3d65182245
svn path=/trunk/; revision=7701
825 lines
20 KiB
C
825 lines
20 KiB
C
/* packet-rtp.c
|
|
*
|
|
* Routines for RTP dissection
|
|
* RTP = Real time Transport Protocol
|
|
*
|
|
* Copyright 2000, Philips Electronics N.V.
|
|
* Written by Andreas Sikkema <andreas.sikkema@philips.com>
|
|
*
|
|
* $Id: packet-rtp.c,v 1.39 2003/05/20 21:22:58 guy Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
* This dissector tries to dissect the RTP protocol according to Annex A
|
|
* of ITU-T Recommendation H.225.0 (02/98) or RFC 1889
|
|
*
|
|
* RTP traffic is handled by an even UDP portnumber. This can be any
|
|
* port number, but there is a registered port available, port 5004
|
|
* See Annex B of ITU-T Recommendation H.225.0, section B.7
|
|
*
|
|
* This doesn't dissect older versions of RTP, such as:
|
|
*
|
|
* the vat protocol ("version 0") - see
|
|
*
|
|
* ftp://ftp.ee.lbl.gov/conferencing/vat/alpha-test/vatsrc-4.0b2.tar.gz
|
|
*
|
|
* and look in "session-vat.cc" if you want to write a dissector
|
|
* (have fun - there aren't any nice header files showing the packet
|
|
* format);
|
|
*
|
|
* version 1, as documented in
|
|
*
|
|
* ftp://gaia.cs.umass.edu/pub/hgschulz/rtp/draft-ietf-avt-rtp-04.txt
|
|
*/
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "packet-rtp.h"
|
|
#include <epan/conversation.h>
|
|
#include "tap.h"
|
|
|
|
static int rtp_tap = -1;
|
|
|
|
/* RTP header fields */
|
|
static int proto_rtp = -1;
|
|
static int hf_rtp_version = -1;
|
|
static int hf_rtp_padding = -1;
|
|
static int hf_rtp_extension = -1;
|
|
static int hf_rtp_csrc_count = -1;
|
|
static int hf_rtp_marker = -1;
|
|
static int hf_rtp_payload_type = -1;
|
|
static int hf_rtp_seq_nr = -1;
|
|
static int hf_rtp_timestamp = -1;
|
|
static int hf_rtp_ssrc = -1;
|
|
static int hf_rtp_csrc_item = -1;
|
|
static int hf_rtp_data = -1;
|
|
static int hf_rtp_padding_data = -1;
|
|
static int hf_rtp_padding_count= -1;
|
|
|
|
/* RTP header extension fields */
|
|
static int hf_rtp_prof_define = -1;
|
|
static int hf_rtp_length = -1;
|
|
static int hf_rtp_hdr_ext = -1;
|
|
|
|
/* RTP fields defining a sub tree */
|
|
static gint ett_rtp = -1;
|
|
static gint ett_csrc_list = -1;
|
|
static gint ett_hdr_ext = -1;
|
|
|
|
static dissector_handle_t h261_handle;
|
|
static dissector_handle_t mpeg1_handle;
|
|
static dissector_handle_t data_handle;
|
|
|
|
static gboolean dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree );
|
|
static void dissect_rtp( tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree );
|
|
|
|
/*
|
|
* Fields in the first octet of the RTP header.
|
|
*/
|
|
|
|
/* Version is the first 2 bits of the first octet*/
|
|
#define RTP_VERSION(octet) ((octet) >> 6)
|
|
|
|
/* Padding is the third bit; No need to shift, because true is any value
|
|
other than 0! */
|
|
#define RTP_PADDING(octet) ((octet) & 0x20)
|
|
|
|
/* Extension bit is the fourth bit */
|
|
#define RTP_EXTENSION(octet) ((octet) & 0x10)
|
|
|
|
/* CSRC count is the last four bits */
|
|
#define RTP_CSRC_COUNT(octet) ((octet) & 0xF)
|
|
|
|
static const value_string rtp_version_vals[] =
|
|
{
|
|
{ 0, "Old VAT Version" },
|
|
{ 1, "First Draft Version" },
|
|
{ 2, "RFC 1889 Version" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
/*
|
|
* Fields in the second octet of the RTP header.
