osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/epan/dissectors/packet-sdp.c

2059 lines
66 KiB
C
Raw Blame History

/* packet-sdp.c
* Routines for SDP packet disassembly (RFC 2327)
*
* Jason Lango <jal@netapp.com>
* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
* Ref http://www.ietf.org/rfc/rfc4566.txt?number=4566
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h> /* needed to define AF_ values on Windows */
#endif
#ifdef NEED_INET_V6DEFS_H
# include "wsutil/inet_v6defs.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include <epan/emem.h>
#include <epan/base64.h>
#include <epan/asn1.h>
#include <epan/tap.h>
#include "packet-sdp.h"
#include "packet-rtp.h"
#include <epan/rtp_pt.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include "packet-rtcp.h"
#include "packet-t38.h"
#include "packet-msrp.h"
#include "packet-per.h"
#include "packet-h245.h"
#include "packet-h264.h"
#include "packet-mp4ves.h"
static dissector_handle_t rtp_handle = NULL;
static dissector_handle_t rtcp_handle = NULL;
static dissector_handle_t t38_handle = NULL;
static dissector_handle_t msrp_handle = NULL;
static dissector_handle_t h264_handle = NULL;
static dissector_handle_t mp4ves_handle = NULL;
static int sdp_tap = -1;
static int proto_sdp = -1;
/* preference globals */
static gboolean global_sdp_establish_conversation = TRUE;
/* Top level fields */
static int hf_protocol_version = -1;
static int hf_owner = -1;
static int hf_session_name = -1;
static int hf_session_info = -1;
static int hf_uri = -1;
static int hf_email = -1;
static int hf_phone = -1;
static int hf_connection_info = -1;
static int hf_bandwidth = -1;
static int hf_timezone = -1;
static int hf_encryption_key = -1;
static int hf_session_attribute = -1;
static int hf_media_attribute = -1;
static int hf_time = -1;
static int hf_repeat_time = -1;
static int hf_media = -1;
static int hf_media_title = -1;
static int hf_unknown = -1;
static int hf_invalid = -1;
static int hf_ipbcp_version = -1;
static int hf_ipbcp_type = -1;
/* hf_owner subfields*/
static int hf_owner_username = -1;
static int hf_owner_sessionid = -1;
static int hf_owner_version = -1;
static int hf_owner_network_type = -1;
static int hf_owner_address_type = -1;
static int hf_owner_address = -1;
/* hf_connection_info subfields */
static int hf_connection_info_network_type = -1;
static int hf_connection_info_address_type = -1;
static int hf_connection_info_connection_address = -1;
static int hf_connection_info_ttl = -1;
static int hf_connection_info_num_addr = -1;
/* hf_bandwidth subfields */
static int hf_bandwidth_modifier = -1;
static int hf_bandwidth_value = -1;
/* hf_time subfields */
static int hf_time_start = -1;
static int hf_time_stop = -1;
/* hf_repeat_time subfield */
static int hf_repeat_time_interval = -1;
static int hf_repeat_time_duration = -1;
static int hf_repeat_time_offset = -1;
/* hf_timezone subfields */
static int hf_timezone_time = -1;
static int hf_timezone_offset = -1;
/* hf_encryption_key subfields */
static int hf_encryption_key_type = -1;
static int hf_encryption_key_data = -1;
/* hf_session_attribute subfields */
static int hf_session_attribute_field = -1;
static int hf_session_attribute_value = -1;
/* hf_media subfields */
static int hf_media_media = -1;
static int hf_media_port = -1;
static int hf_media_portcount = -1;
static int hf_media_proto = -1;
static int hf_media_format = -1;
/* hf_session_attribute subfields */
static int hf_media_attribute_field = -1;
static int hf_media_attribute_value = -1;
static int hf_media_encoding_name = -1;
static int hf_media_sample_rate = -1;
