![Guy Harris](/assets/img/avatar_default.png)
- added a pointer to raw rtp data to _rtp_info that can be used by taps; - RTP packets are passed to the tap queue only if they are not error packets (so that you don't need to filter out ICMP packets) - use that pointer in rtp_stream, so it handles packets with padding, and should handle RTP packets fragmented across lower-level packets - moved rtp_stream from tap sources to normal files (prevents on-start-up registration of the rtp_stream tap listener) - rtp_stream tap gets registered/unregistered with the "RTP Streams" dialog box i.e. the tap is registered as long as the dialog box is open. Alternatively, it is de-/registered on demand if RTP Analysis is called directly on a packet. - rtp_stream tap listener no longer uses a filter in dissection ` and does not need to have a proto tree being built. (performance increase) - fixed: RTP Streams list will get updated in real time if the dialog box is open while a redissection takes place. svn path=/trunk/; revision=9051
788 lines
19 KiB
C
788 lines
19 KiB
C
/* packet-rtp.c
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*
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* Routines for RTP dissection
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* RTP = Real time Transport Protocol
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*
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* Copyright 2000, Philips Electronics N.V.
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* Written by Andreas Sikkema <andreas.sikkema@philips.com>
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*
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* $Id: packet-rtp.c,v 1.43 2003/11/20 23:34:29 guy Exp $
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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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/*
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* This dissector tries to dissect the RTP protocol according to Annex A
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* of ITU-T Recommendation H.225.0 (02/98) or RFC 1889
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*
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* RTP traffic is handled by an even UDP portnumber. This can be any
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* port number, but there is a registered port available, port 5004
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* See Annex B of ITU-T Recommendation H.225.0, section B.7
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*
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* This doesn't dissect older versions of RTP, such as:
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*
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* the vat protocol ("version 0") - see
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*
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* ftp://ftp.ee.lbl.gov/conferencing/vat/alpha-test/vatsrc-4.0b2.tar.gz
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*
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* and look in "session-vat.cc" if you want to write a dissector
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* (have fun - there aren't any nice header files showing the packet
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* format);
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*
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* version 1, as documented in
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*
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* ftp://gaia.cs.umass.edu/pub/hgschulz/rtp/draft-ietf-avt-rtp-04.txt
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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 <glib.h>
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#include <epan/packet.h>
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#include <stdio.h>
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#include <string.h>
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#include "packet-rtp.h"
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#include "rtp_pt.h"
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#include <epan/conversation.h>
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#include "tap.h"
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static int rtp_tap = -1;
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static dissector_table_t rtp_pt_dissector_table;
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/* RTP header fields */
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static int proto_rtp = -1;
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static int hf_rtp_version = -1;
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static int hf_rtp_padding = -1;
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static int hf_rtp_extension = -1;
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static int hf_rtp_csrc_count = -1;
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static int hf_rtp_marker = -1;
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static int hf_rtp_payload_type = -1;
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static int hf_rtp_seq_nr = -1;
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static int hf_rtp_timestamp = -1;
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static int hf_rtp_ssrc = -1;
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static int hf_rtp_csrc_item = -1;
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static int hf_rtp_data = -1;
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static int hf_rtp_padding_data = -1;
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static int hf_rtp_padding_count= -1;
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/* RTP header extension fields */
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static int hf_rtp_prof_define = -1;
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static int hf_rtp_length = -1;
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static int hf_rtp_hdr_ext = -1;
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/* RTP fields defining a sub tree */
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static gint ett_rtp = -1;
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static gint ett_csrc_list = -1;
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static gint ett_hdr_ext = -1;
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static dissector_handle_t data_handle;
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static gboolean dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree );
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static void dissect_rtp( tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree );
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/*
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* Fields in the first octet of the RTP header.
