Question about searching in packet headers

[Fedor Niskov via Snort-sigs <snort-sigs () lists snort org>]

Hello, excuse me, I have a question about Snort rules: can I do search in packet headers? I know about the 'content' option, 
but it performs searching only in payload; however, I'd like to check presence of some byte sequences in headers.

It would be useful to search in headers; for instance, I need to check some TCP options, but Snort non-payload rule options 
don't support it; if I could search for specific bytes in TCP header, I would be able to perform these checks.

(Fedor Niskov)

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