doc: update NEWS

Sources that overlap trusted sources should be displayed in the chronyc
sources report with the '-' symbol and they shouldn't trigger a
replacement.

.gitignore

@@ -7,18 +7,19 @@
 tags
 /RELEASES
 /Makefile
-/chrony.conf.5
-/chrony.info
-/chrony.html
-/chrony.texi
-/chrony.txt
 /chronyc
-/chronyc.1
 /chronyd
-/chronyd.8
 /config.h
 /config.log
+/doc/Makefile
+/doc/*.html
+/doc/*.man
+/doc/*.man.in
+/doc/*.txt
 /getdate.c
 /version.h
 /test/simulation/clknetsim
 /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@
 
@@ -74,11 +71,12 @@ $(HASH_OBJ) : $(patsubst %.o,%.c,$(HASH_OBJ))
 
 distclean : clean
 	-rm -f .DS_Store
-	-rm -f Makefile
+	-rm -f Makefile config.h config.log
-	-rm -f chrony.conf.5 chrony.texi chronyc.1 chronyd.8
+	$(MAKE) -C doc distclean
+	$(MAKE) -C test/unit distclean
 
 clean :
-	-rm -f *.o *.s chronyc chronyd core *~ chrony.info chrony.html chrony.txt
+	-rm -f *.o *.s chronyc chronyd core *~
 	-rm -rf .deps
 	-rm -rf *.dSYM
 
@@ -96,9 +94,6 @@ install: chronyd chronyc
 	[ -d $(DESTDIR)$(SYSCONFDIR) ] || mkdir -p $(DESTDIR)$(SYSCONFDIR)
 	[ -d $(DESTDIR)$(SBINDIR) ] || mkdir -p $(DESTDIR)$(SBINDIR)
 	[ -d $(DESTDIR)$(BINDIR) ] || mkdir -p $(DESTDIR)$(BINDIR)
-	[ -d $(DESTDIR)$(MANDIR)/man1 ] || mkdir -p $(DESTDIR)$(MANDIR)/man1
-	[ -d $(DESTDIR)$(MANDIR)/man5 ] || mkdir -p $(DESTDIR)$(MANDIR)/man5
-	[ -d $(DESTDIR)$(MANDIR)/man8 ] || mkdir -p $(DESTDIR)$(MANDIR)/man8
 	[ -d $(DESTDIR)$(CHRONYVARDIR) ] || mkdir -p $(DESTDIR)$(CHRONYVARDIR)
 	if [ -f $(DESTDIR)$(SBINDIR)/chronyd ]; then rm -f $(DESTDIR)$(SBINDIR)/chronyd ; fi
 	if [ -f $(DESTDIR)$(BINDIR)/chronyc ]; then rm -f $(DESTDIR)$(BINDIR)/chronyc ; fi
@@ -106,12 +101,13 @@ install: chronyd chronyc
 	chmod 755 $(DESTDIR)$(SBINDIR)/chronyd
 	cp chronyc $(DESTDIR)$(BINDIR)/chronyc
 	chmod 755 $(DESTDIR)$(BINDIR)/chronyc
-	cp chronyc.1 $(DESTDIR)$(MANDIR)/man1
+	$(MAKE) -C doc install
-	chmod 644 $(DESTDIR)$(MANDIR)/man1/chronyc.1
+
-	cp chronyd.8 $(DESTDIR)$(MANDIR)/man8
+docs :
-	chmod 644 $(DESTDIR)$(MANDIR)/man8/chronyd.8
+	$(MAKE) -C doc docs
-	cp chrony.conf.5 $(DESTDIR)$(MANDIR)/man5
+
-	chmod 644 $(DESTDIR)$(MANDIR)/man5/chrony.conf.5
+install-docs :
+	$(MAKE) -C doc install-docs
 
 %.o : %.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
@@ -120,30 +116,9 @@ install: chronyd chronyc
 	$(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

NEWS

@@ -1,3 +1,68 @@
+New in version 2.4.1
+====================
+
+Bug fixes
+---------
+* Fix processing of kernel timestamps on non-Linux systems
+* Fix crash with smoothtime directive
+* Fix validation of refclock sample times
+* Fix parsing of refclock directive
+
+New in version 2.4
+==================
+
+Enhancements
+------------
+* Add orphan option to local directive for orphan mode compatible with ntpd
+* Add distance option to local directive to set activation threshold
+  (1 second by default)
+* Add maxdrift directive to set maximum allowed drift of system clock
+* Try to replace NTP sources exceeding maximum distance
+* Randomise source replacement to avoid getting stuck with bad sources
+* Randomise selection of sources from pools on start
+* Ignore reference timestamp as ntpd doesn't always set it correctly
+* Modify tracking report to use same values as seen by NTP clients
+* Add -c option to chronyc to write reports in CSV format
+* Provide detailed manual pages
+
+Bug fixes
+---------
+* Fix SOCK refclock to work correctly when not specified as last refclock
+* Fix initstepslew and -q/-Q options to accept time from own NTP clients
+* Fix authentication with keys using 512-bit hash functions
+* Fix crash on exit when multiple signals are received
+* Fix conversion of very small floating-point numbers in command packets
+
+Removed features
+----------------
+* Drop documentation in Texinfo format
+
+New in version 2.3
+==================
+
+Enhancements
+------------
+* Add support for NTP and command response rate limiting
+* Add support for dropping root privileges on Mac OS X, FreeBSD, Solaris
+* Add require and trust options for source selection
+* Enable logchange by default (1 second threshold)
+* Set RTC on Mac OS X with rtcsync directive
+* Allow binding to NTP port after dropping root privileges on NetBSD
+* Drop CAP_NET_BIND_SERVICE capability on Linux when NTP port is disabled
+* Resolve names in separate process when seccomp filter is enabled
+* Replace old records in client log when memory limit is reached
+* Don't reveal local time and synchronisation state in client packets
+* Don't keep client sockets open for longer than necessary
+* Ignore poll in KoD RATE packets as ntpd doesn't always set it correctly
+* Warn when using keys shorter than 80 bits
+* Add keygen command to generate random keys easily
+* Add serverstats command to report NTP and command packet statistics
+
+Bug fixes
+---------
+* Fix clock correction after making step on Mac OS X
+* Fix building on Solaris
+
 New in version 2.2.1
 ====================
 

README

@@ -53,7 +53,7 @@ ready-formatted plain text (chrony.txt) in the distribution.
 There is also information available on the chrony web pages, accessible
 through the URL 
 
-    http://chrony.tuxfamily.org/
+    https://chrony.tuxfamily.org/
 
 Where are new versions announced?
 =================================
@@ -84,6 +84,12 @@ 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
 =======
 
@@ -105,6 +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 :
 
@@ -130,6 +140,8 @@ Erik Bryer <ebryer@spots.ab.ca>
 
 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.
@@ -216,6 +228,9 @@ Andreas Piesk <apiesk@virbus.de>
 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

@@ -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

@@ -103,6 +103,12 @@ ARR_GetElement(ARR_Instance array, unsigned int index)
 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

@@ -91,11 +91,10 @@
 #define REQ_SMOOTHING 51
 #define REQ_SMOOTHTIME 52
 #define REQ_REFRESH 53
-#define N_REQUEST_TYPES 54
+#define REQ_SERVER_STATS 54
-
+#define REQ_CLIENT_ACCESSES_BY_INDEX2 55
-/* Special utoken value used to log on with first exchange being the
+#define REQ_LOCAL2 56
-   password.  (This time value has long since gone by) */
+#define N_REQUEST_TYPES 57
-#define SPECIAL_UTOKEN 0x10101010
 
 /* Structure used to exchange timevals independent on size of time_t */
 typedef struct {
@@ -213,6 +212,8 @@ typedef struct {
 typedef struct {
   int32_t on_off;
   int32_t stratum;
+  Float distance;
+  int32_t orphan;
   int32_t EOR;
 } REQ_Local;
 
@@ -243,6 +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;
@@ -284,7 +287,7 @@ typedef struct {
 
 typedef struct {
   uint32_t first_index;
-  uint32_t n_indices;
+  uint32_t n_clients;
   int32_t EOR;
 } REQ_ClientAccessesByIndex;
 
@@ -335,9 +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, smoothing report, smoothtime command
+   makestep, smoothing, smoothtime
 
-   Authentication was removed later in version 6.
+   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
@@ -351,7 +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
 
 /* ================================================== */
@@ -431,7 +440,9 @@ typedef struct {
 #define RPY_MANUAL_LIST 11
 #define RPY_ACTIVITY 12
 #define RPY_SMOOTHING 13
-#define N_REPLY_TYPES 14
+#define RPY_SERVER_STATS 14
+#define RPY_CLIENT_ACCESSES_BY_INDEX2 15
+#define N_REPLY_TYPES 16
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -478,6 +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;
@@ -545,11 +558,14 @@ typedef struct {
 
 typedef struct {
   IPAddr ip;
-  uint32_t client_hits;
+  uint32_t ntp_hits;
-  uint32_t peer_hits;
+  uint32_t cmd_hits;
-  uint32_t cmd_hits_auth;
+  uint32_t ntp_drops;
-  uint32_t cmd_hits_normal;
+  uint32_t cmd_drops;
-  uint32_t cmd_hits_bad;
+  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;
@@ -562,6 +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 {
@@ -623,6 +648,7 @@ 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;

chrony.conf.5.in

@@ -1,67 +0,0 @@
-.TH chrony.conf 5 "@MAN_DATE@" "chrony @VERSION@" "Configuration Files"
-.SH NAME
-chrony.conf \- chronyd configuration file
-
-.SH SYNOPSIS
-.B @SYSCONFDIR@/chrony.conf
-
-.SH DESCRIPTION
-\fIchrony\fR is a pair of programs for maintaining the accuracy of computer
-clocks. \fIchronyd\fR is a background daemon program that can be started at
-boot time.
-
-Assuming that you have found some servers, you need to set up a
-configuration file to run \fIchrony\fR.  The (compiled-in) default location
-for this file is \fB@SYSCONFDIR@/chrony.conf\fR.  Assuming that your NTP
-servers are called `foo.example.net', `bar.example.net' and `baz.example.net',
-your \fBchrony.conf\fR file could contain as a minimum
-
-.EX
-     server foo.example.net
-     server bar.example.net
-     server baz.example.net
-.EE
-
-However, you will probably want to include some of the other directives
-described in detail in the documentation supplied with the distribution
-(\fIchrony.txt\fR and \fIchrony.texi\fR). The following directives may be
-particularly useful : `driftfile',  `makestep', `rtcsync'.  Also, the `iburst'
-server option is useful to speed up the initial synchronization.  The smallest
-useful configuration file would look something like
-
-.EX
-     server foo.example.net iburst
-     server bar.example.net iburst
-     server baz.example.net iburst
-     driftfile @CHRONYVARDIR@/drift
-     makestep 1.0 3
-     rtcsync
-.EE
-
-When using a pool of NTP servers (one name is used for multiple servers which
-may change over time), it's better to specify them with the `pool' directive
-instead of multiple `server' directives.  The configuration file could in this
-case look like
-
-.EX
-     pool pool.ntp.org iburst
-     driftfile @CHRONYVARDIR@/drift
-     makestep 1.0 3
-     rtcsync
-.EE
-
-.SH "SEE ALSO"
-.BR chronyc(1),
-.BR chronyd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
-Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
-for details.
-
-The complete chrony documentation is supplied in texinfo format.
-

chronyc.1.in

@@ -1,74 +0,0 @@
-.TH CHRONYC 1 "@MAN_DATE@" "chrony @VERSION@" "User's Manual"
-.SH NAME
-chronyc \- command-line interface for chronyd
-
-.SH SYNOPSIS
-.B chronyc
-[\fIOPTIONS\fR]
-
-.SH DESCRIPTION
-\fIchrony\fR is a pair of programs for maintaining the accuracy of computer
-clocks.
-
-\fBchronyc\fR is a command-line interface program which can be used to
-monitor \fIchronyd\fR's performance and to change various operating
-parameters whilst it is running.
-
-.SH USAGE
-A detailed description of all commands supported by \fBchronyc\fR is available
-via the documentation supplied with the distribution (\fIchrony.txt\fR and
-\fIchrony.texi\fR).
-
-.SH OPTIONS
-A summary of the options supported by \fBchronyc\fR is included below.
-
-.TP
-\fB\-h\fR \fIhostname\fR
-specify hostname or comma-separated list of addresses
-(default @CHRONYSOCKDIR@/chronyd.sock,127.0.0.1,::1)
-.TP
-\fB\-p\fR \fIport-number\fR
-specify port-number
-.TP
-\fB\-n\fR
-display raw IP addresses (don't attempt to look up hostnames)
-.TP
-\fB\-d\fR
-print debugging messages (if compiled with debugging support)
-.TP
-\fB\-4\fR
-resolve hostnames only to IPv4 addresses
-.TP
-\fB\-6\fR
-resolve hostnames only to IPv6 addresses
-.TP
-\fB\-m\fR
-allow multiple commands to be specified on the command line.  Each argument
-will be interpreted as a whole command.
-.TP
-\fB\-f\fR \fIconf-file\fR
-this option is ignored and is provided only for compatibility.
-.TP
-\fB\-a\fR
-this option is ignored and is provided only for compatibility.
-.TP
-\fIcommand\fR
-specify command.  If no command is given, chronyc will read commands
-interactively.
-
-.SH BUGS
-To report bugs, please visit \fIhttp://chrony.tuxfamily.org\fR
-
-.SH "SEE ALSO"
-.BR chronyd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing
-Man Pages Project".  Please see \fIhttp://www.netmeister.org/misc/m2p2/index.html\fR
-for details.
-
-The complete chrony documentation is supplied in texinfo format.

chronyd.8.in

@@ -1,156 +0,0 @@
-.TH CHRONYD 8 "@MAN_DATE@" "chrony @VERSION@" "System Administration"
-.SH NAME
-chronyd \- chrony background daemon
-
-.SH SYNOPSIS
-.B chronyd
-[\fIOPTIONS\fR] [\fIconfiguration commands\fR]
-
-.SH DESCRIPTION
-\fIchrony\fR is a pair of programs for maintaining the accuracy of computer
-clocks. \fBchronyd\fR is a background daemon program that can be started at boot
-time.
-
-\fBchronyd\fR is a daemon which runs in background on the
-system.  It obtains measurements (e.g. via the network) of the
-system's offset relative to other systems, and adjusts the system
-time accordingly.  For isolated systems, the user can periodically
-enter the correct time by hand (using \fIchronyc\fR).  In either case,
-\fBchronyd\fR determines the rate at which the computer
-gains or loses time, and compensates for this.
-
-.SH USAGE
-\fBchronyd\fR is usually started at boot-time and requires superuser
-privileges.
-
-If \fBchronyd\fR has been installed to its default location
-\fI@SBINDIR@/chronyd\fR, starting it is simply a matter of entering the
-command:
-
-\fI@SBINDIR@/chronyd\fR
-
-Information messages and warnings will be logged to syslog.
-
-If no configuration commands are specified on the command line,
-\fBchronyd\fR will read the commands from the configuration file
-(default \fI@SYSCONFDIR@/chrony.conf\fR).
-
-.SH OPTIONS
-A summary of the options supported by \fBchronyd\fR is included below.
-
-.TP
-\fB\-P\fR \fIpriority\fR
-On Linux, this option will select the SCHED_FIFO real-time scheduler at the
-specified priority (which must be between 0 and 100).  On Mac OS X, this
-option must have either a value of 0 (the default) to disable the thread
-time constraint policy or 1 for the policy to be enabled.  Other systems do not
-support this option.
-.TP
-.B \-m
-This option will lock chronyd into RAM so that it will never be paged out.
-This mode is only supported on Linux.
-.TP
-.B \-n
-When run in this mode, the program will not detach itself from the
-terminal.
-.TP
-.B \-d
-When run in this mode, the program will not detach itself from the
-terminal, and all messages will be sent to the terminal instead of
-to syslog.  When \fBchronyd\fR was compiled with debugging support,
-this option can be used twice to print also debugging messages.
-.TP
-\fB\-f\fR \fIconf-file\fR
-This option can be used to specify an alternate location for the
-configuration file (default \fI@SYSCONFDIR@/chrony.conf\fR).
-.TP
-.B \-r
-This option will reload sample histories for each of the servers being used.
-These histories are created by using the \fIdump\fR command in \fIchronyc\fR,
-or by setting the \fIdumponexit\fR directive in the configuration file.  This
-option is useful if you want to stop and restart \fBchronyd\fR briefly for any
-reason, e.g. to install a new version.  However, it should be used only on
-systems where the kernel can maintain clock compensation whilst not under
-\fBchronyd\fR's control (i.e. Linux, FreeBSD, NetBSD and Solaris).
-.TP
-.B \-R
-When this option is used, the \fIinitstepslew\fR directive and the
-\fImakestep\fR directive used with a positive limit will be ignored. This
-option is useful when restarting \fBchronyd\fR and can be used in conjunction
-with the \fB-r\fR option.
-.TP
-.B \-s
-This option will set the system clock from the computer's real-time clock or
-to the last modification time of the file specified by the \fIdriftfile\fR
-directive.  Real-time clocks are supported only on Linux.
-
-If used in conjunction with the \fB-r\fR flag, \fBchronyd\fR will attempt
-to preserve the old samples after setting the system clock from
-the real time clock (RTC).  This can be used to allow \fBchronyd\fR to
-perform long term averaging of the gain or loss rate across system
-reboots, and is useful for dial-up systems that are shut down when
-not in use.  For this to work well, it relies on \fBchronyd\fR having
-been able to determine accurate statistics for the difference
-between the RTC and system clock last time the computer was on.
-
-If the last modification time of the drift file is later than the current time
-and the RTC time, the system time will be set to it to restore the time when
-\fBchronyd\fR was previously stopped.  This is useful on computers that have no
-RTC or the RTC is broken (e.g. it has no battery).
-.TP
-\fB\-u\fR \fIuser\fR
-This option sets the name of the system user to which \fBchronyd\fR will switch
-after start in order to drop root privileges.  It overrides the \fBuser\fR
-directive (default \fB@DEFAULT_USER@\fR).  It may be set to a non-root user
-only when \fBchronyd\fR is compiled with support for Linux capabilities
-(libcap) or on NetBSD with the \fB/dev/clockctl\fR device.
-.TP
-\fB\-F\fR \fIlevel\fR
-This option configures a system call filter when \fBchronyd\fR is compiled with
-support for the Linux secure computing (seccomp) facility. In level 1 the
-process is killed when a forbidden system call is made, in level -1 the SYSSIG
-signal is thrown instead and in level 0 the filter is disabled (default 0).
-.TP
-.B \-q
-When run in this mode, chronyd will set the system clock once
-and exit.  It will not detach from the terminal.
-.TP
-.B \-Q
-This option is similar to \fB\-q\fR, but it will only print the offset and
-not correct the clock.
-.TP
-.B \-v
-This option displays \fBchronyd\fR's version number to the terminal and exits
-.TP
-.B \-4
-Resolve hostnames only to IPv4 addresses and create only IPv4 sockets.
-.TP
-.B \-6
-Resolve hostnames only to IPv6 addresses and create only IPv6 sockets.
-
-.SH FILES
-\fI@SYSCONFDIR@/chrony.conf\fR
-
-.SH BUGS
-To report bugs, please visit \fIhttp://chrony.tuxfamily.org/\fR
-
-.SH "SEE ALSO"
-\fBchronyd\fR is documented in detail in the documentation supplied with the
-distribution (\fIchrony.txt\fR and \fIchrony.texi\fR).
-
-.BR chronyc(1),
-.BR chrony.conf(5),
-.BR hwclock(8),
-.BR ntpd(8)
-
-.I http://chrony.tuxfamily.org/
-
-.SH AUTHOR
-Richard Curnow <rc@rc0.org.uk>
-
-This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
-of "The Missing Man Pages Project".  Please see
-\fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
-
-The complete chrony documentation is supplied in texinfo format.
-

