doc: update NEWS

Accept HW timestamp only if it doesn't differ from the kernel/daemon
timestamp by more than one second.

.gitignore

@@ -7,17 +7,15 @@
 tags
 /RELEASES
 /Makefile
-/chrony.conf.5
-/chrony.info
-/chrony.html
-/chrony.texi
-/chrony.txt
 /chronyc
-/chronyc.1
 /chronyd
-/chronyd.8
 /config.h
 /config.log
+/doc/Makefile
+/doc/*.html
+/doc/*.man
+/doc/*.man.in
+/doc/*.txt
 /getdate.c
 /version.h
 /test/simulation/clknetsim

Makefile.in

@@ -24,9 +24,6 @@
 SYSCONFDIR=@SYSCONFDIR@
 BINDIR=@BINDIR@
 SBINDIR=@SBINDIR@
-MANDIR=@MANDIR@
-INFODIR=@INFODIR@
-DOCDIR=@DOCDIR@
 LOCALSTATEDIR=@LOCALSTATEDIR@
 CHRONYVARDIR=@CHRONYVARDIR@
 
@@ -66,19 +63,14 @@ 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
 	-rm -f .DS_Store
-	-rm -f Makefile
-	-rm -f chrony.conf.5 chrony.texi chronyc.1 chronyd.8
+	-rm -f Makefile config.h config.log
+	$(MAKE) -C doc distclean
+	$(MAKE) -C test/unit distclean
 
 clean :
-	-rm -f *.o *.s chronyc chronyd core *~ chrony.info chrony.html chrony.txt
+	-rm -f *.o *.s chronyc chronyd core *~
 	-rm -rf .deps
 	-rm -rf *.dSYM
 
@@ -96,9 +88,6 @@ install: chronyd chronyc
 	[ -d $(DESTDIR)$(SYSCONFDIR) ] || mkdir -p $(DESTDIR)$(SYSCONFDIR)
 	[ -d $(DESTDIR)$(SBINDIR) ] || mkdir -p $(DESTDIR)$(SBINDIR)
 	[ -d $(DESTDIR)$(BINDIR) ] || mkdir -p $(DESTDIR)$(BINDIR)
-	[ -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 $(DESTDIR)$(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
@@ -106,12 +95,13 @@ install: chronyd chronyc
 	chmod 755 $(DESTDIR)$(SBINDIR)/chronyd
 	cp chronyc $(DESTDIR)$(BINDIR)/chronyc
 	chmod 755 $(DESTDIR)$(BINDIR)/chronyc
-	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
+	$(MAKE) -C doc install
+
+docs :
+	$(MAKE) -C doc docs
+
+install-docs :
+	$(MAKE) -C doc install-docs
 
 %.o : %.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
@@ -123,28 +113,6 @@ check : chronyd chronyc
 	$(MAKE) -C test/unit check
 	cd test/simulation && ./run
 
-install-docs : docs
-	[ -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*
-
-docs : chrony.txt chrony.html chrony.info
-
-chrony.txt : chrony.texi
-	makeinfo --no-headers --number-sections -o chrony.txt chrony.texi
-
-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
-
 Makefile : Makefile.in configure
 	@echo
 	@echo Makefile needs to be regenerated, run ./configure

NEWS

@@ -1,3 +1,74 @@
+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
 ==================
 

README

@@ -14,10 +14,10 @@ intermittent network connections, heavily congested networks, changing
 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 on a LAN is in tens, or a few
-hundreds, of microseconds; over the Internet, accuracy is typically
-within a few milliseconds.  With a good hardware reference clock
-sub-microsecond accuracy is possible.
+Typical accuracy between two machines synchronised over the Internet is
+within a few milliseconds; on a LAN, accuracy is typically in tens of
+microseconds.  With hardware timestamping or a hardware reference clock
+sub-microsecond accuracy may be possible.
 
 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
@@ -27,7 +27,7 @@ operating parameters whilst it is running.
 What will chrony run on?
 ========================
 
-The software is known to work on Linux, FreeBSD, NetBSD, Mac OS X and
+The software is known to work on Linux, FreeBSD, NetBSD, macOS and
 Solaris.  Closely related systems may work too.  Any other system will
 likely require a porting exercise.  You would need to start from one
 of the existing system-specific drivers and look into the quirks of
@@ -53,7 +53,7 @@ ready-formatted plain text (chrony.txt) in the distribution.
 There is also information available on the chrony web pages, accessible
 through the URL 
 
-    http://chrony.tuxfamily.org/
+    https://chrony.tuxfamily.org/
 
 Where are new versions announced?
 =================================
@@ -84,30 +84,36 @@ 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
 =======
 
 chrony is distributed under the GNU General Public License version 2.
 
-
-Author
-======
+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>
+    Patch to add tab-completion to chronyc
+
 Benny Lyne Amorsen <benny@amorsen.dk>
     Patch to add minstratum option
 
@@ -129,8 +135,9 @@ Erik Bryer <ebryer@spots.ab.ca>
     Entries in contrib directory
 
 Bryan Christianson <bryan@whatroute.net>
-    Support for Mac OS X
+    Support for macOS
     Support for privilege separation
+    Entries in contrib directory
 
 Juliusz Chroboczek <jch@pps.jussieu.fr>
     Fix install rule in Makefile if chronyd file is in use.
@@ -187,18 +194,6 @@ Jim Knoble <jmknoble@pobox.com>
 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
 
@@ -217,6 +212,12 @@ Andreas Piesk <apiesk@virbus.de>
 Timo Teras <timo.teras@iki.fi>
     Patch to reply correctly on multihomed hosts
 
+Bill Unruh <unruh@physics.ubc.ca>
+    Advice on statistics
+
+Stephen Wadeley <swadeley@redhat.com>
+    Improvements to man pages
+
 Wolfgang Weisselberg <weissel@netcologne.de>
     Entries in contrib directory
 
@@ -230,5 +231,5 @@ Ulrich Windl <ulrich.windl@rz.uni-regensburg.de> for the
 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.
+Many other people have contributed bug reports and suggestions.  We are sorry
+we cannot identify all of you individually.

addressing.h

@@ -42,6 +42,7 @@ typedef struct {
     uint8_t in6[16];
   } addr;
   uint16_t family;
+  uint16_t _pad;
 } IPAddr;
 
 typedef struct {

candm.h

@@ -93,18 +93,18 @@
 #define REQ_REFRESH 53
 #define REQ_SERVER_STATS 54
 #define REQ_CLIENT_ACCESSES_BY_INDEX2 55
-#define N_REQUEST_TYPES 56
+#define REQ_LOCAL2 56
+#define REQ_NTP_DATA 57
+#define REQ_ADD_SERVER2 58
+#define REQ_ADD_PEER2 59
+#define N_REQUEST_TYPES 60
 
-/* 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 */
+/* Structure used to exchange timespecs independent of time_t size */
 typedef struct {
   uint32_t tv_sec_high;
   uint32_t tv_sec_low;
   uint32_t tv_nsec;
-} Timeval;
+} Timespec;
 
 /* This is used in tv_sec_high for 32-bit timestamps */
 #define TV_NOHIGHSEC 0x7fffffff
@@ -203,18 +203,20 @@ typedef struct {
 } REQ_Modify_Makestep;
 
 typedef struct {
-  Timeval ts;
+  Timespec ts;
   int32_t EOR;
 } REQ_Logon;
 
 typedef struct {
-  Timeval ts;
+  Timespec 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;
 
@@ -247,6 +249,7 @@ typedef struct {
 #define REQ_ADDSRC_NOSELECT 0x10
 #define REQ_ADDSRC_TRUST 0x20
 #define REQ_ADDSRC_REQUIRE 0x40
+#define REQ_ADDSRC_INTERLEAVED 0x80
 
 typedef struct {
   IPAddr ip_addr;
@@ -254,9 +257,17 @@ 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 offset;
   uint32_t flags;
   int32_t EOR;
 } REQ_NTP_Source;
@@ -310,6 +321,11 @@ typedef struct {
   int32_t EOR;
 } REQ_SmoothTime;
 
+typedef struct {
+  IPAddr ip_addr;
+  int32_t EOR;
+} REQ_NTPData;
+
 /* ================================================== */
 
 #define PKT_TYPE_CMD_REQUEST 1
@@ -346,8 +362,8 @@ typedef struct {
    domain socket.
 
    Version 6 (no authentication) : changed format of client accesses by index
-   (using new request/reply types), new flags in NTP source request and report,
-   new commands: refresh, serverstats
+   (using new request/reply types), new fields and flags in NTP source request
+   and report, new commands: ntpdata, refresh, serverstats
  */
 
 #define PROTO_VERSION_NUMBER 6
@@ -410,6 +426,7 @@ typedef struct {
     REQ_ManualDelete manual_delete;
     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
@@ -443,7 +460,8 @@ typedef struct {
 #define RPY_SMOOTHING 13
 #define RPY_SERVER_STATS 14
 #define RPY_CLIENT_ACCESSES_BY_INDEX2 15
-#define N_REPLY_TYPES 16
+#define RPY_NTP_DATA 16
+#define N_REPLY_TYPES 17
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -513,7 +531,7 @@ typedef struct {
   IPAddr ip_addr;
   uint16_t stratum;
   uint16_t leap_status;
-  Timeval ref_time;
+  Timespec ref_time;
   Float current_correction;
   Float last_offset;
   Float rms_offset;
@@ -541,7 +559,7 @@ typedef struct {
 } RPY_Sourcestats;
 
 typedef struct {
-  Timeval ref_time;
+  Timespec ref_time;
   uint16_t n_samples;
   uint16_t n_runs;
   uint32_t span_seconds;
@@ -591,7 +609,7 @@ typedef struct {
 #define MAX_MANUAL_LIST_SAMPLES 16
 
 typedef struct {
-  Timeval when;
+  Timespec when;
   Float slewed_offset;
   Float orig_offset;
   Float residual;
@@ -625,6 +643,39 @@ typedef struct {
   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;
@@ -653,6 +704,7 @@ typedef struct {
     RPY_ManualList manual_list;
     RPY_Activity activity;
     RPY_Smoothing smoothing;
+    RPY_NTPData ntp_data;
   } data; /* Reply specific parameters */
 
 } CMD_Reply;

chrony.conf.5.in

@@ -1,67 +0,0 @@
-.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 `foo.example.net', `bar.example.net' and `baz.example.net',
-your \fBchrony.conf\fR file could contain as a minimum
-
-.EX
-     server foo.example.net
-     server bar.example.net
-     server baz.example.net
-.EE
-
-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',  `makestep', `rtcsync'.  Also, the `iburst'
-server option is useful to speed up the initial synchronization.  The smallest
-useful configuration file would look something like
-
-.EX
-     server foo.example.net iburst
-     server bar.example.net iburst
-     server baz.example.net iburst
-     driftfile @CHRONYVARDIR@/drift
-     makestep 1.0 3
-     rtcsync
-.EE
-
-When using a pool of NTP servers (one name is used for multiple servers which
-may change over time), it's better to specify them with the `pool' directive
-instead of multiple `server' directives.  The configuration file could in this
-case look like
-
-.EX
-     pool pool.ntp.org iburst
-     driftfile @CHRONYVARDIR@/drift
-     makestep 1.0 3
-     rtcsync
-.EE
-
-.SH "SEE ALSO"
-.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.
-

chronyc.1.in

@@ -1,74 +0,0 @@
-.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 or comma-separated list of addresses
-(default @CHRONYSOCKDIR@/chronyd.sock,127.0.0.1,::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\-d\fR
-print debugging messages (if compiled with debugging support)
-.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 is ignored and is provided only for compatibility.
-.TP
-\fB\-a\fR
-this option is ignored and is provided only for compatibility.
-.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)
-
-.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.

chronyd.8.in

@@ -1,166 +0,0 @@
-.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
-On Linux, this option will select the SCHED_FIFO real-time scheduler at the
-specified priority (which must be between 0 and 100).  On Mac OS X, 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.
-.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 should be used only on
-systems where the kernel can maintain clock compensation whilst not under
-\fBchronyd\fR's control (i.e. Linux, FreeBSD, NetBSD and Solaris).
-.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 or
-to the last modification time of the file specified by the \fIdriftfile\fR
-directive.  Real-time clocks are supported only on Linux.
-
-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 the last modification time of the drift file is later than the current time
-and the RTC time, the system time will be set to it to restore the time when
-\fBchronyd\fR was previously stopped.  This is useful on computers that have no
-RTC or the RTC is broken (e.g. it has no battery).
-.TP
-\fB\-u\fR \fIuser\fR
-This option sets the name of the system user to which \fBchronyd\fR will switch
-after start in order to drop root privileges.  It overrides the \fBuser\fR
-directive from the configuration file (default \fB@DEFAULT_USER@\fR).
-
-On Linux, \fBchronyd\fR needs to be compiled with support for the \fBlibcap\fR
-library.  On Mac OS X, FreeBSD, NetBSD and Solaris \fBchronyd\fR 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.
-.TP
-\fB\-F\fR \fIlevel\fR
-This option configures a system call filter when \fBchronyd\fR 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 SYSSIG
-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 \fBchrony\fR is installed as the filter needs to
-allow also system calls made from libraries that \fBchronyd\fR 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,
-\fBchronyd\fR could be killed even in normal operation.
-.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 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.
-

clientlog.c

@@ -39,6 +39,7 @@
 #include "clientlog.h"
 #include "conf.h"
 #include "memory.h"
+#include "ntp.h"
 #include "reports.h"
 #include "util.h"
 #include "logging.h"
@@ -57,6 +58,8 @@ typedef struct {
   int8_t cmd_rate;
   int8_t ntp_timeout_rate;
   uint8_t flags;
+  NTP_int64 ntp_rx_ts;
+  NTP_int64 ntp_tx_ts;
 } Record;
 
 /* Hash table of records, there is a fixed number of records per slot */
@@ -83,6 +86,10 @@ static unsigned int max_slots;
 #define TS_FRAC 4
 #define INVALID_TS 0
 
+/* Static offset included in conversion to the fixed-point timestamps to
+   randomise their alignment */
+static uint32_t ts_offset;
+
 /* Request rates are saved in the record as 8-bit scaled log2 values */
 #define RATE_SCALE 4
 #define MIN_RATE (-14 * RATE_SCALE)
@@ -92,7 +99,7 @@ static unsigned int max_slots;
    number of tokens spent on response are determined from configured
    minimum inverval between responses (in log2) and burst length. */
 
-#define MIN_LIMIT_INTERVAL (-TS_FRAC)
+#define MIN_LIMIT_INTERVAL (-15 - TS_FRAC)
 #define MAX_LIMIT_INTERVAL 12
 #define MIN_LIMIT_BURST 1
 #define MAX_LIMIT_BURST 255
@@ -102,7 +109,8 @@ static uint16_t max_cmd_tokens;
 static uint16_t ntp_tokens_per_packet;
 static uint16_t cmd_tokens_per_packet;
 
-/* Reduction of token rates to avoid overflow of 16-bit counters */
+/* Reduction of token rates to avoid overflow of 16-bit counters.  Negative
+   shift is used for coarse limiting with intervals shorter than -TS_FRAC. */
 static int ntp_token_shift;
 static int cmd_token_shift;
 
@@ -130,6 +138,8 @@ static uint32_t total_ntp_drops;
 static uint32_t total_cmd_drops;
 static uint32_t total_record_drops;
 
+#define NSEC_PER_SEC 1000000000U
+
 /* ================================================== */
 
 static int expand_hashtable(void);
@@ -155,7 +165,7 @@ get_record(IPAddr *ip)
   time_t last_hit, oldest_hit = 0;
   Record *record, *oldest_record;
 
-  if (ip->family != IPADDR_INET4 && ip->family != IPADDR_INET6)
+  if (!active || (ip->family != IPADDR_INET4 && ip->family != IPADDR_INET6))
     return NULL;
 
   while (1) {
@@ -206,6 +216,8 @@ get_record(IPAddr *ip)
   record->ntp_rate = record->cmd_rate = INVALID_RATE;
   record->ntp_timeout_rate = INVALID_RATE;
   record->flags = 0;
+  UTI_ZeroNtp64(&record->ntp_rx_ts);
+  UTI_ZeroNtp64(&record->ntp_tx_ts);
 
   return record;
 }
@@ -266,10 +278,17 @@ set_bucket_params(int interval, int burst, uint16_t *max_tokens,
   interval = CLAMP(MIN_LIMIT_INTERVAL, interval, MAX_LIMIT_INTERVAL);
   burst = CLAMP(MIN_LIMIT_BURST, burst, MAX_LIMIT_BURST);
 
-  /* Find smallest shift with which the maximum number fits in 16 bits */
-  for (*token_shift = 0; *token_shift < interval + TS_FRAC; (*token_shift)++) {
-    if (burst << (TS_FRAC + interval - *token_shift) < 1U << 16)
-      break;
+  if (interval >= -TS_FRAC) {
+    /* Find the smallest shift with which the maximum number fits in 16 bits */
+    for (*token_shift = 0; *token_shift < interval + TS_FRAC; (*token_shift)++) {
+      if (burst << (TS_FRAC + interval - *token_shift) < 1U << 16)
+        break;
+    }
+  } else {
+    /* Coarse rate limiting */
+    *token_shift = interval + TS_FRAC;
+    *tokens_per_packet = 1;
+    burst = MAX(1U << -*token_shift, burst);
   }
 
   *tokens_per_packet = 1U << (TS_FRAC + interval - *token_shift);
@@ -320,6 +339,9 @@ CLG_Initialise(void)
   records = NULL;
 
   expand_hashtable();
+
+  UTI_GetRandomBytes(&ts_offset, sizeof (ts_offset));
+  ts_offset %= NSEC_PER_SEC / (1U << TS_FRAC);
 }
 
 /* ================================================== */
@@ -336,23 +358,30 @@ CLG_Finalise(void)
 /* ================================================== */
 
 static uint32_t
-get_ts_from_timeval(struct timeval *tv)
+get_ts_from_timespec(struct timespec *ts)
 {
-  uint32_t sec = tv->tv_sec, usec = tv->tv_usec;
+  uint32_t sec = ts->tv_sec, nsec = ts->tv_nsec;
 
-  return sec << TS_FRAC | (4295U * usec - (usec >> 5)) >> (32 - TS_FRAC);
+  nsec += ts_offset;
+  if (nsec >= NSEC_PER_SEC) {
+    nsec -= NSEC_PER_SEC;
+    sec++;
+  }
+
+  /* This is fast and accurate enough */
+  return sec << TS_FRAC | (140740U * (nsec >> 15)) >> (32 - TS_FRAC);
 }
 
 /* ================================================== */
 
 static void
-update_record(struct timeval *now, uint32_t *last_hit, uint32_t *hits,
+update_record(struct timespec *now, uint32_t *last_hit, uint32_t *hits,
               uint16_t *tokens, uint32_t max_tokens, int token_shift, int8_t *rate)
 {
   uint32_t interval, now_ts, prev_hit, new_tokens;
   int interval2;
 
-  now_ts = get_ts_from_timeval(now);
+  now_ts = get_ts_from_timespec(now);
 
   prev_hit = *last_hit;
   *last_hit = now_ts;
@@ -363,7 +392,12 @@ update_record(struct timeval *now, uint32_t *last_hit, uint32_t *hits,
   if (prev_hit == INVALID_TS || (int32_t)interval < 0)
     return;
 
-  new_tokens = (now_ts >> token_shift) - (prev_hit >> token_shift);
+  if (token_shift >= 0)
+    new_tokens = (now_ts >> token_shift) - (prev_hit >> token_shift);
+  else if (now_ts - prev_hit > max_tokens)
+    new_tokens = max_tokens;
+  else
+    new_tokens = (now_ts - prev_hit) << -token_shift;
   *tokens = MIN(*tokens + new_tokens, max_tokens);
 
   /* Convert the interval to scaled and rounded log2 */
@@ -405,15 +439,26 @@ get_index(Record *record)
 /* ================================================== */
 
 int
-CLG_LogNTPAccess(IPAddr *client, struct timeval *now)
+CLG_GetClientIndex(IPAddr *client)
+{
+  Record *record;
+
+  record = get_record(client);
+  if (record == NULL)
+    return -1;
+
+  return get_index(record);
+}
+
+/* ================================================== */
+
+int
+CLG_LogNTPAccess(IPAddr *client, struct timespec *now)
 {
   Record *record;
 
   total_ntp_hits++;
 
-  if (!active)
-    return -1;
-
   record = get_record(client);
   if (record == NULL)
     return -1;
@@ -435,15 +480,12 @@ CLG_LogNTPAccess(IPAddr *client, struct timeval *now)
 /* ================================================== */
 
 int
-CLG_LogCommandAccess(IPAddr *client, struct timeval *now)
+CLG_LogCommandAccess(IPAddr *client, struct timespec *now)
 {
   Record *record;
 
   total_cmd_hits++;
 
-  if (!active)
-    return -1;
-
   record = get_record(client);
   if (record == NULL)
     return -1;
@@ -552,7 +594,19 @@ CLG_LimitCommandResponseRate(int index)
 
 /* ================================================== */
 
-extern int
+void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts)
+{
+  Record *record;
+
+  record = ARR_GetElement(records, index);
+
+  *rx_ts = &record->ntp_rx_ts;
+  *tx_ts = &record->ntp_tx_ts;
+}
+
+/* ================================================== */
+
+int
 CLG_GetNumberOfIndices(void)
 {
   if (!active)
@@ -586,7 +640,7 @@ static uint32_t get_last_ago(uint32_t x, uint32_t y)
 /* ================================================== */
 
 int
-CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timeval *now)
+CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timespec *now)
 {
   Record *record;
   uint32_t now_ts;
@@ -599,7 +653,7 @@ CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *repo
   if (record->ip_addr.family == IPADDR_UNSPEC)
     return 0;
 
-  now_ts = get_ts_from_timeval(now);
+  now_ts = get_ts_from_timespec(now);
 
   report->ip_addr = record->ip_addr;
   report->ntp_hits = record->ntp_hits;

clientlog.h

@@ -33,15 +33,17 @@
 
 extern void CLG_Initialise(void);
 extern void CLG_Finalise(void);
-extern int CLG_LogNTPAccess(IPAddr *client, struct timeval *now);
-extern int CLG_LogCommandAccess(IPAddr *client, struct timeval *now);
+extern int CLG_GetClientIndex(IPAddr *client);
+extern int CLG_LogNTPAccess(IPAddr *client, struct timespec *now);
+extern int CLG_LogCommandAccess(IPAddr *client, struct timespec *now);
 extern int CLG_LimitNTPResponseRate(int index);
 extern int CLG_LimitCommandResponseRate(int index);
+extern void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts);
 
 /* And some reporting functions, for use by chronyc. */
 
 extern int CLG_GetNumberOfIndices(void);
-extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timeval *now);
+extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timespec *now);
 extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
 
 #endif /* GOT_CLIENTLOG_H */

cmdmon.c

@@ -132,6 +132,10 @@ static const char permissions[] = {
   PERMIT_AUTH, /* REFRESH */
   PERMIT_AUTH, /* SERVER_STATS */
   PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX2 */
+  PERMIT_AUTH, /* LOCAL2 */
+  PERMIT_AUTH, /* NTP_DATA */
+  PERMIT_AUTH, /* ADD_SERVER2 */
+  PERMIT_AUTH, /* ADD_PEER2 */
 };
 
 /* ================================================== */
@@ -142,7 +146,7 @@ static ADF_AuthTable access_auth_table;
 
 /* ================================================== */
 /* Forward prototypes */
-static void read_from_cmd_socket(void *anything);
+static void read_from_cmd_socket(int sock_fd, int event, void *anything);
 
 /* ================================================== */
 
@@ -241,50 +245,58 @@ prepare_socket(int family, int port_number)
   }
 
   /* Register handler for read events on the socket */
-  SCH_AddInputFileHandler(sock_fd, read_from_cmd_socket, (void *)(long)sock_fd);
+  SCH_AddFileHandler(sock_fd, SCH_FILE_INPUT, read_from_cmd_socket, NULL);
 
   return sock_fd;
 }
 
 /* ================================================== */
 
+static void
+do_size_checks(void)
+{
+  int i, request_length, padding_length, reply_length;
+  CMD_Request request;
+  CMD_Reply reply;
+
+  assert(offsetof(CMD_Request, data) == 20);
+  assert(offsetof(CMD_Reply, data) == 28);
+
+  for (i = 0; i < N_REQUEST_TYPES; i++) {
+    request.version = PROTO_VERSION_NUMBER;
+    request.command = htons(i);
+    request_length = PKL_CommandLength(&request);
+    padding_length = PKL_CommandPaddingLength(&request);
+    if (padding_length > MAX_PADDING_LENGTH || padding_length > request_length ||
+        request_length > sizeof (CMD_Request) ||
+        (request_length && request_length < offsetof(CMD_Request, data)))
+      assert(0);
+  }
+
+  for (i = 1; i < N_REPLY_TYPES; i++) {
+    reply.reply = htons(i);
+    reply.status = STT_SUCCESS;
+    reply.data.manual_list.n_samples = htonl(MAX_MANUAL_LIST_SAMPLES);
+    reply_length = PKL_ReplyLength(&reply);
+    if ((reply_length && reply_length < offsetof(CMD_Reply, data)) ||
+        reply_length > sizeof (CMD_Reply))
+      assert(0);
+  }
+}
+
+/* ================================================== */
+
 void
 CAM_Initialise(int family)
 {
-  int i, port_number;
+  int port_number;
 
   assert(!initialised);
-  initialised = 1;
-
   assert(sizeof (permissions) / sizeof (permissions[0]) == N_REQUEST_TYPES);
+  do_size_checks();
 
-  for (i = 0; i < N_REQUEST_TYPES; i++) {
-    CMD_Request r;
-    int command_length, padding_length;
-
-    r.version = PROTO_VERSION_NUMBER;
-    r.command = htons(i);
-    command_length = PKL_CommandLength(&r);
-    padding_length = PKL_CommandPaddingLength(&r);
-    assert(padding_length <= MAX_PADDING_LENGTH && padding_length <= command_length);
-    assert((command_length >= offsetof(CMD_Request, data) &&
-            command_length <= sizeof (CMD_Request)) || command_length == 0);
-  }
-
-  for (i = 1; i < N_REPLY_TYPES; i++) {
-    CMD_Reply r;
-    int reply_length;
-
-    r.reply = htons(i);
-    r.status = STT_SUCCESS;
-    r.data.manual_list.n_samples = htonl(MAX_MANUAL_LIST_SAMPLES);
-    reply_length = PKL_ReplyLength(&r);
-    assert((reply_length >= offsetof(CMD_Reply, data) &&
-            reply_length <= sizeof (CMD_Reply)) || reply_length == 0);
-  }
-
+  initialised = 1;
   sock_fdu = -1;
-
   port_number = CNF_GetCommandPort();
 
   if (port_number && (family == IPADDR_UNSPEC || family == IPADDR_INET4))
@@ -316,19 +328,19 @@ void
 CAM_Finalise(void)
 {
   if (sock_fdu >= 0) {
-    SCH_RemoveInputFileHandler(sock_fdu);
+    SCH_RemoveFileHandler(sock_fdu);
     close(sock_fdu);
     unlink(CNF_GetBindCommandPath());
   }
   sock_fdu = -1;
   if (sock_fd4 >= 0) {
-    SCH_RemoveInputFileHandler(sock_fd4);
+    SCH_RemoveFileHandler(sock_fd4);
     close(sock_fd4);
   }
   sock_fd4 = -1;
 #ifdef FEAT_IPV6
   if (sock_fd6 >= 0) {
-    SCH_RemoveInputFileHandler(sock_fd6);
+    SCH_RemoveFileHandler(sock_fd6);
     close(sock_fd6);
   }
   sock_fd6 = -1;
@@ -555,10 +567,10 @@ handle_modify_makestep(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_settime(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  struct timeval ts;
+  struct timespec ts;
   long offset_cs;
   double dfreq_ppm, new_afreq_ppm;
-  UTI_TimevalNetworkToHost(&rx_message->data.settime.ts, &ts);
+  UTI_TimespecNetworkToHost(&rx_message->data.settime.ts, &ts);
   if (!MNL_IsEnabled()) {
     tx_message->status = htons(STT_NOTENABLED);
   } else if (MNL_AcceptTimestamp(&ts, &offset_cs, &dfreq_ppm, &new_afreq_ppm)) {
@@ -576,11 +588,10 @@ handle_settime(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_local(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  int on_off, stratum;
-  on_off = ntohl(rx_message->data.local.on_off);
-  if (on_off) {
-    stratum = ntohl(rx_message->data.local.stratum);
-    REF_EnableLocal(stratum);
+  if (ntohl(rx_message->data.local.on_off)) {
+    REF_EnableLocal(ntohl(rx_message->data.local.stratum),
+                    UTI_FloatNetworkToHost(rx_message->data.local.distance),
+                    ntohl(rx_message->data.local.orphan));
   } else {
     REF_DisableLocal();
   }
@@ -626,7 +637,7 @@ static void
 handle_source_data(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
   RPT_SourceReport report;
-  struct timeval now_corr;
+  struct timespec now_corr;
 
   /* Get data */
   SCH_GetLastEventTime(&now_corr, NULL, NULL);
@@ -769,26 +780,29 @@ handle_add_source(NTP_Source_Type type, CMD_Request *rx_message, CMD_Reply *tx_m
   params.minpoll = ntohl(rx_message->data.ntp_source.minpoll);
   params.maxpoll = ntohl(rx_message->data.ntp_source.maxpoll);
   params.presend_minpoll = ntohl(rx_message->data.ntp_source.presend_minpoll);
+  params.min_stratum = ntohl(rx_message->data.ntp_source.min_stratum);
+  params.poll_target = ntohl(rx_message->data.ntp_source.poll_target);
+  params.version = ntohl(rx_message->data.ntp_source.version);
+  params.max_sources = ntohl(rx_message->data.ntp_source.max_sources);
+  params.min_samples = ntohl(rx_message->data.ntp_source.min_samples);
+  params.max_samples = ntohl(rx_message->data.ntp_source.max_samples);
   params.authkey = ntohl(rx_message->data.ntp_source.authkey);
+  params.max_delay = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay);
+  params.max_delay_ratio =
+    UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay_ratio);
+  params.max_delay_dev_ratio =
+    UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay_dev_ratio);
+  params.offset = UTI_FloatNetworkToHost(rx_message->data.ntp_source.offset);
+
   params.online  = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_ONLINE ? 1 : 0;
   params.auto_offline = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_AUTOOFFLINE ? 1 : 0;
   params.iburst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_IBURST ? 1 : 0;
+  params.interleaved = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_INTERLEAVED ? 1 : 0;
   params.sel_options =
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_PREFER ? SRC_SELECT_PREFER : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NOSELECT ? SRC_SELECT_NOSELECT : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
-  params.max_delay = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay);
-  params.max_delay_ratio = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay_ratio);
-
- /* not transmitted in cmdmon protocol yet */
-  params.min_stratum = SRC_DEFAULT_MINSTRATUM;       
-  params.poll_target = SRC_DEFAULT_POLLTARGET;
-  params.max_delay_dev_ratio = SRC_DEFAULT_MAXDELAYDEVRATIO;
-  params.version = NTP_VERSION;
-  params.max_sources = SRC_DEFAULT_MAXSOURCES;
-  params.min_samples = SRC_DEFAULT_MINSAMPLES;
-  params.max_samples = SRC_DEFAULT_MAXSAMPLES;
 
   status = NSR_AddSource(&rem_addr, type, &params);
   switch (status) {
@@ -890,7 +904,7 @@ handle_tracking(CMD_Request *rx_message, CMD_Reply *tx_message)
   UTI_IPHostToNetwork(&rpt.ip_addr, &tx_message->data.tracking.ip_addr);
   tx_message->data.tracking.stratum = htons(rpt.stratum);
   tx_message->data.tracking.leap_status = htons(rpt.leap_status);
-  UTI_TimevalHostToNetwork(&rpt.ref_time, &tx_message->data.tracking.ref_time);
+  UTI_TimespecHostToNetwork(&rpt.ref_time, &tx_message->data.tracking.ref_time);
   tx_message->data.tracking.current_correction = UTI_FloatHostToNetwork(rpt.current_correction);
   tx_message->data.tracking.last_offset = UTI_FloatHostToNetwork(rpt.last_offset);
   tx_message->data.tracking.rms_offset = UTI_FloatHostToNetwork(rpt.rms_offset);
@@ -908,7 +922,7 @@ static void
 handle_smoothing(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
   RPT_SmoothingReport report;
-  struct timeval now;
+  struct timespec now;
 
   SCH_GetLastEventTime(&now, NULL, NULL);
 
@@ -932,7 +946,7 @@ handle_smoothing(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_smoothtime(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  struct timeval now;
+  struct timespec now;
   int option;
 
   if (!SMT_IsEnabled()) {
@@ -963,7 +977,7 @@ handle_sourcestats(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
   int status;
   RPT_SourcestatsReport report;
-  struct timeval now_corr;
+  struct timespec now_corr;
 
   SCH_GetLastEventTime(&now_corr, NULL, NULL);
   status = SRC_ReportSourcestats(ntohl(rx_message->data.sourcestats.index),
@@ -996,7 +1010,7 @@ handle_rtcreport(CMD_Request *rx_message, CMD_Reply *tx_message)
   status = RTC_GetReport(&report);
   if (status) {
     tx_message->reply  = htons(RPY_RTC);
-    UTI_TimevalHostToNetwork(&report.ref_time, &tx_message->data.rtc.ref_time);
+    UTI_TimespecHostToNetwork(&report.ref_time, &tx_message->data.rtc.ref_time);
     tx_message->data.rtc.n_samples = htons(report.n_samples);
     tx_message->data.rtc.n_runs = htons(report.n_runs);
     tx_message->data.rtc.span_seconds = htonl(report.span_seconds);
@@ -1033,7 +1047,7 @@ handle_client_accesses_by_index(CMD_Request *rx_message, CMD_Reply *tx_message)
   RPY_ClientAccesses_Client *client;
   int n_indices;
   uint32_t i, j, req_first_index, req_n_clients;
-  struct timeval now;
+  struct timespec now;
 
   SCH_GetLastEventTime(&now, NULL, NULL);
 
@@ -1092,7 +1106,7 @@ handle_manual_list(CMD_Request *rx_message, CMD_Reply *tx_message)
   tx_message->data.manual_list.n_samples = htonl(n_samples);
   for (i=0; i<n_samples; i++) {
     sample = &tx_message->data.manual_list.samples[i];
-    UTI_TimevalHostToNetwork(&report[i].when, &sample->when);
+    UTI_TimespecHostToNetwork(&report[i].when, &sample->when);
     sample->slewed_offset = UTI_FloatHostToNetwork(report[i].slewed_offset);
     sample->orig_offset = UTI_FloatHostToNetwork(report[i].orig_offset);
     sample->residual = UTI_FloatHostToNetwork(report[i].residual);
@@ -1177,26 +1191,69 @@ handle_server_stats(CMD_Request *rx_message, CMD_Reply *tx_message)
   tx_message->data.server_stats.log_drops = htonl(report.log_drops);
 }
 
+/* ================================================== */
+
+static void
+handle_ntp_data(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  RPT_NTPReport report;
+
+  UTI_IPNetworkToHost(&rx_message->data.ntp_data.ip_addr, &report.remote_addr);
+
+  if (!NSR_GetNTPReport(&report)) {
+    tx_message->status = htons(STT_NOSUCHSOURCE);
+    return;
+  }
+
+  tx_message->reply = htons(RPY_NTP_DATA);
+  UTI_IPHostToNetwork(&report.remote_addr, &tx_message->data.ntp_data.remote_addr);
+  UTI_IPHostToNetwork(&report.local_addr, &tx_message->data.ntp_data.local_addr);
+  tx_message->data.ntp_data.remote_port = htons(report.remote_port);
+  tx_message->data.ntp_data.leap = report.leap;
+  tx_message->data.ntp_data.version = report.version;
+  tx_message->data.ntp_data.mode = report.mode;
+  tx_message->data.ntp_data.stratum = report.stratum;
+  tx_message->data.ntp_data.poll = report.poll;
+  tx_message->data.ntp_data.precision = report.precision;
+  tx_message->data.ntp_data.root_delay = UTI_FloatHostToNetwork(report.root_delay);
+  tx_message->data.ntp_data.root_dispersion = UTI_FloatHostToNetwork(report.root_dispersion);
+  tx_message->data.ntp_data.ref_id = htonl(report.ref_id);
+  UTI_TimespecHostToNetwork(&report.ref_time, &tx_message->data.ntp_data.ref_time);
+  tx_message->data.ntp_data.offset = UTI_FloatHostToNetwork(report.offset);
+  tx_message->data.ntp_data.peer_delay = UTI_FloatHostToNetwork(report.peer_delay);
+  tx_message->data.ntp_data.peer_dispersion = UTI_FloatHostToNetwork(report.peer_dispersion);
+  tx_message->data.ntp_data.response_time = UTI_FloatHostToNetwork(report.response_time);
+  tx_message->data.ntp_data.jitter_asymmetry = UTI_FloatHostToNetwork(report.jitter_asymmetry);
+  tx_message->data.ntp_data.flags = htons((report.tests & RPY_NTP_FLAGS_TESTS) |
+                                          (report.interleaved ? RPY_NTP_FLAG_INTERLEAVED : 0) |
+                                          (report.authenticated ? RPY_NTP_FLAG_AUTHENTICATED : 0));
+  tx_message->data.ntp_data.tx_tss_char = report.tx_tss_char;
+  tx_message->data.ntp_data.rx_tss_char = report.rx_tss_char;
+  tx_message->data.ntp_data.total_tx_count = htonl(report.total_tx_count);
+  tx_message->data.ntp_data.total_rx_count = htonl(report.total_rx_count);
+  tx_message->data.ntp_data.total_valid_count = htonl(report.total_valid_count);
+  memset(tx_message->data.ntp_data.reserved, 0xff, sizeof (tx_message->data.ntp_data.reserved));
+}
+
 /* ================================================== */
 /* Read a packet and process it */
 
 static void
-read_from_cmd_socket(void *anything)
+read_from_cmd_socket(int sock_fd, int event, void *anything)
 {
   CMD_Request rx_message;
   CMD_Reply tx_message;
   int status, read_length, expected_length, rx_message_length;
-  int localhost, allowed, sock_fd, log_index;
+  int localhost, allowed, log_index;
   union sockaddr_all where_from;
   socklen_t from_length;
   IPAddr remote_ip;
   unsigned short remote_port, rx_command;
-  struct timeval now, cooked_now;
+  struct timespec now, cooked_now;
 
   rx_message_length = sizeof(rx_message);
   from_length = sizeof(where_from);
 
-  sock_fd = (long)anything;
   status = recvfrom(sock_fd, (char *)&rx_message, rx_message_length, 0,
                     &where_from.sa, &from_length);
 
@@ -1409,7 +1466,7 @@ read_from_cmd_socket(void *anything)
           handle_settime(&rx_message, &tx_message);
           break;
         
-        case REQ_LOCAL:
+        case REQ_LOCAL2:
           handle_local(&rx_message, &tx_message);
           break;
 
@@ -1469,11 +1526,11 @@ read_from_cmd_socket(void *anything)
           handle_cmdaccheck(&rx_message, &tx_message);
           break;
 
-        case REQ_ADD_SERVER:
+        case REQ_ADD_SERVER2:
           handle_add_source(NTP_SERVER, &rx_message, &tx_message);
           break;
 
-        case REQ_ADD_PEER:
+        case REQ_ADD_PEER2:
           handle_add_source(NTP_PEER, &rx_message, &tx_message);
           break;
 
@@ -1565,6 +1622,10 @@ read_from_cmd_socket(void *anything)
           handle_server_stats(&rx_message, &tx_message);
           break;
 
+        case REQ_NTP_DATA:
+          handle_ntp_data(&rx_message, &tx_message);
+          break;
+
         default:
           DEBUG_LOG(LOGF_CmdMon, "Unhandled command %d", rx_command);
           tx_message.status = htons(STT_FAILED);

cmdparse.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2013-2014
+ * Copyright (C) Miroslav Lichvar  2013-2014, 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
@@ -39,252 +39,151 @@
 
 /* ================================================== */
 
-CPS_Status
+int
 CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 {
   char *hostname, *cmd;
-  int n, done;
-  CPS_Status result;
+  int n;
   
   src->port = SRC_DEFAULT_PORT;
   src->params.minpoll = SRC_DEFAULT_MINPOLL;
   src->params.maxpoll = SRC_DEFAULT_MAXPOLL;
+  src->params.online = 1;
+  src->params.auto_offline = 0;
   src->params.presend_minpoll = SRC_DEFAULT_PRESEND_MINPOLL;
+  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.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.online = 1;
-  src->params.auto_offline = 0;
-  src->params.iburst = 0;
-  src->params.min_stratum = SRC_DEFAULT_MINSTRATUM;
-  src->params.poll_target = SRC_DEFAULT_POLLTARGET;
-  src->params.version = NTP_VERSION;
-  src->params.max_sources = SRC_DEFAULT_MAXSOURCES;
-  src->params.min_samples = SRC_DEFAULT_MINSAMPLES;
-  src->params.max_samples = SRC_DEFAULT_MAXSAMPLES;
-  src->params.sel_options = 0;
+  src->params.offset = 0.0;
 
-  result = CPS_Success;
-  
   hostname = line;
   line = CPS_SplitWord(line);
 
-  if (!*hostname) {
-    result = CPS_BadHost;
-  } else {
-    src->name = hostname;
+  if (!*hostname)
+    return 0;
 
-    /* Parse subfields */
-    done = 0;
-    do {
-      cmd = line;
-      line = CPS_SplitWord(line);
+  src->name = hostname;
 