|
|
*/
|
|
|
|
/* Marker is the first bit of the second octet */
|
|
#define RTP_MARKER(octet) ((octet) & 0x80)
|
|
|
|
/* Payload type is the last 7 bits */
|
|
#define RTP_PAYLOAD_TYPE(octet) ((octet) & 0x7F)
|
|
|
|
/*
|
|
* RTP Payload types
|
|
* Table B.2 / H.225.0
|
|
* Also RFC 1890, and
|
|
*
|
|
* http://www.iana.org/assignments/rtp-parameters
|
|
*/
|
|
#define PT_PCMU 0 /* RFC 1890 */
|
|
#define PT_1016 1 /* RFC 1890 */
|
|
#define PT_G721 2 /* RFC 1890 */
|
|
#define PT_GSM 3 /* RFC 1890 */
|
|
#define PT_G723 4 /* From Vineet Kumar of Intel; see the Web page */
|
|
#define PT_DVI4_8000 5 /* RFC 1890 */
|
|
#define PT_DVI4_16000 6 /* RFC 1890 */
|
|
#define PT_LPC 7 /* RFC 1890 */
|
|
#define PT_PCMA 8 /* RFC 1890 */
|
|
#define PT_G722 9 /* RFC 1890 */
|
|
#define PT_L16_STEREO 10 /* RFC 1890 */
|
|
#define PT_L16_MONO 11 /* RFC 1890 */
|
|
#define PT_QCELP 12 /* Qualcomm Code Excited Linear Predictive coding? */
|
|
#define PT_CN 13 /* RFC 3389 */
|
|
#define PT_MPA 14 /* RFC 1890, RFC 2250 */
|
|
#define PT_G728 15 /* RFC 1890 */
|
|
#define PT_DVI4_11025 16 /* from Joseph Di Pol of Sun; see the Web page */
|
|
#define PT_DVI4_22050 17 /* from Joseph Di Pol of Sun; see the Web page */
|
|
#define PT_G729 18
|
|
#define PT_CELB 25 /* RFC 2029 */
|
|
#define PT_JPEG 26 /* RFC 2435 */
|
|
#define PT_NV 28 /* RFC 1890 */
|
|
#define PT_H261 31 /* RFC 2032 */
|
|
#define PT_MPV 32 /* RFC 2250 */
|
|
#define PT_MP2T 33 /* RFC 2250 */
|
|
#define PT_H263 34 /* from Chunrong Zhu of Intel; see the Web page */
|
|
|
|
static const value_string rtp_payload_type_vals[] =
|
|
{
|
|
{ PT_PCMU, "ITU-T G.711 PCMU" },
|
|
{ PT_1016, "USA Federal Standard FS-1016" },
|
|
{ PT_G721, "ITU-T G.721" },
|
|
{ PT_GSM, "GSM 06.10" },
|
|
{ PT_G723, "ITU-T G.723" },
|
|
{ PT_DVI4_8000, "DVI4 8000 samples/s" },
|
|
{ PT_DVI4_16000, "DVI4 16000 samples/s" },
|
|
{ PT_LPC, "Experimental linear predictive encoding from Xerox PARC" },
|
|
{ PT_PCMA, "ITU-T G.711 PCMA" },
|
|
{ PT_G722, "ITU-T G.722" },
|
|
{ PT_L16_STEREO, "16-bit uncompressed audio, stereo" },
|
|
{ PT_L16_MONO, "16-bit uncompressed audio, monaural" },
|
|
{ PT_QCELP, "Qualcomm Code Excited Linear Predictive coding" },
|
|
{ PT_CN, "Comfort noise" },
|
|
{ PT_MPA, "MPEG-I/II Audio"},
|
|
{ PT_G728, "ITU-T G.728" },
|
|
{ PT_DVI4_11025, "DVI4 11025 samples/s" },
|
|
{ PT_DVI4_22050, "DVI4 22050 samples/s" },
|
|
{ PT_G729, "ITU-T G.729" },
|
|
{ PT_CELB, "Sun CellB video encoding" },
|
|
{ PT_JPEG, "JPEG-compressed video" },
|
|
{ PT_NV, "'nv' program" },
|
|
{ PT_H261, "ITU-T H.261" },
|
|
{ PT_MPV, "MPEG-I/II Video"},
|
|
{ PT_MP2T, "MPEG-II transport streams"},
|
|
{ PT_H263, "ITU-T H.263" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static address fake_addr;
|
|
static int heur_init = FALSE;
|
|
|
|
void rtp_add_address( packet_info *pinfo, const unsigned char* ip_addr,
|
|
int prt )
|
|
{
|
|
address src_addr;
|
|
conversation_t* pconv;
|
|
|
|
/*
|
|
* If this isn't the first time this packet has been processed,
|
|
* we've already done this work, so we don't need to do it
|
|
* again.