clientlog.c

@@ -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
+typedef struct {
-   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 {
   IPAddr ip_addr;
-  unsigned long client_hits;
+  uint32_t last_ntp_hit;
-  unsigned long peer_hits;
+  uint32_t last_cmd_hit;
-  unsigned long cmd_hits_bad;
+  uint32_t ntp_hits;
-  unsigned long cmd_hits_normal;
+  uint32_t cmd_hits;
-  unsigned long cmd_hits_auth;
+  uint16_t ntp_drops;
-  time_t last_ntp_hit;
+  uint16_t cmd_drops;
-  time_t last_cmd_hit;
+  uint16_t ntp_tokens;
-} Node;
+  uint16_t cmd_tokens;
+  int8_t ntp_rate;
+  int8_t cmd_rate;
+  int8_t ntp_timeout_rate;
+  uint8_t flags;
+} Record;
 
-typedef struct _Subnet {
+/* Hash table of records, there is a fixed number of records per slot */
-  void *entry[TABLE_SIZE];
+static ARR_Instance records;
-} Subnet;
 
-/* ================================================== */
+#define SLOT_BITS 4
 
-/* Table for the IPv4 class A subnet */
+/* Number of records in one slot of the hash table */
-static Subnet top_subnet4;
+#define SLOT_SIZE (1U << SLOT_BITS)
-/* Table for IPv6 */
-static Subnet top_subnet6;
 
-/* Table containing pointers directly to all nodes that have been
+/* Minimum number of slots */
-   allocated. */
+#define MIN_SLOTS 1
-static Node **nodes = NULL;
 
-/* Number of nodes actually in the table. */
+/* Maximum number of slots, this is a hard limit */
-static int n_nodes = 0;
+#define MAX_SLOTS (1U << (24 - SLOT_BITS))
 
-/* Number of entries for which the table has been sized. */
+/* Number of slots in the hash table */
-static int max_nodes = 0;
+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
+/* Global statistics */
-   and no new nodes or subnets should be allocated */
+static uint32_t total_ntp_hits;
-static int alloc_limit_reached;
+static uint32_t total_cmd_hits;
-
+static uint32_t total_ntp_drops;
-static unsigned long alloc_limit;
+static uint32_t total_cmd_drops;
-static unsigned long alloced;
+static uint32_t total_record_drops;
 
 /* ================================================== */
 
-static void
+static int expand_hashtable(void);
-split_ip6(IPAddr *ip, uint32_t *dst)
-{
-  int i;
 
-  for (i = 0; i < 4; i++)
+/* ================================================== */
-    dst[i] = ip->addr.in6[i * 4 + 0] << 24 |
+
-             ip->addr.in6[i * 4 + 1] << 16 |
+static int
-             ip->addr.in6[i * 4 + 2] << 8 |
+compare_ts(uint32_t x, uint32_t y)
-             ip->addr.in6[i * 4 + 3];
+{
+  if (x == y)
+    return 0;
+  if (y == INVALID_TS)
+    return 1;
+  return (int32_t)(x - y) > 0 ? 1 : -1;
 }
 
 /* ================================================== */
 
-inline static uint32_t
+static Record *
-get_subnet(uint32_t *addr, unsigned int where)
+get_record(IPAddr *ip)
 {
-  int off;
+  unsigned int first, i;
+  time_t last_hit, oldest_hit = 0;
+  Record *record, *oldest_record;
 
-  off = where / 32;
+  if (ip->family != IPADDR_INET4 && ip->family != IPADDR_INET6)
-  where %= 32;
+    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
+      if (record->ip_addr.family == IPADDR_UNSPEC)
-clear_subnet(Subnet *subnet)
+        break;
-{
-  int i;
 
-  for (i=0; i<TABLE_SIZE; i++) {
+      last_hit = compare_ts(record->last_ntp_hit, record->last_cmd_hit) > 0 ?
-    subnet->entry[i] = NULL;
+                 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;
+  interval = CLAMP(MIN_LIMIT_INTERVAL, interval, MAX_LIMIT_INTERVAL);
-  node->peer_hits = 0;
+  burst = CLAMP(MIN_LIMIT_BURST, burst, MAX_LIMIT_BURST);
-  node->cmd_hits_auth = 0;
+
-  node->cmd_hits_normal = 0;
+  /* Find smallest shift with which the maximum number fits in 16 bits */
-  node->cmd_hits_bad = 0;
+  for (*token_shift = 0; *token_shift < interval + TS_FRAC; (*token_shift)++) {
-  node->last_ntp_hit = (time_t) 0;
+    if (burst << (TS_FRAC + interval - *token_shift) < 1U << 16)
-  node->last_cmd_hit = (time_t) 0;
+      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);
+  int interval, burst, leak_rate;
-  clear_subnet(&top_subnet6);
+
-  if (CNF_GetNoClientLog()) {
+  max_ntp_tokens = max_cmd_tokens = 0;
-    active = 0;
+  ntp_tokens_per_packet = cmd_tokens_per_packet = 0;
-  } else {
+  ntp_token_shift = cmd_token_shift = 0;
-    active = 1;
+  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;
+  if (CNF_GetCommandRateLimit(&interval, &burst, &leak_rate)) {
-  max_nodes = 0;
+    set_bucket_params(interval, burst, &max_cmd_tokens, &cmd_tokens_per_packet,
-  n_nodes = 0;
+                      &cmd_token_shift);
+    cmd_leak_rate = CLAMP(MIN_LEAK_RATE, leak_rate, MAX_LEAK_RATE);
+  }
 
-  alloced = 0;
+  active = !CNF_GetNoClientLog();
-  alloc_limit = CNF_GetClientLogLimit();
+  if (!active) {
-  alloc_limit_reached = 0;
+    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();
 }
 
 /* ================================================== */
@@ -174,208 +327,302 @@ CLG_Initialise(void)
 void
 CLG_Finalise(void)
 {
-  int i;
+  if (!active)
-  
-  for (i = 0; i < n_nodes; i++)
-    Free(nodes[i]);
-  Free(nodes);
-}
-
-/* ================================================== */
-
-static void check_alloc_limit() {
-  if (alloc_limit_reached)
     return;
 
-  if (alloced >= alloc_limit) {
+  ARR_DestroyInstance(records);
-    LOG(LOGS_WARN, LOGF_ClientLog, "Client log memory limit reached");
+}
-    alloc_limit_reached = 1;
+
-  }
+/* ================================================== */
+
+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);
+  uint32_t interval, now_ts, prev_hit, new_tokens;
-  clear_subnet((Subnet *) parent_subnet->entry[the_entry]);
+  int interval2;
-  alloced += sizeof (Subnet);
-  check_alloc_limit();
-}
 
-/* ================================================== */
+  now_ts = get_ts_from_timeval(now);
 
-static void
+  prev_hit = *last_hit;
-create_node(Subnet *parent_subnet, int the_entry)
+  *last_hit = now_ts;
-{
+  (*hits)++;
-  Node *new_node;
-  new_node = MallocNew(Node);
-  parent_subnet->entry[the_entry] = (void *) new_node;
-  clear_node(new_node);
 
-  alloced += sizeof (Node);
+  interval = now_ts - prev_hit;
 
-  if (n_nodes == max_nodes) {
+  if (prev_hit == INVALID_TS || (int32_t)interval < 0)
-    if (nodes) {
+    return;
-      assert(max_nodes > 0);
+
-      max_nodes *= 2;
+  new_tokens = (now_ts >> token_shift) - (prev_hit >> token_shift);
-      nodes = ReallocArray(Node *, max_nodes, nodes);
+  *tokens = MIN(*tokens + new_tokens, max_tokens);
-    } else {
+
-      assert(max_nodes == 0);
+  /* Convert the interval to scaled and rounded log2 */
-      max_nodes = 16;
+  if (interval) {
-      nodes = MallocArray(Node *, max_nodes);
+    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]) {
+    interval2 = -RATE_SCALE * (TS_FRAC + 1);
-      if (alloc_limit_reached)
-        return NULL;
-      create_node(subnet, this_subnet);
-    }
-    return subnet->entry[this_subnet];
   }
-}
 
-/* ================================================== */
+  /* Update the rate in a rough approximation of exponential moving average */
-
+  if (*rate == INVALID_RATE) {
-static Node *
+    *rate = -interval2;
-get_node(IPAddr *ip)
-{
-  uint32_t ip6[4];
-
-  switch (ip->family) {
-    case IPADDR_INET4:
-      return (Node *)find_subnet(&top_subnet4, &ip->addr.in4, 1, 0);
-    case IPADDR_INET6:
-      split_ip6(ip, ip6);
-      return (Node *)find_subnet(&top_subnet6, ip6, 4, 0);
-    default:
-      return NULL;
-  }
-}
-
-/* ================================================== */
-
-void
-CLG_LogNTPClientAccess (IPAddr *client, time_t now)
-{
-  Node *node;
-
-  if (active) {
-    node = get_node(client);
-    if (node == NULL)
-      return;
-
-    node->ip_addr = *client;
-    ++node->client_hits;
-    node->last_ntp_hit = now;
-  }
-}
-
-/* ================================================== */
-
-void
-CLG_LogNTPPeerAccess(IPAddr *client, time_t now)
-{
-  Node *node;
-
-  if (active) {
-    node = get_node(client);
-    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)
-{
-  Node *node;
-
-  if (active) {
-    node = get_node(client);
-    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;
   } else {
-
+    if (*rate < -interval2) {
-    if ((index < 0) || (index >= n_nodes)) {
+      (*rate)++;
-      return CLG_INDEXTOOLARGE;
+    } 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;
+static int
-    report->client_hits = node->client_hits;
+get_index(Record *record)
-    report->peer_hits = node->peer_hits;
+{
-    report->cmd_hits_auth = node->cmd_hits_auth;
+  return record - (Record *)ARR_GetElements(records);
-    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;
+/* ================================================== */
+
+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 int CLG_LogNTPAccess(IPAddr *client, struct timeval *now);
-extern void CLG_LogNTPPeerAccess(IPAddr *client, time_t now);
+extern int CLG_LogCommandAccess(IPAddr *client, struct timeval *now);
-
+extern int CLG_LimitNTPResponseRate(int index);
-/* When logging command packets, there are several subtypes */
+extern int CLG_LimitCommandResponseRate(int index);
-
-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);
 
 /* And some reporting functions, for use by chronyc. */
-/* TBD */
 
-typedef enum {
+extern int CLG_GetNumberOfIndices(void);
-  CLG_SUCCESS,                  /* All is well */
+extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timeval *now);
-  CLG_EMPTYSUBNET,              /* No hosts logged in requested subnet */
+extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
-  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);
 
 #endif /* GOT_CLIENTLOG_H */

cmdmon.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2015
+ * Copyright (C) Miroslav Lichvar  2009-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -130,6 +130,9 @@ static const char permissions[] = {
   PERMIT_OPEN, /* SMOOTHING */
   PERMIT_AUTH, /* SMOOTHTIME */
   PERMIT_AUTH, /* REFRESH */
+  PERMIT_AUTH, /* SERVER_STATS */
+  PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX2 */
+  PERMIT_AUTH, /* LOCAL2 */
 };
 
 /* ================================================== */
@@ -246,30 +249,51 @@ prepare_socket(int family, int port_number)
 
 /* ================================================== */
 
+static void
+do_size_checks(void)
+{
+  int i, request_length, padding_length, reply_length;
+  CMD_Request request;
+  CMD_Reply reply;
+
+  assert(offsetof(CMD_Request, data) == 20);
+  assert(offsetof(CMD_Reply, data) == 28);
+
+  for (i = 0; i < N_REQUEST_TYPES; i++) {
+    request.version = PROTO_VERSION_NUMBER;
+    request.command = htons(i);
+    request_length = PKL_CommandLength(&request);
+    padding_length = PKL_CommandPaddingLength(&request);
+    if (padding_length > MAX_PADDING_LENGTH || padding_length > request_length ||
+        request_length > sizeof (CMD_Request) ||
+        (request_length && request_length < offsetof(CMD_Request, data)))
+      assert(0);
+  }
+
+  for (i = 1; i < N_REPLY_TYPES; i++) {
+    reply.reply = htons(i);
+    reply.status = STT_SUCCESS;
+    reply.data.manual_list.n_samples = htonl(MAX_MANUAL_LIST_SAMPLES);
+    reply_length = PKL_ReplyLength(&reply);
+    if ((reply_length && reply_length < offsetof(CMD_Reply, data)) ||
+        reply_length > sizeof (CMD_Reply))
+      assert(0);
+  }
+}
+
+/* ================================================== */
+
 void
 CAM_Initialise(int family)
 {
-  int i, port_number;
+  int port_number;
 
   assert(!initialised);
-  initialised = 1;
-
   assert(sizeof (permissions) / sizeof (permissions[0]) == N_REQUEST_TYPES);
+  do_size_checks();
 
-  for (i = 0; i < N_REQUEST_TYPES; i++) {
+  initialised = 1;
-    CMD_Request r;
-    int command_length, padding_length;
-
-    r.version = PROTO_VERSION_NUMBER;
-    r.command = htons(i);
-    command_length = PKL_CommandLength(&r);
-    padding_length = PKL_CommandPaddingLength(&r);
-    assert(padding_length <= MAX_PADDING_LENGTH && padding_length <= command_length);
-    assert(command_length == 0 || command_length >= offsetof(CMD_Reply, data));
-  }
-
   sock_fdu = -1;
-
   port_number = CNF_GetCommandPort();
 
   if (port_number && (family == IPADDR_UNSPEC || family == IPADDR_INET4))
@@ -561,11 +585,10 @@ handle_settime(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_local(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  int on_off, stratum;
+  if (ntohl(rx_message->data.local.on_off)) {
-  on_off = ntohl(rx_message->data.local.on_off);
+    REF_EnableLocal(ntohl(rx_message->data.local.stratum),
-  if (on_off) {
+                    UTI_FloatNetworkToHost(rx_message->data.local.distance),
-    stratum = ntohl(rx_message->data.local.stratum);
+                    ntohl(rx_message->data.local.orphan));
-    REF_EnableLocal(stratum);
   } else {
     REF_DisableLocal();
   }
@@ -661,17 +684,11 @@ handle_source_data(CMD_Request *rx_message, CMD_Reply *tx_message)
         tx_message->data.source_data.mode    = htons(RPY_SD_MD_REF);
         break;
     }
-    switch (report.sel_option) {
+    tx_message->data.source_data.flags =
-      case RPT_NORMAL:
+                  htons((report.sel_options & SRC_SELECT_PREFER ? RPY_SD_FLAG_PREFER : 0) |
-        tx_message->data.source_data.flags = htons(0);
+                        (report.sel_options & SRC_SELECT_NOSELECT ? RPY_SD_FLAG_NOSELECT : 0) |
-        break;
+                        (report.sel_options & SRC_SELECT_TRUST ? RPY_SD_FLAG_TRUST : 0) |
-      case RPT_PREFER:
+                        (report.sel_options & SRC_SELECT_REQUIRE ? RPY_SD_FLAG_REQUIRE : 0));
-        tx_message->data.source_data.flags = htons(RPY_SD_FLAG_PREFER);
-        break;
-      case RPT_NOSELECT:
-        tx_message->data.source_data.flags = htons(RPY_SD_FLAG_NOSELECT);
-        break;
-    }
     tx_message->data.source_data.reachability = htons(report.reachability);
     tx_message->data.source_data.since_sample = htonl(report.latest_meas_ago);
     tx_message->data.source_data.orig_latest_meas = UTI_FloatHostToNetwork(report.orig_latest_meas);
@@ -764,8 +781,11 @@ handle_add_source(NTP_Source_Type type, CMD_Request *rx_message, CMD_Reply *tx_m
   params.online  = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_ONLINE ? 1 : 0;
   params.auto_offline = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_AUTOOFFLINE ? 1 : 0;
   params.iburst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_IBURST ? 1 : 0;
-  params.sel_option = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_PREFER ? SRC_SelectPrefer :
+  params.sel_options =
-                      ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NOSELECT ? SRC_SelectNoselect : SRC_SelectNormal;
+    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_PREFER ? SRC_SELECT_PREFER : 0) |
+    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NOSELECT ? SRC_SELECT_NOSELECT : 0) |
+    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
+    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
   params.max_delay = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay);
   params.max_delay_ratio = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay_ratio);
 
