doc: update NEWS

GNU readline switched to GPLv3+ in version 6.0, which is incompatible
with the chrony's GPLv2 license.

Drop support for the readline library. Only editline is supported now.

Makefile.in

@@ -134,4 +134,6 @@ Makefile : Makefile.in configure
 .deps/%.d: %.c | .deps
 	@$(CC) -MM $(CPPFLAGS) -MT '$(<:%.c=%.o) $@' $< -o $@
 
+ifndef NODEPS
 -include $(ALL_OBJS:%.o=.deps/%.d)
+endif

NEWS

@@ -5,26 +5,51 @@ Enhancements
 ------------
 * Add support for Network Time Security (NTS) authentication
 * Add support for AES-CMAC keys (AES128, AES256) with Nettle
-* Add support for maxsamples of 1 for faster update with -q/-Q option
+* Add authselectmode directive to control selection of unauthenticated sources
+* Add binddevice, bindacqdevice, bindcmddevice directives
+* Add confdir directive to better support fragmented configuration
+* Add sourcedir directive and "reload sources" command to support dynamic
+  NTP sources specified in files
+* Add clockprecision directive
+* Add dscp directive to set Differentiated Services Code Point (DSCP)
 * Add -L option to limit log messages by severity
+* Add -p option to print whole configuration with included files
+* Add -U option to allow start under non-root user
+* Allow maxsamples to be set to 1 for faster update with -q/-Q option
 * Avoid replacing NTP sources with sources that have unreachable address
 * Improve pools to repeat name resolution to get "maxsources" sources
+* Improve source selection with trusted sources
 * Improve NTP loop test to prevent synchronisation to itself
+* Repeat iburst when NTP source is switched from offline state to online
 * Update clock synchronisation status and leap status more frequently
 * Update seccomp filter
 * Add "add pool" command
+* Add "reset sources" command to drop all measurements
+* Add authdata command to print details about NTP authentication
+* Add selectdata command to print details about source selection
 * Add -N option and sourcename command to print original names of sources
-* Add -a option to sources/sourcestats command to print unresolved sources
+* Add -a option to some commands to print also unresolved sources
-* Add reset command to drop all measurements
+* Add -k, -p, -r options to clients command to select, limit, reset data
 
 Bug fixes
 ---------
+* Don't set interface for NTP responses to allow asymmetric routing
 * Handle RTCs that don't support interrupts
 * Respond to command requests with correct address on multihomed hosts
 
 Removed features
 ----------------
 * Drop support for RIPEMD keys (RMD128, RMD160, RMD256, RMD320)
+* Drop support for long (non-standard) MACs in NTPv4 packets (chrony 2.x
+  clients using non-MD5/SHA1 keys need to use option "version 3")
+* Drop support for line editing with GNU Readline
+
+New in version 3.5.1
+====================
+
+Security fixes
+--------------
+* Create new file when writing pidfile (CVE-2020-14367)
 
 New in version 3.5
 ==================

README

@@ -29,9 +29,7 @@ What will chrony run on?
 
 The software is known to work on Linux, FreeBSD, NetBSD, macOS and
 Solaris.  Closely related systems may work too.  Any other system will
-likely require a porting exercise.  You would need to start from one
+likely require a porting exercise.
-of the existing system-specific drivers and look into the quirks of
-certain system calls and the kernel on your target system.
 
 How do I set it up?
 ===================
@@ -55,24 +53,20 @@ Where are new versions announced?
 =================================
 
 There is a low volume mailing list where new versions and other
-important news relating to chrony is announced.  You can join this list
+important news relating to chrony are announced.  You can join this list
 by sending mail with the subject "subscribe" to
 
 chrony-announce-request@chrony.tuxfamily.org
 
-These messages will be copied to chrony-users (see below).
-
 How can I get support for chrony?
-and where can I discuss new features, possible bugs etc?
+=================================
-========================================================
 
-There are 3 mailing lists relating to chrony.  chrony-announce was
+There are two other mailing lists relating to chrony.  chrony-users is a
-mentioned above.  chrony-users is a users' discussion list, e.g. for
+discussion list for users, e.g. for questions about chrony configuration
-general questions and answers about using chrony.  chrony-dev is a more
+and bug reports.  chrony-dev is a more technical list for developers,
-technical list, e.g. for discussing how new features should be
+e.g. for submitting patches and discussing how new features should be
-implemented, exchange of information between developers etc.  To
+implemented.  To subscribe to either of these lists, send a message with
-subscribe to either of these lists, send a message with the subject
+the subject "subscribe" to
-"subscribe" to
 
 chrony-users-request@chrony.tuxfamily.org
 or
@@ -80,12 +74,6 @@ chrony-dev-request@chrony.tuxfamily.org
 
 as applicable.
 
-When you are reporting a bug, please send us all the information you can.
-Unfortunately, chrony has proven to be one of those programs where it is very
-difficult to reproduce bugs in a different environment. So we may have to
-interact with you quite a lot to obtain enough extra logging and tracing to
-pin-point the problem in some cases. Please be patient and plan for this!
-
 License
 =======
 
@@ -100,12 +88,13 @@ Miroslav Lichvar <mlichvar@redhat.com>
 Acknowledgements
 ================
 
-In writing the chronyd program, extensive use has been made of RFC 1305
+In writing the chronyd program, extensive use has been made of the NTPv3 (RFC
-and RFC 5905, written by David Mills. The source code of the NTP reference
+1305) and NTPv4 (RFC 5905) specification.  The source code of the xntpd/ntpd
-implementation has been used to check the details of the protocol.
+implementation written by Dennis Fergusson, Lars Mathiesen, David Mills, and
+others, has been used to check the details of the protocol.
 
 The following people have provided patches and other major contributions
-to the program :
+to chrony:
 
 Lonnie Abelbeck <lonnie@abelbeck.com>
 Benny Lyne Amorsen <benny@amorsen.dk>
@@ -121,6 +110,7 @@ Bryan Christianson <bryan@whatroute.net>
 Juliusz Chroboczek <jch@pps.jussieu.fr>
 Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Paul Elliott <pelliott@io.com>
+Robert Fairley <rfairley@redhat.com>
 Stefan R. Filipek <srfilipek@gmail.com>
 Mike Fleetwood <mike@rockover.demon.co.uk>
 Alexander Gretencord <arutha@gmx.de>

candm.h

@@ -103,8 +103,12 @@
 #define REQ_ONOFFLINE 63
 #define REQ_ADD_SOURCE 64
 #define REQ_NTP_SOURCE_NAME 65
-#define REQ_RESET 66
+#define REQ_RESET_SOURCES 66
-#define N_REQUEST_TYPES 67
+#define REQ_AUTH_DATA 67
+#define REQ_CLIENT_ACCESSES_BY_INDEX3 68
+#define REQ_SELECT_DATA 69
+#define REQ_RELOAD_SOURCES 70
+#define N_REQUEST_TYPES 71
 
 /* Structure used to exchange timespecs independent of time_t size */
 typedef struct {
@@ -267,7 +271,7 @@ typedef struct {
 
 typedef struct {
   uint32_t type;
-  int8_t name[256];
+  uint8_t name[256];
   uint32_t port;
   int32_t minpoll;
   int32_t maxpoll;
@@ -320,6 +324,8 @@ typedef struct {
 typedef struct {
   uint32_t first_index;
   uint32_t n_clients;
+  uint32_t min_hits;
+  uint32_t reset;
   int32_t EOR;
 } REQ_ClientAccessesByIndex;
 
@@ -351,6 +357,16 @@ typedef struct {
   int32_t EOR;
 } REQ_NTPSourceName;
 
+typedef struct {
+  IPAddr ip_addr;
+  int32_t EOR;
+} REQ_AuthData;
+
+typedef struct {
+  uint32_t index;
+  int32_t EOR;
+} REQ_SelectData;
+
 /* ================================================== */
 
 #define PKT_TYPE_CMD_REQUEST 1
@@ -389,7 +405,8 @@ typedef struct {
    Version 6 (no authentication) : changed format of client accesses by index
    (using new request/reply types) and manual timestamp, added new fields and
    flags to NTP source request and report, made length of manual list constant,
-   added new commands: ntpdata, refresh, serverstats, shutdown
+   added new commands: authdata, ntpdata, onoffline, refresh, reset,
+   selectdata, serverstats, shutdown, sourcename
  */
 
 #define PROTO_VERSION_NUMBER 6
@@ -403,8 +420,8 @@ typedef struct {
 #define PROTO_VERSION_PADDING 6
 
 /* The maximum length of padding in request packet, currently
-   defined by MANUAL_LIST */
+   defined by CLIENT_ACCESSES_BY_INDEX3 */
-#define MAX_PADDING_LENGTH 396
+#define MAX_PADDING_LENGTH 484
 
 /* ================================================== */
 
@@ -453,7 +470,9 @@ typedef struct {
     REQ_ReselectDistance reselect_distance;
     REQ_SmoothTime smoothtime;
     REQ_NTPData ntp_data;
-    REQ_NTPData ntp_source_name;
+    REQ_NTPSourceName ntp_source_name;
+    REQ_AuthData auth_data;
+    REQ_SelectData select_data;
   } data; /* Command specific parameters */
 
   /* Padding used to prevent traffic amplification.  It only defines the
@@ -491,7 +510,11 @@ typedef struct {
 #define RPY_MANUAL_TIMESTAMP2 17
 #define RPY_MANUAL_LIST2 18
 #define RPY_NTP_SOURCE_NAME 19
-#define N_REPLY_TYPES 20
+#define RPY_AUTH_DATA 20
+#define RPY_CLIENT_ACCESSES_BY_INDEX3 21
+#define RPY_SERVER_STATS2 22
+#define RPY_SELECT_DATA 23
+#define N_REPLY_TYPES 24
 
 /* Status codes */
 #define STT_SUCCESS 0
@@ -530,17 +553,12 @@ typedef struct {
 #define RPY_SD_MD_PEER   1
 #define RPY_SD_MD_REF    2
 
-#define RPY_SD_ST_SYNC 0
+#define RPY_SD_ST_SELECTED 0
-#define RPY_SD_ST_UNREACH 1
+#define RPY_SD_ST_NONSELECTABLE 1
 #define RPY_SD_ST_FALSETICKER 2
 #define RPY_SD_ST_JITTERY 3
-#define RPY_SD_ST_CANDIDATE 4
+#define RPY_SD_ST_UNSELECTED 4
-#define RPY_SD_ST_OUTLIER 5
+#define RPY_SD_ST_SELECTABLE 5
-
-#define RPY_SD_FLAG_NOSELECT 0x1
-#define RPY_SD_FLAG_PREFER 0x2
-#define RPY_SD_FLAG_TRUST 0x4
-#define RPY_SD_FLAG_REQUIRE 0x8
 
 typedef struct {
   IPAddr ip_addr;
@@ -609,14 +627,17 @@ typedef struct {
 typedef struct {
   IPAddr ip;
   uint32_t ntp_hits;
+  uint32_t nke_hits;
   uint32_t cmd_hits;
   uint32_t ntp_drops;
+  uint32_t nke_drops;
   uint32_t cmd_drops;
   int8_t ntp_interval;
+  int8_t nke_interval;
   int8_t cmd_interval;
   int8_t ntp_timeout_interval;
-  int8_t pad;
   uint32_t last_ntp_hit_ago;
+  uint32_t last_nke_hit_ago;
   uint32_t last_cmd_hit_ago;
 } RPY_ClientAccesses_Client;
 
@@ -630,10 +651,13 @@ typedef struct {
 
 typedef struct {
   uint32_t ntp_hits;
+  uint32_t nke_hits;
   uint32_t cmd_hits;
   uint32_t ntp_drops;
+  uint32_t nke_drops;
   uint32_t cmd_drops;
   uint32_t log_drops;
+  uint32_t ntp_auth_hits;
   int32_t EOR;
 } RPY_ServerStats;
 
@@ -708,10 +732,48 @@ typedef struct {
 } RPY_NTPData;
 
 typedef struct {
-  int8_t name[256];
+  uint8_t name[256];
   int32_t EOR;
 } RPY_NTPSourceName;
 
+#define RPY_AD_MD_NONE 0
+#define RPY_AD_MD_SYMMETRIC 1
+#define RPY_AD_MD_NTS 2
+
+typedef struct {
+  uint16_t mode;
+  uint16_t key_type;
+  uint32_t key_id;
+  uint16_t key_length;
+  uint16_t ke_attempts;
+  uint32_t last_ke_ago;
+  uint16_t cookies;
+  uint16_t cookie_length;
+  uint16_t nak;
+  uint16_t pad;
+  int32_t EOR;
+} RPY_AuthData;
+
+#define RPY_SD_OPTION_NOSELECT 0x1
+#define RPY_SD_OPTION_PREFER 0x2
+#define RPY_SD_OPTION_TRUST 0x4
+#define RPY_SD_OPTION_REQUIRE 0x8
+
+typedef struct {
+  uint32_t ref_id;
+  IPAddr ip_addr;
+  uint8_t state_char;
+  uint8_t authentication;
+  uint8_t pad[2];
+  uint16_t conf_options;
+  uint16_t eff_options;
+  uint32_t last_sample_ago;
+  Float score;
+  Float lo_limit;
+  Float hi_limit;
+  int32_t EOR;
+} RPY_SelectData;
+
 typedef struct {
   uint8_t version;
   uint8_t pkt_type;
@@ -742,6 +804,8 @@ typedef struct {
     RPY_Smoothing smoothing;
     RPY_NTPData ntp_data;
     RPY_NTPSourceName ntp_source_name;
+    RPY_AuthData auth_data;
+    RPY_SelectData select_data;
   } data; /* Reply specific parameters */
 
 } CMD_Reply;

client.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Lonnie Abelbeck  2016, 2018
- * Copyright (C) Miroslav Lichvar  2009-2018
+ * Copyright (C) Miroslav Lichvar  2009-2020
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -44,12 +44,7 @@
 #include "util.h"
 
 #ifdef FEAT_READLINE
-#ifdef USE_EDITLINE
 #include <editline/readline.h>
-#else
-#include <readline/readline.h>
-#include <readline/history.h>
-#endif
 #endif
 
 /* ================================================== */
@@ -222,7 +217,7 @@ open_socket(struct Address *addr)
 
   switch (addr->type) {
     case SCK_ADDR_IP:
-      sock_fd = SCK_OpenUdpSocket(&addr->addr.ip, NULL, 0);
+      sock_fd = SCK_OpenUdpSocket(&addr->addr.ip, NULL, NULL, 0);
       break;
     case SCK_ADDR_UNIX:
       /* Construct path of our socket.  Use the same directory as the server
@@ -960,39 +955,12 @@ process_cmd_cmddenyall(CMD_Request *msg, char *line)
 
 /* ================================================== */
 
-static int
-accheck_getaddr(char *line, IPAddr *addr)
-{
-  unsigned long a, b, c, d;
-  IPAddr ip;
-  char *p;
-  p = line;
-  if (!*p) {
-    return 0;
-  } else {
-    if (sscanf(p, "%lu.%lu.%lu.%lu", &a, &b, &c, &d) == 4) {
-      addr->family = IPADDR_INET4;
-      addr->addr.in4 = (a<<24) | (b<<16) | (c<<8) | d;
-      return 1;
-    } else {
-      if (DNS_Name2IPAddress(p, &ip, 1) != DNS_Success) {
-        return 0;
-      } else {
-        *addr = ip;
-        return 1;
-      }
-    }
-  }
-}
-
-/* ================================================== */
-
 static int
 process_cmd_accheck(CMD_Request *msg, char *line)
 {
   IPAddr ip;
   msg->command = htons(REQ_ACCHECK);
-  if (accheck_getaddr(line, &ip)) {
+  if (DNS_Name2IPAddress(line, &ip, 1) == DNS_Success) {
     UTI_IPHostToNetwork(&ip, &msg->data.ac_check.ip);
     return 1;
   } else {    
@@ -1008,7 +976,7 @@ process_cmd_cmdaccheck(CMD_Request *msg, char *line)
 {
   IPAddr ip;
   msg->command = htons(REQ_CMDACCHECK);
-  if (accheck_getaddr(line, &ip)) {
+  if (DNS_Name2IPAddress(line, &ip, 1) == DNS_Success) {
     UTI_IPHostToNetwork(&ip, &msg->data.ac_check.ip);
     return 1;
   } else {    
@@ -1084,11 +1052,11 @@ process_cmd_add_source(CMD_Request *msg, char *line)
   word = line;
   line = CPS_SplitWord(line);
 
-  if (!strcmp(word, "server")) {
+  if (!strcasecmp(word, "server")) {
     type = REQ_ADDSRC_SERVER;
-  } else if (!strcmp(word, "peer")) {
+  } else if (!strcasecmp(word, "peer")) {
     type = REQ_ADDSRC_PEER;
-  } else if (!strcmp(word, "pool")) {
+  } else if (!strcasecmp(word, "pool")) {
     type = REQ_ADDSRC_POOL;
   } else {
     LOG(LOGS_ERR, "Invalid syntax for add command");
@@ -1120,7 +1088,7 @@ process_cmd_add_source(CMD_Request *msg, char *line)
         assert(0);
       strncpy((char *)msg->data.ntp_source.name, data.name,
               sizeof (msg->data.ntp_source.name));
-      msg->data.ntp_source.port = htonl((unsigned long) data.port);
+      msg->data.ntp_source.port = htonl(data.port);
       msg->data.ntp_source.minpoll = htonl(data.params.minpoll);
       msg->data.ntp_source.maxpoll = htonl(data.params.maxpoll);
       msg->data.ntp_source.presend_minpoll = htonl(data.params.presend_minpoll);
@@ -1209,29 +1177,32 @@ give_help(void)
     "Time sources:\0\0"
     "sources [-a] [-v]\0Display information about current sources\0"
     "sourcestats [-a] [-v]\0Display statistics about collected measurements\0"
+    "selectdata [-a] [-v]\0Display information about source selection\0"
     "reselect\0Force reselecting synchronisation source\0"
     "reselectdist <dist>\0Modify reselection distance\0"
     "\0\0"
     "NTP sources:\0\0"
     "activity\0Check how many NTP sources are online/offline\0"
+    "authdata [-a] [-v]\0Display information about authentication\0"
     "ntpdata [<address>]\0Display information about last valid measurement\0"
     "add server <name> [options]\0Add new NTP server\0"
     "add pool <name> [options]\0Add new pool of NTP servers\0"
     "add peer <name> [options]\0Add new NTP peer\0"
     "delete <address>\0Remove server or peer\0"
-    "burst <n-good>/<n-max> [<mask>/<address>]\0Start rapid set of measurements\0"
+    "burst <n-good>/<n-max> [[<mask>/]<address>]\0Start rapid set of measurements\0"
     "maxdelay <address> <delay>\0Modify maximum valid sample delay\0"
     "maxdelayratio <address> <ratio>\0Modify maximum valid delay/minimum ratio\0"
     "maxdelaydevratio <address> <ratio>\0Modify maximum valid delay/deviation ratio\0"
     "minpoll <address> <poll>\0Modify minimum polling interval\0"
     "maxpoll <address> <poll>\0Modify maximum polling interval\0"
     "minstratum <address> <stratum>\0Modify minimum stratum\0"
-    "offline [<mask>/<address>]\0Set sources in subnet to offline status\0"
+    "offline [[<mask>/]<address>]\0Set sources in subnet to offline status\0"
-    "online [<mask>/<address>]\0Set sources in subnet to online status\0"
+    "online [[<mask>/]<address>]\0Set sources in subnet to online status\0"
     "onoffline\0Set all sources to online or offline status\0"
     "\0according to network configuration\0"
     "polltarget <address> <target>\0Modify poll target\0"
     "refresh\0Refresh IP addresses\0"
+    "reload sources\0Re-read *.sources files\0"
     "sourcename <address>\0Display original name\0"
     "\0\0"
     "Manual time input:\0\0"
@@ -1242,7 +1213,7 @@ give_help(void)
     "\0(e.g. Sep 25, 2015 16:30:05 or 16:30:05)\0"
     "\0\0NTP access:\0\0"
     "accheck <address>\0Check whether address is allowed\0"
-    "clients\0Report on clients that have accessed the server\0"
+    "clients [-p <packets>] [-k] [-r]\0Report on clients that accessed the server\0"
     "serverstats\0Display statistics of the server\0"
     "allow [<subnet>]\0Allow access to subnet as a default\0"
     "allow all [<subnet>]\0Allow access to subnet and all children\0"
@@ -1269,7 +1240,7 @@ give_help(void)
     "cyclelogs\0Close and re-open log files\0"
     "dump\0Dump measurements and NTS keys/cookies\0"
     "rekey\0Re-read keys\0"
-    "reset\0Drop all measurements\0"
+    "reset sources\0Drop all measurements\0"
     "shutdown\0Stop daemon\0"
     "\0\0"
     "Client commands:\0\0"
@@ -1291,7 +1262,7 @@ give_help(void)
 }
 
 /* ================================================== */
-/* Tab-completion when editline/readline is available */
+/* Tab-completion when editline is available */
 
 #ifdef FEAT_READLINE
 
@@ -1299,8 +1270,12 @@ enum {
   TAB_COMPLETE_BASE_CMDS,
   TAB_COMPLETE_ADD_OPTS,
   TAB_COMPLETE_MANUAL_OPTS,
+  TAB_COMPLETE_RELOAD_OPTS,
+  TAB_COMPLETE_RESET_OPTS,
   TAB_COMPLETE_SOURCES_OPTS,
   TAB_COMPLETE_SOURCESTATS_OPTS,
+  TAB_COMPLETE_AUTHDATA_OPTS,
+  TAB_COMPLETE_SELECTDATA_OPTS,
   TAB_COMPLETE_MAX_INDEX
 };
 
@@ -1311,28 +1286,33 @@ command_name_generator(const char *text, int state)
 {
   const char *name, **names[TAB_COMPLETE_MAX_INDEX];
   const char *base_commands[] = {
-    "accheck", "activity", "add", "allow", "burst",
+    "accheck", "activity", "add", "allow", "authdata", "burst",
     "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",
-    "polltarget", "quit", "refresh", "rekey", "reselect", "reselectdist", "reset",
+    "polltarget", "quit", "refresh", "rekey", "reload", "reselect", "reselectdist", "reset",
-    "retries", "rtcdata", "serverstats", "settime", "shutdown", "smoothing",
+    "retries", "rtcdata", "selectdata", "serverstats", "settime", "shutdown", "smoothing",
     "smoothtime", "sourcename", "sources", "sourcestats",
     "timeout", "tracking", "trimrtc", "waitsync", "writertc",
     NULL
   };
   const char *add_options[] = { "peer", "pool", "server", NULL };
   const char *manual_options[] = { "on", "off", "delete", "list", "reset", NULL };
-  const char *sources_options[] = { "-a", "-v", NULL };
+  const char *reset_options[] = { "sources", NULL };
-  const char *sourcestats_options[] = { "-a", "-v", NULL };
+  const char *reload_options[] = { "sources", NULL };
+  const char *common_source_options[] = { "-a", "-v", NULL };
   static int list_index, len;
 
   names[TAB_COMPLETE_BASE_CMDS] = base_commands;
   names[TAB_COMPLETE_ADD_OPTS] = add_options;
   names[TAB_COMPLETE_MANUAL_OPTS] = manual_options;
-  names[TAB_COMPLETE_SOURCES_OPTS] = sources_options;
+  names[TAB_COMPLETE_RELOAD_OPTS] = reload_options;
-  names[TAB_COMPLETE_SOURCESTATS_OPTS] = sourcestats_options;
+  names[TAB_COMPLETE_RESET_OPTS] = reset_options;
+  names[TAB_COMPLETE_AUTHDATA_OPTS] = common_source_options;
+  names[TAB_COMPLETE_SELECTDATA_OPTS] = common_source_options;
+  names[TAB_COMPLETE_SOURCES_OPTS] = common_source_options;
+  names[TAB_COMPLETE_SOURCESTATS_OPTS] = common_source_options;
 
   if (!state) {
     list_index = 0;
@@ -1360,8 +1340,16 @@ command_name_completion(const char *text, int start, int end)
 
   if (!strcmp(first, "add ")) {
     tab_complete_index = TAB_COMPLETE_ADD_OPTS;
+  } else if (!strcmp(first, "authdata ")) {
+    tab_complete_index = TAB_COMPLETE_AUTHDATA_OPTS;
   } else if (!strcmp(first, "manual ")) {
     tab_complete_index = TAB_COMPLETE_MANUAL_OPTS;
+  } else if (!strcmp(first, "reload ")) {
+    tab_complete_index = TAB_COMPLETE_RELOAD_OPTS;
+  } else if (!strcmp(first, "reset ")) {
+    tab_complete_index = TAB_COMPLETE_RESET_OPTS;
+  } else if (!strcmp(first, "selectdata ")) {
+    tab_complete_index = TAB_COMPLETE_SELECTDATA_OPTS;
   } else if (!strcmp(first, "sources ")) {
     tab_complete_index = TAB_COMPLETE_SOURCES_OPTS;
   } else if (!strcmp(first, "sourcestats ")) {
@@ -2056,7 +2044,7 @@ get_source_name(IPAddr *ip_addr, char *buf, int size)
   UTI_IPHostToNetwork(ip_addr, &request.data.ntp_source_name.ip_addr);
   if (!request_reply(&request, &reply, RPY_NTP_SOURCE_NAME, 0) ||
       reply.data.ntp_source_name.name[sizeof (reply.data.ntp_source_name.name) - 1] != '\0' ||
-      snprintf(buf, size, "%s", reply.data.ntp_source_name.name) >= size)
+      snprintf(buf, size, "%s", (char *)reply.data.ntp_source_name.name) >= size)
     return 0;
 
   /* Make sure the name is printable */
@@ -2153,8 +2141,8 @@ process_cmd_sources(char *line)
   if (verbose) {
     printf("\n");
     printf("  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.\n");
-    printf(" / .- Source state '*' = current synced, '+' = combined , '-' = not combined,\n");
+    printf(" / .- Source state '*' = current best, '+' = combined, '-' = not combined,\n");
-    printf("| /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.\n");
+    printf("| /             'x' = may be in error, '~' = too variable, '?' = unusable.\n");
     printf("||                                                 .- xxxx [ yyyy ] +/- zzzz\n");
     printf("||      Reachability register (octal) -.           |  xxxx = adjusted offset,\n");
     printf("||      Log2(Polling interval) --.      |          |  yyyy = measured offset,\n");
@@ -2196,10 +2184,10 @@ process_cmd_sources(char *line)
     }
 
     switch (ntohs(reply.data.source_data.state)) {
-      case RPY_SD_ST_SYNC:
+      case RPY_SD_ST_SELECTED:
         state_ch = '*';
         break;
-      case RPY_SD_ST_UNREACH:
+      case RPY_SD_ST_NONSELECTABLE:
         state_ch = '?';
         break;
       case RPY_SD_ST_FALSETICKER:
@@ -2208,10 +2196,10 @@ process_cmd_sources(char *line)
       case RPY_SD_ST_JITTERY:
         state_ch = '~';
         break;
-      case RPY_SD_ST_CANDIDATE:
+      case RPY_SD_ST_UNSELECTED:
         state_ch = '+';
         break;
-      case RPY_SD_ST_OUTLIER:
+      case RPY_SD_ST_SELECTABLE:
         state_ch = '-';
         break;
       default:
@@ -2358,6 +2346,91 @@ process_cmd_tracking(char *line)
 
 /* ================================================== */
 
+static int
+process_cmd_authdata(char *line)
+{
+  CMD_Request request;
+  CMD_Reply reply;
+  IPAddr ip_addr;
+  uint32_t i, source_mode, n_sources;
+  int all, verbose;
+  const char *mode_str;
+  char name[256];
+
+  parse_sources_options(line, &all, &verbose);
+
+  request.command = htons(REQ_N_SOURCES);
+  if (!request_reply(&request, &reply, RPY_N_SOURCES, 0))
+    return 0;
+
+  n_sources = ntohl(reply.data.n_sources.n_sources);
+
+  if (verbose) {
+    printf(    "                             .- Auth. mechanism (NTS, SK - symmetric key)\n");
+    printf(    "                            |   Key length -.  Cookie length (bytes) -.\n");
+    printf(    "                            |       (bits)  |  Num. of cookies --.    |\n");
+    printf(    "                            |               |  Key est. attempts  |   |\n");
+    printf(    "                            |               |           |         |   |\n");
+  }
+
+  print_header("Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen");
+
+  /*           "NNNNNNNNNNNNNNNNNNNNNNNNNNN MMMM KKKKK AAAA LLLL LLLL AAAA NNNN CCCC LLLL" */
+
+  for (i = 0; i < n_sources; i++) {
+    request.command = htons(REQ_SOURCE_DATA);
+    request.data.source_data.index = htonl(i);
+    if (!request_reply(&request, &reply, RPY_SOURCE_DATA, 0))
+      return 0;
+
+    source_mode = ntohs(reply.data.source_data.mode);
+    if (source_mode != RPY_SD_MD_CLIENT && source_mode != RPY_SD_MD_PEER)
+      continue;
+
+    UTI_IPNetworkToHost(&reply.data.source_data.ip_addr, &ip_addr);
+    if (!all && ip_addr.family == IPADDR_ID)
+      continue;
+
+    request.command = htons(REQ_AUTH_DATA);
+    request.data.auth_data.ip_addr = reply.data.source_data.ip_addr;
+    if (!request_reply(&request, &reply, RPY_AUTH_DATA, 0))
+      return 0;
+
+    format_name(name, sizeof (name), 25, 0, 0, 1, &ip_addr);
+
+    switch (ntohs(reply.data.auth_data.mode)) {
+      case RPY_AD_MD_NONE:
+        mode_str = "-";
+        break;
+      case RPY_AD_MD_SYMMETRIC:
+        mode_str = "SK";
+        break;
+      case RPY_AD_MD_NTS:
+        mode_str = "NTS";
+        break;
+      default:
+        mode_str = "?";
+        break;
+    }
+
+    print_report("%-27s %4s %5U %4d %4d %I %4d %4d %4d %4d\n",
+                 name, mode_str,
+                 (unsigned long)ntohl(reply.data.auth_data.key_id),
+                 ntohs(reply.data.auth_data.key_type),
+                 ntohs(reply.data.auth_data.key_length),
+                 (unsigned long)ntohl(reply.data.auth_data.last_ke_ago),
+                 ntohs(reply.data.auth_data.ke_attempts),
+                 ntohs(reply.data.auth_data.nak),
+                 ntohs(reply.data.auth_data.cookies),
+                 ntohs(reply.data.auth_data.cookie_length),
+                 REPORT_END);
+  }
+
+  return 1;
+}
+
+/* ================================================== */
+
 static int
 process_cmd_ntpdata(char *line)
 {
@@ -2474,6 +2547,81 @@ process_cmd_ntpdata(char *line)
 
 /* ================================================== */
 
+static int
+process_cmd_selectdata(char *line)
+{
+  CMD_Request request;
+  CMD_Reply reply;
+  uint32_t i, n_sources;
+  int all, verbose, conf_options, eff_options;
+  char name[256];
+  IPAddr ip_addr;
+
+  parse_sources_options(line, &all, &verbose);
+
+  request.command = htons(REQ_N_SOURCES);
+  if (!request_reply(&request, &reply, RPY_N_SOURCES, 0))
+    return 0;
+
+  n_sources = ntohl(reply.data.n_sources.n_sources);
+
+  if (verbose) {
+    printf(    "  .-- State: N - noselect, M - missing samples, d/D - large distance,\n");
+    printf(    " /           ~ - jittery, w/W - waits for others, T - not trusted,\n");
+    printf(    "|            x - falseticker, P - not preferred, U - waits for update,\n");
+    printf(    "|            S - stale, O - orphan, + - combined, * - best.\n");
+    printf(    "|        Effective options ------.  (N - noselect, P - prefer\n");
+    printf(    "|       Configured options -.     \\  T - trust, R - require)\n");
+    printf(    "|   Auth. enabled (Y/N) -.   \\     \\     Offset interval --.\n");
+    printf(    "|                        |    |     |                       |\n");
+  }
+
+  print_header("S Name/IP Address        Auth COpts EOpts Last Score     Interval   ");
+
+  /*           "S NNNNNNNNNNNNNNNNNNNNNNNNN A OOOO- OOOO- LLLL SSSSS LLLLLLL LLLLLLL" */
+
+  for (i = 0; i < n_sources; i++) {
+    request.command = htons(REQ_SELECT_DATA);
+    request.data.source_data.index = htonl(i);
+    if (!request_reply(&request, &reply, RPY_SELECT_DATA, 0))
+      return 0;
+
+    UTI_IPNetworkToHost(&reply.data.select_data.ip_addr, &ip_addr);
+    if (!all && ip_addr.family == IPADDR_ID)
+      continue;
+
+    format_name(name, sizeof (name), 25, ip_addr.family == IPADDR_UNSPEC,
+                ntohl(reply.data.select_data.ref_id), 1, &ip_addr);
+
+    conf_options = ntohs(reply.data.select_data.conf_options);
+    eff_options = ntohs(reply.data.select_data.eff_options);
+
+    print_report("%c %-25s %c %c%c%c%c%c %c%c%c%c%c %I %5.1f %+S %+S\n",
+                 reply.data.select_data.state_char,
+                 name,
+                 reply.data.select_data.authentication ? 'Y' : 'N',
+                 conf_options & RPY_SD_OPTION_NOSELECT ? 'N' : '-',
+                 conf_options & RPY_SD_OPTION_PREFER ? 'P' : '-',
+                 conf_options & RPY_SD_OPTION_TRUST ? 'T' : '-',
+                 conf_options & RPY_SD_OPTION_REQUIRE ? 'R' : '-',
+                 '-',
+                 eff_options & RPY_SD_OPTION_NOSELECT ? 'N' : '-',
+                 eff_options & RPY_SD_OPTION_PREFER ? 'P' : '-',
+                 eff_options & RPY_SD_OPTION_TRUST ? 'T' : '-',
+                 eff_options & RPY_SD_OPTION_REQUIRE ? 'R' : '-',
+                 '-',
+                 (unsigned long)ntohl(reply.data.select_data.last_sample_ago),
+                 UTI_FloatNetworkToHost(reply.data.select_data.score),
+                 UTI_FloatNetworkToHost(reply.data.select_data.lo_limit),
+                 UTI_FloatNetworkToHost(reply.data.select_data.hi_limit),
+                 REPORT_END);
+  }
+
+  return 1;
+}
+
+/* ================================================== */
+
 static int
 process_cmd_serverstats(char *line)
 {
@@ -2481,19 +2629,25 @@ process_cmd_serverstats(char *line)
   CMD_Reply reply;
 
   request.command = htons(REQ_SERVER_STATS);
-  if (!request_reply(&request, &reply, RPY_SERVER_STATS, 0))
+  if (!request_reply(&request, &reply, RPY_SERVER_STATS2, 0))
     return 0;
 
   print_report("NTP packets received       : %U\n"
                "NTP packets dropped        : %U\n"
                "Command packets received   : %U\n"
                "Command packets dropped    : %U\n"
-               "Client log records dropped : %U\n",
+               "Client log records dropped : %U\n"
+               "NTS-KE connections accepted: %U\n"
+               "NTS-KE connections dropped : %U\n"
+               "Authenticated NTP packets  : %U\n",
                (unsigned long)ntohl(reply.data.server_stats.ntp_hits),
                (unsigned long)ntohl(reply.data.server_stats.ntp_drops),
                (unsigned long)ntohl(reply.data.server_stats.cmd_hits),
                (unsigned long)ntohl(reply.data.server_stats.cmd_drops),
                (unsigned long)ntohl(reply.data.server_stats.log_drops),
+               (unsigned long)ntohl(reply.data.server_stats.nke_hits),
+               (unsigned long)ntohl(reply.data.server_stats.nke_drops),
+               (unsigned long)ntohl(reply.data.server_stats.ntp_auth_hits),
                REPORT_END);
 
   return 1;
@@ -2591,20 +2745,46 @@ process_cmd_clients(char *line)
   CMD_Request request;
   CMD_Reply reply;
   IPAddr ip;
-  uint32_t i, n_clients, next_index, n_indices;
+  uint32_t i, n_clients, next_index, n_indices, min_hits, reset;
   RPY_ClientAccesses_Client *client;
-  char name[50];
+  char header[80], name[50], *opt, *arg;
+  int nke;
 
   next_index = 0;
+  min_hits = 0;
+  reset = 0;
+  nke = 0;
 
-  print_header("Hostname                      NTP   Drop Int IntL Last     Cmd   Drop Int  Last");
+  while (*line) {
+    opt = line;
+    line = CPS_SplitWord(line);
+    if (strcmp(opt, "-k") == 0) {
+      nke = 1;
+    } else if (strcmp(opt, "-p") == 0) {
+      arg = line;
+      line = CPS_SplitWord(line);
+      if (sscanf(arg, "%"SCNu32, &min_hits) != 1) {
+        LOG(LOGS_ERR, "Invalid syntax for clients command");
+        return 0;
+      }
+    } else if (strcmp(opt, "-r") == 0) {
+      reset = 1;
+    }
+  }
+
+  snprintf(header, sizeof (header),
+           "Hostname                      NTP   Drop Int IntL Last  %6s   Drop Int  Last",
+           nke ? "NTS-KE" : "Cmd");
+  print_header(header);
 
   while (1) {
-    request.command = htons(REQ_CLIENT_ACCESSES_BY_INDEX2);
+    request.command = htons(REQ_CLIENT_ACCESSES_BY_INDEX3);
     request.data.client_accesses_by_index.first_index = htonl(next_index);
     request.data.client_accesses_by_index.n_clients = htonl(MAX_CLIENT_ACCESSES);
+    request.data.client_accesses_by_index.min_hits = htonl(min_hits);
+    request.data.client_accesses_by_index.reset = htonl(reset);
 
-    if (!request_reply(&request, &reply, RPY_CLIENT_ACCESSES_BY_INDEX2, 0))
+    if (!request_reply(&request, &reply, RPY_CLIENT_ACCESSES_BY_INDEX3, 0))
       return 0;
 
     n_clients = ntohl(reply.data.client_accesses_by_index.n_clients);
@@ -2629,10 +2809,11 @@ process_cmd_clients(char *line)
                    client->ntp_interval,
                    client->ntp_timeout_interval,
                    (unsigned long)ntohl(client->last_ntp_hit_ago),
-                   (unsigned long)ntohl(client->cmd_hits),
+                   (unsigned long)ntohl(nke ? client->nke_hits : client->cmd_hits),
-                   (unsigned long)ntohl(client->cmd_drops),
+                   (unsigned long)ntohl(nke ? client->nke_drops : client->cmd_drops),
-                   client->cmd_interval,
+                   nke ? client->nke_interval : client->cmd_interval,
-                   (unsigned long)ntohl(client->last_cmd_hit_ago),
+                   (unsigned long)ntohl(nke ? client->last_nke_hit_ago :
+                                              client->last_cmd_hit_ago),
                    REPORT_END);
     }
 
@@ -2836,10 +3017,32 @@ process_cmd_shutdown(CMD_Request *msg, char *line)
 
 /* ================================================== */
 
-static void
+static int
+process_cmd_reload(CMD_Request *msg, char *line)
+{
+  if (!strcmp(line, "sources")) {
+    msg->command = htons(REQ_RELOAD_SOURCES);
+  } else {
+    LOG(LOGS_ERR, "Invalid syntax for reload command");
+    return 0;
+  }
+
+  return 1;
+}
+
+/* ================================================== */
+
+static int
 process_cmd_reset(CMD_Request *msg, char *line)
 {
-  msg->command = htons(REQ_RESET);
+  if (!strcmp(line, "sources")) {
+    msg->command = htons(REQ_RESET_SOURCES);
+  } else {
+    LOG(LOGS_ERR, "Invalid syntax for reset command");
+    return 0;
+  }
+
+  return 1;
 }
 
 /* ================================================== */
@@ -2959,26 +3162,35 @@ process_cmd_retries(const char *line)
 static int
 process_cmd_keygen(char *line)
 {
+  unsigned int i, args, cmac_length, length, id = 1, bits = 160;
   unsigned char key[512];
-  char type[17];
+  const char *type;
-  unsigned int i, cmac_length, length, id = 1, bits = 160;
+  char *words[3];
 
 #ifdef FEAT_SECHASH
-  snprintf(type, sizeof (type), "SHA1");
+  type = "SHA1";
 #else
-  snprintf(type, sizeof (type), "MD5");
+  type = "MD5";
 #endif
 
-  if (sscanf(line, "%u %16s %u", &id, type, &bits))
+  args = UTI_SplitString(line, words, 3);
-    ;
+  if (args >= 2)
+    type = words[1];
+
+  if (args > 3 ||
+      (args >= 1 && sscanf(words[0], "%u", &id) != 1) ||
+      (args >= 3 && sscanf(words[2], "%u", &bits) != 1)) {
+    LOG(LOGS_ERR, "Invalid syntax for keygen command");
+    return 0;
+  }
 
 #ifdef HAVE_CMAC
-  cmac_length = CMC_GetKeyLength(type);
+  cmac_length = CMC_GetKeyLength(UTI_CmacNameToAlgorithm(type));
 #else
   cmac_length = 0;
 #endif
 
-  if (HSH_GetHashId(type) >= 0) {
+  if (HSH_GetHashId(UTI_HashNameToAlgorithm(type)) >= 0) {
     length = (bits + 7) / 8;
   } else if (cmac_length > 0) {
     length = cmac_length;
@@ -3038,6 +3250,9 @@ process_line(char *line)
     } else {
       do_normal_submit = process_cmd_allow(&tx_message, line);
     }
+  } else if (!strcmp(command, "authdata")) {
+    do_normal_submit = 0;
+    ret = process_cmd_authdata(line);
   } else if (!strcmp(command, "burst")) {
     do_normal_submit = process_cmd_burst(&tx_message, line);
   } else if (!strcmp(command, "clients")) {
@@ -3134,18 +3349,23 @@ process_line(char *line)
     process_cmd_refresh(&tx_message, line);
   } else if (!strcmp(command, "rekey")) {
     process_cmd_rekey(&tx_message, line);
+  } else if (!strcmp(command, "reload")) {
+    do_normal_submit = process_cmd_reload(&tx_message, line);
   } else if (!strcmp(command, "reselect")) {
     process_cmd_reselect(&tx_message, line);
   } else if (!strcmp(command, "reselectdist")) {
     do_normal_submit = process_cmd_reselectdist(&tx_message, line);
   } else if (!strcmp(command, "reset")) {
-    process_cmd_reset(&tx_message, line);
+    do_normal_submit = process_cmd_reset(&tx_message, line);
   } else if (!strcmp(command, "retries")) {
     ret = process_cmd_retries(line);
     do_normal_submit = 0;
   } else if (!strcmp(command, "rtcdata")) {
     do_normal_submit = 0;
     ret = process_cmd_rtcreport(line);
+  } else if (!strcmp(command, "selectdata")) {
+    do_normal_submit = 0;
+    ret = process_cmd_selectdata(line);
   } else if (!strcmp(command, "serverstats")) {
     do_normal_submit = 0;
     ret = process_cmd_serverstats(line);
@@ -3251,7 +3471,7 @@ static void
 display_gpl(void)
 {
     printf("chrony version %s\n"
-           "Copyright (C) 1997-2003, 2007, 2009-2019 Richard P. Curnow and others\n"
+           "Copyright (C) 1997-2003, 2007, 2009-2020 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",
@@ -3358,7 +3578,7 @@ main(int argc, char **argv)
 
   UTI_SetQuitSignalsHandler(signal_handler, 0);
 
-  SCK_Initialise();
+  SCK_Initialise(IPADDR_UNSPEC);
   server_addresses = get_addresses(hostnames, port);
 
   if (!open_io())

clientlog.c

@@ -44,20 +44,17 @@
 #include "util.h"
 #include "logging.h"
 
+#define MAX_SERVICES 3
+
 typedef struct {
   IPAddr ip_addr;
-  uint32_t last_ntp_hit;
+  uint32_t last_hit[MAX_SERVICES];
-  uint32_t last_cmd_hit;
+  uint32_t hits[MAX_SERVICES];
-  uint32_t ntp_hits;
+  uint16_t drops[MAX_SERVICES];
-  uint32_t cmd_hits;
+  uint16_t tokens[MAX_SERVICES];
-  uint16_t ntp_drops;
+  int8_t rate[MAX_SERVICES];
-  uint16_t cmd_drops;
-  uint16_t ntp_tokens;
-  uint16_t cmd_tokens;
-  int8_t ntp_rate;
-  int8_t cmd_rate;
   int8_t ntp_timeout_rate;
-  uint8_t flags;
+  uint8_t drop_flags;
   NTP_int64 ntp_rx_ts;
   NTP_int64 ntp_tx_ts;
 } Record;
@@ -104,15 +101,12 @@ static uint32_t ts_offset;
 #define MIN_LIMIT_BURST 1
 #define MAX_LIMIT_BURST 255
 
-static uint16_t max_ntp_tokens;
+static uint16_t max_tokens[MAX_SERVICES];
-static uint16_t max_cmd_tokens;
+static uint16_t tokens_per_hit[MAX_SERVICES];
-static uint16_t ntp_tokens_per_packet;
-static uint16_t cmd_tokens_per_packet;
 
 /* Reduction of token rates to avoid overflow of 16-bit counters.  Negative
    shift is used for coarse limiting with intervals shorter than -TS_FRAC. */
-static int ntp_token_shift;
+static int token_shift[MAX_SERVICES];
-static int cmd_token_shift;
 
 /* Rates at which responses are randomly allowed (in log2) when the
    buckets don't have enough tokens.  This is necessary in order to
@@ -122,23 +116,18 @@ static int cmd_token_shift;
 #define MIN_LEAK_RATE 1
 #define MAX_LEAK_RATE 4
 
-static int ntp_leak_rate;
+static int leak_rate[MAX_SERVICES];
-static int cmd_leak_rate;
 
-/* Flag indicating whether the last response was dropped */
+/* Limit intervals in log2 */
-#define FLAG_NTP_DROPPED 0x1
+static int limit_interval[MAX_SERVICES];
-
-/* NTP limit interval in log2 */
-static int ntp_limit_interval;
 
 /* Flag indicating whether facility is turned on or not */
 static int active;
 
 /* Global statistics */
-static uint32_t total_ntp_hits;
+static uint32_t total_hits[MAX_SERVICES];
-static uint32_t total_cmd_hits;
+static uint32_t total_drops[MAX_SERVICES];
-static uint32_t total_ntp_drops;
+static uint32_t total_ntp_auth_hits;
-static uint32_t total_cmd_drops;
 static uint32_t total_record_drops;
 
 #define NSEC_PER_SEC 1000000000U
@@ -161,12 +150,28 @@ compare_ts(uint32_t x, uint32_t y)
 
 /* ================================================== */
 
+static int
+compare_total_hits(Record *x, Record *y)
+{
+  uint32_t x_hits, y_hits;
+  int i;
+
+  for (i = 0, x_hits = y_hits = 0; i < MAX_SERVICES; i++) {
+    x_hits += x->hits[i];
+    y_hits += y->hits[i];
+  }
+
+  return x_hits > y_hits ? 1 : -1;
+}
+
+/* ================================================== */
+
 static Record *
 get_record(IPAddr *ip)
 {
-  unsigned int first, i;
+  uint32_t last_hit, oldest_hit = 0;
-  time_t last_hit, oldest_hit = 0;
   Record *record, *oldest_record;
+  unsigned int first, i, j;
 
   if (!active || (ip->family != IPADDR_INET4 && ip->family != IPADDR_INET6))
     return NULL;
@@ -184,12 +189,13 @@ get_record(IPAddr *ip)
       if (record->ip_addr.family == IPADDR_UNSPEC)
         break;
 
-      last_hit = compare_ts(record->last_ntp_hit, record->last_cmd_hit) > 0 ?
+      for (j = 0; j < MAX_SERVICES; j++) {
-                 record->last_ntp_hit : record->last_cmd_hit;
+        if (j == 0 || compare_ts(last_hit, record->last_hit[j]) < 0)
+          last_hit = record->last_hit[j];
+      }
 
       if (!oldest_record || compare_ts(oldest_hit, last_hit) > 0 ||
-          (oldest_hit == last_hit && record->ntp_hits + record->cmd_hits <
+          (oldest_hit == last_hit && compare_total_hits(oldest_record, record) > 0)) {
-           oldest_record->ntp_hits + oldest_record->cmd_hits)) {
         oldest_record = record;
         oldest_hit = last_hit;
       }
@@ -211,14 +217,18 @@ get_record(IPAddr *ip)
   }
 
   record->ip_addr = *ip;
-  record->last_ntp_hit = record->last_cmd_hit = INVALID_TS;
+  for (i = 0; i < MAX_SERVICES; i++)
-  record->ntp_hits = record->cmd_hits = 0;
+    record->last_hit[i] = INVALID_TS;
-  record->ntp_drops = record->cmd_drops = 0;
+  for (i = 0; i < MAX_SERVICES; i++)
-  record->ntp_tokens = max_ntp_tokens;
+    record->hits[i] = 0;
-  record->cmd_tokens = max_cmd_tokens;
+  for (i = 0; i < MAX_SERVICES; i++)
-  record->ntp_rate = record->cmd_rate = INVALID_RATE;
+    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->flags = 0;
+  record->drop_flags = 0;
   UTI_ZeroNtp64(&record->ntp_rx_ts);
   UTI_ZeroNtp64(&record->ntp_tx_ts);
 
@@ -306,31 +316,43 @@ set_bucket_params(int interval, int burst, uint16_t *max_tokens,
 void
 CLG_Initialise(void)
 {
-  int interval, burst, leak_rate;
+  int i, interval, burst, lrate;
 
-  max_ntp_tokens = max_cmd_tokens = 0;
+  for (i = 0; i < MAX_SERVICES; i++) {
-  ntp_tokens_per_packet = cmd_tokens_per_packet = 0;
+    max_tokens[i] = 0;
-  ntp_token_shift = cmd_token_shift = 0;
+    tokens_per_hit[i] = 0;
-  ntp_leak_rate = cmd_leak_rate = 0;
+    token_shift[i] = 0;
-  ntp_limit_interval = MIN_LIMIT_INTERVAL;
+    leak_rate[i] = 0;
+    limit_interval[i] = MIN_LIMIT_INTERVAL;
 
-  if (CNF_GetNTPRateLimit(&interval, &burst, &leak_rate)) {
+    switch (i) {
-    set_bucket_params(interval, burst, &max_ntp_tokens, &ntp_tokens_per_packet,
+      case CLG_NTP:
-                      &ntp_token_shift);
+        if (!CNF_GetNTPRateLimit(&interval, &burst, &lrate))
-    ntp_leak_rate = CLAMP(MIN_LEAK_RATE, leak_rate, MAX_LEAK_RATE);
+          continue;
-    ntp_limit_interval = CLAMP(MIN_LIMIT_INTERVAL, interval, MAX_LIMIT_INTERVAL);
+        break;
-  }
+      case CLG_NTSKE:
+        if (!CNF_GetNtsRateLimit(&interval, &burst, &lrate))
+          continue;
+        break;
+      case CLG_CMDMON:
+        if (!CNF_GetCommandRateLimit(&interval, &burst, &lrate))
+          continue;
+        break;
+      default:
+        assert(0);
+    }
 
-  if (CNF_GetCommandRateLimit(&interval, &burst, &leak_rate)) {
+    set_bucket_params(interval, burst, &max_tokens[i], &tokens_per_hit[i], &token_shift[i]);
-    set_bucket_params(interval, burst, &max_cmd_tokens, &cmd_tokens_per_packet,
+    leak_rate[i] = CLAMP(MIN_LEAK_RATE, lrate, MAX_LEAK_RATE);
-                      &cmd_token_shift);
+    limit_interval[i] = CLAMP(MIN_LIMIT_INTERVAL, interval, MAX_LIMIT_INTERVAL);
-    cmd_leak_rate = CLAMP(MIN_LEAK_RATE, leak_rate, MAX_LEAK_RATE);
   }
 
   active = !CNF_GetNoClientLog();
   if (!active) {
-    if (ntp_leak_rate || cmd_leak_rate)
+    for (i = 0; i < MAX_SERVICES; i++) {
-      LOG_FATAL("ratelimit cannot be used with noclientlog");
+      if (leak_rate[i] != 0)
+        LOG_FATAL("Rate limiting cannot be enabled with noclientlog");
+    }
     return;
   }
 
@@ -339,6 +361,7 @@ CLG_Initialise(void)
      table where two copies exist at the same time. */
   max_slots = CNF_GetClientLogLimit() / (sizeof (Record) * SLOT_SIZE * 3 / 2);
   max_slots = CLAMP(MIN_SLOTS, max_slots, MAX_SLOTS);
+  DEBUG_LOG("Max records %u", 1U << ((int)round(log(max_slots) / log(2)) + SLOT_BITS));
 
   slots = 0;
   records = NULL;
@@ -380,30 +403,33 @@ get_ts_from_timespec(struct timespec *ts)
 /* ================================================== */
 
 static void
-update_record(struct timespec *now, uint32_t *last_hit, uint32_t *hits,
+update_record(CLG_Service service, Record *record, struct timespec *now)
-              uint16_t *tokens, uint32_t max_tokens, int token_shift, int8_t *rate)
 {
-  uint32_t interval, now_ts, prev_hit, new_tokens;
+  uint32_t interval, now_ts, prev_hit, tokens;
-  int interval2;
+  int interval2, tshift, mtokens;
+  int8_t *rate;
 
   now_ts = get_ts_from_timespec(now);
 
-  prev_hit = *last_hit;
+  prev_hit = record->last_hit[service];
-  *last_hit = now_ts;
+  record->last_hit[service] = now_ts;
-  (*hits)++;
+  record->hits[service]++;
 
   interval = now_ts - prev_hit;
 
   if (prev_hit == INVALID_TS || (int32_t)interval < 0)
     return;
 
-  if (token_shift >= 0)
+  tshift = token_shift[service];
-    new_tokens = (now_ts >> token_shift) - (prev_hit >> token_shift);
+  mtokens = max_tokens[service];
-  else if (now_ts - prev_hit > max_tokens)
+
-    new_tokens = max_tokens;
+  if (tshift >= 0)
+    tokens = (now_ts >> tshift) - (prev_hit >> tshift);
+  else if (now_ts - prev_hit > mtokens)
+    tokens = mtokens;
   else
-    new_tokens = (now_ts - prev_hit) << -token_shift;
+    tokens = (now_ts - prev_hit) << -tshift;
-  *tokens = MIN(*tokens + new_tokens, max_tokens);
+  record->tokens[service] = MIN(record->tokens[service] + tokens, mtokens);
 
   /* Convert the interval to scaled and rounded log2 */
   if (interval) {
@@ -418,6 +444,11 @@ update_record(struct timespec *now, uint32_t *last_hit, uint32_t *hits,
     interval2 = -RATE_SCALE * (TS_FRAC + 1);
   }
 
+  /* For the NTP service, update one of the two rates depending on whether
+     the previous request of the client had a reply or it timed out */
+  rate = service == CLG_NTP && record->drop_flags & (1U << service) ?
+           &record->ntp_timeout_rate : &record->rate[service];
+
   /* Update the rate in a rough approximation of exponential moving average */
   if (*rate == INVALID_RATE) {
     *rate = -interval2;
@@ -457,50 +488,33 @@ CLG_GetClientIndex(IPAddr *client)
 
 /* ================================================== */
 
-int
+static void
-CLG_LogNTPAccess(IPAddr *client, struct timespec *now)
+check_service_number(CLG_Service service)
 {
-  Record *record;
+  assert(service >= 0 && service <= MAX_SERVICES);
-
-  total_ntp_hits++;
-
-  record = get_record(client);
-  if (record == NULL)
-    return -1;
-
-  /* Update one of the two rates depending on whether the previous request
-     of the client had a reply or it timed out */
-  update_record(now, &record->last_ntp_hit, &record->ntp_hits,
-                &record->ntp_tokens, max_ntp_tokens, ntp_token_shift,
-                record->flags & FLAG_NTP_DROPPED ?
-                &record->ntp_timeout_rate : &record->ntp_rate);
-
-  DEBUG_LOG("NTP hits %"PRIu32" rate %d trate %d tokens %d",
-            record->ntp_hits, record->ntp_rate, record->ntp_timeout_rate,
-            record->ntp_tokens);
-
-  return get_index(record);
 }
 
 /* ================================================== */
 
 int
-CLG_LogCommandAccess(IPAddr *client, struct timespec *now)
+CLG_LogServiceAccess(CLG_Service service, IPAddr *client, struct timespec *now)
 {
   Record *record;
 
-  total_cmd_hits++;
+  check_service_number(service);
+
+  total_hits[service]++;
 
   record = get_record(client);
   if (record == NULL)
     return -1;
 
-  update_record(now, &record->last_cmd_hit, &record->cmd_hits,
+  update_record(service, record, now);
-                &record->cmd_tokens, max_cmd_tokens, cmd_token_shift,
-                &record->cmd_rate);
 
-  DEBUG_LOG("Cmd hits %"PRIu32" rate %d tokens %d",
+  DEBUG_LOG("service %d hits %"PRIu32" rate %d trate %d tokens %d",
-            record->cmd_hits, record->cmd_rate, record->cmd_tokens);
+            (int)service, record->hits[service], record->rate[service],
+            service == CLG_NTP ? record->ntp_timeout_rate : INVALID_RATE,
+            record->tokens[service]);
 
   return get_index(record);
 }
@@ -530,71 +544,53 @@ limit_response_random(int leak_rate)
 /* ================================================== */
 
 int
-CLG_LimitNTPResponseRate(int index)
+CLG_LimitServiceRate(CLG_Service service, int index)
 {
   Record *record;
   int drop;
 
-  if (!ntp_tokens_per_packet)
+  check_service_number(service);
+
+  if (tokens_per_hit[service] == 0)
     return 0;
 
   record = ARR_GetElement(records, index);
-  record->flags &= ~FLAG_NTP_DROPPED;
+  record->drop_flags &= ~(1U << service);
 
-  if (record->ntp_tokens >= ntp_tokens_per_packet) {
+  if (record->tokens[service] >= tokens_per_hit[service]) {
-    record->ntp_tokens -= ntp_tokens_per_packet;
+    record->tokens[service] -= tokens_per_hit[service];
     return 0;
   }
 
-  drop = limit_response_random(ntp_leak_rate);
+  drop = limit_response_random(leak_rate[service]);
 
