doc: update NEWS

ntp: restrict authentication of server/peer to specified key
When a server/peer was specified with a key number to enable authentication with a symmetric key, packets received from the server/peer were accepted if they were authenticated with any of the keys contained in the key file and not just the specified key. This allowed an attacker who knew one key of a client/peer to modify packets from its servers/peers that were authenticated with other keys in a man-in-the-middle (MITM) attack. For example, in a network where each NTP association had a separate key and all hosts had only keys they needed, a client of a server could not attack other clients of the server, but it could attack the server and also attack its own clients (i.e. modify packets from other servers). To not allow the server/peer to be authenticated with other keys extend the authentication test to check if the key ID in the received packet is equal to the configured key number. As a consequence, it's no longer possible to authenticate two peers to each other with two different keys, both peers have to be configured to use the same key. This issue was discovered by Matt Street of Cisco ASIG.
2025-12-04 10:45:07 -05:00 · 2016-01-19 08:15:15 +01:00 · 2016-01-19 08:15:12 +01:00 · 2016-01-19 08:14:46 +01:00 · 2015-04-08 08:47:13 +02:00 · 2015-04-07 16:35:16 +02:00
234 changed files with 20522 additions and 28005 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -1,28 +1,21 @@
 .deps
 .vimrc
 *.gcda
 *.gcno
 *.o
 *.swp
-*.dSYM
+RELEASES
-*.DS_Store
+Makefile
-core.*
+chrony.conf.5
 chrony.info
 chrony.html
 chrony.texi
 chrony.txt
 chronyc
 chronyc.1
 chronyd
 chronyd.8
 config.h
 config.log
 tags
-/RELEASES
+version.h
 /Makefile
 /chronyc
 /chronyd
 /config.h
 /config.log
 /doc/Makefile
 /doc/*.html
 /doc/*.man
 /doc/*.man.in
 /doc/*.txt
 /getdate.c
 /version.h
 /test/simulation/clknetsim
 /test/simulation/tmp
 /test/unit/Makefile
 /test/unit/*.test
 /test/unit/*.o
--- a/Makefile.in
+++ b/Makefile.in
@@ -24,6 +24,9 @@
 SYSCONFDIR=@SYSCONFDIR@
 BINDIR=@BINDIR@
 SBINDIR=@SBINDIR@
 MANDIR=@MANDIR@
 INFODIR=@INFODIR@
 DOCDIR=@DOCDIR@
 LOCALSTATEDIR=@LOCALSTATEDIR@
 CHRONYVARDIR=@CHRONYVARDIR@
@@ -35,13 +38,18 @@ DESTDIR=
 HASH_OBJ = @HASH_OBJ@
-OBJS = array.o cmdparse.o conf.o local.o logging.o main.o memory.o \
+OBJS = util.o sched.o regress.o local.o \
-       reference.o regress.o rtc.o samplefilt.o sched.o sources.o sourcestats.o stubs.o \
+	sys.o main.o ntp_io.o ntp_core.o ntp_sources.o \
-       smooth.o sys.o sys_null.o tempcomp.o util.o $(HASH_OBJ)
+	sources.o sourcestats.o reference.o \
 	logging.o conf.o cmdmon.o keys.o \
 	nameserv.o nameserv_async.o manual.o addrfilt.o \
 	cmdparse.o mkdirpp.o rtc.o pktlength.o clientlog.o \
 	broadcast.o refclock.o refclock_phc.o refclock_pps.o \
 	refclock_shm.o refclock_sock.o tempcomp.o $(HASH_OBJ)
 EXTRA_OBJS=@EXTRA_OBJECTS@
-CLI_OBJS = array.o client.o cmdparse.o getdate.o memory.o nameserv.o \
+CLI_OBJS = client.o nameserv.o getdate.o cmdparse.o \
           pktlength.o util.o $(HASH_OBJ)
 ALL_OBJS = $(OBJS) $(EXTRA_OBJS) $(CLI_OBJS)
@@ -63,19 +71,21 @@ chronyd : $(OBJS) $(EXTRA_OBJS)
 chronyc : $(CLI_OBJS)
 	$(CC) $(CFLAGS) -o chronyc $(CLI_OBJS) $(LDFLAGS) $(LIBS) $(EXTRA_CLI_LIBS)
 client.o : client.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) @READLINE_COMPILE@ -c $<
 $(HASH_OBJ) : $(patsubst %.o,%.c,$(HASH_OBJ))
 	$(CC) $(CFLAGS) $(CPPFLAGS) @HASH_COMPILE@ -c $<
 distclean : clean
-	$(MAKE) -C doc distclean
+	-rm -f Makefile
-	$(MAKE) -C test/unit distclean
+	-rm -f chrony.conf.5 chrony.texi chronyc.1 chronyd.8
 	-rm -f .DS_Store
 	-rm -f Makefile config.h config.log
 clean :
-	-rm -f *.o *.s chronyc chronyd core.* *~
+	-rm -f *.o *.s chronyc chronyd core *~ chrony.info chrony.html chrony.txt
 	-rm -f *.gcda *.gcno
 	-rm -rf .deps
 	-rm -rf *.dSYM
-getdate.c : getdate.y
+getdate.c :
 	bison -o getdate.c getdate.y
 # This can be used to force regeneration of getdate.c
@@ -85,10 +95,15 @@ getdate :
 # For install, don't use the install command, because its switches
 # seem to vary between systems.
-install: chronyd chronyc
+install: chronyd chronyc chrony.txt
 	[ -d $(DESTDIR)$(SYSCONFDIR) ] || mkdir -p $(DESTDIR)$(SYSCONFDIR)
 	[ -d $(DESTDIR)$(SBINDIR) ] || mkdir -p $(DESTDIR)$(SBINDIR)
 	[ -d $(DESTDIR)$(BINDIR) ] || mkdir -p $(DESTDIR)$(BINDIR)
 	[ -d $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
 	[ -d $(DESTDIR)$(MANDIR)/man1 ] || mkdir -p $(DESTDIR)$(MANDIR)/man1
 	[ -d $(DESTDIR)$(MANDIR)/man5 ] || mkdir -p $(DESTDIR)$(MANDIR)/man5
 	[ -d $(DESTDIR)$(MANDIR)/man8 ] || mkdir -p $(DESTDIR)$(MANDIR)/man8
 	[ -d $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
 	[ -d $(DESTDIR)$(CHRONYVARDIR) ] || mkdir -p $(DESTDIR)$(CHRONYVARDIR)
 	if [ -f $(DESTDIR)$(SBINDIR)/chronyd ]; then rm -f $(DESTDIR)$(SBINDIR)/chronyd ; fi
 	if [ -f $(DESTDIR)$(BINDIR)/chronyc ]; then rm -f $(DESTDIR)$(BINDIR)/chronyc ; fi
@@ -96,13 +111,20 @@ install: chronyd chronyc
 	chmod 755 $(DESTDIR)$(SBINDIR)/chronyd
 	cp chronyc $(DESTDIR)$(BINDIR)/chronyc
 	chmod 755 $(DESTDIR)$(BINDIR)/chronyc
-	$(MAKE) -C doc install
+	cp chrony.txt $(DESTDIR)$(DOCDIR)/chrony.txt
-
+	chmod 644 $(DESTDIR)$(DOCDIR)/chrony.txt
-docs :
+	cp COPYING $(DESTDIR)$(DOCDIR)/COPYING
-	$(MAKE) -C doc docs
+	chmod 644 $(DESTDIR)$(DOCDIR)/COPYING
-
+	cp README $(DESTDIR)$(DOCDIR)/README
-install-docs :
+	chmod 644 $(DESTDIR)$(DOCDIR)/README
-	$(MAKE) -C doc install-docs
+	cp chrony.1 $(DESTDIR)$(MANDIR)/man1
 	chmod 644 $(DESTDIR)$(MANDIR)/man1/chrony.1
 	cp chronyc.1 $(DESTDIR)$(MANDIR)/man1
 	chmod 644 $(DESTDIR)$(MANDIR)/man1/chronyc.1
 	cp chronyd.8 $(DESTDIR)$(MANDIR)/man8
 	chmod 644 $(DESTDIR)$(MANDIR)/man8/chronyd.8
 	cp chrony.conf.5 $(DESTDIR)$(MANDIR)/man5
 	chmod 644 $(DESTDIR)$(MANDIR)/man5/chrony.conf.5
 %.o : %.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
@@ -110,24 +132,30 @@ install-docs :
 %.s : %.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -S $<
 quickcheck : chronyd chronyc
 	$(MAKE) -C test/unit check
 	cd test/simulation && ./run
 	cd test/system && ./run
 check : chronyd chronyc
-	$(MAKE) -C test/unit check
+	cd test/simulation && ./run
 	cd test/simulation && ./run -i 20 -m 2
 	cd test/system && ./run
-print-chronyd-objects :
+install-docs : docs
-	@echo $(OBJS) $(EXTRA_OBJS)
+	[ -d $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
 	cp chrony.txt $(DESTDIR)$(DOCDIR)/chrony.txt
 	chmod 644 $(DESTDIR)$(DOCDIR)/chrony.txt
 	cp chrony.html $(DESTDIR)$(DOCDIR)/chrony.html
 	chmod 644 $(DESTDIR)$(DOCDIR)/chrony.html
 	[ -d $(DESTDIR)$(INFODIR) ] || mkdir -p $(DESTDIR)$(INFODIR)
 	cp chrony.info* $(DESTDIR)$(INFODIR)
 	chmod 644 $(DESTDIR)$(INFODIR)/chrony.info*
-Makefile : Makefile.in configure
+docs : chrony.txt chrony.html chrony.info
-	@echo
+
-	@echo Makefile needs to be regenerated, run ./configure
+chrony.txt : chrony.texi
-	@echo
+	makeinfo --no-headers --number-sections -o chrony.txt chrony.texi
-	@exit 1
+
 chrony.html : chrony.texi
 	command -v texi2html > /dev/null 2>&1 && texi2html chrony.texi || \
 	  makeinfo --no-split --html --number-sections -o chrony.html chrony.texi
 chrony.info : chrony.texi
 	makeinfo chrony.texi
 .deps:
 	@mkdir .deps
--- a/326
+++ b/326
@@ -1,332 +1,10 @@
-New in version 3.5.1
+New in version 1.31.2
-====================
+=====================
 Security fixes
 --------------
 * Create new file when writing pidfile (CVE-2020-14367)
 New in version 3.5
 ==================
 Enhancements
 ------------
 * Add support for more accurate reading of PHC on Linux 5.0
 * Add support for hardware timestamping on interfaces with read-only
  timestamping configuration
 * Add support for memory locking and real-time priority on FreeBSD,
  NetBSD, Solaris
 * Update seccomp filter to work on more architectures
 * Validate refclock driver options
 Bug fixes
 ---------
 * Fix bindaddress directive on FreeBSD
 * Fix transposition of hardware RX timestamp on Linux 4.13 and later
 * Fix building on non-glibc systems
 New in version 3.4
 ==================
 Enhancements
 ------------
 * Add filter option to server/pool/peer directive
 * Add minsamples and maxsamples options to hwtimestamp directive
 * Add support for faster frequency adjustments in Linux 4.19
 * Change default pidfile to /var/run/chrony/chronyd.pid to allow
  chronyd without root privileges to remove it on exit
 * Disable sub-second polling intervals for distant NTP sources
 * Extend range of supported sub-second polling intervals
 * Get/set IPv4 destination/source address of NTP packets on FreeBSD
 * Make burst options and command useful with short polling intervals
 * Modify auto_offline option to activate when sending request failed
 * Respond from interface that received NTP request if possible
 * Add onoffline command to switch between online and offline state
  according to current system network configuration
 * Improve example NetworkManager dispatcher script
 Bug fixes
 ---------
 * Avoid waiting in Linux getrandom system call
 * Fix PPS support on FreeBSD and NetBSD
 New in version 3.3
 ==================
 Enhancements
 ------------
 * Add burst option to server/pool directive
 * Add stratum and tai options to refclock directive
 * Add support for Nettle crypto library
 * Add workaround for missing kernel receive timestamps on Linux
 * Wait for late hardware transmit timestamps
 * Improve source selection with unreachable sources
 * Improve protection against replay attacks on symmetric mode
 * Allow PHC refclock to use socket in /var/run/chrony
 * Add shutdown command to stop chronyd
 * Simplify format of response to manual list command
 * Improve handling of unknown responses in chronyc
 Bug fixes
 ---------
 * Respond to NTPv1 client requests with zero mode
 * Fix -x option to not require CAP_SYS_TIME under non-root user
 * Fix acquisitionport directive to work with privilege separation
 * Fix handling of socket errors on Linux to avoid high CPU usage
 * Fix chronyc to not get stuck in infinite loop after clock step
 New in version 3.2
 ==================
 Enhancements
 ------------
 * Improve stability with NTP sources and reference clocks
 * Improve stability with hardware timestamping
 * Improve support for NTP interleaved modes
 * Control frequency of system clock on macOS 10.13 and later
 * Set TAI-UTC offset of system clock with leapsectz directive
 * Minimise data in client requests to improve privacy
 * Allow transmit-only hardware timestamping
 * Add support for new timestamping options introduced in Linux 4.13
 * Add root delay, root dispersion and maximum error to tracking log
 * Add mindelay and asymmetry options to server/peer/pool directive
 * Add extpps option to PHC refclock to timestamp external PPS signal
 * Add pps option to refclock directive to treat any refclock as PPS
 * Add width option to refclock directive to filter wrong pulse edges
 * Add rxfilter option to hwtimestamp directive
 * Add -x option to disable control of system clock
 * Add -l option to log to specified file instead of syslog
 * Allow multiple command-line options to be specified together
 * Allow starting without root privileges with -Q option
 * Update seccomp filter for new glibc versions
 * Dump history on exit by default with dumpdir directive
 * Use hardening compiler options by default
 Bug fixes
 ---------
 * Don't drop PHC samples with low-resolution system clock
 * Ignore outliers in PHC tracking, RTC tracking, manual input
 * Increase polling interval when peer is not responding
 * Exit with error message when include directive fails
 * Don't allow slash after hostname in allow/deny directive/command
 * Try to connect to all addresses in chronyc before giving up
 New in version 3.1
 ==================
 Enhancements
 ------------
 * Add support for precise cross timestamping of PHC on Linux
 * Add minpoll, precision, nocrossts options to hwtimestamp directive
 * Add rawmeasurements option to log directive and modify measurements
  option to log only valid measurements from synchronised sources
 * Allow sub-second polling interval with NTP sources
 Bug fixes
 ---------
 * Fix time smoothing in interleaved mode
 New in version 3.0
 ==================
 Enhancements
 ------------
 * Add support for software and hardware timestamping on Linux
 * Add support for client/server and symmetric interleaved modes
 * Add support for MS-SNTP authentication in Samba
 * Add support for truncated MACs in NTPv4 packets
 * Estimate and correct for asymmetric network jitter
 * Increase default minsamples and polltarget to improve stability
  with very low jitter
 * Add maxjitter directive to limit source selection by jitter
 * Add offset option to server/pool/peer directive
 * Add maxlockage option to refclock directive
 * Add -t option to chronyd to exit after specified time
 * Add partial protection against replay attacks on symmetric mode
 * Don't reset polling interval when switching sources to online state
 * Allow rate limiting with very short intervals
 * Improve maximum server throughput on Linux and NetBSD
 * Remove dump files after start
 * Add tab-completion to chronyc with libedit/readline
 * Add ntpdata command to print details about NTP measurements
 * Allow all source options to be set in add server/peer command
 * Indicate truncated addresses/hostnames in chronyc output
 * Print reference IDs as hexadecimal numbers to avoid confusion with
  IPv4 addresses
 Bug fixes
 ---------
 * Fix crash with disabled asynchronous name resolving
 New in version 2.4.1
 ====================
 Bug fixes
 ---------
 * Fix processing of kernel timestamps on non-Linux systems
 * Fix crash with smoothtime directive
 * Fix validation of refclock sample times
 * Fix parsing of refclock directive
 New in version 2.4
 ==================
 Enhancements
 ------------
 * Add orphan option to local directive for orphan mode compatible with ntpd
 * Add distance option to local directive to set activation threshold
  (1 second by default)
 * Add maxdrift directive to set maximum allowed drift of system clock
 * Try to replace NTP sources exceeding maximum distance
 * Randomise source replacement to avoid getting stuck with bad sources
 * Randomise selection of sources from pools on start
 * Ignore reference timestamp as ntpd doesn't always set it correctly
 * Modify tracking report to use same values as seen by NTP clients
 * Add -c option to chronyc to write reports in CSV format
 * Provide detailed manual pages
 Bug fixes
 ---------
 * Fix SOCK refclock to work correctly when not specified as last refclock
 * Fix initstepslew and -q/-Q options to accept time from own NTP clients
 * Fix authentication with keys using 512-bit hash functions
 * Fix crash on exit when multiple signals are received
 * Fix conversion of very small floating-point numbers in command packets
 Removed features
 ----------------
 * Drop documentation in Texinfo format
 New in version 2.3
 ==================
 Enhancements
 ------------
 * Add support for NTP and command response rate limiting
 * Add support for dropping root privileges on Mac OS X, FreeBSD, Solaris
 * Add require and trust options for source selection
 * Enable logchange by default (1 second threshold)
 * Set RTC on Mac OS X with rtcsync directive
 * Allow binding to NTP port after dropping root privileges on NetBSD
 * Drop CAP_NET_BIND_SERVICE capability on Linux when NTP port is disabled
 * Resolve names in separate process when seccomp filter is enabled
 * Replace old records in client log when memory limit is reached
 * Don't reveal local time and synchronisation state in client packets
 * Don't keep client sockets open for longer than necessary
 * Ignore poll in KoD RATE packets as ntpd doesn't always set it correctly
 * Warn when using keys shorter than 80 bits
 * Add keygen command to generate random keys easily
 * Add serverstats command to report NTP and command packet statistics
 Bug fixes
 ---------
 * Fix clock correction after making step on Mac OS X
 * Fix building on Solaris
 New in version 2.2.1
 ====================
 Security fixes
 --------------
 * Restrict authentication of NTP server/peer to specified key (CVE-2016-1567)
 New in version 2.2
 ==================
 Enhancements
 ------------
 * Add support for configuration and monitoring over Unix domain socket
  (accessible by root or chrony user when root privileges are dropped)
 * Add support for system call filtering with seccomp on Linux (experimental)
 * Add support for dropping root privileges on NetBSD
 * Control frequency of system clock on FreeBSD, NetBSD, Solaris
 * Add system leap second handling mode on FreeBSD, NetBSD, Solaris
 * Add dynamic drift removal on Mac OS X
 * Add support for setting real-time priority on Mac OS X
 * Add maxdistance directive to limit source selection by root distance
  (3 seconds by default)
 * Add refresh command to get new addresses of NTP sources
 * Allow wildcard patterns in include directive
 * Restore time from driftfile with -s option if later than RTC time
 * Add configure option to set default hwclockfile
 * Add -d option to chronyc to enable debug messages
 * Allow multiple addresses to be specified for chronyc with -h option
  and reconnect when no valid reply is received
 * Make check interval in waitsync command configurable
 Bug fixes
 ---------
 * Fix building on NetBSD, Solaris
 * Restore time from driftfile with -s option if reading RTC failed
 Removed features
 ----------------
 * Drop support for authentication with command key (run-time configuration
  is now allowed only for local users that can access the Unix domain socket)
 New in version 2.1.1
 ====================
 Bug fixes
 ---------
 * Fix clock stepping by integer number of seconds on Linux
 New in version 2.1
 ==================
 Enhancements
 ------------
 * Add support for Mac OS X
 * Try to replace unreachable and falseticker servers/peers specified
  by name like pool sources
 * Add leaponly option to smoothtime directive to allow synchronised
  leap smear between multiple servers
 * Use specific reference ID when smoothing served time
 * Add smoothing command to report time smoothing status
 * Add smoothtime command to activate or reset time smoothing
 Bug fixes
 ---------
 * Fix crash in source selection with preferred sources
 * Fix resetting of time smoothing
 * Include packet precision in peer dispersion
 * Fix crash in chronyc on invalid command syntax
 New in version 2.0
 ==================
 Enhancements
 ------------
 * Update to NTP version 4 (RFC 5905)
 * Add pool directive to specify pool of NTP servers
 * Add leapsecmode directive to select how to correct clock for leap second
 * Add smoothtime directive to smooth served time and enable leap smear
 * Add minsources directive to set required number of selectable sources
 * Add minsamples and maxsamples options for all sources
 * Add tempcomp configuration with list of points
 * Allow unlimited number of NTP sources, refclocks and keys
 * Allow unreachable sources to remain selected
 * Improve source selection
 * Handle offline sources as unreachable
 * Open NTP server port only when necessary (client access is allowed by
  allow directive/command or peer/broadcast is configured)
 * Change default bindcmdaddress to loopback address
 * Change default maxdelay to 3 seconds
 * Change default stratumweight to 0.001
 * Update adjtimex synchronisation status
 * Use system headers for adjtimex
 * Check for memory allocation errors
 * Reduce memory usage
 * Add configure options to compile without NTP, cmdmon, refclock support
 * Extend makestep command to set automatic clock stepping
 Bug fixes
 ---------
 * Add sanity checks for time and frequency offset
 * Don't report synchronised status during leap second
 * Don't combine reference clocks with close NTP sources
 * Fix accepting requests from configured sources
 * Fix initial fallback drift setting
 New in version 1.31.1
 =====================
--- a/280
+++ b/280
@@ -3,53 +3,88 @@ This is the README for chrony.
 What is chrony?
 ===============
-chrony is a versatile implementation of the Network Time Protocol (NTP).
+Chrony is a pair of programs for maintaining the accuracy of computer
-It can synchronise the system clock with NTP servers, reference clocks
+clocks.
 (e.g. GPS receiver), and manual input using wristwatch and keyboard.
 It can also operate as an NTPv4 (RFC 5905) server and peer to provide
 a time service to other computers in the network.
-It is designed to perform well in a wide range of conditions, including
+chronyd is a (background) daemon program that can be started at boot
-intermittent network connections, heavily congested networks, changing
+time.  This does most of the work.
 temperatures (ordinary computer clocks are sensitive to temperature),
 and systems that do not run continuosly, or run on a virtual machine.
-Typical accuracy between two machines synchronised over the Internet is
+chronyc is a command-line interface program which can be used to
-within a few milliseconds; on a LAN, accuracy is typically in tens of
+monitor chronyd's performance and to change various operating
-microseconds.  With hardware timestamping, or a hardware reference clock,
+parameters whilst it is running.
-sub-microsecond accuracy may be possible.
+
 chronyd's main function is to obtain measurements of the true (UTC)
 time from one of several sources, and correct the system clock
 accordingly.  It also works out the rate at which the system clock
 gains or loses time and uses this information to keep it accurate
 between measurements from the reference.
 The reference time can be derived from Network Time Protocol (NTP)
 servers, reference clocks, or wristwatch-and-keyboard (via chronyc).
 The main source of information about the Network Time Protocol is
 http://www.ntp.org.
 It is designed so that it can work on computers which only have
 intermittent access to reference sources, for example computers which
 use a dial-up account to access the Internet or laptops.  Of course, it
 will work well on computers with permanent connections too.
 In addition, on Linux it can monitor the system's real time clock
 performance, so the system can maintain accurate time even across
 reboots.
 Typical accuracies available between 2 machines are
 On an ethernet LAN : 100-200 microseconds, often much better
 On a V32bis dial-up modem connection : 10's of milliseconds (from one
 session to the next)
 With a good reference clock the accuracy can reach one microsecond.
 chronyd can also operate as an RFC1305-compatible NTP server and peer.
 Two programs are included in chrony, chronyd is a daemon that can be
 started at boot time and chronyc is a command-line interface program
 which can be used to monitor chronyd's performance and to change various
 operating parameters whilst it is running.
 What will chrony run on?
 ========================
-The software is known to work on Linux, FreeBSD, NetBSD, macOS and
+Chrony can be successfully built and run on
-Solaris.  Closely related systems may work too.  Any other system will
+
-likely require a porting exercise.  You would need to start from one
+1. Linux 2.2.x, 2.3.x, 2.4.x, 2.6.x, 3.x
-of the existing system-specific drivers and look into the quirks of
+
-certain system calls and the kernel on your target system.
+2. Solaris 2.5/2.5.1/2.6/2.7/2.8 (various platforms) 
 3. SunOS 4.1.4 (Sparc 2 and Sparc 20)
 4. BSD/386 v1.1 has been reported to work using the SunOS 4.1 driver.
 5. NetBSD.
 Any other system will require a porting exercise.  You would need to
 start from one of the existing system-specific drivers and look into
 the quirks of certain system calls and the kernel on your target
 system.
 How do I set it up?
 ===================
 The file INSTALL gives instructions.  On supported systems the
-compilation process should be automatic.  You will need a C compiler,
+compilation process should be automatic.
-e.g. gcc or clang.
+
 You will need an ANSI C compiler -- gcc is recommended.
 The manual (in texinfo and text formats) describes how to set the
 software up for the less straightforward cases.
 What documentation is there?
 ============================
-The distribution includes manual pages and a document containing
+A manual is supplied in Texinfo format (chrony.texi) and
-Frequently Asked Questions (FAQ).
+ready-formatted plain text (chrony.txt) in the distribution.
-The documentation is also available on the chrony web pages, accessible
+There is also information available on the chrony web pages, accessible
 through the URL 
-    https://chrony.tuxfamily.org/
+    http://chrony.tuxfamily.org/
 Where are new versions announced?
 =================================
@@ -80,85 +115,136 @@ chrony-dev-request@chrony.tuxfamily.org
 as applicable.
 When you are reporting a bug, please send us all the information you can.
 Unfortunately, chrony has proven to be one of those programs where it is very
 difficult to reproduce bugs in a different environment. So we may have to
 interact with you quite a lot to obtain enough extra logging and tracing to
 pin-point the problem in some cases. Please be patient and plan for this!
-License
+Author
-=======
+======
 chrony is distributed under the GNU General Public License version 2.
 Authors
 =======
 Richard P. Curnow <rc@rc0.org.uk>
 Maintainers
 ===========
 Miroslav Lichvar <mlichvar@redhat.com>
 Acknowledgements
 ================
 In writing the chronyd program, extensive use has been made of RFC 1305
 and RFC 5905, written by David Mills. The source code of the NTP reference
 implementation has been used to check the details of the protocol.
 The following people have provided patches and other major contributions
 to the program :
 Lonnie Abelbeck <lonnie@abelbeck.com>
 Benny Lyne Amorsen <benny@amorsen.dk>
-Andrew Bishop <amb@gedanken.demon.co.uk>
+    Patch to add minstratum option
 Vincent Blut <vincent.debian@free.fr>
 Stephan I. Boettcher <stephan@nevis1.columbia.edu>
 Goswin Brederlow <brederlo@informatik.uni-tuebingen.de>
 Leigh Brown <leigh@solinno.co.uk>
 Erik Bryer <ebryer@spots.ab.ca>
 Jonathan Cameron <jic23@cam.ac.uk>
 Bryan Christianson <bryan@whatroute.net>
 Juliusz Chroboczek <jch@pps.jussieu.fr>
 Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Paul Elliott <pelliott@io.com>
 Stefan R. Filipek <srfilipek@gmail.com>
 Mike Fleetwood <mike@rockover.demon.co.uk>
 Alexander Gretencord <arutha@gmx.de>
 Andrew Griffiths <agriffit@redhat.com>
 Walter Haidinger <walter.haidinger@gmx.at>
 Juergen Hannken-Illjes <hannken@eis.cs.tu-bs.de>
 John Hasler <john@dhh.gt.org>
 Tjalling Hattink <t.hattink@fugro.nl>
 Liam Hatton <me@liamhatton.com>
 Jachym Holecek <jakym@volny.cz>
 Håkan Johansson <f96hajo@chalmers.se>
 Jim Knoble <jmknoble@pobox.com>
 Antti Jrvinen <costello@iki.fi>
 Eric Lammerts <eric@lammerts.org>
 Stefan Lucke <stefan@lucke.in-berlin.de>
 Victor Lum <viclum@vanu.com>
 Kevin Lyda <kevin@ie.suberic.net>
 Paul Menzel <paulepanter@users.sourceforge.net>
 Vladimir Michl <vladimir.michl@seznam.cz>
 Victor Moroz <vim@prv.adlum.ru>
 Kalle Olavi Niemitalo  <tosi@stekt.oulu.fi>
 Frank Otto <sandwichmacher@web.de>
 Denny Page <dennypage@me.com>
 Chris Perl <cperl@janestreet.com>
 Gautier PHILIPPON <gautier.philippon@ensimag.grenoble-inp.fr>
 Andreas Piesk <apiesk@virbus.de>
 Andreas Steinmetz <ast@domdv.de>
 NAKAMURA Takumi <takumi@ps.sakura.ne.jp>
 Timo Teras <timo.teras@iki.fi>
 Bill Unruh <unruh@physics.ubc.ca>
 Stephen Wadeley <swadeley@redhat.com>
 Bernhard Weiss <lisnablagh@web.de>
 Wolfgang Weisselberg <weissel@netcologne.de>
 Bernhard M. Wiedemann <bwiedemann@suse.de>
 Joachim Wiedorn <ad_debian@joonet.de>
 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
 Ulrich Windl <ulrich.windl@rz.uni-regensburg.de>
 Doug Woodward <dougw@whistler.com>
 Thomas Zajic <zlatko@zlatko.fdns.net>
-Many other people have contributed bug reports and suggestions.  We are sorry
+Andrew Bishop <amb@gedanken.demon.co.uk>
-we cannot identify all of you individually.
+    Fixes for bugs in logging when in daemon mode
    Fixes for compiler warnings
    Robustness improvements for drift file
    Improve installation (directory checking etc)
    Entries in contrib directory
    Improvements to 'sources' and 'sourcestats' output from chronyc
    Improvements to documentation
    Investigation of required dosynctodr behaviour for various Solaris
      versions.
 Stephan I. Boettcher <stephan@nevis1.columbia.edu>
    Entries in contrib directory
 Erik Bryer <ebryer@spots.ab.ca>
    Entries in contrib directory
 Juliusz Chroboczek <jch@pps.jussieu.fr>
    Fix install rule in Makefile if chronyd file is in use.
 Paul Elliott <pelliott@io.com>
    DNSchrony (in contrib directory), a tool for handling NTP servers
    with variable IP addresses.
 Mike Fleetwood <mike@rockover.demon.co.uk>
    Fixes for compiler warnings
 Alexander Gretencord <arutha@gmx.de>
    Changes to installation directory system to make it easier for
    package builders.
 Walter Haidinger <walter.haidinger@gmx.at>
    Providing me with login access to a Linux installation where v1.12
    wouldn't compile, so I could develop the fixes for v1.13.  Also, for
    providing the disc space so I can keep an independent backup of the
    sources.
 Juergen Hannken-Illjes <hannken@eis.cs.tu-bs.de>
    Port to NetBSD
 John Hasler <john@dhh.gt.org>
    Project and website at tuxfamily.org
    Changes to support 64 bit machines (i.e. those where
      sizeof(unsigned long) > 4)
    Bug fix to initstepslew directive
    Fix to remove potential buffer overrun errors.
    Memory locking and real-time scheduler support
    Fix fault where chronyd enters an endless loop
 Tjalling Hattink <t.hattink@fugro.nl>
    Fix scheduler to allow stepping clock from timeout handler
    Patch to take leap second in PPS refclock from locked source
    Patch to make reading of RTC for initial trim more reliable
 Liam Hatton <me@liamhatton.com>
    Advice on configuring for Linux on PPC
 Jachym Holecek <jakym@volny.cz>
    Patch to make Linux real time clock work with devfs
 Håkan Johansson <f96hajo@chalmers.se>
    Patch to avoid large values in sources and sourcestats output
 Jim Knoble <jmknoble@pobox.com>
    Fixes for compiler warnings
 Antti Jrvinen <costello@iki.fi>
    Advice on configuring for BSD/386
 Miroslav Lichvar <mlichvar@redhat.com>
    Reference clock support
    IPv6 support
    Linux capabilities support
    Leap second support
    Improved source selection
    Improved sample history trimming
    Improved polling interval adjustment
    Improved stability with temporary asymmetric delays
    Temperature compensation
    Many other bug fixes and improvements
 Victor Moroz <vim@prv.adlum.ru>
    Patch to support Linux with HZ!=100
 Kalle Olavi Niemitalo  <tosi@stekt.oulu.fi>
    acquisitionport support
 Frank Otto <sandwichmacher@web.de>
    Handling arbitrary HZ values
 Andreas Piesk <apiesk@virbus.de>
    Patch to make chronyc use the readline library if available
 Timo Teras <timo.teras@iki.fi>
    Patch to reply correctly on multihomed hosts
 Wolfgang Weisselberg <weissel@netcologne.de>
    Entries in contrib directory
 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
    Many robustness and security improvements
 Ulrich Windl <ulrich.windl@rz.uni-regensburg.de> for the
    Providing me with information about the Linux 2.2 kernel
    functionality compared to 2.0.
 Doug Woodward <dougw@whistler.com>
    Advice on configuring for Solaris 2.8 on x86
 Many other people have contributed bug reports and suggestions.  I'm
 sorry I can't identify all of you individually.
--- a/addressing.h
+++ b/addressing.h
@@ -42,7 +42,6 @@ typedef struct {
    uint8_t in6[16];
  } addr;
  uint16_t family;
  uint16_t _pad;
 } IPAddr;
 typedef struct {
@@ -50,11 +49,8 @@ typedef struct {
  unsigned short port;
 } NTP_Remote_Address;
 #define INVALID_IF_INDEX -1
 typedef struct {
  IPAddr ip_addr;
  int if_index;
  int sock_fd;
 } NTP_Local_Address;
--- a/addrfilt.c
+++ b/addrfilt.c
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997,1998,1999,2000,2001,2002,2005
- * Copyright (C) Miroslav Lichvar  2009, 2015
+ * Copyright (C) Miroslav Lichvar  2009
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -62,7 +62,7 @@ split_ip6(IPAddr *ip, uint32_t *dst)
  int i;
  for (i = 0; i < 4; i++)
-    dst[i] = (uint32_t)ip->addr.in6[i * 4 + 0] << 24 |
+    dst[i] = ip->addr.in6[i * 4 + 0] << 24 |
             ip->addr.in6[i * 4 + 1] << 16 |
             ip->addr.in6[i * 4 + 2] << 8 |
             ip->addr.in6[i * 4 + 3];
@@ -366,38 +366,114 @@ ADF_IsAllowed(ADF_AuthTable table,
 /* ================================================== */
-static int
+#if defined TEST
-is_any_allowed(TableNode *node, State parent)
+
 static void print_node(TableNode *node, uint32_t *addr, int ip_len, int shift, int subnet_bits)
 {
-  State state;
+  uint32_t new_addr[4];
  int i;
  TableNode *sub_node;
-  state = node->state != AS_PARENT ? node->state : parent;
+  for (i=0; i<subnet_bits; i++) putchar(' ');
  assert(state != AS_PARENT);
  if (ip_len == 1)
      printf("%d.%d.%d.%d",
          ((addr[0] >> 24) & 255),
          ((addr[0] >> 16) & 255),
          ((addr[0] >>  8) & 255),
          ((addr[0]      ) & 255));
  else {
    for (i=0; i<4; i++) {
      if (addr[i])
        printf("%d.%d.%d.%d",
            ((addr[i] >> 24) & 255),
            ((addr[i] >> 16) & 255),
            ((addr[i] >>  8) & 255),
            ((addr[i]      ) & 255));
      putchar(i < 3 ? ':' : '\0');
    }
  }
  printf("/%d : %s\n",
         subnet_bits,
         (node->state == ALLOW) ? "allow" :
         (node->state == DENY)  ? "deny" : "as parent");
  if (node->extended) {
-    for (i = 0; i < TABLE_SIZE; i++) {
+    for (i=0; i<16; i++) {
-      if (is_any_allowed(&node->extended[i], state))
+      sub_node = &(node->extended[i]);
-        return 1;
+      new_addr[0] = addr[0];
      new_addr[1] = addr[1];
      new_addr[2] = addr[2];
      new_addr[3] = addr[3];
      new_addr[ip_len - 1 - shift / 32] |= ((uint32_t)i << (shift % 32));
      print_node(sub_node, new_addr, ip_len, shift - 4, subnet_bits + 4);
    }
  } else if (state == ALLOW) {
    return 1;
  }
 }
-  return 0;
+
 static void print_table(ADF_AuthTable table)
 {
  uint32_t addr[4];
  memset(addr, 0, sizeof (addr));
  printf("IPv4 table:\n");
  print_node(&table->base4, addr, 1, 28, 0);
  memset(addr, 0, sizeof (addr));
  printf("IPv6 table:\n");
  print_node(&table->base6, addr, 4, 124, 0);
 }
 /* ================================================== */
-int
+int main (int argc, char **argv)
 ADF_IsAnyAllowed(ADF_AuthTable table, int family)
 {
-  switch (family) {
+  IPAddr ip;
-    case IPADDR_INET4:
+  ADF_AuthTable table;
-      return is_any_allowed(&table->base4, AS_PARENT);
+  table = ADF_CreateTable();
-    case IPADDR_INET6:
+
-      return is_any_allowed(&table->base6, AS_PARENT);
+  ip.family = IPADDR_INET4;
-    default:
+
  ip.addr.in4 = 0x7e800000;
  ADF_Allow(table, &ip, 9);
  ip.addr.in4 = 0x7ecc0000;
  ADF_Deny(table, &ip, 14);
 #if 0
  ip.addr.in4 = 0x7f000001;
  ADF_Deny(table, &ip, 32);
  ip.addr.in4 = 0x7f000000;
  ADF_Allow(table, &ip, 8);
 #endif
  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
  ip.addr.in4 ^= 1;
  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
  ip.family = IPADDR_INET6;
  memcpy(ip.addr.in6, "abcdefghijklmnop", 16);
  ADF_Deny(table, &ip, 66);
  ADF_Allow(table, &ip, 59);
  memcpy(ip.addr.in6, "xbcdefghijklmnop", 16);
  ADF_Deny(table, &ip, 128);
  ip.addr.in6[15] ^= 3;
  ADF_Allow(table, &ip, 127);
  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
  ip.addr.in4 ^= 1;
  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
  print_table(table);
  ADF_DestroyTable(table);
  return 0;
  }
 }
 #endif /* defined TEST */
--- a/addrfilt.h
+++ b/addrfilt.h
@@ -72,9 +72,4 @@ extern void ADF_DestroyTable(ADF_AuthTable table);
 extern int ADF_IsAllowed(ADF_AuthTable table,
                         IPAddr *ip);
 /* Check if at least one address from a given family is allowed by
   the rules in the table */
 extern int ADF_IsAnyAllowed(ADF_AuthTable table,
                            int family);
 #endif /* GOT_ADDRFILT_H */
--- a/array.c
+++ b/array.c
@@ -1,130 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Functions implementing an array with automatic memory allocation.
  */
 #include "config.h"
 #include "sysincl.h"
 #include "array.h"
 #include "memory.h"
 struct ARR_Instance_Record {
  void *data;
  unsigned int elem_size;
  unsigned int used;
  unsigned int allocated;
 };
 ARR_Instance
 ARR_CreateInstance(unsigned int elem_size)
 {
  ARR_Instance array;
  assert(elem_size > 0);
  array = MallocNew(struct ARR_Instance_Record);
  array->data = NULL;
  array->elem_size = elem_size;
  array->used = 0;
  array->allocated = 0;
  return array;
 }
 void
 ARR_DestroyInstance(ARR_Instance array)
 {
  Free(array->data);
  Free(array);
 }
 static void
 realloc_array(ARR_Instance array, unsigned int min_size)
 {
  assert(min_size <= 2 * min_size);
  if (array->allocated >= min_size && array->allocated <= 2 * min_size)
    return;
  if (array->allocated < min_size) {
    while (array->allocated < min_size)
      array->allocated = array->allocated ? 2 * array->allocated : 1;
  } else {
    array->allocated = min_size;
  }
  array->data = Realloc2(array->data, array->allocated, array->elem_size);
 }
 void *
 ARR_GetNewElement(ARR_Instance array)
 {
  array->used++;
  realloc_array(array, array->used);
  return ARR_GetElement(array, array->used - 1);
 }
 void *
 ARR_GetElement(ARR_Instance array, unsigned int index)
 {
  assert(index < array->used);
  return (void *)((char *)array->data + (size_t)index * array->elem_size);
 }
 void *
 ARR_GetElements(ARR_Instance array)
 {
  /* Return a non-NULL pointer when the array has zero size */
  if (!array->data) {
    assert(!array->used);
    return array;
  }
  return array->data;
 }
 void
 ARR_AppendElement(ARR_Instance array, void *element)
 {
  void *e;
  e = ARR_GetNewElement(array);
  memcpy(e, element, array->elem_size);
 }
 void
 ARR_SetSize(ARR_Instance array, unsigned int size)
 {
  realloc_array(array, size);
  array->used = size;
 }
 unsigned int
 ARR_GetSize(ARR_Instance array)
 {
  return array->used;
 }
--- a/array.h
+++ b/array.h
@@ -1,56 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Header file for array functions.
  */
 #ifndef GOT_ARRAY_H
 #define GOT_ARRAY_H
 typedef struct ARR_Instance_Record *ARR_Instance;
 /* Create a new array with given element size */
 extern ARR_Instance ARR_CreateInstance(unsigned int elem_size);
 /* Destroy the array */
 extern void ARR_DestroyInstance(ARR_Instance array);
 /* Return pointer to a new element added to the end of the array */
 extern void *ARR_GetNewElement(ARR_Instance array);
 /* Return element with given index */
 extern void *ARR_GetElement(ARR_Instance array, unsigned int index);
 /* Return pointer to the internal array of elements */
 extern void *ARR_GetElements(ARR_Instance array);
 /* Add a new element to the end of the array */
 extern void ARR_AppendElement(ARR_Instance array, void *element);
 /* Set the size of the array */
 extern void ARR_SetSize(ARR_Instance array, unsigned int size);
 /* Return current size of the array */
 extern unsigned int ARR_GetSize(ARR_Instance array);
 #endif
--- a/broadcast.c
+++ b/broadcast.c
@@ -0,0 +1,159 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2002
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Deal with broadcast server functions.
  */
 #include "config.h"
 #include "sysincl.h"
 #include "memory.h"
 #include "addressing.h"
 #include "broadcast.h"
 #include "sched.h"
 #include "ntp.h"
 #include "local.h"
 #include "reference.h"
 #include "util.h"
 #include "ntp_io.h"
 typedef struct {
  NTP_Remote_Address addr;
  NTP_Local_Address local_addr;
  int interval;
 } Destination;
 static Destination *destinations = 0;
 static int n_destinations = 0;
 static int max_destinations = 0;
 void
 BRD_Initialise(void)
 {
 }
 /* ================================================== */
 void
 BRD_Finalise(void)
 {
 }
 /* ================================================== */
 /* This is a cut-down version of what transmit_packet in ntp_core.c does */
 static void
 timeout_handler(void *arbitrary)
 {
  Destination *d = (Destination *) arbitrary;
  NTP_Packet message;
  /* Parameters read from reference module */
  int version;
  int leap;
  int are_we_synchronised, our_stratum;
  NTP_Leap leap_status;
  uint32_t our_ref_id, ts_fuzz;
  struct timeval our_ref_time;
  double our_root_delay, our_root_dispersion;
  struct timeval local_transmit;
  version = 3;
  LCL_ReadCookedTime(&local_transmit, NULL);
  REF_GetReferenceParams(&local_transmit,
                         &are_we_synchronised, &leap_status,
                         &our_stratum,
                         &our_ref_id, &our_ref_time,
                         &our_root_delay, &our_root_dispersion);
  if (are_we_synchronised) {
    leap = (int) leap_status;
  } else {
    leap = LEAP_Unsynchronised;
  }
  message.lvm = ((leap << 6) &0xc0) | ((version << 3) & 0x38) | (MODE_BROADCAST & 0x07);
  message.stratum = our_stratum;
  message.poll = 6; /* FIXME: what should this be? */
  message.precision = LCL_GetSysPrecisionAsLog();
  /* If we're sending a client mode packet and we aren't synchronized yet, 
     we might have to set up artificial values for some of these parameters */
  message.root_delay = UTI_DoubleToInt32(our_root_delay);
  message.root_dispersion = UTI_DoubleToInt32(our_root_dispersion);
  message.reference_id = htonl((NTP_int32) our_ref_id);
  /* Now fill in timestamps */
  UTI_TimevalToInt64(&our_ref_time, &message.reference_ts, 0);
  message.originate_ts.hi = 0UL;
  message.originate_ts.lo = 0UL;
  message.receive_ts.hi = 0UL;
  message.receive_ts.lo = 0UL;
  ts_fuzz = UTI_GetNTPTsFuzz(message.precision);
  LCL_ReadCookedTime(&local_transmit, NULL);
  UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, ts_fuzz);
  NIO_SendNormalPacket(&message, &d->addr, &d->local_addr);
  /* Requeue timeout.  Don't care if interval drifts gradually, so just do it
   * at the end. */
  SCH_AddTimeoutInClass((double) d->interval, 1.0, 0.02,
                        SCH_NtpBroadcastClass,
                        timeout_handler, (void *) d);
 }
 /* ================================================== */
 void 
 BRD_AddDestination(IPAddr *addr, unsigned short port, int interval)
 {
  if (max_destinations == n_destinations) {
    /* Expand array */
    max_destinations += 8;
    if (destinations) {
      destinations = ReallocArray(Destination, max_destinations, destinations);
    } else {
      destinations = MallocArray(Destination, max_destinations);
    }
  }
  destinations[n_destinations].addr.ip_addr = *addr;
  destinations[n_destinations].addr.port = port;
  destinations[n_destinations].local_addr.ip_addr.family = IPADDR_UNSPEC;
  destinations[n_destinations].local_addr.sock_fd =
    NIO_GetServerSocket(&destinations[n_destinations].addr);
  destinations[n_destinations].interval = interval;
  SCH_AddTimeoutInClass((double) interval, 1.0, 0.0,
                        SCH_NtpBroadcastClass,
                        timeout_handler, (void *)(destinations + n_destinations));
  ++n_destinations;
 }
--- a/broadcast.h
+++ b/broadcast.h
@@ -2,9 +2,7 @@
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
- * Copyright (C) Richard P. Curnow  1997-2003
+ * Copyright (C) Richard P. Curnow  1997-2002
 * Copyright (C) John G. Hasler  2009
 * Copyright (C) Miroslav Lichvar  2009-2012, 2014-2018
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -23,14 +21,17 @@
  =======================================================================
-  The header file for shared Posix functionality
+  Deal with broadcast server functions.
  */
-#ifndef GOT_SYS_POSIX_H
+#ifndef GOT_BROADCAST_H
-#define GOT_SYS_POSIX_H
+#define GOT_BROADCAST_H
-extern void SYS_Posix_MemLockAll(void);
+#include "addressing.h"
-extern void SYS_Posix_SetScheduler(int priority);
+extern void BRD_Initialise(void);
 extern void BRD_Finalise(void);
 extern void BRD_AddDestination(IPAddr *addr, unsigned short port, int interval);
 #endif /* GOT_BROADCAST_H */
 #endif  /* GOT_SYS_POSIX_H */
--- a/candm.h
+++ b/candm.h
@@ -31,6 +31,7 @@
 #include "sysincl.h"
 #include "addressing.h"
 #include "hash.h"
 /* This is the default port to use for CANDM, if no alternative is
   defined */
@@ -87,28 +88,18 @@
 #define REQ_MODIFY_MAXDELAYDEVRATIO 47
 #define REQ_RESELECT 48
 #define REQ_RESELECTDISTANCE 49
-#define REQ_MODIFY_MAKESTEP 50
+#define N_REQUEST_TYPES 50
 #define REQ_SMOOTHING 51
 #define REQ_SMOOTHTIME 52
 #define REQ_REFRESH 53
 #define REQ_SERVER_STATS 54
 #define REQ_CLIENT_ACCESSES_BY_INDEX2 55
 #define REQ_LOCAL2 56
 #define REQ_NTP_DATA 57
 #define REQ_ADD_SERVER2 58
 #define REQ_ADD_PEER2 59
 #define REQ_ADD_SERVER3 60
 #define REQ_ADD_PEER3 61
 #define REQ_SHUTDOWN 62
 #define REQ_ONOFFLINE 63
 #define N_REQUEST_TYPES 64
-/* Structure used to exchange timespecs independent of time_t size */
+/* Special utoken value used to log on with first exchange being the
   password.  (This time value has long since gone by) */
 #define SPECIAL_UTOKEN 0x10101010
 /* Structure used to exchange timevals independent on size of time_t */
 typedef struct {
  uint32_t tv_sec_high;
  uint32_t tv_sec_low;
  uint32_t tv_nsec;
-} Timespec;
+} Timeval;
 /* This is used in tv_sec_high for 32-bit timestamps */
 #define TV_NOHIGHSEC 0x7fffffff
@@ -124,10 +115,6 @@ typedef struct {
   pktlength.c, to get the number of bytes that ought to be
   transmitted for each packet type. */
 typedef struct {
  int32_t EOR;
 } REQ_Null;
 typedef struct {
  IPAddr mask;
  IPAddr address;
@@ -201,26 +188,18 @@ typedef struct {
 } REQ_Modify_Maxupdateskew;
 typedef struct {
-  int32_t limit;
+  Timeval ts;
  Float threshold;
  int32_t EOR;
 } REQ_Modify_Makestep;
 typedef struct {
  Timespec ts;
  int32_t EOR;
 } REQ_Logon;
 typedef struct {
-  Timespec ts;
+  Timeval ts;
  int32_t EOR;
 } REQ_Settime;
 typedef struct {
  int32_t on_off;
  int32_t stratum;
  Float distance;
  int32_t orphan;
  int32_t EOR;
 } REQ_Local;
@@ -229,11 +208,19 @@ typedef struct {
  int32_t EOR;
 } REQ_Manual;
 typedef struct {
  int32_t EOR;
 } REQ_N_Sources;
 typedef struct {
  int32_t index;
  int32_t EOR;
 } REQ_Source_Data;
 typedef struct {
  int32_t EOR;
 } REQ_Rekey;
 typedef struct {
  IPAddr ip;
  int32_t subnet_bits;
@@ -251,10 +238,6 @@ typedef struct {
 #define REQ_ADDSRC_IBURST 0x4
 #define REQ_ADDSRC_PREFER 0x8
 #define REQ_ADDSRC_NOSELECT 0x10
 #define REQ_ADDSRC_TRUST 0x20
 #define REQ_ADDSRC_REQUIRE 0x40
 #define REQ_ADDSRC_INTERLEAVED 0x80
 #define REQ_ADDSRC_BURST 0x100
 typedef struct {
  IPAddr ip_addr;
@@ -262,22 +245,10 @@ typedef struct {
  int32_t minpoll;
  int32_t maxpoll;
  int32_t presend_minpoll;
  uint32_t min_stratum;
  uint32_t poll_target;
  uint32_t version;
  uint32_t max_sources;
  int32_t min_samples;
  int32_t max_samples;
  uint32_t authkey;
  Float max_delay;
  Float max_delay_ratio;
  Float max_delay_dev_ratio;
  Float min_delay;
  Float asymmetry;
  Float offset;
  uint32_t flags;
  int32_t filter_length;
  uint32_t reserved[3];
  int32_t EOR;
 } REQ_NTP_Source;
@@ -286,6 +257,10 @@ typedef struct {
  int32_t EOR;
 } REQ_Del_Source;
 typedef struct {
  int32_t EOR;
 } REQ_WriteRtc;
 typedef struct {
  Float dfreq;
  int32_t EOR;
@@ -297,44 +272,68 @@ typedef struct {
  int32_t EOR;
 } REQ_Doffset;
 typedef struct {
  int32_t EOR;
 } REQ_Tracking;
 typedef struct {
  uint32_t index;
  int32_t EOR;
 } REQ_Sourcestats;
 typedef struct {
  int32_t EOR;
 } REQ_RTCReport;
 typedef struct {
  int32_t EOR;
 } REQ_TrimRTC;
 typedef struct {
  int32_t EOR;
 } REQ_CycleLogs;
 typedef struct {
  IPAddr ip;
  uint32_t bits_specd;
 } REQ_SubnetsAccessed_Subnet;
 /* This is based on the response size rather than the
   request size */
 #define MAX_CLIENT_ACCESSES 8
 typedef struct {
  uint32_t first_index;
-  uint32_t n_clients;
+  uint32_t n_indices;
  int32_t EOR;
 } REQ_ClientAccessesByIndex;
 typedef struct {
  int32_t EOR;
 } REQ_ManualList;
 typedef struct {
  int32_t index;
  int32_t EOR;
 } REQ_ManualDelete;
 typedef struct {
  int32_t EOR;
 } REQ_MakeStep;
 typedef struct {
  int32_t EOR;
 } REQ_Activity;
 typedef struct {
  int32_t EOR;
 } REQ_Reselect;
 typedef struct {
  Float distance;
  int32_t EOR;
 } REQ_ReselectDistance;
 #define REQ_SMOOTHTIME_RESET 0
 #define REQ_SMOOTHTIME_ACTIVATE 1
 typedef struct {
  int32_t option;
  int32_t EOR;
 } REQ_SmoothTime;
 typedef struct {
  IPAddr ip_addr;
  int32_t EOR;
 } REQ_NTPData;
 /* ================================================== */
 #define PKT_TYPE_CMD_REQUEST 1
@@ -363,17 +362,7 @@ typedef struct {
   subnets accessed and client accesses
   Version 6 : added padding to requests to prevent amplification attack,
-   changed maximum number of samples in manual list to 16, new commands: modify
+   changed maximum number of samples in manual list to 16
   makestep, smoothing, smoothtime
   Support for authentication was removed later in version 6 of the protocol
   and commands that required authentication are allowed only locally over Unix
   domain socket.
   Version 6 (no authentication) : changed format of client accesses by index
   (using new request/reply types) and manual timestamp, added new fields and
   flags to NTP source request and report, made length of manual list constant,
   added new commands: ntpdata, refresh, serverstats, shutdown
 */
 #define PROTO_VERSION_NUMBER 6
@@ -387,7 +376,7 @@ typedef struct {
 #define PROTO_VERSION_PADDING 6
 /* The maximum length of padding in request packet, currently
-   defined by MANUAL_LIST */
+   defined by CLIENT_ACCESSES_BY_INDEX and MANUAL_LIST */
 #define MAX_PADDING_LENGTH 396
 /* ================================================== */
@@ -402,11 +391,10 @@ typedef struct {
                             (count up from zero for same sequence
                             number) */
  uint32_t sequence; /* Client's sequence number */
-  uint32_t pad1;
+  uint32_t utoken; /* Unique token per incarnation of daemon */
-  uint32_t pad2;
+  uint32_t token; /* Command token (to prevent replay attack) */
  union {
    REQ_Null null;
    REQ_Online online;
    REQ_Offline offline;
    REQ_Burst burst;
@@ -419,30 +407,43 @@ typedef struct {
    REQ_Modify_Minstratum modify_minstratum;
    REQ_Modify_Polltarget modify_polltarget;
    REQ_Modify_Maxupdateskew modify_maxupdateskew;
    REQ_Modify_Makestep modify_makestep;
    REQ_Logon logon;
    REQ_Settime settime;
    REQ_Local local;
    REQ_Manual manual;
    REQ_N_Sources n_sources;
    REQ_Source_Data source_data;
    REQ_Rekey rekey;
    REQ_Allow_Deny allow_deny;
    REQ_Ac_Check ac_check;
    REQ_NTP_Source ntp_source;
    REQ_Del_Source del_source;
    REQ_WriteRtc writertc;
    REQ_Dfreq dfreq;
    REQ_Doffset doffset;
    REQ_Tracking tracking;
    REQ_Sourcestats sourcestats;
    REQ_RTCReport rtcreport;
    REQ_TrimRTC trimrtc;
    REQ_CycleLogs cyclelogs;
    REQ_ClientAccessesByIndex client_accesses_by_index;
    REQ_ManualList manual_list;
    REQ_ManualDelete manual_delete;
    REQ_MakeStep make_step;
    REQ_Activity activity;
    REQ_Reselect reselect;
    REQ_ReselectDistance reselect_distance;
    REQ_SmoothTime smoothtime;
    REQ_NTPData ntp_data;
  } data; /* Command specific parameters */
-  /* Padding used to prevent traffic amplification.  It only defines the
+  /* The following fields only set the maximum size of the packet.
-     maximum size of the packet, there is no hole after the data field. */
+     There are no holes between them and the actual data. */
  /* Padding used to prevent traffic amplification */
  uint8_t padding[MAX_PADDING_LENGTH];
  /* Authentication data */
  uint8_t auth[MAX_HASH_LENGTH];
 } CMD_Request;
 /* ================================================== */
@@ -467,13 +468,7 @@ typedef struct {
 #define RPY_CLIENT_ACCESSES_BY_INDEX 10
 #define RPY_MANUAL_LIST 11
 #define RPY_ACTIVITY 12
-#define RPY_SMOOTHING 13
+#define N_REPLY_TYPES 13
 #define RPY_SERVER_STATS 14
 #define RPY_CLIENT_ACCESSES_BY_INDEX2 15
 #define RPY_NTP_DATA 16
 #define RPY_MANUAL_TIMESTAMP2 17
 #define RPY_MANUAL_LIST2 18
 #define N_REPLY_TYPES 19
 /* Status codes */
 #define STT_SUCCESS 0
@@ -520,8 +515,6 @@ typedef struct {
 #define RPY_SD_FLAG_NOSELECT 0x1
 #define RPY_SD_FLAG_PREFER 0x2
 #define RPY_SD_FLAG_TRUST 0x4
 #define RPY_SD_FLAG_REQUIRE 0x8
 typedef struct {
  IPAddr ip_addr;
@@ -543,7 +536,7 @@ typedef struct {
  IPAddr ip_addr;
  uint16_t stratum;
  uint16_t leap_status;
-  Timespec ref_time;
+  Timeval ref_time;
  Float current_correction;
  Float last_offset;
  Float rms_offset;
@@ -571,7 +564,7 @@ typedef struct {
 } RPY_Sourcestats;
 typedef struct {
-  Timespec ref_time;
+  Timeval ref_time;
  uint16_t n_samples;
  uint16_t n_runs;
  uint32_t span_seconds;
@@ -581,7 +574,7 @@ typedef struct {
 } RPY_Rtc;
 typedef struct {
-  Float offset;
+  uint32_t centiseconds;
  Float dfreq_ppm;
  Float new_afreq_ppm;
  int32_t EOR;
@@ -589,14 +582,17 @@ typedef struct {
 typedef struct {
  IPAddr ip;
-  uint32_t ntp_hits;
+  uint32_t bits_specd;
-  uint32_t cmd_hits;
+  uint32_t bitmap[8];
-  uint32_t ntp_drops;
+} RPY_SubnetsAccessed_Subnet;
-  uint32_t cmd_drops;
+
-  int8_t ntp_interval;
+typedef struct {
-  int8_t cmd_interval;
+  IPAddr ip;
-  int8_t ntp_timeout_interval;
+  uint32_t client_hits;
-  int8_t pad;
+  uint32_t peer_hits;
  uint32_t cmd_hits_auth;
  uint32_t cmd_hits_normal;
  uint32_t cmd_hits_bad;
  uint32_t last_ntp_hit_ago;
  uint32_t last_cmd_hit_ago;
 } RPY_ClientAccesses_Client;
@@ -609,19 +605,10 @@ typedef struct {
  int32_t EOR;
 } RPY_ClientAccessesByIndex;
 typedef struct {
  uint32_t ntp_hits;
  uint32_t cmd_hits;
  uint32_t ntp_drops;
  uint32_t cmd_drops;
  uint32_t log_drops;
  int32_t EOR;
 } RPY_ServerStats;
 #define MAX_MANUAL_LIST_SAMPLES 16
 typedef struct {
-  Timespec when;
+  Timeval when;
  Float slewed_offset;
  Float orig_offset;
  Float residual;
@@ -642,52 +629,6 @@ typedef struct {
  int32_t EOR;
 } RPY_Activity;
 #define RPY_SMT_FLAG_ACTIVE 0x1
 #define RPY_SMT_FLAG_LEAPONLY 0x2
 typedef struct {
  uint32_t flags;
  Float offset;
  Float freq_ppm;
  Float wander_ppm;
  Float last_update_ago;
  Float remaining_time;
  int32_t EOR;
 } RPY_Smoothing;
 #define RPY_NTP_FLAGS_TESTS 0x3ff
 #define RPY_NTP_FLAG_INTERLEAVED 0x4000
 #define RPY_NTP_FLAG_AUTHENTICATED 0x8000
 typedef struct {
  IPAddr remote_addr;
  IPAddr local_addr;
  uint16_t remote_port;
  uint8_t leap;
  uint8_t version;
  uint8_t mode;
  uint8_t stratum;
  int8_t poll;
  int8_t precision;
  Float root_delay;
  Float root_dispersion;
  uint32_t ref_id;
  Timespec ref_time;
  Float offset;
  Float peer_delay;
  Float peer_dispersion;
  Float response_time;
  Float jitter_asymmetry;
  uint16_t flags;
  uint8_t tx_tss_char;
  uint8_t rx_tss_char;
  uint32_t total_tx_count;
  uint32_t total_rx_count;
  uint32_t total_valid_count;
  uint32_t reserved[4];
  int32_t EOR;
 } RPY_NTPData;
 typedef struct {
  uint8_t version;
  uint8_t pkt_type;
@@ -700,9 +641,9 @@ typedef struct {
  uint16_t pad2;
  uint16_t pad3;
  uint32_t sequence; /* Echo of client's sequence number */
-  uint32_t pad4;
+  uint32_t utoken; /* Unique token per incarnation of daemon */
-  uint32_t pad5;
+  uint32_t token; /* New command token (only if command was successfully
-
+                          authenticated) */
  union {
    RPY_Null null;
    RPY_N_Sources n_sources;
@@ -712,13 +653,14 @@ typedef struct {
    RPY_Sourcestats sourcestats;
    RPY_Rtc rtc;
    RPY_ClientAccessesByIndex client_accesses_by_index;
    RPY_ServerStats server_stats;
    RPY_ManualList manual_list;
    RPY_Activity activity;
    RPY_Smoothing smoothing;
    RPY_NTPData ntp_data;
  } data; /* Reply specific parameters */
  /* authentication of the packet, there is no hole after the actual data
     from the data union, this field only sets the maximum auth size */
  uint8_t auth[MAX_HASH_LENGTH];
 } CMD_Reply;
 /* ================================================== */
--- a/chrony.1
+++ b/chrony.1
@@ -0,0 +1,71 @@
 .TH CHRONY 1 "@MAN_DATE@" "chrony @VERSION@" "User's Manual"
 .SH NAME
 chrony \- programs for keeping computer clocks accurate
 .SH SYNOPSIS
 \fBchronyc\fR [\fIOPTIONS\fR]
 \fBchronyd\fR [\fIOPTIONS\fR]
 .SH DESCRIPTION
 \fBchrony\fR is a pair of programs for keeping computer clocks accurate.
