Wireshark-dev: Re: [Wireshark-dev] p2p_dir
From: "Luis EG Ontanon" <[email protected]>
Date: Fri, 10 Aug 2007 14:51:31 +0200
Richard,
Once that you are at it why don't you move it to epan/dissectors and
remove the plugin.


On 8/6/07, Richard van der Hoff <[email protected]> wrote:
> Hi all,
>
> I'm looking at extending the H.223 dissector to work over ISDN. (ftr,
> H.223 is a circuit-based protocol which is supposed to work over the
> telephone network; currently wireshark will dissect it over IAX2, TCP or
> RTP, and I want to extend it to the one place it really really _ought_
> to work...)
>
> The isdn dissector currently sets pinfo->ctype = CT_ISDN, and
> pinfo->circuit_id to the ISDN channel number; however, it provides no
> means to distinguish the two directions on that channel, which the H.223
> dissector needs in order to perform conversation tracking.
>
> One option would be to special-case for pinfo->ctype==CT_ISDN in the
> H.223 dissector, and then check pinfo->pseudo_header->isdn.uton for the
> direction bit - but that seems unnecessarily specific to ISDN.
>
> It seems better to use pinfo->p2p_dir for this. I just wanted to check
> that this was the intended use of this field before modifying the isdn
> dissector. (It's also not entirely obvious how the user/network
> semantics of isdn should map onto the sent/received semantics of
> p2p_dir; however, I don't think that actually matters a great deal).
>
> Thanks,
>
> Richard
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>


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