doc: update NEWS

- fix redundant words, word order, articles, consistency, typos
- avoid slashes, contractions, `may`, dashes in running text
- add Oxford commas
- use colon before examples

.gitignore

@@ -2,20 +2,24 @@
 .vimrc
 *.o
 *.swp
-RELEASES
-Makefile
-chrony.conf.5
-chrony.info
-chrony.html
-chrony.texi
-chrony.txt
-chronyc
-chronyc.1
-chronyd
-chronyd.8
-config.h
-config.log
+*.dSYM
+*.DS_Store
 tags
-version.h
+/RELEASES
+/Makefile
+/chronyc
+/chronyd
+/config.h
+/config.log
+/doc/Makefile
+/doc/*.html
+/doc/*.man
+/doc/*.man.in
+/doc/*.txt
+/getdate.c
+/version.h
 /test/simulation/clknetsim
 /test/simulation/tmp
+/test/unit/Makefile
+/test/unit/*.test
+/test/unit/*.o

Makefile.in

@@ -24,9 +24,6 @@
 SYSCONFDIR=@SYSCONFDIR@
 BINDIR=@BINDIR@
 SBINDIR=@SBINDIR@
-MANDIR=@MANDIR@
-INFODIR=@INFODIR@
-DOCDIR=@DOCDIR@
 LOCALSTATEDIR=@LOCALSTATEDIR@
 CHRONYVARDIR=@CHRONYVARDIR@
 
@@ -38,13 +35,13 @@ DESTDIR=
 
 HASH_OBJ = @HASH_OBJ@
 
-OBJS = array.o cmdparse.o conf.o local.o logging.o main.o memory.o mkdirpp.o \
+OBJS = array.o cmdparse.o conf.o local.o logging.o main.o memory.o \
        reference.o regress.o rtc.o sched.o sources.o sourcestats.o stubs.o \
        sys.o smooth.o tempcomp.o util.o $(HASH_OBJ)
 
 EXTRA_OBJS=@EXTRA_OBJECTS@
 
-CLI_OBJS = client.o nameserv.o getdate.o cmdparse.o \
+CLI_OBJS = array.o client.o cmdparse.o getdate.o memory.o nameserv.o \
            pktlength.o util.o $(HASH_OBJ)
 
 ALL_OBJS = $(OBJS) $(EXTRA_OBJS) $(CLI_OBJS)
@@ -73,14 +70,17 @@ $(HASH_OBJ) : $(patsubst %.o,%.c,$(HASH_OBJ))
 	$(CC) $(CFLAGS) $(CPPFLAGS) @HASH_COMPILE@ -c $<
 
 distclean : clean
-	-rm -f Makefile
-	-rm -f chrony.conf.5 chrony.texi chronyc.1 chronyd.8
+	-rm -f .DS_Store
+	-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
 
-getdate.c :
+getdate.c : getdate.y
 	bison -o getdate.c getdate.y
 
 # This can be used to force regeneration of getdate.c
@@ -90,15 +90,10 @@ getdate :
 # For install, don't use the install command, because its switches
 # seem to vary between systems.
 
-install: chronyd chronyc chrony.txt
+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 $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
-	[ -d $(DESTDIR)$(MANDIR)/man1 ] || mkdir -p $(DESTDIR)$(MANDIR)/man1
-	[ -d $(DESTDIR)$(MANDIR)/man5 ] || mkdir -p $(DESTDIR)$(MANDIR)/man5
-	[ -d $(DESTDIR)$(MANDIR)/man8 ] || mkdir -p $(DESTDIR)$(MANDIR)/man8
-	[ -d $(DESTDIR)$(DOCDIR) ] || mkdir -p $(DESTDIR)$(DOCDIR)
 	[ -d $(DESTDIR)$(CHRONYVARDIR) ] || mkdir -p $(DESTDIR)$(CHRONYVARDIR)
 	if [ -f $(DESTDIR)$(SBINDIR)/chronyd ]; then rm -f $(DESTDIR)$(SBINDIR)/chronyd ; fi
 	if [ -f $(DESTDIR)$(BINDIR)/chronyc ]; then rm -f $(DESTDIR)$(BINDIR)/chronyc ; fi
@@ -106,20 +101,13 @@ install: chronyd chronyc chrony.txt
 	chmod 755 $(DESTDIR)$(SBINDIR)/chronyd
 	cp chronyc $(DESTDIR)$(BINDIR)/chronyc
 	chmod 755 $(DESTDIR)$(BINDIR)/chronyc
-	cp chrony.txt $(DESTDIR)$(DOCDIR)/chrony.txt
-	chmod 644 $(DESTDIR)$(DOCDIR)/chrony.txt
-	cp COPYING $(DESTDIR)$(DOCDIR)/COPYING
-	chmod 644 $(DESTDIR)$(DOCDIR)/COPYING
-	cp README $(DESTDIR)$(DOCDIR)/README
-	chmod 644 $(DESTDIR)$(DOCDIR)/README
-	cp chrony.1 $(DESTDIR)$(MANDIR)/man1
-	chmod 644 $(DESTDIR)$(MANDIR)/man1/chrony.1
-	cp chronyc.1 $(DESTDIR)$(MANDIR)/man1
-	chmod 644 $(DESTDIR)$(MANDIR)/man1/chronyc.1
-	cp chronyd.8 $(DESTDIR)$(MANDIR)/man8
-	chmod 644 $(DESTDIR)$(MANDIR)/man8/chronyd.8
-	cp chrony.conf.5 $(DESTDIR)$(MANDIR)/man5
-	chmod 644 $(DESTDIR)$(MANDIR)/man5/chrony.conf.5
+	$(MAKE) -C doc install
+
+docs :
+	$(MAKE) -C doc docs
+
+install-docs :
+	$(MAKE) -C doc install-docs
 
 %.o : %.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
@@ -128,29 +116,14 @@ install: chronyd chronyc chrony.txt
 	$(CC) $(CFLAGS) $(CPPFLAGS) -S $<
 
 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
+	@echo
+	@exit 1
 
 .deps:
 	@mkdir .deps

NEWS

@@ -1,3 +1,127 @@
+New in version 2.4
+==================
+
+Enhancements
+------------
+* Add orphan option to local directive for orphan mode compatible with ntpd
+* Add distance option to local directive to set activation threshold
+  (1 second by default)
+* Add maxdrift directive to set maximum allowed drift of system clock
+* Try to replace NTP sources exceeding maximum distance
+* Randomise source replacement to avoid getting stuck with bad sources
+* Randomise selection of sources from pools on start
+* Ignore reference timestamp as ntpd doesn't always set it correctly
+* Modify tracking report to use same values as seen by NTP clients
+* Add -c option to chronyc to write reports in CSV format
+* Provide detailed manual pages
+
+Bug fixes
+---------
+* Fix SOCK refclock to work correctly when not specified as last refclock
+* Fix initstepslew and -q/-Q options to accept time from own NTP clients
+* Fix authentication with keys using 512-bit hash functions
+* Fix crash on exit when multiple signals are received
+* Fix conversion of very small floating-point numbers in command packets
+
+Removed features
+----------------
+* Drop documentation in Texinfo format
+
+New in version 2.3
+==================
+
+Enhancements
+------------
+* Add support for NTP and command response rate limiting
+* Add support for dropping root privileges on Mac OS X, FreeBSD, Solaris
+* Add require and trust options for source selection
+* Enable logchange by default (1 second threshold)
+* Set RTC on Mac OS X with rtcsync directive
+* Allow binding to NTP port after dropping root privileges on NetBSD
+* Drop CAP_NET_BIND_SERVICE capability on Linux when NTP port is disabled
+* Resolve names in separate process when seccomp filter is enabled
+* Replace old records in client log when memory limit is reached
+* Don't reveal local time and synchronisation state in client packets
+* Don't keep client sockets open for longer than necessary
+* Ignore poll in KoD RATE packets as ntpd doesn't always set it correctly
+* Warn when using keys shorter than 80 bits
+* Add keygen command to generate random keys easily
+* Add serverstats command to report NTP and command packet statistics
+
+Bug fixes
+---------
+* Fix clock correction after making step on Mac OS X
+* Fix building on Solaris
+
+New in version 2.2.1
+====================
+
+Security fixes
+--------------
+* Restrict authentication of NTP server/peer to specified key (CVE-2016-1567)
+
+New in version 2.2
+==================
+
+Enhancements
+------------
+* Add support for configuration and monitoring over Unix domain socket
+  (accessible by root or chrony user when root privileges are dropped)
+* Add support for system call filtering with seccomp on Linux (experimental)
+* Add support for dropping root privileges on NetBSD
+* Control frequency of system clock on FreeBSD, NetBSD, Solaris
+* Add system leap second handling mode on FreeBSD, NetBSD, Solaris
+* Add dynamic drift removal on Mac OS X
+* Add support for setting real-time priority on Mac OS X
+* Add maxdistance directive to limit source selection by root distance
+  (3 seconds by default)
+* Add refresh command to get new addresses of NTP sources
+* Allow wildcard patterns in include directive
+* Restore time from driftfile with -s option if later than RTC time
+* Add configure option to set default hwclockfile
+* Add -d option to chronyc to enable debug messages
+* Allow multiple addresses to be specified for chronyc with -h option
+  and reconnect when no valid reply is received
+* Make check interval in waitsync command configurable
+
+Bug fixes
+---------
+* Fix building on NetBSD, Solaris
+* Restore time from driftfile with -s option if reading RTC failed
+
+Removed features
+----------------
+* Drop support for authentication with command key (run-time configuration
+  is now allowed only for local users that can access the Unix domain socket)
+
+New in version 2.1.1
+====================
+
+Bug fixes
+---------
+* Fix clock stepping by integer number of seconds on Linux
+
+New in version 2.1
+==================
+
+Enhancements
+------------
+* Add support for Mac OS X
+* Try to replace unreachable and falseticker servers/peers specified
+  by name like pool sources
+* Add leaponly option to smoothtime directive to allow synchronised
+  leap smear between multiple servers
+* Use specific reference ID when smoothing served time
+* Add smoothing command to report time smoothing status
+* Add smoothtime command to activate or reset time smoothing
+
+Bug fixes
+---------
+* Fix crash in source selection with preferred sources
+* Fix resetting of time smoothing
+* Include packet precision in peer dispersion
+* Fix crash in chronyc on invalid command syntax
+
 New in version 2.0
 ==================
 
@@ -15,7 +139,7 @@ Enhancements
 * Improve source selection
 * Handle offline sources as unreachable
 * Open NTP server port only when necessary (client access is allowed by
-  allow directive/command, peer or broadcast is configured)
+  allow directive/command or peer/broadcast is configured)
 * Change default bindcmdaddress to loopback address
 * Change default maxdelay to 3 seconds
 * Change default stratumweight to 0.001
@@ -30,6 +154,7 @@ Bug fixes
 ---------
 * Add sanity checks for time and frequency offset
 * Don't report synchronised status during leap second
+* Don't combine reference clocks with close NTP sources
 * Fix accepting requests from configured sources
 * Fix initial fallback drift setting
 
@@ -39,7 +164,7 @@ New in version 1.31.1
 Security fixes
 --------------
 * Protect authenticated symmetric NTP associations against DoS attacks
-  (CVE-2015-1799)
+  (CVE-2015-1853)
 * Fix access configuration with subnet size indivisible by 4 (CVE-2015-1821)
 * Fix initialization of reply slots for authenticated commands (CVE-2015-1822)
 

README

@@ -3,67 +3,35 @@ This is the README for chrony.
 What is chrony?
 ===============
 
-Chrony is a pair of programs for maintaining the accuracy of computer
-clocks.
+chrony is a versatile implementation of the Network Time Protocol (NTP).
+It can synchronize the system clock with NTP servers, reference clocks
+(e.g. GPS receiver), and manual input using wristwatch and keyboard.
+It can also operate as an NTPv4 (RFC 5905) server and peer to provide
+a time service to other computers in the network.
 
-chronyd is a (background) daemon program that can be started at boot
-time.  This does most of the work.
+It is designed to perform well in a wide range of conditions, including
+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.
 
-chronyc is a command-line interface program which can be used to
-monitor chronyd's performance and to change various operating
-parameters whilst it is running.
-
-chronyd's main function is to obtain measurements of the true (UTC)
-time from one of several sources, and correct the system clock
-accordingly.  It also works out the rate at which the system clock
-gains or loses time and uses this information to keep it accurate
-between measurements from the reference.
-
-The reference time can be derived from Network Time Protocol (NTP)
-servers, reference clocks, or wristwatch-and-keyboard (via chronyc).
-The main source of information about the Network Time Protocol is
-http://www.ntp.org.
-
-It is designed so that it can work on computers which only have
-intermittent access to reference sources, for example computers which
-use a dial-up account to access the Internet or laptops.  Of course, it
-will work well on computers with permanent connections too.
-
-In addition, on Linux it can monitor the system's real time clock
-performance, so the system can maintain accurate time even across
-reboots.
-
-Typical accuracies available between 2 machines are
-
-On an ethernet LAN : 100-200 microseconds, often much better
-On a V32bis dial-up modem connection : 10's of milliseconds (from one
-session to the next)
-
-With a good reference clock the accuracy can reach one microsecond.
-
-chronyd can also operate as an NTPv4 (RFC 5905) server, peer and broadcast
-server.
+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.
 
+Two programs are included in chrony, chronyd is a daemon that can be
+started at boot time and chronyc is a command-line interface program
+which can be used to monitor chronyd's performance and to change various
+operating parameters whilst it is running.
 
 What will chrony run on?
 ========================
 
-Chrony can be successfully built and run on
-
-1. Linux 2.2.x, 2.3.x, 2.4.x, 2.6.x, 3.x
-
-2. Solaris 2.5/2.5.1/2.6/2.7/2.8 (various platforms) 
-
-3. SunOS 4.1.4 (Sparc 2 and Sparc 20)
-
-4. BSD/386 v1.1 has been reported to work using the SunOS 4.1 driver.
-
-5. NetBSD.
-
-Any other system will require a porting exercise.  You would need to
-start from one of the existing system-specific drivers and look into
-the quirks of certain system calls and the kernel on your target
-system.
+The software is known to work on Linux, FreeBSD, NetBSD, Mac OS X 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
+certain system calls and the kernel on your target system.
 
 How do I set it up?
 ===================
@@ -85,7 +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?
 =================================
@@ -116,6 +84,17 @@ 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
 ======
@@ -132,6 +111,10 @@ 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 :
 
@@ -155,6 +138,11 @@ Stephan I. Boettcher <stephan@nevis1.columbia.edu>
 Erik Bryer <ebryer@spots.ab.ca>
     Entries in contrib directory
 
+Bryan Christianson <bryan@whatroute.net>
+    Support for Mac OS X
+    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.
 
@@ -169,6 +157,9 @@ Alexander Gretencord <arutha@gmx.de>
     Changes to installation directory system to make it easier for
     package builders.
 
+Andrew Griffiths <agriffit@redhat.com>
+    Patch to add support for seccomp filter
+
 Walter Haidinger <walter.haidinger@gmx.at>
     Providing me with login access to a Linux installation where v1.12
     wouldn't compile, so I could develop the fixes for v1.13.  Also, for
@@ -228,12 +219,18 @@ Kalle Olavi Niemitalo  <tosi@stekt.oulu.fi>
 Frank Otto <sandwichmacher@web.de>
     Handling arbitrary HZ values
 
+Gautier PHILIPPON <gautier.philippon@ensimag.grenoble-inp.fr>
+    Patch to add refresh command to chronyc
+
 Andreas Piesk <apiesk@virbus.de>
     Patch to make chronyc use the readline library if available
 
 Timo Teras <timo.teras@iki.fi>
     Patch to reply correctly on multihomed hosts
 
+Stephen Wadeley <swadeley@redhat.com>
+    Improvements to man pages
+
 Wolfgang Weisselberg <weissel@netcologne.de>
     Entries in contrib directory
 

addrfilt.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997,1998,1999,2000,2001,2002,2005
- * Copyright (C) Miroslav Lichvar  2009
+ * Copyright (C) Miroslav Lichvar  2009, 2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -62,7 +62,7 @@ split_ip6(IPAddr *ip, uint32_t *dst)
   int i;
 
   for (i = 0; i < 4; i++)
-    dst[i] = ip->addr.in6[i * 4 + 0] << 24 |
+    dst[i] = (uint32_t)ip->addr.in6[i * 4 + 0] << 24 |
              ip->addr.in6[i * 4 + 1] << 16 |
              ip->addr.in6[i * 4 + 2] << 8 |
              ip->addr.in6[i * 4 + 3];
@@ -401,117 +401,3 @@ ADF_IsAnyAllowed(ADF_AuthTable table, int family)
       return 0;
   }
 }
-
-/* ================================================== */
-
-#if defined TEST
-
-static void print_node(TableNode *node, uint32_t *addr, int ip_len, int shift, int subnet_bits)
-{
-  uint32_t new_addr[4];
-  int i;
-  TableNode *sub_node;
-
-  for (i=0; i<subnet_bits; i++) putchar(' ');
-
-  if (ip_len == 1)
-      printf("%d.%d.%d.%d",
-          ((addr[0] >> 24) & 255),
-          ((addr[0] >> 16) & 255),
-          ((addr[0] >>  8) & 255),
-          ((addr[0]      ) & 255));
-  else {
-    for (i=0; i<4; i++) {
-      if (addr[i])
-        printf("%d.%d.%d.%d",
-            ((addr[i] >> 24) & 255),
-            ((addr[i] >> 16) & 255),
-            ((addr[i] >>  8) & 255),
-            ((addr[i]      ) & 255));
-      putchar(i < 3 ? ':' : '\0');
-    }
-  }
-  printf("/%d : %s\n",
-         subnet_bits,
-         (node->state == ALLOW) ? "allow" :
-         (node->state == DENY)  ? "deny" : "as parent");
-  if (node->extended) {
-    for (i=0; i<16; i++) {
-      sub_node = &(node->extended[i]);
-      new_addr[0] = addr[0];
-      new_addr[1] = addr[1];
-      new_addr[2] = addr[2];
-      new_addr[3] = addr[3];
-      new_addr[ip_len - 1 - shift / 32] |= ((uint32_t)i << (shift % 32));
-      print_node(sub_node, new_addr, ip_len, shift - 4, subnet_bits + 4);
-    }
-  }
-}
-
-
-static void print_table(ADF_AuthTable table)
-{
-  uint32_t addr[4];
-
-  memset(addr, 0, sizeof (addr));
-  printf("IPv4 table:\n");
-  print_node(&table->base4, addr, 1, 28, 0);
-
-  memset(addr, 0, sizeof (addr));
-  printf("IPv6 table:\n");
-  print_node(&table->base6, addr, 4, 124, 0);
-}
-
-/* ================================================== */
-
-int main (int argc, char **argv)
-{
-  IPAddr ip;
-  ADF_AuthTable table;
-  table = ADF_CreateTable();
-
-  ip.family = IPADDR_INET4;
-
-  ip.addr.in4 = 0x7e800000;
-  ADF_Allow(table, &ip, 9);
-  ip.addr.in4 = 0x7ecc0000;
-  ADF_Deny(table, &ip, 14);
-#if 0
-  ip.addr.in4 = 0x7f000001;
-  ADF_Deny(table, &ip, 32);
-  ip.addr.in4 = 0x7f000000;
-  ADF_Allow(table, &ip, 8);
-#endif
-
-  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
-  ip.addr.in4 ^= 1;
-  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
-
-  ip.family = IPADDR_INET6;
-
-  memcpy(ip.addr.in6, "abcdefghijklmnop", 16);
-  ADF_Deny(table, &ip, 66);
-  ADF_Allow(table, &ip, 59);
-
-  memcpy(ip.addr.in6, "xbcdefghijklmnop", 16);
-  ADF_Deny(table, &ip, 128);
-  ip.addr.in6[15] ^= 3;
-  ADF_Allow(table, &ip, 127);
-
-  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
-  ip.addr.in4 ^= 1;
-  printf("allowed: %d\n", ADF_IsAllowed(table, &ip));
-
-  print_table(table);
-
-  ADF_DestroyTable(table);
-  return 0;
-}
-
-
-
-#endif /* defined TEST */
-
-
-
-

array.c

@@ -44,6 +44,8 @@ ARR_CreateInstance(unsigned int elem_size)
 {
   ARR_Instance array;
 
+  assert(elem_size > 0);
+
   array = MallocNew(struct ARR_Instance_Record);
 
   array->data = NULL;
@@ -64,6 +66,9 @@ ARR_DestroyInstance(ARR_Instance array)
 static void
 realloc_array(ARR_Instance array, unsigned int min_size)
 {
+  size_t data_size;
+
+  assert(min_size <= 2 * min_size);
   if (array->allocated >= min_size && array->allocated <= 2 * min_size)
     return;
 
@@ -74,7 +79,10 @@ realloc_array(ARR_Instance array, unsigned int min_size)
     array->allocated = min_size;
   }
 
-  array->data = Realloc(array->data, array->elem_size * array->allocated);
+  data_size = (size_t)array->elem_size * array->allocated;
+  assert(data_size / array->elem_size == array->allocated);
+
+  array->data = Realloc(array->data, data_size);
 }
 
 void *
@@ -89,12 +97,18 @@ void *
 ARR_GetElement(ARR_Instance array, unsigned int index)
 {
   assert(index < array->used);
-  return (void *)((char *)array->data + index * array->elem_size);
+  return (void *)((char *)array->data + (size_t)index * array->elem_size);
 }
 
 void *
 ARR_GetElements(ARR_Instance array)
 {
+  /* Return a non-NULL pointer when the array has zero size */
+  if (!array->data) {
+    assert(!array->used);
+    return array;
+  }
+
   return array->data;
 }
 

candm.h

@@ -31,7 +31,6 @@
 
 #include "sysincl.h"
 #include "addressing.h"
-#include "hash.h"
 
 /* This is the default port to use for CANDM, if no alternative is
    defined */
@@ -89,11 +88,13 @@
 #define REQ_RESELECT 48
 #define REQ_RESELECTDISTANCE 49
 #define REQ_MODIFY_MAKESTEP 50
-#define N_REQUEST_TYPES 51
-
-/* 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
+#define REQ_SMOOTHING 51
+#define REQ_SMOOTHTIME 52
+#define REQ_REFRESH 53
+#define REQ_SERVER_STATS 54
+#define REQ_CLIENT_ACCESSES_BY_INDEX2 55
+#define REQ_LOCAL2 56
+#define N_REQUEST_TYPES 57
 
 /* Structure used to exchange timevals independent on size of time_t */
 typedef struct {
@@ -116,6 +117,10 @@ typedef struct {
    pktlength.c, to get the number of bytes that ought to be
    transmitted for each packet type. */
 
+typedef struct {
+  int32_t EOR;
+} REQ_Null;
+
 typedef struct {
   IPAddr mask;
   IPAddr address;
@@ -207,6 +212,8 @@ typedef struct {
 typedef struct {
   int32_t on_off;
   int32_t stratum;
+  Float distance;
+  int32_t orphan;
   int32_t EOR;
 } REQ_Local;
 
@@ -215,19 +222,11 @@ typedef struct {
   int32_t EOR;
 } REQ_Manual;
 
-typedef struct {
-  int32_t EOR;
-} REQ_N_Sources;
-
 typedef struct {
   int32_t index;
   int32_t EOR;
 } REQ_Source_Data;
 
-typedef struct {
-  int32_t EOR;
-} REQ_Rekey;
-
 typedef struct {
   IPAddr ip;
   int32_t subnet_bits;
@@ -245,6 +244,8 @@ typedef struct {
 #define REQ_ADDSRC_IBURST 0x4
 #define REQ_ADDSRC_PREFER 0x8
 #define REQ_ADDSRC_NOSELECT 0x10
+#define REQ_ADDSRC_TRUST 0x20
+#define REQ_ADDSRC_REQUIRE 0x40
 
 typedef struct {
   IPAddr ip_addr;
@@ -264,10 +265,6 @@ typedef struct {
   int32_t EOR;
 } REQ_Del_Source;
 
-typedef struct {
-  int32_t EOR;
-} REQ_WriteRtc;
-
 typedef struct {
   Float dfreq;
   int32_t EOR;
@@ -279,63 +276,39 @@ typedef struct {
   int32_t EOR;
 } REQ_Doffset;
 
-typedef struct {
-  int32_t EOR;
-} REQ_Tracking;
-
 typedef struct {
   uint32_t index;
   int32_t EOR;
 } REQ_Sourcestats;
 
-typedef struct {
-  int32_t EOR;
-} REQ_RTCReport;
-
-typedef struct {
-  int32_t EOR;
-} REQ_TrimRTC;
-
-typedef struct {
-  int32_t EOR;
-} REQ_CycleLogs;
-
 /* This is based on the response size rather than the
    request size */
 #define MAX_CLIENT_ACCESSES 8
 
 typedef struct {
   uint32_t first_index;
-  uint32_t n_indices;
+  uint32_t n_clients;
   int32_t EOR;
 } REQ_ClientAccessesByIndex;
 
-typedef struct {
-  int32_t EOR;
-} REQ_ManualList;
-
 typedef struct {
   int32_t index;
   int32_t EOR;
 } REQ_ManualDelete;
 
-typedef struct {
-  int32_t EOR;
-} REQ_MakeStep;
-
-typedef struct {
-  int32_t EOR;
-} REQ_Activity;
-
-typedef struct {
-  int32_t EOR;
-} REQ_Reselect;
-
 typedef struct {
   Float distance;
   int32_t EOR;
 } REQ_ReselectDistance;
 
+#define REQ_SMOOTHTIME_RESET 0
+#define REQ_SMOOTHTIME_ACTIVATE 1
+
+typedef struct {
+  int32_t option;
+  int32_t EOR;
+} REQ_SmoothTime;
+
 /* ================================================== */
 
 #define PKT_TYPE_CMD_REQUEST 1
@@ -365,7 +338,15 @@ typedef struct {
 
    Version 6 : added padding to requests to prevent amplification attack,
    changed maximum number of samples in manual list to 16, new commands: modify
-   makestep
+   makestep, smoothing, smoothtime
+
+   Support for authentication was removed later in version 6 of the protocol
+   and commands that required authentication are allowed only locally over Unix
+   domain socket.
+
+   Version 6 (no authentication) : changed format of client accesses by index
+   (using new request/reply types), new flags in NTP source request and report,
+   new commands: refresh, serverstats
  */
 
 #define PROTO_VERSION_NUMBER 6
@@ -379,7 +360,7 @@ typedef struct {
 #define PROTO_VERSION_PADDING 6
 
 /* The maximum length of padding in request packet, currently
-   defined by CLIENT_ACCESSES_BY_INDEX and MANUAL_LIST */
+   defined by MANUAL_LIST */
 #define MAX_PADDING_LENGTH 396
 
 /* ================================================== */
@@ -394,10 +375,11 @@ typedef struct {
                              (count up from zero for same sequence
                              number) */
   uint32_t sequence; /* Client's sequence number */
-  uint32_t utoken; /* Unique token per incarnation of daemon */
-  uint32_t token; /* Command token (to prevent replay attack) */
+  uint32_t pad1;
+  uint32_t pad2;
 
   union {
+    REQ_Null null;
     REQ_Online online;
     REQ_Offline offline;
     REQ_Burst burst;
@@ -415,39 +397,24 @@ typedef struct {
     REQ_Settime settime;
     REQ_Local local;
     REQ_Manual manual;
-    REQ_N_Sources n_sources;
     REQ_Source_Data source_data;
-    REQ_Rekey rekey;
     REQ_Allow_Deny allow_deny;
     REQ_Ac_Check ac_check;
     REQ_NTP_Source ntp_source;
     REQ_Del_Source del_source;
-    REQ_WriteRtc writertc;
     REQ_Dfreq dfreq;
     REQ_Doffset doffset;
-    REQ_Tracking tracking;
     REQ_Sourcestats sourcestats;
-    REQ_RTCReport rtcreport;
-    REQ_TrimRTC trimrtc;
-    REQ_CycleLogs cyclelogs;
     REQ_ClientAccessesByIndex client_accesses_by_index;
-    REQ_ManualList manual_list;
     REQ_ManualDelete manual_delete;
-    REQ_MakeStep make_step;
-    REQ_Activity activity;
-    REQ_Reselect reselect;
     REQ_ReselectDistance reselect_distance;
+    REQ_SmoothTime smoothtime;
   } data; /* Command specific parameters */
 
-  /* The following fields only set the maximum size of the packet.
-     There are no holes between them and the actual data. */
-
-  /* Padding used to prevent traffic amplification */
+  /* Padding used to prevent traffic amplification.  It only defines the
+     maximum size of the packet, there is no hole after the data field. */
   uint8_t padding[MAX_PADDING_LENGTH];
 
-  /* Authentication data */
-  uint8_t auth[MAX_HASH_LENGTH];
-
 } CMD_Request;
 
 /* ================================================== */
@@ -472,7 +439,10 @@ typedef struct {
 #define RPY_CLIENT_ACCESSES_BY_INDEX 10
 #define RPY_MANUAL_LIST 11
 #define RPY_ACTIVITY 12
-#define N_REPLY_TYPES 13
+#define RPY_SMOOTHING 13
+#define RPY_SERVER_STATS 14
+#define RPY_CLIENT_ACCESSES_BY_INDEX2 15
+#define N_REPLY_TYPES 16
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -519,6 +489,8 @@ typedef struct {
 
 #define RPY_SD_FLAG_NOSELECT 0x1
 #define RPY_SD_FLAG_PREFER 0x2
+#define RPY_SD_FLAG_TRUST 0x4
+#define RPY_SD_FLAG_REQUIRE 0x8
 
 typedef struct {
   IPAddr ip_addr;
@@ -586,11 +558,14 @@ typedef struct {
 
 typedef struct {
   IPAddr ip;
-  uint32_t client_hits;
-  uint32_t peer_hits;
-  uint32_t cmd_hits_auth;
-  uint32_t cmd_hits_normal;
-  uint32_t cmd_hits_bad;
+  uint32_t ntp_hits;
+  uint32_t cmd_hits;
+  uint32_t ntp_drops;
+  uint32_t cmd_drops;
+  int8_t ntp_interval;
+  int8_t cmd_interval;
+  int8_t ntp_timeout_interval;
+  int8_t pad;
   uint32_t last_ntp_hit_ago;
   uint32_t last_cmd_hit_ago;
 } RPY_ClientAccesses_Client;
@@ -603,6 +578,15 @@ typedef struct {
   int32_t EOR;
 } RPY_ClientAccessesByIndex;
 
+typedef struct {
+  uint32_t ntp_hits;
+  uint32_t cmd_hits;
+  uint32_t ntp_drops;
+  uint32_t cmd_drops;
+  uint32_t log_drops;
+  int32_t EOR;
+} RPY_ServerStats;
+
 #define MAX_MANUAL_LIST_SAMPLES 16
 
 typedef struct {
@@ -627,6 +611,19 @@ typedef struct {
   int32_t EOR;
 } RPY_Activity;
 
+#define RPY_SMT_FLAG_ACTIVE 0x1
+#define RPY_SMT_FLAG_LEAPONLY 0x2
+
+typedef struct {
+  uint32_t flags;
+  Float offset;
+  Float freq_ppm;
+  Float wander_ppm;
+  Float last_update_ago;
+  Float remaining_time;
+  int32_t EOR;
+} RPY_Smoothing;
+
 typedef struct {
   uint8_t version;
   uint8_t pkt_type;
@@ -639,9 +636,9 @@ typedef struct {
   uint16_t pad2;
   uint16_t pad3;
   uint32_t sequence; /* Echo of client's sequence number */
-  uint32_t utoken; /* Unique token per incarnation of daemon */
-  uint32_t token; /* New command token (only if command was successfully
-                          authenticated) */
+  uint32_t pad4;
+  uint32_t pad5;
+
   union {
     RPY_Null null;
     RPY_N_Sources n_sources;
@@ -651,14 +648,12 @@ typedef struct {
     RPY_Sourcestats sourcestats;
     RPY_Rtc rtc;
     RPY_ClientAccessesByIndex client_accesses_by_index;
+    RPY_ServerStats server_stats;
     RPY_ManualList manual_list;
     RPY_Activity activity;
+    RPY_Smoothing smoothing;
   } data; /* Reply specific parameters */
 
-  /* authentication of the packet, there is no hole after the actual data
-     from the data union, this field only sets the maximum auth size */
-  uint8_t auth[MAX_HASH_LENGTH];
-
 } CMD_Reply;
 
 /* ================================================== */

chrony.1

@@ -1,72 +0,0 @@
-.TH CHRONY 1 "@MAN_DATE@" "chrony @VERSION@" "User's Manual"
-.SH NAME
-chrony \- programs for keeping computer clocks accurate
-
-.SH SYNOPSIS
-\fBchronyc\fR [\fIOPTIONS\fR]
-
-\fBchronyd\fR [\fIOPTIONS\fR]
-
-.SH DESCRIPTION
-\fBchrony\fR is a pair of programs for keeping computer clocks accurate.
-\fIchronyd\fR is a background (daemon) program and \fIchronyc\fR is a
-command-line interface to it. Time reference sources for chronyd can be
-NTP servers, human (via keyboard and \fIchronyc\fR), or the computer's
-real-time clock at boot time (Linux only). chronyd can determine the rate at
-which the computer gains or loses time and compensate for it while no external
-reference is present. Its use of NTP servers can be switched on and off
-(through \fIchronyc\fR) to support computers with dial-up/intermittent access
-to the Internet, and it can also act as an NTP server.
-
-.SH USAGE
-\fIchronyc\fR is a command-line interface program which can be used to
-monitor \fIchronyd\fR's performance and to change various operating
-parameters whilst it is running.
-
-\fIchronyd\fR's main function is to obtain measurements of the true (UTC)
-time from one of several sources, and correct the system clock
-accordingly.  It also works out the rate at which the system clock
-gains or loses time and uses this information to keep it accurate
-between measurements from the reference.
-
-The reference time can be derived from either Network Time Protocol
-(NTP) servers, reference clocks, or wristwatch-and-keyboard (via \fIchronyc\fR).
-The main source of information about the Network Time Protocol is
-\fIhttp://www.ntp.org\fR.
-
-It is designed so that it can work on computers which only have
-intermittent access to reference sources, for example computers which
-use a dial-up account to access the Internet or laptops.  Of course, it
-will work well on computers with permanent connections too.
-
-In addition, on Linux it can monitor the system's real time clock
-performance, so the system can maintain accurate time even across
-reboots.
-
-Typical accuracies available between 2 machines are
-
-On an ethernet LAN : 100-200 microseconds, often much better
-On a V32bis dial-up modem connection : 10's of milliseconds (from one
-session to the next)
-
-With a good reference clock the accuracy can reach one microsecond.
-
-\fIchronyd\fR can also operate as an NTPv4 (RFC 5905) server, peer and
-broadcast server.
-
-.SH "SEE ALSO"
-.BR chronyc(1),
-.BR chrony.conf(5),
-.BR chronyd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
-of "The Missing Man Pages Project".  Please see
-\fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
-
-The complete chrony documentation is supplied in texinfo format.
-

chrony.conf.5.in

@@ -1,69 +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 10 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 in order to allow \fIchronyd\fR to
-replace unreachable or bad servers automatically.  The configuration file could
-in this case look like
-
-.EX
-     pool pool.ntp.org iburst
-     driftfile @CHRONYVARDIR@/drift
-     makestep 10 3
-     rtcsync
-.EE
-
-.SH "SEE ALSO"
-.BR chrony(1),
-.BR chronyc(1),
-.BR chronyd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
-Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
-for details.
-
-The complete chrony documentation is supplied in texinfo format.
-

chronyc.1.in

@@ -1,75 +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 (default 127.0.0.1)
-.TP
-\fB\-p\fR \fIport-number\fR
-specify port-number
-.TP
-\fB\-n\fR
-display raw IP addresses (don't attempt to look up hostnames)
-.TP
-\fB\-4\fR
-resolve hostnames only to IPv4 addresses
-.TP
-\fB\-6\fR
-resolve hostnames only to IPv6 addresses
-.TP
-\fB\-m\fR
-allow multiple commands to be specified on the command line.  Each argument
-will be interpreted as a whole command.
-.TP
-\fB\-f\fR \fIconf-file\fR
-This option can be used to specify an alternate location for the
-configuration file (default \fI@SYSCONFDIR@/chrony.conf\fR). The configuration file is
-needed for the \fB-a\fR option.
-.TP
-\fB\-a\fR
-With this option chronyc will try to authenticate automatically on
-start. It will read the configuration file, read the command key from the
-keyfile and run the authhash and password commands.
-.TP
-\fIcommand\fR
-specify command.  If no command is given, chronyc will read commands
-interactively.
-
-.SH BUGS
-To report bugs, please visit \fIhttp://chrony.tuxfamily.org\fR
-
-.SH "SEE ALSO"
-.BR chronyd(8),
-.BR chrony(1)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
-Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
-for details.
-
-The complete chrony documentation is supplied in texinfo format.

chronyd.8.in

@@ -1,154 +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
-This option will select the SCHED_FIFO real-time scheduler at the specified
-priority (which must be between 0 and 100).  This mode is supported only on
-Linux.
-.TP
-.B \-m
-This option will lock chronyd into RAM so that it will never be paged out.
-This mode is only supported on Linux.
-.TP
-.B \-n
-When run in this mode, the program will not detach itself from the
-terminal.
-.TP
-.B \-d
-When run in this mode, the program will not detach itself from the
-terminal, and all messages will be sent to the terminal instead of
-to syslog.  When \fBchronyd\fR was compiled with debugging support,
-this option can be used twice to print also debugging messages.
-.TP
-\fB\-f\fR \fIconf-file\fR
-This option can be used to specify an alternate location for the
-configuration file (default \fI@SYSCONFDIR@/chrony.conf\fR).
-.TP
-.B \-r
-This option will reload sample histories for each of the servers being used.
-These histories are created by using the \fIdump\fR command in \fIchronyc\fR,
-or by setting the \fIdumponexit\fR directive in the configuration file.  This
-option is useful if you want to stop and restart \fBchronyd\fR briefly for any
-reason, e.g. to install a new version.  However, it only makes sense on
-systems where the kernel can maintain clock compensation whilst not under
-\fBchronyd\fR's control.  The only version where this happens so far is Linux.
-On systems where this is not the case, e.g. Solaris and SunOS the option
-should not be used.
-.TP
-.B \-R
-When this option is used, the \fIinitstepslew\fR directive and the
-\fImakestep\fR directive used with a positive limit will be ignored. This
-option is useful when restarting \fBchronyd\fR and can be used in conjunction
-with the \fB-r\fR option.
-.TP
-.B \-s
-This option will set the system clock from the computer's real-time
-clock.  This is analogous to supplying the \fI-s\fR flag to the
-\fI/sbin/hwclock\fR program during the Linux boot sequence.
-
-Support for real-time clocks is limited at present - the criteria
-are described in the section on the \fIrtcfile\fR directive in the
-documentation supplied with the distribution.
-
-If used in conjunction with the \fB-r\fR flag, \fBchronyd\fR will attempt
-to preserve the old samples after setting the system clock from
-the real time clock (RTC).  This can be used to allow \fBchronyd\fR to
-perform long term averaging of the gain or loss rate across system
-reboots, and is useful for dial-up systems that are shut down when
-not in use.  For this to work well, it relies on \fBchronyd\fR having
-been able to determine accurate statistics for the difference
-between the RTC and system clock last time the computer was on.
-
-If \fBchronyd\fR doesn't support the RTC on your computer or there is no RTC
-installed, the system clock will be set with this option forward to the time of
-the last modification of the drift file (specified by the \fIdriftfile\fR
-directive) to restore the system time at which \fBchronyd\fR was previously
-stopped.
-.TP
-\fB\-u\fR \fIuser\fR
-This option sets the name of the user to which will \fBchronyd\fR switch to
-drop root privileges if compiled with Linux capabilities support (default
-\fB@DEFAULT_USER@\fR).
-.TP
-.B \-q
-When run in this mode, chronyd will set the system clock once
-and exit.  It will not detach from the terminal.
-.TP
-.B \-Q
-This option is similar to \fB\-q\fR, but it will only print the offset and
-not correct the clock.
-.TP
-.B \-v
-This option displays \fBchronyd\fR's version number to the terminal and exits
-.TP
-.B \-4
-Resolve hostnames only to IPv4 addresses and create only IPv4 sockets.
-.TP
-.B \-6
-Resolve hostnames only to IPv6 addresses and create only IPv6 sockets.
-
-.SH FILES
-\fI@SYSCONFDIR@/chrony.conf\fR
-
-.SH BUGS
-To report bugs, please visit \fIhttp://chrony.tuxfamily.org/\fR
-
-.SH "SEE ALSO"
-\fBchronyd\fR is documented in detail in the documentation supplied with the
-distribution (\fIchrony.txt\fR and \fIchrony.texi\fR).
-
-.BR chrony(1),
-.BR chronyc(1),
-.BR chrony.conf(5),
-.BR hwclock(8),
-.BR ntpd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
-of "The Missing Man Pages Project".  Please see
-\fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
-
-The complete chrony documentation is supplied in texinfo format.
-

clientlog.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009
+ * Copyright (C) Miroslav Lichvar  2009, 2015-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -34,6 +34,8 @@
 #include "config.h"
 
 #include "sysincl.h"
+
+#include "array.h"
 #include "clientlog.h"
 #include "conf.h"
 #include "memory.h"
@@ -41,110 +43,240 @@
 #include "util.h"
 #include "logging.h"
 
-/* Number of bits of address per layer of the table.  This value has
-   been chosen on the basis that a server will predominantly be serving
-   a lot of hosts in a few subnets, rather than a few hosts scattered
-   across many subnets. */
-
-#define NBITS 8
-
-/* Number of entries in each subtable */
-#define TABLE_SIZE (1UL<<NBITS)
-
-typedef struct _Node {
+typedef struct {
   IPAddr ip_addr;
-  unsigned long client_hits;
-  unsigned long peer_hits;
-  unsigned long cmd_hits_bad;
-  unsigned long cmd_hits_normal;
-  unsigned long cmd_hits_auth;
-  time_t last_ntp_hit;
-  time_t last_cmd_hit;
-} Node;
+  uint32_t last_ntp_hit;
+  uint32_t last_cmd_hit;
+  uint32_t ntp_hits;
+  uint32_t cmd_hits;
+  uint16_t ntp_drops;
+  uint16_t cmd_drops;
+  uint16_t ntp_tokens;
+  uint16_t cmd_tokens;
+  int8_t ntp_rate;
+  int8_t cmd_rate;
+  int8_t ntp_timeout_rate;
+  uint8_t flags;
+} Record;
 
-typedef struct _Subnet {
-  void *entry[TABLE_SIZE];
-} Subnet;
+/* Hash table of records, there is a fixed number of records per slot */
+static ARR_Instance records;
 
-/* ================================================== */
+#define SLOT_BITS 4
 
-/* Table for the IPv4 class A subnet */
-static Subnet top_subnet4;
-/* Table for IPv6 */
-static Subnet top_subnet6;
+/* Number of records in one slot of the hash table */
+#define SLOT_SIZE (1U << SLOT_BITS)
 
-/* Table containing pointers directly to all nodes that have been
-   allocated. */
-static Node **nodes = NULL;
+/* Minimum number of slots */
+#define MIN_SLOTS 1
 
-/* Number of nodes actually in the table. */
-static int n_nodes = 0;
+/* Maximum number of slots, this is a hard limit */
+#define MAX_SLOTS (1U << (24 - SLOT_BITS))
 
-/* Number of entries for which the table has been sized. */
-static int max_nodes = 0;
+/* Number of slots in the hash table */
+static unsigned int slots;
+
+/* Maximum number of slots given memory allocation limit */
+static unsigned int max_slots;
+
+/* Times of last hits are saved as 32-bit fixed point values */
+#define TS_FRAC 4
+#define INVALID_TS 0
+
+/* Request rates are saved in the record as 8-bit scaled log2 values */
+#define RATE_SCALE 4
+#define MIN_RATE (-14 * RATE_SCALE)
+#define INVALID_RATE -128
+
+/* Response rates are controlled by token buckets.  The capacity and
+   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 MAX_LIMIT_INTERVAL 12
+#define MIN_LIMIT_BURST 1
+#define MAX_LIMIT_BURST 255
+
+static uint16_t max_ntp_tokens;
+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 */
+static int ntp_token_shift;
+static int cmd_token_shift;
+
+/* Rates at which responses are randomly allowed (in log2) when the
+   buckets don't have enough tokens.  This is necessary in order to
+   prevent an attacker sending requests with spoofed source address
+   from blocking responses to the address completely. */
+
+#define MIN_LEAK_RATE 1
+#define MAX_LEAK_RATE 4
+
+static int ntp_leak_rate;
+static int cmd_leak_rate;
+
+/* Flag indicating whether the last response was dropped */
+#define FLAG_NTP_DROPPED 0x1
 
 /* Flag indicating whether facility is turned on or not */
-static int active = 0;
+static int active;
 
-/* Flag indicating whether memory allocation limit has been reached
-   and no new nodes or subnets should be allocated */
-static int alloc_limit_reached;
-
-static unsigned long alloc_limit;
-static unsigned long alloced;
+/* Global statistics */
+static uint32_t total_ntp_hits;
+static uint32_t total_cmd_hits;
+static uint32_t total_ntp_drops;
+static uint32_t total_cmd_drops;
+static uint32_t total_record_drops;
 
 /* ================================================== */
 
-static void
-split_ip6(IPAddr *ip, uint32_t *dst)
-{
-  int i;
+static int expand_hashtable(void);
 
-  for (i = 0; i < 4; i++)
-    dst[i] = ip->addr.in6[i * 4 + 0] << 24 |
-             ip->addr.in6[i * 4 + 1] << 16 |
-             ip->addr.in6[i * 4 + 2] << 8 |
-             ip->addr.in6[i * 4 + 3];
+/* ================================================== */
+
+static int
+compare_ts(uint32_t x, uint32_t y)
+{
+  if (x == y)
+    return 0;
+  if (y == INVALID_TS)
+    return 1;
+  return (int32_t)(x - y) > 0 ? 1 : -1;
 }
 
 /* ================================================== */
 
-inline static uint32_t
-get_subnet(uint32_t *addr, unsigned int where)
+static Record *
+get_record(IPAddr *ip)
 {
-  int off;
+  unsigned int first, i;
+  time_t last_hit, oldest_hit = 0;
+  Record *record, *oldest_record;
 
-  off = where / 32;
-  where %= 32;
+  if (ip->family != IPADDR_INET4 && ip->family != IPADDR_INET6)
+    return NULL;
 
-  return (addr[off] >> (32 - NBITS - where)) & ((1UL << NBITS) - 1);
-}
+  while (1) {
+    /* Get index of the first record in the slot */
+    first = UTI_IPToHash(ip) % slots * SLOT_SIZE;
 
-/* ================================================== */
+    for (i = 0, oldest_record = NULL; i < SLOT_SIZE; i++) {
+      record = ARR_GetElement(records, first + i);
 
+      if (!UTI_CompareIPs(ip, &record->ip_addr, NULL))
+        return record;
 
-static void
-clear_subnet(Subnet *subnet)
-{
-  int i;
+      if (record->ip_addr.family == IPADDR_UNSPEC)
+        break;
 
-  for (i=0; i<TABLE_SIZE; i++) {
-    subnet->entry[i] = NULL;
+      last_hit = compare_ts(record->last_ntp_hit, record->last_cmd_hit) > 0 ?
+                 record->last_ntp_hit : record->last_cmd_hit;
+
+      if (!oldest_record || compare_ts(oldest_hit, last_hit) > 0 ||
+          (oldest_hit == last_hit && record->ntp_hits + record->cmd_hits <
+           oldest_record->ntp_hits + oldest_record->cmd_hits)) {
+        oldest_record = record;
+        oldest_hit = last_hit;
+      }
+    }
+
+    /* If the slot still has an empty record, use it */
+    if (record->ip_addr.family == IPADDR_UNSPEC)
+      break;
+
+    /* Resize the table if possible and try again as the new slot may
+       have some empty records */
+    if (expand_hashtable())
+      continue;
+
+    /* There is no other option, replace the oldest record */
+    record = oldest_record;
+    total_record_drops++;
+    break;
   }
+
+  record->ip_addr = *ip;
+  record->last_ntp_hit = record->last_cmd_hit = INVALID_TS;
+  record->ntp_hits = record->cmd_hits = 0;
+  record->ntp_drops = record->cmd_drops = 0;
+  record->ntp_tokens = max_ntp_tokens;
+  record->cmd_tokens = max_cmd_tokens;
+  record->ntp_rate = record->cmd_rate = INVALID_RATE;
+  record->ntp_timeout_rate = INVALID_RATE;
+  record->flags = 0;
+
+  return record;
+}
+
+/* ================================================== */
+
+static int
+expand_hashtable(void)
+{
+  ARR_Instance old_records;
+  Record *old_record, *new_record;
+  unsigned int i;
+
+  old_records = records;
+
+  if (2 * slots > max_slots)
+    return 0;
+
+  records = ARR_CreateInstance(sizeof (Record));
+
+  slots = MAX(MIN_SLOTS, 2 * slots);
+  assert(slots <= max_slots);
+
+  ARR_SetSize(records, slots * SLOT_SIZE);
+
+  /* Mark all new records as empty */
+  for (i = 0; i < slots * SLOT_SIZE; i++) {
+    new_record = ARR_GetElement(records, i);
+    new_record->ip_addr.family = IPADDR_UNSPEC;
+  }
+
+  if (!old_records)
+    return 1;
+
+  /* Copy old records to the new hash table */
+  for (i = 0; i < ARR_GetSize(old_records); i++) {
+    old_record = ARR_GetElement(old_records, i);
+    if (old_record->ip_addr.family == IPADDR_UNSPEC)
+      continue;
+
+    new_record = get_record(&old_record->ip_addr);
+
+    assert(new_record);
+    *new_record = *old_record;
+  }
+
+  ARR_DestroyInstance(old_records);
+
+  return 1;
 }
 