 \fIchronyd\fR is a background (daemon) program and \fIchronyc\fR is a
 command-line interface to it. Time reference sources for chronyd can be
 RFC1305 NTP servers, human (via keyboard and \fIchronyc\fR), or the computer's
 real-time clock at boot time (Linux only). chronyd can determine the rate at
 which the computer gains or loses time and compensate for it while no external
 reference is present. Its use of NTP servers can be switched on and off
 (through \fIchronyc\fR) to support computers with dial-up/intermittent access
 to the Internet, and it can also act as an RFC1305-compatible NTP server.
 .SH USAGE
 \fIchronyc\fR is a command-line interface program which can be used to
 monitor \fIchronyd\fR's performance and to change various operating
 parameters whilst it is running.
 \fIchronyd\fR's main function is to obtain measurements of the true (UTC)
 time from one of several sources, and correct the system clock
 accordingly.  It also works out the rate at which the system clock
 gains or loses time and uses this information to keep it accurate
 between measurements from the reference.
 The reference time can be derived from either Network Time Protocol
 (NTP) servers, reference clocks, or wristwatch-and-keyboard (via \fIchronyc\fR).
 The main source of information about the Network Time Protocol is
 \fIhttp://www.ntp.org\fR.
 It is designed so that it can work on computers which only have
 intermittent access to reference sources, for example computers which
 use a dial-up account to access the Internet or laptops.  Of course, it
 will work well on computers with permanent connections too.
 In addition, on Linux it can monitor the system's real time clock
 performance, so the system can maintain accurate time even across
 reboots.
 Typical accuracies available between 2 machines are
 On an ethernet LAN : 100-200 microseconds, often much better
 On a V32bis dial-up modem connection : 10's of milliseconds (from one
 session to the next)
 With a good reference clock the accuracy can reach one microsecond.
 \fIchronyd\fR can also operate as an RFC1305-compatible NTP server and peer.
 .SH "SEE ALSO"
 .BR chronyc(1),
 .BR chrony.conf(5),
 .BR chronyd(8)
 .I http://chrony.tuxfamily.org/
 .SH AUTHOR
 Richard Curnow <rc@rc0.org.uk>
 This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
 of "The Missing Man Pages Project".  Please see
 \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
 The complete chrony documentation is supplied in texinfo format.
--- a/chrony.conf.5.in
+++ b/chrony.conf.5.in
@@ -0,0 +1,55 @@
 .TH chrony.conf 5 "@MAN_DATE@" "chrony @VERSION@" "Configuration Files"
 .SH NAME
 chrony.conf \- chronyd configuration file
 .SH SYNOPSIS
 .B @SYSCONFDIR@/chrony.conf
 .SH DESCRIPTION
 \fIchrony\fR is a pair of programs for maintaining the accuracy of computer
 clocks. \fIchronyd\fR is a background daemon program that can be started at
 boot time.
 Assuming that you have found some servers, you need to set up a
 configuration file to run \fIchrony\fR.  The (compiled-in) default location
 for this file is \fB@SYSCONFDIR@/chrony.conf\fR.  Assuming that your ntp servers
 are called `a.b.c' and `d.e.f', your \fBchrony.conf\fR file could contain
 as a minimum
     server a.b.c
     server d.e.f
     server g.h.i
 However, you will probably want to include some of the other directives
 described in detail in the documentation supplied with the distribution
 (\fIchrony.txt\fR and \fIchrony.texi\fR). The following directives may be
 particularly useful : `driftfile', `generatecommandkey', `keyfile', `makestep'.
 Also, the `iburst' server option is useful to speed up the initial
 synchronization. The smallest useful configuration file would look something
 like
     server a.b.c iburst
     server d.e.f iburst
     server g.h.i iburst
     keyfile @SYSCONFDIR@/chrony.keys
     generatecommandkey
     driftfile @CHRONYVARDIR@/drift
     makestep 10 3
 .SH "SEE ALSO"
 .BR chrony(1),
 .BR chronyc(1),
 .BR chronyd(8)
 .I http://chrony.tuxfamily.org/
 .SH AUTHOR
 Richard Curnow <rc@rc0.org.uk>
 This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
 Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
 for details.
 The complete chrony documentation is supplied in texinfo format.
--- a/chrony.texi.in
+++ b/chrony.texi.in
--- a/chrony_timex.h
+++ b/chrony_timex.h
@@ -0,0 +1,73 @@
 /* Taken from /usr/include/linux/timex.h.  Avoids the need to
 * include kernel header files. */
 #ifndef CHRONY_TIMEX_H
 #define CHRONY_TIMEX_H
 #include <sys/time.h>
 struct timex {
 	unsigned int modes;	/* mode selector */
 	long offset;		/* time offset (usec) */
 	long freq;		/* frequency offset (scaled ppm) */
 	long maxerror;		/* maximum error (usec) */
 	long esterror;		/* estimated error (usec) */
 	int status;		/* clock command/status */
 	long constant;		/* pll time constant */
 	long precision;		/* clock precision (usec) (read only) */
 	long tolerance;		/* clock frequency tolerance (ppm)
 				 * (read only)
 				 */
 	struct timeval time;	/* (read only) */
 	long tick;		/* (modified) usecs between clock ticks */
 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
 	long jitter;            /* pps jitter (us) (ro) */
 	int shift;              /* interval duration (s) (shift) (ro) */
 	long stabil;            /* pps stability (scaled ppm) (ro) */
 	long jitcnt;            /* jitter limit exceeded (ro) */
 	long calcnt;            /* calibration intervals (ro) */
 	long errcnt;            /* calibration errors (ro) */
 	long stbcnt;            /* stability limit exceeded (ro) */
 	int  :32; int  :32; int  :32; int  :32;
 	int  :32; int  :32; int  :32; int  :32;
 	int  :32; int  :32; int  :32; int  :32;
 };
 #define ADJ_OFFSET		0x0001  /* time offset */
 #define ADJ_FREQUENCY		0x0002	/* frequency offset */
 #define ADJ_MAXERROR		0x0004	/* maximum time error */
 #define ADJ_STATUS		0x0010	/* clock status */
 #define ADJ_TIMECONST		0x0020  /* pll time constant */
 #define ADJ_SETOFFSET		0x0100  /* add 'time' to current time */
 #define ADJ_NANO		0x2000  /* select nanosecond resolution */
 #define ADJ_TICK		0x4000	/* tick value */
 #define ADJ_OFFSET_SINGLESHOT	0x8001	/* old-fashioned adjtime */
 #define ADJ_OFFSET_SS_READ	0xa001  /* read-only adjtime */
 #define SHIFT_USEC 16		/* frequency offset scale (shift) */
 #define STA_PLL		0x0001	/* enable PLL updates (rw) */
 #define STA_PPSFREQ	0x0002	/* enable PPS freq discipline (rw) */
 #define STA_PPSTIME	0x0004	/* enable PPS time discipline (rw) */
 #define STA_FLL		0x0008	/* select frequency-lock mode (rw) */
 #define STA_INS		0x0010	/* insert leap (rw) */
 #define STA_DEL		0x0020	/* delete leap (rw) */
 #define STA_UNSYNC	0x0040	/* clock unsynchronized (rw) */
 #define STA_FREQHOLD	0x0080	/* hold frequency (rw) */
 #define STA_PPSSIGNAL	0x0100	/* PPS signal present (ro) */
 #define STA_PPSJITTER	0x0200	/* PPS signal jitter exceeded (ro) */
 #define STA_PPSWANDER	0x0400	/* PPS signal wander exceeded (ro) */
 #define STA_PPSERROR	0x0800	/* PPS signal calibration error (ro) */
 #define STA_CLOCKERR	0x1000	/* clock hardware fault (ro) */
 #define STA_NANO	0x2000  /* resolution (0 = us, 1 = ns) (ro) */
 /* This doesn't seem to be in any include files !! */
 extern int adjtimex(struct timex *);
 #endif /* CHRONY_TIMEX_H */
--- a/chronyc.1.in
+++ b/chronyc.1.in
@@ -0,0 +1,75 @@
 .TH CHRONYC 1 "@MAN_DATE@" "chrony @VERSION@" "User's Manual"
 .SH NAME
 chronyc \- command-line interface for chronyd
 .SH SYNOPSIS
 .B chronyc
 [\fIOPTIONS\fR]
 .SH DESCRIPTION
 \fIchrony\fR is a pair of programs for maintaining the accuracy of computer
 clocks.
 \fBchronyc\fR is a command-line interface program which can be used to
 monitor \fIchronyd\fR's performance and to change various operating
 parameters whilst it is running.
 .SH USAGE
 A detailed description of all commands supported by \fBchronyc\fR is available
 via the documentation supplied with the distribution (\fIchrony.txt\fR and
 \fIchrony.texi\fR).
 .SH OPTIONS
 A summary of the options supported by \fBchronyc\fR is included below.
 .TP
 \fB\-h\fR \fIhostname\fR
 specify hostname (default 127.0.0.1)
 .TP
 \fB\-p\fR \fIport-number\fR
 specify port-number
 .TP
 \fB\-n\fR
 display raw IP addresses (don't attempt to look up hostnames)
 .TP
 \fB\-4\fR
 resolve hostnames only to IPv4 addresses
 .TP
 \fB\-6\fR
 resolve hostnames only to IPv6 addresses
 .TP
 \fB\-m\fR
 allow multiple commands to be specified on the command line.  Each argument
 will be interpreted as a whole command.
 .TP
 \fB\-f\fR \fIconf-file\fR
 This option can be used to specify an alternate location for the
 configuration file (default \fI@SYSCONFDIR@/chrony.conf\fR). The configuration file is
 needed for the \fB-a\fR option.
 .TP
 \fB\-a\fR
 With this option chronyc will try to authenticate automatically on
 start. It will read the configuration file, read the command key from the
 keyfile and run the authhash and password commands.
 .TP
 \fIcommand\fR
 specify command.  If no command is given, chronyc will read commands
 interactively.
 .SH BUGS
 To report bugs, please visit \fIhttp://chrony.tuxfamily.org\fR
 .SH "SEE ALSO"
 .BR chronyd(8),
 .BR chrony(1)
 .I http://chrony.tuxfamily.org/
 .SH AUTHOR
 Richard Curnow <rc@rc0.org.uk>
 This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
 Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
 for details.
 The complete chrony documentation is supplied in texinfo format.
--- a/chronyd.8.in
+++ b/chronyd.8.in
@@ -0,0 +1,154 @@
 .TH CHRONYD 8 "@MAN_DATE@" "chrony @VERSION@" "System Administration"
 .SH NAME
 chronyd \- chrony background daemon
 .SH SYNOPSIS
 .B chronyd
 [\fIOPTIONS\fR] [\fIconfiguration commands\fR]
 .SH DESCRIPTION
 \fIchrony\fR is a pair of programs for maintaining the accuracy of computer
 clocks. \fBchronyd\fR is a background daemon program that can be started at boot
 time.
 \fBchronyd\fR is a daemon which runs in background on the
 system.  It obtains measurements (e.g. via the network) of the
 system's offset relative to other systems, and adjusts the system
 time accordingly.  For isolated systems, the user can periodically
 enter the correct time by hand (using \fIchronyc\fR).  In either case,
 \fBchronyd\fR determines the rate at which the computer
 gains or loses time, and compensates for this.
 .SH USAGE
 \fBchronyd\fR is usually started at boot-time and requires superuser
 privileges.
 If \fBchronyd\fR has been installed to its default location
 \fI@SBINDIR@/chronyd\fR, starting it is simply a matter of entering the
 command:
 \fI@SBINDIR@/chronyd\fR
 Information messages and warnings will be logged to syslog.
 If no configuration commands are specified on the command line,
 \fBchronyd\fR will read the commands from the configuration file
 (default \fI@SYSCONFDIR@/chrony.conf\fR).
 .SH OPTIONS
 A summary of the options supported by \fBchronyd\fR is included below.
 .TP
 \fB\-P\fR \fIpriority\fR
 This option will select the SCHED_FIFO real-time scheduler at the specified
 priority (which must be between 0 and 100).  This mode is supported only on
 Linux.
 .TP
 .B \-m
 This option will lock chronyd into RAM so that it will never be paged out.
 This mode is only supported on Linux.
 .TP
 .B \-n
 When run in this mode, the program will not detach itself from the
 terminal.
 .TP
 .B \-d
 When run in this mode, the program will not detach itself from the
 terminal, and all messages will be sent to the terminal instead of
 to syslog.  When \fBchronyd\fR was compiled with debugging support,
 this option can be used twice to print also debugging messages.
 .TP
 \fB\-f\fR \fIconf-file\fR
 This option can be used to specify an alternate location for the
 configuration file (default \fI@SYSCONFDIR@/chrony.conf\fR).
 .TP
 .B \-r
 This option will reload sample histories for each of the servers being used.
 These histories are created by using the \fIdump\fR command in \fIchronyc\fR,
 or by setting the \fIdumponexit\fR directive in the configuration file.  This
 option is useful if you want to stop and restart \fBchronyd\fR briefly for any
 reason, e.g. to install a new version.  However, it only makes sense on
 systems where the kernel can maintain clock compensation whilst not under
 \fBchronyd\fR's control.  The only version where this happens so far is Linux.
 On systems where this is not the case, e.g. Solaris and SunOS the option
 should not be used.
 .TP
 .B \-R
 When this option is used, the \fIinitstepslew\fR directive and the
 \fImakestep\fR directive used with a positive limit will be ignored. This
 option is useful when restarting \fBchronyd\fR and can be used in conjunction
 with the \fB-r\fR option.
 .TP
 .B \-s
 This option will set the system clock from the computer's real-time
 clock.  This is analogous to supplying the \fI-s\fR flag to the
 \fI/sbin/hwclock\fR program during the Linux boot sequence.
 Support for real-time clocks is limited at present - the criteria
 are described in the section on the \fIrtcfile\fR directive in the
 documentation supplied with the distribution.
 If used in conjunction with the \fB-r\fR flag, \fBchronyd\fR will attempt
 to preserve the old samples after setting the system clock from
 the real time clock (RTC).  This can be used to allow \fBchronyd\fR to
 perform long term averaging of the gain or loss rate across system
 reboots, and is useful for dial-up systems that are shut down when
 not in use.  For this to work well, it relies on \fBchronyd\fR having
 been able to determine accurate statistics for the difference
 between the RTC and system clock last time the computer was on.
 If \fBchronyd\fR doesn't support the RTC on your computer or there is no RTC
 installed, the system clock will be set with this option forward to the time of
 the last modification of the drift file (specified by the \fIdriftfile\fR
 directive) to restore the system time at which \fBchronyd\fR was previously
 stopped.
 .TP
 \fB\-u\fR \fIuser\fR
 This option sets the name of the user to which will \fBchronyd\fR switch to
 drop root privileges if compiled with Linux capabilities support (default
 \fB@DEFAULT_USER@\fR).
 .TP
 .B \-q
 When run in this mode, chronyd will set the system clock once
 and exit.  It will not detach from the terminal.
 .TP
 .B \-Q
 This option is similar to \fB\-q\fR, but it will only print the offset and
 not correct the clock.
 .TP
 .B \-v
 This option displays \fBchronyd\fR's version number to the terminal and exits
 .TP
 .B \-4
 Resolve hostnames only to IPv4 addresses and create only IPv4 sockets.
 .TP
 .B \-6
 Resolve hostnames only to IPv6 addresses and create only IPv6 sockets.
 .SH FILES
 \fI@SYSCONFDIR@/chrony.conf\fR
 .SH BUGS
 To report bugs, please visit \fIhttp://chrony.tuxfamily.org/\fR
 .SH "SEE ALSO"
 \fBchronyd\fR is documented in detail in the documentation supplied with the
 distribution (\fIchrony.txt\fR and \fIchrony.texi\fR).
 .BR chrony(1),
 .BR chronyc(1),
 .BR chrony.conf(5),
 .BR hwclock(8),
 .BR ntpd(8)
 .I http://chrony.tuxfamily.org/
 .SH AUTHOR
 Richard Curnow <rc@rc0.org.uk>
 This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
 of "The Missing Man Pages Project".  Please see
 \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
 The complete chrony documentation is supplied in texinfo format.
--- a/client.c
+++ b/client.c
--- a/clientlog.c
+++ b/clientlog.c
--- a/clientlog.h
+++ b/clientlog.h
@@ -31,20 +31,55 @@
 #include "sysincl.h"
 #include "reports.h"
 /* Enough to hold flags for 256 hosts in a class C */
 typedef uint32_t CLG_Bitmap[8];
 extern void CLG_Initialise(void);
 extern void CLG_Finalise(void);
-extern int CLG_GetClientIndex(IPAddr *client);
+extern void CLG_LogNTPClientAccess(IPAddr *client, time_t now);
-extern int CLG_LogNTPAccess(IPAddr *client, struct timespec *now);
+extern void CLG_LogNTPPeerAccess(IPAddr *client, time_t now);
-extern int CLG_LogCommandAccess(IPAddr *client, struct timespec *now);
+
-extern int CLG_LimitNTPResponseRate(int index);
+/* When logging command packets, there are several subtypes */
-extern int CLG_LimitCommandResponseRate(int index);
+
-extern void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts);
+typedef enum {
-extern int CLG_GetNtpMinPoll(void);
+  CLG_CMD_AUTH,                 /* authenticated */
  CLG_CMD_NORMAL,               /* normal */
  CLG_CMD_BAD_PKT               /* bad version or packet length */
 } CLG_Command_Type;
 extern void CLG_LogCommandAccess(IPAddr *client, CLG_Command_Type type, time_t now);
 /* And some reporting functions, for use by chronyc. */
 /* TBD */
 typedef enum {
  CLG_SUCCESS,                  /* All is well */
  CLG_EMPTYSUBNET,              /* No hosts logged in requested subnet */
  CLG_BADSUBNET,                /* Subnet requested is not 0, 8, 16 or 24 bits */
  CLG_INACTIVE,                 /* Facility not active */
  CLG_INDEXTOOLARGE             /* Node index is higher than number of nodes present */
 } CLG_Status;
 /* For bits=0, 8, 16, flag which immediate subnets of that subnet are
   known.  For bits=24, flag which hosts in that subnet are known.
   Other values, return 0 (failed) */
 extern CLG_Status CLG_GetSubnetBitmap(IPAddr *subnet, int bits, CLG_Bitmap result);
 extern CLG_Status
 CLG_GetClientAccessReportByIP(IPAddr *ip, RPT_ClientAccess_Report *report, time_t now);
 CLG_Status
 CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report,
                                 time_t now, unsigned long *n_indices);
 /* And an iterating function, to call 'fn' for each client or peer
   that has accessed us since 'since'. */
 extern void CLG_IterateNTPClients
 (void (*fn)(IPAddr *client, void *arb),
 void *arb,
 time_t since);
 extern int CLG_GetNumberOfIndices(void);
 extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timespec *now);
 extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
 #endif /* GOT_CLIENTLOG_H */
--- a/cmdmon.c
+++ b/cmdmon.c
--- a/cmdmon.h
+++ b/cmdmon.h
@@ -33,7 +33,6 @@ extern void CAM_Initialise(int family);
 extern void CAM_Finalise(void);
 extern void CAM_OpenUnixSocket(void);
 extern int CAM_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all);
 extern int CAM_CheckAccessRestriction(IPAddr *ip_addr);
--- a/cmdparse.c
+++ b/cmdparse.c
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2013-2014, 2016
+ * Copyright (C) Miroslav Lichvar  2013
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -34,171 +34,164 @@
 #include "cmdparse.h"
 #include "memory.h"
 #include "nameserv.h"
 #include "ntp.h"
 #include "util.h"
 /* ================================================== */
-int
+CPS_Status
 CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 {
  char *hostname, *cmd;
-  int n;
+  int ok, n, done;
  CPS_Status result;
  src->port = SRC_DEFAULT_PORT;
  src->params.minpoll = SRC_DEFAULT_MINPOLL;
  src->params.maxpoll = SRC_DEFAULT_MAXPOLL;
  src->params.connectivity = SRC_ONLINE;
  src->params.auto_offline = 0;
  src->params.presend_minpoll = SRC_DEFAULT_PRESEND_MINPOLL;
  src->params.burst = 0;
  src->params.iburst = 0;
  src->params.min_stratum = SRC_DEFAULT_MINSTRATUM;
  src->params.poll_target = SRC_DEFAULT_POLLTARGET;
  src->params.version = 0;
  src->params.max_sources = SRC_DEFAULT_MAXSOURCES;
  src->params.min_samples = SRC_DEFAULT_MINSAMPLES;
  src->params.max_samples = SRC_DEFAULT_MAXSAMPLES;
  src->params.filter_length = 0;
  src->params.interleaved = 0;
  src->params.sel_options = 0;
  src->params.authkey = INACTIVE_AUTHKEY;
  src->params.max_delay = SRC_DEFAULT_MAXDELAY;
  src->params.max_delay_ratio = SRC_DEFAULT_MAXDELAYRATIO;
  src->params.max_delay_dev_ratio = SRC_DEFAULT_MAXDELAYDEVRATIO;
-  src->params.min_delay = 0.0;
+  src->params.online = 1;
-  src->params.asymmetry = SRC_DEFAULT_ASYMMETRY;
+  src->params.auto_offline = 0;
-  src->params.offset = 0.0;
+  src->params.iburst = 0;
  src->params.min_stratum = SRC_DEFAULT_MINSTRATUM;
  src->params.poll_target = SRC_DEFAULT_POLLTARGET;
  src->params.sel_option = SRC_SelectNormal;
  result = CPS_Success;
  hostname = line;
  line = CPS_SplitWord(line);
-  if (!*hostname)
+  if (!*hostname) {
-    return 0;
+    result = CPS_BadHost;
-
+    ok = 0;
-  src->name = hostname;
+  } else {
-
+    /* Parse subfields */
-  /* Parse options */
+    ok = 1;
-  for (; *line; line += n) {
+    done = 0;
    do {
      cmd = line;
      line = CPS_SplitWord(line);
    n = 0;
-    if (!strcasecmp(cmd, "auto_offline")) {
+      if (*cmd) {
        if (!strcasecmp(cmd, "port")) {
          if (sscanf(line, "%hu%n", &src->port, &n) != 1) {
            result = CPS_BadPort;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "minpoll")) {
          if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1) {
            result = CPS_BadMinpoll;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "maxpoll")) {
          if (sscanf(line, "%d%n", &src->params.maxpoll, &n) != 1) {
            result = CPS_BadMaxpoll;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "presend")) {
          if (sscanf(line, "%d%n", &src->params.presend_minpoll, &n) != 1) {
            result = CPS_BadPresend;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "maxdelaydevratio")) {
          if (sscanf(line, "%lf%n", &src->params.max_delay_dev_ratio, &n) != 1) {
            result = CPS_BadMaxdelaydevratio;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "maxdelayratio")) {
          if (sscanf(line, "%lf%n", &src->params.max_delay_ratio, &n) != 1) {
            result = CPS_BadMaxdelayratio;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "maxdelay")) {
          if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1) {
            result = CPS_BadMaxdelay;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "key")) {
          if (sscanf(line, "%lu%n", &src->params.authkey, &n) != 1 ||
              src->params.authkey == INACTIVE_AUTHKEY) {
            result = CPS_BadKey;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "offline")) {
          src->params.online = 0;
        } else if (!strcasecmp(cmd, "auto_offline")) {
          src->params.auto_offline = 1;
-    } else if (!strcasecmp(cmd, "burst")) {
+        
      src->params.burst = 1;
        } else if (!strcasecmp(cmd, "iburst")) {
          src->params.iburst = 1;
-    } else if (!strcasecmp(cmd, "offline")) {
+
      src->params.connectivity = SRC_OFFLINE;
    } else if (!strcasecmp(cmd, "noselect")) {
      src->params.sel_options |= SRC_SELECT_NOSELECT;
    } else if (!strcasecmp(cmd, "prefer")) {
      src->params.sel_options |= SRC_SELECT_PREFER;
    } else if (!strcasecmp(cmd, "require")) {
      src->params.sel_options |= SRC_SELECT_REQUIRE;
    } else if (!strcasecmp(cmd, "trust")) {
      src->params.sel_options |= SRC_SELECT_TRUST;
    } else if (!strcasecmp(cmd, "key")) {
      if (sscanf(line, "%"SCNu32"%n", &src->params.authkey, &n) != 1 ||
          src->params.authkey == INACTIVE_AUTHKEY)
        return 0;
    } else if (!strcasecmp(cmd, "asymmetry")) {
      if (sscanf(line, "%lf%n", &src->params.asymmetry, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "filter")) {
      if (sscanf(line, "%d%n", &src->params.filter_length, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxdelay")) {
      if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxdelayratio")) {
      if (sscanf(line, "%lf%n", &src->params.max_delay_ratio, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxdelaydevratio")) {
      if (sscanf(line, "%lf%n", &src->params.max_delay_dev_ratio, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxpoll")) {
      if (sscanf(line, "%d%n", &src->params.maxpoll, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxsamples")) {
      if (sscanf(line, "%d%n", &src->params.max_samples, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "maxsources")) {
      if (sscanf(line, "%d%n", &src->params.max_sources, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "mindelay")) {
      if (sscanf(line, "%lf%n", &src->params.min_delay, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "minpoll")) {
      if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "minsamples")) {
      if (sscanf(line, "%d%n", &src->params.min_samples, &n) != 1)
        return 0;
        } else if (!strcasecmp(cmd, "minstratum")) {
-      if (sscanf(line, "%d%n", &src->params.min_stratum, &n) != 1)
+          if (sscanf(line, "%d%n", &src->params.min_stratum, &n) != 1) {
-        return 0;
+            result = CPS_BadMinstratum;
-    } else if (!strcasecmp(cmd, "offset")) {
+            ok = 0;
-      if (sscanf(line, "%lf%n", &src->params.offset, &n) != 1)
+            done = 1;
        return 0;
    } else if (!strcasecmp(cmd, "port")) {
      if (sscanf(line, "%hu%n", &src->port, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "polltarget")) {
      if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "presend")) {
      if (sscanf(line, "%d%n", &src->params.presend_minpoll, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "version")) {
      if (sscanf(line, "%d%n", &src->params.version, &n) != 1)
        return 0;
    } else if (!strcasecmp(cmd, "xleave")) {
      src->params.interleaved = 1;
          } else {
      return 0;
    }
  }
  return 1;
 }
 /* ================================================== */
 int
 CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance)
 {
  int n;
  char *cmd;
  *stratum = 10;
  *distance = 1.0;
  *orphan = 0;
  while (*line) {
    cmd = line;
    line = CPS_SplitWord(line);
    if (!strcasecmp(cmd, "stratum")) {
      if (sscanf(line, "%d%n", stratum, &n) != 1 ||
          *stratum >= NTP_MAX_STRATUM || *stratum <= 0)
        return 0;
    } else if (!strcasecmp(cmd, "orphan")) {
      *orphan = 1;
      n = 0;
    } else if (!strcasecmp(cmd, "distance")) {
      if (sscanf(line, "%lf%n", distance, &n) != 1)
        return 0;
    } else {
      return 0;
    }
            line += n;
          }
-  return 1;
+        } else if (!strcasecmp(cmd, "polltarget")) {
          if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1) {
            result = CPS_BadPolltarget;
            ok = 0;
            done = 1;
          } else {
            line += n;
          }
        } else if (!strcasecmp(cmd, "noselect")) {
          src->params.sel_option = SRC_SelectNoselect;
        } else if (!strcasecmp(cmd, "prefer")) {
          src->params.sel_option = SRC_SelectPrefer;
        } else {
          result = CPS_BadOption;
          ok = 0;
          done = 1;
        }
      } else {
        done = 1;
      }
    } while (!done);
  }
  if (ok) {
    src->name = strdup(hostname);
  }
  return result;
 }
 /* ================================================== */
@@ -261,7 +254,7 @@ CPS_SplitWord(char *line)
 /* ================================================== */
 int
-CPS_ParseKey(char *line, uint32_t *id, const char **hash, char **key)
+CPS_ParseKey(char *line, unsigned long *id, const char **hash, char **key)
 {
  char *s1, *s2, *s3, *s4;
@@ -274,7 +267,7 @@ CPS_ParseKey(char *line, uint32_t *id, const char **hash, char **key)
  if (!*s2 || *s4)
    return 0;
-  if (sscanf(s1, "%"SCNu32, id) != 1)
+  if (sscanf(s1, "%lu", id) != 1)
    return 0;
  if (*s3) {
--- a/cmdparse.h
+++ b/cmdparse.h
@@ -30,6 +30,22 @@
 #include "srcparams.h"
 #include "addressing.h"
 typedef enum {
  CPS_Success,
  CPS_BadOption,
  CPS_BadHost,
  CPS_BadPort,
  CPS_BadMinpoll,
  CPS_BadMaxpoll,
  CPS_BadPresend,
  CPS_BadMaxdelaydevratio,
  CPS_BadMaxdelayratio,
  CPS_BadMaxdelay,
  CPS_BadKey,
  CPS_BadMinstratum,
  CPS_BadPolltarget
 } CPS_Status;
 typedef struct {
  char *name;
  unsigned short port;
@@ -37,10 +53,7 @@ typedef struct {
 } CPS_NTP_Source;
 /* Parse a command to add an NTP server or peer */
-extern int CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
+extern CPS_Status CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
 /* Parse a command to enable local reference */
 extern int CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance);
 /* Remove extra white-space and comments */
 extern void CPS_NormalizeLine(char *line);
@@ -49,6 +62,6 @@ extern void CPS_NormalizeLine(char *line);
 extern char *CPS_SplitWord(char *line);
 /* Parse a key from keyfile */
-extern int CPS_ParseKey(char *line, uint32_t *id, const char **hash, char **key);
+extern int CPS_ParseKey(char *line, unsigned long *id, const char **hash, char **key);
 #endif /* GOT_CMDPARSE_H */
--- a/conf.c
+++ b/conf.c
--- a/conf.h
+++ b/conf.h
@@ -29,18 +29,14 @@
 #define GOT_CONF_H
 #include "addressing.h"
 #include "reference.h"
-extern void CNF_Initialise(int restarted, int client_only);
+extern void CNF_SetRestarted(int);
 extern void CNF_Finalise(void);
 extern char *CNF_GetRtcDevice(void);
 extern void CNF_ReadFile(const char *filename);
 extern void CNF_ParseLine(const char *filename, int number, char *line);
 extern void CNF_CreateDirs(uid_t uid, gid_t gid);
 extern void CNF_AddInitSources(void);
 extern void CNF_AddSources(void);
 extern void CNF_AddBroadcasts(void);
@@ -52,7 +48,7 @@ extern char *CNF_GetDriftFile(void);
 extern char *CNF_GetLogDir(void);
 extern char *CNF_GetDumpDir(void);
 extern int CNF_GetLogBanner(void);
-extern int CNF_GetLogMeasurements(int *raw);
+extern int CNF_GetLogMeasurements(void);
 extern int CNF_GetLogStatistics(void);
 extern int CNF_GetLogTracking(void);
 extern int CNF_GetLogRtc(void);
@@ -60,13 +56,16 @@ extern int CNF_GetLogRefclocks(void);
 extern int CNF_GetLogTempComp(void);
 extern char *CNF_GetKeysFile(void);
 extern char *CNF_GetRtcFile(void);
 extern unsigned long CNF_GetCommandKey(void);
 extern int CNF_GetGenerateCommandKey(void);
 extern int CNF_GetDumpOnExit(void);
 extern int CNF_GetManualEnabled(void);
 extern int CNF_GetCommandPort(void);
 extern int CNF_GetRtcOnUtc(void);
 extern int CNF_GetRtcSync(void);
 extern void CNF_GetMakeStep(int *limit, double *threshold);
 extern void CNF_GetMaxChange(int *delay, int *ignore, double *offset);
-extern double CNF_GetLogChange(void);
+extern void CNF_GetLogChange(int *enabled, double *threshold);
 extern void CNF_GetMailOnChange(int *enabled, double *threshold, char **user);
 extern int CNF_GetNoClientLog(void);
 extern unsigned long CNF_GetClientLogLimit(void);
@@ -74,69 +73,37 @@ extern void CNF_GetFallbackDrifts(int *min, int *max);
 extern void CNF_GetBindAddress(int family, IPAddr *addr);
 extern void CNF_GetBindAcquisitionAddress(int family, IPAddr *addr);
 extern void CNF_GetBindCommandAddress(int family, IPAddr *addr);
 extern char *CNF_GetBindCommandPath(void);
 extern char *CNF_GetNtpSigndSocket(void);
 extern char *CNF_GetPidFile(void);
 extern REF_LeapMode CNF_GetLeapSecMode(void);
 extern char *CNF_GetLeapSecTimezone(void);
 /* Value returned in ppm, as read from file */
 extern double CNF_GetMaxUpdateSkew(void);
 extern double CNF_GetMaxClockError(void);
 extern double CNF_GetMaxDrift(void);
 extern double CNF_GetCorrectionTimeRatio(void);
 extern double CNF_GetMaxSlewRate(void);
 extern double CNF_GetMaxDistance(void);
 extern double CNF_GetMaxJitter(void);
 extern double CNF_GetReselectDistance(void);
 extern double CNF_GetStratumWeight(void);
 extern double CNF_GetCombineLimit(void);
-extern int CNF_AllowLocalReference(int *stratum, int *orphan, double *distance);
+extern int CNF_AllowLocalReference(int *stratum);
 extern void CNF_SetupAccessRestrictions(void);
 extern int CNF_GetSchedPriority(void);
 extern int CNF_GetLockMemory(void);
-extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak);
+extern void CNF_GetTempComp(char **file, double *interval, double *T0, double *k0, double *k1, double *k2);
 extern int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak);
 extern void CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only);
 extern void CNF_GetTempComp(char **file, double *interval, char **point_file, double *T0, double *k0, double *k1, double *k2);
 extern char *CNF_GetUser(void);
 extern int CNF_GetMaxSamples(void);
 extern int CNF_GetMinSamples(void);
 extern int CNF_GetMinSources(void);
 extern double CNF_GetRtcAutotrim(void);
 extern char *CNF_GetHwclockFile(void);
 extern int CNF_GetInitSources(void);
 extern double CNF_GetInitStepThreshold(void);
 typedef enum {
  CNF_HWTS_RXFILTER_ANY,
  CNF_HWTS_RXFILTER_NONE,
  CNF_HWTS_RXFILTER_NTP,
  CNF_HWTS_RXFILTER_ALL,
 } CNF_HwTs_RxFilter;
 typedef struct {
  char *name;
  int minpoll;
  int min_samples;
  int max_samples;
  int nocrossts;
  CNF_HwTs_RxFilter rxfilter;
  double precision;
  double tx_comp;
  double rx_comp;
 } CNF_HwTsInterface;
 extern int CNF_GetHwTsInterface(unsigned int index, CNF_HwTsInterface **iface);
 #endif /* GOT_CONF_H */
--- a/613
+++ b/613
@@ -4,14 +4,34 @@
 # chronyd/chronyc - Programs for keeping computer clocks accurate.
 #
 # Copyright (C) Richard P. Curnow  1997-2003
-# Copyright (C) Bryan Christianson  2016
+# Copyright (C) Miroslav Lichvar  2009, 2012-2014
 # Copyright (C) Miroslav Lichvar  2009, 2012-2018
 # Copyright (C) Stefan R. Filipek  2019
 #
 # =======================================================================
 rm -f config.h config.log
 # This configure script determines the operating system type and version
 if [ "x${CC}" = "x" ]; then
  MYCC="gcc"
 else
  MYCC="${CC}"
 fi
 if [ "x${CFLAGS}" = "x" ]; then
  MYCFLAGS="-O2 -g"
 else
  MYCFLAGS="${CFLAGS}"
 fi
 MYCPPFLAGS="${CPPFLAGS}"
 if [ "x${MYCC}" = "xgcc" ]; then
  MYCFLAGS="${MYCFLAGS} -Wmissing-prototypes -Wall"
 fi
 MYLDFLAGS="${LDFLAGS}"
 # ======================================================================
 # FUNCTIONS
@@ -23,10 +43,9 @@ test_code () {
  ldflags=$4
  code=$5
-  printf "%s" "Checking for $name : "
+  echo -n "Checking for $name : "
  (
    echo "#include \"config.h\""
    for h in $headers; do
      echo "#include <$h>"
    done
@@ -82,35 +101,22 @@ For better control, use the options below.
  --disable-readline     Disable line editing support
  --without-readline     Don't use GNU readline even if it is available
  --without-editline     Don't use editline even if it is available
-  --with-readline-includes=DIR Specify where readline include directory is
+  --readline-dir=DIR     Specify parent of readline include and lib directories
-  --with-readline-library=DIR Specify where readline lib directory is
+  --readline-inc-dir=DIR Specify where readline include directory is
  --readline-lib-dir=DIR Specify where readline lib directory is
  --with-ncurses-library=DIR Specify where ncurses lib directory is
  --disable-sechash      Disable support for hashes other than MD5
  --without-nettle       Don't use nettle even if it is available
  --without-nss          Don't use NSS even if it is available
  --without-tomcrypt     Don't use libtomcrypt even if it is available
  --disable-cmdmon       Disable command and monitoring support
  --disable-ntp          Disable NTP support
  --disable-refclock     Disable reference clock support
  --disable-phc          Disable PHC refclock driver
  --disable-pps          Disable PPS refclock driver
  --disable-ipv6         Disable IPv6 support
  --disable-phc          Disable PHC support
  --disable-pps          Disable PPS API support
  --disable-rtc          Don't include RTC even on Linux
-  --disable-privdrop     Disable support for dropping root privileges
+  --disable-linuxcaps    Disable Linux capabilities support
  --without-libcap       Don't use libcap even if it is available
  --enable-scfilter      Enable support for system call filtering
  --without-seccomp      Don't use seccomp even if it is available
  --disable-asyncdns     Disable asynchronous name resolving
  --disable-forcednsretry Don't retry on permanent DNS error
  --without-clock-gettime Don't use clock_gettime() even if it is available
  --disable-timestamping Disable support for SW/HW timestamping
  --enable-ntp-signd     Enable support for MS-SNTP authentication in Samba
  --with-ntp-era=SECONDS Specify earliest assumed NTP time in seconds
                         since 1970-01-01 [50*365 days ago]
  --with-user=USER       Specify default chronyd user [root]
  --with-hwclockfile=PATH Specify default path to hwclock(8) adjtime file
  --with-pidfile=PATH    Specify default pidfile [/var/run/chrony/chronyd.pid]
  --with-rtcdevice=PATH  Specify default path to RTC device [/dev/rtc]
  --with-sendmail=PATH   Path to sendmail binary [/usr/lib/sendmail]
  --enable-debug         Enable debugging support
@@ -119,10 +125,10 @@ Fine tuning of the installation directories:
  --bindir=DIR           user executables [EPREFIX/bin]
  --sbindir=DIR          system admin executables [EPREFIX/sbin]
  --datarootdir=DIR      data root [PREFIX/share]
  --infodir=DIR          info documentation [DATAROOTDIR/info]
  --mandir=DIR           man documentation [DATAROOTDIR/man]
  --docdir=DIR           documentation root [DATAROOTDIR/doc/chrony]
  --localstatedir=DIR    modifiable single-machine data [/var]
  --chronyrundir=DIR     location for chrony sockets [LOCALSTATEDIR/run/chrony]
  --chronyvardir=DIR     location for chrony data [LOCALSTATEDIR/lib/chrony]
 Overriding system detection when cross-compiling:
@@ -161,22 +167,6 @@ pkg_config () {
  pkg-config $@ 2> /dev/null
 }
 #}}}
 #{{{ get_features
 get_features () {
  ff=1
  for f; do
    if [ "$ff" = "0" ]; then
      printf " "
    fi
    if grep "define FEAT_$f" config.h > /dev/null; then
      printf "%s" "+$f"
    else
      printf "%s" "-$f"
    fi
    ff=0
  done
 }
 #}}}
 # ======================================================================
@@ -192,25 +182,16 @@ EXTRA_OBJECTS=""
 EXTRA_DEFS=""
 SYSDEFS=""
-feat_debug=0
+debug=0
 feat_cmdmon=1
 feat_ntp=1
 feat_refclock=1
 feat_readline=1
 try_readline=1
 try_editline=1
 feat_sechash=1
 try_nettle=1
 try_nss=1
 try_tomcrypt=1
 feat_rtc=1
 try_rtc=0
-feat_droproot=1
+feat_linuxcaps=1
-try_libcap=-1
+try_linuxcaps=0
 try_clockctl=0
 feat_scfilter=0
 try_seccomp=-1
 priv_ops=""
 readline_lib=""
 readline_inc=""
 ncurses_lib=""
@@ -222,24 +203,15 @@ try_setsched=0
 try_lockmem=0
 feat_asyncdns=1
 feat_forcednsretry=1
 try_clock_gettime=1
 try_recvmmsg=1
 feat_timestamping=1
 try_timestamping=0
 feat_ntp_signd=0
 ntp_era_split=""
 use_pthread=0
 default_user="root"
 default_hwclockfile=""
 default_pidfile="/var/run/chrony/chronyd.pid"
 default_rtcdevice="/dev/rtc"
 mail_program="/usr/lib/sendmail"
 for option
 do
    case "$option" in
    --enable-debug )
-      feat_debug=1
+      debug=1
    ;;
    --disable-readline )
      feat_readline=0
@@ -277,6 +249,9 @@ do
    --datarootdir=* )
      SETDATAROOTDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --infodir=* )
      SETINFODIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --mandir=* )
      SETMANDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
@@ -286,21 +261,9 @@ do
    --localstatedir=* )
      SETLOCALSTATEDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --chronyrundir=* | --chronysockdir=* )
      SETCHRONYRUNDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --chronyvardir=* )
      SETCHRONYVARDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --disable-cmdmon)
      feat_cmdmon=0
    ;;
    --disable-ntp)
      feat_ntp=0
    ;;
    --disable-refclock)
      feat_refclock=0
    ;;
    --disable-rtc)
      feat_rtc=0
    ;;
@@ -313,20 +276,8 @@ do
    --disable-pps)
      feat_pps=0
    ;;
-    --disable-privdrop)
+    --disable-linuxcaps)
-      feat_droproot=0
+      feat_linuxcaps=0
    ;;
    --without-libcap|--disable-linuxcaps)
      try_libcap=0
    ;;
    --enable-scfilter)
      feat_scfilter=1
    ;;
    --disable-scfilter)
      feat_scfilter=0
    ;;
    --without-seccomp)
      try_seccomp=0
    ;;
    --disable-asyncdns)
      feat_asyncdns=0
@@ -334,39 +285,15 @@ do
    --disable-forcednsretry)
      feat_forcednsretry=0
    ;;
    --without-clock-gettime)
      try_clock_gettime=0
    ;;
    --disable-timestamping)
      feat_timestamping=0
    ;;
    --enable-ntp-signd)
      feat_ntp_signd=1
    ;;
    --with-ntp-era=* )
      ntp_era_split=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-user=* )
      default_user=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-hwclockfile=* )
      default_hwclockfile=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-pidfile=* )
      default_pidfile=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-rtcdevice=* )
      default_rtcdevice=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-sendmail=* )
      mail_program=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --disable-sechash )
      feat_sechash=0
    ;;
    --without-nettle )
      try_nettle=0
    ;;
    --without-nss )
      try_nss=0
    ;;
@@ -391,168 +318,77 @@ do
    esac
 done
 rm -f config.h config.log
 SYSTEM=${OPERATINGSYSTEM}-${MACHINE}
-case $OPERATINGSYSTEM in
+case $SYSTEM in
-    Linux)
+    SunOS-sun4* )
-        EXTRA_OBJECTS="sys_generic.o sys_linux.o sys_timex.o sys_posix.o"
+    case $VERSION in
-        [ $try_libcap != "0" ] && try_libcap=1
+        4.* )
            EXTRA_OBJECTS="sys_sunos.o strerror.o"
            EXTRA_LIBS="-lkvm"
            add_def SUNOS
            echo "Configuring for SunOS (" $SYSTEM "version" $VERSION ")"
        ;;
        5.* )
            EXTRA_OBJECTS="sys_solaris.o"
            EXTRA_LIBS="-lsocket -lnsl -lkvm -lelf"
            EXTRA_CLI_LIBS="-lsocket -lnsl"
            add_def SOLARIS
            echo "Configuring for Solaris (" $SYSTEM "SunOS version" $VERSION ")"
        ;;
    esac
    ;;
    Linux* )
        EXTRA_OBJECTS="sys_generic.o sys_linux.o wrap_adjtimex.o"
        try_linuxcaps=1
        try_rtc=1
        [ $try_seccomp != "0" ] && try_seccomp=1
        try_timestamping=1
        try_setsched=1
        try_lockmem=1
        try_phc=1
        add_def LINUX
        echo "Configuring for " $SYSTEM
-    ;;
+        if [ "${MACHINE}" = "alpha" ]; then
-    FreeBSD)
+           echo "Enabling -mieee"
-        # recvmmsg() seems to be broken on FreeBSD 11.0 and it's just
+           # FIXME: Should really test for GCC
-        # a wrapper around recvmsg()
+           MYCFLAGS="$MYCFLAGS -mieee"
        try_recvmmsg=0
        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o sys_posix.o"
        try_setsched=1
        try_lockmem=1
        add_def FREEBSD
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIME ADJUSTTIMEX SETTIME BINDSOCKET"
        fi
    ;;
    BSD/386-i[3456]86|FreeBSD-i386|FreeBSD-amd64 )
        # Antti Jrvinen <costello@iki.fi> reported that this system can
        # be supported with the SunOS 4.x driver files.
        EXTRA_OBJECTS="sys_sunos.o strerror.o"
        EXTRA_LIBS="-lkvm"
        add_def SUNOS
        echo "Configuring for $SYSTEM (using SunOS driver)"
    ;;
    NetBSD-* )
        EXTRA_OBJECTS="sys_netbsd.o"
        EXTRA_LIBS="-lkvm"
        SYSDEFS=""
        echo "Configuring for $SYSTEM"
    ;;
-    NetBSD)
+    SunOS-i86pc* )                                          
-        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o sys_posix.o"
+        # Doug Woodward <dougw@whistler.com> reported that this configuration
-        try_clockctl=1
+        # works for Solaris 2.8 / SunOS 5.8 on x86 platforms
-        try_setsched=1
+        EXTRA_OBJECTS="sys_solaris.o"                
-        try_lockmem=1
+        EXTRA_LIBS="-lsocket -lnsl -lkvm -lelf"      
-        add_def NETBSD
+        EXTRA_CLI_LIBS="-lsocket -lnsl"                              
        echo "Configuring for $SYSTEM"
    ;;
    Darwin)
        EXTRA_OBJECTS="sys_macosx.o"
        EXTRA_LIBS="-lresolv"
        EXTRA_CLI_LIBS="-lresolv"
        add_def MACOSX
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIME SETTIME BINDSOCKET"
        fi
        major=`echo $VERSION | cut -d. -f1`
        # ntp_adjtime is not available in macOS 10.12 (Darwin 16.x.x) and earlier
        if [ $major -gt "16" ]; then
          add_def HAVE_MACOS_SYS_TIMEX
          EXTRA_OBJECTS="$EXTRA_OBJECTS sys_generic.o sys_netbsd.o sys_timex.o"
          if [ $feat_droproot = "1" ]; then
            priv_ops="$priv_ops ADJUSTTIMEX"
          fi
        fi
        echo "Configuring for macOS (" $SYSTEM "macOS version" $VERSION ")"
    ;;
    SunOS)
        EXTRA_OBJECTS="sys_generic.o sys_solaris.o sys_timex.o sys_posix.o"
        EXTRA_LIBS="-lsocket -lnsl -lresolv"
        EXTRA_CLI_LIBS="-lsocket -lnsl -lresolv"
        try_setsched=1
        try_lockmem=1
        add_def SOLARIS
        # These are needed to have msg_control in struct msghdr
        add_def __EXTENSIONS__
        add_def _XOPEN_SOURCE 1
        add_def _XOPEN_SOURCE_EXTENDED 1
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIMEX SETTIME BINDSOCKET"
        fi
        echo "Configuring for Solaris (" $SYSTEM "SunOS version" $VERSION ")" 
    ;;                                                                        
    CYGWIN32_NT-i[3456]86 )
        EXTRA_OBJECTS="sys_winnt.o"
        EXTRA_LIBS=""
        add_def WINNT
        echo "Configuring for Windows NT (Cygwin32)"
    ;;
    * )
-        echo "error: $SYSTEM is not supported (yet?)"
+        echo "Sorry, I don't know how to build this software on your system."