-  /* Poorly implemented clients may send new requests at even a higher rate
+  /* Poorly implemented NTP clients can send requests at a higher rate
      when they are not getting replies.  If the request rate seems to be more
      than twice as much as when replies are sent, give up on rate limiting to
      reduce the amount of traffic.  Invert the sense of the leak to respond to
      most of the requests, but still keep the estimated rate updated. */
-  if (record->ntp_timeout_rate != INVALID_RATE &&
+  if (service == CLG_NTP && record->ntp_timeout_rate != INVALID_RATE &&
-      record->ntp_timeout_rate > record->ntp_rate + RATE_SCALE)
+      record->ntp_timeout_rate > record->rate[service] + RATE_SCALE)
     drop = !drop;
 
   if (!drop) {
-    record->ntp_tokens = 0;
+    record->tokens[service] = 0;
     return 0;
   }
 
-  record->flags |= FLAG_NTP_DROPPED;
+  record->drop_flags |= 1U << service;
-  record->ntp_drops++;
+  record->drops[service]++;
-  total_ntp_drops++;
+  total_drops[service]++;
 
   return 1;
 }
 
 /* ================================================== */
 
-int
+void
-CLG_LimitCommandResponseRate(int index)
+CLG_LogAuthNtpRequest(void)
 {
-  Record *record;
+  total_ntp_auth_hits++;
-
-  if (!cmd_tokens_per_packet)
-    return 0;
-
-  record = ARR_GetElement(records, index);
-
-  if (record->cmd_tokens >= cmd_tokens_per_packet) {
-    record->cmd_tokens -= cmd_tokens_per_packet;
-    return 0;
-  }
-
-  if (!limit_response_random(cmd_leak_rate)) {
-    record->cmd_tokens = 0;
-    return 0;
-  }
-
-  record->cmd_drops++;
-  total_cmd_drops++;
-
-  return 1;
 }
 
 /* ================================================== */
@@ -614,7 +610,7 @@ void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts)
 int
 CLG_GetNtpMinPoll(void)
 {
-  return ntp_limit_interval;
+  return limit_interval[CLG_NTP];
 }
 
 /* ================================================== */
@@ -653,10 +649,12 @@ static uint32_t get_last_ago(uint32_t x, uint32_t y)
 /* ================================================== */
 
 int
-CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timespec *now)
+CLG_GetClientAccessReportByIndex(int index, int reset, uint32_t min_hits,
+                                 RPT_ClientAccessByIndex_Report *report, struct timespec *now)
 {
   Record *record;
   uint32_t now_ts;
+  int i, r;
 
   if (!active || index < 0 || index >= ARR_GetSize(records))
     return 0;
@@ -666,20 +664,44 @@ CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *repo
   if (record->ip_addr.family == IPADDR_UNSPEC)
     return 0;
 
-  now_ts = get_ts_from_timespec(now);
+  if (min_hits == 0) {
+    r = 1;
+  } else {
+    for (i = r = 0; i < MAX_SERVICES; i++) {
+      if (record->hits[i] >= min_hits) {
+        r = 1;
+        break;
+      }
+    }
+  }
 
-  report->ip_addr = record->ip_addr;
+  if (r) {
-  report->ntp_hits = record->ntp_hits;
+    now_ts = get_ts_from_timespec(now);
-  report->cmd_hits = record->cmd_hits;
-  report->ntp_drops = record->ntp_drops;
-  report->cmd_drops = record->cmd_drops;
-  report->ntp_interval = get_interval(record->ntp_rate);
-  report->cmd_interval = get_interval(record->cmd_rate);
-  report->ntp_timeout_interval = get_interval(record->ntp_timeout_rate);
-  report->last_ntp_hit_ago = get_last_ago(now_ts, record->last_ntp_hit);
-  report->last_cmd_hit_ago = get_last_ago(now_ts, record->last_cmd_hit);
 
-  return 1;
+    report->ip_addr = record->ip_addr;
+    report->ntp_hits = record->hits[CLG_NTP];
+    report->nke_hits = record->hits[CLG_NTSKE];
+    report->cmd_hits = record->hits[CLG_CMDMON];
+    report->ntp_drops = record->drops[CLG_NTP];
+    report->nke_drops = record->drops[CLG_NTSKE];
+    report->cmd_drops = record->drops[CLG_CMDMON];
+    report->ntp_interval = get_interval(record->rate[CLG_NTP]);
+    report->nke_interval = get_interval(record->rate[CLG_NTSKE]);
+    report->cmd_interval = get_interval(record->rate[CLG_CMDMON]);
+    report->ntp_timeout_interval = get_interval(record->ntp_timeout_rate);
+    report->last_ntp_hit_ago = get_last_ago(now_ts, record->last_hit[CLG_NTP]);
+    report->last_nke_hit_ago = get_last_ago(now_ts, record->last_hit[CLG_NTSKE]);
+    report->last_cmd_hit_ago = get_last_ago(now_ts, record->last_hit[CLG_CMDMON]);
+  }
+
+  if (reset) {
+    for (i = 0; i < MAX_SERVICES; i++) {
+      record->hits[i] = 0;
+      record->drops[i] = 0;
+    }
+  }
+
+  return r;
 }
 
 /* ================================================== */
@@ -687,9 +709,12 @@ CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *repo
 void
 CLG_GetServerStatsReport(RPT_ServerStatsReport *report)
 {
-  report->ntp_hits = total_ntp_hits;
+  report->ntp_hits = total_hits[CLG_NTP];
-  report->cmd_hits = total_cmd_hits;
+  report->nke_hits = total_hits[CLG_NTSKE];
-  report->ntp_drops = total_ntp_drops;
+  report->cmd_hits = total_hits[CLG_CMDMON];
-  report->cmd_drops = total_cmd_drops;
+  report->ntp_drops = total_drops[CLG_NTP];
+  report->nke_drops = total_drops[CLG_NTSKE];
+  report->cmd_drops = total_drops[CLG_CMDMON];
   report->log_drops = total_record_drops;
+  report->ntp_auth_hits = total_ntp_auth_hits;
 }

clientlog.h

@@ -31,20 +31,27 @@
 #include "sysincl.h"
 #include "reports.h"
 
+typedef enum {
+  CLG_NTP = 0,
+  CLG_NTSKE,
+  CLG_CMDMON,
+} CLG_Service;
+
 extern void CLG_Initialise(void);
 extern void CLG_Finalise(void);
 extern int CLG_GetClientIndex(IPAddr *client);
-extern int CLG_LogNTPAccess(IPAddr *client, struct timespec *now);
+extern int CLG_LogServiceAccess(CLG_Service service, IPAddr *client, struct timespec *now);
-extern int CLG_LogCommandAccess(IPAddr *client, struct timespec *now);
+extern int CLG_LimitServiceRate(CLG_Service service, int index);
-extern int CLG_LimitNTPResponseRate(int index);
+extern void CLG_LogAuthNtpRequest(void);
-extern int CLG_LimitCommandResponseRate(int index);
 extern void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts);
 extern int CLG_GetNtpMinPoll(void);
 
 /* And some reporting functions, for use by chronyc. */
 
 extern int CLG_GetNumberOfIndices(void);
-extern int CLG_GetClientAccessReportByIndex(int index, RPT_ClientAccessByIndex_Report *report, struct timespec *now);
+extern int CLG_GetClientAccessReportByIndex(int index, int reset, uint32_t min_hits,
+                                            RPT_ClientAccessByIndex_Report *report,
+                                            struct timespec *now);
 extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
 
 #endif /* GOT_CLIENTLOG_H */

cmac.h

@@ -28,13 +28,20 @@
 #ifndef GOT_CMAC_H
 #define GOT_CMAC_H
 
+/* Avoid overlapping with the hash enumeration */
+typedef enum {
+  CMC_INVALID = 0,
+  CMC_AES128 = 13,
+  CMC_AES256 = 14,
+} CMC_Algorithm;
+
 typedef struct CMC_Instance_Record *CMC_Instance;
 
-extern unsigned int CMC_GetKeyLength(const char *cipher);
+extern int CMC_GetKeyLength(CMC_Algorithm algorithm);
-extern CMC_Instance CMC_CreateInstance(const char *cipher, const unsigned char *key,
+extern CMC_Instance CMC_CreateInstance(CMC_Algorithm algorithm, const unsigned char *key,
-                                       unsigned int length);
+                                       int length);
-extern unsigned int CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
+extern int CMC_Hash(CMC_Instance inst, const void *in, int in_len,
-                             unsigned char *out, unsigned int out_len);
+                    unsigned char *out, int out_len);
 extern void CMC_DestroyInstance(CMC_Instance inst);
 
 #endif

cmac_nettle.c

@@ -44,12 +44,12 @@ struct CMC_Instance_Record {
 
 /* ================================================== */
 
-unsigned int
+int
-CMC_GetKeyLength(const char *cipher)
+CMC_GetKeyLength(CMC_Algorithm algorithm)
 {
-  if (strcmp(cipher, "AES128") == 0)
+  if (algorithm == CMC_AES128)
     return AES128_KEY_SIZE;
-  else if (strcmp(cipher, "AES256") == 0)
+  else if (algorithm == CMC_AES256)
     return AES256_KEY_SIZE;
   return 0;
 }
@@ -57,11 +57,11 @@ CMC_GetKeyLength(const char *cipher)
 /* ================================================== */
 
 CMC_Instance
-CMC_CreateInstance(const char *cipher, const unsigned char *key, unsigned int length)
+CMC_CreateInstance(CMC_Algorithm algorithm, const unsigned char *key, int length)
 {
   CMC_Instance inst;
 
-  if (length == 0 || length != CMC_GetKeyLength(cipher))
+  if (length <= 0 || length != CMC_GetKeyLength(algorithm))
     return NULL;
 
   inst = MallocNew(struct CMC_Instance_Record);
@@ -83,10 +83,12 @@ CMC_CreateInstance(const char *cipher, const unsigned char *key, unsigned int le
 
 /* ================================================== */
 
-unsigned int
+int
-CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
+CMC_Hash(CMC_Instance inst, const void *in, int in_len, unsigned char *out, int out_len)
-         unsigned char *out, unsigned int out_len)
 {
+  if (in_len < 0 || out_len < 0)
+    return 0;
+
   if (out_len > CMAC128_DIGEST_SIZE)
     out_len = CMAC128_DIGEST_SIZE;
 

cmdmon.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2016, 2018
+ * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2020
  * 
  * 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
@@ -135,7 +135,11 @@ static const char permissions[] = {
   PERMIT_AUTH, /* ONOFFLINE */
   PERMIT_AUTH, /* ADD_SOURCE */
   PERMIT_OPEN, /* NTP_SOURCE_NAME */
-  PERMIT_AUTH, /* RESET */
+  PERMIT_AUTH, /* RESET_SOURCES */
+  PERMIT_AUTH, /* AUTH_DATA */
+  PERMIT_AUTH, /* CLIENT_ACCESSES_BY_INDEX3 */
+  PERMIT_AUTH, /* SELECT_DATA */
+  PERMIT_AUTH, /* RELOAD_SOURCES */
 };
 
 /* ================================================== */
@@ -153,23 +157,22 @@ static void read_from_cmd_socket(int sock_fd, int event, void *anything);
 static int
 open_socket(int family)
 {
+  const char *local_path, *iface;
   IPSockAddr local_addr;
-  const char *local_path;
   int sock_fd, port;
 
   switch (family) {
     case IPADDR_INET4:
     case IPADDR_INET6:
       port = CNF_GetCommandPort();
-      if (port == 0 || !SCK_IsFamilySupported(family))
+      if (port == 0 || !SCK_IsIpFamilyEnabled(family))
         return INVALID_SOCK_FD;
 
       CNF_GetBindCommandAddress(family, &local_addr.ip_addr);
-      if (local_addr.ip_addr.family != family)
-        SCK_GetLoopbackIPAddress(family, &local_addr.ip_addr);
       local_addr.port = port;
+      iface = CNF_GetBindCommandInterface();
 
-      sock_fd = SCK_OpenUdpSocket(NULL, &local_addr, SCK_FLAG_RX_DEST_ADDR);
+      sock_fd = SCK_OpenUdpSocket(NULL, &local_addr, iface, SCK_FLAG_RX_DEST_ADDR);
       if (sock_fd < 0) {
         LOG(LOGS_ERR, "Could not open command socket on %s",
             UTI_IPSockAddrToString(&local_addr));
@@ -233,22 +236,17 @@ do_size_checks(void)
 /* ================================================== */
 
 void
-CAM_Initialise(int family)
+CAM_Initialise(void)
 {
   assert(!initialised);
   assert(sizeof (permissions) / sizeof (permissions[0]) == N_REQUEST_TYPES);
   do_size_checks();
 
   initialised = 1;
+
   sock_fdu = INVALID_SOCK_FD;
-  sock_fd4 = INVALID_SOCK_FD;
+  sock_fd4 = open_socket(IPADDR_INET4);
-  sock_fd6 = INVALID_SOCK_FD;
+  sock_fd6 = open_socket(IPADDR_INET6);
-
-  if (family == IPADDR_UNSPEC || family == IPADDR_INET4)
-    sock_fd4 = open_socket(IPADDR_INET4);
-
-  if (family == IPADDR_UNSPEC || family == IPADDR_INET6)
-    sock_fd6 = open_socket(IPADDR_INET6);
 
   access_auth_table = ADF_CreateTable();
 }
@@ -289,17 +287,28 @@ CAM_OpenUnixSocket(void)
 {
   /* This is separated from CAM_Initialise() as it needs to be called when
      the process has already dropped the root privileges */
-  if (CNF_GetBindCommandPath()[0])
+  if (CNF_GetBindCommandPath())
     sock_fdu = open_socket(IPADDR_UNSPEC);
 }
 
 /* ================================================== */
 
 static void
-transmit_reply(int sock_fd, SCK_Message *message)
+transmit_reply(int sock_fd, int request_length, SCK_Message *message)
 {
   message->length = PKL_ReplyLength((CMD_Reply *)message->data);
 
+  if (request_length < message->length) {
+    DEBUG_LOG("Response longer than request req_len=%d res_len=%d",
+              request_length, message->length);
+    return;
+  }
+
+  /* Don't require responses to non-link-local addresses to use the same
+     interface */
+  if (!SCK_IsLinkLocalIPAddress(&message->remote_addr.ip.ip_addr))
+    message->if_index = INVALID_IF_INDEX;
+
   if (!SCK_SendMessage(sock_fd, message, 0))
     return;
 }
@@ -569,11 +578,8 @@ handle_source_data(CMD_Request *rx_message, CMD_Reply *tx_message)
     tx_message->data.source_data.stratum = htons(report.stratum);
     tx_message->data.source_data.poll    = htons(report.poll);
     switch (report.state) {
-      case RPT_SYNC:
+      case RPT_NONSELECTABLE:
-        tx_message->data.source_data.state   = htons(RPY_SD_ST_SYNC);
+        tx_message->data.source_data.state   = htons(RPY_SD_ST_NONSELECTABLE);
-        break;
-      case RPT_UNREACH:
-        tx_message->data.source_data.state   = htons(RPY_SD_ST_UNREACH);
         break;
       case RPT_FALSETICKER:
         tx_message->data.source_data.state   = htons(RPY_SD_ST_FALSETICKER);
@@ -581,11 +587,14 @@ handle_source_data(CMD_Request *rx_message, CMD_Reply *tx_message)
       case RPT_JITTERY:
         tx_message->data.source_data.state   = htons(RPY_SD_ST_JITTERY);
         break;
-      case RPT_CANDIDATE:
+      case RPT_SELECTABLE:
-        tx_message->data.source_data.state   = htons(RPY_SD_ST_CANDIDATE);
+        tx_message->data.source_data.state   = htons(RPY_SD_ST_SELECTABLE);
         break;
-      case RPT_OUTLIER:
+      case RPT_UNSELECTED:
-        tx_message->data.source_data.state   = htons(RPY_SD_ST_OUTLIER);
+        tx_message->data.source_data.state   = htons(RPY_SD_ST_UNSELECTED);
+        break;
+      case RPT_SELECTED:
+        tx_message->data.source_data.state   = htons(RPY_SD_ST_SELECTED);
         break;
     }
     switch (report.mode) {
@@ -599,11 +608,7 @@ handle_source_data(CMD_Request *rx_message, CMD_Reply *tx_message)
         tx_message->data.source_data.mode    = htons(RPY_SD_MD_REF);
         break;
     }
-    tx_message->data.source_data.flags =
+    tx_message->data.source_data.flags = htons(0);
-                  htons((report.sel_options & SRC_SELECT_PREFER ? RPY_SD_FLAG_PREFER : 0) |
-                        (report.sel_options & SRC_SELECT_NOSELECT ? RPY_SD_FLAG_NOSELECT : 0) |
-                        (report.sel_options & SRC_SELECT_TRUST ? RPY_SD_FLAG_TRUST : 0) |
-                        (report.sel_options & SRC_SELECT_REQUIRE ? RPY_SD_FLAG_REQUIRE : 0));
     tx_message->data.source_data.reachability = htons(report.reachability);
     tx_message->data.source_data.since_sample = htonl(report.latest_meas_ago);
     tx_message->data.source_data.orig_latest_meas = UTI_FloatHostToNetwork(report.orig_latest_meas);
@@ -716,7 +721,7 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
       return;
   }
 
-  port = (unsigned short)(ntohl(rx_message->data.ntp_source.port));
+  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);
   params.presend_minpoll = ntohl(rx_message->data.ntp_source.presend_minpoll);
@@ -751,7 +756,7 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
 
-  status = NSR_AddSourceByName(name, port, pool, type, &params);
+  status = NSR_AddSourceByName(name, port, pool, type, &params, NULL);
   switch (status) {
     case NSR_Success:
       break;
@@ -780,13 +785,12 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
 static void
 handle_del_source(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
-  NTP_Remote_Address rem_addr;
   NSR_Status status;
+  IPAddr ip_addr;
   
-  UTI_IPNetworkToHost(&rx_message->data.del_source.ip_addr, &rem_addr.ip_addr);
+  UTI_IPNetworkToHost(&rx_message->data.del_source.ip_addr, &ip_addr);
-  rem_addr.port = 0;
   
-  status = NSR_RemoveSource(&rem_addr);
+  status = NSR_RemoveSource(&ip_addr);
   switch (status) {
     case NSR_Success:
       break;
@@ -1000,7 +1004,7 @@ handle_client_accesses_by_index(CMD_Request *rx_message, CMD_Reply *tx_message)
   RPT_ClientAccessByIndex_Report report;
   RPY_ClientAccesses_Client *client;
   int n_indices;
-  uint32_t i, j, req_first_index, req_n_clients;
+  uint32_t i, j, req_first_index, req_n_clients, req_min_hits, req_reset;
   struct timespec now;
 
   SCH_GetLastEventTime(&now, NULL, NULL);
@@ -1009,6 +1013,8 @@ handle_client_accesses_by_index(CMD_Request *rx_message, CMD_Reply *tx_message)
   req_n_clients = ntohl(rx_message->data.client_accesses_by_index.n_clients);
   if (req_n_clients > MAX_CLIENT_ACCESSES)
     req_n_clients = MAX_CLIENT_ACCESSES;
+  req_min_hits = ntohl(rx_message->data.client_accesses_by_index.min_hits);
+  req_reset = ntohl(rx_message->data.client_accesses_by_index.reset);
 
   n_indices = CLG_GetNumberOfIndices();
   if (n_indices < 0) {
@@ -1016,24 +1022,28 @@ handle_client_accesses_by_index(CMD_Request *rx_message, CMD_Reply *tx_message)
     return;
   }
 
-  tx_message->reply = htons(RPY_CLIENT_ACCESSES_BY_INDEX2);
+  tx_message->reply = htons(RPY_CLIENT_ACCESSES_BY_INDEX3);
   tx_message->data.client_accesses_by_index.n_indices = htonl(n_indices);
 
   for (i = req_first_index, j = 0; i < (uint32_t)n_indices && j < req_n_clients; i++) {
-    if (!CLG_GetClientAccessReportByIndex(i, &report, &now))
+    if (!CLG_GetClientAccessReportByIndex(i, req_reset, req_min_hits, &report, &now))
       continue;
 
     client = &tx_message->data.client_accesses_by_index.clients[j++];
 
     UTI_IPHostToNetwork(&report.ip_addr, &client->ip);
     client->ntp_hits = htonl(report.ntp_hits);
+    client->nke_hits = htonl(report.nke_hits);
     client->cmd_hits = htonl(report.cmd_hits);
     client->ntp_drops = htonl(report.ntp_drops);
+    client->nke_drops = htonl(report.nke_drops);
     client->cmd_drops = htonl(report.cmd_drops);
     client->ntp_interval = report.ntp_interval;
+    client->nke_interval = report.nke_interval;
     client->cmd_interval = report.cmd_interval;
     client->ntp_timeout_interval = report.ntp_timeout_interval;
     client->last_ntp_hit_ago = htonl(report.last_ntp_hit_ago);
+    client->last_nke_hit_ago = htonl(report.last_nke_hit_ago);
     client->last_cmd_hit_ago = htonl(report.last_cmd_hit_ago);
   }
 
@@ -1135,12 +1145,15 @@ handle_server_stats(CMD_Request *rx_message, CMD_Reply *tx_message)
   RPT_ServerStatsReport report;
 
   CLG_GetServerStatsReport(&report);
-  tx_message->reply = htons(RPY_SERVER_STATS);
+  tx_message->reply = htons(RPY_SERVER_STATS2);
   tx_message->data.server_stats.ntp_hits = htonl(report.ntp_hits);
+  tx_message->data.server_stats.nke_hits = htonl(report.nke_hits);
   tx_message->data.server_stats.cmd_hits = htonl(report.cmd_hits);
   tx_message->data.server_stats.ntp_drops = htonl(report.ntp_drops);
+  tx_message->data.server_stats.nke_drops = htonl(report.nke_drops);
   tx_message->data.server_stats.cmd_drops = htonl(report.cmd_drops);
   tx_message->data.server_stats.log_drops = htonl(report.log_drops);
+  tx_message->data.server_stats.ntp_auth_hits = htonl(report.ntp_auth_hits);
 }
 
 /* ================================================== */
@@ -1204,7 +1217,7 @@ handle_ntp_source_name(CMD_Request *rx_message, CMD_Reply *tx_message)
   IPAddr addr;
   char *name;
 
-  UTI_IPNetworkToHost(&rx_message->data.ntp_data.ip_addr, &addr);
+  UTI_IPNetworkToHost(&rx_message->data.ntp_source_name.ip_addr, &addr);
   name = NSR_GetName(&addr);
 
   if (!name) {
@@ -1226,7 +1239,15 @@ handle_ntp_source_name(CMD_Request *rx_message, CMD_Reply *tx_message)
 /* ================================================== */
 
 static void
-handle_reset(CMD_Request *rx_message, CMD_Reply *tx_message)
+handle_reload_sources(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  CNF_ReloadSources();
+}
+
+/* ================================================== */
+
+static void
+handle_reset_sources(CMD_Request *rx_message, CMD_Reply *tx_message)
 {
   struct timespec cooked_now, now;
 
@@ -1235,6 +1256,84 @@ handle_reset(CMD_Request *rx_message, CMD_Reply *tx_message)
   LCL_NotifyExternalTimeStep(&now, &cooked_now, 0.0, 0.0);
 }
 
+/* ================================================== */
+
+static void
+handle_auth_data(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  RPT_AuthReport report;
+  IPAddr ip_addr;
+
+  UTI_IPNetworkToHost(&rx_message->data.auth_data.ip_addr, &ip_addr);
+
+  if (!NSR_GetAuthReport(&ip_addr, &report)) {
+    tx_message->status = htons(STT_NOSUCHSOURCE);
+    return;
+  }
+
+  tx_message->reply = htons(RPY_AUTH_DATA);
+
+  switch (report.mode) {
+    case NTP_AUTH_NONE:
+      tx_message->data.auth_data.mode = htons(RPY_AD_MD_NONE);
+      break;
+    case NTP_AUTH_SYMMETRIC:
+      tx_message->data.auth_data.mode = htons(RPY_AD_MD_SYMMETRIC);
+      break;
+    case NTP_AUTH_NTS:
+      tx_message->data.auth_data.mode = htons(RPY_AD_MD_NTS);
+      break;
+    default:
+      break;
+  }
+
+  tx_message->data.auth_data.key_type = htons(report.key_type);
+  tx_message->data.auth_data.key_id = htonl(report.key_id);
+  tx_message->data.auth_data.key_length = htons(report.key_length);
+  tx_message->data.auth_data.ke_attempts = htons(report.ke_attempts);
+  tx_message->data.auth_data.last_ke_ago = htonl(report.last_ke_ago);
+  tx_message->data.auth_data.cookies = htons(report.cookies);
+  tx_message->data.auth_data.cookie_length = htons(report.cookie_length);
+  tx_message->data.auth_data.nak = htons(report.nak);
+}
+
+/* ================================================== */
+
+static uint16_t
+convert_select_options(int options)
+{
+  return (options & SRC_SELECT_PREFER ? RPY_SD_OPTION_PREFER : 0) |
+         (options & SRC_SELECT_NOSELECT ? RPY_SD_OPTION_NOSELECT : 0) |
+         (options & SRC_SELECT_TRUST ? RPY_SD_OPTION_TRUST : 0) |
+         (options & SRC_SELECT_REQUIRE ? RPY_SD_OPTION_REQUIRE : 0);
+}
+
+/* ================================================== */
+
+static void
+handle_select_data(CMD_Request *rx_message, CMD_Reply *tx_message)
+{
+  RPT_SelectReport report;
+
+  if (!SRC_GetSelectReport(ntohl(rx_message->data.select_data.index), &report)) {
+    tx_message->status = htons(STT_NOSUCHSOURCE);
+    return;
+  }
+
+  tx_message->reply = htons(RPY_SELECT_DATA);
+
+  tx_message->data.select_data.ref_id = htonl(report.ref_id);
+  UTI_IPHostToNetwork(&report.ip_addr, &tx_message->data.select_data.ip_addr);
+  tx_message->data.select_data.state_char = report.state_char;
+  tx_message->data.select_data.authentication = report.authentication;
+  tx_message->data.select_data.conf_options = htons(convert_select_options(report.conf_options));
+  tx_message->data.select_data.eff_options = htons(convert_select_options(report.eff_options));
+  tx_message->data.select_data.last_sample_ago = htonl(report.last_sample_ago);
+  tx_message->data.select_data.score = UTI_FloatHostToNetwork(report.score);
+  tx_message->data.select_data.hi_limit = UTI_FloatHostToNetwork(report.hi_limit);
+  tx_message->data.select_data.lo_limit = UTI_FloatHostToNetwork(report.lo_limit);
+}
+
 /* ================================================== */
 /* Read a packet and process it */
 
@@ -1247,7 +1346,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
   IPAddr loopback_addr, remote_ip;
   int read_length, expected_length;
   int localhost, allowed, log_index;
-  unsigned short rx_command;
+  uint16_t rx_command;
   struct timespec now, cooked_now;
 
   sck_message = SCK_ReceiveMessage(sock_fd, 0);
@@ -1305,11 +1404,11 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
     return;
   }
 
-  log_index = CLG_LogCommandAccess(&remote_ip, &cooked_now);
+  log_index = CLG_LogServiceAccess(CLG_CMDMON, &remote_ip, &cooked_now);
 
   /* Don't reply to all requests from hosts other than localhost if the rate
      is excessive */
-  if (!localhost && log_index >= 0 && CLG_LimitCommandResponseRate(log_index)) {
+  if (!localhost && log_index >= 0 && CLG_LimitServiceRate(CLG_CMDMON, log_index)) {
       DEBUG_LOG("Command packet discarded to limit response rate");
       return;
   }
@@ -1334,7 +1433,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
 
     if (rx_message.version >= PROTO_VERSION_MISMATCH_COMPAT_SERVER) {
       tx_message.status = htons(STT_BADPKTVERSION);
-      transmit_reply(sock_fd, sck_message);
+      transmit_reply(sock_fd, read_length, sck_message);
     }
     return;
   }
@@ -1344,7 +1443,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
     DEBUG_LOG("Command packet has invalid command %d", rx_command);
 
     tx_message.status = htons(STT_INVALID);
-    transmit_reply(sock_fd, sck_message);
+    transmit_reply(sock_fd, read_length, sck_message);
     return;
   }
 
@@ -1353,7 +1452,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
               expected_length);
 
     tx_message.status = htons(STT_BADPKTLENGTH);
-    transmit_reply(sock_fd, sck_message);
+    transmit_reply(sock_fd, read_length, sck_message);
     return;
   }
 
@@ -1553,7 +1652,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
           handle_cyclelogs(&rx_message, &tx_message);
           break;
 
-        case REQ_CLIENT_ACCESSES_BY_INDEX2:
+        case REQ_CLIENT_ACCESSES_BY_INDEX3:
           handle_client_accesses_by_index(&rx_message, &tx_message);
           break;
 
@@ -1613,8 +1712,20 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
           handle_ntp_source_name(&rx_message, &tx_message);
           break;
 
-        case REQ_RESET:
+        case REQ_RESET_SOURCES:
-          handle_reset(&rx_message, &tx_message);
+          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;
 
         default:
@@ -1628,19 +1739,7 @@ read_from_cmd_socket(int sock_fd, int event, void *anything)
   }
 
   /* Transmit the response */
-  {
+  transmit_reply(sock_fd, read_length, sck_message);
-    /* Include a simple way to lose one message in three to test resend */
-
-    static int do_it=1;
-
-    if (do_it) {
-      transmit_reply(sock_fd, sck_message);
-    }
-
-#if 0
-    do_it = ((do_it + 1) % 3);
-#endif
-  }
 }
 
 /* ================================================== */

cmdmon.h

@@ -29,7 +29,7 @@
 
 #include "addressing.h"
 
-extern void CAM_Initialise(int family);
+extern void CAM_Initialise(void);
 
 extern void CAM_Finalise(void);
 

cmdparse.c

@@ -151,7 +151,7 @@ CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
       if (sscanf(line, "%lf%n", &src->params.offset, &n) != 1)
         return 0;
     } else if (!strcasecmp(cmd, "port")) {
-      if (sscanf(line, "%hu%n", &src->port, &n) != 1)
+      if (sscanf(line, "%d%n", &src->port, &n) != 1)
         return 0;
     } else if (!strcasecmp(cmd, "polltarget")) {
       if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1)

cmdparse.h

@@ -32,7 +32,7 @@
 
 typedef struct {
   char *name;
-  unsigned short port;
+  int port;
   SourceParameters params;
 } CPS_NTP_Source;
 

conf.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2017
+ * Copyright (C) Miroslav Lichvar  2009-2017, 2020
  * 
  * 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
@@ -33,8 +33,10 @@
 #include "conf.h"
 #include "ntp_sources.h"
 #include "ntp_core.h"
+#include "nts_ke.h"
 #include "refclock.h"
 #include "cmdmon.h"
+#include "socket.h"
 #include "srcparams.h"
 #include "logging.h"
 #include "nameserv.h"
@@ -42,6 +44,12 @@
 #include "cmdparse.h"
 #include "util.h"
 
+/* ================================================== */
+
+#define MAX_LINE_LENGTH 2048
+#define MAX_CONF_DIRS 10
+#define MAX_INCLUDE_LEVEL 10
+
 /* ================================================== */
 /* Forward prototypes */
 
@@ -51,11 +59,13 @@ static int parse_double(char *line, double *result);
 static int parse_null(char *line);
 
 static void parse_allow_deny(char *line, ARR_Instance restrictions, int allow);
+static void parse_authselectmode(char *);
 static void parse_bindacqaddress(char *);
 static void parse_bindaddress(char *);
 static void parse_bindcmdaddress(char *);
 static void parse_broadcast(char *);
 static void parse_clientloglimit(char *);
+static void parse_confdir(char *);
 static void parse_fallbackdrift(char *);
 static void parse_hwtimestamp(char *);
 static void parse_include(char *);
@@ -70,12 +80,14 @@ static void parse_ratelimit(char *line, int *enabled, int *interval,
                             int *burst, int *leak);
 static void parse_refclock(char *);
 static void parse_smoothtime(char *);
-static void parse_source(char *line, NTP_Source_Type type, int pool);
+static void parse_source(char *line, char *type, int fatal);
+static void parse_sourcedir(char *);
 static void parse_tempcomp(char *);
 
 /* ================================================== */
 /* Configuration variables */
 
+static int print_config = 0;
 static int restarted = 0;
 static char *rtc_device;
 static int acquisition_port = -1;
@@ -88,7 +100,9 @@ static double correction_time_ratio = 3.0;
 static double max_clock_error = 1.0; /* in ppm */
 static double max_drift = 500000.0; /* in ppm */
 static double max_slew_rate = 1e6 / 12.0; /* in ppm */
+static double clock_precision = 0.0; /* in seconds */
 
+static SRC_AuthSelectMode authselect_mode = SRC_AUTHSELECT_MIX;
 static double max_distance = 3.0;
 static double max_jitter = 1.0;
 static double reselect_distance = 1e-4;
@@ -105,8 +119,8 @@ static int do_log_rtc = 0;
 static int do_log_refclocks = 0;
 static int do_log_tempcomp = 0;
 static int log_banner = 32;
-static char *logdir;
+static char *logdir = NULL;
-static char *dumpdir;
+static char *dumpdir = NULL;
 
 static int enable_local=0;
 static int local_stratum;
@@ -180,21 +194,33 @@ static IPAddr bind_acq_address4, bind_acq_address6;
    the loopback address will be used */
 static IPAddr bind_cmd_address4, bind_cmd_address6;
 
+/* Interface names to bind the NTP server, NTP client, and command socket */
+static char *bind_ntp_iface = NULL;
+static char *bind_acq_iface = NULL;
+static char *bind_cmd_iface = NULL;
+
 /* Path to the Unix domain command socket. */
-static char *bind_cmd_path;
+static char *bind_cmd_path = NULL;
+
+/* Differentiated Services Code Point (DSCP) in transmitted NTP packets */
+static int ntp_dscp = 0;
 
 /* Path to Samba (ntp_signd) socket. */
 static char *ntp_signd_socket = NULL;
 
 /* Filename to use for storing pid of running chronyd, to prevent multiple
  * chronyds being started. */
-static char *pidfile;
+static char *pidfile = NULL;
 
 /* Rate limiting parameters */
 static int ntp_ratelimit_enabled = 0;
 static int ntp_ratelimit_interval = 3;
 static int ntp_ratelimit_burst = 8;
 static int ntp_ratelimit_leak = 2;
+static int nts_ratelimit_enabled = 0;
+static int nts_ratelimit_interval = 6;
+static int nts_ratelimit_burst = 8;
+static int nts_ratelimit_leak = 2;
 static int cmd_ratelimit_enabled = 0;
 static int cmd_ratelimit_interval = -4;
 static int cmd_ratelimit_burst = 8;
@@ -228,7 +254,7 @@ static char *nts_dump_dir = NULL;
 static char *nts_ntp_server = NULL;
 static char *nts_server_cert_file = NULL;
 static char *nts_server_key_file = NULL;
-static int nts_server_port = 11443;
+static int nts_server_port = NKE_PORT;
 static int nts_server_processes = 1;
 static int nts_server_connections = 100;
 static int nts_refresh = 2419200; /* 4 weeks */
@@ -252,6 +278,10 @@ typedef struct {
 
 /* 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;
 
 /* Array of RefclockParameters */
 static ARR_Instance refclock_sources;
@@ -268,8 +298,7 @@ static ARR_Instance ntp_restrictions;
 static ARR_Instance cmd_restrictions;
 
 typedef struct {
-  IPAddr addr;
+  NTP_Remote_Address addr;
-  unsigned short port;
   int interval;
 } NTP_Broadcast_Destination;
 
@@ -283,6 +312,8 @@ static int line_number;
 static const char *processed_file;
 static const char *processed_command;
 
+static int include_level = 0;
+
 /* ================================================== */
 
 static void
@@ -349,26 +380,31 @@ 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));
 
-  dumpdir = Strdup("");
-  logdir = Strdup("");
   rtc_device = Strdup(DEFAULT_RTC_DEVICE);
   hwclock_file = Strdup(DEFAULT_HWCLOCK_FILE);
   user = Strdup(DEFAULT_USER);
 
   if (client_only) {
     cmd_port = ntp_port = 0;
-    bind_cmd_path = Strdup("");
-    pidfile = Strdup("");
   } else {
     bind_cmd_path = Strdup(DEFAULT_COMMAND_SOCKET);
     pidfile = Strdup(DEFAULT_PID_FILE);
   }
+
+  SCK_GetAnyLocalIPAddress(IPADDR_INET4, &bind_address4);
+  SCK_GetAnyLocalIPAddress(IPADDR_INET6, &bind_address6);
+  SCK_GetAnyLocalIPAddress(IPADDR_INET4, &bind_acq_address4);
+  SCK_GetAnyLocalIPAddress(IPADDR_INET6, &bind_acq_address6);
+  SCK_GetLoopbackIPAddress(IPADDR_INET4, &bind_cmd_address4);
+  SCK_GetLoopbackIPAddress(IPADDR_INET6, &bind_cmd_address6);
 }
 
 /* ================================================== */
@@ -384,9 +420,13 @@ CNF_Finalise(void)
 
   for (i = 0; i < ARR_GetSize(ntp_sources); i++)
     Free(((NTP_Source *)ARR_GetElement(ntp_sources, i))->params.name);
+  for (i = 0; i < ARR_GetSize(ntp_source_dirs); i++)
+    Free(*(char **)ARR_GetElement(ntp_source_dirs, i));
 
   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);
 
@@ -399,6 +439,9 @@ CNF_Finalise(void)
   Free(keys_file);
   Free(leapsec_tz);
   Free(logdir);
+  Free(bind_ntp_iface);
+  Free(bind_acq_iface);
+  Free(bind_cmd_iface);
   Free(bind_cmd_path);
   Free(ntp_signd_socket);
   Free(pidfile);
@@ -417,14 +460,26 @@ CNF_Finalise(void)
 
 /* ================================================== */
 
+void
+CNF_EnablePrint(void)
+{
+  print_config = 1;
+}
+
+/* ================================================== */
+
 /* Read the configuration file */
 void
 CNF_ReadFile(const char *filename)
 {
   FILE *in;
-  char line[2048];
+  char line[MAX_LINE_LENGTH + 1];
   int i;
 
+  include_level++;
+  if (include_level > MAX_INCLUDE_LEVEL)
+    LOG_FATAL("Maximum include level reached");
+
   in = UTI_OpenFile(NULL, filename, NULL, 'R', 0);
 
   for (i = 1; fgets(line, sizeof(line), in); i++) {
@@ -432,6 +487,8 @@ CNF_ReadFile(const char *filename)
   }
 
   fclose(in);
+
+  include_level--;
 }
 
 /* ================================================== */
@@ -446,31 +503,50 @@ CNF_ParseLine(const char *filename, int number, char *line)
   processed_file = filename;
   line_number = number;
 
+  /* Detect truncated line */
+  if (strlen(line) >= MAX_LINE_LENGTH)
+    other_parse_error("String too long");
+
   /* Remove extra white-space and comments */
   CPS_NormalizeLine(line);
 
   /* Skip blank lines */
-  if (!*line)
+  if (!*line) {
+    processed_file = NULL;
     return;
+  }
 
   /* We have a real line, now try to match commands */
   processed_command = command = line;
   p = CPS_SplitWord(line);
 
+  if (print_config && strcasecmp(command, "include") && strcasecmp(command, "confdir"))
+    printf("%s%s%s\n", command, p[0] != '\0' ? " " : "", p);
+
   if (!strcasecmp(command, "acquisitionport")) {
     parse_int(p, &acquisition_port);
   } else if (!strcasecmp(command, "allow")) {
     parse_allow_deny(p, ntp_restrictions, 1);
+  } else if (!strcasecmp(command, "authselectmode")) {
+    parse_authselectmode(p);
   } else if (!strcasecmp(command, "bindacqaddress")) {
     parse_bindacqaddress(p);
+  } else if (!strcasecmp(command, "bindacqdevice")) {
+    parse_string(p, &bind_acq_iface);
   } else if (!strcasecmp(command, "bindaddress")) {
     parse_bindaddress(p);
   } else if (!strcasecmp(command, "bindcmdaddress")) {
     parse_bindcmdaddress(p);
+  } else if (!strcasecmp(command, "bindcmddevice")) {
+    parse_string(p, &bind_cmd_iface);
+  } else if (!strcasecmp(command, "binddevice")) {
+    parse_string(p, &bind_ntp_iface);
   } else if (!strcasecmp(command, "broadcast")) {
     parse_broadcast(p);
   } else if (!strcasecmp(command, "clientloglimit")) {
     parse_clientloglimit(p);
+  } else if (!strcasecmp(command, "clockprecision")) {
+    parse_double(p, &clock_precision);
   } else if (!strcasecmp(command, "cmdallow")) {
     parse_allow_deny(p, cmd_restrictions, 1);
   } else if (!strcasecmp(command, "cmddeny")) {
@@ -482,12 +558,16 @@ CNF_ParseLine(const char *filename, int number, char *line)
                     &cmd_ratelimit_burst, &cmd_ratelimit_leak);
   } else if (!strcasecmp(command, "combinelimit")) {
     parse_double(p, &combine_limit);
+  } else if (!strcasecmp(command, "confdir")) {
+    parse_confdir(p);
   } else if (!strcasecmp(command, "corrtimeratio")) {
     parse_double(p, &correction_time_ratio);
   } else if (!strcasecmp(command, "deny")) {
     parse_allow_deny(p, ntp_restrictions, 0);
   } else if (!strcasecmp(command, "driftfile")) {
     parse_string(p, &drift_file);
+  } else if (!strcasecmp(command, "dscp")) {
+    parse_int(p, &ntp_dscp);
   } else if (!strcasecmp(command, "dumpdir")) {
     parse_string(p, &dumpdir);
   } else if (!strcasecmp(command, "dumponexit")) {
@@ -556,6 +636,9 @@ CNF_ParseLine(const char *filename, int number, char *line)
     no_system_cert = parse_null(p);
   } else if (!strcasecmp(command, "ntpsigndsocket")) {
     parse_string(p, &ntp_signd_socket);
+  } else if (!strcasecmp(command, "ntsratelimit")) {
+    parse_ratelimit(p, &nts_ratelimit_enabled, &nts_ratelimit_interval,
+                    &nts_ratelimit_burst, &nts_ratelimit_leak);
   } else if (!strcasecmp(command, "ntstrustedcerts")) {
     parse_string(p, &nts_trusted_cert_file);
   } else if (!strcasecmp(command, "ntscachedir") ||
@@ -576,11 +659,11 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "ntsserverkey")) {
     parse_string(p, &nts_server_key_file);
   } else if (!strcasecmp(command, "peer")) {
-    parse_source(p, NTP_PEER, 0);
+    parse_source(p, command, 1);
   } else if (!strcasecmp(command, "pidfile")) {
     parse_string(p, &pidfile);
   } else if (!strcasecmp(command, "pool")) {
-    parse_source(p, NTP_SERVER, 1);
+    parse_source(p, command, 1);
   } else if (!strcasecmp(command, "port")) {
     parse_int(p, &ntp_port);
   } else if (!strcasecmp(command, "ratelimit")) {
@@ -603,9 +686,11 @@ CNF_ParseLine(const char *filename, int number, char *line)
   } else if (!strcasecmp(command, "sched_priority")) {
     parse_int(p, &sched_priority);
   } else if (!strcasecmp(command, "server")) {
-    parse_source(p, NTP_SERVER, 0);
+    parse_source(p, command, 1);
   } else if (!strcasecmp(command, "smoothtime")) {
     parse_smoothtime(p);
+  } else if (!strcasecmp(command, "sourcedir")) {
+    parse_sourcedir(p);
   } else if (!strcasecmp(command, "stratumweight")) {
     parse_double(p, &stratum_weight);
   } else if (!strcasecmp(command, "tempcomp")) {
@@ -618,8 +703,10 @@ 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 command");
+    other_parse_error("Invalid directive");
   }
+
+  processed_file = processed_command = NULL;
 }
 
 /* ================================================== */
@@ -671,15 +758,31 @@ parse_null(char *line)
 /* ================================================== */
 
 static void
-parse_source(char *line, NTP_Source_Type type, int pool)
+parse_source(char *line, char *type, int fatal)
 {
   NTP_Source source;
 
-  source.type = type;
+  if (strcasecmp(type, "peer") == 0) {
-  source.pool = pool;
+    source.type = NTP_PEER;
+    source.pool = 0;
+  } else if (strcasecmp(type, "pool") == 0) {
+    source.type = NTP_SERVER;
+    source.pool = 1;
+  } else if (strcasecmp(type, "server") == 0) {
+    source.type = NTP_SERVER;
+    source.pool = 0;
+  } else {
+    if (fatal)
+      command_parse_error();
+    return;
+  }
+
+  /* Avoid comparing uninitialized data in compare_sources() */
+  memset(&source.params, 0, sizeof (source.params));
 
   if (!CPS_ParseNTPSourceAdd(line, &source.params)) {
-    command_parse_error();
+    if (fatal)
+      command_parse_error();
     return;
   }
 
@@ -689,6 +792,17 @@ parse_source(char *line, NTP_Source_Type type, int pool)
 
 /* ================================================== */
 
+static void
+parse_sourcedir(char *line)
+{
+  char *s;
+
+  s = Strdup(line);
+  ARR_AppendElement(ntp_source_dirs, &s);
+}
+
+/* ================================================== */
+
 static void
 parse_ratelimit(char *line, int *enabled, int *interval, int *burst, int *leak)
 {
@@ -1141,6 +1255,23 @@ parse_allow_deny(char *line, ARR_Instance restrictions, int allow)
   
 /* ================================================== */
 
+static void
+parse_authselectmode(char *line)
+{
+  if (!strcasecmp(line, "require"))
+    authselect_mode = SRC_AUTHSELECT_REQUIRE;
+  else if (!strcasecmp(line, "prefer"))
+    authselect_mode = SRC_AUTHSELECT_PREFER;
+  else if (!strcasecmp(line, "mix"))
+    authselect_mode = SRC_AUTHSELECT_MIX;
+  else if (!strcasecmp(line, "ignore"))
+    authselect_mode = SRC_AUTHSELECT_IGNORE;
+  else
+    command_parse_error();
+}
+
+/* ================================================== */
+
 static void
 parse_bindacqaddress(char *line)
 {
@@ -1188,8 +1319,10 @@ parse_bindcmdaddress(char *line)
   if (line[0] == '/') {
     parse_string(line, &bind_cmd_path);
     /* / disables the socket */
-    if (!strcmp(bind_cmd_path, "/"))
+    if (strcmp(bind_cmd_path, "/") == 0) {
-        bind_cmd_path[0] = '\0';
+      Free(bind_cmd_path);
+      bind_cmd_path = NULL;
+    }
   } else if (UTI_StringToIP(line, &ip)) {
     if (ip.family == IPADDR_INET4)
       bind_cmd_address4 = ip;
@@ -1242,8 +1375,8 @@ parse_broadcast(char *line)
   }
 
   destination = (NTP_Broadcast_Destination *)ARR_GetNewElement(broadcasts);
-  destination->addr = ip;
+  destination->addr.ip_addr = ip;
-  destination->port = port;
+  destination->addr.port = port;
   destination->interval = interval;
 }
 
@@ -1386,6 +1519,86 @@ parse_hwtimestamp(char *line)
 
 /* ================================================== */
 
+static const char *
+get_basename(const char *path)
+{
+  const char *b = strrchr(path, '/');
+  return b ? b + 1 : path;
+}
+
+/* ================================================== */
+
+static int
+compare_basenames(const void *a, const void *b)
+{
+  return strcmp(get_basename(*(const char * const *)a),
+                get_basename(*(const char * const *)b));
+}
+
+/* ================================================== */
+
+static int
+search_dirs(char *line, const char *suffix, void (*file_handler)(const char *path))
+{
+  char *dirs[MAX_CONF_DIRS], buf[MAX_LINE_LENGTH], *path;
+  size_t i, j, k, locations, n_dirs;
+  glob_t gl;
+
+  n_dirs = UTI_SplitString(line, dirs, MAX_CONF_DIRS);
+  if (n_dirs < 1 || n_dirs > MAX_CONF_DIRS)
+    return 0;
+
+  /* Get the paths of all config files in the specified directories */
+  for (i = 0; i < n_dirs; i++) {
+    if (snprintf(buf, sizeof (buf), "%s/*%s", dirs[i], suffix) >= sizeof (buf))
+      assert(0);
+    if (glob(buf, GLOB_NOSORT | (i > 0 ? GLOB_APPEND : 0), NULL, &gl) != 0)
+      ;
+  }
+
+  if (gl.gl_pathc > 0) {
+    /* Sort the paths by filenames */
+    qsort(gl.gl_pathv, gl.gl_pathc, sizeof (gl.gl_pathv[0]), compare_basenames);
+
+    for (i = 0; i < gl.gl_pathc; i += locations) {
+      /* Count directories containing files with this name */
+      for (j = i + 1, locations = 1; j < gl.gl_pathc; j++, locations++) {
+        if (compare_basenames(&gl.gl_pathv[i], &gl.gl_pathv[j]) != 0)
+          break;
+      }
+
+      /* Read the first file of this name in the order of the directive */
+      for (j = 0; j < n_dirs; j++) {
+        for (k = 0; k < locations; k++) {
+          path = gl.gl_pathv[i + k];
+          if (strncmp(path, dirs[j], strlen(dirs[j])) == 0 &&
+              strlen(dirs[j]) + 1 + strlen(get_basename(path)) == strlen(path)) {
+            file_handler(path);
+            break;
+          }
+        }
+        if (k < locations)
+          break;
+      }
+    }
+  }
+
+  globfree(&gl);
+
+  return 1;
+}
+
+/* ================================================== */
+
+static void
+parse_confdir(char *line)
+{
+  if (!search_dirs(line, ".conf", CNF_ReadFile))
+    command_parse_error();
+}
+
+/* ================================================== */
+
 static void
 parse_include(char *line)
 {
@@ -1415,13 +1628,144 @@ parse_include(char *line)
 
 /* ================================================== */
 
+static void
+load_source_file(const char *filename)
+{
+  char line[MAX_LINE_LENGTH + 1];
+  FILE *f;
+
+  f = UTI_OpenFile(NULL, filename, NULL, 'r', 0);
+  if (!f)
+    return;
+
+  while (fgets(line, sizeof (line), f)) {
+    if (strlen(line) >= MAX_LINE_LENGTH)
+      continue;
+
+    CPS_NormalizeLine(line);
+    if (line[0] == '\0')
+      continue;
+
+    parse_source(CPS_SplitWord(line), line, 0);
+  }
+
+  fclose(f);
+}
+
+/* ================================================== */
+
+static int
+compare_sources(const void *a, const void *b)
+{
+  const NTP_Source *sa = a, *sb = b;
+  int d;
+
+  if (!sa->params.name)
+    return -1;
+  if (!sb->params.name)
+    return 1;
+  if ((d = strcmp(sa->params.name, sb->params.name)) != 0)
+    return d;
+  if ((d = (int)(sa->type) - (int)(sb->type)) != 0)
+    return d;
+  if ((d = sa->pool - sb->pool) != 0)
+    return d;
+  if ((d = sa->params.port - sb->params.port) != 0)
+    return d;
+  return memcmp(&sa->params.params, &sb->params.params, sizeof (sa->params.params));
+}
+
+/* ================================================== */
+
+static void
+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;
+
+  prev_size = ARR_GetSize(ntp_source_ids);
+  if (prev_size > 0 && ARR_GetSize(ntp_sources) != prev_size)
+    assert(0);
+
+  /* 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_sources = MallocArray(NTP_Source, prev_size);
+  memcpy(prev_sources, ARR_GetElements(ntp_sources), prev_size * sizeof (prev_sources[0]));
+
+  /* Load the sources again */
+  ARR_SetSize(ntp_sources, 0);
+  for (i = 0; i < ARR_GetSize(ntp_source_dirs); i++) {
+    if (snprintf(buf, sizeof (buf), "%s",
+                 *(char **)ARR_GetElement(ntp_source_dirs, i)) >= sizeof (buf))
+      assert(0);
+    search_dirs(buf, ".sources", load_source_file);
+  }
+
+  /* Add new and remove existing sources according to the new configuration.
+     Avoid removing and adding the same source again to keep its state. */
+
+  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;
+
+  qsort(new_sources, new_size, sizeof (new_sources[0]), compare_sources);
+
+  for (i = j = 0; i < prev_size || j < new_size; ) {
+    if (i < prev_size && j < new_size)
+      d = compare_sources(&prev_sources[i], &new_sources[j]);
+    else
+      d = i < prev_size ? -1 : 1;
+
+    if (d < 0) {
+      /* Remove the missing source */
+      if (prev_sources[i].params.name[0] != '\0')
+        NSR_RemoveSourcesById(prev_ids[i]);
+      i++;
+    } else if (d > 0) {
+      /* Add a newly configured source */
+      source = &new_sources[j];
+      s = NSR_AddSourceByName(source->params.name, source->params.port, source->pool,
+                              source->type, &source->params.params, &new_ids[j]);
+
+      if (s == NSR_UnresolvedName) {
+        unresolved++;
+      } else if (s != NSR_Success) {
+        /* Mark the source as not present */
+        source->params.name[0] = '\0';
+      }
+      j++;
+    } else {
+      /* Keep the existing source */
+      new_ids[j] = prev_ids[i];
+      i++, j++;
+    }
+  }
+
+  for (i = 0; i < prev_size; i++)
+    Free(prev_sources[i].params.name);
+  Free(prev_sources);
+  Free(prev_ids);
+
+  if (unresolved > 0)
+    NSR_ResolveSources();
+}
+
+/* ================================================== */
+
 void
 CNF_CreateDirs(uid_t uid, gid_t gid)
 {
   char *dir;
 
   /* Create a directory for the Unix domain command socket */
-  if (bind_cmd_path[0]) {
+  if (bind_cmd_path) {
     dir = UTI_PathToDir(bind_cmd_path);
     UTI_CreateDirAndParents(dir, 0770, uid, gid);
 
@@ -1430,16 +1774,19 @@ CNF_CreateDirs(uid_t uid, gid_t gid)
        domain sockets are ignored on some systems (e.g. Solaris). */
     if (!UTI_CheckDirPermissions(dir, 0770, uid, gid)) {
       LOG(LOGS_WARN, "Disabled command socket %s", bind_cmd_path);
-      bind_cmd_path[0] = '\0';
+      Free(bind_cmd_path);
+      bind_cmd_path = NULL;
     }
 
     Free(dir);
   }
 
-  if (logdir[0])
+  if (logdir)
-    UTI_CreateDirAndParents(logdir, 0755, uid, gid);
+    UTI_CreateDirAndParents(logdir, 0750, uid, gid);
-  if (dumpdir[0])
+  if (dumpdir)
-    UTI_CreateDirAndParents(dumpdir, 0755, uid, gid);
+    UTI_CreateDirAndParents(dumpdir, 0750, uid, gid);
+  if (nts_dump_dir)
+    UTI_CreateDirAndParents(nts_dump_dir, 0750, uid, gid);
 }
 
 /* ================================================== */
@@ -1456,13 +1803,12 @@ CNF_AddInitSources(void)
     /* Get the default NTP params */
     CPS_ParseNTPSourceAdd(dummy_hostname, &cps_source);
 
-    /* Add the address as an offline iburst server */
+    /* Add the address as a server specified with the iburst option */
     ntp_addr.ip_addr = *(IPAddr *)ARR_GetElement(init_sources, i);
     ntp_addr.port = cps_source.port;
     cps_source.params.iburst = 1;
-    cps_source.params.connectivity = SRC_OFFLINE;
 
-    NSR_AddSource(&ntp_addr, NTP_SERVER, &cps_source.params);
+    NSR_AddSource(&ntp_addr, NTP_SERVER, &cps_source.params, NULL);
   }
 
   ARR_SetSize(init_sources, 0);
@@ -1479,11 +1825,13 @@ CNF_AddSources(void)
   for (i = 0; i < ARR_GetSize(ntp_sources); i++) {
     source = (NTP_Source *)ARR_GetElement(ntp_sources, i);
     NSR_AddSourceByName(source->params.name, source->params.port,
-                        source->pool, source->type, &source->params.params);
+                        source->pool, source->type, &source->params.params, NULL);
     Free(source->params.name);
   }
 
   ARR_SetSize(ntp_sources, 0);
+
+  reload_source_dirs();
 }
 
 /* ================================================== */
@@ -1510,8 +1858,7 @@ CNF_AddBroadcasts(void)
 
   for (i = 0; i < ARR_GetSize(broadcasts); i++) {
     destination = (NTP_Broadcast_Destination *)ARR_GetElement(broadcasts, i);
-    NCR_AddBroadcastDestination(&destination->addr, destination->port,
+    NCR_AddBroadcastDestination(&destination->addr, destination->interval);
-                                destination->interval);
   }
 
   ARR_SetSize(broadcasts, 0);
@@ -1519,6 +1866,14 @@ CNF_AddBroadcasts(void)
 
 /* ================================================== */
 
+void
+CNF_ReloadSources(void)
+{
+  reload_source_dirs();
+}
+
+/* ================================================== */
+
 int
 CNF_GetNTPPort(void)
 {
@@ -1680,6 +2035,14 @@ CNF_GetCorrectionTimeRatio(void)
 
 /* ================================================== */
 
+SRC_AuthSelectMode
+CNF_GetAuthSelectMode(void)
+{
+  return authselect_mode;
+}
+
+/* ================================================== */
+
 double
 CNF_GetMaxSlewRate(void)
 {
@@ -1688,6 +2051,14 @@ CNF_GetMaxSlewRate(void)
 
 /* ================================================== */
 
+double
+CNF_GetClockPrecision(void)
+{
+  return clock_precision;
+}
+
+/* ================================================== */
+
 double
 CNF_GetMaxDistance(void)
 {
@@ -1897,6 +2268,30 @@ CNF_GetBindAcquisitionAddress(int family, IPAddr *addr)
 
 /* ================================================== */
 
+char *
+CNF_GetBindNtpInterface(void)
+{
+  return bind_ntp_iface;
+}
+
+/* ================================================== */
+
+char *
+CNF_GetBindAcquisitionInterface(void)
+{
+  return bind_acq_iface;
+}
+
+/* ================================================== */
+
+char *
+CNF_GetBindCommandInterface(void)
+{
+  return bind_cmd_iface;
+}
+
+/* ================================================== */
+
 char *
 CNF_GetBindCommandPath(void)
 {
@@ -1918,6 +2313,14 @@ CNF_GetBindCommandAddress(int family, IPAddr *addr)
 
 /* ================================================== */
 
+int
+CNF_GetNtpDscp(void)
+{
+  return ntp_dscp;
+}
+
+/* ================================================== */
+
 char *
 CNF_GetNtpSigndSocket(void)
 {
@@ -1976,6 +2379,16 @@ int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak)
 
 /* ================================================== */
 
+int CNF_GetNtsRateLimit(int *interval, int *burst, int *leak)
+{
+  *interval = nts_ratelimit_interval;
+  *burst = nts_ratelimit_burst;
+  *leak = nts_ratelimit_leak;
+  return nts_ratelimit_enabled;
+}
+
+/* ================================================== */
+
 int CNF_GetCommandRateLimit(int *interval, int *burst, int *leak)
 {
   *interval = cmd_ratelimit_interval;

conf.h

@@ -30,10 +30,13 @@
 
 #include "addressing.h"
 #include "reference.h"
+#include "sources.h"
 
 extern void CNF_Initialise(int restarted, int client_only);
 extern void CNF_Finalise(void);
 
+extern void CNF_EnablePrint(void);
+
 extern char *CNF_GetRtcDevice(void);
 
 extern void CNF_ReadFile(const char *filename);
@@ -46,6 +49,8 @@ extern void CNF_AddSources(void);
 extern void CNF_AddBroadcasts(void);
 extern void CNF_AddRefclocks(void);
 
+extern void CNF_ReloadSources(void);
+
 extern int CNF_GetAcquisitionPort(void);
 extern int CNF_GetNTPPort(void);
 extern char *CNF_GetDriftFile(void);
@@ -74,7 +79,11 @@ extern void CNF_GetFallbackDrifts(int *min, int *max);
 extern void CNF_GetBindAddress(int family, IPAddr *addr);
 extern void CNF_GetBindAcquisitionAddress(int family, IPAddr *addr);
 extern void CNF_GetBindCommandAddress(int family, IPAddr *addr);
+extern char *CNF_GetBindNtpInterface(void);
+extern char *CNF_GetBindAcquisitionInterface(void);
+extern char *CNF_GetBindCommandInterface(void);
 extern char *CNF_GetBindCommandPath(void);
+extern int CNF_GetNtpDscp(void);
 extern char *CNF_GetNtpSigndSocket(void);
 extern char *CNF_GetPidFile(void);
 extern REF_LeapMode CNF_GetLeapSecMode(void);
@@ -86,7 +95,9 @@ extern double CNF_GetMaxClockError(void);
 extern double CNF_GetMaxDrift(void);
 extern double CNF_GetCorrectionTimeRatio(void);
 extern double CNF_GetMaxSlewRate(void);
+extern double CNF_GetClockPrecision(void);
 
+extern SRC_AuthSelectMode CNF_GetAuthSelectMode(void);
 extern double CNF_GetMaxDistance(void);
 extern double CNF_GetMaxJitter(void);
 extern double CNF_GetReselectDistance(void);
@@ -101,6 +112,7 @@ extern int CNF_GetSchedPriority(void);
 extern int CNF_GetLockMemory(void);
 
 extern int CNF_GetNTPRateLimit(int *interval, int *burst, int *leak);
+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);
 extern void CNF_GetTempComp(char **file, double *interval, char **point_file, double *T0, double *k0, double *k1, double *k2);

configure

@@ -5,7 +5,7 @@
 #
 # Copyright (C) Richard P. Curnow  1997-2003
 # Copyright (C) Bryan Christianson  2016
-# Copyright (C) Miroslav Lichvar  2009, 2012-2018
+# Copyright (C) Miroslav Lichvar  2009, 2012-2020
 # Copyright (C) Stefan R. Filipek  2019
 #
 # =======================================================================
@@ -108,11 +108,7 @@ for instance \`--prefix=$HOME'.
 
