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At my site we use the patterndb to match nearly every log message we get. We have over 9,000 patterns.</div>
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In some cases, such as the logs from iptables, there are many variations of the log line. Some are simply a different order of kv pairs, while others have one extra kv pair.</div>
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In other cases, there is a prefix text message followed by a json object. The json object may have a different order or different items.</div>
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There are other cases as well and they are all awkward to deal with.</div>
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What I already have working is using the patterndb to parse out a section of the log message into a json_data macro. Since this has been done with the patterndb I can arbitrarily set a few other things. I set a tag of parse_json</div>
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In the syslog-ng configuration it looks something like this:</div>
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parser p_json {</div>
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json-parser(</div>
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prefix(".json.")</div>
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template("$json_data)</div>
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# and within the log area</div>
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parser(pattern_db_patterns);</div>
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If ( filter( f_parse_json ) ) {</div>
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parser(p_json)</div>
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};</div>
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This results in all of the json structure to be available for other syslog-ng logic/controls/routing and forwarding to a SIEM or log visualization framework.</div>
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This works well because the json parser is always parsing json data. No controls are needed to assist with the parsing.</div>
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When I look at the kv parser (and other parsers), the kv data comes in many different formats. Different pair separators and different value separators.</div>
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What I would like to do is use the patterndb to parse a message to extract a kv pairs section into a kv_data macro. Sine the patterndb is specific to the one type of message, it is also known at that time which pair-separator and the value-separator values
should be used to parse the kv pairs. I would like to set kv_vsep an a kv_psep macros in the patterndb for this message.</div>
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Then my syslog-ng configuration would look something like:</div>
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parser p_kv {</div>
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kv-parser(</div>
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prefix(".kv.")</div>
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template("$kv_data")</div>
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pair-separator("$kv_psep:- ")</div>
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value-separator("$kv_vsep:-=")</div>
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};</div>
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# and in the log area</div>
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if ( filter(f_parse_kv) ) {</div>
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parser(p_kv);</div>
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};</div>
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This would allow the patternd to identify any type of kv_pair data AND pass the needed parsing details through to the kv_parser.</div>
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Without the ability to pass these value to the kv_parser I have to pre-determine all of the combinations of pair-separator and value-separator and make uniquely named kv parsers for each combination. Then I would need to pass from the patterndb a parser name
rather than the parser options. Finally I would have to have a section of</div>
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if ( filter(f_parse_kv_name1 ) {</div>
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parser(p_kv_name1);<br>
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Fore EVERY combination of pair-separator and value-separator. It can be done, but the configs need to be updated for a change it data, which just seems poor and it requires more if evaluations at runtime for each message.</div>
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Along with this, if both the pair-separator AND the value-separator are specified, this git issue should be addressed as well</div>
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<a href="https://github.com/syslog-ng/syslog-ng/issues/3953" id="LPlnk">https://github.com/syslog-ng/syslog-ng/issues/3953</a></div>
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Thanks for listening.</div>
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P.S. Further use case for those interested</div>
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We actually assign two additional macros in the patterndb is some cases.</div>
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<div>Tag of re_match</div>
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<div>Value of re_match_message</div>
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The re_match_message is any combination of static text and macros parsed from the original message. The intent is to be able to apply our patterndb to a value from one of the parsers (json, kv, cvs, column)</div>
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Our parsing is 4 phase</div>
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<div>patterndb parse the original message pulling out the json data to parse. The re_match_message is incorrectly populated at this time since the json values are not yet parsed</div>
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<div>Json parse the parsed json object from 1 (json_data) - or any other specialized parser.</div>
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<div>patterndb with the same message as #1 just for the purpose of correctly populating the re_match_message</div>
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<div>patterndb with the same PROGRAM but using re_match_message rather than MESSAGE</div>
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That final parsing will detect the real symantics of the log message based on data from within the json, kv-pair data. Is it a failure, success, login or logout. Does it warrent an incident to alert someone.<br>
Real CEE nomenclature can be assinged to the meaning of the message. Lots of other detailed goodness specific to a message within the json, kv-pair, csv, column parsed data.</div>
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I know. I might need a faster server 🙂</div>
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Evan</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> syslog-ng <syslog-ng-bounces@lists.balabit.hu> on behalf of Balazs Scheidler <bazsi77@gmail.com><br>
<b>Sent:</b> November 2, 2024 4:17 AM<br>
<b>To:</b> Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> Re: [syslog-ng] can kv-parser options be from macros</span>
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<div class="elementToProof" style="direction: ltr;"> Not at the moment. But if you can explain what you'd like to accomplish I can help. Is it LEEF maybe?</div>
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<div style="direction: ltr;">Balázs </div>
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<div style="direction: ltr;">On Fri, Nov 1, 2024, 18:02 Evan Rempel <<a href="mailto:erempel@uvic.ca" id="OWA7ed7cb39-7d20-a430-86d6-16867c72c08c" class="OWAAutoLink">erempel@uvic.ca</a>> wrote:</div>
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Does anyone know if I can use the enriching data to set macros that can then be used as kv-parser options.</div>
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These values might change on a message by message basis.</div>
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For example:</div>
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parser p_kv {</div>
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kv-parser (</div>
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prefix("$kv_prefix")<br>
value-separator("$kv_vseparator")</div>
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pair-separator("$kv_pseparator")</div>
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);</div>
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};</div>
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<span style="background-color: rgb(255, 255, 255);">--</span></div>
<div style="font-family: "Courier New", monospace; font-size: 14.6667px; color: rgb(153, 153, 153);">
<span style="background-color: rgb(255, 255, 255);">Evan</span></div>
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