static int hf_media_format_specific_parameter = -1;
static int hf_sdp_fmtp_mpeg4_profile_level_id = -1;
static int hf_sdp_fmtp_h263_profile = -1;
static int hf_sdp_fmtp_h263_level = -1;
static int hf_sdp_h264_packetization_mode = -1;
static int hf_sdp_h264_sprop_parameter_sets = -1;
static int hf_SDPh223LogicalChannelParameters = -1;
/* hf_session_attribute hf_media_attribute subfields */
static int hf_key_mgmt_att_value = -1;
static int hf_key_mgmt_prtcl_id = -1;
static int hf_key_mgmt_data = -1;
/* trees */
static int ett_sdp = -1;
static int ett_sdp_owner = -1;
static int ett_sdp_connection_info = -1;
static int ett_sdp_bandwidth = -1;
static int ett_sdp_time = -1;
static int ett_sdp_repeat_time = -1;
static int ett_sdp_timezone = -1;
static int ett_sdp_encryption_key = -1;
static int ett_sdp_session_attribute = -1;
static int ett_sdp_media = -1;
static int ett_sdp_media_attribute = -1;
static int ett_sdp_fmtp = -1;
static int ett_sdp_key_mgmt = -1;
#define SDP_MAX_RTP_CHANNELS 4
#define SDP_MAX_RTP_PAYLOAD_TYPES 20
#define SDP_NO_OF_PT 128
typedef struct {
gint32 pt[SDP_MAX_RTP_PAYLOAD_TYPES];
gint8 pt_count;
GHashTable *rtp_dyn_payload;
} transport_media_pt_t;
typedef struct {
char *connection_address;
char *connection_type;
char *media_type;
char *encoding_name[SDP_NO_OF_PT];
int sample_rate[SDP_NO_OF_PT];
char *media_port[SDP_MAX_RTP_CHANNELS];
char *media_proto[SDP_MAX_RTP_CHANNELS];
transport_media_pt_t media[SDP_MAX_RTP_CHANNELS];
gint8 media_count;
} transport_info_t;
/* MSRP transport info (as set while parsing path attribute) */
static gboolean msrp_transport_address_set = FALSE;
static guint32 msrp_ipaddr[4];
static guint16 msrp_port_number;
/* key-mgmt dissector
* IANA registry:
* http://www.iana.org/assignments/sdp-parameters
*/
static dissector_table_t key_mgmt_dissector_table;
/* Protocol registration */
void proto_register_sdp(void);
void proto_reg_handoff_sdp(void);
/* static functions */
static void call_sdp_subdissector(tvbuff_t *tvb, packet_info *pinfo, int hf, proto_tree* ti, int lenght,
transport_info_t *transport_info);
/* Subdissector functions */
static void dissect_sdp_owner(tvbuff_t *tvb, proto_item* ti);
static void dissect_sdp_connection_info(tvbuff_t *tvb, proto_item* ti,
transport_info_t *transport_info);
static void dissect_sdp_bandwidth(tvbuff_t *tvb, proto_item *ti);
static void dissect_sdp_time(tvbuff_t *tvb, proto_item* ti);
static void dissect_sdp_repeat_time(tvbuff_t *tvb, proto_item* ti);
static void dissect_sdp_timezone(tvbuff_t *tvb, proto_item* ti);
static void dissect_sdp_encryption_key(tvbuff_t *tvb, proto_item * ti);
static void dissect_sdp_session_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_item *ti);
static void dissect_sdp_media(tvbuff_t *tvb, proto_item *ti,
transport_info_t *transport_info);
static void dissect_sdp_media_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_item *ti, int length,transport_info_t *transport_info);
static void free_encoding_name_str (void *ptr)
{
encoding_name_and_rate_t *encoding_name_and_rate = (encoding_name_and_rate_t *)ptr;
if (encoding_name_and_rate->encoding_name) {
g_free(encoding_name_and_rate->encoding_name);
}
}
static void
dissect_sdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *sdp_tree;
proto_item *ti, *sub_ti;
gint offset = 0;
gint next_offset;
int linelen;
gboolean in_media_description;
guchar type;
guchar delim;
int datalen;
int tokenoffset;
int hf = -1;
char *string;
address src_addr;
transport_info_t transport_info;
guint32 port=0;
gboolean is_rtp=FALSE;
gboolean is_srtp=FALSE;
gboolean is_t38=FALSE;
gboolean is_msrp=FALSE;
gboolean set_rtp=FALSE;
