update copyright years

The commit 5dd288dc0c ("sources: reselect earlier when removing
selected source") didn't cover all paths that can lead to a missing log
message when all sources are removed.

Add a flag to track the loss of selection and postpone the log message
in transient states where no message is logged to avoid spamming in
normal operation. Call SRC_SelectSource() after removing the source
to get a log message if there are no (selectable) sources left.

Reported-by: Thomas Lange <thomas@corelatus.se>

Makefile.in

@@ -33,6 +33,8 @@ CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
 LDFLAGS = @LDFLAGS@
 
+GETDATE_CFLAGS = @GETDATE_CFLAGS@
+
 EXTRA_OBJS = @EXTRA_OBJS@
 
 OBJS = array.o cmdparse.o conf.o local.o logging.o main.o memory.o quantiles.o \
@@ -61,6 +63,8 @@ chronyd : $(OBJS)
 chronyc : $(CLI_OBJS)
 	$(CC) $(CFLAGS) -o chronyc $(CLI_OBJS) $(LDFLAGS) $(LIBS) $(EXTRA_CLI_LIBS)
 
+getdate.o: CFLAGS += $(GETDATE_CFLAGS)
+
 distclean : clean
 	$(MAKE) -C doc distclean
 	$(MAKE) -C test/unit distclean

NEWS

@@ -1,3 +1,43 @@
+New in version 4.5
+==================
+
+Enhancements
+------------
+* Add support for AES-GCM-SIV in GnuTLS
+* Add support for corrections from PTP transparent clocks
+* Add support for systemd socket activation
+
+Bug fixes
+---------
+* Fix presend in interleaved mode
+* Fix reloading of modified sources from sourcedir
+
+New in version 4.4
+==================
+
+Enhancements
+------------
+* Add support for AES-GCM-SIV with Nettle >= 3.9 to shorten NTS
+  cookies to avoid some length-specific blocking of NTP on Internet
+* Add support for multiple refclocks using extpps option on one PHC
+* Add maxpoll option to hwtimestamp directive to improve PHC tracking
+  with low packet rates
+* Add hwtstimeout directive to configure timeout for late timestamps
+* Handle late hardware transmit timestamps of NTP requests on all sockets
+* Handle mismatched 32/64-bit time_t in SOCK refclock samples
+* Improve source replacement
+* Log important changes made by command requests (chronyc)
+* Refresh address of NTP sources periodically
+* Request nanosecond kernel RX timestamping on FreeBSD
+* Set DSCP for IPv6 packets
+* Shorten NTS-KE retry interval when network is down
+* Update seccomp filter for musl
+* Warn if loading keys from file with unexpected permissions
+* Warn if source selection fails or falseticker is detected
+* Add selectopts command to modify source-specific selection options
+* Add timestamp sources to serverstats report and make its fields 64-bit
+* Add -e option to chronyc to indicate end of response
+
 New in version 4.3
 ==================
 

README

@@ -47,32 +47,7 @@ Frequently Asked Questions (FAQ).
 The documentation is also available on the chrony web pages, accessible
 through the URL 
 
-    https://chrony.tuxfamily.org/
-
-Where are new versions announced?
-=================================
-
-There is a low volume mailing list where new versions and other
-important news relating to chrony are announced.  You can join this list
-by sending mail with the subject "subscribe" to
-
-chrony-announce-request@chrony.tuxfamily.org
-
-How can I get support for chrony?
-=================================
-
-There are two other mailing lists relating to chrony.  chrony-users is a
-discussion list for users, e.g. for questions about chrony configuration
-and bug reports.  chrony-dev is a more technical list for developers,
-e.g. for submitting patches and discussing how new features should be
-implemented.  To subscribe to either of these lists, send a message with
-the subject "subscribe" to
-
-chrony-users-request@chrony.tuxfamily.org
-or
-chrony-dev-request@chrony.tuxfamily.org
-
-as applicable.
+    https://chrony-project.org/
 
 License
 =======
@@ -108,6 +83,7 @@ Erik Bryer <ebryer@spots.ab.ca>
 Jonathan Cameron <jic23@cam.ac.uk>
 Bryan Christianson <bryan@whatroute.net>
 Juliusz Chroboczek <jch@pps.jussieu.fr>
+Dan Drown <dan-ntp@drown.org>
 Kamil Dudka <kdudka@redhat.com>
 Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Paul Elliott <pelliott@io.com>
@@ -121,6 +97,7 @@ Juergen Hannken-Illjes <hannken@eis.cs.tu-bs.de>
 John Hasler <john@dhh.gt.org>
 Tjalling Hattink <t.hattink@fugro.nl>
 Liam Hatton <me@liamhatton.com>
+Holger Hoffstätte <holger@applied-asynchrony.com>
 Jachym Holecek <jakym@volny.cz>
 Håkan Johansson <f96hajo@chalmers.se>
 Jim Knoble <jmknoble@pobox.com>
@@ -136,15 +113,19 @@ Victor Moroz <vim@prv.adlum.ru>
 Kalle Olavi Niemitalo  <tosi@stekt.oulu.fi>
 Frank Otto <sandwichmacher@web.de>
 Denny Page <dennypage@me.com>
+Rupesh Patel <rupatel@redhat.com>
 Chris Perl <cperl@janestreet.com>
 Gautier PHILIPPON <gautier.philippon@ensimag.grenoble-inp.fr>
 Andreas Piesk <apiesk@virbus.de>
+Mike Ryan <msr@hsilop.net>
 Baruch Siach <baruch@tkos.co.il>
+Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
 Foster Snowhill <forst@forstwoof.ru>
 Andreas Steinmetz <ast@domdv.de>
 NAKAMURA Takumi <takumi@ps.sakura.ne.jp>
 Timo Teras <timo.teras@iki.fi>
 Bill Unruh <unruh@physics.ubc.ca>
+Luke Valenta <lvalenta@cloudflare.com>
 Stephen Wadeley <swadeley@redhat.com>
 Bernhard Weiss <lisnablagh@web.de>
 Wolfgang Weisselberg <weissel@netcologne.de>

array.c

@@ -116,6 +116,21 @@ ARR_AppendElement(ARR_Instance array, void *element)
   memcpy(e, element, array->elem_size);
 }
 
+void
+ARR_RemoveElement(ARR_Instance array, unsigned int index)
+{
+  void *e, *l;
+
+  e = ARR_GetElement(array, index);
+  l = ARR_GetElement(array, array->used - 1);
+
+  if (e < l)
+    memmove(e, (char *)e + array->elem_size, (char *)l - (char *)e);
+  array->used--;
+
+  realloc_array(array, array->used);
+}
+
 void
 ARR_SetSize(ARR_Instance array, unsigned int size)
 {

array.h

@@ -47,6 +47,9 @@ extern void *ARR_GetElements(ARR_Instance array);
 /* Add a new element to the end of the array */
 extern void ARR_AppendElement(ARR_Instance array, void *element);
 
+/* Remove element with given index */
+extern void ARR_RemoveElement(ARR_Instance array, unsigned int index);
+
 /* Set the size of the array */
 extern void ARR_SetSize(ARR_Instance array, unsigned int size);
 

candm.h

@@ -109,7 +109,8 @@
 #define REQ_SELECT_DATA 69
 #define REQ_RELOAD_SOURCES 70
 #define REQ_DOFFSET2 71
-#define N_REQUEST_TYPES 72
+#define REQ_MODIFY_SELECTOPTS 72
+#define N_REQUEST_TYPES 73
 
 /* Structure used to exchange timespecs independent of time_t size */
 typedef struct {
@@ -121,6 +122,12 @@ typedef struct {
 /* This is used in tv_sec_high for 32-bit timestamps */
 #define TV_NOHIGHSEC 0x7fffffff
 
+/* Structure for 64-bit integers (not requiring 64-bit alignment) */
+typedef struct {
+  uint32_t high;
+  uint32_t low;
+} Integer64;
+
 /* 32-bit floating-point format consisting of 7-bit signed exponent
    and 25-bit signed coefficient without hidden bit.
    The result is calculated as: 2^(exp - 25) * coef */
@@ -270,7 +277,8 @@ typedef struct {
 #define REQ_ADDSRC_BURST 0x100
 #define REQ_ADDSRC_NTS 0x200
 #define REQ_ADDSRC_COPY 0x400
-#define REQ_ADDSRC_EF_EXP1 0x800
+#define REQ_ADDSRC_EF_EXP_MONO_ROOT 0x800
+#define REQ_ADDSRC_EF_EXP_NET_CORRECTION 0x1000
 
 typedef struct {
   uint32_t type;
@@ -371,6 +379,15 @@ typedef struct {
   int32_t EOR;
 } REQ_SelectData;
 
+/* Mask and options reuse the REQ_ADDSRC flags */
+typedef struct {
+  IPAddr address;
+  uint32_t ref_id;
+  uint32_t mask;
+  uint32_t options;
+  int32_t EOR;
+} REQ_Modify_SelectOpts;
+
 /* ================================================== */
 
 #define PKT_TYPE_CMD_REQUEST 1
@@ -477,6 +494,7 @@ typedef struct {
     REQ_NTPSourceName ntp_source_name;
     REQ_AuthData auth_data;
     REQ_SelectData select_data;
+    REQ_Modify_SelectOpts modify_select_opts;
   } data; /* Command specific parameters */
 
   /* Padding used to prevent traffic amplification.  It only defines the
@@ -519,7 +537,8 @@ typedef struct {
 #define RPY_SERVER_STATS2 22
 #define RPY_SELECT_DATA 23
 #define RPY_SERVER_STATS3 24
-#define N_REPLY_TYPES 25
+#define RPY_SERVER_STATS4 25
+#define N_REPLY_TYPES 26
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -654,17 +673,24 @@ typedef struct {
 } RPY_ClientAccessesByIndex;
 
 typedef struct {
-  uint32_t ntp_hits;
-  uint32_t nke_hits;
-  uint32_t cmd_hits;
-  uint32_t ntp_drops;
-  uint32_t nke_drops;
-  uint32_t cmd_drops;
-  uint32_t log_drops;
-  uint32_t ntp_auth_hits;
-  uint32_t ntp_interleaved_hits;
-  uint32_t ntp_timestamps;
-  uint32_t ntp_span_seconds;
+  Integer64 ntp_hits;
+  Integer64 nke_hits;
+  Integer64 cmd_hits;
+  Integer64 ntp_drops;
+  Integer64 nke_drops;
+  Integer64 cmd_drops;
+  Integer64 log_drops;
+  Integer64 ntp_auth_hits;
+  Integer64 ntp_interleaved_hits;
+  Integer64 ntp_timestamps;
+  Integer64 ntp_span_seconds;
+  Integer64 ntp_daemon_rx_timestamps;
+  Integer64 ntp_daemon_tx_timestamps;
+  Integer64 ntp_kernel_rx_timestamps;
+  Integer64 ntp_kernel_tx_timestamps;
+  Integer64 ntp_hw_rx_timestamps;
+  Integer64 ntp_hw_tx_timestamps;
+  Integer64 reserved[4];
   int32_t EOR;
 } RPY_ServerStats;
 

client.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Lonnie Abelbeck  2016, 2018
- * Copyright (C) Miroslav Lichvar  2009-2021
+ * Copyright (C) Miroslav Lichvar  2009-2023
  * 
  * 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
@@ -71,6 +71,8 @@ static int source_names = 0;
 
 static int csv_mode = 0;
 
+static int end_dot = 0;
+
 /* ================================================== */
 /* Log a message. This is a minimalistic replacement of the logging.c
    implementation to avoid linking with it and other modules. */
@@ -869,6 +871,17 @@ process_cmd_doffset(CMD_Request *msg, char *line)
 
 /* ================================================== */
 
+static int
+convert_addsrc_sel_options(int options)
+{
+  return (options & SRC_SELECT_PREFER ? REQ_ADDSRC_PREFER : 0) |
+         (options & SRC_SELECT_NOSELECT ? REQ_ADDSRC_NOSELECT : 0) |
+         (options & SRC_SELECT_TRUST ? REQ_ADDSRC_TRUST : 0) |
+         (options & SRC_SELECT_REQUIRE ? REQ_ADDSRC_REQUIRE : 0);
+}
+
+/* ================================================== */
+
 static int
 process_cmd_add_source(CMD_Request *msg, char *line)
 {
@@ -945,11 +958,11 @@ process_cmd_add_source(CMD_Request *msg, char *line)
           (data.params.burst ? REQ_ADDSRC_BURST : 0) |
           (data.params.nts ? REQ_ADDSRC_NTS : 0) |
           (data.params.copy ? REQ_ADDSRC_COPY : 0) |
-          (data.params.ext_fields & NTP_EF_FLAG_EXP1 ? REQ_ADDSRC_EF_EXP1 : 0) |
-          (data.params.sel_options & SRC_SELECT_PREFER ? REQ_ADDSRC_PREFER : 0) |
-          (data.params.sel_options & SRC_SELECT_NOSELECT ? REQ_ADDSRC_NOSELECT : 0) |
-          (data.params.sel_options & SRC_SELECT_TRUST ? REQ_ADDSRC_TRUST : 0) |
-          (data.params.sel_options & SRC_SELECT_REQUIRE ? REQ_ADDSRC_REQUIRE : 0));
+          (data.params.ext_fields & NTP_EF_FLAG_EXP_MONO_ROOT ?
+           REQ_ADDSRC_EF_EXP_MONO_ROOT : 0) |
+          (data.params.ext_fields & NTP_EF_FLAG_EXP_NET_CORRECTION ?
+           REQ_ADDSRC_EF_EXP_NET_CORRECTION : 0) |
+          convert_addsrc_sel_options(data.params.sel_options));
       msg->data.ntp_source.filter_length = htonl(data.params.filter_length);
       msg->data.ntp_source.cert_set = htonl(data.params.cert_set);
       msg->data.ntp_source.max_delay_quant =
@@ -1013,6 +1026,7 @@ give_help(void)
     "sources [-a] [-v]\0Display information about current sources\0"
     "sourcestats [-a] [-v]\0Display statistics about collected measurements\0"
     "selectdata [-a] [-v]\0Display information about source selection\0"
+    "selectopts <address|refid> <+|-options>\0Modify selection options\0"
     "reselect\0Force reselecting synchronisation source\0"
     "reselectdist <dist>\0Modify reselection distance\0"
     "\0\0"
@@ -1127,8 +1141,8 @@ command_name_generator(const char *text, int state)
     "manual", "maxdelay", "maxdelaydevratio", "maxdelayratio", "maxpoll",
     "maxupdateskew", "minpoll", "minstratum", "ntpdata", "offline", "online", "onoffline",
     "polltarget", "quit", "refresh", "rekey", "reload", "reselect", "reselectdist", "reset",
-    "retries", "rtcdata", "selectdata", "serverstats", "settime", "shutdown", "smoothing",
-    "smoothtime", "sourcename", "sources", "sourcestats",
+    "retries", "rtcdata", "selectdata", "selectopts", "serverstats", "settime",
+    "shutdown", "smoothing", "smoothtime", "sourcename", "sources", "sourcestats",
     "timeout", "tracking", "trimrtc", "waitsync", "writertc",
     NULL
   };
@@ -1156,7 +1170,7 @@ command_name_generator(const char *text, int state)
 
   while ((name = names[tab_complete_index][list_index++])) {
     if (strncmp(name, text, len) == 0) {
-      return strdup(name);
+      return Strdup(name);
     }
   }
 
@@ -1462,24 +1476,24 @@ request_reply(CMD_Request *request, CMD_Reply *reply, int requested_reply, int v
 /* ================================================== */
 
 static void
-print_seconds(unsigned long s)
+print_seconds(uint32_t s)
 {
-  unsigned long d;
+  uint32_t d;
 
   if (s == (uint32_t)-1) {
     printf("   -");
   } else if (s < 1200) {
-    printf("%4lu", s);
+    printf("%4"PRIu32, s);
   } else if (s < 36000) {
-    printf("%3lum", s / 60);
+    printf("%3"PRIu32"m", s / 60);
   } else if (s < 345600) {
-    printf("%3luh", s / 3600);
+    printf("%3"PRIu32"h", s / 3600);
   } else {
     d = s / 86400;
     if (d > 999) {
-      printf("%3luy", d / 365);
+      printf("%3"PRIu32"y", d / 365);
     } else {
-      printf("%3lud", d);
+      printf("%3"PRIu32"d", d);
     }
   }
 }
@@ -1610,8 +1624,9 @@ print_report(const char *format, ...)
   va_list ap;
   int i, field, sign, width, prec, spec;
   const char *string;
-  unsigned long long_uinteger;
   unsigned int uinteger;
+  uint64_t uinteger64;
+  uint32_t uinteger32;
   int integer;
   struct timespec *ts;
   struct tm *tm;
@@ -1709,9 +1724,9 @@ print_report(const char *format, ...)
                spec == 'O' ? "seconds" : "ppm",
                (dbl > 0.0) ^ (spec != 'O') ? "slow" : "fast");
         break;
-      case 'I': /* interval with unit */
-        long_uinteger = va_arg(ap, unsigned long);
-        print_seconds(long_uinteger);
+      case 'I': /* uint32_t interval with unit */
+        uinteger32 = va_arg(ap, uint32_t);
+        print_seconds(uinteger32);
         break;
       case 'L': /* leap status */
         integer = va_arg(ap, int);
@@ -1778,8 +1793,8 @@ print_report(const char *format, ...)
           print_freq_ppm(dbl);
         break;
       case 'R': /* reference ID in hexdecimal */
-        long_uinteger = va_arg(ap, unsigned long);
-        printf("%08lX", long_uinteger);
+        uinteger32 = va_arg(ap, uint32_t);
+        printf("%08"PRIX32, uinteger32);
         break;
       case 'S': /* offset with unit */
         dbl = va_arg(ap, double);
@@ -1796,14 +1811,18 @@ print_report(const char *format, ...)
         strftime(buf, sizeof (buf), "%a %b %d %T %Y", tm);
         printf("%s", buf);
         break;
-      case 'U': /* unsigned long in decimal */
-        long_uinteger = va_arg(ap, unsigned long);
-        printf("%*lu", width, long_uinteger);
+      case 'U': /* uint32_t in decimal */
+        uinteger32 = va_arg(ap, uint32_t);
+        printf("%*"PRIu32, width, uinteger32);
         break;
       case 'V': /* timespec as seconds since epoch */
         ts = va_arg(ap, struct timespec *);
         printf("%s", UTI_TimespecToString(ts));
         break;
+      case 'Q': /* uint64_t in decimal */
+        uinteger64 = va_arg(ap, uint64_t);
+        printf("%*"PRIu64, width, uinteger64);
+        break;
       case 'b': /* unsigned int in binary */
         uinteger = va_arg(ap, unsigned int);
         for (i = prec - 1; i >= 0; i--)
@@ -1963,7 +1982,7 @@ process_cmd_sources(char *line)
   IPAddr ip_addr;
   uint32_t i, mode, n_sources;
   char name[256], mode_ch, state_ch;
-  int all, verbose;
+  int all, verbose, ref;
 
   parse_sources_options(line, &all, &verbose);
   
@@ -2000,9 +2019,8 @@ process_cmd_sources(char *line)
     if (!all && ip_addr.family == IPADDR_ID)
       continue;
 
-    format_name(name, sizeof (name), 25,
-                mode == RPY_SD_MD_REF && ip_addr.family == IPADDR_INET4,
-                ip_addr.addr.in4, 1, &ip_addr);
+    ref = mode == RPY_SD_MD_REF && ip_addr.family == IPADDR_INET4;
+    format_name(name, sizeof (name), 25, ref, ref ? ip_addr.addr.in4 : 0, 1, &ip_addr);
 
     switch (mode) {
       case RPY_SD_MD_CLIENT:
@@ -2051,7 +2069,7 @@ process_cmd_sources(char *line)
                  ntohs(reply.data.source_data.stratum),
                  (int16_t)ntohs(reply.data.source_data.poll),
                  ntohs(reply.data.source_data.reachability),
-                 (unsigned long)ntohl(reply.data.source_data.since_sample),
+                 ntohl(reply.data.source_data.since_sample),
                  UTI_FloatNetworkToHost(reply.data.source_data.latest_meas),
                  UTI_FloatNetworkToHost(reply.data.source_data.orig_latest_meas),
                  UTI_FloatNetworkToHost(reply.data.source_data.latest_meas_err),
@@ -2112,9 +2130,9 @@ process_cmd_sourcestats(char *line)
 
     print_report("%-25s %3U %3U  %I %+P %P  %+S  %S\n",
                  name,
-                 (unsigned long)ntohl(reply.data.sourcestats.n_samples),
-                 (unsigned long)ntohl(reply.data.sourcestats.n_runs),
-                 (unsigned long)ntohl(reply.data.sourcestats.span_seconds),
+                 ntohl(reply.data.sourcestats.n_samples),
+                 ntohl(reply.data.sourcestats.n_runs),
+                 ntohl(reply.data.sourcestats.span_seconds),
                  UTI_FloatNetworkToHost(reply.data.sourcestats.resid_freq_ppm),
                  UTI_FloatNetworkToHost(reply.data.sourcestats.skew_ppm),
                  UTI_FloatNetworkToHost(reply.data.sourcestats.est_offset),
@@ -2162,7 +2180,7 @@ process_cmd_tracking(char *line)
                "Root dispersion : %.9f seconds\n"
                "Update interval : %.1f seconds\n"
                "Leap status     : %L\n",
-               (unsigned long)ref_id, name,
+               ref_id, name,
                ntohs(reply.data.tracking.stratum),
                &ref_time,
                UTI_FloatNetworkToHost(reply.data.tracking.current_correction),
@@ -2250,10 +2268,10 @@ process_cmd_authdata(char *line)
 
     print_report("%-27s %4s %5U %4d %4d %I %4d %4d %4d %4d\n",
                  name, mode_str,
-                 (unsigned long)ntohl(reply.data.auth_data.key_id),
+                 ntohl(reply.data.auth_data.key_id),
                  ntohs(reply.data.auth_data.key_type),
                  ntohs(reply.data.auth_data.key_length),
-                 (unsigned long)ntohl(reply.data.auth_data.last_ke_ago),
+                 ntohl(reply.data.auth_data.last_ke_ago),
                  ntohs(reply.data.auth_data.ke_attempts),
                  ntohs(reply.data.auth_data.nak),
                  ntohs(reply.data.auth_data.cookies),
@@ -2348,17 +2366,16 @@ process_cmd_ntpdata(char *line)
                  "Total RX        : %U\n"
                  "Total valid RX  : %U\n"
                  "Total good RX   : %U\n",
-                 UTI_IPToString(&remote_addr), (unsigned long)UTI_IPToRefid(&remote_addr),
+                 UTI_IPToString(&remote_addr), UTI_IPToRefid(&remote_addr),
                  ntohs(reply.data.ntp_data.remote_port),
-                 UTI_IPToString(&local_addr), (unsigned long)UTI_IPToRefid(&local_addr),
+                 UTI_IPToString(&local_addr), UTI_IPToRefid(&local_addr),
                  reply.data.ntp_data.leap, reply.data.ntp_data.version,
                  reply.data.ntp_data.mode, reply.data.ntp_data.stratum,
                  reply.data.ntp_data.poll, UTI_Log2ToDouble(reply.data.ntp_data.poll),
                  reply.data.ntp_data.precision, UTI_Log2ToDouble(reply.data.ntp_data.precision),
                  UTI_FloatNetworkToHost(reply.data.ntp_data.root_delay),
                  UTI_FloatNetworkToHost(reply.data.ntp_data.root_dispersion),
-                 (unsigned long)ntohl(reply.data.ntp_data.ref_id),
-                 reply.data.ntp_data.stratum <= 1 ?
+                 ntohl(reply.data.ntp_data.ref_id), reply.data.ntp_data.stratum <= 1 ?
                    UTI_RefidToString(ntohl(reply.data.ntp_data.ref_id)) : "",
                  &ref_time,
                  UTI_FloatNetworkToHost(reply.data.ntp_data.offset),
@@ -2372,10 +2389,10 @@ process_cmd_ntpdata(char *line)
                  ntohs(reply.data.ntp_data.flags) & RPY_NTP_FLAG_INTERLEAVED,
                  ntohs(reply.data.ntp_data.flags) & RPY_NTP_FLAG_AUTHENTICATED,
                  reply.data.ntp_data.tx_tss_char, reply.data.ntp_data.rx_tss_char,
-                 (unsigned long)ntohl(reply.data.ntp_data.total_tx_count),
-                 (unsigned long)ntohl(reply.data.ntp_data.total_rx_count),
-                 (unsigned long)ntohl(reply.data.ntp_data.total_valid_count),
-                 (unsigned long)ntohl(reply.data.ntp_data.total_good_count),
+                 ntohl(reply.data.ntp_data.total_tx_count),
+                 ntohl(reply.data.ntp_data.total_rx_count),
+                 ntohl(reply.data.ntp_data.total_valid_count),
+                 ntohl(reply.data.ntp_data.total_good_count),
                  REPORT_END);
   }
 
@@ -2447,7 +2464,7 @@ process_cmd_selectdata(char *line)
                  eff_options & RPY_SD_OPTION_TRUST ? 'T' : '-',
                  eff_options & RPY_SD_OPTION_REQUIRE ? 'R' : '-',
                  '-',
-                 (unsigned long)ntohl(reply.data.select_data.last_sample_ago),
+                 ntohl(reply.data.select_data.last_sample_ago),
                  UTI_FloatNetworkToHost(reply.data.select_data.score),
                  UTI_FloatNetworkToHost(reply.data.select_data.lo_limit),
                  UTI_FloatNetworkToHost(reply.data.select_data.hi_limit),
@@ -2467,31 +2484,43 @@ process_cmd_serverstats(char *line)
   CMD_Reply reply;
 
   request.command = htons(REQ_SERVER_STATS);
-  if (!request_reply(&request, &reply, RPY_SERVER_STATS3, 0))
+  if (!request_reply(&request, &reply, RPY_SERVER_STATS4, 0))
     return 0;
 
-  print_report("NTP packets received       : %U\n"
-               "NTP packets dropped        : %U\n"
-               "Command packets received   : %U\n"
-               "Command packets dropped    : %U\n"
-               "Client log records dropped : %U\n"
-               "NTS-KE connections accepted: %U\n"
-               "NTS-KE connections dropped : %U\n"
-               "Authenticated NTP packets  : %U\n"
-               "Interleaved NTP packets    : %U\n"
-               "NTP timestamps held        : %U\n"
-               "NTP timestamp span         : %U\n",
-               (unsigned long)ntohl(reply.data.server_stats.ntp_hits),
-               (unsigned long)ntohl(reply.data.server_stats.ntp_drops),
-               (unsigned long)ntohl(reply.data.server_stats.cmd_hits),
-               (unsigned long)ntohl(reply.data.server_stats.cmd_drops),
-               (unsigned long)ntohl(reply.data.server_stats.log_drops),
-               (unsigned long)ntohl(reply.data.server_stats.nke_hits),
-               (unsigned long)ntohl(reply.data.server_stats.nke_drops),
-               (unsigned long)ntohl(reply.data.server_stats.ntp_auth_hits),
-               (unsigned long)ntohl(reply.data.server_stats.ntp_interleaved_hits),
-               (unsigned long)ntohl(reply.data.server_stats.ntp_timestamps),
-               (unsigned long)ntohl(reply.data.server_stats.ntp_span_seconds),
+  print_report("NTP packets received       : %Q\n"
+               "NTP packets dropped        : %Q\n"
+               "Command packets received   : %Q\n"
+               "Command packets dropped    : %Q\n"
+               "Client log records dropped : %Q\n"
+               "NTS-KE connections accepted: %Q\n"
+               "NTS-KE connections dropped : %Q\n"
+               "Authenticated NTP packets  : %Q\n"
+               "Interleaved NTP packets    : %Q\n"
+               "NTP timestamps held        : %Q\n"
+               "NTP timestamp span         : %Q\n"
+               "NTP daemon RX timestamps   : %Q\n"
+               "NTP daemon TX timestamps   : %Q\n"
+               "NTP kernel RX timestamps   : %Q\n"
+               "NTP kernel TX timestamps   : %Q\n"
+               "NTP hardware RX timestamps : %Q\n"
+               "NTP hardware TX timestamps : %Q\n",
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_hits),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_drops),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.cmd_hits),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.cmd_drops),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.log_drops),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.nke_hits),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.nke_drops),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_auth_hits),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_interleaved_hits),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_span_seconds),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_daemon_rx_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_daemon_tx_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_kernel_rx_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_kernel_tx_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_hw_rx_timestamps),
+               UTI_Integer64NetworkToHost(reply.data.server_stats.ntp_hw_tx_timestamps),
                REPORT_END);
 
   return 1;
@@ -2573,7 +2602,7 @@ process_cmd_rtcreport(char *line)
                &ref_time,
                ntohs(reply.data.rtc.n_samples),
                ntohs(reply.data.rtc.n_runs),
-               (unsigned long)ntohl(reply.data.rtc.span_seconds),
+               ntohl(reply.data.rtc.span_seconds),
                UTI_FloatNetworkToHost(reply.data.rtc.rtc_seconds_fast),
                UTI_FloatNetworkToHost(reply.data.rtc.rtc_gain_rate_ppm),
                REPORT_END);
@@ -2648,16 +2677,15 @@ process_cmd_clients(char *line)
 
       print_report("%-25s  %6U  %5U  %C  %C  %I  %6U  %5U  %C  %I\n",
                    name,
-                   (unsigned long)ntohl(client->ntp_hits),
-                   (unsigned long)ntohl(client->ntp_drops),
+                   ntohl(client->ntp_hits),
+                   ntohl(client->ntp_drops),
                    client->ntp_interval,
                    client->ntp_timeout_interval,
-                   (unsigned long)ntohl(client->last_ntp_hit_ago),
-                   (unsigned long)ntohl(nke ? client->nke_hits : client->cmd_hits),
-                   (unsigned long)ntohl(nke ? client->nke_drops : client->cmd_drops),
+                   ntohl(client->last_ntp_hit_ago),
+                   ntohl(nke ? client->nke_hits : client->cmd_hits),
+                   ntohl(nke ? client->nke_drops : client->cmd_drops),
                    nke ? client->nke_interval : client->cmd_interval,
-                   (unsigned long)ntohl(nke ? client->last_nke_hit_ago :
-                                              client->last_cmd_hit_ago),
+                   ntohl(nke ? client->last_nke_hit_ago : client->last_cmd_hit_ago),
                    REPORT_END);
     }
 
@@ -2688,7 +2716,7 @@ process_cmd_manual_list(const char *line)
     return 0;
 
   n_samples = ntohl(reply.data.manual_list.n_samples);
-  print_info_field("210 n_samples = %lu\n", (unsigned long)n_samples);
+  print_info_field("210 n_samples = %"PRIu32"\n", n_samples);
 
   print_header("#    Date     Time(UTC)    Slewed   Original   Residual");
 
@@ -2808,11 +2836,11 @@ process_cmd_activity(const char *line)
                "%U sources doing burst (return to online)\n"
                "%U sources doing burst (return to offline)\n"
                "%U sources with unknown address\n",
-               (unsigned long)ntohl(reply.data.activity.online),
-               (unsigned long)ntohl(reply.data.activity.offline),
-               (unsigned long)ntohl(reply.data.activity.burst_online),
-               (unsigned long)ntohl(reply.data.activity.burst_offline),
-               (unsigned long)ntohl(reply.data.activity.unresolved),
+               ntohl(reply.data.activity.online),
+               ntohl(reply.data.activity.offline),
+               ntohl(reply.data.activity.burst_online),
+               ntohl(reply.data.activity.burst_offline),
+               ntohl(reply.data.activity.unresolved),
                REPORT_END);
 
   return 1;
@@ -2891,6 +2919,55 @@ process_cmd_reset(CMD_Request *msg, char *line)
 
 /* ================================================== */
 
+static int
+process_cmd_selectopts(CMD_Request *msg, char *line)
+{
+  int mask, options, option;
+  uint32_t ref_id;
+  IPAddr ip_addr;
+  char *src, *opt;
+
+  src = line;
+  line = CPS_SplitWord(line);
+  ref_id = 0;
+
+  /* Don't allow hostnames to avoid conflicts with reference IDs */
+  if (!UTI_StringToIdIP(src, &ip_addr) && !UTI_StringToIP(src, &ip_addr)) {
+    ip_addr.family = IPADDR_UNSPEC;
+    if (CPS_ParseRefid(src, &ref_id) == 0) {
+      LOG(LOGS_ERR, "Invalid syntax for selectopts command");
+      return 0;
+    }
+  }
+
+  mask = options = 0;
+
+  while (*line != '\0') {
+    opt = line;
+    line = CPS_SplitWord(line);
+
+    if ((opt[0] != '+' && opt[0] != '-') || (option = CPS_GetSelectOption(opt + 1)) == 0) {
+      LOG(LOGS_ERR, "Invalid syntax for selectopts command");
+      return 0;
+    }
+
+    mask |= option;
+    if (opt[0] == '+')
+      options |= option;
+  }
+
+  UTI_IPHostToNetwork(&ip_addr, &msg->data.modify_select_opts.address);
+  msg->data.modify_select_opts.ref_id = htonl(ref_id);
+  msg->data.modify_select_opts.mask = htonl(mask);
+  msg->data.modify_select_opts.options = htonl(convert_addsrc_sel_options(options));
+
+  msg->command = htons(REQ_MODIFY_SELECTOPTS);
+
+  return 1;
+}
+
+/* ================================================== */
+
 static int
 process_cmd_waitsync(char *line)
 {
@@ -2926,7 +3003,7 @@ process_cmd_waitsync(char *line)
       skew_ppm = UTI_FloatNetworkToHost(reply.data.tracking.skew_ppm);
 
       print_report("try: %d, refid: %R, correction: %.9f, skew: %.3f\n",
-                   i, (unsigned long)ref_id, correction, skew_ppm, REPORT_END);
+                   i, ref_id, correction, skew_ppm, REPORT_END);
 
       if ((ip_addr.family != IPADDR_UNSPEC ||
            (ref_id != 0 && ref_id != 0x7f7f0101L /* LOCAL refid */)) &&
@@ -3193,6 +3270,8 @@ process_line(char *line)
   } else if (!strcmp(command, "selectdata")) {
     do_normal_submit = 0;
     ret = process_cmd_selectdata(line);
+  } else if (!strcmp(command, "selectopts")) {
+    do_normal_submit = process_cmd_selectopts(&tx_message, line);
   } else if (!strcmp(command, "serverstats")) {
     do_normal_submit = 0;
     ret = process_cmd_serverstats(line);
@@ -3243,6 +3322,10 @@ process_line(char *line)
     ret = request_reply(&tx_message, &rx_message, RPY_NULL, 1);
   }
 
+  if (end_dot) {
+    printf(".\n");
+  }
+
   fflush(stderr);
 
   if (fflush(stdout) != 0 || ferror(stdout) != 0) {
@@ -3300,7 +3383,7 @@ static void
 display_gpl(void)
 {
     printf("chrony version %s\n"
-           "Copyright (C) 1997-2003, 2007, 2009-2022 Richard P. Curnow and others\n"
+           "Copyright (C) 1997-2003, 2007, 2009-2023 Richard P. Curnow and others\n"
            "chrony comes with ABSOLUTELY NO WARRANTY.  This is free software, and\n"
            "you are welcome to redistribute it under certain conditions.  See the\n"
            "GNU General Public License version 2 for details.\n\n",
@@ -3319,6 +3402,7 @@ print_help(const char *progname)
              "  -n\t\tDon't resolve hostnames\n"
              "  -N\t\tPrint original source names\n"
              "  -c\t\tEnable CSV format\n"
+             "  -e\t\tEnd responses with dot\n"
 #if DEBUG > 0
              "  -d\t\tEnable debug messages\n"
 #endif
@@ -3363,7 +3447,7 @@ main(int argc, char **argv)
   optind = 1;
 
   /* Parse short command-line options */
-  while ((opt = getopt(argc, argv, "+46acdf:h:mnNp:v")) != -1) {
+  while ((opt = getopt(argc, argv, "+46acdef:h:mnNp:v")) != -1) {
     switch (opt) {
       case '4':
       case '6':
@@ -3381,6 +3465,9 @@ main(int argc, char **argv)
         log_min_severity = LOGS_DEBUG;
 #endif
         break;
+      case 'e':
+        end_dot = 1;
+        break;
       case 'h':
         hostnames = optarg;
         break;

clientlog.c

@@ -126,7 +126,8 @@ static int active;
 /* RX and TX timestamp saved for clients using interleaved mode */
 typedef struct {
   uint64_t rx_ts;
-  uint16_t flags;
+  uint8_t flags;
+  uint8_t tx_ts_source;
   uint16_t slew_epoch;
   int32_t tx_ts_offset;
 } NtpTimestamps;
@@ -155,12 +156,17 @@ static NtpTimestampMap ntp_ts_map;
 /* Maximum number of timestamps moved in the array to insert a new timestamp */
 #define NTPTS_INSERT_LIMIT 64
 
+/* Maximum expected value of the timestamp source */
+#define MAX_NTP_TS NTP_TS_HARDWARE
+
 /* Global statistics */
-static uint32_t total_hits[MAX_SERVICES];
-static uint32_t total_drops[MAX_SERVICES];
-static uint32_t total_ntp_auth_hits;
-static uint32_t total_ntp_interleaved_hits;
-static uint32_t total_record_drops;
+static uint64_t total_hits[MAX_SERVICES];
+static uint64_t total_drops[MAX_SERVICES];
+static uint64_t total_ntp_auth_hits;
+static uint64_t total_ntp_interleaved_hits;
+static uint64_t total_record_drops;
+static uint64_t total_ntp_rx_timestamps[MAX_NTP_TS + 1];
+static uint64_t total_ntp_tx_timestamps[MAX_NTP_TS + 1];
 
 #define NSEC_PER_SEC 1000000000U
 
@@ -639,9 +645,14 @@ CLG_LimitServiceRate(CLG_Service service, int index)
 /* ================================================== */
 
 void
-CLG_LogAuthNtpRequest(void)
+CLG_UpdateNtpStats(int auth, NTP_Timestamp_Source rx_ts_src, NTP_Timestamp_Source tx_ts_src)
 {
-  total_ntp_auth_hits++;
+  if (auth)
+    total_ntp_auth_hits++;
+  if (rx_ts_src >= 0 && rx_ts_src <= MAX_NTP_TS)
+    total_ntp_rx_timestamps[rx_ts_src]++;
+  if (tx_ts_src >= 0 && tx_ts_src <= MAX_NTP_TS)
+    total_ntp_tx_timestamps[tx_ts_src]++;
 }
 
 /* ================================================== */
@@ -773,7 +784,8 @@ push_ntp_tss(uint32_t index)
 /* ================================================== */
 
 static void
-set_ntp_tx_offset(NtpTimestamps *tss, NTP_int64 *rx_ts, struct timespec *tx_ts)
+set_ntp_tx(NtpTimestamps *tss, NTP_int64 *rx_ts, struct timespec *tx_ts,
+           NTP_Timestamp_Source tx_src)
 {
   struct timespec ts;
 
@@ -792,12 +804,13 @@ set_ntp_tx_offset(NtpTimestamps *tss, NTP_int64 *rx_ts, struct timespec *tx_ts)
 
   tss->tx_ts_offset = (int32_t)ts.tv_nsec + (int32_t)ts.tv_sec * (int32_t)NSEC_PER_SEC;
   tss->flags |= NTPTS_VALID_TX;
+  tss->tx_ts_source = tx_src;
 }
 
 /* ================================================== */
 
 static void
-get_ntp_tx(NtpTimestamps *tss, struct timespec *tx_ts)
+get_ntp_tx(NtpTimestamps *tss, struct timespec *tx_ts, NTP_Timestamp_Source *tx_src)
 {
   int32_t offset = tss->tx_ts_offset;
   NTP_int64 ntp_ts;
@@ -814,12 +827,14 @@ get_ntp_tx(NtpTimestamps *tss, struct timespec *tx_ts)
   } else {
     UTI_ZeroTimespec(tx_ts);
   }
+
+  *tx_src = tss->tx_ts_source;
 }
 
 /* ================================================== */
 
 void
-CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts)
+CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts, NTP_Timestamp_Source tx_src)
 {
   NtpTimestamps *tss;
   uint32_t i, index;
@@ -877,7 +892,7 @@ CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts)
   tss->rx_ts = rx;
   tss->flags = 0;
   tss->slew_epoch = ntp_ts_map.slew_epoch;
-  set_ntp_tx_offset(tss, rx_ts, tx_ts);
+  set_ntp_tx(tss, rx_ts, tx_ts, tx_src);
 
   DEBUG_LOG("Saved RX+TX index=%"PRIu32" first=%"PRIu32" size=%"PRIu32,
             index, ntp_ts_map.first, ntp_ts_map.size);
@@ -921,7 +936,8 @@ CLG_UndoNtpTxTimestampSlew(NTP_int64 *rx_ts, struct timespec *tx_ts)
 /* ================================================== */
 
 void
-CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts)
+CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts,
+                         NTP_Timestamp_Source tx_src)
 {
   uint32_t index;
 
@@ -931,13 +947,14 @@ CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts)
   if (!find_ntp_rx_ts(ntp64_to_int64(rx_ts), &index))
     return;
 
-  set_ntp_tx_offset(get_ntp_tss(index), rx_ts, tx_ts);
+  set_ntp_tx(get_ntp_tss(index), rx_ts, tx_ts, tx_src);
 }
 
 /* ================================================== */
 
 int
-CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts)
+CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts,
+                      NTP_Timestamp_Source *tx_src)
 {
   NtpTimestamps *tss;
   uint32_t index;
@@ -953,7 +970,7 @@ CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts)
   if (tss->flags & NTPTS_DISABLED)
     return 0;
 
-  get_ntp_tx(tss, tx_ts);
+  get_ntp_tx(tss, tx_ts, tx_src);
 
   return 1;
 }
@@ -1085,4 +1102,10 @@ CLG_GetServerStatsReport(RPT_ServerStatsReport *report)
   report->ntp_span_seconds = ntp_ts_map.size > 1 ?
                              (get_ntp_tss(ntp_ts_map.size - 1)->rx_ts -
                               get_ntp_tss(0)->rx_ts) >> 32 : 0;
+  report->ntp_daemon_rx_timestamps = total_ntp_rx_timestamps[NTP_TS_DAEMON];
+  report->ntp_daemon_tx_timestamps = total_ntp_tx_timestamps[NTP_TS_DAEMON];
+  report->ntp_kernel_rx_timestamps = total_ntp_rx_timestamps[NTP_TS_KERNEL];
+  report->ntp_kernel_tx_timestamps = total_ntp_tx_timestamps[NTP_TS_KERNEL];
+  report->ntp_hw_rx_timestamps = total_ntp_rx_timestamps[NTP_TS_HARDWARE];
+  report->ntp_hw_tx_timestamps = total_ntp_tx_timestamps[NTP_TS_HARDWARE];
 }

clientlog.h

@@ -42,14 +42,18 @@ extern void CLG_Finalise(void);
 extern int CLG_GetClientIndex(IPAddr *client);
 extern int CLG_LogServiceAccess(CLG_Service service, IPAddr *client, struct timespec *now);
 extern int CLG_LimitServiceRate(CLG_Service service, int index);
-extern void CLG_LogAuthNtpRequest(void);
+extern void CLG_UpdateNtpStats(int auth, NTP_Timestamp_Source rx_ts_src,
+                               NTP_Timestamp_Source tx_ts_src);
 extern int CLG_GetNtpMinPoll(void);
 
 /* Functions to save and retrieve timestamps for server interleaved mode */
-extern void CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts);
+extern void CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts,
+                                  NTP_Timestamp_Source tx_src);
 extern void CLG_UndoNtpTxTimestampSlew(NTP_int64 *rx_ts, struct timespec *tx_ts);
-extern void CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts);
-extern int CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts);
+extern void CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts,
+                                     NTP_Timestamp_Source tx_src);
+extern int CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts,
+                                 NTP_Timestamp_Source *tx_src);
 extern void CLG_DisableNtpTimestamps(NTP_int64 *rx_ts);
 
 /* And some reporting functions, for use by chronyc. */

cmdmon.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2021
+ * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2023
  * 
  * 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
@@ -144,6 +144,7 @@ static const char permissions[] = {
   PERMIT_AUTH, /* SELECT_DATA */
   PERMIT_AUTH, /* RELOAD_SOURCES */
   PERMIT_AUTH, /* DOFFSET2 */
+  PERMIT_AUTH, /* MODIFY_SELECTOPTS */
 };
 
 /* ================================================== */
@@ -703,6 +704,17 @@ handle_cmdaccheck(CMD_Request *rx_message, CMD_Reply *tx_message)
 
 /* ================================================== */
 
+static int
+convert_addsrc_select_options(int flags)
+{
+    return (flags & REQ_ADDSRC_PREFER ? SRC_SELECT_PREFER : 0) |
+           (flags & REQ_ADDSRC_NOSELECT ? SRC_SELECT_NOSELECT : 0) |
+           (flags & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
+           (flags & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
+}
+
+/* ================================================== */
+
 static void
 handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
@@ -771,13 +783,11 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
   params.burst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_BURST ? 1 : 0;
   params.nts = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NTS ? 1 : 0;
   params.copy = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_COPY ? 1 : 0;
-  params.ext_fields =
-    ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_EF_EXP1 ? NTP_EF_FLAG_EXP1 : 0;
-  params.sel_options =
-    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_PREFER ? SRC_SELECT_PREFER : 0) |
-    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NOSELECT ? SRC_SELECT_NOSELECT : 0) |
-    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
-    (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
+  params.ext_fields = (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_EF_EXP_MONO_ROOT ?
+                      NTP_EF_FLAG_EXP_MONO_ROOT : 0) |
+                      (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_EF_EXP_NET_CORRECTION ?
+                      NTP_EF_FLAG_EXP_NET_CORRECTION : 0);
+  params.sel_options = convert_addsrc_select_options(ntohl(rx_message->data.ntp_source.flags));
 
   status = NSR_AddSourceByName(name, port, pool, type, &params, NULL);
   switch (status) {
@@ -1169,18 +1179,36 @@ handle_server_stats(CMD_Request *rx_message, CMD_Reply *tx_message)
   RPT_ServerStatsReport report;
 