 For better control, use the options below.
   --disable-readline     Disable line editing support
-  --without-readline     Don't use GNU readline even if it is available
   --without-editline     Don't use editline even if it is available
-  --with-readline-includes=DIR Specify where readline include directory is
-  --with-readline-library=DIR Specify where readline lib directory is
-  --with-ncurses-library=DIR Specify where ncurses lib directory is
   --disable-sechash      Disable support for hashes other than MD5
   --without-nettle       Don't use nettle even if it is available
   --without-nss          Don't use NSS even if it is available
@@ -225,7 +221,6 @@ feat_cmdmon=1
 feat_ntp=1
 feat_refclock=1
 feat_readline=1
-try_readline=1
 try_editline=1
 feat_sechash=1
 try_nettle=1
@@ -241,9 +236,6 @@ try_clockctl=0
 feat_scfilter=0
 try_seccomp=-1
 priv_ops=""
-readline_lib=""
-readline_inc=""
-ncurses_lib=""
 feat_ipv6=1
 feat_phc=1
 try_phc=0
@@ -274,21 +266,9 @@ do
     --disable-readline )
       feat_readline=0
     ;;
-    --without-readline )
-      try_readline=0
-    ;;
     --without-editline )
       try_editline=0
     ;;
-    --with-readline-library=* )
-      readline_lib=-L`echo $option | sed -e 's/^.*=//;'`
-    ;;
-    --with-readline-includes=* )
-      readline_inc=-I`echo $option | sed -e 's/^.*=//;'`
-    ;;
-    --with-ncurses-library=* )
-      ncurses_lib=-L`echo $option | sed -e 's/^.*=//;'`
-    ;;
     --prefix=* | --install_prefix=* )
       SETPREFIX=`echo $option | sed -e 's/[^=]*=//;'`
     ;;
@@ -657,6 +637,7 @@ if [ $feat_ipv6 = "1" ] && \
     struct sockaddr_in6 n;
     char p[100];
     n.sin6_addr = in6addr_any;
+    n.sin6_scope_id = 0;
     return !inet_ntop(AF_INET6, &n.sin6_addr.s6_addr, p, sizeof(p));'
 then
   add_def FEAT_IPV6
@@ -803,10 +784,12 @@ if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
     'seccomp_init(SCMP_ACT_KILL);'
 then
   add_def FEAT_SCFILTER
-  # NAME2IPADDRESS shouldn't be enabled with other operations as the helper
+  if [ $feat_ntp = "1" ]; then
-  # process works on one request at the time and the async resolver could
+    # NAME2IPADDRESS shouldn't be enabled together with a privops operation
-  # block the main thread
+    # used by the main thread as the helper process works on one request at
-  priv_ops="NAME2IPADDRESS RELOADDNS"
+    # a time and the async resolver would block the main thread
+    priv_ops="NAME2IPADDRESS RELOADDNS"
+  fi
   EXTRA_LIBS="$EXTRA_LIBS -lseccomp"
 fi
 
@@ -875,37 +858,11 @@ fi
 READLINE_LINK=""
 if [ $feat_readline = "1" ]; then
   if [ $try_editline = "1" ]; then
-    if test_code editline 'stdio.h editline/readline.h' \
+    if test_code editline 'stdio.h editline/readline.h' '' '-ledit' \
-      "$readline_inc" "$readline_lib -ledit" \
       'add_history(readline("prompt"));'
     then
       add_def FEAT_READLINE
-      add_def USE_EDITLINE
+      READLINE_LINK="-ledit"
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
-      READLINE_LINK="$readline_lib -ledit"
-    fi
-  fi
-
-  if [ "x$READLINE_LINK" = "x" ] && [ $try_readline = "1" ]; then
-    if test_code readline 'stdio.h readline/readline.h readline/history.h' \
-      "$readline_inc" "$readline_lib -lreadline" \
-      'add_history(readline("prompt"));'
-    then
-      add_def FEAT_READLINE
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
-      READLINE_LINK="$readline_lib -lreadline"
-    fi
-  fi
-
-  if [ "x$READLINE_LINK" = "x" ] && [ $try_readline = "1" ]; then
-    if test_code 'readline with -lncurses' \
-      'stdio.h readline/readline.h readline/history.h' \
-      "$readline_inc" "$readline_lib $ncurses_lib -lreadline -lncurses" \
-      'add_history(readline("prompt"));'
-    then
-      add_def FEAT_READLINE
-      MYCPPFLAGS="$MYCPPFLAGS $readline_inc"
-      READLINE_LINK="$readline_lib $ncurses_lib -lreadline -lncurses"
     fi
   fi
 
@@ -939,7 +896,7 @@ fi
 
 if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nss = "1" ]; then
   test_cflags="`pkg_config --cflags nss`"
-  test_link="`pkg_config --libs-only-L nss` -lfreebl3"
+  test_link="`pkg_config --libs-only-L nss` -lfreebl3 -lnssutil3"
   if test_code 'NSS' 'nss.h hasht.h nsslowhash.h' \
     "$test_cflags" "$test_link" \
     'NSSLOWHASH_Begin(NSSLOWHASH_NewContext(NSSLOW_Init(), HASH_AlgSHA512));'
@@ -966,31 +923,45 @@ EXTRA_OBJECTS="$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" ] && \
+if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
-    echo "$HASH_LINK" | grep 'nettle' > /dev/null; then
   test_cflags="`pkg_config --cflags gnutls`"
   test_link="`pkg_config --libs gnutls`"
   if test_code 'gnutls' 'gnutls/gnutls.h' \
     "$test_cflags" "$test_link" '
-      return gnutls_init(NULL, 0) +
+      return gnutls_init(NULL, 0) + GNUTLS_TLS1_3 +
         gnutls_priority_init2(NULL, "", NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND) +
-        gnutls_prf_rfc5705(NULL, 0, "", 0, "", 16, NULL);' &&
+        gnutls_prf_rfc5705(NULL, 0, "", 0, "", 16, NULL);'
-    test_code 'AES128 in nettle' 'nettle/aes.h' '' "$LIBS" \
-      'aes128_set_encrypt_key(NULL, NULL);'
   then
-    EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ke_client.o nts_ke_server.o nts_ke_session.o"
-    EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ntp_auth.o nts_ntp_client.o nts_ntp_server.o"
-    EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
-    LIBS="$LIBS $test_link"
-    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
-    add_def FEAT_NTS
-
-    add_def HAVE_SIV
     if test_code 'SIV in nettle' \
       'nettle/siv-cmac.h' "" "$LIBS" \
       'siv_cmac_aes128_set_key(NULL, NULL);'
     then
+      EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
+      add_def HAVE_SIV
       add_def HAVE_NETTLE_SIV_CMAC
+    else
+      if test_code 'SIV in gnutls' 'gnutls/gnutls.h' \
+        "$test_cflags" "$test_link" '
+          return gnutls_aead_cipher_init(NULL, GNUTLS_CIPHER_AES_128_SIV, NULL);'
+      then
+        EXTRA_OBJECTS="$EXTRA_OBJECTS siv_gnutls.o"
+        add_def HAVE_SIV
+      else
+        if test_code 'AES128 in nettle' 'nettle/aes.h' '' "$LIBS" \
+          'aes128_set_encrypt_key(NULL, NULL);'
+        then
+          EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
+          add_def HAVE_SIV
+        fi
+      fi
+    fi
+
+    if grep '#define HAVE_SIV' config.h > /dev/null; then
+      EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ke_client.o nts_ke_server.o nts_ke_session.o"
+      EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ntp_auth.o nts_ntp_client.o nts_ntp_server.o"
+      LIBS="$LIBS $test_link"
+      MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
+      add_def FEAT_NTS
     fi
   fi
 fi

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  2009-2017
+// Copyright (C) Miroslav Lichvar  2009-2020
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
@@ -32,12 +32,14 @@ chrony.conf - chronyd configuration file
 == DESCRIPTION
 
 This file configures the *chronyd* daemon. The compiled-in location is
-_@SYSCONFDIR@/chrony.conf_, but other locations can be specified on the
+_@SYSCONFDIR@/chrony.conf_. Other locations can be specified on the
 *chronyd* command line with the *-f* option.
 
 Each directive in the configuration file is placed on a separate line. The
-following sections describe each of the directives in turn. The directives can
+following sections describe each of the directives in turn. The directives are
-occur in any order in the file and they are not case-sensitive.
+not case-sensitive. Generally, the directives can occur in any order in the file
+and if a directive is specified multiple times, only the last one will be
+effective. Exceptions are noted in the descriptions.
 
 The configuration directives can also be specified directly on the *chronyd*
 command line. In this case each argument is parsed as a new line and the
@@ -61,9 +63,10 @@ source. The client-server relationship is strictly hierarchical: a client might
 synchronise its system time to that of the server, but the server's system time
 will never be influenced by that of a client.
 +
-The *server* directive is immediately followed by either the name of the
+This directive can be used multiple times to specify multiple servers.
-server, or its IP address. The *server* directive supports the following
++
-options:
+The directive is immediately followed by either the name of the
+server, or its IP address. It supports the following options:
 +
 *minpoll* _poll_:::
 This option specifies the minimum interval between requests sent to the server
@@ -82,13 +85,13 @@ interval should stay at or below 9 (512 seconds). The default is 10 (1024
 seconds), the minimum is -6 (1/64th of a second), and the maximum is 24 (6
 months).
 *iburst*:::
-With this option, the interval between the first four requests sent to the
+With this option, *chronyd* will start with a burst of 4-8 requests in order to
-server will be 2 seconds or less instead of the interval specified by the
+make the first update of the clock sooner. It will also repeat the burst every
-*minpoll* option, which allows *chronyd* to make the first update of the clock
+time the source is switched from the offline state to online with the
-shortly after start.
+<<chronyc.adoc#online,*online*>> command in *chronyc*.
 *burst*:::
-With this option, *chronyd* will shorten the interval between up to four
+With this option, *chronyd* will send a burst of up to 4 requests when it
-requests to 2 seconds or less when it cannot get a good measurement from the
+cannot get a good measurement from the
 server. The number of requests in the burst is limited by the current polling
 interval to keep the average interval at or above the minimum interval, i.e.
 the current interval needs to be at least two times longer than the minimum
@@ -200,10 +203,11 @@ authenticated source to be safely combined with unauthenticated sources in
 order to improve the accuracy of the clock. They can be selected and used for
 synchronisation only if they agree with the trusted and required source.
 *xleave*:::
-This option enables an interleaved mode which enables the server to
+This option enables the interleaved mode of NTP. It enables the server to
-send transmit timestamps captured after the actual transmission (e.g. when the
+respond with more accurate transmit timestamps (e.g. kernel or hardware
-server is running *chronyd* with software (kernel) or hardware
+timestamps), which cannot be contained in the transmitted packet itself and
-timestamping). This can significantly improve the accuracy of the measurements.
+need to refer to a previous packet instead. This can significantly improve the
+accuracy and stability of the measurements.
 +
 The interleaved mode is compatible with servers that support only the basic
 mode. Note that even
@@ -228,7 +232,7 @@ be specified. For normal servers this option should not be required (the
 default is 123, the standard NTP port).
 *ntsport* _port_:::
 This option specifies the TCP port on which the server is listening for NTS-KE
-connections when the *nts* option is enabled. The default is 11443.
+connections when the *nts* option is enabled. The default is 4460.
 *presend* _poll_:::
 If the timing measurements being made by *chronyd* are the only network data
 passing between two computers, you might find that some measurements are badly
@@ -275,6 +279,8 @@ directive, except that it is used to specify a pool of NTP servers rather than
 a single NTP server. The pool name is expected to resolve to multiple addresses
 which might change over time.
 +
+This directive can be used multiple times to specify multiple pools.
++
 All options valid in the <<server,*server*>> directive can be used in this
 directive too. There is one option specific to the *pool* directive:
 +
@@ -284,7 +290,7 @@ This option sets the desired number of sources to be used from the pool.
 sources responding to requests. The default value is 4 and the maximum value is
 16.
 +
-::
+{blank}::
 When an NTP source is unreachable,
 marked as a falseticker, or has a distance larger than the limit set by the
 <<maxdistance,*maxdistance*>> directive, *chronyd* will try to replace the
@@ -305,6 +311,8 @@ is mainly useful when the NTP implementation of the peer (e.g. *ntpd*) supports
 ephemeral symmetric associations and does not need to be configured with an
 address of this host. *chronyd* does not support ephemeral associations.
 +
+This directive can be used multiple times to specify multiple peers.
++
 The following options of the *server* directive do not work in the *peer*
 directive: *iburst*, *burst*, *nts*, *presend*.
 +
@@ -397,6 +405,8 @@ driver-specific parameter. The two parameters are followed by zero or more
 refclock options. Some drivers have special options, which can be appended to
 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*:
 +
 *PPS*:::
@@ -412,7 +422,7 @@ By default, the PPS refclock uses assert events (rising edge) for
 synchronisation. With this option, it will use clear events (falling edge)
 instead.
 +
-:::
+{blank}:::
 Examples:
 +
 ----
@@ -431,7 +441,7 @@ supports the following option:
 This option specifies the permissions of the shared memory segment created by
 *chronyd*. They are specified as a numeric mode. The default value is 0600
 (read-write access for owner only).
-:::
+{blank}:::
 +
 Examples:
 +
@@ -485,7 +495,7 @@ value is 0.
 This option enables timestamping of clear events (falling edge) instead of
 assert events (rising edge) in the PPS mode. This may not work with some
 clocks.
-:::
+{blank}:::
 +
 Examples:
 +
@@ -495,7 +505,7 @@ refclock PHC /dev/ptp1:nocrossts poll 3 pps
 refclock PHC /dev/ptp2:extpps:pin=1 width 0.2 poll 2
 ----
 +
-::
+{blank}::
 The *refclock* directive supports the following options:
 +
 *poll* _poll_:::
@@ -609,12 +619,13 @@ behaviour, whereas the *settime* command allows samples of manually entered
 time to be provided.)
 
 [[acquisitionport]]*acquisitionport* _port_::
-By default, *chronyd* uses a separate client socket for each configured server
+By default, *chronyd* as an NTP client opens a new socket for each request with
-and their source port is chosen arbitrarily by the operating system. However,
+the source port chosen randomly by the operating system. The *acquisitionport*
-you can use the *acquisitionport* directive to explicitly specify a port and
+directive can be used to specify the source port and use only one socket (per
-use only one socket (per IPv4 or IPv6 address family) for all configured servers.
+IPv4 or IPv6 address family) for all configured servers. This can be useful for
-This can be useful for getting through some firewalls. If set to 0, the source
+getting through some firewalls. It should not be used if not necessary as there
-port of the socket will be chosen arbitrarily.
+is a small impact on security of the client. If set to 0, the source port of
+the permanent socket will be chosen randomly by the operating system.
 +
 It can be set to the same port as is used by the NTP server (which can be
 configured with the <<port,*port*>> directive) to use only one socket for all
@@ -630,14 +641,40 @@ This would change the source port used for client requests to UDP port 1123.
 You could then persuade the firewall administrator to open that port.
 
 [[bindacqaddress]]*bindacqaddress* _address_::
-The *bindacqaddress* directive sets the network interface to which
+The *bindacqaddress* directive specifies a local IP address to which
-*chronyd* will bind its NTP client sockets. The syntax is similar to the
+*chronyd* will bind its NTP and NTS-KE client sockets. The syntax is similar to
-<<bindaddress,*bindaddress*>> and <<bindcmdaddress,*bindcmdaddress*>>
+the <<bindaddress,*bindaddress*>> and <<bindcmdaddress,*bindcmdaddress*>>
 directives.
 +
 For each of the IPv4 and IPv6 protocols, only one *bindacqaddress* directive
 can be specified.
 
+[[bindacqdevice]]*bindacqdevice* _interface_::
+The *bindacqdevice* directive binds the client sockets to a network device
+specified by the interface name. This can be useful when the local address is
+dynamic, or to enable an NTP source specified with a link-local IPv6 address.
+This directive can specify only one interface and it is supported on Linux
+only.
++
+An example of the directive is:
++
+----
+bindacqdevice eth0
+----
+
+[[dscp]]*dscp* _point_::
+The *dscp* directive sets the Differentiated Services Code Point (DSCP) in
+transmitted NTP packets to the specified value. It can improve stability of NTP
+measurements in local networks where switches or routers are configured to
+prioritise forwarding of packets with specific DSCP values. The default value
+is 0 and the maximum value is 63.
++
+An example of the directive (setting the Expedited Forwarding class) is:
++
+----
+dscp 46
+----
+
 [[dumpdir]]*dumpdir* _directory_::
 To compute the rate of gain or loss of time, *chronyd* has to store a
 measurement history for each of the time sources it uses.
@@ -655,6 +692,8 @@ behaviour whilst it is not running). The *dumpdir* directive defines the
 directory where the measurement histories are saved when *chronyd* exits,
 or the <<chronyc.adoc#dump,*dump*>> command in *chronyc* is issued.
 +
+If the directory does not exist, it will be created automatically.
++
 An example of the directive is:
 +
 ----
@@ -696,6 +735,8 @@ received from the server in order to avoid making an NTS-KE request when
 source in files named by the IP address of the NTS-KE server (e.g.
 _1.2.3.4.nts_). By default, the client does not save the cookies.
 +
+If the directory does not exist, it will be created automatically.
++
 An example of the directive is:
 +
 ----
@@ -726,7 +767,7 @@ authentication mechanism to be used on computers which start with wrong time
 has important security implications, e.g. if an NTP server was ever
 compromised, its certificate could be used in an attack after the expiration
 time. The default value is 0, which means the time checks are always enabled.
-
++
 An example of the directive is:
 +
 ----
@@ -739,6 +780,78 @@ with correct time.
 
 === Source selection
 
+[[authselectmode]]*authselectmode* _mode_::
+NTP sources can be specified with the *key* or *nts* option to enable
+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
+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
+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
+authenticated sources and might have a positive impact on the accuracy of the
+clock. Note that in this case the impact of the attack is higher. The attackers
+cannot cause an arbitrarily large step or slew, but they have more control over
+the frequency of the clock and can cause *chronyd* to report false information,
+e.g. a significantly smaller root delay and dispersion.
++
+This directive determines the default selection options for authenticated and
+unauthenticated sources in order to simplify the configuration with the
+configuration file and *chronyc* commands. It sets a policy for authentication.
++
+Sources specified with the *noselect* option are ignored (not counted as either
+authenticated or unauthenticated), and they always have only the selection
+options specified in the configuration.
++
+There are four modes:
++
+*require*:::
+Authentication is strictly required for NTP sources in this mode. If any
+unauthenticated NTP sources are specified, they will automatically get the
+*noselect* option to prevent them from being selected for synchronisation.
+*prefer*:::
+In this mode, authentication is optional and preferred. If it is enabled for at
+least one NTP source, all unauthenticated NTP sources will get the *noselect*
+option.
+*mix*:::
+In this mode, authentication is optional and synchronisation to a mix of
+authenticated and unauthenticated NTP sources is allowed. If both authenticated
+and unauthenticated NTP sources are specified, all authenticated NTP sources
+and reference clocks will get the *require* and *trust* options to prevent
+synchronisation to unauthenticated NTP sources if they do not agree with a
+majority of the authenticated sources and reference clocks. This is the default
+mode.
+*ignore*:::
+In this mode, authentication is ignored in the source selection. All sources
+will have only the selection options that were specified in the configuration
+file, or *chronyc* command. This was the behaviour of *chronyd* in versions
+before 4.0.
+{blank}::
++
+As an example, the following configuration using the default *mix* mode:
++
+----
+server foo.example.net nts
+server bar.example.net nts
+server baz.example.net
+refclock SHM 0
+----
++
+is equivalent to the following configuration using the *ignore* mode:
++
+----
+authselectmode ignore
+server foo.example.net nts require trust
+server bar.example.net nts require trust
+server baz.example.net
+refclock SHM 0 require trust
+----
+
 [[combinelimit]]*combinelimit* _limit_::
 When *chronyd* has multiple sources available for synchronisation, it has to
 select one source as the synchronisation source. The measured offsets and
@@ -805,6 +918,27 @@ distances are in milliseconds.
 
 === System clock
 
+[[clockprecision]]*clockprecision* _precision_::
+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
+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
+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'
+NTP measurements. The server's precision is reported on clients by the
+<<chronyc.adoc#ntpdata,*ntpdata*>> command.
++
+An example setting the precision to 8 nanoseconds is:
++
+----
+clockprecision 8e-9
+----
+
 [[corrtimeratio]]*corrtimeratio* _ratio_::
 When *chronyd* is slewing the system clock to correct an offset, the rate at
 which it is slewing adds to the frequency error of the clock. On all supported
@@ -913,7 +1047,7 @@ clock will be off for a longer time. On Linux with the default
 No correction is applied to the clock for the leap second. The clock will be
 corrected later in normal operation when new measurements are made and the
 estimated offset includes the one second error.
-::
+{blank}::
 +
 When serving time to NTP clients that cannot be configured to correct their
 clocks for a leap second by slewing, or to clients that would correct at
@@ -936,7 +1070,7 @@ A recommended configuration to enable a server leap smear is:
 ----
 leapsecmode slew
 maxslewrate 1000
-smoothtime 400 0.001 leaponly
+smoothtime 400 0.001024 leaponly
 ----
 +
 The first directive is necessary to disable the clock step which would reset
@@ -944,11 +1078,17 @@ the smoothing process. The second directive limits the slewing rate of the
 local clock to 1000 ppm, which improves the stability of the smoothing process
 when the local correction starts and ends. The third directive enables the
 server time smoothing process. It will start when the clock gets to 00:00:00
-UTC and it will take 17 hours 34 minutes to finish. The frequency offset will
+UTC and it will take 62500 seconds (about 17.36 hours) to finish. The frequency
-be changing by 0.001 ppm per second and will reach a maximum of 31.623 ppm. The
+offset will be changing by 0.001024 ppm per second and will reach a maximum of
-*leaponly* option makes the duration of the leap smear constant and allows the
+32 ppm in 31250 seconds. The *leaponly* option makes the duration of the leap
-clients to safely synchronise with multiple identically configured leap
+smear constant and allows the clients to safely synchronise with multiple
-smearing servers.
+identically configured leap smearing servers.
++
+The duration of the leap smear can be calculated from the specified wander as
++
+----
+duration = sqrt(4 / wander)
+----
 
 [[leapsectz]]*leapsectz* _timezone_::
 This directive specifies a timezone in the system tz database which *chronyd*
@@ -1118,7 +1258,7 @@ coefficients _T0_, _k0_, _k1_, _k2_.
 The frequency compensation is calculated (in ppm) as
 +
 ----
-k0 + (T - T0) * k1 + (T - T0)^2 * k2
+comp = k0 + (T - T0) * k1 + (T - T0)^2 * k2
 ----
 +
 The result has to be between -10 ppm and 10 ppm, otherwise the measurement is
@@ -1169,12 +1309,15 @@ _tempcomp.log_ file if enabled by the <<log,*log tempcomp*>> directive.
 
 [[allow]]*allow* [*all*] [_subnet_]::
 The *allow* directive is used to designate a particular subnet from which NTP
-clients are allowed to access the computer as an NTP server.
+clients are allowed to access the computer as an NTP server. It also controls
+access of NTS-KE clients when NTS is enabled on the server.
 +
 The default is that no clients are allowed access, i.e. *chronyd* operates
 purely as an NTP client. If the *allow* directive is used, *chronyd* will be
 both a client of its servers, and a server to other clients.
 +
+This directive can be used multiple times.
++
 Examples of the use of the directive are as follows:
 +
 ----
@@ -1241,18 +1384,19 @@ client access by this computer for it to work.
 
 [[deny]]*deny* [*all*] [_subnet_]::
 This is similar to the <<allow,*allow*>> directive, except that it denies NTP
-client access to a particular subnet or host, rather than allowing it.
+and NTS-KE client access to a particular subnet or host, rather than allowing
+it.
 +
-The syntax is identical.
+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.
 
 [[bindaddress]]*bindaddress* _address_::
-The *bindaddress* directive binds the socket on which *chronyd* listens for NTP
+The *bindaddress* directive binds the sockets on which *chronyd* listens for
-requests to a local address of the computer. On systems other than Linux, the
+NTP and NTS-KE requests to a local address of the computer. On systems other
-address of the computer needs to be already configured when *chronyd* is
+than Linux, the address of the computer needs to be already configured when
-started.
+*chronyd* is started.
 +
 An example of the use of the directive is:
 +
@@ -1264,12 +1408,25 @@ Currently, for each of the IPv4 and IPv6 protocols, only one *bindaddress*
 directive can be specified. Therefore, it is not useful on computers which
 should serve NTP on multiple network interfaces.
 
+[[binddevice]]*binddevice* _interface_::
+The *binddevice* directive binds the NTP and NTS-KE server sockets to a network
+device specified by the interface name. This directive can specify only one
+interface and it is supported on Linux only.
++
+An example of the directive is:
++
+----
+binddevice eth0
+----
+
 [[broadcast]]*broadcast* _interval_ _address_ [_port_]::
 The *broadcast* directive is used to declare a broadcast address to which
 chronyd should send packets in the NTP broadcast mode (i.e. make *chronyd* act
 as a broadcast server). Broadcast clients on that subnet will be able to
 synchronise.
 +
+This directive can be used multiple times to specify multiple addresses.
++
 The syntax is as follows:
 +
 ----
@@ -1369,16 +1526,18 @@ 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
-synchronised to it. When that server fails, another will take over.
+synchronised to it. If that server stops responding, the server with the second
+smallest reference ID will take over when its local reference mode activates
+(root distance reaches the threshold configured by the *distance* option).
 +
 The *orphan* mode is compatible with the *ntpd*'s orphan mode (enabled by the
 *tos orphan* command).
-::
+{blank}::
 +
 An example of the directive is:
 +
 ----
-local stratum 10 orphan
+local stratum 10 orphan distance 0.1
 ----
 
 [[ntpsigndsocket]]*ntpsigndsocket* _directory_::
@@ -1400,7 +1559,7 @@ ntpsigndsocket /var/lib/samba/ntp_signd
 
 [[ntsport]]*ntsport* _port_::
 This directive specifies the TCP port on which *chronyd* will provide the NTS
-Key Establishment (NTS-KE) service. The default port is 11443.
+Key Establishment (NTS-KE) service. The default port is 4460.
 +
 The port will be open only when a certificate and key is specified by the
 *ntsservercert* and *ntsserverkey* directives.
@@ -1516,7 +1675,7 @@ 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
 maximum value is 4.
-::
+{blank}::
 +
 An example use of the directive is:
 +
@@ -1528,6 +1687,17 @@ This would reduce the response rate for IP addresses sending packets on average
 more than once per 2 seconds, or sending packets in bursts of more than 16
 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).
++
+An example of the use of the directive is:
++
+----
+ntsratelimit interval 3 burst 1
+----
+
 [[smoothtime]]*smoothtime* _max-freq_ _max-wander_ [*leaponly*]::
 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
@@ -1581,8 +1751,8 @@ smoothtime 50000 0.01
 === Command and monitoring access
 
 [[bindcmdaddress]]*bindcmdaddress* _address_::
-The *bindcmdaddress* directive allows you to specify an IP address of an
+The *bindcmdaddress* directive specifies a local IP address to which *chronyd*
-interface on which *chronyd* will listen for monitoring command packets (issued
+will bind the UDP socket listening for monitoring command packets (issued
 by *chronyc*). On systems other than Linux, the address of the interface needs
 to be already configured when *chronyd* is started.
 +
@@ -1593,9 +1763,10 @@ directory will be created on start if it does not exist. The compiled-in default
 path of the socket is _@CHRONYRUNDIR@/chronyd.sock_. The socket can be
 disabled by setting the path to _/_.
 +
-By default, *chronyd* binds to the loopback interface (with addresses
+By default, *chronyd* binds the UDP sockets to the addresses _127.0.0.1_ and
-_127.0.0.1_ and _::1_). This blocks all access except from localhost. To listen
+_::1_ (i.e. the loopback interface). This blocks all access except from
-for command packets on all interfaces, you can add the lines:
+localhost. To listen for command packets on all interfaces, you can add the
+lines:
 +
 ----
 bindcmdaddress 0.0.0.0
@@ -1613,6 +1784,17 @@ An example that sets the path of the Unix domain command socket is:
 bindcmdaddress /var/run/chrony/chronyd.sock
 ----
 
+[[bindcmddevice]]*bindcmddevice* _interface_::
+The *bindcmddevice* directive binds the UDP command sockets to a network device
+specified by the interface name. This directive can specify only one interface
+and it is supported on Linux only.
++
+An example of the directive is:
++
+----
+bindcmddevice eth0
+----
+
 [[cmdallow]]*cmdallow* [*all*] [_subnet_]::
 This is similar to the <<allow,*allow*>> directive, except that it allows
 monitoring access (rather than NTP client access) to a particular subnet or
@@ -1685,7 +1867,8 @@ The *rtcautotrim* directive is used to keep the RTC close to the system clock
 automatically. When the system clock is synchronised and the estimated error
 between the two clocks is larger than the specified threshold, *chronyd* will
 trim the RTC as if the <<chronyc.adoc#trimrtc,*trimrtc*>> command in *chronyc*
-was issued.
+was issued. The trimming operation is accurate to only about 1 second, which is
+the minimum effective threshold.
 +
 This directive is effective only with the <<rtcfile,*rtcfile*>> directive.
 +
@@ -1991,7 +2174,7 @@ from the example line above):
 . Applied compensation in ppm, positive means the system clock is running
   faster than it would be without the compensation. [3.6600e-01]
 +
-::
+{blank}::
 An example of the directive is:
 +
 ----
@@ -2024,8 +2207,9 @@ which would cause a syslog message to be generated if a system clock error of ov
 0.1 seconds starts to be compensated.
 
 [[logdir]]*logdir* _directory_::
-This directive allows the directory where log files are written to be
+This directive specifies the directory for writing log files enabled by the
-specified.
+*log* directive. If the directory does not exist, it will be created
+automatically.
 +
 An example of the use of this directive is:
 +
@@ -2053,6 +2237,56 @@ sendmail binary.
 
 === Miscellaneous
 
+[[confdir]]*confdir* _directory_...::
+The *confdir* directive includes configuration files with the _.conf_ suffix
+from a directory. The files are included in the lexicographical order of the
+file names.
++
+Multiple directories (up to 10) can be specified with a single *confdir*
+directive. In this case, if multiple directories contain a file with the same
+name, only the first file in the order of the specified directories will be
+included. This enables a fragmented configuration where existing fragments can
+be replaced by adding files to a different directory.
++
+This directive can be used multiple times.
++
+An example of the directive is:
++
+----
+confdir @SYSCONFDIR@/chrony.d
+----
+
+[[sourcedir]]*sourcedir* _directory_...::
+The *sourcedir* directive is identical to the *confdir* directive, except the
+configuration files have the _.sources_ suffix, they can only specify NTP
+sources (i.e. use the *server*, *pool*, and *peer* directive), and can be
+reloaded by the <<chronyc.adoc#reload,*reload sources*>> command in
+*chronyc*. It is particularly useful with dynamic sources like NTP servers
+received from a DHCP server, which can be written to a file specific to the
+network interface by a networking script.
++
+This directive can be used multiple times.
++
+An example of the directive is:
++
+----
+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
+required to exist.
++
+This directive can be used multiple times.
++
+An example of the directive is:
++
+----
+include @SYSCONFDIR@/chrony.d/*.conf
+----
+
 [[hwtimestamp]]*hwtimestamp* _interface_ [_option_]...::
 This directive enables hardware timestamping of NTP packets sent to and
 received from the specified network interface. The network interface controller
@@ -2082,8 +2316,9 @@ indicated in the _measurements.log_ file if enabled by the <<log,*log
 measurements*>> directive, and the <<chronyc.adoc#ntpdata,*ntpdata*>> report in
 *chronyc*.
 +
-If the specified interface is _*_, *chronyd* will try to enable HW timestamping
+This directive can be used multiple times to enable HW timestamping on multiple
-on all available interfaces.
+interfaces. If the specified interface is _*_, *chronyd* will try to enable HW
+timestamping on all available interfaces.
 +
 The *hwtimestamp* directive has the following options:
 +
@@ -2123,14 +2358,14 @@ _ntp_::::
 Enables timestamping of received NTP packets.
 _none_::::
 Disables timestamping of received packets.
-:::
+{blank}:::
 The most specific filter for timestamping NTP packets which is supported by the
 NIC is selected by default. Some NICs can timestamp only PTP packets, which
 limits the selection to the _none_ filter. Forcing timestamping of all packets
 with the _all_ filter when the NIC supports both _all_ and _ntp_ filters can be
 useful when packets are received from or on a non-standard UDP port (e.g.
 specified by the *port* directive).
-::
+{blank}::
 +
 Examples of the directive are:
 +
@@ -2140,17 +2375,6 @@ hwtimestamp eth1 txcomp 300e-9 rxcomp 645e-9
 hwtimestamp *
 ----
 
-[[include]]*include* _pattern_::
-The *include* directive includes a configuration file or multiple configuration
-files if a wildcard pattern is specified. This can be useful when maintaining
-configuration on multiple hosts to keep the differences in separate files.
-+
-An example of the directive is:
-+
-----
-include @SYSCONFDIR@/chrony.d/*.conf
-----
-
 [[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
@@ -2326,6 +2550,20 @@ makestep 1.0 3
 rtcsync
 ----
 
+If the servers (or pool) support the Network Time Security (NTS)
+authentication mechanism and *chronyd* is compiled with NTS support, the *nts*
+option will enable a secure synchronisation to the servers. The configuration
+file could look like:
+
+----
+server foo.example.net iburst nts
+server bar.example.net iburst nts
+server baz.example.net iburst nts
+driftfile @CHRONYVARDIR@/drift
+makestep 1.0 3
+rtcsync
+----
+
 === NTP client with infrequent connection to NTP servers
 
 This section shows how to configure *chronyd* for computers that have

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
+// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2020
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
@@ -39,7 +39,7 @@ running.
 If no commands are specified on the command line, *chronyc* will expect input
 from the user. The prompt _chronyc>_ will be displayed when it is being run
 from a terminal. If *chronyc*'s input or output are redirected from or to a file,
-the prompt is not shown.
+the prompt will not be shown.
 
 There are two ways *chronyc* can access *chronyd*. One is the Internet
 Protocol (IPv4 or IPv6) and the other is a Unix domain socket, which is
@@ -60,9 +60,7 @@ 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
 over the network, *chronyd* will respond with a '`Not authorised`' error, even
-if it is from localhost. In chrony versions before 2.2 they were allowed
+if it is from localhost.
-from the network if they were authenticated with a password, but that is no
-longer supported.
 
 Having full access to *chronyd* via *chronyc* is more or less equivalent to
 being able to modify the *chronyd*'s configuration file and restart it.
@@ -183,10 +181,12 @@ speeding up or slowing down the system clock until the error has been removed,
 and then returning to the system clock's normal speed. A consequence of this is
 that there will be a period when the system clock (as read by other programs)
 will be different from *chronyd*'s estimate of the current true time (which it
-reports to NTP clients when it is operating in server mode). The value reported
+reports to NTP clients when it is operating as a server). The value reported
 on this line is the difference due to this effect.
 *Last offset*:::
-This is the estimated local offset on the last clock update.
+This is the estimated local offset on the last clock update. A positive value
+indicates the local time (as previously estimated true time) was ahead of the
+time sources.
 *RMS offset*:::
 This is a long-term average of the offset value.
 *Frequency*:::
@@ -317,18 +317,23 @@ The columns are as follows:
 This indicates the mode of the source. _^_ means a server, _=_ means a peer
 and _#_ indicates a locally connected reference clock.
 *S*:::
-This column indicates the state of the source.
+This column indicates the selection state of the source.
-* _*_ indicates the source to which *chronyd* is currently synchronised.
+* _*_ indicates the best source which is currently selected for
-* _+_ indicates acceptable sources which are combined with the selected
+  synchronisation.
-  source.
+* _+_ indicates other sources selected for synchronisation, which are combined
-* _-_ indicates acceptable sources which are excluded by the combining
+  with the best source.
-  algorithm.
+* _-_ indicates a source which is considered to be selectable for
-* _?_ indicates sources to which connectivity has been lost or whose packets
+  synchronisation, but not currently selected.
-  do not pass all tests. It is also shown at start-up, until at least 3 samples
+* _x_ indicates a source which *chronyd* thinks is a falseticker (i.e. its
-  have been gathered from it.
+  time is inconsistent with a majority of other sources, or sources specified
-* _x_ indicates a clock which *chronyd* thinks is a falseticker (i.e. its
+  with the *trust* option).
-  time is inconsistent with a majority of other sources).
 * _~_ indicates a source whose time appears to have too much variability.
+* _?_ indicates a source which is not considered to be selectable for
+  synchronisation for other reasons (e.g. unreachable, not synchronised, or
+  does not have enough measurements).
+{blank}:::
+The <<selectdata,*selectdata*>> command can be used to get more details about
+the selection state.
 *Name/IP address*:::
 This shows the name or the IP address of the source, or reference ID for reference
 clocks.
@@ -414,6 +419,92 @@ This is the estimated offset of the source.
 *Std Dev*:::
 This is the estimated sample standard deviation.
 
+[[selectdata]]*selectdata* [*-a*] [*-v*]::
+The *selectdata* command displays information specific to the selection of time
+sources. If the *-a* option is specified, all sources are displayed, including
+those that do not have a known address yet. With the *-v* option, extra caption
+lines are shown as a reminder of the meanings of the columns.
++
+An example of the output is shown below.
++
+----
+S Name/IP Address        Auth COpts EOpts Last Score     Interval   
+====================================================================
+D foo.example.net           Y ----- --TR-    4   1.0   -61ms   +62ms
+* bar.example.net           N ----- -----    0   1.0 -6846us +7305us
++ baz.example.net           N ----- -----   10   1.0 -7381us +7355us
+----
++
+The columns are as follows:
++
+*S*:::
+This column indicates the state of the source after the last source selection.
+It is similar to the state reported by the *sources* command, but more
+states are reported.
+{blank}:::
+The following states indicate the source is not considered selectable for
+synchronisation:
+* _N_ - has the *noselect* option.
+* _M_ - does not have enough measurements.
+* _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
+        <<chrony.conf.adoc#maxjitter,*maxjitter*>> directive).
+* _w_ - waits for other sources to get out of the _M_ state.
+* _S_ - has older measurements than other sources.
+* _O_ - has a stratum equal or larger than the orphan stratum (configured by
+        the <<chrony.conf.adoc#local,*local*>> directive).
+* _T_ - does not fully agree with sources that have the *trust* option.
+* _x_ - does not agree with other sources (falseticker).
+{blank}:::
+The following states indicate the source is considered selectable, but it is
+not currently used for synchronisation:
+* _W_ - waits for other sources to be selectable (required by the
+        <<chrony.conf.adoc#minsources,*minsources*>> directive, or
+        the *require* option of another source).
+* _P_ - another selectable source is preferred due to the *prefer* option.
+* _U_ - waits for a new measurement (after selecting a different best source).
+* _D_ - has, or recently had, a root distance which is too large to be combined
+        with other sources (configured by the
+        <<chrony.conf.adoc#combinelimit,*combinelimit*>> directive).
+{blank}:::
+The following states indicate the source is used for synchronisation of the
+local clock:
+* _+_ - combined with the best source.
+* _*_ - selected as the best source to update the reference data (e.g. root
+        delay, root dispersion).
+*Name/IP address*:::
+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
+source. _Y_ means yes and _N_ means no.
+*COpts*:::
+This column displays the configured selection options of the source.
+* _N_ indicates the *noselect* option.
+* _P_ indicates the *prefer* option.
+* _T_ indicates the *trust* option.
+* _R_ indicates the *require* option.
+*EOpts*:::
+This column displays the current effective selection options of the source,
+which can be different from the configured options due to the authentication
+selection mode (configured by the
+<<chrony.conf.adoc#authselmode,*authselmode*>> directive). The symbols are the
+same as in the *COpts* column.
+*Last*:::
+This column displays how long ago was the last measurement of the source made
+when the selection was performed.
+*Score*:::
+This column displays the current score against the source in the _*_ state. The
+scoring system avoids frequent reselection when multiple sources have a similar
+root distance. A value larger than 1 indicates this source was better than the
+_*_ source in recent selections. If the score reaches 10, the best source will
+be reselected and the scores will be reset to 1.
+*Interval*:::
+This column displays the lower and upper endpoint of the interval which was
+expected to contain the true offset of the local clock considering the root
+distance at the time of the selection.
+
 [[reselect]]*reselect*::
 To avoid excessive switching between sources, *chronyd* can stay synchronised
 to a source even when it is not currently the best one among the available
@@ -454,6 +545,77 @@ the offline state.
 the name of the server or peer was not resolved to an address yet; this source is
 not visible in the *sources* and *sourcestats* reports.
 
+[[authdata]]*authdata* [*-a*]::
+The *authdata* command displays information specific to authentication of NTP
+sources. If the *-a* option is specified, all sources are displayed, including
+those that do not have a known address yet. An example of the output is
+shown below.
++
+----
+Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================
+foo.example.net              NTS     1   15  256 135m    0    0    8  100
+bar.example.net               SK    30   13  128    -    0    0    0    0
+baz.example.net                -     0    0    0    -    0    0    0    0
+----
++
+The columns are as follows:
++
+*Name/IP address*:::
+This column shows the name or the IP address of the source.
+*Mode*:::
+This column shows which mechanism authenticates NTP packets received from the
+source. _NTS_ means Network Time Security, _SK_ means a symmetric key, and _-_
+means authentication is disabled.
+*KeyID*:::
+This column shows an identifier of the key used for authentication. With a
+symmetric key, it is the ID from the <<chrony.conf.adoc#keyfile,key file>>.
+With NTS, it is a number starting at zero and incremented by one with each
+successful key establishment using the NTS-KE protocol, i.e. it shows how many
+times the key establishment was performed with this source.
+*Type*:::
+This columns shows an identifier of the algorithm used for authentication.
+With a symmetric key, it is the hash function or cipher specified in the key
+file. With NTS, it is an authenticated encryption with associated data (AEAD)
+algorithm, which is negotiated in the NTS-KE protocol. The following values can
+be reported:
+* 1: MD5
+* 2: SHA1
+* 3: SHA256
+* 4: SHA384
+* 5: SHA512
+* 6: SHA3-224
+* 7: SHA3-256
+* 8: SHA3-384
+* 9: SHA3-512
+* 10: TIGER
+* 11: WHIRLPOOL
+* 13: AES128
+* 14: AES256
+* 15: AEAD-AES-SIV-CMAC-256
+*KLen*:::
+This column shows the length of the key in bits.
+*Last*:::
+This column shows how long ago the last successful key establishment was
+performed. It is in seconds, or letters _m_, _h_, _d_ or _y_ indicate minutes,
+hours, days, or years.
+*Atmp*:::
+This column shows the number of attempts to perform the key establishment since
+the last successful key establishment. A number larger than 1 indicates a
+problem with the network or server.
+*NAK*:::
+This column shows whether an NTS NAK was received since the last request.
+A NAK indicates that authentication failed on the server side due to
+*chronyd* using a cookie which is no longer valid and that it needs to perform
+the key establishment again in order to get new cookies.
+*Cook*:::
+This column shows the number of NTS cookies that *chronyd* currently has. If
+the key establishment was successful, a number smaller than 8 indicates a
+problem with the network or server.
+*CLen*:::
+This column shows the length in bytes of the NTS cookie which will be used in
+the next request.
+
 [[ntpdata]]*ntpdata* [_address_]::
 The *ntpdata* command displays the last valid measurement and other
 NTP-specific information about the specified NTP source, or all NTP sources
@@ -626,7 +788,7 @@ alternative to the form with mask.
 _address_:::
 This is an IP address or a hostname. The burst command is applied only to
 that source.
-::
+{blank}::
 +
 If no _mask_ or _masked-address_ arguments are provided, every source will be
 matched.
@@ -771,6 +933,11 @@ Sources that stop responding will be replaced with newly resolved addresses
 automatically after 8 polling intervals, but this command can still be useful
 to replace them immediately and not wait until they are marked as unreachable.
 
+[[reload]]*reload* *sources*::
+The *reload sources* command causes *chronyd* to re-read all _*.sources_ files
+from the directories specified by the
+<<chrony.conf.adoc#sourcedir,*sourcedir*>> directive.
+
 [[sourcename]]*sourcename* _address_::
 The *sourcename* command prints the original hostname or address that was
 specified for an NTP source in the configuration file, or the *add* command.
@@ -816,7 +983,7 @@ The columns are as as follows:
 . The regression residual at this point, in seconds. This allows '`outliers`'
   to be easily spotted, so that they can be deleted using the *manual delete*
   command.
-::
+{blank}::
 +
 The *delete* form of the command deletes a single sample. The parameter is the
 index of the sample, as shown in the first column of the output from *manual
@@ -887,10 +1054,17 @@ This command can be used to examine the effect of a series of *allow*, *allow
 all*, *deny*, and *deny all* commands specified either via *chronyc*, or in
 *chronyd*'s configuration file.
 
-[[clients]]*clients*::
+[[clients]]*clients* [*-p* _packets_] [*-k*] [*-r*]::
 This command shows a list of clients that have accessed the server, through
-either the NTP or command ports. It does not include accesses over
+the NTP, command, or NTS-KE port. It does not include accesses over the Unix
-the Unix domain command socket. There are no arguments.
+domain command socket.
++
+The *-p* option specifies the minimum number of received NTP or command
+packets, or accepted NTS-KE connections, needed to include a client in the
+list. The default value is 0, i.e. all clients are reported. With the *-k*
+option the last four columns will show the NTS-KE accesses instead of command
+accesses. If the *-r* option is specified, *chronyd* will reset the counters of
+received and dropped packets or connections after reporting the current values.
 +
 An example of the output is:
 +
@@ -915,20 +1089,22 @@ The columns are as follows:
 . The average interval between NTP packets.
 . The average interval between NTP packets after limiting the response rate.
 . Time since the last NTP packet was received
-. The number of command packets received from the client.
+. The number of command packets or NTS-KE connections received/accepted from
-. The number of command packets dropped to limit the response rate.
+  the client.
-. The average interval between command packets.
+. The number of command packets or NTS-KE connections dropped to limit the
-. Time since the last command packet was received.
+  response rate.
+. The average interval between command packets or NTS-KE connections.
+. Time since the last command packet or NTS-KE connection was
+  received/accepted.
 
 [[serverstats]]*serverstats*::
-The *serverstats* command displays how many valid NTP and command requests
+The *serverstats* command displays how many valid NTP and command requests, and
-*chronyd* as a server received from clients, how many of them were dropped to
+NTS-KE connections, *chronyd* operating as a server received from clients, and
-limit the response rate as configured by the
+how many of them were dropped due to rate limiting. It also displays how many
-<<chrony.conf.adoc#ratelimit,*ratelimit*>> and
-<<chrony.conf.adoc#cmdratelimit,*cmdratelimit*>> directives, and how many
 client log records were dropped due to the memory limit configured by the
-<<chrony.conf.adoc#clientloglimit,*clientloglimit*>> directive. An example of
+<<chrony.conf.adoc#clientloglimit,*clientloglimit*>> directive and how many of
-the output is shown below.
+the NTP requests (from those which were not dropped) were authenticated. An
+example of the output is shown below.
 +
 ----
 NTP packets received       : 1598
@@ -936,6 +1112,9 @@ NTP packets dropped        : 8
 Command packets received   : 19
 Command packets dropped    : 0
 Client log records dropped : 0
+NTS-KE connections accepted: 3
+NTS-KE connections dropped : 0
+Authenticated NTP packets  : 189
 ----
 
 [[allow]]*allow* [*all*] [_subnet_]::
@@ -1121,7 +1300,7 @@ more than 1 second away from the system clock):
   error).
 . Save the RTC parameters to the RTC file (specified with the
   <<chrony.conf.adoc#rtcfile,*rtcfile*>> directive in the configuration file).
-::
+{blank}::
 +
 The last step is done as a precaution against the computer suffering a power
 failure before either the daemon exits or the <<writertc,*writertc*>> command
@@ -1154,10 +1333,7 @@ purged. An example of how to do this is shown below.
 ----
 # mv /var/log/chrony/measurements.log /var/log/chrony/measurements1.log
 # chronyc cyclelogs
-# ls -l /var/log/chrony
+# rm /var/log/chrony/measurements1.log
--rw-r--r--   1 root     root            0 Jun  8 18:17 measurements.log
--rw-r--r--   1 root     root        12345 Jun  8 18:17 measurements1.log
-# rm -f measurements1.log
 ----
 
 [[dump]]*dump*::
@@ -1177,12 +1353,14 @@ also re-reads the server NTS keys if
 <<chrony.conf.adoc#ntsrotate,automatic rotation>> is disabled in the
 configuration file.
 
-[[reset]]*reset*::
+[[reset]]*reset* *sources*::
-The *reset* command causes *chronyd* to drop all measurements and switch to the
+The *reset sources* command causes *chronyd* to drop all measurements and
-unsynchronised state. This command can help *chronyd* with recovery when the
+switch to the unsynchronised state. This command can help *chronyd* with
-measurements are known to be no longer valid or accurate, e.g. due to moving
+recovery when the measurements are known to be no longer valid or accurate,
-the computer to a different network, or resuming the computer from a low-power
+e.g. due to moving the computer to a different network, or resuming the
-state (which resets the system clock).
+computer from a low-power state (which resets the system clock). *chronyd* will
+drop the measurements automatically when it detects the clock has made an
+unexpected jump, but the detection is not completely reliable.
 
 [[shutdown]]*shutdown*::
 The *shutdown* command causes *chronyd* to exit. This is equivalent to sending
@@ -1249,7 +1427,13 @@ keygen 73 SHA1 256
 +
 which generates a 256-bit SHA1 key with number 73. The printed line should
 then be securely transferred and added to the key files on both server and
-client, or peers.
+client, or peers. A different key should be generated for each client or peer.
++
+An example using the AES128 cipher is:
++
+----
+keygen 151 AES128
+----
 
 [[exit]]*exit*::
 [[quit]]*quit*::

doc/chronyd.adoc

@@ -55,7 +55,7 @@ IPv6 sockets will be created.
 
 *-f* _file_::
 This option can be used to specify an alternate location for the configuration
-file. The default value is _@SYSCONFDIR@/chrony.conf_.
+file. The compiled-in default value is _@SYSCONFDIR@/chrony.conf_.
 
 *-n*::
 When run in this mode, the program will not detach itself from the terminal.
@@ -76,6 +76,12 @@ the log file, syslog, or terminal. The following levels can be specified:
 0 (informational), 1 (warning), 2 (non-fatal error), and 3 (fatal error). The
 default value is 0.
 
+*-p*::
+When run in this mode, *chronyd* will print the configuration and exit. It will
+not detach from the terminal. This option can be used to verify the syntax of
+the configuration and get the whole configuration, even if it is split into
+multiple files and read by the *include* or *confdir* directive.
+
 *-q*::
 When run in this mode, *chronyd* will set the system clock once and exit. It
 will not detach from the terminal.
@@ -131,7 +137,7 @@ running, but still allow it to adjust the frequency of the system clock.
 *-u* _user_::
 This option sets the name of the system user to which *chronyd* will switch
 after start in order to drop root privileges. It overrides the
-<<chrony.conf.adoc#user,*user*>> directive. The default value is
+<<chrony.conf.adoc#user,*user*>> directive. The compiled-in default value is
 _@DEFAULT_USER@_.
 +
 On Linux, *chronyd* needs to be compiled with support for the *libcap* library.
@@ -139,6 +145,16 @@ On macOS, FreeBSD, NetBSD and Solaris *chronyd* forks into two processes.
 The child process retains root privileges, but can only perform a very limited
 range of privileged system calls on behalf of the parent.
 
+*-U*::
+This option disables a check for root privileges to allow *chronyd* to be
+started under a non-root user, assuming the process will have all capabilities
+(e.g. provided by the service manager) and access to all files, directories,
+and devices, needed to operate correctly in the specified configuration. Note
+that different capabilities might be needed with different configurations and
+different Linux kernel versions. Starting *chronyd* under a non-root user is
+not recommended when the configuration is not known, or at least limited to
+specific directives.
+
 *-F* _level_::
 This option configures a system call filter when *chronyd* is compiled with
 support for the Linux secure computing (seccomp) facility. In level 1 the
@@ -146,10 +162,10 @@ process is killed when a forbidden system call is made, in level -1 the SIGSYS
 signal is thrown instead and in level 0 the filter is disabled. The default
 value is 0.
 +
-It's recommended to enable the filter only when it's known to work on the
+It is recommended to enable the filter only when it is known to work on the
 version of the system where *chrony* is installed as the filter needs to allow
 also system calls made from libraries that *chronyd* is using (e.g. libc) and
-different versions or implementations of the libraries may make different
+different versions or implementations of the libraries might make different
 system calls. If the filter is missing some system call, *chronyd* could be
 killed even in normal operation.
 
@@ -168,10 +184,8 @@ This mode is only supported on Linux.
 This option disables the control of the system clock. *chronyd* will not try to
 make any adjustments of the clock. It will assume the clock is free running and
 still track its offset and frequency relative to the estimated true time. This
-option allows *chronyd* to run without the capability to adjust or set the
+option allows *chronyd* to be started without the capability to adjust or set
-system clock (e.g. in some containers) in order to operate as an NTP server. It
+the system clock (e.g. in some containers) to operate as an NTP server.
-is not recommended to run *chronyd* (with or without *-x*) when another process
-is controlling the system clock.
 
 *-v*::
 With this option *chronyd* will print version number to the terminal and exit.

doc/faq.adoc

@@ -1,7 +1,7 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
-// Copyright (C) Miroslav Lichvar  2014-2016
+// Copyright (C) Miroslav Lichvar  2014-2016, 2020
 //
 // 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
@@ -24,17 +24,20 @@
 
 === How does `chrony` compare to `ntpd`?
 
-`chronyd` was designed to work well in a wide range of conditions and it can
+`chrony` and `ntpd` are two different implementations of the Network Time
-usually synchronise the system clock faster and with better time accuracy. It
+Protocol (NTP).
-doesn't implement some of the less useful NTP modes like broadcast client or
+
-multicast server/client.
+`chrony` is a newer implementation, which was designed to work well in a wider
+range of conditions. It can usually synchronise the system clock faster and
+with better time accuracy. It has many features, but it does not implement some
+of the less useful NTP modes like broadcast client or multicast server/client.
 
 If your computer is connected to the Internet only for few minutes at a time,
 the network connection is often congested, you turn your computer off or
 suspend it frequently, the clock is not very stable (e.g. there are rapid
-changes in the temperature or it's a virtual machine), or you want to use NTP
+changes in the temperature or it is a virtual machine), or you want to use NTP
 on an isolated network with no hardware reference clocks in sight, `chrony`
-will probably work much better for you.
+will probably work better for you.
 
 For a more detailed comparison of features and performance, see the
 https://chrony.tuxfamily.org/comparison.html[comparison page] on the `chrony`
@@ -59,7 +62,7 @@ slewing, which would take a very long time. The `makestep` directive does
 that.
 