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*/
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/* Version is the first 2 bits of the first octet*/
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#define RTP_VERSION(octet) ((octet) >> 6)
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/* Padding is the third bit; No need to shift, because true is any value
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other than 0! */
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#define RTP_PADDING(octet) ((octet) & 0x20)
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/* Extension bit is the fourth bit */
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#define RTP_EXTENSION(octet) ((octet) & 0x10)
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/* CSRC count is the last four bits */
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#define RTP_CSRC_COUNT(octet) ((octet) & 0xF)
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static const value_string rtp_version_vals[] =
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{
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{ 0, "Old VAT Version" },
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{ 1, "First Draft Version" },
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{ 2, "RFC 1889 Version" },
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{ 0, NULL },
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};
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/*
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* Fields in the second octet of the RTP header.
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*/
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/* Marker is the first bit of the second octet */
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#define RTP_MARKER(octet) ((octet) & 0x80)
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/* Payload type is the last 7 bits */
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#define RTP_PAYLOAD_TYPE(octet) ((octet) & 0x7F)
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static const value_string rtp_payload_type_vals[] =
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{
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{ PT_PCMU, "ITU-T G.711 PCMU" },
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{ PT_1016, "USA Federal Standard FS-1016" },
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{ PT_G721, "ITU-T G.721" },
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{ PT_GSM, "GSM 06.10" },
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{ PT_G723, "ITU-T G.723" },
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{ PT_DVI4_8000, "DVI4 8000 samples/s" },
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{ PT_DVI4_16000, "DVI4 16000 samples/s" },
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{ PT_LPC, "Experimental linear predictive encoding from Xerox PARC" },
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{ PT_PCMA, "ITU-T G.711 PCMA" },
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{ PT_G722, "ITU-T G.722" },
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{ PT_L16_STEREO, "16-bit uncompressed audio, stereo" },
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{ PT_L16_MONO, "16-bit uncompressed audio, monaural" },
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{ PT_QCELP, "Qualcomm Code Excited Linear Predictive coding" },
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{ PT_CN, "Comfort noise" },
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{ PT_MPA, "MPEG-I/II Audio"},
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{ PT_G728, "ITU-T G.728" },
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{ PT_DVI4_11025, "DVI4 11025 samples/s" },
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{ PT_DVI4_22050, "DVI4 22050 samples/s" },
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{ PT_G729, "ITU-T G.729" },
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{ PT_CELB, "Sun CellB video encoding" },
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{ PT_JPEG, "JPEG-compressed video" },
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{ PT_NV, "'nv' program" },
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{ PT_H261, "ITU-T H.261" },
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{ PT_MPV, "MPEG-I/II Video"},
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{ PT_MP2T, "MPEG-II transport streams"},
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{ PT_H263, "ITU-T H.263" },
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{ 0, NULL },
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};
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static address fake_addr;
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static int heur_init = FALSE;
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void rtp_add_address( packet_info *pinfo, const unsigned char* ip_addr,
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int prt )
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{
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address src_addr;
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conversation_t* pconv;
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/*
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* If this isn't the first time this packet has been processed,
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* we've already done this work, so we don't need to do it
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* again.
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*/
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if (pinfo->fd->flags.visited)
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return;
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src_addr.type = AT_IPv4;
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src_addr.len = 4;
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src_addr.data = ip_addr;
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/*
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* The first time the function is called let the tcp dissector
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* know that we're interested in traffic
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*/
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if ( ! heur_init ) {
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heur_dissector_add( "udp", dissect_rtp_heur, proto_rtp );
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heur_init = TRUE;
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}
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/*
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* Check if the ip address an dport combination is not
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* already registered
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*/
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pconv = find_conversation( &src_addr, &fake_addr, PT_UDP, prt, 0, 0 );
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/*
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* If not, add
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* XXX - use wildcard address and port B?
