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/* packet-h221_nonstd.c
* Routines for H.221 nonstandard parameters disassembly
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_nonstd(void);
void proto_reg_handoff_nonstd(void);
static dissector_handle_t ms_nonstd_handle;
/* Define the nonstd proto */
static int proto_nonstd;
static int hf_h221_nonstd_netmeeting_codec;
static int hf_h221_nonstd_netmeeting_non_standard;
/*
* Define the trees for nonstd
* We need one for nonstd itself and one for the nonstd paramters
*/
static int ett_nonstd;
static const value_string ms_codec_vals[] = {
{ 0x0111, "L&H CELP 4.8k" },
{ 0x0200, "MS-ADPCM" },
{ 0x0211, "L&H CELP 8k" },
{ 0x0311, "L&H CELP 12k" },
{ 0x0411, "L&H CELP 16k" },
{ 0x1100, "IMA-ADPCM" },
{ 0x3100, "MS-GSM" },
{ 0xfeff, "E-AMR" },
{ 0, NULL }
};
static int
dissect_ms_nonstd(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void* data _U_)
{
proto_item *it;
proto_tree *tr;
uint32_t offset=0;
int tvb_len;
uint16_t codec_extra;
it=proto_tree_add_protocol_format(tree, proto_nonstd, tvb, 0, tvb_reported_length(tvb), "Microsoft NonStd");
tr=proto_item_add_subtree(it, ett_nonstd);
tvb_len = tvb_reported_length(tvb);
/*
* XXX - why do this test? Are there any cases where throwing
* an exception if the tvbuff is too short causes subsequent stuff
* in the packet not to be dissected (e.g., if the octet string
* containing the non-standard data is too short for the data
* supposedly contained in it, and is followed by more items)?
*
* If so, the right fix might be to catch ReportedBoundsError in
* the dissector calling this dissector, and report a malformed
* nonStandardData item, and rethrow other exceptions (as a
* BoundsError means you really *have* run out of packet data).
*/
if(tvb_len >= 23)
{
codec_extra = tvb_get_ntohs(tvb,offset+22);
if(codec_extra == 0x0100)
{
proto_tree_add_item(tr, hf_h221_nonstd_netmeeting_codec, tvb, offset+20, 2, ENC_BIG_ENDIAN);
}
else
{
proto_tree_add_item(tr, hf_h221_nonstd_netmeeting_non_standard, tvb, offset, -1, ENC_NA);
}
}
return tvb_captured_length(tvb);
}
/* Register all the bits needed with the filtering engine */
void
proto_register_nonstd(void)
{
static hf_register_info hf[] = {
{ &hf_h221_nonstd_netmeeting_codec,
{ "Microsoft NetMeeting Codec", "h221nonstd.netmeeting.codec", FT_UINT32, BASE_HEX,
VALS(ms_codec_vals), 0, NULL, HFILL }
},
{ &hf_h221_nonstd_netmeeting_non_standard,
{ "Microsoft NetMeeting Non Standard", "h221nonstd.netmeeting.non_standard", FT_BYTES, BASE_NONE,
NULL, 0, NULL, HFILL }
},
};
static int *ett[] = {
&ett_nonstd,
};
proto_nonstd = proto_register_protocol("H221NonStandard","h221nonstd", "h221nonstd");
proto_register_subtree_array(ett, array_length(ett));
proto_register_field_array(proto_nonstd, hf, array_length(hf));
ms_nonstd_handle = register_dissector("h221nonstd", dissect_ms_nonstd, proto_nonstd);
}
/* The registration hand-off routine */
void
proto_reg_handoff_nonstd(void)
{
dissector_add_uint("h245.nsp.h221",0xb500534c, ms_nonstd_handle);
dissector_add_uint("h225.nsp.h221",0xb500534c, ms_nonstd_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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