doc: update NEWS

Modify the code to avoid making the following calls incorrectly reported
as important findings by the coverity static analyzer:

- memset() of size 0 at the end of an array
- mktime() on a struct tm that has uninitialized tm_yday

Makefile.in

@@ -37,7 +37,9 @@ 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 \
+OBJS = addrfilt.o array.o clientlog.o cmdparse.o conf.o keys.o leapdb.o \
+       local.o logging.o main.o memory.o nameserv.o nameserv_async.o \
+       ntp_auth.o ntp_core.o ntp_ext.o ntp_io.o ntp_sources.o quantiles.o \
        reference.o regress.o rtc.o samplefilt.o sched.o socket.o sources.o sourcestats.o \
        stubs.o smooth.o sys.o sys_null.o tempcomp.o util.o $(EXTRA_OBJS)
 

NEWS

@@ -1,3 +1,66 @@
+New in version 4.7
+==================
+
+Enhancements
+------------
+* Add opencommands directive to select remote monitoring commands
+* Add interval option to driftfile directive
+* Add waitsynced and waitunsynced options to local directive
+* Add sanity checks for integer values in configuration
+* Add support for systemd Type=notify service
+* Add RTC refclock driver
+* Allow PHC refclock to be specified with network interface name
+* Don't require multiple refclock samples per poll to simplify
+  filter configuration
+* Keep refclock reachable when dropping samples with large delay
+* Improve quantile-based filtering to adapt faster to larger delay
+* Improve logging of selection failures
+* Detect clock interference from other processes
+
+Bug fixes
+---------
+* Fix tracking offset after failed clock step
+
+Removed features
+----------------
+* Drop support for NTS with Nettle < 3.6 and GnuTLS < 3.6.14
+* Drop support for building without POSIX threads
+
+New in version 4.6.1
+====================
+
+Enhancements
+------------
+* Add ntsaeads directive to enable only selected AEAD algorithms for NTS
+
+Workarounds
+-----------
+* Negotiate use of compliant NTS keys with AES-128-GCM-SIV AEAD algorithm
+  (by default the keys are generated differently than in RFC 8915 for
+  compatibility with chrony server and client versions 4.4, 4.5, and 4.6)
+* Switch to compliant NTS keys if first response from server is NTS NAK
+
+New in version 4.6
+==================
+
+Enhancements
+------------
+* Add activate option to local directive to set activation threshold
+* Add ipv4 and ipv6 options to server/pool/peer directive
+* Add kod option to ratelimit directive for server KoD RATE support
+* Add leapseclist directive to read NIST/IERS leap-seconds.list file
+* Add ptpdomain directive to set PTP domain for NTP over PTP
+* Allow disabling pidfile
+* Improve copy server option to accept unsynchronised status instantly
+* Log one selection failure on start
+* Add offset command to modify source offset correction
+* Add timestamp sources to ntpdata report
+
+Bug fixes
+---------
+* Fix crash on sources reload during initstepslew or RTC initialisation
+* Fix source refreshment to not repeat failed name resolving attempts
+
 New in version 4.5
 ==================
 

README

@@ -12,7 +12,7 @@ a time service to other computers in the network.
 It is designed to perform well in a wide range of conditions, including
 intermittent network connections, heavily congested networks, changing
 temperatures (ordinary computer clocks are sensitive to temperature),
-and systems that do not run continuosly, or run on a virtual machine.
+and systems that do not run continuously, or run on a virtual machine.
 
 Typical accuracy between two machines synchronised over the Internet is
 within a few milliseconds; on a LAN, accuracy is typically in tens of
@@ -75,6 +75,7 @@ Lonnie Abelbeck <lonnie@abelbeck.com>
 Benny Lyne Amorsen <benny@amorsen.dk>
 Andrew Bishop <amb@gedanken.demon.co.uk>
 Vincent Blut <vincent.debian@free.fr>
+Luca Boccassi <bluca@debian.org>
 Stephan I. Boettcher <stephan@nevis1.columbia.edu>
 David Bohman <debohman@gmail.com>
 Goswin Brederlow <brederlo@informatik.uni-tuebingen.de>
@@ -83,13 +84,18 @@ Erik Bryer <ebryer@spots.ab.ca>
 Jonathan Cameron <jic23@cam.ac.uk>
 Bryan Christianson <bryan@whatroute.net>
 Juliusz Chroboczek <jch@pps.jussieu.fr>
+Paul Donald <newtwen+gitlab@gmail.com>
 Dan Drown <dan-ntp@drown.org>
 Kamil Dudka <kdudka@redhat.com>
 Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Paul Elliott <pelliott@io.com>
 Robert Fairley <rfairley@redhat.com>
+Ahmad Fatoum <a.fatoum@pengutronix.de>
+Andreas Fenkart <extern-afe@mission-embedded.com>
 Stefan R. Filipek <srfilipek@gmail.com>
+Andy Fiddaman <illumos@fiddaman.net>
 Mike Fleetwood <mike@rockover.demon.co.uk>
+Rob Gill <rrobgill@protonmail.com>
 Alexander Gretencord <arutha@gmx.de>
 Andrew Griffiths <agriffit@redhat.com>
 Walter Haidinger <walter.haidinger@gmx.at>
@@ -111,12 +117,14 @@ Paul Menzel <paulepanter@users.sourceforge.net>
 Vladimir Michl <vladimir.michl@seznam.cz>
 Victor Moroz <vim@prv.adlum.ru>
 Kalle Olavi Niemitalo  <tosi@stekt.oulu.fi>
+Patrick Oppenlander <patrick.oppenlander@gmail.com>
 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>
+Shachar Raindel <shacharr@google.com>
 Mike Ryan <msr@hsilop.net>
 Baruch Siach <baruch@tkos.co.il>
 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

candm.h

@@ -37,7 +37,6 @@
 #define DEFAULT_CANDM_PORT 323
 
 /* Request codes */
-#define REQ_NULL 0
 #define REQ_ONLINE 1
 #define REQ_OFFLINE 2
 #define REQ_BURST 3
@@ -110,7 +109,9 @@
 #define REQ_RELOAD_SOURCES 70
 #define REQ_DOFFSET2 71
 #define REQ_MODIFY_SELECTOPTS 72
-#define N_REQUEST_TYPES 73
+#define REQ_MODIFY_OFFSET 73
+#define REQ_LOCAL3 74
+#define N_REQUEST_TYPES 75
 
 /* Structure used to exchange timespecs independent of time_t size */
 typedef struct {
@@ -221,11 +222,6 @@ typedef struct {
   int32_t EOR;
 } REQ_Modify_Makestep;
 
-typedef struct {
-  Timespec ts;
-  int32_t EOR;
-} REQ_Logon;
-
 typedef struct {
   Timespec ts;
   int32_t EOR;
@@ -236,6 +232,9 @@ typedef struct {
   int32_t stratum;
   Float distance;
   int32_t orphan;
+  Float activate;
+  Float wait_synced;
+  Float wait_unsynced;
   int32_t EOR;
 } REQ_Local;
 
@@ -279,6 +278,8 @@ typedef struct {
 #define REQ_ADDSRC_COPY 0x400
 #define REQ_ADDSRC_EF_EXP_MONO_ROOT 0x800
 #define REQ_ADDSRC_EF_EXP_NET_CORRECTION 0x1000
+#define REQ_ADDSRC_IPV4 0x2000
+#define REQ_ADDSRC_IPV6 0x4000
 
 typedef struct {
   uint32_t type;
@@ -388,6 +389,13 @@ typedef struct {
   int32_t EOR;
 } REQ_Modify_SelectOpts;
 
+typedef struct {
+  IPAddr address;
+  uint32_t ref_id;
+  Float new_offset;
+  int32_t EOR;
+} REQ_Modify_Offset;
+
 /* ================================================== */
 
 #define PKT_TYPE_CMD_REQUEST 1
@@ -474,7 +482,6 @@ typedef struct {
     REQ_Modify_Polltarget modify_polltarget;
     REQ_Modify_Maxupdateskew modify_maxupdateskew;
     REQ_Modify_Makestep modify_makestep;
-    REQ_Logon logon;
     REQ_Settime settime;
     REQ_Local local;
     REQ_Manual manual;
@@ -495,6 +502,7 @@ typedef struct {
     REQ_AuthData auth_data;
     REQ_SelectData select_data;
     REQ_Modify_SelectOpts modify_select_opts;
+    REQ_Modify_Offset modify_offset;
   } data; /* Command specific parameters */
 
   /* Padding used to prevent traffic amplification.  It only defines the
@@ -503,13 +511,6 @@ typedef struct {
 
 } CMD_Request;
 
-/* ================================================== */
-/* Authority codes for command types */
-
-#define PERMIT_OPEN 0
-#define PERMIT_LOCAL 1
-#define PERMIT_AUTH 2
-
 /* ================================================== */
 
 /* Reply codes */
@@ -538,7 +539,8 @@ typedef struct {
 #define RPY_SELECT_DATA 23
 #define RPY_SERVER_STATS3 24
 #define RPY_SERVER_STATS4 25
-#define N_REPLY_TYPES 26
+#define RPY_NTP_DATA2 26
+#define N_REPLY_TYPES 27
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -761,7 +763,11 @@ typedef struct {
   uint32_t total_rx_count;
   uint32_t total_valid_count;
   uint32_t total_good_count;
-  uint32_t reserved[3];
+  uint32_t total_kernel_tx_ts;
+  uint32_t total_kernel_rx_ts;
+  uint32_t total_hw_tx_ts;
+  uint32_t total_hw_rx_ts;
+  uint32_t reserved[4];
   int32_t EOR;
 } RPY_NTPData;
 

client.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Lonnie Abelbeck  2016, 2018
- * Copyright (C) Miroslav Lichvar  2009-2023
+ * Copyright (C) Miroslav Lichvar  2009-2024
  * 
  * 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
@@ -125,12 +125,11 @@ read_line(void)
       strncpy(line, cmd, sizeof(line) - 1);
       line[sizeof(line) - 1] = '\0';
       add_history(cmd);
-      /* free the buffer allocated by readline */
-      Free(cmd);
     } else {
       /* simulate the user has entered an empty line */
       *line = '\0';
     }
+    Free(cmd);
     return( line );
 #else
     printf("%s", prompt);
@@ -344,6 +343,24 @@ parse_source_address(char *word, IPAddr *address)
 
 /* ================================================== */
 
+static int
+parse_source_address_or_refid(char *s, IPAddr *address, uint32_t *ref_id)
+{
+  address->family = IPADDR_UNSPEC;
+  *ref_id = 0;
+
+  /* Don't allow hostnames to avoid conflicts with reference IDs */
+  if (UTI_StringToIdIP(s, address) || UTI_StringToIP(s, address))
+    return 1;
+
+  if (CPS_ParseRefid(s, ref_id) > 0)
+    return 1;
+
+  return 0;
+}
+
+/* ================================================== */
+
 static int
 read_mask_address(char *line, IPAddr *mask, IPAddr *address)
 {
@@ -736,23 +753,27 @@ process_cmd_burst(CMD_Request *msg, char *line)
 static int
 process_cmd_local(CMD_Request *msg, char *line)
 {
+  double distance = 0.0, activate = 0.0, wait_synced = 0.0, wait_unsynced = 0.0;
   int on_off, stratum = 0, orphan = 0;
-  double distance = 0.0;
 
   if (!strcmp(line, "off")) {
     on_off = 0;
-  } else if (CPS_ParseLocal(line, &stratum, &orphan, &distance)) {
+  } else if (CPS_ParseLocal(line, &stratum, &orphan, &distance, &activate,
+                            &wait_synced, &wait_unsynced) == CPS_Success) {
     on_off = 1;
   } else {
     LOG(LOGS_ERR, "Invalid syntax for local command");
     return 0;
   }
 
-  msg->command = htons(REQ_LOCAL2);
+  msg->command = htons(REQ_LOCAL3);
   msg->data.local.on_off = htonl(on_off);
   msg->data.local.stratum = htonl(stratum);
   msg->data.local.distance = UTI_FloatHostToNetwork(distance);
   msg->data.local.orphan = htonl(orphan);
+  msg->data.local.activate = UTI_FloatHostToNetwork(activate);
+  msg->data.local.wait_synced = UTI_FloatHostToNetwork(wait_synced);
+  msg->data.local.wait_unsynced = UTI_FloatHostToNetwork(wait_unsynced);
 
   return 1;
 }
@@ -886,8 +907,9 @@ static int
 process_cmd_add_source(CMD_Request *msg, char *line)
 {
   CPS_NTP_Source data;
+  CPS_Status status;
   IPAddr ip_addr;
-  int result = 0, status, type;
+  int result = 0, type;
   const char *opt_name, *word;
   
   msg->command = htons(REQ_ADD_SOURCE);
@@ -908,10 +930,7 @@ process_cmd_add_source(CMD_Request *msg, char *line)
 
   status = CPS_ParseNTPSourceAdd(line, &data);
   switch (status) {
-    case 0:
-      LOG(LOGS_ERR, "Invalid syntax for add command");
-      break;
-    default:
+    case CPS_Success:
       /* Verify that the address is resolvable (chronyc and chronyd are
          assumed to be running on the same host) */
       if (strlen(data.name) >= sizeof (msg->data.ntp_source.name) ||
@@ -927,8 +946,7 @@ process_cmd_add_source(CMD_Request *msg, char *line)
       }
 
       msg->data.ntp_source.type = htonl(type);
-      if (strlen(data.name) >= sizeof (msg->data.ntp_source.name))
-        assert(0);
+      BRIEF_ASSERT(strlen(data.name) < sizeof (msg->data.ntp_source.name));
       strncpy((char *)msg->data.ntp_source.name, data.name,
               sizeof (msg->data.ntp_source.name));
       msg->data.ntp_source.port = htonl(data.port);
@@ -962,6 +980,8 @@ process_cmd_add_source(CMD_Request *msg, char *line)
            REQ_ADDSRC_EF_EXP_MONO_ROOT : 0) |
           (data.params.ext_fields & NTP_EF_FLAG_EXP_NET_CORRECTION ?
            REQ_ADDSRC_EF_EXP_NET_CORRECTION : 0) |
+          (data.family == IPADDR_INET4 ? REQ_ADDSRC_IPV4 : 0) |
+          (data.family == IPADDR_INET6 ? REQ_ADDSRC_IPV6 : 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);
@@ -971,6 +991,15 @@ process_cmd_add_source(CMD_Request *msg, char *line)
 
       result = 1;
 
+      break;
+    case CPS_InvalidOption:
+      LOG(LOGS_ERR, "Invalid %s add command", "option in");
+      break;
+    case CPS_InvalidValue:
+      LOG(LOGS_ERR, "Invalid %s add command", "value in");
+      break;
+    default:
+      LOG(LOGS_ERR, "Invalid %s add command", "syntax for");
       break;
   }
 
@@ -1029,6 +1058,7 @@ give_help(void)
     "selectopts <address|refid> <+|-options>\0Modify selection options\0"
     "reselect\0Force reselecting synchronisation source\0"
     "reselectdist <dist>\0Modify reselection distance\0"
+    "offset <address|refid> <offset>\0Modify offset correction\0"
     "\0\0"
     "NTP sources:\0\0"
     "activity\0Check how many NTP sources are online/offline\0"
@@ -1139,7 +1169,8 @@ command_name_generator(const char *text, int state)
     "clients", "cmdaccheck", "cmdallow", "cmddeny", "cyclelogs", "delete",
     "deny", "dns", "dump", "exit", "help", "keygen", "local", "makestep",
     "manual", "maxdelay", "maxdelaydevratio", "maxdelayratio", "maxpoll",
-    "maxupdateskew", "minpoll", "minstratum", "ntpdata", "offline", "online", "onoffline",
+    "maxupdateskew", "minpoll", "minstratum", "ntpdata",
+    "offline", "offset", "online", "onoffline",
     "polltarget", "quit", "refresh", "rekey", "reload", "reselect", "reselectdist", "reset",
     "retries", "rtcdata", "selectdata", "selectopts", "serverstats", "settime",
     "shutdown", "smoothing", "smoothtime", "sourcename", "sources", "sourcestats",
@@ -2329,7 +2360,7 @@ process_cmd_ntpdata(char *line)
 
     request.command = htons(REQ_NTP_DATA);
     UTI_IPHostToNetwork(&remote_addr, &request.data.ntp_data.ip_addr);
-    if (!request_reply(&request, &reply, RPY_NTP_DATA, 0))
+    if (!request_reply(&request, &reply, RPY_NTP_DATA2, 0))
       return 0;
 
     UTI_IPNetworkToHost(&reply.data.ntp_data.remote_addr, &remote_addr);
@@ -2365,7 +2396,11 @@ process_cmd_ntpdata(char *line)
                  "Total TX        : %U\n"
                  "Total RX        : %U\n"
                  "Total valid RX  : %U\n"
-                 "Total good RX   : %U\n",
+                 "Total good RX   : %U\n"
+                 "Total kernel TX : %U\n"
+                 "Total kernel RX : %U\n"
+                 "Total HW TX     : %U\n"
+                 "Total HW RX     : %U\n",
                  UTI_IPToString(&remote_addr), UTI_IPToRefid(&remote_addr),
                  ntohs(reply.data.ntp_data.remote_port),
                  UTI_IPToString(&local_addr), UTI_IPToRefid(&local_addr),
@@ -2393,6 +2428,10 @@ process_cmd_ntpdata(char *line)
                  ntohl(reply.data.ntp_data.total_rx_count),
                  ntohl(reply.data.ntp_data.total_valid_count),
                  ntohl(reply.data.ntp_data.total_good_count),
+                 ntohl(reply.data.ntp_data.total_kernel_tx_ts),
+                 ntohl(reply.data.ntp_data.total_kernel_rx_ts),
+                 ntohl(reply.data.ntp_data.total_hw_tx_ts),
+                 ntohl(reply.data.ntp_data.total_hw_rx_ts),
                  REPORT_END);
   }
 
@@ -2848,6 +2887,34 @@ process_cmd_activity(const char *line)
 
 /* ================================================== */
 
+static int
+process_cmd_offset(CMD_Request *msg, char *line)
+{
+  uint32_t ref_id;
+  IPAddr ip_addr;
+  double offset;
+  char *src;
+
+  src = line;
+  line = CPS_SplitWord(line);
+
+  if (!parse_source_address_or_refid(src, &ip_addr, &ref_id) ||
+      sscanf(line, "%lf", &offset) != 1) {
+    LOG(LOGS_ERR, "Invalid syntax for offset command");
+    return 0;
+  }
+
+  UTI_IPHostToNetwork(&ip_addr, &msg->data.modify_offset.address);
+  msg->data.modify_offset.ref_id = htonl(ref_id);
+  msg->data.modify_offset.new_offset = UTI_FloatHostToNetwork(offset);
+
+  msg->command = htons(REQ_MODIFY_OFFSET);
+
+  return 1;
+}
+
+/* ================================================== */
+
 static int
 process_cmd_reselectdist(CMD_Request *msg, char *line)
 {
@@ -2929,15 +2996,10 @@ process_cmd_selectopts(CMD_Request *msg, char *line)
 
   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;
-    }
+  if (!parse_source_address_or_refid(src, &ip_addr, &ref_id)) {
+    LOG(LOGS_ERR, "Invalid syntax for selectopts command");
+    return 0;
   }
 
   mask = options = 0;
@@ -3239,6 +3301,8 @@ process_line(char *line)
     ret = process_cmd_ntpdata(line);
   } else if (!strcmp(command, "offline")) {
     do_normal_submit = process_cmd_offline(&tx_message, line);
+  } else if (!strcmp(command, "offset")) {
+    do_normal_submit = process_cmd_offset(&tx_message, line);
   } else if (!strcmp(command, "online")) {
     do_normal_submit = process_cmd_online(&tx_message, line);
   } else if (!strcmp(command, "onoffline")) {
@@ -3383,7 +3447,7 @@ static void
 display_gpl(void)
 {
     printf("chrony version %s\n"
-           "Copyright (C) 1997-2003, 2007, 2009-2023 Richard P. Curnow and others\n"
+           "Copyright (C) 1997-2003, 2007, 2009-2024 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",
@@ -3531,6 +3595,7 @@ main(int argc, char **argv)
   close_io();
   free_addresses(server_addresses);
   SCK_Finalise();
+  UTI_ResetGetRandomFunctions();
 
   return !ret;
 }

clientlog.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009, 2015-2017, 2021
+ * Copyright (C) Miroslav Lichvar  2009, 2015-2017, 2021, 2024
  * 
  * 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
@@ -117,6 +117,14 @@ static int token_shift[MAX_SERVICES];
 
 static int leak_rate[MAX_SERVICES];
 
+/* Rates at which responses requesting clients to reduce their rate
+   (e.g. NTP KoD RATE) are randomly allowed (in log2, but 0 means disabled) */
+
+#define MIN_KOD_RATE 0
+#define MAX_KOD_RATE 4
+
+static int kod_rate[MAX_SERVICES];
+
 /* Limit intervals in log2 */
 static int limit_interval[MAX_SERVICES];
 
@@ -257,16 +265,13 @@ get_record(IPAddr *ip)
   }
 
   record->ip_addr = *ip;
-  for (i = 0; i < MAX_SERVICES; i++)
+  for (i = 0; i < MAX_SERVICES; i++) {
     record->last_hit[i] = INVALID_TS;
-  for (i = 0; i < MAX_SERVICES; i++)
     record->hits[i] = 0;
-  for (i = 0; i < MAX_SERVICES; i++)
     record->drops[i] = 0;
-  for (i = 0; i < MAX_SERVICES; i++)
     record->tokens[i] = max_tokens[i];
-  for (i = 0; i < MAX_SERVICES; i++)
     record->rate[i] = INVALID_RATE;
+  }
   record->ntp_timeout_rate = INVALID_RATE;
   record->drop_flags = 0;
 
@@ -354,18 +359,19 @@ set_bucket_params(int interval, int burst, uint16_t *max_tokens,
 void
 CLG_Initialise(void)
 {
-  int i, interval, burst, lrate, slots2;
+  int i, interval, burst, lrate, krate, slots2;
 
   for (i = 0; i < MAX_SERVICES; i++) {
     max_tokens[i] = 0;
     tokens_per_hit[i] = 0;
     token_shift[i] = 0;
     leak_rate[i] = 0;
+    kod_rate[i] = 0;
     limit_interval[i] = MIN_LIMIT_INTERVAL;
 
     switch (i) {
       case CLG_NTP:
-        if (!CNF_GetNTPRateLimit(&interval, &burst, &lrate))
+        if (!CNF_GetNTPRateLimit(&interval, &burst, &lrate, &krate))
           continue;
         break;
       case CLG_NTSKE:
@@ -382,6 +388,7 @@ CLG_Initialise(void)
 
     set_bucket_params(interval, burst, &max_tokens[i], &tokens_per_hit[i], &token_shift[i]);
     leak_rate[i] = CLAMP(MIN_LEAK_RATE, lrate, MAX_LEAK_RATE);
+    kod_rate[i] = CLAMP(MIN_KOD_RATE, krate, MAX_KOD_RATE);
     limit_interval[i] = CLAMP(MIN_LIMIT_INTERVAL, interval, MAX_LIMIT_INTERVAL);
   }
 
@@ -579,28 +586,28 @@ CLG_LogServiceAccess(CLG_Service service, IPAddr *client, struct timespec *now)
 /* ================================================== */
 
 static int
-limit_response_random(int leak_rate)
+limit_response_random(int rate)
 {
   static uint32_t rnd;
   static int bits_left = 0;
   int r;
 
-  if (bits_left < leak_rate) {
+  if (bits_left < rate) {
     UTI_GetRandomBytes(&rnd, sizeof (rnd));
     bits_left = 8 * sizeof (rnd);
   }
 
-  /* Return zero on average once per 2^leak_rate */
-  r = rnd % (1U << leak_rate) ? 1 : 0;
-  rnd >>= leak_rate;
-  bits_left -= leak_rate;
+  /* Return zero on average once per 2^rate */
+  r = rnd % (1U << rate) ? 1 : 0;
+  rnd >>= rate;
+  bits_left -= rate;
 
   return r;
 }
 
 /* ================================================== */
 
-int
+CLG_Limit
 CLG_LimitServiceRate(CLG_Service service, int index)
 {
   Record *record;
@@ -609,14 +616,14 @@ CLG_LimitServiceRate(CLG_Service service, int index)
   check_service_number(service);
 
   if (tokens_per_hit[service] == 0)
-    return 0;
+    return CLG_PASS;
 
   record = ARR_GetElement(records, index);
   record->drop_flags &= ~(1U << service);
 
   if (record->tokens[service] >= tokens_per_hit[service]) {
     record->tokens[service] -= tokens_per_hit[service];
-    return 0;
+    return CLG_PASS;
   }
 
   drop = limit_response_random(leak_rate[service]);
@@ -632,14 +639,18 @@ CLG_LimitServiceRate(CLG_Service service, int index)
 
   if (!drop) {
     record->tokens[service] = 0;
-    return 0;
+    return CLG_PASS;
+  }
+
+  if (kod_rate[service] > 0 && !limit_response_random(kod_rate[service])) {
+    return CLG_KOD;
   }
 
   record->drop_flags |= 1U << service;
   record->drops[service]++;
   total_drops[service]++;
 
-  return 1;
+  return CLG_DROP;
 }
 
 /* ================================================== */

clientlog.h

@@ -37,11 +37,17 @@ typedef enum {
   CLG_CMDMON,
 } CLG_Service;
 
+typedef enum {
+  CLG_PASS = 0,
+  CLG_DROP,
+  CLG_KOD,
+} CLG_Limit;
+
 extern void CLG_Initialise(void);
 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 CLG_Limit CLG_LimitServiceRate(CLG_Service service, int index);
 extern void CLG_UpdateNtpStats(int auth, NTP_Timestamp_Source rx_ts_src,
                                NTP_Timestamp_Source tx_ts_src);
 extern int CLG_GetNtpMinPoll(void);

cmdmon.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2023
+ * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2024
  * 
  * 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
@@ -68,85 +68,6 @@ static int bound_sock_fd4;
 /* Flag indicating whether this module has been initialised or not */
 static int initialised = 0;
 
-/* ================================================== */
-/* Array of permission levels for command types */
-
-static const char permissions[] = {
-  PERMIT_OPEN, /* NULL */
-  PERMIT_AUTH, /* ONLINE */
-  PERMIT_AUTH, /* OFFLINE */
-  PERMIT_AUTH, /* BURST */
-  PERMIT_AUTH, /* MODIFY_MINPOLL */
-  PERMIT_AUTH, /* MODIFY_MAXPOLL */
-  PERMIT_AUTH, /* DUMP */
-  PERMIT_AUTH, /* MODIFY_MAXDELAY */
-  PERMIT_AUTH, /* MODIFY_MAXDELAYRATIO */
-  PERMIT_AUTH, /* MODIFY_MAXUPDATESKEW */
-  PERMIT_OPEN, /* LOGON */
-  PERMIT_AUTH, /* SETTIME */
-  PERMIT_AUTH, /* LOCAL */
-  PERMIT_AUTH, /* MANUAL */
-  PERMIT_OPEN, /* N_SOURCES */
-  PERMIT_OPEN, /* SOURCE_DATA */
-  PERMIT_AUTH, /* REKEY */
-  PERMIT_AUTH, /* ALLOW */
-  PERMIT_AUTH, /* ALLOWALL */
-  PERMIT_AUTH, /* DENY */
-  PERMIT_AUTH, /* DENYALL */
-  PERMIT_AUTH, /* CMDALLOW */
-  PERMIT_AUTH, /* CMDALLOWALL */
-  PERMIT_AUTH, /* CMDDENY */
-  PERMIT_AUTH, /* CMDDENYALL */
-  PERMIT_AUTH, /* ACCHECK */
-  PERMIT_AUTH, /* CMDACCHECK */
-  PERMIT_AUTH, /* ADD_SERVER */
-  PERMIT_AUTH, /* ADD_PEER */
-  PERMIT_AUTH, /* DEL_SOURCE */
-  PERMIT_AUTH, /* WRITERTC */
-  PERMIT_AUTH, /* DFREQ */
-  PERMIT_AUTH, /* DOFFSET */
-  PERMIT_OPEN, /* TRACKING */
-  PERMIT_OPEN, /* SOURCESTATS */
-  PERMIT_OPEN, /* RTCREPORT */
-  PERMIT_AUTH, /* TRIMRTC */
-  PERMIT_AUTH, /* CYCLELOGS */
-  PERMIT_AUTH, /* SUBNETS_ACCESSED */
-  PERMIT_AUTH, /* CLIENT_ACCESSES (by subnet) */
-  PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX */
-  PERMIT_OPEN, /* MANUAL_LIST */
-  PERMIT_AUTH, /* MANUAL_DELETE */
-  PERMIT_AUTH, /* MAKESTEP */
-  PERMIT_OPEN, /* ACTIVITY */
-  PERMIT_AUTH, /* MODIFY_MINSTRATUM */
-  PERMIT_AUTH, /* MODIFY_POLLTARGET */
-  PERMIT_AUTH, /* MODIFY_MAXDELAYDEVRATIO */
-  PERMIT_AUTH, /* RESELECT */
-  PERMIT_AUTH, /* RESELECTDISTANCE */
-  PERMIT_AUTH, /* MODIFY_MAKESTEP */
-  PERMIT_OPEN, /* SMOOTHING */
-  PERMIT_AUTH, /* SMOOTHTIME */
-  PERMIT_AUTH, /* REFRESH */
-  PERMIT_AUTH, /* SERVER_STATS */
-  PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX2 */
-  PERMIT_AUTH, /* LOCAL2 */
-  PERMIT_AUTH, /* NTP_DATA */
-  PERMIT_AUTH, /* ADD_SERVER2 */
-  PERMIT_AUTH, /* ADD_PEER2 */
-  PERMIT_AUTH, /* ADD_SERVER3 */
-  PERMIT_AUTH, /* ADD_PEER3 */
-  PERMIT_AUTH, /* SHUTDOWN */
-  PERMIT_AUTH, /* ONOFFLINE */
-  PERMIT_AUTH, /* ADD_SOURCE */
-  PERMIT_OPEN, /* NTP_SOURCE_NAME */
-  PERMIT_AUTH, /* RESET_SOURCES */
-  PERMIT_AUTH, /* AUTH_DATA */
-  PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX3 */
-  PERMIT_AUTH, /* SELECT_DATA */
-  PERMIT_AUTH, /* RELOAD_SOURCES */
-  PERMIT_AUTH, /* DOFFSET2 */
-  PERMIT_AUTH, /* MODIFY_SELECTOPTS */
-};
-
 /* ================================================== */
 
 /* This authorisation table is used for checking whether particular
@@ -225,19 +146,17 @@ do_size_checks(void)
     request.command = htons(i);
     request_length = PKL_CommandLength(&request);
     padding_length = PKL_CommandPaddingLength(&request);
-    if (padding_length > MAX_PADDING_LENGTH || padding_length > request_length ||
-        request_length > sizeof (CMD_Request) ||
-        (request_length && request_length < offsetof(CMD_Request, data)))
-      assert(0);
+    BRIEF_ASSERT(padding_length <= MAX_PADDING_LENGTH && padding_length <= request_length &&
+                 request_length <= sizeof (CMD_Request) &&
+                 (request_length == 0 || request_length >= offsetof(CMD_Request, data)));
   }
 
   for (i = 1; i < N_REPLY_TYPES; i++) {
     reply.reply = htons(i);
     reply.status = STT_SUCCESS;
     reply_length = PKL_ReplyLength(&reply);
-    if ((reply_length && reply_length < offsetof(CMD_Reply, data)) ||
-        reply_length > sizeof (CMD_Reply))
-      assert(0);
+    BRIEF_ASSERT((reply_length == 0 || reply_length >= offsetof(CMD_Reply, data)) &&
+                 reply_length <= sizeof (CMD_Reply));
   }
 }
 
@@ -247,7 +166,6 @@ void
 CAM_Initialise(void)
 {
   assert(!initialised);
-  assert(sizeof (permissions) / sizeof (permissions[0]) == N_REQUEST_TYPES);
   do_size_checks();
 
   initialised = 1;
@@ -530,7 +448,10 @@ handle_local(CMD_Request *rx_message, CMD_Reply *tx_message)
   if (ntohl(rx_message->data.local.on_off)) {
     REF_EnableLocal(ntohl(rx_message->data.local.stratum),
                     UTI_FloatNetworkToHost(rx_message->data.local.distance),
-                    ntohl(rx_message->data.local.orphan));
+                    ntohl(rx_message->data.local.orphan),
+                    UTI_FloatNetworkToHost(rx_message->data.local.activate),
+                    UTI_FloatNetworkToHost(rx_message->data.local.wait_synced),
+                    UTI_FloatNetworkToHost(rx_message->data.local.wait_unsynced));
   } else {
     REF_DisableLocal();
   }
@@ -720,9 +641,10 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
   NTP_Source_Type type;
   SourceParameters params;
+  int family, pool, port;
   NSR_Status status;
+  uint32_t flags;
   char *name;
-  int pool, port;
   
   switch (ntohl(rx_message->data.ntp_source.type)) {
     case REQ_ADDSRC_SERVER:
@@ -750,6 +672,10 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
       return;
   }
 
+  flags = ntohl(rx_message->data.ntp_source.flags);
+
+  family = flags & REQ_ADDSRC_IPV4 ? IPADDR_INET4 :
+           flags & REQ_ADDSRC_IPV6 ? IPADDR_INET6 : IPADDR_UNSPEC;
   port = ntohl(rx_message->data.ntp_source.port);
   params.minpoll = ntohl(rx_message->data.ntp_source.minpoll);
   params.maxpoll = ntohl(rx_message->data.ntp_source.maxpoll);
@@ -775,21 +701,19 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
   params.asymmetry = UTI_FloatNetworkToHost(rx_message->data.ntp_source.asymmetry);
   params.offset = UTI_FloatNetworkToHost(rx_message->data.ntp_source.offset);
 
-  params.connectivity = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_ONLINE ?
-                        SRC_ONLINE : SRC_OFFLINE;
-  params.auto_offline = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_AUTOOFFLINE ? 1 : 0;
-  params.iburst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_IBURST ? 1 : 0;
-  params.interleaved = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_INTERLEAVED ? 1 : 0;
-  params.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_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.connectivity = flags & REQ_ADDSRC_ONLINE ? SRC_ONLINE : SRC_OFFLINE;
+  params.auto_offline = !!(flags & REQ_ADDSRC_AUTOOFFLINE);
+  params.iburst = !!(flags & REQ_ADDSRC_IBURST);
+  params.interleaved = !!(flags & REQ_ADDSRC_INTERLEAVED);
+  params.burst = !!(flags & REQ_ADDSRC_BURST);
+  params.nts = !!(flags & REQ_ADDSRC_NTS);
+  params.copy = !!(flags & REQ_ADDSRC_COPY);
+  params.ext_fields = (flags & REQ_ADDSRC_EF_EXP_MONO_ROOT ? NTP_EF_FLAG_EXP_MONO_ROOT : 0) |
+                      (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);
+  status = NSR_AddSourceByName(name, family, port, pool, type, &params, NULL);
   switch (status) {
     case NSR_Success:
       break;
@@ -807,6 +731,8 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
       tx_message->status = htons(STT_INVALIDNAME);
       break;
     case NSR_InvalidAF:
+      tx_message->status = htons(STT_INVALIDAF);
+      break;
     case NSR_NoSuchSource:
       assert(0);
       break;
@@ -1225,7 +1151,7 @@ handle_ntp_data(CMD_Request *rx_message, CMD_Reply *tx_message)
     return;
   }
 
-  tx_message->reply = htons(RPY_NTP_DATA);
+  tx_message->reply = htons(RPY_NTP_DATA2);
   UTI_IPHostToNetwork(&report.remote_addr, &tx_message->data.ntp_data.remote_addr);
   UTI_IPHostToNetwork(&report.local_addr, &tx_message->data.ntp_data.local_addr);
   tx_message->data.ntp_data.remote_port = htons(report.remote_port);
@@ -1253,6 +1179,10 @@ handle_ntp_data(CMD_Request *rx_message, CMD_Reply *tx_message)
   tx_message->data.ntp_data.total_rx_count = htonl(report.total_rx_count);
   tx_message->data.ntp_data.total_valid_count = htonl(report.total_valid_count);
   tx_message->data.ntp_data.total_good_count = htonl(report.total_good_count);
+  tx_message->data.ntp_data.total_kernel_tx_ts = htonl(report.total_kernel_tx_ts);
+  tx_message->data.ntp_data.total_kernel_rx_ts = htonl(report.total_kernel_rx_ts);
+  tx_message->data.ntp_data.total_hw_tx_ts = htonl(report.total_hw_tx_ts);
+  tx_message->data.ntp_data.total_hw_rx_ts = htonl(report.total_hw_rx_ts);
   memset(tx_message->data.ntp_data.reserved, 0xff, sizeof (tx_message->data.ntp_data.reserved));
 }
 
@@ -1409,18 +1339,260 @@ handle_modify_selectopts(CMD_Request *rx_message, CMD_Reply *tx_message)
     tx_message->status = htons(STT_NOSUCHSOURCE);
 }
 
+/* ================================================== */
+
+static void
+handle_modify_offset(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  uint32_t ref_id;
+  IPAddr ip_addr;
+  double offset;
+
+  UTI_IPNetworkToHost(&rx_message->data.modify_offset.address, &ip_addr);
+  ref_id = ntohl(rx_message->data.modify_offset.ref_id);
+  offset = UTI_FloatNetworkToHost(rx_message->data.modify_offset.new_offset);
+
+  if ((ip_addr.family != IPADDR_UNSPEC && !NSR_ModifyOffset(&ip_addr, offset)) ||
+      (ip_addr.family == IPADDR_UNSPEC && !RCL_ModifyOffset(ref_id, offset)))
+    tx_message->status = htons(STT_NOSUCHSOURCE);
+}
+
+/* ================================================== */
+
+static int
+handle_readwrite_commands(int command, CMD_Request *request, CMD_Reply *reply)
+{
+  switch (command) {
+    case REQ_ADD_SOURCE:
+      handle_add_source(request, reply);
+      break;
+    case REQ_ALLOW:
+      handle_allowdeny(request, reply, 1, 0);
+      break;
+    case REQ_ALLOWALL:
+      handle_allowdeny(request, reply, 1, 1);
+      break;
+    case REQ_BURST:
+      handle_burst(request, reply);
+      break;
+    case REQ_CMDALLOW:
+      handle_cmdallowdeny(request, reply, 1, 0);
+      break;
+    case REQ_CMDALLOWALL:
+      handle_cmdallowdeny(request, reply, 1, 1);
+      break;
+    case REQ_CMDDENY:
+      handle_cmdallowdeny(request, reply, 0, 0);
+      break;
+    case REQ_CMDDENYALL:
+      handle_cmdallowdeny(request, reply, 0, 1);
+      break;
+    case REQ_CYCLELOGS:
+      handle_cyclelogs(request, reply);
+      break;
+    case REQ_DEL_SOURCE:
+      handle_del_source(request, reply);
+      break;
+    case REQ_DENY:
+      handle_allowdeny(request, reply, 0, 0);
+      break;
+    case REQ_DENYALL:
+      handle_allowdeny(request, reply, 0, 1);
+      break;
+    case REQ_DFREQ:
+      handle_dfreq(request, reply);
+      break;
+    case REQ_DOFFSET2:
+      handle_doffset(request, reply);
+      break;
+    case REQ_DUMP:
+      handle_dump(request, reply);
+      break;
+    case REQ_LOCAL3:
+      handle_local(request, reply);
+      break;
+    case REQ_MAKESTEP:
+      handle_make_step(request, reply);
+      break;
+    case REQ_MANUAL:
+      handle_manual(request, reply);
+      break;
+    case REQ_MANUAL_DELETE:
+      handle_manual_delete(request, reply);
+      break;
+    case REQ_MODIFY_MAKESTEP:
+      handle_modify_makestep(request, reply);
+      break;
+    case REQ_MODIFY_MAXDELAY:
+      handle_modify_maxdelay(request, reply);
+      break;
+    case REQ_MODIFY_MAXDELAYDEVRATIO:
+      handle_modify_maxdelaydevratio(request, reply);
+      break;
+    case REQ_MODIFY_MAXDELAYRATIO:
+      handle_modify_maxdelayratio(request, reply);
+      break;
+    case REQ_MODIFY_MAXPOLL:
+      handle_modify_maxpoll(request, reply);
+      break;
+    case REQ_MODIFY_MAXUPDATESKEW:
+      handle_modify_maxupdateskew(request, reply);
+      break;
+    case REQ_MODIFY_MINPOLL:
+      handle_modify_minpoll(request, reply);
+      break;
+    case REQ_MODIFY_MINSTRATUM:
+      handle_modify_minstratum(request, reply);
+      break;
+    case REQ_MODIFY_OFFSET:
+      handle_modify_offset(request, reply);
+      break;
+    case REQ_MODIFY_POLLTARGET:
+      handle_modify_polltarget(request, reply);
+      break;
+    case REQ_MODIFY_SELECTOPTS:
+      handle_modify_selectopts(request, reply);
+      break;
+    case REQ_OFFLINE:
+      handle_offline(request, reply);
+      break;
+    case REQ_ONLINE:
+      handle_online(request, reply);
+      break;
+    case REQ_ONOFFLINE:
+      handle_onoffline(request, reply);
+      break;
+    case REQ_REFRESH:
+      handle_refresh(request, reply);
+      break;
+    case REQ_REKEY:
+      handle_rekey(request, reply);
+      break;
+    case REQ_RELOAD_SOURCES:
+      handle_reload_sources(request, reply);
+      break;
+    case REQ_RESELECT:
+      handle_reselect(request, reply);
+      break;
+    case REQ_RESELECTDISTANCE:
+      handle_reselect_distance(request, reply);
+      break;
+    case REQ_RESET_SOURCES:
+      handle_reset_sources(request, reply);
+      break;
+    case REQ_SETTIME:
+      handle_settime(request, reply);
+      break;
+    case REQ_SHUTDOWN:
+      handle_shutdown(request, reply);
+      break;
+    case REQ_SMOOTHTIME:
+      handle_smoothtime(request, reply);
+      break;
+    case REQ_TRIMRTC:
+      handle_trimrtc(request, reply);
+      break;
+    case REQ_WRITERTC:
+      handle_writertc(request, reply);
+      break;
+    default:
+      return 0;
+  }
+
+  return 1;
+}
+
+/* ================================================== */
+
+static int
+handle_readonly_commands(int command, int full_access, CMD_Request *request, CMD_Reply *reply)
+{
+  ARR_Instance open_commands;
+  int i, allowed = 0;
+
+  if (full_access) {
+    allowed = 1;
+  } else {
+    open_commands = CNF_GetOpenCommands();
+
+    for (i = 0; i < ARR_GetSize(open_commands); i++) {
+      if (*(int *)ARR_GetElement(open_commands, i) == command) {
+        allowed = 1;
+        break;
+      }
+    }
+  }
+
+  if (!allowed)
+    return 0;
+
+  switch (command) {
+    case REQ_ACCHECK:
+      handle_accheck(request, reply);
+      break;
+    case REQ_ACTIVITY:
+      handle_activity(request, reply);
+      break;
+    case REQ_AUTH_DATA:
+      handle_auth_data(request, reply);
+      break;
+    case REQ_CLIENT_ACCESSES_BY_INDEX3:
+      handle_client_accesses_by_index(request, reply);
+      break;
+    case REQ_CMDACCHECK:
+      handle_cmdaccheck(request, reply);
+      break;
+    case REQ_MANUAL_LIST:
+      handle_manual_list(request, reply);
+      break;
+    case REQ_NTP_DATA:
+      handle_ntp_data(request, reply);
+      break;
+    case REQ_NTP_SOURCE_NAME:
+      handle_ntp_source_name(request, reply);
+      break;
+    case REQ_N_SOURCES:
+      handle_n_sources(request, reply);
+      break;
+    case REQ_RTCREPORT:
+      handle_rtcreport(request, reply);
+      break;
+    case REQ_SELECT_DATA:
+      handle_select_data(request, reply);
+      break;
+    case REQ_SERVER_STATS:
+      handle_server_stats(request, reply);
+      break;
+    case REQ_SMOOTHING:
+      handle_smoothing(request, reply);
+      break;
+    case REQ_SOURCESTATS:
+      handle_sourcestats(request, reply);
+      break;
+    case REQ_SOURCE_DATA:
+      handle_source_data(request, reply);
+      break;
+    case REQ_TRACKING:
+      handle_tracking(request, reply);
+      break;
+    default:
+      return 0;
+  }
+
+  return 1;
+}
+
 /* ================================================== */
 /* Read a packet and process it */
 
 static void
 read_from_cmd_socket(int sock_fd, int event, void *anything)
 {
+  int read_length, expected_length, localhost, log_index, full_access, handled;
   SCK_Message *sck_message;
   CMD_Request rx_message;
   CMD_Reply tx_message;
   IPAddr loopback_addr, remote_ip;
-  int read_length, expected_length;
-  int localhost, allowed, log_index;
   uint16_t rx_command;
   struct timespec now, cooked_now;
 
@@ -1433,32 +1605,27 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
   /* Get current time cheaply */
   SCH_GetLastEventTime(&cooked_now, NULL, &now);
 
-  /* Check if it's from localhost (127.0.0.1, ::1, or Unix domain),
-     or an authorised address */
-  switch (sck_message->addr_type) {
-    case SCK_ADDR_IP:
-      assert(sock_fd == sock_fd4 || sock_fd == sock_fd6);
-      remote_ip = sck_message->remote_addr.ip.ip_addr;
-      SCK_GetLoopbackIPAddress(remote_ip.family, &loopback_addr);
-      localhost = UTI_CompareIPs(&remote_ip, &loopback_addr, NULL) == 0;
+  /* Check if the request came from the Unix domain socket, or network and
+     whether the address is allowed (127.0.0.1 and ::1 is always allowed) */
+  if ((sock_fd == sock_fd4 || sock_fd == sock_fd6) && sck_message->addr_type == SCK_ADDR_IP) {
+    remote_ip = sck_message->remote_addr.ip.ip_addr;
+    SCK_GetLoopbackIPAddress(remote_ip.family, &loopback_addr);
+    localhost = UTI_CompareIPs(&remote_ip, &loopback_addr, NULL) == 0;
 