-      if (*cmd) {
-        if (!strcasecmp(cmd, "port")) {
-          if (sscanf(line, "%hu%n", &src->port, &n) != 1) {
-            result = CPS_BadPort;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "minpoll")) {
-          if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1) {
-            result = CPS_BadMinpoll;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "maxpoll")) {
-          if (sscanf(line, "%d%n", &src->params.maxpoll, &n) != 1) {
-            result = CPS_BadMaxpoll;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "presend")) {
-          if (sscanf(line, "%d%n", &src->params.presend_minpoll, &n) != 1) {
-            result = CPS_BadPresend;
-            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;
-            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;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "maxdelay")) {
-          if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1) {
-            result = CPS_BadMaxdelay;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "key")) {
-          if (sscanf(line, "%"SCNu32"%n", &src->params.authkey, &n) != 1 ||
-              src->params.authkey == INACTIVE_AUTHKEY) {
-            result = CPS_BadKey;
-            done = 1;
-          } else {
-            line += n;
-          }
-        } else if (!strcasecmp(cmd, "offline")) {
-          src->params.online = 0;
+  /* Parse options */
+  for (; *line; line += n) {
+    cmd = line;
+    line = CPS_SplitWord(line);
+    n = 0;
 
-        } else if (!strcasecmp(cmd, "auto_offline")) {
-          src->params.auto_offline = 1;
-        
-        } else if (!strcasecmp(cmd, "iburst")) {
-          src->params.iburst = 1;
-
-        } else if (!strcasecmp(cmd, "minstratum")) {
-          if (sscanf(line, "%d%n", &src->params.min_stratum, &n) != 1) {
-            result = CPS_BadMinstratum;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } else if (!strcasecmp(cmd, "polltarget")) {
-          if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1) {
-            result = CPS_BadPolltarget;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } 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, "trust")) {
-          src->params.sel_options |= SRC_SELECT_TRUST;
-
-        } else if (!strcasecmp(cmd, "require")) {
-          src->params.sel_options |= SRC_SELECT_REQUIRE;
-
-        } else if (!strcasecmp(cmd, "version")) {
-          if (sscanf(line, "%d%n", &src->params.version, &n) != 1) {
-            result = CPS_BadVersion;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } else if (!strcasecmp(cmd, "maxsources")) {
-          if (sscanf(line, "%d%n", &src->params.max_sources, &n) != 1) {
-            result = CPS_BadMaxsources;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } else if (!strcasecmp(cmd, "minsamples")) {
-          if (sscanf(line, "%d%n", &src->params.min_samples, &n) != 1) {
-            result = CPS_BadMinsamples;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } else if (!strcasecmp(cmd, "maxsamples")) {
-          if (sscanf(line, "%d%n", &src->params.max_samples, &n) != 1) {
-            result = CPS_BadMaxsamples;
-            done = 1;
-          } else {
-            line += n;
-          }
-
-        } else {
-          result = CPS_BadOption;
-          done = 1;
-        }
-      } else {
-        done = 1;
-      }
-    } while (!done);
+    if (!strcasecmp(cmd, "auto_offline")) {
+      src->params.auto_offline = 1;
+    } else if (!strcasecmp(cmd, "iburst")) {
+      src->params.iburst = 1;
+    } else if (!strcasecmp(cmd, "offline")) {
+      src->params.online = 0;
+    } 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, "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, "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)
+        return 0;
+    } else if (!strcasecmp(cmd, "offset")) {
+      if (sscanf(line, "%lf%n", &src->params.offset, &n) != 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 result;
+  return 1;
 }
 
 /* ================================================== */
 
-void
-CPS_StatusToString(CPS_Status status, char *dest, int len)
+int
+CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance)
 {
-  const char *s = NULL;
+  int n;
+  char *cmd;
 
-  if (len > 0)
-    dest[0] = '\0';
+  *stratum = 10;
+  *distance = 1.0;
+  *orphan = 0;
 
-  switch (status) {
-    case CPS_Success:
-      return;
-    case CPS_BadOption:
-      s = "server/peer/pool option";
-      break;
-    case CPS_BadHost:
-      s = "address";
-      break;
-    case CPS_BadPort:
-      s = "port";
-      break;
-    case CPS_BadMinpoll:
-      s = "minpoll";
-      break;
-    case CPS_BadMaxpoll:
-      s = "maxpoll";
-      break;
-    case CPS_BadPresend:
-      s = "presend";
-      break;
-    case CPS_BadMaxdelaydevratio:
-      s = "maxdelaydevratio";
-      break;
-    case CPS_BadMaxdelayratio:
-      s = "maxdelayratio";
-      break;
-    case CPS_BadMaxdelay:
-      s = "maxdelay";
-      break;
-    case CPS_BadKey:
-      s = "key";
-      break;
-    case CPS_BadMinstratum:
-      s = "minstratum";
-      break;
-    case CPS_BadPolltarget:
-      s = "polltarget";
-      break;
-    case CPS_BadVersion:
-      s = "version";
-      break;
-    case CPS_BadMaxsources:
-      s = "maxsources";
-      break;
-    case CPS_BadMinsamples:
-      s = "minsamples";
-      break;
-    case CPS_BadMaxsamples:
-      s = "maxsamples";
-      break;
+  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;
   }
 
-  snprintf(dest, len, "Invalid %s", s);
+  return 1;
 }
 
 /* ================================================== */

cmdparse.h

@@ -30,26 +30,6 @@
 #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_BadVersion,
-  CPS_BadMaxsources,
-  CPS_BadMinsamples,
-  CPS_BadMaxsamples,
-} CPS_Status;
-
 typedef struct {
   char *name;
   unsigned short port;
@@ -57,10 +37,10 @@ typedef struct {
 } CPS_NTP_Source;
 
 /* Parse a command to add an NTP server or peer */
-extern CPS_Status CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
+extern int CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
   
-/* Get a string describing error status */
-extern void CPS_StatusToString(CPS_Status status, char *dest, int len);
+/* 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);

conf.c

@@ -57,6 +57,7 @@ static void parse_bindcmdaddress(char *);
 static void parse_broadcast(char *);
 static void parse_clientloglimit(char *);
 static void parse_fallbackdrift(char *);
+static void parse_hwtimestamp(char *);
 static void parse_include(char *);
 static void parse_initstepslew(char *);
 static void parse_leapsecmode(char *);
@@ -85,9 +86,11 @@ static char *rtc_file = NULL;
 static double max_update_skew = 1000.0;
 static double correction_time_ratio = 3.0;
 static double max_clock_error = 1.0; /* in ppm */
+static double max_drift = 500000.0; /* in ppm */
 static double max_slew_rate = 1e6 / 12.0; /* in ppm */
 
 static double max_distance = 3.0;
+static double max_jitter = 1.0;
 static double reselect_distance = 1e-4;
 static double stratum_weight = 1e-3;
 static double combine_limit = 3.0;
@@ -107,6 +110,8 @@ static char *dumpdir;
 
 static int enable_local=0;
 static int local_stratum;
+static int local_orphan;
+static double local_distance;
 
 /* Threshold (in seconds) - if absolute value of initial error is less
    than this, slew instead of stepping */
@@ -144,7 +149,7 @@ static double max_offset;
 
 /* Maximum and minimum number of samples per source */
 static int max_samples = 0; /* no limit */
-static int min_samples = 0;
+static int min_samples = 6;
 
 /* Threshold for a time adjustment to be logged to syslog */
 static double log_change_threshold = 1.0;
@@ -178,6 +183,9 @@ static IPAddr bind_cmd_address4, bind_cmd_address6;
 /* Path to the Unix domain command socket. */
 static char *bind_cmd_path;
 
+/* Path to Samba (ntp_signd) socket. */
+static char *ntp_signd_socket = NULL;
+
 /* Filename to use for storing pid of running chronyd, to prevent multiple
  * chronyds being started. */
 static char *pidfile;
@@ -186,10 +194,10 @@ static char *pidfile;
 static int ntp_ratelimit_enabled = 0;
 static int ntp_ratelimit_interval = 3;
 static int ntp_ratelimit_burst = 8;
-static int ntp_ratelimit_leak = 3;
+static int ntp_ratelimit_leak = 2;
 static int cmd_ratelimit_enabled = 0;
-static int cmd_ratelimit_interval = 1;
-static int cmd_ratelimit_burst = 16;
+static int cmd_ratelimit_interval = -4;
+static int cmd_ratelimit_burst = 8;
 static int cmd_ratelimit_leak = 2;
 
 /* Smoothing constants */
@@ -215,6 +223,15 @@ static char *leapsec_tz = NULL;
 /* Name of the user to which will be dropped root privileges. */
 static char *user;
 
+typedef struct {
+  char *name;
+  double tx_comp;
+  double rx_comp;
+} HwTs_Interface;
+
+/* Array of HwTs_Interface */
+static ARR_Instance hwts_interfaces;
+
 typedef struct {
   NTP_Source_Type type;
   int pool;
@@ -316,6 +333,8 @@ CNF_Initialise(int r)
 {
   restarted = r;
 
+  hwts_interfaces = ARR_CreateInstance(sizeof (HwTs_Interface));
+
   init_sources = ARR_CreateInstance(sizeof (IPAddr));
   ntp_sources = ARR_CreateInstance(sizeof (NTP_Source));
   refclock_sources = ARR_CreateInstance(sizeof (RefclockParameters));
@@ -324,11 +343,11 @@ CNF_Initialise(int r)
   ntp_restrictions = ARR_CreateInstance(sizeof (AllowDeny));
   cmd_restrictions = ARR_CreateInstance(sizeof (AllowDeny));
 
-  dumpdir = Strdup(".");
-  logdir = Strdup(".");
+  dumpdir = Strdup("");
+  logdir = Strdup("");
   bind_cmd_path = Strdup(DEFAULT_COMMAND_SOCKET);
-  pidfile = Strdup("/var/run/chronyd.pid");
-  rtc_device = Strdup("/dev/rtc");
+  pidfile = Strdup(DEFAULT_PID_FILE);
+  rtc_device = Strdup(DEFAULT_RTC_DEVICE);
   hwclock_file = Strdup(DEFAULT_HWCLOCK_FILE);
   user = Strdup(DEFAULT_USER);
 }
@@ -340,6 +359,10 @@ CNF_Finalise(void)
 {
   unsigned int i;
 
+  for (i = 0; i < ARR_GetSize(hwts_interfaces); i++)
+    Free(((HwTs_Interface *)ARR_GetElement(hwts_interfaces, i))->name);
+  ARR_DestroyInstance(hwts_interfaces);
+
   for (i = 0; i < ARR_GetSize(ntp_sources); i++)
     Free(((NTP_Source *)ARR_GetElement(ntp_sources, i))->params.name);
 
@@ -358,6 +381,7 @@ CNF_Finalise(void)
   Free(leapsec_tz);
   Free(logdir);
   Free(bind_cmd_path);
+  Free(ntp_signd_socket);
   Free(pidfile);
   Free(rtc_device);
   Free(rtc_file);
@@ -455,6 +479,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_fallbackdrift(p);
   } else if (!strcasecmp(command, "hwclockfile")) {
     parse_string(p, &hwclock_file);
+  } else if (!strcasecmp(command, "hwtimestamp")) {
+    parse_hwtimestamp(p);
   } else if (!strcasecmp(command, "include")) {
     parse_include(p);
   } else if (!strcasecmp(command, "initstepslew")) {
@@ -489,6 +515,10 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_double(p, &max_clock_error);
   } else if (!strcasecmp(command, "maxdistance")) {
     parse_double(p, &max_distance);
+  } else if (!strcasecmp(command, "maxdrift")) {
+    parse_double(p, &max_drift);
+  } else if (!strcasecmp(command, "maxjitter")) {
+    parse_double(p, &max_jitter);
   } else if (!strcasecmp(command, "maxsamples")) {
     parse_int(p, &max_samples);
   } else if (!strcasecmp(command, "maxslewrate")) {
@@ -501,6 +531,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_int(p, &min_sources);
   } else if (!strcasecmp(command, "noclientlog")) {
     no_client_log = parse_null(p);
+  } else if (!strcasecmp(command, "ntpsigndsocket")) {
+    parse_string(p, &ntp_signd_socket);
   } else if (!strcasecmp(command, "peer")) {
     parse_source(p, NTP_PEER, 0);
   } else if (!strcasecmp(command, "pidfile")) {
@@ -599,17 +631,13 @@ parse_null(char *line)
 static void
 parse_source(char *line, NTP_Source_Type type, int pool)
 {
-  CPS_Status status;
   NTP_Source source;
-  char str[64];
 
   source.type = type;
   source.pool = pool;
-  status = CPS_ParseNTPSourceAdd(line, &source.params);
 
-  if (status != CPS_Success) {
-    CPS_StatusToString(status, str, sizeof (str));
-    other_parse_error(str);
+  if (!CPS_ParseNTPSourceAdd(line, &source.params)) {
+    command_parse_error();
     return;
   }
 
@@ -652,6 +680,7 @@ static void
 parse_refclock(char *line)
 {
   int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
+  int max_lock_age;
   uint32_t ref_id, lock_ref_id;
   double offset, delay, precision, max_dispersion;
   char *p, *cmd, *name, *param;
@@ -670,6 +699,7 @@ parse_refclock(char *line)
   precision = 0.0;
   max_dispersion = 0.0;
   ref_id = 0;
+  max_lock_age = 2;
   lock_ref_id = 0;
 
   if (!*line) {
@@ -691,9 +721,9 @@ parse_refclock(char *line)
   line = CPS_SplitWord(line);
   param = Strdup(p);
 
-  while (*line) {
-    cmd = line;
+  for (cmd = line; *cmd; line += n, cmd = line) {
     line = CPS_SplitWord(line);
+
     if (!strcasecmp(cmd, "refid")) {
       if (sscanf(line, "%4s%n", (char *)ref, &n) != 1)
         break;
@@ -720,6 +750,9 @@ parse_refclock(char *line)
     } else if (!strcasecmp(cmd, "minsamples")) {
       if (sscanf(line, "%d%n", &min_samples, &n) != 1)
         break;
+    } else if (!strcasecmp(cmd, "maxlockage")) {
+      if (sscanf(line, "%d%n", &max_lock_age, &n) != 1)
+        break;
     } else if (!strcasecmp(cmd, "maxsamples")) {
       if (sscanf(line, "%d%n", &max_samples, &n) != 1)
         break;
@@ -751,10 +784,9 @@ parse_refclock(char *line)
       other_parse_error("Invalid refclock option");
       return;
     }
-    line += n;
   }
 
-  if (*line) {
+  if (*cmd) {
     command_parse_error();
     return;
   }
@@ -774,6 +806,7 @@ parse_refclock(char *line)
   refclock->precision = precision;
   refclock->max_dispersion = max_dispersion;
   refclock->ref_id = ref_id;
+  refclock->max_lock_age = max_lock_age;
   refclock->lock_ref_id = lock_ref_id;
 }
 
@@ -814,13 +847,9 @@ parse_log(char *line)
 static void
 parse_local(char *line)
 {
-  int stratum;
-  if (sscanf(line, "stratum%d", &stratum) == 1) {
-    local_stratum = stratum;
-    enable_local = 1;
-  } else {
+  if (!CPS_ParseLocal(line, &local_stratum, &local_orphan, &local_distance))
     command_parse_error();
-  }
+  enable_local = 1;
 }
 
 /* ================================================== */
@@ -1219,6 +1248,46 @@ parse_tempcomp(char *line)
 
 /* ================================================== */
 
+static void
+parse_hwtimestamp(char *line)
+{
+  HwTs_Interface *iface;
+  char *p;
+  int n;
+
+  if (!*line) {
+    command_parse_error();
+    return;
+  }
+
+  p = line;
+  line = CPS_SplitWord(line);
+
+  iface = ARR_GetNewElement(hwts_interfaces);
+  iface->name = Strdup(p);
+  iface->tx_comp = 0.0;
+  iface->rx_comp = 0.0;
+
+  for (p = line; *p; line += n, p = line) {
+    line = CPS_SplitWord(line);
+
+    if (!strcasecmp(p, "rxcomp")) {
+      if (sscanf(line, "%lf%n", &iface->rx_comp, &n) != 1)
+        break;
+    } else if (!strcasecmp(p, "txcomp")) {
+      if (sscanf(line, "%lf%n", &iface->tx_comp, &n) != 1)
+        break;
+    } else {
+      break;
+    }
+  }
+
+  if (*p)
+    command_parse_error();
+}
+
+/* ================================================== */
+
 static void
 parse_include(char *line)
 {
@@ -1245,9 +1314,6 @@ CNF_CreateDirs(uid_t uid, gid_t gid)
 {
   char *dir;
 
-  UTI_CreateDirAndParents(logdir, 0755, uid, gid);
-  UTI_CreateDirAndParents(dumpdir, 0755, uid, gid);
-
   /* Create a directory for the Unix domain command socket */
   if (bind_cmd_path[0]) {
     dir = UTI_PathToDir(bind_cmd_path);
@@ -1263,6 +1329,11 @@ CNF_CreateDirs(uid_t uid, gid_t gid)
 
     Free(dir);
   }
+
+  if (logdir[0])
+    UTI_CreateDirAndParents(logdir, 0755, uid, gid);
+  if (dumpdir[0])
+    UTI_CreateDirAndParents(dumpdir, 0755, uid, gid);
 }
 
 /* ================================================== */
@@ -1486,6 +1557,14 @@ CNF_GetMaxUpdateSkew(void)
 
 /* ================================================== */
 
+double
+CNF_GetMaxDrift(void)
+{
+  return max_drift;
+}
+
+/* ================================================== */
+
 double
 CNF_GetMaxClockError(void)
 {
@@ -1518,6 +1597,14 @@ CNF_GetMaxDistance(void)
 
 /* ================================================== */
 
+double
+CNF_GetMaxJitter(void)
+{
+  return max_jitter;
+}
+
+/* ================================================== */
+
 double
 CNF_GetReselectDistance(void)
 {
@@ -1558,10 +1645,12 @@ CNF_GetCommandPort(void) {
 /* ================================================== */
 
 int
-CNF_AllowLocalReference(int *stratum)
+CNF_AllowLocalReference(int *stratum, int *orphan, double *distance)
 {
   if (enable_local) {
     *stratum = local_stratum;
+    *orphan = local_orphan;
+    *distance = local_distance;
     return 1;
   } else {
     return 0;
@@ -1730,6 +1819,14 @@ CNF_GetBindCommandAddress(int family, IPAddr *addr)
 
 /* ================================================== */
 
+char *
+CNF_GetNtpSigndSocket(void)
+{
+  return ntp_signd_socket;
+}
+
+/* ================================================== */
+
 char *
 CNF_GetPidFile(void)
 {
@@ -1867,3 +1964,21 @@ CNF_GetInitStepThreshold(void)
 {
   return init_slew_threshold;
 }
+
+/* ================================================== */
+
+int
+CNF_GetHwTsInterface(unsigned int index, char **name, double *tx_comp, double *rx_comp)
+{
+  HwTs_Interface *iface;
+
+  if (index >= ARR_GetSize(hwts_interfaces))
+    return 0;
+
+  iface = ARR_GetElement(hwts_interfaces, index);
+  *name = iface->name;
+  *tx_comp = iface->tx_comp;
+  *rx_comp = iface->rx_comp;
+
+  return 1;
+}

conf.h

@@ -76,6 +76,7 @@ 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);
@@ -83,15 +84,17 @@ 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);
+extern int CNF_AllowLocalReference(int *stratum, int *orphan, double *distance);
 
 extern void CNF_SetupAccessRestrictions(void);
 
@@ -116,4 +119,6 @@ extern char *CNF_GetHwclockFile(void);
 extern int CNF_GetInitSources(void);
 extern double CNF_GetInitStepThreshold(void);
 
+extern int CNF_GetHwTsInterface(unsigned int index, char **name, double *tx_comp, double *rx_comp);
+
 #endif /* GOT_CONF_H */

configure

@@ -24,6 +24,7 @@ test_code () {
   printf "%s" "Checking for $name : "
 
   (
+    echo "#include \"config.h\""
     for h in $headers; do
       echo "#include <$h>"
     done
@@ -79,9 +80,8 @@ 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
-  --readline-dir=DIR     Specify parent of readline include and lib directories
-  --readline-inc-dir=DIR Specify where readline include directory is
-  --readline-lib-dir=DIR Specify where readline lib directory is
+  --with-readline-includes=DIR Specify where readline include directory is
+  --with-readline-library=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-nss          Don't use NSS even if it is available
@@ -99,10 +99,15 @@ For better control, use the options below.
   --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/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
 
@@ -111,11 +116,10 @@ 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]
-  --chronysockdir=DIR    location for chrony sockets [LOCALSTATEDIR/run/chrony]
+  --chronyrundir=DIR     location for chrony sockets [LOCALSTATEDIR/run/chrony]
   --chronyvardir=DIR     location for chrony data [LOCALSTATEDIR/lib/chrony]
 
 Overriding system detection when cross-compiling:
@@ -214,9 +218,16 @@ 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=""
 default_user="root"
 default_hwclockfile=""
+default_pidfile="/var/run/chronyd.pid"
+default_rtcdevice="/dev/rtc"
 mail_program="/usr/lib/sendmail"
 
 for option
@@ -261,9 +272,6 @@ do
     --datarootdir=* )
       SETDATAROOTDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
-    --infodir=* )
-      SETINFODIR=`echo $option | sed -e 's/^.*=//;'`
-    ;;
     --mandir=* )
       SETMANDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -273,8 +281,8 @@ do
     --localstatedir=* )
       SETLOCALSTATEDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
-    --chronysockdir=* )
-      SETCHRONYSOCKDIR=`echo $option | sed -e 's/^.*=//;'`
+    --chronyrundir=* | --chronysockdir=* )
+      SETCHRONYRUNDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
     --chronyvardir=* )
       SETCHRONYVARDIR=`echo $option | sed -e 's/^.*=//;'`
@@ -321,6 +329,15 @@ 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/^.*=//;'`
     ;;
@@ -330,6 +347,12 @@ do
     --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/^.*=//;'`
     ;;
@@ -370,6 +393,7 @@ case $OPERATINGSYSTEM in
         [ $try_libcap != "0" ] && try_libcap=1
         try_rtc=1
         [ $try_seccomp != "0" ] && try_seccomp=1
+        try_timestamping=1
         try_setsched=1
         try_lockmem=1
         try_phc=1
@@ -377,6 +401,9 @@ case $OPERATINGSYSTEM in
         echo "Configuring for " $SYSTEM
     ;;
     FreeBSD)
+        # recvmmsg() seems to be broken on FreeBSD 11.0 and it's just
+        # a wrapper around recvmsg()
+        try_recvmmsg=0
         EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o"
         add_def FREEBSD
         if [ $feat_droproot = "1" ]; then
@@ -400,7 +427,7 @@ case $OPERATINGSYSTEM in
           add_def FEAT_PRIVDROP
           priv_ops="ADJUSTTIME SETTIME BINDSOCKET"
         fi
-        echo "Configuring for MacOS X (" $SYSTEM "MacOS X version" $VERSION ")"
+        echo "Configuring for macOS (" $SYSTEM "macOS version" $VERSION ")"
     ;;
     SunOS)
         EXTRA_OBJECTS="sys_generic.o sys_solaris.o sys_timex.o"
@@ -436,8 +463,13 @@ 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
@@ -563,6 +595,21 @@ then
   fi
 fi
 
+if [ $try_clock_gettime = "1" ]; then
+  if test_code 'clock_gettime()' 'time.h' '' '' \
+    'clock_gettime(CLOCK_REALTIME, NULL);'
+  then
+    add_def HAVE_CLOCK_GETTIME
+  else
+    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
+      'clock_gettime(CLOCK_REALTIME, NULL);'
+    then
+      add_def HAVE_CLOCK_GETTIME
+      EXTRA_LIBS="$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
@@ -583,6 +630,35 @@ if test_code 'arc4random_buf()' 'stdlib.h' '' '' 'arc4random_buf(NULL, 0);'; the
   add_def HAVE_ARC4RANDOM
 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"
+fi
+
 timepps_h=""
 if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
   if test_code '<sys/timepps.h>' 'sys/timepps.h' '' '' ''; then
@@ -653,19 +729,11 @@ then
 fi
 
 if [ $feat_refclock = "1" ] && [ $feat_phc = "1" ] && [ $try_phc = "1" ] && \
+  grep '#define HAVE_CLOCK_GETTIME' config.h > /dev/null && \
   test_code '<linux/ptp_clock.h>' 'sys/ioctl.h linux/ptp_clock.h' '' '' \
     'ioctl(1, PTP_CLOCK_GETCAPS, 0);'
 then
-  if test_code 'clock_gettime()' 'time.h' '' '' 'clock_gettime(0, NULL);'; then
-    add_def FEAT_PHC
-  else
-    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
-      'clock_gettime(0, NULL);'
-    then
-      EXTRA_LIBS="$EXTRA_LIBS -lrt"
-      add_def FEAT_PHC
-    fi
-  fi
+  add_def FEAT_PHC
 fi
 
 if [ $try_setsched = "1" ] && \
@@ -695,7 +763,6 @@ then
   add_def FORCE_DNSRETRY
 fi
 
-READLINE_COMPILE=""
 READLINE_LINK=""
 if [ $feat_readline = "1" ]; then
   if [ $try_editline = "1" ]; then
@@ -705,7 +772,7 @@ if [ $feat_readline = "1" ]; then
     then
       add_def FEAT_READLINE
       add_def USE_EDITLINE
-      READLINE_COMPILE="$readline_inc"
+      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
       READLINE_LINK="$readline_lib -ledit"
     fi
   fi
@@ -716,7 +783,7 @@ if [ $feat_readline = "1" ]; then
       'add_history(readline("prompt"));'
     then
       add_def FEAT_READLINE
-      READLINE_COMPILE="$readline_inc"
+      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
       READLINE_LINK="$readline_lib -lreadline"
     fi
   fi
@@ -728,7 +795,7 @@ if [ $feat_readline = "1" ]; then
       'add_history(readline("prompt"));'
     then
       add_def FEAT_READLINE
-      READLINE_COMPILE="$readline_inc"
+      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
       READLINE_LINK="$readline_lib $ncurses_lib -lreadline -lncurses"
     fi
   fi
@@ -737,7 +804,6 @@ if [ $feat_readline = "1" ]; then
 fi
 
 HASH_OBJ="hash_intmd5.o"
-HASH_COMPILE=""
 HASH_LINK=""
 
 if [ $feat_sechash = "1" ] && [ $try_nss = "1" ]; then
@@ -748,9 +814,9 @@ if [ $feat_sechash = "1" ] && [ $try_nss = "1" ]; then
     'NSSLOWHASH_Begin(NSSLOWHASH_NewContext(NSSLOW_Init(), HASH_AlgSHA512));'
   then
     HASH_OBJ="hash_nss.o"
-    HASH_COMPILE="$test_cflags"
     HASH_LINK="$test_link"
     LIBS="$LIBS $HASH_LINK"
+    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
     add_def FEAT_SECHASH
   fi
 fi
@@ -760,9 +826,9 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]
     'hash_memory_multi(find_hash("md5"), NULL, NULL, NULL, 0, NULL, 0);'
   then
     HASH_OBJ="hash_tomcrypt.o"
-    HASH_COMPILE="-I/usr/include/tomcrypt"
     HASH_LINK="-ltomcrypt"
     LIBS="$LIBS $HASH_LINK"
+    MYCPPFLAGS="$MYCPPFLAGS -I/usr/include/tomcrypt"
     add_def FEAT_SECHASH
   fi
 fi
@@ -797,11 +863,6 @@ 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
@@ -817,9 +878,9 @@ if [ "x$SETLOCALSTATEDIR" != "x" ]; then
   LOCALSTATEDIR=$SETLOCALSTATEDIR
 fi
 
-CHRONYSOCKDIR=${LOCALSTATEDIR}/run/chrony
-if [ "x$SETCHRONYSOCKDIR" != "x" ]; then
-  CHRONYSOCKDIR=$SETCHRONYSOCKDIR
+CHRONYRUNDIR=${LOCALSTATEDIR}/run/chrony
+if [ "x$SETCHRONYRUNDIR" != "x" ]; then
+  CHRONYRUNDIR=$SETCHRONYRUNDIR
 fi
 
 CHRONYVARDIR=${LOCALSTATEDIR}/lib/chrony
@@ -829,13 +890,15 @@ fi
 
 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 "\"$default_user\""
-add_def DEFAULT_COMMAND_SOCKET "\"$CHRONYSOCKDIR/chronyd.sock\""
+add_def DEFAULT_COMMAND_SOCKET "\"$CHRONYRUNDIR/chronyd.sock\""
 add_def MAIL_PROGRAM "\"$mail_program\""
 
 common_features="`get_features IPV6 DEBUG`"
 chronyc_features="`get_features READLINE`"
-chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SECHASH ASYNCDNS`"
+chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SECHASH 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"
@@ -848,7 +911,7 @@ fi
 
 add_def CHRONY_VERSION "\"${CHRONY_VERSION}\""
 
-for f in Makefile test/unit/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}%;\
@@ -859,19 +922,18 @@ 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@%${LOCALSTATEDIR}%;\
-          s%@CHRONYSOCKDIR@%${CHRONYSOCKDIR}%;\
+          s%@CHRONYRUNDIR@%${CHRONYRUNDIR}%;\
           s%@CHRONYVARDIR@%${CHRONYVARDIR}%;\
           s%@DEFAULT_HWCLOCK_FILE@%${default_hwclockfile}%;\
+          s%@DEFAULT_PID_FILE@%${default_pidfile}%;\
+          s%@DEFAULT_RTC_DEVICE@%${default_rtcdevice}%;\
           s%@DEFAULT_USER@%${default_user}%;\
           s%@CHRONY_VERSION@%${CHRONY_VERSION}%;" \
           < ${f}.in > $f

contrib/bryan_christianson_1/README.txt

@@ -1,16 +1,16 @@
-Notes for installing chrony on MacOS X
+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)
+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 X command line then
+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
@@ -72,7 +72,7 @@ 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 X logrotation does not work with
+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

doc/Makefile.in

@@ -0,0 +1,76 @@
+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

doc/chronyd.adoc

@@ -0,0 +1,172 @@
+// 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.
+
+= 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 sent to the terminal instead of to syslog. When
+*chronyd* was compiled with debugging support, this option can be used twice to
+print also debugging messages.
+
+*-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 *-q*, but it will only print the offset without any
+corrections of the clock.
+
+*-r*::
+This option will try to reload and then delete files containing sample
+histories for each of the servers and reference clocks being used. These
+histories are created by using the <<chronyc.adoc#dump,*dump*>> command in
+*chronyc*, or by setting the <<chrony.conf.adoc#dumponexit,*dumponexit*>>
+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
+and Solaris).
+
+*-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 SYSSIG
+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.
+
+*-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.

doc/faq.adoc

@@ -1,77 +1,71 @@
+// 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:
 
-Frequently Asked Questions
-==========================
+== `chrony` compared to other programs
 
-== +chrony+ compared to other programs
+=== How does `chrony` compare to `ntpd`?
 
-=== 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
+`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.
 
-For a more detailed comparison of features and performance, see the
-http://chrony.tuxfamily.org/comparison.html[comparison page] on the +chrony+
-website and the
-http://chrony.tuxfamily.org/manual.html#Comparison-with-ntpd[Comparison with
-ntpd] section in the manual.
-
-If your computer is connected to the internet only for few minutes at a time,
+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+
+on an isolated network with no hardware reference clocks in sight, `chrony`
 will probably work much better for you.
 
-The original reason +chrony+ was written was that +ntpd+ (called +xntpd+ at the
-time) could not to do anything sensible on a PC which was connected to the 'net
-only for about 5 minutes once or twice a day, mainly to upload/download email
-and news.  The requirements were
-
-* slew the time to correct it when going online and NTP servers
-  become visible
-* determine the rate at which the computer gains or loses time and
-  use this information to keep it reasonably correct between connects
-  to the 'net.  This has to be done using a method that does not care
-  about the intermittent availability of the references or the fact
-  the computer is turned off between groups of measurements.
-* maintain the time across reboots, by working out the error and
-  drift rate of the computer's real-time clock and using this
-  information to set the system clock correctly at boot up.
-
-Also, when working with isolated networks with no true time references at all
-+ntpd+ was found to give no help with managing the local clock's gain/loss rate
-on the NTP master node (which was set from watch).  Some automated support was
-added to +chrony+ to deal with this.
+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
+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 stabilize the initial synchronisation on the next start, the estimated drift
-of the system clock is saved by adding the +driftfile+ directive.
+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
+`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 on Linux, so
-the system time is reasonably close to the true time when it's initialized on
-the next boot from the RTC, the +rtcsync+ directive enables a kernel mode in
-which the system time is copied to the RTC every 11 minutes.
+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 initialized 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
+http://www.pool.ntp.org/[pool.ntp.org] project, the minimal _chrony.conf_ file
 could be:
 
 ----
@@ -83,15 +77,15 @@ 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
+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 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 master, with
-the others as clients of it.  Add a +local+ directive to the master's
-'chrony.conf' file.  This configuration will be better because
+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
@@ -100,79 +94,84 @@ the others as clients of it.  Add a +local+ directive to the master's
 
 === 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 hostnames specified in the +server+ and +peer+ directives in
-increasing intervals until it succeeds.  The +online+ command can be
-issued from +chronyc+ to try to resolve them immediately.
+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 try to resolve them immediately.
 
-=== How can I make +chronyd+ more secure?
+=== 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
+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
+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.
+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.
+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
+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.
+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
+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
+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
+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 falsetickers and combine
-measurements from multiple sources.
+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.
 
-There are also useful options which can be set in the +server+ directive, they
-are +minpoll+, +maxpoll+, +polltarget+, +maxdelay+, +maxdelayratio+ and
-+maxdelaydevratio+.
+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 6 (samples) for +polltarget+.  The default values should be used
-for general servers on the internet.  With your own NTP servers or if have
+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 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 on many factors, including the ratio
-between the wander of the clock and the network jitter (sometimes expressed in
-NTP documents as the Allan intercept), the temperature sensitivity of the
-crystal oscillator and the maximum rate of change of the temperature.
+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).
 
-An example of the directive for an NTP server on the internet that you are
+An example of the directive for an NTP server on the Internet that you are
 allowed to poll frequently could be
 
 ----
@@ -188,96 +187,139 @@ server ntp.local minpoll 2 maxpoll 4 polltarget 30
 
 The maxdelay options are useful to ignore measurements with larger 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
+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
 ----
 
-=== What happened to the +commandkey+ and +generatecommandkey+ directives?
+If your server supports the interleaved mode, the `xleave` option should be
+added to the `server` directive in order to receive server's more accurate
+hardware or kernel transmit timestamps. When combined with local hardware
+timestamping, a sub-microsecond accuracy may be possible. An example could be
 
-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 same host as +chronyd+ is running.
+----
+server ntp.local minpoll 2 maxpoll 2 xleave
+hwtimestamp eth0
+----
+
+=== 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
+This is the most common problem. There are a number of reasons, see the
 following questions.
 
 === Behind a firewall?
 
-If there is a firewall between you and the NTP server you're trying to use, the
-packets may be blocked.  Try using a tool like +wireshark+ or +tcpdump+ to see if
-you're getting responses from the server.  If you have an external modem, see
-if the receive light blinks straight after the transmit light (when the link is
-quiet apart from the NTP traffic.)  Try adding +log measurements+ to the
-'chrony.conf' file and look in the 'measurements.log' file after +chronyd+ has
-been running for a short period. See if any measurements appear.
+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.
 
-=== Are NTP servers specified with the +offline+ option?
+When `chronyd` is receiving responses from the servers, the output of the
+`sources` command issued few minutes after `chronyd` start might look like
+this:
 
-Check that you're using +chronyc+\'s +online+ and +offline+ commands
-appropriately.  Again, check in 'measurements.log' to see if you're getting any
+----
+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. Again, check in _measurements.log_ to see if you're getting any
 data back from the server.
 
-=== Is +chronyd+ allowed to step the system clock?
+=== 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 correct 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
+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
+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 RTC or virtual
-machine which can be suspended and resumed with incorrect time) it may be
-necessary to allow the step at any clock update.  The example above would
-change to
+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
 ----
 
-== Issues with +chronyc+
+== Issues with `chronyc`
 
-=== I keep getting the error +506 Cannot talk to daemon+
+=== 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.
+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 `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.
+323/udp. You need to amend the firewall configuration in this case.
 
-=== I keep getting the error +501 Not authorised+
+=== I keep getting the error `501 Not authorised`
 
-Since version 2.2, the +password+ command doesn't do anything and +chronyc+
-needs to run under the root or chrony user, which are allowed to access the
-Unix domain command socket.
+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.
 
-=== Is the +chronyc+ / +chronyd+ protocol documented anywhere?
+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).
 
-Only by the source code :-) See 'cmdmon.c' (+chronyd+ side) and 'client.c'
-(+chronyc+ side).
+=== 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
 
@@ -287,96 +329,95 @@ This is the clock which keeps the time even when your computer is turned off.
 It is used to initialize 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
+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 initialized from
 it on the next boot.
 
-The other option is to use the +rtcfile+ directive, which will tell +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
+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.
+`chronyd` is started on boot. See the documentation for details.
 
-=== I want to use +chronyd+'s RTC support. Must I disable +hwclock+?
+=== 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
+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+
+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
+=== I just keep getting the `513 RTC driver not running` message
 
-For the real time clock support to work, you need the following three
+For the real-time clock support to work, you need the following three
 things
 
-* a kernel that is supported (e.g. 2.2 onwards)
-* enhanced RTC support compiled into the kernel
-* an +rtcfile+ directive in your 'chrony.conf' file
+* an RTC in your computer
+* a Linux kernel with enabled RTC support
+* an `rtcfile` directive in your _chrony.conf_ file
 
-== NTP-specific issues
-
-=== Can +chronyd+ be driven from broadcast NTP servers?
-
-No, the broadcast client mode is not supported and there is currently no plan
-to implement it.  The broadcast and multicast modes are inherently less
-accurate and less secure (even with authentication) than the ordinary
-server/client mode and they are not as useful as they used to be.  Even with
-very modest hardware a single NTP server can serve time to hundreds of
-thousands of clients using the ordinary 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?
-
-This is not possible as the program currently stands.
-
-=== What happens if the network connection is dropped without using +chronyc+'s +offline+ command first?
-
-+chronyd+ will keep trying to access the server(s) that it thinks are online.
-When the network is connected again, it will take some time (on average half of
-the current polling interval) before new measurements are made and the clock is
-corrected. If the servers were set to offline and the +online+ command was
-issued when the network was connected, +chronyd+ would make new measurements
-immediately.
-
-The +auto_offline+ option to the +server+ entry in the 'chrony.conf' file may
-be useful to switch the servers to the offline state automatically.
-
-== Linux-specific issues
-
-=== I get +Could not open /dev/rtc, Device or resource busy+ in my syslog 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.
 
-== Microsoft Windows
+== NTP-specific issues
 
-=== Does +chrony+ support Windows?
+=== Can `chronyd` be driven from broadcast NTP servers?
 