   CLG_GetServerStatsReport(&report);
-  tx_message->reply = htons(RPY_SERVER_STATS3);
-  tx_message->data.server_stats.ntp_hits = htonl(report.ntp_hits);
-  tx_message->data.server_stats.nke_hits = htonl(report.nke_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.nke_drops = htonl(report.nke_drops);
-  tx_message->data.server_stats.cmd_drops = htonl(report.cmd_drops);
-  tx_message->data.server_stats.log_drops = htonl(report.log_drops);
-  tx_message->data.server_stats.ntp_auth_hits = htonl(report.ntp_auth_hits);
-  tx_message->data.server_stats.ntp_interleaved_hits = htonl(report.ntp_interleaved_hits);
-  tx_message->data.server_stats.ntp_timestamps = htonl(report.ntp_timestamps);
-  tx_message->data.server_stats.ntp_span_seconds = htonl(report.ntp_span_seconds);
+  tx_message->reply = htons(RPY_SERVER_STATS4);
+  tx_message->data.server_stats.ntp_hits = UTI_Integer64HostToNetwork(report.ntp_hits);
+  tx_message->data.server_stats.nke_hits = UTI_Integer64HostToNetwork(report.nke_hits);
+  tx_message->data.server_stats.cmd_hits = UTI_Integer64HostToNetwork(report.cmd_hits);
+  tx_message->data.server_stats.ntp_drops = UTI_Integer64HostToNetwork(report.ntp_drops);
+  tx_message->data.server_stats.nke_drops = UTI_Integer64HostToNetwork(report.nke_drops);
+  tx_message->data.server_stats.cmd_drops = UTI_Integer64HostToNetwork(report.cmd_drops);
+  tx_message->data.server_stats.log_drops = UTI_Integer64HostToNetwork(report.log_drops);
+  tx_message->data.server_stats.ntp_auth_hits =
+    UTI_Integer64HostToNetwork(report.ntp_auth_hits);
+  tx_message->data.server_stats.ntp_interleaved_hits =
+    UTI_Integer64HostToNetwork(report.ntp_interleaved_hits);
+  tx_message->data.server_stats.ntp_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_timestamps);
+  tx_message->data.server_stats.ntp_span_seconds =
+    UTI_Integer64HostToNetwork(report.ntp_span_seconds);
+  tx_message->data.server_stats.ntp_daemon_rx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_daemon_rx_timestamps);
+  tx_message->data.server_stats.ntp_daemon_tx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_daemon_tx_timestamps);
+  tx_message->data.server_stats.ntp_kernel_rx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_kernel_rx_timestamps);
+  tx_message->data.server_stats.ntp_kernel_tx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_kernel_tx_timestamps);
+  tx_message->data.server_stats.ntp_hw_rx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_hw_rx_timestamps);
+  tx_message->data.server_stats.ntp_hw_tx_timestamps =
+    UTI_Integer64HostToNetwork(report.ntp_hw_tx_timestamps);
+  memset(tx_message->data.server_stats.reserved, 0xff,
+         sizeof (tx_message->data.server_stats.reserved));
 }
 
 /* ================================================== */
@@ -1328,7 +1356,7 @@ handle_auth_data(CMD_Request *rx_message, CMD_Reply *tx_message)
 /* ================================================== */
 
 static uint16_t
-convert_select_options(int options)
+convert_sd_sel_options(int options)
 {
   return (options & SRC_SELECT_PREFER ? RPY_SD_OPTION_PREFER : 0) |
          (options & SRC_SELECT_NOSELECT ? RPY_SD_OPTION_NOSELECT : 0) |
@@ -1355,14 +1383,32 @@ handle_select_data(CMD_Request *rx_message, CMD_Reply *tx_message)
   tx_message->data.select_data.state_char = report.state_char;
   tx_message->data.select_data.authentication = report.authentication;
   tx_message->data.select_data.leap = report.leap;
-  tx_message->data.select_data.conf_options = htons(convert_select_options(report.conf_options));
-  tx_message->data.select_data.eff_options = htons(convert_select_options(report.eff_options));
+  tx_message->data.select_data.conf_options = htons(convert_sd_sel_options(report.conf_options));
+  tx_message->data.select_data.eff_options = htons(convert_sd_sel_options(report.eff_options));
   tx_message->data.select_data.last_sample_ago = htonl(report.last_sample_ago);
   tx_message->data.select_data.score = UTI_FloatHostToNetwork(report.score);
   tx_message->data.select_data.hi_limit = UTI_FloatHostToNetwork(report.hi_limit);
   tx_message->data.select_data.lo_limit = UTI_FloatHostToNetwork(report.lo_limit);
 }
 
+/* ================================================== */
+
+static void
+handle_modify_selectopts(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  int mask, options;
+  uint32_t ref_id;
+  IPAddr ip_addr;
+
+  UTI_IPNetworkToHost(&rx_message->data.modify_select_opts.address, &ip_addr);
+  ref_id = ntohl(rx_message->data.modify_select_opts.ref_id);
+  mask = ntohl(rx_message->data.modify_select_opts.mask);
+  options = convert_addsrc_select_options(ntohl(rx_message->data.modify_select_opts.options));
+
+  if (!SRC_ModifySelectOptions(&ip_addr, ref_id, options, mask))
+    tx_message->status = htons(STT_NOSUCHSOURCE);
+}
+
 /* ================================================== */
 /* Read a packet and process it */
 
@@ -1515,6 +1561,8 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
     }
 
     if (allowed) {
+      LOG_SetContext(LOGC_Command);
+
       switch(rx_command) {
         case REQ_NULL:
           /* Do nothing */
@@ -1757,11 +1805,17 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
           handle_reload_sources(&rx_message, &tx_message);
           break;
 
+        case REQ_MODIFY_SELECTOPTS:
+          handle_modify_selectopts(&rx_message, &tx_message);
+          break;
+
         default:
           DEBUG_LOG("Unhandled command %d", rx_command);
           tx_message.status = htons(STT_FAILED);
           break;
       }
+
+      LOG_UnsetContext(LOGC_Command);
     } else {
       tx_message.status = htons(STT_UNAUTH);
     }
@@ -1795,6 +1849,9 @@ CAM_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all)
   if (status == ADF_BADSUBNET) {
     return 0;
   } else if (status == ADF_SUCCESS) {
+    LOG(LOG_GetContextSeverity(LOGC_Command), "%s%s %s access from %s",
+        allow ? "Allowed" : "Denied", all ? " all" : "", "command",
+        UTI_IPSubnetToString(ip_addr, subnet_bits));
     return 1;
   } else {
     return 0;

cmdparse.c

@@ -44,7 +44,7 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 {
   char *hostname, *cmd;
   uint32_t ef_type;
-  int n;
+  int n, sel_option;
   
   src->port = SRC_DEFAULT_PORT;
   src->params.minpoll = SRC_DEFAULT_MINPOLL;
@@ -101,14 +101,6 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
       src->params.iburst = 1;
     } else if (!strcasecmp(cmd, "offline")) {
       src->params.connectivity = SRC_OFFLINE;
-    } else if (!strcasecmp(cmd, "noselect")) {
-      src->params.sel_options |= SRC_SELECT_NOSELECT;
-    } else if (!strcasecmp(cmd, "prefer")) {
-      src->params.sel_options |= SRC_SELECT_PREFER;
-    } else if (!strcasecmp(cmd, "require")) {
-      src->params.sel_options |= SRC_SELECT_REQUIRE;
-    } else if (!strcasecmp(cmd, "trust")) {
-      src->params.sel_options |= SRC_SELECT_TRUST;
     } else if (!strcasecmp(cmd, "certset")) {
       if (sscanf(line, "%"SCNu32"%n", &src->params.cert_set, &n) != 1)
         return 0;
@@ -123,8 +115,11 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
       if (sscanf(line, "%"SCNx32"%n", &ef_type, &n) != 1)
         return 0;
       switch (ef_type) {
-        case NTP_EF_EXP1:
-          src->params.ext_fields |= NTP_EF_FLAG_EXP1;
+        case NTP_EF_EXP_MONO_ROOT:
+          src->params.ext_fields |= NTP_EF_FLAG_EXP_MONO_ROOT;
+          break;
+        case NTP_EF_EXP_NET_CORRECTION:
+          src->params.ext_fields |= NTP_EF_FLAG_EXP_NET_CORRECTION;
           break;
         default:
           return 0;
@@ -187,6 +182,8 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
         return 0;
     } else if (!strcasecmp(cmd, "xleave")) {
       src->params.interleaved = 1;
+    } else if ((sel_option = CPS_GetSelectOption(cmd)) != 0) {
+      src->params.sel_options |= sel_option;
     } else {
       return 0;
     }
@@ -197,6 +194,23 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 
 /* ================================================== */
 
+int
+CPS_GetSelectOption(char *option)
+{
+  if (!strcasecmp(option, "noselect")) {
+    return SRC_SELECT_NOSELECT;
+  } else if (!strcasecmp(option, "prefer")) {
+    return SRC_SELECT_PREFER;
+  } else if (!strcasecmp(option, "require")) {
+    return SRC_SELECT_REQUIRE;
+  } else if (!strcasecmp(option, "trust")) {
+    return SRC_SELECT_TRUST;
+  }
+  return 0;
+}
+
+/* ================================================== */
+
 int
 CPS_ParseAllowDeny(char *line, int *all, IPAddr *ip, int *subnet_bits)
 {
@@ -396,3 +410,19 @@ CPS_ParseKey(char *line, uint32_t *id, const char **type, char **key)
 
   return 1;
 }
+
+/* ================================================== */
+
+int
+CPS_ParseRefid(char *line, uint32_t *ref_id)
+{
+  int i;
+
+  for (i = *ref_id = 0; line[i] && !isspace((unsigned char)line[i]); i++) {
+    if (i >= 4)
+      return 0;
+    *ref_id |= (uint32_t)line[i] << (24 - i * 8);
+  }
+
+  return i;
+}

cmdparse.h

@@ -39,6 +39,9 @@ typedef struct {
 /* Parse a command to add an NTP server or peer */
 extern int CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
   
+/* Get an NTP/refclock select option */
+extern int CPS_GetSelectOption(char *option);
+
 /* Parse a command to allow/deny access */
 extern int CPS_ParseAllowDeny(char *line, int *all, IPAddr *ip, int *subnet_bits);
 
@@ -54,4 +57,7 @@ extern char *CPS_SplitWord(char *line);
 /* Parse a key from keyfile */
 extern int CPS_ParseKey(char *line, uint32_t *id, const char **type, char **key);
 
+/* Parse a refclock reference ID (returns number of characters) */
+extern int CPS_ParseRefid(char *line, uint32_t *ref_id);
+
 #endif /* GOT_CMDPARSE_H */

conf.c

@@ -252,6 +252,9 @@ static char *leapsec_tz = NULL;
 /* Name of the user to which will be dropped root privileges. */
 static char *user;
 
+/* Address refresh interval */
+static int refresh = 1209600; /* 2 weeks */
+
 /* NTS server and client configuration */
 static char *nts_dump_dir = NULL;
 static char *nts_ntp_server = NULL;
@@ -274,6 +277,9 @@ static int no_system_cert = 0;
 /* Array of CNF_HwTsInterface */
 static ARR_Instance hwts_interfaces;
 
+/* Timeout for resuming reading from sockets waiting for HW TX timestamp */
+static double hwts_timeout = 0.001;
+
 /* PTP event port (disabled by default) */
 static int ptp_port = 0;
 
@@ -602,6 +608,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_string(p, &hwclock_file);
   } else if (!strcasecmp(command, "hwtimestamp")) {
     parse_hwtimestamp(p);
+  } else if (!strcasecmp(command, "hwtstimeout")) {
+    parse_double(p, &hwts_timeout);
   } else if (!strcasecmp(command, "include")) {
     parse_include(p);
   } else if (!strcasecmp(command, "initstepslew")) {
@@ -697,6 +705,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
                     &ntp_ratelimit_burst, &ntp_ratelimit_leak);
   } else if (!strcasecmp(command, "refclock")) {
     parse_refclock(p);
+  } else if (!strcasecmp(command, "refresh")) {
+    parse_int(p, &refresh);
   } else if (!strcasecmp(command, "reselectdist")) {
     parse_double(p, &reselect_distance);
   } else if (!strcasecmp(command, "rtcautotrim")) {
@@ -862,11 +872,10 @@ static void
 parse_refclock(char *line)
 {
   int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
-  int local, max_lock_age, pps_forced, stratum, tai;
+  int local, max_lock_age, pps_forced, sel_option, stratum, tai;
   uint32_t ref_id, lock_ref_id;
   double offset, delay, precision, max_dispersion, pulse_width;
   char *p, *cmd, *name, *param;
-  unsigned char ref[5];
   RefclockParameters *refclock;
 
   poll = 4;
@@ -912,13 +921,11 @@ parse_refclock(char *line)
     line = CPS_SplitWord(line);
 
     if (!strcasecmp(cmd, "refid")) {
-      if (sscanf(line, "%4s%n", (char *)ref, &n) != 1)
+      if ((n = CPS_ParseRefid(line, &ref_id)) == 0)
         break;
-      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)
+      if ((n = CPS_ParseRefid(line, &lock_ref_id)) == 0)
         break;
-      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;
@@ -971,18 +978,9 @@ parse_refclock(char *line)
     } else if (!strcasecmp(cmd, "width")) {
       if (sscanf(line, "%lf%n", &pulse_width, &n) != 1)
         break;
-    } else if (!strcasecmp(cmd, "noselect")) {
+    } else if ((sel_option = CPS_GetSelectOption(cmd)) != 0) {
       n = 0;
-      sel_options |= SRC_SELECT_NOSELECT;
-    } else if (!strcasecmp(cmd, "prefer")) {
-      n = 0;
-      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;
+      sel_options |= sel_option;
     } else {
       other_parse_error("Invalid refclock option");
       return;
@@ -1437,8 +1435,8 @@ static void
 parse_hwtimestamp(char *line)
 {
   CNF_HwTsInterface *iface;
+  int n, maxpoll_set = 0;
   char *p, filter[5];
-  int n;
 
   if (!*line) {
     command_parse_error();
@@ -1468,6 +1466,10 @@ parse_hwtimestamp(char *line)
     } else if (!strcasecmp(p, "minpoll")) {
       if (sscanf(line, "%d%n", &iface->minpoll, &n) != 1)
         break;
+    } else if (!strcasecmp(p, "maxpoll")) {
+      if (sscanf(line, "%d%n", &iface->maxpoll, &n) != 1)
+        break;
+      maxpoll_set = 1;
     } else if (!strcasecmp(p, "minsamples")) {
       if (sscanf(line, "%d%n", &iface->min_samples, &n) != 1)
         break;
@@ -1503,6 +1505,9 @@ parse_hwtimestamp(char *line)
 
   if (*p)
     command_parse_error();
+
+  if (!maxpoll_set)
+    iface->maxpoll = iface->minpoll + 1;
 }
 
 /* ================================================== */
@@ -1655,11 +1660,11 @@ compare_sources(const void *a, const void *b)
     return 1;
   if ((d = strcmp(sa->params.name, sb->params.name)) != 0)
     return d;
-  if ((d = (int)(sa->type) - (int)(sb->type)) != 0)
+  if ((d = (int)sa->type - (int)sb->type) != 0)
     return d;
-  if ((d = sa->pool - sb->pool) != 0)
+  if ((d = (int)sa->pool - (int)sb->pool) != 0)
     return d;
-  if ((d = sa->params.port - sb->params.port) != 0)
+  if ((d = (int)sa->params.port - (int)sb->params.port) != 0)
     return d;
   return memcmp(&sa->params.params, &sb->params.params, sizeof (sa->params.params));
 }
@@ -1674,7 +1679,7 @@ reload_source_dirs(void)
   uint32_t *prev_ids, *new_ids;
   char buf[MAX_LINE_LENGTH];
   NSR_Status s;
-  int d;
+  int d, pass;
 
   prev_size = ARR_GetSize(ntp_source_ids);
   if (prev_size > 0 && ARR_GetSize(ntp_sources) != prev_size)
@@ -1704,41 +1709,47 @@ reload_source_dirs(void)
   new_ids = ARR_GetElements(ntp_source_ids);
   unresolved = 0;
 
+  LOG_SetContext(LOGC_SourceFile);
+
   qsort(new_sources, new_size, sizeof (new_sources[0]), compare_sources);
 
-  for (i = j = 0; i < prev_size || j < new_size; ) {
-    if (i < prev_size && j < new_size)
-      d = compare_sources(&prev_sources[i], &new_sources[j]);
-    else
-      d = i < prev_size ? -1 : 1;
+  for (pass = 0; pass < 2; pass++) {
+    for (i = j = 0; i < prev_size || j < new_size; i += d <= 0, j += d >= 0) {
+      if (i < prev_size && j < new_size)
+        d = compare_sources(&prev_sources[i], &new_sources[j]);
+      else
+        d = i < prev_size ? -1 : 1;
 
-    if (d < 0) {
-      /* Remove the missing source */
-      if (prev_sources[i].params.name[0] != '\0')
+      /* Remove missing sources before adding others to avoid conflicts */
+      if (pass == 0 && d < 0 && prev_sources[i].params.name[0] != '\0') {
         NSR_RemoveSourcesById(prev_ids[i]);
-      i++;
-    } else if (d > 0) {
-      /* Add a newly configured source */
-      source = &new_sources[j];
-      s = NSR_AddSourceByName(source->params.name, source->params.port, source->pool,
-                              source->type, &source->params.params, &new_ids[j]);
-
-      if (s == NSR_UnresolvedName) {
-        unresolved++;
-      } else if (s != NSR_Success) {
-        LOG(LOGS_ERR, "Could not add source %s", source->params.name);
-
-        /* Mark the source as not present */
-        source->params.name[0] = '\0';
       }
-      j++;
-    } else {
-      /* Keep the existing source */
-      new_ids[j] = prev_ids[i];
-      i++, j++;
+
+      /* Add new sources */
+      if (pass == 1 && d > 0) {
+        source = &new_sources[j];
+        s = NSR_AddSourceByName(source->params.name, source->params.port, source->pool,
+                                source->type, &source->params.params, &new_ids[j]);
+
+        if (s == NSR_UnresolvedName) {
+          unresolved++;
+        } else if (s != NSR_Success) {
+          LOG(LOGS_ERR, "Could not add source %s : %s",
+              source->params.name, NSR_StatusToString(s));
+
+          /* Mark the source as not present */
+          source->params.name[0] = '\0';
+        }
+      }
+
+      /* Keep unchanged sources */
+      if (pass == 1 && d == 0)
+        new_ids[j] = prev_ids[i];
     }
   }
 
+  LOG_UnsetContext(LOGC_SourceFile);
+
   for (i = 0; i < prev_size; i++)
     Free(prev_sources[i].params.name);
   Free(prev_sources);
@@ -1782,6 +1793,19 @@ CNF_CreateDirs(uid_t uid, gid_t gid)
 
 /* ================================================== */
 
+void
+CNF_CheckReadOnlyAccess(void)
+{
+  unsigned int i;
+
+  if (keys_file)
+    UTI_CheckReadOnlyAccess(keys_file);
+  for (i = 0; i < ARR_GetSize(nts_server_key_files); i++)
+    UTI_CheckReadOnlyAccess(*(char **)ARR_GetElement(nts_server_key_files, i));
+}
+
+/* ================================================== */
+
 void
 CNF_AddInitSources(void)
 {
@@ -2500,6 +2524,14 @@ CNF_GetHwTsInterface(unsigned int index, CNF_HwTsInterface **iface)
 
 /* ================================================== */
 
+double
+CNF_GetHwTsTimeout(void)
+{
+  return hwts_timeout;
+}
+
+/* ================================================== */
+
 int
 CNF_GetPtpPort(void)
 {
@@ -2508,6 +2540,14 @@ CNF_GetPtpPort(void)
 
 /* ================================================== */
 
+int
+CNF_GetRefresh(void)
+{
+  return refresh;
+}
+
+/* ================================================== */
+
 char *
 CNF_GetNtsDumpDir(void)
 {

conf.h

@@ -44,6 +44,8 @@ extern void CNF_ParseLine(const char *filename, int number, char *line);
 
 extern void CNF_CreateDirs(uid_t uid, gid_t gid);
 
+extern void CNF_CheckReadOnlyAccess(void);
+
 extern void CNF_AddInitSources(void);
 extern void CNF_AddSources(void);
 extern void CNF_AddBroadcasts(void);
@@ -142,6 +144,7 @@ typedef enum {
 typedef struct {
   char *name;
   int minpoll;
+  int maxpoll;
   int min_samples;
   int max_samples;
   int nocrossts;
@@ -152,9 +155,12 @@ typedef struct {
 } CNF_HwTsInterface;
 
 extern int CNF_GetHwTsInterface(unsigned int index, CNF_HwTsInterface **iface);
+extern double CNF_GetHwTsTimeout(void);
 
 extern int CNF_GetPtpPort(void);
 
+extern int CNF_GetRefresh(void);
+
 extern char *CNF_GetNtsDumpDir(void);
 extern char *CNF_GetNtsNtpServer(void);
 extern int CNF_GetNtsServerCertAndKeyFiles(const char ***certs, const char ***keys);

configure

@@ -5,7 +5,7 @@
 #
 # Copyright (C) Richard P. Curnow  1997-2003
 # Copyright (C) Bryan Christianson  2016
-# Copyright (C) Miroslav Lichvar  2009, 2012-2021
+# Copyright (C) Miroslav Lichvar  2009, 2012-2022
 # Copyright (C) Stefan R. Filipek  2019
 #
 # =======================================================================
@@ -111,10 +111,10 @@ For better control, use the options below.
   --without-editline     Don't use editline even if it is available
   --disable-sechash      Disable support for hashes other than MD5
   --without-nettle       Don't use nettle even if it is available
+  --without-gnutls       Don't use gnutls even if it is available
   --without-nss          Don't use NSS even if it is available
   --without-tomcrypt     Don't use libtomcrypt even if it is available
   --disable-nts          Disable NTS support
-  --without-gnutls       Don't use gnutls even if it is available
   --disable-cmdmon       Disable command and monitoring support
   --disable-ntp          Disable NTP support
   --disable-refclock     Disable reference clock support
@@ -128,6 +128,7 @@ For better control, use the options below.
   --without-seccomp      Don't use seccomp even if it is available
   --disable-asyncdns     Disable asynchronous name resolving
   --disable-forcednsretry Don't retry on permanent DNS error
+  --without-aes-gcm-siv  Don't use AES-GCM-SIV for NTS even if it is available
   --without-clock-gettime Don't use clock_gettime() even if it is available
   --disable-timestamping Disable support for SW/HW timestamping
   --enable-ntp-signd     Enable support for MS-SNTP authentication in Samba
@@ -244,6 +245,7 @@ try_setsched=0
 try_lockmem=0
 feat_asyncdns=1
 feat_forcednsretry=1
+try_aes_gcm_siv=1
 try_clock_gettime=1
 try_arc4random=1
 try_recvmmsg=1
@@ -345,6 +347,9 @@ do
     --disable-forcednsretry)
       feat_forcednsretry=0
     ;;
+    --without-aes-gcm-siv)
+      try_aes_gcm_siv=0
+    ;;
     --without-clock-gettime)
       try_clock_gettime=0
     ;;
@@ -565,6 +570,13 @@ if [ "x$MYCFLAGS" = "x" ]; then
   fi
 fi
 
+TESTCFLAGS="-fwrapv"
+if test_code '-fwrapv' '' "$TESTCFLAGS" '' ''; then
+  GETDATE_CFLAGS="-fwrapv"
+else
+  GETDATE_CFLAGS=""
+fi
+
 if [ "x$MYCC" = "xgcc" ] || [ "x$MYCC" = "xclang" ]; then
   MYCFLAGS="$MYCFLAGS -Wmissing-prototypes -Wall"
 fi
@@ -914,6 +926,28 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nettle = "1" ];
   fi
 fi
 
+if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_gnutls = "1" ]; then
+  test_cflags="`pkg_config --cflags gnutls`"
+  test_link="`pkg_config --libs gnutls`"
+  if test_code 'gnutls' 'gnutls/crypto.h' \
+    "$test_cflags" "$test_link" '
+      return gnutls_hash((void *)1, (void *)2, 1);'
+  then
+    HASH_OBJ="hash_gnutls.o"
+    HASH_LINK="$test_link"
+    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
+    add_def FEAT_SECHASH
+
+    if test_code 'CMAC in gnutls' 'gnutls/crypto.h' "$test_cflags" "$test_link" \
+      'return gnutls_hmac_init((void *)1, GNUTLS_MAC_AES_CMAC_128, (void *)2, 0);'
+    then
+      add_def HAVE_CMAC
+      EXTRA_OBJECTS="$EXTRA_OBJECTS cmac_gnutls.o"
+      EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS cmac_gnutls.o"
+    fi
+  fi
+fi
+
 if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nss = "1" ]; then
   test_cflags="`pkg_config --cflags nss`"
   test_link="`pkg_config --libs-only-L nss` -lfreebl3 -lnssutil3"
@@ -939,28 +973,6 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]
   fi
 fi
 
-if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_gnutls = "1" ]; then
-  test_cflags="`pkg_config --cflags gnutls`"
-  test_link="`pkg_config --libs gnutls`"
-  if test_code 'gnutls' 'gnutls/crypto.h' \
-    "$test_cflags" "$test_link" '
-      return gnutls_hash((void *)1, (void *)2, 1);'
-  then
-    HASH_OBJ="hash_gnutls.o"
-    HASH_LINK="$test_link"
-    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
-    add_def FEAT_SECHASH
-
-    if test_code 'CMAC in gnutls' 'gnutls/crypto.h' "$test_cflags" "$test_link" \
-      'return gnutls_hmac_init((void *)1, GNUTLS_MAC_AES_CMAC_128, (void *)2, 0);'
-    then
-      add_def HAVE_CMAC
-      EXTRA_OBJECTS="$EXTRA_OBJECTS cmac_gnutls.o"
-      EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS cmac_gnutls.o"
-    fi
-  fi
-fi
-
 EXTRA_OBJECTS="$EXTRA_OBJECTS $HASH_OBJ"
 EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS $HASH_OBJ"
 LIBS="$LIBS $HASH_LINK"
@@ -979,20 +991,34 @@ if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
         gnutls_priority_init2((void *)1, "", NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND) +
         gnutls_prf_rfc5705((void *)1, 0, "", 0, "", 16, (void *)2);'
   then
-    if test_code 'SIV in nettle' \
+    if [ $try_nettle = "1" ] && test_code 'AES-SIV-CMAC in nettle' \
       'nettle/siv-cmac.h' "" "$LIBS" \
       'siv_cmac_aes128_set_key((void *)1, (void *)2);'
     then
       EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
       add_def HAVE_SIV
       add_def HAVE_NETTLE_SIV_CMAC
+      if [ $try_aes_gcm_siv = "1" ] && test_code 'AES-GCM-SIV in nettle' \
+        'nettle/siv-gcm.h' "" "$LIBS" \
+        'siv_gcm_aes128_encrypt_message((void *)1, 0, NULL, 0, (void *)2, 16, (void *)3,
+                                        (void *)4);'
+      then
+        add_def HAVE_NETTLE_SIV_GCM
+      fi
     else
-      if test_code 'SIV in gnutls' 'gnutls/crypto.h' \
+      if test_code 'AES-SIV-CMAC in gnutls' 'gnutls/crypto.h' \
         "$test_cflags" "$test_link $LIBS" '
           return gnutls_aead_cipher_init((void *)1, GNUTLS_CIPHER_AES_128_SIV, (void *)2);'
       then
         EXTRA_OBJECTS="$EXTRA_OBJECTS siv_gnutls.o"
         add_def HAVE_SIV
+        if [ $try_aes_gcm_siv = "1" ] && test_code 'AES-GCM-SIV in gnutls' \
+          'gnutls/crypto.h' "$test_cflags" "$test_link $LIBS" '
+            return gnutls_aead_cipher_init((void *)1, GNUTLS_CIPHER_AES_128_SIV_GCM,
+                                           (void *)2);'
+        then
+          add_def HAVE_GNUTLS_SIV_GCM
+        fi
         if test_code 'gnutls_aead_cipher_set_key()' 'gnutls/crypto.h' \
           "$test_cflags" "$test_link $LIBS" '
             return gnutls_aead_cipher_set_key((void *)1, (void *)2);'
@@ -1110,6 +1136,7 @@ do
           s%@CFLAGS@%${MYCFLAGS}%;\
           s%@CPPFLAGS@%${MYCPPFLAGS}%;\
           s%@LDFLAGS@%${MYLDFLAGS}%;\
+          s%@GETDATE_CFLAGS@%${GETDATE_CFLAGS}%;\
           s%@LIBS@%${LIBS}%;\
           s%@EXTRA_LIBS@%${EXTRA_LIBS}%;\
           s%@EXTRA_CLI_LIBS@%${EXTRA_CLI_LIBS}%;\

contrib/bryan_christianson_1/README.txt

@@ -60,8 +60,8 @@ Support files
 Dates and sizes may differ
 -rw-r--r--  1 yourname  staff  2084  4 Aug 22:54 README.txt
 -rwxr-xr-x  1 yourname  staff   676  4 Aug 21:18 chronylogrotate.sh
--rw-r--r--  1 yourname  staff   543 18 Jul 20:10 org.tuxfamily.chronyc.plist
--rw-r--r--  1 yourname  staff   511 19 Jun 18:30 org.tuxfamily.chronyd.plist
+-rw-r--r--  1 yourname  staff   543 18 Jul 20:10 org.chrony-project.chronyc.plist
+-rw-r--r--  1 yourname  staff   511 19 Jun 18:30 org.chrony-project.chronyd.plist
 
 If you have used chrony support directories other than those suggested, you
 will need to edit each file and make the appropriate changes.
@@ -83,21 +83,21 @@ sudo chmod +x /usr/local/bin/chronylogrotate.sh
 sudo chown root:wheel /usr/local/bin/chronylogrotate.sh
 
 
-2. org.tuxfamily.chronyc.plist
+2. org.chrony-project.chronyc.plist
 This file is the launchd plist that runs logrotation each day. You may
 wish to edit this file to change the time of day at which the rotation
 will run, currently 04:05 am
 
-sudo cp org.tuxfamily.chronyc.plist /Library/LaunchDaemons
-sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
-sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
-sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
+sudo cp org.chrony-project.chronyc.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.chrony-project.chronyc.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.chrony-project.chronyc.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.chrony-project.chronyc.plist
 
 
-3. org.tuxfamily.chronyd.plist
+3. org.chrony-project.chronyd.plist
 This file is the launchd plist that runs chronyd when the Macintosh starts.
 
-sudo cp org.tuxfamily.chronyd.plist /Library/LaunchDaemons
-sudo chown root:wheel /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
-sudo chmod 0644 /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
-sudo launchctl load -w /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
+sudo cp org.chrony-project.chronyd.plist /Library/LaunchDaemons
+sudo chown root:wheel /Library/LaunchDaemons/org.chrony-project.chronyd.plist
+sudo chmod 0644 /Library/LaunchDaemons/org.chrony-project.chronyd.plist
+sudo launchctl load -w /Library/LaunchDaemons/org.chrony-project.chronyd.plist

contrib/bryan_christianson_1/org.chrony-project.chronyc.plist

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>Label</key>
-	<string>org.tuxfamily.logrotate</string>
+	<string>org.chrony-project.logrotate</string>
 	<key>KeepAlive</key>
 	<false/>
 	<key>ProgramArguments</key>

contrib/bryan_christianson_1/org.chrony-project.chronyd.plist

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>Label</key>
-	<string>org.tuxfamily.chronyd</string>
+	<string>org.chrony-project.chronyd</string>
 	<key>Program</key>
 	<string>/usr/local/sbin/chronyd</string>
 	<key>ProgramArguments</key>

doc/chrony.conf.adoc

@@ -3,7 +3,7 @@
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Stephen Wadeley  2016
 // Copyright (C) Bryan Christianson  2017
-// Copyright (C) Miroslav Lichvar  2009-2022
+// Copyright (C) Miroslav Lichvar  2009-2023
 //
 // 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
@@ -72,9 +72,7 @@ newly resolved address when the server becomes unreachable (i.e. no valid
 response to last 8 requests), unsynchronised, a falseticker (i.e. does not
 agree with a majority of other sources), or the root distance is too large (the
 limit can be configured by the <<maxdistance,*maxdistance*>> directive). The
-automatic replacement happens at most once per 30 minutes. It can also be
-triggered manually for all sources by the <<chronyc.adoc#refresh,*refresh*>>
-command in *chronyc*.
+automatic replacement happens at most once per 30 minutes.
 +
 This directive can be used multiple times to specify multiple servers.
 +
@@ -324,16 +322,27 @@ server implementations do not respond to requests containing an unknown
 extension field (*chronyd* as a server responded to such requests since
 version 2.0).
 +
-The following extension field can be enabled by this option:
+This option can be used multiple times to enable multiple extension fields.
++
+The following extension fields are supported:
 +
 _F323_::::
-This is an experimental extension field for some improvements that were
+An experimental extension field to enable several improvements that were
 proposed for the next version of the NTP protocol (NTPv5). The field contains
 root delay and dispersion in higher resolution and a monotonic receive
-timestamp, which enables a frequency transfer between the server and client. It
-can significantly improve stability of the synchronization. Generally, it
-should be expected to work only between servers and clients running the same
-version of *chronyd*.
+timestamp, which enables a frequency transfer between the server and client to
+significantly improve stability of the synchronisation. This field should be
+enabled only for servers known to be running *chronyd* version 4.2 or later.
+_F324_::::
+An experimental extension field to enable the use of the Precision Time
+Protocol (PTP) correction field in NTP-over-PTP messages updated by one-step
+end-to-end transparent clocks in network switches and routers to significantly
+improve accuracy and stability of the synchronisation. NTP-over-PTP can be
+enabled by the <<ptpport,*ptpport*>> directive and setting the *port* option to
+the PTP port. The corrections are applied only to NTP measurements with HW
+timestamps (enabled by the <<hwtimestamp,*hwtimestamp*>> directive). This
+field should be enabled only for servers known to be running *chronyd* version
+4.5 or later.
 {blank}:::
 
 [[pool]]*pool* _name_ [_option_]...::
@@ -420,7 +429,7 @@ error. *chronyd* then enters its normal operating mode.
 An example of the use of the directive is:
 +
 ----
-initstepslew 30 foo.example.net bar.example.net baz.example.net
+initstepslew 30 ntp1.example.net ntp2.example.net ntp3.example.net
 ----
 +
 where 3 NTP servers are used to make the measurement. The _30_ indicates that
@@ -473,16 +482,41 @@ instead.
 Examples:
 +
 ----
-refclock PPS /dev/pps0 lock NMEA refid GPS
-refclock SHM 0 offset 0.5 delay 0.2 refid NMEA noselect
+refclock PPS /dev/pps0 lock NMEA refid GPS1
+refclock SOCK /var/run/chrony.clk.ttyS0.sock offset 0.5 delay 0.2 refid NMEA noselect
 refclock PPS /dev/pps1:clear refid GPS2
 ----
 +
+*SOCK*:::
+Unix domain socket driver. This driver uses a datagram socket to receive
+samples from another application running on the system. The parameter is the
+path to the socket, which *chronyd* will create on start. The format of the
+messages is described in the _refclock_sock.c_ file in the chrony source code.
++
+An application which supports the SOCK protocol is the *gpsd* daemon. It can
+provide accurate measurements using the receiver's PPS signal, and since
+version 3.25 also (much less accurate) measurements based on the timing of
+serial data (e.g. NMEA), which can be useful when the receiver does not provide
+a PPS signal, or it cannot be connected to the computer. The paths where *gpsd*
+expects the sockets to be created by *chronyd* are described in the *gpsd(8)*
+man page. Note that *gpsd* needs to be started after *chronyd* in order to
+connect to the socket.
++
+Examples:
++
+----
+refclock SOCK /var/run/chrony.ttyS0.sock refid GPS1 poll 2 filter 4
+refclock SOCK /var/run/chrony.clk.ttyUSB0.sock refid GPS2 offset 0.2 delay 0.1
+----
++
 *SHM*:::
-NTP shared memory driver. This driver uses a shared memory segment to receive
-samples from another process (e.g. *gpsd*). The parameter is the number of the
-shared memory segment, typically a small number like 0, 1, 2, or 3. The driver
-supports the following option:
+NTP shared memory driver. This driver implements the protocol of the *ntpd*
+driver type 28. It is functionally similar to the SOCK driver, but uses a
+shared memory segment instead of a socket. The parameter is the unit number,
+typically a small number like 0, 1, 2, or 3, from which is derived the key of
+the memory segment as 0x4e545030 + unit.
++
+The driver supports the following option:
 +
 *perm*=_mode_::::
 This option specifies the permissions of the shared memory segment created by
@@ -490,6 +524,16 @@ This option specifies the permissions of the shared memory segment created by
 (read-write access for owner only).
 {blank}:::
 +
+Unlike with the SOCK driver, there is no prescribed order of starting *chronyd*
+and the program providing measurements. Both are expected to create the memory
+segment if it does not exist. *chronyd* will attach to an existing segment even
+if it has a different owner than root or different permissions than the
+permissions specified by the *perm* option. The segment needs to be created
+before untrusted applications or users can execute code to prevent an attacker
+from feeding *chronyd* with false measurements. The owner and permissions of
+the segment can be verified with the *ipcs -m* command. For this reason, the
+SHM driver is deprecated in favor of SOCK.
++
 Examples:
 +
 ----
@@ -497,23 +541,6 @@ refclock SHM 0 poll 3 refid GPS1
 refclock SHM 1:perm=0644 refid GPS2
 ----
 +
-*SOCK*:::
-Unix domain socket driver. It is similar to the SHM driver, but samples are
-received from a Unix domain socket instead of shared memory and the messages
-have a different format. The parameter is the path to the socket, which
-*chronyd* creates on start. An advantage over the SHM driver is that SOCK does
-not require polling and it can receive PPS samples with incomplete time. The
-format of the messages is described in the _refclock_sock.c_ file in the chrony
-source code.
-+
-An application which supports the SOCK protocol is the *gpsd* daemon. The path
-where *gpsd* expects the socket to be created is described in the *gpsd(8)* man
-page. For example:
-+
-----
-refclock SOCK /var/run/chrony.ttyS0.sock
-----
-+
 *PHC*:::
 PTP hardware clock (PHC) driver. The parameter is the path to the device of
 the PTP clock which should be used as a time source. If the clock is kept in
@@ -624,7 +651,9 @@ noise in the measurements. With each poll about 40 percent of the stored
 samples are discarded and one final sample is calculated as an average of the
 remaining samples. If the length is 4 or more, at least 4 samples have to be
 collected between polls. For lengths below 4, the filter has to be full. The
-default is 64.
+default is 64. With drivers that perform their own polling (PPS, PHC, SHM), the
+maximum value is adjusted to the number of driver polls per source poll, i.e.
+2^(_poll_ - _dpoll_).
 *prefer*:::
 Prefer this source over sources without the prefer option.
 *noselect*:::
@@ -809,11 +838,16 @@ This directory is used also by the <<ntsdumpdir2,NTS server>> to save keys.
 This directive specifies the maximum interval between NTS-KE handshakes (in
 seconds) in order to refresh the keys authenticating NTP packets. The default
 value is 2419200 (4 weeks) and the maximum value is 2^31-1 (68 years).
++
+The interval must be longer than polling intervals of all configured NTP
+sources using NTS, otherwise the source with a longer polling interval will
+refresh the keys on each poll and no NTP packets will be exchanged.
 
 [[ntstrustedcerts]]*ntstrustedcerts* [_set-ID_] _file_|_directory_::
-This directive specifies a file or directory containing certificates (in the
-PEM format) of trusted certificate authorities (CA) which can be used to
-verify certificates of NTS servers.
+This directive specifies a file or directory containing trusted certificates
+(in the PEM format) which are needed to verify certificates of NTS-KE servers,
+e.g. certificates of trusted certificate authorities (CA) or self-signed
+certificates of the servers.
 +
 The optional _set-ID_ argument is a number in the range 0 through 2^32-1, which
 selects the set of certificates where certificates from the specified file
@@ -833,10 +867,10 @@ they change (e.g. after a renewal).
 An example is:
 +
 ----
-ntstrustedcerts /etc/pki/nts/foo.crt
-ntstrustedcerts 1 /etc/pki/nts/bar.crt
-ntstrustedcerts 1 /etc/pki/nts/baz.crt
-ntstrustedcerts 2 /etc/pki/nts/qux.crt
+ntstrustedcerts /etc/pki/nts/ca1.example.net.crt
+ntstrustedcerts 1 /etc/pki/nts/ca2.example.net.crt
+ntstrustedcerts 1 /etc/pki/nts/ca3.example.net.crt
+ntstrustedcerts 2 /etc/pki/nts/ntp2.example.net.crt
 ----
 
 [[nosystemcert]]*nosystemcert*::
@@ -862,6 +896,19 @@ This would disable the time checks until the clock is updated for the first
 time, assuming the first update corrects the clock and later checks can work
 with correct time.
 
+[[refresh]]*refresh* _interval_::
+This directive specifies the interval (in seconds) between refreshing IP
+addresses of NTP sources specified by hostname. If the hostname no longer
+resolves to the currently used address, it will be replaced with one of the new
+addresses to avoid using a server which is no longer intended for service, even
+if it is still responding correctly and would not be replaced as unreachable.
+Only one source is refreshed at a time. The default value is 1209600 (2 weeks)
+and the maximum value is 2^31-1 (68 years). A value of 0 disables the periodic
+refreshment.
++
+The <<chronyc.adoc#refresh,*refresh*>> command can be used to refresh all
+sources immediately.
+
 === Source selection
 
 [[authselectmode]]*authselectmode* _mode_::
@@ -920,20 +967,20 @@ before 4.0.
 As an example, the following configuration using the default *mix* mode:
 +
 ----
-server foo.example.net nts
-server bar.example.net nts
-server baz.example.net
-refclock SHM 0
+server ntp1.example.net nts
+server ntp2.example.net nts
+server ntp3.example.net
+refclock SOCK /var/run/chrony.ttyS0.sock
 ----
 +
 is equivalent to the following configuration using the *ignore* mode:
 +
 ----
 authselectmode ignore
-server foo.example.net nts require trust
-server bar.example.net nts require trust
-server baz.example.net
-refclock SHM 0 require trust
+server ntp1.example.net nts require trust
+server ntp2.example.net nts require trust
+server ntp3.example.net
+refclock /var/run/chrony.ttyS0.sock require trust
 ----
 
 [[combinelimit]]*combinelimit* _limit_::
@@ -1302,10 +1349,9 @@ It should be noted that this is not the only means of protection against using
 unreliable estimates. At all times, *chronyd* keeps track of both the estimated
 gain or loss rate, and the error bound on the estimate. When a new estimate is
 generated following another measurement from one of the sources, a weighted
-combination algorithm is used to update the master estimate. So if *chronyd*
-has an existing highly-reliable master estimate and a new estimate is generated
-which has large error bounds, the existing master estimate will dominate in the
-new master estimate.
+combination algorithm is used to update the existing estimate. If it has
+significantly smaller error bounds than the new estimate, the existing estimate
+will dominate in the new combined value.
 
 [[maxslewrate]]*maxslewrate* _rate-in-ppm_::
 The *maxslewrate* directive sets the maximum rate at which *chronyd* is allowed
@@ -1735,7 +1781,10 @@ save the keys to the _ntskeys_ file and will reload the keys from the file when
 the <<chronyc.adoc#rekey,*rekey*>> command is issued in *chronyc*. The file can
 be periodically copied from another server running *chronyd* (which does
 not have *ntsrotate* set to 0) in order to have one or more servers dedicated
-to NTS-KE. The NTS-KE servers need to be configured with the
+to NTS-KE. The file includes the subsequent key to which the NTS-KE server will
+switch on the next rotation, i.e. the process copying and reloading the file
+does not need to be timed precisely (it can be delayed by up to one rotation
+interval). The NTS-KE servers need to be configured with the
 <<ntsntpserver,*ntsntpserver*>> directive to point the clients to the right NTP
 server.
 +
@@ -1939,8 +1988,9 @@ all* directive.
 [[cmdport]]*cmdport* _port_::
 The *cmdport* directive allows the port that is used for run-time monitoring
 (via the *chronyc* program) to be altered from its default (323). If set to 0,
-*chronyd* will not open the port, this is useful to disable *chronyc*
-access from the Internet. (It does not disable the Unix domain command socket.)
+*chronyd* will not open the port, which disables remote *chronyc* access (with
+a non-default *bindcmdaddress*) and local access for unprivileged users. It
+does not disable the Unix domain command socket.
 +
 An example shows the syntax:
 +
@@ -1949,7 +1999,7 @@ cmdport 257
 ----
 +
 This would make *chronyd* use UDP 257 as its command port. (*chronyc* would
-need to be run with the *-p 257* switch to inter-operate correctly.)
+need to be run with the *-p 257* option to inter-operate correctly.)
 
