[syslog-ng] syslog-ng-3.26.1

Laszlo Budai laszlo.budai at outlook.com
Thu Mar 5 11:11:09 UTC 2020


  *   file source: Added a new option to multi-line file sources: multi-line-timeout()
After waiting multi-line-timeout() seconds without reading new data from the file, the last (potentially partial)
message will be flushed and sent through the pipeline as a LogMessage.
Since the multi-line file source detects the end of a message after finding the beginning of the subsequent message
(indented or no-garbage/suffix mode), this option can be used to flush the last multi-line message
in the file after a multi-line-timeout()-second timeout.
There is no default value, i.e. this timeout needs to be explicitly configured.
Example config:

    multi-line-prefix('^EVENT: ')


  *   python-http-header: Added this new plugin, which makes it possible for users to implement HTTP header plugins in Python language.
It is built on top of signal-slot mechanism: currently HTTP module defines only one signal, that is signal_http_header_request and python-http-header plugin implements a python binding for this signal. This means that when the signal_http_header_request signal is emitted then the connected slot executes the Python code.
The Python interface is:

def get_headers(self, body, headers):

It should return string List. The headers that will be appended to the request's header.
When the plugin fails, http module won't try to send the http request without the header items by default.
If you want http module to trying to send the request without these headers, just disable mark-errors-as-critical() function.
Original code was written by Ferenc Sipos.

Example config, click to expand! (#3123<https://github.com/syslog-ng/syslog-ng/pull/3123>)
  *   azure-auth-header: Added this new plugin, which generates authorization header for applications connecting to Azure.
It can be used as a building block in higher level SCLs.
Implemented as a signal-slot plugin.

Example config, click to expand! (#3078<https://github.com/syslog-ng/syslog-ng/pull/3078>)
  *   python: From now on users can specify a persist name template from python code.

def generate_persist_name(options):
    return options["file_name"]

     *   Usage of this function is necessary, when one python destination is used multiple times in one config.
     *   Persist name from config takes precedence over generate_persist_name.
     *   Persist name is exposed through self.persist_name. (#3016<https://github.com/syslog-ng/syslog-ng/pull/3016>)


  *   set-severity(): Added this new rewrite rule for changing message severity.
It receives a template and sets message severity by evaluating the template.
Numerical and textual severity levels are both supported.

rewrite {

  *   $(list-search): Added a new template function, which returns the first index of a pattern in a list.
Starts the search at start_index. 0 based. If not found, returns empty string.
Usage: $(list-search --mode MODE <pattern> ${list})
Where mode can be: literal (default), prefix, substring, glob, pcre.
Add --start-index <index> to change the start index. (#2955<https://github.com/syslog-ng/syslog-ng/pull/2955>)
  *   config version: Made the config version check of the configuration more liberal by accepting version numbers
that had no changes relative to the current version. This means that if you are running 3.26 and the last
semantic change in the configuration was 3.22, then anything between 3.22 and 3.26 (inclusive) is accepted
by syslog-ng without a warning at startup. (#3074<https://github.com/syslog-ng/syslog-ng/pull/3074>)
  *   $SEVERITY instead of $LEVEL: syslog-ng now follows the RFC3164 trend of using severity instead of level
to refer to the severity of the message that is used in the template language ($SEVERITY),
filter expressions (severity()) and so on. (#3128<https://github.com/syslog-ng/syslog-ng/pull/3128>)
  *   http: Added ssl_version("tlsv1_3") and ssl_version("no-tlsv13") options to respectively force and disable TLSv1.3. (#3063<https://github.com/syslog-ng/syslog-ng/pull/3063>)
  *   scl: Improved error message at init, when an scl is missing a dependency. (#3015<https://github.com/syslog-ng/syslog-ng/pull/3015>)
  *   geoip2: Added template() option as an alias for the positional argument string, to match the grammar convention. (#3051<https://github.com/syslog-ng/syslog-ng/pull/3051>)
  *   loggly: Added transport() option, so users can now use it with tls (or any network() supported transport). (#3149<https://github.com/syslog-ng/syslog-ng/pull/3149>)
  *   config-option-database: Added support for parser, diskq and hook-commands blocks. (#3029<https://github.com/syslog-ng/syslog-ng/pull/3029>)


  *   configure.ac: Fixed gethostbyname() function location detection (#3135<https://github.com/syslog-ng/syslog-ng/pull/3135>)

