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