-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'
+No, the broadcast client mode is not supported and there is currently no plan
+to implement it. The broadcast and multicast modes are inherently less
+accurate and less secure (even with authentication) than the ordinary
+server/client mode and they are not as useful as they used to be. Even with
+very modest hardware a single NTP server can serve time to hundreds of
+thousands of clients using the ordinary 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 server(s) that it thinks are online.
+When the network is connected again, it will take some time (on average half of
+the maximum polling interval) before new measurements are made and the clock is
+corrected. If the servers were set to offline and the `online` command was
+issued when the network was connected, `chronyd` would make new measurements
+immediately.
+
+The `auto_offline` option to the `server` entry in the _chrony.conf_ file may
+be useful to switch the servers to the offline state automatically.
+
+== 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
+We have no plans to do this. Anyone is welcome to pick this work up and
 contribute it back to the project.

doc/installation.adoc

@@ -0,0 +1,189 @@
+// 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.
+
+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
+a single 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 CFLAGS=-O ./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 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`.
+
+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 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 install 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.

examples/chrony-wait.service

@@ -9,7 +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 waitsync 600 0.1 0.0 1
+ExecStart=/usr/bin/chronyc -h 127.0.0.1,::1 waitsync 600 0.1 0.0 1
 RemainAfterExit=yes
 StandardOutput=null
 

examples/chrony.spec

@@ -10,7 +10,6 @@ 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).
@@ -28,29 +27,20 @@ manual input as time references.
 	--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/chronyc.1.gz
 %{_mandir}/man5/chrony.conf.5.gz
 %{_mandir}/man8/chronyd.8.gz
-%doc README
-%doc chrony.txt
-%doc COPYING
+%doc README FAQ NEWS COPYING
 %doc examples/chrony.conf.example*
 %doc examples/chrony.keys.example
 

hwclock.c

@@ -0,0 +1,208 @@
+/*
+  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.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  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"
+
+/* Maximum number of samples per clock */
+#define MAX_SAMPLES 16
+
+/* Minimum interval between samples (in seconds) */
+#define MIN_SAMPLE_SEPARATION 1.0
+
+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[MAX_SAMPLES];
+  double y_data[MAX_SAMPLES];
+
+  /* Number of samples */
+  int n_samples;
+
+  /* Maximum error of the last sample */
+  double last_err;
+
+  /* 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(void)
+{
+  HCL_Instance clock;
+
+  clock = MallocNew(struct HCL_Instance_Record);
+  clock->x_data[MAX_SAMPLES - 1] = 0.0;
+  clock->y_data[MAX_SAMPLES - 1] = 0.0;
+  clock->n_samples = 0;
+  clock->valid_coefs = 0;
+
+  LCL_AddParameterChangeHandler(handle_slew, clock);
+
+  return clock;
+}
+
+/* ================================================== */
+
+void HCL_DestroyInstance(HCL_Instance clock)
+{
+  LCL_RemoveParameterChangeHandler(handle_slew, clock);
+  Free(clock);
+}
+
+/* ================================================== */
+
+int
+HCL_NeedsNewSample(HCL_Instance clock, struct timespec *now)
+{
+  if (!clock->n_samples ||
+      fabs(UTI_DiffTimespecsToDouble(now, &clock->local_ref)) >= MIN_SAMPLE_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 >= 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 < MIN_SAMPLE_SEPARATION / 2.0) {
+      clock->n_samples = 0;
+      DEBUG_LOG(LOGF_HwClocks, "HW clock reset interval=%f", local_delta);
+    }
+
+    for (i = MAX_SAMPLES - clock->n_samples; i < 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 + MAX_SAMPLES - clock->n_samples,
+                                 clock->y_data + MAX_SAMPLES - clock->n_samples,
+                                 clock->n_samples, 1.0e-9, &clock->offset, &raw_freq,
+                                 &n_runs, &best_start);
+
+  if (!clock->valid_coefs) {
+    DEBUG_LOG(LOGF_HwClocks, "HW clock needs more samples");
+    return;
+  }
+
+  clock->frequency = raw_freq / local_freq;
+
+  /* Drop unneeded samples */
+  clock->n_samples -= best_start;
+
+  /* If the fit doesn't cross the error interval of the last sample, throw away
+     all previous samples and keep only the frequency estimate */
+  if (fabs(clock->offset) > err) {
+    DEBUG_LOG(LOGF_HwClocks, "HW clock reset offset=%e", clock->offset);
+    clock->offset = 0.0;
+    clock->n_samples = 1;
+  }
+
+  DEBUG_LOG(LOGF_HwClocks, "HW clock samples=%d offset=%e freq=%.9e raw_freq=%.9e err=%e ref_diff=%e",
+            clock->n_samples, clock->offset, clock->frequency, raw_freq, 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 = clock->offset + elapsed / clock->frequency;
+  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;
+}

hwclock.h

@@ -0,0 +1,48 @@
+/*
+  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(void);
+
+/* 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

keys.c

@@ -103,9 +103,9 @@ static int
 determine_hash_delay(uint32_t key_id)
 {
   NTP_Packet pkt;
-  struct timeval before, after;
-  unsigned long usecs, min_usecs=0;
-  int i;
+  struct timespec before, after;
+  double diff, min_diff;
+  int i, nsecs;
 
   for (i = 0; i < 10; i++) {
     LCL_ReadRawTime(&before);
@@ -113,19 +113,49 @@ determine_hash_delay(uint32_t key_id)
         (unsigned char *)&pkt.auth_data, sizeof (pkt.auth_data));
     LCL_ReadRawTime(&after);
 
-    usecs = (after.tv_sec - before.tv_sec) * 1000000 + (after.tv_usec - before.tv_usec);
+    diff = UTI_DiffTimespecsToDouble(&after, &before);
 
-    if (i == 0 || usecs < min_usecs) {
-      min_usecs = usecs;
-    }
+    if (i == 0 || min_diff > diff)
+      min_diff = diff;
   }
 
   /* Add on a bit extra to allow for copying, conversions etc */
-  min_usecs += min_usecs >> 4;
+  nsecs = 1.0625e9 * min_diff;
 
-  DEBUG_LOG(LOGF_Keys, "authentication delay for key %"PRIu32": %ld useconds", key_id, min_usecs);
+  DEBUG_LOG(LOGF_Keys, "authentication delay for key %"PRIu32": %d nsecs", key_id, nsecs);
 
-  return min_usecs;
+  return nsecs;
+}
+
+/* ================================================== */
+/* 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;
+  }
 }
 
 /* ================================================== */
@@ -192,7 +222,7 @@ KEY_Reload(void)
       continue;
     }
 
-    key.len = UTI_DecodePasswordFromText(keyval);
+    key.len = decode_password(keyval);
     if (!key.len) {
       LOG(LOGS_WARN, LOGF_Keys, "Could not decode password in key %"PRIu32, key_id);
       continue;
@@ -292,6 +322,22 @@ KEY_GetAuthDelay(uint32_t key_id)
 
 /* ================================================== */
 
+int
+KEY_GetAuthLength(uint32_t key_id)
+{
+  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)
 {
@@ -307,6 +353,31 @@ KEY_CheckKeyLength(uint32_t key_id)
 
 /* ================================================== */
 
+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);
+}
+
+/* ================================================== */
+
+static int
+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)
@@ -318,15 +389,15 @@ KEY_GenerateAuth(uint32_t key_id, const unsigned char *data, int data_len,
   if (!key)
     return 0;
 
-  return UTI_GenerateNTPAuth(key->hash_id, (unsigned char *)key->val,
-                             key->len, data, data_len, auth, auth_len);
+  return generate_ntp_auth(key->hash_id, (unsigned char *)key->val, key->len,
+                           data, data_len, auth, auth_len);
 }
 
 /* ================================================== */
 
 int
 KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
-    const unsigned char *auth, int auth_len)
+              const unsigned char *auth, int auth_len, int trunc_len)
 {
   Key *key;
 
@@ -335,6 +406,6 @@ KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
   if (!key)
     return 0;
 
-  return UTI_CheckNTPAuth(key->hash_id, (unsigned char *)key->val,
-                          key->len, data, data_len, auth, auth_len);
+  return check_ntp_auth(key->hash_id, (unsigned char *)key->val, key->len,
+                        data, data_len, auth, auth_len, trunc_len);
 }

keys.h

@@ -37,11 +37,12 @@ extern void KEY_Reload(void);
 extern int KEY_GetKey(uint32_t key_id, char **key, int *len);
 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,
     int data_len, unsigned char *auth, int auth_len);
-extern int KEY_CheckAuth(uint32_t key_id, const unsigned char *data,
-    int data_len, const unsigned char *auth, int auth_len);
+extern int KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
+                         const unsigned char *auth, int auth_len, int trunc_len);
 
 #endif /* GOT_KEYS_H */

local.c

@@ -42,13 +42,12 @@
 
 /* ================================================== */
 
-/* Maximum allowed frequency offset in ppm, the time must not stop
-   or run backwards */
-#define MAX_FREQ 500000.0
-
 /* 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;
 
@@ -107,37 +106,42 @@ 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 timeval tv, old_tv;
-  int dusec, best_dusec;
-  int iters;
+  struct timespec ts, old_ts;
+  int iters, diff, best;
 
-  gettimeofday(&old_tv, NULL);
-  best_dusec = 1000000; /* Assume we must be better than a second */
+  LCL_ReadRawTime(&old_ts);
+
+  /* Assume we must be better than a second */
+  best = NSEC_PER_SEC;
   iters = 0;
+
   do {
-    gettimeofday(&tv, NULL);
-    dusec = 1000000*(tv.tv_sec - old_tv.tv_sec) + (tv.tv_usec - old_tv.tv_usec);
-    old_tv = tv;
-    if (dusec > 0)  {
-      if (dusec < best_dusec) {
-        best_dusec = dusec;
-      }
+    LCL_ReadRawTime(&ts);
+
+    diff = NSEC_PER_SEC * (ts.tv_sec - old_ts.tv_sec) + (ts.tv_nsec - old_ts.tv_nsec);
+
+    old_ts = ts;
+    if (diff > 0) {
+      if (diff < best)
+        best = diff;
       iters++;
     }
   } while (iters < NITERS);
 
-  assert(best_dusec > 0);
+  assert(best > 0);
 
-  precision_quantum = best_dusec * 1.0e-6;
+  precision_quantum = 1.0e-9 * best;
 
   /* Get rounded log2 value of the measured precision */
   precision_log = 0;
-  while (best_dusec < 707107) {
+  while (best < 707106781) {
     precision_log--;
-    best_dusec *= 2;
+    best *= 2;
   }
 
   DEBUG_LOG(LOGF_Local, "Clock precision %.9f (%d)", precision_quantum, precision_log);
@@ -166,6 +170,11 @@ 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;
 }
 
@@ -274,7 +283,7 @@ LCL_IsFirstParameterChangeHandler(LCL_ParameterChangeHandler handler)
 /* ================================================== */
 
 static void
-invoke_parameter_change_handlers(struct timeval *raw, struct timeval *cooked,
+invoke_parameter_change_handlers(struct timespec *raw, struct timespec *cooked,
                                  double dfreq, double doffset,
                                  LCL_ChangeType change_type)
 {
@@ -341,23 +350,29 @@ void LCL_RemoveDispersionNotifyHandler(LCL_DispersionNotifyHandler handler, void
 }
 
 /* ================================================== */
-/* 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)
+LCL_ReadRawTime(struct timespec *ts)
 {
-  if (gettimeofday(result, NULL) < 0) {
-    LOG_FATAL(LOGF_Local, "gettimeofday() failed");
-  }
+#if HAVE_CLOCK_GETTIME
+  if (clock_gettime(CLOCK_REALTIME, ts) < 0)
+    LOG_FATAL(LOGF_Local, "clock_gettime() failed : %s", strerror(errno));
+#else
+  struct timeval tv;
+
+  if (gettimeofday(&tv, NULL) < 0)
+    LOG_FATAL(LOGF_Local, "gettimeofday() failed : %s", strerror(errno));
+
+  UTI_TimevalToTimespec(&tv, ts);
+#endif
 }
 
 /* ================================================== */
 
 void
-LCL_ReadCookedTime(struct timeval *result, double *err)
+LCL_ReadCookedTime(struct timespec *result, double *err)
 {
-  struct timeval raw;
+  struct timespec raw;
 
   LCL_ReadRawTime(&raw);
   LCL_CookTime(&raw, result, err);
@@ -366,18 +381,18 @@ LCL_ReadCookedTime(struct timeval *result, double *err)
 /* ================================================== */
 
 void
-LCL_CookTime(struct timeval *raw, struct timeval *cooked, double *err)
+LCL_CookTime(struct timespec *raw, struct timespec *cooked, double *err)
 {
   double correction;
 
   LCL_GetOffsetCorrection(raw, &correction, err);
-  UTI_AddDoubleToTimeval(raw, correction, cooked);
+  UTI_AddDoubleToTimespec(raw, correction, cooked);
 }
 
 /* ================================================== */
 
 void
-LCL_GetOffsetCorrection(struct timeval *raw, double *correction, double *err)
+LCL_GetOffsetCorrection(struct timespec *raw, double *correction, double *err)
 {
   /* Call system specific driver to get correction */
   (*drv_offset_convert)(raw, correction, err);
@@ -406,18 +421,18 @@ LCL_ReadAbsoluteFrequency(void)
 static double
 clamp_freq(double freq)
 {
-  if (freq <= MAX_FREQ && freq >= -MAX_FREQ)
+  if (freq <= max_freq_ppm && freq >= -max_freq_ppm)
     return freq;
 
   LOG(LOGS_WARN, LOGF_Local, "Frequency %.1f ppm exceeds allowed maximum", freq);
 
-  return freq >= MAX_FREQ ? MAX_FREQ : -MAX_FREQ;
+  return CLAMP(-max_freq_ppm, freq, max_freq_ppm);
 }
 
 /* ================================================== */
 
 static int
-check_offset(struct timeval *now, double offset)
+check_offset(struct timespec *now, double offset)
 {
   /* Check if the time will be still sane with accumulated offset */
   if (UTI_IsTimeOffsetSane(now, -offset))
@@ -435,7 +450,7 @@ check_offset(struct timeval *now, double offset)
 void
 LCL_SetAbsoluteFrequency(double afreq_ppm)
 {
-  struct timeval raw, cooked;
+  struct timespec raw, cooked;
   double dfreq;
   
   afreq_ppm = clamp_freq(afreq_ppm);
@@ -466,7 +481,7 @@ LCL_SetAbsoluteFrequency(double afreq_ppm)
 void
 LCL_AccumulateDeltaFrequency(double dfreq)
 {
-  struct timeval raw, cooked;
+  struct timespec raw, cooked;
   double old_freq_ppm;
 
   old_freq_ppm = current_freq_ppm;
@@ -495,7 +510,7 @@ LCL_AccumulateDeltaFrequency(double dfreq)
 void
 LCL_AccumulateOffset(double offset, double corr_rate)
 {
-  struct timeval raw, cooked;
+  struct timespec 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 */
@@ -517,7 +532,7 @@ LCL_AccumulateOffset(double offset, double corr_rate)
 int
 LCL_ApplyStepOffset(double offset)
 {
-  struct timeval raw, cooked;
+  struct timespec 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 */
@@ -545,7 +560,7 @@ LCL_ApplyStepOffset(double offset)
 /* ================================================== */
 
 void
-LCL_NotifyExternalTimeStep(struct timeval *raw, struct timeval *cooked,
+LCL_NotifyExternalTimeStep(struct timespec *raw, struct timespec *cooked,
     double offset, double dispersion)
 {
   /* Dispatch to all handlers */
@@ -559,7 +574,7 @@ LCL_NotifyExternalTimeStep(struct timeval *raw, struct timeval *cooked,
 void
 LCL_NotifyLeap(int leap)
 {
-  struct timeval raw, cooked;
+  struct timespec raw, cooked;
 
   LCL_ReadRawTime(&raw);
   LCL_CookTime(&raw, &cooked, NULL);
@@ -576,7 +591,7 @@ LCL_NotifyLeap(int leap)
 void
 LCL_AccumulateFrequencyAndOffset(double dfreq, double doffset, double corr_rate)
 {
-  struct timeval raw, cooked;
+  struct timespec raw, cooked;
   double old_freq_ppm;
 
   LCL_ReadRawTime(&raw);
@@ -653,7 +668,7 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
 int
 LCL_MakeStep(void)
 {
-  struct timeval raw;
+  struct timespec raw;
   double correction;
 
   LCL_ReadRawTime(&raw);

local.h

@@ -31,9 +31,8 @@
 
 #include "sysincl.h"
 
-/* Read the system clock.  This is analogous to gettimeofday(),
-   but with the timezone information ignored */
-extern void LCL_ReadRawTime(struct timeval *);
+/* Read the system clock */
+extern void LCL_ReadRawTime(struct timespec *ts);
 
 /* Read the system clock, corrected according to all accumulated
    drifts and uncompensated offsets.
@@ -44,15 +43,15 @@ extern void LCL_ReadRawTime(struct timeval *);
    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 timeval *t, double *err);
+extern void LCL_ReadCookedTime(struct timespec *ts, double *err);
 
 /* Convert raw time to cooked. */
-extern void LCL_CookTime(struct timeval *raw, struct timeval *cooked, double *err);
+extern void LCL_CookTime(struct timespec *raw, struct timespec *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 timeval *raw, double *correction, double *err);
+extern void LCL_GetOffsetCorrection(struct timespec *raw, double *correction, double *err);
 
 /* Type of routines that may be invoked as callbacks when there is a
    change to the frequency or offset.
@@ -79,7 +78,7 @@ typedef enum {
 } LCL_ChangeType;
 
 typedef void (*LCL_ParameterChangeHandler)
-     (struct timeval *raw, struct timeval *cooked,
+     (struct timespec *raw, struct timespec *cooked,
       double dfreq,
       double doffset,
       LCL_ChangeType change_type,
@@ -163,7 +162,7 @@ extern int LCL_ApplyStepOffset(double offset);
 
 /* Routine to invoke notify handlers on an unexpected time jump
    in system clock */
-extern void LCL_NotifyExternalTimeStep(struct timeval *raw, struct timeval *cooked,
+extern void LCL_NotifyExternalTimeStep(struct timespec *raw, struct timespec *cooked,
     double offset, double dispersion);
 
 /* Routine to invoke notify handlers on leap second when the system clock

localp.h

@@ -52,7 +52,7 @@ typedef int (*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 timeval *raw, double *corr, double *err);
+typedef void (*lcl_OffsetCorrectionDriver)(struct timespec *raw, double *corr, double *err);
 
 /* System driver to schedule leap second */
 typedef void (*lcl_SetLeapDriver)(int leap);

logging.c

@@ -238,12 +238,18 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
     return;
 
   if (!logfiles[id].file) {
-    char filename[512];
+    char filename[512], *logdir = CNF_GetLogDir();
+
+    if (logdir[0] == '\0') {
+      LOG(LOGS_WARN, LOGF_Logging, "logdir not specified");
+      logfiles[id].name = NULL;
+      return;
+    }
 
     if (snprintf(filename, sizeof(filename), "%s/%s.log",
-          CNF_GetLogDir(), logfiles[id].name) >= sizeof(filename) ||
+                 logdir, logfiles[id].name) >= sizeof (filename) ||
         !(logfiles[id].file = fopen(filename, "a"))) {
-      LOG(LOGS_WARN, LOGF_Refclock, "Couldn't open logfile %s for update", filename);
+      LOG(LOGS_WARN, LOGF_Logging, "Could not open log file %s", filename);
       logfiles[id].name = NULL;
       return;
     }

logging.h

@@ -47,10 +47,10 @@ extern int log_debug_enabled;
 
 #if DEBUG > 0
 #define LOG_MESSAGE(severity, facility, ...) \
-  LOG_Message(severity, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__);
+  LOG_Message(severity, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__)
 #else
 #define LOG_MESSAGE(severity, facility, ...) \
-  LOG_Message(severity, __VA_ARGS__);
+  LOG_Message(severity, __VA_ARGS__)
 #endif
 
 #define DEBUG_LOG(facility, ...) \
@@ -82,7 +82,9 @@ typedef enum {
 typedef enum {
   LOGF_Reference,
   LOGF_NtpIO,
+  LOGF_NtpIOLinux,
   LOGF_NtpCore,
+  LOGF_NtpSignd,
   LOGF_NtpSources,
   LOGF_Scheduler,
   LOGF_SourceStats,
@@ -114,6 +116,7 @@ typedef enum {
   LOGF_TempComp,
   LOGF_RtcLinux,
   LOGF_Refclock,
+  LOGF_HwClocks,
   LOGF_Smooth,
 } LOG_Facility;
 

main.c

@@ -35,6 +35,7 @@
 #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"
@@ -107,6 +108,7 @@ MAI_CleanupAndExit(void)
   TMC_Finalise();
   MNL_Finalise();
   CLG_Finalise();
+  NSD_Finalise();
   NSR_Finalise();
   SST_Finalise();
   NCR_Finalise();
@@ -143,6 +145,16 @@ 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)
 {
@@ -156,6 +168,7 @@ ntp_source_resolving_end(void)
     SRC_ReloadSources();
   }
 
+  SRC_RemoveDumpFiles();
   RTC_StartMeasurements();
   RCL_StartRefclocks();
   NSR_StartSources();
@@ -294,14 +307,14 @@ go_daemon(void)
   /* 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(LOGF_Logging, "Could not detach, pipe failed : %s", strerror(errno));
+    LOG_FATAL(LOGF_Main, "Could not detach, pipe failed : %s", strerror(errno));
   }
 
   /* Does this preserve existing signal handlers? */
   pid = fork();
 
   if (pid < 0) {
-    LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno));
+    LOG_FATAL(LOGF_Main, "Could not detach, fork failed : %s", strerror(errno));
   } else if (pid > 0) {
     /* In the 'grandparent' */
     char message[1024];
@@ -326,7 +339,7 @@ go_daemon(void)
     pid = fork();
 
     if (pid < 0) {
-      LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno));
+      LOG_FATAL(LOGF_Main, "Could not detach, fork failed : %s", strerror(errno));
     } else if (pid > 0) {
       exit(0); /* In the 'parent' */
     } else {
@@ -334,7 +347,7 @@ go_daemon(void)
 
       /* Change current directory to / */
       if (chdir("/") < 0) {
-        LOG_FATAL(LOGF_Logging, "Could not chdir to / : %s", strerror(errno));
+        LOG_FATAL(LOGF_Main, "Could not chdir to / : %s", strerror(errno));
       }
 
       /* Don't keep stdin/out/err from before. But don't close
@@ -359,7 +372,7 @@ int main
   char *user = NULL;
   struct passwd *pw;
   int debug = 0, nofork = 0, address_family = IPADDR_UNSPEC;
-  int do_init_rtc = 0, restarted = 0;
+  int do_init_rtc = 0, restarted = 0, timeout = 0;
   int other_pid;
   int scfilter_level = 0, lock_memory = 0, sched_priority = 0;
   int system_log = 1;
@@ -417,12 +430,16 @@ int main
       ref_mode = REF_ModePrintOnce;
       nofork = 1;
       system_log = 0;
+    } else if (!strcmp("-t", *argv)) {
+      ++argv, --argc;
+      if (argc == 0 || sscanf(*argv, "%d", &timeout) != 1 || timeout <= 0)
+        LOG_FATAL(LOGF_Main, "Bad timeout");
     } else if (!strcmp("-4", *argv)) {
       address_family = IPADDR_INET4;
     } else if (!strcmp("-6", *argv)) {
       address_family = IPADDR_INET6;
     } else if (!strcmp("-h", *argv) || !strcmp("--help", *argv)) {
-      printf("Usage: %s [-4|-6] [-n|-d] [-q|-Q] [-r] [-R] [-s] [-f FILE|COMMAND...]\n",
+      printf("Usage: %s [-4|-6] [-n|-d] [-q|-Q] [-r] [-R] [-s] [-t TIMEOUT] [-f FILE|COMMAND...]\n",
              progname);
       return 0;
     } else if (*argv[0] == '-') {
@@ -523,6 +540,7 @@ int main
   REF_Initialise();
   SST_Initialise();
   NSR_Initialise();
+  NSD_Initialise();
   CLG_Initialise();
   MNL_Initialise();
   TMC_Initialise();
@@ -545,6 +563,9 @@ int main
   REF_SetModeEndHandler(reference_mode_end);
   REF_SetMode(ref_mode);
 
+  if (timeout)
+    SCH_AddTimeoutByDelay(timeout, quit_timeout, NULL);
+
   if (do_init_rtc) {
     RTC_TimeInit(post_init_rtc_hook, NULL);
   } else {

make_release

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-LANG=C
+LANG=C.UTF-8
 export LANG
 
 if [ $# -ne 1 ]; then
@@ -11,7 +11,6 @@ fi
 version=$1
 tag=$version
 subdir=chrony-${version}
-mandate=$(date +'%B %Y')
 
 umask 022
 
@@ -39,29 +38,13 @@ echo $version > version.txt
 
 sed -i -e "s%@@VERSION@@%${version}%" examples/chrony.spec
 
-for m in chronyc.1.in chrony.conf.5.in chronyd.8.in; do
-  sed -e "s%@VERSION@%${version}%;s%@MAN_DATE@%${mandate}%" \
-    < $m > ${m}_
-  mv -f ${m}_ $m
-done
+./configure && make -C doc man txt || exit 1
 
-./configure && make chrony.txt getdate.c || exit 1
-
-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 120 -o $(wc -l < INSTALL) -lt 85 ]; then
-  echo "INSTALL generated incorrectly?"
-  exit 3
-fi
-
-a2x --lynx -f text doc/faq.adoc || exit 1
-mv doc/faq.text FAQ
-rm -rf doc
+iconv -f utf-8 -t ascii//TRANSLIT < doc/installation.txt > INSTALL
+iconv -f utf-8 -t ascii//TRANSLIT < doc/faq.txt > FAQ
 
 make distclean
-rm -f config.h config.log make_release .gitignore
+rm -f make_release .gitignore
 
 cd ..
 tar cv --owner root --group root $subdir | gzip -9 > ${subdir}.tar.gz

manual.c

@@ -47,7 +47,7 @@ static int enabled = 0;
 
 /* More recent samples at highest indices */
 typedef struct {
-  struct timeval when; /* This is our 'cooked' time */
+  struct timespec 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
@@ -64,8 +64,8 @@ static int n_samples;
 /* ================================================== */
 
 static void
-slew_samples(struct timeval *raw,
-             struct timeval *cooked, 
+slew_samples(struct timespec *raw,
+             struct timespec *cooked,
              double dfreq,
              double doffset,
              LCL_ChangeType change_type,
@@ -97,7 +97,7 @@ MNL_Finalise(void)
 /* ================================================== */
 
 static void
-estimate_and_set_system(struct timeval *now, int offset_provided, double offset, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
+estimate_and_set_system(struct timespec *now, int offset_provided, double offset, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
 {
   double agos[MAX_SAMPLES], offsets[MAX_SAMPLES];
   double b0, b1;
@@ -110,7 +110,7 @@ estimate_and_set_system(struct timeval *now, int offset_provided, double offset,
 
   if (n_samples > 1) {
     for (i=0; i<n_samples; i++) {
-      UTI_DiffTimevalsToDouble(&agos[i], &samples[n_samples-1].when, &samples[i].when);
+      agos[i] = UTI_DiffTimespecsToDouble(&samples[n_samples - 1].when, &samples[i].when);
       offsets[i] = samples[i].offset;
     }
     
@@ -173,9 +173,9 @@ estimate_and_set_system(struct timeval *now, int offset_provided, double offset,
 /* ================================================== */
 
 int
-MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
+MNL_AcceptTimestamp(struct timespec *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm)
 {
-  struct timeval now;
+  struct timespec now;
   double offset, diff;
   int i;
 
@@ -189,12 +189,12 @@ MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, doub
      return 0;
 
     if (n_samples) {
-      UTI_DiffTimevalsToDouble(&diff, &now, &samples[n_samples - 1].when);
+      diff = UTI_DiffTimespecsToDouble(&now, &samples[n_samples - 1].when);
       if (diff < MIN_SAMPLE_SEPARATION)
         return 0;
     }
 
-    UTI_DiffTimevalsToDouble(&offset, &now, ts);
+    offset = UTI_DiffTimespecsToDouble(&now, ts);
 
     /* Check if buffer full up */
     if (n_samples == MAX_SAMPLES) {
@@ -224,8 +224,8 @@ MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, doub
 /* ================================================== */
 
 static void
-slew_samples(struct timeval *raw,
-             struct timeval *cooked, 
+slew_samples(struct timespec *raw,
+             struct timespec *cooked,
              double dfreq,
              double doffset,
              LCL_ChangeType change_type,
@@ -239,7 +239,7 @@ slew_samples(struct timeval *raw,
   }
 
   for (i=0; i<n_samples; i++) {
-    UTI_AdjustTimeval(&samples[i].when, cooked, &samples[i].when, &delta_time,
+    UTI_AdjustTimespec(&samples[i].when, cooked, &samples[i].when, &delta_time,
         dfreq, doffset);
     samples[i].offset += delta_time;
   }
@@ -309,7 +309,7 @@ int
 MNL_DeleteSample(int index)
 {
   int i;
-  struct timeval now;
+  struct timespec now;
 
   if ((index < 0) || (index >= n_samples)) {
     return 0;

manual.h

@@ -33,7 +33,7 @@
 
 extern void MNL_Initialise(void);
 extern void MNL_Finalise(void);
-extern int MNL_AcceptTimestamp(struct timeval *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm);
+extern int MNL_AcceptTimestamp(struct timespec *ts, long *offset_cs, double *dfreq_ppm, double *new_afreq_ppm);
 
 extern void MNL_Enable(void);
 extern void MNL_Disable(void);

nameserv_async.c

@@ -72,7 +72,7 @@ start_resolving(void *anything)
 /* ================================================== */
 
 static void
-end_resolving(void *anything)
+end_resolving(int fd, int event, void *anything)
 {
   struct DNS_Async_Instance *inst = (struct DNS_Async_Instance *)anything;
   int i;
@@ -83,7 +83,7 @@ end_resolving(void *anything)
 
   resolving_threads--;
 
-  SCH_RemoveInputFileHandler(inst->pipe[0]);
+  SCH_RemoveFileHandler(inst->pipe[0]);
   close(inst->pipe[0]);
   close(inst->pipe[1]);
 
@@ -113,6 +113,9 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
     LOG_FATAL(LOGF_Nameserv, "pipe() failed");
   }
 
+  UTI_FdSetCloexec(inst->pipe[0]);
+  UTI_FdSetCloexec(inst->pipe[1]);
+
   resolving_threads++;
   assert(resolving_threads <= 1);
 
@@ -120,7 +123,7 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
     LOG_FATAL(LOGF_Nameserv, "pthread_create() failed");
   }
 
-  SCH_AddInputFileHandler(inst->pipe[0], end_resolving, inst);
+  SCH_AddFileHandler(inst->pipe[0], SCH_FILE_INPUT, end_resolving, inst);
 }
 
 /* ================================================== */

ntp.h

@@ -53,8 +53,12 @@ typedef uint32_t NTP_int32;
 #define NTP_MAX_EXTENSIONS_LENGTH 1024
 
 /* The minimum and maximum supported length of MAC */
-#define NTP_MIN_MAC_LENGTH 16
-#define NTP_MAX_MAC_LENGTH MAX_HASH_LENGTH
+#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 {
@@ -91,7 +95,7 @@ typedef struct {
 
   /* Optional message authentication code (MAC) */
   NTP_int32 auth_keyid;
-  uint8_t auth_data[NTP_MAX_MAC_LENGTH];
+  uint8_t auth_data[NTP_MAX_MAC_LENGTH - 4];
 } NTP_Packet;
 
 #define NTP_NORMAL_PACKET_LENGTH (int)offsetof(NTP_Packet, auth_keyid)

ntp_core.h

@@ -38,6 +38,18 @@ 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;
@@ -58,19 +70,34 @@ 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_ProcessKnown(NTP_Packet *message, struct timeval *now, double now_err, NCR_Instance data, NTP_Local_Address *local_addr, int length);
+extern int NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
+                              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_ProcessUnknown(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
+extern void NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                                 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 timeval *when, double dfreq, double doffset);
+extern void NCR_SlewTimes(NCR_Instance inst, struct timespec *when, double dfreq, double doffset);
 
 /* Take a particular source online (i.e. start sampling it) */
 extern void NCR_TakeSourceOnline(NCR_Instance inst);
@@ -95,7 +122,8 @@ 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 timeval *now);
+extern void NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timespec *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);
@@ -105,6 +133,8 @@ 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);

ntp_io.c

@@ -30,6 +30,7 @@
 
 #include "sysincl.h"
 
+#include "array.h"
 #include "ntp_io.h"
 #include "ntp_core.h"
 #include "ntp_sources.h"
@@ -40,7 +41,12 @@
 #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;
@@ -50,6 +56,31 @@ union sockaddr_in46 {
   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;
@@ -80,7 +111,7 @@ static int initialised=0;
 /* ================================================== */
 
 /* Forward prototypes */
-static void read_from_socket(void *anything);
+static void read_from_socket(int sock_fd, int event, void *anything);
 
 /* ================================================== */
 
@@ -91,8 +122,8 @@ prepare_socket(int family, int port_number, int client_only)
   socklen_t my_addr_len;
   int sock_fd;
   IPAddr bind_address;
-  int on_off = 1;
-  
+  int events = SCH_FILE_INPUT, on_off = 1;
+
   /* Open Internet domain UDP socket for NTP message transmissions */
 
   sock_fd = socket(family, SOCK_DGRAM, 0);
@@ -162,30 +193,38 @@ 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, LOGF_NtpIO, "Could not set reuseaddr socket options");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "SO_REUSEADDR");
     /* 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, LOGF_NtpIO, "Could not set broadcast socket options");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "SO_BROADCAST");
     /* Don't quit - we might survive anyway */
   }
 
 #ifdef SO_TIMESTAMP
   /* Enable receiving of timestamp control messages */
+#ifdef SO_TIMESTAMPNS
+  /* Try nanosecond resolution first */
+  if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMPNS, (char *)&on_off, sizeof(on_off)) < 0)
+#endif
   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");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "SO_TIMESTAMP");
     /* Don't quit - we might survive anyway */
   }
 #endif
 
+#ifdef HAVE_LINUX_TIMESTAMPING
+  NIO_Linux_SetTimestampSocketOptions(sock_fd, client_only, &events);
+#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, LOGF_NtpIO, "Could not set free bind socket option");
+    LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IP_FREEBIND");
   }
 #endif
 
@@ -193,7 +232,7 @@ prepare_socket(int family, int port_number, int client_only)
 #ifdef HAVE_IN_PKTINFO
     /* We want the local IP info on server sockets */
     if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IP_PKTINFO");
       /* Don't quit - we might survive anyway */
     }
 #endif
@@ -203,18 +242,18 @@ prepare_socket(int family, int port_number, int client_only)
 #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, LOGF_NtpIO, "Could not set IPV6_V6ONLY socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_V6ONLY");
     }
 #endif
 
 #ifdef HAVE_IN6_PKTINFO
 #ifdef IPV6_RECVPKTINFO
     if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_RECVPKTINFO");
     }
 #else
     if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_PKTINFO");
     }
 #endif
 #endif
@@ -229,8 +268,8 @@ prepare_socket(int family, int port_number, int client_only)
     return INVALID_SOCK_FD;
   }
 
-  /* Register handler for read events on the socket */
-  SCH_AddInputFileHandler(sock_fd, read_from_socket, (void *)(long)sock_fd);
+  /* Register handler for read and possibly exception events on the socket */
+  SCH_AddFileHandler(sock_fd, events, read_from_socket, NULL);
 
   return sock_fd;
 }
@@ -282,11 +321,38 @@ close_socket(int sock_fd)
   if (sock_fd == INVALID_SOCK_FD)
     return;
 
-  SCH_RemoveInputFileHandler(sock_fd);
+  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)
 {
@@ -295,6 +361,23 @@ NIO_Initialise(int family)
   assert(!initialised);
   initialised = 1;
 
+#ifdef HAVE_LINUX_TIMESTAMPING
+  NIO_Linux_Initialise();
+#else
+  if (1) {
+    double tx_comp, rx_comp;
+    char *name;
+    if (CNF_GetHwTsInterface(0, &name, &tx_comp, &rx_comp))
+      LOG_FATAL(LOGF_NtpIO, "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();
 
@@ -367,6 +450,13 @@ NIO_Finalise(void)
   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;
 }
 
@@ -482,116 +572,174 @@ NIO_IsServerSocket(int sock_fd)
 /* ================================================== */
 
 static void
-read_from_socket(void *anything)
+process_message(struct msghdr *hdr, int length, int sock_fd)
 {
-  /* This should only be called when there is something
-     to read, otherwise it will block. */
-
-  int status, sock_fd;
-  NTP_Receive_Buffer 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;
-  char cmsgbuf[256];
-  struct msghdr msg;
-  struct iovec iov;
+  NTP_Local_Timestamp local_ts;
+  struct timespec sched_ts;
   struct cmsghdr *cmsg;
+  int if_index;
 
-  assert(initialised);
+  SCH_GetLastEventTime(&local_ts.ts, &local_ts.err, NULL);
+  local_ts.source = NTP_TS_DAEMON;
+  sched_ts = local_ts.ts;
 
-  SCH_GetLastEventTime(&now, &now_err, NULL);
+  if (hdr->msg_namelen > sizeof (union sockaddr_in46)) {
+    DEBUG_LOG(LOGF_NtpIO, "Truncated source address");
+    return;
+  }
 
-  iov.iov_base = &message.ntp_pkt;
-  iov.iov_len = sizeof(message);
-  msg.msg_name = &where_from;
-  msg.msg_namelen = sizeof(where_from);
-  msg.msg_iov = &iov;
-  msg.msg_iovlen = 1;
-  msg.msg_control = (void *) cmsgbuf;
-  msg.msg_controllen = sizeof(cmsgbuf);
-  msg.msg_flags = 0;
+  if (hdr->msg_namelen >= sizeof (((struct sockaddr *)hdr->msg_name)->sa_family)) {
+    UTI_SockaddrToIPAndPort((struct sockaddr *)hdr->msg_name,
+                            &remote_addr.ip_addr, &remote_addr.port);
+  } else {
+    remote_addr.ip_addr.family = IPADDR_UNSPEC;
+    remote_addr.port = 0;
+  }
 
-  sock_fd = (long)anything;
-  status = recvmsg(sock_fd, &msg, flags);
+  local_addr.ip_addr.family = IPADDR_UNSPEC;
+  local_addr.sock_fd = sock_fd;
+  if_index = -1;
 
-  /* 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 (hdr->msg_flags & MSG_TRUNC) {
+    DEBUG_LOG(LOGF_NtpIO, "Received truncated message from %s:%d",
+              UTI_IPToString(&remote_addr.ip_addr), remote_addr.port);
+    return;
+  }
 
-  if (status > 0) {
-    if (msg.msg_namelen > sizeof (where_from))
-      LOG_FATAL(LOGF_NtpIO, "Truncated source address");
+  if (hdr->msg_flags & MSG_CTRUNC) {
+    DEBUG_LOG(LOGF_NtpIO, "Truncated control message");
+    /* Continue */
+  }
 
-    UTI_SockaddrToIPAndPort(&where_from.u, &remote_addr.ip_addr, &remote_addr.port);
-
-    local_addr.ip_addr.family = IPADDR_UNSPEC;
-    local_addr.sock_fd = sock_fd;
-
-    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+  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;
+    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_spec_dst.s_addr);
-        local_addr.ip_addr.family = IPADDR_INET4;
-      }
+      memcpy(&ipi, CMSG_DATA(cmsg), sizeof(ipi));
+      local_addr.ip_addr.addr.in4 = ntohl(ipi.ipi_addr.s_addr);
+      local_addr.ip_addr.family = IPADDR_INET4;
+      if_index = ipi.ipi_ifindex;
+    }
 #endif
 
 #ifdef HAVE_IN6_PKTINFO
-      if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
-        struct in6_pktinfo ipi;
+    if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
+      struct in6_pktinfo ipi;
 
-        memcpy(&ipi, CMSG_DATA(cmsg), sizeof(ipi));
-        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;
-      }
+      memcpy(&ipi, CMSG_DATA(cmsg), sizeof(ipi));
+      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;
+      if_index = ipi.ipi6_ifindex;
+    }
 #endif
 
-#ifdef SO_TIMESTAMP
-      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP) {
-        struct timeval tv;
+#ifdef SCM_TIMESTAMP
+    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMP) {
+      struct timeval tv;
+      struct timespec ts;
 
-        memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));
-        LCL_CookTime(&tv, &now, &now_err);
-      }
+      memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));
+      UTI_TimevalToTimespec(&tv, &ts);
+      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;
     }
-
-    DEBUG_LOG(LOGF_NtpIO, "Received %d bytes from %s:%d to %s fd %d",
-              status, UTI_IPToString(&remote_addr.ip_addr), remote_addr.port,
-              UTI_IPToString(&local_addr.ip_addr), local_addr.sock_fd);
-
-    if (status >= NTP_NORMAL_PACKET_LENGTH) {
-
-      NSR_ProcessReceive((NTP_Packet *) &message.ntp_pkt, &now, now_err,
-                         &remote_addr, &local_addr, status);
-
-    } else {
-
-      /* Just ignore the packet if it's not of a recognized length */
-
-    }
+#endif
   }
+
+#ifdef HAVE_LINUX_TIMESTAMPING
+  if (NIO_Linux_ProcessMessage(&remote_addr, &local_addr, &local_ts,
+                               hdr, length, sock_fd, if_index))
+    return;
+#endif
+
+  DEBUG_LOG(LOGF_NtpIO, "Received %d bytes from %s:%d to %s fd=%d if=%d tss=%d delay=%.9f",
+            length, UTI_IPToString(&remote_addr.ip_addr), remote_addr.port,
+            UTI_IPToString(&local_addr.ip_addr), local_addr.sock_fd, if_index,
+            local_ts.source, UTI_DiffTimespecsToDouble(&sched_ts, &local_ts.ts));
+
+  /* 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);
+}
+
+/* ================================================== */
+
+static void
+read_from_socket(int sock_fd, int event, void *anything)
+{
+  /* 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;
+
+  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) {
+    DEBUG_LOG(LOGF_NtpIO, "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 */
 
-static int
-send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)
+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;
-  char cmsgbuf[256];
+  struct cmsghdr *cmsg, cmsgbuf[CMSGBUF_SIZE / sizeof (struct cmsghdr)];
   int cmsglen;
   socklen_t addrlen = 0;
 
@@ -604,11 +752,7 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   }
 
   /* Don't set address with connected socket */
-  if (local_addr->sock_fd == server_sock_fd4 ||
-#ifdef FEAT_IPV6
-      local_addr->sock_fd == server_sock_fd6 ||
-#endif
-      !separate_client_sockets) {
+  if (NIO_IsServerSocket(local_addr->sock_fd) || !separate_client_sockets) {
     addrlen = UTI_IPAndPortToSockaddr(&remote_addr->ip_addr, remote_addr->port,
                                       &remote.u);
     if (!addrlen)
@@ -624,7 +768,7 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   }
 
   iov.iov_base = packet;
-  iov.iov_len = packetlen;
+  iov.iov_len = length;
   msg.msg_iov = &iov;
   msg.msg_iovlen = 1;
   msg.msg_control = cmsgbuf;
@@ -634,7 +778,6 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
 
 #ifdef HAVE_IN_PKTINFO
   if (local_addr->ip_addr.family == IPADDR_INET4) {
-    struct cmsghdr *cmsg;
     struct in_pktinfo *ipi;
 
     cmsg = CMSG_FIRSTHDR(&msg);
@@ -652,7 +795,6 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
 
 #ifdef HAVE_IN6_PKTINFO
   if (local_addr->ip_addr.family == IPADDR_INET6) {
-    struct cmsghdr *cmsg;
     struct in6_pktinfo *ipi;
 
     cmsg = CMSG_FIRSTHDR(&msg);
@@ -669,6 +811,11 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   }
 #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)
@@ -682,18 +829,9 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
     return 0;
   }
 
-  DEBUG_LOG(LOGF_NtpIO, "Sent %d bytes to %s:%d from %s fd %d", packetlen,
+  DEBUG_LOG(LOGF_NtpIO, "Sent %d bytes to %s:%d from %s fd %d", length,
       UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
       UTI_IPToString(&local_addr->ip_addr), local_addr->sock_fd);
 
   return 1;
 }
-
-/* ================================================== */
-/* Send a packet to a given address */
-
-int
-NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length)
-{
-  return send_packet((void *) packet, length, remote_addr, local_addr);
-}

ntp_io.h

@@ -54,6 +54,7 @@ extern void NIO_CloseServerSocket(int sock_fd);
 extern int NIO_IsServerSocket(int sock_fd);
 
 /* Function to transmit a packet */
-extern int NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
+extern int NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
+                          NTP_Local_Address *local_addr, int length, int process_tx);
 
