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

[Scheidler, Balázs]

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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