 [[cmdratelimit]]*cmdratelimit* [_option_]...::
 This directive enables response rate limiting for command packets. It is
@@ -2218,6 +2268,13 @@ Used for synchronisation of the local clock:
 * _+_ - combined with the best source.
 * _*_ - selected as the best source to update the reference data (e.g. root
         delay, root dispersion).
+. Current effective selection options of the source. which can be different
+  from the configured options due to the authentication selection mode
+  (configured by the <<authselectmode,*authselectmode*>> directive). [-----]
+* _N_ indicates the *noselect* option.
+* _P_ indicates the *prefer* option.
+* _T_ indicates the *trust* option.
+* _R_ indicates the *require* option.
 . Reachability register printed as an octal number. The register has 8 bits and
   is updated on every received or missed packet from the source. A value of 377
   indicates that a valid reply was received for all from the last eight
@@ -2503,10 +2560,13 @@ physical clock created by writing to _/sys/class/ptp/ptpX/n_vclocks_. This
 feature is available on Linux 5.14 and newer.
 +
 If the kernel supports software timestamping, it will be enabled for all
-interfaces. The source of timestamps (i.e. hardware, kernel, or daemon) is
-indicated in the _measurements.log_ file if enabled by the <<log,*log
-measurements*>> directive, and the <<chronyc.adoc#ntpdata,*ntpdata*>> report in
-*chronyc*.
+interfaces automatically.
++
+The source of timestamps (i.e. hardware, kernel, or daemon) is indicated on the
+client side in the _measurements.log_ file (if enabled by the <<log,*log*>>
+directive) and the <<chronyc.adoc#ntpdata,*ntpdata*>> report. On the server
+side, the number of served timestamps from each source is provided in the
+<<chronyc.adoc#serverstats,*serverstats*>> report.
 +
 This directive can be used multiple times to enable HW timestamping on multiple
 interfaces. If the specified interface is _*_, *chronyd* will try to enable HW
@@ -2516,10 +2576,15 @@ The *hwtimestamp* directive has the following options:
 +
 *minpoll* _poll_:::
 This option specifies the minimum interval between readings of the NIC clock.
-It's defined as a power of two. It should correspond to the minimum polling
+It's defined as a power of 2. It should correspond to the minimum polling
 interval of all NTP sources and the minimum expected polling interval of NTP
-clients. The default value is 0 (1 second) and the minimum value is -6 (1/64th
-of a second).
+clients. The default value is 0 (1 second), the minimum value is -6 (1/64th
+of a second), and the maximum value is 20 (about 12 days).
+*maxpoll* _poll_:::
+This option specifies the maximum interval between readings of the NIC clock,
+as a power of 2. The default value is *minpoll* + 1, i.e. 1 (2 seconds) with
+the default *minpoll* of 0. The minimum and maximum values are the same as with
+the *minpoll* option.
 *minsamples* _samples_:::
 This option specifies the minimum number of readings kept for tracking of the
 NIC clock. The default value is 2.
@@ -2572,6 +2637,27 @@ hwtimestamp eth1 txcomp 300e-9 rxcomp 645e-9
 hwtimestamp *
 ----
 
+[[hwtstimeout]]*hwtstimeout* _timeout_::
+If hardware timestamping is used with a close NTP server, or the NIC or its
+driver is slow in providing the transmit timestamp of NTP requests, a response
+from the server can be received before the transmit timestamp of the request.
+To avoid calculating the offset with a less accurate transmit timestamp,
+*chronyd* can save the response for later processing and wait for the hardware
+transmit timestamp. There is no guarantee that the timestamp will be provided
+(NICs typically have a limited rate of transmit timestamping). This directive
+configures how long should *chronyd* wait for the timestamp after receiving a
+valid response from the server. If a second valid response is received from the
+server while waiting for the timestamp, they will be both processed
+immediately.
++
+The default value is 0.001 seconds, which should be sufficient with most
+hardware. If you frequently see kernel transmit timestamps in the
+_measurements.log_ file or <<chronyc.adoc#ntpdata,*ntpdata*>> report, and it is
+not a server handling a high rate of requests in the interleaved mode on the
+same interface (which would compete with timestamping of the server's own
+requests), increasing the timeout to 0.01 or possibly even longer might help.
+Note that the maximum timeout is limited by the NTP polling interval.
+
 [[keyfile]]*keyfile* _file_::
 This directive is used to specify the location of the file containing symmetric
 keys which are shared between NTP servers and clients, or peers, in order to
@@ -2655,24 +2741,27 @@ pidfile /run/chronyd.pid
 The *ptpport* directive enables *chronyd* to send and receive NTP messages
 contained in PTP event messages (NTP-over-PTP) to enable hardware timestamping
 on NICs which cannot timestamp NTP packets, but can timestamp unicast PTP
-packets. The port recognized by the NICs is 319 (PTP event port). The default
-value is 0 (disabled).
+packets, and also use corrections provided by PTP one-step end-to-end
+transparent clocks in network switches and routers. The port recognized by the
+NICs and PTP transparent clocks is 319 (PTP event port). The default value is 0
+(disabled).
 +
 The NTP-over-PTP support is experimental. The protocol and configuration can
-change in future. It should be used only in local networks and expected to work
-only between servers and clients running the same version of *chronyd*.
+change in future. It should be used only in local networks.
 +
 The PTP port will be open even if *chronyd* is not configured to operate as a
 server or client. The directive does not change the default protocol of
 specified NTP sources. Each NTP source that should use NTP-over-PTP needs to
 be specified with the *port* option set to the PTP port. To actually enable
 hardware timestamping on NICs which can timestamp PTP packets only, the
-*rxfilter* option of the *hwtimestamp* directive needs to be set to _ptp_.
+*rxfilter* option of the *hwtimestamp* directive needs to be set to _ptp_. The
+extension field _F324_ needs to be enabled to use the corrections provided by
+the PTP transparent clocks.
 +
 An example of client configuration is:
 +
 ----
-server foo.example.net minpoll 0 maxpoll 0 xleave port 319
+server ntp1.example.net minpoll 0 maxpoll 0 xleave port 319 extfield F324
 hwtimestamp * rxfilter ptp
 ptpport 319
 ----
@@ -2733,13 +2822,13 @@ the following methods:
   facilities.
 * Use public servers from the https://www.pool.ntp.org/[pool.ntp.org] project.
 
-Assuming that your NTP servers are called _foo.example.net_, _bar.example.net_
-and _baz.example.net_, your _chrony.conf_ file could contain as a minimum:
+Assuming that your NTP servers are called _ntp1.example.net_, _ntp2.example.net_
+and _ntp3.example.net_, your _chrony.conf_ file could contain as a minimum:
 
 ----
-server foo.example.net
-server bar.example.net
-server baz.example.net
+server ntp1.example.net
+server ntp2.example.net
+server ntp3.example.net
 ----
 
 However, you will probably want to include some of the other directives. The
@@ -2750,9 +2839,9 @@ synchronisation. The smallest useful configuration file would look something
 like:
 
 ----
-server foo.example.net iburst
-server bar.example.net iburst
-server baz.example.net iburst
+server ntp1.example.net iburst
+server ntp2.example.net iburst
+server ntp3.example.net iburst
 driftfile @CHRONYVARDIR@/drift
 makestep 1.0 3
 rtcsync
@@ -2776,9 +2865,9 @@ option will enable a secure synchronisation to the servers. The configuration
 file could look like:
 
 ----
-server foo.example.net iburst nts
-server bar.example.net iburst nts
-server baz.example.net iburst nts
+server ntp1.example.net iburst nts
+server ntp2.example.net iburst nts
+server ntp3.example.net iburst nts
 driftfile @CHRONYVARDIR@/drift
 makestep 1.0 3
 rtcsync
@@ -2792,14 +2881,14 @@ additional configuration to tell *chronyd* when the connection goes up and
 down. This saves the program from continuously trying to poll the servers when
 they are inaccessible.
 
-Again, assuming that your NTP servers are called _foo.example.net_,
-_bar.example.net_ and _baz.example.net_, your _chrony.conf_ file would now
+Again, assuming that your NTP servers are called _ntp1.example.net_,
+_ntp2.example.net_ and _ntp3.example.net_, your _chrony.conf_ file would now
 contain:
 
 ----
-server foo.example.net offline
-server bar.example.net offline
-server baz.example.net offline
+server ntp1.example.net offline
+server ntp2.example.net offline
+server ntp3.example.net offline
 driftfile @CHRONYVARDIR@/drift
 makestep 1.0 3
 rtcsync
@@ -2983,9 +3072,9 @@ configuration files are shown.
 For the _chrony.conf_ file, the following can be used as an example.
 
 ----
-server foo.example.net maxdelay 0.4 offline
-server bar.example.net maxdelay 0.4 offline
-server baz.example.net maxdelay 0.4 offline
+server ntp1.example.net maxdelay 0.4 offline
+server ntp2.example.net maxdelay 0.4 offline
+server ntp3.example.net maxdelay 0.4 offline
 logdir /var/log/chrony
 log statistics measurements tracking
 driftfile @CHRONYVARDIR@/drift
@@ -3044,10 +3133,10 @@ configuration).
 The configuration file could look like:
 
 ----
-server foo.example.net iburst
-server bar.example.net iburst
-server baz.example.net iburst
-server qux.example.net iburst
+server ntp1.example.net iburst
+server ntp2.example.net iburst
+server ntp3.example.net iburst
+server ntp4.example.net iburst
 makestep 1.0 3
 rtcsync
 allow
@@ -3064,7 +3153,7 @@ dumpdir @CHRONYRUNDIR@
 == BUGS
 
 For instructions on how to report bugs, please visit
-https://chrony.tuxfamily.org/.
+https://chrony-project.org/.
 
 == AUTHORS
 

doc/chronyc.adoc

@@ -2,7 +2,7 @@
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Stephen Wadeley  2016
-// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2022
+// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2023
 //
 // 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
@@ -89,6 +89,10 @@ format. Reverse DNS lookups will be disabled, time will be printed as number of
 seconds since the epoch, and values in seconds will not be converted to other
 units.
 
+*-e*::
+With this option each *chronyc* response will end with a line containing a
+single dot.
+
 *-d*::
 This option enables printing of debugging messages if *chronyc* was compiled
 with debugging support.
@@ -140,7 +144,7 @@ The *tracking* command displays parameters about the system's clock
 performance. An example of the output is shown below.
 +
 ----
-Reference ID    : CB00710F (foo.example.net)
+Reference ID    : CB00710F (ntp1.example.net)
 Stratum         : 3
 Ref time (UTC)  : Fri Jan 27 09:49:17 2017
 System time     : 0.000006523 seconds slow of NTP time
@@ -174,7 +178,7 @@ with an IPv4 address.
 *Stratum*:::
 The stratum indicates how many hops away from a computer with an attached
 reference clock we are. Such a computer is a stratum-1 computer, so the
-computer in the example is two hops away (i.e. _foo.example.net_ is a
+computer in the example is two hops away (i.e. _ntp1.example.net_ is a
 stratum-2 and is synchronised from a stratum-1).
 *Ref time*:::
 This is the time (UTC) at which the last measurement from the reference
@@ -317,8 +321,8 @@ extra caption lines are shown as a reminder of the meanings of the columns.
 MS Name/IP address         Stratum Poll Reach LastRx Last sample
 ===============================================================================
 #* GPS0                          0   4   377    11   -479ns[ -621ns] +/-  134ns
-^? foo.example.net               2   6   377    23   -923us[ -924us] +/-   43ms
-^+ bar.example.net               1   6   377    21  -2629us[-2619us] +/-   86ms
+^? ntp1.example.net              2   6   377    23   -923us[ -924us] +/-   43ms
+^+ ntp2.example.net              1   6   377    21  -2629us[-2619us] +/-   86ms
 ----
 +
 The columns are as follows:
@@ -375,9 +379,9 @@ offset. This can be suffixed by _ns_ (indicating nanoseconds), _us_
 (indicating microseconds), _ms_ (indicating milliseconds), or _s_ (indicating
 seconds). The number to the left of the square brackets shows the original
 measurement, adjusted to allow for any slews applied to the local clock
-since. The number following the _+/-_ indicator shows the margin of error in
-the measurement. Positive offsets indicate that the local clock is ahead of
-the source.
+since. Positive offsets indicate that the local clock is ahead of the source.
+The number following the _+/-_ indicator shows the margin of error in the
+measurement (NTP root distance).
 
 [[sourcestats]]*sourcestats* [*-a*] [*-v*]::
 The *sourcestats* command displays information about the drift rate and offset
@@ -396,7 +400,7 @@ An example report is:
 ----
 Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
 ===============================================================================
-foo.example.net            11   5   46m     -0.001      0.045      1us    25us
+ntp1.example.net           11   5   46m     -0.001      0.045      1us    25us
 ----
 +
 The columns are as follows:
@@ -440,9 +444,9 @@ An example of the output is shown below.
 ----
 S Name/IP Address        Auth COpts EOpts Last Score     Interval  Leap
 =======================================================================
-D foo.example.net           Y ----- --TR-    4   1.0   -61ms   +62ms  N
-* bar.example.net           N ----- -----    0   1.0 -6846us +7305us  N
-+ baz.example.net           N ----- -----   10   1.0 -7381us +7355us  N
+D ntp1.example.net          Y ----- --TR-    4   1.0   -61ms   +62ms  N
+* ntp2.example.net          N ----- -----    0   1.0 -6846us +7305us  N
++ ntp3.example.net          N ----- -----   10   1.0 -7381us +7355us  N
 ----
 +
 The columns are as follows:
@@ -500,8 +504,8 @@ This column displays the configured selection options of the source.
 This column displays the current effective selection options of the source,
 which can be different from the configured options due to the authentication
 selection mode (configured by the
-<<chrony.conf.adoc#authselmode,*authselmode*>> directive). The symbols are the
-same as in the *COpts* column.
+<<chrony.conf.adoc#authselectmode,*authselectmode*>> directive). The symbols
+are the same as in the *COpts* column.
 *Last*:::
 This column displays how long ago was the last measurement of the source made
 when the selection was performed.
@@ -522,6 +526,23 @@ This column displays the current leap status of the source.
 * _-_ indicates that a leap second will be deleted at the end of the month.
 * _?_ indicates the unknown status (i.e. no valid measurement was made).
 
+[[selectopts]]*selectopts* _address|refid_ [_+|-option_]...::
+The *selectopts* command modifies the configured selection options of an NTP
+source specified by IP address (or the _ID#XXXXXXXXXX_ identifier used for
+unknown addresses), or a reference clock specified by reference ID as a string.
++
+The selection options can be added with the *+* symbol or removed with the *-*
+symbol. The *selectdata* command can be used to verify the configuration. The
+modified options will be applied in the next source selection, e.g. when a new
+measurement is made, or the *reselect* command is executed.
++
+An example of using this command is shown below.
++
+----
+selectopts 1.2.3.4 -noselect +prefer
+selectopts GPS +trust
+----
+
 [[reselect]]*reselect*::
 To avoid excessive switching between sources, *chronyd* can stay synchronised
 to a source even when it is not currently the best one among the available
@@ -571,9 +592,9 @@ shown below.
 ----
 Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
 =========================================================================
-foo.example.net              NTS     1   15  256 135m    0    0    8  100
-bar.example.net               SK    30   13  128    -    0    0    0    0
-baz.example.net                -     0    0    0    -    0    0    0    0
+ntp1.example.net             NTS     1   15  256 135m    0    0    8  100
+ntp2.example.net              SK    30   13  128    -    0    0    0    0
+ntp3.example.net               -     0    0    0    -    0    0    0    0
 ----
 +
 The columns are as follows:
@@ -610,6 +631,7 @@ be reported:
 * 13: AES128
 * 14: AES256
 * 15: AEAD-AES-SIV-CMAC-256
+* 30: AEAD-AES-128-GCM-SIV
 *KLen*:::
 This column shows the length of the key in bits.
 *Last*:::
@@ -736,7 +758,7 @@ parameters and options is identical to that for the
 An example of using this command is shown below.
 +
 ----
-add peer foo.example.net minpoll 6 maxpoll 10 key 25
+add peer ntp1.example.net minpoll 6 maxpoll 10 key 25
 ----
 
 [[add_pool]]*add pool* _name_ [_option_]...::
@@ -750,7 +772,7 @@ directive in the configuration file.
 An example of using this command is shown below:
 +
 ----
-add pool foo.example.net maxsources 3 iburst
+add pool ntp1.example.net maxsources 3 iburst
 ----
 
 [[add_server]]*add server* _name_ [_option_]...::
@@ -764,7 +786,7 @@ directive in the configuration file.
 An example of using this command is shown below:
 +
 ----
-add server foo.example.net minpoll 6 maxpoll 10 key 25
+add server ntp1.example.net minpoll 6 maxpoll 10 key 25
 ----
 
 [[delete]]*delete* _address_::
@@ -840,7 +862,7 @@ IPv6 addresses have first 48 bits equal to _2001:db8:789a_.
 Example of the three-argument form of the command is:
 +
 ----
-burst 2/10 foo.example.net
+burst 2/10 ntp1.example.net
 ----
 
 [[maxdelay]]*maxdelay* _address_ _delay_::
@@ -906,7 +928,7 @@ uses an IP address or a hostname. These forms are illustrated below.
 offline
 offline 255.255.255.0/1.2.3.0
 offline 2001:db8:789a::/48
-offline foo.example.net
+offline ntp1.example.net
 ----
 +
 The second form means that the *offline* command is to be applied to any source
@@ -948,17 +970,26 @@ current set of sources. It is equivalent to the *polltarget* option in the
 
 [[refresh]]*refresh*::
 The *refresh* command can be used to force *chronyd* to resolve the names of
-configured sources to IP addresses again, e.g. after suspending and resuming
-the machine in a different network.
+configured NTP sources to IP addresses again and replace any addresses missing
+in the list of resolved addresses.
 +
-Sources that stop responding will be replaced with newly resolved addresses
-automatically after 8 polling intervals, but this command can still be useful
-to replace them immediately and not wait until they are marked as unreachable.
+Sources that stop responding are replaced with newly resolved addresses
+automatically after 8 polling intervals. This command can be used to replace
+them immediately, e.g. after suspending and resuming the machine in a different
+network.
++
+Note that with pools which have more than 16 addresses, or not all IPv4 or IPv6
+addresses are included in a single DNS response (e.g. pool.ntp.org), this
+command might replace the addresses even if they are still in the pool.
 
 [[reload]]*reload* *sources*::
 The *reload sources* command causes *chronyd* to re-read all _*.sources_ files
 from the directories specified by the
 <<chrony.conf.adoc#sourcedir,*sourcedir*>> directive.
++
+Note that modified sources (e.g. specified with a new option) are not modified
+in memory. They are removed and added again, which causes them to lose old
+measurements and reset the selection state.
 
 [[sourcename]]*sourcename* _address_::
 The *sourcename* command prints the original hostname or address that was
@@ -1067,7 +1098,7 @@ particular host.
 Examples of use, showing a named host and a numeric IP address, are as follows:
 +
 ----
-accheck foo.example.net
+accheck ntp1.example.net
 accheck 1.2.3.4
 accheck 2001:db8::1
 ----
@@ -1094,7 +1125,7 @@ An example of the output is:
 Hostname                      NTP   Drop Int IntL Last     Cmd   Drop Int  Last
 ===============================================================================
 localhost                       2      0   2   -   133      15      0  -1     7
-foo.example.net                12      0   6   -    23       0      0   -     -
+ntp1.example.net               12      0   6   -    23       0      0   -     -
 ----
 +
 Each row shows the data for a single host. Only hosts that have passed the host
@@ -1136,6 +1167,12 @@ Authenticated NTP packets  : 189
 Interleaved NTP packets    : 43
 NTP timestamps held        : 44
 NTP timestamp span         : 120
+NTP daemon RX timestamps   : 0
+NTP daemon TX timestamps   : 1537
+NTP kernel RX timestamps   : 1590
+NTP kernel TX timestamps   : 43
+NTP hardware RX timestamps : 0
+NTP hardware TX timestamps : 0
 ----
 +
 The fields have the following meaning:
@@ -1170,10 +1207,24 @@ The number of pairs of receive and transmit timestamps that the server is
 currently holding in memory for clients using the interleaved mode.
 *NTP timestamp span*:::
 The interval (in seconds) covered by the currently held NTP timestamps.
-{blank}::
-+
-Note that the numbers reported by this overflow to zero after 4294967295
-(32-bit values).
+*NTP daemon RX timestamps*:::
+The number of NTP responses which included a receive timestamp captured by the
+daemon.
+*NTP daemon TX timestamps*:::
+The number of NTP responses which included a transmit timestamp captured by the
+daemon.
+*NTP kernel RX timestamps*:::
+The number of NTP responses which included a receive timestamp captured by the
+kernel.
+*NTP kernel TX timestamps*:::
+The number of NTP responses (in the interleaved mode) which included a transmit
+timestamp captured by the kernel.
+*NTP hardware RX timestamps*:::
+The number of NTP responses which included a receive timestamp captured by the
+NIC.
+*NTP hardware TX timestamps*:::
+The number of NTP responses (in the interleaved mode) which included a transmit
+timestamp captured by the NIC.
 
 [[allow]]*allow* [*all*] [_subnet_]::
 The effect of the allow command is identical to the
@@ -1212,8 +1263,8 @@ deny all
 *local* *off*::
 The *local* command allows *chronyd* to be told that it is to appear as a
 reference source, even if it is not itself properly synchronised to an external
-source. (This can be used on isolated networks, to allow one computer to be a
-master time server with the other computers slaving to it.)
+source. This can be used on isolated networks, to allow a computer to be the
+primary time server for other computers.
 +
 The first form enables the local reference mode on the host. The syntax is
 identical to the <<chrony.conf.adoc#local,*local*>> directive in the
@@ -1274,7 +1325,7 @@ used to check whether monitoring access is permitted from a named host.
 Examples of use are as follows:
 +
 ----
-cmdaccheck foo.example.net
+cmdaccheck ntp1.example.net
 cmdaccheck 1.2.3.4
 cmdaccheck 2001:db8::1
 ----
@@ -1501,7 +1552,7 @@ The *help* command displays a summary of the commands and their arguments.
 == BUGS
 
 For instructions on how to report bugs, please visit
-https://chrony.tuxfamily.org/.
+https://chrony-project.org/.
 
 == AUTHORS
 

doc/chronyd.adoc

@@ -72,9 +72,9 @@ terminal.
 
 *-L* _level_::
 This option specifies the minimum severity level of messages to be written to
-the log file, syslog, or terminal. The following levels can be specified:
-0 (informational), 1 (warning), 2 (non-fatal error), and 3 (fatal error). The
-default value is 0.
+the log file, syslog, or terminal. The following levels can be specified: -1
+(debug, if compiled with enabled support for debugging), 0 (informational), 1
+(warning), 2 (non-fatal error), and 3 (fatal error). The default value is 0.
 
 *-p*::
 When run in this mode, *chronyd* will print the configuration and exit. It will
@@ -88,8 +88,10 @@ will not detach from the terminal.
 
 *-Q*::
 This option is similar to the *-q* option, except it only prints the offset
-without making any corrections of the clock and it allows *chronyd* to be
-started without root privileges.
+without making any corrections of the clock and disables server ports to allow
+*chronyd* to be started without root privileges, assuming the configuration
+does not have any directives which would require them (e.g. *refclock*,
+*hwtimestamp*, *rtcfile*, etc).
 
 *-r*::
 This option will try to reload and then delete files containing sample
@@ -204,6 +206,17 @@ With this option *chronyd* will print version number to the terminal and exit.
 *-h*, *--help*::
 With this option *chronyd* will print a help message to the terminal and exit.
 
+== ENVIRONMENT VARIABLES
+
+*LISTEN_FDS*::
+On Linux systems, the systemd service manager may pass file descriptors for
+pre-initialised sockets to *chronyd*. The service manager allocates and binds
+the file descriptors, and passes a copy to each spawned instance of the
+service. This allows for zero-downtime service restarts as the sockets buffer
+client requests until the service is able to handle them. The service manager
+sets the LISTEN_FDS environment variable to the number of passed file
+descriptors.
+
 == FILES
 
 _@SYSCONFDIR@/chrony.conf_
@@ -215,7 +228,7 @@ _@SYSCONFDIR@/chrony.conf_
 == BUGS
 
 For instructions on how to report bugs, please visit
-https://chrony.tuxfamily.org/.
+https://chrony-project.org/.
 
 == AUTHORS
 

doc/faq.adoc

@@ -1,7 +1,8 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
-// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2022
+// Copyright (C) Luke Valenta  2023
+// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2023
 //
 // 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
@@ -40,9 +41,36 @@ on an isolated network with no hardware reference clocks in sight, `chrony`
 will probably work better for you.
 
 For a more detailed comparison of features and performance, see the
-https://chrony.tuxfamily.org/comparison.html[comparison page] on the `chrony`
+https://chrony-project.org/comparison.html[comparison page] on the `chrony`
 website.
 
+=== Should I prefer `chrony` over `timesyncd` if I do not need to run a server?
+
+Generally, yes.
+
+`systemd-timesyncd` is a very simple NTP client included in the `systemd`
+suite. It lacks almost all features of `chrony` and other advanced client
+implementations listed on the
+https://chrony-project.org/comparison.html[comparison page]. One of its main
+limitations is that it cannot poll multiple servers at the same time and detect
+servers having incorrect time (falsetickers in the NTP terminology). It should
+be used only with trusted reliable servers, ideally in local network.
+
+Using `timesyncd` with `pool.ntp.org` is problematic. The pool is very
+robust as a whole, but the individual servers run by volunteers cannot be
+relied on. Occasionally, servers drift away or make a step to distant past or
+future due to misconfiguration, problematic implementation, and other bugs
+(e.g. in firmware of a GPS receiver). The pool monitoring system detects such
+servers and quickly removes them from the pool DNS, but clients like
+`timesyncd` cannot recover from that. They follow the server as long as it
+claims to be synchronised. They need to be restarted in order to get a new
+address from the pool DNS.
+
+Note that the complexity of NTP and clock synchronisation is on the client
+side. The amount of code in `chrony` specific to NTP server is very small and
+it is disabled by default. If it was removed, it would not significantly reduce
+the amount of memory or storage needed.
+
 == Configuration issues
 
 === What is the minimum recommended configuration for an NTP client?
@@ -232,17 +260,17 @@ authenticated servers should be configured as trusted and required to not allow
 the unauthenticated servers to override the authenticated servers in the source
 selection. Since `chrony` version 4.0, the selection options are enabled in
 such a case automatically. This behaviour can be disabled or modified by the
-`authselmode` directive.
+`authselectmode` directive.
 
 An example of a client configuration limiting the impact of the attacks could
 be
 
 ----
-server foo.example.net iburst nts maxdelay 0.1
-server bar.example.net iburst nts maxdelay 0.2
-server baz.example.net iburst nts maxdelay 0.05
-server qux.example.net iburst nts maxdelay 0.1
-server quux.example.net iburst nts maxdelay 0.1
+server ntp1.example.net iburst nts maxdelay 0.1
+server ntp2.example.net iburst nts maxdelay 0.2
+server ntp3.example.net iburst nts maxdelay 0.05
+server ntp4.example.net iburst nts maxdelay 0.1
+server ntp5.example.net iburst nts maxdelay 0.1
 minsources 3
 maxchange 100 0 0
 makestep 0.001 1
@@ -291,7 +319,7 @@ An example of the directive for an NTP server on the Internet that you are
 allowed to poll frequently could be
 
 ----
-server foo.example.net minpoll 4 maxpoll 6 polltarget 16
+server ntp.example.net minpoll 4 maxpoll 6 polltarget 16
 ----
 
 An example using shorter polling intervals with a server located in the same
@@ -354,7 +382,7 @@ outliers corrupting the minimum delay. For example:
 server ntp.local minpoll -7 maxpoll -7 filter 31 maxdelayquant 0.3 xleave
 ----
 
-As an experimental feature added in version 4.2, `chronyd` supports an NTPv4
+Since version 4.2, `chronyd` supports an NTPv4
 extension field containing an additional timestamp to enable frequency transfer
 and significantly improve stability of synchronisation. It can be enabled by
 the `extfield F323` option. For example:
@@ -363,6 +391,18 @@ the `extfield F323` option. For example:
 server ntp.local minpoll 0 maxpoll 0 xleave extfield F323
 ----
 
+Since version 4.5, `chronyd` can apply corrections from PTP one-step end-to-end
+transparent clocks (e.g. network switches) to significantly improve accuracy of
+synchronisation in local networks. It requires the PTP transport to be enabled
+by the `ptpport` directive, HW timestamping, and the `extfield F324` option.
+For example:
+
+----
+server ntp.local minpoll -4 maxpoll -4 xleave extfield F323 extfield F324 port 319
+ptpport 319
+hwtimestamp eth0 minpoll -4
+----
+
 === Does `chronyd` have an ntpdate mode?
 
 Yes. With the `-q` option `chronyd` will set the system clock once and exit.
@@ -470,6 +510,59 @@ pidfile /var/run/chronyd-server1.pid
 driftfile /var/lib/chrony/drift-server1
 ----
 
+=== How can `chronyd` be configured to minimise downtime during restarts?
+
+The `dumpdir` directive in _chrony.conf_ provides `chronyd` a location to save
+a measurement history of the sources it uses when the service exits. The `-r`
+option then enables `chronyd` to load state from the dump files, reducing the
+synchronisation time after a restart.
+
+Similarly, the `ntsdumpdir` directive provides a location for `chronyd` to save
+NTS cookies received from the server to avoid making a NTS-KE request when
+`chronyd` is started. When operating as an NTS server, `chronyd` also saves
+cookies keys to this directory to allow clients to continue to use the old keys
+after a server restart for a more seamless experience.
+
+On Linux systems,
+https://www.freedesktop.org/software/systemd/man/latest/sd_listen_fds.html[systemd
+socket activation] provides a mechanism to reuse server sockets across
+`chronyd` restarts, so that client requests will be buffered until the service
+is again able to handle the requests. This allows for zero-downtime service
+restarts, simplified dependency logic at boot, and on-demand service spawning
+(for instance, for separated server `chronyd` instances run with the `-x`
+flag).
+
+Socket activation is supported since `chrony` version 4.5.
+The service manager (systemd) creates sockets and
+passes file descriptors to them to the process via the `LISTEN_FDS` environment
+variable. Before opening new sockets, `chronyd` first checks for and attempts
+to reuse matching sockets passed from the service manager. For instance, if an
+IPv4 datagram socket bound on `bindaddress` and `port` is available, it will be
+used by the NTP server to accept incoming IPv4 requests.
+
+An example systemd socket unit is below, where `chronyd` is configured with
+`bindaddress 0.0.0.0`, `bindaddress ::`, `port 123`, and `ntsport 4460`.
+
+----
+[Unit]
+Description=chronyd server sockets
+
+[Socket]
+Service=chronyd.service
+# IPv4 NTP server
+ListenDatagram=0.0.0.0:123
+# IPv6 NTP server
+ListenDatagram=[::]:123
+# IPv4 NTS-KE server
+ListenStream=0.0.0.0:4460
+# IPv6 NTS-KE server
+ListenStream=[::]:4460
+BindIPv6Only=ipv6-only
+
+[Install]
+WantedBy=sockets.target
+----
+
 === Should be a leap smear enabled on NTP server?
 
 With the `smoothtime` and `leapsecmode` directives it is possible to enable a
@@ -484,7 +577,7 @@ identically configured leap-smearing servers. Note that some clients can get
 leap seconds from other sources (e.g. with the `leapsectz` directive in
 `chrony`) and they will not work correctly with a leap smearing server.
 
-=== How should `chronyd` be configuration with `gpsd`?
+=== How should `chronyd` be configured with `gpsd`?
 
 A GPS or other GNSS receiver can be used as a reference clock with `gpsd`. It
 can work as one or two separate time sources for each connected receiver. The
@@ -499,45 +592,53 @@ it is connected to a GPIO pin, or another serial port, the PPS device needs to
 be specified on the command line as an additional data source. On Linux, the
 `ldattach` utility can be used to create a PPS device for a serial device.
 
-The message-based time source provided by `gpsd` is specified as a `SHM 0`
-refclock, or other even number if `gpsd` is configured with multiple receivers.
-
-The PPS-based time source is specified as a `SHM 1` refclock (or other odd
-number), or `SOCK /var/run/chrony.DEV.sock` where `DEV` is the name of the
+The PPS-based time source provided by `gpsd` is available as a `SHM 1`
+refclock, or other odd number if `gpsd` is configured with multiple receivers,
+and also as `SOCK /var/run/chrony.DEV.sock` where `DEV` is the name of the
 serial device (e.g. ttyS0).
 
-With `chronyd` and `gpsd` both supporting PPS, and `gpsd` providing two
-different refclocks for PPS, there are three different recommended
-configurations:
+The message-based time source is available as a `SHM 0` refclock (or other even
+number) and since `gpsd` version 3.25 also as
+`SOCK /var/run/chrony.clk.DEV.sock` where `DEV` is the name of the serial
+device.
+
+The SOCK refclocks should be preferred over SHM for better security
+(the shared memory segment needs to be created by `chronyd` or `gpsd` with an
+expected owner and permissions before an untrusted application or user has a
+chance to create its own in order to feed `chronyd` with false measurements).
+`gpsd` needs to be started after `chronyd` in order to connect to the socket.
+
+With `chronyd` and `gpsd` both supporting PPS, there are two different
+recommended configurations:
 
 ----
 # First option
 refclock SOCK /var/run/chrony.ttyS0.sock refid GPS
 
 # Second option
-refclock SHM 1 refid GPS
-
-# Third option
 refclock PPS /dev/pps0 lock NMEA refid GPS
-refclock SHM 0 offset 0.5 delay 0.1 refid NMEA noselect
+refclock SOCK /var/run/chrony.clk.ttyS0.sock offset 0.5 delay 0.1 refid NMEA noselect
 ----
 
-Each option has some advantages:
+They both have some advantages:
 
-* `SOCK` does not use polling (i.e. it can get samples earlier than `SHM`),
-  but it requires `gpsd` to be started after `chronyd` in order to connect to
-  its socket
-* `SOCK` and `SHM 1` can be more accurate than `PPS` if `gpsd` corrects for the
+* `SOCK` can be more accurate than `PPS` if `gpsd` corrects for the
   sawtooth error provided by the receiver in serial data
 * `PPS` can be used with higher PPS rates (specified by the `rate` option),
   but it requires a second refclock or another time source to pair pulses
-  with seconds, and the `SHM 0` offset needs to be specified
+  with seconds, and the `SOCK` offset needs to be specified
   <<using-pps-refclock,correctly>> to compensate for the message delay, while
   `gpsd` can apply HW-specific information
 
 If the PPS signal is not available, or cannot be used for some reason, the only
 option is the message-based timing
 
+----
+refclock SOCK /var/run/chrony.clk.ttyS0.sock offset 0.5 delay 0.1 refid GPS
+----
+
+or the SHM equivalent if using `gpsd` version before 3.25
+
 ----
 refclock SHM 0 offset 0.5 delay 0.1 refid GPS
 ----
@@ -563,7 +664,28 @@ The `ethtool -T` command can be used to verify the timestamping support.
 As an experimental feature added in version 4.2, `chrony` can use PTP as a
 transport for NTP messages (NTP over PTP) to enable hardware timestamping on
 hardware which can timestamp PTP packets only. It can be enabled by the
-`ptpport` directive.
+`ptpport` directive. Since version 4.5, `chrony` can also apply corrections
+provided by PTP one-step end-to-end transparent clocks to reach the accuracy of
+ordinary PTP clocks. The application of PTP corrections can be enabled by the
+`extfield F324` option.
+
+=== How can I avoid using wrong PHC refclock?
+
+If your system has multiple PHC devices, normally named by `udev` as
+_/dev/ptp0_, _/dev/ptp1_, and so on, their order can change randomly across
+reboots depending on the order of initialisation of their drivers. If a PHC
+refclock is specified by this name, `chronyd` could be using a wrong refclock
+after reboot. To prevent that, you can configure `udev` to create a stable
+symlink for `chronyd` with a rule like this (e.g. written to
+_/etc/udev/rules.d/80-phc.rules_):
+
+----
+KERNEL=="ptp[0-9]*", DEVPATH=="/devices/pci0000:00/0000:00:01.2/0000:02:00.0/ptp/*", SYMLINK+="ptp-i350-1"
+----
+
+You can get the full _DEVPATH_ of an existing PHC device with the `udevadm
+info` command. You will need to execute the `udevadm trigger` command, or
+reboot the system, for these changes to take effect.
 
 === Why are client log records dropped before reaching `clientloglimit`?
 
@@ -605,8 +727,9 @@ following questions.
 Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it
 is zero, it means `chronyd` did not get any valid responses from the NTP server
 you are trying to use. If there is a firewall between you and the server, the
-packets might be blocked. Try using a tool like `wireshark` or `tcpdump` to see
-if you are getting any responses from the server.
+requests sent to the UDP port 123 of the server or responses sent back from
+the port might be blocked. Try using a tool like `wireshark` or `tcpdump` to
+see if you are getting any responses from the server.
 
 When `chronyd` is receiving responses from the servers, the output of the
 `sources` command issued few minutes after `chronyd` start might look like
@@ -615,9 +738,9 @@ this:
 ----
 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
+^* ntp1.example.net              2   6   377    34   +484us[ -157us] +/-   30ms
+^- ntp2.example.net              2   6   377    34    +33ms[  +32ms] +/-   47ms
+^+ ntp3.example.net              3   6   377    35  -1397us[-2033us] +/-   60ms
 ----
 
 === Are NTP servers specified with the `offline` option?
@@ -687,9 +810,9 @@ successful:
 # chronyc -N authdata
 Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
 =========================================================================
-foo.example.net              NTS     1   15  256  33m    0    0    8  100
-bar.example.net              NTS     1   15  256  33m    0    0    8  100
-baz.example.net              NTS     1   15  256  33m    0    0    8  100
+ntp1.example.net             NTS     1   15  256  33m    0    0    8  100
+ntp2.example.net             NTS     1   15  256  33m    0    0    8  100
+ntp3.example.net             NTS     1   15  256  33m    0    0    8  100
 ----
 
 The KeyID, Type, and KLen columns should have non-zero values. If they are
@@ -813,7 +936,7 @@ Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
 ==============================================================================
 PPS0                        0   0     0     +0.000   2000.000     +0ns  4000ms
 NMEA                       58  30   231    -96.494     38.406   +504ms  6080us
-foo.example.net             7   3   200     -2.991     16.141   -107us   492us
+ntp1.example.net            7   3   200     -2.991     16.141   -107us   492us
 ----
 
 the offset of the NMEA source would need to be increased by about 0.504

examples/chrony-wait.service

@@ -25,7 +25,6 @@ LockPersonality=yes
 MemoryDenyWriteExecute=yes
 PrivateDevices=yes
 PrivateUsers=yes
-ProcSubset=pid
 ProtectClock=yes
 ProtectControlGroups=yes
 ProtectHome=yes

examples/chrony.conf.example3

@@ -27,9 +27,9 @@
 # you can access at http://support.ntp.org/bin/view/Servers/WebHome or
 # you can use servers from the pool.ntp.org project.
 
-! server foo.example.net iburst
-! server bar.example.net iburst
-! server baz.example.net iburst
+! server ntp1.example.net iburst
+! server ntp2.example.net iburst
+! server ntp3.example.net iburst
 
 ! pool pool.ntp.org iburst
  
@@ -99,8 +99,8 @@ ntsdumpdir /var/lib/chrony
 # and edit the following lines to specify the locations of the certificate and
 # key.
 
-! ntsservercert /etc/.../foo.example.net.crt
-! ntsserverkey /etc/.../foo.example.net.key
+! ntsservercert /etc/.../nts-server.crt
+! ntsserverkey /etc/.../nts-server.key
 
 # chronyd can save the measurement history for the servers to files when
 # it exits.  This is useful in 2 situations:
@@ -238,7 +238,7 @@ ntsdumpdir /var/lib/chrony
 # several people, you need to set up a mailing list or sendmail alias
 # for them and use the address of that.)
 
-! mailonchange wibble@foo.example.net 0.5
+! mailonchange wibble@example.net 0.5
 
 #######################################################################
 ### COMMAND ACCESS

examples/chrony.keys.example

@@ -11,3 +11,5 @@
 #1 MD5 AVeryLongAndRandomPassword
 #2 MD5 HEX:12114855C7931009B4049EF3EFC48A139C3F989F
 #3 SHA1 HEX:B2159C05D6A219673A3B7E896B6DE07F6A440995
+#4 AES128 HEX:2DA837C4B6573748CA692B8C828E4891
+#5 AES256 HEX:2666B8099BFF2D5BA20876121788ED24D2BE59111B8FFB562F0F56AE6EC7246E

examples/chrony.nm-dispatcher.onoffline

@@ -12,8 +12,10 @@ if [ $# -ge 2 ]; then
     case "$2" in
         up|down|connectivity-change)
             ;;
-        dhcp6-change)
-            # No other action is reported for routable IPv6
+        dhcp4-change|dhcp6-change)
+            # Actions "up" and "connectivity-change" in some cases do not
+            # guarantee that the interface has a route (e.g. a bond).
+            # dhcp(x)-change handles at least cases that use DHCP.
             ;;
         *)
             exit 0;;

examples/chronyd-restricted.service

@@ -0,0 +1,58 @@
+# This is a more restricted version of the chronyd service intended for
+# minimal NTP/NTS client configurations. The daemon is started without root
+# privileges and is allowed to write only to its own runtime, state, and log
+# directories. It cannot bind to privileged ports in order to operate as an
+# NTP server, or provide monitoring access over IPv4/IPv6. It cannot use
+# reference clocks, HW timestamping, RTC tracking, and other features.
+[Unit]
+Description=NTP client (restricted)
+Documentation=man:chronyd(8) man:chrony.conf(5)
+After=chronyd.service ntpdate.service sntp.service ntpd.service
+Conflicts=chronyd.service ntpd.service systemd-timesyncd.service
+ConditionCapability=CAP_SYS_TIME
+
+[Service]
+Type=forking
+PIDFile=/run/chrony/chronyd.pid
+EnvironmentFile=-/etc/sysconfig/chronyd
+ExecStart=/usr/sbin/chronyd -U $OPTIONS
+
+User=chrony
+LogsDirectory=chrony
+LogsDirectoryMode=0750
+RuntimeDirectory=chrony
+RuntimeDirectoryMode=0750
+RuntimeDirectoryPreserve=restart
+StateDirectory=chrony
+StateDirectoryMode=0750
+
+AmbientCapabilities=CAP_SYS_TIME
+CapabilityBoundingSet=CAP_SYS_TIME
+DevicePolicy=closed
+LockPersonality=yes
+MemoryDenyWriteExecute=yes
+NoNewPrivileges=yes
+PrivateDevices=yes
+PrivateTmp=yes
+# This breaks adjtimex()
+#PrivateUsers=yes
+ProtectControlGroups=yes
+ProtectHome=yes
+ProtectHostname=yes
+ProtectKernelLogs=yes
+ProtectKernelModules=yes
+ProtectKernelTunables=yes
+ProtectProc=invisible
+ProtectSystem=strict
+RemoveIPC=yes
+RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
+RestrictNamespaces=yes
+RestrictRealtime=yes
+RestrictSUIDSGID=yes
+SystemCallArchitectures=native
+SystemCallFilter=~@cpu-emulation @debug @module @mount @obsolete @raw-io
+SystemCallFilter=~@reboot @resources @swap
+UMask=0077
+
+[Install]
+WantedBy=multi-user.target

examples/chronyd.service

@@ -24,7 +24,6 @@ LockPersonality=yes
 MemoryDenyWriteExecute=yes
 NoNewPrivileges=yes
 PrivateTmp=yes
-ProcSubset=pid
 ProtectControlGroups=yes
 ProtectHome=yes
 ProtectHostname=yes

getdate.y

@@ -448,9 +448,9 @@ o_merid	: /* NULL */
    the same signature as the function definition does. */
 #include "getdate.h"
 
-extern struct tm	*gmtime ();
-extern struct tm	*localtime ();
-extern time_t		mktime ();
+extern struct tm	*gmtime (const time_t *timep);
+extern struct tm	*localtime (const time_t *timep);
+extern time_t		mktime (struct tm *tm);
 
 /* Month and day table. */
 static TABLE const MonthDayTable[] = {
@@ -641,16 +641,13 @@ static TABLE const MilitaryTable[] = {
 
 /* ARGSUSED */
 static int
-yyerror (s)
-     char *s ATTRIBUTE_UNUSED;
+yyerror (char *s ATTRIBUTE_UNUSED)
 {
   return 0;
 }
 
 static int
-ToHour (Hours, Meridian)
-     int Hours;
-     MERIDIAN Meridian;
+ToHour (int Hours, MERIDIAN Meridian)
 {
   switch (Meridian)
     {
@@ -677,8 +674,7 @@ ToHour (Hours, Meridian)
 }
 
 static int
-ToYear (Year)
-     int Year;
+ToYear (int Year)
 {
   if (Year < 0)
     Year = -Year;
@@ -694,8 +690,7 @@ ToYear (Year)
 }
 
 static int
-LookupWord (buff)
-     char *buff;
+LookupWord (char *buff)
 {
   register char *p;
   register char *q;

keys.c

@@ -182,6 +182,9 @@ KEY_Reload(void)
   if (!key_file)
     return;
 
+  if (!UTI_CheckFilePermissions(key_file, 0771))
+    ;
+
   in = UTI_OpenFile(NULL, key_file, NULL, 'r', 0);
   if (!in) {
     LOG(LOGS_WARN, "Could not open keyfile %s", key_file);
@@ -255,6 +258,8 @@ KEY_Reload(void)
      more careful! */
   qsort(ARR_GetElements(keys), ARR_GetSize(keys), sizeof (Key), compare_keys_by_id);
 
+  LOG(LOGS_INFO, "Loaded %u symmetric keys", ARR_GetSize(keys));
+
   /* Check for duplicates */
   for (i = 1; i < ARR_GetSize(keys); i++) {
     if (get_key(i - 1)->id == get_key(i)->id)

logging.c

@@ -39,6 +39,9 @@
 /* This is used by DEBUG_LOG macro */
 LOG_Severity log_min_severity = LOGS_INFO;
 
+/* Current logging contexts */
+static LOG_Context log_contexts;
+
 /* ================================================== */
 /* Flag indicating we have initialised */
 static int initialised = 0;
@@ -72,6 +75,8 @@ void
 LOG_Initialise(void)
 {
   debug_prefix = Strdup("");
+  log_contexts = 0;
+
   initialised = 1;
   LOG_OpenFileLog(NULL);
 }
@@ -140,6 +145,7 @@ void LOG_Message(LOG_Severity severity,
   struct tm *tm;
 
   assert(initialised);
+  severity = CLAMP(LOGS_DEBUG, severity, LOGS_FATAL);
 
   if (!system_log && file_log && severity >= log_min_severity) {
     /* Don't clutter up syslog with timestamps and internal debugging info */
@@ -150,8 +156,13 @@ void LOG_Message(LOG_Severity severity,
       fprintf(file_log, "%s ", buf);
     }
 #if DEBUG > 0
-    if (log_min_severity <= LOGS_DEBUG)
-      fprintf(file_log, "%s%s:%d:(%s) ", debug_prefix, filename, line_number, function_name);
+    if (log_min_severity <= LOGS_DEBUG) {
+      /* Log severity to character mapping (debug, info, warn, err, fatal) */
+      const char severity_chars[LOGS_FATAL - LOGS_DEBUG + 1] = {'D', 'I', 'W', 'E', 'F'};
+
+      fprintf(file_log, "%c:%s%s:%d:(%s) ", severity_chars[severity - LOGS_DEBUG],
+              debug_prefix, filename, line_number, function_name);
+    }
 #endif
   }
 
@@ -237,6 +248,30 @@ LOG_GetMinSeverity(void)
 
 /* ================================================== */
 
+void
+LOG_SetContext(LOG_Context context)
+{
+  log_contexts |= context;
+}
+
+/* ================================================== */
+
+void
+LOG_UnsetContext(LOG_Context context)
+{
+  log_contexts &= ~context;
+}
+
+/* ================================================== */
+
+LOG_Severity
+LOG_GetContextSeverity(LOG_Context contexts)
+{
+  return log_contexts & contexts ? LOGS_INFO : LOGS_DEBUG;
+}
+
+/* ================================================== */
+
 void
 LOG_SetDebugPrefix(const char *prefix)
 {

logging.h

@@ -100,6 +100,20 @@ extern void LOG_SetMinSeverity(LOG_Severity severity);
 /* Get the minimum severity */
 extern LOG_Severity LOG_GetMinSeverity(void);
 
+/* Flags for info messages that should be logged only in specific contexts */
+typedef enum {
+  LOGC_Command = 1,
+  LOGC_SourceFile = 2,
+} LOG_Context;
+
+/* Modify current contexts */
+extern void LOG_SetContext(LOG_Context context);
+extern void LOG_UnsetContext(LOG_Context context);
+
+/* Get severity depending on the current active contexts: INFO if they contain
+   at least one of the specified contexts, DEBUG otherwise */
+extern LOG_Severity LOG_GetContextSeverity(LOG_Context contexts);
+
 /* Set a prefix for debug messages */
 extern void LOG_SetDebugPrefix(const char *prefix);
 

main.c

@@ -331,6 +331,9 @@ go_daemon(void)
     char message[1024];
     int r;
 