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*/
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if ( ! pconv ) {
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pconv = conversation_new( &src_addr, &fake_addr, PT_UDP,
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(guint32) prt, (guint32) 0, 0 );
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conversation_add_proto_data(pconv, proto_rtp, NULL);
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}
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}
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#if 0
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static void rtp_init( void )
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{
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unsigned char* tmp_data;
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int i;
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/* Create a fake adddress... */
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fake_addr.type = AT_IPv4;
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fake_addr.len = 4;
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tmp_data = malloc( fake_addr.len );
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for ( i = 0; i < fake_addr.len; i++) {
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tmp_data[i] = 0;
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}
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fake_addr.data = tmp_data;
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}
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#endif
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static gboolean
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dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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{
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conversation_t* pconv;
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/* This is a heuristic dissector, which means we get all the TCP
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* traffic not sent to a known dissector and not claimed by
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* a heuristic dissector called before us!
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* So we first check if the frame is really meant for us.
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*/
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if ( ( pconv = find_conversation( &pinfo->src, &fake_addr, pinfo->ptype,
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pinfo->srcport, 0, 0 ) ) == NULL ) {
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/*
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* The source ip:port combination was not what we were
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* looking for, check the destination
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*/
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if ( ( pconv = find_conversation( &pinfo->dst, &fake_addr,
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pinfo->ptype, pinfo->destport, 0, 0 ) ) == NULL ) {
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return FALSE;
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}
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}
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/*
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* An RTP conversation always has a data item for RTP.
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* (Its existence is sufficient to indicate that this is an RTP
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* conversation.)
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*/
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if (conversation_get_proto_data(pconv, proto_rtp) == NULL)
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return FALSE;
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dissect_rtp( tvb, pinfo, tree );
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return TRUE;
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}
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static void
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dissect_rtp_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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proto_tree *rtp_tree, int offset, unsigned int data_len,
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unsigned int data_reported_len, unsigned int payload_type )
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{
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tvbuff_t *newtvb;
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newtvb = tvb_new_subset( tvb, offset, data_len, data_reported_len );
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if (!dissector_try_port(rtp_pt_dissector_table, payload_type, newtvb,
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pinfo, tree))
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proto_tree_add_item( rtp_tree, hf_rtp_data, newtvb, 0, -1, FALSE );
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}
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static void
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dissect_rtp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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{
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proto_item *ti = NULL;
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proto_tree *rtp_tree = NULL;
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proto_tree *rtp_csrc_tree = NULL;
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guint8 octet1, octet2;
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unsigned int version;
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gboolean padding_set;
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gboolean extension_set;
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unsigned int csrc_count;
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gboolean marker_set;
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unsigned int payload_type;
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unsigned int i = 0;
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unsigned int hdr_extension= 0;
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unsigned int padding_count;
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int data_len;
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unsigned int offset = 0;
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guint16 seq_num;
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guint32 timestamp;
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guint32 sync_src;
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guint32 csrc_item;
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static struct _rtp_info rtp_info;
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/* Get the fields in the first octet */
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octet1 = tvb_get_guint8( tvb, offset );
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version = RTP_VERSION( octet1 );
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if (version != 2) {
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/*
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* Unknown or unsupported version.
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*/
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if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP" );
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}
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if ( check_col( pinfo->cinfo, COL_INFO) ) {
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col_add_fstr( pinfo->cinfo, COL_INFO,
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"Unknown RTP version %u", version);
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}
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if ( tree ) {
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ti = proto_tree_add_item( tree, proto_rtp, tvb, offset, -1, FALSE );
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rtp_tree = proto_item_add_subtree( ti, ett_rtp );
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proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
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offset, 1, octet1);
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}
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return;
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}
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padding_set = RTP_PADDING( octet1 );
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extension_set = RTP_EXTENSION( octet1 );
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csrc_count = RTP_CSRC_COUNT( octet1 );
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/* Get the fields in the second octet */
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octet2 = tvb_get_guint8( tvb, offset + 1 );
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marker_set = RTP_MARKER( octet2 );
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payload_type = RTP_PAYLOAD_TYPE( octet2 );
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/* Get the subsequent fields */
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seq_num = tvb_get_ntohs( tvb, offset + 2 );
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timestamp = tvb_get_ntohl( tvb, offset + 4 );
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sync_src = tvb_get_ntohl( tvb, offset + 8 );
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/* fill in the rtp_info structure */
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rtp_info.info_padding_set = padding_set;
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rtp_info.info_padding_count = 0;
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rtp_info.info_marker_set = marker_set;
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rtp_info.info_payload_type = payload_type;
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rtp_info.info_seq_num = seq_num;
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rtp_info.info_timestamp = timestamp;
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rtp_info.info_sync_src = sync_src;
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rtp_info.info_data_len = tvb_reported_length_remaining( tvb, offset );
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/*
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* Save the pointer to raw rtp data (header + payload incl. padding)
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* That should be safe because the "epan_dissect_t" constructed for the packet
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* has not yet been freed when the taps are called.
