[syslog-ng] syslog-ng-3.38.1

[Laszlo Varady (lvarady)]

3.38.1
<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#highlights>
Highlights
<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#sneak-peek-into-syslog-ng-v40>
Sneak peek into syslog-ng v4.0

syslog-ng v4.0 is right around the corner.

This release (v3.38.1) contains all major changes, however, they are currently all hidden behind a feature flag. To enable and try those features, you need to specify @version: 4.0 at the top of the configuration file.

You can find out more about the 4.0 changes and features here<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS-4.0.md>.

Read our practical introduction to typing at syslog-ng-future.blog<https://syslog-ng-future.blog/syslog-ng-4-progress-3-38-1-release/>.

<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#features>
Features

  *   grouping-by(): added inject-mode(aggregate-only)

This inject mode will drop individual messages that make up the correlation context (key() groups) and would only yield the aggregate messages (e.g. the results of the correlation). (#3998<https://github.com/syslog-ng/syslog-ng/pull/3998>)

  *   add-contextual-data(): add support for type propagation, e.g. set the type of name-value pairs as they are created/updated to the value returned by the template expression that we use to set the value.

The 3rd column in the CSV file (e.g. the template expression) now supports specifying a type-hint, in the format of "type-hint(template-expr)".

Example line in the CSV database:

selector-value,name-value-pair-to-be-created,list(foo,bar,baz) (#4051<https://github.com/syslog-ng/syslog-ng/pull/4051>)

  *   $(format-json): add --key-delimiter option to reconstruct JSON objects using an alternative structure separator, that was created using the key-delimiter() option of json-parser(). (#4093<https://github.com/syslog-ng/syslog-ng/pull/4093>)

  *   json-parser(): add key-delimiter() option to extract JSON structure members into name-value pairs, so that the names are flattened using the character specified, instead of dot.

Example: Input: {"foo":{"key":"value"}}

Using json-parser() without key-delimiter() this is extracted to:

  foo.key="value"


Using json-parser(key-delimiter("~")) this is extracted to:

  foo~key="value"


This feature is useful in case the JSON keys contain dots themselves, in those cases the syslog-ng representation is ambigious. (#4093<https://github.com/syslog-ng/syslog-ng/pull/4093>)

<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#bugfixes>
Bugfixes

  *   Fixed buffer handling of syslog and timestamp parsers

Multiple buffer out-of-bounds issues have been fixed, which could cause hangs, high CPU usage, or other undefined behavior. (#4110<https://github.com/syslog-ng/syslog-ng/pull/4110>)

  *   Fixed building with LibreSSL (#4081<https://github.com/syslog-ng/syslog-ng/pull/4081>)

  *   network(): Fixed a bug, where syslog-ng halted the input instead of skipping a character in case of a character conversion error. (#4084<https://github.com/syslog-ng/syslog-ng/pull/4084>)

  *   redis(): Fixed bug where using redis driver without the batch-lines option caused program crash. (#4114<https://github.com/syslog-ng/syslog-ng/pull/4114>)

  *   pdbtool: fix a SIGABRT on FreeBSD that was triggered right before pdbtool exits. Apart from being an ugly crash that produces a core file, functionally the tool behaved correctly and this case does not affect syslog-ng itself. (#4037<https://github.com/syslog-ng/syslog-ng/pull/4037>)

  *   regexp-parser(): due to a change introduced in 3.37, named capture groups are stored indirectly in the LogMessage to avoid copying of the value. In this case the name-value pair created with the regexp is only stored as a reference (name + length of the original value), which improves performance and makes such name-value pairs use less memory. One omission in the original change in 3.37 is that syslog-ng does not allow builtin values to be stored indirectly (e.g. $MESSAGE and a few of others) and this case causes an assertion to fail and syslog-ng to crash with a SIGABRT. This abort is now fixed. Here's a sample config that reproduces the issue:

regexp-parser(patterns('(?<MESSAGE>.*)'));


(#4043<https://github.com/syslog-ng/syslog-ng/pull/4043>)

  *   set-tag: fix cloning issue when string literal were used (see #4062) (#4065<https://github.com/syslog-ng/syslog-ng/pull/4065>)

  *   add-contextual-data(): fix high memory usage when using large CSV files (#4067<https://github.com/syslog-ng/syslog-ng/pull/4067>)

<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#other-changes>
Other changes

  *   The json-c library is no longer bundled in the syslog-ng source tarball

Since all known OS package managers provide json-c packages nowadays, the json-c submodule has been removed from the source tarball.

The --with-jsonc=internal option of the configure script has been removed accordingly, system libraries will be used instead. For special cases, the JSON support can be disabled by specifying --with-jsonc=no. (#4078<https://github.com/syslog-ng/syslog-ng/pull/4078>)

  *   platforms: Dropped support for ubuntu-impish as it became EOL (#4088<https://github.com/syslog-ng/syslog-ng/pull/4088>)

<https://github.com/syslog-ng/syslog-ng/blob/master/NEWS.md#credits>
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:

Alvin Šipraga, Andras Mitzki, Attila Szakacs, Balazs Scheidler, Bálint Horváth, Daniel Klauer, Fabrice Fontaine, Gabor Nagy, HenryTheSir, László Várady, Parrag Szilárd, Peter Kokai, Shikhar Vashistha, Szilárd Parrag, Vivin Peris

Installation from binaries: https://github.com/syslog-ng/syslog-ng#installation-from-binaries<https://github.com/syslog-ng/syslog-ng#installation-from-binaries<https://github.com/syslog-ng/syslog-ng#installation-from-binaries>
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