+    /* Don't exit before the 'parent' */
+    waitpid(pid, NULL, 0);
+
     close(pipefd[1]);
     r = read(pipefd[0], message, sizeof (message));
     if (r) {
@@ -353,7 +356,9 @@ go_daemon(void)
     if (pid < 0) {
       LOG_FATAL("fork() failed : %s", strerror(errno));
     } else if (pid > 0) {
-      exit(0); /* In the 'parent' */
+      /* In the 'parent' */
+      close(pipefd[1]);
+      exit(0);
     } else {
       /* In the child we want to leave running as the daemon */
 
@@ -363,9 +368,9 @@ go_daemon(void)
       }
 
       /* Don't keep stdin/out/err from before. But don't close
-         the parent pipe yet. */
+         the parent pipe yet, or reusable file descriptors. */
       for (fd=0; fd<1024; fd++) {
-        if (fd != pipefd[1])
+        if (fd != pipefd[1] && !SCK_IsReusable(fd))
           close(fd);
       }
 
@@ -555,6 +560,9 @@ int main
   if (user_check && getuid() != 0)
     LOG_FATAL("Not superuser");
 
+  /* Initialise reusable file descriptors before fork */
+  SCK_PreInitialise();
+
   /* Turn into a daemon */
   if (!nofork) {
     go_daemon();
@@ -637,9 +645,13 @@ int main
   }
 
   /* Drop root privileges if the specified user has a non-zero UID */
-  if (!geteuid() && (pw->pw_uid || pw->pw_gid))
+  if (!geteuid() && (pw->pw_uid || pw->pw_gid)) {
     SYS_DropRoot(pw->pw_uid, pw->pw_gid, SYS_MAIN_PROCESS);
 
+    /* Warn if missing read access or having write access to keys */
+    CNF_CheckReadOnlyAccess();
+  }
+
   if (!geteuid())
     LOG(LOGS_WARN, "Running with root privileges");
 

md5.c

@@ -117,8 +117,7 @@ inline UINT4 ROTATE_LEFT(UINT4 x, int n)
 /* The routine MD5Init initializes the message-digest context
    mdContext. All fields are set to zero.
  */
-void MD5Init (mdContext)
-MD5_CTX *mdContext;
+void MD5Init (MD5_CTX *mdContext)
 {
   mdContext->i[0] = mdContext->i[1] = (UINT4)0;
 
@@ -134,10 +133,7 @@ MD5_CTX *mdContext;
    account for the presence of each of the characters inBuf[0..inLen-1]
    in the message whose digest is being computed.
  */
-void MD5Update (mdContext, inBuf, inLen)
-MD5_CTX *mdContext;
-unsigned const char *inBuf;
-unsigned int inLen;
+void MD5Update (MD5_CTX *mdContext, unsigned const char *inBuf, unsigned int inLen)
 {
   UINT4 in[16];
   int mdi;
@@ -173,8 +169,7 @@ unsigned int inLen;
    ends with the desired message digest in mdContext->digest[0...15].
  */
 
-void MD5Final (mdContext)
-MD5_CTX *mdContext;
+void MD5Final (MD5_CTX *mdContext)
 {
   UINT4 in[16];
   int mdi;
@@ -214,9 +209,7 @@ MD5_CTX *mdContext;
 
 /* Basic MD5 step. Transforms buf based on in.
  */
-static void Transform (buf, in)
-UINT4 *buf;
-UINT4 *in;
+static void Transform (UINT4 *buf, UINT4 *in)
 {
   UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 

memory.c

@@ -47,8 +47,13 @@ Realloc(void *ptr, size_t size)
 {
   void *r;
 
+  if (size == 0) {
+    Free(ptr);
+    return NULL;
+  }
+
   r = realloc(ptr, size);
-  if (!r && size)
+  if (!r)
     LOG_FATAL("Could not allocate memory");
 
   return r;

ntp.h

@@ -115,9 +115,11 @@ typedef struct {
 
 /* Non-authentication extension fields and corresponding internal flags */
 
-#define NTP_EF_EXP1                     0xF323
+#define NTP_EF_EXP_MONO_ROOT            0xF323
+#define NTP_EF_EXP_NET_CORRECTION       0xF324
 
-#define NTP_EF_FLAG_EXP1                0x1
+#define NTP_EF_FLAG_EXP_MONO_ROOT       0x1
+#define NTP_EF_FLAG_EXP_NET_CORRECTION  0x2
 
 /* Pre-NTPv5 experimental extension field */
 typedef struct {
@@ -126,9 +128,18 @@ typedef struct {
   NTP_int32 root_dispersion;
   NTP_int64 mono_receive_ts;
   uint32_t mono_epoch;
-} NTP_ExtFieldExp1;
+} NTP_EFExpMonoRoot;
 
-#define NTP_EF_EXP1_MAGIC 0xF5BEDD9AU
+#define NTP_EF_EXP_MONO_ROOT_MAGIC      0xF5BEDD9AU
+
+/* Experimental extension field to provide PTP corrections */
+typedef struct {
+  uint32_t magic;
+  NTP_int64 correction;
+  uint32_t reserved[3];
+} NTP_EFExpNetCorrection;
+
+#define NTP_EF_EXP_NET_CORRECTION_MAGIC 0x07AC2CEBU
 
 /* Authentication extension fields */
 
@@ -179,4 +190,11 @@ typedef struct {
   double root_dispersion;
 } NTP_Sample;
 
+/* Possible sources of timestamps */
+typedef enum {
+  NTP_TS_DAEMON = 0,
+  NTP_TS_KERNEL,
+  NTP_TS_HARDWARE
+} NTP_Timestamp_Source;
+
 #endif /* GOT_NTP_H */

ntp_core.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2022
+ * Copyright (C) Miroslav Lichvar  2009-2023
  * 
  * 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
@@ -64,6 +64,17 @@ typedef enum {
   MD_BURST_WAS_ONLINE,          /* Burst sampling, return to online afterwards */
 } OperatingMode;
 
+/* Structure holding a response and other data waiting to be processed when
+   a late HW transmit timestamp of the request is available, or a timeout is
+   reached */
+struct SavedResponse {
+  NTP_Local_Address local_addr;
+  NTP_Local_Timestamp rx_ts;
+  NTP_Packet message;
+  NTP_PacketInfo info;
+  SCH_TimeoutID timeout_id;
+};
+
 /* ================================================== */
 /* Structure used for holding a single peer/server's
    protocol machine */
@@ -204,6 +215,9 @@ struct NCR_Instance_Record {
   SPF_Instance filter;
   int filter_count;
 
+  /* Response waiting for a HW transmit timestamp of the request */
+  struct SavedResponse *saved_response;
+
   int burst_good_samples_to_go;
   int burst_total_samples_to_go;
 
@@ -300,6 +314,9 @@ static ARR_Instance broadcasts;
 /* Maximum acceptable change in server mono<->real offset */
 #define MAX_MONO_DOFFSET 16.0
 
+/* Maximum assumed frequency error in network corrections */
+#define MAX_NET_CORRECTION_FREQ 100.0e-6
+
 /* Invalid socket, different from the one in ntp_io.c */
 #define INVALID_SOCK_FD -2
 
@@ -324,10 +341,15 @@ static const char tss_chars[3] = {'D', 'K', 'H'};
 /* Forward prototypes */
 
 static void transmit_timeout(void *arg);
-static double get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx);
+static double get_transmit_delay(NCR_Instance inst, int on_tx);
 static double get_separation(int poll);
 static int parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info);
 static void process_sample(NCR_Instance inst, NTP_Sample *sample);
+static int has_saved_response(NCR_Instance inst);
+static void process_saved_response(NCR_Instance inst);
+static int process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
+                            NTP_Local_Timestamp *rx_ts, NTP_Packet *message,
+                            NTP_PacketInfo *info);
 static void set_connectivity(NCR_Instance inst, SRC_Connectivity connectivity);
 
 /* ================================================== */
@@ -354,6 +376,9 @@ do_size_checks(void)
   assert(offsetof(NTP_Packet, originate_ts)    == 24);
   assert(offsetof(NTP_Packet, receive_ts)      == 32);
   assert(offsetof(NTP_Packet, transmit_ts)     == 40);
+
+  assert(sizeof (NTP_EFExpMonoRoot) == 24);
+  assert(sizeof (NTP_EFExpNetCorrection) == 24);
 }
 
 /* ================================================== */
@@ -399,6 +424,8 @@ zero_local_timestamp(NTP_Local_Timestamp *ts)
   UTI_ZeroTimespec(&ts->ts);
   ts->err = 0.0;
   ts->source = NTP_TS_DAEMON;
+  ts->rx_duration = 0.0;
+  ts->net_correction = 0.0;
 }
 
 /* ================================================== */
@@ -490,8 +517,7 @@ restart_timeout(NCR_Instance inst, double delay)
 static void
 start_initial_timeout(NCR_Instance inst)
 {
-  double delay, last_tx;
-  struct timespec now;
+  double delay;
 
   if (!inst->tx_timeout_id) {
     /* This will be the first transmission after mode change */
@@ -504,11 +530,7 @@ start_initial_timeout(NCR_Instance inst)
      the interval between packets at least as long as the current polling
      interval */
   if (!UTI_IsZeroTimespec(&inst->local_tx.ts)) {
-    SCH_GetLastEventTime(&now, NULL, NULL);
-    last_tx = UTI_DiffTimespecsToDouble(&now, &inst->local_tx.ts);
-    if (last_tx < 0.0)
-      last_tx = 0.0;
-    delay = get_transmit_delay(inst, 0, 0.0) - last_tx;
+    delay = get_transmit_delay(inst, 0);
   } else {
     delay = 0.0;
   }
@@ -531,6 +553,11 @@ close_client_socket(NCR_Instance inst)
 
   SCH_RemoveTimeout(inst->rx_timeout_id);
   inst->rx_timeout_id = 0;
+
+  if (has_saved_response(inst)) {
+    SCH_RemoveTimeout(inst->saved_response->timeout_id);
+    inst->saved_response->timeout_id = 0;
+  }
 }
 
 /* ================================================== */
@@ -625,7 +652,7 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   result->auto_burst = params->burst;
   result->auto_offline = params->auto_offline;
   result->copy = params->copy && result->mode == MODE_CLIENT;
-  result->poll_target = params->poll_target;
+  result->poll_target = MAX(1, params->poll_target);
   result->ext_field_flags = params->ext_fields;
 
   if (params->nts) {
@@ -673,6 +700,8 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   else
     result->filter = NULL;
 
+  result->saved_response = NULL;
+
   result->rx_timeout_id = 0;
   result->tx_timeout_id = 0;
   result->tx_suspended = 1;
@@ -709,6 +738,9 @@ NCR_DestroyInstance(NCR_Instance instance)
   if (instance->filter)
     SPF_DestroyInstance(instance->filter);
 
+  if (instance->saved_response)
+    Free(instance->saved_response);
+
   NAU_DestroyInstance(instance->auth);
 
   /* This will destroy the source instance inside the
@@ -774,12 +806,14 @@ NCR_ResetInstance(NCR_Instance instance)
 void
 NCR_ResetPoll(NCR_Instance instance)
 {
+  instance->poll_score = 0.0;
+
   if (instance->local_poll != instance->minpoll) {
     instance->local_poll = instance->minpoll;
 
     /* The timer was set with a longer poll interval, restart it */
     if (instance->tx_timeout_id)
-      restart_timeout(instance, get_transmit_delay(instance, 0, 0.0));
+      restart_timeout(instance, get_transmit_delay(instance, 0));
   }
 }
 
@@ -804,6 +838,12 @@ NCR_ChangeRemoteAddress(NCR_Instance inst, NTP_Remote_Address *remote_addr, int
     inst->local_addr.sock_fd = NIO_OpenServerSocket(remote_addr);
   }
 
+  /* Reset the polling interval only if the source wasn't unreachable to
+     avoid increasing server/network load in case that is what caused
+     the source to be unreachable */
+  if (SRC_IsReachable(inst->source))
+    NCR_ResetPoll(inst);
+
   /* Update the reference ID and reset the source/sourcestats instances */
   SRC_SetRefid(inst->source, UTI_IPToRefid(&remote_addr->ip_addr),
                &inst->remote_addr.ip_addr);
@@ -900,10 +940,19 @@ get_transmit_poll(NCR_Instance inst)
 /* ================================================== */
 
 static double
-get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx)
+get_transmit_delay(NCR_Instance inst, int on_tx)
 {
   int poll_to_use, stratum_diff;
-  double delay_time;
+  double delay_time, last_tx;
+  struct timespec now;
+
+  /* Calculate the interval since last transmission if known */
+  if (!on_tx && !UTI_IsZeroTimespec(&inst->local_tx.ts)) {
+    SCH_GetLastEventTime(&now, NULL, NULL);
+    last_tx = UTI_DiffTimespecsToDouble(&now, &inst->local_tx.ts);
+  } else {
+    last_tx = 0;
+  }
 
   /* If we're in burst mode, queue for immediate dispatch.
 
@@ -943,12 +992,6 @@ get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx)
                last_tx / delay_time > PEER_SAMPLING_ADJ - 0.5))
             delay_time *= PEER_SAMPLING_ADJ;
 
-          /* Substract the already spend time */
-          if (last_tx > 0.0)
-            delay_time -= last_tx;
-          if (delay_time < 0.0)
-            delay_time = 0.0;
-
           break;
         default:
           assert(0);
@@ -966,6 +1009,12 @@ get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx)
       break;
   }
 
+  /* Subtract elapsed time */
+  if (last_tx > 0.0)
+    delay_time -= last_tx;
+  if (delay_time < 0.0)
+    delay_time = 0.0;
+
   return delay_time;
 }
 
@@ -1004,34 +1053,64 @@ receive_timeout(void *arg)
 /* ================================================== */
 
 static int
-add_ext_exp1(NTP_Packet *message, NTP_PacketInfo *info, struct timespec *rx,
-             double root_delay, double root_dispersion)
+add_ef_mono_root(NTP_Packet *message, NTP_PacketInfo *info, struct timespec *rx,
+                 double root_delay, double root_dispersion)
 {
   struct timespec mono_rx;
-  NTP_ExtFieldExp1 exp1;
+  NTP_EFExpMonoRoot ef;
   NTP_int64 ts_fuzz;
 
-  memset(&exp1, 0, sizeof (exp1));
-  exp1.magic = htonl(NTP_EF_EXP1_MAGIC);
+  memset(&ef, 0, sizeof (ef));
+  ef.magic = htonl(NTP_EF_EXP_MONO_ROOT_MAGIC);
 
   if (info->mode != MODE_CLIENT) {
-    exp1.root_delay = UTI_DoubleToNtp32f28(root_delay);
-    exp1.root_dispersion = UTI_DoubleToNtp32f28(root_dispersion);
+    ef.root_delay = UTI_DoubleToNtp32f28(root_delay);
+    ef.root_dispersion = UTI_DoubleToNtp32f28(root_dispersion);
     if (rx)
       UTI_AddDoubleToTimespec(rx, server_mono_offset, &mono_rx);
     else
       UTI_ZeroTimespec(&mono_rx);
     UTI_GetNtp64Fuzz(&ts_fuzz, message->precision);
-    UTI_TimespecToNtp64(&mono_rx, &exp1.mono_receive_ts, &ts_fuzz);
-    exp1.mono_epoch = htonl(server_mono_epoch);
+    UTI_TimespecToNtp64(&mono_rx, &ef.mono_receive_ts, &ts_fuzz);
+    ef.mono_epoch = htonl(server_mono_epoch);
   }
 
-  if (!NEF_AddField(message, info, NTP_EF_EXP1, &exp1, sizeof (exp1))) {
+  if (!NEF_AddField(message, info, NTP_EF_EXP_MONO_ROOT, &ef, sizeof (ef))) {
     DEBUG_LOG("Could not add EF");
     return 0;
   }
 
-  info->ext_field_flags |= NTP_EF_FLAG_EXP1;
+  info->ext_field_flags |= NTP_EF_FLAG_EXP_MONO_ROOT;
+
+  return 1;
+}
+
+/* ================================================== */
+
+static int
+add_ef_net_correction(NTP_Packet *message, NTP_PacketInfo *info,
+                      NTP_Local_Timestamp *local_rx)
+{
+  NTP_EFExpNetCorrection ef;
+
+  if (CNF_GetPtpPort() == 0) {
+    DEBUG_LOG("ptpport disabled");
+    return 1;
+  }
+
+  memset(&ef, 0, sizeof (ef));
+  ef.magic = htonl(NTP_EF_EXP_NET_CORRECTION_MAGIC);
+
+  if (info->mode != MODE_CLIENT && local_rx->net_correction > local_rx->rx_duration) {
+    UTI_DoubleToNtp64(local_rx->net_correction, &ef.correction);
+  }
+
+  if (!NEF_AddField(message, info, NTP_EF_EXP_NET_CORRECTION, &ef, sizeof (ef))) {
+    DEBUG_LOG("Could not add EF");
+    return 0;
+  }
+
+  info->ext_field_flags |= NTP_EF_FLAG_EXP_NET_CORRECTION;
 
   return 1;
 }
@@ -1183,9 +1262,13 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     return 0;
 
   if (ext_field_flags) {
-    if (ext_field_flags & NTP_EF_FLAG_EXP1) {
-      if (!add_ext_exp1(&message, &info, smooth_time ? NULL : &local_receive,
-                        our_root_delay, our_root_dispersion))
+    if (ext_field_flags & NTP_EF_FLAG_EXP_MONO_ROOT) {
+      if (!add_ef_mono_root(&message, &info, smooth_time ? NULL : &local_receive,
+                            our_root_delay, our_root_dispersion))
+        return 0;
+    }
+    if (ext_field_flags & NTP_EF_FLAG_EXP_NET_CORRECTION) {
+      if (!add_ef_net_correction(&message, &info, local_rx))
         return 0;
     }
   }
@@ -1256,6 +1339,8 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     local_tx->ts = local_transmit;
     local_tx->err = local_transmit_err;
     local_tx->source = NTP_TS_DAEMON;
+    local_tx->rx_duration = 0.0;
+    local_tx->net_correction = 0.0;
   }
 
   if (local_ntp_rx)
@@ -1278,6 +1363,15 @@ transmit_timeout(void *arg)
 
   inst->tx_timeout_id = 0;
 
+  if (has_saved_response(inst)) {
+    process_saved_response(inst);
+
+    /* Wait for the new transmission timeout (if the response was still
+       valid and it did not cause switch to offline) */
+    if (inst->tx_timeout_id != 0)
+      return;
+  }
+
   switch (inst->opmode) {
     case MD_BURST_WAS_ONLINE:
       /* With online burst switch to online before last packet */
@@ -1309,11 +1403,10 @@ transmit_timeout(void *arg)
 
   /* Prepare authentication */
   if (!NAU_PrepareRequestAuth(inst->auth)) {
-    if (inst->burst_total_samples_to_go > 0)
-      inst->burst_total_samples_to_go--;
-    adjust_poll(inst, 0.25);
     SRC_UpdateReachability(inst->source, 0);
-    restart_timeout(inst, get_transmit_delay(inst, 1, 0.0));
+    restart_timeout(inst, get_transmit_delay(inst, 1));
+    /* Count missing samples for the sample filter */
+    process_sample(inst, NULL);
     return;
   }
 
@@ -1416,7 +1509,7 @@ transmit_timeout(void *arg)
   }
 
   /* Restart timer for this message */
-  restart_timeout(inst, get_transmit_delay(inst, 1, 0.0));
+  restart_timeout(inst, get_transmit_delay(inst, 1));
 
   /* 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
@@ -1441,6 +1534,14 @@ is_zero_data(unsigned char *data, int length)
 
 /* ================================================== */
 
+static int
+is_exp_ef(void *body, int body_length, int expected_body_length, uint32_t magic)
+{
+  return body_length == expected_body_length && *(uint32_t *)body == htonl(magic);
+}
+
+/* ================================================== */
+
 static int
 parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info)
 {
@@ -1527,10 +1628,15 @@ parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info)
       case NTP_EF_NTS_AUTH_AND_EEF:
         info->auth.mode = NTP_AUTH_NTS;
         break;
-      case NTP_EF_EXP1:
-        if (ef_body_length == sizeof (NTP_ExtFieldExp1) &&
-            ntohl(((NTP_ExtFieldExp1 *)ef_body)->magic) == NTP_EF_EXP1_MAGIC)
-          info->ext_field_flags |= NTP_EF_FLAG_EXP1;
+      case NTP_EF_EXP_MONO_ROOT:
+        if (is_exp_ef(ef_body, ef_body_length, sizeof (NTP_EFExpMonoRoot),
+                      NTP_EF_EXP_MONO_ROOT_MAGIC))
+          info->ext_field_flags |= NTP_EF_FLAG_EXP_MONO_ROOT;
+        break;
+      case NTP_EF_EXP_NET_CORRECTION:
+        if (is_exp_ef(ef_body, ef_body_length, sizeof (NTP_EFExpNetCorrection),
+                      NTP_EF_EXP_NET_CORRECTION_MAGIC))
+          info->ext_field_flags |= NTP_EF_FLAG_EXP_NET_CORRECTION;
         break;
       default:
         DEBUG_LOG("Unknown extension field type=%x", (unsigned int)ef_type);
@@ -1558,6 +1664,53 @@ parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info)
 
 /* ================================================== */
 
+static void
+apply_net_correction(NTP_Sample *sample, NTP_Local_Timestamp *rx, NTP_Local_Timestamp *tx,
+                     double precision)
+{
+  double rx_correction, tx_correction, low_delay_correction;
+
+  /* Require some correction from transparent clocks to be present
+     in both directions (not just the local RX timestamp correction) */
+  if (rx->net_correction <= rx->rx_duration || tx->net_correction <= 0.0)
+    return;
+
+  /* With perfect corrections from PTP transparent clocks and short cables
+     the peer delay would be close to zero, or even negative if the server or
+     transparent clocks were running faster than client, which would invert the
+     sample weighting.  Adjust the correction to get a delay corresponding to
+     a direct connection to the server.  For simplicity, assume the TX and RX
+     link speeds are equal.  If not, the reported delay will be wrong, but it
+     will not cause an error in the offset. */
+  rx_correction = rx->net_correction - rx->rx_duration;
+  tx_correction = tx->net_correction - rx->rx_duration;
+
+  /* Use a slightly smaller value in the correction of delay to not overcorrect
+     if the transparent clocks run up to 100 ppm fast and keep a part of the
+     uncorrected delay for the sample weighting */
+  low_delay_correction = (rx_correction + tx_correction) *
+                         (1.0 - MAX_NET_CORRECTION_FREQ);
+
+  /* Make sure the correction is sane.  The values are not authenticated! */
+  if (low_delay_correction < 0.0 || low_delay_correction > sample->peer_delay) {
+    DEBUG_LOG("Invalid correction %.9f peer_delay=%.9f",
+              low_delay_correction, sample->peer_delay);
+    return;
+  }
+
+  /* Correct the offset and peer delay, but not the root delay to not
+     change the estimated maximum error */
+  sample->offset += (rx_correction - tx_correction) / 2.0;
+  sample->peer_delay -= low_delay_correction;
+  if (sample->peer_delay < precision)
+    sample->peer_delay = precision;
+
+  DEBUG_LOG("Applied correction rx=%.9f tx=%.9f dur=%.9f",
+            rx->net_correction, tx->net_correction, rx->rx_duration);
+}
+
+/* ================================================== */
+
 static int
 check_delay_ratio(NCR_Instance inst, SST_Stats stats,
                 struct timespec *sample_time, double delay)
@@ -1729,7 +1882,69 @@ process_sample(NCR_Instance inst, NTP_Sample *sample)
 /* ================================================== */
 
 static int
-process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
+has_saved_response(NCR_Instance inst)
+{
+  return inst->saved_response && inst->saved_response->timeout_id > 0;
+}
+
+/* ================================================== */
+
+static void
+process_saved_response(NCR_Instance inst)
+{
+  SCH_RemoveTimeout(inst->saved_response->timeout_id);
+  inst->saved_response->timeout_id = 0;
+
+  DEBUG_LOG("Processing saved response from %s", UTI_IPToString(&inst->remote_addr.ip_addr));
+  process_response(inst, 1, &inst->saved_response->local_addr, &inst->saved_response->rx_ts,
+                   &inst->saved_response->message, &inst->saved_response->info);
+}
+
+/* ================================================== */
+
+static void
+saved_response_timeout(void *arg)
+{
+  NCR_Instance inst = arg;
+
+  inst->saved_response->timeout_id = 0;
+  process_saved_response(inst);
+}
+
+/* ================================================== */
+
+static int
+save_response(NCR_Instance inst, NTP_Local_Address *local_addr,
+              NTP_Local_Timestamp *rx_ts, NTP_Packet *message, NTP_PacketInfo *info)
+{
+  double timeout = CNF_GetHwTsTimeout();
+
+  if (timeout <= 0.0)
+    return 0;
+
+  /* If another message is already saved, process both immediately */
+  if (has_saved_response(inst)) {
+    process_saved_response(inst);
+    return 0;
+  }
+
+  if (!inst->saved_response)
+    inst->saved_response = MallocNew(struct SavedResponse);
+  inst->saved_response->local_addr = *local_addr;
+  inst->saved_response->rx_ts = *rx_ts;
+  inst->saved_response->message = *message;
+  inst->saved_response->info = *info;
+  inst->saved_response->timeout_id = SCH_AddTimeoutByDelay(timeout, saved_response_timeout,
+                                                           inst);
+  DEBUG_LOG("Saved valid response for later processing");
+
+  return 1;
+}
+
+/* ================================================== */
+
+static int
+process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
                  NTP_Local_Timestamp *rx_ts, NTP_Packet *message, NTP_PacketInfo *info)
 {
   NTP_Sample sample;
@@ -1757,18 +1972,20 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   /* Extension fields */
   int parsed, ef_length, ef_type, ef_body_length;
   void *ef_body;
-  NTP_ExtFieldExp1 *ef_exp1;
+  NTP_EFExpMonoRoot *ef_mono_root;
+  NTP_EFExpNetCorrection *ef_net_correction;
 
   NTP_Local_Timestamp local_receive, local_transmit;
   double remote_interval, local_interval, response_time;
-  double delay_time, precision, mono_doffset;
+  double delay_time, precision, mono_doffset, net_correction;
   int updated_timestamps;
 
   /* ==================== */
 
   stats = SRC_GetSourcestats(inst->source);
 
-  ef_exp1 = NULL;
+  ef_mono_root = NULL;
+  ef_net_correction = NULL;
 
   /* Find requested non-authentication extension fields */
   if (inst->ext_field_flags & info->ext_field_flags) {
@@ -1778,11 +1995,17 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
         break;
 
       switch (ef_type) {
-        case NTP_EF_EXP1:
-          if (inst->ext_field_flags & NTP_EF_FLAG_EXP1 &&
-              ef_body_length == sizeof (*ef_exp1) &&
-              ntohl(((NTP_ExtFieldExp1 *)ef_body)->magic) == NTP_EF_EXP1_MAGIC)
-            ef_exp1 = ef_body;
+        case NTP_EF_EXP_MONO_ROOT:
+          if (inst->ext_field_flags & NTP_EF_FLAG_EXP_MONO_ROOT &&
+              is_exp_ef(ef_body, ef_body_length, sizeof (*ef_mono_root),
+                        NTP_EF_EXP_MONO_ROOT_MAGIC))
+            ef_mono_root = ef_body;
+          break;
+        case NTP_EF_EXP_NET_CORRECTION:
+          if (inst->ext_field_flags & NTP_EF_FLAG_EXP_NET_CORRECTION &&
+              is_exp_ef(ef_body, ef_body_length, sizeof (*ef_net_correction),
+                        NTP_EF_EXP_NET_CORRECTION_MAGIC))
+            ef_net_correction = ef_body;
           break;
       }
     }
@@ -1791,9 +2014,9 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   pkt_leap = NTP_LVM_TO_LEAP(message->lvm);
   pkt_version = NTP_LVM_TO_VERSION(message->lvm);
   pkt_refid = ntohl(message->reference_id);
-  if (ef_exp1) {
-    pkt_root_delay = UTI_Ntp32f28ToDouble(ef_exp1->root_delay);
-    pkt_root_dispersion = UTI_Ntp32f28ToDouble(ef_exp1->root_dispersion);
+  if (ef_mono_root) {
+    pkt_root_delay = UTI_Ntp32f28ToDouble(ef_mono_root->root_delay);
+    pkt_root_dispersion = UTI_Ntp32f28ToDouble(ef_mono_root->root_dispersion);
   } else {
     pkt_root_delay = UTI_Ntp32ToDouble(message->root_delay);
     pkt_root_dispersion = UTI_Ntp32ToDouble(message->root_dispersion);
@@ -1823,8 +2046,10 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   /* Test 4 would check for denied access.  It would always pass as this
      function is called only for known sources. */
 
-  /* Test 5 checks for authentication failure */
-  test5 = NAU_CheckResponseAuth(inst->auth, message, info);
+  /* Test 5 checks for authentication failure.  If it is a saved message,
+     which had to pass all these tests before, avoid authenticating it for
+     the second time (that is not allowed in the NTS code). */
+  test5 = saved || NAU_CheckResponseAuth(inst->auth, message, info);
 
   /* Test 6 checks for unsynchronised server */
   test6 = pkt_leap != LEAP_Unsynchronised &&
@@ -1840,6 +2065,20 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   valid_packet = test1 && test2 && test3 && test5;
   synced_packet = valid_packet && test6 && test7;
 
+  /* If the server is very close and/or the NIC hardware/driver is slow, it
+     is possible that a response from the server is received before the HW
+     transmit timestamp of the request.  To avoid getting a less accurate
+     offset or failing one of the later tests, save the response and wait for
+     the transmit timestamp or timeout.  Allow this only for the first valid
+     response to the request, when at least one good response has already been
+     accepted to avoid incorrectly confirming a tentative source. */
+  if (valid_packet && synced_packet && !saved && !inst->valid_rx &&
+      NIO_IsHwTsEnabled() && inst->local_tx.source != NTP_TS_HARDWARE &&
+      inst->report.total_good_count > 0) {
+    if (save_response(inst, local_addr, rx_ts, message, info))
+      return 1;
+  }
+
   /* Check for Kiss-o'-Death codes */
   kod_rate = 0;
   if (test1 && test2 && test5 && pkt_leap == LEAP_Unsynchronised &&
@@ -1862,11 +2101,11 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
        the new sample.  In the interleaved mode, cancel the correction out in
        remote timestamps of the previous request and response, which were
        captured before the source accumulated the new time corrections. */
-    if (ef_exp1 && inst->remote_mono_epoch == ntohl(ef_exp1->mono_epoch) &&
-        !UTI_IsZeroNtp64(&ef_exp1->mono_receive_ts) &&
+    if (ef_mono_root && inst->remote_mono_epoch == ntohl(ef_mono_root->mono_epoch) &&
+        !UTI_IsZeroNtp64(&ef_mono_root->mono_receive_ts) &&
         !UTI_IsZeroNtp64(&inst->remote_ntp_monorx)) {
       mono_doffset =
-          UTI_DiffNtp64ToDouble(&ef_exp1->mono_receive_ts, &inst->remote_ntp_monorx) -
+          UTI_DiffNtp64ToDouble(&ef_mono_root->mono_receive_ts, &inst->remote_ntp_monorx) -
           UTI_DiffNtp64ToDouble(&message->receive_ts, &inst->remote_ntp_rx);
       if (fabs(mono_doffset) > MAX_MONO_DOFFSET)
         mono_doffset = 0.0;
@@ -1874,6 +2113,12 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
       mono_doffset = 0.0;
     }
 
+    if (ef_net_correction) {
+      net_correction = UTI_Ntp64ToDouble(&ef_net_correction->correction);
+    } else {
+      net_correction = 0.0;
+    }
+
     /* Select remote and local timestamps for the new sample */
     if (interleaved_packet) {
       /* Prefer previous local TX and remote RX timestamps if it will make
@@ -1893,6 +2138,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
         UTI_Ntp64ToTimespec(&message->receive_ts, &remote_receive);
         UTI_Ntp64ToTimespec(&inst->remote_ntp_rx, &remote_request_receive);
         local_transmit = inst->local_tx;
+        local_transmit.net_correction = net_correction;
         root_delay = MAX(pkt_root_delay, inst->remote_root_delay);
         root_dispersion = MAX(pkt_root_dispersion, inst->remote_root_dispersion);
       }
@@ -1907,6 +2153,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
       remote_request_receive = remote_receive;
       local_receive = *rx_ts;
       local_transmit = inst->local_tx;
+      local_transmit.net_correction = net_correction;
       root_delay = pkt_root_delay;
       root_dispersion = pkt_root_dispersion;
     }
@@ -1950,6 +2197,9 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
                              skew * fabs(local_interval);
     sample.root_delay = root_delay + sample.peer_delay;
     sample.root_dispersion = root_dispersion + sample.peer_dispersion;
+
+    /* Apply corrections from PTP transparent clocks if available and sane */
+    apply_net_correction(&sample, &local_receive, &local_transmit, precision);
     
     /* If the source is an active peer, this is the minimum assumed interval
        between previous two transmissions (if not constrained by minpoll) */
@@ -1958,8 +2208,10 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
 
     /* Additional tests required to pass before accumulating the sample */
 
-    /* Test A requires that the minimum estimate of the peer delay is not
-       larger than the configured maximum, in both client modes that the server
+    /* Test A combines multiple tests to avoid changing the measurements log
+       format and ntpdata report.  It requires that the minimum estimate of the
+       peer delay is not larger than the configured maximum, it is not a
+       response in the 'warm up' exchange, in both client modes that the server
        processing time is sane, in interleaved client/server mode that the
        previous response was not in basic mode (which prevents using timestamps
        that minimise delay error), and in interleaved symmetric mode that the
@@ -1967,6 +2219,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
        a missed response */
     testA = sample.peer_delay - sample.peer_dispersion <= inst->max_delay &&
             precision <= inst->max_delay &&
+            inst->presend_done <= 0 &&
             !(inst->mode == MODE_CLIENT && response_time > MAX_SERVER_INTERVAL) &&
             !(inst->mode == MODE_CLIENT && interleaved_packet &&
               UTI_IsZeroTimespec(&inst->prev_local_tx.ts) &&
@@ -2005,6 +2258,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
     sample.root_delay = sample.root_dispersion = 0.0;
     sample.time = rx_ts->ts;
     mono_doffset = 0.0;
+    net_correction = 0.0;
     local_receive = *rx_ts;
     local_transmit = inst->local_tx;
     testA = testB = testC = testD = 0;
@@ -2038,9 +2292,9 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
     /* If available, update the monotonic timestamp and accumulate the offset.
        This needs to be done here to not lose changes in remote_ntp_rx in
        symmetric mode when there are multiple responses per request. */
-    if (ef_exp1 && !UTI_IsZeroNtp64(&ef_exp1->mono_receive_ts)) {
-      inst->remote_mono_epoch = ntohl(ef_exp1->mono_epoch);
-      inst->remote_ntp_monorx = ef_exp1->mono_receive_ts;
+    if (ef_mono_root && !UTI_IsZeroNtp64(&ef_mono_root->mono_receive_ts)) {
+      inst->remote_mono_epoch = ntohl(ef_mono_root->mono_epoch);
+      inst->remote_ntp_monorx = ef_mono_root->mono_receive_ts;
       inst->mono_doffset += mono_doffset;
     } else {
       inst->remote_mono_epoch = 0;
@@ -2048,8 +2302,11 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
       inst->mono_doffset = 0.0;
     }
 
-    /* Don't use the same set of timestamps for the next sample */
-    if (interleaved_packet)
+    inst->local_tx.net_correction = net_correction;
+
+    /* Avoid reusing timestamps of an accumulated sample when switching
+       from basic mode to interleaved mode */
+    if (interleaved_packet || !good_packet)
       inst->prev_local_tx = inst->local_tx;
     else
       zero_local_timestamp(&inst->prev_local_tx);
@@ -2068,15 +2325,11 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   /* Accept at most one response per request.  The NTP specification recommends
      resetting local_ntp_tx to make the following packets fail test2 or test3,
      but that would not allow the code above to make multiple updates of the
-     timestamps in symmetric mode.  Also, ignore presend responses. */
+     timestamps in symmetric mode. */
   if (inst->valid_rx) {
     test2 = test3 = 0;
     valid_packet = synced_packet = good_packet = 0;
   } else if (valid_packet) {
-    if (inst->presend_done) {
-      testA = 0;
-      good_packet = 0;
-    }
     inst->valid_rx = 1;
   }
 
@@ -2170,8 +2423,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
 
     /* And now, requeue the timer */
     if (inst->opmode != MD_OFFLINE) {
-      delay_time = get_transmit_delay(inst, 0,
-                     UTI_DiffTimespecsToDouble(&inst->local_rx.ts, &inst->local_tx.ts));
+      delay_time = get_transmit_delay(inst, 0);
 
       if (kod_rate) {
         LOG(LOGS_WARN, "Received KoD RATE from %s",
@@ -2186,7 +2438,8 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
       }
 
       /* Get rid of old timeout and start a new one */
-      assert(inst->tx_timeout_id);
+      if (!saved)
+        assert(inst->tx_timeout_id);
       restart_timeout(inst, delay_time);
     }
 
@@ -2331,8 +2584,8 @@ NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
          client mode operation.
 
          This copes with the case for an isolated network where one
-         machine is set by eye and is used as the master, with the
-         other machines pointed at it.  If the master goes down, we
+         machine is set by eye and is used as the primary server, with
+         the other machines pointed at it.  If the server goes down, we
          want to be able to reset its time at startup by relying on
          one of the secondaries to flywheel it. The behaviour coded here
          is required in the secondaries to make this possible. */
@@ -2375,7 +2628,7 @@ NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
       return 0;
     }
 
-    return process_response(inst, local_addr, rx_ts, message, &info);
+    return process_response(inst, 0, local_addr, rx_ts, message, &info);
   } else if (proc_as_unknown) {
     NCR_ProcessRxUnknown(&inst->remote_addr, local_addr, rx_ts, message, length);
     /* It's not a reply to our request, don't return success */
@@ -2456,8 +2709,6 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
     /* Don't respond unless a non-zero KoD was returned */
     if (kod == 0)
       return;
-  } else if (info.auth.mode != NTP_AUTH_NONE && info.auth.mode != NTP_AUTH_MSSNTP) {
-    CLG_LogAuthNtpRequest();
   }
 
   local_ntp_rx = NULL;
@@ -2477,14 +2728,18 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
       UTI_CompareNtp64(&message->receive_ts, &message->transmit_ts) != 0) {
     ntp_rx = message->originate_ts;
     local_ntp_rx = &ntp_rx;
-    UTI_ZeroTimespec(&local_tx.ts);
-    interleaved = CLG_GetNtpTxTimestamp(&ntp_rx, &local_tx.ts);
+    zero_local_timestamp(&local_tx);
+    interleaved = CLG_GetNtpTxTimestamp(&ntp_rx, &local_tx.ts, &local_tx.source);
 
     tx_ts = &local_tx;
     if (interleaved)
       CLG_DisableNtpTimestamps(&ntp_rx);
   }
 
+  CLG_UpdateNtpStats(kod != 0 && info.auth.mode != NTP_AUTH_NONE &&
+                     info.auth.mode != NTP_AUTH_MSSNTP,
+                     rx_ts->source, interleaved ? tx_ts->source : NTP_TS_DAEMON);
+
   /* Suggest the client to increase its polling interval if it indicates
      the interval is shorter than the rate limiting interval */
   poll = CLG_GetNtpMinPoll();
@@ -2501,7 +2756,7 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
     return;
 
   if (local_ntp_rx)
-    CLG_SaveNtpTimestamps(local_ntp_rx, tx_ts ? &tx_ts->ts : NULL);
+    CLG_SaveNtpTimestamps(local_ntp_rx, &tx_ts->ts, tx_ts->source);
 }
 
 /* ================================================== */
@@ -2555,6 +2810,11 @@ NCR_ProcessTxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
 
   update_tx_timestamp(&inst->local_tx, tx_ts, &inst->local_ntp_rx, &inst->local_ntp_tx,
                       message);
+
+  if (tx_ts->source == NTP_TS_HARDWARE) {
+    if (has_saved_response(inst))
+      process_saved_response(inst);
+  }
 }
 
 /* ================================================== */
@@ -2579,7 +2839,7 @@ NCR_ProcessTxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
   local_ntp_rx = &message->receive_ts;
   new_tx = *tx_ts;
 
-  if (!CLG_GetNtpTxTimestamp(local_ntp_rx, &old_tx.ts))
+  if (!CLG_GetNtpTxTimestamp(local_ntp_rx, &old_tx.ts, &old_tx.source))
     return;
 
   /* Undo a clock adjustment between the RX and TX timestamps to minimise error
@@ -2588,7 +2848,7 @@ NCR_ProcessTxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
 
   update_tx_timestamp(&old_tx, &new_tx, local_ntp_rx, NULL, message);
 
-  CLG_UpdateNtpTxTimestamp(local_ntp_rx, &new_tx.ts);
+  CLG_UpdateNtpTxTimestamp(local_ntp_rx, &new_tx.ts, new_tx.source);
 }
 
 /* ================================================== */
@@ -2611,6 +2871,10 @@ NCR_SlewTimes(NCR_Instance inst, struct timespec *when, double dfreq, double dof
 
   if (inst->filter)
     SPF_SlewSamples(inst->filter, when, dfreq, doffset);
+
+  if (has_saved_response(inst))
+    UTI_AdjustTimespec(&inst->saved_response->rx_ts.ts, when, &inst->saved_response->rx_ts.ts,
+                       &delta, dfreq, doffset);
 }
 
 /* ================================================== */
@@ -2756,7 +3020,7 @@ NCR_ModifyMinstratum(NCR_Instance inst, int new_min_stratum)
 void
 NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target)
 {
-  inst->poll_target = new_poll_target;
+  inst->poll_target = MAX(1, new_poll_target);
   LOG(LOGS_INFO, "Source %s new polltarget %d",
       UTI_IPToString(&inst->remote_addr.ip_addr), new_poll_target);
 }
@@ -2856,6 +3120,10 @@ NCR_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all)
   if (status != ADF_SUCCESS)
     return 0;
 
+  LOG(LOG_GetContextSeverity(LOGC_Command), "%s%s %s access from %s",
+      allow ? "Allowed" : "Denied", all ? " all" : "", "NTP",
+      UTI_IPSubnetToString(ip_addr, subnet_bits));
+
   /* Keep server sockets open only when an address allowed */
   if (allow) {
     NTP_Remote_Address remote_addr;

ntp_core.h

@@ -38,16 +38,12 @@ typedef enum {
   NTP_SERVER, NTP_PEER
 } NTP_Source_Type;
 
-typedef enum {
-  NTP_TS_DAEMON = 0,
-  NTP_TS_KERNEL,
-  NTP_TS_HARDWARE
-} NTP_Timestamp_Source;
-
 typedef struct {
   struct timespec ts;
   double err;
   NTP_Timestamp_Source source;
+  double rx_duration;
+  double net_correction;
 } NTP_Local_Timestamp;
 
 /* This is a private data type used for storing the instance record for

ntp_io.c

@@ -126,8 +126,14 @@ open_socket(int family, int local_port, int client_only, IPSockAddr *remote_addr
   dscp = CNF_GetNtpDscp();
   if (dscp > 0 && dscp < 64) {
 #ifdef IP_TOS
-    if (!SCK_SetIntOption(sock_fd, IPPROTO_IP, IP_TOS, dscp << 2))
-      ;
+    if (family == IPADDR_INET4)
+      if (!SCK_SetIntOption(sock_fd, IPPROTO_IP, IP_TOS, dscp << 2))
+        ;
+#endif
+#if defined(FEAT_IPV6) && defined(IPV6_TCLASS)
+    if (family == IPADDR_INET6)
+      if (!SCK_SetIntOption(sock_fd, IPPROTO_IPV6, IPV6_TCLASS, dscp << 2))
+        ;
 #endif
   }
 
@@ -163,9 +169,6 @@ close_socket(int sock_fd)
   if (sock_fd == INVALID_SOCK_FD)
     return;
 
-#ifdef HAVE_LINUX_TIMESTAMPING
-  NIO_Linux_NotifySocketClosing(sock_fd);
-#endif
   SCH_RemoveFileHandler(sock_fd);
   SCK_CloseSocket(sock_fd);
 }
@@ -275,6 +278,18 @@ NIO_Finalise(void)
 
 /* ================================================== */
 
+int
+NIO_IsHwTsEnabled(void)
+{
+#ifdef HAVE_LINUX_TIMESTAMPING
+  return NIO_Linux_IsHwTsEnabled();
+#else
+  return 0;
+#endif
+}
+
+/* ================================================== */
+
 int
 NIO_OpenClientSocket(NTP_Remote_Address *remote_addr)
 {
@@ -416,6 +431,9 @@ process_message(SCK_Message *message, int sock_fd, int event)
 
   SCH_GetLastEventTime(&local_ts.ts, &local_ts.err, NULL);
   local_ts.source = NTP_TS_DAEMON;
+  local_ts.rx_duration = 0.0;
+  local_ts.net_correction = 0.0;
+
   sched_ts = local_ts.ts;
 
   if (message->addr_type != SCK_ADDR_IP) {
@@ -441,7 +459,7 @@ process_message(SCK_Message *message, int sock_fd, int event)
     DEBUG_LOG("Updated RX timestamp delay=%.9f tss=%u",
               UTI_DiffTimespecsToDouble(&sched_ts, &local_ts.ts), local_ts.source);
 
-  if (!NIO_UnwrapMessage(message, sock_fd))
+  if (!NIO_UnwrapMessage(message, sock_fd, &local_ts.net_correction))
     return;
 
   /* Just ignore the packet if it's not of a recognized length */
@@ -461,11 +479,6 @@ read_from_socket(int sock_fd, int event, void *anything)
   SCK_Message *messages;
   int i, received, flags = 0;
 
-#ifdef HAVE_LINUX_TIMESTAMPING
-  if (NIO_Linux_ProcessEvent(sock_fd, event))
-    return;
-#endif
-
   if (event == SCH_FILE_EXCEPTION) {
 #ifdef HAVE_LINUX_TIMESTAMPING
     flags |= SCK_FLAG_MSG_ERRQUEUE;
@@ -485,8 +498,9 @@ read_from_socket(int sock_fd, int event, void *anything)
 /* ================================================== */
 
 int
-NIO_UnwrapMessage(SCK_Message *message, int sock_fd)
+NIO_UnwrapMessage(SCK_Message *message, int sock_fd, double *net_correction)
 {
+  double ptp_correction;
   PTP_NtpMessage *msg;
 
   if (!is_ptp_socket(sock_fd))
@@ -512,7 +526,14 @@ NIO_UnwrapMessage(SCK_Message *message, int sock_fd)
   message->data = (char *)message->data + PTP_NTP_PREFIX_LENGTH;
   message->length -= PTP_NTP_PREFIX_LENGTH;
 