|
|
*/
|
|
if (pinfo->fd->flags.visited)
|
|
return;
|
|
|
|
src_addr.type = AT_IPv4;
|
|
src_addr.len = 4;
|
|
src_addr.data = ip_addr;
|
|
|
|
/*
|
|
* The first time the function is called let the tcp dissector
|
|
* know that we're interested in traffic
|
|
*/
|
|
if ( ! heur_init ) {
|
|
heur_dissector_add( "udp", dissect_rtp_heur, proto_rtp );
|
|
heur_init = TRUE;
|
|
}
|
|
|
|
/*
|
|
* Check if the ip address an dport combination is not
|
|
* already registered
|
|
*/
|
|
pconv = find_conversation( &src_addr, &fake_addr, PT_UDP, prt, 0, 0 );
|
|
|
|
/*
|
|
* If not, add
|
|
* XXX - use wildcard address and port B?
|
|
*/
|
|
if ( ! pconv ) {
|
|
pconv = conversation_new( &src_addr, &fake_addr, PT_UDP,
|
|
(guint32) prt, (guint32) 0, 0 );
|
|
conversation_add_proto_data(pconv, proto_rtp, NULL);
|
|
}
|
|
|
|
}
|
|
|
|
#if 0
|
|
static void rtp_init( void )
|
|
{
|
|
unsigned char* tmp_data;
|
|
int i;
|
|
|
|
/* Create a fake adddress... */
|
|
fake_addr.type = AT_IPv4;
|
|
fake_addr.len = 4;
|
|
|
|
tmp_data = malloc( fake_addr.len );
|
|
for ( i = 0; i < fake_addr.len; i++) {
|
|
tmp_data[i] = 0;
|
|
}
|
|
fake_addr.data = tmp_data;
|
|
}
|
|
#endif
|
|
|
|
static gboolean
|
|
dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
|
|
{
|
|
conversation_t* pconv;
|
|
|
|
/* This is a heuristic dissector, which means we get all the TCP
|
|
* traffic not sent to a known dissector and not claimed by
|
|
* a heuristic dissector called before us!
|
|
* So we first check if the frame is really meant for us.
|
|
*/
|
|
if ( ( pconv = find_conversation( &pinfo->src, &fake_addr, pinfo->ptype,
|
|
pinfo->srcport, 0, 0 ) ) == NULL ) {
|
|
/*
|
|
* The source ip:port combination was not what we were
|
|
* looking for, check the destination
|
|
*/
|
|
if ( ( pconv = find_conversation( &pinfo->dst, &fake_addr,
|
|
pinfo->ptype, pinfo->destport, 0, 0 ) ) == NULL ) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* An RTP conversation always has a data item for RTP.
|
|
* (Its existence is sufficient to indicate that this is an RTP
|
|
* conversation.)