        exit 1
    ;;
 esac
 if [ $feat_debug = "1" ]; then
  add_def FEAT_DEBUG
 fi
 add_def DEBUG $feat_debug
 if [ $feat_cmdmon = "1" ]; then
  add_def FEAT_CMDMON
  EXTRA_OBJECTS="$EXTRA_OBJECTS cmdmon.o manual.o pktlength.o"
 fi
 if [ $feat_ntp = "1" ]; then
  add_def FEAT_NTP
  EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_core.o ntp_io.o ntp_sources.o"
  if [ $feat_ntp_signd = "1" ]; then
    add_def FEAT_SIGND
    EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_signd.o"
  fi
 else
  feat_asyncdns=0
  feat_timestamping=0
 fi
 if [ "$feat_cmdmon" = "1" ] || [ $feat_ntp = "1" ]; then
  EXTRA_OBJECTS="$EXTRA_OBJECTS addrfilt.o clientlog.o keys.o nameserv.o"
 else
  feat_ipv6=0
 fi
 if [ $feat_refclock = "1" ]; then
  add_def FEAT_REFCLOCK
  EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o refclock_shm.o refclock_sock.o"
 fi
 MYCC="$CC"
 MYCFLAGS="$CFLAGS"
 MYCPPFLAGS="$CPPFLAGS"
 MYLDFLAGS="$LDFLAGS"
 if [ "x$MYCC" = "x" ]; then
  for cc in gcc clang cc ""; do
    if [ "x$cc" = "x" ]; then
      echo "error: no C compiler found"
      exit 1
    fi
    MYCC=$cc
    if test_code "$MYCC" '' '' '' ''; then
      break
    fi
  done
 else
  if ! test_code "$MYCC" '' '' '' ''; then
    echo "error: C compiler $MYCC cannot create executables"
    exit 1
  fi
 fi
 if [ "x$MYCFLAGS" = "x" ]; then
  MYCFLAGS="-O2 -g"
  TESTCFLAGS="-D_FORTIFY_SOURCE=2 -fPIE"
  TESTLDFLAGS="-pie -Wl,-z,relro,-z,now"
  if test_code 'hardening compiler options' '' "$TESTCFLAGS" "$TESTLDFLAGS" ''; then
    MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
    MYLDFLAGS="$MYLDFLAGS $TESTLDFLAGS"
  fi
  TESTCFLAGS="-fstack-protector-strong --param=ssp-buffer-size=4"
  if test_code '-fstack-protector-strong' '' "$TESTCFLAGS" '' ''; then
    MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
  else
    TESTCFLAGS="-fstack-protector --param=ssp-buffer-size=4"
    if test_code '-fstack-protector' '' "$TESTCFLAGS" '' ''; then
      MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
    fi
  fi
 fi
 if [ "x$MYCC" = "xgcc" ] || [ "x$MYCC" = "xclang" ]; then
  MYCFLAGS="$MYCFLAGS -Wmissing-prototypes -Wall"
 fi
 if test_code '64-bit time_t' 'time.h' '' '' '
  char x[sizeof(time_t) > 4 ? 1 : -1] = {0};
  return x[0];'
@@ -562,14 +398,10 @@ then
  if [ "x$ntp_era_split" != "x" ]; then
    split_seconds=$ntp_era_split
    split_days=0
  else
    if [ "x$SOURCE_DATE_EPOCH" != "x" ]; then
      split_seconds=$SOURCE_DATE_EPOCH
  else
    split_seconds=`date '+%s'`
-    fi
+    if [ "x$split_seconds" = "" ]; then
-    if [ "x$split_seconds" = "x" ]; then
+      echo "Could not get current time, --with-ntp-era option is needed"
      echo "error: could not get current time, --with-ntp-era option is needed"
      exit 1
    fi
    split_days=$((50 * 365))
@@ -598,33 +430,34 @@ else
  if test_code 'math in -lm' 'math.h' '' '-lm' "$MATHCODE"; then
    LIBS="-lm"
  else
-    echo "error: could not compile/link a program which uses sqrt(), log(), pow()"
+    echo "Can't compile/link a program which uses sqrt(), log(), pow(), bailing out"
    exit 1
  fi
 fi
-if test_code 'struct in_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
+if test_code '<stdint.h>' 'stdint.h' '' '' ''; then
-  struct in_pktinfo ipi;
+  add_def HAS_STDINT_H
-  return sizeof (ipi.ipi_spec_dst.s_addr) + IP_PKTINFO;'
+fi
-then
+
-  add_def HAVE_IN_PKTINFO
+if test_code '<inttypes.h>' 'inttypes.h' '' '' ''; then
  add_def HAS_INTTYPES_H
 fi
 if [ $feat_ipv6 = "1" ] && \
-  test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' "$EXTRA_LIBS" '
+  test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' '' '
    struct sockaddr_in6 n;
    char p[100];
    n.sin6_addr = in6addr_any;
    return !inet_ntop(AF_INET6, &n.sin6_addr.s6_addr, p, sizeof(p));'
 then
-  add_def FEAT_IPV6
+  add_def HAVE_IPV6
-  if test_code 'struct in6_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
+  if test_code 'in6_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
-    return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
+    return sizeof(struct in6_pktinfo);'
  then
    add_def HAVE_IN6_PKTINFO
  else
-    if test_code 'struct in6_pktinfo with _GNU_SOURCE' 'sys/socket.h netinet/in.h' \
+    if test_code 'in6_pktinfo with _GNU_SOURCE' 'sys/socket.h netinet/in.h' \
-      '-D_GNU_SOURCE' '' 'return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
+      '-D_GNU_SOURCE' '' 'return sizeof(struct in6_pktinfo);'
    then
      add_def _GNU_SOURCE
      add_def HAVE_IN6_PKTINFO
@@ -632,22 +465,7 @@ then
  fi
 fi
-if [ $try_clock_gettime = "1" ]; then
+if test_code 'getaddrinfo()' 'sys/types.h sys/socket.h netdb.h' '' '' \
  if test_code 'clock_gettime()' 'time.h' '' '' \
    'clock_gettime(CLOCK_REALTIME, NULL);'
  then
    add_def HAVE_CLOCK_GETTIME
  else
    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
      'clock_gettime(CLOCK_REALTIME, NULL);'
    then
      add_def HAVE_CLOCK_GETTIME
      EXTRA_LIBS="$EXTRA_LIBS -lrt"
    fi
  fi
 fi
 if test_code 'getaddrinfo()' 'sys/types.h sys/socket.h netdb.h' '' "$EXTRA_LIBS" \
  'return getaddrinfo(0, 0, 0, 0);'
 then
  add_def HAVE_GETADDRINFO
@@ -655,71 +473,20 @@ fi
 if [ $feat_asyncdns = "1" ] && \
  test_code 'pthread' 'pthread.h' '-pthread' '' \
-    'return (int)pthread_create((void *)1, NULL, (void *)1, NULL);'
+    'return pthread_create((void *)1, NULL, (void *)1, NULL);'
 then
  add_def FEAT_ASYNCDNS
  add_def USE_PTHREAD_ASYNCDNS
-  EXTRA_OBJECTS="$EXTRA_OBJECTS nameserv_async.o"
+  MYCFLAGS="$MYCFLAGS -pthread"
  use_pthread=1
 fi
 if test_code 'arc4random_buf()' 'stdlib.h' '' '' 'arc4random_buf(NULL, 0);'; then
  add_def HAVE_ARC4RANDOM
 fi
 if test_code 'getrandom()' 'stdlib.h sys/random.h' '' '' \
    'return getrandom(NULL, 256, 0);'; then
  add_def HAVE_GETRANDOM
 fi
 RECVMMSG_CODE='
  struct mmsghdr hdr;
  return !recvmmsg(0, &hdr, 1, MSG_DONTWAIT, 0);'
 if [ $try_recvmmsg = "1" ]; then
  if test_code 'recvmmsg()' 'sys/socket.h' '' "$EXTRA_LIBS" "$RECVMMSG_CODE"; then
    add_def HAVE_RECVMMSG
  else
    if test_code 'recvmmsg() with _GNU_SOURCE' 'sys/socket.h' '-D_GNU_SOURCE' \
      "$EXTRA_LIBS" "$RECVMMSG_CODE"
    then
      add_def _GNU_SOURCE
      add_def HAVE_RECVMMSG
    fi
  fi
 fi
 if [ $feat_timestamping = "1" ] && [ $try_timestamping = "1" ] &&
  test_code 'SW/HW timestamping' 'sys/types.h sys/socket.h linux/net_tstamp.h
                                  linux/errqueue.h linux/ptp_clock.h' '' '' '
    int val = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE |
              SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_OPT_CMSG;
    return sizeof (struct scm_timestamping) + SCM_TSTAMP_SND + PTP_SYS_OFFSET +
           setsockopt(0, SOL_SOCKET, SO_SELECT_ERR_QUEUE + SO_TIMESTAMPING,
                      &val, sizeof (val));'
 then
  add_def HAVE_LINUX_TIMESTAMPING
  EXTRA_OBJECTS="$EXTRA_OBJECTS hwclock.o ntp_io_linux.o"
  if test_code 'other timestamping options' \
    'sys/types.h sys/socket.h linux/net_tstamp.h' '' '' '
    struct scm_ts_pktinfo pktinfo;
    pktinfo.if_index = pktinfo.pkt_length = 0;
    return pktinfo.if_index + pktinfo.pkt_length + HWTSTAMP_FILTER_NTP_ALL +
           SCM_TIMESTAMPING_PKTINFO +
           SOF_TIMESTAMPING_OPT_PKTINFO + SOF_TIMESTAMPING_OPT_TX_SWHW;'; then
    add_def HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP 1
    add_def HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO 1
    add_def HAVE_LINUX_TIMESTAMPING_OPT_TX_SWHW 1
  fi
 fi
 timepps_h=""
-if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
+if [ $feat_pps = "1" ]; then
-  if test_code '<sys/timepps.h>' 'inttypes.h time.h sys/timepps.h' '' '' ''; then
+  if test_code '<sys/timepps.h>' 'sys/timepps.h' '' '' ''; then
    timepps_h="sys/timepps.h"
    add_def HAVE_SYS_TIMEPPS_H
  else
-    if test_code '<timepps.h>' 'inttypes.h time.h timepps.h' '' '' ''; then
+    if test_code '<timepps.h>' 'timepps.h' '' '' ''; then
      timepps_h="timepps.h"
      add_def HAVE_TIMEPPS_H
    fi
@@ -727,53 +494,26 @@ if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
 fi
 if [ "x$timepps_h" != "x" ] && \
-  test_code 'PPSAPI' "inttypes.h string.h time.h $timepps_h" '' '' '
+  test_code 'PPSAPI' "string.h $timepps_h" '' '' '
    pps_handle_t h = 0;
    pps_info_t i;
    struct timespec ts;
    return time_pps_fetch(h, PPS_TSFMT_TSPEC, &i, &ts);'
 then
-  add_def FEAT_PPS
+  add_def HAVE_PPSAPI
 fi
-if [ $feat_droproot = "1" ] && [ $try_libcap = "1" ] && \
+if [ $feat_linuxcaps = "1" ] && [ $try_linuxcaps = "1" ] && \
  test_code \
-    libcap \
+    linuxcaps \
    'sys/types.h pwd.h sys/prctl.h sys/capability.h grp.h' \
    '' '-lcap' \
    'prctl(PR_SET_KEEPCAPS, 1);cap_set_proc(cap_from_text("cap_sys_time=ep"));'
 then
-    add_def FEAT_PRIVDROP
+    add_def FEAT_LINUXCAPS
    EXTRA_LIBS="$EXTRA_LIBS -lcap"
 fi
 if [ $feat_droproot = "1" ] && [ $try_clockctl = "1" ] && \
  test_code '<sys/clockctl.h>' 'sys/clockctl.h' '' '' ''
 then
  add_def FEAT_PRIVDROP
  priv_ops="BINDSOCKET"
 fi
 if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
  test_code seccomp 'seccomp.h' '' '-lseccomp' \
    'seccomp_init(SCMP_ACT_KILL);'
 then
  add_def FEAT_SCFILTER
  # NAME2IPADDRESS shouldn't be enabled with other operations as the helper
  # process works on one request at the time and the async resolver could
  # block the main thread
  priv_ops="NAME2IPADDRESS RELOADDNS"
  EXTRA_LIBS="$EXTRA_LIBS -lseccomp"
 fi
 if [ "x$priv_ops" != "x" ]; then
  EXTRA_OBJECTS="$EXTRA_OBJECTS privops.o"
  add_def PRIVOPS_HELPER
  for o in $priv_ops; do
    add_def PRIVOPS_$o
  done
 fi
 if [ $feat_rtc = "1" ] && [ $try_rtc = "1" ] && \
  test_code '<linux/rtc.h>' 'sys/ioctl.h linux/rtc.h' '' '' \
    'ioctl(1, RTC_UIE_ON&RTC_UIE_OFF&RTC_RD_TIME&RTC_SET_TIME, 0&RTC_UF);'
@@ -782,51 +522,50 @@ then
    add_def FEAT_RTC
 fi
-if [ $feat_refclock = "1" ] && [ $feat_phc = "1" ] && [ $try_phc = "1" ] && \
+if [ $feat_phc = "1" ] && [ $try_phc = "1" ] && \
  grep '#define HAVE_CLOCK_GETTIME' config.h > /dev/null && \
  test_code '<linux/ptp_clock.h>' 'sys/ioctl.h linux/ptp_clock.h' '' '' \
-    'ioctl(1, PTP_CLOCK_GETCAPS + PTP_SYS_OFFSET, 0);'
+    'ioctl(1, PTP_CLOCK_GETCAPS, 0);'
 then
-  grep 'HAVE_LINUX_TIMESTAMPING' config.h > /dev/null ||
+  if test_code 'clock_gettime()' 'time.h' '' '' 'clock_gettime(0, NULL);'; then
    EXTRA_OBJECTS="$EXTRA_OBJECTS hwclock.o"
    add_def FEAT_PHC
  else
    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
      'clock_gettime(0, NULL);'
    then
      EXTRA_LIBS="$EXTRA_LIBS -lrt"
      add_def FEAT_PHC
    fi
  fi
 fi
 if [ $try_setsched = "1" ] && \
  test_code \
-    'pthread_setschedparam()' \
+    'sched_setscheduler()' \
-    'pthread.h sched.h' '-pthread' '' '
+    'sched.h' '' '' '
     struct sched_param sched;
     sched_get_priority_max(SCHED_FIFO);
-     pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched);'
+     sched_setscheduler(0, SCHED_FIFO, &sched);'
 then
-  add_def HAVE_PTHREAD_SETSCHEDPARAM
+  add_def HAVE_SCHED_SETSCHEDULER
  use_pthread=1
 fi
 if [ $try_lockmem = "1" ] && \
  test_code \
    'mlockall()' \
-    'sys/mman.h' '' '' '
+    'sys/mman.h sys/resource.h' '' '' '
     struct rlimit rlim;
     setrlimit(RLIMIT_MEMLOCK, &rlim);
     mlockall(MCL_CURRENT|MCL_FUTURE);'
 then
  add_def HAVE_MLOCKALL
 fi
 if [ $try_lockmem = "1" ] && \
  test_code \
    'setrlimit(RLIMIT_MEMLOCK, ...)' \
    'sys/resource.h' '' '' '
     struct rlimit rlim;
     setrlimit(RLIMIT_MEMLOCK, &rlim);'
 then
  add_def HAVE_SETRLIMIT_MEMLOCK
 fi
 if [ $feat_forcednsretry = "1" ]
 then
  add_def FORCE_DNSRETRY
 fi
 READLINE_COMPILE=""
 READLINE_LINK=""
 if [ $feat_readline = "1" ]; then
  if [ $try_editline = "1" ]; then
@@ -836,7 +575,7 @@ if [ $feat_readline = "1" ]; then
    then
      add_def FEAT_READLINE
      add_def USE_EDITLINE
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
+      READLINE_COMPILE="$readline_inc"
      READLINE_LINK="$readline_lib -ledit"
    fi
  fi
@@ -847,7 +586,7 @@ if [ $feat_readline = "1" ]; then
      'add_history(readline("prompt"));'
    then
      add_def FEAT_READLINE
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
+      READLINE_COMPILE="$readline_inc"
      READLINE_LINK="$readline_lib -lreadline"
    fi
  fi
@@ -859,7 +598,7 @@ if [ $feat_readline = "1" ]; then
      'add_history(readline("prompt"));'
    then
      add_def FEAT_READLINE
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
+      READLINE_COMPILE="$readline_inc"
      READLINE_LINK="$readline_lib $ncurses_lib -lreadline -lncurses"
    fi
  fi
@@ -868,24 +607,10 @@ if [ $feat_readline = "1" ]; then
 fi
 HASH_OBJ="hash_intmd5.o"
 HASH_COMPILE=""
 HASH_LINK=""
-if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nettle = "1" ]; then
+if [ $try_nss = "1" ]; then
  test_cflags="`pkg_config --cflags nettle`"
  test_link="`pkg_config --libs nettle`"
  if test_code 'nettle' 'nettle/nettle-meta.h nettle/sha2.h' \
    "$test_cflags" "$test_link" \
    'return nettle_hashes[0]->context_size;'
  then
    HASH_OBJ="hash_nettle.o"
    HASH_LINK="$test_link"
    LIBS="$LIBS $HASH_LINK"
    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
    add_def FEAT_SECHASH
  fi
 fi
 if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nss = "1" ]; then
  test_cflags="`pkg_config --cflags nss`"
  test_link="`pkg_config --libs-only-L nss` -lfreebl3"
  if test_code 'NSS' 'nss.h hasht.h nsslowhash.h' \
@@ -893,29 +618,25 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nss = "1" ]; th
    'NSSLOWHASH_Begin(NSSLOWHASH_NewContext(NSSLOW_Init(), HASH_AlgSHA512));'
  then
    HASH_OBJ="hash_nss.o"
    HASH_COMPILE="$test_cflags"
    HASH_LINK="$test_link"
    LIBS="$LIBS $HASH_LINK"
-    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
+    add_def GENERATE_SHA1_KEY
    add_def FEAT_SECHASH
  fi
 fi
-if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]; then
+if [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]; then
  if test_code 'tomcrypt' 'tomcrypt.h' '-I/usr/include/tomcrypt' '-ltomcrypt' \
    'hash_memory_multi(find_hash("md5"), NULL, NULL, NULL, 0, NULL, 0);'
  then
    HASH_OBJ="hash_tomcrypt.o"
    HASH_COMPILE="-I/usr/include/tomcrypt"
    HASH_LINK="-ltomcrypt"
    LIBS="$LIBS $HASH_LINK"
-    MYCPPFLAGS="$MYCPPFLAGS -I/usr/include/tomcrypt"
+    add_def GENERATE_SHA1_KEY
    add_def FEAT_SECHASH
  fi
 fi
 if [ $use_pthread = "1" ]; then
  MYCFLAGS="$MYCFLAGS -pthread"
 fi
 SYSCONFDIR=/etc
 if [ "x$SETSYSCONFDIR" != "x" ]; then
  SYSCONFDIR=$SETSYSCONFDIR
@@ -946,6 +667,11 @@ if [ "x$SETDATAROOTDIR" != "x" ]; then
  DATAROOTDIR=$SETDATAROOTDIR
 fi
 INFODIR=${DATAROOTDIR}/info
 if [ "x$SETINFODIR" != "x" ]; then
  INFODIR=$SETINFODIR
 fi
 MANDIR=${DATAROOTDIR}/man
 if [ "x$SETMANDIR" != "x" ]; then
  MANDIR=$SETMANDIR
@@ -961,40 +687,23 @@ if [ "x$SETLOCALSTATEDIR" != "x" ]; then
  LOCALSTATEDIR=$SETLOCALSTATEDIR
 fi
 CHRONYRUNDIR=${LOCALSTATEDIR}/run/chrony
 if [ "x$SETCHRONYRUNDIR" != "x" ]; then
  CHRONYRUNDIR=$SETCHRONYRUNDIR
 fi
 CHRONYVARDIR=${LOCALSTATEDIR}/lib/chrony
 if [ "x$SETCHRONYVARDIR" != "x" ]; then
  CHRONYVARDIR=$SETCHRONYVARDIR
 fi
 add_def DEBUG $debug
 add_def DEFAULT_CONF_FILE "\"$SYSCONFDIR/chrony.conf\""
 add_def DEFAULT_HWCLOCK_FILE "\"$default_hwclockfile\""
 add_def DEFAULT_PID_FILE "\"$default_pidfile\""
 add_def DEFAULT_RTC_DEVICE "\"$default_rtcdevice\""
 add_def DEFAULT_USER "\"$default_user\""
 add_def DEFAULT_COMMAND_SOCKET "\"$CHRONYRUNDIR/chronyd.sock\""
 add_def MAIL_PROGRAM "\"$mail_program\""
 common_features="`get_features SECHASH IPV6 DEBUG`"
 chronyc_features="`get_features READLINE`"
 chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SIGND ASYNCDNS`"
 add_def CHRONYC_FEATURES "\"$chronyc_features $common_features\""
 add_def CHRONYD_FEATURES "\"$chronyd_features $common_features\""
 echo "Features : $chronyd_features $chronyc_features $common_features"
 if [ -f version.txt ]; then
-  CHRONY_VERSION="`cat version.txt`"
+  add_def CHRONY_VERSION "\"`cat version.txt`\""
 else
-  CHRONY_VERSION="DEVELOPMENT"
+  add_def CHRONY_VERSION "\"DEVELOPMENT\""
 fi
-add_def CHRONY_VERSION "\"${CHRONY_VERSION}\""
+for f in Makefile chrony.conf.5 chrony.texi chronyc.1 chronyd.8
 for f in Makefile doc/Makefile test/unit/Makefile
 do
  echo Creating $f
  sed -e "s%@EXTRA_OBJECTS@%${EXTRA_OBJECTS}%;\
@@ -1005,20 +714,18 @@ do
          s%@LDFLAGS@%${MYLDFLAGS}%;\
          s%@EXTRA_LIBS@%${EXTRA_LIBS}%;\
          s%@EXTRA_CLI_LIBS@%${EXTRA_CLI_LIBS}%;\
          s%@READLINE_COMPILE@%${READLINE_COMPILE}%;\
          s%@HASH_OBJ@%${HASH_OBJ}%;\
          s%@HASH_COMPILE@%${HASH_COMPILE}%;\
          s%@SYSCONFDIR@%${SYSCONFDIR}%;\
          s%@BINDIR@%${BINDIR}%;\
          s%@SBINDIR@%${SBINDIR}%;\
          s%@DOCDIR@%${DOCDIR}%;\
          s%@MANDIR@%${MANDIR}%;\
          s%@INFODIR@%${INFODIR}%;\
          s%@LOCALSTATEDIR@%${LOCALSTATEDIR}%;\
          s%@CHRONYRUNDIR@%${CHRONYRUNDIR}%;\
          s%@CHRONYVARDIR@%${CHRONYVARDIR}%;\
-          s%@DEFAULT_HWCLOCK_FILE@%${default_hwclockfile}%;\
+          s%@DEFAULT_USER@%${default_user}%;"\
          s%@DEFAULT_PID_FILE@%${default_pidfile}%;\
          s%@DEFAULT_RTC_DEVICE@%${default_rtcdevice}%;\
          s%@DEFAULT_USER@%${default_user}%;\
          s%@CHRONY_VERSION@%${CHRONY_VERSION}%;" \
          < ${f}.in > $f
 done
--- a/contrib/DNSchrony/COPYING
+++ b/contrib/DNSchrony/COPYING
@@ -0,0 +1,339 @@
 		    GNU GENERAL PUBLIC LICENSE
 		       Version 2, June 1991
 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
 			    Preamble
  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
 License is intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
 the GNU Lesser General Public License instead.)  You can apply it to
 your programs, too.
  When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 this service if you wish), that you receive source code or can get it
 if you want it, that you can change the software or use pieces of it
 in new free programs; and that you know you can do these things.
  To protect your rights, we need to make restrictions that forbid
 anyone to deny you these rights or to ask you to surrender the rights.
 These restrictions translate to certain responsibilities for you if you
 distribute copies of the software, or if you modify it.
  For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must give the recipients all the rights that
 you have.  You must make sure that they, too, receive or can get the
 source code.  And you must show them these terms so they know their
 rights.
  We protect your rights with two steps: (1) copyright the software, and
 (2) offer you this license which gives you legal permission to copy,
 distribute and/or modify the software.
  Also, for each author's protection and ours, we want to make certain
 that everyone understands that there is no warranty for this free
 software.  If the software is modified by someone else and passed on, we
 want its recipients to know that what they have is not the original, so
 that any problems introduced by others will not reflect on the original
 authors' reputations.
  Finally, any free program is threatened constantly by software
 patents.  We wish to avoid the danger that redistributors of a free
 program will individually obtain patent licenses, in effect making the
 program proprietary.  To prevent this, we have made it clear that any
 patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.
 		    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  0. This License applies to any program or other work which contains
 a notice placed by the copyright holder saying it may be distributed
 under the terms of this General Public License.  The "Program", below,
 refers to any such program or work, and a "work based on the Program"
 means either the Program or any derivative work under copyright law:
 that is to say, a work containing the Program or a portion of it,
 either verbatim or with modifications and/or translated into another
 language.  (Hereinafter, translation is included without limitation in
 the term "modification".)  Each licensee is addressed as "you".
 Activities other than copying, distribution and modification are not
 covered by this License; they are outside its scope.  The act of
 running the Program is not restricted, and the output from the Program
 is covered only if its contents constitute a work based on the
 Program (independent of having been made by running the Program).
 Whether that is true depends on what the Program does.
  1. You may copy and distribute verbatim copies of the Program's
 source code as you receive it, in any medium, provided that you
 conspicuously and appropriately publish on each copy an appropriate
 copyright notice and disclaimer of warranty; keep intact all the
 notices that refer to this License and to the absence of any warranty;
 and give any other recipients of the Program a copy of this License
 along with the Program.
 You may charge a fee for the physical act of transferring a copy, and
 you may at your option offer warranty protection in exchange for a fee.
  2. You may modify your copy or copies of the Program or any portion
 of it, thus forming a work based on the Program, and copy and
 distribute such modifications or work under the terms of Section 1
 above, provided that you also meet all of these conditions:
    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.
    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.
    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)
 These requirements apply to the modified work as a whole.  If
 identifiable sections of that work are not derived from the Program,
 and can be reasonably considered independent and separate works in
 themselves, then this License, and its terms, do not apply to those
 sections when you distribute them as separate works.  But when you
 distribute the same sections as part of a whole which is a work based
 on the Program, the distribution of the whole must be on the terms of
 this License, whose permissions for other licensees extend to the
 entire whole, and thus to each and every part regardless of who wrote it.
 Thus, it is not the intent of this section to claim rights or contest
 your rights to work written entirely by you; rather, the intent is to
 exercise the right to control the distribution of derivative or
 collective works based on the Program.
 In addition, mere aggregation of another work not based on the Program
 with the Program (or with a work based on the Program) on a volume of
 a storage or distribution medium does not bring the other work under
 the scope of this License.
  3. You may copy and distribute the Program (or a work based on it,
 under Section 2) in object code or executable form under the terms of
 Sections 1 and 2 above provided that you also do one of the following:
    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,
    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,
    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)
 The source code for a work means the preferred form of the work for
 making modifications to it.  For an executable work, complete source
 code means all the source code for all modules it contains, plus any
 associated interface definition files, plus the scripts used to
 control compilation and installation of the executable.  However, as a
 special exception, the source code distributed need not include
 anything that is normally distributed (in either source or binary
 form) with the major components (compiler, kernel, and so on) of the
 operating system on which the executable runs, unless that component
 itself accompanies the executable.
 If distribution of executable or object code is made by offering
 access to copy from a designated place, then offering equivalent
 access to copy the source code from the same place counts as
 distribution of the source code, even though third parties are not
 compelled to copy the source along with the object code.
  4. You may not copy, modify, sublicense, or distribute the Program
 except as expressly provided under this License.  Any attempt
 otherwise to copy, modify, sublicense or distribute the Program is
 void, and will automatically terminate your rights under this License.
 However, parties who have received copies, or rights, from you under
 this License will not have their licenses terminated so long as such
 parties remain in full compliance.
  5. You are not required to accept this License, since you have not
 signed it.  However, nothing else grants you permission to modify or
 distribute the Program or its derivative works.  These actions are
 prohibited by law if you do not accept this License.  Therefore, by
 modifying or distributing the Program (or any work based on the
 Program), you indicate your acceptance of this License to do so, and
 all its terms and conditions for copying, distributing or modifying
 the Program or works based on it.
  6. Each time you redistribute the Program (or any work based on the
 Program), the recipient automatically receives a license from the
 original licensor to copy, distribute or modify the Program subject to
 these terms and conditions.  You may not impose any further
 restrictions on the recipients' exercise of the rights granted herein.
 You are not responsible for enforcing compliance by third parties to
 this License.
  7. If, as a consequence of a court judgment or allegation of patent
 infringement or for any other reason (not limited to patent issues),
 conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License.  If you cannot
 distribute so as to satisfy simultaneously your obligations under this
 License and any other pertinent obligations, then as a consequence you
 may not distribute the Program at all.  For example, if a patent
 license would not permit royalty-free redistribution of the Program by
 all those who receive copies directly or indirectly through you, then
 the only way you could satisfy both it and this License would be to
 refrain entirely from distribution of the Program.
 If any portion of this section is held invalid or unenforceable under
 any particular circumstance, the balance of the section is intended to
 apply and the section as a whole is intended to apply in other
 circumstances.
 It is not the purpose of this section to induce you to infringe any
 patents or other property right claims or to contest validity of any
 such claims; this section has the sole purpose of protecting the
 integrity of the free software distribution system, which is
 implemented by public license practices.  Many people have made
 generous contributions to the wide range of software distributed
 through that system in reliance on consistent application of that
 system; it is up to the author/donor to decide if he or she is willing
 to distribute software through any other system and a licensee cannot
 impose that choice.
 This section is intended to make thoroughly clear what is believed to
 be a consequence of the rest of this License.
  8. If the distribution and/or use of the Program is restricted in
 certain countries either by patents or by copyrighted interfaces, the
 original copyright holder who places the Program under this License
 may add an explicit geographical distribution limitation excluding
 those countries, so that distribution is permitted only in or among
 countries not thus excluded.  In such case, this License incorporates
 the limitation as if written in the body of this License.
  9. The Free Software Foundation may publish revised and/or new versions
 of the General Public License from time to time.  Such new versions will
 be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.
 Each version is given a distinguishing version number.  If the Program
 specifies a version number of this License which applies to it and "any
 later version", you have the option of following the terms and conditions
 either of that version or of any later version published by the Free
 Software Foundation.  If the Program does not specify a version number of
 this License, you may choose any version ever published by the Free Software
 Foundation.
  10. If you wish to incorporate parts of the Program into other free
 programs whose distribution conditions are different, write to the author
 to ask for permission.  For software which is copyrighted by the Free
 Software Foundation, write to the Free Software Foundation; we sometimes
 make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
 			    NO WARRANTY
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 REPAIR OR CORRECTION.
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
 		     END OF TERMS AND CONDITIONS
 	    How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 Also add information on how to contact you by electronic and paper mail.
 If the program is interactive, make it output a short notice like this
 when it starts in an interactive mode:
    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, the commands you use may
 be called something other than `show w' and `show c'; they could even be
 mouse-clicks or menu items--whatever suits your program.
 You should also get your employer (if you work as a programmer) or your
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary.  Here is a sample; alter the names:
  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.
  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice
 This General Public License does not permit incorporating your program into
 proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
 library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.
--- a/contrib/DNSchrony/DNSchrony.pl
+++ b/contrib/DNSchrony/DNSchrony.pl
@@ -0,0 +1,583 @@
 #!/usr/bin/perl
 #                Copyright (C) Paul Elliott 2002
 my($copyrighttext) =  <<'EOF';
 #                Copyright (C) Paul Elliott 2002
 #   This program is free software; you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by
 #   the Free Software Foundation; either version 2 of the License, or
 #   (at your option) any later version.
 #
 #   This program is distributed in the hope that it will be useful,
 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #   GNU General Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License
 #   along with this program; if not, write to the Free Software
 #   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #   SEE COPYING FOR DETAILS
 EOF
 #modules we use.
 use Socket;
 use Getopt::Std;
 use Net::DNS;
 use Tie::Syslog;
 use File::Temp qw/ :mktemp  /;
 use File::Copy;
 local($res) = new Net::DNS::Resolver;
 #dns lookup of IP address.
 #returns ip or errorstring.
 sub gethostaddr($)                                 #get ip address from host
 {
  my($host) = shift;
  $query = $res->search($host);
  if ($query) {
    foreach $rr ($query->answer) {
      next unless $rr->type eq "A";
      print $rr->address, "\n" if  $pedebug;
      return $rr->address;
    }
  } else {
    print "query failed: ", $res->errorstring, "\n" if $pedebug;
    return $res->errorstring;
  }	
 }
 #send messages to syslog
 sub Log($$)
  {
    if ($log) {
      my($level) = shift;
      my($mess) =shift;
      tie *MYLOG, 'Tie::Syslog',$level,$0,'pid','unix';
      print MYLOG $mess;
      untie *MYLOG;
    }
  }
 #send message to output or syslog
 #and die.
 sub BadDie($)
 {
  my($myerr) =$!;
  my($mess)=shift;
  if($log){
      tie *MYLOG, 'Tie::Syslog','local0.err',$0,'pid','unix';
      print MYLOG $mess;
      print MYLOG $myerr;
      untie *MYLOG;
  } else {
    print "$mess\n$myerr\n";
  }
  die $mess;
 }
 sub isIpAddr($)                     #return true if looks like ip address
 {
  my($ip) = shift;
  return 1 if ( $ip =~ m/$ipOnlyPAT/ );
  return 0;
 }
 sub isHostname($)                     #return true if looks like ip address
 {
  my($ip) = shift;
  return 1 if ( $ip =~ m/$hostnameOnlyPAT/ );
  return 0;
 }
 #send commands to chronyc by piping.
 sub chronyc($)                              #send commands to chronyc
 {
  my($command) = shift;
  my($err) = "/var/tmp/chronyc.log";
  my($chronyP) = "/usr/local/bin/chronyc";
  open(CHRONY, "| $chronyP 1>$err 2>&1");
  print CHRONY "$passwd$command\n";
  close(CHRONY);
  Log('local0.info',"chronyc command issued=$command");
                                   #look at status lines till return bad.
  open( IN, "<$err");
  my($status);
  while (<IN>) {
  $status = $_;
    unless ( m/\A200 OK/ ) {
      last;
    }
  }
  $status ="" if ( $status =~ m/\A200 OK/ );
  close(IN);
  unlink $err;
  Log('local0.info',"chronyc results=$status");
  return $status;
 }
 #common patterns
 # an ip address patern
 local($ipPAT) = qr/\d{1,3}(?:\.\d{1,3}){3}/;
 # an hostname pattern
 local($hostnamePAT) = qr/\w+(?:\.\w+)*/;
 #line with hostname only
 local($hostnameOnlyPAT) = qr/\A$hostnamePAT\Z/;
 #line with ip address only
 local($ipOnlyPAT) =qr/\A$ipPAT\Z/;
 #options hash
 my(%opts);
 getopts('nuadslPSC', \%opts);
 local($log) = ( $opts{'l'} ) ? 1 : 0;
 my($offline) = !( $opts{'n'} ) ;
 my($offlineS) = ( $opts{'n'} ) ? " " : " offline" ;
 # paul elliotts secret debug var. no one will ever find out about it.
 local($pedebug)=( ($ENV{"PAULELLIOTTDEBUG"}) or ($opts{P}) );
 if ($opts{C}) {
  print $copyrighttext;
  exit 0;
 }
 print <<"EOF" unless $opts{'S'};
 $0, Copyright (C) 2002 Paul Elliott
 $0 comes with ABSOLUTELY NO WARRANTY; for details
 invoke $0 -C.  This is free software, and you are welcome
 to redistribute it under certain conditions; invoke $0 -C
 for details.
 EOF
 local($passwd);
 # password to send to chronyc
 my($pl) = $ENV{"CHRONYPASSWORD"};
 #password comand to send to chronyc
 if ( $pl ) {
  $passwd = "password $pl\n";
 } else {
  $passwd = "";
 }
 print "passwd=$passwd\n" if ($pedebug);
 my(%host2ip);
 # hash of arrays. host2ip{$host}[0] is ip address for this host
 # host2ip{$host}[1]   is rest of paramenters for this host exc offline.
 #if debuging do chrony.conf in current directory.
 my($listfile) =( ($pedebug) ? "./chrony.conf" : "/etc/chrony.conf") ;
 # This section reads in the old data about
 # hostnames IP addresses and server parameters
 # data is stored as it would be in chrony.conf
 # file i.e.:
 #># HOSTNAME
 #>server IPADDR minpoll 5 maxpoll 10 maxdelay 0.4 offline 
 #
 # the parameter offline is omitted if the -n switch is specified.
 # first parameter is the filename of the file usually
 # is /etc/DNSchrony.conf
 # this is where we store the list of DNS hosts.
 # hosts with static IP address shold be kept in chrony.conf
 # this is header that marks dnyamic host section
 my($noedithead)=<<'EOF';
 ## DNSchrony dynamic dns server section. DO NOT EDIT
 ## per entry FORMAT:
 ##        |--------------------------------------------|
 ##        |#HOSTNAME                                   |
 ##        |server IP-ADDRESS extra-params [ offline ]  |
 ##        |--------------------------------------------|
 EOF
 #patern that recognizes above.
 my($noeditheadPAT) = 
 qr/\#\#\s+DNSchrony\s+dynamic\s+dns\s+server\s+section\.\s+DO\s+NOT\s+EDIT\s*/;
 #end of header marker.
 my($noeditheadend)=<<'EOF';
 ## END OF DNSchrony dynamic dns server section.
 EOF
 #pattern that matches above.
 my($noeditheadendPAT)=
 qr/\#\#\s+END\s+OF\s+DNSchrony\s+dynamic\s+dns\s+server\s+section.\s*/;
 #array to hold non dns portion of chrony.conf
 my(@chronyDconf);
 my($ip);
 my($rest);
 my($host);
 # for each entry in the list of hosts....
 open(READIN, "<$listfile") or  BadDie("Can not open $listfile");
 # read till dynamic patern read save in @chronyDconf
 while ( <READIN> ) {
  my($line) = $_;
  last if ( m/\A$noeditheadPAT\Z/ );
  push(@chronyDconf,$line);
 }
 while ( <READIN> ) {
   #end loop when end of header encountered
   last if ( m/\A$noeditheadendPAT/ );
   # parse the line giving ip address, extra pamamters, and host
   #do host comment line first
   ($host) = m{
 	       \A\#\s*
 	       ($hostnamePAT)
               \s*\z
              }xio;
  #no match skip this line.
  next unless (  $host );
  # read next line
  $_ = <READIN>;
  # parse out ip address extra parameters.
  ($ip,$rest) =
  m{
    \A
    \s*
    server                                       #server comand
    \s+
    ($ipPAT)                                     #ip address
    (?ixo: \s )
    \s*
    (
    (?(?!
            (?iox: offline )?                    #skip to offline #
            \s*                                  #or #
            \Z
    ).)*
    )
    (?ixo:
     \s*
     (?ixo: offline )?                          #consume to #
     \s*
     \Z
    )
    }xio ;
  #if failure again.
  next unless (  $ip );
  $rest =~ s/\s*\z//;                          #remove trail blanks
                                               #from parameters
  # store the data in the list
  # key is host name value is
  # array [0] is ip address
  #       [1] is other parameters
  $host2ip{$host} = [$ip,$rest] ;
  print "ip=$ip rest=$rest host=$host<\n" if $pedebug;
 }
 #read trailing line into @chronyDconf
 while ( <READIN> ) {
  push(@chronyDconf,$_);
 }
 close(READIN) or BadDie("can not close $listfile");
 #if the add command:
 # command can be HOST=IPADDRESS OTHER_PARAMETERS
 # means add the server trust the ip address geven with out a dns lookup
 # good for when dns is down but we know the ip addres
 # or
 #    HOST OTHER_PARAMETERS
 #we lookup the ip address with dns.
 if ($opts{'a'}) {
  my($param)= shift;
  # parse the param is it hostname
  if ( ($host,$ip) = $param =~ m/\A($hostnamePAT)=($ipPAT)\Z/ ) {
    printf "ip=$ip host=$host\n" if ($pedebug);
  } else {
    $host = $param;
    # get the ip address
    $ip = gethostaddr($host);
    if ( ! isIpAddr($ip) or ! isHostname($host) ) {
      print "query failed: ", $ip, "host=$host\n" if $pedebug;
      exit 1;
    } 
  }
  printf "ip=$ip host=$host\n" if ($pedebug);
  # add the server using chronyc
  my($status) = chronyc("add server $ip $rest");
  if ($status) {		#chronyc error
    print "chronyc failed, status=$status\n";
    exit 1;
  }
  # get rest of arguements
  $rest = join( ' ', @ARGV);
  print "rest=$rest\n" if ($pedebug);
  #save node in hash
  $host2ip{$host} = [$ip,$rest] ;
  print "ip=$ip rest=$rest host=$host<\n" if $pedebug;
 }
 #delete command if arguement is ip address
 #just delete it
 #if a hostname look it up
 #then delete it.
 if ($opts{'d'}) {
  $host = shift;
  #get host name is it ap address
  if ( isIpAddr($host) ) {                           # if ip address
    my($hostIT);
    my($found) =0;
    foreach $hostIT (keys(%host2ip) ) {               #search for match
      if ( $host2ip{$hostIT}[0] eq $host) {
 	$found=1;                                     #record match
      }
    }                                                 #end of search
    if ($found) {                                     #if match found
      my($status) = chronyc("delete $host");          #chronyc
      if ($status) {                                  #chronyc error
 	print "chronyc failed, status=$status\n";
 	exit 1;
      } else {                                        #reiterate
 	foreach $hostIT (keys(%host2ip) ) {
 	  if ( $host2ip{$hostIT}[0] eq $host) {
 	    delete $host2ip{$hostIT};                 #deleting match hosts
 	  }
 	}
      }
    }
  } else {                                          #else not ip address
                                                    #must be hostname
    if ( ! $host2ip{$host} ) {
      print "No such host as $host listed\n";
      exit 1;
    }
                                                    #get ip address
    $ip=gethostaddr($host);
    if ( ! isIpAddr($ip) ) {                        #no ip address
      print "query failed: ", $ip, "\n" if $pedebug;
      exit 1;
    } 
    printf "ip=$ip host=$host\n" if ($pedebug);
    my($listed_host_ip) = $host2ip{$host}[0];       # get the ip address saved
    if ( $ip ne $listed_host_ip) {
      print 
 	"Info: listed host ip=>$listed_host_ip".
        "< is different from DNS ip=>$ip<\n";
      $ip = $listed_host_ip;
    }
    # delete the server
    my($status) = chronyc("delete $listed_host_ip\n");
    if ($status) {
      print "chronyc failed, status=$status\n";
      exit 1;
    }
    #delete table entry
    delete$host2ip{$host};
  }
 }
 #update for each host who's dns ip address has changed
 #delete the old server and add the new. update the record.
 if ($opts{'u'}) {
  my($command);
  my(%prospective);                        # store new IP address we
                                           #are thinking of changing.
  Log('local0.info',
      "Now searching for modified DNS entries.");
  foreach $host (keys(%host2ip)) {         #for each listed host
    my($old_ip) = $host2ip{$host}[0];      #get old ip
    $rest       = $host2ip{$host}[1];      #extra params
    $ip         = gethostaddr($host);      #get new ip from dns
                                           #if error
    if ( ! isIpAddr($ip) or ! isHostname($host) ) {
      print "query failed: ", $ip, "host=$host\n";
      Log('local0.err',"query failed: ". $ip . "host=$host");
      exit 1;
    } 
    next if($ip eq $old_ip);                #if ip not changed, skip
    Log('local0.info',"Ip address for $host has changed. Old IP address=".
                      "$old_ip, new IP address=$ip");
    # add command to delete old host, add the new.
    $command = $command . "delete $old_ip\n" .
               "add server $ip $rest\n";
    # we are now thinking about changing this host ip
    $prospective{$host} = [$ip,$rest];
  }
  # submit all the accumulated chronyc commands if any.
  if ($command) {
    $status = chronyc($command);
    if ($status) {
      print "chronyc failed, status=$status\n";
      Log('local0.err',"query failed: ". $ip . "host=$host");
      exit 1;
    }
  } else {                                  #if no commands exit
    exit 0;                                 #because no rewrite of file needed
  }
  #copy prospective modifications back into main table.
  #we now know that all these mods were done with chronyc
  foreach $host (keys(%prospective)) {
    my($ip) = $prospective{$host}[0];
    $rest       = $prospective{$host}[1];
    $host2ip{$host} = [$ip,$rest];
  }
 }
 #starting for each entry we have read in from the old list
 # add the server in chronyc
 # this option is seldom used.
 if ($opts{'s'}) {
  my($command)="";
  foreach $host (keys(%host2ip)) {
    $command = $command . "add server $host2ip{$host}[0] ".
                          "$host2ip{$host}[1]\n";
  }
  my($status) = chronyc($command);
  if ($status) {
    print "chronyc failed, status=$status\n";
    exit 1;
  }
 }
 # write out the data file in format
 #># HOSTNAME
 #>server IPADDRESS extra parameters [offline] 
 # offline is omitted if -n switch is specified.
 my(@value);
 my($such);
 {
  # to start out we write to temporary file.
  (my($writeout) , my($outname)) = mkstemp( "${listfile}.outXXXXXXX");
  $outname or BadDie("can not open for $listfile");
  # save the chrony.conf part!
  # and write the DYNAMIC header
  print $writeout @chronyDconf, $noedithead;
  # for each entry
  foreach $host (keys(%host2ip) ){
    #write the record
    # write the comment that indicates the hostname
    # and the server command.
    print $writeout 
     "\# $host\nserver $host2ip{$host}[0] $host2ip{$host}[1]${offlineS}\n" ;
    print 
     "server $host2ip{$host}[0] $host2ip{$host}[1]${offlineS}\# $host\n" 
     if $pedebug;
  }
  #WRITE THE end of dnyamic marker comment
  print $writeout $noeditheadend;
  # close the output file which was a temporary file.
  close($writeout) or BadDie("can not close $outname");
  # we now begin a intracate dance to make the the temporary
  # the main chrony.conf
  #
  # if there is a chrony.conf.BAK save it to a temporary.
  # rename chrony.conf to chrony.conf.BAK
  # rename the temporary to chrony.conf
  # if there already was a chrony.conf.BAK, unlink the copy of this.
  my($backname) = "$listfile\.BAK";
  my($backplain)  = ( -f $backname );
  my($saveback);
  #if chrony.conf.BAK exists rename to a temporary.
  if ($backplain ) {
    $saveback = mktemp("${backname}.bakXXXXXXX");
    move($backname,$saveback) or 
         BadDie "unable to move $backname to $savename";
  }
  # rename old chrony.conf to chrony.conf.BAK
  move($listfile,$backname) or
       BadDie "unable to move $listfile to $backname";
  # rename our output to chrony.conf
  move($outname,$listfile) or
       BadDie "unable to move $outname to $listfile";
  #if there was a temporary chrony.conf.BAK that we saved to temp
  #unlink it
  unlink($saveback) or BadDie "unable to unlink $saveback" if($backplain);
 }
--- a/contrib/DNSchrony/DNSchronyADD
+++ b/contrib/DNSchrony/DNSchronyADD
@@ -0,0 +1,21 @@
 #!/usr/bin/bash
 # $1 is chrony password.
 # $2 is hostname to add or hostname=ipaddres
 # $3-$9 is rest of extra server parameters
 FIRST="$1"
 HOST="$2"
 shift 2
 #remaining parameters a the other paramaters to server command
 #excluding "offline"
 ARGS="$*"
 #if none use default taken from chrony documentation.
 DEF="minpoll 5 maxpoll 10 maxdelay 0.4"
 DARGS=${ARGS:-$DEF}
 CHRONYPASSWORD=$FIRST \
 /usr/local/bin/DNSchrony.pl -a  "$HOST" "$DARGS"
--- a/contrib/DNSchrony/DNSchronyDELETE
+++ b/contrib/DNSchrony/DNSchronyDELETE
@@ -0,0 +1,7 @@
 #!/usr/bin/bash
 # $1 is chrony password.
 # $2 host to be deleted if ip nn.n.n.n then no DNS used
 CHRONYPASSWORD=$1 \
 /usr/local/bin/DNSchrony.pl -d  $2
--- a/contrib/DNSchrony/DNSchronyUPDATE
+++ b/contrib/DNSchrony/DNSchronyUPDATE
@@ -0,0 +1,7 @@
 #!/usr/bin/bash
 # $1 is chrony password.
 CHRONYPASSWORD=$1 \
 /usr/local/bin/DNSchrony.pl -ulS
--- a/contrib/DNSchrony/README
+++ b/contrib/DNSchrony/README
@@ -0,0 +1,166 @@
                Copyright (C) Paul Elliott 2002
 DNSchrony.pl version -2.0
 Problem: If you look at the list of secondary NTP servers:
 http://www.eecis.udel.edu/~mills/ntp/clock2.htm
 you will find statements like this:
 "Note: IP addresses are subject to change; please use DNS"
 These servers represent a problem for chrony. Chrony is a program
 designed to work on hosts with an intermittent connection to the
 internet. Often no DNS is available when chrony starts. As chrony
 is currently designed, chronyd never sees a DNS host name. If a
 user specifies one when using chronyc's "add server" command, the
 DNS lookup is done by chronyc and an IP address is passed to chronyd.
 One can imagine I suppose, a redesign to chrony in which chronyd
 keeps track of DNS changes. But this has problems, all the time
 chronyd is fooling around with DNS, it would not be keeping track
 of its prime function, what the clocks and NTP servers are saying.
 This could result in poorer performance. Or perhaps you say that
 chronyd should be multi threaded. One thread to fool with DNS
 and another to keep track of time. But this introduces a great
 deal of complexity, and complexity is the enemy of elegant robust
 code. Besides, Richard probably has better things to do.
 I have attempted to address this problem with a humble perl script,
 which I now release under the GPL: DNSchrony.pl
 PLEA FOR HELP FROM EXPERIENCED PERL HACKERS.
 Please go thru the code and find errors and improvements.
 I am not quite an polished perl hacker. Please fix bugs and
 make improvements. It needs better documentation. Someone
 who knows how, put in some POD.
 END OF PLEA
 Philosophy of DNSchrony.pl: keep a list of servers that use
 DNS. From time to time, hopefully when DNS is up, go thru
 the list lookup all the hostnames and see if any ip addresses have
 changed. If any have changed, update our list and do chronyc
 "delete" and "add server" commands so that chronyd now talks to
 the right NTP server.
 Additional nuance: keep the list in /etc/chrony.conf in the
 form of comments starting with "#" and "server" commands
 legal in a chrony.conf file. Format of a list entry:
 # hostname
 server IP-ADDRESS extra server parameters
 These entries are delimited by special comments that allow
 DNSchrony.pl to find them and also tell humans not to mess with them.
 Example of such a section of a chrony.conf file:
 dumpdir /var/log/chrony
 rtcfile /etc/chrony.rtc
 ## DNSchrony dynamic dns server section. DO NOT EDIT
 ## per entry FORMAT:
 ##        |--------------------------------------------|
 ##        |#HOSTNAME                                   |
 ##        |server IP-ADDRESS extra-params [ offline ]  |
 ##        |--------------------------------------------|
 # tock.greyware.com
 server 208.14.208.44 minpoll 5 maxpoll 10 maxdelay 0.4 offline
 # tick.greyware.com
 server 208.14.208.19 minpoll 5 maxpoll 10 maxdelay 0.4 offline
 # ntppub.tamu.edu
 server 128.194.254.9 minpoll 5 maxpoll 10 maxdelay 0.4 offline
 ## END OF DNSchrony dynamic dns server section.
 This allows the list of dynamic DNS servers to be preserved
 when chronyd is stoped/started.
 All servers that do not have ip addresses subject to change
 should be put in the regular part of chrony.conf as described
 in the chrony documentation.
 Security philosophy: DNSchrony does no security checking but
 relies on other security factors.
 Users without the privilege to modify /etc/chrony.conf and the
 directory /etc will be unable to use DNSchrony to do so, because
 of file protections. DNSchrony passes thru passwords to chronyc.
 Users that do not know the correct chronyc  password will be
 unable to get chronyd do do anything. Thus, DNSchrony passes
 the buck to these other security features.
 INSTALLATION:
 copy the files:  DNSchronyADD DNSchronyUPDATE DNSchronyDELETE DNSchrony.pl
 to /usr/local/bin. Backup the file /etc/chrony.conf leave hosts
 with static ip addresses in this file.
 DNSchrony uses the following perl modules. See that they are installed.
 Get them from CPAN if needed.
 Net::DNS, Tie::Syslog, Getopt::Std, Socket, File.
 Cause DNSchronyUPDATE bash script to run from time to time when DNS
 is working. If you have a dialup, one way to do this would be to
 modify your /etc/ppp/ip-up.local file as follows:
 cat <<EOF | /usr/local/bin/chronyc
 password mysecret
 online
 EOF
 # update all of the dynamic servers and save the result.
 # do not wait for response
 nohup /usr/local/bin/DNSchronyUPDATE mysecret >/dev/null 2>&1 &
 Since this file contains the chronyc password you will want to set the
 file permissions so that just everybody will not be able to read
 it. But you already did that when you put in the chronyc command.  Any
 other way to make DNSchronyUPDATE run perodicly when DNS is up will
 also work.
 To add a server with a varying IP address one could run:
 /usr/local/bin/DNSchronyADD mysecret tock.greyware.com
 or if you want to specify different server parameters you
 could say:
 /usr/local/bin/DNSchronyADD mysecret tock.greyware.com "minpoll 10 maxpoll 20 maxdelay 0.8"
 The DNSchronyADD's default for these parameters is:
 "minpoll 5 maxpoll 10 maxdelay 0.4" values that are often shown
 as examples in the chrony documentation.
 If DNS is not running now but you know the IP address, you can say:
 /usr/local/bin/DNSchronyADD mysecret tock.greyware.com=208.14.208.44
 Of course, the IP address will be checked next time DNSchronyUPDATE
 runs.
 To delete dynamic DNS a server:
 /usr/local/bin/DNSchronyDELETE mysecret tock.greyware.com
 To change parameters delete and re-add.
 Of course, in all of the above "mysecret" is your chronyc password
 which SHOULD NOT BE "mysecret".
 ----------------------------------------------
 DNSchrony.pl is covered by the GPL
 #                Copyright (C) Paul Elliott 2002
 #   This program is free software; you can redistribute it and/or modify
 #   it under the terms of the GNU General Public License as published by
 #   the Free Software Foundation; either version 2 of the License, or
 #   (at your option) any later version.
 #
 #   This program is distributed in the hope that it will be useful,
 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #   GNU General Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License
 #   along with this program; if not, write to the Free Software
 #   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #   SEE COPYING FOR DETAILS
--- a/contrib/DNSchrony/ip-up.local
+++ b/contrib/DNSchrony/ip-up.local
@@ -0,0 +1,22 @@
 #example file /etc/ppp/ip-up.local
 #originally from SuSE distribution
 #modified for chrony
 cat <<EOF | /usr/local/bin/chronyc
 password mysecret
 online
 EOF
 # update all of the dynamic servers and save the result.
 # do not wait for response
 nohup /usr/local/bin/DNSchronyUPDATE mysecret >/dev/null 2>&1 &
 #other stuff who knows?
 # The following lines added for Linux-HA support             # Heartbeat
 DEVFILE=`echo $DEVICE | sed -e 's!^/dev/!!' -e 's!/!.!g'` # Heartbeat
 OUTFILE=/var/run/ppp.d/$DEVFILE                             # Heartbeat
 (                    # Heartbeat
 echo "$IPREMOTE"    # Heartbeat
 echo "$IFNAME"      # Heartbeat
 echo "$PPPD_PID"    # Heartbeat
 echo "$IPLOCAL"     # Heartbeat
 ) > $OUTFILE        # Heartbeat
--- a/contrib/bryan_christianson_1/README.txt
+++ b/contrib/bryan_christianson_1/README.txt
@@ -1,103 +0,0 @@
 Notes for installing chrony on macOS
 Author: Bryan Christianson (bryan@whatroute.net)
 ------------------------------------------------
 These files are for those admins/users who would prefer to install chrony
 from the source distribution and are intended as guidelines rather than
 being definitive. They can be edited with a plain text editor, such as
 vi, emacs or your favourite IDE (Xcode)
 It is assumed you are comfortable with installing software from the
 terminal command line and know how to use sudo to acquire root access.
 If you are not familiar with the macOS command line then
 please consider using ChronyControl from http://whatroute.net/chronycontrol.html
 ChronyControl provides a gui wrapper for installing these files and sets the
 necessary permissions on each file.
 Install the chrony software
 ---------------------------
 You will need xcode and the commandline additions to build and install chrony.
 These can be obtained from Apple's website via the App Store.
 cd to the chrony directory
 ./configure
 make
 sudo make install
 chrony is now installed in default locations (/usr/local/sbin/chronyd,
 /usr/local/bin/chronyc)
 Create a chrony.conf file - see the chrony website for details
 The support files here assume the following directives are specified in the
 chrony.conf file
 keyfile /etc/chrony.d/chrony.keys
 driftfile /var/db/chrony/chrony.drift
 bindcmdaddress /var/db/chrony/chronyd.sock
 logdir /var/log/chrony
 dumpdir /var/db/chrony
 Install this file as /etc/chrony.d/chrony.conf and create
 the directories specified in the above directives if they don't exist.
 You will need root permissions to create the directories.
 Running chronyd
 ---------------
 At this point chronyd *could* be run as a daemon. Apple discourage running
 daemons and their preferred method uses the launchd facility. The
 support files here provide a launchd configuration file for chronyd and also
 a shell script and launchd configuration file to rotate the chronyd logs on a daily basis.
 Support files
 -------------
 Dates and sizes may differ
 -rw-r--r--  1 yourname  staff  2084  4 Aug 22:54 README.txt
 -rwxr-xr-x  1 yourname  staff   676  4 Aug 21:18 chronylogrotate.sh
 -rw-r--r--  1 yourname  staff   543 18 Jul 20:10 org.tuxfamily.chronyc.plist
 -rw-r--r--  1 yourname  staff   511 19 Jun 18:30 org.tuxfamily.chronyd.plist
 If you have used chrony support directories other than those suggested, you
 will need to edit each file and make the appropriate changes.
 Installing the support files
 ----------------------------
 1. chronylogrotate.sh
 This is a simple shell script that deletes old log files. Unfortunately because
 of the need to run chronyc, the standard macOS logrotation does not work with
 chrony logs.
 This script runs on a daily basis under control of launchd and should be
 installed in the /usr/local/bin directory
 sudo cp chronylogrotate.sh /usr/local/bin
 sudo chmod +x /usr/local/bin/chronylogrotate.sh
 sudo chown root:wheel /usr/local/bin/chronylogrotate.sh
 2. org.tuxfamily.chronyc.plist
 This file is the launchd plist that runs logrotation each day. You may
 wish to edit this file to change the time of day at which the rotation
 will run, currently 04:05 am
 sudo cp org.tuxfamily.chronyc.plist /Library/LaunchDaemons
 sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
 sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
 sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
 3. org.tuxfamily.chronyd.plist
 This file is the launchd plist that runs chronyd when the Macintosh starts.
 sudo cp org.tuxfamily.chronyd.plist /Library/LaunchDaemons
 sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
 sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
 sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
--- a/contrib/bryan_christianson_1/chronylogrotate.sh
+++ b/contrib/bryan_christianson_1/chronylogrotate.sh
@@ -1,58 +0,0 @@
 #!/bin/sh
 #  chronyd/chronyc - Programs for keeping computer clocks accurate.
 #
 #  **********************************************************************
 #  * Copyright (C) Bryan Christianson  2015
 #  *
 #  * This program is free software; you can redistribute it and/or modify
 #  * it under the terms of version 2 of the GNU General Public License as
 #  * published by the Free Software Foundation.
 #  *
 #  * This program is distributed in the hope that it will be useful, but
 #  * WITHOUT ANY WARRANTY; without even the implied warranty of
 #  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 #  * General Public License for more details.
 #  *
 #  * You should have received a copy of the GNU General Public License along
 #  * with this program; if not, write to the Free Software Foundation, Inc.,
 #  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #  *
 #  **********************************************************************
 LOGDIR=/var/log/chrony
 rotate () {
  prefix=$1
  rm -f $prefix.log.10
  for (( count=9; count>= 0; count-- ))
  do
    next=$(( $count+1 ))
    if [ -f $prefix.log.$count ]; then
      mv $prefix.log.$count $prefix.log.$next
    fi
  done
  if [ -f $prefix.log ]; then
    mv $prefix.log $prefix.log.0
  fi
 }
 if [ ! -e "$LOGDIR" ]; then
  logger -s "missing directory: $LOGDIR"
  exit 1
 fi
 cd $LOGDIR
 rotate measurements
 rotate statistics
 rotate tracking
 #
 # signal chronyd via chronyc
 /usr/local/bin/chronyc cyclelogs > /dev/null
 exit $?
--- a/contrib/bryan_christianson_1/org.tuxfamily.chronyc.plist
+++ b/contrib/bryan_christianson_1/org.tuxfamily.chronyc.plist
@@ -1,22 +0,0 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
 	<key>Label</key>
 	<string>org.tuxfamily.logrotate</string>
 	<key>KeepAlive</key>
 	<false/>
 	<key>ProgramArguments</key>
 	<array>
 		<string>/bin/sh</string>
 		<string>/usr/local/bin/chronylogrotate.sh</string>
 	</array>
 	<key>StartCalendarInterval</key>
 	<dict>
 		<key>Minute</key>
 		<integer>5</integer>
 		<key>Hour</key>
 		<integer>4</integer>
 	</dict>
 </dict>
 </plist>
--- a/contrib/bryan_christianson_1/org.tuxfamily.chronyd.plist
+++ b/contrib/bryan_christianson_1/org.tuxfamily.chronyd.plist
@@ -1,19 +0,0 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
 	<key>Label</key>
 	<string>org.tuxfamily.chronyd</string>
 	<key>Program</key>
 	<string>/usr/local/sbin/chronyd</string>
 	<key>ProgramArguments</key>
 	<array>
 		<string>chronyd</string>
 		<string>-n</string>
 		<string>-f</string>
 		<string>/private/etc/chrony.d/chrony.conf</string>
 	</array>
 	<key>KeepAlive</key>
 	<true/>
 </dict>
 </plist>
--- a/doc/Makefile.in
+++ b/doc/Makefile.in
@@ -1,76 +0,0 @@
 ADOC = asciidoctor
 ADOC_FLAGS =
 SED = sed
 HTML_TO_TXT = w3m -dump -T text/html
 MAN_FILES = chrony.conf.man chronyc.man chronyd.man
 TXT_FILES = faq.txt installation.txt
 HTML_FILES = $(MAN_FILES:%.man=%.html) $(TXT_FILES:%.txt=%.html)
 MAN_IN_FILES = $(MAN_FILES:%.man=%.man.in)
 SYSCONFDIR = @SYSCONFDIR@
 BINDIR = @BINDIR@
 SBINDIR = @SBINDIR@
 MANDIR = @MANDIR@
 DOCDIR = @DOCDIR@
 CHRONYRUNDIR = @CHRONYRUNDIR@
 CHRONYVARDIR = @CHRONYVARDIR@
 CHRONY_VERSION = @CHRONY_VERSION@
 DEFAULT_USER = @DEFAULT_USER@
 DEFAULT_HWCLOCK_FILE = @DEFAULT_HWCLOCK_FILE@
 DEFAULT_PID_FILE = @DEFAULT_PID_FILE@
 DEFAULT_RTC_DEVICE = @DEFAULT_RTC_DEVICE@
 SED_COMMANDS = "s%\@SYSCONFDIR\@%$(SYSCONFDIR)%g;\
 	       s%\@BINDIR\@%$(BINDIR)%g;\
 	       s%\@SBINDIR\@%$(SBINDIR)%g;\
 	       s%\@CHRONY_VERSION\@%$(CHRONY_VERSION)%g;\
 	       s%\@DEFAULT_HWCLOCK_FILE\@%$(DEFAULT_HWCLOCK_FILE)%g;\
 	       s%\@DEFAULT_PID_FILE\@%$(DEFAULT_PID_FILE)%g;\
 	       s%\@DEFAULT_RTC_DEVICE\@%$(DEFAULT_RTC_DEVICE)%g;\
 	       s%\@DEFAULT_USER\@%$(DEFAULT_USER)%g;\
 	       s%\@CHRONYRUNDIR\@%$(CHRONYRUNDIR)%g;\
 	       s%\@CHRONYVARDIR\@%$(CHRONYVARDIR)%g;"
 man: $(MAN_FILES) $(MAN_IN_FILES)
 html: $(HTML_FILES)
 txt: $(TXT_FILES)
 docs: man html
 %.html: %.adoc
 	$(ADOC) $(ADOC_FLAGS) -b html -o - $< | $(SED) -e $(SED_COMMANDS) > $@
 %.man.in: %.adoc
 	$(ADOC) $(ADOC_FLAGS) -b manpage -o $@ $<
 %.man: %.man.in
 	$(SED) -e $(SED_COMMANDS) < $< > $@
 %.txt: %.html
 	$(HTML_TO_TXT) < $< > $@
 install: $(MAN_FILES)
 	[ -d $(DESTDIR)$(MANDIR)/man1 ] || mkdir -p $(DESTDIR)$(MANDIR)/man1
 	[ -d $(DESTDIR)$(MANDIR)/man5 ] || mkdir -p $(DESTDIR)$(MANDIR)/man5
 	[ -d $(DESTDIR)$(MANDIR)/man8 ] || mkdir -p $(DESTDIR)$(MANDIR)/man8
 	cp chronyc.man $(DESTDIR)$(MANDIR)/man1/chronyc.1
 	chmod 644 $(DESTDIR)$(MANDIR)/man1/chronyc.1
 	cp chronyd.man $(DESTDIR)$(MANDIR)/man8/chronyd.8
 	chmod 644 $(DESTDIR)$(MANDIR)/man8/chronyd.8
 	cp chrony.conf.man $(DESTDIR)$(MANDIR)/man5/chrony.conf.5
 	chmod 644 $(DESTDIR)$(MANDIR)/man5/chrony.conf.5
 install-docs: $(HTML_FILES)
 	[ -d $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
 	for f in $(HTML_FILES); do \
 	  cp $$f $(DESTDIR)$(DOCDIR); \
 	  chmod 644 $(DESTDIR)$(DOCDIR)/$$f; \
 	done
 clean:
 	rm -f $(MAN_FILES) $(TXT_FILES) $(HTML_FILES)
 	rm -f $(MAN_IN_FILES)
 distclean:
 	rm -f $(MAN_FILES) $(TXT_FILES) $(HTML_FILES)
 	rm -f Makefile
--- a/doc/chrony.conf.adoc
+++ b/doc/chrony.conf.adoc
--- a/doc/chronyc.adoc
+++ b/doc/chronyc.adoc
--- a/doc/chronyd.adoc
+++ b/doc/chronyd.adoc
@@ -1,186 +0,0 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Miroslav Lichvar  2009-2017
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
 // published by the Free Software Foundation.
 //
 // This program is distributed in the hope that it will be useful, but
 // WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 // General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License along
 // with this program; if not, write to the Free Software Foundation, Inc.,
 // 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 = chronyd(8)
 :doctype: manpage
 :man manual: System Administration
 :man source: chrony @CHRONY_VERSION@
 == NAME
 chronyd - chrony daemon
 == SYNOPSIS
 *chronyd* [_OPTION_]... [_DIRECTIVE_]...
 == DESCRIPTION
 *chronyd* is a daemon for synchronisation of the system clock. It can
 synchronise the clock with NTP servers, reference clocks (e.g. a GPS receiver),
 and manual input using wristwatch and keyboard via *chronyc*. It can also
 operate as an NTPv4 (RFC 5905) server and peer to provide a time service to
 other computers in the network.
 If no configuration directives are specified on the command line, *chronyd*
 will read them from a configuration file. The compiled-in default location of
 the file is _@SYSCONFDIR@/chrony.conf_.
 Information messages and warnings will be logged to syslog.
 == OPTIONS
 *-4*::
 With this option hostnames will be resolved only to IPv4 addresses and only
 IPv4 sockets will be created.
 *-6*::
 With this option hostnames will be resolved only to IPv6 addresses and only
 IPv6 sockets will be created.
 *-f* _file_::
 This option can be used to specify an alternate location for the configuration
 file (default _@SYSCONFDIR@/chrony.conf_).
 *-n*::
 When run in this mode, the program will not detach itself from the terminal.
 *-d*::
 When run in this mode, the program will not detach itself from the terminal,
 and all messages will be written to the terminal instead of syslog. When
 *chronyd* was compiled with debugging support, this option can be used twice to
 print also debugging messages.
 *-l* _file_::
 This option specifies a file which should be used for logging instead of syslog
 or terminal.
 *-q*::
 When run in this mode, *chronyd* will set the system clock once and exit. It
 will not detach from the terminal.
 *-Q*::
 This option is similar to the *-q* option, except it only prints the offset
 without making any corrections of the clock and it allows *chronyd* to be
 started without root privileges.
 *-r*::
 This option will try to reload and then delete files containing sample
 histories for each of the servers and reference clocks being used. The
 files are expected to be in the directory specified by the
 <<chrony.conf.adoc#dumpdir,*dumpdir*>>
 directive in the configuration file. This option is useful if you want to stop
 and restart *chronyd* briefly for any reason, e.g. to install a new version.