 In order to keep the real-time clock (RTC) close to the true time, so the
-system time is reasonably close to the true time when it's initialised on the
+system time is reasonably close to the true time when it is initialised on the
 next boot from the RTC, the `rtcsync` directive enables a mode in which the
 system time is periodically copied to the RTC. It is supported on Linux and
 macOS.
@@ -75,52 +78,36 @@ makestep 1 3
 rtcsync
 ----
 
-=== How do I make an NTP server from an NTP client?
+=== How do I make an NTP server?
 
 You need to add an `allow` directive to the _chrony.conf_ file in order to open
 the NTP port and allow `chronyd` to reply to client requests. `allow` with no
 specified subnet allows access from all IPv4 and IPv6 addresses.
 
-=== I have several computers on a LAN. Should be all clients of an external server?
+=== Should all computers on a LAN be clients of an external server?
 
-The best configuration is usually to make one computer the server, with
+It depends on the requirements. Usually, the best configuration is to make one
-the others as clients of it. Add a `local` directive to the server's
+computer the server, with the others as clients of it. Add a `local` directive
-_chrony.conf_ file. This configuration will be better because
+to the server's _chrony.conf_ file. This configuration will be better because
 
 * the load on the external connection is less
 * the load on the external NTP server(s) is less
 * if your external connection goes down, the computers on the LAN
   will maintain a common time with each other.
 
-=== Must I specify servers by IP address if DNS is not available on chronyd start?
+=== Must I specify servers by IP address if DNS is not available on `chronyd` start?
 
-No. Starting from version 1.25, `chronyd` will keep trying to resolve
+No, `chronyd` will keep trying to resolve
 the names specified by the `server`, `pool`, and `peer` directives in an
 increasing interval until it succeeds. The `online` command can be issued from
 `chronyc` to force `chronyd` to try to resolve the names immediately.
 
 === How can I make `chronyd` more secure?
 
-If you don't need to serve time to NTP clients or peers, you can add `port 0`
+If you do not need to use `chronyc`, or you want to run `chronyc` only
-to the _chrony.conf_ file to completely disable the NTP server functionality
-and prevent NTP requests from reaching `chronyd`. Starting from version 2.0,
-the NTP server port is open only when client access is allowed by the `allow`
-directive or command, an NTP peer is configured, or the `broadcast` directive
-is used.
-
-If you don't need to use `chronyc` remotely, you can add the following
-directives to the configuration file to bind the command sockets to the
-loopback interface. This is done by default since version 2.0.
-
-----
-bindcmdaddress 127.0.0.1
-bindcmdaddress ::1
-----
-
-If you don't need to use `chronyc` at all or you need to run `chronyc` only
 under the root or _chrony_ user (which can access `chronyd` through a Unix
-domain socket since version 2.2), you can disable the internet command sockets
+domain socket), you can disable the IPv4 and IPv6 command sockets (by default
-completely by adding `cmdport 0` to the configuration file.
+listening on localhost) by adding `cmdport 0` to the configuration file.
 
 You can specify an unprivileged user with the `-u` option, or the `user`
 directive in the _chrony.conf_ file, to which `chronyd` will switch after start
@@ -133,23 +120,23 @@ a very limited range of privileged system calls on behalf of the parent.
 Also, if `chronyd` is compiled with support for the Linux secure computing
 (seccomp) facility, you can enable a system call filter with the `-F` option.
 It will significantly reduce the kernel attack surface and possibly prevent
-kernel exploits from the `chronyd` process if it's compromised. It's
+kernel exploits from the `chronyd` process if it is compromised. It is
-recommended to enable the filter only when it's known to work on the version of
+recommended to enable the filter only when it is known to work on the version of
 the system where `chrony` is installed as the filter needs to allow also system
 calls made from libraries that `chronyd` is using (e.g. libc) and different
-versions or implementations of the libraries may make different system calls.
+versions or implementations of the libraries might make different system calls.
 If the filter is missing some system call, `chronyd` could be killed even in
 normal operation.
 
 === How can I improve the accuracy of the system clock with NTP sources?
 
 Select NTP servers that are well synchronised, stable and close to your
-network. It's better to use more than one server, three or four is usually
+network. It is better to use more than one server, three or four is usually
 recommended as the minimum, so `chronyd` can detect servers that serve false
 time and combine measurements from multiple sources.
 
 If you have a network card with hardware timestamping supported on Linux, it
-can be enabled by the *hwtimestamp* directive in the _chrony.conf_ file. It
+can be enabled by the `hwtimestamp` directive in the _chrony.conf_ file. It
 should make local receive and transmit timestamps of NTP packets much more
 accurate.
 
@@ -163,8 +150,8 @@ default values are 6 (64 seconds) for `minpoll`, 10 (1024 seconds) for
 `maxpoll` and 8 (samples) for `polltarget`. The default values should be used
 for general servers on the Internet. With your own NTP servers, or if you have
 permission to poll some servers more frequently, setting these options for
-shorter polling intervals may significantly improve the accuracy of the system
+shorter polling intervals might significantly improve the accuracy of the
-clock.
+system clock.
 
 The optimal polling interval depends mainly on two factors, stability of the
 network latency and stability of the system clock (which mainly depends on the
@@ -174,7 +161,7 @@ temperature change).
 Generally, if the `sourcestats` command usually reports a small number of
 samples retained for a source (e.g. fewer than 16), a shorter polling interval
 should be considered. If the number of samples is usually at the maximum of 64,
-a longer polling interval may work better.
+a longer polling interval might work better.
 
 An example of the directive for an NTP server on the Internet that you are
 allowed to poll frequently could be
@@ -210,7 +197,7 @@ server ntp.local minpoll 2 maxpoll 4 xleave
 
 When combined with local hardware timestamping, good network switches, and even
 shorter polling intervals, a sub-microsecond accuracy and stability of a few
-tens of nanoseconds may be possible. For example:
+tens of nanoseconds might be possible. For example:
 
 ----
 server ntp.local minpoll 0 maxpoll 0 xleave
@@ -221,10 +208,11 @@ For best stability, the CPU should be running at a constant frequency (i.e.
 disabled power saving and performance boosting). Energy-Efficient Ethernet
 (EEE) should be disabled in the network. The switches should be configured to
 prioritize NTP packets, especially if the network is expected to be heavily
-loaded.
+loaded. The `dscp` directive can be used to set the Differentiated Services
+Code Point in transmitted NTP packets if needed.
 
-If it is acceptable for NTP clients in the network to send requests at an
+If it is acceptable for NTP clients in the network to send requests at a high
-excessive rate, a sub-second polling interval may be specified. A median filter
+rate, a sub-second polling interval can be specified. A median filter
 can be enabled in order to update the clock at a reduced rate with more stable
 measurements. For example:
 
@@ -237,7 +225,7 @@ hwtimestamp eth0 minpoll -6
 
 Yes. With the `-q` option `chronyd` will set the system clock once and exit.
 With the `-Q` option it will print the measured offset without setting the
-clock. If you don't want to use a configuration file, NTP servers can be
+clock. If you do not want to use a configuration file, NTP servers can be
 specified on the command line. For example:
 
 ----
@@ -249,17 +237,28 @@ well synchronised and responding to all requests. If not synchronised or
 responding, it would take about 10 seconds for `chronyd` to give up and exit
 with a non-zero status. A faster configuration is possible. A single server can
 be used instead of four servers, the number of measurements can be reduced with
-the `maxsamples` option, and a timeout can be specified with the `-t` option.
+the `maxsamples` option to one (supported in `chrony` version 4.0), and a
-The following command would take only up to about 1 second.
+timeout can be specified with the `-t` option. The following command would take
+only up to about one second.
 
 ----
 # chronyd -q -t 1 'server pool.ntp.org iburst maxsamples 1'
 ----
 
+It is not recommended to run `chronyd` with the `-q` option periodically (e.g.
+from a cron job) as a replacement for the daemon mode, because it performs
+significantly worse (e.g. the clock is stepped and its frequency is not
+corrected). If you must run it this way and you are using a public NTP server,
+make sure `chronyd` does not always start around the first second of a minute,
+e.g. by adding a random sleep before the `chronyd` command. Public servers
+typically receive large bursts of requests around the first second as there is
+a large number of NTP clients started from cron with no delay.
+
 === Can `chronyd` be configured to control the clock like `ntpd`?
 
 It is not possible to perfectly emulate `ntpd`, but there are some options that
-can configure `chronyd` to behave more like `ntpd`.
+can configure `chronyd` to behave more like `ntpd` if there is a reason to
+prefer that.
 
 In the following example the `minsamples` directive slows down the response to
 changes in the frequency and offset of the clock. The `maxslewrate` and
@@ -279,10 +278,56 @@ maxchange 1000 1 1
 maxclockerror 15
 ----
 
-Note that increasing `minsamples` may cause the offsets in the `tracking` and
+Note that increasing `minsamples` might cause the offsets in the `tracking` and
 `sourcestats` reports/logs to be significantly smaller than the actual offsets
 and be unsuitable for monitoring.
 
+=== Can NTP server be separated from NTP client?
+
+Yes, it is possible to run multiple instances of `chronyd` on the same
+computer. One can be configured as an NTP client, and another as a server. They
+need to use different pidfiles, NTP ports, command ports, and Unix domain
+command sockets. The server instance should be started with the `-x` option to
+avoid touching the clock. It can be configured to serve the system time with
+the `local` directive, or synchronise its NTP clock to the client instance
+running on localhost using a non-standard NTP port.
+
+On Linux, starting with `chrony` version 4.0, it is also possible to run
+multiple server instances sharing a port to utilise multiple cores of the CPU.
+Note that the client/server interleaved mode requires that all packets from an
+address are handled by the same server instance.
+
+=== Should be a leap smear enabled on NTP server?
+
+With the `smoothtime` and `leapsecmode` directives it is possible to enable a
+server leap smear in order to hide leap seconds from clients and force them to
+follow a slow server's adjustment instead.
+
+This feature should be used only in local networks and only when necessary,
+e.g. when the clients cannot be configured to handle the leap seconds as
+needed, or their number is so large that configuring them all would be
+impractical. The clients should use only one leap-smearing server, or multiple
+identically configured leap-smearing servers. Note that some clients can get
+leap seconds from external sources (e.g. with the `leapsectz` directive in
+`chrony`) and they will not work correctly with a leap smearing server.
+
+=== Does `chrony` support PTP?
+
+No, the Precision Time Protocol (PTP) is not supported and there are no plans
+to support it. It is a complex protocol, which shares some issues with the
+NTP broadcast mode. One of the main differences between NTP and PTP is that PTP
+was designed to be easily supported in hardware (e.g. network switches and
+routers) in order to make more stable and accurate measurements. PTP relies on
+the hardware support. NTP does not rely on any support in the hardware, but if
+it had the same support as PTP, it could perform equally well.
+
+On Linux, `chrony` supports hardware clocks that some NICs have for PTP. They
+are called PTP hardware clocks (PHC). They can be used as reference clocks
+(specified by the `refclock` directive) and for hardware timestamping of NTP
+packets (enabled by the `hwtimestamp` directive) if the NIC can timestamp other
+packets than PTP, which is usually the case at least for transmitted packets.
+The `ethtool -T` command can be used to verify the timestamping support.
+
 === What happened to the `commandkey` and `generatecommandkey` directives?
 
 They were removed in version 2.2. Authentication is no longer supported in the
@@ -299,11 +344,11 @@ following questions.
 
 === Behind a firewall?
 
-Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it's
+Check the `Reach` value printed by the ``chronyc``'s `sources` command. If it
-zero, it means `chronyd` did not get any valid responses from the NTP server
+is zero, it means `chronyd` did not get any valid responses from the NTP server
 you are trying to use. If there is a firewall between you and the server, the
-packets may be blocked. Try using a tool like `wireshark` or `tcpdump` to see
+packets might be blocked. Try using a tool like `wireshark` or `tcpdump` to see
-if you're getting any responses from the server.
+if you are getting any responses from the server.
 
 When `chronyd` is receiving responses from the servers, the output of the
 `sources` command issued few minutes after `chronyd` start might look like
@@ -320,9 +365,10 @@ MS Name/IP address         Stratum Poll Reach LastRx Last sample
 
 === Are NTP servers specified with the `offline` option?
 
-Check that you're using ``chronyc``'s `online` and `offline` commands
+Check that the ``chronyc``'s `online` and `offline` commands are used
-appropriately. The `activity` command prints the number of sources that are
+appropriately (e.g. in the system networking scripts). The `activity` command
-currently online and offline. For example:
+prints the number of sources that are currently online and offline. For
+example:
 
 ----
 200 OK
@@ -349,9 +395,9 @@ makestep 1 3
 ----
 
 the clock would be stepped in the first three updates if its offset was larger
-than one second. Normally, it's recommended to allow the step only in the first
+than one second. Normally, it is recommended to allow the step only in the first
 few updates, but in some cases (e.g. a computer without an RTC or virtual
-machine which can be suspended and resumed with an incorrect time) it may be
+machine which can be suspended and resumed with an incorrect time) it might be
 necessary to allow the step on any clock update. The example above would change
 to
 
@@ -363,7 +409,7 @@ makestep 1 -1
 
 A common issue with Windows NTP servers is that they report a very large root
 dispersion (e.g. three seconds or more), which causes `chronyd` to ignore the
-server for being too inaccurate. The `sources` command may show a valid
+server for being too inaccurate. The `sources` command might show a valid
 measurement, but the server is not selected for synchronisation. You can check
 the root dispersion of the server with the ``chronyc``'s `ntpdata` command.
 
@@ -374,6 +420,29 @@ synchronisation to such a server. For example:
 maxdistance 16.0
 ----
 
+=== An unreachable source is selected?
+
+When `chronyd` is configured with multiple time sources, it tries to select the
+most accurate and stable sources for synchronisation of the system clock. They
+are marked with the _*_ or _+_ symbol in the report printed by the `sources`
+command.
+
+When the best source (marked with the _*_ symbol) becomes unreachable (e.g. NTP
+server stops responding), or the measurements are no longer accepted (e.g. a
+change in network routing adds a delay), `chronyd` will not immediately switch
+to the second best source in an attempt to minimise the error of the clock. It
+will let the clock run free for as long as its estimated error (in terms of
+root distance) based on previous measurements is smaller than the estimated
+error of the second source, and there is still an interval which contains some
+measurements from both sources.
+
+If the first source was significantly better than the second source, it can
+take many hours (up to 64 times the maximum polling interval) before the second
+source is selected. If you do not like this behaviour, you can force a faster
+reselection by increasing the clock error rate (`maxclockerror` directive),
+shortening the polling interval (`maxpoll` option), or reducing the number of
+samples (`maxsamples` option).
+
 === Using a PPS reference clock?
 
 A pulse-per-second (PPS) reference clock requires a non-PPS time source to
@@ -409,31 +478,33 @@ to be used for synchronisation.
 When accessing `chronyd` remotely, make sure that the _chrony.conf_ file (on
 the computer where `chronyd` is running) has a `cmdallow` entry for the
 computer you are running `chronyc` on and an appropriate `bindcmdaddress`
-directive. This isn't necessary for localhost.
+directive. This is not necessary for localhost.
 
 Perhaps `chronyd` is not running. Try using the `ps` command (e.g. on Linux,
-`ps -auxw`) to see if it's running. Or try `netstat -a` and see if the ports
+`ps -auxw`) to see if it is running. Or try `netstat -a` and see if the UDP
-123/udp and 323/udp are listening. If `chronyd` is not running, you may have a
+port 323 is listening. If `chronyd` is not running, you might have a problem
-problem with the way you are trying to start it (e.g. at boot time).
+with the way you are trying to start it (e.g. at boot time).
 
-Perhaps you have a firewall set up in a way that blocks packets on port
+Perhaps you have a firewall set up in a way that blocks packets on the UDP
-323/udp. You need to amend the firewall configuration in this case.
+port 323. You need to amend the firewall configuration in this case.
 
 === I keep getting the error `501 Not authorised`
 
-Since version 2.2, the `password` command doesn't do anything and `chronyc`
+This error indicates that `chronyc` sent the command to `chronyd` using a UDP
-needs to run locally under the root or _chrony_ user, which are allowed to
+socket instead of the Unix domain socket (e.g. _/var/run/chrony/chronyd.sock_),
-access the ``chronyd``'s Unix domain command socket.
+which is required for some commands. For security reasons, only the root and
+_chrony_ users are allowed to access the socket.
 
-With older versions, you need to authenticate with the `password` command first
+It is also possible that the socket does not exist. `chronyd` will not create
-or use the `-a` option to authenticate automatically on start. The
+the socket if the directory has a wrong owner or permissions. In this case
-configuration file needs to specify a file which contains keys (`keyfile`
+there should be an error message from `chronyd` in the system log.
-directive) and which key in the key file should be used for `chronyc`
-authentication (`commandkey` directive).
 
-=== Why does `chronyc tracking` always print an IPv4 address as reference ID?
+=== What is the reference ID reported by the `tracking` command?
 
-The reference ID is a 32-bit value and in versions before 3.0 it was printed in
+The reference ID is a 32-bit value used in NTP to prevent synchronisation
+loops.
+
+In `chrony` versions before 3.0 it was printed in the
 quad-dotted notation, even if the reference source did not actually have an
 IPv4 address. For IPv4 addresses, the reference ID is equal to the address, but
 for IPv6 addresses it is the first 32 bits of the MD5 sum of the address. For
@@ -457,7 +528,7 @@ Only by the source code. See _cmdmon.c_ (`chronyd` side) and _client.c_
 === What is the real-time clock (RTC)?
 
 This is the clock which keeps the time even when your computer is turned off.
-It is used to initialise the system clock on boot. It normally doesn't drift
+It is used to initialise the system clock on boot. It normally does not drift
 more than few seconds per day.
 
 There are two approaches how `chronyd` can work with it. One is to use the
@@ -472,17 +543,17 @@ monitor the rate at which the RTC gains or loses time. When `chronyd` is
 started with the `-s` option on the next boot, it will set the system time from
 the RTC and also compensate for the drift it has measured previously. The
 `rtcautotrim` directive can be used to keep the RTC close to the true time, but
-it's not strictly necessary if its only purpose is to set the system clock when
+it is not strictly necessary if its only purpose is to set the system clock when
 `chronyd` is started on boot. See the documentation for details.
 
-=== I want to use ``chronyd``'s RTC support. Must I disable `hwclock`?
+=== Does `hwclock` have to be disabled?
 
 The `hwclock` program is often set-up by default in the boot and shutdown
 scripts with many Linux installations. With the kernel RTC synchronisation
 (`rtcsync` directive), the RTC will be set also every 11 minutes as long as the
 system clock is synchronised. If you want to use ``chronyd``'s RTC monitoring
-(`rtcfile` directive), it's important to disable `hwclock` in the shutdown
+(`rtcfile` directive), it is important to disable `hwclock` in the shutdown
-procedure. If you don't, it will over-write the RTC with a new value, unknown
+procedure. If you do not that, it will over-write the RTC with a new value, unknown
 to `chronyd`. At the next reboot, `chronyd` started with the `-s` option will
 compensate this (wrong) time with its estimate of how far the RTC has drifted
 whilst the power was off, giving a meaningless initial system time.
@@ -501,7 +572,7 @@ things
 
 === I get `Could not open /dev/rtc, Device or resource busy` in my syslog file
 
-Some other program running on the system may be using the device.
+Some other program running on the system might be using the device.
 
 === What if my computer does not have an RTC or backup battery?
 
@@ -516,7 +587,7 @@ observe backward steps.
 === Can `chronyd` be driven from broadcast/multicast NTP servers?
 
 No, the broadcast/multicast client mode is not supported and there is currently
-no plan to implement it. While the mode may be useful to simplify configuration
+no plan to implement it. While this mode can simplify configuration
 of clients in large networks, it is inherently less accurate and less secure
 (even with authentication) than the ordinary client/server mode.
 
@@ -533,7 +604,8 @@ thousands of clients using the ordinary client/server mode.
 
 Yes, the `broadcast` directive can be used to enable the broadcast server mode
 to serve time to clients in the network which support the broadcast client mode
-(it's not supported in `chronyd`, see the previous question).
+(it is not supported in `chronyd`). Note that this mode should generally be
+avoided. See the previous question.
 
 === Can `chronyd` keep the system clock a fixed offset away from real time?
 
@@ -549,9 +621,21 @@ offline, `chronyd` would make new measurements immediately after issuing the
 `online` command.
 
 Unless the network connection lasts only few minutes (less than the maximum
-polling interval), the delay is usually not a problem, and it may be acceptable
+polling interval), the delay is usually not a problem, and it might be acceptable
 to keep all sources online all the time.
 
+=== Why is an offset measured between two computers synchronised to each another?
+
+When two computers are synchronised to each other using the client/server or
+symmetric NTP mode, there is an expectation that NTP measurements between the
+two computers made on both ends show an average offset close to zero.
+
+With `chronyd` that can be expected only when the interleaved mode (`xleave`
+option) is enabled. Otherwise, `chronyd` will use different transmit timestamps
+(e.g. daemon timestamp vs kernel timestamp) for serving time and
+synchronisation of its own clock, which creates an asymmetry in the
+timestamping and causes the other end to measure a significant offset.
+
 == Operating systems
 
 === Does `chrony` support Windows?

doc/installation.adoc

@@ -100,7 +100,7 @@ than MD5, which can be used for NTP authentication with a symmetric key. If you
 don't want to enable the support, specify the `--disable-sechash` flag to
 `configure`.
 
-If development files for the editline or readline library are available,
+If development files for the editline library are available,
 `chronyc` will be built with line editing support. If you don't want this,
 specify the `--disable-readline` flag to `configure`.
 
@@ -170,43 +170,6 @@ https://github.com/seccomp/libseccomp[libseccomp] library and the
 the kernel attack surface and possibly prevent kernel exploits from `chronyd`
 if it is compromised.
 
-== Support for line editing libraries
-
-`chronyc` can be built with support for line editing, this allows you to use
-the cursor keys to replay and edit old commands. Two libraries are supported
-which provide such functionality, editline and GNU readline.
-
-Please note that readline since version 6.0 is licensed under GPLv3+ which is
-incompatible with chrony's license GPLv2. You should use editline instead if
-you don't want to use older readline versions.
-
-The `configure` script will automatically enable the line editing support if
-one of the supported libraries is available. If they are both available, the
-editline library will be used.
-
-If you don't want to use it (in which case `chronyc` will use a minimal command
-line interface), invoke `configure` like this:
-
-----
-./configure --disable-readline other-options...
-----
-
-If you have editline, readline or ncurses installed in locations that aren't
-normally searched by the compiler and linker, you need to use extra options:
-
-`--with-readline-includes=directory_name`::
-  This defines the name of the directory above the one where `readline.h` is.
-  `readline.h` is assumed to be in `editline` or `readline` subdirectory of the
-  named directory.
-
-`--with-readline-library=directory_name`::
-  This defines the directory containing the `libedit.a` or `libedit.so` file,
-  or `libreadline.a` or `libreadline.so` file.
-
-`--with-ncurses-library=directory_name`::
-  This defines the directory containing the `libncurses.a` or `libncurses.so`
-  file.
-
 == Extra options for package builders
 
 The `configure` and `make` procedures have some extra options that may be

examples/chrony-wait.service

@@ -8,9 +8,11 @@ Wants=time-sync.target
 
 [Service]
 Type=oneshot
-# Wait up to ~10 minutes for chronyd to synchronize and the remaining
+# Wait for chronyd to update the clock and the remaining
-# clock correction to be less than 0.1 seconds
+# correction to be less than 0.1 seconds
-ExecStart=/usr/bin/chronyc -h 127.0.0.1,::1 waitsync 600 0.1 0.0 1
+ExecStart=/usr/bin/chronyc -h 127.0.0.1,::1 waitsync 0 0.1 0.0 1
+# Wait for at most 3 minutes
+TimeoutStartSec=180
 RemainAfterExit=yes
 StandardOutput=null
 

examples/chrony.conf.example2

@@ -25,9 +25,18 @@ rtcsync
 # Serve time even if not synchronized to a time source.
 #local stratum 10
 
+# Require authentication (nts or key option) for all NTP sources.
+#authselectmode require
+
 # Specify file containing keys for NTP authentication.
 #keyfile /etc/chrony.keys
 
+# Save NTS keys and cookies.
+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
 

examples/chrony.conf.example3

@@ -57,6 +57,20 @@
 
 ! maxdrift 100
 
+# By default, chronyd allows synchronisation to an unauthenticated NTP
+# source (i.e. specified without the nts and key options) if it agrees with
+# a majority of authenticated NTP sources, or if no authenticated source is
+# specified.  If you don't want chronyd to ever synchronise to an
+# unauthenticated NTP source, uncomment the first from the following lines.
+# If you don't want to synchronise to an unauthenticated NTP source only
+# when an authenticated source is specified, uncomment the second line.
+# If you want chronyd to ignore authentication in the source selection,
+# uncomment the third line.
+
+! authselectmode require
+! authselectmode prefer
+! authselectmode ignore
+
 #######################################################################
 ### FILENAMES ETC
 # Chrony likes to keep information about your computer's clock in files.
@@ -72,22 +86,37 @@ driftfile /var/lib/chrony/drift
 
 ! keyfile /etc/chrony.keys
 
+# If you specify an NTP server with the nts option to enable authentication
+# with the Network Time Security (NTS) mechanism, or enable server NTS with
+# the ntsservercert and ntsserverkey directives below, the following line will
+# allow the client/server to save the NTS keys and cookies in order to reduce
+# the number of key establishments (NTS-KE sessions).
+
+ntsdumpdir /var/lib/chrony
+
+# If chronyd is configured to act as an NTP server and you want to enable NTS
+# for its clients, you will need a TLS certificate and private key.  Uncomment
+# and edit the following lines to specify the locations of the certificate and
+# key.
+
+! ntsservercert /etc/.../foo.example.net.crt
+! ntsserverkey /etc/.../foo.example.net.key
+
 # chronyd can save the measurement history for the servers to files when
-# it it exits.  This is useful in 2 situations:
+# it exits.  This is useful in 2 situations:
 #
-# 1. On Linux, if you stop chronyd and restart it with '-r' (e.g. after
+# 1. If you stop chronyd and restart it with the '-r' option (e.g. after
 # an upgrade), the old measurements will still be relevant when chronyd
 # is restarted.  This will reduce the time needed to get accurate
-# gain/loss measurements, especially with a dial-up link.
+# gain/loss measurements.
 #
-# 2. Again on Linux, if you use the RTC support and start chronyd with
+# 2. On Linux, if you use the RTC support and start chronyd with
 # '-r -s' on bootup, measurements from the last boot will still be
 # useful (the real time clock is used to 'flywheel' chronyd between
 # boots).
 #
-# Enable these two options to use this.
+# Uncomment the following line to use this.
 
-! dumponexit
 ! dumpdir /var/lib/chrony
 
 # chronyd writes its process ID to a file.  If you try to start a second
@@ -116,6 +145,18 @@ driftfile /var/lib/chrony/drift
 
 ! makestep 1.0 3
 
+#######################################################################
+### LEAP SECONDS
+# A leap second is an occasional one-second correction of the UTC
+# time scale.  By default, chronyd tells the kernel to insert/delete
+# the leap second, which makes a backward/forward step to correct the
+# clock for it.  As with the makestep directive, this jump can upset
+# some applications.  If you prefer chronyd to make a gradual
+# correction, causing the clock to be off for a longer time, uncomment
+# the following line.
+
+! leapsecmode slew
+
 #######################################################################
 ### LOGGING
 # If you want to log information about the time measurements chronyd has
@@ -135,8 +176,6 @@ driftfile /var/lib/chrony/drift
 #######################################################################
 ### ACTING AS AN NTP SERVER
 # You might want the computer to be an NTP server for other computers.
-# e.g.  you might be running chronyd on a dial-up machine that has a LAN
-# sitting behind it with several 'satellite' computers on it.
 #
 # By default, chronyd does not allow any clients to access it.  You need
 # to explicitly enable access using 'allow' and 'deny' directives.
@@ -152,15 +191,6 @@ driftfile /var/lib/chrony/drift
 # You can have as many allow and deny directives as you need.  The order
 # is unimportant.
 
-# If you want chronyd to act as an NTP broadcast server, enable and edit
-# (and maybe copy) the following line.  This means that a broadcast
-# packet is sent to the address 192.168.1.255 every 60 seconds.  The
-# address MUST correspond to the broadcast address of one of the network
-# interfaces on your machine.  If you have multiple network interfaces,
-# add a broadcast line for each.
-
-! broadcast 60 192.168.1.255
-
 # If you want to present your computer's time for others to synchronise
 # with, even if you don't seem to be synchronised to any NTP servers
 # yourself, enable the following line.  The value 10 may be varied

examples/chrony.nm-dispatcher.dhcp

@@ -0,0 +1,43 @@
+#!/bin/sh
+# This is a NetworkManager dispatcher script for chronyd to update
+# its NTP sources passed from DHCP options. Note that this script is
+# specific to NetworkManager-dispatcher due to use of the
+# DHCP4_NTP_SERVERS environment variable.
+
+export LC_ALL=C
+
+interface=$1
+action=$2
+
+chronyc=/usr/bin/chronyc
+default_server_options=iburst
+server_dir=/var/run/chrony-dhcp
+
+dhcp_server_file=$server_dir/$interface.sources
+# DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.
+nm_dhcp_servers=$DHCP4_NTP_SERVERS
+
+add_servers_from_dhcp() {
+    rm -f "$dhcp_server_file"
+    for server in $nm_dhcp_servers; do
+        echo "server $server $default_server_options" >> "$dhcp_server_file"
+    done
+    $chronyc reload sources > /dev/null 2>&1 || :
+}
+
+clear_servers_from_dhcp() {
+    if [ -f "$dhcp_server_file" ]; then
+        rm -f "$dhcp_server_file"
+        $chronyc reload sources > /dev/null 2>&1 || :
+    fi
+}
+
+mkdir -p $server_dir
+
+if [ "$action" = "up" ] || [ "$action" = "dhcp4-change" ]; then
+    add_servers_from_dhcp
+elif [ "$action" = "down" ]; then
+    clear_servers_from_dhcp
+fi
+
+exit 0

examples/chrony.nm-dispatcher.onoffline

@@ -5,11 +5,13 @@
 
 export LC_ALL=C
 
+chronyc=/usr/bin/chronyc
+
 # For NetworkManager consider only up/down events
 [ $# -ge 2 ] && [ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
 
 # Note: for networkd-dispatcher routable.d ~= on and off.d ~= off
 
-chronyc onoffline > /dev/null 2>&1
+$chronyc onoffline > /dev/null 2>&1
 
 exit 0

hash.h

@@ -31,12 +31,25 @@
 /* length of hash values produced by SHA512 */
 #define MAX_HASH_LENGTH 64
 
-extern int HSH_GetHashId(const char *name);
+typedef enum {
+  HSH_INVALID = 0,
+  HSH_MD5 = 1,
+  HSH_SHA1 = 2,
+  HSH_SHA256 = 3,
+  HSH_SHA384 = 4,
+  HSH_SHA512 = 5,
+  HSH_SHA3_224 = 6,
+  HSH_SHA3_256 = 7,
+  HSH_SHA3_384 = 8,
+  HSH_SHA3_512 = 9,
+  HSH_TIGER = 10,
+  HSH_WHIRLPOOL = 11,
+} HSH_Algorithm;
 
-extern unsigned int HSH_Hash(int id,
+extern int HSH_GetHashId(HSH_Algorithm algorithm);
-    const unsigned char *in1, unsigned int in1_len,
+
-    const unsigned char *in2, unsigned int in2_len,
+extern int HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
-    unsigned char *out, unsigned int out_len);
+                    unsigned char *out, int out_len);
 
 extern void HSH_Finalise(void);
 

hash_intmd5.c

@@ -36,20 +36,22 @@
 static MD5_CTX ctx;
 
 int
-HSH_GetHashId(const char *name)
+HSH_GetHashId(HSH_Algorithm algorithm)
 {
   /* only MD5 is supported */
-  if (strcmp(name, "MD5"))
+  if (algorithm != HSH_MD5)
     return -1;
 
   return 0;
 }
 
-unsigned int
+int
-HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
+HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
-    const unsigned char *in2, unsigned int in2_len,
+         unsigned char *out, int out_len)
-    unsigned char *out, unsigned int out_len)
 {
+  if (in1_len < 0 || in2_len < 0 || out_len < 0)
+    return 0;
+
   MD5Init(&ctx);
   MD5Update(&ctx, in1, in1_len);
   if (in2)

hash_nettle.c

@@ -35,36 +35,36 @@
 #include "memory.h"
 
 struct hash {
-  const char *name;
+  const HSH_Algorithm algorithm;
   const char *int_name;
   const struct nettle_hash *nettle_hash;
   void *context;
 };
 
 static struct hash hashes[] = {
-  { "MD5", "md5", NULL, NULL },
+  { HSH_MD5, "md5", NULL, NULL },
-  { "SHA1", "sha1", NULL, NULL },
+  { HSH_SHA1, "sha1", NULL, NULL },
-  { "SHA256", "sha256", NULL, NULL },
+  { HSH_SHA256, "sha256", NULL, NULL },
-  { "SHA384", "sha384", NULL, NULL },
+  { HSH_SHA384, "sha384", NULL, NULL },
-  { "SHA512", "sha512", NULL, NULL },
+  { HSH_SHA512, "sha512", NULL, NULL },
-  { "SHA3-224", "sha3_224", NULL, NULL },
+  { HSH_SHA3_224, "sha3_224", NULL, NULL },
-  { "SHA3-256", "sha3_256", NULL, NULL },
+  { HSH_SHA3_256, "sha3_256", NULL, NULL },
-  { "SHA3-384", "sha3_384", NULL, NULL },
+  { HSH_SHA3_384, "sha3_384", NULL, NULL },
-  { "SHA3-512", "sha3_512", NULL, NULL },
+  { HSH_SHA3_512, "sha3_512", NULL, NULL },
-  { NULL, NULL, NULL, NULL }
+  { 0, NULL, NULL, NULL }
 };
 
 int
-HSH_GetHashId(const char *name)
+HSH_GetHashId(HSH_Algorithm algorithm)
 {
   int id, nid;
 
-  for (id = 0; hashes[id].name; id++) {
+  for (id = 0; hashes[id].algorithm != 0; id++) {
-    if (!strcmp(name, hashes[id].name))
+    if (hashes[id].algorithm == algorithm)
       break;
   }
 
-  if (!hashes[id].name)
+  if (hashes[id].algorithm == 0)
     return -1;
 
   if (hashes[id].context)
@@ -84,14 +84,16 @@ HSH_GetHashId(const char *name)
   return id;
 }
 
-unsigned int
+int
-HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
+HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
-         const unsigned char *in2, unsigned int in2_len,
+         unsigned char *out, int out_len)
-         unsigned char *out, unsigned int out_len)
 {
   const struct nettle_hash *hash;
   void *context;
 
+  if (in1_len < 0 || in2_len < 0 || out_len < 0)
+    return 0;
+
   hash = hashes[id].nettle_hash;
   context = hashes[id].context;
 
@@ -112,7 +114,7 @@ HSH_Finalise(void)
 {
   int i;
 
-  for (i = 0; hashes[i].name; i++) {
+  for (i = 0; hashes[i].algorithm != 0; i++) {
     if (hashes[i].context)
       Free(hashes[i].context);
   }

hash_nss.c

@@ -38,30 +38,30 @@ static NSSLOWInitContext *ictx;
 
 struct hash {
   HASH_HashType type;
-  const char *name;
+  HSH_Algorithm algorithm;
   NSSLOWHASHContext *context;
 };
 
 static struct hash hashes[] = {
-  { HASH_AlgMD5, "MD5", NULL },
+  { HASH_AlgMD5, HSH_MD5, NULL },
-  { HASH_AlgSHA1, "SHA1", NULL },
+  { HASH_AlgSHA1, HSH_SHA1, NULL },
-  { HASH_AlgSHA256, "SHA256", NULL },
+  { HASH_AlgSHA256, HSH_SHA256, NULL },
-  { HASH_AlgSHA384, "SHA384", NULL },
+  { HASH_AlgSHA384, HSH_SHA384, NULL },
-  { HASH_AlgSHA512, "SHA512", NULL },
+  { HASH_AlgSHA512, HSH_SHA512, NULL },
-  { 0, NULL, NULL }
+  { 0, 0, NULL }
 };
 
 int
-HSH_GetHashId(const char *name)
+HSH_GetHashId(HSH_Algorithm algorithm)
 {
   int i;
 
-  for (i = 0; hashes[i].name; i++) {
+  for (i = 0; hashes[i].algorithm != 0; i++) {
-    if (!strcmp(name, hashes[i].name))
+    if (hashes[i].algorithm == algorithm)
       break;
   }
 
-  if (!hashes[i].name)
+  if (hashes[i].algorithm == 0)
     return -1; /* not found */
 
   if (!ictx && !(ictx = NSSLOW_Init()))
@@ -74,14 +74,16 @@ HSH_GetHashId(const char *name)
   return i;
 }
 
-unsigned int
+int
-HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
+HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
-    const unsigned char *in2, unsigned int in2_len,
+         unsigned char *out, int out_len)
-    unsigned char *out, unsigned int out_len)
 {
   unsigned char buf[MAX_HASH_LENGTH];
   unsigned int ret = 0;
 
+  if (in1_len < 0 || in2_len < 0 || out_len < 0)
+    return 0;
+
   NSSLOWHASH_Begin(hashes[id].context);
   NSSLOWHASH_Update(hashes[id].context, in1, in1_len);
   if (in2)
@@ -99,7 +101,7 @@ HSH_Finalise(void)
 {
   int i;
 
-  for (i = 0; hashes[i].name; i++) {
+  for (i = 0; hashes[i].algorithm != 0; i++) {
     if (hashes[i].context)
       NSSLOWHASH_Destroy(hashes[i].context);
   }

hash_tomcrypt.c

@@ -32,51 +32,51 @@
 #include "util.h"
 
 struct hash {
-  const char *name;
+  HSH_Algorithm algorithm;
   const char *int_name;
   const struct ltc_hash_descriptor *desc;
 };
 
 static const struct hash hashes[] = {
-  { "MD5", "md5", &md5_desc },
+  { HSH_MD5, "md5", &md5_desc },
 #ifdef LTC_SHA1
-  { "SHA1", "sha1", &sha1_desc },
+  { HSH_SHA1, "sha1", &sha1_desc },
 #endif
 #ifdef LTC_SHA256
-  { "SHA256", "sha256", &sha256_desc },
+  { HSH_SHA256, "sha256", &sha256_desc },
 #endif
 #ifdef LTC_SHA384
-  { "SHA384", "sha384", &sha384_desc },
+  { HSH_SHA384, "sha384", &sha384_desc },
 #endif
 #ifdef LTC_SHA512
-  { "SHA512", "sha512", &sha512_desc },
+  { HSH_SHA512, "sha512", &sha512_desc },
 #endif
 #ifdef LTC_SHA3
-  { "SHA3-224", "sha3-224", &sha3_224_desc },
+  { HSH_SHA3_224, "sha3-224", &sha3_224_desc },
-  { "SHA3-256", "sha3-256", &sha3_256_desc },
+  { HSH_SHA3_256, "sha3-256", &sha3_256_desc },
-  { "SHA3-384", "sha3-384", &sha3_384_desc },
+  { HSH_SHA3_384, "sha3-384", &sha3_384_desc },
-  { "SHA3-512", "sha3-512", &sha3_512_desc },
+  { HSH_SHA3_512, "sha3-512", &sha3_512_desc },
 #endif
 #ifdef LTC_TIGER
-  { "TIGER", "tiger", &tiger_desc },
+  { HSH_TIGER, "tiger", &tiger_desc },
 #endif
 #ifdef LTC_WHIRLPOOL
-  { "WHIRLPOOL", "whirlpool", &whirlpool_desc },
+  { HSH_WHIRLPOOL, "whirlpool", &whirlpool_desc },
 #endif
-  { NULL, NULL, NULL }
+  { 0, NULL, NULL }
 };
 
 int
-HSH_GetHashId(const char *name)
+HSH_GetHashId(HSH_Algorithm algorithm)
 {
   int i, h;
 
-  for (i = 0; hashes[i].name; i++) {
+  for (i = 0; hashes[i].algorithm != 0; i++) {
-    if (!strcmp(name, hashes[i].name))
+    if (hashes[i].algorithm == algorithm)
       break;
   }
 
-  if (!hashes[i].name)
+  if (hashes[i].algorithm == 0)
     return -1; /* not found */
 
   h = find_hash(hashes[i].int_name);
@@ -89,15 +89,17 @@ HSH_GetHashId(const char *name)
   return find_hash(hashes[i].int_name);
 }
 
-unsigned int
+int
-HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
+HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
-    const unsigned char *in2, unsigned int in2_len,
+         unsigned char *out, int out_len)
-    unsigned char *out, unsigned int out_len)
 {
   unsigned char buf[MAX_HASH_LENGTH];
   unsigned long len;
   int r;
 
+  if (in1_len < 0 || in2_len < 0 || out_len < 0)
+    return 0;
+
   len = sizeof (buf);
   if (in2)
     r = hash_memory_multi(id, buf, &len,

keys.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2012-2016
+ * Copyright (C) Miroslav Lichvar  2012-2016, 2019-2020
  * 
  * 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
@@ -50,16 +50,16 @@ typedef enum {
 
 typedef struct {
   uint32_t id;
+  int type;
+  int length;
   KeyClass class;
   union {
     struct {
       unsigned char *value;
-      int length;
       int hash_id;
     } ntp_mac;
     CMC_Instance cmac;
   } data;
-  int auth_delay;
 } Key;
 
 static ARR_Instance keys;
@@ -121,38 +121,6 @@ get_key(unsigned int index)
   return ((Key *)ARR_GetElements(keys)) + index;
 }
 
-/* ================================================== */
-
-static int
-determine_hash_delay(uint32_t key_id)
-{
-  NTP_Packet pkt;
-  struct timespec before, after;
-  double diff, min_diff;
-  int i, nsecs;
-
-  memset(&pkt, 0, sizeof (pkt));
-
-  for (i = 0; i < 10; i++) {
-    LCL_ReadRawTime(&before);
-    KEY_GenerateAuth(key_id, (unsigned char *)&pkt, NTP_HEADER_LENGTH,
-                     (unsigned char *)&pkt + NTP_HEADER_LENGTH,
-                     sizeof (pkt) - NTP_HEADER_LENGTH);
-    LCL_ReadRawTime(&after);
-
-    diff = UTI_DiffTimespecsToDouble(&after, &before);
-
-    if (i == 0 || min_diff > diff)
-      min_diff = diff;
-  }
-
-  nsecs = 1.0e9 * min_diff;
-
-  DEBUG_LOG("authentication delay for key %"PRIu32": %d nsecs", key_id, nsecs);
-
-  return nsecs;
-}
-
 /* ================================================== */
 /* Decode key encoded in ASCII or HEX */
 
@@ -201,6 +169,8 @@ KEY_Reload(void)
   FILE *in;
   char line[2048], *key_file, *key_value;
   const char *key_type;
+  HSH_Algorithm hash_algorithm;
+  CMC_Algorithm cmac_algorithm;
   int hash_id;
   Key key;
 
@@ -238,27 +208,40 @@ KEY_Reload(void)
       continue;
     }
 
-    hash_id = HSH_GetHashId(key_type);
+    hash_algorithm = UTI_HashNameToAlgorithm(key_type);
-    cmac_key_length = CMC_GetKeyLength(key_type);
+    cmac_algorithm = UTI_CmacNameToAlgorithm(key_type);
 
-    if (hash_id >= 0) {
+    if (hash_algorithm != 0) {
+      hash_id = HSH_GetHashId(hash_algorithm);
+      if (hash_id < 0) {
+        LOG(LOGS_WARN, "Unsupported %s in key %"PRIu32, "hash function", key.id);
+        continue;
+      }
       key.class = NTP_MAC;
+      key.type = hash_algorithm;
+      key.length = key_length;
       key.data.ntp_mac.value = MallocArray(unsigned char, key_length);
       memcpy(key.data.ntp_mac.value, key_value, key_length);
-      key.data.ntp_mac.length = key_length;
       key.data.ntp_mac.hash_id = hash_id;
-    } else if (cmac_key_length > 0) {
+    } else if (cmac_algorithm != 0) {
-      if (cmac_key_length != key_length) {
+      cmac_key_length = CMC_GetKeyLength(cmac_algorithm);
+      if (cmac_key_length == 0) {
+        LOG(LOGS_WARN, "Unsupported %s in key %"PRIu32, "cipher", key.id);
+        continue;
+      } else if (cmac_key_length != key_length) {
         LOG(LOGS_WARN, "Invalid length of %s key %"PRIu32" (expected %u bits)",
             key_type, key.id, 8 * cmac_key_length);
         continue;
       }
 
       key.class = CMAC;
-      key.data.cmac = CMC_CreateInstance(key_type, (unsigned char *)key_value, key_length);
+      key.type = cmac_algorithm;
+      key.length = key_length;
+      key.data.cmac = CMC_CreateInstance(cmac_algorithm, (unsigned char *)key_value,
+                                         key_length);
       assert(key.data.cmac);
     } else {
-      LOG(LOGS_WARN, "Unknown hash function or cipher in key %"PRIu32, key.id);
+      LOG(LOGS_WARN, "Invalid type in key %"PRIu32, key.id);
       continue;
     }
 
@@ -280,9 +263,6 @@ KEY_Reload(void)
 
   /* Erase any passwords from stack */
   memset(line, 0, sizeof (line));
-
-  for (i = 0; i < ARR_GetSize(keys); i++)
-    get_key(i)->auth_delay = determine_hash_delay(get_key(i)->id);
 }
 
 /* ================================================== */
@@ -338,21 +318,6 @@ KEY_KeyKnown(uint32_t key_id)
 
 /* ================================================== */
 
-int
-KEY_GetAuthDelay(uint32_t key_id)
-{
-  Key *key;
-
-  key = get_key_by_id(key_id);
-
-  if (!key)
-    return 0;
-
-  return key->auth_delay;
-}
-
-/* ================================================== */
-
 int
 KEY_GetAuthLength(uint32_t key_id)
 {
@@ -387,24 +352,36 @@ KEY_CheckKeyLength(uint32_t key_id)
   if (!key)
     return 0;
 
-  switch (key->class) {
+  return key->length >= MIN_SECURE_KEY_LENGTH;
-    case NTP_MAC:
+}
-      return key->data.ntp_mac.length >= MIN_SECURE_KEY_LENGTH;
+
-    default:
+/* ================================================== */
-      return 1;
+
-  }
+int
+KEY_GetKeyInfo(uint32_t key_id, int *type, int *bits)
+{
+  Key *key;
+
+  key = get_key_by_id(key_id);
+
+  if (!key)
+    return 0;
+
+  *type = key->type;
+  *bits = 8 * key->length;
+
+  return 1;
 }
 
 /* ================================================== */
 
 static int
-generate_auth(Key *key, const unsigned char *data, int data_len,
+generate_auth(Key *key, const void *data, int data_len, unsigned char *auth, int auth_len)
-              unsigned char *auth, int auth_len)
 {
   switch (key->class) {
     case NTP_MAC:
       return HSH_Hash(key->data.ntp_mac.hash_id, key->data.ntp_mac.value,
-                      key->data.ntp_mac.length, data, data_len, auth, auth_len);
+                      key->length, data, data_len, auth, auth_len);
     case CMAC:
       return CMC_Hash(key->data.cmac, data, data_len, auth, auth_len);
     default:
@@ -415,7 +392,7 @@ generate_auth(Key *key, const unsigned char *data, int data_len,
 /* ================================================== */
 
 static int
-check_auth(Key *key, const unsigned char *data, int data_len,
+check_auth(Key *key, const void *data, int data_len,
            const unsigned char *auth, int auth_len, int trunc_len)
 {
   unsigned char buf[MAX_HASH_LENGTH];
@@ -429,7 +406,7 @@ check_auth(Key *key, const unsigned char *data, int data_len,
 /* ================================================== */
 
 int
-KEY_GenerateAuth(uint32_t key_id, const unsigned char *data, int data_len,
+KEY_GenerateAuth(uint32_t key_id, const void *data, int data_len,
                  unsigned char *auth, int auth_len)
 {
   Key *key;
@@ -445,7 +422,7 @@ KEY_GenerateAuth(uint32_t key_id, const unsigned char *data, int data_len,
 /* ================================================== */
 
 int
-KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
+KEY_CheckAuth(uint32_t key_id, const void *data, int data_len,
               const unsigned char *auth, int auth_len, int trunc_len)
 {
   Key *key;

keys.h

@@ -34,15 +34,14 @@ extern void KEY_Finalise(void);
 
 extern void KEY_Reload(void);
 
-extern int KEY_GetKey(uint32_t key_id, char **key, int *len);
 extern int KEY_KeyKnown(uint32_t key_id);
-extern int KEY_GetAuthDelay(uint32_t key_id);
 extern int KEY_GetAuthLength(uint32_t key_id);
 extern int KEY_CheckKeyLength(uint32_t key_id);
+extern int KEY_GetKeyInfo(uint32_t key_id, int *type, int *bits);
 
-extern int KEY_GenerateAuth(uint32_t key_id, const unsigned char *data,
+extern int KEY_GenerateAuth(uint32_t key_id, const void *data, int data_len,
-    int data_len, unsigned char *auth, int auth_len);
+                            unsigned char *auth, int auth_len);
-extern int KEY_CheckAuth(uint32_t key_id, const unsigned char *data, int data_len,
+extern int KEY_CheckAuth(uint32_t key_id, const void *data, int data_len,
                          const unsigned char *auth, int auth_len, int trunc_len);
 
 #endif /* GOT_KEYS_H */

local.c

@@ -108,8 +108,8 @@ static double max_clock_error;
 
 #define NSEC_PER_SEC 1000000000
 
-static void
+static double
-calculate_sys_precision(void)
+measure_clock_precision(void)
 {
   struct timespec ts, old_ts;
   int iters, diff, best;
@@ -135,18 +135,7 @@ calculate_sys_precision(void)
 
   assert(best > 0);
 
-  precision_quantum = 1.0e-9 * best;
+  return 1.0e-9 * best;
-
-  /* Get rounded log2 value of the measured precision */
-  precision_log = 0;
-  while (best < 707106781) {
-    precision_log--;
-    best *= 2;
-  }
-
-  assert(precision_log >= -30);
-
-  DEBUG_LOG("Clock precision %.9f (%d)", precision_quantum, precision_log);
 }
 
 /* ================================================== */
@@ -170,7 +159,16 @@ LCL_Initialise(void)
   current_freq_ppm = 0.0;
   temp_comp_ppm = 0.0;
 
-  calculate_sys_precision();
+  precision_quantum = CNF_GetClockPrecision();
+  if (precision_quantum <= 0.0)
+    precision_quantum = measure_clock_precision();
+
+  precision_quantum = CLAMP(1.0e-9, precision_quantum, 1.0);
+  precision_log = round(log(precision_quantum) / log(2.0));
+  /* NTP code doesn't support smaller log than -30 */
+  assert(precision_log >= -30);
+
+  DEBUG_LOG("Clock precision %.9f (%d)", precision_quantum, precision_log);
 
   /* This is the maximum allowed frequency offset in ppm, the time must
      never stop or run backwards */
@@ -185,13 +183,11 @@ LCL_Initialise(void)
 void
 LCL_Finalise(void)
 {
-  while (change_list.next != &change_list)
+  /* Make sure all handlers have been removed */
-    LCL_RemoveParameterChangeHandler(change_list.next->handler,
+  if (change_list.next != &change_list)
-                                     change_list.next->anything);
+    assert(0);
-
+  if (dispersion_notify_list.next != &dispersion_notify_list)
-  while (dispersion_notify_list.next != &dispersion_notify_list)
+    assert(0);
-    LCL_RemoveDispersionNotifyHandler(dispersion_notify_list.next->handler,
-                                      dispersion_notify_list.next->anything);
 }
 
 /* ================================================== */

logging.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2014, 2018
+ * Copyright (C) Miroslav Lichvar  2011-2014, 2018-2020
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -33,6 +33,7 @@
 
 #include "conf.h"
 #include "logging.h"
+#include "memory.h"
 #include "util.h"
 
 /* This is used by DEBUG_LOG macro */
@@ -61,12 +62,16 @@ static int n_filelogs = 0;
 
 static struct LogFile logfiles[MAX_FILELOGS];
 
+/* Global prefix for debug messages */
+static char *debug_prefix;
+
 /* ================================================== */
 /* Init function */
 
 void
 LOG_Initialise(void)
 {
+  debug_prefix = Strdup("");
   initialised = 1;
   LOG_OpenFileLog(NULL);
 }
@@ -85,6 +90,8 @@ LOG_Finalise(void)
 
   LOG_CycleLogFiles();
 
+  Free(debug_prefix);
+
   initialised = 0;
 }
 
@@ -132,6 +139,8 @@ void LOG_Message(LOG_Severity severity,
   time_t t;
   struct tm *tm;
 
+  assert(initialised);
+
   if (!system_log && file_log && severity >= log_min_severity) {
     /* Don't clutter up syslog with timestamps and internal debugging info */
     time(&t);
@@ -142,7 +151,7 @@ void LOG_Message(LOG_Severity severity,
     }
 #if DEBUG > 0
     if (log_min_severity <= LOGS_DEBUG)
-      fprintf(file_log, "%s:%d:(%s) ", filename, line_number, function_name);
+      fprintf(file_log, "%s%s:%d:(%s) ", debug_prefix, filename, line_number, function_name);
 #endif
   }
 
@@ -220,6 +229,23 @@ void LOG_SetMinSeverity(LOG_Severity severity)
 
 /* ================================================== */
 
+LOG_Severity
+LOG_GetMinSeverity(void)
+{
+  return log_min_severity;
+}
+
+/* ================================================== */
+
+void
+LOG_SetDebugPrefix(const char *prefix)
+{
+  Free(debug_prefix);
+  debug_prefix = Strdup(prefix);
+}
+
+/* ================================================== */
+
 void
 LOG_SetParentFd(int fd)
 {
@@ -243,7 +269,10 @@ LOG_CloseParentFd()
 LOG_FileID
 LOG_FileOpen(const char *name, const char *banner)
 {
-  assert(n_filelogs < MAX_FILELOGS);
+  if (n_filelogs >= MAX_FILELOGS) {
+    assert(0);
+    return -1;
+  }
 
   logfiles[n_filelogs].name = name;
   logfiles[n_filelogs].banner = banner;
@@ -267,7 +296,7 @@ LOG_FileWrite(LOG_FileID id, const char *format, ...)
   if (!logfiles[id].file) {
     char *logdir = CNF_GetLogDir();
 
-    if (logdir[0] == '\0') {
+    if (!logdir) {
       LOG(LOGS_WARN, "logdir not specified");
       logfiles[id].name = NULL;
       return;

logging.h

@@ -97,6 +97,12 @@ extern void LOG_Message(LOG_Severity severity, const char *format, ...);
    prefixed with the filename, line number, and function name. */
 extern void LOG_SetMinSeverity(LOG_Severity severity);
 
+/* Get the minimum severity */
+extern LOG_Severity LOG_GetMinSeverity(void);
+
+/* Set a prefix for debug messages */
+extern void LOG_SetDebugPrefix(const char *prefix);
+
 /* Log messages to a file instead of stderr, or stderr again if NULL */
 extern void LOG_OpenFileLog(const char *log_file);
 

main.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) John G. Hasler  2009
- * Copyright (C) Miroslav Lichvar  2012-2018
+ * Copyright (C) Miroslav Lichvar  2012-2020
  * 
  * 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
@@ -38,7 +38,6 @@
 #include "ntp_signd.h"
 #include "ntp_sources.h"
 #include "ntp_core.h"
-#include "nts_ke_client.h"
 #include "nts_ke_server.h"
 #include "nts_ntp_server.h"
 #include "socket.h"
@@ -91,7 +90,7 @@ delete_pidfile(void)
 {
   const char *pidfile = CNF_GetPidFile();
 
-  if (!pidfile[0])
+  if (!pidfile)
     return;
 
   if (!UTI_RemoveFile(NULL, pidfile, NULL))
@@ -105,9 +104,7 @@ MAI_CleanupAndExit(void)
 {
   if (!initialised) exit(exit_status);
   
-  if (CNF_GetDumpDir()[0] != '\0') {
+  SRC_DumpSources();
-    SRC_DumpSources();
-  }
 
   /* Don't update clock when removing sources */
   REF_SetMode(REF_ModeIgnore);
@@ -116,7 +113,6 @@ MAI_CleanupAndExit(void)
   TMC_Finalise();
   MNL_Finalise();
   CLG_Finalise();
-  NKC_Finalise();
   NKS_Finalise();
   NNS_Finalise();
   NSD_Finalise();
@@ -125,13 +121,15 @@ MAI_CleanupAndExit(void)
   NCR_Finalise();
   NIO_Finalise();
   CAM_Finalise();
-  SCK_Finalise();
+
   KEY_Finalise();
   RCL_Finalise();
   SRC_Finalise();
   REF_Finalise();
   RTC_Finalise();
   SYS_Finalise();
+
+  SCK_Finalise();
   SCH_Finalise();
   LCL_Finalise();
   PRV_Finalise();
@@ -150,7 +148,6 @@ MAI_CleanupAndExit(void)
 static void
 signal_cleanup(int x)
 {
-  if (!initialised) exit(0);
   SCH_QuitProgram();
 }
 
@@ -261,7 +258,7 @@ check_pidfile(void)
   FILE *in;
   int pid, count;
   
-  if (!pidfile[0])
+  if (!pidfile)
     return;
 
   in = UTI_OpenFile(NULL, pidfile, NULL, 'r', 0);
@@ -289,7 +286,7 @@ write_pidfile(void)
   const char *pidfile = CNF_GetPidFile();
   FILE *out;
 
-  if (!pidfile[0])
+  if (!pidfile)
     return;
 
   out = UTI_OpenFile(NULL, pidfile, NULL, 'W', 0644);
@@ -377,7 +374,7 @@ go_daemon(void)
 static void
 print_help(const char *progname)
 {
-      printf("Usage: %s [-4|-6] [-n|-d] [-q|-Q] [-r] [-R] [-s] [-t TIMEOUT] [-f FILE|COMMAND...]\n",
+      printf("Usage: %s [-4|-6] [-n|-d] [-p|-q|-Q] [-r] [-R] [-s] [-t TIMEOUT] [-f FILE|COMMAND...]\n",
              progname);
 }
 
@@ -414,7 +411,7 @@ int main
   int do_init_rtc = 0, restarted = 0, client_only = 0, timeout = -1;
   int scfilter_level = 0, lock_memory = 0, sched_priority = 0;
   int clock_control = 1, system_log = 1, log_severity = LOGS_INFO;
-  int config_args = 0;
+  int user_check = 1, config_args = 0, print_config = 0;
 
   do_platform_checks();
 
