extracting packet bytes to file

[Andy Howell <andy () gamubaru com>]

I have an undocumented protocol I'm trying to understand. I'd like to extract a range of
bytes from from a number of packets to a file so that I can further analyze the data
outside wireshark.

Is there a way I tell wireshark to write out bytes that match a display filter?

Or how about calling some python code to do what I want?

Are there other tool help reverse engineer unknown protocols?

Thanks,

        Andy
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