diff options
author | Guy Harris <guy@alum.mit.edu> | 2000-11-15 07:07:52 +0000 |
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committer | Guy Harris <guy@alum.mit.edu> | 2000-11-15 07:07:52 +0000 |
commit | 77ad89b12ddbec16981b495c60c895d463850c8f (patch) | |
tree | b2bb48ca0cc103556fb5908f6cc9ea9a9f278581 /packet-sdp.c | |
parent | 7c3fcbac34993a39ed0f3ed753bfd72a5bcf3c5a (diff) |
Add a mechanism by which a dissector can be registered by name, another
dissector can get a "handle" for that dissector by name and then call
that dissector through the handle.
This allows dissectors that can't be called through a port table or a
heuristic table to be called from other dissectors without directly
referring to the dissector function - dynamically-loaded modules, under
Windows, cannot directly call functions in the main program, and
non-plugin dissectors are in the main program and thus cannot be called
from plugin dissectors unless either
1) a pointer to the dissector is put in the Big Transfer Vector
or
2) some other mechanism for getting a pointer to the dissector
is provided.
This mechanism could also support registering old-style dissectors and
calling them from new-style dissectors without the new-style dissector
having to do the argument translation itself (I didn't add support for
registering old-style dissectors because I'd prefer to have people
tvbuffify their code if they have to register a dissector...).
It could also, in the future, perhaps support
disabling of protocols;
setting "pinfo->current_proto";
inside "call_dissector()" - and inside "{old_}dissector_try_port()" and
"{old_"dissector_try_heuristic()" - allowing a pile of stuff that
currently has to be done in every dissector be done by common code.
(I have some ideas about how to do this, by
having "proto_register_protocol()" take an abbreviation - of the
sort that would be put in, for example, "pinfo->current_proto" -
as an argument;
having the calls to register dissectors take an index returned
by "proto_register_protocol()" as an argument.
The abbreviation could be used elsewhere as well, e.g. in the "Decoding"
tab of the "Edit->Protocols" dialog box, and in a GUI for constructing
protocol filters. Watch this space.)
Make "dissect_sdp()" the first client of this mechanism; it's now static
to "packet-sdp.c", and all dissectors that call it - including the MGCP
plugin - now call it through a dissector handle fetched by
"find_dissector()". (Next step - see if Ethereal can now compile on
Windows as a result of this.)
svn path=/trunk/; revision=2647
Diffstat (limited to 'packet-sdp.c')
-rw-r--r-- | packet-sdp.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/packet-sdp.c b/packet-sdp.c index 0dfc80b311..1c0a639547 100644 --- a/packet-sdp.c +++ b/packet-sdp.c @@ -4,7 +4,7 @@ * Jason Lango <jal@netapp.com> * Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu> * - * $Id: packet-sdp.c,v 1.15 2000/11/13 08:58:12 guy Exp $ + * $Id: packet-sdp.c,v 1.16 2000/11/15 07:07:44 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs <gerald@zing.org> @@ -45,7 +45,7 @@ static int proto_sdp = -1; static int ett_sdp = -1; -void +static void dissect_sdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *sdp_tree; @@ -218,4 +218,12 @@ proto_register_sdp(void) proto_sdp = proto_register_protocol("Session Description Protocol", "sdp"); /* proto_register_field_array(proto_sdp, hf, array_length(hf));*/ proto_register_subtree_array(ett, array_length(ett)); + + /* + * Register the dissector by name, so other dissectors can + * grab it by name rather than just referring to it directly + * (you can't refer to it directly from a plugin dissector + * on Windows without stuffing it into the Big Transfer Vector). + */ + register_dissector("sdp", dissect_sdp); } |