|
|
*/
|
|
if (conversation_get_proto_data(pconv, proto_rtp) == NULL)
|
|
return FALSE;
|
|
|
|
dissect_rtp( tvb, pinfo, tree );
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
dissect_rtp_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
proto_tree *rtp_tree, int offset, unsigned int data_len,
|
|
unsigned int data_reported_len, unsigned int payload_type )
|
|
{
|
|
tvbuff_t *newtvb;
|
|
|
|
switch( payload_type ) {
|
|
case PT_H261:
|
|
newtvb = tvb_new_subset( tvb, offset, data_len,
|
|
data_reported_len );
|
|
call_dissector(h261_handle, newtvb, pinfo, tree);
|
|
break;
|
|
|
|
case PT_MPV:
|
|
newtvb = tvb_new_subset( tvb, offset, data_len,
|
|
data_reported_len );
|
|
call_dissector(mpeg1_handle, newtvb, pinfo, tree);
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_item( rtp_tree, hf_rtp_data, tvb, offset, data_len, FALSE );
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_rtp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
|
|
{
|
|
proto_item *ti = NULL;
|
|
proto_tree *rtp_tree = NULL;
|
|
proto_tree *rtp_csrc_tree = NULL;
|
|
guint8 octet;
|
|
unsigned int version;
|
|
gboolean padding_set;
|
|
gboolean extension_set;
|
|
unsigned int csrc_count;
|
|
gboolean marker_set;
|
|
unsigned int payload_type;
|
|
unsigned int i = 0;
|
|
unsigned int hdr_extension= 0;
|
|
unsigned int padding_count;
|
|
int data_len;
|
|
unsigned int offset = 0;
|
|
guint16 seq_num;
|
|
guint32 timestamp;
|
|
guint32 sync_src;
|
|
guint32 csrc_item;
|
|
|
|
static struct _rtp_info rtp_info;
|
|
|
|
/* Get the fields in the first octet */
|
|
octet = tvb_get_guint8( tvb, offset );
|
|
version = RTP_VERSION( octet );
|
|
|
|
if (version != 2) {
|
|
/*
|
|
* Unknown or unsupported version.
|
|
*/
|
|
if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
|
|
col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP" );
|
|
}
|
|
|
|
if ( check_col( pinfo->cinfo, COL_INFO) ) {
|
|
col_add_fstr( pinfo->cinfo, COL_INFO,
|
|
"Unknown RTP version %u", version);
|
|
}
|
|
|
|
if ( tree ) {
|
|
ti = proto_tree_add_item( tree, proto_rtp, tvb, offset, -1, FALSE );
|
|
rtp_tree = proto_item_add_subtree( ti, ett_rtp );
|
|
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
|
|
offset, 1, version );
|
|
}
|
|
return;
|
|
}
|
|
|
|
padding_set = RTP_PADDING( octet );
|
|
extension_set = RTP_EXTENSION( octet );
|
|
csrc_count = RTP_CSRC_COUNT( octet );
|
|
|
|
/* Get the fields in the second octet */
|
|
octet = tvb_get_guint8( tvb, offset + 1 );
|
|
marker_set = RTP_MARKER( octet );
|
|
payload_type = RTP_PAYLOAD_TYPE( octet );
|
|
|
|
/* Get the subsequent fields */
|
|
seq_num = tvb_get_ntohs( tvb, offset + 2 );
|
|
timestamp = tvb_get_ntohl( tvb, offset + 4 );
|
|
sync_src = tvb_get_ntohl( tvb, offset + 8 );
|
|
|
|
/* fill in the rtp_info structure */
|
|
rtp_info.info_padding_set = padding_set;
|
|
rtp_info.info_padding_count = 0;
|
|
rtp_info.info_marker_set = marker_set;
|
|
rtp_info.info_payload_type = payload_type;
|
|
rtp_info.info_seq_num = seq_num;
|
|
rtp_info.info_timestamp = timestamp;
|
|
rtp_info.info_sync_src = sync_src;
|
|
rtp_info.info_data_len = tvb_reported_length_remaining( tvb, offset );
|
|
|
|
if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
|
|
col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP" );
|
|
}
|
|
|
|
if ( check_col( pinfo->cinfo, COL_INFO) ) {
|
|
col_add_fstr( pinfo->cinfo, COL_INFO,
|
|
"Payload type=%s, SSRC=%u, Seq=%u, Time=%u%s",
|
|
val_to_str( payload_type, rtp_payload_type_vals,
|
|
"Unknown (%u)" ),
|
|
sync_src,
|
|
seq_num,
|
|
timestamp,
|
|
marker_set ? ", Mark" : "");
|
|
}
|
|
if ( tree ) {
|
|
ti = proto_tree_add_item( tree, proto_rtp, tvb, offset, -1, FALSE );
