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//usr/share/doc/chrony/NEWS
New in version 4.8 ================== Enhancements ------------ * Add maxunreach option to limit selection of unreachable sources * Add -u option to chronyc to drop root privileges (default chronyc user is set by configure script) Bug fixes --------- * Hide chronyc socket to mitigate unsafe permissions change * Fix refclock extpps option to work on Linux >= 6.15 * Validate refclock samples for reachability updates New in version 4.7 ================== Enhancements ------------ * Add opencommands directive to select remote monitoring commands * Add interval option to driftfile directive * Add waitsynced and waitunsynced options to local directive * Add sanity checks for integer values in configuration * Add support for systemd Type=notify service * Add RTC refclock driver * Allow PHC refclock to be specified with network interface name * Don't require multiple refclock samples per poll to simplify filter configuration * Keep refclock reachable when dropping samples with large delay * Improve quantile-based filtering to adapt faster to larger delay * Improve logging of selection failures * Detect clock interference from other processes * Try to reopen message log (-l option) on cyclelogs command Bug fixes --------- * Fix sourcedir reloading to not multiply sources * Fix tracking offset after failed clock step Removed features ---------------- * Drop support for NTS with Nettle < 3.6 and GnuTLS < 3.6.14 * Drop support for building without POSIX threads New in version 4.6.1 ==================== Enhancements ------------ * Add ntsaeads directive to enable only selected AEAD algorithms for NTS Workarounds ----------- * Negotiate use of compliant NTS keys with AES-128-GCM-SIV AEAD algorithm (by default the keys are generated differently than in RFC 8915 for compatibility with chrony server and client versions 4.4, 4.5, and 4.6) * Switch to compliant NTS keys if first response from server is NTS NAK New in version 4.6 ================== Enhancements ------------ * Add activate option to local directive to set activation threshold * Add ipv4 and ipv6 options to server/pool/peer directive * Add kod option to ratelimit directive for server KoD RATE support * Add leapseclist directive to read NIST/IERS leap-seconds.list file * Add ptpdomain directive to set PTP domain for NTP over PTP * Allow disabling pidfile * Improve copy server option to accept unsynchronised status instantly * Log one selection failure on start * Add offset command to modify source offset correction * Add timestamp sources to ntpdata report Bug fixes --------- * Fix crash on sources reload during initstepslew or RTC initialisation * Fix source refreshment to not repeat failed name resolving attempts New in version 4.5 ================== Enhancements ------------ * Add support for AES-GCM-SIV in GnuTLS * Add support for corrections from PTP transparent clocks * Add support for systemd socket activation Bug fixes --------- * Fix presend in interleaved mode * Fix reloading of modified sources from sourcedir New in version 4.4 ================== Enhancements ------------ * Add support for AES-GCM-SIV with Nettle >= 3.9 to shorten NTS cookies to avoid some length-specific blocking of NTP on Internet * Add support for multiple refclocks using extpps option on one PHC * Add maxpoll option to hwtimestamp directive to improve PHC tracking with low packet rates * Add hwtstimeout directive to configure timeout for late timestamps * Handle late hardware transmit timestamps of NTP requests on all sockets * Handle mismatched 32/64-bit time_t in SOCK refclock samples * Improve source replacement * Log important changes made by command requests (chronyc) * Refresh address of NTP sources periodically * Request nanosecond kernel RX timestamping on FreeBSD * Set DSCP for IPv6 packets * Shorten NTS-KE retry interval when network is down * Update seccomp filter for musl * Warn if loading keys from file with unexpected permissions * Warn if source selection fails or falseticker is detected * Add selectopts command to modify source-specific selection options * Add timestamp sources to serverstats report and make its fields 64-bit * Add -e option to chronyc to indicate end of response New in version 4.3 ================== Enhancements ------------ * Add local option to refclock directive to stabilise system clock with more stable free-running clock (e.g. TCXO, OCXO) * Add maxdelayquant option to server/pool/peer directive to replace maxdelaydevratio filter with long-term quantile-based filtering * Add selection option to log directive * Allow external PPS in PHC refclock without configurable pin * Don't accept first interleaved response to minimise error in delay * Don't use arc4random on Linux to avoid server performance loss * Improve filter option to better handle missing NTP samples * Improve stability with hardware timestamping