 /* ================================================== */
 
 static void
-clear_node(Node *node)
+set_bucket_params(int interval, int burst, uint16_t *max_tokens,
+                  uint16_t *tokens_per_packet, int *token_shift)
 {
-  node->client_hits = 0;
-  node->peer_hits = 0;
-  node->cmd_hits_auth = 0;
-  node->cmd_hits_normal = 0;
-  node->cmd_hits_bad = 0;
-  node->last_ntp_hit = (time_t) 0;
-  node->last_cmd_hit = (time_t) 0;
+  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;
+  }
+
+  *tokens_per_packet = 1U << (TS_FRAC + interval - *token_shift);
+  *max_tokens = *tokens_per_packet * burst;
+
+  DEBUG_LOG(LOGF_ClientLog, "Tokens max %d packet %d shift %d",
+            *max_tokens, *tokens_per_packet, *token_shift);
 }
 
 /* ================================================== */
@@ -152,21 +284,42 @@ clear_node(Node *node)
 void
 CLG_Initialise(void)
 {
-  clear_subnet(&top_subnet4);
-  clear_subnet(&top_subnet6);
-  if (CNF_GetNoClientLog()) {
-    active = 0;
-  } else {
-    active = 1;
+  int interval, burst, leak_rate;
+
+  max_ntp_tokens = max_cmd_tokens = 0;
+  ntp_tokens_per_packet = cmd_tokens_per_packet = 0;
+  ntp_token_shift = cmd_token_shift = 0;
+  ntp_leak_rate = cmd_leak_rate = 0;
+
+  if (CNF_GetNTPRateLimit(&interval, &burst, &leak_rate)) {
+    set_bucket_params(interval, burst, &max_ntp_tokens, &ntp_tokens_per_packet,
+                      &ntp_token_shift);
+    ntp_leak_rate = CLAMP(MIN_LEAK_RATE, leak_rate, MAX_LEAK_RATE);
   }
 
-  nodes = NULL;
-  max_nodes = 0;
-  n_nodes = 0;
+  if (CNF_GetCommandRateLimit(&interval, &burst, &leak_rate)) {
+    set_bucket_params(interval, burst, &max_cmd_tokens, &cmd_tokens_per_packet,
+                      &cmd_token_shift);
+    cmd_leak_rate = CLAMP(MIN_LEAK_RATE, leak_rate, MAX_LEAK_RATE);
+  }
 
-  alloced = 0;
-  alloc_limit = CNF_GetClientLogLimit();
-  alloc_limit_reached = 0;
+  active = !CNF_GetNoClientLog();
+  if (!active) {
+    if (ntp_leak_rate || cmd_leak_rate)
+      LOG_FATAL(LOGF_ClientLog, "ratelimit cannot be used with noclientlog");
+    return;
+  }
+
+  /* Calculate the maximum number of slots that can be allocated in the
+     configured memory limit.  Take into account expanding of the hash
+     table where two copies exist at the same time. */
+  max_slots = CNF_GetClientLogLimit() / (sizeof (Record) * SLOT_SIZE * 3 / 2);
+  max_slots = CLAMP(MIN_SLOTS, max_slots, MAX_SLOTS);
+
+  slots = 0;
+  records = NULL;
+
+  expand_hashtable();
 }
 
 /* ================================================== */
@@ -174,226 +327,302 @@ CLG_Initialise(void)
 void
 CLG_Finalise(void)
 {
-  int i;
-  
-  for (i = 0; i < n_nodes; i++)
-    Free(nodes[i]);
-  Free(nodes);
-}
-
-/* ================================================== */
-
-static void check_alloc_limit() {
-  if (alloc_limit_reached)
+  if (!active)
     return;
 
-  if (alloced >= alloc_limit) {
-    LOG(LOGS_WARN, LOGF_ClientLog, "Client log memory limit reached");
-    alloc_limit_reached = 1;
-  }
+  ARR_DestroyInstance(records);
+}
+
+/* ================================================== */
+
+static uint32_t
+get_ts_from_timeval(struct timeval *tv)
+{
+  uint32_t sec = tv->tv_sec, usec = tv->tv_usec;
+
+  return sec << TS_FRAC | (4295U * usec - (usec >> 5)) >> (32 - TS_FRAC);
 }
 
 /* ================================================== */
 
 static void
-create_subnet(Subnet *parent_subnet, int the_entry)
+update_record(struct timeval *now, uint32_t *last_hit, uint32_t *hits,
+              uint16_t *tokens, uint32_t max_tokens, int token_shift, int8_t *rate)
 {
-  parent_subnet->entry[the_entry] = (void *) MallocNew(Subnet);
-  clear_subnet((Subnet *) parent_subnet->entry[the_entry]);
-  alloced += sizeof (Subnet);
-  check_alloc_limit();
-}
+  uint32_t interval, now_ts, prev_hit, new_tokens;
+  int interval2;
 
-/* ================================================== */
+  now_ts = get_ts_from_timeval(now);
 
-static void
-create_node(Subnet *parent_subnet, int the_entry)
-{
-  Node *new_node;
-  new_node = MallocNew(Node);
-  parent_subnet->entry[the_entry] = (void *) new_node;
-  clear_node(new_node);
+  prev_hit = *last_hit;
+  *last_hit = now_ts;
+  (*hits)++;
 
-  alloced += sizeof (Node);
+  interval = now_ts - prev_hit;
 
-  if (n_nodes == max_nodes) {
-    if (nodes) {
-      assert(max_nodes > 0);
-      max_nodes *= 2;
-      nodes = ReallocArray(Node *, max_nodes, nodes);
-    } else {
-      assert(max_nodes == 0);
-      max_nodes = 16;
-      nodes = MallocArray(Node *, max_nodes);
+  if (prev_hit == INVALID_TS || (int32_t)interval < 0)
+    return;
+
+  new_tokens = (now_ts >> token_shift) - (prev_hit >> token_shift);
+  *tokens = MIN(*tokens + new_tokens, max_tokens);
+
+  /* Convert the interval to scaled and rounded log2 */
+  if (interval) {
+    interval += interval >> 1;
+    for (interval2 = -RATE_SCALE * TS_FRAC; interval2 < -MIN_RATE;
+         interval2 += RATE_SCALE) {
+      if (interval <= 1)
+        break;
+      interval >>= 1;
     }
-    alloced += sizeof (Node *) * (max_nodes - n_nodes);
-  }
-  nodes[n_nodes++] = (Node *) new_node;
-  check_alloc_limit();
-}
-
-/* ================================================== */
-/* Recursively seek out the Node entry for a particular address,
-   expanding subnet tables and node entries as we go if necessary. */
-
-static void *
-find_subnet(Subnet *subnet, uint32_t *addr, int addr_len, int bits_consumed)
-{
-  uint32_t this_subnet;
-
-  this_subnet = get_subnet(addr, bits_consumed);
-  bits_consumed += NBITS;
-
-  if (bits_consumed < 32 * addr_len) {
-    if (!subnet->entry[this_subnet]) {
-      if (alloc_limit_reached)
-        return NULL;
-      create_subnet(subnet, this_subnet);
-    }
-    return find_subnet((Subnet *) subnet->entry[this_subnet], addr, addr_len, bits_consumed);
   } else {
-    if (!subnet->entry[this_subnet]) {
-      if (alloc_limit_reached)
-        return NULL;
-      create_node(subnet, this_subnet);
-    }
-    return subnet->entry[this_subnet];
+    interval2 = -RATE_SCALE * (TS_FRAC + 1);
   }
-}
 
-/* ================================================== */
-
-void
-CLG_LogNTPClientAccess (IPAddr *client, time_t now)
-{
-  uint32_t ip6[4];
-  Node *node;
-
-  if (active) {
-    switch (client->family) {
-      case IPADDR_INET4:
-        node = (Node *) find_subnet(&top_subnet4, &client->addr.in4, 1, 0);
-        break;
-      case IPADDR_INET6:
-        split_ip6(client, ip6);
-        node = (Node *) find_subnet(&top_subnet6, ip6, 4, 0);
-        break;
-      default:
-        assert(0);
-    }
-
-    if (node == NULL)
-      return;
-
-    node->ip_addr = *client;
-    ++node->client_hits;
-    node->last_ntp_hit = now;
-  }
-}
-
-/* ================================================== */
-
-void
-CLG_LogNTPPeerAccess(IPAddr *client, time_t now)
-{
-  uint32_t ip6[4];
-  Node *node;
-
-  if (active) {
-    switch (client->family) {
-      case IPADDR_INET4:
-        node = (Node *) find_subnet(&top_subnet4, &client->addr.in4, 1, 0);
-        break;
-      case IPADDR_INET6:
-        split_ip6(client, ip6);
-        node = (Node *) find_subnet(&top_subnet6, ip6, 4, 0);
-        break;
-      default:
-        assert(0);
-    }
-
-    if (node == NULL)
-      return;
-
-    node->ip_addr = *client;
-    ++node->peer_hits;
-    node->last_ntp_hit = now;
-  }
-}
-
-/* ================================================== */
-
-void
-CLG_LogCommandAccess(IPAddr *client, CLG_Command_Type type, time_t now)
-{
-  uint32_t ip6[4];
-  Node *node;
-
-  if (active) {
-    switch (client->family) {
-      case IPADDR_INET4:
-        node = (Node *) find_subnet(&top_subnet4, &client->addr.in4, 1, 0);
-        break;
-      case IPADDR_INET6:
-        split_ip6(client, ip6);
-        node = (Node *) find_subnet(&top_subnet6, ip6, 4, 0);
-        break;
-      default:
-        assert(0);
-    }
-
-    if (node == NULL)
-      return;
-
-    node->ip_addr = *client;
-    node->last_cmd_hit = now;
-    switch (type) {
-      case CLG_CMD_AUTH:
-        ++node->cmd_hits_auth;
-        break;
-      case CLG_CMD_NORMAL:
-        ++node->cmd_hits_normal;
-        break;
-      case CLG_CMD_BAD_PKT:
-        ++node->cmd_hits_bad;
-        break;
-      default:
-        assert(0);
-        break;
-    }
-  }
-}
-
-/* ================================================== */
-
-CLG_Status
-CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report,
-                                 time_t now, unsigned long *n_indices)
-{
-  Node *node;
-
-  *n_indices = n_nodes;
-
-  if (!active) {
-    return CLG_INACTIVE;
+  /* Update the rate in a rough approximation of exponential moving average */
+  if (*rate == INVALID_RATE) {
+    *rate = -interval2;
   } else {
-
-    if ((index < 0) || (index >= n_nodes)) {
-      return CLG_INDEXTOOLARGE;
+    if (*rate < -interval2) {
+      (*rate)++;
+    } else if (*rate > -interval2) {
+      if (*rate > RATE_SCALE * 5 / 2 - interval2)
+        *rate = RATE_SCALE * 5 / 2 - interval2;
+      else
+        *rate = (*rate - interval2 - 1) / 2;
     }
-    
-    node = nodes[index];
-    
-    report->ip_addr = node->ip_addr;
-    report->client_hits = node->client_hits;
-    report->peer_hits = node->peer_hits;
-    report->cmd_hits_auth = node->cmd_hits_auth;
-    report->cmd_hits_normal = node->cmd_hits_normal;
-    report->cmd_hits_bad = node->cmd_hits_bad;
-    report->last_ntp_hit_ago = now - node->last_ntp_hit;
-    report->last_cmd_hit_ago = now - node->last_cmd_hit;
-    
-    return CLG_SUCCESS;
+  }
+}
+
+/* ================================================== */
+
+static int
+get_index(Record *record)
+{
+  return record - (Record *)ARR_GetElements(records);
+}
+
+/* ================================================== */
+
+int
+CLG_LogNTPAccess(IPAddr *client, struct timeval *now)
+{
+  Record *record;
+
+  total_ntp_hits++;
+
+  if (!active)
+    return -1;
+
+  record = get_record(client);
+  if (record == NULL)
+    return -1;
+
+  /* Update one of the two rates depending on whether the previous request
+     of the client had a reply or it timed out */
+  update_record(now, &record->last_ntp_hit, &record->ntp_hits,
+                &record->ntp_tokens, max_ntp_tokens, ntp_token_shift,
+                record->flags & FLAG_NTP_DROPPED ?
+                &record->ntp_timeout_rate : &record->ntp_rate);
+
+  DEBUG_LOG(LOGF_ClientLog, "NTP hits %"PRIu32" rate %d trate %d tokens %d",
+            record->ntp_hits, record->ntp_rate, record->ntp_timeout_rate,
+            record->ntp_tokens);
+
+  return get_index(record);
+}
+
+/* ================================================== */
+
+int
+CLG_LogCommandAccess(IPAddr *client, struct timeval *now)
+{
+  Record *record;
+
+  total_cmd_hits++;
+
+  if (!active)
+    return -1;
+
+  record = get_record(client);
+  if (record == NULL)
+    return -1;
+
+  update_record(now, &record->last_cmd_hit, &record->cmd_hits,
+                &record->cmd_tokens, max_cmd_tokens, cmd_token_shift,
+                &record->cmd_rate);
+
+  DEBUG_LOG(LOGF_ClientLog, "Cmd hits %"PRIu32" rate %d tokens %d",
+            record->cmd_hits, record->cmd_rate, record->cmd_tokens);
+
+  return get_index(record);
+}
+
+/* ================================================== */
+
+static int
+limit_response_random(int leak_rate)
+{
+  static uint32_t rnd;
+  static int bits_left = 0;
+  int r;
+
+  if (bits_left < leak_rate) {
+    UTI_GetRandomBytes(&rnd, sizeof (rnd));
+    bits_left = 8 * sizeof (rnd);
   }
 
+  /* Return zero on average once per 2^leak_rate */
+  r = rnd % (1U << leak_rate) ? 1 : 0;
+  rnd >>= leak_rate;
+  bits_left -= leak_rate;
+
+  return r;
+}
+
+/* ================================================== */
+
+int
+CLG_LimitNTPResponseRate(int index)
+{
+  Record *record;
+  int drop;
+
+  if (!ntp_tokens_per_packet)
+    return 0;
+
+  record = ARR_GetElement(records, index);
+  record->flags &= ~FLAG_NTP_DROPPED;
+
+  if (record->ntp_tokens >= ntp_tokens_per_packet) {
+    record->ntp_tokens -= ntp_tokens_per_packet;
+    return 0;
+  }
+
+  drop = limit_response_random(ntp_leak_rate);
+
+  /* Poorly implemented clients may send new requests at even a higher rate
+     when they are not getting replies.  If the request rate seems to be more
+     than twice as much as when replies are sent, give up on rate limiting to
+     reduce the amount of traffic.  Invert the sense of the leak to respond to
+     most of the requests, but still keep the estimated rate updated. */
+  if (record->ntp_timeout_rate != INVALID_RATE &&
+      record->ntp_timeout_rate > record->ntp_rate + RATE_SCALE)
+    drop = !drop;
+
+  if (!drop) {
+    record->ntp_tokens = 0;
+    return 0;
+  }
+
+  record->flags |= FLAG_NTP_DROPPED;
+  record->ntp_drops++;
+  total_ntp_drops++;
+
+  return 1;
+}
+
+/* ================================================== */
+
+int
+CLG_LimitCommandResponseRate(int index)
+{
+  Record *record;
+
+  if (!cmd_tokens_per_packet)
+    return 0;
+
+  record = ARR_GetElement(records, index);
+
+  if (record->cmd_tokens >= cmd_tokens_per_packet) {
+    record->cmd_tokens -= cmd_tokens_per_packet;
+    return 0;
+  }
+
+  if (!limit_response_random(cmd_leak_rate)) {
+    record->cmd_tokens = 0;
+    return 0;
+  }
+
+  record->cmd_drops++;
+  total_cmd_drops++;
+
+  return 1;
+}
+
+/* ================================================== */
+
+extern int
+CLG_GetNumberOfIndices(void)
+{
+  if (!active)
+    return -1;
+
+  return ARR_GetSize(records);
+}
+
+/* ================================================== */
+
+static int get_interval(int rate)
+{
+  if (rate == INVALID_RATE)
+    return 127;
+
+  rate += rate > 0 ? RATE_SCALE / 2 : -RATE_SCALE / 2;
+
+  return rate / -RATE_SCALE;
+}
+
+/* ================================================== */
+
+static uint32_t get_last_ago(uint32_t x, uint32_t y)
+{
+  if (y == INVALID_TS || (int32_t)(x - y) < 0)
+    return -1;
+
+  return (x - y) >> TS_FRAC;
+}
+
+/* ================================================== */
+
+int
+CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timeval *now)
+{
+  Record *record;
+  uint32_t now_ts;
+
+  if (!active || index < 0 || index >= ARR_GetSize(records))
+    return 0;
+
+  record = ARR_GetElement(records, index);
+
+  if (record->ip_addr.family == IPADDR_UNSPEC)
+    return 0;
+
+  now_ts = get_ts_from_timeval(now);
+
+  report->ip_addr = record->ip_addr;
+  report->ntp_hits = record->ntp_hits;
+  report->cmd_hits = record->cmd_hits;
+  report->ntp_drops = record->ntp_drops;
+  report->cmd_drops = record->cmd_drops;
+  report->ntp_interval = get_interval(record->ntp_rate);
+  report->cmd_interval = get_interval(record->cmd_rate);
+  report->ntp_timeout_interval = get_interval(record->ntp_timeout_rate);
+  report->last_ntp_hit_ago = get_last_ago(now_ts, record->last_ntp_hit);
+  report->last_cmd_hit_ago = get_last_ago(now_ts, record->last_cmd_hit);
+
+  return 1;
+}
+
+/* ================================================== */
+
+void
+CLG_GetServerStatsReport(RPT_ServerStatsReport *report)
+{
+  report->ntp_hits = total_ntp_hits;
+  report->cmd_hits = total_cmd_hits;
+  report->ntp_drops = total_ntp_drops;
+  report->cmd_drops = total_cmd_drops;
+  report->log_drops = total_record_drops;
 }

clientlog.h

@@ -33,32 +33,15 @@
 
 extern void CLG_Initialise(void);
 extern void CLG_Finalise(void);
-extern void CLG_LogNTPClientAccess(IPAddr *client, time_t now);
-extern void CLG_LogNTPPeerAccess(IPAddr *client, time_t now);
-
-/* When logging command packets, there are several subtypes */
-
-typedef enum {
-  CLG_CMD_AUTH,                 /* authenticated */
-  CLG_CMD_NORMAL,               /* normal */
-  CLG_CMD_BAD_PKT               /* bad version or packet length */
-} CLG_Command_Type;
-
-extern void CLG_LogCommandAccess(IPAddr *client, CLG_Command_Type type, time_t now);
+extern int CLG_LogNTPAccess(IPAddr *client, struct timeval *now);
+extern int CLG_LogCommandAccess(IPAddr *client, struct timeval *now);
+extern int CLG_LimitNTPResponseRate(int index);
+extern int CLG_LimitCommandResponseRate(int index);
 
 /* And some reporting functions, for use by chronyc. */
-/* TBD */
 
-typedef enum {
-  CLG_SUCCESS,                  /* All is well */
-  CLG_EMPTYSUBNET,              /* No hosts logged in requested subnet */
-  CLG_BADSUBNET,                /* Subnet requested is not 0, 8, 16 or 24 bits */
-  CLG_INACTIVE,                 /* Facility not active */
-  CLG_INDEXTOOLARGE             /* Node index is higher than number of nodes present */
-} CLG_Status;
-
-CLG_Status
-CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report,
-                                 time_t now, unsigned long *n_indices);
+extern int CLG_GetNumberOfIndices(void);
+extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timeval *now);
+extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
 
 #endif /* GOT_CLIENTLOG_H */

cmdmon.h

@@ -33,6 +33,7 @@ extern void CAM_Initialise(int family);
 
 extern void CAM_Finalise(void);
 
+extern void CAM_OpenUnixSocket(void);
 extern int CAM_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all);
 extern int CAM_CheckAccessRestriction(IPAddr *ip_addr);
 

cmdparse.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2013
+ * 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
@@ -63,7 +63,7 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
   src->params.max_sources = SRC_DEFAULT_MAXSOURCES;
   src->params.min_samples = SRC_DEFAULT_MINSAMPLES;
   src->params.max_samples = SRC_DEFAULT_MAXSAMPLES;
-  src->params.sel_option = SRC_SelectNormal;
+  src->params.sel_options = 0;
 
   result = CPS_Success;
   
@@ -165,11 +165,17 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
           }
 
         } else if (!strcasecmp(cmd, "noselect")) {
-          src->params.sel_option = SRC_SelectNoselect;
+          src->params.sel_options |= SRC_SELECT_NOSELECT;
         
         } else if (!strcasecmp(cmd, "prefer")) {
-          src->params.sel_option = SRC_SelectPrefer;
+          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;
@@ -217,6 +223,41 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 
 /* ================================================== */
 
+int
+CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance)
+{
+  int n;
+  char *cmd;
+
+  *stratum = 10;
+  *distance = 1.0;
+  *orphan = 0;
+
+  while (*line) {
+    cmd = line;
+    line = CPS_SplitWord(line);
+
+    if (!strcasecmp(cmd, "stratum")) {
+      if (sscanf(line, "%d%n", stratum, &n) != 1 ||
+          *stratum >= NTP_MAX_STRATUM || *stratum <= 0)
+        return 0;
+    } else if (!strcasecmp(cmd, "orphan")) {
+      *orphan = 1;
+      n = 0;
+    } else if (!strcasecmp(cmd, "distance")) {
+      if (sscanf(line, "%lf%n", distance, &n) != 1)
+        return 0;
+    } else {
+      return 0;
+    }
+
+    line += n;
+  }
+
+  return 1;
+}
+/* ================================================== */
+
 void
 CPS_StatusToString(CPS_Status status, char *dest, int len)
 {

cmdparse.h

@@ -59,6 +59,9 @@ typedef struct {
 /* Parse a command to add an NTP server or peer */
 extern CPS_Status CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
   
+/* Parse a command to enable local reference */
+extern int CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance);
+
 /* Get a string describing error status */
 extern void CPS_StatusToString(CPS_Status status, char *dest, int len);
 

conf.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2014
+ * 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
@@ -47,19 +47,15 @@
 
 static int parse_string(char *line, char **result);
 static int parse_int(char *line, int *result);
-static int parse_uint32(char *, uint32_t *result);
 static int parse_double(char *line, double *result);
 static int parse_null(char *line);
 
-static void parse_allow(char *);
+static void parse_allow_deny(char *line, ARR_Instance restrictions, int allow);
 static void parse_bindacqaddress(char *);
 static void parse_bindaddress(char *);
 static void parse_bindcmdaddress(char *);
 static void parse_broadcast(char *);
 static void parse_clientloglimit(char *);
-static void parse_cmdallow(char *);
-static void parse_cmddeny(char *);
-static void parse_deny(char *);
 static void parse_fallbackdrift(char *);
 static void parse_include(char *);
 static void parse_initstepslew(char *);
@@ -69,30 +65,30 @@ static void parse_log(char *);
 static void parse_mailonchange(char *);
 static void parse_makestep(char *);
 static void parse_maxchange(char *);
-static void parse_peer(char *);
-static void parse_pool(char *);
+static void parse_ratelimit(char *line, int *enabled, int *interval,
+                            int *burst, int *leak);
 static void parse_refclock(char *);
-static void parse_server(char *);
 static void parse_smoothtime(char *);
+static void parse_source(char *line, NTP_Source_Type type, int pool);
 static void parse_tempcomp(char *);
 
 /* ================================================== */
 /* Configuration variables */
 
 static int restarted = 0;
-static int generate_command_key = 0;
 static char *rtc_device;
 static int acquisition_port = -1;
 static int ntp_port = 123;
 static char *keys_file = NULL;
 static char *drift_file = NULL;
 static char *rtc_file = NULL;
-static uint32_t command_key_id;
 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 reselect_distance = 1e-4;
 static double stratum_weight = 1e-3;
 static double combine_limit = 3.0;
@@ -112,6 +108,8 @@ 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 */
@@ -126,7 +124,7 @@ static int enable_manual=0;
 static int rtc_on_utc = 0;
 
 /* Filename used to read the hwclock(8) LOCAL/UTC setting */
-static char *hwclock_file = NULL;
+static char *hwclock_file;
 
 /* Flag set if the RTC should be automatically synchronised by kernel */
 static int rtc_sync = 0;
@@ -151,10 +149,8 @@ static double max_offset;
 static int max_samples = 0; /* no limit */
 static int min_samples = 0;
 
-/* Flag set if we should log to syslog when a time adjustment
-   exceeding the threshold is initiated */
-static int do_log_change = 0;
-static double log_change_threshold = 0.0;
+/* Threshold for a time adjustment to be logged to syslog */
+static double log_change_threshold = 1.0;
 
 static char *mail_user_on_change = NULL;
 static double mail_change_threshold = 0.0;
@@ -182,13 +178,27 @@ static IPAddr bind_acq_address4, bind_acq_address6;
    the loopback address will be used */
 static IPAddr bind_cmd_address4, bind_cmd_address6;
 
+/* Path to the Unix domain command socket. */
+static char *bind_cmd_path;
+
 /* Filename to use for storing pid of running chronyd, to prevent multiple
  * chronyds being started. */
 static char *pidfile;
 
+/* Rate limiting parameters */
+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 cmd_ratelimit_enabled = 0;
+static int cmd_ratelimit_interval = 1;
+static int cmd_ratelimit_burst = 16;
+static int cmd_ratelimit_leak = 2;
+
 /* Smoothing constants */
 static double smooth_max_freq = 0.0; /* in ppm */
 static double smooth_max_wander = 0.0; /* in ppm/s */
+static int smooth_leap_only = 0;
 
 /* Temperature sensor, update interval and compensation coefficients */
 static char *tempcomp_sensor_file = NULL;
@@ -319,8 +329,10 @@ CNF_Initialise(int r)
 
   dumpdir = Strdup(".");
   logdir = Strdup(".");
+  bind_cmd_path = Strdup(DEFAULT_COMMAND_SOCKET);
   pidfile = Strdup("/var/run/chronyd.pid");
   rtc_device = Strdup("/dev/rtc");
+  hwclock_file = Strdup(DEFAULT_HWCLOCK_FILE);
   user = Strdup(DEFAULT_USER);
 }
 
@@ -348,6 +360,7 @@ CNF_Finalise(void)
   Free(keys_file);
   Free(leapsec_tz);
   Free(logdir);
+  Free(bind_cmd_path);
   Free(pidfile);
   Free(rtc_device);
   Free(rtc_file);
@@ -369,10 +382,13 @@ CNF_ReadFile(const char *filename)
 
   in = fopen(filename, "r");
   if (!in) {
-    LOG_FATAL(LOGF_Configure, "Could not open configuration file %s", filename);
+    LOG_FATAL(LOGF_Configure, "Could not open configuration file %s : %s",
+              filename, strerror(errno));
     return;
   }
 
+  DEBUG_LOG(LOGF_Configure, "Reading %s", filename);
+
   for (i = 1; fgets(line, sizeof(line), in); i++) {
     CNF_ParseLine(filename, i, line);
   }
@@ -406,7 +422,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
   if (!strcasecmp(command, "acquisitionport")) {
     parse_int(p, &acquisition_port);
   } else if (!strcasecmp(command, "allow")) {
-    parse_allow(p);
+    parse_allow_deny(p, ntp_restrictions, 1);
   } else if (!strcasecmp(command, "bindacqaddress")) {
     parse_bindacqaddress(p);
   } else if (!strcasecmp(command, "bindaddress")) {
@@ -418,19 +434,20 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "clientloglimit")) {
     parse_clientloglimit(p);
   } else if (!strcasecmp(command, "cmdallow")) {
-    parse_cmdallow(p);
+    parse_allow_deny(p, cmd_restrictions, 1);
   } else if (!strcasecmp(command, "cmddeny")) {
-    parse_cmddeny(p);
+    parse_allow_deny(p, cmd_restrictions, 0);
   } else if (!strcasecmp(command, "cmdport")) {
     parse_int(p, &cmd_port);
+  } else if (!strcasecmp(command, "cmdratelimit")) {
+    parse_ratelimit(p, &cmd_ratelimit_enabled, &cmd_ratelimit_interval,
+                    &cmd_ratelimit_burst, &cmd_ratelimit_leak);
   } else if (!strcasecmp(command, "combinelimit")) {
     parse_double(p, &combine_limit);
-  } else if (!strcasecmp(command, "commandkey")) {
-    parse_uint32(p, &command_key_id);
   } else if (!strcasecmp(command, "corrtimeratio")) {
     parse_double(p, &correction_time_ratio);
   } else if (!strcasecmp(command, "deny")) {
-    parse_deny(p);
+    parse_allow_deny(p, ntp_restrictions, 0);
   } else if (!strcasecmp(command, "driftfile")) {
     parse_string(p, &drift_file);
   } else if (!strcasecmp(command, "dumpdir")) {
@@ -439,8 +456,6 @@ CNF_ParseLine(const char *filename, int number, char *line)
     do_dump_on_exit = parse_null(p);
   } else if (!strcasecmp(command, "fallbackdrift")) {
     parse_fallbackdrift(p);
-  } else if (!strcasecmp(command, "generatecommandkey")) {
-    generate_command_key = parse_null(p);
   } else if (!strcasecmp(command, "hwclockfile")) {
     parse_string(p, &hwclock_file);
   } else if (!strcasecmp(command, "include")) {
@@ -453,10 +468,6 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_leapsecmode(p);
   } else if (!strcasecmp(command, "leapsectz")) {
     parse_string(p, &leapsec_tz);
-  } else if (!strcasecmp(command, "linux_freq_scale")) {
-    LOG(LOGS_WARN, LOGF_Configure, "%s directive is no longer supported", command);
-  } else if (!strcasecmp(command, "linux_hz")) {
-    LOG(LOGS_WARN, LOGF_Configure, "%s directive is no longer supported", command);
   } else if (!strcasecmp(command, "local")) {
     parse_local(p);
   } else if (!strcasecmp(command, "lock_all")) {
@@ -466,7 +477,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "logbanner")) {
     parse_int(p, &log_banner);
   } else if (!strcasecmp(command, "logchange")) {
-    do_log_change = parse_double(p, &log_change_threshold);
+    parse_double(p, &log_change_threshold);
   } else if (!strcasecmp(command, "logdir")) {
     parse_string(p, &logdir);
   } else if (!strcasecmp(command, "mailonchange")) {
@@ -479,6 +490,10 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_maxchange(p);
   } else if (!strcasecmp(command, "maxclockerror")) {
     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, "maxsamples")) {
     parse_int(p, &max_samples);
   } else if (!strcasecmp(command, "maxslewrate")) {
@@ -492,13 +507,16 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "noclientlog")) {
     no_client_log = parse_null(p);
   } else if (!strcasecmp(command, "peer")) {
-    parse_peer(p);
+    parse_source(p, NTP_PEER, 0);
   } else if (!strcasecmp(command, "pidfile")) {
     parse_string(p, &pidfile);
   } else if (!strcasecmp(command, "pool")) {
-    parse_pool(p);
+    parse_source(p, NTP_SERVER, 1);
   } else if (!strcasecmp(command, "port")) {
     parse_int(p, &ntp_port);
+  } else if (!strcasecmp(command, "ratelimit")) {
+    parse_ratelimit(p, &ntp_ratelimit_enabled, &ntp_ratelimit_interval,
+                    &ntp_ratelimit_burst, &ntp_ratelimit_leak);
   } else if (!strcasecmp(command, "refclock")) {
     parse_refclock(p);
   } else if (!strcasecmp(command, "reselectdist")) {
@@ -516,7 +534,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "sched_priority")) {
     parse_int(p, &sched_priority);
   } else if (!strcasecmp(command, "server")) {
-    parse_server(p);
+    parse_source(p, NTP_SERVER, 0);
   } else if (!strcasecmp(command, "smoothtime")) {
     parse_smoothtime(p);
   } else if (!strcasecmp(command, "stratumweight")) {
@@ -525,6 +543,11 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_tempcomp(p);
   } else if (!strcasecmp(command, "user")) {
     parse_string(p, &user);
+  } else if (!strcasecmp(command, "commandkey") ||
+             !strcasecmp(command, "generatecommandkey") ||
+             !strcasecmp(command, "linux_freq_scale") ||
+             !strcasecmp(command, "linux_hz")) {
+    LOG(LOGS_WARN, LOGF_Configure, "%s directive is no longer supported", command);
   } else {
     other_parse_error("Invalid command");
   }
@@ -556,19 +579,6 @@ parse_int(char *line, int *result)
 
 /* ================================================== */
 
-static int
-parse_uint32(char *line, uint32_t *result)
-{
-  check_number_of_args(line, 1);
-  if (sscanf(line, "%"SCNu32, result) != 1) {
-    command_parse_error();
-    return 0;
-  }
-  return 1;
-}
-
-/* ================================================== */
-
 static int
 parse_double(char *line, double *result)
 {
@@ -615,25 +625,30 @@ parse_source(char *line, NTP_Source_Type type, int pool)
 /* ================================================== */
 
 static void
-parse_server(char *line)
+parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak)
 {
-  parse_source(line, NTP_SERVER, 0);
-}
+  int n, val;
+  char *opt;
 
-/* ================================================== */
+  *enabled = 1;
 
-static void
-parse_peer(char *line)
-{
-  parse_source(line, NTP_PEER, 0);
-}
-
-/* ================================================== */
-
-static void
-parse_pool(char *line)
-{
-  parse_source(line, NTP_SERVER, 1);
+  while (*line) {
+    opt = line;
+    line = CPS_SplitWord(line);
+    if (sscanf(line, "%d%n", &val, &n) != 1) {
+      command_parse_error();
+      return;
+    }
+    line += n;
+    if (!strcasecmp(opt, "interval"))
+      *interval = val;
+    else if (!strcasecmp(opt, "burst"))
+      *burst = val;
+    else if (!strcasecmp(opt, "leak"))
+      *leak = val;
+    else
+      command_parse_error();
+  }
 }
 
 /* ================================================== */
@@ -641,12 +656,11 @@ parse_pool(char *line)
 static void
 parse_refclock(char *line)
 {
-  int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples;
+  int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
   uint32_t ref_id, lock_ref_id;
   double offset, delay, precision, max_dispersion;
   char *p, *cmd, *name, *param;
   unsigned char ref[5];
-  SRC_SelectOption sel_option;
   RefclockParameters *refclock;
 
   poll = 4;
@@ -655,13 +669,13 @@ parse_refclock(char *line)
   pps_rate = 0;
   min_samples = SRC_DEFAULT_MINSAMPLES;
   max_samples = SRC_DEFAULT_MAXSAMPLES;
+  sel_options = 0;
   offset = 0.0;
   delay = 1e-9;
   precision = 0.0;
   max_dispersion = 0.0;
   ref_id = 0;
   lock_ref_id = 0;
-  sel_option = SRC_SelectNormal;
 
   if (!*line) {
     command_parse_error();
@@ -688,11 +702,11 @@ parse_refclock(char *line)
     if (!strcasecmp(cmd, "refid")) {
       if (sscanf(line, "%4s%n", (char *)ref, &n) != 1)
         break;
-      ref_id = ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
+      ref_id = (uint32_t)ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
     } else if (!strcasecmp(cmd, "lock")) {
       if (sscanf(line, "%4s%n", (char *)ref, &n) != 1)
         break;
-      lock_ref_id = ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
+      lock_ref_id = (uint32_t)ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
     } else if (!strcasecmp(cmd, "poll")) {
       if (sscanf(line, "%d%n", &poll, &n) != 1) {
         break;
@@ -728,18 +742,25 @@ parse_refclock(char *line)
         break;
     } else if (!strcasecmp(cmd, "noselect")) {
       n = 0;
-      sel_option = SRC_SelectNoselect;
+      sel_options |= SRC_SELECT_NOSELECT;
     } else if (!strcasecmp(cmd, "prefer")) {
       n = 0;
-      sel_option = SRC_SelectPrefer;
+      sel_options |= SRC_SELECT_PREFER;
+    } else if (!strcasecmp(cmd, "trust")) {
+      n = 0;
+      sel_options |= SRC_SELECT_TRUST;
+    } else if (!strcasecmp(cmd, "require")) {
+      n = 0;
+      sel_options |= SRC_SELECT_REQUIRE;
     } else {
-      break;
+      other_parse_error("Invalid refclock option");
+      return;
     }
     line += n;
   }
 
   if (*line) {
-    other_parse_error("Invalid/unreadable refclock parameter");
+    command_parse_error();
     return;
   }
 
@@ -752,11 +773,11 @@ parse_refclock(char *line)
   refclock->pps_rate = pps_rate;
   refclock->min_samples = min_samples;
   refclock->max_samples = max_samples;
+  refclock->sel_options = sel_options;
   refclock->offset = offset;
   refclock->delay = delay;
   refclock->precision = precision;
   refclock->max_dispersion = max_dispersion;
-  refclock->sel_option = sel_option;
   refclock->ref_id = ref_id;
   refclock->lock_ref_id = lock_ref_id;
 }
@@ -798,13 +819,9 @@ 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;
 }
 
 /* ================================================== */
@@ -867,11 +884,6 @@ parse_clientloglimit(char *line)
   if (sscanf(line, "%lu", &client_log_limit) != 1) {
     command_parse_error();
   }
-
-  if (client_log_limit == 0) {
-    /* unlimited */
-    client_log_limit = (unsigned long)-1;
-  }
 }
 
 /* ================================================== */
@@ -1033,41 +1045,6 @@ parse_allow_deny(char *line, ARR_Instance restrictions, int allow)
   }
 }
   
-
-/* ================================================== */
-
-static void
-parse_allow(char *line)
-{
-  parse_allow_deny(line, ntp_restrictions, 1);
-}
-
-
-/* ================================================== */
-
-static void
-parse_deny(char *line)
-{
-  parse_allow_deny(line, ntp_restrictions, 0);
-}
-
-/* ================================================== */
-
-static void
-parse_cmdallow(char *line)
-{
-  parse_allow_deny(line, cmd_restrictions, 1);
-}
-
-
-/* ================================================== */
-
-static void
-parse_cmddeny(char *line)
-{
-  parse_allow_deny(line, cmd_restrictions, 0);
-}
-
 /* ================================================== */
 
 static void
@@ -1112,7 +1089,14 @@ parse_bindcmdaddress(char *line)
   IPAddr ip;
 
   check_number_of_args(line, 1);
-  if (UTI_StringToIP(line, &ip)) {
+
+  /* Address starting with / is for the Unix domain socket */
+  if (line[0] == '/') {
+    parse_string(line, &bind_cmd_path);
+    /* / disables the socket */
+    if (!strcmp(bind_cmd_path, "/"))
+        bind_cmd_path[0] = '\0';
+  } else if (UTI_StringToIP(line, &ip)) {
     if (ip.family == IPADDR_INET4)
       bind_cmd_address4 = ip;
     else if (ip.family == IPADDR_INET6)
@@ -1174,11 +1158,23 @@ parse_broadcast(char *line)
 static void
 parse_smoothtime(char *line)
 {
-  check_number_of_args(line, 2);
+  if (get_number_of_args(line) != 3)
+    check_number_of_args(line, 2);
+
   if (sscanf(line, "%lf %lf", &smooth_max_freq, &smooth_max_wander) != 2) {
     smooth_max_freq = 0.0;
     command_parse_error();
   }
+
+  line = CPS_SplitWord(CPS_SplitWord(line));
+  smooth_leap_only = 0;
+
+  if (*line) {
+    if (!strcasecmp(line, "leaponly"))
+      smooth_leap_only = 1;
+    else
+      command_parse_error();
+  }
 }
 
 /* ================================================== */
@@ -1227,8 +1223,47 @@ parse_tempcomp(char *line)
 static void
 parse_include(char *line)
 {
+  glob_t gl;
+  size_t i;
+
   check_number_of_args(line, 1);
-  CNF_ReadFile(line);
+
+  if (glob(line, 0, NULL, &gl)) {
+    DEBUG_LOG(LOGF_Configure, "glob of %s failed", line);
+    return;
+  }
+
+  for (i = 0; i < gl.gl_pathc; i++)
+    CNF_ReadFile(gl.gl_pathv[i]);
+
+  globfree(&gl);
+}
+
+/* ================================================== */
+
+void
+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);
+    UTI_CreateDirAndParents(dir, 0770, uid, gid);
+
+    /* Check the permissions and owner/group in case the directory already
+       existed.  It MUST NOT be accessible by others as permissions on Unix
+       domain sockets are ignored on some systems (e.g. Solaris). */
+    if (!UTI_CheckDirPermissions(dir, 0770, uid, gid)) {
+      LOG(LOGS_WARN, LOGF_Configure, "Disabled command socket %s", bind_cmd_path);
+      bind_cmd_path[0] = '\0';
+    }
+
+    Free(dir);
+  }
 }
 
 /* ================================================== */
@@ -1436,22 +1471,6 @@ CNF_GetRtcDevice(void)
 
 /* ================================================== */
 
-uint32_t
-CNF_GetCommandKey(void)
-{
-  return command_key_id;
-}
-
-/* ================================================== */
-
-int
-CNF_GetGenerateCommandKey(void)
-{
-  return generate_command_key;
-}
-
-/* ================================================== */
-
 int
 CNF_GetDumpOnExit(void)
 {
@@ -1468,6 +1487,14 @@ CNF_GetMaxUpdateSkew(void)
 
 /* ================================================== */
 
+double
+CNF_GetMaxDrift(void)
+{
+  return max_drift;
+}
+
+/* ================================================== */
+
 double
 CNF_GetMaxClockError(void)
 {
@@ -1492,6 +1519,14 @@ CNF_GetMaxSlewRate(void)
 
 /* ================================================== */
 
+double
+CNF_GetMaxDistance(void)
+{
+  return max_distance;
+}
+
+/* ================================================== */
+
 double
 CNF_GetReselectDistance(void)
 {
@@ -1532,10 +1567,12 @@ 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;
@@ -1579,11 +1616,10 @@ CNF_GetMaxChange(int *delay, int *ignore, double *offset)
 
 /* ================================================== */
 
-void
-CNF_GetLogChange(int *enabled, double *threshold)
+double
+CNF_GetLogChange(void)
 {
-  *enabled = do_log_change;
-  *threshold = log_change_threshold;
+  return log_change_threshold;
 }
 
 /* ================================================== */
@@ -1684,6 +1720,14 @@ CNF_GetBindAcquisitionAddress(int family, IPAddr *addr)
 
 /* ================================================== */
 
+char *
+CNF_GetBindCommandPath(void)
+{
+  return bind_cmd_path;
+}
+
+/* ================================================== */
+
 void
 CNF_GetBindCommandAddress(int family, IPAddr *addr)
 {
@@ -1737,11 +1781,32 @@ CNF_GetLockMemory(void)
 
 /* ================================================== */
 
+int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak)
+{
+  *interval = ntp_ratelimit_interval;
+  *burst = ntp_ratelimit_burst;
+  *leak = ntp_ratelimit_leak;
+  return ntp_ratelimit_enabled;
+}
+
+/* ================================================== */
+
+int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak)
+{
+  *interval = cmd_ratelimit_interval;
+  *burst = cmd_ratelimit_burst;
+  *leak = cmd_ratelimit_leak;
+  return cmd_ratelimit_enabled;
+}
+
+/* ================================================== */
+
 void
-CNF_GetSmooth(double *max_freq, double *max_wander)
+CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only)
 {
   *max_freq = smooth_max_freq;
   *max_wander = smooth_max_wander;
+  *leap_only = smooth_leap_only;
 }
 
 /* ================================================== */

conf.h

@@ -39,6 +39,8 @@ extern char *CNF_GetRtcDevice(void);
 extern void CNF_ReadFile(const char *filename);
 extern void CNF_ParseLine(const char *filename, int number, char *line);
 
+extern void CNF_CreateDirs(uid_t uid, gid_t gid);
+
 extern void CNF_AddInitSources(void);
 extern void CNF_AddSources(void);
 extern void CNF_AddBroadcasts(void);
@@ -58,8 +60,6 @@ extern int CNF_GetLogRefclocks(void);
 extern int CNF_GetLogTempComp(void);
 extern char *CNF_GetKeysFile(void);
 extern char *CNF_GetRtcFile(void);
-extern uint32_t CNF_GetCommandKey(void);
-extern int CNF_GetGenerateCommandKey(void);
 extern int CNF_GetDumpOnExit(void);
 extern int CNF_GetManualEnabled(void);
 extern int CNF_GetCommandPort(void);
@@ -67,7 +67,7 @@ extern int CNF_GetRtcOnUtc(void);
 extern int CNF_GetRtcSync(void);
 extern void CNF_GetMakeStep(int *limit, double *threshold);
 extern void CNF_GetMaxChange(int *delay, int *ignore, double *offset);
-extern void CNF_GetLogChange(int *enabled, double *threshold);
+extern double CNF_GetLogChange(void);
 extern void CNF_GetMailOnChange(int *enabled, double *threshold, char **user);
 extern int CNF_GetNoClientLog(void);
 extern unsigned long CNF_GetClientLogLimit(void);
@@ -75,6 +75,7 @@ extern void CNF_GetFallbackDrifts(int *min, int *max);
 extern void CNF_GetBindAddress(int family, IPAddr *addr);
 extern void CNF_GetBindAcquisitionAddress(int family, IPAddr *addr);
 extern void CNF_GetBindCommandAddress(int family, IPAddr *addr);
+extern char *CNF_GetBindCommandPath(void);
 extern char *CNF_GetPidFile(void);
 extern REF_LeapMode CNF_GetLeapSecMode(void);
 extern char *CNF_GetLeapSecTimezone(void);
@@ -82,21 +83,25 @@ 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_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);
 
 extern int CNF_GetSchedPriority(void);
 extern int CNF_GetLockMemory(void);
 
-extern void CNF_GetSmooth(double *max_freq, double *max_wander);
+extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak);
+extern int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak);
+extern void CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only);
 extern void CNF_GetTempComp(char **file, double *interval, char **point_file, double *T0, double *k0, double *k1, double *k2);
 
 extern char *CNF_GetUser(void);

configure

@@ -4,32 +4,12 @@
 # chronyd/chronyc - Programs for keeping computer clocks accurate.
 #
 # Copyright (C) Richard P. Curnow  1997-2003
-# Copyright (C) Miroslav Lichvar  2009, 2012-2014
+# Copyright (C) Miroslav Lichvar  2009, 2012-2015
 #
 # =======================================================================
 
 # This configure script determines the operating system type and version
 
-if [ "x${CC}" = "x" ]; then
-  MYCC="gcc"
-else
-  MYCC="${CC}"
-fi
-
-if [ "x${CFLAGS}" = "x" ]; then
-  MYCFLAGS="-O2 -g"
-else
-  MYCFLAGS="${CFLAGS}"
-fi
-
-MYCPPFLAGS="${CPPFLAGS}"
-
-if [ "x${MYCC}" = "xgcc" ]; then
-  MYCFLAGS="${MYCFLAGS} -Wmissing-prototypes -Wall"
-fi
-
-MYLDFLAGS="${LDFLAGS}"
-
 # ======================================================================
 # FUNCTIONS
 
@@ -41,7 +21,7 @@ test_code () {
   ldflags=$4
   code=$5
 
-  echo -n "Checking for $name : "
+  printf "%s" "Checking for $name : "
 
   (
     for h in $headers; do
@@ -113,12 +93,16 @@ For better control, use the options below.
   --disable-pps          Disable PPS refclock driver
   --disable-ipv6         Disable IPv6 support
   --disable-rtc          Don't include RTC even on Linux
-  --disable-linuxcaps    Disable libcap (Linux capabilities) support
+  --disable-privdrop     Disable support for dropping root privileges
+  --without-libcap       Don't use libcap even if it is available
+  --enable-scfilter      Enable support for system call filtering
+  --without-seccomp      Don't use seccomp even if it is available
   --disable-asyncdns     Disable asynchronous name resolving
   --disable-forcednsretry Don't retry on permanent DNS error
   --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-sendmail=PATH   Path to sendmail binary [/usr/lib/sendmail]
   --enable-debug         Enable debugging support
 
@@ -127,10 +111,10 @@ 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]
   --chronyvardir=DIR     location for chrony data [LOCALSTATEDIR/lib/chrony]
 
 Overriding system detection when cross-compiling:
@@ -174,12 +158,12 @@ get_features () {
   ff=1
   for f; do
     if [ "$ff" = "0" ]; then
-      echo -n " "
+      printf " "
     fi
     if grep "define FEAT_$f" config.h > /dev/null; then
-      echo -n "+$f"
+      printf "%s" "+$f"
     else
-      echo -n "-$f"
+      printf "%s" "-$f"
     fi
     ff=0
   done
@@ -213,7 +197,11 @@ try_tomcrypt=1
 feat_rtc=1
 try_rtc=0
 feat_droproot=1
-try_libcap=0
+try_libcap=-1
+try_clockctl=0
+feat_scfilter=0
+try_seccomp=-1
+priv_ops=""
 readline_lib=""
 readline_inc=""
 ncurses_lib=""
@@ -227,6 +215,7 @@ feat_asyncdns=1
 feat_forcednsretry=1
 ntp_era_split=""
 default_user="root"
+default_hwclockfile=""
 mail_program="/usr/lib/sendmail"
 
 for option
@@ -271,9 +260,6 @@ do
     --datarootdir=* )
       SETDATAROOTDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
-    --infodir=* )
-      SETINFODIR=`echo $option | sed -e 's/^.*=//;'`
-    ;;
     --mandir=* )
       SETMANDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -283,6 +269,9 @@ do
     --localstatedir=* )
       SETLOCALSTATEDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
+    --chronysockdir=* )
+      SETCHRONYSOCKDIR=`echo $option | sed -e 's/^.*=//;'`
+    ;;
     --chronyvardir=* )
       SETCHRONYVARDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -307,9 +296,21 @@ do
     --disable-pps)
       feat_pps=0
     ;;
-    --disable-linuxcaps)
+    --disable-privdrop)
       feat_droproot=0
     ;;
+    --without-libcap|--disable-linuxcaps)
+      try_libcap=0
+    ;;
+    --enable-scfilter)
+      feat_scfilter=1
+    ;;
+    --disable-scfilter)
+      feat_scfilter=0
+    ;;
+    --without-seccomp)
+      try_seccomp=0
+    ;;
     --disable-asyncdns)
       feat_asyncdns=0
     ;;
@@ -322,6 +323,9 @@ do
     --with-user=* )
       default_user=`echo $option | sed -e 's/^.*=//;'`
     ;;
+    --with-hwclockfile=* )
+      default_hwclockfile=`echo $option | sed -e 's/^.*=//;'`
+    ;;
     --with-sendmail=* )
       mail_program=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -356,71 +360,61 @@ rm -f config.h config.log
 