@@ -1017,50 +1037,50 @@ handle_cyclelogs(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_client_accesses_by_index(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  CLG_Status result;
   RPT_ClientAccessByIndex_Report report;
-  unsigned long first_index, n_indices, n_indices_in_table;
+  RPY_ClientAccesses_Client *client;
-  int i, j;
+  int n_indices;
+  uint32_t i, j, req_first_index, req_n_clients;
   struct timeval now;
 
   SCH_GetLastEventTime(&now, NULL, NULL);
 
-  first_index = ntohl(rx_message->data.client_accesses_by_index.first_index);
+  req_first_index = ntohl(rx_message->data.client_accesses_by_index.first_index);
-  n_indices = ntohl(rx_message->data.client_accesses_by_index.n_indices);
+  req_n_clients = ntohl(rx_message->data.client_accesses_by_index.n_clients);
-  if (n_indices > MAX_CLIENT_ACCESSES)
+  if (req_n_clients > MAX_CLIENT_ACCESSES)
-    n_indices = MAX_CLIENT_ACCESSES;
+    req_n_clients = MAX_CLIENT_ACCESSES;
 
-  tx_message->reply = htons(RPY_CLIENT_ACCESSES_BY_INDEX);
+  n_indices = CLG_GetNumberOfIndices();
-
+  if (n_indices < 0) {
-  for (i = 0, j = 0; i < n_indices; i++) {
+    tx_message->status = htons(STT_INACTIVE);
-    result = CLG_GetClientAccessReportByIndex(first_index + i, &report,
+    return;
-                                              now.tv_sec, &n_indices_in_table);
-    tx_message->data.client_accesses_by_index.n_indices = htonl(n_indices_in_table);
-
-    switch (result) {
-      case CLG_SUCCESS:
-        UTI_IPHostToNetwork(&report.ip_addr, &tx_message->data.client_accesses_by_index.clients[j].ip);
-        tx_message->data.client_accesses_by_index.clients[j].client_hits = htonl(report.client_hits);
-        tx_message->data.client_accesses_by_index.clients[j].peer_hits = htonl(report.peer_hits);
-        tx_message->data.client_accesses_by_index.clients[j].cmd_hits_auth = htonl(report.cmd_hits_auth);
-        tx_message->data.client_accesses_by_index.clients[j].cmd_hits_normal = htonl(report.cmd_hits_normal);
-        tx_message->data.client_accesses_by_index.clients[j].cmd_hits_bad = htonl(report.cmd_hits_bad);
-        tx_message->data.client_accesses_by_index.clients[j].last_ntp_hit_ago = htonl(report.last_ntp_hit_ago);
-        tx_message->data.client_accesses_by_index.clients[j].last_cmd_hit_ago = htonl(report.last_cmd_hit_ago);
-        j++;
-        break;
-      case CLG_INDEXTOOLARGE:
-        break; /* ignore this index */
-      case CLG_INACTIVE:
-        tx_message->status = htons(STT_INACTIVE);
-        return;
-      default:
-        assert(0);
-        break;
-    }
   }
 
-  tx_message->data.client_accesses_by_index.next_index = htonl(first_index + i);
+  tx_message->reply = htons(RPY_CLIENT_ACCESSES_BY_INDEX2);
+  tx_message->data.client_accesses_by_index.n_indices = htonl(n_indices);
+
+  memset(tx_message->data.client_accesses_by_index.clients, 0,
+         sizeof (tx_message->data.client_accesses_by_index.clients));
+
+  for (i = req_first_index, j = 0; i < (uint32_t)n_indices && j < req_n_clients; i++) {
+    if (!CLG_GetClientAccessReportByIndex(i, &report, &now))
+      continue;
+
+    client = &tx_message->data.client_accesses_by_index.clients[j++];
+
+    UTI_IPHostToNetwork(&report.ip_addr, &client->ip);
+    client->ntp_hits = htonl(report.ntp_hits);
+    client->cmd_hits = htonl(report.cmd_hits);
+    client->ntp_drops = htonl(report.ntp_drops);
+    client->cmd_drops = htonl(report.cmd_drops);
+    client->ntp_interval = report.ntp_interval;
+    client->cmd_interval = report.cmd_interval;
+    client->ntp_timeout_interval = report.ntp_timeout_interval;
+    client->last_ntp_hit_ago = htonl(report.last_ntp_hit_ago);
+    client->last_cmd_hit_ago = htonl(report.last_cmd_hit_ago);
+  }
+
+  tx_message->data.client_accesses_by_index.next_index = htonl(i);
   tx_message->data.client_accesses_by_index.n_clients = htonl(j);
 }
 
@@ -1149,36 +1169,43 @@ handle_refresh(CMD_Request *rx_message, CMD_Reply *tx_message)
   NSR_RefreshAddresses();
 }
 
+/* ================================================== */
+
+static void
+handle_server_stats(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  RPT_ServerStatsReport report;
+
+  CLG_GetServerStatsReport(&report);
+  tx_message->reply = htons(RPY_SERVER_STATS);
+  tx_message->data.server_stats.ntp_hits = htonl(report.ntp_hits);
+  tx_message->data.server_stats.cmd_hits = htonl(report.cmd_hits);
+  tx_message->data.server_stats.ntp_drops = htonl(report.ntp_drops);
+  tx_message->data.server_stats.cmd_drops = htonl(report.cmd_drops);
+  tx_message->data.server_stats.log_drops = htonl(report.log_drops);
+}
+
 /* ================================================== */
 /* Read a packet and process it */
 
 static void
 read_from_cmd_socket(void *anything)
 {
-  int status;
-  int read_length; /* Length of packet read */
-  int expected_length; /* Expected length of packet without auth data */
-  unsigned long flags;
   CMD_Request rx_message;
   CMD_Reply tx_message;
-  int rx_message_length;
+  int status, read_length, expected_length, rx_message_length;
-  int sock_fd;
+  int localhost, allowed, sock_fd, log_index;
   union sockaddr_all where_from;
   socklen_t from_length;
   IPAddr remote_ip;
-  unsigned short remote_port;
+  unsigned short remote_port, rx_command;
-  int localhost;
+  struct timeval now, cooked_now;
-  int allowed;
-  unsigned short rx_command;
-  struct timeval now;
-  struct timeval cooked_now;
 
-  flags = 0;
   rx_message_length = sizeof(rx_message);
   from_length = sizeof(where_from);
 
   sock_fd = (long)anything;
-  status = recvfrom(sock_fd, (char *)&rx_message, rx_message_length, flags,
+  status = recvfrom(sock_fd, (char *)&rx_message, rx_message_length, 0,
                     &where_from.sa, &from_length);
 
   if (status < 0) {
@@ -1235,25 +1262,19 @@ read_from_cmd_socket(void *anything)
     return;
   }
 
-  /* Message size sanity check */
+  if (read_length < offsetof(CMD_Request, data) ||
-  if (read_length >= offsetof(CMD_Request, data)) {
-    expected_length = PKL_CommandLength(&rx_message);
-  } else {
-    expected_length = 0;
-  }
-
-  if (expected_length < offsetof(CMD_Request, data) ||
       read_length < offsetof(CMD_Reply, data) ||
       rx_message.pkt_type != PKT_TYPE_CMD_REQUEST ||
       rx_message.res1 != 0 ||
       rx_message.res2 != 0) {
 
-    /* We don't know how to process anything like this */
+    /* We don't know how to process anything like this or an error reply
-    CLG_LogCommandAccess(&remote_ip, CLG_CMD_BAD_PKT, cooked_now.tv_sec);
+       would be larger than the request */
-    
+    DEBUG_LOG(LOGF_CmdMon, "Command packet dropped");
     return;
   }
 
+  expected_length = PKL_CommandLength(&rx_message);
   rx_command = ntohs(rx_message.command);
 
   tx_message.version = PROTO_VERSION_NUMBER;
@@ -1271,10 +1292,8 @@ read_from_cmd_socket(void *anything)
   tx_message.pad5 = 0;
 
   if (rx_message.version != PROTO_VERSION_NUMBER) {
-    DEBUG_LOG(LOGF_CmdMon, "Read command packet with protocol version %d (expected %d) from %s",
+    DEBUG_LOG(LOGF_CmdMon, "Command packet has invalid version (%d != %d)",
-              rx_message.version, PROTO_VERSION_NUMBER, UTI_SockaddrToString(&where_from.sa));
+              rx_message.version, PROTO_VERSION_NUMBER);
-
-    CLG_LogCommandAccess(&remote_ip, CLG_CMD_BAD_PKT, cooked_now.tv_sec);
 
     if (rx_message.version >= PROTO_VERSION_MISMATCH_COMPAT_SERVER) {
       tx_message.status = htons(STT_BADPKTVERSION);
@@ -1283,11 +1302,9 @@ read_from_cmd_socket(void *anything)
     return;
   }
 
-  if (rx_command >= N_REQUEST_TYPES) {
+  if (rx_command >= N_REQUEST_TYPES ||
-    DEBUG_LOG(LOGF_CmdMon, "Read command packet with invalid command %d from %s",
+      expected_length < (int)offsetof(CMD_Request, data)) {
-              rx_command, UTI_SockaddrToString(&where_from.sa));
+    DEBUG_LOG(LOGF_CmdMon, "Command packet has invalid command %d", rx_command);
-
-    CLG_LogCommandAccess(&remote_ip, CLG_CMD_BAD_PKT, cooked_now.tv_sec);
 
     tx_message.status = htons(STT_INVALID);
     transmit_reply(&tx_message, &where_from);
@@ -1295,10 +1312,8 @@ read_from_cmd_socket(void *anything)
   }
 
   if (read_length < expected_length) {
-    DEBUG_LOG(LOGF_CmdMon, "Read incorrectly sized command packet from %s",
+    DEBUG_LOG(LOGF_CmdMon, "Command packet is too short (%d < %d)", read_length,
-              UTI_SockaddrToString(&where_from.sa));
+              expected_length);
-
-    CLG_LogCommandAccess(&remote_ip, CLG_CMD_BAD_PKT, cooked_now.tv_sec);
 
     tx_message.status = htons(STT_BADPKTLENGTH);
     transmit_reply(&tx_message, &where_from);
@@ -1307,7 +1322,14 @@ read_from_cmd_socket(void *anything)
 
   /* OK, we have a valid message.  Now dispatch on message type and process it. */
 
-  CLG_LogCommandAccess(&remote_ip, CLG_CMD_NORMAL, cooked_now.tv_sec);
+  log_index = CLG_LogCommandAccess(&remote_ip, &cooked_now);
+
+  /* Don't reply to all requests from hosts other than localhost if the rate
+     is excessive */
+  if (!localhost && log_index >= 0 && CLG_LimitCommandResponseRate(log_index)) {
+      DEBUG_LOG(LOGF_CmdMon, "Command packet discarded to limit response rate");
+      return;
+  }
 
   if (rx_command >= N_REQUEST_TYPES) {
     /* This should be already handled */
@@ -1395,7 +1417,7 @@ read_from_cmd_socket(void *anything)
           handle_settime(&rx_message, &tx_message);
           break;
         
-        case REQ_LOCAL:
+        case REQ_LOCAL2:
           handle_local(&rx_message, &tx_message);
           break;
 
@@ -1507,7 +1529,7 @@ read_from_cmd_socket(void *anything)
           handle_cyclelogs(&rx_message, &tx_message);
           break;
 
-        case REQ_CLIENT_ACCESSES_BY_INDEX:
+        case REQ_CLIENT_ACCESSES_BY_INDEX2:
           handle_client_accesses_by_index(&rx_message, &tx_message);
           break;
 
@@ -1547,8 +1569,13 @@ read_from_cmd_socket(void *anything)
           handle_refresh(&rx_message, &tx_message);
           break;
 
+        case REQ_SERVER_STATS:
+          handle_server_stats(&rx_message, &tx_message);
+          break;
+
         default:
-          assert(0);
+          DEBUG_LOG(LOGF_CmdMon, "Unhandled command %d", rx_command);
+          tx_message.status = htons(STT_FAILED);
           break;
       }
     } else {

cmdparse.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2013-2014
+ * Copyright (C) Miroslav Lichvar  2013-2014, 2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -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;
   
@@ -165,10 +165,16 @@ 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) {
@@ -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  2009-2015
+ * Copyright (C) Miroslav Lichvar  2009-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -50,15 +50,12 @@ static int parse_int(char *line, int *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 *);
@@ -68,11 +65,11 @@ 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_ratelimit(char *line, int *enabled, int *interval,
-static void parse_pool(char *);
+                            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 *);
 
 /* ================================================== */
@@ -88,6 +85,7 @@ static char *rtc_file = NULL;
 static double max_update_skew = 1000.0;
 static double correction_time_ratio = 3.0;
 static double max_clock_error = 1.0; /* in ppm */
+static double max_drift = 500000.0; /* in ppm */
 static double max_slew_rate = 1e6 / 12.0; /* in ppm */
 
 static double max_distance = 3.0;
@@ -110,6 +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 */
@@ -149,10 +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
+/* Threshold for a time adjustment to be logged to syslog */
-   exceeding the threshold is initiated */
+static double log_change_threshold = 1.0;
-static int do_log_change = 0;
-static double log_change_threshold = 0.0;
 
 static char *mail_user_on_change = NULL;
 static double mail_change_threshold = 0.0;
@@ -187,6 +185,16 @@ static char *bind_cmd_path;
  * 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 */
@@ -414,7 +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")) {
@@ -426,17 +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, "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")) {
@@ -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")) {
@@ -481,6 +492,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_double(p, &max_clock_error);
   } else if (!strcasecmp(command, "maxdistance")) {
     parse_double(p, &max_distance);
+  } else if (!strcasecmp(command, "maxdrift")) {
+    parse_double(p, &max_drift);
   } else if (!strcasecmp(command, "maxsamples")) {
     parse_int(p, &max_samples);
   } else if (!strcasecmp(command, "maxslewrate")) {
@@ -494,13 +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")) {
@@ -518,7 +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")) {
@@ -609,25 +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
+  while (*line) {
-parse_peer(char *line)
+    opt = line;
-{
+    line = CPS_SplitWord(line);
-  parse_source(line, NTP_PEER, 0);
+    if (sscanf(line, "%d%n", &val, &n) != 1) {
-}
+      command_parse_error();
-
+      return;
-/* ================================================== */
+    }
-
+    line += n;
-static void
+    if (!strcasecmp(opt, "interval"))
-parse_pool(char *line)
+      *interval = val;
-{
+    else if (!strcasecmp(opt, "burst"))
-  parse_source(line, NTP_SERVER, 1);
+      *burst = val;
+    else if (!strcasecmp(opt, "leak"))
+      *leak = val;
+    else
+      command_parse_error();
+  }
 }
 
 /* ================================================== */
@@ -635,12 +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;
@@ -649,13 +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();
@@ -676,17 +696,17 @@ parse_refclock(char *line)
   line = CPS_SplitWord(line);
   param = Strdup(p);
 
-  while (*line) {
+  for (cmd = line; *cmd; line += n, cmd = line) {
-    cmd = line;
     line = CPS_SplitWord(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;
@@ -722,18 +742,24 @@ 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) {
+  if (*cmd) {
-    other_parse_error("Invalid/unreadable refclock parameter");
+    command_parse_error();
     return;
   }
 
@@ -746,11 +772,11 @@ 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;
 }
@@ -792,13 +818,9 @@ parse_log(char *line)
 static void
 parse_local(char *line)
 {
-  int stratum;
+  if (!CPS_ParseLocal(line, &local_stratum, &local_orphan, &local_distance))
-  if (sscanf(line, "stratum%d", &stratum) == 1) {
-    local_stratum = stratum;
-    enable_local = 1;
-  } else {
     command_parse_error();
-  }
+  enable_local = 1;
 }
 
 /* ================================================== */
@@ -861,11 +883,6 @@ 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;
-  }
 }
 