-      if (!localhost && !ADF_IsAllowed(access_auth_table, &remote_ip)) {
-        DEBUG_LOG("Unauthorised host %s",
-                  UTI_IPSockAddrToString(&sck_message->remote_addr.ip));
-        return;
-      }
-
-      assert(remote_ip.family != IPADDR_UNSPEC);
-
-      break;
-    case SCK_ADDR_UNIX:
-      assert(sock_fd == sock_fdu);
-      remote_ip.family = IPADDR_UNSPEC;
-      localhost = 1;
-      break;
-    default:
-      DEBUG_LOG("Unexpected address type");
+    if (!localhost && !ADF_IsAllowed(access_auth_table, &remote_ip)) {
+      DEBUG_LOG("Unauthorised host %s",
+                UTI_IPSockAddrToString(&sck_message->remote_addr.ip));
       return;
+    }
+
+    full_access = 0;
+  } else if (sock_fd == sock_fdu && sck_message->addr_type == SCK_ADDR_UNIX) {
+    remote_ip.family = IPADDR_UNSPEC;
+    localhost = 1;
+    full_access = 1;
+  } else {
+    DEBUG_LOG("Unexpected socket/address");
+    return;
   }
 
   if (read_length < offsetof(CMD_Request, data) ||
@@ -1483,9 +1650,10 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
 
   /* Don't reply to all requests from hosts other than localhost if the rate
      is excessive */
-  if (!localhost && log_index >= 0 && CLG_LimitServiceRate(CLG_CMDMON, log_index)) {
-      DEBUG_LOG("Command packet discarded to limit response rate");
-      return;
+  if (!localhost && log_index >= 0 &&
+      CLG_LimitServiceRate(CLG_CMDMON, log_index) != CLG_PASS) {
+    DEBUG_LOG("Command packet discarded to limit response rate");
+    return;
   }
 
   expected_length = PKL_CommandLength(&rx_message);
@@ -1533,293 +1701,20 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
 
   /* OK, we have a valid message.  Now dispatch on message type and process it. */
 
-  if (rx_command >= N_REQUEST_TYPES) {
-    /* This should be already handled */
-    assert(0);
-  } else {
-    /* Check level of authority required to issue the command.  All commands
-       from the Unix domain socket (which is accessible only by the root and
-       chrony user/group) are allowed. */
-    if (remote_ip.family == IPADDR_UNSPEC) {
-      assert(sock_fd == sock_fdu);
-      allowed = 1;
-    } else {
-      switch (permissions[rx_command]) {
-        case PERMIT_AUTH:
-          allowed = 0;
-          break;
-        case PERMIT_LOCAL:
-          allowed = localhost;
-          break;
-        case PERMIT_OPEN:
-          allowed = 1;
-          break;
-        default:
-          assert(0);
-          allowed = 0;
-      }
-    }
+  LOG_SetContext(LOGC_Command);
 
-    if (allowed) {
-      LOG_SetContext(LOGC_Command);
+  if (full_access)
+    handled = handle_readwrite_commands(rx_command, &rx_message, &tx_message);
+  else
+    handled = 0;
 
-      switch(rx_command) {
-        case REQ_NULL:
-          /* Do nothing */
-          break;
+  if (!handled)
+    handled = handle_readonly_commands(rx_command, full_access, &rx_message, &tx_message);
 
-        case REQ_DUMP:
-          handle_dump(&rx_message, &tx_message);
-          break;
+  if (!handled)
+    tx_message.status = htons(STT_UNAUTH);
 
-        case REQ_ONLINE:
-          handle_online(&rx_message, &tx_message);
-          break;
-
-        case REQ_OFFLINE:
-          handle_offline(&rx_message, &tx_message);
-          break;
-
-        case REQ_BURST:
-          handle_burst(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MINPOLL:
-          handle_modify_minpoll(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAXPOLL:
-          handle_modify_maxpoll(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAXDELAY:
-          handle_modify_maxdelay(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAXDELAYRATIO:
-          handle_modify_maxdelayratio(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAXDELAYDEVRATIO:
-          handle_modify_maxdelaydevratio(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAXUPDATESKEW:
-          handle_modify_maxupdateskew(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MAKESTEP:
-          handle_modify_makestep(&rx_message, &tx_message);
-          break;
-
-        case REQ_LOGON:
-          /* Authentication is no longer supported, log-on always fails */
-          tx_message.status = htons(STT_FAILED);
-          break;
-
-        case REQ_SETTIME:
-          handle_settime(&rx_message, &tx_message);
-          break;
-        
-        case REQ_LOCAL2:
-          handle_local(&rx_message, &tx_message);
-          break;
-
-        case REQ_MANUAL:
-          handle_manual(&rx_message, &tx_message);
-          break;
-
-        case REQ_N_SOURCES:
-          handle_n_sources(&rx_message, &tx_message);
-          break;
-
-        case REQ_SOURCE_DATA:
-          handle_source_data(&rx_message, &tx_message);
-          break;
-
-        case REQ_REKEY:
-          handle_rekey(&rx_message, &tx_message);
-          break;
-
-        case REQ_ALLOW:
-          handle_allowdeny(&rx_message, &tx_message, 1, 0);
-          break;
-
-        case REQ_ALLOWALL:
-          handle_allowdeny(&rx_message, &tx_message, 1, 1);
-          break;
-
-        case REQ_DENY:
-          handle_allowdeny(&rx_message, &tx_message, 0, 0);
-          break;
-
-        case REQ_DENYALL:
-          handle_allowdeny(&rx_message, &tx_message, 0, 1);
-          break;
-
-        case REQ_CMDALLOW:
-          handle_cmdallowdeny(&rx_message, &tx_message, 1, 0);
-          break;
-
-        case REQ_CMDALLOWALL:
-          handle_cmdallowdeny(&rx_message, &tx_message, 1, 1);
-          break;
-
-        case REQ_CMDDENY:
-          handle_cmdallowdeny(&rx_message, &tx_message, 0, 0);
-          break;
-
-        case REQ_CMDDENYALL:
-          handle_cmdallowdeny(&rx_message, &tx_message, 0, 1);
-          break;
-
-        case REQ_ACCHECK:
-          handle_accheck(&rx_message, &tx_message);
-          break;
-
-        case REQ_CMDACCHECK:
-          handle_cmdaccheck(&rx_message, &tx_message);
-          break;
-
-        case REQ_ADD_SOURCE:
-          handle_add_source(&rx_message, &tx_message);
-          break;
-
-        case REQ_DEL_SOURCE:
-          handle_del_source(&rx_message, &tx_message);
-          break;
-
-        case REQ_WRITERTC:
-          handle_writertc(&rx_message, &tx_message);
-          break;
-          
-        case REQ_DFREQ:
-          handle_dfreq(&rx_message, &tx_message);
-          break;
-
-        case REQ_DOFFSET2:
-          handle_doffset(&rx_message, &tx_message);
-          break;
-
-        case REQ_TRACKING:
-          handle_tracking(&rx_message, &tx_message);
-          break;
-
-        case REQ_SMOOTHING:
-          handle_smoothing(&rx_message, &tx_message);
-          break;
-
-        case REQ_SMOOTHTIME:
-          handle_smoothtime(&rx_message, &tx_message);
-          break;
-
-        case REQ_SOURCESTATS:
-          handle_sourcestats(&rx_message, &tx_message);
-          break;
-
-        case REQ_RTCREPORT:
-          handle_rtcreport(&rx_message, &tx_message);
-          break;
-          
-        case REQ_TRIMRTC:
-          handle_trimrtc(&rx_message, &tx_message);
-          break;
-
-        case REQ_CYCLELOGS:
-          handle_cyclelogs(&rx_message, &tx_message);
-          break;
-
-        case REQ_CLIENT_ACCESSES_BY_INDEX3:
-          handle_client_accesses_by_index(&rx_message, &tx_message);
-          break;
-
-        case REQ_MANUAL_LIST:
-          handle_manual_list(&rx_message, &tx_message);
-          break;
-
-        case REQ_MANUAL_DELETE:
-          handle_manual_delete(&rx_message, &tx_message);
-          break;
-
-        case REQ_MAKESTEP:
-          handle_make_step(&rx_message, &tx_message);
-          break;
-
-        case REQ_ACTIVITY:
-          handle_activity(&rx_message, &tx_message);
-          break;
-
-        case REQ_RESELECTDISTANCE:
-          handle_reselect_distance(&rx_message, &tx_message);
-          break;
-
-        case REQ_RESELECT:
-          handle_reselect(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_MINSTRATUM:
-          handle_modify_minstratum(&rx_message, &tx_message);
-          break;
-
-        case REQ_MODIFY_POLLTARGET:
-          handle_modify_polltarget(&rx_message, &tx_message);
-          break;
-
-        case REQ_REFRESH:
-          handle_refresh(&rx_message, &tx_message);
-          break;
-
-        case REQ_SERVER_STATS:
-          handle_server_stats(&rx_message, &tx_message);
-          break;
-
-        case REQ_NTP_DATA:
-          handle_ntp_data(&rx_message, &tx_message);
-          break;
-
-        case REQ_SHUTDOWN:
-          handle_shutdown(&rx_message, &tx_message);
-          break;
-
-        case REQ_ONOFFLINE:
-          handle_onoffline(&rx_message, &tx_message);
-          break;
-
-        case REQ_NTP_SOURCE_NAME:
-          handle_ntp_source_name(&rx_message, &tx_message);
-          break;
-
-        case REQ_RESET_SOURCES:
-          handle_reset_sources(&rx_message, &tx_message);
-          break;
-
-        case REQ_AUTH_DATA:
-          handle_auth_data(&rx_message, &tx_message);
-          break;
-
-        case REQ_SELECT_DATA:
-          handle_select_data(&rx_message, &tx_message);
-          break;
-
-        case REQ_RELOAD_SOURCES:
-          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);
-    }
-  }
+  LOG_UnsetContext(LOGC_Command);
 
   /* Transmit the response */
   transmit_reply(sock_fd, read_length, sck_message);

cmdparse.c

@@ -39,13 +39,19 @@
 
 /* ================================================== */
 
-int
+#define SSCANF_IN_RANGE(s, f, x, n, min, max) \
+  (sscanf((s), (f), (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
+
+/* ================================================== */
+
+CPS_Status
 CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
 {
   char *hostname, *cmd;
   uint32_t ef_type;
   int n, sel_option;
   
+  src->family = IPADDR_UNSPEC;
   src->port = SRC_DEFAULT_PORT;
   src->params.minpoll = SRC_DEFAULT_MINPOLL;
   src->params.maxpoll = SRC_DEFAULT_MAXPOLL;
@@ -81,7 +87,7 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
   line = CPS_SplitWord(line);
 
   if (!*hostname)
-    return 0;
+    return CPS_MissingArgument;
 
   src->name = hostname;
 
@@ -103,17 +109,17 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
       src->params.connectivity = SRC_OFFLINE;
     } else if (!strcasecmp(cmd, "certset")) {
       if (sscanf(line, "%"SCNu32"%n", &src->params.cert_set, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "key")) {
       if (sscanf(line, "%"SCNu32"%n", &src->params.authkey, &n) != 1 ||
           src->params.authkey == INACTIVE_AUTHKEY)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "asymmetry")) {
       if (sscanf(line, "%lf%n", &src->params.asymmetry, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "extfield")) {
       if (sscanf(line, "%"SCNx32"%n", &ef_type, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
       switch (ef_type) {
         case NTP_EF_EXP_MONO_ROOT:
           src->params.ext_fields |= NTP_EF_FLAG_EXP_MONO_ROOT;
@@ -122,74 +128,78 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
           src->params.ext_fields |= NTP_EF_FLAG_EXP_NET_CORRECTION;
           break;
         default:
-          return 0;
+          return CPS_InvalidValue;
       }
     } else if (!strcasecmp(cmd, "filter")) {
-      if (sscanf(line, "%d%n", &src->params.filter_length, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.filter_length, &n, 0, INT_MAX))
+        return CPS_InvalidValue;
+    } else if (!strcasecmp(cmd, "ipv4")) {
+      src->family = IPADDR_INET4;
+    } else if (!strcasecmp(cmd, "ipv6")) {
+      src->family = IPADDR_INET6;
     } else if (!strcasecmp(cmd, "maxdelay")) {
       if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxdelayratio")) {
       if (sscanf(line, "%lf%n", &src->params.max_delay_ratio, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxdelaydevratio")) {
       if (sscanf(line, "%lf%n", &src->params.max_delay_dev_ratio, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxdelayquant")) {
       if (sscanf(line, "%lf%n", &src->params.max_delay_quant, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxpoll")) {
-      if (sscanf(line, "%d%n", &src->params.maxpoll, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.maxpoll, &n, -32, 32))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxsamples")) {
-      if (sscanf(line, "%d%n", &src->params.max_samples, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.max_samples, &n, 0, INT_MAX))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "maxsources")) {
-      if (sscanf(line, "%d%n", &src->params.max_sources, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.max_sources, &n, 1, INT_MAX))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "mindelay")) {
       if (sscanf(line, "%lf%n", &src->params.min_delay, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "minpoll")) {
       if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "minsamples")) {
-      if (sscanf(line, "%d%n", &src->params.min_samples, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.min_samples, &n, 0, INT_MAX))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "minstratum")) {
-      if (sscanf(line, "%d%n", &src->params.min_stratum, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.min_stratum, &n, 0, NTP_MAX_STRATUM))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "nts")) {
       src->params.nts = 1;
     } else if (!strcasecmp(cmd, "ntsport")) {
-      if (sscanf(line, "%d%n", &src->params.nts_port, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.nts_port, &n, 0, 65535))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "offset")) {
       if (sscanf(line, "%lf%n", &src->params.offset, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "port")) {
-      if (sscanf(line, "%d%n", &src->port, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->port, &n, 0, 65535))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "polltarget")) {
-      if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.poll_target, &n, 1, INT_MAX))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "presend")) {
-      if (sscanf(line, "%d%n", &src->params.presend_minpoll, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.presend_minpoll, &n, -32, 32))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "version")) {
-      if (sscanf(line, "%d%n", &src->params.version, &n) != 1)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.version, &n, 1, NTP_VERSION))
+        return CPS_InvalidValue;
     } 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;
+      return CPS_InvalidOption;
     }
   }
 
-  return 1;
+  return CPS_Success;
 }
 
 /* ================================================== */
@@ -290,38 +300,53 @@ CPS_ParseAllowDeny(char *line, int *all, IPAddr *ip, int *subnet_bits)
 
 /* ================================================== */
 
-int
-CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance)
+CPS_Status
+CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance, double *activate,
+               double *wait_synced, double *wait_unsynced)
 {
   int n;
   char *cmd;
 
   *stratum = 10;
   *distance = 1.0;
+  *activate = 0.0;
   *orphan = 0;
+  *wait_synced = 0;
+  *wait_unsynced = -1.0;
 
   while (*line) {
     cmd = line;
     line = CPS_SplitWord(line);
 
     if (!strcasecmp(cmd, "stratum")) {
-      if (sscanf(line, "%d%n", stratum, &n) != 1 ||
-          *stratum >= NTP_MAX_STRATUM || *stratum <= 0)
-        return 0;
+      if (!SSCANF_IN_RANGE(line, "%d%n", stratum, &n, 1, NTP_MAX_STRATUM - 1))
+        return CPS_InvalidValue;
     } else if (!strcasecmp(cmd, "orphan")) {
       *orphan = 1;
       n = 0;
     } else if (!strcasecmp(cmd, "distance")) {
       if (sscanf(line, "%lf%n", distance, &n) != 1)
-        return 0;
+        return CPS_InvalidValue;
+    } else if (!strcasecmp(cmd, "activate")) {
+      if (sscanf(line, "%lf%n", activate, &n) != 1)
+        return CPS_InvalidValue;
+    } else if (!strcasecmp(cmd, "waitsynced")) {
+      if (sscanf(line, "%lf%n", wait_synced, &n) != 1)
+        return CPS_InvalidValue;
+    } else if (!strcasecmp(cmd, "waitunsynced")) {
+      if (sscanf(line, "%lf%n", wait_unsynced, &n) != 1)
+        return CPS_InvalidValue;
     } else {
-      return 0;
+      return CPS_InvalidOption;
     }
 
     line += n;
   }
 
-  return 1;
+  if (*wait_unsynced < 0.0)
+    *wait_unsynced = *orphan ? 300 : 0.0;
+
+  return CPS_Success;
 }
 
 /* ================================================== */

cmdparse.h

@@ -30,14 +30,22 @@
 #include "srcparams.h"
 #include "addressing.h"
 
+typedef enum {
+  CPS_Success,
+  CPS_InvalidValue,
+  CPS_InvalidOption,
+  CPS_MissingArgument,
+} CPS_Status;
+
 typedef struct {
   char *name;
+  int family;
   int port;
   SourceParameters params;
 } CPS_NTP_Source;
 
 /* Parse a command to add an NTP server or peer */
-extern int CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
+extern CPS_Status CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src);
   
 /* Get an NTP/refclock select option */
 extern int CPS_GetSelectOption(char *option);
@@ -46,7 +54,8 @@ extern int CPS_GetSelectOption(char *option);
 extern int CPS_ParseAllowDeny(char *line, int *all, IPAddr *ip, int *subnet_bits);
 
 /* Parse a command to enable local reference */
-extern int CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance);
+extern CPS_Status CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance,
+                                 double *activate, double *wait_synced, double *wait_unsynced);
 
 /* Remove extra white-space and comments */
 extern void CPS_NormalizeLine(char *line);

conf.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2017, 2020
+ * Copyright (C) Miroslav Lichvar  2009-2017, 2020, 2024
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -50,13 +50,17 @@
 #define MAX_CONF_DIRS 10
 #define MAX_INCLUDE_LEVEL 10
 
+#define SSCANF_IN_RANGE(s, f, x, n, min, max) \
+  (sscanf((s), (f), (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
+
 /* ================================================== */
 /* Forward prototypes */
 
-static int parse_string(char *line, char **result);
-static int parse_int(char *line, int *result);
-static int parse_double(char *line, double *result);
-static int parse_null(char *line);
+static void parse_string(char *line, char **result);
+static void parse_int(char *line, int *result, int min, int max);
+static void parse_double(char *line, double *result);
+static void parse_null(char *line, int *result);
+static void parse_ints(char *line, ARR_Instance array, int min, int max);
 
 static void parse_allow_deny(char *line, ARR_Instance restrictions, int allow);
 static void parse_authselectmode(char *);
@@ -66,6 +70,7 @@ static void parse_bindcmdaddress(char *);
 static void parse_broadcast(char *);
 static void parse_clientloglimit(char *);
 static void parse_confdir(char *);
+static void parse_driftfile(char *);
 static void parse_fallbackdrift(char *);
 static void parse_hwtimestamp(char *);
 static void parse_include(char *);
@@ -78,8 +83,10 @@ static void parse_makestep(char *);
 static void parse_maxchange(char *);
 static void parse_ntsserver(char *, ARR_Instance files);
 static void parse_ntstrustedcerts(char *);
+static void parse_open_commands(char *line);
+static void parse_pidfile(char *line);
 static void parse_ratelimit(char *line, int *enabled, int *interval,
-                            int *burst, int *leak);
+                            int *burst, int *leak, int *kod);
 static void parse_refclock(char *);
 static void parse_smoothtime(char *);
 static void parse_source(char *line, char *type, int fatal);
@@ -96,6 +103,7 @@ static int acquisition_port = -1;
 static int ntp_port = NTP_PORT;
 static char *keys_file = NULL;
 static char *drift_file = NULL;
+static int drift_file_interval = 3600;
 static char *rtc_file = NULL;
 static double max_update_skew = 1000.0;
 static double correction_time_ratio = 3.0;
@@ -129,6 +137,9 @@ static int enable_local=0;
 static int local_stratum;
 static int local_orphan;
 static double local_distance;
+static double local_activate;
+static double local_wait_synced;
+static double local_wait_unsynced;
 
 /* Threshold (in seconds) - if absolute value of initial error is less
    than this, slew instead of stepping */
@@ -220,6 +231,7 @@ static int ntp_ratelimit_enabled = 0;
 static int ntp_ratelimit_interval = 3;
 static int ntp_ratelimit_burst = 8;
 static int ntp_ratelimit_leak = 2;
+static int ntp_ratelimit_kod = 0;
 static int nts_ratelimit_enabled = 0;
 static int nts_ratelimit_interval = 6;
 static int nts_ratelimit_burst = 8;
@@ -249,13 +261,19 @@ static REF_LeapMode leapsec_mode = REF_LeapModeSystem;
 /* Name of a system timezone containing leap seconds occuring at midnight */
 static char *leapsec_tz = NULL;
 
+/* File name of leap seconds list, usually /usr/share/zoneinfo/leap-seconds.list */
+static char *leapsec_list = NULL;
+
 /* Name of the user to which will be dropped root privileges. */
 static char *user;
 
 /* Address refresh interval */
 static int refresh = 1209600; /* 2 weeks */
 
+#define DEFAULT_NTS_AEADS "30 15"
+
 /* NTS server and client configuration */
+static ARR_Instance nts_aeads; /* array of int */
 static char *nts_dump_dir = NULL;
 static char *nts_ntp_server = NULL;
 static ARR_Instance nts_server_cert_files; /* array of (char *) */
@@ -282,19 +300,23 @@ static double hwts_timeout = 0.001;
 
 /* PTP event port (disabled by default) */
 static int ptp_port = 0;
+/* PTP domain number of NTP-over-PTP messages */
+static int ptp_domain = 123;
 
 typedef struct {
   NTP_Source_Type type;
   int pool;
   CPS_NTP_Source params;
+  NSR_Status status;
+  uint32_t conf_id;
 } NTP_Source;
 
 /* Array of NTP_Source */
 static ARR_Instance ntp_sources;
 /* Array of (char *) */
 static ARR_Instance ntp_source_dirs;
-/* Array of uint32_t corresponding to ntp_sources (for sourcedirs reload) */
-static ARR_Instance ntp_source_ids;
+/* Flag indicating ntp_sources is used for sourcedirs after config load */
+static int conf_ntp_sources_added = 0;
 
 /* Array of RefclockParameters */
 static ARR_Instance refclock_sources;
@@ -310,6 +332,11 @@ typedef struct _AllowDeny {
 static ARR_Instance ntp_restrictions;
 static ARR_Instance cmd_restrictions;
 
+#define DEFAULT_OPEN_COMMANDS "activity manual rtcdata smoothing sourcename sources sourcestats tracking"
+
+/* Array of int specifying commands allowed from network */
+static ARR_Instance open_commands;
+
 typedef struct {
   NTP_Remote_Address addr;
   int interval;
@@ -339,12 +366,20 @@ command_parse_error(void)
 
 /* ================================================== */
 
+FORMAT_ATTRIBUTE_PRINTF(1, 2)
 static void
-other_parse_error(const char *message)
+other_parse_error(const char *format, ...)
 {
-    LOG_FATAL("%s at line %d%s%s",
-        message, line_number, processed_file ? " in file " : "",
-        processed_file ? processed_file : "");
+  char buf[256];
+  va_list ap;
+
+  va_start(ap, format);
+  vsnprintf(buf, sizeof (buf), format, ap);
+  va_end(ap);
+
+  LOG_FATAL("%s at line %d%s%s",
+            buf, line_number, processed_file ? " in file " : "",
+            processed_file ? processed_file : "");
 }
 
 /* ================================================== */
@@ -387,6 +422,8 @@ check_number_of_args(char *line, int num)
 void
 CNF_Initialise(int r, int client_only)
 {
+  char buf[128];
+
   restarted = r;
 
   hwts_interfaces = ARR_CreateInstance(sizeof (CNF_HwTsInterface));
@@ -394,13 +431,19 @@ CNF_Initialise(int r, int client_only)
   init_sources = ARR_CreateInstance(sizeof (IPAddr));
   ntp_sources = ARR_CreateInstance(sizeof (NTP_Source));
   ntp_source_dirs = ARR_CreateInstance(sizeof (char *));
-  ntp_source_ids = ARR_CreateInstance(sizeof (uint32_t));
   refclock_sources = ARR_CreateInstance(sizeof (RefclockParameters));
   broadcasts = ARR_CreateInstance(sizeof (NTP_Broadcast_Destination));
 
   ntp_restrictions = ARR_CreateInstance(sizeof (AllowDeny));
   cmd_restrictions = ARR_CreateInstance(sizeof (AllowDeny));
 
+  open_commands = ARR_CreateInstance(sizeof (int));
+  snprintf(buf, sizeof (buf), DEFAULT_OPEN_COMMANDS);
+  parse_open_commands(buf);
+
+  nts_aeads = ARR_CreateInstance(sizeof (int));
+  snprintf(buf, sizeof (buf), DEFAULT_NTS_AEADS);
+  parse_ints(buf, nts_aeads, 0, INT_MAX);
   nts_server_cert_files = ARR_CreateInstance(sizeof (char *));
   nts_server_key_files = ARR_CreateInstance(sizeof (char *));
   nts_trusted_certs_paths = ARR_CreateInstance(sizeof (char *));
@@ -454,13 +497,15 @@ CNF_Finalise(void)
   ARR_DestroyInstance(init_sources);
   ARR_DestroyInstance(ntp_sources);
   ARR_DestroyInstance(ntp_source_dirs);
-  ARR_DestroyInstance(ntp_source_ids);
   ARR_DestroyInstance(refclock_sources);
   ARR_DestroyInstance(broadcasts);
 
+  ARR_DestroyInstance(open_commands);
+
   ARR_DestroyInstance(ntp_restrictions);
   ARR_DestroyInstance(cmd_restrictions);
 
+  ARR_DestroyInstance(nts_aeads);
   ARR_DestroyInstance(nts_server_cert_files);
   ARR_DestroyInstance(nts_server_key_files);
   ARR_DestroyInstance(nts_trusted_certs_paths);
@@ -471,6 +516,7 @@ CNF_Finalise(void)
   Free(hwclock_file);
   Free(keys_file);
   Free(leapsec_tz);
+  Free(leapsec_list);
   Free(logdir);
   Free(bind_ntp_iface);
   Free(bind_acq_iface);
@@ -554,7 +600,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
     printf("%s%s%s\n", command, p[0] != '\0' ? " " : "", p);
 
   if (!strcasecmp(command, "acquisitionport")) {
-    parse_int(p, &acquisition_port);
+    parse_int(p, &acquisition_port, 0, 65535);
   } else if (!strcasecmp(command, "allow")) {
     parse_allow_deny(p, ntp_restrictions, 1);
   } else if (!strcasecmp(command, "authselectmode")) {
@@ -582,10 +628,10 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "cmddeny")) {
     parse_allow_deny(p, cmd_restrictions, 0);
   } else if (!strcasecmp(command, "cmdport")) {
-    parse_int(p, &cmd_port);
+    parse_int(p, &cmd_port, 0, 65535);
   } else if (!strcasecmp(command, "cmdratelimit")) {
     parse_ratelimit(p, &cmd_ratelimit_enabled, &cmd_ratelimit_interval,
-                    &cmd_ratelimit_burst, &cmd_ratelimit_leak);
+                    &cmd_ratelimit_burst, &cmd_ratelimit_leak, NULL);
   } else if (!strcasecmp(command, "combinelimit")) {
     parse_double(p, &combine_limit);
   } else if (!strcasecmp(command, "confdir")) {
@@ -595,9 +641,9 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "deny")) {
     parse_allow_deny(p, ntp_restrictions, 0);
   } else if (!strcasecmp(command, "driftfile")) {
-    parse_string(p, &drift_file);
+    parse_driftfile(p);
   } else if (!strcasecmp(command, "dscp")) {
-    parse_int(p, &ntp_dscp);
+    parse_int(p, &ntp_dscp, 0, 63);
   } else if (!strcasecmp(command, "dumpdir")) {
     parse_string(p, &dumpdir);
   } else if (!strcasecmp(command, "dumponexit")) {
@@ -620,14 +666,16 @@ CNF_ParseLine(const char *filename, int number, char *line)
     parse_leapsecmode(p);
   } else if (!strcasecmp(command, "leapsectz")) {
     parse_string(p, &leapsec_tz);
+  } else if (!strcasecmp(command, "leapseclist")) {
+    parse_string(p, &leapsec_list);
   } else if (!strcasecmp(command, "local")) {
     parse_local(p);
   } else if (!strcasecmp(command, "lock_all")) {
-    lock_memory = parse_null(p);
+    parse_null(p, &lock_memory);
   } else if (!strcasecmp(command, "log")) {
     parse_log(p);
   } else if (!strcasecmp(command, "logbanner")) {
-    parse_int(p, &log_banner);
+    parse_int(p, &log_banner, 0, INT_MAX);
   } else if (!strcasecmp(command, "logchange")) {
     parse_double(p, &log_change_threshold);
   } else if (!strcasecmp(command, "logdir")) {
@@ -637,7 +685,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "makestep")) {
     parse_makestep(p);
   } else if (!strcasecmp(command, "manual")) {
-    enable_manual = parse_null(p);
+    parse_null(p, &enable_manual);
   } else if (!strcasecmp(command, "maxchange")) {
     parse_maxchange(p);
   } else if (!strcasecmp(command, "maxclockerror")) {
@@ -649,64 +697,70 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "maxjitter")) {
     parse_double(p, &max_jitter);
   } else if (!strcasecmp(command, "maxntsconnections")) {
-    parse_int(p, &nts_server_connections);
+    parse_int(p, &nts_server_connections, 1, INT_MAX);
   } else if (!strcasecmp(command, "maxsamples")) {
-    parse_int(p, &max_samples);
+    parse_int(p, &max_samples, 0, INT_MAX);
   } else if (!strcasecmp(command, "maxslewrate")) {
     parse_double(p, &max_slew_rate);
   } else if (!strcasecmp(command, "maxupdateskew")) {
     parse_double(p, &max_update_skew);
   } else if (!strcasecmp(command, "minsamples")) {
-    parse_int(p, &min_samples);
+    parse_int(p, &min_samples, 0, INT_MAX);
   } else if (!strcasecmp(command, "minsources")) {
-    parse_int(p, &min_sources);
+    parse_int(p, &min_sources, 1, INT_MAX);
   } else if (!strcasecmp(command, "nocerttimecheck")) {
-    parse_int(p, &no_cert_time_check);
+    parse_int(p, &no_cert_time_check, 0, INT_MAX);
   } else if (!strcasecmp(command, "noclientlog")) {
-    no_client_log = parse_null(p);
+    parse_null(p, &no_client_log);
   } else if (!strcasecmp(command, "nosystemcert")) {
-    no_system_cert = parse_null(p);
+    parse_null(p, &no_system_cert);
   } else if (!strcasecmp(command, "ntpsigndsocket")) {
     parse_string(p, &ntp_signd_socket);
+  } else if (!strcasecmp(command, "ntsaeads")) {
+    parse_ints(p, nts_aeads, 0, INT_MAX);
   } else if (!strcasecmp(command, "ntsratelimit")) {
     parse_ratelimit(p, &nts_ratelimit_enabled, &nts_ratelimit_interval,
-                    &nts_ratelimit_burst, &nts_ratelimit_leak);
+                    &nts_ratelimit_burst, &nts_ratelimit_leak, NULL);
   } else if (!strcasecmp(command, "ntscachedir") ||
              !strcasecmp(command, "ntsdumpdir")) {
     parse_string(p, &nts_dump_dir);
   } else if (!strcasecmp(command, "ntsntpserver")) {
     parse_string(p, &nts_ntp_server);
   } else if (!strcasecmp(command, "ntsport")) {
-    parse_int(p, &nts_server_port);
+    parse_int(p, &nts_server_port, 0, 65535);
   } else if (!strcasecmp(command, "ntsprocesses")) {
-    parse_int(p, &nts_server_processes);
+    parse_int(p, &nts_server_processes, 0, 1000);
   } else if (!strcasecmp(command, "ntsrefresh")) {
-    parse_int(p, &nts_refresh);
+    parse_int(p, &nts_refresh, 0, INT_MAX);
   } else if (!strcasecmp(command, "ntsrotate")) {
-    parse_int(p, &nts_rotate);
+    parse_int(p, &nts_rotate, 0, INT_MAX);
   } else if (!strcasecmp(command, "ntsservercert")) {
     parse_ntsserver(p, nts_server_cert_files);
   } else if (!strcasecmp(command, "ntsserverkey")) {
     parse_ntsserver(p, nts_server_key_files);
   } else if (!strcasecmp(command, "ntstrustedcerts")) {
     parse_ntstrustedcerts(p);
+  } else if (!strcasecmp(command, "opencommands")) {
+    parse_open_commands(p);
   } else if (!strcasecmp(command, "peer")) {
     parse_source(p, command, 1);
   } else if (!strcasecmp(command, "pidfile")) {
-    parse_string(p, &pidfile);
+    parse_pidfile(p);
   } else if (!strcasecmp(command, "pool")) {
     parse_source(p, command, 1);
   } else if (!strcasecmp(command, "port")) {
-    parse_int(p, &ntp_port);
+    parse_int(p, &ntp_port, 0, 65535);
+  } else if (!strcasecmp(command, "ptpdomain")) {
+    parse_int(p, &ptp_domain, 0, 255);
   } else if (!strcasecmp(command, "ptpport")) {
-    parse_int(p, &ptp_port);
+    parse_int(p, &ptp_port, 0, 65535);
   } else if (!strcasecmp(command, "ratelimit")) {
     parse_ratelimit(p, &ntp_ratelimit_enabled, &ntp_ratelimit_interval,
-                    &ntp_ratelimit_burst, &ntp_ratelimit_leak);
+                    &ntp_ratelimit_burst, &ntp_ratelimit_leak, &ntp_ratelimit_kod);
   } else if (!strcasecmp(command, "refclock")) {
     parse_refclock(p);
   } else if (!strcasecmp(command, "refresh")) {
-    parse_int(p, &refresh);
+    parse_int(p, &refresh, 0, INT_MAX);
   } else if (!strcasecmp(command, "reselectdist")) {
     parse_double(p, &reselect_distance);
   } else if (!strcasecmp(command, "rtcautotrim")) {
@@ -716,11 +770,11 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "rtcfile")) {
     parse_string(p, &rtc_file);
   } else if (!strcasecmp(command, "rtconutc")) {
-    rtc_on_utc = parse_null(p);
+    parse_null(p, &rtc_on_utc);
   } else if (!strcasecmp(command, "rtcsync")) {
-    rtc_sync = parse_null(p);
+    parse_null(p, &rtc_sync);
   } else if (!strcasecmp(command, "sched_priority")) {
-    parse_int(p, &sched_priority);
+    parse_int(p, &sched_priority, 0, 100);
   } else if (!strcasecmp(command, "server")) {
     parse_source(p, command, 1);
   } else if (!strcasecmp(command, "smoothtime")) {
@@ -739,7 +793,7 @@ CNF_ParseLine(const char *filename, int number, char *line)
              !strcasecmp(command, "linux_hz")) {
     LOG(LOGS_WARN, "%s directive is no longer supported", command);
   } else {
-    other_parse_error("Invalid directive");
+    other_parse_error("Invalid directive %s", command);
   }
 
   processed_file = processed_command = NULL;
@@ -747,48 +801,70 @@ CNF_ParseLine(const char *filename, int number, char *line)
 
 /* ================================================== */
 
-static int
+static void
 parse_string(char *line, char **result)
 {
   check_number_of_args(line, 1);
   Free(*result);
   *result = Strdup(line);
-  return 1;
 }
 
 /* ================================================== */
 
-static int
-parse_int(char *line, int *result)
+static void
+parse_int(char *line, int *result, int min, int max)
 {
+  char *end;
+  long r;
+
   check_number_of_args(line, 1);
-  if (sscanf(line, "%d", result) != 1) {
+
+  errno = 0;
+  r = strtol(line, &end, 10);
+  if (errno != 0 || *end != '\0')
     command_parse_error();
-    return 0;
-  }
-  return 1;
+  if (r < min || r > max)
+    other_parse_error("Invalid value %ld in %s directive (min %d, max %d)",
+                      r, processed_command, min, max);
+  *result = r;
 }
 
 /* ================================================== */
 
-static int
+static void
 parse_double(char *line, double *result)
 {
   check_number_of_args(line, 1);
   if (sscanf(line, "%lf", result) != 1) {
     command_parse_error();
-    return 0;
   }
-  return 1;
 }
 
 /* ================================================== */
 
-static int
-parse_null(char *line)
+static void
+parse_null(char *line, int *result)
 {
   check_number_of_args(line, 0);
-  return 1;
+  *result = 1;
+}
+
+/* ================================================== */
+
+static void
+parse_ints(char *line, ARR_Instance array, int min, int max)
+{
+  char *s;
+  int v;
+
+  ARR_SetSize(array, 0);
+
+  while (*line) {
+    s = line;
+    line = CPS_SplitWord(line);
+    parse_int(s, &v, min, max);
+    ARR_AppendElement(array, &v);
+  }
 }
 
 /* ================================================== */
@@ -796,6 +872,7 @@ parse_null(char *line)
 static void
 parse_source(char *line, char *type, int fatal)
 {
+  CPS_Status status;
   NTP_Source source;
 
   if (strcasecmp(type, "peer") == 0) {
@@ -816,13 +893,20 @@ parse_source(char *line, char *type, int fatal)
   /* Avoid comparing uninitialized data in compare_sources() */
   memset(&source.params, 0, sizeof (source.params));
 
-  if (!CPS_ParseNTPSourceAdd(line, &source.params)) {
-    if (fatal)
-      command_parse_error();
+  status = CPS_ParseNTPSourceAdd(line, &source.params);
+  if (status != CPS_Success) {
+    if (fatal) {
+      other_parse_error("Invalid %s %s directive",
+                        status == CPS_InvalidOption ? "option in" :
+                        status == CPS_InvalidValue ? "value in" : "syntax for", type);
+    }
     return;
   }
 
   source.params.name = Strdup(source.params.name);
+  source.status = NSR_NoSuchSource;
+  source.conf_id = 0;
+
   ARR_AppendElement(ntp_sources, &source);
 }
 
@@ -840,7 +924,7 @@ parse_sourcedir(char *line)
 /* ================================================== */
 
 static void
-parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak)
+parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak, int *kod)
 {
   int n, val;
   char *opt;
@@ -850,7 +934,7 @@ parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak)
   while (*line) {
     opt = line;
     line = CPS_SplitWord(line);
-    if (sscanf(line, "%d%n", &val, &n) != 1) {
+    if (!SSCANF_IN_RANGE(line, "%d%n", &val, &n, -32, 32)) {
       command_parse_error();
       return;
     }
@@ -861,6 +945,8 @@ parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak)
       *burst = val;
     else if (!strcasecmp(opt, "leak"))
       *leak = val;
+    else if (!strcasecmp(opt, "kod") && kod)
+      *kod = val;
     else
       command_parse_error();
   }
@@ -927,31 +1013,28 @@ parse_refclock(char *line)
       if ((n = CPS_ParseRefid(line, &lock_ref_id)) == 0)
         break;
     } else if (!strcasecmp(cmd, "poll")) {
-      if (sscanf(line, "%d%n", &poll, &n) != 1) {
+      if (!SSCANF_IN_RANGE(line, "%d%n", &poll, &n, -32, 32))
         break;
-      }
     } else if (!strcasecmp(cmd, "dpoll")) {
-      if (sscanf(line, "%d%n", &dpoll, &n) != 1) {
+      if (!SSCANF_IN_RANGE(line, "%d%n", &dpoll, &n, -32, 32))
         break;
-      }
     } else if (!strcasecmp(cmd, "filter")) {
-      if (sscanf(line, "%d%n", &filter_length, &n) != 1) {
+      if (!SSCANF_IN_RANGE(line, "%d%n", &filter_length, &n, 0, INT_MAX))
         break;
-      }
     } else if (!strcasecmp(cmd, "local")) {
       n = 0;
       local = 1;
     } else if (!strcasecmp(cmd, "rate")) {
-      if (sscanf(line, "%d%n", &pps_rate, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &pps_rate, &n, 1, INT_MAX))
         break;
     } else if (!strcasecmp(cmd, "minsamples")) {
-      if (sscanf(line, "%d%n", &min_samples, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &min_samples, &n, 0, INT_MAX))
         break;
     } else if (!strcasecmp(cmd, "maxlockage")) {
-      if (sscanf(line, "%d%n", &max_lock_age, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &max_lock_age, &n, 0, INT_MAX))
         break;
     } else if (!strcasecmp(cmd, "maxsamples")) {
-      if (sscanf(line, "%d%n", &max_samples, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &max_samples, &n, 0, INT_MAX))
         break;
     } else if (!strcasecmp(cmd, "offset")) {
       if (sscanf(line, "%lf%n", &offset, &n) != 1)
@@ -969,8 +1052,7 @@ parse_refclock(char *line)
       if (sscanf(line, "%lf%n", &max_dispersion, &n) != 1)
         break;
     } else if (!strcasecmp(cmd, "stratum")) {
-      if (sscanf(line, "%d%n", &stratum, &n) != 1 ||
-          stratum >= NTP_MAX_STRATUM || stratum < 0)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &stratum, &n, 0, NTP_MAX_STRATUM - 1))
         break;
     } else if (!strcasecmp(cmd, "tai")) {
       n = 0;
@@ -982,13 +1064,13 @@ parse_refclock(char *line)
       n = 0;
       sel_options |= sel_option;
     } else {
-      other_parse_error("Invalid refclock option");
+      other_parse_error("Invalid %s %s directive", "option in", processed_command);
       return;
     }
   }
 
   if (*cmd) {
-    command_parse_error();
+    other_parse_error("Invalid %s %s directive", "value in", processed_command);
     return;
   }
 
@@ -1058,8 +1140,16 @@ parse_log(char *line)
 static void
 parse_local(char *line)
 {
-  if (!CPS_ParseLocal(line, &local_stratum, &local_orphan, &local_distance))
-    command_parse_error();
+  CPS_Status status;
+
+  status = CPS_ParseLocal(line, &local_stratum, &local_orphan, &local_distance,
+                          &local_activate, &local_wait_synced, &local_wait_unsynced);
+  if (status != CPS_Success) {
+    other_parse_error("Invalid %s %s directive",
+                      status == CPS_InvalidOption ? "option in" : "value in",
+                      processed_command);
+  }
+
   enable_local = 1;
 }
 
@@ -1220,6 +1310,72 @@ parse_ntstrustedcerts(char *line)
 
 /* ================================================== */
 
+static void
+add_open_command(int command)
+{
+  int i;
+
+  /* Avoid duplicates */
+  for (i = 0; i < ARR_GetSize(open_commands); i++) {
+    if (*(int *)ARR_GetElement(open_commands, i) == command)
+      return;
+  }
+
+  ARR_AppendElement(open_commands, &command);
+}
+
+/* ================================================== */
+
+static void
+parse_open_commands(char *line)
+{
+  char *s;
+
+  ARR_SetSize(open_commands, 0);
+
+  while (*line) {
+    s = line;
+    line = CPS_SplitWord(line);
+
+    if (strcasecmp(s, "activity") == 0) {
+      add_open_command(REQ_ACTIVITY);
+    } else if (strcasecmp(s, "authdata") == 0) {
+      add_open_command(REQ_N_SOURCES);
+      add_open_command(REQ_AUTH_DATA);
+    } else if (strcasecmp(s, "clients") == 0) {
+      add_open_command(REQ_CLIENT_ACCESSES_BY_INDEX3);
+    } else if (strcasecmp(s, "manual") == 0) {
+      add_open_command(REQ_MANUAL_LIST);
+    } else if (strcasecmp(s, "ntpdata") == 0) {
+      add_open_command(REQ_N_SOURCES);
+      add_open_command(REQ_NTP_DATA);
+    } else if (strcasecmp(s, "rtcdata") == 0) {
+      add_open_command(REQ_RTCREPORT);
+    } else if (strcasecmp(s, "selectdata") == 0) {
+      add_open_command(REQ_N_SOURCES);
+      add_open_command(REQ_SELECT_DATA);
+    } else if (strcasecmp(s, "serverstats") == 0) {
+      add_open_command(REQ_SERVER_STATS);
+    } else if (strcasecmp(s, "smoothing") == 0) {
+      add_open_command(REQ_SMOOTHING);
+    } else if (strcasecmp(s, "sourcename") == 0) {
+      add_open_command(REQ_NTP_SOURCE_NAME);
+    } else if (strcasecmp(s, "sources") == 0) {
+      add_open_command(REQ_N_SOURCES);
+      add_open_command(REQ_SOURCE_DATA);
+    } else if (strcasecmp(s, "sourcestats") == 0) {
+      add_open_command(REQ_N_SOURCES);
+      add_open_command(REQ_SOURCESTATS);
+    } else if (strcasecmp(s, "tracking") == 0) {
+      add_open_command(REQ_TRACKING);
+    } else {
+      command_parse_error();
+    }
+  }
+}
+
+/* ================================================== */
+
 static void
 parse_allow_deny(char *line, ARR_Instance restrictions, int allow)
 {
@@ -1461,17 +1617,17 @@ parse_hwtimestamp(char *line)
     line = CPS_SplitWord(line);
 
     if (!strcasecmp(p, "maxsamples")) {
-      if (sscanf(line, "%d%n", &iface->max_samples, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &iface->max_samples, &n, 0, INT_MAX))
         break;
     } else if (!strcasecmp(p, "minpoll")) {
-      if (sscanf(line, "%d%n", &iface->minpoll, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &iface->minpoll, &n, -32, 32))
         break;
     } else if (!strcasecmp(p, "maxpoll")) {
-      if (sscanf(line, "%d%n", &iface->maxpoll, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &iface->maxpoll, &n, -32, 32))
         break;
       maxpoll_set = 1;
     } else if (!strcasecmp(p, "minsamples")) {
-      if (sscanf(line, "%d%n", &iface->min_samples, &n) != 1)
+      if (!SSCANF_IN_RANGE(line, "%d%n", &iface->min_samples, &n, 0, INT_MAX))
         break;
     } else if (!strcasecmp(p, "precision")) {
       if (sscanf(line, "%lf%n", &iface->precision, &n) != 1)
@@ -1512,6 +1668,20 @@ parse_hwtimestamp(char *line)
 
 /* ================================================== */
 
+static void
+parse_pidfile(char *line)
+{
+  parse_string(line, &pidfile);
+
+  /* / disables the PID file handling */
+  if (strcmp(pidfile, "/") == 0) {
+    Free(pidfile);
+    pidfile = NULL;
+  }
+}
+
+/* ================================================== */
+
 static const char *
 get_basename(const char *path)
 {
@@ -1592,6 +1762,29 @@ parse_confdir(char *line)
 
 /* ================================================== */
 
+static void
+parse_driftfile(char *line)
+{
+  char *path, *opt, *val;
+
+  path = line;
+  opt = CPS_SplitWord(path);
+  val = CPS_SplitWord(opt);
+
+  if (*path == '\0' ||
+      (*opt != '\0' && (strcasecmp(opt, "interval") != 0 ||
+                        sscanf(val, "%d", &drift_file_interval) != 1 ||
+                        *CPS_SplitWord(val) != '\0'))) {
+    command_parse_error();
+    return;
+  }
+
+  Free(drift_file);
+  drift_file = Strdup(path);
+}
+
+/* ================================================== */
+
 static void
 parse_include(char *line)
 {
@@ -1664,6 +1857,8 @@ compare_sources(const void *a, const void *b)
     return d;
   if ((d = (int)sa->pool - (int)sb->pool) != 0)
     return d;
+  if ((d = (int)sa->params.family - (int)sb->params.family) != 0)
+    return d;
   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));
@@ -1676,18 +1871,17 @@ reload_source_dirs(void)
 {
   NTP_Source *prev_sources, *new_sources, *source;
   unsigned int i, j, prev_size, new_size, unresolved;
-  uint32_t *prev_ids, *new_ids;
   char buf[MAX_LINE_LENGTH];
   NSR_Status s;
   int d, pass;
 