 However, it should be used only on systems where the kernel can maintain clock
 compensation whilst not under *chronyd*'s control (i.e. Linux, FreeBSD, NetBSD,
 Solaris, and macOS 10.13 or later).
 *-R*::
 When this option is used, the <<chrony.conf.adoc#initstepslew,*initstepslew*>>
 directive and the <<chrony.conf.adoc#makestep,*makestep*>> directive used with
 a positive limit will be ignored. This option is useful when restarting
 *chronyd* and can be used in conjunction with the *-r* option.
 *-s*::
 This option will set the system clock from the computer's real-time clock (RTC)
 or to the last modification time of the file specified by the
 <<chrony.conf.adoc#driftfile,*driftfile*>> directive. Real-time clocks are
 supported only on Linux.
 +
 If used in conjunction with the *-r* flag, *chronyd* will attempt to preserve
 the old samples after setting the system clock from the RTC. This can be used
 to allow *chronyd* to perform long term averaging of the gain or loss rate
 across system reboots, and is useful for systems with intermittent access to
 network that are shut down when not in use. For this to work well, it relies
 on *chronyd* having been able to determine accurate statistics for the
 difference between the RTC and system clock last time the computer was on.
 +
 If the last modification time of the drift file is later than both the current
 time and the RTC time, the system time will be set to it to restore the time
 when *chronyd* was previously stopped. This is useful on computers that have no
 RTC or the RTC is broken (e.g. it has no battery).
 *-t* _timeout_::
 This option sets a timeout (in seconds) after which *chronyd* will exit. If the
 clock is not synchronised, it will exit with a non-zero status. This is useful
 with the *-q* or *-Q* option to shorten the maximum time waiting for
 measurements, or with the *-r* option to limit the time when *chronyd* is
 running, but still allow it to adjust the frequency of the system clock.
 *-u* _user_::
 This option sets the name of the system user to which *chronyd* will switch
 after start in order to drop root privileges. It overrides the
 <<chrony.conf.adoc#user,*user*>> directive (default _@DEFAULT_USER@_).
 +
 On Linux, *chronyd* needs to be compiled with support for the *libcap* library.
 On macOS, FreeBSD, NetBSD and Solaris *chronyd* forks into two processes.
 The child process retains root privileges, but can only perform a very limited
 range of privileged system calls on behalf of the parent.
 *-F* _level_::
 This option configures a system call filter when *chronyd* is compiled with
 support for the Linux secure computing (seccomp) facility. In level 1 the
 process is killed when a forbidden system call is made, in level -1 the SIGSYS
 signal is thrown instead and in level 0 the filter is disabled (default 0).
 +
 It's recommended to enable the filter only when it's known to work on the
 version of the system where *chrony* is installed as the filter needs to allow
 also system calls made from libraries that *chronyd* is using (e.g. libc) and
 different versions or implementations of the libraries may make different
 system calls. If the filter is missing some system call, *chronyd* could be
 killed even in normal operation.
 *-P* _priority_::
 On Linux, this option will select the SCHED_FIFO real-time scheduler at the
 specified priority (which must be between 0 and 100). On macOS, this option
 must have either a value of 0 (the default) to disable the thread time
 constraint policy or 1 for the policy to be enabled. Other systems do not
 support this option.
 *-m*::
 This option will lock *chronyd* into RAM so that it will never be paged out.
 This mode is only supported on Linux.
 *-x*::
 This option disables the control of the system clock. *chronyd* will not try to
 make any adjustments of the clock. It will assume the clock is free running and
 still track its offset and frequency relative to the estimated true time. This
 option allows *chronyd* to run without the capability to adjust or set the
 system clock (e.g. in some containers) in order to operate as an NTP server. It
 is not recommended to run *chronyd* (with or without *-x*) when another process
 is controlling the system clock.
 *-v*::
 With this option *chronyd* will print version number to the terminal and exit.
 == FILES
 _@SYSCONFDIR@/chrony.conf_
 == SEE ALSO
 <<chronyc.adoc#,*chronyc(1)*>>, <<chrony.conf.adoc#,*chrony.conf(5)*>>
 == BUGS
 For instructions on how to report bugs, please visit
 https://chrony.tuxfamily.org/.
 == AUTHORS
 chrony was written by Richard Curnow, Miroslav Lichvar, and others.
--- a/doc/faq.adoc
+++ b/doc/faq.adoc
@@ -1,557 +0,0 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Miroslav Lichvar  2014-2016
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
 // published by the Free Software Foundation.
 //
 // This program is distributed in the hope that it will be useful, but
 // WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 // General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License along
 // with this program; if not, write to the Free Software Foundation, Inc.,
 // 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 = Frequently Asked Questions
 :toc:
 :numbered:
 == `chrony` compared to other programs
 === How does `chrony` compare to `ntpd`?
 `chronyd` was designed to work well in a wide range of conditions and it can
 usually synchronise the system clock faster and with better time accuracy. It
 doesn't implement some of the less useful NTP modes like broadcast client or
 multicast server/client.
 If your computer is connected to the Internet only for few minutes at a time,
 the network connection is often congested, you turn your computer off or
 suspend it frequently, the clock is not very stable (e.g. there are rapid
 changes in the temperature or it's a virtual machine), or you want to use NTP
 on an isolated network with no hardware reference clocks in sight, `chrony`
 will probably work much better for you.
 For a more detailed comparison of features and performance, see the
 https://chrony.tuxfamily.org/comparison.html[comparison page] on the `chrony`
 website.
 == Configuration issues
 === What is the minimum recommended configuration for an NTP client?
 First, the client needs to know which NTP servers it should ask for the current
 time. They are specified by the `server` or `pool` directive. The `pool`
 directive can be used for names that resolve to multiple addresses. For good
 reliability the client should have at least three servers. The `iburst` option
 speeds up the initial synchronisation.
 To stabilise the initial synchronisation on the next start, the estimated drift
 of the system clock is saved to a file specified by the `driftfile` directive.
 If the system clock can be far from the true time after boot for any reason,
 `chronyd` should be allowed to correct it quickly by stepping instead of
 slewing, which would take a very long time. The `makestep` directive does
 that.
 In order to keep the real-time clock (RTC) close to the true time, so the
 system time is reasonably close to the true time when it's initialised on the
 next boot from the RTC, the `rtcsync` directive enables a mode in which the
 system time is periodically copied to the RTC. It is supported on Linux and
 macOS.
 If you want to use public NTP servers from the
 http://www.pool.ntp.org/[pool.ntp.org] project, the minimal _chrony.conf_ file
 could be:
 ----
 pool pool.ntp.org iburst
 driftfile /var/lib/chrony/drift
 makestep 1 3
 rtcsync
 ----
 === How do I make an NTP server from an NTP client?
 You need to add an `allow` directive to the _chrony.conf_ file in order to open
 the NTP port and allow `chronyd` to reply to client requests. `allow` with no
 specified subnet allows access from all IPv4 and IPv6 addresses.
 === I have several computers on a LAN. Should be all clients of an external server?
 The best configuration is usually to make one computer the server, with
 the others as clients of it. Add a `local` directive to the server's
 _chrony.conf_ file. This configuration will be better because
 * the load on the external connection is less
 * the load on the external NTP server(s) is less
 * if your external connection goes down, the computers on the LAN
  will maintain a common time with each other.
 === Must I specify servers by IP address if DNS is not available on chronyd start?
 No. Starting from version 1.25, `chronyd` will keep trying to resolve
 the names specified by the `server`, `pool`, and `peer` directives in an
 increasing interval until it succeeds. The `online` command can be issued from
 `chronyc` to force `chronyd` to try to resolve the names immediately.
 === How can I make `chronyd` more secure?
 If you don't need to serve time to NTP clients or peers, you can add `port 0`
 to the _chrony.conf_ file to completely disable the NTP server functionality
 and prevent NTP requests from reaching `chronyd`. Starting from version 2.0,
 the NTP server port is open only when client access is allowed by the `allow`
 directive or command, an NTP peer is configured, or the `broadcast` directive
 is used.
 If you don't need to use `chronyc` remotely, you can add the following
 directives to the configuration file to bind the command sockets to the
 loopback interface. This is done by default since version 2.0.
 ----
 bindcmdaddress 127.0.0.1
 bindcmdaddress ::1
 ----
 If you don't need to use `chronyc` at all or you need to run `chronyc` only
 under the root or _chrony_ user (which can access `chronyd` through a Unix
 domain socket since version 2.2), you can disable the internet command sockets
 completely by adding `cmdport 0` to the configuration file.
 You can specify an unprivileged user with the `-u` option, or the `user`
 directive in the _chrony.conf_ file, to which `chronyd` will switch after start
 in order to drop root privileges. The configure script has a `--with-user`
 option, which sets the default user. On Linux, `chronyd` needs to be compiled
 with support for the `libcap` library. On other systems, `chronyd` forks into
 two processes. The child process retains root privileges, but can only perform
 a very limited range of privileged system calls on behalf of the parent.
 Also, if `chronyd` is compiled with support for the Linux secure computing
 (seccomp) facility, you can enable a system call filter with the `-F` option.
 It will significantly reduce the kernel attack surface and possibly prevent
 kernel exploits from the `chronyd` process if it's compromised. It's
 recommended to enable the filter only when it's known to work on the version of
 the system where `chrony` is installed as the filter needs to allow also system
 calls made from libraries that `chronyd` is using (e.g. libc) and different
 versions or implementations of the libraries may make different system calls.
 If the filter is missing some system call, `chronyd` could be killed even in
 normal operation.
 === How can I improve the accuracy of the system clock with NTP sources?
 Select NTP servers that are well synchronised, stable and close to your
 network. It's better to use more than one server, three or four is usually
 recommended as the minimum, so `chronyd` can detect servers that serve false
 time and combine measurements from multiple sources.
 If you have a network card with hardware timestamping supported on Linux, it
 can be enabled by the *hwtimestamp* directive in the _chrony.conf_ file. It
 should make local receive and transmit timestamps of NTP packets much more
 accurate.
 There are also useful options which can be set in the `server` directive, they
 are `minpoll`, `maxpoll`, `polltarget`, `maxdelay`, `maxdelayratio`,
 `maxdelaydevratio`, and `xleave`.
 The first three options set the minimum and maximum allowed polling interval,
 and how should be the actual interval adjusted in the specified range. Their
 default values are 6 (64 seconds) for `minpoll`, 10 (1024 seconds) for
 `maxpoll` and 8 (samples) for `polltarget`. The default values should be used
 for general servers on the Internet. With your own NTP servers, or if you have
 permission to poll some servers more frequently, setting these options for
 shorter polling intervals may significantly improve the accuracy of the system
 clock.
 The optimal polling interval depends mainly on two factors, stability of the
 network latency and stability of the system clock (which mainly depends on the
 temperature sensitivity of the crystal oscillator and the maximum rate of the
 temperature change).
 Generally, if the `sourcestats` command usually reports a small number of
 samples retained for a source (e.g. fewer than 16), a shorter polling interval
 should be considered. If the number of samples is usually at the maximum of 64,
 a longer polling interval may work better.
 An example of the directive for an NTP server on the Internet that you are
 allowed to poll frequently could be
 ----
 server foo.example.net minpoll 4 maxpoll 6 polltarget 16
 ----
 An example using shorter polling intervals with a server located in the same
 LAN could be
 ----
 server ntp.local minpoll 2 maxpoll 4 polltarget 30
 ----
 The maxdelay options are useful to ignore measurements with an unusally large
 delay (e.g. due to congestion in the network) and improve the stability of the
 synchronisation. The `maxdelaydevratio` option could be added to the example
 with local NTP server
 ----
 server ntp.local minpoll 2 maxpoll 4 polltarget 30 maxdelaydevratio 2
 ----
 If your server supports the interleaved mode (e.g. it is running `chronyd`),
 the `xleave` option should be added to the `server` directive in order to allow
 the server to send the client more accurate transmit timestamps (kernel or
 preferably hardware). For example:
 ----
 server ntp.local minpoll 2 maxpoll 4 xleave
 ----
 When combined with local hardware timestamping, good network switches, and even
 shorter polling intervals, a sub-microsecond accuracy and stability of a few
 tens of nanoseconds may be possible. For example:
 ----
 server ntp.local minpoll 0 maxpoll 0 xleave
 hwtimestamp eth0
 ----
 For best stability, the CPU should be running at a constant frequency (i.e.
 disabled power saving and performance boosting). Energy-Efficient Ethernet
 (EEE) should be disabled in the network. The switches should be configured to
 prioritize NTP packets, especially if the network is expected to be heavily
 loaded.
 If it is acceptable for NTP clients in the network to send requests at an
 excessive rate, a sub-second polling interval may be specified. A median filter
 can be enabled in order to update the clock at a reduced rate with more stable
 measurements. For example:
 ----
 server ntp.local minpoll -6 maxpoll -6 filter 15 xleave
 hwtimestamp eth0 minpoll -6
 ----
 === Does `chronyd` have an ntpdate mode?
 Yes. With the `-q` option `chronyd` will set the system clock once and exit.
 With the `-Q` option it will print the measured offset without setting the
 clock. If you don't want to use a configuration file, NTP servers can be
 specified on the command line. For example:
 ----
 # chronyd -q 'pool pool.ntp.org iburst'
 ----
 === Can `chronyd` be configured to control the clock like `ntpd`?
 It is not possible to perfectly emulate `ntpd`, but there are some options that
 can configure `chronyd` to behave more like `ntpd`.
 In the following example the `minsamples` directive slows down the response to
 changes in the frequency and offset of the clock. The `maxslewrate` and
 `corrtimeratio` directives reduce the maximum frequency error due to an offset
 correction and the `maxdrift` directive reduces the maximum assumed frequency
 error of the clock. The `makestep` directive enables a step threshold and the
 `maxchange` directive enables a panic threshold. The `maxclockerror` directive
 increases the minimum dispersion rate.
 ----
 minsamples 32
 maxslewrate 500
 corrtimeratio 100
 maxdrift 500
 makestep 0.128 -1
 maxchange 1000 1 1
 maxclockerror 15
 ----
 Note that increasing `minsamples` may cause the offsets in the `tracking` and
 `sourcestats` reports/logs to be significantly smaller than the actual offsets
 and be unsuitable for monitoring.
 === What happened to the `commandkey` and `generatecommandkey` directives?
 They were removed in version 2.2. Authentication is no longer supported in the
 command protocol. Commands that required authentication are now allowed only
 through a Unix domain socket, which is accessible only by the root and _chrony_
 users. If you need to configure `chronyd` remotely or locally without the root
 password, please consider using ssh and/or sudo to run `chronyc` under the root
 or _chrony_ user on the host where `chronyd` is running.
 == Computer is not synchronising
 This is the most common problem. There are a number of reasons, see the
 following questions.
 === Behind a firewall?
 Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it's
 zero, it means `chronyd` did not get any valid responses from the NTP server
 you are trying to use. If there is a firewall between you and the server, the
 packets may be blocked. Try using a tool like `wireshark` or `tcpdump` to see
 if you're getting any responses from the server.
 When `chronyd` is receiving responses from the servers, the output of the
 `sources` command issued few minutes after `chronyd` start might look like
 this:
 ----
 210 Number of sources = 3
 MS Name/IP address         Stratum Poll Reach LastRx Last sample
 ===============================================================================
 ^* foo.example.net               2   6   377    34   +484us[ -157us] +/-   30ms
 ^- bar.example.net               2   6   377    34    +33ms[  +32ms] +/-   47ms
 ^+ baz.example.net               3   6   377    35  -1397us[-2033us] +/-   60ms
 ----
 === Are NTP servers specified with the `offline` option?
 Check that you're using ``chronyc``'s `online` and `offline` commands
 appropriately. The `activity` command prints the number of sources that are
 currently online and offline. For example:
 ----
 200 OK
 3 sources online
 0 sources offline
 0 sources doing burst (return to online)
 0 sources doing burst (return to offline)
 0 sources with unknown address
 ----
 === Is `chronyd` allowed to step the system clock?
 By default, `chronyd` adjusts the clock gradually by slowing it down or
 speeding it up. If the clock is too far from the true time, it will take
 a long time to correct the error. The `System time` value printed by the
 ``chronyc``'s `tracking` command is the remaining correction that needs to be
 applied to the system clock.
 The `makestep` directive can be used to allow `chronyd` to step the clock. For
 example, if _chrony.conf_ had
 ----
 makestep 1 3
 ----
 the clock would be stepped in the first three updates if its offset was larger
 than one second. Normally, it's recommended to allow the step only in the first
 few updates, but in some cases (e.g. a computer without an RTC or virtual
 machine which can be suspended and resumed with an incorrect time) it may be
 necessary to allow the step on any clock update. The example above would change
 to
 ----
 makestep 1 -1
 ----
 === Using a Windows NTP server?
 A common issue with Windows NTP servers is that they report a very large root
 dispersion (e.g. three seconds or more), which causes `chronyd` to ignore the
 server for being too inaccurate. The `sources` command may show a valid
 measurement, but the server is not selected for synchronisation. You can check
 the root dispersion of the server with the ``chronyc``'s `ntpdata` command.
 The `maxdistance` value needs to be increased in _chrony.conf_ to enable
 synchronisation to such a server. For example:
 ----
 maxdistance 16.0
 ----
 === Using a PPS reference clock?
 A pulse-per-second (PPS) reference clock requires a non-PPS time source to
 determine which second of UTC corresponds to each pulse. If it is another
 reference clock specified with the `lock` option in the `refclock` directive,
 the offset between the two reference clocks must be smaller than 0.2 seconds in
 order for the PPS reference clock to work. With NMEA reference clocks it is
 common to have a larger offset. It needs to be corrected with the `offset`
 option.
 One approach to find out a good value of the `offset` option is to configure
 the reference clocks with the `noselect` option and compare them to an NTP
 server. For example, if the `sourcestats` command showed
 ----
 Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
 ==============================================================================
 PPS0                        0   0     0     +0.000   2000.000     +0ns  4000ms
 NMEA                       58  30   231    -96.494     38.406   +504ms  6080us
 foo.example.net             7   3   200     -2.991     16.141   -107us   492us
 ----
 the offset of the NMEA source would need to be increased by about 0.504
 seconds. It does not have to be very accurate. As long as the offset of the
 NMEA reference clock stays below 0.2 seconds, the PPS reference clock should be
 able to determine the seconds corresponding to the pulses and allow the samples
 to be used for synchronisation.
 == Issues with `chronyc`
 === I keep getting the error `506 Cannot talk to daemon`
 When accessing `chronyd` remotely, make sure that the _chrony.conf_ file (on
 the computer where `chronyd` is running) has a `cmdallow` entry for the
 computer you are running `chronyc` on and an appropriate `bindcmdaddress`
 directive. This isn't necessary for localhost.
 Perhaps `chronyd` is not running. Try using the `ps` command (e.g. on Linux,
 `ps -auxw`) to see if it's running. Or try `netstat -a` and see if the ports
 123/udp and 323/udp are listening. If `chronyd` is not running, you may have a
 problem with the way you are trying to start it (e.g. at boot time).
 Perhaps you have a firewall set up in a way that blocks packets on port
 323/udp. You need to amend the firewall configuration in this case.
 === I keep getting the error `501 Not authorised`
 Since version 2.2, the `password` command doesn't do anything and `chronyc`
 needs to run locally under the root or _chrony_ user, which are allowed to
 access the ``chronyd``'s Unix domain command socket.
 With older versions, you need to authenticate with the `password` command first
 or use the `-a` option to authenticate automatically on start. The
 configuration file needs to specify a file which contains keys (`keyfile`
 directive) and which key in the key file should be used for `chronyc`
 authentication (`commandkey` directive).
 === Why does `chronyc tracking` always print an IPv4 address as reference ID?
 The reference ID is a 32-bit value and in versions before 3.0 it was printed in
 quad-dotted notation, even if the reference source did not actually have an
 IPv4 address. For IPv4 addresses, the reference ID is equal to the address, but
 for IPv6 addresses it is the first 32 bits of the MD5 sum of the address. For
 reference clocks, the reference ID is the value specified with the `refid`
 option in the `refclock` directive.
 Since version 3.0, the reference ID is printed as a hexadecimal number to avoid
 confusion with IPv4 addresses.
 If you need to get the IP address of the current reference source, use the `-n`
 option to disable resolving of IP addresses and read the second field (printed
 in parentheses) on the `Reference ID` line.
 === Is the `chronyc` / `chronyd` protocol documented anywhere?
 Only by the source code. See _cmdmon.c_ (`chronyd` side) and _client.c_
 (`chronyc` side).
 == Real-time clock issues
 === What is the real-time clock (RTC)?
 This is the clock which keeps the time even when your computer is turned off.
 It is used to initialise the system clock on boot. It normally doesn't drift
 more than few seconds per day.
 There are two approaches how `chronyd` can work with it. One is to use the
 `rtcsync` directive, which tells `chronyd` to enable a kernel mode which sets
 the RTC from the system clock every 11 minutes. `chronyd` itself won't touch
 the RTC. If the computer is not turned off for a long time, the RTC should
 still be close to the true time when the system clock will be initialised from
 it on the next boot.
 The other option is to use the `rtcfile` directive, which tells `chronyd` to
 monitor the rate at which the RTC gains or loses time. When `chronyd` is
 started with the `-s` option on the next boot, it will set the system time from
 the RTC and also compensate for the drift it has measured previously. The
 `rtcautotrim` directive can be used to keep the RTC close to the true time, but
 it's not strictly necessary if its only purpose is to set the system clock when
 `chronyd` is started on boot. See the documentation for details.
 === I want to use ``chronyd``'s RTC support. Must I disable `hwclock`?
 The `hwclock` program is often set-up by default in the boot and shutdown
 scripts with many Linux installations. With the kernel RTC synchronisation
 (`rtcsync` directive), the RTC will be set also every 11 minutes as long as the
 system clock is synchronised. If you want to use ``chronyd``'s RTC monitoring
 (`rtcfile` directive), it's important to disable `hwclock` in the shutdown
 procedure. If you don't, it will over-write the RTC with a new value, unknown
 to `chronyd`. At the next reboot, `chronyd` started with the `-s` option will
 compensate this (wrong) time with its estimate of how far the RTC has drifted
 whilst the power was off, giving a meaningless initial system time.
 There is no need to remove `hwclock` from the boot process, as long as `chronyd`
 is started after it has run.
 === I just keep getting the `513 RTC driver not running` message
 For the real-time clock support to work, you need the following three
 things
 * an RTC in your computer
 * a Linux kernel with enabled RTC support
 * an `rtcfile` directive in your _chrony.conf_ file
 === I get `Could not open /dev/rtc, Device or resource busy` in my syslog file
 Some other program running on the system may be using the device.
 === What if my computer does not have an RTC or backup battery?
 In this case you can still use the `-s` option to set the system clock to the
 last modification time of the drift file, which should correspond to the system
 time when `chronyd` was previously stopped. The initial system time will be
 increasing across reboots and applications started after `chronyd` will not
 observe backward steps.
 == NTP-specific issues
 === Can `chronyd` be driven from broadcast/multicast NTP servers?
 No, the broadcast/multicast client mode is not supported and there is currently
 no plan to implement it. While the mode may be useful to simplify configuration
 of clients in large networks, it is inherently less accurate and less secure
 (even with authentication) than the ordinary client/server mode.
 When configuring a large number of clients in a network, it is recommended to
 use the `pool` directive with a DNS name which resolves to addresses of
 multiple NTP servers. The clients will automatically replace the servers when
 they become unreachable, or otherwise unsuitable for synchronisation, with new
 servers from the pool.
 Even with very modest hardware, an NTP server can serve time to hundreds of
 thousands of clients using the ordinary client/server mode.
 === Can `chronyd` transmit broadcast NTP packets?
 Yes, the `broadcast` directive can be used to enable the broadcast server mode
 to serve time to clients in the network which support the broadcast client mode
 (it's not supported in `chronyd`, see the previous question).
 === Can `chronyd` keep the system clock a fixed offset away from real time?
 Yes. Starting from version 3.0, an offset can be specified by the `offset`
 option for all time sources in the _chrony.conf_ file.
 === What happens if the network connection is dropped without using ``chronyc``'s `offline` command first?
 `chronyd` will keep trying to access the sources that it thinks are online, and
 it will take longer before new measurements are actually made and the clock is
 corrected when the network is connected again. If the sources were set to
 offline, `chronyd` would make new measurements immediately after issuing the
 `online` command.
 Unless the network connection lasts only few minutes (less than the maximum
 polling interval), the delay is usually not a problem, and it may be acceptable
 to keep all sources online all the time.
 == Operating systems
 === Does `chrony` support Windows?
 No. The `chronyc` program (the command-line client used for configuring
 `chronyd` while it is running) has been successfully built and run under
 Cygwin in the past. `chronyd` is not portable, because part of it is
 very system-dependent. It needs adapting to work with Windows'
 equivalent of the adjtimex() call, and it needs to be made to work as a
 service.
 === Are there any plans to support Windows?
 We have no plans to do this. Anyone is welcome to pick this work up and
 contribute it back to the project.
--- a/doc/installation.adoc
+++ b/doc/installation.adoc
@@ -1,230 +0,0 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Miroslav Lichvar  2009-2016
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
 // published by the Free Software Foundation.
 //
 // This program is distributed in the hope that it will be useful, but
 // WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 // General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License along
 // with this program; if not, write to the Free Software Foundation, Inc.,
 // 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 = Installation
 The software is distributed as source code which has to be compiled. The source
 code is supplied in the form of a gzipped tar file, which unpacks to a
 subdirectory identifying the name and version of the program.
 The following programs and libraries with their development files are needed to
 build `chrony`:
 * C compiler (gcc or clang recommended)
 * GNU Make
 * Nettle, NSS, or LibTomCrypt (optional)
 * Editline (optional)
 * libcap (Linux only, optional)
 * libseccomp (Linux only, optional)
 * timepps.h header (optional)
 * Asciidoctor (for HTML documentation)
 * Bash (for testing)
 After unpacking the source code, change directory into it, and type
 ----
 ./configure
 ----
 This is a shell script that automatically determines the system type. There is
 an optional parameter `--prefix`, which indicates the directory tree where the
 software should be installed. For example,
 ----
 ./configure --prefix=/opt/free
 ----
 will install the `chronyd` daemon into `/opt/free/sbin` and the `chronyc`
 control program into `/opt/free/bin`. The default value for the prefix is
 `/usr/local`.
 The `configure` script assumes you want to use `gcc` as your compiler. If you
 want to use a different compiler, you can configure this way:
 ----
 CC=cc ./configure --prefix=/opt/free
 ----
 for Bourne-family shells, or
 ----
 setenv CC cc
 setenv CFLAGS -O
 ./configure --prefix=/opt/free
 ----
 for C-family shells.
 If the software cannot (yet) be built on your system, an error message will be
 shown. Otherwise, `Makefile` will be generated.
 On Linux, if development files for the libcap library are available, `chronyd`
 will be built with support for dropping root privileges. On other systems no
 extra library is needed. The default user which `chronyd` should run as can be
 specified with the `--with-user` option of the `configure` script.
 If development files for the POSIX threads library are available, `chronyd`
 will be built with support for asynchronous resolving of hostnames specified in
 the `server`, `peer`, and `pool` directives. This allows `chronyd` operating as
 a server to respond to client requests when resolving a hostname. If you don't
 want to enable the support, specify the `--disable-asyncdns` flag to
 `configure`.
 If development files for the https://www.lysator.liu.se/~nisse/nettle/[Nettle],
 https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS[NSS], or
 http://www.libtom.net/LibTomCrypt/[libtomcrypt] library are available,
 `chronyd` will be built with support for other cryptographic hash functions
 than MD5, which can be used for NTP authentication with a symmetric key. If you
 don't want to enable the support, specify the `--disable-sechash` flag to
 `configure`.
 If development files for the editline or readline library are available,
 `chronyc` will be built with line editing support. If you don't want this,
 specify the `--disable-readline` flag to `configure`.
 If a `timepps.h` header is available (e.g. from the
 http://linuxpps.org[LinuxPPS project]), `chronyd` will be built with PPS API
 reference clock driver. If the header is installed in a location that isn't
 normally searched by the compiler, you can add it to the searched locations by
 setting the `CPPFLAGS` variable to `-I/path/to/timepps`.
 The `--help` option can be specified to `configure` to print all options
 supported by the script.
 Now type
 ----
 make
 ----
 to build the programs.
 If you want to build the manual in HTML, type
 ----
 make docs
 ----
 Once the programs have been successfully compiled, they need to be installed in
 their target locations. This step normally needs to be performed by the
 superuser, and requires the following command to be entered.
 ----
 make install
 ----
 This will install the binaries and man pages.
 To install the HTML version of the manual, enter the command
 ----
 make install-docs
 ----
 Now that the software is successfully installed, the next step is to set up a
 configuration file. The default location of the file is _/etc/chrony.conf_.
 Several examples of configuration with comments are included in the examples
 directory. Suppose you want to use public NTP servers from the pool.ntp.org
 project as your time reference. A minimal useful configuration file could be
 ----
 pool pool.ntp.org iburst
 makestep 1.0 3
 rtcsync
 ----
 Then, `chronyd` can be run. For security reasons, it's recommended to create an
 unprivileged user for `chronyd` and specify it with the `-u` command-line
 option or the `user` directive in the configuration file, or set the default
 user with the `--with-user` configure option before building.
 == Support for system call filtering
 `chronyd` can be built with support for the Linux secure computing (seccomp)
 facility. This requires development files for the
 https://github.com/seccomp/libseccomp[libseccomp] library and the
 `--enable-scfilter` option specified to `configure`. The `-F` option of
 `chronyd` will enable a system call filter, which should significantly reduce
 the kernel attack surface and possibly prevent kernel exploits from `chronyd`
 if it is compromised.
 == Support for line editing libraries
 `chronyc` can be built with support for line editing, this allows you to use
 the cursor keys to replay and edit old commands. Two libraries are supported
 which provide such functionality, editline and GNU readline.
 Please note that readline since version 6.0 is licensed under GPLv3+ which is
 incompatible with chrony's license GPLv2. You should use editline instead if
 you don't want to use older readline versions.
 The `configure` script will automatically enable the line editing support if
 one of the supported libraries is available. If they are both available, the
 editline library will be used.
 If you don't want to use it (in which case `chronyc` will use a minimal command
 line interface), invoke `configure` like this:
 ----
 ./configure --disable-readline other-options...
 ----
 If you have editline, readline or ncurses installed in locations that aren't
 normally searched by the compiler and linker, you need to use extra options:
 `--with-readline-includes=directory_name`::
  This defines the name of the directory above the one where `readline.h` is.
  `readline.h` is assumed to be in `editline` or `readline` subdirectory of the
  named directory.
 `--with-readline-library=directory_name`::
  This defines the directory containing the `libedit.a` or `libedit.so` file,
  or `libreadline.a` or `libreadline.so` file.
 `--with-ncurses-library=directory_name`::
  This defines the directory containing the `libncurses.a` or `libncurses.so`
  file.
 == Extra options for package builders
 The `configure` and `make` procedures have some extra options that may be
 useful if you are building a distribution package for `chrony`.
 The `--mandir=DIR` option to `configure` specifies an installation directory
 for the man pages. This overrides the `man` subdirectory of the argument to the
 `--prefix` option.
 ----
 ./configure --prefix=/usr --mandir=/usr/share/man
 ----
 to set both options together.
 The final option is the `DESTDIR` option to the `make` command. For example,
 you could use the commands
 ----
 ./configure --prefix=/usr --mandir=/usr/share/man
 make all docs
 make install DESTDIR=./tmp
 cd tmp
 tar cvf - . | gzip -9 > chrony.tar.gz
 ----
 to build a package. When untarred within the root directory, this will install
 the files to the intended final locations.
--- a/examples/chrony-wait.service
+++ b/examples/chrony-wait.service
@@ -1,6 +1,5 @@
 [Unit]
 Description=Wait for chrony to synchronize system clock
 Documentation=man:chronyc(1)
 After=chronyd.service
 Requires=chronyd.service
 Before=time-sync.target
@@ -10,7 +9,7 @@ Wants=time-sync.target
 Type=oneshot
 # Wait up to ~10 minutes for chronyd to synchronize and the remaining
 # clock correction to be less than 0.1 seconds
-ExecStart=/usr/bin/chronyc -h 127.0.0.1,::1 waitsync 600 0.1 0.0 1
+ExecStart=/usr/bin/chronyc waitsync 60 0.1
 RemainAfterExit=yes
 StandardOutput=null
--- a/examples/chrony.conf.example3
+++ b/examples/chrony.conf.example3
@@ -5,6 +5,22 @@
 # want to enable.  The more obscure options are not included.  Refer
 # to the documentation for these.
 #
 # Copyright 2002 Richard P. Curnow
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of version 2 of the GNU General Public License as
 # published by the Free Software Foundation.
 # 
 # This program is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # General Public License for more details.
 # 
 # You should have received a copy of the GNU General Public License along
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 # 
 #
 #######################################################################
 ### COMMENTS
 # Any of the following lines are comments (you have a choice of
@@ -27,36 +43,44 @@
 # you can access at http://support.ntp.org/bin/view/Servers/WebHome or
 # you can use servers from the pool.ntp.org project.
-! server foo.example.net iburst
+! server 0.pool.ntp.org iburst
-! server bar.example.net iburst
+! server 1.pool.ntp.org iburst
-! server baz.example.net iburst
+! server 2.pool.ntp.org iburst
-! pool pool.ntp.org iburst
+# However, for dial-up use you probably want these instead.  The word
 # 'offline' means that the server is not visible at boot time.  Use
 # chronyc's 'online' command to tell chronyd that these servers have
 # become visible after you go on-line.
 ! server 0.pool.ntp.org offline
 ! server 1.pool.ntp.org offline
 ! server 2.pool.ntp.org offline
 # You may want to specify NTP 'peers' instead.  If you run a network
 # with a lot of computers and want several computers running chrony to
 # have the 'front-line' interface to the public NTP servers, you can
 # 'peer' these machines together to increase robustness.
 ! peer ntp0.my-company.com
 # There are other options to the 'server' and 'peer' directives that you
 # might want to use.  For example, you can ignore measurements whose
 # round-trip-time is too large (indicating that the measurement is
 # probably useless, because you don't know which way the measurement
 # message got held up.)  Consult the full documentation for details.
 #######################################################################
 ### AVOIDING POTENTIALLY BOGUS CHANGES TO YOUR CLOCK
 #
 # To avoid changes being made to your computer's gain/loss compensation
 # when the measurement history is too erratic, you might want to enable
-# one of the following lines.  The first seems good with servers on the
+# one of the following lines.  The first seems good for dial-up (or
-# Internet, the second seems OK for a LAN environment.
+# other high-latency connections like slow leased lines), the second
 # seems OK for a LAN environment.
 ! maxupdateskew 100
 ! maxupdateskew 5
 # If you want to increase the minimum number of selectable sources
 # required to update the system clock in order to make the
 # synchronisation more reliable, uncomment (and edit) the following
 # line.
 ! minsources 2
 # If your computer has a good stable clock (e.g. it is not a virtual
 # machine), you might also want to reduce the maximum assumed drift
 # (frequency error) of the clock (the value is specified in ppm).
 ! maxdrift 100
 #######################################################################
 ### FILENAMES ETC
 # Chrony likes to keep information about your computer's clock in files.
@@ -67,10 +91,23 @@
 driftfile /var/lib/chrony/drift
-# If you want to enable NTP authentication with symmetric keys, you will need
+# If you want to use the program called chronyc to configure aspects of
-# to uncomment the following line and edit the file to set up the keys.
+# chronyd's operation once it is running (e.g. tell it the Internet link
 # has gone up or down), you need a password.  This is stored in the
 # following keys file.  (You also need keys to support authenticated NTP
 # exchanges between cooperating machines.)  Again, this option is
 # assumed by default.
-! keyfile /etc/chrony.keys
+keyfile /etc/chrony.keys
 # Tell chronyd which numbered key in the file is used as the password
 # for chronyc. (You can pick any integer up to 2**32-1.  '1' is just a
 # default.  Using another value will _NOT_ increase security.)
 commandkey 1
 # With this directive a random password will be generated automatically.
 generatecommandkey
 # chronyd can save the measurement history for the servers to files when
 # it it exits.  This is useful in 2 situations:
@@ -95,26 +132,20 @@ driftfile /var/lib/chrony/drift
 # still running and bail out.  If you want to change the path to the PID
 # file, uncomment this line and edit it.  The default path is shown.
-! pidfile /var/run/chrony/chronyd.pid
+! pidfile /var/run/chronyd.pid
 # If the system timezone database is kept up to date and includes the
 # right/UTC timezone, chronyd can use it to determine the current
 # TAI-UTC offset and when will the next leap second occur.
 ! leapsectz right/UTC
 #######################################################################
 ### INITIAL CLOCK CORRECTION
 # This option is useful to quickly correct the clock on start if it's
-# off by a large amount.  The value '1.0' means that if the error is less
+# off by a large amount.  The value '10' means that if the error is less
-# than 1 second, it will be gradually removed by speeding up or slowing
+# than 10 seconds, it will be gradually removed by speeding up or
-# down your computer's clock until it is correct.  If the error is above
+# slowing down your computer's clock until it is correct.  If the error
-# 1 second, an immediate time jump will be applied to correct it.  The
+# is above 10 seconds, an immediate time jump will be applied to correct
-# value '3' means the step is allowed only in the first three updates of
+# it.  The value '1' means the step is allowed only on the first update
-# the clock.  Some software can get upset if the system clock jumps
+# of the clock.  Some software can get upset if the system clock jumps
 # (especially backwards), so be careful!
-! makestep 1.0 3
+! makestep 10 1
 #######################################################################
 ### LOGGING
@@ -175,22 +206,16 @@ driftfile /var/lib/chrony/drift
 # machine accesses it.  The information can be accessed by the 'clients'
 # command of chronyc.  You can disable this facility by uncommenting the
 # following line.  This will save a bit of memory if you have many
-# clients and it will also disable support for the interleaved mode.
+# clients.
 ! noclientlog
 # The clientlog size is limited to 512KB by default.  If you have many
-# clients, you might want to increase the limit.
+# clients, especially in many different subnets, you might want to
 # increase the limit. 
 ! clientloglimit 4194304
 # By default, chronyd tries to respond to all valid NTP requests from
 # allowed addresses.  If you want to limit the response rate for NTP
 # clients that are sending requests too frequently, uncomment and edit
 # the following line.
 ! ratelimit interval 3 burst 8
 #######################################################################
 ### REPORTING BIG CLOCK CHANGES
 # Perhaps you want to know if chronyd suddenly detects any large error
@@ -208,19 +233,13 @@ driftfile /var/lib/chrony/drift
 # several people, you need to set up a mailing list or sendmail alias
 # for them and use the address of that.)
-! mailonchange wibble@foo.example.net 0.5
+! mailonchange wibble@foobar.org 0.5
 #######################################################################
 ### COMMAND ACCESS
 # The program chronyc is used to show the current operation of chronyd
 # and to change parts of its configuration whilst it is running.
 # By default chronyd binds to the loopback interface.  Uncomment the
 # following lines to allow receiving command packets from remote hosts.
 ! bindcmdaddress 0.0.0.0
 ! bindcmdaddress ::
 # Normally, chronyd will only allow connections from chronyc on the same
 # machine as itself.  This is for security.  If you have a subnet
 # 192.168.*.* and you want to be able to use chronyc from any machine on
@@ -233,20 +252,10 @@ driftfile /var/lib/chrony/drift
 # syntax and meaning is the same as for 'allow' and 'deny', except that
 # 'cmdallow' and 'cmddeny' control access to the chronyd's command port.
-# Rate limiting can be enabled also for command packets.  (Note,
+# NOTE, even if the host where you run chronyc is granted access, you
-# commands from localhost are never limited.)
+# still need a command key set up and you have to know the password to
-
+# put into chronyc to allow you to modify chronyd's parameters.  By
-! cmdratelimit interval -4 burst 16
+# default all you can do is view information about chronyd's operation.
 #######################################################################
 ### HARDWARE TIMESTAMPING
 # On Linux, if the network interface controller and its driver support
 # hardware timestamping, it can significantly improve the accuracy of
 # synchronisation. It can be enabled on specified interfaces only, or it
 # can be enabled on all interfaces that support it.
 ! hwtimestamp eth0
 ! hwtimestamp *
 #######################################################################
 ### REAL TIME CLOCK
@@ -277,12 +286,6 @@ driftfile /var/lib/chrony/drift
 ! rtcdevice /dev/misc/rtc
 # Alternatively, if not using the -s option, this directive can be used
 # to enable a mode in which the RTC is periodically set to the system
 # time, with no tracking of its drift.
 ! rtcsync
 #######################################################################
 ### REAL TIME SCHEDULER
 # This directive tells chronyd to use the real-time FIFO scheduler with the
--- a/examples/chrony.conf.example1
+++ b/examples/chrony.conf.example1
@@ -1,12 +0,0 @@
 # Use public NTP servers from the pool.ntp.org project.
 pool pool.ntp.org iburst
 # Record the rate at which the system clock gains/losses time.
 driftfile /var/lib/chrony/drift
 # Allow the system clock to be stepped in the first three updates
 # if its offset is larger than 1 second.
 makestep 1.0 3
 # Enable kernel synchronization of the real-time clock (RTC).
 rtcsync
--- a/examples/chrony.conf.example2
+++ b/examples/chrony.conf.example2
@@ -1,38 +1,46 @@
 # Use public servers from the pool.ntp.org project.
 # Please consider joining the pool (http://www.pool.ntp.org/join.html).
-pool pool.ntp.org iburst
+server 0.pool.ntp.org iburst
 server 1.pool.ntp.org iburst
 server 2.pool.ntp.org iburst
 server 3.pool.ntp.org iburst
 # Ignore stratum in source selection.
 stratumweight 0
 # Record the rate at which the system clock gains/losses time.
 driftfile /var/lib/chrony/drift
-# Allow the system clock to be stepped in the first three updates
+# Enable kernel RTC synchronization.
 # if its offset is larger than 1 second.
 makestep 1.0 3
 # Enable kernel synchronization of the real-time clock (RTC).
 rtcsync
-# Enable hardware timestamping on all interfaces that support it.
+# In first three updates step the system clock instead of slew
-#hwtimestamp *
+# if the adjustment is larger than 10 seconds.
-
+makestep 10 3
 # Increase the minimum number of selectable sources required to adjust
 # the system clock.
 #minsources 2
 # Allow NTP client access from local network.
-#allow 192.168.0.0/16
+#allow 192.168/16
-# Serve time even if not synchronized to a time source.
+# Listen for commands only on localhost.
 bindcmdaddress 127.0.0.1
 bindcmdaddress ::1
 # Serve time even if not synchronized to any NTP server.
 #local stratum 10
-# Specify file containing keys for NTP authentication.
+keyfile /etc/chrony.keys
 #keyfile /etc/chrony.keys
-# Get TAI-UTC offset and leap seconds from the system tz database.
+# Specify the key used as password for chronyc.
-#leapsectz right/UTC
+commandkey 1
 # Generate command key if missing.
 generatecommandkey
 # Disable logging of client accesses.
 noclientlog
 # Send a message to syslog if a clock adjustment is larger than 0.5 seconds.
 logchange 0.5
 # Specify directory for log files.
 logdir /var/log/chrony
 # Select which information is logged.
 #log measurements statistics tracking
--- a/examples/chrony.keys.example
+++ b/examples/chrony.keys.example
@@ -1,13 +1,29 @@
-# This is an example chrony keys file.  It enables authentication of NTP
+#######################################################################
 # packets with symmetric keys when its location is specified by the keyfile
 # directive in chrony.conf(5).  It should be readable only by root and the
 # user under which chronyd is running.
 #
-# Don't use the example keys!  It's recommended to generate random keys using
+# This is an example chrony keys file.  You should copy it to /etc/chrony.keys
-# the chronyc keygen command.
+# after editing it to set up the key(s) you want to use.  It should be readable
 # only by root or the user chronyd drops the root privileges to.  In most
 # situations, you will require a single key (the 'commandkey') so that you can
 # supply a password to chronyc to enable you to modify chronyd's operation
 # whilst it is running.
 #
 # Copyright 2002 Richard P. Curnow
 #
 ######################################################################
 # Examples of valid keys:
-#1 MD5 AVeryLongAndRandomPassword
+#1 ALongAndRandomPassword
-#2 MD5 HEX:12114855C7931009B4049EF3EFC48A139C3F989F
+#2 MD5 HEX:B028F91EA5C38D06C2E140B26C7F41EC
-#3 SHA1 HEX:B2159C05D6A219673A3B7E896B6DE07F6A440995
+#3 SHA1 HEX:1DC764E0791B11FA67EFC7ECBC4B0D73F68A070C
 # The keys should be random for maximum security.  If you wanted to use a key
 # with ID 1 as your commandkey (i.e. chronyc password) you would put
 # "commandkey 1" into chrony.conf.  If no commandkey is present in the keys
 # file and the generatecommandkey directive is specified in chrony.conf,
 # a random commandkey will be generated and added to the keys file
 # automatically on chronyd start.
 # You might want to define more keys if you use the authentication facility
 # in the network time protocol to authenticate request/response packets between
 # trusted clients and servers.
--- a/examples/chrony.logrotate
+++ b/examples/chrony.logrotate
@@ -3,6 +3,6 @@
    nocreate
    sharedscripts
    postrotate
-        /usr/bin/chronyc cyclelogs > /dev/null 2>&1 || true
+        /usr/bin/chronyc -a cyclelogs > /dev/null 2>&1 || true
    endscript
 }
--- a/examples/chrony.nm-dispatcher
+++ b/examples/chrony.nm-dispatcher
@@ -1,15 +1,17 @@
 #!/bin/sh
-# This is a NetworkManager dispatcher / networkd-dispatcher script for
+# This is a NetworkManager dispatcher script for chronyd to set its NTP sources
-# chronyd to set its NTP sources online or offline when a network interface
+# online/offline when a default route is configured/removed on the system.
 # is configured or removed
 export LC_ALL=C
-# For NetworkManager consider only up/down events
+if [ "$2" = "up" ]; then
-[ $# -ge 2 ] && [ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
+	/sbin/ip route list dev "$1" | grep -q '^default' &&
 		/usr/bin/chronyc -a online > /dev/null 2>&1
 fi
-# Note: for networkd-dispatcher routable.d ~= on and off.d ~= off
+if [ "$2" = "down" ]; then
-
+	/sbin/ip route list | grep -q '^default' ||
-chronyc onoffline > /dev/null 2>&1
+		/usr/bin/chronyc -a offline > /dev/null 2>&1
 fi
 exit 0
--- a/examples/chrony.spec
+++ b/examples/chrony.spec
@@ -0,0 +1,57 @@
 %global chrony_version @@VERSION@@
 %if 0%(echo %{chrony_version} | grep -q pre && echo 1)
 %global prerelease %(echo %{chrony_version} | sed 's/.*-//')
 %endif
 Summary: An NTP client/server
 Name: chrony
 Version: %(echo %{chrony_version} | sed 's/-.*//')
 Release: %{!?prerelease:1}%{?prerelease:0.1.%{prerelease}}
 Source: chrony-%{version}%{?prerelease:-%{prerelease}}.tar.gz
 License: GPLv2
 Group: Applications/Utilities
 BuildRoot: %{_tmppath}/%{name}-%{version}-root-%(id -u -n)
 Requires: info
 %description
 chrony is a client and server for the Network Time Protocol (NTP).
 This program keeps your computer's clock accurate. It was specially
 designed to support systems with intermittent Internet connections,
 but it also works well in permanently connected environments. It can
 also use hardware reference clocks, the system real-time clock, or
 manual input as time references.
 %prep
 %setup -q -n %{name}-%{version}%{?prerelease:-%{prerelease}}
 %build
 ./configure \
 	--prefix=%{_prefix} \
 	--bindir=%{_bindir} \
 	--sbindir=%{_sbindir} \
 	--infodir=%{_infodir} \
 	--mandir=%{_mandir}
 make
 make chrony.txt
 make chrony.info
 %install
 rm -rf $RPM_BUILD_ROOT
 make install DESTDIR=$RPM_BUILD_ROOT
 rm -rf $RPM_BUILD_ROOT%{_docdir}
 mkdir -p $RPM_BUILD_ROOT%{_infodir}
 cp chrony.info* $RPM_BUILD_ROOT%{_infodir}
 %files
 %{_sbindir}/chronyd
 %{_bindir}/chronyc
 %{_infodir}/chrony.info*
 %{_mandir}/man1/chrony.1.gz
 %{_mandir}/man1/chronyc.1.gz
 %{_mandir}/man5/chrony.conf.5.gz
 %{_mandir}/man8/chronyd.8.gz
 %doc README
 %doc chrony.txt
 %doc COPYING
 %doc examples/chrony.conf.example*
 %doc examples/chrony.keys.example
--- a/examples/chronyd.service
+++ b/examples/chronyd.service
@@ -1,18 +1,13 @@
 [Unit]
 Description=NTP client/server
 Documentation=man:chronyd(8) man:chrony.conf(5)
 After=ntpdate.service sntp.service ntpd.service
 Conflicts=ntpd.service systemd-timesyncd.service
 ConditionCapability=CAP_SYS_TIME
 [Service]
 Type=forking
-PIDFile=/run/chrony/chronyd.pid
+PIDFile=/var/run/chronyd.pid
 EnvironmentFile=-/etc/sysconfig/chronyd
 ExecStart=/usr/sbin/chronyd $OPTIONS
 PrivateTmp=yes
 ProtectHome=yes
 ProtectSystem=full
 [Install]
 WantedBy=multi-user.target
--- a/getdate.c
+++ b/getdate.c
--- a/getdate.y
+++ b/getdate.y
@@ -8,7 +8,12 @@
 **  This code is in the public domain and has no copyright.
 */
-#include "config.h"
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 # ifdef HAVE_ALLOCA_H
 #  include <alloca.h>
 # endif
 #endif
 /* Since the code of getdate.y is not included in the Emacs executable
   itself, there is no need to #define static in this file.  Even if
--- a/hash.h
+++ b/hash.h
@@ -38,6 +38,4 @@ extern unsigned int HSH_Hash(int id,
    const unsigned char *in2, unsigned int in2_len,
    unsigned char *out, unsigned int out_len);
 extern void HSH_Finalise(void);
 #endif
--- a/hash_intmd5.c
+++ b/hash_intmd5.c
@@ -29,7 +29,6 @@
 #include "sysincl.h"
 #include "hash.h"
 #include "memory.h"
 #include "util.h"
 #include "md5.c"
@@ -50,20 +49,16 @@ HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
    const unsigned char *in2, unsigned int in2_len,
    unsigned char *out, unsigned int out_len)
 {
  if (out_len < 16)
    return 0;
  MD5Init(&ctx);
  MD5Update(&ctx, in1, in1_len);
  if (in2)
    MD5Update(&ctx, in2, in2_len);
  MD5Final(&ctx);
-  out_len = MIN(out_len, 16);
+  memcpy(out, ctx.digest, 16);
-  memcpy(out, ctx.digest, out_len);
+  return 16;
  return out_len;
 }
 void
 HSH_Finalise(void)
 {
 }
--- a/hash_nettle.c
+++ b/hash_nettle.c
@@ -1,120 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2018
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Routines implementing crypto hashing using the nettle library.