 #endif /* GOT_NTP_IO_H */

ntp_io_linux.c

@@ -0,0 +1,646 @@
+/*
+  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.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  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/ptp_clock.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;
+  /* 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;
+  /* 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
+
+/* 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;
+
+/* ================================================== */
+
+static int
+add_interface(const char *name, double tx_comp, double rx_comp)
+{
+  struct ethtool_ts_info ts_info;
+  struct hwtstamp_config ts_config;
+  struct ifreq req;
+  int sock_fd, if_index, phc_index, phc_fd;
+  unsigned int i;
+  struct Interface *iface;
+  char phc_path[64];
+
+  /* Check if the interface was not already added */
+  for (i = 0; i < ARR_GetSize(interfaces); i++) {
+    if (!strcmp(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", name) >= sizeof (req.ifr_name)) {
+    close(sock_fd);
+    return 0;
+  }
+
+  if (ioctl(sock_fd, SIOCGIFINDEX, &req)) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "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(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
+    close(sock_fd);
+    return 0;
+  }
+
+  ts_config.flags = 0;
+  ts_config.tx_type = HWTSTAMP_TX_ON;
+  ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
+  req.ifr_data = (char *)&ts_config;
+
+  if (ioctl(sock_fd, SIOCSHWTSTAMP, &req)) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
+    close(sock_fd);
+    return 0;
+  }
+
+  close(sock_fd);
+  phc_index = ts_info.phc_index;
+
+  if (snprintf(phc_path, sizeof (phc_path), "/dev/ptp%d", phc_index) >= sizeof (phc_path))
+    return 0;
+
+  phc_fd = open(phc_path, O_RDONLY);
+  if (phc_fd < 0) {
+    LOG(LOGS_ERR, LOGF_NtpIOLinux, "Could not open %s : %s", phc_path, strerror(errno));
+    return 0;
+  }
+
+  UTI_FdSetCloexec(phc_fd);
+
+  iface = ARR_GetNewElement(interfaces);
+
+  snprintf(iface->name, sizeof (iface->name), "%s", name);
+  iface->if_index = if_index;
+  iface->phc_fd = phc_fd;
+
+  /* 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->tx_comp = tx_comp;
+  iface->rx_comp = rx_comp;
+
+  iface->clock = HCL_CreateInstance();
+
+  DEBUG_LOG(LOGF_NtpIOLinux, "Enabled HW timestamping on %s", name);
+
+  return 1;
+}
+
+/* ================================================== */
+
+static int
+add_all_interfaces(double tx_comp, double rx_comp)
+{
+  struct ifaddrs *ifaddr, *ifa;
+  int r;
+
+  if (getifaddrs(&ifaddr)) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "getifaddrs() failed : %s", strerror(errno));
+    return 0;
+  }
+
+  for (r = 0, ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
+    if (add_interface(ifa->ifa_name, tx_comp, rx_comp))
+      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;
+
+  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(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
+    close(sock_fd);
+    return;
+  }
+
+  close(sock_fd);
+
+  iface->link_speed = ethtool_cmd_speed(&cmd);
+}
+
+/* ================================================== */
+
+void
+NIO_Linux_Initialise(void)
+{
+  double tx_comp, rx_comp;
+  char *name;
+  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, &name, &tx_comp, &rx_comp); i++) {
+    if (!strcmp("*", name))
+      continue;
+    if (!add_interface(name, tx_comp, rx_comp))
+      LOG_FATAL(LOGF_NtpIO, "Could not enable HW timestamping on %s", name);
+    hwts = 1;
+  }
+
+  for (i = 0; CNF_GetHwTsInterface(i, &name, &tx_comp, &rx_comp); i++) {
+    if (strcmp("*", name))
+      continue;
+    if (add_all_interfaces(tx_comp, rx_comp))
+      hwts = 1;
+    break;
+  }
+
+  if (hwts) {
+    ts_flags = SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_RX_HARDWARE;
+    ts_tx_flags = SOF_TIMESTAMPING_TX_HARDWARE;
+  } else {
+    ts_flags = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE;
+    ts_tx_flags = SOF_TIMESTAMPING_TX_SOFTWARE;
+  }
+
+  /* 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);
+}
+
+/* ================================================== */
+
+void
+NIO_Linux_Finalise(void)
+{
+  struct Interface *iface;
+  unsigned int i;
+
+  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, LOGF_NtpIOLinux, "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, LOGF_NtpIOLinux, "Could not set %s socket option", "SO_TIMESTAMPING");
+    ts_flags = 0;
+    return 0;
+  }
+
+  *events |= SCH_FILE_EXCEPTION;
+  return 1;
+}
+
+/* ================================================== */
+
+static int
+get_phc_sample(int phc_fd, struct timespec *phc_ts, struct timespec *local_ts, double *p_delay)
+{
+  struct ptp_sys_offset sys_off;
+  struct timespec ts1, ts2, ts3, phc_tss[PHC_READINGS], sys_tss[PHC_READINGS];
+  double min_delay = 0.0, delays[PHC_READINGS], phc_sum, local_sum, local_prec;
+  int i, n;
+
+  /* Silence valgrind */
+  memset(&sys_off, 0, sizeof (sys_off));
+
+  sys_off.n_samples = PHC_READINGS;
+
+  if (ioctl(phc_fd, PTP_SYS_OFFSET, &sys_off)) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "PTP_SYS_OFFSET", strerror(errno));
+    return 0;
+  }
+
+  for (i = 0; i < PHC_READINGS; i++) {
+    ts1.tv_sec = sys_off.ts[i * 2].sec;
+    ts1.tv_nsec = sys_off.ts[i * 2].nsec;
+    ts2.tv_sec = sys_off.ts[i * 2 + 1].sec;
+    ts2.tv_nsec = sys_off.ts[i * 2 + 1].nsec;
+    ts3.tv_sec = sys_off.ts[i * 2 + 2].sec;
+    ts3.tv_nsec = sys_off.ts[i * 2 + 2].nsec;
+
+    sys_tss[i] = ts1;
+    phc_tss[i] = ts2;
+    delays[i] = UTI_DiffTimespecsToDouble(&ts3, &ts1);
+
+    if (delays[i] <= 0.0)
+      /* Step in the middle of a PHC reading? */
+      return 0;
+
+    if (!i || delays[i] < min_delay)
+      min_delay = delays[i];
+  }
+
+  local_prec = LCL_GetSysPrecisionAsQuantum();
+
+  /* Combine best readings */
+  for (i = n = 0, phc_sum = local_sum = 0.0; i < PHC_READINGS; i++) {
+    if (delays[i] > min_delay + local_prec)
+      continue;
+
+    phc_sum += UTI_DiffTimespecsToDouble(&phc_tss[i], &phc_tss[0]);
+    local_sum += UTI_DiffTimespecsToDouble(&sys_tss[i], &sys_tss[0]) + delays[i] / 2.0;
+    n++;
+  }
+
+  assert(n);
+
+  UTI_AddDoubleToTimespec(&phc_tss[0], phc_sum / n, phc_ts);
+  UTI_AddDoubleToTimespec(&sys_tss[0], local_sum / n, &ts1);
+  LCL_CookTime(&ts1, local_ts, NULL);
+  *p_delay = min_delay;
+
+  return 1;
+}
+
+/* ================================================== */
+
+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)
+{
+  struct timespec sample_phc_ts, sample_local_ts, ts;
+  double sample_delay, rx_correction, ts_delay, err;
+  int l2_length;
+
+  if (HCL_NeedsNewSample(iface->clock, &local_ts->ts)) {
+    if (!get_phc_sample(iface->phc_fd, &sample_phc_ts, &sample_local_ts, &sample_delay))
+      return;
+
+    HCL_AccumulateSample(iface->clock, &sample_phc_ts, &sample_local_ts,
+                         sample_delay / 2.0);
+
+    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.  Without raw sockets we don't know the length of the packet
+     at layer 2, so 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) {
+    l2_length = (family == IPADDR_INET4 ? iface->l2_udp4_ntp_start :
+                 iface->l2_udp6_ntp_start) + rx_ntp_length + 4;
+    rx_correction = l2_length / (1.0e6 / 8 * iface->link_speed);
+
+    UTI_AddDoubleToTimespec(hw_ts, rx_correction, hw_ts);
+  }
+
+  if (!rx_ntp_length && iface->tx_comp)
+    UTI_AddDoubleToTimespec(hw_ts, iface->tx_comp, hw_ts);
+  else if (rx_ntp_length && iface->rx_comp)
+    UTI_AddDoubleToTimespec(hw_ts, -iface->rx_comp, hw_ts);
+
+  if (!HCL_CookTime(iface->clock, hw_ts, &ts, &err))
+    return;
+
+  ts_delay = UTI_DiffTimespecsToDouble(&local_ts->ts, &ts);
+
+  if (fabs(ts_delay) > MAX_TS_DELAY) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "Unacceptable timestamp delay %.9f", ts_delay);
+    return;
+  }
+
+  local_ts->ts = ts;
+  local_ts->err = 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) {
+    /* IPv6 extension headers are not supported */
+    if (msg[6] != 17)
+      return 0;
+
+    memcpy(&addr.in6.sin6_addr.s6_addr, msg + 24, 16);
+    addr.in6.sin6_port = *(uint16_t *)(msg + 40 + 2);
+    addr.in6.sin6_family = AF_INET6;
+    len -= 48, msg += 48;
+#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, int sock_fd, int if_index)
+{
+  struct Interface *iface;
+  struct cmsghdr *cmsg;
+  int is_tx, l2_length;
+
+  is_tx = hdr->msg_flags & MSG_ERRQUEUE;
+  iface = NULL;
+
+  for (cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
+    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[0])) {
+        LCL_CookTime(&ts3.ts[0], &local_ts->ts, &local_ts->err);
+        local_ts->source = NTP_TS_KERNEL;
+      } else if (!UTI_IsZeroTimespec(&ts3.ts[2])) {
+        iface = get_interface(if_index);
+        if (iface) {
+          process_hw_timestamp(iface, &ts3.ts[2], local_ts, !is_tx ? length : 0,
+                               remote_addr->ip_addr.family);
+        } else {
+          DEBUG_LOG(LOGF_NtpIOLinux, "HW clock not found for interface %d", if_index);
+        }
+      }
+    }
+
+    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(LOGF_NtpIOLinux, "Unknown extended error");
+        /* Drop the message */
+        return 1;
+      }
+    }
+  }
+
+  /* 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(LOGF_NtpIOLinux, "Received %d (%d) bytes from error queue for %s:%d fd=%d if=%d tss=%d",
+            l2_length, length, UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
+            sock_fd, 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 HW timestamp is missing or its processing failed */
+  if ((ts_flags & SOF_TIMESTAMPING_RAW_HARDWARE) && local_ts->source != NTP_TS_HARDWARE) {
+    DEBUG_LOG(LOGF_NtpIOLinux, "Missing HW 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;
+
+  /* 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 = (struct cmsghdr *)((char *)CMSG_FIRSTHDR(msg) + 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;
+}

ntp_io_linux.h

@@ -0,0 +1,37 @@
+/*
+  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.
+  */
+
+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_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                                    NTP_Local_Timestamp *local_ts, struct msghdr *hdr, int length,
+                                    int sock_fd, int if_index);
+
+extern int NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd);

ntp_signd.c

@@ -0,0 +1,380 @@
+/*
+  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(LOGF_NtpSignd, "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(LOGF_NtpSignd, "signd socket path too long");
+    close_socket();
+    return 0;
+  }
+
+  if (connect(sock_fd, (struct sockaddr *)&s, sizeof (s)) < 0) {
+    DEBUG_LOG(LOGF_NtpSignd, "Could not connect to signd : %s", strerror(errno));
+    close_socket();
+    return 0;
+  }
+
+  DEBUG_LOG(LOGF_NtpSignd, "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(LOGF_NtpSignd, "Invalid response ID");
+    return;
+  }
+
+  if (ntohl(inst->response.op) != SIGNING_SUCCESS) {
+    DEBUG_LOG(LOGF_NtpSignd, "Signing failed");
+    return;
+  }
+
+  /* Check if the file descriptor is still valid */
+  if (!NIO_IsServerSocket(inst->local_addr.sock_fd)) {
+    DEBUG_LOG(LOGF_NtpSignd, "Invalid NTP socket");
+    return;
+  }
+
+  SCH_GetLastEventTime(NULL, NULL, &ts);
+  delay = UTI_DiffTimespecsToDouble(&ts, &inst->request_ts);
+
+  DEBUG_LOG(LOGF_NtpSignd, "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(LOGF_NtpSignd, "signd socket error: %s", strerror(errno));
+      close_socket();
+      return;
+    }
+
+    DEBUG_LOG(LOGF_NtpSignd, "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_SetFileHandlerEvents(sock_fd, SCH_FILE_INPUT);
+  }
+
+  if (event == SCH_FILE_INPUT) {
+    if (IS_QUEUE_EMPTY()) {
+        DEBUG_LOG(LOGF_NtpSignd, "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(LOGF_NtpSignd, "signd socket error: %s", strerror(errno));
+      else
+        DEBUG_LOG(LOGF_NtpSignd, "signd socket closed");
+
+      close_socket();
+      return;
+    }
+
+    DEBUG_LOG(LOGF_NtpSignd, "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(LOGF_NtpSignd, "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_SetFileHandlerEvents(sock_fd, SCH_FILE_INPUT | SCH_FILE_OUTPUT);
+  }
+}
+
+/* ================================================== */
+
+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, LOGF_NtpSignd, "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(LOGF_NtpSignd, "signd disabled");
+    return 0;
+  }
+
+  if (queue_head == NEXT_QUEUE_INDEX(queue_tail)) {
+    DEBUG_LOG(LOGF_NtpSignd, "signd queue full");
+    return 0;
+  }
+
+  if (length != NTP_NORMAL_PACKET_LENGTH) {
+    DEBUG_LOG(LOGF_NtpSignd, "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_SetFileHandlerEvents(sock_fd, SCH_FILE_INPUT | SCH_FILE_OUTPUT);
+
+  queue_tail = NEXT_QUEUE_INDEX(queue_tail);
+
+  DEBUG_LOG(LOGF_NtpSignd, "Packet added to signd queue (%u:%u)",
+            queue_head, queue_tail);
+
+  return 1;
+}

ntp_signd.h

@@ -0,0 +1,44 @@
+/*
+  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

ntp_sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014
+ * Copyright (C) Miroslav Lichvar  2011-2012, 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
@@ -53,8 +53,7 @@ typedef struct {
   int pool;                     /* Number of the pool from which was this source
                                    added or INVALID_POOL */
   int tentative;                /* Flag indicating there was no valid response
-                                   yet and the source may be removed if other
-                                   sources from the pool respond first */
+                                   received from the source yet */
 } SourceRecord;
 
 /* Hash table of SourceRecord, its size is a power of two and it's never
@@ -71,6 +70,7 @@ static int auto_start_sources = 0;
 struct UnresolvedSource {
   char *name;
   int port;
+  int random_order;
   int replacement;
   union {
     struct {
@@ -117,8 +117,8 @@ static void rehash_records(void);
 static void clean_source_record(SourceRecord *record);
 
 static void
-slew_sources(struct timeval *raw,
-             struct timeval *cooked,
+slew_sources(struct timespec *raw,
+             struct timespec *cooked,
              double dfreq,
              double doffset,
              LCL_ChangeType change_type,
@@ -311,7 +311,7 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type, So
       record->remote_addr = NCR_GetRemoteAddress(record->data);
       record->name = name ? Strdup(name) : NULL;
       record->pool = pool;
-      record->tentative = pool != INVALID_POOL ? 1 : 0;
+      record->tentative = 1;
 
       if (auto_start_sources)
         NCR_StartInstance(record->data);
@@ -328,6 +328,7 @@ replace_source(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr)
 {
   int slot1, slot2, found;
   SourceRecord *record;
+  struct SourcePool *pool;
 
   find_slot(old_addr, &slot1, &found);
   if (!found)
@@ -341,6 +342,15 @@ replace_source(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr)
   NCR_ChangeRemoteAddress(record->data, new_addr);
   record->remote_addr = NCR_GetRemoteAddress(record->data);
 
+  if (!record->tentative) {
+    record->tentative = 1;
+
+    if (record->pool != INVALID_POOL) {
+      pool = ARR_GetElement(pools, record->pool);
+      pool->sources--;
+    }
+  }
+
   /* The hash table must be rebuilt for the new address */
   rehash_records();
 
@@ -358,13 +368,17 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
 {
   NTP_Remote_Address address;
   int i, added;
+  unsigned short first = 0;
+
+  if (us->random_order)
+    UTI_GetRandomBytes(&first, sizeof (first));
 
   for (i = added = 0; i < n_addrs; i++) {
-    DEBUG_LOG(LOGF_NtpSources, "(%d) %s", i + 1, UTI_IPToString(&ip_addrs[i]));
-
-    address.ip_addr = ip_addrs[i];
+    address.ip_addr = ip_addrs[((unsigned int)i + first) % n_addrs];
     address.port = us->port;
 
+    DEBUG_LOG(LOGF_NtpSources, "(%d) %s", i + 1, UTI_IPToString(&address.ip_addr));
+
     if (us->replacement) {
       if (replace_source(&us->replace_source, &address) != NSR_AlreadyInUse)
         break;
@@ -507,6 +521,7 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, Source
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(name);
   us->port = port;
+  us->random_order = 0;
   us->replacement = 0;
   us->new_source.type = type;
   us->new_source.params = *params;
@@ -648,6 +663,11 @@ resolve_source_replacement(SourceRecord *record)
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(record->name);
   us->port = record->remote_addr->port;
+  /* If there never was a valid reply from this source (e.g. it was a bad
+     replacement), ignore the order of addresses from the resolver to not get
+     stuck to a pair of addresses if the order doesn't change, or a group of
+     IPv4/IPv6 addresses if the resolver prefers inaccessible IP family */
+  us->random_order = record->tentative;
   us->replacement = 1;
   us->replace_source = *record->remote_addr;
 
@@ -660,8 +680,8 @@ resolve_source_replacement(SourceRecord *record)
 void
 NSR_HandleBadSource(IPAddr *address)
 {
-  static struct timeval last_replacement;
-  struct timeval now;
+  static struct timespec last_replacement;
+  struct timespec now;
   NTP_Remote_Address remote_addr;
   SourceRecord *record;
   int slot, found;
@@ -682,7 +702,7 @@ NSR_HandleBadSource(IPAddr *address)
 
   /* Don't resolve names too frequently */
   SCH_GetLastEventTime(NULL, NULL, &now);
-  UTI_DiffTimevalsToDouble(&diff, &now, &last_replacement);
+  diff = UTI_DiffTimespecsToDouble(&now, &last_replacement);
   if (fabs(diff) < RESOLVE_INTERVAL_UNIT * (1 << MIN_REPLACEMENT_INTERVAL)) {
     DEBUG_LOG(LOGF_NtpSources, "replacement postponed");
     return;
@@ -733,10 +753,31 @@ static void remove_tentative_pool_sources(int pool)
     rehash_records();
 }
 
+/* ================================================== */
+
+uint32_t
+NSR_GetLocalRefid(IPAddr *address)
+{
+  NTP_Remote_Address remote_addr;
+  int slot, found;
+
+  remote_addr.ip_addr = *address;
+  remote_addr.port = 0;
+
+  find_slot(&remote_addr, &slot, &found);
+  if (!found)
+    return 0;
+
+  return NCR_GetLocalRefid(get_record(slot)->data);
+}
+
+/* ================================================== */
+
 /* This routine is called by ntp_io when a new packet arrives off the network,
    possibly with an authentication tail */
 void
-NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length)
+NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+              NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length)
 {
   SourceRecord *record;
   struct SourcePool *pool;
@@ -748,35 +789,55 @@ NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP
   if (found == 2) { /* Must match IP address AND port number */
     record = get_record(slot);
 
-    if (!NCR_ProcessKnown(message, now, now_err, record->data, local_addr, length))
+    if (!NCR_ProcessRxKnown(record->data, local_addr, rx_ts, message, length))
       return;
 
     if (record->tentative) {
-      /* First reply from a pool source */
+      /* This was the first good reply from the source */
       record->tentative = 0;
 
-      assert(record->pool != INVALID_POOL);
-      pool = (struct SourcePool *)ARR_GetElement(pools, record->pool);
-      pool->sources++;
+      if (record->pool != INVALID_POOL) {
+        pool = ARR_GetElement(pools, record->pool);
+        pool->sources++;
 
-      DEBUG_LOG(LOGF_NtpSources, "pool %s has %d confirmed sources",
-                record->name, pool->sources);
+        DEBUG_LOG(LOGF_NtpSources, "pool %s has %d confirmed sources",
+                  record->name, pool->sources);
 
-      /* If the number of sources reached the configured maximum, remove
-         the tentative sources added from this pool */
-      if (pool->sources >= pool->max_sources)
-        remove_tentative_pool_sources(record->pool);
+        /* If the number of sources from the pool reached the configured
+           maximum, remove the remaining tentative sources */
+        if (pool->sources >= pool->max_sources)
+          remove_tentative_pool_sources(record->pool);
+      }
     }
   } else {
-    NCR_ProcessUnknown(message, now, now_err, remote_addr, local_addr, length);
+    NCR_ProcessRxUnknown(remote_addr, local_addr, rx_ts, message, length);
+  }
+}
+
+/* ================================================== */
+
+void
+NSR_ProcessTx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+              NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length)
+{
+  SourceRecord *record;
+  int slot, found;
+
+  find_slot(remote_addr, &slot, &found);
+
+  if (found == 2) { /* Must match IP address AND port number */
+    record = get_record(slot);
+    NCR_ProcessTxKnown(record->data, local_addr, tx_ts, message, length);
+  } else {
+    NCR_ProcessTxUnknown(remote_addr, local_addr, tx_ts, message, length);
   }
 }
 
 /* ================================================== */
 
 static void
-slew_sources(struct timeval *raw,
-             struct timeval *cooked,
+slew_sources(struct timespec *raw,
+             struct timespec *cooked,
              double dfreq,
              double doffset,
              LCL_ChangeType change_type,
@@ -790,6 +851,7 @@ slew_sources(struct timeval *raw,
     if (record->remote_addr) {
       if (change_type == LCL_ChangeUnknownStep) {
         NCR_ResetInstance(record->data);
+        NCR_ResetPoll(record->data);
       } else {
         NCR_SlewTimes(record->data, cooked, dfreq, doffset);
       }
@@ -1042,7 +1104,7 @@ NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples,
    identify the source record. */
 
 void
-NSR_ReportSource(RPT_SourceReport *report, struct timeval *now)
+NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
 {
   NTP_Remote_Address rem_addr;
   int slot, found;
@@ -1058,6 +1120,26 @@ NSR_ReportSource(RPT_SourceReport *report, struct timeval *now)
   }
 }
 
+/* ================================================== */
+/* The ip address is assumed to be completed on input, that is how we
+   identify the source record. */
+
+int
+NSR_GetNTPReport(RPT_NTPReport *report)
+{
+  NTP_Remote_Address rem_addr;
+  int slot, found;
+
+  rem_addr.ip_addr = report->remote_addr;
+  rem_addr.port = 0;
+  find_slot(&rem_addr, &slot, &found);
+  if (!found)
+    return 0;
+
+  NCR_GetNTPReport(get_record(slot)->data, report);
+  return 1;
+}
+
 /* ================================================== */
 
 void

ntp_sources.h

@@ -83,8 +83,17 @@ 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_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
+extern void NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                          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);
@@ -118,7 +127,9 @@ 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 timeval *now);
+extern void NSR_ReportSource(RPT_SourceReport *report, struct timespec *now);
+
+extern int NSR_GetNTPReport(RPT_NTPReport *report);
 
 extern void NSR_GetActivityReport(RPT_ActivityReport *report);
 

pktlength.c

@@ -67,7 +67,7 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
   REQ_LENGTH_ENTRY(logon, null),                /* LOGON */
   REQ_LENGTH_ENTRY(settime, manual_timestamp),  /* SETTIME */
-  REQ_LENGTH_ENTRY(local, null),                /* LOCAL */
+  { 0, 0 },                                     /* LOCAL */
   REQ_LENGTH_ENTRY(manual, null),               /* MANUAL */
   REQ_LENGTH_ENTRY(null, n_sources),            /* N_SOURCES */
   REQ_LENGTH_ENTRY(source_data, source_data),   /* SOURCE_DATA */
@@ -82,8 +82,8 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDDENYALL */
   REQ_LENGTH_ENTRY(ac_check, null),             /* ACCHECK */
   REQ_LENGTH_ENTRY(ac_check, null),             /* CMDACCHECK */
-  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_SERVER */
-  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_PEER */
+  { 0, 0 },                                     /* ADD_SERVER */
+  { 0, 0 },                                     /* ADD_PEER */
   REQ_LENGTH_ENTRY(del_source, null),           /* DEL_SOURCE */
   REQ_LENGTH_ENTRY(null, null),                 /* WRITERTC */
   REQ_LENGTH_ENTRY(dfreq, null),                /* DFREQ */
@@ -112,6 +112,10 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(null, server_stats),         /* SERVER_STATS */
   REQ_LENGTH_ENTRY(client_accesses_by_index,
                    client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
+  REQ_LENGTH_ENTRY(local, null),                /* LOCAL2 */
+  REQ_LENGTH_ENTRY(ntp_data, ntp_data),         /* NTP_DATA */
+  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_SERVER2 */
+  REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_PEER2 */
 };
 
 static const uint16_t reply_lengths[] = {
@@ -131,6 +135,7 @@ static const uint16_t reply_lengths[] = {
   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 */
 };
 
 /* ================================================== */

refclock.c

@@ -48,7 +48,7 @@ extern RefclockDriver RCL_PHC_driver;
 struct FilterSample {
   double offset;
   double dispersion;
-  struct timeval sample_time;
+  struct timespec sample_time;
 };
 
 struct MedianFilter {
@@ -77,6 +77,7 @@ struct RCL_Instance_Record {
   int leap_status;
   int pps_rate;
   int pps_active;
+  int max_lock_age;
   struct MedianFilter filter;
   uint32_t ref_id;
   uint32_t lock_ref;
@@ -87,40 +88,41 @@ struct RCL_Instance_Record {
   SRC_Instance source;
 };
 
-/* Array of RCL_Instance_Record */
+/* Array of pointers to RCL_Instance_Record */
 static ARR_Instance refclocks;
 
 static LOG_FileID logfileid;
 
-static int valid_sample_time(RCL_Instance instance, struct timeval *tv);
-static int pps_stratum(RCL_Instance instance, struct timeval *tv);
+static int valid_sample_time(RCL_Instance instance, struct timespec *raw, struct timespec *cooked);
+static int pps_stratum(RCL_Instance instance, struct timespec *ts);
 static void poll_timeout(void *arg);
-static void slew_samples(struct timeval *raw, struct timeval *cooked, double dfreq,
+static void slew_samples(struct timespec *raw, struct timespec *cooked, double dfreq,
              double doffset, LCL_ChangeType change_type, void *anything);
 static void add_dispersion(double dispersion, void *anything);
-static void log_sample(RCL_Instance instance, struct timeval *sample_time, int filtered, int pulse, double raw_offset, double cooked_offset, double dispersion);
+static void log_sample(RCL_Instance instance, struct timespec *sample_time, int filtered, int pulse, double raw_offset, double cooked_offset, double dispersion);
 
 static void filter_init(struct MedianFilter *filter, int length, double max_dispersion);
 static void filter_fini(struct MedianFilter *filter);
 static void filter_reset(struct MedianFilter *filter);
 static double filter_get_avg_sample_dispersion(struct MedianFilter *filter);
-static void filter_add_sample(struct MedianFilter *filter, struct timeval *sample_time, double offset, double dispersion);
-static int filter_get_last_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion);
+static void filter_add_sample(struct MedianFilter *filter, struct timespec *sample_time, double offset, double dispersion);
+static int filter_get_last_sample(struct MedianFilter *filter, struct timespec *sample_time, double *offset, double *dispersion);
+static int filter_get_samples(struct MedianFilter *filter);
 static int filter_select_samples(struct MedianFilter *filter);
-static int filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion);
-static void filter_slew_samples(struct MedianFilter *filter, struct timeval *when, double dfreq, double doffset);
+static int filter_get_sample(struct MedianFilter *filter, struct timespec *sample_time, double *offset, double *dispersion);
+static void filter_slew_samples(struct MedianFilter *filter, struct timespec *when, double dfreq, double doffset);
 static void filter_add_dispersion(struct MedianFilter *filter, double dispersion);
 
 static RCL_Instance
 get_refclock(unsigned int index)
 {
-  return (RCL_Instance)ARR_GetElement(refclocks, index);
+  return *(RCL_Instance *)ARR_GetElement(refclocks, index);
 }
 
 void
 RCL_Initialise(void)
 {
-  refclocks = ARR_CreateInstance(sizeof (struct RCL_Instance_Record));
+  refclocks = ARR_CreateInstance(sizeof (RCL_Instance));
 
   CNF_AddRefclocks();
 
@@ -148,6 +150,7 @@ RCL_Finalise(void)
     filter_fini(&inst->filter);
     Free(inst->driver_parameter);
     SRC_DestroyInstance(inst->source);
+    Free(inst);
   }
 
   if (ARR_GetSize(refclocks) > 0) {
@@ -162,8 +165,10 @@ int
 RCL_AddRefclock(RefclockParameters *params)
 {
   int pps_source = 0;
+  RCL_Instance inst;
 
-  RCL_Instance inst = ARR_GetNewElement(refclocks);
+  inst = MallocNew(struct RCL_Instance_Record);
+  *(RCL_Instance *)ARR_GetNewElement(refclocks) = inst;
 
   if (strcmp(params->driver_name, "SHM") == 0) {
     inst->driver = &RCL_SHM_driver;
@@ -198,6 +203,7 @@ RCL_AddRefclock(RefclockParameters *params)
   inst->leap_status = LEAP_Normal;
   inst->pps_rate = params->pps_rate;
   inst->pps_active = 0;
+  inst->max_lock_age = params->max_lock_age;
   inst->lock_ref = params->lock_ref_id;
   inst->offset = params->offset;
   inst->delay = params->delay;
@@ -296,7 +302,7 @@ RCL_StartRefclocks(void)
 }
 
 void
-RCL_ReportSource(RPT_SourceReport *report, struct timeval *now)
+RCL_ReportSource(RPT_SourceReport *report, struct timespec *now)
 {
   unsigned int i;
   uint32_t ref_id;
@@ -358,18 +364,18 @@ RCL_GetDriverOption(RCL_Instance instance, char *name)
 }
 
 int
-RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset, int leap)
+RCL_AddSample(RCL_Instance instance, struct timespec *sample_time, double offset, int leap)
 {
   double correction, dispersion;
-  struct timeval cooked_time;
+  struct timespec cooked_time;
 
   LCL_GetOffsetCorrection(sample_time, &correction, &dispersion);
-  UTI_AddDoubleToTimeval(sample_time, correction, &cooked_time);
+  UTI_AddDoubleToTimespec(sample_time, correction, &cooked_time);
   dispersion += instance->precision;
 
   /* Make sure the timestamp and offset provided by the driver are sane */
   if (!UTI_IsTimeOffsetSane(sample_time, offset) ||
-      !valid_sample_time(instance, sample_time))
+      !valid_sample_time(instance, sample_time, &cooked_time))
     return 0;
 
   switch (leap) {
@@ -396,20 +402,20 @@ RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset,
 }
 
 int
-RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
+RCL_AddPulse(RCL_Instance instance, struct timespec *pulse_time, double second)
 {
   double correction, dispersion, offset;
-  struct timeval cooked_time;
+  struct timespec cooked_time;
   int rate;
   NTP_Leap leap;
 
   leap = LEAP_Normal;
   LCL_GetOffsetCorrection(pulse_time, &correction, &dispersion);
-  UTI_AddDoubleToTimeval(pulse_time, correction, &cooked_time);
+  UTI_AddDoubleToTimespec(pulse_time, correction, &cooked_time);
   dispersion += instance->precision;
 
   if (!UTI_IsTimeOffsetSane(pulse_time, 0.0) ||
-      !valid_sample_time(instance, pulse_time))
+      !valid_sample_time(instance, pulse_time, &cooked_time))
     return 0;
 
   rate = instance->pps_rate;
@@ -426,7 +432,7 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
 
   if (instance->lock_ref != -1) {
     RCL_Instance lock_refclock;
-    struct timeval ref_sample_time;
+    struct timespec ref_sample_time;
     double sample_diff, ref_offset, ref_dispersion, shift;
 
     lock_refclock = get_refclock(instance->lock_ref);
@@ -439,8 +445,8 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
 
     ref_dispersion += filter_get_avg_sample_dispersion(&lock_refclock->filter);
 
-    UTI_DiffTimevalsToDouble(&sample_diff, &cooked_time, &ref_sample_time);
-    if (fabs(sample_diff) >= 2.0 / rate) {
+    sample_diff = UTI_DiffTimespecsToDouble(&cooked_time, &ref_sample_time);
+    if (fabs(sample_diff) >= (double)instance->max_lock_age / rate) {
       DEBUG_LOG(LOGF_Refclock, "refclock pulse ignored samplediff=%.9f",
           sample_diff);
       return 0;
@@ -465,20 +471,21 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
     DEBUG_LOG(LOGF_Refclock, "refclock pulse second=%.9f offset=%.9f offdiff=%.9f samplediff=%.9f",
         second, offset, ref_offset - offset, sample_diff);
   } else {
-    struct timeval ref_time;
+    struct timespec ref_time;
     int is_synchronised, stratum;
     double root_delay, root_dispersion, distance;
     uint32_t ref_id;
 
-    /* Ignore the pulse if we are not well synchronized */
+    /* Ignore the pulse if we are not well synchronized and the local
+       reference is not active */
 
     REF_GetReferenceParams(&cooked_time, &is_synchronised, &leap, &stratum,
         &ref_id, &ref_time, &root_delay, &root_dispersion);
     distance = fabs(root_delay) / 2 + root_dispersion;
 
-    if (!is_synchronised || distance >= 0.5 / rate) {
+    if (leap == LEAP_Unsynchronised || distance >= 0.5 / rate) {
       DEBUG_LOG(LOGF_Refclock, "refclock pulse ignored second=%.9f sync=%d dist=%.9f",
-          second, is_synchronised, distance);
+          second, leap != LEAP_Unsynchronised, distance);
       /* Drop also all stored samples */
       filter_reset(&instance->filter);
       return 0;
@@ -499,25 +506,32 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
 }
 
 static int
-valid_sample_time(RCL_Instance instance, struct timeval *tv)
+valid_sample_time(RCL_Instance instance, struct timespec *raw, struct timespec *cooked)
 {
-  struct timeval raw_time;
-  double diff;
+  struct timespec now_raw, last_sample_time;
+  double diff, last_offset, last_dispersion;
 
-  LCL_ReadRawTime(&raw_time);
-  UTI_DiffTimevalsToDouble(&diff, &raw_time, tv);
-  if (diff < 0.0 || diff > UTI_Log2ToDouble(instance->poll + 1)) {
-    DEBUG_LOG(LOGF_Refclock, "%s refclock sample not valid age=%.6f tv=%s",
-        UTI_RefidToString(instance->ref_id), diff, UTI_TimevalToString(tv));
+  LCL_ReadRawTime(&now_raw);
+  diff = UTI_DiffTimespecsToDouble(&now_raw, raw);
+
+  if (diff < 0.0 || diff > UTI_Log2ToDouble(instance->poll + 1) ||
+      (filter_get_samples(&instance->filter) > 0 &&
+       filter_get_last_sample(&instance->filter, &last_sample_time,
+                              &last_offset, &last_dispersion) &&
+       UTI_CompareTimespecs(&last_sample_time, cooked) >= 0)) {
+    DEBUG_LOG(LOGF_Refclock, "%s refclock sample not valid age=%.6f raw=%s cooked=%s",
+              UTI_RefidToString(instance->ref_id), diff,
+              UTI_TimespecToString(raw), UTI_TimespecToString(cooked));
     return 0;
   }
+
   return 1;
 }
 
 static int
-pps_stratum(RCL_Instance instance, struct timeval *tv)
+pps_stratum(RCL_Instance instance, struct timespec *ts)
 {
-  struct timeval ref_time;
+  struct timespec ref_time;
   int is_synchronised, stratum;
   unsigned int i;
   double root_delay, root_dispersion;
@@ -525,12 +539,13 @@ pps_stratum(RCL_Instance instance, struct timeval *tv)
   uint32_t ref_id;
   RCL_Instance refclock;
 
-  REF_GetReferenceParams(tv, &is_synchronised, &leap, &stratum,
+  REF_GetReferenceParams(ts, &is_synchronised, &leap, &stratum,
       &ref_id, &ref_time, &root_delay, &root_dispersion);
 
-  /* Don't change our stratum if local stratum is active
+  /* Don't change our stratum if the local reference is active
      or this is the current source */
-  if (ref_id == instance->ref_id || REF_IsLocalActive())
+  if (ref_id == instance->ref_id ||
+      (!is_synchronised && leap != LEAP_Unsynchronised))
     return stratum - 1;
 
   /* Or the current source is another PPS refclock */ 
@@ -561,7 +576,7 @@ poll_timeout(void *arg)
   
   if (!(inst->driver->poll && inst->driver_polled < (1 << (inst->poll - inst->driver_poll)))) {
     double offset, dispersion;
-    struct timeval sample_time;
+    struct timespec sample_time;
     int sample_ok, stratum;
 
     sample_ok = filter_get_sample(&inst->filter, &sample_time, &offset, &dispersion);
@@ -589,7 +604,7 @@ poll_timeout(void *arg)
 }
 
 static void
-slew_samples(struct timeval *raw, struct timeval *cooked, double dfreq,
+slew_samples(struct timespec *raw, struct timespec *cooked, double dfreq,
              double doffset, LCL_ChangeType change_type, void *anything)
 {
   unsigned int i;
@@ -612,7 +627,7 @@ add_dispersion(double dispersion, void *anything)
 }
 
 static void
-log_sample(RCL_Instance instance, struct timeval *sample_time, int filtered, int pulse, double raw_offset, double cooked_offset, double dispersion)
+log_sample(RCL_Instance instance, struct timespec *sample_time, int filtered, int pulse, double raw_offset, double cooked_offset, double dispersion)
 {
   char sync_stats[4] = {'N', '+', '-', '?'};
 
@@ -622,7 +637,7 @@ log_sample(RCL_Instance instance, struct timeval *sample_time, int filtered, int
   if (!filtered) {
     LOG_FileWrite(logfileid, "%s.%06d %-5s %3d %1c %1d %13.6e %13.6e %10.3e",
       UTI_TimeToLogForm(sample_time->tv_sec),
-      (int)sample_time->tv_usec,
+      (int)sample_time->tv_nsec / 1000,
       UTI_RefidToString(instance->ref_id),
       instance->driver_polled,
       sync_stats[instance->leap_status],
@@ -633,7 +648,7 @@ log_sample(RCL_Instance instance, struct timeval *sample_time, int filtered, int
   } else {
     LOG_FileWrite(logfileid, "%s.%06d %-5s   - %1c -       -       %13.6e %10.3e",
       UTI_TimeToLogForm(sample_time->tv_sec),
-      (int)sample_time->tv_usec,
+      (int)sample_time->tv_nsec / 1000,
       UTI_RefidToString(instance->ref_id),
       sync_stats[instance->leap_status],
       cooked_offset,
@@ -686,7 +701,7 @@ filter_get_avg_sample_dispersion(struct MedianFilter *filter)
 }
 
 static void
-filter_add_sample(struct MedianFilter *filter, struct timeval *sample_time, double offset, double dispersion)
+filter_add_sample(struct MedianFilter *filter, struct timespec *sample_time, double offset, double dispersion)
 {
   filter->index++;
   filter->index %= filter->length;
@@ -699,11 +714,11 @@ filter_add_sample(struct MedianFilter *filter, struct timeval *sample_time, doub
   filter->samples[filter->index].dispersion = dispersion;
 
   DEBUG_LOG(LOGF_Refclock, "filter sample %d t=%s offset=%.9f dispersion=%.9f",
-      filter->index, UTI_TimevalToString(sample_time), offset, dispersion);
+      filter->index, UTI_TimespecToString(sample_time), offset, dispersion);
 }
 
 static int
-filter_get_last_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion)
+filter_get_last_sample(struct MedianFilter *filter, struct timespec *sample_time, double *offset, double *dispersion)
 {
   if (filter->last < 0)
     return 0;
@@ -714,6 +729,12 @@ filter_get_last_sample(struct MedianFilter *filter, struct timeval *sample_time,
   return 1;
 }
 
+static int
+filter_get_samples(struct MedianFilter *filter)
+{
+  return filter->used;
+}
+
 static const struct FilterSample *tmp_sorted_array;
 
 static int
@@ -816,7 +837,7 @@ filter_select_samples(struct MedianFilter *filter)
 }
 
 static int
-filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion)
+filter_get_sample(struct MedianFilter *filter, struct timespec *sample_time, double *offset, double *dispersion)
 {
   struct FilterSample *s, *ls;
   int i, n, dof;
@@ -833,7 +854,7 @@ filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, doub
   for (i = 0; i < n; i++) {
     s = &filter->samples[filter->selected[i]];
 
-    UTI_DiffTimevalsToDouble(&filter->x_data[i], &s->sample_time, &ls->sample_time);
+    filter->x_data[i] = UTI_DiffTimespecsToDouble(&s->sample_time, &ls->sample_time);
     filter->y_data[i] = s->offset;
     filter->w_data[i] = s->dispersion;
   }
@@ -908,7 +929,7 @@ filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, doub
   if (d < e)
     d = e;
 
-  UTI_AddDoubleToTimeval(&ls->sample_time, x, sample_time);
+  UTI_AddDoubleToTimespec(&ls->sample_time, x, sample_time);
   *offset = y;
   *dispersion = d;
 
@@ -918,15 +939,26 @@ filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, doub
 }
 
 static void
-filter_slew_samples(struct MedianFilter *filter, struct timeval *when, double dfreq, double doffset)
+filter_slew_samples(struct MedianFilter *filter, struct timespec *when, double dfreq, double doffset)
 {
-  int i;
+  int i, first, last;
   double delta_time;
-  struct timeval *sample;
+  struct timespec *sample;
 
