Snort mailing list archives

Re: Content matching question


From: "Joel Esler (jesler)" <jesler () cisco com>
Date: Mon, 20 Jan 2014 18:03:43 +0000

On Jan 20, 2014, at 12:58 PM, James Lay <jlay () slave-tothe-box net<mailto:jlay () slave-tothe-box net>> wrote:


So....I'm trying to figure out how to really NOT match certain content,
but match if the data size is longer then expected.  Example:

I have a packet where the usual data size is say 20 bytes and contains
the word "bleh".  I know I can content:!"bleh" and away I go.  But say
that packet is 30 bytes?  That I'd like to see, regardless if it has the
content "bleh" or not.

What are my options?  Byte_test?  It's not http, so any options with
that were out.  Thanks for any guidance.

Does the field have a terminating string?  Like |0d 0a| or something?

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