and PHC refclock * Update seccomp filter Bug fixes --------- * Fix waitsync command to reconnect when not getting response New in version 4.2 ================== Enhancements ------------ * Add support for NTPv4 extension field improving synchronisation stability and resolution of root delay and dispersion (experimental) * Add support for NTP over PTP (experimental) * Add support for AES-CMAC and hash functions in GnuTLS * Improve server interleaved mode to be more reliable and support multiple clients behind NAT * Update seccomp filter * Add statistics about interleaved mode to serverstats report Bug fixes --------- * Fix RTC support with 64-bit time_t on 32-bit Linux * Fix seccomp filter to work correctly with bind*device directives * Suppress kernel adjustments of system clock (dosynctodr) on illumos Other changes ------------- * Switch Solaris support to illumos New in version 4.1 ================== Enhancements ------------ * Add support for NTS servers specified by IP address (matching Subject Alternative Name in server certificate) * Add source-specific configuration of trusted certificates * Allow multiple files and directories with trusted certificates * Allow multiple pairs of server keys and certificates * Add copy option to server/pool directive * Increase PPS lock limit to 40% of pulse interval * Perform source selection immediately after loading dump files * Reload dump files for addresses negotiated by NTS-KE server * Update seccomp filter and add less restrictive level * Restart ongoing name resolution on online command Bug fixes --------- * Fix responding to IPv4 command requests on FreeBSD * Fix dump files to not include uncorrected offset * Fix initstepslew to accept time from own NTP clients * Reset NTP address and port when no longer negotiated by NTS-KE server New in version 4.0 ================== Enhancements ------------ * Add support for Network Time Security (NTS) authentication * Add support for AES-CMAC keys (AES128, AES256) with Nettle * 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 some commands to print also unresolved sources * 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 ================== Enhancements ------------ * Add support for more accurate reading of PHC on Linux 5.0 * Add support for hardware timestamping on interfaces with read-only timestamping configuration * Add support for memory locking and real-time priority on FreeBSD, NetBSD, Solaris * Update seccomp filter to work on more architectures * Validate refclock driver options Bug fixes --------- * Fix bindaddress directive on FreeBSD * Fix transposition of hardware RX timestamp on Linux 4.13 and later * Fix building on non-glibc systems New in version 3.4 ================== Enhancements ------------ * Add filter option to server/pool/peer directive * Add minsamples and maxsamples options to hwtimestamp directive * Add support for faster frequency adjustments in Linux 4.19 * Change default pidfile to /var/run/chrony/chronyd.pid to allow chronyd without root privileges to remove it on exit * Disable sub-second polling intervals for distant NTP sources * Extend range of supported sub-second polling intervals * Get/set IPv4 destination/source address of NTP packets on FreeBSD * Make burst options and command useful with short polling intervals * Modify auto_offline option to activate when sending request failed * Respond from interface that received NTP request if possible * Add onoffline command to switch between online and offline state according to current system network configuration * Improve example NetworkManager dispatcher script Bug fixes --------- * Avoid waiting in Linux getrandom system call * Fix PPS support on FreeBSD and NetBSD New in version 3.3 ================== Enhancements ------------ * Add burst option to server/pool directive * Add stratum and tai options to refclock directive * Add support for Nettle crypto library * Add workaround for missing kernel receive timestamps on Linux * Wait for late hardware transmit timestamps * Improve source selection with unreachable sources * Improve protection against replay attacks on symmetric mode * Allow PHC refclock to use socket in /var/run/chrony * Add shutdown command to stop chronyd * Simplify format of response to manual list command * Improve handling of unknown responses in chronyc Bug fixes --------- * Respond to NTPv1 client requests with zero mode * Fix -x option to not require CAP_SYS_TIME under non-root user * Fix acquisitionport directive to work with privilege separation * Fix handling of socket errors on Linux to avoid high CPU usage * Fix chronyc to not get stuck in infinite loop after clock step New in version 3.2 ================== Enhancements ------------ * Improve stability with NTP sources and reference clocks * Improve stability with hardware timestamping * Improve support for NTP interleaved modes * Control frequency of system clock on macOS 10.13 and later * Set TAI-UTC offset of system clock with leapsectz directive * Minimise data in client requests to improve privacy * Allow transmit-only hardware timestamping * Add support for new timestamping options introduced in Linux 4.13 * Add root delay, root dispersion and maximum error to tracking log * Add mindelay and asymmetry options to server/peer/pool directive * Add extpps option to PHC refclock to timestamp external PPS signal * Add pps option to refclock directive to treat any refclock as PPS * Add width option to refclock directive to filter wrong pulse edges * Add rxfilter option to hwtimestamp directive * Add -x option to disable control of system clock * Add -l option to log to specified file instead of syslog * Allow multiple command-line options to be specified together * Allow starting without root privileges with -Q option * Update seccomp filter for new glibc versions * Dump history on exit by default with dumpdir directive * Use hardening compiler options by default Bug fixes --------- * Don't drop PHC samples with low-resolution system clock * Ignore outliers in PHC tracking, RTC tracking, manual input * Increase polling interval when peer is not responding * Exit with error message when include directive fails * Don't allow slash after hostname in allow/deny directive/command * Try to connect to all addresses in chronyc before giving up New in version 3.1 ================== Enhancements ------------ * Add support for precise cross timestamping of PHC on Linux * Add minpoll, precision, nocrossts options to hwtimestamp directive * Add rawmeasurements option to log directive and modify measurements option to log only valid measurements from synchronised sources * Allow sub-second polling interval with NTP sources Bug fixes --------- * Fix time smoothing in interleaved mode New in version 3.0 ================== Enhancements ------------ * Add support for software and hardware timestamping on Linux * Add support for client/server and symmetric interleaved modes * Add support for MS-SNTP authentication in Samba * Add support for truncated MACs in NTPv4 packets * Estimate and correct for asymmetric network jitter * Increase default minsamples and polltarget to improve stability with very low jitter * Add maxjitter directive to limit source selection by jitter * Add offset option to server/pool/peer directive * Add maxlockage option to refclock directive * Add -t option to chronyd to exit after specified time * Add partial protection against replay attacks on symmetric mode * Don't reset polling interval when switching sources to online state * Allow rate limiting with very short intervals * Improve maximum server throughput on Linux and NetBSD * Remove dump files after start * Add tab-completion to chronyc with libedit/readline * Add ntpdata command to print details about NTP measurements * Allow all source options to be set in add server/peer command * Indicate truncated addresses/hostnames in chronyc output * Print reference IDs as hexadecimal numbers to avoid confusion with IPv4 addresses Bug fixes --------- * Fix crash with disabled asynchronous name resolving New in version 2.4.1 ==================== Bug fixes --------- * Fix processing of kernel timestamps on non-Linux systems * Fix crash with smoothtime directive * Fix validation of refclock sample times * Fix parsing of refclock directive New in version 2.4 ================== Enhancements ------------ * Add orphan option to local directive for orphan mode compatible with ntpd * Add distance option to local directive to set activation threshold (1 second by default) * Add maxdrift directive to set maximum allowed drift of system clock * Try to replace NTP sources exceeding maximum distance * Randomise source replacement to avoid getting stuck with bad sources * Randomise selection of sources from pools on start * Ignore reference timestamp as ntpd doesn't always set it correctly * Modify tracking report to use same values as seen by NTP clients * Add -c option to chronyc to write reports in CSV format * Provide detailed manual pages Bug fixes --------- * Fix SOCK refclock to work correctly when not specified as last refclock * Fix initstepslew and -q/-Q options to accept time from own NTP clients * Fix authentication with keys using 512-bit hash functions * Fix crash on exit when multiple signals are received * Fix conversion of very small floating-point numbers in command packets Removed features ---------------- * Drop documentation in Texinfo format New in version 2.3 ================== Enhancements ------------ * Add support for NTP and command response rate limiting * Add support for dropping root privileges on Mac OS X, FreeBSD, Solaris * Add require and trust options for source selection * Enable logchange by default (1 second threshold) * Set RTC on Mac OS X with rtcsync directive * Allow binding to NTP port after dropping root privileges on NetBSD * Drop CAP_NET_BIND_SERVICE