Change Log ========== All relevant changes to the project are documented in this file. [v2.2.1][UNRELEASED] - 2021-01-30 ----------------------- Bug fix release. ### Fixes - Issue #26: Liunx sends `EPIPE` when reading from `/dev/kmsg` if the kernel internal buffers are overrun. `EPIPE` is a heads-up message to userspace that at least one log message has been lost. Usually caused by a too small CONFIG_LOG_BUF_SHIFT value. sysklogd v2.2.0 treated the descriptor as faulty and closed it. The fix is to log the event and restart polling for more messages - Issue #27: Linux log messages read from `/dev/kmsg` are formatted in a different way than its predecessor `/proc/kmsg`. sysklogd v2.2.0 failed to parse the priority field correctly, which caused matching problems with rules in `/etc/syslog.conf` [v2.2.0][] - 2021-01-15 ----------------------- Minor feature and bug fix release. ### Changes - Issue #19: use `/dev/kmsg` instead of `/proc/kmsg` on Linux ### Fixes - Issue #17: Finally fix long-standing parallel build issue, thanks to Windriver for sticking with it and finding a really good fix! - Issue #24: `O_CLOEXEC` not available on all systems - Fix build error; allow loop initial declarations, enable C99 - Fix build warning; missing initializer for field 'usec' [v2.1.2][] - 2020-03-22 ----------------------- Bug fix release. ### Fixes - Issue #17: Windriver found and fixed a race between building lib/*.o files with and without `-fPIC`. This should be the final parallel build issue. [v2.1.1][] - 2020-01-19 ----------------------- Bug fix release. ### Changes - Add unit test to verify rule option parsing - Minor code cleanup and code de-duplication ### Fixes - Issue #11: Some users still reported problems with parallel build, which was worked-around with `.NOTPARALLEL` in [v2.1][]. This v2 fix is a refactor of `src/Makefile.am` which removes `libcompat` and use the same objects for linking both `syslogd` and the user `libsyslog` API. Yet still protecting against symbol poisoning - A Westermo customer reported problems sending to remove syslog sinks at startup. Turns out the handling if `sendmsg()` fails was the same as that if `syslogd` fails to resolve the IP from a DNS name. The fix is to just let `sendmsg()` retry on the next syslog message for all benign/common network errors; `EHOSTUNREACHABLE`, `ENETUNREACH`, etc. - Fix timer reset for suspended remote sinks. For all new incoming syslog messages all suspended (remote) sinks had their timeout mistakenly reset [v2.1][] - 2020-01-05 --------------------- Relicensed under the 3-clause BSD license. ### Changes - `klogd` removed, replaced by native `syslogd` functionality - Import pristine FreeBSD versions of `syslogd` and `syslog.conf` man pages, both under the 3-clause BSD license. - With `klogd` removed and the original man pages replaced with FreeBSD versions, the only remaining GPL'ed material was the build system, which the copyright owner (undersigned) agrees to change to BSD as well. Hence, the GNU GPL could be dropped in favor of 3-clause BSD ### Fixes - Issue #8: Kernel messages duplicated to console. `syslogd` on Linux now calls `klogctl()` to disable kernel logging to console - Earlier versions were slightly sensitive to time skips. I.e., when recording the last-change time on a log file and wall time changed backwards, `syslogd` would consider that log file to have a date in the future. This only affected buffering of multiple messages, and `-- MARK --` so most users never would have noticed - Issue #9: Kernel logging broken if `syslogd` started without `-F` - Issue #10: Fix build on non-GLIBC Linux systems, by Khem Raj - Issue #11: Fix nasty parallel build problem. Also reported by the Gentoo project, and Westermo - Make sure log rotation cannot be enabled for non-file targets - Use `snprintf()` rather than `sprintf()` in log rotation - Fix variable names shadowing global/local defs, found by clang-tidy - Handle multiple invocations of SIGHUP, respond to all of them - Use correct `#ifdef` for checking on Linux or not [v2.0.3][] - 2019-12-01 ----------------------- ### Changes - Always run `domark()` timer, regardless of `-m interval` setting, it is used for internal housekeeping, runs every 15 sec - Handle DNS lookup of unknown remote syslog hosts in `domark()` - Only enable debug mode when `-d` is given on the command line - Always create PID file, even in debug mode - Add `-F`, as alias for `-n`, to klogd for compat. with syslogd ### Fixes - When logging to a remote host using @FQDN previous releases of syslogd gave up after 10 tries. In many industrial cases intermittent access to the DNS is very likely, so this release includes a fix to retry the IP address lookup forever. The interval for retries is configurable - Fix accidental blocking of SIGHUP/SIGALRM when an invalid facility is found in the internal `logmsg()` function - Fix leaking of internal error messages (like DNS lookup failure) to `/dev/console` during reconfiguration, i.e. after initial start [v2.0.2][] - 2019-11-28 ----------------------- ### Changes - Add missing remote:port info in error message when failing to send to a remote syslog server. ### Fixes - Fix `assert()` in `fprintlog_successive()`, caused by never being reset in `fprintlog_first()`, found by Westermo - Issue #6: Workaround for systems with vanilla autoconf 2.69 that does not support `--runstatedir=PATH`, e.g. CRUX [v2.0.1][] - 2019-11-25 ----------------------- Minor bug fix release. ### Changes - Make logger tool and man page optional in build, by Lars Wendler - Expand resulting directories in configure summary ### Fixes - Add missing `-k` and `-T` command line flags to `getopt()` - Issue #3: Don't guess PID file location, use configre's `$runstatedir` [v2.0][] - 2019-11-15 --------------------- This release represents a major refresh of the sysklogd project. The venerable syslogd gets an infusion of new blood from NetBSD and FreeBSD to fully support RFC3164 and RFC5424. Also included is a user library and a replacement for `syslog.h` to enable new features in RFC5424. > Note: as of this release `klogd` is disabled by default, `syslogd` can > read Linux kernel messages on its own now. ### Changes - Support for true RFC3164 formatted log messages to remote log servers, including timestamp and hostname. Use `;RFC3161` rule option - Support for RFC5424 from UNIX domain socket, from remote servers and also to remote servers. Requires new API `syslogp()` to unlock these features on the UNIX socket. Still compatible with GLIBC/musl/uClibc - Support for options to `syslog.conf` rules. E.g. `;RFC5424` to enable sending/writing log messages with RFC3339 style timestamps, and more - Support for `include /etc/syslog.d/*.conf` in `syslog.conf` - New tool `logger` from the Finit project, BSD licensed. Supports all the features of RFC5424, so *very* useful for trying out the "new" standard - Support for reading from a custom UNIX domain socket path, `-p SOCK`, for unit testing with `logger -u /path/to/sock` - Support for sending to a custom port on a remote server, `@host:port` - New `syslogp()` API from NetBSD, for applications wanting to use RFC5424 features like MsgID or structured data - Many *incompatible changes* to command line options in `syslogd` and `klogd` for compatiblity with FreeBSD and NetBSD syslogd. Examples: - In syslogd: `-b` and `-c` have been replaced with `-r` for global log rotation, `-a` has been replaced with the new `-p` support. The `-r` flag and `-s HOST` has also been dropped in favor of the BSD `-s` flag to control two levels of _secure mode_. The `-n` flag is now `-F` and `-n` means something else entirely ... there's more - In klogd: `-i` and `-I` have been removed - `klogd` is not built by default anymore, `syslogd` can read `/proc/kmsg` on Linux on its own. Reduces complexity and gives you one daemon less - When systemd support is detected by the configure script the unit file(s) are now installed into the systemd system services folder - Update COPYING file to GPL 2 rev 2, with new FSF address and other minor stuff - Update license header in all files: - Sync 3-clause BSD license change with upstream NetBSD and FreeBSD sources - Sync GPL license header, new FSF address - Add SPDX license identifiers to all source files ### Fixes - Fix GCC 8 warnings; "too small destination buffer in `snprintf()`" - Major code cleanup and rewrite inspired by both NetBSD and FreeBSD sources, e.g. removed all previous unit `TESTING` #ifdefs [v1.6][] - 2018-09-25 --------------------- ### Changes - IPv6 support forward ported from FreeBSD, by John Haxby - Built-in log rotation support from BusyBox syslogd, disabled by default - Enable from command line using '-b SIZE' and '-c COUNT', or - Per log file in syslog.conf using 'SIZE:COUNT' - Automatic compression (gzip) of rotated files from .1 - Only read /etc/services when needed, by Martin Schulze - Improved sleep/alarm/mark implementation, by Alan Jenkins - Move hostname setting code from `main()` into `init()` so it is re-read on SIGHUP, by Thomas Jarosch - Documentation update by Martin Schulze - Re-indent code to Linux KNF - Touch PID file on `SIGHUP`, for integration with Finit - Add systemd unit files - Add GNU configure & build system - Add configure flags to enable features and control behavior - Detect systemd PATHs ### Fixes - Flush log files independent of MARK, by Martin Schulze - Fix segfault, remove faulty `fclose()`, found by Andrea Morandi and Sean Young. Fixed by Martin Schulze - Correct continuation line problems on 64bit architecture, by David Couture - Bugfix against invalid PRI values (CVE-2014-3634), by mancha - Ignore backed up (low baud rate) console, and do not close it. Instead, continue writing when its unclogged - Increase socket receive buffer size (double), patch from FreeBSD [v1.5.1][] - 2014-10-06 ----------------------- ### Fixes - Bugfix against invalid PRI values (CVE-2014-3634), by mancha [v1.5][] - 2007-07-27 --------------------- - Dmitry V. Levin - Close file descriptor in FindSymbolFile() in