-  for (i = 0; i < filter->used; i++) {
+  if (filter->last < 0)
+    return;
+
+  /* always slew the last sample as it may be needed by PPS refclocks */
+  if (filter->used > 0) {
+    first = 0;
+    last = filter->used - 1;
+  } else {
+    first = last = filter->last;
+  }
+
+  for (i = first; i <= last; i++) {
     sample = &filter->samples[i].sample_time;
-    UTI_AdjustTimeval(sample, when, sample, &delta_time, dfreq, doffset);
+    UTI_AdjustTimespec(sample, when, sample, &delta_time, dfreq, doffset);
     filter->samples[i].offset -= delta_time;
   }
 }

refclock.h

@@ -41,6 +41,7 @@ typedef struct {
   int min_samples;
   int max_samples;
   int sel_options;
+  int max_lock_age;
   uint32_t ref_id;
   uint32_t lock_ref_id;
   double offset;
@@ -61,14 +62,14 @@ 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 timeval *now);
+extern void RCL_ReportSource(RPT_SourceReport *report, struct timespec *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 char *RCL_GetDriverOption(RCL_Instance instance, char *name);
-extern int RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset, int leap);
-extern int RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second);
+extern int RCL_AddSample(RCL_Instance instance, struct timespec *sample_time, double offset, int leap);
+extern int RCL_AddPulse(RCL_Instance instance, struct timespec *pulse_time, double second);
 
 #endif

refclock_phc.c

@@ -56,11 +56,6 @@ struct phc_reading {
   struct timespec sys_ts2;
 };
 
-static double diff_ts(struct timespec *ts1, struct timespec *ts2)
-{
-  return (ts1->tv_sec - ts2->tv_sec) + (ts1->tv_nsec - ts2->tv_nsec) / 1e9;
-}
-
 static int read_phc_ioctl(struct phc_reading *readings, int phc_fd, int n)
 {
 #if defined(PTP_SYS_OFFSET) && NUM_READINGS <= PTP_MAX_SAMPLES
@@ -145,7 +140,6 @@ static void phc_finalise(RCL_Instance instance)
 static int phc_poll(RCL_Instance instance)
 {
   struct phc_reading readings[NUM_READINGS];
-  struct timeval tv;
   double offset = 0.0, delay, best_delay = 0.0;
   int i, phc_fd, best;
  
@@ -163,7 +157,7 @@ static int phc_poll(RCL_Instance instance)
 
   /* Find the fastest reading */
   for (i = 0; i < NUM_READINGS; i++) {
-    delay = diff_ts(&readings[i].sys_ts2, &readings[i].sys_ts1);
+    delay = UTI_DiffTimespecsToDouble(&readings[i].sys_ts2, &readings[i].sys_ts1);
 
     if (!i || best_delay > delay) {
       best = i;
@@ -171,13 +165,12 @@ static int phc_poll(RCL_Instance instance)
     }
   }
 
-  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;
+  offset = UTI_DiffTimespecsToDouble(&readings[best].phc_ts, &readings[best].sys_ts2) +
+           best_delay / 2.0;
 
   DEBUG_LOG(LOGF_Refclock, "PHC offset: %+.9f delay: %.9f", offset, best_delay);
 
-  return RCL_AddSample(instance, &tv, offset, LEAP_Normal);
+  return RCL_AddSample(instance, &readings[best].sys_ts2, offset, LEAP_Normal);
 }
 
 RefclockDriver RCL_PHC_driver = {

refclock_pps.c

@@ -124,7 +124,6 @@ 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;
 
@@ -146,17 +145,15 @@ static int pps_poll(RCL_Instance instance)
     ts = pps_info.clear_timestamp;
   }
 
-  if (seq == pps->last_seq || (ts.tv_sec == 0 && ts.tv_nsec == 0)) { 
-    DEBUG_LOG(LOGF_Refclock, "PPS sample ignored seq=%lu ts=%lu.%09lu",
-        seq, ts.tv_sec, ts.tv_nsec);
+  if (seq == pps->last_seq || UTI_IsZeroTimespec(&ts)) {
+    DEBUG_LOG(LOGF_Refclock, "PPS sample ignored seq=%lu ts=%s",
+              seq, UTI_TimespecToString(&ts));
     return 0;
   }
 
   pps->last_seq = seq;
-  tv.tv_sec = ts.tv_sec;
-  tv.tv_usec = ts.tv_nsec / 1000;
 
-  return RCL_AddPulse(instance, &tv, ts.tv_nsec / 1e9);
+  return RCL_AddPulse(instance, &ts, 1.0e-9 * ts.tv_nsec);
 }
 
 RefclockDriver RCL_PPS_driver = {

refclock_shm.c

@@ -90,7 +90,7 @@ static void shm_finalise(RCL_Instance instance)
 
 static int shm_poll(RCL_Instance instance)
 {
-  struct timeval tv;
+  struct timespec receive_ts, clock_ts;
   struct shmTime t, *shm;
   double offset;
 
@@ -107,17 +107,23 @@ static int shm_poll(RCL_Instance instance)
 
   shm->valid = 0;
 
-  tv.tv_sec = t.receiveTimeStampSec;
-  tv.tv_usec = t.receiveTimeStampUSec;
+  receive_ts.tv_sec = t.receiveTimeStampSec;
+  clock_ts.tv_sec = t.clockTimeStampSec;
 
-  offset = t.clockTimeStampSec - t.receiveTimeStampSec;
   if (t.clockTimeStampNSec / 1000 == t.clockTimeStampUSec &&
-      t.receiveTimeStampNSec / 1000 == t.receiveTimeStampUSec)
-    offset += (t.clockTimeStampNSec - t.receiveTimeStampNSec) * 1e-9;
-  else
-    offset += (t.clockTimeStampUSec - t.receiveTimeStampUSec) * 1e-6;
+      t.receiveTimeStampNSec / 1000 == t.receiveTimeStampUSec) {
+    receive_ts.tv_nsec = t.receiveTimeStampNSec;
+    clock_ts.tv_nsec = t.clockTimeStampNSec;
+  } else {
+    receive_ts.tv_nsec = 1000 * t.receiveTimeStampUSec;
+    clock_ts.tv_nsec = 1000 * t.clockTimeStampUSec;
+  }
 
-  return RCL_AddSample(instance, &tv, offset, t.leap);
+  UTI_NormaliseTimespec(&clock_ts);
+  UTI_NormaliseTimespec(&receive_ts);
+  offset = UTI_DiffTimespecsToDouble(&clock_ts, &receive_ts);
+
+  return RCL_AddSample(instance, &receive_ts, offset, t.leap);
 }
 
 RefclockDriver RCL_SHM_driver = {

refclock_sock.c

@@ -57,14 +57,14 @@ struct sock_sample {
   int magic;
 };
 
-static void read_sample(void *anything)
+static void read_sample(int sockfd, int event, void *anything)
 {
   struct sock_sample sample;
+  struct timespec ts;
   RCL_Instance instance;
-  int sockfd, s;
+  int s;
 
   instance = (RCL_Instance)anything;
-  sockfd = (long)RCL_GetDriverData(instance);
 
   s = recv(sockfd, &sample, sizeof (sample), 0);
 
@@ -86,10 +86,13 @@ static void read_sample(void *anything)
     return;
   }
 
+  UTI_TimevalToTimespec(&sample.tv, &ts);
+  UTI_NormaliseTimespec(&ts);
+
   if (sample.pulse) {
-    RCL_AddPulse(instance, &sample.tv, sample.offset);
+    RCL_AddPulse(instance, &ts, sample.offset);
   } else {
-    RCL_AddSample(instance, &sample.tv, sample.offset, sample.leap);
+    RCL_AddSample(instance, &ts, sample.offset, sample.leap);
   }
 }
 
@@ -122,7 +125,7 @@ static int sock_initialise(RCL_Instance instance)
   }
 
   RCL_SetDriverData(instance, (void *)(long)sockfd);
-  SCH_AddInputFileHandler(sockfd, read_sample, instance);
+  SCH_AddFileHandler(sockfd, SCH_FILE_INPUT, read_sample, instance);
   return 1;
 }
 
@@ -131,7 +134,7 @@ static void sock_finalise(RCL_Instance instance)
   int sockfd;
 
   sockfd = (long)RCL_GetDriverData(instance);
-  SCH_RemoveInputFileHandler(sockfd);
+  SCH_RemoveFileHandler(sockfd);
   close(sockfd);
 }
 

reference.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2015
+ * 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
@@ -45,12 +45,14 @@
 static int are_we_synchronised;
 static int enable_local_stratum;
 static int local_stratum;
+static int local_orphan;
+static double local_distance;
 static NTP_Leap our_leap_status;
 static int our_leap_sec;
 static int our_stratum;
 static uint32_t our_ref_id;
 static IPAddr our_ref_ip;
-struct timeval our_ref_time;
+static struct timespec our_ref_time;
 static double our_skew;
 static double our_residual_freq;
 static double our_root_delay;
@@ -134,7 +136,7 @@ static int next_fb_drift;
 static SCH_TimeoutID fb_drift_timeout_id;
 
 /* Timestamp of last reference update */
-static struct timeval last_ref_update;
+static struct timespec last_ref_update;
 static double last_ref_update_interval;
 
 /* ================================================== */
@@ -145,23 +147,22 @@ static void update_leap_status(NTP_Leap leap, time_t now, int reset);
 /* ================================================== */
 
 static void
-handle_slew(struct timeval *raw,
-            struct timeval *cooked,
+handle_slew(struct timespec *raw,
+            struct timespec *cooked,
             double dfreq,
             double doffset,
             LCL_ChangeType change_type,
             void *anything)
 {
   double delta;
-  struct timeval now;
+  struct timespec now;
 
-  UTI_AdjustTimeval(&our_ref_time, cooked, &our_ref_time, &delta, dfreq, doffset);
+  UTI_AdjustTimespec(&our_ref_time, cooked, &our_ref_time, &delta, dfreq, doffset);
 
   if (change_type == LCL_ChangeUnknownStep) {
-    last_ref_update.tv_sec = 0;
-    last_ref_update.tv_usec = 0;
+    UTI_ZeroTimespec(&last_ref_update);
   } else if (last_ref_update.tv_sec) {
-    UTI_AdjustTimeval(&last_ref_update, cooked, &last_ref_update, &delta, dfreq, doffset);
+    UTI_AdjustTimespec(&last_ref_update, cooked, &last_ref_update, &delta, dfreq, doffset);
   }
 
   /* When the clock was stepped, check if that doesn't change our leap status
@@ -230,7 +231,7 @@ REF_Initialise(void)
 
   correction_time_ratio = CNF_GetCorrectionTimeRatio();
 
-  enable_local_stratum = CNF_AllowLocalReference(&local_stratum);
+  enable_local_stratum = CNF_AllowLocalReference(&local_stratum, &local_orphan, &local_distance);
 
   leap_timeout_id = 0;
   leap_in_progress = 0;
@@ -265,8 +266,7 @@ REF_Initialise(void)
     fb_drift_timeout_id = 0;
   }
 
-  last_ref_update.tv_sec = 0;
-  last_ref_update.tv_usec = 0;
+  UTI_ZeroTimespec(&last_ref_update);
   last_ref_update_interval = 0.0;
 
   LCL_AddParameterChangeHandler(handle_slew, NULL);
@@ -466,16 +466,16 @@ fb_drift_timeout(void *arg)
 /* ================================================== */
 
 static void
-schedule_fb_drift(struct timeval *now)
+schedule_fb_drift(struct timespec *now)
 {
   int i, c, secs;
   double unsynchronised;
-  struct timeval when;
+  struct timespec when;
 
   if (fb_drift_timeout_id)
     return; /* already scheduled */
 
-  UTI_DiffTimevalsToDouble(&unsynchronised, now, &last_ref_update);
+  unsynchronised = UTI_DiffTimespecsToDouble(now, &last_ref_update);
 
   for (c = secs = 0, i = fb_drift_min; i <= fb_drift_max; i++) {
     secs = 1 << i;
@@ -497,7 +497,7 @@ schedule_fb_drift(struct timeval *now)
 
   if (i <= fb_drift_max) {
     next_fb_drift = i;
-    UTI_AddDoubleToTimeval(now, secs - unsynchronised, &when);
+    UTI_AddDoubleToTimespec(now, secs - unsynchronised, &when);
     fb_drift_timeout_id = SCH_AddTimeout(&when, fb_drift_timeout, NULL);
     DEBUG_LOG(LOGF_Reference, "Fallback drift %d scheduled", i);
   }
@@ -725,7 +725,7 @@ leap_start_timeout(void *arg)
 static void
 set_leap_timeout(time_t now)
 {
-  struct timeval when;
+  struct timespec when;
 
   /* Stop old timer if there is one */
   SCH_RemoveTimeout(leap_timeout_id);
@@ -739,12 +739,12 @@ set_leap_timeout(time_t now)
      will be corrected by the system, timeout slightly sooner to be sure it
      will happen before the system correction. */
   when.tv_sec = (now / (24 * 3600) + 1) * (24 * 3600);
-  when.tv_usec = 0;
+  when.tv_nsec = 0;
   if (our_leap_sec < 0)
     when.tv_sec--;
   if (leap_mode == REF_LeapModeSystem) {
     when.tv_sec--;
-    when.tv_usec = 500000;
+    when.tv_nsec = 500000000;
   }
 
   leap_timeout_id = SCH_AddTimeout(&when, leap_start_timeout, NULL);
@@ -802,7 +802,7 @@ update_leap_status(NTP_Leap leap, time_t now, int reset)
 /* ================================================== */
 
 static void
-write_log(struct timeval *ref_time, char *ref, int stratum, NTP_Leap leap,
+write_log(struct timespec *ref_time, char *ref, int stratum, NTP_Leap leap,
     double freq, double skew, double offset, int combined_sources,
     double offset_sd, double uncorrected_offset)
 {
@@ -879,7 +879,7 @@ REF_SetReference(int stratum,
                  int combined_sources,
                  uint32_t ref_id,
                  IPAddr *ref_ip,
-                 struct timeval *ref_time,
+                 struct timespec *ref_time,
                  double offset,
                  double offset_sd,
                  double frequency,
@@ -900,7 +900,8 @@ REF_SetReference(int stratum,
   double elapsed;
   double correction_rate;
   double uncorrected_offset, accumulate_offset, step_offset;
-  struct timeval now, raw_now;
+  struct timespec now, raw_now;
+  NTP_int64 ref_fuzz;
 
   assert(initialised);
 
@@ -934,9 +935,9 @@ REF_SetReference(int stratum,
     
   LCL_ReadRawTime(&raw_now);
   LCL_GetOffsetCorrection(&raw_now, &uncorrected_offset, NULL);
-  UTI_AddDoubleToTimeval(&raw_now, uncorrected_offset, &now);
+  UTI_AddDoubleToTimespec(&raw_now, uncorrected_offset, &now);
 
-  UTI_DiffTimevalsToDouble(&elapsed, &now, ref_time);
+  elapsed = UTI_DiffTimespecsToDouble(&now, ref_time);
   our_offset = offset + elapsed * frequency;
 
   if (!is_offset_ok(our_offset))
@@ -954,7 +955,7 @@ REF_SetReference(int stratum,
   our_root_dispersion = root_dispersion;
 
   if (last_ref_update.tv_sec) {
-    UTI_DiffTimevalsToDouble(&update_interval, &now, &last_ref_update);
+    update_interval = UTI_DiffTimespecsToDouble(&now, &last_ref_update);
     if (update_interval < 0.0)
       update_interval = 0.0;
   } else {
@@ -1041,6 +1042,15 @@ REF_SetReference(int stratum,
 
   LCL_SetSyncStatus(are_we_synchronised, offset_sd, offset_sd + root_delay / 2.0 + root_dispersion);
 
+  /* Add a random error of up to one second to the reference time to make it
+     less useful when disclosed to NTP and cmdmon clients for estimating
+     receive timestamps in the interleaved symmetric NTP mode */
+  UTI_GetNtp64Fuzz(&ref_fuzz, 0);
+  UTI_TimespecToNtp64(&our_ref_time, &ref_fuzz, &ref_fuzz);
+  UTI_Ntp64ToTimespec(&ref_fuzz, &our_ref_time);
+  if (UTI_CompareTimespecs(&our_ref_time, ref_time) >= 0)
+    our_ref_time.tv_sec--;
+
   abs_freq_ppm = LCL_ReadAbsoluteFrequency();
 
   write_log(&now,
@@ -1087,7 +1097,7 @@ REF_SetReference(int stratum,
 void
 REF_SetManualReference
 (
- struct timeval *ref_time,
+ struct timespec *ref_time,
  double offset,
  double frequency,
  double skew
@@ -1106,7 +1116,7 @@ void
 REF_SetUnsynchronised(void)
 {
   /* Variables required for logging to statistics log */
-  struct timeval now, now_raw;
+  struct timespec now, now_raw;
   double uncorrected_offset;
 
   assert(initialised);
@@ -1119,7 +1129,7 @@ REF_SetUnsynchronised(void)
 
   LCL_ReadRawTime(&now_raw);
   LCL_GetOffsetCorrection(&now_raw, &uncorrected_offset, NULL);
-  UTI_AddDoubleToTimeval(&now_raw, uncorrected_offset, &now);
+  UTI_AddDoubleToTimespec(&now_raw, uncorrected_offset, &now);
 
   if (fb_drifts) {
     schedule_fb_drift(&now);
@@ -1147,39 +1157,47 @@ REF_SetUnsynchronised(void)
 void
 REF_GetReferenceParams
 (
- struct timeval *local_time,
+ struct timespec *local_time,
  int *is_synchronised,
  NTP_Leap *leap_status,
  int *stratum,
  uint32_t *ref_id,
- struct timeval *ref_time,
+ struct timespec *ref_time,
  double *root_delay,
  double *root_dispersion
 )
 {
-  double elapsed;
-  double extra_dispersion;
+  double elapsed, dispersion;
 
   assert(initialised);
 
   if (are_we_synchronised) {
+    elapsed = UTI_DiffTimespecsToDouble(local_time, &our_ref_time);
+    dispersion = our_root_dispersion +
+      (our_skew + fabs(our_residual_freq) + LCL_GetMaxClockError()) * elapsed;
+  } else {
+    dispersion = 0.0;
+  }
+
+  /* Local reference is active when enabled and the clock is not synchronised
+     or the root distance exceeds the threshold */
+
+  if (are_we_synchronised &&
+      !(enable_local_stratum && our_root_delay / 2 + dispersion > local_distance)) {
 
     *is_synchronised = 1;
 
     *stratum = our_stratum;
 
-    UTI_DiffTimevalsToDouble(&elapsed, local_time, &our_ref_time);
-    extra_dispersion = (our_skew + fabs(our_residual_freq) + LCL_GetMaxClockError()) * elapsed;
-
     *leap_status = !leap_in_progress ? our_leap_status : LEAP_Unsynchronised;
     *ref_id = our_ref_id;
     *ref_time = our_ref_time;
     *root_delay = our_root_delay;
-    *root_dispersion = our_root_dispersion + extra_dispersion;
+    *root_dispersion = dispersion;
 
   } else if (enable_local_stratum) {
 
-    *is_synchronised = 1;
+    *is_synchronised = 0;
 
     *stratum = local_stratum;
     *ref_id = NTP_REFID_LOCAL;
@@ -1205,7 +1223,7 @@ REF_GetReferenceParams
     *leap_status = LEAP_Unsynchronised;
     *stratum = NTP_MAX_STRATUM;
     *ref_id = NTP_REFID_UNSYNC;
-    ref_time->tv_sec = ref_time->tv_usec = 0;
+    UTI_ZeroTimespec(ref_time);
     /* These values seem to be standard for a client, and
        any peer or client of ours will ignore them anyway because
        we don't claim to be synchronised */
@@ -1220,13 +1238,27 @@ REF_GetReferenceParams
 int
 REF_GetOurStratum(void)
 {
-  if (are_we_synchronised) {
-    return our_stratum;
-  } else if (enable_local_stratum) {
-    return local_stratum;
-  } else {
+  struct timespec now_cooked, ref_time;
+  int synchronised, stratum;
+  NTP_Leap leap_status;
+  uint32_t ref_id;
+  double root_delay, root_dispersion;
+
+  SCH_GetLastEventTime(&now_cooked, NULL, NULL);
+  REF_GetReferenceParams(&now_cooked, &synchronised, &leap_status, &stratum,
+                         &ref_id, &ref_time, &root_delay, &root_dispersion);
+
+  return stratum;
+}
+
+/* ================================================== */
+
+int
+REF_GetOrphanStratum(void)
+{
+  if (!enable_local_stratum || !local_orphan || mode != REF_ModeNormal)
     return NTP_MAX_STRATUM;
-  }
+  return local_stratum;
 }
 
 /* ================================================== */
@@ -1257,10 +1289,12 @@ REF_ModifyMakestep(int limit, double threshold)
 /* ================================================== */
 
 void
-REF_EnableLocal(int stratum)
+REF_EnableLocal(int stratum, double distance, int orphan)
 {
   enable_local_stratum = 1;
-  local_stratum = stratum;
+  local_stratum = CLAMP(1, stratum, NTP_MAX_STRATUM - 1);
+  local_distance = distance;
+  local_orphan = !!orphan;
 }
 
 /* ================================================== */
@@ -1273,19 +1307,11 @@ REF_DisableLocal(void)
 
 /* ================================================== */
 
-int
-REF_IsLocalActive(void)
-{
-  return !are_we_synchronised && enable_local_stratum;
-}
-
-/* ================================================== */
-
 #define LEAP_SECOND_CLOSE 5
 
 int REF_IsLeapSecondClose(void)
 {
-  struct timeval now, now_raw;
+  struct timespec now, now_raw;
   time_t t;
 
   if (!our_leap_sec)
@@ -1309,52 +1335,34 @@ int REF_IsLeapSecondClose(void)
 void
 REF_GetTrackingReport(RPT_TrackingReport *rep)
 {
-  double elapsed;
-  double extra_dispersion;
-  struct timeval now_raw, now_cooked;
+  struct timespec now_raw, now_cooked;
   double correction;
+  int synchronised;
 
   LCL_ReadRawTime(&now_raw);
   LCL_GetOffsetCorrection(&now_raw, &correction, NULL);
-  UTI_AddDoubleToTimeval(&now_raw, correction, &now_cooked);
+  UTI_AddDoubleToTimespec(&now_raw, correction, &now_cooked);
+
+  REF_GetReferenceParams(&now_cooked, &synchronised,
+                         &rep->leap_status, &rep->stratum,
+                         &rep->ref_id, &rep->ref_time,
+                         &rep->root_delay, &rep->root_dispersion);
+
+  if (rep->stratum == NTP_MAX_STRATUM)
+    rep->stratum = 0;
 
-  rep->ref_id = NTP_REFID_UNSYNC;
   rep->ip_addr.family = IPADDR_UNSPEC;
-  rep->stratum = 0;
-  rep->leap_status = our_leap_status;
-  rep->ref_time.tv_sec = 0;
-  rep->ref_time.tv_usec = 0;
   rep->current_correction = correction;
   rep->freq_ppm = LCL_ReadAbsoluteFrequency();
   rep->resid_freq_ppm = 0.0;
   rep->skew_ppm = 0.0;
-  rep->root_delay = 0.0;
-  rep->root_dispersion = 0.0;
   rep->last_update_interval = last_ref_update_interval;
   rep->last_offset = last_offset;
   rep->rms_offset = sqrt(avg2_offset);
 
-  if (are_we_synchronised) {
-    
-    UTI_DiffTimevalsToDouble(&elapsed, &now_cooked, &our_ref_time);
-    extra_dispersion = (our_skew + fabs(our_residual_freq) + LCL_GetMaxClockError()) * elapsed;
-    
-    rep->ref_id = our_ref_id;
+  if (synchronised) {
     rep->ip_addr = our_ref_ip;
-    rep->stratum = our_stratum;
-    rep->ref_time = our_ref_time;
     rep->resid_freq_ppm = 1.0e6 * our_residual_freq;
     rep->skew_ppm = 1.0e6 * our_skew;
-    rep->root_delay = our_root_delay;
-    rep->root_dispersion = our_root_dispersion + extra_dispersion;
-
-  } else if (enable_local_stratum) {
-
-    rep->ref_id = NTP_REFID_LOCAL;
-    rep->ip_addr.family = IPADDR_UNSPEC;
-    rep->stratum = local_stratum;
-    rep->ref_time = now_cooked;
-    rep->root_dispersion = LCL_GetSysPrecisionAsQuantum();
   }
-
 }

reference.h

@@ -99,12 +99,12 @@ extern REF_LeapMode REF_GetLeapMode(void);
 
 extern void REF_GetReferenceParams
 (
- struct timeval *local_time,
+ struct timespec *local_time,
  int *is_synchronised,
  NTP_Leap *leap,
  int *stratum,
  uint32_t *ref_id,
- struct timeval *ref_time,
+ struct timespec *ref_time,
  double *root_delay,
  double *root_dispersion
 );
@@ -140,7 +140,7 @@ extern void REF_SetReference
  int combined_sources,
  uint32_t ref_id,
  IPAddr *ref_ip,
- struct timeval *ref_time,
+ struct timespec *ref_time,
  double offset,
  double offset_sd,
  double frequency,
@@ -151,7 +151,7 @@ extern void REF_SetReference
 
 extern void REF_SetManualReference
 (
- struct timeval *ref_time,
+ struct timespec *ref_time,
  double offset,
  double frequency,
  double skew
@@ -165,6 +165,9 @@ REF_SetUnsynchronised(void);
    synchronised */
 extern int REF_GetOurStratum(void);
 
+/* Return stratum of the local reference if orphan mode is enabled */
+extern int REF_GetOrphanStratum(void);
+
 /* Return the current skew */
 extern double REF_GetSkew(void);
 
@@ -174,9 +177,8 @@ extern void REF_ModifyMaxupdateskew(double new_max_update_skew);
 /* Modify makestep settings */
 extern void REF_ModifyMakestep(int limit, double threshold);
 
-extern void REF_EnableLocal(int stratum);
+extern void REF_EnableLocal(int stratum, double distance, int orphan);
 extern void REF_DisableLocal(void);
-extern int REF_IsLocalActive(void);
 
 /* Check if current raw or cooked time is close to a leap second
    and is better to discard any measurements */

regress.c

@@ -109,7 +109,7 @@ double
 RGR_GetTCoef(int dof)
 {
   /* Assuming now the 99.95% quantile */
-  static double coefs[] =
+  static const float coefs[] =
   { 636.6, 31.6, 12.92, 8.61, 6.869,
     5.959, 5.408, 5.041, 4.781, 4.587,
     4.437, 4.318, 4.221, 4.140, 4.073,
@@ -132,7 +132,7 @@ RGR_GetTCoef(int dof)
 double
 RGR_GetChi2Coef(int dof)
 {
-  static double coefs[] = {
+  static const float coefs[] = {
     2.706, 4.605, 6.251, 7.779, 9.236, 10.645, 12.017, 13.362,
     14.684, 15.987, 17.275, 18.549, 19.812, 21.064, 22.307, 23.542,
     24.769, 25.989, 27.204, 28.412, 29.615, 30.813, 32.007, 33.196,
@@ -150,20 +150,6 @@ RGR_GetChi2Coef(int dof)
   }
 }
 
-/* ================================================== */
-/* Structure used for holding results of each regression */
-
-typedef struct {
-  double variance;
-  double slope_sd;
-  double slope;
-  double offset;
-  double offset_sd;
-  double K2; /* Variance / slope_var */
-  int n; /* Number of points */
-  int dof; /* Number of degrees of freedom */
-} RegressionResult;
-
 /* ================================================== */
 /* Critical value for number of runs of residuals with same sign.
    5% critical region for now. */
@@ -653,3 +639,57 @@ RGR_FindBestRobustRegression
 }
 
 /* ================================================== */
+/* This routine performs linear regression with two independent variables.
+   It returns non-zero status if there were enough data points and there
+   was a solution. */
+
+int
+RGR_MultipleRegress
+(double *x1,                    /* first independent variable */
+ double *x2,                    /* second independent variable */
+ double *y,                     /* measured data */
+
+ int n,                         /* number of data points */
+
+ /* The results */
+ double *b2                     /* estimated second slope */
+                                /* other values are not needed yet */
+)
+{
+  double Sx1, Sx2, Sx1x1, Sx1x2, Sx2x2, Sx1y, Sx2y, Sy;
+  double U, V, V1, V2, V3;
+  int i;
+
+  if (n < 4)
+    return 0;
+
+  Sx1 = Sx2 = Sx1x1 = Sx1x2 = Sx2x2 = Sx1y = Sx2y = Sy = 0.0;
+
+  for (i = 0; i < n; i++) {
+    Sx1 += x1[i];
+    Sx2 += x2[i];
+    Sx1x1 += x1[i] * x1[i];
+    Sx1x2 += x1[i] * x2[i];
+    Sx2x2 += x2[i] * x2[i];
+    Sx1y += x1[i] * y[i];
+    Sx2y += x2[i] * y[i];
+    Sy += y[i];
+  }
+
+  U = n * (Sx1x2 * Sx1y - Sx1x1 * Sx2y) +
+      Sx1 * Sx1 * Sx2y - Sx1 * Sx2 * Sx1y +
+      Sy * (Sx2 * Sx1x1 - Sx1 * Sx1x2);
+
+  V1 = n * (Sx1x2 * Sx1x2 - Sx1x1 * Sx2x2);
+  V2 = Sx1 * Sx1 * Sx2x2 + Sx2 * Sx2 * Sx1x1;
+  V3 = -2.0 * Sx1 * Sx2 * Sx1x2;
+  V = V1 + V2 + V3;
+
+  /* Check if there is a (numerically stable) solution */
+  if (fabs(V) * 1.0e10 <= -V1 + V2 + fabs(V3))
+    return 0;
+
+  *b2 = U / V;
+
+  return 1;
+}

regress.h

@@ -119,4 +119,16 @@ RGR_FindBestRobustRegression
  int *n_runs,
  int *best_start);
 
+int
+RGR_MultipleRegress
+(double *x1,                    /* first independent variable */
+ double *x2,                    /* second independent variable */
+ double *y,                     /* measured data */
+
+ int n,                         /* number of data points */
+
+ /* The results */
+ double *b2                     /* estimated second slope */
+);
+
 #endif /* GOT_REGRESS_H */

reports.h

@@ -29,8 +29,7 @@
 
 #include "sysincl.h"
 #include "addressing.h"
-
-#define REPORT_INVALID_OFFSET 0x80000000
+#include "ntp.h"
 
 typedef struct {
   IPAddr ip_addr;
@@ -50,9 +49,9 @@ typedef struct {
 typedef struct {
   uint32_t ref_id;
   IPAddr ip_addr;
-  unsigned long stratum;
-  unsigned long leap_status;
-  struct timeval ref_time;
+  int stratum;
+  NTP_Leap leap_status;
+  struct timespec ref_time;
   double current_correction;
   double last_offset;
   double rms_offset;
@@ -78,7 +77,7 @@ typedef struct {
 } RPT_SourcestatsReport;
 
 typedef struct {
-  struct timeval ref_time;
+  struct timespec ref_time;
   unsigned short n_samples;
   unsigned short n_runs;
   unsigned long span_seconds;
@@ -108,7 +107,7 @@ typedef struct {
 } RPT_ServerStatsReport;
 
 typedef struct {
-  struct timeval when;
+  struct timespec when;
   double slewed_offset;
   double orig_offset;
   double residual;
@@ -132,4 +131,33 @@ typedef struct {
   double remaining_time;
 } RPT_SmoothingReport;
 
+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;
+  double root_delay;
+  double root_dispersion;
+  uint32_t ref_id;
+  struct timespec ref_time;
+  double offset;
+  double peer_delay;
+  double peer_dispersion;
+  double response_time;
+  double jitter_asymmetry;
+  uint16_t tests;
+  int interleaved;
+  int authenticated;
+  char tx_tss_char;
+  char rx_tss_char;
+  uint32_t total_tx_count;
+  uint32_t total_rx_count;
+  uint32_t total_valid_count;
+} RPT_NTPReport;
+
 #endif /* GOT_REPORTS_H */

rtc.c

@@ -98,7 +98,7 @@ get_driftfile_time(void)
 static void
 apply_driftfile_time(time_t t)
 {
-  struct timeval now;
+  struct timespec now;
 
   LCL_ReadCookedTime(&now, NULL);
 

rtc_linux.c

@@ -50,7 +50,7 @@
 
 static void measurement_timeout(void *any);
 
-static void read_from_device(void *any);
+static void read_from_device(int fd_, int event, void *any);
 
 /* ================================================== */
 
@@ -92,9 +92,8 @@ static double *rtc_trim = NULL;
 static time_t rtc_ref;
 
 
-/* System clock (gettimeofday) samples associated with the above
-   samples. */
-static struct timeval *system_times = NULL;
+/* System clock samples associated with the above samples. */
+static struct timespec *system_times = NULL;
 
 /* Number of samples currently stored. */
 static int n_samples;   
@@ -170,7 +169,7 @@ discard_samples(int new_first)
 
   memmove(rtc_sec, rtc_sec + new_first, n_to_save * sizeof(time_t));
   memmove(rtc_trim, rtc_trim + new_first, n_to_save * sizeof(double));
-  memmove(system_times, system_times + new_first, n_to_save * sizeof(struct timeval));
+  memmove(system_times, system_times + new_first, n_to_save * sizeof(struct timespec));
 
   n_samples = n_to_save;
 }
@@ -180,7 +179,7 @@ discard_samples(int new_first)
 #define NEW_FIRST_WHEN_FULL 4
 
 static void
-accumulate_sample(time_t rtc, struct timeval *sys)
+accumulate_sample(time_t rtc, struct timespec *sys)
 {
 
   if (n_samples == MAX_SAMPLES) {
@@ -225,7 +224,7 @@ run_regression(int new_sample,
     for (i=0; i<n_samples; i++) {
       rtc_rel[i] = rtc_trim[i] + (double)(rtc_sec[i] - rtc_ref);
       offsets[i] = ((double) (rtc_ref - system_times[i].tv_sec) -
-                    (1.0e-6 * (double) system_times[i].tv_usec) +
+                    (1.0e-9 * system_times[i].tv_nsec) +
                     rtc_rel[i]);
 
     }
@@ -262,7 +261,7 @@ run_regression(int new_sample,
 
 static void
 slew_samples
-(struct timeval *raw, struct timeval *cooked,
+(struct timespec *raw, struct timespec *cooked,
  double dfreq,
  double doffset,
  LCL_ChangeType change_type,
@@ -278,7 +277,7 @@ slew_samples
   }
 
   for (i=0; i<n_samples; i++) {
-    UTI_AdjustTimeval(system_times + i, cooked, system_times + i, &delta_time,
+    UTI_AdjustTimespec(system_times + i, cooked, system_times + i, &delta_time,
         dfreq, doffset);
   }
 
@@ -534,7 +533,7 @@ RTC_Linux_Initialise(void)
 {
   rtc_sec = MallocArray(time_t, MAX_SAMPLES);
   rtc_trim = MallocArray(double, MAX_SAMPLES);
-  system_times = MallocArray(struct timeval, MAX_SAMPLES);
+  system_times = MallocArray(struct timespec, MAX_SAMPLES);
 
   /* Setup details depending on configuration options */
   setup_config();
@@ -564,7 +563,7 @@ RTC_Linux_Initialise(void)
   operating_mode = OM_NORMAL;
 
   /* Register file handler */
-  SCH_AddInputFileHandler(fd, read_from_device, NULL);
+  SCH_AddFileHandler(fd, SCH_FILE_INPUT, read_from_device, NULL);
 
   /* Register slew handler */
   LCL_AddParameterChangeHandler(slew_samples, NULL);
@@ -585,7 +584,7 @@ RTC_Linux_Finalise(void)
 
   /* Remove input file handler */
   if (fd >= 0) {
-    SCH_RemoveInputFileHandler(fd);
+    SCH_RemoveFileHandler(fd);
     close(fd);
 
     /* Save the RTC data */
@@ -758,7 +757,7 @@ maybe_autotrim(void)
 /* ================================================== */
 
 static void
-process_reading(time_t rtc_time, struct timeval *system_time)
+process_reading(time_t rtc_time, struct timespec *system_time)
 {
   double rtc_fast;
 
@@ -791,7 +790,7 @@ process_reading(time_t rtc_time, struct timeval *system_time)
 
 
   if (logfileid != -1) {
-    rtc_fast = (double)(rtc_time - system_time->tv_sec) - 1.0e-6 * (double) system_time->tv_usec;
+    rtc_fast = (rtc_time - system_time->tv_sec) - 1.0e-9 * system_time->tv_nsec;
 
     LOG_FileWrite(logfileid, "%s %14.6f %1d  %14.6f  %12.3f  %2d  %2d %4d",
             UTI_TimeToLogForm(system_time->tv_sec),
@@ -805,11 +804,11 @@ process_reading(time_t rtc_time, struct timeval *system_time)
 /* ================================================== */
 
 static void
-read_from_device(void *any)
+read_from_device(int fd_, int event, void *any)
 {
   int status;
   unsigned long data;
-  struct timeval sys_time;
+  struct timespec sys_time;
   struct rtc_time rtc_raw;
   struct tm rtc_tm;
   time_t rtc_t;
@@ -821,7 +820,7 @@ read_from_device(void *any)
     /* This looks like a bad error : the file descriptor was indicating it was
      * ready to read but we couldn't read anything.  Give up. */
     LOG(LOGS_ERR, LOGF_RtcLinux, "Could not read flags %s : %s", CNF_GetRtcDevice(), strerror(errno));
-    SCH_RemoveInputFileHandler(fd);
+    SCH_RemoveFileHandler(fd);
     switch_interrupts(0); /* Likely to raise error too, but just to be sure... */
     close(fd);
     fd = -1;
@@ -849,7 +848,7 @@ read_from_device(void *any)
       goto turn_off_interrupt;
     }
 
-    /* Convert RTC time into a struct timeval */
+    /* Convert RTC time into a struct timespec */
     rtc_tm.tm_sec = rtc_raw.tm_sec;
     rtc_tm.tm_min = rtc_raw.tm_min;
     rtc_tm.tm_hour = rtc_raw.tm_hour;
@@ -978,7 +977,7 @@ RTC_Linux_TimePreInit(time_t driftfile_time)
   struct tm rtc_tm;
   time_t rtc_t;
   double accumulated_error, sys_offset;
-  struct timeval new_sys_time, old_sys_time;
+  struct timespec new_sys_time, old_sys_time;
 
   coefs_file_name = CNF_GetRtcFile();
 
@@ -1032,16 +1031,16 @@ RTC_Linux_TimePreInit(time_t driftfile_time)
 
       new_sys_time.tv_sec = rtc_t;
       /* Average error in the RTC reading */
-      new_sys_time.tv_usec = 500000;
+      new_sys_time.tv_nsec = 500000000;
 
-      UTI_AddDoubleToTimeval(&new_sys_time, -accumulated_error, &new_sys_time);
+      UTI_AddDoubleToTimespec(&new_sys_time, -accumulated_error, &new_sys_time);
 
       if (new_sys_time.tv_sec < driftfile_time) {
         LOG(LOGS_WARN, LOGF_RtcLinux, "RTC time before last driftfile modification (ignored)");
         return 0;
       }
 
-      UTI_DiffTimevalsToDouble(&sys_offset, &old_sys_time, &new_sys_time);
+      sys_offset = UTI_DiffTimespecsToDouble(&old_sys_time, &new_sys_time);
 
       /* Set system time only if the step is larger than 1 second */
       if (fabs(sys_offset) >= 1.0) {
@@ -1064,7 +1063,7 @@ int
 RTC_Linux_GetReport(RPT_RTC_Report *report)
 {
   report->ref_time.tv_sec = coef_ref_time;
-  report->ref_time.tv_usec = 0;
+  report->ref_time.tv_nsec = 0;
   report->n_samples = n_samples;
   report->n_runs = n_runs;
   if (n_samples > 1) {
@@ -1083,8 +1082,7 @@ RTC_Linux_GetReport(RPT_RTC_Report *report)
 int
 RTC_Linux_Trim(void)
 {
-  struct timeval now;
-
+  struct timespec now;
 
   /* Remember the slope coefficient - we won't be able to determine a
      good one in a few seconds when we determine the new offset! */
@@ -1114,7 +1112,7 @@ RTC_Linux_Trim(void)
 
     /* Estimate the offset in case writertc is called or chronyd
        is terminated during rapid sampling */
-    coef_seconds_fast = -now.tv_usec / 1e6 + 0.5;
+    coef_seconds_fast = -now.tv_nsec / 1.0e9 + 0.5;
     coef_ref_time = now.tv_sec;
 
     /* And start rapid sampling, interrupts on now */

sched.c

@@ -44,17 +44,6 @@ static int initialised = 0;
 
 /* ================================================== */
 
-/* Variables to handle the capability to dispatch on particular file
-   handles becoming readable */
-
-/* Each bit set in this fd set corresponds to a read descriptor that
-   we are watching and with which we have a handler associated in the
-   file_handlers array */
-static fd_set read_fds;
-
-/* This is the number of bits that we have set in read_fds */
-static unsigned int n_read_fds;
-
 /* One more than the highest file descriptor that is registered */
 static unsigned int one_highest_fd;
 
@@ -67,12 +56,13 @@ static unsigned int one_highest_fd;
 typedef struct {
   SCH_FileHandler       handler;
   SCH_ArbitraryArgument arg;
+  int                   events;
 } FileHandlerEntry;
 
 static ARR_Instance file_handlers;
 
 /* Timestamp when last select() returned */
-static struct timeval last_select_ts, last_select_ts_raw;
+static struct timespec last_select_ts, last_select_ts_raw;
 static double last_select_ts_err;
 
 /* ================================================== */
@@ -83,7 +73,7 @@ typedef struct _TimerQueueEntry
 {
   struct _TimerQueueEntry *next; /* Forward and back links in the list */
   struct _TimerQueueEntry *prev;
-  struct timeval tv;            /* Local system time at which the
+  struct timespec ts;           /* Local system time at which the
                                    timeout is to expire.  Clearly this
                                    must be in terms of what the
                                    operating system thinks of as
@@ -111,7 +101,7 @@ static SCH_TimeoutID next_tqe_id;
 static TimerQueueEntry *tqe_free_list = NULL;
 