 /* ================================================== */
@@ -1027,41 +1044,6 @@ 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
@@ -1504,6 +1486,14 @@ CNF_GetMaxUpdateSkew(void)
 
 /* ================================================== */
 
+double
+CNF_GetMaxDrift(void)
+{
+  return max_drift;
+}
+
+/* ================================================== */
+
 double
 CNF_GetMaxClockError(void)
 {
@@ -1576,10 +1566,12 @@ 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;
@@ -1623,11 +1615,10 @@ CNF_GetMaxChange(int *delay, int *ignore, double *offset)
 
 /* ================================================== */
 
-void
+double
-CNF_GetLogChange(int *enabled, double *threshold)
+CNF_GetLogChange(void)
 {
-  *enabled = do_log_change;
+  return log_change_threshold;
-  *threshold = log_change_threshold;
 }
 
 /* ================================================== */
@@ -1789,6 +1780,26 @@ 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, int *leap_only)
 {

conf.h

@@ -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);
@@ -83,6 +83,7 @@ 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);
 
@@ -91,13 +92,15 @@ 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 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);
 

configure

@@ -111,7 +111,6 @@ 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]
@@ -202,6 +201,7 @@ try_libcap=-1
 try_clockctl=0
 feat_scfilter=0
 try_seccomp=-1
+priv_ops=""
 readline_lib=""
 readline_inc=""
 ncurses_lib=""
@@ -260,9 +260,6 @@ do
     --datarootdir=* )
       SETDATAROOTDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
-    --infodir=* )
-      SETINFODIR=`echo $option | sed -e 's/^.*=//;'`
-    ;;
     --mandir=* )
       SETMANDIR=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -375,10 +372,13 @@ case $OPERATINGSYSTEM in
         add_def LINUX
         echo "Configuring for " $SYSTEM
     ;;
-
     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
         echo "Configuring for $SYSTEM"
     ;;
     NetBSD)
@@ -392,6 +392,10 @@ case $OPERATINGSYSTEM in
         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)
@@ -403,6 +407,10 @@ case $OPERATINGSYSTEM in
         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" $VERSION ")" 
     ;;                                                                        
     * )
@@ -479,7 +487,7 @@ then
     split_days=0
   else
     split_seconds=`date '+%s'`
-    if [ "x$split_seconds" = "" ]; then
+    if [ "x$split_seconds" = "x" ]; then
       echo "error: could not get current time, --with-ntp-era option is needed"
       exit 1
     fi
@@ -567,6 +575,10 @@ then
   MYCFLAGS="$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
@@ -605,6 +617,7 @@ 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" ] && \
@@ -612,9 +625,21 @@ if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
     'seccomp_init(SCMP_ACT_KILL);'
 then
   add_def FEAT_SCFILTER
+  # NAME2IPADDRESS shouldn't be enabled with other operations as the helper
+  # process works on one request at the time and the async resolver could
+  # block the main thread
+  priv_ops="NAME2IPADDRESS"
   EXTRA_LIBS="$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" ] && [ $try_rtc = "1" ] && \
   test_code '<linux/rtc.h>' 'sys/ioctl.h linux/rtc.h' '' '' \
     'ioctl(1, RTC_UIE_ON&RTC_UIE_OFF&RTC_RD_TIME&RTC_SET_TIME, 0&RTC_UF);'
@@ -768,11 +793,6 @@ if [ "x$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
@@ -819,7 +839,7 @@ fi
 
 add_def CHRONY_VERSION "\"${CHRONY_VERSION}\""
 
-for f in Makefile chrony.conf.5 chrony.texi chronyc.1 chronyd.8
+for f in Makefile doc/Makefile test/unit/Makefile
 do
   echo Creating $f
   sed -e "s%@EXTRA_OBJECTS@%${EXTRA_OBJECTS}%;\
@@ -838,7 +858,6 @@ do
           s%@SBINDIR@%${SBINDIR}%;\
           s%@DOCDIR@%${DOCDIR}%;\
           s%@MANDIR@%${MANDIR}%;\
-          s%@INFODIR@%${INFODIR}%;\
           s%@LOCALSTATEDIR@%${LOCALSTATEDIR}%;\
           s%@CHRONYSOCKDIR@%${CHRONYSOCKDIR}%;\
           s%@CHRONYVARDIR@%${CHRONYVARDIR}%;\

contrib/bryan_christianson_1/chronylogrotate.sh

@@ -1,20 +1,27 @@
 #!/bin/sh
 
-#  chronylogrotate.sh
+#  chronyd/chronyc - Programs for keeping computer clocks accurate.
-#  ChronyControl
-#
-#  Created by Bryan Christianson on 12/07/15.
 #
+#  **********************************************************************
+#  * 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
 
-if [ ! -e "$LOGDIR" ]; then
-  echo "missing directory: $LOGDIR"
-  exit 1
-fi
-
-cd $LOGDIR
-
 rotate () {
   prefix=$1
 
@@ -33,13 +40,19 @@ rotate () {
   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
-/usr/local/bin/chronyc -a -f /etc/chrony.d/chrony.conf cyclelogs > /dev/null
 
 exit $?

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

@@ -1,77 +1,71 @@
+// This file is part of chrony
+//
+// Copyright (C) Richard P. Curnow  1997-2003
+// Copyright (C) Miroslav Lichvar  2014-2016
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of version 2 of the GNU General Public License as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+= Frequently Asked Questions
 :toc:
 :numbered:
 
-Frequently Asked Questions
+== `chrony` compared to other programs
-==========================
 
-== +chrony+ compared to other programs
+=== How does `chrony` compare to `ntpd`?
 
-=== How does +chrony+ compare to +ntpd+?
+`chronyd` was designed to work well in a wide range of conditions and it can
-
+usually synchronise the system clock faster and with better time accuracy. It
-+chronyd+ was designed to work well in a wide range of conditions and it can
-usually synchronise the system clock faster and with better time accuracy.  It
 doesn't implement some of the less useful NTP modes like broadcast client or
 multicast server/client.
 
-For a more detailed comparison of features and performance, see the
+If your computer is connected to the Internet only for few minutes at a time,
-http://chrony.tuxfamily.org/comparison.html[comparison page] on the +chrony+
-website and the
-http://chrony.tuxfamily.org/manual.html#Comparison-with-ntpd[Comparison with
-ntpd] section in the manual.
-
-If your computer is connected to the internet only for few minutes at a time,
 the network connection is often congested, you turn your computer off or
 suspend it frequently, the clock is not very stable (e.g. there are rapid
 changes in the temperature or it's a virtual machine), or you want to use NTP
-on an isolated network with no hardware reference clocks in sight, +chrony+
+on an isolated network with no hardware reference clocks in sight, `chrony`
 will probably work much better for you.
 
-The original reason +chrony+ was written was that +ntpd+ (called +xntpd+ at the
+For a more detailed comparison of features and performance, see the
-time) could not to do anything sensible on a PC which was connected to the 'net
+https://chrony.tuxfamily.org/comparison.html[comparison page] on the `chrony`
-only for about 5 minutes once or twice a day, mainly to upload/download email
+website.
-and news.  The requirements were
-
-* slew the time to correct it when going online and NTP servers
-  become visible
-* determine the rate at which the computer gains or loses time and
-  use this information to keep it reasonably correct between connects
-  to the 'net.  This has to be done using a method that does not care
-  about the intermittent availability of the references or the fact
-  the computer is turned off between groups of measurements.
-* maintain the time across reboots, by working out the error and
-  drift rate of the computer's real-time clock and using this
-  information to set the system clock correctly at boot up.
-
-Also, when working with isolated networks with no true time references at all
-+ntpd+ was found to give no help with managing the local clock's gain/loss rate
-on the NTP master node (which was set from watch).  Some automated support was
-added to +chrony+ to deal with this.
 
 == 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+
+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
+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
+reliability the client should have at least three servers. The `iburst` option
 speeds up the initial synchronisation.
 
 To stabilize the initial synchronisation on the next start, the estimated drift
-of the system clock is saved by adding the +driftfile+ directive.
+of the system clock is saved to a file specified by the `driftfile` directive.
 
 If the system clock can be far from the true time after boot for any reason,
-+chronyd+ should be allowed to correct it quickly by stepping instead of
+`chronyd` should be allowed to correct it quickly by stepping instead of
-slewing, which would take a very long time.  The +makestep+ directive does
+slewing, which would take a very long time. The `makestep` directive does
 that.
 
-In order to keep the real-time clock (RTC) close to the true time on Linux, so
+In order to keep the real-time clock (RTC) close to the true time, so the
-the system time is reasonably close to the true time when it's initialized on
+system time is reasonably close to the true time when it's initialized on the
-the next boot from the RTC, the +rtcsync+ directive enables a kernel mode in
+next boot from the RTC, the `rtcsync` directive enables a mode in which the
-which the system time is copied to the RTC every 11 minutes.
+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
+http://www.pool.ntp.org/[pool.ntp.org] project, the minimal _chrony.conf_ file
 could be:
 
 ----
@@ -83,15 +77,15 @@ rtcsync
 
 === How do I make an NTP server from an NTP client?
 
-You need to add an +allow+ directive to the 'chrony.conf' file in order to open
+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
+the NTP port and allow `chronyd` to reply to client requests. `allow` with no
 specified subnet allows all IPv4 and IPv6 addresses.
 
 === I have several computers on a LAN. Should be all clients of an external server?
 
-The best configuration is usually to make one computer the master, with
+The best configuration is usually to make one computer the server, with
-the others as clients of it.  Add a +local+ directive to the master's
+the others as clients of it. Add a `local` directive to the server's
-'chrony.conf' file.  This configuration will be better because
+_chrony.conf_ file. This configuration will be better because
 
 * the load on the external connection is less
 * the load on the external NTP server(s) is less
@@ -100,76 +94,79 @@ the others as clients of it.  Add a +local+ directive to the master's
 
 === Must I specify servers by IP address if DNS is not available on chronyd start?
 
-No.  Starting from version 1.25, +chronyd+ will keep trying to resolve
+No. Starting from version 1.25, `chronyd` will keep trying to resolve
-the hostnames specified in the +server+ and +peer+ directives in
+the names specified by the `server`, `pool`, and `peer` directives in an
-increasing intervals until it succeeds.  The +online+ command can be
+increasing interval until it succeeds. The `online` command can be issued from
-issued from +chronyc+ to try to resolve them immediately.
+`chronyc` to try to resolve them immediately.
 
-=== How can I make +chronyd+ more secure?
+=== How can I make `chronyd` more secure?
 
-If you don't need to serve time to NTP clients or peers, you can add +port 0+
+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
+to the _chrony.conf_ file to completely disable the NTP server functionality
-and prevent NTP requests from reaching +chronyd+. Starting from version 2.0,
+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+
+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
+directive or command, an NTP peer is configured, or the `broadcast` directive
 is used.
 
-If you don't need to use +chronyc+ remotely, you can add the following
+If you don't need to use `chronyc` remotely, you can add the following
 directives to the configuration file to bind the command sockets to the
-loopback interface.  This is done by default since version 2.0.
+loopback interface. This is done by default since version 2.0.
 
 ----
 bindcmdaddress 127.0.0.1
 bindcmdaddress ::1
 ----
 
-If you don't need to use +chronyc+ at all or you need to run +chronyc+ only
+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
+under the root or _chrony_ user (which can access `chronyd` through a Unix
-socket since version 2.2), you can disable the internet command sockets
+domain socket since version 2.2), you can disable the internet command sockets
-completely by adding +cmdport 0+ to the configuration file.
+completely by adding `cmdport 0` to the configuration file.
 
-On Linux, if +chronyd+ is compiled with support for Linux capabilities
+You can specify an unprivileged user with the `-u` option, or the `user`
-(available in the libcap library), or on NetBSD with the +/dev/clockctl+
+directive in the _chrony.conf_ file, to which `chronyd` will switch after start
-device, you can specify an unprivileged user with the +-u+ option or +user+
+in order to drop root privileges. The configure script has a `--with-user`
-directive in the 'chrony.conf' file to drop root privileges after start.  The
+option, which sets the default user. On Linux, `chronyd` needs to be compiled
-configure option +--with-user+ can be used to drop the privileges by default.
+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
+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.
+(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 compromised.  The filter
+kernel exploits from the `chronyd` process if it's compromised. It's
-shouldn't be enabled without testing that it allows all system calls needed
+recommended to enable the filter only when it's known to work on the version of
-with the specific configuration and libraries that +chronyd+ is using (e.g.
+the system where `chrony` is installed as the filter needs to allow also system
-libc and its NSS configuration).  If +chronyd+ is getting killed, some system
+calls made from libraries that `chronyd` is using (e.g. libc) and different
-call is missing and the filter has to be disabled until it's patched to allow
+versions or implementations of the libraries may make different system calls.
-that call.
+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
+network. It's better to use more than one server, three or four is usually
-recommended as the minimum, so +chronyd+ can detect falsetickers and combine
+recommended as the minimum, so `chronyd` can detect servers that serve false
-measurements from multiple sources.
+time and combine measurements from multiple sources.
 
-There are also useful options which can be set in the +server+ directive, they
+There are also useful options which can be set in the `server` directive, they
-are +minpoll+, +maxpoll+, +polltarget+, +maxdelay+, +maxdelayratio+ and
+are `minpoll`, `maxpoll`, `polltarget`, `maxdelay`, `maxdelayratio` and
-+maxdelaydevratio+.
+`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
+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
+default values are 6 (64 seconds) for `minpoll`, 10 (1024 seconds) for
-+maxpoll+ and 6 (samples) for +polltarget+.  The default values should be used
+`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
+for general servers on the Internet. With your own NTP servers or if have
 permission to poll some servers more frequently, setting these options for
 shorter polling intervals may significantly improve the accuracy of the system
 clock.
 
-The optimal polling interval depends on many factors, including the ratio
+The optimal polling interval depends mainly on two factors, stability of the
-between the wander of the clock and the network jitter (sometimes expressed in
+network latency and stability of the system clock (which mainly depends on the
-NTP documents as the Allan intercept), the temperature sensitivity of the
+temperature sensitivity of the crystal oscillator and the maximum rate of the
-crystal oscillator and the maximum rate of change of the temperature.
+temperature change).
 
-An example of the directive for an NTP server on the internet that you are
+An example of the directive for an NTP server on the Internet that you are
 allowed to poll frequently could be
 
 ----
@@ -185,96 +182,126 @@ server ntp.local minpoll 2 maxpoll 4 polltarget 30
 
 The maxdelay options are useful to ignore measurements with larger delay (e.g.
 due to congestion in the network) and improve the stability of the
-synchronisation.  The +maxdelaydevratio+ option could be added to the example
+synchronisation. The `maxdelaydevratio` option could be added to the example
 with local NTP server
 
 ----
 server ntp.local minpoll 2 maxpoll 4 polltarget 30 maxdelaydevratio 2
 ----
 
-=== What happened to the +commandkey+ and +generatecommandkey+ directives?
+=== What happened to the `commandkey` and `generatecommandkey` directives?
 
-They were removed in version 2.2.  Authentication is no longer supported in the
+They were removed in version 2.2. Authentication is no longer supported in the
-command protocol.  Commands that required authentication are now allowed only
+command protocol. Commands that required authentication are now allowed only
-through a Unix domain socket, which is accessible only by the root and chrony
+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
+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
+password, please consider using ssh and/or sudo to run `chronyc` under the root
-or chrony user on the same host as +chronyd+ is running.
+or _chrony_ user on the host where `chronyd` is running.
 
 == Computer is not synchronising
 
-This is the most common problem.  There are a number of reasons, see the
+This is the most common problem. There are a number of reasons, see the
 following questions.
 
 === Behind a firewall?
 
-If there is a firewall between you and the NTP server you're trying to use, the
+Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it's
-packets may be blocked.  Try using a tool like +wireshark+ or +tcpdump+ to see if
+zero, it means `chronyd` did not get any valid responses from the NTP server
-you're getting responses from the server.  If you have an external modem, see
+you are trying to use. If there is a firewall between you and the server, the
-if the receive light blinks straight after the transmit light (when the link is
+packets may be blocked. Try using a tool like `wireshark` or `tcpdump` to see
-quiet apart from the NTP traffic.)  Try adding +log measurements+ to the
+if you're getting any responses from the server.
-'chrony.conf' file and look in the 'measurements.log' file after +chronyd+ has
-been running for a short period. See if any measurements appear.
 
-=== Are NTP servers specified with the +offline+ option?
+When `chronyd` is receiving responses from the servers, the output of the
+`sources` command issued few minutes after `chronyd` start might look like
+this:
 
-Check that you're using +chronyc+\'s +online+ and +offline+ commands
+----
-appropriately.  Again, check in 'measurements.log' to see if you're getting any
+210 Number of sources = 3
+MS Name/IP address         Stratum Poll Reach LastRx Last sample
+===============================================================================
+^* foo.example.net               2   6   377    34   +484us[ -157us] +/-   30ms
+^- bar.example.net               2   6   377    34    +33ms[  +32ms] +/-   47ms
+^+ baz.example.net               3   6   377    35  -1397us[-2033us] +/-   60ms
+----
+
+=== Are NTP servers specified with the `offline` option?
+
+Check that you're using ``chronyc``'s `online` and `offline` commands
+appropriately. Again, check in _measurements.log_ to see if you're getting any
 data back from the server.
 
-=== Is +chronyd+ allowed to step the system clock?
+=== Is `chronyd` allowed to step the system clock?
 