capability on Linux when NTP port is disabled * Resolve names in separate process when seccomp filter is enabled * Replace old records in client log when memory limit is reached * Don't reveal local time and synchronisation state in client packets * Don't keep client sockets open for longer than necessary * Ignore poll in KoD RATE packets as ntpd doesn't always set it correctly * Warn when using keys shorter than 80 bits * Add keygen command to generate random keys easily * Add serverstats command to report NTP and command packet statistics Bug fixes --------- * Fix clock correction after making step on Mac OS X * Fix building on Solaris New in version 2.2.1 ==================== Security fixes -------------- * Restrict authentication of NTP server/peer to specified key (CVE-2016-1567) New in version 2.2 ================== Enhancements ------------ * Add support for configuration and monitoring over Unix domain socket (accessible by root or chrony user when root privileges are dropped) * Add support for system call filtering with seccomp on Linux (experimental) * Add support for dropping root privileges on NetBSD * Control frequency of system clock on FreeBSD, NetBSD, Solaris * Add system leap second handling mode on FreeBSD, NetBSD, Solaris * Add dynamic drift removal on Mac OS X * Add support for setting real-time priority on Mac OS X * Add maxdistance directive to limit source selection by root distance (3 seconds by default) * Add refresh command to get new addresses of NTP sources * Allow wildcard patterns in include directive * Restore time from driftfile with -s option if later than RTC time * Add configure option to set default hwclockfile * Add -d option to chronyc to enable debug messages * Allow multiple addresses to be specified for chronyc with -h option and reconnect when no valid reply is received * Make check interval in waitsync command configurable Bug fixes --------- * Fix building on NetBSD, Solaris * Restore time from driftfile with -s option if reading RTC failed Removed features ---------------- * Drop support for authentication with command key (run-time configuration is now allowed only for local users that can access the Unix domain socket) New in version 2.1.1 ==================== Bug fixes --------- * Fix clock stepping by integer number of seconds on Linux New in version 2.1 ================== Enhancements ------------ * Add support for Mac OS X * Try to replace unreachable and falseticker servers/peers specified by name like pool sources * Add leaponly option to smoothtime directive to allow synchronised leap smear between multiple servers * Use specific reference ID when smoothing served time * Add smoothing command to report time smoothing status * Add smoothtime command to activate or reset time smoothing Bug fixes --------- * Fix crash in source selection with preferred sources * Fix resetting of time smoothing * Include packet precision in peer dispersion * Fix crash in chronyc on invalid command syntax New in version 2.0 ================== Enhancements ------------ * Update to NTP version 4 (RFC 5905) * Add pool directive to specify pool of NTP servers * Add leapsecmode directive to select how to correct clock for leap second * Add smoothtime directive to smooth served time and enable leap smear * Add minsources directive to set required number of selectable sources * Add minsamples and maxsamples options for all sources * Add tempcomp configuration with list of points * Allow unlimited number of NTP sources, refclocks and keys * Allow unreachable sources to remain selected * Improve source selection * Handle offline sources as unreachable * Open NTP server port only when necessary (client access is allowed by allow directive/command or peer/broadcast is configured) * Change default bindcmdaddress to loopback address * Change default maxdelay to 3 seconds * Change default stratumweight to 0.001 * Update adjtimex synchronisation status * Use system headers for adjtimex * Check for memory allocation errors * Reduce memory usage * Add configure options to compile without NTP, cmdmon, refclock support * Extend makestep command to set automatic clock stepping Bug fixes --------- * Add sanity checks for time and frequency offset * Don't report synchronised status during leap second * Don't combine reference clocks with close NTP sources * Fix accepting requests from configured sources * Fix initial fallback drift setting New in version 1.31.1 ===================== Security fixes -------------- * Protect authenticated symmetric NTP associations against DoS attacks (CVE-2015-1853) * Fix access configuration with subnet size indivisible by 4 (CVE-2015-1821) * Fix initialization of reply slots for authenticated commands (CVE-2015-1822) New in version 1.31 =================== Enhancements ------------ * Support operation in other NTP eras (next era begins in 2036), NTP time is mapped to [-50, +86] years around build date