Ethereal-dev: Re: [Ethereal-dev] Dissector Question

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

Date Index Thread Index Other Months All Mailing Lists
Date Prev Date Next Thread Prev Thread Next
From: Guy Harris <guy@xxxxxxxxxx>
Date: Fri, 20 Jul 2001 16:25:49 -0700 (PDT)
> A few days ago, I submitted the PGM dissector.  Since PGM is a
> transport protocol, I wanted people to be able to dissect protocols that
> were layered on top of PGM.

I infer from the draft at

	http://search.ietf.org/internet-drafts/draft-speakman-pgm-spec-06.txt

that the protocol being used atop PGM is specified by the
Data-Destination port in a packet.

If so, then the right way to handle this is to do as TCP and UDP do with
their source and destination ports, and create a dissector table (with a
name like "pgm.destport") with "register_dissector_table()".  Then

	use "dissector_try_port()", in the PGM dissector, to try to hand
	off the payload to the next dissector;

	have dissectors for protocols that run atop PGM register
	themselves with that dissector table with "dissector_add()".