-  prev_size = ARR_GetSize(ntp_source_ids);
-  if (prev_size > 0 && ARR_GetSize(ntp_sources) != prev_size)
-    assert(0);
+  /* Ignore reload command before adding configured sources */
+  if (!conf_ntp_sources_added)
+    return;
 
-  /* Save the current sources and their configuration IDs */
-  prev_ids = MallocArray(uint32_t, prev_size);
-  memcpy(prev_ids, ARR_GetElements(ntp_source_ids), prev_size * sizeof (prev_ids[0]));
+  prev_size = ARR_GetSize(ntp_sources);
+
+  /* Save the current sources */
   prev_sources = MallocArray(NTP_Source, prev_size);
   memcpy(prev_sources, ARR_GetElements(ntp_sources), prev_size * sizeof (prev_sources[0]));
 
@@ -1705,8 +1899,6 @@ reload_source_dirs(void)
 
   new_size = ARR_GetSize(ntp_sources);
   new_sources = ARR_GetElements(ntp_sources);
-  ARR_SetSize(ntp_source_ids, new_size);
-  new_ids = ARR_GetElements(ntp_source_ids);
   unresolved = 0;
 
   LOG_SetContext(LOGC_SourceFile);
@@ -1721,30 +1913,31 @@ reload_source_dirs(void)
         d = i < prev_size ? -1 : 1;
 
       /* 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]);
+      if (pass == 0 && d < 0 && prev_sources[i].status == NSR_Success) {
+        NSR_RemoveSourcesById(prev_sources[i].conf_id);
       }
 
-      /* Add new sources */
-      if (pass == 1 && d > 0) {
+      /* Add new sources and sources that could not be added before */
+      if (pass == 1 && (d > 0 || (d == 0 && prev_sources[i].status != NSR_Success))) {
         source = &new_sources[j];
-        s = NSR_AddSourceByName(source->params.name, source->params.port, source->pool,
-                                source->type, &source->params.params, &new_ids[j]);
+        s = NSR_AddSourceByName(source->params.name, source->params.family, source->params.port,
+                                source->pool, source->type, &source->params.params,
+                                &source->conf_id);
+        source->status = s;
 
         if (s == NSR_UnresolvedName) {
           unresolved++;
-        } else if (s != NSR_Success) {
+        } else if (s != NSR_Success && (d > 0 || s != prev_sources[i].status)) {
           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];
+      if (pass == 1 && d == 0) {
+        new_sources[j].status = prev_sources[i].status;
+        new_sources[j].conf_id = prev_sources[i].conf_id;
+      }
     }
   }
 
@@ -1753,7 +1946,6 @@ reload_source_dirs(void)
   for (i = 0; i < prev_size; i++)
     Free(prev_sources[i].params.name);
   Free(prev_sources);
-  Free(prev_ids);
 
   if (unresolved > 0)
     NSR_ResolveSources();
@@ -1842,15 +2034,17 @@ CNF_AddSources(void)
   for (i = 0; i < ARR_GetSize(ntp_sources); i++) {
     source = (NTP_Source *)ARR_GetElement(ntp_sources, i);
 
-    s = NSR_AddSourceByName(source->params.name, source->params.port, source->pool,
-                            source->type, &source->params.params, NULL);
+    s = NSR_AddSourceByName(source->params.name, source->params.family, source->params.port,
+                            source->pool, source->type, &source->params.params, NULL);
     if (s != NSR_Success && s != NSR_UnresolvedName)
       LOG(LOGS_ERR, "Could not add source %s", source->params.name);
 
     Free(source->params.name);
   }
 
+  /* The arrays will be used for sourcedir (re)loading */
   ARR_SetSize(ntp_sources, 0);
+  conf_ntp_sources_added = 1;
 
   reload_source_dirs();
 }
@@ -1916,8 +2110,9 @@ CNF_GetAcquisitionPort(void)
 /* ================================================== */
 
 char *
-CNF_GetDriftFile(void)
+CNF_GetDriftFile(int *interval)
 {
+  *interval = drift_file_interval;
   return drift_file;
 }
 
@@ -2140,6 +2335,14 @@ CNF_GetManualEnabled(void)
 
 /* ================================================== */
 
+ARR_Instance
+CNF_GetOpenCommands(void)
+{
+  return open_commands;
+}
+
+/* ================================================== */
+
 int
 CNF_GetCommandPort(void) {
   return cmd_port;
@@ -2148,12 +2351,16 @@ CNF_GetCommandPort(void) {
 /* ================================================== */
 
 int
-CNF_AllowLocalReference(int *stratum, int *orphan, double *distance)
+CNF_AllowLocalReference(int *stratum, int *orphan, double *distance, double *activate,
+                        double *wait_synced, double *wait_unsynced)
 {
   if (enable_local) {
     *stratum = local_stratum;
     *orphan = local_orphan;
     *distance = local_distance;
+    *activate = local_activate;
+    *wait_synced = local_wait_synced;
+    *wait_unsynced = local_wait_unsynced;
     return 1;
   } else {
     return 0;
@@ -2386,6 +2593,14 @@ CNF_GetLeapSecTimezone(void)
 
 /* ================================================== */
 
+char *
+CNF_GetLeapSecList(void)
+{
+  return leapsec_list;
+}
+
+/* ================================================== */
+
 int
 CNF_GetSchedPriority(void)
 {
@@ -2402,11 +2617,12 @@ CNF_GetLockMemory(void)
 
 /* ================================================== */
 
-int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak)
+int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak, int *kod)
 {
   *interval = ntp_ratelimit_interval;
   *burst = ntp_ratelimit_burst;
   *leak = ntp_ratelimit_leak;
+  *kod = ntp_ratelimit_kod;
   return ntp_ratelimit_enabled;
 }
 
@@ -2540,6 +2756,14 @@ CNF_GetPtpPort(void)
 
 /* ================================================== */
 
+int
+CNF_GetPtpDomain(void)
+{
+  return ptp_domain;
+}
+
+/* ================================================== */
+
 int
 CNF_GetRefresh(void)
 {
@@ -2548,6 +2772,14 @@ CNF_GetRefresh(void)
 
 /* ================================================== */
 
+ARR_Instance
+CNF_GetNtsAeads(void)
+{
+  return nts_aeads;
+}
+
+/* ================================================== */
+
 char *
 CNF_GetNtsDumpDir(void)
 {
@@ -2624,8 +2856,7 @@ CNF_GetNtsTrustedCertsPaths(const char ***paths, uint32_t **ids)
   *paths = ARR_GetElements(nts_trusted_certs_paths);
   *ids = ARR_GetElements(nts_trusted_certs_ids);
 
-  if (ARR_GetSize(nts_trusted_certs_paths) != ARR_GetSize(nts_trusted_certs_ids))
-    assert(0);
+  BRIEF_ASSERT(ARR_GetSize(nts_trusted_certs_paths) == ARR_GetSize(nts_trusted_certs_ids));
 
   return ARR_GetSize(nts_trusted_certs_paths);
 }

conf.h

@@ -29,6 +29,7 @@
 #define GOT_CONF_H
 
 #include "addressing.h"
+#include "array.h"
 #include "reference.h"
 #include "sources.h"
 
@@ -55,7 +56,7 @@ extern void CNF_ReloadSources(void);
 
 extern int CNF_GetAcquisitionPort(void);
 extern int CNF_GetNTPPort(void);
-extern char *CNF_GetDriftFile(void);
+extern char *CNF_GetDriftFile(int *interval);
 extern char *CNF_GetLogDir(void);
 extern char *CNF_GetDumpDir(void);
 extern int CNF_GetLogBanner(void);
@@ -69,6 +70,7 @@ extern int CNF_GetLogTempComp(void);
 extern char *CNF_GetKeysFile(void);
 extern char *CNF_GetRtcFile(void);
 extern int CNF_GetManualEnabled(void);
+extern ARR_Instance CNF_GetOpenCommands(void);
 extern int CNF_GetCommandPort(void);
 extern int CNF_GetRtcOnUtc(void);
 extern int CNF_GetRtcSync(void);
@@ -91,6 +93,7 @@ extern char *CNF_GetNtpSigndSocket(void);
 extern char *CNF_GetPidFile(void);
 extern REF_LeapMode CNF_GetLeapSecMode(void);
 extern char *CNF_GetLeapSecTimezone(void);
+extern char *CNF_GetLeapSecList(void);
 
 /* Value returned in ppm, as read from file */
 extern double CNF_GetMaxUpdateSkew(void);
@@ -107,14 +110,15 @@ extern double CNF_GetReselectDistance(void);
 extern double CNF_GetStratumWeight(void);
 extern double CNF_GetCombineLimit(void);
 
-extern int CNF_AllowLocalReference(int *stratum, int *orphan, double *distance);
+extern int CNF_AllowLocalReference(int *stratum, int *orphan, double *distance, double *activate,
+                                   double *wait_synced, double *wait_unsynced);
 
 extern void CNF_SetupAccessRestrictions(void);
 
 extern int CNF_GetSchedPriority(void);
 extern int CNF_GetLockMemory(void);
 
-extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak);
+extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak, int *kod);
 extern int CNF_GetNtsRateLimit(int *interval, int *burst, int *leak);
 extern int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak);
 extern void CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only);
@@ -158,9 +162,11 @@ extern int CNF_GetHwTsInterface(unsigned int index, CNF_HwTsInterface **iface);
 extern double CNF_GetHwTsTimeout(void);
 
 extern int CNF_GetPtpPort(void);
+extern int CNF_GetPtpDomain(void);
 
 extern int CNF_GetRefresh(void);
 
+extern ARR_Instance CNF_GetNtsAeads(void);
 extern char *CNF_GetNtsDumpDir(void);
 extern char *CNF_GetNtsNtpServer(void);
 extern int CNF_GetNtsServerCertAndKeyFiles(const char ***certs, const char ***keys);

configure

@@ -116,7 +116,6 @@ For better control, use the options below.
   --without-tomcrypt     Don't use libtomcrypt even if it is available
   --disable-nts          Disable NTS support
   --disable-cmdmon       Disable command and monitoring support
-  --disable-ntp          Disable NTP support
   --disable-refclock     Disable reference clock support
   --disable-phc          Disable PHC refclock driver
   --disable-pps          Disable PPS refclock driver
@@ -126,7 +125,6 @@ For better control, use the options below.
   --without-libcap       Don't use libcap even if it is available
   --enable-scfilter      Enable support for system call filtering
   --without-seccomp      Don't use seccomp even if it is available
-  --disable-asyncdns     Disable asynchronous name resolving
   --disable-forcednsretry Don't retry on permanent DNS error
   --without-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
@@ -219,7 +217,6 @@ EXTRA_CLI_OBJECTS=""
 
 feat_debug=0
 feat_cmdmon=1
-feat_ntp=1
 feat_refclock=1
 feat_readline=1
 try_editline=1
@@ -243,7 +240,6 @@ try_phc=0
 feat_pps=1
 try_setsched=0
 try_lockmem=0
-feat_asyncdns=1
 feat_forcednsretry=1
 try_aes_gcm_siv=1
 try_clock_gettime=1
@@ -253,7 +249,6 @@ feat_timestamping=1
 try_timestamping=0
 feat_ntp_signd=0
 ntp_era_split=""
-use_pthread=0
 default_user="root"
 default_hwclockfile=""
 default_pidfile="/var/run/chrony/chronyd.pid"
@@ -308,9 +303,6 @@ do
     --disable-cmdmon)
       feat_cmdmon=0
     ;;
-    --disable-ntp)
-      feat_ntp=0
-    ;;
     --disable-refclock)
       feat_refclock=0
     ;;
@@ -341,9 +333,6 @@ do
     --without-seccomp)
       try_seccomp=0
     ;;
-    --disable-asyncdns)
-      feat_asyncdns=0
-    ;;
     --disable-forcednsretry)
       feat_forcednsretry=0
     ;;
@@ -504,27 +493,15 @@ if [ $feat_cmdmon = "1" ]; then
   EXTRA_OBJECTS="$EXTRA_OBJECTS cmdmon.o manual.o pktlength.o"
 fi
 
-if [ $feat_ntp = "1" ]; then
-  add_def FEAT_NTP
-  EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_auth.o ntp_core.o ntp_ext.o ntp_io.o ntp_sources.o"
-  if [ $feat_ntp_signd = "1" ]; then
-    add_def FEAT_SIGND
-    EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_signd.o"
-  fi
-else
-  feat_asyncdns=0
-  feat_timestamping=0
-fi
-
-if [ "$feat_cmdmon" = "1" ] || [ $feat_ntp = "1" ]; then
-  EXTRA_OBJECTS="$EXTRA_OBJECTS addrfilt.o clientlog.o keys.o nameserv.o"
-else
-  feat_ipv6=0
+if [ $feat_ntp_signd = "1" ]; then
+  add_def FEAT_SIGND
+  EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_signd.o"
 fi
 
 if [ $feat_refclock = "1" ]; then
   add_def FEAT_REFCLOCK
-  EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o refclock_shm.o refclock_sock.o"
+  EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o \
+    refclock_rtc.o refclock_shm.o refclock_sock.o"
 fi
 
 MYCC="$CC"
@@ -705,15 +682,15 @@ then
   exit 1
 fi
 
-if [ $feat_asyncdns = "1" ] && \
-  test_code 'pthread' 'pthread.h' '-pthread' '' '
-    pthread_t thread;
-    return (int)pthread_create(&thread, NULL, (void *)1, NULL);'
+if test_code 'pthread' 'pthread.h' '-pthread' '' '
+  pthread_t thread;
+  return (int)pthread_create(&thread, NULL, (void *)1, NULL);'
 then
-  add_def FEAT_ASYNCDNS
   add_def USE_PTHREAD_ASYNCDNS
-  EXTRA_OBJECTS="$EXTRA_OBJECTS nameserv_async.o"
-  use_pthread=1
+  MYCFLAGS="$MYCFLAGS -pthread"
+else
+  echo "error: pthread_create() not found"
+  exit 1
 fi
 
 if [ $try_arc4random = "1" ] && \
@@ -816,12 +793,10 @@ if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
     'seccomp_init(SCMP_ACT_KILL);'
 then
   add_def FEAT_SCFILTER
-  if [ $feat_ntp = "1" ]; then
-    # NAME2IPADDRESS shouldn't be enabled together with a privops operation
-    # used by the main thread as the helper process works on one request at
-    # a time and the async resolver would block the main thread
-    priv_ops="NAME2IPADDRESS RELOADDNS"
-  fi
+  # NAME2IPADDRESS shouldn't be enabled together with a privops operation
+  # used by the main thread as the helper process works on one request at
+  # a time and the async resolver would block the main thread
+  priv_ops="NAME2IPADDRESS RELOADDNS"
   EXTRA_LIBS="$EXTRA_LIBS -lseccomp"
 fi
 
@@ -860,7 +835,6 @@ if [ $try_setsched = "1" ] && \
      pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched);'
 then
   add_def HAVE_PTHREAD_SETSCHEDPARAM
-  use_pthread=1
 fi
 
 if [ $try_lockmem = "1" ] && \
@@ -914,6 +888,7 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nettle = "1" ];
     HASH_OBJ="hash_nettle.o"
     HASH_LINK="$test_link"
     MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
+    add_def HAVE_NETTLE
     add_def FEAT_SECHASH
 
     if test_code 'CMAC in nettle' 'nettle/cmac.h' "$test_cflags" "$test_link" \
@@ -923,6 +898,13 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nettle = "1" ];
       EXTRA_OBJECTS="$EXTRA_OBJECTS cmac_nettle.o"
       EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS cmac_nettle.o"
     fi
+
+    if test_code 'nettle_memeql_sec()' 'nettle/memops.h' \
+      "$test_cflags" "$test_link" \
+      'return nettle_memeql_sec("", "", 0);'
+    then
+      add_def HAVE_NETTLE_MEMEQL
+    fi
   fi
 fi
 
@@ -936,6 +918,7 @@ if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_gnutls = "1" ];
     HASH_OBJ="hash_gnutls.o"
     HASH_LINK="$test_link"
     MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
+    add_def HAVE_GNUTLS
     add_def FEAT_SECHASH
 
     if test_code 'CMAC in gnutls' 'gnutls/crypto.h' "$test_cflags" "$test_link" \
@@ -977,7 +960,7 @@ EXTRA_OBJECTS="$EXTRA_OBJECTS $HASH_OBJ"
 EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS $HASH_OBJ"
 LIBS="$LIBS $HASH_LINK"
 
-if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
+if [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
   if [ "$HASH_OBJ" = "hash_gnutls.o" ]; then
     test_cflags=""
     test_link=""
@@ -997,7 +980,6 @@ if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
     then
       EXTRA_OBJECTS="$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,
@@ -1025,13 +1007,6 @@ if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
         then
           add_def HAVE_GNUTLS_AEAD_CIPHER_SET_KEY
         fi
-      else
-        if test_code 'AES128 in nettle' 'nettle/aes.h' '' "$LIBS" \
-          'aes128_set_encrypt_key((void *)1, (void *)2);'
-        then
-          EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
-          add_def HAVE_SIV
-        fi
       fi
     fi
 
@@ -1045,10 +1020,6 @@ if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
   fi
 fi
 
-if [ $use_pthread = "1" ]; then
-  MYCFLAGS="$MYCFLAGS -pthread"
-fi
-
 SYSCONFDIR=/etc
 if [ "x$SETSYSCONFDIR" != "x" ]; then
   SYSCONFDIR=$SETSYSCONFDIR
@@ -1114,7 +1085,7 @@ add_def MAIL_PROGRAM "\"$mail_program\""
 
 common_features="`get_features SECHASH IPV6 DEBUG`"
 chronyc_features="`get_features READLINE`"
-chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SIGND ASYNCDNS NTS`"
+chronyd_features="`get_features CMDMON REFCLOCK RTC PRIVDROP SCFILTER SIGND NTS`"
 add_def CHRONYC_FEATURES "\"$chronyc_features $common_features\""
 add_def CHRONYD_FEATURES "\"$chronyd_features $common_features\""
 echo "Features : $chronyd_features $chronyc_features $common_features"

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  2009-2023
+// Copyright (C) Miroslav Lichvar  2009-2024
 //
 // 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
@@ -69,12 +69,19 @@ also when the <<chronyc.adoc#online,*online*>> command is issued in *chronyc*.
 +
 The DNS record can change over time. The used address will be replaced with a
 newly resolved address when the server becomes unreachable (i.e. no valid
-response to last 8 requests), unsynchronised, a falseticker (i.e. does not
+response to the 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.
+automatic replacement happens at most once per 30 minutes and only one
+server can be replaced at a time. The address is also refreshed periodically
+when the server is working normally (the interval can be configured by the
+<<refresh,*refresh*>> directive).
 +
-This directive can be used multiple times to specify multiple servers.
+This directive can be used multiple times to specify multiple servers. Each
+server must have a different IP address to be usable by *chronyd*. If a server
+is specified by a hostname that resolves only to addresses already used by
+other servers, the server will be treated as having an unknown address (e.g.
+reported by the *chronyc* <<chronyc.adoc#activity,*activity*>> command).
 +
 The directive supports the following options:
 +
@@ -108,13 +115,13 @@ the current interval needs to be at least two times longer than the minimum
 interval in order to allow a burst with two requests.
 *key* _ID_:::
 The NTP protocol supports a message authentication code (MAC) to prevent
-computers having their system time upset by rogue packets being sent to them.
+computers from having their system time upset by rogue packets being sent to them.
 The MAC is generated as a function of a key specified in the key file,
 which is specified by the <<keyfile,*keyfile*>> directive.
 +
 The *key* option specifies which key (with an ID in the range 1 through 2^32-1)
-should *chronyd* use to authenticate requests sent to the server and verify its
-responses. The server must have the same key for this number configured,
+*chronyd* should use to authenticate requests sent to the server and verify its
+responses. The server must have the same key for this number configured;
 otherwise no relationship between the computers will be possible.
 +
 If the server is running *ntpd* and the output size of the hash function used
@@ -126,6 +133,15 @@ mechanism. Unlike with the *key* option, the server and client do not need to
 share a key in a key file. NTS has a Key Establishment (NTS-KE) protocol using
 the Transport Layer Security (TLS) protocol to get the keys and cookies
 required by NTS for authentication of NTP packets.
++
+With this option, the hostname specified in the server or pool directive is the
+NTS-KE server or pool of NTS-KE servers, respectively. The NTP server usually
+runs on the same host, but it can be separated from the NTS-KE server (the
+hostname or address of the NTP server is provided to the client by the NTS-KE
+server).
++
+The NTS-KE server can be specified by IP address if it is included in the
+server's certificate as a Subject Alternative Name (SAN).
 *certset* _ID_:::
 This option specifies which set of trusted certificates should be used to verify
 the server's certificate when the *nts* option is enabled. Sets of certificates
@@ -136,10 +152,10 @@ default trusted certificate authorities.
 *chronyd* uses the network round-trip delay to the server to determine how
 accurate a particular measurement is likely to be. Long round-trip delays
 indicate that the request, or the response, or both were delayed. If only one
-of the messages was delayed the measurement error is likely to be substantial.
+of the messages was delayed, the measurement error is likely to be substantial.
 +
 For small variations in the round-trip delay, *chronyd* uses a weighting scheme
-when processing the measurements. However, beyond a certain level of delay the
+when processing the measurements. Beyond a certain level of delay, however, the
 measurements are likely to be so corrupted as to be useless. (This is
 particularly so on wireless networks and other slow links, where a long delay
 probably indicates a highly asymmetric delay caused by the response waiting
@@ -149,7 +165,7 @@ If the user knows that round trip delays above a certain level should cause the
 measurement to be ignored, this level can be defined with the *maxdelay*
 option. For example, *maxdelay 0.3* would indicate that measurements with a
 round-trip delay greater than 0.3 seconds should be ignored. The default value
-is 3 seconds and the maximum value is 1000 seconds.
+is 3 seconds, and the maximum value is 1000 seconds.
 *maxdelayratio* _ratio_:::
 This option is similar to the *maxdelay* option above. *chronyd* keeps a record
 of the minimum round-trip delay amongst the previous measurements that it has
@@ -189,7 +205,7 @@ The asymmetry can be between -0.5 and +0.5. A negative value means the delay of
 packets sent to the source is more variable than the delay of packets sent from
 the source back. By default, *chronyd* estimates the asymmetry automatically.
 *offset* _offset_:::
-This option specifies a correction (in seconds) which will be applied to
+This option specifies a correction (in seconds) that will be applied to
 offsets measured with this source. It's particularly useful to compensate for a
 known asymmetry in network delay or timestamping errors. For example, if
 packets sent to the source were on average delayed by 100 microseconds more
@@ -220,7 +236,7 @@ when disconnecting the network link. (It will still be necessary to use the
 <<chronyc.adoc#online,*online*>> command when the link has been established, to
 enable measurements to start.)
 *prefer*:::
-Prefer this source over sources without the *prefer* option.
+Prefer this source over other selectable sources without the *prefer* option.
 *noselect*:::
 Never select this source. This is particularly useful for monitoring.
 *trust*:::
@@ -283,7 +299,7 @@ included in a *server* directive:
 presend 9
 ----
 +
-when the polling interval is 512 seconds or more, an extra NTP client packet
+When the polling interval is 512 seconds or more, an extra NTP client packet
 will be sent to the server a short time (2 seconds) before making the actual
 measurement.
 +
@@ -294,7 +310,7 @@ When the synchronisation source is selected from available sources, sources
 with lower stratum are normally slightly preferred. This option can be used to
 increase stratum of the source to the specified minimum, so *chronyd* will
 avoid selecting that source. This is useful with low-stratum sources that are
-known to be unreliable or inaccurate and which should be used only when other
+known to be unreliable or inaccurate and that should be used only when other
 sources are unreachable.
 *version* _version_:::
 This option sets the NTP version of packets sent to the server. This can be
@@ -302,7 +318,7 @@ useful when the server runs an old NTP implementation that does not respond to
 requests using a newer version. The default version depends on other options.
 If the *extfield* or *xleave* option is used, the default version is 4. If
 those options are not used and the *key* option specifies a key using a hash
-function with output size longer than 160 bits (e.g. SHA256), the default
+function with an output size longer than 160 bits (e.g. SHA256), the default
 version is 3 for compatibility with older *chronyd* servers. In other cases,
 the default version is 4.
 *copy*:::
@@ -343,6 +359,12 @@ 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.
+*ipv4*:::
+*ipv6*:::
+These options force *chronyd* to use only IPv4 or IPv6 addresses respectively
+for this source. They do not override the *-4* or *-6* option on the *chronyd*
+command line.
+
 {blank}:::
 
 [[pool]]*pool* _name_ [_option_]...::
@@ -359,7 +381,7 @@ directive too. There is one option specific to the *pool* directive:
 *maxsources* _sources_:::
 This option sets the desired number of sources to be used from the pool.
 *chronyd* will repeatedly try to resolve the name until it gets this number of
-sources responding to requests. The default value is 4 and the maximum value is
+sources responding to requests. The default value is 4, and the maximum value is
 16.
 +
 An example of the *pool* directive is
@@ -383,7 +405,7 @@ The following options of the *server* directive do not work in the *peer*
 directive: *iburst*, *burst*, *nts*, *presend*, *copy*.
 +
 When using the *xleave* option, both peers must support and have enabled the
-interleaved mode, otherwise the synchronisation will work in one direction
+interleaved mode; otherwise the synchronisation will work in one direction
 only.
 When a key is specified by the *key* option to enable authentication, both
 peers must use the same key and the same key number.
@@ -411,7 +433,7 @@ recommended to use two separate client/server associations (specified by the
 directive.)
 +
 The purpose of the *initstepslew* directive is to allow *chronyd* to make a
-rapid measurement of the system clock error at boot time, and to correct the
+rapid measurement of the system clock error at boot time and to correct the
 system clock by stepping before normal operation begins. Since this would
 normally be performed only at an appropriate point in the system boot sequence,
 no other software should be adversely affected by the step.
@@ -440,7 +462,7 @@ The *initstepslew* directive can also be used in an isolated LAN environment,
 where the clocks are set manually. The most stable computer is chosen as the
 primary server and the other computers are its clients. If each of the clients
 is configured with the <<local,*local*>> directive, the server can be set up
-with an *initstepslew* directive which references some or all of the clients.
+with an *initstepslew* directive that references some or all of the clients.
 Then, if the server machine has to be rebooted, the clients can be relied on to
 act analogously to a flywheel and preserve the time for a short period while
 the server completes its reboot.
@@ -463,7 +485,7 @@ the driver-specific parameter using the *:* character.
 +
 This directive can be used multiple times to specify multiple reference clocks.
 +
-There are four drivers included in *chronyd*:
+There are five drivers included in *chronyd*:
 +
 *PPS*:::
 Driver for the kernel PPS (pulse per second) API. The parameter is the path to
@@ -493,7 +515,7 @@ 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
+An application that 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
@@ -542,8 +564,9 @@ refclock SHM 1:perm=0644 refid GPS2
 ----
 +
 *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
+PTP hardware clock (PHC) driver. The parameter is the absolute path to the
+device of the PTP clock which should be used as a time source, or the name of
+the network interface whose PTP clock should be used. If the clock is kept in
 TAI instead of UTC (e.g. it is synchronised by a PTP daemon), the current
 UTC-TAI offset needs to be specified by the *offset* option. Alternatively, the
 *pps* refclock option can be enabled to treat the PHC as a PPS refclock, using
@@ -581,6 +604,23 @@ refclock PHC /dev/ptp1:nocrossts poll 3 pps
 refclock PHC /dev/ptp2:extpps:pin=1 width 0.2 poll 2
 ----
 +
+*RTC*:::
+Driver for using the Real Time Clock (RTC) as a reference clock. The parameter
+is the path to the RTC character device which should be used as a time source.
+This driver cannot be used together with the <<rtcfile,*rtcfile*>> or
+<<rtcsync,*rtcsync*>> directive. The driver supports the following option:
++
+*utc*::::
+Assume that RTC keeps Universal Coordinated Time (UTC) instead of local
+time.
+{blank}:::
++
+Examples:
++
+----
+refclock RTC /dev/rtc0:utc
+----
++
 {blank}::
 The *refclock* directive supports the following options:
 +
@@ -607,18 +647,18 @@ specified by its reference ID. In this mode received PPS samples are paired
 directly with raw samples from the specified refclock.
 *rate* _rate_:::
 This option sets the rate of the pulses in the PPS signal (in Hz). This option
-controls how the pulses will be completed with real time. To actually receive
+controls how the pulses will be completed with real time. In order to receive
 more than one pulse per second, a negative *dpoll* has to be specified (-3 for
 a 5Hz signal). The default is 1.
 *maxlockage* _pulses_:::
-This option specifies in number of pulses how old can be samples from the
+This option specifies in number of pulses how old samples can be from the
 refclock specified by the *lock* option to be paired with the pulses.
 Increasing this value is useful when the samples are produced at a lower rate
 than the pulses. The default is 2.
 *width* _width_:::
 This option specifies the width of the pulses (in seconds). It is used to
 filter PPS samples when the driver provides samples for both rising and falling
-edges. Note that it reduces the maximum allowed error of the time source which
+edges. Note that it reduces the maximum allowed error of the time source that
 completes the PPS samples. If the duty cycle is configurable, 50% should be
 preferred in order to maximise the allowed error.
 *pps*:::
@@ -632,7 +672,7 @@ offset (in seconds) is applied to all samples produced by the reference clock.
 The default is 0.0.
 *delay* _delay_:::
 This option sets the NTP delay of the source (in seconds). Half of this value
-is included in the maximum assumed error which is used in the source selection
+is included in the maximum assumed error, which is used in the source selection
 algorithm. Increasing the delay is useful to avoid having no majority in the
 source selection or to make it prefer other sources. The default is 1e-9 (1
 nanosecond).
@@ -646,16 +686,15 @@ value is the estimated precision of the system clock.
 Maximum allowed dispersion for filtered samples (in seconds). Samples with
 larger estimated dispersion are ignored. By default, this limit is disabled.
 *filter* _samples_:::
-This option sets the length of the median filter which is used to reduce the
-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. 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_).
+This option sets the maximum number of samples that can be stored in the median
+filter between polls of the source. The filter combines about 60 percent of the
+samples closest to the median offset into one sample. If more samples are
+received by the driver between polls, the oldest samples will be dropped. One
+sample per poll is sufficient for the source to be selectable. The default
+is 64. Note that the PHC driver has additional filtering based on the reading
+delay.
 *prefer*:::
-Prefer this source over sources without the prefer option.
+Prefer this source over other selectable sources without the *prefer* option.
 *noselect*:::
 Never select this source. This is useful for monitoring or with sources which
 are not very accurate, but are locked with a PPS refclock.
@@ -674,9 +713,10 @@ trusted and required source.
 *tai*:::
 This option indicates that the reference clock keeps time in TAI instead of UTC
 and that *chronyd* should correct its offset by the current TAI-UTC offset. The
-<<leapsectz,*leapsectz*>> directive must be used with this option and the
-database must be kept up to date in order for this correction to work as
-expected. This option does not make sense with PPS refclocks.
+<<leapsectz,*leapsectz*>> or <<leapseclist,*leapseclist*>> directive must be
+used with this option and the database must be kept up to date in order for
+this correction to work as expected. This option does not make sense with PPS
+refclocks.
 *local*:::
 This option specifies that the reference clock is an unsynchronised clock which
 is more stable than the system clock (e.g. TCXO, OCXO, or atomic clock) and
@@ -817,6 +857,34 @@ changes in the frequency and offset of the clock. The offsets in the
 <<chronyc.adoc#sourcestats,*sourcestats*>> reports (and the _tracking.log_ and
 _statistics.log_ files) may be smaller than the actual offsets.
 
+[[ntsaeads1]]*ntsaeads* _ID_...::
+This directive specifies a list of IDs of Authenticated Encryption with
+Associated Data (AEAD) algorithms enabled for NTS authentication of NTP
+messages. The algorithms are specified in decreasing order of priority.
+Algorithms that are not supported by the installed version of the crypto
+library (Nettle, GnuTLS) are ignored.
++
+The following IDs are supported:
++
+* 15: AES-SIV-CMAC-256
+* 30: AES-128-GCM-SIV
+{blank}::
++
+The default list of IDs is _30 15_. AES-128-GCM-SIV is preferred over
+AES-SIV-CMAC-256 for shorter keys, which makes NTS cookies shorter and improves
+reliability of NTS in networks that block or limit rate of longer NTP messages.
++
+The ID of the used algorithm is reported for each server by the
+<<chronyc.adoc#authdata,*authdata*>> command.
++
+An example of the directive is:
++
+----
+ntsaeads 15
+----
++
+This list is used also by the <<ntsaeads2,NTS server>>.
+
 [[ntsdumpdir1]]*ntsdumpdir* _directory_::
 This directive specifies a directory for the client to save NTS cookies it
 received from the server in order to avoid making an NTS-KE request when
@@ -845,7 +913,7 @@ 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 trusted certificates
-(in the PEM format) which are needed to verify certificates of NTS-KE servers,
+(in the PEM format) that are needed to verify certificates of NTS-KE servers,
 e.g. certificates of trusted certificate authorities (CA) or self-signed
 certificates of the servers.
 +
@@ -880,7 +948,7 @@ specified by the *ntstrustedcerts* directive will be trusted.
 [[nocerttimecheck]]*nocerttimecheck* _limit_::
 This directive disables the checks of the activation and expiration times of
 certificates for the specified number of clock updates. It allows the NTS
-authentication mechanism to be used on computers which start with wrong time
+authentication mechanism to be used on computers which start with the wrong time
 (e.g. due to not having an RTC or backup battery). Disabling the time checks
 has important security implications and should be used only as a last resort,
 preferably with a minimal number of trusted certificates. The default value is
@@ -894,17 +962,18 @@ nocerttimecheck 1
 +
 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.
+with the 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
+This directive specifies the minimum 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.
+Only one source is refreshed at a time and only when a valid response is
+received (unreachable sources are replaced independently). 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.
@@ -917,11 +986,11 @@ authentication to limit the impact of man-in-the-middle attacks. The
 attackers can drop or delay NTP packets (up to the *maxdelay* and
 <<maxdistance,*maxdistance*>> limits), but they cannot modify the timestamps
 contained in the packets. The attack can cause only a limited slew or step, and
-also cause the clock to run faster or slower than real time (up to double of
+also cause the clock to run faster or slower than real time (up to double
 the <<maxdrift,*maxdrift*>> limit).
 +
 When authentication is enabled for an NTP source, it is important to disable
-unauthenticated NTP sources which could be exploited in the attack, e.g. if
+unauthenticated NTP sources that could be exploited in the attack, e.g. if
 they are not reachable only over a trusted network. Alternatively, the source
 selection can be configured with the *require* and *trust* options to
 synchronise to the unauthenticated sources only if they agree with the
@@ -997,7 +1066,7 @@ If the selected source was specified with the *prefer* option, it can be
 combined only with other sources specified with this option.
 +
 By default, the limit is 3. Setting the limit to 0 effectively disables the
-source combining algorithm and only the selected source will be used to control
+source-combining algorithm and only the selected source will be used to control
 the system clock.
 
 [[maxdistance]]*maxdistance* _distance_::
@@ -1026,14 +1095,14 @@ considered as selectable in the source selection algorithm before the local
 clock is updated. The default value is 1.
 +
 Setting this option to a larger number can be used to improve the reliability.
-More sources will have to agree with each other and the clock will not be
+More sources will have to agree with each other, and the clock will not be
 updated when only one source (which could be serving incorrect time) is
 reachable.
 
 [[reselectdist]]*reselectdist* _distance_::
 When *chronyd* selects a synchronisation source from available sources, it
-will prefer the one with the shortest synchronisation distance. However, to
-avoid frequent reselecting when there are sources with similar distance, a
+will prefer the one with the shortest synchronisation distance. To avoid
+frequent reselecting when there are sources with similar distance, however, a
 fixed distance is added to the distance for sources that are currently not
 selected. This can be set with the *reselectdist* directive. By default, the
 distance is 100 microseconds.
@@ -1053,11 +1122,11 @@ distances are in milliseconds.
 The *clockprecision* directive specifies the precision of the system clock (in
 seconds). It is used by *chronyd* to estimate the minimum noise in NTP
 measurements and randomise low-order bits of timestamps in NTP responses. By
-default, the precision is measured on start as the minimum time to read the
+default, the precision is measured on start-up as the minimum time to read the
 clock.
 +
-The measured value works well in most cases. However, it generally
-overestimates the precision and it can be sensitive to the CPU speed, which can
+The measured value works well in most cases. It generally overestimates the
+precision and it can be sensitive to the CPU speed, however, which can
 change over time to save power. In some cases with a high-precision clocksource
 (e.g. the Time Stamp Counter of the CPU) and hardware timestamping, setting the
 precision on the server to a smaller value can improve stability of clients'
@@ -1080,7 +1149,7 @@ The *corrtimeratio* directive sets the ratio between the duration in which the
 clock is slewed for an average correction according to the source history and
 the interval in which the corrections are done (usually the NTP polling
 interval). Corrections larger than the average take less time and smaller
-corrections take more time, the amount of the correction and the correction
+corrections take more time; the amount of the correction and the correction
 time are inversely proportional.
 +
 Increasing *corrtimeratio* improves the overall frequency error of the system
@@ -1093,7 +1162,7 @@ The maximum allowed slew rate can be set by the <<maxslewrate,*maxslewrate*>>
 directive. The current remaining correction is shown in the
 <<chronyc.adoc#tracking,*tracking*>> report as the *System time* value.
 
-[[driftfile]]*driftfile* _file_::
+[[driftfile]]*driftfile* _file_ [*interval* _interval_]::
 One of the main activities of the *chronyd* program is to work out the rate at
 which the system clock gains or loses time relative to real time.
 +
@@ -1112,6 +1181,10 @@ microseconds in reality (so the true time has only advanced by 999900
 microseconds). The second is an estimate of the error bound around the first
 value in which the true rate actually lies.
 +
+The *interval* option specifies the minimum interval between updates of the
+file in seconds. The file is written only on an update of the local clock.
+The default interval is 3600 seconds.
++
 An example of the driftfile directive is:
 +
 ----
@@ -1135,7 +1208,7 @@ fallbackdrift 16 19
 +
 In this example, the minimum interval is 16 (18 hours) and the maximum interval is
 19 (6 days). The system clock frequency will be set to the first fallback 18
-hours after last clock update, to the second after 36 hours, and so on. This
+hours after the last clock update, to the second after 36 hours, and so on. This
 might be a good setting to cover frequency changes due to daily and weekly
 temperature fluctuations. When the frequency is set to a fallback, the state of
 the clock will change to '`Not synchronised`'.
@@ -1194,7 +1267,7 @@ When smearing a leap second, the leap status is suppressed on the server and
 the served time is corrected slowly by slewing instead of stepping. The clients
 do not need any special configuration as they do not know there is any leap
 second and they follow the server time which eventually brings them back to
-UTC. Care must be taken to ensure they use only NTP servers which smear the
+UTC. Care must be taken to ensure they use only NTP servers that smear the
 leap second in exactly the same way for synchronisation.
 +
 This feature must be used carefully, because the server is intentionally not
@@ -1227,15 +1300,15 @@ duration = sqrt(4 / wander)
 
 [[leapsectz]]*leapsectz* _timezone_::
 This directive specifies a timezone in the system timezone database which
-*chronyd* can use to determine when will the next leap second occur and what is
-the current offset between TAI and UTC. It will periodically check if 23:59:59
+*chronyd* can use to determine when the next leap second occurs and what
+the current offset between TAI and UTC is. It will periodically check if 23:59:59
 and 23:59:60 are valid times in the timezone. This normally works with the
 _right/UTC_ timezone.
 +
 When a leap second is announced, the timezone needs to be updated at least 12
 hours before the leap second. It is not necessary to restart *chronyd*.
 +
-This directive is useful with reference clocks and other time sources which do
+This directive is useful with reference clocks and other time sources that do
 not announce leap seconds, or announce them too late for an NTP server to
 forward them to its own clients. Clients of leap smearing servers must not
 use this directive.
@@ -1263,8 +1336,21 @@ $ TZ=right/UTC date -d 'Dec 31 2008 23:59:60'
 Wed Dec 31 23:59:60 UTC 2008
 ----
 
+[[leapseclist]]*leapseclist* _file_::
+This directive specifies the path to a file containing a list of leap seconds
+and TAI-UTC offsets in NIST/IERS format. It is recommended to use
+the file _leap-seconds.list_ usually included with the system timezone
+database. The behaviour of this directive is otherwise equivalent to
+<<leapsectz,*leapsectz*>>.
++
+An example of this directive is:
++
+----
+leapseclist /usr/share/zoneinfo/leap-seconds.list
+----
+
 [[makestep]]*makestep* _threshold_ _limit_::
-Normally *chronyd* will cause the system to gradually correct any time offset,
+Normally *chronyd* will cause the system to gradually correct any time offset
 by slowing down or speeding up the clock as required. In certain situations,
 e.g. when *chronyd* is initially started, the system clock might be so far
 adrift that this slewing process would take a very long time to correct the
@@ -1286,6 +1372,9 @@ makestep 0.1 3
 +
 This would step the system clock if the adjustment is larger than 0.1 seconds, but
 only in the first three clock updates.
++
+Note that this directive does not work and should not be used when the system
+clock control is disabled by the *-x* option of *chronyd*.
 
 [[maxchange]]*maxchange* _offset_ _start_ _ignore_::
 This directive sets the maximum offset to be accepted on a clock update. The
@@ -1493,13 +1582,13 @@ allow all 1.2.0.0/16
 +
 In the first example, the effect is the same regardless of what order the three
 directives are given in. So the _1.2.0.0/16_ subnet is allowed access, except
-for the _1.2.3.0/24_ subnet, which is denied access, however the host _1.2.3.4_
+for the _1.2.3.0/24_ subnet, which is denied access, while the host _1.2.3.4_
 is allowed access.
 +
 In the second example, the *allow all 1.2.0.0/16* directive overrides the
 effect of _any_ previous directive relating to a subnet within the specified
 subnet. Within a configuration file this capability is probably rather moot;
-however, it is of greater use for reconfiguration at run-time via *chronyc*
+yet, it is of greater use for reconfiguration at run-time via *chronyc*
 with the <<chronyc.adoc#allow,*allow all*>> command.
 +
 The rules are internally represented as a tree of tables with one level per
@@ -1526,7 +1615,7 @@ This is similar to the <<allow,*allow*>> directive, except that it denies NTP
 and NTS-KE client access to a particular subnet or host, rather than allowing
 it.
 +
-The syntax is identical and the directive can be used multiple times too.
+The syntax is identical, and the directive can be used multiple times too.
 +
 There is also a *deny all* directive with similar behaviour to the *allow all*
 directive.
@@ -1544,7 +1633,7 @@ bindaddress 192.168.1.1
 ----
 +
 Currently, for each of the IPv4 and IPv6 protocols, only one *bindaddress*
-directive can be specified. Therefore, it is not useful on computers which
+directive can be specified. Therefore, it is not useful on computers that
 should serve NTP on multiple network interfaces.
 
 [[binddevice]]*binddevice* _interface_::
@@ -1638,16 +1727,19 @@ expected stratum in the network when external NTP servers are accessible.
 +
 Stratum 1 indicates a computer that has a true real-time reference directly
 connected to it (e.g. GPS, atomic clock, etc.), such computers are expected to
-be very close to real time. Stratum 2 computers are those which have a stratum
+be very close to real time. Stratum 2 computers are those that have a stratum
 1 server; stratum 3 computers have a stratum 2 server and so on. A value
 of 10 indicates that the clock is so many hops away from a reference clock that
 its time is fairly unreliable.
 *distance* _distance_:::
 This option sets the threshold for the root distance which will activate the local
-reference. If *chronyd* was synchronised to some source, the local reference
-will not be activated until its root distance reaches the specified value (the
-rate at which the distance is increasing depends on how well the clock was
-tracking the source). The default value is 1 second.
+reference. If *chronyd* was synchronised to a configured time source, the local
+reference will not be activated until its root distance reaches the specified
+value (the rate at which the distance is increasing depends on how well the
+clock was tracking the source). When the clock is not synchronised, it is
+considered to have an infinite root distance, i.e. the local reference
+activates as soon as allowed by the *waitunsynced* option. The default
+threshold is 1 second.
 +
 The current root distance can be calculated from root delay and root dispersion
 (reported by the <<chronyc.adoc#tracking,*tracking*>> command in *chronyc*) as:
@@ -1655,6 +1747,14 @@ The current root distance can be calculated from root delay and root dispersion
 ----
 distance = delay / 2 + dispersion
 ----
+*activate* _distance_:::
+This option sets an activating root distance for the local reference. The
+local reference will not be used until the root distance drops below the
+configured value for the first time. This can be used to prevent the local
+reference from being activated on a server which has never been synchronised
+with an upstream server. The default value of 0.0 causes no activating
+distance to be used, such that the local reference is always eligible for
+activation.
 *orphan*:::
 This option enables a special '`orphan`' mode, where sources with stratum equal
 to the local _stratum_ are assumed to not serve real time. They are ignored
@@ -1662,7 +1762,7 @@ unless no other source is selectable and their reference IDs are smaller than
 the local reference ID.
 +
 This allows multiple servers in the network to use the same *local*
-configuration and to be synchronised to one another, without confusing clients
+configuration and to be synchronised to one another without confusing clients
 that poll more than one server. Each server needs to be configured to poll all
 other servers with the *local* directive. This ensures only the server with the
 smallest reference ID has the local reference active and others are
@@ -1672,12 +1772,30 @@ smallest reference ID will take over when its local reference mode activates
 +
 The *orphan* mode is compatible with the *ntpd*'s orphan mode (enabled by the
 *tos orphan* command).
+*waitsynced* _interval_:::
+This option specifies the minimum interval (in seconds) between the last update
+of the clock and activation of the local reference as configured by the
+*distance* and *activate* options. The *distance* option can be set to 0 to
+ignore the root distance and control the activation only by the interval. In
+such case it should be at least as long as the maximum expected polling
+interval to prevent frequent activation in normal polling of the source.
+The default minimum interval is 0.
+*waitunsynced* _interval_:::
+This option specifies how long (in seconds) *chronyd* needs to wait before
+activating the local reference when the clock is not considered to be
+synchronised (e.g. after start or the source selection failing due to no
+majority). This delay prevents *chronyd* from serving incorrect time to clients
+before the configured time sources are given a chance to synchronise the local
+clock. The default interval is 300 seconds if the *orphan* option is set,
+otherwise it is 0 (i.e. local reference activates immediately).
 {blank}::
 +
-An example of the directive is:
+Examples of the directive are:
 +
 ----
-local stratum 10 orphan distance 0.1
+local stratum 5
+local stratum 10 orphan distance 0.1 activate 0.5
+local stratum 10 orphan distance 0.0 waitsynced 7200 waitunsynced 300
 ----
 
 [[ntpsigndsocket]]*ntpsigndsocket* _directory_::
@@ -1726,7 +1844,7 @@ the user under which *chronyd* is running after dropping root privileges. For
 security reasons, it should not be readable by other users.
 +
 This directive can be used multiple times to specify multiple keys. The number
-of keys must be the same as the number of certificates and the corresponding
+of keys must be the same as the number of certificates, and the corresponding
 files must be specified in the same order.
 
