forked from osmocom/wireshark
c4e374785e
Give it an RCS ID. svn path=/trunk/; revision=15912
143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/* packet-h221_nonstd.c
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* Routines for H.221 nonstandard parameters disassembly
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmodule.h>
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#include <ctype.h>
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#include <time.h>
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#include <string.h>
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#include <epan/packet.h>
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#include <epan/addr_resolv.h>
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#include <epan/prefs.h>
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#include <epan/strutil.h>
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#include <epan/dissectors/packet-per.h>
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/* Define the nonstd proto */
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static int proto_nonstd = -1;
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/*
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* Define the trees for nonstd
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* We need one for nonstd itself and one for the nonstd paramters
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*/
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static int ett_nonstd = -1;
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const value_string ms_codec_vals[] = {
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{ 0x0111, "L&H CELP 4.8k" },
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{ 0x0200, "MS-ADPCM" },
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{ 0x0211, "L&H CELP 8k" },
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{ 0x0311, "L&H CELP 12k" },
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{ 0x0411, "L&H CELP 16k" },
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{ 0x1100, "IMA-ADPCM" },
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{ 0x3100, "MS-GSM" },
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{ 0xfeff, "E-AMR" },
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{ 0, NULL }
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};
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static void
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dissect_ms_nonstd(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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proto_item *it;
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proto_tree *tr;
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guint32 offset=0;
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gint tvb_len;
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guint16 codec_value, codec_extra;
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it=proto_tree_add_protocol_format(tree, proto_nonstd, tvb, 0, tvb_length(tvb), "Microsoft NonStd");
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tr=proto_item_add_subtree(it, ett_nonstd);
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tvb_len = tvb_length(tvb);
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/*
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* XXX - why do this test? Are there any cases where throwing
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* an exception if the tvbuff is too short causes subsequent stuff
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* in the packet not to be dissected (e.g., if the octet string
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* containing the non-standard data is too short for the data
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* supposedly contained in it, and is followed by more items)?
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*
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* If so, the right fix might be to catch ReportedBoundsError in
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* the dissector calling this dissector, and report a malformed
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* nonStandardData item, and rethrow other exceptions (as a
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* BoundsError means you really *have* run out of packet data).
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*/
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if(tvb_len >= 23)
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{
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codec_value = tvb_get_ntohs(tvb,offset+20);
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codec_extra = tvb_get_ntohs(tvb,offset+22);
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if(codec_extra == 0x0100)
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{
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proto_tree_add_text(tree, tvb, offset+20,2, "Microsoft NetMeeting Codec=0x%04X %s",
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codec_value,val_to_str(codec_value, ms_codec_vals,"Unknown (%u)"));
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}
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else
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{
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proto_tree_add_text(tree, tvb, offset,-1, "Microsoft NetMeeting Non Standard");
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}
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}
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}
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/* Register all the bits needed with the filtering engine */
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void
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proto_register_nonstd(void)
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{
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static gint *ett[] = {
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&ett_nonstd,
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};
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proto_nonstd = proto_register_protocol("H221NonStandard","h221nonstd", "h221nonstd");
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proto_register_subtree_array(ett, array_length(ett));
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}
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/* The registration hand-off routine */
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void
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proto_reg_handoff_nonstd(void)
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{
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static dissector_handle_t ms_nonstd_handle;
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ms_nonstd_handle = create_dissector_handle(dissect_ms_nonstd, proto_nonstd);
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dissector_add("h245.nsp.h221",0xb500534c, ms_nonstd_handle);
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dissector_add("h225.nsp.h221",0xb500534c, ms_nonstd_handle);
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}
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