-By default, +chronyd+ adjusts the clock gradually by slowing it down or
+By default, `chronyd` adjusts the clock gradually by slowing it down or
-speeding it up.  If the clock is too far from the correct time, it will take
+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
+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
+``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
+The `makestep` directive can be used to allow `chronyd` to step the clock. For
-example, if 'chrony.conf' had
+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
+than one second. Normally, it's recommended to allow the step only in the first
-first few updates, but in some cases (e.g. a computer without RTC or virtual
+few updates, but in some cases (e.g. a computer without an RTC or virtual
-machine which can be suspended and resumed with incorrect time) it may be
+machine which can be suspended and resumed with an incorrect time) it may be
-necessary to allow the step at any clock update.  The example above would
+necessary to allow the step on any clock update. The example above would change
-change to
+to
 
 ----
 makestep 1 -1
 ----
 
-== Issues with +chronyc+
+== Issues with `chronyc`
 
-=== I keep getting the error +506 Cannot talk to daemon+
+=== I keep getting the error `506 Cannot talk to daemon`
 
-When accessing +chronyd+ remotely, make sure that the 'chrony.conf' file (on
+When accessing `chronyd` remotely, make sure that the _chrony.conf_ file (on
-the computer where +chronyd+ is running) has a 'cmdallow' entry for the
+the computer where `chronyd` is running) has a `cmdallow` entry for the
-computer you are running +chronyc+ on and an appropriate 'bindcmdaddress'
+computer you are running `chronyc` on and an appropriate `bindcmdaddress`
-directive.  This isn't necessary for localhost.
+directive. This isn't necessary for localhost.
 
-Perhaps +chronyd+ is not running.  Try using the +ps+ command (e.g.  on Linux,
+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
+`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
+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).
+problem with the way you are trying to start it (e.g. at boot time).
 
 Perhaps you have a firewall set up in a way that blocks packets on port
-323/udp.  You need to amend the firewall configuration in this case.
+323/udp. You need to amend the firewall configuration in this case.
 
-=== I keep getting the error +501 Not authorised+
+=== I keep getting the error `501 Not authorised`
 
-Since version 2.2, the +password+ command doesn't do anything and +chronyc+
+Since version 2.2, the `password` command doesn't do anything and `chronyc`
-needs to run under the root or chrony user, which are allowed to access the
+needs to run locally under the root or _chrony_ user, which are allowed to
-Unix domain command socket.
+access the ``chronyd``'s Unix domain command socket.
 
-=== Is the +chronyc+ / +chronyd+ protocol documented anywhere?
+With older versions, you need to authenticate with the `password` command first
+or use the `-a` option to authenticate automatically on start. The
+configuration file needs to specify a file which contains keys (`keyfile`
+directive) and which key in the key file should be used for `chronyc`
+authentication (`commandkey` directive).
 
-Only by the source code :-) See 'cmdmon.c' (+chronyd+ side) and 'client.c'
+=== Why does `chronyc tracking` always print an IPv4 address as reference ID?
-(+chronyc+ side).
+
+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
 
@@ -284,96 +311,94 @@ 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
+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
+`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 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
+the RTC. If the computer is not turned off for a long time, the RTC should
 still be close to the true time when the system clock will be initialized from
 it on the next boot.
 
-The other option is to use the +rtcfile+ directive, which will tell +chronyd+
+The other option is to use the `rtcfile` directive, which tells `chronyd` to
-to monitor the rate at which the RTC gains or loses time.  When +chronyd+ is
+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
+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
+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
+`rtcautotrim` directive can be used to keep the RTC close to the true time, but
 it's not strictly necessary if its only purpose is to set the system clock when
-+chronyd+ is started on boot.  See the documentation for details.
+`chronyd` is started on boot. See the documentation for details.
 
-=== I want to use +chronyd+'s RTC support. Must I disable +hwclock+?
+=== I want to use ``chronyd``'s RTC support. Must I disable `hwclock`?
 
-The +hwclock+ program is often set-up by default in the boot and shutdown
+The `hwclock` program is often set-up by default in the boot and shutdown
-scripts with many Linux installations.  With the kernel RTC synchronisation
+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
+(`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
+system clock is synchronised. If you want to use ``chronyd``'s RTC monitoring
-(+rtcfile+ directive), it's important to disable +hwclock+ in the shutdown
+(`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
+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
+to `chronyd`. At the next reboot, `chronyd` started with the `-s` option will
 compensate this (wrong) time with its estimate of how far the RTC has drifted
 whilst the power was off, giving a meaningless initial system time.
 
-There is no need to remove +hwclock+ from the boot process, as long as +chronyd+
+There is no need to remove `hwclock` from the boot process, as long as `chronyd`
 is started after it has run.
 
-=== I just keep getting the +513 RTC driver not running+ message
+=== I just keep getting the `513 RTC driver not running` message
 
-For the real time clock support to work, you need the following three
+For the real-time clock support to work, you need the following three
 things
 
-* a kernel that is supported (e.g. 2.2 onwards)
+* an RTC in your computer
-* enhanced RTC support compiled into the kernel
+* a Linux kernel with enabled RTC support
-* an +rtcfile+ directive in your 'chrony.conf' file
+* an `rtcfile` directive in your _chrony.conf_ file
 
-== NTP-specific issues
+=== I get `Could not open /dev/rtc, Device or resource busy` in my syslog file
-
-=== Can +chronyd+ be driven from broadcast NTP servers?
-
-No, the broadcast client mode is not supported and there is currently no plan
-to implement it.  The broadcast and multicast modes are inherently less
-accurate and less secure (even with authentication) than the ordinary
-server/client mode and they are not as useful as they used to be.  Even with
-very modest hardware a single NTP server can serve time to hundreds of
-thousands of clients using the ordinary mode.
-
-=== Can +chronyd+ transmit broadcast NTP packets?
-
-Yes, the +broadcast+ directive can be used to enable the broadcast server mode
-to serve time to clients in the network which support the broadcast client mode
-(it's not supported in +chronyd+, see the previous question).
-
-=== Can +chronyd+ keep the system clock a fixed offset away from real time?
-
-This is not possible as the program currently stands.
-
-=== What happens if the network connection is dropped without using +chronyc+'s +offline+ command first?
-
-+chronyd+ will keep trying to access the server(s) that it thinks are online.
-When the network is connected again, it will take some time (on average half of
-the current polling interval) before new measurements are made and the clock is
-corrected. If the servers were set to offline and the +online+ command was
-issued when the network was connected, +chronyd+ would make new measurements
-immediately.
-
-The +auto_offline+ option to the +server+ entry in the 'chrony.conf' file may
-be useful to switch the servers to the offline state automatically.
-
-== Linux-specific issues
-
-=== I get +Could not open /dev/rtc, Device or resource busy+ in my syslog file
 
 Some other program running on the system may be using the device.
 
-== Microsoft Windows
+== NTP-specific issues
 
-=== Does +chrony+ support Windows?
+=== Can `chronyd` be driven from broadcast NTP servers?
 
-No.  The +chronyc+ program (the command-line client used for configuring
+No, the broadcast client mode is not supported and there is currently no plan
-+chronyd+ while it is running) has been successfully built and run under
+to implement it. The broadcast and multicast modes are inherently less
-Cygwin in the past.  +chronyd+ is not portable, because part of it is
+accurate and less secure (even with authentication) than the ordinary
-very system-dependent.  It needs adapting to work with Windows'
+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
+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.conf.example2

@@ -21,12 +21,6 @@ rtcsync
 # Specify file containing keys for NTP authentication.
 #keyfile /etc/chrony.keys
 
-# Disable logging of client accesses.
-noclientlog
-
-# Send message to syslog when clock adjustment is larger than 0.5 seconds.
-logchange 0.5
-
 # 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
@@ -207,6 +191,13 @@ driftfile /var/lib/chrony/drift
 
 ! 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
@@ -233,6 +224,7 @@ driftfile /var/lib/chrony/drift
 
 # 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 ::
 
@@ -248,6 +240,11 @@ driftfile /var/lib/chrony/drift
 # syntax and meaning is the same as for 'allow' and 'deny', except that
 # 'cmdallow' and 'cmddeny' control access to the chronyd's command port.
 
+# Rate limiting can be enabled also for command packets.  (Note,
+# commands from localhost are never limited.)
+
+! cmdratelimit interval 1 burst 16
+
 #######################################################################
 ### REAL TIME CLOCK
 # chronyd can characterise the system's real-time clock.  This is the

examples/chrony.keys.example

@@ -1,15 +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.
+# chronyd is configured to switch to after start.
 #
-# Don't use the example keys!  The keys need to be random for maximum security.
+# Don't use the example keys!  It's recommended to generate random keys using
-# These shell commands can be used to generate random MD5 and SHA1 keys on
+# the chronyc keygen command.
-# systems which have the /dev/urandom device:
-# echo "1 MD5 HEX:$(tr -d -c '[:xdigit:]' < /dev/urandom | head -c 32)"
-# echo "1 SHA1 HEX:$(tr -d -c '[:xdigit:]' < /dev/urandom | head -c 40)"
 
 # Examples of valid keys:
 
-#1 ALongAndRandomPassword
+#1 MD5 AVeryLongAndRandomPassword
-#2 MD5 HEX:B028F91EA5C38D06C2E140B26C7F41EC
+#2 MD5 HEX:12114855C7931009B4049EF3EFC48A139C3F989F
-#3 SHA1 HEX:1DC764E0791B11FA67EFC7ECBC4B0D73F68A070C
+#3 SHA1 HEX:B2159C05D6A219673A3B7E896B6DE07F6A440995

examples/chrony.spec

@@ -10,7 +10,6 @@ Source: chrony-%{version}%{?prerelease:-%{prerelease}}.tar.gz
 License: GPLv2
 Group: Applications/Utilities
 BuildRoot: %{_tmppath}/%{name}-%{version}-root-%(id -u -n)
-Requires: info
 
 %description
 chrony is a client and server for the Network Time Protocol (NTP).
@@ -28,29 +27,20 @@ manual input as time references.
 	--prefix=%{_prefix} \
 	--bindir=%{_bindir} \
 	--sbindir=%{_sbindir} \
-	--infodir=%{_infodir} \
 	--mandir=%{_mandir}
 make
-make chrony.txt
-make chrony.info
 
 %install
 rm -rf $RPM_BUILD_ROOT
 make install DESTDIR=$RPM_BUILD_ROOT
-rm -rf $RPM_BUILD_ROOT%{_docdir}
-mkdir -p $RPM_BUILD_ROOT%{_infodir}
-cp chrony.info* $RPM_BUILD_ROOT%{_infodir}
 
 %files
 %{_sbindir}/chronyd
 %{_bindir}/chronyc
-%{_infodir}/chrony.info*
 %{_mandir}/man1/chronyc.1.gz
 %{_mandir}/man5/chrony.conf.5.gz
 %{_mandir}/man8/chronyd.8.gz
-%doc README
+%doc README FAQ NEWS COPYING
-%doc chrony.txt
-%doc COPYING
 %doc examples/chrony.conf.example*
 %doc examples/chrony.keys.example
 

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;
@@ -290,6 +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

@@ -37,6 +37,7 @@ extern void KEY_Reload(void);
 extern int KEY_GetKey(uint32_t key_id, char **key, int *len);
 extern int KEY_KeyKnown(uint32_t key_id);
 extern int KEY_GetAuthDelay(uint32_t key_id);
+extern int KEY_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

@@ -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);
 }
 
 /* ================================================== */

logging.h

@@ -100,6 +100,7 @@ typedef enum {
   LOGF_Keys,
   LOGF_Logging,
   LOGF_Nameserv,
+  LOGF_PrivOps,
   LOGF_Rtc,
   LOGF_Regress,
   LOGF_Sys,
@@ -108,7 +109,6 @@ typedef enum {
   LOGF_SysMacOSX,
   LOGF_SysNetBSD,
   LOGF_SysSolaris,
-  LOGF_SysSunOS,
   LOGF_SysTimex,
   LOGF_SysWinnt,
   LOGF_TempComp,

main.c

@@ -49,6 +49,7 @@
 #include "refclock.h"
 #include "clientlog.h"
 #include "nameserv.h"
+#include "privops.h"
 #include "smooth.h"
 #include "tempcomp.h"
 #include "util.h"
@@ -68,6 +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)
 {
@@ -107,6 +120,7 @@ MAI_CleanupAndExit(void)
   SYS_Finalise();
   SCH_Finalise();
   LCL_Finalise();
+  PRV_Finalise();
 
   delete_pidfile();
   
@@ -351,6 +365,8 @@ int main
   int system_log = 1;
   int config_args = 0;
 
+  do_platform_checks();
+
   LOG_Initialise();
 
   /* Parse command line options */
@@ -463,6 +479,7 @@ int main
    * be done *AFTER* the daemon-creation fork() */
   write_lockfile();
 
+  PRV_Initialise();
   LCL_Initialise();
   SCH_Initialise();
   SYS_Initialise();

make_release

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

nameserv.c

@@ -50,6 +50,8 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
   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++)
     ;
 

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_MIN_MAC_LENGTH (4 + 16)
-#define NTP_MAX_MAC_LENGTH MAX_HASH_LENGTH
+#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)

ntp_core.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2015
+ * Copyright (C) Miroslav Lichvar  2009-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -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
+  SCH_TimeoutID rx_timeout_id;  /* Timeout ID for latest received response */
-                                   pending to transmit to the source */
+  SCH_TimeoutID tx_timeout_id;  /* Timeout ID for next transmission */
-  SCH_TimeoutID timeout_id;     /* Scheduler's timeout ID, if we are
-                                   running on a timer. */
   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(&tv1, &ntv1, NULL);
-  UTI_TimevalToInt64(&tv2, &ntv2, 0);
+  UTI_TimevalToInt64(&tv2, &ntv2, NULL);
   UTI_Int64ToTimeval(&ntv1, &tv1);
   UTI_Int64ToTimeval(&ntv2, &tv2);
 
@@ -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 */
+  /* Stop both rx and tx timers if running */
-  if (inst->timer_running)
+  SCH_RemoveTimeout(inst->rx_timeout_id);
-    SCH_RemoveTimeout(inst->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,
+  inst->tx_timeout_id = SCH_AddTimeoutInClass(delay, SAMPLING_SEPARATION,
-                                           SAMPLING_RANDOMNESS,
+                                              SAMPLING_RANDOMNESS,
-                                           SCH_NtpSamplingClass,
+                                              SCH_NtpSamplingClass,
-                                           transmit_timeout, (void *)inst);
+                                              transmit_timeout, (void *)inst);
-  inst->timer_running = 1;
 }
 
 /* ================================================== */
@@ -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);
+  SCH_RemoveTimeout(inst->tx_timeout_id);
-    inst->timer_running = 0;
+  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,
+      LOG(LOGS_WARN, LOGF_NtpCore, "Key %"PRIu32" used by source %s is %s",
-          UTI_IPToString(&result->remote_addr.ip_addr), result->auth_key_id);
+          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->rx_timeout_id = 0;
-  result->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;
 
@@ -777,28 +817,38 @@ 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.
+  smooth_time = 0;
-     A more accurate time stamp will be taken later in this function. */
+  smooth_offset = 0.0;
-  SCH_GetLastEventTime(&local_transmit, NULL, NULL);
 
-  REF_GetReferenceParams(&local_transmit,
+  if (my_mode == MODE_CLIENT) {
-                         &are_we_synchronised, &leap_status,
+    /* Don't reveal local time or state of the clock in client packets */
-                         &our_stratum,
+    precision = 32;
-                         &our_ref_id, &our_ref_time,
+    leap_status = our_stratum = our_ref_id = 0;
-                         &our_root_delay, &our_root_dispersion);
+    our_ref_time.tv_sec = our_ref_time.tv_usec = 0;
-
+    our_root_delay = our_root_dispersion = 0.0;
-  /* 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;
   } else {
-    smooth_time = 0;
+    /* This is accurate enough and cheaper than calling LCL_ReadCookedTime.
-    smooth_offset = 0.0;
+       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 (smooth_time) {
@@ -809,14 +859,8 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     local_receive = *local_rx;
   }
 
-  if (are_we_synchronised) {
-    leap = (int) leap_status;
-  } else {
-    leap = LEAP_Unsynchronised;
-  }
-
   /* 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;
@@ -825,7 +869,7 @@ 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 */
@@ -836,19 +880,22 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
 
   /* Now fill in timestamps */
 
-  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
@@ -866,7 +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),
@@ -886,7 +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);
@@ -909,9 +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:
@@ -944,6 +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
@@ -957,7 +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;
 
@@ -975,7 +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;
 
@@ -1008,8 +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);
+}
 
 /* ================================================== */
 
@@ -1126,7 +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;
 
@@ -1165,7 +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. */
@@ -1183,7 +1239,6 @@ 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
@@ -1204,10 +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
+     defined maximum. */
-     the last synchronisation update. */
+  test7 = pkt_root_delay / 2.0 + pkt_root_dispersion < NTP_MAX_DISPERSION;
-  test7 = pkt_root_delay / 2.0 + pkt_root_dispersion < NTP_MAX_DISPERSION &&
-          UTI_CompareTimevals(&remote_reference_tv, &remote_transmit_tv) < 1;
 