 [[ntsprocesses]]*ntsprocesses* _processes_::
@@ -1734,7 +1852,7 @@ This directive specifies how many helper processes will *chronyd* operating
 as an NTS server start for handling client NTS-KE requests in order to improve
 performance with multi-core CPUs and multithreading. If set to 0, no helper
 process will be started and all NTS-KE requests will be handled by the main
-*chronyd* process. The default value is 1.
+*chronyd* process. The default value is 1, and the maximum value is 1000.
 
 [[maxntsconnections]]*maxntsconnections* _connections_::
 This directive specifies the maximum number of concurrent NTS-KE connections
@@ -1742,6 +1860,43 @@ per process that the NTS server will accept. The default value is 100. The
 maximum practical value is half of the system *FD_SETSIZE* constant (usually
 1024).
 
+[[ntsaeads2]]*ntsaeads* _ID_...::
+This directive specifies a list of IDs of Authenticated Encryption with
+Associated Data (AEAD) algorithms enabled for NTS authentication of NTP
+messages. *chronyd* as a server uses the first enabled algorithm from the list
+provided by the client. Algorithms that are not supported by the installed
+version of the crypto library (Nettle, GnuTLS) are ignored.
++
+The following IDs are supported:
++
+* 15: AES-SIV-CMAC-256
+* 30: AES-128-GCM-SIV
+{blank}::
++
+The default list of IDs is _30 15_. AES-128-GCM-SIV is preferred over
+AES-SIV-CMAC-256 for shorter keys, which makes NTS cookies shorter and improves
+reliability of NTS in networks that block or limit rate of longer NTP messages.
++
+An example of the directive is:
++
+----
+ntsaeads 15
+----
++
+This list is used also by the <<ntsaeads1,NTS client>>.
++
+Note the the NTS specification (RFC 8915) requires servers to support
+AES-SIV-CMAC-256, i.e. 15 should always be included in the specified list.
++
+The AES-128-GCM-SIV keys used by *chronyd* do not comply to RFC 8915 for
+compatibility with older *chrony* clients unless the use of compliant keys is
+negotiated with an
+https://chrony-project.org/doc/spec/nts-compliant-128gcm.html[NTS-KE record].
+Support for this record was added in version 4.6.1. As a client, *chronyd* can
+interoperate with a server that uses compliant keys, but does not support the
+negotiation if it responds to incorrectly authenticated requests with an NTS
+NAK.
+
 [[ntsdumpdir2]]*ntsdumpdir* _directory_::
 This directive specifies a directory where *chronyd* operating as an NTS server
 can save the keys which encrypt NTS cookies provided to clients. The keys are
@@ -1759,9 +1914,9 @@ This directory is used also by the <<ntsdumpdir1,NTS client>> to save NTS cookie
 
 [[ntsntpserver]]*ntsntpserver* _hostname_::
 This directive specifies the hostname (as a fully qualified domain name) or
-address of the NTP server(s) which is
+address of the NTP server(s) that is
 provided in the NTS-KE response to the clients. It allows the NTS-KE server to
-be separated from the NTP server. However, the servers need to share the keys,
+be separated from the NTP server. The servers need to share the keys, however,
 i.e. external key management needs to be enabled by setting
 <<ntsrotate,*ntsrotate*>> to 0. By default, no hostname or address is provided
 to the clients, which means they should use the same server for NTS-KE and NTP.
@@ -1813,7 +1968,7 @@ addresses. If multiple clients share one IP address (e.g. multiple hosts behind
 NAT), the sum of their traffic will be limited. If a client that increases its
 polling rate when it does not receive a reply is detected, its rate limiting
 will be temporarily suspended to avoid increasing the overall amount of
-traffic. The maximum number of IP addresses which can be monitored at the same
+traffic. The maximum number of IP addresses that can be monitored at the same
 time depends on the memory limit set by the <<clientloglimit,*clientloglimit*>>
 directive.
 +
@@ -1831,7 +1986,7 @@ than the specified interval).
 This option sets the maximum number of responses that can be sent in a burst,
 temporarily exceeding the limit specified by the *interval* option. This is
 useful for clients that make rapid measurements on start (e.g. *chronyd* with
-the *iburst* option). The default value is 8. The minimum value is 1 and the
+the *iburst* option). The default value is 8. The minimum value is 1, and the
 maximum value is 255.
 *leak* _rate_:::
 This option sets the rate at which responses are randomly allowed even if the
@@ -1839,7 +1994,15 @@ limits specified by the *interval* and *burst* options are exceeded. This is
 necessary to prevent an attacker who is sending requests with a spoofed
 source address from completely blocking responses to that address. The leak
 rate is defined as a power of 1/2 and it is 2 by default, i.e. on average at
-least every fourth request has a response. The minimum value is 1 and the
+least every fourth request has a response. The minimum value is 1, and the
+maximum value is 4.
+*kod* _rate_:::
+This option sets the rate at which Kiss-o'-Death (KoD) RATE responses are
+randomly sent when the limits specified by the *interval* and *burst* options
+are exceeded. It is an additional stream of responses to the *leak* option. A
+KoD RATE response is a request for the client to reduce its polling rate. Few
+implementations actually support it. The rate is defined as a power of 1/2. The
+default value is 0, which means disabled. The minimum value is 0, and the
 maximum value is 4.
 {blank}::
 +
@@ -1856,7 +2019,7 @@ packets, by up to 75% (with default *leak* of 2).
 [[ntsratelimit]]*ntsratelimit* [_option_]...::
 This directive enables rate limiting of NTS-KE requests. It is similar to the
 <<ratelimit,*ratelimit*>> directive, except the default interval is 6
-(1 connection per 64 seconds).
+(1 connection per 64 seconds) and the *kod* option is not supported.
 +
 An example of the use of the directive is:
 +
@@ -1868,13 +2031,13 @@ ntsratelimit interval 3 burst 1
 The *smoothtime* directive can be used to enable smoothing of the time that
 *chronyd* serves to its clients to make it easier for them to track it and keep
 their clocks close together even when large offset or frequency corrections are
-applied to the server's clock, for example after being offline for a longer
+applied to the server's clock, for example, after being offline for a longer
 time.
 +
 BE WARNED: The server is intentionally not serving its best estimate of the
 true time. If a large offset has been accumulated, it can take a very long time
 to smooth it out. This directive should be used only when the clients are not
-configured to also poll another NTP server, because they could reject this
+configured to poll another NTP server also, because they could reject this
 server as a falseticker or fail to select a source completely.
 +
 The smoothing process is implemented with a quadratic spline function with two
@@ -1888,7 +2051,7 @@ reset*>> command.
 The first two arguments of the directive are the maximum frequency offset of
 the smoothed time to the tracked NTP time (in ppm) and the maximum rate at
 which the frequency offset is allowed to change (in ppm per second). *leaponly*
-is an optional third argument which enables a mode where only leap seconds are
+is an optional third argument that enables a mode where only leap seconds are
 smoothed out and normal offset and frequency changes are ignored. The *leaponly*
 option is useful in a combination with the <<leapsecmode,*leapsecmode slew*>>
 directive to allow the clients to use multiple time smoothing servers safely.
@@ -1972,6 +2135,9 @@ The syntax is identical to the *allow* directive.
 There is also a *cmdallow all* directive with similar behaviour to the *allow
 all* directive (but applying to monitoring access in this case, of course).
 +
+Addresses _127.0.0.1_ and _::1_ (i.e. the loopback interface) are always
+allowed.
++
 Note that *chronyd* has to be configured with the
 <<bindcmdaddress,*bindcmdaddress*>> directive to not listen only on the
 loopback interface to actually allow remote access.
@@ -2004,8 +2170,8 @@ 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
 similar to the <<ratelimit,*ratelimit*>> directive, except responses to
-localhost are never limited and the default interval is -4 (16 packets per
-second).
+localhost are never limited, the default interval is -4 (16 packets per
+second), and the *kod* option is not supported.
 +
 An example of the use of the directive is:
 +
@@ -2013,6 +2179,27 @@ An example of the use of the directive is:
 cmdratelimit interval 2
 ----
 
+[[opencommands]]*opencommands* [_command_]...::
+This directive specifies a list of monitoring commands to be enabled for the
+hosts allowed by the *cmdallow* directive. The following commands can be
+specified (the naming follows *chronyc*):
++
+*activity*+*+, *authdata*, *clients*, *manual*+*+, *ntpdata*, *rtcdata*+*+,
+*selectdata*, *serverstats*+*+, *smoothing*+*+, *sourcename*+*+, *sources*+*+,
+*sourcestats*, *tracking*+*+.
++
+The commands marked with +*+ are enabled by default. The protocol of these
+commands is considered stable and can be expected to work between different
+versions of *chronyc* and *chronyd*. The protocol of the other commands is not
+considered stable and different versions of *chronyc* and *chronyd* may not
+interoperate. When that happens, *chronyc* will print an '`Invalid command`' or
+'`Bad reply from daemon`' error.
++
+Note that some of the reported data can be potentially useful to attackers,
+enabling them to observe and predict better the internal state of *chronyd*.
+It is recommended to enable only commands that are actually needed for
+monitoring and limit the access to the hosts that need it.
+
 === Real-time clock (RTC)
 
 [[hwclockfile]]*hwclockfile* _file_::
@@ -2078,7 +2265,7 @@ option to *chronyd*) if the following three conditions apply:
 
 [[rtconutc]]*rtconutc*::
 *chronyd* assumes by default that the RTC keeps local time (including any
-daylight saving changes). This is convenient on PCs running Linux which are
+daylight saving changes). This is convenient on PCs running Linux that are
 dual-booted with Windows.
 +
 If you keep the RTC on local time and your computer is off when daylight saving
@@ -2093,7 +2280,8 @@ The directive takes no arguments. It is equivalent to specifying the *-u*
 switch to the Linux *hwclock* program.
 +
 Note that this setting is overridden by the <<hwclockfile,*hwclockfile*>> file
-and is not relevant for the <<rtcsync,*rtcsync*>> directive.
+and is not relevant for the <<rtcsync,*rtcsync*>> directive or when the RTC
+is used as reference clock.
 
 [[rtcsync]]*rtcsync*::
 The *rtcsync* directive enables a mode where the system time is periodically
@@ -2143,8 +2331,8 @@ from the example line above):
 . Results of the *maxdelay*, *maxdelayratio*, and *maxdelaydevratio* (or
   *maxdelayquant*) tests, and a test for synchronisation loop (1=pass,
   0=fail). The first test from these four also checks the server precision,
-  response time, and whether an interleaved response is acceptable for
-  synchronisation. [1111]
+  response time, validity of the measured offset, and whether an interleaved
+  response is acceptable for synchronisation. [1111]
 . Local poll [10]
 . Remote poll [10]
 . '`Score`' (an internal score within each polling level used to decide when to
@@ -2166,7 +2354,7 @@ from the example line above):
 +
 *measurements*:::
 This option is identical to the *rawmeasurements* option, except it logs only
-valid measurements from synchronised sources, i.e. measurements which passed
+valid measurements from synchronised sources, i.e. measurements that passed
 the RFC 5905 tests 1 through 7. This can be useful for producing graphs of the
 source's performance.
 +
@@ -2207,7 +2395,7 @@ from the example line above):
   used to prune old samples when it no longer looks like the measurements fit a
   linear model). [0, i.e. no samples discarded this time]
 . The number of runs. The number of runs of regression residuals with the same
-  sign is computed. If this is too small it indicates that the measurements are
+  sign is computed. If this is too small, it indicates that the measurements are
   no longer represented well by a linear model and that some older samples need
   to be discarded. The number of runs for the data that is being retained is
   tabulated. Values of approximately half the number of samples are expected.
@@ -2426,9 +2614,9 @@ log measurements statistics tracking
 A banner is periodically written to the log files enabled by the <<log,*log*>>
 directive to indicate the meanings of the columns.
 +
-The *logbanner* directive specifies after how many entries in the log file
-should be the banner written. The default is 32, and 0 can be used to disable
-it entirely.
+The *logbanner* directive specifies the cadence size of how many entries are
+written to the log file after which the banner is written anew. The default is
+32, and 0 can be used to disable it entirely.
 
 [[logchange]]*logchange* _threshold_::
 This directive sets the threshold for the adjustment of the system clock that
@@ -2518,7 +2706,7 @@ sourcedir /var/run/chrony-dhcp
 [[include]]*include* _pattern_::
 The *include* directive includes a configuration file, or multiple configuration
 files if a wildcard pattern is specified. Unlike with the *confdir* directive,
-the full name of the files needs to be specified and at least one file is
+the full name of the files needs to be specified, and at least one file is
 required to exist.
 +
 This directive can be used multiple times.
@@ -2604,8 +2792,8 @@ timestamp and the actual reception time at the physical layer. This value will
 be subtracted from receive timestamps obtained from the NIC. The default value
 is 0.
 *nocrossts*:::
-Some hardware can precisely cross timestamp the NIC clock with the system
-clock. This option disables the use of the cross timestamping.
+Some hardware can precisely cross-timestamp the NIC clock with the system
+clock. This option disables the use of the cross-timestamping.
 *rxfilter* _filter_:::
 This option selects the receive timestamping filter. The _filter_ can be one of
 the following:
@@ -2645,7 +2833,7 @@ 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
+configures how long *chronyd* should 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.
@@ -2660,7 +2848,7 @@ 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
+keys, which are shared between NTP servers and clients, or peers, in order to
 authenticate NTP packets with a message authentication code (MAC) using a
 cryptographic hash function or cipher.
 +
@@ -2687,7 +2875,7 @@ Each line consists of an ID, optional type, and key.
 +
 The ID can be any positive integer in the range 1 through 2^32-1.
 +
-The type is a name of a cryptographic hash function or cipher which is used to
+The type is a name of a cryptographic hash function or cipher that is used to
 generate and verify the MAC. The default type is *MD5*, which is always
 supported.
 If *chronyd* was built with enabled support for hashing using a crypto library
@@ -2711,7 +2899,11 @@ source is specified in the configuration file with a key shorter than 80 bits.
 +
 The recommended key types are AES ciphers and SHA3 hash functions. MD5 should
 be avoided unless no other type is supported on the server and client, or
-peers.
+peers. A major weakness of MD5 for the NTP MAC is a length extension attack,
+where a man-in-the-middle attacker can add arbitrary extension fields to the
+NTP message and update the MAC to pass the verification of the extended
+message. The *extfield* option (enabling processing of the specified extension
+field) should not be used for NTP sources authenticated with an MD5 key.
 +
 The <<chronyc.adoc#keygen,*keygen*>> command of *chronyc* can be used to
 generate random keys for the key file. By default, it generates 160-bit MD5 or
@@ -2736,11 +2928,13 @@ e.g.:
 ----
 pidfile /run/chronyd.pid
 ----
++
+Setting this directive to _/_ disables writing and checking of the PID file.
 
 [[ptpport]]*ptpport* _port_::
 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
+on NICs that cannot timestamp NTP packets, but can timestamp unicast PTP
 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
@@ -2753,7 +2947,7 @@ 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
+hardware timestamping on NICs that can timestamp PTP packets only, the
 *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.
@@ -2766,6 +2960,11 @@ hwtimestamp * rxfilter ptp
 ptpport 319
 ----
 
+[[ptpdomain]]*ptpdomain* _domain_::
+The *ptpdomain* directive sets the PTP domain number of transmitted and
+accepted NTP-over-PTP messages. Messages from other domains are ignored.
+The default is 123, the minimum is 0, and the maximum is 255.
+
 [[sched_priority]]*sched_priority* _priority_::
 On Linux, FreeBSD, NetBSD, and illumos, the *sched_priority* directive will
 select the SCHED_FIFO real-time scheduler at the specified priority (which must
@@ -2805,7 +3004,7 @@ The compiled-in default value is _@DEFAULT_USER@_.
 === NTP client with permanent connection to NTP servers
 
 This section shows how to configure *chronyd* for computers that are connected
-to the Internet (or to any network containing true NTP servers which ultimately
+to the Internet (or to any network containing true NTP servers that ultimately
 derive their time from a reference clock) permanently or most of the time.
 
 To operate in this mode, you will need to know the names of the NTP servers
@@ -2831,7 +3030,7 @@ server ntp2.example.net
 server ntp3.example.net
 ----
 
-However, you will probably want to include some of the other directives. The
+You will probably want to include some of the other directives, however. The
 <<driftfile,*driftfile*>>, <<makestep,*makestep*>> and <<rtcsync,*rtcsync*>>
 might be particularly useful. Also, the *iburst* option of the
 <<server,*server*>> directive is useful to speed up the initial
@@ -2920,7 +3119,7 @@ actually connected to the Internet.
 === Isolated networks
 
 This section shows how to configure *chronyd* for computers that never have
-network connectivity to any computer which ultimately derives its time from a
+network connectivity to any computer that ultimately derives its time from a
 reference clock.
 
 In this situation, one computer is selected to be the primary timeserver. The
@@ -2935,7 +3134,7 @@ in the form of the <<manual,*manual*>> directive and the
 <<chronyc.adoc#settime,*settime*>> command in the *chronyc* program.
 
 If the server is rebooted, *chronyd* can re-read the drift rate from the drift
-file. However, the server has no accurate estimate of the current time. To get
+file. The server has no accurate estimate of the current time, however. To get
 around this, the system can be configured so that the server can initially set
 itself to a '`majority-vote`' of selected clients' times; this allows the
 clients to '`flywheel`' the server while it is rebooting.
@@ -3003,7 +3202,7 @@ clients might be configured to poll all three servers.
 
 === RTC tracking
 
-This section considers a computer which has occasional connections to the
+This section considers a computer that has occasional connections to the
 Internet and is turned off between '`sessions`'. In this case, *chronyd* relies
 on the computer's RTC to maintain the time between the periods when it is
 powered up. It assumes that Linux is run exclusively on the computer. Dual-boot
@@ -3014,7 +3213,7 @@ enable the *HPET_EMULATE_RTC* option in your kernel configuration. Otherwise,
 using it.
 
 When the computer is connected to the Internet, *chronyd* has access to
-external NTP servers which it makes measurements from. These measurements are
+external NTP servers that it makes measurements from. These measurements are
 saved, and straight-line fits are performed on them to provide an estimate of
 the computer's time error and rate of gaining or losing time.
 
@@ -3057,7 +3256,7 @@ take *chronyd* offline; because *chronyd* free-runs between online sessions, no
 parameters will change significantly between going offline from the Internet
 and any power failure.
 
-A final point regards computers which are left running for extended periods and
+A final point regards computers that are left running for extended periods and
 where it is desired to spin down the hard disc when it is not in use (e.g. when
 not accessed for 15 minutes). *chronyd* has been planned so it supports such
 operation; this is the reason why the RTC tracking parameters are not saved to

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, 2019-2023
+// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2024
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
@@ -50,7 +50,7 @@ running under a non-root user), it will try to connect to 127.0.0.1 and then
 ::1.
 
 Only the following monitoring commands, which do not affect the behaviour of
-*chronyd*, are allowed from the network: *activity*, *manual list*,
+*chronyd*, are allowed from the network by default: *activity*, *manual list*,
 *rtcdata*, *smoothing*, *sourcename*, *sources*, *sourcestats*, *tracking*,
 *waitsync*. The
 set of hosts from which *chronyd* will accept these commands can be configured
@@ -58,7 +58,10 @@ with the <<chrony.conf.adoc#cmdallow,*cmdallow*>> directive in the *chronyd*'s
 configuration file or the <<cmdallow,*cmdallow*>> command in *chronyc*. By
 default, the commands are accepted only from localhost (127.0.0.1 or ::1).
 
-All other commands are allowed only through the Unix domain socket. When sent
+Other monitoring commands can be enabled for network access by the
+<<chrony.conf.adoc#opencommands,*opencommands*>> directive. Monitoring commands
+with disabled network access and commands that affect the behaviour of
+*chronyd* are allowed only through the Unix domain socket. If they are sent
 over the network, *chronyd* will respond with a '`Not authorised`' error, even
 if it is from localhost.
 
@@ -364,9 +367,12 @@ a measurement is being made every 64 seconds. *chronyd* automatically varies
 the polling rate in response to prevailing conditions.
 *Reach*:::
 This shows the source's 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 transmissions.
+register has 8 bits. It is shifted to left by one bit with each poll and it is
+updated by 1 when a valid NTP response, or just a sample in case of a reference
+clock, is received from the source. A value of 377 indicates that a valid
+response or sample was received for all of the last 8 polls. Note that samples
+can be dropped if they are not considered good enough for synchronisation, but
+the reachability register will still have 1s for their polls.
 *LastRx*:::
 This column shows how long ago the last good sample (which is shown in the next
 column) was received from the source. Measurements that failed some tests are
@@ -459,8 +465,8 @@ states are reported.
 The following states indicate the source is not considered selectable for
 synchronisation:
 * _N_ - has the *noselect* option.
-* _s_ - is not synchronised.
 * _M_ - does not have enough measurements.
+* _s_ - is not synchronised.
 * _d_ - has a root distance larger than the maximum distance (configured by the
         <<chrony.conf.adoc#maxdistance,*maxdistance*>> directive).
 * _~_ - has a jitter larger than the maximum jitter (configured by the
@@ -492,7 +498,7 @@ local clock:
 This column shows the name or IP address of the source if it is an NTP server,
 or the reference ID if it is a reference clock.
 *Auth*:::
-This column indicites whether an authentication mechanism is enabled for the
+This column indicates whether an authentication mechanism is enabled for the
 source. _Y_ means yes and _N_ means no.
 *COpts*:::
 This column displays the configured selection options of the source.
@@ -556,6 +562,13 @@ The *reselectdist* command sets the reselection distance. It is equivalent to
 the <<chrony.conf.adoc#reselectdist,*reselectdist*>> directive in the
 configuration file.
 
+[[offset]]*offset* _address|refid_ _offset_::
+The *offset* command modifies the offset correction 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. It is equivalent to
+the *offset* option in the <<chrony.conf.adoc#server,*server*>> or
+<<chrony.conf.adoc#refclock,*refclock*>> directive respectively.
+
 === NTP sources
 
 [[activity]]*activity*::
@@ -689,6 +702,10 @@ Total TX        : 24
 Total RX        : 24
 Total valid RX  : 24
 Total good RX   : 22
+Total kernel TX : 24
+Total kernel RX : 24
+Total HW TX     : 0
+Total HW RX     : 0
 ----
 +
 The fields are explained as follows:
@@ -746,6 +763,18 @@ The number of packets which passed the first two groups of NTP tests.
 *Total good RX*:::
 The number of packets which passed all three groups of NTP tests, i.e. the NTP
 measurement was accepted.
+*Total kernel TX*:::
+The number of packets sent to the source for which a timestamp was captured by
+the kernel.
+*Total kernel RX*:::
+The number of packets received from the source for which a timestamp was
+captured by the kernel.
+*Total HW TX*:::
+The number of packets sent to the source for which a timestamp was captured by
+the NIC.
+*Total HW RX*:::
+The number of packets received from the source for which a timestamp was
+captured by the NIC.
 
 [[add_peer]]*add peer* _name_ [_option_]...::
 The *add peer* command allows a new NTP peer to be added whilst
@@ -1438,6 +1467,13 @@ purged. An example of how to do this is shown below.
 # chronyc cyclelogs
 # rm /var/log/chrony/measurements1.log
 ----
++
+Note that log files enabled by the *log* directive are opened when the first
+entry is made. The message log file specified by the *chronyd*'s *-l* option is
+opened early on start and closed on the *cyclelogs* command only if opening of
+the new file succeeds to avoid losing messages. If *chronyd* is configured to
+drop root privileges and the directory containg the log file is not writable
+for the specified user, *chronyd* will not be able to open the file again.
 
 [[dump]]*dump*::
 The *dump* command causes *chronyd* to write its current history of

doc/chronyd.adoc

@@ -217,6 +217,14 @@ 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.
 
+*NOTIFY_SOCKET*::
+The systemd service manager sets this variable for services of the *notify*
+type. *chronyd* sends a message to this socket when it it is fully initialised
+and ready to accept commands (e.g. from *chronyc*), with the clock already set
+if using the *-s* option or *initstepslew* directive. It is an alternative to
+the *forking* service type, which does not need the PID file. *chronyd* needs
+to be started with the *-n* or *-d* option to not fork.
+
 == FILES
 
 _@SYSCONFDIR@/chrony.conf_

doc/contributing.adoc

@@ -0,0 +1,74 @@
+// This file is part of chrony
+//
+// Copyright (C) Miroslav Lichvar  2024
+//
+// 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.
+
+= Contributing
+
+== Patches
+
+The source code of `chrony` is maintained in a git repository at
+https://gitlab.com/chrony/chrony. Patches can be submitted to the `chrony-dev`
+mailing list, or as a merge request on gitlab. Before spending a lot of time
+implementing a new major feature, it is recommended to ask on the mailing list
+for comments about its design and whether such feature fits the goals of the
+project.
+
+Each commit should be a self-contained logical change, which does not break
+the build or tests. New functionality and fixed bugs should be covered by a new
+test or an extended existing test in the test suite. The test can be included
+in the same commit or added as a separate commit. The same rule applies to
+documentation. All command-line options, configuration directives, and
+`chronyc` commands should be documented.
+
+The most important tests can be executed by running `make check` or `make
+quickcheck`. The unit and system tests run on all supported systems. The system
+tests require root privileges. The simulation tests run only on Linux and
+require https://gitlab.com/chrony/clknetsim[clknetsim] to be compiled in the
+directory containing the tests, but they are executed with a merge request on
+gitlab.
+
+The commit message should explain any non-trivial changes, e.g. what problem is
+the commit solving and how. The commit subject (first line of the message)
+should be written in an imperative form, prefixed with the component name if it
+is not a more general change, starting in lower case, and no period at the end.
+See the git log for examples.
+
+Simpler code is better. Less code is better. Security is a top priority.
+
+Assertions should catch only bugs in the `chrony` code. Unexpected values in
+external input (e.g. anything received from network) must be handled correctly
+without crashing and memory corruption. Fuzzing support is available at
+https://gitlab.com/chrony/chrony-fuzz. The fuzzing coverage is checked by the
+project maintainer before each release.
+
+The code should mostly be self-documenting. Comments should explain the
+less obvious things.
+
+== Coding style
+
+The code uses two spaces for indentation. No tabs. The line length should
+normally not exceed 95 characters. Too much indentation indicates the code will
+not be very readable.
+
+Function names are in an imperative form. Names of static functions use
+lowercase characters and underscores. Public functions, structures, typedefs
+are in CamelCase with a prefix specific to the module (e.g. LCL - local, NCR
+- NTP core, NKS - NTS-KE server, SST - sourcestats).
+
+Function names are not followed by space, but keywords of the language (e.g.
+`if`, `for`, `while`, `sizeof`) are followed by space.
+
+Have a look at the existing code to get a better idea what is expected.

doc/faq.adoc

@@ -2,7 +2,7 @@
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Luke Valenta  2023
-// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2023
+// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2024
 //
 // 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
@@ -772,6 +772,17 @@ print all sources, even those that do not have a known address yet, with their
 names as they were specified in the configuration. This can be useful to verify
 that the names specified in the configuration are used as expected.
 
+When DNSSEC is enabled, it will not work until the time is synchronized, as it
+requires validating a signature timestamp and its expiration date, so if the
+system time is too far in the future or the past DNSSEC validation will fail and
+`chronyd` will be unable to resolve the address of the NTP server. In such cases,
+if hostnames are the only options and bare IP addresses cannot be used, DNSSEC
+can be disabled for `chronyd` using resolver-specific mechanisms, if available,
+although of course that means losing the protection afforded by DNSSEC.
+For example, when using systemd-resolved, the `SYSTEMD_NSS_RESOLVE_VALIDATE=0`
+environment variable can be set, for example in the `chronyd` systemd unit via
+`Environment=SYSTEMD_NSS_RESOLVE_VALIDATE=0`.
+
 === Is `chronyd` allowed to step the system clock?
 
 By default, `chronyd` adjusts the clock gradually by slowing it down or
@@ -1155,6 +1166,53 @@ There are several different clocks used by `chronyd`:
   synchronised by `chronyd`. Its offset is tracked relative to the NTP clock in
   order to convert the hardware timestamps.
 
+=== How accurate is my system clock?
+
+`chronyd` does not know how accurate really is the clock it is synchronizing.
+Even if the measured offset of the clock is stable to nanoseconds, it could be
+off by milliseconds due to asymmetric network delay, e.g. caused by asymmetric
+routing or queuing delays in network switches. NTP provides root delay and root
+dispersion to enable clients to estimate the maximum error of their clock.
+
+Root delay measures the sum of round-trip times between all NTP servers on the
+path from the client to the primary time source (e.g. a GPS receiver). Half of
+the root delay is the maximum error due to asymmetric delays, assuming one
+direction (e.g. from the client to the server) has a zero delay and the other
+direction (from the server to the client) takes all of the measured delay. The
+root delay also covers timestamping errors if the server implementation and
+hardware meet the NTP requirement for transmit timestamps to never be late and
+receive timestamps to never be early.
+
+If you have additional information about the hardware and network between the
+client and primary time source, you could modify the root delay to get a better
+estimate of the maximum error. For example, from the physical distance of the
+server and signal propagation speed in the cables a minimum symmetric
+round-trip delay can be calculated and subtracted from the root delay measured
+by NTP.
+
+Root dispersion estimates errors due to instability of clocks and NTP
+measurements. `chronyd` adjusts the rate at which root dispersion grows between
+updates of the clock according to the stability of its NTP measurements. The
+minimum rate is set by the the `maxclockerror` directive. By default it is 1
+ppm (1 microsecond per second).
+
+The estimated maximum error of the NTP clock is the sum of the root dispersion
+and half of the root delay. This value is called root distance. The current
+values of root dispersion and delay are included in the `tracking` report.
+
+The estimated maximum error of the system clock, which is synchronized to the
+NTP clock, is the sum of the root distance and remaining correction of the
+system clock provided as `System time` in the `tracking` report. A maximum
+value of this estimate between updates of the clock is included in the
+`tracking` log.
+
+Note that the resolution of the root delay and root dispersion fields in NTP
+messages is about 15 microseconds and `chronyd` rounds the values up, i.e. the
+minimum root distance an NTP client can normally observe is about 22.5
+microseconds. An NTP extension field containing root delay and dispersion in a
+better resolution of about 4 nanoseconds can be enabled by the `extfield F323`
+option.
+
 == Operating systems
 
 === Does `chrony` support Windows?

doc/installation.adoc

@@ -85,13 +85,6 @@ will be built with support for dropping root privileges. On other systems no
 extra library is needed. The default user which `chronyd` should run as can be
 specified with the `--with-user` option of the `configure` script.
 
-If development files for the POSIX threads library are available, `chronyd`
-will be built with support for asynchronous resolving of hostnames specified in
-the `server`, `peer`, and `pool` directives. This allows `chronyd` operating as
-a server to respond to client requests when resolving a hostname. If you don't
-want to enable the support, specify the `--disable-asyncdns` flag to
-`configure`.
-
 If development files for the https://www.lysator.liu.se/~nisse/nettle/[Nettle],
 https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS[NSS], or
 https://www.libtom.net/LibTomCrypt/[libtomcrypt] library are available,

examples/chrony.conf.example2

@@ -37,8 +37,8 @@ ntsdumpdir /var/lib/chrony
 # Insert/delete leap seconds by slewing instead of stepping.
 #leapsecmode slew
 
-# Get TAI-UTC offset and leap seconds from the system tz database.
-#leapsectz right/UTC
+# Set the TAI-UTC offset of the system clock.
+#leapseclist /usr/share/zoneinfo/leap-seconds.list
 
 # Specify directory for log files.
 logdir /var/log/chrony

examples/chrony.conf.example3

@@ -126,11 +126,11 @@ ntsdumpdir /var/lib/chrony
 
 ! pidfile /var/run/chrony/chronyd.pid
 
-# If the system timezone database is kept up to date and includes the
-# right/UTC timezone, chronyd can use it to determine the current
-# TAI-UTC offset and when will the next leap second occur.
+# The system timezone database usually comes with a list of leap seconds and
+# corresponding TAI-UTC offsets.  chronyd can use it to set the offset of the
+# system TAI clock and have an additional source of leap seconds.
 
-! leapsectz right/UTC
+! leapseclist /usr/share/zoneinfo/leap-seconds.list
 
 #######################################################################
 ### INITIAL CLOCK CORRECTION

examples/chronyd-restricted.service

@@ -12,10 +12,11 @@ Conflicts=chronyd.service ntpd.service systemd-timesyncd.service
 ConditionCapability=CAP_SYS_TIME
 
 [Service]
-Type=forking
+Type=notify
 PIDFile=/run/chrony/chronyd.pid
+Environment="OPTIONS="
 EnvironmentFile=-/etc/sysconfig/chronyd
-ExecStart=/usr/sbin/chronyd -U $OPTIONS
+ExecStart=/usr/sbin/chronyd -n -U $OPTIONS
 
 User=chrony
 LogsDirectory=chrony

examples/chronyd.service

@@ -6,10 +6,11 @@ Conflicts=ntpd.service systemd-timesyncd.service
 ConditionCapability=CAP_SYS_TIME
 
 [Service]
-Type=forking
+Type=notify
 PIDFile=/run/chrony/chronyd.pid
+Environment="OPTIONS="
 EnvironmentFile=-/etc/sysconfig/chronyd
-ExecStart=/usr/sbin/chronyd $OPTIONS
+ExecStart=/usr/sbin/chronyd -n $OPTIONS
 
 CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
 CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_KILL CAP_LEASE CAP_LINUX_IMMUTABLE

getdate.y

@@ -907,6 +907,7 @@ get_date (const char *p, const time_t *now)
   yyHour = tmp->tm_hour;
   yyMinutes = tmp->tm_min;
   yySeconds = tmp->tm_sec;
+  memset(&tm, 0, sizeof (tm));
   tm.tm_isdst = tmp->tm_isdst;
   yyMeridian = MER24;
   yyRelSeconds = 0;

hwclock.c

@@ -49,6 +49,7 @@
 #define DELAY_QUANT_MAX_K 2
 #define DELAY_QUANT_Q 10
 #define DELAY_QUANT_REPEAT 7
+#define DELAY_QUANT_LARGE_STEP_DELAY 1000
 #define DELAY_QUANT_MIN_STEP 1.0e-9
 
 struct HCL_Instance_Record {
@@ -127,6 +128,7 @@ HCL_CreateInstance(int min_samples, int max_samples, double min_separation, doub
   clock->precision = precision;
   clock->delay_quants = QNT_CreateInstance(DELAY_QUANT_MIN_K, DELAY_QUANT_MAX_K,
                                            DELAY_QUANT_Q, DELAY_QUANT_REPEAT,
+                                           DELAY_QUANT_LARGE_STEP_DELAY,
                                            DELAY_QUANT_MIN_STEP);
 
   LCL_AddParameterChangeHandler(handle_slew, clock);
@@ -199,8 +201,10 @@ HCL_ProcessReadings(HCL_Instance clock, int n_readings, struct timespec tss[][3]
 
   local_prec = LCL_GetSysPrecisionAsQuantum();
 
-  low_delay = QNT_GetQuantile(clock->delay_quants, DELAY_QUANT_MIN_K);
-  high_delay = QNT_GetQuantile(clock->delay_quants, DELAY_QUANT_MAX_K);
+  low_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMinK(clock->delay_quants)) -
+              QNT_GetMinStep(clock->delay_quants) / 2.0;
+  high_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMaxK(clock->delay_quants)) +
+               QNT_GetMinStep(clock->delay_quants) / 2.0;
   low_delay = MIN(low_delay, high_delay);
   high_delay = MAX(high_delay, low_delay + local_prec);
 

keys.c

@@ -405,7 +405,7 @@ check_auth(Key *key, const void *data, int data_len,
 
   hash_len = generate_auth(key, data, data_len, buf, sizeof (buf));
 
-  return MIN(hash_len, trunc_len) == auth_len && !memcmp(buf, auth, auth_len);
+  return MIN(hash_len, trunc_len) == auth_len && UTI_IsMemoryEqual(buf, auth, auth_len);
 }
 
 /* ================================================== */

leapdb.c

@@ -0,0 +1,272 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2009-2018, 2020, 2022
+ * Copyright (C) Patrick Oppenlander 2023, 2024
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  This module provides leap second information. */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "conf.h"
+#include "leapdb.h"
+#include "logging.h"
+#include "util.h"
+
+/* ================================================== */
+
+/* Source of leap second data */
+enum {
+  SRC_NONE,
+  SRC_TIMEZONE,
+  SRC_LIST,
+} leap_src;
+
+/* Offset between leap-seconds.list timestamp epoch and Unix epoch.
+   leap-seconds.list epoch is 1 Jan 1900, 00:00:00 */
+#define LEAP_SEC_LIST_OFFSET 2208988800
+
+/* ================================================== */
+
+static NTP_Leap
+get_tz_leap(time_t when, int *tai_offset)
+{
+  struct tm stm, *tm;
+  time_t t;
+  char *tz_env, tz_orig[128];
+  NTP_Leap tz_leap = LEAP_Normal;
+
+  tm = gmtime(&when);
+  if (!tm)
+    return tz_leap;
+
+  stm = *tm;
+
+  /* Temporarily switch to the timezone containing leap seconds */
+  tz_env = getenv("TZ");
+  if (tz_env) {
+    if (strlen(tz_env) >= sizeof (tz_orig))
+      return tz_leap;
+    strcpy(tz_orig, tz_env);
+  }
+  setenv("TZ", CNF_GetLeapSecTimezone(), 1);
+  tzset();
+
+  /* Get the TAI-UTC offset, which started at the epoch at 10 seconds */
+  t = mktime(&stm);
+  if (t != -1)
+    *tai_offset = t - when + 10;
+
+  /* Set the time to 23:59:60 and see how it overflows in mktime() */
+  stm.tm_sec = 60;
+  stm.tm_min = 59;
+  stm.tm_hour = 23;
+
+  t = mktime(&stm);
+
+  if (tz_env)
+    setenv("TZ", tz_orig, 1);
+  else
+    unsetenv("TZ");
+  tzset();
+
+  if (t == -1)
+    return tz_leap;
+
+  if (stm.tm_sec == 60)
+    tz_leap = LEAP_InsertSecond;
+  else if (stm.tm_sec == 1)
+    tz_leap = LEAP_DeleteSecond;
+
+  return tz_leap;
+}
+
+/* ================================================== */
+
+static NTP_Leap
+get_list_leap(time_t when, int *tai_offset)
+{
+  FILE *f;
+  char line[1024];
+  NTP_Leap ret_leap = LEAP_Normal;
+  int ret_tai_offset = 0, prev_lsl_tai_offset = 10;
+  int64_t when1900, lsl_updated = 0, lsl_expiry = 0;
+  const char *leap_sec_list = CNF_GetLeapSecList();
+
+  if (!(f = UTI_OpenFile(NULL, leap_sec_list, NULL, 'r', 0))) {
+    LOG(LOGS_ERR, "Failed to open leap seconds list %s", leap_sec_list);
+    goto out;
+  }
+
+  /* Leap second happens at midnight */
+  when = (when / (24 * 3600) + 1) * (24 * 3600);
+
+  /* leap-seconds.list timestamps are relative to 1 Jan 1900, 00:00:00 */
+  when1900 = (int64_t)when + LEAP_SEC_LIST_OFFSET;
+
+  while (fgets(line, sizeof line, f) > 0) {
+    int64_t lsl_when;
+    int lsl_tai_offset;
+    char *p;
+
+    /* Ignore blank lines */
+    for (p = line; *p && isspace(*p); ++p)
+      ;
+    if (!*p)
+      continue;
+
+    if (*line == '#') {
+      /* Update time line starts with #$ */
+      if (line[1] == '$' && sscanf(line + 2, "%"SCNd64, &lsl_updated) != 1)
+        goto error;
+      /* Expiration time line starts with #@ */
+      if (line[1] == '@' && sscanf(line + 2, "%"SCNd64, &lsl_expiry) != 1)
+        goto error;
+      /* Comment or a special comment we don't care about */
+      continue;
+    }
+
+    /* Leap entry */
+    if (sscanf(line, "%"SCNd64" %d", &lsl_when, &lsl_tai_offset) != 2)
+      goto error;
+
+    if (when1900 == lsl_when) {
+      if (lsl_tai_offset > prev_lsl_tai_offset)
+        ret_leap = LEAP_InsertSecond;
+      else if (lsl_tai_offset < prev_lsl_tai_offset)
+        ret_leap = LEAP_DeleteSecond;
+      /* When is rounded to the end of the day, so offset hasn't changed yet! */
+      ret_tai_offset = prev_lsl_tai_offset;
+    } else if (when1900 > lsl_when) {
+      ret_tai_offset = lsl_tai_offset;
+    }
+
+    prev_lsl_tai_offset = lsl_tai_offset;
+  }
+
+  /* Make sure the file looks sensible */
+  if (!feof(f) || !lsl_updated || !lsl_expiry)
+    goto error;
+
+  if (when1900 >= lsl_expiry)
+    LOG(LOGS_WARN, "Leap second list %s needs update", leap_sec_list);
+
+  goto out;
+
+error:
+  if (f)
+    fclose(f);
+  LOG(LOGS_ERR, "Failed to parse leap seconds list %s", leap_sec_list);
+  return LEAP_Normal;
+
+out:
+  if (f)
+    fclose(f);
+  *tai_offset = ret_tai_offset;
+  return ret_leap;
+}
+
+/* ================================================== */
+
+static int
+check_leap_source(NTP_Leap (*src)(time_t when, int *tai_offset))
+{
+  int tai_offset = 0;
+
+  /* Check that the leap second source has good data for Jun 30 2012 and Dec 31 2012 */
+  if (src(1341014400, &tai_offset) == LEAP_InsertSecond && tai_offset == 34 &&
+      src(1356912000, &tai_offset) == LEAP_Normal && tai_offset == 35)
+    return 1;
+
+  return 0;
+}
+
+/* ================================================== */
+
+void
+LDB_Initialise(void)
+{
+  const char *leap_tzname, *leap_sec_list;
+
+  leap_tzname = CNF_GetLeapSecTimezone();
+  if (leap_tzname && !check_leap_source(get_tz_leap)) {
+    LOG(LOGS_WARN, "Timezone %s failed leap second check, ignoring", leap_tzname);
+    leap_tzname = NULL;
+  }
+
+  leap_sec_list = CNF_GetLeapSecList();
+  if (leap_sec_list && !check_leap_source(get_list_leap)) {
+    LOG(LOGS_WARN, "Leap second list %s failed check, ignoring", leap_sec_list);
+    leap_sec_list = NULL;
+  }
+
+  if (leap_sec_list) {
+    LOG(LOGS_INFO, "Using leap second list %s", leap_sec_list);
+    leap_src = SRC_LIST;
+  } else if (leap_tzname) {
+    LOG(LOGS_INFO, "Using %s timezone to obtain leap second data", leap_tzname);
+    leap_src = SRC_TIMEZONE;
+  }
+}
+
+/* ================================================== */
+
+NTP_Leap
+LDB_GetLeap(time_t when, int *tai_offset)
+{
+  static time_t last_ldb_leap_check;
+  static NTP_Leap ldb_leap;
+  static int ldb_tai_offset;
+
+  /* Do this check at most twice a day */
+  when = when / (12 * 3600) * (12 * 3600);
+  if (last_ldb_leap_check == when)
+    goto out;
+
+  last_ldb_leap_check = when;
+  ldb_leap = LEAP_Normal;
+  ldb_tai_offset = 0;
+
+  switch (leap_src) {
+  case SRC_NONE:
+    break;
+  case SRC_TIMEZONE:
+    ldb_leap = get_tz_leap(when, &ldb_tai_offset);
+    break;
+  case SRC_LIST:
+    ldb_leap = get_list_leap(when, &ldb_tai_offset);
+    break;
+  }
+
+out:
+  *tai_offset = ldb_tai_offset;
+  return ldb_leap;
+}
+
+/* ================================================== */
+
+void
+LDB_Finalise(void)
+{
+  /* Nothing to do */
+}

leapdb.h

@@ -0,0 +1,37 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Patrick Oppenlander 2024
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  This module provides leap second information.
+
+  */
+
+#ifndef GOT_LEAPDB_H
+#define GOT_LEAPDB_H
+
+#include "ntp.h"
+
+extern void LDB_Initialise(void);
+extern NTP_Leap LDB_GetLeap(time_t when, int *tai_offset);
+extern void LDB_Finalise(void);
+
+#endif /* GOT_LEAPDB_H */

local.c

@@ -184,10 +184,8 @@ void
 LCL_Finalise(void)
 {
   /* Make sure all handlers have been removed */
-  if (change_list.next != &change_list)
-    assert(0);
-  if (dispersion_notify_list.next != &dispersion_notify_list)
-    assert(0);
+  BRIEF_ASSERT(change_list.next == &change_list);
+  BRIEF_ASSERT(dispersion_notify_list.next == &dispersion_notify_list);
 }
 
 /* ================================================== */
@@ -225,9 +223,7 @@ LCL_AddParameterChangeHandler(LCL_ParameterChangeHandler handler, void *anything
 
   /* Check that the handler is not already registered */
   for (ptr = change_list.next; ptr != &change_list; ptr = ptr->next) {
-    if (!(ptr->handler != handler || ptr->anything != anything)) {
-      assert(0);
-    }
+    BRIEF_ASSERT(ptr->handler != handler || ptr->anything != anything);
   }
 
   new_entry = MallocNew(ChangeListEntry);
@@ -301,9 +297,7 @@ LCL_AddDispersionNotifyHandler(LCL_DispersionNotifyHandler handler, void *anythi
 
   /* Check that the handler is not already registered */
   for (ptr = dispersion_notify_list.next; ptr != &dispersion_notify_list; ptr = ptr->next) {
-    if (!(ptr->handler != handler || ptr->anything != anything)) {
-      assert(0);
-    }
+    BRIEF_ASSERT(ptr->handler != handler || ptr->anything != anything);
   }
 
   new_entry = MallocNew(DispersionNotifyListEntry);
@@ -701,8 +695,11 @@ LCL_MakeStep(void)
 
   /* Cancel remaining slew and make the step */
   LCL_AccumulateOffset(correction, 0.0);
-  if (!LCL_ApplyStepOffset(-correction))
+  if (!LCL_ApplyStepOffset(-correction)) {
+    /* Revert the correction */
+    LCL_AccumulateOffset(-correction, 0.0);
     return 0;
+  }
 
