Wireshark-dev: Re: [Wireshark-dev] Heuristic dissector for "wtap_encap"
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From: "Shaun Jackman" <sjackman@xxxxxxxxx>
Date: Sat, 23 Dec 2006 21:07:40 -0700
On 12/23/06, Shaun Jackman <sjackman@xxxxxxxxx> wrote:

Is it possible to register a heuristic dissector for a particular
"wtap_encap" type?


I came up with a solution. I registered one normal dissector against
the specific "wtap_encap" type and all the other dissectors become
heuristic dissectors against that first protocol.

Cheers,
Shaun

/* somewhat abbreviated... */

static heur_dissector_list_t heur_subdissector_list;

void
dissect_mpeg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
   dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree);
}

void
proto_register_mpeg(void)
{
	proto_mpeg = proto_register_protocol(
			"Moving Picture Experts Group", "MPEG", "mpeg");
	register_heur_dissector_list("mpeg", &heur_subdissector_list);
}

void
proto_reg_handoff_mpeg(void)
{
	dissector_handle_t mpeg_handle = create_dissector_handle(
			dissect_mpeg, proto_mpeg);
	dissector_add("wtap_encap", WTAP_ENCAP_MPEG, mpeg_handle);
	heur_dissector_add("mpeg", dissect_mpeg_pes, proto_mpeg_pes);
	heur_dissector_add("mpeg", dissect_mpeg_audio, proto_mpeg_audio);
}