  *   http: Fixed a crash, when workers() was set to 0. We do not allow nonnegative values anymore. (#3116<https://github.com/syslog-ng/syslog-ng/pull/3116>)

  *   snmp-dest: engine-id() option now handles 5 to 32 characters, instead of the strict 10 before. (#3058<https://github.com/syslog-ng/syslog-ng/pull/3058>)

  *   http: Fixed handling of ssl-version() option, which was ignored before.
Prior this fix, these values of ssl-version in http destination were ignored by syslog-ng:
tlsv1_0, tlsv1_1, tlsv1_2, tlsv1_3. (#3083<https://github.com/syslog-ng/syslog-ng/pull/3083>)

  *   network sources: Added workaround for a TLS 1.3 bug to prevent data loss.
Due to a bug in the OpenSSL TLS 1.3 implementation (openssl/openssl#10880<https://github.com/openssl/openssl/issues/10880>),
it is possible to lose messages when one-way communication protocols are used, -
such as the syslog protocol over TLS (RFC 5425<https://tools.ietf.org/html/rfc5425>,
RFC 6587<https://tools.ietf.org/html/rfc6587>) - and the connection is closed by the client right after sending data.
The bug is in the TLS 1.3 session ticket handling logic of OpenSSL.

To prevent such data loss, we've disabled TLS 1.3 session tickets in all syslog-ng network sources.
Tickets are used for session resumption, which is currently not supported by syslog-ng.

The loggen testing tool also received some bugfixes (#3064<https://github.com/syslog-ng/syslog-ng/pull/3064>), which reduce the
likelihood of data loss if the target of loggen has not turned off session tickets.

If you're sending logs to third-party OpenSSL-based TLS 1.3 collectors, we recommend turning session
tickets off in those applications as well until the OpenSSL bug is fixed. (#3082<https://github.com/syslog-ng/syslog-ng/pull/3082>)

  *   cmake: Now we install loggen headers, as we do with autotools. (#3067<https://github.com/syslog-ng/syslog-ng/pull/3067>)

  *   graylog2, format-gelf: Fixed sending empty message, when ${PID} is not set.
Also added a default value "-" to empty short_message and host as they are mandatory fields. (#3112<https://github.com/syslog-ng/syslog-ng/pull/3112>)

  *   loggen: fix dependency error with cmake + openssl from nonstandard location (#3062<https://github.com/syslog-ng/syslog-ng/pull/3062>)

  *   config-option-database: Fixed reading 'grammar' and 'parser' files on 'POSIX' environment (#3125<https://github.com/syslog-ng/syslog-ng/pull/3125>)

  *   file source: Fixed file source not able to process new message after log-msg-size() increase. (#3075<https://github.com/syslog-ng/syslog-ng/pull/3075>)

  *   checkpoint parser: Fixed parsing ISO timestamp. (#3056<https://github.com/syslog-ng/syslog-ng/pull/3056>)

  *   secret-storage: Fixed some cases, where diagnostical logs were truncated. (#3141<https://github.com/syslog-ng/syslog-ng/pull/3141>)

  *   loggen, dqtool: Fixed a crash, when writing error/debug message or relocating qfile. (#3069<https://github.com/syslog-ng/syslog-ng/pull/3069>)

  *   build: Fixed a compatibility related build error on Solaris 11. (#3070<https://github.com/syslog-ng/syslog-ng/pull/3070>)

  *   loggen: Fixed address resolution when only loopback interface was configured. (#3048<https://github.com/syslog-ng/syslog-ng/pull/3048>)


  *   scl: Moved scl files to the core package. (#2979<https://github.com/syslog-ng/syslog-ng/pull/2979>)
  *   RHEL: Now we include the packaging/rhel/ folder in our release tarball. (#3071<https://github.com/syslog-ng/syslog-ng/pull/3071>)
  *   RHEL 8 / CentOS 8: Added RHEL 8 / CentOS 8 support to syslog-ng.spec (#3034<https://github.com/syslog-ng/syslog-ng/pull/3034>)

Notes to developers

  *   signal-slot-connector: Introduced a generic event handler interface for syslog-ng modules.