gboolean is_ipv4_addr=FALSE;
gboolean is_ipv6_addr=FALSE;
gboolean is_video=FALSE;
guint32 ipaddr[4];
gint n,i;
sdp_packet_info *sdp_pi;
gchar *unknown_encoding = ep_strdup("Unknown");
/* Initialise packet info for passing to tap */
sdp_pi = ep_alloc(sizeof(sdp_packet_info));
sdp_pi->summary_str[0] = '\0';
/* Initialise RTP channel info */
transport_info.connection_address=NULL;
transport_info.connection_type=NULL;
transport_info.media_type=NULL;
for (n=0; n < SDP_NO_OF_PT; n++){
transport_info.encoding_name[n]=unknown_encoding;
transport_info.sample_rate[n] = 0;
}
for (n=0; n < SDP_MAX_RTP_CHANNELS; n++)
{
transport_info.media_port[n]=NULL;
transport_info.media_proto[n]=NULL;
transport_info.media[n].pt_count = 0;
transport_info.media[n].rtp_dyn_payload =
g_hash_table_new_full( g_int_hash, g_int_equal, g_free, free_encoding_name_str);
}
transport_info.media_count = 0;
/*
* As RFC 2327 says, "SDP is purely a format for session
* description - it does not incorporate a transport protocol,
* and is intended to use different transport protocols as
* appropriate including the Session Announcement Protocol,
* Session Initiation Protocol, Real-Time Streaming Protocol,
* electronic mail using the MIME extensions, and the
* Hypertext Transport Protocol."
*
* We therefore don't set the protocol or info columns;
* instead, we append to them, so that we don't erase
* what the protocol inside which the SDP stuff resides
* put there.
*/
col_append_str(pinfo->cinfo, COL_PROTOCOL, "/SDP");
/* XXX: Needs description. */
col_append_str(pinfo->cinfo, COL_INFO, ", with session description");
ti = proto_tree_add_item(tree, proto_sdp, tvb, offset, -1, FALSE);
sdp_tree = proto_item_add_subtree(ti, ett_sdp);
/*
* Show the SDP message a line at a time.
*/
in_media_description = FALSE;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
/*
* Line must contain at least e.g. "v=".
*/
if (linelen < 2)
break;
type = tvb_get_guint8(tvb,offset);
delim = tvb_get_guint8(tvb,offset + 1);
if (delim != '=') {
proto_item *ti2 = proto_tree_add_item(sdp_tree, hf_invalid, tvb, offset, linelen, FALSE);
expert_add_info_format(pinfo, ti2, PI_MALFORMED, PI_NOTE,
"Invalid SDP line (no '=' delimiter)");
offset = next_offset;
continue;
}
/*
* Attributes.
*/
switch (type) {
case 'v':
hf = hf_protocol_version;
break;
case 'o':
hf = hf_owner;
break;
case 's':
hf = hf_session_name;
break;
case 'i':
if (in_media_description) {
hf = hf_media_title;
}
else{
hf = hf_session_info;
}
break;
case 'u':
hf = hf_uri;
break;
case 'e':
hf = hf_email;
break;
case 'p':
hf = hf_phone;
break;
case 'c':
hf = hf_connection_info;
break;
case 'b':
hf = hf_bandwidth;
break;
case 't':
hf = hf_time;
break;
case 'r':
hf = hf_repeat_time;
break;
case 'm':
hf = hf_media;
in_media_description = TRUE;
break;
case 'k':
hf = hf_encryption_key;
break;
case 'a':
if (in_media_description) {
hf = hf_media_attribute;
}
else{
hf = hf_session_attribute;
}
break;
case 'z':
hf = hf_timezone;
break;
default:
hf = hf_unknown;
break;
}
tokenoffset = 2;
if (hf == hf_unknown)
tokenoffset = 0;
string = (char*)tvb_get_ephemeral_string(tvb, offset + tokenoffset,
linelen - tokenoffset);
sub_ti = proto_tree_add_string(sdp_tree, hf, tvb, offset, linelen,
string);
call_sdp_subdissector(tvb_new_subset(tvb,offset+tokenoffset,
linelen-tokenoffset,
linelen-tokenoffset),
pinfo,
hf,sub_ti,linelen-tokenoffset,&transport_info),
offset = next_offset;
}
/* Now look, if we have strings collected.
* Try to convert ipv4 addresses and ports into binary format,
* so we can use them to detect rtp and rtcp streams.
* Don't forget to free the strings!