   LOG(LOGS_WARN, "System clock was stepped by %.6f seconds", correction);
 

logging.c

@@ -46,6 +46,7 @@ static LOG_Context log_contexts;
 /* Flag indicating we have initialised */
 static int initialised = 0;
 
+static char *file_log_path = NULL;
 static FILE *file_log = NULL;
 static int system_log = 0;
 
@@ -92,6 +93,9 @@ LOG_Finalise(void)
 
   if (file_log)
     fclose(file_log);
+  file_log = NULL;
+  Free(file_log_path);
+  file_log_path = NULL;
 
   LOG_CycleLogFiles();
 
@@ -185,7 +189,7 @@ void LOG_Message(LOG_Severity severity,
       /* Send the message also to the foreground process if it is
          still running, or stderr if it is still open */
       if (parent_fd > 0) {
-        if (write(parent_fd, buf, strlen(buf) + 1) < 0)
+        if (!LOG_NotifyParent(buf))
           ; /* Not much we can do here */
       } else if (system_log && parent_fd == 0) {
         system_log = 0;
@@ -200,27 +204,42 @@ void LOG_Message(LOG_Severity severity,
 
 /* ================================================== */
 
-void
-LOG_OpenFileLog(const char *log_file)
+static FILE *
+open_file_log(const char *log_file, char mode)
 {
   FILE *f;
 
   if (log_file) {
-    f = UTI_OpenFile(NULL, log_file, NULL, 'A', 0640);
+    f = UTI_OpenFile(NULL, log_file, NULL, mode, 0640);
   } else {
     f = stderr;
   }
 
   /* Enable line buffering */
-  setvbuf(f, NULL, _IOLBF, BUFSIZ);
+  if (f)
+    setvbuf(f, NULL, _IOLBF, BUFSIZ);
+
+  return f;
+}
+
+/* ================================================== */
+
+void
+LOG_OpenFileLog(const char *log_file)
+{
+  if (file_log_path)
+    Free(file_log_path);
+  if (log_file)
+    file_log_path = Strdup(log_file);
+  else
+    file_log_path = NULL;
 
   if (file_log && file_log != stderr)
     fclose(file_log);
 
-  file_log = f;
+  file_log = open_file_log(file_log_path, 'A');
 }
 
-
 /* ================================================== */
 
 void
@@ -291,6 +310,17 @@ LOG_SetParentFd(int fd)
 
 /* ================================================== */
 
+int
+LOG_NotifyParent(const char *message)
+{
+  if (parent_fd <= 0)
+    return 1;
+
+  return write(parent_fd, message, strlen(message) + 1) > 0;
+}
+
+/* ================================================== */
+
 void
 LOG_CloseParentFd()
 {
@@ -374,14 +404,29 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
 void
 LOG_CycleLogFiles(void)
 {
+  struct stat st;
   LOG_FileID i;
+  FILE *f;
 
+  /* The log will be opened later when an entry is logged */
   for (i = 0; i < n_filelogs; i++) {
     if (logfiles[i].file)
       fclose(logfiles[i].file);
     logfiles[i].file = NULL;
     logfiles[i].writes = 0;
   }
+
+  /* Try to open the log specified by the -l option, but only if nothing is
+     present at its path to avoid unnecessary error messages.  Keep the
+     original file if that fails (the process might no longer have the
+     necessary privileges to write in the directory). */
+  if (file_log && file_log != stderr && stat(file_log_path, &st) < 0 && errno == ENOENT) {
+    f = open_file_log(file_log_path, 'a');
+    if (f) {
+      fclose(file_log);
+      file_log = f;
+    }
+  }
 }
 
 /* ================================================== */

logging.h

@@ -126,7 +126,10 @@ extern void LOG_OpenSystemLog(void);
 /* Stop using stderr and send fatal message to the foreground process */
 extern void LOG_SetParentFd(int fd);
 
-/* Close the pipe to the foreground process so it can exit */
+/* Send a message to the foreground process */
+extern int LOG_NotifyParent(const char *message);
+
+/* Close the pipe to the foreground process */
 extern void LOG_CloseParentFd(void);
 
 /* File logging functions */

main.c

@@ -32,6 +32,7 @@
 
 #include "main.h"
 #include "sched.h"
+#include "leapdb.h"
 #include "local.h"
 #include "sys.h"
 #include "ntp_io.h"
@@ -106,11 +107,40 @@ delete_pidfile(void)
 
 /* ================================================== */
 
+static void
+notify_system_manager(int start)
+{
+#ifdef LINUX
+  /* The systemd protocol is documented in the sd_notify(3) man page */
+  const char *message, *path = getenv("NOTIFY_SOCKET");
+  int sock_fd;
+
+  if (!path)
+    return;
+
+  if (path[0] != '/')
+    LOG_FATAL("Unsupported notification socket");
+
+  message = start ? "READY=1" : "STOPPING=1";
+
+  sock_fd = SCK_OpenUnixDatagramSocket(path, NULL, 0);
+
+  if (sock_fd < 0 || SCK_Send(sock_fd, message, strlen(message), 0) != strlen(message))
+    LOG_FATAL("Could not send notification");
+
+  SCK_CloseSocket(sock_fd);
+#endif
+}
+
+/* ================================================== */
+
 void
 MAI_CleanupAndExit(void)
 {
   if (!initialised) exit(exit_status);
   
+  notify_system_manager(0);
+
   LCL_CancelOffsetCorrection();
   SRC_DumpSources();
 
@@ -134,6 +164,7 @@ MAI_CleanupAndExit(void)
   RCL_Finalise();
   SRC_Finalise();
   REF_Finalise();
+  LDB_Finalise();
   RTC_Finalise();
   SYS_Finalise();
 
@@ -213,7 +244,12 @@ post_init_ntp_hook(void *anything)
     REF_SetMode(ref_mode);
   }
 
-  /* Close the pipe to the foreground process so it can exit */
+  notify_system_manager(1);
+
+  /* Send an empty message to the foreground process so it can exit.
+     If that fails, indicating the process was killed, exit too. */
+  if (!LOG_NotifyParent(""))
+    SCH_QuitProgram();
   LOG_CloseParentFd();
 
   CNF_AddSources();
@@ -334,10 +370,13 @@ go_daemon(void)
     /* Don't exit before the 'parent' */
     waitpid(pid, NULL, 0);
 
-    close(pipefd[1]);
     r = read(pipefd[0], message, sizeof (message));
-    if (r) {
-      if (r > 0) {
+
+    close(pipefd[0]);
+    close(pipefd[1]);
+
+    if (r != 1 || message[0] != '\0') {
+      if (r > 1) {
         /* Print the error message from the child */
         message[sizeof (message) - 1] = '\0';
         fprintf(stderr, "%s\n", message);
@@ -346,8 +385,6 @@ go_daemon(void)
     } else
       exit(0);
   } else {
-    close(pipefd[0]);
-
     setsid();
 
     /* Do 2nd fork, as-per recommended practice for launching daemons. */
@@ -357,6 +394,7 @@ go_daemon(void)
       LOG_FATAL("fork() failed : %s", strerror(errno));
     } else if (pid > 0) {
       /* In the 'parent' */
+      close(pipefd[0]);
       close(pipefd[1]);
       exit(0);
     } else {
@@ -655,6 +693,7 @@ int main
   if (!geteuid())
     LOG(LOGS_WARN, "Running with root privileges");
 
+  LDB_Initialise();
   REF_Initialise();
   SST_Initialise();
   NSR_Initialise();

ntp_core.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2023
+ * Copyright (C) Miroslav Lichvar  2009-2024
  * 
  * 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
@@ -221,7 +221,7 @@ struct NCR_Instance_Record {
   int burst_good_samples_to_go;
   int burst_total_samples_to_go;
 
-  /* Report from last valid response */
+  /* Report from last valid response and packet/timestamp statistics */
   RPT_NTPReport report;
 };
 
@@ -286,6 +286,7 @@ static ARR_Instance broadcasts;
 
 /* Parameters for the peer delay quantile */
 #define DELAY_QUANT_Q 100
+#define DELAY_QUANT_LARGE_STEP_DELAY 100
 #define DELAY_QUANT_REPEAT 7
 
 /* Minimum and maximum allowed poll interval */
@@ -690,6 +691,7 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   if (params->max_delay_quant > 0.0) {
     int k = round(CLAMP(0.05, params->max_delay_quant, 0.95) * DELAY_QUANT_Q);
     result->delay_quant = QNT_CreateInstance(k, k, DELAY_QUANT_Q, DELAY_QUANT_REPEAT,
+                                             DELAY_QUANT_LARGE_STEP_DELAY,
                                              LCL_GetSysPrecisionAsQuantum() / 2.0);
   } else {
     result->delay_quant = NULL;
@@ -1742,7 +1744,7 @@ check_delay_quant(NCR_Instance inst, double delay)
 
   quant = QNT_GetQuantile(inst->delay_quant, QNT_GetMinK(inst->delay_quant));
 
-  if (delay <= quant)
+  if (delay <= quant + QNT_GetMinStep(inst->delay_quant) / 2.0)
     return 1;
 
   DEBUG_LOG("maxdelayquant: delay=%e quant=%e", delay, quant);
@@ -2211,7 +2213,8 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
     /* 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
+       response in the 'warm up' exchange, the configured offset correction is
+       within the supported NTP interval, 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
@@ -2220,6 +2223,7 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
     testA = sample.peer_delay - sample.peer_dispersion <= inst->max_delay &&
             precision <= inst->max_delay &&
             inst->presend_done <= 0 &&
+            UTI_IsTimeOffsetSane(&sample.time, sample.offset) &&
             !(inst->mode == MODE_CLIENT && response_time > MAX_SERVER_INTERVAL) &&
             !(inst->mode == MODE_CLIENT && interleaved_packet &&
               UTI_IsZeroTimespec(&inst->prev_local_tx.ts) &&
@@ -2333,9 +2337,8 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
     inst->valid_rx = 1;
   }
 
-  if ((unsigned int)local_receive.source >= sizeof (tss_chars) ||
-      (unsigned int)local_transmit.source >= sizeof (tss_chars))
-    assert(0);
+  BRIEF_ASSERT((unsigned int)local_receive.source < sizeof (tss_chars) &&
+               (unsigned int)local_transmit.source < sizeof (tss_chars));
 
   DEBUG_LOG("NTP packet lvm=%o stratum=%d poll=%d prec=%d root_delay=%.9f root_disp=%.9f refid=%"PRIx32" [%s]",
             message->lvm, message->stratum, message->poll, message->precision,
@@ -2372,13 +2375,17 @@ process_response(NCR_Instance inst, int saved, NTP_Local_Address *local_addr,
 
     SRC_UpdateReachability(inst->source, synced_packet);
 
-    if (synced_packet) {
-      if (inst->copy && inst->remote_stratum > 0) {
-        /* Assume the reference ID and stratum of the server */
+    if (inst->copy) {
+      /* Assume the reference ID and stratum of the server */
+      if (synced_packet && inst->remote_stratum > 0) {
         inst->remote_stratum--;
         SRC_SetRefid(inst->source, ntohl(message->reference_id), &inst->remote_addr.ip_addr);
+      } else {
+        SRC_ResetInstance(inst->source);
       }
+    }
 
+    if (synced_packet) {
       SRC_UpdateStatus(inst->source, MAX(inst->remote_stratum, inst->min_stratum), pkt_leap);
 
       if (inst->delay_quant)
@@ -2530,6 +2537,10 @@ NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
   NTP_PacketInfo info;
 
   inst->report.total_rx_count++;
+  if (rx_ts->source == NTP_TS_KERNEL)
+    inst->report.total_kernel_rx_ts++;
+  else if (rx_ts->source == NTP_TS_HARDWARE)
+    inst->report.total_hw_rx_ts++;
 
   if (!parse_packet(message, length, &info))
     return 0;
@@ -2652,6 +2663,7 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
   NTP_Local_Timestamp local_tx, *tx_ts;
   NTP_int64 ntp_rx, *local_ntp_rx;
   int log_index, interleaved, poll, version;
+  CLG_Limit limit;
   uint32_t kod;
 
   /* Ignore the packet if it wasn't received by server socket */
@@ -2697,7 +2709,8 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
   log_index = CLG_LogServiceAccess(CLG_NTP, &remote_addr->ip_addr, &rx_ts->ts);
 
   /* Don't reply to all requests if the rate is excessive */
-  if (log_index >= 0 && CLG_LimitServiceRate(CLG_NTP, log_index)) {
+  limit = log_index >= 0 ? CLG_LimitServiceRate(CLG_NTP, log_index) : CLG_PASS;
+  if (limit == CLG_DROP) {
       DEBUG_LOG("NTP packet discarded to limit response rate");
       return;
   }
@@ -2711,6 +2724,13 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
       return;
   }
 
+  if (limit == CLG_KOD) {
+    /* Don't respond if there is a conflict with the NTS NAK */
+    if (kod != 0)
+      return;
+    kod = KOD_RATE;
+  }
+
   local_ntp_rx = NULL;
   tx_ts = NULL;
   interleaved = 0;
@@ -2736,7 +2756,7 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
       CLG_DisableNtpTimestamps(&ntp_rx);
   }
 
-  CLG_UpdateNtpStats(kod != 0 && info.auth.mode != NTP_AUTH_NONE &&
+  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);
 
@@ -2812,8 +2832,11 @@ NCR_ProcessTxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
                       message);
 
   if (tx_ts->source == NTP_TS_HARDWARE) {
+    inst->report.total_hw_tx_ts++;
     if (has_saved_response(inst))
       process_saved_response(inst);
+  } else if (tx_ts->source == NTP_TS_KERNEL) {
+    inst->report.total_kernel_tx_ts++;
   }
 }
 
@@ -3017,6 +3040,16 @@ NCR_ModifyMinstratum(NCR_Instance inst, int new_min_stratum)
 
 /* ================================================== */
 
+void
+NCR_ModifyOffset(NCR_Instance inst, double new_offset)
+{
+  inst->offset_correction = new_offset;
+  LOG(LOGS_INFO, "Source %s new offset %f",
+      UTI_IPToString(&inst->remote_addr.ip_addr), new_offset);
+}
+
+/* ================================================== */
+
 void
 NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target)
 {

ntp_core.h

@@ -113,6 +113,8 @@ extern void NCR_ModifyMaxdelaydevratio(NCR_Instance inst, double new_max_delay_d
 
 extern void NCR_ModifyMinstratum(NCR_Instance inst, int new_min_stratum);
 
+extern void NCR_ModifyOffset(NCR_Instance inst, double new_offset);
+
 extern void NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target);
 
 extern void NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_samples);

ntp_io.c

@@ -513,9 +513,11 @@ NIO_UnwrapMessage(SCK_Message *message, int sock_fd, double *net_correction)
 
   msg = message->data;
 
-  if (msg->header.type != PTP_TYPE_DELAY_REQ || msg->header.version != PTP_VERSION ||
+  if ((msg->header.type != PTP_TYPE_DELAY_REQ && msg->header.type != PTP_TYPE_SYNC) ||
+      (msg->header.version != PTP_VERSION_2 &&
+       (msg->header.version != PTP_VERSION_2_1 || msg->header.min_sdoid != 0)) ||
       ntohs(msg->header.length) != message->length ||
-      msg->header.domain != PTP_DOMAIN_NTP ||
+      msg->header.domain != CNF_GetPtpDomain() ||
       ntohs(msg->header.flags) != PTP_FLAG_UNICAST ||
       ntohs(msg->tlv_header.type) != PTP_TLV_NTP ||
       ntohs(msg->tlv_header.length) != message->length - PTP_NTP_PREFIX_LENGTH) {
@@ -561,9 +563,9 @@ wrap_message(SCK_Message *message, int sock_fd)
 
   memset(ptp_message, 0, PTP_NTP_PREFIX_LENGTH);
   ptp_message->header.type = PTP_TYPE_DELAY_REQ;
-  ptp_message->header.version = PTP_VERSION;
+  ptp_message->header.version = PTP_VERSION_2;
   ptp_message->header.length = htons(PTP_NTP_PREFIX_LENGTH + message->length);
-  ptp_message->header.domain = PTP_DOMAIN_NTP;
+  ptp_message->header.domain = CNF_GetPtpDomain();
   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);

ntp_io_linux.c

@@ -220,7 +220,7 @@ add_interface(CNF_HwTsInterface *conf_iface)
 
   SCK_CloseSocket(sock_fd);
 
-  phc_fd = SYS_Linux_OpenPHC(NULL, ts_info.phc_index);
+  phc_fd = SYS_Linux_OpenPHC(req.ifr_name);
   if (phc_fd < 0)
     return 0;
 

ntp_signd.c

@@ -99,6 +99,9 @@ static int sock_fd;
 /* Flag indicating if the MS-SNTP authentication is enabled */
 static int enabled;
 
+/* Flag limiting logging of connection error messages */
+static int logged_connection_error;
+
 /* ================================================== */
 
 static void read_write_socket(int sock_fd, int event, void *anything);
@@ -134,6 +137,14 @@ open_socket(void)
   sock_fd = SCK_OpenUnixStreamSocket(path, NULL, 0);
   if (sock_fd < 0) {
     sock_fd = INVALID_SOCK_FD;
+
+    /* Log an error only once before a successful exchange to avoid
+       flooding the system log */
+    if (!logged_connection_error) {
+      LOG(LOGS_ERR, "Could not connect to signd socket %s : %s", path, strerror(errno));
+      logged_connection_error = 1;
+    }
+
     return 0;
   }
 
@@ -160,6 +171,8 @@ process_response(SignInstance *inst)
     return;
   }
 
+  logged_connection_error = 0;
+
   /* Check if the file descriptor is still valid */
   if (!NIO_IsServerSocket(inst->local_addr.sock_fd)) {
     DEBUG_LOG("Invalid NTP socket");

ntp_sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2023
+ * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2024
  * 
  * 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
@@ -61,6 +61,8 @@ typedef struct {
                                    (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 family;                   /* IP family of acceptable resolved addresses
+                                   (IPADDR_UNSPEC if any) */
   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
@@ -98,6 +100,8 @@ struct UnresolvedSource {
   int pool_id;
   /* Name to be resolved */
   char *name;
+  /* Address family to filter resolved addresses */
+  int family;
   /* Flag indicating addresses should be used in a random order */
   int random_order;
   /* Flag indicating current address should be replaced only if it is
@@ -215,8 +219,14 @@ NSR_Finalise(void)
   ARR_DestroyInstance(pools);
 
   SCH_RemoveTimeout(resolving_id);
-  while (unresolved_sources)
-    remove_unresolved_source(unresolved_sources);
+
+  /* Leave the unresolved sources allocated if the async resolver is running
+     to avoid reading the name from freed memory.  The handler will not be
+     called as the scheduler should no longer be running at this point. */
+  if (!resolving_source) {
+    while (unresolved_sources)
+      remove_unresolved_source(unresolved_sources);
+  }
 
   initialised = 0;
 }
@@ -353,7 +363,7 @@ log_source(SourceRecord *record, int addition, int once_per_pool)
 
 /* Procedure to add a new source */
 static NSR_Status
-add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
+add_source(NTP_Remote_Address *remote_addr, char *name, int family, NTP_Source_Type type,
            SourceParameters *params, int pool_id, uint32_t conf_id)
 {
   SourceRecord *record;
@@ -391,6 +401,7 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
       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->family = family;
       record->pool_id = pool_id;
       record->tentative = 1;
       record->conf_id = conf_id;
@@ -446,9 +457,8 @@ change_source_address(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr
   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)
-    assert(0);
+  BRIEF_ASSERT(record->remote_addr == NCR_GetRemoteAddress(record->data) &&
+               UTI_CompareIPs(&record->remote_addr->ip_addr, &new_addr->ip_addr, NULL) == 0);
 
   if (!UTI_IsIPReal(&old_addr->ip_addr) && UTI_IsIPReal(&new_addr->ip_addr)) {
     if (auto_start_sources)
@@ -552,6 +562,10 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
 
     DEBUG_LOG("(%d) %s", i + 1, UTI_IPToString(&new_addr.ip_addr));
 
+    /* Skip addresses not from the requested family */
+    if (us->family != IPADDR_UNSPEC && us->family != new_addr.ip_addr.family)
+      continue;
+
     if (us->pool_id != INVALID_POOL) {
       /* In the pool resolving mode, try to replace a source from
          the pool which does not have a real address yet */
@@ -629,13 +643,16 @@ name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *any
   next = us->next;
 
   /* Don't repeat the resolving if it (permanently) failed, it was a
-     replacement of a real address, or all addresses are already resolved */
-  if (status == DNS_Failure || UTI_IsIPReal(&us->address.ip_addr) || is_resolved(us))
+     replacement of a real address, a refreshment, or all addresses are
+     already resolved */
+  if (status == DNS_Failure || UTI_IsIPReal(&us->address.ip_addr) ||
+      us->refreshment || is_resolved(us))
     remove_unresolved_source(us);
 
   /* If a restart was requested and this was the last source in the list,
      start with the first source again (if there still is one) */
   if (!next && resolving_restart) {
+    DEBUG_LOG("Restarting");
     next = unresolved_sources;
     resolving_restart = 0;
   }
@@ -700,11 +717,15 @@ static void
 append_unresolved_source(struct UnresolvedSource *us)
 {
   struct UnresolvedSource **i;
+  int n;
 
-  for (i = &unresolved_sources; *i; i = &(*i)->next)
+  for (i = &unresolved_sources, n = 0; *i; i = &(*i)->next, n++)
     ;
   *i = us;
   us->next = NULL;
+
+  DEBUG_LOG("Added unresolved source #%d pool_id=%d random=%d refresh=%d",
+            n + 1, us->pool_id, us->random_order, us->refreshment);
 }
 
 /* ================================================== */
@@ -754,8 +775,19 @@ static int get_unused_pool_id(void)
 static uint32_t
 get_next_conf_id(uint32_t *conf_id)
 {
+  SourceRecord *record;
+  unsigned int i;
+
+again:
   last_conf_id++;
 
+  /* Make sure the ID is not already used (after 32-bit wraparound) */
+  for (i = 0; i < ARR_GetSize(records); i++) {
+    record = get_record(i);
+    if (record->remote_addr && record->conf_id == last_conf_id)
+      goto again;
+  }
+
   if (conf_id)
     *conf_id = last_conf_id;
 
@@ -768,14 +800,14 @@ NSR_Status
 NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
               SourceParameters *params, uint32_t *conf_id)
 {
-  return add_source(remote_addr, NULL, type, params, INVALID_POOL,
+  return add_source(remote_addr, NULL, IPADDR_UNSPEC, type, params, INVALID_POOL,
                     get_next_conf_id(conf_id));
 }
 
 /* ================================================== */
 
 NSR_Status
-NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
+NSR_AddSourceByName(char *name, int family, int port, int pool, NTP_Source_Type type,
                     SourceParameters *params, uint32_t *conf_id)
 {
   struct UnresolvedSource *us;
@@ -787,7 +819,9 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
   /* If the name is an IP address, add the source with the address directly */
   if (UTI_StringToIP(name, &remote_addr.ip_addr)) {
     remote_addr.port = port;
-    return add_source(&remote_addr, name, type, params, INVALID_POOL,
+    if (family != IPADDR_UNSPEC && family != remote_addr.ip_addr.family)
+      return NSR_InvalidAF;
+    return add_source(&remote_addr, name, IPADDR_UNSPEC, type, params, INVALID_POOL,
                       get_next_conf_id(conf_id));
   }
 
@@ -799,6 +833,7 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
 
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(name);
+  us->family = family;
   us->random_order = 0;
   us->refreshment = 0;
 
@@ -835,7 +870,7 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
   for (i = 0; i < new_sources; i++) {
     if (i > 0)
       remote_addr.ip_addr.addr.id = ++last_address_id;
-    if (add_source(&remote_addr, name, type, params, us->pool_id, cid) != NSR_Success)
+    if (add_source(&remote_addr, name, family, type, params, us->pool_id, cid) != NSR_Success)
       return NSR_TooManySources;
   }
 
@@ -1026,6 +1061,7 @@ resolve_source_replacement(SourceRecord *record, int refreshment)
 
   us = MallocNew(struct UnresolvedSource);
   us->name = Strdup(record->name);
+  us->family = record->family;
   /* 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
@@ -1036,7 +1072,10 @@ resolve_source_replacement(SourceRecord *record, int refreshment)
   us->address = *record->remote_addr;
 
   append_unresolved_source(us);
-  NSR_ResolveSources();
+
+  /* Don't restart resolving round if already running */
+  if (!resolving_source)
+    NSR_ResolveSources();
 }
 
 /* ================================================== */
@@ -1431,6 +1470,20 @@ NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum)
 
 /* ================================================== */
 
+int
+NSR_ModifyOffset(IPAddr *address, double new_offset)
+{
+  int slot;
+
+  if (!find_slot(address, &slot))
+    return 0;
+
+  NCR_ModifyOffset(get_record(slot)->data, new_offset);
+  return 1;
+}
+
+/* ================================================== */
+
 int
 NSR_ModifyPolltarget(IPAddr *address, int new_poll_target)
 {

ntp_sources.h

@@ -55,9 +55,12 @@ extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type
 
 /* Procedure to add a new server, peer source, or pool of servers specified by
    name instead of address.  The name is resolved in exponentially increasing
-   intervals until it succeeds or fails with a non-temporary error.  If the
-   name is an address, it is equivalent to NSR_AddSource(). */
-extern NSR_Status NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
+   intervals until it succeeds or fails with a non-temporary error.  The
+   specified family filters resolved addresses.  If the name is an address
+   and its family does not conflict with the specified family, it is equivalent
+   to NSR_AddSource(). */
+extern NSR_Status NSR_AddSourceByName(char *name, int family, int port, int pool,
+                                      NTP_Source_Type type,
                                       SourceParameters *params, uint32_t *conf_id);
 
 extern const char *NSR_StatusToString(NSR_Status status);
@@ -137,6 +140,8 @@ extern int NSR_ModifyMaxdelaydevratio(IPAddr *address, double new_max_delay_rati
 
 extern int NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum);
 
+extern int NSR_ModifyOffset(IPAddr *address, double new_offset);
+
 extern int NSR_ModifyPolltarget(IPAddr *address, int new_poll_target);
 
 extern int NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples, IPAddr *mask, IPAddr *address);

nts_ke.h

@@ -40,6 +40,7 @@
 #define NKE_RECORD_COOKIE               5
 #define NKE_RECORD_NTPV4_SERVER_NEGOTIATION 6
 #define NKE_RECORD_NTPV4_PORT_NEGOTIATION 7
+#define NKE_RECORD_COMPLIANT_128GCM_EXPORT 1024
 
 #define NKE_NEXT_PROTOCOL_NTPV4         0
 
@@ -49,8 +50,6 @@
 
 #define NKE_ALPN_NAME                   "ntske/1"
 #define NKE_EXPORTER_LABEL              "EXPORTER-network-time-security"
-#define NKE_EXPORTER_CONTEXT_C2S        "\x0\x0\x0\xf\x0"
-#define NKE_EXPORTER_CONTEXT_S2C        "\x0\x0\x0\xf\x1"
 
 #define NKE_MAX_MESSAGE_LENGTH          16384
 #define NKE_MAX_RECORD_BODY_LENGTH      256

nts_ke_client.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020-2021
+ * Copyright (C) Miroslav Lichvar  2020-2021, 2024
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -50,7 +50,9 @@ struct NKC_Instance_Record {
   int got_response;
   int resolving_name;
 
+  int compliant_128gcm;
   NKE_Context context;
+  NKE_Context alt_context;
   NKE_Cookie cookies[NKE_MAX_COOKIES];
   int num_cookies;
   char server_name[NKE_MAX_RECORD_BODY_LENGTH + 2];
@@ -98,12 +100,14 @@ name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *arg
 
 /* ================================================== */
 
+#define MAX_AEAD_ALGORITHMS 4
+
 static int
 prepare_request(NKC_Instance inst)
 {
   NKSN_Instance session = inst->session;
-  uint16_t data[2];
-  int length;
+  uint16_t data[MAX_AEAD_ALGORITHMS];
+  int i, aead_algorithm, length;
 
   NKSN_BeginMessage(session);
 
@@ -111,15 +115,24 @@ prepare_request(NKC_Instance inst)
   if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, data, sizeof (data[0])))
     return 0;
 
-  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);
+  for (i = length = 0; i < ARR_GetSize(CNF_GetNtsAeads()) && length < MAX_AEAD_ALGORITHMS;
+       i++) {
+    aead_algorithm = *(int *)ARR_GetElement(CNF_GetNtsAeads(), i);
+    if (SIV_GetKeyLength(aead_algorithm) > 0)
+      data[length++] = htons(aead_algorithm);
+  }
   if (!NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, data,
                       length * sizeof (data[0])))
     return 0;
 
+  for (i = 0; i < length; i++) {
+    if (data[i] == htons(AEAD_AES_128_GCM_SIV)) {
+      if (!NKSN_AddRecord(session, 0, NKE_RECORD_COMPLIANT_128GCM_EXPORT, NULL, 0))
+        return 0;
+      break;
+    }
+  }
+
   if (!NKSN_EndMessage(session))
     return 0;
 
@@ -139,6 +152,8 @@ process_response(NKC_Instance inst)
   assert(sizeof (data) % sizeof (uint16_t) == 0);
   assert(sizeof (uint16_t) == 2);
 
+  inst->compliant_128gcm = 0;
+  inst->alt_context.algorithm = AEAD_SIV_INVALID;
   inst->num_cookies = 0;
   inst->ntp_address.ip_addr.family = IPADDR_UNSPEC;
   inst->ntp_address.port = 0;
@@ -165,15 +180,31 @@ 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 &&
-                            ntohs(data[0]) != AEAD_AES_128_GCM_SIV) ||
-            SIV_GetKeyLength(ntohs(data[0])) <= 0) {
-          DEBUG_LOG("Unexpected NTS-KE AEAD algorithm");
+        if (length != 2) {
+          DEBUG_LOG("Unexpected AEAD algorithm");
           error = 1;
           break;
         }
-        aead_algorithm = ntohs(data[0]);
-        inst->context.algorithm = aead_algorithm;
+        for (i = 0; i < ARR_GetSize(CNF_GetNtsAeads()); i++) {
+          if (ntohs(data[0]) == *(int *)ARR_GetElement(CNF_GetNtsAeads(), i) &&
+              SIV_GetKeyLength(ntohs(data[0])) > 0) {
+            aead_algorithm = ntohs(data[0]);
+            inst->context.algorithm = aead_algorithm;
+          }
+        }
+        if (aead_algorithm < 0) {
+          DEBUG_LOG("Unexpected AEAD algorithm");
+          error = 1;
+        }
+        break;
+      case NKE_RECORD_COMPLIANT_128GCM_EXPORT:
+        if (length != 0) {
+          DEBUG_LOG("Non-empty compliant-128gcm record");
+          error = 1;
+          break;
+        }
+        DEBUG_LOG("Compliant AES-128-GCM-SIV export");
+        inst->compliant_128gcm = 1;
         break;
       case NKE_RECORD_ERROR:
         if (length == 2)
@@ -255,6 +286,7 @@ process_response(NKC_Instance inst)
 static int
 handle_message(void *arg)
 {
+  SIV_Algorithm exporter_algorithm;
   NKC_Instance inst = arg;
 
   if (!process_response(inst)) {
@@ -262,8 +294,25 @@ handle_message(void *arg)
     return 0;
   }
 
-  if (!NKSN_GetKeys(inst->session, inst->context.algorithm,
-                    &inst->context.c2s, &inst->context.s2c))
+  exporter_algorithm = inst->context.algorithm;
+
+  /* With AES-128-GCM-SIV, set the algorithm ID in the RFC5705 key exporter
+     context incorrectly for compatibility with older chrony servers unless
+     the server confirmed support for the compliant context.  Generate both
+     sets of keys in case the server uses the compliant context, but does not
+     support the negotiation record, assuming it will respond with an NTS NAK
+     to a request authenticated with the noncompliant key. */
+  if (exporter_algorithm == AEAD_AES_128_GCM_SIV && !inst->compliant_128gcm) {
+    inst->alt_context.algorithm = inst->context.algorithm;
+    if (!NKSN_GetKeys(inst->session, inst->alt_context.algorithm, exporter_algorithm,
+                      NKE_NEXT_PROTOCOL_NTPV4, &inst->alt_context.c2s, &inst->alt_context.s2c))
+      return 0;
+
+    exporter_algorithm = AEAD_AES_SIV_CMAC_256;
+  }
+
+  if (!NKSN_GetKeys(inst->session, inst->context.algorithm, exporter_algorithm,
+                    NKE_NEXT_PROTOCOL_NTPV4, &inst->context.c2s, &inst->context.s2c))
     return 0;
 
   if (inst->server_name[0] != '\0') {
@@ -428,7 +477,7 @@ NKC_IsActive(NKC_Instance inst)
 /* ================================================== */
 
 int
-NKC_GetNtsData(NKC_Instance inst, NKE_Context *context,
+NKC_GetNtsData(NKC_Instance inst, NKE_Context *context, NKE_Context *alt_context,
                NKE_Cookie *cookies, int *num_cookies, int max_cookies,
                IPSockAddr *ntp_address)
 {
@@ -438,6 +487,7 @@ NKC_GetNtsData(NKC_Instance inst, NKE_Context *context,
     return 0;
 
   *context = inst->context;
+  *alt_context = inst->alt_context;
 
   for (i = 0; i < inst->num_cookies && i < max_cookies; i++)
     cookies[i] = inst->cookies[i];

nts_ke_client.h

@@ -46,7 +46,7 @@ extern int NKC_Start(NKC_Instance inst);
 extern int NKC_IsActive(NKC_Instance inst);
 
 /* Get the NTS data if the session was successful */
-extern int NKC_GetNtsData(NKC_Instance inst, NKE_Context *context,
+extern int NKC_GetNtsData(NKC_Instance inst, NKE_Context *context, NKE_Context *alt_context,
                           NKE_Cookie *cookies, int *num_cookies, int max_cookies,
                           IPSockAddr *ntp_address);
 

nts_ke_server.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020, 2022
+ * Copyright (C) Miroslav Lichvar  2020, 2022, 2024
  * 
  * 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
@@ -242,7 +242,7 @@ accept_connection(int listening_fd, int event, void *arg)
   SCH_GetLastEventTime(&now, NULL, NULL);
 
   log_index = CLG_LogServiceAccess(CLG_NTSKE, &addr.ip_addr, &now);
-  if (log_index >= 0 && CLG_LimitServiceRate(CLG_NTSKE, log_index)) {
+  if (log_index >= 0 && CLG_LimitServiceRate(CLG_NTSKE, log_index) != CLG_PASS) {
     DEBUG_LOG("Rejected connection from %s (%s)",
               UTI_IPSockAddrToString(&addr), "rate limit");
     SCK_CloseSocket(sock_fd);
@@ -337,8 +337,10 @@ helper_signal(int x)
 /* ================================================== */
 
 static int
-prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_algorithm)
+prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_algorithm,
+                 int compliant_128gcm)
 {
+  SIV_Algorithm exporter_algorithm;
   NKE_Context context;
   NKE_Cookie cookie;
   char *ntp_server;
@@ -371,6 +373,11 @@ prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_a
     if (!NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, &datum, sizeof (datum)))
       return 0;
 
+    if (aead_algorithm == AEAD_AES_128_GCM_SIV && compliant_128gcm) {
+      if (!NKSN_AddRecord(session, 0, NKE_RECORD_COMPLIANT_128GCM_EXPORT, NULL, 0))
+        return 0;
+    }
+
     if (CNF_GetNTPPort() != NTP_PORT) {
       datum = htons(CNF_GetNTPPort());
       if (!NKSN_AddRecord(session, 1, NKE_RECORD_NTPV4_PORT_NEGOTIATION, &datum, sizeof (datum)))
@@ -385,8 +392,16 @@ prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_a
     }
 
     context.algorithm = aead_algorithm;
+    exporter_algorithm = aead_algorithm;
 
-    if (!NKSN_GetKeys(session, aead_algorithm, &context.c2s, &context.s2c))
+    /* With AES-128-GCM-SIV, set the algorithm ID in the RFC5705 key exporter
+       context incorrectly for compatibility with older chrony clients unless
+       the client requested the compliant context */
+    if (exporter_algorithm == AEAD_AES_128_GCM_SIV && !compliant_128gcm)
+      exporter_algorithm = AEAD_AES_SIV_CMAC_256;
+
+    if (!NKSN_GetKeys(session, aead_algorithm, exporter_algorithm,
+                      NKE_NEXT_PROTOCOL_NTPV4, &context.c2s, &context.s2c))
       return 0;
 
     for (i = 0; i < NKE_MAX_COOKIES; i++) {
@@ -411,7 +426,8 @@ process_request(NKSN_Instance session)
   int next_protocol_records = 0, aead_algorithm_records = 0;
   int next_protocol_values = 0, aead_algorithm_values = 0;
   int next_protocol = -1, aead_algorithm = -1, error = -1;
-  int i, critical, type, length;
+  int i, j, critical, type, length;
+  int compliant_128gcm = 0;
   uint16_t data[NKE_MAX_RECORD_BODY_LENGTH / sizeof (uint16_t)];
 
   assert(NKE_MAX_RECORD_BODY_LENGTH % sizeof (uint16_t) == 0);
@@ -446,11 +462,21 @@ process_request(NKSN_Instance session)
 
         for (i = 0; i < MIN(length, sizeof (data)) / 2; i++) {
           aead_algorithm_values++;
-          /* Use the first supported algorithm */
-          if (aead_algorithm < 0 && SIV_GetKeyLength(ntohs(data[i])) > 0)
-            aead_algorithm = ntohs(data[i]);
+          /* Use the first enabled and supported algorithm */
+          for (j = 0; j < ARR_GetSize(CNF_GetNtsAeads()); j++) {
+            if (ntohs(data[i]) == *(int *)ARR_GetElement(CNF_GetNtsAeads(), j) &&
+                aead_algorithm < 0 && SIV_GetKeyLength(ntohs(data[i])) > 0)
+              aead_algorithm = ntohs(data[i]);
+          }
         }
         break;
+      case NKE_RECORD_COMPLIANT_128GCM_EXPORT:
+        if (length != 0) {
+          error = NKE_ERROR_BAD_REQUEST;
+          break;
+        }
+        compliant_128gcm = 1;
+        break;
       case NKE_RECORD_ERROR:
       case NKE_RECORD_WARNING:
       case NKE_RECORD_COOKIE:
@@ -469,7 +495,7 @@ process_request(NKSN_Instance session)
       error = NKE_ERROR_BAD_REQUEST;
   }
 
-  if (!prepare_response(session, error, next_protocol, aead_algorithm))
+  if (!prepare_response(session, error, next_protocol, aead_algorithm, compliant_128gcm))
     return 0;
 
   return 1;
@@ -494,8 +520,7 @@ generate_key(int index)
   ServerKey *key;
   int key_length;
 
-  if (index < 0 || index >= MAX_SERVER_KEYS)
-    assert(0);
+  BRIEF_ASSERT(index >= 0 && index < MAX_SERVER_KEYS);
 
   /* Prefer AES-128-GCM-SIV if available.  Note that if older keys loaded
      from ntsdumpdir use a different algorithm, responding to NTP requests
@@ -508,11 +533,11 @@ generate_key(int index)
   key = &server_keys[index];
 
   key_length = SIV_GetKeyLength(algorithm);
-  if (key_length > sizeof (key->key))
-    assert(0);
+  BRIEF_ASSERT(key_length <= sizeof (key->key));
 
   UTI_GetRandomBytesUrandom(key->key, key_length);
-  memset(key->key + key_length, 0, sizeof (key->key) - key_length);
+  if (key_length < sizeof (key->key))
+    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 */
@@ -676,7 +701,7 @@ key_timeout(void *arg)
 /* ================================================== */
 
 static void
-run_helper(uid_t uid, gid_t gid, int scfilter_level)
+run_helper(uid_t uid, gid_t gid, int scfilter_level, int sock_fd)
 {
   LOG_Severity log_severity;
 
@@ -703,10 +728,15 @@ run_helper(uid_t uid, gid_t gid, int scfilter_level)
   if (scfilter_level != 0)
     SYS_EnableSystemCallFilter(scfilter_level, SYS_NTSKE_HELPER);
 
+  SCH_AddFileHandler(sock_fd, SCH_FILE_INPUT, handle_helper_request, NULL);
+
   SCH_MainLoop();
 
   DEBUG_LOG("Helper exiting");
 
+  SCH_RemoveFileHandler(sock_fd);
+  close(sock_fd);
+
   NKS_Finalise();
   SCK_Finalise();
   SYS_Finalise();
@@ -766,9 +796,8 @@ NKS_PreInitialise(uid_t uid, gid_t gid, int scfilter_level)
     LOG_CloseParentFd();
 
     SCK_CloseSocket(sock_fd1);
-    SCH_AddFileHandler(sock_fd2, SCH_FILE_INPUT, handle_helper_request, NULL);
 
-    run_helper(uid, gid, scfilter_level);
+    run_helper(uid, gid, scfilter_level, sock_fd2);
   }
 
   SCK_CloseSocket(sock_fd2);
@@ -931,8 +960,7 @@ NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie)
   header->key_id = htonl(key->id);
 
   nonce = cookie->cookie + sizeof (*header);
-  if (key->nonce_length > sizeof (cookie->cookie) - sizeof (*header))
-    assert(0);
+  BRIEF_ASSERT(key->nonce_length <= sizeof (cookie->cookie) - sizeof (*header));
   UTI_GetRandomBytes(nonce, key->nonce_length);
 
   plaintext_length = context->c2s.length + context->s2c.length;

nts_ke_session.c

@@ -663,8 +663,7 @@ create_credentials(const char **certs, const char **keys, int n_certs_keys,
     goto error;
 
   if (certs && keys) {
-    if (trusted_certs || trusted_certs_ids)
-      assert(0);
+    BRIEF_ASSERT(!trusted_certs && !trusted_certs_ids);
 
     for (i = 0; i < n_certs_keys; i++) {
       if (!UTI_CheckFilePermissions(keys[i], 0771))
@@ -675,8 +674,7 @@ create_credentials(const char **certs, const char **keys, int n_certs_keys,
         goto error;
     }
   } else {
-    if (certs || keys || n_certs_keys > 0)
-      assert(0);
+    BRIEF_ASSERT(!certs && !keys && n_certs_keys <= 0);
 
     if (trusted_cert_set == 0 && !CNF_GetNoSystemCert()) {
       r = gnutls_certificate_set_x509_system_trust(credentials);
@@ -877,22 +875,42 @@ NKSN_GetRecord(NKSN_Instance inst, int *critical, int *type, int *body_length,
 /* ================================================== */
 
 int
-NKSN_GetKeys(NKSN_Instance inst, SIV_Algorithm siv, NKE_Key *c2s, NKE_Key *s2c)
+NKSN_GetKeys(NKSN_Instance inst, SIV_Algorithm algorithm, SIV_Algorithm exporter_algorithm,
+             int next_protocol, NKE_Key *c2s, NKE_Key *s2c)
 {
-  int length = SIV_GetKeyLength(siv);
+  int length = SIV_GetKeyLength(algorithm);
+  struct {
+    uint16_t next_protocol;
+    uint16_t algorithm;
+    uint8_t is_s2c;
+    uint8_t _pad;
+  } context;
+
+  if (!inst->tls_session)
+    return 0;
 
   if (length <= 0 || length > sizeof (c2s->key) || length > sizeof (s2c->key)) {
     DEBUG_LOG("Invalid algorithm");
     return 0;
   }
 
+  assert(sizeof (context) == 6);
+  context.next_protocol = htons(next_protocol);
+  context.algorithm = htons(exporter_algorithm);
+
+  context.is_s2c = 0;
   if (gnutls_prf_rfc5705(inst->tls_session,
                          sizeof (NKE_EXPORTER_LABEL) - 1, NKE_EXPORTER_LABEL,
-                         sizeof (NKE_EXPORTER_CONTEXT_C2S) - 1, NKE_EXPORTER_CONTEXT_C2S,
-                         length, (char *)c2s->key) < 0 ||
-      gnutls_prf_rfc5705(inst->tls_session,
+                         sizeof (context) - 1, (char *)&context,
+                         length, (char *)c2s->key) < 0) {
+    DEBUG_LOG("Could not export key");
+    return 0;
+  }
+
+  context.is_s2c = 1;
+  if (gnutls_prf_rfc5705(inst->tls_session,
                          sizeof (NKE_EXPORTER_LABEL) - 1, NKE_EXPORTER_LABEL,
-                         sizeof (NKE_EXPORTER_CONTEXT_S2C) - 1, NKE_EXPORTER_CONTEXT_S2C,
+                         sizeof (context) - 1, (char *)&context,
                          length, (char *)s2c->key) < 0) {
     DEBUG_LOG("Could not export key");
     return 0;

nts_ke_session.h

@@ -77,8 +77,11 @@ extern int NKSN_EndMessage(NKSN_Instance inst);
 extern int NKSN_GetRecord(NKSN_Instance inst, int *critical, int *type, int *body_length,
                           void *body, int buffer_length);
 
-/* Export NTS keys for a specified algorithm */
-extern int NKSN_GetKeys(NKSN_Instance inst, SIV_Algorithm siv, NKE_Key *c2s, NKE_Key *s2c);
+/* Export NTS keys for a specified algorithm (for compatibility reasons the
+   RFC5705 exporter context is allowed to have a different algorithm) */
+extern int NKSN_GetKeys(NKSN_Instance inst, SIV_Algorithm algorithm,
+                        SIV_Algorithm exporter_algorithm,
+                        int next_protocol, NKE_Key *c2s, NKE_Key *s2c);
 
 /* Check if the session has stopped */
 extern int NKSN_IsStopped(NKSN_Instance inst);

nts_ntp_auth.c

@@ -104,9 +104,8 @@ NNA_GenerateAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv,
   body = (unsigned char *)(header + 1);
   ciphertext = body + nonce_length + nonce_padding;
 
-  if ((unsigned char *)header + auth_length !=
-      ciphertext + ciphertext_length + ciphertext_padding + additional_padding)
-    assert(0);
+  BRIEF_ASSERT((unsigned char *)header + auth_length ==
+               ciphertext + ciphertext_length + ciphertext_padding + additional_padding);
 
   memcpy(body, nonce, nonce_length);
   memset(body + nonce_length, 0, nonce_padding);

nts_ntp_client.c

@@ -72,6 +72,7 @@ struct NNC_Instance_Record {
   double last_nke_success;
 