by default * Restore time from driftfile with -s when RTC is missing/unsupported * Close connected client sockets when not waiting for reply * Use one client socket with random port when acquisitionport is 0 * Use NTP packets instead of UDP echo for presend * Don't adjust polling interval when sending fails * Allow binding to addresses that don't exist yet * Ignore measurements around leap second * Improve detection of unexpected time jumps * Include example of logrotate configuration, systemd services and NetworkManager dispatcher script Bug fixes --------- * Reconnect client sockets for each request to follow changes in network configuration automatically * Restart timer when polling interval is changed on reset New in version 1.30 =================== Enhancements ------------ * Add asynchronous name resolving with POSIX threads * Add PTP hardware clock (PHC) refclock driver * Add new generic clock driver to slew by adjusting frequency only (without kernel PLL or adjtime) and use it on Linux * Add rtcautotrim directive to trim RTC automatically * Add hwclockfile directive to share RTC LOCAL/UTC setting with hwclock * Add maxslewrate directive to set maximum allowed slew rate * Add maxdispersion option for refclocks * Add -q/-Q options to set clock/print offset once and exit * Allow directives to be specified on chronyd command line * Replace frequency scaling in Linux driver with retaining of tick * Try to detect unexpected forward time jumps and reset state * Exit with non-zero code when maxchange limit is reached * Improve makestep to not start and stop slew unnecessarily * Change default corrtimeratio to 3.0 to improve frequency accuracy * Announce leap second only on last day of June and December * Use separate connected client sockets for each NTP server * Remove separate NTP implementation used for initstepslew * Limit maximum minpoll set by KoD RATE to default maxpoll * Don't send NTP requests with unknown key * Print warning when source is added with unknown key * Take leap second in PPS refclock from locked source * Make reading of RTC for initial trim more reliable * Don't create cmdmon sockets when cmdport is 0 * Add configure option to set default user to drop root privileges * Add configure option to compile with debug messages * Print debug messages when -d is used more than once * Change format of messages written to terminal with -d * Write fatal messages also to stderr with -n * Use IP_RECVERR socket option in chronyc to not wait unnecessarily * Shorten default chronyc timeout for localhost * Change default hostname in chronyc from localhost to 127.0.0.1 * Print error message on invalid syntax with all chronyc commands * Include simulation test suite using clknetsim Bug fixes --------- * Fix crash when selecting with multiple preferred sources * Fix frequency calculation with large frequency offsets * Fix code writing drift and RTC files to compile correctly * Fix -4/-6 options in chronyc to not reset hostname set by -h * Fix refclock sample validation with sub-second polling interval * Set stratum correctly with non-PPS SOCK refclock and local stratum * Modify dispersion accounting in refclocks to prevent PPS getting stuck with large dispersion and not accepting new samples New in version 1.29.1 ===================== Security fixes -------------- * Modify chronyc protocol to prevent amplification attacks (CVE-2014-0021) (incompatible with previous protocol version, chronyc supports both) New in version 1.29 =================== Security fixes -------------- * Fix crash when processing crafted commands (CVE-2012-4502) (possible with IP addresses allowed by cmdallow and localhost) * Don't send uninitialized data in SUBNETS_ACCESSED and CLIENT_ACCESSES replies (CVE-2012-4503) (not used by chronyc) Other changes ------------- * Drop support for SUBNETS_ACCESSED and CLIENT_ACCESSES commands New in version 1.28 =================== * Combine sources to improve accuracy * Make config and command parser strict * Add -a option to chronyc to authenticate automatically * Add -R option to ignore initstepslew and makestep directives * Add generatecommandkey, minsamples, maxsamples and user directives * Improve compatibility with NTPv1 and NTPv2 clients * Create sockets only in selected family with -4/-6 option * Treat address bind errors as non-fatal * Extend tracking log * Accept float values as initstepslew threshold * Allow hostnames in offline, online and burst commands * Fix and improve peer polling * Fix crash in config parsing with too many servers * Fix crash with duplicated initstepslew address * Fix delta calculation with extreme frequency offsets * Set local stratum correctly * Remove unnecessary adjtimex calls * Set paths in documentation by configure * Update chrony.spec New in version 1.27 =================== * Support for stronger keys via NSS or libtomcrypt library * Support reading leap second data from tz database * Support for