  */
 #include "config.h"
 #include "sysincl.h"
 #include <nettle/nettle-meta.h>
 #include "hash.h"
 #include "memory.h"
 struct hash {
  const char *name;
  const char *int_name;
  const struct nettle_hash *nettle_hash;
  void *context;
 };
 static struct hash hashes[] = {
  { "MD5", "md5", NULL, NULL },
  { "RMD160", "ripemd160", NULL, NULL },
  { "SHA1", "sha1", NULL, NULL },
  { "SHA256", "sha256", NULL, NULL },
  { "SHA384", "sha384", NULL, NULL },
  { "SHA512", "sha512", NULL, NULL },
  { "SHA3-224", "sha3_224", NULL, NULL },
  { "SHA3-256", "sha3_256", NULL, NULL },
  { "SHA3-384", "sha3_384", NULL, NULL },
  { "SHA3-512", "sha3_512", NULL, NULL },
  { NULL, NULL, NULL, NULL }
 };
 int
 HSH_GetHashId(const char *name)
 {
  int id, nid;
  for (id = 0; hashes[id].name; id++) {
    if (!strcmp(name, hashes[id].name))
      break;
  }
  if (!hashes[id].name)
    return -1;
  if (hashes[id].context)
    return id;
  for (nid = 0; nettle_hashes[nid]; nid++) {
    if (!strcmp(hashes[id].int_name, nettle_hashes[nid]->name))
      break;
  }
  if (!nettle_hashes[nid] || !nettle_hashes[nid]->context_size || !nettle_hashes[nid]->init)
    return -1;
  hashes[id].nettle_hash = nettle_hashes[nid];
  hashes[id].context = Malloc(hashes[id].nettle_hash->context_size);
  return id;
 }
 unsigned int
 HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
         const unsigned char *in2, unsigned int in2_len,
         unsigned char *out, unsigned int out_len)
 {
  const struct nettle_hash *hash;
  void *context;
  hash = hashes[id].nettle_hash;
  context = hashes[id].context;
  if (out_len > hash->digest_size)
    out_len = hash->digest_size;
  hash->init(context);
  hash->update(context, in1_len, in1);
  if (in2)
    hash->update(context, in2_len, in2);
  hash->digest(context, out_len, out);
  return out_len;
 }
 void
 HSH_Finalise(void)
 {
  int i;
  for (i = 0; hashes[i].name; i++) {
    if (hashes[i].context)
      Free(hashes[i].context);
  }
 }
--- a/hash_nss.c
+++ b/hash_nss.c
@@ -25,14 +25,12 @@
  */
 #include "config.h"
 #include <nss.h>
 #include <hasht.h>
 #include <nsslowhash.h>
 /* #include "config.h" */
 #include "hash.h"
 #include "util.h"
 static NSSLOWInitContext *ictx;
@@ -79,31 +77,13 @@ HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
    const unsigned char *in2, unsigned int in2_len,
    unsigned char *out, unsigned int out_len)
 {
-  unsigned char buf[MAX_HASH_LENGTH];
+  unsigned int ret;
  unsigned int ret = 0;
  NSSLOWHASH_Begin(hashes[id].context);
  NSSLOWHASH_Update(hashes[id].context, in1, in1_len);
  if (in2)
    NSSLOWHASH_Update(hashes[id].context, in2, in2_len);
-  NSSLOWHASH_End(hashes[id].context, buf, &ret, sizeof (buf));
+  NSSLOWHASH_End(hashes[id].context, out, &ret, out_len);
  ret = MIN(ret, out_len);
  memcpy(out, buf, ret);
  return ret;
 }
 void
 HSH_Finalise(void)
 {
  int i;
  for (i = 0; hashes[i].name; i++) {
    if (hashes[i].context)
      NSSLOWHASH_Destroy(hashes[i].context);
  }
  if (ictx)
    NSSLOW_Shutdown(ictx);
 }
--- a/hash_tomcrypt.c
+++ b/hash_tomcrypt.c
@@ -2,7 +2,7 @@
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
- * Copyright (C) Miroslav Lichvar  2012, 2018
+ * Copyright (C) Miroslav Lichvar  2012
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -29,7 +29,6 @@
 #include "config.h"
 #include "hash.h"
 #include "util.h"
 struct hash {
  const char *name;
@@ -63,12 +62,6 @@ static const struct hash hashes[] = {
 #ifdef LTC_SHA512
  { "SHA512", "sha512", &sha512_desc },
 #endif
 #ifdef LTC_SHA3
  { "SHA3-224", "sha3-224", &sha3_224_desc },
  { "SHA3-256", "sha3-256", &sha3_256_desc },
  { "SHA3-384", "sha3-384", &sha3_384_desc },
  { "SHA3-512", "sha3-512", &sha3_512_desc },
 #endif
 #ifdef LTC_TIGER
  { "TIGER", "tiger", &tiger_desc },
 #endif
@@ -106,28 +99,18 @@ HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
    const unsigned char *in2, unsigned int in2_len,
    unsigned char *out, unsigned int out_len)
 {
  unsigned char buf[MAX_HASH_LENGTH];
  unsigned long len;
  int r;
-  len = sizeof (buf);
+  len = out_len;
  if (in2)
-    r = hash_memory_multi(id, buf, &len,
+    r = hash_memory_multi(id, out, &len,
-                          in1, (unsigned long)in1_len,
+        in1, (unsigned long)in1_len, in2, (unsigned long)in2_len, NULL, 0);
                          in2, (unsigned long)in2_len, NULL, 0);
  else
-    r = hash_memory(id, in1, in1_len, buf, &len);
+    r = hash_memory(id, in1, in1_len, out, &len);
  if (r != CRYPT_OK)
    return 0;
  len = MIN(len, out_len);
  memcpy(out, buf, len);
  return len;
 }
 void
 HSH_Finalise(void)
 {
 }
--- a/hwclock.c
+++ b/hwclock.c
@@ -1,227 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016-2018
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Tracking of hardware clocks (e.g. RTC, PHC)
  */
 #include "config.h"
 #include "sysincl.h"
 #include "array.h"
 #include "hwclock.h"
 #include "local.h"
 #include "logging.h"
 #include "memory.h"
 #include "regress.h"
 #include "util.h"
 /* Minimum and maximum number of samples per clock */
 #define MIN_SAMPLES 2
 #define MAX_SAMPLES 64
 /* Maximum acceptable frequency offset of the clock */
 #define MAX_FREQ_OFFSET (2.0 / 3.0)
 struct HCL_Instance_Record {
  /* HW and local reference timestamp */
  struct timespec hw_ref;
  struct timespec local_ref;
  /* Samples stored as intervals (uncorrected for frequency error)
     relative to local_ref and hw_ref */
  double *x_data;
  double *y_data;
  /* Minimum, maximum and current number of samples */
  int min_samples;
  int max_samples;
  int n_samples;
  /* Maximum error of the last sample */
  double last_err;
  /* Minimum interval between samples */
  double min_separation;
  /* Flag indicating the offset and frequency values are valid */
  int valid_coefs;
  /* Estimated offset and frequency of HW clock relative to local clock */
  double offset;
  double frequency;
 };
 /* ================================================== */
 static void
 handle_slew(struct timespec *raw, struct timespec *cooked, double dfreq,
            double doffset, LCL_ChangeType change_type, void *anything)
 {
  HCL_Instance clock;
  double delta;
  clock = anything;
  if (clock->n_samples)
    UTI_AdjustTimespec(&clock->local_ref, cooked, &clock->local_ref, &delta, dfreq, doffset);
  if (clock->valid_coefs)
    clock->frequency /= 1.0 - dfreq;
 }
 /* ================================================== */
 HCL_Instance
 HCL_CreateInstance(int min_samples, int max_samples, double min_separation)
 {
  HCL_Instance clock;
  min_samples = CLAMP(MIN_SAMPLES, min_samples, MAX_SAMPLES);
  max_samples = CLAMP(MIN_SAMPLES, max_samples, MAX_SAMPLES);
  max_samples = MAX(min_samples, max_samples);
  clock = MallocNew(struct HCL_Instance_Record);
  clock->x_data = MallocArray(double, max_samples);
  clock->y_data = MallocArray(double, max_samples);
  clock->x_data[max_samples - 1] = 0.0;
  clock->y_data[max_samples - 1] = 0.0;
  clock->min_samples = min_samples;
  clock->max_samples = max_samples;
  clock->n_samples = 0;
  clock->valid_coefs = 0;
  clock->min_separation = min_separation;
  LCL_AddParameterChangeHandler(handle_slew, clock);
  return clock;
 }
 /* ================================================== */
 void HCL_DestroyInstance(HCL_Instance clock)
 {
  LCL_RemoveParameterChangeHandler(handle_slew, clock);
  Free(clock->y_data);
  Free(clock->x_data);
  Free(clock);
 }
 /* ================================================== */
 int
 HCL_NeedsNewSample(HCL_Instance clock, struct timespec *now)
 {
  if (!clock->n_samples ||
      fabs(UTI_DiffTimespecsToDouble(now, &clock->local_ref)) >= clock->min_separation)
    return 1;
  return 0;
 }
 /* ================================================== */
 void
 HCL_AccumulateSample(HCL_Instance clock, struct timespec *hw_ts,
                     struct timespec *local_ts, double err)
 {
  double hw_delta, local_delta, local_freq, raw_freq;
  int i, n_runs, best_start;
  local_freq = 1.0 - LCL_ReadAbsoluteFrequency() / 1.0e6;
  /* Shift old samples */
  if (clock->n_samples) {
    if (clock->n_samples >= clock->max_samples)
      clock->n_samples--;
    hw_delta = UTI_DiffTimespecsToDouble(hw_ts, &clock->hw_ref);
    local_delta = UTI_DiffTimespecsToDouble(local_ts, &clock->local_ref) / local_freq;
    if (hw_delta <= 0.0 || local_delta < clock->min_separation / 2.0) {
      clock->n_samples = 0;
      DEBUG_LOG("HW clock reset interval=%f", local_delta);
    }
    for (i = clock->max_samples - clock->n_samples; i < clock->max_samples; i++) {
      clock->y_data[i - 1] = clock->y_data[i] - hw_delta;
      clock->x_data[i - 1] = clock->x_data[i] - local_delta;
    }
  }
  clock->n_samples++;
  clock->hw_ref = *hw_ts;
  clock->local_ref = *local_ts;
  clock->last_err = err;
  /* Get new coefficients */
  clock->valid_coefs =
    RGR_FindBestRobustRegression(clock->x_data + clock->max_samples - clock->n_samples,
                                 clock->y_data + clock->max_samples - clock->n_samples,
                                 clock->n_samples, 1.0e-10, &clock->offset, &raw_freq,
                                 &n_runs, &best_start);
  if (!clock->valid_coefs) {
    DEBUG_LOG("HW clock needs more samples");
    return;
  }
  clock->frequency = raw_freq / local_freq;
  /* Drop unneeded samples */
  if (clock->n_samples > clock->min_samples)
    clock->n_samples -= MIN(best_start, clock->n_samples - clock->min_samples);
  /* If the fit doesn't cross the error interval of the last sample,
     or the frequency is not sane, drop all samples and start again */
  if (fabs(clock->offset) > err ||
      fabs(clock->frequency - 1.0) > MAX_FREQ_OFFSET) {
    DEBUG_LOG("HW clock reset");
    clock->n_samples = 0;
    clock->valid_coefs = 0;
  }
  DEBUG_LOG("HW clock samples=%d offset=%e freq=%e raw_freq=%e err=%e ref_diff=%e",
            clock->n_samples, clock->offset, clock->frequency - 1.0, raw_freq - 1.0, err,
            UTI_DiffTimespecsToDouble(&clock->hw_ref, &clock->local_ref));
 }
 /* ================================================== */
 int
 HCL_CookTime(HCL_Instance clock, struct timespec *raw, struct timespec *cooked, double *err)
 {
  double offset, elapsed;
  if (!clock->valid_coefs)
    return 0;
  elapsed = UTI_DiffTimespecsToDouble(raw, &clock->hw_ref);
  offset = elapsed / clock->frequency - clock->offset;
  UTI_AddDoubleToTimespec(&clock->local_ref, offset, cooked);
  /* Fow now, just return the error of the last sample */
  if (err)
    *err = clock->last_err;
  return 1;
 }
--- a/hwclock.h
+++ b/hwclock.h
@@ -1,49 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Header for tracking of hardware clocks */
 #ifndef GOT_HWCLOCK_H
 #define GOT_HWCLOCK_H
 typedef struct HCL_Instance_Record *HCL_Instance;
 /* Create a new HW clock instance */
 extern HCL_Instance HCL_CreateInstance(int min_samples, int max_samples,
                                       double min_separation);
 /* Destroy a HW clock instance */
 extern void HCL_DestroyInstance(HCL_Instance clock);
 /* Check if a new sample should be accumulated at this time */
 extern int HCL_NeedsNewSample(HCL_Instance clock, struct timespec *now);
 /* Accumulate a new sample */
 extern void HCL_AccumulateSample(HCL_Instance clock, struct timespec *hw_ts,
                                 struct timespec *local_ts, double err);
 /* Convert raw hardware time to cooked local time */
 extern int HCL_CookTime(HCL_Instance clock, struct timespec *raw, struct timespec *cooked,
                        double *err);
 #endif
--- a/keys.c
+++ b/keys.c
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2012-2016
+ * Copyright (C) Miroslav Lichvar  2012-2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -30,7 +30,6 @@
 #include "sysincl.h"
 #include "array.h"
 #include "keys.h"
 #include "cmdparse.h"
 #include "conf.h"
@@ -39,35 +38,82 @@
 #include "local.h"
 #include "logging.h"
 /* Consider 80 bits as the absolute minimum for a secure key */
 #define MIN_SECURE_KEY_LENGTH 10
 typedef struct {
-  uint32_t id;
+  unsigned long id;
  char *val;
  int len;
  int hash_id;
  int auth_delay;
 } Key;
-static ARR_Instance keys;
+#define MAX_KEYS 256
 static int n_keys;
 static Key keys[MAX_KEYS];
 static int command_key_valid;
 static int command_key_id;
 static int cache_valid;
-static uint32_t cache_key_id;
+static unsigned long cache_key_id;
 static int cache_key_pos;
 /* ================================================== */
-static void
+static int
-free_keys(void)
+generate_key(unsigned long key_id)
 {
-  unsigned int i;
+#ifdef GENERATE_SHA1_KEY
  unsigned char key[20];
  const char *hashname = "SHA1";
 #else
  unsigned char key[16];
  const char *hashname = "MD5";
 #endif
  const char *key_file, *rand_dev = "/dev/urandom";
  FILE *f;
  struct stat st;
  int i;
-  for (i = 0; i < ARR_GetSize(keys); i++)
+  key_file = CNF_GetKeysFile();
    Free(((Key *)ARR_GetElement(keys, i))->val);
-  ARR_SetSize(keys, 0);
+  if (!key_file)
-  cache_valid = 0;
+    return 0;
  f = fopen(rand_dev, "r");
  if (!f || fread(key, sizeof (key), 1, f) != 1) {
    if (f)
      fclose(f);
    LOG_FATAL(LOGF_Keys, "Could not read %s", rand_dev);
    return 0;
  }
  fclose(f);
  f = fopen(key_file, "a");
  if (!f) {
    LOG_FATAL(LOGF_Keys, "Could not open keyfile %s for writing", key_file);
    return 0;
  }
  /* Make sure the keyfile is not world-readable */
  if (stat(key_file, &st) || chmod(key_file, st.st_mode & 0770)) {
    fclose(f);
    LOG_FATAL(LOGF_Keys, "Could not change permissions of keyfile %s", key_file);
    return 0;
  }
  fprintf(f, "\n%lu %s HEX:", key_id, hashname);
  for (i = 0; i < sizeof (key); i++)
    fprintf(f, "%02hhX", key[i]);
  fprintf(f, "\n");
  fclose(f);
  /* Erase the key from stack */
  memset(key, 0, sizeof (key));
  LOG(LOGS_INFO, LOGF_Keys, "Generated key %lu", key_id);
  return 1;
 }
 /* ================================================== */
@@ -75,9 +121,15 @@ free_keys(void)
 void
 KEY_Initialise(void)
 {
-  keys = ARR_CreateInstance(sizeof (Key));
+  n_keys = 0;
  command_key_valid = 0;
  cache_valid = 0;
  KEY_Reload();
  if (CNF_GetGenerateCommandKey() && !KEY_KeyKnown(KEY_GetCommandKey())) {
    if (generate_key(KEY_GetCommandKey()))
      KEY_Reload();
  }
 }
 /* ================================================== */
@@ -85,79 +137,37 @@ KEY_Initialise(void)
 void
 KEY_Finalise(void)
 {
  free_keys();
  ARR_DestroyInstance(keys);
 }
 /* ================================================== */
 static Key *
 get_key(unsigned int index)
 {
  return ((Key *)ARR_GetElements(keys)) + index;
 }
 /* ================================================== */
 static int
-determine_hash_delay(uint32_t key_id)
+determine_hash_delay(unsigned long key_id)
 {
  NTP_Packet pkt;
-  struct timespec before, after;
+  struct timeval before, after;
-  double diff, min_diff;
+  unsigned long usecs, min_usecs=0;
-  int i, nsecs;
+  int i;
  memset(&pkt, 0, sizeof (pkt));
  for (i = 0; i < 10; i++) {
    LCL_ReadRawTime(&before);
-    KEY_GenerateAuth(key_id, (unsigned char *)&pkt, NTP_NORMAL_PACKET_LENGTH,
+    KEY_GenerateAuth(key_id, (unsigned char *)&pkt, NTP_NORMAL_PACKET_SIZE,
        (unsigned char *)&pkt.auth_data, sizeof (pkt.auth_data));
    LCL_ReadRawTime(&after);
-    diff = UTI_DiffTimespecsToDouble(&after, &before);
+    usecs = (after.tv_sec - before.tv_sec) * 1000000 + (after.tv_usec - before.tv_usec);
-    if (i == 0 || min_diff > diff)
+    if (i == 0 || usecs < min_usecs) {
-      min_diff = diff;
+      min_usecs = usecs;
    }
  }
  /* Add on a bit extra to allow for copying, conversions etc */
-  nsecs = 1.0625e9 * min_diff;
+  min_usecs += min_usecs >> 4;
-  DEBUG_LOG("authentication delay for key %"PRIu32": %d nsecs", key_id, nsecs);
+  DEBUG_LOG(LOGF_Keys, "authentication delay for key %lu: %ld useconds", key_id, min_usecs);
-  return nsecs;
+  return min_usecs;
 }
 /* ================================================== */
 /* Decode password encoded in ASCII or HEX */
 static int
 decode_password(char *key)
 {
  int i, j, len = strlen(key);
  char buf[3], *p;
  if (!strncmp(key, "ASCII:", 6)) {
    memmove(key, key + 6, len - 6);
    return len - 6;
  } else if (!strncmp(key, "HEX:", 4)) {
    if ((len - 4) % 2)
      return 0;
    for (i = 0, j = 4; j + 1 < len; i++, j += 2) {
      buf[0] = key[j], buf[1] = key[j + 1], buf[2] = '\0';
      key[i] = strtol(buf, &p, 16);
      if (p != buf + 2)
        return 0;
    }
    return i;
  } else {
    /* assume ASCII */
    return len;
  }
 }
 /* ================================================== */
@@ -185,14 +195,18 @@ compare_keys_by_id(const void *a, const void *b)
 void
 KEY_Reload(void)
 {
-  unsigned int i, line_number;
+  int i, line_number;
  FILE *in;
-  uint32_t key_id;
+  unsigned long key_id;
  char line[2048], *keyval, *key_file;
  const char *hashname;
  Key key;
-  free_keys();
+  for (i=0; i<n_keys; i++) {
    Free(keys[i].val);
  }
  n_keys = 0;
  command_key_valid = 0;
  cache_valid = 0;
  key_file = CNF_GetKeysFile();
  line_number = 0;
@@ -202,7 +216,7 @@ KEY_Reload(void)
  in = fopen(key_file, "r");
  if (!in) {
-    LOG(LOGS_WARN, "Could not open keyfile %s", key_file);
+    LOG(LOGS_WARN, LOGF_Keys, "Could not open keyfile %s", key_file);
    return;
  }
@@ -214,26 +228,26 @@ KEY_Reload(void)
      continue;
    if (!CPS_ParseKey(line, &key_id, &hashname, &keyval)) {
-      LOG(LOGS_WARN, "Could not parse key at line %u in file %s", line_number, key_file);
+      LOG(LOGS_WARN, LOGF_Keys, "Could not parse key at line %d in file %s", line_number, key_file);
      continue;
    }
-    key.hash_id = HSH_GetHashId(hashname);
+    keys[n_keys].hash_id = HSH_GetHashId(hashname);
-    if (key.hash_id < 0) {
+    if (keys[n_keys].hash_id < 0) {
-      LOG(LOGS_WARN, "Unknown hash function in key %"PRIu32, key_id);
+      LOG(LOGS_WARN, LOGF_Keys, "Unknown hash function in key %lu", key_id);
      continue;
    }
-    key.len = decode_password(keyval);
+    keys[n_keys].len = UTI_DecodePasswordFromText(keyval);
-    if (!key.len) {
+    if (!keys[n_keys].len) {
-      LOG(LOGS_WARN, "Could not decode password in key %"PRIu32, key_id);
+      LOG(LOGS_WARN, LOGF_Keys, "Could not decode password in key %lu", key_id);
      continue;
    }
-    key.id = key_id;
+    keys[n_keys].id = key_id;
-    key.val = MallocArray(char, key.len);
+    keys[n_keys].val = MallocArray(char, keys[n_keys].len);
-    memcpy(key.val, keyval, key.len);
+    memcpy(keys[n_keys].val, keyval, keys[n_keys].len);
-    ARR_AppendElement(keys, &key);
+    n_keys++;
  }
  fclose(in);
@@ -241,50 +255,50 @@ KEY_Reload(void)
  /* Sort keys into order.  Note, if there's a duplicate, it is
     arbitrary which one we use later - the user should have been
     more careful! */
-  qsort(ARR_GetElements(keys), ARR_GetSize(keys), sizeof (Key), compare_keys_by_id);
+  qsort((void *) keys, n_keys, sizeof(Key), compare_keys_by_id);
  /* Check for duplicates */
-  for (i = 1; i < ARR_GetSize(keys); i++) {
+  for (i = 1; i < n_keys; i++) {
-    if (get_key(i - 1)->id == get_key(i)->id)
+    if (keys[i - 1].id == keys[i].id) {
-      LOG(LOGS_WARN, "Detected duplicate key %"PRIu32, get_key(i - 1)->id);
+      LOG(LOGS_WARN, LOGF_Keys, "Detected duplicate key %lu", keys[i].id);
    }
  }
  /* Erase any passwords from stack */
  memset(line, 0, sizeof (line));
-  for (i = 0; i < ARR_GetSize(keys); i++)
+  for (i=0; i<n_keys; i++) {
-    get_key(i)->auth_delay = determine_hash_delay(get_key(i)->id);
+    keys[i].auth_delay = determine_hash_delay(keys[i].id);
  }
 }
 /* ================================================== */
 static int
-lookup_key(uint32_t id)
+lookup_key(unsigned long id)
 {
-  Key specimen, *where, *keys_ptr;
+  Key specimen, *where;
  int pos;
  keys_ptr = ARR_GetElements(keys);
  specimen.id = id;
-  where = (Key *)bsearch((void *)&specimen, keys_ptr, ARR_GetSize(keys),
+  where = (Key *) bsearch((void *)&specimen, (void *)keys, n_keys, sizeof(Key), compare_keys_by_id);
                         sizeof (Key), compare_keys_by_id);
  if (!where) {
    return -1;
  } else {
-    pos = where - keys_ptr;
+    pos = where - keys;
    return pos;
  }
 }
 /* ================================================== */
-static Key *
+static int
-get_key_by_id(uint32_t key_id)
+get_key_pos(unsigned long key_id)
 {
  int position;
  if (cache_valid && key_id == cache_key_id)
-    return get_key(cache_key_pos);
+    return cache_key_pos;
  position = lookup_key(key_id);
@@ -292,122 +306,81 @@ get_key_by_id(uint32_t key_id)
    cache_valid = 1;
    cache_key_pos = position;
    cache_key_id = key_id;
    return get_key(position);
  }
-  return NULL;
+  return position;
 }
 /* ================================================== */
 unsigned long
 KEY_GetCommandKey(void)
 {
  if (!command_key_valid) {
    command_key_id = CNF_GetCommandKey();
  }
  return command_key_id;
 }
 /* ================================================== */
 int
-KEY_KeyKnown(uint32_t key_id)
+KEY_KeyKnown(unsigned long key_id)
 {
-  return get_key_by_id(key_id) != NULL;
+  return get_key_pos(key_id) >= 0;
 }
 /* ================================================== */
 int
-KEY_GetAuthDelay(uint32_t key_id)
+KEY_GetAuthDelay(unsigned long key_id)
 {
-  Key *key;
+  int key_pos;
-  key = get_key_by_id(key_id);
+  key_pos = get_key_pos(key_id);
-  if (!key)
+  if (key_pos < 0) {
    return 0;
  }
-  return key->auth_delay;
+  return keys[key_pos].auth_delay;
 }
 /* ================================================== */
 int
-KEY_GetAuthLength(uint32_t key_id)
+KEY_GenerateAuth(unsigned long key_id, const unsigned char *data, int data_len,
 {
  unsigned char buf[MAX_HASH_LENGTH];
  Key *key;
  key = get_key_by_id(key_id);
  if (!key)
    return 0;
  return HSH_Hash(key->hash_id, buf, 0, buf, 0, buf, sizeof (buf));
 }
 /* ================================================== */
 int
 KEY_CheckKeyLength(uint32_t key_id)
 {
  Key *key;
  key = get_key_by_id(key_id);
  if (!key)
    return 0;
  return key->len >= MIN_SECURE_KEY_LENGTH;
 }
 /* ================================================== */
 static int
 generate_ntp_auth(int hash_id, const unsigned char *key, int key_len,
                  const unsigned char *data, int data_len,
    unsigned char *auth, int auth_len)
 {
-  return HSH_Hash(hash_id, key, key_len, data, data_len, auth, auth_len);
+  int key_pos;
 }
-/* ================================================== */
+  key_pos = get_key_pos(key_id);
-static int
+  if (key_pos < 0) {
 check_ntp_auth(int hash_id, const unsigned char *key, int key_len,
               const unsigned char *data, int data_len,
               const unsigned char *auth, int auth_len, int trunc_len)
 {
  unsigned char buf[MAX_HASH_LENGTH];
  int hash_len;
  hash_len = generate_ntp_auth(hash_id, key, key_len, data, data_len, buf, sizeof (buf));
  return MIN(hash_len, trunc_len) == auth_len && !memcmp(buf, auth, auth_len);
 }
 /* ================================================== */
 int
 KEY_GenerateAuth(uint32_t key_id, const unsigned char *data, int data_len,
    unsigned char *auth, int auth_len)
 {
  Key *key;
  key = get_key_by_id(key_id);
  if (!key)
    return 0;
  }
-  return generate_ntp_auth(key->hash_id, (unsigned char *)key->val, key->len,
+  return UTI_GenerateNTPAuth(keys[key_pos].hash_id,
      (unsigned char *)keys[key_pos].val, keys[key_pos].len,
      data, data_len, auth, auth_len);
 }
 /* ================================================== */
 int
-KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
+KEY_CheckAuth(unsigned long key_id, const unsigned char *data, int data_len,
-              const unsigned char *auth, int auth_len, int trunc_len)
+    const unsigned char *auth, int auth_len)
 {
-  Key *key;
+  int key_pos;
-  key = get_key_by_id(key_id);
+  key_pos = get_key_pos(key_id);
-  if (!key)
+  if (key_pos < 0) {
    return 0;
  }
-  return check_ntp_auth(key->hash_id, (unsigned char *)key->val, key->len,
+  return UTI_CheckNTPAuth(keys[key_pos].hash_id,
-                        data, data_len, auth, auth_len, trunc_len);
+      (unsigned char *)keys[key_pos].val, keys[key_pos].len,
      data, data_len, auth, auth_len);
 }
--- a/keys.h
+++ b/keys.h
@@ -27,22 +27,20 @@
 #ifndef GOT_KEYS_H
 #define GOT_KEYS_H
 #include "sysincl.h"
 extern void KEY_Initialise(void);
 extern void KEY_Finalise(void);
 extern void KEY_Reload(void);
-extern int KEY_GetKey(uint32_t key_id, char **key, int *len);
+extern unsigned long KEY_GetCommandKey(void);
 extern int KEY_KeyKnown(uint32_t key_id);
 extern int KEY_GetAuthDelay(uint32_t key_id);
 extern int KEY_GetAuthLength(uint32_t key_id);
 extern int KEY_CheckKeyLength(uint32_t key_id);
-extern int KEY_GenerateAuth(uint32_t key_id, const unsigned char *data,
+extern int KEY_GetKey(unsigned long key_id, char **key, int *len);
 extern int KEY_KeyKnown(unsigned long key_id);
 extern int KEY_GetAuthDelay(unsigned long key_id);
 extern int KEY_GenerateAuth(unsigned long key_id, const unsigned char *data,
    int data_len, unsigned char *auth, int auth_len);
-extern int KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
+extern int KEY_CheckAuth(unsigned long key_id, const unsigned char *data,
-                         const unsigned char *auth, int auth_len, int trunc_len);
+    int data_len, const unsigned char *auth, int auth_len);
 #endif /* GOT_KEYS_H */
--- a/local.c
+++ b/local.c
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011, 2014-2015
+ * Copyright (C) Miroslav Lichvar  2011, 2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -36,7 +36,6 @@
 #include "local.h"
 #include "localp.h"
 #include "memory.h"
 #include "smooth.h"
 #include "util.h"
 #include "logging.h"
@@ -45,9 +44,6 @@
 /* Variable to store the current frequency, in ppm */
 static double current_freq_ppm;
 /* Maximum allowed frequency, in ppm */
 static double max_freq_ppm;
 /* Temperature compensation, in ppm */
 static double temp_comp_ppm;
@@ -60,7 +56,6 @@ static lcl_AccrueOffsetDriver drv_accrue_offset;
 static lcl_ApplyStepOffsetDriver drv_apply_step_offset;
 static lcl_OffsetCorrectionDriver drv_offset_convert;
 static lcl_SetLeapDriver drv_set_leap;
 static lcl_SetSyncStatusDriver drv_set_sync_status;
 /* ================================================== */
@@ -106,47 +101,40 @@ static double max_clock_error;
   under 1s of busy waiting. */
 #define NITERS 100
 #define NSEC_PER_SEC 1000000000
 static void
 calculate_sys_precision(void)
 {
-  struct timespec ts, old_ts;
+  struct timeval tv, old_tv;
-  int iters, diff, best;
+  int dusec, best_dusec;
  int iters;
-  LCL_ReadRawTime(&old_ts);
+  gettimeofday(&old_tv, NULL);
-
+  best_dusec = 1000000; /* Assume we must be better than a second */
  /* Assume we must be better than a second */
  best = NSEC_PER_SEC;
  iters = 0;
  do {
-    LCL_ReadRawTime(&ts);
+    gettimeofday(&tv, NULL);
-
+    dusec = 1000000*(tv.tv_sec - old_tv.tv_sec) + (tv.tv_usec - old_tv.tv_usec);
-    diff = NSEC_PER_SEC * (ts.tv_sec - old_ts.tv_sec) + (ts.tv_nsec - old_ts.tv_nsec);
+    old_tv = tv;
-
+    if (dusec > 0)  {
-    old_ts = ts;
+      if (dusec < best_dusec) {
-    if (diff > 0) {
+        best_dusec = dusec;
-      if (diff < best)
+      }
        best = diff;
      iters++;
    }
  } while (iters < NITERS);
-  assert(best > 0);
+  assert(best_dusec > 0);
-  precision_quantum = 1.0e-9 * best;
+  precision_quantum = best_dusec * 1.0e-6;
  /* Get rounded log2 value of the measured precision */
  precision_log = 0;
-  while (best < 707106781) {
+  while (best_dusec < 707107) {
    precision_log--;
-    best *= 2;
+    best_dusec *= 2;
  }
-  assert(precision_log >= -30);
+  DEBUG_LOG(LOGF_Local, "Clock precision %.9f (%d)", precision_quantum, precision_log);
  DEBUG_LOG("Clock precision %.9f (%d)", precision_quantum, precision_log);
 }
 /* ================================================== */
@@ -172,11 +160,6 @@ LCL_Initialise(void)
  calculate_sys_precision();
  /* This is the maximum allowed frequency offset in ppm, the time must
     never stop or run backwards */
  max_freq_ppm = CNF_GetMaxDrift();
  max_freq_ppm = CLAMP(0.0, max_freq_ppm, 500000.0);
  max_clock_error = CNF_GetMaxClockError() * 1e-6;
 }
@@ -185,13 +168,6 @@ LCL_Initialise(void)
 void
 LCL_Finalise(void)
 {
  while (change_list.next != &change_list)
    LCL_RemoveParameterChangeHandler(change_list.next->handler,
                                     change_list.next->anything);
  while (dispersion_notify_list.next != &dispersion_notify_list)
    LCL_RemoveDispersionNotifyHandler(dispersion_notify_list.next->handler,
                                      dispersion_notify_list.next->anything);
 }
 /* ================================================== */
@@ -271,7 +247,7 @@ void LCL_RemoveParameterChangeHandler(LCL_ParameterChangeHandler handler, void *
  ptr->next->prev = ptr->prev;
  ptr->prev->next = ptr->next;
-  Free(ptr);
+  free(ptr);
 }
 /* ================================================== */
@@ -285,7 +261,7 @@ LCL_IsFirstParameterChangeHandler(LCL_ParameterChangeHandler handler)
 /* ================================================== */
 static void
-invoke_parameter_change_handlers(struct timespec *raw, struct timespec *cooked,
+invoke_parameter_change_handlers(struct timeval *raw, struct timeval *cooked,
                                 double dfreq, double doffset,
                                 LCL_ChangeType change_type)
 {
@@ -348,33 +324,27 @@ void LCL_RemoveDispersionNotifyHandler(LCL_DispersionNotifyHandler handler, void
  ptr->next->prev = ptr->prev;
  ptr->prev->next = ptr->next;
-  Free(ptr);
+  free(ptr);
 }
 /* ================================================== */
 /* At the moment, this is just gettimeofday(), because
   I can't think of a Unix system where it would not be */
 void
 LCL_ReadRawTime(struct timeval *result)
 {
  if (gettimeofday(result, NULL) < 0) {
    LOG_FATAL(LOGF_Local, "gettimeofday() failed");
  }
 }
 /* ================================================== */
 void
-LCL_ReadRawTime(struct timespec *ts)
+LCL_ReadCookedTime(struct timeval *result, double *err)
 {
-#if HAVE_CLOCK_GETTIME
+  struct timeval raw;
  if (clock_gettime(CLOCK_REALTIME, ts) < 0)
    LOG_FATAL("clock_gettime() failed : %s", strerror(errno));
 #else
  struct timeval tv;
  if (gettimeofday(&tv, NULL) < 0)
    LOG_FATAL("gettimeofday() failed : %s", strerror(errno));
  UTI_TimevalToTimespec(&tv, ts);
 #endif
 }
 /* ================================================== */
 void
 LCL_ReadCookedTime(struct timespec *result, double *err)
 {
  struct timespec raw;
  LCL_ReadRawTime(&raw);
  LCL_CookTime(&raw, result, err);
@@ -383,18 +353,18 @@ LCL_ReadCookedTime(struct timespec *result, double *err)
 /* ================================================== */
 void
-LCL_CookTime(struct timespec *raw, struct timespec *cooked, double *err)
+LCL_CookTime(struct timeval *raw, struct timeval *cooked, double *err)
 {
  double correction;
  LCL_GetOffsetCorrection(raw, &correction, err);
-  UTI_AddDoubleToTimespec(raw, correction, cooked);
+  UTI_AddDoubleToTimeval(raw, correction, cooked);
 }
 /* ================================================== */
 void
-LCL_GetOffsetCorrection(struct timespec *raw, double *correction, double *err)
+LCL_GetOffsetCorrection(struct timeval *raw, double *correction, double *err)
 {
  /* Call system specific driver to get correction */
  (*drv_offset_convert)(raw, correction, err);
@@ -419,44 +389,15 @@ LCL_ReadAbsoluteFrequency(void)
 }
 /* ================================================== */
 static double
 clamp_freq(double freq)
 {
  if (freq <= max_freq_ppm && freq >= -max_freq_ppm)
    return freq;
  LOG(LOGS_WARN, "Frequency %.1f ppm exceeds allowed maximum", freq);
  return CLAMP(-max_freq_ppm, freq, max_freq_ppm);
 }
 /* ================================================== */
 static int
 check_offset(struct timespec *now, double offset)
 {
  /* Check if the time will be still sane with accumulated offset */
  if (UTI_IsTimeOffsetSane(now, -offset))
      return 1;
  LOG(LOGS_WARN, "Adjustment of %.1f seconds is invalid", -offset);
  return 0;
 }
 /* ================================================== */
 /* This involves both setting the absolute frequency with the
   system-specific driver, as well as calling all notify handlers */
 void
 LCL_SetAbsoluteFrequency(double afreq_ppm)
 {
-  struct timespec raw, cooked;
+  struct timeval raw, cooked;
  double dfreq;
  afreq_ppm = clamp_freq(afreq_ppm);
  /* Apply temperature compensation */
  if (temp_comp_ppm != 0.0) {
    afreq_ppm = afreq_ppm * (1.0 - 1.0e-6 * temp_comp_ppm) - temp_comp_ppm;
@@ -483,7 +424,7 @@ LCL_SetAbsoluteFrequency(double afreq_ppm)
 void
 LCL_AccumulateDeltaFrequency(double dfreq)
 {
-  struct timespec raw, cooked;
+  struct timeval raw, cooked;
  double old_freq_ppm;
  old_freq_ppm = current_freq_ppm;
@@ -494,8 +435,6 @@ LCL_AccumulateDeltaFrequency(double dfreq)
  current_freq_ppm += dfreq * (1.0e6 - current_freq_ppm);
  current_freq_ppm = clamp_freq(current_freq_ppm);
  /* Call the system-specific driver for setting the frequency */
  current_freq_ppm = (*drv_set_freq)(current_freq_ppm);
  dfreq = (current_freq_ppm - old_freq_ppm) / (1.0e6 - old_freq_ppm);
@@ -512,7 +451,7 @@ LCL_AccumulateDeltaFrequency(double dfreq)
 void
 LCL_AccumulateOffset(double offset, double corr_rate)
 {
-  struct timespec raw, cooked;
+  struct timeval raw, cooked;
  /* In this case, the cooked time to be passed to the notify clients
     has to be the cooked time BEFORE the change was made */
@@ -520,9 +459,6 @@ LCL_AccumulateOffset(double offset, double corr_rate)
  LCL_ReadRawTime(&raw);
  LCL_CookTime(&raw, &cooked, NULL);
  if (!check_offset(&cooked, offset))
      return;
  (*drv_accrue_offset)(offset, corr_rate);
  /* Dispatch to all handlers */
@@ -531,10 +467,10 @@ LCL_AccumulateOffset(double offset, double corr_rate)
 /* ================================================== */
-int
+void
 LCL_ApplyStepOffset(double offset)
 {
-  struct timespec raw, cooked;
+  struct timeval raw, cooked;
  /* In this case, the cooked time to be passed to the notify clients
     has to be the cooked time BEFORE the change was made */
@@ -542,27 +478,16 @@ LCL_ApplyStepOffset(double offset)
  LCL_ReadRawTime(&raw);
  LCL_CookTime(&raw, &cooked, NULL);
-  if (!check_offset(&raw, offset))
+  (*drv_apply_step_offset)(offset);
      return 0;
  if (!(*drv_apply_step_offset)(offset)) {
    LOG(LOGS_ERR, "Could not step system clock");
    return 0;
  }
  /* Reset smoothing on all clock steps */
  SMT_Reset(&cooked);
  /* Dispatch to all handlers */
  invoke_parameter_change_handlers(&raw, &cooked, 0.0, offset, LCL_ChangeStep);
  return 1;
 }
 /* ================================================== */
 void
-LCL_NotifyExternalTimeStep(struct timespec *raw, struct timespec *cooked,
+LCL_NotifyExternalTimeStep(struct timeval *raw, struct timeval *cooked,
    double offset, double dispersion)
 {
  /* Dispatch to all handlers */
@@ -573,27 +498,10 @@ LCL_NotifyExternalTimeStep(struct timespec *raw, struct timespec *cooked,
 /* ================================================== */
 void
 LCL_NotifyLeap(int leap)
 {
  struct timespec raw, cooked;
  LCL_ReadRawTime(&raw);
  LCL_CookTime(&raw, &cooked, NULL);
  /* Smooth the leap second out */
  SMT_Leap(&cooked, leap);
  /* Dispatch to all handlers as if the clock was stepped */
  invoke_parameter_change_handlers(&raw, &cooked, 0.0, -leap, LCL_ChangeStep);
 }
 /* ================================================== */
 void
 LCL_AccumulateFrequencyAndOffset(double dfreq, double doffset, double corr_rate)
 {
-  struct timespec raw, cooked;
+  struct timeval raw, cooked;
  double old_freq_ppm;
  LCL_ReadRawTime(&raw);
@@ -601,9 +509,6 @@ LCL_AccumulateFrequencyAndOffset(double dfreq, double doffset, double corr_rate)
     to the change we are about to make */
  LCL_CookTime(&raw, &cooked, NULL);
  if (!check_offset(&cooked, doffset))
      return;
  old_freq_ppm = current_freq_ppm;
  /* Work out new absolute frequency.  Note that absolute frequencies
@@ -611,9 +516,7 @@ LCL_AccumulateFrequencyAndOffset(double dfreq, double doffset, double corr_rate)
   terms of the gradient of the (offset) v (local time) function. */
  current_freq_ppm += dfreq * (1.0e6 - current_freq_ppm);
-  current_freq_ppm = clamp_freq(current_freq_ppm);
+  DEBUG_LOG(LOGF_Local, "old_freq=%.3fppm new_freq=%.3fppm offset=%.6fsec",
  DEBUG_LOG("old_freq=%.3fppm new_freq=%.3fppm offset=%.6fsec",
      old_freq_ppm, current_freq_ppm, doffset);
  /* Call the system-specific driver for setting the frequency */
@@ -647,8 +550,7 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
                          lcl_AccrueOffsetDriver accrue_offset,
                          lcl_ApplyStepOffsetDriver apply_step_offset,
                          lcl_OffsetCorrectionDriver offset_convert,
-                          lcl_SetLeapDriver set_leap,
+                          lcl_SetLeapDriver set_leap)
                          lcl_SetSyncStatusDriver set_sync_status)
 {
  drv_read_freq = read_freq;
  drv_set_freq = set_freq;
@@ -656,11 +558,10 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
  drv_apply_step_offset = apply_step_offset;
  drv_offset_convert = offset_convert;
  drv_set_leap = set_leap;
  drv_set_sync_status = set_sync_status;
  current_freq_ppm = (*drv_read_freq)();
-  DEBUG_LOG("Local freq=%.3fppm", current_freq_ppm);
+  DEBUG_LOG(LOGF_Local, "Local freq=%.3fppm", current_freq_ppm);
 }
 /* ================================================== */
@@ -670,40 +571,28 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
 int
 LCL_MakeStep(void)
 {
-  struct timespec raw;
+  struct timeval raw;
  double correction;
  LCL_ReadRawTime(&raw);
  LCL_GetOffsetCorrection(&raw, &correction, NULL);
  if (!check_offset(&raw, -correction))
      return 0;
  /* Cancel remaining slew and make the step */
  LCL_AccumulateOffset(correction, 0.0);
-  if (!LCL_ApplyStepOffset(-correction))
+  LCL_ApplyStepOffset(-correction);
    return 0;
-  LOG(LOGS_WARN, "System clock was stepped by %.6f seconds", correction);
+  LOG(LOGS_WARN, LOGF_Local, "System clock was stepped by %.6f seconds", correction);
  return 1;
 }
 /* ================================================== */
 int
 LCL_CanSystemLeap(void)
 {
  return drv_set_leap ? 1 : 0;
 }
 /* ================================================== */
 void
-LCL_SetSystemLeap(int leap, int tai_offset)
+LCL_SetLeap(int leap)
 {
  if (drv_set_leap) {
-    (drv_set_leap)(leap, tai_offset);
+    (drv_set_leap)(leap);
  }
 }
@@ -736,13 +625,3 @@ LCL_SetTempComp(double comp)
 }
 /* ================================================== */
 void
 LCL_SetSyncStatus(int synchronised, double est_error, double max_error)
 {
  if (drv_set_sync_status) {
    (drv_set_sync_status)(synchronised, est_error, max_error);
  }
 }
 /* ================================================== */
--- a/local.h
+++ b/local.h
@@ -31,8 +31,9 @@
 #include "sysincl.h"
-/* Read the system clock */
+/* Read the system clock.  This is analogous to gettimeofday(),
-extern void LCL_ReadRawTime(struct timespec *ts);
+   but with the timezone information ignored */
 extern void LCL_ReadRawTime(struct timeval *);
 /* Read the system clock, corrected according to all accumulated
   drifts and uncompensated offsets.
@@ -43,15 +44,15 @@ extern void LCL_ReadRawTime(struct timespec *ts);
   adjtime()-like interface to correct offsets, and to adjust the
   frequency), we must correct the raw time to get this value */
-extern void LCL_ReadCookedTime(struct timespec *ts, double *err);
+extern void LCL_ReadCookedTime(struct timeval *t, double *err);
 /* Convert raw time to cooked. */
-extern void LCL_CookTime(struct timespec *raw, struct timespec *cooked, double *err);
+extern void LCL_CookTime(struct timeval *raw, struct timeval *cooked, double *err);
 /* Read the current offset between the system clock and true time
   (i.e. 'cooked' - 'raw') (in seconds). */
-extern void LCL_GetOffsetCorrection(struct timespec *raw, double *correction, double *err);
+extern void LCL_GetOffsetCorrection(struct timeval *raw, double *correction, double *err);
 /* Type of routines that may be invoked as callbacks when there is a
   change to the frequency or offset.
@@ -78,7 +79,7 @@ typedef enum {
 } LCL_ChangeType;
 typedef void (*LCL_ParameterChangeHandler)
-     (struct timespec *raw, struct timespec *cooked,
+     (struct timeval *raw, struct timeval *cooked,
      double dfreq,
      double doffset,
      LCL_ChangeType change_type,
@@ -158,17 +159,13 @@ extern void LCL_AccumulateOffset(double offset, double corr_rate);
   the system clock is fast on true time, i.e. it needs to be stepped
   backwards. (Same convention as for AccumulateOffset routine). */
-extern int LCL_ApplyStepOffset(double offset);
+extern void LCL_ApplyStepOffset(double offset);
 /* Routine to invoke notify handlers on an unexpected time jump
   in system clock */
-extern void LCL_NotifyExternalTimeStep(struct timespec *raw, struct timespec *cooked,
+extern void LCL_NotifyExternalTimeStep(struct timeval *raw, struct timeval *cooked,
    double offset, double dispersion);
 /* Routine to invoke notify handlers on leap second when the system clock
   doesn't correct itself */
 extern void LCL_NotifyLeap(int leap);
 /* Perform the combination of modifying the frequency and applying
   a slew, in one easy step */
 extern void LCL_AccumulateFrequencyAndOffset(double dfreq, double doffset, double corr_rate);
@@ -197,15 +194,10 @@ extern void LCL_Finalise(void);
   to a timezone problem. */
 extern int LCL_MakeStep(void);
-/* Check if the system driver supports leap seconds, i.e. LCL_SetSystemLeap
+/* Routine to schedule a leap second. Leap second will be inserted
-   does something */
+   at the end of the day if argument is positive, deleted if negative,
-extern int LCL_CanSystemLeap(void);
+   and zero cancels scheduled leap second. */
-
+extern void LCL_SetLeap(int leap);
 /* Routine to set the system clock to correct itself for a leap second and also
   set its TAI-UTC offset.  If supported, leap second will be inserted at the
   end of the day if the argument is positive, deleted if negative, and zero
   resets the setting. */
 extern void LCL_SetSystemLeap(int leap, int tai_offset);
 /* Routine to set a frequency correction (in ppm) that should be applied
   to local clock to compensate for temperature changes.  A positive
@@ -214,8 +206,4 @@ extern void LCL_SetSystemLeap(int leap, int tai_offset);
   due to clamping or rounding). */
 extern double LCL_SetTempComp(double comp);
 /* Routine to update the synchronisation status in the kernel to allow other
   applications to know if the system clock is synchronised and error bounds */
 extern void LCL_SetSyncStatus(int synchronised, double est_error, double max_error);
 #endif /* GOT_LOCAL_H */
--- a/localp.h
+++ b/localp.h
@@ -47,18 +47,15 @@ typedef void (*lcl_AccrueOffsetDriver)(double offset, double corr_rate);
 /* System driver to apply a step offset. A positive argument means step
   the clock forwards. */
-typedef int (*lcl_ApplyStepOffsetDriver)(double offset);
+typedef void (*lcl_ApplyStepOffsetDriver)(double offset);
 /* System driver to convert a raw time to an adjusted (cooked) time.
   The number of seconds returned in 'corr' have to be added to the
   raw time to get the corrected time */
-typedef void (*lcl_OffsetCorrectionDriver)(struct timespec *raw, double *corr, double *err);
+typedef void (*lcl_OffsetCorrectionDriver)(struct timeval *raw, double *corr, double *err);
-/* System driver to schedule leap seconds and set TAI-UTC offset */
+/* System driver to schedule leap second */
-typedef void (*lcl_SetLeapDriver)(int leap, int tai_offset);
+typedef void (*lcl_SetLeapDriver)(int leap);
 /* System driver to set the synchronisation status */
 typedef void (*lcl_SetSyncStatusDriver)(int synchronised, double est_error, double max_error);
 extern void lcl_InvokeDispersionNotifyHandlers(double dispersion);
@@ -68,7 +65,6 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
                          lcl_AccrueOffsetDriver accrue_offset,
                          lcl_ApplyStepOffsetDriver apply_step_offset,
                          lcl_OffsetCorrectionDriver offset_convert,
-                          lcl_SetLeapDriver set_leap,
+                          lcl_SetLeapDriver set_leap);
                          lcl_SetSyncStatusDriver set_sync_status);
 #endif /* GOT_LOCALP_H */
--- a/logging.c
+++ b/logging.c
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2014, 2018
+ * Copyright (C) Miroslav Lichvar  2011-2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -31,6 +31,7 @@
 #include "conf.h"
 #include "logging.h"
 #include "mkdirpp.h"
 #include "util.h"
 /* This is used by DEBUG_LOG macro */
@@ -40,7 +41,6 @@ int log_debug_enabled = 0;
 /* Flag indicating we have initialised */
 static int initialised = 0;
 static FILE *file_log;
 static int system_log = 0;
 static int parent_fd = 0;
@@ -49,6 +49,10 @@ static int parent_fd = 0;
 #define DEBUG_LEVEL_PRINT_DEBUG 2
 static int debug_level = 0;
 #ifdef WINNT
 static FILE *logfile;
 #endif
 struct LogFile {
  const char *name;
  const char *banner;
@@ -70,7 +74,10 @@ void
 LOG_Initialise(void)
 {
  initialised = 1;
-  file_log = stderr;
+
 #ifdef WINNT
  logfile = fopen("./chronyd.err", "a");
 #endif
 }
 /* ================================================== */
@@ -79,11 +86,15 @@ LOG_Initialise(void)
 void
 LOG_Finalise(void)
 {
-  if (system_log)
+#ifdef WINNT
  if (logfile) {
    fclose(logfile);
  }
 #else
  if (system_log) {
    closelog();
-
+  }
-  if (file_log)
+#endif
    fclose(file_log);
  LOG_CycleLogFiles();
@@ -94,6 +105,11 @@ LOG_Finalise(void)
 static void log_message(int fatal, LOG_Severity severity, const char *message)
 {
 #ifdef WINNT
  if (logfile) {
    fprintf(logfile, fatal ? "Fatal error : %s\n" : "%s\n", message);
  }
 #else
  if (system_log) {
    int priority;
    switch (severity) {
@@ -116,37 +132,35 @@ static void log_message(int fatal, LOG_Severity severity, const char *message)
        assert(0);
    }
    syslog(priority, fatal ? "Fatal error : %s" : "%s", message);
-  } else if (file_log) {
+  } else {
-    fprintf(file_log, fatal ? "Fatal error : %s\n" : "%s\n", message);
+    fprintf(stderr, fatal ? "Fatal error : %s\n" : "%s\n", message);
  }
 #endif
 }
 /* ================================================== */
-void LOG_Message(LOG_Severity severity,
+void LOG_Message(LOG_Severity severity, LOG_Facility facility,
-#if DEBUG > 0
+                 int line_number, const char *filename,
-                 int line_number, const char *filename, const char *function_name,
+                 const char *function_name, const char *format, ...)
 #endif
                 const char *format, ...)
 {
  char buf[2048];
  va_list other_args;
  time_t t;
-  struct tm *tm;
+  struct tm stm;
-  if (!system_log && file_log) {
+#ifdef WINNT
 #else
  if (!system_log) {
    /* Don't clutter up syslog with timestamps and internal debugging info */
    time(&t);
-    tm = gmtime(&t);
+    stm = *gmtime(&t);
-    if (tm) {
+    strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%SZ", &stm);
-      strftime(buf, sizeof (buf), "%Y-%m-%dT%H:%M:%SZ", tm);
+    fprintf(stderr, "%s ", buf);
      fprintf(file_log, "%s ", buf);
    }
 #if DEBUG > 0
    if (debug_level >= DEBUG_LEVEL_PRINT_FUNCTION)
-      fprintf(file_log, "%s:%d:(%s) ", filename, line_number, function_name);
+      fprintf(stderr, "%s:%d:(%s) ", filename, line_number, function_name);
 #endif
  }
 #endif
  va_start(other_args, format);
  vsnprintf(buf, sizeof(buf), format, other_args);
@@ -162,54 +176,33 @@ void LOG_Message(LOG_Severity severity,
    case LOGS_FATAL:
      log_message(1, severity, buf);
-      /* Send the message also to the foreground process if it is
+      /* With syslog, send the message also to the grandparent
-         still running, or stderr if it is still open */
+         process or write it to stderr if not detached */
      if (system_log) {
        if (parent_fd > 0) {
          if (write(parent_fd, buf, strlen(buf) + 1) < 0)
            ; /* Not much we can do here */
-      } else if (system_log && parent_fd == 0) {
+        } else if (parent_fd == 0) {
          system_log = 0;
          log_message(1, severity, buf);
        }
-      exit(1);
+      }
      break;
    default:
      assert(0);
  }
 }
 /* ================================================== */
 void
 LOG_OpenFileLog(const char *log_file)
 {
  FILE *f;
  if (log_file) {
    f = fopen(log_file, "a");
    if (!f)
      LOG_FATAL("Could not open log file %s", log_file);
  } else {
    f = stderr;
  }
  /* Enable line buffering */
  setvbuf(f, NULL, _IOLBF, BUFSIZ);
  if (file_log && file_log != stderr)
    fclose(file_log);
  file_log = f;
 }
 /* ================================================== */
 void
 LOG_OpenSystemLog(void)
 {
 #ifdef WINNT
 #else
  system_log = 1;
  openlog("chronyd", LOG_PID, LOG_DAEMON);
 #endif
 }
 /* ================================================== */
@@ -218,6 +211,8 @@ void LOG_SetDebugLevel(int level)
 {
  debug_level = level;
  if (level >= DEBUG_LEVEL_PRINT_DEBUG) {
    if (!DEBUG)
      LOG(LOGS_WARN, LOGF_Logging, "Not compiled with full debugging support");
    log_debug_enabled = 1;
  }
 }
@@ -228,8 +223,6 @@ void
 LOG_SetParentFd(int fd)
 {
  parent_fd = fd;
  if (file_log == stderr)
    file_log = NULL;
 }
 /* ================================================== */
@@ -269,18 +262,12 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
    return;
  if (!logfiles[id].file) {
-    char filename[512], *logdir = CNF_GetLogDir();
+    char filename[512];
    if (logdir[0] == '\0') {
      LOG(LOGS_WARN, "logdir not specified");
      logfiles[id].name = NULL;
      return;
    }
    if (snprintf(filename, sizeof(filename), "%s/%s.log",
-                 logdir, logfiles[id].name) >= sizeof (filename) ||
+          CNF_GetLogDir(), logfiles[id].name) >= sizeof(filename) ||
        !(logfiles[id].file = fopen(filename, "a"))) {
-      LOG(LOGS_WARN, "Could not open log file %s", filename);
+      LOG(LOGS_WARN, LOGF_Refclock, "Couldn't open logfile %s for update", filename);
      logfiles[id].name = NULL;
      return;
    }
@@ -315,6 +302,20 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
 /* ================================================== */
 void
 LOG_CreateLogFileDir(void)
 {
  const char *logdir;
  logdir = CNF_GetLogDir();
  if (!mkdir_and_parents(logdir)) {
    LOG(LOGS_ERR, LOGF_Logging, "Could not create directory %s", logdir);
  }
 }
 /* ================================================== */
 void
 LOG_CycleLogFiles(void)
 {
--- a/logging.h
+++ b/logging.h
@@ -3,7 +3,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2002
- * Copyright (C) Miroslav Lichvar  2013-2015
+ * Copyright (C) Miroslav Lichvar  2013-2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -45,28 +45,18 @@ extern int log_debug_enabled;
 #define FORMAT_ATTRIBUTE_PRINTF(str, first)
 #endif
-#if DEBUG > 0
+#define DEBUG_LOG(facility, ...) \
 #define LOG_MESSAGE(severity, ...) \
  LOG_Message(severity, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__)
 #else
 #define LOG_MESSAGE(severity, ...) \
  LOG_Message(severity, __VA_ARGS__)
 #endif
 #define DEBUG_LOG(...) \
  do { \
    if (DEBUG && log_debug_enabled) \
-      LOG_MESSAGE(LOGS_DEBUG, __VA_ARGS__); \
+      LOG_Message(LOGS_DEBUG, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__); \
  } while (0)
-
+#define LOG(severity, facility, ...) LOG_Message(severity, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__)
-#define LOG_FATAL(...) \
+#define LOG_FATAL(facility, ...) \
  do { \
-    LOG_MESSAGE(LOGS_FATAL, __VA_ARGS__); \
+    LOG_Message(LOGS_FATAL, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__); \
    exit(1); \
  } while (0)
 #define LOG(severity, ...) LOG_MESSAGE(severity, __VA_ARGS__)
 /* Definition of severity */
 typedef enum {
  LOGS_INFO,
@@ -76,6 +66,42 @@ typedef enum {
  LOGS_DEBUG
 } LOG_Severity;
 /* Definition of facility.  Each message is tagged with who generated
   it, so that the user can customise what level of reporting he gets
   for each area of the software */
 typedef enum {
  LOGF_Reference,
  LOGF_NtpIO,
  LOGF_NtpCore,
  LOGF_NtpSources,
  LOGF_Scheduler,
  LOGF_SourceStats,
  LOGF_Sources,
  LOGF_Local,
  LOGF_Util,
  LOGF_Main,
  LOGF_ClientLog,
  LOGF_Configure,
  LOGF_CmdMon,
  LOGF_Acquire,
  LOGF_Manual,
  LOGF_Keys,
  LOGF_Logging,
  LOGF_Nameserv,
  LOGF_Rtc,
  LOGF_Regress,
  LOGF_Sys,
  LOGF_SysGeneric,
  LOGF_SysLinux,
  LOGF_SysNetBSD,
  LOGF_SysSolaris,
  LOGF_SysSunOS,
  LOGF_SysWinnt,
  LOGF_TempComp,
  LOGF_RtcLinux,
  LOGF_Refclock
 } LOG_Facility;
 /* Init function */
 extern void LOG_Initialise(void);
@@ -83,14 +109,10 @@ extern void LOG_Initialise(void);
 extern void LOG_Finalise(void);
 /* Line logging function */
-#if DEBUG > 0
+FORMAT_ATTRIBUTE_PRINTF(6, 7)
-FORMAT_ATTRIBUTE_PRINTF(5, 6)
+extern void LOG_Message(LOG_Severity severity, LOG_Facility facility,
-extern void LOG_Message(LOG_Severity severity, int line_number, const char *filename,
+                        int line_number, const char *filename,
                        const char *function_name, const char *format, ...);
 #else
 FORMAT_ATTRIBUTE_PRINTF(2, 3)
 extern void LOG_Message(LOG_Severity severity, const char *format, ...);
 #endif
 /* Set debug level:
   0, 1 - only non-debug messages are logged
@@ -99,13 +121,10 @@ extern void LOG_Message(LOG_Severity severity, const char *format, ...);
   */
 extern void LOG_SetDebugLevel(int level);
 /* Log messages to a file instead of stderr, or stderr again if NULL */
 extern void LOG_OpenFileLog(const char *log_file);
 /* Log messages to syslog instead of stderr */
 extern void LOG_OpenSystemLog(void);
-/* Stop using stderr and send fatal message to the foreground process */
+/* Send fatal message also to the foreground process */
 extern void LOG_SetParentFd(int fd);
 /* Close the pipe to the foreground process so it can exit */
@@ -120,6 +139,7 @@ extern LOG_FileID LOG_FileOpen(const char *name, const char *banner);
 FORMAT_ATTRIBUTE_PRINTF(2, 3)
 extern void LOG_FileWrite(LOG_FileID id, const char *format, ...);
 extern void LOG_CreateLogFileDir(void);
 extern void LOG_CycleLogFiles(void);
 #endif /* GOT_LOGGING_H */
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
 * Copyright (C) John G. Hasler  2009
- * Copyright (C) Miroslav Lichvar  2012-2018
+ * Copyright (C) Miroslav Lichvar  2012-2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -35,7 +35,6 @@
 #include "local.h"
 #include "sys.h"
 #include "ntp_io.h"
 #include "ntp_signd.h"
 #include "ntp_sources.h"
 #include "ntp_core.h"
 #include "sources.h"
@@ -49,11 +48,9 @@
 #include "rtc.h"
 #include "refclock.h"
 #include "clientlog.h"
 #include "broadcast.h"
 #include "nameserv.h"
 #include "privops.h"
 #include "smooth.h"
 #include "tempcomp.h"
 #include "util.h"
 /* ================================================== */
@@ -70,26 +67,10 @@ static REF_Mode ref_mode = REF_ModeNormal;
 /* ================================================== */
 static void
 do_platform_checks(void)
 {
  /* Require at least 32-bit integers, two's complement representation and
     the usual implementation of conversion of unsigned integers */
  assert(sizeof (int) >= 4);
  assert(-1 == ~0);
  assert((int32_t)4294967295U == (int32_t)-1);
 }
 /* ================================================== */
 static void
 delete_pidfile(void)
 {
  const char *pidfile = CNF_GetPidFile();
  if (!pidfile[0])
    return;
  /* Don't care if this fails, there's not a lot we can do */
  unlink(pidfile);
 }
@@ -101,37 +82,30 @@ MAI_CleanupAndExit(void)
 {
  if (!initialised) exit(exit_status);
-  if (CNF_GetDumpDir()[0] != '\0') {
+  if (CNF_GetDumpOnExit()) {
    SRC_DumpSources();
  }
  /* Don't update clock when removing sources */
  REF_SetMode(REF_ModeIgnore);
  SMT_Finalise();
  TMC_Finalise();
  MNL_Finalise();
  CLG_Finalise();
  NSD_Finalise();
  NSR_Finalise();
  SST_Finalise();
  NCR_Finalise();
-  NIO_Finalise();
+  BRD_Finalise();
-  CAM_Finalise();
+  SST_Finalise();
  REF_Finalise();
  KEY_Finalise();
  RCL_Finalise();
  SRC_Finalise();
  REF_Finalise();
  RTC_Finalise();
  CAM_Finalise();
  NIO_Finalise();
  SYS_Finalise();
  SCH_Finalise();
  LCL_Finalise();
  PRV_Finalise();
  delete_pidfile();
  CNF_Finalise();
  HSH_Finalise();
  LOG_Finalise();
  exit(exit_status);
@@ -148,16 +122,6 @@ signal_cleanup(int x)
 /* ================================================== */
 static void
 quit_timeout(void *arg)
 {
  /* Return with non-zero status if the clock is not synchronised */
  exit_status = REF_GetOurStratum() >= NTP_MAX_STRATUM;
  SCH_QuitProgram();
 }
 /* ================================================== */
 static void
 ntp_source_resolving_end(void)
 {
@@ -171,7 +135,6 @@ ntp_source_resolving_end(void)
    SRC_ReloadSources();
  }
  SRC_RemoveDumpFiles();
  RTC_StartMeasurements();
  RCL_StartRefclocks();
  NSR_StartSources();
@@ -245,67 +208,84 @@ post_init_rtc_hook(void *anything)
 }
 /* ================================================== */
 /* Return 1 if the process exists on the system. */
-static void
+static int
-check_pidfile(void)
+does_process_exist(int pid)
 {
  int status;
  status = getsid(pid);
  if (status >= 0) {
    return 1;
  } else {
    return 0;
  }
 }
 /* ================================================== */
 static int
 maybe_another_chronyd_running(int *other_pid)
 {
  const char *pidfile = CNF_GetPidFile();
  FILE *in;
  int pid, count;
  *other_pid = 0;
  in = fopen(pidfile, "r");
-  if (!in)
+  if (!in) return 0;
    return;
  count = fscanf(in, "%d", &pid);
  fclose(in);
-  if (count != 1)
+  if (count != 1) return 0;
    return;
-  if (getsid(pid) < 0)
+  *other_pid = pid;
-    return;
+  return does_process_exist(pid);
  LOG_FATAL("Another chronyd may already be running (pid=%d), check %s",
            pid, pidfile);
 }
 /* ================================================== */
 static void
-write_pidfile(void)
+write_lockfile(void)
 {
  const char *pidfile = CNF_GetPidFile();
  FILE *out;
-  if (!pidfile[0])
+  out = fopen(pidfile, "w");
-    return;
+  if (!out) {
-
+    LOG_FATAL(LOGF_Main, "could not open lockfile %s for writing", pidfile);
-  out = UTI_OpenFile(NULL, pidfile, NULL, 'W', 0644);
+  } else {
-  fprintf(out, "%d\n", (int)getpid());
+    fprintf(out, "%d\n", getpid());
    fclose(out);
  }
 }
 /* ================================================== */
 #define DEV_NULL "/dev/null"
 static void
 go_daemon(void)
 {
 #ifdef WINNT
 #else
  int pid, fd, pipefd[2];
  /* Create pipe which will the daemon use to notify the grandparent
     when it's initialised or send an error message */
  if (pipe(pipefd)) {
-    LOG_FATAL("pipe() failed : %s", strerror(errno));
+    LOG_FATAL(LOGF_Logging, "Could not detach, pipe failed : %s", strerror(errno));
  }
  /* Does this preserve existing signal handlers? */
  pid = fork();
  if (pid < 0) {
-    LOG_FATAL("fork() failed : %s", strerror(errno));
+    LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno));
  } else if (pid > 0) {
    /* In the 'grandparent' */
    char message[1024];
@@ -316,8 +296,7 @@ go_daemon(void)
    if (r) {
      if (r > 0) {
        /* Print the error message from the child */
-        message[sizeof (message) - 1] = '\0';
+        fprintf(stderr, "%.1024s\n", message);
        fprintf(stderr, "%s\n", message);
      }
      exit(1);
    } else
@@ -331,7 +310,7 @@ go_daemon(void)
    pid = fork();
    if (pid < 0) {
-      LOG_FATAL("fork() failed : %s", strerror(errno));
+      LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno));
    } else if (pid > 0) {
      exit(0); /* In the 'parent' */
    } else {
@@ -339,7 +318,7 @@ go_daemon(void)
      /* Change current directory to / */
      if (chdir("/") < 0) {
-        LOG_FATAL("chdir() failed : %s", strerror(errno));
+        LOG_FATAL(LOGF_Logging, "Could not chdir to / : %s", strerror(errno));
      }
      /* Don't keep stdin/out/err from before. But don't close
@@ -350,44 +329,10 @@ go_daemon(void)
      }
      LOG_SetParentFd(pipefd[1]);
      /* Open /dev/null as new stdin/out/err */
      errno = 0;
      if (open(DEV_NULL, O_RDONLY) != STDIN_FILENO ||
          open(DEV_NULL, O_WRONLY) != STDOUT_FILENO ||
          open(DEV_NULL, O_RDWR) != STDERR_FILENO)
        LOG_FATAL("Could not open %s : %s", DEV_NULL, strerror(errno));
    }
  }
 }
-/* ================================================== */
+#endif
 static void
 print_help(const char *progname)
 {
      printf("Usage: %s [-4|-6] [-n|-d] [-q|-Q] [-r] [-R] [-s] [-t TIMEOUT] [-f FILE|COMMAND...]\n",
             progname);
 }
 /* ================================================== */
 static void
 print_version(void)
 {
  printf("chronyd (chrony) version %s (%s)\n", CHRONY_VERSION, CHRONYD_FEATURES);
 }
 /* ================================================== */
 static int
 parse_int_arg(const char *arg)
 {
  int i;
  if (sscanf(arg, "%d", &i) != 1)
    LOG_FATAL("Invalid argument %s", arg);
  return i;
 }
 /* ================================================== */
@@ -396,164 +341,127 @@ int main
 (int argc, char **argv)
 {
  const char *conf_file = DEFAULT_CONF_FILE;
-  const char *progname = argv[0];
+  char *user = NULL;
-  char *user = NULL, *log_file = NULL;
+  int debug = 0, nofork = 0, address_family = IPADDR_UNSPEC;
-  struct passwd *pw;
+  int do_init_rtc = 0, restarted = 0;
-  int opt, debug = 0, nofork = 0, address_family = IPADDR_UNSPEC;
+  int other_pid;
-  int do_init_rtc = 0, restarted = 0, client_only = 0, timeout = 0;
+  int lock_memory = 0, sched_priority = 0;
-  int scfilter_level = 0, lock_memory = 0, sched_priority = 0;
+  int system_log = 1;
  int clock_control = 1, system_log = 1;
  int config_args = 0;
  do_platform_checks();
  LOG_Initialise();
-  /* Parse (undocumented) long command-line options */
+  /* Parse command line options */
-  for (optind = 1; optind < argc; optind++) {
+  while (++argv, (--argc)>0) {
    if (!strcmp("--help", argv[optind])) {
      print_help(progname);
      return 0;
    } else if (!strcmp("--version", argv[optind])) {
      print_version();
      return 0;
    }
  }
-  optind = 1;
+    if (!strcmp("-f", *argv)) {
-
+      ++argv, --argc;
-  /* Parse short command-line options */
+      conf_file = *argv;
-  while ((opt = getopt(argc, argv, "46df:F:hl:mnP:qQrRst:u:vx")) != -1) {
+    } else if (!strcmp("-P", *argv)) {
-    switch (opt) {
+      ++argv, --argc;
-      case '4':
+      if (argc == 0 || sscanf(*argv, "%d", &sched_priority) != 1) {
-      case '6':
+        LOG_FATAL(LOGF_Main, "Bad scheduler priority");
-        address_family = opt == '4' ? IPADDR_INET4 : IPADDR_INET6;
+      }
-        break;
+    } else if (!strcmp("-m", *argv)) {
-      case 'd':
+      lock_memory = 1;
    } else if (!strcmp("-r", *argv)) {
      reload = 1;
    } else if (!strcmp("-R", *argv)) {
      restarted = 1;
    } else if (!strcmp("-u", *argv)) {
      ++argv, --argc;
      if (argc == 0) {
        LOG_FATAL(LOGF_Main, "Missing user name");
      } else {
        user = *argv;
      }
    } else if (!strcmp("-s", *argv)) {
      do_init_rtc = 1;
    } else if (!strcmp("-v", *argv) || !strcmp("--version",*argv)) {
      /* This write to the terminal is OK, it comes before we turn into a daemon */
      printf("chronyd (chrony) version %s\n", CHRONY_VERSION);
      exit(0);
    } else if (!strcmp("-n", *argv)) {
      nofork = 1;
    } else if (!strcmp("-d", *argv)) {
      debug++;
      nofork = 1;
      system_log = 0;
-        break;
+    } else if (!strcmp("-q", *argv)) {
      case 'f':
        conf_file = optarg;
        break;
      case 'F':
        scfilter_level = parse_int_arg(optarg);
        break;
      case 'l':
        log_file = optarg;
        break;
      case 'm':
        lock_memory = 1;
        break;
      case 'n':
        nofork = 1;
        break;
      case 'P':
        sched_priority = parse_int_arg(optarg);
        break;
      case 'q':
      ref_mode = REF_ModeUpdateOnce;
      nofork = 1;
        client_only = 0;
      system_log = 0;
-        break;
+    } else if (!strcmp("-Q", *argv)) {
      case 'Q':
      ref_mode = REF_ModePrintOnce;
      nofork = 1;
        client_only = 1;
        clock_control = 0;
      system_log = 0;
    } else if (!strcmp("-4", *argv)) {
      address_family = IPADDR_INET4;
    } else if (!strcmp("-6", *argv)) {
      address_family = IPADDR_INET6;
    } else if (*argv[0] == '-') {
      LOG_FATAL(LOGF_Main, "Unrecognized command line option [%s]", *argv);
    } else {
      /* Process remaining arguments and configuration lines */
      config_args = argc;
      break;
      case 'r':
        reload = 1;
        break;
      case 'R':
        restarted = 1;
        break;
      case 's':
        do_init_rtc = 1;
        break;
      case 't':
        timeout = parse_int_arg(optarg);
        break;
      case 'u':
        user = optarg;
        break;
      case 'v':
        print_version();
        return 0;
      case 'x':
        clock_control = 0;
        break;
      default:
        print_help(progname);
        return opt != 'h';
    }
  }
-  if (getuid() && !client_only)
+  if (getuid() != 0) {
-    LOG_FATAL("Not superuser");
+    /* This write to the terminal is OK, it comes before we turn into a daemon */
    fprintf(stderr,"Not superuser\n");
    exit(1);
  }
  /* Turn into a daemon */
  if (!nofork) {
    go_daemon();
  }
-  if (log_file) {
+  if (system_log) {
    LOG_OpenFileLog(log_file);
  } else if (system_log) {
    LOG_OpenSystemLog();
  }
  LOG_SetDebugLevel(debug);
-  LOG(LOGS_INFO, "chronyd version %s starting (%s)", CHRONY_VERSION, CHRONYD_FEATURES);
+  LOG(LOGS_INFO, LOGF_Main, "chronyd version %s starting", CHRONY_VERSION);
  DNS_SetAddressFamily(address_family);
-  CNF_Initialise(restarted, client_only);
+  CNF_SetRestarted(restarted);
  /* Parse the config file or the remaining command line arguments */
  config_args = argc - optind;
  if (!config_args) {
    CNF_ReadFile(conf_file);
  } else {
-    for (; optind < argc; optind++)
+    do {
-      CNF_ParseLine(NULL, config_args + optind - argc + 1, argv[optind]);
+      CNF_ParseLine(NULL, config_args - argc + 1, *argv);
    } while (++argv, --argc);
  }
-  /* Check whether another chronyd may already be running */
+  /* Check whether another chronyd may already be running.  Do this after
-  check_pidfile();
+   * forking, so that message logging goes to the right place (i.e. syslog), in
   * case this chronyd is being run from a boot script. */
  if (maybe_another_chronyd_running(&other_pid)) {
    LOG_FATAL(LOGF_Main, "Another chronyd may already be running (pid=%d), check lockfile (%s)",
              other_pid, CNF_GetPidFile());
  }
-  if (!user)
+  /* Write our lockfile to prevent other chronyds running.  This has *GOT* to
-    user = CNF_GetUser();
+   * be done *AFTER* the daemon-creation fork() */
  write_lockfile();
  pw = getpwnam(user);
  if (!pw)
    LOG_FATAL("Could not get user/group ID of %s", user);
  /* Create directories for sockets, log files, and dump files */
  CNF_CreateDirs(pw->pw_uid, pw->pw_gid);
  /* Write our pidfile to prevent other instances from running */
  write_pidfile();
  PRV_Initialise();
  LCL_Initialise();
  SCH_Initialise();
-  SYS_Initialise(clock_control);
+  SYS_Initialise();
  NIO_Initialise(address_family);
  CAM_Initialise(address_family);
  RTC_Initialise(do_init_rtc);
  SRC_Initialise();
  RCL_Initialise();
  KEY_Initialise();
  /* Open privileged ports before dropping root */
  CAM_Initialise(address_family);
  NIO_Initialise(address_family);
  NCR_Initialise();
  CNF_SetupAccessRestrictions();
  /* Command-line switch must have priority */
  if (!sched_priority) {
    sched_priority = CNF_GetSchedPriority();
@@ -566,28 +474,28 @@ int main
    SYS_LockMemory();
  }
-  /* Drop root privileges if the specified user has a non-zero UID */
+  if (!user) {
-  if (!geteuid() && (pw->pw_uid || pw->pw_gid))
+    user = CNF_GetUser();
-    SYS_DropRoot(pw->pw_uid, pw->pw_gid);
+  }
  if (user && strcmp(user, "root")) {
    SYS_DropRoot(user);
  }
  LOG_CreateLogFileDir();
  REF_Initialise();
  SST_Initialise();
  BRD_Initialise();
  NCR_Initialise();
  NSR_Initialise();
  NSD_Initialise();
  CLG_Initialise();
  MNL_Initialise();
  TMC_Initialise();
  SMT_Initialise();
  /* From now on, it is safe to do finalisation on exit */
  initialised = 1;
-  UTI_SetQuitSignalsHandler(signal_cleanup, 1);
+  CNF_SetupAccessRestrictions();
  CAM_OpenUnixSocket();
  if (scfilter_level)
    SYS_EnableSystemCallFilter(scfilter_level);
  if (ref_mode == REF_ModeNormal && CNF_GetInitSources() > 0) {
    ref_mode = REF_ModeInitStepSlew;
@@ -596,20 +504,24 @@ int main
  REF_SetModeEndHandler(reference_mode_end);
  REF_SetMode(ref_mode);
  if (timeout > 0)
    SCH_AddTimeoutByDelay(timeout, quit_timeout, NULL);
  if (do_init_rtc) {
    RTC_TimeInit(post_init_rtc_hook, NULL);
  } else {
    post_init_rtc_hook(NULL);
  }
  signal(SIGINT, signal_cleanup);
  signal(SIGTERM, signal_cleanup);
 #if !defined(WINNT)
  signal(SIGQUIT, signal_cleanup);
  signal(SIGHUP, signal_cleanup);
 #endif /* WINNT */
  /* The program normally runs under control of the main loop in
     the scheduler. */
  SCH_MainLoop();
-  LOG(LOGS_INFO, "chronyd exiting");
+  LOG(LOGS_INFO, LOGF_Main, "chronyd exiting");
  MAI_CleanupAndExit();
--- a/37
+++ b/37
@@ -1,6 +1,6 @@
 #!/bin/sh
-LANG=C.UTF-8
+LANG=C
 export LANG
 if [ $# -ne 1 ]; then
@@ -11,6 +11,7 @@ fi
 version=$1
 tag=$version
 subdir=chrony-${version}
 mandate=$(date +'%B %Y')
 umask 022
@@ -36,13 +37,39 @@ cd RELEASES/$subdir || exit 1
 echo $version > version.txt
-./configure && make -C doc man txt || exit 1
+sed -i -e "s%@@VERSION@@%${version}%" examples/chrony.spec
-iconv -f utf-8 -t ascii//TRANSLIT < doc/installation.txt > INSTALL
+for m in chrony.1 chronyc.1.in chrony.conf.5.in chronyd.8.in; do
-iconv -f utf-8 -t ascii//TRANSLIT < doc/faq.txt > FAQ
+  sed -e "s%@VERSION@%${version}%;s%@MAN_DATE@%${mandate}%" \
    < $m > ${m}_
  mv -f ${m}_ $m
 done
 ./configure && make chrony.txt || exit 1
 mv chrony.txt chrony.txt_
 make distclean
-rm -f make_release .gitignore
+mv chrony.txt_ chrony.txt
 awk '/^[1-9] Installation$/{p=1}
     /^[1-9]\.. Support for line editing/{exit}; p' chrony.txt | \
  tail -n +4 > INSTALL
 if [ $(wc -l < INSTALL) -gt 100 -o $(wc -l < INSTALL) -lt 85 ]; then
  echo "INSTALL generated incorrectly?"