ksym.c in order not to leak file descriptors. - Solar Designer - improve crunch_list() - Prevent potential buffer overflow in reading messages from the kernel log ringbuffer. - Ensure that "len" is not placed in a register, and that the endtty() signal handler is not installed too early which could cause a segmentation fault or worse. - Steve Grubb - fix memory calculation in crunch_list() - Martin Schulze - klogd will reconnect to the logger (mostly syslogd) after it went away - On heavily loaded system syslog will not spit out error messages anymore when recvfrom() results in EAGAIN - Makefile improvements - Local copy of module.h - Improved sysklogd.8 - Always log with syslogd's timezone and locale - Remove trailing newline when forwarding messages - Continue working properly if /etc/service is missing and ignore network activity - Continue writing to log files as soon as space becomes available again after a filled up disk - Removed test to detect control characters > 0x20 as this prevented characters encoded in UTF-8 to be properly passed through - Only resolve the local domain when accepting messages from remote - Properly accompany the MARK message with the facility - Improved daemonise routine in klogd to stabilise startup - klogd will not change the console log level anymore unless -c is given - Added back /usr/src/linux/System.map as fall-back location - Rewrote the module symbol parser to read from /proc/kallsyms - Notify the waiting parent process if the client dies so it doesn't wait the entire five minutes. - Complete rewrite of the oops kernel module for Linux 2.6 - Only read kernel symbols from /proc/kallsyms if no System.map has been read - Improved symbol lookup - Prevent named pipes from becoming the controlling tty - Jon Burgess - Moved the installation of the signal handler up a little bit so it guaranteed to be available when the child is forked, hence, fixing a race condition. This used to create problems with UML and fast machines. - Greg Trounson - Improved README.linux - Ulf Härnhammar - Boundary check for fscanf() in InitKsyms() and CheckMapVersion() - Colin Phipps - Don't block on the network socket in case of packet loss - Dirk Mueller - Don't crash when filesize limit is reached (e.g. without LFS) - Miquel van Smoorenburg - Fix spurious hanging syslogd in connection with futex and NPTL introduced in recent glibc versions and Linux 2.6 (Details: http://bugs.debian.org/301511) - Eric Tucker - Improved syslog.conf(5) manpage - Mike Frysinger - use socklen_t where appropriate - Kelledin - use newer query_module function rather than stepping through /dev/kmem. - Matthew Fischer - Remove special treatment of the percent sign in klogd [v1.4.1][] - 2001-03-11 ----------------------- - klogd will set the console log level only if `-c' is given on the commandline, not overwriting local settings in `/etc/sysctl.conf'. - Bugfix: klogd will use SOCK_DGRM as well, re-enables kernel logging - Bugfix: Don't make syslogd fail with broken `-a' - Bugfix: klogd will skip zero bytes and not enter a busy loop anymore - Thomas Roessler - Patch to prevent LogLine() from being invoked with a negative counter as an argument. [v1.4][] - 2000-09-19 --------------------- - Skip newline when reading in klog messages - Use lseek64() instead of llseek() which is deprecated these days - Close symbol file before returning with 0 when an error occurred while reading it. This will enable systems to umount that partition with no open file descriptor left over. - Solar Designer - printline() fixes - priority decoding fix - Daniel Jacobowitz - printchopped() fix - Keith Owens - Fixed bug that caused klogd to die if there is no sym_array available. - When symbols are expanded, print the line twice. Once with addresses converted to symbols, once with the raw text. Allows external programs such as ksymoops do their own processing on the original data. - Olaf Kirch - Remove Unix Domain Sockets and switch to Datagram Unix Sockets - Several bugfixes and improvements, please refer to the .c files [UNRELEASED]: https://github.com/troglobit/sysklogd/compare/v2.2.0...HEAD [v2.2.1]: https://github.com/troglobit/sysklogd/compare/v2.2.0...v2.2.1 [v2.2.0]: https://github.com/troglobit/sysklogd/compare/v2.1.2...v2.2.0 [v2.1.2]: https://github.com/troglobit/sysklogd/compare/v2.1.1...v2.1.2 [v2.1.1]: https://github.com/troglobit/sysklogd/compare/v2.1...v2.1.1 [v2.1]: https://github.com/troglobit/sysklogd/compare/v2.0.3...v2.1 [v2.0.3]: https://github.com/troglobit/sysklogd/compare/v2.0.2...v2.0.3 [v2.0.2]: https://github.com/troglobit/sysklogd/compare/v2.0.1...v2.0.2 [v2.0.1]: https://github.com/troglobit/sysklogd/compare/v2.0...v2.0.1 [v2.0]: https://github.com/troglobit/sysklogd/compare/v1.6...v2.0 [v1.6]: https://github.com/troglobit/sysklogd/compare/v1.5...v1.6 [v1.5.1]: https://github.com/troglobit/sysklogd/compare/v1.5...v1.5.1 [v1.5]: https://github.com/troglobit/sysklogd/compare/v1.4...v1.5 [v1.4]: https://github.com/troglobit/sysklogd/compare/v1.3...v1.4