@@ -434,7 +431,7 @@ int main
   optind = 1;
 
   /* Parse short command-line options */
-  while ((opt = getopt(argc, argv, "46df:F:hl:L:mnP:qQrRst:u:vx")) != -1) {
+  while ((opt = getopt(argc, argv, "46df:F:hl:L:mnpP:qQrRst:u:Uvx")) != -1) {
     switch (opt) {
       case '4':
       case '6':
@@ -463,6 +460,12 @@ int main
       case 'n':
         nofork = 1;
         break;
+      case 'p':
+        print_config = 1;
+        user_check = 0;
+        nofork = 1;
+        system_log = 0;
+        break;
       case 'P':
         sched_priority = parse_int_arg(optarg);
         break;
@@ -476,6 +479,7 @@ int main
         ref_mode = REF_ModePrintOnce;
         nofork = 1;
         client_only = 1;
+        user_check = 0;
         clock_control = 0;
         system_log = 0;
         break;
@@ -494,6 +498,9 @@ int main
       case 'u':
         user = optarg;
         break;
+      case 'U':
+        user_check = 0;
+        break;
       case 'v':
         print_version();
         return 0;
@@ -506,7 +513,7 @@ int main
     }
   }
 
-  if (getuid() && !client_only)
+  if (user_check && getuid() != 0)
     LOG_FATAL("Not superuser");
 
   /* Turn into a daemon */
@@ -527,6 +534,8 @@ int main
   DNS_SetAddressFamily(address_family);
 
   CNF_Initialise(restarted, client_only);
+  if (print_config)
+    CNF_EnablePrint();
 
   /* Parse the config file or the remaining command line arguments */
   config_args = argc - optind;
@@ -537,6 +546,9 @@ int main
       CNF_ParseLine(NULL, config_args + optind - argc + 1, argv[optind]);
   }
 
+  if (print_config)
+    return 0;
+
   /* Check whether another chronyd may already be running */
   check_pidfile();
 
@@ -556,16 +568,20 @@ int main
   PRV_Initialise();
   LCL_Initialise();
   SCH_Initialise();
+  SCK_Initialise(address_family);
+
+  /* Start helper processes if needed */
+  NKS_PreInitialise(pw->pw_uid, pw->pw_gid, scfilter_level);
+
   SYS_Initialise(clock_control);
   RTC_Initialise(do_init_rtc);
   SRC_Initialise();
   RCL_Initialise();
   KEY_Initialise();
-  SCK_Initialise();
 
   /* Open privileged ports before dropping root */
-  CAM_Initialise(address_family);
+  CAM_Initialise();
-  NIO_Initialise(address_family);
+  NIO_Initialise();
   NCR_Initialise();
   CNF_SetupAccessRestrictions();
 
@@ -590,8 +606,7 @@ int main
   NSR_Initialise();
   NSD_Initialise();
   NNS_Initialise();
-  NKS_Initialise(scfilter_level);
+  NKS_Initialise();
-  NKC_Initialise();
   CLG_Initialise();
   MNL_Initialise();
   TMC_Initialise();

manual.c

@@ -92,6 +92,7 @@ MNL_Initialise(void)
 void
 MNL_Finalise(void)
 {
+  LCL_RemoveParameterChangeHandler(slew_samples, NULL);
 }
 
 /* ================================================== */

nameserv.c

@@ -95,6 +95,9 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
       case AF_INET6:
         if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET6)
           continue;
+        /* Don't return an address that would lose a scope ID */
+        if (((struct sockaddr_in6 *)ai->ai_addr)->sin6_scope_id != 0)
+          continue;
         ip_addrs[i].family = IPADDR_INET6;
         memcpy(&ip_addrs[i].addr.in6, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
                sizeof (ip_addrs->addr.in6));

ntp_auth.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2019
+ * Copyright (C) Miroslav Lichvar  2019-2020
  * 
  * 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
@@ -55,20 +55,29 @@ generate_symmetric_auth(uint32_t key_id, NTP_Packet *packet, NTP_PacketInfo *inf
 {
   int auth_len, max_auth_len;
 
+  if (info->length + NTP_MIN_MAC_LENGTH > sizeof (*packet)) {
+    DEBUG_LOG("Packet too long");
+    return 0;
+  }
+
   /* Truncate long MACs in NTPv4 packets to allow deterministic parsing
      of extension fields (RFC 7822) */
   max_auth_len = (info->version == 4 ? NTP_MAX_V4_MAC_LENGTH : NTP_MAX_MAC_LENGTH) - 4;
-  max_auth_len = MIN(max_auth_len, sizeof (NTP_Packet) - info->length - 4);
+  max_auth_len = MIN(max_auth_len, sizeof (*packet) - info->length - 4);
 
-  auth_len = KEY_GenerateAuth(key_id, (unsigned char *)packet, info->length,
+  auth_len = KEY_GenerateAuth(key_id, packet, info->length,
                               (unsigned char *)packet + info->length + 4, max_auth_len);
-  if (!auth_len) {
+  if (auth_len < NTP_MIN_MAC_LENGTH - 4) {
     DEBUG_LOG("Could not generate auth data with key %"PRIu32, key_id);
     return 0;
   }
 
   *(uint32_t *)((unsigned char *)packet + info->length) = htonl(key_id);
-  info->length += 4 + auth_len;
+
+  info->auth.mac.start = info->length;
+  info->auth.mac.length = 4 + auth_len;
+  info->auth.mac.key_id = key_id;
+  info->length += info->auth.mac.length;
 
   return 1;
 }
@@ -86,7 +95,7 @@ check_symmetric_auth(NTP_Packet *packet, NTP_PacketInfo *info)
   trunc_len = info->version == 4 && info->auth.mac.length <= NTP_MAX_V4_MAC_LENGTH ?
               NTP_MAX_V4_MAC_LENGTH : NTP_MAX_MAC_LENGTH;
 
-  if (!KEY_CheckAuth(info->auth.mac.key_id, (void *)packet, info->auth.mac.start,
+  if (!KEY_CheckAuth(info->auth.mac.key_id, packet, info->auth.mac.start,
                      (unsigned char *)packet + info->auth.mac.start + 4,
                      info->auth.mac.length - 4, trunc_len - 4))
     return 0;
@@ -96,31 +105,13 @@ check_symmetric_auth(NTP_Packet *packet, NTP_PacketInfo *info)
 
 /* ================================================== */
 
-static void
-adjust_timestamp(NTP_AuthMode mode, uint32_t key_id, struct timespec *ts)
-{
-  switch (mode) {
-    case NTP_AUTH_SYMMETRIC:
-      ts->tv_nsec += KEY_GetAuthDelay(key_id);
-      UTI_NormaliseTimespec(ts);
-      break;
-    case NTP_AUTH_MSSNTP:
-      ts->tv_nsec += NSD_GetAuthDelay(key_id);
-      UTI_NormaliseTimespec(ts);
-    default:
-      break;
-  }
-}
-
-/* ================================================== */
-
 static int
 is_zero_data(unsigned char *data, int length)
 {
   int i;
 
   for (i = 0; i < length; i++)
-    if (data[i])
+    if (data[i] != 0)
       return 0;
   return 1;
 }
@@ -230,14 +221,6 @@ NAU_PrepareRequestAuth(NAU_Instance instance)
 
 /* ================================================== */
 
-void
-NAU_AdjustRequestTimestamp(NAU_Instance instance, struct timespec *ts)
-{
-  adjust_timestamp(instance->mode, instance->key_id, ts);
-}
-
-/* ================================================== */
-
 int
 NAU_GenerateRequestAuth(NAU_Instance instance, NTP_Packet *request, NTP_PacketInfo *info)
 {
@@ -256,6 +239,8 @@ NAU_GenerateRequestAuth(NAU_Instance instance, NTP_Packet *request, NTP_PacketIn
       assert(0);
   }
 
+  info->auth.mode = instance->mode;
+
   return 1;
 }
 
@@ -277,6 +262,8 @@ NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info)
   if (remainder <= 0)
     return 1;
 
+  assert(remainder % 4 == 0);
+
   /* In NTPv3 and older packets don't have extension fields.  Anything after
      the header is assumed to be a MAC. */
   if (info->version <= 3) {
@@ -287,7 +274,7 @@ NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info)
 
     /* Check if it is an MS-SNTP authenticator field or extended authenticator
        field with zeroes as digest */
-    if (info->version == 3 && info->auth.mac.key_id) {
+    if (info->version == 3 && info->auth.mac.key_id != 0) {
       if (remainder == 20 && is_zero_data(data + parsed + 4, remainder - 4))
         info->auth.mode = NTP_AUTH_MSSNTP;
       else if (remainder == 72 && is_zero_data(data + parsed + 8, remainder - 8))
@@ -313,25 +300,13 @@ NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info)
     if (remainder >= NTP_MIN_MAC_LENGTH && remainder <= NTP_MAX_V4_MAC_LENGTH)
       break;
 
-    /* The NTPv4-specific limit for MAC length enables deterministic parsing of
-       packets with extension fields (RFC 7822), but we support longer MACs in
-       packets with no extension fields for compatibility with older chrony
-       clients.  Check if the longer MAC would authenticate the packet before
-       trying to parse the data as an extension field. */
-    if (parsed == NTP_HEADER_LENGTH &&
-        remainder > NTP_MAX_V4_MAC_LENGTH && remainder <= NTP_MAX_MAC_LENGTH &&
-        KEY_CheckAuth(ntohl(*(uint32_t *)(data + parsed)), data, parsed,
-                      (void *)(data + parsed + 4), remainder - 4, NTP_MAX_MAC_LENGTH - 4))
-      break;
-
     /* Check if this is a valid NTPv4 extension field and skip it */
     if (!NEF_ParseField(packet, info->length, parsed, &ef_length, &ef_type, NULL, NULL)) {
-      /* Invalid MAC or format error */
+      DEBUG_LOG("Invalid format");
-      DEBUG_LOG("Invalid format or MAC");
       return 0;
     }
 
-    assert(ef_length > 0);
+    assert(ef_length > 0 && ef_length % 4 == 0);
 
     switch (ef_type) {
       case NTP_EF_NTS_UNIQUE_IDENTIFIER:
@@ -353,9 +328,6 @@ NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info)
     /* No MAC */
     return 1;
   } else if (remainder >= NTP_MIN_MAC_LENGTH) {
-    /* This is not 100% reliable as a MAC could fail to authenticate and could
-       pass as an extension field, leaving reminder smaller than the minimum MAC
-       length */
     info->auth.mode = NTP_AUTH_SYMMETRIC;
     info->auth.mac.start = parsed;
     info->auth.mac.length = remainder;
@@ -384,6 +356,9 @@ NAU_CheckRequestAuth(NTP_Packet *request, NTP_PacketInfo *info, uint32_t *kod)
     case NTP_AUTH_MSSNTP:
       /* MS-SNTP requests are not authenticated */
       break;
+    case NTP_AUTH_MSSNTP_EXT:
+      /* Not supported yet */
+      return 0;
     case NTP_AUTH_NTS:
       if (!NNS_CheckRequestAuth(request, info, kod))
         return 0;
@@ -397,14 +372,6 @@ NAU_CheckRequestAuth(NTP_Packet *request, NTP_PacketInfo *info, uint32_t *kod)
 
 /* ================================================== */
 
-void
-NAU_AdjustResponseTimestamp(NTP_Packet *request, NTP_PacketInfo *info, struct timespec *ts)
-{
-  adjust_timestamp(info->auth.mode, info->auth.mac.key_id, ts);
-}
-
-/* ================================================== */
-
 int
 NAU_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *request_info,
                          NTP_Packet *response, NTP_PacketInfo *response_info,
@@ -434,6 +401,8 @@ NAU_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *request_info,
       return 0;
   }
 
+  response_info->auth.mode = request_info->auth.mode;
+
   return 1;
 }
 
@@ -498,3 +467,28 @@ NAU_DumpData(NAU_Instance instance)
       break;
   }
 }
+
+/* ================================================== */
+
+void
+NAU_GetReport(NAU_Instance instance, RPT_AuthReport *report)
+{
+  memset(report, 0, sizeof (*report));
+
+  report->mode = instance->mode;
+  report->last_ke_ago = -1;
+
+  switch (instance->mode) {
+    case NTP_AUTH_NONE:
+      break;
+    case NTP_AUTH_SYMMETRIC:
+      report->key_id = instance->key_id;
+      KEY_GetKeyInfo(instance->key_id, &report->key_type, &report->key_length);
+      break;
+    case NTP_AUTH_NTS:
+      NNC_GetReport(instance->nts, report);
+      break;
+    default:
+      assert(0);
+  }
+}

ntp_auth.h

@@ -29,6 +29,7 @@
 
 #include "addressing.h"
 #include "ntp.h"
+#include "reports.h"
 
 typedef struct NAU_Instance_Record *NAU_Instance;
 
@@ -50,10 +51,6 @@ extern int NAU_GetSuggestedNtpVersion(NAU_Instance instance);
 /* Perform operations necessary for NAU_GenerateRequestAuth() */
 extern int NAU_PrepareRequestAuth(NAU_Instance instance);
 
-/* Adjust a transmit timestamp for an estimated minimum time it takes to call
-   NAU_GenerateRequestAuth() */
-extern void NAU_AdjustRequestTimestamp(NAU_Instance instance, struct timespec *ts);
-
 /* Extend a request with data required by the authentication mode */
 extern int NAU_GenerateRequestAuth(NAU_Instance instance, NTP_Packet *request,
                                    NTP_PacketInfo *info);
@@ -65,11 +62,6 @@ extern int NAU_ParsePacket(NTP_Packet *packet, NTP_PacketInfo *info);
    kod code is returned, a KoD response should be sent back. */
 extern int NAU_CheckRequestAuth(NTP_Packet *request, NTP_PacketInfo *info, uint32_t *kod);
 
-/* Adjust a transmit timestamp for an estimated minimum time it takes to call
-   NAU_GenerateResponseAuth() */
-extern void NAU_AdjustResponseTimestamp(NTP_Packet *request, NTP_PacketInfo *info,
-                                        struct timespec *ts);
-
 /* Extend a response with data required by the authentication mode.  This
    function can be called only if the previous call of NAU_CheckRequestAuth()
    was on the same request. */
@@ -89,4 +81,7 @@ extern void NAU_ChangeAddress(NAU_Instance instance, IPAddr *address);
 /* Save authentication-specific data to speed up the next start */
 extern void NAU_DumpData(NAU_Instance instance);
 
+/* Provide a report about the current authentication state */
+extern void NAU_GetReport(NAU_Instance instance, RPT_AuthReport *report);
+
 #endif

ntp_core.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2018
+ * Copyright (C) Miroslav Lichvar  2009-2020
  * 
  * 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
@@ -78,6 +78,7 @@ struct NCR_Instance_Record {
   SCH_TimeoutID tx_timeout_id;  /* Timeout ID for next transmission */
   int tx_suspended;             /* Boolean indicating we can't transmit yet */
 
+  int auto_iburst;              /* If 1, initiate a burst when going online */
   int auto_burst;               /* If 1, initiate a burst on each poll */
   int auto_offline;             /* If 1, automatically go offline when requests
                                    cannot be sent */
@@ -297,6 +298,7 @@ static void transmit_timeout(void *arg);
 static double get_transmit_delay(NCR_Instance inst, int on_tx, double last_tx);
 static double get_separation(int poll);
 static int parse_packet(NTP_Packet *packet, int length, NTP_PacketInfo *info);
+static void set_connectivity(NCR_Instance inst, SRC_Connectivity connectivity);
 
 /* ================================================== */
 
@@ -555,6 +557,7 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   result->max_delay_ratio = CLAMP(0.0, params->max_delay_ratio, MAX_MAXDELAYRATIO);
   result->max_delay_dev_ratio = CLAMP(0.0, params->max_delay_dev_ratio, MAX_MAXDELAYDEVRATIO);
   result->offset_correction = params->offset;
+  result->auto_iburst = params->iburst;
   result->auto_burst = params->burst;
   result->auto_offline = params->auto_offline;
   result->poll_target = params->poll_target;
@@ -582,8 +585,8 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
 
   /* Create a source instance for this NTP source */
   result->source = SRC_CreateNewInstance(UTI_IPToRefid(&remote_addr->ip_addr),
-                                         SRC_NTP, params->sel_options,
+                                         SRC_NTP, NAU_IsAuthEnabled(result->auth),
-                                         &result->remote_addr.ip_addr,
+                                         params->sel_options, &result->remote_addr.ip_addr,
                                          params->min_samples, params->max_samples,
                                          params->min_delay, params->asymmetry);
 
@@ -596,9 +599,7 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   result->rx_timeout_id = 0;
   result->tx_timeout_id = 0;
   result->tx_suspended = 1;
-  result->opmode = params->connectivity == SRC_ONLINE ||
+  result->opmode = MD_OFFLINE;
-                   (params->connectivity == SRC_MAYBE_ONLINE &&
-                    NIO_IsServerConnectable(remote_addr)) ? MD_ONLINE : MD_OFFLINE;
   result->local_poll = result->minpoll;
   result->poll_score = 0.0;
   zero_local_timestamp(&result->local_tx);
@@ -608,9 +609,7 @@ NCR_CreateInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
   
   NCR_ResetInstance(result);
 
-  if (params->iburst) {
+  set_connectivity(result, params->connectivity);
-    NCR_InitiateSampleBurst(result, IBURST_GOOD_SAMPLES, IBURST_TOTAL_SAMPLES);
-  }
 
   return result;
 }
@@ -962,6 +961,10 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
   smooth_time = 0;
   smooth_offset = 0.0;
 
+  /* Get an initial transmit timestamp.  A more accurate timestamp will be
+     taken later in this function. */
+  SCH_GetLastEventTime(&local_transmit, NULL, NULL);
+
   if (my_mode == MODE_CLIENT) {
     /* Don't reveal local time or state of the clock in client packets */
     precision = 32;
@@ -969,10 +972,6 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     our_root_delay = our_root_dispersion = 0.0;
     UTI_ZeroTimespec(&our_ref_time);
   } else {
-    /* This is accurate enough and cheaper than calling LCL_ReadCookedTime.
-       A more accurate timestamp will be taken later in this function. */
-    SCH_GetLastEventTime(&local_transmit, NULL, NULL);
-
     REF_GetReferenceParams(&local_transmit,
                            &are_we_synchronised, &leap_status,
                            &our_stratum,
@@ -1018,12 +1017,8 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
  
   message.poll = my_poll;
   message.precision = precision;
-
-  /* If we're sending a client mode packet and we aren't synchronized yet, 
-     we might have to set up artificial values for some of these parameters */
   message.root_delay = UTI_DoubleToNtp32(our_root_delay);
   message.root_dispersion = UTI_DoubleToNtp32(our_root_dispersion);
-
   message.reference_id = htonl(our_ref_id);
 
   /* Now fill in timestamps */
@@ -1063,20 +1058,13 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     /* Prepare random bits which will be added to the transmit timestamp */
     UTI_GetNtp64Fuzz(&ts_fuzz, precision);
 
-    /* Transmit - this our local time right now!  Also, we might need to
+    /* Get a more accurate transmit timestamp if it needs to be saved in the
-       store this for our own use later, next time we receive a message
+       packet (i.e. in the server, symmetric, and broadcast basic modes) */
-       from the source we're sending to now. */
+    if (!interleaved && precision < 32) {
-    LCL_ReadCookedTime(&local_transmit, &local_transmit_err);
+      LCL_ReadCookedTime(&local_transmit, &local_transmit_err);
-
+      if (smooth_time)
-    if (smooth_time)
+        UTI_AddDoubleToTimespec(&local_transmit, smooth_offset, &local_transmit);
-      UTI_AddDoubleToTimespec(&local_transmit, smooth_offset, &local_transmit);
+    }
-
-    /* Pre-compensate the transmit time by approximately how long it will take
-       to generate the authentication data */
-    if (auth)
-      NAU_AdjustRequestTimestamp(auth, &local_transmit);
-    else
-      NAU_AdjustResponseTimestamp(request, request_info, &local_transmit);
 
     UTI_TimespecToNtp64(interleaved ? &local_tx->ts : &local_transmit,
                         &message.transmit_ts, &ts_fuzz);
@@ -1112,9 +1100,16 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
     return 0;
   }
 
+  /* If the transmit timestamp will be saved, get an even more
+     accurate daemon timestamp closer to the transmission */
+  if (local_tx)
+    LCL_ReadCookedTime(&local_transmit, &local_transmit_err);
+
   ret = NIO_SendPacket(&message, where_to, from, info.length, local_tx != NULL);
 
   if (local_tx) {
+    if (smooth_time)
+      UTI_AddDoubleToTimespec(&local_transmit, smooth_offset, &local_transmit);
     local_tx->ts = local_transmit;
     local_tx->err = local_transmit_err;
     local_tx->source = NTP_TS_DAEMON;
@@ -1796,8 +1791,8 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
           break;
       }
     } else {
-      /* Slowly increase the polling interval if we can't get good packet */
+      /* Slowly increase the polling interval if we can't get a good response */
-      adjust_poll(inst, 0.1);
+      adjust_poll(inst, testD ? 0.02 : 0.1);
     }
 
     /* If in client mode, no more packets are expected to be coming from the
@@ -2081,10 +2076,10 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
   }
 
   kod = 0;
-  log_index = CLG_LogNTPAccess(&remote_addr->ip_addr, &rx_ts->ts);
+  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_LimitNTPResponseRate(log_index)) {
+  if (log_index >= 0 && CLG_LimitServiceRate(CLG_NTP, log_index)) {
       DEBUG_LOG("NTP packet discarded to limit response rate");
       return;
   }
@@ -2096,17 +2091,10 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
     /* Don't respond unless a non-zero KoD was returned */
     if (kod == 0)
       return;
+  } else if (info.auth.mode != NTP_AUTH_NONE && info.auth.mode != NTP_AUTH_MSSNTP) {
+    CLG_LogAuthNtpRequest();
   }
 
-  /* If it is an NTPv4 packet with a long MAC and no extension fields,
-     respond with a NTPv3 packet to avoid breaking RFC 7822 and keep
-     the length symmetric.  Otherwise, respond with the same version. */
-  if (info.version == 4 && info.ext_fields == 0 && info.auth.mode == NTP_AUTH_SYMMETRIC &&
-      info.auth.mac.length > NTP_MAX_V4_MAC_LENGTH)
-    version = 3;
-  else
-    version = info.version;
-
   local_ntp_rx = local_ntp_tx = NULL;
   tx_ts = NULL;
   interleaved = 0;
@@ -2136,6 +2124,9 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
   poll = CLG_GetNtpMinPoll();
   poll = MAX(poll, message->poll);
 
+  /* Respond with the same version */
+  version = info.version;
+
   /* Send a reply */
   transmit_packet(my_mode, interleaved, poll, version, kod, NULL,
                   &message->receive_ts, &message->transmit_ts,
@@ -2255,13 +2246,9 @@ NCR_SlewTimes(NCR_Instance inst, struct timespec *when, double dfreq, double dof
 
 /* ================================================== */
 
-void
+static void
-NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity)
+set_connectivity(NCR_Instance inst, SRC_Connectivity connectivity)
 {
-  char *s;
-
-  s = UTI_IPToString(&inst->remote_addr.ip_addr);
-
   if (connectivity == SRC_MAYBE_ONLINE)
     connectivity = NIO_IsServerConnectable(&inst->remote_addr) ? SRC_ONLINE : SRC_OFFLINE;
 
@@ -2272,17 +2259,17 @@ NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity)
           /* Nothing to do */
           break;
         case MD_OFFLINE:
-          LOG(LOGS_INFO, "Source %s online", s);
           inst->opmode = MD_ONLINE;
           NCR_ResetInstance(inst);
           start_initial_timeout(inst);
+          if (inst->auto_iburst)
+            NCR_InitiateSampleBurst(inst, IBURST_GOOD_SAMPLES, IBURST_TOTAL_SAMPLES);
           break;
         case MD_BURST_WAS_ONLINE:
           /* Will revert */
           break;
         case MD_BURST_WAS_OFFLINE:
           inst->opmode = MD_BURST_WAS_ONLINE;
-          LOG(LOGS_INFO, "Source %s online", s);
           break;
         default:
           assert(0);
@@ -2291,14 +2278,12 @@ NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity)
     case SRC_OFFLINE:
       switch (inst->opmode) {
         case MD_ONLINE:
-          LOG(LOGS_INFO, "Source %s offline", s);
           take_offline(inst);
           break;
         case MD_OFFLINE:
           break;
         case MD_BURST_WAS_ONLINE:
           inst->opmode = MD_BURST_WAS_OFFLINE;
-          LOG(LOGS_INFO, "Source %s offline", s);
           break;
         case MD_BURST_WAS_OFFLINE:
           break;
@@ -2313,6 +2298,26 @@ NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity)
 
 /* ================================================== */
 
+void
+NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity)
+{
+  OperatingMode prev_opmode;
+  int was_online, is_online;
+
+  prev_opmode = inst->opmode;
+
+  set_connectivity(inst, connectivity);
+
+  /* Report an important change */
+  was_online = prev_opmode == MD_ONLINE || prev_opmode == MD_BURST_WAS_ONLINE;
+  is_online = inst->opmode == MD_ONLINE || inst->opmode == MD_BURST_WAS_ONLINE;
+  if (was_online != is_online)
+    LOG(LOGS_INFO, "Source %s %s",
+        UTI_IPToString(&inst->remote_addr.ip_addr), is_online ? "online" : "offline");
+}
+
+/* ================================================== */
+
 void
 NCR_ModifyMinpoll(NCR_Instance inst, int new_minpoll)
 {
@@ -2444,6 +2449,14 @@ NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timespec *n
 
 /* ================================================== */
 
+void
+NCR_GetAuthReport(NCR_Instance inst, RPT_AuthReport *report)
+{
+  NAU_GetReport(inst->auth, report);
+}
+
+/* ================================================== */
+
 void
 NCR_GetNTPReport(NCR_Instance inst, RPT_NTPReport *report)
 {
@@ -2596,14 +2609,13 @@ broadcast_timeout(void *arg)
 /* ================================================== */
 
 void
-NCR_AddBroadcastDestination(IPAddr *addr, unsigned short port, int interval)
+NCR_AddBroadcastDestination(NTP_Remote_Address *addr, int interval)
 {
   BroadcastDestination *destination;
 
   destination = (BroadcastDestination *)ARR_GetNewElement(broadcasts);
 
-  destination->addr.ip_addr = *addr;
+  destination->addr = *addr;
-  destination->addr.port = port;
   destination->local_addr.ip_addr.family = IPADDR_UNSPEC;
   destination->local_addr.if_index = INVALID_IF_INDEX;
   destination->local_addr.sock_fd = NIO_OpenServerSocket(&destination->addr);

ntp_core.h

@@ -122,6 +122,7 @@ extern void NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target);
 extern void NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_samples);
 
 extern void NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timespec *now);
+extern void NCR_GetAuthReport(NCR_Instance inst, RPT_AuthReport *report);
 extern void NCR_GetNTPReport(NCR_Instance inst, RPT_NTPReport *report);
 
 extern int NCR_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all);
@@ -138,6 +139,6 @@ extern int NCR_IsSyncPeer(NCR_Instance instance);
 
 extern void NCR_DumpAuthData(NCR_Instance inst);
 
-extern void NCR_AddBroadcastDestination(IPAddr *addr, unsigned short port, int interval);
+extern void NCR_AddBroadcastDestination(NTP_Remote_Address *addr, int interval);
 
 #endif /* GOT_NTP_CORE_H */

ntp_ext.c

@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2019
+ * Copyright (C) Miroslav Lichvar  2019-2020
  * 
  * 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

ntp_io.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Timo Teras  2009
- * Copyright (C) Miroslav Lichvar  2009, 2013-2016, 2018
+ * Copyright (C) Miroslav Lichvar  2009, 2013-2016, 2018-2020
  * 
  * 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
@@ -83,19 +83,20 @@ static void read_from_socket(int sock_fd, int event, void *anything);
 static int
 open_socket(int family, int local_port, int client_only, IPSockAddr *remote_addr)
 {
-  int sock_fd, sock_flags, events = SCH_FILE_INPUT;
+  int sock_fd, sock_flags, dscp, events = SCH_FILE_INPUT;
   IPSockAddr local_addr;
+  char *iface;
 
-  if (!SCK_IsFamilySupported(family))
+  if (!SCK_IsIpFamilyEnabled(family))
     return INVALID_SOCK_FD;
 
-  if (!client_only)
+  if (!client_only) {
     CNF_GetBindAddress(family, &local_addr.ip_addr);
-  else
+    iface = CNF_GetBindNtpInterface();
+  } else {
     CNF_GetBindAcquisitionAddress(family, &local_addr.ip_addr);
-
+    iface = CNF_GetBindAcquisitionInterface();
-  if (local_addr.ip_addr.family != family)
+  }
-    SCK_GetAnyLocalIPAddress(family, &local_addr.ip_addr);
 
   local_addr.port = local_port;
 
@@ -103,13 +104,21 @@ open_socket(int family, int local_port, int client_only, IPSockAddr *remote_addr
   if (!client_only)
     sock_flags |= SCK_FLAG_BROADCAST;
 
-  sock_fd = SCK_OpenUdpSocket(remote_addr, &local_addr, sock_flags);
+  sock_fd = SCK_OpenUdpSocket(remote_addr, &local_addr, iface, sock_flags);
   if (sock_fd < 0) {
     if (!client_only)
       LOG(LOGS_ERR, "Could not open NTP socket on %s", UTI_IPSockAddrToString(&local_addr));
     return INVALID_SOCK_FD;
   }
 
+  dscp = CNF_GetNtpDscp();
+  if (dscp > 0 && dscp < 64) {
+#ifdef IP_TOS
+    if (!SCK_SetIntOption(sock_fd, IPPROTO_IP, IP_TOS, dscp << 2))
+      ;
+#endif
+  }
+
   if (!client_only && family == IPADDR_INET4 && local_addr.port > 0)
     bound_server_sock_fd4 = local_addr.ip_addr.addr.in4 != INADDR_ANY;
 
@@ -152,7 +161,7 @@ close_socket(int sock_fd)
 /* ================================================== */
 
 void
-NIO_Initialise(int family)
+NIO_Initialise(void)
 {
   int server_port, client_port;
 
@@ -191,25 +200,18 @@ NIO_Initialise(int family)
   server_sock_ref4 = 0;
   server_sock_ref6 = 0;
 
-  if (family == IPADDR_UNSPEC || family == IPADDR_INET4) {
+  if (permanent_server_sockets && server_port) {
-    if (permanent_server_sockets && server_port)
+    server_sock_fd4 = open_socket(IPADDR_INET4, server_port, 0, NULL);
-      server_sock_fd4 = open_socket(IPADDR_INET4, server_port, 0, NULL);
+    server_sock_fd6 = open_socket(IPADDR_INET6, server_port, 0, NULL);
-    if (!separate_client_sockets) {
-      if (client_port != server_port || !server_port)
-        client_sock_fd4 = open_socket(IPADDR_INET4, client_port, 1, NULL);
-      else
-        client_sock_fd4 = server_sock_fd4;
-    }
   }
 
-  if (family == IPADDR_UNSPEC || family == IPADDR_INET6) {
+  if (!separate_client_sockets) {
-    if (permanent_server_sockets && server_port)
+    if (client_port != server_port || !server_port) {
-      server_sock_fd6 = open_socket(IPADDR_INET6, server_port, 0, NULL);
+      client_sock_fd4 = open_socket(IPADDR_INET4, client_port, 1, NULL);
-    if (!separate_client_sockets) {
+      client_sock_fd6 = open_socket(IPADDR_INET6, client_port, 1, NULL);
-      if (client_port != server_port || !server_port)
+    } else {
-        client_sock_fd6 = open_socket(IPADDR_INET6, client_port, 1, NULL);
+      client_sock_fd4 = server_sock_fd4;
-      else
+      client_sock_fd6 = server_sock_fd6;
-        client_sock_fd6 = server_sock_fd6;
     }
   }
 
@@ -455,9 +457,13 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
     message.remote_addr.ip.port = remote_addr->port;
   }
 
-  message.if_index = local_addr->if_index;
   message.local_addr.ip = local_addr->ip_addr;
 
+  /* Don't require responses to non-link-local addresses to use the same
+     interface */
+  message.if_index = SCK_IsLinkLocalIPAddress(&message.remote_addr.ip.ip_addr) ?
+                       local_addr->if_index : INVALID_IF_INDEX;
+
 #if !defined(HAVE_IN_PKTINFO) && defined(IP_SENDSRCADDR)
   /* On FreeBSD a local IPv4 address cannot be specified on bound socket */
   if (message.local_addr.ip.family == IPADDR_INET4 &&

ntp_io.h

@@ -33,7 +33,7 @@
 #include "addressing.h"
 
 /* Function to initialise the module. */
-extern void NIO_Initialise(int family);
+extern void NIO_Initialise(void);
 
 /* Function to finalise the module */
 extern void NIO_Finalise(void);

ntp_io_linux.c

@@ -125,7 +125,7 @@ add_interface(CNF_HwTsInterface *conf_iface)
       return 1;
   }
 
-  sock_fd = SCK_OpenUdpSocket(NULL, NULL, 0);
+  sock_fd = SCK_OpenUdpSocket(NULL, NULL, NULL, 0);
   if (sock_fd < 0)
     return 0;
 
@@ -200,7 +200,8 @@ add_interface(CNF_HwTsInterface *conf_iface)
   req.ifr_data = (char *)&ts_config;
 
   if (ioctl(sock_fd, SIOCSHWTSTAMP, &req)) {
-    DEBUG_LOG("ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
+    LOG(errno == EPERM ? LOGS_ERR : LOGS_DEBUG,
+        "ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
 
     /* Check the current timestamping configuration in case this interface
        allows only reading of the configuration and it was already configured
@@ -285,7 +286,7 @@ update_interface_speed(struct Interface *iface)
   struct ifreq req;
   int sock_fd, link_speed;
 
-  sock_fd = SCK_OpenUdpSocket(NULL, NULL, 0);
+  sock_fd = SCK_OpenUdpSocket(NULL, NULL, NULL, 0);
   if (sock_fd < 0)
     return;
 
@@ -320,7 +321,7 @@ check_timestamping_option(int option)
 {
   int sock_fd;
 
-  sock_fd = SCK_OpenUdpSocket(NULL, NULL, 0);
+  sock_fd = SCK_OpenUdpSocket(NULL, NULL, NULL, 0);
   if (sock_fd < 0)
     return 0;
 
@@ -341,7 +342,7 @@ open_dummy_socket(void)
 {
   int sock_fd, events = 0;
 
-  sock_fd = SCK_OpenUdpSocket(NULL, NULL, 0);
+  sock_fd = SCK_OpenUdpSocket(NULL, NULL, NULL, 0);
   if (sock_fd < 0)
     return INVALID_SOCK_FD;
 
@@ -757,7 +758,7 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
   l2_length = message->length;
   message->length = extract_udp_data(message->data, &message->remote_addr.ip, message->length);
 
-  DEBUG_LOG("Extracted message for %s fd=%d len=%u",
+  DEBUG_LOG("Extracted message for %s fd=%d len=%d",
             UTI_IPSockAddrToString(&message->remote_addr.ip),
             local_addr->sock_fd, message->length);
 

ntp_signd.c

@@ -96,14 +96,6 @@ static unsigned int queue_tail;
 /* Unix domain socket connected to ntp_signd */
 static int sock_fd;
 
-#define MIN_AUTH_DELAY 1.0e-5
-#define MAX_AUTH_DELAY 1.0e-2
-
-/* Average time needed for signing one packet.  This is used to adjust the
-   transmit timestamp in NTP packets.  The timestamp won't be very accurate as
-   the delay is variable, but it should be good enough for MS-SNTP clients. */
-static double auth_delay;
-
 /* Flag indicating if the MS-SNTP authentication is enabled */
 static int enabled;
 
@@ -183,10 +175,6 @@ process_response(SignInstance *inst)
   NIO_SendPacket(&inst->response.signed_packet, &inst->remote_addr, &inst->local_addr,
                  ntohl(inst->response.length) + sizeof (inst->response.length) -
                  offsetof(SigndResponse, signed_packet), 0);
-
-  /* Update exponential moving average of the authentication delay */
-  delay = CLAMP(MIN_AUTH_DELAY, delay, MAX_AUTH_DELAY);
-  auth_delay += 0.1 * (delay - auth_delay);
 }
 
 /* ================================================== */
@@ -274,7 +262,6 @@ void
 NSD_Initialise()
 {
   sock_fd = INVALID_SOCK_FD;
-  auth_delay = MIN_AUTH_DELAY;
   enabled = CNF_GetNtpSigndSocket() && CNF_GetNtpSigndSocket()[0];
 
   if (!enabled)
@@ -301,13 +288,6 @@ NSD_Finalise()
 
 /* ================================================== */
 
-extern int NSD_GetAuthDelay(uint32_t key_id)
-{
-  return 1.0e9 * auth_delay;
-}
-
-/* ================================================== */
-
 int
 NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_PacketInfo *info,
                       NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)

ntp_signd.h

@@ -35,9 +35,6 @@ extern void NSD_Initialise(void);
 /* Finalisation function */
 extern void NSD_Finalise(void);
 
-/* Function to get an estimate of delay due to signing */
-extern int NSD_GetAuthDelay(uint32_t key_id);
-
 /* Function to sign an NTP packet and send it */
 extern int NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_PacketInfo *info,
                                  NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr);

ntp_sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016
+ * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020
  * 
  * 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
@@ -54,10 +54,12 @@ typedef struct {
                                       is not resolved yet) */
   NCR_Instance data;            /* Data for the protocol engine for this source */
   char *name;                   /* Name of the source, may be NULL */
-  int pool;                     /* Number of the pool from which was this source
+  int pool_id;                  /* ID of the pool from which was this source
                                    added or INVALID_POOL */
   int tentative;                /* Flag indicating there was no valid response
                                    received from the source yet */
+  uint32_t conf_id;             /* Configuration ID, which can be shared with
+                                   different sources in case of a pool */
 } SourceRecord;
 
 /* Hash table of SourceRecord, its size is a power of two and it's never
@@ -73,13 +75,16 @@ static int auto_start_sources = 0;
 /* Last assigned address ID */
 static uint32_t last_address_id = 0;
 
+/* Last assigned configuration ID */
+static uint32_t last_conf_id = 0;
+
 /* Source scheduled for name resolving (first resolving or replacement) */
 struct UnresolvedSource {
-  /* Current address of the source (IDADDR_ID is used for a single source
+  /* Current address of the source (IPADDR_ID is used for a single source
-     with unknown address and IPADDR_UNSPEC for a pool of sources */
+     with unknown address and IPADDR_UNSPEC for a pool of sources) */
   NTP_Remote_Address address;
   /* ID of the pool if not a single source */
-  int pool;
+  int pool_id;
   /* Name to be resolved */
   char *name;
   /* Flag indicating addresses should be used in a random order */
@@ -114,7 +119,7 @@ struct SourcePool {
   int max_sources;
 };
 
-/* Array of SourcePool */
+/* Array of SourcePool (indexed by their ID) */
 static ARR_Instance pools;
 
 /* ================================================== */
@@ -123,7 +128,7 @@ static ARR_Instance pools;
 static void resolve_sources(void);
 static void rehash_records(void);
 static void clean_source_record(SourceRecord *record);
-static void remove_pool_sources(int pool, int tentative, int unresolved);
+static void remove_pool_sources(int pool_id, int tentative, int unresolved);
 static void remove_unresolved_source(struct UnresolvedSource *us);
 
 static void
@@ -185,6 +190,8 @@ NSR_Finalise(void)
       clean_source_record(record);
   }
 
+  LCL_RemoveParameterChangeHandler(slew_sources, NULL);
+
   ARR_DestroyInstance(records);
   ARR_DestroyInstance(pools);
 
@@ -195,39 +202,30 @@ NSR_Finalise(void)
 }
 
 /* ================================================== */
-/* Return slot number and whether the IP address was matched or not.
+/* Find a slot matching an IP address.  It is assumed that there can
-   found = 0 => Neither IP nor port matched, empty slot returned
+   only ever be one record for a particular IP address. */
-   found = 1 => Only IP matched, port doesn't match
-   found = 2 => Both IP and port matched.
 
-   It is assumed that there can only ever be one record for a
+static int
-   particular IP address.  (If a different port comes up, it probably
+find_slot(IPAddr *ip_addr, int *slot)
-   means someone is running ntpdate -d or something).  Thus, if we
-   match the IP address we stop the search regardless of whether the
-   port number matches.
-
-  */
-
-static void
-find_slot(NTP_Remote_Address *remote_addr, int *slot, int *found)
 {
   SourceRecord *record;
   uint32_t hash;
   unsigned int i, size;
-  unsigned short port;
 
   size = ARR_GetSize(records);
 
   *slot = 0;
-  *found = 0;
   
-  if (remote_addr->ip_addr.family != IPADDR_INET4 &&
+  switch (ip_addr->family) {
-      remote_addr->ip_addr.family != IPADDR_INET6 &&
+    case IPADDR_INET4:
-      remote_addr->ip_addr.family != IPADDR_ID)
+    case IPADDR_INET6:
-    return;
+    case IPADDR_ID:
+      break;
+    default:
+      return 0;
+  }
 
-  hash = UTI_IPToHash(&remote_addr->ip_addr);
+  hash = UTI_IPToHash(ip_addr);
-  port = remote_addr->port;
 
   for (i = 0; i < size / 2; i++) {
     /* Use quadratic probing */
@@ -237,12 +235,26 @@ find_slot(NTP_Remote_Address *remote_addr, int *slot, int *found)
     if (!record->remote_addr)
       break;
 
-    if (!UTI_CompareIPs(&record->remote_addr->ip_addr,
+    if (UTI_CompareIPs(&record->remote_addr->ip_addr, ip_addr, NULL) == 0)
-                        &remote_addr->ip_addr, NULL)) {
+      return 1;
-      *found = record->remote_addr->port == port ? 2 : 1;
-      return;
-    }
   }
+
+  return 0;
+}
+
+/* ================================================== */
+/* Find a slot matching an IP address and port. The function returns:
+   0 => IP not matched, empty slot returned if a valid address was provided
+   1 => Only IP matched, port doesn't match
+   2 => Both IP and port matched. */
+
+static int
+find_slot2(NTP_Remote_Address *remote_addr, int *slot)
+{
+  if (!find_slot(&remote_addr->ip_addr, slot))
+    return 0;
+
+  return get_record(*slot)->remote_addr->port == remote_addr->port ? 2 : 1;
 }
 
 /* ================================================== */
@@ -261,7 +273,7 @@ rehash_records(void)
 {
   SourceRecord *temp_records;
   unsigned int i, old_size, new_size;
-  int slot, found;
+  int slot;
 
   old_size = ARR_GetSize(records);
 
@@ -281,8 +293,8 @@ rehash_records(void)
     if (!temp_records[i].remote_addr)
       continue;
 
-    find_slot(temp_records[i].remote_addr, &slot, &found);
+    if (find_slot2(temp_records[i].remote_addr, &slot) != 0)
-    assert(!found);
+      assert(0);
 
     *get_record(slot) = temp_records[i];
   }
@@ -294,16 +306,16 @@ rehash_records(void)
 
 /* Procedure to add a new source */
 static NSR_Status
-add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type, SourceParameters *params, int pool)
+add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
+           SourceParameters *params, int pool_id, uint32_t conf_id)
 {
   SourceRecord *record;
-  int slot, found;
+  int slot;
 
   assert(initialised);
 
   /* Find empty bin & check that we don't have the address already */
-  find_slot(remote_addr, &slot, &found);
+  if (find_slot2(remote_addr, &slot) != 0) {
-  if (found) {
     return NSR_AlreadyInUse;
   } else {
     if (remote_addr->ip_addr.family != IPADDR_INET4 &&
@@ -315,21 +327,22 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type, So
 
       if (!check_hashtable_size(n_sources, ARR_GetSize(records))) {
         rehash_records();
-        find_slot(remote_addr, &slot, &found);
+        if (find_slot2(remote_addr, &slot) != 0)
+          assert(0);
       }
 
-      assert(!found);
       record = get_record(slot);
       record->data = NCR_CreateInstance(remote_addr, type, params, name);
       record->remote_addr = NCR_GetRemoteAddress(record->data);
       record->name = name ? Strdup(name) : NULL;
-      record->pool = pool;
+      record->pool_id = pool_id;
       record->tentative = 1;
+      record->conf_id = conf_id;
 
-      if (record->pool != INVALID_POOL) {
+      if (record->pool_id != INVALID_POOL) {
-        get_pool(record->pool)->sources++;
+        get_pool(record->pool_id)->sources++;
         if (!UTI_IsIPReal(&remote_addr->ip_addr))
-          get_pool(record->pool)->unresolved_sources++;
+          get_pool(record->pool_id)->unresolved_sources++;
       }
 
       if (auto_start_sources && UTI_IsIPReal(&remote_addr->ip_addr))
@@ -351,13 +364,13 @@ change_source_address(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr
   LOG_Severity severity;
   char *name;
 
-  find_slot(old_addr, &slot1, &found);
+  found = find_slot2(old_addr, &slot1);
-  if (!found)
+  if (found == 0)
     return NSR_NoSuchSource;
 
   /* Make sure there is no other source using the new address (with the same
      or different port), but allow a source to have its port changed */
-  find_slot(new_addr, &slot2, &found);
+  found = find_slot2(new_addr, &slot2);
   if (found == 2 || (found != 0 && slot1 != slot2))
     return NSR_AlreadyInUse;
 
@@ -367,15 +380,15 @@ change_source_address(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr
   if (!UTI_IsIPReal(&old_addr->ip_addr) && UTI_IsIPReal(&new_addr->ip_addr)) {
     if (auto_start_sources)
       NCR_StartInstance(record->data);
-    if (record->pool != INVALID_POOL)
+    if (record->pool_id != INVALID_POOL)
-      get_pool(record->pool)->unresolved_sources--;
+      get_pool(record->pool_id)->unresolved_sources--;
   }
 
   if (!record->tentative) {
     record->tentative = 1;
 
-    if (record->pool != INVALID_POOL)
+    if (record->pool_id != INVALID_POOL)
-      get_pool(record->pool)->confirmed_sources--;
+      get_pool(record->pool_id)->confirmed_sources--;
   }
 
   name = record->name;
@@ -430,12 +443,12 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
 
     DEBUG_LOG("(%d) %s", i + 1, UTI_IPToString(&new_addr.ip_addr));
 
-    if (us->pool != INVALID_POOL) {
+    if (us->pool_id != INVALID_POOL) {
       /* In the pool resolving mode, try to replace all sources from
          the pool which don't have a real address yet */
       for (j = 0; j < ARR_GetSize(records); j++) {
         record = get_record(j);
-        if (!record->remote_addr || record->pool != us->pool ||
+        if (!record->remote_addr || record->pool_id != us->pool_id ||
             UTI_IsIPReal(&record->remote_addr->ip_addr))
           continue;
         old_addr = *record->remote_addr;
@@ -456,15 +469,14 @@ process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs
 static int
 is_resolved(struct UnresolvedSource *us)
 {
-  int slot, found;
+  int slot;
 
-  if (us->pool != INVALID_POOL) {
+  if (us->pool_id != INVALID_POOL) {
-    return get_pool(us->pool)->unresolved_sources <= 0;
+    return get_pool(us->pool_id)->unresolved_sources <= 0;
   } else {
     /* If the address is no longer present, it was removed or replaced
        (i.e. resolved) */
-    find_slot(&us->address, &slot, &found);
+    return find_slot2(&us->address, &slot) == 0;
-    return !found;
   }
 }
 
@@ -597,27 +609,64 @@ remove_unresolved_source(struct UnresolvedSource *us)
 
 /* ================================================== */
 
-NSR_Status
+static int get_unused_pool_id(void)
-NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params)
 {
-  return add_source(remote_addr, NULL, type, params, INVALID_POOL);
+  struct UnresolvedSource *us;
+  int i;
+
+  for (i = 0; i < ARR_GetSize(pools); i++) {
+    if (get_pool(i)->sources > 0)
+      continue;
+
+    /* Make sure there is no name waiting to be resolved using this pool */
+    for (us = unresolved_sources; us; us = us->next) {
+      if (us->pool_id == i)
+        break;
+    }
+    if (us)
+      continue;
+
+    return i;
+  }
+
+  return INVALID_POOL;
 }
 
 /* ================================================== */
 
 NSR_Status
-NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, SourceParameters *params)
+NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
+              SourceParameters *params, uint32_t *conf_id)
+{
+  NSR_Status s;
+
+  s = add_source(remote_addr, NULL, type, params, INVALID_POOL, last_conf_id + 1);
+  if (s != NSR_Success)
+    return s;
+
+  last_conf_id++;
+  if (conf_id)
+    *conf_id = last_conf_id;
+
+  return s;
+}
+
+/* ================================================== */
+
+NSR_Status
+NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
+                    SourceParameters *params, uint32_t *conf_id)
 {
   struct UnresolvedSource *us;
   struct SourcePool *sp;
   NTP_Remote_Address remote_addr;
-  int i, new_sources;
+  int i, new_sources, pool_id;
 
   /* If the name is an IP address, don't bother with full resolving now
      or later when trying to replace the source */
   if (UTI_StringToIP(name, &remote_addr.ip_addr)) {
     remote_addr.port = port;
-    return NSR_AddSource(&remote_addr, type, params);
+    return NSR_AddSource(&remote_addr, type, params, conf_id);
   }
 
   /* Make sure the name is at least printable and has no spaces */
@@ -635,26 +684,37 @@ NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, Source
   remote_addr.port = port;
 
   if (!pool) {
-    us->pool = INVALID_POOL;
+    us->pool_id = INVALID_POOL;
     us->address = remote_addr;
     new_sources = 1;
   } else {
-    sp = (struct SourcePool *)ARR_GetNewElement(pools);
+    pool_id = get_unused_pool_id();
+    if (pool_id != INVALID_POOL) {
+      sp = get_pool(pool_id);
+    } else {
+      sp = ARR_GetNewElement(pools);
+      pool_id = ARR_GetSize(pools) - 1;
+    }
+
     sp->sources = 0;
     sp->unresolved_sources = 0;
     sp->confirmed_sources = 0;
     sp->max_sources = CLAMP(1, params->max_sources, MAX_POOL_SOURCES);
-    us->pool = ARR_GetSize(pools) - 1;
+    us->pool_id = pool_id;
     us->address.ip_addr.family = IPADDR_UNSPEC;
     new_sources = MIN(2 * sp->max_sources, MAX_POOL_SOURCES);
   }
 
   append_unresolved_source(us);
 
+  last_conf_id++;
+  if (conf_id)
+    *conf_id = last_conf_id;
+
   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) != NSR_Success)
+    if (add_source(&remote_addr, name, type, params, us->pool_id, last_conf_id) != NSR_Success)
       return NSR_TooManySources;
   }
 
@@ -721,8 +781,8 @@ clean_source_record(SourceRecord *record)
 {
   assert(record->remote_addr);
 
-  if (record->pool != INVALID_POOL) {
+  if (record->pool_id != INVALID_POOL) {
-    struct SourcePool *pool = get_pool(record->pool);
+    struct SourcePool *pool = get_pool(record->pool_id);
 
     pool->sources--;
     if (!UTI_IsIPReal(&record->remote_addr->ip_addr))
@@ -745,19 +805,16 @@ clean_source_record(SourceRecord *record)
 
 /* Procedure to remove a source.  We don't bother whether the port
    address is matched - we're only interested in removing a record for
-   the right IP address.  Thus the caller can specify the port number
+   the right IP address. */
-   as zero if it wishes. */
 NSR_Status
-NSR_RemoveSource(NTP_Remote_Address *remote_addr)
+NSR_RemoveSource(IPAddr *address)
 {
-  int slot, found;
+  int slot;
 
   assert(initialised);
 
-  find_slot(remote_addr, &slot, &found);
+  if (find_slot(address, &slot) == 0)
-  if (!found) {
     return NSR_NoSuchSource;
-  }
 
   clean_source_record(get_record(slot));
 
@@ -771,6 +828,24 @@ NSR_RemoveSource(NTP_Remote_Address *remote_addr)
 
 /* ================================================== */
 
+void
+NSR_RemoveSourcesById(uint32_t conf_id)
+{
+  SourceRecord *record;
+  unsigned int i;
+
+  for (i = 0; i < ARR_GetSize(records); i++) {
+    record = get_record(i);
+    if (!record->remote_addr || record->conf_id != conf_id)
+      continue;
+    clean_source_record(record);
+  }
+
+  rehash_records();
+}
+
+/* ================================================== */
+
 void
 NSR_RemoveAllSources(void)
 {
@@ -803,7 +878,7 @@ resolve_source_replacement(SourceRecord *record)
      stuck to a pair of addresses if the order doesn't change, or a group of
      IPv4/IPv6 addresses if the resolver prefers inaccessible IP family */
   us->random_order = record->tentative;
-  us->pool = INVALID_POOL;
+  us->pool_id = INVALID_POOL;
   us->address = *record->remote_addr;
 
   append_unresolved_source(us);
@@ -817,16 +892,11 @@ NSR_HandleBadSource(IPAddr *address)
 {
   static struct timespec last_replacement;
   struct timespec now;
-  NTP_Remote_Address remote_addr;
   SourceRecord *record;
-  int slot, found;
   double diff;
+  int slot;
 
-  remote_addr.ip_addr = *address;
+  if (!find_slot(address, &slot))
-  remote_addr.port = 0;
-
-  find_slot(&remote_addr, &slot, &found);
-  if (!found)
     return;
 
   record = get_record(slot);
@@ -877,7 +947,7 @@ NSR_UpdateSourceNtpAddress(NTP_Remote_Address *old_addr, NTP_Remote_Address *new
 
 /* ================================================== */
 
-static void remove_pool_sources(int pool, int tentative, int unresolved)
+static void remove_pool_sources(int pool_id, int tentative, int unresolved)
 {
   SourceRecord *record;
   unsigned int i, removed;
@@ -885,7 +955,7 @@ static void remove_pool_sources(int pool, int tentative, int unresolved)
   for (i = removed = 0; i < ARR_GetSize(records); i++) {
     record = get_record(i);
 
-    if (!record->remote_addr || record->pool != pool)
+    if (!record->remote_addr || record->pool_id != pool_id)
       continue;
 
     if ((tentative && !record->tentative) ||
@@ -908,14 +978,9 @@ static void remove_pool_sources(int pool, int tentative, int unresolved)
 uint32_t
 NSR_GetLocalRefid(IPAddr *address)
 {
-  NTP_Remote_Address remote_addr;
+  int slot;
-  int slot, found;
 
-  remote_addr.ip_addr = *address;
+  if (!find_slot(address, &slot))
-  remote_addr.port = 0;
-
-  find_slot(&remote_addr, &slot, &found);
-  if (!found)
     return 0;
 
   return NCR_GetLocalRefid(get_record(slot)->data);
@@ -926,16 +991,11 @@ NSR_GetLocalRefid(IPAddr *address)
 char *
 NSR_GetName(IPAddr *address)
 {
-  NTP_Remote_Address remote_addr;
-  int slot, found;
   SourceRecord *record;
+  int slot;
 
-  remote_addr.ip_addr = *address;
+  if (!find_slot(address, &slot))
-  remote_addr.port = 0;
+    return 0;
-
-  find_slot(&remote_addr, &slot, &found);
-  if (!found)
-    return NULL;
 
   record = get_record(slot);
   if (record->name)
@@ -954,12 +1014,12 @@ NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
 {
   SourceRecord *record;
   struct SourcePool *pool;
-  int slot, found;
+  int slot;
 
   assert(initialised);
 
-  find_slot(remote_addr, &slot, &found);
+  /* Must match IP address AND port number */
-  if (found == 2) { /* Must match IP address AND port number */
+  if (find_slot2(remote_addr, &slot) == 2) {
     record = get_record(slot);
 
     if (!NCR_ProcessRxKnown(record->data, local_addr, rx_ts, message, length))
@@ -969,8 +1029,8 @@ NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
       /* This was the first good reply from the source */
       record->tentative = 0;
 
-      if (record->pool != INVALID_POOL) {
+      if (record->pool_id != INVALID_POOL) {
-        pool = get_pool(record->pool);
+        pool = get_pool(record->pool_id);
         pool->confirmed_sources++;
 
         DEBUG_LOG("pool %s has %d confirmed sources", record->name, pool->confirmed_sources);
@@ -978,7 +1038,7 @@ NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
         /* If the number of sources from the pool reached the configured
            maximum, remove the remaining tentative sources */
         if (pool->confirmed_sources >= pool->max_sources)
-          remove_pool_sources(record->pool, 1, 0);
+          remove_pool_sources(record->pool_id, 1, 0);
       }
     }
   } else {
@@ -993,11 +1053,10 @@ NSR_ProcessTx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
               NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length)
 {
   SourceRecord *record;
-  int slot, found;
+  int slot;
 
-  find_slot(remote_addr, &slot, &found);
+  /* Must match IP address AND port number */
-
+  if (find_slot2(remote_addr, &slot) == 2) {
-  if (found == 2) { /* Must match IP address AND port number */
     record = get_record(slot);
     NCR_ProcessTxKnown(record->data, local_addr, tx_ts, message, length);
   } else {
@@ -1074,18 +1133,13 @@ NSR_SetConnectivity(IPAddr *mask, IPAddr *address, SRC_Connectivity connectivity
 int
 NSR_ModifyMinpoll(IPAddr *address, int new_minpoll)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMinpoll(get_record(slot)->data, new_minpoll);
+  NCR_ModifyMinpoll(get_record(slot)->data, new_minpoll);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1093,18 +1147,13 @@ NSR_ModifyMinpoll(IPAddr *address, int new_minpoll)
 int
 NSR_ModifyMaxpoll(IPAddr *address, int new_maxpoll)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMaxpoll(get_record(slot)->data, new_maxpoll);
+  NCR_ModifyMaxpoll(get_record(slot)->data, new_maxpoll);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1112,18 +1161,13 @@ NSR_ModifyMaxpoll(IPAddr *address, int new_maxpoll)
 int
 NSR_ModifyMaxdelay(IPAddr *address, double new_max_delay)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMaxdelay(get_record(slot)->data, new_max_delay);
+  NCR_ModifyMaxdelay(get_record(slot)->data, new_max_delay);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1131,18 +1175,13 @@ NSR_ModifyMaxdelay(IPAddr *address, double new_max_delay)
 int
 NSR_ModifyMaxdelayratio(IPAddr *address, double new_max_delay_ratio)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMaxdelayratio(get_record(slot)->data, new_max_delay_ratio);
+  NCR_ModifyMaxdelayratio(get_record(slot)->data, new_max_delay_ratio);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1150,18 +1189,13 @@ NSR_ModifyMaxdelayratio(IPAddr *address, double new_max_delay_ratio)
 int
 NSR_ModifyMaxdelaydevratio(IPAddr *address, double new_max_delay_dev_ratio)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMaxdelaydevratio(get_record(slot)->data, new_max_delay_dev_ratio);
+  NCR_ModifyMaxdelaydevratio(get_record(slot)->data, new_max_delay_dev_ratio);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1169,18 +1203,13 @@ NSR_ModifyMaxdelaydevratio(IPAddr *address, double new_max_delay_dev_ratio)
 int
 NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyMinstratum(get_record(slot)->data, new_min_stratum);
+  NCR_ModifyMinstratum(get_record(slot)->data, new_min_stratum);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1188,18 +1217,13 @@ NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum)
 int
 NSR_ModifyPolltarget(IPAddr *address, int new_poll_target)
 {
-  int slot, found;
+  int slot;
-  NTP_Remote_Address addr;
-  addr.ip_addr = *address;
-  addr.port = 0;
 
