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Network Security Snort-Signatures
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Re: [Snort-sigs] Strange PCRE usage in standard snort rules

Subject: Re: [Snort-sigs] Strange PCRE usage in standard snort rules
Date: Sun, 08 May 2005 21:18:18 -0500
On Mon, 2005-05-09 at 11:59 +1000, Erik de Castro Lopo wrote:
I've noticed some strange usage of PCRE in the netbios.rules. For 
instance, rule 2937 has the following construct:

    pcre:"/^.{27}/R";
    content:"&|00|"; distance:29; within:2;

Err.... I was under the impression that distance and within only work on
a previous "content" match, and not "pcre" matches. Are you saying
distance can be used to offset from previous "pcre" matches? Can /R in
pcre then also be used to offset from previous "content" matches?

Curious,
Frank

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