-  DEBUG_LOG("Unwrapped PTP->NTP len=%d", message->length);
+  ptp_correction = UTI_Integer64NetworkToHost(*(Integer64 *)msg->header.correction) /
+                   ((1 << 16) * 1.0e9);
+
+  /* Use the correction only if the RX duration is known (i.e. HW timestamp) */
+  if (*net_correction > 0.0)
+    *net_correction += ptp_correction;
+
+  DEBUG_LOG("Unwrapped PTP->NTP len=%d corr=%.9f", message->length, ptp_correction);
 
   return 1;
 }
@@ -522,6 +543,8 @@ NIO_UnwrapMessage(SCK_Message *message, int sock_fd)
 static int
 wrap_message(SCK_Message *message, int sock_fd)
 {
+  static uint16_t sequence_id = 0;
+
   assert(PTP_NTP_PREFIX_LENGTH == 48);
 
   if (!is_ptp_socket(sock_fd))
@@ -542,6 +565,7 @@ wrap_message(SCK_Message *message, int sock_fd)
   ptp_message->header.length = htons(PTP_NTP_PREFIX_LENGTH + message->length);
   ptp_message->header.domain = PTP_DOMAIN_NTP;
   ptp_message->header.flags = htons(PTP_FLAG_UNICAST);
+  ptp_message->header.sequence_id = htons(sequence_id++);
   ptp_message->tlv_header.type = htons(PTP_TLV_NTP);
   ptp_message->tlv_header.length = htons(message->length);
   memcpy((char *)ptp_message + PTP_NTP_PREFIX_LENGTH, message->data, message->length);

ntp_io.h

@@ -39,6 +39,9 @@ extern void NIO_Initialise(void);
 /* Function to finalise the module */
 extern void NIO_Finalise(void);
 
+/* Function to check if HW timestamping is enabled on any interface */
+extern int NIO_IsHwTsEnabled(void);
+
 /* Function to obtain a socket for sending client packets */
 extern int NIO_OpenClientSocket(NTP_Remote_Address *remote_addr);
 
@@ -61,7 +64,7 @@ extern int NIO_IsServerSocketOpen(void);
 extern int NIO_IsServerConnectable(NTP_Remote_Address *remote_addr);
 
 /* Function to unwrap an NTP message from non-native transport (e.g. PTP) */
-extern int NIO_UnwrapMessage(SCK_Message *message, int sock_fd);
+extern int NIO_UnwrapMessage(SCK_Message *message, int sock_fd, double *net_correction);
 
 /* Function to transmit a packet */
 extern int NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,

ntp_io_linux.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2016-2019, 2021-2022
+ * Copyright (C) Miroslav Lichvar  2016-2019, 2021-2023
  * 
  * 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 +39,7 @@
 #include "hwclock.h"
 #include "local.h"
 #include "logging.h"
+#include "memory.h"
 #include "ntp_core.h"
 #include "ntp_io.h"
 #include "ntp_io_linux.h"
@@ -63,13 +64,16 @@ struct Interface {
   double tx_comp;
   double rx_comp;
   HCL_Instance clock;
+  int maxpoll;
+  SCH_TimeoutID poll_timeout_id;
 };
 
 /* Number of PHC readings per HW clock sample */
 #define PHC_READINGS 25
 
-/* Minimum interval between PHC readings */
+/* Minimum and maximum interval between PHC readings */
 #define MIN_PHC_POLL -6
+#define MAX_PHC_POLL 20
 
 /* Maximum acceptable offset between SW/HW and daemon timestamp */
 #define MAX_TS_DELAY 1.0
@@ -84,19 +88,6 @@ static int ts_tx_flags;
 /* Flag indicating the socket options can't be changed in control messages */
 static int permanent_ts_options;
 
-/* When sending client requests to a close and fast server, it is possible that
-   a response will be received before the HW transmit timestamp of the request
-   itself.  To avoid processing of the response without the HW timestamp, we
-   monitor events returned by select() and suspend reading of packets from the
-   receive queue for up to 200 microseconds.  As the requests are normally
-   separated by at least 200 milliseconds, it is sufficient to monitor and
-   suspend one socket at a time. */
-static int monitored_socket;
-static int suspended_socket;
-static SCH_TimeoutID resume_timeout_id;
-
-#define RESUME_TIMEOUT 200.0e-6
-
 /* Unbound socket keeping the kernel RX timestamping permanently enabled
    in order to avoid a race condition between receiving a server response
    and the kernel actually starting to timestamp received packets after
@@ -107,13 +98,17 @@ static int dummy_rxts_socket;
 
 /* ================================================== */
 
+static void poll_phc(struct Interface *iface, struct timespec *now);
+
+/* ================================================== */
+
 static int
 add_interface(CNF_HwTsInterface *conf_iface)
 {
+  int sock_fd, if_index, minpoll, phc_fd, req_hwts_flags, rx_filter;
   struct ethtool_ts_info ts_info;
   struct hwtstamp_config ts_config;
   struct ifreq req;
-  int sock_fd, if_index, phc_fd, req_hwts_flags, rx_filter;
   unsigned int i;
   struct Interface *iface;
 
@@ -245,9 +240,15 @@ add_interface(CNF_HwTsInterface *conf_iface)
   iface->tx_comp = conf_iface->tx_comp;
   iface->rx_comp = conf_iface->rx_comp;
 
+  minpoll = CLAMP(MIN_PHC_POLL, conf_iface->minpoll, MAX_PHC_POLL);
   iface->clock = HCL_CreateInstance(conf_iface->min_samples, conf_iface->max_samples,
-                                    UTI_Log2ToDouble(MAX(conf_iface->minpoll, MIN_PHC_POLL)),
-                                    conf_iface->precision);
+                                    UTI_Log2ToDouble(minpoll), conf_iface->precision);
+
+  iface->maxpoll = CLAMP(minpoll, conf_iface->maxpoll, MAX_PHC_POLL);
+
+  /* Do not schedule the first poll timeout here!  The argument (interface) can
+     move until all interfaces are added.  Wait for the first HW timestamp. */
+  iface->poll_timeout_id = 0;
 
   LOG(LOGS_INFO, "Enabled HW timestamping %son %s",
       ts_config.rx_filter == HWTSTAMP_FILTER_NONE ? "(TX only) " : "", iface->name);
@@ -412,8 +413,6 @@ NIO_Linux_Initialise(void)
   /* Kernels before 4.7 ignore timestamping flags set in control messages */
   permanent_ts_options = !SYS_Linux_CheckKernelVersion(4, 7);
 
-  monitored_socket = INVALID_SOCK_FD;
-  suspended_socket = INVALID_SOCK_FD;
   dummy_rxts_socket = INVALID_SOCK_FD;
 }
 
@@ -430,6 +429,7 @@ NIO_Linux_Finalise(void)
 
   for (i = 0; i < ARR_GetSize(interfaces); i++) {
     iface = ARR_GetElement(interfaces, i);
+    SCH_RemoveTimeout(iface->poll_timeout_id);
     HCL_DestroyInstance(iface->clock);
     close(iface->phc_fd);
   }
@@ -439,6 +439,14 @@ NIO_Linux_Finalise(void)
 
 /* ================================================== */
 
+int
+NIO_Linux_IsHwTsEnabled(void)
+{
+  return ARR_GetSize(interfaces) > 0;
+}
+
+/* ================================================== */
+
 int
 NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events)
 {
@@ -472,73 +480,6 @@ NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events)
 
 /* ================================================== */
 
-static void
-resume_socket(int sock_fd)
-{
-  if (monitored_socket == sock_fd)
-    monitored_socket = INVALID_SOCK_FD;
-
-  if (sock_fd == INVALID_SOCK_FD || sock_fd != suspended_socket)
-    return;
-
-  suspended_socket = INVALID_SOCK_FD;
-
-  SCH_SetFileHandlerEvent(sock_fd, SCH_FILE_INPUT, 1);
-
-  DEBUG_LOG("Resumed RX processing %s timeout fd=%d",
-            resume_timeout_id ? "before" : "on", sock_fd);
-
-  if (resume_timeout_id) {
-    SCH_RemoveTimeout(resume_timeout_id);
-    resume_timeout_id = 0;
-  }
-}
-
-/* ================================================== */
-
-static void
-resume_timeout(void *arg)
-{
-  resume_timeout_id = 0;
-  resume_socket(suspended_socket);
-}
-
-/* ================================================== */
-
-static void
-suspend_socket(int sock_fd)
-{
-  resume_socket(suspended_socket);
-
-  suspended_socket = sock_fd;
-
-  SCH_SetFileHandlerEvent(suspended_socket, SCH_FILE_INPUT, 0);
-  resume_timeout_id = SCH_AddTimeoutByDelay(RESUME_TIMEOUT, resume_timeout, NULL);
-
-  DEBUG_LOG("Suspended RX processing fd=%d", sock_fd);
-}
-
-/* ================================================== */
-
-int
-NIO_Linux_ProcessEvent(int sock_fd, int event)
-{
-  if (sock_fd != monitored_socket)
-    return 0;
-
-  if (event == SCH_FILE_INPUT) {
-    suspend_socket(monitored_socket);
-    monitored_socket = INVALID_SOCK_FD;
-
-    /* Don't process the message yet */
-    return 1;
-  }
-
-  return 0;
-}
-
-/* ================================================== */
-
 static struct Interface *
 get_interface(int if_index)
 {
@@ -558,29 +499,70 @@ get_interface(int if_index)
 
 /* ================================================== */
 
+static void
+poll_timeout(void *arg)
+{
+  struct Interface *iface = arg;
+  struct timespec now;
+
+  iface->poll_timeout_id = 0;
+
+  SCH_GetLastEventTime(&now, NULL, NULL);
+  poll_phc(iface, &now);
+}
+
+/* ================================================== */
+
+static void
+poll_phc(struct Interface *iface, struct timespec *now)
+{
+  struct timespec sample_phc_ts, sample_sys_ts, sample_local_ts;
+  struct timespec phc_readings[PHC_READINGS][3];
+  double phc_err, local_err, interval;
+  int n_readings;
+
+  if (!HCL_NeedsNewSample(iface->clock, now))
+    return;
+
+  DEBUG_LOG("Polling PHC on %s%s",
+            iface->name, iface->poll_timeout_id != 0 ? " before timeout" : "");
+
+  n_readings = SYS_Linux_GetPHCReadings(iface->phc_fd, iface->phc_nocrossts,
+                                        &iface->phc_mode, PHC_READINGS, phc_readings);
+
+  /* Add timeout for the next poll in case no HW timestamp will be captured
+     between the minpoll and maxpoll.  Separate reading of different PHCs to
+     avoid long intervals between handling I/O events. */
+  SCH_RemoveTimeout(iface->poll_timeout_id);
+  interval = UTI_Log2ToDouble(iface->maxpoll);
+  iface->poll_timeout_id = SCH_AddTimeoutInClass(interval, interval /
+                                                   ARR_GetSize(interfaces) / 4, 0.1,
+                                                 SCH_PhcPollClass, poll_timeout, iface);
+
+  if (n_readings <= 0)
+    return;
+
+  if (!HCL_ProcessReadings(iface->clock, n_readings, phc_readings,
+                           &sample_phc_ts, &sample_sys_ts, &phc_err))
+    return;
+
+  LCL_CookTime(&sample_sys_ts, &sample_local_ts, &local_err);
+  HCL_AccumulateSample(iface->clock, &sample_phc_ts, &sample_local_ts, phc_err + local_err);
+
+  update_interface_speed(iface);
+}
+
+/* ================================================== */
+
 static void
 process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
                      NTP_Local_Timestamp *local_ts, int rx_ntp_length, int family,
                      int l2_length)
 {
-  struct timespec sample_phc_ts, sample_sys_ts, sample_local_ts, ts;
-  struct timespec phc_readings[PHC_READINGS][3];
-  double rx_correction, ts_delay, phc_err, local_err;
-  int n_readings;
+  double rx_correction = 0.0, ts_delay, local_err;
+  struct timespec ts;
 
-  if (HCL_NeedsNewSample(iface->clock, &local_ts->ts)) {
-    n_readings = SYS_Linux_GetPHCReadings(iface->phc_fd, iface->phc_nocrossts,
-                                          &iface->phc_mode, PHC_READINGS, phc_readings);
-    if (n_readings > 0 &&
-        HCL_ProcessReadings(iface->clock, n_readings, phc_readings,
-                             &sample_phc_ts, &sample_sys_ts, &phc_err)) {
-      LCL_CookTime(&sample_sys_ts, &sample_local_ts, &local_err);
-      HCL_AccumulateSample(iface->clock, &sample_phc_ts, &sample_local_ts,
-                           phc_err + local_err);
-
-      update_interface_speed(iface);
-    }
-  }
+  poll_phc(iface, &local_ts->ts);
 
   /* We need to transpose RX timestamps as hardware timestamps are normally
      preamble timestamps and RX timestamps in NTP are supposed to be trailer
@@ -618,6 +600,10 @@ process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
   local_ts->ts = ts;
   local_ts->err = local_err;
   local_ts->source = NTP_TS_HARDWARE;
+  local_ts->rx_duration = rx_correction;
+  /* Network correction needs to include the RX duration to avoid
+     asymmetric correction with asymmetric link speeds */
+  local_ts->net_correction = rx_correction;
 }
 
 /* ================================================== */
@@ -741,6 +727,7 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
 {
   struct Interface *iface;
   int is_tx, ts_if_index, l2_length;
+  double c = 0.0;
 
   is_tx = event == SCH_FILE_EXCEPTION;
   iface = NULL;
@@ -758,11 +745,6 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
     } else {
       DEBUG_LOG("HW clock not found for interface %d", ts_if_index);
     }
-
-    /* If a HW transmit timestamp was received, resume processing
-       of non-error messages on this socket */
-    if (is_tx)
-      resume_socket(local_addr->sock_fd);
   }
 
   if (local_ts->source == NTP_TS_DAEMON && !UTI_IsZeroTimespec(&message->timestamp.kernel) &&
@@ -806,7 +788,7 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
     return 1;
   }
 
-  if (!NIO_UnwrapMessage(message, local_addr->sock_fd))
+  if (!NIO_UnwrapMessage(message, local_addr->sock_fd, &c))
     return 1;
 
   if (message->length < NTP_HEADER_LENGTH || message->length > sizeof (NTP_Packet))
@@ -825,23 +807,9 @@ NIO_Linux_RequestTxTimestamp(SCK_Message *message, int sock_fd)
   if (!ts_flags)
     return;
 
-  /* If a HW transmit timestamp is requested on a client socket, monitor
-     events on the socket in order to avoid processing of a fast response
-     without the HW timestamp of the request */
-  if (ts_tx_flags & SOF_TIMESTAMPING_TX_HARDWARE && !NIO_IsServerSocket(sock_fd))
-    monitored_socket = sock_fd;
-
   /* Check if TX timestamping is disabled on this socket */
   if (permanent_ts_options || !NIO_IsServerSocket(sock_fd))
     return;
 
   message->timestamp.tx_flags = ts_tx_flags;
 }
-
-/* ================================================== */
-
-void
-NIO_Linux_NotifySocketClosing(int sock_fd)
-{
-  resume_socket(sock_fd);
-}

ntp_io_linux.h

@@ -33,15 +33,13 @@ extern void NIO_Linux_Initialise(void);
 
 extern void NIO_Linux_Finalise(void);
 
-extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
+extern int NIO_Linux_IsHwTsEnabled(void);
 
-extern int NIO_Linux_ProcessEvent(int sock_fd, int event);
+extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
 
 extern int NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
                                     NTP_Local_Timestamp *local_ts, int event);
 
 extern void NIO_Linux_RequestTxTimestamp(SCK_Message *message, int sock_fd);
 
-extern void NIO_Linux_NotifySocketClosing(int sock_fd);
-
 #endif

ntp_sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2021
+ * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -32,6 +32,7 @@
 #include "sysincl.h"
 
 #include "array.h"
+#include "conf.h"
 #include "ntp_sources.h"
 #include "ntp_core.h"
 #include "ntp_io.h"
@@ -58,12 +59,15 @@ typedef struct {
   NCR_Instance data;            /* Data for the protocol engine for this source */
   char *name;                   /* Name of the source as it was specified
                                    (may be an IP address) */
+  IPAddr resolved_addr;         /* Address resolved from the name, which can be
+                                   different from remote_addr (e.g. NTS-KE) */
   int pool_id;                  /* ID of the pool from which was this source
                                    added or INVALID_POOL */
   int tentative;                /* Flag indicating there was no valid response
                                    received from the source yet */
   uint32_t conf_id;             /* Configuration ID, which can be shared with
                                    different sources in case of a pool */
+  double last_resolving;        /* Time of last name resolving (monotonic) */
 } SourceRecord;
 
 /* Hash table of SourceRecord, its size is a power of two and it's never
@@ -96,6 +100,9 @@ struct UnresolvedSource {
   char *name;
   /* Flag indicating addresses should be used in a random order */
   int random_order;
+  /* Flag indicating current address should be replaced only if it is
+     no longer returned by the resolver */
+  int refreshment;
   /* Next unresolved source in the list */
   struct UnresolvedSource *next;
 };
@@ -103,7 +110,7 @@ struct UnresolvedSource {
 #define RESOLVE_INTERVAL_UNIT 7
 #define MIN_RESOLVE_INTERVAL 2
 #define MAX_RESOLVE_INTERVAL 9
-#define MIN_REPLACEMENT_INTERVAL 8
+#define MAX_REPLACEMENT_INTERVAL 9
 
 static struct UnresolvedSource *unresolved_sources = NULL;
 static int resolving_interval = 0;
@@ -184,6 +191,7 @@ void
 NSR_Initialise(void)
 {
   n_sources = 0;
+  resolving_id = 0;
   initialised = 1;
 
   records = ARR_CreateInstance(sizeof (SourceRecord));
@@ -206,6 +214,7 @@ NSR_Finalise(void)
   ARR_DestroyInstance(records);
   ARR_DestroyInstance(pools);
 
+  SCH_RemoveTimeout(resolving_id);
   while (unresolved_sources)
     remove_unresolved_source(unresolved_sources);
 
@@ -317,6 +326,31 @@ rehash_records(void)
 
 /* ================================================== */
 
+static void
+log_source(SourceRecord *record, int addition, int once_per_pool)
+{
+  int pool, log_addr;
+  char *ip_str;
+
+  if (once_per_pool && record->pool_id != INVALID_POOL) {
+    if (get_pool(record->pool_id)->sources > 1)
+      return;
+    pool = 1;
+    log_addr = 0;
+  } else {
+    ip_str = UTI_IPToString(&record->remote_addr->ip_addr);
+    pool = 0;
+    log_addr = strcmp(record->name, ip_str) != 0;
+  }
+
+  LOG(LOG_GetContextSeverity(LOGC_Command | LOGC_SourceFile), "%s %s %s%s%s%s",
+      addition ? "Added" : "Removed", pool ? "pool" : "source",
+      log_addr ? ip_str : record->name,
+      log_addr ? " (" : "", log_addr ? record->name : "", log_addr ? ")" : "");
+}
+
+/* ================================================== */
+
 /* Procedure to add a new source */
 static NSR_Status
 add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
@@ -356,9 +390,11 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
       record->name = Strdup(name ? name : UTI_IPToString(&remote_addr->ip_addr));
       record->data = NCR_CreateInstance(remote_addr, type, params, record->name);
       record->remote_addr = NCR_GetRemoteAddress(record->data);
+      record->resolved_addr = remote_addr->ip_addr;
       record->pool_id = pool_id;
       record->tentative = 1;
       record->conf_id = conf_id;
+      record->last_resolving = SCH_GetLastEventMonoTime();
 
       record_lock = 0;
 
@@ -371,6 +407,8 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
       if (auto_start_sources && UTI_IsIPReal(&remote_addr->ip_addr))
         NCR_StartInstance(record->data);
 
+      log_source(record, 1, 1);
+
       /* The new instance is allowed to change its address immediately */
       handle_saved_address_update();
 
@@ -405,6 +443,8 @@ change_source_address(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr
 
   record = get_record(slot1);
   NCR_ChangeRemoteAddress(record->data, new_addr, !replacement);
+  if (replacement)
+    record->resolved_addr = new_addr->ip_addr;
 
   if (record->remote_addr != NCR_GetRemoteAddress(record->data) ||
       UTI_CompareIPs(&record->remote_addr->ip_addr, &new_addr->ip_addr, NULL) != 0)
@@ -488,7 +528,21 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
   NTP_Remote_Address old_addr, new_addr;
   SourceRecord *record;
   unsigned short first = 0;
-  int i, j;
+  int i, j, slot;
+
+  /* Keep using the current address if it is being refreshed and it is
+     still included in the resolved addresses */
+  if (us->refreshment) {
+    assert(us->pool_id == INVALID_POOL);
+
+    for (i = 0; i < n_addrs; i++) {
+      if (find_slot2(&us->address, &slot) == 2 &&
+          UTI_CompareIPs(&get_record(slot)->resolved_addr, &ip_addrs[i], NULL) == 0) {
+        DEBUG_LOG("%s still fresh", UTI_IPToString(&us->address.ip_addr));
+        return;
+      }
+    }
+  }
 
   if (us->random_order)
     UTI_GetRandomBytes(&first, sizeof (first));
@@ -746,6 +800,7 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(name);
   us->random_order = 0;
+  us->refreshment = 0;
 
   remote_addr.ip_addr.family = IPADDR_ID;
   remote_addr.ip_addr.addr.id = ++last_address_id;
@@ -789,6 +844,31 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
 
 /* ================================================== */
 
+const char *
+NSR_StatusToString(NSR_Status status)
+{
+  switch (status) {
+    case NSR_Success:
+      return "Success";
+    case NSR_NoSuchSource:
+      return "No such source";
+    case NSR_AlreadyInUse:
+      return "Already in use";
+    case NSR_TooManySources:
+      return "Too many sources";
+    case NSR_InvalidAF:
+      return "Invalid address";
+    case NSR_InvalidName:
+      return "Invalid name";
+    case NSR_UnresolvedName:
+      return "Unresolved name";
+    default:
+      return "?";
+  }
+}
+
+/* ================================================== */
+
 void
 NSR_SetSourceResolvingEndHandler(NSR_SourceResolvingEndHandler handler)
 {
@@ -884,6 +964,7 @@ NSR_RemoveSource(IPAddr *address)
   if (find_slot(address, &slot) == 0)
     return NSR_NoSuchSource;
 
+  log_source(get_record(slot), 0, 0);
   clean_source_record(get_record(slot));
 
   /* Rehash the table to make sure there are no broken probe sequences.
@@ -906,6 +987,7 @@ NSR_RemoveSourcesById(uint32_t conf_id)
     record = get_record(i);
     if (!record->remote_addr || record->conf_id != conf_id)
       continue;
+    log_source(record, 0, 1);
     clean_source_record(record);
   }
 
@@ -933,20 +1015,23 @@ NSR_RemoveAllSources(void)
 /* ================================================== */
 
 static void
-resolve_source_replacement(SourceRecord *record)
+resolve_source_replacement(SourceRecord *record, int refreshment)
 {
   struct UnresolvedSource *us;
 
-  DEBUG_LOG("trying to replace %s (%s)",
+  DEBUG_LOG("%s %s (%s)", refreshment ? "refreshing" : "trying to replace",
             UTI_IPToString(&record->remote_addr->ip_addr), record->name);
 
+  record->last_resolving = SCH_GetLastEventMonoTime();
+
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(record->name);
-  /* 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;
+  /* Ignore the order of addresses from the resolver to not get
+     stuck with a pair of unreachable or otherwise unusable servers
+     (e.g. falsetickers) in case the order doesn't change, or a group
+     of servers if they are ordered by IP family */
+  us->random_order = 1;
+  us->refreshment = refreshment;
   us->pool_id = INVALID_POOL;
   us->address = *record->remote_addr;
 
@@ -959,11 +1044,11 @@ resolve_source_replacement(SourceRecord *record)
 void
 NSR_HandleBadSource(IPAddr *address)
 {
-  static struct timespec last_replacement;
-  struct timespec now;
+  static double next_replacement = 0.0;
   SourceRecord *record;
   IPAddr ip_addr;
-  double diff;
+  uint32_t rnd;
+  double now;
   int slot;
 
   if (!find_slot(address, &slot))
@@ -978,15 +1063,56 @@ NSR_HandleBadSource(IPAddr *address)
     return;
 
   /* Don't resolve names too frequently */
-  SCH_GetLastEventTime(NULL, NULL, &now);
-  diff = UTI_DiffTimespecsToDouble(&now, &last_replacement);
-  if (fabs(diff) < RESOLVE_INTERVAL_UNIT * (1 << MIN_REPLACEMENT_INTERVAL)) {
+  now = SCH_GetLastEventMonoTime();
+  if (now < next_replacement) {
     DEBUG_LOG("replacement postponed");
     return;
   }
-  last_replacement = now;
 
-  resolve_source_replacement(record);
+  UTI_GetRandomBytes(&rnd, sizeof (rnd));
+  next_replacement = now + ((double)rnd / (uint32_t)-1) *
+                     (RESOLVE_INTERVAL_UNIT * (1 << MAX_REPLACEMENT_INTERVAL));
+
+  resolve_source_replacement(record, 0);
+}
+
+/* ================================================== */
+
+static void
+maybe_refresh_source(void)
+{
+  static double last_refreshment = 0.0;
+  SourceRecord *record, *oldest_record;
+  int i, min_interval;
+  double now;
+
+  min_interval = CNF_GetRefresh();
+
+  now = SCH_GetLastEventMonoTime();
+  if (min_interval <= 0 || now < last_refreshment + min_interval)
+    return;
+
+  last_refreshment = now;
+
+  for (i = 0, oldest_record = NULL; i < ARR_GetSize(records); i++) {
+    record = get_record(i);
+    if (!record->remote_addr || UTI_IsStringIP(record->name))
+      continue;
+
+    if (!oldest_record || oldest_record->last_resolving > record->last_resolving)
+      oldest_record = record;
+  }
+
+  if (!oldest_record)
+    return;
+
+  /* Check if the name wasn't already resolved in the last interval */
+  if (now < oldest_record->last_resolving + min_interval) {
+    last_refreshment = oldest_record->last_resolving;
+    return;
+  }
+
+  resolve_source_replacement(oldest_record, 1);
 }
 
 /* ================================================== */
@@ -1002,7 +1128,7 @@ NSR_RefreshAddresses(void)
     if (!record->remote_addr)
       continue;
 
-    resolve_source_replacement(record);
+    resolve_source_replacement(record, 1);
   }
 }
 
@@ -1128,6 +1254,8 @@ NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
           remove_pool_sources(record->pool_id, 1, 0);
       }
     }
+
+    maybe_refresh_source();
   } else {
     NCR_ProcessRxUnknown(remote_addr, local_addr, rx_ts, message, length);
   }

ntp_sources.h

@@ -60,6 +60,8 @@ extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type
 extern NSR_Status NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
                                       SourceParameters *params, uint32_t *conf_id);
 
+extern const char *NSR_StatusToString(NSR_Status status);
+
 /* Function type for handlers to be called back when an attempt
  * (possibly unsuccessful) to resolve unresolved sources ends */
 typedef void (*NSR_SourceResolvingEndHandler)(void);

nts_ke_client.c

@@ -102,16 +102,22 @@ static int
 prepare_request(NKC_Instance inst)
 {
   NKSN_Instance session = inst->session;
-  uint16_t datum;
+  uint16_t data[2];
+  int length;
 
   NKSN_BeginMessage(session);
 
-  datum = htons(NKE_NEXT_PROTOCOL_NTPV4);
-  if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, &datum, sizeof (datum)))
+  data[0] = htons(NKE_NEXT_PROTOCOL_NTPV4);
+  if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, data, sizeof (data[0])))
     return 0;
 
-  datum = htons(AEAD_AES_SIV_CMAC_256);
-  if (!NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, &datum, sizeof (datum)))
+  length = 0;
+  if (SIV_GetKeyLength(AEAD_AES_128_GCM_SIV) > 0)
+    data[length++] = htons(AEAD_AES_128_GCM_SIV);
+  if (SIV_GetKeyLength(AEAD_AES_SIV_CMAC_256) > 0)
+    data[length++] = htons(AEAD_AES_SIV_CMAC_256);
+  if (!NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, data,
+                      length * sizeof (data[0])))
     return 0;
 
   if (!NKSN_EndMessage(session))
@@ -159,12 +165,14 @@ process_response(NKC_Instance inst)
         next_protocol = NKE_NEXT_PROTOCOL_NTPV4;
         break;
       case NKE_RECORD_AEAD_ALGORITHM:
-        if (length != 2 || ntohs(data[0]) != AEAD_AES_SIV_CMAC_256) {
+        if (length != 2 || (ntohs(data[0]) != AEAD_AES_SIV_CMAC_256 &&
+                            ntohs(data[0]) != AEAD_AES_128_GCM_SIV) ||
+            SIV_GetKeyLength(ntohs(data[0])) <= 0) {
           DEBUG_LOG("Unexpected NTS-KE AEAD algorithm");
           error = 1;
           break;
         }
-        aead_algorithm = AEAD_AES_SIV_CMAC_256;
+        aead_algorithm = ntohs(data[0]);
         inst->context.algorithm = aead_algorithm;
         break;
       case NKE_RECORD_ERROR:
@@ -236,7 +244,7 @@ process_response(NKC_Instance inst)
 
   if (error || inst->num_cookies == 0 ||
       next_protocol != NKE_NEXT_PROTOCOL_NTPV4 ||
-      aead_algorithm != AEAD_AES_SIV_CMAC_256)
+      aead_algorithm < 0)
     return 0;
 
   return 1;
@@ -370,6 +378,13 @@ NKC_Start(NKC_Instance inst)
     return 0;
   }
 
+  /* Don't try to connect if missing the algorithm which all servers
+     are required to support */
+  if (SIV_GetKeyLength(AEAD_AES_SIV_CMAC_256) <= 0) {
+    LOG(LOGS_ERR, "Missing AES-SIV-CMAC-256");
+    return 0;
+  }
+
   /* Follow the bindacqaddress and bindacqdevice settings */
   CNF_GetBindAcquisitionAddress(inst->address.ip_addr.family, &local_addr.ip_addr);
   local_addr.port = 0;

nts_ke_server.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020
+ * Copyright (C) Miroslav Lichvar  2020, 2022
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -47,31 +47,33 @@
 
 #define SERVER_TIMEOUT 2.0
 
-#define SERVER_COOKIE_SIV AEAD_AES_SIV_CMAC_256
-#define SERVER_COOKIE_NONCE_LENGTH 16
+#define MAX_COOKIE_NONCE_LENGTH 16
 
 #define KEY_ID_INDEX_BITS 2
 #define MAX_SERVER_KEYS (1U << KEY_ID_INDEX_BITS)
 #define FUTURE_KEYS 1
 
 #define DUMP_FILENAME "ntskeys"
-#define DUMP_IDENTIFIER "NKS0\n"
+#define DUMP_IDENTIFIER "NKS1\n"
+#define OLD_DUMP_IDENTIFIER "NKS0\n"
 
 #define INVALID_SOCK_FD (-7)
 
 typedef struct {
   uint32_t key_id;
-  unsigned char nonce[SERVER_COOKIE_NONCE_LENGTH];
 } ServerCookieHeader;
 
 typedef struct {
   uint32_t id;
   unsigned char key[SIV_MAX_KEY_LENGTH];
+  SIV_Algorithm siv_algorithm;
   SIV_Instance siv;
+  int nonce_length;
 } ServerKey;
 
 typedef struct {
   uint32_t key_id;
+  uint32_t siv_algorithm;
   unsigned char key[SIV_MAX_KEY_LENGTH];
   IPAddr client_addr;
   uint16_t client_port;
@@ -148,12 +150,30 @@ handle_client(int sock_fd, IPSockAddr *addr)
 
 /* ================================================== */
 
+static void
+update_key_siv(ServerKey *key, SIV_Algorithm algorithm)
+{
+  if (!key->siv || key->siv_algorithm != algorithm) {
+    if (key->siv)
+      SIV_DestroyInstance(key->siv);
+    key->siv_algorithm = algorithm;
+    key->siv = SIV_CreateInstance(algorithm);
+    key->nonce_length = MIN(SIV_GetMaxNonceLength(key->siv), MAX_COOKIE_NONCE_LENGTH);
+  }
+
+  if (!key->siv || !SIV_SetKey(key->siv, key->key, SIV_GetKeyLength(key->siv_algorithm)))
+    LOG_FATAL("Could not set SIV key");
+}
+
+/* ================================================== */
+
 static void
 handle_helper_request(int fd, int event, void *arg)
 {
   SCK_Message *message;
   HelperRequest *req;
   IPSockAddr client_addr;
+  ServerKey *key;
   int sock_fd;
 
   /* Receive the helper request with the NTS-KE session socket.
@@ -181,16 +201,14 @@ handle_helper_request(int fd, int event, void *arg)
   req = message->data;
 
   /* Extract the current server key and client address from the request */
-  server_keys[current_server_key].id = ntohl(req->key_id);
-  assert(sizeof (server_keys[current_server_key].key) == sizeof (req->key));
-  memcpy(server_keys[current_server_key].key, req->key,
-         sizeof (server_keys[current_server_key].key));
+  key = &server_keys[current_server_key];
+  key->id = ntohl(req->key_id);
+  assert(sizeof (key->key) == sizeof (req->key));
+  memcpy(key->key, req->key, sizeof (key->key));
   UTI_IPNetworkToHost(&req->client_addr, &client_addr.ip_addr);
   client_addr.port = ntohs(req->client_port);
 
-  if (!SIV_SetKey(server_keys[current_server_key].siv, server_keys[current_server_key].key,
-                  SIV_GetKeyLength(SERVER_COOKIE_SIV)))
-    LOG_FATAL("Could not set SIV key");
+  update_key_siv(key, ntohl(req->siv_algorithm));
 
   if (!handle_client(sock_fd, &client_addr)) {
     SCK_CloseSocket(sock_fd);
@@ -240,6 +258,7 @@ accept_connection(int listening_fd, int event, void *arg)
 
     /* Include the current server key and client address in the request */
     req.key_id = htonl(server_keys[current_server_key].id);
+    req.siv_algorithm = htonl(server_keys[current_server_key].siv_algorithm);
     assert(sizeof (req.key) == sizeof (server_keys[current_server_key].key));
     memcpy(req.key, server_keys[current_server_key].key, sizeof (req.key));
     UTI_IPHostToNetwork(&addr.ip_addr, &req.client_addr);
@@ -427,8 +446,9 @@ process_request(NKSN_Instance session)
 
         for (i = 0; i < MIN(length, sizeof (data)) / 2; i++) {
           aead_algorithm_values++;
-          if (ntohs(data[i]) == AEAD_AES_SIV_CMAC_256)
-            aead_algorithm = AEAD_AES_SIV_CMAC_256;
+          /* Use the first supported algorithm */
+          if (aead_algorithm < 0 && SIV_GetKeyLength(ntohs(data[i])) > 0)
+            aead_algorithm = ntohs(data[i]);
         }
         break;
       case NKE_RECORD_ERROR:
@@ -470,28 +490,38 @@ handle_message(void *arg)
 static void
 generate_key(int index)
 {
+  SIV_Algorithm algorithm;
+  ServerKey *key;
   int key_length;
 
   if (index < 0 || index >= MAX_SERVER_KEYS)
     assert(0);
 
-  key_length = SIV_GetKeyLength(SERVER_COOKIE_SIV);
-  if (key_length > sizeof (server_keys[index].key))
+  /* Prefer AES-128-GCM-SIV if available.  Note that if older keys loaded
+     from ntsdumpdir use a different algorithm, responding to NTP requests
+     with cookies encrypted with those keys will not work if the new algorithm
+     produces longer cookies (i.e. response would be longer than request).
+     Switching from AES-SIV-CMAC-256 to AES-128-GCM-SIV is ok. */
+  algorithm = SIV_GetKeyLength(AEAD_AES_128_GCM_SIV) > 0 ?
+              AEAD_AES_128_GCM_SIV : AEAD_AES_SIV_CMAC_256;
+
+  key = &server_keys[index];
+
+  key_length = SIV_GetKeyLength(algorithm);
+  if (key_length > sizeof (key->key))
     assert(0);
 
-  UTI_GetRandomBytesUrandom(server_keys[index].key, key_length);
-
-  if (!server_keys[index].siv ||
-      !SIV_SetKey(server_keys[index].siv, server_keys[index].key, key_length))
-    LOG_FATAL("Could not set SIV key");
-
-  UTI_GetRandomBytes(&server_keys[index].id, sizeof (server_keys[index].id));
+  UTI_GetRandomBytesUrandom(key->key, key_length);
+  memset(key->key + key_length, 0, sizeof (key->key) - key_length);
+  UTI_GetRandomBytes(&key->id, sizeof (key->id));
 
   /* Encode the index in the lowest bits of the ID */
-  server_keys[index].id &= -1U << KEY_ID_INDEX_BITS;
-  server_keys[index].id |= index;
+  key->id &= -1U << KEY_ID_INDEX_BITS;
+  key->id |= index;
 
-  DEBUG_LOG("Generated server key %"PRIX32, server_keys[index].id);
+  update_key_siv(key, algorithm);
+
+  DEBUG_LOG("Generated key %08"PRIX32" (%d)", key->id, (int)key->siv_algorithm);
 
   last_server_key_ts = SCH_GetLastEventMonoTime();
 }
@@ -519,18 +549,19 @@ save_keys(void)
   if (!f)
     return;
 
-  key_length = SIV_GetKeyLength(SERVER_COOKIE_SIV);
   last_key_age = SCH_GetLastEventMonoTime() - last_server_key_ts;
 
-  if (fprintf(f, "%s%d %.1f\n", DUMP_IDENTIFIER, SERVER_COOKIE_SIV, last_key_age) < 0)
+  if (fprintf(f, "%s%.1f\n", DUMP_IDENTIFIER, last_key_age) < 0)
     goto error;
 
   for (i = 0; i < MAX_SERVER_KEYS; i++) {
     index = (current_server_key + i + 1 + FUTURE_KEYS) % MAX_SERVER_KEYS;
+    key_length = SIV_GetKeyLength(server_keys[index].siv_algorithm);
 
     if (key_length > sizeof (server_keys[index].key) ||
         !UTI_BytesToHex(server_keys[index].key, key_length, buf, sizeof (buf)) ||
-        fprintf(f, "%08"PRIX32" %s\n", server_keys[index].id, buf) < 0)
+        fprintf(f, "%08"PRIX32" %s %d\n", server_keys[index].id, buf,
+                (int)server_keys[index].siv_algorithm) < 0)
       goto error;
   }
 
@@ -545,7 +576,7 @@ save_keys(void)
   return;
 
 error:
-  DEBUG_LOG("Could not %s server keys", "save");
+  LOG(LOGS_ERR, "Could not %s %s", "save", "server NTS keys");
   fclose(f);
 
   if (!UTI_RemoveFile(dump_dir, DUMP_FILENAME, NULL))
@@ -554,17 +585,16 @@ error:
 
 /* ================================================== */
 
-#define MAX_WORDS 2
+#define MAX_WORDS 3
 
 static int
 load_keys(void)
 {
+  int i, index, key_length, algorithm = 0, old_ver;
   char *dump_dir, line[1024], *words[MAX_WORDS];
-  unsigned char key[SIV_MAX_KEY_LENGTH];
-  int i, index, key_length, algorithm;
+  ServerKey new_keys[MAX_SERVER_KEYS];
   double key_age;
   FILE *f;
-  uint32_t id;
 
   dump_dir = CNF_GetNtsDumpDir();
   if (!dump_dir)
@@ -574,43 +604,58 @@ load_keys(void)
   if (!f)
     return 0;
 
-  if (!fgets(line, sizeof (line), f) || strcmp(line, DUMP_IDENTIFIER) != 0 ||
-      !fgets(line, sizeof (line), f) || UTI_SplitString(line, words, MAX_WORDS) != 2 ||
-        sscanf(words[0], "%d", &algorithm) != 1 || algorithm != SERVER_COOKIE_SIV ||
-        sscanf(words[1], "%lf", &key_age) != 1)
+  if (!fgets(line, sizeof (line), f) ||
+      (strcmp(line, DUMP_IDENTIFIER) != 0 && strcmp(line, OLD_DUMP_IDENTIFIER) != 0))
     goto error;
 
-  key_length = SIV_GetKeyLength(SERVER_COOKIE_SIV);
-  last_server_key_ts = SCH_GetLastEventMonoTime() - MAX(key_age, 0.0);
+  old_ver = strcmp(line, DUMP_IDENTIFIER) != 0;
+
+  if (!fgets(line, sizeof (line), f) ||
+      UTI_SplitString(line, words, MAX_WORDS) != (old_ver ? 2 : 1) ||
+      (old_ver && sscanf(words[0], "%d", &algorithm) != 1) ||
+      sscanf(words[old_ver ? 1 : 0], "%lf", &key_age) != 1)
+    goto error;
 
   for (i = 0; i < MAX_SERVER_KEYS && fgets(line, sizeof (line), f); i++) {
-    if (UTI_SplitString(line, words, MAX_WORDS) != 2 ||
-        sscanf(words[0], "%"PRIX32, &id) != 1)
+    if (UTI_SplitString(line, words, MAX_WORDS) != (old_ver ? 2 : 3) ||
+        sscanf(words[0], "%"PRIX32, &new_keys[i].id) != 1 ||
+        (!old_ver && sscanf(words[2], "%d", &algorithm) != 1))
       goto error;
 
-    if (UTI_HexToBytes(words[1], key, sizeof (key)) != key_length)
+    new_keys[i].siv_algorithm = algorithm;
+    key_length = SIV_GetKeyLength(algorithm);
+
+    if ((i > 0 && (new_keys[i].id - new_keys[i - 1].id) % MAX_SERVER_KEYS != 1) ||
+        key_length <= 0 ||
+        UTI_HexToBytes(words[1], new_keys[i].key, sizeof (new_keys[i].key)) != key_length)
       goto error;
-
-    index = id % MAX_SERVER_KEYS;
-
-    server_keys[index].id = id;
-    assert(sizeof (server_keys[index].key) == sizeof (key));
-    memcpy(server_keys[index].key, key, key_length);
-
-    if (!SIV_SetKey(server_keys[index].siv, server_keys[index].key, key_length))
-      LOG_FATAL("Could not set SIV key");
-
-    DEBUG_LOG("Loaded key %"PRIX32, id);
-
-    current_server_key = (index + MAX_SERVER_KEYS - FUTURE_KEYS) % MAX_SERVER_KEYS;
+    memset(new_keys[i].key + key_length, 0, sizeof (new_keys[i].key) - key_length);
   }
 
+  if (i < MAX_SERVER_KEYS)
+    goto error;
+
+  for (i = 0; i < MAX_SERVER_KEYS; i++) {
+    index = new_keys[i].id % MAX_SERVER_KEYS;
+    server_keys[index].id = new_keys[i].id;
+    memcpy(server_keys[index].key, new_keys[i].key, sizeof (server_keys[index].key));
+
+    update_key_siv(&server_keys[index], new_keys[i].siv_algorithm);
+
+    DEBUG_LOG("Loaded key %08"PRIX32" (%d)",
+              server_keys[index].id, (int)server_keys[index].siv_algorithm);
+  }
+
+  current_server_key = (index + MAX_SERVER_KEYS - FUTURE_KEYS) % MAX_SERVER_KEYS;
+  last_server_key_ts = SCH_GetLastEventMonoTime() - MAX(key_age, 0.0);
+
   fclose(f);
 
+  LOG(LOGS_INFO, "Loaded %s", "server NTS keys");
   return 1;
 
 error:
-  DEBUG_LOG("Could not %s server keys", "load");
+  LOG(LOGS_ERR, "Could not %s %s", "load", "server NTS keys");
   fclose(f);
 
   return 0;
@@ -640,6 +685,8 @@ run_helper(uid_t uid, gid_t gid, int scfilter_level)
 
   DEBUG_LOG("Helper started");
 
+  SCK_CloseReusableSockets();
+
   /* Suppress a log message about disabled clock control */
   log_severity = LOG_GetMinSeverity();
   LOG_SetMinSeverity(LOGS_ERR);
@@ -759,7 +806,7 @@ NKS_Initialise(void)
   /* Generate random keys, even if they will be replaced by reloaded keys,
      or unused (in the helper) */
   for (i = 0; i < MAX_SERVER_KEYS; i++) {
-    server_keys[i].siv = SIV_CreateInstance(SERVER_COOKIE_SIV);
+    server_keys[i].siv = NULL;
     generate_key(i);
   }
 
@@ -779,6 +826,11 @@ NKS_Initialise(void)
       key_delay = key_rotation_interval - (SCH_GetLastEventMonoTime() - last_server_key_ts);
       SCH_AddTimeoutByDelay(MAX(key_delay, 0.0), key_timeout, NULL);
     }
+
+    /* Warn if keys are not saved, which can cause a flood of requests
+       after server restart */
+    if (!CNF_GetNtsDumpDir())
+      LOG(LOGS_WARN, "No ntsdumpdir to save server keys");
   }
 
   initialised = 1;
@@ -852,7 +904,7 @@ NKS_ReloadKeys(void)
 int
 NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
 {
-  unsigned char plaintext[2 * NKE_MAX_KEY_LENGTH], *ciphertext;
+  unsigned char *nonce, plaintext[2 * NKE_MAX_KEY_LENGTH], *ciphertext;
   int plaintext_length, tag_length;
   ServerCookieHeader *header;
   ServerKey *key;
@@ -862,14 +914,12 @@ NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
     return 0;
   }
 
