[syslog-ng] Changing a value after a match with patterndb

[Scheidler, Balázs]

that might be the case for the port mapping, however I think it would be
nice to have map() as a rewrite operation, e.g. one that maps specific
values to others. And also, improving the conditional evaluation somehow
would be great.

Right now we have to do stuff like:

channel {
    log { filter(blabla); conditional processing here; flags(final); };
    log { filter(blabla2); conditional2 processing here; flags(final); };
    log { filter(blabla3); conditional3 processing here; flags(final); };

};

It would be _much_ nicer to have something like this:

channel {
    if (blabla) { conditional processing here;  };
    if (blabla2) { conditional2 processing here; };
    if (blabla3) { conditional3 processing here; };

};

We could perhaps add else as well.


-- 
Bazsi

On Tue, Jan 12, 2016 at 5:25 PM, Tibor Benke <ihrwein at gmail.com> wrote:

> AFAIK there is a getent() function in syslog-ng-incubator for the port ->
> protocol translation.
>
> 2016-01-12 17:15 GMT+01:00 Scheidler, Balázs <balazs.scheidler at balabit.com
> >:
>
>> I would suggest to do this mapping _after_ the db-parser() stuff, e.g. I
>> would use db-parser _only_ to extract name-value pairs and then do mappings
>> from syslog-ng configuration file:
>>
>> parser {
>>     channel {
>>        parser { db-parser(); };
>>        rewrite { set("telnet" value("LOCALPORT") condition("${LOCALPORT}"
>> == "23"))); };
>>        rewrite { set("ssh" value("LOCALPORT") condition("${LOCALPORT}" ==
>> "22"))); };
>>     };
>> };
>>
>> We would definitely need to improve the syntax in the rewrite portion
>> though, and I am willing to invest some efforts in that direction.
>>
>> My point really is that db-parser() should be used for extraction, the
>> rest of the syntax language for munging/mapping.
>>
>> --
>> Bazsi
>>
>> On Tue, Jan 12, 2016 at 4:47 PM, Fabien Wernli <wernli at in2p3.fr> wrote:
>>
>>> Hi Mark,
>>>
>>> You can use template functions in patterndb [1].
>>> The idea is to add a value to the matched message, which contains the
>>> result
>>> of a template function. You could for instance use the "if" function:
>>>
>>>     <values>
>>>       <value name="svc">$(if ("${port}" == "22") "ssh" "telnet")</value>
>>>     </values>
>>>
>>> If you need anything more complex, and if you are using the 3.7.x series,
>>> you could even use a python script using the "python" template function.
>>>
>>> Cheers
>>>
>>> [1]
>>> https://www.balabit.com/sites/default/files/documents/syslog-ng-ose-latest-guides/en/syslog-ng-ose-guide-admin/html-single/index.html#reference-template-functions
>>>
>>>
>>>
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>>>
>>>
>>>
>>
>>
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>>
>>
>>
>
>
> ______________________________________________________________________________
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