-  find_slot(&addr, &slot, &found);
+  if (!find_slot(address, &slot))
-  if (found == 0) {
     return 0;
-  } else {
+
-    NCR_ModifyPolltarget(get_record(slot)->data, new_poll_target);
+  NCR_ModifyPolltarget(get_record(slot)->data, new_poll_target);
-    return 1;
+  return 1;
-  }
 }
 
 /* ================================================== */
@@ -1235,13 +1259,9 @@ NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples,
 void
 NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
 {
-  NTP_Remote_Address rem_addr;
+  int slot;
-  int slot, found;
 
-  rem_addr.ip_addr = report->ip_addr;
+  if (find_slot(&report->ip_addr, &slot)) {
-  rem_addr.port = 0;
-  find_slot(&rem_addr, &slot, &found);
-  if (found) {
     NCR_ReportSource(get_record(slot)->data, report, now);
   } else {
     report->poll = 0;
@@ -1249,6 +1269,20 @@ NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
   }
 }
 
+/* ================================================== */
+
+int
+NSR_GetAuthReport(IPAddr *address, RPT_AuthReport *report)
+{
+  int slot;
+
+  if (!find_slot(address, &slot))
+    return 0;
+
+  NCR_GetAuthReport(get_record(slot)->data, report);
+  return 1;
+}
+
 /* ================================================== */
 /* The ip address is assumed to be completed on input, that is how we
    identify the source record. */
@@ -1256,13 +1290,9 @@ NSR_ReportSource(RPT_SourceReport *report, struct timespec *now)
 int
 NSR_GetNTPReport(RPT_NTPReport *report)
 {
-  NTP_Remote_Address rem_addr;
+  int slot;
-  int slot, found;
 
-  rem_addr.ip_addr = report->remote_addr;
+  if (!find_slot(&report->remote_addr, &slot))
-  rem_addr.port = 0;
-  find_slot(&rem_addr, &slot, &found);
-  if (!found)
     return 0;
 
   NCR_GetNTPReport(get_record(slot)->data, report);

ntp_sources.h

@@ -50,14 +50,15 @@ typedef enum {
 } NSR_Status;
 
 /* Procedure to add a new server or peer source. */
-extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params);
+extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
+                                SourceParameters *params, uint32_t *conf_id);
 
 /* 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,
-                                      SourceParameters *params);
+                                      SourceParameters *params, uint32_t *conf_id);
 
 /* Function type for handlers to be called back when an attempt
  * (possibly unsuccessful) to resolve unresolved sources ends */
@@ -76,7 +77,10 @@ extern void NSR_StartSources(void);
 extern void NSR_AutoStartSources(void);
 
 /* Procedure to remove a source */
-extern NSR_Status NSR_RemoveSource(NTP_Remote_Address *remote_addr);
+extern NSR_Status NSR_RemoveSource(IPAddr *address);
+
+/* Procedure to remove all sources matching a configuration ID */
+extern void NSR_RemoveSourcesById(uint32_t conf_id);
 
 /* Procedure to remove all sources */
 extern void NSR_RemoveAllSources(void);
@@ -136,6 +140,8 @@ extern int NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples, IPAd
 
 extern void NSR_ReportSource(RPT_SourceReport *report, struct timespec *now);
 
+extern int NSR_GetAuthReport(IPAddr *address, RPT_AuthReport *report);
+
 extern int NSR_GetNTPReport(RPT_NTPReport *report);
 
 extern void NSR_GetActivityReport(RPT_ActivityReport *report);

nts_ke.h

@@ -29,6 +29,8 @@
 
 #include "siv.h"
 
+#define NKE_PORT                        4460
+
 #define NKE_RECORD_CRITICAL_BIT         (1U << 15)
 #define NKE_RECORD_END_OF_MESSAGE       0
 #define NKE_RECORD_NEXT_PROTOCOL        1

nts_ke_client.c

@@ -58,7 +58,8 @@ struct NKC_Instance_Record {
 
 /* ================================================== */
 
-static void *client_credentials;
+static void *client_credentials = NULL;
+static int client_credentials_refs = 0;
 
 /* ================================================== */
 
@@ -71,7 +72,7 @@ name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *arg
   inst->resolving_name = 0;
 
   if (inst->destroying) {
-    NKC_DestroyInstance(inst);
+    Free(inst);
     return;
   }
 
@@ -84,7 +85,7 @@ name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *arg
 
   inst->ntp_address.ip_addr = ip_addrs[0];
 
-  /* Prefer an address of the same family as NTS-KE */
+  /* Prefer an address in the same family as the NTS-KE server */
   for (i = 0; i < n_addrs; i++) {
     DEBUG_LOG("%s resolved to %s", inst->server_name, UTI_IPToString(&ip_addrs[i]));
     if (ip_addrs[i].family == inst->address.ip_addr.family) {
@@ -168,13 +169,21 @@ process_response(NKC_Instance inst)
         error = 1;
         break;
       case NKE_RECORD_COOKIE:
-        DEBUG_LOG("Got cookie #%d length=%d", inst->num_cookies + 1, length);
+        DEBUG_LOG("Got cookie length=%d", length);
-        assert(NKE_MAX_COOKIE_LENGTH == sizeof (inst->cookies[inst->num_cookies].cookie));
+
-        if (length <= NKE_MAX_COOKIE_LENGTH && inst->num_cookies < NKE_MAX_COOKIES) {
+        if (length < 1 || length > NKE_MAX_COOKIE_LENGTH || length % 4 != 0 ||
-          inst->cookies[inst->num_cookies].length = length;
+            inst->num_cookies >= NKE_MAX_COOKIES) {
-          memcpy(inst->cookies[inst->num_cookies].cookie, data, length);
+          DEBUG_LOG("Unexpected length/cookie");
-          inst->num_cookies++;
+          break;
         }
+
+        assert(NKE_MAX_COOKIE_LENGTH == sizeof (inst->cookies[inst->num_cookies].cookie));
+        assert(NKE_MAX_COOKIES == sizeof (inst->cookies) /
+                                  sizeof (inst->cookies[inst->num_cookies]));
+        inst->cookies[inst->num_cookies].length = length;
+        memcpy(inst->cookies[inst->num_cookies].cookie, data, length);
+
+        inst->num_cookies++;
         break;
       case NKE_RECORD_NTPV4_SERVER_NEGOTIATION:
         if (length < 1 || length >= sizeof (inst->server_name)) {
@@ -256,23 +265,6 @@ handle_message(void *arg)
 
 /* ================================================== */
 
-void
-NKC_Initialise(void)
-{
-  client_credentials = NULL;
-}
-
-/* ================================================== */
-
-void
-NKC_Finalise(void)
-{
-  if (client_credentials)
-    NKSN_DestroyCertCredentials(client_credentials);
-}
-
-/* ================================================== */
-
 NKC_Instance
 NKC_CreateInstance(IPSockAddr *address, const char *name)
 {
@@ -287,10 +279,10 @@ NKC_CreateInstance(IPSockAddr *address, const char *name)
   inst->destroying = 0;
   inst->got_response = 0;
 
-  /* Create the credentials with the first client instance and share them
+  /* Share the credentials with other client instances */
-     with other instances */
   if (!client_credentials)
     client_credentials = NKSN_CreateCertCredentials(NULL, NULL, CNF_GetNtsTrustedCertFile());
+  client_credentials_refs++;
 
   return inst;
 }
@@ -300,15 +292,23 @@ NKC_CreateInstance(IPSockAddr *address, const char *name)
 void
 NKC_DestroyInstance(NKC_Instance inst)
 {
-  /* If the resolver is running, destroy the instance later when finished */
+  NKSN_DestroyInstance(inst->session);
+
+  Free(inst->name);
+
+  client_credentials_refs--;
+  if (client_credentials_refs <= 0 && client_credentials) {
+    NKSN_DestroyCertCredentials(client_credentials);
+    client_credentials = NULL;
+  }
+
+  /* If the asynchronous resolver is running, let the handler free
+     the instance later */
   if (inst->resolving_name) {
     inst->destroying = 1;
     return;
   }
 
-  NKSN_DestroyInstance(inst->session);
-
-  Free(inst->name);
   Free(inst);
 }
 
@@ -318,33 +318,35 @@ int
 NKC_Start(NKC_Instance inst)
 {
   IPSockAddr local_addr;
-  char label[512];
+  char label[512], *iface;
   int sock_fd;
 
   assert(!NKC_IsActive(inst));
 
+  inst->got_response = 0;
+
   if (!client_credentials) {
     DEBUG_LOG("Missing client credentials");
     return 0;
   }
 
-  /* Follow the bindacqaddress setting */
+  /* Follow the bindacqaddress and bindacqdevice settings */
   CNF_GetBindAcquisitionAddress(inst->address.ip_addr.family, &local_addr.ip_addr);
-  if (local_addr.ip_addr.family != inst->address.ip_addr.family)
-    SCK_GetAnyLocalIPAddress(inst->address.ip_addr.family, &local_addr.ip_addr);
-
   local_addr.port = 0;
-
+  iface = CNF_GetBindAcquisitionInterface();
-  sock_fd = SCK_OpenTcpSocket(&inst->address, &local_addr, 0);
-  if (sock_fd < 0)
-    return 0;
 
   /* Make a label containing both the address and name of the server */
   if (snprintf(label, sizeof (label), "%s (%s)",
                UTI_IPSockAddrToString(&inst->address), inst->name) >= sizeof (label))
     ;
 
-  /* Start a NTS-KE session */
+  sock_fd = SCK_OpenTcpSocket(&inst->address, &local_addr, iface, 0);
+  if (sock_fd < 0) {
+    LOG(LOGS_ERR, "Could not connect to %s", label);
+    return 0;
+  }
+
+  /* Start an NTS-KE session */
   if (!NKSN_StartSession(inst->session, sock_fd, label, client_credentials, CLIENT_TIMEOUT)) {
     SCK_CloseSocket(sock_fd);
     return 0;
@@ -388,7 +390,7 @@ NKC_GetNtsData(NKC_Instance inst, NKE_Context *context,
 
   *ntp_address = inst->ntp_address;
 
-  return i;
+  return 1;
 }
 
 /* ================================================== */

nts_ke_client.h

@@ -32,10 +32,6 @@
 
 typedef struct NKC_Instance_Record *NKC_Instance;
 
-/* Init and fini functions */
-extern void NKC_Initialise(void);
-extern void NKC_Finalise(void);
-
 /* Create a client NTS-KE instance */
 extern NKC_Instance NKC_CreateInstance(IPSockAddr *address, const char *name);
 

nts_ke_server.c

@@ -33,10 +33,12 @@
 #include "array.h"
 #include "conf.h"
 #include "clientlog.h"
+#include "local.h"
 #include "logging.h"
 #include "memory.h"
 #include "ntp_core.h"
 #include "nts_ke_session.h"
+#include "privops.h"
 #include "siv.h"
 #include "socket.h"
 #include "sched.h"
@@ -59,7 +61,7 @@
 
 typedef struct {
   uint32_t key_id;
-  uint8_t nonce[SERVER_COOKIE_NONCE_LENGTH];
+  unsigned char nonce[SERVER_COOKIE_NONCE_LENGTH];
 } ServerCookieHeader;
 
 typedef struct {
@@ -87,6 +89,7 @@ static int server_sock_fd4;
 static int server_sock_fd6;
 
 static int helper_sock_fd;
+static int is_helper;
 
 static int initialised = 0;
 
@@ -106,13 +109,15 @@ handle_client(int sock_fd, IPSockAddr *addr)
   NKSN_Instance inst, *instp;
   int i;
 
+  /* Leave at least half of the descriptors which can handled by select()
+     to other use */
   if (sock_fd > FD_SETSIZE / 2) {
     DEBUG_LOG("Rejected connection from %s (%s)",
               UTI_IPSockAddrToString(addr), "too many descriptors");
     return 0;
   }
 
-  /* Find a slot which is free or has a stopped session */
+  /* Find an unused server slot or one with an already stopped session */
   for (i = 0, inst = NULL; i < ARR_GetSize(sessions); i++) {
     instp = ARR_GetElement(sessions, i);
     if (!*instp) {
@@ -132,6 +137,8 @@ handle_client(int sock_fd, IPSockAddr *addr)
     return 0;
   }
 
+  assert(server_credentials);
+
   if (!NKSN_StartSession(inst, sock_fd, UTI_IPSockAddrToString(addr),
                          server_credentials, SERVER_TIMEOUT))
     return 0;
@@ -149,6 +156,8 @@ handle_helper_request(int fd, int event, void *arg)
   IPSockAddr client_addr;
   int sock_fd;
 
+  /* Receive the helper request with the NTS-KE session socket.
+     With multiple helpers EAGAIN errors are expected here. */
   message = SCK_ReceiveMessage(fd, SCK_FLAG_MSG_DESCRIPTOR);
   if (!message)
     return;
@@ -160,16 +169,20 @@ handle_helper_request(int fd, int event, void *arg)
     return;
   }
 
-  if (message->length != sizeof (HelperRequest)) {
+  if (!initialised) {
-    DEBUG_LOG("Unexpected message length");
+    DEBUG_LOG("Uninitialised helper");
     SCK_CloseSocket(sock_fd);
     return;
   }
 
+  if (message->length != sizeof (HelperRequest))
+    LOG_FATAL("Invalid helper request");
+
   req = message->data;
 
-  /* Extract the server key and client address from the request */
+  /* Extract the current server key and client address from the request */
   server_keys[current_server_key].id = ntohl(req->key_id);
+  assert(sizeof (server_keys[current_server_key].key) == sizeof (req->key));
   memcpy(server_keys[current_server_key].key, req->key,
          sizeof (server_keys[current_server_key].key));
   UTI_IPNetworkToHost(&req->client_addr, &client_addr.ip_addr);
@@ -177,7 +190,7 @@ handle_helper_request(int fd, int event, void *arg)
 
   if (!SIV_SetKey(server_keys[current_server_key].siv, server_keys[current_server_key].key,
                   SIV_GetKeyLength(SERVER_COOKIE_SIV)))
-    assert(0);
+    LOG_FATAL("Could not set SIV key");
 
   if (!handle_client(sock_fd, &client_addr)) {
     SCK_CloseSocket(sock_fd);
@@ -190,14 +203,14 @@ handle_helper_request(int fd, int event, void *arg)
 /* ================================================== */
 
 static void
-accept_connection(int server_fd, int event, void *arg)
+accept_connection(int listening_fd, int event, void *arg)
 {
   SCK_Message message;
   IPSockAddr addr;
   int log_index, sock_fd;
   struct timespec now;
 
-  sock_fd = SCK_AcceptConnection(server_fd, &addr);
+  sock_fd = SCK_AcceptConnection(listening_fd, &addr);
   if (sock_fd < 0)
     return;
 
@@ -209,8 +222,9 @@ accept_connection(int server_fd, int event, void *arg)
   }
 
   SCH_GetLastEventTime(&now, NULL, NULL);
-  log_index = CLG_LogNTPAccess(&addr.ip_addr, &now);
+
-  if (log_index >= 0 && CLG_LimitNTPResponseRate(log_index)) {
+  log_index = CLG_LogServiceAccess(CLG_NTSKE, &addr.ip_addr, &now);
+  if (log_index >= 0 && CLG_LimitServiceRate(CLG_NTSKE, log_index)) {
     DEBUG_LOG("Rejected connection from %s (%s)",
               UTI_IPSockAddrToString(&addr), "rate limit");
     SCK_CloseSocket(sock_fd);
@@ -222,9 +236,11 @@ accept_connection(int server_fd, int event, void *arg)
   if (helper_sock_fd != INVALID_SOCK_FD) {
     HelperRequest req;
 
-    /* Include the current server key and client address in the request */
     memset(&req, 0, sizeof (req));
+
+    /* Include the current server key and client address in the request */
     req.key_id = htonl(server_keys[current_server_key].id);
+    assert(sizeof (req.key) == sizeof (server_keys[current_server_key].key));
     memcpy(req.key, server_keys[current_server_key].key, sizeof (req.key));
     UTI_IPHostToNetwork(&addr.ip_addr, &req.client_addr);
     req.client_port = htons(addr.port);
@@ -234,7 +250,12 @@ accept_connection(int server_fd, int event, void *arg)
     message.length = sizeof (req);
     message.descriptor = sock_fd;
 
+    errno = 0;
     if (!SCK_SendMessage(helper_sock_fd, &message, SCK_FLAG_MSG_DESCRIPTOR)) {
+      /* If sending failed with EPIPE, it means all helpers closed their end of
+         the socket (e.g. due to a fatal error) */
+      if (errno == EPIPE)
+        LOG_FATAL("NTS-KE helpers failed");
       SCK_CloseSocket(sock_fd);
       return;
     }
@@ -253,28 +274,30 @@ accept_connection(int server_fd, int event, void *arg)
 /* ================================================== */
 
 static int
-open_socket(int family, int port)
+open_socket(int family)
 {
   IPSockAddr local_addr;
-  int sock_fd;
+  int backlog, sock_fd;
+  char *iface;
 
-  if (!SCK_IsFamilySupported(family))
+  if (!SCK_IsIpFamilyEnabled(family))
     return INVALID_SOCK_FD;
 
   CNF_GetBindAddress(family, &local_addr.ip_addr);
+  local_addr.port = CNF_GetNtsServerPort();
+  iface = CNF_GetBindNtpInterface();
 
-  if (local_addr.ip_addr.family != family)
+  sock_fd = SCK_OpenTcpSocket(NULL, &local_addr, iface, 0);
-    SCK_GetAnyLocalIPAddress(family, &local_addr.ip_addr);
-
-  local_addr.port = port;
-
-  sock_fd = SCK_OpenTcpSocket(NULL, &local_addr, 0);
   if (sock_fd < 0) {
     LOG(LOGS_ERR, "Could not open NTS-KE socket on %s", UTI_IPSockAddrToString(&local_addr));
     return INVALID_SOCK_FD;
   }
 
-  if (!SCK_ListenOnSocket(sock_fd, CNF_GetNtsServerConnections())) {
+  /* Set the maximum number of waiting connections on the socket to the maximum
+     number of concurrent sessions */
+  backlog = MAX(CNF_GetNtsServerProcesses(), 1) * CNF_GetNtsServerConnections();
+
+  if (!SCK_ListenOnSocket(sock_fd, backlog)) {
     SCK_CloseSocket(sock_fd);
     return INVALID_SOCK_FD;
   }
@@ -311,6 +334,15 @@ prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_a
     datum = htons(error);
     if (!NKSN_AddRecord(session, 1, NKE_RECORD_ERROR, &datum, sizeof (datum)))
       return 0;
+  } else if (next_protocol < 0) {
+    if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, NULL, 0))
+      return 0;
+  } else if (aead_algorithm < 0) {
+    datum = htons(next_protocol);
+    if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, &datum, sizeof (datum)))
+      return 0;
+    if (!NKSN_AddRecord(session, 1, NKE_RECORD_AEAD_ALGORITHM, NULL, 0))
+      return 0;
   } else {
     datum = htons(next_protocol);
     if (!NKSN_AddRecord(session, 1, NKE_RECORD_NEXT_PROTOCOL, &datum, sizeof (datum)))
@@ -357,6 +389,8 @@ prepare_response(NKSN_Instance session, int error, int next_protocol, int aead_a
 static int
 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;
   uint16_t data[NKE_MAX_RECORD_BODY_LENGTH / sizeof (uint16_t)];
@@ -364,7 +398,7 @@ process_request(NKSN_Instance session)
   assert(NKE_MAX_RECORD_BODY_LENGTH % sizeof (uint16_t) == 0);
   assert(sizeof (uint16_t) == 2);
 
-  while (error == -1) {
+  while (error < 0) {
     if (!NKSN_GetRecord(session, &critical, &type, &length, &data, sizeof (data)))
       break;
 
@@ -374,7 +408,11 @@ process_request(NKSN_Instance session)
           error = NKE_ERROR_BAD_REQUEST;
           break;
         }
+
+        next_protocol_records++;
+
         for (i = 0; i < MIN(length, sizeof (data)) / 2; i++) {
+          next_protocol_values++;
           if (ntohs(data[i]) == NKE_NEXT_PROTOCOL_NTPV4)
             next_protocol = NKE_NEXT_PROTOCOL_NTPV4;
         }
@@ -384,7 +422,11 @@ process_request(NKSN_Instance session)
           error = NKE_ERROR_BAD_REQUEST;
           break;
         }
+
+        aead_algorithm_records++;
+
         for (i = 0; i < MIN(length, sizeof (data)) / 2; i++) {
+          aead_algorithm_values++;
           if (ntohs(data[i]) == AEAD_AES_SIV_CMAC_256)
             aead_algorithm = AEAD_AES_SIV_CMAC_256;
         }
@@ -400,8 +442,12 @@ process_request(NKSN_Instance session)
     }
   }
 
-  if (aead_algorithm < 0 || next_protocol < 0)
+  if (error < 0) {
-    error = NKE_ERROR_BAD_REQUEST;
+    if (next_protocol_records != 1 || next_protocol_values < 1 ||
+        (next_protocol == NKE_NEXT_PROTOCOL_NTPV4 &&
+         (aead_algorithm_records != 1 || aead_algorithm_values < 1)))
+      error = NKE_ERROR_BAD_REQUEST;
+  }
 
   if (!prepare_response(session, error, next_protocol, aead_algorithm))
     return 0;
@@ -426,18 +472,22 @@ generate_key(int index)
 {
   int key_length;
 
-  assert(index < MAX_SERVER_KEYS);
+  if (index < 0 || index >= MAX_SERVER_KEYS)
+    assert(0);
 
   key_length = SIV_GetKeyLength(SERVER_COOKIE_SIV);
   if (key_length > sizeof (server_keys[index].key))
     assert(0);
 
   UTI_GetRandomBytesUrandom(server_keys[index].key, key_length);
-  if (!SIV_SetKey(server_keys[index].siv, server_keys[index].key, key_length))
+
-    assert(0);
+  if (!server_keys[index].siv ||
+      !SIV_SetKey(server_keys[index].siv, server_keys[index].key, key_length))
+    LOG_FATAL("Could not set SIV key");
 
   UTI_GetRandomBytes(&server_keys[index].id, sizeof (server_keys[index].id));
 
+  /* Encode the index in the lowest bits of the ID */
   server_keys[index].id &= -1U << KEY_ID_INDEX_BITS;
   server_keys[index].id |= index;
 
@@ -486,6 +536,7 @@ save_keys(void)
 
   fclose(f);
 
+  /* Rename the temporary file, or remove it if that fails */
   if (!UTI_RenameTempFile(dump_dir, DUMP_FILENAME, ".tmp", NULL)) {
     if (!UTI_RemoveFile(dump_dir, DUMP_FILENAME, ".tmp"))
       ;
@@ -509,6 +560,7 @@ static void
 load_keys(void)
 {
   char *dump_dir, line[1024], *words[MAX_WORDS];
+  unsigned char key[SIV_MAX_KEY_LENGTH];
   int i, index, key_length, algorithm;
   double key_age;
   FILE *f;
@@ -536,15 +588,17 @@ load_keys(void)
         sscanf(words[0], "%"PRIX32, &id) != 1)
       goto error;
 
-    index = id % MAX_SERVER_KEYS;
+    if (UTI_HexToBytes(words[1], key, sizeof (key)) != key_length)
-
-    if (UTI_HexToBytes(words[1], server_keys[index].key,
-                       sizeof (server_keys[index].key)) != key_length)
       goto error;
 
+    index = id % MAX_SERVER_KEYS;
+
     server_keys[index].id = id;
+    assert(sizeof (server_keys[index].key) == sizeof (key));
+    memcpy(server_keys[index].key, key, key_length);
+
     if (!SIV_SetKey(server_keys[index].siv, server_keys[index].key, key_length))
-      assert(0);
+      LOG_FATAL("Could not set SIV key");
 
     DEBUG_LOG("Loaded key %"PRIX32, id);
 
@@ -575,36 +629,43 @@ key_timeout(void *arg)
 /* ================================================== */
 
 static void
-start_helper(int id, int scfilter_level, int main_fd, int helper_fd)
+run_helper(uid_t uid, gid_t gid, int scfilter_level)
 {
-  pid_t pid;
+  LOG_Severity log_severity;
 
-  pid = fork();
+  /* Finish minimal initialisation and run using the scheduler loop
+     similarly to the main process */
 
-  if (pid < 0)
+  DEBUG_LOG("Helper started");
-    LOG_FATAL("fork() failed : %s", strerror(errno));
 
-  if (pid > 0)
+  /* Suppress a log message about disabled clock control */
-    return;
+  log_severity = LOG_GetMinSeverity();
+  LOG_SetMinSeverity(LOGS_ERR);
 
-  SCK_CloseSocket(main_fd);
+  SYS_Initialise(0);
+  LOG_SetMinSeverity(log_severity);
+
+  if (!geteuid() && (uid || gid))
+    SYS_DropRoot(uid, gid);
+
+  NKS_Initialise();
 
-  LOG_CloseParentFd();
-  SCH_Reset();
-  SCH_AddFileHandler(helper_fd, SCH_FILE_INPUT, handle_helper_request, NULL);
   UTI_SetQuitSignalsHandler(helper_signal, 1);
   if (scfilter_level != 0)
     SYS_EnableSystemCallFilter(scfilter_level, SYS_NTSKE_HELPER);
 
-  initialised = 1;
-
-  DEBUG_LOG("NTS-KE helper #%d started", id);
-
   SCH_MainLoop();
 
-  NKS_Finalise();
+  DEBUG_LOG("Helper exiting");
 
-  DEBUG_LOG("NTS-KE helper #%d exiting", id);
+  NKS_Finalise();
+  SCK_Finalise();
+  SYS_Finalise();
+  SCH_Finalise();
+  LCL_Finalise();
+  PRV_Finalise();
+  CNF_Finalise();
+  LOG_Finalise();
 
   exit(0);
 }
@@ -612,15 +673,65 @@ start_helper(int id, int scfilter_level, int main_fd, int helper_fd)
 /* ================================================== */
 
 void
-NKS_Initialise(int scfilter_level)
+NKS_PreInitialise(uid_t uid, gid_t gid, int scfilter_level)
+{
+  int i, processes, sock_fd1, sock_fd2;
+  char prefix[16];
+  pid_t pid;
+
+  helper_sock_fd = INVALID_SOCK_FD;
+  is_helper = 0;
+
+  if (!CNF_GetNtsServerCertFile() || !CNF_GetNtsServerKeyFile())
+    return;
+
+  processes = CNF_GetNtsServerProcesses();
+  if (processes <= 0)
+    return;
+
+  /* Start helper processes to perform (computationally expensive) NTS-KE
+     sessions with clients on sockets forwarded from the main process */
+
+  sock_fd1 = SCK_OpenUnixSocketPair(0, &sock_fd2);
+  if (sock_fd1 < 0)
+    LOG_FATAL("Could not open socket pair");
+
+  for (i = 0; i < processes; i++) {
+    pid = fork();
+
+    if (pid < 0)
+      LOG_FATAL("fork() failed : %s", strerror(errno));
+
+    if (pid > 0)
+      continue;
+
+    is_helper = 1;
+
+    snprintf(prefix, sizeof (prefix), "nks#%d:", i + 1);
+    LOG_SetDebugPrefix(prefix);
+    LOG_CloseParentFd();
+
+    SCK_CloseSocket(sock_fd1);
+    SCH_AddFileHandler(sock_fd2, SCH_FILE_INPUT, handle_helper_request, NULL);
+
+    run_helper(uid, gid, scfilter_level);
+  }
+
+  SCK_CloseSocket(sock_fd2);
+  helper_sock_fd = sock_fd1;
+}
+
+/* ================================================== */
+
+void
+NKS_Initialise(void)
 {
   char *cert, *key;
-  int i, processes;
   double key_delay;
+  int i;
 
   server_sock_fd4 = INVALID_SOCK_FD;
   server_sock_fd6 = INVALID_SOCK_FD;
-  helper_sock_fd = INVALID_SOCK_FD;
 
   cert = CNF_GetNtsServerCertFile();
   key = CNF_GetNtsServerKeyFile();
@@ -628,19 +739,20 @@ NKS_Initialise(int scfilter_level)
   if (!cert || !key)
     return;
 
-  server_credentials = NKSN_CreateCertCredentials(cert, key, NULL);
+  if (helper_sock_fd == INVALID_SOCK_FD) {
-  if (!server_credentials)
+    server_credentials = NKSN_CreateCertCredentials(cert, key, NULL);
-    return;
+    if (!server_credentials)
+      return;
+  } else {
+    server_credentials = NULL;
+  }
 
   sessions = ARR_CreateInstance(sizeof (NKSN_Instance));
   for (i = 0; i < CNF_GetNtsServerConnections(); i++)
     *(NKSN_Instance *)ARR_GetNewElement(sessions) = NULL;
-  for (i = 0; i < MAX_SERVER_KEYS; i++)
-    server_keys[i].siv = NULL;
-
-  server_sock_fd4 = open_socket(IPADDR_INET4, CNF_GetNtsServerPort());
-  server_sock_fd6 = open_socket(IPADDR_INET6, CNF_GetNtsServerPort());
 
+  /* Generate random keys, even if they will be replaced by reloaded keys,
+     or unused (in the helper) */
   for (i = 0; i < MAX_SERVER_KEYS; i++) {
     server_keys[i].siv = SIV_CreateInstance(SERVER_COOKIE_SIV);
     generate_key(i);
@@ -648,29 +760,18 @@ NKS_Initialise(int scfilter_level)
 
   current_server_key = MAX_SERVER_KEYS - 1;
 
-  load_keys();
+  if (!is_helper) {
+    server_sock_fd4 = open_socket(IPADDR_INET4);
+    server_sock_fd6 = open_socket(IPADDR_INET6);
 
-  key_rotation_interval = MAX(CNF_GetNtsRotate(), 0);
+    load_keys();
 
-  if (key_rotation_interval > 0) {
+    key_rotation_interval = MAX(CNF_GetNtsRotate(), 0);
-    key_delay = key_rotation_interval - (SCH_GetLastEventMonoTime() - last_server_key_ts);
-    SCH_AddTimeoutByDelay(MAX(key_delay, 0.0), key_timeout, NULL);
-  }
 
-  processes = CNF_GetNtsServerProcesses();
+    if (key_rotation_interval > 0) {
-
+      key_delay = key_rotation_interval - (SCH_GetLastEventMonoTime() - last_server_key_ts);
-  if (processes > 0) {
+      SCH_AddTimeoutByDelay(MAX(key_delay, 0.0), key_timeout, NULL);
-    int sock_fd1, sock_fd2;
+    }
-
-    sock_fd1 = SCK_OpenUnixSocketPair(0, &sock_fd2);
-    if (sock_fd1 < 0)
-      LOG_FATAL("Could not open socket pair");
-
-    for (i = 0; i < processes; i++)
-      start_helper(i + 1, scfilter_level, sock_fd1, sock_fd2);
-
-    SCK_CloseSocket(sock_fd2);
-    helper_sock_fd = sock_fd1;
   }
 
   initialised = 1;
@@ -687,6 +788,7 @@ NKS_Finalise(void)
     return;
 
   if (helper_sock_fd != INVALID_SOCK_FD) {
+    /* Send the helpers a request to exit */
     for (i = 0; i < CNF_GetNtsServerProcesses(); i++) {
       if (!SCK_Send(helper_sock_fd, "", 1, 0))
         ;
@@ -698,11 +800,11 @@ NKS_Finalise(void)
   if (server_sock_fd6 != INVALID_SOCK_FD)
     SCK_CloseSocket(server_sock_fd6);
 
-  save_keys();
+  if (!is_helper)
-  for (i = 0; i < MAX_SERVER_KEYS; i++) {
+    save_keys();
-    if (server_keys[i].siv != NULL)
+
-      SIV_DestroyInstance(server_keys[i].siv);
+  for (i = 0; i < MAX_SERVER_KEYS; i++)
-  }
+    SIV_DestroyInstance(server_keys[i].siv);
 
   for (i = 0; i < ARR_GetSize(sessions); i++) {
     NKSN_Instance session = *(NKSN_Instance *)ARR_GetElement(sessions, i);
@@ -711,7 +813,8 @@ NKS_Finalise(void)
   }
   ARR_DestroyInstance(sessions);
 
-  NKSN_DestroyCertCredentials(server_credentials);
+  if (server_credentials)
+    NKSN_DestroyCertCredentials(server_credentials);
 }
 
 /* ================================================== */
@@ -808,7 +911,7 @@ NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context)
     return 0;
   }
 
-  if (cookie->length <= sizeof (*header)) {
+  if (cookie->length <= (int)sizeof (*header)) {
     DEBUG_LOG("Invalid cookie length");
     return 0;
   }

nts_ke_server.h

@@ -30,7 +30,8 @@
 #include "nts_ke.h"
 
 /* Init and fini functions */
-extern void NKS_Initialise(int scfilter_level);
+extern void NKS_PreInitialise(uid_t uid, gid_t gid, int scfilter_level);
+extern void NKS_Initialise(void);
 extern void NKS_Finalise(void);
 
 /* Save the current server keys */

nts_ke_session.c

@@ -81,7 +81,6 @@ struct NKSN_Instance_Record {
 
   struct Message message;
   int new_message;
-  int ended_message;
 };
 
 /* ================================================== */
@@ -110,6 +109,8 @@ add_record(struct Message *message, int critical, int type, const void *body, in
 {
   struct RecordHeader header;
 
+  assert(message->length <= sizeof (message->data));
+
   if (body_length < 0 || body_length > 0xffff || type < 0 || type > 0x7fff ||
       message->length + sizeof (header) + body_length > sizeof (message->data))
     return 0;
@@ -153,6 +154,7 @@ get_record(struct Message *message, int *critical, int *type, int *body_length,
 
   blen = ntohs(header.body_length);
   rlen = sizeof (header) + blen;
+  assert(blen >= 0 && rlen > 0);
 
   if (message->length < message->parsed + rlen)
     return 0;
@@ -215,7 +217,8 @@ create_tls_session(int server_mode, int sock_fd, const char *server_name,
   unsigned int flags;
   int r;
 
-  r = gnutls_init(&session, GNUTLS_NONBLOCK | (server_mode ? GNUTLS_SERVER : GNUTLS_CLIENT));
+  r = gnutls_init(&session, GNUTLS_NONBLOCK | GNUTLS_NO_TICKETS |
+                  (server_mode ? GNUTLS_SERVER : GNUTLS_CLIENT));
   if (r < 0) {
     LOG(LOGS_ERR, "Could not %s TLS session : %s", "create", gnutls_strerror(r));
     return NULL;
@@ -302,33 +305,25 @@ session_timeout(void *arg)
 /* ================================================== */
 
 static int
-get_socket_error(int sock_fd)
+check_alpn(NKSN_Instance inst)
 {
-  int optval;
+  gnutls_datum_t alpn;
-  socklen_t optlen = sizeof (optval);
 
-  if (getsockopt(sock_fd, SOL_SOCKET, SO_ERROR, &optval, &optlen) < 0) {
+  if (gnutls_alpn_get_selected_protocol(inst->tls_session, &alpn) < 0 ||
-    DEBUG_LOG("getsockopt() failed : %s", strerror(errno));
+      alpn.size != sizeof (NKE_ALPN_NAME) - 1 ||
-    return EINVAL;
+      memcmp(alpn.data, NKE_ALPN_NAME, sizeof (NKE_ALPN_NAME) - 1) != 0)
-  }
+    return 0;
 
-  return optval;
+  return 1;
 }
 
 /* ================================================== */
 
-static int
+static void
-check_alpn(NKSN_Instance inst)
+set_input_output(NKSN_Instance inst, int output)
 {
-  gnutls_datum_t alpn;
+  SCH_SetFileHandlerEvent(inst->sock_fd, SCH_FILE_INPUT, !output);
-  int r;
+  SCH_SetFileHandlerEvent(inst->sock_fd, SCH_FILE_OUTPUT, output);
-
-  r = gnutls_alpn_get_selected_protocol(inst->tls_session, &alpn);
-  if (r < 0 || alpn.size != sizeof (NKE_ALPN_NAME) - 1 ||
-      strncmp((const char *)alpn.data, NKE_ALPN_NAME, sizeof (NKE_ALPN_NAME) - 1))
-    return 0;
-
-  return 1;
 }
 
 /* ================================================== */
@@ -354,7 +349,7 @@ change_state(NKSN_Instance inst, KeState state)
       assert(0);
   }
 
-  SCH_SetFileHandlerEvent(inst->sock_fd, SCH_FILE_OUTPUT, output);
+  set_input_output(inst, output);
 
   inst->state = state;
 }
@@ -375,9 +370,11 @@ handle_event(NKSN_Instance inst, int event)
       if (event != SCH_FILE_OUTPUT)
         return 0;
 
-      r = get_socket_error(inst->sock_fd);
+      /* Get the socket error */
+      if (!SCK_GetIntOption(inst->sock_fd, SOL_SOCKET, SO_ERROR, &r))
+        r = EINVAL;
 
-      if (r) {
+      if (r != 0) {
         LOG(LOGS_ERR, "Could not connect to %s : %s", inst->label, strerror(r));
         stop_session(inst);
         return 0;
@@ -393,8 +390,22 @@ handle_event(NKSN_Instance inst, int event)
 
       if (r < 0) {
         if (gnutls_error_is_fatal(r)) {
+          gnutls_datum_t cert_error;
+
+          /* Get a description of verification errors */
+          if (r != GNUTLS_E_CERTIFICATE_VERIFICATION_ERROR ||
+              gnutls_certificate_verification_status_print(
+                          gnutls_session_get_verify_cert_status(inst->tls_session),
+                          gnutls_certificate_type_get(inst->tls_session), &cert_error, 0) < 0)
+            cert_error.data = NULL;
+
           LOG(inst->server ? LOGS_DEBUG : LOGS_ERR,
-              "TLS handshake with %s failed : %s", inst->label, gnutls_strerror(r));
+              "TLS handshake with %s failed : %s%s%s", inst->label, gnutls_strerror(r),
+              cert_error.data ? " " : "", cert_error.data ? (const char *)cert_error.data : "");
+
+          if (cert_error.data)
+            gnutls_free(cert_error.data);
+
           stop_session(inst);
 
           /* Increase the retry interval if the handshake did not fail due
@@ -406,8 +417,7 @@ handle_event(NKSN_Instance inst, int event)
         }
 
         /* Disable output when the handshake is trying to receive data */
-        SCH_SetFileHandlerEvent(inst->sock_fd, SCH_FILE_OUTPUT,
+        set_input_output(inst, gnutls_record_get_direction(inst->tls_session));
-                                gnutls_record_get_direction(inst->tls_session));
         return 0;
       }
 
@@ -432,6 +442,7 @@ handle_event(NKSN_Instance inst, int event)
 
     case KE_SEND:
       assert(inst->new_message && message->complete);
+      assert(message->length <= sizeof (message->data) && message->length > message->sent);
 
       r = gnutls_record_send(inst->tls_session, &message->data[message->sent],
                              message->length - message->sent);
@@ -499,7 +510,9 @@ handle_event(NKSN_Instance inst, int event)
 
       /* Server will send a response to the client */
       change_state(inst, inst->server ? KE_SEND : KE_SHUTDOWN);
-      break;
+
+      /* Return success to process the received message */
+      return 1;
 
     case KE_SHUTDOWN:
       r = gnutls_bye(inst->tls_session, GNUTLS_SHUT_RDWR);
@@ -512,8 +525,7 @@ handle_event(NKSN_Instance inst, int event)
         }
 
         /* Disable output when the TLS shutdown is trying to receive data */
-        SCH_SetFileHandlerEvent(inst->sock_fd, SCH_FILE_OUTPUT,
+        set_input_output(inst, gnutls_record_get_direction(inst->tls_session));
-                                gnutls_record_get_direction(inst->tls_session));
         return 0;
       }
 
@@ -525,9 +537,8 @@ handle_event(NKSN_Instance inst, int event)
 
     default:
       assert(0);
+      return 0;
   }
-
-  return 1;
 }
 
 /* ================================================== */
@@ -540,6 +551,9 @@ read_write_socket(int fd, int event, void *arg)
   if (!handle_event(inst, event))
     return;
 
+  /* A valid message was received.  Call the handler to process the message,
+     and prepare a response if it is a server. */
+
   reset_message_parsing(&inst->message);
 
   if (!(inst->handler)(inst->handler_arg)) {
@@ -588,16 +602,19 @@ init_gnutls(void)
   if (r < 0)
     LOG_FATAL("Could not initialise %s : %s", "gnutls", gnutls_strerror(r));
 
-  /* NTS specification requires TLS1.3 or later */
+  /* Prepare a priority cache for server and client NTS-KE sessions
+     (the NTS specification requires TLS1.3 or later) */
   r = gnutls_priority_init2(&priority_cache,
-                            "-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1:-VERS-TLS1.2",
+                            "-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1:-VERS-TLS1.2:-VERS-DTLS-ALL",
                             NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND);
   if (r < 0)
     LOG_FATAL("Could not initialise %s : %s", "priority cache", gnutls_strerror(r));
 
+  /* Use our clock instead of the system clock in certificate verification */
   gnutls_global_set_time_function(get_time);
 
   gnutls_initialised = 1;
+  DEBUG_LOG("Initialised");
 
   LCL_AddParameterChangeHandler(handle_step, NULL);
 }
@@ -607,13 +624,15 @@ init_gnutls(void)
 static void
 deinit_gnutls(void)
 {
-  assert(gnutls_initialised);
+  if (!gnutls_initialised || credentials_counter > 0)
+    return;
 
   LCL_RemoveParameterChangeHandler(handle_step, NULL);
 
   gnutls_priority_deinit(priority_cache);
   gnutls_global_deinit();
   gnutls_initialised = 0;
+  DEBUG_LOG("Deinitialised");
 }
 
 /* ================================================== */
@@ -658,6 +677,7 @@ error:
   LOG(LOGS_ERR, "Could not set credentials : %s", gnutls_strerror(r));
   if (credentials)
     gnutls_certificate_free_credentials(credentials);
+  deinit_gnutls();
   return NULL;
 }
 
@@ -668,9 +688,6 @@ NKSN_DestroyCertCredentials(void *credentials)
 {
   gnutls_certificate_free_credentials(credentials);
   credentials_counter--;
-  if (credentials_counter != 0)
-    return;
-
   deinit_gnutls();
 }
 
@@ -688,7 +705,7 @@ NKSN_CreateInstance(int server_mode, const char *server_name,
   inst->server_name = server_name ? Strdup(server_name) : NULL;
   inst->handler = handler;
   inst->handler_arg = handler_arg;
-  /* Replace NULL arg with the session itself */
+  /* Replace a NULL argument with the session itself */
   if (!inst->handler_arg)
     inst->handler_arg = inst;
 
@@ -735,7 +752,6 @@ NKSN_StartSession(NKSN_Instance inst, int sock_fd, const char *label,
 
   reset_message(&inst->message);
   inst->new_message = 0;
-  inst->ended_message = 0;
 
   change_state(inst, inst->server ? KE_HANDSHAKE : KE_WAIT_CONNECT);
 
@@ -769,6 +785,7 @@ NKSN_EndMessage(NKSN_Instance inst)
 {
   assert(!inst->message.complete);
 
+  /* Terminate the message */
   if (!add_record(&inst->message, 1, NKE_RECORD_END_OF_MESSAGE, NULL, 0))
     return 0;
 
@@ -787,9 +804,13 @@ NKSN_GetRecord(NKSN_Instance inst, int *critical, int *type, int *body_length,
 
   assert(inst->message.complete);
 
+  if (body_length)
+    *body_length = 0;
+
   if (!get_record(&inst->message, critical, &type2, body_length, body, buffer_length))
     return 0;
 
+  /* Hide the end-of-message record */
   if (type2 == NKE_RECORD_END_OF_MESSAGE)
     return 0;
 

nts_ke_session.h

@@ -32,7 +32,7 @@
 
 typedef struct NKSN_Instance_Record *NKSN_Instance;
 
-/* Handler for received NTS-KE messages.  A non-zero return code stops
+/* Handler for received NTS-KE messages.  A zero return code stops
    the session. */
 typedef int (*NKSN_MessageHandler)(void *arg);
 

nts_ntp_auth.c

@@ -102,6 +102,10 @@ 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);
+
   memcpy(body, nonce, nonce_length);
   memset(body + nonce_length, 0, nonce_padding);
 
@@ -128,11 +132,14 @@ NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, in
   void *ef_body;
   struct AuthHeader *header;
 
+  if (buffer_length < 0)
+    return 0;
+
   if (!NEF_ParseField(packet, info->length, ef_start,
                       NULL, &ef_type, &ef_body, &ef_body_length))
     return 0;
 
-  if (ef_type != NTP_EF_NTS_AUTH_AND_EEF)
+  if (ef_type != NTP_EF_NTS_AUTH_AND_EEF || ef_body_length < sizeof (*header))
     return 0;
 
   header = ef_body;
@@ -145,7 +152,7 @@ NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, in
     return 0;
 
   nonce = (unsigned char *)(header + 1);
-  ciphertext = (unsigned char *)(header + 1) + get_padded_length(nonce_length);
+  ciphertext = nonce + get_padded_length(nonce_length);
 
   siv_tag_length = SIV_GetTagLength(siv);
 
@@ -163,8 +170,9 @@ NNA_DecryptAuthEF(NTP_Packet *packet, NTP_PacketInfo *info, SIV_Instance siv, in
   }
 
   *plaintext_length = ciphertext_length - siv_tag_length;
+  assert(*plaintext_length >= 0);
 
-  if (!SIV_Decrypt(siv, nonce, nonce_length, packet, info->length - ef_body_length - 4,
+  if (!SIV_Decrypt(siv, nonce, nonce_length, packet, ef_start,
                    ciphertext, ciphertext_length, plaintext, *plaintext_length)) {
     DEBUG_LOG("SIV decrypt failed");
     return 0;

nts_ntp_client.c

@@ -43,14 +43,17 @@
 #include "siv.h"
 #include "util.h"
 
+/* Maximum length of all cookies to avoid IP fragmentation */
 #define MAX_TOTAL_COOKIE_LENGTH (8 * 108)
 
+/* Magic string of files containing keys and cookies */
 #define DUMP_IDENTIFIER "NNC0\n"
 
 struct NNC_Instance_Record {
   const IPSockAddr *ntp_address;
   IPSockAddr nts_address;
   char *name;
+
   NKC_Instance nke;
   SIV_Instance siv;
 
@@ -60,9 +63,11 @@ struct NNC_Instance_Record {
   double last_nke_success;
 
   NKE_Context context;
+  unsigned int context_id;
   NKE_Cookie cookies[NTS_MAX_COOKIES];
   int num_cookies;
   int cookie_index;
+  int auth_ready;
   int nak_response;
   int ok_response;
   unsigned char nonce[NTS_MIN_UNPADDED_NONCE_LENGTH];
@@ -79,14 +84,24 @@ static void load_cookies(NNC_Instance inst);
 static void
 reset_instance(NNC_Instance inst)
 {
+  if (inst->nke)
+    NKC_DestroyInstance(inst->nke);
+  inst->nke = NULL;
+  if (inst->siv)
+    SIV_DestroyInstance(inst->siv);
+  inst->siv = NULL;
+
   inst->load_attempt = 0;
   inst->nke_attempts = 0;
   inst->next_nke_attempt = 0.0;
   inst->last_nke_success = 0.0;
 
   memset(&inst->context, 0, sizeof (inst->context));
+  inst->context_id = 0;
+  memset(inst->cookies, 0, sizeof (inst->cookies));
   inst->num_cookies = 0;
   inst->cookie_index = 0;
+  inst->auth_ready = 0;
   inst->nak_response = 0;
   inst->ok_response = 1;
   memset(inst->nonce, 0, sizeof (inst->nonce));
@@ -120,10 +135,7 @@ NNC_DestroyInstance(NNC_Instance inst)
 {
   save_cookies(inst);
 
-  if (inst->nke)
+  reset_instance(inst);
-    NKC_DestroyInstance(inst->nke);
-  if (inst->siv)
-    SIV_DestroyInstance(inst->siv);
 
   Free(inst->name);
   Free(inst);
@@ -134,17 +146,15 @@ NNC_DestroyInstance(NNC_Instance inst)
 static int
 check_cookies(NNC_Instance inst)
 {
-  /* Force NKE if a NAK was received since last valid auth */
+  /* Force a new NTS-KE session if a NAK was received without a valid response,
-  if (inst->nak_response && !inst->ok_response && inst->num_cookies > 0) {
+     or the keys encrypting the cookies need to be refreshed */
+  if (inst->num_cookies > 0 &&
+      ((inst->nak_response && !inst->ok_response) ||
+       SCH_GetLastEventMonoTime() - inst->last_nke_success > CNF_GetNtsRefresh())) {
     inst->num_cookies = 0;
     DEBUG_LOG("Dropped cookies");
   }
 
-  /* Force NKE if the keys encrypting the cookies are too old */
-  if (inst->num_cookies > 0 &&
-      SCH_GetLastEventMonoTime() - inst->last_nke_success > CNF_GetNtsRefresh())
-    inst->num_cookies = 0;
-
   return inst->num_cookies > 0;
 }
 
@@ -201,10 +211,11 @@ get_cookies(NNC_Instance inst)
   double now;
   int got_data;
 
-  assert(!check_cookies(inst));
+  assert(inst->num_cookies == 0);
 
   now = SCH_GetLastEventMonoTime();
 
+  /* Create and start a new NTS-KE session if not already present */
   if (!inst->nke) {
     if (now < inst->next_nke_attempt) {
       DEBUG_LOG("Limiting NTS-KE request rate (%f seconds)",
@@ -229,9 +240,13 @@ get_cookies(NNC_Instance inst)
 
   update_next_nke_attempt(inst, now);
 
+  /* Wait until the session stops */
   if (NKC_IsActive(inst->nke))
     return 0;
 
+  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,
                             inst->cookies, &inst->num_cookies, NTS_MAX_COOKIES,
                             &ntp_address);
@@ -246,17 +261,20 @@ get_cookies(NNC_Instance inst)
     SIV_DestroyInstance(inst->siv);
   inst->siv = NULL;
 
+  inst->context_id++;
+
+  /* Force a new session if the NTP address is used by another source, with
+     an expectation that it will eventually get a non-conflicting address */
   if (!set_ntp_address(inst, &ntp_address)) {
     inst->num_cookies = 0;
     return 0;
   }
 
+  inst->last_nke_success = now;
   inst->cookie_index = 0;
 
   inst->nak_response = 0;
 
-  inst->last_nke_success = now;
-
   return 1;
 }
 
@@ -265,11 +283,15 @@ get_cookies(NNC_Instance inst)
 int
 NNC_PrepareForAuth(NNC_Instance inst)
 {
+  inst->auth_ready = 0;
+
+  /* Try to reload saved keys and cookies (once for the NTS-KE address) */
   if (!inst->load_attempt) {
     load_cookies(inst);
     inst->load_attempt = 1;
   }
 
+  /* Get new cookies if there are not any, or they are no longer usable */
   if (!check_cookies(inst)) {
     if (!get_cookies(inst))
       return 0;
@@ -284,8 +306,11 @@ NNC_PrepareForAuth(NNC_Instance inst)
     return 0;
   }
 
-  UTI_GetRandomBytes(&inst->uniq_id, sizeof (inst->uniq_id));
+  /* Prepare data for NNC_GenerateRequestAuth() */
-  UTI_GetRandomBytes(&inst->nonce, sizeof (inst->nonce));
+  UTI_GetRandomBytes(inst->uniq_id, sizeof (inst->uniq_id));
+  UTI_GetRandomBytes(inst->nonce, sizeof (inst->nonce));
+
+  inst->auth_ready = 1;
 
   return 1;
 }
@@ -300,7 +325,7 @@ NNC_GenerateRequestAuth(NNC_Instance inst, NTP_Packet *packet,
   int i, req_cookies;
   void *ef_body;
 
-  if (inst->num_cookies == 0 || !inst->siv)
+  if (!inst->auth_ready || inst->num_cookies == 0 || !inst->siv)
     return 0;
 
   if (info->mode != MODE_CLIENT)
@@ -311,7 +336,7 @@ NNC_GenerateRequestAuth(NNC_Instance inst, NTP_Packet *packet,
                     MAX_TOTAL_COOKIE_LENGTH / (cookie->length + 4));
 
   if (!NEF_AddField(packet, info, NTP_EF_NTS_UNIQUE_IDENTIFIER,
-                    &inst->uniq_id, sizeof (inst->uniq_id)))
+                    inst->uniq_id, sizeof (inst->uniq_id)))
     return 0;
 
   if (!NEF_AddField(packet, info, NTP_EF_NTS_COOKIE,
@@ -331,6 +356,8 @@ NNC_GenerateRequestAuth(NNC_Instance inst, NTP_Packet *packet,
 
   inst->num_cookies--;
   inst->cookie_index = (inst->cookie_index + 1) % NTS_MAX_COOKIES;
+  inst->auth_ready = 0;
+  inst->nak_response = 0;
   inst->ok_response = 0;
 
   return 1;
@@ -338,6 +365,23 @@ NNC_GenerateRequestAuth(NNC_Instance inst, NTP_Packet *packet,
 
 /* ================================================== */
 
+static int
+parse_encrypted_efs(NNC_Instance inst, unsigned char *plaintext, int length)
+{
+  int ef_length, parsed;
+
+  for (parsed = 0; parsed < length; parsed += ef_length) {
+    if (!NEF_ParseSingleField(plaintext, length, parsed, &ef_length, NULL, NULL, NULL)) {
+      DEBUG_LOG("Could not parse encrypted EF");
+      return 0;
+    }
+  }
+
+  return 1;
+}
+
+/* ================================================== */
+
 static int
 extract_cookies(NNC_Instance inst, unsigned char *plaintext, int length)
 {
@@ -349,7 +393,7 @@ extract_cookies(NNC_Instance inst, unsigned char *plaintext, int length)
   for (parsed = 0; parsed < length; parsed += ef_length) {
     if (!NEF_ParseSingleField(plaintext, length, parsed,
                               &ef_length, &ef_type, &ef_body, &ef_body_length))
-      break;
+      return 0;
 
     if (ef_type != NTP_EF_NTS_COOKIE)
       continue;
@@ -365,6 +409,9 @@ extract_cookies(NNC_Instance inst, unsigned char *plaintext, int length)
       continue;
 
     index = (inst->cookie_index + inst->num_cookies) % NTS_MAX_COOKIES;
+    assert(index >= 0 && index < NTS_MAX_COOKIES);
+    assert(sizeof (inst->cookies) / sizeof (inst->cookies[0]) == NTS_MAX_COOKIES);
+
     memcpy(inst->cookies[index].cookie, ef_body, ef_body_length);
     inst->cookies[index].length = ef_body_length;
     inst->num_cookies++;
@@ -391,8 +438,8 @@ NNC_CheckResponseAuth(NNC_Instance inst, NTP_Packet *packet,
   if (info->ext_fields == 0 || info->mode != MODE_SERVER)
     return 0;
 
-  /* Accept only one response per request */
+  /* Accept at most one response per request */
-  if (inst->ok_response)
+  if (inst->ok_response || inst->auth_ready)
     return 0;
 
   if (!inst->siv ||
@@ -404,7 +451,8 @@ NNC_CheckResponseAuth(NNC_Instance inst, NTP_Packet *packet,
   for (parsed = NTP_HEADER_LENGTH; parsed < info->length; parsed += ef_length) {
     if (!NEF_ParseField(packet, info->length, parsed,
                         &ef_length, &ef_type, &ef_body, &ef_body_length))
-      break;
+      /* This is not expected as the packet already passed NAU_ParsePacket() */
+      return 0;
 
     switch (ef_type) {
       case NTP_EF_NTS_UNIQUE_IDENTIFIER:
@@ -428,6 +476,9 @@ NNC_CheckResponseAuth(NNC_Instance inst, NTP_Packet *packet,
                                plaintext, sizeof (plaintext), &plaintext_length))
           return 0;
 
+        if (!parse_encrypted_efs(inst, plaintext, plaintext_length))
+          return 0;
+
         has_valid_auth = 1;
         break;
       default:
@@ -467,11 +518,6 @@ NNC_ChangeAddress(NNC_Instance inst, IPAddr *address)
 {
   save_cookies(inst);
 
-  if (inst->nke)
-    NKC_DestroyInstance(inst->nke);
-
-  inst->nke = NULL;
-  inst->num_cookies = 0;
   inst->nts_address.ip_addr = *address;
 
   reset_instance(inst);
@@ -507,9 +553,9 @@ save_cookies(NNC_Instance inst)
   context_time = inst->last_nke_success - SCH_GetLastEventMonoTime();
   context_time += UTI_TimespecToDouble(&now);
 
-  if (fprintf(f, "%s%.1f\n%s %d\n%d ",
+  if (fprintf(f, "%s%.1f\n%s %d\n%u %d ",
               DUMP_IDENTIFIER, context_time, UTI_IPToString(&inst->ntp_address->ip_addr),
-              inst->ntp_address->port, (int)inst->context.algorithm) < 0 ||
+              inst->ntp_address->port, inst->context_id, (int)inst->context.algorithm) < 0 ||
       !UTI_BytesToHex(inst->context.s2c.key, inst->context.s2c.length, buf, sizeof (buf)) ||
       fprintf(f, "%s ", buf) < 0 ||
       !UTI_BytesToHex(inst->context.c2s.key, inst->context.c2s.length, buf, sizeof (buf)) ||
@@ -538,12 +584,13 @@ error:
 