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* (destroying the "epan_dissect_t" will end up freeing all the tvbuffs
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* and hence invalidating pointers to their data).
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* See "add_packet_to_packet_list()" for details.
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*/
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rtp_info.info_data = tvb_get_ptr(tvb, 0, -1);
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if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP" );
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}
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if ( check_col( pinfo->cinfo, COL_INFO) ) {
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col_add_fstr( pinfo->cinfo, COL_INFO,
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"Payload type=%s, SSRC=%u, Seq=%u, Time=%u%s",
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val_to_str( payload_type, rtp_payload_type_vals,
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"Unknown (%u)" ),
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sync_src,
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seq_num,
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timestamp,
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marker_set ? ", Mark" : "");
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}
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if ( tree ) {
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ti = proto_tree_add_item( tree, proto_rtp, tvb, offset, -1, FALSE );
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rtp_tree = proto_item_add_subtree( ti, ett_rtp );
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proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
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offset, 1, octet1 );
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proto_tree_add_boolean( rtp_tree, hf_rtp_padding, tvb,
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offset, 1, octet1 );
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proto_tree_add_boolean( rtp_tree, hf_rtp_extension, tvb,
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offset, 1, octet1 );
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proto_tree_add_uint( rtp_tree, hf_rtp_csrc_count, tvb,
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offset, 1, octet1 );
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offset++;
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proto_tree_add_boolean( rtp_tree, hf_rtp_marker, tvb, offset,
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1, octet2 );
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proto_tree_add_uint( rtp_tree, hf_rtp_payload_type, tvb,
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offset, 1, octet2 );
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offset++;
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/* Sequence number 16 bits (2 octets) */
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proto_tree_add_uint( rtp_tree, hf_rtp_seq_nr, tvb, offset, 2, seq_num );
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offset += 2;
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/* Timestamp 32 bits (4 octets) */
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proto_tree_add_uint( rtp_tree, hf_rtp_timestamp, tvb, offset, 4, timestamp );
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offset += 4;
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/* Synchronization source identifier 32 bits (4 octets) */
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proto_tree_add_uint( rtp_tree, hf_rtp_ssrc, tvb, offset, 4, sync_src );
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offset += 4;
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} else {
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offset += 12;
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}
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/* CSRC list*/
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if ( csrc_count > 0 ) {
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if ( tree ) {
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ti = proto_tree_add_text(rtp_tree, tvb, offset, csrc_count * 4, "Contributing Source identifiers");
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rtp_csrc_tree = proto_item_add_subtree( ti, ett_csrc_list );
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}
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for (i = 0; i < csrc_count; i++ ) {
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csrc_item = tvb_get_ntohl( tvb, offset );
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if ( tree ) proto_tree_add_uint_format( rtp_csrc_tree,
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hf_rtp_csrc_item, tvb, offset, 4,
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csrc_item,
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"CSRC item %d: %u",
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i, csrc_item );
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offset += 4;
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}
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}
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/* Optional RTP header extension */
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if ( extension_set ) {
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/* Defined by profile field is 16 bits (2 octets) */
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if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_prof_define, tvb, offset, 2, tvb_get_ntohs( tvb, offset ) );
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offset += 2;
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hdr_extension = tvb_get_ntohs( tvb, offset );
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if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_length, tvb,
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offset, 2, hdr_extension);
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offset += 2;
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if ( hdr_extension > 0 ) {
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if ( tree ) { ti = proto_tree_add_text(rtp_tree, tvb, offset, csrc_count * 4, "Header extensions");
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/* I'm re-using the old tree variable here
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from the CSRC list!*/
|
|
rtp_csrc_tree = proto_item_add_subtree( ti,
|
|
ett_hdr_ext );
|
|
}
|
|
for (i = 0; i < hdr_extension; i++ ) {
|
|
if ( tree ) proto_tree_add_uint( rtp_csrc_tree, hf_rtp_hdr_ext, tvb, offset, 4, tvb_get_ntohl( tvb, offset ) );
|
|
offset += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( padding_set ) {
|
|
/*
|
|
* This RTP frame has padding - find it.