precise clock stepping on Linux * Support for nanoseconds in SHM refclock * Make offset corrections smoother on Linux * Make transmit timestamps random below clock precision * Add corrtimeratio and maxchange directives * Extend tracking, sources and activity reports * Wait in foreground process until daemon is fully initialized * Fix crash with slow name resolving * Fix iburst with jittery sources * Fix offset stored in rtc data right after trimrtc * Fix crash and hang with RTC or manual samples * Don't use readonly adjtime on Linux kernels before 2.6.28 * Changed chronyc protocol, incompatible with older versions New in version 1.26 =================== * Add compatibility with Linux 3.0 and later * Use proper source address in NTP replies on multihomed IPv6 hosts * Accept NTP packets with versions 4, 3 and 2 * Cope with unexpected backward time jumps * Don't reset kernel frequency on start without drift file * Retry on permanent DNS error by default * Add waitsync command New in version 1.25 =================== * Improve accuracy with NTP sources * Improve accuracy with reference clocks * Improve polling interval adjustment * Improve stability with temporary asymmetric delays * Improve source selection * Improve initial synchronisation * Add delayed server name resolving * Add temperature compensation * Add nanosecond slewing to Linux driver * Add fallback drifts * Add iburst, minstratum, maxdelaydevratio, polltarget, prefer, noselect options * Add rtcsync directive to enable Linux 11-minute mode * Add reselectdist, stratumweight, logbanner, maxclockerror, include directives * Add -n option to not detach daemon from terminal * Fix pidfile directive * Fix name resolving with disabled IPv6 support * Fix reloading sample histories with reference clocks * Fix crash with auto_offline option * Fix online command on auto_offline sources * Fix file descriptor leaks * Increase burst polling interval and stop on KoD RATE * Set maxupdateskew to 1000 ppm by default * Require password for clients command * Update drift file at most once per hour * Use system headers for Linux RTC support * Reduce default chronyc timeout and make it configurable * Avoid large values in chronyc sources and sourcestats output * Add reselect command to force reselecting best source * Add -m option to allow multiple commands on command line New in version 1.24 =================== Security fixes -------------- * Don't reply to invalid cmdmon packets (CVE-2010-0292) * Limit client log memory size (CVE-2010-0293) * Limit rate of syslog messages (CVE-2010-0294) Bug fixes/Enhancements ---------------------- * Support for reference clocks (SHM, SOCK, PPS drivers) * IPv6 support * Linux capabilities support (to drop root privileges) * Memory locking support on Linux * Real-time scheduler support on Linux * Leap second support on Linux * Support for editline library * Support for new Linux readonly adjtime * NTP client support for KoD RATE * Read kernel timestamps for received NTP packets * Reply to NTP requests with correct address on multihomed hosts * Retry name resolving after temporary failure * Fix makestep command, make it available on all systems * Add makestep directive for automatic clock stepping * Don't require _bigadj kernel symbol on NetBSD * Avoid blocking read in Linux RTC driver * Support for Linux on S/390 and PowerPC * Fix various bugs on 64-bit systems * Fix valgrind errors and compiler warnings * Improve configure to support common options and variables * Improve status checking and printing in chronyc * Return non-zero exit code on errors in chronyc * Reduce request timeout in chronyc * Print estimated offset in sourcestats * Changed chronyc protocol, incompatible with older versions New in version 1.23 =================== * Support for MIPS, x86_64, sparc, alpha, arm, FreeBSD * Fix serious sign-extension error in handling IP addresses * RTC support can be excluded at compile time * Make sources gcc-4 compatible * Fix various compiler warnings * Handle fluctuations in peer distance better. * Fixed handling of stratum zero. * Fix various problems for 64-bit systems * Flush chronyc output streams after each command, to allow it to be driven through pipes * Manpage improvements Version 1.22 ============ This release number was claimed by a release that Mandriva made to patch important bugs in 1.21. The official numbering has jumped to 1.23 as a consequence. New in version 1.21 =================== * Don't include Linux kernel header files any longer : allows chrony to compile on recent distros. * Stop trying to use RTC if continuous streams of error messages would occur (Linux with HPET). New in version 1.20 =================== * Many small tidy-ups and security improvements * Improve documentation (RTC support in post 2.0 kernels) * Remove trailing \n from syslog messages * Syslog messages now include IP and port number when packet cannot be sent. * Added the "acquisitionport" directive. (Kalle Olavi Niemitalo) * Use uname(2) instead of /proc/version to get kernel version. * Merge support for Linux on Alpha * Merge support for 64bit architectures * Don't link -lm if it's not needed * Fix Solaris build (broken by 64bit change) * Add detection of Linux 2.5 * Allow arbitrary value of HZ in Linux kernel * Fix for chrony.spec on SuSE (Paul Elliot) * Fix handling of initstepslew if no servers are listed (John Hasler) * Fix install rule in Makefile if chronyd is in use (Juliusz Chroboczek) * Replace sprintf by snprintf to remove risk of buffer overrun (John Hasler) * Add --help to configure script New in version 1.19 =================== * Auto-detect kernel's timer interrupt rate (so-called 'HZ') when chronyd starts instead of relying on compiled-in value. * Fix 2 bugs in function that creates the directory for the log and dump files. * Amended webpage URL and contact details. * Generate more informative syslog messages before exiting on failed assertions. * Fix bugs in clamping code for the tick value used when slewing a large offset. * Don't chown files to root during install (should be pointless, and makes RPM building awkward as ordinary user.) * Include chrony.spec file for building RPMs New in version 1.18 =================== * Amend homepage and mailing list information to chrony.sunsite.dk * Delete pidfile on exit from chronyd. * Improvements to readline interface to chronyc * Only generate syslog message when synchronisation is initially lost (instead of on every failed synchronisation attempt) * Use double fork approach when initialising daemon. * More things in contrib directory. * New options to help package builders: --infodir/--mandir for configure, and DESTDIR=xxx for make. (See section 2.2 of chrony.txt for details). * Changed the wording of the messages generated by mailonchange and logchange directives. New in version 1.17 =================== * Port to NetBSD * Configuration supports Linux on PPC * Fix compilation warnings * Several documentation improvements * Bundled manpages (taken from the 'missing manpages project') * Cope with lack of bzero function for Solaris 2.3 systems * Store chronyd's pid in a file (default /var/run/chronyd.pid) and check if chronyd may already be running when starting up. New pidfile directive in configuration file. * Any size subnet is now allowed in allow and deny commands. (Example: 6.7.8/20 or 6.7.8.x/20 (any x) mean a 20 bit subnet). * The environment variables CC and CFLAGS passed to configure can now be used to select the compiler and optimisation/debug options to use * Write syslog messages when chronyd loses synchronisation. * Print GPL text when chronyc is run. * Add NTP broadcast server capability (new broadcast directive). * Add 'auto_offline' option to server/peer (conf file) or add server/peer (via chronyc). * Add 'activity' command to chronyc, to report how many servers/peers are currently online/offline. * Fix long-standing bug with how the system time quantum was calculated. * Include support for systems with HZ!=100 (HZ is the timer interrupt frequency). * Include example chrony.conf and chrony.keys files (examples subdirectory). * Include support for readline in chronyc. New in version 1.16.1 ===================== * Fix compilation problem on Linux 2.4.13 (spinlock.h / spinlock_t) New in version 1.16 =================== * More informative captions for 'sources' and 'sourcestats' commands in chronyc (use 'sources -v' and 'sourcestats -v' to get them). * Correct behaviour for Solaris versions>=2.6 (dosynctodr not required on these versions.) * Remove some compiler warnings (Solaris) * If last line of keys file doesn't have end-of-line, don't truncate final character of that key. * Change timestamp format used in logfiles to make it fully numeric (to aid importing data into spreadsheets etc) * Minor documentation updates and improvements. New in version 1.15 =================== * Add contributed change to 'configure' to support Solaris 2.8 on x86 * Workaround for assertion failure that arises if two received packets occur close together. (Still need to find out why this happens at all.) * Hopefully fix problem where fast slewing was incompatible with machines that have a large background drift rate (=> tick value went out of range for adjtimex() on Linux.) * Fix rtc_linux.c compile problems with 2.4.x kernel include files. * Include support for RTC device not being at /dev/rtc (new rtcdevice directive in configuration file). * Include support for restricting network interfaces for commands (new bindcmdaddress directive in configuration file) * Fix potential linking fault in pktlength.c (use of CROAK macro replaced by normal assert). * Add some material on bug reporting + contributing to the chrony.texi file * Made the chrony.texi file "Vim6-friendly" (removed xrefs on @node lines, added folding markers to chapters + sections.) * Switched over to GPL for the