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Have a look at packet-rtp.c, which does a similar thing.
Check for heur_dissector_add( "udp", dissect_rtp_heur, proto_rtp);
On 06/22/2011 05:59 AM, cq x wrote:
> thank you
> on top of UDP
> yes, it is looking for a special value in the first byte of the packet
> Thanks again
> > From: firstname.lastname@example.org
> > Date: Tue, 21 Jun 2011 17:56:37 -0700
> > To: email@example.com
> > Subject: Re: [Wireshark-dev] ask about dissector_add ( ) function to instruct
> wireshark to pass packet to my dissector
> > On Jun 21, 2011, at 4:18 PM, Changqin Xia wrote:
> > > I am a newbie on dissector development. I have a question about the
> "dissector_add( )" function.
> > >
> > > I went through a few examples, most of them are using "tcp.port" or
> "udp.port" or something like that.
> > >
> > > My dissector not uses any port number to instruct wireshark to pass packets
> to my dissector, my dissector is using "Magic" (the first byte).
> > What protocol does your dissector's protocol run on top of? TCP, UDP, or
> something els e?
> > And when you say "my dissector is using "Magic" (the first byte)", do you
> mean it's looking for a special magic value in the first byte of its packet data?
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