 SYSTEM=${OPERATINGSYSTEM}-${MACHINE}
 
-case $SYSTEM in
-    SunOS-sun4* )
-    case $VERSION in
-        4.* )
-            EXTRA_OBJECTS="sys_sunos.o strerror.o"
-            EXTRA_LIBS="-lkvm"
-            add_def SUNOS
-            echo "Configuring for SunOS (" $SYSTEM "version" $VERSION ")"
-        ;;
-        5.* )
-            EXTRA_OBJECTS="sys_solaris.o"
-            EXTRA_LIBS="-lsocket -lnsl -lkvm -lelf"
-            EXTRA_CLI_LIBS="-lsocket -lnsl"
-            add_def SOLARIS
-            echo "Configuring for Solaris (" $SYSTEM "SunOS version" $VERSION ")"
-        ;;
-    esac
-    ;;
-    Linux* )
-        EXTRA_OBJECTS="sys_generic.o sys_linux.o wrap_adjtimex.o"
-        try_libcap=1
+case $OPERATINGSYSTEM in
+    Linux)
+        EXTRA_OBJECTS="sys_generic.o sys_linux.o sys_timex.o"
+        [ $try_libcap != "0" ] && try_libcap=1
         try_rtc=1
+        [ $try_seccomp != "0" ] && try_seccomp=1
         try_setsched=1
         try_lockmem=1
         try_phc=1
         add_def LINUX
         echo "Configuring for " $SYSTEM
-        if [ "${MACHINE}" = "alpha" ]; then
-           echo "Enabling -mieee"
-           # FIXME: Should really test for GCC
-           MYCFLAGS="$MYCFLAGS -mieee"
+    ;;
+    FreeBSD)
+        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o"
+        add_def FREEBSD
+        if [ $feat_droproot = "1" ]; then
+          add_def FEAT_PRIVDROP
+          priv_ops="ADJUSTTIME ADJUSTTIMEX SETTIME BINDSOCKET"
         fi
-    ;;
-
-    BSD/386-i[3456]86|FreeBSD-i386|FreeBSD-amd64 )
-        # Antti Jrvinen <costello@iki.fi> reported that this system can
-        # be supported with the SunOS 4.x driver files.
-        EXTRA_OBJECTS="sys_sunos.o strerror.o"
-        EXTRA_LIBS="-lkvm"
-        add_def SUNOS
-        echo "Configuring for $SYSTEM (using SunOS driver)"
-    ;;
-    NetBSD-* )
-        EXTRA_OBJECTS="sys_netbsd.o"
-        EXTRA_LIBS="-lkvm"
-        SYSDEFS=""
         echo "Configuring for $SYSTEM"
     ;;
-    SunOS-i86pc* )                                          
-        # Doug Woodward <dougw@whistler.com> reported that this configuration
-        # works for Solaris 2.8 / SunOS 5.8 on x86 platforms
-        EXTRA_OBJECTS="sys_solaris.o"                
-        EXTRA_LIBS="-lsocket -lnsl -lkvm -lelf"      
-        EXTRA_CLI_LIBS="-lsocket -lnsl"                              
+    NetBSD)
+        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o"
+        try_clockctl=1
+        add_def NETBSD
+        echo "Configuring for $SYSTEM"
+    ;;
+    Darwin)
+        EXTRA_OBJECTS="sys_macosx.o"
+        EXTRA_LIBS="-lresolv"
+        EXTRA_CLI_LIBS="-lresolv"
+        add_def MACOSX
+        if [ $feat_droproot = "1" ]; then
+          add_def FEAT_PRIVDROP
+          priv_ops="ADJUSTTIME SETTIME BINDSOCKET"
+        fi
+        echo "Configuring for MacOS X (" $SYSTEM "MacOS X version" $VERSION ")"
+    ;;
+    SunOS)
+        EXTRA_OBJECTS="sys_generic.o sys_solaris.o sys_timex.o"
+        EXTRA_LIBS="-lsocket -lnsl -lresolv"
+        EXTRA_CLI_LIBS="-lsocket -lnsl -lresolv"
         add_def SOLARIS
+        # These are needed to have msg_control in struct msghdr
+        add_def __EXTENSIONS__
+        add_def _XOPEN_SOURCE 1
+        add_def _XOPEN_SOURCE_EXTENDED 1
+        if [ $feat_droproot = "1" ]; then
+          add_def FEAT_PRIVDROP
+          priv_ops="ADJUSTTIMEX SETTIME BINDSOCKET"
+        fi
         echo "Configuring for Solaris (" $SYSTEM "SunOS version" $VERSION ")" 
     ;;                                                                        
-    CYGWIN32_NT-i[3456]86 )
-        EXTRA_OBJECTS="sys_winnt.o"
-        EXTRA_LIBS=""
-        add_def WINNT
-        echo "Configuring for Windows NT (Cygwin32)"
-    ;;
     * )
-        echo "Sorry, I don't know how to build this software on your system."
+        echo "error: $SYSTEM is not supported (yet?)"
         exit 1
     ;;
 esac
@@ -453,6 +447,35 @@ if [ $feat_refclock = "1" ]; then
   EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o refclock_shm.o refclock_sock.o"
 fi
 
+MYCC="$CC"
+MYCFLAGS="$CFLAGS"
+MYCPPFLAGS="$CPPFLAGS"
+MYLDFLAGS="$LDFLAGS"
+
+if [ "x$MYCC" = "x" ]; then
+  MYCC=gcc
+  if ! test_code "$MYCC" '' '' '' ''; then
+    MYCC=cc
+    if ! test_code "$MYCC" '' '' '' ''; then
+      echo "error: no C compiler found"
+      exit 1
+    fi
+  fi
+else
+  if ! test_code "$MYCC" '' '' '' ''; then
+    echo "error: C compiler $MYCC cannot create executables"
+    exit 1
+  fi
+fi
+
+if [ "x$MYCFLAGS" = "x" ]; then
+  MYCFLAGS="-O2 -g"
+fi
+
+if [ "x$MYCC" = "xgcc" ]; then
+  MYCFLAGS="$MYCFLAGS -Wmissing-prototypes -Wall"
+fi
+
 if test_code '64-bit time_t' 'time.h' '' '' '
   char x[sizeof(time_t) > 4 ? 1 : -1] = {0};
   return x[0];'
@@ -464,8 +487,8 @@ then
     split_days=0
   else
     split_seconds=`date '+%s'`
-    if [ "x$split_seconds" = "" ]; then
-      echo "Could not get current time, --with-ntp-era option is needed"
+    if [ "x$split_seconds" = "x" ]; then
+      echo "error: could not get current time, --with-ntp-era option is needed"
       exit 1
     fi
     split_days=$((50 * 365))
@@ -494,7 +517,7 @@ else
   if test_code 'math in -lm' 'math.h' '' '-lm' "$MATHCODE"; then
     LIBS="-lm"
   else
-    echo "Can't compile/link a program which uses sqrt(), log(), pow(), bailing out"
+    echo "error: could not compile/link a program which uses sqrt(), log(), pow()"
     exit 1
   fi
 fi
@@ -507,21 +530,28 @@ if test_code '<inttypes.h>' 'inttypes.h' '' '' ''; then
   add_def HAVE_INTTYPES_H
 fi
 
+if test_code 'struct in_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
+  struct in_pktinfo ipi;
+  return sizeof (ipi.ipi_spec_dst.s_addr) + IP_PKTINFO;'
+then
+  add_def HAVE_IN_PKTINFO
+fi
+
 if [ $feat_ipv6 = "1" ] && \
-  test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' '' '
+  test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' "$EXTRA_LIBS" '
     struct sockaddr_in6 n;
     char p[100];
     n.sin6_addr = in6addr_any;
     return !inet_ntop(AF_INET6, &n.sin6_addr.s6_addr, p, sizeof(p));'
 then
   add_def FEAT_IPV6
-  if test_code 'in6_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
-    return sizeof(struct in6_pktinfo);'
+  if test_code 'struct in6_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
+    return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
   then
     add_def HAVE_IN6_PKTINFO
   else
-    if test_code 'in6_pktinfo with _GNU_SOURCE' 'sys/socket.h netinet/in.h' \
-      '-D_GNU_SOURCE' '' 'return sizeof(struct in6_pktinfo);'
+    if test_code 'struct in6_pktinfo with _GNU_SOURCE' 'sys/socket.h netinet/in.h' \
+      '-D_GNU_SOURCE' '' 'return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
     then
       add_def _GNU_SOURCE
       add_def HAVE_IN6_PKTINFO
@@ -529,7 +559,7 @@ then
   fi
 fi
 
-if test_code 'getaddrinfo()' 'sys/types.h sys/socket.h netdb.h' '' '' \
+if test_code 'getaddrinfo()' 'sys/types.h sys/socket.h netdb.h' '' "$EXTRA_LIBS" \
   'return getaddrinfo(0, 0, 0, 0);'
 then
   add_def HAVE_GETADDRINFO
@@ -545,6 +575,10 @@ then
   MYCFLAGS="$MYCFLAGS -pthread"
 fi
 
+if test_code 'arc4random_buf()' 'stdlib.h' '' '' 'arc4random_buf(NULL, 0);'; then
+  add_def HAVE_ARC4RANDOM
+fi
+
 timepps_h=""
 if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
   if test_code '<sys/timepps.h>' 'sys/timepps.h' '' '' ''; then
@@ -579,6 +613,33 @@ then
     EXTRA_LIBS="$EXTRA_LIBS -lcap"
 fi
 
+if [ $feat_droproot = "1" ] && [ $try_clockctl = "1" ] && \
+  test_code '<sys/clockctl.h>' 'sys/clockctl.h' '' '' ''
+then
+  add_def FEAT_PRIVDROP
+  priv_ops="BINDSOCKET"
+fi
+
+if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
+  test_code seccomp 'seccomp.h' '' '-lseccomp' \
+    'seccomp_init(SCMP_ACT_KILL);'
+then
+  add_def FEAT_SCFILTER
+  # NAME2IPADDRESS shouldn't be enabled with other operations as the helper
+  # process works on one request at the time and the async resolver could
+  # block the main thread
+  priv_ops="NAME2IPADDRESS"
+  EXTRA_LIBS="$EXTRA_LIBS -lseccomp"
+fi
+
+if [ "x$priv_ops" != "x" ]; then
+  EXTRA_OBJECTS="$EXTRA_OBJECTS privops.o"
+  add_def PRIVOPS_HELPER
+  for o in $priv_ops; do
+    add_def PRIVOPS_$o
+  done
+fi
+
 if [ $feat_rtc = "1" ] && [ $try_rtc = "1" ] && \
   test_code '<linux/rtc.h>' 'sys/ioctl.h linux/rtc.h' '' '' \
     'ioctl(1, RTC_UIE_ON&RTC_UIE_OFF&RTC_RD_TIME&RTC_SET_TIME, 0&RTC_UF);'
@@ -732,11 +793,6 @@ if [ "x$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
@@ -752,29 +808,38 @@ if [ "x$SETLOCALSTATEDIR" != "x" ]; then
   LOCALSTATEDIR=$SETLOCALSTATEDIR
 fi
 
+CHRONYSOCKDIR=${LOCALSTATEDIR}/run/chrony
+if [ "x$SETCHRONYSOCKDIR" != "x" ]; then
+  CHRONYSOCKDIR=$SETCHRONYSOCKDIR
+fi
+
 CHRONYVARDIR=${LOCALSTATEDIR}/lib/chrony
 if [ "x$SETCHRONYVARDIR" != "x" ]; then
   CHRONYVARDIR=$SETCHRONYVARDIR
 fi
 
 add_def DEFAULT_CONF_FILE "\"$SYSCONFDIR/chrony.conf\""
+add_def DEFAULT_HWCLOCK_FILE "\"$default_hwclockfile\""
 add_def DEFAULT_USER "\"$default_user\""
+add_def DEFAULT_COMMAND_SOCKET "\"$CHRONYSOCKDIR/chronyd.sock\""
 add_def MAIL_PROGRAM "\"$mail_program\""
 
-common_features="`get_features ASYNCDNS IPV6 SECHASH`"
+common_features="`get_features IPV6 DEBUG`"
 chronyc_features="`get_features READLINE`"
-chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP DEBUG`"
+chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SECHASH ASYNCDNS`"
 add_def CHRONYC_FEATURES "\"$chronyc_features $common_features\""
 add_def CHRONYD_FEATURES "\"$chronyd_features $common_features\""
 echo "Features : $chronyd_features $chronyc_features $common_features"
 
 if [ -f version.txt ]; then
-  add_def CHRONY_VERSION "\"`cat version.txt`\""
+  CHRONY_VERSION="`cat version.txt`"
 else
-  add_def CHRONY_VERSION "\"DEVELOPMENT\""
+  CHRONY_VERSION="DEVELOPMENT"
 fi
 
-for f in Makefile chrony.conf.5 chrony.texi chronyc.1 chronyd.8
+add_def CHRONY_VERSION "\"${CHRONY_VERSION}\""
+
+for f in Makefile doc/Makefile test/unit/Makefile
 do
   echo Creating $f
   sed -e "s%@EXTRA_OBJECTS@%${EXTRA_OBJECTS}%;\
@@ -793,10 +858,12 @@ do
           s%@SBINDIR@%${SBINDIR}%;\
           s%@DOCDIR@%${DOCDIR}%;\
           s%@MANDIR@%${MANDIR}%;\
-          s%@INFODIR@%${INFODIR}%;\
           s%@LOCALSTATEDIR@%${LOCALSTATEDIR}%;\
+          s%@CHRONYSOCKDIR@%${CHRONYSOCKDIR}%;\
           s%@CHRONYVARDIR@%${CHRONYVARDIR}%;\
-          s%@DEFAULT_USER@%${default_user}%;"\
+          s%@DEFAULT_HWCLOCK_FILE@%${default_hwclockfile}%;\
+          s%@DEFAULT_USER@%${default_user}%;\
+          s%@CHRONY_VERSION@%${CHRONY_VERSION}%;" \
           < ${f}.in > $f
 done
 

contrib/bryan_christianson_1/README.txt

@@ -0,0 +1,103 @@
+Notes for installing chrony on MacOS X
+Author: Bryan Christianson (bryan@whatroute.net)
+------------------------------------------------
+
+These files are for those admins/users who would prefer to install chrony
+from the source distribution and are intended as guidelines rather than
+being definitive. They can be edited with a plain text editor, such as
+vi, emacs or your favourite IDE (xcode)
+
+It is assumed you are comfortable with installing software from the
+terminal command line and know how to use sudo to acquire root access.
+
+If you are not familiar with the MacOS X command line then
+please consider using ChronyControl from http://whatroute.net/chronycontrol.html
+
+ChronyControl provides a gui wrapper for installing these files and sets the
+necessary permissions on each file.
+
+
+Install the chrony software
+---------------------------
+
+You will need xcode and the commandline additions to build and install chrony.
+These can be obtained from Apple's website via the App Store.
+
+cd to the chrony directory
+./configure
+make
+sudo make install
+
+chrony is now installed in default locations (/usr/local/sbin/chronyd,
+/usr/local/bin/chronyc)
+
+Create a chrony.conf file - see the chrony website for details
+
+The support files here assume the following directives are specified in the
+chrony.conf file
+
+keyfile /etc/chrony.d/chrony.keys
+driftfile /var/db/chrony/chrony.drift
+bindcmdaddress /var/db/chrony/chronyd.sock
+logdir /var/log/chrony
+dumpdir /var/db/chrony
+
+Install this file as /etc/chrony.d/chrony.conf and create
+the directories specified in the above directives if they don't exist.
+You will need root permissions to create the directories.
+
+
+Running chronyd
+---------------
+At this point chronyd *could* be run as a daemon. Apple discourage running
+daemons and their preferred method uses the launchd facility. The
+support files here provide a launchd configuration file for chronyd and also
+a shell script and launchd configuration file to rotate the chronyd logs on a daily basis.
+
+
+Support files
+-------------
+Dates and sizes may differ
+-rw-r--r--  1 yourname  staff  2084  4 Aug 22:54 README.txt
+-rwxr-xr-x  1 yourname  staff   676  4 Aug 21:18 chronylogrotate.sh
+-rw-r--r--  1 yourname  staff   543 18 Jul 20:10 org.tuxfamily.chronyc.plist
+-rw-r--r--  1 yourname  staff   511 19 Jun 18:30 org.tuxfamily.chronyd.plist
+
+If you have used chrony support directories other than those suggested, you
+will need to edit each file and make the appropriate changes.
+
+
+Installing the support files
+----------------------------
+
+1. chronylogrotate.sh
+This is a simple shell script that deletes old log files. Unfortunately because
+of the need to run chronyc, the standard MacOS X logrotation does not work with
+chrony logs.
+
+This script runs on a daily basis under control of launchd and should be
+installed in the /usr/local/bin directory
+
+sudo cp chronylogrotate.sh /usr/local/bin
+sudo chmod +x /usr/local/bin/chronylogrotate.sh
+sudo chown root:wheel /usr/local/bin/chronylogrotate.sh
+
+
+2. org.tuxfamily.chronyc.plist
+This file is the launchd plist that runs logrotation each day. You may
+wish to edit this file to change the time of day at which the rotation
+will run, currently 04:05 am
+
+sudo cp org.tuxfamily.chronyc.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
+
+
+3. org.tuxfamily.chronyd.plist
+This file is the launchd plist that runs chronyd when the Macintosh starts.
+
+sudo cp org.tuxfamily.chronyd.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyd.plist

contrib/bryan_christianson_1/chronylogrotate.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+#  chronyd/chronyc - Programs for keeping computer clocks accurate.
+#
+#  **********************************************************************
+#  * Copyright (C) Bryan Christianson  2015
+#  *
+#  * This program is free software; you can redistribute it and/or modify
+#  * it under the terms of version 2 of the GNU General Public License as
+#  * published by the Free Software Foundation.
+#  *
+#  * This program is distributed in the hope that it will be useful, but
+#  * WITHOUT ANY WARRANTY; without even the implied warranty of
+#  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#  * General Public License for more details.
+#  *
+#  * You should have received a copy of the GNU General Public License along
+#  * with this program; if not, write to the Free Software Foundation, Inc.,
+#  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#  *
+#  **********************************************************************
+
+LOGDIR=/var/log/chrony
+
+rotate () {
+  prefix=$1
+
+  rm -f $prefix.log.10
+
+  for (( count=9; count>= 0; count-- ))
+  do
+    next=$(( $count+1 ))
+    if [ -f $prefix.log.$count ]; then
+      mv $prefix.log.$count $prefix.log.$next
+    fi
+  done
+
+  if [ -f $prefix.log ]; then
+    mv $prefix.log $prefix.log.0
+  fi
+}
+
+if [ ! -e "$LOGDIR" ]; then
+  logger -s "missing directory: $LOGDIR"
+  exit 1
+fi
+
+cd $LOGDIR
+
+rotate measurements
+rotate statistics
+rotate tracking
+
+#
+# signal chronyd via chronyc
+/usr/local/bin/chronyc cyclelogs > /dev/null
+
+exit $?

contrib/bryan_christianson_1/org.tuxfamily.chronyc.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Label</key>
+	<string>org.tuxfamily.logrotate</string>
+	<key>KeepAlive</key>
+	<false/>
+	<key>ProgramArguments</key>
+	<array>
+		<string>/bin/sh</string>
+		<string>/usr/local/bin/chronylogrotate.sh</string>
+	</array>
+	<key>StartCalendarInterval</key>
+	<dict>
+		<key>Minute</key>
+		<integer>5</integer>
+		<key>Hour</key>
+		<integer>4</integer>
+	</dict>
+</dict>
+</plist>

contrib/bryan_christianson_1/org.tuxfamily.chronyd.plist

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Label</key>
+	<string>org.tuxfamily.chronyd</string>
+	<key>Program</key>
+	<string>/usr/local/sbin/chronyd</string>
+	<key>ProgramArguments</key>
+	<array>
+		<string>chronyd</string>
+		<string>-n</string>
+		<string>-f</string>
+		<string>/private/etc/chrony.d/chrony.conf</string>
+	</array>
+	<key>KeepAlive</key>
+	<true/>
+</dict>
+</plist>

doc/Makefile.in

@@ -0,0 +1,72 @@
+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 = $(MAN_FILES:%.man=%.man.in)
+
+SYSCONFDIR = @SYSCONFDIR@
+BINDIR = @BINDIR@
+SBINDIR = @SBINDIR@
+MANDIR = @MANDIR@
+DOCDIR = @DOCDIR@
+CHRONYSOCKDIR = @CHRONYSOCKDIR@
+CHRONYVARDIR = @CHRONYVARDIR@
+CHRONY_VERSION = @CHRONY_VERSION@
+DEFAULT_USER = @DEFAULT_USER@
+DEFAULT_HWCLOCK_FILE = @DEFAULT_HWCLOCK_FILE@
+
+SED_COMMANDS = "s%\@SYSCONFDIR\@%$(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_USER\@%$(DEFAULT_USER)%g;\
+	       s%\@CHRONYSOCKDIR\@%$(CHRONYSOCKDIR)%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 +1,164 @@
+// 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 reload sample histories for each of the servers and refclocks
+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).
+
+*-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 Mac OS X, 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 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.
+
+*-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

@@ -0,0 +1,404 @@
+// This file is part of chrony
+//
+// Copyright (C) Richard P. Curnow  1997-2003
+// Copyright (C) Miroslav Lichvar  2014-2016
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of version 2 of the GNU General Public License as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+= Frequently Asked Questions
+:toc:
+:numbered:
+
+== `chrony` compared to other programs
+
+=== How does `chrony` compare to `ntpd`?
+
+`chronyd` was designed to work well in a wide range of conditions and it can
+usually synchronise the system clock faster and with better time accuracy. It
+doesn't implement some of the less useful NTP modes like broadcast client or
+multicast server/client.
+
+If your computer is connected to the Internet only for few minutes at a time,
+the network connection is often congested, you turn your computer off or
+suspend it frequently, the clock is not very stable (e.g. there are rapid
+changes in the temperature or it's a virtual machine), or you want to use NTP
+on an isolated network with no hardware reference clocks in sight, `chrony`
+will probably work much better for you.
+
+For a more detailed comparison of features and performance, see the
+https://chrony.tuxfamily.org/comparison.html[comparison page] on the `chrony`
+website.
+
+== Configuration issues
+
+=== What is the minimum recommended configuration for an NTP client?
+
+First, the client needs to know which NTP servers it should ask for the current
+time. They are specified by the `server` or `pool` directive. The `pool`
+directive can be used for names that resolve to multiple addresses. For good
+reliability the client should have at least three servers. The `iburst` option
+speeds up the initial synchronisation.
+
+To stabilize the initial synchronisation on the next start, the estimated drift
+of the system clock is saved to a file specified by the `driftfile` directive.
+
+If the system clock can be far from the true time after boot for any reason,
+`chronyd` should be allowed to correct it quickly by stepping instead of
+slewing, which would take a very long time. The `makestep` directive does
+that.
+
+In order to keep the real-time clock (RTC) close to the true time, so the
+system time is reasonably close to the true time when it's 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 Mac
+OS X.
+
+If you want to use public NTP servers from the
+http://www.pool.ntp.org/[pool.ntp.org] project, the minimal _chrony.conf_ file
+could be:
+
+----
+pool pool.ntp.org iburst
+driftfile /var/lib/chrony/drift
+makestep 1 3
+rtcsync
+----
+
+=== How do I make an NTP server from an NTP client?
+
+You need to add an `allow` directive to the _chrony.conf_ file in order to open
+the NTP port and allow `chronyd` to reply to client requests. `allow` with no
+specified subnet allows all IPv4 and IPv6 addresses.
+
+=== I have several computers on a LAN. Should be all clients of an external server?
+
+The best configuration is usually to make one computer the server, with
+the others as clients of it. Add a `local` directive to the server's
+_chrony.conf_ file. This configuration will be better because
+
+* the load on the external connection is less
+* the load on the external NTP server(s) is less
+* if your external connection goes down, the computers on the LAN
+  will maintain a common time with each other.
+
+=== Must I specify servers by IP address if DNS is not available on chronyd start?
+
+No. Starting from version 1.25, `chronyd` will keep trying to resolve
+the names specified by the `server`, `pool`, and `peer` directives in an
+increasing interval until it succeeds. The `online` command can be issued from
+`chronyc` to try to resolve them immediately.
+
+=== How can I make `chronyd` more secure?
+
+If you don't need to serve time to NTP clients or peers, you can add `port 0`
+to the _chrony.conf_ file to completely disable the NTP server functionality
+and prevent NTP requests from reaching `chronyd`. Starting from version 2.0,
+the NTP server port is open only when client access is allowed by the `allow`
+directive or command, an NTP peer is configured, or the `broadcast` directive
+is used.
+
+If you don't need to use `chronyc` remotely, you can add the following
+directives to the configuration file to bind the command sockets to the
+loopback interface. This is done by default since version 2.0.
+
+----
+bindcmdaddress 127.0.0.1
+bindcmdaddress ::1
+----
+
+If you don't need to use `chronyc` at all or you need to run `chronyc` only
+under the root or _chrony_ user (which can access `chronyd` through a Unix
+domain socket since version 2.2), you can disable the internet command sockets
+completely by adding `cmdport 0` to the configuration file.
+
+You can specify an unprivileged user with the `-u` option, or the `user`
+directive in the _chrony.conf_ file, to which `chronyd` will switch after start
+in order to drop root privileges. The configure script has a `--with-user`
+option, which sets the default user. On Linux, `chronyd` needs to be compiled
+with support for the `libcap` library. On other systems, `chronyd` forks into
+two processes. The child process retains root privileges, but can only perform
+a very limited range of privileged system calls on behalf of the parent.
+
+Also, if `chronyd` is compiled with support for the Linux secure computing
+(seccomp) facility, you can enable a system call filter with the `-F` option.
+It will significantly reduce the kernel attack surface and possibly prevent
+kernel exploits from the `chronyd` process if it's compromised. It's
+recommended to enable the filter only when it's known to work on the version of
+the system where `chrony` is installed as the filter needs to allow also system
+calls made from libraries that `chronyd` is using (e.g. libc) and different
+versions or implementations of the libraries may make different system calls.
+If the filter is missing some system call, `chronyd` could be killed even in
+normal operation.
+
+=== How can I improve the accuracy of the system clock with NTP sources?
+
+Select NTP servers that are well synchronised, stable and close to your
+network. It's better to use more than one server, three or four is usually
+recommended as the minimum, so `chronyd` can detect servers that serve false
+time and combine measurements from multiple sources.
+
+There are also useful options which can be set in the `server` directive, they
+are `minpoll`, `maxpoll`, `polltarget`, `maxdelay`, `maxdelayratio` and
+`maxdelaydevratio`.
+
+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
+permission to poll some servers more frequently, setting these options for
+shorter polling intervals may significantly improve the accuracy of the system
+clock.
+
+The optimal polling interval depends mainly on two factors, stability of the
+network latency and stability of the system clock (which mainly depends on the
+temperature sensitivity of the crystal oscillator and the maximum rate of the
+temperature change).
+
+An example of the directive for an NTP server on the Internet that you are
+allowed to poll frequently could be
+
+----
+server foo.example.net minpoll 4 maxpoll 6 polltarget 16
+----
+
+An example using very short polling intervals for a server located in the same
+LAN could be
+
+----
+server ntp.local minpoll 2 maxpoll 4 polltarget 30
+----
+
+The maxdelay options are useful to ignore measurements with 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
+with local NTP server
+
+----
+server ntp.local minpoll 2 maxpoll 4 polltarget 30 maxdelaydevratio 2
+----
+
+=== What happened to the `commandkey` and `generatecommandkey` directives?
+
+They were removed in version 2.2. Authentication is no longer supported in the
+command protocol. Commands that required authentication are now allowed only
+through a Unix domain socket, which is accessible only by the root and _chrony_
+users. If you need to configure `chronyd` remotely or locally without the root
+password, please consider using ssh and/or sudo to run `chronyc` under the root
+or _chrony_ user on the host where `chronyd` is running.
+
+== Computer is not synchronising
+
+This is the most common problem. There are a number of reasons, see the
+following questions.
+
+=== Behind a firewall?
+
+Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it's
+zero, it means `chronyd` did not get any valid responses from the NTP server
+you are trying to use. If there is a firewall between you and the server, the
+packets may be blocked. Try using a tool like `wireshark` or `tcpdump` to see
+if you're getting any responses from the server.
+
+When `chronyd` is receiving responses from the servers, the output of the
+`sources` command issued few minutes after `chronyd` start might look like
+this:
+
+----
+210 Number of sources = 3
+MS Name/IP address         Stratum Poll Reach LastRx Last sample
+===============================================================================
+^* foo.example.net               2   6   377    34   +484us[ -157us] +/-   30ms
+^- bar.example.net               2   6   377    34    +33ms[  +32ms] +/-   47ms
+^+ baz.example.net               3   6   377    35  -1397us[-2033us] +/-   60ms
+----
+
+=== Are NTP servers specified with the `offline` option?
+
+Check that you're using ``chronyc``'s `online` and `offline` commands
+appropriately. 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?
+
+By default, `chronyd` adjusts the clock gradually by slowing it down or
+speeding it up. If the clock is too far from the true time, it will take
+a long time to correct the error. The `System time` value printed by the
+``chronyc``'s `tracking` command is the remaining correction that needs to be
+applied to the system clock.
+
+The `makestep` directive can be used to allow `chronyd` to step the clock. For
+example, if _chrony.conf_ had
+
+----
+makestep 1 3
+----
+
+the clock would be stepped in the first three updates if its offset was larger
+than one second. Normally, it's recommended to allow the step only in the first
+few updates, but in some cases (e.g. a computer without an RTC or virtual
+machine which can be suspended and resumed with an incorrect time) it may be
+necessary to allow the step on any clock update. The example above would change
+to
+
+----
+makestep 1 -1
+----
+
+== Issues with `chronyc`
+
+=== I keep getting the error `506 Cannot talk to daemon`
+
+When accessing `chronyd` remotely, make sure that the _chrony.conf_ file (on
+the computer where `chronyd` is running) has a `cmdallow` entry for the
+computer you are running `chronyc` on and an appropriate `bindcmdaddress`
+directive. This isn't necessary for localhost.
+
+Perhaps `chronyd` is not running. Try using the `ps` command (e.g. on Linux,
+`ps -auxw`) to see if it's running. Or try `netstat -a` and see if the ports
+123/udp and 323/udp are listening. If `chronyd` is not running, you may have a
+problem with the way you are trying to start it (e.g. at boot time).
+
+Perhaps you have a firewall set up in a way that blocks packets on port
+323/udp. You need to amend the firewall configuration in this case.
+
+=== I keep getting the error `501 Not authorised`
+
+Since version 2.2, the `password` command doesn't do anything and `chronyc`
+needs to run locally under the root or _chrony_ user, which are allowed to
+access the ``chronyd``'s Unix domain command socket.
+
+With older versions, you need to authenticate with the `password` command first
+or use the `-a` option to authenticate automatically on start. The
+configuration file needs to specify a file which contains keys (`keyfile`
+directive) and which key in the key file should be used for `chronyc`
+authentication (`commandkey` directive).
+
+=== Why does `chronyc tracking` always print an IPv4 address as reference ID?
+
+The reference ID is a 32-bit value and is always printed in quad-dotted
+notation, even if the reference source doesn't 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.
+
+If you need to get the IP address of the current reference source, use the `-n`
+option to disable resolving of IP addresses and read the second field (printed
+in parentheses) on the `Reference ID` line.
+
+=== Is the `chronyc` / `chronyd` protocol documented anywhere?
+
+Only by the source code. See _cmdmon.c_ (`chronyd` side) and _client.c_
+(`chronyc` side).
+
+== Real-time clock issues
+
+=== What is the real-time clock (RTC)?
+
+This is the clock which keeps the time even when your computer is turned off.
+It is used to 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
+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 tells `chronyd` to
+monitor the rate at which the RTC gains or loses time. When `chronyd` is
+started with the `-s` option on the next boot, it will set the system time from
+the RTC and also compensate for the drift it has measured previously. The
+`rtcautotrim` directive can be used to keep the RTC close to the true time, but
+it's not strictly necessary if its only purpose is to set the system clock when
+`chronyd` is started on boot. See the documentation for details.
+
+=== I want to use ``chronyd``'s RTC support. Must I disable `hwclock`?
+
+The `hwclock` program is often set-up by default in the boot and shutdown
+scripts with many Linux installations. With the kernel RTC synchronisation
+(`rtcsync` directive), the RTC will be set also every 11 minutes as long as the
+system clock is synchronised. If you want to use ``chronyd``'s RTC monitoring
+(`rtcfile` directive), it's important to disable `hwclock` in the shutdown
+procedure. If you don't, it will over-write the RTC with a new value, unknown
+to `chronyd`. At the next reboot, `chronyd` started with the `-s` option will
+compensate this (wrong) time with its estimate of how far the RTC has drifted
+whilst the power was off, giving a meaningless initial system time.
+
+There is no need to remove `hwclock` from the boot process, as long as `chronyd`
+is started after it has run.
+
+=== I just keep getting the `513 RTC driver not running` message
+
+For the real-time clock support to work, you need the following three
+things
+
+* an RTC in your computer
+* a Linux kernel with enabled RTC support
+* an `rtcfile` directive in your _chrony.conf_ file
+
+=== I get `Could not open /dev/rtc, Device or resource busy` in my syslog file
+
+Some other program running on the system may be using the device.
+
+== 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 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
+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 60 0.1
+ExecStart=/usr/bin/chronyc waitsync 600 0.1 0.0 1
 RemainAfterExit=yes
 StandardOutput=null
 

examples/chrony.conf.example1

@@ -5,8 +5,8 @@ pool pool.ntp.org iburst
 driftfile /var/lib/chrony/drift
 
 # In first three updates step the system clock instead of slew
-# if the adjustment is larger than 10 seconds.
-makestep 10 3
+# if the adjustment is larger than 1 second.
+makestep 1.0 3
 
 # Enable kernel synchronization of the real-time clock (RTC).
 rtcsync

examples/chrony.conf.example2

@@ -6,8 +6,8 @@ pool pool.ntp.org iburst
 driftfile /var/lib/chrony/drift
 
 # In first three updates step the system clock instead of slew
-# if the adjustment is larger than 10 seconds.
-makestep 10 3
+# if the adjustment is larger than 1 second.
+makestep 1.0 3
 
 # Enable kernel synchronization of the real-time clock (RTC).
 rtcsync
@@ -18,20 +18,8 @@ rtcsync
 # Serve time even if not synchronized to any NTP server.
 #local stratum 10
 
-# Specify file containing keys for NTP and command authentication.
-keyfile /etc/chrony.keys
-
-# Specify key number for command authentication.
-commandkey 1
-
-# Generate new command key on start if missing.
-generatecommandkey
-
-# Disable logging of client accesses.
-noclientlog
-
-# Send message to syslog when clock adjustment is larger than 0.5 seconds.
-logchange 0.5
+# Specify file containing keys for NTP authentication.
+#keyfile /etc/chrony.keys
 
 # Specify directory for log files.
 logdir /var/log/chrony

examples/chrony.conf.example3

@@ -5,22 +5,6 @@
 # want to enable.  The more obscure options are not included.  Refer
 # to the documentation for these.
 #
-# Copyright 2002 Richard P. Curnow
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of version 2 of the GNU General Public License as
-# published by the Free Software Foundation.
-# 
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License along
-# with this program; if not, write to the Free Software Foundation, Inc.,
-# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-# 
-#
 #######################################################################
 ### COMMENTS
 # Any of the following lines are comments (you have a choice of
@@ -95,24 +79,10 @@
 
 driftfile /var/lib/chrony/drift
 
-# If you want to use the program called chronyc to configure aspects of
-# chronyd's operation once it is running (e.g. tell it the Internet link
-# has gone up or down), you need a password.  This is stored in the
-# following keys file.  (You also need keys to support authenticated NTP
-# exchanges between cooperating machines.)  Again, this option is
-# assumed by default.
+# If you want to enable NTP authentication with symmetric keys, you will need
+# to uncomment the following line and edit the file to set up the keys.
 
-keyfile /etc/chrony.keys
-
-# Tell chronyd which numbered key in the file is used as the password
-# for chronyc. (You can pick any integer up to 2**32-1.  '1' is just a
-# default.  Using another value will _NOT_ increase security.)
-
-commandkey 1
-
-# With this directive a random password will be generated automatically.
-
-generatecommandkey
+! keyfile /etc/chrony.keys
 
 # chronyd can save the measurement history for the servers to files when
 # it it exits.  This is useful in 2 situations:
@@ -142,15 +112,15 @@ generatecommandkey
 #######################################################################
 ### INITIAL CLOCK CORRECTION
 # This option is useful to quickly correct the clock on start if it's
-# off by a large amount.  The value '10' means that if the error is less
-# than 10 seconds, it will be gradually removed by speeding up or
-# slowing down your computer's clock until it is correct.  If the error
-# is above 10 seconds, an immediate time jump will be applied to correct
-# it.  The value '1' means the step is allowed only on the first update
-# of the clock.  Some software can get upset if the system clock jumps
+# off by a large amount.  The value '1.0' means that if the error is less
+# than 1 second, it will be gradually removed by speeding up or slowing
+# down your computer's clock until it is correct.  If the error is above
+# 1 second, an immediate time jump will be applied to correct it.  The
+# value '3' means the step is allowed only in the first three updates of
+# the clock.  Some software can get upset if the system clock jumps
 # (especially backwards), so be careful!
 
-! makestep 10 1
+! makestep 1.0 3
 
 #######################################################################
 ### LOGGING
@@ -221,6 +191,13 @@ generatecommandkey
 
 ! clientloglimit 4194304
 
+# By default, chronyd tries to respond to all valid NTP requests from
+# allowed addresses.  If you want to limit the response rate for NTP
+# clients that are sending requests too frequently, uncomment and edit
+# the following line.
+
+! limitrate interval 3 burst 8
+
 #######################################################################
 ### REPORTING BIG CLOCK CHANGES
 # Perhaps you want to know if chronyd suddenly detects any large error
@@ -247,6 +224,7 @@ generatecommandkey
 
 # By default chronyd binds to the loopback interface.  Uncomment the
 # following lines to allow receiving command packets from remote hosts.
+
 ! bindcmdaddress 0.0.0.0
 ! bindcmdaddress ::
 
@@ -262,10 +240,10 @@ generatecommandkey
 # syntax and meaning is the same as for 'allow' and 'deny', except that
 # 'cmdallow' and 'cmddeny' control access to the chronyd's command port.
 
-# NOTE, even if the host where you run chronyc is granted access, you
-# still need a command key set up and you have to know the password to
-# put into chronyc to allow you to modify chronyd's parameters.  By
-# default all you can do is view information about chronyd's operation.
+# Rate limiting can be enabled also for command packets.  (Note,
+# commands from localhost are never limited.)
+
+! cmdratelimit interval 1 burst 16
 
 #######################################################################
 ### REAL TIME CLOCK

examples/chrony.keys.example

@@ -1,29 +1,12 @@
-#######################################################################
+# This is an example chrony keys file.  It is used for NTP authentication with
+# symmetric keys.  It should be readable only by root or the user to which
+# chronyd is configured to switch to after start.
 #
-# This is an example chrony keys file.  You should copy it to /etc/chrony.keys
-# after editing it to set up the key(s) you want to use.  It should be readable
-# only by root or the user chronyd drops the root privileges to.  In most
-# situations, you will require a single key (the 'commandkey') so that you can
-# supply a password to chronyc to enable you to modify chronyd's operation
-# whilst it is running.
-#
-# Copyright 2002 Richard P. Curnow
-#
-######################################################################
+# Don't use the example keys!  It's recommended to generate random keys using
+# the chronyc keygen command.
 
 # Examples of valid keys:
 
-#1 ALongAndRandomPassword
-#2 MD5 HEX:B028F91EA5C38D06C2E140B26C7F41EC
-#3 SHA1 HEX:1DC764E0791B11FA67EFC7ECBC4B0D73F68A070C
-
-# The keys should be random for maximum security.  If you wanted to use a key
-# with ID 1 as your commandkey (i.e. chronyc password) you would put
-# "commandkey 1" into chrony.conf.  If no commandkey is present in the keys
-# file and the generatecommandkey directive is specified in chrony.conf,
-# a random commandkey will be generated and added to the keys file
-# automatically on chronyd start.
-
-# You might want to define more keys if you use the authentication facility
-# in the network time protocol to authenticate request/response packets between
-# trusted clients and servers.
+#1 MD5 AVeryLongAndRandomPassword
+#2 MD5 HEX:12114855C7931009B4049EF3EFC48A139C3F989F
+#3 SHA1 HEX:B2159C05D6A219673A3B7E896B6DE07F6A440995

examples/chrony.logrotate

@@ -3,6 +3,6 @@
     nocreate
     sharedscripts
     postrotate
-        /usr/bin/chronyc -a cyclelogs > /dev/null 2>&1 || true
+        /usr/bin/chronyc cyclelogs > /dev/null 2>&1 || true
     endscript
 }

examples/chrony.nm-dispatcher

@@ -6,12 +6,12 @@ export LC_ALL=C
 
 if [ "$2" = "up" ]; then
 	/sbin/ip route list dev "$1" | grep -q '^default' &&
-		/usr/bin/chronyc -a online > /dev/null 2>&1
+		/usr/bin/chronyc online > /dev/null 2>&1
 fi
 
 if [ "$2" = "down" ]; then
 	/sbin/ip route list | grep -q '^default' ||
-		/usr/bin/chronyc -a offline > /dev/null 2>&1
+		/usr/bin/chronyc offline > /dev/null 2>&1
 fi
 
 exit 0

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).
@@ -28,30 +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/chrony.1.gz
 %{_mandir}/man1/chronyc.1.gz
 %{_mandir}/man5/chrony.conf.5.gz
 %{_mandir}/man8/chronyd.8.gz
-%doc README
-%doc chrony.txt
-%doc COPYING
+%doc README FAQ NEWS COPYING
 %doc examples/chrony.conf.example*
 %doc examples/chrony.keys.example
 

getdate.y

@@ -8,12 +8,7 @@
 **  This code is in the public domain and has no copyright.
 */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-# ifdef HAVE_ALLOCA_H
-#  include <alloca.h>
-# endif
-#endif
+#include "config.h"
 
 /* Since the code of getdate.y is not included in the Emacs executable
    itself, there is no need to #define static in this file.  Even if

hash_nss.c

@@ -25,11 +25,12 @@
 
   */
 
+#include "config.h"
+
 #include <nss.h>
 #include <hasht.h>
 #include <nsslowhash.h>
 
-/* #include "config.h" */
 #include "hash.h"
 
 static NSSLOWInitContext *ictx;

keys.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2012-2014
+ * Copyright (C) Miroslav Lichvar  2012-2016
  * 
  * 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
@@ -39,6 +39,8 @@
 #include "local.h"
 #include "logging.h"
 
+/* Consider 80 bits as the absolute minimum for a secure key */
+#define MIN_SECURE_KEY_LENGTH 10
 
 typedef struct {
   uint32_t id;
@@ -50,72 +52,12 @@ typedef struct {
 
 static ARR_Instance keys;
 
-static int command_key_valid;
-static uint32_t command_key_id;
 static int cache_valid;
 static uint32_t cache_key_id;
 static int cache_key_pos;
 
 /* ================================================== */
 
-static int
-generate_key(uint32_t key_id)
-{
-#ifdef FEAT_SECHASH
-  unsigned char key[20];
-  const char *hashname = "SHA1";
-#else
-  unsigned char key[16];
-  const char *hashname = "MD5";
-#endif
-  const char *key_file, *rand_dev = "/dev/urandom";
-  FILE *f;
-  struct stat st;
-  int i;
-
-  key_file = CNF_GetKeysFile();
-
-  if (!key_file)
-    return 0;
-
-  f = fopen(rand_dev, "r");
-  if (!f || fread(key, sizeof (key), 1, f) != 1) {
-    if (f)
-      fclose(f);
-    LOG_FATAL(LOGF_Keys, "Could not read %s", rand_dev);
-    return 0;
-  }
-  fclose(f);
-
-  f = fopen(key_file, "a");
-  if (!f) {
-    LOG_FATAL(LOGF_Keys, "Could not open keyfile %s for writing", key_file);
-    return 0;
-  }
-
-  /* Make sure the keyfile is not world-readable */
-  if (stat(key_file, &st) || chmod(key_file, st.st_mode & 0770)) {
-    fclose(f);
-    LOG_FATAL(LOGF_Keys, "Could not change permissions of keyfile %s", key_file);
-    return 0;
-  }
-
-  fprintf(f, "\n%"PRIu32" %s HEX:", key_id, hashname);
-  for (i = 0; i < sizeof (key); i++)
-    fprintf(f, "%02hhX", key[i]);
-  fprintf(f, "\n");
-  fclose(f);
-
-  /* Erase the key from stack */
-  memset(key, 0, sizeof (key));
-
-  LOG(LOGS_INFO, LOGF_Keys, "Generated key %"PRIu32, key_id);
-
-  return 1;
-}
-
-/* ================================================== */
-
 static void
 free_keys(void)
 {
@@ -125,7 +67,6 @@ free_keys(void)
     Free(((Key *)ARR_GetElement(keys, i))->val);
 
   ARR_SetSize(keys, 0);
-  command_key_valid = 0;
   cache_valid = 0;
 }
 
@@ -135,14 +76,8 @@ void
 KEY_Initialise(void)
 {
   keys = ARR_CreateInstance(sizeof (Key));
-  command_key_valid = 0;
   cache_valid = 0;
   KEY_Reload();
-
-  if (CNF_GetGenerateCommandKey() && !KEY_KeyKnown(KEY_GetCommandKey())) {
-    if (generate_key(KEY_GetCommandKey()))
-      KEY_Reload();
-  }
 }
 
 /* ================================================== */
@@ -334,18 +269,6 @@ get_key_by_id(uint32_t key_id)
 
 /* ================================================== */
 
-uint32_t
-KEY_GetCommandKey(void)
-{
-  if (!command_key_valid) {
-    command_key_id = CNF_GetCommandKey();
-  }
-
-  return command_key_id;
-}
-
-/* ================================================== */
-
 int
 KEY_KeyKnown(uint32_t key_id)
 {
@@ -369,6 +292,21 @@ KEY_GetAuthDelay(uint32_t key_id)
 
 /* ================================================== */
 
+int
+KEY_CheckKeyLength(uint32_t key_id)
+{
+  Key *key;
+
+  key = get_key_by_id(key_id);
+
+  if (!key)
+    return 0;
+
+  return key->len >= MIN_SECURE_KEY_LENGTH;
+}
+
+/* ================================================== */
+
 int
 KEY_GenerateAuth(uint32_t key_id, const unsigned char *data, int data_len,
     unsigned char *auth, int auth_len)

keys.h

@@ -34,11 +34,10 @@ extern void KEY_Finalise(void);
 
 extern void KEY_Reload(void);
 
-extern uint32_t KEY_GetCommandKey(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_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);

local.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011, 2014
+ * Copyright (C) Miroslav Lichvar  2011, 2014-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -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;
 
@@ -166,6 +165,11 @@ 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;
 }
 
@@ -406,12 +410,12 @@ 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);
 }
 
 /* ================================================== */
@@ -564,6 +568,9 @@ LCL_NotifyLeap(int leap)
   LCL_ReadRawTime(&raw);
   LCL_CookTime(&raw, &cooked, NULL);
 
+  /* Smooth the leap second out */
+  SMT_Leap(&cooked, leap);
+
   /* Dispatch to all handlers as if the clock was stepped */
   invoke_parameter_change_handlers(&raw, &cooked, 0.0, -leap, LCL_ChangeStep);
 }

logging.c

@@ -31,7 +31,6 @@
 
 #include "conf.h"
 #include "logging.h"
-#include "mkdirpp.h"
 #include "util.h"
 
 /* This is used by DEBUG_LOG macro */
@@ -49,10 +48,6 @@ static int parent_fd = 0;
 #define DEBUG_LEVEL_PRINT_DEBUG 2
 static int debug_level = 0;
 
-#ifdef WINNT
-static FILE *logfile;
-#endif
-
 struct LogFile {
   const char *name;
   const char *banner;
@@ -74,10 +69,6 @@ void
 LOG_Initialise(void)
 {
   initialised = 1;
-
-#ifdef WINNT
-  logfile = fopen("./chronyd.err", "a");
-#endif
 }
 
 /* ================================================== */
@@ -86,15 +77,9 @@ LOG_Initialise(void)
 void
 LOG_Finalise(void)
 {
-#ifdef WINNT
-  if (logfile) {
-    fclose(logfile);
-  }
-#else
   if (system_log) {
     closelog();
   }
-#endif
 
   LOG_CycleLogFiles();
 
@@ -105,11 +90,6 @@ LOG_Finalise(void)
 
 static void log_message(int fatal, LOG_Severity severity, const char *message)
 {
-#ifdef WINNT
-  if (logfile) {
-    fprintf(logfile, fatal ? "Fatal error : %s\n" : "%s\n", message);
-  }
-#else
   if (system_log) {
     int priority;
     switch (severity) {
@@ -135,32 +115,33 @@ static void log_message(int fatal, LOG_Severity severity, const char *message)
   } else {
     fprintf(stderr, fatal ? "Fatal error : %s\n" : "%s\n", message);
   }
-#endif
 }
 
 /* ================================================== */
 
-void LOG_Message(LOG_Severity severity, LOG_Facility facility,
-                 int line_number, const char *filename,
-                 const char *function_name, const char *format, ...)
+void LOG_Message(LOG_Severity severity,
+#if DEBUG > 0
+                 LOG_Facility facility, int line_number,
+                 const char *filename, const char *function_name,
+#endif
+                 const char *format, ...)
 {
   char buf[2048];
   va_list other_args;
   time_t t;
   struct tm stm;
 