 /* ================================================== */
 
-#define MAX_WORDS 3
+#define MAX_WORDS 4
 
 static void
 load_cookies(NNC_Instance inst)
 {
   char line[2 * NKE_MAX_COOKIE_LENGTH + 2], *dump_dir, *filename, *words[MAX_WORDS];
+  unsigned int context_id;
   int i, algorithm, port;
   double context_time;
   struct timespec now;
@@ -573,14 +620,14 @@ load_cookies(NNC_Instance inst)
         sscanf(words[0], "%lf", &context_time) != 1 ||
       !fgets(line, sizeof (line), f) || UTI_SplitString(line, words, MAX_WORDS) != 2 ||
         !UTI_StringToIP(words[0], &ntp_addr.ip_addr) || sscanf(words[1], "%d", &port) != 1 ||
-      !fgets(line, sizeof (line), f) || UTI_SplitString(line, words, MAX_WORDS) != 3 ||
+      !fgets(line, sizeof (line), f) || UTI_SplitString(line, words, MAX_WORDS) != 4 ||
-        sscanf(words[0], "%d", &algorithm) != 1)
+        sscanf(words[0], "%u", &context_id) != 1 || sscanf(words[1], "%d", &algorithm) != 1)
     goto error;
 
   inst->context.algorithm = algorithm;
-  inst->context.s2c.length = UTI_HexToBytes(words[1], inst->context.s2c.key,
+  inst->context.s2c.length = UTI_HexToBytes(words[2], inst->context.s2c.key,
                                             sizeof (inst->context.s2c.key));
-  inst->context.c2s.length = UTI_HexToBytes(words[2], inst->context.c2s.key,
+  inst->context.c2s.length = UTI_HexToBytes(words[3], inst->context.c2s.key,
                                             sizeof (inst->context.c2s.key));
 
   if (inst->context.s2c.length != SIV_GetKeyLength(algorithm) ||
@@ -608,6 +655,7 @@ load_cookies(NNC_Instance inst)
   if (context_time > 0)
     context_time = 0;
   inst->last_nke_success = context_time + SCH_GetLastEventMonoTime();
+  inst->context_id = context_id;
 
   DEBUG_LOG("Loaded %d cookies for %s", i, filename);
   return;
@@ -627,3 +675,21 @@ NNC_DumpData(NNC_Instance inst)
 {
   save_cookies(inst);
 }
+
+/* ================================================== */
+
+void
+NNC_GetReport(NNC_Instance inst, RPT_AuthReport *report)
+{
+  report->key_id = inst->context_id;
+  report->key_type = inst->context.algorithm;
+  report->key_length = 8 * inst->context.s2c.length;
+  report->ke_attempts = inst->nke_attempts;
+  if (report->key_length > 0)
+    report->last_ke_ago = SCH_GetLastEventMonoTime() - inst->last_nke_success;
+  else
+    report->last_ke_ago = -1;
+  report->cookies = inst->num_cookies;
+  report->cookie_length = inst->num_cookies > 0 ? inst->cookies[inst->cookie_index].length : 0;
+  report->nak = inst->nak_response;
+}

nts_ntp_client.h

@@ -29,6 +29,7 @@
 
 #include "addressing.h"
 #include "ntp.h"
+#include "reports.h"
 
 typedef struct NNC_Instance_Record *NNC_Instance;
 
@@ -45,4 +46,6 @@ extern void NNC_ChangeAddress(NNC_Instance inst, IPAddr *address);
 
 extern void NNC_DumpData(NNC_Instance inst);
 
+extern void NNC_GetReport(NNC_Instance inst, RPT_AuthReport *report);
+
 #endif

nts_ntp_server.c

@@ -67,6 +67,8 @@ NNS_Initialise(void)
 
   server = Malloc(sizeof (struct NtsServer));
   server->siv = SIV_CreateInstance(SERVER_SIV);
+  if (!server->siv)
+    LOG_FATAL("Could not initialise SIV cipher");
 }
 
 /* ================================================== */
@@ -110,15 +112,18 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
   for (parsed = NTP_HEADER_LENGTH; parsed < info->length; parsed += ef_length) {
     if (!NEF_ParseField(packet, info->length, parsed,
                         &ef_length, &ef_type, &ef_body, &ef_body_length))
-      break;
+      /* This is not expected as the packet already passed NAU_ParsePacket() */
+      return 0;
 
     switch (ef_type) {
       case NTP_EF_NTS_UNIQUE_IDENTIFIER:
         has_uniq_id = 1;
         break;
       case NTP_EF_NTS_COOKIE:
-        if (has_cookie || ef_body_length > sizeof (cookie.cookie))
+        if (has_cookie || ef_body_length > sizeof (cookie.cookie)) {
+          DEBUG_LOG("Unexpected cookie/length");
           return 0;
+        }
         cookie.length = ef_body_length;
         memcpy(cookie.cookie, ef_body, ef_body_length);
         has_cookie = 1;
@@ -133,6 +138,11 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
         cookie_length = ef_body_length;
         break;
       case NTP_EF_NTS_AUTH_AND_EEF:
+        if (parsed + ef_length != info->length) {
+          DEBUG_LOG("Auth not last EF");
+          return 0;
+        }
+
         auth_start = parsed;
         has_auth = 1;
         break;
@@ -169,8 +179,10 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
 
   for (parsed = 0; parsed < plaintext_length; parsed += ef_length) {
     if (!NEF_ParseSingleField(plaintext, plaintext_length, parsed,
-                              &ef_length, &ef_type, &ef_body, &ef_body_length))
+                              &ef_length, &ef_type, &ef_body, &ef_body_length)) {
-      break;
+      DEBUG_LOG("Could not parse encrypted EF");
+      return 0;
+    }
 
     switch (ef_type) {
       case NTP_EF_NTS_COOKIE_PLACEHOLDER:
@@ -190,13 +202,18 @@ NNS_CheckRequestAuth(NTP_Packet *packet, NTP_PacketInfo *info, uint32_t *kod)
     return 0;
   }
 
+  /* Prepare data for NNS_GenerateResponseAuth() to minimise the time spent
+     there (when the TX timestamp is already set) */
+
   UTI_GetRandomBytes(server->nonce, sizeof (server->nonce));
 
-  server->num_cookies = MIN(NTS_MAX_COOKIES, requested_cookies);
+  assert(sizeof (server->cookies) / sizeof (server->cookies[0]) == NTS_MAX_COOKIES);
-  for (i = 0; i < server->num_cookies; i++)
+  for (i = 0; i < NTS_MAX_COOKIES && i < requested_cookies; i++)
     if (!NKS_GenerateCookie(&context, &server->cookies[i]))
       return 0;
 
+  server->num_cookies = i;
+
   return 1;
 }
 
@@ -215,14 +232,16 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
   if (!server || req_info->mode != MODE_CLIENT || res_info->mode != MODE_SERVER)
     return 0;
 
-  /* Make sure this is a response to the expected request */
+  /* 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);
 
   for (parsed = NTP_HEADER_LENGTH; parsed < req_info->length; parsed += ef_length) {
     if (!NEF_ParseField(request, req_info->length, parsed,
                         &ef_length, &ef_type, &ef_body, &ef_body_length))
-      break;
+      /* This is not expected as the packet already passed NAU_ParsePacket() */
+      return 0;
 
     switch (ef_type) {
       case NTP_EF_NTS_UNIQUE_IDENTIFIER:
@@ -240,7 +259,7 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
 
   for (i = 0, plaintext_length = 0; i < server->num_cookies; i++) {
     if (!NEF_SetField(plaintext, sizeof (plaintext), plaintext_length,
-                      NTP_EF_NTS_COOKIE, &server->cookies[i].cookie,
+                      NTP_EF_NTS_COOKIE, server->cookies[i].cookie,
                       server->cookies[i].length, &ef_length))
       return 0;
 
@@ -250,6 +269,8 @@ NNS_GenerateResponseAuth(NTP_Packet *request, NTP_PacketInfo *req_info,
 
   server->num_cookies = 0;
 
+  /* Generate an authenticator field which will make the length
+     of the response equal to the length of the request */
   if (!NNA_GenerateAuthEF(response, res_info, server->siv,
                           server->nonce, sizeof (server->nonce),
                           plaintext, plaintext_length,

pktlength.c

@@ -110,8 +110,7 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(smoothtime, null),           /* SMOOTHTIME */
   REQ_LENGTH_ENTRY(null, null),                 /* REFRESH */
   REQ_LENGTH_ENTRY(null, server_stats),         /* SERVER_STATS */
-  REQ_LENGTH_ENTRY(client_accesses_by_index,
+  { 0, 0 },                                     /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
-                   client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
   REQ_LENGTH_ENTRY(local, null),                /* LOCAL2 */
   REQ_LENGTH_ENTRY(ntp_data, ntp_data),         /* NTP_DATA */
   { 0, 0 },                                     /* ADD_SERVER2 */
@@ -123,7 +122,12 @@ static const struct request_length request_lengths[] = {
   REQ_LENGTH_ENTRY(ntp_source, null),           /* ADD_SOURCE */
   REQ_LENGTH_ENTRY(ntp_source_name,
                    ntp_source_name),            /* NTP_SOURCE_NAME */
-  REQ_LENGTH_ENTRY(null, null),                 /* RESET */
+  REQ_LENGTH_ENTRY(null, null),                 /* RESET_SOURCES */
+  REQ_LENGTH_ENTRY(auth_data, auth_data),       /* AUTH_DATA */
+  REQ_LENGTH_ENTRY(client_accesses_by_index,
+                   client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX3 */
+  REQ_LENGTH_ENTRY(select_data, select_data),   /* SELECT_DATA */
+  REQ_LENGTH_ENTRY(null, null),                 /* RELOAD_SOURCES */
 };
 
 static const uint16_t reply_lengths[] = {
@@ -141,12 +145,16 @@ static const uint16_t reply_lengths[] = {
   0,                                            /* MANUAL_LIST - not supported */
   RPY_LENGTH_ENTRY(activity),                   /* ACTIVITY */
   RPY_LENGTH_ENTRY(smoothing),                  /* SMOOTHING */
-  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS */
+  0,                                            /* SERVER_STATS - not supported */
-  RPY_LENGTH_ENTRY(client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX2 */
+  0,                                            /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
   RPY_LENGTH_ENTRY(ntp_data),                   /* NTP_DATA */
   RPY_LENGTH_ENTRY(manual_timestamp),           /* MANUAL_TIMESTAMP2 */
   RPY_LENGTH_ENTRY(manual_list),                /* MANUAL_LIST2 */
   RPY_LENGTH_ENTRY(ntp_source_name),            /* NTP_SOURCE_NAME */
+  RPY_LENGTH_ENTRY(auth_data),                  /* AUTH_DATA */
+  RPY_LENGTH_ENTRY(client_accesses_by_index),   /* CLIENT_ACCESSES_BY_INDEX3 */
+  RPY_LENGTH_ENTRY(server_stats),               /* SERVER_STATS2 */
+  RPY_LENGTH_ENTRY(select_data),                /* SELECT_DATA */
 };
 
 /* ================================================== */

refclock.c

@@ -253,8 +253,9 @@ RCL_AddRefclock(RefclockParameters *params)
   inst->filter = SPF_CreateInstance(MIN(params->filter_length, 4), params->filter_length,
                                     params->max_dispersion, 0.6);
 
-  inst->source = SRC_CreateNewInstance(inst->ref_id, SRC_REFCLOCK, params->sel_options, NULL,
+  inst->source = SRC_CreateNewInstance(inst->ref_id, SRC_REFCLOCK, 0, params->sel_options,
-                                       params->min_samples, params->max_samples, 0.0, 0.0);
+                                       NULL, params->min_samples, params->max_samples,
+                                       0.0, 0.0);
 
   DEBUG_LOG("refclock %s refid=%s poll=%d dpoll=%d filter=%d",
       params->driver_name, UTI_RefidToString(inst->ref_id),

reference.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2018
+ * Copyright (C) Miroslav Lichvar  2009-2018, 2020
  * 
  * 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
@@ -304,6 +304,8 @@ REF_Finalise(void)
     update_drift_file(LCL_ReadAbsoluteFrequency(), our_skew);
   }
 
+  LCL_RemoveParameterChangeHandler(handle_slew, NULL);
+
   Free(fb_drifts);
 
   initialised = 0;
@@ -489,8 +491,7 @@ maybe_log_offset(double offset, time_t now)
   abs_offset = fabs(offset);
 
   if (abs_offset > log_change_threshold) {
-    LOG(LOGS_WARN, "System clock wrong by %.6f seconds, adjustment started",
+    LOG(LOGS_WARN, "System clock wrong by %.6f seconds", -offset);
-        -offset);
   }
 
   if (do_mail_change &&
@@ -556,8 +557,7 @@ is_offset_ok(double offset)
     return 1;
   }
 
-  offset = fabs(offset);
+  if (fabs(offset) > max_offset) {
-  if (offset > max_offset) {
     LOG(LOGS_WARN, 
         "Adjustment of %.3f seconds exceeds the allowed maximum of %.3f seconds (%s) ",
         -offset, max_offset, !max_offset_ignore ? "exiting" : "ignored");
@@ -1018,7 +1018,7 @@ REF_SetReference(int stratum, NTP_Leap leap, int combined_sources,
   our_residual_freq = residual_frequency;
   our_root_delay = root_delay;
   our_root_dispersion = root_dispersion;
-  our_frequency_sd = offset_sd;
+  our_frequency_sd = frequency_sd;
   our_offset_sd = offset_sd;
   last_ref_update = mono_now;
   last_ref_update_interval = update_interval;

reports.h

@@ -36,8 +36,14 @@ typedef struct {
   int stratum;
   int poll;
   enum {RPT_NTP_CLIENT, RPT_NTP_PEER, RPT_LOCAL_REFERENCE} mode;
-  enum {RPT_SYNC, RPT_UNREACH, RPT_FALSETICKER, RPT_JITTERY, RPT_CANDIDATE, RPT_OUTLIER} state;
+  enum {
-  int sel_options;
+    RPT_NONSELECTABLE,
+    RPT_FALSETICKER,
+    RPT_JITTERY,
+    RPT_SELECTABLE,
+    RPT_UNSELECTED,
+    RPT_SELECTED,
+  } state;
 
   int reachability;
   unsigned long latest_meas_ago; /* seconds */
@@ -78,8 +84,8 @@ typedef struct {
 
 typedef struct {
   struct timespec ref_time;
-  unsigned short n_samples;
+  unsigned long n_samples;
-  unsigned short n_runs;
+  unsigned long n_runs;
   unsigned long span_seconds;
   double rtc_seconds_fast;
   double rtc_gain_rate_ppm;
@@ -88,22 +94,29 @@ typedef struct {
 typedef struct {
   IPAddr ip_addr;
   uint32_t ntp_hits;
+  uint32_t nke_hits;
   uint32_t cmd_hits;
   uint16_t ntp_drops;
+  uint16_t nke_drops;
   uint16_t cmd_drops;
   int8_t ntp_interval;
+  int8_t nke_interval;
   int8_t cmd_interval;
   int8_t ntp_timeout_interval;
   uint32_t last_ntp_hit_ago;
+  uint32_t last_nke_hit_ago;
   uint32_t last_cmd_hit_ago;
 } RPT_ClientAccessByIndex_Report;
 
 typedef struct {
   uint32_t ntp_hits;
+  uint32_t nke_hits;
   uint32_t cmd_hits;
   uint32_t ntp_drops;
+  uint32_t nke_drops;
   uint32_t cmd_drops;
   uint32_t log_drops;
+  uint32_t ntp_auth_hits;
 } RPT_ServerStatsReport;
 
 typedef struct {
@@ -160,4 +173,29 @@ typedef struct {
   uint32_t total_valid_count;
 } RPT_NTPReport;
 
+typedef struct {
+  NTP_AuthMode mode;
+  uint32_t key_id;
+  int key_type;
+  int key_length;
+  int ke_attempts;
+  uint32_t last_ke_ago;
+  int cookies;
+  int cookie_length;
+  int nak;
+} RPT_AuthReport;
+
+typedef struct {
+  uint32_t ref_id;
+  IPAddr ip_addr;
+  char state_char;
+  int authentication;
+  int conf_options;
+  int eff_options;
+  uint32_t last_sample_ago;
+  double score;
+  double lo_limit;
+  double hi_limit;
+} RPT_SelectReport;
+
 #endif /* GOT_REPORTS_H */

rtc_linux.c

@@ -573,6 +573,10 @@ RTC_Linux_Finalise(void)
     (void) RTC_Linux_WriteParameters();
 
   }
+
+  if (rtc_sec)
+    LCL_RemoveParameterChangeHandler(slew_samples, NULL);
+
   Free(rtc_sec);
   Free(rtc_trim);
   Free(system_times);

sched.c

@@ -490,20 +490,6 @@ SCH_RemoveTimeout(SCH_TimeoutID id)
   assert(0);
 }
 
-/* ================================================== */
-
-void
-SCH_Reset(void)
-{
-  while (n_timer_queue_entries > 0)
-    SCH_RemoveTimeout(timer_queue.next->id);
-
-  while (one_highest_fd > 0) {
-    close(one_highest_fd - 1);
-    SCH_RemoveFileHandler(one_highest_fd - 1);
-  }
-}
-
 /* ================================================== */
 /* Try to dispatch any timeouts that have already gone by, and
    keep going until all are done.  (The earlier ones may take so

sched.h

@@ -85,9 +85,6 @@ extern SCH_TimeoutID SCH_AddTimeoutInClass(double min_delay, double separation,
 /* The next one probably ought to return a status code */
 extern void SCH_RemoveTimeout(SCH_TimeoutID);
 
-/* Remove all timeouts and close all file descriptors */
-extern void SCH_Reset(void);
-
 extern void SCH_MainLoop(void);
 
 extern void SCH_QuitProgram(void);

siv_gnutls.c

@@ -0,0 +1,256 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2020
+ *
+ * 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.
+ *
+ **********************************************************************
+
+  =======================================================================
+
+  SIV ciphers using the GnuTLS library
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include <gnutls/crypto.h>
+
+#include "logging.h"
+#include "memory.h"
+#include "siv.h"
+
+struct SIV_Instance_Record {
+  gnutls_cipher_algorithm_t algorithm;
+  gnutls_aead_cipher_hd_t cipher;
+};
+
+/* ================================================== */
+
+static int instance_counter = 0;
+static int gnutls_initialised = 0;
+
+/* ================================================== */
+
+static void
+init_gnutls(void)
+{
+  int r;
+
+  if (gnutls_initialised)
+    return;
+
+  r = gnutls_global_init();
+  if (r < 0)
+    LOG_FATAL("Could not initialise %s : %s", "gnutls", gnutls_strerror(r));
+
+  DEBUG_LOG("Initialised");
+  gnutls_initialised = 1;
+}
+
+/* ================================================== */
+
+static void
+deinit_gnutls(void)
+{
+  assert(gnutls_initialised);
+  gnutls_global_deinit();
+  gnutls_initialised = 0;
+  DEBUG_LOG("Deinitialised");
+}
+
+/* ================================================== */
+
+static gnutls_cipher_algorithm_t
+get_cipher_algorithm(SIV_Algorithm algorithm)
+{
+  switch (algorithm) {
+    case AEAD_AES_SIV_CMAC_256:
+      return GNUTLS_CIPHER_AES_128_SIV;
+    default:
+      return 0;
+  }
+}
+
+/* ================================================== */
+
+SIV_Instance
+SIV_CreateInstance(SIV_Algorithm algorithm)
+{
+  gnutls_cipher_algorithm_t calgo;
+  SIV_Instance instance;
+
+  calgo = get_cipher_algorithm(algorithm);
+  if (calgo == 0)
+    return NULL;
+
+  if (instance_counter == 0)
+    init_gnutls();
+
+  /* Check if the cipher is actually supported */
+  if (gnutls_cipher_get_tag_size(calgo) == 0)
+    return NULL;
+
+  instance = MallocNew(struct SIV_Instance_Record);
+  instance->algorithm = calgo;
+  instance->cipher = NULL;
+
+  instance_counter++;
+
+  return instance;
+}
+
+/* ================================================== */
+
+void
+SIV_DestroyInstance(SIV_Instance instance)
+{
+  if (instance->cipher)
+    gnutls_aead_cipher_deinit(instance->cipher);
+  Free(instance);
+
+  instance_counter--;
+  if (instance_counter == 0)
+    deinit_gnutls();
+}
+
+/* ================================================== */
+
+int
+SIV_GetKeyLength(SIV_Algorithm algorithm)
+{
+  gnutls_cipher_algorithm_t calgo = get_cipher_algorithm(algorithm);
+  int len;
+
+  if (calgo == 0)
+    return 0;
+
+  len = gnutls_cipher_get_key_size(calgo);
+
+  if (len < 1 || len > SIV_MAX_KEY_LENGTH)
+    LOG_FATAL("Invalid key length");
+
+  return len;
+}
+
+/* ================================================== */
+
+int
+SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
+{
+  gnutls_aead_cipher_hd_t cipher;
+  gnutls_datum_t datum;
+  int r;
+
+  if (length <= 0 || length != gnutls_cipher_get_key_size(instance->algorithm))
+    return 0;
+
+  datum.data = (unsigned char *)key;
+  datum.size = length;
+
+  /* Initialise a new cipher with the provided key (gnutls does not seem to
+     have a function to change the key directly) */
+  r = gnutls_aead_cipher_init(&cipher, instance->algorithm, &datum);
+  if (r < 0) {
+    DEBUG_LOG("Could not initialise %s : %s", "cipher", gnutls_strerror(r));
+    return 0;
+  }
+
+  /* Replace the previous cipher */
+  if (instance->cipher)
+    gnutls_aead_cipher_deinit(instance->cipher);
+  instance->cipher = cipher;
+
+  return 1;
+}
+
+/* ================================================== */
+
+int
+SIV_GetTagLength(SIV_Instance instance)
+{
+  int len;
+
+  len = gnutls_cipher_get_tag_size(instance->algorithm);
+
+  if (len < 1 || len > SIV_MAX_TAG_LENGTH)
+    LOG_FATAL("Invalid tag length");
+
+  return len;
+}
+
+/* ================================================== */
+
+int
+SIV_Encrypt(SIV_Instance instance,
+            const unsigned char *nonce, int nonce_length,
+            const void *assoc, int assoc_length,
+            const void *plaintext, int plaintext_length,
+            unsigned char *ciphertext, int ciphertext_length)
+{
+  size_t clen = ciphertext_length;
+
+  if (!instance->cipher)
+    return 0;
+
+  if (nonce_length < 1 || assoc_length < 0 ||
+      plaintext_length < 0 || ciphertext_length < 0)
+    return 0;
+
+  assert(assoc && plaintext);
+
+  if (gnutls_aead_cipher_encrypt(instance->cipher,
+                                 nonce, nonce_length, assoc, assoc_length, 0,
+                                 plaintext, plaintext_length, ciphertext, &clen) < 0)
+    return 0;
+
+  if (clen != ciphertext_length)
+    return 0;
+
+  return 1;
+}
+
+/* ================================================== */
+
+int
+SIV_Decrypt(SIV_Instance instance,
+            const unsigned char *nonce, int nonce_length,
+            const void *assoc, int assoc_length,
+            const unsigned char *ciphertext, int ciphertext_length,
+            void *plaintext, int plaintext_length)
+{
+  size_t plen = plaintext_length;
+
+  if (!instance->cipher)
+    return 0;
+
+  if (nonce_length < 1 || assoc_length < 0 ||
+      plaintext_length < 0 || ciphertext_length < 0)
+    return 0;
+
+  assert(assoc && plaintext);
+
+  if (gnutls_aead_cipher_decrypt(instance->cipher,
+                                 nonce, nonce_length, assoc, assoc_length, 0,
+                                 ciphertext, ciphertext_length, plaintext, &plen) < 0)
+    return 0;
+
+  if (plen != plaintext_length)
+    return 0;
+
+  return 1;
+}

siv_nettle.c

@@ -39,6 +39,7 @@
 
 struct SIV_Instance_Record {
   struct siv_cmac_aes128_ctx siv;
+  int key_set;
 };
 
 /* ================================================== */
@@ -52,6 +53,7 @@ SIV_CreateInstance(SIV_Algorithm algorithm)
     return NULL;
 
   instance = MallocNew(struct SIV_Instance_Record);
+  instance->key_set = 0;
 
   return instance;
 }
@@ -69,6 +71,8 @@ SIV_DestroyInstance(SIV_Instance instance)
 int
 SIV_GetKeyLength(SIV_Algorithm algorithm)
 {
+  assert(32 <= SIV_MAX_KEY_LENGTH);
+
   if (algorithm == AEAD_AES_SIV_CMAC_256)
     return 32;
   return 0;
@@ -84,6 +88,8 @@ SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
 
   siv_cmac_aes128_set_key(&instance->siv, key);
 
+  instance->key_set = 1;
+
   return 1;
 }
 
@@ -92,6 +98,8 @@ SIV_SetKey(SIV_Instance instance, const unsigned char *key, int length)
 int
 SIV_GetTagLength(SIV_Instance instance)
 {
+  assert(SIV_DIGEST_SIZE <= SIV_MAX_TAG_LENGTH);
+
   return SIV_DIGEST_SIZE;
 }
 
@@ -104,6 +112,9 @@ SIV_Encrypt(SIV_Instance instance,
             const void *plaintext, int plaintext_length,
             unsigned char *ciphertext, int ciphertext_length)
 {
+  if (!instance->key_set)
+    return 0;
+
   if (nonce_length < SIV_MIN_NONCE_SIZE || assoc_length < 0 ||
       plaintext_length < 0 || plaintext_length > ciphertext_length ||
       plaintext_length + SIV_DIGEST_SIZE != ciphertext_length)
@@ -126,6 +137,9 @@ SIV_Decrypt(SIV_Instance instance,
             const unsigned char *ciphertext, int ciphertext_length,
             void *plaintext, int plaintext_length)
 {
+  if (!instance->key_set)
+    return 0;
+
   if (nonce_length < SIV_MIN_NONCE_SIZE || assoc_length < 0 ||
       plaintext_length < 0 || plaintext_length > ciphertext_length ||
       plaintext_length + SIV_DIGEST_SIZE != ciphertext_length)

smooth.c

@@ -272,6 +272,10 @@ void SMT_Initialise(void)
 
 void SMT_Finalise(void)
 {
+  if (!enabled)
+    return;
+
+  LCL_RemoveParameterChangeHandler(handle_slew, NULL);
 }
 
 int SMT_IsEnabled(void)

socket.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Timo Teras  2009
- * Copyright (C) Miroslav Lichvar  2009, 2013-2019
+ * Copyright (C) Miroslav Lichvar  2009, 2013-2020
  * 
  * 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
@@ -82,6 +82,10 @@ struct MessageHeader {
 
 static int initialised;
 
+/* Flags indicating in which IP families sockets can be requested */
+static int ip4_enabled;
+static int ip6_enabled;
+
 /* Flags supported by socket() */
 static int supported_socket_flags;
 
@@ -114,7 +118,7 @@ prepare_buffers(unsigned int n)
     hdr->msg_hdr.msg_namelen = sizeof (msg->name);
     hdr->msg_hdr.msg_iov = &msg->iov;
     hdr->msg_hdr.msg_iovlen = 1;
-    hdr->msg_hdr.msg_control = &msg->cmsg_buf;
+    hdr->msg_hdr.msg_control = msg->cmsg_buf;
     hdr->msg_hdr.msg_controllen = sizeof (msg->cmsg_buf);
     hdr->msg_hdr.msg_flags = 0;
     hdr->msg_len = 0;
@@ -172,7 +176,7 @@ check_socket_flag(int sock_flag, int fd_flag, int fs_flag)
 static int
 set_socket_nonblock(int sock_fd)
 {
-  if (fcntl(sock_fd, F_SETFL, O_NONBLOCK)) {
+  if (fcntl(sock_fd, F_SETFL, O_NONBLOCK) < 0) {
     DEBUG_LOG("Could not set O_NONBLOCK : %s", strerror(errno));
     return 0;
   }
@@ -332,6 +336,23 @@ is_any_address(IPAddr *addr)
 
 /* ================================================== */
 
+static int
+bind_device(int sock_fd, const char *iface)
+{
+#ifdef SO_BINDTODEVICE
+  if (setsockopt(sock_fd, SOL_SOCKET, SO_BINDTODEVICE, iface, strlen(iface) + 1) < 0) {
+    DEBUG_LOG("Could not bind socket to %s : %s", iface, strerror(errno));
+    return 0;
+  }
+  return 1;
+#else
+  DEBUG_LOG("Could not bind socket to %s : %s", iface, "Not supported");
+  return 0;
+#endif
+}
+
+/* ================================================== */
+
 static int
 bind_ip_address(int sock_fd, IPSockAddr *addr, int flags)
 {
@@ -399,7 +420,8 @@ connect_ip_address(int sock_fd, IPSockAddr *addr)
 /* ================================================== */
 
 static int
-open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int type, int flags)
+open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface,
+               int type, int flags)
 {
   int domain, family, sock_fd;
 
@@ -412,10 +434,14 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int type, int fl
 
   switch (family) {
     case IPADDR_INET4:
+      if (!ip4_enabled)
+        return INVALID_SOCK_FD;
       domain = AF_INET;
       break;
 #ifdef FEAT_IPV6
     case IPADDR_INET6:
+      if (!ip6_enabled)
+        return INVALID_SOCK_FD;
       domain = AF_INET6;
       break;
 #endif
@@ -434,6 +460,9 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int type, int fl
   if (!set_ip_options(sock_fd, family, flags))
     goto error;
 
+  if (iface && !bind_device(sock_fd, iface))
+    goto error;
+
   /* Bind the socket if a non-any local address/port was specified */
   if (local_addr && local_addr->ip_addr.family != IPADDR_UNSPEC &&
       (local_addr->port != 0 || !is_any_address(&local_addr->ip_addr)) &&
@@ -476,8 +505,8 @@ bind_unix_address(int sock_fd, const char *addr, int flags)
   }
   saddr.un.sun_family = AF_UNIX;
 
-  if (!UTI_RemoveFile(NULL, addr, NULL))
+  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) {
@@ -627,9 +656,8 @@ log_message(int sock_fd, int direction, SCK_Message *message, const char *prefix
     case SCK_ADDR_IP:
       if (message->remote_addr.ip.ip_addr.family != IPADDR_UNSPEC)
         remote_addr = UTI_IPSockAddrToString(&message->remote_addr.ip);
-      if (message->local_addr.ip.family != IPADDR_UNSPEC) {
+      if (message->local_addr.ip.family != IPADDR_UNSPEC)
         local_addr = UTI_IPToString(&message->local_addr.ip);
-      }
       break;
     case SCK_ADDR_UNIX:
       remote_addr = message->remote_addr.path;
@@ -655,7 +683,7 @@ log_message(int sock_fd, int direction, SCK_Message *message, const char *prefix
       snprintf(tslen, sizeof (tslen), " tslen=%d", message->timestamp.l2_length);
   }
 
-  DEBUG_LOG("%s message%s%s%s%s fd=%d len=%u%s%s%s%s%s%s",
+  DEBUG_LOG("%s message%s%s%s%s fd=%d len=%d%s%s%s%s%s%s",
             prefix,
             remote_addr ? (direction > 0 ? " from " : " to ") : "",
             remote_addr ? remote_addr : "",
@@ -710,7 +738,7 @@ init_message_nonaddress(SCK_Message *message)
 /* ================================================== */
 
 static int
-process_header(struct msghdr *msg, unsigned int msg_length, int sock_fd, int flags,
+process_header(struct msghdr *msg, int msg_length, int sock_fd, int flags,
                SCK_Message *message)
 {
   struct cmsghdr *cmsg;
@@ -892,7 +920,10 @@ receive_messages(int sock_fd, int flags, int max_messages, int *num_messages)
   hdr = ARR_GetElements(recv_headers);
   n = ARR_GetSize(recv_headers);
   n = MIN(n, max_messages);
-  assert(n >= 1);
+
+  if (n < 1 || n > MAX_RECV_MESSAGES ||
+      n > ARR_GetSize(recv_messages) || n > ARR_GetSize(recv_sck_messages))
+    assert(0);
 
   recv_flags = get_recv_flags(flags);
 
@@ -1001,6 +1032,11 @@ send_message(int sock_fd, SCK_Message *message, int flags)
     msg.msg_namelen = 0;
   }
 
+  if (message->length < 0) {
+    DEBUG_LOG("Invalid length %d", message->length);
+    return 0;
+  }
+
   iov.iov_base = message->data;
   iov.iov_len = message->length;
   msg.msg_iov = &iov;
@@ -1094,8 +1130,15 @@ send_message(int sock_fd, SCK_Message *message, int flags)
 /* ================================================== */
 
 void
-SCK_Initialise(void)
+SCK_Initialise(int family)
 {
+  ip4_enabled = family == IPADDR_INET4 || family == IPADDR_UNSPEC;
+#ifdef FEAT_IPV6
+  ip6_enabled = family == IPADDR_INET6 || family == IPADDR_UNSPEC;
+#else
+  ip6_enabled = 0;
+#endif
+
   recv_messages = ARR_CreateInstance(sizeof (struct Message));
   ARR_SetSize(recv_messages, MAX_RECV_MESSAGES);
   recv_headers = ARR_CreateInstance(sizeof (struct MessageHeader));
@@ -1135,15 +1178,13 @@ SCK_Finalise(void)
 /* ================================================== */
 
 int
-SCK_IsFamilySupported(int family)
+SCK_IsIpFamilyEnabled(int family)
 {
   switch (family) {
     case IPADDR_INET4:
-      return 1;
+      return ip4_enabled;
     case IPADDR_INET6:
-#ifdef FEAT_IPV6
+      return ip6_enabled;
-      return 1;
-#endif
     default:
       return 0;
   }
@@ -1194,6 +1235,23 @@ SCK_GetLoopbackIPAddress(int family, IPAddr *local_addr)
 
 /* ================================================== */
 
+int
+SCK_IsLinkLocalIPAddress(IPAddr *addr)
+{
+  switch (addr->family) {
+    case IPADDR_INET4:
+      /* 169.254.0.0/16 */
+      return (addr->addr.in4 & 0xffff0000) == 0xa9fe0000;
+    case IPADDR_INET6:
+      /* fe80::/10 */
+      return addr->addr.in6[0] == 0xfe && (addr->addr.in6[1] & 0xc0) == 0x80;
+    default:
+      return 0;
+  }
+}
+
+/* ================================================== */
+
 void
 SCK_SetPrivBind(int (*function)(int sock_fd, struct sockaddr *address,
                                 socklen_t address_len))
@@ -1204,17 +1262,17 @@ SCK_SetPrivBind(int (*function)(int sock_fd, struct sockaddr *address,
 /* ================================================== */
 
 int
-SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags)
+SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface, int flags)
 {
-  return open_ip_socket(remote_addr, local_addr, SOCK_DGRAM, flags);
+  return open_ip_socket(remote_addr, local_addr, iface, SOCK_DGRAM, flags);
 }
 
 /* ================================================== */
 
 int
-SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags)
+SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface, int flags)
 {
-  return open_ip_socket(remote_addr, local_addr, SOCK_STREAM, flags);
+  return open_ip_socket(remote_addr, local_addr, iface, SOCK_STREAM, flags);
 }
 
 /* ================================================== */
@@ -1353,10 +1411,15 @@ SCK_ShutdownConnection(int sock_fd)
 /* ================================================== */
 
 int
-SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags)
+SCK_Receive(int sock_fd, void *buffer, int length, int flags)
 {
   int r;
 
+  if (length < 0) {
+    DEBUG_LOG("Invalid length %d", length);
+    return -1;
+  }
+
   r = recv(sock_fd, buffer, length, get_recv_flags(flags));
 
   if (r < 0) {
@@ -1372,16 +1435,21 @@ SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags)
 /* ================================================== */
 
 int
-SCK_Send(int sock_fd, const void *buffer, unsigned int length, int flags)
+SCK_Send(int sock_fd, const void *buffer, int length, int flags)
 {
   int r;
 
   assert(flags == 0);
 
+  if (length < 0) {
+    DEBUG_LOG("Invalid length %d", length);
+    return -1;
+  }
+
   r = send(sock_fd, buffer, length, 0);
 
   if (r < 0) {
-    DEBUG_LOG("Could not send data fd=%d len=%u : %s", sock_fd, length, strerror(errno));
+    DEBUG_LOG("Could not send data fd=%d len=%d : %s", sock_fd, length, strerror(errno));
     return r;
   }
 
@@ -1444,8 +1512,10 @@ SCK_RemoveSocket(int sock_fd)
       saddr.sa.sa_family != AF_UNIX)
     return 0;
 
-  if (!UTI_RemoveFile(NULL, saddr.un.sun_path, NULL))
+  if (unlink(saddr.un.sun_path) < 0) {
+    DEBUG_LOG("Could not remove %s : %s", saddr.un.sun_path, strerror(errno));
     return 0;
+  }
 
   return 1;
 }
@@ -1468,7 +1538,7 @@ SCK_SockaddrToIPSockAddr(struct sockaddr *sa, int sa_length, IPSockAddr *ip_sa)
 
   switch (sa->sa_family) {
     case AF_INET:
-      if (sa_length < sizeof (struct sockaddr_in))
+      if (sa_length < (int)sizeof (struct sockaddr_in))
         return;
       ip_sa->ip_addr.family = IPADDR_INET4;
       ip_sa->ip_addr.addr.in4 = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr);
@@ -1476,7 +1546,7 @@ SCK_SockaddrToIPSockAddr(struct sockaddr *sa, int sa_length, IPSockAddr *ip_sa)
       break;
 #ifdef FEAT_IPV6
     case AF_INET6:
-      if (sa_length < sizeof (struct sockaddr_in6))
+      if (sa_length < (int)sizeof (struct sockaddr_in6))
         return;
       ip_sa->ip_addr.family = IPADDR_INET6;
       memcpy(&ip_sa->ip_addr.addr.in6, ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr,
@@ -1496,7 +1566,7 @@ SCK_IPSockAddrToSockaddr(IPSockAddr *ip_sa, struct sockaddr *sa, int sa_length)
 {
   switch (ip_sa->ip_addr.family) {
     case IPADDR_INET4:
-      if (sa_length < sizeof (struct sockaddr_in))
+      if (sa_length < (int)sizeof (struct sockaddr_in))
         return 0;
       memset(sa, 0, sizeof (struct sockaddr_in));
       sa->sa_family = AF_INET;
@@ -1508,7 +1578,7 @@ SCK_IPSockAddrToSockaddr(IPSockAddr *ip_sa, struct sockaddr *sa, int sa_length)
       return sizeof (struct sockaddr_in);
 #ifdef FEAT_IPV6
     case IPADDR_INET6:
-      if (sa_length < sizeof (struct sockaddr_in6))
+      if (sa_length < (int)sizeof (struct sockaddr_in6))
         return 0;
       memset(sa, 0, sizeof (struct sockaddr_in6));
       sa->sa_family = AF_INET6;
@@ -1521,7 +1591,7 @@ SCK_IPSockAddrToSockaddr(IPSockAddr *ip_sa, struct sockaddr *sa, int sa_length)
       return sizeof (struct sockaddr_in6);
 #endif
     default:
-      if (sa_length < sizeof (struct sockaddr))
+      if (sa_length < (int)sizeof (struct sockaddr))
         return 0;
       memset(sa, 0, sizeof (struct sockaddr));
       sa->sa_family = AF_UNSPEC;

socket.h

@@ -49,7 +49,7 @@ typedef enum {
 
 typedef struct {
   void *data;
-  unsigned int length;
+  int length;
   SCK_AddressType addr_type;
   int if_index;
 
@@ -73,27 +73,33 @@ typedef struct {
   int descriptor;
 } SCK_Message;
 
-/* Initialisation function */
+/* Initialisation function (the specified IP family is enabled,
-extern void SCK_Initialise(void);
+   or all if IPADDR_UNSPEC) */
+extern void SCK_Initialise(int family);
 
 /* Finalisation function */
 extern void SCK_Finalise(void);
 
-/* Check if support for the IP family was enabled in the build */
+/* Check if support for the IP family is enabled */
-extern int SCK_IsFamilySupported(int family);
+extern int SCK_IsIpFamilyEnabled(int family);
 
 /* Get the 0.0.0.0/::0 or 127.0.0.1/::1 address */
 extern void SCK_GetAnyLocalIPAddress(int family, IPAddr *local_addr);
 extern void SCK_GetLoopbackIPAddress(int family, IPAddr *local_addr);
 
+/* Check if an IP address is a link-local address */
+extern int SCK_IsLinkLocalIPAddress(IPAddr *addr);
+
 /* Specify a bind()-like function for binding sockets to privileged ports when
    running in a restricted process (e.g. after dropping root privileges) */
 extern void SCK_SetPrivBind(int (*function)(int sock_fd, struct sockaddr *address,
                                             socklen_t address_len));
 
-/* Open socket */
+/* Open a socket (addresses and iface may be NULL) */
-extern int SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags);
+extern int SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr,
-extern int SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags);
+                             const char *iface, int flags);
+extern int SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr,
+                             const char *iface, int flags);
 extern int SCK_OpenUnixDatagramSocket(const char *remote_addr, const char *local_addr,
                                       int flags);
 extern int SCK_OpenUnixStreamSocket(const char *remote_addr, const char *local_addr,
@@ -113,8 +119,8 @@ extern int SCK_AcceptConnection(int sock_fd, IPSockAddr *remote_addr);
 extern int SCK_ShutdownConnection(int sock_fd);
 
 /* Receive and send data on connected sockets - recv()/send() wrappers */
-extern int SCK_Receive(int sock_fd, void *buffer, unsigned int length, int flags);
+extern int SCK_Receive(int sock_fd, void *buffer, int length, int flags);
-extern int SCK_Send(int sock_fd, const void *buffer, unsigned int length, int flags);
+extern int SCK_Send(int sock_fd, const void *buffer, int length, int flags);
 
 /* Receive a single message or multiple messages.  The functions return
    a pointer to static buffers, or NULL on error.  The buffers are valid until

sources.c

@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2016, 2018
+ * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020
  * 
  * 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
@@ -118,7 +118,13 @@ struct SRC_Instance_Record {
   /* Type of the source */
   SRC_Type type;
 
-  /* Options used when selecting sources */ 
+  /* Flag indicating that the source is authenticated */
+  int authenticated;
+
+  /* Configured selection options */
+  int conf_sel_options;
+
+  /* Effective selection options */
   int sel_options;
 
   /* Score against currently selected source */
@@ -172,13 +178,11 @@ static double combine_limit;
 /* ================================================== */
 /* Forward prototype */
 
-static void
+static void update_sel_options(void);
-slew_sources(struct timespec *raw, struct timespec *cooked, double dfreq,
+static void slew_sources(struct timespec *raw, struct timespec *cooked, double dfreq,
-             double doffset, LCL_ChangeType change_type, void *anything);
+                         double doffset, LCL_ChangeType change_type, void *anything);
-static void
+static void add_dispersion(double dispersion, void *anything);
-add_dispersion(double dispersion, void *anything);
+static char *source_to_string(SRC_Instance inst);
-static char *
-source_to_string(SRC_Instance inst);
 
 /* ================================================== */
 /* Initialisation function */
@@ -218,9 +222,9 @@ void SRC_Finalise(void)
 /* Function to create a new instance.  This would be called by one of
    the individual source-type instance creation routines. */
 
-SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_options,
+SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int authenticated,
-                                   IPAddr *addr, int min_samples, int max_samples,
+                                   int sel_options, IPAddr *addr, int min_samples,
-                                   double min_delay, double asymmetry)
+                                   int max_samples, double min_delay, double asymmetry)
 {
   SRC_Instance result;
 
@@ -253,6 +257,8 @@ SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_optio
 
   result->index = n_sources;
   result->type = type;
+  result->authenticated = authenticated;
+  result->conf_sel_options = sel_options;
   result->sel_options = sel_options;
   result->active = 0;
 
@@ -261,6 +267,8 @@ SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_optio
 
   n_sources++;
 
+  update_sel_options();
+
   return result;
 }
 
@@ -285,6 +293,8 @@ void SRC_DestroyInstance(SRC_Instance instance)
   --n_sources;
   Free(instance);
 
+  update_sel_options();
+
   /* If this was the previous reference source, we have to reselect! */
   if (selected_source_index == dead_index)
     SRC_ReselectSource();
@@ -306,6 +316,8 @@ SRC_ResetInstance(SRC_Instance instance)
   instance->leap = LEAP_Unsynchronised;
   instance->leap_vote = 0;
 
+  memset(&instance->sel_info, 0, sizeof (instance->sel_info));
+
   SST_ResetInstance(instance->stats);
 }
 
@@ -386,7 +398,7 @@ SRC_AccumulateSample(SRC_Instance inst, NTP_Sample *sample)
 
   assert(initialised);
 
-  DEBUG_LOG("ip=[%s] t=%s ofs=%f del=%f disp=%f str=%d",
+  DEBUG_LOG("src=%s ts=%s offset=%e delay=%e disp=%e stratum=%d",
             source_to_string(inst), UTI_TimespecToString(&sample->time), -sample->offset,
             sample->root_delay, sample->root_dispersion, sample->stratum);
 
@@ -427,7 +439,7 @@ special_mode_end(void)
       if (!sources[i]->active)
         continue;
 
-      /* Don't expect more updates than from an offline iburst NTP source */
+      /* Don't expect more updates than the initial burst of an NTP source */
       if (sources[i]->reachability_size >= SOURCE_REACH_BITS - 1)
         continue;
 
@@ -482,6 +494,75 @@ SRC_ResetReachability(SRC_Instance inst)
 
 /* ================================================== */
 
+static void
+update_sel_options(void)
+{
+  int options, auth_ntp_options, unauth_ntp_options, refclk_options;
+  int i, auth_ntp_sources, unauth_ntp_sources;
+
+  auth_ntp_sources = unauth_ntp_sources = 0;
+
+  for (i = 0; i < n_sources; i++) {
+    if (sources[i]->conf_sel_options & SRC_SELECT_NOSELECT)
+      continue;
+    if (sources[i]->type != SRC_NTP)
+      continue;
+    if (sources[i]->authenticated)
+      auth_ntp_sources++;
+    else
+      unauth_ntp_sources++;
+  }
+
+  auth_ntp_options = unauth_ntp_options = refclk_options = 0;
+
+  /* Determine which selection options need to be added to authenticated NTP
+     sources, unauthenticated NTP sources, and refclocks, to follow the
+     configured selection mode */
+  switch (CNF_GetAuthSelectMode()) {
+    case SRC_AUTHSELECT_IGNORE:
+      break;
+    case SRC_AUTHSELECT_MIX:
+      if (auth_ntp_sources > 0 && unauth_ntp_sources > 0)
+        auth_ntp_options = refclk_options = SRC_SELECT_REQUIRE | SRC_SELECT_TRUST;
+      break;
+    case SRC_AUTHSELECT_PREFER:
+      if (auth_ntp_sources > 0)
+        unauth_ntp_options = SRC_SELECT_NOSELECT;
+      break;
+    case SRC_AUTHSELECT_REQUIRE:
+      unauth_ntp_options = SRC_SELECT_NOSELECT;
+      break;
+    default:
+      assert(0);
+  }
+
+  for (i = 0; i < n_sources; i++) {
+    options = sources[i]->conf_sel_options;
+
+    if (options & SRC_SELECT_NOSELECT)
+      continue;
+
+    switch (sources[i]->type) {
+      case SRC_NTP:
+        options |= sources[i]->authenticated ? auth_ntp_options : unauth_ntp_options;
+        break;
+      case SRC_REFCLOCK:
+        options |= refclk_options;
+        break;
+      default:
+        assert(0);
+    }
+
+    if (sources[i]->sel_options != options) {
+      DEBUG_LOG("changing %s from %x to %x", source_to_string(sources[i]),
+                (unsigned int)sources[i]->sel_options, (unsigned int)options);
+      sources[i]->sel_options = options;
+    }
+  }
+}
+
+/* ================================================== */
+
 static void
 log_selection_message(const char *format, const char *arg)
 {
@@ -492,6 +573,24 @@ log_selection_message(const char *format, const char *arg)
 
 /* ================================================== */
 
+static void
+log_selection_source(const char *format, SRC_Instance inst)
+{
+  char buf[320], *name, *ntp_name;
+
+  name = source_to_string(inst);
+  ntp_name = inst->type == SRC_NTP ? NSR_GetName(inst->ip_addr) : NULL;
+
+  if (ntp_name && strcmp(name, ntp_name) != 0)
+    snprintf(buf, sizeof (buf), "%s (%s)", name, ntp_name);
+  else
+    snprintf(buf, sizeof (buf), "%s", name);
+
+  log_selection_message(format, buf);
+}
+
+/* ================================================== */
+
 static int
 compare_sort_elements(const void *a, const void *b)
 {
@@ -529,6 +628,20 @@ source_to_string(SRC_Instance inst)
 
 /* ================================================== */
 
+static void
+mark_source(SRC_Instance inst, SRC_Status status)
+{
+  inst->status = status;
+
+  DEBUG_LOG("%s status=%d options=%x reach=%o/%d updates=%d distant=%d leap=%d vote=%d lo=%f hi=%f",
+            source_to_string(inst), (int)inst->status, (unsigned int)inst->sel_options,
+            (unsigned int)inst->reachability, inst->reachability_size, inst->updates,
+            inst->distant, (int)inst->leap, inst->leap_vote,
+            inst->sel_info.lo_limit, inst->sel_info.hi_limit);
+}
+
+/* ================================================== */
+
 static void
 mark_ok_sources(SRC_Status status)
 {
@@ -537,7 +650,7 @@ mark_ok_sources(SRC_Status status)
   for (i = 0; i < n_sources; i++) {
     if (sources[i]->status != SRC_OK)
       continue;
-    sources[i]->status = status;
+    mark_source(sources[i], status);
   }
 }
 
@@ -588,12 +701,12 @@ combine_sources(int n_sel_sources, struct timespec *ref_time, double *offset,
     }
 
     if (sources[index]->distant) {
-      sources[index]->status = SRC_DISTANT;
+      mark_source(sources[index], SRC_DISTANT);
       continue;
     }
 
     if (sources[index]->status == SRC_OK)
-      sources[index]->status = SRC_UNSELECTED;
+      mark_source(sources[index], SRC_UNSELECTED);
 
     elapsed = UTI_DiffTimespecsToDouble(ref_time, &src_ref_time);
     src_offset += elapsed * src_frequency;
@@ -642,12 +755,13 @@ SRC_SelectSource(SRC_Instance updated_inst)
   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 depth, best_depth, trust_depth, best_trust_depth;
+  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;
   double src_offset, src_offset_sd, src_frequency, src_frequency_sd, src_skew;
   double src_root_delay, src_root_dispersion;
   double best_lo, best_hi, distance, sel_src_distance, max_score;
+  double best_trust_lo, best_trust_hi;
   double first_sample_ago, max_reach_sample_ago;
   NTP_Leap leap_status;
 
@@ -669,7 +783,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
   /* Step 1 - build intervals about each source */
 
   n_endpoints = 0;
-  n_sel_sources = 0;
+  n_sel_sources = n_sel_trust_sources = 0;
   n_badstats_sources = 0;
   sel_req_source = 0;
   max_sel_reach = max_badstat_reach = 0;
@@ -679,6 +793,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
   for (i = 0; i < n_sources; i++) {
     assert(sources[i]->status != SRC_OK);
 
+    /* Don't allow the source to vote on leap seconds unless it's selectable */
+    sources[i]->leap_vote = 0;
+
     /* If some sources are specified with the require option, at least one
        of them will have to be selectable in order to update the clock */
     if (sources[i]->sel_options & SRC_SELECT_REQUIRE)
@@ -686,7 +803,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
 
     /* Ignore sources which were added with the noselect option */
     if (sources[i]->sel_options & SRC_SELECT_NOSELECT) {
-      sources[i]->status = SRC_UNSELECTABLE;
+      mark_source(sources[i], SRC_UNSELECTABLE);
       continue;
     }
 
@@ -698,7 +815,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
 
     if (!si->select_ok) {
       ++n_badstats_sources;
-      sources[i]->status = SRC_BAD_STATS;
+      mark_source(sources[i], SRC_BAD_STATS);
       if (max_badstat_reach < sources[i]->reachability)
         max_badstat_reach = sources[i]->reachability;
       continue;
@@ -714,20 +831,20 @@ SRC_SelectSource(SRC_Instance updated_inst)
       si->hi_limit += extra_disp;
     }
 
-    /* Require the root distance to be below the allowed maximum */
+    /* Require the root distance to be below the allowed maximum and the
-    if (si->root_distance > max_distance) {
+       endpoints to be in the right order (i.e. a non-negative distance) */
-      sources[i]->status = SRC_BAD_DISTANCE;
+    if (!(si->root_distance <= max_distance && si->lo_limit <= si->hi_limit)) {
+      mark_source(sources[i], SRC_BAD_DISTANCE);
       continue;
     }
 
     /* And the same applies for the estimated standard deviation */
     if (si->std_dev > max_jitter) {
-      sources[i]->status = SRC_JITTERY;
+      mark_source(sources[i], SRC_JITTERY);
       continue;
     }
 
     sources[i]->status = SRC_OK; /* For now */
-    sources[i]->leap_vote = 0;
 
     if (sources[i]->reachability && max_reach_sample_ago < first_sample_ago)
       max_reach_sample_ago = first_sample_ago;
@@ -752,7 +869,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
        can still be selected if its newest sample is not older than the oldest
        sample from reachable sources. */
     if (!sources[i]->reachability && max_reach_sample_ago < si->last_sample_ago) {
-      sources[i]->status = SRC_STALE;
+      mark_source(sources[i], SRC_STALE);
       continue;
     }
 
@@ -774,7 +891,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
        local unsychronised time and others are synchronised to it. */
 
     if (si->stratum >= orphan_stratum && sources[i]->type == SRC_NTP) {
-      sources[i]->status = SRC_ORPHAN;
+      mark_source(sources[i], SRC_ORPHAN);
 
       if (si->stratum == orphan_stratum && sources[i]->reachability &&
           (orphan_source == INVALID_SOURCE ||
@@ -804,6 +921,9 @@ SRC_SelectSource(SRC_Instance updated_inst)
     if (sources[i]->status != SRC_OK)
       continue;
 
+    if (sources[i]->sel_options & SRC_SELECT_TRUST)
+      n_sel_trust_sources++;
+
     si = &sources[i]->sel_info;
 
     j1 = n_endpoints;
@@ -820,7 +940,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
     n_endpoints += 2;
   }
 
-  DEBUG_LOG("badstat=%d sel=%d badstat_reach=%x sel_reach=%x size=%d max_reach_ago=%f",
+  DEBUG_LOG("badstat=%d sel=%d badstat_reach=%o sel_reach=%o size=%d max_reach_ago=%f",
             n_badstats_sources, n_sel_sources, (unsigned int)max_badstat_reach,
             (unsigned int)max_sel_reach, max_sel_reach_size, max_reach_sample_ago);
 
@@ -876,7 +996,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
 
   trust_depth = best_trust_depth = 0;
   depth = best_depth = 0;
-  best_lo = best_hi = 0.0;
+  best_lo = best_hi = best_trust_lo = best_trust_hi = 0.0;
 
   for (i = 0; i < n_endpoints; i++) {
     switch (sort_list[i].tag) {
@@ -886,14 +1006,20 @@ SRC_SelectSource(SRC_Instance updated_inst)
           trust_depth++;
         if (trust_depth > best_trust_depth ||
             (trust_depth == best_trust_depth && depth > best_depth)) {
-          best_trust_depth = trust_depth;
+          if (trust_depth > best_trust_depth) {
+            best_trust_depth = trust_depth;
+            best_trust_lo = sort_list[i].offset;
+          }
           best_depth = depth;
           best_lo = sort_list[i].offset;
         }
         break;
       case HIGH:
-        if (trust_depth == best_trust_depth && depth == best_depth)
+        if (trust_depth == best_trust_depth) {
-          best_hi = sort_list[i].offset;
+          if (depth == best_depth)
+            best_hi = sort_list[i].offset;
+          best_trust_hi = sort_list[i].offset;
+        }
         if (sources[sort_list[i].index]->sel_options & SRC_SELECT_TRUST)
           trust_depth--;
         depth--;
@@ -901,11 +1027,16 @@ SRC_SelectSource(SRC_Instance updated_inst)
       default:
         assert(0);
     }
+    assert(trust_depth <= depth);
+    assert(trust_depth >= 0);
   }
 
-  if (best_depth <= n_sel_sources / 2 && !best_trust_depth) {
+  assert(depth == 0 && trust_depth == 0);
-    /* Could not even get half the reachable sources to agree and there
+  assert(2 * n_sel_sources == n_endpoints);
-       are no trusted sources - clearly we can't synchronise */
+
+  if ((best_trust_depth == 0 && best_depth <= n_sel_sources / 2) ||
+      (best_trust_depth > 0 && best_trust_depth <= n_sel_trust_sources / 2)) {
+    /* Could not even get half the reachable (trusted) sources to agree */
 
     if (selected_source_index != INVALID_SOURCE) {
       log_selection_message("Can't synchronise: no majority", NULL);
@@ -932,24 +1063,28 @@ SRC_SelectSource(SRC_Instance updated_inst)
       continue;
 
     /* Check if source's interval contains the best interval, or is wholly
-       contained within it.  If there are any trusted sources the first
+       contained within it.  If there are any trusted sources, other sources
-       condition is applied only to them to not allow non-trusted sources to
+       are required to be wholly contained within the best interval of the
-       move the final offset outside the interval. */
+       trusted sources to not allow non-trusted sources to move the final
-    if (((!best_trust_depth || sources[i]->sel_options & SRC_SELECT_TRUST) &&
+       offset outside the trusted interval. */
-         sources[i]->sel_info.lo_limit <= best_lo &&
+    if ((sources[i]->sel_info.lo_limit <= best_lo &&
          sources[i]->sel_info.hi_limit >= best_hi) ||
         (sources[i]->sel_info.lo_limit >= best_lo &&
          sources[i]->sel_info.hi_limit <= best_hi)) {
 
+      if (!(best_trust_depth == 0 || (sources[i]->sel_options & SRC_SELECT_TRUST) ||
+            (sources[i]->sel_info.lo_limit >= best_trust_lo &&
+             sources[i]->sel_info.hi_limit <= best_trust_hi))) {
+        mark_source(sources[i], SRC_UNTRUSTED);
+        continue;
+      }
+
       sel_sources[n_sel_sources++] = i;
 
       if (sources[i]->sel_options & SRC_SELECT_REQUIRE)
         sel_req_source = 0;
-    } else if (sources[i]->sel_info.lo_limit <= best_lo &&
-               sources[i]->sel_info.hi_limit >= best_hi) {
-      sources[i]->status = SRC_UNTRUSTED;
     } else {
-      sources[i]->status = SRC_FALSETICKER;
+      mark_source(sources[i], SRC_FALSETICKER);
     }
   }
 