*/
for (n = 0; n < transport_info.media_count; n++)
{
if(transport_info.media_port[n]!=NULL) {
port = atol(transport_info.media_port[n]);
}
if(transport_info.media_proto[n]!=NULL) {
/* Check if media protocol is RTP
* and stream decoding is enabled in preferences
*/
if(global_sdp_establish_conversation){
/* Check if media protocol is RTP */
is_rtp = (strcmp(transport_info.media_proto[n],"RTP/AVP")==0);
/* Check if media protocol is SRTP */
is_srtp = (strcmp(transport_info.media_proto[n],"RTP/SAVP")==0);
/* Check if media protocol is T38 */
is_t38 = ( (strcmp(transport_info.media_proto[n],"UDPTL")==0) ||
(strcmp(transport_info.media_proto[n],"udptl")==0) );
/* Check if media protocol is MSRP/TCP */
is_msrp = (strcmp(transport_info.media_proto[n],"msrp/tcp")==0);
}
}
if(transport_info.connection_address!=NULL) {
if(transport_info.connection_type!=NULL) {
if (strcmp(transport_info.connection_type,"IP4")==0) {
if(inet_pton(AF_INET,transport_info.connection_address, &ipaddr)==1 ) {
/* connection_address could be converted to a valid ipv4 address*/
is_ipv4_addr=TRUE;
src_addr.type=AT_IPv4;
src_addr.len=4;
}
}
else if (strcmp(transport_info.connection_type,"IP6")==0){
if (inet_pton(AF_INET6, transport_info.connection_address, &ipaddr)==1){
/* connection_address could be converted to a valid ipv6 address*/
is_ipv6_addr=TRUE;
src_addr.type=AT_IPv6;
src_addr.len=16;
}
}
}
}
if (strcmp(transport_info.media_type,"video")==0){
is_video = TRUE;
}
set_rtp = FALSE;
/* Add (s)rtp and (s)rtcp conversation, if available (overrides t38 if conversation already set) */
if((!pinfo->fd->flags.visited) && port!=0 && (is_rtp||is_srtp) && (is_ipv4_addr || is_ipv6_addr)){
src_addr.data=(guint8*)&ipaddr;
if(rtp_handle){
if (is_srtp) {
struct srtp_info *dummy_srtp_info = se_alloc0(sizeof(struct srtp_info));
srtp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num, is_video,
transport_info.media[n].rtp_dyn_payload, dummy_srtp_info);
} else {
rtp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num, is_video,
transport_info.media[n].rtp_dyn_payload);
}
set_rtp = TRUE;
}
if(rtcp_handle){
port++;
rtcp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num);
}
}
/* Add t38 conversation, if available and only if no rtp */
if((!pinfo->fd->flags.visited) && port!=0 && !set_rtp && is_t38 && is_ipv4_addr){
src_addr.data=(guint8*)&ipaddr;
if(t38_handle){
t38_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num);
}
}
/* Add MSRP conversation. Uses addresses discovered in attribute
rather than connection information of media session line */
if (is_msrp ){
if ((!pinfo->fd->flags.visited) && msrp_transport_address_set){
if(msrp_handle){
src_addr.type=AT_IPv4;
src_addr.len=4;
src_addr.data=(guint8*)&msrp_ipaddr;
msrp_add_address(pinfo, &src_addr, msrp_port_number, "SDP", pinfo->fd->num);
}
}
}
/* Create the RTP summary str for the Voip Call analysis */
for (i = 0; i < transport_info.media[n].pt_count; i++)
{
/* if the payload type is dynamic (96 to 127), check the hash table to add the desc in the SDP summary */
if ( (transport_info.media[n].pt[i] >=96) && (transport_info.media[n].pt[i] <=127) ) {
encoding_name_and_rate_t *encoding_name_and_rate_pt = g_hash_table_lookup(transport_info.media[n].rtp_dyn_payload, &transport_info.media[n].pt[i]);