-#ifdef WINNT
-#else
   if (!system_log) {
     /* Don't clutter up syslog with timestamps and internal debugging info */
     time(&t);
     stm = *gmtime(&t);
     strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%SZ", &stm);
     fprintf(stderr, "%s ", buf);
+#if DEBUG > 0
     if (debug_level >= DEBUG_LEVEL_PRINT_FUNCTION)
       fprintf(stderr, "%s:%d:(%s) ", filename, line_number, function_name);
-  }
 #endif
+  }
 
   va_start(other_args, format);
   vsnprintf(buf, sizeof(buf), format, other_args);
@@ -198,11 +179,8 @@ void LOG_Message(LOG_Severity severity, LOG_Facility facility,
 void
 LOG_OpenSystemLog(void)
 {
-#ifdef WINNT
-#else
   system_log = 1;
   openlog("chronyd", LOG_PID, LOG_DAEMON);
-#endif
 }
 
 /* ================================================== */
@@ -300,20 +278,6 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
 
 /* ================================================== */
 
-void
-LOG_CreateLogFileDir(void)
-{
-  const char *logdir;
-
-  logdir = CNF_GetLogDir();
-
-  if (!mkdir_and_parents(logdir)) {
-    LOG(LOGS_ERR, LOGF_Logging, "Could not create directory %s", logdir);
-  }
-}
-
-/* ================================================== */
-
 void
 LOG_CycleLogFiles(void)
 {

logging.h

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2002
- * Copyright (C) Miroslav Lichvar  2013-2014
+ * Copyright (C) Miroslav Lichvar  2013-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -45,18 +45,28 @@ extern int log_debug_enabled;
 #define FORMAT_ATTRIBUTE_PRINTF(str, first)
 #endif
 
+#if DEBUG > 0
+#define LOG_MESSAGE(severity, facility, ...) \
+  LOG_Message(severity, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__);
+#else
+#define LOG_MESSAGE(severity, facility, ...) \
+  LOG_Message(severity, __VA_ARGS__);
+#endif
+
 #define DEBUG_LOG(facility, ...) \
   do { \
     if (DEBUG && log_debug_enabled) \
-      LOG_Message(LOGS_DEBUG, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__); \
+      LOG_MESSAGE(LOGS_DEBUG, facility, __VA_ARGS__); \
   } while (0)
-#define LOG(severity, facility, ...) LOG_Message(severity, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__)
+
 #define LOG_FATAL(facility, ...) \
   do { \
-    LOG_Message(LOGS_FATAL, facility, __LINE__, __FILE__, FUNCTION_NAME, __VA_ARGS__); \
+    LOG_MESSAGE(LOGS_FATAL, facility, __VA_ARGS__); \
     exit(1); \
   } while (0)
 
+#define LOG(severity, facility, ...) LOG_MESSAGE(severity, facility, __VA_ARGS__)
+
 /* Definition of severity */
 typedef enum {
   LOGS_INFO,
@@ -81,6 +91,7 @@ typedef enum {
   LOGF_Util,
   LOGF_Main,
   LOGF_Memory,
+  LOGF_Client,
   LOGF_ClientLog,
   LOGF_Configure,
   LOGF_CmdMon,
@@ -89,14 +100,16 @@ typedef enum {
   LOGF_Keys,
   LOGF_Logging,
   LOGF_Nameserv,
+  LOGF_PrivOps,
   LOGF_Rtc,
   LOGF_Regress,
   LOGF_Sys,
   LOGF_SysGeneric,
   LOGF_SysLinux,
+  LOGF_SysMacOSX,
   LOGF_SysNetBSD,
   LOGF_SysSolaris,
-  LOGF_SysSunOS,
+  LOGF_SysTimex,
   LOGF_SysWinnt,
   LOGF_TempComp,
   LOGF_RtcLinux,
@@ -111,10 +124,15 @@ extern void LOG_Initialise(void);
 extern void LOG_Finalise(void);
 
 /* Line logging function */
+#if DEBUG > 0
 FORMAT_ATTRIBUTE_PRINTF(6, 7)
 extern void LOG_Message(LOG_Severity severity, LOG_Facility facility,
                         int line_number, const char *filename,
                         const char *function_name, const char *format, ...);
+#else
+FORMAT_ATTRIBUTE_PRINTF(2, 3)
+extern void LOG_Message(LOG_Severity severity, const char *format, ...);
+#endif
 
 /* Set debug level:
    0, 1 - only non-debug messages are logged
@@ -141,7 +159,6 @@ extern LOG_FileID LOG_FileOpen(const char *name, const char *banner);
 FORMAT_ATTRIBUTE_PRINTF(2, 3)
 extern void LOG_FileWrite(LOG_FileID id, const char *format, ...);
 
-extern void LOG_CreateLogFileDir(void);
 extern void LOG_CycleLogFiles(void);
 
 #endif /* GOT_LOGGING_H */

main.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) John G. Hasler  2009
- * Copyright (C) Miroslav Lichvar  2012-2014
+ * Copyright (C) Miroslav Lichvar  2012-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -49,8 +49,10 @@
 #include "refclock.h"
 #include "clientlog.h"
 #include "nameserv.h"
+#include "privops.h"
 #include "smooth.h"
 #include "tempcomp.h"
+#include "util.h"
 
 /* ================================================== */
 
@@ -67,6 +69,18 @@ static REF_Mode ref_mode = REF_ModeNormal;
 
 /* ================================================== */
 
+static void
+do_platform_checks(void)
+{
+  /* Require at least 32-bit integers, two's complement representation and
+     the usual implementation of conversion of unsigned integers */
+  assert(sizeof (int) >= 4);
+  assert(-1 == ~0);
+  assert((int32_t)4294967295U == (int32_t)-1);
+}
+
+/* ================================================== */
+
 static void
 delete_pidfile(void)
 {
@@ -94,10 +108,10 @@ MAI_CleanupAndExit(void)
   MNL_Finalise();
   CLG_Finalise();
   NSR_Finalise();
-  NCR_Finalise();
-  CAM_Finalise();
-  NIO_Finalise();
   SST_Finalise();
+  NCR_Finalise();
+  NIO_Finalise();
+  CAM_Finalise();
   KEY_Finalise();
   RCL_Finalise();
   SRC_Finalise();
@@ -106,6 +120,7 @@ MAI_CleanupAndExit(void)
   SYS_Finalise();
   SCH_Finalise();
   LCL_Finalise();
+  PRV_Finalise();
 
   delete_pidfile();
   
@@ -264,7 +279,7 @@ write_lockfile(void)
   if (!out) {
     LOG_FATAL(LOGF_Main, "could not open lockfile %s for writing", pidfile);
   } else {
-    fprintf(out, "%d\n", getpid());
+    fprintf(out, "%d\n", (int)getpid());
     fclose(out);
   }
 }
@@ -274,11 +289,6 @@ write_lockfile(void)
 static void
 go_daemon(void)
 {
-#ifdef WINNT
-
-
-#else
-
   int pid, fd, pipefd[2];
 
   /* Create pipe which will the daemon use to notify the grandparent
@@ -337,8 +347,6 @@ go_daemon(void)
       LOG_SetParentFd(pipefd[1]);
     }
   }
-
-#endif
 }
 
 /* ================================================== */
@@ -347,14 +355,18 @@ int main
 (int argc, char **argv)
 {
   const char *conf_file = DEFAULT_CONF_FILE;
+  const char *progname = argv[0];
   char *user = NULL;
+  struct passwd *pw;
   int debug = 0, nofork = 0, address_family = IPADDR_UNSPEC;
   int do_init_rtc = 0, restarted = 0;
   int other_pid;
-  int lock_memory = 0, sched_priority = 0;
+  int scfilter_level = 0, lock_memory = 0, sched_priority = 0;
   int system_log = 1;
   int config_args = 0;
 
+  do_platform_checks();
+
   LOG_Initialise();
 
   /* Parse command line options */
@@ -381,12 +393,16 @@ int main
       } else {
         user = *argv;
       }
+    } else if (!strcmp("-F", *argv)) {
+      ++argv, --argc;
+      if (argc == 0 || sscanf(*argv, "%d", &scfilter_level) != 1)
+        LOG_FATAL(LOGF_Main, "Bad syscall filter level");
     } else if (!strcmp("-s", *argv)) {
       do_init_rtc = 1;
     } else if (!strcmp("-v", *argv) || !strcmp("--version",*argv)) {
       /* This write to the terminal is OK, it comes before we turn into a daemon */
       printf("chronyd (chrony) version %s (%s)\n", CHRONY_VERSION, CHRONYD_FEATURES);
-      exit(0);
+      return 0;
     } else if (!strcmp("-n", *argv)) {
       nofork = 1;
     } else if (!strcmp("-d", *argv)) {
@@ -405,6 +421,10 @@ int main
       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",
+             progname);
+      return 0;
     } else if (*argv[0] == '-') {
       LOG_FATAL(LOGF_Main, "Unrecognized command line option [%s]", *argv);
     } else {
@@ -417,7 +437,7 @@ int main
   if (getuid() != 0) {
     /* This write to the terminal is OK, it comes before we turn into a daemon */
     fprintf(stderr,"Not superuser\n");
-    exit(1);
+    return 1;
   }
 
   /* Turn into a daemon */
@@ -459,6 +479,7 @@ int main
    * be done *AFTER* the daemon-creation fork() */
   write_lockfile();
 
+  PRV_Initialise();
   LCL_Initialise();
   SCH_Initialise();
   SYS_Initialise();
@@ -467,6 +488,12 @@ int main
   RCL_Initialise();
   KEY_Initialise();
 
+  /* Open privileged ports before dropping root */
+  CAM_Initialise(address_family);
+  NIO_Initialise(address_family);
+  NCR_Initialise();
+  CNF_SetupAccessRestrictions();
+
   /* Command-line switch must have priority */
   if (!sched_priority) {
     sched_priority = CNF_GetSchedPriority();
@@ -482,17 +509,19 @@ int main
   if (!user) {
     user = CNF_GetUser();
   }
-  if (user && strcmp(user, "root")) {
-    SYS_DropRoot(user);
-  }
 
-  LOG_CreateLogFileDir();
+  if ((pw = getpwnam(user)) == NULL)
+    LOG_FATAL(LOGF_Main, "Could not get %s uid/gid", user);
+
+  /* Create all directories before dropping root */
+  CNF_CreateDirs(pw->pw_uid, pw->pw_gid);
+
+  /* Drop root privileges if the user has non-zero uid or gid */
+  if (pw->pw_uid || pw->pw_gid)
+    SYS_DropRoot(pw->pw_uid, pw->pw_gid);
 
   REF_Initialise();
   SST_Initialise();
-  NIO_Initialise(address_family);
-  CAM_Initialise(address_family);
-  NCR_Initialise();
   NSR_Initialise();
   CLG_Initialise();
   MNL_Initialise();
@@ -502,7 +531,12 @@ int main
   /* From now on, it is safe to do finalisation on exit */
   initialised = 1;
 
-  CNF_SetupAccessRestrictions();
+  UTI_SetQuitSignalsHandler(signal_cleanup);
+
+  CAM_OpenUnixSocket();
+
+  if (scfilter_level)
+    SYS_EnableSystemCallFilter(scfilter_level);
 
   if (ref_mode == REF_ModeNormal && CNF_GetInitSources() > 0) {
     ref_mode = REF_ModeInitStepSlew;
@@ -517,13 +551,6 @@ int main
     post_init_rtc_hook(NULL);
   }
 
-  signal(SIGINT, signal_cleanup);
-  signal(SIGTERM, signal_cleanup);
-#if !defined(WINNT)
-  signal(SIGQUIT, signal_cleanup);
-  signal(SIGHUP, signal_cleanup);
-#endif /* WINNT */
-
   /* The program normally runs under control of the main loop in
      the scheduler. */
   SCH_MainLoop();

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
 
@@ -39,37 +38,13 @@ echo $version > version.txt
 
 sed -i -e "s%@@VERSION@@%${version}%" examples/chrony.spec
 
-for m in chrony.1 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
+
+iconv -f utf-8 -t ascii//TRANSLIT < doc/installation.txt > INSTALL
+iconv -f utf-8 -t ascii//TRANSLIT < doc/faq.txt > FAQ
 
-./configure && make chrony.txt || exit 1
-mv chrony.txt chrony.txt_
 make distclean
-mv chrony.txt_ chrony.txt
-
-awk '/^[1-9] Installation$/{p=1}
-     /^[1-9]\.. Support for line editing/{exit}; p' chrony.txt | \
-  tail -n +4 > INSTALL
-
-if [ $(wc -l < INSTALL) -gt 100 -o $(wc -l < INSTALL) -lt 85 ]; then
-  echo "INSTALL generated incorrectly?"
-  exit 3
-fi
-
-awk '/^[1-9] Frequently asked questions$/{p=1}
-     /^Appendix A GNU General Public License$/{exit}; p' chrony.txt | \
- tail -n +4 | sed 's/^[1-9]\.\([1-9]\)/\1/' | sed 's/^----/--/' | \
- sed 's/^====/==/' > FAQ
-
-if [ $(wc -l < FAQ) -gt 400 -o $(wc -l < FAQ) -lt 200 ]; then
-  echo "FAQ generated incorrectly?"
-  exit 3
-fi
-
-rm -f config.h config.log make_release .gitignore
+rm -f make_release .gitignore
 
 cd ..
 tar cv --owner root --group root $subdir | gzip -9 > ${subdir}.tar.gz

mkdirpp.c

@@ -1,135 +0,0 @@
-/*
-  chronyd/chronyc - Programs for keeping computer clocks accurate.
-
- **********************************************************************
- * Copyright (C) Richard P. Curnow  1997-2002
- * 
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- * 
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- * 
- **********************************************************************
-
-  =======================================================================
-
-  A function for creating a directory and any parent directories that
-  don't exist.
-
-  */
-
-#include "config.h"
-
-#include "sysincl.h"
-
-#include "memory.h"
-#include "mkdirpp.h"
-
-static int
-do_dir(char *p)
-{
-  int status;
-  struct stat buf;
-
-#if defined(TEST)
-  fprintf(stderr, "do_dir(%s)\n", p);
-#endif
-
-  /* See if directory exists */
-  status = stat(p, &buf);
-
-  if (status < 0) {
-    if (errno == ENOENT) {
-      /* Try to create directory */
-      status = mkdir(p, 0755);
-      return status;
-    } else {
-      return status;
-    }
-  }
-
-  if (!S_ISDIR(buf.st_mode)) {
-    return -1;
-  }
-
-  return 0;
-}
-
-/* ================================================== */
-/* Return 0 if the directory couldn't be created, 1 if it could (or
-   already existed) */
-
-int
-mkdir_and_parents(const char *path)
-{
-  char *p;
-  int len;
-  int i, j, k, last;
-  len = strlen(path);
-
-  p = (char *)Malloc(1 + len);
-
-  i = k = 0;
-  while (1) {
-    p[i++] = path[k++];
-    
-    if (path[k] == '/' || !path[k]) {
-      p[i] = 0;
-
-      if (do_dir(p) < 0) {
-        Free(p);
-        return 0;
-      }
-
-      if (!path[k]) {
-        /* End of the string */
-        break;
-      }
-
-      /* check whether its a trailing / or group of / */
-      last = 1;
-      j = k+1;
-      while (path[j]) {
-        if (path[j] != '/') {
-          k = j - 1; /* Pick up a / into p[] thru the assignment at the top of the loop */
-          last = 0;
-          break;
-        }
-        j++;
-      }
-
-      if (last) {
-        break;
-      }
-    }
-
-    if (!path[k]) break;
-
-  }  
-
-  Free(p);
-  return 1;
-
-}
-
-/* ================================================== */
-
-#if defined(TEST)
-int main(int argc, char **argv) {
-  if (argc > 1) {
-    /* Invert sense of result */
-    return mkdir_and_parents(argv[1]) ? 0 : 1;
-  } else {
-    return 1;
-  }
-}
-#endif
-                                  

nameserv.c

@@ -49,7 +49,9 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
 #ifdef HAVE_GETADDRINFO
   struct addrinfo hints, *res, *ai;
   int i, result;
-  
+
+  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
+
   memset(&hints, 0, sizeof (hints));
   hints.ai_family = AF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
@@ -99,6 +101,8 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
   if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET4)
     return DNS_Failure;
 
+  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
+
   host = gethostbyname(name);
 
   if (host == NULL) {

nameserv.h

@@ -39,6 +39,9 @@ typedef enum {
 /* Resolve names only to selected address family */
 extern void DNS_SetAddressFamily(int family);
 
+/* Maximum number of addresses returned by DNS_Name2IPAddress */
+#define DNS_MAX_ADDRESSES 16
+
 extern DNS_Status DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs);
 
 extern int DNS_IPAddress2Name(IPAddr *ip_addr, char *name, int len);

nameserv_async.c

@@ -31,20 +31,19 @@
 #include "nameserv_async.h"
 #include "logging.h"
 #include "memory.h"
+#include "privops.h"
 #include "sched.h"
 #include "util.h"
 
 #ifdef USE_PTHREAD_ASYNCDNS
 #include <pthread.h>
 
-#define MAX_ADDRESSES 16
-
 /* ================================================== */
 
 struct DNS_Async_Instance {
   const char *name;
   DNS_Status status;
-  IPAddr addresses[MAX_ADDRESSES];
+  IPAddr addresses[DNS_MAX_ADDRESSES];
   DNS_NameResolveHandler handler;
   void *arg;
 
@@ -61,7 +60,7 @@ start_resolving(void *anything)
 {
   struct DNS_Async_Instance *inst = (struct DNS_Async_Instance *)anything;
 
-  inst->status = DNS_Name2IPAddress(inst->name, inst->addresses, MAX_ADDRESSES);
+  inst->status = PRV_Name2IPAddress(inst->name, inst->addresses, DNS_MAX_ADDRESSES);
 
   /* Notify the main thread that the result is ready */
   if (write(inst->pipe[1], "", 1) < 0)
@@ -88,7 +87,7 @@ end_resolving(void *anything)
   close(inst->pipe[0]);
   close(inst->pipe[1]);
 
-  for (i = 0; inst->status == DNS_Success && i < MAX_ADDRESSES &&
+  for (i = 0; inst->status == DNS_Success && i < DNS_MAX_ADDRESSES &&
               inst->addresses[i].family != IPADDR_UNSPEC; i++)
     ;
 

nameserv_async.h

@@ -34,8 +34,7 @@
 typedef void (*DNS_NameResolveHandler)(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *anything);
 
 /* Request resolving of a name to IP address. The handler will be
-   called when the result is available, but it may be also called
-   directly from this function call. */
+   called when the result is available. */
 extern void DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *anything);
 
 #endif

ntp.h

@@ -53,8 +53,8 @@ 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)
 
 /* Type definition for leap bits */
 typedef enum {
@@ -91,7 +91,7 @@ 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)
@@ -109,4 +109,9 @@ typedef struct {
 #define NTP_LVM(leap, version, mode) \
   ((((leap) << 6) & 0xc0) | (((version) << 3) & 0x38) | ((mode) & 0x07))
 
+/* Special NTP reference IDs */
+#define NTP_REFID_UNSYNC 0x0UL
+#define NTP_REFID_LOCAL 0x7F7F0101UL /* 127.127.1.1 */
+#define NTP_REFID_SMOOTH 0x7F7F01FFUL /* 127.127.1.255 */
+
 #endif /* GOT_NTP_H */

ntp_core.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2014
+ * 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
@@ -71,10 +71,8 @@ struct NCR_Instance_Record {
                                    (client/server or symmetric active peer) */
   OperatingMode opmode;         /* Whether we are sampling this source
                                    or not and in what way */
-  int timer_running;            /* Boolean indicating whether we have a timeout
-                                   pending to transmit to the source */
-  SCH_TimeoutID timeout_id;     /* Scheduler's timeout ID, if we are
-                                   running on a timer. */
+  SCH_TimeoutID rx_timeout_id;  /* Timeout ID for latest received response */
+  SCH_TimeoutID tx_timeout_id;  /* Timeout ID for next transmission */
   int tx_suspended;             /* Boolean indicating we can't transmit yet */
 
   int auto_offline;             /* If 1, automatically go offline if server/peer
@@ -217,6 +215,9 @@ static ARR_Instance broadcasts;
 /* Invalid stratum number */
 #define NTP_INVALID_STRATUM 0
 
+/* Maximum allowed time for server to process client packet */
+#define MAX_SERVER_INTERVAL 4.0
+
 /* Minimum and maximum allowed poll interval */
 #define MIN_POLL 0
 #define MAX_POLL 24
@@ -285,8 +286,8 @@ do_time_checks(void)
   NTP_int64 ntv1, ntv2;
   int r;
 
-  UTI_TimevalToInt64(&tv1, &ntv1, 0);
-  UTI_TimevalToInt64(&tv2, &ntv2, 0);
+  UTI_TimevalToInt64(&tv1, &ntv1, NULL);
+  UTI_TimevalToInt64(&tv2, &ntv2, NULL);
   UTI_Int64ToTimeval(&ntv1, &tv1);
   UTI_Int64ToTimeval(&ntv2, &tv2);
 
@@ -316,7 +317,7 @@ NCR_Initialise(void)
   do_time_checks();
 
   logfileid = CNF_GetLogMeasurements() ? LOG_FileOpen("measurements",
-      "   Date (UTC) Time     IP Address   L St 123 567 ABCD  LP RP Score Offset     Peer del. Peer disp. Root del.  Root disp.")
+      "   Date (UTC) Time     IP Address   L St 123 567 ABCD  LP RP Score    Offset  Peer del. Peer disp.  Root del. Root disp.")
     : -1;
 
   access_auth_table = ADF_CreateTable();
@@ -353,20 +354,20 @@ restart_timeout(NCR_Instance inst, double delay)
 {
   /* Check if we can transmit */
   if (inst->tx_suspended) {
-    assert(!inst->timer_running);
+    assert(!inst->tx_timeout_id);
     return;
   }
 
-  /* Stop old timer if running */
-  if (inst->timer_running)
-    SCH_RemoveTimeout(inst->timeout_id);
+  /* Stop both rx and tx timers if running */
+  SCH_RemoveTimeout(inst->rx_timeout_id);
+  inst->rx_timeout_id = 0;
+  SCH_RemoveTimeout(inst->tx_timeout_id);
 
   /* Start new timer for transmission */
-  inst->timeout_id = SCH_AddTimeoutInClass(delay, SAMPLING_SEPARATION,
-                                           SAMPLING_RANDOMNESS,
-                                           SCH_NtpSamplingClass,
-                                           transmit_timeout, (void *)inst);
-  inst->timer_running = 1;
+  inst->tx_timeout_id = SCH_AddTimeoutInClass(delay, SAMPLING_SEPARATION,
+                                              SAMPLING_RANDOMNESS,
+                                              SCH_NtpSamplingClass,
+                                              transmit_timeout, (void *)inst);
 }
 
 /* ================================================== */
@@ -374,14 +375,28 @@ restart_timeout(NCR_Instance inst, double delay)
 static void
 start_initial_timeout(NCR_Instance inst)
 {
-  if (!inst->timer_running) {
+  double delay, last_tx;
+  struct timeval now;
+
+  if (!inst->tx_timeout_id) {
     /* This will be the first transmission after mode change */
 
     /* Mark source active */
     SRC_SetActive(inst->source);
   }
 
-  restart_timeout(inst, INITIAL_DELAY);
+  /* In case the offline period was too short, adjust the delay to keep
+     the interval between packets at least as long as the current polling
+     interval */
+  SCH_GetLastEventTime(&now, NULL, NULL);
+  UTI_DiffTimevalsToDouble(&last_tx, &now, &inst->local_tx);
+  if (last_tx < 0.0)
+    last_tx = 0.0;
+  delay = get_transmit_delay(inst, 0, 0.0) - last_tx;
+  if (delay < INITIAL_DELAY)
+    delay = INITIAL_DELAY;
+
+  restart_timeout(inst, delay);
 }
 
 /* ================================================== */
@@ -393,6 +408,9 @@ close_client_socket(NCR_Instance inst)
     NIO_CloseClientSocket(inst->local_addr.sock_fd);
     inst->local_addr.sock_fd = INVALID_SOCK_FD;
   }
+
+  SCH_RemoveTimeout(inst->rx_timeout_id);
+  inst->rx_timeout_id = 0;
 }
 
 /* ================================================== */
@@ -401,10 +419,9 @@ static void
 take_offline(NCR_Instance inst)
 {
   inst->opmode = MD_OFFLINE;
-  if (inst->timer_running) {
-    SCH_RemoveTimeout(inst->timeout_id);
-    inst->timer_running = 0;
-  }
+
+  SCH_RemoveTimeout(inst->tx_timeout_id);
+  inst->tx_timeout_id = 0;
 
   /* Mark source unreachable */
   SRC_ResetReachability(inst->source);
@@ -480,22 +497,29 @@ NCR_GetInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourcePar
     result->do_auth = 1;
     result->auth_key_id = params->authkey;
     if (!KEY_KeyKnown(result->auth_key_id)) {
-      LOG(LOGS_WARN, LOGF_NtpCore, "Source %s added with unknown key %"PRIu32,
-          UTI_IPToString(&result->remote_addr.ip_addr), result->auth_key_id);
+      LOG(LOGS_WARN, LOGF_NtpCore, "Key %"PRIu32" used by source %s is %s",
+          result->auth_key_id, UTI_IPToString(&result->remote_addr.ip_addr),
+          "missing");
+    } else if (!KEY_CheckKeyLength(result->auth_key_id)) {
+      LOG(LOGS_WARN, LOGF_NtpCore, "Key %"PRIu32" used by source %s is %s",
+          result->auth_key_id, UTI_IPToString(&result->remote_addr.ip_addr),
+          "too short");
     }
   }
 
   /* Create a source instance for this NTP source */
   result->source = SRC_CreateNewInstance(UTI_IPToRefid(&remote_addr->ip_addr),
-                                         SRC_NTP, params->sel_option,
+                                         SRC_NTP, params->sel_options,
                                          &result->remote_addr.ip_addr,
                                          params->min_samples, params->max_samples);
 
-  result->timer_running = 0;
-  result->timeout_id = 0;
+  result->rx_timeout_id = 0;
+  result->tx_timeout_id = 0;
   result->tx_suspended = 1;
   result->opmode = params->online ? MD_ONLINE : MD_OFFLINE;
   result->local_poll = result->minpoll;
+  result->local_tx.tv_sec = 0;
+  result->local_tx.tv_usec = 0;
   
   NCR_ResetInstance(result);
 
@@ -553,8 +577,6 @@ NCR_ResetInstance(NCR_Instance instance)
   instance->remote_orig.lo = 0;
   instance->local_rx.tv_sec = 0;
   instance->local_rx.tv_usec = 0;
-  instance->local_tx.tv_sec = 0;
-  instance->local_tx.tv_usec = 0;
   instance->local_ntp_tx.hi = 0;
   instance->local_ntp_tx.lo = 0;
 
@@ -562,7 +584,7 @@ NCR_ResetInstance(NCR_Instance instance)
     instance->local_poll = instance->minpoll;
 
     /* The timer was set with a longer poll interval, restart it */
-    if (instance->timer_running)
+    if (instance->tx_timeout_id)
       restart_timeout(instance, get_transmit_delay(instance, 0, 0.0));
   }
 }
@@ -580,6 +602,7 @@ NCR_ChangeRemoteAddress(NCR_Instance inst, NTP_Remote_Address *remote_addr)
     close_client_socket(inst);
   else {
     NIO_CloseServerSocket(inst->local_addr.sock_fd);
+    inst->local_addr.ip_addr.family = IPADDR_UNSPEC;
     inst->local_addr.sock_fd = NIO_OpenServerSocket(remote_addr);
   }
 
@@ -738,6 +761,22 @@ get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx)
   return delay_time;
 }
 
+/* ================================================== */
+/* Timeout handler for closing the client socket when no acceptable
+   reply can be received from the server */
+
+static void
+receive_timeout(void *arg)
+{
+  NCR_Instance inst = (NCR_Instance)arg;
+
+  DEBUG_LOG(LOGF_NtpCore, "Receive timeout for [%s:%d]",
+            UTI_IPToString(&inst->remote_addr.ip_addr), inst->remote_addr.port);
+
+  inst->rx_timeout_id = 0;
+  close_client_socket(inst);
+}
+
 /* ================================================== */
 
 static int
@@ -762,13 +801,14 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
                 )
 {
   NTP_Packet message;
-  int leap, auth_len, length, ret;
+  int auth_len, length, ret, precision;
   struct timeval local_receive, local_transmit;
+  NTP_int64 ts_fuzz;
 
   /* Parameters read from reference module */
   int are_we_synchronised, our_stratum, smooth_time;
   NTP_Leap leap_status;
-  uint32_t our_ref_id, ts_fuzz;
+  uint32_t our_ref_id;
   struct timeval our_ref_time;
   double our_root_delay, our_root_dispersion, smooth_offset;
 
@@ -777,38 +817,50 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     version = NTP_VERSION;
   }
 
-  /* This is accurate enough and cheaper than calling LCL_ReadCookedTime.
-     A more accurate time stamp will be taken later in this function. */
-  SCH_GetLastEventTime(&local_transmit, NULL, NULL);
+  smooth_time = 0;
+  smooth_offset = 0.0;
 
-  REF_GetReferenceParams(&local_transmit,
-                         &are_we_synchronised, &leap_status,
-                         &our_stratum,
-                         &our_ref_id, &our_ref_time,
-                         &our_root_delay, &our_root_dispersion);
-
-  /* Get current smoothing offset when sending packet to a client */
-  if (SMT_IsEnabled() && (my_mode == MODE_SERVER || my_mode == MODE_BROADCAST)) {
-    smooth_time = 1;
-    smooth_offset = SMT_GetOffset(&local_transmit);
-
-    /* Suppress leap second when smoothing and slew mode are enabled */
-    if (REF_GetLeapMode() == REF_LeapModeSlew &&
-        (leap_status == LEAP_InsertSecond || leap_status == LEAP_DeleteSecond))
-      leap_status = LEAP_Normal;
+  if (my_mode == MODE_CLIENT) {
+    /* Don't reveal local time or state of the clock in client packets */
+    precision = 32;
+    leap_status = our_stratum = our_ref_id = 0;
+    our_ref_time.tv_sec = our_ref_time.tv_usec = 0;
+    our_root_delay = our_root_dispersion = 0.0;
   } else {
-    smooth_time = 0;
-    smooth_offset = 0.0;
+    /* This is accurate enough and cheaper than calling LCL_ReadCookedTime.
+       A more accurate timestamp will be taken later in this function. */
+    SCH_GetLastEventTime(&local_transmit, NULL, NULL);
+
+    REF_GetReferenceParams(&local_transmit,
+                           &are_we_synchronised, &leap_status,
+                           &our_stratum,
+                           &our_ref_id, &our_ref_time,
+                           &our_root_delay, &our_root_dispersion);
+
+    /* Get current smoothing offset when sending packet to a client */
+    if (SMT_IsEnabled() && (my_mode == MODE_SERVER || my_mode == MODE_BROADCAST)) {
+      smooth_offset = SMT_GetOffset(&local_transmit);
+      smooth_time = fabs(smooth_offset) > LCL_GetSysPrecisionAsQuantum();
+
+      /* Suppress leap second when smoothing and slew mode are enabled */
+      if (REF_GetLeapMode() == REF_LeapModeSlew &&
+          (leap_status == LEAP_InsertSecond || leap_status == LEAP_DeleteSecond))
+        leap_status = LEAP_Normal;
+    }
+
+    precision = LCL_GetSysPrecisionAsLog();
   }
 
-  if (are_we_synchronised) {
-    leap = (int) leap_status;
+  if (smooth_time) {
+    our_ref_id = NTP_REFID_SMOOTH;
+    UTI_AddDoubleToTimeval(&our_ref_time, smooth_offset, &our_ref_time);
+    UTI_AddDoubleToTimeval(local_rx, smooth_offset, &local_receive);
   } else {
-    leap = LEAP_Unsynchronised;
+    local_receive = *local_rx;
   }
 
   /* Generate transmit packet */
-  message.lvm = NTP_LVM(leap, version, my_mode);
+  message.lvm = NTP_LVM(leap_status, version, my_mode);
   /* Stratum 16 and larger are invalid */
   if (our_stratum < NTP_MAX_STRATUM) {
     message.stratum = our_stratum;
@@ -817,37 +869,33 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
   }
  
   message.poll = my_poll;
-  message.precision = LCL_GetSysPrecisionAsLog();
+  message.precision = precision;
 
   /* If we're sending a client mode packet and we aren't synchronized yet, 
      we might have to set up artificial values for some of these parameters */
   message.root_delay = UTI_DoubleToInt32(our_root_delay);
   message.root_dispersion = UTI_DoubleToInt32(our_root_dispersion);
 
-  message.reference_id = htonl((NTP_int32) our_ref_id);
+  message.reference_id = htonl(our_ref_id);
 
   /* Now fill in timestamps */
 
-  if (smooth_time) {
-    UTI_AddDoubleToTimeval(&our_ref_time, smooth_offset, &our_ref_time);
-    UTI_AddDoubleToTimeval(local_rx, smooth_offset, &local_receive);
-  } else {
-    local_receive = *local_rx;
-  }
-
-  UTI_TimevalToInt64(&our_ref_time, &message.reference_ts, 0);
+  UTI_TimevalToInt64(&our_ref_time, &message.reference_ts, NULL);
 
   /* Originate - this comes from the last packet the source sent us */
   message.originate_ts = *orig_ts;
 
+  /* Prepare random bits which will be added to the receive timestamp */
+  UTI_GetInt64Fuzz(&ts_fuzz, precision);
+
   /* Receive - this is when we received the last packet from the source.
      This timestamp will have been adjusted so that it will now look to
      the source like we have been running on our latest estimate of
      frequency all along */
-  UTI_TimevalToInt64(&local_receive, &message.receive_ts, 0);
+  UTI_TimevalToInt64(&local_receive, &message.receive_ts, &ts_fuzz);
 
   /* Prepare random bits which will be added to the transmit timestamp. */
-  ts_fuzz = UTI_GetNTPTsFuzz(message.precision);
+  UTI_GetInt64Fuzz(&ts_fuzz, precision);
 
   /* Transmit - this our local time right now!  Also, we might need to
      store this for our own use later, next time we receive a message
@@ -865,7 +913,7 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
        take to generate the authentication data. */
     local_transmit.tv_usec += KEY_GetAuthDelay(key_id);
     UTI_NormaliseTimeval(&local_transmit);
-    UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, ts_fuzz);
+    UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, &ts_fuzz);
 
     auth_len = KEY_GenerateAuth(key_id, (unsigned char *) &message,
         offsetof(NTP_Packet, auth_keyid),
@@ -885,7 +933,7 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
       message.auth_keyid = 0;
       length += sizeof (message.auth_keyid);
     }
-    UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, ts_fuzz);
+    UTI_TimevalToInt64(&local_transmit, &message.transmit_ts, &ts_fuzz);
   }
 
   ret = NIO_SendPacket(&message, where_to, from, length);
@@ -908,9 +956,10 @@ static void
 transmit_timeout(void *arg)
 {
   NCR_Instance inst = (NCR_Instance) arg;
+  NTP_Local_Address local_addr;
   int sent;
 
-  inst->timer_running = 0;
+  inst->tx_timeout_id = 0;
 
   switch (inst->opmode) {
     case MD_BURST_WAS_ONLINE:
@@ -943,6 +992,10 @@ transmit_timeout(void *arg)
     inst->local_addr.sock_fd = NIO_OpenClientSocket(&inst->remote_addr);
   }
 
+  /* Don't require the packet to be sent from the same address as before */
+  local_addr.ip_addr.family = IPADDR_UNSPEC;
+  local_addr.sock_fd = inst->local_addr.sock_fd;
+
   /* Check whether we need to 'warm up' the link to the other end by
      sending an NTP exchange to ensure both ends' ARP caches are
      primed.  On loaded systems this might also help ensure that bits
@@ -956,7 +1009,7 @@ transmit_timeout(void *arg)
        as the reply will be ignored */
     transmit_packet(MODE_CLIENT, inst->local_poll, inst->version, 0, 0,
                     &inst->remote_orig, &inst->local_rx, NULL, NULL,
-                    &inst->remote_addr, &inst->local_addr);
+                    &inst->remote_addr, &local_addr);
 
     inst->presend_done = 1;
 
@@ -974,7 +1027,7 @@ transmit_timeout(void *arg)
                          &inst->remote_orig,
                          &inst->local_rx, &inst->local_tx, &inst->local_ntp_tx,
                          &inst->remote_addr,
-                         &inst->local_addr);
+                         &local_addr);
 
   ++inst->tx_count;
 
@@ -1007,8 +1060,14 @@ transmit_timeout(void *arg)
 
   /* Restart timer for this message */
   restart_timeout(inst, get_transmit_delay(inst, 1, 0.0));
-}
 
+  /* If a client packet was just sent, schedule a timeout to close the socket
+     at the time when all server replies would fail the delay test, so the
+     socket is not open for longer than necessary */
+  if (inst->mode == MODE_CLIENT)
+    inst->rx_timeout_id = SCH_AddTimeoutByDelay(inst->max_delay + MAX_SERVER_INTERVAL,
+                                                receive_timeout, (void *)inst);
+}
 
 /* ================================================== */
 
@@ -1098,7 +1157,7 @@ static int
 receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Instance inst, NTP_Local_Address *local_addr, int length)
 {
   int pkt_leap;
-  uint32_t pkt_refid;
+  uint32_t pkt_refid, pkt_key_id;
   double pkt_root_delay;
   double pkt_root_dispersion;
 
@@ -1125,7 +1184,6 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
 
   /* These are the timeval equivalents of the remote epochs */  
   struct timeval remote_receive_tv, remote_transmit_tv;
-  struct timeval remote_reference_tv;
   struct timeval local_average, remote_average;
   double local_interval, remote_interval;
 
@@ -1164,7 +1222,6 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
 
   UTI_Int64ToTimeval(&message->receive_ts, &remote_receive_tv);
   UTI_Int64ToTimeval(&message->transmit_ts, &remote_transmit_tv);
-  UTI_Int64ToTimeval(&message->reference_ts, &remote_reference_tv);
 
   /* Check if the packet is valid per RFC 5905, section 8.
      The test values are 1 when passed and 0 when failed. */
@@ -1182,18 +1239,19 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
      association if not properly 'up'. */
   test3 = (message->originate_ts.hi || message->originate_ts.lo) &&
           (message->receive_ts.hi || message->receive_ts.lo) &&
-          (message->reference_ts.hi || message->reference_ts.lo) &&
           (message->transmit_ts.hi || message->transmit_ts.lo);
 
   /* Test 4 would check for denied access.  It would always pass as this
      function is called only for known sources. */
 
   /* Test 5 checks for authentication failure.  If we expect authenticated info
-     from this peer/server and the packet doesn't have it or the authentication
-     is bad, it's got to fail.  If the peer or server sends us an authenticated
-     frame, but we're not bothered about whether he authenticates or not, just
-     ignore the test. */
-  test5 = inst->do_auth ? check_packet_auth(message, length, NULL, NULL) : 1;
+     from this peer/server and the packet doesn't have it, the authentication
+     is bad, or it's authenticated with a different key than expected, it's got
+     to fail.  If we don't expect the packet to be authenticated, just ignore
+     the test. */
+  test5 = !inst->do_auth ||
+          (check_packet_auth(message, length, NULL, &pkt_key_id) &&
+           pkt_key_id == inst->auth_key_id);
 
   /* Test 6 checks for unsynchronised server */
   test6 = pkt_leap != LEAP_Unsynchronised &&
@@ -1201,10 +1259,8 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
           message->stratum != NTP_INVALID_STRATUM; 
 
   /* Test 7 checks for bad data.  The root distance must be smaller than a
-     defined maximum and the transmit time must not be before the time of
-     the last synchronisation update. */
-  test7 = pkt_root_delay / 2.0 + pkt_root_dispersion < NTP_MAX_DISPERSION &&
-          UTI_CompareTimevals(&remote_reference_tv, &remote_transmit_tv) < 1;
+     defined maximum. */
+  test7 = pkt_root_delay / 2.0 + pkt_root_dispersion < NTP_MAX_DISPERSION;
 
   /* The packet is considered valid if the tests above passed */
   valid_packet = test1 && test2 && test3 && test5 && test6 && test7;
@@ -1230,7 +1286,8 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
     inst->local_ntp_tx.hi = inst->local_ntp_tx.lo = 0;
 
   if (valid_packet) {
-    precision = LCL_GetSysPrecisionAsQuantum();
+    precision = LCL_GetSysPrecisionAsQuantum() +
+                UTI_Log2ToDouble(message->precision);
 
     SRC_GetFrequencyRange(inst->source, &source_freq_lo, &source_freq_hi);
     
@@ -1269,9 +1326,10 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
     
     /* Additional tests required to pass before accumulating the sample */
 
-    /* Test A requires that the round trip delay is less than an
-       administrator-defined value */ 
-    testA = delay <= inst->max_delay;
+    /* Test A requires that the peer delay is not larger than the configured
+       maximum and in client mode also that the server processing time is sane */
+    testA = delay <= inst->max_delay &&
+            (inst->mode != MODE_CLIENT || remote_interval <= MAX_SERVER_INTERVAL);
 
     /* Test B requires that the ratio of the round trip delay to the
        minimum one currently in the stats data register is less than an
@@ -1290,7 +1348,8 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
 
     /* Test D requires that the remote peer is not synchronised to us to
        prevent a synchronisation loop */
-    testD = message->stratum <= 1 || pkt_refid != UTI_IPToRefid(&local_addr->ip_addr);
+    testD = message->stratum <= 1 || REF_GetMode() != REF_ModeNormal ||
+            pkt_refid != UTI_IPToRefid(&local_addr->ip_addr);
   } else {
     offset = delay = dispersion = 0.0;
     sample_time = *now;
@@ -1324,24 +1383,6 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
 
   /* Reduce polling rate if KoD RATE was received */
   if (kod_rate) {
-    if (message->poll > inst->minpoll) {
-      /* Set our minpoll to message poll, but use a reasonable maximum */
-      if (message->poll <= MAX_KOD_RATE_POLL)
-        inst->minpoll = message->poll;
-      else if (inst->minpoll < MAX_KOD_RATE_POLL)
-        inst->minpoll = MAX_KOD_RATE_POLL;
-
-      if (inst->minpoll > inst->maxpoll)
-        inst->maxpoll = inst->minpoll;
-      if (inst->minpoll > inst->local_poll)
-        inst->local_poll = inst->minpoll;
-
-      LOG(LOGS_WARN, LOGF_NtpCore,
-          "Received KoD RATE with poll %d from %s, minpoll set to %d",
-          message->poll, UTI_IPToString(&inst->remote_addr.ip_addr),
-          inst->minpoll);
-    }
-
     /* Stop ongoing burst */
     if (inst->opmode == MD_BURST_WAS_OFFLINE || inst->opmode == MD_BURST_WAS_ONLINE) {
       inst->burst_good_samples_to_go = 0;
@@ -1366,8 +1407,7 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
                            &sample_time,
                            offset, delay, dispersion,
                            root_delay, root_dispersion,
-                           message->stratum > inst->min_stratum ?
-                             message->stratum : inst->min_stratum,
+                           MAX(message->stratum, inst->min_stratum),
                            (NTP_Leap) pkt_leap);
 
       SRC_SelectSource(inst->source);
@@ -1406,6 +1446,9 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
        server and the socket can be closed */
     close_client_socket(inst);
 
+    /* Update the local address */
+    inst->local_addr.ip_addr = local_addr->ip_addr;
+
     requeue_transmit = 1;
   }
 
@@ -1419,7 +1462,7 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
     }
 
     /* Get rid of old timeout and start a new one */
-    assert(inst->timer_running);
+    assert(inst->tx_timeout_id);
     restart_timeout(inst, delay_time);
   }
 
@@ -1479,7 +1522,7 @@ NCR_ProcessKnown
  int length                     /* the length of the received packet */
  )
 {
-  int pkt_mode, proc_packet, proc_as_unknown, log_peer_access;
+  int pkt_mode, proc_packet, proc_as_unknown;
 
   if (!check_packet_format(message, length))
     return 0;
@@ -1487,7 +1530,6 @@ NCR_ProcessKnown
   pkt_mode = NTP_LVM_TO_MODE(message->lvm);
   proc_packet = 0;
   proc_as_unknown = 0;
-  log_peer_access = 0;
 
   /* Now, depending on the mode we decide what to do */
   switch (pkt_mode) {
@@ -1495,7 +1537,6 @@ NCR_ProcessKnown
       switch (inst->mode) {
         case MODE_ACTIVE:
           /* Ordinary symmetric peering */
-          log_peer_access = 1;
           proc_packet = 1;
           break;
         case MODE_PASSIVE:
@@ -1518,7 +1559,6 @@ NCR_ProcessKnown
         case MODE_ACTIVE:
           /* This would arise if we have the remote configured as a peer and
              he does not have us configured */
-          log_peer_access = 1;
           proc_packet = 1;
           break;
         case MODE_PASSIVE:
@@ -1572,9 +1612,6 @@ NCR_ProcessKnown
       break;
   }
 
-  if (log_peer_access)
-    CLG_LogNTPPeerAccess(&inst->remote_addr.ip_addr, now->tv_sec);
-
   if (proc_packet) {
     /* Check if the reply was received by the socket that sent the request */
     if (local_addr->sock_fd != inst->local_addr.sock_fd) {
@@ -1618,7 +1655,7 @@ NCR_ProcessUnknown
  )
 {
   NTP_Mode pkt_mode, my_mode;
-  int has_auth, valid_auth;
+  int has_auth, valid_auth, log_index;
   uint32_t key_id;
 
   /* Ignore the packet if it wasn't received by server socket */
@@ -1644,12 +1681,10 @@ NCR_ProcessUnknown
     case MODE_ACTIVE:
       /* We are symmetric passive, even though we don't ever lock to him */
       my_mode = MODE_PASSIVE;
-      CLG_LogNTPPeerAccess(&remote_addr->ip_addr, now->tv_sec);
       break;
     case MODE_CLIENT:
       /* Reply with server packet */
       my_mode = MODE_SERVER;
-      CLG_LogNTPClientAccess(&remote_addr->ip_addr, now->tv_sec);
       break;
     default:
       /* Discard */
@@ -1657,6 +1692,14 @@ NCR_ProcessUnknown
       return;
   }
 
+  log_index = CLG_LogNTPAccess(&remote_addr->ip_addr, now);
+
+  /* Don't reply to all requests if the rate is excessive */
+  if (log_index >= 0 && CLG_LimitNTPResponseRate(log_index)) {
+      DEBUG_LOG(LOGF_NtpCore, "NTP packet discarded to limit response rate");
+      return;
+  }
+
   /* Check if the packet includes MAC that authenticates properly */
   valid_auth = check_packet_auth(message, length, &has_auth, &key_id);
 
@@ -1964,6 +2007,14 @@ NCR_GetRemoteAddress(NCR_Instance inst)
 
 /* ================================================== */
 
+uint32_t
+NCR_GetLocalRefid(NCR_Instance inst)
+{
+  return UTI_IPToRefid(&inst->local_addr.ip_addr);
+}
+
+/* ================================================== */
+
 int NCR_IsSyncPeer(NCR_Instance inst)
 {
   return SRC_IsSyncPeer(inst->source);

ntp_core.h

@@ -105,6 +105,8 @@ 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

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Timo Teras  2009
- * Copyright (C) Miroslav Lichvar  2009, 2013-2014
+ * Copyright (C) Miroslav Lichvar  2009, 2013-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -37,6 +37,7 @@
 #include "local.h"
 #include "logging.h"
 #include "conf.h"
+#include "privops.h"
 #include "util.h"
 
 #define INVALID_SOCK_FD -1
@@ -97,8 +98,13 @@ prepare_socket(int family, int port_number, int client_only)
   sock_fd = socket(family, SOCK_DGRAM, 0);
 
   if (sock_fd < 0) {
-    LOG(LOGS_ERR, LOGF_NtpIO, "Could not open %s NTP socket : %s",
-        family == AF_INET ? "IPv4" : "IPv6", strerror(errno));
+    if (!client_only) {
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not open %s NTP socket : %s",
+          UTI_SockaddrFamilyToString(family), strerror(errno));
+    } else {
+      DEBUG_LOG(LOGF_NtpIO, "Could not open %s NTP socket : %s",
+                UTI_SockaddrFamilyToString(family), strerror(errno));
+    }
     return INVALID_SOCK_FD;
   }
 
@@ -156,21 +162,21 @@ 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 */
   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
@@ -179,15 +185,15 @@ prepare_socket(int family, int port_number, int client_only)
   /* 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
 
   if (family == AF_INET) {
-#ifdef IP_PKTINFO
+#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
@@ -197,26 +203,28 @@ 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");
     }
-#elif defined(IPV6_PKTINFO)
+#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
   }
 #endif
 
   /* Bind the socket if a port or address was specified */
-  if (my_addr_len > 0 && bind(sock_fd, &my_addr.u, my_addr_len) < 0) {
+  if (my_addr_len > 0 && PRV_BindSocket(sock_fd, &my_addr.u, my_addr_len) < 0) {
     LOG(LOGS_ERR, LOGF_NtpIO, "Could not bind %s NTP socket : %s",
-        family == AF_INET ? "IPv4" : "IPv6", strerror(errno));
+        UTI_SockaddrFamilyToString(family), strerror(errno));
     close(sock_fd);
     return INVALID_SOCK_FD;
   }
@@ -526,7 +534,7 @@ read_from_socket(void *anything)
     local_addr.sock_fd = sock_fd;
 
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-#ifdef IP_PKTINFO
+#ifdef HAVE_IN_PKTINFO
       if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO) {
         struct in_pktinfo ipi;
 
@@ -536,7 +544,7 @@ read_from_socket(void *anything)
       }
 #endif
 
-#if defined(IPV6_PKTINFO) && defined(HAVE_IN6_PKTINFO)
+#ifdef HAVE_IN6_PKTINFO
       if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
         struct in6_pktinfo ipi;
 
@@ -624,7 +632,7 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   msg.msg_flags = 0;
   cmsglen = 0;
 
-#ifdef IP_PKTINFO
+#ifdef HAVE_IN_PKTINFO
   if (local_addr->ip_addr.family == IPADDR_INET4) {
     struct cmsghdr *cmsg;
     struct in_pktinfo *ipi;
@@ -642,7 +650,7 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr, NTP_Lo
   }
 #endif
 