|
|
rtp_tree = proto_item_add_subtree( ti, ett_rtp );
|
|
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
|
|
offset, 1, version );
|
|
proto_tree_add_boolean( rtp_tree, hf_rtp_padding, tvb,
|
|
offset, 1, padding_set );
|
|
proto_tree_add_boolean( rtp_tree, hf_rtp_extension, tvb,
|
|
offset, 1, extension_set );
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_csrc_count, tvb,
|
|
offset, 1, csrc_count );
|
|
offset++;
|
|
|
|
proto_tree_add_boolean( rtp_tree, hf_rtp_marker, tvb, offset,
|
|
1, marker_set );
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_payload_type, tvb,
|
|
offset, 1, payload_type );
|
|
offset++;
|
|
|
|
/* Sequence number 16 bits (2 octets) */
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_seq_nr, tvb, offset, 2, seq_num );
|
|
offset += 2;
|
|
|
|
/* Timestamp 32 bits (4 octets) */
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_timestamp, tvb, offset, 4, timestamp );
|
|
offset += 4;
|
|
|
|
/* Synchronization source identifier 32 bits (4 octets) */
|
|
proto_tree_add_uint( rtp_tree, hf_rtp_ssrc, tvb, offset, 4, sync_src );
|
|
offset += 4;
|
|
} else {
|
|
offset += 12;
|
|
}
|
|
/* CSRC list*/
|
|
if ( csrc_count > 0 ) {
|
|
if ( tree ) {
|
|
ti = proto_tree_add_text(rtp_tree, tvb, offset, csrc_count * 4, "Contributing Source identifiers");
|
|
rtp_csrc_tree = proto_item_add_subtree( ti, ett_csrc_list );
|
|
}
|
|
for (i = 0; i < csrc_count; i++ ) {
|
|
csrc_item = tvb_get_ntohl( tvb, offset );
|
|
if ( tree ) proto_tree_add_uint_format( rtp_csrc_tree,
|
|
hf_rtp_csrc_item, tvb, offset, 4,
|
|
csrc_item,
|
|
"CSRC item %d: %u",
|
|
i, csrc_item );
|
|
offset += 4;
|
|
}
|
|
}
|
|
|
|
/* Optional RTP header extension */
|
|
if ( extension_set ) {
|
|
/* Defined by profile field is 16 bits (2 octets) */
|
|
if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_prof_define, tvb, offset, 2, tvb_get_ntohs( tvb, offset ) );
|
|
offset += 2;
|
|
|
|
hdr_extension = tvb_get_ntohs( tvb, offset );
|
|
if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_length, tvb,
|
|
offset, 2, hdr_extension);
|
|
offset += 2;
|
|
if ( hdr_extension > 0 ) {
|
|
if ( tree ) { ti = proto_tree_add_text(rtp_tree, tvb, offset, csrc_count * 4, "Header extensions");
|
|
/* I'm re-using the old tree variable here
|
|
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);
|
|
}
|
|
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),
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_padding,
|
|
{
|
|
"Padding",
|
|
"rtp.padding",
|
|
FT_BOOLEAN,
|
|
BASE_NONE,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_extension,
|
|
{
|
|
"Extension",
|
|
"rtp.ext",
|
|
FT_BOOLEAN,
|
|
BASE_NONE,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_csrc_count,
|
|
{
|
|
"Contributing source identifiers count",
|
|
"rtp.cc",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_marker,
|
|
{
|
|
"Marker",
|
|
"rtp.marker",
|
|
FT_BOOLEAN,
|
|
BASE_NONE,
|
|
NULL,
|
|
0x0,
|
|
"", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_rtp_payload_type,
|
|
{
|
|
"Payload type",
|
|
"rtp.p_type",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
VALS(rtp_payload_type_vals),
|
|
0x0,
|
|
"", 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");
|
|
|
|
#if 0
|
|
register_init_routine( &rtp_init );
|
|
#endif
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_rtp(void)
|
|
{
|
|
dissector_handle_t rtp_handle;
|
|
|
|
/*
|
|
* Get handles for the H.261 and MPEG-1 dissectors.
|
|
*/
|
|
h261_handle = find_dissector("h261");
|
|
mpeg1_handle = find_dissector("mpeg1");
|
|
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);
|
|
}
|