  exit 3
 fi
 awk '/^[1-9] Frequently asked questions$/{p=1}
     /^Appendix A GNU General Public License$/{exit}; p' chrony.txt | \
 tail -n +4 | sed 's/^[1-9]\.\([1-9]\)/\1/' | sed 's/^----/--/' | \
 sed 's/^====/==/' > FAQ
 if [ $(wc -l < FAQ) -gt 400 -o $(wc -l < FAQ) -lt 200 ]; then
  echo "FAQ generated incorrectly?"
  exit 3
 fi
 rm -f config.h config.log make_release .gitignore
 cd ..
 tar cv --owner root --group root $subdir | gzip -9 > ${subdir}.tar.gz
--- a/manual.c
+++ b/manual.c
@@ -47,15 +47,13 @@ static int enabled = 0;
 /* More recent samples at highest indices */
 typedef struct {
-  struct timespec when; /* This is our 'cooked' time */
+  struct timeval when; /* This is our 'cooked' time */
  double orig_offset; /*+ Not modified by slew samples */
  double offset; /*+ if we are fast of the supplied reference */
  double residual; /*+ regression residual (sign convention given by
                     (measured-predicted)) */
 } Sample;
 #define MIN_SAMPLE_SEPARATION 1.0
 #define MAX_SAMPLES 16
 static Sample samples[16];
@@ -64,8 +62,8 @@ static int n_samples;
 /* ================================================== */
 static void
-slew_samples(struct timespec *raw,
+slew_samples(struct timeval *raw,
-             struct timespec *cooked,
+             struct timeval *cooked, 
             double dfreq,
             double doffset,
             LCL_ChangeType change_type,
@@ -97,8 +95,7 @@ MNL_Finalise(void)
 /* ================================================== */
 static void
-estimate_and_set_system(struct timespec *now, int offset_provided, double offset,
+estimate_and_set_system(struct timeval *now, int offset_provided, double offset, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
                        double *reg_offset, double *dfreq_ppm, double *new_afreq_ppm)
 {
  double agos[MAX_SAMPLES], offsets[MAX_SAMPLES];
  double b0, b1;
@@ -109,26 +106,32 @@ estimate_and_set_system(struct timespec *now, int offset_provided, double offset
  int found_freq;
  double slew_by;
  b0 = offset_provided ? offset : 0.0;
  b1 = freq = 0.0;
  found_freq = 0;
  if (n_samples > 1) {
    for (i=0; i<n_samples; i++) {
-      agos[i] = UTI_DiffTimespecsToDouble(&samples[n_samples - 1].when, &samples[i].when);
+      UTI_DiffTimevalsToDouble(&agos[i], &samples[n_samples-1].when, &samples[i].when);
      offsets[i] = samples[i].offset;
    }
-    if (RGR_FindBestRobustRegression(agos, offsets, n_samples, 1.0e-8,
+    RGR_FindBestRobustRegression(agos, offsets, n_samples,
-                                     &b0, &b1, &n_runs, &best_start)) {
+                                 1.0e-8, /* 0.01ppm easily good enough for this! */
                                 &b0, &b1, &n_runs, &best_start);
    /* Ignore b0 from regression; treat offset as being the most
       recently entered value.  (If the administrator knows he's put
       an outlier in, he will rerun the settime operation.)   However,
       the frequency estimate comes from the regression. */
    freq = -b1;
    found_freq = 1;
    }
  } else {
    if (offset_provided) {
      b0 = offset;
    } else {
      b0 = 0.0;
    }
    b1 = freq = 0.0;
    found_freq = 0;
    agos[0] = 0.0;
    offsets[0] = b0;
  }
@@ -140,20 +143,21 @@ estimate_and_set_system(struct timespec *now, int offset_provided, double offset
  }
  if (found_freq) {
-    LOG(LOGS_INFO, "Making a frequency change of %.3f ppm and a slew of %.6f",
+    LOG(LOGS_INFO, LOGF_Manual,
        "Making a frequency change of %.3f ppm and a slew of %.6f",
        1.0e6 * freq, slew_by);
    REF_SetManualReference(now,
                           slew_by,
                           freq, skew);
  } else {
-    LOG(LOGS_INFO, "Making a slew of %.6f", slew_by);
+    LOG(LOGS_INFO, LOGF_Manual, "Making a slew of %.6f", slew_by);
    REF_SetManualReference(now,
                           slew_by,
                           0.0, skew);
  }
-  if (reg_offset) *reg_offset = b0;
+  if (offset_cs) *offset_cs = (long)(0.5 + 100.0 * b0);
  if (dfreq_ppm) *dfreq_ppm = 1.0e6 * freq;
  if (new_afreq_ppm) *new_afreq_ppm = LCL_ReadAbsoluteFrequency();
@@ -167,28 +171,18 @@ estimate_and_set_system(struct timespec *now, int offset_provided, double offset
 /* ================================================== */
 int
-MNL_AcceptTimestamp(struct timespec *ts, double *reg_offset, double *dfreq_ppm, double *new_afreq_ppm)
+MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
 {
-  struct timespec now;
+  struct timeval now;
-  double offset, diff;
+  double offset;
  int i;
  if (enabled) {
    /* Check whether timestamp is within margin of old one */
    LCL_ReadCookedTime(&now, NULL);
-    /* Make sure the provided timestamp is sane and the sample
+    UTI_DiffTimevalsToDouble(&offset, &now, ts);
       is not too close to the last one */
    if (!UTI_IsTimeOffsetSane(ts, 0.0))
     return 0;
    if (n_samples) {
      diff = UTI_DiffTimespecsToDouble(&now, &samples[n_samples - 1].when);
      if (diff < MIN_SAMPLE_SEPARATION)
        return 0;
    }
    offset = UTI_DiffTimespecsToDouble(&now, ts);
    /* Check if buffer full up */
    if (n_samples == MAX_SAMPLES) {
@@ -204,7 +198,7 @@ MNL_AcceptTimestamp(struct timespec *ts, double *reg_offset, double *dfreq_ppm,
    samples[n_samples].orig_offset = offset;
    ++n_samples;
-    estimate_and_set_system(&now, 1, offset, reg_offset, dfreq_ppm, new_afreq_ppm);
+    estimate_and_set_system(&now, 1, offset, offset_cs, dfreq_ppm, new_afreq_ppm);
    return 1;
@@ -218,8 +212,8 @@ MNL_AcceptTimestamp(struct timespec *ts, double *reg_offset, double *dfreq_ppm,
 /* ================================================== */
 static void
-slew_samples(struct timespec *raw,
+slew_samples(struct timeval *raw,
-             struct timespec *cooked,
+             struct timeval *cooked, 
             double dfreq,
             double doffset,
             LCL_ChangeType change_type,
@@ -233,7 +227,7 @@ slew_samples(struct timespec *raw,
  }
  for (i=0; i<n_samples; i++) {
-    UTI_AdjustTimespec(&samples[i].when, cooked, &samples[i].when, &delta_time,
+    UTI_AdjustTimeval(&samples[i].when, cooked, &samples[i].when, &delta_time,
        dfreq, doffset);
    samples[i].offset += delta_time;
  }
@@ -264,14 +258,6 @@ MNL_Reset(void)
  n_samples = 0;
 }
 /* ================================================== */
 int
 MNL_IsEnabled(void)
 {
  return enabled;
 }
 /* ================================================== */
 /* Generate report data for the REQ_MANUAL_LIST command/monitoring
   protocol */
@@ -303,7 +289,7 @@ int
 MNL_DeleteSample(int index)
 {
  int i;
-  struct timespec now;
+  struct timeval now;
  if ((index < 0) || (index >= n_samples)) {
    return 0;
--- a/manual.h
+++ b/manual.h
@@ -33,12 +33,11 @@
 extern void MNL_Initialise(void);
 extern void MNL_Finalise(void);
-extern int MNL_AcceptTimestamp(struct timespec *ts, double *reg_offset, double *dfreq_ppm, double *new_afreq_ppm);
+extern int MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm);
 extern void MNL_Enable(void);
 extern void MNL_Disable(void);
 extern void MNL_Reset(void);
 extern int MNL_IsEnabled(void);
 extern void MNL_ReportSamples(RPT_ManualSamplesReport *report, int max, int *n);
 extern int MNL_DeleteSample(int index);
--- a/memory.c
+++ b/memory.c
@@ -1,93 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2014, 2017
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Utility functions for memory allocation.
  */
 #include "config.h"
 #include "logging.h"
 #include "memory.h"
 void *
 Malloc(size_t size)
 {
  void *r;
  r = malloc(size);
  if (!r && size)
    LOG_FATAL("Could not allocate memory");
  return r;
 }
 void *
 Realloc(void *ptr, size_t size)
 {
  void *r;
  r = realloc(ptr, size);
  if (!r && size)
    LOG_FATAL("Could not allocate memory");
  return r;
 }
 static size_t
 get_array_size(size_t nmemb, size_t size)
 {
  size_t array_size;
  array_size = nmemb * size;
  /* Check for overflow */
  if (nmemb > 0 && array_size / nmemb != size)
    LOG_FATAL("Could not allocate memory");
  return array_size;
 }
 void *
 Malloc2(size_t nmemb, size_t size)
 {
  return Malloc(get_array_size(nmemb, size));
 }
 void *
 Realloc2(void *ptr, size_t nmemb, size_t size)
 {
  return Realloc(ptr, get_array_size(nmemb, size));
 }
 char *
 Strdup(const char *s)
 {
  void *r;
  r = strdup(s);
  if (!r)
    LOG_FATAL("Could not allocate memory");
  return r;
 }
--- a/memory.h
+++ b/memory.h
@@ -27,19 +27,11 @@
 #ifndef GOT_MEMORY_H
 #define GOT_MEMORY_H
-#include "sysincl.h"
+#define Malloc(x) malloc(x)
-
+#define MallocNew(T) ((T *) malloc(sizeof(T)))
-/* Wrappers checking for errors */
+#define MallocArray(T, n) ((T *) malloc((n) * sizeof(T)))
-extern void *Malloc(size_t size);
+#define Realloc(x,y) realloc(x,y)
-extern void *Realloc(void *ptr, size_t size);
+#define ReallocArray(T,n,x) ((T *) realloc((void *)(x), (n)*sizeof(T)))
 extern void *Malloc2(size_t nmemb, size_t size);
 extern void *Realloc2(void *ptr, size_t nmemb, size_t size);
 extern char *Strdup(const char *s);
 /* Convenient macros */
 #define MallocNew(T) ((T *) Malloc(sizeof(T)))
 #define MallocArray(T, n) ((T *) Malloc2(n, sizeof(T)))
 #define ReallocArray(T, n, x) ((T *) Realloc2((void *)(x), n, sizeof(T)))
 #define Free(x) free(x)
 #endif /* GOT_MEMORY_H */
--- a/mkdirpp.c
+++ b/mkdirpp.c
@@ -0,0 +1,134 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2002
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  A function for creating a directory and any parent directories that
  don't exist.
  */
 #include "config.h"
 #include "sysincl.h"
 #include "mkdirpp.h"
 static int
 do_dir(char *p)
 {
  int status;
  struct stat buf;
 #if defined(TEST)
  fprintf(stderr, "do_dir(%s)\n", p);
 #endif
  /* See if directory exists */
  status = stat(p, &buf);
  if (status < 0) {
    if (errno == ENOENT) {
      /* Try to create directory */
      status = mkdir(p, 0755);
      return status;
    } else {
      return status;
    }
  }
  if (!S_ISDIR(buf.st_mode)) {
    return -1;
  }
  return 0;
 }
 /* ================================================== */
 /* Return 0 if the directory couldn't be created, 1 if it could (or
   already existed) */
 int
 mkdir_and_parents(const char *path)
 {
  char *p;
  int len;
  int i, j, k, last;
  len = strlen(path);
  p = (char *) malloc(1 + len);
  i = k = 0;
  while (1) {
    p[i++] = path[k++];
    if (path[k] == '/' || !path[k]) {
      p[i] = 0;
      if (do_dir(p) < 0) {
        free(p);
        return 0;
      }
      if (!path[k]) {
        /* End of the string */
        break;
      }
      /* check whether its a trailing / or group of / */
      last = 1;
      j = k+1;
      while (path[j]) {
        if (path[j] != '/') {
          k = j - 1; /* Pick up a / into p[] thru the assignment at the top of the loop */
          last = 0;
          break;
        }
        j++;
      }
      if (last) {
        break;
      }
    }
    if (!path[k]) break;
  }  
  free(p);
  return 1;
 }
 /* ================================================== */
 #if defined(TEST)
 int main(int argc, char **argv) {
  if (argc > 1) {
    /* Invert sense of result */
    return mkdir_and_parents(argv[1]) ? 0 : 1;
  } else {
    return 1;
  }
 }
 #endif
--- a/mkdirpp.h
+++ b/mkdirpp.h
@@ -2,7 +2,7 @@
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
- * Copyright (C) Miroslav Lichvar  2015
+ * Copyright (C) Richard P. Curnow  1997-2002
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -21,28 +21,11 @@
  =======================================================================
  This module implements time smoothing.
   */
-#ifndef GOT_SMOOTH_H
+#ifndef GOT_MKDIRPP_H
-#define GOT_SMOOTH_H
+#define GOT_MKDIRPP_H
-#include "reports.h"
+extern int mkdir_and_parents(const char *path);
 extern void SMT_Initialise(void);
 extern void SMT_Finalise(void);
 extern int SMT_IsEnabled(void);
 extern double SMT_GetOffset(struct timespec *now);
 extern void SMT_Activate(struct timespec *now);
 extern void SMT_Reset(struct timespec *now);
 extern void SMT_Leap(struct timespec *now, int leap);
 extern int SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timespec *now);
 #endif
--- a/nameserv.c
+++ b/nameserv.c
@@ -30,9 +30,6 @@
 #include "sysincl.h"
 #include <netdb.h>
 #include <resolv.h>
 #include "nameserv.h"
 #include "util.h"
@@ -47,28 +44,14 @@ DNS_SetAddressFamily(int family)
 }
 DNS_Status 
-DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
+DNS_Name2IPAddress(const char *name, IPAddr *addr)
 {
 #ifdef HAVE_GETADDRINFO
  struct addrinfo hints, *res, *ai;
-  int i, result;
+  int result;
  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
  memset(&hints, 0, sizeof (hints));
  switch (address_family) {
    case IPADDR_INET4:
      hints.ai_family = AF_INET;
      break;
 #ifdef FEAT_IPV6
    case IPADDR_INET6:
      hints.ai_family = AF_INET6;
      break;
 #endif
    default:
  hints.ai_family = AF_UNSPEC;
  }
  hints.ai_socktype = SOCK_STREAM;
  result = getaddrinfo(name, NULL, &hints, &res);
@@ -81,42 +64,29 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
 #endif
  }
-  for (ai = res, i = 0; i < max_addrs && ai != NULL; ai = ai->ai_next) {
+  for (ai = res; !result && ai != NULL; ai = ai->ai_next) {
    switch (ai->ai_family) {
      case AF_INET:
-        if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET4)
+        addr->family = IPADDR_INET4;
-          continue;
+        addr->addr.in4 = ntohl(((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr);
-        ip_addrs[i].family = IPADDR_INET4;
+        result = 1;
        ip_addrs[i].addr.in4 = ntohl(((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr);
        i++;
        break;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
      case AF_INET6:
-        if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET6)
+        addr->family = IPADDR_INET6;
-          continue;
+        memcpy(&addr->addr.in6, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr, sizeof (addr->addr.in6));
-        ip_addrs[i].family = IPADDR_INET6;
+        result = 1;
        memcpy(&ip_addrs[i].addr.in6, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
               sizeof (ip_addrs->addr.in6));
        i++;
        break;
 #endif
    }
    if (result && address_family != IPADDR_UNSPEC && address_family != addr->family)
      result = 0;
  }
  for (; i < max_addrs; i++)
        ip_addrs[i].family = IPADDR_UNSPEC;
  freeaddrinfo(res);
-
+  return result ? DNS_Success : DNS_Failure;
  return !max_addrs || ip_addrs[0].family != IPADDR_UNSPEC ? DNS_Success : DNS_Failure;
 #else
  struct hostent *host;
  int i;
  if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET4)
    return DNS_Failure;
  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
  host = gethostbyname(name);
@@ -124,17 +94,8 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
    if (h_errno == TRY_AGAIN)
      return DNS_TryAgain;
  } else {
-    if (host->h_addrtype != AF_INET || !host->h_addr_list[0])
+    addr->family = IPADDR_INET4;
-      return DNS_Failure;
+    addr->addr.in4 = ntohl(*(uint32_t *)host->h_addr_list[0]);
    for (i = 0; host->h_addr_list[i] && i < max_addrs; i++) {
      ip_addrs[i].family = IPADDR_INET4;
      ip_addrs[i].addr.in4 = ntohl(*(uint32_t *)host->h_addr_list[i]);
    }
    for (; i < max_addrs; i++)
      ip_addrs[i].family = IPADDR_UNSPEC;
    return DNS_Success;
  }
@@ -154,14 +115,33 @@ DNS_IPAddress2Name(IPAddr *ip_addr, char *name, int len)
 {
  char *result = NULL;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
  struct sockaddr_in in4;
  struct sockaddr_in6 in6;
  socklen_t slen;
  char hbuf[NI_MAXHOST];
-  slen = UTI_IPAndPortToSockaddr(ip_addr, 0, (struct sockaddr *)&in6);
+  switch (ip_addr->family) {
-  if (!getnameinfo((struct sockaddr *)&in6, slen, hbuf, sizeof (hbuf), NULL, 0, 0))
+    case IPADDR_INET4:
      memset(&in4, 0, sizeof (in4));
 #ifdef SIN6_LEN
      in4.sin_len = sizeof (in4);
 #endif
      in4.sin_family = AF_INET;
      in4.sin_addr.s_addr = htonl(ip_addr->addr.in4);
      if (!getnameinfo((const struct sockaddr *)&in4, sizeof (in4), hbuf, sizeof (hbuf), NULL, 0, 0))
        result = hbuf;
      break;
    case IPADDR_INET6:
      memset(&in6, 0, sizeof (in6));
 #ifdef SIN6_LEN
      in6.sin6_len = sizeof (in6);
 #endif
      in6.sin6_family = AF_INET6;
      memcpy(&in6.sin6_addr.s6_addr, ip_addr->addr.in6, sizeof (in6.sin6_addr.s6_addr));
      if (!getnameinfo((const struct sockaddr *)&in6, sizeof (in6), hbuf, sizeof (hbuf), NULL, 0, 0))
        result = hbuf;
      break;
  }
 #else
  struct hostent *host;
  uint32_t addr;
@@ -171,7 +151,7 @@ DNS_IPAddress2Name(IPAddr *ip_addr, char *name, int len)
      addr = htonl(ip_addr->addr.in4);
      host = gethostbyaddr((const char *) &addr, sizeof (ip_addr), AF_INET);
      break;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
    case IPADDR_INET6:
      host = gethostbyaddr((const void *) ip_addr->addr.in6, sizeof (ip_addr->addr.in6), AF_INET6);
      break;
--- a/nameserv.h
+++ b/nameserv.h
@@ -39,10 +39,7 @@ typedef enum {
 /* Resolve names only to selected address family */
 extern void DNS_SetAddressFamily(int family);
-/* Maximum number of addresses returned by DNS_Name2IPAddress */
+extern DNS_Status DNS_Name2IPAddress(const char *name, IPAddr *addr);
 #define DNS_MAX_ADDRESSES 16
 extern DNS_Status DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs);
 extern int DNS_IPAddress2Name(IPAddr *ip_addr, char *name, int len);
--- a/nameserv_async.c
+++ b/nameserv_async.c
@@ -31,10 +31,11 @@
 #include "nameserv_async.h"
 #include "logging.h"
 #include "memory.h"
 #include "privops.h"
 #include "sched.h"
 #include "util.h"
 #ifdef FEAT_ASYNCDNS
 #ifdef USE_PTHREAD_ASYNCDNS
 #include <pthread.h>
@@ -43,7 +44,7 @@
 struct DNS_Async_Instance {
  const char *name;
  DNS_Status status;
-  IPAddr addresses[DNS_MAX_ADDRESSES];
+  IPAddr addr;
  DNS_NameResolveHandler handler;
  void *arg;
@@ -60,7 +61,7 @@ start_resolving(void *anything)
 {
  struct DNS_Async_Instance *inst = (struct DNS_Async_Instance *)anything;
-  inst->status = PRV_Name2IPAddress(inst->name, inst->addresses, DNS_MAX_ADDRESSES);
+  inst->status = DNS_Name2IPAddress(inst->name, &inst->addr);
  /* Notify the main thread that the result is ready */
  if (write(inst->pipe[1], "", 1) < 0)
@@ -72,26 +73,21 @@ start_resolving(void *anything)
 /* ================================================== */
 static void
-end_resolving(int fd, int event, void *anything)
+end_resolving(void *anything)
 {
  struct DNS_Async_Instance *inst = (struct DNS_Async_Instance *)anything;
  int i;
  if (pthread_join(inst->thread, NULL)) {
-    LOG_FATAL("pthread_join() failed");
+    LOG_FATAL(LOGF_Nameserv, "pthread_join() failed");
  }
  resolving_threads--;
-  SCH_RemoveFileHandler(inst->pipe[0]);
+  SCH_RemoveInputFileHandler(inst->pipe[0]);
  close(inst->pipe[0]);
  close(inst->pipe[1]);
-  for (i = 0; inst->status == DNS_Success && i < DNS_MAX_ADDRESSES &&
+  (inst->handler)(inst->status, &inst->addr, inst->arg);
              inst->addresses[i].family != IPADDR_UNSPEC; i++)
    ;
  (inst->handler)(inst->status, i, inst->addresses, inst->arg);
  Free(inst);
 }
@@ -110,20 +106,17 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
  inst->status = DNS_Failure;
  if (pipe(inst->pipe)) {
-    LOG_FATAL("pipe() failed");
+    LOG_FATAL(LOGF_Nameserv, "pipe() failed");
  }
  UTI_FdSetCloexec(inst->pipe[0]);
  UTI_FdSetCloexec(inst->pipe[1]);
  resolving_threads++;
  assert(resolving_threads <= 1);
  if (pthread_create(&inst->thread, NULL, start_resolving, inst)) {
-    LOG_FATAL("pthread_create() failed");
+    LOG_FATAL(LOGF_Nameserv, "pthread_create() failed");
  }
-  SCH_AddFileHandler(inst->pipe[0], SCH_FILE_INPUT, end_resolving, inst);
+  SCH_AddInputFileHandler(inst->pipe[0], end_resolving, inst);
 }
 /* ================================================== */
@@ -131,3 +124,21 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
 #else
 #error
 #endif
 #else
 /* This is a blocking implementation used when nothing else is available */
 void
 DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *anything)
 {
  IPAddr addr;
  DNS_Status status;
  status = DNS_Name2IPAddress(name, &addr);
  (handler)(status, &addr, anything);
 }
 /* ================================================== */
 #endif
--- a/nameserv_async.h
+++ b/nameserv_async.h
@@ -31,10 +31,11 @@
 #include "nameserv.h"
 /* Function type for callback to process the result */
-typedef void (*DNS_NameResolveHandler)(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *anything);
+typedef void (*DNS_NameResolveHandler)(DNS_Status status, IPAddr *ip_addr, void *anything);
 /* Request resolving of a name to IP address. The handler will be
-   called when the result is available. */
+   called when the result is available, but it may be also called
   directly from this function call. */
 extern void DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *anything);
 #endif
--- a/ntp.h
+++ b/ntp.h
@@ -38,30 +38,7 @@ typedef struct {
 typedef uint32_t NTP_int32;
-/* The UDP port number used by NTP */
+#define MAX_NTP_AUTH_DATA_LEN MAX_HASH_LENGTH
 #define NTP_PORT 123
 /* The NTP protocol version that we support */
 #define NTP_VERSION 4
 /* Maximum stratum number (infinity) */
 #define NTP_MAX_STRATUM 16
 /* The minimum valid length of an extension field */
 #define NTP_MIN_EXTENSION_LENGTH 16
 /* The maximum assumed length of all extension fields in received
   packets (RFC 5905 doesn't specify a limit on length or number of
   extension fields in one packet) */
 #define NTP_MAX_EXTENSIONS_LENGTH 1024
 /* The minimum and maximum supported length of MAC */
 #define NTP_MIN_MAC_LENGTH (4 + 16)
 #define NTP_MAX_MAC_LENGTH (4 + MAX_HASH_LENGTH)
 /* The maximum length of MAC in NTPv4 packets which allows deterministic
   parsing of extension fields (RFC 7822) */
 #define NTP_MAX_V4_MAC_LENGTH (4 + 20)
 /* Type definition for leap bits */
 typedef enum {
@@ -92,48 +69,24 @@ typedef struct {
  NTP_int64 originate_ts;
  NTP_int64 receive_ts;
  NTP_int64 transmit_ts;
  /* Optional extension fields, we don't send packets with them yet */
  /* uint8_t extensions[] */
  /* Optional message authentication code (MAC) */
  NTP_int32 auth_keyid;
-  uint8_t auth_data[NTP_MAX_MAC_LENGTH - 4];
+  uint8_t auth_data[MAX_NTP_AUTH_DATA_LEN];
 } NTP_Packet;
-#define NTP_NORMAL_PACKET_LENGTH (int)offsetof(NTP_Packet, auth_keyid)
+/* We have to declare a buffer type to hold a datagram read from the
   network.  Even though we won't be using them (yet?!), this must be
   large enough to hold NTP control messages. */
-/* The buffer used to hold a datagram read from the network */
+/* Define the maximum number of bytes that can be read in a single
-typedef struct {
+   message.  (This is cribbed from ntp.h in the xntpd source code). */
 #define MAX_NTP_MESSAGE_SIZE (468+12+16+4)
 typedef union {
  NTP_Packet ntp_pkt;
-  uint8_t extensions[NTP_MAX_EXTENSIONS_LENGTH];
+  uint8_t arbitrary[MAX_NTP_MESSAGE_SIZE];
-} NTP_Receive_Buffer;
+} ReceiveBuffer;
-/* Macros to work with the lvm field */
+#define NTP_NORMAL_PACKET_SIZE offsetof(NTP_Packet, auth_keyid)
 #define NTP_LVM_TO_LEAP(lvm) (((lvm) >> 6) & 0x3)
 #define NTP_LVM_TO_VERSION(lvm) (((lvm) >> 3) & 0x7)
 #define NTP_LVM_TO_MODE(lvm) ((lvm) & 0x7)
 #define NTP_LVM(leap, version, mode) \
  ((((leap) << 6) & 0xc0) | (((version) << 3) & 0x38) | ((mode) & 0x07))
 /* Special NTP reference IDs */
 #define NTP_REFID_UNSYNC 0x0UL
 #define NTP_REFID_LOCAL 0x7F7F0101UL /* 127.127.1.1 */
 #define NTP_REFID_SMOOTH 0x7F7F01FFUL /* 127.127.1.255 */
 /* Structure used to save NTP measurements.  time is the local time at which
   the sample is to be considered to have been made and offset is the offset at
   the time (positive indicates that the local clock is slow relative to the
   source).  root_delay/root_dispersion include peer_delay/peer_dispersion. */
 typedef struct {
  struct timespec time;
  double offset;
  double peer_delay;
  double peer_dispersion;
  double root_delay;
  double root_dispersion;
  int stratum;
  NTP_Leap leap;
 } NTP_Sample;
 #endif /* GOT_NTP_H */
--- a/ntp_core.c
+++ b/ntp_core.c
--- a/ntp_core.h
+++ b/ntp_core.h
@@ -38,18 +38,6 @@ typedef enum {
  NTP_SERVER, NTP_PEER
 } NTP_Source_Type;
 typedef enum {
  NTP_TS_DAEMON = 0,
  NTP_TS_KERNEL,
  NTP_TS_HARDWARE
 } NTP_Timestamp_Source;
 typedef struct {
  struct timespec ts;
  double err;
  NTP_Timestamp_Source source;
 } NTP_Local_Timestamp;
 /* This is a private data type used for storing the instance record for
   each source that we are chiming with */
 typedef struct NCR_Instance_Record *NCR_Instance;
@@ -70,38 +58,23 @@ extern void NCR_StartInstance(NCR_Instance instance);
 /* Reset an instance */
 extern void NCR_ResetInstance(NCR_Instance inst);
 /* Reset polling interval of an instance */
 extern void NCR_ResetPoll(NCR_Instance instance);
 /* Change the remote address of an instance */
 extern void NCR_ChangeRemoteAddress(NCR_Instance inst, NTP_Remote_Address *remote_addr);
 /* This routine is called when a new packet arrives off the network,
   and it relates to a source we have an ongoing protocol exchange with */
-extern int NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
+extern void NCR_ProcessKnown(NTP_Packet *message, struct timeval *now, double now_err, NCR_Instance data, int sock_fd, int length);
                              NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
 /* This routine is called when a new packet arrives off the network,
   and we do not recognize its source */
-extern void NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+extern void NCR_ProcessUnknown(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
                                 NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
 /* This routine is called when a packet is sent to a source we have
   an ongoing protocol exchange with */
 extern void NCR_ProcessTxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
                               NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
 /* This routine is called when a packet is sent to a destination we
   do not recognize */
 extern void NCR_ProcessTxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
                                 NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
 /* Slew receive and transmit times in instance records */
-extern void NCR_SlewTimes(NCR_Instance inst, struct timespec *when, double dfreq, double doffset);
+extern void NCR_SlewTimes(NCR_Instance inst, struct timeval *when, double dfreq, double doffset);
-/* Take a particular source online (i.e. start sampling it) or offline
+/* Take a particular source online (i.e. start sampling it) */
-   (i.e. stop sampling it) */
+extern void NCR_TakeSourceOnline(NCR_Instance inst);
-extern void NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity);
+
 /* Take a particular source offline (i.e. stop sampling it, without
   marking it unreachable in the source selection stuff) */
 extern void NCR_TakeSourceOffline(NCR_Instance inst);
 extern void NCR_ModifyMinpoll(NCR_Instance inst, int new_minpoll);
@@ -119,8 +92,7 @@ extern void NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target);
 extern void NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_samples);
-extern void NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timespec *now);
+extern void NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timeval *now);
 extern void NCR_GetNTPReport(NCR_Instance inst, RPT_NTPReport *report);
 extern int NCR_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all);
 extern int NCR_CheckAccessRestriction(IPAddr *ip_addr);
@@ -130,10 +102,6 @@ extern void NCR_IncrementActivityCounters(NCR_Instance inst, int *online, int *o
 extern NTP_Remote_Address *NCR_GetRemoteAddress(NCR_Instance instance);
 extern uint32_t NCR_GetLocalRefid(NCR_Instance inst);
 extern int NCR_IsSyncPeer(NCR_Instance instance);
 extern void NCR_AddBroadcastDestination(IPAddr *addr, unsigned short port, int interval);
 #endif /* GOT_NTP_CORE_H */
--- a/ntp_io.c
+++ b/ntp_io.c
@@ -4,7 +4,7 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2003
 * Copyright (C) Timo Teras  2009
- * Copyright (C) Miroslav Lichvar  2009, 2013-2016, 2018
+ * Copyright (C) Miroslav Lichvar  2009, 2013-2014
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -30,7 +30,6 @@
 #include "sysincl.h"
 #include "array.h"
 #include "ntp_io.h"
 #include "ntp_core.h"
 #include "ntp_sources.h"
@@ -38,83 +37,37 @@
 #include "local.h"
 #include "logging.h"
 #include "conf.h"
 #include "privops.h"
 #include "util.h"
 #ifdef HAVE_LINUX_TIMESTAMPING
 #include "ntp_io_linux.h"
 #endif
 #define INVALID_SOCK_FD -1
 #define CMSGBUF_SIZE 256
 union sockaddr_in46 {
  struct sockaddr_in in4;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
  struct sockaddr_in6 in6;
 #endif
  struct sockaddr u;
 };
 struct Message {
  union sockaddr_in46 name;
  struct iovec iov;
  NTP_Receive_Buffer buf;
  /* Aligned buffer for control messages */
  struct cmsghdr cmsgbuf[CMSGBUF_SIZE / sizeof (struct cmsghdr)];
 };
 #ifdef HAVE_RECVMMSG
 #define MAX_RECV_MESSAGES 4
 #define MessageHeader mmsghdr
 #else
 /* Compatible with mmsghdr */
 struct MessageHeader {
  struct msghdr msg_hdr;
  unsigned int msg_len;
 };
 #define MAX_RECV_MESSAGES 1
 #endif
 /* Arrays of Message and MessageHeader */
 static ARR_Instance recv_messages;
 static ARR_Instance recv_headers;
 /* The server/peer and client sockets for IPv4 and IPv6 */
 static int server_sock_fd4;
 static int client_sock_fd4;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
 static int server_sock_fd6;
 static int client_sock_fd6;
 #endif
 /* Reference counters for server sockets to keep them open only when needed */
 static int server_sock_ref4;
 #ifdef FEAT_IPV6
 static int server_sock_ref6;
 #endif
 /* Flag indicating we create a new connected client socket for each
   server instead of sharing client_sock_fd4 and client_sock_fd6 */
 static int separate_client_sockets;
 /* Flag indicating the server sockets are not created dynamically when needed,
   either to have a socket for client requests when separate client sockets
   are disabled and client port is equal to server port, or the server port is
   disabled */
 static int permanent_server_sockets;
 /* Flag indicating the server IPv4 socket is bound to an address */
 static int bound_server_sock_fd4;
 /* Flag indicating that we have been initialised */
 static int initialised=0;
 /* ================================================== */
 /* Forward prototypes */
-static void read_from_socket(int sock_fd, int event, void *anything);
+static void read_from_socket(void *anything);
 /* ================================================== */
@@ -125,30 +78,21 @@ prepare_socket(int family, int port_number, int client_only)
  socklen_t my_addr_len;
  int sock_fd;
  IPAddr bind_address;
-  int events = SCH_FILE_INPUT, on_off = 1;
+  int on_off = 1;
  /* Open Internet domain UDP socket for NTP message transmissions */
  sock_fd = socket(family, SOCK_DGRAM, 0);
  if (sock_fd < 0) {
-    if (!client_only) {
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not open %s NTP socket : %s",
-      LOG(LOGS_ERR, "Could not open %s NTP socket : %s",
+        family == AF_INET ? "IPv4" : "IPv6", strerror(errno));
          UTI_SockaddrFamilyToString(family), strerror(errno));
    } else {
      DEBUG_LOG("Could not open %s NTP socket : %s",
                UTI_SockaddrFamilyToString(family), strerror(errno));
    }
    return INVALID_SOCK_FD;
  }
  /* Close on exec */
  UTI_FdSetCloexec(sock_fd);
  /* Enable non-blocking mode on server sockets */
  if (!client_only && fcntl(sock_fd, F_SETFL, O_NONBLOCK))
    DEBUG_LOG("Could not set O_NONBLOCK : %s", strerror(errno));
  /* Prepare local address */
  memset(&my_addr, 0, sizeof (my_addr));
  my_addr_len = 0;
@@ -171,11 +115,8 @@ prepare_socket(int family, int port_number, int client_only)
      my_addr.in4.sin_port = htons(port_number);
      my_addr_len = sizeof (my_addr.in4);
      if (!client_only)
        bound_server_sock_fd4 = my_addr.in4.sin_addr.s_addr != htonl(INADDR_ANY);
      break;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
    case AF_INET6:
      if (!client_only)
        CNF_GetBindAddress(IPADDR_INET6, &bind_address);
@@ -203,80 +144,76 @@ prepare_socket(int family, int port_number, int client_only)
  /* Make the socket capable of re-using an old address if binding to a specific port */
  if (port_number &&
      setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on_off, sizeof(on_off)) < 0) {
-    LOG(LOGS_ERR, "Could not set %s socket option", "SO_REUSEADDR");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set reuseaddr socket options");
    /* Don't quit - we might survive anyway */
  }
  /* Make the socket capable of sending broadcast pkts - needed for NTP broadcast mode */
  if (!client_only &&
      setsockopt(sock_fd, SOL_SOCKET, SO_BROADCAST, (char *)&on_off, sizeof(on_off)) < 0) {
-    LOG(LOGS_ERR, "Could not set %s socket option", "SO_BROADCAST");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set broadcast socket options");
    /* Don't quit - we might survive anyway */
  }
  /* Enable kernel/HW timestamping of packets */
 #ifdef HAVE_LINUX_TIMESTAMPING
  if (!NIO_Linux_SetTimestampSocketOptions(sock_fd, client_only, &events))
 #endif
 #ifdef SO_TIMESTAMPNS
    if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMPNS, (char *)&on_off, sizeof(on_off)) < 0)
 #endif
 #ifdef SO_TIMESTAMP
-      if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMP, (char *)&on_off, sizeof(on_off)) < 0)
+  /* Enable receiving of timestamp control messages */
-        LOG(LOGS_ERR, "Could not set %s socket option", "SO_TIMESTAMP");
+  if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMP, (char *)&on_off, sizeof(on_off)) < 0) {
    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set timestamp socket options");
    /* Don't quit - we might survive anyway */
  }
 #endif
      ;
 #ifdef IP_FREEBIND
  /* Allow binding to address that doesn't exist yet */
  if (my_addr_len > 0 &&
      setsockopt(sock_fd, IPPROTO_IP, IP_FREEBIND, (char *)&on_off, sizeof(on_off)) < 0) {
-    LOG(LOGS_ERR, "Could not set %s socket option", "IP_FREEBIND");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set free bind socket option");
  }
 #endif
  if (family == AF_INET) {
-#ifdef HAVE_IN_PKTINFO
+#ifdef IP_PKTINFO
-    if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0)
+    /* We want the local IP info on server sockets */
-      LOG(LOGS_ERR, "Could not set %s socket option", "IP_PKTINFO");
+    if (!client_only &&
-#elif defined(IP_RECVDSTADDR)
+        setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-    if (setsockopt(sock_fd, IPPROTO_IP, IP_RECVDSTADDR, (char *)&on_off, sizeof(on_off)) < 0)
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set packet info socket option");
-      LOG(LOGS_ERR, "Could not set %s socket option", "IP_RECVDSTADDR");
+      /* Don't quit - we might survive anyway */
    }
 #endif
  }
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
  else if (family == AF_INET6) {
 #ifdef IPV6_V6ONLY
    /* Receive IPv6 packets only */
    if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, "Could not set %s socket option", "IPV6_V6ONLY");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPV6_V6ONLY socket option");
    }
 #endif
-#ifdef HAVE_IN6_PKTINFO
+    if (!client_only) {
 #ifdef IPV6_RECVPKTINFO
      if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, "Could not set %s socket option", "IPV6_RECVPKTINFO");
+        LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
      }
-#else
+#elif defined(IPV6_PKTINFO)
      if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, "Could not set %s socket option", "IPV6_PKTINFO");
+        LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
      }
 #endif
-#endif
+    }
  }
 #endif
  /* Bind the socket if a port or address was specified */
-  if (my_addr_len > 0 && PRV_BindSocket(sock_fd, &my_addr.u, my_addr_len) < 0) {
+  if (my_addr_len > 0 && bind(sock_fd, &my_addr.u, my_addr_len) < 0) {
-    LOG(LOGS_ERR, "Could not bind %s NTP socket : %s",
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not bind %s NTP socket : %s",
-        UTI_SockaddrFamilyToString(family), strerror(errno));
+        family == AF_INET ? "IPv4" : "IPv6", strerror(errno));
    close(sock_fd);
    return INVALID_SOCK_FD;
  }
-  /* Register handler for read and possibly exception events on the socket */
+  /* Register handler for read events on the socket */
-  SCH_AddFileHandler(sock_fd, events, read_from_socket, NULL);
+  SCH_AddInputFileHandler(sock_fd, read_from_socket, (void *)(long)sock_fd);
  return sock_fd;
 }
@@ -289,7 +226,7 @@ prepare_separate_client_socket(int family)
  switch (family) {
    case IPADDR_INET4:
      return prepare_socket(AF_INET, 0, 1);
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
    case IPADDR_INET6:
      return prepare_socket(AF_INET6, 0, 1);
 #endif
@@ -306,12 +243,30 @@ connect_socket(int sock_fd, NTP_Remote_Address *remote_addr)
  union sockaddr_in46 addr;
  socklen_t addr_len;
-  addr_len = UTI_IPAndPortToSockaddr(&remote_addr->ip_addr, remote_addr->port, &addr.u);
+  memset(&addr, 0, sizeof (addr));
-  assert(addr_len);
+  switch (remote_addr->ip_addr.family) {
    case IPADDR_INET4:
      addr_len = sizeof (addr.in4);
      addr.in4.sin_family = AF_INET;
      addr.in4.sin_addr.s_addr = htonl(remote_addr->ip_addr.addr.in4);
      addr.in4.sin_port = htons(remote_addr->port);
      break;
 #ifdef HAVE_IPV6
    case IPADDR_INET6:
      addr_len = sizeof (addr.in6);
      addr.in6.sin6_family = AF_INET6;
      memcpy(addr.in6.sin6_addr.s6_addr, remote_addr->ip_addr.addr.in6,
             sizeof (addr.in6.sin6_addr.s6_addr));
      addr.in6.sin6_port = htons(remote_addr->port);
      break;
 #endif
    default:
      assert(0);
  }
  if (connect(sock_fd, &addr.u, addr_len) < 0) {
-    DEBUG_LOG("Could not connect NTP socket to %s:%d : %s",
+    DEBUG_LOG(LOGF_NtpIO, "Could not connect NTP socket to %s:%d : %s",
        UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
        strerror(errno));
    return 0;
@@ -328,41 +283,11 @@ close_socket(int sock_fd)
  if (sock_fd == INVALID_SOCK_FD)
    return;
-#ifdef HAVE_LINUX_TIMESTAMPING
+  SCH_RemoveInputFileHandler(sock_fd);
  NIO_Linux_NotifySocketClosing(sock_fd);
 #endif
  SCH_RemoveFileHandler(sock_fd);
  close(sock_fd);
 }
 /* ================================================== */
 static void
 prepare_buffers(unsigned int n)
 {
  struct MessageHeader *hdr;
  struct Message *msg;
  unsigned int i;
  for (i = 0; i < n; i++) {
    msg = ARR_GetElement(recv_messages, i);
    hdr = ARR_GetElement(recv_headers, i);
    msg->iov.iov_base = &msg->buf;
    msg->iov.iov_len = sizeof (msg->buf);
    hdr->msg_hdr.msg_name = &msg->name;
    hdr->msg_hdr.msg_namelen = sizeof (msg->name);
    hdr->msg_hdr.msg_iov = &msg->iov;
    hdr->msg_hdr.msg_iovlen = 1;
    hdr->msg_hdr.msg_control = &msg->cmsgbuf;
    hdr->msg_hdr.msg_controllen = sizeof (msg->cmsgbuf);
    hdr->msg_hdr.msg_flags = 0;
    hdr->msg_len = 0;
  }
 }
 /* ================================================== */
 void
 NIO_Initialise(int family)
 {
@@ -371,22 +296,6 @@ NIO_Initialise(int family)
  assert(!initialised);
  initialised = 1;
 #ifdef HAVE_LINUX_TIMESTAMPING
  NIO_Linux_Initialise();
 #else
  if (1) {
    CNF_HwTsInterface *conf_iface;
    if (CNF_GetHwTsInterface(0, &conf_iface))
      LOG_FATAL("HW timestamping not supported");
  }
 #endif
  recv_messages = ARR_CreateInstance(sizeof (struct Message));
  ARR_SetSize(recv_messages, MAX_RECV_MESSAGES);
  recv_headers = ARR_CreateInstance(sizeof (struct MessageHeader));
  ARR_SetSize(recv_headers, MAX_RECV_MESSAGES);
  prepare_buffers(MAX_RECV_MESSAGES);
  server_port = CNF_GetNTPPort();
  client_port = CNF_GetAcquisitionPort();
@@ -395,20 +304,15 @@ NIO_Initialise(int family)
  if (client_port < 0)
    client_port = 0;
  permanent_server_sockets = !server_port || (!separate_client_sockets &&
                                              client_port == server_port);
  server_sock_fd4 = INVALID_SOCK_FD;
  client_sock_fd4 = INVALID_SOCK_FD;
-  server_sock_ref4 = 0;
+#ifdef HAVE_IPV6
 #ifdef FEAT_IPV6
  server_sock_fd6 = INVALID_SOCK_FD;
  client_sock_fd6 = INVALID_SOCK_FD;
  server_sock_ref6 = 0;
 #endif
  if (family == IPADDR_UNSPEC || family == IPADDR_INET4) {
-    if (permanent_server_sockets && server_port)
+    if (server_port)
      server_sock_fd4 = prepare_socket(AF_INET, server_port, 0);
    if (!separate_client_sockets) {
      if (client_port != server_port || !server_port)
@@ -417,9 +321,9 @@ NIO_Initialise(int family)
        client_sock_fd4 = server_sock_fd4;
    }
  }
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
  if (family == IPADDR_UNSPEC || family == IPADDR_INET6) {
-    if (permanent_server_sockets && server_port)
+    if (server_port)
      server_sock_fd6 = prepare_socket(AF_INET6, server_port, 0);
    if (!separate_client_sockets) {
      if (client_port != server_port || !server_port)
@@ -430,17 +334,16 @@ NIO_Initialise(int family)
  }
 #endif
-  if ((server_port && server_sock_fd4 == INVALID_SOCK_FD &&
+  if ((server_port && server_sock_fd4 == INVALID_SOCK_FD
-       permanent_server_sockets 
+#ifdef HAVE_IPV6
 #ifdef FEAT_IPV6
       && server_sock_fd6 == INVALID_SOCK_FD
 #endif
      ) || (!separate_client_sockets && client_sock_fd4 == INVALID_SOCK_FD
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
       && client_sock_fd6 == INVALID_SOCK_FD
 #endif
      )) {
-    LOG_FATAL("Could not open NTP sockets");
+    LOG_FATAL(LOGF_NtpIO, "Could not open NTP sockets");
  }
 }
@@ -453,26 +356,19 @@ NIO_Finalise(void)
    close_socket(client_sock_fd4);
  close_socket(server_sock_fd4);
  server_sock_fd4 = client_sock_fd4 = INVALID_SOCK_FD;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
  if (server_sock_fd6 != client_sock_fd6)
    close_socket(client_sock_fd6);
  close_socket(server_sock_fd6);
  server_sock_fd6 = client_sock_fd6 = INVALID_SOCK_FD;
 #endif
  ARR_DestroyInstance(recv_headers);
  ARR_DestroyInstance(recv_messages);
 #ifdef HAVE_LINUX_TIMESTAMPING
  NIO_Linux_Finalise();
 #endif
  initialised = 0;
 }
 /* ================================================== */
 int
-NIO_OpenClientSocket(NTP_Remote_Address *remote_addr)
+NIO_GetClientSocket(NTP_Remote_Address *remote_addr)
 {
  if (separate_client_sockets) {
    int sock_fd = prepare_separate_client_socket(remote_addr->ip_addr.family);
@@ -490,7 +386,7 @@ NIO_OpenClientSocket(NTP_Remote_Address *remote_addr)
    switch (remote_addr->ip_addr.family) {
      case IPADDR_INET4:
        return client_sock_fd4;
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
      case IPADDR_INET6:
        return client_sock_fd6;
 #endif
@@ -503,25 +399,13 @@ NIO_OpenClientSocket(NTP_Remote_Address *remote_addr)
 /* ================================================== */
 int
-NIO_OpenServerSocket(NTP_Remote_Address *remote_addr)
+NIO_GetServerSocket(NTP_Remote_Address *remote_addr)
 {
  switch (remote_addr->ip_addr.family) {
    case IPADDR_INET4:
      if (permanent_server_sockets)
      return server_sock_fd4;
-      if (server_sock_fd4 == INVALID_SOCK_FD)
+#ifdef HAVE_IPV6
        server_sock_fd4 = prepare_socket(AF_INET, CNF_GetNTPPort(), 0);
      if (server_sock_fd4 != INVALID_SOCK_FD)
        server_sock_ref4++;
      return server_sock_fd4;
 #ifdef FEAT_IPV6
    case IPADDR_INET6:
      if (permanent_server_sockets)
        return server_sock_fd6;
      if (server_sock_fd6 == INVALID_SOCK_FD)
        server_sock_fd6 = prepare_socket(AF_INET6, CNF_GetNTPPort(), 0);
      if (server_sock_fd6 != INVALID_SOCK_FD)
        server_sock_ref6++;
      return server_sock_fd6;
 #endif
    default:
@@ -540,39 +424,12 @@ NIO_CloseClientSocket(int sock_fd)
 /* ================================================== */
 void
 NIO_CloseServerSocket(int sock_fd)
 {
  if (permanent_server_sockets || sock_fd == INVALID_SOCK_FD)
    return;
  if (sock_fd == server_sock_fd4) {
    if (--server_sock_ref4 <= 0) {
      close_socket(server_sock_fd4);
      server_sock_fd4 = INVALID_SOCK_FD;
    }
  }
 #ifdef FEAT_IPV6
  else if (sock_fd == server_sock_fd6) {
    if (--server_sock_ref6 <= 0) {
      close_socket(server_sock_fd6);
      server_sock_fd6 = INVALID_SOCK_FD;
    }
  }
 #endif
  else {
    assert(0);
  }
 }
 /* ================================================== */
 int
 NIO_IsServerSocket(int sock_fd)
 {
  return sock_fd != INVALID_SOCK_FD &&
    (sock_fd == server_sock_fd4
-#ifdef FEAT_IPV6
+#ifdef HAVE_IPV6
     || sock_fd == server_sock_fd6
 #endif
    );
@@ -580,85 +437,86 @@ NIO_IsServerSocket(int sock_fd)
 /* ================================================== */
 int
 NIO_IsServerConnectable(NTP_Remote_Address *remote_addr)
 {
  int sock_fd, r;
  sock_fd = prepare_separate_client_socket(remote_addr->ip_addr.family);
  if (sock_fd == INVALID_SOCK_FD)
    return 0;
  r = connect_socket(sock_fd, remote_addr);
  close_socket(sock_fd);
  return r;
 }
 /* ================================================== */
 static void
-process_message(struct msghdr *hdr, int length, int sock_fd)
+read_from_socket(void *anything)
 {
  /* This should only be called when there is something
     to read, otherwise it will block. */
  int status, sock_fd;
  ReceiveBuffer message;
  union sockaddr_in46 where_from;
  unsigned int flags = 0;
  struct timeval now;
  double now_err;
  NTP_Remote_Address remote_addr;
  NTP_Local_Address local_addr;
-  NTP_Local_Timestamp local_ts;
+  char cmsgbuf[256];
-  struct timespec sched_ts;
+  struct msghdr msg;
  struct iovec iov;
  struct cmsghdr *cmsg;
-  SCH_GetLastEventTime(&local_ts.ts, &local_ts.err, NULL);
+  assert(initialised);
  local_ts.source = NTP_TS_DAEMON;
  sched_ts = local_ts.ts;
-  if (hdr->msg_namelen > sizeof (union sockaddr_in46)) {
+  SCH_GetLastEventTime(&now, &now_err, NULL);
    DEBUG_LOG("Truncated source address");
    return;
  }
-  if (hdr->msg_namelen >= sizeof (((struct sockaddr *)hdr->msg_name)->sa_family)) {
+  iov.iov_base = message.arbitrary;
-    UTI_SockaddrToIPAndPort((struct sockaddr *)hdr->msg_name,
+  iov.iov_len = sizeof(message);
-                            &remote_addr.ip_addr, &remote_addr.port);
+  msg.msg_name = &where_from;
-  } else {
+  msg.msg_namelen = sizeof(where_from);
-    remote_addr.ip_addr.family = IPADDR_UNSPEC;
+  msg.msg_iov = &iov;
-    remote_addr.port = 0;
+  msg.msg_iovlen = 1;
  msg.msg_control = (void *) cmsgbuf;
  msg.msg_controllen = sizeof(cmsgbuf);
  msg.msg_flags = 0;
  sock_fd = (long)anything;
  status = recvmsg(sock_fd, &msg, flags);
  /* Don't bother checking if read failed or why if it did.  More
     likely than not, it will be connection refused, resulting from a
     previous sendto() directing a datagram at a port that is not
     listening (which appears to generate an ICMP response, and on
     some architectures e.g. Linux this is translated into an error
     reponse on a subsequent recvfrom). */
  if (status > 0) {
    if (msg.msg_namelen > sizeof (where_from))
      LOG_FATAL(LOGF_NtpIO, "Truncated source address");
    switch (where_from.u.sa_family) {
      case AF_INET:
        remote_addr.ip_addr.family = IPADDR_INET4;
        remote_addr.ip_addr.addr.in4 = ntohl(where_from.in4.sin_addr.s_addr);
        remote_addr.port = ntohs(where_from.in4.sin_port);
        break;
 #ifdef HAVE_IPV6
      case AF_INET6:
        remote_addr.ip_addr.family = IPADDR_INET6;