     *   The concept is simple:
        *   There is a SignalSlotConnector which stores Signal - Slot connections
        *   Signal : Slot = 1 : N, so multiple slots can be assigned to the same Signal.
        *   When a Signal is emitted, the connected Slots are executed.
        *   Signals are string literals and each module can define its own signals.
     *   Interface/protocol between signals and slots:
        *   A macro (SIGNAL) can be used for defining signals as string literals:

SIGNAL(module_name, signal, signal_parameter_type)

The parameter type is for expressing a kind of contract between signals and slots.

     *   Usage:

   #define signal_cfg_reloaded SIGNAL(config, reloaded, GlobalConfig)
   the generated literal:
   "config::signal_reloaded(GlobalConfig *)"

     *   emit passes the argument to the slots connected to the emitted signal. (#3043<https://github.com/syslog-ng/syslog-ng/pull/3043>)
  *   http: Defined the Signal interface for HTTP - with one signal at this time.
What's in the changeset?

     *   List ADT (abstract data type for list implementations) added to lib.
        *   Interface:
           *   append
           *   foreach
           *   is_empty
           *   remove_all
     *   Implemented the List ADT in http module with struct curl_slist for storing the headers.
     *   HTTP signal(s):
        *   Currently only one signal is added, header_request.
Note, that the license for http-signals.h is LGPL . (#3044<https://github.com/syslog-ng/syslog-ng/pull/3044>)
  *   example-modules: Added example http slot plugin.
This plugin is an example plugin that implements a slot for a HTTP signal (signal_http_header_request).
When the plugin is attached, it CONNECT itself to the signal.
When the signal is emitted by the http module, the slot is executed and append the header to the http headers.
header is set in the config file.

Example config, click to expand! (#3093<https://github.com/syslog-ng/syslog-ng/pull/3093>)
  *   NEWS.md: From now on, for every PR that we want to include in the newsfile,
we must create the news entry with the PR itself. See news/README.md. (#3066<https://github.com/syslog-ng/syslog-ng/pull/3066>)

  *   snmp test in Light: Added snmp destination tests in the Light test framework.
These tests requires snmptrapd as an external dependency. If you don't want to run this test,
you can use the pytest's marker discovery feature: python -m pytest ... -m 'not snmp'
The tests are run by syslog-ng's Travis workflow. (#3126<https://github.com/syslog-ng/syslog-ng/pull/3126>)

  *   cmake: Added add_module function to cmake to normalize CMakeLists.txt files for modules. (#3106<https://github.com/syslog-ng/syslog-ng/pull/3106>)

  *   dbld: Introduced syslog-ng-kira as a new CI image (#3125<https://github.com/syslog-ng/syslog-ng/pull/3125>)

  *   FunctionalTests: Functional tests are now Python3 compatible (#3144<https://github.com/syslog-ng/syslog-ng/pull/3144>)

  *   dbld: Added Ubuntu 19.10 and 20.04 (#3091<https://github.com/syslog-ng/syslog-ng/pull/3091>)

  *   dbld: Added option to customize shell command.
With this change, it is possible to override the option with rules.conf, while keeping the default behaviour.
The simplest example: use existing images, start a new one if there is none. (use docker rm manually if you want to update)

DOCKER_SHELL=$(DOCKER) inspect $* > /dev/null 2>&1; \
  if [ $$? -eq 0 ]; then \
    $(DOCKER) start -ia $*; \
  else \
    $(DOCKER) run $(DOCKER_RUN_ARGS) -ti --name $* balabit/syslog-ng-$* /source/dbld/shell; \


Other changes

  *   python: Added --with-python3-home configure option to use a hard-coded PYTHONHOME for Python-based plugins.
This can be useful when a Python interpreter is bundled with syslog-ng.
Relocation is supported, for example: --with-python3-home='${exec_prefix}' (#3134<https://github.com/syslog-ng/syslog-ng/pull/3134>)
  *   afmongodb: Removed the support of deprecated legacy configurations (#3092<https://github.com/syslog-ng/syslog-ng/pull/3092>)
  *   http: use-system-cert-store() now autodetects the system provided cert-store (#3086<https://github.com/syslog-ng/syslog-ng/pull/3086>)
  *   doc: Added manual page for persist-tool. (#3072<https://github.com/syslog-ng/syslog-ng/pull/3072>)


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:

Andras Mitzki, Antal Nemes, Attila Szakacs, Balazs Scheidler, Dylan Perry, Gabor Nagy, Laszlo Budai,
Laszlo Szemere, László Várady, Norbert Takacs, Peter Czanik, Péter Kókai, Romain Tartière, Tomáš Mózes.

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