Ethereal-dev: Re: [Ethereal-dev] Need help with protocol that spans multiple TVBs

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Tue, 13 Apr 2004 10:40:13 -0700
On Tue, Apr 13, 2004 at 07:23:50AM +0000, Sid Sid wrote:
> I mean should we have some registration function inside ACSE dissector which 
> will be called by FTAM/CMIP/MMS and so on  dissectors ?

No.

The ACSE dissector would do something such as

	application_context_dissector_table = register_dissector_table(
	    "acse.application_context", "Application context OID",
	    FT_STRING, BASE_NONE);

and the FTAM, CMIP, MMS, etc. dissectors would do something such as

	ftam_handle = create_dissector_handle(dissect_ftam, proto_ftam);
	dissector_add_string("acse.application_context", "1.0.8571.1.1",
	    ftam_handle);

(and would no longer register their dissectors by name), and, when
handling the application context OID, the ACSE dissector would do
something such as

	app_handle = dissector_get_string_handle(
	    application_context_dissector_table, oid_string);
	if (app_handle != NULL)
		app_name = dissector_handle_get_short_name(app_handle);
	else
		app_name = NULL;

and "call_app_dissector()" would directly use "app_name" (and report
that it's unknown if null) rather than using "type_of_application".