-  /* The algorithm is hardcoded for now */
-  if (context->algorithm != AEAD_AES_SIV_CMAC_256) {
-    DEBUG_LOG("Unexpected SIV algorithm");
-    return 0;
-  }
+  /* The AEAD ID is not encoded in the cookie.  It is implied from the key
+     length (as long as only algorithms with different key lengths are
+     supported). */
 
   if (context->c2s.length < 0 || context->c2s.length > NKE_MAX_KEY_LENGTH ||
-      context->s2c.length < 0 || context->s2c.length > NKE_MAX_KEY_LENGTH) {
+      context->s2c.length != context->c2s.length) {
     DEBUG_LOG("Invalid key length");
     return 0;
   }
@@ -879,7 +929,11 @@ NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
   header = (ServerCookieHeader *)cookie->cookie;
 
   header->key_id = htonl(key->id);
-  UTI_GetRandomBytes(header->nonce, sizeof (header->nonce));
+
+  nonce = cookie->cookie + sizeof (*header);
+  if (key->nonce_length > sizeof (cookie->cookie) - sizeof (*header))
+    assert(0);
+  UTI_GetRandomBytes(nonce, key->nonce_length);
 
   plaintext_length = context->c2s.length + context->s2c.length;
   assert(plaintext_length <= sizeof (plaintext));
@@ -887,11 +941,11 @@ NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
   memcpy(plaintext + context->c2s.length, context->s2c.key, context->s2c.length);
 
   tag_length = SIV_GetTagLength(key->siv);
-  cookie->length = sizeof (*header) + plaintext_length + tag_length;
+  cookie->length = sizeof (*header) + key->nonce_length + plaintext_length + tag_length;
   assert(cookie->length <= sizeof (cookie->cookie));
-  ciphertext = cookie->cookie + sizeof (*header);
+  ciphertext = cookie->cookie + sizeof (*header) + key->nonce_length;
 
-  if (!SIV_Encrypt(key->siv, header->nonce, sizeof (header->nonce),
+  if (!SIV_Encrypt(key->siv, nonce, key->nonce_length,
                    "", 0,
                    plaintext, plaintext_length,
                    ciphertext, plaintext_length + tag_length)) {
@@ -907,7 +961,7 @@ NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
 int
 NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context)
 {
-  unsigned char plaintext[2 * NKE_MAX_KEY_LENGTH], *ciphertext;
+  unsigned char *nonce, plaintext[2 * NKE_MAX_KEY_LENGTH], *ciphertext;
   int ciphertext_length, plaintext_length, tag_length;
   ServerCookieHeader *header;
   ServerKey *key;
@@ -924,8 +978,6 @@ NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context)
   }
 
   header = (ServerCookieHeader *)cookie->cookie;
-  ciphertext = cookie->cookie + sizeof (*header);
-  ciphertext_length = cookie->length - sizeof (*header);
 
   key_id = ntohl(header->key_id);
   key = &server_keys[key_id % MAX_SERVER_KEYS];
@@ -935,18 +987,23 @@ NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context)
   }
 
   tag_length = SIV_GetTagLength(key->siv);
-  if (tag_length >= ciphertext_length) {
+
+  if (cookie->length <= (int)sizeof (*header) + key->nonce_length + tag_length) {
     DEBUG_LOG("Invalid cookie length");
     return 0;
   }
 
+  nonce = cookie->cookie + sizeof (*header);
+  ciphertext = cookie->cookie + sizeof (*header) + key->nonce_length;
+  ciphertext_length = cookie->length - sizeof (*header) - key->nonce_length;
   plaintext_length = ciphertext_length - tag_length;
+
   if (plaintext_length > sizeof (plaintext) || plaintext_length % 2 != 0) {
     DEBUG_LOG("Invalid cookie length");
     return 0;
   }
 
-  if (!SIV_Decrypt(key->siv, header->nonce, sizeof (header->nonce),
+  if (!SIV_Decrypt(key->siv, nonce, key->nonce_length,
                    "", 0,
                    ciphertext, ciphertext_length,
                    plaintext, plaintext_length)) {
@@ -954,7 +1011,19 @@ NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context)
     return 0;
   }
 
-  context->algorithm = AEAD_AES_SIV_CMAC_256;
+  /* Select a supported algorithm corresponding to the key length, avoiding
+     potentially slow SIV_GetKeyLength() */
+  switch (plaintext_length / 2) {
+    case 16:
+      context->algorithm = AEAD_AES_128_GCM_SIV;
+      break;
+    case 32:
+      context->algorithm = AEAD_AES_SIV_CMAC_256;
+      break;
+    default:
+      DEBUG_LOG("Unknown key length");
+      return 0;
+  }
 
   context->c2s.length = plaintext_length / 2;
   context->s2c.length = plaintext_length / 2;

nts_ke_session.c

@@ -667,6 +667,8 @@ create_credentials(const char **certs, const char **keys, int n_certs_keys,
       assert(0);
 
     for (i = 0; i < n_certs_keys; i++) {
+      if (!UTI_CheckFilePermissions(keys[i], 0771))
+        ;
       r = gnutls_certificate_set_x509_key_file(credentials, certs[i], keys[i],
                                                GNUTLS_X509_FMT_PEM);
       if (r < 0)

nts_ntp_auth.c

@@ -61,23 +61,25 @@ get_padded_length(int length)
 
 int
 NNA_GenerateAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv,
-                   const unsigned char *nonce, int nonce_length,
+                   const unsigned char *nonce, int max_nonce_length,
                    const unsigned char *plaintext, int plaintext_length,
                    int min_ef_length)
 {
-  int auth_length, ciphertext_length, assoc_length;
+  int auth_length, ciphertext_length, assoc_length, nonce_length, max_siv_nonce_length;
   int nonce_padding, ciphertext_padding, additional_padding;
   unsigned char *ciphertext, *body;
   struct AuthHeader *header;
 
   assert(sizeof (*header) == 4);
 
-  if (nonce_length <= 0 || plaintext_length < 0) {
+  if (max_nonce_length <= 0 || plaintext_length < 0) {
     DEBUG_LOG("Invalid nonce/plaintext length");
     return 0;
   }
 
   assoc_length = info->length;
+  max_siv_nonce_length = SIV_GetMaxNonceLength(siv);
+  nonce_length = MIN(max_nonce_length, max_siv_nonce_length);
   ciphertext_length = SIV_GetTagLength(siv) + plaintext_length;
   nonce_padding = get_padding_length(nonce_length);
   ciphertext_padding = get_padding_length(ciphertext_length);
@@ -86,8 +88,8 @@ NNA_GenerateAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv,
   auth_length = sizeof (*header) + nonce_length + nonce_padding +
                 ciphertext_length + ciphertext_padding;
   additional_padding = MAX(min_ef_length - auth_length - 4, 0);
-  additional_padding = MAX(NTS_MIN_UNPADDED_NONCE_LENGTH - nonce_length - nonce_padding,
-                           additional_padding);
+  additional_padding = MAX(MIN(NTS_MIN_UNPADDED_NONCE_LENGTH, max_siv_nonce_length) -
+                           nonce_length - nonce_padding, additional_padding);
   auth_length += additional_padding;
 
   if (!NEF_AddBlankField(packet, info, NTP_EF_NTS_AUTH_AND_EEF, auth_length,
@@ -113,6 +115,7 @@ NNA_GenerateAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv,
                    plaintext, plaintext_length, ciphertext, ciphertext_length)) {
     DEBUG_LOG("SIV encrypt failed");
     info->length = assoc_length;
+    info->ext_fields--;
     return 0;
   }
 
@@ -127,7 +130,7 @@ int
 NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, int ef_start,
                   unsigned char *plaintext, int buffer_length, int *plaintext_length)
 {
-  unsigned int siv_tag_length, nonce_length, ciphertext_length;
+  int siv_tag_length, max_siv_nonce_length, nonce_length, ciphertext_length;
   unsigned char *nonce, *ciphertext;
   int ef_type, ef_body_length;
   void *ef_body;
@@ -155,6 +158,7 @@ NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, in
   nonce = (unsigned char *)(header + 1);
   ciphertext = nonce + get_padded_length(nonce_length);
 
+  max_siv_nonce_length = SIV_GetMaxNonceLength(siv);
   siv_tag_length = SIV_GetTagLength(siv);
 
   if (nonce_length < 1 ||
@@ -164,8 +168,8 @@ NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, in
     return 0;
   }
 
-  if (ef_body_length < sizeof (*header) +
-        NTS_MIN_UNPADDED_NONCE_LENGTH + get_padded_length(ciphertext_length)) {
+  if (sizeof (*header) + MIN(NTS_MIN_UNPADDED_NONCE_LENGTH, max_siv_nonce_length) +
+      get_padded_length(ciphertext_length) > ef_body_length) {
     DEBUG_LOG("Missing padding");
     return 0;
   }

nts_ntp_auth.h

@@ -32,7 +32,7 @@
 #include "siv.h"
 
 extern int NNA_GenerateAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv,
-                              const unsigned char *nonce, int nonce_length,
+                              const unsigned char *nonce, int max_nonce_length,
                               const unsigned char *plaintext, int plaintext_length,
                               int min_ef_length);
 

nts_ntp_client.c

@@ -46,6 +46,9 @@
 /* Maximum length of all cookies to avoid IP fragmentation */
 #define MAX_TOTAL_COOKIE_LENGTH (8 * 108)
 
+/* Retry interval for NTS-KE start (which doesn't generate network traffic) */
+#define RETRY_INTERVAL_KE_START 2.0
+
 /* Magic string of files containing keys and cookies */
 #define DUMP_IDENTIFIER "NNC0\n"
 
@@ -203,10 +206,15 @@ set_ntp_address(NNC_Instance inst, NTP_Remote_Address *negotiated_address)
 /* ================================================== */
 
 static void
-update_next_nke_attempt(NNC_Instance inst, double now)
+update_next_nke_attempt(NNC_Instance inst, int failed_start, double now)
 {
   int factor, interval;
 
+  if (failed_start) {
+    inst->next_nke_attempt = now + RETRY_INTERVAL_KE_START;
+    return;
+  }
+
   if (!inst->nke)
     return;
 
@@ -221,8 +229,8 @@ static int
 get_cookies(NNC_Instance inst)
 {
   NTP_Remote_Address ntp_address;
+  int got_data, failed_start = 0;
   double now;
-  int got_data;
 
   assert(inst->num_cookies == 0);
 
@@ -239,13 +247,12 @@ get_cookies(NNC_Instance inst)
     inst->nke = NKC_CreateInstance(&inst->nts_address, inst->name, inst->cert_set);
 
     inst->nke_attempts++;
-    update_next_nke_attempt(inst, now);
 
     if (!NKC_Start(inst->nke))
-      return 0;
+      failed_start = 1;
   }
 
-  update_next_nke_attempt(inst, now);
+  update_next_nke_attempt(inst, failed_start, now);
 
   /* Wait until the session stops */
   if (NKC_IsActive(inst->nke))
@@ -643,6 +650,7 @@ load_cookies(NNC_Instance inst)
                                             sizeof (inst->context.c2s.key));
 
   if (inst->context.s2c.length != SIV_GetKeyLength(algorithm) ||
+      inst->context.s2c.length <= 0 ||
       inst->context.c2s.length != inst->context.s2c.length)
     goto error;
 

nts_ntp_server.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020
+ * Copyright (C) Miroslav Lichvar  2020, 2022
  * 
  * 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
@@ -41,13 +41,15 @@
 #include "siv.h"
 #include "util.h"
 
-#define SERVER_SIV AEAD_AES_SIV_CMAC_256
+#define MAX_SERVER_SIVS 2
 
 struct NtsServer {
-  SIV_Instance siv;
+  SIV_Instance sivs[MAX_SERVER_SIVS];
+  SIV_Algorithm siv_algorithms[MAX_SERVER_SIVS];
   unsigned char nonce[NTS_MIN_UNPADDED_NONCE_LENGTH];
   NKE_Cookie cookies[NTS_MAX_COOKIES];
   int num_cookies;
+  int siv_index;
   NTP_int64 req_tx;
 };
 
@@ -60,6 +62,7 @@ void
 NNS_Initialise(void)
 {
   const char **certs, **keys;
+  int i;
 
   /* Create an NTS-NTP server instance only if NTS-KE server is enabled */
   if (CNF_GetNtsServerCertAndKeyFiles(&certs, &keys) <= 0) {
@@ -68,9 +71,17 @@ NNS_Initialise(void)
   }
 
   server = Malloc(sizeof (struct NtsServer));
-  server->siv = SIV_CreateInstance(SERVER_SIV);
-  if (!server->siv)
-    LOG_FATAL("Could not initialise SIV cipher");
+
+  server->siv_algorithms[0] = AEAD_AES_SIV_CMAC_256;
+  server->siv_algorithms[1] = AEAD_AES_128_GCM_SIV;
+  assert(MAX_SERVER_SIVS == 2);
+
+  for (i = 0; i < 2; i++)
+    server->sivs[i] = SIV_CreateInstance(server->siv_algorithms[i]);
+
+  /* AES-SIV-CMAC-256 is required on servers */
+  if (!server->sivs[0])
+    LOG_FATAL("Missing AES-SIV-CMAC-256");
 }
 
 /* ================================================== */
@@ -78,10 +89,15 @@ NNS_Initialise(void)
 void
 NNS_Finalise(void)
 {
+  int i;
+
   if (!server)
     return;
 
-  SIV_DestroyInstance(server->siv);
+  for (i = 0; i < MAX_SERVER_SIVS; i++) {
+    if (server->sivs[i])
+      SIV_DestroyInstance(server->sivs[i]);
+  }
   Free(server);
   server = NULL;
 }
@@ -96,6 +112,7 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
   unsigned char plaintext[NTP_MAX_EXTENSIONS_LENGTH];
   NKE_Context context;
   NKE_Cookie cookie;
+  SIV_Instance siv;
   void *ef_body;
 
   *kod = 0;
@@ -104,6 +121,7 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
     return 0;
 
   server->num_cookies = 0;
+  server->siv_index = -1;
   server->req_tx = packet->transmit_ts;
 
   if (info->ext_fields == 0 || info->mode != MODE_CLIENT)
@@ -163,17 +181,22 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
     return 0;
   }
 
-  if (context.algorithm != SERVER_SIV) {
+  /* Find the SIV instance needed for authentication */
+  for (i = 0; i < MAX_SERVER_SIVS && context.algorithm != server->siv_algorithms[i]; i++)
+    ;
+  if (i == MAX_SERVER_SIVS || !server->sivs[i]) {
     DEBUG_LOG("Unexpected SIV");
     return 0;
   }
+  server->siv_index = i;
+  siv = server->sivs[i];
 
-  if (!SIV_SetKey(server->siv, context.c2s.key, context.c2s.length)) {
+  if (!SIV_SetKey(siv, context.c2s.key, context.c2s.length)) {
     DEBUG_LOG("Could not set C2S key");
     return 0;
   }
 
-  if (!NNA_DecryptAuthEF(packet, info, server->siv, auth_start,
+  if (!NNA_DecryptAuthEF(packet, info, siv, auth_start,
                          plaintext, sizeof (plaintext), &plaintext_length)) {
     *kod = NTP_KOD_NTS_NAK;
     return 0;
@@ -199,7 +222,7 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
     }
   }
 
-  if (!SIV_SetKey(server->siv, context.s2c.key, context.s2c.length)) {
+  if (!SIV_SetKey(siv, context.s2c.key, context.s2c.length)) {
     DEBUG_LOG("Could not set S2C key");
     return 0;
   }
@@ -271,9 +294,12 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
 
   server->num_cookies = 0;
 
+  if (server->siv_index < 0)
+    return 0;
+
   /* Generate an authenticator field which will make the length
      of the response equal to the length of the request */
-  if (!NNA_GenerateAuthEF(response, res_info, server->siv,
+  if (!NNA_GenerateAuthEF(response, res_info, server->sivs[server->siv_index],
                           server->nonce, sizeof (server->nonce),
                           plaintext, plaintext_length,
                           req_info->length - res_info->length))

pktlength.c

@@ -129,6 +129,7 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(select_data, select_data),   /* SELECT_DATA */
   REQ_LENGTH_ENTRY(null, null),                 /* RELOAD_SOURCES */
   REQ_LENGTH_ENTRY(doffset, null),              /* DOFFSET2 */
+  REQ_LENGTH_ENTRY(modify_select_opts, null),   /* MODIFY_SELECTOPTS */
 };
 
 static const uint16_t reply_lengths[] = {
@@ -156,7 +157,8 @@ static const uint16_t reply_lengths[] = {
   RPY_LENGTH_ENTRY(client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX3 */
   0,                                            /* SERVER_STATS2 - not supported */
   RPY_LENGTH_ENTRY(select_data),                /* SELECT_DATA */
-  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS3 */
+  0,                                            /* SERVER_STATS3 - not supported */
+  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS4 */
 };
 
 /* ================================================== */

ptp.h

@@ -44,7 +44,12 @@ typedef struct {
   uint8_t domain;
   uint8_t min_sdoid;
   uint16_t flags;
-  uint8_t rest[26];
+  uint8_t correction[8];
+  uint8_t msg_specific[4];
+  uint8_t port_id[10];
+  uint16_t sequence_id;
+  uint8_t control;
+  int8_t interval;
 } PTP_Header;
 
 typedef struct {

refclock_phc.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2013, 2017
+ * Copyright (C) Miroslav Lichvar  2013, 2017, 2023
  * 
  * 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
@@ -33,6 +33,9 @@
 
 #include "sysincl.h"
 
+#include <sys/sysmacros.h>
+
+#include "array.h"
 #include "refclock.h"
 #include "hwclock.h"
 #include "local.h"
@@ -44,14 +47,19 @@
 
 struct phc_instance {
   int fd;
+  int dev_index;
   int mode;
   int nocrossts;
   int extpps;
   int pin;
   int channel;
+  struct timespec last_extts;
   HCL_Instance clock;
 };
 
+/* Array of RCL_Instance with enabled extpps */
+static ARR_Instance extts_phcs = NULL;
+
 static void read_ext_pulse(int sockfd, int event, void *anything);
 
 static int phc_initialise(RCL_Instance instance)
@@ -59,6 +67,7 @@ static int phc_initialise(RCL_Instance instance)
   const char *options[] = {"nocrossts", "extpps", "pin", "channel", "clear", NULL};
   struct phc_instance *phc;
   int phc_fd, rising_edge;
+  struct stat st;
   char *path, *s;
 
   RCL_CheckDriverOptions(instance, options);
@@ -71,10 +80,13 @@ static int phc_initialise(RCL_Instance instance)
 
   phc = MallocNew(struct phc_instance);
   phc->fd = phc_fd;
+  if (fstat(phc_fd, &st) < 0 || !S_ISCHR(st.st_mode))
+    LOG_FATAL("Could not get PHC index");
+  phc->dev_index = minor(st.st_rdev);
   phc->mode = 0;
   phc->nocrossts = RCL_GetDriverOption(instance, "nocrossts") ? 1 : 0;
   phc->extpps = RCL_GetDriverOption(instance, "extpps") ? 1 : 0;
-
+  UTI_ZeroTimespec(&phc->last_extts);
   phc->clock = HCL_CreateInstance(0, 16, UTI_Log2ToDouble(RCL_GetDriverPoll(instance)),
                                   RCL_GetPrecision(instance));
 
@@ -90,6 +102,10 @@ static int phc_initialise(RCL_Instance instance)
       LOG_FATAL("Could not enable external PHC timestamping");
 
     SCH_AddFileHandler(phc->fd, SCH_FILE_INPUT, read_ext_pulse, instance);
+
+    if (!extts_phcs)
+      extts_phcs = ARR_CreateInstance(sizeof (RCL_Instance));
+    ARR_AppendElement(extts_phcs, &instance);
   } else {
     phc->pin = phc->channel = 0;
   }
@@ -101,12 +117,22 @@ static int phc_initialise(RCL_Instance instance)
 static void phc_finalise(RCL_Instance instance)
 {
   struct phc_instance *phc;
+  unsigned int i;
 
   phc = (struct phc_instance *)RCL_GetDriverData(instance);
 
   if (phc->extpps) {
     SCH_RemoveFileHandler(phc->fd);
     SYS_Linux_SetPHCExtTimestamping(phc->fd, phc->pin, phc->channel, 0, 0, 0);
+
+    for (i = 0; i < ARR_GetSize(extts_phcs); i++) {
+      if ((*(RCL_Instance *)ARR_GetElement(extts_phcs, i)) == instance)
+        ARR_RemoveElement(extts_phcs, i--);
+    }
+    if (ARR_GetSize(extts_phcs) == 0) {
+      ARR_DestroyInstance(extts_phcs);
+      extts_phcs = NULL;
+    }
   }
 
   HCL_DestroyInstance(phc->clock);
@@ -114,30 +140,52 @@ static void phc_finalise(RCL_Instance instance)
   Free(phc);
 }
 
-static void read_ext_pulse(int fd, int event, void *anything)
+static void process_ext_pulse(RCL_Instance instance, struct timespec *phc_ts)
 {
-  RCL_Instance instance;
   struct phc_instance *phc;
-  struct timespec phc_ts, local_ts;
+  struct timespec local_ts;
   double local_err;
-  int channel;
 
-  instance = anything;
   phc = RCL_GetDriverData(instance);
 
-  if (!SYS_Linux_ReadPHCExtTimestamp(phc->fd, &phc_ts, &channel))
-    return;
-
-  if (channel != phc->channel) {
-    DEBUG_LOG("Unexpected extts channel %d\n", channel);
+  if (UTI_CompareTimespecs(&phc->last_extts, phc_ts) == 0) {
+    DEBUG_LOG("Ignoring duplicated PHC timestamp");
     return;
   }
+  phc->last_extts = *phc_ts;
 
-  if (!HCL_CookTime(phc->clock, &phc_ts, &local_ts, &local_err))
+  if (!HCL_CookTime(phc->clock, phc_ts, &local_ts, &local_err))
     return;
 
   RCL_AddCookedPulse(instance, &local_ts, 1.0e-9 * local_ts.tv_nsec, local_err,
-                     UTI_DiffTimespecsToDouble(&phc_ts, &local_ts));
+                     UTI_DiffTimespecsToDouble(phc_ts, &local_ts));
+}
+
+static void read_ext_pulse(int fd, int event, void *anything)
+{
+  RCL_Instance instance;
+  struct phc_instance *phc1, *phc2;
+  struct timespec phc_ts;
+  unsigned int i;
+  int channel;
+
+  if (!SYS_Linux_ReadPHCExtTimestamp(fd, &phc_ts, &channel))
+    return;
+
+  instance = anything;
+  phc1 = RCL_GetDriverData(instance);
+
+  /* The Linux kernel (as of 6.2) has one shared queue of timestamps for all
+     descriptors of the same PHC.  Search for all refclocks that expect
+     the timestamp. */
+
+  for (i = 0; i < ARR_GetSize(extts_phcs); i++) {
+    instance = *(RCL_Instance *)ARR_GetElement(extts_phcs, i);
+    phc2 = RCL_GetDriverData(instance);
+    if (!phc2->extpps || phc2->dev_index != phc1->dev_index || phc2->channel != channel)
+      continue;
+    process_ext_pulse(instance, &phc_ts);
+  }
 }
 
 #define PHC_READINGS 25

refclock_sock.c

@@ -58,8 +58,29 @@ struct sock_sample {
   int magic;
 };
 
+/* On 32-bit glibc-based systems enable conversion between timevals using
+   32-bit and 64-bit time_t to support SOCK clients compiled with different
+   time_t size than chrony */
+#ifdef __GLIBC_PREREQ
+#if __GLIBC_PREREQ(2, 34) && __TIMESIZE == 32
+#define CONVERT_TIMEVAL 1
+#if defined(_TIME_BITS) && _TIME_BITS == 64
+typedef int32_t alt_time_t;
+typedef int32_t alt_suseconds_t;
+#else
+typedef int64_t alt_time_t;
+typedef int64_t alt_suseconds_t;
+#endif
+struct alt_timeval {
+  alt_time_t tv_sec;
+  alt_suseconds_t tv_usec;
+};
+#endif
+#endif
+
 static void read_sample(int sockfd, int event, void *anything)
 {
+  char buf[sizeof (struct sock_sample) + 16];
   struct timespec sys_ts, ref_ts;
   struct sock_sample sample;
   RCL_Instance instance;
@@ -67,14 +88,33 @@ static void read_sample(int sockfd, int event, void *anything)
 
   instance = (RCL_Instance)anything;
 
-  s = recv(sockfd, &sample, sizeof (sample), 0);
+  s = recv(sockfd, buf, sizeof (buf), 0);
 
   if (s < 0) {
     DEBUG_LOG("Could not read SOCK sample : %s", strerror(errno));
     return;
   }
 
-  if (s != sizeof (sample)) {
+  if (s == sizeof (sample)) {
+    memcpy(&sample, buf, sizeof (sample));
+#ifdef CONVERT_TIMEVAL
+  } else if (s == sizeof (sample) - sizeof (struct timeval) + sizeof (struct alt_timeval)) {
+    struct alt_timeval atv;
+    memcpy(&atv, buf, sizeof (atv));
+#ifndef HAVE_LONG_TIME_T
+    if (atv.tv_sec > INT32_MAX || atv.tv_sec < INT32_MIN ||
+        atv.tv_usec > INT32_MAX || atv.tv_usec < INT32_MIN) {
+      DEBUG_LOG("Could not convert 64-bit timeval");
+      return;
+    }
+#endif
+    sample.tv.tv_sec = atv.tv_sec;
+    sample.tv.tv_usec = atv.tv_usec;
+    DEBUG_LOG("Converted %d-bit timeval", 8 * (int)sizeof (alt_time_t));
+    memcpy((char *)&sample + sizeof (struct timeval), buf + sizeof (struct alt_timeval),
+           sizeof (sample) - sizeof (struct timeval));
+#endif
+  } else {
     DEBUG_LOG("Unexpected length of SOCK sample : %d != %ld",
               s, (long)sizeof (sample));
     return;

reference.c

@@ -1329,6 +1329,7 @@ void
 REF_ModifyMaxupdateskew(double new_max_update_skew)
 {
   max_update_skew = new_max_update_skew * 1.0e-6;
+  LOG(LOGS_INFO, "New maxupdateskew %f ppm", new_max_update_skew);
 }
 
 /* ================================================== */
@@ -1338,6 +1339,7 @@ REF_ModifyMakestep(int limit, double threshold)
 {
   make_step_limit = limit;
   make_step_threshold = threshold;
+  LOG(LOGS_INFO, "New makestep %f %d", threshold, limit);
 }
 
 /* ================================================== */
@@ -1349,6 +1351,7 @@ REF_EnableLocal(int stratum, double distance, int orphan)
   local_stratum = CLAMP(1, stratum, NTP_MAX_STRATUM - 1);
   local_distance = distance;
   local_orphan = !!orphan;
+  LOG(LOGS_INFO, "%s local reference mode", "Enabled");
 }
 
 /* ================================================== */
@@ -1357,6 +1360,7 @@ void
 REF_DisableLocal(void)
 {
   enable_local_stratum = 0;
+  LOG(LOGS_INFO, "%s local reference mode", "Disabled");
 }
 
 /* ================================================== */

reports.h

@@ -109,17 +109,23 @@ typedef struct {
 } RPT_ClientAccessByIndex_Report;
 
 typedef struct {
-  uint32_t ntp_hits;
-  uint32_t nke_hits;
-  uint32_t cmd_hits;
-  uint32_t ntp_drops;
-  uint32_t nke_drops;
-  uint32_t cmd_drops;
-  uint32_t log_drops;
-  uint32_t ntp_auth_hits;
-  uint32_t ntp_interleaved_hits;
-  uint32_t ntp_timestamps;
-  uint32_t ntp_span_seconds;
+  uint64_t ntp_hits;
+  uint64_t nke_hits;
+  uint64_t cmd_hits;
+  uint64_t ntp_drops;
+  uint64_t nke_drops;
+  uint64_t cmd_drops;
+  uint64_t log_drops;
+  uint64_t ntp_auth_hits;
+  uint64_t ntp_interleaved_hits;
+  uint64_t ntp_timestamps;
+  uint64_t ntp_span_seconds;
+  uint64_t ntp_daemon_rx_timestamps;
+  uint64_t ntp_daemon_tx_timestamps;
+  uint64_t ntp_kernel_rx_timestamps;
+  uint64_t ntp_kernel_tx_timestamps;
+  uint64_t ntp_hw_rx_timestamps;
+  uint64_t ntp_hw_tx_timestamps;
 } RPT_ServerStatsReport;
 
 typedef struct {

sched.c

@@ -104,7 +104,10 @@ static unsigned long n_timer_queue_entries;
 static SCH_TimeoutID next_tqe_id;
 
 /* Pointer to head of free list */
-static TimerQueueEntry *tqe_free_list = NULL;
+static TimerQueueEntry *tqe_free_list;
+
+/* Array of all allocated tqe blocks to be freed in finalisation */
+static ARR_Instance tqe_blocks;
 
 /* Timestamp when was last timeout dispatched for each class */
 static struct timespec last_class_dispatch[SCH_NumberOfClasses];
@@ -133,6 +136,8 @@ SCH_Initialise(void)
 
   n_timer_queue_entries = 0;
   next_tqe_id = 0;
+  tqe_free_list = NULL;
+  tqe_blocks = ARR_CreateInstance(sizeof (TimerQueueEntry *));
 
   timer_queue.next = &timer_queue;
   timer_queue.prev = &timer_queue;
@@ -154,8 +159,16 @@ SCH_Initialise(void)
 
 void
 SCH_Finalise(void) {
+  unsigned int i;
+
   ARR_DestroyInstance(file_handlers);
 
+  timer_queue.next = &timer_queue;
+  timer_queue.prev = &timer_queue;
+  for (i = 0; i < ARR_GetSize(tqe_blocks); i++)
+    Free(*(TimerQueueEntry **)ARR_GetElement(tqe_blocks, i));
+  ARR_DestroyInstance(tqe_blocks);
+
   LCL_RemoveParameterChangeHandler(handle_slew, NULL);
 
   initialised = 0;
@@ -281,6 +294,7 @@ allocate_tqe(void)
     }
     new_block[0].next = NULL;
     tqe_free_list = &(new_block[TQE_ALLOC_QUANTUM - 1]);
+    ARR_AppendElement(tqe_blocks, &new_block);
   }
 
   result = tqe_free_list;

sched.h

@@ -37,6 +37,7 @@ typedef enum {
   SCH_NtpClientClass,
   SCH_NtpPeerClass,
   SCH_NtpBroadcastClass,
+  SCH_PhcPollClass,
   SCH_NumberOfClasses /* needs to be last */
 } SCH_TimeoutClass;
 

siv.h

@@ -53,6 +53,10 @@ extern int SIV_GetKeyLength(SIV_Algorithm algorithm);
 
 extern int SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length);
 
+extern int SIV_GetMinNonceLength(SIV_Instance instance);
+
+extern int SIV_GetMaxNonceLength(SIV_Instance instance);
+
 extern int SIV_GetTagLength(SIV_Instance instance);
 
 extern int SIV_Encrypt(SIV_Instance instance,

siv_gnutls.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020
+ * Copyright (C) Miroslav Lichvar  2020, 2023
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -37,6 +37,8 @@
 struct SIV_Instance_Record {
   gnutls_cipher_algorithm_t algorithm;
   gnutls_aead_cipher_hd_t cipher;
+  int min_nonce_length;
+  int max_nonce_length;
 };
 
 /* ================================================== */
@@ -81,6 +83,10 @@ get_cipher_algorithm(SIV_Algorithm algorithm)
   switch (algorithm) {
     case AEAD_AES_SIV_CMAC_256:
       return GNUTLS_CIPHER_AES_128_SIV;
+#if HAVE_GNUTLS_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      return GNUTLS_CIPHER_AES_128_SIV_GCM;
+#endif
     default:
       return 0;
   }
@@ -112,6 +118,19 @@ SIV_CreateInstance(SIV_Algorithm algorithm)
   instance->algorithm = calgo;
   instance->cipher = NULL;
 
+  switch (algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      instance->min_nonce_length = 1;
+      instance->max_nonce_length = INT_MAX;
+      break;
+    case AEAD_AES_128_GCM_SIV:
+      instance->min_nonce_length = 12;
+      instance->max_nonce_length = 12;
+      break;
+    default:
+      assert(0);
+  }
+
   instance_counter++;
 
   return instance;
@@ -143,6 +162,8 @@ SIV_GetKeyLength(SIV_Algorithm algorithm)
     return 0;
 
   len = gnutls_cipher_get_key_size(calgo);
+  if (len == 0)
+    return 0;
 
   if (len < 1 || len > SIV_MAX_KEY_LENGTH)
     LOG_FATAL("Invalid key length");
@@ -195,6 +216,22 @@ SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
 
 /* ================================================== */
 
+int
+SIV_GetMinNonceLength(SIV_Instance instance)
+{
+  return instance->min_nonce_length;
+}
+
+/* ================================================== */
+
+int
+SIV_GetMaxNonceLength(SIV_Instance instance)
+{
+  return instance->max_nonce_length;
+}
+
+/* ================================================== */
+
 int
 SIV_GetTagLength(SIV_Instance instance)
 {
@@ -222,7 +259,8 @@ SIV_Encrypt(SIV_Instance instance,
   if (!instance->cipher)
     return 0;
 
-  if (nonce_length < 1 || assoc_length < 0 ||
+  if (nonce_length < instance->min_nonce_length ||
+      nonce_length > instance->max_nonce_length || assoc_length < 0 ||
       plaintext_length < 0 || ciphertext_length < 0)
     return 0;
 
@@ -253,7 +291,8 @@ SIV_Decrypt(SIV_Instance instance,
   if (!instance->cipher)
     return 0;
 
-  if (nonce_length < 1 || assoc_length < 0 ||
+  if (nonce_length < instance->min_nonce_length ||
+      nonce_length > instance->max_nonce_length || assoc_length < 0 ||
       plaintext_length < 0 || ciphertext_length < 0)
     return 0;
 

siv_nettle.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2019
+ * Copyright (C) Miroslav Lichvar  2019, 2022
  * 
  * 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
@@ -34,12 +34,25 @@
 #include "siv_nettle_int.c"
 #endif
 
+#ifdef HAVE_NETTLE_SIV_GCM
+#include <nettle/siv-gcm.h>
+#endif
+
 #include "memory.h"
 #include "siv.h"
 
 struct SIV_Instance_Record {
-  struct siv_cmac_aes128_ctx siv;
+  SIV_Algorithm algorithm;
   int key_set;
+  int min_nonce_length;
+  int max_nonce_length;
+  int tag_length;
+  union {
+    struct siv_cmac_aes128_ctx cmac_aes128;
+#ifdef HAVE_NETTLE_SIV_GCM
+    struct aes128_ctx aes128;
+#endif
+  } ctx;
 };
 
 /* ================================================== */
@@ -49,12 +62,30 @@ SIV_CreateInstance(SIV_Algorithm algorithm)
 {
   SIV_Instance instance;
 
-  if (algorithm != AEAD_AES_SIV_CMAC_256)
+  if (SIV_GetKeyLength(algorithm) <= 0)
     return NULL;
 
   instance = MallocNew(struct SIV_Instance_Record);
+  instance->algorithm = algorithm;
   instance->key_set = 0;
 
+  switch (algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      instance->min_nonce_length = SIV_MIN_NONCE_SIZE;
+      instance->max_nonce_length = INT_MAX;
+      instance->tag_length = SIV_DIGEST_SIZE;
+      break;
+#ifdef HAVE_NETTLE_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      instance->min_nonce_length = SIV_GCM_NONCE_SIZE;
+      instance->max_nonce_length = SIV_GCM_NONCE_SIZE;
+      instance->tag_length = SIV_GCM_DIGEST_SIZE;
+      break;
+#endif
+    default:
+      assert(0);
+  }
+
   return instance;
 }
 
@@ -71,11 +102,18 @@ SIV_DestroyInstance(SIV_Instance instance)
 int
 SIV_GetKeyLength(SIV_Algorithm algorithm)
 {
-  assert(32 <= SIV_MAX_KEY_LENGTH);
+  assert(2 * AES128_KEY_SIZE <= SIV_MAX_KEY_LENGTH);
 
-  if (algorithm == AEAD_AES_SIV_CMAC_256)
-    return 32;
-  return 0;
+  switch (algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      return 2 * AES128_KEY_SIZE;
+#ifdef HAVE_NETTLE_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      return AES128_KEY_SIZE;
+#endif
+    default:
+      return 0;
+  }
 }
 
 /* ================================================== */
@@ -83,10 +121,21 @@ SIV_GetKeyLength(SIV_Algorithm algorithm)
 int
 SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
 {
-  if (length != 32)
+  if (length != SIV_GetKeyLength(instance->algorithm))
     return 0;
 
-  siv_cmac_aes128_set_key(&instance->siv, key);
+  switch (instance->algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      siv_cmac_aes128_set_key(&instance->ctx.cmac_aes128, key);
+      break;
+#ifdef HAVE_NETTLE_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      aes128_set_encrypt_key(&instance->ctx.aes128, key);
+      break;
+#endif
+    default:
+      assert(0);
+  }
 
   instance->key_set = 1;
 
@@ -95,12 +144,28 @@ SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
 
 /* ================================================== */
 
+int
+SIV_GetMinNonceLength(SIV_Instance instance)
+{
+  return instance->min_nonce_length;
+}
+
+/* ================================================== */
+
+int
+SIV_GetMaxNonceLength(SIV_Instance instance)
+{
+  return instance->max_nonce_length;
+}
+
+/* ================================================== */
+
 int
 SIV_GetTagLength(SIV_Instance instance)
 {
-  assert(SIV_DIGEST_SIZE <= SIV_MAX_TAG_LENGTH);
-
-  return SIV_DIGEST_SIZE;
+  if (instance->tag_length < 1 || instance->tag_length > SIV_MAX_TAG_LENGTH)
+    assert(0);
+  return instance->tag_length;
 }
 
 /* ================================================== */
@@ -115,16 +180,31 @@ SIV_Encrypt(SIV_Instance instance,
   if (!instance->key_set)
     return 0;
 
-  if (nonce_length < SIV_MIN_NONCE_SIZE || assoc_length < 0 ||
+  if (nonce_length < instance->min_nonce_length ||
+      nonce_length > instance->max_nonce_length || assoc_length < 0 ||
       plaintext_length < 0 || plaintext_length > ciphertext_length ||
-      plaintext_length + SIV_DIGEST_SIZE != ciphertext_length)
+      plaintext_length + SIV_GetTagLength(instance) != ciphertext_length)
     return 0;
 
   assert(assoc && plaintext);
 
-  siv_cmac_aes128_encrypt_message(&instance->siv, nonce_length, nonce,
-                                  assoc_length, assoc,
-                                  ciphertext_length, ciphertext, plaintext);
+  switch (instance->algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      siv_cmac_aes128_encrypt_message(&instance->ctx.cmac_aes128,
+                                      nonce_length, nonce, assoc_length, assoc,
+                                      ciphertext_length, ciphertext, plaintext);
+      break;
+#ifdef HAVE_NETTLE_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      siv_gcm_aes128_encrypt_message(&instance->ctx.aes128,
+                                     nonce_length, nonce, assoc_length, assoc,
+                                     ciphertext_length, ciphertext, plaintext);
+      break;
+#endif
+    default:
+      assert(0);
+  }
+
   return 1;
 }
 
@@ -140,17 +220,32 @@ SIV_Decrypt(SIV_Instance instance,
   if (!instance->key_set)
     return 0;
 
-  if (nonce_length < SIV_MIN_NONCE_SIZE || assoc_length < 0 ||
+  if (nonce_length < instance->min_nonce_length ||
+      nonce_length > instance->max_nonce_length || assoc_length < 0 ||
       plaintext_length < 0 || plaintext_length > ciphertext_length ||
-      plaintext_length + SIV_DIGEST_SIZE != ciphertext_length)
+      plaintext_length + SIV_GetTagLength(instance) != ciphertext_length)
     return 0;
 
   assert(assoc && plaintext);
 
-  if (!siv_cmac_aes128_decrypt_message(&instance->siv, nonce_length, nonce,
-                                       assoc_length, assoc,
-                                       plaintext_length, plaintext, ciphertext))
-    return 0;
+  switch (instance->algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      if (!siv_cmac_aes128_decrypt_message(&instance->ctx.cmac_aes128,
+                                           nonce_length, nonce, assoc_length, assoc,
+                                           plaintext_length, plaintext, ciphertext))
+        return 0;
+      break;
+#ifdef HAVE_NETTLE_SIV_GCM
+    case AEAD_AES_128_GCM_SIV:
+      if (!siv_gcm_aes128_decrypt_message(&instance->ctx.aes128,
+                                          nonce_length, nonce, assoc_length, assoc,
+                                          plaintext_length, plaintext, ciphertext))
+        return 0;
+      break;
+#endif
+    default:
+      assert(0);
+  }
 
   return 1;
 }

smooth.c

@@ -302,7 +302,7 @@ SMT_Activate(struct timespec *now)
   if (!enabled || !locked)
     return;
 
-  LOG(LOGS_INFO, "Time smoothing activated%s", leap_only_mode ?
+  LOG(LOGS_INFO, "Activated %s%s", "time smoothing", leap_only_mode ?
       " (leap seconds only)" : "");
   locked = 0;
   last_update = *now;
@@ -322,6 +322,8 @@ SMT_Reset(struct timespec *now)
 
   for (i = 0; i < NUM_STAGES; i++)
     stages[i].wander = stages[i].length = 0.0;
+
+  LOG(LOGS_INFO, "Reset %s", "time smoothing");
 }
 
 void

socket.c

@@ -5,6 +5,7 @@
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Timo Teras  2009
  * Copyright (C) Miroslav Lichvar  2009, 2013-2020
+ * Copyright (C) Luke Valenta  2023
  * 
  * 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
@@ -89,6 +90,9 @@ struct MessageHeader {
 
 static int initialised;
 
+static int first_reusable_fd;
+static int reusable_fds;
+
 /* Flags indicating in which IP families sockets can be requested */
 static int ip4_enabled;
 static int ip6_enabled;
@@ -155,6 +159,59 @@ domain_to_string(int domain)
 
 /* ================================================== */
 
+static int
+get_reusable_socket(int type, IPSockAddr *spec)
+{
+#ifdef LINUX
+  union sockaddr_all sa;
+  IPSockAddr ip_sa;
+  int sock_fd, opt;
+  socklen_t l;
+
+  /* Abort early if not an IPv4/IPv6 server socket */
+  if (!spec || spec->ip_addr.family == IPADDR_UNSPEC || spec->port == 0)
+    return INVALID_SOCK_FD;
+
+  /* Loop over available reusable sockets */
+  for (sock_fd = first_reusable_fd; sock_fd < first_reusable_fd + reusable_fds; sock_fd++) {
+
+    /* Check that types match */
+    l = sizeof (opt);
+    if (getsockopt(sock_fd, SOL_SOCKET, SO_TYPE, &opt, &l) < 0 ||
+        l != sizeof (opt) || opt != type)
+      continue;
+
+    /* Get sockaddr for reusable socket */
+    l = sizeof (sa);
+    if (getsockname(sock_fd, &sa.sa, &l) < 0 || l < sizeof (sa_family_t))
+      continue;
+    SCK_SockaddrToIPSockAddr(&sa.sa, l, &ip_sa);
+
+    /* Check that reusable socket matches specification */
+    if (ip_sa.port != spec->port || UTI_CompareIPs(&ip_sa.ip_addr, &spec->ip_addr, NULL) != 0)
+      continue;
+
+    /* Check that STREAM socket is listening */
+    l = sizeof (opt);
+    if (type == SOCK_STREAM && (getsockopt(sock_fd, SOL_SOCKET, SO_ACCEPTCONN, &opt, &l) < 0 ||
+                                l != sizeof (opt) || opt == 0))
+      continue;
+
+#if defined(FEAT_IPV6) && defined(IPV6_V6ONLY)
+    if (spec->ip_addr.family == IPADDR_INET6 &&
+        (!SCK_GetIntOption(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, &opt) || opt != 1))
+      LOG(LOGS_WARN, "Reusable IPv6 socket missing IPV6_V6ONLY option");
+#endif
+
+    return sock_fd;
+  }
+#endif
+
+  return INVALID_SOCK_FD;
+}
+
+/* ================================================== */
+
 #if defined(SOCK_CLOEXEC) || defined(SOCK_NONBLOCK)
 static int
 check_socket_flag(int sock_flag, int fd_flag, int fs_flag)
@@ -212,7 +269,7 @@ static int
 set_socket_flags(int sock_fd, int flags)
 {
   /* Close the socket automatically on exec */
-  if (
+  if (!SCK_IsReusable(sock_fd) &&
 #ifdef SOCK_CLOEXEC
       (supported_socket_flags & SOCK_CLOEXEC) == 0 &&
 #endif
@@ -222,7 +279,7 @@ set_socket_flags(int sock_fd, int flags)
   /* Enable non-blocking mode */
   if ((flags & SCK_FLAG_BLOCK) == 0 &&
 #ifdef SOCK_NONBLOCK
-      (supported_socket_flags & SOCK_NONBLOCK) == 0 &&
+      (SCK_IsReusable(sock_fd) || (supported_socket_flags & SOCK_NONBLOCK) == 0) &&
 #endif
       !set_socket_nonblock(sock_fd))
     return 0;
@@ -279,6 +336,32 @@ open_socket_pair(int domain, int type, int flags, int *other_fd)
 
 /* ================================================== */
 
+static int
+get_ip_socket(int domain, int type, int flags, IPSockAddr *ip_sa)
+{
+  int sock_fd;
+
+  /* Check if there is a matching reusable socket */
+  sock_fd = get_reusable_socket(type, ip_sa);
+
+  if (sock_fd < 0) {
+    sock_fd = open_socket(domain, type, flags);
+
+    /* Unexpected, but make sure the new socket is not in the reusable range */
+    if (SCK_IsReusable(sock_fd))
+      LOG_FATAL("Could not open %s socket : file descriptor in reusable range",
+                domain_to_string(domain));
+  } else {
+    /* Set socket flags on reusable socket */
+    if (!set_socket_flags(sock_fd, flags))
+      return INVALID_SOCK_FD;
+  }
+
+  return sock_fd;
+}
+
+/* ================================================== */
+
 static int
 set_socket_options(int sock_fd, int flags)
 {
@@ -295,8 +378,10 @@ static int
 set_ip_options(int sock_fd, int family, int flags)
 {
 #if defined(FEAT_IPV6) && defined(IPV6_V6ONLY)
-  /* Receive only IPv6 packets on an IPv6 socket */
-  if (family == IPADDR_INET6 && !SCK_SetIntOption(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1))
+  /* Receive only IPv6 packets on an IPv6 socket, but do not attempt
+     to set this option on pre-initialised reuseable sockets */
+  if (family == IPADDR_INET6 && !SCK_IsReusable(sock_fd) &&
+      !SCK_SetIntOption(sock_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1))
     return 0;
 #endif
 
@@ -385,6 +470,10 @@ bind_ip_address(int sock_fd, IPSockAddr *addr, int flags)
     ;
 #endif
 
+  /* Do not attempt to bind pre-initialised reusable socket */
+  if (SCK_IsReusable(sock_fd))
+    return 1;
+
   saddr_len = SCK_IPSockAddrToSockaddr(addr, (struct sockaddr *)&saddr, sizeof (saddr));
   if (saddr_len == 0)
     return 0;
@@ -457,7 +546,7 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *ifac
       return INVALID_SOCK_FD;
   }
 