@@ -982,7 +1117,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
   if (i < n_sel_sources) {
     for (i = j = 0; i < n_sel_sources; i++) {
       if (!(sources[sel_sources[i]]->sel_options & SRC_SELECT_PREFER))
-        sources[sel_sources[i]]->status = SRC_NONPREFERRED;
+        mark_source(sources[sel_sources[i]], SRC_NONPREFERRED);
       else
         sel_sources[j++] = sel_sources[i];
     }
@@ -1046,10 +1181,8 @@ SRC_SelectSource(SRC_Instance updated_inst)
       sources[i]->sel_score = 1.0 / distance;
     }
 
-    DEBUG_LOG("select score=%f refid=%"PRIx32" match_refid=%"PRIx32" status=%u dist=%f",
+    DEBUG_LOG("%s score=%f dist=%f",
-              sources[i]->sel_score, sources[i]->ref_id,
+              source_to_string(sources[i]), sources[i]->sel_score, distance);
-              updated_inst ? updated_inst->ref_id : 0,
-              sources[i]->status, distance);
 
     if (max_score < sources[i]->sel_score) {
       max_score = sources[i]->sel_score;
@@ -1070,13 +1203,11 @@ SRC_SelectSource(SRC_Instance updated_inst)
     if (sources[max_score_index]->updates == 0) {
       selected_source_index = INVALID_SOURCE;
       mark_ok_sources(SRC_WAITS_UPDATE);
-      DEBUG_LOG("best source has no updates");
       return;
     }
 
     selected_source_index = max_score_index;
-    log_selection_message("Selected source %s",
+    log_selection_source("Selected source %s", sources[selected_source_index]);
-                          source_to_string(sources[selected_source_index]));
 
     /* New source has been selected, reset all scores */
     for (i = 0; i < n_sources; i++) {
@@ -1085,7 +1216,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
     }
   }
 
-  sources[selected_source_index]->status = SRC_SELECTED;
+  mark_source(sources[selected_source_index], SRC_SELECTED);
 
   /* Don't update reference when the selected source has no new samples */
 
@@ -1095,8 +1226,7 @@ SRC_SelectSource(SRC_Instance updated_inst)
     for (i = 0; i < n_sel_sources; i++) {
       index = sel_sources[i];
       if (sources[index]->status == SRC_OK)
-        sources[index]->status = sources[index]->distant ?
+        mark_source(sources[index], sources[index]->distant ? SRC_DISTANT : SRC_UNSELECTED);
-                                 SRC_DISTANT : SRC_UNSELECTED;
     }
     return;
   }
@@ -1196,9 +1326,8 @@ FILE *open_dumpfile(SRC_Instance inst, char mode)
   char filename[64], *dumpdir;
 
   dumpdir = CNF_GetDumpDir();
-  if (dumpdir[0] == '\0') {
+  if (!dumpdir)
     return NULL;
-  }
 
   /* Include IP address in the name for NTP sources, or reference ID in hex */
   if (inst->type == SRC_NTP && UTI_IsIPReal(inst->ip_addr))
@@ -1262,7 +1391,7 @@ SRC_RemoveDumpFiles(void)
   size_t i;
 
   dumpdir = CNF_GetDumpDir();
-  if (dumpdir[0] == '\0' ||
+  if (!dumpdir ||
       snprintf(pattern, sizeof (pattern), "%s/*.dat", dumpdir) >= sizeof (pattern))
     return;
 
@@ -1370,26 +1499,24 @@ SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now)
       case SRC_JITTERY:
         report->state = RPT_JITTERY;
         break;
-      case SRC_UNTRUSTED:
       case SRC_WAITS_SOURCES:
       case SRC_NONPREFERRED:
       case SRC_WAITS_UPDATE:
       case SRC_DISTANT:
       case SRC_OUTLIER:
-        report->state = RPT_OUTLIER;
+        report->state = RPT_SELECTABLE;
         break;
       case SRC_UNSELECTED:
-        report->state = RPT_CANDIDATE;
+        report->state = RPT_UNSELECTED;
         break;
       case SRC_SELECTED:
-        report->state = RPT_SYNC;
+        report->state = RPT_SELECTED;
         break;
       default:
-        report->state = RPT_UNREACH;
+        report->state = RPT_NONSELECTABLE;
         break;
     }
 
-    report->sel_options = src->sel_options;
     report->reachability = src->reachability;
 
     /* Call stats module to fill out estimates */
@@ -1423,6 +1550,78 @@ SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec
 
 /* ================================================== */
 
+static char
+get_status_char(SRC_Status status)
+{
+  switch (status) {
+    case SRC_UNSELECTABLE:
+      return 'N';
+    case SRC_BAD_STATS:
+      return 'M';
+    case SRC_BAD_DISTANCE:
+      return 'd';
+    case SRC_JITTERY:
+      return '~';
+    case SRC_WAITS_STATS:
+      return 'w';
+    case SRC_STALE:
+      return 'S';
+    case SRC_ORPHAN:
+      return 'O';
+    case SRC_UNTRUSTED:
+      return 'T';
+    case SRC_FALSETICKER:
+      return 'x';
+    case SRC_WAITS_SOURCES:
+      return 'W';
+    case SRC_NONPREFERRED:
+      return 'P';
+    case SRC_WAITS_UPDATE:
+      return 'U';
+    case SRC_DISTANT:
+      return 'D';
+    case SRC_OUTLIER:
+      return 'L';
+    case SRC_UNSELECTED:
+      return '+';
+    case SRC_SELECTED:
+      return '*';
+    default:
+      return '?';
+  }
+}
+
+/* ================================================== */
+
+int
+SRC_GetSelectReport(int index, RPT_SelectReport *report)
+{
+  SRC_Instance inst;
+
+  if (index >= n_sources || index < 0)
+    return 0;
+
+  inst = sources[index];
+
+  report->ref_id = inst->ref_id;
+  if (inst->ip_addr)
+    report->ip_addr = *inst->ip_addr;
+  else
+    report->ip_addr.family = IPADDR_UNSPEC;
+  report->state_char = get_status_char(inst->status);
+  report->authentication = inst->authenticated;
+  report->conf_options = inst->conf_sel_options;
+  report->eff_options = inst->sel_options;
+  report->last_sample_ago = inst->sel_info.last_sample_ago;
+  report->score = inst->sel_score;
+  report->lo_limit = inst->sel_info.lo_limit;
+  report->hi_limit = inst->sel_info.hi_limit;
+
+  return 1;
+}
+
+/* ================================================== */
+
 SRC_Type
 SRC_GetType(int index)
 {

sources.h

@@ -51,6 +51,14 @@ extern void SRC_Initialise(void);
 /* Finalisation function */
 extern void SRC_Finalise(void);
 
+/* Modes for selecting NTP sources based on their authentication status */
+typedef enum {
+  SRC_AUTHSELECT_IGNORE,
+  SRC_AUTHSELECT_MIX,
+  SRC_AUTHSELECT_PREFER,
+  SRC_AUTHSELECT_REQUIRE,
+} SRC_AuthSelectMode;
+
 typedef enum {
   SRC_NTP,                      /* NTP client/peer */
   SRC_REFCLOCK                  /* Rerefence clock */
@@ -59,9 +67,9 @@ typedef enum {
 /* Function to create a new instance.  This would be called by one of
    the individual source-type instance creation routines. */
 
-extern SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_options,
+extern SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int authenticated,
-                                          IPAddr *addr, int min_samples, int max_samples,
+                                          int sel_options, IPAddr *addr, int min_samples,
-                                          double min_delay, double asymmetry);
+                                          int max_samples, double min_delay, double asymmetry);
 
 /* Function to get rid of a source when it is being unconfigured.
    This may cause the current reference source to be reselected, if this
@@ -122,9 +130,10 @@ extern int SRC_IsSyncPeer(SRC_Instance inst);
 extern int SRC_IsReachable(SRC_Instance inst);
 extern int SRC_ReadNumberOfSources(void);
 extern int SRC_ActiveSources(void);
-extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now);
 
+extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now);
 extern int SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec *now);
+extern int SRC_GetSelectReport(int index, RPT_SelectReport *report);
 
 extern SRC_Type SRC_GetType(int index);
 

srcparams.h

@@ -76,7 +76,7 @@ typedef struct {
 #define SRC_DEFAULT_MINSAMPLES (-1)
 #define SRC_DEFAULT_MAXSAMPLES (-1)
 #define SRC_DEFAULT_ASYMMETRY 1.0
-#define SRC_DEFAULT_NTSPORT 11443
+#define SRC_DEFAULT_NTSPORT 4460
 #define INACTIVE_AUTHKEY 0
 
 /* Flags for source selection */

stubs.c

@@ -49,7 +49,7 @@
 #include "sched.h"
 #include "util.h"
 
-#ifndef FEAT_ASYNCDNS
+#if defined(FEAT_NTP) && !defined(FEAT_ASYNCDNS)
 
 /* This is a blocking implementation used when asynchronous resolving is not available */
 
@@ -112,7 +112,7 @@ DNS_Name2IPAddressAsync(const char *name, DNS_NameResolveHandler handler, void *
 #ifndef FEAT_CMDMON
 
 void
-CAM_Initialise(int family)
+CAM_Initialise(void)
 {
 }
 
@@ -147,7 +147,7 @@ MNL_Finalise(void)
 #ifndef FEAT_NTP
 
 void
-NCR_AddBroadcastDestination(IPAddr *addr, unsigned short port, int interval)
+NCR_AddBroadcastDestination(NTP_Remote_Address *addr, int interval)
 {
 }
 
@@ -174,7 +174,7 @@ NCR_CheckAccessRestriction(IPAddr *ip_addr)
 }
 
 void
-NIO_Initialise(int family)
+NIO_Initialise(void)
 {
 }
 
@@ -194,23 +194,30 @@ NSR_Finalise(void)
 }
 
 NSR_Status
-NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params)
+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)
+NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type,
+                    SourceParameters *params, uint32_t *conf_id)
 {
   return NSR_TooManySources;
 }
 
 NSR_Status
-NSR_RemoveSource(NTP_Remote_Address *remote_addr)
+NSR_RemoveSource(IPAddr *address)
 {
   return NSR_NoSuchSource;
 }
 
+void
+NSR_RemoveSourcesById(uint32_t conf_id)
+{
+}
+
 void
 NSR_RemoveAllSources(void)
 {
@@ -319,6 +326,12 @@ 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)
 {
@@ -414,12 +427,6 @@ NSD_Finalise(void)
 {
 }
 
-int
-NSD_GetAuthDelay(uint32_t key_id)
-{
-  return 0;
-}
-
 int
 NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_PacketInfo *info,
                       NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)
@@ -431,21 +438,20 @@ NSD_SignAndSendPacket(uint32_t key_id, NTP_Packet *packet, NTP_PacketInfo *info,
 
 #ifndef HAVE_CMAC
 
-unsigned int
+int
-CMC_GetKeyLength(const char *cipher)
+CMC_GetKeyLength(CMC_Algorithm algorithm)
 {
   return 0;
 }
 
 CMC_Instance
-CMC_CreateInstance(const char *cipher, const unsigned char *key, unsigned int length)
+CMC_CreateInstance(CMC_Algorithm algorithm, const unsigned char *key, int length)
 {
   return NULL;
 }
 
-unsigned int
+int
-CMC_Hash(CMC_Instance inst, const unsigned char *in, unsigned int in_len,
+CMC_Hash(CMC_Instance inst, const void *in, int in_len, unsigned char *out, int out_len)
-         unsigned char *out, unsigned int out_len)
 {
   return 0;
 }
@@ -504,14 +510,16 @@ NNC_PrepareForAuth(NNC_Instance inst)
 int
 NNC_GenerateRequestAuth(NNC_Instance inst, NTP_Packet *packet, NTP_PacketInfo *info)
 {
-  DEBUG_LOG("NTS support disabled");
+  static int logged = 0;
+
+  LOG(logged ? LOGS_DEBUG : LOGS_WARN, "Missing NTS support");
+  logged = 1;
   return 0;
 }
 
 int
 NNC_CheckResponseAuth(NNC_Instance inst, NTP_Packet *packet, NTP_PacketInfo *info)
 {
-  DEBUG_LOG("NTS support disabled");
   return 0;
 }
 
@@ -526,17 +534,17 @@ NNC_DumpData(NNC_Instance inst)
 }
 
 void
-NKC_Initialise(void)
+NNC_GetReport(NNC_Instance inst, RPT_AuthReport *report)
 {
 }
 
 void
-NKC_Finalise(void)
+NKS_PreInitialise(uid_t uid, gid_t gid, int scfilter_level)
 {
 }
 
 void
-NKS_Initialise(int scfilter_level)
+NKS_Initialise(void)
 {
 }
 

sys_generic.c

@@ -417,6 +417,8 @@ SYS_Generic_Finalise(void)
 
   LCL_ReadRawTime(&now);
   stop_fastslew(&now);
+
+  LCL_RemoveParameterChangeHandler(handle_step, NULL);
 }
 
 /* ================================================== */

sys_linux.c

@@ -437,10 +437,16 @@ SYS_Linux_DropRoot(uid_t uid, gid_t gid, int clock_control)
   
   UTI_DropRoot(uid, gid);
 
-  /* Keep CAP_NET_BIND_SERVICE only if a server NTP port can be opened
+  /* Keep CAP_NET_BIND_SERVICE if the NTP server sockets may need to be bound
-     and keep CAP_SYS_TIME only if the clock control is enabled */
+     to a privileged port.
-  if (snprintf(cap_text, sizeof (cap_text), "%s %s",
+     Keep CAP_NET_RAW if an NTP socket may need to be bound to a device on
-               CNF_GetNTPPort() ? "cap_net_bind_service=ep" : "",
+     kernels before 5.7.
+     Keep CAP_SYS_TIME if the clock control is enabled. */
+  if (snprintf(cap_text, sizeof (cap_text), "%s %s %s",
+               (CNF_GetNTPPort() > 0 && CNF_GetNTPPort() < 1024) ?
+                 "cap_net_bind_service=ep" : "",
+               (CNF_GetBindNtpInterface() || CNF_GetBindAcquisitionInterface()) &&
+                 !SYS_Linux_CheckKernelVersion(5, 7) ? "cap_net_raw=ep" : "",
                clock_control ? "cap_sys_time=ep" : "") >= sizeof (cap_text))
     assert(0);
 
@@ -478,36 +484,123 @@ SYS_Linux_EnableSystemCallFilter(int level, SYS_SystemCallContext context)
 {
   const int syscalls[] = {
     /* Clock */
-    SCMP_SYS(adjtimex), SCMP_SYS(clock_adjtime), SCMP_SYS(clock_gettime),
+    SCMP_SYS(adjtimex),
-    SCMP_SYS(gettimeofday), SCMP_SYS(settimeofday), SCMP_SYS(time),
+    SCMP_SYS(clock_adjtime),
+#ifdef __NR_clock_adjtime64
+    SCMP_SYS(clock_adjtime64),
+#endif
+    SCMP_SYS(clock_gettime),
+#ifdef __NR_clock_gettime64
+    SCMP_SYS(clock_gettime64),
+#endif
+    SCMP_SYS(gettimeofday),
+    SCMP_SYS(settimeofday),
+    SCMP_SYS(time),
+
     /* Process */
-    SCMP_SYS(clone), SCMP_SYS(exit), SCMP_SYS(exit_group), SCMP_SYS(getpid),
+    SCMP_SYS(clone),
-    SCMP_SYS(getrlimit), SCMP_SYS(getuid), SCMP_SYS(rt_sigaction), SCMP_SYS(rt_sigreturn),
+    SCMP_SYS(exit),
-    SCMP_SYS(rt_sigprocmask), SCMP_SYS(set_tid_address), SCMP_SYS(sigreturn),
+    SCMP_SYS(exit_group),
-    SCMP_SYS(wait4), SCMP_SYS(waitpid),
+    SCMP_SYS(getpid),
+    SCMP_SYS(getrlimit),
+    SCMP_SYS(getuid),
+    SCMP_SYS(rt_sigaction),
+    SCMP_SYS(rt_sigreturn),
+    SCMP_SYS(rt_sigprocmask),
+    SCMP_SYS(set_tid_address),
+    SCMP_SYS(sigreturn),
+    SCMP_SYS(wait4),
+    SCMP_SYS(waitpid),
+
     /* Memory */
-    SCMP_SYS(brk), SCMP_SYS(madvise), SCMP_SYS(mmap), SCMP_SYS(mmap2),
+    SCMP_SYS(brk),
-    SCMP_SYS(mprotect), SCMP_SYS(mremap), SCMP_SYS(munmap), SCMP_SYS(shmdt),
+    SCMP_SYS(madvise),
+    SCMP_SYS(mmap),
+    SCMP_SYS(mmap2),
+    SCMP_SYS(mprotect),
+    SCMP_SYS(mremap),
+    SCMP_SYS(munmap),
+    SCMP_SYS(shmdt),
+
     /* Filesystem */
-    SCMP_SYS(_llseek), SCMP_SYS(access), SCMP_SYS(chmod), SCMP_SYS(chown),
+    SCMP_SYS(_llseek),
-    SCMP_SYS(chown32), SCMP_SYS(faccessat), SCMP_SYS(fchmodat), SCMP_SYS(fchownat),
+    SCMP_SYS(access),
-    SCMP_SYS(fstat), SCMP_SYS(fstat64), SCMP_SYS(getdents), SCMP_SYS(getdents64),
+    SCMP_SYS(chmod),
-    SCMP_SYS(lseek), SCMP_SYS(newfstatat), SCMP_SYS(rename), SCMP_SYS(renameat),
+    SCMP_SYS(chown),
-    SCMP_SYS(renameat2), SCMP_SYS(stat), SCMP_SYS(stat64), SCMP_SYS(statfs),
+    SCMP_SYS(chown32),
-    SCMP_SYS(statfs64), SCMP_SYS(unlink), SCMP_SYS(unlinkat),
+    SCMP_SYS(faccessat),
+    SCMP_SYS(fchmodat),
+    SCMP_SYS(fchownat),
+    SCMP_SYS(fstat),
+    SCMP_SYS(fstat64),
+    SCMP_SYS(getdents),
+    SCMP_SYS(getdents64),
+    SCMP_SYS(lseek),
+    SCMP_SYS(lstat),
+    SCMP_SYS(lstat64),
+    SCMP_SYS(newfstatat),
+    SCMP_SYS(readlink),
+    SCMP_SYS(readlinkat),
+    SCMP_SYS(rename),
+    SCMP_SYS(renameat),
+    SCMP_SYS(renameat2),
+    SCMP_SYS(stat),
+    SCMP_SYS(stat64),
+    SCMP_SYS(statfs),
+    SCMP_SYS(statfs64),
+    SCMP_SYS(unlink),
+    SCMP_SYS(unlinkat),
+
     /* Socket */
-    SCMP_SYS(accept), SCMP_SYS(bind), SCMP_SYS(connect), SCMP_SYS(getsockname),
+    SCMP_SYS(accept),
-    SCMP_SYS(getsockopt), SCMP_SYS(recv), SCMP_SYS(recvfrom),
+    SCMP_SYS(bind),
-    SCMP_SYS(recvmmsg), SCMP_SYS(recvmsg), SCMP_SYS(send), SCMP_SYS(sendmmsg),
+    SCMP_SYS(connect),
-    SCMP_SYS(sendmsg), SCMP_SYS(sendto), SCMP_SYS(shutdown),
+    SCMP_SYS(getsockname),
+    SCMP_SYS(getsockopt),
+    SCMP_SYS(recv),
+    SCMP_SYS(recvfrom),
+    SCMP_SYS(recvmmsg),
+#ifdef __NR_recvmmsg_time64
+    SCMP_SYS(recvmmsg_time64),
+#endif
+    SCMP_SYS(recvmsg),
+    SCMP_SYS(send),
+    SCMP_SYS(sendmmsg),
+    SCMP_SYS(sendmsg),
+    SCMP_SYS(sendto),
+    SCMP_SYS(shutdown),
     /* TODO: check socketcall arguments */
     SCMP_SYS(socketcall),
+
     /* General I/O */
-    SCMP_SYS(_newselect), SCMP_SYS(close), SCMP_SYS(open), SCMP_SYS(openat), SCMP_SYS(pipe),
+    SCMP_SYS(_newselect),
-    SCMP_SYS(pipe2), SCMP_SYS(poll), SCMP_SYS(ppoll), SCMP_SYS(pselect6), SCMP_SYS(read),
+    SCMP_SYS(close),
-    SCMP_SYS(futex), SCMP_SYS(select), SCMP_SYS(set_robust_list), SCMP_SYS(write),
+    SCMP_SYS(open),
+    SCMP_SYS(openat),
+    SCMP_SYS(pipe),
+    SCMP_SYS(pipe2),
+    SCMP_SYS(poll),
+    SCMP_SYS(ppoll),
+#ifdef __NR_ppoll_time64
+    SCMP_SYS(ppoll_time64),
+#endif
+    SCMP_SYS(pselect6),
+#ifdef __NR_pselect6_time64
+    SCMP_SYS(pselect6_time64),
+#endif
+    SCMP_SYS(read),
+    SCMP_SYS(futex),
+#ifdef __NR_futex_time64
+    SCMP_SYS(futex_time64),
+#endif
+    SCMP_SYS(select),
+    SCMP_SYS(set_robust_list),
+    SCMP_SYS(write),
+
     /* Miscellaneous */
-    SCMP_SYS(getrandom), SCMP_SYS(sysinfo), SCMP_SYS(uname),
+    SCMP_SYS(getrandom),
+    SCMP_SYS(sysinfo),
+    SCMP_SYS(uname),
   };
 
   const int socket_domains[] = {

sys_macosx.c

@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2001
  * Copyright (C) J. Hannken-Illjes  2001
- * Copyright (C) Bryan Christianson  2015, 2017
+ * Copyright (C) Bryan Christianson  2015, 2017, 2020
  *
  * 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

sys_timex.c

@@ -68,6 +68,25 @@ static int sys_tai_offset;
 
 /* ================================================== */
 
+static double
+convert_timex_frequency(const struct timex *txc)
+{
+  double freq_ppm;
+
+  freq_ppm = txc->freq / FREQ_SCALE;
+
+#ifdef MACOSX
+  /* Temporary workaround for Apple bug treating freq as unsigned number */
+  if (freq_ppm > 32767) {
+    freq_ppm -= 65536;
+  }
+#endif
+
+  return -freq_ppm;
+}
+
+/* ================================================== */
+
 static double
 read_frequency(void)
 {
@@ -77,7 +96,7 @@ read_frequency(void)
 
   SYS_Timex_Adjust(&txc, 0);
 
-  return txc.freq / -FREQ_SCALE;
+  return convert_timex_frequency(&txc);
 }
 
 /* ================================================== */
@@ -92,7 +111,7 @@ set_frequency(double freq_ppm)
 
   SYS_Timex_Adjust(&txc, 0);
 
-  return txc.freq / -FREQ_SCALE;
+  return convert_timex_frequency(&txc);
 }
 
 /* ================================================== */

test/compilation/001-features

@@ -17,12 +17,15 @@ for opts in \
 	"--disable-rtc" \
 	"--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"
 do

test/kernel/ntpadjtime.c

@@ -52,15 +52,15 @@ test_freqrange(void)
 
   printf("freq range:\n");
 
-  for (i = 0; i <= 1000; i += 50) {
+  for (i = -1000; i <= 1000; i += 50) {
     t.modes = MOD_FREQUENCY;
-    t.freq = i << 16;
+    t.freq = i * (1 << 16);
     printf("%4d ppm => ", i);
     if (try_ntpadjtime(&t) < 0)
       continue;
 
     printf("%4ld ppm : ", t.freq / (1 << 16));
-    printf("%s\n", t.freq == i << 16 ? "ok" : "fail");
+    printf("%s\n", t.freq == i * (1 << 16) ? "ok" : "fail");
   }
 }
 

test/simulation/110-chronyc

@@ -8,12 +8,17 @@ check_config_h 'FEAT_REFCLOCK 1' || test_skip
 check_config_h 'FEAT_CMDMON 1' || test_skip
 
 refclock_jitter=$jitter
+client_server_conf="
+server node1.net1.clk
+server 192.168.123.2"
 client_conf="
 refclock SHM 0 noselect
 smoothtime 400 0.001 leaponly"
 
 chronyc_conf="activity
 tracking
+sourcename 192.168.123.1
+sourcename 192.168.123.2
 sources
 sourcestats
 manual list
@@ -25,7 +30,7 @@ run_test || test_fail
 check_chronyd_exit || test_fail
 
 check_chronyc_output "^200 OK
-1 sources online
+2 sources online
 0 sources offline
 0 sources doing burst \(return to online\)
 0 sources doing burst \(return to offline\)
@@ -43,14 +48,18 @@ Root delay      : 0\.000...... seconds
 Root dispersion : 0\.000...... seconds
 Update interval : [0-9]+\.. seconds
 Leap status     : Normal
+node1\.net1\.clk
+192\.168\.123\.2
 MS Name/IP address         Stratum Poll Reach LastRx Last sample               
 ===============================================================================
 #\? SHM0                          0   4   377    [0-9]+ [0-9 +-]+[un]s\[[0-9 +-]+[un]s\] \+/-[ 0-9]+[un]s
 \^\* 192\.168\.123\.1                 1   [67]   377    [0-9]+ [0-9 +-]+[un]s\[[0-9 +-]+[un]s\] \+/-[ 0-9]+[un]s
+\^\? 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
 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
 #    Date     Time\(UTC\)    Slewed   Original   Residual
 =======================================================
@@ -71,11 +80,22 @@ run_test || test_fail
 check_chronyd_exit || test_fail
 
 check_chronyc_output "^Reference ID    : C0A87B01 \(node1\.net1\.clk\)" \
-|| test_fail
+	|| test_fail
 
+chronyc_options="-c"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+
+check_chronyc_output "^C0A87B01,192\.168\.123\.1,2,12623049..\..........,-?0\.0000.....,-?0\.000......,0\.000......,(99|100)\....,-?[0-9]\....,[0-9]\....,0\.000......,0\.000......,[0-9]+\..,Normal$" \
+	|| test_fail
+
+chronyc_options=""
 server_strata=0
 chronyc_start=0
+client_server_conf=""
 client_conf=""
+server_conf="server 192.168.123.1"
 limit=1
 
 for chronyc_conf in \
@@ -93,10 +113,14 @@ for chronyc_conf in \
 	"allow ::/0" \
 	"allow" \
 	"allow all 10/24" \
+	"authdata" \
 	"burst 5/10" \
 	"burst 3/5 255.255.255.0/1.2.3.0" \
 	"burst 1/2 1.2.3.0/24" \
 	"clients" \
+	"clients -k" \
+	"clients -p 100" \
+	"clients -r" \
 	"cmdaccheck 1.2.3.4" \
 	"cmdallow 1.2.3.4" \
 	"cmdallow all 1.2.3.0/24" \
@@ -136,9 +160,11 @@ for chronyc_conf in \
 	"polltarget 1.2.3.4 10" \
 	"refresh" \
 	"rekey" \
+	"reload sources" \
 	"reselect" \
 	"reselectdist 1e-3" \
-	"reset" \
+	"reset sources" \
+	"selectdata" \
 	"settime 16:30" \
 	"settime 16:30:05" \
 	"settime Nov 21, 2015 16:30:05" \
@@ -151,7 +177,7 @@ for chronyc_conf in \
 do
 	run_test || test_fail
 	check_chronyd_exit || test_fail
-	check_chronyc_output "501 Not authorised" || test_fail
+	check_chronyc_output "501 Not authorised$" || test_fail
 done
 
 chronyc_conf="dns -n

test/simulation/120-selectoptions

@@ -65,4 +65,28 @@ check_packet_interval || test_fail
 check_source_selection && test_fail
 check_sync && test_fail
 
+cat > tmp/keys <<-EOF
+1 MD5 HEX:1B81CBF88D4A73F2E8CE59647F6E5C1719B6CAF5
+EOF
+
+server_conf="keyfile tmp/keys"
+client_server_conf="
+server 192.168.123.1 key 1
+server 192.168.123.2
+server 192.168.123.3"
+
+for authselectmode in require prefer mix ignore; do
+	client_conf="keyfile tmp/keys
+		     authselectmode $authselectmode"
+	run_test || test_fail
+	check_chronyd_exit || test_fail
+	check_source_selection || test_fail
+	check_packet_interval || test_fail
+	if [ $authselectmode = ignore ]; then
+		check_sync || test_fail
+	else
+		check_sync && test_fail
+	fi
+done
+
 test_pass

test/simulation/139-nts

@@ -46,7 +46,7 @@ check_sync || test_fail
 
 check_file_messages "20.*123\.1.* 111 111 1111" 75 80 measurements.log || test_fail
 check_file_messages "20.*123\.1.* 111 001 0000" 37 39 measurements.log || test_fail
-check_file_messages "	2	1	.*	11443	" 260 300 log.packets || test_fail
+check_file_messages "	2	1	.*	4460	" 260 300 log.packets || test_fail
 check_file_messages "." 6 6 ntskeys || test_fail
 rm -f tmp/measurements.log
 
@@ -61,7 +61,7 @@ check_sync || test_fail
 
 check_file_messages "20.*123\.1.* 111 111 1111" 99 103 measurements.log || test_fail
 check_file_messages "20.*123\.1.* 111 001 0000" 0 0 measurements.log || test_fail
-check_file_messages "	2	1	.*	11443	" 350 390 log.packets || test_fail
+check_file_messages "	2	1	.*	4460	" 350 390 log.packets || test_fail
 check_file_messages "." 6 6 ntskeys || test_fail
 check_file_messages "." 11 12 192.168.123.1.nts || test_fail
 rm -f tmp/measurements.log
@@ -80,8 +80,8 @@ check_sync || test_fail
 
 check_file_messages "20.*123\.1.* 111 111 1111" 150 160 measurements.log || test_fail
 check_file_messages "20.*123\.1.* 111 001 0000" 0 0 measurements.log || test_fail
-check_file_messages "	2	1	.*	11443	" 6 10 log.packets || test_fail
+check_file_messages "	2	1	.*	4460	" 6 10 log.packets || test_fail
-check_file_messages "^9\.......e+03	2	1	.*	11443	" 6 10 log.packets || test_fail
+check_file_messages "^9\.......e+03	2	1	.*	4460	" 6 10 log.packets || test_fail
 check_file_messages "." 6 6 ntskeys || test_fail
 check_file_messages "." 11 12 192.168.123.1.nts || test_fail
 rm -f tmp/measurements.log
@@ -95,6 +95,79 @@ check_source_selection && test_fail
 check_sync && test_fail
 
 check_file_messages "	2	1	.*	123	" 0 0 log.packets || test_fail
-check_file_messages "	2	1	.*	11443	" 10 20 log.packets || test_fail
+check_file_messages "	2	1	.*	4460	" 10 20 log.packets || test_fail
+
+export CLKNETSIM_START_DATE=$(date -d 'Jan  2 00:00:01 UTC 2010' +'%s')
+
+client_conf="
+nosystemcert
+ntstrustedcerts tmp/server.crt"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection && test_fail
+check_sync && test_fail
+
+check_file_messages "	2	1	.*	123	" 0 0 log.packets || test_fail
+check_file_messages "	2	1	.*	4460	" 10 20 log.packets || test_fail
+check_log_messages "expired certificate" 4 4 || test_fail
+
+client_conf+="
+nocerttimecheck 1"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+export CLKNETSIM_START_DATE=$(date -d 'Jan  1 00:00:00 UTC 2010' +'%s')
+
+server_conf="
+ntsserverkey tmp/server.key
+ntsservercert tmp/server.crt
+ntsprocesses 0
+ntsrotate 0
+ntsdumpdir tmp
+ntsntpserver 192.168.123.2"
+client_conf="
+nosystemcert
+ntstrustedcerts tmp/server.crt
+ntsrefresh 500"
+client_server_conf="server node1.net1.clk $client_server_options"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection && test_fail
+check_sync && test_fail
+
+check_file_messages "	2	1	.*	4460	" 50 100 log.packets || test_fail
+check_file_messages "	2	2	.*	4460	" 0 0 log.packets || test_fail
+check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 6 8 || test_fail
+check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 6 8 || test_fail
+
+servers=2
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+check_file_messages "	3	1	.*	4460	" 100 150 log.packets || test_fail
+check_file_messages "	3	2	.*	4460	" 0 0 log.packets || test_fail
+check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 1 1 || test_fail
+check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 0 0 || test_fail
+
+server_conf+="
+ntsratelimit interval 12 burst 1 leak 4"
+
+client_chronyd_options="-d -d"
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection && test_fail
+
+check_file_messages "	3	1	.*	4460	1	0	2" 25 50 log.packets || test_fail
+check_file_messages "	3	2	.*	4460	" 0 0 log.packets || test_fail
+check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 2 6 || test_fail
+check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 1 6 || test_fail
 
 test_pass

test/simulation/140-noclientlog

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+. ./test.common
+test_start "noclientlog option"
+
+server_conf="noclientlog"
+client_server_options="xleave"
+client_conf="
+logdir tmp
+log rawmeasurements"
+
+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 "111 111 1111.* 4B " 30 200 measurements.log || test_fail
+check_file_messages "111 111 1111.* 4I " 0 0 measurements.log || test_fail
+
+test_pass

test/simulation/test.common

@@ -64,6 +64,7 @@ default_client_conf=""
 default_chronyc_conf=""
 default_server_chronyd_options=""
 default_client_chronyd_options=""
+default_chronyc_options=""
 
 default_time_max_limit=1e-3
 default_freq_max_limit=5e-4
@@ -276,6 +277,7 @@ check_chronyd_exit() {
 
 		grep -q 'chronyd exiting' tmp/log.$i && \
 			! grep -q 'Adjustment.*exceeds.*exiting' tmp/log.$i && \
+			! grep -q 'Assertion.*failed' tmp/log.$i && \
 			test_ok || test_bad
 		[ $? -eq 0 ] || ret=1
 	done
@@ -503,7 +505,7 @@ run_test() {
 
 		echo "node${node}_start = $chronyc_start" >> tmp/conf
 		start_client $node chronyc "$chronyc_conf" "" \
-			"$([ $dns -eq 0 ] && printf "%s" "-n") -h $(get_node_name $[$node - $clients])" && \
+			"$([ $dns -eq 0 ] && printf "%s" "-n") -h $(get_node_name $[$node - $clients]) $chronyc_options" && \
 			test_ok || test_error
 
 		[ $? -ne 0 ] && return 1

test/system/007-cmdmon

@@ -5,62 +5,150 @@
 test_start "chronyc commands"
 
 start_chronyd || test_fail
+wait_for_sync || test_fail
 
 for command in \
-	"accheck 1.2.3.4" \
+	"allow 1.2.3.4" \
-	"delete $server" \
+	"deny 1.2.3.4" \
-	"add server $server" \
+	"cmddeny" \
-	"deny" \
+	"cmdallow" \
-	"allow" \
-	"burst 1/1" \
-	"clients" \
-	"cmdallow 1.2.3.4" \
-	"cmdaccheck 1.2.3.4" \
 	"cmddeny 1.2.3.4" \
+	"cmdallow 1.2.3.4" \
+	"add server 127.123.1.1" \
+	"delete 127.123.1.1" \
+	"burst 1/1" \
 	"cyclelogs" \
 	"dfreq 1.0e-3" \
 	"doffset -0.1" \
 	"dump" \
 	"local off" \
 	"local" \
-	"manual on" \
+	"maxdelay $server 1e-1" \
-	"settime now" \
-	"manual delete 0" \
-	"settime now" \
-	"manual reset" \
-	"manual off" \
-	"maxdelay $server 1e-2" \
 	"maxdelaydevratio $server 5.0" \
 	"maxdelayratio $server 3.0" \
 	"maxpoll $server 5" \
 	"maxupdateskew $server 10.0" \
 	"minpoll $server 3" \
 	"minstratum $server 1" \
-	"ntpdata $server" \
 	"offline" \
 	"online" \
 	"onoffline" \
 	"polltarget $server 10" \
 	"refresh" \
 	"rekey" \
+	"reload sources" \
 	"reselect" \
 	"reselectdist 1e-3" \
-	"serverstats" \
+	"reset sources" \
 	"smoothtime reset" \
 	"smoothtime activate" \
-	"shutdown" \
 ; do
 	run_chronyc "$command" || test_fail
+	check_chronyc_output "^200 OK$" || test_fail
 done
 
+run_chronyc "accheck $server" || test_fail
+check_chronyc_output "^208 Access allowed$" || test_fail
+run_chronyc "accheck 1.2.3.4" || test_fail
+check_chronyc_output "^209 Access denied$" || test_fail
+
+run_chronyc "cmdaccheck 1.2.3.4" || test_fail
+check_chronyc_output "^208 Access allowed$" || test_fail
+
+run_chronyc "authdata" || test_fail
+check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================
+127\.0\.0\.1                      -     0    0    0    -    0    0    0    0$" \
+	|| test_chronyc
+
+run_chronyc "clients" || test_fail
+check_chronyc_output "^Hostname                      NTP   Drop Int IntL Last     Cmd   Drop Int  Last
+===============================================================================
+127\.0\.0\.1                       [1-9]      0   -   -     [0-9]       0      0   -     -$" \
+	|| test_fail
+
+run_chronyc "ntpdata $server" || test_fail
+check_chronyc_output "^Remote address  : 127\.0\.0\.1 \(7F000001\)
+Remote port     : [0-9]+
+Local address   : 127\.0\.0\.1 \(7F000001\)
+Leap status     : Normal
+Version         : 4
+Mode            : Server
+Stratum         : 10
+Poll interval   : -6 \(0 seconds\)
+Precision       : [0-9 +-]+ \(0\.[0-9]+ seconds\)
+Root delay      : 0\.000000 seconds
+Root dispersion : 0\.000000 seconds
+Reference ID    : 7F7F0101 \(\)
+Reference time  : [A-Za-z0-9: ]+
+Offset          : [+-]0\.......... seconds
+Peer delay      : 0\.......... seconds
+Peer dispersion : 0\.......... seconds
+Response time   : 0\.......... seconds
+Jitter asymmetry: \+0\.00
+NTP tests       : 111 111 1110
+Interleaved     : No
+Authenticated   : No
+TX timestamping : (Daemon|Kernel)
+RX timestamping : (Daemon|Kernel)
+Total TX        : [0-9]+
+Total RX        : [0-9]+
+Total valid RX  : [0-9]+$" || test_fail
+
+run_chronyc "selectdata" || test_fail
+check_chronyc_output "^S Name/IP Address        Auth COpts EOpts Last Score     Interval +
+====================================================================
+M 127\.0\.0\.1                 N ----- -----    0   1\.0    \+0ns    \+0ns$" || test_fail
+
+run_chronyc "serverstats" || test_fail
+check_chronyc_output "^NTP packets received       : [0-9]+
+NTP packets dropped        : 0
+Command packets received   : [0-9]+
+Command packets dropped    : 0
+Client log records dropped : 0
+NTS-KE connections accepted: 0
+NTS-KE connections dropped : 0
+Authenticated NTP packets  : 0$" || test_fail
+
+run_chronyc "manual on" || test_fail
+check_chronyc_output "^200 OK$" || test_fail
+
+run_chronyc "settime now" || test_fail
+check_chronyc_output "^200 OK
+Clock was.*$" || test_fail
+
+run_chronyc "manual delete 0" || test_fail
+check_chronyc_output "^200 OK$" || test_fail
+
+run_chronyc "settime now" || test_fail
+check_chronyc_output "^200 OK
+Clock was.*$" || test_fail
+
+run_chronyc "manual list" || test_fail
+check_chronyc_output "^210 n_samples = 1
+#    Date     Time\(UTC\)    Slewed   Original   Residual
+=======================================================
+ 0.*$" || test_fail
+
+run_chronyc "manual reset" || test_fail
+check_chronyc_output "^200 OK$" || test_fail
+
+run_chronyc "manual off" || test_fail
+check_chronyc_output "^200 OK$" || test_fail
+
+run_chronyc "shutdown" || test_fail
+check_chronyc_output "^200 OK$" || test_fail
+
 stop_chronyd || test_fail
 check_chronyd_messages || test_fail
 start_chronyd || test_fail
 
 run_chronyc "makestep" && test_fail
 check_chronyc_output "500 Failure" || test_fail
+
 run_chronyc "trimrtc" && test_fail
 check_chronyc_output "513 RTC driver not running" || test_fail
+
 run_chronyc "writertc" && test_fail
 check_chronyc_output "513 RTC driver not running" || test_fail
 

test/system/008-confload

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "loading of configuration"
+
+minimal_config=1
+extra_chronyd_directives="
+include $TEST_DIR/conf1.d/conf.1
+confdir $TEST_DIR/conf1.d
+confdir $TEST_DIR/conf2.d $TEST_DIR/conf3.d $TEST_DIR/conf4.d
+sourcedir $TEST_DIR/conf5.d
+include $TEST_DIR/conf1.d/conf.2"
+
+mkdir $TEST_DIR/conf{1,2,3,4,5}.d
+
+echo "server 127.123.1.1" > $TEST_DIR/conf1.d/conf.1
+echo "server 127.123.1.2" > $TEST_DIR/conf1.d/conf.2
+echo "server 127.123.1.3" > $TEST_DIR/conf1.d/3.conf
+echo "server 127.123.1.4" > $TEST_DIR/conf1.d/4.conf
+echo "server 127.123.2.2" > $TEST_DIR/conf2.d/2.conf
+echo "server 127.123.2.3" > $TEST_DIR/conf2.d/3.conf
+echo "server 127.123.3.1" > $TEST_DIR/conf3.d/1.conf
+echo "server 127.123.3.2" > $TEST_DIR/conf3.d/2.conf
+echo "server 127.123.3.3" > $TEST_DIR/conf3.d/3.conf
+echo "server 127.123.4.1" > $TEST_DIR/conf4.d/1.conf
+echo "server 127.123.4.2" > $TEST_DIR/conf4.d/2.conf
+echo "server 127.123.4.3" > $TEST_DIR/conf4.d/3.conf
+echo "server 127.123.4.4" > $TEST_DIR/conf4.d/4.conf
+echo "server 127.123.5.1" > $TEST_DIR/conf5.d/1.sources
+echo "server 127.123.5.2" > $TEST_DIR/conf5.d/2.sources
+echo "server 127.123.5.3" > $TEST_DIR/conf5.d/3.sources
+
+start_chronyd || test_fail
+wait_for_sync || test_fail
+
+run_chronyc "sources" || test_fail
+check_chronyc_output "^[^=]*
+=*
+.. 127\.123\.1\.1 [^^]*
+.. 127\.123\.1\.3 [^^]*
+.. 127\.123\.1\.4 [^^]*
+.. 127\.123\.3\.1 [^^]*
+.. 127\.123\.2\.2 [^^]*
+.. 127\.123\.2\.3 [^^]*
+.. 127\.123\.4\.4 [^^]*
+.. 127\.123\.1\.2 [^^]*
+.. 127\.123\.5\.1 [^^]*
+.. 127\.123\.5\.2 [^^]*
+.. 127\.123\.5\.3 [^^]*$" || test_fail
+
+rm $TEST_DIR/conf5.d/1.sources
+echo "server 127.123.5.2 minpoll 7" > $TEST_DIR/conf5.d/2.sources
+echo > $TEST_DIR/conf5.d/3.sources
+echo "server 127.123.5.4" > $TEST_DIR/conf5.d/4.sources
+
+run_chronyc "reload sources" || test_fail
+
+run_chronyc "sources" || test_fail
+check_chronyc_output "^[^=]*
+=*
+.. 127\.123\.1\.1 [^^]*
+.. 127\.123\.1\.3 [^^]*
+.. 127\.123\.1\.4 [^^]*
+.. 127\.123\.3\.1 [^^]*
+.. 127\.123\.2\.2 [^^]*
+.. 127\.123\.2\.3 [^^]*
+.. 127\.123\.4\.4 [^^]*
+.. 127\.123\.1\.2 *0   6 [^^]*
+.. 127\.123\.5\.2 *0   7 [^^]*
+.. 127\.123\.5\.4 [^^]*$" || test_fail
+
+stop_chronyd || test_fail
+
+test_pass

test/system/009-binddevice

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+[ "$(uname -s)" = "Linux" ] || test_skip "non-Linux system"
+
+test_start "binddevice directives"
+
+extra_chronyd_directives="
+binddevice lo
+bindacqdevice lo
+bindcmddevice lo"
+
+start_chronyd || test_fail
+wait_for_sync || test_fail
+
+run_chronyc "ntpdata $server" || test_fail
+check_chronyc_output "^Remote address" || test_fail
+
+stop_chronyd || test_fail
+check_chronyd_messages || test_fail
+check_chronyd_files || test_fail
+
+test_pass

test/system/102-hwtimestamp

@@ -7,7 +7,7 @@
 hwts_iface=""
 for iface_path in /sys/class/net/*; do
 	iface=$(basename "$iface_path")
-	if ethtool -T "$iface" 2> /dev/null | grep -q HWTSTAMP_FILTER_ALL; then
+	if ethtool -T "$iface" 2> /dev/null | grep -q '	all\($\| \)'; then
 		hwts_iface="$iface"
 		break
 	fi

test/system/105-nts

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+. ./test.common
+
+server_name="chrony-nts-test"
+
+check_chronyd_features NTS || test_skip "NTS support disabled"
+certtool --help &> /dev/null || test_skip "certtool missing"
+sed -i "/ $server_name\$/d" /etc/hosts && echo "$server $server_name" >> /etc/hosts || \
+	test_skip "Cannot modify /etc/hosts"
+
+check_chronyd_features PRIVDROP && user="nobody"
+
+test_start "NTS authentication"
+
+cat > $TEST_DIR/cert.cfg <<EOF
+cn = "$server_name"
+serial = 001
+activation_date = "$(date -d '1 year ago' +'%Y-%m-%d') 00:00:00 UTC"
+expiration_date = "$(date -d '1 year' +'%Y-%m-%d') 00:00:00 UTC"
+signing_key
+encryption_key
+EOF
+
+certtool --generate-privkey --key-type=ed25519 --outfile $TEST_DIR/server.key \
+	&> $TEST_DIR/certtool.log
+certtool --generate-self-signed --load-privkey $TEST_DIR/server.key \
+	--template $TEST_DIR/cert.cfg --outfile $TEST_DIR/server.crt &>> $TEST_DIR/certtool.log
+chown $user $TEST_DIR/server.*
+
+ntpport=$(get_free_port)
+ntsport=$(get_free_port)
+
+server_options="port $ntpport nts ntsport $ntsport"
+extra_chronyd_directives="
+port $ntpport
+ntsport $ntsport
+ntsserverkey $TEST_DIR/server.key
+ntsservercert $TEST_DIR/server.crt
+ntstrustedcerts $TEST_DIR/server.crt
+ntsdumpdir $TEST_LIBDIR
+ntsprocesses 3"
+
+start_chronyd || test_fail
+sleep 3
+
+run_chronyc "authdata" || test_fail
+check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================
+127\.0\.0\.1                    NTS     1   15  256    [0-9]    0    0    [78]  100$" || test_fail
+
+stop_chronyd || test_fail
+check_chronyd_messages || test_fail
+check_chronyd_files || test_fail
+
+rm -f $TEST_LOGDIR/measurements.log
+
+server_options="port $ntpport nts ntsport $((ntsport + 1))"
+
+start_chronyd || test_fail
+sleep 2
+
+run_chronyc "authdata" || test_fail
+check_chronyc_output "^Name/IP address             Mode KeyID Type KLen Last Atmp  NAK Cook CLen
+=========================================================================
+127\.0\.0\.1                    NTS     1   15  256    [0-9]    0    0    [78]  100$" || test_fail
+
+stop_chronyd || test_fail
+check_chronyd_messages || test_fail
+check_chronyd_files || test_fail
+
+test_pass

test/system/test.common

@@ -97,6 +97,8 @@ default_extra_chronyd_directives=""
 default_extra_chronyd_options=""
 default_clock_control=0
 default_server=127.0.0.1
+default_server_name=127.0.0.1
+default_server_options=""
 default_user=root
 
 # Initialize test settings from their defaults
@@ -178,7 +180,7 @@ get_free_port() {
 
 	while true; do
 		port=$((RANDOM % 10000 + 10000))
-		netstat -aln | grep '^udp.*:'$port && continue
+		netstat -aln | grep '^\(tcp\|udp\).*[:.]'"$port " && continue
 		break
 	done
 
@@ -210,7 +212,7 @@ generate_chrony_conf() {
 		echo "cmdallow"
 		echo "local"
 
-		echo "server $server port $ntpport minpoll -6 maxpoll -6"
+		echo "server $server_name port $ntpport minpoll -6 maxpoll -6 $server_options"
 
 		[ "$server" = "127.0.0.1" ] && echo "bindacqaddress $server"
 		echo "bindaddress 127.0.0.1"

test/unit/Makefile.in

@@ -12,7 +12,8 @@ TEST_OBJS := $(sort $(patsubst %.c,%.o,$(wildcard *.c)))
 TESTS := $(patsubst %.o,%.test,$(filter-out $(SHARED_OBJS),$(TEST_OBJS)))
 
 CHRONYD_OBJS := $(patsubst %.o,$(CHRONY_SRCDIR)/%.o,$(filter-out main.o,\
-		  $(filter %.o,$(shell $(MAKE) -f $(CHRONY_SRCDIR)/Makefile print-chronyd-objects))))
+		  $(filter %.o,$(shell $(MAKE) -f $(CHRONY_SRCDIR)/Makefile \
+					print-chronyd-objects NODEPS=1))))
 
 all: $(TESTS)
 

test/unit/clientlog.c

@@ -29,12 +29,14 @@ void
 test_unit(void)
 {
   int i, j, index;
+  CLG_Service s;
   struct timespec ts;
   IPAddr ip;
   char conf[][100] = {
     "clientloglimit 10000",
     "ratelimit interval 3 burst 4 leak 3",
     "cmdratelimit interval 3 burst 4 leak 3",
+    "ntsratelimit interval 6 burst 8 leak 3",
   };
 
   CNF_Initialise(0, 0);
@@ -55,15 +57,10 @@ test_unit(void)
       TST_GetRandomAddress(&ip, IPADDR_UNSPEC, i % 8 ? -1 : i / 8 % 9);
       DEBUG_LOG("address %s", UTI_IPToString(&ip));
 
-      if (random() % 2) {
+      s = random() % MAX_SERVICES;
-        index = CLG_LogNTPAccess(&ip, &ts);
+      index = CLG_LogServiceAccess(s, &ip, &ts);
-        TEST_CHECK(index >= 0);
+      TEST_CHECK(index >= 0);
-        CLG_LimitNTPResponseRate(index);
+      CLG_LimitServiceRate(s, index);
-      } else {
-        index = CLG_LogCommandAccess(&ip, &ts);
-        TEST_CHECK(index >= 0);
-        CLG_LimitCommandResponseRate(index);
-      }
 
       UTI_AddDoubleToTimespec(&ts, (1 << random() % 14) / 100.0, &ts);
     }
@@ -72,11 +69,13 @@ test_unit(void)
   DEBUG_LOG("records %u", ARR_GetSize(records));
   TEST_CHECK(ARR_GetSize(records) == 64);
 
+  s = CLG_NTP;
+
   for (i = j = 0; i < 10000; i++) {
     ts.tv_sec += 1;
-    index = CLG_LogNTPAccess(&ip, &ts);
+    index = CLG_LogServiceAccess(s, &ip, &ts);
     TEST_CHECK(index >= 0);
-    if (!CLG_LimitNTPResponseRate(index))
+    if (!CLG_LimitServiceRate(s, index))
       j++;
   }
 

test/unit/cmac.c

@@ -22,6 +22,7 @@
 #include <sysincl.h>
 #include <cmac.h>
 #include <logging.h>
+#include <util.h>
 #include "test.h"
 
 #define MAX_KEY_LENGTH 64
@@ -30,9 +31,9 @@
 struct cmac_test {
   const char *name;
   const unsigned char key[MAX_KEY_LENGTH];
-  unsigned int key_length;
+  int key_length;
   const unsigned char hash[MAX_HASH_LENGTH];
-  unsigned int hash_length;
+  int hash_length;
 };
 
 void
@@ -49,29 +50,36 @@ test_unit(void)
     { "", "", 0, "", 0 }
   };
 
+  CMC_Algorithm algorithm;
   CMC_Instance inst;
-  unsigned int length;
+  int i, j, length;
-  int i, j;
 
 #ifndef HAVE_CMAC
   TEST_REQUIRE(0);
 #endif
 
+  TEST_CHECK(CMC_INVALID == 0);
+
   for (i = 0; tests[i].name[0] != '\0'; i++) {
-    TEST_CHECK(CMC_GetKeyLength(tests[i].name) == tests[i].key_length);
+    algorithm = UTI_CmacNameToAlgorithm(tests[i].name);
+    TEST_CHECK(algorithm != 0);
+    TEST_CHECK(CMC_GetKeyLength(algorithm) == tests[i].key_length);
 
     DEBUG_LOG("testing %s", tests[i].name);
 
-    for (j = 0; j <= 128; j++) {
+    for (j = -1; j <= 128; j++) {
       if (j == tests[i].key_length)
         continue;
-      TEST_CHECK(!CMC_CreateInstance(tests[i].name, tests[i].key, j));
+      TEST_CHECK(!CMC_CreateInstance(algorithm, tests[i].key, j));
     }
 
-    inst = CMC_CreateInstance(tests[i].name, tests[i].key, tests[i].key_length);
+    inst = CMC_CreateInstance(algorithm, tests[i].key, tests[i].key_length);
     TEST_CHECK(inst);
 
-    TEST_CHECK(!CMC_CreateInstance("nosuchcipher", tests[i].key, tests[i].key_length));
+    TEST_CHECK(!CMC_CreateInstance(0, tests[i].key, tests[i].key_length));
+
+    TEST_CHECK(CMC_Hash(inst, data, -1, hash, sizeof (hash)) == 0);
+    TEST_CHECK(CMC_Hash(inst, data, sizeof (data) - 1, hash, -1) == 0);
 
     for (j = 0; j <= sizeof (hash); j++) {
       memset(hash, 0, sizeof (hash));

test/unit/hash.c

@@ -22,12 +22,13 @@
 #include <sysincl.h>
 #include <hash.h>
 #include <logging.h>
+#include <util.h>
 #include "test.h"
 
 struct hash_test {
   const char *name;
   const unsigned char out[MAX_HASH_LENGTH];
-  unsigned int length;
+  int length;
 };
 
 void
@@ -69,27 +70,35 @@ test_unit(void)
     { "", "", 0 }
   };
 
-  unsigned int length;
+  HSH_Algorithm algorithm;
-  int i, j, hash_id;
+  int i, j, hash_id, length;
+
+  TEST_CHECK(HSH_INVALID == 0);
 
   for (i = 0; tests[i].name[0] != '\0'; i++) {
-    hash_id = HSH_GetHashId(tests[i].name);
+    algorithm = UTI_HashNameToAlgorithm(tests[i].name);
+    TEST_CHECK(algorithm != 0);
+    hash_id = HSH_GetHashId(algorithm);
     if (hash_id < 0) {
-      TEST_CHECK(strcmp(tests[i].name, "MD5"));
+      TEST_CHECK(algorithm != HSH_MD5);
 #ifdef FEAT_SECHASH
-      TEST_CHECK(strcmp(tests[i].name, "SHA1"));
+      TEST_CHECK(algorithm != HSH_SHA1);
-      TEST_CHECK(strcmp(tests[i].name, "SHA256"));
+      TEST_CHECK(algorithm != HSH_SHA256);
-      TEST_CHECK(strcmp(tests[i].name, "SHA384"));
+      TEST_CHECK(algorithm != HSH_SHA384);
-      TEST_CHECK(strcmp(tests[i].name, "SHA512"));
+      TEST_CHECK(algorithm != HSH_SHA512);
 #endif
       continue;
     }
 
     DEBUG_LOG("testing %s", tests[i].name);
 
+    TEST_CHECK(HSH_Hash(hash_id, data1, -1, NULL, 0, out, sizeof (out)) == 0);
+    TEST_CHECK(HSH_Hash(hash_id, data1, sizeof (data1) - 1, data2, -1, out, sizeof (out)) == 0);
+    TEST_CHECK(HSH_Hash(hash_id, data1, sizeof (data1) - 1, NULL, 0, out, -1) == 0);
+
     for (j = 0; j <= sizeof (out); j++) {
-      TEST_CHECK(HSH_GetHashId(tests[i].name) == hash_id);
+      TEST_CHECK(HSH_GetHashId(algorithm) == hash_id);
-      TEST_CHECK(HSH_GetHashId("nosuchhash") < 0);
+      TEST_CHECK(HSH_GetHashId(0) < 0);
 
       memset(out, 0, sizeof (out));
       length = HSH_Hash(hash_id, data1, sizeof (data1) - 1, data2, sizeof (data2) - 1,

test/unit/keys.c

@@ -99,7 +99,7 @@ generate_key_file(const char *name, uint32_t *keys)
 void
 test_unit(void)
 {
-  int i, j, data_len, auth_len;
+  int i, j, data_len, auth_len, type, bits;
   uint32_t keys[KEYS], key;
   unsigned char data[100], auth[MAX_HASH_LENGTH];
   char conf[][100] = {
@@ -125,7 +125,6 @@ test_unit(void)
 
     for (j = 0; j < KEYS; j++) {
       TEST_CHECK(KEY_KeyKnown(keys[j]));
-      TEST_CHECK(KEY_GetAuthDelay(keys[j]) >= 0);
       TEST_CHECK(KEY_GetAuthLength(keys[j]) >= 16);
 
       data_len = random() % (sizeof (data) + 1);
@@ -144,12 +143,16 @@ test_unit(void)
 
       auth[auth_len - 1]++;
       TEST_CHECK(!KEY_CheckAuth(keys[j], data, data_len, auth, auth_len, auth_len));
+
+      TEST_CHECK(KEY_GetKeyInfo(keys[j], &type, &bits));
+      TEST_CHECK(type > 0 && bits > 0);
     }
 
     for (j = 0; j < 1000; j++) {
       UTI_GetRandomBytes(&key, sizeof (key));
       if (KEY_KeyKnown(key))
         continue;
+      TEST_CHECK(!KEY_GetKeyInfo(key, &type, &bits));
       TEST_CHECK(!KEY_GenerateAuth(key, data, data_len, auth, sizeof (auth)));
       TEST_CHECK(!KEY_CheckAuth(key, data, data_len, auth, auth_len, auth_len));
     }