-#if defined(IPV6_PKTINFO) && defined(HAVE_IN6_PKTINFO)
+#ifdef HAVE_IN6_PKTINFO
   if (local_addr->ip_addr.family == IPADDR_INET6) {
     struct cmsghdr *cmsg;
     struct in6_pktinfo *ipi;

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
@@ -49,14 +49,15 @@ typedef struct {
   NTP_Remote_Address *remote_addr; /* The address of this source, non-NULL
                                       means this slot in table is in use */
   NCR_Instance data;            /* Data for the protocol engine for this source */
+  char *name;                   /* Name of the source, may be NULL */
   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, the size should be a power of two */
+/* Hash table of SourceRecord, its size is a power of two and it's never
+   more than half full */
 static ARR_Instance records;
 
 /* Number of sources in the hash table */
@@ -69,6 +70,7 @@ static int auto_start_sources = 0;
 struct UnresolvedSource {
   char *name;
   int port;
+  int random_order;
   int replacement;
   union {
     struct {
@@ -85,6 +87,7 @@ struct UnresolvedSource {
 #define RESOLVE_INTERVAL_UNIT 7
 #define MIN_RESOLVE_INTERVAL 2
 #define MAX_RESOLVE_INTERVAL 9
+#define MIN_REPLACEMENT_INTERVAL 8
 
 static struct UnresolvedSource *unresolved_sources = NULL;
 static int resolving_interval = 0;
@@ -92,15 +95,11 @@ static SCH_TimeoutID resolving_id;
 static struct UnresolvedSource *resolving_source = NULL;
 static NSR_SourceResolvingEndHandler resolving_end_handler = NULL;
 
-#define MIN_POOL_RESOLVE_INTERVAL 5
 #define MAX_POOL_SOURCES 16
 #define INVALID_POOL (-1)
 
-/* Pool of sources, the name is expected to resolve to multiple addresses
-   which change over time */
+/* Pool of sources with the same name */
 struct SourcePool {
-  char *name;
-  int port;
   /* Number of sources added from this pool (ignoring tentative sources) */
   int sources;
   /* Maximum number of sources */
@@ -115,6 +114,7 @@ static ARR_Instance pools;
 
 static void resolve_sources(void *arg);
 static void rehash_records(void);
+static void clean_source_record(SourceRecord *record);
 
 static void
 slew_sources(struct timeval *raw,
@@ -162,16 +162,12 @@ NSR_Finalise(void)
   struct UnresolvedSource *us;
   unsigned int i;
 
-  for (i = 0; i < ARR_GetSize(pools); i++)
-    Free(((struct SourcePool *)ARR_GetElement(pools, i))->name);
   ARR_DestroyInstance(pools);
 
   for (i = 0; i < ARR_GetSize(records); i++) {
     record = get_record(i);
-    if (!record->remote_addr)
-      continue;
-    record->remote_addr = NULL;
-    NCR_DestroyInstance(record->data);
+    if (record->remote_addr)
+      clean_source_record(record);
   }
 
   ARR_DestroyInstance(records);
@@ -207,26 +203,16 @@ find_slot(NTP_Remote_Address *remote_addr, int *slot, int *found)
   uint32_t hash;
   unsigned int i, size;
   unsigned short port;
-  uint8_t *ip6;
 
   size = ARR_GetSize(records);
   
-  switch (remote_addr->ip_addr.family) {
-    case IPADDR_INET6:
-      ip6 = remote_addr->ip_addr.addr.in6;
-      hash = (ip6[0] ^ ip6[4] ^ ip6[8] ^ ip6[12]) |
-           (ip6[1] ^ ip6[5] ^ ip6[9] ^ ip6[13]) << 8 |
-           (ip6[2] ^ ip6[6] ^ ip6[10] ^ ip6[14]) << 16 |
-           (ip6[3] ^ ip6[7] ^ ip6[11] ^ ip6[15]) << 24;
-      break;
-    case IPADDR_INET4:
-      hash = remote_addr->ip_addr.addr.in4;
-      break;
-    default:
-      *found = *slot = 0;
-      return;
+  if (remote_addr->ip_addr.family != IPADDR_INET4 &&
+      remote_addr->ip_addr.family != IPADDR_INET6) {
+    *found = *slot = 0;
+    return;
   }
 
+  hash = UTI_IPToHash(&remote_addr->ip_addr);
   port = remote_addr->port;
 
   for (i = 0; i < size / 2; i++) {
@@ -248,12 +234,12 @@ find_slot(NTP_Remote_Address *remote_addr, int *slot, int *found)
 }
 
 /* ================================================== */
-
 /* Check if hash table of given size is sufficient to contain sources */
+
 static int
 check_hashtable_size(unsigned int sources, unsigned int size)
 {
-  return sources * 2 + 1 < size;
+  return sources * 2 <= size;
 }
 
 /* ================================================== */
@@ -271,7 +257,7 @@ rehash_records(void)
   memcpy(temp_records, ARR_GetElements(records), old_size * sizeof (SourceRecord));
 
   /* The size of the hash table is always a power of two */
-  for (new_size = 4; !check_hashtable_size(n_sources, new_size); new_size *= 2)
+  for (new_size = 1; !check_hashtable_size(n_sources, new_size); new_size *= 2)
     ;
 
   ARR_SetSize(records, new_size);
@@ -296,7 +282,7 @@ rehash_records(void)
 
 /* Procedure to add a new source */
 static NSR_Status
-add_source(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params, int pool)
+add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type, SourceParameters *params, int pool)
 {
   SourceRecord *record;
   int slot, found;
@@ -323,8 +309,9 @@ add_source(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParamete
       record = get_record(slot);
       record->data = NCR_GetInstance(remote_addr, type, params);
       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);
@@ -341,6 +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)
@@ -354,6 +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();
 
@@ -371,18 +368,22 @@ 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, "%s resolved to %s", us->name, 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;
     } else {
-      if (add_source(&address, us->new_source.type, &us->new_source.params,
+      if (add_source(&address, us->name, us->new_source.type, &us->new_source.params,
                      us->new_source.pool) == NSR_Success)
         added++;
 
@@ -403,6 +404,8 @@ name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *any
 
   assert(us == resolving_source);
 
+  DEBUG_LOG(LOGF_NtpSources, "%s resolved to %d addrs", us->name, n_addrs);
+
   switch (status) {
     case DNS_TryAgain:
       break;
@@ -495,7 +498,7 @@ append_unresolved_source(struct UnresolvedSource *us)
 NSR_Status
 NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params)
 {
-  return add_source(remote_addr, type, params, INVALID_POOL);
+  return add_source(remote_addr, NULL, type, params, INVALID_POOL);
 }
 
 /* ================================================== */
@@ -505,10 +508,20 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, Source
 {
   struct UnresolvedSource *us;
   struct SourcePool *sp;
+  NTP_Remote_Address remote_addr;
+
+  /* If the name is an IP address, don't bother with full resolving now
+     or later when trying to replace the source */
+  if (UTI_StringToIP(name, &remote_addr.ip_addr)) {
+    remote_addr.port = port;
+    NSR_AddSource(&remote_addr, type, params);
+    return;
+  }
 
   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;
@@ -518,8 +531,6 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, Source
     us->new_source.max_new_sources = 1;
   } else {
     sp = (struct SourcePool *)ARR_GetNewElement(pools);
-    sp->name = Strdup(name);
-    sp->port = port;
     sp->sources = 0;
     sp->max_sources = params->max_sources;
     us->new_source.pool = ARR_GetSize(pools) - 1;
@@ -587,6 +598,8 @@ clean_source_record(SourceRecord *record)
   assert(record->remote_addr);
   record->remote_addr = NULL;
   NCR_DestroyInstance(record->data);
+  if (record->name)
+    Free(record->name);
 
   n_sources--;
 }
@@ -640,15 +653,23 @@ NSR_RemoveAllSources(void)
 /* ================================================== */
 
 static void
-resolve_pool_replacement(struct SourcePool *sp, NTP_Remote_Address *addr)
+resolve_source_replacement(SourceRecord *record)
 {
   struct UnresolvedSource *us;
 
+  DEBUG_LOG(LOGF_NtpSources, "trying to replace %s",
+            UTI_IPToString(&record->remote_addr->ip_addr));
+
   us = MallocNew(struct UnresolvedSource);
-  us->name = Strdup(sp->name);
-  us->port = sp->port;
+  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 = *addr;
+  us->replace_source = *record->remote_addr;
 
   append_unresolved_source(us);
   NSR_ResolveSources();
@@ -662,32 +683,50 @@ NSR_HandleBadSource(IPAddr *address)
   static struct timeval last_replacement;
   struct timeval now;
   NTP_Remote_Address remote_addr;
-  struct SourcePool *pool;
-  int pool_index, slot, found;
+  SourceRecord *record;
+  int slot, found;
   double diff;
 
   remote_addr.ip_addr = *address;
   remote_addr.port = 0;
 
-  /* Only sources from a pool can be replaced */
   find_slot(&remote_addr, &slot, &found);
-  if (!found || (pool_index = get_record(slot)->pool) == INVALID_POOL)
+  if (!found)
     return;
 
-  pool = (struct SourcePool *)ARR_GetElement(pools, pool_index);
+  record = get_record(slot);
 
-  /* Don't resolve the pool name too frequently */
+  /* Only sources with a name can be replaced */
+  if (!record->name)
+    return;
+
+  /* Don't resolve names too frequently */
   SCH_GetLastEventTime(NULL, NULL, &now);
   UTI_DiffTimevalsToDouble(&diff, &now, &last_replacement);
-  if (fabs(diff) < RESOLVE_INTERVAL_UNIT * (1 << MIN_POOL_RESOLVE_INTERVAL)) {
+  if (fabs(diff) < RESOLVE_INTERVAL_UNIT * (1 << MIN_REPLACEMENT_INTERVAL)) {
     DEBUG_LOG(LOGF_NtpSources, "replacement postponed");
     return;
   }
   last_replacement = now;
 
-  DEBUG_LOG(LOGF_NtpSources, "pool replacement for %s", UTI_IPToString(address));
+  resolve_source_replacement(record);
+}
 
-  resolve_pool_replacement(pool, &remote_addr);
+/* ================================================== */
+
+void
+NSR_RefreshAddresses(void)
+{
+  SourceRecord *record;
+  unsigned int i;
+
+  for (i = 0; i < ARR_GetSize(records); i++) {
+    record = get_record(i);
+    if (!record->remote_addr || !record->name)
+      continue;
+
+    resolve_source_replacement(record);
+  }
 }
 
 /* ================================================== */
@@ -714,6 +753,26 @@ 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
@@ -733,20 +792,21 @@ NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP
       return;
 
     if (record->tentative) {
-      /* First reply from a pool source */
+      /* This was the first valid 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",
-                pool->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);

ntp_sources.h

@@ -80,6 +80,12 @@ extern void NSR_RemoveAllSources(void);
 /* Procedure to try to find a replacement for a bad source */
 extern void NSR_HandleBadSource(IPAddr *address);
 
+/* Procedure to resolve all names again */
+extern void NSR_RefreshAddresses(void);
+
+/* Procedure to get local reference ID corresponding to a source */
+extern uint32_t NSR_GetLocalRefid(IPAddr *address);
+
 /* This routine is called by ntp_io when a new packet arrives off the network */
 extern void NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);
 

pktlength.c

@@ -3,6 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2002
+ * Copyright (C) Miroslav Lichvar  2014-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -33,140 +34,121 @@
 #include "util.h"
 #include "pktlength.h"
 
+#define PADDING_LENGTH_(request_length, reply_length) \
+  (uint16_t)((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
+
+#define PADDING_LENGTH(request_data, reply_data) \
+  PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
+
+#define REQ_LENGTH_ENTRY(request_data_field, reply_data_field) \
+  { offsetof(CMD_Request, data.request_data_field.EOR), \
+    PADDING_LENGTH(data.request_data_field.EOR, data.reply_data_field.EOR) }
+
+#define RPY_LENGTH_ENTRY(reply_data_field) \
+  offsetof(CMD_Reply, data.reply_data_field.EOR)
+
 /* ================================================== */
 
-static int
-command_unpadded_length(CMD_Request *r)
-{
-  int type;
-  type = ntohs(r->command);
-  if (type < 0 || type >= N_REQUEST_TYPES) {
-    return 0;
-  } else {
-    switch (type) {
-      
-      case REQ_NULL:
-        return offsetof(CMD_Request, data);
-      case REQ_ONLINE:
-        return offsetof(CMD_Request, data.online.EOR);
-      case REQ_OFFLINE:
-        return offsetof(CMD_Request, data.offline.EOR);
-      case REQ_BURST:
-        return offsetof(CMD_Request, data.burst.EOR);
-      case REQ_MODIFY_MINPOLL:
-        return offsetof(CMD_Request, data.modify_minpoll.EOR);
-      case REQ_MODIFY_MAXPOLL:
-        return offsetof(CMD_Request, data.modify_maxpoll.EOR);
-      case REQ_DUMP:
-        return offsetof(CMD_Request, data.dump.EOR);
-      case REQ_MODIFY_MAXDELAY:
-        return offsetof(CMD_Request, data.modify_maxdelay.EOR);
-      case REQ_MODIFY_MAXDELAYRATIO:
-        return offsetof(CMD_Request, data.modify_maxdelayratio.EOR);
-      case REQ_MODIFY_MAXDELAYDEVRATIO:
-        return offsetof(CMD_Request, data.modify_maxdelaydevratio.EOR);
-      case REQ_MODIFY_MAXUPDATESKEW:
-        return offsetof(CMD_Request, data.modify_maxupdateskew.EOR);
-      case REQ_MODIFY_MAKESTEP:
-        return offsetof(CMD_Request, data.modify_makestep.EOR);
-      case REQ_LOGON :
-        return offsetof(CMD_Request, data.logon.EOR);
-      case REQ_SETTIME :
-        return offsetof(CMD_Request, data.settime.EOR);
-      case REQ_LOCAL :
-        return offsetof(CMD_Request, data.local.EOR);
-      case REQ_MANUAL :
-        return offsetof(CMD_Request, data.manual.EOR);
-      case REQ_N_SOURCES :
-        return offsetof(CMD_Request, data.n_sources.EOR);
-      case REQ_SOURCE_DATA :
-        return offsetof(CMD_Request, data.source_data.EOR);
-      case REQ_REKEY :
-        return offsetof(CMD_Request, data.rekey.EOR);
-      case REQ_ALLOW :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_ALLOWALL :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_DENY :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_DENYALL :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_CMDALLOW :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_CMDALLOWALL :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_CMDDENY :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_CMDDENYALL :
-        return offsetof(CMD_Request, data.allow_deny.EOR);
-      case REQ_ACCHECK :
-        return offsetof(CMD_Request, data.ac_check.EOR);
-      case REQ_CMDACCHECK :
-        return offsetof(CMD_Request, data.ac_check.EOR);
-      case REQ_ADD_SERVER :
-        return offsetof(CMD_Request, data.ntp_source.EOR);
-      case REQ_ADD_PEER :
-        return offsetof(CMD_Request, data.ntp_source.EOR);
-      case REQ_DEL_SOURCE :
-        return offsetof(CMD_Request, data.del_source.EOR);
-      case REQ_WRITERTC :
-        return offsetof(CMD_Request, data.writertc.EOR);
-      case REQ_DFREQ :
-        return offsetof(CMD_Request, data.dfreq.EOR);
-      case REQ_DOFFSET :
-        return offsetof(CMD_Request, data.doffset.EOR);
-      case REQ_TRACKING :
-        return offsetof(CMD_Request, data.tracking.EOR);
-      case REQ_SOURCESTATS :
-        return offsetof(CMD_Request, data.sourcestats.EOR);
-      case REQ_RTCREPORT :
-        return offsetof(CMD_Request, data.rtcreport.EOR);
-      case REQ_TRIMRTC :
-        return offsetof(CMD_Request, data.trimrtc.EOR);
-      case REQ_CYCLELOGS :
-        return offsetof(CMD_Request, data.cyclelogs.EOR);
-      case REQ_SUBNETS_ACCESSED :
-      case REQ_CLIENT_ACCESSES:
-        /* No longer supported */
-        return 0;
-      case REQ_CLIENT_ACCESSES_BY_INDEX:
-        return offsetof(CMD_Request, data.client_accesses_by_index.EOR);
-      case REQ_MANUAL_LIST:
-        return offsetof(CMD_Request, data.manual_list.EOR);
-      case REQ_MANUAL_DELETE:
-        return offsetof(CMD_Request, data.manual_delete.EOR);
-      case REQ_MAKESTEP:
-        return offsetof(CMD_Request, data.make_step.EOR);
-      case REQ_ACTIVITY:
-        return offsetof(CMD_Request, data.activity.EOR);
-      case REQ_RESELECT:
-        return offsetof(CMD_Request, data.reselect.EOR);
-      case REQ_RESELECTDISTANCE:
-        return offsetof(CMD_Request, data.reselect_distance.EOR);
-      case REQ_MODIFY_MINSTRATUM:
-        return offsetof(CMD_Request, data.modify_minstratum.EOR);
-      case REQ_MODIFY_POLLTARGET:
-        return offsetof(CMD_Request, data.modify_polltarget.EOR);
-      default:
-        /* If we fall through the switch, it most likely means we've forgotten to implement a new case */
-        assert(0);
-    }
-  }
+struct request_length {
+  uint16_t command;
+  uint16_t padding;
+};
 
-  /* Catch-all case */
-  return 0;
-
-}
+static const struct request_length request_lengths[] = {
+  REQ_LENGTH_ENTRY(null, null),                 /* NULL */
+  REQ_LENGTH_ENTRY(online, null),               /* ONLINE */
+  REQ_LENGTH_ENTRY(offline, null),              /* OFFLINE */
+  REQ_LENGTH_ENTRY(burst, null),                /* BURST */
+  REQ_LENGTH_ENTRY(modify_minpoll, null),       /* MODIFY_MINPOLL */
+  REQ_LENGTH_ENTRY(modify_maxpoll, null),       /* MODIFY_MAXPOLL */
+  REQ_LENGTH_ENTRY(dump, null),                 /* DUMP */
+  REQ_LENGTH_ENTRY(modify_maxdelay, null),      /* MODIFY_MAXDELAY */
+  REQ_LENGTH_ENTRY(modify_maxdelayratio, null), /* MODIFY_MAXDELAYRATIO */
+  REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
+  REQ_LENGTH_ENTRY(logon, null),                /* LOGON */
+  REQ_LENGTH_ENTRY(settime, manual_timestamp),  /* SETTIME */
+  { 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 */
+  REQ_LENGTH_ENTRY(null, null),                 /* REKEY */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* ALLOW */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* ALLOWALL */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* DENY */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* DENYALL */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDALLOW */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDALLOWALL */
+  REQ_LENGTH_ENTRY(allow_deny, null),           /* CMDDENY */
+  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 */
+  REQ_LENGTH_ENTRY(del_source, null),           /* DEL_SOURCE */
+  REQ_LENGTH_ENTRY(null, null),                 /* WRITERTC */
+  REQ_LENGTH_ENTRY(dfreq, null),                /* DFREQ */
+  REQ_LENGTH_ENTRY(doffset, null),              /* DOFFSET */
+  REQ_LENGTH_ENTRY(null, tracking),             /* TRACKING */
+  REQ_LENGTH_ENTRY(sourcestats, sourcestats),   /* SOURCESTATS */
+  REQ_LENGTH_ENTRY(null, rtc),                  /* RTCREPORT */
+  REQ_LENGTH_ENTRY(null, null),                 /* TRIMRTC */
+  REQ_LENGTH_ENTRY(null, null),                 /* CYCLELOGS */
+  { 0, 0 },                                     /* SUBNETS_ACCESSED - not supported */
+  { 0, 0 },                                     /* CLIENT_ACCESSES - not supported */
+  { 0, 0 },                                     /* CLIENT_ACCESSES_BY_INDEX - not supported */
+  REQ_LENGTH_ENTRY(null, manual_list),          /* MANUAL_LIST */
+  REQ_LENGTH_ENTRY(manual_delete, null),        /* MANUAL_DELETE */
+  REQ_LENGTH_ENTRY(null, null),                 /* MAKESTEP */
+  REQ_LENGTH_ENTRY(null, activity),             /* ACTIVITY */
+  REQ_LENGTH_ENTRY(modify_minstratum, null),    /* MODIFY_MINSTRATUM */
+  REQ_LENGTH_ENTRY(modify_polltarget, null),    /* MODIFY_POLLTARGET */
+  REQ_LENGTH_ENTRY(modify_maxdelaydevratio, null), /* MODIFY_MAXDELAYDEVRATIO */
+  REQ_LENGTH_ENTRY(null, null),                 /* RESELECT */
+  REQ_LENGTH_ENTRY(reselect_distance, null),    /* RESELECTDISTANCE */
+  REQ_LENGTH_ENTRY(modify_makestep, null),      /* MODIFY_MAKESTEP */
+  REQ_LENGTH_ENTRY(null, smoothing),            /* SMOOTHING */
+  REQ_LENGTH_ENTRY(smoothtime, null),           /* SMOOTHTIME */
+  REQ_LENGTH_ENTRY(null, null),                 /* REFRESH */
+  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 */
+};
 
+static const uint16_t reply_lengths[] = {
+  0,                                            /* empty slot */
+  RPY_LENGTH_ENTRY(null),                       /* NULL */
+  RPY_LENGTH_ENTRY(n_sources),                  /* N_SOURCES */
+  RPY_LENGTH_ENTRY(source_data),                /* SOURCE_DATA */
+  RPY_LENGTH_ENTRY(manual_timestamp),           /* MANUAL_TIMESTAMP */
+  RPY_LENGTH_ENTRY(tracking),                   /* TRACKING */
+  RPY_LENGTH_ENTRY(sourcestats),                /* SOURCESTATS */
+  RPY_LENGTH_ENTRY(rtc),                        /* RTC */
+  0,                                            /* SUBNETS_ACCESSED - not supported */
+  0,                                            /* CLIENT_ACCESSES - not supported */
+  0,                                            /* CLIENT_ACCESSES_BY_INDEX - not supported */
+  0,                                            /* MANUAL_LIST - variable length */
+  RPY_LENGTH_ENTRY(activity),                   /* ACTIVITY */
+  RPY_LENGTH_ENTRY(smoothing),                  /* SMOOTHING */
+  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS */
+  RPY_LENGTH_ENTRY(client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
+};
 
 /* ================================================== */
 
 int
 PKL_CommandLength(CMD_Request *r)
 {
+  uint32_t type;
   int command_length;
 
-  command_length = command_unpadded_length(r);
+  assert(sizeof (request_lengths) / sizeof (request_lengths[0]) == N_REQUEST_TYPES);
+
+  type = ntohs(r->command);
+  if (type >= N_REQUEST_TYPES)
+    return 0;
+
+  command_length = request_lengths[type].command;
   if (!command_length)
     return 0;
 
@@ -175,133 +157,20 @@ PKL_CommandLength(CMD_Request *r)
 
 /* ================================================== */
 
-#define PADDING_LENGTH_(request_length, reply_length) \
-  ((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
-
-#define PADDING_LENGTH(request_data, reply_data) \
-  PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
-
 int
 PKL_CommandPaddingLength(CMD_Request *r)
 {
-  int type;
+  uint32_t type;
 
   if (r->version < PROTO_VERSION_PADDING)
     return 0;
 
   type = ntohs(r->command);
 
-  if (type < 0 || type >= N_REQUEST_TYPES)
+  if (type >= N_REQUEST_TYPES)
     return 0;
 
-  switch (type) {
-    case REQ_NULL:
-      return PADDING_LENGTH(data, data.null.EOR);
-    case REQ_ONLINE:
-      return PADDING_LENGTH(data.online.EOR, data.null.EOR);
-    case REQ_OFFLINE:
-      return PADDING_LENGTH(data.offline.EOR, data.null.EOR);
-    case REQ_BURST:
-      return PADDING_LENGTH(data.burst.EOR, data.null.EOR);
-    case REQ_MODIFY_MINPOLL:
-      return PADDING_LENGTH(data.modify_minpoll.EOR, data.null.EOR);
-    case REQ_MODIFY_MAXPOLL:
-      return PADDING_LENGTH(data.modify_maxpoll.EOR, data.null.EOR);
-    case REQ_DUMP:
-      return PADDING_LENGTH(data.dump.EOR, data.null.EOR);
-    case REQ_MODIFY_MAXDELAY:
-      return PADDING_LENGTH(data.modify_maxdelay.EOR, data.null.EOR);
-    case REQ_MODIFY_MAXDELAYRATIO:
-      return PADDING_LENGTH(data.modify_maxdelayratio.EOR, data.null.EOR);
-    case REQ_MODIFY_MAXDELAYDEVRATIO:
-      return PADDING_LENGTH(data.modify_maxdelaydevratio.EOR, data.null.EOR);
-    case REQ_MODIFY_MAXUPDATESKEW:
-      return PADDING_LENGTH(data.modify_maxupdateskew.EOR, data.null.EOR);
-    case REQ_MODIFY_MAKESTEP:
-      return PADDING_LENGTH(data.modify_makestep.EOR, data.null.EOR);
-    case REQ_LOGON:
-      return PADDING_LENGTH(data.logon.EOR, data.null.EOR);
-    case REQ_SETTIME:
-      return PADDING_LENGTH(data.settime.EOR, data.manual_timestamp.EOR);
-    case REQ_LOCAL:
-      return PADDING_LENGTH(data.local.EOR, data.null.EOR);
-    case REQ_MANUAL:
-      return PADDING_LENGTH(data.manual.EOR, data.null.EOR);
-    case REQ_N_SOURCES:
-      return PADDING_LENGTH(data.n_sources.EOR, data.n_sources.EOR);
-    case REQ_SOURCE_DATA:
-      return PADDING_LENGTH(data.source_data.EOR, data.source_data.EOR);
-    case REQ_REKEY:
-      return PADDING_LENGTH(data.rekey.EOR, data.null.EOR);
-    case REQ_ALLOW:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_ALLOWALL:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_DENY:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_DENYALL:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_CMDALLOW:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_CMDALLOWALL:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_CMDDENY:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_CMDDENYALL:
-      return PADDING_LENGTH(data.allow_deny.EOR, data.null.EOR);
-    case REQ_ACCHECK:
-      return PADDING_LENGTH(data.ac_check.EOR, data.null.EOR);
-    case REQ_CMDACCHECK:
-      return PADDING_LENGTH(data.ac_check.EOR, data.null.EOR);
-    case REQ_ADD_SERVER:
-      return PADDING_LENGTH(data.ntp_source.EOR, data.null.EOR);
-    case REQ_ADD_PEER:
-      return PADDING_LENGTH(data.ntp_source.EOR, data.null.EOR);
-    case REQ_DEL_SOURCE:
-      return PADDING_LENGTH(data.del_source.EOR, data.null.EOR);
-    case REQ_WRITERTC:
-      return PADDING_LENGTH(data.writertc.EOR, data.null.EOR);
-    case REQ_DFREQ:
-      return PADDING_LENGTH(data.dfreq.EOR, data.null.EOR);
-    case REQ_DOFFSET:
-      return PADDING_LENGTH(data.doffset.EOR, data.null.EOR);
-    case REQ_TRACKING:
-      return PADDING_LENGTH(data.tracking.EOR, data.tracking.EOR);
-    case REQ_SOURCESTATS:
-      return PADDING_LENGTH(data.sourcestats.EOR, data.sourcestats.EOR);
-    case REQ_RTCREPORT:
-      return PADDING_LENGTH(data.rtcreport.EOR, data.rtc.EOR);
-    case REQ_TRIMRTC:
-      return PADDING_LENGTH(data.trimrtc.EOR, data.null.EOR);
-    case REQ_CYCLELOGS:
-      return PADDING_LENGTH(data.cyclelogs.EOR, data.null.EOR);
-    case REQ_SUBNETS_ACCESSED:
-    case REQ_CLIENT_ACCESSES:
-      /* No longer supported */
-      return 0;
-    case REQ_CLIENT_ACCESSES_BY_INDEX:
-      return PADDING_LENGTH(data.client_accesses_by_index.EOR, data.client_accesses_by_index.EOR);
-    case REQ_MANUAL_LIST:
-      return PADDING_LENGTH(data.manual_list.EOR, data.manual_list.EOR);
-    case REQ_MANUAL_DELETE:
-      return PADDING_LENGTH(data.manual_delete.EOR, data.null.EOR);
-    case REQ_MAKESTEP:
-      return PADDING_LENGTH(data.make_step.EOR, data.null.EOR);
-    case REQ_ACTIVITY:
-      return PADDING_LENGTH(data.activity.EOR, data.activity.EOR);
-    case REQ_RESELECT:
-      return PADDING_LENGTH(data.reselect.EOR, data.null.EOR);
-    case REQ_RESELECTDISTANCE:
-      return PADDING_LENGTH(data.reselect_distance.EOR, data.null.EOR);
-    case REQ_MODIFY_MINSTRATUM:
-      return PADDING_LENGTH(data.modify_minstratum.EOR, data.null.EOR);
-    case REQ_MODIFY_POLLTARGET:
-      return PADDING_LENGTH(data.modify_polltarget.EOR, data.null.EOR);
-    default:
-      /* If we fall through the switch, it most likely means we've forgotten to implement a new case */
-      assert(0);
-      return 0;
-  }
+  return request_lengths[ntohs(r->command)].padding;
 }
 
 /* ================================================== */
@@ -309,64 +178,32 @@ PKL_CommandPaddingLength(CMD_Request *r)
 int
 PKL_ReplyLength(CMD_Reply *r)
 {
-  int type;
+  uint32_t type;
+
+  assert(sizeof (reply_lengths) / sizeof (reply_lengths[0]) == N_REPLY_TYPES);
+
   type = ntohs(r->reply);
+
   /* Note that reply type codes start from 1, not 0 */
-  if (type < 1 || type >= N_REPLY_TYPES) {
+  if (type < 1 || type >= N_REPLY_TYPES)
     return 0;
-  } else {
-    switch (type) {
-      case RPY_NULL:
-        return offsetof(CMD_Reply, data.null.EOR);
-      case RPY_N_SOURCES:
-        return offsetof(CMD_Reply, data.n_sources.EOR);
-      case RPY_SOURCE_DATA:
-        return offsetof(CMD_Reply, data.source_data.EOR);
-      case RPY_MANUAL_TIMESTAMP:
-        return offsetof(CMD_Reply, data.manual_timestamp.EOR);
-      case RPY_TRACKING:
-        return offsetof(CMD_Reply, data.tracking.EOR);
-      case RPY_SOURCESTATS:
-        return offsetof(CMD_Reply, data.sourcestats.EOR);
-      case RPY_RTC:
-        return offsetof(CMD_Reply, data.rtc.EOR);
-      case RPY_SUBNETS_ACCESSED :
-      case RPY_CLIENT_ACCESSES:
-        /* No longer supported */
-        return 0;
-      case RPY_CLIENT_ACCESSES_BY_INDEX:
-        {
-          unsigned long nc = ntohl(r->data.client_accesses_by_index.n_clients);
-          if (r->status == htons(STT_SUCCESS)) {
-            if (nc > MAX_CLIENT_ACCESSES)
-              return 0;
-            return (offsetof(CMD_Reply, data.client_accesses_by_index.clients) +
-                    nc * sizeof(RPY_ClientAccesses_Client));
-          } else {
-            return offsetof(CMD_Reply, data);
-          }
-        }
-      case RPY_MANUAL_LIST:
-        {
-          unsigned long ns = ntohl(r->data.manual_list.n_samples);
-          if (ns > MAX_MANUAL_LIST_SAMPLES)
-            return 0;
-          if (r->status == htons(STT_SUCCESS)) {
-            return (offsetof(CMD_Reply, data.manual_list.samples) +
-                    ns * sizeof(RPY_ManualListSample));
-          } else {
-            return offsetof(CMD_Reply, data);
-          }
-        }
-      case RPY_ACTIVITY:
-        return offsetof(CMD_Reply, data.activity.EOR);
-        
-      default:
-        assert(0);
-    }
+
+  /* Length of MANUAL_LIST depends on number of samples stored in it */
+  if (type == RPY_MANUAL_LIST) {
+    uint32_t ns;
+
+    if (r->status != htons(STT_SUCCESS))
+      return offsetof(CMD_Reply, data);
+
+    ns = ntohl(r->data.manual_list.n_samples);
+    if (ns > MAX_MANUAL_LIST_SAMPLES)
+      return 0;
+
+    return offsetof(CMD_Reply, data.manual_list.samples) +
+           ns * sizeof (RPY_ManualListSample);
   }
 
-  return 0;
+  return reply_lengths[type];
 }
 
 /* ================================================== */

privops.c

@@ -0,0 +1,689 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Bryan Christianson 2015
+ * 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.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  Perform privileged operations over a unix socket to a privileged fork.
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "conf.h"
+#include "nameserv.h"
+#include "logging.h"
+#include "privops.h"
+#include "util.h"
+
+#define OP_ADJUSTTIME     1024
+#define OP_ADJUSTTIMEX    1025
+#define OP_SETTIME        1026
+#define OP_BINDSOCKET     1027
+#define OP_NAME2IPADDRESS 1028
+#define OP_QUIT           1099
+
+union sockaddr_in46 {
+  struct sockaddr_in in4;
+#ifdef FEAT_IPV6
+  struct sockaddr_in6 in6;
+#endif
+  struct sockaddr u;
+};
+
+/* daemon request structs */
+
+typedef struct {
+  struct timeval tv;
+} ReqAdjustTime;
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+typedef struct {
+  struct timex tmx;
+} ReqAdjustTimex;
+#endif
+
+typedef struct {
+  struct timeval tv;
+} ReqSetTime;
+
+typedef struct {
+  int sock;
+  socklen_t sa_len;
+  union sockaddr_in46 sa;
+} ReqBindSocket;
+
+typedef struct {
+  char name[256];
+} ReqName2IPAddress;
+
+typedef struct {
+  int op;
+  union {
+    ReqAdjustTime adjust_time;
+#ifdef PRIVOPS_ADJUSTTIMEX
+    ReqAdjustTimex adjust_timex;
+#endif
+    ReqSetTime set_time;
+    ReqBindSocket bind_socket;
+#ifdef PRIVOPS_NAME2IPADDRESS
+    ReqName2IPAddress name_to_ipaddress;
+#endif
+  } data;
+} PrvRequest;
+
+/* helper response structs */
+
+typedef struct {
+  struct timeval tv;
+} ResAdjustTime;
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+typedef struct {
+  struct timex tmx;
+} ResAdjustTimex;
+#endif
+
+typedef struct {
+  IPAddr addresses[DNS_MAX_ADDRESSES];
+} ResName2IPAddress;
+
+typedef struct {
+  char msg[256];
+} ResFatalMsg;
+
+typedef struct {
+  int fatal_error;
+  int rc;
+  int res_errno;
+  union {
+    ResFatalMsg fatal_msg;
+    ResAdjustTime adjust_time;
+#ifdef PRIVOPS_ADJUSTTIMEX
+    ResAdjustTimex adjust_timex;
+#endif
+#ifdef PRIVOPS_NAME2IPADDRESS
+    ResName2IPAddress name_to_ipaddress;
+#endif
+  } data;
+} PrvResponse;
+
+static int helper_fd;
+static pid_t helper_pid;
+
+static int
+have_helper(void)
+{
+  return helper_fd >= 0;
+}
+
+/* ======================================================================= */
+
+/* HELPER - prepare fatal error for daemon */
+static void
+res_fatal(PrvResponse *res, const char *fmt, ...)
+{
+  va_list ap;
+
+  res->fatal_error = 1;
+  va_start(ap, fmt);
+  vsnprintf(res->data.fatal_msg.msg, sizeof (res->data.fatal_msg.msg), fmt, ap);
+  va_end(ap);
+}
+
+/* ======================================================================= */
+
+/* HELPER - send response to the fd */
+
+static int
+send_response(int fd, const PrvResponse *res)
+{
+  if (send(fd, res, sizeof (*res), 0) != sizeof (*res))
+    return 0;
+
+  return 1;
+}
+
+/* ======================================================================= */
+/* receive daemon request plus optional file descriptor over a unix socket */
+
+static int
+receive_from_daemon(int fd, PrvRequest *req)
+{
+  struct msghdr msg;
+  struct cmsghdr *cmsg;
+  struct iovec iov;
+  char cmsgbuf[256];
+
+  iov.iov_base = req;
+  iov.iov_len = sizeof (*req);
+
+  msg.msg_name = NULL;
+  msg.msg_namelen = 0;
+  msg.msg_iov = &iov;
+  msg.msg_iovlen = 1;
+  msg.msg_control = (void *)cmsgbuf;
+  msg.msg_controllen = sizeof (cmsgbuf);
+  msg.msg_flags = MSG_WAITALL;
+
+  /* read the data */
+  if (recvmsg(fd, &msg, 0) != sizeof (*req))
+    return 0;
+
+  if (req->op == OP_BINDSOCKET) {
+    /* extract transferred descriptor */
+    req->data.bind_socket.sock = -1;
+    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
+        memcpy(&req->data.bind_socket.sock, CMSG_DATA(cmsg), sizeof (int));
+    }
+
+    /* return error if valid descriptor not found */
+    if (req->data.bind_socket.sock < 0)
+      return 0;
+  }
+
+  return 1;
+}
+
+/* ======================================================================= */
+
+/* HELPER - perform adjtime() */
+
+#ifdef PRIVOPS_ADJUSTTIME
+static void
+do_adjust_time(const ReqAdjustTime *req, PrvResponse *res)
+{
+  res->rc = adjtime(&req->tv, &res->data.adjust_time.tv);
+  if (res->rc)
+    res->res_errno = errno;
+}
+#endif
+
+/* ======================================================================= */
+
+/* HELPER - perform ntp_adjtime() */
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+static void
+do_adjust_timex(const ReqAdjustTimex *req, PrvResponse *res)
+{
+  res->data.adjust_timex.tmx = req->tmx;
+  res->rc = ntp_adjtime(&res->data.adjust_timex.tmx);
+  if (res->rc < 0)
+    res->res_errno = errno;
+}
+#endif
+
+/* ======================================================================= */
+
+/* HELPER - perform settimeofday() */
+
+#ifdef PRIVOPS_SETTIME
+static void
+do_set_time(const ReqSetTime *req, PrvResponse *res)
+{
+  res->rc = settimeofday(&req->tv, NULL);
+  if (res->rc)
+    res->res_errno = errno;
+}
+#endif
+
+/* ======================================================================= */
+
+/* HELPER - perform bind() */
+
+#ifdef PRIVOPS_BINDSOCKET
+static void
+do_bind_socket(ReqBindSocket *req, PrvResponse *res)
+{
+  unsigned short port;
+  IPAddr ip;
+  int sock_fd;
+  struct sockaddr *sa;
+  socklen_t sa_len;
+
+  sa = &req->sa.u;
+  sa_len = req->sa_len;
+  sock_fd = req->sock;
+
+  UTI_SockaddrToIPAndPort(sa, &ip, &port);
+  if (port && port != CNF_GetNTPPort()) {
+    close(sock_fd);
+    res_fatal(res, "Invalid port %d", port);
+    return;
+  }
+
+  res->rc = bind(sock_fd, sa, sa_len);
+  if (res->rc)
+    res->res_errno = errno;
+
+  /* sock is still open on daemon side, but we're done with it in the helper */
+  close(sock_fd);
+}
+#endif
+
+/* ======================================================================= */
+
+/* HELPER - perform DNS_Name2IPAddress() */
+
+#ifdef PRIVOPS_NAME2IPADDRESS
+static void
+do_name_to_ipaddress(ReqName2IPAddress *req, PrvResponse *res)
+{
+  /* make sure the string is terminated */
+  req->name[sizeof (req->name) - 1] = '\0';
+
+  DNS_Reload();
+
+  res->rc = DNS_Name2IPAddress(req->name, res->data.name_to_ipaddress.addresses,
+                               DNS_MAX_ADDRESSES);
+}
+#endif
+
+/* ======================================================================= */
+
+/* HELPER - main loop - action requests from the daemon */
+
+static void
+helper_main(int fd)
+{
+  PrvRequest req;
+  PrvResponse res;
+  int quit = 0;
+
+  while (!quit) {
+    if (!receive_from_daemon(fd, &req))
+      /* read error or closed input - we cannot recover - give up */
+      break;
+
+    memset(&res, 0, sizeof (res));
+
+    switch (req.op) {
+#ifdef PRIVOPS_ADJUSTTIME
+      case OP_ADJUSTTIME:
+        do_adjust_time(&req.data.adjust_time, &res);
+        break;
+#endif
+#ifdef PRIVOPS_ADJUSTTIMEX
+      case OP_ADJUSTTIMEX:
+        do_adjust_timex(&req.data.adjust_timex, &res);
+        break;
+#endif
+#ifdef PRIVOPS_SETTIME
+      case OP_SETTIME:
+        do_set_time(&req.data.set_time, &res);
+        break;
+#endif
+#ifdef PRIVOPS_BINDSOCKET
+      case OP_BINDSOCKET:
+        do_bind_socket(&req.data.bind_socket, &res);
+        break;
+#endif
+#ifdef PRIVOPS_NAME2IPADDRESS
+      case OP_NAME2IPADDRESS:
+        do_name_to_ipaddress(&req.data.name_to_ipaddress, &res);
+        break;
+#endif
+      case OP_QUIT:
+        quit = 1;
+        continue;
+
+      default:
+        res_fatal(&res, "Unexpected operator %d", req.op);
+        break;
+    }
+
+    send_response(fd, &res);
+  }
+
+  close(fd);
+  exit(0);
+}
+
+/* ======================================================================= */
+
+/* DAEMON - receive helper response */
+
+static void
+receive_response(PrvResponse *res)
+{
+  int resp_len;
+
+  resp_len = recv(helper_fd, res, sizeof (*res), 0);
+  if (resp_len < 0)
+    LOG_FATAL(LOGF_PrivOps, "Could not read from helper : %s", strerror(errno));
+  if (resp_len != sizeof (*res))
+    LOG_FATAL(LOGF_PrivOps, "Invalid helper response");
+
+  if (res->fatal_error)
+    LOG_FATAL(LOGF_PrivOps, "Error in helper : %s", res->data.fatal_msg.msg);
+
+  DEBUG_LOG(LOGF_PrivOps, "Received response rc=%d", res->rc);
+
+  /* if operation failed in the helper, set errno so daemon can print log message */
+  if (res->res_errno)
+    errno = res->res_errno;
+}
+
+/* ======================================================================= */
+
+/* DAEMON - send daemon request to the helper */
+
+static void
+send_request(PrvRequest *req)
+{
+  struct msghdr msg;
+  struct iovec iov;
+  char cmsgbuf[256];
+
+  iov.iov_base = req;
+  iov.iov_len = sizeof (*req);
+
+  msg.msg_name = NULL;
+  msg.msg_namelen = 0;
+  msg.msg_iov = &iov;
+  msg.msg_iovlen = 1;
+  msg.msg_control = NULL;
+  msg.msg_controllen = 0;
+  msg.msg_flags = 0;
+
+  if (req->op == OP_BINDSOCKET) {
+    /* send file descriptor as a control message */
+    struct cmsghdr *cmsg;
+    int *ptr_send_fd;
+
+    msg.msg_control = cmsgbuf;
+    msg.msg_controllen = CMSG_SPACE(sizeof (int));
+
+    cmsg = CMSG_FIRSTHDR(&msg);
+    memset(cmsg, 0, CMSG_SPACE(sizeof (int)));
+
+    cmsg->cmsg_level = SOL_SOCKET;
+    cmsg->cmsg_type = SCM_RIGHTS;
+    cmsg->cmsg_len = CMSG_LEN(sizeof (int));
+
+    ptr_send_fd = (int *)CMSG_DATA(cmsg);
+    *ptr_send_fd = req->data.bind_socket.sock;
+  }
+
+  if (sendmsg(helper_fd, &msg, 0) < 0) {
+    /* don't try to send another request from exit() */
+    helper_fd = -1;
+    LOG_FATAL(LOGF_PrivOps, "Could not send to helper : %s", strerror(errno));
+  }
+
+  DEBUG_LOG(LOGF_PrivOps, "Sent request op=%d", req->op);
+}
+
+/* ======================================================================= */
+
+/* DAEMON - send daemon request and wait for response */
+
+static void
+submit_request(PrvRequest *req, PrvResponse *res)
+{
+  send_request(req);
+  receive_response(res);
+}
+
+/* ======================================================================= */
+
+/* DAEMON - send the helper a request to exit and wait until it exits */
+
+static void
+stop_helper(void)
+{
+  PrvRequest req;
+  int status;
+
+  if (!have_helper())
+    return;
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_QUIT;
+  send_request(&req);
+
+  waitpid(helper_pid, &status, 0);
+}
+
+/* ======================================================================= */
+
+/* DAEMON - request adjtime() */
+
+#ifdef PRIVOPS_ADJUSTTIME
+int
+PRV_AdjustTime(const struct timeval *delta, struct timeval *olddelta)
+{
+  PrvRequest req;
+  PrvResponse res;
+
+  if (!have_helper() || delta == NULL)
+    /* helper is not running or read adjustment call */
+    return adjtime(delta, olddelta);
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_ADJUSTTIME;
+  req.data.adjust_time.tv = *delta;
+
+  submit_request(&req, &res);
+
+  if (olddelta)
+    *olddelta = res.data.adjust_time.tv;
+
+  return res.rc;
+}
+#endif
+
+/* ======================================================================= */
+
+/* DAEMON - request ntp_adjtime() */
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+int
+PRV_AdjustTimex(struct timex *tmx)
+{
+  PrvRequest req;
+  PrvResponse res;
+
+  if (!have_helper())
+    return ntp_adjtime(tmx);
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_ADJUSTTIMEX;
+  req.data.adjust_timex.tmx = *tmx;
+
+  submit_request(&req, &res);
+
+  *tmx = res.data.adjust_timex.tmx;
+
+  return res.rc;
+}
+#endif
+
+/* ======================================================================= */
+
+/* DAEMON - request settimeofday() */
+
+#ifdef PRIVOPS_SETTIME
+int
+PRV_SetTime(const struct timeval *tp, const struct timezone *tzp)
+{
+  PrvRequest req;
+  PrvResponse res;
+
+  /* only support setting the time */
+  assert(tp != NULL);
+  assert(tzp == NULL);
+
+  if (!have_helper())
+    return settimeofday(tp, NULL);
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_SETTIME;
+  req.data.set_time.tv = *tp;
+
+  submit_request(&req, &res);
+
+  return res.rc;
+}
+#endif
+
+/* ======================================================================= */
+
+/* DAEMON - request bind() */
+
+#ifdef PRIVOPS_BINDSOCKET
+int
+PRV_BindSocket(int sock, struct sockaddr *address, socklen_t address_len)
+{
+  PrvRequest req;
+  PrvResponse res;
+  IPAddr ip;
+  unsigned short port;
+
+  UTI_SockaddrToIPAndPort(address, &ip, &port);
+  assert(!port || port == CNF_GetNTPPort());
+
+  if (!have_helper())
+    return bind(sock, address, address_len);
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_BINDSOCKET;
+  req.data.bind_socket.sock = sock;
+  req.data.bind_socket.sa_len = address_len;
+  memcpy(&req.data.bind_socket.sa.u, address, address_len);
+
+  submit_request(&req, &res);
+
+  return res.rc;
+}
+#endif
+
+/* ======================================================================= */
+
+/* DAEMON - request DNS_Name2IPAddress() */
+
+#ifdef PRIVOPS_NAME2IPADDRESS
+int
+PRV_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
+{
+  PrvRequest req;
+  PrvResponse res;
+  int i;
+
+  if (!have_helper())
+    return DNS_Name2IPAddress(name, ip_addrs, max_addrs);
+
+  memset(&req, 0, sizeof (req));
+  req.op = OP_NAME2IPADDRESS;
+  if (snprintf(req.data.name_to_ipaddress.name, sizeof (req.data.name_to_ipaddress.name),
+               "%s", name) >= sizeof (req.data.name_to_ipaddress.name)) {
+    DEBUG_LOG(LOGF_PrivOps, "Name too long");
+    return DNS_Failure;
+  }
+
+  submit_request(&req, &res);
+
+  for (i = 0; i < max_addrs && i < DNS_MAX_ADDRESSES; i++)
+    ip_addrs[i] = res.data.name_to_ipaddress.addresses[i];
+
+  return res.rc;
+}
+#endif
+
+/* ======================================================================= */
+
+void
+PRV_Initialise(void)
+{
+  helper_fd = -1;
+}
+
+/* ======================================================================= */
+
+/* DAEMON - setup socket(s) then fork to run the helper */
+/* must be called before privileges are dropped */
+
+void
+PRV_StartHelper(void)
+{
+  pid_t pid;
+  int fd, sock_pair[2];
+
+  if (have_helper())
+    LOG_FATAL(LOGF_PrivOps, "Helper already running");
+
+  if (
+#ifdef SOCK_SEQPACKET
+      socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock_pair) &&
+#endif
+      socketpair(AF_UNIX, SOCK_DGRAM, 0, sock_pair))
+    LOG_FATAL(LOGF_PrivOps, "socketpair() failed : %s", strerror(errno));
+
+  UTI_FdSetCloexec(sock_pair[0]);
+  UTI_FdSetCloexec(sock_pair[1]);
+
+  pid = fork();
+  if (pid < 0)
+    LOG_FATAL(LOGF_PrivOps, "fork() failed : %s", strerror(errno));
+
+  if (pid == 0) {
+    /* child process */
+    close(sock_pair[0]);
+
+    /* close other descriptors inherited from the parent process */
+    for (fd = 0; fd < 1024; fd++) {
+      if (fd != sock_pair[1])
+        close(fd);
+    }
+
+    /* ignore signals, the process will exit on OP_QUIT request */
+    UTI_SetQuitSignalsHandler(SIG_IGN);
+
+    helper_main(sock_pair[1]);
+
+  } else {
+    /* parent process */
+    close(sock_pair[1]);
+    helper_fd = sock_pair[0];
+    helper_pid = pid;
+
+    /* stop the helper even when not exiting cleanly from the main function */
+    atexit(stop_helper);
+  }
+}
+
+/* ======================================================================= */
+
+/* DAEMON - graceful shutdown of the helper */
+
+void
+PRV_Finalise(void)
+{
+  if (!have_helper())
+    return;
+
+  stop_helper();
+  close(helper_fd);
+  helper_fd = -1;
+}

privops.h

@@ -0,0 +1,71 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Bryan Christianson 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  Perform privileged operations over a unix socket to a privileged fork.
+
+*/
+
+#ifndef GOT_PRIVOPS_H
+#define GOT_PRIVOPS_H
+
+#ifdef PRIVOPS_ADJUSTTIME
+int PRV_AdjustTime(const struct timeval *delta, struct timeval *olddelta);
+#else
+#define PRV_AdjustTime adjtime
+#endif
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+int PRV_AdjustTimex(struct timex *txc);
+#else
+#define PRV_AdjustTimex ntp_adjtime
+#endif
+
+#ifdef PRIVOPS_SETTIME
+int PRV_SetTime(const struct timeval *tp, const struct timezone *tzp);
+#else
+#define PRV_SetTime settimeofday
+#endif
+
+#ifdef PRIVOPS_BINDSOCKET
+int PRV_BindSocket(int sock, struct sockaddr *address, socklen_t address_len);
+#else
+#define PRV_BindSocket bind
+#endif
+
+#ifdef PRIVOPS_NAME2IPADDRESS
+int PRV_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs);
+#else
+#define PRV_Name2IPAddress DNS_Name2IPAddress
+#endif
+
+#ifdef PRIVOPS_HELPER
+void PRV_Initialise(void);
+void PRV_StartHelper(void);
+void PRV_Finalise(void);
+#else
+#define PRV_Initialise()
+#define PRV_StartHelper()
+#define PRV_Finalise()
+#endif
+
+#endif

refclock.c

@@ -87,7 +87,7 @@ 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;
@@ -114,13 +114,13 @@ 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 +148,7 @@ RCL_Finalise(void)
     filter_fini(&inst->filter);
     Free(inst->driver_parameter);
     SRC_DestroyInstance(inst->source);
+    Free(inst);
   }
 
   if (ARR_GetSize(refclocks) > 0) {
@@ -162,8 +163,10 @@ 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;
@@ -233,7 +236,7 @@ RCL_AddRefclock(RefclockParameters *params)
     if (index >= 10)
       ref[2] = (index / 10) % 10 + '0';
 
