Re: Snort and pcre error

[Brian <bmc () snort org>]

On Thu, Mar 25, 2004 at 09:51:32AM -0800, James Nonya wrote:
> Mar 25 10:53:36 gateway snort: FATAL ERROR:
> /etc/snort/rules/gateway.rules (62): 
> unknown/extra pcre option encountered

Most of the regular expressions that NII provided have "issues" or are flat out broken.

For example, the RE "/((\%3C)|<)[^\n]+((\%3E)|>)/I" is broken because
the "I" is a pcretest specific option that dumps a bit of debugging
info after parsing the RE.

> pcre:"/((\%3C)|<)((\%2F)|\/)*[a-z0-9\%]+((\%3E)|>)/i";

This RE does parse properly, but I would not recommend using it.
These are VERY painful, performance wise.

Brian


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