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3.9.1

Features

  • Improve parsing performance in case of keep-timestamp(no), earlier the timestamp was parsed and then dropped, now we don't parse it, which is a 2x performance improvement in reception speed.

  • TLS based transports will publish the peer's certificate in a set of name-value pairs, as follows:

    • .tls.x509_cn - X.509 common name
    • .tls.x509_o - X.509 organization string
    • .tls.x509_ou - X.509 organizational unit

  • Improve performance of the tcp() source, due to a bug, syslog-ng attempted to apply position tracking to messages coming over a TCP transport, which is used for file position tracking and causing performance degradation. This bug is fixed, causing performance to be increased. (#1195)

  • Make it possible to configure the listen-backlog() for any stream based transports (unix-stream and tcp). Earlier this was hard-wired at 256 connections, now can be tuned using an option. For example:

    tcp(port(6514) listen-backlog(2048));

  • Add a groupunset() rewrite rule that pairs up with groupset() but instead of setting values it unsets them. (#1235)

  • Add support for Elastic Shield (#1228) and SearchGuard (#1223)

  • kv-parser() is now able to cope with unquoted values with an embedded space in them, it also trims whitespace from keys/values and is in general more reliable in extracting key-value pairs from arbitrary log messages.

  • Improve performance for java based destinations. (#1243)

  • Add prefix() option to add-contextual-data()

Bugfixes

  • Fix a potential crash in the file destination, in case it is a template based filename and time-reap() is elapsed. (#1183)

  • Fix a potential ACK problem within syslog-ng that can cause input windows to overflow queue sizes over time, effectively causing message drops that shouldn't occur. (#1230)

  • Fix a heap corruption bug in the DNS cache, in case the maximum number of DNS cache entries is reached. (#1218)

  • Fix timestamp for suppression messages. (#1233)

  • Fix add-contextual-data() to support CRLF line endings in its CSV input files.

  • Fixed key() option parsing in riemann() destinations.

  • Find libsystemd-journal related functions in both libsystemd-journal.so and libsystemd.so, as recent systemd versions bundled all systemd related libs into the same library.

  • Fixed the build-time detection of system-wide installed librabbitmq, libmongoc and libcap.

  • Fix the file source to repeatedly check for unexisting files, as a bug caused syslog-ng to stop after two attempts previously. (#841)

  • The performance testing tool "loggen" crashed if it was used to generate messages on multiple threads over TLS. This was now fixed. (#1182)

  • Fix an issue in the syslog-parser() parser, so that timestamps parsed earlier in the log path are properly overwritten. Earlier a time-zone setting may have remained in the timestamp in case the first timestamp did contain a timezone and then the one parsed by syslog-parser() didn't. (#1206)

  • Due to a compilation issue, tcp-keepalive-time(), tcp-keepalive-intvl() and tcp-keepalive-probes() were not working, now they are again. (#1214)

  • The --disable-shm-counters option is now passed to mongo-c-driver to work around a minor security issue (#1219).

    https://jira.mongodb.org/plugins/servlet/mobile#issue/CDRIVER-1691/comment/1405406

  • Fix compilation issues on FreeBSD. (#1252)

  • Add support to month names in all caps in syslog timestamps. At least one device seems to generate these. (#1263)

  • The options() option to java destination can now accept numbers and not just strings.

  • Fix a memory leak in the java destination driver, that may affect java based destinations like ElasticSearch, Kafka & HDFS.

Other changes

  • HDFS was updated to 2.7.3

  • Elasticsearch was updated to 2.4.0

  • Support was added for OpenSSL 1.1.x (#1281)

#Notes to the Developers

  • We started to standardize our tests on the criterion unit testing framework, please submit all new tests using this framework. Patches to convert existing ones are also welcome. https://github.com/Snaipe/Criterion

  • We also added a configuration file for astyle and accompanying make targets to check/reformat the source code to meet syslog-ng's style.

  • debian/ directory has been removed from the "master" branch and is now maintained in a separate "release" branch.

#Credits

syslog-ng is developed as a community project, and as such it relies on volunteers, to do the work necessarily to produce syslog-ng.

Reporting bugs, testing changes, writing code or simply providing feedback are all important contributions, so please if you are a user of syslog-ng, contribute.

We would like to thank the following people for their contribution:

Lászlo Várady, 0xddaa, Balázs Scheidler, Tamás Nagy, László Budai, Fabien Wernli, Viktor Juhász, Kyle Manna, Michael Wimpy, Noémi Ványi, Attila Szalay, Tibor Bodnár, Zoltán Pallagi