-    inst->ref_id = ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
+    inst->ref_id = (uint32_t)ref[0] << 24 | ref[1] << 16 | ref[2] << 8 | ref[3];
   }
 
   if (inst->driver->poll) {
@@ -260,7 +263,7 @@ RCL_AddRefclock(RefclockParameters *params)
 
   filter_init(&inst->filter, params->filter_length, params->max_dispersion);
 
-  inst->source = SRC_CreateNewInstance(inst->ref_id, SRC_REFCLOCK, params->sel_option, NULL,
+  inst->source = SRC_CreateNewInstance(inst->ref_id, SRC_REFCLOCK, params->sel_options, NULL,
                                        params->min_samples, params->max_samples);
 
   DEBUG_LOG(LOGF_Refclock, "refclock %s refid=%s poll=%d dpoll=%d filter=%d",
@@ -372,8 +375,6 @@ RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset,
       !valid_sample_time(instance, sample_time))
     return 0;
 
-  filter_add_sample(&instance->filter, &cooked_time, offset - correction + instance->offset, dispersion);
-
   switch (leap) {
     case LEAP_Normal:
     case LEAP_InsertSecond:
@@ -381,10 +382,11 @@ RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset,
       instance->leap_status = leap;
       break;
     default:
-      instance->leap_status = LEAP_Unsynchronised;
-      break;
+      DEBUG_LOG(LOGF_Refclock, "refclock sample ignored bad leap %d", leap);
+      return 0;
   }
 
+  filter_add_sample(&instance->filter, &cooked_time, offset - correction + instance->offset, dispersion);
   instance->pps_active = 0;
 
   log_sample(instance, &cooked_time, 0, 0, offset, offset - correction + instance->offset, dispersion);
@@ -471,15 +473,16 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
     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;
@@ -499,15 +502,6 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
   return 1;
 }
 
-static double
-poll_interval(int poll)
-{
-  if (poll >= 0)
-    return 1 << poll;
-  else
-    return 1.0 / (1 << -poll);
-}
-
 static int
 valid_sample_time(RCL_Instance instance, struct timeval *tv)
 {
@@ -516,7 +510,7 @@ valid_sample_time(RCL_Instance instance, struct timeval *tv)
 
   LCL_ReadRawTime(&raw_time);
   UTI_DiffTimevalsToDouble(&diff, &raw_time, tv);
-  if (diff < 0.0 || diff > poll_interval(instance->poll + 1)) {
+  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));
     return 0;
@@ -538,9 +532,10 @@ pps_stratum(RCL_Instance instance, struct timeval *tv)
   REF_GetReferenceParams(tv, &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 */ 
@@ -595,7 +590,7 @@ poll_timeout(void *arg)
     }
   }
 
-  inst->timeout_id = SCH_AddTimeoutByDelay(poll_interval(poll), poll_timeout, arg);
+  inst->timeout_id = SCH_AddTimeoutByDelay(UTI_Log2ToDouble(poll), poll_timeout, arg);
 }
 
 static void

refclock.h

@@ -40,13 +40,13 @@ typedef struct {
   int pps_rate;
   int min_samples;
   int max_samples;
+  int sel_options;
   uint32_t ref_id;
   uint32_t lock_ref_id;
   double offset;
   double delay;
   double precision;
   double max_dispersion;
-  SRC_SelectOption sel_option;
 } RefclockParameters;
 
 typedef struct RCL_Instance_Record *RCL_Instance;

refclock_sock.c

@@ -37,11 +37,23 @@
 #define SOCK_MAGIC 0x534f434b
 
 struct sock_sample {
+  /* Time of the measurement (system time) */
   struct timeval tv;
+
+  /* Offset between the true time and the system time (in seconds) */
   double offset;
+
+  /* Non-zero if the sample is from a PPS signal, i.e. another source
+     is needed to obtain seconds */
   int pulse;
+
+  /* 0 - normal, 1 - insert leap second, 2 - delete leap second */
   int leap;
+
+  /* Padding, ignored */
   int _pad;
+
+  /* Protocol identifier (0x534f434b) */
   int magic;
 };
 

reference.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2014
+ * 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
@@ -45,6 +45,8 @@
 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;
@@ -80,8 +82,7 @@ static int max_offset_delay;
 static int max_offset_ignore;
 static double max_offset;
 
-/* Flag and threshold for logging clock changes to syslog */
-static int do_log_change;
+/* Threshold for logging clock changes to syslog */
 static double log_change_threshold;
 
 /* Flag, threshold and user for sending mail notification on large clock changes */
@@ -106,7 +107,6 @@ static REF_LeapMode leap_mode;
 static int leap_in_progress;
 
 /* Timer for the leap second handler */
-static int leap_timer_running;
 static SCH_TimeoutID leap_timeout_id;
 
 /* Name of a system timezone containing leap seconds occuring at midnight */
@@ -120,11 +120,6 @@ static LOG_FileID logfileid;
 
 /* ================================================== */
 
-/* Reference ID supplied when we are locally referenced */
-#define LOCAL_REFERENCE_ID 0x7f7f0101UL
-
-/* ================================================== */
-
 /* Exponential moving averages of absolute clock frequencies
    used as a fallback when synchronisation is lost. */
 
@@ -237,9 +232,9 @@ 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_timer_running = 0;
+  leap_timeout_id = 0;
   leap_in_progress = 0;
   leap_mode = CNF_GetLeapSecMode();
   /* Switch to step mode if the system driver doesn't support leap */
@@ -248,9 +243,9 @@ REF_Initialise(void)
 
   leap_tzname = CNF_GetLeapSecTimezone();
   if (leap_tzname) {
-    /* Check that the timezone has good data for Jun 30 2008 and Dec 31 2008 */
-    if (get_tz_leap(1214784000) == LEAP_Normal &&
-        get_tz_leap(1230681600) == LEAP_InsertSecond) {
+    /* Check that the timezone has good data for Jun 30 2012 and Dec 31 2012 */
+    if (get_tz_leap(1341014400) == LEAP_InsertSecond &&
+        get_tz_leap(1356912000) == LEAP_Normal) {
       LOG(LOGS_INFO, LOGF_Reference, "Using %s timezone to obtain leap second data", leap_tzname);
     } else {
       LOG(LOGS_WARN, LOGF_Reference, "Timezone %s failed leap second check, ignoring", leap_tzname);
@@ -260,8 +255,8 @@ REF_Initialise(void)
 
   CNF_GetMakeStep(&make_step_limit, &make_step_threshold);
   CNF_GetMaxChange(&max_offset_delay, &max_offset_ignore, &max_offset);
-  CNF_GetLogChange(&do_log_change, &log_change_threshold);
   CNF_GetMailOnChange(&do_mail_change, &mail_change_threshold, &mail_change_user);
+  log_change_threshold = CNF_GetLogChange();
 
   CNF_GetFallbackDrifts(&fb_drift_min, &fb_drift_max);
 
@@ -269,7 +264,7 @@ REF_Initialise(void)
     fb_drifts = MallocArray(struct fb_drift, fb_drift_max - fb_drift_min + 1);
     memset(fb_drifts, 0, sizeof (struct fb_drift) * (fb_drift_max - fb_drift_min + 1));
     next_fb_drift = 0;
-    fb_drift_timeout_id = -1;
+    fb_drift_timeout_id = 0;
   }
 
   last_ref_update.tv_sec = 0;
@@ -278,11 +273,6 @@ REF_Initialise(void)
 
   LCL_AddParameterChangeHandler(handle_slew, NULL);
 
-  /* And just to prevent anything wierd ... */
-  if (do_log_change) {
-    log_change_threshold = fabs(log_change_threshold);
-  }
-
   /* Make first entry in tracking log */
   REF_SetUnsynchronised();
 }
@@ -433,10 +423,8 @@ update_fb_drifts(double freq_ppm, double update_interval)
     next_fb_drift = 0;
   }
 
-  if (fb_drift_timeout_id != -1) {
-    SCH_RemoveTimeout(fb_drift_timeout_id);
-    fb_drift_timeout_id = -1;
-  }
+  SCH_RemoveTimeout(fb_drift_timeout_id);
+  fb_drift_timeout_id = 0;
 
   if (update_interval < 1.0 || update_interval > last_ref_update_interval * 4.0)
     return;
@@ -469,7 +457,7 @@ fb_drift_timeout(void *arg)
 {
   assert(next_fb_drift >= fb_drift_min && next_fb_drift <= fb_drift_max);
 
-  fb_drift_timeout_id = -1;
+  fb_drift_timeout_id = 0;
 
   DEBUG_LOG(LOGF_Reference, "Fallback drift %d active: %f ppm",
             next_fb_drift, fb_drifts[next_fb_drift - fb_drift_min].freq);
@@ -486,7 +474,7 @@ schedule_fb_drift(struct timeval *now)
   double unsynchronised;
   struct timeval when;
 
-  if (fb_drift_timeout_id != -1)
+  if (fb_drift_timeout_id)
     return; /* already scheduled */
 
   UTI_DiffTimevalsToDouble(&unsynchronised, now, &last_ref_update);
@@ -544,8 +532,7 @@ maybe_log_offset(double offset, time_t now)
 
   abs_offset = fabs(offset);
 
-  if (do_log_change &&
-      (abs_offset > log_change_threshold)) {
+  if (abs_offset > log_change_threshold) {
     LOG(LOGS_WARN, LOGF_Reference,
         "System clock wrong by %.6f seconds, adjustment started",
         -offset);
@@ -691,7 +678,7 @@ get_tz_leap(time_t when)
 static void
 leap_end_timeout(void *arg)
 {
-  leap_timer_running = 0;
+  leap_timeout_id = 0;
   leap_in_progress = 0;
   our_leap_sec = 0;
 
@@ -743,11 +730,9 @@ set_leap_timeout(time_t now)
   struct timeval when;
 
   /* Stop old timer if there is one */
-  if (leap_timer_running) {
-    SCH_RemoveTimeout(leap_timeout_id);
-    leap_timer_running = 0;
-    leap_in_progress = 0;
-  }
+  SCH_RemoveTimeout(leap_timeout_id);
+  leap_timeout_id = 0;
+  leap_in_progress = 0;
 
   if (!our_leap_sec)
     return;
@@ -765,7 +750,6 @@ set_leap_timeout(time_t now)
   }
 
   leap_timeout_id = SCH_AddTimeout(&when, leap_start_timeout, NULL);
-  leap_timer_running = 1;
 }
 
 /* ================================================== */
@@ -794,7 +778,7 @@ update_leap_status(NTP_Leap leap, time_t now, int reset)
     }
   }
   
-  if (reset || (leap_sec != our_leap_sec && !REF_IsLeapSecondClose())) {
+  if (leap_sec != our_leap_sec && !REF_IsLeapSecondClose()) {
     our_leap_sec = leap_sec;
 
     switch (leap_mode) {
@@ -810,6 +794,8 @@ update_leap_status(NTP_Leap leap, time_t now, int reset)
         assert(0);
         break;
     }
+  } else if (reset) {
+    set_leap_timeout(now);
   }
 
   our_leap_status = leap;
@@ -1109,12 +1095,10 @@ REF_SetManualReference
  double skew
 )
 {
-  uint32_t manual_refid = 0x4D414E55; /* MANU */
-
   /* We are not synchronised to an external source, as such.  This is
-   only supposed to be used with the local source option, really
-   ... */
-  REF_SetReference(0, LEAP_Unsynchronised, 1, manual_refid, NULL,
+     only supposed to be used with the local source option, really.
+     Log as MANU in the tracking log, packets will have NTP_REFID_LOCAL. */
+  REF_SetReference(0, LEAP_Unsynchronised, 1, 0x4D414E55UL, NULL,
                    ref_time, offset, 0.0, frequency, skew, 0.0, 0.0);
 }
 
@@ -1175,32 +1159,40 @@ REF_GetReferenceParams
  double *root_dispersion
 )
 {
-  double elapsed;
-  double extra_dispersion;
+  double elapsed, dispersion;
 
   assert(initialised);
 
   if (are_we_synchronised) {
+    UTI_DiffTimevalsToDouble(&elapsed, 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 = LOCAL_REFERENCE_ID;
+    *ref_id = NTP_REFID_LOCAL;
     /* Make the reference time be now less a second - this will
        scarcely affect the client, but will ensure that the transmit
        timestamp cannot come before this (which would cause test 7 to
@@ -1222,7 +1214,7 @@ REF_GetReferenceParams
 
     *leap_status = LEAP_Unsynchronised;
     *stratum = NTP_MAX_STRATUM;
-    *ref_id = 0;
+    *ref_id = NTP_REFID_UNSYNC;
     ref_time->tv_sec = ref_time->tv_usec = 0;
     /* These values seem to be standard for a client, and
        any peer or client of ours will ignore them anyway because
@@ -1238,13 +1230,27 @@ REF_GetReferenceParams
 int
 REF_GetOurStratum(void)
 {
-  if (are_we_synchronised) {
-    return our_stratum;
-  } else if (enable_local_stratum) {
-    return local_stratum;
-  } else {
+  struct timeval 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;
 }
 
 /* ================================================== */
@@ -1275,10 +1281,12 @@ 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;
 }
 
 /* ================================================== */
@@ -1291,14 +1299,6 @@ REF_DisableLocal(void)
 
 /* ================================================== */
 
-int
-REF_IsLocalActive(void)
-{
-  return !are_we_synchronised && enable_local_stratum;
-}
-
-/* ================================================== */
-
 #define LEAP_SECOND_CLOSE 5
 
 int REF_IsLeapSecondClose(void)
@@ -1327,52 +1327,34 @@ int REF_IsLeapSecondClose(void)
 void
 REF_GetTrackingReport(RPT_TrackingReport *rep)
 {
-  double elapsed;
-  double extra_dispersion;
   struct timeval 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);
 
-  rep->ref_id = 0;
+  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->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 = LOCAL_REFERENCE_ID;
-    rep->ip_addr.family = IPADDR_UNSPEC;
-    rep->stratum = local_stratum;
-    rep->ref_time = now_cooked;
-    rep->root_dispersion = LCL_GetSysPrecisionAsQuantum();
   }
-
 }

reference.h

@@ -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 */

reports.h

@@ -29,6 +29,7 @@
 
 #include "sysincl.h"
 #include "addressing.h"
+#include "ntp.h"
 
 #define REPORT_INVALID_OFFSET 0x80000000
 
@@ -38,7 +39,7 @@ typedef struct {
   int poll;
   enum {RPT_NTP_CLIENT, RPT_NTP_PEER, RPT_LOCAL_REFERENCE} mode;
   enum {RPT_SYNC, RPT_UNREACH, RPT_FALSETICKER, RPT_JITTERY, RPT_CANDIDATE, RPT_OUTLIER} state;
-  enum {RPT_NORMAL, RPT_PREFER, RPT_NOSELECT} sel_option;
+  int sel_options;
 
   int reachability;
   unsigned long latest_meas_ago; /* seconds */
@@ -50,8 +51,8 @@ typedef struct {
 typedef struct {
   uint32_t ref_id;
   IPAddr ip_addr;
-  unsigned long stratum;
-  unsigned long leap_status;
+  int stratum;
+  NTP_Leap leap_status;
   struct timeval ref_time;
   double current_correction;
   double last_offset;
@@ -88,15 +89,25 @@ typedef struct {
 
 typedef struct {
   IPAddr ip_addr;
-  unsigned long client_hits;
-  unsigned long peer_hits;
-  unsigned long cmd_hits_auth;
-  unsigned long cmd_hits_normal;
-  unsigned long cmd_hits_bad;
-  unsigned long last_ntp_hit_ago;
-  unsigned long last_cmd_hit_ago;
+  uint32_t ntp_hits;
+  uint32_t cmd_hits;
+  uint16_t ntp_drops;
+  uint16_t cmd_drops;
+  int8_t ntp_interval;
+  int8_t cmd_interval;
+  int8_t ntp_timeout_interval;
+  uint32_t last_ntp_hit_ago;
+  uint32_t last_cmd_hit_ago;
 } RPT_ClientAccessByIndex_Report;
 
+typedef struct {
+  uint32_t ntp_hits;
+  uint32_t cmd_hits;
+  uint32_t ntp_drops;
+  uint32_t cmd_drops;
+  uint32_t log_drops;
+} RPT_ServerStatsReport;
+
 typedef struct {
   struct timeval when;
   double slewed_offset;
@@ -112,4 +123,14 @@ typedef struct {
   int unresolved;
 } RPT_ActivityReport;
 
+typedef struct {
+  int active;
+  int leap_only;
+  double offset;
+  double freq_ppm;
+  double wander_ppm;
+  double last_update_ago;
+  double remaining_time;
+} RPT_SmoothingReport;
+
 #endif /* GOT_REPORTS_H */

rtc.c

@@ -39,11 +39,12 @@
 /* ================================================== */
 
 static int driver_initialised = 0;
+static int driver_preinit_ok = 0;
 
 static struct {
   int  (*init)(void);
   void (*fini)(void);
-  int  (*time_pre_init)(void);
+  int  (*time_pre_init)(time_t driftfile_time);
   void (*time_init)(void (*after_hook)(void*), void *anything);
   void (*start_measurements)(void);
   int  (*write_parameters)(void);
@@ -73,29 +74,37 @@ static struct {
 };
      
 /* ================================================== */
-/* Set the system clock to the time of last modification of driftfile
-   if it's in the future */
+/* Get the last modification time of the driftfile */
 
-static void
-fallback_time_init(void)
+static time_t
+get_driftfile_time(void)
 {
-  struct timeval now;
   struct stat buf;
   char *drift_file;
 
   drift_file = CNF_GetDriftFile();
   if (!drift_file)
-    return;
+    return 0;
 
   if (stat(drift_file, &buf))
-    return;
+    return 0;
+
+  return buf.st_mtime;
+}
+
+/* ================================================== */
+/* Set the system time to the driftfile time if it's in the future */
+
+static void
+apply_driftfile_time(time_t t)
+{
+  struct timeval now;
 
   LCL_ReadCookedTime(&now, NULL);
 
-  if (now.tv_sec < buf.st_mtime) {
-    if (LCL_ApplyStepOffset(now.tv_sec - buf.st_mtime))
-      LOG(LOGS_INFO, LOGF_Rtc, "System clock set from driftfile %s",
-          drift_file);
+  if (now.tv_sec < t) {
+    if (LCL_ApplyStepOffset(now.tv_sec - t))
+      LOG(LOGS_INFO, LOGF_Rtc, "System time restored from driftfile");
   }
 }
 
@@ -104,15 +113,24 @@ fallback_time_init(void)
 void
 RTC_Initialise(int initial_set)
 {
+  time_t driftfile_time;
   char *file_name;
 
-  /* Do an initial read of the RTC and set the system time to it.  This
-     is analogous to what /sbin/hwclock -s would do on Linux.  If that fails
-     or RTC is not supported, set the clock to the time of the last
-     modification of driftfile, so we at least get closer to the truth. */
+  /* If the -s option was specified, try to do an initial read of the RTC and
+     set the system time to it.  Also, read the last modification time of the
+     driftfile (i.e. system time when chronyd was previously stopped) and set
+     the system time to it if it's in the future to bring the clock closer to
+     the true time when the RTC is broken (e.g. it has no battery), is missing,
+     or there is no RTC driver. */
   if (initial_set) {
-    if (!driver.time_pre_init || !driver.time_pre_init()) {
-      fallback_time_init();
+    driftfile_time = get_driftfile_time();
+
+    if (driver.time_pre_init && driver.time_pre_init(driftfile_time)) {
+      driver_preinit_ok = 1;
+    } else {
+      driver_preinit_ok = 0;
+      if (driftfile_time)
+        apply_driftfile_time(driftfile_time);
     }
   }
 
@@ -150,9 +168,9 @@ RTC_Finalise(void)
 /* ================================================== */
 /* Start the processing to get a single measurement from the real time
    clock, and use it to trim the system time, based on knowing the
-   drift rate of the RTC and the error the last time we set it.  The
-   TimePreInit routine has already run, so we can be sure that the
-   trim required is not *too* large.
+   drift rate of the RTC and the error the last time we set it.  If the
+   TimePreInit routine has succeeded, we can be sure that the trim required
+   is not *too* large.
 
    We are called with a hook to a function to be called after the
    initialisation is complete.  We also call this if we cannot do the
@@ -161,7 +179,7 @@ RTC_Finalise(void)
 void
 RTC_TimeInit(void (*after_hook)(void *), void *anything)
 {
-  if (driver_initialised) {
+  if (driver_initialised && driver_preinit_ok) {
     (driver.time_init)(after_hook, anything);
   } else {
     (after_hook)(anything);

rtc_linux.c

@@ -72,8 +72,7 @@ static int fd = -1;
 
 static int measurement_period = LOWEST_MEASUREMENT_PERIOD;
 
-static int timeout_running = 0;
-static SCH_TimeoutID timeout_id;
+static SCH_TimeoutID timeout_id = 0;
 
 static int skip_interrupts;
 
@@ -367,6 +366,9 @@ t_from_rtc(struct tm *stm) {
   t2 = mktime(&temp2);
   diff = t2 - t1;
 
+  if (t1 - diff == -1)
+    DEBUG_LOG(LOGF_RtcLinux, "Could not convert RTC time");
+
   return t1 - diff;
 }
 
@@ -379,13 +381,13 @@ read_hwclock_file(const char *hwclock_file)
   char line[256];
   int i;
 
-  if (!hwclock_file)
+  if (!hwclock_file || !hwclock_file[0])
     return;
 
   in = fopen(hwclock_file, "r");
   if (!in) {
-    LOG(LOGS_WARN, LOGF_RtcLinux, "Could not open hwclockfile %s",
-        hwclock_file);
+    LOG(LOGS_WARN, LOGF_RtcLinux, "Could not open %s : %s",
+        hwclock_file, strerror(errno));
     return;
   }
 
@@ -402,7 +404,7 @@ read_hwclock_file(const char *hwclock_file)
   } else if (i == 3 && !strncmp(line, "UTC", 3)) {
     rtc_on_utc = 1;
   } else {
-    LOG(LOGS_WARN, LOGF_RtcLinux, "Could not read LOCAL/UTC setting from hwclockfile %s",
+    LOG(LOGS_WARN, LOGF_RtcLinux, "Could not read RTC LOCAL/UTC setting from %s",
         hwclock_file);
   }
 }
@@ -445,7 +447,7 @@ read_coefs_from_file(void)
                  &file_ref_offset,
                  &file_rate_ppm) == 4) {
       } else {
-        LOG(LOGS_WARN, LOGF_RtcLinux, "Could not read coefficients from RTC file %s",
+        LOG(LOGS_WARN, LOGF_RtcLinux, "Could not read coefficients from %s",
             coefs_file_name);
       }
       fclose(in);
@@ -578,10 +580,8 @@ RTC_Linux_Initialise(void)
 void
 RTC_Linux_Finalise(void)
 {
-  if (timeout_running) {
-    SCH_RemoveTimeout(timeout_id);
-    timeout_running = 0;
-  }
+  SCH_RemoveTimeout(timeout_id);
+  timeout_id = 0;
 
   /* Remove input file handler */
   if (fd >= 0) {
@@ -607,14 +607,16 @@ switch_interrupts(int onoff)
   if (onoff) {
     status = ioctl(fd, RTC_UIE_ON, 0);
     if (status < 0) {
-      LOG(LOGS_ERR, LOGF_RtcLinux, "Could not start measurement : %s", strerror(errno));
+      LOG(LOGS_ERR, LOGF_RtcLinux, "Could not %s RTC interrupt : %s",
+          "enable", strerror(errno));
       return;
     }
     skip_interrupts = 1;
   } else {
     status = ioctl(fd, RTC_UIE_OFF, 0);
     if (status < 0) {
-      LOG(LOGS_ERR, LOGF_RtcLinux, "Could not stop measurement : %s", strerror(errno));
+      LOG(LOGS_ERR, LOGF_RtcLinux, "Could not %s RTC interrupt : %s",
+          "disable", strerror(errno));
       return;
     }
   }
@@ -625,7 +627,7 @@ switch_interrupts(int onoff)
 static void
 measurement_timeout(void *any)
 {
-  timeout_running = 0;
+  timeout_id = 0;
   switch_interrupts(1);
 }
 
@@ -694,10 +696,11 @@ handle_initial_trim(void)
     /* sys_error_now is positive if the system clock is fast */
     sys_error_now = rtc_error_now - coef_seconds_fast;
           
-    LOG(LOGS_INFO, LOGF_RtcLinux, "System trim from RTC = %f", sys_error_now);
     LCL_AccumulateOffset(sys_error_now, 0.0);
+    LOG(LOGS_INFO, LOGF_RtcLinux, "System clock off from RTC by %f seconds (slew)",
+        sys_error_now);
   } else {
-    LOG(LOGS_WARN, LOGF_RtcLinux, "No valid file coefficients, cannot trim system time");
+    LOG(LOGS_WARN, LOGF_RtcLinux, "No valid rtcfile coefficients");
   }
   
   coefs_valid = 0;
@@ -722,7 +725,7 @@ handle_relock_after_trim(void)
   if (valid) {
     write_coefs_to_file(1,ref,fast,saved_coef_gain_rate);
   } else {
-    LOG(LOGS_WARN, LOGF_RtcLinux, "Could not do regression after trim");
+    DEBUG_LOG(LOGF_RtcLinux, "Could not do regression after trim");
   }
 
   coefs_valid = 0;
@@ -857,7 +860,6 @@ read_from_device(void *any)
     rtc_t = t_from_rtc(&rtc_tm);
 
     if (rtc_t == (time_t)(-1)) {
-      LOG(LOGS_ERR, LOGF_RtcLinux, "Could not convert RTC time to timeval");
       error = 1;
       goto turn_off_interrupt;
     }      
@@ -883,13 +885,12 @@ turn_off_interrupt:
   switch (operating_mode) {
     case OM_INITIAL:
       if (error) {
-        LOG(LOGS_WARN, LOGF_RtcLinux, "Could not complete initial step due to errors");
+        DEBUG_LOG(LOGF_RtcLinux, "Could not complete initial step due to errors");
         operating_mode = OM_NORMAL;
         (after_init_hook)(after_init_hook_arg);
 
         switch_interrupts(0);
     
-        timeout_running = 1;
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
 
@@ -897,12 +898,11 @@ turn_off_interrupt:
 
     case OM_AFTERTRIM:
       if (error) {
-        LOG(LOGS_WARN, LOGF_RtcLinux, "Could not complete after trim relock due to errors");
+        DEBUG_LOG(LOGF_RtcLinux, "Could not complete after trim relock due to errors");
         operating_mode = OM_NORMAL;
 
         switch_interrupts(0);
     
-        timeout_running = 1;
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
       
@@ -911,7 +911,6 @@ turn_off_interrupt:
     case OM_NORMAL:
       switch_interrupts(0);
     
-      timeout_running = 1;
       timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
 
       break;
@@ -931,9 +930,8 @@ RTC_Linux_TimeInit(void (*after_hook)(void *), void *anything)
   after_init_hook_arg = anything;
 
   operating_mode = OM_INITIAL;
-  timeout_running = 0;
+  timeout_id = 0;
   switch_interrupts(1);
-
 }
 
 /* ================================================== */
@@ -941,7 +939,6 @@ RTC_Linux_TimeInit(void (*after_hook)(void *), void *anything)
 void
 RTC_Linux_StartMeasurements(void)
 {
-  timeout_running = 0;
   measurement_timeout(NULL);
 }
 
@@ -974,7 +971,7 @@ RTC_Linux_WriteParameters(void)
    RTC behaviour than we do for the rest of the module. */
 
 int
-RTC_Linux_TimePreInit(void)
+RTC_Linux_TimePreInit(time_t driftfile_time)
 {
   int fd, status;
   struct rtc_time rtc_raw, rtc_raw_retry;
@@ -1039,18 +1036,23 @@ RTC_Linux_TimePreInit(void)
 
       UTI_AddDoubleToTimeval(&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);
 
       /* Set system time only if the step is larger than 1 second */
       if (fabs(sys_offset) >= 1.0) {
         if (LCL_ApplyStepOffset(sys_offset))
-          LOG(LOGS_INFO, LOGF_RtcLinux, "Set system time, error in RTC = %f",
-              accumulated_error);
+          LOG(LOGS_INFO, LOGF_RtcLinux, "System time set from RTC");
       }
     } else {
-      LOG(LOGS_WARN, LOGF_RtcLinux, "Could not convert RTC reading to seconds since 1/1/1970");
       return 0;
     }
+  } else {
+    return 0;
   }
 
   return 1;
@@ -1090,7 +1092,8 @@ RTC_Linux_Trim(void)
 
   if (fabs(coef_seconds_fast) > 1.0) {
 
-    LOG(LOGS_INFO, LOGF_RtcLinux, "Trimming RTC, error = %.3f seconds", coef_seconds_fast);
+    LOG(LOGS_INFO, LOGF_RtcLinux, "RTC wrong by %.3f seconds (step)",
+        coef_seconds_fast);
 
     /* Do processing to set clock.  Let R be the value we set the
        RTC to, then in 500ms the RTC ticks (R+1) (see comments in
@@ -1115,10 +1118,8 @@ RTC_Linux_Trim(void)
     coef_ref_time = now.tv_sec;
 
     /* And start rapid sampling, interrupts on now */
-    if (timeout_running) {
-      SCH_RemoveTimeout(timeout_id);
-      timeout_running = 0;
-    }
+    SCH_RemoveTimeout(timeout_id);
+    timeout_id = 0;
     switch_interrupts(1);
   }
 

rtc_linux.h

@@ -30,7 +30,7 @@
 
 extern int RTC_Linux_Initialise(void);
 extern void RTC_Linux_Finalise(void);
-extern int RTC_Linux_TimePreInit(void);
+extern int RTC_Linux_TimePreInit(time_t driftile_time);
 extern void RTC_Linux_TimeInit(void (*after_hook)(void *), void *anything);
 extern void RTC_Linux_StartMeasurements(void);
 

sched.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011, 2013-2014
+ * Copyright (C) Miroslav Lichvar  2011, 2013-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -150,8 +150,6 @@ SCH_Initialise(void)
   LCL_ReadRawTime(&last_select_ts_raw);
   last_select_ts = last_select_ts_raw;
 
-  srandom(last_select_ts.tv_sec << 16 ^ last_select_ts.tv_usec);
-
   initialised = 1;
 }
 
@@ -181,7 +179,8 @@ SCH_AddInputFileHandler
   /* 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));
+  if (FD_ISSET(fd, &read_fds))
+    assert(0);
 
   ++n_read_fds;
   
@@ -210,7 +209,8 @@ SCH_RemoveInputFileHandler(int fd)
   assert(initialised);
 
   /* Check that a handler was registered for the fd in question */
-  assert(FD_ISSET(fd, &read_fds));
+  if (!FD_ISSET(fd, &read_fds))
+    assert(0);
 
   --n_read_fds;
 
@@ -278,6 +278,26 @@ release_tqe(TimerQueueEntry *node)
 
 /* ================================================== */
 
+static SCH_TimeoutID
+get_new_tqe_id(void)
+{
+  TimerQueueEntry *ptr;
+
+try_again:
+  next_tqe_id++;
+  if (!next_tqe_id)
+    goto try_again;
+
+  /* Make sure the ID isn't already used */
+  for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next)
+    if (ptr->id == next_tqe_id)
+      goto try_again;
+
+  return next_tqe_id;
+}
+
+/* ================================================== */
+
 SCH_TimeoutID
 SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg)
 {
@@ -288,7 +308,7 @@ SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler handler, SCH_ArbitraryArgu
 
   new_tqe = allocate_tqe();
 
-  new_tqe->id = next_tqe_id++;
+  new_tqe->id = get_new_tqe_id();
   new_tqe->handler = handler;
   new_tqe->arg = arg;
   new_tqe->tv = *tv;
@@ -330,6 +350,10 @@ SCH_AddTimeoutByDelay(double delay, SCH_TimeoutHandler handler, SCH_ArbitraryArg
 
   LCL_ReadRawTime(&now);
   UTI_AddDoubleToTimeval(&now, delay, &then);
+  if (UTI_CompareTimevals(&now, &then) > 0) {
+    LOG_FATAL(LOGF_Scheduler, "Timeout overflow");
+  }
+
   return SCH_AddTimeout(&then, handler, arg);
 
 }
@@ -352,7 +376,10 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   assert(class < SCH_NumberOfClasses);
 
   if (randomness > 0.0) {
-    r = random() % 0xffff / (0xffff - 1.0) * randomness + 1.0;
+    uint16_t rnd;
+
+    UTI_GetRandomBytes(&rnd, sizeof (rnd));
+    r = rnd / (double)0xffff * randomness + 1.0;
     min_delay *= r;
     separation *= r;
   }
@@ -393,7 +420,7 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
   /* We have located the insertion point */
   new_tqe = allocate_tqe();
 
-  new_tqe->id = next_tqe_id++;
+  new_tqe->id = get_new_tqe_id();
   new_tqe->handler = handler;
   new_tqe->arg = arg;
   UTI_AddDoubleToTimeval(&now, new_min_delay, &new_tqe->tv);
@@ -417,6 +444,9 @@ SCH_RemoveTimeout(SCH_TimeoutID id)
 
   assert(initialised);
 
+  if (!id)
+    return;
+
   for (ptr = timer_queue.next; ptr != &timer_queue; ptr = ptr->next) {
 
     if (ptr->id == id) {
@@ -432,9 +462,12 @@ SCH_RemoveTimeout(SCH_TimeoutID id)
       /* Release memory back to the operating system */
       release_tqe(ptr);
 
-      break;
+      return;
     }
   }
+
+  /* Catch calls with invalid non-zero ID */
+  assert(0);
 }
 
 /* ================================================== */
@@ -686,7 +719,6 @@ SCH_MainLoop(void)
 void
 SCH_QuitProgram(void)
 {
-  assert(initialised);
   need_to_exit = 1;
 }
 

sched.h

@@ -29,7 +29,8 @@
 
 #include "sysincl.h"
 
-typedef unsigned long SCH_TimeoutID;
+/* Type for timeout IDs, valid IDs are always greater than zero */
+typedef unsigned int SCH_TimeoutID;
 
 typedef enum {
   SCH_ReservedTimeoutValue = 0,

smooth.c

@@ -77,6 +77,10 @@ static struct stage stages[NUM_STAGES];
 /* Enabled/disabled smoothing */
 static int enabled;
 
+/* Enabled/disabled mode where only leap seconds are smoothed out and normal
+   offset/frequency changes are ignored */
+static int leap_only_mode;
+
 /* Maximum skew/max_wander ratio to start updating offset and frequency */
 #define UNLOCK_SKEW_WANDER_RATIO 10000
 
@@ -93,15 +97,17 @@ static struct timeval last_update;
 
 
 static void
-get_offset_freq(struct timeval *now, double *offset, double *freq)
+get_smoothing(struct timeval *now, double *poffset, double *pfreq,
+              double *pwander)
 {
-  double elapsed, length;
+  double elapsed, length, offset, freq, wander;
   int i;
 
   UTI_DiffTimevalsToDouble(&elapsed, now, &last_update);
 
-  *offset = smooth_offset;
-  *freq = smooth_freq;
+  offset = smooth_offset;
+  freq = smooth_freq;
+  wander = 0.0;
 
   for (i = 0; i < NUM_STAGES; i++) {
     if (elapsed <= 0.0)
@@ -111,13 +117,21 @@ get_offset_freq(struct timeval *now, double *offset, double *freq)
     if (length >= elapsed)
       length = elapsed;
 
-    *offset -= length * (2.0 * *freq + stages[i].wander * length) / 2.0;
-    *freq += stages[i].wander * length;
+    wander = stages[i].wander;
+    offset -= length * (2.0 * freq + wander * length) / 2.0;
+    freq += wander * length;
     elapsed -= length;
   }
 
-  if (elapsed > 0.0)
-    *offset -= elapsed * *freq;
+  if (elapsed > 0.0) {
+    wander = 0.0;
+    offset -= elapsed * freq;
+  }
+
+  *poffset = offset;
+  *pfreq = freq;
+  if (pwander)
+    *pwander = wander;
 }
 
 static void
@@ -185,14 +199,12 @@ update_smoothing(struct timeval *now, double offset, double freq)
 {
   /* Don't accept offset/frequency until the clock has stabilized */
   if (locked) {
-    if (REF_GetSkew() / max_wander < UNLOCK_SKEW_WANDER_RATIO) {
-      LOG(LOGS_INFO, LOGF_Smooth, "Time smoothing activated");
-      locked = 0;
-    }
+    if (REF_GetSkew() / max_wander < UNLOCK_SKEW_WANDER_RATIO || leap_only_mode)
+      SMT_Activate(now);
     return;
   }
 
-  get_offset_freq(now, &smooth_offset, &smooth_freq);
+  get_smoothing(now, &smooth_offset, &smooth_freq, NULL);
   smooth_offset += offset;
   smooth_freq = (smooth_freq - freq) / (1.0 - freq);
   last_update = *now;
@@ -208,15 +220,19 @@ handle_slew(struct timeval *raw, struct timeval *cooked, double dfreq,
 {
   double delta;
 
-  if (change_type == LCL_ChangeAdjust)
-    update_smoothing(cooked, doffset, dfreq);
+  if (change_type == LCL_ChangeAdjust) {
+    if (leap_only_mode)
+      update_smoothing(cooked, 0.0, 0.0);
+    else
+      update_smoothing(cooked, doffset, dfreq);
+  }
 
   UTI_AdjustTimeval(&last_update, cooked, &last_update, &delta, dfreq, doffset);
 }
 
 void SMT_Initialise(void)
 {
-  CNF_GetSmooth(&max_freq, &max_wander);
+  CNF_GetSmooth(&max_freq, &max_wander, &leap_only_mode);
   if (max_freq <= 0.0 || max_wander <= 0.0) {
       enabled = 0;
       return;
@@ -249,19 +265,78 @@ SMT_GetOffset(struct timeval *now)
   if (!enabled)
     return 0.0;
   
-  get_offset_freq(now, &offset, &freq);
+  get_smoothing(now, &offset, &freq, NULL);
 
   return offset;
 }
 
+void
+SMT_Activate(struct timeval *now)
+{
+  if (!enabled || !locked)
+    return;
+
+  LOG(LOGS_INFO, LOGF_Smooth, "Time smoothing activated%s", leap_only_mode ?
+      " (leap seconds only)" : "");
+  locked = 0;
+  last_update = *now;
+}
+
 void
 SMT_Reset(struct timeval *now)
 {
+  int i;
+
   if (!enabled)
     return;
 
-  locked = 1;
   smooth_offset = 0.0;
   smooth_freq = 0.0;
   last_update = *now;
+
+  for (i = 0; i < NUM_STAGES; i++)
+    stages[i].wander = stages[i].length = 0.0;
+}
+
+void
+SMT_Leap(struct timeval *now, int leap)
+{
+  /* When the leap-only mode is disabled, the leap second will be accumulated
+     in handle_slew() as a normal offset */
+  if (!enabled || !leap_only_mode)
+    return;
+
+  update_smoothing(now, leap, 0.0);
+}
+
+int
+SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timeval *now)
+{
+  double length, elapsed;
+  int i;
+
+  if (!enabled)
+    return 0;
+
+  report->active = !locked;
+  report->leap_only = leap_only_mode;
+
+  get_smoothing(now, &report->offset, &report->freq_ppm, &report->wander_ppm);
+
+  /* Convert to ppm and negate (positive values mean faster/speeding up) */
+  report->freq_ppm *= -1.0e6;
+  report->wander_ppm *= -1.0e6;
+
+  UTI_DiffTimevalsToDouble(&elapsed, now, &last_update);
+  if (!locked && elapsed >= 0.0) {
+    for (i = 0, length = 0.0; i < NUM_STAGES; i++)
+      length += stages[i].length;
+    report->last_update_ago = elapsed;
+    report->remaining_time = elapsed < length ? length - elapsed : 0.0;
+  } else {
+    report->last_update_ago = 0.0;
+    report->remaining_time = 0.0;
+  }
+
+  return 1;
 }

smooth.h

@@ -27,6 +27,8 @@
 #ifndef GOT_SMOOTH_H
 #define GOT_SMOOTH_H
 
+#include "reports.h"
+
 extern void SMT_Initialise(void);
 
 extern void SMT_Finalise(void);
@@ -35,6 +37,12 @@ extern int SMT_IsEnabled(void);
 
 extern double SMT_GetOffset(struct timeval *now);
 
+extern void SMT_Activate(struct timeval *now);
+
 extern void SMT_Reset(struct timeval *now);
 
+extern void SMT_Leap(struct timeval *now, int leap);
+
+extern int SMT_GetSmoothingReport(RPT_SmoothingReport *report, struct timeval *now);
+
 #endif

sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2014
+ * Copyright (C) Miroslav Lichvar  2011-2016
  * 
  * 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
@@ -44,7 +44,6 @@
 #include "logging.h"
 #include "reports.h"
 #include "nameserv.h"
-#include "mkdirpp.h"
 #include "sched.h"
 #include "regress.h"
 
@@ -71,8 +70,10 @@ typedef enum {
   SRC_OK,               /* OK so far, not a final status! */
   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_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_FALSETICKER,      /* Doesn't agree with others */
   SRC_JITTERY,          /* Scatter worse than other's dispersion (not used) */
   SRC_WAITS_SOURCES,    /* Not enough sources, selection postponed */
@@ -118,7 +119,7 @@ struct SRC_Instance_Record {
   SRC_Type type;
 
   /* Options used when selecting sources */ 
-  SRC_SelectOption sel_option;
+  int sel_options;
 
   /* Score against currently selected source */
   double sel_score;
@@ -156,6 +157,7 @@ static int selected_source_index; /* Which source index is currently
 /* Number of updates needed to reset the distant status */
 #define DISTANT_PENALTY 32
 
+static double max_distance;
 static double reselect_distance;
 static double stratum_weight;
 static double combine_limit;
@@ -180,6 +182,7 @@ void SRC_Initialise(void) {
   n_sources = 0;
   max_n_sources = 0;
   selected_source_index = INVALID_SOURCE;
+  max_distance = CNF_GetMaxDistance();
   reselect_distance = CNF_GetReselectDistance();
   stratum_weight = CNF_GetStratumWeight();
   combine_limit = CNF_GetCombineLimit();
@@ -207,7 +210,7 @@ void SRC_Finalise(void)
 /* Function to create a new instance.  This would be called by one of
    the individual source-type instance creation routines. */
 
-SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, SRC_SelectOption sel_option, IPAddr *addr, int min_samples, int max_samples)
+SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_options, IPAddr *addr, int min_samples, int max_samples)
 {
   SRC_Instance result;
 
@@ -239,7 +242,7 @@ SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, SRC_SelectOpt
 
   result->index = n_sources;
   result->type = type;
-  result->sel_option = sel_option;
+  result->sel_options = sel_options;
 
   SRC_SetRefid(result, ref_id, addr);
   SRC_ResetInstance(result);
@@ -412,7 +415,7 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
 {
   inst->reachability <<= 1;
   inst->reachability |= !!reachable;
-  inst->reachability &= ~(-1 << SOURCE_REACH_BITS);
+  inst->reachability %= 1U << SOURCE_REACH_BITS;
 
   if (inst->reachability_size < SOURCE_REACH_BITS)
       inst->reachability_size++;
@@ -427,9 +430,11 @@ 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 larger than the allowed maximum */
+  if (inst->type == SRC_NTP &&
+      ((!inst->reachability && inst->reachability_size == SOURCE_REACH_BITS) ||
+       inst->status == SRC_FALSETICKER || inst->status == SRC_BAD_DISTANCE)) {
     NSR_HandleBadSource(inst->ip_addr);
   }
 }
@@ -513,7 +518,7 @@ combine_sources(int n_sel_sources, struct timeval *ref_time, double *offset,
 {
   struct timeval src_ref_time;
   double src_offset, src_offset_sd, src_frequency, src_skew;
-  double src_root_delay, src_root_dispersion, elapsed;
+  double src_root_delay, src_root_dispersion, sel_src_distance, elapsed;
   double offset_weight, sum_offset_weight, sum_offset, sum2_offset_sd;
   double frequency_weight, sum_frequency_weight, sum_frequency, inv_sum2_skew;
   int i, index, combined;
@@ -524,6 +529,10 @@ combine_sources(int n_sel_sources, struct timeval *ref_time, double *offset,
   sum_offset_weight = sum_offset = sum2_offset_sd = 0.0;
   sum_frequency_weight = sum_frequency = inv_sum2_skew = 0.0;
 
+  sel_src_distance = sources[selected_source_index]->sel_info.root_distance;
+  if (sources[selected_source_index]->type == SRC_NTP)
+    sel_src_distance += reselect_distance;
+
   for (i = combined = 0; i < n_sel_sources; i++) {
     index = sel_sources[i];
     SST_GetTrackingData(sources[index]->stats, &src_ref_time,
@@ -536,8 +545,7 @@ combine_sources(int n_sel_sources, struct timeval *ref_time, double *offset,
        are not close, or it was recently marked as distant */
 
     if (index != selected_source_index &&
-        (sources[index]->sel_info.root_distance > combine_limit *
-           (reselect_distance + sources[selected_source_index]->sel_info.root_distance) ||
+        (sources[index]->sel_info.root_distance > combine_limit * sel_src_distance ||
          fabs(*frequency - src_frequency) >
            combine_limit * (*skew + src_skew + LCL_GetMaxClockError()))) {
       /* Use a smaller penalty in first few updates */
@@ -597,8 +605,10 @@ SRC_SelectSource(SRC_Instance updated_inst)
   struct SelectInfo *si;
   struct timeval 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;
-  int depth, best_depth, combined, stratum, min_stratum, max_score_index;
+  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;
   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;
@@ -625,14 +635,20 @@ SRC_SelectSource(SRC_Instance updated_inst)
   n_endpoints = 0;
   n_sel_sources = 0;
   n_badstats_sources = 0;
+  sel_req_source = 0;
   max_sel_reach = max_badstat_reach = 0;
   max_reach_sample_ago = 0.0;
 
   for (i = 0; i < n_sources; i++) {
     assert(sources[i]->status != SRC_OK);
 
+    /* If some sources are specified with the require option, at least one
+       of them will have to be selectable in order to update the clock */
+    if (sources[i]->sel_options & SRC_SELECT_REQUIRE)
+      sel_req_source = 1;
+
     /* Ignore sources which were added with the noselect option */
-    if (sources[i]->sel_option == SRC_SelectNoselect) {
+    if (sources[i]->sel_options & SRC_SELECT_NOSELECT) {
       sources[i]->status = SRC_UNSELECTABLE;
       continue;
     }
@@ -651,6 +667,12 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
     }
 
+    /* Require the root distance to be below the allowed maximum */
+    if (si->root_distance > max_distance) {
+      sources[i]->status = SRC_BAD_DISTANCE;
+      continue;
+    }
+
     sources[i]->status = SRC_OK; /* For now */
 
     if (sources[i]->reachability && max_reach_sample_ago < first_sample_ago)
@@ -660,6 +682,9 @@ 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;
@@ -674,7 +699,56 @@ 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;
@@ -725,22 +799,27 @@ SRC_SelectSource(SRC_Instance updated_inst)
      If we get a case like
 
      <----------------------->
-     <-->
-     <-->
-     <===========>
+         <-->
+                  <-->
+         <===========>
 
      we will build the interval as shown with '=', whereas with an extra source we get
+
      <----------------------->
-     <------->
-     <-->
-     <-->
-     <==>
+        <------->
+         <-->
+                  <-->
+         <==>
 
      The first case is just bad luck - we need extra sources to
      detect the falseticker, so just make an arbitrary choice based
      on stratum & stability etc.
+
+     Intervals from sources specified with the trust option have higher
+     priority in the search.
      */
 
+  trust_depth = best_trust_depth = 0;
   depth = best_depth = 0;
   best_lo = best_hi = 0.0;
 