-  sock_fd = open_socket(domain, type, flags);
+  sock_fd = get_ip_socket(domain, type, flags, local_addr);
   if (sock_fd < 0)
     return INVALID_SOCK_FD;
 
@@ -482,7 +571,8 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *ifac
     goto error;
 
   if (remote_addr || local_addr)
-    DEBUG_LOG("Opened %s%s socket fd=%d%s%s%s%s",
+    DEBUG_LOG("%s %s%s socket fd=%d%s%s%s%s",
+              SCK_IsReusable(sock_fd) ? "Reusing" : "Opened",
               type == SOCK_DGRAM ? "UDP" : type == SOCK_STREAM ? "TCP" : "?",
               family == IPADDR_INET4 ? "v4" : "v6",
               sock_fd,
@@ -869,6 +959,11 @@ process_header(struct msghdr *msg, int msg_length, int sock_fd, int flags,
       memcpy(&message->timestamp.kernel, CMSG_DATA(cmsg), sizeof (message->timestamp.kernel));
     }
 #endif
+#ifdef SCM_REALTIME
+    else if (match_cmsg(cmsg, SOL_SOCKET, SCM_REALTIME, sizeof (message->timestamp.kernel))) {
+      memcpy(&message->timestamp.kernel, CMSG_DATA(cmsg), sizeof (message->timestamp.kernel));
+    }
+#endif
 #ifdef HAVE_LINUX_TIMESTAMPING
 #ifdef HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO
     else if (match_cmsg(cmsg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
@@ -1165,9 +1260,44 @@ send_message(int sock_fd, SCK_Message *message, int flags)
 
 /* ================================================== */
 
+void
+SCK_PreInitialise(void)
+{
+#ifdef LINUX
+  char *s, *ptr;
+
+  /* On Linux systems, the systemd service manager may pass file descriptors
+     for pre-initialised sockets to the chronyd daemon.  The service manager
+     allocates and binds the file descriptors, and passes a copy to each
+     spawned instance of the service.  This allows for zero-downtime service
+     restarts as the sockets buffer client requests until the service is able
+     to handle them.  The service manager sets the LISTEN_FDS environment
+     variable to the number of passed file descriptors, and the integer file
+     descriptors start at 3 (see SD_LISTEN_FDS_START in
+     https://www.freedesktop.org/software/systemd/man/latest/sd_listen_fds.html). */
+  first_reusable_fd = 3;
+  reusable_fds = 0;
+
+  s = getenv("LISTEN_FDS");
+  if (s) {
+    errno = 0;
+    reusable_fds = strtol(s, &ptr, 10);
+    if (errno != 0 || *ptr != '\0' || reusable_fds < 0)
+      reusable_fds = 0;
+  }
+#else
+  first_reusable_fd = 0;
+  reusable_fds = 0;
+#endif
+}
+
+/* ================================================== */
+
 void
 SCK_Initialise(int family)
 {
+  int fd;
+
   ip4_enabled = family == IPADDR_INET4 || family == IPADDR_UNSPEC;
 #ifdef FEAT_IPV6
   ip6_enabled = family == IPADDR_INET6 || family == IPADDR_UNSPEC;
@@ -1196,6 +1326,9 @@ SCK_Initialise(int family)
     supported_socket_flags |= SOCK_NONBLOCK;
 #endif
 
+  for (fd = first_reusable_fd; fd < first_reusable_fd + reusable_fds; fd++)
+    UTI_FdSetCloexec(fd);
+
   initialised = 1;
 }
 
@@ -1208,6 +1341,8 @@ SCK_Finalise(void)
   ARR_DestroyInstance(recv_headers);
   ARR_DestroyInstance(recv_messages);
 
+  SCK_CloseReusableSockets();
+
   initialised = 0;
 }
 
@@ -1348,6 +1483,27 @@ SCK_OpenUnixSocketPair(int flags, int *other_fd)
 
 /* ================================================== */
 
+int
+SCK_IsReusable(int fd)
+{
+  return fd >= first_reusable_fd && fd < first_reusable_fd + reusable_fds;
+}
+
+/* ================================================== */
+
+void
+SCK_CloseReusableSockets(void)
+{
+  int fd;
+
+  for (fd = first_reusable_fd; fd < first_reusable_fd + reusable_fds; fd++)
+    close(fd);
+  reusable_fds = 0;
+  first_reusable_fd = 0;
+}
+
+/* ================================================== */
+
 int
 SCK_SetIntOption(int sock_fd, int level, int name, int value)
 {
@@ -1386,8 +1542,15 @@ SCK_EnableKernelRxTimestamping(int sock_fd)
     return 1;
 #endif
 #ifdef SO_TIMESTAMP
-  if (SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TIMESTAMP, 1))
+  if (SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TIMESTAMP, 1)) {
+#if defined(SO_TS_CLOCK) && defined(SO_TS_REALTIME)
+    /* We don't care about the return value - we'll get either a
+       SCM_REALTIME (if we succeded) or a SCM_TIMESTAMP (if we failed) */
+    if (!SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TS_CLOCK, SO_TS_REALTIME))
+      ;
+#endif
     return 1;
+  }
 #endif
 
   return 0;
@@ -1398,7 +1561,7 @@ SCK_EnableKernelRxTimestamping(int sock_fd)
 int
 SCK_ListenOnSocket(int sock_fd, int backlog)
 {
-  if (listen(sock_fd, backlog) < 0) {
+  if (!SCK_IsReusable(sock_fd) && listen(sock_fd, backlog) < 0) {
     DEBUG_LOG("listen() failed : %s", strerror(errno));
     return 0;
   }
@@ -1561,6 +1724,10 @@ SCK_RemoveSocket(int sock_fd)
 void
 SCK_CloseSocket(int sock_fd)
 {
+  /* Reusable sockets are closed in finalisation */
+  if (SCK_IsReusable(sock_fd))
+    return;
+
   close(sock_fd);
 }
 

socket.h

@@ -73,6 +73,9 @@ typedef struct {
   int descriptor;
 } SCK_Message;
 
+/* Pre-initialisation function */
+extern void SCK_PreInitialise(void);
+
 /* Initialisation function (the specified IP family is enabled,
    or all if IPADDR_UNSPEC) */
 extern void SCK_Initialise(int family);
@@ -106,6 +109,12 @@ extern int SCK_OpenUnixStreamSocket(const char *remote_addr, const char *local_a
                                     int flags);
 extern int SCK_OpenUnixSocketPair(int flags, int *other_fd);
 
+/* Check if a file descriptor was passed from the service manager */
+extern int SCK_IsReusable(int sock_fd);
+
+/* Close all reusable sockets before finalisation (e.g. in a helper process) */
+extern void SCK_CloseReusableSockets(void);
+
 /* Set and get a socket option of int size */
 extern int SCK_SetIntOption(int sock_fd, int level, int name, int value);
 extern int SCK_GetIntOption(int sock_fd, int level, int name, int *value);

sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2021
+ * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2023
  * 
  * 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
@@ -112,6 +112,9 @@ struct SRC_Instance_Record {
   /* Updates left before allowing combining */
   int distant;
 
+  /* Updates with a status requiring source replacement */
+  int bad;
+
   /* Flag indicating the status of the source */
   SRC_Status status;
 
@@ -140,6 +143,10 @@ struct SRC_Instance_Record {
 
   /* Flag indicating the source has a leap second vote */
   int leap_vote;
+
+  /* Flag indicating the source was already reported as
+     a falseticker since the last selection change */
+  int reported_falseticker;
 };
 
 /* ================================================== */
@@ -165,6 +172,11 @@ static int max_n_sources; /* Capacity of the table */
 static int selected_source_index; /* Which source index is currently
                                      selected (set to INVALID_SOURCE
                                      if no current valid reference) */
+static int reported_no_majority;  /* Flag to avoid repeated log message
+                                     about no majority */
+static int report_selection_loss; /* Flag to force logging a message if
+                                     selection is lost in a transient state
+                                     (SRC_WAITS_STATS, SRC_WAITS_UPDATE) */
 
 /* Score needed to replace the currently selected source */
 #define SCORE_LIMIT 10.0
@@ -172,12 +184,17 @@ static int selected_source_index; /* Which source index is currently
 /* Number of updates needed to reset the distant status */
 #define DISTANT_PENALTY 32
 
+/* Number of updates needed to trigger handling of bad sources */
+#define BAD_HANDLE_THRESHOLD 4
+
 static double max_distance;
 static double max_jitter;
 static double reselect_distance;
 static double stratum_weight;
 static double combine_limit;
 
+static SRC_Instance last_updated_inst;
+
 static LOG_FileID logfileid;
 
 /* Identifier of the dump file */
@@ -187,6 +204,8 @@ static LOG_FileID logfileid;
 /* Forward prototype */
 
 static void update_sel_options(void);
+static void unselect_selected_source(LOG_Severity severity, const char *format,
+                                     const char *arg);
 static void slew_sources(struct timespec *raw, struct timespec *cooked, double dfreq,
                          double doffset, LCL_ChangeType change_type, void *anything);
 static void add_dispersion(double dispersion, void *anything);
@@ -212,6 +231,8 @@ void SRC_Initialise(void) {
   LCL_AddParameterChangeHandler(slew_sources, NULL);
   LCL_AddDispersionNotifyHandler(add_dispersion, NULL);
 
+  last_updated_inst = NULL;
+
   logfileid = CNF_GetLogSelection() ? LOG_FileOpen("selection",
               "   Date (UTC) Time     IP Address   S EOpts Reach Score Last sample  Low end   High end")
               : -1;
@@ -295,7 +316,13 @@ void SRC_DestroyInstance(SRC_Instance instance)
 {
   int dead_index, i;
 
+  if (last_updated_inst == instance)
+    last_updated_inst = NULL;
+
   assert(initialised);
+  if (instance->index < 0 || instance->index >= n_sources ||
+      instance != sources[instance->index])
+    assert(0);
 
   SST_DeleteInstance(instance->stats);
   dead_index = instance->index;
@@ -308,11 +335,12 @@ void SRC_DestroyInstance(SRC_Instance instance)
 
   update_sel_options();
 
-  /* If this was the previous reference source, we have to reselect! */
-  if (selected_source_index == dead_index)
-    SRC_ReselectSource();
-  else if (selected_source_index > dead_index)
+  if (selected_source_index > dead_index)
     --selected_source_index;
+  else if (selected_source_index == dead_index)
+    unselect_selected_source(LOGS_INFO, NULL, NULL);
+
+  SRC_SelectSource(NULL);
 }
 
 /* ================================================== */
@@ -324,15 +352,20 @@ SRC_ResetInstance(SRC_Instance instance)
   instance->reachability = 0;
   instance->reachability_size = 0;
   instance->distant = 0;
+  instance->bad = 0;
   instance->status = SRC_BAD_STATS;
   instance->sel_score = 1.0;
   instance->stratum = 0;
   instance->leap = LEAP_Unsynchronised;
   instance->leap_vote = 0;
+  instance->reported_falseticker = 0;
 
   memset(&instance->sel_info, 0, sizeof (instance->sel_info));
 
   SST_ResetInstance(instance->stats);
+
+  if (selected_source_index == instance->index)
+    SRC_SelectSource(NULL);
 }
 
 /* ================================================== */
@@ -468,6 +501,19 @@ special_mode_end(void)
     return 1;
 }
 
+/* ================================================== */
+
+static void
+handle_bad_source(SRC_Instance inst)
+{
+  if (inst->type == SRC_NTP) {
+    DEBUG_LOG("Bad source status=%c", get_status_char(inst->status));
+    NSR_HandleBadSource(inst->ip_addr);
+  }
+}
+
+/* ================================================== */
+
 void
 SRC_UpdateReachability(SRC_Instance inst, int reachable)
 {
@@ -488,14 +534,9 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
     REF_SetUnsynchronised();
   }
 
-  /* Try to replace NTP sources that are unreachable, falsetickers, or
-     have root distance or jitter larger than the allowed maximums */
-  if (inst->type == SRC_NTP &&
-      ((!inst->reachability && inst->reachability_size == SOURCE_REACH_BITS) ||
-       inst->status == SRC_BAD_DISTANCE || inst->status == SRC_JITTERY ||
-       inst->status == SRC_FALSETICKER)) {
-    NSR_HandleBadSource(inst->ip_addr);
-  }
+  /* Try to replace unreachable NTP sources */
+  if (inst->reachability == 0 && inst->reachability_size == SOURCE_REACH_BITS)
+    handle_bad_source(inst);
 }
 
 /* ================================================== */
@@ -555,18 +596,17 @@ update_sel_options(void)
   for (i = 0; i < n_sources; i++) {
     options = sources[i]->conf_sel_options;
 
-    if (options & SRC_SELECT_NOSELECT)
-      continue;
-
-    switch (sources[i]->type) {
-      case SRC_NTP:
-        options |= sources[i]->authenticated ? auth_ntp_options : unauth_ntp_options;
-        break;
-      case SRC_REFCLOCK:
-        options |= refclk_options;
-        break;
-      default:
-        assert(0);
+    if (!(options & SRC_SELECT_NOSELECT)) {
+      switch (sources[i]->type) {
+        case SRC_NTP:
+          options |= sources[i]->authenticated ? auth_ntp_options : unauth_ntp_options;
+          break;
+        case SRC_REFCLOCK:
+          options |= refclk_options;
+          break;
+        default:
+          assert(0);
+      }
     }
 
     if (sources[i]->sel_options != options) {
@@ -580,17 +620,17 @@ update_sel_options(void)
 /* ================================================== */
 
 static void
-log_selection_message(const char *format, const char *arg)
+log_selection_message(LOG_Severity severity, const char *format, const char *arg)
 {
   if (REF_GetMode() != REF_ModeNormal)
     return;
-  LOG(LOGS_INFO, format, arg);
+  LOG(severity, format, arg);
 }
 
 /* ================================================== */
 
 static void
-log_selection_source(const char *format, SRC_Instance inst)
+log_selection_source(LOG_Severity severity, const char *format, SRC_Instance inst)
 {
   char buf[320], *name, *ntp_name;
 
@@ -602,7 +642,7 @@ log_selection_source(const char *format, SRC_Instance inst)
   else
     snprintf(buf, sizeof (buf), "%s", name);
 
-  log_selection_message(format, buf);
+  log_selection_message(severity, format, buf);
 }
 
 /* ================================================== */
@@ -651,11 +691,23 @@ mark_source(SRC_Instance inst, SRC_Status status)
 
   inst->status = status;
 
-  DEBUG_LOG("%s status=%c options=%x reach=%o/%d updates=%d distant=%d leap=%d vote=%d lo=%f hi=%f",
+  /* Try to replace NTP sources that are falsetickers, or have a root
+     distance or jitter larger than the allowed maximums */
+  if (inst == last_updated_inst) {
+    if (inst->bad < INT_MAX &&
+        (status == SRC_FALSETICKER || status == SRC_BAD_DISTANCE || status == SRC_JITTERY))
+      inst->bad++;
+    else
+      inst->bad = 0;
+    if (inst->bad >= BAD_HANDLE_THRESHOLD)
+      handle_bad_source(inst);
+  }
+
+  DEBUG_LOG("%s status=%c options=%x reach=%o/%d updates=%d distant=%d bad=%d leap=%d vote=%d lo=%f hi=%f",
             source_to_string(inst), get_status_char(inst->status),
             (unsigned int)inst->sel_options, (unsigned int)inst->reachability,
             inst->reachability_size, inst->updates,
-            inst->distant, (int)inst->leap, inst->leap_vote,
+            inst->distant, inst->bad, (int)inst->leap, inst->leap_vote,
             inst->sel_info.lo_limit, inst->sel_info.hi_limit);
 
   if (logfileid == -1)
@@ -690,6 +742,26 @@ mark_ok_sources(SRC_Status status)
   }
 }
 
+/* ================================================== */
+/* Reset the index of selected source and report the selection loss.  If no
+   message is provided, assume it is a transient state and wait for another
+   call providing a message or selection of another source, which resets the
+   report_selection_loss flag. */
+
+static void
+unselect_selected_source(LOG_Severity severity, const char *format, const char *arg)
+{
+  if (selected_source_index != INVALID_SOURCE) {
+    selected_source_index = INVALID_SOURCE;
+    report_selection_loss = 1;
+  }
+
+  if (report_selection_loss && format) {
+    log_selection_message(severity, format, arg);
+    report_selection_loss = 0;
+  }
+}
+
 /* ================================================== */
 
 static int
@@ -801,15 +873,13 @@ SRC_SelectSource(SRC_Instance updated_inst)
   double first_sample_ago, max_reach_sample_ago;
   NTP_Leap leap_status;
 
-  if (updated_inst)
+  if (updated_inst) {
     updated_inst->updates++;
+    last_updated_inst = updated_inst;
+  }
 
   if (n_sources == 0) {
-    /* In this case, we clearly cannot synchronise to anything */
-    if (selected_source_index != INVALID_SOURCE) {
-      log_selection_message("Can't synchronise: no sources", NULL);
-      selected_source_index = INVALID_SOURCE;
-    }
+    unselect_selected_source(LOGS_INFO, "Can't synchronise: no sources", NULL);
     return;
   }
 
@@ -994,15 +1064,13 @@ SRC_SelectSource(SRC_Instance updated_inst)
   if (n_badstats_sources && n_sel_sources && selected_source_index == INVALID_SOURCE &&
       max_sel_reach_size < SOURCE_REACH_BITS && max_sel_reach >> 1 == max_badstat_reach) {
     mark_ok_sources(SRC_WAITS_STATS);
+    unselect_selected_source(LOGS_INFO, NULL, NULL);
     return;
   }
 
   if (n_endpoints == 0) {
     /* No sources provided valid endpoints */
-    if (selected_source_index != INVALID_SOURCE) {
-      log_selection_message("Can't synchronise: no selectable sources", NULL);
-      selected_source_index = INVALID_SOURCE;
-    }
+    unselect_selected_source(LOGS_INFO, "Can't synchronise: no selectable sources", NULL);
     return;
   }
 
@@ -1080,8 +1148,13 @@ SRC_SelectSource(SRC_Instance updated_inst)
       (best_trust_depth > 0 && best_trust_depth <= n_sel_trust_sources / 2)) {
     /* Could not even get half the reachable (trusted) sources to agree */
 
+    if (!reported_no_majority) {
+      log_selection_message(LOGS_WARN, "Can't synchronise: no majority", NULL);
+      reported_no_majority = 1;
+      report_selection_loss = 0;
+    }
+
     if (selected_source_index != INVALID_SOURCE) {
-      log_selection_message("Can't synchronise: no majority", NULL);
       REF_SetUnsynchronised();
       selected_source_index = INVALID_SOURCE;
     }
@@ -1127,16 +1200,17 @@ SRC_SelectSource(SRC_Instance updated_inst)
         sel_req_source = 0;
     } else {
       mark_source(sources[i], SRC_FALSETICKER);
+      if (!sources[i]->reported_falseticker) {
+        log_selection_source(LOGS_WARN, "Detected falseticker %s", sources[i]);
+        sources[i]->reported_falseticker = 1;
+      }
     }
   }
 
   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 ? "no" :
-                            sel_req_source ? "no required source in" : "not enough");
-      selected_source_index = INVALID_SOURCE;
-    }
+    unselect_selected_source(LOGS_INFO, "Can't synchronise: %s selectable sources",
+                             !n_sel_sources ? "no" :
+                             sel_req_source ? "no required source in" : "not enough");
     mark_ok_sources(SRC_WAITS_SOURCES);
     return;
   }
@@ -1243,19 +1317,23 @@ SRC_SelectSource(SRC_Instance updated_inst)
     /* Before selecting the new synchronisation source wait until the reference
        can be updated */
     if (sources[max_score_index]->updates == 0) {
-      selected_source_index = INVALID_SOURCE;
+      unselect_selected_source(LOGS_INFO, NULL, NULL);
       mark_ok_sources(SRC_WAITS_UPDATE);
       return;
     }
 
     selected_source_index = max_score_index;
-    log_selection_source("Selected source %s", sources[selected_source_index]);
+    log_selection_source(LOGS_INFO, "Selected source %s", sources[selected_source_index]);
 
     /* New source has been selected, reset all scores */
     for (i = 0; i < n_sources; i++) {
       sources[i]->sel_score = 1.0;
       sources[i]->distant = 0;
+      sources[i]->reported_falseticker = 0;
     }
+
+    reported_no_majority = 0;
+    report_selection_loss = 0;
   }
 
   mark_source(sources[selected_source_index], SRC_SELECTED);
@@ -1546,6 +1624,8 @@ SRC_ResetSources(void)
 
   for (i = 0; i < n_sources; i++)
     SRC_ResetInstance(sources[i]);
+
+  LOG(LOGS_INFO, "Reset all sources");
 }
 
 /* ================================================== */
@@ -1593,6 +1673,46 @@ SRC_ActiveSources(void)
 
 /* ================================================== */
 
+static SRC_Instance
+find_source(IPAddr *ip, uint32_t ref_id)
+{
+  int i;
+
+  for (i = 0; i < n_sources; i++) {
+    if ((ip->family != IPADDR_UNSPEC && sources[i]->type == SRC_NTP &&
+         UTI_CompareIPs(ip, sources[i]->ip_addr, NULL) == 0) ||
+        (ip->family == IPADDR_UNSPEC && sources[i]->type == SRC_REFCLOCK &&
+         ref_id == sources[i]->ref_id))
+      return sources[i];
+  }
+
+  return NULL;
+}
+
+/* ================================================== */
+
+int
+SRC_ModifySelectOptions(IPAddr *ip, uint32_t ref_id, int options, int mask)
+{
+  SRC_Instance inst;
+
+  inst = find_source(ip, ref_id);
+  if (!inst)
+    return 0;
+
+  if ((inst->conf_sel_options & mask) == options)
+    return 1;
+
+  inst->conf_sel_options = (inst->conf_sel_options & ~mask) | options;
+  LOG(LOGS_INFO, "Source %s selection options modified", source_to_string(inst));
+
+  update_sel_options();
+
+  return 1;
+}
+
+/* ================================================== */
+
 int
 SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now)
 {

sources.h

@@ -131,6 +131,10 @@ extern int SRC_IsReachable(SRC_Instance inst);
 extern int SRC_ReadNumberOfSources(void);
 extern int SRC_ActiveSources(void);
 
+/* Modify selection options of an NTP source specified by address, or
+   refclock specified by its reference ID */
+extern int SRC_ModifySelectOptions(IPAddr *ip, uint32_t ref_id, int options, int mask);
+
 extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now);
 extern int SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec *now);
 extern int SRC_GetSelectReport(int index, RPT_SelectReport *report);

sourcestats.c

@@ -80,7 +80,7 @@ static LOG_FileID logfileid;
 
 struct SST_Stats_Record {
 
-  /* Reference ID and IP address of source, used for logging to statistics log */
+  /* Reference ID and IP address (NULL if not an NTP source) */
   uint32_t refid;
   IPAddr *ip_addr;
 
@@ -964,9 +964,10 @@ SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timespec *no
     report->latest_meas = inst->offsets[i];
     report->latest_meas_err = 0.5*inst->root_delays[j] + inst->root_dispersions[j];
 
-    /* Align the sample time to reduce the leak of the receive timestamp */
+    /* Align the sample time to reduce the leak of the NTP receive timestamp */
     last_sample_time = inst->sample_times[i];
-    last_sample_time.tv_nsec = 0;
+    if (inst->ip_addr)
+      last_sample_time.tv_nsec = 0;
     report->latest_meas_ago = UTI_DiffTimespecsToDouble(now, &last_sample_time);
   } else {
     report->latest_meas_ago = (uint32_t)-1;

stubs.c

@@ -207,6 +207,12 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
   return NSR_TooManySources;
 }
 
+const char *
+NSR_StatusToString(NSR_Status status)
+{
+  return "NTP not supported";
+}
+
 NSR_Status
 NSR_RemoveSource(IPAddr *address)
 {

sys_linux.c

@@ -35,6 +35,7 @@
 
 #if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
 #include <linux/ptp_clock.h>
+#include <poll.h>
 #endif
 
 #ifdef FEAT_SCFILTER
@@ -497,6 +498,9 @@ SYS_Linux_EnableSystemCallFilter(int level, SYS_ProcessContext context)
     SCMP_SYS(getrlimit),
     SCMP_SYS(getuid),
     SCMP_SYS(getuid32),
+#ifdef __NR_membarrier
+    SCMP_SYS(membarrier),
+#endif
 #ifdef __NR_rseq
     SCMP_SYS(rseq),
 #endif
@@ -599,6 +603,7 @@ SYS_Linux_EnableSystemCallFilter(int level, SYS_ProcessContext context)
     SCMP_SYS(select),
     SCMP_SYS(set_robust_list),
     SCMP_SYS(write),
+    SCMP_SYS(writev),
 
     /* Miscellaneous */
     SCMP_SYS(getrandom),
@@ -633,6 +638,9 @@ SYS_Linux_EnableSystemCallFilter(int level, SYS_ProcessContext context)
     { SOL_IP, IP_PKTINFO }, { SOL_IP, IP_FREEBIND }, { SOL_IP, IP_TOS },
 #ifdef FEAT_IPV6
     { SOL_IPV6, IPV6_V6ONLY }, { SOL_IPV6, IPV6_RECVPKTINFO },
+#ifdef IPV6_TCLASS
+    { SOL_IPV6, IPV6_TCLASS },
+#endif
 #endif
 #ifdef SO_BINDTODEVICE
     { SOL_SOCKET, SO_BINDTODEVICE },
@@ -650,7 +658,7 @@ SYS_Linux_EnableSystemCallFilter(int level, SYS_ProcessContext context)
   const static int fcntls[] = { F_GETFD, F_SETFD, F_GETFL, F_SETFL };
 
   const static unsigned long ioctls[] = {
-    FIONREAD, TCGETS,
+    FIONREAD, TCGETS, TIOCGWINSZ,
 #if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
     PTP_EXTTS_REQUEST, PTP_SYS_OFFSET,
 #ifdef PTP_PIN_SETFUNC
@@ -991,6 +999,16 @@ int
 SYS_Linux_ReadPHCExtTimestamp(int fd, struct timespec *phc_ts, int *channel)
 {
   struct ptp_extts_event extts_event;
+  struct pollfd pfd;
+
+  /* Make sure the read will not block in case we have multiple
+     descriptors of the same PHC (O_NONBLOCK does not work) */
+  pfd.fd = fd;
+  pfd.events = POLLIN;
+  if (poll(&pfd, 1, 0) != 1 || pfd.revents != POLLIN) {
+    DEBUG_LOG("Missing PHC extts event");
+    return 0;
+  }
 
   if (read(fd, &extts_event, sizeof (extts_event)) != sizeof (extts_event)) {
     DEBUG_LOG("Could not read PHC extts event");

test/compilation/002-scanbuild

@@ -7,9 +7,9 @@ for opts in \
 	"--host-system=NetBSD" \
 	"--host-system=FreeBSD" \
 	"--without-nettle" \
-	"--without-nettle --without-nss" \
-	"--without-nettle --without-nss --without-tomcrypt" \
-	"--without-nettle --without-nss --without-tomcrypt --without-gnutls"
+	"--without-nettle --without-gnutls" \
+	"--without-nettle --without-gnutls --without-nss" \
+	"--without-nettle --without-gnutls --without-nss --without-tomcrypt"
 do
 	./configure $opts
 	scan-build make "$@" || exit 1

test/compilation/003-sanitizers

@@ -25,12 +25,13 @@ touch Makefile
 for extra_config_opts in \
   "--all-privops" \
   "--disable-ipv6" \
+  "--disable-nts" \
   "--disable-scfilter" \
-  "--without-gnutls" \
+  "--without-aes-gcm-siv" \
   "--without-nettle" \
-  "--without-nettle --without-nss" \
-  "--without-nettle --without-nss --without-tomcrypt" \
-  "--without-nettle --without-nss --without-tomcrypt --without-gnutls"; \
+  "--without-nettle --without-gnutls" \
+  "--without-nettle --without-gnutls --without-nss" \
+  "--without-nettle --without-gnutls --without-nss --without-tomcrypt"; \
 do
   for arch_opts in "-m32" ""; do
     pushd test/simulation/clknetsim || exit 1
@@ -44,7 +45,7 @@ do
       export CC
 
       for san_options in "" "-fsanitize=address" "-fsanitize=memory"; do
-        export CFLAGS="-O2 -g -fsanitize=undefined -fsanitize=float-divide-by-zero -fno-sanitize-recover=undefined,float-divide-by-zero $san_options $arch_opts"
+        export CFLAGS="-O2 -g -fsanitize=undefined -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow -fno-sanitize-recover=all $san_options $arch_opts"
 
         # clang msan doesn't work on i686 and otherwise requires patches
         echo $CFLAGS | grep -q 'sanitize=memory' && continue

test/simulation/106-refclock

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 . ./test.common
-test_start "SHM refclock"
+test_start "reference clocks"
 
 check_config_h 'FEAT_REFCLOCK 1' || test_skip
 check_config_h 'FEAT_PHC 1' || test_skip

test/simulation/110-chronyc

@@ -91,6 +91,18 @@ check_chronyd_exit || test_fail
 check_chronyc_output "^C0A87B01,192\.168\.123\.1,2,12623049..\..........,-?0\.0000.....,-?0\.000......,0\.000......,(99|100)\....,-?[0-9]\....,[0-9]\....,0\.000......,0\.000......,[0-9]+\..,Normal$" \
 	|| test_fail
 
+chronyc_options="-c -e"
+chronyc_conf="sources"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+
+check_chronyc_output "^#,.,SHM0.*
+\^,.,192\.168\.123\.1.*
+\^,.,192\.168\.123\.2.*
+\.$" \
+	|| test_fail
+
 chronyc_options=""
 server_strata=0
 chronyc_start=0.5
@@ -102,7 +114,7 @@ limit=1
 for chronyc_conf in \
 	"accheck 1.2.3.4" \
 	"add peer 10.0.0.0 minpoll 2 maxpoll 6" \
-	"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 maxdelayquant 0.5 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323" \
+	"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 maxdelayquant 0.5 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323 extfield F324" \
 	"add server node1.net1.clk" \
 	"allow 1.2.3.4" \
 	"allow 1.2" \
@@ -164,6 +176,9 @@ for chronyc_conf in \
 	"reselectdist 1e-3" \
 	"reset sources" \
 	"selectdata" \
+	"selectopts 1.2.3.4 -noselect +trust +require +prefer" \
+	"selectopts ID#0000000001 +prefer" \
+	"selectopts PPS0 +prefer" \
 	"settime 16:30" \
 	"settime 16:30:05" \
 	"settime Nov 21, 2015 16:30:05" \
@@ -245,7 +260,13 @@ NTS-KE connections dropped : 0
 Authenticated NTP packets  : 0
 Interleaved NTP packets    : 0
 NTP timestamps held        : 0
-NTP timestamp span         : 0$" || test_fail
+NTP timestamp span         : 0
+NTP daemon RX timestamps   : 0
+NTP daemon TX timestamps   : 1
+NTP kernel RX timestamps   : 1
+NTP kernel TX timestamps   : 0
+NTP hardware RX timestamps : 0
+NTP hardware TX timestamps : 0$" || test_fail
 
 chronyc_conf="
 deny all
@@ -327,6 +348,10 @@ maxupdateskew 192.168.123.1 10.0
 minpoll 192.168.123.1 3
 minstratum 192.168.123.1 1
 polltarget 192.168.123.1 10
+selectopts 192.168.123.1 +trust +prefer -require
+selectdata
+selectopts 192.168.123.1 +noselect -prefer -trust +require
+selectdata
 delete 192.168.123.1"
 
 run_test || test_fail
@@ -345,6 +370,14 @@ check_chronyc_output "^200 OK
 200 OK
 200 OK
 200 OK
+200 OK
+S Name/IP Address        Auth COpts EOpts Last Score     Interval  Leap
+=======================================================================
+M node1\.net1\.clk            N \-PT\-\- \-PT\-\-    0   1\.0    \+0ns    \+0ns  \?
+200 OK
+S Name/IP Address        Auth COpts EOpts Last Score     Interval  Leap
+=======================================================================
+M node1\.net1\.clk            N N\-\-R\- N\-\-R\-    0   1\.0    \+0ns    \+0ns  \?
 200 OK$" || test_fail
 
 chronyc_conf="

test/simulation/114-presend

@@ -3,6 +3,7 @@
 . ./test.common
 test_start "presend option"
 
+limit=9900
 min_sync_time=136
 max_sync_time=260
 client_server_options="presend 6 maxdelay 16"
@@ -22,4 +23,29 @@ check_source_selection || test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
 
+limit=10
+base_delay=$default_base_delay
+client_conf="logdir tmp
+log measurements"
+
+client_server_options="presend 5"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_packet_interval || test_fail
+
+check_file_messages "20.*123\.1.* 111 111 0111" 1 1 measurements.log || test_fail
+check_file_messages "20.*123\.1.* 111 111 1111" 1 1 measurements.log || test_fail
+rm -f tmp/measurements.log
+
+client_server_options="presend 5 xleave"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_packet_interval || test_fail
+
+check_file_messages "20.*123\.1.* 111 111 0111" 2 2 measurements.log || test_fail
+check_file_messages "20.*123\.1.* 111 111 1111" 1 1 measurements.log || test_fail
+rm -f tmp/measurements.log
+
 test_pass

test/simulation/132-logchange

@@ -16,6 +16,6 @@ check_chronyd_exit || test_fail
 check_source_selection || test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
-check_log_messages "clock wrong by" 4 8 || test_fail
+check_log_messages "clock wrong by" 3 8 || test_fail
 
 test_pass

test/simulation/133-hwtimestamp

@@ -47,9 +47,10 @@ for client_conf in \
 		check_log_messages "Received error.*message.*tss=KH" 195 200 || test_fail
 		check_log_messages "Updated RX timestamp.*tss=1" 1 1 || test_fail
 		check_log_messages "Updated RX timestamp.*tss=2" 195 200 || test_fail
+		check_log_messages "Polling PHC" 195 220 || test_fail
 		if echo "$client_conf" | grep -q nocrossts; then
 			check_log_messages "update_tx_timestamp.*Updated" 180 200 || test_fail
-			check_log_messages "update_tx_timestamp.*Unacceptable" 0 10 || test_fail
+			check_log_messages "update_tx_timestamp.*Unacceptable" 0 13 || test_fail
 		else
 			check_log_messages "update_tx_timestamp.*Updated" 50 140 || test_fail
 			check_log_messages "update_tx_timestamp.*Unacceptable" 50 140 || test_fail
@@ -57,4 +58,32 @@ for client_conf in \
 	fi
 done
 
+server_conf+="
+server 192.168.123.2 minpoll 1 maxpoll 1 noselect"
+
+for maxpoll in -1 0 1; do
+	client_conf="hwtimestamp eth0 minpoll -1 maxpoll $maxpoll nocrossts"
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+
+	if check_config_h 'FEAT_DEBUG 1'; then
+		case $maxpoll in
+			-1)
+				check_log_messages "Polling PHC on eth0$" 360 380 || test_fail
+				check_log_messages "Polling PHC.*before" 3 25 || test_fail
+				;;
+			0)
+				check_log_messages "Polling PHC on eth0$" 8 45 || test_fail
+				check_log_messages "Polling PHC.*before" 150 190 || test_fail
+				;;
+			1)
+				check_log_messages "Polling PHC on eth0$" 1 1 || test_fail
+				check_log_messages "Polling PHC.*before" 194 199 || test_fail
+				;;
+		esac
+	fi
+done
+
 test_pass

test/simulation/139-nts

@@ -158,10 +158,10 @@ for dns in 1 0; do
 	check_source_selection && test_fail
 	check_sync && test_fail
 
-	check_file_messages "	2	1	.*	4460	" 50 100 log.packets || test_fail
+	check_file_messages "	2	1	.*	4460	" 45 100 log.packets || test_fail
 	check_file_messages "	2	2	.*	4460	" 0 0 log.packets || test_fail
-	check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 6 8 || test_fail
-	check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 6 8 || test_fail
+	check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 4 10 || test_fail
+	check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 3 10 || test_fail
 
 	servers=2
 
@@ -225,6 +225,8 @@ for dns in 1 0; do
 	check_file_messages "	3	2	.*	4460	" 0 0 log.packets || test_fail
 done
 
+min_sync_time=$[default_min_sync_time + 200]
+max_sync_time=600
 server_conf="
 ntsserverkey tmp/server1.key
 ntsservercert tmp/server1.crt
@@ -248,6 +250,8 @@ check_file_messages "	3	2	.*	123	" 0 0 log.packets || test_fail
 check_file_messages "	3	2	.*	11123	" 3 3 log.packets || test_fail
 
 dns=1
+min_sync_time=$default_min_sync_time
+max_sync_time=400
 server_conf="
 ntsserverkey tmp/server1.key
 ntsservercert tmp/server1.crt

test/simulation/142-ntpoverptp

@@ -0,0 +1,106 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "NTP over PTP"
+
+# Block communication between 3 and 1
+base_delay="(+ 1e-4 (* -1 (equal 0.1 from 3) (equal 0.1 to 1)))"
+
+cat > tmp/peer.keys <<-EOF
+1 MD5 1234567890
+EOF
+
+clients=2
+peers=2
+max_sync_time=420
+
+server_conf="
+ptpport 319"
+client_conf="
+ptpport 319
+authselectmode ignore
+keyfile tmp/peer.keys"
+client_server_options="minpoll 6 maxpoll 6 port 319"
+client_peer_options="minpoll 6 maxpoll 6 port 319 key 1"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+check_file_messages "	2	1	.*	319	319	1	96	" 150 160 \
+	log.packets || test_fail
+check_file_messages "	1	2	.*	319	319	1	96	" 150 160 \
+	log.packets || test_fail
+check_file_messages "	2	3	.*	319	319	1	116	" 150 160 \
+	log.packets || test_fail
+check_file_messages "	3	2	.*	319	319	1	116	" 150 160 \
+	log.packets || test_fail
+
+check_config_h 'HAVE_LINUX_TIMESTAMPING 1' || test_skip
+
+export CLKNETSIM_TIMESTAMPING=2
+export CLKNETSIM_LINK_SPEED=100
+
+client_server_options+=" extfield F324 minpoll 0 maxpoll 0"
+client_peer_options+=" extfield F324 minpoll 0 maxpoll 0 maxdelaydevratio 1e6"
+server_conf+="
+clockprecision 1e-9
+hwtimestamp eth0"
+client_conf+="
+clockprecision 1e-9
+hwtimestamp eth0"
+delay_correction="(+ delay (* -8e-8 (+ length 46)))"
+wander=1e-9
+limit=1000
+freq_offset=-1e-4
+min_sync_time=5
+max_sync_time=20
+time_max_limit=1e-7
+time_rms_limit=2e-8
+freq_max_limit=1e-7
+freq_rms_limit=5e-8
+client_chronyd_options="-d"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+if check_config_h 'FEAT_DEBUG 1'; then
+	check_log_messages "apply_net_correction.*Applied" 900 2100 || test_fail
+	check_log_messages "apply_net_correction.*Invalid" 0 4 || test_fail
+fi
+
+client_server_options+=" xleave"
+client_peer_options+=" xleave"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+if check_config_h 'FEAT_DEBUG 1'; then
+	check_log_messages "apply_net_correction.*Applied" 900 2100 || test_fail
+	check_log_messages "apply_net_correction.*Invalid" 0 4 || test_fail
+
+	freq_offset=0.0
+	delay_correction="(+ -1.0e-9 (* 1.0001 delay))"
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+
+	check_log_messages "apply_net_correction.*Applied" 350 1400 || test_fail
+	check_log_messages "apply_net_correction.*Invalid" 350 1400 || test_fail
+
+	server_conf="ptpport 319"
+	client_conf="ptpport 319"
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+
+	check_log_messages "apply_net_correction.*Applied" 0 0 || test_fail
+fi
+
+test_pass

test/simulation/142-ptpport

@@ -1,41 +0,0 @@
-#!/usr/bin/env bash
-
-. ./test.common
-
-test_start "PTP port"
-
-# Block communication between 3 and 1
-base_delay="(+ 1e-4 (* -1 (equal 0.1 from 3) (equal 0.1 to 1)))"
-
-cat > tmp/peer.keys <<-EOF
-1 MD5 1234567890
-EOF
-
-clients=2
-peers=2
-max_sync_time=420
-
-server_conf="
-ptpport 319"
-client_conf="
-ptpport 319
-authselectmode ignore
-keyfile tmp/peer.keys"
-client_server_options="minpoll 6 maxpoll 6 port 319"
-client_peer_options="minpoll 6 maxpoll 6 port 319 key 1"
-
-run_test || test_fail
-check_chronyd_exit || test_fail
-check_source_selection || test_fail
-check_sync || test_fail
-
-check_file_messages "	2	1	.*	319	319	1	96	" 150 160 \
-	log.packets || test_fail
-check_file_messages "	1	2	.*	319	319	1	96	" 150 160 \
-	log.packets || test_fail
-check_file_messages "	2	3	.*	319	319	1	116	" 150 160 \
-	log.packets || test_fail
-check_file_messages "	3	2	.*	319	319	1	116	" 150 160 \
-	log.packets || test_fail
-
-test_pass

test/simulation/144-monoroot

@@ -2,7 +2,7 @@
 
 . ./test.common
 
-test_start "experimental extension field"
+test_start "mono+root extension field"
 
 check_config_h 'FEAT_CMDMON 1' || test_skip
 

test/simulation/145-rtc

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+
+. ./test.common
+test_start "RTC tracking"
+
+check_config_h 'FEAT_CMDMON 1' || test_skip
+check_config_h 'FEAT_RTC 1' || test_skip
+
+export CLKNETSIM_START_DATE=$(date -d 'Jan  1 00:00:00 UTC 2010' +'%s')
+export CLKNETSIM_RTC_OFFSET=-10.0
+
+time_offset=$(awk "BEGIN {print -($freq_offset * $limit)}")
+wander=0.0
+chronyc_start=9900
+chronyc_conf="rtcdata"
+client_chronyd_options="-x"
+
+client_conf="
+hwclockfile /dev/null
+driftfile tmp/drift
+rtcfile tmp/rtc
+rtconutc"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_chronyc_output "^RTC ref time \(UTC\) : Fri Jan 01 02:4[34]:.. 2010
+Number of samples  : [0-9]+
+Number of runs     : [0-9]+
+Sample span period : [ 0-9]+
+RTC is fast by     :    -9\.01.... seconds
+RTC gains time at  :    99\.9[98]. ppm$" \
+|| test_fail
+
+export CLKNETSIM_START_DATE=$(date -d 'Jan  5 00:00:00 UTC 2010' +'%s')
+export CLKNETSIM_RTC_OFFSET=$(awk "BEGIN {print -(10.0 - 4 * 86400 * $freq_offset)}")
+touch -d 'Jan  1 00:00:00 UTC 2010' tmp/drift
+
+time_offset=10
+min_sync_time=2
+max_sync_time=12
+time_max_limit=1e-2
+freq_max_limit=1e-1
+time_rms_limit=1e-3
+freq_rms_limit=1e-3
+client_chronyd_options="-s"
+client_conf+="
+rtcautotrim 1"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+check_chronyc_output "^RTC ref time \(UTC\) : Tue Jan 05 02:4[34]:.. 2010
+Number of samples  : [0-9]+
+Number of runs     : [0-9]+
+Sample span period : [ 0-9]+
+RTC is fast by     :     0\.1..... seconds
+RTC gains time at  :    [- ]0\.0.. ppm$" \
+|| test_fail
+
+export CLKNETSIM_START_DATE=$(date -d 'Jan 10 00:00:00 UTC 2010' +'%s')
+export CLKNETSIM_RTC_OFFSET=-10.0
+touch -d 'Jan 10 00:00:00 UTC 2010' tmp/drift
+
+time_offset=-10000
+min_sync_time=1
+max_sync_time=1
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+test_pass

test/simulation/146-offline

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "online/offline switching"
+
+check_config_h 'FEAT_CMDMON 1' || test_skip
+
+servers=2
+limit=$[10 * 1800]
+client_server_conf="
+server 192.168.123.1 offline iburst
+server 192.168.123.2 polltarget 64"
+chronyc_conf="timeout 4000000
+activity
+offline
+activity
+onoffline 192.168.123.1
+online 192.168.123.2
+activity
+offline
+activity
+"
+chronyc_start=1
+base_delay="(+ 1e-4 (* 1800 (equal 0.1 from 4)))"
+jitter=1e-6
+
+time_max_limit=2e-2
+freq_max_limit=1e-3
+time_rms_limit=2e-2
+freq_rms_limit=1e-5
+min_sync_time=120
+max_sync_time=140
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_file_messages "	3	1	.*	123	" 30 90 log.packets || test_fail
+check_file_messages "	3	2	.*	123	" 130 150 log.packets || test_fail
+
+check_chronyc_output "^200 OK
+1 sources online
+1 sources offline
+0 sources doing burst \(return to online\)
+0 sources doing burst \(return to offline\)
+0 sources with unknown address
+200 OK
+200 OK
+0 sources online
+2 sources offline
+0 sources doing burst \(return to online\)
+0 sources doing burst \(return to offline\)
+0 sources with unknown address
+200 OK
+200 OK
+200 OK
+2 sources online
+0 sources offline
+0 sources doing burst \(return to online\)
+0 sources doing burst \(return to offline\)
+0 sources with unknown address
+200 OK
+200 OK
+0 sources online
+2 sources offline
+0 sources doing burst \(return to online\)
+0 sources doing burst \(return to offline\)
+0 sources with unknown address" \
+	|| test_fail
+
+test_pass

test/simulation/147-refresh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "address refreshment"
+
+limit=1000
+servers=5
+client_conf="logdir tmp
+log measurements"
+client_server_conf="server nodes-1-2.net1.clk maxpoll 6
+pool nodes-3-4-5.net1.clk maxpoll 6 maxsources 2"
+client_chronyd_options="-d"
+chronyc_conf="refresh"
+chronyc_start=500
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_file_messages "20.*192.168.123.1" 0 0 measurements.log || test_fail
+check_file_messages "20.*192.168.123.2" 15 17 measurements.log || test_fail
+check_file_messages "20.*192.168.123.[345]" 31 33 measurements.log || test_fail
+rm -f tmp/measurements.log
+if check_config_h 'FEAT_DEBUG 1'; then
+	check_log_messages "refreshing 192.168.123" 3 3 || test_fail
+	check_log_messages "resolved_name.*still fresh" 3 3 || test_fail
+fi
+
+limit=1100
+client_server_conf="
+server nodes-1-2.net1.clk maxpoll 6
+pool nodes-3-4-5.net1.clk maxpoll 6 maxsources 3"
+client_conf+="
+refresh 128"
+chronyc_conf=""
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_file_messages "20.*192.168.123.1" 0 0 measurements.log || test_fail
+check_file_messages "20.*192.168.123.2" 16 18 measurements.log || test_fail
+check_file_messages "20.*192.168.123.[345]" 50 55 measurements.log || test_fail
+rm -f tmp/measurements.log
+if check_config_h 'FEAT_DEBUG 1'; then
+	check_log_messages "refreshing 192.168.123" 8 8 || test_fail
+	check_log_messages "resolved_name.*still fresh" 8 8 || test_fail
+	check_log_messages "refreshing 192.168.123.2" 2 2 || test_fail
+	check_log_messages "refreshing 192.168.123.3" 2 2 || test_fail
+	check_log_messages "refreshing 192.168.123.4" 2 2 || test_fail
+	check_log_messages "refreshing 192.168.123.5" 2 2 || test_fail
+fi
+
+test_pass

test/simulation/148-replacement

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "source replacement"
+
+limit=5000
+client_conf="logdir tmp
+log measurements"
+
+servers=6
+falsetickers=2
+client_server_conf="pool nodes-1-2-3-4-5-6.net1.clk maxsources 5 polltarget 1 iburst"
+wander=1e-12
+jitter=1e-6
+min_sync_time=7
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_log_messages "Detected falseticker" 2 10 || test_fail
+check_log_messages "Source 192.168.123.. replaced with" 1 3 || test_fail
+check_file_messages "20.*192.168.123.* 11.1   6  6 " 15 18 measurements.log || test_fail
+check_file_messages "20.*00:[1-5].:.. 192.168.123.* 11.1   6  6 " 1 4 measurements.log || test_fail
+rm -f tmp/measurements.log
+
+# 1 unreplaceable falseticker against 2 replaceable unreachable servers
+servers=5
+falsetickers=1
+limit=200000
+base_delay="(+ 1e-4 (* -1 (equal 0.6 to 4.5)))"
+client_conf+="
+minsources 2"
+client_server_conf="
+server 192.168.123.1
+server nodes-2-4.net1.clk
+server nodes-3-5.net1.clk"
+max_sync_time=150000
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection && test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_log_messages "Detected falseticker" 2 10 || test_fail
+check_log_messages "Source 192.168.123.. replaced with" 2 70 || test_fail
+check_log_messages "2010-01-01T0[0-4]:.*Source 192.168.123.. replaced with" 2 15 || test_fail
+check_log_messages "2010-01-01T0[5-9]:.*Source 192.168.123.. replaced with" 0 15 || test_fail
+check_file_messages "20.*192.168.123.* 11.1   6  6 " 20 500 measurements.log || test_fail
+rm -f tmp/measurements.log
+
+test_pass

test/simulation/test.common

@@ -31,6 +31,7 @@ default_primary_time_offset=0.0
 default_time_offset=1e-1
 default_freq_offset=1e-4
 default_base_delay=1e-4
+default_delay_correction=""
 default_jitter=1e-4
 default_jitter_asymmetry=0.0
 default_wander=1e-9
@@ -78,6 +79,7 @@ default_client_min_mean_out_interval=0.0
 default_client_max_min_out_interval=inf
 
 default_cmdmon_unix=1
+default_pcap_dumps=0
 default_dns=0
 
 # Initialize test settings from their defaults
@@ -459,6 +461,10 @@ run_test() {
 		for j in $(seq 1 $nodes); do
 			echo "node${i}_delay${j} = $(get_delay_expr up)"
 			echo "node${j}_delay${i} = $(get_delay_expr down)"
+			if [ -n "$delay_correction" ]; then
+				echo "node${i}_delay_correction${j} = $delay_correction"
+				echo "node${j}_delay_correction${i} = $delay_correction"
+			fi
 		done
 	done > tmp/conf
 