   /* The packet is considered valid if the tests above passed */
   valid_packet = test1 && test2 && test3 && test5 && test6 && test7;
@@ -1273,9 +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
+    /* Test A requires that the peer delay is not larger than the configured
-       administrator-defined value */ 
+       maximum and in client mode also that the server processing time is sane */
-    testA = delay <= inst->max_delay;
+    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
@@ -1294,7 +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;
@@ -1328,24 +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;
@@ -1370,8 +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 ?
+                           MAX(message->stratum, inst->min_stratum),
-                             message->stratum : inst->min_stratum,
                            (NTP_Leap) pkt_leap);
 
       SRC_SelectSource(inst->source);
@@ -1410,6 +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;
   }
 
@@ -1423,7 +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);
   }
 
@@ -1483,7 +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;
@@ -1491,7 +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) {
@@ -1499,7 +1537,6 @@ NCR_ProcessKnown
       switch (inst->mode) {
         case MODE_ACTIVE:
           /* Ordinary symmetric peering */
-          log_peer_access = 1;
           proc_packet = 1;
           break;
         case MODE_PASSIVE:
@@ -1522,7 +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:
@@ -1576,9 +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) {
@@ -1622,7 +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 */
@@ -1648,12 +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 */
@@ -1661,6 +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);
 
@@ -1968,6 +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

@@ -37,6 +37,7 @@
 #include "local.h"
 #include "logging.h"
 #include "conf.h"
+#include "privops.h"
 #include "util.h"
 
 #define INVALID_SOCK_FD -1
@@ -161,21 +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
@@ -184,7 +185,7 @@ 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
 
@@ -192,7 +193,7 @@ prepare_socket(int family, int port_number, int client_only)
 #ifdef HAVE_IN_PKTINFO
     /* We want the local IP info on server sockets */
     if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IP_PKTINFO");
       /* Don't quit - we might survive anyway */
     }
 #endif
@@ -202,18 +203,18 @@ prepare_socket(int family, int port_number, int client_only)
 #ifdef IPV6_V6ONLY
     /* Receive IPv6 packets only */
     if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPV6_V6ONLY socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_V6ONLY");
     }
 #endif
 
 #ifdef HAVE_IN6_PKTINFO
 #ifdef IPV6_RECVPKTINFO
     if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_RECVPKTINFO");
     }
 #else
     if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
-      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set IPv6 packet info socket option");
+      LOG(LOGS_ERR, LOGF_NtpIO, "Could not set %s socket option", "IPV6_PKTINFO");
     }
 #endif
 #endif
@@ -221,7 +222,7 @@ prepare_socket(int family, int port_number, int client_only)
 #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",
         UTI_SockaddrFamilyToString(family), strerror(errno));
     close(sock_fd);
@@ -555,7 +556,7 @@ read_from_socket(void *anything)
 #endif
 
 #ifdef SO_TIMESTAMP
-      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP) {
+      if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMP) {
         struct timeval tv;
 
         memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));

ntp_sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014
+ * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -53,11 +53,11 @@ typedef struct {
   int pool;                     /* Number of the pool from which was this source
                                    added or INVALID_POOL */
   int tentative;                /* Flag indicating there was no valid response
-                                   yet and the source may be removed if other
+                                   received from the source yet */
-                                   sources from the pool respond first */
 } 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 */
@@ -70,6 +70,7 @@ static int auto_start_sources = 0;
 struct UnresolvedSource {
   char *name;
   int port;
+  int random_order;
   int replacement;
   union {
     struct {
@@ -202,26 +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) {
+  if (remote_addr->ip_addr.family != IPADDR_INET4 &&
-    case IPADDR_INET6:
+      remote_addr->ip_addr.family != IPADDR_INET6) {
-      ip6 = remote_addr->ip_addr.addr.in6;
+    *found = *slot = 0;
-      hash = (ip6[0] ^ ip6[4] ^ ip6[8] ^ ip6[12]) |
+    return;
-           (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;
   }
 
+  hash = UTI_IPToHash(&remote_addr->ip_addr);
   port = remote_addr->port;
 
   for (i = 0; i < size / 2; i++) {
@@ -243,12 +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;
 }
 
 /* ================================================== */
@@ -266,7 +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);
@@ -320,7 +311,7 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type, So
       record->remote_addr = NCR_GetRemoteAddress(record->data);
       record->name = name ? Strdup(name) : NULL;
       record->pool = pool;
-      record->tentative = pool != INVALID_POOL ? 1 : 0;
+      record->tentative = 1;
 
       if (auto_start_sources)
         NCR_StartInstance(record->data);
@@ -337,6 +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)
@@ -350,6 +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();
 
@@ -367,13 +368,17 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
 {
   NTP_Remote_Address address;
   int i, added;
+  unsigned short first = 0;
+
+  if (us->random_order)
+    UTI_GetRandomBytes(&first, sizeof (first));
 
   for (i = added = 0; i < n_addrs; i++) {
-    DEBUG_LOG(LOGF_NtpSources, "(%d) %s", i + 1, UTI_IPToString(&ip_addrs[i]));
+    address.ip_addr = ip_addrs[((unsigned int)i + first) % n_addrs];
-
-    address.ip_addr = ip_addrs[i];
     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;
@@ -516,6 +521,7 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, Source
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(name);
   us->port = port;
+  us->random_order = 0;
   us->replacement = 0;
   us->new_source.type = type;
   us->new_source.params = *params;
@@ -657,6 +663,11 @@ resolve_source_replacement(SourceRecord *record)
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(record->name);
   us->port = record->remote_addr->port;
+  /* If there never was a valid reply from this source (e.g. it was a bad
+     replacement), ignore the order of addresses from the resolver to not get
+     stuck to a pair of addresses if the order doesn't change, or a group of
+     IPv4/IPv6 addresses if the resolver prefers inaccessible IP family */
+  us->random_order = record->tentative;
   us->replacement = 1;
   us->replace_source = *record->remote_addr;
 
@@ -742,6 +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
@@ -761,20 +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);
+      if (record->pool != INVALID_POOL) {
-      pool = (struct SourcePool *)ARR_GetElement(pools, record->pool);
+        pool = ARR_GetElement(pools, record->pool);
-      pool->sources++;
+        pool->sources++;
 
-      DEBUG_LOG(LOGF_NtpSources, "pool %s has %d confirmed sources",
+        DEBUG_LOG(LOGF_NtpSources, "pool %s has %d confirmed sources",
-                record->name, pool->sources);
+                  record->name, pool->sources);
 
-      /* If the number of sources reached the configured maximum, remove
+        /* If the number of sources from the pool reached the configured
-         the tentative sources added from this pool */
+           maximum, remove the remaining tentative sources */
-      if (pool->sources >= pool->max_sources)
+        if (pool->sources >= pool->max_sources)
-        remove_tentative_pool_sources(record->pool);
+          remove_tentative_pool_sources(record->pool);
+      }
     }
   } else {
     NCR_ProcessUnknown(message, now, now_err, remote_addr, local_addr, length);

ntp_sources.h

@@ -83,6 +83,9 @@ 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
@@ -33,145 +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
+struct request_length {
-command_unpadded_length(CMD_Request *r)
+  uint16_t command;
-{
+  uint16_t padding;
-  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.null.EOR);
-      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.null.EOR);
-      case REQ_SOURCE_DATA :
-        return offsetof(CMD_Request, data.source_data.EOR);
-      case REQ_REKEY :
-        return offsetof(CMD_Request, data.null.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.null.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.null.EOR);
-      case REQ_SOURCESTATS :
-        return offsetof(CMD_Request, data.sourcestats.EOR);
-      case REQ_RTCREPORT :
-        return offsetof(CMD_Request, data.null.EOR);
-      case REQ_TRIMRTC :
-        return offsetof(CMD_Request, data.null.EOR);
-      case REQ_CYCLELOGS :
-        return offsetof(CMD_Request, data.null.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.null.EOR);
-      case REQ_MANUAL_DELETE:
-        return offsetof(CMD_Request, data.manual_delete.EOR);
-      case REQ_MAKESTEP:
-        return offsetof(CMD_Request, data.null.EOR);
-      case REQ_ACTIVITY:
-        return offsetof(CMD_Request, data.null.EOR);
-      case REQ_RESELECT:
-        return offsetof(CMD_Request, data.null.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);
-      case REQ_SMOOTHING:
-        return offsetof(CMD_Request, data.null.EOR);
-      case REQ_SMOOTHTIME:
-        return offsetof(CMD_Request, data.smoothtime.EOR);
-      case REQ_REFRESH:
-        return offsetof(CMD_Request, data.null.EOR);
-      default:
-        /* If we fall through the switch, it most likely means we've forgotten to implement a new case */
-        assert(0);
-    }
-  }
 
-  /* Catch-all case */
+static const struct request_length request_lengths[] = {
-  return 0;
+  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;
 
@@ -180,139 +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) {
+  return request_lengths[ntohs(r->command)].padding;
-    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.null.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.null.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.null.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.null.EOR, data.tracking.EOR);
-    case REQ_SOURCESTATS:
-      return PADDING_LENGTH(data.sourcestats.EOR, data.sourcestats.EOR);
-    case REQ_RTCREPORT:
-      return PADDING_LENGTH(data.null.EOR, data.rtc.EOR);
-    case REQ_TRIMRTC:
-      return PADDING_LENGTH(data.null.EOR, data.null.EOR);
-    case REQ_CYCLELOGS:
-      return PADDING_LENGTH(data.null.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.null.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.null.EOR, data.null.EOR);
-    case REQ_ACTIVITY:
-      return PADDING_LENGTH(data.null.EOR, data.activity.EOR);
-    case REQ_RESELECT:
-      return PADDING_LENGTH(data.null.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);
-    case REQ_SMOOTHING:
-      return PADDING_LENGTH(data.null.EOR, data.smoothing.EOR);
-    case REQ_SMOOTHTIME:
-      return PADDING_LENGTH(data.smoothtime.EOR, data.null.EOR);
-    case REQ_REFRESH:
-      return PADDING_LENGTH(data.null.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;
-  }
 }
 
 /* ================================================== */
@@ -320,65 +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) {
+  /* Length of MANUAL_LIST depends on number of samples stored in it */
-      case RPY_NULL:
+  if (type == RPY_MANUAL_LIST) {
-        return offsetof(CMD_Reply, data.null.EOR);
+    uint32_t ns;
-      case RPY_N_SOURCES:
+
-        return offsetof(CMD_Reply, data.n_sources.EOR);
+    if (r->status != htons(STT_SUCCESS))
-      case RPY_SOURCE_DATA:
+      return offsetof(CMD_Reply, data);
-        return offsetof(CMD_Reply, data.source_data.EOR);
+
-      case RPY_MANUAL_TIMESTAMP:
+    ns = ntohl(r->data.manual_list.n_samples);
-        return offsetof(CMD_Reply, data.manual_timestamp.EOR);
+    if (ns > MAX_MANUAL_LIST_SAMPLES)
-      case RPY_TRACKING:
+      return 0;
-        return offsetof(CMD_Reply, data.tracking.EOR);
+
-      case RPY_SOURCESTATS:
+    return offsetof(CMD_Reply, data.manual_list.samples) +
-        return offsetof(CMD_Reply, data.sourcestats.EOR);
+           ns * sizeof (RPY_ManualListSample);
-      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);
-      case RPY_SMOOTHING:
-        return offsetof(CMD_Reply, data.smoothing.EOR);
-      default:
-        assert(0);
-    }
   }
 
-  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

@@ -87,12 +87,12 @@ struct RCL_Instance_Record {
   SRC_Instance source;
 };
 
-/* Array of RCL_Instance_Record */
+/* Array of pointers to RCL_Instance_Record */
 static ARR_Instance refclocks;
 
 static LOG_FileID logfileid;
 
-static int valid_sample_time(RCL_Instance instance, struct timeval *tv);
+static int valid_sample_time(RCL_Instance instance, struct timeval *raw, struct timeval *cooked);
 static int pps_stratum(RCL_Instance instance, struct timeval *tv);
 static void poll_timeout(void *arg);
 static void slew_samples(struct timeval *raw, struct timeval *cooked, double dfreq,
@@ -106,6 +106,7 @@ static void filter_reset(struct MedianFilter *filter);
 static double filter_get_avg_sample_dispersion(struct MedianFilter *filter);
 static void filter_add_sample(struct MedianFilter *filter, struct timeval *sample_time, double offset, double dispersion);
 static int filter_get_last_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion);
+static int filter_get_samples(struct MedianFilter *filter);
 static int filter_select_samples(struct MedianFilter *filter);
 static int filter_get_sample(struct MedianFilter *filter, struct timeval *sample_time, double *offset, double *dispersion);
 static void filter_slew_samples(struct MedianFilter *filter, struct timeval *when, double dfreq, double doffset);
@@ -114,13 +115,13 @@ 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 +149,7 @@ RCL_Finalise(void)
     filter_fini(&inst->filter);
     Free(inst->driver_parameter);
     SRC_DestroyInstance(inst->source);
+    Free(inst);
   }
 
   if (ARR_GetSize(refclocks) > 0) {
@@ -162,8 +164,10 @@ 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 +237,7 @@ 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 +264,7 @@ 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",
@@ -369,11 +373,9 @@ RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset,
 
   /* Make sure the timestamp and offset provided by the driver are sane */
   if (!UTI_IsTimeOffsetSane(sample_time, offset) ||
-      !valid_sample_time(instance, sample_time))
+      !valid_sample_time(instance, sample_time, &cooked_time))
     return 0;
 
-  filter_add_sample(&instance->filter, &cooked_time, offset - correction + instance->offset, dispersion);
-
   switch (leap) {
     case LEAP_Normal:
     case LEAP_InsertSecond:
@@ -381,10 +383,11 @@ RCL_AddSample(RCL_Instance instance, struct timeval *sample_time, double offset,
       instance->leap_status = leap;
       break;
     default:
-      instance->leap_status = LEAP_Unsynchronised;
+      DEBUG_LOG(LOGF_Refclock, "refclock sample ignored bad leap %d", leap);
-      break;
+      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);
@@ -410,7 +413,7 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
   dispersion += instance->precision;
 
   if (!UTI_IsTimeOffsetSane(pulse_time, 0.0) ||
-      !valid_sample_time(instance, pulse_time))
+      !valid_sample_time(instance, pulse_time, &cooked_time))
     return 0;
 
   rate = instance->pps_rate;
@@ -471,15 +474,16 @@ 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;
@@ -500,18 +504,25 @@ RCL_AddPulse(RCL_Instance instance, struct timeval *pulse_time, double second)
 }
 
 static int
-valid_sample_time(RCL_Instance instance, struct timeval *tv)
+valid_sample_time(RCL_Instance instance, struct timeval *raw, struct timeval *cooked)
 {
-  struct timeval raw_time;
+  struct timeval raw_time, last_sample_time;
-  double diff;
+  double diff, last_offset, last_dispersion;
 
   LCL_ReadRawTime(&raw_time);
-  UTI_DiffTimevalsToDouble(&diff, &raw_time, tv);
+  UTI_DiffTimevalsToDouble(&diff, &raw_time, raw);
-  if (diff < 0.0 || diff > UTI_Log2ToDouble(instance->poll + 1)) {
+
-    DEBUG_LOG(LOGF_Refclock, "%s refclock sample not valid age=%.6f tv=%s",
+  if (diff < 0.0 || diff > UTI_Log2ToDouble(instance->poll + 1) ||
-        UTI_RefidToString(instance->ref_id), diff, UTI_TimevalToString(tv));
+      (filter_get_samples(&instance->filter) > 0 &&
+       filter_get_last_sample(&instance->filter, &last_sample_time,
+                              &last_offset, &last_dispersion) &&
+       UTI_CompareTimevals(&last_sample_time, cooked) >= 0)) {
+    DEBUG_LOG(LOGF_Refclock, "%s refclock sample not valid age=%.6f raw=%s cooked=%s",
+              UTI_RefidToString(instance->ref_id), diff,
+              UTI_TimevalToString(raw), UTI_TimevalToString(cooked));
     return 0;
   }
+
   return 1;
 }
 
@@ -529,9 +540,10 @@ 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 */ 
@@ -715,6 +727,12 @@ filter_get_last_sample(struct MedianFilter *filter, struct timeval *sample_time,
   return 1;
 }
 
+static int
+filter_get_samples(struct MedianFilter *filter)
+{
+  return filter->used;
+}
+
 static const struct FilterSample *tmp_sorted_array;
 
 static int

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  2009-2015
+ * Copyright (C) Miroslav Lichvar  2009-2016
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -45,6 +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 */
+/* Threshold for logging clock changes to syslog */
-static int do_log_change;
 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 */
@@ -232,9 +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 */
@@ -255,8 +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);
 
@@ -264,7 +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;
@@ -273,11 +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();
 }
@@ -428,10 +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);
-    SCH_RemoveTimeout(fb_drift_timeout_id);
+  fb_drift_timeout_id = 0;
-    fb_drift_timeout_id = -1;
-  }
 
   if (update_interval < 1.0 || update_interval > last_ref_update_interval * 4.0)
     return;
@@ -464,7 +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);
@@ -481,7 +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);
@@ -539,8 +532,7 @@ maybe_log_offset(double offset, time_t now)
 
   abs_offset = fabs(offset);
 
-  if (do_log_change &&
+  if (abs_offset > log_change_threshold) {
-      (abs_offset > log_change_threshold)) {
     LOG(LOGS_WARN, LOGF_Reference,
         "System clock wrong by %.6f seconds, adjustment started",
         -offset);
@@ -686,7 +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;
 