        memcpy(&remote_addr.ip_addr.addr.in6, where_from.in6.sin6_addr.s6_addr,
            sizeof (remote_addr.ip_addr.addr.in6));
        remote_addr.port = ntohs(where_from.in6.sin6_port);
        break;
 #endif
      default:
        assert(0);
    }
    local_addr.ip_addr.family = IPADDR_UNSPEC;
  local_addr.if_index = INVALID_IF_INDEX;
    local_addr.sock_fd = sock_fd;
-  if (hdr->msg_flags & MSG_TRUNC) {
+    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-    DEBUG_LOG("Received truncated message from %s:%d",
+#ifdef IP_PKTINFO
              UTI_IPToString(&remote_addr.ip_addr), remote_addr.port);
    return;
  }
  if (hdr->msg_flags & MSG_CTRUNC) {
    DEBUG_LOG("Truncated control message");
    /* Continue */
  }
  for (cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
 #ifdef HAVE_IN_PKTINFO
      if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO) {
        struct in_pktinfo ipi;
        memcpy(&ipi, CMSG_DATA(cmsg), sizeof(ipi));
-      local_addr.ip_addr.addr.in4 = ntohl(ipi.ipi_addr.s_addr);
+        local_addr.ip_addr.addr.in4 = ntohl(ipi.ipi_spec_dst.s_addr);
      local_addr.ip_addr.family = IPADDR_INET4;
      local_addr.if_index = ipi.ipi_ifindex;
    }
 #elif defined(IP_RECVDSTADDR)
    if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_RECVDSTADDR) {
      struct in_addr addr;
      memcpy(&addr, CMSG_DATA(cmsg), sizeof (addr));
      local_addr.ip_addr.addr.in4 = ntohl(addr.s_addr);
        local_addr.ip_addr.family = IPADDR_INET4;
      }
 #endif
-#ifdef HAVE_IN6_PKTINFO
+#if defined(IPV6_PKTINFO) && defined(HAVE_IN6_PKTINFO)
      if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
        struct in6_pktinfo ipi;
@@ -666,147 +524,85 @@ process_message(struct msghdr *hdr, int length, int sock_fd)
        memcpy(&local_addr.ip_addr.addr.in6, &ipi.ipi6_addr.s6_addr,
            sizeof (local_addr.ip_addr.addr.in6));
        local_addr.ip_addr.family = IPADDR_INET6;
      local_addr.if_index = ipi.ipi6_ifindex;
      }
 #endif
-#ifdef SCM_TIMESTAMP
+#ifdef SO_TIMESTAMP
-    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMP) {
+      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP) {
        struct timeval tv;
      struct timespec ts;
        memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));
-      UTI_TimevalToTimespec(&tv, &ts);
+        LCL_CookTime(&tv, &now, &now_err);
      LCL_CookTime(&ts, &local_ts.ts, &local_ts.err);
      local_ts.source = NTP_TS_KERNEL;
    }
 #endif
 #ifdef SCM_TIMESTAMPNS
    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMPNS) {
      struct timespec ts;
      memcpy(&ts, CMSG_DATA(cmsg), sizeof (ts));
      LCL_CookTime(&ts, &local_ts.ts, &local_ts.err);
      local_ts.source = NTP_TS_KERNEL;
      }
 #endif
    }
-#ifdef HAVE_LINUX_TIMESTAMPING
+    if (status > 0) {
-  if (NIO_Linux_ProcessMessage(&remote_addr, &local_addr, &local_ts, hdr, length))
+      DEBUG_LOG(LOGF_NtpIO, "Received %d bytes from %s:%d to %s fd %d",
-    return;
+          status,
-#endif
+          UTI_IPToString(&remote_addr.ip_addr), remote_addr.port,
          UTI_IPToString(&local_addr.ip_addr), local_addr.sock_fd);
    }
-  DEBUG_LOG("Received %d bytes from %s:%d to %s fd=%d if=%d tss=%u delay=%.9f",
+    if (status >= NTP_NORMAL_PACKET_SIZE && status <= sizeof(NTP_Packet)) {
-            length, UTI_IPToString(&remote_addr.ip_addr), remote_addr.port,
+
-            UTI_IPToString(&local_addr.ip_addr), local_addr.sock_fd, local_addr.if_index,
+      NSR_ProcessReceive((NTP_Packet *) &message.ntp_pkt, &now, now_err,
-            local_ts.source, UTI_DiffTimespecsToDouble(&sched_ts, &local_ts.ts));
+                         &remote_addr, &local_addr, status);
    } else {
      /* Just ignore the packet if it's not of a recognized length */
  if (length < NTP_NORMAL_PACKET_LENGTH || length > sizeof (NTP_Receive_Buffer))
    return;
-  NSR_ProcessRx(&remote_addr, &local_addr, &local_ts,
+    }
-                (NTP_Packet *)hdr->msg_iov[0].iov_base, length);
+  }
 }
 /* ================================================== */
 /* Send a packet to given address */
-static void
+static int
-read_from_socket(int sock_fd, int event, void *anything)
+send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)
 {
  /* This should only be called when there is something
     to read, otherwise it may block */
  struct MessageHeader *hdr;
  unsigned int i, n;
  int status, flags = 0;
 #ifdef HAVE_LINUX_TIMESTAMPING
  if (NIO_Linux_ProcessEvent(sock_fd, event))
    return;
 #endif
  hdr = ARR_GetElements(recv_headers);
  n = ARR_GetSize(recv_headers);
  assert(n >= 1);
  if (event == SCH_FILE_EXCEPTION) {
 #ifdef HAVE_LINUX_TIMESTAMPING
    flags |= MSG_ERRQUEUE;
 #else
    assert(0);
 #endif
  }
 #ifdef HAVE_RECVMMSG
  status = recvmmsg(sock_fd, hdr, n, flags | MSG_DONTWAIT, NULL);
  if (status >= 0)
    n = status;
 #else
  n = 1;
  status = recvmsg(sock_fd, &hdr[0].msg_hdr, flags);
  if (status >= 0)
    hdr[0].msg_len = status;
 #endif
  if (status < 0) {
 #ifdef HAVE_LINUX_TIMESTAMPING
    /* If reading from the error queue failed, the exception should be
       for a socket error.  Clear the error to avoid a busy loop. */
    if (flags & MSG_ERRQUEUE) {
      int error = 0;
      socklen_t len = sizeof (error);
      if (getsockopt(sock_fd, SOL_SOCKET, SO_ERROR, &error, &len))
        DEBUG_LOG("Could not get SO_ERROR");
      if (error)
        errno = error;
    }
 #endif
    DEBUG_LOG("Could not receive from fd %d : %s", sock_fd,
              strerror(errno));
    return;
  }
  for (i = 0; i < n; i++) {
    hdr = ARR_GetElement(recv_headers, i);
    process_message(&hdr->msg_hdr, hdr->msg_len, sock_fd);
  }
  /* Restore the buffers to their original state */
  prepare_buffers(n);
 }
 /* ================================================== */
 /* Send a packet to remote address from local address */
 int
 NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
               NTP_Local_Address *local_addr, int length, int process_tx)
 {
  union sockaddr_in46 remote;
  struct msghdr msg;
  struct iovec iov;
-  struct cmsghdr *cmsg, cmsgbuf[CMSGBUF_SIZE / sizeof (struct cmsghdr)];
+  char cmsgbuf[256];
  int cmsglen;
  socklen_t addrlen = 0;
  assert(initialised);
  if (local_addr->sock_fd == INVALID_SOCK_FD) {
-    DEBUG_LOG("No socket to send to %s:%d",
+    DEBUG_LOG(LOGF_NtpIO, "No socket to send to %s:%d",
              UTI_IPToString(&remote_addr->ip_addr), remote_addr->port);
    return 0;
  }
  switch (remote_addr->ip_addr.family) {
    case IPADDR_INET4:
      /* Don't set address with connected socket */
-  if (NIO_IsServerSocket(local_addr->sock_fd) || !separate_client_sockets) {
+      if (local_addr->sock_fd != server_sock_fd4 && separate_client_sockets)
-    addrlen = UTI_IPAndPortToSockaddr(&remote_addr->ip_addr, remote_addr->port,
+        break;
-                                      &remote.u);
+      memset(&remote.in4, 0, sizeof (remote.in4));
-    if (!addrlen)
+      addrlen = sizeof (remote.in4);
      remote.in4.sin_family = AF_INET;
      remote.in4.sin_port = htons(remote_addr->port);
      remote.in4.sin_addr.s_addr = htonl(remote_addr->ip_addr.addr.in4);
      break;
 #ifdef HAVE_IPV6
    case IPADDR_INET6:
      /* Don't set address with connected socket */
      if (local_addr->sock_fd != server_sock_fd6 && separate_client_sockets)
        break;
      memset(&remote.in6, 0, sizeof (remote.in6));
      addrlen = sizeof (remote.in6);
      remote.in6.sin6_family = AF_INET6;
      remote.in6.sin6_port = htons(remote_addr->port);
      memcpy(&remote.in6.sin6_addr.s6_addr, &remote_addr->ip_addr.addr.in6,
          sizeof (remote.in6.sin6_addr.s6_addr));
      break;
 #endif
    default:
      return 0;
  }
@@ -819,7 +615,7 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
  }
  iov.iov_base = packet;
-  iov.iov_len = length;
+  iov.iov_len = packetlen;
  msg.msg_iov = &iov;
  msg.msg_iovlen = 1;
  msg.msg_control = cmsgbuf;
@@ -827,8 +623,9 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
  msg.msg_flags = 0;
  cmsglen = 0;
-#ifdef HAVE_IN_PKTINFO
+#ifdef IP_PKTINFO
  if (local_addr->ip_addr.family == IPADDR_INET4) {
    struct cmsghdr *cmsg;
    struct in_pktinfo *ipi;
    cmsg = CMSG_FIRSTHDR(&msg);
@@ -841,30 +638,12 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
    ipi = (struct in_pktinfo *) CMSG_DATA(cmsg);
    ipi->ipi_spec_dst.s_addr = htonl(local_addr->ip_addr.addr.in4);
    if (local_addr->if_index != INVALID_IF_INDEX)
      ipi->ipi_ifindex = local_addr->if_index;
  }
 #elif defined(IP_SENDSRCADDR)
  /* Specify the IPv4 source address only if the socket is not bound */
  if (local_addr->ip_addr.family == IPADDR_INET4 &&
      local_addr->sock_fd == server_sock_fd4 && !bound_server_sock_fd4) {
    struct in_addr *addr;
    cmsg = CMSG_FIRSTHDR(&msg);
    memset(cmsg, 0, CMSG_SPACE(sizeof (struct in_addr)));
    cmsglen += CMSG_SPACE(sizeof (struct in_addr));
    cmsg->cmsg_level = IPPROTO_IP;
    cmsg->cmsg_type = IP_SENDSRCADDR;
    cmsg->cmsg_len = CMSG_LEN(sizeof (struct in_addr));
    addr = (struct in_addr *)CMSG_DATA(cmsg);
    addr->s_addr = htonl(local_addr->ip_addr.addr.in4);
  }
 #endif
-#ifdef HAVE_IN6_PKTINFO
+#if defined(IPV6_PKTINFO) && defined(HAVE_IN6_PKTINFO)
  if (local_addr->ip_addr.family == IPADDR_INET6) {
    struct cmsghdr *cmsg;
    struct in6_pktinfo *ipi;
    cmsg = CMSG_FIRSTHDR(&msg);
@@ -878,32 +657,43 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
    ipi = (struct in6_pktinfo *) CMSG_DATA(cmsg);
    memcpy(&ipi->ipi6_addr.s6_addr, &local_addr->ip_addr.addr.in6,
        sizeof(ipi->ipi6_addr.s6_addr));
    if (local_addr->if_index != INVALID_IF_INDEX)
      ipi->ipi6_ifindex = local_addr->if_index;
  }
 #endif
 #ifdef HAVE_LINUX_TIMESTAMPING
  if (process_tx)
   cmsglen = NIO_Linux_RequestTxTimestamp(&msg, cmsglen, local_addr->sock_fd);
 #endif
  msg.msg_controllen = cmsglen;
  /* This is apparently required on some systems */
  if (!cmsglen)
    msg.msg_control = NULL;
  if (sendmsg(local_addr->sock_fd, &msg, 0) < 0) {
-    DEBUG_LOG("Could not send to %s:%d from %s fd %d : %s",
+    DEBUG_LOG(LOGF_NtpIO, "Could not send to %s:%d from %s fd %d : %s",
        UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
        UTI_IPToString(&local_addr->ip_addr), local_addr->sock_fd,
        strerror(errno));
    return 0;
  }
-  DEBUG_LOG("Sent %d bytes to %s:%d from %s fd %d", length,
+  DEBUG_LOG(LOGF_NtpIO, "Sent to %s:%d from %s fd %d",
      UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
      UTI_IPToString(&local_addr->ip_addr), local_addr->sock_fd);
  return 1;
 }
 /* ================================================== */
 /* Send an unauthenticated packet to a given address */
 int
 NIO_SendNormalPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)
 {
  return send_packet((void *) packet, NTP_NORMAL_PACKET_SIZE, remote_addr, local_addr);
 }
 /* ================================================== */
 /* Send an authenticated packet to a given address */
 int
 NIO_SendAuthenticatedPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int auth_len)
 {
  return send_packet((void *) packet, NTP_NORMAL_PACKET_SIZE + auth_len, remote_addr, local_addr);
 }
--- a/ntp_io.h
+++ b/ntp_io.h
@@ -39,25 +39,21 @@ extern void NIO_Initialise(int family);
 extern void NIO_Finalise(void);
 /* Function to obtain a socket for sending client packets */
-extern int NIO_OpenClientSocket(NTP_Remote_Address *remote_addr);
+extern int NIO_GetClientSocket(NTP_Remote_Address *remote_addr);
 /* Function to obtain a socket for sending server/peer packets */
-extern int NIO_OpenServerSocket(NTP_Remote_Address *remote_addr);
+extern int NIO_GetServerSocket(NTP_Remote_Address *remote_addr);
-/* Function to close a socket returned by NIO_OpenClientSocket() */
+/* Function to close a socket returned by NIO_GetClientSocket() */
 extern void NIO_CloseClientSocket(int sock_fd);
 /* Function to close a socket returned by NIO_OpenServerSocket() */
 extern void NIO_CloseServerSocket(int sock_fd);
 /* Function to check if socket is a server socket */
 extern int NIO_IsServerSocket(int sock_fd);
 /* Function to check if client packets can be sent to a server */
 extern int NIO_IsServerConnectable(NTP_Remote_Address *remote_addr);
 /* Function to transmit a packet */
-extern int NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
+extern int NIO_SendNormalPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr);
-                          NTP_Local_Address *local_addr, int length, int process_tx);
+
 /* Function to transmit an authenticated packet */
 extern int NIO_SendAuthenticatedPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int auth_len);
 #endif /* GOT_NTP_IO_H */
--- a/ntp_io_linux.c
+++ b/ntp_io_linux.c
@@ -1,883 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016-2019
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Functions for NTP I/O specific to Linux
  */
 #include "config.h"
 #include "sysincl.h"
 #include <ifaddrs.h>
 #include <linux/errqueue.h>
 #include <linux/ethtool.h>
 #include <linux/net_tstamp.h>
 #include <linux/sockios.h>
 #include <net/if.h>
 #include "array.h"
 #include "conf.h"
 #include "hwclock.h"
 #include "local.h"
 #include "logging.h"
 #include "ntp_core.h"
 #include "ntp_io.h"
 #include "ntp_io_linux.h"
 #include "ntp_sources.h"
 #include "sched.h"
 #include "sys_linux.h"
 #include "util.h"
 union sockaddr_in46 {
  struct sockaddr_in in4;
 #ifdef FEAT_IPV6
  struct sockaddr_in6 in6;
 #endif
  struct sockaddr u;
 };
 struct Interface {
  char name[IF_NAMESIZE];
  int if_index;
  int phc_fd;
  int phc_mode;
  int phc_nocrossts;
  /* Link speed in mbit/s */
  int link_speed;
  /* Start of UDP data at layer 2 for IPv4 and IPv6 */
  int l2_udp4_ntp_start;
  int l2_udp6_ntp_start;
  /* Precision of PHC readings */
  double precision;
  /* Compensation of errors in TX and RX timestamping */
  double tx_comp;
  double rx_comp;
  HCL_Instance clock;
 };
 /* Number of PHC readings per HW clock sample */
 #define PHC_READINGS 10
 /* Minimum interval between PHC readings */
 #define MIN_PHC_POLL -6
 /* Maximum acceptable offset between HW and daemon/kernel timestamp */
 #define MAX_TS_DELAY 1.0
 /* Array of Interfaces */
 static ARR_Instance interfaces;
 /* RX/TX and TX-specific timestamping socket options */
 static int ts_flags;
 static int ts_tx_flags;
 /* Flag indicating the socket options can't be changed in control messages */
 static int permanent_ts_options;
 /* When sending client requests to a close and fast server, it is possible that
   a response will be received before the HW transmit timestamp of the request
   itself.  To avoid processing of the response without the HW timestamp, we
   monitor events returned by select() and suspend reading of packets from the
   receive queue for up to 200 microseconds.  As the requests are normally
   separated by at least 200 milliseconds, it is sufficient to monitor and
   suspend one socket at a time. */
 static int monitored_socket;
 static int suspended_socket;
 static SCH_TimeoutID resume_timeout_id;
 #define RESUME_TIMEOUT 200.0e-6
 /* Unbound socket keeping the kernel RX timestamping permanently enabled
   in order to avoid a race condition between receiving a server response
   and the kernel actually starting to timestamp received packets after
   enabling the timestamping and sending a request */
 static int dummy_rxts_socket;
 #define INVALID_SOCK_FD -3
 /* ================================================== */
 static int
 add_interface(CNF_HwTsInterface *conf_iface)
 {
  struct ethtool_ts_info ts_info;
  struct hwtstamp_config ts_config;
  struct ifreq req;
  int sock_fd, if_index, phc_fd, req_hwts_flags, rx_filter;
  unsigned int i;
  struct Interface *iface;
  /* Check if the interface was not already added */
  for (i = 0; i < ARR_GetSize(interfaces); i++) {
    if (!strcmp(conf_iface->name, ((struct Interface *)ARR_GetElement(interfaces, i))->name))
      return 1;
  }
  sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sock_fd < 0)
    return 0;
  memset(&req, 0, sizeof (req));
  memset(&ts_info, 0, sizeof (ts_info));
  if (snprintf(req.ifr_name, sizeof (req.ifr_name), "%s", conf_iface->name) >=
      sizeof (req.ifr_name)) {
    close(sock_fd);
    return 0;
  }
  if (ioctl(sock_fd, SIOCGIFINDEX, &req)) {
    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCGIFINDEX", strerror(errno));
    close(sock_fd);
    return 0;
  }
  if_index = req.ifr_ifindex;
  ts_info.cmd = ETHTOOL_GET_TS_INFO;
  req.ifr_data = (char *)&ts_info;
  if (ioctl(sock_fd, SIOCETHTOOL, &req)) {
    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
    close(sock_fd);
    return 0;
  }
  req_hwts_flags = SOF_TIMESTAMPING_RX_HARDWARE | SOF_TIMESTAMPING_TX_HARDWARE |
                   SOF_TIMESTAMPING_RAW_HARDWARE;
  if ((ts_info.so_timestamping & req_hwts_flags) != req_hwts_flags) {
    DEBUG_LOG("HW timestamping not supported on %s", req.ifr_name);
    close(sock_fd);
    return 0;
  }
  if (ts_info.phc_index < 0) {
    DEBUG_LOG("PHC missing on %s", req.ifr_name);
    close(sock_fd);
    return 0;
  }
  switch (conf_iface->rxfilter) {
    case CNF_HWTS_RXFILTER_ANY:
 #ifdef HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP
      if (ts_info.rx_filters & (1 << HWTSTAMP_FILTER_NTP_ALL))
        rx_filter = HWTSTAMP_FILTER_NTP_ALL;
      else
 #endif
      if (ts_info.rx_filters & (1 << HWTSTAMP_FILTER_ALL))
        rx_filter = HWTSTAMP_FILTER_ALL;
      else
        rx_filter = HWTSTAMP_FILTER_NONE;
      break;
    case CNF_HWTS_RXFILTER_NONE:
      rx_filter = HWTSTAMP_FILTER_NONE;
      break;
 #ifdef HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP
    case CNF_HWTS_RXFILTER_NTP:
      rx_filter = HWTSTAMP_FILTER_NTP_ALL;
      break;
 #endif
    default:
      rx_filter = HWTSTAMP_FILTER_ALL;
      break;
  }
  ts_config.flags = 0;
  ts_config.tx_type = HWTSTAMP_TX_ON;
  ts_config.rx_filter = rx_filter;
  req.ifr_data = (char *)&ts_config;
  if (ioctl(sock_fd, SIOCSHWTSTAMP, &req)) {
    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
    /* Check the current timestamping configuration in case this interface
       allows only reading of the configuration and it was already configured
       as requested */
    req.ifr_data = (char *)&ts_config;
 #ifdef SIOCGHWTSTAMP
    if (ioctl(sock_fd, SIOCGHWTSTAMP, &req) ||
        ts_config.tx_type != HWTSTAMP_TX_ON || ts_config.rx_filter != rx_filter)
 #endif
    {
      close(sock_fd);
      return 0;
    }
  }
  close(sock_fd);
  phc_fd = SYS_Linux_OpenPHC(NULL, ts_info.phc_index);
  if (phc_fd < 0)
    return 0;
  iface = ARR_GetNewElement(interfaces);
  snprintf(iface->name, sizeof (iface->name), "%s", conf_iface->name);
  iface->if_index = if_index;
  iface->phc_fd = phc_fd;
  iface->phc_mode = 0;
  iface->phc_nocrossts = conf_iface->nocrossts;
  /* Start with 1 gbit and no VLANs or IPv4/IPv6 options */
  iface->link_speed = 1000;
  iface->l2_udp4_ntp_start = 42;
  iface->l2_udp6_ntp_start = 62;
  iface->precision = conf_iface->precision;
  iface->tx_comp = conf_iface->tx_comp;
  iface->rx_comp = conf_iface->rx_comp;
  iface->clock = HCL_CreateInstance(conf_iface->min_samples, conf_iface->max_samples,
                                    UTI_Log2ToDouble(MAX(conf_iface->minpoll, MIN_PHC_POLL)));
  LOG(LOGS_INFO, "Enabled HW timestamping %son %s",
      ts_config.rx_filter == HWTSTAMP_FILTER_NONE ? "(TX only) " : "", iface->name);
  return 1;
 }
 /* ================================================== */
 static int
 add_all_interfaces(CNF_HwTsInterface *conf_iface_all)
 {
  CNF_HwTsInterface conf_iface;
  struct ifaddrs *ifaddr, *ifa;
  int r;
  conf_iface = *conf_iface_all;
  if (getifaddrs(&ifaddr)) {
    DEBUG_LOG("getifaddrs() failed : %s", strerror(errno));
    return 0;
  }
  for (r = 0, ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
    conf_iface.name = ifa->ifa_name;
    if (add_interface(&conf_iface))
      r = 1;
  }
  freeifaddrs(ifaddr);
  /* Return success if at least one interface was added */
  return r;
 }
 /* ================================================== */
 static void
 update_interface_speed(struct Interface *iface)
 {
  struct ethtool_cmd cmd;
  struct ifreq req;
  int sock_fd, link_speed;
  sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sock_fd < 0)
    return;
  memset(&req, 0, sizeof (req));
  memset(&cmd, 0, sizeof (cmd));
  snprintf(req.ifr_name, sizeof (req.ifr_name), "%s", iface->name);
  cmd.cmd = ETHTOOL_GSET;
  req.ifr_data = (char *)&cmd;
  if (ioctl(sock_fd, SIOCETHTOOL, &req)) {
    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
    close(sock_fd);
    return;
  }
  close(sock_fd);
  link_speed = ethtool_cmd_speed(&cmd);
  if (iface->link_speed != link_speed) {
    iface->link_speed = link_speed;
    DEBUG_LOG("Updated speed of %s to %d Mb/s", iface->name, link_speed);
  }
 }
 /* ================================================== */
 #if defined(HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO) || defined(HAVE_LINUX_TIMESTAMPING_OPT_TX_SWHW)
 static int
 check_timestamping_option(int option)
 {
  int sock_fd;
  sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sock_fd < 0)
    return 0;
  if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMPING, &option, sizeof (option)) < 0) {
    DEBUG_LOG("Could not enable timestamping option %x", (unsigned int)option);
    close(sock_fd);
    return 0;
  }
  close(sock_fd);
  return 1;
 }
 #endif
 /* ================================================== */
 static int
 open_dummy_socket(void)
 {
  int sock_fd, events = 0;
  if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0
 #ifdef FEAT_IPV6
      && (sock_fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0
 #endif
     )
    return INVALID_SOCK_FD;
  if (!NIO_Linux_SetTimestampSocketOptions(sock_fd, 1, &events)) {
    close(sock_fd);
    return INVALID_SOCK_FD;
  }
  UTI_FdSetCloexec(sock_fd);
  return sock_fd;
 }
 /* ================================================== */
 void
 NIO_Linux_Initialise(void)
 {
  CNF_HwTsInterface *conf_iface;
  unsigned int i;
  int hwts;
  interfaces = ARR_CreateInstance(sizeof (struct Interface));
  /* Enable HW timestamping on specified interfaces.  If "*" was specified, try
     all interfaces.  If no interface was specified, enable SW timestamping. */
  for (i = hwts = 0; CNF_GetHwTsInterface(i, &conf_iface); i++) {
    if (!strcmp("*", conf_iface->name))
      continue;
    if (!add_interface(conf_iface))
      LOG_FATAL("Could not enable HW timestamping on %s", conf_iface->name);
    hwts = 1;
  }
  for (i = 0; CNF_GetHwTsInterface(i, &conf_iface); i++) {
    if (strcmp("*", conf_iface->name))
      continue;
    if (add_all_interfaces(conf_iface))
      hwts = 1;
    break;
  }
  ts_flags = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE;
  ts_tx_flags = SOF_TIMESTAMPING_TX_SOFTWARE;
  if (hwts) {
    ts_flags |= SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_RX_HARDWARE;
    ts_tx_flags |= SOF_TIMESTAMPING_TX_HARDWARE;
 #ifdef HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO
    if (check_timestamping_option(SOF_TIMESTAMPING_OPT_PKTINFO))
      ts_flags |= SOF_TIMESTAMPING_OPT_PKTINFO;
 #endif
 #ifdef HAVE_LINUX_TIMESTAMPING_OPT_TX_SWHW
    if (check_timestamping_option(SOF_TIMESTAMPING_OPT_TX_SWHW))
      ts_flags |= SOF_TIMESTAMPING_OPT_TX_SWHW;
 #endif
  }
  /* Enable IP_PKTINFO in messages looped back to the error queue */
  ts_flags |= SOF_TIMESTAMPING_OPT_CMSG;
  /* Kernels before 4.7 ignore timestamping flags set in control messages */
  permanent_ts_options = !SYS_Linux_CheckKernelVersion(4, 7);
  monitored_socket = INVALID_SOCK_FD;
  suspended_socket = INVALID_SOCK_FD;
  dummy_rxts_socket = INVALID_SOCK_FD;
 }
 /* ================================================== */
 void
 NIO_Linux_Finalise(void)
 {
  struct Interface *iface;
  unsigned int i;
  if (dummy_rxts_socket != INVALID_SOCK_FD)
    close(dummy_rxts_socket);
  for (i = 0; i < ARR_GetSize(interfaces); i++) {
    iface = ARR_GetElement(interfaces, i);
    HCL_DestroyInstance(iface->clock);
    close(iface->phc_fd);
  }
  ARR_DestroyInstance(interfaces);
 }
 /* ================================================== */
 int
 NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events)
 {
  int val, flags;
  if (!ts_flags)
    return 0;
  /* Enable SCM_TIMESTAMPING control messages and the socket's error queue in
     order to receive our transmitted packets with more accurate timestamps */
  val = 1;
  flags = ts_flags;
  if (client_only || permanent_ts_options)
    flags |= ts_tx_flags;
  if (setsockopt(sock_fd, SOL_SOCKET, SO_SELECT_ERR_QUEUE, &val, sizeof (val)) < 0) {
    LOG(LOGS_ERR, "Could not set %s socket option", "SO_SELECT_ERR_QUEUE");
    ts_flags = 0;
    return 0;
  }
  if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMPING, &flags, sizeof (flags)) < 0) {
    LOG(LOGS_ERR, "Could not set %s socket option", "SO_TIMESTAMPING");
    ts_flags = 0;
    return 0;
  }
  *events |= SCH_FILE_EXCEPTION;
  return 1;
 }
 /* ================================================== */
 static void
 resume_socket(int sock_fd)
 {
  if (monitored_socket == sock_fd)
    monitored_socket = INVALID_SOCK_FD;
  if (sock_fd == INVALID_SOCK_FD || sock_fd != suspended_socket)
    return;
  suspended_socket = INVALID_SOCK_FD;
  SCH_SetFileHandlerEvent(sock_fd, SCH_FILE_INPUT, 1);
  DEBUG_LOG("Resumed RX processing %s timeout fd=%d",
            resume_timeout_id ? "before" : "on", sock_fd);
  if (resume_timeout_id) {
    SCH_RemoveTimeout(resume_timeout_id);
    resume_timeout_id = 0;
  }
 }
 /* ================================================== */
 static void
 resume_timeout(void *arg)
 {
  resume_timeout_id = 0;
  resume_socket(suspended_socket);
 }
 /* ================================================== */
 static void
 suspend_socket(int sock_fd)
 {
  resume_socket(suspended_socket);
  suspended_socket = sock_fd;
  SCH_SetFileHandlerEvent(suspended_socket, SCH_FILE_INPUT, 0);
  resume_timeout_id = SCH_AddTimeoutByDelay(RESUME_TIMEOUT, resume_timeout, NULL);
  DEBUG_LOG("Suspended RX processing fd=%d", sock_fd);
 }
 /* ================================================== */
 int
 NIO_Linux_ProcessEvent(int sock_fd, int event)
 {
  if (sock_fd != monitored_socket)
    return 0;
  if (event == SCH_FILE_INPUT) {
    suspend_socket(monitored_socket);
    monitored_socket = INVALID_SOCK_FD;
    /* Don't process the message yet */
    return 1;
  }
  return 0;
 }
 /* ================================================== */
 static struct Interface *
 get_interface(int if_index)
 {
  struct Interface *iface;
  unsigned int i;
  for (i = 0; i < ARR_GetSize(interfaces); i++) {
    iface = ARR_GetElement(interfaces, i);
    if (iface->if_index != if_index)
      continue;
    return iface;
  }
  return NULL;
 }
 /* ================================================== */
 static void
 process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
                     NTP_Local_Timestamp *local_ts, int rx_ntp_length, int family,
                     int l2_length)
 {
  struct timespec sample_phc_ts, sample_sys_ts, sample_local_ts, ts;
  double rx_correction, ts_delay, phc_err, local_err;
  if (HCL_NeedsNewSample(iface->clock, &local_ts->ts)) {
    if (!SYS_Linux_GetPHCSample(iface->phc_fd, iface->phc_nocrossts, iface->precision,
                                &iface->phc_mode, &sample_phc_ts, &sample_sys_ts,
                                &phc_err))
      return;
    LCL_CookTime(&sample_sys_ts, &sample_local_ts, &local_err);
    HCL_AccumulateSample(iface->clock, &sample_phc_ts, &sample_local_ts,
                         phc_err + local_err);
    update_interface_speed(iface);
  }
  /* We need to transpose RX timestamps as hardware timestamps are normally
     preamble timestamps and RX timestamps in NTP are supposed to be trailer
     timestamps.  If we don't know the length of the packet at layer 2, we
     make an assumption that UDP data start at the same position as in the
     last transmitted packet which had a HW TX timestamp. */
  if (rx_ntp_length && iface->link_speed) {
    if (!l2_length)
      l2_length = (family == IPADDR_INET4 ? iface->l2_udp4_ntp_start :
                   iface->l2_udp6_ntp_start) + rx_ntp_length;
    /* Include the frame check sequence (FCS) */
    l2_length += 4;
    rx_correction = l2_length / (1.0e6 / 8 * iface->link_speed);
    UTI_AddDoubleToTimespec(hw_ts, rx_correction, hw_ts);
  }
  if (!HCL_CookTime(iface->clock, hw_ts, &ts, &local_err))
    return;
  if (!rx_ntp_length && iface->tx_comp)
    UTI_AddDoubleToTimespec(&ts, iface->tx_comp, &ts);
  else if (rx_ntp_length && iface->rx_comp)
    UTI_AddDoubleToTimespec(&ts, -iface->rx_comp, &ts);
  ts_delay = UTI_DiffTimespecsToDouble(&local_ts->ts, &ts);
  if (fabs(ts_delay) > MAX_TS_DELAY) {
    DEBUG_LOG("Unacceptable timestamp delay %.9f", ts_delay);
    return;
  }
  local_ts->ts = ts;
  local_ts->err = local_err;
  local_ts->source = NTP_TS_HARDWARE;
 }
 /* ================================================== */
 /* Extract UDP data from a layer 2 message.  Supported is Ethernet
   with optional VLAN tags. */
 static int
 extract_udp_data(unsigned char *msg, NTP_Remote_Address *remote_addr, int len)
 {
  unsigned char *msg_start = msg;
  union sockaddr_in46 addr;
  remote_addr->ip_addr.family = IPADDR_UNSPEC;
  remote_addr->port = 0;
  /* Skip MACs */
  if (len < 12)
    return 0;
  len -= 12, msg += 12;
  /* Skip VLAN tag(s) if present */
  while (len >= 4 && msg[0] == 0x81 && msg[1] == 0x00)
    len -= 4, msg += 4;
  /* Skip IPv4 or IPv6 ethertype */
  if (len < 2 || !((msg[0] == 0x08 && msg[1] == 0x00) ||
                   (msg[0] == 0x86 && msg[1] == 0xdd)))
    return 0;
  len -= 2, msg += 2;
  /* Parse destination address and port from IPv4/IPv6 and UDP headers */
  if (len >= 20 && msg[0] >> 4 == 4) {
    int ihl = (msg[0] & 0xf) * 4;
    if (len < ihl + 8 || msg[9] != 17)
      return 0;
    memcpy(&addr.in4.sin_addr.s_addr, msg + 16, sizeof (uint32_t));
    addr.in4.sin_port = *(uint16_t *)(msg + ihl + 2);
    addr.in4.sin_family = AF_INET;
    len -= ihl + 8, msg += ihl + 8;
 #ifdef FEAT_IPV6
  } else if (len >= 48 && msg[0] >> 4 == 6) {
    int eh_len, next_header = msg[6];
    memcpy(&addr.in6.sin6_addr.s6_addr, msg + 24, 16);
    len -= 40, msg += 40;
    /* Skip IPv6 extension headers if present */
    while (next_header != 17) {
      switch (next_header) {
        case 44:  /* Fragment Header */
          /* Process only the first fragment */
          if (ntohs(*(uint16_t *)(msg + 2)) >> 3 != 0)
            return 0;
          eh_len = 8;
          break;
        case 0:   /* Hop-by-Hop Options */
        case 43:  /* Routing Header */
        case 60:  /* Destination Options */
        case 135: /* Mobility Header */
          eh_len = 8 * (msg[1] + 1);
          break;
        case 51:  /* Authentication Header */
          eh_len = 4 * (msg[1] + 2);
          break;
        default:
          return 0;
      }
      if (eh_len < 8 || len < eh_len + 8)
        return 0;
      next_header = msg[0];
      len -= eh_len, msg += eh_len;
    }
    addr.in6.sin6_port = *(uint16_t *)(msg + 2);
    addr.in6.sin6_family = AF_INET6;
    len -= 8, msg += 8;
 #endif
  } else {
    return 0;
  }
  UTI_SockaddrToIPAndPort(&addr.u, &remote_addr->ip_addr, &remote_addr->port);
  /* Move the message to fix alignment of its fields */
  if (len > 0)
    memmove(msg_start, msg, len);
  return len;
 }
 /* ================================================== */
 int
 NIO_Linux_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
                         NTP_Local_Timestamp *local_ts, struct msghdr *hdr, int length)
 {
  struct Interface *iface;
  struct cmsghdr *cmsg;
  int is_tx, ts_if_index, l2_length;
  is_tx = hdr->msg_flags & MSG_ERRQUEUE;
  iface = NULL;
  ts_if_index = local_addr->if_index;
  l2_length = 0;
  for (cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
 #ifdef HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO
    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMPING_PKTINFO) {
      struct scm_ts_pktinfo ts_pktinfo;
      memcpy(&ts_pktinfo, CMSG_DATA(cmsg), sizeof (ts_pktinfo));
      ts_if_index = ts_pktinfo.if_index;
      l2_length = ts_pktinfo.pkt_length;
      DEBUG_LOG("Received HW timestamp info if=%d length=%d", ts_if_index, l2_length);
    }
 #endif
    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMPING) {
      struct scm_timestamping ts3;
      memcpy(&ts3, CMSG_DATA(cmsg), sizeof (ts3));
      if (!UTI_IsZeroTimespec(&ts3.ts[2])) {
        iface = get_interface(ts_if_index);
        if (iface) {
          process_hw_timestamp(iface, &ts3.ts[2], local_ts, !is_tx ? length : 0,
                               remote_addr->ip_addr.family, l2_length);
        } else {
          DEBUG_LOG("HW clock not found for interface %d", ts_if_index);
        }
        /* If a HW transmit timestamp was received, resume processing
           of non-error messages on this socket */
        if (is_tx)
          resume_socket(local_addr->sock_fd);
      }
      if (local_ts->source == NTP_TS_DAEMON && !UTI_IsZeroTimespec(&ts3.ts[0]) &&
          (!is_tx || UTI_IsZeroTimespec(&ts3.ts[2]))) {
        LCL_CookTime(&ts3.ts[0], &local_ts->ts, &local_ts->err);
        local_ts->source = NTP_TS_KERNEL;
      }
    }
    if ((cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR) ||
        (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_RECVERR)) {
      struct sock_extended_err err;
      memcpy(&err, CMSG_DATA(cmsg), sizeof (err));
      if (err.ee_errno != ENOMSG || err.ee_info != SCM_TSTAMP_SND ||
          err.ee_origin != SO_EE_ORIGIN_TIMESTAMPING) {
        DEBUG_LOG("Unknown extended error");
        /* Drop the message */
        return 1;
      }
    }
  }
  /* If the kernel is slow with enabling RX timestamping, open a dummy
     socket to keep the kernel RX timestamping permanently enabled */
  if (!is_tx && local_ts->source == NTP_TS_DAEMON && ts_flags) {
    DEBUG_LOG("Missing kernel RX timestamp");
    if (dummy_rxts_socket == INVALID_SOCK_FD)
      dummy_rxts_socket = open_dummy_socket();
  }
  /* Return the message if it's not received from the error queue */
  if (!is_tx)
    return 0;
  /* The data from the error queue includes all layers up to UDP.  We have to
     extract the UDP data and also the destination address with port as there
     currently doesn't seem to be a better way to get them both. */
  l2_length = length;
  length = extract_udp_data(hdr->msg_iov[0].iov_base, remote_addr, length);
  DEBUG_LOG("Received %d (%d) bytes from error queue for %s:%d fd=%d if=%d tss=%u",
            l2_length, length, UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
            local_addr->sock_fd, local_addr->if_index, local_ts->source);
  /* Update assumed position of UDP data at layer 2 for next received packet */
  if (iface && length) {
    if (remote_addr->ip_addr.family == IPADDR_INET4)
      iface->l2_udp4_ntp_start = l2_length - length;
    else if (remote_addr->ip_addr.family == IPADDR_INET6)
      iface->l2_udp6_ntp_start = l2_length - length;
  }
  /* Drop the message if it has no timestamp or its processing failed */
  if (local_ts->source == NTP_TS_DAEMON) {
    DEBUG_LOG("Missing TX timestamp");
    return 1;
  }
  if (length < NTP_NORMAL_PACKET_LENGTH)
    return 1;
  NSR_ProcessTx(remote_addr, local_addr, local_ts,
                (NTP_Packet *)hdr->msg_iov[0].iov_base, length);
  return 1;
 }
 /* ================================================== */
 int
 NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd)
 {
  struct cmsghdr *cmsg;
  if (!ts_flags)
    return cmsglen;
  /* If a HW transmit timestamp is requested on a client socket, monitor
     events on the socket in order to avoid processing of a fast response
     without the HW timestamp of the request */
  if (ts_tx_flags & SOF_TIMESTAMPING_TX_HARDWARE && !NIO_IsServerSocket(sock_fd))
    monitored_socket = sock_fd;
  /* Check if TX timestamping is disabled on this socket */
  if (permanent_ts_options || !NIO_IsServerSocket(sock_fd))
    return cmsglen;
  /* Add control message that will enable TX timestamping for this message.
     Don't use CMSG_NXTHDR as the one in glibc is buggy for creating new
     control messages. */
  cmsg = CMSG_FIRSTHDR(msg);
  if (!cmsg || cmsglen + CMSG_SPACE(sizeof (ts_tx_flags)) > msg->msg_controllen)
    return cmsglen;
  cmsg = (struct cmsghdr *)((char *)cmsg + cmsglen);
  memset(cmsg, 0, CMSG_SPACE(sizeof (ts_tx_flags)));
  cmsglen += CMSG_SPACE(sizeof (ts_tx_flags));
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SO_TIMESTAMPING;
  cmsg->cmsg_len = CMSG_LEN(sizeof (ts_tx_flags));
  memcpy(CMSG_DATA(cmsg), &ts_tx_flags, sizeof (ts_tx_flags));
  return cmsglen;
 }
 /* ================================================== */
 void
 NIO_Linux_NotifySocketClosing(int sock_fd)
 {
  resume_socket(sock_fd);
 }
--- a/ntp_io_linux.h
+++ b/ntp_io_linux.h
@@ -1,45 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  This is the header file for the Linux-specific NTP socket I/O bits.
  */
 #ifndef GOT_NTP_IO_LINUX_H
 #define GOT_NTP_IO_LINUX_H
 extern void NIO_Linux_Initialise(void);
 extern void NIO_Linux_Finalise(void);
 extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
 extern int NIO_Linux_ProcessEvent(int sock_fd, int event);
 extern int NIO_Linux_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
                                    NTP_Local_Timestamp *local_ts, struct msghdr *hdr, int length);
 extern int NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd);
 extern void NIO_Linux_NotifySocketClosing(int sock_fd);
 #endif
--- a/ntp_signd.c
+++ b/ntp_signd.c
@@ -1,379 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Support for MS-SNTP authentication in Samba (ntp_signd)
  */
 #include "config.h"
 #include "sysincl.h"
 #include "array.h"
 #include "conf.h"
 #include "logging.h"
 #include "ntp_io.h"
 #include "ntp_signd.h"
 #include "sched.h"
 #include "util.h"
 /* Declarations per samba/source4/librpc/idl/ntp_signd.idl */
 #define SIGND_VERSION 0
 typedef enum {
  SIGN_TO_CLIENT = 0,
  ASK_SERVER_TO_SIGN = 1,
  CHECK_SERVER_SIGNATURE = 2,
  SIGNING_SUCCESS = 3,
  SIGNING_FAILURE = 4,
 } SigndOp;
 typedef struct {
  uint32_t length;
  uint32_t version;
  uint32_t op;
  uint16_t packet_id;
  uint16_t _pad;
  uint32_t key_id;
  NTP_Packet packet_to_sign;
 } SigndRequest;
 typedef struct {
  uint32_t length;
  uint32_t version;
  uint32_t op;
  uint32_t packet_id;
  NTP_Packet signed_packet;
 } SigndResponse;
 typedef struct {
  NTP_Remote_Address remote_addr;
  NTP_Local_Address local_addr;
  int sent;
  int received;
  int request_length;
  struct timespec request_ts;
  SigndRequest request;
  SigndResponse response;
 } SignInstance;
 /* As the communication with ntp_signd is asynchronous, incoming packets are
   saved in a queue in order to avoid loss when they come in bursts */
 #define MAX_QUEUE_LENGTH 16U
 #define NEXT_QUEUE_INDEX(index) (((index) + 1) % MAX_QUEUE_LENGTH)
 #define IS_QUEUE_EMPTY() (queue_head == queue_tail)
 /* Fixed-size array of SignInstance */
 static ARR_Instance queue;
 static unsigned int queue_head;
 static unsigned int queue_tail;
 #define INVALID_SOCK_FD -1
 /* Unix domain socket connected to ntp_signd */
 static int sock_fd;
 #define MIN_AUTH_DELAY 1.0e-5
 #define MAX_AUTH_DELAY 1.0e-2
 /* Average time needed for signing one packet.  This is used to adjust the
   transmit timestamp in NTP packets.  The timestamp won't be very accurate as
   the delay is variable, but it should be good enough for MS-SNTP clients. */
 static double auth_delay;
 /* Flag indicating if the MS-SNTP authentication is enabled */
 static int enabled;
 /* ================================================== */
 static void read_write_socket(int sock_fd, int event, void *anything);
 /* ================================================== */
 static void
 close_socket(void)
 {
  SCH_RemoveFileHandler(sock_fd);
  close(sock_fd);
  sock_fd = INVALID_SOCK_FD;
  /* Empty the queue */
  queue_head = queue_tail = 0;
 }
 /* ================================================== */
 static int
 open_socket(void)
 {
  struct sockaddr_un s;
  if (sock_fd >= 0)
    return 1;
  sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
  if (sock_fd < 0) {
    DEBUG_LOG("Could not open signd socket : %s", strerror(errno));
    return 0;
  }
  UTI_FdSetCloexec(sock_fd);
  SCH_AddFileHandler(sock_fd, SCH_FILE_INPUT, read_write_socket, NULL);
  s.sun_family = AF_UNIX;
  if (snprintf(s.sun_path, sizeof (s.sun_path), "%s/socket",
               CNF_GetNtpSigndSocket()) >= sizeof (s.sun_path)) {
    DEBUG_LOG("signd socket path too long");
    close_socket();
    return 0;
  }
  if (connect(sock_fd, (struct sockaddr *)&s, sizeof (s)) < 0) {
    DEBUG_LOG("Could not connect to signd : %s", strerror(errno));
    close_socket();
    return 0;
  }
  DEBUG_LOG("Connected to signd");
  return 1;
 }
 /* ================================================== */
 static void
 process_response(SignInstance *inst)
 {
  struct timespec ts;
  double delay;
  if (ntohs(inst->request.packet_id) != ntohl(inst->response.packet_id)) {
    DEBUG_LOG("Invalid response ID");
    return;
  }
  if (ntohl(inst->response.op) != SIGNING_SUCCESS) {
    DEBUG_LOG("Signing failed");
    return;
  }
  /* Check if the file descriptor is still valid */
  if (!NIO_IsServerSocket(inst->local_addr.sock_fd)) {
    DEBUG_LOG("Invalid NTP socket");
    return;
  }
  SCH_GetLastEventTime(NULL, NULL, &ts);
  delay = UTI_DiffTimespecsToDouble(&ts, &inst->request_ts);
  DEBUG_LOG("Signing succeeded (delay %f)", delay);
  /* Send the signed NTP packet */
  NIO_SendPacket(&inst->response.signed_packet, &inst->remote_addr, &inst->local_addr,
                 ntohl(inst->response.length) + sizeof (inst->response.length) -
                 offsetof(SigndResponse, signed_packet), 0);
  /* Update exponential moving average of the authentication delay */
  delay = CLAMP(MIN_AUTH_DELAY, delay, MAX_AUTH_DELAY);
  auth_delay += 0.1 * (delay - auth_delay);
 }
 /* ================================================== */
 static void
 read_write_socket(int sock_fd, int event, void *anything)
 {
  SignInstance *inst;
  uint32_t response_length;
  int s;
  inst = ARR_GetElement(queue, queue_head);
  if (event == SCH_FILE_OUTPUT) {
    assert(!IS_QUEUE_EMPTY());
    assert(inst->sent < inst->request_length);
    if (!inst->sent)
      SCH_GetLastEventTime(NULL, NULL, &inst->request_ts);
    s = send(sock_fd, (char *)&inst->request + inst->sent,
             inst->request_length - inst->sent, 0);
    if (s < 0) {
      DEBUG_LOG("signd socket error: %s", strerror(errno));
      close_socket();
      return;
    }
    DEBUG_LOG("Sent %d bytes to signd", s);
    inst->sent += s;
    /* Try again later if the request is not complete yet */
    if (inst->sent < inst->request_length)
      return;
    /* Disable output and wait for a response */
    SCH_SetFileHandlerEvent(sock_fd, SCH_FILE_OUTPUT, 0);
  }
  if (event == SCH_FILE_INPUT) {
    if (IS_QUEUE_EMPTY()) {
        DEBUG_LOG("Unexpected signd response");
        close_socket();
        return;
    }
    assert(inst->received < sizeof (inst->response));
    s = recv(sock_fd, (char *)&inst->response + inst->received,
             sizeof (inst->response) - inst->received, 0);
    if (s <= 0) {
      if (s < 0)
        DEBUG_LOG("signd socket error: %s", strerror(errno));
      else
        DEBUG_LOG("signd socket closed");
      close_socket();
      return;
    }
    DEBUG_LOG("Received %d bytes from signd", s);
    inst->received += s;
    if (inst->received < sizeof (inst->response.length))
      return;
    response_length = ntohl(inst->response.length) + sizeof (inst->response.length);
    if (response_length < offsetof(SigndResponse, signed_packet) ||
        response_length > sizeof (SigndResponse)) {
      DEBUG_LOG("Invalid response length");
      close_socket();
      return;
    }
    /* Wait for more data if not complete yet */
    if (inst->received < response_length)
      return;
    process_response(inst);
    /* Move the head and enable output for the next packet */
    queue_head = NEXT_QUEUE_INDEX(queue_head);
    if (!IS_QUEUE_EMPTY())
      SCH_SetFileHandlerEvent(sock_fd, SCH_FILE_OUTPUT, 1);
  }
 }
 /* ================================================== */
 void
 NSD_Initialise()
 {
  sock_fd = INVALID_SOCK_FD;
  auth_delay = MIN_AUTH_DELAY;
  enabled = CNF_GetNtpSigndSocket() && CNF_GetNtpSigndSocket()[0];
  if (!enabled)
    return;
  queue = ARR_CreateInstance(sizeof (SignInstance));
  ARR_SetSize(queue, MAX_QUEUE_LENGTH);
  queue_head = queue_tail = 0;
  LOG(LOGS_INFO, "MS-SNTP authentication enabled");
 }
 /* ================================================== */
 void
 NSD_Finalise()
 {
  if (!enabled)
    return;
  if (sock_fd != INVALID_SOCK_FD)
    close_socket();
  ARR_DestroyInstance(queue);
 }
 /* ================================================== */
 extern int NSD_GetAuthDelay(uint32_t key_id)
 {
  return 1.0e9 * auth_delay;
 }
 /* ================================================== */
 int
 NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length)
 {
  SignInstance *inst;
  if (!enabled) {
    DEBUG_LOG("signd disabled");
    return 0;
  }
  if (queue_head == NEXT_QUEUE_INDEX(queue_tail)) {
    DEBUG_LOG("signd queue full");
    return 0;
  }
  if (length != NTP_NORMAL_PACKET_LENGTH) {
    DEBUG_LOG("Invalid packet length");
    return 0;
  }
  if (!open_socket())
    return 0;
  inst = ARR_GetElement(queue, queue_tail);
  inst->remote_addr = *remote_addr;
  inst->local_addr = *local_addr;
  inst->sent = 0;
  inst->received = 0;
  inst->request_length = offsetof(SigndRequest, packet_to_sign) + length;
  /* The length field doesn't include itself */
  inst->request.length = htonl(inst->request_length - sizeof (inst->request.length));
  inst->request.version = htonl(SIGND_VERSION);
  inst->request.op = htonl(SIGN_TO_CLIENT);
  inst->request.packet_id = htons(queue_tail);
  inst->request._pad = 0;
  inst->request.key_id = htonl(key_id);
  memcpy(&inst->request.packet_to_sign, packet, length);
  /* Enable output if there was no pending request */
  if (IS_QUEUE_EMPTY())
    SCH_SetFileHandlerEvent(sock_fd, SCH_FILE_OUTPUT, 1);
  queue_tail = NEXT_QUEUE_INDEX(queue_tail);
  DEBUG_LOG("Packet added to signd queue (%u:%u)", queue_head, queue_tail);
  return 1;
 }
--- a/ntp_signd.h
+++ b/ntp_signd.h
@@ -1,44 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Miroslav Lichvar  2016
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 **********************************************************************
  =======================================================================
  Header for MS-SNTP authentication via Samba (ntp_signd) */
 #ifndef GOT_NTP_SIGND_H
 #define GOT_NTP_SIGND_H
 #include "addressing.h"
 #include "ntp.h"
 /* Initialisation function */
 extern void NSD_Initialise(void);
 /* Finalisation function */
 extern void NSD_Finalise(void);
 /* Function to get an estimate of delay due to signing */
 extern int NSD_GetAuthDelay(uint32_t key_id);
 /* Function to sign an NTP packet and send it */
 extern int NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
 #endif
--- a/ntp_sources.c
+++ b/ntp_sources.c
--- a/ntp_sources.h
+++ b/ntp_sources.h
@@ -50,10 +50,10 @@ typedef enum {
 /* Procedure to add a new server or peer source. */
 extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params);
-/* Procedure to add a new server, peer source, or pool of servers specified by
+/* Procedure to add a new server or peer source with currently unknown address.