   NKE_Context context;
+  NKE_Context alt_context;
   unsigned int context_id;
   NKE_Cookie cookies[NTS_MAX_COOKIES];
   int num_cookies;
@@ -105,6 +106,7 @@ reset_instance(NNC_Instance inst)
   inst->last_nke_success = 0.0;
 
   memset(&inst->context, 0, sizeof (inst->context));
+  memset(&inst->alt_context, 0, sizeof (inst->alt_context));
   inst->context_id = 0;
   memset(inst->cookies, 0, sizeof (inst->cookies));
   inst->num_cookies = 0;
@@ -165,6 +167,21 @@ check_cookies(NNC_Instance inst)
   if (inst->num_cookies > 0 &&
       ((inst->nak_response && !inst->ok_response) ||
        SCH_GetLastEventMonoTime() - inst->last_nke_success > CNF_GetNtsRefresh())) {
+
+    /* Before dropping the cookies, check whether there is an alternate set of
+       keys available (exported with the compliant context for AES-128-GCM-SIV)
+       and the NAK was the only valid response after the last NTS-KE session,
+       indicating we use incorrect keys and switching to the other set of keys
+       for the following NTP requests might work */
+    if (inst->alt_context.algorithm != AEAD_SIV_INVALID &&
+        inst->alt_context.algorithm == inst->context.algorithm &&
+        inst->nke_attempts > 0 && inst->nak_response && !inst->ok_response) {
+      inst->context = inst->alt_context;
+      inst->alt_context.algorithm = AEAD_SIV_INVALID;
+      DEBUG_LOG("Switched to compliant keys");
+      return 1;
+    }
+
     inst->num_cookies = 0;
     DEBUG_LOG("Dropped cookies");
   }
@@ -261,7 +278,7 @@ get_cookies(NNC_Instance inst)
   assert(sizeof (inst->cookies) / sizeof (inst->cookies[0]) == NTS_MAX_COOKIES);
 
   /* Get the new keys, cookies and NTP address if the session was successful */
-  got_data = NKC_GetNtsData(inst->nke, &inst->context,
+  got_data = NKC_GetNtsData(inst->nke, &inst->context, &inst->alt_context,
                             inst->cookies, &inst->num_cookies, NTS_MAX_COOKIES,
                             &ntp_address);
 
@@ -520,6 +537,7 @@ NNC_CheckResponseAuth(NNC_Instance inst, NTP_Packet *packet,
      new NTS-KE session to be started as soon as the cookies run out. */
   inst->nke_attempts = 0;
   inst->next_nke_attempt = 0.0;
+  inst->alt_context.algorithm = AEAD_SIV_INVALID;
 
   return 1;
 }
@@ -643,6 +661,7 @@ load_cookies(NNC_Instance inst)
         sscanf(words[0], "%u", &context_id) != 1 || sscanf(words[1], "%d", &algorithm) != 1)
     goto error;
 
+  inst->alt_context.algorithm = AEAD_SIV_INVALID;
   inst->context.algorithm = algorithm;
   inst->context.s2c.length = UTI_HexToBytes(words[2], inst->context.s2c.key,
                                             sizeof (inst->context.s2c.key));
@@ -687,6 +706,7 @@ error:
   fclose(f);
 
   memset(&inst->context, 0, sizeof (inst->context));
+  memset(&inst->alt_context, 0, sizeof (inst->alt_context));
   inst->num_cookies = 0;
 }
 

nts_ntp_server.c

@@ -259,8 +259,7 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
 
   /* Make sure this is a response to the request from the last call
      of NNS_CheckRequestAuth() */
-  if (UTI_CompareNtp64(&server->req_tx, &request->transmit_ts) != 0)
-    assert(0);
+  BRIEF_ASSERT(UTI_CompareNtp64(&server->req_tx, &request->transmit_ts) == 0);
 
   for (parsed = NTP_HEADER_LENGTH; parsed < req_info->length; parsed += ef_length) {
     if (!NEF_ParseField(request, req_info->length, parsed,
@@ -279,7 +278,7 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
   }
 
   /* NTS NAK response does not have any other fields */
-  if (kod)
+  if (kod == NTP_KOD_NTS_NAK)
     return 1;
 
   for (i = 0, plaintext_length = 0; i < server->num_cookies; i++) {

pktlength.c

@@ -55,7 +55,7 @@ struct request_length {
 };
 
 static const struct request_length request_lengths[] = {
-  REQ_LENGTH_ENTRY(null, null),                 /* NULL */
+  { 0, 0 },                                     /* NULL - not supported */
   REQ_LENGTH_ENTRY(online, null),               /* ONLINE */
   REQ_LENGTH_ENTRY(offline, null),              /* OFFLINE */
   REQ_LENGTH_ENTRY(burst, null),                /* BURST */
@@ -65,7 +65,7 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(modify_maxdelay, null),      /* MODIFY_MAXDELAY */
   REQ_LENGTH_ENTRY(modify_maxdelayratio, null), /* MODIFY_MAXDELAYRATIO */
   REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
-  REQ_LENGTH_ENTRY(logon, null),                /* LOGON */
+  { 0, 0 },                                     /* LOGON - not supported */
   REQ_LENGTH_ENTRY(settime, manual_timestamp),  /* SETTIME */
   { 0, 0 },                                     /* LOCAL */
   REQ_LENGTH_ENTRY(manual, null),               /* MANUAL */
@@ -111,7 +111,7 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(null, null),                 /* REFRESH */
   REQ_LENGTH_ENTRY(null, server_stats),         /* SERVER_STATS */
   { 0, 0 },                                     /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
-  REQ_LENGTH_ENTRY(local, null),                /* LOCAL2 */
+  { 0, 0 },                                     /* LOCAL2 - not supported */
   REQ_LENGTH_ENTRY(ntp_data, ntp_data),         /* NTP_DATA */
   { 0, 0 },                                     /* ADD_SERVER2 */
   { 0, 0 },                                     /* ADD_PEER2 */
@@ -130,6 +130,8 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(null, null),                 /* RELOAD_SOURCES */
   REQ_LENGTH_ENTRY(doffset, null),              /* DOFFSET2 */
   REQ_LENGTH_ENTRY(modify_select_opts, null),   /* MODIFY_SELECTOPTS */
+  REQ_LENGTH_ENTRY(modify_offset, null),        /* MODIFY_OFFSET */
+  REQ_LENGTH_ENTRY(local, null),                /* LOCAL3 */
 };
 
 static const uint16_t reply_lengths[] = {
@@ -149,7 +151,7 @@ static const uint16_t reply_lengths[] = {
   RPY_LENGTH_ENTRY(smoothing),                  /* SMOOTHING */
   0,                                            /* SERVER_STATS - not supported */
   0,                                            /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
-  RPY_LENGTH_ENTRY(ntp_data),                   /* NTP_DATA */
+  0,                                            /* NTP_DATA - not supported */
   RPY_LENGTH_ENTRY(manual_timestamp),           /* MANUAL_TIMESTAMP2 */
   RPY_LENGTH_ENTRY(manual_list),                /* MANUAL_LIST2 */
   RPY_LENGTH_ENTRY(ntp_source_name),            /* NTP_SOURCE_NAME */
@@ -159,6 +161,7 @@ static const uint16_t reply_lengths[] = {
   RPY_LENGTH_ENTRY(select_data),                /* SELECT_DATA */
   0,                                            /* SERVER_STATS3 - not supported */
   RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS4 */
+  RPY_LENGTH_ENTRY(ntp_data),                   /* NTP_DATA2 */
 };
 
 /* ================================================== */

privops.c

@@ -141,6 +141,7 @@ have_helper(void)
 /* ======================================================================= */
 
 /* HELPER - prepare fatal error for daemon */
+FORMAT_ATTRIBUTE_PRINTF(2, 3)
 static void
 res_fatal(PrvResponse *res, const char *fmt, ...)
 {
@@ -546,9 +547,9 @@ PRV_BindSocket(int sock, struct sockaddr *address, socklen_t address_len)
   PrvResponse res;
 
   SCK_SockaddrToIPSockAddr(address, address_len, &ip_saddr);
-  if (ip_saddr.port != 0 && ip_saddr.port != CNF_GetNTPPort() &&
-      ip_saddr.port != CNF_GetAcquisitionPort() && ip_saddr.port != CNF_GetPtpPort())
-    assert(0);
+  BRIEF_ASSERT(ip_saddr.port == 0 || ip_saddr.port == CNF_GetNTPPort() ||
+               ip_saddr.port == CNF_GetAcquisitionPort() ||
+               ip_saddr.port == CNF_GetPtpPort());
 
   if (!have_helper())
     return bind(sock, address, address_len);

ptp.h

@@ -31,9 +31,10 @@
 
 #include "ntp.h"
 
-#define PTP_VERSION 2
+#define PTP_VERSION_2 2
+#define PTP_VERSION_2_1 (2 | 1 << 4)
+#define PTP_TYPE_SYNC 0
 #define PTP_TYPE_DELAY_REQ 1
-#define PTP_DOMAIN_NTP 123
 #define PTP_FLAG_UNICAST (1 << (2 + 8))
 #define PTP_TLV_NTP 0x2023
 

quantiles.c

@@ -49,20 +49,21 @@ struct QNT_Instance_Record {
   int q;
   int min_k;
   double min_step;
+  double neg_step_limit;
   int n_set;
 };
 
 /* ================================================== */
 
 QNT_Instance
-QNT_CreateInstance(int min_k, int max_k, int q, int repeat, double min_step)
+QNT_CreateInstance(int min_k, int max_k, int q, int repeat,
+                   int large_step_delay, double min_step)
 {
   QNT_Instance inst;
   long seed;
 
-  if (q < 2 || min_k > max_k || min_k < 1 || max_k >= q ||
-      repeat < 1 || repeat > MAX_REPEAT || min_step <= 0.0)
-    assert(0);
+  BRIEF_ASSERT(q >= 2 && min_k <= max_k && min_k >= 1 && max_k < q && repeat >= 1 &&
+               repeat <= MAX_REPEAT && min_step > 0.0 && large_step_delay >= 0);
 
   inst = MallocNew(struct QNT_Instance_Record);
   inst->n_quants = (max_k - min_k + 1) * repeat;
@@ -71,6 +72,7 @@ QNT_CreateInstance(int min_k, int max_k, int q, int repeat, double min_step)
   inst->q = q;
   inst->min_k = min_k;
   inst->min_step = min_step;
+  inst->neg_step_limit = -large_step_delay * min_step;
 
   QNT_Reset(inst);
 
@@ -114,8 +116,7 @@ insert_initial_value(QNT_Instance inst, double value)
 {
   int i, j, r = inst->repeat;
 
-  if (inst->n_set * r >= inst->n_quants)
-    assert(0);
+  BRIEF_ASSERT(inst->n_set * r < inst->n_quants);
 
   /* Keep the initial estimates repeated and ordered */
   for (i = inst->n_set; i > 0 && inst->quants[(i - 1) * r].est > value; i--) {
@@ -136,29 +137,36 @@ insert_initial_value(QNT_Instance inst, double value)
 
 static void
 update_estimate(struct Quantile *quantile, double value, double p, double rand,
-                double min_step)
+                double min_step, double neg_step_limit)
 {
-  if (value > quantile->est && rand > (1.0 - p)) {
+  if (value >= quantile->est) {
+    if (rand < (1.0 - p))
+        return;
     quantile->step += quantile->sign > 0 ? min_step : -min_step;
-    quantile->est += quantile->step > 0.0 ? fabs(quantile->step) : min_step;
+    quantile->est += quantile->step > min_step ? quantile->step : min_step;
     if (quantile->est > value) {
       quantile->step += value - quantile->est;
-      quantile->est = value;
+      quantile->est = value + min_step / 4.0;
     }
     if (quantile->sign < 0 && quantile->step > min_step)
       quantile->step = min_step;
     quantile->sign = 1;
-  } else if (value < quantile->est && rand > p) {
+  } else {
+    if (rand < p)
+      return;
     quantile->step += quantile->sign < 0 ? min_step : -min_step;
-    quantile->est -= quantile->step > 0.0 ? fabs(quantile->step) : min_step;
+    quantile->est -= quantile->step > min_step ? quantile->step : min_step;
     if (quantile->est < value) {
       quantile->step += quantile->est - value;
-      quantile->est = value;
+      quantile->est = value - min_step / 4.0;
     }
     if (quantile->sign > 0 && quantile->step > min_step)
       quantile->step = min_step;
     quantile->sign = -1;
   }
+
+  if (quantile->step < neg_step_limit)
+    quantile->step = neg_step_limit;
 }
 
 /* ================================================== */
@@ -179,7 +187,7 @@ QNT_Accumulate(QNT_Instance inst, double value)
     p = (double)(i / inst->repeat + inst->min_k) / inst->q;
     rand = (double)random() / ((1U << 31) - 1);
 
-    update_estimate(&inst->quants[i], value, p, rand, inst->min_step);
+    update_estimate(&inst->quants[i], value, p, rand, inst->min_step, inst->neg_step_limit);
   }
 }
 
@@ -193,14 +201,29 @@ QNT_GetMinK(QNT_Instance inst)
 
 /* ================================================== */
 
+int
+QNT_GetMaxK(QNT_Instance inst)
+{
+  return inst->min_k + (inst->n_quants / inst->repeat) - 1;
+}
+
+/* ================================================== */
+
+double
+QNT_GetMinStep(QNT_Instance inst)
+{
+  return inst->min_step;
+}
+
+/* ================================================== */
+
 double
 QNT_GetQuantile(QNT_Instance inst, int k)
 {
   double estimates[MAX_REPEAT];
   int i;
 
-  if (k < inst->min_k || k - inst->min_k >= inst->n_quants)
-    assert(0);
+  BRIEF_ASSERT(k >= inst->min_k && (k - inst->min_k) * inst->repeat < inst->n_quants);
 
   for (i = 0; i < inst->repeat; i++)
     estimates[i] = inst->quants[(k - inst->min_k) * inst->repeat + i].est;

quantiles.h

@@ -30,12 +30,15 @@
 
 typedef struct QNT_Instance_Record *QNT_Instance;
 
-extern QNT_Instance QNT_CreateInstance(int min_k, int max_k, int q, int repeat, double min_step);
+extern QNT_Instance QNT_CreateInstance(int min_k, int max_k, int q, int repeat,
+                                       int large_step_delay, double min_step);
 extern void QNT_DestroyInstance(QNT_Instance inst);
 
 extern void QNT_Reset(QNT_Instance inst);
 extern void QNT_Accumulate(QNT_Instance inst, double value);
 extern int QNT_GetMinK(QNT_Instance inst);
+extern int QNT_GetMaxK(QNT_Instance inst);
+extern double QNT_GetMinStep(QNT_Instance inst);
 extern double QNT_GetQuantile(QNT_Instance inst, int k);
 
 #endif

refclock.c

@@ -48,6 +48,7 @@ extern RefclockDriver RCL_SHM_driver;
 extern RefclockDriver RCL_SOCK_driver;
 extern RefclockDriver RCL_PPS_driver;
 extern RefclockDriver RCL_PHC_driver;
+extern RefclockDriver RCL_RTC_driver;
 
 struct FilterSample {
   double offset;
@@ -63,6 +64,7 @@ struct RCL_Instance_Record {
   int driver_poll;
   int driver_polled;
   int poll;
+  int reached;
   int leap_status;
   int local;
   int pps_forced;
@@ -159,6 +161,8 @@ RCL_AddRefclock(RefclockParameters *params)
     inst->driver = &RCL_PPS_driver;
   } else if (strcmp(params->driver_name, "PHC") == 0) {
     inst->driver = &RCL_PHC_driver;
+  } else if (strcmp(params->driver_name, "RTC") == 0) {
+    inst->driver = &RCL_RTC_driver;
   } else {
     LOG_FATAL("unknown refclock driver %s", params->driver_name);
   }
@@ -166,8 +170,8 @@ RCL_AddRefclock(RefclockParameters *params)
   if (!inst->driver->init && !inst->driver->poll)
     LOG_FATAL("refclock driver %s is not compiled in", params->driver_name);
 
-  if (params->tai && !CNF_GetLeapSecTimezone())
-    LOG_FATAL("refclock tai option requires leapsectz");
+  if (params->tai && !CNF_GetLeapSecList() && !CNF_GetLeapSecTimezone())
+    LOG_FATAL("refclock tai option requires leapseclist or leapsectz");
 
   inst->data = NULL;
   inst->driver_parameter = Strdup(params->driver_parameter);
@@ -175,6 +179,7 @@ RCL_AddRefclock(RefclockParameters *params)
   inst->driver_poll = params->driver_poll;
   inst->poll = params->poll;
   inst->driver_polled = 0;
+  inst->reached = 0;
   inst->leap_status = LEAP_Normal;
   inst->local = params->local;
   inst->pps_forced = params->pps_forced;
@@ -226,29 +231,16 @@ RCL_AddRefclock(RefclockParameters *params)
   }
 
   if (inst->driver->poll) {
-    int max_samples;
-
     if (inst->driver_poll > inst->poll)
       inst->driver_poll = inst->poll;
-
-    max_samples = 1 << (inst->poll - inst->driver_poll);
-    if (max_samples < params->filter_length) {
-      if (max_samples < 4) {
-        LOG(LOGS_WARN, "Setting filter length for %s to %d",
-            UTI_RefidToString(inst->ref_id), max_samples);
-      }
-      params->filter_length = max_samples;
-    }
   }
 
   if (inst->driver->init && !inst->driver->init(inst))
     LOG_FATAL("refclock %s initialisation failed", params->driver_name);
 
-  /* Require the filter to have at least 4 samples to produce a filtered
-     sample, or be full for shorter lengths, and combine 60% of samples
-     closest to the median */
-  inst->filter = SPF_CreateInstance(MIN(params->filter_length, 4), params->filter_length,
-                                    params->max_dispersion, 0.6);
+  /* Don't require more than one sample per poll and combine 60% of the
+     samples closest to the median offset */
+  inst->filter = SPF_CreateInstance(1, params->filter_length, params->max_dispersion, 0.6);
 
   inst->source = SRC_CreateNewInstance(inst->ref_id, SRC_REFCLOCK, 0, params->sel_options,
                                        NULL, params->min_samples, params->max_samples,
@@ -321,6 +313,22 @@ RCL_ReportSource(RPT_SourceReport *report, struct timespec *now)
   }
 }
 
+int
+RCL_ModifyOffset(uint32_t ref_id, double offset)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARR_GetSize(refclocks); i++) {
+    RCL_Instance inst = get_refclock(i);
+    if (inst->ref_id == ref_id) {
+      inst->offset = offset;
+      LOG(LOGS_INFO, "Source %s new offset %f", UTI_RefidToString(ref_id), offset);
+      return 1;
+    }
+  }
+  return 0;
+}
+
 void
 RCL_SetDriverData(RCL_Instance instance, void *data)
 {
@@ -649,6 +657,12 @@ RCL_AddCookedPulse(RCL_Instance instance, struct timespec *cooked_time,
   return 1;
 }
 
+void
+RCL_UpdateReachability(RCL_Instance instance)
+{
+  instance->reached++;
+}
+
 double
 RCL_GetPrecision(RCL_Instance instance)
 {
@@ -776,6 +790,9 @@ poll_timeout(void *arg)
   if (!(inst->driver->poll && inst->driver_polled < (1 << (inst->poll - inst->driver_poll)))) {
     inst->driver_polled = 0;
 
+    SRC_UpdateReachability(inst->source, inst->reached > 0);
+    inst->reached = 0;
+
     if (SPF_GetFilteredSample(inst->filter, &sample)) {
       double local_freq, local_offset;
       struct timespec local_ref_time;
@@ -791,7 +808,6 @@ poll_timeout(void *arg)
         inst->leap_status = LEAP_Unsynchronised;
       }
 
-      SRC_UpdateReachability(inst->source, 1);
       SRC_UpdateStatus(inst->source, stratum, inst->leap_status);
       SRC_AccumulateSample(inst->source, &sample);
       SRC_SelectSource(inst->source);
@@ -800,8 +816,6 @@ poll_timeout(void *arg)
         follow_local(inst, &local_ref_time, local_freq, local_offset);
 
       log_sample(inst, &sample.time, 1, 0, 0.0, sample.offset, sample.peer_dispersion);
-    } else {
-      SRC_UpdateReachability(inst->source, 0);
     }
   }
 

refclock.h

@@ -68,6 +68,7 @@ extern void RCL_Finalise(void);
 extern int RCL_AddRefclock(RefclockParameters *params);
 extern void RCL_StartRefclocks(void);
 extern void RCL_ReportSource(RPT_SourceReport *report, struct timespec *now);
+extern int RCL_ModifyOffset(uint32_t ref_id, double offset);
 
 /* functions used by drivers */
 extern void RCL_SetDriverData(RCL_Instance instance, void *data);
@@ -80,6 +81,7 @@ extern int RCL_AddSample(RCL_Instance instance, struct timespec *sample_time,
 extern int RCL_AddPulse(RCL_Instance instance, struct timespec *pulse_time, double second);
 extern int RCL_AddCookedPulse(RCL_Instance instance, struct timespec *cooked_time,
                               double second, double dispersion, double raw_correction);
+extern void RCL_UpdateReachability(RCL_Instance instance);
 extern double RCL_GetPrecision(RCL_Instance instance);
 extern int RCL_GetDriverPoll(RCL_Instance instance);
 

refclock_phc.c

@@ -74,7 +74,7 @@ static int phc_initialise(RCL_Instance instance)
 
   path = RCL_GetDriverParameter(instance);
  
-  phc_fd = SYS_Linux_OpenPHC(path, 0);
+  phc_fd = SYS_Linux_OpenPHC(path);
   if (phc_fd < 0)
     LOG_FATAL("Could not open PHC");
 
@@ -154,6 +154,8 @@ static void process_ext_pulse(RCL_Instance instance, struct timespec *phc_ts)
   }
   phc->last_extts = *phc_ts;
 
+  RCL_UpdateReachability(instance);
+
   if (!HCL_CookTime(phc->clock, phc_ts, &local_ts, &local_err))
     return;
 
@@ -175,7 +177,7 @@ static void read_ext_pulse(int fd, int event, void *anything)
   instance = anything;
   phc1 = RCL_GetDriverData(instance);
 
-  /* The Linux kernel (as of 6.2) has one shared queue of timestamps for all
+  /* Linux versions before 6.7 had one shared queue of timestamps for all
      descriptors of the same PHC.  Search for all refclocks that expect
      the timestamp. */
 
@@ -204,6 +206,9 @@ static int phc_poll(RCL_Instance instance)
   if (n_readings < 1)
     return 0;
 
+  if (!phc->extpps)
+    RCL_UpdateReachability(instance);
+
   if (!HCL_ProcessReadings(phc->clock, n_readings, readings, &phc_ts, &sys_ts, &phc_err))
     return 0;
 

refclock_pps.c

@@ -143,6 +143,8 @@ static int pps_poll(RCL_Instance instance)
 
   pps->last_seq = seq;
 
+  RCL_UpdateReachability(instance);
+
   return RCL_AddPulse(instance, &ts, 1.0e-9 * ts.tv_nsec);
 }
 

refclock_rtc.c

@@ -0,0 +1,179 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Uwe Kleine-König, Pengutronix  2021
+ * Copyright (C) Ahmad Fatoum, Pengutronix  2024
+ *
+ * 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.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  RTC refclock driver.
+
+  */
+
+#include "config.h"
+
+#include "refclock.h"
+
+#ifdef FEAT_RTC
+
+#include <linux/rtc.h>
+
+#include "conf.h"
+#include "local.h"
+
+#include "logging.h"
+#include "memory.h"
+#include "sched.h"
+#include "util.h"
+#include "rtc_linux.h"
+
+struct refrtc_instance {
+  int fd;
+  int polling;
+  int utc;
+};
+
+static int refrtc_add_sample(RCL_Instance instance, struct timespec *now,
+                             time_t rtc_sec, long rtc_nsec)
+{
+  struct timespec rtc_ts;
+  int status;
+
+  rtc_ts.tv_sec = rtc_sec;
+  rtc_ts.tv_nsec = rtc_nsec;
+
+  RCL_UpdateReachability(instance);
+
+  status = RCL_AddSample(instance, now, &rtc_ts, LEAP_Normal);
+
+  return status;
+}
+
+static void refrtc_read_after_uie(int rtcfd, int event, void *data)
+{
+  RCL_Instance instance = (RCL_Instance)data;
+  struct refrtc_instance *rtc = RCL_GetDriverData(instance);
+  struct timespec now;
+  time_t rtc_sec;
+  int status;
+
+  status = RTC_Linux_CheckInterrupt(rtcfd);
+  if (status < 0) {
+    SCH_RemoveFileHandler(rtcfd);
+    RTC_Linux_SwitchInterrupt(rtcfd, 0); /* Likely to raise error too, but just to be sure... */
+    close(rtcfd);
+    rtc->fd = -1;
+    return;
+  } else if (status == 0) {
+    /* Wait for the next interrupt, this one may be bogus */
+    return;
+  }
+
+  rtc_sec = RTC_Linux_ReadTimeAfterInterrupt(rtcfd, rtc->utc, NULL, &now);
+  if (rtc_sec == (time_t)-1)
+    return;
+
+  refrtc_add_sample(instance, &now, rtc_sec, 0);
+}
+
+static int refrtc_initialise(RCL_Instance instance)
+{
+  const char *options[] = {"utc", NULL};
+  struct refrtc_instance *rtc;
+  int rtcfd, status;
+  const char *path;
+
+  RCL_CheckDriverOptions(instance, options);
+
+  if (CNF_GetRtcSync() || CNF_GetRtcFile())
+    LOG_FATAL("RTC refclock cannot be used together with rtcsync or rtcfile");
+
+  path = RCL_GetDriverParameter(instance);
+
+  rtcfd = open(path, O_RDONLY);
+  if (rtcfd < 0)
+    LOG_FATAL("Could not open RTC device %s : %s", path, strerror(errno));
+
+  /* Close on exec */
+  UTI_FdSetCloexec(rtcfd);
+
+  rtc = MallocNew(struct refrtc_instance);
+  rtc->fd = rtcfd;
+  rtc->utc = RCL_GetDriverOption(instance, "utc") ? 1 : 0;
+
+  RCL_SetDriverData(instance, rtc);
+
+  /* Try to enable update interrupts */
+  status = RTC_Linux_SwitchInterrupt(rtcfd, 1);
+  if (status) {
+    SCH_AddFileHandler(rtcfd, SCH_FILE_INPUT, refrtc_read_after_uie, instance);
+    rtc->polling = 0;
+  } else {
+    LOG(LOGS_INFO, "Falling back to polling for %s", path);
+    rtc->polling = 1;
+  }
+
+  return 1;
+}
+
+static void refrtc_finalise(RCL_Instance instance)
+{
+  struct refrtc_instance *rtc;
+
+  rtc = RCL_GetDriverData(instance);
+
+  if (!rtc->polling) {
+    SCH_RemoveFileHandler(rtc->fd);
+    RTC_Linux_SwitchInterrupt(rtc->fd, 0);
+  }
+
+  close(rtc->fd);
+  Free(rtc);
+}
+
+static int refrtc_poll(RCL_Instance instance)
+{
+  struct refrtc_instance *rtc;
+  struct timespec now;
+  time_t rtc_sec;
+
+  rtc = RCL_GetDriverData(instance);
+
+  if (!rtc->polling)
+    return 0;
+
+  rtc_sec = RTC_Linux_ReadTimeNow(rtc->fd, rtc->utc, NULL, &now);
+  if (rtc_sec == (time_t)-1)
+    return 0;
+
+  /* As the rtc has a resolution of 1s, only add half a second */
+  return refrtc_add_sample(instance, &now, rtc_sec, 500000000);
+}
+
+RefclockDriver RCL_RTC_driver = {
+  refrtc_initialise,
+  refrtc_finalise,
+  refrtc_poll
+};
+
+#else
+
+RefclockDriver RCL_RTC_driver = { NULL, NULL, NULL };
+
+#endif

refclock_shm.c

@@ -109,6 +109,8 @@ static int shm_poll(RCL_Instance instance)
 
   shm->valid = 0;
 
+  RCL_UpdateReachability(instance);
+
   receive_ts.tv_sec = t.receiveTimeStampSec;
   clock_ts.tv_sec = t.clockTimeStampSec;
 

refclock_sock.c

@@ -129,6 +129,8 @@ static void read_sample(int sockfd, int event, void *anything)
   UTI_TimevalToTimespec(&sample.tv, &sys_ts);
   UTI_NormaliseTimespec(&sys_ts);
 
+  RCL_UpdateReachability(instance);
+
   if (!UTI_IsTimeOffsetSane(&sys_ts, sample.offset))
     return;
 

reference.c

@@ -4,6 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Miroslav Lichvar  2009-2018, 2020, 2022
+ * Copyright (C) Andy Fiddaman  2024
  * 
  * 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 +34,7 @@
 #include "reference.h"
 #include "util.h"
 #include "conf.h"
+#include "leapdb.h"
 #include "logging.h"
 #include "local.h"
 #include "sched.h"
@@ -45,14 +47,15 @@
 /* The update interval of the reference in the local reference mode */
 #define LOCAL_REF_UPDATE_INTERVAL 64.0
 
-/* Interval between updates of the drift file */
-#define MAX_DRIFTFILE_AGE 3600.0
-
 static int are_we_synchronised;
 static int enable_local_stratum;
 static int local_stratum;
 static int local_orphan;
 static double local_distance;
+static int local_activate_ok;
+static double local_activate;
+static double local_wait_synced;
+static double local_wait_unsynced;
 static struct timespec local_ref_time;
 static NTP_Leap our_leap_status;
 static int our_leap_sec;
@@ -61,6 +64,7 @@ static int our_stratum;
 static uint32_t our_ref_id;
 static IPAddr our_ref_ip;
 static struct timespec our_ref_time;
+static double unsynchronised_since;
 static double our_skew;
 static double our_residual_freq;
 static double our_root_delay;
@@ -106,6 +110,7 @@ static REF_ModeEndHandler mode_end_handler = NULL;
 /* Filename of the drift file. */
 static char *drift_file=NULL;
 static double drift_file_age;
+static int drift_file_interval;
 
 static void update_drift_file(double, double);
 
@@ -122,9 +127,6 @@ static int leap_in_progress;
 /* Timer for the leap second handler */
 static SCH_TimeoutID leap_timeout_id;
 
-/* Name of a system timezone containing leap seconds occuring at midnight */
-static char *leap_tzname;
-
 /* ================================================== */
 
 static LOG_FileID logfileid;
@@ -155,7 +157,6 @@ static int ref_adjustments;
 
 /* ================================================== */
 
-static NTP_Leap get_tz_leap(time_t when, int *tai_offset);
 static void update_leap_status(NTP_Leap leap, time_t now, int reset);
 
 /* ================================================== */
@@ -195,7 +196,6 @@ REF_Initialise(void)
   FILE *in;
   double file_freq_ppm, file_skew_ppm;
   double our_frequency_ppm;
-  int tai_offset;
 
   mode = REF_ModeNormal;
   are_we_synchronised = 0;
@@ -211,9 +211,10 @@ REF_Initialise(void)
   our_frequency_sd = 0.0;
   our_offset_sd = 0.0;
   drift_file_age = 0.0;
+  local_activate_ok = 0;
 
   /* Now see if we can get the drift file opened */
-  drift_file = CNF_GetDriftFile();
+  drift_file = CNF_GetDriftFile(&drift_file_interval);
   if (drift_file) {
     in = UTI_OpenFile(NULL, drift_file, NULL, 'r', 0);
     if (in) {
@@ -249,8 +250,12 @@ REF_Initialise(void)
 
   correction_time_ratio = CNF_GetCorrectionTimeRatio();
 
-  enable_local_stratum = CNF_AllowLocalReference(&local_stratum, &local_orphan, &local_distance);
+  enable_local_stratum = CNF_AllowLocalReference(&local_stratum, &local_orphan,
+                                                 &local_distance, &local_activate,
+                                                 &local_wait_synced,
+                                                 &local_wait_unsynced);
   UTI_ZeroTimespec(&local_ref_time);
+  unsynchronised_since = SCH_GetLastEventMonoTime();
 
   leap_when = 0;
   leap_timeout_id = 0;
@@ -260,18 +265,6 @@ REF_Initialise(void)
   if (leap_mode == REF_LeapModeSystem && !LCL_CanSystemLeap())
     leap_mode = REF_LeapModeStep;
 
-  leap_tzname = CNF_GetLeapSecTimezone();
-  if (leap_tzname) {
-    /* Check that the timezone has good data for Jun 30 2012 and Dec 31 2012 */
-    if (get_tz_leap(1341014400, &tai_offset) == LEAP_InsertSecond && tai_offset == 34 &&
-        get_tz_leap(1356912000, &tai_offset) == LEAP_Normal && tai_offset == 35) {
-      LOG(LOGS_INFO, "Using %s timezone to obtain leap second data", leap_tzname);
-    } else {
-      LOG(LOGS_WARN, "Timezone %s failed leap second check, ignoring", leap_tzname);
-      leap_tzname = NULL;
-    }
-  }
-
   CNF_GetMakeStep(&make_step_limit, &make_step_threshold);
   CNF_GetMaxChange(&max_offset_delay, &max_offset_ignore, &max_offset);
   CNF_GetMailOnChange(&do_mail_change, &mail_change_threshold, &mail_change_user);
@@ -593,77 +586,6 @@ is_leap_second_day(time_t when)
 
 /* ================================================== */
 
-static NTP_Leap
-get_tz_leap(time_t when, int *tai_offset)
-{
-  static time_t last_tz_leap_check;
-  static NTP_Leap tz_leap;
-  static int tz_tai_offset;
-
-  struct tm stm, *tm;
-  time_t t;
-  char *tz_env, tz_orig[128];
-
-  *tai_offset = tz_tai_offset;
-
-  /* Do this check at most twice a day */
-  when = when / (12 * 3600) * (12 * 3600);
-  if (last_tz_leap_check == when)
-      return tz_leap;
-
-  last_tz_leap_check = when;
-  tz_leap = LEAP_Normal;
-  tz_tai_offset = 0;
-
-  tm = gmtime(&when);
-  if (!tm)
-    return tz_leap;
-
-  stm = *tm;
-
-  /* Temporarily switch to the timezone containing leap seconds */
-  tz_env = getenv("TZ");
-  if (tz_env) {
-    if (strlen(tz_env) >= sizeof (tz_orig))
-      return tz_leap;
-    strcpy(tz_orig, tz_env);
-  }
-  setenv("TZ", leap_tzname, 1);
-  tzset();
-
-  /* Get the TAI-UTC offset, which started at the epoch at 10 seconds */
-  t = mktime(&stm);
-  if (t != -1)
-    tz_tai_offset = t - when + 10;
-
-  /* Set the time to 23:59:60 and see how it overflows in mktime() */
-  stm.tm_sec = 60;
-  stm.tm_min = 59;
-  stm.tm_hour = 23;
-
-  t = mktime(&stm);
-
-  if (tz_env)
-    setenv("TZ", tz_orig, 1);
-  else
-    unsetenv("TZ");
-  tzset();
-
-  if (t == -1)
-    return tz_leap;
-
-  if (stm.tm_sec == 60)
-    tz_leap = LEAP_InsertSecond;
-  else if (stm.tm_sec == 1)
-    tz_leap = LEAP_DeleteSecond;
-
-  *tai_offset = tz_tai_offset;
-
-  return tz_leap;
-}
-
-/* ================================================== */
-
 static void
 leap_end_timeout(void *arg)
 {
@@ -751,16 +673,16 @@ set_leap_timeout(time_t now)
 static void
 update_leap_status(NTP_Leap leap, time_t now, int reset)
 {
-  NTP_Leap tz_leap;
+  NTP_Leap ldb_leap;
   int leap_sec, tai_offset;
 
   leap_sec = 0;
   tai_offset = 0;
 
-  if (leap_tzname && now) {
-    tz_leap = get_tz_leap(now, &tai_offset);
+  if (now) {
+    ldb_leap = LDB_GetLeap(now, &tai_offset);
     if (leap == LEAP_Normal)
-      leap = tz_leap;
+      leap = ldb_leap;
   }
 
   if (leap == LEAP_InsertSecond || leap == LEAP_DeleteSecond) {
@@ -1069,6 +991,8 @@ REF_SetReference(int stratum, NTP_Leap leap, int combined_sources,
   if (step_offset != 0.0) {
     if (LCL_ApplyStepOffset(step_offset))
       LOG(LOGS_WARN, "System clock was stepped by %.6f seconds", -step_offset);
+    else
+      LCL_AccumulateOffset(step_offset, 0.0);
   }
 
   update_leap_status(leap, raw_now.tv_sec, 0);
@@ -1087,7 +1011,7 @@ REF_SetReference(int stratum, NTP_Leap leap, int combined_sources,
   if (drift_file) {
     /* Update drift file at most once per hour */
     drift_file_age += update_interval;
-    if (drift_file_age >= MAX_DRIFTFILE_AGE) {
+    if (drift_file_age >= drift_file_interval) {
       update_drift_file(local_abs_frequency, our_skew);
       drift_file_age = 0.0;
     }
@@ -1177,6 +1101,9 @@ REF_SetUnsynchronised(void)
   our_ref_ip.family = IPADDR_INET4;
   our_ref_ip.addr.in4 = 0;
   our_stratum = 0;
+
+  if (are_we_synchronised)
+    unsynchronised_since = SCH_GetLastEventMonoTime();
   are_we_synchronised = 0;
 
   LCL_SetSyncStatus(0, 0.0, 0.0);
@@ -1219,21 +1146,30 @@ REF_GetReferenceParams
  double *root_dispersion
 )
 {
-  double dispersion, delta;
+  double dispersion, delta, distance;
+  int wait_local_ok;
 
   assert(initialised);
 
   if (are_we_synchronised) {
     dispersion = get_root_dispersion(local_time);
+    wait_local_ok = UTI_DiffTimespecsToDouble(local_time, &our_ref_time) >= local_wait_synced;
   } else {
     dispersion = 0.0;
+    wait_local_ok = SCH_GetLastEventMonoTime() - unsynchronised_since >= local_wait_unsynced;
   }
 
+  distance = our_root_delay / 2 + dispersion;
+
+  if (local_activate == 0.0 || (are_we_synchronised && distance < local_activate))
+    local_activate_ok = 1;
+
   /* Local reference is active when enabled and the clock is not synchronised
      or the root distance exceeds the threshold */
 
   if (are_we_synchronised &&
-      !(enable_local_stratum && our_root_delay / 2 + dispersion > local_distance)) {
+      !(enable_local_stratum && local_activate_ok && wait_local_ok &&
+        distance > local_distance)) {
 
     *is_synchronised = 1;
 
@@ -1245,7 +1181,7 @@ REF_GetReferenceParams
     *root_delay = our_root_delay;
     *root_dispersion = dispersion;
 
-  } else if (enable_local_stratum) {
+  } else if (enable_local_stratum && local_activate_ok && wait_local_ok) {
 
     *is_synchronised = 0;
 
@@ -1345,12 +1281,16 @@ REF_ModifyMakestep(int limit, double threshold)
 /* ================================================== */
 
 void
-REF_EnableLocal(int stratum, double distance, int orphan)
+REF_EnableLocal(int stratum, double distance, int orphan, double activate,
+                double wait_synced, double wait_unsynced)
 {
   enable_local_stratum = 1;
   local_stratum = CLAMP(1, stratum, NTP_MAX_STRATUM - 1);
   local_distance = distance;
   local_orphan = !!orphan;
+  local_activate = activate;
+  local_wait_synced = wait_synced;
+  local_wait_unsynced = wait_unsynced;
   LOG(LOGS_INFO, "%s local reference mode", "Enabled");
 }
 
@@ -1368,7 +1308,7 @@ REF_DisableLocal(void)
 #define LEAP_SECOND_CLOSE 5
 
 static int
-is_leap_close(time_t t)
+is_leap_close(double t)
 {
   return leap_when != 0 &&
          t >= leap_when - LEAP_SECOND_CLOSE && t < leap_when + LEAP_SECOND_CLOSE;
@@ -1398,7 +1338,7 @@ REF_GetTaiOffset(struct timespec *ts)
 {
   int tai_offset;
 
-  get_tz_leap(ts->tv_sec, &tai_offset);
+  LDB_GetLeap(ts->tv_sec, &tai_offset);
 
   return tai_offset;
 }

reference.h

@@ -185,7 +185,8 @@ extern void REF_ModifyMaxupdateskew(double new_max_update_skew);
 /* Modify makestep settings */
 extern void REF_ModifyMakestep(int limit, double threshold);
 
-extern void REF_EnableLocal(int stratum, double distance, int orphan);
+extern void REF_EnableLocal(int stratum, double distance, int orphan, double activate,
+                            double wait_synced, double wait_unsynced);
 extern void REF_DisableLocal(void);
 
 /* Check if either of the current raw and cooked time, and optionally a

regress.c

@@ -377,7 +377,7 @@ find_ordered_entry_with_flags(double *x, int n, int index, char *flags)
       r = v;
       do {
         while (l < v && x[l] < piv) l++;
-        while (x[r] > piv) r--;
+        while (r > 0 && x[r] > piv) r--;
         if (r <= l) break;
         EXCH(x[l], x[r]);
         l++;

reports.h

@@ -181,6 +181,10 @@ typedef struct {
   uint32_t total_rx_count;
   uint32_t total_valid_count;
   uint32_t total_good_count;
+  uint32_t total_kernel_tx_ts;
+  uint32_t total_kernel_rx_ts;
+  uint32_t total_hw_tx_ts;
+  uint32_t total_hw_rx_ts;
 } RPT_NTPReport;
 
 typedef struct {

rtc.c

@@ -81,8 +81,9 @@ get_driftfile_time(void)
 {
   struct stat buf;
   char *drift_file;
+  int interval;
 
-  drift_file = CNF_GetDriftFile();
+  drift_file = CNF_GetDriftFile(&interval);
   if (!drift_file)
     return 0;
 

rtc_linux.c

@@ -296,14 +296,25 @@ slew_samples
    corresponding real time clock 'DMY HMS' form, taking account of
    whether the user runs his RTC on the local time zone or UTC */
 
-static struct tm *
-rtc_from_t(const time_t *t)
+static void
+rtc_from_t(const time_t *t, struct rtc_time *rtc_raw, int utc)
 {
-  if (rtc_on_utc) {
-    return gmtime(t);
+  struct tm *rtc_tm;
+  if (utc) {
+    rtc_tm = gmtime(t);
   } else {
-    return localtime(t);
+    rtc_tm = localtime(t);
   }
+
+  rtc_raw->tm_sec = rtc_tm->tm_sec;
+  rtc_raw->tm_min = rtc_tm->tm_min;
+  rtc_raw->tm_hour = rtc_tm->tm_hour;
+  rtc_raw->tm_mday = rtc_tm->tm_mday;
+  rtc_raw->tm_mon = rtc_tm->tm_mon;
+  rtc_raw->tm_year = rtc_tm->tm_year;
+  rtc_raw->tm_wday = rtc_tm->tm_wday;
+  rtc_raw->tm_yday = rtc_tm->tm_yday;
+  rtc_raw->tm_isdst = rtc_tm->tm_isdst;
 }
 
 /* ================================================== */
@@ -341,17 +352,27 @@ rtc_from_t(const time_t *t)
 */
 
 static time_t
-t_from_rtc(struct tm *stm) {
-  struct tm temp1, temp2, *tm;
+t_from_rtc(struct rtc_time *rtc_raw, int utc)
+{
+  struct tm rtc_tm, temp1, temp2, *tm;
   long diff;
   time_t t1, t2;
 
-  temp1 = *stm;
+  /* Convert to seconds since 1970 */
+  memset(&rtc_tm, 0, sizeof (rtc_tm));
+  rtc_tm.tm_sec = rtc_raw->tm_sec;
+  rtc_tm.tm_min = rtc_raw->tm_min;
+  rtc_tm.tm_hour = rtc_raw->tm_hour;
+  rtc_tm.tm_mday = rtc_raw->tm_mday;
+  rtc_tm.tm_mon = rtc_raw->tm_mon;
+  rtc_tm.tm_year = rtc_raw->tm_year;
+
+  temp1 = rtc_tm;
   temp1.tm_isdst = 0;
-  
+
   t1 = mktime(&temp1);
 
-  tm = rtc_on_utc ? gmtime(&t1) : localtime(&t1);
+  tm = utc ? gmtime(&t1) : localtime(&t1);
   if (!tm) {
     DEBUG_LOG("gmtime()/localtime() failed");
     return -1;
@@ -476,8 +497,8 @@ write_coefs_to_file(int valid,time_t ref_time,double offset,double rate)
 
 /* ================================================== */
 
-static int
-switch_interrupts(int on_off)
+int
+RTC_Linux_SwitchInterrupt(int fd, int on_off)
 {
   if (ioctl(fd, on_off ? RTC_UIE_ON : RTC_UIE_OFF, 0) < 0) {
     LOG(LOGS_ERR, "Could not %s RTC interrupt : %s",
@@ -508,7 +529,7 @@ RTC_Linux_Initialise(void)
   }
 
   /* Make sure the RTC supports interrupts */
-  if (!switch_interrupts(1) || !switch_interrupts(0)) {
+  if (!RTC_Linux_SwitchInterrupt(fd, 1) || !RTC_Linux_SwitchInterrupt(fd, 0)) {
     close(fd);
     return 0;
   }
@@ -557,7 +578,7 @@ RTC_Linux_Finalise(void)
   /* Remove input file handler */
   if (fd >= 0) {
     SCH_RemoveFileHandler(fd);
-    switch_interrupts(0);
+    RTC_Linux_SwitchInterrupt(fd, 0);
     close(fd);
 
     /* Save the RTC data */
@@ -578,7 +599,7 @@ static void
 measurement_timeout(void *any)
 {
   timeout_id = 0;
-  switch_interrupts(1);
+  RTC_Linux_SwitchInterrupt(fd, 1);
 }
 
 /* ================================================== */
@@ -586,21 +607,10 @@ measurement_timeout(void *any)
 static void
 set_rtc(time_t new_rtc_time)
 {
-  struct tm rtc_tm;
   struct rtc_time rtc_raw;
   int status;
 
-  rtc_tm = *rtc_from_t(&new_rtc_time);
-
-  rtc_raw.tm_sec = rtc_tm.tm_sec;
-  rtc_raw.tm_min = rtc_tm.tm_min;
-  rtc_raw.tm_hour = rtc_tm.tm_hour;
-  rtc_raw.tm_mday = rtc_tm.tm_mday;
-  rtc_raw.tm_mon = rtc_tm.tm_mon;
-  rtc_raw.tm_year = rtc_tm.tm_year;
-  rtc_raw.tm_wday = rtc_tm.tm_wday;
-  rtc_raw.tm_yday = rtc_tm.tm_yday;
-  rtc_raw.tm_isdst = rtc_tm.tm_isdst;
+  rtc_from_t(&new_rtc_time, &rtc_raw, rtc_on_utc);
 
   status = ioctl(fd, RTC_SET_TIME, &rtc_raw);
   if (status < 0) {
@@ -750,16 +760,11 @@ process_reading(time_t rtc_time, struct timespec *system_time)
 