@@ -738,11 +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);
-    SCH_RemoveTimeout(leap_timeout_id);
+  leap_timeout_id = 0;
-    leap_timer_running = 0;
+  leap_in_progress = 0;
-    leap_in_progress = 0;
-  }
 
   if (!our_leap_sec)
     return;
@@ -760,7 +750,6 @@ set_leap_timeout(time_t now)
   }
 
   leap_timeout_id = SCH_AddTimeout(&when, leap_start_timeout, NULL);
-  leap_timer_running = 1;
 }
 
 /* ================================================== */
@@ -1170,29 +1159,37 @@ REF_GetReferenceParams
  double *root_dispersion
 )
 {
-  double elapsed;
+  double elapsed, dispersion;
-  double extra_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 = NTP_REFID_LOCAL;
@@ -1233,13 +1230,27 @@ REF_GetReferenceParams
 int
 REF_GetOurStratum(void)
 {
-  if (are_we_synchronised) {
+  struct timeval now_cooked, ref_time;
-    return our_stratum;
+  int synchronised, stratum;
-  } else if (enable_local_stratum) {
+  NTP_Leap leap_status;
-    return local_stratum;
+  uint32_t ref_id;
-  } else {
+  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;
 }
 
 /* ================================================== */
@@ -1270,10 +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;
 }
 
 /* ================================================== */
@@ -1286,14 +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)
@@ -1322,52 +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 = NTP_REFID_UNSYNC;
+  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) {
+  if (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;
     rep->ip_addr = our_ref_ip;
-    rep->stratum = our_stratum;
-    rep->ref_time = our_ref_time;
     rep->resid_freq_ppm = 1.0e6 * our_residual_freq;
     rep->skew_ppm = 1.0e6 * our_skew;
-    rep->root_delay = our_root_delay;
-    rep->root_dispersion = our_root_dispersion + extra_dispersion;
-
-  } else if (enable_local_stratum) {
-
-    rep->ref_id = NTP_REFID_LOCAL;
-    rep->ip_addr.family = IPADDR_UNSPEC;
-    rep->stratum = local_stratum;
-    rep->ref_time = now_cooked;
-    rep->root_dispersion = LCL_GetSysPrecisionAsQuantum();
   }
-
 }

reference.h

@@ -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;
+  int stratum;
-  unsigned long leap_status;
+  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;
+  uint32_t ntp_hits;
-  unsigned long peer_hits;
+  uint32_t cmd_hits;
-  unsigned long cmd_hits_auth;
+  uint16_t ntp_drops;
-  unsigned long cmd_hits_normal;
+  uint16_t cmd_drops;
-  unsigned long cmd_hits_bad;
+  int8_t ntp_interval;
-  unsigned long last_ntp_hit_ago;
+  int8_t cmd_interval;
-  unsigned long last_cmd_hit_ago;
+  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;

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 = 0;
-static SCH_TimeoutID timeout_id;
 
 static int skip_interrupts;
 
@@ -581,10 +580,8 @@ RTC_Linux_Initialise(void)
 void
 RTC_Linux_Finalise(void)
 {
-  if (timeout_running) {
+  SCH_RemoveTimeout(timeout_id);
-    SCH_RemoveTimeout(timeout_id);
+  timeout_id = 0;
-    timeout_running = 0;
-  }
 
   /* Remove input file handler */
   if (fd >= 0) {
@@ -630,7 +627,7 @@ switch_interrupts(int onoff)
 static void
 measurement_timeout(void *any)
 {
-  timeout_running = 0;
+  timeout_id = 0;
   switch_interrupts(1);
 }
 
@@ -894,7 +891,6 @@ turn_off_interrupt:
 
         switch_interrupts(0);
     
-        timeout_running = 1;
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
 
@@ -907,7 +903,6 @@ turn_off_interrupt:
 
         switch_interrupts(0);
     
-        timeout_running = 1;
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
       
@@ -916,7 +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;
@@ -936,9 +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);
-
 }
 
 /* ================================================== */
@@ -946,7 +939,6 @@ RTC_Linux_TimeInit(void (*after_hook)(void *), void *anything)
 void
 RTC_Linux_StartMeasurements(void)
 {
-  timeout_running = 0;
   measurement_timeout(NULL);
 }
 
@@ -1126,10 +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);
-      SCH_RemoveTimeout(timeout_id);
+    timeout_id = 0;
-      timeout_running = 0;
-    }
     switch_interrupts(1);
   }
 

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;
@@ -356,7 +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;
   }
@@ -397,7 +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);
@@ -421,6 +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) {
@@ -436,9 +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);
 }
 
 /* ================================================== */
@@ -690,7 +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

@@ -137,7 +137,7 @@ get_smoothing(struct timeval *now, double *poffset, double *pfreq,
 static void
 update_stages(void)
 {
-  double s1, s2, s, l1, l2, l3, lc, f, f2;
+  double s1, s2, s, l1, l2, l3, lc, f, f2, l1t[2], l3t[2], err[2];
   int i, dir;
 
   /* Prepare the three stages so that the integral of the frequency offset
@@ -146,22 +146,41 @@ update_stages(void)
   s1 = smooth_offset / max_wander;
   s2 = smooth_freq * smooth_freq / (2.0 * max_wander * max_wander);
   
-  l1 = l2 = l3 = 0.0;
-
   /* Calculate the lengths of the 1st and 3rd stage assuming there is no
-     frequency limit.  If length of the 1st stage comes out negative, switch
+     frequency limit.  The direction of the 1st stage is selected so that
-     its direction. */
+     the lengths will not be negative.  With extremely small offsets both
-  for (dir = -1; dir <= 1; dir += 2) {
+     directions may give a negative length due to numerical errors, so select
+     the one which gives a smaller error. */
+
+  for (i = 0, dir = -1; i <= 1; i++, dir += 2) {
+    err[i] = 0.0;
     s = dir * s1 + s2;
-    if (s >= 0.0) {
+
-      l3 = sqrt(s);
+    if (s < 0.0) {
-      l1 = l3 - dir * smooth_freq / max_wander;
+      err[i] += -s;
-      if (l1 >= 0.0)
+      s = 0.0;
-        break;
+    }
+
+    l3t[i] = sqrt(s);
+    l1t[i] = l3t[i] - dir * smooth_freq / max_wander;
+
+    if (l1t[i] < 0.0) {
+      err[i] += l1t[i] * l1t[i];
+      l1t[i] = 0.0;
     }
   }
 
-  assert(dir <= 1 && l1 >= 0.0 && l3 >= 0.0);
+  if (err[0] < err[1]) {
+    l1 = l1t[0];
+    l3 = l3t[0];
+    dir = -1;
+  } else {
+    l1 = l1t[1];
+    l3 = l3t[1];
+    dir = 1;
+  }
+
+  l2 = 0.0;
 
   /* If the limit was reached, shorten 1st+3rd stages and set a 2nd stage */
   f = dir * smooth_freq + l1 * max_wander - max_freq;

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
@@ -73,6 +73,8 @@ typedef enum {
   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_UNTRUSTED,        /* Overlaps trusted sources */
   SRC_FALSETICKER,      /* Doesn't agree with others */
   SRC_JITTERY,          /* Scatter worse than other's dispersion (not used) */
   SRC_WAITS_SOURCES,    /* Not enough sources, selection postponed */
@@ -118,7 +120,7 @@ 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;
@@ -209,7 +211,7 @@ 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;
 
@@ -241,7 +243,7 @@ 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);
@@ -414,7 +416,7 @@ 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++;
@@ -429,9 +431,11 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
     REF_SetUnsynchronised();
   }
 
-  /* Try to replace NTP sources that are unreachable or falsetickers */
+  /* Try to replace NTP sources that are unreachable, falsetickers, or
-  if (inst->type == SRC_NTP && (inst->status == SRC_FALSETICKER ||
+     have root distance larger than the allowed maximum */
-      (!inst->reachability && inst->reachability_size == SOURCE_REACH_BITS))) {
+  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);
   }
 }
@@ -602,8 +606,10 @@ 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 n_badstats_sources, max_sel_reach, max_badstat_reach, sel_req_source;
-  int depth, best_depth, combined, stratum, min_stratum, max_score_index;
+  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;
@@ -630,14 +636,20 @@ 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;
     }
@@ -671,6 +683,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
       max_sel_reach = sources[i]->reachability;
   }
 
+  orphan_stratum = REF_GetOrphanStratum();
+  orphan_source = INVALID_SOURCE;
+
   for (i = 0; i < n_sources; i++) {
     if (sources[i]->status != SRC_OK)
       continue;
@@ -685,7 +700,56 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
     }
 
+    /* When the local reference is configured with the orphan option, NTP
+       sources that have stratum equal to the configured local stratum are
+       considered to be orphans (i.e. serving local time while not being
+       synchronised with real time) and are excluded from the normal source
+       selection.  Sources with stratum larger than the local stratum are
+       considered to be directly on indirectly synchronised to an orphan and
+       are always ignored.
+
+       If no selectable source is available and all orphan sources have
+       reference IDs larger than the local ID, no source will be selected and
+       the local reference mode will be activated at some point, i.e. this host
+       will become an orphan.  Otherwise, the orphan source with the smallest
+       reference ID will be selected.  This ensures a group of servers polling
+       each other (with the same orphan configuration) which have no external
+       source can settle down to a state where only one server is serving its
+       local unsychronised time and others are synchronised to it. */
+
+    if (si->stratum >= orphan_stratum && sources[i]->type == SRC_NTP) {
+      sources[i]->status = SRC_ORPHAN;
+
+      if (si->stratum == orphan_stratum && sources[i]->reachability &&
+          (orphan_source == INVALID_SOURCE ||
+           sources[i]->ref_id < sources[orphan_source]->ref_id))
+        orphan_source = i;
+
+      continue;
+    }
+
     ++n_sel_sources;
+  }
+
+  /* If no selectable source is available, consider the orphan source */
+  if (!n_sel_sources && orphan_source != INVALID_SOURCE) {
+    uint32_t local_ref_id = NSR_GetLocalRefid(sources[orphan_source]->ip_addr);
+
+    if (!local_ref_id) {
+      LOG(LOGS_ERR, LOGF_Sources, "Unknown local refid in orphan mode");
+    } else if (sources[orphan_source]->ref_id < local_ref_id) {
+      sources[orphan_source]->status = SRC_OK;
+      n_sel_sources = 1;
+      DEBUG_LOG(LOGF_Sources, "selecting orphan refid=%"PRIx32,
+                sources[orphan_source]->ref_id);
+    }
+  }
+
+  for (i = 0; i < n_sources; i++) {
+    if (sources[i]->status != SRC_OK)
+      continue;
+
+    si = &sources[i]->sel_info;
 
     j1 = n_endpoints;
     j2 = j1 + 1;
@@ -736,22 +800,27 @@ 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;
 
@@ -759,14 +828,20 @@ 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:
@@ -774,9 +849,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
     }
   }
 
-  if (best_depth <= n_sel_sources / 2) {
+  if (best_depth <= n_sel_sources / 2 && !best_trust_depth) {
-    /* Could not even get half the reachable sources to agree -
+    /* Could not even get half the reachable sources to agree and there
-       clearly we can't synchronise. */
+       are no trusted sources - clearly we can't synchronise */
 
     if (selected_source_index != INVALID_SOURCE) {
       log_selection_message("Can't synchronise: no majority", NULL);
@@ -797,28 +872,38 @@ 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
+    /* Check if source's interval contains the best interval, or is wholly
-       list */
+       contained within it.  If there are any trusted sources the first
-    /* Check if source's interval contains the best interval, or
+       condition is applied only to them to not allow non-trusted sources to
-       is wholly contained within it */
+       move the final offset outside the interval. */
-    if ((sources[i]->sel_info.lo_limit <= best_lo &&
+    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 if (sources[i]->sel_info.lo_limit <= best_lo &&
+               sources[i]->sel_info.hi_limit >= best_hi) {
+      sources[i]->status = SRC_UNTRUSTED;
     } else {
       sources[i]->status = SRC_FALSETICKER;
     }
   }
 
-  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);
@@ -844,12 +929,12 @@ 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 = 0; i < n_sel_sources; i++) {
-    if (sources[sel_sources[i]]->sel_option == SRC_SelectPrefer)
+    if (sources[sel_sources[i]]->sel_options & SRC_SELECT_PREFER)
       break;
   }
   if (i < n_sel_sources) {
     for (i = j = 0; i < n_sel_sources; i++) {
-      if (sources[sel_sources[i]]->sel_option != SRC_SelectPrefer)
+      if (!(sources[sel_sources[i]]->sel_options & SRC_SELECT_PREFER))
         sources[sel_sources[i]]->status = SRC_NONPREFERRED;
       else
         sel_sources[j++] = sel_sources[i];
@@ -885,7 +970,7 @@ 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;
@@ -1227,6 +1312,7 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
       case SRC_BAD_STATS:
       case SRC_BAD_DISTANCE:
       case SRC_STALE:
+      case SRC_ORPHAN:
       case SRC_WAITS_STATS:
         report->state = RPT_UNREACH;
         break;
@@ -1236,6 +1322,7 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
       case SRC_JITTERY:
         report->state = RPT_JITTERY;
         break;
+      case SRC_UNTRUSTED:
       case SRC_WAITS_SOURCES:
       case SRC_NONPREFERRED:
       case SRC_WAITS_UPDATE:
@@ -1255,20 +1342,7 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timeval *now)
         break;
     }
 
-    switch (src->sel_option) {
+    report->sel_options = src->sel_options;
-      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->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 */

stubs.c

@@ -38,13 +38,12 @@
 #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 {
@@ -57,14 +56,14 @@ static void
 resolve_name(void *anything)
 {
   struct DNS_Async_Instance *inst;
-  IPAddr addrs[MAX_ADDRESSES];
+  IPAddr addrs[DNS_MAX_ADDRESSES];
   DNS_Status status;
   int i;
 
   inst = (struct DNS_Async_Instance *)anything;
-  status = DNS_Name2IPAddress(inst->name, addrs, MAX_ADDRESSES);
+  status = PRV_Name2IPAddress(inst->name, addrs, DNS_MAX_ADDRESSES);
 
-  for (i = 0; status == DNS_Success && i < MAX_ADDRESSES &&
+  for (i = 0; status == DNS_Success && i < DNS_MAX_ADDRESSES &&
        addrs[i].family != IPADDR_UNSPEC; i++)
     ;
 
@@ -231,6 +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

@@ -36,8 +36,6 @@
 #include "sys_linux.h"
 #elif defined(SOLARIS)
 #include "sys_solaris.h"
-#elif defined(SUNOS)
-#include "sys_sunos.h"
 #elif defined(NETBSD) || defined(FREEBSD)
 #include "sys_netbsd.h"
 #elif defined(MACOSX)
@@ -53,8 +51,6 @@ SYS_Initialise(void)
   SYS_Linux_Initialise();
 #elif defined(SOLARIS)
   SYS_Solaris_Initialise();
-#elif defined(SUNOS)
-  SYS_SunOS_Initialise();
 #elif defined(NETBSD) || defined(FREEBSD)
   SYS_NetBSD_Initialise();
 #elif defined(MACOSX)
@@ -73,8 +69,6 @@ SYS_Finalise(void)
   SYS_Linux_Finalise();
 #elif defined(SOLARIS)
   SYS_Solaris_Finalise();
-#elif defined(SUNOS)
-  SYS_SunOS_Finalise();
 #elif defined(NETBSD) || defined(FREEBSD)
   SYS_NetBSD_Finalise();
 #elif defined(MACOSX)
@@ -90,8 +84,12 @@ void SYS_DropRoot(uid_t uid, gid_t gid)
 {
 #if defined(LINUX) && defined (FEAT_PRIVDROP)
   SYS_Linux_DropRoot(uid, gid);
-#elif defined(NETBSD) && defined(FEAT_PRIVDROP)
+#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

sys_generic.c

@@ -34,6 +34,7 @@
 #include "local.h"
 #include "localp.h"
 #include "logging.h"
+#include "privops.h"
 #include "sched.h"
 #include "util.h"
 
@@ -76,9 +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;
@@ -173,8 +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);
 
@@ -245,9 +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,
@@ -259,7 +256,7 @@ update_slew(void)
 static void
 handle_end_of_slew(void *anything)
 {
-  slew_timer_running = 0;
+  slew_timeout_id = 0;
   update_slew();
 }
 
@@ -333,7 +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;
   }
@@ -410,10 +407,9 @@ SYS_Generic_Finalise(void)
 
   /* 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);
+  SCH_RemoveTimeout(slew_timeout_id);
-    slew_timer_running = 0;
+  slew_timeout_id = 0;
-  }
 
   (*drv_set_freq)(clamp_freq(base_freq));
 

sys_linux.c

@@ -45,12 +45,12 @@
 #ifdef FEAT_PRIVDROP
 #include <sys/prctl.h>
 #include <sys/capability.h>
-#include <grp.h>
 #endif
 
 #ifdef FEAT_SCFILTER
 #include <sys/prctl.h>
 #include <seccomp.h>
+#include <termios.h>
 #ifdef FEAT_PHC
 #include <linux/ptp_clock.h>
 #endif
@@ -66,6 +66,8 @@
 #include "sys_timex.h"
 #include "conf.h"
 #include "logging.h"
+#include "privops.h"
+#include "util.h"
 