-   name instead of address.  The name is resolved in exponentially increasing
+   The name will be periodically resolved in exponentially increasing intervals
-   intervals until it succeeds or fails with a non-temporary error. */
+   until it succeeds or fails with a non-temporary error. */
-extern void NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, SourceParameters *params);
+extern void NSR_AddUnresolvedSource(char *name, int port, NTP_Source_Type type, SourceParameters *params);
 /* Function type for handlers to be called back when an attempt
 * (possibly unsuccessful) to resolve unresolved sources ends */
@@ -77,23 +77,8 @@ extern NSR_Status NSR_RemoveSource(NTP_Remote_Address *remote_addr);
 /* Procedure to remove all sources */
 extern void NSR_RemoveAllSources(void);
 /* Procedure to try to find a replacement for a bad source */
 extern void NSR_HandleBadSource(IPAddr *address);
 /* Procedure to resolve all names again */
 extern void NSR_RefreshAddresses(void);
 /* Procedure to get local reference ID corresponding to a source */
 extern uint32_t NSR_GetLocalRefid(IPAddr *address);
 /* This routine is called by ntp_io when a new packet arrives off the network */
-extern void NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+extern void NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
                          NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
 /* This routine is called by ntp_io when a packet was sent to the network and
   an accurate transmit timestamp was captured */
 extern void NSR_ProcessTx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
                          NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
 /* Initialisation function */
 extern void NSR_Initialise(void);
@@ -102,9 +87,14 @@ extern void NSR_Initialise(void);
 extern void NSR_Finalise(void);
 /* This routine is used to indicate that sources whose IP addresses
-   match a particular subnet should be set online or offline.  It returns
+   match a particular subnet should be set online again.  Returns a
-   a flag indicating whether any hosts matched the address. */
+   flag indicating whether any hosts matched the address */
-extern int NSR_SetConnectivity(IPAddr *mask, IPAddr *address, SRC_Connectivity connectivity);
+extern int NSR_TakeSourcesOnline(IPAddr *mask, IPAddr *address);
 /* This routine is used to indicate that sources whose IP addresses
   match a particular subnet should be set offline.  Returns a flag
   indicating whether any hosts matched the address */
 extern int NSR_TakeSourcesOffline(IPAddr *mask, IPAddr *address);
 extern int NSR_ModifyMinpoll(IPAddr *address, int new_minpoll);
@@ -122,9 +112,7 @@ extern int NSR_ModifyPolltarget(IPAddr *address, int new_poll_target);
 extern int NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples, IPAddr *mask, IPAddr *address);
-extern void NSR_ReportSource(RPT_SourceReport *report, struct timespec *now);
+extern void NSR_ReportSource(RPT_SourceReport *report, struct timeval *now);
 extern int NSR_GetNTPReport(RPT_NTPReport *report);
 extern void NSR_GetActivityReport(RPT_ActivityReport *report);
--- a/pktlength.c
+++ b/pktlength.c
@@ -3,7 +3,6 @@
 **********************************************************************
 * Copyright (C) Richard P. Curnow  1997-2002
 * Copyright (C) Miroslav Lichvar  2014-2016
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -34,131 +33,138 @@
 #include "util.h"
 #include "pktlength.h"
 #define PADDING_LENGTH_(request_length, reply_length) \
  (uint16_t)((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
 #define PADDING_LENGTH(request_data, reply_data) \
  PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
 #define REQ_LENGTH_ENTRY(request_data_field, reply_data_field) \
  { offsetof(CMD_Request, data.request_data_field.EOR), \
    PADDING_LENGTH(data.request_data_field.EOR, data.reply_data_field.EOR) }
 #define RPY_LENGTH_ENTRY(reply_data_field) \
  offsetof(CMD_Reply, data.reply_data_field.EOR)
 /* ================================================== */
-struct request_length {
+static int
-  uint16_t command;
+command_unpadded_length(CMD_Request *r)
-  uint16_t padding;
+{
-};
+  int type;
  type = ntohs(r->command);
  if (type < 0 || type >= N_REQUEST_TYPES) {
    return 0;
  } else {
    switch (type) {
-static const struct request_length request_lengths[] = {
+      case REQ_NULL:
-  REQ_LENGTH_ENTRY(null, null),                 /* NULL */
+        return offsetof(CMD_Request, data);
-  REQ_LENGTH_ENTRY(online, null),               /* ONLINE */
+      case REQ_ONLINE:
-  REQ_LENGTH_ENTRY(offline, null),              /* OFFLINE */
+        return offsetof(CMD_Request, data.online.EOR);
-  REQ_LENGTH_ENTRY(burst, null),                /* BURST */
+      case REQ_OFFLINE:
-  REQ_LENGTH_ENTRY(modify_minpoll, null),       /* MODIFY_MINPOLL */
+        return offsetof(CMD_Request, data.offline.EOR);
-  REQ_LENGTH_ENTRY(modify_maxpoll, null),       /* MODIFY_MAXPOLL */
+      case REQ_BURST:
-  REQ_LENGTH_ENTRY(dump, null),                 /* DUMP */
+        return offsetof(CMD_Request, data.burst.EOR);
-  REQ_LENGTH_ENTRY(modify_maxdelay, null),      /* MODIFY_MAXDELAY */
+      case REQ_MODIFY_MINPOLL:
-  REQ_LENGTH_ENTRY(modify_maxdelayratio, null), /* MODIFY_MAXDELAYRATIO */
+        return offsetof(CMD_Request, data.modify_minpoll.EOR);
-  REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
+      case REQ_MODIFY_MAXPOLL:
-  REQ_LENGTH_ENTRY(logon, null),                /* LOGON */
+        return offsetof(CMD_Request, data.modify_maxpoll.EOR);
-  REQ_LENGTH_ENTRY(settime, manual_timestamp),  /* SETTIME */
+      case REQ_DUMP:
-  { 0, 0 },                                     /* LOCAL */
+        return offsetof(CMD_Request, data.dump.EOR);
-  REQ_LENGTH_ENTRY(manual, null),               /* MANUAL */
+      case REQ_MODIFY_MAXDELAY:
-  REQ_LENGTH_ENTRY(null, n_sources),            /* N_SOURCES */
+        return offsetof(CMD_Request, data.modify_maxdelay.EOR);
-  REQ_LENGTH_ENTRY(source_data, source_data),   /* SOURCE_DATA */
+      case REQ_MODIFY_MAXDELAYRATIO:
-  REQ_LENGTH_ENTRY(null, null),                 /* REKEY */
+        return offsetof(CMD_Request, data.modify_maxdelayratio.EOR);
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* ALLOW */
+      case REQ_MODIFY_MAXDELAYDEVRATIO:
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* ALLOWALL */
+        return offsetof(CMD_Request, data.modify_maxdelaydevratio.EOR);
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* DENY */
+      case REQ_MODIFY_MAXUPDATESKEW:
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* DENYALL */
+        return offsetof(CMD_Request, data.modify_maxupdateskew.EOR);
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDALLOW */
+      case REQ_LOGON :
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDALLOWALL */
+        return offsetof(CMD_Request, data.logon.EOR);
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDDENY */
+      case REQ_SETTIME :
-  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDDENYALL */
+        return offsetof(CMD_Request, data.settime.EOR);
-  REQ_LENGTH_ENTRY(ac_check, null),             /* ACCHECK */
+      case REQ_LOCAL :
-  REQ_LENGTH_ENTRY(ac_check, null),             /* CMDACCHECK */
+        return offsetof(CMD_Request, data.local.EOR);
-  { 0, 0 },                                     /* ADD_SERVER */
+      case REQ_MANUAL :
-  { 0, 0 },                                     /* ADD_PEER */
+        return offsetof(CMD_Request, data.manual.EOR);
-  REQ_LENGTH_ENTRY(del_source, null),           /* DEL_SOURCE */
+      case REQ_N_SOURCES :
-  REQ_LENGTH_ENTRY(null, null),                 /* WRITERTC */
+        return offsetof(CMD_Request, data.n_sources.EOR);
-  REQ_LENGTH_ENTRY(dfreq, null),                /* DFREQ */
+      case REQ_SOURCE_DATA :
-  REQ_LENGTH_ENTRY(doffset, null),              /* DOFFSET */
+        return offsetof(CMD_Request, data.source_data.EOR);
-  REQ_LENGTH_ENTRY(null, tracking),             /* TRACKING */
+      case REQ_REKEY :
-  REQ_LENGTH_ENTRY(sourcestats, sourcestats),   /* SOURCESTATS */
+        return offsetof(CMD_Request, data.rekey.EOR);
-  REQ_LENGTH_ENTRY(null, rtc),                  /* RTCREPORT */
+      case REQ_ALLOW :
-  REQ_LENGTH_ENTRY(null, null),                 /* TRIMRTC */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(null, null),                 /* CYCLELOGS */
+      case REQ_ALLOWALL :
-  { 0, 0 },                                     /* SUBNETS_ACCESSED - not supported */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  { 0, 0 },                                     /* CLIENT_ACCESSES - not supported */
+      case REQ_DENY :
-  { 0, 0 },                                     /* CLIENT_ACCESSES_BY_INDEX - not supported */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(null, manual_list),          /* MANUAL_LIST */
+      case REQ_DENYALL :
-  REQ_LENGTH_ENTRY(manual_delete, null),        /* MANUAL_DELETE */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(null, null),                 /* MAKESTEP */
+      case REQ_CMDALLOW :
-  REQ_LENGTH_ENTRY(null, activity),             /* ACTIVITY */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(modify_minstratum, null),    /* MODIFY_MINSTRATUM */
+      case REQ_CMDALLOWALL :
-  REQ_LENGTH_ENTRY(modify_polltarget, null),    /* MODIFY_POLLTARGET */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(modify_maxdelaydevratio, null), /* MODIFY_MAXDELAYDEVRATIO */
+      case REQ_CMDDENY :
-  REQ_LENGTH_ENTRY(null, null),                 /* RESELECT */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(reselect_distance, null),    /* RESELECTDISTANCE */
+      case REQ_CMDDENYALL :
-  REQ_LENGTH_ENTRY(modify_makestep, null),      /* MODIFY_MAKESTEP */
+        return offsetof(CMD_Request, data.allow_deny.EOR);
-  REQ_LENGTH_ENTRY(null, smoothing),            /* SMOOTHING */
+      case REQ_ACCHECK :
-  REQ_LENGTH_ENTRY(smoothtime, null),           /* SMOOTHTIME */
+        return offsetof(CMD_Request, data.ac_check.EOR);
-  REQ_LENGTH_ENTRY(null, null),                 /* REFRESH */
+      case REQ_CMDACCHECK :
-  REQ_LENGTH_ENTRY(null, server_stats),         /* SERVER_STATS */
+        return offsetof(CMD_Request, data.ac_check.EOR);
-  REQ_LENGTH_ENTRY(client_accesses_by_index,
+      case REQ_ADD_SERVER :
-                   client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
+        return offsetof(CMD_Request, data.ntp_source.EOR);
-  REQ_LENGTH_ENTRY(local, null),                /* LOCAL2 */
+      case REQ_ADD_PEER :
-  REQ_LENGTH_ENTRY(ntp_data, ntp_data),         /* NTP_DATA */
+        return offsetof(CMD_Request, data.ntp_source.EOR);
-  { 0, 0 },                                     /* ADD_SERVER2 */
+      case REQ_DEL_SOURCE :
-  { 0, 0 },                                     /* ADD_PEER2 */
+        return offsetof(CMD_Request, data.del_source.EOR);
-  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_SERVER3 */
+      case REQ_WRITERTC :
-  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_PEER3 */
+        return offsetof(CMD_Request, data.writertc.EOR);
-  REQ_LENGTH_ENTRY(null, null),                 /* SHUTDOWN */
+      case REQ_DFREQ :
-  REQ_LENGTH_ENTRY(null, null),                 /* ONOFFLINE */
+        return offsetof(CMD_Request, data.dfreq.EOR);
-};
+      case REQ_DOFFSET :
        return offsetof(CMD_Request, data.doffset.EOR);
      case REQ_TRACKING :
        return offsetof(CMD_Request, data.tracking.EOR);
      case REQ_SOURCESTATS :
        return offsetof(CMD_Request, data.sourcestats.EOR);
      case REQ_RTCREPORT :
        return offsetof(CMD_Request, data.rtcreport.EOR);
      case REQ_TRIMRTC :
        return offsetof(CMD_Request, data.trimrtc.EOR);
      case REQ_CYCLELOGS :
        return offsetof(CMD_Request, data.cyclelogs.EOR);
      case REQ_SUBNETS_ACCESSED :
      case REQ_CLIENT_ACCESSES:
        /* No longer supported */
        return 0;
      case REQ_CLIENT_ACCESSES_BY_INDEX:
        return offsetof(CMD_Request, data.client_accesses_by_index.EOR);
      case REQ_MANUAL_LIST:
        return offsetof(CMD_Request, data.manual_list.EOR);
      case REQ_MANUAL_DELETE:
        return offsetof(CMD_Request, data.manual_delete.EOR);
      case REQ_MAKESTEP:
        return offsetof(CMD_Request, data.make_step.EOR);
      case REQ_ACTIVITY:
        return offsetof(CMD_Request, data.activity.EOR);
      case REQ_RESELECT:
        return offsetof(CMD_Request, data.reselect.EOR);
      case REQ_RESELECTDISTANCE:
        return offsetof(CMD_Request, data.reselect_distance.EOR);
      case REQ_MODIFY_MINSTRATUM:
        return offsetof(CMD_Request, data.modify_minstratum.EOR);
      case REQ_MODIFY_POLLTARGET:
        return offsetof(CMD_Request, data.modify_polltarget.EOR);
      default:
        /* If we fall through the switch, it most likely means we've forgotten to implement a new case */
        assert(0);
    }
  }
  /* Catch-all case */
  return 0;
 }
 static const uint16_t reply_lengths[] = {
  0,                                            /* empty slot */
  RPY_LENGTH_ENTRY(null),                       /* NULL */
  RPY_LENGTH_ENTRY(n_sources),                  /* N_SOURCES */
  RPY_LENGTH_ENTRY(source_data),                /* SOURCE_DATA */
  0,                                            /* MANUAL_TIMESTAMP */
  RPY_LENGTH_ENTRY(tracking),                   /* TRACKING */
  RPY_LENGTH_ENTRY(sourcestats),                /* SOURCESTATS */
  RPY_LENGTH_ENTRY(rtc),                        /* RTC */
  0,                                            /* SUBNETS_ACCESSED - not supported */
  0,                                            /* CLIENT_ACCESSES - not supported */
  0,                                            /* CLIENT_ACCESSES_BY_INDEX - not supported */
  0,                                            /* MANUAL_LIST - not supported */
  RPY_LENGTH_ENTRY(activity),                   /* ACTIVITY */
  RPY_LENGTH_ENTRY(smoothing),                  /* SMOOTHING */
  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS */
  RPY_LENGTH_ENTRY(client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
  RPY_LENGTH_ENTRY(ntp_data),                   /* NTP_DATA */
  RPY_LENGTH_ENTRY(manual_timestamp),           /* MANUAL_TIMESTAMP2 */
  RPY_LENGTH_ENTRY(manual_list),                /* MANUAL_LIST2 */
 };
 /* ================================================== */
 int
 PKL_CommandLength(CMD_Request *r)
 {
  uint32_t type;
  int command_length;
-  assert(sizeof (request_lengths) / sizeof (request_lengths[0]) == N_REQUEST_TYPES);
+  command_length = command_unpadded_length(r);
  type = ntohs(r->command);
  if (type >= N_REQUEST_TYPES)
    return 0;
  command_length = request_lengths[type].command;
  if (!command_length)
    return 0;
@@ -167,20 +173,131 @@ PKL_CommandLength(CMD_Request *r)
 /* ================================================== */
 #define PADDING_LENGTH_(request_length, reply_length) \
  ((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
 #define PADDING_LENGTH(request_data, reply_data) \
  PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
 int
 PKL_CommandPaddingLength(CMD_Request *r)
 {
-  uint32_t type;
+  int type;
  if (r->version < PROTO_VERSION_PADDING)
    return 0;
  type = ntohs(r->command);
-  if (type >= N_REQUEST_TYPES)
+  if (type < 0 || type >= N_REQUEST_TYPES)
    return 0;
-  return request_lengths[ntohs(r->command)].padding;
+  switch (type) {
    case REQ_NULL:
      return PADDING_LENGTH(data, data.null.EOR);
    case REQ_ONLINE:
      return PADDING_LENGTH(data.online.EOR, data.null.EOR);
    case REQ_OFFLINE:
      return PADDING_LENGTH(data.offline.EOR, data.null.EOR);
    case REQ_BURST:
      return PADDING_LENGTH(data.burst.EOR, data.null.EOR);
    case REQ_MODIFY_MINPOLL:
      return PADDING_LENGTH(data.modify_minpoll.EOR, data.null.EOR);
    case REQ_MODIFY_MAXPOLL:
      return PADDING_LENGTH(data.modify_maxpoll.EOR, data.null.EOR);
    case REQ_DUMP:
      return PADDING_LENGTH(data.dump.EOR, data.null.EOR);
    case REQ_MODIFY_MAXDELAY:
      return PADDING_LENGTH(data.modify_maxdelay.EOR, data.null.EOR);
    case REQ_MODIFY_MAXDELAYRATIO:
      return PADDING_LENGTH(data.modify_maxdelayratio.EOR, data.null.EOR);
    case REQ_MODIFY_MAXDELAYDEVRATIO:
      return PADDING_LENGTH(data.modify_maxdelaydevratio.EOR, data.null.EOR);
    case REQ_MODIFY_MAXUPDATESKEW:
      return PADDING_LENGTH(data.modify_maxupdateskew.EOR, data.null.EOR);
    case REQ_LOGON:
      return PADDING_LENGTH(data.logon.EOR, data.null.EOR);
    case REQ_SETTIME:
      return PADDING_LENGTH(data.settime.EOR, data.manual_timestamp.EOR);
    case REQ_LOCAL:
      return PADDING_LENGTH(data.local.EOR, data.null.EOR);
    case REQ_MANUAL:
      return PADDING_LENGTH(data.manual.EOR, data.null.EOR);
    case REQ_N_SOURCES:
      return PADDING_LENGTH(data.n_sources.EOR, data.n_sources.EOR);
    case REQ_SOURCE_DATA:
      return PADDING_LENGTH(data.source_data.EOR, data.source_data.EOR);
    case REQ_REKEY:
      return PADDING_LENGTH(data.rekey.EOR, data.null.EOR);
    case REQ_ALLOW:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_ALLOWALL:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_DENY:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_DENYALL:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_CMDALLOW:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_CMDALLOWALL:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_CMDDENY:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_CMDDENYALL:
      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
    case REQ_ACCHECK:
      return PADDING_LENGTH(data.ac_check.EOR, data.null.EOR);
    case REQ_CMDACCHECK:
      return PADDING_LENGTH(data.ac_check.EOR, data.null.EOR);
    case REQ_ADD_SERVER:
      return PADDING_LENGTH(data.ntp_source.EOR, data.null.EOR);
    case REQ_ADD_PEER:
      return PADDING_LENGTH(data.ntp_source.EOR, data.null.EOR);
    case REQ_DEL_SOURCE:
      return PADDING_LENGTH(data.del_source.EOR, data.null.EOR);
    case REQ_WRITERTC:
      return PADDING_LENGTH(data.writertc.EOR, data.null.EOR);
    case REQ_DFREQ:
      return PADDING_LENGTH(data.dfreq.EOR, data.null.EOR);
    case REQ_DOFFSET:
      return PADDING_LENGTH(data.doffset.EOR, data.null.EOR);
    case REQ_TRACKING:
      return PADDING_LENGTH(data.tracking.EOR, data.tracking.EOR);
    case REQ_SOURCESTATS:
      return PADDING_LENGTH(data.sourcestats.EOR, data.sourcestats.EOR);
    case REQ_RTCREPORT:
      return PADDING_LENGTH(data.rtcreport.EOR, data.rtc.EOR);
    case REQ_TRIMRTC:
      return PADDING_LENGTH(data.trimrtc.EOR, data.null.EOR);
    case REQ_CYCLELOGS:
      return PADDING_LENGTH(data.cyclelogs.EOR, data.null.EOR);
    case REQ_SUBNETS_ACCESSED:
    case REQ_CLIENT_ACCESSES:
      /* No longer supported */
      return 0;
    case REQ_CLIENT_ACCESSES_BY_INDEX:
      return PADDING_LENGTH(data.client_accesses_by_index.EOR, data.client_accesses_by_index.EOR);
    case REQ_MANUAL_LIST:
      return PADDING_LENGTH(data.manual_list.EOR, data.manual_list.EOR);
    case REQ_MANUAL_DELETE:
      return PADDING_LENGTH(data.manual_delete.EOR, data.null.EOR);
    case REQ_MAKESTEP:
      return PADDING_LENGTH(data.make_step.EOR, data.null.EOR);
    case REQ_ACTIVITY:
      return PADDING_LENGTH(data.activity.EOR, data.activity.EOR);
    case REQ_RESELECT:
      return PADDING_LENGTH(data.reselect.EOR, data.null.EOR);
    case REQ_RESELECTDISTANCE:
      return PADDING_LENGTH(data.reselect_distance.EOR, data.null.EOR);
    case REQ_MODIFY_MINSTRATUM:
      return PADDING_LENGTH(data.modify_minstratum.EOR, data.null.EOR);
    case REQ_MODIFY_POLLTARGET:
      return PADDING_LENGTH(data.modify_polltarget.EOR, data.null.EOR);
    default:
      /* If we fall through the switch, it most likely means we've forgotten to implement a new case */
      assert(0);
      return 0;
  }
 }
 /* ================================================== */
@@ -188,17 +305,64 @@ PKL_CommandPaddingLength(CMD_Request *r)
 int
 PKL_ReplyLength(CMD_Reply *r)
 {
-  uint32_t type;
+  int type;
  assert(sizeof (reply_lengths) / sizeof (reply_lengths[0]) == N_REPLY_TYPES);
  type = ntohs(r->reply);
  /* Note that reply type codes start from 1, not 0 */
-  if (type < 1 || type >= N_REPLY_TYPES)
+  if (type < 1 || type >= N_REPLY_TYPES) {
    return 0;
  } else {
    switch (type) {
      case RPY_NULL:
        return offsetof(CMD_Reply, data.null.EOR);
      case RPY_N_SOURCES:
        return offsetof(CMD_Reply, data.n_sources.EOR);
      case RPY_SOURCE_DATA:
        return offsetof(CMD_Reply, data.source_data.EOR);
      case RPY_MANUAL_TIMESTAMP:
        return offsetof(CMD_Reply, data.manual_timestamp.EOR);
      case RPY_TRACKING:
        return offsetof(CMD_Reply, data.tracking.EOR);
      case RPY_SOURCESTATS:
        return offsetof(CMD_Reply, data.sourcestats.EOR);
      case RPY_RTC:
        return offsetof(CMD_Reply, data.rtc.EOR);
      case RPY_SUBNETS_ACCESSED :
      case RPY_CLIENT_ACCESSES:
        /* No longer supported */
        return 0;
      case RPY_CLIENT_ACCESSES_BY_INDEX:
        {
          unsigned long nc = ntohl(r->data.client_accesses_by_index.n_clients);
          if (r->status == htons(STT_SUCCESS)) {
            if (nc > MAX_CLIENT_ACCESSES)
              return 0;
            return (offsetof(CMD_Reply, data.client_accesses_by_index.clients) +
                    nc * sizeof(RPY_ClientAccesses_Client));
          } else {
            return offsetof(CMD_Reply, data);
          }
        }
      case RPY_MANUAL_LIST:
        {
          unsigned long ns = ntohl(r->data.manual_list.n_samples);
          if (ns > MAX_MANUAL_LIST_SAMPLES)
            return 0;
          if (r->status == htons(STT_SUCCESS)) {
            return (offsetof(CMD_Reply, data.manual_list.samples) +
                    ns * sizeof(RPY_ManualListSample));
          } else {
            return offsetof(CMD_Reply, data);
          }
        }
      case RPY_ACTIVITY:
        return offsetof(CMD_Reply, data.activity.EOR);
-  return reply_lengths[type];
+      default:
        assert(0);
    }
  }
  return 0;
 }
 /* ================================================== */
--- a/privops.c
+++ b/privops.c
@@ -1,731 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Bryan Christianson 2015
 * Copyright (C) Miroslav Lichvar  2017
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 **********************************************************************
  =======================================================================
  Perform privileged operations over a unix socket to a privileged fork.
  */
 #include "config.h"
 #include "sysincl.h"
 #include "conf.h"
 #include "nameserv.h"
 #include "logging.h"
 #include "privops.h"
 #include "util.h"
 #define OP_ADJUSTTIME     1024
 #define OP_ADJUSTTIMEX    1025
 #define OP_SETTIME        1026
 #define OP_BINDSOCKET     1027
 #define OP_NAME2IPADDRESS 1028
 #define OP_RELOADDNS      1029
 #define OP_QUIT           1099
 union sockaddr_in46 {
  struct sockaddr_in in4;
 #ifdef FEAT_IPV6
  struct sockaddr_in6 in6;
 #endif
  struct sockaddr u;
 };
 /* daemon request structs */
 typedef struct {
  struct timeval tv;
 } ReqAdjustTime;
 #ifdef PRIVOPS_ADJUSTTIMEX
 typedef struct {
  struct timex tmx;
 } ReqAdjustTimex;
 #endif
 typedef struct {
  struct timeval tv;
 } ReqSetTime;
 typedef struct {
  int sock;
  socklen_t sa_len;
  union sockaddr_in46 sa;
 } ReqBindSocket;
 typedef struct {
  char name[256];
 } ReqName2IPAddress;
 typedef struct {
  int op;
  union {
    ReqAdjustTime adjust_time;
 #ifdef PRIVOPS_ADJUSTTIMEX
    ReqAdjustTimex adjust_timex;
 #endif
    ReqSetTime set_time;
    ReqBindSocket bind_socket;
 #ifdef PRIVOPS_NAME2IPADDRESS
    ReqName2IPAddress name_to_ipaddress;
 #endif
  } data;
 } PrvRequest;
 /* helper response structs */
 typedef struct {
  struct timeval tv;
 } ResAdjustTime;
 #ifdef PRIVOPS_ADJUSTTIMEX
 typedef struct {
  struct timex tmx;
 } ResAdjustTimex;
 #endif
 typedef struct {
  IPAddr addresses[DNS_MAX_ADDRESSES];
 } ResName2IPAddress;
 typedef struct {
  char msg[256];
 } ResFatalMsg;
 typedef struct {
  int fatal_error;
  int rc;
  int res_errno;
  union {
    ResFatalMsg fatal_msg;
    ResAdjustTime adjust_time;
 #ifdef PRIVOPS_ADJUSTTIMEX
    ResAdjustTimex adjust_timex;
 #endif
 #ifdef PRIVOPS_NAME2IPADDRESS
    ResName2IPAddress name_to_ipaddress;
 #endif
  } data;
 } PrvResponse;
 static int helper_fd;
 static pid_t helper_pid;
 static int
 have_helper(void)
 {
  return helper_fd >= 0;
 }
 /* ======================================================================= */
 /* HELPER - prepare fatal error for daemon */
 static void
 res_fatal(PrvResponse *res, const char *fmt, ...)
 {
  va_list ap;
  res->fatal_error = 1;
  va_start(ap, fmt);
  vsnprintf(res->data.fatal_msg.msg, sizeof (res->data.fatal_msg.msg), fmt, ap);
  va_end(ap);
 }
 /* ======================================================================= */
 /* HELPER - send response to the fd */
 static int
 send_response(int fd, const PrvResponse *res)
 {
  if (send(fd, res, sizeof (*res), 0) != sizeof (*res))
    return 0;
  return 1;
 }
 /* ======================================================================= */
 /* receive daemon request plus optional file descriptor over a unix socket */
 static int
 receive_from_daemon(int fd, PrvRequest *req)
 {
  struct msghdr msg;
  struct cmsghdr *cmsg;
  struct iovec iov;
  char cmsgbuf[256];
  iov.iov_base = req;
  iov.iov_len = sizeof (*req);
  msg.msg_name = NULL;
  msg.msg_namelen = 0;
  msg.msg_iov = &iov;
  msg.msg_iovlen = 1;
  msg.msg_control = (void *)cmsgbuf;
  msg.msg_controllen = sizeof (cmsgbuf);
  msg.msg_flags = MSG_WAITALL;
  /* read the data */
  if (recvmsg(fd, &msg, 0) != sizeof (*req))
    return 0;
  if (req->op == OP_BINDSOCKET) {
    /* extract transferred descriptor */
    req->data.bind_socket.sock = -1;
    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
        memcpy(&req->data.bind_socket.sock, CMSG_DATA(cmsg), sizeof (int));
    }
    /* return error if valid descriptor not found */
    if (req->data.bind_socket.sock < 0)
      return 0;
  }
  return 1;
 }
 /* ======================================================================= */
 /* HELPER - perform adjtime() */
 #ifdef PRIVOPS_ADJUSTTIME
 static void
 do_adjust_time(const ReqAdjustTime *req, PrvResponse *res)
 {
  res->rc = adjtime(&req->tv, &res->data.adjust_time.tv);
  if (res->rc)
    res->res_errno = errno;
 }
 #endif
 /* ======================================================================= */
 /* HELPER - perform ntp_adjtime() */
 #ifdef PRIVOPS_ADJUSTTIMEX
 static void
 do_adjust_timex(const ReqAdjustTimex *req, PrvResponse *res)
 {
  res->data.adjust_timex.tmx = req->tmx;
  res->rc = ntp_adjtime(&res->data.adjust_timex.tmx);
  if (res->rc < 0)
    res->res_errno = errno;
 }
 #endif
 /* ======================================================================= */
 /* HELPER - perform settimeofday() */
 #ifdef PRIVOPS_SETTIME
 static void
 do_set_time(const ReqSetTime *req, PrvResponse *res)
 {
  res->rc = settimeofday(&req->tv, NULL);
  if (res->rc)
    res->res_errno = errno;
 }
 #endif
 /* ======================================================================= */
 /* HELPER - perform bind() */
 #ifdef PRIVOPS_BINDSOCKET
 static void
 do_bind_socket(ReqBindSocket *req, PrvResponse *res)
 {
  unsigned short port;
  IPAddr ip;
  int sock_fd;
  struct sockaddr *sa;
  socklen_t sa_len;
  sa = &req->sa.u;
  sa_len = req->sa_len;
  sock_fd = req->sock;
  UTI_SockaddrToIPAndPort(sa, &ip, &port);
  if (port && port != CNF_GetNTPPort() && port != CNF_GetAcquisitionPort()) {
    close(sock_fd);
    res_fatal(res, "Invalid port %d", port);
    return;
  }
  res->rc = bind(sock_fd, sa, sa_len);
  if (res->rc)
    res->res_errno = errno;
  /* sock is still open on daemon side, but we're done with it in the helper */
  close(sock_fd);
 }
 #endif
 /* ======================================================================= */
 /* HELPER - perform DNS_Name2IPAddress() */
 #ifdef PRIVOPS_NAME2IPADDRESS
 static void
 do_name_to_ipaddress(ReqName2IPAddress *req, PrvResponse *res)
 {
  /* make sure the string is terminated */
  req->name[sizeof (req->name) - 1] = '\0';
  res->rc = DNS_Name2IPAddress(req->name, res->data.name_to_ipaddress.addresses,
                               DNS_MAX_ADDRESSES);
 }
 #endif
 /* ======================================================================= */
 /* HELPER - perform DNS_Reload() */
 #ifdef PRIVOPS_RELOADDNS
 static void
 do_reload_dns(PrvResponse *res)
 {
  DNS_Reload();
  res->rc = 0;
 }
 #endif
 /* ======================================================================= */
 /* HELPER - main loop - action requests from the daemon */
 static void
 helper_main(int fd)
 {
  PrvRequest req;
  PrvResponse res;
  int quit = 0;
  while (!quit) {
    if (!receive_from_daemon(fd, &req))
      /* read error or closed input - we cannot recover - give up */
      break;
    memset(&res, 0, sizeof (res));
    switch (req.op) {
 #ifdef PRIVOPS_ADJUSTTIME
      case OP_ADJUSTTIME:
        do_adjust_time(&req.data.adjust_time, &res);
        break;
 #endif
 #ifdef PRIVOPS_ADJUSTTIMEX
      case OP_ADJUSTTIMEX:
        do_adjust_timex(&req.data.adjust_timex, &res);
        break;
 #endif
 #ifdef PRIVOPS_SETTIME
      case OP_SETTIME:
        do_set_time(&req.data.set_time, &res);
        break;
 #endif
 #ifdef PRIVOPS_BINDSOCKET
      case OP_BINDSOCKET:
        do_bind_socket(&req.data.bind_socket, &res);
        break;
 #endif
 #ifdef PRIVOPS_NAME2IPADDRESS
      case OP_NAME2IPADDRESS:
        do_name_to_ipaddress(&req.data.name_to_ipaddress, &res);
        break;
 #endif
 #ifdef PRIVOPS_RELOADDNS
      case OP_RELOADDNS:
        do_reload_dns(&res);
        break;
 #endif
      case OP_QUIT:
        quit = 1;
        continue;
      default:
        res_fatal(&res, "Unexpected operator %d", req.op);
        break;
    }
    send_response(fd, &res);
  }
  close(fd);
  exit(0);
 }
 /* ======================================================================= */
 /* DAEMON - receive helper response */
 static void
 receive_response(PrvResponse *res)
 {
  int resp_len;
  resp_len = recv(helper_fd, res, sizeof (*res), 0);
  if (resp_len < 0)
    LOG_FATAL("Could not read from helper : %s", strerror(errno));
  if (resp_len != sizeof (*res))
    LOG_FATAL("Invalid helper response");
  if (res->fatal_error)
    LOG_FATAL("Error in helper : %s", res->data.fatal_msg.msg);
  DEBUG_LOG("Received response rc=%d", res->rc);
  /* if operation failed in the helper, set errno so daemon can print log message */
  if (res->res_errno)
    errno = res->res_errno;
 }
 /* ======================================================================= */
 /* DAEMON - send daemon request to the helper */
 static void
 send_request(PrvRequest *req)
 {
  struct msghdr msg;
  struct iovec iov;
  char cmsgbuf[256];
  iov.iov_base = req;
  iov.iov_len = sizeof (*req);
  msg.msg_name = NULL;
  msg.msg_namelen = 0;
  msg.msg_iov = &iov;
  msg.msg_iovlen = 1;
  msg.msg_control = NULL;
  msg.msg_controllen = 0;
  msg.msg_flags = 0;
  if (req->op == OP_BINDSOCKET) {
    /* send file descriptor as a control message */
    struct cmsghdr *cmsg;
    int *ptr_send_fd;
    msg.msg_control = cmsgbuf;
    msg.msg_controllen = CMSG_SPACE(sizeof (int));
    cmsg = CMSG_FIRSTHDR(&msg);
    memset(cmsg, 0, CMSG_SPACE(sizeof (int)));
    cmsg->cmsg_level = SOL_SOCKET;
    cmsg->cmsg_type = SCM_RIGHTS;
    cmsg->cmsg_len = CMSG_LEN(sizeof (int));
    ptr_send_fd = (int *)CMSG_DATA(cmsg);
    *ptr_send_fd = req->data.bind_socket.sock;
  }
  if (sendmsg(helper_fd, &msg, 0) < 0) {
    /* don't try to send another request from exit() */
    helper_fd = -1;
    LOG_FATAL("Could not send to helper : %s", strerror(errno));
  }
  DEBUG_LOG("Sent request op=%d", req->op);
 }
 /* ======================================================================= */
 /* DAEMON - send daemon request and wait for response */
 static void
 submit_request(PrvRequest *req, PrvResponse *res)
 {
  send_request(req);
  receive_response(res);
 }
 /* ======================================================================= */
 /* DAEMON - send the helper a request to exit and wait until it exits */
 static void
 stop_helper(void)
 {
  PrvRequest req;
  int status;
  if (!have_helper())
    return;
  memset(&req, 0, sizeof (req));
  req.op = OP_QUIT;
  send_request(&req);
  waitpid(helper_pid, &status, 0);
 }
 /* ======================================================================= */
 /* DAEMON - request adjtime() */
 #ifdef PRIVOPS_ADJUSTTIME
 int
 PRV_AdjustTime(const struct timeval *delta, struct timeval *olddelta)
 {
  PrvRequest req;
  PrvResponse res;
  if (!have_helper() || delta == NULL)
    /* helper is not running or read adjustment call */
    return adjtime(delta, olddelta);
  memset(&req, 0, sizeof (req));
  req.op = OP_ADJUSTTIME;
  req.data.adjust_time.tv = *delta;
  submit_request(&req, &res);
  if (olddelta)
    *olddelta = res.data.adjust_time.tv;
  return res.rc;
 }
 #endif
 /* ======================================================================= */
 /* DAEMON - request ntp_adjtime() */
 #ifdef PRIVOPS_ADJUSTTIMEX
 int
 PRV_AdjustTimex(struct timex *tmx)
 {
  PrvRequest req;
  PrvResponse res;
  if (!have_helper())
    return ntp_adjtime(tmx);
  memset(&req, 0, sizeof (req));
  req.op = OP_ADJUSTTIMEX;
  req.data.adjust_timex.tmx = *tmx;
  submit_request(&req, &res);
  *tmx = res.data.adjust_timex.tmx;
  return res.rc;
 }
 #endif
 /* ======================================================================= */
 /* DAEMON - request settimeofday() */
 #ifdef PRIVOPS_SETTIME
 int
 PRV_SetTime(const struct timeval *tp, const struct timezone *tzp)
 {
  PrvRequest req;
  PrvResponse res;
  /* only support setting the time */
  assert(tp != NULL);
  assert(tzp == NULL);
  if (!have_helper())
    return settimeofday(tp, NULL);
  memset(&req, 0, sizeof (req));
  req.op = OP_SETTIME;
  req.data.set_time.tv = *tp;
  submit_request(&req, &res);
  return res.rc;
 }
 #endif
 /* ======================================================================= */
 /* DAEMON - request bind() */
 #ifdef PRIVOPS_BINDSOCKET
 int
 PRV_BindSocket(int sock, struct sockaddr *address, socklen_t address_len)
 {
  PrvRequest req;
  PrvResponse res;
  IPAddr ip;
  unsigned short port;
  UTI_SockaddrToIPAndPort(address, &ip, &port);
  if (port && port != CNF_GetNTPPort() && port != CNF_GetAcquisitionPort())
    assert(0);
  if (!have_helper())
    return bind(sock, address, address_len);
  memset(&req, 0, sizeof (req));
  req.op = OP_BINDSOCKET;
  req.data.bind_socket.sock = sock;
  req.data.bind_socket.sa_len = address_len;
  memcpy(&req.data.bind_socket.sa.u, address, address_len);
  submit_request(&req, &res);
  return res.rc;
 }
 #endif
 /* ======================================================================= */
 /* DAEMON - request DNS_Name2IPAddress() */
 #ifdef PRIVOPS_NAME2IPADDRESS
 int
 PRV_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
 {
  PrvRequest req;
  PrvResponse res;
  int i;
  if (!have_helper())
    return DNS_Name2IPAddress(name, ip_addrs, max_addrs);
  memset(&req, 0, sizeof (req));
  req.op = OP_NAME2IPADDRESS;
  if (snprintf(req.data.name_to_ipaddress.name, sizeof (req.data.name_to_ipaddress.name),
               "%s", name) >= sizeof (req.data.name_to_ipaddress.name)) {
    DEBUG_LOG("Name too long");
    return DNS_Failure;
  }
  submit_request(&req, &res);
  for (i = 0; i < max_addrs && i < DNS_MAX_ADDRESSES; i++)
    ip_addrs[i] = res.data.name_to_ipaddress.addresses[i];
  return res.rc;
 }
 #endif
 /* ======================================================================= */
 /* DAEMON - request res_init() */
 #ifdef PRIVOPS_RELOADDNS
 void
 PRV_ReloadDNS(void)
 {
  PrvRequest req;
  PrvResponse res;
  if (!have_helper()) {
    DNS_Reload();
    return;
  }
  memset(&req, 0, sizeof (req));
  req.op = OP_RELOADDNS;
  submit_request(&req, &res);
  assert(!res.rc);
 }
 #endif
 /* ======================================================================= */
 void
 PRV_Initialise(void)
 {
  helper_fd = -1;
 }
 /* ======================================================================= */
 /* DAEMON - setup socket(s) then fork to run the helper */
 /* must be called before privileges are dropped */
 void
 PRV_StartHelper(void)
 {
  pid_t pid;
  int fd, sock_pair[2];
  if (have_helper())
    LOG_FATAL("Helper already running");
  if (
 #ifdef SOCK_SEQPACKET
      socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock_pair) &&
 #endif
      socketpair(AF_UNIX, SOCK_DGRAM, 0, sock_pair))
    LOG_FATAL("socketpair() failed : %s", strerror(errno));
  UTI_FdSetCloexec(sock_pair[0]);
  UTI_FdSetCloexec(sock_pair[1]);
  pid = fork();
  if (pid < 0)
    LOG_FATAL("fork() failed : %s", strerror(errno));
  if (pid == 0) {
    /* child process */
    close(sock_pair[0]);
    /* close other descriptors inherited from the parent process */
    for (fd = 0; fd < 1024; fd++) {
      if (fd != sock_pair[1])
        close(fd);
    }
    /* ignore signals, the process will exit on OP_QUIT request */
    UTI_SetQuitSignalsHandler(SIG_IGN, 1);
    helper_main(sock_pair[1]);
  } else {
    /* parent process */
    close(sock_pair[1]);
    helper_fd = sock_pair[0];
    helper_pid = pid;
    /* stop the helper even when not exiting cleanly from the main function */
    atexit(stop_helper);
  }
 }
 /* ======================================================================= */
 /* DAEMON - graceful shutdown of the helper */
 void
 PRV_Finalise(void)
 {
  if (!have_helper())
    return;
  stop_helper();
  close(helper_fd);
  helper_fd = -1;
 }
--- a/privops.h
+++ b/privops.h
@@ -1,77 +0,0 @@
 /*
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
 * Copyright (C) Bryan Christianson 2015
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 **********************************************************************
  =======================================================================
  Perform privileged operations over a unix socket to a privileged fork.
 */
 #ifndef GOT_PRIVOPS_H
 #define GOT_PRIVOPS_H
 #ifdef PRIVOPS_ADJUSTTIME
 int PRV_AdjustTime(const struct timeval *delta, struct timeval *olddelta);
 #else
 #define PRV_AdjustTime adjtime
 #endif
 #ifdef PRIVOPS_ADJUSTTIMEX
 int PRV_AdjustTimex(struct timex *txc);
 #else
 #define PRV_AdjustTimex ntp_adjtime
 #endif
 #ifdef PRIVOPS_SETTIME
 int PRV_SetTime(const struct timeval *tp, const struct timezone *tzp);
 #else
 #define PRV_SetTime settimeofday
 #endif
 #ifdef PRIVOPS_BINDSOCKET
 int PRV_BindSocket(int sock, struct sockaddr *address, socklen_t address_len);
 #else
 #define PRV_BindSocket bind
 #endif
 #ifdef PRIVOPS_NAME2IPADDRESS
 int PRV_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs);
 #else
 #define PRV_Name2IPAddress DNS_Name2IPAddress
 #endif
 #ifdef PRIVOPS_RELOADDNS
 void PRV_ReloadDNS(void);
 #else
 #define PRV_ReloadDNS DNS_Reload
 #endif
 #ifdef PRIVOPS_HELPER
 void PRV_Initialise(void);
 void PRV_StartHelper(void);
 void PRV_Finalise(void);
 #else
 #define PRV_Initialise()
 #define PRV_StartHelper()
 #define PRV_Finalise()
 #endif
 #endif
--- a/refclock.c
+++ b/refclock.c
--- a/refclock.h
+++ b/refclock.h
@@ -37,21 +37,14 @@ typedef struct {
  int driver_poll;
  int poll;
  int filter_length;
  int pps_forced;
  int pps_rate;
  int min_samples;
  int max_samples;
  int sel_options;
  int max_lock_age;
  int stratum;
  int tai;
  uint32_t ref_id;
  uint32_t lock_ref_id;
  double offset;
  double delay;
  double precision;
  double max_dispersion;
-  double pulse_width;
+  SRC_SelectOption sel_option;
 } RefclockParameters;
 typedef struct RCL_Instance_Record *RCL_Instance;
@@ -66,19 +59,14 @@ extern void RCL_Initialise(void);
 extern void RCL_Finalise(void);
 extern int RCL_AddRefclock(RefclockParameters *params);
 extern void RCL_StartRefclocks(void);
-extern void RCL_ReportSource(RPT_SourceReport *report, struct timespec *now);
+extern void RCL_ReportSource(RPT_SourceReport *report, struct timeval *now);
 /* functions used by drivers */
 extern void RCL_SetDriverData(RCL_Instance instance, void *data);
 extern void *RCL_GetDriverData(RCL_Instance instance);
 extern char *RCL_GetDriverParameter(RCL_Instance instance);
 extern void RCL_CheckDriverOptions(RCL_Instance instance, const char **options);
 extern char *RCL_GetDriverOption(RCL_Instance instance, char *name);
-extern int RCL_AddSample(RCL_Instance instance, struct timespec *sample_time, double offset, int leap);
+extern int RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset, int leap);
-extern int RCL_AddPulse(RCL_Instance instance, struct timespec *pulse_time, double second);
+extern int RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second);
 extern int RCL_AddCookedPulse(RCL_Instance instance, struct timespec *cooked_time,
                              double second, double dispersion, double raw_correction);
 extern double RCL_GetPrecision(RCL_Instance instance);
 extern int RCL_GetDriverPoll(RCL_Instance instance);
 #endif
--- a/refclock_phc.c
+++ b/refclock_phc.c
@@ -2,7 +2,7 @@
  chronyd/chronyc - Programs for keeping computer clocks accurate.
 **********************************************************************
- * Copyright (C) Miroslav Lichvar  2013, 2017
+ * Copyright (C) Miroslav Lichvar  2013
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
@@ -33,137 +33,151 @@
 #include "sysincl.h"
-#include "refclock.h"
+#include <linux/ptp_clock.h>
 #include "hwclock.h"
 #include "local.h"
 #include "logging.h"
 #include "memory.h"
 #include "util.h"
 #include "sched.h"
 #include "sys_linux.h"
-struct phc_instance {
+#include "refclock.h"
-  int fd;
+#include "logging.h"
-  int mode;
+#include "util.h"
-  int nocrossts;
+
-  int extpps;
+/* From linux/include/linux/posix-timers.h */
-  int pin;
+#define CPUCLOCK_MAX            3
-  int channel;
+#define CLOCKFD                 CPUCLOCK_MAX
-  HCL_Instance clock;
+#define CLOCKFD_MASK            (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
 #define FD_TO_CLOCKID(fd)       ((~(clockid_t) (fd) << 3) | CLOCKFD)
 #define NUM_READINGS 10
 static int no_sys_offset_ioctl = 0;
 struct phc_reading {
  struct timespec sys_ts1;
  struct timespec phc_ts;;
  struct timespec sys_ts2;
 };
-static void read_ext_pulse(int sockfd, int event, void *anything);
+static double diff_ts(struct timespec *ts1, struct timespec *ts2)
 static int phc_initialise(RCL_Instance instance)
 {
-  const char *options[] = {"nocrossts", "extpps", "pin", "channel", "clear", NULL};
+  return (ts1->tv_sec - ts2->tv_sec) + (ts1->tv_nsec - ts2->tv_nsec) / 1e9;
-  struct phc_instance *phc;
+}
  int phc_fd, rising_edge;
  char *path, *s;
-  RCL_CheckDriverOptions(instance, options);
+static int read_phc_ioctl(struct phc_reading *readings, int phc_fd, int n)
 {
 #if defined(PTP_SYS_OFFSET) && NUM_READINGS <= PTP_MAX_SAMPLES
  struct ptp_sys_offset sys_off;
  int i;
-  path = RCL_GetDriverParameter(instance);
+  /* Silence valgrind */
  memset(&sys_off, 0, sizeof (sys_off));
-  phc_fd = SYS_Linux_OpenPHC(path, 0);
+  sys_off.n_samples = n;
-  if (phc_fd < 0) {
+  if (ioctl(phc_fd, PTP_SYS_OFFSET, &sys_off)) {
-    LOG_FATAL("Could not open PHC");
+    LOG(LOGS_ERR, LOGF_Refclock, "ioctl(PTP_SYS_OFFSET) failed : %s", strerror(errno));
    return 0;
  }
-  phc = MallocNew(struct phc_instance);
+  for (i = 0; i < n; i++) {
-  phc->fd = phc_fd;
+    readings[i].sys_ts1.tv_sec = sys_off.ts[i * 2].sec;
-  phc->mode = 0;
+    readings[i].sys_ts1.tv_nsec = sys_off.ts[i * 2].nsec;
-  phc->nocrossts = RCL_GetDriverOption(instance, "nocrossts") ? 1 : 0;
+    readings[i].phc_ts.tv_sec = sys_off.ts[i * 2 + 1].sec;
-  phc->extpps = RCL_GetDriverOption(instance, "extpps") ? 1 : 0;
+    readings[i].phc_ts.tv_nsec = sys_off.ts[i * 2 + 1].nsec;
-
+    readings[i].sys_ts2.tv_sec = sys_off.ts[i * 2 + 2].sec;
-  if (phc->extpps) {
+    readings[i].sys_ts2.tv_nsec = sys_off.ts[i * 2 + 2].nsec;
    s = RCL_GetDriverOption(instance, "pin");
    phc->pin = s ? atoi(s) : 0;
    s = RCL_GetDriverOption(instance, "channel");
    phc->channel = s ? atoi(s) : 0;
    rising_edge = RCL_GetDriverOption(instance, "clear") ? 0 : 1;
    phc->clock = HCL_CreateInstance(0, 16, UTI_Log2ToDouble(RCL_GetDriverPoll(instance)));
    if (!SYS_Linux_SetPHCExtTimestamping(phc->fd, phc->pin, phc->channel,
                                         rising_edge, !rising_edge, 1))
      LOG_FATAL("Could not enable external PHC timestamping");
    SCH_AddFileHandler(phc->fd, SCH_FILE_INPUT, read_ext_pulse, instance);
  } else {
    phc->pin = phc->channel = 0;
    phc->clock = NULL;
  }
-  RCL_SetDriverData(instance, phc);
+  return 1;
 #else
  /* Not available */
  return 0;
 #endif
 }
 static int read_phc_user(struct phc_reading *readings, int phc_fd, int n)
 {
  clockid_t phc_id;
  int i;
  phc_id = FD_TO_CLOCKID(phc_fd);
  for (i = 0; i < n; i++) {
    if (clock_gettime(CLOCK_REALTIME, &readings[i].sys_ts1) ||
        clock_gettime(phc_id, &readings[i].phc_ts) ||
        clock_gettime(CLOCK_REALTIME, &readings[i].sys_ts2)) {
      LOG(LOGS_ERR, LOGF_Refclock, "clock_gettime() failed : %s", strerror(errno));
      return 0;
    }
  }
  return 1;
 }
 static int phc_initialise(RCL_Instance instance)
 {
  struct ptp_clock_caps caps;
  int phc_fd;
  char *path;
  path = RCL_GetDriverParameter(instance);
  phc_fd = open(path, O_RDONLY);
  if (phc_fd < 0) {
    LOG_FATAL(LOGF_Refclock, "open() failed on %s", path);
    return 0;
  }
  /* Make sure it is a PHC */
  if (ioctl(phc_fd, PTP_CLOCK_GETCAPS, &caps)) {
    LOG_FATAL(LOGF_Refclock, "ioctl(PTP_CLOCK_GETCAPS) failed : %s", strerror(errno));
    return 0;
  }
  UTI_FdSetCloexec(phc_fd);
  RCL_SetDriverData(instance, (void *)(long)phc_fd);
  return 1;
 }
 static void phc_finalise(RCL_Instance instance)
 {
-  struct phc_instance *phc;
+  close((long)RCL_GetDriverData(instance));
  phc = (struct phc_instance *)RCL_GetDriverData(instance);
  if (phc->extpps) {
    SCH_RemoveFileHandler(phc->fd);
    SYS_Linux_SetPHCExtTimestamping(phc->fd, phc->pin, phc->channel, 0, 0, 0);
    HCL_DestroyInstance(phc->clock);
  }
  close(phc->fd);
  Free(phc);
 }
 static void read_ext_pulse(int fd, int event, void *anything)
 {
  RCL_Instance instance;
  struct phc_instance *phc;
  struct timespec phc_ts, local_ts;
  double local_err;
  int channel;
  instance = anything;
  phc = RCL_GetDriverData(instance);
  if (!SYS_Linux_ReadPHCExtTimestamp(phc->fd, &phc_ts, &channel))
    return;
  if (channel != phc->channel) {
    DEBUG_LOG("Unexpected extts channel %d\n", channel);
    return;
  }
  if (!HCL_CookTime(phc->clock, &phc_ts, &local_ts, &local_err))
    return;
  RCL_AddCookedPulse(instance, &local_ts, 1.0e-9 * local_ts.tv_nsec, local_err,
                     UTI_DiffTimespecsToDouble(&phc_ts, &local_ts));
 }
 static int phc_poll(RCL_Instance instance)
 {
-  struct phc_instance *phc;
+  struct phc_reading readings[NUM_READINGS];
-  struct timespec phc_ts, sys_ts, local_ts;
+  struct timeval tv;
-  double offset, phc_err, local_err;
+  double offset = 0.0, delay, best_delay = 0.0;
  int i, phc_fd, best;
-  phc = (struct phc_instance *)RCL_GetDriverData(instance);
+  phc_fd = (long)RCL_GetDriverData(instance);
-  if (!SYS_Linux_GetPHCSample(phc->fd, phc->nocrossts, RCL_GetPrecision(instance),
+  if (!no_sys_offset_ioctl) {
-                              &phc->mode, &phc_ts, &sys_ts, &phc_err))
+    if (!read_phc_ioctl(readings, phc_fd, NUM_READINGS)) {
      no_sys_offset_ioctl = 1;
      return 0;
-
+    }
-  if (phc->extpps) {
+  } else {
-    LCL_CookTime(&sys_ts, &local_ts, &local_err);
+    if (!read_phc_user(readings, phc_fd, NUM_READINGS))
    HCL_AccumulateSample(phc->clock, &phc_ts, &local_ts, phc_err + local_err);
      return 0;
  }
-  offset = UTI_DiffTimespecsToDouble(&phc_ts, &sys_ts);
+  /* Find the fastest reading */
  for (i = 0; i < NUM_READINGS; i++) {
    delay = diff_ts(&readings[i].sys_ts2, &readings[i].sys_ts1);
-  DEBUG_LOG("PHC offset: %+.9f err: %.9f", offset, phc_err);
+    if (!i || best_delay > delay) {
      best = i;
      best_delay = delay;
    }
  }
-  return RCL_AddSample(instance, &sys_ts, offset, LEAP_Normal);
+  offset = diff_ts(&readings[best].phc_ts, &readings[best].sys_ts2) + best_delay / 2.0;
  tv.tv_sec = readings[best].sys_ts2.tv_sec;
  tv.tv_usec = readings[best].sys_ts2.tv_nsec / 1000;
  DEBUG_LOG(LOGF_Refclock, "PHC offset: %+.9f delay: %.9f", offset, best_delay);
  return RCL_AddSample(instance, &tv, offset, LEAP_Normal);
 }
 RefclockDriver RCL_PHC_driver = {
--- a/refclock_pps.c
+++ b/refclock_pps.c
@@ -29,7 +29,7 @@
 #include "refclock.h"
-#if FEAT_PPS
+#if HAVE_PPSAPI
 #if defined(HAVE_SYS_TIMEPPS_H)
 #include <sys/timepps.h>
@@ -48,51 +48,48 @@ struct pps_instance {
 };
 static int pps_initialise(RCL_Instance instance) {
  const char *options[] = {"clear", NULL};
  pps_handle_t handle;
  pps_params_t params;
  struct pps_instance *pps;
  int fd, edge_clear, mode;
  char *path;
  RCL_CheckDriverOptions(instance, options);
  path = RCL_GetDriverParameter(instance);
  edge_clear = RCL_GetDriverOption(instance, "clear") ? 1 : 0;
  fd = open(path, O_RDWR);
  if (fd < 0) {
-    LOG_FATAL("Could not open %s : %s", path, strerror(errno));
+    LOG_FATAL(LOGF_Refclock, "open() failed on %s", path);
    return 0;
  }
  UTI_FdSetCloexec(fd);
  if (time_pps_create(fd, &handle) < 0) {
-    LOG_FATAL("time_pps_create() failed on %s : %s", path, strerror(errno));
+    LOG_FATAL(LOGF_Refclock, "time_pps_create() failed on %s", path);
    return 0;
  }
  if (time_pps_getcap(handle, &mode) < 0) {
-    LOG_FATAL("time_pps_getcap() failed on %s : %s", path, strerror(errno));
+    LOG_FATAL(LOGF_Refclock, "time_pps_getcap() failed on %s", path);
    return 0;
  }
  if (time_pps_getparams(handle, &params) < 0) {
-    LOG_FATAL("time_pps_getparams() failed on %s : %s", path, strerror(errno));
+    LOG_FATAL(LOGF_Refclock, "time_pps_getparams() failed on %s", path);
    return 0;
  }
  if (!edge_clear) {
    if (!(mode & PPS_CAPTUREASSERT)) {
-      LOG_FATAL("CAPTUREASSERT not supported on %s", path);
+      LOG_FATAL(LOGF_Refclock, "CAPTUREASSERT not supported on %s", path);
      return 0;
    }
    params.mode |= PPS_CAPTUREASSERT;
    params.mode &= ~PPS_CAPTURECLEAR;
  } else {
    if (!(mode & PPS_CAPTURECLEAR)) {
-      LOG_FATAL("CAPTURECLEAR not supported on %s", path);
+      LOG_FATAL(LOGF_Refclock, "CAPTURECLEAR not supported on %s", path);
      return 0;
    }
    params.mode |= PPS_CAPTURECLEAR;
@@ -100,7 +97,7 @@ static int pps_initialise(RCL_Instance instance) {
  }
  if (time_pps_setparams(handle, &params) < 0) {
-    LOG_FATAL("time_pps_setparams() failed on %s : %s", path, strerror(errno));
+    LOG_FATAL(LOGF_Refclock, "time_pps_setparams() failed on %s", path);
    return 0;
  }
@@ -127,6 +124,7 @@ static int pps_poll(RCL_Instance instance)
 {
  struct pps_instance *pps; 
  struct timespec ts;
  struct timeval tv;
  pps_info_t pps_info;
  pps_seq_t seq;
@@ -136,7 +134,7 @@ static int pps_poll(RCL_Instance instance)
  ts.tv_nsec = 0;
  if (time_pps_fetch(pps->handle, PPS_TSFMT_TSPEC, &pps_info, &ts) < 0) {
-    LOG(LOGS_ERR, "time_pps_fetch() failed : %s", strerror(errno));
+    LOG(LOGS_ERR, LOGF_Refclock, "time_pps_fetch() failed : %s", strerror(errno));
    return 0;
  }
@@ -148,15 +146,17 @@ static int pps_poll(RCL_Instance instance)
    ts = pps_info.clear_timestamp;
  }
-  if (seq == pps->last_seq || UTI_IsZeroTimespec(&ts)) {
+  if (seq == pps->last_seq || (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 
-    DEBUG_LOG("PPS sample ignored seq=%lu ts=%s",
+    DEBUG_LOG(LOGF_Refclock, "PPS sample ignored seq=%lu ts=%lu.%09lu",
-              (unsigned long)seq, UTI_TimespecToString(&ts));
+        seq, ts.tv_sec, ts.tv_nsec);
    return 0;
  }
  pps->last_seq = seq;
  tv.tv_sec = ts.tv_sec;
  tv.tv_usec = ts.tv_nsec / 1000;
-  return RCL_AddPulse(instance, &ts, 1.0e-9 * ts.tv_nsec);
+  return RCL_AddPulse(instance, &tv, ts.tv_nsec / 1e9);
 }
 RefclockDriver RCL_PPS_driver = {
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Miroslav Lichvar	aabb564320	doc: update NEWS	2016-01-19 08:15:15 +01:00
Miroslav Lichvar	df46e5ca5d	ntp: restrict authentication of server/peer to specified key When a server/peer was specified with a key number to enable authentication with a symmetric key, packets received from the server/peer were accepted if they were authenticated with any of the keys contained in the key file and not just the specified key. This allowed an attacker who knew one key of a client/peer to modify packets from its servers/peers that were authenticated with other keys in a man-in-the-middle (MITM) attack. For example, in a network where each NTP association had a separate key and all hosts had only keys they needed, a client of a server could not attack other clients of the server, but it could attack the server and also attack its own clients (i.e. modify packets from other servers). To not allow the server/peer to be authenticated with other keys extend the authentication test to check if the key ID in the received packet is equal to the configured key number. As a consequence, it's no longer possible to authenticate two peers to each other with two different keys, both peers have to be configured to use the same key. This issue was discovered by Matt Street of Cisco ASIG.	2016-01-19 08:15:12 +01:00
Miroslav Lichvar	370ba5e8fc	doc: warn that unauthenticated peers are vulnerable to DoS attack	2016-01-19 08:14:46 +01:00
Miroslav Lichvar	463093803d	doc: fix CVE-ID in NEWS CVE-2015-1853 is for chrony, CVE-2015-1799 is for ntp.	2015-04-08 08:47:13 +02:00
Miroslav Lichvar	c4bedce1f4	doc: update NEWS	2015-04-07 16:35:16 +02:00
Miroslav Lichvar	79eacdb7e6	cmdmon: fix initialization of allocated reply slots When allocating memory to save unacknowledged replies to authenticated command requests, the last "next" pointer was not initialized to NULL. When all allocated reply slots were used, the next reply could be written to an invalid memory instead of allocating a new slot for it. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could exploit this to crash chronyd or possibly execute arbitrary code with the privileges of the chronyd process.	2015-04-07 16:35:16 +02:00
Miroslav Lichvar	cf19042ecb	addrfilt: fix access configuration with subnet size indivisible by 4 When NTP or cmdmon access was configured (from chrony.conf or via authenticated cmdmon) with a subnet size that is indivisible by 4 and an address that has nonzero bits in the 4-bit subnet remainder (e.g. 192.168.15.0/22 or f000::/3), the new setting was written to an incorrect location, possibly outside the allocated array. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could exploit this to crash chronyd or possibly execute arbitrary code with the privileges of the chronyd process.	2015-04-07 16:35:16 +02:00
Miroslav Lichvar	d856bd34c4	ntp: protect authenticated symmetric associations against DoS attacks An attacker knowing that NTP hosts A and B are peering with each other (symmetric association) can send a packet with random timestamps to host A with source address of B which will set the NTP state variables on A to the values sent by the attacker. Host A will then send on its next poll to B a packet with originate timestamp that doesn't match the transmit timestamp of B and the packet will be dropped. If the attacker does this periodically for both hosts, they won't be able to synchronize to each other. It is a denial-of-service attack. According to [1], NTP authentication is supposed to protect symmetric associations against this attack, but in the NTPv3 (RFC 1305) and NTPv4 (RFC 5905) specifications the state variables are updated before the authentication check is performed, which means the association is vulnerable to the attack even when authentication is enabled. To fix this problem, save the originate and local timestamps only when the authentication check (test5) passed. [1] https://www.eecis.udel.edu/~mills/onwire.html	2015-04-07 16:34:42 +02:00