@@ -748,14 +827,20 @@ SRC_SelectSource(SRC_Instance updated_inst)
     switch (sort_list[i].tag) {
       case LOW:
         depth++;
-        if (depth > best_depth) {
+        if (sources[sort_list[i].index]->sel_options & SRC_SELECT_TRUST)
+          trust_depth++;
+        if (trust_depth > best_trust_depth ||
+            (trust_depth == best_trust_depth && depth > best_depth)) {
+          best_trust_depth = trust_depth;
           best_depth = depth;
           best_lo = sort_list[i].offset;
         }
         break;
       case HIGH:
-        if (depth == best_depth)
+        if (trust_depth == best_trust_depth && depth == best_depth)
           best_hi = sort_list[i].offset;
+        if (sources[sort_list[i].index]->sel_options & SRC_SELECT_TRUST)
+          trust_depth--;
         depth--;
         break;
       default:
@@ -763,9 +848,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
     }
   }
 
-  if (best_depth <= n_sel_sources / 2) {
-    /* Could not even get half the reachable sources to agree -
-       clearly we can't synchronise. */
+  if (best_depth <= n_sel_sources / 2 && !best_trust_depth) {
+    /* Could not even get half the reachable sources to agree and there
+       are no trusted sources - clearly we can't synchronise */
 
     if (selected_source_index != INVALID_SOURCE) {
       log_selection_message("Can't synchronise: no majority", NULL);
@@ -786,65 +871,35 @@ SRC_SelectSource(SRC_Instance updated_inst)
   n_sel_sources = 0;
 
   for (i = 0; i < n_sources; i++) {
+    /* This should be the same condition to get into the endpoint
+       list */
     if (sources[i]->status != SRC_OK)
       continue;
 
-    /* This should be the same condition to get into the endpoint
-       list */
-    /* Check if source's interval contains the best interval, or
-       is wholly contained within it */
-    if ((sources[i]->sel_info.lo_limit <= best_lo &&
+    /* Check if source's interval contains the best interval, or is wholly
+       contained within it.  If there are any trusted sources the first
+       condition is applied only to them to not allow non-trusted sources to
+       move the final offset outside the interval. */
+    if (((!best_trust_depth || sources[i]->sel_options & SRC_SELECT_TRUST) &&
+         sources[i]->sel_info.lo_limit <= best_lo &&
          sources[i]->sel_info.hi_limit >= best_hi) ||
         (sources[i]->sel_info.lo_limit >= best_lo &&
          sources[i]->sel_info.hi_limit <= best_hi)) {
 
       sel_sources[n_sel_sources++] = i;
+
+      if (sources[i]->sel_options & SRC_SELECT_REQUIRE)
+        sel_req_source = 0;
     } else {
       sources[i]->status = SRC_FALSETICKER;
     }
   }
 
-#if 0
-  /* We now have a list of indices for the sources which pass the
-     false-ticker test.  Now go on to reject those whose variance is
-     greater than the minimum distance of any other */
-
-  /* Find minimum distance */
-  index = sel_sources[0];
-  min_distance = sources[index]->sel_info.root_distance;
-  for (i = 1; i < n_sel_sources; i++) {
-    index = sel_sources[i];
-    distance = sources[index]->sel_info.root_distance;
-    if (distance < min_distance) {
-      min_distance = distance;
-    }
-  }
-
-  /* Now go through and prune any NTP sources that have excessive
-     variance */
-  for (i = 0; i < n_sel_sources; i++) {
-    index = sel_sources[i];
-    if (sources[index]->type == SRC_NTP &&
-        sqrt(sources[index]->sel_info.variance) > min_distance) {
-      sel_sources[i] = INVALID_SOURCE;
-      sources[index]->status = SRC_JITTERY;
-    }
-  }
-
-  /* Now crunch the list and mark all sources as selectable */
-  for (i = j = 0; i < n_sel_sources; i++) {
-    index = sel_sources[i];
-    if (index == INVALID_SOURCE)
-      continue;
-    sel_sources[j++] = index;
-  }
-  n_sel_sources = j;
-#endif
-
-  if (n_sel_sources == 0 || n_sel_sources < CNF_GetMinSources()) {
+  if (!n_sel_sources || sel_req_source || n_sel_sources < CNF_GetMinSources()) {
     if (selected_source_index != INVALID_SOURCE) {
       log_selection_message("Can't synchronise: %s selectable sources",
-                            n_sel_sources ? "not enough" : "no");
+                            !n_sel_sources ? "no" :
+                            sel_req_source ? "no required source in" : "not enough");
       selected_source_index = INVALID_SOURCE;
     }
     mark_ok_sources(SRC_WAITS_SOURCES);
@@ -869,16 +924,18 @@ SRC_SelectSource(SRC_Instance updated_inst)
 
   /* If there are any sources with prefer option, reduce the list again
      only to the preferred sources */
-  for (i = j = 0; i < n_sel_sources; i++) {
-    if (sources[sel_sources[i]]->sel_option == SRC_SelectPrefer)
-      sel_sources[j++] = sel_sources[i];
+  for (i = 0; i < n_sel_sources; i++) {
+    if (sources[sel_sources[i]]->sel_options & SRC_SELECT_PREFER)
+      break;
   }
-
-  if (j > 0) {
-    for (i = 0; i < n_sel_sources; i++) {
-      if (sources[sel_sources[i]]->sel_option != SRC_SelectPrefer)
+  if (i < n_sel_sources) {
+    for (i = j = 0; i < n_sel_sources; i++) {
+      if (!(sources[sel_sources[i]]->sel_options & SRC_SELECT_PREFER))
         sources[sel_sources[i]]->status = SRC_NONPREFERRED;
+      else
+        sel_sources[j++] = sel_sources[i];
     }
+    assert(j > 0);
     n_sel_sources = j;
     sel_prefer = 1;
   } else {
@@ -909,7 +966,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
   for (i = 0; i < n_sources; i++) {
     /* Reset score for non-selectable sources */
     if (sources[i]->status != SRC_OK ||
-        (sel_prefer && sources[i]->sel_option != SRC_SelectPrefer)) {
+        (sel_prefer && !(sources[i]->sel_options & SRC_SELECT_PREFER))) {
       sources[i]->sel_score = 1.0;
       sources[i]->distant = DISTANT_PENALTY;
       continue;
@@ -1125,25 +1182,23 @@ SRC_DumpSources(void)
   direc_len = strlen(direc);
   file_len = direc_len + 24;
   filename = MallocArray(char, file_len); /* a bit of slack */
-  if (mkdir_and_parents(direc)) {
-    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);
-      }
+
+  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);
     }
-  } else {
-    LOG(LOGS_ERR, LOGF_Sources, "Could not create directory %s", direc);
   }
+
   Free(filename);
 }
 
@@ -1251,7 +1306,9 @@ 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_ORPHAN:
       case SRC_WAITS_STATS:
         report->state = RPT_UNREACH;
         break;
@@ -1280,20 +1337,7 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
         break;
     }
 
-    switch (src->sel_option) {
-      case SRC_SelectNormal:
-        report->sel_option = RPT_NORMAL;
-        break;
-      case SRC_SelectPrefer:
-        report->sel_option = RPT_PREFER;
-        break;
-      case SRC_SelectNoselect:
-        report->sel_option = RPT_NOSELECT;
-        break;
-      default:
-        assert(0);
-    }
-
+    report->sel_options = src->sel_options;
     report->reachability = src->reachability;
 
     /* Call stats module to fill out estimates */

sources.h

@@ -55,17 +55,10 @@ typedef enum {
   SRC_REFCLOCK                  /* Rerefence clock */
 } SRC_Type;
 
-/* Options used when selecting sources */ 
-typedef enum {
-  SRC_SelectNormal,
-  SRC_SelectNoselect,
-  SRC_SelectPrefer
-} SRC_SelectOption;
-
 /* Function to create a new instance.  This would be called by one of
    the individual source-type instance creation routines. */
 
-extern SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, SRC_SelectOption sel_option, IPAddr *addr, int min_samples, int max_samples);
+extern SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_options, IPAddr *addr, int min_samples, int max_samples);
 
 /* Function to get rid of a source when it is being unconfigured.
    This may cause the current reference source to be reselected, if this

sourcestats.c

@@ -845,7 +845,7 @@ SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timeval *now
     UTI_DiffTimevals(&ago, now, &inst->sample_times[i]);
     report->latest_meas_ago = ago.tv_sec;
   } else {
-    report->latest_meas_ago = 86400 * 365 * 10;
+    report->latest_meas_ago = (uint32_t)-1;
     report->orig_latest_meas = 0;
     report->latest_meas = 0;
     report->latest_meas_err = 0;

srcparams.h

@@ -42,11 +42,11 @@ typedef struct {
   int max_sources;
   int min_samples;
   int max_samples;
+  int sel_options;
   uint32_t authkey;
   double max_delay;
   double max_delay_ratio;
   double max_delay_dev_ratio;
-  SRC_SelectOption sel_option;
 } SourceParameters;
 
 #define SRC_DEFAULT_PORT 123
@@ -63,4 +63,10 @@ typedef struct {
 #define SRC_DEFAULT_MAXSAMPLES (-1)
 #define INACTIVE_AUTHKEY 0
 
+/* Flags for source selection */
+#define SRC_SELECT_NOSELECT 0x1
+#define SRC_SELECT_PREFER 0x2
+#define SRC_SELECT_TRUST 0x4
+#define SRC_SELECT_REQUIRE 0x8
+
 #endif /* GOT_SRCPARAMS_H */

strerror.c

@@ -1,38 +0,0 @@
-/*
-  chronyd/chronyc - Programs for keeping computer clocks accurate.
-
- **********************************************************************
- * Copyright (C) Richard P. Curnow  1997-2002
- * 
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- * 
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- * 
- **********************************************************************
-
-  =======================================================================
-
-  Replacement strerror function for systems that don't have it
-  */
-
-#include "config.h"
-
-#ifdef SUNOS
-
-#include <errno.h>
-extern char *sys_errlist[];
-
-char *strerror(int n) {
-  return sys_errlist[n];
-}
-
-#endif /* SUNOS */

stubs.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2014
+ * Copyright (C) Miroslav Lichvar  2014-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -32,33 +32,57 @@
 #include "keys.h"
 #include "logging.h"
 #include "manual.h"
+#include "memory.h"
 #include "nameserv.h"
 #include "nameserv_async.h"
 #include "ntp_core.h"
 #include "ntp_io.h"
 #include "ntp_sources.h"
+#include "privops.h"
 #include "refclock.h"
+#include "sched.h"
 
 #ifndef FEAT_ASYNCDNS
 
-#define MAX_ADDRESSES 16
-
 /* This is a blocking implementation used when asynchronous resolving is not available */
 
+struct DNS_Async_Instance {
+  const char *name;
+  DNS_NameResolveHandler handler;
+  void *arg;
+};
+
+static void
+resolve_name(void *anything)
+{
+  struct DNS_Async_Instance *inst;
+  IPAddr addrs[DNS_MAX_ADDRESSES];
+  DNS_Status status;
+  int i;
+
+  inst = (struct DNS_Async_Instance *)anything;
+  status = PRV_Name2IPAddress(inst->name, addrs, DNS_MAX_ADDRESSES);
+
+  for (i = 0; status == DNS_Success && i < DNS_MAX_ADDRESSES &&
+       addrs[i].family != IPADDR_UNSPEC; i++)
+    ;
+
+  (inst->handler)(status, i, addrs, inst->arg);
+
+  Free(inst);
+}
+
 void
 DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *anything)
 {
-  IPAddr addrs[MAX_ADDRESSES];
-  DNS_Status status;
-  int i;
+  struct DNS_Async_Instance *inst;
 
-  status = DNS_Name2IPAddress(name, addrs, MAX_ADDRESSES);
+  inst = MallocNew(struct DNS_Async_Instance);
+  inst->name = name;
+  inst->handler = handler;
+  inst->arg = anything;
 
-  for (i = 0; status == DNS_Success && i < MAX_ADDRESSES &&
-              addrs[i].family != IPADDR_UNSPEC; i++)
-    ;
-
-  (handler)(status, i, addrs, anything);
+  SCH_AddTimeoutByDelay(0.0, resolve_name, inst);
 }
 
 #endif /* !FEAT_ASYNCDNS */
@@ -75,6 +99,11 @@ CAM_Finalise(void)
 {
 }
 
+void
+CAM_OpenUnixSocket(void)
+{
+}
+
 int
 CAM_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all)
 {
@@ -169,6 +198,11 @@ NSR_HandleBadSource(IPAddr *address)
 {
 }
 
+void
+NSR_RefreshAddresses(void)
+{
+}
+
 void
 NSR_SetSourceResolvingEndHandler(NSR_SourceResolvingEndHandler handler)
 {
@@ -196,6 +230,12 @@ 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)
 {

sys.c

@@ -27,23 +27,19 @@
 
 #include "config.h"
 
+#include "sysincl.h"
+
 #include "sys.h"
 #include "logging.h"
 
-#if defined (LINUX)
+#if defined(LINUX)
 #include "sys_linux.h"
-#endif
-
-#if defined (SOLARIS)
+#elif defined(SOLARIS)
 #include "sys_solaris.h"
-#endif
-
-#if defined (SUNOS)
-#include "sys_sunos.h"
-#endif
-
-#if defined (__NetBSD__)
+#elif defined(NETBSD) || defined(FREEBSD)
 #include "sys_netbsd.h"
+#elif defined(MACOSX)
+#include "sys_macosx.h"
 #endif
 
 /* ================================================== */
@@ -51,23 +47,17 @@
 void
 SYS_Initialise(void)
 {
-
 #if defined(LINUX)
   SYS_Linux_Initialise();
-#endif
-
-#if defined(SOLARIS)
+#elif defined(SOLARIS)
   SYS_Solaris_Initialise();
-#endif
-
-#if defined(SUNOS)
-  SYS_SunOS_Initialise();
-#endif
-
-#if defined(__NetBSD__)
+#elif defined(NETBSD) || defined(FREEBSD)
   SYS_NetBSD_Initialise();
+#elif defined(MACOSX)
+  SYS_MacOSX_Initialise();
+#else
+#error Unknown system
 #endif
-
 }
 
 /* ================================================== */
@@ -75,30 +65,31 @@ SYS_Initialise(void)
 void
 SYS_Finalise(void)
 {
-  
 #if defined(LINUX)
   SYS_Linux_Finalise();
-#endif
-
-#if defined(SOLARIS)
+#elif defined(SOLARIS)
   SYS_Solaris_Finalise();
-#endif
-
-#if defined(SUNOS)
-  SYS_SunOS_Finalise();
-#endif
-
-#if defined(__NetBSD__)
+#elif defined(NETBSD) || defined(FREEBSD)
   SYS_NetBSD_Finalise();
+#elif defined(MACOSX)
+  SYS_MacOSX_Finalise();
+#else
+#error Unknown system
 #endif
 }
 
 /* ================================================== */
 
-void SYS_DropRoot(char *user)
+void SYS_DropRoot(uid_t uid, gid_t gid)
 {
 #if defined(LINUX) && defined (FEAT_PRIVDROP)
-  SYS_Linux_DropRoot(user);
+  SYS_Linux_DropRoot(uid, gid);
+#elif defined(SOLARIS) && defined(FEAT_PRIVDROP)
+  SYS_Solaris_DropRoot(uid, gid);
+#elif (defined(NETBSD) || defined(FREEBSD)) && defined(FEAT_PRIVDROP)
+  SYS_NetBSD_DropRoot(uid, gid);
+#elif defined(MACOSX) && defined(FEAT_PRIVDROP)
+  SYS_MacOSX_DropRoot(uid, gid);
 #else
   LOG_FATAL(LOGF_Sys, "dropping root privileges not supported");
 #endif
@@ -106,10 +97,23 @@ void SYS_DropRoot(char *user)
 
 /* ================================================== */
 
+void SYS_EnableSystemCallFilter(int level)
+{
+#if defined(LINUX) && defined(FEAT_SCFILTER)
+  SYS_Linux_EnableSystemCallFilter(level);
+#else
+  LOG_FATAL(LOGF_Sys, "system call filter not supported");
+#endif
+}
+
+/* ================================================== */
+
 void SYS_SetScheduler(int SchedPriority)
 {
 #if defined(LINUX) && defined(HAVE_SCHED_SETSCHEDULER)
   SYS_Linux_SetScheduler(SchedPriority);
+#elif defined(MACOSX)
+  SYS_MacOSX_SetScheduler(SchedPriority);
 #else
   LOG_FATAL(LOGF_Sys, "scheduler priority setting not supported");
 #endif

sys.h

@@ -35,8 +35,12 @@ extern void SYS_Initialise(void);
 /* Called at the end of the run to do final clean-up */
 extern void SYS_Finalise(void);
 
-/* Drop root privileges to the specified user */
-extern void SYS_DropRoot(char *user);
+/* Drop root privileges to the specified user and group */
+extern void SYS_DropRoot(uid_t uid, gid_t gid);
+
+/* Enable a system call filter to allow only system calls
+   which chronyd normally needs after initialization */
+extern void SYS_EnableSystemCallFilter(int level);
 
 extern void SYS_SetScheduler(int SchedPriority);
 extern void SYS_LockMemory(void);

sys_generic.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2014
+ * Copyright (C) Miroslav Lichvar  2014-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -34,6 +34,7 @@
 #include "local.h"
 #include "localp.h"
 #include "logging.h"
+#include "privops.h"
 #include "sched.h"
 #include "util.h"
 
@@ -43,6 +44,8 @@
 static lcl_ReadFrequencyDriver drv_read_freq;
 static lcl_SetFrequencyDriver drv_set_freq;
 static lcl_SetSyncStatusDriver drv_set_sync_status;
+static lcl_AccrueOffsetDriver drv_accrue_offset;
+static lcl_OffsetCorrectionDriver drv_get_offset_correction;
 
 /* Current frequency as requested by the local module (in ppm) */
 static double base_freq;
@@ -74,9 +77,8 @@ static struct timeval slew_start;
 #define MIN_SLEW_TIMEOUT 1.0
 #define MAX_SLEW_TIMEOUT 1.0e4
 
-/* Scheduler timeout ID and flag if the timer is currently running */
+/* Scheduler timeout ID for ending of the currently running slew */
 static SCH_TimeoutID slew_timeout_id;
-static int slew_timer_running;
 
 /* Suggested offset correction rate (correction time * offset) */
 static double correction_rate;
@@ -85,6 +87,16 @@ static double correction_rate;
    real frequency of the clock */
 static double slew_error;
 
+/* Minimum offset that the system driver can slew faster than the maximum
+   frequency offset that it allows to be set directly */
+static double fastslew_min_offset;
+
+/* Maximum slew rate of the system driver */
+static double fastslew_max_rate;
+
+/* Flag indicating that the system driver is currently slewing */
+static int fastslew_active;
+
 /* ================================================== */
 
 static void handle_end_of_slew(void *anything);
@@ -107,6 +119,50 @@ handle_step(struct timeval *raw, struct timeval *cooked, double dfreq,
   }
 }
 
+/* ================================================== */
+
+static void
+start_fastslew(void)
+{
+  if (!drv_accrue_offset)
+    return;
+
+  drv_accrue_offset(offset_register, 0.0);
+
+  DEBUG_LOG(LOGF_SysGeneric, "fastslew offset=%e", offset_register);
+
+  offset_register = 0.0;
+  fastslew_active = 1;
+}
+
+/* ================================================== */
+
+static void
+stop_fastslew(struct timeval *now)
+{
+  double corr;
+
+  if (!drv_get_offset_correction || !fastslew_active)
+    return;
+
+  /* Cancel the remaining offset */
+  drv_get_offset_correction(now, &corr, NULL);
+  drv_accrue_offset(corr, 0.0);
+  offset_register -= corr;
+}
+
+/* ================================================== */
+
+static double
+clamp_freq(double freq)
+{
+  if (freq > max_freq)
+    return max_freq;
+  if (freq < -max_freq)
+    return -max_freq;
+  return freq;
+}
+
 /* ================================================== */
 /* End currently running slew and start a new one */
 
@@ -117,8 +173,7 @@ update_slew(void)
   double old_slew_freq, total_freq, corr_freq, duration;
 
   /* Remove currently running timeout */
-  if (slew_timer_running)
-    SCH_RemoveTimeout(slew_timeout_id);
+  SCH_RemoveTimeout(slew_timeout_id);
 
   LCL_ReadRawTime(&now);
 
@@ -126,6 +181,8 @@ update_slew(void)
   UTI_DiffTimevalsToDouble(&duration, &now, &slew_start);
   offset_register -= slew_freq * duration;
 
+  stop_fastslew(&now);
+
   /* Estimate how long should the next slew take */
   if (fabs(offset_register) < MIN_OFFSET_CORRECTION) {
     duration = MAX_SLEW_TIMEOUT;
@@ -143,12 +200,16 @@ update_slew(void)
   else if (corr_freq > max_corr_freq)
     corr_freq = max_corr_freq;
 
+  /* Let the system driver perform the slew if the requested frequency
+     offset is too large for the frequency driver */
+  if (drv_accrue_offset && fabs(corr_freq) >= fastslew_max_rate &&
+      fabs(offset_register) > fastslew_min_offset) {
+    start_fastslew();
+    corr_freq = 0.0;
+  }
+
   /* Get the new real frequency and clamp it */
-  total_freq = base_freq + corr_freq * (1.0e6 - base_freq);
-  if (total_freq > max_freq)
-    total_freq = max_freq;
-  else if (total_freq < -max_freq)
-    total_freq = -max_freq;
+  total_freq = clamp_freq(base_freq + corr_freq * (1.0e6 - base_freq));
 
   /* Set the new frequency (the actual frequency returned by the call may be
      slightly different from the requested frequency due to rounding) */
@@ -167,8 +228,8 @@ update_slew(void)
 
   /* Compute the duration of the slew and clamp it.  If the slewing frequency
      is zero or has wrong sign (e.g. due to rounding in the frequency driver or
-     when base_freq is larger than max_freq), use maximum timeout and try again
-     on the next update. */
+     when base_freq is larger than max_freq, or fast slew is active), use the
+     maximum timeout and try again on the next update. */
   if (fabs(offset_register) < MIN_OFFSET_CORRECTION ||
       offset_register * slew_freq <= 0.0) {
     duration = MAX_SLEW_TIMEOUT;
@@ -183,9 +244,7 @@ update_slew(void)
   /* Restart timer for the next update */
   UTI_AddDoubleToTimeval(&now, duration, &end_of_slew);
   slew_timeout_id = SCH_AddTimeout(&end_of_slew, handle_end_of_slew, NULL);
-
   slew_start = now;
-  slew_timer_running = 1;
 
   DEBUG_LOG(LOGF_SysGeneric, "slew offset=%e corr_rate=%e base_freq=%f total_freq=%f slew_freq=%e duration=%f slew_error=%e",
       offset_register, correction_rate, base_freq, total_freq, slew_freq,
@@ -197,7 +256,7 @@ update_slew(void)
 static void
 handle_end_of_slew(void *anything)
 {
-  slew_timer_running = 0;
+  slew_timeout_id = 0;
   update_slew();
 }
 
@@ -238,13 +297,25 @@ static void
 offset_convert(struct timeval *raw,
                double *corr, double *err)
 {
-  double duration;
+  double duration, fastslew_corr, fastslew_err;
 
   UTI_DiffTimevalsToDouble(&duration, raw, &slew_start);
 
-  *corr = slew_freq * duration - offset_register;
-  if (err)
-    *err = fabs(duration) <= max_freq_change_delay ? slew_error : 0.0;
+  if (drv_get_offset_correction && fastslew_active) {
+    drv_get_offset_correction(raw, &fastslew_corr, &fastslew_err);
+    if (fastslew_corr == 0.0 && fastslew_err == 0.0)
+      fastslew_active = 0;
+  } else {
+    fastslew_corr = fastslew_err = 0.0;
+  }
+
+  *corr = slew_freq * duration + fastslew_corr - offset_register;
+
+  if (err) {
+    *err = fastslew_err;
+    if (fabs(duration) <= max_freq_change_delay)
+      *err += slew_error;
+  }
 }
 
 /* ================================================== */
@@ -259,7 +330,7 @@ apply_step_offset(double offset)
   LCL_ReadRawTime(&old_time);
   UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
 
-  if (settimeofday(&new_time, NULL) < 0) {
+  if (PRV_SetTime(&new_time, NULL) < 0) {
     DEBUG_LOG(LOGF_SysGeneric, "settimeofday() failed");
     return 0;
   }
@@ -295,6 +366,9 @@ SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_set_freq_dela
                                lcl_ReadFrequencyDriver sys_read_freq,
                                lcl_SetFrequencyDriver sys_set_freq,
                                lcl_ApplyStepOffsetDriver sys_apply_step_offset,
+                               double min_fastslew_offset, double max_fastslew_rate,
+                               lcl_AccrueOffsetDriver sys_accrue_offset,
+                               lcl_OffsetCorrectionDriver sys_get_offset_correction,
                                lcl_SetLeapDriver sys_set_leap,
                                lcl_SetSyncStatusDriver sys_set_sync_status)
 {
@@ -302,6 +376,8 @@ SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_set_freq_dela
   max_freq_change_delay = max_set_freq_delay * (1.0 + max_freq / 1.0e6);
   drv_read_freq = sys_read_freq;
   drv_set_freq = sys_set_freq;
+  drv_accrue_offset = sys_accrue_offset;
+  drv_get_offset_correction = sys_get_offset_correction;
   drv_set_sync_status = sys_set_sync_status;
 
   base_freq = (*drv_read_freq)();
@@ -310,6 +386,10 @@ SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_set_freq_dela
 
   max_corr_freq = CNF_GetMaxSlewRate() / 1.0e6;
 
+  fastslew_min_offset = min_fastslew_offset;
+  fastslew_max_rate = max_fastslew_rate / 1.0e6;
+  fastslew_active = 0;
+
   lcl_RegisterSystemDrivers(read_frequency, set_frequency,
                             accrue_offset, sys_apply_step_offset ?
                               sys_apply_step_offset : apply_step_offset,
@@ -323,14 +403,18 @@ SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_set_freq_dela
 void
 SYS_Generic_Finalise(void)
 {
+  struct timeval now;
+
   /* Must *NOT* leave a slew running - clock could drift way off
      if the daemon is not restarted */
-  if (slew_timer_running) {
-    SCH_RemoveTimeout(slew_timeout_id);
-    slew_timer_running = 0;
-  }
 
-  (*drv_set_freq)(base_freq);
+  SCH_RemoveTimeout(slew_timeout_id);
+  slew_timeout_id = 0;
+
+  (*drv_set_freq)(clamp_freq(base_freq));
+
+  LCL_ReadRawTime(&now);
+  stop_fastslew(&now);
 }
 
 /* ================================================== */

sys_generic.h

@@ -35,6 +35,9 @@ extern void SYS_Generic_CompleteFreqDriver(double max_set_freq_ppm, double max_s
                                            lcl_ReadFrequencyDriver sys_read_freq,
                                            lcl_SetFrequencyDriver sys_set_freq,
                                            lcl_ApplyStepOffsetDriver sys_apply_step_offset,
+                                           double min_fastslew_offset, double max_fastslew_rate,
+                                           lcl_AccrueOffsetDriver sys_accrue_offset,
+                                           lcl_OffsetCorrectionDriver sys_get_offset_correction,
                                            lcl_SetLeapDriver sys_set_leap,
                                            lcl_SetSyncStatusDriver sys_set_sync_status);
 

sys_linux.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) John G. Hasler  2009
- * Copyright (C) Miroslav Lichvar  2009-2012, 2014
+ * Copyright (C) Miroslav Lichvar  2009-2012, 2014-2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -35,31 +35,50 @@
 
 #if defined(HAVE_SCHED_SETSCHEDULER)
 #  include <sched.h>
-int SchedPriority = 0;
 #endif
 
 #if defined(HAVE_MLOCKALL)
 #  include <sys/mman.h>
 #include <sys/resource.h>
-int LockAll = 0;
 #endif
 
 #ifdef FEAT_PRIVDROP
-#include <sys/types.h>
-#include <pwd.h>
 #include <sys/prctl.h>
 #include <sys/capability.h>
-#include <grp.h>
 #endif
 
-#include "sys_generic.h"
+#ifdef FEAT_SCFILTER
+#include <sys/prctl.h>
+#include <seccomp.h>
+#include <termios.h>
+#ifdef FEAT_PHC
+#include <linux/ptp_clock.h>
+#endif
+#ifdef FEAT_PPS
+#include <linux/pps.h>
+#endif
+#ifdef FEAT_RTC
+#include <linux/rtc.h>
+#endif
+#endif
+
 #include "sys_linux.h"
+#include "sys_timex.h"
 #include "conf.h"
 #include "logging.h"
-#include "wrap_adjtimex.h"
+#include "privops.h"
+#include "util.h"
 
-/* The threshold for adjtimex maxerror when the kernel sets the UNSYNC flag */
-#define UNSYNC_MAXERROR 16.0
+/* Frequency scale to convert from ppm to the timex freq */
+#define FREQ_SCALE (double)(1 << 16)
+
+/* Definitions used if missed in the system headers */
+#ifndef ADJ_SETOFFSET
+#define ADJ_SETOFFSET           0x0100  /* add 'time' to current time */
+#endif
+#ifndef ADJ_NANO
+#define ADJ_NANO                0x2000  /* select nanosecond resolution */
+#endif
 
 /* This is the uncompensated system tick value */
 static int nominal_tick;
@@ -103,11 +122,19 @@ our_round(double x)
 static int
 apply_step_offset(double offset)
 {
-  if (TMX_ApplyStepOffset(-offset) < 0) {
-    DEBUG_LOG(LOGF_SysLinux, "adjtimex() failed");
-    return 0;
+  struct timex txc;
+
+  txc.modes = ADJ_SETOFFSET | ADJ_NANO;
+  txc.time.tv_sec = -offset;
+  txc.time.tv_usec = 1.0e9 * (-offset - txc.time.tv_sec);
+  if (txc.time.tv_usec < 0) {
+    txc.time.tv_sec--;
+    txc.time.tv_usec += 1000000000;
   }
 
+  if (SYS_Timex_Adjust(&txc, 1) < 0)
+    return 0;
+
   return 1;
 }
 
@@ -121,6 +148,7 @@ apply_step_offset(double offset)
 static double
 set_frequency(double freq_ppm)
 {
+  struct timex txc;
   long required_tick;
   double required_freq;
   int required_delta_tick;
@@ -144,14 +172,15 @@ set_frequency(double freq_ppm)
   required_freq = -(freq_ppm - dhz * required_delta_tick);
   required_tick = nominal_tick - required_delta_tick;
 
-  if (TMX_SetFrequency(&required_freq, required_tick) < 0) {
-    LOG_FATAL(LOGF_SysLinux, "adjtimex failed for set_frequency, freq_ppm=%10.4e required_freq=%10.4e required_tick=%ld",
-        freq_ppm, required_freq, required_tick);
-  }
+  txc.modes = ADJ_TICK | ADJ_FREQUENCY;
+  txc.freq = required_freq * FREQ_SCALE;
+  txc.tick = required_tick;
+
+  SYS_Timex_Adjust(&txc, 0);
 
   current_delta_tick = required_delta_tick;
 
-  return dhz * current_delta_tick - required_freq;
+  return dhz * current_delta_tick - txc.freq / FREQ_SCALE;
 }
 
 /* ================================================== */
@@ -160,61 +189,15 @@ set_frequency(double freq_ppm)
 static double
 read_frequency(void)
 {
-  long tick;
-  double freq;
+  struct timex txc;
 
-  if (TMX_GetFrequency(&freq, &tick) < 0) {
-    LOG_FATAL(LOGF_SysLinux, "adjtimex() failed");
-  }
+  txc.modes = 0;
 
-  current_delta_tick = nominal_tick - tick;
-  
-  return dhz * current_delta_tick - freq;
-}
+  SYS_Timex_Adjust(&txc, 0);
 
-/* ================================================== */
+  current_delta_tick = nominal_tick - txc.tick;
 
-static void
-set_leap(int leap)
-{
-  int current_leap;
-
-  if (TMX_GetLeap(&current_leap) < 0) {
-    LOG_FATAL(LOGF_SysLinux, "adjtimex() failed in set_leap");
-  }
-
-  if (current_leap == leap)
-    return;
-
-  if (TMX_SetLeap(leap) < 0) {
-    LOG_FATAL(LOGF_SysLinux, "adjtimex() failed in set_leap");
-  }
-
-  LOG(LOGS_INFO, LOGF_SysLinux, "System clock status set to %s leap second",
-     leap ? (leap > 0 ? "insert" : "delete") : "not insert/delete");
-}
-
-/* ================================================== */
-
-static void
-set_sync_status(int synchronised, double est_error, double max_error)
-{
-  if (synchronised) {
-    if (est_error > UNSYNC_MAXERROR)
-      est_error = UNSYNC_MAXERROR;
-    if (max_error >= UNSYNC_MAXERROR) {
-      max_error = UNSYNC_MAXERROR;
-      synchronised = 0;
-    }
-  } else {
-    est_error = max_error = UNSYNC_MAXERROR;
-  }
-
-  /* Clear the UNSYNC flag only if rtcsync is enabled */
-  if (!CNF_GetRtcSync())
-    synchronised = 0;
-
-  TMX_SetSync(synchronised, est_error, max_error);
+  return dhz * current_delta_tick - txc.freq / FREQ_SCALE;
 }
 
 /* ================================================== */
@@ -225,10 +208,16 @@ set_sync_status(int synchronised, double est_error, double max_error)
  * a +/- 10% movement of tick away from the nominal value 1e6/USER_HZ. */
 
 static int
-guess_hz(int tick)
+guess_hz(void)
 {
-  int i, tick_lo, tick_hi, ihz;
+  struct timex txc;
+  int i, tick, tick_lo, tick_hi, ihz;
   double tick_nominal;
+
+  txc.modes = 0;
+  SYS_Timex_Adjust(&txc, 0);
+  tick = txc.tick;
+
   /* Pick off the hz=100 case first */
   if (tick >= 9000 && tick <= 11000) {
     return 100;
@@ -246,6 +235,8 @@ guess_hz(int tick)
   }
 
   /* oh dear.  doomed. */
+  LOG_FATAL(LOGF_SysLinux, "Can't determine hz from tick %d", tick);
+
   return 0;
 }
 
@@ -287,21 +278,12 @@ static void
 get_version_specific_details(void)
 {
   int major, minor, patch;
-  long tick;
-  double freq;
   struct utsname uts;
   
   hz = get_hz();
 
-  if (!hz) {
-    if (TMX_GetFrequency(&freq, &tick) < 0)
-      LOG_FATAL(LOGF_SysLinux, "adjtimex() failed");
-
-    hz = guess_hz(tick);
-
-    if (!hz)
-      LOG_FATAL(LOGF_SysLinux, "Can't determine hz from tick %ld", tick);
-  }
+  if (!hz)
+    hz = guess_hz();
 
   dhz = (double) hz;
   nominal_tick = (1000000L + (hz/2))/hz; /* Mirror declaration in kernel */
@@ -344,6 +326,48 @@ get_version_specific_details(void)
       hz, nominal_tick, max_tick_bias);
 }
 
+/* ================================================== */
+
+static void
+reset_adjtime_offset(void)
+{
+  struct timex txc;
+
+  /* Reset adjtime() offset */
+  txc.modes = ADJ_OFFSET_SINGLESHOT;
+  txc.offset = 0;
+
+  SYS_Timex_Adjust(&txc, 0);
+}
+
+/* ================================================== */
+
+static int
+test_step_offset(void)
+{
+  struct timex txc;
+
+  /* Zero maxerror and check it's reset to a maximum after ADJ_SETOFFSET.
+     This seems to be the only way how to verify that the kernel really
+     supports the ADJ_SETOFFSET mode as it doesn't return an error on unknown
+     mode. */
+
+  txc.modes = MOD_MAXERROR;
+  txc.maxerror = 0;
+
+  if (SYS_Timex_Adjust(&txc, 1) < 0 || txc.maxerror != 0)
+    return 0;
+
+  txc.modes = ADJ_SETOFFSET | ADJ_NANO;
+  txc.time.tv_sec = 0;
+  txc.time.tv_usec = 0;
+
+  if (SYS_Timex_Adjust(&txc, 1) < 0 || txc.maxerror < 100000)
+    return 0;
+
+  return 1;
+}
+
 /* ================================================== */
 /* Initialisation code for this module */
 
@@ -352,20 +376,18 @@ SYS_Linux_Initialise(void)
 {
   get_version_specific_details();
 
-  if (TMX_ResetOffset() < 0) {
-    LOG_FATAL(LOGF_SysLinux, "adjtimex() failed");
-  }
+  reset_adjtime_offset();
 
-  if (have_setoffset && TMX_TestStepOffset() < 0) {
+  if (have_setoffset && !test_step_offset()) {
     LOG(LOGS_INFO, LOGF_SysLinux, "adjtimex() doesn't support ADJ_SETOFFSET");
     have_setoffset = 0;
   }
 
-  SYS_Generic_CompleteFreqDriver(1.0e6 * max_tick_bias / nominal_tick,
-                                 1.0 / tick_update_hz,
-                                 read_frequency, set_frequency,
-                                 have_setoffset ? apply_step_offset : NULL,
-                                 set_leap, set_sync_status);
+  SYS_Timex_InitialiseWithFunctions(1.0e6 * max_tick_bias / nominal_tick,
+                                    1.0 / tick_update_hz,
+                                    read_frequency, set_frequency,
+                                    have_setoffset ? apply_step_offset : NULL,
+                                    0.0, 0.0, NULL, NULL);
 }
 
 /* ================================================== */
@@ -374,42 +396,29 @@ SYS_Linux_Initialise(void)
 void
 SYS_Linux_Finalise(void)
 {
-  SYS_Generic_Finalise();
+  SYS_Timex_Finalise();
 }
 
 /* ================================================== */
 
 #ifdef FEAT_PRIVDROP
 void
-SYS_Linux_DropRoot(char *user)
+SYS_Linux_DropRoot(uid_t uid, gid_t gid)
 {
-  struct passwd *pw;
+  const char *cap_text;
   cap_t cap;
 
-  if (user == NULL)
-    return;
-
-  if ((pw = getpwnam(user)) == NULL) {
-    LOG_FATAL(LOGF_SysLinux, "getpwnam(%s) failed", user);
-  }
-
   if (prctl(PR_SET_KEEPCAPS, 1)) {
     LOG_FATAL(LOGF_SysLinux, "prctl() failed");
   }
   
-  if (setgroups(0, NULL)) {
-    LOG_FATAL(LOGF_SysLinux, "setgroups() failed");
-  }
+  UTI_DropRoot(uid, gid);
 
-  if (setgid(pw->pw_gid)) {
-    LOG_FATAL(LOGF_SysLinux, "setgid(%d) failed", pw->pw_gid);
-  }
+  /* Keep CAP_NET_BIND_SERVICE only if NTP port can be opened */
+  cap_text = CNF_GetNTPPort() ?
+             "cap_net_bind_service,cap_sys_time=ep" : "cap_sys_time=ep";
 
-  if (setuid(pw->pw_uid)) {
-    LOG_FATAL(LOGF_SysLinux, "setuid(%d) failed", pw->pw_uid);
-  }
-
-  if ((cap = cap_from_text("cap_net_bind_service,cap_sys_time=ep")) == NULL) {
+  if ((cap = cap_from_text(cap_text)) == NULL) {
     LOG_FATAL(LOGF_SysLinux, "cap_from_text() failed");
   }
 
@@ -418,8 +427,153 @@ SYS_Linux_DropRoot(char *user)
   }
 
   cap_free(cap);
+}
+#endif
 
-  DEBUG_LOG(LOGF_SysLinux, "Privileges dropped to user %s", user);
+/* ================================================== */
+
+#ifdef FEAT_SCFILTER
+static
+void check_seccomp_applicability(void)
+{
+  int mail_enabled;
+  double mail_threshold;
+  char *mail_user;
+
+  CNF_GetMailOnChange(&mail_enabled, &mail_threshold, &mail_user);
+  if (mail_enabled)
+    LOG_FATAL(LOGF_SysLinux, "mailonchange directive cannot be used with -F enabled");
+}
+
+/* ================================================== */
+
+void
+SYS_Linux_EnableSystemCallFilter(int level)
+{
+  const int syscalls[] = {
+    /* Clock */
+    SCMP_SYS(adjtimex), 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),
+    SCMP_SYS(set_tid_address), SCMP_SYS(sigreturn), SCMP_SYS(wait4),
+    /* Memory */
+    SCMP_SYS(brk), SCMP_SYS(madvise), SCMP_SYS(mmap), SCMP_SYS(mmap2),
+    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),
+    /* 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),
+    /* TODO: check socketcall arguments */
+    SCMP_SYS(socketcall),
+    /* General I/O */
+    SCMP_SYS(_newselect), SCMP_SYS(close), SCMP_SYS(open), SCMP_SYS(pipe),
+    SCMP_SYS(poll), SCMP_SYS(read), SCMP_SYS(futex), SCMP_SYS(select),
+    SCMP_SYS(set_robust_list), SCMP_SYS(write),
+    /* Miscellaneous */
+    SCMP_SYS(uname),
+  };
+
+  const int socket_domains[] = {
+    AF_NETLINK, AF_UNIX, AF_INET,
+#ifdef FEAT_IPV6
+    AF_INET6,
+#endif
+  };
+
+  const static int socket_options[][2] = {
+    { SOL_IP, IP_PKTINFO }, { SOL_IP, IP_FREEBIND },
+#ifdef FEAT_IPV6
+    { SOL_IPV6, IPV6_V6ONLY }, { SOL_IPV6, IPV6_RECVPKTINFO },
+#endif
+    { SOL_SOCKET, SO_BROADCAST }, { SOL_SOCKET, SO_REUSEADDR },
+    { SOL_SOCKET, SO_TIMESTAMP },
+  };
+
+  const static int fcntls[] = { F_GETFD, F_SETFD };
+
+  const static unsigned long ioctls[] = {
+    FIONREAD, TCGETS,
+#ifdef FEAT_PPS
+    PTP_SYS_OFFSET,
+#endif
+#ifdef FEAT_PPS
+    PPS_FETCH,
+#endif
+#ifdef FEAT_RTC
+    RTC_RD_TIME, RTC_SET_TIME, RTC_UIE_ON, RTC_UIE_OFF,
+#endif
+  };
+
+  scmp_filter_ctx *ctx;
+  int i;
+
+  /* Check if the chronyd configuration is supported */
+  check_seccomp_applicability();
+
+  /* Start the helper process, which will run without any seccomp filter.  It
+     will be used for getaddrinfo(), for which it's difficult to maintain a
+     list of required system calls (with glibc it depends on what NSS modules
+     are installed and enabled on the system). */
+  PRV_StartHelper();
+
+  ctx = seccomp_init(level > 0 ? SCMP_ACT_KILL : SCMP_ACT_TRAP);
+  if (ctx == NULL)
+      LOG_FATAL(LOGF_SysLinux, "Failed to initialize seccomp");
+
+  /* Add system calls that are always allowed */
+  for (i = 0; i < (sizeof (syscalls) / sizeof (*syscalls)); i++) {
+    if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscalls[i], 0) < 0)
+      goto add_failed;
+  }
+
+  /* Allow sockets to be created only in selected domains */
+  for (i = 0; i < sizeof (socket_domains) / sizeof (*socket_domains); i++) {
+    if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(socket), 1,
+                         SCMP_A0(SCMP_CMP_EQ, socket_domains[i])) < 0)
+      goto add_failed;
+  }
+
+  /* Allow setting only selected sockets options */
+  for (i = 0; i < sizeof (socket_options) / sizeof (*socket_options); i++) {
+    if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(setsockopt), 3,
+                         SCMP_A1(SCMP_CMP_EQ, socket_options[i][0]),
+                         SCMP_A2(SCMP_CMP_EQ, socket_options[i][1]),
+                         SCMP_A4(SCMP_CMP_LE, sizeof (int))) < 0)
+      goto add_failed;
+  }
+
+  /* Allow only selected fcntl calls */
+  for (i = 0; i < sizeof (fcntls) / sizeof (*fcntls); i++) {
+    if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1,
+                         SCMP_A1(SCMP_CMP_EQ, fcntls[i])) < 0 ||
+        seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl64), 1,
+                         SCMP_A1(SCMP_CMP_EQ, fcntls[i])) < 0)
+      goto add_failed;
+  }
+
+  /* Allow only selected ioctls */
+  for (i = 0; i < sizeof (ioctls) / sizeof (*ioctls); i++) {
+    if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1,
+                         SCMP_A1(SCMP_CMP_EQ, ioctls[i])) < 0)
+      goto add_failed;
+  }
+
+  if (seccomp_load(ctx) < 0)
+    LOG_FATAL(LOGF_SysLinux, "Failed to load seccomp rules");
+
+  LOG(LOGS_INFO, LOGF_SysLinux, "Loaded seccomp filter");
+  seccomp_release(ctx);
+  return;
+
+add_failed:
+  LOG_FATAL(LOGF_SysLinux, "Failed to add seccomp rules");
 }
 #endif
 

sys_linux.h

@@ -31,7 +31,9 @@ extern void SYS_Linux_Initialise(void);
 
 extern void SYS_Linux_Finalise(void);
 