 /* ================================================== */
 
-static void
-read_from_device(int fd_, int event, void *any)
+int
+RTC_Linux_CheckInterrupt(int fd)
 {
   int status;
   unsigned long data;
-  struct timespec sys_time;
-  struct rtc_time rtc_raw;
-  struct tm rtc_tm;
-  time_t rtc_t;
-  int error = 0;
 
   status = read(fd, &data, sizeof(data));
 
@@ -767,63 +772,79 @@ read_from_device(int fd_, int event, void *any)
     /* This looks like a bad error : the file descriptor was indicating it was
      * ready to read but we couldn't read anything.  Give up. */
     LOG(LOGS_ERR, "Could not read flags %s : %s", CNF_GetRtcDevice(), strerror(errno));
-    SCH_RemoveFileHandler(fd);
-    switch_interrupts(0); /* Likely to raise error too, but just to be sure... */
-    close(fd);
-    fd = -1;
-    return;
-  }    
+    return -1;
+  }
 
   if (skip_interrupts > 0) {
     /* Wait for the next interrupt, this one may be bogus */
     skip_interrupts--;
+    return 0;
+  }
+
+  /* Update interrupt detected? */
+  return (data & RTC_UF) == RTC_UF;
+}
+
+time_t
+RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc,
+                                 struct timespec *sys_time_cooked,
+                                 struct timespec *sys_time_raw)
+{
+  int status;
+  struct rtc_time rtc_raw;
+
+  /* Read RTC time, sandwiched between two polls of the system clock
+     so we can bound any error */
+
+  SCH_GetLastEventTime(sys_time_cooked, NULL, sys_time_raw);
+
+  status = ioctl(fd, RTC_RD_TIME, &rtc_raw);
+  if (status < 0) {
+    LOG(LOGS_ERR, "Could not read time from %s : %s", CNF_GetRtcDevice(), strerror(errno));
+    return -1;
+  }
+
+  /* Convert RTC time into a struct timespec */
+  return t_from_rtc(&rtc_raw, utc);
+}
+
+static void
+read_from_device(int fd_, int event, void *any)
+{
+  struct timespec sys_time;
+  int status, error = 0;
+  time_t rtc_t;
+
+  status = RTC_Linux_CheckInterrupt(fd);
+  if (status < 0) {
+    SCH_RemoveFileHandler(fd);
+    RTC_Linux_SwitchInterrupt(fd, 0); /* Likely to raise error too, but just to be sure... */
+    close(fd);
+    fd = -1;
+    return;
+  } else if (status == 0) {
+    /* Wait for the next interrupt, this one may be bogus */
     return;
   }
 
-  if ((data & RTC_UF) == RTC_UF) {
-    /* Update interrupt detected */
-    
-    /* Read RTC time, sandwiched between two polls of the system clock
-       so we can bound any error. */
+  rtc_t = RTC_Linux_ReadTimeAfterInterrupt(fd, rtc_on_utc, &sys_time, NULL);
+  if (rtc_t == (time_t)-1) {
+    error = 1;
+    goto turn_off_interrupt;
+  }
 
-    SCH_GetLastEventTime(&sys_time, NULL, NULL);
-
-    status = ioctl(fd, RTC_RD_TIME, &rtc_raw);
-    if (status < 0) {
-      LOG(LOGS_ERR, "Could not read time from %s : %s", CNF_GetRtcDevice(), strerror(errno));
-      error = 1;
-      goto turn_off_interrupt;
-    }
-
-    /* Convert RTC time into a struct timespec */
-    rtc_tm.tm_sec = rtc_raw.tm_sec;
-    rtc_tm.tm_min = rtc_raw.tm_min;
-    rtc_tm.tm_hour = rtc_raw.tm_hour;
-    rtc_tm.tm_mday = rtc_raw.tm_mday;
-    rtc_tm.tm_mon = rtc_raw.tm_mon;
-    rtc_tm.tm_year = rtc_raw.tm_year;
-
-    rtc_t = t_from_rtc(&rtc_tm);
-
-    if (rtc_t == (time_t)(-1)) {
-      error = 1;
-      goto turn_off_interrupt;
-    }      
-
-    process_reading(rtc_t, &sys_time);
-
-    if (n_samples < 4) {
-      measurement_period = LOWEST_MEASUREMENT_PERIOD;
-    } else if (n_samples < 6) {
-      measurement_period = LOWEST_MEASUREMENT_PERIOD << 1;
-    } else if (n_samples < 10) {
-      measurement_period = LOWEST_MEASUREMENT_PERIOD << 2;
-    } else if (n_samples < 14) {
-      measurement_period = LOWEST_MEASUREMENT_PERIOD << 3;
-    } else {
-      measurement_period = LOWEST_MEASUREMENT_PERIOD << 4;
-    }
+  process_reading(rtc_t, &sys_time);
 
+  if (n_samples < 4) {
+    measurement_period = LOWEST_MEASUREMENT_PERIOD;
+  } else if (n_samples < 6) {
+    measurement_period = LOWEST_MEASUREMENT_PERIOD << 1;
+  } else if (n_samples < 10) {
+    measurement_period = LOWEST_MEASUREMENT_PERIOD << 2;
+  } else if (n_samples < 14) {
+    measurement_period = LOWEST_MEASUREMENT_PERIOD << 3;
+  } else {
+    measurement_period = LOWEST_MEASUREMENT_PERIOD << 4;
   }
 
 turn_off_interrupt:
@@ -835,7 +856,7 @@ turn_off_interrupt:
         operating_mode = OM_NORMAL;
         (after_init_hook)(after_init_hook_arg);
 
-        switch_interrupts(0);
+        RTC_Linux_SwitchInterrupt(fd, 0);
     
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
@@ -847,7 +868,7 @@ turn_off_interrupt:
         DEBUG_LOG("Could not complete after trim relock due to errors");
         operating_mode = OM_NORMAL;
 
-        switch_interrupts(0);
+        RTC_Linux_SwitchInterrupt(fd, 0);
     
         timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
       }
@@ -855,7 +876,7 @@ turn_off_interrupt:
       break;
 
     case OM_NORMAL:
-      switch_interrupts(0);
+      RTC_Linux_SwitchInterrupt(fd, 0);
     
       timeout_id = SCH_AddTimeoutByDelay((double) measurement_period, measurement_timeout, NULL);
 
@@ -877,7 +898,7 @@ RTC_Linux_TimeInit(void (*after_hook)(void *), void *anything)
 
   operating_mode = OM_INITIAL;
   timeout_id = 0;
-  switch_interrupts(1);
+  RTC_Linux_SwitchInterrupt(fd, 1);
 }
 
 /* ================================================== */
@@ -910,6 +931,33 @@ RTC_Linux_WriteParameters(void)
   return(retval);
 }
 
+time_t
+RTC_Linux_ReadTimeNow(int fd, int utc,
+                      struct timespec *old_sys_cooked,
+                      struct timespec *old_sys_raw)
+{
+  struct rtc_time rtc_raw, rtc_raw_retry;
+  int status;
+
+  /* Retry reading the RTC until both read attempts give the same sec value.
+     This way the race condition is prevented that the RTC has updated itself
+     during the first read operation. */
+  do {
+    status = ioctl(fd, RTC_RD_TIME, &rtc_raw);
+    if (status >= 0) {
+      status = ioctl(fd, RTC_RD_TIME, &rtc_raw_retry);
+    }
+  } while (status >= 0 && rtc_raw.tm_sec != rtc_raw_retry.tm_sec);
+
+  /* Read system clock */
+  if (old_sys_raw)
+    LCL_ReadRawTime(old_sys_raw);
+  if (old_sys_cooked)
+    LCL_ReadCookedTime(old_sys_cooked, NULL);
+
+  return status >= 0 ? t_from_rtc(&rtc_raw, utc) : -1;
+}
+
 /* ================================================== */
 /* Try to set the system clock from the RTC, in the same manner as
    /sbin/hwclock -s would do.  We're not as picky about OS version
@@ -919,12 +967,10 @@ RTC_Linux_WriteParameters(void)
 int
 RTC_Linux_TimePreInit(time_t driftfile_time)
 {
-  int fd, status;
-  struct rtc_time rtc_raw, rtc_raw_retry;
-  struct tm rtc_tm;
   time_t rtc_t;
   double accumulated_error, sys_offset;
   struct timespec new_sys_time, old_sys_time;
+  int fd;
 
   coefs_file_name = CNF_GetRtcFile();
 
@@ -937,66 +983,41 @@ RTC_Linux_TimePreInit(time_t driftfile_time)
     return 0; /* Can't open it, and won't be able to later */
   }
 
-  /* Retry reading the rtc until both read attempts give the same sec value.
-     This way the race condition is prevented that the RTC has updated itself
-     during the first read operation. */
-  do {
-    status = ioctl(fd, RTC_RD_TIME, &rtc_raw);
-    if (status >= 0) {
-      status = ioctl(fd, RTC_RD_TIME, &rtc_raw_retry);
-    }
-  } while (status >= 0 && rtc_raw.tm_sec != rtc_raw_retry.tm_sec);
-
-  /* Read system clock */
-  LCL_ReadCookedTime(&old_sys_time, NULL);
+  rtc_t = RTC_Linux_ReadTimeNow(fd, rtc_on_utc, &old_sys_time, NULL);
 
   close(fd);
 
-  if (status >= 0) {
-    /* Convert to seconds since 1970 */
-    rtc_tm.tm_sec = rtc_raw.tm_sec;
-    rtc_tm.tm_min = rtc_raw.tm_min;
-    rtc_tm.tm_hour = rtc_raw.tm_hour;
-    rtc_tm.tm_mday = rtc_raw.tm_mday;
-    rtc_tm.tm_mon = rtc_raw.tm_mon;
-    rtc_tm.tm_year = rtc_raw.tm_year;
-    
-    rtc_t = t_from_rtc(&rtc_tm);
+  if (rtc_t != (time_t)(-1)) {
 
-    if (rtc_t != (time_t)(-1)) {
-
-      /* Work out approximatation to correct time (to about the
-         nearest second) */
-      if (valid_coefs_from_file) {
-        accumulated_error = file_ref_offset +
-          (rtc_t - file_ref_time) * 1.0e-6 * file_rate_ppm;
-      } else {
-        accumulated_error = 0.0;
-      }
-
-      /* Correct time */
-
-      new_sys_time.tv_sec = rtc_t;
-      /* Average error in the RTC reading */
-      new_sys_time.tv_nsec = 500000000;
-
-      UTI_AddDoubleToTimespec(&new_sys_time, -accumulated_error, &new_sys_time);
-
-      if (new_sys_time.tv_sec < driftfile_time) {
-        LOG(LOGS_WARN, "RTC time before last driftfile modification (ignored)");
-        return 0;
-      }
-
-      sys_offset = UTI_DiffTimespecsToDouble(&old_sys_time, &new_sys_time);
-
-      /* Set system time only if the step is larger than 1 second */
-      if (fabs(sys_offset) >= 1.0) {
-        if (LCL_ApplyStepOffset(sys_offset))
-          LOG(LOGS_INFO, "System time set from RTC");
-      }
+    /* Work out approximation to correct time (to about the
+       nearest second) */
+    if (valid_coefs_from_file) {
+      accumulated_error = file_ref_offset +
+        (rtc_t - file_ref_time) * 1.0e-6 * file_rate_ppm;
     } else {
+      accumulated_error = 0.0;
+    }
+
+    /* Correct time */
+
+    new_sys_time.tv_sec = rtc_t;
+    /* Average error in the RTC reading */
+    new_sys_time.tv_nsec = 500000000;
+
+    UTI_AddDoubleToTimespec(&new_sys_time, -accumulated_error, &new_sys_time);
+
+    if (new_sys_time.tv_sec < driftfile_time) {
+      LOG(LOGS_WARN, "RTC time before last driftfile modification (ignored)");
       return 0;
     }
+
+    sys_offset = UTI_DiffTimespecsToDouble(&old_sys_time, &new_sys_time);
+
+    /* Set system time only if the step is larger than 1 second */
+    if (fabs(sys_offset) >= 1.0) {
+      if (LCL_ApplyStepOffset(sys_offset))
+        LOG(LOGS_INFO, "System time set from RTC");
+    }
   } else {
     return 0;
   }
@@ -1064,7 +1085,7 @@ RTC_Linux_Trim(void)
     /* And start rapid sampling, interrupts on now */
     SCH_RemoveTimeout(timeout_id);
     timeout_id = 0;
-    switch_interrupts(1);
+    RTC_Linux_SwitchInterrupt(fd, 1);
   }
 
   return 1;

rtc_linux.h

@@ -42,4 +42,13 @@ extern int RTC_Linux_Trim(void);
 
 extern void RTC_Linux_CycleLogFile(void);
 
+extern int RTC_Linux_SwitchInterrupt(int fd, int on_off);
+extern int RTC_Linux_CheckInterrupt(int fd);
+extern time_t RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc,
+                                               struct timespec *sys_time_cooked,
+                                               struct timespec *sys_time_raw);
+extern time_t RTC_Linux_ReadTimeNow(int fd, int utc,
+                                    struct timespec *sys_time_cooked,
+                                    struct timespec *sys_time_raw);
+
 #endif /* _GOT_RTC_LINUX_H */

siv.h

@@ -36,6 +36,7 @@
 
 /* Identifiers of SIV algorithms following the IANA AEAD registry */
 typedef enum {
+  AEAD_SIV_INVALID = 0,
   AEAD_AES_SIV_CMAC_256 = 15,
   AEAD_AES_SIV_CMAC_384 = 16,
   AEAD_AES_SIV_CMAC_512 = 17,

siv_nettle.c

@@ -28,18 +28,14 @@
 
 #include "sysincl.h"
 
-#ifdef HAVE_NETTLE_SIV_CMAC
 #include <nettle/siv-cmac.h>
-#else
-#include "siv_nettle_int.c"
-#endif
-
 #ifdef HAVE_NETTLE_SIV_GCM
 #include <nettle/siv-gcm.h>
 #endif
 
 #include "memory.h"
 #include "siv.h"
+#include "util.h"
 
 struct SIV_Instance_Record {
   SIV_Algorithm algorithm;
@@ -163,8 +159,7 @@ SIV_GetMaxNonceLength(SIV_Instance instance)
 int
 SIV_GetTagLength(SIV_Instance instance)
 {
-  if (instance->tag_length < 1 || instance->tag_length > SIV_MAX_TAG_LENGTH)
-    assert(0);
+  BRIEF_ASSERT(instance->tag_length >= 1 && instance->tag_length <= SIV_MAX_TAG_LENGTH);
   return instance->tag_length;
 }
 

siv_nettle_int.c

@@ -1,452 +0,0 @@
-/* This is a single-file implementation of AES-SIV-CMAC-256 based on
-   a patch for GNU Nettle by Nikos Mavrogiannopoulos */
-
-/*
-   AES-CMAC-128 (rfc 4493)
-   Copyright (C) Stefan Metzmacher 2012
-   Copyright (C) Jeremy Allison 2012
-   Copyright (C) Michael Adam 2012
-   Copyright (C) 2017, Red Hat Inc.
-
-   This file is part of GNU Nettle.
-
-   GNU Nettle is free software: you can redistribute it and/or
-   modify it under the terms of either:
-
-     * the GNU Lesser General Public License as published by the Free
-       Software Foundation; either version 3 of the License, or (at your
-       option) any later version.
-
-   or
-
-     * the GNU General Public License as published by the Free
-       Software Foundation; either version 2 of the License, or (at your
-       option) any later version.
-
-   or both in parallel, as here.
-
-   GNU Nettle 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 copies of the GNU General Public License and
-   the GNU Lesser General Public License along with this program.  If
-   not, see http://www.gnu.org/licenses/.
-*/
-/* siv-aes128.c, siv-cmac.c, siv.h
-
-   AES-SIV, RFC5297
-   SIV-CMAC, RFC5297
-
-   Copyright (C) 2017 Nikos Mavrogiannopoulos
-
-   This file is part of GNU Nettle.
-
-   GNU Nettle is free software: you can redistribute it and/or
-   modify it under the terms of either:
-
-     * the GNU Lesser General Public License as published by the Free
-       Software Foundation; either version 3 of the License, or (at your
-       option) any later version.
-
-   or
-
-     * the GNU General Public License as published by the Free
-       Software Foundation; either version 2 of the License, or (at your
-       option) any later version.
-
-   or both in parallel, as here.
-
-   GNU Nettle 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 copies of the GNU General Public License and
-   the GNU Lesser General Public License along with this program.  If
-   not, see http://www.gnu.org/licenses/.
-*/
-/* cmac.h, siv-cmac.h, cmac-aes128.c
-
-   CMAC mode, as specified in RFC4493
-   SIV-CMAC mode, as specified in RFC5297
-   CMAC using AES128 as the underlying cipher.
-
-   Copyright (C) 2017 Red Hat, Inc.
-
-   Contributed by Nikos Mavrogiannopoulos
-
-   This file is part of GNU Nettle.
-
-   GNU Nettle is free software: you can redistribute it and/or
-   modify it under the terms of either:
-
-     * the GNU Lesser General Public License as published by the Free
-       Software Foundation; either version 3 of the License, or (at your
-       option) any later version.
-
-   or
-
-     * the GNU General Public License as published by the Free
-       Software Foundation; either version 2 of the License, or (at your
-       option) any later version.
-
-   or both in parallel, as here.
-
-   GNU Nettle 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 copies of the GNU General Public License and
-   the GNU Lesser General Public License along with this program.  If
-   not, see http://www.gnu.org/licenses/.
-*/
-
-# include "config.h"
-
-#include <assert.h>
-#include <string.h>
-
-#include "nettle/aes.h"
-#include "nettle/ctr.h"
-#include "nettle/macros.h"
-#include "nettle/memxor.h"
-#include "nettle/memops.h"
-
-#include "nettle/nettle-types.h"
-
-/* For SIV, the block size of the block cipher shall be 128 bits. */
-#define SIV_BLOCK_SIZE  16
-#define SIV_DIGEST_SIZE 16
-#define SIV_MIN_NONCE_SIZE 1
-
-/*
- * SIV mode requires the aad and plaintext when building the IV, which
- * prevents streaming processing and it incompatible with the AEAD API.
- */
-
-/* AES_SIV_CMAC_256 */
-struct siv_cmac_aes128_ctx {
-    struct aes128_ctx         cipher;
-    uint8_t s2vk[AES128_KEY_SIZE];
-};
-
-struct cmac128_ctx
-{
-  /* Key */
-  union nettle_block16 K1;
-  union nettle_block16 K2;
-
-  /* MAC state */
-  union nettle_block16 X;
-
-  /* Block buffer */
-  union nettle_block16 block;
-  size_t index;
-};
-
-/* shift one and XOR with 0x87. */
-static void
-_cmac128_block_mulx(union nettle_block16 *dst,
-	   const union nettle_block16 *src)
-{
-  uint64_t b1 = READ_UINT64(src->b);
-  uint64_t b2 = READ_UINT64(src->b+8);
-
-  b1 = (b1 << 1) | (b2 >> 63);
-  b2 <<= 1;
-
-  if (src->b[0] & 0x80)
-    b2 ^= 0x87;
-
-  WRITE_UINT64(dst->b, b1);
-  WRITE_UINT64(dst->b+8, b2);
-}
-
-static void
-cmac128_set_key(struct cmac128_ctx *ctx, const void *cipher,
-		nettle_cipher_func *encrypt)
-{
-  static const uint8_t const_zero[] = {
-    0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00
-  };
-  union nettle_block16 *L = &ctx->block;
-  memset(ctx, 0, sizeof(*ctx));
-
-  /* step 1 - generate subkeys k1 and k2 */
-  encrypt(cipher, 16, L->b, const_zero);
-
-  _cmac128_block_mulx(&ctx->K1, L);
-  _cmac128_block_mulx(&ctx->K2, &ctx->K1);
-}
-
-#define MIN(x,y) ((x)<(y)?(x):(y))
-
-static void
-cmac128_update(struct cmac128_ctx *ctx, const void *cipher,
-	       nettle_cipher_func *encrypt,
-	       size_t msg_len, const uint8_t *msg)
-{
-  union nettle_block16 Y;
-  /*
-   * check if we expand the block
-   */
-  if (ctx->index < 16)
-    {
-      size_t len = MIN(16 - ctx->index, msg_len);
-      memcpy(&ctx->block.b[ctx->index], msg, len);
-      msg += len;
-      msg_len -= len;
-      ctx->index += len;
-    }
-
-  if (msg_len == 0) {
-    /* if it is still the last block, we are done */
-    return;
-  }
-
-  /*
-   * now checksum everything but the last block
-   */
-  memxor3(Y.b, ctx->X.b, ctx->block.b, 16);
-  encrypt(cipher, 16, ctx->X.b, Y.b);
-
-  while (msg_len > 16)
-    {
-      memxor3(Y.b, ctx->X.b, msg, 16);
-      encrypt(cipher, 16, ctx->X.b, Y.b);
-      msg += 16;
-      msg_len -= 16;
-    }
-
-  /*
-   * copy the last block, it will be processed in
-   * cmac128_digest().
-   */
-  memcpy(ctx->block.b, msg, msg_len);
-  ctx->index = msg_len;
-}
-
-static void
-cmac128_digest(struct cmac128_ctx *ctx, const void *cipher,
-	       nettle_cipher_func *encrypt,
-	       unsigned length,
-	       uint8_t *dst)
-{
-  union nettle_block16 Y;
-
-  memset(ctx->block.b+ctx->index, 0, sizeof(ctx->block.b)-ctx->index);
-
-  /* re-use ctx->block for memxor output */
-  if (ctx->index < 16)
-    {
-      ctx->block.b[ctx->index] = 0x80;
-      memxor(ctx->block.b, ctx->K2.b, 16);
-    }
-  else
-    {
-      memxor(ctx->block.b, ctx->K1.b, 16);
-    }
-
-  memxor3(Y.b, ctx->block.b, ctx->X.b, 16);
-
-  assert(length <= 16);
-  if (length == 16)
-    {
-      encrypt(cipher, 16, dst, Y.b);
-    }
-  else
-    {
-      encrypt(cipher, 16, ctx->block.b, Y.b);
-      memcpy(dst, ctx->block.b, length);
-    }
-
-  /* reset state for re-use */
-  memset(&ctx->X, 0, sizeof(ctx->X));
-  ctx->index = 0;
-}
-
-
-#define CMAC128_CTX(type) \
-  { struct cmac128_ctx ctx; type cipher; }
-
-/* NOTE: Avoid using NULL, as we don't include anything defining it. */
-#define CMAC128_SET_KEY(self, set_key, encrypt, cmac_key)	\
-  do {								\
-    (set_key)(&(self)->cipher, (cmac_key));			\
-    if (0) (encrypt)(&(self)->cipher, ~(size_t) 0,		\
-		     (uint8_t *) 0, (const uint8_t *) 0);	\
-    cmac128_set_key(&(self)->ctx, &(self)->cipher,		\
-		(nettle_cipher_func *) (encrypt));		\
-  } while (0)
-
-#define CMAC128_UPDATE(self, encrypt, length, src)		\
-  cmac128_update(&(self)->ctx, &(self)->cipher,			\
-	      (nettle_cipher_func *)encrypt, (length), (src))
-
-#define CMAC128_DIGEST(self, encrypt, length, digest)		\
-  (0 ? (encrypt)(&(self)->cipher, ~(size_t) 0,			\
-		 (uint8_t *) 0, (const uint8_t *) 0)		\
-     : cmac128_digest(&(self)->ctx, &(self)->cipher,		\
-		  (nettle_cipher_func *) (encrypt),		\
-		  (length), (digest)))
-
-struct cmac_aes128_ctx CMAC128_CTX(struct aes128_ctx);
-
-static void
-cmac_aes128_set_key(struct cmac_aes128_ctx *ctx, const uint8_t *key)
-{
-  CMAC128_SET_KEY(ctx, aes128_set_encrypt_key, aes128_encrypt, key);
-}
-
-static void
-cmac_aes128_update (struct cmac_aes128_ctx *ctx,
-		   size_t length, const uint8_t *data)
-{
-  CMAC128_UPDATE (ctx, aes128_encrypt, length, data);
-}
-
-static void
-cmac_aes128_digest(struct cmac_aes128_ctx *ctx,
-		  size_t length, uint8_t *digest)
-{
-  CMAC128_DIGEST(ctx, aes128_encrypt, length, digest);
-}
-
-static const uint8_t const_one[] = {
-	0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x01
-};
-
-static const uint8_t const_zero[] = {
-	0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00
-};
-
-static
-void _siv_s2v(nettle_set_key_func *cmac_set_key,
-	      nettle_hash_update_func *cmac_update,
-	      nettle_hash_digest_func *cmac_digest,
-	      size_t cmac_ctx_size,
-	      const uint8_t *s2vk, size_t alength, const uint8_t *adata,
-              size_t nlength, const uint8_t *nonce,
-              size_t plength, const uint8_t *pdata,
-              uint8_t *v)
-{
-  uint8_t ctx[sizeof(struct cmac128_ctx)+sizeof(struct aes_ctx)];
-  union nettle_block16 D, S, T;
-
-  assert(cmac_ctx_size <= sizeof (ctx));
-
-  cmac_set_key(ctx, s2vk);
-
-  if (nlength == 0 && alength == 0) {
-    cmac_update(ctx, 16, const_one);
-    cmac_digest(ctx, 16, v);
-    return;
-  }
-
-  cmac_update(ctx, 16, const_zero);
-  cmac_digest(ctx, 16, D.b);
-
-  if (1) {
-    _cmac128_block_mulx(&D, &D);
-    cmac_update(ctx, alength, adata);
-    cmac_digest(ctx, 16, S.b);
-
-    memxor(D.b, S.b, 16);
-  }
-
-  if (nlength > 0) {
-    _cmac128_block_mulx(&D, &D);
-    cmac_update(ctx, nlength, nonce);
-    cmac_digest(ctx, 16, S.b);
-
-    memxor(D.b, S.b, 16);
-  }
-
-  /* Sn */
-  if (plength >= 16) {
-    cmac_update(ctx, plength-16, pdata);
-
-    pdata += plength-16;
-
-    memxor3(T.b, pdata, D.b, 16);
-  } else {
-    union nettle_block16 pad;
-
-    _cmac128_block_mulx(&T, &D);
-    memcpy(pad.b, pdata, plength);
-    pad.b[plength] = 0x80;
-    if (plength+1 < 16)
-      memset(&pad.b[plength+1], 0, 16-plength-1);
-
-    memxor(T.b, pad.b, 16);
-  }
-
-  cmac_update(ctx, 16, T.b);
-  cmac_digest(ctx, 16, v);
-}
-
-static void
-siv_cmac_aes128_set_key(struct siv_cmac_aes128_ctx *ctx, const uint8_t *key)
-{
-  memcpy(ctx->s2vk, key, 16);
-  aes128_set_encrypt_key(&ctx->cipher, key+16);
-}
-
-static void
-siv_cmac_aes128_encrypt_message(struct siv_cmac_aes128_ctx *ctx,
-				size_t nlength, const uint8_t *nonce,
-				size_t alength, const uint8_t *adata,
-				size_t clength, uint8_t *dst, const uint8_t *src)
-{
-  union nettle_block16 siv;
-  size_t slength;
-
-  assert (clength >= SIV_DIGEST_SIZE);
-  slength = clength - SIV_DIGEST_SIZE;
-
-  /* create CTR nonce */
-  _siv_s2v((nettle_set_key_func*)cmac_aes128_set_key,
-	   (nettle_hash_update_func*)cmac_aes128_update,
-	   (nettle_hash_digest_func*)cmac_aes128_digest,
-	   sizeof(struct cmac_aes128_ctx), ctx->s2vk, alength, adata,
-	   nlength, nonce, slength, src, siv.b);
-  memcpy(dst, siv.b, SIV_DIGEST_SIZE);
-  siv.b[8] &= ~0x80;
-  siv.b[12] &= ~0x80;
-
-  ctr_crypt(&ctx->cipher, (nettle_cipher_func *)aes128_encrypt, AES_BLOCK_SIZE,
-            siv.b, slength, dst+SIV_DIGEST_SIZE, src);
-}
-
-static int
-siv_cmac_aes128_decrypt_message(struct siv_cmac_aes128_ctx *ctx,
-				size_t nlength, const uint8_t *nonce,
-				size_t alength, const uint8_t *adata,
-				size_t mlength, uint8_t *dst, const uint8_t *src)
-{
-  union nettle_block16 siv;
-  union nettle_block16 ctr;
-
-  memcpy(ctr.b, src, SIV_DIGEST_SIZE);
-  ctr.b[8] &= ~0x80;
-  ctr.b[12] &= ~0x80;
-
-  ctr_crypt(&ctx->cipher, (nettle_cipher_func *)aes128_encrypt, AES_BLOCK_SIZE,
-            ctr.b, mlength, dst, src+SIV_DIGEST_SIZE);
-
-  /* create CTR nonce */
-  _siv_s2v((nettle_set_key_func*)cmac_aes128_set_key,
-	   (nettle_hash_update_func*)cmac_aes128_update,
-	   (nettle_hash_digest_func*)cmac_aes128_digest,
-	   sizeof(struct cmac_aes128_ctx), ctx->s2vk, alength, adata,
-	   nlength, nonce, mlength, dst, siv.b);
-
-  return memeql_sec(siv.b, src, SIV_DIGEST_SIZE);
-}
-

socket.c

@@ -213,12 +213,25 @@ get_reusable_socket(int type, IPSockAddr *spec)
 /* ================================================== */
 
 #if defined(SOCK_CLOEXEC) || defined(SOCK_NONBLOCK)
+
+static int
+get_default_inet_domain(void)
+{
+#ifdef FEAT_IPV6
+  if (!ip4_enabled && ip6_enabled)
+    return AF_INET6;
+#endif
+  return AF_INET;
+}
+
+/* ================================================== */
+
 static int
 check_socket_flag(int sock_flag, int fd_flag, int fs_flag)
 {
   int sock_fd, fd_flags, fs_flags;
 
-  sock_fd = socket(AF_INET, SOCK_DGRAM | sock_flag, 0);
+  sock_fd = socket(get_default_inet_domain(), SOCK_DGRAM | sock_flag, 0);
   if (sock_fd < 0)
     return 0;
 
@@ -526,7 +539,7 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *ifac
   else if (remote_addr)
     family = remote_addr->ip_addr.family;
   else
-    family = IPADDR_INET4;
+    family = !ip4_enabled && ip6_enabled ? IPADDR_INET6 : IPADDR_INET4;
 
   switch (family) {
     case IPADDR_INET4:
@@ -590,25 +603,40 @@ error:
 
 /* ================================================== */
 
+static socklen_t
+set_unix_sockaddr(struct sockaddr_un *sun, const char *addr)
+{
+  size_t len = strlen(addr);
+
+  if (len + 1 > sizeof (sun->sun_path)) {
+    DEBUG_LOG("Unix socket path %s too long", addr);
+    return 0;
+  }
+
+  memset(sun, 0, sizeof (*sun));
+  sun->sun_family = AF_UNIX;
+  memcpy(sun->sun_path, addr, len);
+
+  return offsetof(struct sockaddr_un, sun_path) + len + 1;
+}
+
+/* ================================================== */
+
 static int
 bind_unix_address(int sock_fd, const char *addr, int flags)
 {
   union sockaddr_all saddr;
+  socklen_t saddr_len;
 
-  memset(&saddr, 0, sizeof (saddr));
-
-  if (snprintf(saddr.un.sun_path, sizeof (saddr.un.sun_path), "%s", addr) >=
-      sizeof (saddr.un.sun_path)) {
-    DEBUG_LOG("Unix socket path %s too long", addr);
+  saddr_len = set_unix_sockaddr(&saddr.un, addr);
+  if (saddr_len == 0)
     return 0;
-  }
-  saddr.un.sun_family = AF_UNIX;
 
   if (unlink(addr) < 0)
     DEBUG_LOG("Could not remove %s : %s", addr, strerror(errno));
 
   /* PRV_BindSocket() doesn't support Unix sockets yet */
-  if (bind(sock_fd, &saddr.sa, sizeof (saddr.un)) < 0) {
+  if (bind(sock_fd, &saddr.sa, saddr_len) < 0) {
     DEBUG_LOG("Could not bind Unix socket to %s : %s", addr, strerror(errno));
     return 0;
   }
@@ -628,17 +656,13 @@ static int
 connect_unix_address(int sock_fd, const char *addr)
 {
   union sockaddr_all saddr;
+  socklen_t saddr_len;
 
-  memset(&saddr, 0, sizeof (saddr));
-
-  if (snprintf(saddr.un.sun_path, sizeof (saddr.un.sun_path), "%s", addr) >=
-      sizeof (saddr.un.sun_path)) {
-    DEBUG_LOG("Unix socket path %s too long", addr);
+  saddr_len = set_unix_sockaddr(&saddr.un, addr);
+  if (saddr_len == 0)
     return 0;
-  }
-  saddr.un.sun_family = AF_UNIX;
 
-  if (connect(sock_fd, &saddr.sa, sizeof (saddr.un)) < 0) {
+  if (connect(sock_fd, &saddr.sa, saddr_len) < 0) {
     DEBUG_LOG("Could not connect Unix socket to %s : %s", addr, strerror(errno));
     return 0;
   }
@@ -853,8 +877,10 @@ static int
 process_header(struct msghdr *msg, int msg_length, int sock_fd, int flags,
                SCK_Message *message)
 {
+  int r = 1, path_len, max_path_len;
   struct cmsghdr *cmsg;
-  int r = 1;
+
+  init_message_addresses(message, SCK_ADDR_UNSPEC);
 
   if (msg->msg_namelen <= sizeof (union sockaddr_all) &&
       msg->msg_namelen > sizeof (((struct sockaddr *)msg->msg_name)->sa_family)) {
@@ -867,18 +893,23 @@ process_header(struct msghdr *msg, int msg_length, int sock_fd, int flags,
         SCK_SockaddrToIPSockAddr(msg->msg_name, msg->msg_namelen, &message->remote_addr.ip);
         break;
       case AF_UNIX:
+        /* Make sure the path is terminated by '\0' */
+        max_path_len = sizeof (((struct sockaddr_un *)msg->msg_name)->sun_path);
+        path_len = strnlen(((struct sockaddr_un *)msg->msg_name)->sun_path, max_path_len);
+        if (path_len >= max_path_len) {
+          DEBUG_LOG("Unterminated path");
+          r = 0;
+          break;
+        }
         init_message_addresses(message, SCK_ADDR_UNIX);
         message->remote_addr.path = ((struct sockaddr_un *)msg->msg_name)->sun_path;
         break;
       default:
-        init_message_addresses(message, SCK_ADDR_UNSPEC);
         DEBUG_LOG("Unexpected address");
         r = 0;
         break;
     }
   } else {
-    init_message_addresses(message, SCK_ADDR_UNSPEC);
-
     if (msg->msg_namelen > sizeof (union sockaddr_all)) {
       DEBUG_LOG("Truncated source address");
       r = 0;
@@ -1050,9 +1081,8 @@ receive_messages(int sock_fd, int flags, int max_messages, int *num_messages)
   n = ARR_GetSize(recv_headers);
   n = MIN(n, max_messages);
 
-  if (n < 1 || n > MAX_RECV_MESSAGES ||
-      n > ARR_GetSize(recv_messages) || n > ARR_GetSize(recv_sck_messages))
-    assert(0);
+  BRIEF_ASSERT(n >= 1 && n <= MAX_RECV_MESSAGES &&
+               n <= ARR_GetSize(recv_messages) && n <= ARR_GetSize(recv_sck_messages));
 
   recv_flags = get_recv_flags(flags);
 
@@ -1142,14 +1172,9 @@ send_message(int sock_fd, SCK_Message *message, int flags)
                                            (struct sockaddr *)&saddr, sizeof (saddr));
       break;
     case SCK_ADDR_UNIX:
-      memset(&saddr, 0, sizeof (saddr));
-      if (snprintf(saddr.un.sun_path, sizeof (saddr.un.sun_path), "%s",
-                   message->remote_addr.path) >= sizeof (saddr.un.sun_path)) {
-        DEBUG_LOG("Unix socket path %s too long", message->remote_addr.path);
+      saddr_len = set_unix_sockaddr(&saddr.un, message->remote_addr.path);
+      if (saddr_len == 0)
         return 0;
-      }
-      saddr.un.sun_family = AF_UNIX;
-      saddr_len = sizeof (saddr.un);
       break;
     default:
       assert(0);

sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2023
+ * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2024
  * 
  * 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
@@ -66,10 +66,10 @@ struct SelectInfo {
 /* This enum contains the flag values that are used to label
    each source */
 typedef enum {
-  SRC_OK,               /* OK so far, not a final status! */
+  SRC_OK = 0,           /* OK so far, not a final status! */
   SRC_UNSELECTABLE,     /* Has noselect option set */
-  SRC_UNSYNCHRONISED,   /* Provides samples but not unsynchronised */
   SRC_BAD_STATS,        /* Doesn't have valid stats data */
+  SRC_UNSYNCHRONISED,   /* Provides samples, but not synchronised */
   SRC_BAD_DISTANCE,     /* Has root distance longer than allowed maximum */
   SRC_JITTERY,          /* Had std dev larger than allowed maximum */
   SRC_WAITS_STATS,      /* Others have bad stats, selection postponed */
@@ -144,9 +144,9 @@ 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;
+  /* Flags indicating which status was already reported for
+     the source since the last change of the system peer */
+  char reported_status[SRC_SELECTED + 1];
 };
 
 /* ================================================== */
@@ -177,6 +177,8 @@ static int reported_no_majority;  /* Flag to avoid repeated log message
 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) */
+static int forced_first_report;   /* Flag to allow one failed selection to be
+                                     logged before a successful selection */
 
 /* Score needed to replace the currently selected source */
 #define SCORE_LIMIT 10.0
@@ -204,8 +206,7 @@ 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 unselect_selected_source(LOG_Severity severity, const char *format, ...);
 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);
@@ -320,9 +321,8 @@ void SRC_DestroyInstance(SRC_Instance instance)
     last_updated_inst = NULL;
 
   assert(initialised);
-  if (instance->index < 0 || instance->index >= n_sources ||
-      instance != sources[instance->index])
-    assert(0);
+  BRIEF_ASSERT(instance->index >= 0 && instance->index < n_sources &&
+               instance == sources[instance->index]);
 
   SST_DeleteInstance(instance->stats);
   dead_index = instance->index;
@@ -338,7 +338,7 @@ void SRC_DestroyInstance(SRC_Instance instance)
   if (selected_source_index > dead_index)
     --selected_source_index;
   else if (selected_source_index == dead_index)
-    unselect_selected_source(LOGS_INFO, NULL, NULL);
+    unselect_selected_source(LOGS_INFO, NULL);
 
   SRC_SelectSource(NULL);
 }
@@ -358,8 +358,8 @@ SRC_ResetInstance(SRC_Instance instance)
   instance->stratum = 0;
   instance->leap = LEAP_Unsynchronised;
   instance->leap_vote = 0;
-  instance->reported_falseticker = 0;
 
+  memset(instance->reported_status, 0, sizeof (instance->reported_status));
   memset(&instance->sel_info, 0, sizeof (instance->sel_info));
 
   SST_ResetInstance(instance->stats);
@@ -524,11 +524,6 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
   if (inst->reachability_size < SOURCE_REACH_BITS)
       inst->reachability_size++;
 
-  if (!reachable && inst->index == selected_source_index) {
-    /* Try to select a better source */
-    SRC_SelectSource(NULL);
-  }
-
   /* Check if special reference update mode failed */
   if (REF_GetMode() != REF_ModeNormal && special_mode_end()) {
     REF_SetUnsynchronised();
@@ -537,6 +532,10 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
   /* Try to replace unreachable NTP sources */
   if (inst->reachability == 0 && inst->reachability_size == SOURCE_REACH_BITS)
     handle_bad_source(inst);
+
+  /* Source selection can change with unreachable sources */
+  if (inst->reachability == 0)
+    SRC_SelectSource(NULL);
 }
 
 /* ================================================== */
@@ -619,20 +618,45 @@ update_sel_options(void)
 
 /* ================================================== */
 
+FORMAT_ATTRIBUTE_PRINTF(2, 3)
 static void
-log_selection_message(LOG_Severity severity, const char *format, const char *arg)
+log_selection_message(LOG_Severity severity, const char *format, ...)
 {
+  char buf[256];
+  va_list ap;
+
   if (REF_GetMode() != REF_ModeNormal)
     return;
-  LOG(severity, format, arg);
+
+  va_start(ap, format);
+  vsnprintf(buf, sizeof (buf), format, ap);
+  va_end(ap);
+
+  LOG(severity, "%s", buf);
 }
 
 /* ================================================== */
 
+FORMAT_ATTRIBUTE_PRINTF(3, 4)
 static void
-log_selection_source(LOG_Severity severity, const char *format, SRC_Instance inst)
+log_selection_source(LOG_Severity severity, SRC_Instance inst, const char *format, ...)
 {
-  char buf[320], *name, *ntp_name;
+  char buf[320], buf2[256], *name, *ntp_name, *s;
+  va_list ap;
+
+  if (REF_GetMode() != REF_ModeNormal)
+    return;
+
+  va_start(ap, format);
+  vsnprintf(buf2, sizeof (buf2), format, ap);
+  va_end(ap);
+
+  /* Replace ## with %s in the formatted string to be the source name */
+  s = strstr(buf2, "##");
+  if (!s || strchr(buf2, '%'))
+    return;
+  s[0] = '%';
+  s[1] = 's';
 
   name = source_to_string(inst);
   ntp_name = inst->type == SRC_NTP ? NSR_GetName(inst->ip_addr) : NULL;
@@ -642,7 +666,9 @@ log_selection_source(LOG_Severity severity, const char *format, SRC_Instance ins
   else
     snprintf(buf, sizeof (buf), "%s", name);
 
-  log_selection_message(severity, format, buf);
+  LOG(severity, buf2, buf);
+
+  inst->reported_status[inst->status] = 1;
 }
 
 /* ================================================== */
@@ -685,7 +711,7 @@ source_to_string(SRC_Instance inst)
 /* ================================================== */
 
 static void
-mark_source(SRC_Instance inst, SRC_Status status)
+set_source_status(SRC_Instance inst, SRC_Status status)
 {
   struct timespec now;
 
@@ -730,6 +756,43 @@ mark_source(SRC_Instance inst, SRC_Status status)
 
 /* ================================================== */
 
+static void
+mark_source(SRC_Instance inst, SRC_Status status)
+{
+  set_source_status(inst, status);
+
+  BRIEF_ASSERT(status >= SRC_OK && status < sizeof (inst->reported_status));
+
+  if (!inst->reported_status[status]) {
+    switch (status) {
+      case SRC_BAD_DISTANCE:
+        if (inst->bad < BAD_HANDLE_THRESHOLD)
+          break;
+        log_selection_source(LOGS_WARN, inst,
+                             "Root distance of ## exceeds maxdistance of %.3f seconds",
+                             max_distance);
+        break;
+      case SRC_JITTERY:
+        if (inst->bad < BAD_HANDLE_THRESHOLD)
+          break;
+        log_selection_source(LOGS_WARN, inst,
+                             "Jitter of ## exceeds maxjitter of %.3f seconds",
+                             max_jitter);
+        break;
+      case SRC_FALSETICKER:
+        log_selection_source(LOGS_WARN, inst, "Detected falseticker ##");
+        break;
+      case SRC_SELECTED:
+        log_selection_source(LOGS_INFO, inst, "Selected source ##");
+        break;
+      default:
+        break;
+    }
+  }
+}
+
+/* ================================================== */
+
 static void
 mark_ok_sources(SRC_Status status)
 {
@@ -738,7 +801,8 @@ mark_ok_sources(SRC_Status status)
   for (i = 0; i < n_sources; i++) {
     if (sources[i]->status != SRC_OK)
       continue;
-    mark_source(sources[i], status);
+    /* Don't log the status in this case (multiple sources at once) */
+    set_source_status(sources[i], status);
   }
 }
 
@@ -748,16 +812,24 @@ mark_ok_sources(SRC_Status status)
    call providing a message or selection of another source, which resets the
    report_selection_loss flag. */
 
+FORMAT_ATTRIBUTE_PRINTF(2, 3)
 static void
-unselect_selected_source(LOG_Severity severity, const char *format, const char *arg)
+unselect_selected_source(LOG_Severity severity, const char *format, ...)
 {
+  char buf[256];
+  va_list ap;
+
   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);
+    va_start(ap, format);
+    vsnprintf(buf, sizeof (buf), format, ap);
+    va_end(ap);
+
+    log_selection_message(severity, "%s", buf);
     report_selection_loss = 0;
   }
 }
@@ -862,7 +934,8 @@ SRC_SelectSource(SRC_Instance updated_inst)
   struct SelectInfo *si;
   struct timespec now, ref_time;
   int i, j, j1, j2, index, sel_prefer, n_endpoints, n_sel_sources, sel_req_source;
-  int n_badstats_sources, max_sel_reach, max_sel_reach_size, max_badstat_reach;
+  int max_badstat_reach, max_badstat_reach_size, n_badstats_sources;
+  int max_sel_reach, max_sel_reach_size, n_unreach_sources;
   int depth, best_depth, trust_depth, best_trust_depth, n_sel_trust_sources;
   int combined, stratum, min_stratum, max_score_index;
   int orphan_stratum, orphan_source;
@@ -879,7 +952,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
   }
 
   if (n_sources == 0) {
-    unselect_selected_source(LOGS_INFO, "Can't synchronise: no sources", NULL);
+    unselect_selected_source(LOGS_WARN, "Can't synchronise: no sources");
     return;
   }
 
@@ -891,9 +964,10 @@ SRC_SelectSource(SRC_Instance updated_inst)
   n_endpoints = 0;
   n_sel_sources = n_sel_trust_sources = 0;
   n_badstats_sources = 0;
+  n_unreach_sources = 0;
   sel_req_source = 0;
   max_sel_reach = max_badstat_reach = 0;
-  max_sel_reach_size = 0;
+  max_sel_reach_size = max_badstat_reach_size = 0;
   max_reach_sample_ago = 0.0;
 
   for (i = 0; i < n_sources; i++) {
@@ -913,11 +987,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
     }
 
-    /* Ignore sources which are not synchronised */
-    if (sources[i]->leap == LEAP_Unsynchronised) {
-      mark_source(sources[i], SRC_UNSYNCHRONISED);
-      continue;
-    }
+    /* Count unreachable sources for a warning message */
+    if (sources[i]->reachability == 0)
+      n_unreach_sources++;
 
     si = &sources[i]->sel_info;
     SST_GetSelectionData(sources[i]->stats, &now,
@@ -930,6 +1002,14 @@ SRC_SelectSource(SRC_Instance updated_inst)
       mark_source(sources[i], SRC_BAD_STATS);
       if (max_badstat_reach < sources[i]->reachability)
         max_badstat_reach = sources[i]->reachability;
+      if (max_badstat_reach_size < sources[i]->reachability_size)
+        max_badstat_reach_size = sources[i]->reachability_size;
+      continue;
+    }
+
+    /* Ignore sources which are not synchronised */
+    if (sources[i]->leap == LEAP_Unsynchronised) {
+      mark_source(sources[i], SRC_UNSYNCHRONISED);
       continue;
     }
 