licence New in version 1.14 =================== * Fix compilation for certain other Linux distributions (including Mandrake 7.1) New in version 1.13 =================== * Fixed compilation problems on Redhat/SuSE installations with recent 2.2.x kernels. * Minor tidy-ups and documentation enhancements. * Add support for Linux 2.4 kernels New in version 1.12 =================== * Trial fix for long-standing bug in Linux RTC estimator when system time is slewed. * Fix bug in chronyc if -h is specified without a hostname * Fixes to logging various error conditions when operating in daemon mode. * More stuff under contrib/ * Changes to README file (e.g. about the new chrony-users mailing list) New in version 1.11a ==================== * Minor changes to contact details * Minor changes to installation details (chrony subdirectory under doc/) New in version 1.11 =================== * Improve robustness of installation procedure * Tidy up documenation and contact details * Distribute manual as .txt rather than as .ps * Add -n option to chronyc to work with numeric IP addresses rather than names. * Add material in contrib subdirectory * Improve robustness of handling drift file and RTC coefficients file * Improve robustness of regression algorithm New in version 1.1 ================== Bug fixes --------- * Made linear regression more resistant to rounding errors (old one occasionally generated negative variances which made everything go haywire). Trap infinite or 'not-a-number' values being used to alter system clock to increase robustness further. Other changes/Enhancements -------------------------- * Support for Linux 2.1 and 2.2 kernels * New command 'makestep' in chronyc to immediately jump the system time to match the NTP estimated time (Linux only) - a response to systems booting an hour wrong after summertime/wintertime changes, due to RTCs running on local time. Needs extending to Sun driver files too. * New directives 'logchange' and 'mailonchange' to log to syslog or email to a specific address respectively if chronyd detects a clock offset exceeding a defined threshold. * Added capability to log all client/peer NTP accesses and command accesses (can be turned off with conf file directive 'noclientlog'). Added 'clients' command to chronyc to display this data. * Improved manual mode to use robust regression rather than 2 point fit. * Added 'manual list' and 'manual delete' commands to chronyc to allow display of entered timestamps and discretionary deletion of outliers. * If host goes unsynchronised the dummy IP address 0.0.0.0 is detected to avoid attempting a reverse name lookup (to stop dial on demand IP links from being started) * Changed chronyc/chronyd protocol so messages are now all variable length. Saves on network bandwidth particularly for large replies from chronyd to chronyc (to support the clients command). * Added bindaddress directive to configuration file, to give additional control over limiting which hosts can access the local server. * Groundwork done for a port to Windows NT to compile with Cygwin toolkit. chronyc works (to monitor another host). sys_winnt.c needs finishing to use NT clock control API. Program structure needs adapting to use Windows NT service functions, so it can be started at boot time. Hopefully a Windows NT / Cygwin guru with some spare time can take this port over :-) New in version 1.02 =================== Bug fixes --------- * Fix error messages in chronyc if daemon is not reachable. * Fix config file problem for 'allow all' and 'deny all' without a trailing machine address. * Remove fatal failed assertion if command socket cannot be read from in daemon. * Rewrote timezone handling for Linux real time clock, following various reported problems related to daylight saving. Other changes/Enhancements -------------------------- * Configure script recognizes BSD/386 and uses SunOS 4.1 driver for it. * Log files now print date as day-month-year rather than as a day number. Milliseconds removed from timestamps of logged data. Banners included in file to give meanings of columns. * Only do 1 initial step (followed by a trimming slew) when initialising from RTC on Linux (previously did 2 steps). New in version 1.01 =================== Bug fixes --------- * Handle timezone of RTC correctly with respect to daylight saving time * Syntax check the chronyc 'local' command properly * Fixed assertion failed fault in median finder (used by RTC regression fitting) Other changes/Enhancements -------------------------- * Log selection of new NTP reference source to syslog. * Don't zero-pad IP address fields * Add new command to chronyc to allow logfiles to be cycled. * Extend allow/deny directive syntax in configuration file to so directive can apply to all hosts on the Internet. * Tidy up printout of timestamps to make it clear they are in UTC * Make 'configure' check the processor type as well as the operating system.