if (encoding_name_and_rate_pt)
g_snprintf(sdp_pi->summary_str, 50, "%s %s", sdp_pi->summary_str, encoding_name_and_rate_pt->encoding_name);
else
g_snprintf(sdp_pi->summary_str, 50, "%s %d", sdp_pi->summary_str, transport_info.media[n].pt[i]);
} else
g_snprintf(sdp_pi->summary_str, 50, "%s %s", sdp_pi->summary_str, val_to_str(transport_info.media[n].pt[i], rtp_payload_type_short_vals, "%u"));
}
/* Free the hash table if we did't assigned it to a conv use it */
if (set_rtp == FALSE)
rtp_free_hash_dyn_payload(transport_info.media[n].rtp_dyn_payload);
/* Create the T38 summary str for the Voip Call analysis */
if (is_t38) g_snprintf(sdp_pi->summary_str, 50, "%s t38", sdp_pi->summary_str);
}
/* Free the remainded hash tables not used */
for (n = transport_info.media_count; n < SDP_MAX_RTP_CHANNELS; n++)
{
rtp_free_hash_dyn_payload(transport_info.media[n].rtp_dyn_payload);
}
datalen = tvb_length_remaining(tvb, offset);
if (datalen > 0) {
proto_tree_add_text(sdp_tree, tvb, offset, datalen, "Data (%d bytes)",
datalen);
}
/* Report this packet to the tap */
tap_queue_packet(sdp_tap, pinfo, sdp_pi);
}
static void
call_sdp_subdissector(tvbuff_t *tvb, packet_info *pinfo, int hf, proto_tree* ti, int length,transport_info_t *transport_info){
if(hf == hf_owner){
dissect_sdp_owner(tvb,ti);
} else if ( hf == hf_connection_info) {
dissect_sdp_connection_info(tvb,ti,transport_info);
} else if ( hf == hf_bandwidth) {
dissect_sdp_bandwidth(tvb,ti);
} else if ( hf == hf_time) {
dissect_sdp_time(tvb,ti);
} else if ( hf == hf_repeat_time ){
dissect_sdp_repeat_time(tvb,ti);
} else if ( hf == hf_timezone ) {
dissect_sdp_timezone(tvb,ti);
} else if ( hf == hf_encryption_key ) {
dissect_sdp_encryption_key(tvb,ti);
} else if ( hf == hf_session_attribute ){
dissect_sdp_session_attribute(tvb,pinfo,ti);
} else if ( hf == hf_media ) {
dissect_sdp_media(tvb,ti,transport_info);
} else if ( hf == hf_media_attribute ){
dissect_sdp_media_attribute(tvb,pinfo,ti, length, transport_info);
}
}
static void
dissect_sdp_owner(tvbuff_t *tvb, proto_item *ti){
proto_tree *sdp_owner_tree;
gint offset,next_offset,tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_owner_tree = proto_item_add_subtree(ti,ett_sdp_owner);
/* Find the username */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_owner_tree, hf_owner_username, tvb, offset, tokenlen,
FALSE);
offset = next_offset + 1;
/* Find the session id */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_owner_tree, hf_owner_sessionid, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
/* Find the version */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_owner_tree, hf_owner_version, tvb, offset, tokenlen,
FALSE);
offset = next_offset + 1;
/* Find the network type */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_owner_tree, hf_owner_network_type, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
/* Find the address type */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_owner_tree, hf_owner_address_type, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
/* Find the address */
proto_tree_add_item(sdp_owner_tree,hf_owner_address, tvb, offset, -1, FALSE);
}
/*
* XXX - this can leak memory if an exception is thrown after we've fetched
* a string.