 /* Timestamp when was last timeout dispatched for each class */
-static struct timeval last_class_dispatch[SCH_NumberOfClasses];
+static struct timespec last_class_dispatch[SCH_NumberOfClasses];
 
 /* ================================================== */
 
@@ -120,8 +110,8 @@ static int need_to_exit;
 /* ================================================== */
 
 static void
-handle_slew(struct timeval *raw,
-            struct timeval *cooked,
+handle_slew(struct timespec *raw,
+            struct timespec *cooked,
             double dfreq,
             double doffset,
             LCL_ChangeType change_type,
@@ -132,9 +122,6 @@ handle_slew(struct timeval *raw,
 void
 SCH_Initialise(void)
 {
-  FD_ZERO(&read_fds);
-  n_read_fds = 0;
-
   file_handlers = ARR_CreateInstance(sizeof (FileHandlerEntry));
 
   n_timer_queue_entries = 0;
@@ -166,71 +153,85 @@ SCH_Finalise(void) {
 /* ================================================== */
 
 void
-SCH_AddInputFileHandler
-(int fd, SCH_FileHandler handler, SCH_ArbitraryArgument arg)
+SCH_AddFileHandler
+(int fd, int events, SCH_FileHandler handler, SCH_ArbitraryArgument arg)
 {
   FileHandlerEntry *ptr;
 
   assert(initialised);
+  assert(events);
+  assert(fd >= 0);
   
   if (fd >= FD_SETSIZE)
     LOG_FATAL(LOGF_Scheduler, "Too many file descriptors");
 
+  /* Resize the array if the descriptor is highest so far */
+  while (ARR_GetSize(file_handlers) <= fd) {
+    ptr = ARR_GetNewElement(file_handlers);
+    ptr->handler = NULL;
+    ptr->arg = NULL;
+    ptr->events = 0;
+  }
+
+  ptr = ARR_GetElement(file_handlers, fd);
+
   /* Don't want to allow the same fd to register a handler more than
      once without deleting a previous association - this suggests
      a bug somewhere else in the program. */
-  assert(!FD_ISSET(fd, &read_fds));
+  assert(!ptr->handler);
 
-  ++n_read_fds;
-  
-  if (ARR_GetSize(file_handlers) < fd + 1)
-    ARR_SetSize(file_handlers, fd + 1);
-
-  ptr = (FileHandlerEntry *)ARR_GetElement(file_handlers, fd);
   ptr->handler = handler;
   ptr->arg = arg;
+  ptr->events = events;
 
-  FD_SET(fd, &read_fds);
-
-  if ((fd + 1) > one_highest_fd) {
+  if (one_highest_fd < fd + 1)
     one_highest_fd = fd + 1;
-  }
 }
 
 
 /* ================================================== */
 
 void
-SCH_RemoveInputFileHandler(int fd)
+SCH_RemoveFileHandler(int fd)
 {
-  int fds_left, fd_to_check;
+  FileHandlerEntry *ptr;
 
   assert(initialised);
 
+  ptr = ARR_GetElement(file_handlers, fd);
+
   /* Check that a handler was registered for the fd in question */
-  assert(FD_ISSET(fd, &read_fds));
+  assert(ptr->handler);
 
-  --n_read_fds;
-
-  FD_CLR(fd, &read_fds);
+  ptr->handler = NULL;
+  ptr->arg = NULL;
+  ptr->events = 0;
 
   /* Find new highest file descriptor */
-  fds_left = n_read_fds;
-  fd_to_check = 0;
-  while (fds_left > 0) {
-    if (FD_ISSET(fd_to_check, &read_fds)) {
-      --fds_left;
-    }
-    ++fd_to_check;
+  while (one_highest_fd > 0) {
+    ptr = ARR_GetElement(file_handlers, one_highest_fd - 1);
+    if (ptr->handler)
+      break;
+    one_highest_fd--;
   }
-
-  one_highest_fd = fd_to_check;
 }
 
 /* ================================================== */
 
 void
-SCH_GetLastEventTime(struct timeval *cooked, double *err, struct timeval *raw)
+SCH_SetFileHandlerEvents(int fd, int events)
+{
+  FileHandlerEntry *ptr;
+
+  assert(events);
+  ptr = ARR_GetElement(file_handlers, fd);
+  ptr->events = events;
+}
+
+/* ================================================== */
+
+void
+SCH_GetLastEventTime(struct timespec *cooked, double *err, struct timespec *raw)
 {
   if (cooked) {
     *cooked = last_select_ts;
@@ -297,7 +298,7 @@ try_again:
 /* ================================================== */
 
 SCH_TimeoutID
-SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg)
+SCH_AddTimeout(struct timespec *ts, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg)
 {
   TimerQueueEntry *new_tqe;
   TimerQueueEntry *ptr;
@@ -309,12 +310,12 @@ SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler handler, SCH_ArbitraryArgu
   new_tqe->id = get_new_tqe_id();
   new_tqe->handler = handler;
   new_tqe->arg = arg;
-  new_tqe->tv = *tv;
+  new_tqe->ts = *ts;
   new_tqe->class = SCH_ReservedTimeoutValue;
 
   /* Now work out where to insert the new entry in the list */
   for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next) {
-    if (UTI_CompareTimevals(&new_tqe->tv, &ptr->tv) == -1) {
+    if (UTI_CompareTimespecs(&new_tqe->ts, &ptr->ts) == -1) {
       /* If the new entry comes before the current pointer location in
          the list, we want to insert the new entry just before ptr. */
       break;
@@ -341,14 +342,14 @@ SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler handler, SCH_ArbitraryArgu
 SCH_TimeoutID
 SCH_AddTimeoutByDelay(double delay, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg)
 {
-  struct timeval now, then;
+  struct timespec now, then;
 
   assert(initialised);
   assert(delay >= 0.0);
 
   LCL_ReadRawTime(&now);
-  UTI_AddDoubleToTimeval(&now, delay, &then);
-  if (UTI_CompareTimevals(&now, &then) > 0) {
+  UTI_AddDoubleToTimespec(&now, delay, &then);
+  if (UTI_CompareTimespecs(&now, &then) > 0) {
     LOG_FATAL(LOGF_Scheduler, "Timeout overflow");
   }
 
@@ -365,7 +366,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
 {
   TimerQueueEntry *new_tqe;
   TimerQueueEntry *ptr;
-  struct timeval now;
+  struct timespec now;
   double diff, r;
   double new_min_delay;
 
@@ -374,10 +375,10 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   assert(class < SCH_NumberOfClasses);
 
   if (randomness > 0.0) {
-    uint16_t rnd;
+    uint32_t rnd;
 
     UTI_GetRandomBytes(&rnd, sizeof (rnd));
-    r = rnd / (double)0xffff * randomness + 1.0;
+    r = rnd * (randomness / (uint32_t)-1) + 1.0;
     min_delay *= r;
     separation *= r;
   }
@@ -386,7 +387,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   new_min_delay = min_delay;
 
   /* Check the separation from the last dispatched timeout */
-  UTI_DiffTimevalsToDouble(&diff, &now, &last_class_dispatch[class]);
+  diff = UTI_DiffTimespecsToDouble(&now, &last_class_dispatch[class]);
   if (diff < separation && diff >= 0.0 && diff + new_min_delay < separation) {
     new_min_delay = separation - diff;
   }
@@ -395,7 +396,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
      if necessary to keep at least the separation away */
   for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next) {
     if (ptr->class == class) {
-      UTI_DiffTimevalsToDouble(&diff, &ptr->tv, &now);
+      diff = UTI_DiffTimespecsToDouble(&ptr->ts, &now);
       if (new_min_delay > diff) {
         if (new_min_delay - diff < separation) {
           new_min_delay = diff + separation;
@@ -409,7 +410,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   }
 
   for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next) {
-    UTI_DiffTimevalsToDouble(&diff, &ptr->tv, &now);
+    diff = UTI_DiffTimespecsToDouble(&ptr->ts, &now);
     if (diff > new_min_delay) {
       break;
     }
@@ -421,7 +422,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   new_tqe->id = get_new_tqe_id();
   new_tqe->handler = handler;
   new_tqe->arg = arg;
-  UTI_AddDoubleToTimeval(&now, new_min_delay, &new_tqe->tv);
+  UTI_AddDoubleToTimespec(&now, new_min_delay, &new_tqe->ts);
   new_tqe->class = class;
 
   new_tqe->next = ptr;
@@ -475,7 +476,7 @@ SCH_RemoveTimeout(SCH_TimeoutID id)
    completed). */
 
 static void
-dispatch_timeouts(struct timeval *now) {
+dispatch_timeouts(struct timespec *now) {
   TimerQueueEntry *ptr;
   SCH_TimeoutHandler handler;
   SCH_ArbitraryArgument arg;
@@ -485,7 +486,7 @@ dispatch_timeouts(struct timeval *now) {
     LCL_ReadRawTime(now);
 
     if (!(n_timer_queue_entries > 0 &&
-          UTI_CompareTimevals(now, &(timer_queue.next->tv)) >= 0)) {
+          UTI_CompareTimespecs(now, &timer_queue.next->ts) >= 0)) {
       break;
     }
 
@@ -518,35 +519,49 @@ dispatch_timeouts(struct timeval *now) {
 
 /* ================================================== */
 
-/* nfh is the number of bits set in fhs */
+/* nfd is the number of bits set in all fd_sets */
 
 static void
-dispatch_filehandlers(int nfh, fd_set *fhs)
+dispatch_filehandlers(int nfd, fd_set *read_fds, fd_set *write_fds, fd_set *except_fds)
 {
   FileHandlerEntry *ptr;
-  int fh = 0;
+  int fd;
   
-  while (nfh > 0) {
-    if (FD_ISSET(fh, fhs)) {
+  for (fd = 0; nfd && fd < one_highest_fd; fd++) {
+    if (except_fds && FD_ISSET(fd, except_fds)) {
+      /* This descriptor has an exception, dispatch its handler */
+      ptr = (FileHandlerEntry *)ARR_GetElement(file_handlers, fd);
+      (ptr->handler)(fd, SCH_FILE_EXCEPTION, ptr->arg);
+      nfd--;
 
-      /* This descriptor can be read from, dispatch its handler */
-      ptr = (FileHandlerEntry *)ARR_GetElement(file_handlers, fh);
-      (ptr->handler)(ptr->arg);
-
-      /* Decrement number of readable files still to find */
-      --nfh;
+      /* Don't try to read from it now */
+      if (read_fds && FD_ISSET(fd, read_fds)) {
+        FD_CLR(fd, read_fds);
+        nfd--;
+      }
     }
 
-    ++fh;
-  }
+    if (read_fds && FD_ISSET(fd, read_fds)) {
+      /* This descriptor can be read from, dispatch its handler */
+      ptr = (FileHandlerEntry *)ARR_GetElement(file_handlers, fd);
+      (ptr->handler)(fd, SCH_FILE_INPUT, ptr->arg);
+      nfd--;
+    }
 
+    if (write_fds && FD_ISSET(fd, write_fds)) {
+      /* This descriptor can be written to, dispatch its handler */
+      ptr = (FileHandlerEntry *)ARR_GetElement(file_handlers, fd);
+      (ptr->handler)(fd, SCH_FILE_OUTPUT, ptr->arg);
+      nfd--;
+    }
+  }
 }
 
 /* ================================================== */
 
 static void
-handle_slew(struct timeval *raw,
-            struct timeval *cooked,
+handle_slew(struct timespec *raw,
+            struct timespec *cooked,
             double dfreq,
             double doffset,
             LCL_ChangeType change_type,
@@ -564,17 +579,69 @@ handle_slew(struct timeval *raw,
     /* If a step change occurs, just shift all raw time stamps by the offset */
     
     for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next) {
-      UTI_AddDoubleToTimeval(&ptr->tv, -doffset, &ptr->tv);
+      UTI_AddDoubleToTimespec(&ptr->ts, -doffset, &ptr->ts);
     }
 
     for (i = 0; i < SCH_NumberOfClasses; i++) {
-      UTI_AddDoubleToTimeval(&last_class_dispatch[i], -doffset, &last_class_dispatch[i]);
+      UTI_AddDoubleToTimespec(&last_class_dispatch[i], -doffset, &last_class_dispatch[i]);
     }
 
-    UTI_AddDoubleToTimeval(&last_select_ts_raw, -doffset, &last_select_ts_raw);
+    UTI_AddDoubleToTimespec(&last_select_ts_raw, -doffset, &last_select_ts_raw);
   }
 
-  UTI_AdjustTimeval(&last_select_ts, cooked, &last_select_ts, &delta, dfreq, doffset);
+  UTI_AdjustTimespec(&last_select_ts, cooked, &last_select_ts, &delta, dfreq, doffset);
+}
+
+/* ================================================== */
+
+static void
+fill_fd_sets(fd_set **read_fds, fd_set **write_fds, fd_set **except_fds)
+{
+  FileHandlerEntry *handlers;
+  fd_set *rd, *wr, *ex;
+  int i, n, events;
+
+  n = ARR_GetSize(file_handlers);
+  handlers = ARR_GetElements(file_handlers);
+  rd = wr = ex = NULL;
+
+  for (i = 0; i < n; i++) {
+    events = handlers[i].events;
+
+    if (!events)
+      continue;
+
+    if (events & SCH_FILE_INPUT) {
+      if (!rd) {
+        rd = *read_fds;
+        FD_ZERO(rd);
+      }
+      FD_SET(i, rd);
+    }
+
+    if (events & SCH_FILE_OUTPUT) {
+      if (!wr) {
+        wr = *write_fds;
+        FD_ZERO(wr);
+      }
+      FD_SET(i, wr);
+    }
+
+    if (events & SCH_FILE_EXCEPTION) {
+      if (!ex) {
+        ex = *except_fds;
+        FD_ZERO(ex);
+      }
+      FD_SET(i, ex);
+    }
+  }
+
+  if (!rd)
+    *read_fds = NULL;
+  if (!wr)
+    *write_fds = NULL;
+  if (!ex)
+    *except_fds = NULL;
 }
 
 /* ================================================== */
@@ -582,31 +649,33 @@ handle_slew(struct timeval *raw,
 #define JUMP_DETECT_THRESHOLD 10
 
 static int
-check_current_time(struct timeval *prev_raw, struct timeval *raw, int timeout,
+check_current_time(struct timespec *prev_raw, struct timespec *raw, int timeout,
                    struct timeval *orig_select_tv,
                    struct timeval *rem_select_tv)
 {
-  struct timeval elapsed_min, elapsed_max;
+  struct timespec elapsed_min, elapsed_max, orig_select_ts, rem_select_ts;
   double step, elapsed;
 
+  UTI_TimevalToTimespec(orig_select_tv, &orig_select_ts);
+
   /* Get an estimate of the time spent waiting in the select() call. On some
      systems (e.g. Linux) the timeout timeval is modified to return the
      remaining time, use that information. */
   if (timeout) {
-    elapsed_max = elapsed_min = *orig_select_tv;
+    elapsed_max = elapsed_min = orig_select_ts;
   } else if (rem_select_tv && rem_select_tv->tv_sec >= 0 &&
              rem_select_tv->tv_sec <= orig_select_tv->tv_sec &&
              (rem_select_tv->tv_sec != orig_select_tv->tv_sec ||
               rem_select_tv->tv_usec != orig_select_tv->tv_usec)) {
-    UTI_DiffTimevals(&elapsed_min, orig_select_tv, rem_select_tv);
+    UTI_TimevalToTimespec(rem_select_tv, &rem_select_ts);
+    UTI_DiffTimespecs(&elapsed_min, &orig_select_ts, &rem_select_ts);
     elapsed_max = elapsed_min;
   } else {
     if (rem_select_tv)
-      elapsed_max = *orig_select_tv;
+      elapsed_max = orig_select_ts;
     else
-      UTI_DiffTimevals(&elapsed_max, raw, prev_raw);
-    elapsed_min.tv_sec = 0;
-    elapsed_min.tv_usec = 0;
+      UTI_DiffTimespecs(&elapsed_max, raw, prev_raw);
+    UTI_ZeroTimespec(&elapsed_min);
   }
 
   if (last_select_ts_raw.tv_sec + elapsed_min.tv_sec >
@@ -619,8 +688,8 @@ check_current_time(struct timeval *prev_raw, struct timeval *raw, int timeout,
     return 1;
   }
 
-  UTI_DiffTimevalsToDouble(&step, &last_select_ts_raw, raw);
-  UTI_TimevalToDouble(&elapsed_min, &elapsed);
+  step = UTI_DiffTimespecsToDouble(&last_select_ts_raw, raw);
+  elapsed = UTI_TimespecToDouble(&elapsed_min);
   step += elapsed;
 
   /* Cooked time may no longer be valid after dispatching the handlers */
@@ -634,10 +703,11 @@ check_current_time(struct timeval *prev_raw, struct timeval *raw, int timeout,
 void
 SCH_MainLoop(void)
 {
-  fd_set rd;
+  fd_set read_fds, write_fds, except_fds;
+  fd_set *p_read_fds, *p_write_fds, *p_except_fds;
   int status, errsv;
   struct timeval tv, saved_tv, *ptv;
-  struct timeval now, saved_now, cooked;
+  struct timespec ts, now, saved_now, cooked;
   double err;
 
   assert(initialised);
@@ -653,28 +723,28 @@ SCH_MainLoop(void)
 
     /* Check whether there is a timeout and set it up */
     if (n_timer_queue_entries > 0) {
+      UTI_DiffTimespecs(&ts, &timer_queue.next->ts, &now);
+      assert(ts.tv_sec > 0 || ts.tv_nsec > 0);
 
-      UTI_DiffTimevals(&tv, &(timer_queue.next->tv), &now);
+      UTI_TimespecToTimeval(&ts, &tv);
       ptv = &tv;
-      assert(tv.tv_sec > 0 || tv.tv_usec > 0);
       saved_tv = tv;
-
     } else {
       ptv = NULL;
-      /* This is needed to fix a compiler warning */
-      saved_tv.tv_sec = 0;
+      saved_tv.tv_sec = saved_tv.tv_usec = 0;
     }
 
+    p_read_fds = &read_fds;
+    p_write_fds = &write_fds;
+    p_except_fds = &except_fds;
+    fill_fd_sets(&p_read_fds, &p_write_fds, &p_except_fds);
+
     /* if there are no file descriptors being waited on and no
        timeout set, this is clearly ridiculous, so stop the run */
-    if (!ptv && !n_read_fds) {
+    if (!ptv && !p_read_fds && !p_write_fds)
       LOG_FATAL(LOGF_Scheduler, "Nothing to do");
-    }
 
-    /* Copy current set of read file descriptors */
-    memcpy((void *) &rd, (void *) &read_fds, sizeof(fd_set));
-
-    status = select(one_highest_fd, &rd, NULL, NULL, ptv);
+    status = select(one_highest_fd, p_read_fds, p_write_fds, p_except_fds, ptv);
     errsv = errno;
 
     LCL_ReadRawTime(&now);
@@ -695,10 +765,8 @@ SCH_MainLoop(void)
         LOG_FATAL(LOGF_Scheduler, "select() failed : %s", strerror(errsv));
       }
     } else if (status > 0) {
-      /* A file descriptor is ready to read */
-
-      dispatch_filehandlers(status, &rd);
-
+      /* A file descriptor is ready for input or output */
+      dispatch_filehandlers(status, p_read_fds, p_write_fds, p_except_fds);
     } else {
       /* No descriptors readable, timeout must have elapsed.
        Therefore, tv must be non-null */
@@ -717,7 +785,6 @@ SCH_MainLoop(void)
 void
 SCH_QuitProgram(void)
 {
-  assert(initialised);
   need_to_exit = 1;
 }
 

sched.h

@@ -40,7 +40,7 @@ typedef enum {
 } SCH_TimeoutClass;
 
 typedef void* SCH_ArbitraryArgument;
-typedef void (*SCH_FileHandler)(SCH_ArbitraryArgument);
+typedef void (*SCH_FileHandler)(int fd, int event, SCH_ArbitraryArgument);
 typedef void (*SCH_TimeoutHandler)(SCH_ArbitraryArgument);
 
 /* Exported functions */
@@ -51,19 +51,21 @@ extern void SCH_Initialise(void);
 /* Finalisation function for the module */
 extern void SCH_Finalise(void);
 
+/* File events */
+#define SCH_FILE_INPUT 1
+#define SCH_FILE_OUTPUT 2
+#define SCH_FILE_EXCEPTION 4
+
 /* Register a handler for when select goes true on a file descriptor */
-extern void SCH_AddInputFileHandler
-(int fd,                        /* The file descriptor */
- SCH_FileHandler,               /* The handler routine */
- SCH_ArbitraryArgument          /* An arbitrary passthrough argument to the handler */
-);
-extern void SCH_RemoveInputFileHandler(int fd);
+extern void SCH_AddFileHandler(int fd, int events, SCH_FileHandler handler, SCH_ArbitraryArgument arg);
+extern void SCH_RemoveFileHandler(int fd);
+extern void SCH_SetFileHandlerEvents(int fd, int events);
 
 /* Get the time stamp taken after a file descriptor became ready or a timeout expired */
-extern void SCH_GetLastEventTime(struct timeval *cooked, double *err, struct timeval *raw);
+extern void SCH_GetLastEventTime(struct timespec *cooked, double *err, struct timespec *raw);
 
 /* This queues a timeout to elapse at a given (raw) local time */
-extern SCH_TimeoutID SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler, SCH_ArbitraryArgument);
+extern SCH_TimeoutID SCH_AddTimeout(struct timespec *ts, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg);
 
 /* This queues a timeout to elapse at a given delta time relative to the current (raw) time */
 extern SCH_TimeoutID SCH_AddTimeoutByDelay(double delay, SCH_TimeoutHandler, SCH_ArbitraryArgument);

smooth.c

@@ -93,17 +93,17 @@ static double max_freq;
 /* Frequency offset, time offset and the time of the last smoothing update */
 static double smooth_freq;
 static double smooth_offset;
-static struct timeval last_update;
+static struct timespec last_update;
 
 
 static void
-get_smoothing(struct timeval *now, double *poffset, double *pfreq,
+get_smoothing(struct timespec *now, double *poffset, double *pfreq,
               double *pwander)
 {
   double elapsed, length, offset, freq, wander;
   int i;
 
-  UTI_DiffTimevalsToDouble(&elapsed, now, &last_update);
+  elapsed = UTI_DiffTimespecsToDouble(now, &last_update);
 
   offset = smooth_offset;
   freq = smooth_freq;
@@ -137,7 +137,7 @@ get_smoothing(struct timeval *now, double *poffset, double *pfreq,
 static void
 update_stages(void)
 {
-  double s1, s2, s, l1, l2, l3, lc, f, f2;
+  double s1, s2, s, l1, l2, l3, lc, f, f2, l1t[2], l3t[2], err[2];
   int i, dir;
 
   /* Prepare the three stages so that the integral of the frequency offset
@@ -146,22 +146,41 @@ update_stages(void)
   s1 = smooth_offset / max_wander;
   s2 = smooth_freq * smooth_freq / (2.0 * max_wander * max_wander);
   
-  l1 = l2 = l3 = 0.0;
-
   /* Calculate the lengths of the 1st and 3rd stage assuming there is no
-     frequency limit.  If length of the 1st stage comes out negative, switch
-     its direction. */
-  for (dir = -1; dir <= 1; dir += 2) {
+     frequency limit.  The direction of the 1st stage is selected so that
+     the lengths will not be negative.  With extremely small offsets both
+     directions may give a negative length due to numerical errors, so select
+     the one which gives a smaller error. */
+
+  for (i = 0, dir = -1; i <= 1; i++, dir += 2) {
+    err[i] = 0.0;
     s = dir * s1 + s2;
-    if (s >= 0.0) {
-      l3 = sqrt(s);
-      l1 = l3 - dir * smooth_freq / max_wander;
-      if (l1 >= 0.0)
-        break;
+
+    if (s < 0.0) {
+      err[i] += -s;
+      s = 0.0;
+    }
+
+    l3t[i] = sqrt(s);
+    l1t[i] = l3t[i] - dir * smooth_freq / max_wander;
+
+    if (l1t[i] < 0.0) {
+      err[i] += l1t[i] * l1t[i];
+      l1t[i] = 0.0;
     }
   }
 
-  assert(dir <= 1 && l1 >= 0.0 && l3 >= 0.0);
+  if (err[0] < err[1]) {
+    l1 = l1t[0];
+    l3 = l3t[0];
+    dir = -1;
+  } else {
+    l1 = l1t[1];
+    l3 = l3t[1];
+    dir = 1;
+  }
+
+  l2 = 0.0;
 
   /* If the limit was reached, shorten 1st+3rd stages and set a 2nd stage */
   f = dir * smooth_freq + l1 * max_wander - max_freq;
@@ -195,7 +214,7 @@ update_stages(void)
 }
 
 static void
-update_smoothing(struct timeval *now, double offset, double freq)
+update_smoothing(struct timespec *now, double offset, double freq)
 {
   /* Don't accept offset/frequency until the clock has stabilized */
   if (locked) {
@@ -215,7 +234,7 @@ update_smoothing(struct timeval *now, double offset, double freq)
 }
 
 static void
-handle_slew(struct timeval *raw, struct timeval *cooked, double dfreq,
+handle_slew(struct timespec *raw, struct timespec *cooked, double dfreq,
             double doffset, LCL_ChangeType change_type, void *anything)
 {
   double delta;
@@ -227,7 +246,7 @@ handle_slew(struct timeval *raw, struct timeval *cooked, double dfreq,
       update_smoothing(cooked, doffset, dfreq);
   }
 
-  UTI_AdjustTimeval(&last_update, cooked, &last_update, &delta, dfreq, doffset);
+  UTI_AdjustTimespec(&last_update, cooked, &last_update, &delta, dfreq, doffset);
 }
 
 void SMT_Initialise(void)
@@ -258,7 +277,7 @@ int SMT_IsEnabled(void)
 }
 
 double
-SMT_GetOffset(struct timeval *now)
+SMT_GetOffset(struct timespec *now)
 {
   double offset, freq;
 
@@ -271,7 +290,7 @@ SMT_GetOffset(struct timeval *now)
 }
 
 void
-SMT_Activate(struct timeval *now)
+SMT_Activate(struct timespec *now)
 {
   if (!enabled || !locked)
     return;
@@ -283,7 +302,7 @@ SMT_Activate(struct timeval *now)
 }
 
 void
-SMT_Reset(struct timeval *now)
+SMT_Reset(struct timespec *now)
 {
   int i;
 
@@ -299,7 +318,7 @@ SMT_Reset(struct timeval *now)
 }
 
 void
-SMT_Leap(struct timeval *now, int leap)
+SMT_Leap(struct timespec *now, int leap)
 {
   /* When the leap-only mode is disabled, the leap second will be accumulated
      in handle_slew() as a normal offset */
@@ -310,7 +329,7 @@ SMT_Leap(struct timeval *now, int leap)
 }
 
 int
-SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timeval *now)
+SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timespec *now)
 {
   double length, elapsed;
   int i;
@@ -327,7 +346,7 @@ SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timeval *now)
   report->freq_ppm *= -1.0e6;
   report->wander_ppm *= -1.0e6;
 
-  UTI_DiffTimevalsToDouble(&elapsed, now, &last_update);
+  elapsed = UTI_DiffTimespecsToDouble(now, &last_update);
   if (!locked && elapsed >= 0.0) {
     for (i = 0, length = 0.0; i < NUM_STAGES; i++)
       length += stages[i].length;

smooth.h

@@ -35,14 +35,14 @@ extern void SMT_Finalise(void);
 
 extern int SMT_IsEnabled(void);
 
-extern double SMT_GetOffset(struct timeval *now);
+extern double SMT_GetOffset(struct timespec *now);
 
-extern void SMT_Activate(struct timeval *now);
+extern void SMT_Activate(struct timespec *now);
 
-extern void SMT_Reset(struct timeval *now);
+extern void SMT_Reset(struct timespec *now);
 
-extern void SMT_Leap(struct timeval *now, int leap);
+extern void SMT_Leap(struct timespec *now, int leap);
 
-extern int SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timeval *now);
+extern int SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timespec *now);
 
 #endif

sources.c

@@ -56,7 +56,7 @@ static int initialised = 0;
 struct SelectInfo {
   int stratum;
   int select_ok;
-  double variance;
+  double std_dev;
   double root_distance;
   double lo_limit;
   double hi_limit;
@@ -71,10 +71,12 @@ typedef enum {
   SRC_UNSELECTABLE,     /* Has noselect option set */
   SRC_BAD_STATS,        /* Doesn't have valid stats data */
   SRC_BAD_DISTANCE,     /* Has root distance longer than allowed maximum */
+  SRC_JITTERY,          /* Had std dev larger than allowed maximum */
   SRC_WAITS_STATS,      /* Others have bad stats, selection postponed */
   SRC_STALE,            /* Has older samples than others */
+  SRC_ORPHAN,           /* Has stratum equal or larger than orphan stratum */
+  SRC_UNTRUSTED,        /* Overlaps trusted sources */
   SRC_FALSETICKER,      /* Doesn't agree with others */
-  SRC_JITTERY,          /* Scatter worse than other's dispersion (not used) */
   SRC_WAITS_SOURCES,    /* Not enough sources, selection postponed */
   SRC_NONPREFERRED,     /* Others have prefer option */
   SRC_WAITS_UPDATE,     /* No updates, selection postponed */
@@ -157,6 +159,7 @@ static int selected_source_index; /* Which source index is currently
 #define DISTANT_PENALTY 32
 
 static double max_distance;
+static double max_jitter;
 static double reselect_distance;
 static double stratum_weight;
 static double combine_limit;
@@ -165,7 +168,7 @@ static double combine_limit;
 /* Forward prototype */
 
 static void
-slew_sources(struct timeval *raw, struct timeval *cooked, double dfreq,
+slew_sources(struct timespec *raw, struct timespec *cooked, double dfreq,
              double doffset, LCL_ChangeType change_type, void *anything);
 static void
 add_dispersion(double dispersion, void *anything);
@@ -182,6 +185,7 @@ void SRC_Initialise(void) {
   max_n_sources = 0;
   selected_source_index = INVALID_SOURCE;
   max_distance = CNF_GetMaxDistance();
+  max_jitter = CNF_GetMaxJitter();
   reselect_distance = CNF_GetReselectDistance();
   stratum_weight = CNF_GetStratumWeight();
   combine_limit = CNF_GetCombineLimit();
@@ -307,22 +311,12 @@ SRC_SetRefid(SRC_Instance instance, uint32_t ref_id, IPAddr *addr)
 }
 
 /* ================================================== */
-/* Function to get the range of frequencies, relative to the given
-   source, that we believe the local clock lies within.  The return
-   values are in terms of the number of seconds fast (+ve) or slow
-   (-ve) relative to the source that the local clock becomes after a
-   given amount of local time has elapsed.
 
-   Suppose the initial offset relative to the source is U (fast +ve,
-   slow -ve) and a time interval T elapses measured in terms of the
-   local clock.  Then the error relative to the source at the end of
-   the interval should lie in the interval [U+T*lo, U+T*hi]. */
-
-void SRC_GetFrequencyRange(SRC_Instance instance, double *lo, double *hi)
+SST_Stats
+SRC_GetSourcestats(SRC_Instance instance)
 {
   assert(initialised);
-
-  SST_GetFrequencyRange(instance->stats, lo, hi);
+  return instance->stats;
 }
 
 /* ================================================== */
@@ -340,7 +334,7 @@ void SRC_GetFrequencyRange(SRC_Instance instance, double *lo, double *hi)
 
 void SRC_AccumulateSample
 (SRC_Instance inst, 
- struct timeval *sample_time, 
+ struct timespec *sample_time,
  double offset, 
  double peer_delay,
  double peer_dispersion,
@@ -355,7 +349,8 @@ void SRC_AccumulateSample
   inst->leap_status = leap_status;
 
   DEBUG_LOG(LOGF_Sources, "ip=[%s] t=%s ofs=%f del=%f disp=%f str=%d",
-      source_to_string(inst), UTI_TimevalToString(sample_time), -offset, root_delay, root_dispersion, stratum);
+            source_to_string(inst), UTI_TimespecToString(sample_time), -offset,
+            root_delay, root_dispersion, stratum);
 
   if (REF_IsLeapSecondClose()) {
     LOG(LOGS_INFO, LOGF_Sources, "Dropping sample around leap second");
@@ -402,7 +397,7 @@ special_mode_end(void)
 
       /* Check if the source could still have enough samples to be selectable */
       if (SOURCE_REACH_BITS - 1 - sources[i]->reachability_size +
-            SRC_Samples(sources[i]) >= MIN_SAMPLES_FOR_REGRESS)
+            SST_Samples(sources[i]->stats) >= MIN_SAMPLES_FOR_REGRESS)
         return 0;
     }
 
@@ -429,9 +424,12 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
     REF_SetUnsynchronised();
   }
 
-  /* Try to replace NTP sources that are unreachable or falsetickers */
-  if (inst->type == SRC_NTP && (inst->status == SRC_FALSETICKER ||
-      (!inst->reachability && inst->reachability_size == SOURCE_REACH_BITS))) {
+  /* Try to replace NTP sources that are unreachable, falsetickers, or
+     have root distance or jitter larger than the allowed maximums */
+  if (inst->type == SRC_NTP &&
+      ((!inst->reachability && inst->reachability_size == SOURCE_REACH_BITS) ||
+       inst->status == SRC_BAD_DISTANCE || inst->status == SRC_JITTERY ||
+       inst->status == SRC_FALSETICKER)) {
     NSR_HandleBadSource(inst->ip_addr);
   }
 }
@@ -510,10 +508,10 @@ mark_ok_sources(SRC_Status status)
 /* ================================================== */
 
 static int
-combine_sources(int n_sel_sources, struct timeval *ref_time, double *offset,
+combine_sources(int n_sel_sources, struct timespec *ref_time, double *offset,
                 double *offset_sd, double *frequency, double *skew)
 {
-  struct timeval src_ref_time;
+  struct timespec src_ref_time;
   double src_offset, src_offset_sd, src_frequency, src_skew;
   double src_root_delay, src_root_dispersion, sel_src_distance, elapsed;
   double offset_weight, sum_offset_weight, sum_offset, sum2_offset_sd;
@@ -560,7 +558,7 @@ combine_sources(int n_sel_sources, struct timeval *ref_time, double *offset,
     if (sources[index]->status == SRC_OK)
       sources[index]->status = SRC_UNSELECTED;
 
-    UTI_DiffTimevalsToDouble(&elapsed, ref_time, &src_ref_time);
+    elapsed = UTI_DiffTimespecsToDouble(ref_time, &src_ref_time);
     src_offset += elapsed * src_frequency;
     offset_weight = 1.0 / sources[index]->sel_info.root_distance;
     frequency_weight = 1.0 / src_skew;
@@ -600,11 +598,12 @@ void
 SRC_SelectSource(SRC_Instance updated_inst)
 {
   struct SelectInfo *si;
-  struct timeval now, ref_time;
+  struct timespec now, ref_time;
   int i, j, j1, j2, index, sel_prefer, n_endpoints, n_sel_sources;
   int n_badstats_sources, max_sel_reach, max_badstat_reach, sel_req_source;
   int depth, best_depth, trust_depth, best_trust_depth;
   int combined, stratum, min_stratum, max_score_index;
+  int orphan_stratum, orphan_source, leap_votes, leap_ins, leap_del;
   double src_offset, src_offset_sd, src_frequency, src_skew;
   double src_root_delay, src_root_dispersion;
   double best_lo, best_hi, distance, sel_src_distance, max_score;
@@ -652,7 +651,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
     si = &sources[i]->sel_info;
     SST_GetSelectionData(sources[i]->stats, &now, &si->stratum,
                          &si->lo_limit, &si->hi_limit, &si->root_distance,
-                         &si->variance, &first_sample_ago,
+                         &si->std_dev, &first_sample_ago,
                          &si->last_sample_ago, &si->select_ok);
 
     if (!si->select_ok) {
@@ -669,6 +668,12 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
     }
 
+    /* And the same applies for the estimated standard deviation */
+    if (si->std_dev > max_jitter) {
+      sources[i]->status = SRC_JITTERY;
+      continue;
+    }
+
     sources[i]->status = SRC_OK; /* For now */
 
     if (sources[i]->reachability && max_reach_sample_ago < first_sample_ago)
@@ -678,6 +683,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
       max_sel_reach = sources[i]->reachability;
   }
 
+  orphan_stratum = REF_GetOrphanStratum();
+  orphan_source = INVALID_SOURCE;
+
   for (i = 0; i < n_sources; i++) {
     if (sources[i]->status != SRC_OK)
       continue;
@@ -692,7 +700,56 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
     }
 
+    /* When the local reference is configured with the orphan option, NTP
+       sources that have stratum equal to the configured local stratum are
+       considered to be orphans (i.e. serving local time while not being
+       synchronised with real time) and are excluded from the normal source
+       selection.  Sources with stratum larger than the local stratum are
+       considered to be directly on indirectly synchronised to an orphan and
+       are always ignored.
+
+       If no selectable source is available and all orphan sources have
+       reference IDs larger than the local ID, no source will be selected and
+       the local reference mode will be activated at some point, i.e. this host
+       will become an orphan.  Otherwise, the orphan source with the smallest
+       reference ID will be selected.  This ensures a group of servers polling
+       each other (with the same orphan configuration) which have no external
+       source can settle down to a state where only one server is serving its
+       local unsychronised time and others are synchronised to it. */
+
+    if (si->stratum >= orphan_stratum && sources[i]->type == SRC_NTP) {
+      sources[i]->status = SRC_ORPHAN;
+
+      if (si->stratum == orphan_stratum && sources[i]->reachability &&
+          (orphan_source == INVALID_SOURCE ||
+           sources[i]->ref_id < sources[orphan_source]->ref_id))
+        orphan_source = i;
+
+      continue;
+    }
+
     ++n_sel_sources;
+  }
+
+  /* If no selectable source is available, consider the orphan source */
+  if (!n_sel_sources && orphan_source != INVALID_SOURCE) {
+    uint32_t local_ref_id = NSR_GetLocalRefid(sources[orphan_source]->ip_addr);
+
+    if (!local_ref_id) {
+      LOG(LOGS_ERR, LOGF_Sources, "Unknown local refid in orphan mode");
+    } else if (sources[orphan_source]->ref_id < local_ref_id) {
+      sources[orphan_source]->status = SRC_OK;
+      n_sel_sources = 1;
+      DEBUG_LOG(LOGF_Sources, "selecting orphan refid=%"PRIx32,
+                sources[orphan_source]->ref_id);
+    }
+  }
+
+  for (i = 0; i < n_sources; i++) {
+    if (sources[i]->status != SRC_OK)
+      continue;
+
+    si = &sources[i]->sel_info;
 
     j1 = n_endpoints;
     j2 = j1 + 1;
@@ -834,6 +891,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
 
       if (sources[i]->sel_options & SRC_SELECT_REQUIRE)
         sel_req_source = 0;
+    } else if (sources[i]->sel_info.lo_limit <= best_lo &&
+               sources[i]->sel_info.hi_limit >= best_hi) {
+      sources[i]->status = SRC_UNTRUSTED;
     } else {
       sources[i]->status = SRC_FALSETICKER;
     }
@@ -850,18 +910,22 @@ SRC_SelectSource(SRC_Instance updated_inst)
     return;
   }
 
-  /* Accept leap second status if more than half of selectable sources agree */
-  for (i = j1 = j2 = 0; i < n_sel_sources; i++) {
+  /* Accept leap second status if more than half of selectable (and trusted
+     if there are any) sources agree */
+  for (i = leap_ins = leap_del = leap_votes = 0; i < n_sel_sources; i++) {
     index = sel_sources[i];
+    if (best_trust_depth && !(sources[index]->sel_options & SRC_SELECT_TRUST))
+      continue;
+    leap_votes++;
     if (sources[index]->leap_status == LEAP_InsertSecond)
-      j1++;
+      leap_ins++;
     else if (sources[index]->leap_status == LEAP_DeleteSecond)
-      j2++;
+      leap_del++;
   }
 
-  if (j1 > n_sel_sources / 2)
+  if (leap_ins > leap_votes / 2)
     leap_status = LEAP_InsertSecond;
-  else if (j2 > n_sel_sources / 2)
+  else if (leap_del > leap_votes / 2)
     leap_status = LEAP_DeleteSecond;
   else
     leap_status = LEAP_Normal;
@@ -1038,32 +1102,6 @@ SRC_SetReselectDistance(double distance)
   }
 }
 
-/* ================================================== */
-
-double
-SRC_PredictOffset(SRC_Instance inst, struct timeval *when)
-{
-  return SST_PredictOffset(inst->stats, when);
-}
-
-/* ================================================== */
-
-double
-SRC_MinRoundTripDelay(SRC_Instance inst)
-{
-  return SST_MinRoundTripDelay(inst->stats);
-}
-
-/* ================================================== */
-
-int
-SRC_IsGoodSample(SRC_Instance inst, double offset, double delay,
-   double max_delay_dev_ratio, double clock_error, struct timeval *when)
-{
-  return SST_IsGoodSample(inst->stats, offset, delay, max_delay_dev_ratio,
-      clock_error, when);
-}
-
 /* ================================================== */
 /* This routine is registered as a callback with the local clock
    module, to be called whenever the local clock changes frequency or
@@ -1072,12 +1110,8 @@ SRC_IsGoodSample(SRC_Instance inst, double offset, double delay,
    the new regime. */
 
 static void
-slew_sources(struct timeval *raw,
-             struct timeval *cooked,
-             double dfreq,
-             double doffset,
-             LCL_ChangeType change_type,
-             void *anything)
+slew_sources(struct timespec *raw, struct timespec *cooked, double dfreq,
+             double doffset, LCL_ChangeType change_type, void *anything)
 {
   int i;
 