@@ -469,6 +475,9 @@ run_test() {
 
 		for i in $(seq 1 $n); do
 			test_message 2 0 "starting node $node:"
+
+			[ $pcap_dumps -ne 0 ] && export CLKNETSIM_PCAP_DUMP=tmp/pcap.$node
+
 			if [ $stratum -eq 1 ]; then
 				step=$server_step
 				start=$server_start
@@ -509,6 +518,8 @@ run_test() {
 	for i in $(seq 1 $[$nodes - $node + 1]); do
 		test_message 2 0 "starting node $node:"
 
+		[ $pcap_dumps -ne 0 ] && export CLKNETSIM_PCAP_DUMP=tmp/pcap.$node
+
 		options=$([ $dns -eq 0 ] && printf "%s" "-n")
 		if [ $cmdmon_unix -ne 0 ]; then
 			options+=" -h /clknetsim/unix/$[$node - $clients]:1"

test/system/007-cmdmon

@@ -42,6 +42,7 @@ for command in \
 	"reselect" \
 	"reselectdist 1e-3" \
 	"reset sources" \
+	"selectopts $server -noselect +trust +prefer +require" \
 	"smoothtime reset" \
 	"smoothtime activate" \
 ; do
@@ -101,7 +102,7 @@ Total good RX   : [0-9]+$" || test_fail
 run_chronyc "selectdata" || test_fail
 check_chronyc_output "^S Name/IP Address        Auth COpts EOpts Last Score     Interval  Leap
 =======================================================================
-s 127\.0\.0\.1                 N ----- -----    0   1\.0    \+0ns    \+0ns  \?$" || test_fail
+s 127\.0\.0\.1                 N -PTR- -PTR-    0   1\.0    \+0ns    \+0ns  \?$" || test_fail
 
 run_chronyc "serverstats" || test_fail
 check_chronyc_output "^NTP packets received       : [0-9]+
@@ -114,7 +115,13 @@ NTS-KE connections dropped : 0
 Authenticated NTP packets  : 0
 Interleaved NTP packets    : 0
 NTP timestamps held        : 0
-NTP timestamp span         : 0$"|| test_fail
+NTP timestamp span         : 0
+NTP daemon RX timestamps   : 0
+NTP daemon TX timestamps   : [0-9]+
+NTP kernel RX timestamps   : [0-9]+
+NTP kernel TX timestamps   : 0
+NTP hardware RX timestamps : 0
+NTP hardware TX timestamps : 0$"|| test_fail
 
 run_chronyc "manual on" || test_fail
 check_chronyc_output "^200 OK$" || test_fail

test/system/008-confload

@@ -30,6 +30,8 @@ echo "server 127.123.4.4" > $TEST_DIR/conf4.d/4.conf
 echo "server 127.123.5.1" > $TEST_DIR/conf5.d/1.sources
 echo "server 127.123.5.2" > $TEST_DIR/conf5.d/2.sources
 echo "server 127.123.5.3" > $TEST_DIR/conf5.d/3.sources
+echo "server 127.123.5.4" > $TEST_DIR/conf5.d/4.sources
+echo "server 127.123.5.5" > $TEST_DIR/conf5.d/5.sources
 
 start_chronyd || test_fail
 
@@ -46,12 +48,16 @@ check_chronyc_output "^[^=]*
 .. 127\.123\.1\.2 [^^]*
 .. 127\.123\.5\.1 [^^]*
 .. 127\.123\.5\.2 [^^]*
-.. 127\.123\.5\.3 [^^]*$" || test_fail
+.. 127\.123\.5\.3 [^^]*
+.. 127\.123\.5\.4 [^^]*
+.. 127\.123\.5\.5 [^^]*$" || test_fail
 
 rm $TEST_DIR/conf5.d/1.sources
-echo "server 127.123.5.2 minpoll 7" > $TEST_DIR/conf5.d/2.sources
-echo > $TEST_DIR/conf5.d/3.sources
-echo "server 127.123.5.4" > $TEST_DIR/conf5.d/4.sources
+echo "server 127.123.5.2 minpoll 5" > $TEST_DIR/conf5.d/2.sources
+echo "server 127.123.5.3 minpoll 7" > $TEST_DIR/conf5.d/3.sources
+echo > $TEST_DIR/conf5.d/4.sources
+echo "server 127.123.5.5" >> $TEST_DIR/conf5.d/5.sources
+echo "server 127.123.5.6" > $TEST_DIR/conf5.d/6.sources
 
 run_chronyc "reload sources" || test_fail
 
@@ -66,9 +72,12 @@ check_chronyc_output "^[^=]*
 .. 127\.123\.2\.3 [^^]*
 .. 127\.123\.4\.4 [^^]*
 .. 127\.123\.1\.2 *[05]   6 [^^]*
-.. 127\.123\.5\.2 *[05]   7 [^^]*
-.. 127\.123\.5\.4 [^^]*$" || test_fail
+.. 127\.123\.5\.5 [^^]*
+.. 127\.123\.5\.2 *[05]   5 [^^]*
+.. 127\.123\.5\.3 *[05]   7 [^^]*
+.. 127\.123\.5\.6 [^^]*$" || test_fail
 
 stop_chronyd || test_fail
+check_chronyd_message_count "Could not add source" 1 1 || test_fail
 
 test_pass

test/system/010-nts

@@ -43,7 +43,7 @@ wait_for_sync || test_fail
 run_chronyc "authdata" || test_fail
 check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
 =========================================================================
-127\.0\.0\.1                    NTS     1   15  256    [0-9]    0    0    [78]  100$" || test_fail
+127\.0\.0\.1                    NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)$" || test_fail
 
 stop_chronyd || test_fail
 check_chronyd_messages || test_fail
@@ -57,7 +57,7 @@ wait_for_sync || test_fail
 run_chronyc "authdata" || test_fail
 check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
 =========================================================================
-127\.0\.0\.1                    NTS     1   15  256    [0-9]    0    0    [78]  100$" || test_fail
+127\.0\.0\.1                    NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)$" || test_fail
 
 stop_chronyd || test_fail
 check_chronyd_messages || test_fail

test/system/011-systemd

@@ -0,0 +1,140 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+check_chronyd_features NTS || test_skip "NTS support disabled"
+certtool --help &> /dev/null || test_skip "certtool missing"
+check_chronyd_features DEBUG || test_skip "DEBUG support disabled"
+systemd-socket-activate -h &> /dev/null || test_skip "systemd-socket-activate missing"
+has_ipv6=$(check_chronyd_features IPV6 && ping6 -c 1 ::1 > /dev/null 2>&1 && echo 1 || echo 0)
+
+test_start "systemd socket activation"
+
+cat > $TEST_DIR/cert.cfg <<EOF
+cn = "chrony-nts-test"
+dns_name = "chrony-nts-test"
+ip_address = "$server"
+$([ "$has_ipv6" = "1" ] && echo 'ip_address = "::1"')
+serial = 001
+activation_date = "$[$(date '+%Y') - 1]-01-01 00:00:00 UTC"
+expiration_date = "$[$(date '+%Y') + 2]-01-01 00:00:00 UTC"
+signing_key
+encryption_key
+EOF
+
+certtool --generate-privkey --key-type=ed25519 --outfile $TEST_DIR/server.key \
+	&> $TEST_DIR/certtool.log
+certtool --generate-self-signed --load-privkey $TEST_DIR/server.key \
+	--template $TEST_DIR/cert.cfg --outfile $TEST_DIR/server.crt &>> $TEST_DIR/certtool.log
+chown $user $TEST_DIR/server.*
+
+ntpport=$(get_free_port)
+ntsport=$(get_free_port)
+
+server_options="port $ntpport nts ntsport $ntsport"
+extra_chronyd_directives="
+port $ntpport
+ntsport $ntsport
+ntsserverkey $TEST_DIR/server.key
+ntsservercert $TEST_DIR/server.crt
+ntstrustedcerts $TEST_DIR/server.crt
+ntsdumpdir $TEST_LIBDIR
+ntsprocesses 3"
+
+if [ "$has_ipv6" = "1" ]; then
+  extra_chronyd_directives="$extra_chronyd_directives
+  bindaddress ::1
+  server ::1 minpoll -6 maxpoll -6 $server_options"
+fi
+
+# enable debug logging
+extra_chronyd_options="-L -1"
+# Hack to trigger systemd-socket-activate to activate the service.  Normally,
+# chronyd.service would be configured with the WantedBy= directive so it starts
+# without waiting for socket activation.
+# (https://0pointer.de/blog/projects/socket-activation.html).
+for i in $(seq 10); do
+  sleep 1
+  (echo "wake up" > /dev/udp/127.0.0.1/$ntpport) 2>/dev/null
+  (echo "wake up" > /dev/tcp/127.0.0.1/$ntsport) 2>/dev/null
+done &
+
+# Test with UDP sockets (unfortunately systemd-socket-activate doesn't support
+# both datagram and stream sockets in the same invocation:
+# https://github.com/systemd/systemd/issues/9983).
+CHRONYD_WRAPPER="systemd-socket-activate \
+  --datagram \
+  --listen 127.0.0.1:$ntpport \
+  --listen 127.0.0.1:$ntsport"
+if [ "$has_ipv6" = "1" ]; then
+  CHRONYD_WRAPPER="$CHRONYD_WRAPPER \
+    --listen [::1]:$ntpport \
+    --listen [::1]:$ntsport"
+fi
+
+start_chronyd || test_fail
+wait_for_sync || test_fail
+
+if [ "$has_ipv6" = "1" ]; then
+  run_chronyc "ntpdata ::1" || test_fail
+  check_chronyc_output "Total RX +: [1-9]" || test_fail
+fi
+run_chronyc "authdata" || test_fail
+check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================\
+$([ "$has_ipv6" = "1" ] && printf "\n%s\n" '::1                          NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)')
+127\.0\.0\.1                    NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)$" || test_fail
+
+stop_chronyd || test_fail
+# DGRAM ntpport socket should be used
+check_chronyd_message_count "Reusing UDPv4 socket fd=3 local=127.0.0.1:$ntpport" 1 1 || test_fail
+# DGRAM ntsport socket should be ignored
+check_chronyd_message_count "Reusing TCPv4 socket fd=4 local=127.0.0.1:$ntsport" 0 0 || test_fail
+if [ "$has_ipv6" = "1" ]; then
+  # DGRAM ntpport socket should be used
+  check_chronyd_message_count "Reusing UDPv6 socket fd=5 local=\[::1\]:$ntpport" 1 1 || test_fail
+  # DGRAM ntsport socket should be ignored
+  check_chronyd_message_count "Reusing TCPv6 socket fd=6 local=\[::1\]:$ntsport" 0 0 || test_fail
+fi
+
+check_chronyd_messages || test_fail
+check_chronyd_files || test_fail
+
+# Test with TCP sockets
+CHRONYD_WRAPPER="systemd-socket-activate \
+  --listen 127.0.0.1:$ntpport \
+  --listen 127.0.0.1:$ntsport"
+if [ "$has_ipv6" = "1" ]; then
+  CHRONYD_WRAPPER="$CHRONYD_WRAPPER \
+    --listen [::1]:$ntpport \
+    --listen [::1]:$ntsport"
+fi
+
+start_chronyd || test_fail
+wait_for_sync || test_fail
+
+if [ "$has_ipv6" = "1" ]; then
+  run_chronyc "ntpdata ::1" || test_fail
+  check_chronyc_output "Total RX +: [1-9]" || test_fail
+fi
+run_chronyc "authdata" || test_fail
+check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================\
+$([ "$has_ipv6" = "1" ] && printf "\n%s\n" '::1                          NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)')
+127\.0\.0\.1                    NTS     1   (30|15)  (128|256)    [0-9]    0    0    [78]  ( 64|100)$" || test_fail
+
+stop_chronyd || test_fail
+# STREAM ntpport should be ignored
+check_chronyd_message_count "Reusing TCPv4 socket fd=3 local=127.0.0.1:$ntpport" 0 0 || test_fail
+# STREAM ntsport should be used
+check_chronyd_message_count "Reusing TCPv4 socket fd=4 local=127.0.0.1:$ntsport" 1 1 || test_fail
+if [ "$has_ipv6" = "1" ]; then
+  # STREAM ntpport should be ignored
+  check_chronyd_message_count "Reusing TCPv6 socket fd=5 local=\[::1\]:$ntpport" 0 0 || test_fail
+  # STREAM ntsport should be used
+  check_chronyd_message_count "Reusing TCPv6 socket fd=6 local=\[::1\]:$ntsport" 1 1 || test_fail
+fi
+check_chronyd_messages || test_fail
+check_chronyd_files || test_fail
+
+test_pass

test/system/099-scfilter

@@ -6,7 +6,7 @@ check_chronyd_features SCFILTER || test_skip "SCFILTER support disabled"
 
 test_start "system call filter in non-destructive tests"
 
-for level in "-1" "1" "-2" "2"; do
+for level in 1 2 -1 -2; do
 	test_message 1 1 "level $level:"
 	for test in 0[0-8][0-9]-*[^_]; do
 		test_message 2 0 "$test"

test/system/199-scfilter

@@ -6,7 +6,7 @@ check_chronyd_features SCFILTER || test_skip "SCFILTER support disabled"
 
 test_start "system call filter in destructive tests"
 
-for level in "-1" "1" "-2" "2"; do
+for level in 1 2 -1 -2; do
 	test_message 1 1 "level $level:"
 	for test in 1[0-8][0-9]-*[^_]; do
 		test_message 2 0 "$test"

test/system/test.common

@@ -42,6 +42,8 @@ test_start() {
 		su "$user" -s /bin/sh -c "touch $TEST_DIR/test" 2> /dev/null || \
 			test_skip "$user cannot access $TEST_DIR"
 		rm "$TEST_DIR/test"
+	else
+		chown 0:0 "$TEST_DIR" || test_skip "could not chown $TEST_DIR"
 	fi
 
 	echo "Testing $*:"
@@ -322,7 +324,7 @@ check_chronyd_messages() {
 		([ "$clock_control" -ne 0 ] || grep -q 'Disabled control of system clock' "$logfile") && \
 		([ "$minimal_config" -ne 0 ] || grep -q 'Frequency .* read from' "$logfile") && \
 		grep -q 'chronyd exiting' "$logfile" && \
-		! grep -q 'Could not' "$logfile" && \
+		! (grep -v '^.\{19\}Z D:' "$logfile" | grep -q 'Could not') && \
 		! grep -q 'Disabled command socket' "$logfile" && \
 		test_ok || test_bad
 }

test/unit/array.c

@@ -0,0 +1,97 @@
+/*
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2023
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+ */
+
+#include <array.c>
+#include <util.h>
+#include "test.h"
+
+void
+test_unit(void)
+{
+  unsigned int i, j, k, k2, l, es, s;
+  unsigned char *el1, el2[20];
+  ARR_Instance a;
+
+  for (i = 0; i < 1000; i++) {
+    es = random() % sizeof (el2) + 1;
+
+    a = ARR_CreateInstance(es);
+
+    TEST_CHECK(ARR_GetSize(a) == 0);
+
+    for (j = 0; j < 100; j++) {
+      s = ARR_GetSize(a);
+
+      switch (random() % 6) {
+        case 0:
+          el1 = ARR_GetNewElement(a);
+          TEST_CHECK(ARR_GetSize(a) == s + 1);
+          memset(el1, s % 256, es);
+          TEST_CHECK(ARR_GetElement(a, s) == el1);
+          break;
+        case 1:
+          for (k = 0; k < s; k++) {
+            el1 = ARR_GetElement(a, k);
+            for (l = 0; l < es; l++)
+              TEST_CHECK(el1[l] == k % 256);
+          }
+          break;
+        case 2:
+          if (s == 0)
+            break;
+          TEST_CHECK(ARR_GetElements(a) == ARR_GetElement(a, 0));
+          break;
+        case 3:
+          memset(el2, s % 256, es);
+          ARR_AppendElement(a, el2);
+          TEST_CHECK(ARR_GetSize(a) == s + 1);
+          break;
+        case 4:
+          if (s == 0)
+            break;
+          k2 = random() % s;
+          ARR_RemoveElement(a, k2);
+          TEST_CHECK(ARR_GetSize(a) == s - 1);
+          for (k = k2; k < s - 1; k++) {
+            el1 = ARR_GetElement(a, k);
+            for (l = 0; l < es; l++) {
+              TEST_CHECK(el1[l] == (k + 1) % 256);
+              el1[l] = k % 256;
+            }
+          }
+          break;
+        case 5:
+          k2 = random() % 1000;
+          ARR_SetSize(a, k2);
+          TEST_CHECK(ARR_GetSize(a) == k2);
+          for (k = s; k < k2; k++) {
+            el1 = ARR_GetElement(a, k);
+            for (l = 0; l < es; l++)
+              el1[l] = k % 256;
+          }
+          break;
+        default:
+          assert(0);
+      }
+    }
+
+    ARR_DestroyInstance(a);
+  }
+}

test/unit/clientlog.c

@@ -36,6 +36,7 @@ test_unit(void)
 {
   uint64_t ts64, prev_first_ts64, prev_last_ts64, max_step;
   uint32_t index2, prev_first, prev_size;
+  NTP_Timestamp_Source ts_src, ts_src2;
   struct timespec ts, ts2;
   int i, j, k, index, shift;
   CLG_Service s;
@@ -95,7 +96,7 @@ test_unit(void)
   TEST_CHECK(!ntp_ts_map.timestamps);
 
   UTI_ZeroNtp64(&ntp_ts);
-  CLG_SaveNtpTimestamps(&ntp_ts, NULL);
+  CLG_SaveNtpTimestamps(&ntp_ts, NULL, 0);
   TEST_CHECK(ntp_ts_map.timestamps);
   TEST_CHECK(ntp_ts_map.first == 0);
   TEST_CHECK(ntp_ts_map.size == 0);
@@ -132,8 +133,10 @@ test_unit(void)
         UTI_ZeroTimespec(&ts);
       }
 
+      ts_src = random() % (MAX_NTP_TS + 1);
       CLG_SaveNtpTimestamps(&ntp_ts,
-                            UTI_IsZeroTimespec(&ts) ? (random() % 2 ? &ts : NULL) : &ts);
+                            UTI_IsZeroTimespec(&ts) ? (random() % 2 ? &ts : NULL) : &ts,
+                            ts_src);
 
       if (j < ntp_ts_map.max_size) {
         TEST_CHECK(ntp_ts_map.size == j + 1);
@@ -144,14 +147,15 @@ test_unit(void)
       }
       TEST_CHECK(ntp_ts_map.cached_index == ntp_ts_map.size - 1);
       TEST_CHECK(get_ntp_tss(ntp_ts_map.size - 1)->slew_epoch == ntp_ts_map.slew_epoch);
-      TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts2));
+      TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts2, &ts_src2));
       TEST_CHECK(UTI_CompareTimespecs(&ts, &ts2) == 0);
+      TEST_CHECK(UTI_IsZeroTimespec(&ts) || ts_src == ts_src2);
 
       for (k = random() % 4; k > 0; k--) {
         index2 = random() % ntp_ts_map.size;
         int64_to_ntp64(get_ntp_tss(index2)->rx_ts, &ntp_ts);
         if (random() % 2)
-          TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
+          TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
 
         UTI_Ntp64ToTimespec(&ntp_ts, &ts);
         UTI_AddDoubleToTimespec(&ts, TST_GetRandomDouble(-1.999, 1.999), &ts);
@@ -165,10 +169,12 @@ test_unit(void)
                      1.0e-9);
         }
 
-        CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts);
+        ts_src = random() % (MAX_NTP_TS + 1);
+        CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts, ts_src);
 
-        TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts2));
+        TEST_CHECK(CLG_GetNtpTxTimestamp(&ntp_ts, &ts2, &ts_src2));
         TEST_CHECK(UTI_CompareTimespecs(&ts, &ts2) == 0);
+        TEST_CHECK(ts_src == ts_src2);
 
         if (random() % 2) {
           uint16_t prev_epoch = ntp_ts_map.slew_epoch;
@@ -181,20 +187,20 @@ test_unit(void)
           index = random() % (ntp_ts_map.size - 1);
           if (get_ntp_tss(index)->rx_ts + 1 != get_ntp_tss(index + 1)->rx_ts) {
             int64_to_ntp64(get_ntp_tss(index)->rx_ts + 1, &ntp_ts);
-            TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
+            TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
             int64_to_ntp64(get_ntp_tss(index + 1)->rx_ts - 1, &ntp_ts);
-            TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
-            CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts);
+            TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
+            CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts, ts_src);
             CLG_UndoNtpTxTimestampSlew(&ntp_ts, &ts);
           }
         }
 
         if (random() % 2) {
           int64_to_ntp64(get_ntp_tss(0)->rx_ts - 1, &ntp_ts);
-          TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
+          TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
           int64_to_ntp64(get_ntp_tss(ntp_ts_map.size - 1)->rx_ts + 1, &ntp_ts);
-          TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
-          CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts);
+          TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
+          CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts, ts_src);
           CLG_UndoNtpTxTimestampSlew(&ntp_ts, &ts);
         }
       }
@@ -207,7 +213,7 @@ test_unit(void)
         while (ntp_ts_map.size < ntp_ts_map.max_size) {
           ts64 += get_random64() >> (shift + 8);
           int64_to_ntp64(ts64, &ntp_ts);
-          CLG_SaveNtpTimestamps(&ntp_ts, NULL);
+          CLG_SaveNtpTimestamps(&ntp_ts, NULL, 0);
           if (ntp_ts_map.cached_index + NTPTS_INSERT_LIMIT < ntp_ts_map.size)
             ts64 = get_ntp_tss(ntp_ts_map.size - 1)->rx_ts;
         }
@@ -228,7 +234,7 @@ test_unit(void)
       prev_size = ntp_ts_map.size;
       prev_first_ts64 = get_ntp_tss(0)->rx_ts;
       prev_last_ts64 = get_ntp_tss(prev_size - 1)->rx_ts;
-      CLG_SaveNtpTimestamps(&ntp_ts, NULL);
+      CLG_SaveNtpTimestamps(&ntp_ts, NULL, 0);
 
       TEST_CHECK(find_ntp_rx_ts(ts64, &index2));
 
@@ -259,13 +265,13 @@ test_unit(void)
 
       if (random() % 10 == 0) {
         CLG_DisableNtpTimestamps(&ntp_ts);
-        TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
+        TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
       }
 
       for (k = random() % 10; k > 0; k--) {
         ts64 = get_random64() >> shift;
         int64_to_ntp64(ts64, &ntp_ts);
-        CLG_GetNtpTxTimestamp(&ntp_ts, &ts);
+        CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2);
       }
     }
 
@@ -274,8 +280,8 @@ test_unit(void)
                   LCL_ChangeUnknownStep, NULL);
       TEST_CHECK(ntp_ts_map.size == 0);
       TEST_CHECK(ntp_ts_map.cached_rx_ts == 0ULL);
-      TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts));
-      CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts);
+      TEST_CHECK(!CLG_GetNtpTxTimestamp(&ntp_ts, &ts, &ts_src2));
+      CLG_UpdateNtpTxTimestamp(&ntp_ts, &ts, ts_src);
     }
   }
 

test/unit/ntp_core.c

@@ -1,6 +1,6 @@
 /*
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2017-2018
+ * Copyright (C) Miroslav Lichvar  2017-2018, 2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -35,6 +35,7 @@ static struct timespec current_time;
 static NTP_Packet req_buffer, res_buffer;
 static int req_length, res_length;
 
+#define NIO_IsHwTsEnabled() 1
 #define NIO_OpenServerSocket(addr) ((addr)->ip_addr.family != IPADDR_UNSPEC ? 100 : 0)
 #define NIO_CloseServerSocket(fd) assert(fd == 100)
 #define NIO_OpenClientSocket(addr) ((addr)->ip_addr.family != IPADDR_UNSPEC ? 101 : 0)
@@ -80,7 +81,7 @@ get_random_key_id(void)
 }
 
 static void
-send_request(NCR_Instance inst)
+send_request(NCR_Instance inst, int late_hwts)
 {
   NTP_Local_Address local_addr;
   NTP_Local_Timestamp local_ts;
@@ -98,12 +99,18 @@ send_request(NCR_Instance inst)
     local_addr.ip_addr.family = IPADDR_UNSPEC;
     local_addr.if_index = INVALID_IF_INDEX;
     local_addr.sock_fd = 101;
+    zero_local_timestamp(&local_ts);
     local_ts.ts = current_time;
-    local_ts.err = 0.0;
     local_ts.source = NTP_TS_KERNEL;
 
     NCR_ProcessTxKnown(inst, &local_addr, &local_ts, &req_buffer, req_length);
   }
+
+  if (late_hwts) {
+    inst->report.total_good_count++;
+  } else {
+    inst->report.total_good_count = 0;
+  }
 }
 
 static void
@@ -115,8 +122,8 @@ process_request(NTP_Remote_Address *remote_addr)
   local_addr.ip_addr.family = IPADDR_UNSPEC;
   local_addr.if_index = INVALID_IF_INDEX;
   local_addr.sock_fd = 100;
+  zero_local_timestamp(&local_ts);
   local_ts.ts = current_time;
-  local_ts.err = 0.0;
   local_ts.source = NTP_TS_KERNEL;
 
   res_length = 0;
@@ -267,7 +274,8 @@ send_response(int interleaved, int authenticated, int allow_update, int valid_ts
 }
 
 static void
-proc_response(NCR_Instance inst, int good, int valid, int updated_sync, int updated_init)
+proc_response(NCR_Instance inst, int good, int valid, int updated_sync,
+              int updated_init, int save)
 {
   NTP_Local_Address local_addr;
   NTP_Local_Timestamp local_ts;
@@ -281,8 +289,8 @@ proc_response(NCR_Instance inst, int good, int valid, int updated_sync, int upda
   local_addr.ip_addr.family = IPADDR_UNSPEC;
   local_addr.if_index = INVALID_IF_INDEX;
   local_addr.sock_fd = NTP_LVM_TO_MODE(res->lvm) != MODE_SERVER ? 100 : 101;
+  zero_local_timestamp(&local_ts);
   local_ts.ts = current_time;
-  local_ts.err = 0.0;
   local_ts.source = NTP_TS_KERNEL;
 
   prev_rx_count = inst->report.total_rx_count;
@@ -292,6 +300,19 @@ proc_response(NCR_Instance inst, int good, int valid, int updated_sync, int upda
 
   ret = NCR_ProcessRxKnown(inst, &local_addr, &local_ts, res, res_length);
 
+  if (save) {
+    TEST_CHECK(ret);
+    TEST_CHECK(inst->saved_response);
+    TEST_CHECK(inst->saved_response->timeout_id != 0);
+    TEST_CHECK(has_saved_response(inst));
+    if (random() % 2)
+      saved_response_timeout(inst);
+    else
+      transmit_timeout(inst);
+    TEST_CHECK(inst->saved_response->timeout_id == 0);
+    TEST_CHECK(!has_saved_response(inst));
+  }
+
   if (good > 0)
     TEST_CHECK(ret);
   else if (!good)
@@ -327,7 +348,7 @@ process_replay(NCR_Instance inst, NTP_Packet *packet_queue,
   do {
     res_buffer = packet_queue[random() % queue_length];
   } while (!UTI_CompareNtp64(&res_buffer.transmit_ts, &inst->remote_ntp_tx));
-  proc_response(inst, 0, 0, 0, updated_init);
+  proc_response(inst, 0, 0, 0, updated_init, 0);
   advance_time(1e-6);
 }
 
@@ -392,7 +413,7 @@ test_unit(void)
     "local",
     "keyfile ntp_core.keys"
   };
-  int i, j, k, interleaved, authenticated, valid, updated, has_updated;
+  int i, j, k, interleaved, authenticated, valid, updated, has_updated, late_hwts;
   CPS_NTP_Source source;
   NTP_Remote_Address remote_addr;
   NCR_Instance inst1, inst2;
@@ -439,6 +460,8 @@ test_unit(void)
     for (j = 0; j < 50; j++) {
       DEBUG_LOG("client/peer test iteration %d/%d", i, j);
 
+      late_hwts = random() % 2;
+      authenticated = random() % 2;
       interleaved = random() % 2 && (inst1->mode != MODE_CLIENT ||
                                      inst1->tx_count < MAX_CLIENT_INTERLEAVED_TX);
       authenticated = random() % 2;
@@ -454,35 +477,35 @@ test_unit(void)
                 (int)source.params.authkey, source.params.version,
                 interleaved, authenticated, valid, updated, has_updated);
 
-      send_request(inst1);
+      send_request(inst1, late_hwts);
 
       send_response(interleaved, authenticated, 1, 0, 1);
       DEBUG_LOG("response 1");
-      proc_response(inst1, 0, 0, 0, updated);
+      proc_response(inst1, 0, 0, 0, updated, 0);
 
       if (source.params.authkey) {
         send_response(interleaved, authenticated, 1, 1, 0);
         DEBUG_LOG("response 2");
-        proc_response(inst1, 0, 0, 0, 0);
+        proc_response(inst1, 0, 0, 0, 0, 0);
       }
 
       send_response(interleaved, authenticated, 1, 1, 1);
       DEBUG_LOG("response 3");
-      proc_response(inst1, -1, valid, valid, updated);
+      proc_response(inst1, -1, valid, valid, updated, valid && late_hwts);
       DEBUG_LOG("response 4");
-      proc_response(inst1, 0, 0, 0, 0);
+      proc_response(inst1, 0, 0, 0, 0, 0);
 
       advance_time(-1.0);
 
       send_response(interleaved, authenticated, 1, 1, 1);
       DEBUG_LOG("response 5");
-      proc_response(inst1, 0, 0, 0, updated && valid);
+      proc_response(inst1, 0, 0, 0, updated && valid, 0);
 
       advance_time(1.0);
 
       send_response(interleaved, authenticated, 1, 1, 1);
       DEBUG_LOG("response 6");
-      proc_response(inst1, 0, 0, valid && updated, updated);
+      proc_response(inst1, 0, 0, valid && updated, updated, 0);
     }
 
     NCR_DestroyInstance(inst1);
@@ -494,12 +517,12 @@ test_unit(void)
     for (j = 0; j < 20; j++) {
       DEBUG_LOG("server test iteration %d/%d", i, j);
 
-      send_request(inst1);
+      send_request(inst1, 0);
       process_request(&remote_addr);
       proc_response(inst1,
                     !source.params.interleaved || source.params.version != 4 ||
                       inst1->mode == MODE_ACTIVE || j != 2,
-                    1, 1, 0);
+                    1, 1, 0, 0);
       advance_time(1 << inst1->local_poll);
     }
 
@@ -515,7 +538,9 @@ test_unit(void)
     for (j = 0; j < 20; j++) {
       DEBUG_LOG("peer replay test iteration %d/%d", i, j);
 
-      send_request(inst1);
+      late_hwts = random() % 2;
+
+      send_request(inst1, late_hwts);
       res_buffer = req_buffer;
       assert(!res_length || res_length == req_length);
       res_length = req_length;
@@ -523,7 +548,7 @@ test_unit(void)
       TEST_CHECK(inst1->valid_timestamps == (j > 0));
 
       DEBUG_LOG("response 1->2");
-      proc_response(inst2, j > source.params.interleaved, j > 0, j > 0, 1);
+      proc_response(inst2, j > source.params.interleaved, j > 0, j > 0, 1, 0);
 
       packet_queue[(j * 2) % PACKET_QUEUE_LENGTH] = res_buffer;
 
@@ -536,14 +561,14 @@ test_unit(void)
 
       advance_time(1 << (source.params.minpoll - 1));
 
-      send_request(inst2);
+      send_request(inst2, 0);
       res_buffer = req_buffer;
       assert(res_length == req_length);
 
       TEST_CHECK(inst2->valid_timestamps == (j > 0));
 
       DEBUG_LOG("response 2->1");
-      proc_response(inst1, 1, 1, 1, 1);
+      proc_response(inst1, 1, 1, 1, 1, late_hwts);
 
       packet_queue[(j * 2 + 1) % PACKET_QUEUE_LENGTH] = res_buffer;
 

test/unit/ntp_sources.c

@@ -28,6 +28,7 @@
 #include <nameserv_async.h>
 #include <ntp_core.h>
 #include <ntp_io.h>
+#include <sched.h>
 
 static char *requested_name = NULL;
 static DNS_NameResolveHandler resolve_handler = NULL;
@@ -41,9 +42,11 @@ static void *resolve_handler_arg = NULL;
   change_remote_address(inst, remote_addr, ntp_only)
 #define NCR_ProcessRxKnown(remote_addr, local_addr, ts, msg, len) (random() % 2)
 #define NIO_IsServerConnectable(addr) (random() % 2)
+#define SCH_GetLastEventMonoTime() get_mono_time()
 
 static void change_remote_address(NCR_Instance inst, NTP_Remote_Address *remote_addr,
                                   int ntp_only);
+static double get_mono_time(void);
 
 #include <ntp_sources.c>
 
@@ -85,6 +88,8 @@ update_random_address(NTP_Remote_Address *addr, int rand_bits)
     TEST_CHECK(status == NSR_Success || status == NSR_AlreadyInUse);
   }
 
+  TEST_CHECK(strlen(NSR_StatusToString(status)) > 0);
+
   return status == NSR_Success;
 }
 
@@ -96,17 +101,26 @@ change_remote_address(NCR_Instance inst, NTP_Remote_Address *remote_addr, int nt
   TEST_CHECK(record_lock);
 
   if (update && update_pos == 0)
-    r = update_random_address(remote_addr, 4);
+    r = update_random_address(random() % 2 ? remote_addr : NCR_GetRemoteAddress(inst), 4);
 
   NCR_ChangeRemoteAddress(inst, remote_addr, ntp_only);
 
   if (update && update_pos == 1)
-    r = update_random_address(remote_addr, 4);
+    r = update_random_address(random() % 2 ? remote_addr : NCR_GetRemoteAddress(inst), 4);
 
   if (r)
     TEST_CHECK(UTI_IsIPReal(&saved_address_update.old_address.ip_addr));
 }
 
+static double get_mono_time(void) {
+  static double t = 0.0;
+
+  if (random() % 2)
+    t += TST_GetRandomDouble(0.0, 100.0);
+
+  return t;
+}
+
 void
 test_unit(void)
 {

test/unit/nts_ke_client.c

@@ -64,9 +64,12 @@ prepare_response(NKSN_Instance session, int valid)
 
   if (index != 5) {
     if (index == 6)
-      data[0] = htons(AEAD_AES_SIV_CMAC_256 + random() % 10 + 1);
+      do {
+        data[0] = htons(random() % 100);
+      } while (SIV_GetKeyLength(ntohs(data[0])) > 0);
     else
-      data[0] = htons(AEAD_AES_SIV_CMAC_256);
+      data[0] = htons(random() % 2 && SIV_GetKeyLength(AEAD_AES_128_GCM_SIV) > 0 ?
+                                      AEAD_AES_128_GCM_SIV : AEAD_AES_SIV_CMAC_256);
     if (index == 7)
       length = 3 + random() % 10;
     TEST_CHECK(NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, data, length));

test/unit/nts_ke_server.c

@@ -75,7 +75,8 @@ prepare_request(NKSN_Instance session, int valid)
     TEST_CHECK(NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, data, length));
 
   if (index != 4) {
-    data[0] = htons(AEAD_AES_SIV_CMAC_256);
+    data[0] = htons(random() % 2 && SIV_GetKeyLength(AEAD_AES_128_GCM_SIV) > 0 ?
+                    AEAD_AES_128_GCM_SIV : AEAD_AES_SIV_CMAC_256);
     if (index == 5)
       length = 0;
     else if (index == 6)
@@ -138,7 +139,7 @@ test_unit(void)
   NKSN_Instance session;
   NKE_Context context, context2;
   NKE_Cookie cookie;
-  int i, valid, l;
+  int i, j, valid, l;
   uint32_t sum, sum2;
 
   char conf[][100] = {
@@ -199,7 +200,9 @@ test_unit(void)
   save_keys();
 
   for (i = 0, sum = 0; i < MAX_SERVER_KEYS; i++) {
-    sum += server_keys[i].id + server_keys[i].key[0];
+    sum += server_keys[i].id;
+    for (j = 0; j < sizeof (server_keys[i].key); j++)
+      sum += server_keys[i].key[j];
     generate_key(i);
   }
 
@@ -207,7 +210,9 @@ test_unit(void)
   TEST_CHECK(unlink("ntskeys") == 0);
 
   for (i = 0, sum2 = 0; i < MAX_SERVER_KEYS; i++) {
-    sum2 += server_keys[i].id + server_keys[i].key[0];
+    sum2 += server_keys[i].id;
+    for (j = 0; j < sizeof (server_keys[i].key); j++)
+      sum2 += server_keys[i].key[j];
   }
 
   TEST_CHECK(sum == sum2);

test/unit/nts_ntp_auth.c

@@ -34,74 +34,97 @@ test_unit(void)
   unsigned char key[SIV_MAX_KEY_LENGTH], nonce[256], plaintext[256], plaintext2[256];
   NTP_PacketInfo info;
   NTP_Packet packet;
+  SIV_Algorithm algo;
   SIV_Instance siv;
   int i, j, r, packet_length, nonce_length, key_length;
   int plaintext_length, plaintext2_length, min_ef_length;
 
-  siv = SIV_CreateInstance(AEAD_AES_SIV_CMAC_256);
-  TEST_CHECK(siv);
+  for (algo = 1; algo < 100; algo++) {
+    siv = SIV_CreateInstance(algo);
+    if (!siv) {
+      TEST_CHECK(algo != AEAD_AES_SIV_CMAC_256);
+      continue;
+    }
 
-  for (i = 0; i < 10000; i++) {
-    key_length = SIV_GetKeyLength(AEAD_AES_SIV_CMAC_256);
-    for (j = 0; j < key_length; j++)
-      key[j] = random() % 256;
-    TEST_CHECK(SIV_SetKey(siv, key, key_length));
+    DEBUG_LOG("algo=%d", (int)algo);
 
-    nonce_length = random() % sizeof (nonce) + 1;
-    for (j = 0; j < nonce_length; j++)
-      nonce[j] = random() % 256;
+    for (i = 0; i < 10000; i++) {
+      key_length = SIV_GetKeyLength(algo);
+      for (j = 0; j < key_length; j++)
+        key[j] = random() % 256;
+      TEST_CHECK(SIV_SetKey(siv, key, key_length));
 
-    plaintext_length = random() % (sizeof (plaintext) + 1);
-    for (j = 0; j < plaintext_length; j++)
-      plaintext[j] = random() % 256;
+      assert(sizeof (nonce) >= SIV_GetMinNonceLength(siv));
+      nonce_length = SIV_GetMinNonceLength(siv) +
+                     random() % (MIN(sizeof (nonce), SIV_GetMaxNonceLength(siv)) -
+                                 SIV_GetMinNonceLength(siv) + 1);
+      for (j = 0; j < nonce_length; j++)
+        nonce[j] = random() % 256;
 
-    packet_length = NTP_HEADER_LENGTH + random() % 100 * 4;
-    min_ef_length = random() % (sizeof (packet) - packet_length);
+      plaintext_length = random() % (sizeof (plaintext) + 1);
+      for (j = 0; j < plaintext_length; j++)
+        plaintext[j] = random() % 256;
 
-    memset(&packet, 0, sizeof (packet));
-    packet.lvm = NTP_LVM(0, 4, 0);
-    memset(&info, 0, sizeof (info));
-    info.version = 4;
-    info.length = packet_length;
+      packet_length = NTP_HEADER_LENGTH + random() % 100 * 4;
+      min_ef_length = random() % (sizeof (packet) - packet_length);
 
-    DEBUG_LOG("packet_length=%d nonce_length=%d plaintext_length=%d min_ef_length=%d",
-              packet_length, nonce_length, plaintext_length, min_ef_length);
+      memset(&packet, 0, sizeof (packet));
+      packet.lvm = NTP_LVM(0, 4, 0);
+      memset(&info, 0, sizeof (info));
+      info.version = 4;
+      info.length = packet_length;
 
-    r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
-                           -1, 0);
-    TEST_CHECK(!r);
-    r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, 0, plaintext,
-                           plaintext_length, 0);
-    TEST_CHECK(!r);
-    r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
-                           plaintext_length, sizeof (packet) - info.length + 1);
-    TEST_CHECK(!r);
+      DEBUG_LOG("packet_length=%d nonce_length=%d plaintext_length=%d min_ef_length=%d",
+                packet_length, nonce_length, plaintext_length, min_ef_length);
 
-    r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
-                           plaintext_length, min_ef_length);
-    TEST_CHECK(r);
-    TEST_CHECK(info.length - packet_length >= min_ef_length);
+      r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
+                             -1, 0);
+      TEST_CHECK(!r);
+      r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, 0, plaintext,
+                             plaintext_length, 0);
+      TEST_CHECK(!r);
+      if (SIV_GetMinNonceLength(siv) > 1) {
+        r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, SIV_GetMinNonceLength(siv) - 1,
+                               plaintext, plaintext_length, 0);
+        TEST_CHECK(!r);
+        TEST_CHECK(info.ext_fields == 0);
+      }
+      if (SIV_GetMaxNonceLength(siv) <= sizeof (nonce)) {
+        r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, SIV_GetMaxNonceLength(siv) - 1,
+                               plaintext, plaintext_length, 0);
+        TEST_CHECK(!r);
+        TEST_CHECK(info.ext_fields == 0);
+      }
+      r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
+                             plaintext_length, sizeof (packet) - info.length + 1);
+      TEST_CHECK(!r);
 
-    r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
-                          -1, &plaintext2_length);
-    TEST_CHECK(!r);
+      r = NNA_GenerateAuthEF(&packet, &info, siv, nonce, nonce_length, plaintext,
+                             plaintext_length, min_ef_length);
+      TEST_CHECK(r);
+      TEST_CHECK(info.length - packet_length >= min_ef_length);
 
-    r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
-                          sizeof (plaintext2), &plaintext2_length);
-    TEST_CHECK(r);
-    TEST_CHECK(plaintext_length == plaintext2_length);
-    TEST_CHECK(memcmp(plaintext, plaintext2, plaintext_length) == 0);
+      r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
+                            -1, &plaintext2_length);
+      TEST_CHECK(!r);
 
-    j = random() % (packet_length + plaintext_length +
-                    nonce_length + SIV_GetTagLength(siv) + 8) / 4 * 4;
-    ((unsigned char *)&packet)[j]++;
-    r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
-                          sizeof (plaintext2), &plaintext2_length);
-    TEST_CHECK(!r);
-    ((unsigned char *)&packet)[j]--;
+      r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
+                            sizeof (plaintext2), &plaintext2_length);
+      TEST_CHECK(r);
+      TEST_CHECK(plaintext_length == plaintext2_length);
+      TEST_CHECK(memcmp(plaintext, plaintext2, plaintext_length) == 0);
+
+      j = random() % (packet_length + plaintext_length +
+                      nonce_length + SIV_GetTagLength(siv) + 8) / 4 * 4;
+      ((unsigned char *)&packet)[j]++;
+      r = NNA_DecryptAuthEF(&packet, &info, siv, packet_length, plaintext2,
+                            sizeof (plaintext2), &plaintext2_length);
+      TEST_CHECK(!r);
+      ((unsigned char *)&packet)[j]--;
+    }
+
+    SIV_DestroyInstance(siv);
   }
-
-  SIV_DestroyInstance(siv);
 }
 #else
 void