|
|
*
|
|
* The padding count is found in the LAST octet of
|
|
* the packet; it contains the number of octets
|
|
* that can be ignored at the end of the packet.
|
|
*/
|
|
if (tvb_length(tvb) < tvb_reported_length(tvb)) {
|
|
/*
|
|
* We don't *have* the last octet of the
|
|
* packet, so we can't get the padding
|
|
* count.
|
|
*
|
|
* Put an indication of that into the
|
|
* tree, and just put in a raw data
|
|
* item.
|
|
*/
|
|
if ( tree ) proto_tree_add_text(rtp_tree, tvb, 0, 0,
|
|
"Frame has padding, but not all the frame data was captured");
|
|
call_dissector(data_handle,
|
|
tvb_new_subset(tvb, offset, -1, -1),
|
|
pinfo, rtp_tree);
|
|
return;
|
|
}
|
|
|
|
padding_count = tvb_get_guint8( tvb,
|
|
tvb_reported_length( tvb ) - 1 );
|
|
data_len =
|
|
tvb_reported_length_remaining( tvb, offset ) - padding_count;
|
|
|
|
rtp_info.info_payload_offset = offset;
|
|
rtp_info.info_payload_len = tvb_length_remaining(tvb, offset);
|
|
rtp_info.info_padding_count = padding_count;
|
|
|
|
if (data_len > 0) {
|
|
/*
|
|
* There's data left over when you take out
|
|
* the padding; dissect it.
|
|
*/
|
|
dissect_rtp_data( tvb, pinfo, tree, rtp_tree,
|
|
offset,
|
|
data_len,
|
|
data_len,
|
|
payload_type );
|
|
offset += data_len;
|
|
} else if (data_len < 0) {
|
|
/*
|
|
* The padding count is bigger than the
|
|
* amount of RTP payload in the packet!
|
|
* Clip the padding count.
|
|
*
|
|
* XXX - put an item in the tree to indicate
|
|
* that the padding count is bogus?
|
|
*/
|
|
padding_count =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
}
|
|
if (padding_count > 1) {
|
|
/*
|
|
* There's more than one byte of padding;
|
|
* show all but the last byte as padding
|
|
* data.
|
|
*/
|
|
if ( tree ) proto_tree_add_item( rtp_tree, hf_rtp_padding_data,
|
|
tvb, offset, padding_count - 1, FALSE );
|
|
offset += padding_count - 1;
|
|
}
|
|
/*
|
|
* Show the last byte in the PDU as the padding
|
|
* count.
|
|
*/
|
|
if ( tree ) proto_tree_add_item( rtp_tree, hf_rtp_padding_count,
|
|
tvb, offset, 1, FALSE );
|
|
}
|
|
else {
|
|
/*
|
|
* No padding.