@@ -1109,6 +1143,39 @@ add_dispersion(double dispersion, void *anything)
   }
 }
 
+/* ================================================== */
+
+static
+FILE *open_dumpfile(SRC_Instance inst, const char *mode)
+{
+  FILE *f;
+  char filename[1024], *dumpdir;
+
+  dumpdir = CNF_GetDumpDir();
+  if (dumpdir[0] == '\0') {
+    LOG(LOGS_WARN, LOGF_Sources, "dumpdir not specified");
+    return NULL;
+  }
+
+  /* Include IP address in the name for NTP sources, or reference ID in hex */
+  if ((inst->type == SRC_NTP &&
+       snprintf(filename, sizeof (filename), "%s/%s.dat", dumpdir,
+                source_to_string(inst)) >= sizeof (filename)) ||
+      (inst->type != SRC_NTP &&
+       snprintf(filename, sizeof (filename), "%s/refid:%08"PRIx32".dat",
+                dumpdir, inst->ref_id) >= sizeof (filename))) {
+    LOG(LOGS_WARN, LOGF_Sources, "dumpdir too long");
+    return NULL;
+  }
+
+  f = fopen(filename, mode);
+  if (!f && mode[0] != 'r')
+    LOG(LOGS_WARN, LOGF_Sources, "Could not open dump file for %s",
+        source_to_string(inst));
+
+  return f;
+}
+
 /* ================================================== */
 /* This is called to dump out the source measurement registers */
 
@@ -1116,34 +1183,15 @@ void
 SRC_DumpSources(void)
 {
   FILE *out;
-  int direc_len, file_len;
-  char *filename;
-  unsigned int a, b, c, d;
   int i;
-  char *direc;
-
-  direc = CNF_GetDumpDir();
-  direc_len = strlen(direc);
-  file_len = direc_len + 24;
-  filename = MallocArray(char, file_len); /* a bit of slack */
 
   for (i = 0; i < n_sources; i++) {
-    a = (sources[i]->ref_id) >> 24;
-    b = ((sources[i]->ref_id) >> 16) & 0xff;
-    c = ((sources[i]->ref_id) >> 8) & 0xff;
-    d = ((sources[i]->ref_id)) & 0xff;
-
-    snprintf(filename, file_len - 1, "%s/%d.%d.%d.%d.dat", direc, a, b, c, d);
-    out = fopen(filename, "w");
-    if (!out) {
-      LOG(LOGS_WARN, LOGF_Sources, "Could not open dump file %s", filename);
-    } else {
-      SST_SaveToFile(sources[i]->stats, out);
-      fclose(out);
-    }
+    out = open_dumpfile(sources[i], "w");
+    if (!out)
+      continue;
+    SST_SaveToFile(sources[i]->stats, out);
+    fclose(out);
   }
-
-  Free(filename);
 }
 
 /* ================================================== */
@@ -1152,40 +1200,63 @@ void
 SRC_ReloadSources(void)
 {
   FILE *in;
-  char *filename;
-  unsigned int a, b, c, d;
   int i;
-  char *dumpdir;
-  int dumpdirlen, filelen;
 
-  for (i=0; i<n_sources; i++) {
-    a = (sources[i]->ref_id) >> 24;
-    b = ((sources[i]->ref_id) >> 16) & 0xff;
-    c = ((sources[i]->ref_id) >> 8) & 0xff;
-    d = ((sources[i]->ref_id)) & 0xff;
-
-    dumpdir = CNF_GetDumpDir();
-    dumpdirlen = strlen(dumpdir);
-    filelen = dumpdirlen + 24;
-    filename = MallocArray(char, filelen);
-    snprintf(filename, filelen-1, "%s/%d.%d.%d.%d.dat", dumpdir, a, b, c, d);
-    in = fopen(filename, "r");
-    if (!in) {
-      LOG(LOGS_WARN, LOGF_Sources, "Could not open dump file %s", filename);
-    } else {
-      if (SST_LoadFromFile(sources[i]->stats, in)) {
-        SST_DoNewRegression(sources[i]->stats);
-      } else {
-        LOG(LOGS_WARN, LOGF_Sources, "Problem loading from file %s", filename);
-      }
-      fclose(in);
-    }
-    Free(filename);
+  for (i = 0; i < n_sources; i++) {
+    in = open_dumpfile(sources[i], "r");
+    if (!in)
+      continue;
+    if (!SST_LoadFromFile(sources[i]->stats, in))
+      LOG(LOGS_WARN, LOGF_Sources, "Could not load dump file for %s",
+          source_to_string(sources[i]));
+    else
+      LOG(LOGS_INFO, LOGF_Sources, "Loaded dump file for %s",
+          source_to_string(sources[i]));
+    fclose(in);
   }
 }
 
 /* ================================================== */
 
+void
+SRC_RemoveDumpFiles(void)
+{
+  char pattern[1024], name[64], *dumpdir, *s;
+  IPAddr ip_addr;
+  glob_t gl;
+  size_t i;
+
+  dumpdir = CNF_GetDumpDir();
+  if (dumpdir[0] == '\0' ||
+      snprintf(pattern, sizeof (pattern), "%s/*.dat", dumpdir) >= sizeof (pattern))
+    return;
+
+  if (glob(pattern, 0, NULL, &gl))
+    return;
+
+  for (i = 0; i < gl.gl_pathc; i++) {
+    s = strrchr(gl.gl_pathv[i], '/');
+    if (!s || snprintf(name, sizeof (name), "%s", s + 1) >= sizeof (name))
+      continue;
+
+    /* Remove .dat extension */
+    if (strlen(name) < 4)
+      continue;
+    name[strlen(name) - 4] = '\0';
+
+    /* Check if it looks like name of an actual dump file */
+    if (strncmp(name, "refid:", 6) && !UTI_StringToIP(name, &ip_addr))
+      continue;
+
+    DEBUG_LOG(LOGF_Sources, "Removing %s", gl.gl_pathv[i]);
+    unlink(gl.gl_pathv[i]);
+  }
+
+  globfree(&gl);
+}
+
+/* ================================================== */
+
 int
 SRC_IsSyncPeer(SRC_Instance inst)
 {
@@ -1230,7 +1301,7 @@ SRC_ActiveSources(void)
 /* ================================================== */
 
 int
-SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
+SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now)
 {
   SRC_Instance src;
   if ((index >= n_sources) || (index < 0)) {
@@ -1238,7 +1309,6 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
   } else {
     src = sources[index];
 
-    memset(&report->ip_addr, 0, sizeof (report->ip_addr));
     if (src->ip_addr)
       report->ip_addr = *src->ip_addr;
     else {
@@ -1248,19 +1318,13 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
     }
 
     switch (src->status) {
-      case SRC_UNSELECTABLE:
-      case SRC_BAD_STATS:
-      case SRC_BAD_DISTANCE:
-      case SRC_STALE:
-      case SRC_WAITS_STATS:
-        report->state = RPT_UNREACH;
-        break;
       case SRC_FALSETICKER:
         report->state = RPT_FALSETICKER;
         break;
       case SRC_JITTERY:
         report->state = RPT_JITTERY;
         break;
+      case SRC_UNTRUSTED:
       case SRC_WAITS_SOURCES:
       case SRC_NONPREFERRED:
       case SRC_WAITS_UPDATE:
@@ -1274,9 +1338,8 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
       case SRC_SELECTED:
         report->state = RPT_SYNC;
         break;
-      case SRC_OK:
       default:
-        assert(0);
+        report->state = RPT_UNREACH;
         break;
     }
 
@@ -1294,7 +1357,7 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
 /* ================================================== */
 
 int
-SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timeval *now)
+SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec *now)
 { 
   SRC_Instance src;
 
@@ -1323,11 +1386,3 @@ SRC_GetType(int index)
 }
 
 /* ================================================== */
-
-int
-SRC_Samples(SRC_Instance inst)
-{
-  return SST_Samples(inst->stats);
-}
-
-/* ================================================== */

sources.h

@@ -34,6 +34,7 @@
 
 #include "ntp.h"
 #include "reports.h"
+#include "sourcestats.h"
 
 /* Size of the source reachability register */
 #define SOURCE_REACH_BITS 8
@@ -73,18 +74,8 @@ extern void SRC_ResetInstance(SRC_Instance instance);
 /* Function to change the sources's reference ID and IP address */
 extern void SRC_SetRefid(SRC_Instance instance, uint32_t ref_id, IPAddr *addr);
 
-/* Function to get the range of frequencies, relative to the given
-   source, that we believe the local clock lies within.  The return
-   values are in terms of the number of seconds fast (+ve) or slow
-   (-ve) relative to the source that the local clock becomes after a
-   given amount of local time has elapsed.
-
-   Suppose the initial offset relative to the source is U (fast +ve,
-   slow -ve) and a time interval T elapses measured in terms of the
-   local clock.  Then the error relative to the source at the end of
-   the interval should lie in the interval [U+T*lo, U+T*hi]. */
-
-extern void SRC_GetFrequencyRange(SRC_Instance instance, double *lo, double *hi);
+/* Function to get access to the sourcestats instance */
+extern SST_Stats SRC_GetSourcestats(SRC_Instance instance);
 
 /* This function is called by one of the source drivers when it has
    a new sample that is to be accumulated.
@@ -114,7 +105,7 @@ extern void SRC_GetFrequencyRange(SRC_Instance instance, double *lo, double *hi)
 
    */
 
-extern void SRC_AccumulateSample(SRC_Instance instance, struct timeval *sample_time, double offset, double peer_delay, double peer_dispersion, double root_delay, double root_dispersion, int stratum, NTP_Leap leap_status);
+extern void SRC_AccumulateSample(SRC_Instance instance, struct timespec *sample_time, double offset, double peer_delay, double peer_dispersion, double root_delay, double root_dispersion, int stratum, NTP_Leap leap_status);
 
 /* This routine sets the source as receiving reachability updates */
 extern void SRC_SetActive(SRC_Instance inst);
@@ -143,34 +134,18 @@ extern void SRC_ReselectSource(void);
 /* Set reselect distance */
 extern void SRC_SetReselectDistance(double distance);
 
-/* Predict the offset of the local clock relative to a given source at
-   a given local cooked time. Positive indicates local clock is FAST
-   relative to reference. */
-extern double SRC_PredictOffset(SRC_Instance inst, struct timeval *when);
-
-/* Return the minimum peer delay amongst the previous samples
-   currently held in the register */
-extern double SRC_MinRoundTripDelay(SRC_Instance inst);
-
-/* This routine determines if a new sample is good enough that it should be
-   accumulated */
-extern int SRC_IsGoodSample(SRC_Instance inst, double offset, double delay, double max_delay_dev_ratio, double clock_error, struct timeval *when);
-
 extern void SRC_DumpSources(void);
-
 extern void SRC_ReloadSources(void);
+extern void SRC_RemoveDumpFiles(void);
 
 extern int SRC_IsSyncPeer(SRC_Instance inst);
 extern int SRC_IsReachable(SRC_Instance inst);
 extern int SRC_ReadNumberOfSources(void);
 extern int SRC_ActiveSources(void);
-extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now);
+extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now);
 
-extern int SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timeval *now);
+extern int SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec *now);
 
 extern SRC_Type SRC_GetType(int index);
 
-extern int SRC_Samples(SRC_Instance inst);
-
 #endif /* GOT_SOURCES_H */
-

sourcestats.c

@@ -47,8 +47,25 @@
    2000ppm, which would be pretty bad */
 #define WORST_CASE_FREQ_BOUND (2000.0/1.0e6)
 
-/* The minimum allowed skew */
+/* The minimum and maximum assumed skew */
 #define MIN_SKEW 1.0e-12
+#define MAX_SKEW 1.0e+02
+
+/* The minimum assumed std dev for weighting */
+#define MIN_WEIGHT_SD 1.0e-9
+
+/* The asymmetry of network jitter when all jitter is in one direction */
+#define MAX_ASYMMETRY 0.5
+
+/* The minimum estimated asymmetry that can activate the offset correction */
+#define MIN_ASYMMETRY 0.45
+
+/* The minimum number of consecutive asymmetries with the same sign needed
+   to activate the offset correction */
+#define MIN_ASYMMETRY_RUN 10
+
+/* The maximum value of the counter */
+#define MAX_ASYMMETRY_RUN 1000
 
 /* ================================================== */
 
@@ -72,8 +89,8 @@ struct SST_Stats_Record {
      buffer. */
   int n_samples;
 
-  /* Number of extra samples stored in sample_times and offsets arrays that are
-     used to extend runs test */
+  /* Number of extra samples stored in sample_times, offsets and peer_delays
+     arrays that are used to extend the runs test */
   int runs_samples;
 
   /* The index of the newest sample */
@@ -92,11 +109,18 @@ struct SST_Stats_Record {
   /* This is the estimated offset (+ve => local fast) at a particular time */
   double estimated_offset;
   double estimated_offset_sd;
-  struct timeval offset_time;
+  struct timespec offset_time;
 
   /* Number of runs of the same sign amongst the residuals */
   int nruns;
 
+  /* Number of consecutive estimated asymmetries with the same sign.
+     The sign of the number encodes the sign of the asymmetry. */
+  int asymmetry_run;
+
+  /* This is the latest estimated asymmetry of network jitter */
+  double asymmetry;
+
   /* This value contains the estimated frequency.  This is the number
      of seconds that the local clock gains relative to the reference
      source per unit local time.  (Positive => local clock fast,
@@ -108,12 +132,12 @@ struct SST_Stats_Record {
      about estimated_frequency */
   double skew;
 
-  /* This is the estimated residual variance of the data points */
-  double variance;
+  /* This is the estimated standard deviation of the data points */
+  double std_dev;
 
   /* This array contains the sample epochs, in terms of the local
      clock. */
-  struct timeval sample_times[MAX_SAMPLES * REGRESS_RUNS_RATIO];
+  struct timespec sample_times[MAX_SAMPLES * REGRESS_RUNS_RATIO];
 
   /* This is an array of offsets, in seconds, corresponding to the
      sample times.  In this module, we use the convention that
@@ -131,7 +155,7 @@ struct SST_Stats_Record {
 
   /* This is an array of peer delays, in seconds, being the roundtrip
      measurement delay to the peer */
-  double peer_delays[MAX_SAMPLES];
+  double peer_delays[MAX_SAMPLES * REGRESS_RUNS_RATIO];
 
   /* This is an array of peer dispersions, being the skew and local
      precision dispersion terms from sampling the peer */
@@ -161,7 +185,7 @@ void
 SST_Initialise(void)
 {
   logfileid = CNF_GetLogStatistics() ? LOG_FileOpen("statistics",
-      "   Date (UTC) Time     IP Address    Std dev'n Est offset  Offset sd  Diff freq   Est skew  Stress  Ns  Bs  Nr")
+      "   Date (UTC) Time     IP Address    Std dev'n Est offset  Offset sd  Diff freq   Est skew  Stress  Ns  Bs  Nr  Asym")
     : -1;
 }
 
@@ -214,10 +238,11 @@ SST_ResetInstance(SST_Stats inst)
   inst->skew = 2000.0e-6;
   inst->estimated_offset = 0.0;
   inst->estimated_offset_sd = 86400.0; /* Assume it's at least within a day! */
-  inst->offset_time.tv_sec = 0;
-  inst->offset_time.tv_usec = 0;
-  inst->variance = 16.0;
+  UTI_ZeroTimespec(&inst->offset_time);
+  inst->std_dev = 4.0;
   inst->nruns = 0;
+  inst->asymmetry_run = 0;
+  inst->asymmetry = 0.0;
 }
 
 /* ================================================== */
@@ -253,7 +278,7 @@ prune_register(SST_Stats inst, int new_oldest)
 /* ================================================== */
 
 void
-SST_AccumulateSample(SST_Stats inst, struct timeval *sample_time,
+SST_AccumulateSample(SST_Stats inst, struct timespec *sample_time,
                      double offset,
                      double peer_delay, double peer_dispersion,
                      double root_delay, double root_dispersion,
@@ -269,7 +294,7 @@ SST_AccumulateSample(SST_Stats inst, struct timeval *sample_time,
 
   /* Make sure it's newer than the last sample */
   if (inst->n_samples &&
-      UTI_CompareTimevals(&inst->sample_times[inst->last_sample], sample_time) >= 0) {
+      UTI_CompareTimespecs(&inst->sample_times[inst->last_sample], sample_time) >= 0) {
     LOG(LOGS_WARN, LOGF_SourceStats, "Out of order sample detected, discarding history for %s",
         inst->ip_addr ? UTI_IPToString(inst->ip_addr) : UTI_RefidToString(inst->refid));
     SST_ResetInstance(inst);
@@ -282,14 +307,14 @@ SST_AccumulateSample(SST_Stats inst, struct timeval *sample_time,
   inst->sample_times[n] = *sample_time;
   inst->offsets[n] = offset;
   inst->orig_offsets[m] = offset;
-  inst->peer_delays[m] = peer_delay;
+  inst->peer_delays[n] = peer_delay;
   inst->peer_dispersions[m] = peer_dispersion;
   inst->root_delays[m] = root_delay;
   inst->root_dispersions[m] = root_dispersion;
   inst->strata[m] = stratum;
  
-  if (!inst->n_samples || inst->peer_delays[m] < inst->peer_delays[inst->min_delay_sample])
-    inst->min_delay_sample = m;
+  if (!inst->n_samples || inst->peer_delays[n] < inst->peer_delays[inst->min_delay_sample])
+    inst->min_delay_sample = n;
 
   ++inst->n_samples;
 }
@@ -323,14 +348,13 @@ get_buf_index(SST_Stats inst, int i)
 static void
 convert_to_intervals(SST_Stats inst, double *times_back)
 {
-  struct timeval *newest_tv;
+  struct timespec *ts;
   int i;
 
-  newest_tv = &(inst->sample_times[inst->last_sample]);
+  ts = &inst->sample_times[inst->last_sample];
   for (i = -inst->runs_samples; i < inst->n_samples; i++) {
     /* The entries in times_back[] should end up negative */
-    UTI_DiffTimevalsToDouble(&times_back[i],
-        &inst->sample_times[get_runsbuf_index(inst, i)], newest_tv);
+    times_back[i] = UTI_DiffTimespecsToDouble(&inst->sample_times[get_runsbuf_index(inst, i)], ts);
   }
 }
 
@@ -376,15 +400,65 @@ find_min_delay_sample(SST_Stats inst)
 {
   int i, index;
 
-  inst->min_delay_sample = get_buf_index(inst, 0);
+  inst->min_delay_sample = get_runsbuf_index(inst, -inst->runs_samples);
 
-  for (i = 1; i < inst->n_samples; i++) {
-    index = get_buf_index(inst, i);
+  for (i = -inst->runs_samples + 1; i < inst->n_samples; i++) {
+    index = get_runsbuf_index(inst, i);
     if (inst->peer_delays[index] < inst->peer_delays[inst->min_delay_sample])
       inst->min_delay_sample = index;
   }
 }
 
+/* ================================================== */
+/* This function estimates asymmetry of network jitter on the path to the
+   source as a slope of offset against network delay in multiple linear
+   regression.  If the asymmetry is significant and its sign doesn't change
+   frequently, the measured offsets (which are used later to estimate the
+   offset and frequency of the clock) are corrected to correspond to the
+   minimum network delay.  This can significantly improve the accuracy and
+   stability of the estimated offset and frequency. */
+
+static void
+correct_asymmetry(SST_Stats inst, double *times_back, double *offsets)
+{
+  double asymmetry, delays[MAX_SAMPLES * REGRESS_RUNS_RATIO];
+  int i, n;
+
+  /* Don't try to estimate the asymmetry with reference clocks */
+  if (!inst->ip_addr)
+    return;
+
+  n = inst->runs_samples + inst->n_samples;
+
+  for (i = 0; i < n; i++)
+    delays[i] = inst->peer_delays[get_runsbuf_index(inst, i - inst->runs_samples)] -
+                inst->peer_delays[inst->min_delay_sample];
+
+  /* Reset the counter when the regression fails or the sign changes */
+  if (!RGR_MultipleRegress(times_back, delays, offsets, n, &asymmetry) ||
+      asymmetry * inst->asymmetry_run < 0.0) {
+    inst->asymmetry_run = 0;
+    inst->asymmetry = 0.0;
+    return;
+  }
+
+  asymmetry = CLAMP(-MAX_ASYMMETRY, asymmetry, MAX_ASYMMETRY);
+
+  if (asymmetry <= -MIN_ASYMMETRY && inst->asymmetry_run > -MAX_ASYMMETRY_RUN)
+    inst->asymmetry_run--;
+  else if (asymmetry >= MIN_ASYMMETRY && inst->asymmetry_run < MAX_ASYMMETRY_RUN)
+    inst->asymmetry_run++;
+
+  if (abs(inst->asymmetry_run) < MIN_ASYMMETRY_RUN)
+    return;
+
+  /* Correct the offsets */
+  for (i = 0; i < n; i++)
+    offsets[i] -= asymmetry * delays[i];
+
+  inst->asymmetry = asymmetry;
+}
+
 /* ================================================== */
 
 /* This defines the assumed ratio between the standard deviation of
@@ -425,7 +499,8 @@ SST_DoNewRegression(SST_Stats inst)
   
     for (i = 0, mean_distance = 0.0, min_distance = DBL_MAX; i < inst->n_samples; i++) {
       j = get_buf_index(inst, i);
-      peer_distances[i] = 0.5 * inst->peer_delays[j] + inst->peer_dispersions[j];
+      peer_distances[i] = 0.5 * inst->peer_delays[get_runsbuf_index(inst, i)] +
+                          inst->peer_dispersions[j];
       mean_distance += peer_distances[i];
       if (peer_distances[i] < min_distance) {
         min_distance = peer_distances[i];
@@ -436,8 +511,7 @@ SST_DoNewRegression(SST_Stats inst)
     /* And now, work out the weight vector */
 
     sd = mean_distance - min_distance;
-    if (sd > min_distance || sd <= 0.0)
-      sd = min_distance;
+    sd = CLAMP(MIN_WEIGHT_SD, sd, min_distance);
 
     for (i=0; i<inst->n_samples; i++) {
       sd_weight = 1.0 + SD_TO_DIST_RATIO * (peer_distances[i] - min_distance) / sd;
@@ -445,6 +519,8 @@ SST_DoNewRegression(SST_Stats inst)
     }
   }
 
+  correct_asymmetry(inst, times_back, offsets);
+
   inst->regression_ok = RGR_FindBestRegression(times_back + inst->runs_samples,
                                          offsets + inst->runs_samples, weights,
                                          inst->n_samples, inst->runs_samples,
@@ -463,26 +539,26 @@ SST_DoNewRegression(SST_Stats inst)
     inst->estimated_offset = est_intercept;
     inst->offset_time = inst->sample_times[inst->last_sample];
     inst->estimated_offset_sd = est_intercept_sd;
-    inst->variance = est_var;
+    inst->std_dev = sqrt(est_var);
     inst->nruns = nruns;
 
-    if (inst->skew < MIN_SKEW)
-      inst->skew = MIN_SKEW;
-
+    inst->skew = CLAMP(MIN_SKEW, inst->skew, MAX_SKEW);
     stress = fabs(old_freq - inst->estimated_frequency) / old_skew;
 
+    DEBUG_LOG(LOGF_SourceStats, "off=%e freq=%e skew=%e n=%d bs=%d runs=%d asym=%f arun=%d",
+              inst->estimated_offset, inst->estimated_frequency, inst->skew,
+              inst->n_samples, best_start, inst->nruns,
+              inst->asymmetry, inst->asymmetry_run);
+
     if (logfileid != -1) {
-      LOG_FileWrite(logfileid, "%s %-15s %10.3e %10.3e %10.3e %10.3e %10.3e %7.1e %3d %3d %3d",
+      LOG_FileWrite(logfileid, "%s %-15s %10.3e %10.3e %10.3e %10.3e %10.3e %7.1e %3d %3d %3d %5.2f",
               UTI_TimeToLogForm(inst->offset_time.tv_sec),
               inst->ip_addr ? UTI_IPToString(inst->ip_addr) : UTI_RefidToString(inst->refid),
-              sqrt(inst->variance),
-              inst->estimated_offset,
-              inst->estimated_offset_sd,
-              inst->estimated_frequency,
-              inst->skew,
-              stress,
-              inst->n_samples,
-              best_start, nruns);
+              inst->std_dev,
+              inst->estimated_offset, inst->estimated_offset_sd,
+              inst->estimated_frequency, inst->skew, stress,
+              inst->n_samples, best_start, inst->nruns,
+              inst->asymmetry);
     }
 
     times_back_start = inst->runs_samples + best_start;
@@ -524,12 +600,12 @@ SST_GetFrequencyRange(SST_Stats inst,
 /* ================================================== */
 
 void
-SST_GetSelectionData(SST_Stats inst, struct timeval *now,
+SST_GetSelectionData(SST_Stats inst, struct timespec *now,
                      int *stratum,
                      double *offset_lo_limit,
                      double *offset_hi_limit,
                      double *root_distance,
-                     double *variance,
+                     double *std_dev,
                      double *first_sample_ago,
                      double *last_sample_ago,
                      int *select_ok)
@@ -546,9 +622,9 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
   j = get_buf_index(inst, inst->best_single_sample);
 
   *stratum = inst->strata[get_buf_index(inst, inst->n_samples - 1)];
-  *variance = inst->variance;
+  *std_dev = inst->std_dev;
 
-  UTI_DiffTimevalsToDouble(&sample_elapsed, now, &inst->sample_times[i]);
+  sample_elapsed = UTI_DiffTimespecsToDouble(now, &inst->sample_times[i]);
   offset = inst->offsets[i] + sample_elapsed * inst->estimated_frequency;
   *root_distance = 0.5 * inst->root_delays[j] +
     inst->root_dispersions[j] + sample_elapsed * inst->skew;
@@ -560,10 +636,10 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
   double average_offset, elapsed;
   int average_ok;
   /* average_ok ignored for now */
-  UTI_DiffTimevalsToDouble(&elapsed, now, &(inst->offset_time));
+  elapsed = UTI_DiffTimespecsToDouble(now, &inst->offset_time);
   average_offset = inst->estimated_offset + inst->estimated_frequency * elapsed;
   if (fabs(average_offset - offset) <=
-      inst->peer_dispersions[j] + 0.5 * inst->peer_delays[j]) {
+      inst->peer_dispersions[j] + 0.5 * inst->peer_delays[i]) {
     average_ok = 1;
   } else {
     average_ok = 0;
@@ -571,21 +647,21 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
 #endif
 
   i = get_runsbuf_index(inst, 0);
-  UTI_DiffTimevalsToDouble(first_sample_ago, now, &inst->sample_times[i]);
+  *first_sample_ago = UTI_DiffTimespecsToDouble(now, &inst->sample_times[i]);
   i = get_runsbuf_index(inst, inst->n_samples - 1);
-  UTI_DiffTimevalsToDouble(last_sample_ago, now, &inst->sample_times[i]);
+  *last_sample_ago = UTI_DiffTimespecsToDouble(now, &inst->sample_times[i]);
 
   *select_ok = inst->regression_ok;
 
-  DEBUG_LOG(LOGF_SourceStats, "n=%d off=%f dist=%f var=%f first_ago=%f last_ago=%f selok=%d",
-            inst->n_samples, offset, *root_distance, *variance,
+  DEBUG_LOG(LOGF_SourceStats, "n=%d off=%f dist=%f sd=%f first_ago=%f last_ago=%f selok=%d",
+            inst->n_samples, offset, *root_distance, *std_dev,
             *first_sample_ago, *last_sample_ago, *select_ok);
 }
 
 /* ================================================== */
 
 void
-SST_GetTrackingData(SST_Stats inst, struct timeval *ref_time,
+SST_GetTrackingData(SST_Stats inst, struct timespec *ref_time,
                     double *average_offset, double *offset_sd,
                     double *frequency, double *skew,
                     double *root_delay, double *root_dispersion)
@@ -605,7 +681,7 @@ SST_GetTrackingData(SST_Stats inst, struct timeval *ref_time,
   *skew = inst->skew;
   *root_delay = inst->root_delays[j];
 
-  UTI_DiffTimevalsToDouble(&elapsed_sample, &inst->offset_time, &inst->sample_times[i]);
+  elapsed_sample = UTI_DiffTimespecsToDouble(&inst->offset_time, &inst->sample_times[i]);
   *root_dispersion = inst->root_dispersions[j] + inst->skew * elapsed_sample;
 
   DEBUG_LOG(LOGF_SourceStats, "n=%d freq=%f (%.3fppm) skew=%f (%.3fppm) avoff=%f offsd=%f disp=%f",
@@ -616,11 +692,11 @@ SST_GetTrackingData(SST_Stats inst, struct timeval *ref_time,
 /* ================================================== */
 
 void
-SST_SlewSamples(SST_Stats inst, struct timeval *when, double dfreq, double doffset)
+SST_SlewSamples(SST_Stats inst, struct timespec *when, double dfreq, double doffset)
 {
   int m, i;
   double delta_time;
-  struct timeval *sample, prev;
+  struct timespec *sample, prev;
   double prev_offset, prev_freq;
 
   if (!inst->n_samples)
@@ -628,9 +704,9 @@ SST_SlewSamples(SST_Stats inst, struct timeval *when, double dfreq, double doffs
 
   for (m = -inst->runs_samples; m < inst->n_samples; m++) {
     i = get_runsbuf_index(inst, m);
-    sample = &(inst->sample_times[i]);
+    sample = &inst->sample_times[i];
     prev = *sample;
-    UTI_AdjustTimeval(sample, when, sample, &delta_time, dfreq, doffset);
+    UTI_AdjustTimespec(sample, when, sample, &delta_time, dfreq, doffset);
     inst->offsets[i] += delta_time;
   }
 
@@ -638,14 +714,14 @@ SST_SlewSamples(SST_Stats inst, struct timeval *when, double dfreq, double doffs
   prev = inst->offset_time;
   prev_offset = inst->estimated_offset;
   prev_freq = inst->estimated_frequency;
-  UTI_AdjustTimeval(&(inst->offset_time), when, &(inst->offset_time),
+  UTI_AdjustTimespec(&inst->offset_time, when, &inst->offset_time,
       &delta_time, dfreq, doffset);
   inst->estimated_offset += delta_time;
   inst->estimated_frequency = (inst->estimated_frequency - dfreq) / (1.0 - dfreq);
 
   DEBUG_LOG(LOGF_SourceStats, "n=%d m=%d old_off_time=%s new=%s old_off=%f new_off=%f old_freq=%.3f new_freq=%.3f",
             inst->n_samples, inst->runs_samples,
-            UTI_TimevalToString(&prev), UTI_TimevalToString(&(inst->offset_time)),
+            UTI_TimespecToString(&prev), UTI_TimespecToString(&inst->offset_time),
             prev_offset, inst->estimated_offset,
             1.0e6 * prev_freq, 1.0e6 * inst->estimated_frequency);
 }
@@ -667,7 +743,7 @@ SST_AddDispersion(SST_Stats inst, double dispersion)
 /* ================================================== */
 
 double
-SST_PredictOffset(SST_Stats inst, struct timeval *when)
+SST_PredictOffset(SST_Stats inst, struct timespec *when)
 {
   double elapsed;
   
@@ -681,7 +757,7 @@ SST_PredictOffset(SST_Stats inst, struct timeval *when)
       return 0.0;
     }
   } else {
-    UTI_DiffTimevalsToDouble(&elapsed, when, &inst->offset_time);
+    elapsed = UTI_DiffTimespecsToDouble(when, &inst->offset_time);
     return inst->estimated_offset + elapsed * inst->estimated_frequency;
   }
 
@@ -701,20 +777,20 @@ SST_MinRoundTripDelay(SST_Stats inst)
 
 int
 SST_IsGoodSample(SST_Stats inst, double offset, double delay,
-    double max_delay_dev_ratio, double clock_error, struct timeval *when)
+    double max_delay_dev_ratio, double clock_error, struct timespec *when)
 {
   double elapsed, allowed_increase, delay_increase;
 
   if (inst->n_samples < 3)
     return 1;
 
-  UTI_DiffTimevalsToDouble(&elapsed, when, &inst->offset_time);
+  elapsed = UTI_DiffTimespecsToDouble(when, &inst->offset_time);
 
   /* Require that the ratio of the increase in delay from the minimum to the
      standard deviation is less than max_delay_dev_ratio. In the allowed
      increase in delay include also skew and clock_error. */
     
-  allowed_increase = sqrt(inst->variance) * max_delay_dev_ratio +
+  allowed_increase = inst->std_dev * max_delay_dev_ratio +
     elapsed * (inst->skew + clock_error);
   delay_increase = (delay - SST_MinRoundTripDelay(inst)) / 2.0;
 
@@ -750,12 +826,18 @@ SST_SaveToFile(SST_Stats inst, FILE *out)
     i = get_runsbuf_index(inst, m);
     j = get_buf_index(inst, m);
 
-    fprintf(out, "%08lx %08lx %.6e %.6e %.6e %.6e %.6e %.6e %.6e %d\n",
-            (unsigned long) inst->sample_times[i].tv_sec,
-            (unsigned long) inst->sample_times[i].tv_usec,
+    fprintf(out,
+#ifdef HAVE_LONG_TIME_T
+            "%08"PRIx64" %08lx %.6e %.6e %.6e %.6e %.6e %.6e %.6e %d\n",
+            (uint64_t)inst->sample_times[i].tv_sec,
+#else
+            "%08lx %08lx %.6e %.6e %.6e %.6e %.6e %.6e %.6e %d\n",
+            (unsigned long)inst->sample_times[i].tv_sec,
+#endif
+            (unsigned long)inst->sample_times[i].tv_nsec / 1000,
             inst->offsets[i],
             inst->orig_offsets[j],
-            inst->peer_delays[j],
+            inst->peer_delays[i],
             inst->peer_dispersions[j],
             inst->root_delays[j],
             inst->root_dispersions[j],
@@ -763,6 +845,8 @@ SST_SaveToFile(SST_Stats inst, FILE *out)
             inst->strata[j]);
 
   }
+
+  fprintf(out, "%d\n", inst->asymmetry_run);
 }
 
 /* ================================================== */
@@ -771,22 +855,30 @@ SST_SaveToFile(SST_Stats inst, FILE *out)
 int
 SST_LoadFromFile(SST_Stats inst, FILE *in)
 {
-  int i, line_number;
+#ifdef HAVE_LONG_TIME_T
+  uint64_t sec;
+#else
+  unsigned long sec;
+#endif
+  unsigned long usec;
+  int i;
   char line[1024];
-  unsigned long sec, usec;
   double weight;
 
   assert(!inst->n_samples);
 
   if (fgets(line, sizeof(line), in) &&
       sscanf(line, "%d", &inst->n_samples) == 1 &&
-      inst->n_samples > 0 && inst->n_samples <= MAX_SAMPLES) {
-
-    line_number = 2;
+      inst->n_samples >= 0 && inst->n_samples <= MAX_SAMPLES) {
 
     for (i=0; i<inst->n_samples; i++) {
       if (!fgets(line, sizeof(line), in) ||
-          (sscanf(line, "%lx%lx%lf%lf%lf%lf%lf%lf%lf%d\n",
+          (sscanf(line,
+#ifdef HAVE_LONG_TIME_T
+                  "%"SCNx64"%lx%lf%lf%lf%lf%lf%lf%lf%d\n",
+#else
+                  "%lx%lx%lf%lf%lf%lf%lf%lf%lf%d\n",
+#endif
                   &(sec), &(usec),
                   &(inst->offsets[i]),
                   &(inst->orig_offsets[i]),
@@ -799,40 +891,44 @@ SST_LoadFromFile(SST_Stats inst, FILE *in)
 
         /* This is the branch taken if the read FAILED */
 
-        LOG(LOGS_WARN, LOGF_SourceStats, "Failed to read data from line %d of dump file", line_number);
         inst->n_samples = 0; /* Load abandoned if any sign of corruption */
         return 0;
       } else {
 
         /* This is the branch taken if the read is SUCCESSFUL */
         inst->sample_times[i].tv_sec = sec;
-        inst->sample_times[i].tv_usec = usec;
-
-        line_number++;
+        inst->sample_times[i].tv_nsec = 1000 * usec;
+        UTI_NormaliseTimespec(&inst->sample_times[i]);
       }
     }
+
+    /* This field was not saved in older versions */
+    if (!fgets(line, sizeof(line), in) || sscanf(line, "%d\n", &inst->asymmetry_run) != 1)
+      inst->asymmetry_run = 0;
   } else {
-    LOG(LOGS_WARN, LOGF_SourceStats, "Could not read number of samples from dump file");
     inst->n_samples = 0; /* Load abandoned if any sign of corruption */
     return 0;
   }
 
+  if (!inst->n_samples)
+    return 1;
+
   inst->last_sample = inst->n_samples - 1;
   inst->runs_samples = 0;
 
   find_min_delay_sample(inst);
+  SST_DoNewRegression(inst);
 
   return 1;
-
 }
 
 /* ================================================== */
 
 void
-SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timeval *now)
+SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timespec *now)
 {
   int i, j;
-  struct timeval ago;
+  struct timespec ago;
 
   if (inst->n_samples > 0) {
     i = get_runsbuf_index(inst, inst->n_samples - 1);
@@ -842,7 +938,7 @@ SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timeval *now
     report->latest_meas_err = 0.5*inst->root_delays[j] + inst->root_dispersions[j];
     report->stratum = inst->strata[j];
 
-    UTI_DiffTimevals(&ago, now, &inst->sample_times[i]);
+    UTI_DiffTimespecs(&ago, now, &inst->sample_times[i]);
     report->latest_meas_ago = ago.tv_sec;
   } else {
     report->latest_meas_ago = (uint32_t)-1;
@@ -864,7 +960,7 @@ SST_Samples(SST_Stats inst)
 /* ================================================== */
 
 void
-SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct timeval *now)
+SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct timespec *now)
 {
   double dspan;
   double elapsed, sample_elapsed;
@@ -876,15 +972,15 @@ SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct ti
   if (inst->n_samples > 1) {
     li = get_runsbuf_index(inst, inst->n_samples - 1);
     lj = get_buf_index(inst, inst->n_samples - 1);
-    UTI_DiffTimevalsToDouble(&dspan, &inst->sample_times[li],
+    dspan = UTI_DiffTimespecsToDouble(&inst->sample_times[li],
         &inst->sample_times[get_runsbuf_index(inst, 0)]);
     report->span_seconds = (unsigned long) (dspan + 0.5);
 
     if (inst->n_samples > 3) {
-      UTI_DiffTimevalsToDouble(&elapsed, now, &inst->offset_time);
+      elapsed = UTI_DiffTimespecsToDouble(now, &inst->offset_time);
       bi = get_runsbuf_index(inst, inst->best_single_sample);
       bj = get_buf_index(inst, inst->best_single_sample);
-      UTI_DiffTimevalsToDouble(&sample_elapsed, now, &inst->sample_times[bi]);
+      sample_elapsed = UTI_DiffTimespecsToDouble(now, &inst->sample_times[bi]);
       report->est_offset = inst->estimated_offset + elapsed * inst->estimated_frequency;
       report->est_offset_err = (inst->estimated_offset_sd +
                  sample_elapsed * inst->skew +
@@ -901,7 +997,15 @@ SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct ti
 
   report->resid_freq_ppm = 1.0e6 * inst->estimated_frequency;
   report->skew_ppm = 1.0e6 * inst->skew;
-  report->sd = sqrt(inst->variance);
+  report->sd = inst->std_dev;
+}
+
+/* ================================================== */
+
+double
+SST_GetJitterAsymmetry(SST_Stats inst)
+{
+  return inst->asymmetry;
 }
 
 /* ================================================== */

sourcestats.h

@@ -61,7 +61,7 @@ extern void SST_SetRefid(SST_Stats inst, uint32_t refid, IPAddr *addr);
    stratum is the stratum of the source from which the sample came.
   */
 
-extern void SST_AccumulateSample(SST_Stats inst, struct timeval *sample_time, double offset, double peer_delay, double peer_dispersion, double root_delay, double root_dispersion, int stratum);
+extern void SST_AccumulateSample(SST_Stats inst, struct timespec *sample_time, double offset, double peer_delay, double peer_dispersion, double root_delay, double root_dispersion, int stratum);
 
 /* This function runs the linear regression operation on the data.  It
    finds the set of most recent samples that give the tightest
@@ -77,7 +77,7 @@ extern void SST_GetFrequencyRange(SST_Stats inst, double *lo, double *hi);
 
 /* Get data needed for selection */
 extern void
-SST_GetSelectionData(SST_Stats inst, struct timeval *now,
+SST_GetSelectionData(SST_Stats inst, struct timespec *now,
                      int *stratum,
                      double *offset_lo_limit,
                      double *offset_hi_limit,
@@ -89,7 +89,7 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
 
 /* Get data needed when setting up tracking on this source */
 extern void
-SST_GetTrackingData(SST_Stats inst, struct timeval *ref_time,
+SST_GetTrackingData(SST_Stats inst, struct timespec *ref_time,
                     double *average_offset, double *offset_sd,
                     double *frequency, double *skew,
                     double *root_delay, double *root_dispersion);
@@ -110,7 +110,7 @@ SST_GetTrackingData(SST_Stats inst, struct timeval *ref_time,
 
 */
 
-extern void SST_SlewSamples(SST_Stats inst, struct timeval *when, double dfreq, double doffset);
+extern void SST_SlewSamples(SST_Stats inst, struct timespec *when, double dfreq, double doffset);
 
 /* This routine is called when an indeterminate offset is introduced
    into the local time. */
@@ -119,7 +119,7 @@ extern void SST_AddDispersion(SST_Stats inst, double dispersion);
 /* Predict the offset of the local clock relative to a given source at
    a given local cooked time. Positive indicates local clock is FAST
    relative to reference. */
-extern double SST_PredictOffset(SST_Stats inst, struct timeval *when);
+extern double SST_PredictOffset(SST_Stats inst, struct timespec *when);
 
 /* Find the minimum round trip delay in the register */
 extern double SST_MinRoundTripDelay(SST_Stats inst);
@@ -127,17 +127,19 @@ extern double SST_MinRoundTripDelay(SST_Stats inst);
 /* This routine determines if a new sample is good enough that it should be
    accumulated */
 extern int SST_IsGoodSample(SST_Stats inst, double offset, double delay,
-   double max_delay_dev_ratio, double clock_error, struct timeval *when);
+   double max_delay_dev_ratio, double clock_error, struct timespec *when);
 
 extern void SST_SaveToFile(SST_Stats inst, FILE *out);
 
 extern int SST_LoadFromFile(SST_Stats inst, FILE *in);
 