@@ -1064,13 +1144,22 @@ 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);
+    unselect_selected_source(LOGS_INFO, NULL);
     return;
   }
 
+  /* Wait for a source to have full reachability register to allow one
+     failed selection to be logged before first successful selection */
+  if (!forced_first_report &&
+      MAX(max_sel_reach_size, max_badstat_reach_size) == SOURCE_REACH_BITS) {
+    report_selection_loss = 1;
+    forced_first_report = 1;
+  }
+
   if (n_endpoints == 0) {
     /* No sources provided valid endpoints */
-    unselect_selected_source(LOGS_INFO, "Can't synchronise: no selectable sources", NULL);
+    unselect_selected_source(LOGS_WARN, "Can't synchronise: no selectable sources"
+                                        " (%d unreachable sources)", n_unreach_sources);
     return;
   }
 
@@ -1144,12 +1233,23 @@ SRC_SelectSource(SRC_Instance updated_inst)
   assert(depth == 0 && trust_depth == 0);
   assert(2 * n_sel_sources == n_endpoints);
 
-  if ((best_trust_depth == 0 && best_depth <= n_sel_sources / 2) ||
-      (best_trust_depth > 0 && best_trust_depth <= n_sel_trust_sources / 2)) {
+  if (best_trust_depth > 0) {
+    best_depth = best_trust_depth;
+    n_sel_sources = n_sel_trust_sources;
+  }
+
+  if (best_depth <= n_sel_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);
+      if (best_depth < 2)
+        log_selection_message(LOGS_WARN, "%s (no agreement among %d %ssources)",
+                              "Can't synchronise: no majority", n_sel_sources,
+                              best_trust_depth > 0 ? "trusted " : "");
+      else
+        log_selection_message(LOGS_WARN, "%s (only %d of %d %ssources agree)",
+                              "Can't synchronise: no majority", best_depth,
+                              n_sel_sources, best_trust_depth > 0 ? "trusted " : "");
       reported_no_majority = 1;
       report_selection_loss = 0;
     }
@@ -1200,15 +1300,11 @@ 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()) {
-    unselect_selected_source(LOGS_INFO, "Can't synchronise: %s selectable sources",
+    unselect_selected_source(LOGS_WARN, "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);
@@ -1317,23 +1413,23 @@ 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) {
-      unselect_selected_source(LOGS_INFO, NULL, NULL);
+      unselect_selected_source(LOGS_INFO, NULL);
       mark_ok_sources(SRC_WAITS_UPDATE);
       return;
     }
 
     selected_source_index = max_score_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;
+      memset(sources[i]->reported_status, 0, sizeof (sources[i]->reported_status));
     }
 
     reported_no_majority = 0;
     report_selection_loss = 0;
+    forced_first_report = 1;
   }
 
   mark_source(sources[selected_source_index], SRC_SELECTED);
@@ -1796,10 +1892,10 @@ get_status_char(SRC_Status status)
   switch (status) {
     case SRC_UNSELECTABLE:
       return 'N';
-    case SRC_UNSYNCHRONISED:
-      return 's';
     case SRC_BAD_STATS:
       return 'M';
+    case SRC_UNSYNCHRONISED:
+      return 's';
     case SRC_BAD_DISTANCE:
       return 'd';
     case SRC_JITTERY:

sourcestats.c

@@ -549,9 +549,9 @@ SST_DoNewRegression(SST_Stats inst)
         sd_weight += (peer_distances[i] - min_distance) / sd;
       weights[i] = SQUARE(sd_weight);
     }
-  }
 
-  correct_asymmetry(inst, times_back, offsets);
+    correct_asymmetry(inst, times_back, offsets);
+  }
 
   inst->regression_ok = RGR_FindBestRegression(times_back + inst->runs_samples,
                                          offsets + inst->runs_samples, weights,

stubs.c

@@ -49,66 +49,6 @@
 #include "sched.h"
 #include "util.h"
 
-#if defined(FEAT_NTP) && !defined(FEAT_ASYNCDNS)
-
-/* This is a blocking implementation used when asynchronous resolving is not available */
-
-struct DNS_Async_Instance {
-  const char *name;
-  DNS_NameResolveHandler handler;
-  void *arg;
-  int pipe[2];
-};
-
-static void
-resolve_name(int fd, int event, void *anything)
-{
-  struct DNS_Async_Instance *inst;
-  IPAddr addrs[DNS_MAX_ADDRESSES];
-  DNS_Status status;
-  int i;
-
-  inst = (struct DNS_Async_Instance *)anything;
-
-  SCH_RemoveFileHandler(inst->pipe[0]);
-  close(inst->pipe[0]);
-  close(inst->pipe[1]);
-
-  status = PRV_Name2IPAddress(inst->name, addrs, DNS_MAX_ADDRESSES);
-
-  for (i = 0; status == DNS_Success && i < DNS_MAX_ADDRESSES &&
-       addrs[i].family != IPADDR_UNSPEC; i++)
-    ;
-
-  (inst->handler)(status, i, addrs, inst->arg);
-
-  Free(inst);
-}
-
-void
-DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *anything)
-{
-  struct DNS_Async_Instance *inst;
-
-  inst = MallocNew(struct DNS_Async_Instance);
-  inst->name = name;
-  inst->handler = handler;
-  inst->arg = anything;
-
-  if (pipe(inst->pipe))
-    LOG_FATAL("pipe() failed");
-
-  UTI_FdSetCloexec(inst->pipe[0]);
-  UTI_FdSetCloexec(inst->pipe[1]);
-
-  SCH_AddFileHandler(inst->pipe[0], SCH_FILE_INPUT, resolve_name, inst);
-
-  if (write(inst->pipe[1], "", 1) < 0)
-    ;
-}
-
-#endif /* !FEAT_ASYNCDNS */
-
 #ifndef FEAT_CMDMON
 
 void
@@ -144,253 +84,6 @@ MNL_Finalise(void)
 
 #endif /* !FEAT_CMDMON */
 
-#ifndef FEAT_NTP
-
-void
-NCR_AddBroadcastDestination(NTP_Remote_Address *addr, int interval)
-{
-}
-
-void
-NCR_Initialise(void)
-{
-}
-
-void
-NCR_Finalise(void)
-{
-}
-
-int
-NCR_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all)
-{
-  return 1;
-}
-
-int
-NCR_CheckAccessRestriction(IPAddr *ip_addr)
-{
-  return 0;
-}
-
-void
-NIO_Initialise(void)
-{
-}
-
-void
-NIO_Finalise(void)
-{
-}
-
-void
-NSR_Initialise(void)
-{
-}
-
-void
-NSR_Finalise(void)
-{
-}
-
-NSR_Status
-NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
-              SourceParameters *params, uint32_t *conf_id)
-{
-  return NSR_TooManySources;
-}
-
-NSR_Status
-NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
-                    SourceParameters *params, uint32_t *conf_id)
-{
-  return NSR_TooManySources;
-}
-
-const char *
-NSR_StatusToString(NSR_Status status)
-{
-  return "NTP not supported";
-}
-
-NSR_Status
-NSR_RemoveSource(IPAddr *address)
-{
-  return NSR_NoSuchSource;
-}
-
-void
-NSR_RemoveSourcesById(uint32_t conf_id)
-{
-}
-
-void
-NSR_RemoveAllSources(void)
-{
-}
-
-void
-NSR_HandleBadSource(IPAddr *address)
-{
-}
-
-void
-NSR_RefreshAddresses(void)
-{
-}
-
-char *
-NSR_GetName(IPAddr *address)
-{
-  return NULL;
-}
-
-void
-NSR_SetSourceResolvingEndHandler(NSR_SourceResolvingEndHandler handler)
-{
-  if (handler)
-    (handler)();
-}
-
-void
-NSR_ResolveSources(void)
-{
-}
-
-void NSR_StartSources(void)
-{
-}
-
-void NSR_AutoStartSources(void)
-{
-}
-
-int
-NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples,
-                        IPAddr *mask, IPAddr *address)
-{
-  return 0;
-}
-
-uint32_t
-NSR_GetLocalRefid(IPAddr *address)
-{
-  return 0;
-}
-
-int
-NSR_SetConnectivity(IPAddr *mask, IPAddr *address, SRC_Connectivity connectivity)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMinpoll(IPAddr *address, int new_minpoll)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMaxpoll(IPAddr *address, int new_maxpoll)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMaxdelay(IPAddr *address, double new_max_delay)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMaxdelayratio(IPAddr *address, double new_max_delay_ratio)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMaxdelaydevratio(IPAddr *address, double new_max_delay_dev_ratio)
-{
-  return 0;
-}
-
-int
-NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum)
-{
-  return 0;
-}
-
-int
-NSR_ModifyPolltarget(IPAddr *address, int new_poll_target)
-{
-  return 0;
-}
-
-void
-NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
-{
-  memset(report, 0, sizeof (*report));
-}
-  
-int
-NSR_GetAuthReport(IPAddr *address, RPT_AuthReport *report)
-{
-  return 0;
-}
-
-int
-NSR_GetNTPReport(RPT_NTPReport *report)
-{
-  return 0;
-}
-
-void
-NSR_GetActivityReport(RPT_ActivityReport *report)
-{
-  memset(report, 0, sizeof (*report));
-}
-
-void
-NSR_DumpAuthData(void)
-{
-}
-
-#ifndef FEAT_CMDMON
-
-void
-CLG_Initialise(void)
-{
-}
-
-void
-CLG_Finalise(void)
-{
-}
-
-void
-DNS_SetAddressFamily(int family)
-{
-}
-
-DNS_Status
-DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
-{
-  return DNS_Failure;
-}
-
-void
-KEY_Initialise(void)
-{
-}
-
-void
-KEY_Finalise(void)
-{
-}
-
-#endif /* !FEAT_CMDMON */
-#endif /* !FEAT_NTP */
-
 #ifndef FEAT_REFCLOCK
 void
 RCL_Initialise(void)
@@ -419,6 +112,12 @@ RCL_ReportSource(RPT_SourceReport *report, struct timespec *now)
   memset(report, 0, sizeof (*report));
 }
 
+int
+RCL_ModifyOffset(uint32_t ref_id, double offset)
+{
+  return 0;
+}
+
 #endif /* !FEAT_REFCLOCK */
 
 #ifndef FEAT_SIGND

sys_linux.c

@@ -38,6 +38,12 @@
 #include <poll.h>
 #endif
 
+#ifdef HAVE_LINUX_TIMESTAMPING
+#include <linux/sockios.h>
+#include <linux/ethtool.h>
+#include <net/if.h>
+#endif
+
 #ifdef FEAT_SCFILTER
 #include <sys/prctl.h>
 #include <seccomp.h>
@@ -48,9 +54,6 @@
 #ifdef FEAT_RTC
 #include <linux/rtc.h>
 #endif
-#ifdef HAVE_LINUX_TIMESTAMPING
-#include <linux/sockios.h>
-#endif
 #endif
 
 #ifdef FEAT_PRIVDROP
@@ -64,6 +67,7 @@
 #include "local.h"
 #include "logging.h"
 #include "privops.h"
+#include "socket.h"
 #include "util.h"
 
 /* Frequency scale to convert from ppm to the timex freq */
@@ -902,33 +906,100 @@ get_precise_phc_readings(int phc_fd, int max_samples, struct timespec ts[][3])
 
 /* ================================================== */
 
-int
-SYS_Linux_OpenPHC(const char *path, int phc_index)
+/* Make sure an FD is a PHC.  Return the FD if it is, or close the FD
+   and return -1 if it is not. */
+
+static int
+verify_fd_is_phc(int phc_fd)
 {
   struct ptp_clock_caps caps;
-  char phc_path[64];
-  int phc_fd;
 
-  if (!path) {
-    if (snprintf(phc_path, sizeof (phc_path), "/dev/ptp%d", phc_index) >= sizeof (phc_path))
-      return -1;
-    path = phc_path;
-  }
-
-  phc_fd = open(path, O_RDONLY);
-  if (phc_fd < 0) {
-    LOG(LOGS_ERR, "Could not open %s : %s", path, strerror(errno));
-    return -1;
-  }
-
-  /* Make sure it is a PHC */
   if (ioctl(phc_fd, PTP_CLOCK_GETCAPS, &caps)) {
     LOG(LOGS_ERR, "ioctl(%s) failed : %s", "PTP_CLOCK_GETCAPS", strerror(errno));
     close(phc_fd);
     return -1;
   }
 
-  UTI_FdSetCloexec(phc_fd);
+  return phc_fd;
+}
+
+/* ================================================== */
+
+static int
+open_phc_by_iface_name(const char *iface)
+{
+#ifdef HAVE_LINUX_TIMESTAMPING
+  struct ethtool_ts_info ts_info;
+  char phc_device[PATH_MAX];
+  struct ifreq req;
+  int sock_fd;
+
+  sock_fd = SCK_OpenUdpSocket(NULL, NULL, NULL, 0);
+  if (sock_fd < 0)
+    return -1;
+
+  memset(&req, 0, sizeof (req));
+  memset(&ts_info, 0, sizeof (ts_info));
+
+  if (snprintf(req.ifr_name, sizeof (req.ifr_name), "%s", iface) >=
+      sizeof (req.ifr_name)) {
+    SCK_CloseSocket(sock_fd);
+    return -1;
+  }
+
+  ts_info.cmd = ETHTOOL_GET_TS_INFO;
+  req.ifr_data = (char *)&ts_info;
+
+  if (ioctl(sock_fd, SIOCETHTOOL, &req)) {
+    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
+    SCK_CloseSocket(sock_fd);
+    return -1;
+  }
+
+  /* Simplify failure paths by closing the socket as early as possible */
+  SCK_CloseSocket(sock_fd);
+  sock_fd = -1;
+
+  if (ts_info.phc_index < 0) {
+    DEBUG_LOG("PHC missing on %s", req.ifr_name);
+    return -1;
+  }
+
+  if (snprintf(phc_device, sizeof (phc_device),
+               "/dev/ptp%d", ts_info.phc_index) >= sizeof (phc_device))
+    return -1;
+
+  return open(phc_device, O_RDONLY);
+#else
+  return -1;
+#endif
+}
+
+/* ================================================== */
+
+int
+SYS_Linux_OpenPHC(const char *device)
+{
+  int phc_fd = -1;
+
+  if (device[0] == '/') {
+    phc_fd = open(device, O_RDONLY);
+    if (phc_fd >= 0)
+      phc_fd = verify_fd_is_phc(phc_fd);
+  }
+
+  if (phc_fd < 0) {
+    phc_fd = open_phc_by_iface_name(device);
+    if (phc_fd < 0) {
+      LOG(LOGS_ERR, "Could not open PHC of iface %s : %s",
+          device, strerror(errno));
+      return -1;
+    }
+    phc_fd = verify_fd_is_phc(phc_fd);
+  }
+
+  if (phc_fd >= 0)
+    UTI_FdSetCloexec(phc_fd);
 
   return phc_fd;
 }
@@ -990,6 +1061,14 @@ SYS_Linux_SetPHCExtTimestamping(int fd, int pin, int channel,
     return 0;
   }
 
+#if defined(PTP_MASK_CLEAR_ALL) && defined(PTP_MASK_EN_SINGLE)
+  /* Disable events from other channels on this descriptor */
+  if (ioctl(fd, PTP_MASK_CLEAR_ALL))
+    DEBUG_LOG("ioctl(%s) failed : %s", "PTP_MASK_CLEAR_ALL", strerror(errno));
+  else if (ioctl(fd, PTP_MASK_EN_SINGLE, &channel))
+    DEBUG_LOG("ioctl(%s) failed : %s", "PTP_MASK_EN_SINGLE", strerror(errno));
+#endif
+
   return 1;
 }
 

sys_linux.h

@@ -39,7 +39,7 @@ extern void SYS_Linux_EnableSystemCallFilter(int level, SYS_ProcessContext conte
 
 extern int SYS_Linux_CheckKernelVersion(int req_major, int req_minor);
 
-extern int SYS_Linux_OpenPHC(const char *path, int phc_index);
+extern int SYS_Linux_OpenPHC(const char *device);
 
 extern int SYS_Linux_GetPHCReadings(int fd, int nocrossts, int *reading_mode, int max_readings,
                                     struct timespec tss[][3]);

sys_timex.c

@@ -257,6 +257,8 @@ SYS_Timex_Finalise(void)
 int
 SYS_Timex_Adjust(struct timex *txc, int ignore_error)
 {
+  static long last_constant, last_freq;
+  static int last_status = -1;
   int state;
 
 #ifdef SOLARIS
@@ -270,7 +272,24 @@ SYS_Timex_Adjust(struct timex *txc, int ignore_error)
   if (state < 0) {
     LOG(ignore_error ? LOGS_DEBUG : LOGS_FATAL,
         NTP_ADJTIME_NAME"(0x%x) failed : %s", txc->modes, strerror(errno));
+    return state;
   }
 
+  /* This a good place to verify that nothing else is touching the clock,
+     without making an additional timex call.  A clock update is normally
+     expected to have four driver calls:
+     - set_sync_status - primarily updating leap status
+     - set_frequency - correcting frequency error
+     - set_frequency - correcting phase error
+     - set_sync_status - updating leap and estimated/maximum error */
+  if (last_status != -1 &&
+      (((last_status ^ txc->status) & STA_PLL && !(txc->modes & MOD_STATUS)) ||
+       (last_constant != txc->constant && !(txc->modes & MOD_TIMECONST)) ||
+       (last_freq != txc->freq && !(txc->modes & MOD_FREQUENCY))))
+    LOG(LOGS_WARN, "System clock interference detected (another NTP client?)");
+  last_status = txc->status;
+  last_constant = txc->constant;
+  last_freq = txc->freq;
+
   return state;
 }

tempcomp.c

@@ -66,10 +66,9 @@ get_tempcomp(double temp)
     return k0 + (temp - T0) * k1 + (temp - T0) * (temp - T0) * k2;
 
   /* Otherwise interpolate/extrapolate between two nearest points */
-
-  for (i = 1; i < ARR_GetSize(points); i++) {
-    p2 = (struct Point *)ARR_GetElement(points, i);
-    if (p2->temp >= temp)
+  for (i = 1; ; i++) {
+    p2 = ARR_GetElement(points, i);
+    if (p2->temp >= temp || i + 1 >= ARR_GetSize(points))
       break;
   }
   p1 = p2 - 1;

test/compilation/001-features

@@ -10,7 +10,6 @@ for opts in \
 	"--enable-debug" \
 	"--enable-ntp-signd" \
 	"--enable-scfilter" \
-	"--disable-asyncdns" \
 	"--disable-ipv6" \
 	"--disable-privdrop" \
 	"--disable-readline" \
@@ -18,19 +17,13 @@ for opts in \
 	"--disable-sechash" \
 	"--disable-cmdmon" \
 	"--disable-cmdmon --enable-scfilter" \
-	"--disable-ntp" \
-	"--disable-ntp --enable-scfilter" \
 	"--disable-nts" \
 	"--disable-refclock" \
 	"--disable-timestamping" \
-	"--disable-timestamping --disable-ntp" \
-	"--disable-cmdmon --disable-ntp" \
-	"--disable-cmdmon --disable-ntp --enable-scfilter" \
-	"--disable-cmdmon --disable-refclock" \
-	"--disable-cmdmon --disable-ntp --disable-refclock"
+	"--disable-cmdmon --disable-refclock"
 do
 	./configure $opts || exit 1
 	make clean
 	make "$@" || exit 1
-	make -C test/unit check || exit 1
+	make -C test/unit "$@" check || exit 1
 done

test/compilation/002-scanbuild

@@ -3,6 +3,7 @@
 cd ../..
 
 for opts in \
+	"--enable-debug" \
 	"--host-system=Linux" \
 	"--host-system=NetBSD" \
 	"--host-system=FreeBSD" \

test/compilation/003-sanitizers

@@ -2,7 +2,7 @@
 # Run the unit and simulation tests with different compiler sanitizers
 # and under valgrind
 
-valgrind_opts="--leak-check=full --errors-for-leak-kinds=definite"
+valgrind_opts="--leak-check=full --errors-for-leak-kinds=definite --track-fds=yes"
 
 cd ../..
 

test/simulation/008-ntpera

@@ -41,7 +41,6 @@ for time_offset in -1e-1 1e-1; do
 		export CLKNETSIM_START_DATE=$(awk "BEGIN {printf \"%.0f\", $ntp_start + $start_offset}")
 		run_test || test_fail
 		check_chronyd_exit || test_fail
-		check_source_selection || test_fail
 		check_packet_interval || test_fail
 		check_sync && test_fail
 	done

test/simulation/009-sourceselection

@@ -24,6 +24,12 @@ for falsetickers in 3 4; do
 	# These check are expected to fail
 	check_source_selection && test_fail
 	check_sync && test_fail
+
+	if [ $falsetickers = 3 ]; then
+		check_log_messages "Can't synchronise: no majority (only 2 of 5 sources agree)" 1 1 || test_fail
+	else
+		check_log_messages "Can't synchronise: no majority (no agreement among 5 sources)" 1 1 || test_fail
+	fi
 done
 
 # Sources with large asymmetric delay should be excluded

test/simulation/014-intermittent

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "intermittent connection"
+
+# Pass packets only for 1200 seconds every 10000 seconds
+base_delay=$(cat <<-EOF | tr -d '\n'
+  (+ 1e-4
+     (* -1
+        (equal 0.1 (min (% time 10000) 1200) 1200)))
+EOF
+)
+
+time_max_limit=1e-1
+freq_max_limit=1e-2
+time_rms_limit=2e-3
+freq_rms_limit=2e-5
+limit=100000
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_sync || test_fail
+
+check_log_messages "Can't.*no selectable sources (1 unreachable" 9 10 || test_fail
+check_log_messages "Selected source 192.168.123.1" 9 10 || test_fail
+
+# Pass every 20th request
+base_delay=$(cat <<-EOF | tr -d '\n'
+  (+ 1e-4
+     (* -1
+        (equal 0.1 from 2)
+        (equal 0.1 (min (% (sum 1) 20) 1) 1)))
+EOF
+)
+
+time_max_limit=1e-2
+freq_max_limit=1e-4
+time_rms_limit=5e-3
+max_sync_time=22000
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_sync || test_fail
+
+check_log_messages "Can't.*no selectable sources (1 unreachable" 5 15 || test_fail
+check_log_messages "Selected source 192.168.123.1" 5 15 || test_fail
+
+test_pass

test/simulation/015-ipv6

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "IPv6 addressing"
+
+ip_family=6
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+test_pass

test/simulation/106-refclock

@@ -35,11 +35,7 @@ Root delay      : 0.001000000 seconds
 Update interval : 16\.. seconds
 .*$" || test_fail
 
-	if echo "$refclock" | grep -q 'PHC.*nocrossts'; then
-		check_file_messages "20.* GPS.*[0-9] N " 650 750 refclocks.log || test_fail
-	else
-		check_file_messages "20.* GPS.*[0-9] N " 997 1001 refclocks.log || test_fail
-	fi
+	check_file_messages "20.* GPS.*[0-9] N " 997 1001 refclocks.log || test_fail
 	check_file_messages "20.* GPS.*- N " 61 63 refclocks.log || test_fail
 	rm -f tmp/refclocks.log
 done
@@ -64,7 +60,7 @@ Stratum.*: 1
 Root delay      : 0\.000000001 seconds
 .*$" || test_fail
 
-	check_file_messages "20.* PPS1.*[0-9] N " 620 740 refclocks.log || test_fail
+	check_file_messages "20.* PPS1.*[0-9] N " 610 740 refclocks.log || test_fail
 	check_file_messages "20.* PPS1.*- N " 60 63 refclocks.log || test_fail
 	rm -f tmp/refclocks.log
 
@@ -89,14 +85,15 @@ Root delay      : 0\.000000001 seconds
 	check_file_messages "20.* PPS1.*- N " 60 63 refclocks.log || test_fail
 	rm -f tmp/refclocks.log
 
-	min_sync_time=100
-	max_sync_time=220
-	chronyc_start=220
+	min_sync_time=180
+	max_sync_time=260
+	chronyc_start=270
 	client_conf="
 refclock SHM 0 refid NMEA offset 0.35 delay 0.1
 refclock PPS /dev/pps0
 logdir tmp
-log refclocks"
+log refclocks
+maxupdateskew 10000"
 
 	run_test || test_fail
 	check_chronyd_exit || test_fail
@@ -108,11 +105,63 @@ Stratum.*: 1
 Root delay      : 0\.000000001 seconds
 .*$" || test_fail
 
-	check_file_messages "20.* PPS1.*[0-9] N " 800 940  refclocks.log || test_fail
+	check_file_messages "20.* PPS1.*[0-9] N " 800 960  refclocks.log || test_fail
 	check_file_messages "20.* PPS1.*- N " 50 63 refclocks.log || test_fail
 	rm -f tmp/refclocks.log
+
+	min_sync_time=80
+	max_sync_time=180
+	chronyc_start=220
+	# Swapped order of SHM and PPS impacts first accepted sample
+	client_conf="
+refclock PPS /dev/pps0
+refclock SHM 0 refid NMEA offset 0.35 delay 0.1
+logdir tmp
+log refclocks
+maxupdateskew 10000"
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+	check_chronyc_output "^Reference ID.*50505330 \(PPS0\)
+Stratum.*: 1
+.*
+Root delay      : 0\.000000001 seconds
+.*$" || test_fail
+
+	check_file_messages "20.* PPS0.*[0-9] N " 800 960  refclocks.log || test_fail
+	check_file_messages "20.* PPS0.*- N " 50 63 refclocks.log || test_fail
+	rm -f tmp/refclocks.log
 fi
 
+export CLKNETSIM_PHC_JITTER_OFF=$[2 * 25 * 492]
+export CLKNETSIM_PHC_JITTER_ON=$[2 * 25 * 8]
+export CLKNETSIM_PHC_JITTER=1e-6
+refclock_offset=0.0
+refclock_jitter=1e-9
+min_sync_time=5
+max_sync_time=7
+time_max_limit=1e-7
+time_rms_limit=1e-8
+client_conf="refclock PHC /dev/ptp0:nocrossts poll 0
+logdir tmp
+log refclocks"
+chronyc_start=500
+chronyc_conf="sources"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+check_chronyc_output "^MS.*
+=*
+#\* PHC0                          0   0   377     8 .*$" || test_fail
+rm -f tmp/refclocks.log
+
+unset CLKNETSIM_PHC_JITTER_OFF
+unset CLKNETSIM_PHC_JITTER_ON
+export CLKNETSIM_PHC_JITTER=1e-7
 refclock_offset="(+ 0.399 (sum 1e-3))"
 refclock_jitter=1e-6
 servers=1

test/simulation/108-peer

@@ -21,6 +21,7 @@ EOF
 
 clients=2
 peers=2
+freq_max_limit=1e-3
 max_sync_time=1000
 client_server_options="minpoll 6 maxpoll 6"
 client_peer_options="minpoll 6 maxpoll 6"
@@ -30,6 +31,18 @@ check_chronyd_exit || test_fail
 check_source_selection || test_fail
 check_sync || test_fail
 
+if check_config_h 'FEAT_IPV6 1'; then
+	ip_family=6
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+
+	ip_family=$default_ip_family
+fi
+
+freq_max_limit=$default_freq_max_limit
 base_delay="(+ 1e-4 (* -1 (equal 0.1 from 3) (equal 0.1 to 1)))"
 client_peer_options=""
 

test/simulation/110-chronyc

@@ -58,7 +58,7 @@ MS Name/IP address         Stratum Poll Reach LastRx Last sample
 \^\? 192\.168\.123\.2                 0   [0-9]+     0     -     \+0ns\[   \+0ns\] \+/-    0ns
 Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
 ==============================================================================
-SHM0                       [0-9 ]+ [0-9 ]+ [0-9 ]+ [ +-][01]\.... [0-9 ]+\....  [0-9 +-]+[un]s [0-9 ]+[un]s
+SHM0                       [0-9 ]+ [0-9 ]+ [0-9 ]+ [ +-][012]\.... [0-9 ]+\....  [0-9 +-]+[un]s [0-9 ]+[un]s
 192\.168\.123\.1              [0-9 ]+ [0-9 ]+ [0-9 ]+ [ +-][01]\.... [0-9 ]+\....  [0-9 +-]+[un]s [0-9 ]+[un]s
 192\.168\.123\.2               0   0     0     \+0\.000   2000\.000     \+0ns  4000ms
 210 n_samples = 0
@@ -114,7 +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 extfield F324" \
+	"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 ipv6 ipv4" \
 	"add server node1.net1.clk" \
 	"allow 1.2.3.4" \
 	"allow 1.2" \
@@ -145,7 +145,7 @@ for chronyc_conf in \
 	"dfreq 1.0e-3" \
 	"doffset -1.0" \
 	"dump" \
-	"local stratum 5 distance 1.0 orphan" \
+	"local stratum 5 distance 1.0 activate 0.5 orphan waitsynced 100 waitunsynced 20" \
 	"local off" \
 	"makestep 10.0 3" \
 	"makestep" \
@@ -165,6 +165,7 @@ for chronyc_conf in \
 	"offline" \
 	"offline 255.255.255.0/1.2.3.0" \
 	"offline 1.2.3.0/24" \
+	"offset 1.2.3.4 1.0" \
 	"online" \
 	"online 1.2.3.0/24" \
 	"onoffline" \
@@ -194,6 +195,33 @@ do
 	check_chronyc_output "501 Not authorised$" || test_fail
 done
 
+for chronyc_conf in \
+	"activity" \
+	"authdata" \
+	"clients" \
+	"manual list" \
+	"ntpdata" \
+	"rtcdata" \
+	"selectdata" \
+	"serverstats" \
+	"smoothing" \
+	"sourcename 192.168.123.1" \
+	"sources" \
+	"sourcestats" \
+	"tracking"
+do
+	server_conf="opencommands ${chronyc_conf% *}"
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_chronyc_output "501 Not authorised$" && test_fail
+
+	server_conf="opencommands"
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_chronyc_output "501 Not authorised$" || test_fail
+done
+
+server_conf="server 192.168.123.1"
 cmdmon_unix=1
 
 chronyc_conf="
@@ -241,12 +269,16 @@ Jitter asymmetry: \+0\.00
 NTP tests       : 111 111 1110
 Interleaved     : No
 Authenticated   : No
-TX timestamping : Kernel
-RX timestamping : Kernel
+TX timestamping : (Daemon|Kernel)
+RX timestamping : (Daemon|Kernel)
 Total TX        : 1
 Total RX        : 1
 Total valid RX  : 1
 Total good RX   : 0
+Total kernel TX : [01]
+Total kernel RX : [01]
+Total HW TX     : 0
+Total HW RX     : 0
 S Name/IP Address        Auth COpts EOpts Last Score     Interval  Leap
 =======================================================================
 M node1\.net1\.clk            N ----- -----    0   1\.0    \+0ns    \+0ns  N
@@ -261,9 +293,9 @@ Authenticated NTP packets  : 0
 Interleaved NTP packets    : 0
 NTP timestamps held        : 0
 NTP timestamp span         : 0
-NTP daemon RX timestamps   : 0
+NTP daemon RX timestamps   : [01]
 NTP daemon TX timestamps   : 1
-NTP kernel RX timestamps   : 1
+NTP kernel RX timestamps   : [01]
 NTP kernel TX timestamps   : 0
 NTP hardware RX timestamps : 0
 NTP hardware TX timestamps : 0$" || test_fail
@@ -347,6 +379,7 @@ maxpoll 192.168.123.1 5
 maxupdateskew 192.168.123.1 10.0
 minpoll 192.168.123.1 3
 minstratum 192.168.123.1 1
+offset 192.168.123.1 -1.0
 polltarget 192.168.123.1 10
 selectopts 192.168.123.1 +trust +prefer -require
 selectdata
@@ -371,6 +404,7 @@ 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  \?
@@ -385,7 +419,7 @@ cyclelogs
 dump
 dfreq 1.0e-3
 doffset -0.01
-local stratum 5 distance 1.0 orphan
+local stratum 5 distance 1.0 orphan waitsynced 100 waitunsynced 10
 local off
 makestep 10.0 3
 makestep
@@ -433,7 +467,12 @@ server_conf="
 server 192.168.123.1
 noclientlog"
 
-commands=(
+check_config_h 'FEAT_IPV6 1' && commands=(
+	"add server ::1 ipv4" "^515 Invalid address family$"
+	) || commands=()
+
+commands+=(
+	"add server 192.168.123.1 ipv6" "^515 Invalid address family$"
 	"add server nosuchnode.net1.clk" "^Invalid host/IP address$"
 	"allow nosuchnode.net1.clk" "^Could not read address$"
 	"allow 192.168.123.0/2 4" "^Could not read address$"

test/simulation/113-leapsecond

@@ -8,54 +8,86 @@ check_config_h 'FEAT_REFCLOCK 1' || test_skip
 
 export CLKNETSIM_START_DATE=$(TZ=UTC date -d 'Dec 30 2008 0:00:00' +'%s')
 
-leap=$[2 * 24 * 3600]
 limit=$[4 * 24 * 3600]
 client_start=$[2 * 3600]
-server_conf="refclock SHM 0 dpoll 10 poll 10
-leapsectz right/UTC"
 refclock_jitter=1e-9
-refclock_offset="(* -1.0 (equal 0.1 (max (sum 1.0) $leap) $leap))"
 
-for leapmode in system step slew; do
-	client_conf="leapsecmode $leapmode"
-	if [ $leapmode = slew ]; then
-		max_sync_time=$[$leap + 12]
-	else
-		max_sync_time=$[$leap]
-	fi
-
-	run_test || test_fail
-	check_chronyd_exit || test_fail
-	check_source_selection || test_fail
-	check_packet_interval || test_fail
-	check_sync || test_fail
-done
-
-client_server_options="trust"
-client_conf="refclock SHM 0 dpoll 10 poll 10 delay 1e-3"
-
-run_test || test_fail
-check_chronyd_exit || test_fail
-check_source_selection || test_fail
-check_packet_interval || test_fail
-check_sync || test_fail
-
-client_server_options=""
-client_conf="leapsecmode system"
-min_sync_time=230000
-max_sync_time=240000
-
-for smoothmode in "" "leaponly"; do
+for dir in "+1" "-1"; do
+	leap=$[2 * 24 * 3600 + 1 + $dir]
 	server_conf="refclock SHM 0 dpoll 10 poll 10
-	leapsectz right/UTC
-	leapsecmode slew
-	smoothtime 400 0.001 $smoothmode"
+	leapseclist tmp/leap.list"
+	refclock_offset="(* $dir (equal 0.1 (max (sum 1.0) $leap) $leap))"
+
+	cat > tmp/leap.list <<-EOF
+		#$	3676924800
+		#@	3928521600
+		3345062400	33	# 1 Jan 2006
+		3439756800	$[33 - $dir]	# 1 Jan 2009 $(
+		[ "$dir" = "+1" ] && echo -e "\n3471292800	33\n3502828800	34")
+		3550089600	35	# 1 Jul 2012
+	EOF
+
+	for leapmode in system step slew; do
+		client_conf="leapsecmode $leapmode"
+		if [ $leapmode = slew ]; then
+			max_sync_time=$[2 * 24 * 3600 + 13]
+		else
+			max_sync_time=$[2 * 24 * 3600 + 1]
+		fi
+		min_sync_time=$[$max_sync_time - 2]
+
+		run_test || test_fail
+		check_chronyd_exit || test_fail
+		check_source_selection || test_fail
+		check_packet_interval || test_fail
+		check_sync || test_fail
+		check_file_messages "System clock TAI offset set to" 1 1 log.1 || test_fail
+		check_file_messages "System clock TAI offset set to 33" 1 1 log.1 || test_fail
+	done
+
+	client_server_options="trust"
+	client_conf="refclock SHM 0 dpoll 10 poll 10 delay 1e-3"
+	min_sync_time=$[$leap - 2]
+	max_sync_time=$[$leap]
 
 	run_test || test_fail
 	check_chronyd_exit || test_fail
 	check_source_selection || test_fail
 	check_packet_interval || test_fail
 	check_sync || test_fail
+
+	client_server_options=""
+	client_conf="leapsecmode system"
+	min_sync_time=230000
+	max_sync_time=240000
+
+	for smoothmode in "" "leaponly"; do
+		server_conf="refclock SHM 0 dpoll 10 poll 10
+		leapseclist tmp/leap.list
+		leapsecmode slew
+		smoothtime 400 0.001 $smoothmode"
+
+		run_test || test_fail
+		check_chronyd_exit || test_fail
+		check_source_selection || test_fail
+		check_packet_interval || test_fail
+		check_sync || test_fail
+	done
 done
 
+if TZ=right/UTC date -d 'Dec 31 2008 23:59:60' 2> /dev/null | grep :60; then
+	server_conf="refclock SHM 0 dpoll 10 poll 10
+	leapsectz right/UTC"
+	refclock_offset="(* -1 (equal 0.1 (max (sum 1.0) $leap) $leap))"
+	client_conf="leapsecmode system"
+	min_sync_time=$[$leap - 2]
+	max_sync_time=$[$leap]
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_packet_interval || test_fail
+	check_sync || test_fail
+fi
+
 test_pass

test/simulation/118-maxdelay

@@ -14,7 +14,6 @@ client_server_options="maxpoll 6 maxdelay 3e-5 maxdelayratio 2.0 maxdelaydevrati
 
 run_test || test_fail
 check_chronyd_exit || test_fail
-check_source_selection || test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
 

test/simulation/119-smoothtime

@@ -14,7 +14,7 @@ max_sync_time=800
 
 run_test || test_fail
 check_chronyd_exit || test_fail
-check_source_selection || test_fail
+check_source_selection && test_fail
 check_sync || test_fail
 
 limit=10000

test/simulation/121-local

@@ -0,0 +1,141 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "local options"
+
+check_config_h 'FEAT_CMDMON 1' || test_skip
+
+server_strata=3
+server_conf="local stratum 5 orphan waitunsynced 0
+server 192.168.123.1
+server 192.168.123.2
+server 192.168.123.3"
+max_sync_time=900
+client_start=140
+chronyc_start=700
+chronyc_conf="tracking"
+time_rms_limit=5e-4
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+check_chronyc_output "^.*Stratum *: 7.*$" || test_fail
+
+limit=1000
+server_conf="local stratum 5 orphan
+server 192.168.123.1 minpoll 6 maxpoll 6
+server 192.168.123.2 minpoll 6 maxpoll 6
+server 192.168.123.3 minpoll 6 maxpoll 6"
+server_server_options="minpoll 6 maxpoll 6"
+client_start=0
+client_server_conf="
+server 192.168.123.1 minpoll 6 maxpoll 6
+server 192.168.123.2 minpoll 6 maxpoll 6
+server 192.168.123.3 minpoll 6 maxpoll 6"
+client_conf="logdir tmp
+log measurements"
+chronyc_start=700
+chronyc_conf=""
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_sync || test_fail
+check_file_messages "20.*123\.1.* 5 111 " 10 11 measurements.log || test_fail
+check_file_messages "20.*123\.1.* [6-9] 111 " 0 0 measurements.log || test_fail
+check_file_messages "20.*123\.2.* 5 111 " 2 4 measurements.log || test_fail
+check_file_messages "20.*123\.2.* 6 111 " 7 9 measurements.log || test_fail
+check_file_messages "20.*123\.2.* [7-9] 111 " 0 0 measurements.log || test_fail
+check_file_messages "20.*123\.3.* 5 111 " 2 4 measurements.log || test_fail
+check_file_messages "20.*123\.3.* 6 111 " 7 9 measurements.log || test_fail
+check_file_messages "20.*123\.3.* [7-9] 111 " 0 0 measurements.log || test_fail
+rm -f tmp/measurements.log
+
+server_conf="local stratum 5 orphan distance 0.0 waitsynced 150 waitunsynced 0"
+base_delay=$(cat <<-EOF | tr -d '\n'
+  (+ 1e-4
+     (* -1
+        (equal 0.1 from 1)
+        (equal 0.1 to 2)
+        (equal 0.1 (min time 500) 500)))
+EOF
+)
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_sync || test_fail
+check_file_messages "20.*:1.:.*123\.1.* 5 111 " 6 6 measurements.log || test_fail
+check_file_messages "20.*:0.:.*123\.2.* 5 111 " 2 3 measurements.log || test_fail
+check_file_messages "20.*:1.:.*123\.2.* 5 111 " 6 7 measurements.log || test_fail
+check_file_messages "20.*:0.:.*123\.3.* 5 111 " 7 10 measurements.log || test_fail
+check_file_messages "20.*:1.:.*123\.3.* 5 111 " 0 1 measurements.log || test_fail
+rm -f tmp/measurements.log
+
+limit=4000
+wander=0.0
+jitter=0.0
+server_strata=1
+server_conf=""
+server_server_options=""
+client_server_conf=""
+client_server_options="minpoll 6 maxpoll 6 minsamples 64"
+chronyc_start=1
+chronyc_conf="timeout 1000000
+tracking
+tracking
+tracking
+tracking"
+base_delay=$(cat <<-EOF | tr -d '\n'
+  (+ 1e-4
+     (* 990
+        (equal 0.1 from 3))
+     (* -1
+        (equal 0.1 from 1)
+        (equal 0.1 (max (% time 2000) 1000) 1000)))
+EOF
+)
+
+client_conf="local
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.*7F7F0101.*C0A87B01.*7F7F0101.*C0A87B01.*$" || test_fail
+
+client_conf="local distance 0.5
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.*7F7F0101.*C0A87B01.*7F7F0101.*C0A87B01.*$" || test_fail
+
+client_conf="local distance 2.0
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.*7F7F0101.*C0A87B01.*C0A87B01.*C0A87B01.*$" || test_fail
+
+client_conf="local activate 1e-4
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.* 00000000 .*C0A87B01.*C0A87B01.*C0A87B01.*$" || test_fail
+
+client_conf="local activate 1e-1
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.* 00000000 .*C0A87B01.*7F7F0101.*C0A87B01.*$" || test_fail
+
+client_conf="local activate 1e-1 distance 2.0
+maxclockerror 1000"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_chronyc_output "^.* 00000000 .*C0A87B01.*C0A87B01.*C0A87B01.*$" || test_fail
+
+test_pass

test/simulation/121-orphan

@@ -1,26 +0,0 @@
-#!/usr/bin/env bash
-
-. ./test.common
-
-test_start "orphan option"
-
-check_config_h 'FEAT_CMDMON 1' || test_skip
-
-server_strata=3
-server_conf="local stratum 5 orphan
-server 192.168.123.1
-server 192.168.123.2
-server 192.168.123.3"
-max_sync_time=900
-client_start=140
-chronyc_start=700
-chronyc_conf="tracking"
-time_rms_limit=5e-4
-
-run_test || test_fail
-check_chronyd_exit || test_fail
-check_source_selection || test_fail
-check_sync || test_fail
-check_chronyc_output "^.*Stratum *: 7.*$" || test_fail
-
-test_pass

test/simulation/122-xleave

@@ -53,7 +53,6 @@ for rpoll in 4 5 6; do
 
 	run_test || test_fail
 	check_chronyd_exit || test_fail
-	check_source_selection || test_fail
 	check_sync || test_fail
 
 	if [ $rpoll -le 5 ]; then

test/simulation/124-tai

@@ -18,9 +18,17 @@ servers=0
 refclock_offset="(+ -34 (equal 0.1 (max (sum 1.0) $leap) $leap))"
 client_conf="
 refclock SHM 0 dpoll 0 poll 0 tai
-leapsectz right/UTC
+leapseclist tmp/leap.list
 leapsecmode ignore
-maxchange 1e-3 1 0"
+maxchange 1e-3 10 0"
+
+cat > tmp/leap.list <<-EOF
+	#$	3676924800
+	#@	3928521600
+	3345062400	33	# 1 Jan 2006
+	3439756800	34	# 1 Jan 2009
+	3550089600	35	# 1 Jul 2012
+EOF
 
 run_test || test_fail
 check_chronyd_exit || test_fail
@@ -33,9 +41,9 @@ time_offset=-1000
 refclock_offset="(+ -34)"
 client_conf="
 refclock SHM 0 dpoll 0 poll 0 tai
-leapsectz right/UTC
+leapseclist tmp/leap.list
 makestep 1 1
-maxchange 1e-3 1 0"
+maxchange 1e-3 10 0"
 
 run_test || test_fail
 check_chronyd_exit || test_fail

test/simulation/126-burst

@@ -22,7 +22,7 @@ client_min_mean_out_interval=150.0
 
 run_test || test_fail
 check_chronyd_exit || test_fail
-check_source_selection || test_fail
+check_source_selection && test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
 

test/simulation/127-filter

@@ -12,7 +12,7 @@ client_min_mean_out_interval=15.9
 
 run_test || test_fail
 check_chronyd_exit || test_fail
-check_source_selection || test_fail
+check_source_selection && test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
 

test/simulation/128-nocontrol

@@ -22,6 +22,24 @@ check_chronyd_exit || test_fail
 check_source_selection || test_fail
 check_packet_interval || test_fail
 check_sync || test_fail
-check_chronyc_output "^.*Stratum *: 2.*$" || test_fail
+check_chronyc_output "^.*Stratum *: 2
+Ref time.*
+System time *: 0.000.*
+Last offset *: [+-]0.000.*$" || test_fail
+check_log_messages "Could not step" 0 0 || test_fail
+
+client_conf="makestep 0.01 -1"
+client_server_options="offset 5.0005"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+check_chronyc_output "^.*Stratum *: 2
+Ref time.*
+System time *: 5.000.*
+Last offset *: [+-]0.000.*$" || test_fail
+check_log_messages "Could not step" 20 60 || test_fail
 
 test_pass

test/simulation/133-hwtimestamp

@@ -58,6 +58,21 @@ for client_conf in \
 	fi
 done
 
+if check_config_h 'FEAT_IPV6 1'; then
+	server_chronyd_options="-6"
+	client_chronyd_options="-6"
+	ip_family=6
+
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_sync || test_fail
+
+	server_chronyd_options=$default_server_chronyd_options
+	client_chronyd_options="-d"
+	ip_family=$default_ip_family
+fi
+
 server_conf+="
 server 192.168.123.2 minpoll 1 maxpoll 1 noselect"
 

test/simulation/135-ratelimit

@@ -15,4 +15,15 @@ check_sync || test_fail
 check_file_messages "	2	1	" 1200 1300 log.packets || test_fail
 check_file_messages "	1	2	" 180 220 log.packets || test_fail
 
+server_conf="ratelimit interval 6 burst 2 leak 4 kod 2"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_packet_interval || test_fail
+check_sync || test_fail
+
+check_file_messages "	2	1	" 700 850 log.packets || test_fail
+check_file_messages "	1	2	" 350 450 log.packets || test_fail
+check_log_messages "Received KoD RATE.*\.123.1" 100 140 || test_fail
+
 test_pass