|
|
*/
|
|
dissect_rtp_data( tvb, pinfo, tree, rtp_tree, offset,
|
|
tvb_length_remaining( tvb, offset ),
|
|
tvb_reported_length_remaining( tvb, offset ),
|
|
payload_type );
|
|
rtp_info.info_payload_offset = offset;
|
|
rtp_info.info_payload_len = tvb_length_remaining(tvb, offset);
|
|
}
|
|
if (!pinfo->in_error_pkt)
|
|
tap_queue_packet(rtp_tap, pinfo, &rtp_info);
|
|
}
|
|
|
|
void
|
|
proto_register_rtp(void)
|
|
{
|
|
static hf_register_info hf[] =
|
|
{
|
|
{
|
|
&hf_rtp_version,
|
|
{
|
|
"Version",
|
|
"rtp.version",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
VALS(rtp_version_vals),
|
|
0xC0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_padding,
|
|
{
|
|
"Padding",
|
|
"rtp.padding",
|
|
FT_BOOLEAN,
|
|
8,
|
|
NULL,
|
|
0x20,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_extension,
|
|
{
|
|
"Extension",
|
|
"rtp.ext",
|
|
FT_BOOLEAN,
|
|
8,
|
|
NULL,
|
|
0x10,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_csrc_count,
|
|
{
|
|
"Contributing source identifiers count",
|
|
"rtp.cc",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0F,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_marker,
|
|
{
|
|
"Marker",
|
|
"rtp.marker",
|
|
FT_BOOLEAN,
|
|
8,
|
|
NULL,
|
|
0x80,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_payload_type,
|
|
{
|
|
"Payload type",
|
|
"rtp.p_type",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
VALS(rtp_payload_type_vals),
|
|
0x7F,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_seq_nr,
|
|
{
|
|
"Sequence number",
|
|
"rtp.seq",
|
|
FT_UINT16,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_timestamp,
|
|
{
|
|
"Timestamp",
|
|
"rtp.timestamp",
|
|
FT_UINT32,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_ssrc,
|
|
{
|
|
"Synchronization Source identifier",
|
|
"rtp.ssrc",
|
|
FT_UINT32,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_prof_define,
|
|
{
|
|
"Defined by profile",
|
|
"rtp.ext.profile",
|
|
FT_UINT16,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_length,
|
|
{
|
|
"Extension length",
|
|
"rtp.ext.len",
|
|
FT_UINT16,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_csrc_item,
|
|
{
|
|
"CSRC item",
|
|
"rtp.csrc.item",
|
|
FT_UINT32,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_hdr_ext,
|
|
{
|
|
"Header extension",
|
|
"rtp.hdr_ext",
|
|
FT_UINT32,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_data,
|
|
{
|
|
"Payload",
|
|
"rtp.payload",
|
|
FT_BYTES,
|
|
BASE_HEX,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_padding_data,
|
|
{
|
|
"Padding data",
|
|
"rtp.padding.data",
|
|
FT_BYTES,
|
|
BASE_HEX,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_padding_count,
|
|
{
|
|
"Padding count",
|
|
"rtp.padding.count",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
static gint *ett[] =
|
|
{
|
|
&ett_rtp,
|
|
&ett_csrc_list,
|
|
&ett_hdr_ext,
|
|
};
|
|
|
|
|
|
proto_rtp = proto_register_protocol("Real-Time Transport Protocol",
|
|
"RTP", "rtp");
|
|
proto_register_field_array(proto_rtp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("rtp", dissect_rtp, proto_rtp);
|
|
rtp_tap = register_tap("rtp");
|
|
|
|
rtp_pt_dissector_table = register_dissector_table("rtp.pt",
|
|
"RTP payload type", FT_UINT8, BASE_DEC);
|
|
|
|
#if 0
|
|
register_init_routine( &rtp_init );
|
|
#endif
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_rtp(void)
|
|
{
|
|
dissector_handle_t rtp_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
/*
|
|
* Register this dissector as one that can be selected by a
|
|
* UDP port number.
|
|
*/
|
|
rtp_handle = find_dissector("rtp");
|
|
dissector_add_handle("udp.port", rtp_handle);
|
|
}
|