-extern void SYS_Linux_DropRoot(char *user);
+extern void SYS_Linux_DropRoot(uid_t uid, gid_t gid);
+
+extern void SYS_Linux_EnableSystemCallFilter(int level);
 
 extern void SYS_Linux_MemLockAll(int LockAll);
 

sys_macosx.c

@@ -0,0 +1,455 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2001
+ * Copyright (C) J. Hannken-Illjes  2001
+ * Copyright (C) Bryan Christianson 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  Driver file for the MacOS X operating system.
+
+  */
+
+#include "config.h"
+
+#ifdef MACOSX
+
+#include "sysincl.h"
+
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+#include <pthread.h>
+
+#include "sys_macosx.h"
+#include "conf.h"
+#include "localp.h"
+#include "logging.h"
+#include "sched.h"
+#include "privops.h"
+#include "util.h"
+
+/* ================================================== */
+
+/* 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 */
+
+static double offset_register;
+
+/* This register contains the epoch to which the offset is referenced */
+
+static struct timeval T0;
+
+/* This register contains the current estimate of the system
+   frequency, in absolute (NOT ppm) */
+
+static double current_freq;
+
+/* This register contains the number of seconds of adjustment that
+   were passed to adjtime last time it was called. */
+
+static double adjustment_requested;
+
+/* Interval in seconds between adjustments to cancel systematic drift */
+
+#define DRIFT_REMOVAL_INTERVAL (4.0)
+#define DRIFT_REMOVAL_INTERVAL_MIN (0.5)
+
+/* If current_drift_removal_interval / drift_removal_interval exceeds this
+   ratio, then restart the drift removal timer */
+
+#define DRIFT_REMOVAL_RESTART_RATIO (8.0)
+
+static double drift_removal_interval;
+static double current_drift_removal_interval;
+static struct timeval Tdrift;
+
+/* weighting applied to error in calculating drift_removal_interval */
+#define ERROR_WEIGHT (0.5)
+
+/* minimum resolution of current_frequency */
+#define FREQUENCY_RES (1.0e-9)
+
+#define NANOS_PER_MSEC (1000000ULL)
+
+/* RTC synchronisation - once an hour */
+
+static struct timeval last_rtc_sync;
+#define RTC_SYNC_INTERVAL (60 * 60.0)
+
+/* ================================================== */
+
+static void
+clock_initialise(void)
+{
+  struct timeval newadj, oldadj;
+
+  offset_register = 0.0;
+  adjustment_requested = 0.0;
+  current_freq = 0.0;
+  drift_removal_interval = DRIFT_REMOVAL_INTERVAL;
+  current_drift_removal_interval = DRIFT_REMOVAL_INTERVAL;
+
+  if (gettimeofday(&T0, NULL) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
+  }
+  Tdrift = T0;
+  last_rtc_sync = T0;
+
+  newadj.tv_sec = 0;
+  newadj.tv_usec = 0;
+
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
+  }
+}
+
+/* ================================================== */
+
+static void
+clock_finalise(void)
+{
+  /* Nothing to do yet */
+}
+
+/* ================================================== */
+
+static void
+start_adjust(void)
+{
+  struct timeval newadj, oldadj;
+  struct timeval 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");
+  }
+
+  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
+  accrued_error = elapsed * current_freq;
+
+  UTI_DiffTimevalsToDouble(&drift_removal_elapsed, &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 ] */
+  drift_removal_elapsed = MIN(MAX(0.0, drift_removal_elapsed), current_drift_removal_interval);
+
+  predicted_error = (current_drift_removal_interval - drift_removal_elapsed) / 2.0 * current_freq;
+
+  DEBUG_LOG(LOGF_SysMacOSX, "drift_removal_elapsed: %.3f current_drift_removal_interval: %.3f predicted_error: %.3f",
+                            1.0e6 * drift_removal_elapsed,
+                            1.0e6 * current_drift_removal_interval,
+                            1.0e6 * predicted_error);
+
+  adjust_required = - (accrued_error + offset_register + predicted_error);
+
+  UTI_DoubleToTimeval(adjust_required, &newadj);
+  UTI_TimevalToDouble(&newadj, &adjustment_requested);
+  rounding_error = adjust_required - adjustment_requested;
+
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
+  }
+
+  UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
+
+  offset_register = rounding_error - old_adjust_remaining - predicted_error;
+
+  T0 = T1;
+}
+
+/* ================================================== */
+
+static void
+stop_adjust(void)
+{
+  struct timeval T1;
+  struct timeval zeroadj, remadj;
+  double adjustment_remaining, adjustment_achieved;
+  double elapsed, elapsed_plus_adjust;
+
+  zeroadj.tv_sec = 0;
+  zeroadj.tv_usec = 0;
+
+  if (PRV_AdjustTime(&zeroadj, &remadj) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
+  }
+
+  if (gettimeofday(&T1, NULL) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
+  }
+
+  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
+  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
+
+  adjustment_achieved = adjustment_requested - adjustment_remaining;
+  elapsed_plus_adjust = elapsed - adjustment_achieved;
+
+  offset_register += current_freq * elapsed_plus_adjust - adjustment_remaining;
+
+  adjustment_requested = 0.0;
+  T0 = T1;
+}
+
+/* ================================================== */
+
+/* Positive offset means system clock is fast of true time, therefore
+   slew backwards */
+
+static void
+accrue_offset(double offset, double corr_rate)
+{
+  stop_adjust();
+  offset_register += offset;
+  start_adjust();
+}
+
+/* ================================================== */
+
+/* Positive offset means system clock is fast of true time, therefore
+   step backwards */
+
+static int
+apply_step_offset(double offset)
+{
+  struct timeval old_time, new_time, T1;
+
+  stop_adjust();
+
+  if (gettimeofday(&old_time, NULL) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
+  }
+
+  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
+
+  if (PRV_SetTime(&new_time, NULL) < 0) {
+    DEBUG_LOG(LOGF_SysMacOSX, "settimeofday() failed");
+    return 0;
+  }
+
+  UTI_AddDoubleToTimeval(&T0, -offset, &T1);
+  T0 = T1;
+
+  start_adjust();
+
+  return 1;
+}
+
+/* ================================================== */
+
+static double
+set_frequency(double new_freq_ppm)
+{
+  stop_adjust();
+  current_freq = new_freq_ppm * 1.0e-6;
+  start_adjust();
+
+  return current_freq * 1.0e6;
+}
+
+/* ================================================== */
+
+static double
+read_frequency(void)
+{
+  return current_freq * 1.0e6;
+}
+
+/* ================================================== */
+
+static void
+get_offset_correction(struct timeval *raw,
+                      double *corr, double *err)
+{
+  stop_adjust();
+  *corr = -offset_register;
+  start_adjust();
+  if (err)
+    *err = 0.0;
+}
+
+/* ================================================== */
+
+/* Cancel systematic drift */
+
+static SCH_TimeoutID drift_removal_id;
+
+/* ================================================== */
+/* This is the timer callback routine which is called periodically to
+ invoke a time adjustment to take out the machine's drift.
+ Otherwise, times reported through this software (e.g. by running
+ ntpdate from another machine) show the machine being correct (since
+ they correct for drift build-up), but any program on this machine
+ that reads the system time will be given an erroneous value, the
+ degree of error depending on how long it is since
+ get_offset_correction was last called. */
+
+static void
+drift_removal_timeout(SCH_ArbitraryArgument not_used)
+{
+
+  stop_adjust();
+
+  if (gettimeofday(&Tdrift, NULL) < 0) {
+    LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
+  }
+
+  current_drift_removal_interval = drift_removal_interval;
+
+  start_adjust();
+
+  drift_removal_id = SCH_AddTimeoutByDelay(drift_removal_interval, drift_removal_timeout, NULL);
+}
+
+/* ================================================== */
+
+/* use est_error to calculate the drift_removal_interval and
+   update the RTC */
+
+static void
+set_sync_status(int synchronised, double est_error, double max_error)
+{
+  double interval;
+
+  if (!synchronised) {
+    drift_removal_interval = MAX(drift_removal_interval, DRIFT_REMOVAL_INTERVAL);
+  } else {
+    if (CNF_GetRtcSync()) {
+      struct timeval now;
+      double rtc_sync_elapsed;
+
+      SCH_GetLastEventTime(NULL, NULL, &now);
+      UTI_DiffTimevalsToDouble(&rtc_sync_elapsed, &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);
+        last_rtc_sync = now;
+        DEBUG_LOG(LOGF_SysMacOSX, "rtc synchronised");
+      }
+    }
+
+    interval = ERROR_WEIGHT * est_error / (fabs(current_freq) + FREQUENCY_RES);
+    drift_removal_interval = MAX(interval, DRIFT_REMOVAL_INTERVAL_MIN);
+
+    DEBUG_LOG(LOGF_SysMacOSX, "est_error: %.3f current_freq: %.3f est drift_removal_interval: %.3f act drift_removal_interval: %.3f",
+                est_error * 1.0e6, current_freq * 1.0e6, interval, drift_removal_interval);
+  }
+
+  if (current_drift_removal_interval / drift_removal_interval > DRIFT_REMOVAL_RESTART_RATIO) {
+    /* recover from a large est_error by resetting the timer */
+    SCH_ArbitraryArgument unused;
+    SCH_RemoveTimeout(drift_removal_id);
+    unused = NULL;
+    drift_removal_timeout(unused);
+  }
+}
+
+/* ================================================== */
+/*
+  Give chronyd real time priority so that time critical calculations
+  are not pre-empted by the kernel.
+*/
+
+static int
+set_realtime(void)
+{
+  /* https://developer.apple.com/library/ios/technotes/tn2169/_index.html */
+
+  mach_timebase_info_data_t timebase_info;
+  double clock2abs;
+  thread_time_constraint_policy_data_t policy;
+  int kr;
+
+  mach_timebase_info(&timebase_info);
+  clock2abs = ((double)timebase_info.denom / (double)timebase_info.numer) * NANOS_PER_MSEC;
+
+  policy.period = 0;
+  policy.computation = (uint32_t)(5 * clock2abs); /* 5 ms of work */
+  policy.constraint = (uint32_t)(10 * clock2abs);
+  policy.preemptible = 0;
+
+  kr = thread_policy_set(
+          pthread_mach_thread_np(pthread_self()),
+          THREAD_TIME_CONSTRAINT_POLICY,
+          (thread_policy_t)&policy,
+          THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+
+  if (kr != KERN_SUCCESS) {
+    LOG(LOGS_WARN, LOGF_SysMacOSX, "Cannot set real-time priority: %d", kr);
+    return -1;
+  }
+  return 0;
+}
+
+/* ================================================== */
+
+void
+SYS_MacOSX_SetScheduler(int SchedPriority)
+{
+  if (SchedPriority) {
+    set_realtime();
+  }
+}
+
+/* ================================================== */
+
+#ifdef FEAT_PRIVDROP
+void SYS_MacOSX_DropRoot(uid_t uid, gid_t gid)
+{
+  PRV_StartHelper();
+
+  UTI_DropRoot(uid, gid);
+}
+#endif
+
+/* ================================================== */
+
+void
+SYS_MacOSX_Initialise(void)
+{
+  clock_initialise();
+
+  lcl_RegisterSystemDrivers(read_frequency, set_frequency,
+                            accrue_offset, apply_step_offset,
+                            get_offset_correction,
+                            NULL /* set_leap */,
+                            set_sync_status);
+
+
+  drift_removal_id = SCH_AddTimeoutByDelay(drift_removal_interval, drift_removal_timeout, NULL);
+}
+
+/* ================================================== */
+
+void
+SYS_MacOSX_Finalise(void)
+{
+  SCH_RemoveTimeout(drift_removal_id);
+
+  clock_finalise();
+}
+
+/* ================================================== */
+
+#endif

sys_macosx.h

@@ -2,33 +2,37 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Richard P. Curnow  1997-2002
- * 
+ * Copyright (C) Richard P. Curnow  1997-2001
+ * Copyright (C) J. Hannken-Illjes  2001
+ * Copyright (C) Bryan Christianson 2015
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
- * 
+ *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- * 
+ *
  **********************************************************************
 
   =======================================================================
 
-  Header file for Solaris driver
+  Header file for MacOS X driver
+
   */
 
-#ifndef GOT_SYS_SUNOS_H
-#define GOT_SYS_SUNOS_H
+#ifndef GOT_SYS_MACOSX_H
+#define GOT_SYS_MACOSX_H
 
-void SYS_SunOS_Initialise(void);
-
-void SYS_SunOS_Finalise(void);
+void SYS_MacOSX_SetScheduler(int SchedPriority);
+void SYS_MacOSX_DropRoot(uid_t uid, gid_t gid);
+void SYS_MacOSX_Initialise(void);
+void SYS_MacOSX_Finalise(void);
 
 #endif

sys_netbsd.c

@@ -4,6 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2001
  * Copyright (C) J. Hannken-Illjes  2001
+ * Copyright (C) Miroslav Lichvar  2015
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -22,176 +23,33 @@
 
   =======================================================================
 
-  Driver file for the NetBSD operating system.
+  Driver file for the NetBSD and FreeBSD operating system.
   */
 
 #include "config.h"
 
-#ifdef __NetBSD__
-
-#include <kvm.h>
-#include <nlist.h>
-#include <fcntl.h>
-#include <assert.h>
-#include <sys/time.h>
-
-#include <stdio.h>
-#include <signal.h>
+#include "sysincl.h"
 
 #include "sys_netbsd.h"
-#include "localp.h"
+#include "sys_timex.h"
 #include "logging.h"
+#include "privops.h"
 #include "util.h"
 
-/* ================================================== */
+/* Maximum frequency offset accepted by the kernel (in ppm) */
+#define MAX_FREQ 500.0
 
-/* 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 */
+/* Minimum assumed rate at which the kernel updates the clock frequency */
+#define MIN_TICK_RATE 100
 
-static double offset_register;
+/* Interval between kernel updates of the adjtime() offset */
+#define ADJTIME_UPDATE_INTERVAL 1.0
 
-/* This register contains the epoch to which the offset is referenced */
+/* Maximum adjtime() slew rate (in ppm) */
+#define MAX_ADJTIME_SLEWRATE 5000.0
 
-static struct timeval T0;
-
-/* This register contains the current estimate of the system
-   frequency, in absolute (NOT ppm) */
-
-static double current_freq;
-
-/* This register contains the number of seconds of adjustment that
-   were passed to adjtime last time it was called. */
-
-static double adjustment_requested;
-
-/* Kernel parameters to calculate adjtime error. */
-
-static int kern_tickadj;
-static long kern_bigadj;
-
-/* ================================================== */
-
-static void
-clock_initialise(void)
-{
-  struct timeval newadj, oldadj;
-
-  offset_register = 0.0;
-  adjustment_requested = 0.0;
-  current_freq = 0.0;
-
-  if (gettimeofday(&T0, NULL) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "gettimeofday() failed");
-  }
-
-  newadj.tv_sec = 0;
-  newadj.tv_usec = 0;
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
-  }
-
-}
-
-/* ================================================== */
-
-static void
-clock_finalise(void)
-{
-  /* Nothing to do yet */
-
-}
-
-/* ================================================== */
-
-static void
-start_adjust(void)
-{
-  struct timeval newadj, oldadj;
-  struct timeval T1;
-  double elapsed, accrued_error;
-  double adjust_required;
-  struct timeval exact_newadj;
-  long delta, tickdelta;
-  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_SysNetBSD, "gettimeofday() failed");
-  }
-
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  accrued_error = elapsed * current_freq;
-  
-  adjust_required = - (accrued_error + offset_register);
-
-  UTI_DoubleToTimeval(adjust_required, &exact_newadj);
-
-  /* At this point, we need to round the required adjustment the
-     same way the kernel does. */
-
-  delta = exact_newadj.tv_sec * 1000000 + exact_newadj.tv_usec;
-  if (delta > kern_bigadj || delta < -kern_bigadj)
-    tickdelta = 10 * kern_tickadj;
-  else
-    tickdelta = kern_tickadj;
-  if (delta % tickdelta)
-	delta = delta / tickdelta * tickdelta;
-  newadj.tv_sec = 0;
-  newadj.tv_usec = delta;
-  UTI_NormaliseTimeval(&newadj);
-
-  /* Add rounding error back onto offset register. */
-  UTI_DiffTimevalsToDouble(&rounding_error, &newadj, &exact_newadj);
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
-  }
-
-  UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
-
-  offset_register = rounding_error - old_adjust_remaining;
-
-  T0 = T1;
-  UTI_TimevalToDouble(&newadj, &adjustment_requested);
-
-}
-
-/* ================================================== */
-
-static void
-stop_adjust(void)
-{
-  struct timeval T1;
-  struct timeval zeroadj, remadj;
-  double adjustment_remaining, adjustment_achieved;
-  double elapsed, elapsed_plus_adjust;
-
-  zeroadj.tv_sec = 0;
-  zeroadj.tv_usec = 0;
-
-  if (adjtime(&zeroadj, &remadj) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
-  }
-
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "gettimeofday() failed");
-  }
-  
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
-
-  adjustment_achieved = adjustment_requested - adjustment_remaining;
-  elapsed_plus_adjust = elapsed - adjustment_achieved;
-
-  offset_register += current_freq * elapsed_plus_adjust - adjustment_remaining;
-
-  adjustment_requested = 0.0;
-  T0 = T1;
-
-}
+/* Minimum offset adjtime() slews faster than MAX_FREQ */
+#define MIN_FASTSLEW_OFFSET 1.0
 
 /* ================================================== */
 
@@ -201,61 +59,20 @@ stop_adjust(void)
 static void
 accrue_offset(double offset, double corr_rate)
 {
-  stop_adjust();
-  offset_register += offset;
-  start_adjust();
+  struct timeval newadj, oldadj;
 
-}
+  UTI_DoubleToTimeval(-offset, &newadj);
 
-/* ================================================== */
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0)
+    LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
 
-/* Positive offset means system clock is fast of true time, therefore
-   step backwards */
-
-static int
-apply_step_offset(double offset)
-{
-  struct timeval old_time, new_time, T1;
-  
-  stop_adjust();
-
-  if (gettimeofday(&old_time, NULL) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "gettimeofday() failed");
+  /* Add the old remaining adjustment if not zero */
+  UTI_TimevalToDouble(&oldadj, &offset);
+  if (offset != 0.0) {
+    UTI_AddDoubleToTimeval(&newadj, offset, &newadj);
+    if (PRV_AdjustTime(&newadj, NULL) < 0)
+      LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
   }
-
-  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
-
-  if (settimeofday(&new_time, NULL) < 0) {
-    DEBUG_LOG(LOGF_SysNetBSD, "settimeofday() failed");
-    return 0;
-  }
-
-  UTI_AddDoubleToTimeval(&T0, offset, &T1);
-  T0 = T1;
-
-  start_adjust();
-
-  return 1;
-}
-
-/* ================================================== */
-
-static double
-set_frequency(double new_freq_ppm)
-{
-  stop_adjust();
-  current_freq = new_freq_ppm * 1.0e-6;
-  start_adjust();
-
-  return current_freq * 1.0e6;
-}
-
-/* ================================================== */
-
-static double
-read_frequency(void)
-{
-  return current_freq * 1.0e6;
 }
 
 /* ================================================== */
@@ -264,11 +81,21 @@ static void
 get_offset_correction(struct timeval *raw,
                       double *corr, double *err)
 {
-  stop_adjust();
-  *corr = -offset_register;
-  start_adjust();
-  if (err)
-    *err = 0.0;
+  struct timeval remadj;
+  double adjustment_remaining;
+
+  if (PRV_AdjustTime(NULL, &remadj) < 0)
+    LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
+
+  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
+
+  *corr = adjustment_remaining;
+  if (err) {
+    if (*corr != 0.0)
+      *err = 1.0e-6 * MAX_ADJTIME_SLEWRATE / ADJTIME_UPDATE_INTERVAL;
+    else
+      *err = 0.0;
+  }
 }
 
 /* ================================================== */
@@ -276,42 +103,10 @@ get_offset_correction(struct timeval *raw,
 void
 SYS_NetBSD_Initialise(void)
 {
-  static struct nlist nl[] = {
-    {"_tickadj"},
-    {"_bigadj"},
-    {NULL}
-  };
-
-  kvm_t *kt;
-
-  kt = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
-  if (!kt) {
-    LOG_FATAL(LOGF_SysNetBSD, "Cannot open kvm");
-  }
-
-  if (kvm_nlist(kt, nl) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "Cannot read kernel symbols");
-  }
-
-  if (kvm_read(kt, nl[0].n_value, (char *)(&kern_tickadj), sizeof(int)) < 0) {
-    LOG_FATAL(LOGF_SysNetBSD, "Cannot read from _tickadj");
-  }
-
-  if (kvm_read(kt, nl[1].n_value, (char *)(&kern_bigadj), sizeof(long)) < 0) {
-    /* kernel doesn't have the symbol, use one second instead */
-    kern_bigadj = 1000000;
-  }
-
-  kvm_close(kt);
-
-  clock_initialise();
-
-  lcl_RegisterSystemDrivers(read_frequency, set_frequency, 
-                            accrue_offset, apply_step_offset,
-                            get_offset_correction,
-                            NULL /* set_leap */,
-                            NULL /* set_sync_status */);
-
+  SYS_Timex_InitialiseWithFunctions(MAX_FREQ, 1.0 / MIN_TICK_RATE,
+                                    NULL, NULL, NULL,
+                                    MIN_FASTSLEW_OFFSET, MAX_ADJTIME_SLEWRATE,
+                                    accrue_offset, get_offset_correction);
 }
 
 /* ================================================== */
@@ -319,10 +114,31 @@ SYS_NetBSD_Initialise(void)
 void
 SYS_NetBSD_Finalise(void)
 {
-  clock_finalise();
+  SYS_Timex_Finalise();
 }
 
 /* ================================================== */
 
+#ifdef FEAT_PRIVDROP
+void
+SYS_NetBSD_DropRoot(uid_t uid, gid_t gid)
+{
+#ifdef NETBSD
+  int fd;
+#endif
 
-#endif /* __NetBSD__ */
+  /* On NetBSD the helper is used only for socket binding, but on FreeBSD
+     it's used also for setting and adjusting the system clock */
+  PRV_StartHelper();
+
+  UTI_DropRoot(uid, gid);
+
+#ifdef NETBSD
+  /* Check if we have write access to /dev/clockctl */
+  fd = open("/dev/clockctl", O_WRONLY);
+  if (fd < 0)
+    LOG_FATAL(LOGF_SysNetBSD, "Can't write to /dev/clockctl");
+  close(fd);
+#endif
+}
+#endif

sys_netbsd.h

@@ -32,4 +32,6 @@ void SYS_NetBSD_Initialise(void);
 
 void SYS_NetBSD_Finalise(void);
 
+void SYS_NetBSD_DropRoot(uid_t uid, gid_t gid);
+
 #endif

sys_solaris.c

@@ -26,420 +26,21 @@
 
 #include "config.h"
 
-#ifdef SOLARIS
-
-#include <kvm.h>
-#include <fcntl.h>
-#include <nlist.h>
-#include <assert.h>
-#include <sys/time.h>
-#include <sys/utsname.h>
-
-#include <stdio.h>
+#include "sysincl.h"
 
+#include "privops.h"
 #include "sys_solaris.h"
-#include "localp.h"
-#include "sched.h"
-#include "logging.h"
+#include "sys_timex.h"
 #include "util.h"
 
 /* ================================================== */
 
-/* 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 */
-
-static double offset_register;
-
-/* This register contains the epoch to which the offset is referenced */
-
-static struct timeval T0;
-
-/* This register contains the current estimate of the system
-   frequency, in absolute (NOT ppm) */
-
-static double current_freq;
-
-/* This register contains the number of seconds of adjustment that
-   were passed to adjtime last time it was called. */
-
-static double adjustment_requested;
-
-/* ================================================== */
-/* On Solaris 2.5 & 2.5.1, passing an argument of zero as the new
-   delta to adjtime does not zero out the adjustment - the remaining
-   adjustment is returned as the old delta arg, but the adjustment keeps
-   running.  To get round this, we set adjustments of +/-1us when we
-   really want zero.  Alternate adjustments are used to avoid a drift
-   from building up. */
-
-static struct timeval zeroes[2] = {
-  {0, 1},
-  {-1, 999999}
-};
-
-static int index=0;
-
-/* If 1, need to run dosynctodr().  If 0, don't */
-static int need_dosynctodr = -1;
-
-
-#define GET_ZERO (zeroes[index^=1])
-
-/* ================================================== */
-
-static void
-clock_initialise(void)
-{
-  struct timeval newadj, oldadj;
-
-  offset_register = 0.0;
-  adjustment_requested = 0.0;
-  current_freq = 0.0;
-
-  if (gettimeofday(&T0, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
-  }
-
-  newadj = GET_ZERO;
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
-  }
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
-  }
-}
-
-/* ================================================== */
-
-static void
-clock_finalise(void)
-{
-  /* Nothing to do yet */
-}
-
-/* ================================================== */
-
-static void
-start_adjust(void)
-{
-  struct timeval newadj, oldadj;
-  struct timeval T1;
-  double elapsed, accrued_error;
-  double adjust_required;
-  struct timeval exact_newadj;
-  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_SysSolaris, "gettimeofday() failed");
-  }
-
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  accrued_error = elapsed * current_freq;
-  
-  adjust_required = - (accrued_error + offset_register);
-
-  UTI_DoubleToTimeval(adjust_required, &exact_newadj);
-
-  /* At this point, we will need to call the adjustment rounding
-     algorithm in the system-specific layer.  For now, just assume the
-     adjustment can be applied exactly. */
-
-  newadj = exact_newadj;
-  
-  /* Want to *add* rounding error back onto offset register */
-  UTI_DiffTimevalsToDouble(&rounding_error, &exact_newadj, &newadj);
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
-  }
-
-  UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
-
-  offset_register = rounding_error - old_adjust_remaining;
-
-  T0 = T1;
-  UTI_TimevalToDouble(&newadj, &adjustment_requested);
-  
-}
-
-/* ================================================== */
-
-static void
-stop_adjust(void)
-{
-  struct timeval T1;
-  struct timeval zeroadj, remadj;
-  double adjustment_remaining, adjustment_achieved;
-  double elapsed, elapsed_plus_adjust;
-
-
-  zeroadj = GET_ZERO;
-
-  if (adjtime(&zeroadj, &remadj) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "adjtime() failed");
-  }
-
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
-  }
-  
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
-
-  adjustment_achieved = adjustment_requested - adjustment_remaining;
-  elapsed_plus_adjust = elapsed - adjustment_achieved;
-
-  offset_register += current_freq * elapsed_plus_adjust - adjustment_remaining;
-
-  adjustment_requested = 0.0;
-  T0 = T1;
-
-}
-
-/* ================================================== */
-
-/* Positive offset means system clock is fast of true time, therefore
-   slew backwards */
-
-static void
-accrue_offset(double offset, double corr_rate)
-{
-  stop_adjust();
-  offset_register += offset;
-  start_adjust();
-}
-
-/* ================================================== */
-
-/* Positive offset means system clock is fast of true time, therefore
-   step backwards */
-
-static int
-apply_step_offset(double offset)
-{
-  struct timeval old_time, new_time, rounded_new_time, T1;
-  double rounding_error;
-  
-  stop_adjust();
-  if (gettimeofday(&old_time, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSolaris, "gettimeofday() failed");
-  }
-
-  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
-
-  /* The settimeofday function (on Solaris 2.5/Sparc20 at least) does
-     not work quite as we would want.  The time we want to set is
-     rounded to the nearest second and that time is used.  Also, the
-     clock appears to start from that second boundary plus about 4ms.
-     For now we'll tolerate this small error. */
-
-  rounded_new_time.tv_usec = 0;
-  if (new_time.tv_usec >= 500000) {
-    rounded_new_time.tv_sec = new_time.tv_sec + 1;
-  } else {
-    rounded_new_time.tv_sec = new_time.tv_sec;
-  }
-
-  UTI_DiffTimevalsToDouble(&rounding_error, &rounded_new_time, &new_time);
-
-  if (settimeofday(&new_time, NULL) < 0) {
-    DEBUG_LOG(LOGF_SysSolaris, "settimeofday() failed");
-    return 0;
-  }
-
-  UTI_AddDoubleToTimeval(&T0, offset, &T1);
-  T0 = T1;
-
-  offset_register += rounding_error;
-
-  start_adjust();
-
-  return 1;
-}
-
-/* ================================================== */
-
-static double
-set_frequency(double new_freq_ppm)
-{
-  stop_adjust();
-  current_freq = new_freq_ppm * 1.0e-6;
-  start_adjust();
-
-  return current_freq * 1.0e6;
-}
-
-/* ================================================== */
-
-static double
-read_frequency(void)
-{
-  return current_freq * 1.0e6;
-}
-
-/* ================================================== */
-
-static void
-get_offset_correction(struct timeval *raw,
-                      double *corr, double *err)
-{
-  stop_adjust();
-  *corr = -offset_register;
-  start_adjust();
-  if (err)
-    *err = 0.0;
-}
-
-/* ================================================== */
-
-static void
-immediate_step(void)
-{
-}
-
-/* ================================================== */
-
-/* Interval in seconds between adjustments to cancel systematic drift */
-#define DRIFT_REMOVAL_INTERVAL (4.0)
-
-static int drift_removal_running = 0;
-static SCH_TimeoutID drift_removal_id;
-
-/* ================================================== */
-/* This is the timer callback routine which is called periodically to
-   invoke a time adjustment to take out the machine's drift.
-   Otherwise, times reported through this software (e.g. by running
-   ntpdate from another machine) show the machine being correct (since
-   they correct for drift build-up), but any program on this machine
-   that reads the system time will be given an erroneous value, the
-   degree of error depending on how long it is since
-   get_offset_correction was last called. */
-
-static void
-drift_removal_timeout(SCH_ArbitraryArgument not_used)
-{
-  stop_adjust();
-  start_adjust();
-  drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
-}
-
-/* ================================================== */
-
-static void
-check_need_dosynctodr(void)
-{
-  struct utsname name;
-  int result;
-  int major, minor, veryminor, n_fields;
-
-  result = uname(&name);
-  if (result < 0) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot use uname to detect Solaris version");
-    need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
-    return;
-  }
-
-  n_fields = sscanf(name.release, "%d.%d.%d\n", &major, &minor, &veryminor);
-
-  if (n_fields < 2) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Solaris version doesn't appear to be of the form X.Y[.Z]");
-    need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
-    return;
-  }
-
-  if (major != 5) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Solaris major version doesn't appear to be 5");
-    need_dosynctodr = 0; /* Assume recent Solaris where it isn't needed */
-    return;
-  }
-
-  /* The 'rule of thumb' is that from Solaris 2.6 onwards, dosynctodr() doesn't
-   * need to be called, and in fact it is counter-productive to do so.  For
-   * earlier versions, it is required. */ 
-
-  if (minor < 6) {
-    need_dosynctodr = 1;
-  } else {
-    need_dosynctodr = 0;
-  }
-  
-}
-
-/* ================================================== */
-
-static void
-set_dosynctodr(unsigned long on_off)
-{
-  static struct nlist nl[] = {
-    {"dosynctodr"},
-    {NULL}
-  };
-
-  kvm_t *kt;
-  unsigned long read_back;
-
-  assert(on_off == 1 || on_off == 0);
-
-  kt = kvm_open(NULL, NULL, NULL, O_RDWR, NULL);
-  if (!kt) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot open kvm to change dosynctodr");
-    return;
-  }
-
-  if (kvm_nlist(kt, nl) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot read dosynctodr in nlist");
-    kvm_close(kt);
-    return;
-  }
-
-  if (kvm_write(kt, nl[0].n_value, (char *)(&on_off), sizeof(unsigned long)) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot write to dosynctodr");
-    kvm_close(kt);
-    return;
-  }
-
-  if (kvm_read(kt, nl[0].n_value, (char *)(&read_back), sizeof(unsigned long)) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSolaris, "Cannot read from dosynctodr");
-    kvm_close(kt);
-    return;
-  }
-
-  kvm_close(kt);
-
-  assert(read_back == on_off);
-}
-
-/* ================================================== */
-
 void
 SYS_Solaris_Initialise(void)
 {
-
-  check_need_dosynctodr();
-
-  /* Need to do KVM stuff to turn off dosynctodr. */
-
-  clock_initialise();
-
-  lcl_RegisterSystemDrivers(read_frequency, set_frequency, 
-                            accrue_offset, apply_step_offset,
-                            get_offset_correction,
-                            NULL /* set_leap */,
-                            NULL /* set_sync_status */);
-
-  /* Turn off the kernel switch that keeps the system clock in step
-     with the non-volatile clock */
-  if (need_dosynctodr) {
-    set_dosynctodr(0);
-  }
-
-  drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
-  drift_removal_running = 1;
+  /* The kernel allows the frequency to be set in the full range off int32_t */
+  SYS_Timex_InitialiseWithFunctions(32500, 1.0 / 100, NULL, NULL, NULL,
+                                    0.0, 0.0, NULL, NULL);
 }
 
 /* ================================================== */
@@ -447,21 +48,16 @@ SYS_Solaris_Initialise(void)
 void
 SYS_Solaris_Finalise(void)
 {
-
-  if (drift_removal_running) {
-    SCH_RemoveTimeout(drift_removal_id);
-  }
-
-  clock_finalise();
-
-  /* When exiting, we want to return the machine to its 'autonomous'
-     tracking mode */
-  if (need_dosynctodr) {
-    set_dosynctodr(1);
-  }
+  SYS_Timex_Finalise();
 }
 
 /* ================================================== */
 
-#endif /* SOLARIS */
-
+#ifdef FEAT_PRIVDROP
+void
+SYS_Solaris_DropRoot(uid_t uid, gid_t gid)
+{
+  PRV_StartHelper();
+  UTI_DropRoot(uid, gid);
+}
+#endif

sys_solaris.h

@@ -31,4 +31,6 @@ void SYS_Solaris_Initialise(void);
 
 void SYS_Solaris_Finalise(void);
 
+void SYS_Solaris_DropRoot(uid_t uid, gid_t gid);
+
 #endif

sys_sunos.c

@@ -1,418 +0,0 @@
-/*
-  chronyd/chronyc - Programs for keeping computer clocks accurate.
-
- **********************************************************************
- * Copyright (C) Richard P. Curnow  1997-2003
- * 
- * 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.
- * 
- **********************************************************************
-
-  =======================================================================
-
-  Driver file for the SunOS 4.1.x operating system.
-  */
-
-#include "config.h"
-
-#ifdef SUNOS
-
-#include <kvm.h>
-#include <fcntl.h>
-#include <nlist.h>
-#include <assert.h>
-#include <sys/time.h>
-
-#include <stdio.h>
-#include <signal.h>
-
-#include "sys_sunos.h"
-#include "localp.h"
-#include "logging.h"
-#include "util.h"
-#include "sched.h"
-
-/* ================================================== */
-
-/* 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 */
-
-static double offset_register;
-
-/* This register contains the epoch to which the offset is referenced */
-
-static struct timeval T0;
-
-/* This register contains the current estimate of the system
-   frequency, in absolute (NOT ppm) */
-
-static double current_freq;
-
-/* This register contains the number of seconds of adjustment that
-   were passed to adjtime last time it was called. */
-
-static double adjustment_requested;
-
-/* Eventually, this needs to be a user-defined parameter - e.g. user
-   might want 5 to get much finer resolution like xntpd.  We stick
-   with a reasonable number so that slewing can work.
-
-   This value has to be a factor of 1 million, otherwise the noddy
-   method we use for rounding an adjustment to the nearest multiple of
-   this value won't work!!
-
-   */
-static unsigned long our_tickadj = 100;
-
-/* ================================================== */
-
-static void
-clock_initialise(void)
-{
-  struct timeval newadj, oldadj;
-
-  offset_register = 0.0;
-  adjustment_requested = 0.0;
-  current_freq = 0.0;
-
-  if (gettimeofday(&T0, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "gettimeofday() failed");
-  }
-
-  newadj.tv_sec = 0;
-  newadj.tv_usec = 0;
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "adjtime() failed");
-  }
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "adjtime() failed");
-  }
-}
-
-/* ================================================== */
-
-static void
-clock_finalise(void)
-{
-  /* Nothing to do yet */
-}
-
-/* ================================================== */
-
-static void
-start_adjust(void)
-{
-  struct timeval newadj, oldadj;
-  struct timeval T1;
-  double elapsed, accrued_error;
-  double adjust_required;
-  struct timeval exact_newadj;
-  double rounding_error;
-  double old_adjust_remaining;
-  long remainder, multiplier;
-
-  /* Determine the amount of error built up since the last adjustment */
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "gettimeofday() failed");
-  }
-
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  accrued_error = elapsed * current_freq;
-  
-  adjust_required = - (accrued_error + offset_register);
-
-  UTI_DoubleToTimeval(adjust_required, &exact_newadj);
-
-  /* At this point, we need to round the required adjustment to the
-     closest multiple of _tickadj --- because SunOS can't process
-     other adjustments exactly and will silently discard the residual.
-     Obviously such behaviour can't be tolerated for us. */
-
-  newadj = exact_newadj;
-  remainder = newadj.tv_usec % our_tickadj;
-  multiplier = newadj.tv_usec / our_tickadj;
-  if (remainder >= (our_tickadj >> 1)) {
-    newadj.tv_usec = (multiplier + 1) * our_tickadj;
-  } else {
-    newadj.tv_usec = multiplier * our_tickadj;
-  }
-
-  UTI_NormaliseTimeval(&newadj);
-  
-  /* Want to *add* rounding error back onto offset register.  Note
-     that the exact adjustment was the offset register *negated* */
-  UTI_DiffTimevalsToDouble(&rounding_error, &newadj, &exact_newadj);
-
-  if (adjtime(&newadj, &oldadj) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "adjtime() failed");
-  }
-
-  UTI_TimevalToDouble(&oldadj, &old_adjust_remaining);
-
-  offset_register = rounding_error - old_adjust_remaining;
-
-  T0 = T1;
-  UTI_TimevalToDouble(&newadj, &adjustment_requested);
-
-}
-
-/* ================================================== */
-
-static void
-stop_adjust(void)
-{
-  struct timeval T1;
-  struct timeval zeroadj, remadj;
-  double adjustment_remaining, adjustment_achieved;
-  double gap;
-  double elapsed, elapsed_plus_adjust;
-
-  zeroadj.tv_sec = 0;
-  zeroadj.tv_usec = 0;
-
-  if (adjtime(&zeroadj, &remadj) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "adjtime() failed");
-  }
-
-  if (gettimeofday(&T1, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "gettimeofday() failed");
-  }
-  
-  UTI_DiffTimevalsToDouble(&elapsed, &T1, &T0);
-  UTI_TimevalToDouble(&remadj, &adjustment_remaining);
-
-  adjustment_achieved = adjustment_requested - adjustment_remaining;
-  elapsed_plus_adjust = elapsed - adjustment_achieved;
-
-  offset_register += current_freq * elapsed_plus_adjust - adjustment_remaining;
-
-  adjustment_requested = 0.0;
-  T0 = T1;
-
-}
-
-/* ================================================== */
-
-/* Positive offset means system clock is fast of true time, therefore
-   slew backwards */
-
-static void
-accrue_offset(double offset, double corr_rate)
-{
-  stop_adjust();
-  offset_register += offset;
-  start_adjust();
-}
-
-/* ================================================== */
-
-/* Positive offset means system clock is fast of true time, therefore
-   step backwards */
-
-static int
-apply_step_offset(double offset)
-{
-  struct timeval old_time, new_time, T1;
-  
-  stop_adjust();
-  if (gettimeofday(&old_time, NULL) < 0) {
-    LOG_FATAL(LOGF_SysSunOS, "gettimeofday() failed");
-  }
-
-  UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
-
-  if (settimeofday(&new_time, NULL) < 0) {
-    DEBUG_LOG(LOGF_SysSunOS, "settimeofday() failed");
-    return 0;
-  }
-
-  UTI_AddDoubleToTimeval(&T0, offset, &T1);
-  T0 = T1;
-
-  start_adjust();
-
-  return 1;
-}
-
-/* ================================================== */
-
-static double
-set_frequency(double new_freq_ppm)
-{
-  stop_adjust();
-  current_freq = new_freq_ppm * 1.0e-6;
-  start_adjust();
-
-  return current_freq * 1.0e6;
-}
-
-/* ================================================== */
-
-static double
-read_frequency(void)
-{
-  return current_freq * 1.0e6;
-}
-
-/* ================================================== */
-
-static void
-get_offset_correction(struct timeval *raw,
-                      double *corr, double *err)
-{
-  stop_adjust();
-  *corr = -offset_register;
-  start_adjust();
-  if (err)
-    *err = 0.0;
-}
-
-/* ================================================== */
-
-static void
-immediate_step(void)
-{
-}
-
-/* ================================================== */
-
-/* Interval in seconds between adjustments to cancel systematic drift */
-#define DRIFT_REMOVAL_INTERVAL (4.0)
-
-static int drift_removal_running = 0;
-static SCH_TimeoutID drift_removal_id;
-
-/* ================================================== */
-/* This is the timer callback routine which is called periodically to
-   invoke a time adjustment to take out the machine's drift.
-   Otherwise, times reported through this software (e.g. by running
-   ntpdate from another machine) show the machine being correct (since
-   they correct for drift build-up), but any program on this machine
-   that reads the system time will be given an erroneous value, the
-   degree of error depending on how long it is since
-   get_offset_correction was last called. */
-
-static void
-drift_removal_timeout(SCH_ArbitraryArgument not_used)
-{
-  stop_adjust();
-  start_adjust();
-  drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
-}
-
-/* ================================================== */
-
-static void
-setup_kernel(unsigned long on_off)
-{
-  static struct nlist nl[] = {
-    {"_dosynctodr"},
-    {"_tick"},
-    {"_tickadj"},
-    {NULL}
-  };
-
-  kvm_t *kt;
-  unsigned long read_back;
-  unsigned long our_tick = 10000;
-  unsigned long default_tickadj = 625;
-
-  assert(on_off == 1 || on_off == 0);
-
-  kt = kvm_open(NULL, NULL, NULL, O_RDWR, NULL);
-  if (!kt) {
-    LOG(LOGS_ERR, LOGF_SysSunOS, "Cannot open kvm");
-    return;
-  }
-
-  if (kvm_nlist(kt, nl) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSunOS, "Cannot read kernel symbols");
-    kvm_close(kt);
-    return;
-  }
-
-  if (kvm_write(kt, nl[0].n_value, (char *)(&on_off), sizeof(unsigned long)) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSunOS, "Cannot write to _dosynctodr");
-    kvm_close(kt);
-    return;
-  }
-
-  if (kvm_write(kt, nl[1].n_value, (char *)(&our_tick), sizeof(unsigned long)) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSunOS, "Cannot write to _tick");
-    kvm_close(kt);
-    return;
-  }
-
-  if (kvm_write(kt, nl[2].n_value,
-                (char *)(on_off ? &default_tickadj : &our_tickadj),
-                sizeof(unsigned long)) < 0) {
-    LOG(LOGS_ERR, LOGF_SysSunOS, "Cannot write to _tickadj");
-    kvm_close(kt);
-    return;
-  }
-
-  kvm_close(kt);
-}
-
-/* ================================================== */
-
-void
-SYS_SunOS_Initialise(void)
-{
-
-  /* Need to do KVM stuff to turn off dosynctodr. */
-
-  clock_initialise();
-
-  lcl_RegisterSystemDrivers(read_frequency, set_frequency, 
-                            accrue_offset, apply_step_offset,
-                            get_offset_correction,
-                            NULL /* set_leap */,
-                            NULL /* set_sync_status */);
-
-  /* Turn off the kernel switch that keeps the system clock in step
-     with the non-volatile clock */
-  setup_kernel(0);
-
-  drift_removal_id = SCH_AddTimeoutByDelay(DRIFT_REMOVAL_INTERVAL, drift_removal_timeout, NULL);
-  drift_removal_running = 1;
-
-}
-
-/* ================================================== */
-
-void
-SYS_SunOS_Finalise(void)
-{
-
-  if (drift_removal_running) {
-    SCH_RemoveTimeout(drift_removal_id);
-  }
-
-  /* Turn dosynctodr back on?? */
-
-  clock_finalise();
-
-  /* When exiting, we want to return the machine to its 'autonomous'
-     tracking mode */
-  setup_kernel(1);
-}
-
-/* ================================================== */
-
-
-#endif /* SUNOS */

sys_timex.c

@@ -0,0 +1,249 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2003
+ * Copyright (C) Miroslav Lichvar  2009-2012, 2014-2015
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Driver for systems that implement the adjtimex()/ntp_adjtime() system call
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "conf.h"
+#include "privops.h"
+#include "sys_generic.h"
+#include "sys_timex.h"
+#include "logging.h"
+
+#ifdef PRIVOPS_ADJUSTTIMEX
+#define NTP_ADJTIME PRV_AdjustTimex
+#define NTP_ADJTIME_NAME "ntp_adjtime"
+#else
+#ifdef LINUX
+#define NTP_ADJTIME adjtimex
+#define NTP_ADJTIME_NAME "adjtimex"
+#else
+#define NTP_ADJTIME ntp_adjtime
+#define NTP_ADJTIME_NAME "ntp_adjtime"
+#endif
+#endif
+
+/* Maximum frequency offset accepted by the kernel (in ppm) */
+#define MAX_FREQ 500.0
+
+/* Frequency scale to convert from ppm to the timex freq */
+#define FREQ_SCALE (double)(1 << 16)
+
+/* Threshold for the timex maxerror when the kernel sets the UNSYNC flag */
+#define MAX_SYNC_ERROR 16.0
+
+/* Minimum assumed rate at which the kernel updates the clock frequency */
+#define MIN_TICK_RATE 100
+
+/* Saved timex status */
+static int status;
+
+/* ================================================== */
+
+static double
+read_frequency(void)
+{
+  struct timex txc;
+
+  txc.modes = 0;
+
+  SYS_Timex_Adjust(&txc, 0);
+
+  return txc.freq / -FREQ_SCALE;
+}
+
+/* ================================================== */
+
+static double
+set_frequency(double freq_ppm)
+{
+  struct timex txc;
+
+  txc.modes = MOD_FREQUENCY;
+  txc.freq = freq_ppm * -FREQ_SCALE;
+
+  SYS_Timex_Adjust(&txc, 0);
+
+  return txc.freq / -FREQ_SCALE;
+}
+
+/* ================================================== */
+
+static void
+set_leap(int leap)
+{
+  struct timex txc;
+  int applied;
+
+  applied = 0;
+  if (!leap) {
+    txc.modes = 0;
+    if (SYS_Timex_Adjust(&txc, 1) == TIME_WAIT)
+      applied = 1;
+  }
+
+  status &= ~(STA_INS | STA_DEL);
+
+  if (leap > 0)
+    status |= STA_INS;
+  else if (leap < 0)
+    status |= STA_DEL;
+
+  txc.modes = MOD_STATUS;
+  txc.status = status;
+
+  SYS_Timex_Adjust(&txc, 0);
+
+  LOG(LOGS_INFO, LOGF_SysTimex, "System clock status %s leap second",
+      leap ? (leap > 0 ? "set to insert" : "set to delete") :
+      (applied ? "reset after" : "set to not insert/delete"));
+}
+
+/* ================================================== */
+
+static void
+set_sync_status(int synchronised, double est_error, double max_error)
+{
+  struct timex txc;
+
+  if (synchronised) {
+    if (est_error > MAX_SYNC_ERROR)
+      est_error = MAX_SYNC_ERROR;
+    if (max_error >= MAX_SYNC_ERROR) {
+      max_error = MAX_SYNC_ERROR;
+      synchronised = 0;
+    }
+  } else {
+    est_error = max_error = MAX_SYNC_ERROR;
+  }
+
+#ifdef LINUX
+  /* On Linux clear the UNSYNC flag only if rtcsync is enabled */
+  if (!CNF_GetRtcSync())
+    synchronised = 0;
+#endif
+
+  if (synchronised)
+    status &= ~STA_UNSYNC;
+  else
+    status |= STA_UNSYNC;
+
+  txc.modes = MOD_STATUS | MOD_ESTERROR | MOD_MAXERROR;
+  txc.status = status;
+  txc.esterror = est_error * 1.0e6;
+  txc.maxerror = max_error * 1.0e6;
+
+  SYS_Timex_Adjust(&txc, 1);
+}
+
+/* ================================================== */
+
+static void
+initialise_timex(void)
+{
+  struct timex txc;
+
+  status = STA_UNSYNC;
+
+  /* Reset PLL offset */
+  txc.modes = MOD_OFFSET | MOD_STATUS;
+  txc.status = STA_PLL | status;
+  txc.offset = 0;
+  SYS_Timex_Adjust(&txc, 0);
+
+  /* Turn PLL off */
+  txc.modes = MOD_STATUS;
+  txc.status = status;
+  SYS_Timex_Adjust(&txc, 0);
+}
+
+/* ================================================== */
+
+void
+SYS_Timex_Initialise(void)
+{
+  SYS_Timex_InitialiseWithFunctions(MAX_FREQ, 1.0 / MIN_TICK_RATE, NULL, NULL, NULL,
+                                    0.0, 0.0, NULL, NULL);
+}
+
+/* ================================================== */
+
+void
+SYS_Timex_InitialiseWithFunctions(double max_set_freq_ppm, double max_set_freq_delay,
+                                  lcl_ReadFrequencyDriver sys_read_freq,
+                                  lcl_SetFrequencyDriver sys_set_freq,
+                                  lcl_ApplyStepOffsetDriver sys_apply_step_offset,
+                                  double min_fastslew_offset, double max_fastslew_rate,
+                                  lcl_AccrueOffsetDriver sys_accrue_offset,
+                                  lcl_OffsetCorrectionDriver sys_get_offset_correction)
+{
+  initialise_timex();
+
+  SYS_Generic_CompleteFreqDriver(max_set_freq_ppm, max_set_freq_delay,
+                                 sys_read_freq ? sys_read_freq : read_frequency,
+                                 sys_set_freq ? sys_set_freq : set_frequency,
+                                 sys_apply_step_offset,
+                                 min_fastslew_offset, max_fastslew_rate,
+                                 sys_accrue_offset, sys_get_offset_correction,
+                                 set_leap, set_sync_status);
+}
+
+/* ================================================== */
+
+void
+SYS_Timex_Finalise(void)
+{
+  SYS_Generic_Finalise();
+}
+
+/* ================================================== */
+
+int
+SYS_Timex_Adjust(struct timex *txc, int ignore_error)
+{
+  int state;
+
+#ifdef SOLARIS
+  /* The kernel seems to check the constant even when it's not being set */
+  if (!(txc->modes & MOD_TIMECONST))
+    txc->constant = 10;
+#endif
+
+  state = NTP_ADJTIME(txc);
+
+  if (state < 0) {
+    if (!ignore_error)
+      LOG_FATAL(LOGF_SysTimex, NTP_ADJTIME_NAME"(0x%x) failed : %s",
+                txc->modes, strerror(errno));
+    else
+      DEBUG_LOG(LOGF_SysTimex, NTP_ADJTIME_NAME"(0x%x) failed : %s",
+                txc->modes, strerror(errno));
+  }
+
+  return state;
+}

sys_timex.h

@@ -0,0 +1,48 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2015
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Header file for a driver based on the adjtimex()/ntp_adjtime() function
+  */
+
+#ifndef GOT_SYS_TIMEX_H
+#define GOT_SYS_TIMEX_H
+
+#include "localp.h"
+
+extern void SYS_Timex_Initialise(void);
+
+/* Initialise with some driver functions replaced with special versions */
+extern void SYS_Timex_InitialiseWithFunctions(double max_set_freq_ppm, double max_set_freq_delay,
+                                              lcl_ReadFrequencyDriver sys_read_freq,
+                                              lcl_SetFrequencyDriver sys_set_freq,
+                                              lcl_ApplyStepOffsetDriver sys_apply_step_offset,
+                                              double min_fastslew_offset, double max_fastslew_rate,
+                                              lcl_AccrueOffsetDriver sys_accrue_offset,
+                                              lcl_OffsetCorrectionDriver sys_get_offset_correction);
+
+extern void SYS_Timex_Finalise(void);
+
+/* Wrapper for adjtimex()/ntp_adjtime() */
+extern int SYS_Timex_Adjust(struct timex *txc, int ignore_error);
+
+#endif  /* GOT_SYS_GENERIC_H */

sysincl.h

@@ -29,22 +29,17 @@
 #ifndef GOT_SYSINCL_H
 #define GOT_SYSINCL_H
 
-#if defined (SOLARIS) || defined(SUNOS) || defined(LINUX) || defined(__NetBSD__)
-
-#if !defined(__NetBSD__) && !defined(__FreeBSD__)
-#include <alloca.h>
-#endif
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <float.h>
-#if !defined(__FreeBSD__)
-#include <malloc.h>
-#endif
+#include <glob.h>
+#include <grp.h>
 #include <math.h>
 #include <netdb.h>
 #include <netinet/in.h>
+#include <pwd.h>
 #include <resolv.h>
 #include <signal.h>
 #include <stdarg.h>
@@ -59,8 +54,14 @@
 #include <sys/types.h>
 #include <sys/un.h>
 #include <sys/shm.h>
+#include <sys/wait.h>
 #include <syslog.h>
 #include <time.h>
+#include <unistd.h>
+
+#if defined(LINUX) || defined(FREEBSD) || defined(NETBSD) || defined(SOLARIS)
+#include <sys/timex.h>
+#endif
 
 #ifdef HAVE_INTTYPES_H
 #include <inttypes.h>
@@ -70,62 +71,9 @@
 /* Tough */
 #endif
 
-/* One or other of these to make getsid() visible */
-#define __EXTENSIONS__ 1
-#define __USE_XOPEN_EXTENDED 1
-
-#include <unistd.h>
-
-#endif
-
 #ifdef FEAT_IPV6
 /* For inet_ntop() */
 #include <arpa/inet.h>
 #endif
 
-#if defined (SOLARIS) || defined(SUNOS)
-/* Only needed on these platforms, and doesn't exist on some Linux
-   versions. */
-#include <nlist.h>
-#endif
-
-#if defined (WINNT)
-
-/* Designed to work with the GCC from the GNAT-3.10 for Win32
-   distribution */
-
-#define Win32_Winsock
-#include <assert.h>
-#include <ctype.h>
-
-#if 1
-/* Cheat and inline the necessary bits from <errno.h>.  We don't
-   include it directly because it redefines some EXXX constants that
-   conflict with <windows32/sockets.h> (included by <windows.h>) */
-
-int*	_errno();
-int*	__doserrno();
-
-#define	errno		(*_errno())
-#define	_doserrno	(*__doserrno())
-
-#define ENOENT 2
-#else
-
-#include <errno.h>
-#endif
-
-
-#include <float.h>
-#include <math.h>
-#include <signal.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <time.h>
-#include <windows.h>
-#endif
-
 #endif /* GOT_SYSINCL_H */

test/compilation/001-features

@@ -5,8 +5,14 @@
 cd ../..
 
 for opts in \
+	"--enable-debug" \
+	"--enable-scfilter" \
 	"--disable-asyncdns" \
+	"--disable-ipv6" \
+	"--disable-privdrop" \
+	"--disable-readline" \
 	"--disable-rtc" \
+	"--disable-sechash" \
 	"--disable-cmdmon" \
 	"--disable-ntp" \
 	"--disable-refclock" \
@@ -15,5 +21,5 @@ for opts in \
 	"--disable-cmdmon --disable-ntp --disable-refclock"
 do
 	./configure $opts
-	make || exit 1
+	make "$@" || exit 1
 done