 /* Frequency scale to convert from ppm to the timex freq */
 #define FREQ_SCALE (double)(1 << 16)
@@ -403,25 +405,20 @@ SYS_Linux_Finalise(void)
 void
 SYS_Linux_DropRoot(uid_t uid, gid_t gid)
 {
+  const char *cap_text;
   cap_t cap;
 
   if (prctl(PR_SET_KEEPCAPS, 1)) {
     LOG_FATAL(LOGF_SysLinux, "prctl() failed");
   }
   
-  if (setgroups(0, NULL)) {
+  UTI_DropRoot(uid, gid);
-    LOG_FATAL(LOGF_SysLinux, "setgroups() failed");
-  }
 
-  if (setgid(gid)) {
+  /* Keep CAP_NET_BIND_SERVICE only if NTP port can be opened */
-    LOG_FATAL(LOGF_SysLinux, "setgid(%d) failed", gid);
+  cap_text = CNF_GetNTPPort() ?
-  }
+             "cap_net_bind_service,cap_sys_time=ep" : "cap_sys_time=ep";
 
-  if (setuid(uid)) {
+  if ((cap = cap_from_text(cap_text)) == NULL) {
-    LOG_FATAL(LOGF_SysLinux, "setuid(%d) failed", uid);
-  }
-
-  if ((cap = cap_from_text("cap_net_bind_service,cap_sys_time=ep")) == NULL) {
     LOG_FATAL(LOGF_SysLinux, "cap_from_text() failed");
   }
 
@@ -430,8 +427,6 @@ SYS_Linux_DropRoot(uid_t uid, gid_t gid)
   }
 
   cap_free(cap);
-
-  DEBUG_LOG(LOGF_SysLinux, "Root dropped to uid %d gid %d", uid, gid);
 }
 #endif
 
@@ -460,15 +455,17 @@ SYS_Linux_EnableSystemCallFilter(int level)
     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(clone), SCMP_SYS(exit), SCMP_SYS(exit_group), SCMP_SYS(getrlimit),
-    SCMP_SYS(rt_sigreturn), SCMP_SYS(sigreturn),
+    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(munmap), SCMP_SYS(shmdt),
+    SCMP_SYS(mprotect), SCMP_SYS(mremap), SCMP_SYS(munmap), SCMP_SYS(shmdt),
     /* Filesystem */
-    SCMP_SYS(chmod), SCMP_SYS(chown), SCMP_SYS(chown32), SCMP_SYS(fstat),
+    SCMP_SYS(access), SCMP_SYS(chmod), SCMP_SYS(chown), SCMP_SYS(chown32),
-    SCMP_SYS(fstat64), SCMP_SYS(lseek), SCMP_SYS(rename), SCMP_SYS(stat),
+    SCMP_SYS(fstat), SCMP_SYS(fstat64), SCMP_SYS(lseek), SCMP_SYS(rename),
-    SCMP_SYS(stat64), SCMP_SYS(unlink),
+    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),
@@ -502,7 +499,7 @@ SYS_Linux_EnableSystemCallFilter(int level)
   const static int fcntls[] = { F_GETFD, F_SETFD };
 
   const static unsigned long ioctls[] = {
-    FIONREAD,
+    FIONREAD, TCGETS,
 #ifdef FEAT_PPS
     PTP_SYS_OFFSET,
 #endif
@@ -520,6 +517,12 @@ SYS_Linux_EnableSystemCallFilter(int level)
   /* 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");

sys_macosx.c

@@ -31,25 +31,18 @@
 
 #ifdef MACOSX
 
-#include <sys/sysctl.h>
+#include "sysincl.h"
-#include <sys/time.h>
-
-#include <nlist.h>
-#include <fcntl.h>
-#include <assert.h>
-#include <sys/time.h>
-
-#include <stdio.h>
-#include <signal.h>
 
 #include <mach/mach.h>
 #include <mach/mach_time.h>
 #include <pthread.h>
 
 #include "sys_macosx.h"
+#include "conf.h"
 #include "localp.h"
-#include "sched.h"
 #include "logging.h"
+#include "sched.h"
+#include "privops.h"
 #include "util.h"
 
 /* ================================================== */
@@ -96,6 +89,11 @@ static struct timeval Tdrift;
 
 #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
@@ -113,11 +111,12 @@ clock_initialise(void)
     LOG_FATAL(LOGF_SysMacOSX, "gettimeofday() failed");
   }
   Tdrift = T0;
+  last_rtc_sync = T0;
 
   newadj.tv_sec = 0;
   newadj.tv_usec = 0;
 
-  if (adjtime(&newadj, &oldadj) < 0) {
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0) {
     LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
   }
 }
@@ -169,7 +168,7 @@ start_adjust(void)
   UTI_TimevalToDouble(&newadj, &adjustment_requested);
   rounding_error = adjust_required - adjustment_requested;
 
-  if (adjtime(&newadj, &oldadj) < 0) {
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0) {
     LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
   }
 
@@ -193,7 +192,7 @@ stop_adjust(void)
   zeroadj.tv_sec = 0;
   zeroadj.tv_usec = 0;
 
-  if (adjtime(&zeroadj, &remadj) < 0) {
+  if (PRV_AdjustTime(&zeroadj, &remadj) < 0) {
     LOG_FATAL(LOGF_SysMacOSX, "adjtime() failed");
   }
 
@@ -244,12 +243,12 @@ apply_step_offset(double offset)
 
   UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
 
-  if (settimeofday(&new_time, NULL) < 0) {
+  if (PRV_SetTime(&new_time, NULL) < 0) {
     DEBUG_LOG(LOGF_SysMacOSX, "settimeofday() failed");
     return 0;
   }
 
-  UTI_AddDoubleToTimeval(&T0, offset, &T1);
+  UTI_AddDoubleToTimeval(&T0, -offset, &T1);
   T0 = T1;
 
   start_adjust();
@@ -294,7 +293,6 @@ get_offset_correction(struct timeval *raw,
 
 /* Cancel systematic drift */
 
-static int drift_removal_running = 0;
 static SCH_TimeoutID drift_removal_id;
 
 /* ================================================== */
@@ -326,7 +324,8 @@ drift_removal_timeout(SCH_ArbitraryArgument not_used)
 
 /* ================================================== */
 
-/* use est_error to calculate the drift_removal_interval */
+/* 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)
@@ -336,6 +335,20 @@ set_sync_status(int synchronised, double est_error, double max_error)
   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);
 
@@ -401,6 +414,17 @@ SYS_MacOSX_SetScheduler(int SchedPriority)
 
 /* ================================================== */
 
+#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)
 {
@@ -414,7 +438,6 @@ SYS_MacOSX_Initialise(void)
 
 
   drift_removal_id = SCH_AddTimeoutByDelay(drift_removal_interval, drift_removal_timeout, NULL);
-  drift_removal_running = 1;
 }
 
 /* ================================================== */
@@ -422,9 +445,7 @@ SYS_MacOSX_Initialise(void)
 void
 SYS_MacOSX_Finalise(void)
 {
-  if (drift_removal_running) {
+  SCH_RemoveTimeout(drift_removal_id);
-    SCH_RemoveTimeout(drift_removal_id);
-  }
 
   clock_finalise();
 }

sys_macosx.h

@@ -31,6 +31,7 @@
 #define GOT_SYS_MACOSX_H
 
 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);
 

sys_netbsd.c

@@ -23,7 +23,7 @@
 
   =======================================================================
 
-  Driver file for the NetBSD operating system.
+  Driver file for the NetBSD and FreeBSD operating system.
   */
 
 #include "config.h"
@@ -33,6 +33,7 @@
 #include "sys_netbsd.h"
 #include "sys_timex.h"
 #include "logging.h"
+#include "privops.h"
 #include "util.h"
 
 /* Maximum frequency offset accepted by the kernel (in ppm) */
@@ -62,14 +63,14 @@ accrue_offset(double offset, double corr_rate)
 
   UTI_DoubleToTimeval(-offset, &newadj);
 
-  if (adjtime(&newadj, &oldadj) < 0)
+  if (PRV_AdjustTime(&newadj, &oldadj) < 0)
     LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
 
   /* Add the old remaining adjustment if not zero */
   UTI_TimevalToDouble(&oldadj, &offset);
   if (offset != 0.0) {
     UTI_AddDoubleToTimeval(&newadj, offset, &newadj);
-    if (adjtime(&newadj, NULL) < 0)
+    if (PRV_AdjustTime(&newadj, NULL) < 0)
       LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
   }
 }
@@ -83,7 +84,7 @@ get_offset_correction(struct timeval *raw,
   struct timeval remadj;
   double adjustment_remaining;
 
-  if (adjtime(NULL, &remadj) < 0)
+  if (PRV_AdjustTime(NULL, &remadj) < 0)
     LOG_FATAL(LOGF_SysNetBSD, "adjtime() failed");
 
   UTI_TimevalToDouble(&remadj, &adjustment_remaining);
@@ -122,23 +123,22 @@ SYS_NetBSD_Finalise(void)
 void
 SYS_NetBSD_DropRoot(uid_t uid, gid_t gid)
 {
+#ifdef NETBSD
   int fd;
+#endif
 
-  if (setgroups(0, NULL))
+  /* On NetBSD the helper is used only for socket binding, but on FreeBSD
-    LOG_FATAL(LOGF_SysNetBSD, "setgroups() failed : %s", strerror(errno));
+     it's used also for setting and adjusting the system clock */
+  PRV_StartHelper();
 
-  if (setgid(gid))
+  UTI_DropRoot(uid, gid);
-    LOG_FATAL(LOGF_SysNetBSD, "setgid(%d) failed : %s", gid, strerror(errno));
-
-  if (setuid(uid))
-    LOG_FATAL(LOGF_SysNetBSD, "setuid(%d) failed : %s", uid, strerror(errno));
-
-  DEBUG_LOG(LOGF_SysNetBSD, "Root dropped to uid %d gid %d", 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_solaris.c

@@ -28,8 +28,10 @@
 
 #include "sysincl.h"
 
+#include "privops.h"
 #include "sys_solaris.h"
 #include "sys_timex.h"
+#include "util.h"
 
 /* ================================================== */
 
@@ -37,7 +39,8 @@ void
 SYS_Solaris_Initialise(void)
 {
   /* 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);
+  SYS_Timex_InitialiseWithFunctions(32500, 1.0 / 100, NULL, NULL, NULL,
+                                    0.0, 0.0, NULL, NULL);
 }
 
 /* ================================================== */
@@ -47,3 +50,14 @@ SYS_Solaris_Finalise(void)
 {
   SYS_Timex_Finalise();
 }
+
+/* ================================================== */
+
+#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_timex.c

@@ -30,10 +30,15 @@
 #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"
@@ -41,6 +46,7 @@
 #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

sys_timex.h

@@ -27,8 +27,6 @@
 #ifndef GOT_SYS_TIMEX_H
 #define GOT_SYS_TIMEX_H
 
-#include <sys/timex.h>
-
 #include "localp.h"
 
 extern void SYS_Timex_Initialise(void);

sysincl.h

@@ -35,6 +35,7 @@
 #include <fcntl.h>
 #include <float.h>
 #include <glob.h>
+#include <grp.h>
 #include <math.h>
 #include <netdb.h>
 #include <netinet/in.h>
@@ -53,10 +54,15 @@
 #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>
 #elif HAVE_STDINT_H

test/simulation/001-defaults

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "default test settings"
 

test/simulation/002-largenetwork

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "large network"
 

test/simulation/003-largefreqoffset

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "large frequency offset"
 

test/simulation/004-largetimeoffset

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "large time offset"
 

test/simulation/005-externalstep

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "external time step"
 

test/simulation/006-largejitter

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "large jitter"
 

test/simulation/007-largewander

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "large wander"
 

test/simulation/008-ntpera

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "NTP eras"
 
 # Assume NTP_ERA_SPLIT is between years 1960 and 1990

test/simulation/009-sourceselection

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "source selection"
 
@@ -35,7 +35,6 @@ base_delay="(+ 1e-3 (equal 0.1 to 2) (equal 0.1 to 3))"
 run_test || test_fail
 check_chronyd_exit || test_fail
 check_source_selection || test_fail
-check_packet_interval || test_fail
 check_sync || test_fail
 
 test_pass

test/simulation/101-poll

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "minpoll/maxpoll options"
 
 wander=0.0

test/simulation/102-iburst

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "iburst option"
 
 freq_offset=1e-4

test/simulation/103-initstepslew

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "initstepslew directive"
 
 freq_offset=0.0

test/simulation/104-driftfile

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "driftfile directive"
 
 servers=0

test/simulation/105-ntpauth

@@ -1,20 +1,43 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "NTP authentication"
 
-server_conf="keyfile tmp/keys"
+server_conf="keyfile tmp/server.keys"
-client_conf="keyfile tmp/keys"
+client_conf="keyfile tmp/client.keys"
 
-cat > tmp/keys <<-EOF
+cat > tmp/server.keys <<-EOF
-1 $(tr -c -d 'a-zA-Z0-9' < /dev/urandom 2> /dev/null | head -c 24)
+1 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
-2 ASCII:$(tr -c -d 'a-zA-Z0-9' < /dev/urandom 2> /dev/null | head -c 24)
+2 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
-3 MD5 ASCII:$(tr -c -d 'a-zA-Z' < /dev/urandom 2> /dev/null | head -c 24)
+3 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
-4 MD5 HEX:$(tr -c -d '0-9A-F' < /dev/urandom 2> /dev/null | head -c 32)
+4 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
 EOF
 
-for key in 1 2 3 4; do
+cat > tmp/client.keys <<-EOF
+1 k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+2 ASCII:k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+3 MD5 ASCII:k]<j.Jtw^Oo;z5E>n\_0-x=)yP\f<)Z^
+4 MD5 HEX:6B5D3C6A2E4A74775E4F6F3B7A35453E6E5C5F302D783D2979505C663C295A5E
+EOF
+
+keys=4
+
+if grep -q 'FEAT_SECHASH 1' ../../config.h; then
+	hashes="MD5 SHA1 SHA256 SHA384 SHA512"
+else
+	hashes="MD5"
+fi
+
+for hash in $hashes; do
+	keys=$[$keys + 1]
+	key=$(echo $keys $hash HEX:$(tr -c -d '0-9A-F' < /dev/urandom 2> /dev/null | \
+		head -c $[$RANDOM % 64 * 2 + 2]))
+	echo "$key" >> tmp/server.keys
+	echo "$key" >> tmp/client.keys
+done
+
+for key in $(seq $keys); do
 	client_server_options="key $key"
 	run_test || test_fail
 	check_chronyd_exit || test_fail
@@ -31,7 +54,7 @@ check_chronyd_exit || test_fail
 check_sync && test_fail
 check_packet_interval || test_fail
 
-server_conf="keyfile tmp/keys"
+server_conf="keyfile tmp/server.keys"
 client_conf=""
 
 run_test || test_fail
@@ -40,10 +63,10 @@ check_chronyd_exit || test_fail
 check_sync && test_fail
 check_packet_interval || test_fail
 
-client_conf="keyfile tmp/keys"
+client_conf="keyfile tmp/client.keys"
 clients=2
 peers=2
-max_sync_time=300
+max_sync_time=500
 base_delay="$default_base_delay (* -1 (equal 0.1 from 3) (equal 0.1 to 1))"
 client_lpeer_options="key 1"
 client_rpeer_options="key 1"

test/simulation/106-refclock

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "SHM refclock"
 
 servers=0

test/simulation/107-allowdeny

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "allow/deny directives"
 

test/simulation/108-peer

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "NTP peers"
 

test/simulation/109-makestep

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "makestep directive"
 
 client_conf="makestep 0 -1

test/simulation/110-chronyc

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "chronyc"
 
@@ -13,7 +13,7 @@ check_chronyd_exit || test_fail
 
 check_chronyc_output "^Reference ID    : 192\.168\.123\.1 \(192\.168\.123\.1\)
 Stratum         : 2
-Ref time \(UTC\)  : Fri Jan  1 00:1.:.. 2010
+Ref time \(UTC\)  : Fri Jan 01 00:1.:.. 2010
 System time     : 0\.0000..... seconds (slow|fast) of NTP time
 Last offset     : [+-]0\.000...... seconds
 RMS offset      : 0\.000...... seconds

test/simulation/111-knownclient

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "reply to client configured as server"
 

test/simulation/112-port

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "port and acquisitionport directives"
 

test/simulation/113-leapsecond

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "leap second"
 
 export CLKNETSIM_START_DATE=$(TZ=UTC date -d 'Dec 30 2008 0:00:00' +'%s')

test/simulation/114-presend

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 test_start "presend option"
 
 min_sync_time=140

test/simulation/115-cmdmontime

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "cmdmon timestamps"
 
@@ -10,11 +10,11 @@ grep -q 'HAVE_LONG_TIME_T 1' ../../config.h || test_skip
 limit=2
 client_server_options="noselect"
 client_conf="local stratum 1"
-chronyc_start="0.5"
+chronyc_start="1.5"
 chronyc_conf="tracking"
 
 for year in `seq 1850 100 2300`; do
-	date="Jan  1 00:00:00 $year"
+	date="Jan 01 00:00:00 $year"
 	export CLKNETSIM_START_DATE=$(date -d "$date UTC" +'%s')
 	run_test || test_fail
 	check_chronyd_exit || test_fail

test/simulation/116-minsources

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. test.common
+. ./test.common
 
 test_start "minsources directive"