-extern void SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timeval *now);
+extern void SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timespec *now);
 
-extern void SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct timeval *now);
+extern void SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct timespec *now);
 
 extern int SST_Samples(SST_Stats inst);
 
+extern double SST_GetJitterAsymmetry(SST_Stats inst);
+
 #endif /* GOT_SOURCESTATS_H */
 

srcparams.h

@@ -42,22 +42,24 @@ typedef struct {
   int max_sources;
   int min_samples;
   int max_samples;
+  int interleaved;
   int sel_options;
   uint32_t authkey;
   double max_delay;
   double max_delay_ratio;
   double max_delay_dev_ratio;
+  double offset;
 } SourceParameters;
 
 #define SRC_DEFAULT_PORT 123
 #define SRC_DEFAULT_MINPOLL 6
 #define SRC_DEFAULT_MAXPOLL 10
-#define SRC_DEFAULT_PRESEND_MINPOLL 0
+#define SRC_DEFAULT_PRESEND_MINPOLL 100
 #define SRC_DEFAULT_MAXDELAY 3.0
 #define SRC_DEFAULT_MAXDELAYRATIO 0.0
 #define SRC_DEFAULT_MAXDELAYDEVRATIO 10.0
 #define SRC_DEFAULT_MINSTRATUM 0
-#define SRC_DEFAULT_POLLTARGET 6
+#define SRC_DEFAULT_POLLTARGET 8
 #define SRC_DEFAULT_MAXSOURCES 4
 #define SRC_DEFAULT_MINSAMPLES (-1)
 #define SRC_DEFAULT_MAXSAMPLES (-1)

stubs.c

@@ -38,9 +38,11 @@
 #include "ntp_core.h"
 #include "ntp_io.h"
 #include "ntp_sources.h"
+#include "ntp_signd.h"
 #include "privops.h"
 #include "refclock.h"
 #include "sched.h"
+#include "util.h"
 
 #ifndef FEAT_ASYNCDNS
 
@@ -50,10 +52,11 @@ struct DNS_Async_Instance {
   const char *name;
   DNS_NameResolveHandler handler;
   void *arg;
+  int pipe[2];
 };
 
 static void
-resolve_name(void *anything)
+resolve_name(int fd, int event, void *anything)
 {
   struct DNS_Async_Instance *inst;
   IPAddr addrs[DNS_MAX_ADDRESSES];
@@ -61,6 +64,11 @@ resolve_name(void *anything)
   int i;
 
   inst = (struct DNS_Async_Instance *)anything;
+
+  SCH_RemoveFileHandler(inst->pipe[0]);
+  close(inst->pipe[0]);
+  close(inst->pipe[1]);
+
   status = PRV_Name2IPAddress(inst->name, addrs, DNS_MAX_ADDRESSES);
 
   for (i = 0; status == DNS_Success && i < DNS_MAX_ADDRESSES &&
@@ -82,7 +90,16 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
   inst->handler = handler;
   inst->arg = anything;
 
-  SCH_AddTimeoutByDelay(0.0, resolve_name, inst);
+  if (pipe(inst->pipe))
+    LOG_FATAL(LOGF_Nameserv, "pipe() failed");
+
+  UTI_FdSetCloexec(inst->pipe[0]);
+  UTI_FdSetCloexec(inst->pipe[1]);
+
+  SCH_AddFileHandler(inst->pipe[0], SCH_FILE_INPUT, resolve_name, inst);
+
+  if (write(inst->pipe[1], "", 1) < 0)
+    ;
 }
 
 #endif /* !FEAT_ASYNCDNS */
@@ -230,6 +247,12 @@ NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples,
   return 0;
 }
 
+uint32_t
+NSR_GetLocalRefid(IPAddr *address)
+{
+  return 0;
+}
+
 int
 NSR_TakeSourcesOnline(IPAddr *mask, IPAddr *address)
 {
@@ -285,11 +308,17 @@ NSR_ModifyPolltarget(IPAddr *address, int new_poll_target)
 }
 
 void
-NSR_ReportSource(RPT_SourceReport *report, struct timeval *now)
+NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
 {
   memset(report, 0, sizeof (*report));
 }
   
+int
+NSR_GetNTPReport(RPT_NTPReport *report)
+{
+  return 0;
+}
+
 void
 NSR_GetActivityReport(RPT_ActivityReport *report)
 {
@@ -355,9 +384,35 @@ RCL_StartRefclocks(void)
 }
 
 void
-RCL_ReportSource(RPT_SourceReport *report, struct timeval *now)
+RCL_ReportSource(RPT_SourceReport *report, struct timespec *now)
 {
   memset(report, 0, sizeof (*report));
 }
 
 #endif /* !FEAT_REFCLOCK */
+
+#ifndef FEAT_SIGND
+
+void
+NSD_Initialise(void)
+{
+}
+
+void
+NSD_Finalise(void)
+{
+}
+
+int
+NSD_GetAuthDelay(uint32_t key_id)
+{
+  return 0;
+}
+
+int
+NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length)
+{
+  return 0;
+}
+
+#endif /* !FEAT_SIGND */

sys_generic.c

@@ -71,7 +71,7 @@ static double offset_register;
 static double slew_freq;
 
 /* Time (raw) of last update of slewing frequency and offset */
-static struct timeval slew_start;
+static struct timespec slew_start;
 
 /* Limits for the slew timeout */
 #define MIN_SLEW_TIMEOUT 1.0
@@ -106,7 +106,7 @@ static void update_slew(void);
 /* Adjust slew_start on clock step */
 
 static void
-handle_step(struct timeval *raw, struct timeval *cooked, double dfreq,
+handle_step(struct timespec *raw, struct timespec *cooked, double dfreq,
             double doffset, LCL_ChangeType change_type, void *anything)
 {
   if (change_type == LCL_ChangeUnknownStep) {
@@ -115,7 +115,7 @@ handle_step(struct timeval *raw, struct timeval *cooked, double dfreq,
     offset_register = 0.0;
     update_slew();
   } else if (change_type == LCL_ChangeStep) {
-    UTI_AddDoubleToTimeval(&slew_start, -doffset, &slew_start);
+    UTI_AddDoubleToTimespec(&slew_start, -doffset, &slew_start);
   }
 }
 
@@ -138,7 +138,7 @@ start_fastslew(void)
 /* ================================================== */
 
 static void
-stop_fastslew(struct timeval *now)
+stop_fastslew(struct timespec *now)
 {
   double corr;
 
@@ -169,7 +169,7 @@ clamp_freq(double freq)
 static void
 update_slew(void)
 {
-  struct timeval now, end_of_slew;
+  struct timespec now, end_of_slew;
   double old_slew_freq, total_freq, corr_freq, duration;
 
   /* Remove currently running timeout */
@@ -178,7 +178,7 @@ update_slew(void)
   LCL_ReadRawTime(&now);
 
   /* Adjust the offset register by achieved slew */
-  UTI_DiffTimevalsToDouble(&duration, &now, &slew_start);
+  duration = UTI_DiffTimespecsToDouble(&now, &slew_start);
   offset_register -= slew_freq * duration;
 
   stop_fastslew(&now);
@@ -242,7 +242,7 @@ update_slew(void)
   }
 
   /* Restart timer for the next update */
-  UTI_AddDoubleToTimeval(&now, duration, &end_of_slew);
+  UTI_AddDoubleToTimespec(&now, duration, &end_of_slew);
   slew_timeout_id = SCH_AddTimeout(&end_of_slew, handle_end_of_slew, NULL);
   slew_start = now;
 
@@ -294,12 +294,12 @@ accrue_offset(double offset, double corr_rate)
 /* Determine the correction to generate the cooked time for given raw time */
 
 static void
-offset_convert(struct timeval *raw,
+offset_convert(struct timespec *raw,
                double *corr, double *err)
 {
   double duration, fastslew_corr, fastslew_err;
 
-  UTI_DiffTimevalsToDouble(&duration, raw, &slew_start);
+  duration = UTI_DiffTimespecsToDouble(raw, &slew_start);
 
   if (drv_get_offset_correction && fastslew_active) {
     drv_get_offset_correction(raw, &fastslew_corr, &fastslew_err);
@@ -324,19 +324,21 @@ offset_convert(struct timeval *raw,
 static int
 apply_step_offset(double offset)
 {
-  struct timeval old_time, new_time;
+  struct timespec old_time, new_time;
+  struct timeval new_time_tv;
   double err;
 
   LCL_ReadRawTime(&old_time);
-  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
+  UTI_AddDoubleToTimespec(&old_time, -offset, &new_time);
+  UTI_TimespecToTimeval(&new_time, &new_time_tv);
 
-  if (PRV_SetTime(&new_time, NULL) < 0) {
+  if (PRV_SetTime(&new_time_tv, NULL) < 0) {
     DEBUG_LOG(LOGF_SysGeneric, "settimeofday() failed");
     return 0;
   }
 
   LCL_ReadRawTime(&old_time);
-  UTI_DiffTimevalsToDouble(&err, &old_time, &new_time);
+  err = UTI_DiffTimespecsToDouble(&old_time, &new_time);
 
   lcl_InvokeDispersionNotifyHandlers(fabs(err));
 
@@ -403,7 +405,7 @@ SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_set_freq_dela
 void
 SYS_Generic_Finalise(void)
 {
-  struct timeval now;
+  struct timespec now;
 
   /* Must *NOT* leave a slew running - clock could drift way off
      if the daemon is not restarted */

sys_linux.c

@@ -50,7 +50,8 @@
 #ifdef FEAT_SCFILTER
 #include <sys/prctl.h>
 #include <seccomp.h>
-#ifdef FEAT_PHC
+#include <termios.h>
+#if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
 #include <linux/ptp_clock.h>
 #endif
 #ifdef FEAT_PPS
@@ -59,6 +60,9 @@
 #ifdef FEAT_RTC
 #include <linux/rtc.h>
 #endif
+#ifdef HAVE_LINUX_TIMESTAMPING
+#include <linux/sockios.h>
+#endif
 #endif
 
 #include "sys_linux.h"
@@ -270,6 +274,22 @@ kernelvercmp(int major1, int minor1, int patch1,
 }
 
 /* ================================================== */
+
+static void
+get_kernel_version(int *major, int *minor, int *patch)
+{
+  struct utsname uts;
+
+  if (uname(&uts) < 0)
+    LOG_FATAL(LOGF_SysLinux, "uname() failed");
+
+  *patch = 0;
+  if (sscanf(uts.release, "%d.%d.%d", major, minor, patch) < 2)
+    LOG_FATAL(LOGF_SysLinux, "Could not parse kernel version");
+}
+
+/* ================================================== */
+
 /* Compute the scaling to use on any frequency we set, according to
    the vintage of the Linux kernel being used. */
 
@@ -277,7 +297,6 @@ static void
 get_version_specific_details(void)
 {
   int major, minor, patch;
-  struct utsname uts;
   
   hz = get_hz();
 
@@ -292,15 +311,7 @@ get_version_specific_details(void)
      (CONFIG_NO_HZ aka tickless), assume the lowest commonly used fixed rate */
   tick_update_hz = 100;
 
-  if (uname(&uts) < 0) {
-    LOG_FATAL(LOGF_SysLinux, "Cannot uname(2) to get kernel version, sorry.");
-  }
-
-  patch = 0;
-  if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) < 2) {
-    LOG_FATAL(LOGF_SysLinux, "Cannot read information from uname, sorry");
-  }
-
+  get_kernel_version(&major, &minor, &patch);
   DEBUG_LOG(LOGF_SysLinux, "Linux kernel major=%d minor=%d patch=%d", major, minor, patch);
 
   if (kernelvercmp(major, minor, patch, 2, 2, 0) < 0) {
@@ -451,8 +462,8 @@ SYS_Linux_EnableSystemCallFilter(int level)
 {
   const int syscalls[] = {
     /* Clock */
-    SCMP_SYS(adjtimex), SCMP_SYS(gettimeofday), SCMP_SYS(settimeofday),
-    SCMP_SYS(time),
+    SCMP_SYS(adjtimex), SCMP_SYS(clock_gettime), SCMP_SYS(gettimeofday),
+    SCMP_SYS(settimeofday), SCMP_SYS(time),
     /* Process */
     SCMP_SYS(clone), SCMP_SYS(exit), SCMP_SYS(exit_group), SCMP_SYS(getrlimit),
     SCMP_SYS(rt_sigaction), SCMP_SYS(rt_sigreturn), SCMP_SYS(rt_sigprocmask),
@@ -462,17 +473,17 @@ SYS_Linux_EnableSystemCallFilter(int level)
     SCMP_SYS(mprotect), SCMP_SYS(mremap), SCMP_SYS(munmap), SCMP_SYS(shmdt),
     /* Filesystem */
     SCMP_SYS(access), SCMP_SYS(chmod), SCMP_SYS(chown), SCMP_SYS(chown32),
-    SCMP_SYS(fstat), SCMP_SYS(fstat64), SCMP_SYS(lseek), SCMP_SYS(rename),
-    SCMP_SYS(stat), SCMP_SYS(stat64), SCMP_SYS(statfs), SCMP_SYS(statfs64),
-    SCMP_SYS(unlink),
+    SCMP_SYS(fstat), SCMP_SYS(fstat64), SCMP_SYS(getdents), SCMP_SYS(getdents64),
+    SCMP_SYS(lseek), SCMP_SYS(rename), SCMP_SYS(stat), SCMP_SYS(stat64),
+    SCMP_SYS(statfs), SCMP_SYS(statfs64), SCMP_SYS(unlink),
     /* Socket */
     SCMP_SYS(bind), SCMP_SYS(connect), SCMP_SYS(getsockname),
-    SCMP_SYS(recvfrom), SCMP_SYS(recvmsg), SCMP_SYS(sendmmsg),
-    SCMP_SYS(sendmsg), SCMP_SYS(sendto),
+    SCMP_SYS(recvfrom), SCMP_SYS(recvmmsg), SCMP_SYS(recvmsg),
+    SCMP_SYS(sendmmsg), SCMP_SYS(sendmsg), SCMP_SYS(sendto),
     /* TODO: check socketcall arguments */
     SCMP_SYS(socketcall),
     /* General I/O */
-    SCMP_SYS(_newselect), SCMP_SYS(close), SCMP_SYS(open), SCMP_SYS(pipe),
+    SCMP_SYS(_newselect), SCMP_SYS(close), SCMP_SYS(open), SCMP_SYS(openat), SCMP_SYS(pipe),
     SCMP_SYS(poll), SCMP_SYS(read), SCMP_SYS(futex), SCMP_SYS(select),
     SCMP_SYS(set_robust_list), SCMP_SYS(write),
     /* Miscellaneous */
@@ -492,14 +503,17 @@ SYS_Linux_EnableSystemCallFilter(int level)
     { SOL_IPV6, IPV6_V6ONLY }, { SOL_IPV6, IPV6_RECVPKTINFO },
 #endif
     { SOL_SOCKET, SO_BROADCAST }, { SOL_SOCKET, SO_REUSEADDR },
-    { SOL_SOCKET, SO_TIMESTAMP },
+    { SOL_SOCKET, SO_TIMESTAMP }, { SOL_SOCKET, SO_TIMESTAMPNS },
+#ifdef HAVE_LINUX_TIMESTAMPING
+    { SOL_SOCKET, SO_SELECT_ERR_QUEUE }, { SOL_SOCKET, SO_TIMESTAMPING },
+#endif
   };
 
   const static int fcntls[] = { F_GETFD, F_SETFD };
 
   const static unsigned long ioctls[] = {
     FIONREAD, TCGETS,
-#ifdef FEAT_PPS
+#if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
     PTP_SYS_OFFSET,
 #endif
 #ifdef FEAT_PPS
@@ -507,6 +521,9 @@ SYS_Linux_EnableSystemCallFilter(int level)
 #endif
 #ifdef FEAT_RTC
     RTC_RD_TIME, RTC_SET_TIME, RTC_UIE_ON, RTC_UIE_OFF,
+#endif
+#ifdef HAVE_LINUX_TIMESTAMPING
+    SIOCETHTOOL,
 #endif
   };
 
@@ -632,3 +649,15 @@ void SYS_Linux_MemLockAll(int LockAll)
   }
 }
 #endif /* HAVE_MLOCKALL */
+
+/* ================================================== */
+
+int
+SYS_Linux_CheckKernelVersion(int req_major, int req_minor)
+{
+  int major, minor, patch;
+
+  get_kernel_version(&major, &minor, &patch);
+
+  return kernelvercmp(req_major, req_minor, 0, major, minor, patch) <= 0;
+}

sys_linux.h

@@ -39,4 +39,6 @@ extern void SYS_Linux_MemLockAll(int LockAll);
 
 extern void SYS_Linux_SetScheduler(int SchedPriority);
 
+extern int SYS_Linux_CheckKernelVersion(int req_major, int req_minor);
+
 #endif  /* GOT_SYS_LINUX_H */

sys_macosx.c

@@ -23,7 +23,7 @@
 
   =======================================================================
 
-  Driver file for the MacOS X operating system.
+  Driver file for the macOS operating system.
 
   */
 
@@ -39,6 +39,7 @@
 
 #include "sys_macosx.h"
 #include "conf.h"
+#include "local.h"
 #include "localp.h"
 #include "logging.h"
 #include "sched.h"
@@ -49,13 +50,13 @@
 
 /* This register contains the number of seconds by which the local
    clock was estimated to be fast of reference time at the epoch when
-   gettimeofday() returned T0 */
+   LCL_ReadRawTime() returned T0 */
 
 static double offset_register;
 
 /* This register contains the epoch to which the offset is referenced */
 
-static struct timeval T0;
+static struct timespec T0;
 
 /* This register contains the current estimate of the system
    frequency, in absolute (NOT ppm) */
@@ -79,7 +80,7 @@ static double adjustment_requested;
 
 static double drift_removal_interval;
 static double current_drift_removal_interval;
-static struct timeval Tdrift;
+static struct timespec Tdrift;
 
 /* weighting applied to error in calculating drift_removal_interval */
 #define ERROR_WEIGHT (0.5)
@@ -91,7 +92,7 @@ static struct timeval Tdrift;
 
 /* RTC synchronisation - once an hour */
 
-static struct timeval last_rtc_sync;
+static struct timespec last_rtc_sync;
 #define RTC_SYNC_INTERVAL (60 * 60.0)
 
 /* ================================================== */
@@ -107,9 +108,7 @@ clock_initialise(void)
   drift_removal_interval = DRIFT_REMOVAL_INTERVAL;
   current_drift_removal_interval = DRIFT_REMOVAL_INTERVAL;
 
-  if (gettimeofday(&T0, NULL) < 0) {
-    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
-  }
+  LCL_ReadRawTime(&T0);
   Tdrift = T0;
   last_rtc_sync = T0;
 
@@ -135,21 +134,19 @@ static void
 start_adjust(void)
 {
   struct timeval newadj, oldadj;
-  struct timeval T1;
+  struct timespec T1;
   double elapsed, accrued_error, predicted_error, drift_removal_elapsed;
   double adjust_required;
   double rounding_error;
   double old_adjust_remaining;
 
   /* Determine the amount of error built up since the last adjustment */
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
-  }
+  LCL_ReadRawTime(&T1);
 
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
+  elapsed = UTI_DiffTimespecsToDouble(&T1, &T0);
   accrued_error = elapsed * current_freq;
 
-  UTI_DiffTimevalsToDouble(&drift_removal_elapsed, &T1, &Tdrift);
+  drift_removal_elapsed = UTI_DiffTimespecsToDouble(&T1, &Tdrift);
 
   /* To allow for the clock being stepped either forward or backwards, clamp
      the elapsed time to bounds [ 0.0, current_drift_removal_interval ] */
@@ -165,14 +162,14 @@ start_adjust(void)
   adjust_required = - (accrued_error + offset_register + predicted_error);
 
   UTI_DoubleToTimeval(adjust_required, &newadj);
-  UTI_TimevalToDouble(&newadj, &adjustment_requested);
+  adjustment_requested = UTI_TimevalToDouble(&newadj);
   rounding_error = adjust_required - adjustment_requested;
 
   if (PRV_AdjustTime(&newadj, &oldadj) < 0) {
     LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
   }
 
-  UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
+  old_adjust_remaining = UTI_TimevalToDouble(&oldadj);
 
   offset_register = rounding_error - old_adjust_remaining - predicted_error;
 
@@ -184,7 +181,7 @@ start_adjust(void)
 static void
 stop_adjust(void)
 {
-  struct timeval T1;
+  struct timespec T1;
   struct timeval zeroadj, remadj;
   double adjustment_remaining, adjustment_achieved;
   double elapsed, elapsed_plus_adjust;
@@ -196,12 +193,10 @@ stop_adjust(void)
     LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
   }
 
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
-  }
+  LCL_ReadRawTime(&T1);
 
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
+  elapsed = UTI_DiffTimespecsToDouble(&T1, &T0);
+  adjustment_remaining = UTI_TimevalToDouble(&remadj);
 
   adjustment_achieved = adjustment_requested - adjustment_remaining;
   elapsed_plus_adjust = elapsed - adjustment_achieved;
@@ -233,22 +228,22 @@ accrue_offset(double offset, double corr_rate)
 static int
 apply_step_offset(double offset)
 {
-  struct timeval old_time, new_time, T1;
+  struct timespec old_time, new_time, T1;
+  struct timeval new_time_tv;
 
   stop_adjust();
 
-  if (gettimeofday(&old_time, NULL) < 0) {
-    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
-  }
+  LCL_ReadRawTime(&old_time);
 
-  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
+  UTI_AddDoubleToTimespec(&old_time, -offset, &new_time);
+  UTI_TimespecToTimeval(&new_time, &new_time_tv);
 
-  if (PRV_SetTime(&new_time, NULL) < 0) {
+  if (PRV_SetTime(&new_time_tv, NULL) < 0) {
     DEBUG_LOG(LOGF_SysMacOSX, "settimeofday() failed");
     return 0;
   }
 
-  UTI_AddDoubleToTimeval(&T0, -offset, &T1);
+  UTI_AddDoubleToTimespec(&T0, -offset, &T1);
   T0 = T1;
 
   start_adjust();
@@ -279,7 +274,7 @@ read_frequency(void)
 /* ================================================== */
 
 static void
-get_offset_correction(struct timeval *raw,
+get_offset_correction(struct timespec *raw,
                       double *corr, double *err)
 {
   stop_adjust();
@@ -311,9 +306,7 @@ drift_removal_timeout(SCH_ArbitraryArgument not_used)
 
   stop_adjust();
 
-  if (gettimeofday(&Tdrift, NULL) < 0) {
-    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
-  }
+  LCL_ReadRawTime(&Tdrift);
 
   current_drift_removal_interval = drift_removal_interval;
 
@@ -336,11 +329,11 @@ set_sync_status(int synchronised, double est_error, double max_error)
     drift_removal_interval = MAX(drift_removal_interval, DRIFT_REMOVAL_INTERVAL);
   } else {
     if (CNF_GetRtcSync()) {
-      struct timeval now;
+      struct timespec now;
       double rtc_sync_elapsed;
 
       SCH_GetLastEventTime(NULL, NULL, &now);
-      UTI_DiffTimevalsToDouble(&rtc_sync_elapsed, &now, &last_rtc_sync);
+      rtc_sync_elapsed = UTI_DiffTimespecsToDouble(&now, &last_rtc_sync);
       if (fabs(rtc_sync_elapsed) >= RTC_SYNC_INTERVAL) {
         /* update the RTC by applying a step of 0.0 secs */
         apply_step_offset(0.0);

sys_macosx.h

@@ -23,7 +23,7 @@
 
   =======================================================================
 
-  Header file for MacOS X driver
+  Header file for macOS driver
 
   */
 

sys_netbsd.c

@@ -60,6 +60,7 @@ static void
 accrue_offset(double offset, double corr_rate)
 {
   struct timeval newadj, oldadj;
+  double doldadj;
 
   UTI_DoubleToTimeval(-offset, &newadj);
 
@@ -67,9 +68,9 @@ accrue_offset(double offset, double corr_rate)
     LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
 
   /* Add the old remaining adjustment if not zero */
-  UTI_TimevalToDouble(&oldadj, &offset);
-  if (offset != 0.0) {
-    UTI_AddDoubleToTimeval(&newadj, offset, &newadj);
+  doldadj = UTI_TimevalToDouble(&oldadj);
+  if (doldadj != 0.0) {
+    UTI_DoubleToTimeval(-offset + doldadj, &newadj);
     if (PRV_AdjustTime(&newadj, NULL) < 0)
       LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
   }
@@ -78,7 +79,7 @@ accrue_offset(double offset, double corr_rate)
 /* ================================================== */
 
 static void
-get_offset_correction(struct timeval *raw,
+get_offset_correction(struct timespec *raw,
                       double *corr, double *err)
 {
   struct timeval remadj;
@@ -87,7 +88,7 @@ get_offset_correction(struct timeval *raw,
   if (PRV_AdjustTime(NULL, &remadj) < 0)
     LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
 
-  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
+  adjustment_remaining = UTI_TimevalToDouble(&remadj);
 
   *corr = adjustment_remaining;
   if (err) {

tempcomp.c

@@ -95,7 +95,7 @@ read_timeout(void *arg)
       DEBUG_LOG(LOGF_TempComp, "tempcomp updated to %f for %f", comp, temp);
 
       if (logfileid != -1) {
-        struct timeval now;
+        struct timespec now;
 
         LCL_ReadCookedTime(&now, NULL);
         LOG_FileWrite(logfileid, "%s %11.4e %11.4e",
@@ -135,7 +135,7 @@ read_points(const char *filename)
   while (fgets(line, sizeof (line), f)) {
     p = (struct Point *)ARR_GetNewElement(points);
     if (sscanf(line, "%lf %lf", &p->temp, &p->comp) != 2) {
-      LOG_FATAL(LOGF_Configure, "Could not read tempcomp point from %s", filename);
+      LOG_FATAL(LOGF_TempComp, "Could not read tempcomp point from %s", filename);
       break;
     }
   }
@@ -143,7 +143,7 @@ read_points(const char *filename)
   fclose(f);
 
   if (ARR_GetSize(points) < 2)
-    LOG_FATAL(LOGF_Configure, "Not enough points in %s", filename);
+    LOG_FATAL(LOGF_TempComp, "Not enough points in %s", filename);
 }
 
 void

test/compilation/001-features

@@ -6,6 +6,7 @@ cd ../..
 
 for opts in \
 	"--enable-debug" \
+	"--enable-ntp-signd" \
 	"--enable-scfilter" \
 	"--disable-asyncdns" \
 	"--disable-ipv6" \
@@ -16,6 +17,8 @@ for opts in \
 	"--disable-cmdmon" \
 	"--disable-ntp" \
 	"--disable-refclock" \
+	"--disable-timestamping" \
+	"--disable-timestamping --disable-ntp" \
 	"--disable-cmdmon --disable-ntp" \
 	"--disable-cmdmon --disable-refclock" \
 	"--disable-cmdmon --disable-ntp --disable-refclock"

test/compilation/002-scanbuild

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+cd ../..
+
+for opts in \
+	"--host-system=Linux" \
+	"--host-system=NetBSD" \
+	"--host-system=FreeBSD" \
+	"--without-nss" \
+	"--without-tomcrypt --without-nss"
+do
+	./configure $opts
+	scan-build make "$@" || exit 1
+done

test/simulation/010-multrecv

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+. ./test.common
+
+export CLKNETSIM_RECV_MULTIPLY=4
+
+test_start "multiple received packets"
+
+limit=50000
+client_server_options="minpoll 6 maxpoll 6"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+test_pass

test/simulation/011-asymjitter

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+. ./test.common
+
+test_start "asymmetric jitter"
+
+jitter=5e-4
+jitter_asymmetry=0.47
+limit=100000
+max_sync_time=2000
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+test_pass

test/simulation/105-ntpauth

@@ -4,23 +4,48 @@
 
 test_start "NTP authentication"
 
-server_conf="keyfile tmp/keys"
-client_conf="keyfile tmp/keys"
+server_conf="keyfile tmp/server.keys"
+client_conf="keyfile tmp/client.keys"
 
-cat > tmp/keys <<-EOF
-1 $(tr -c -d 'a-zA-Z0-9' < /dev/urandom 2> /dev/null | head -c 24)
-2 ASCII:$(tr -c -d 'a-zA-Z0-9' < /dev/urandom 2> /dev/null | head -c 24)
-3 MD5 ASCII:$(tr -c -d 'a-zA-Z' < /dev/urandom 2> /dev/null | head -c 24)
-4 MD5 HEX:$(tr -c -d '0-9A-F' < /dev/urandom 2> /dev/null | head -c 32)
+cat > tmp/server.keys <<-EOF
+1 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
+2 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
+3 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
+4 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
 EOF
 
-for key in 1 2 3 4; do
-	client_server_options="key $key"
-	run_test || test_fail
-	check_chronyd_exit || test_fail
-	check_source_selection || test_fail
-	check_packet_interval || test_fail
-	check_sync || test_fail
+cat > tmp/client.keys <<-EOF
+1 k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+2 ASCII:k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+3 MD5 ASCII:k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+4 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
+EOF
+
+keys=4
+
+if grep -q 'FEAT_SECHASH 1' ../../config.h; then
+	hashes="MD5 SHA1 SHA256 SHA384 SHA512"
+else
+	hashes="MD5"
+fi
+
+for hash in $hashes; do
+	keys=$[$keys + 1]
+	key=$(echo $keys $hash HEX:$(tr -c -d '0-9A-F' < /dev/urandom 2> /dev/null | \
+		head -c $[$RANDOM % 64 * 2 + 2]))
+	echo "$key" >> tmp/server.keys
+	echo "$key" >> tmp/client.keys
+done
+
+for version in 3 4; do
+	for key in $(seq $keys); do
+		client_server_options="version $version key $key"
+		run_test || test_fail
+		check_chronyd_exit || test_fail
+		check_source_selection || test_fail
+		check_packet_interval || test_fail
+		check_sync || test_fail
+	done
 done
 
 server_conf=""
@@ -31,7 +56,7 @@ check_chronyd_exit || test_fail
 check_sync && test_fail
 check_packet_interval || test_fail
 
-server_conf="keyfile tmp/keys"
+server_conf="keyfile tmp/server.keys"
 client_conf=""
 
 run_test || test_fail
@@ -40,10 +65,10 @@ check_chronyd_exit || test_fail
 check_sync && test_fail
 check_packet_interval || test_fail
 
-client_conf="keyfile tmp/keys"
+client_conf="keyfile tmp/client.keys"
 clients=2
 peers=2
-max_sync_time=300
+max_sync_time=500
 base_delay="$default_base_delay (* -1 (equal 0.1 from 3) (equal 0.1 to 1))"
 client_lpeer_options="key 1"
 client_rpeer_options="key 1"

test/simulation/110-chronyc

@@ -11,9 +11,9 @@ sourcestats"
 run_test || test_fail
 check_chronyd_exit || test_fail
 
-check_chronyc_output "^Reference ID    : 192\.168\.123\.1 \(192\.168\.123\.1\)
+check_chronyc_output "^Reference ID    : C0A87B01 \(192\.168\.123\.1\)
 Stratum         : 2
-Ref time \(UTC\)  : Fri Jan  1 00:1.:.. 2010
+Ref time \(UTC\)  : Fri Jan 01 00:1.:.. 2010
 System time     : 0\.0000..... seconds (slow|fast) of NTP time
 Last offset     : [+-]0\.000...... seconds
 RMS offset      : 0\.000...... seconds
@@ -25,7 +25,7 @@ Root dispersion : 0\.000... seconds
 Update interval : [0-9]+\.. seconds
 Leap status     : Normal
 210 Number of sources = 1
-MS Name/IP address         Stratum Poll Reach LastRx Last sample
+MS Name/IP address         Stratum Poll Reach LastRx Last sample               
 ===============================================================================
 \^\* 192\.168\.123\.1                 1   [67]   377    [0-9]+ [0-9 +-]+[un]s\[[0-9 +-]+[un]s\] \+/-[ 0-9]+[un]s
 210 Number of sources = 1

test/simulation/113-leapsecond

@@ -7,6 +7,7 @@ export CLKNETSIM_START_DATE=$(TZ=UTC date -d 'Dec 30 2008 0:00:00' +'%s')
 
 leap=$[2 * 24 * 3600]
 limit=$[4 * 24 * 3600]
+client_start=$[2 * 3600]
 server_conf="refclock SHM 0 dpoll 10 poll 10
 leapsectz right/UTC"
 refclock_jitter=1e-9
@@ -27,14 +28,25 @@ for leapmode in system step slew; do
 	check_sync || test_fail
 done
 
+client_server_options="trust"
+client_conf="refclock SHM 0 dpoll 10 poll 10 delay 1e-3"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+client_server_options=""
+client_conf="leapsecmode system"
+min_sync_time=230000
+max_sync_time=240000
+
 for smoothmode in "" "leaponly"; do
 	server_conf="refclock SHM 0 dpoll 10 poll 10
 	leapsectz right/UTC
 	leapsecmode slew
 	smoothtime 400 0.001 $smoothmode"
-	client_conf="leapsecmode system"
-	min_sync_time=230000
-	max_sync_time=240000
 
 	run_test || test_fail
 	check_chronyd_exit || test_fail

test/simulation/114-presend

@@ -3,7 +3,7 @@
 . ./test.common
 test_start "presend option"
 
-min_sync_time=140
+min_sync_time=136
 max_sync_time=260
 client_server_options="presend 6 maxdelay 16"
 client_conf="maxdistance 10"

test/simulation/115-cmdmontime

@@ -10,11 +10,11 @@ grep -q 'HAVE_LONG_TIME_T 1' ../../config.h || test_skip
 limit=2
 client_server_options="noselect"
 client_conf="local stratum 1"
-chronyc_start="0.5"
+chronyc_start="1.5"
 chronyc_conf="tracking"
 
 for year in `seq 1850 100 2300`; do
-	date="Jan  1 00:00:00 $year"
+	date="Jan 01 00:00:00 $year"
 	export CLKNETSIM_START_DATE=$(date -d "$date UTC" +'%s')
 	run_test || test_fail
 	check_chronyd_exit || test_fail

test/simulation/119-smoothtime

@@ -19,7 +19,8 @@ refclock_offset="(* 10.0 (equal 0.1 (max (sum 1.0) 1000) 1000))"
 server_step="(* -10.0 (equal 0.1 (sum 1.0) 1))"
 server_strata=1
 server_conf="refclock SHM 0 dpoll 4 poll 6
-smoothtime 2000 1"
+smoothtime 2000 1
+maxjitter 10.0"
 time_offset=-10
 client_server_options="minpoll 6 maxpoll 6"
 client_conf="corrtimeratio 100"

test/simulation/121-orphan

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+. ./test.common
+
+test_start "orphan option"
+
+server_strata=3
+server_conf="local stratum 5 orphan
+server 192.168.123.1
+server 192.168.123.2
+server 192.168.123.3"
+max_sync_time=500
+chronyc_start=300
+chronyc_conf="tracking"
+time_rms_limit=5e-4
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+check_chronyc_output "^.*Stratum *: 7.*$" || test_fail
+
+test_pass

test/simulation/122-xleave

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+. ./test.common
+test_start "interleaved mode"
+
+client_server_options="xleave"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+clients=2
+peers=2
+max_sync_time=500
+base_delay="(+ 1e-4 (* -1 (equal 0.1 from 2) (equal 0.1 to 1)))"
+
+client_lpeer_options="xleave minpoll 5 maxpoll 5"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+# These checks are expected to fail
+check_source_selection && test_fail
+check_sync && test_fail
+
+for rpoll in 4 5 6; do
+	client_rpeer_options="xleave minpoll $rpoll maxpoll $rpoll"
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+done
+
+test_pass

test/simulation/test.common

@@ -31,6 +31,7 @@ default_time_offset=1e-1
 default_freq_offset=1e-4
 default_base_delay=1e-4
 default_jitter=1e-4
+default_jitter_asymmetry=0.0
 default_wander=1e-9
 default_refclock_jitter=""
 default_refclock_offset=0.0
@@ -154,7 +155,16 @@ get_wander_expr() {
 
 
 get_delay_expr() {
-	echo "(+ $base_delay (* $jitter (exponential)))"
+	local direction=$1 asym
+
+	if [ $jitter_asymmetry == "0.0" ]; then
+		asym=""
+	elif [ $direction = "up" ]; then
+		asym=$(awk "BEGIN {print 1 - 2 * $jitter_asymmetry}")
+	elif [ $direction = "down" ]; then
+		asym=$(awk "BEGIN {print 1 + 2 * $jitter_asymmetry}")
+	fi
+	echo "(+ $base_delay (* $asym $jitter (exponential)))"
 }
 
 get_refclock_expr() {
@@ -378,8 +388,8 @@ run_test() {
 		echo "node${i}_shift_pll = $shift_pll"
 		for j in $(seq 1 $nodes); do
 			[ $i -eq $j ] && continue
-			echo "node${i}_delay${j} = $(get_delay_expr)"
-			echo "node${j}_delay${i} = $(get_delay_expr)"
+			echo "node${i}_delay${j} = $(get_delay_expr up)"
+			echo "node${j}_delay${i} = $(get_delay_expr down)"
 		done
 	done > tmp/conf
 

test/unit/Makefile.in

@@ -33,6 +33,9 @@ clean:
 	rm -f *.o $(TESTS)
 	rm -rf .deps
 
+distclean: clean
+	rm -f Makefile
+
 .deps:
 	@mkdir .deps
 

test/unit/clientlog.c

@@ -25,7 +25,7 @@ void
 test_unit(void)
 {
   int i, j, index;
-  struct timeval tv;
+  struct timespec ts;
   IPAddr ip;
   char conf[][100] = {
     "clientloglimit 10000",
@@ -44,33 +44,33 @@ test_unit(void)
   for (i = 0; i < 500; i++) {
     DEBUG_LOG(0, "iteration %d", i);
 
-    tv.tv_sec = (time_t)random() & 0x0fffffff;
-    tv.tv_usec = 0;
+    ts.tv_sec = (time_t)random() & 0x0fffffff;
+    ts.tv_nsec = 0;
 
     for (j = 0; j < 1000; j++) {
       TST_GetRandomAddress(&ip, IPADDR_UNSPEC, i % 8 ? -1 : i / 8 % 9);
       DEBUG_LOG(0, "address %s", UTI_IPToString(&ip));
 
       if (random() % 2) {
-        index = CLG_LogNTPAccess(&ip, &tv);
+        index = CLG_LogNTPAccess(&ip, &ts);
         TEST_CHECK(index >= 0);
         CLG_LimitNTPResponseRate(index);
       } else {
-        index = CLG_LogCommandAccess(&ip, &tv);
+        index = CLG_LogCommandAccess(&ip, &ts);
         TEST_CHECK(index >= 0);
         CLG_LimitCommandResponseRate(index);
       }
 
-      UTI_AddDoubleToTimeval(&tv, (1 << random() % 14) / 100.0, &tv);
+      UTI_AddDoubleToTimespec(&ts, (1 << random() % 14) / 100.0, &ts);
     }
   }
 
   DEBUG_LOG(0, "records %d", ARR_GetSize(records));
-  TEST_CHECK(ARR_GetSize(records) == 128);
+  TEST_CHECK(ARR_GetSize(records) == 64);
 
   for (i = j = 0; i < 10000; i++) {
-    tv.tv_sec += 1;
-    index = CLG_LogNTPAccess(&ip, &tv);
+    ts.tv_sec += 1;
+    index = CLG_LogNTPAccess(&ip, &ts);
     TEST_CHECK(index >= 0);
     if (!CLG_LimitNTPResponseRate(index))
       j++;

test/unit/hwclock.c

@@ -0,0 +1,72 @@
+/*
+ **********************************************************************
+ * 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.
+ * 
+ **********************************************************************
+ */
+
+#include <hwclock.c>
+#include "test.h"
+
+void
+test_unit(void)
+{
+  struct timespec start_hw_ts, start_local_ts, hw_ts, local_ts, ts;
+  HCL_Instance clock;
+  double freq, jitter, interval, d;
+  int i, j;
+
+  LCL_Initialise();
+
+  clock = HCL_CreateInstance();
+
+  for (i = 0; i < 2000; i++) {
+    UTI_ZeroTimespec(&start_hw_ts);
+    UTI_ZeroTimespec(&start_local_ts);
+    UTI_AddDoubleToTimespec(&start_hw_ts, TST_GetRandomDouble(0.0, 1e9), &start_hw_ts);
+    UTI_AddDoubleToTimespec(&start_local_ts, TST_GetRandomDouble(0.0, 1e9), &start_local_ts);
+
+    DEBUG_LOG(0, "iteration %d", i);
+
+    freq = TST_GetRandomDouble(0.9, 1.1);
+    jitter = TST_GetRandomDouble(10.0e-9, 1000.0e-9);
+    interval = TST_GetRandomDouble(MIN_SAMPLE_SEPARATION / 10, MIN_SAMPLE_SEPARATION * 10.0);
+
+    clock->n_samples = 0;
+    clock->valid_coefs = 0;
+
+    for (j = 0; j < 100; j++) {
+      UTI_AddDoubleToTimespec(&start_hw_ts, j * interval * freq + TST_GetRandomDouble(-jitter, jitter), &hw_ts);
+      UTI_AddDoubleToTimespec(&start_local_ts, j * interval, &local_ts);
+      if (HCL_CookTime(clock, &hw_ts, &ts, NULL)) {
+        d = UTI_DiffTimespecsToDouble(&ts, &local_ts);
+        TEST_CHECK(fabs(d) <= 5.0 * jitter);
+      }
+
+      if (HCL_NeedsNewSample(clock, &local_ts))
+        HCL_AccumulateSample(clock, &hw_ts, &local_ts, 2.0 * jitter);
+
+      TEST_CHECK(j < 20 || clock->valid_coefs);
+
+      if (!clock->valid_coefs)
+        continue;
+
+      TEST_CHECK(fabs(clock->offset) <= 2.0 * jitter);
+    }
+  }
+
+  LCL_Finalise();
+}