*/
static void
dissect_sdp_connection_info(tvbuff_t *tvb, proto_item* ti,
transport_info_t *transport_info){
proto_tree *sdp_connection_info_tree;
gint offset,next_offset,tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_connection_info_tree = proto_item_add_subtree(ti,
ett_sdp_connection_info);
/* Find the network type */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_network_type, tvb, offset, tokenlen,
FALSE);
offset = next_offset + 1;
/* Find the address type */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
/* Save connection address type */
transport_info->connection_type = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_address_type, tvb, offset, tokenlen,
FALSE);
offset = next_offset + 1;
/* Find the connection address */
/* XXX - what if there's a <number of addresses> value? */
next_offset = tvb_find_guint8(tvb,offset,-1,'/');
if( next_offset == -1){
tokenlen = -1; /* end of tvbuff */
/* Save connection address */
transport_info->connection_address =
(char*)tvb_get_ephemeral_string(tvb, offset, tvb_length_remaining(tvb, offset));
} else {
tokenlen = next_offset - offset;
/* Save connection address */
transport_info->connection_address = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
}
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_connection_address, tvb, offset,
tokenlen, FALSE);
if(next_offset != -1){
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset,-1,'/');
if( next_offset == -1){
tokenlen = -1; /* end of tvbuff */
} else {
tokenlen = next_offset - offset;
}
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_ttl, tvb, offset, tokenlen, FALSE);
if(next_offset != -1){
offset = next_offset + 1;
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_num_addr, tvb, offset, -1, FALSE);
}
}
}
static void
dissect_sdp_bandwidth(tvbuff_t *tvb, proto_item *ti){
proto_tree * sdp_bandwidth_tree;
gint offset, next_offset, tokenlen;
proto_item *item;
gboolean unit_is_kbs = FALSE;
gboolean unit_is_bps = FALSE;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_bandwidth_tree = proto_item_add_subtree(ti,ett_sdp_bandwidth);
/* find the modifier */
next_offset = tvb_find_guint8(tvb,offset,-1,':');
if( next_offset == -1)
return;
tokenlen = next_offset - offset;
item = proto_tree_add_item(sdp_bandwidth_tree, hf_bandwidth_modifier, tvb, offset,
tokenlen, FALSE);
if (tvb_strneql(tvb, offset, "CT", 2) == 0){
proto_item_append_text(item, " [Conference Total(total bandwidth of all RTP sessions)]");
unit_is_kbs = TRUE;
}else if (tvb_strneql(tvb, offset, "AS", 2) == 0){
proto_item_append_text(item, " [Application Specific (RTP session bandwidth)]");
unit_is_kbs = TRUE;
}else if (tvb_strneql(tvb, offset, "TIAS", 4) == 0){
proto_item_append_text(item, " [Transport Independent Application Specific maximum]");
unit_is_bps = TRUE;
}
offset = next_offset + 1;
item = proto_tree_add_item(sdp_bandwidth_tree, hf_bandwidth_value, tvb, offset, -1,
FALSE);
if (unit_is_kbs == TRUE)
proto_item_append_text(item, " kb/s");
if (unit_is_bps == TRUE)
proto_item_append_text(item, " b/s");
}
static void dissect_sdp_time(tvbuff_t *tvb, proto_item* ti){
proto_tree *sdp_time_tree;
gint offset,next_offset, tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_time_tree = proto_item_add_subtree(ti,ett_sdp_time);
/* get start time */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_time_tree, hf_time_start, tvb, offset, tokenlen,
FALSE);
/* get stop time */
offset = next_offset + 1;
proto_tree_add_item(sdp_time_tree, hf_time_stop, tvb, offset, -1, FALSE);
}
static void dissect_sdp_repeat_time(tvbuff_t *tvb, proto_item* ti){
proto_tree *sdp_repeat_time_tree;
gint offset,next_offset, tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_repeat_time_tree = proto_item_add_subtree(ti,ett_sdp_time);
/* get interval */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_repeat_time_tree, hf_repeat_time_interval, tvb,
offset, tokenlen, FALSE);
/* get duration */
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1 )
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_repeat_time_tree,hf_repeat_time_duration, tvb,
offset, tokenlen, FALSE);
/* get offsets */
do{
offset = next_offset +1;
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset != -1){
tokenlen = next_offset - offset;
} else {
tokenlen = -1; /* end of tvbuff */
}
proto_tree_add_item(sdp_repeat_time_tree, hf_repeat_time_offset,
tvb, offset, tokenlen, FALSE);
} while( next_offset != -1 );
}
static void
dissect_sdp_timezone(tvbuff_t *tvb, proto_item* ti){
proto_tree* sdp_timezone_tree;
gint offset, next_offset, tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_timezone_tree = proto_item_add_subtree(ti,ett_sdp_timezone);
do{
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset == -1)
break;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_timezone_tree, hf_timezone_time, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset != -1){
tokenlen = next_offset - offset;
} else {
tokenlen = -1; /* end of tvbuff */
}
proto_tree_add_item(sdp_timezone_tree, hf_timezone_offset, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
} while (next_offset != -1);
}
static void dissect_sdp_encryption_key(tvbuff_t *tvb, proto_item * ti){
proto_tree *sdp_encryption_key_tree;
gint offset, next_offset, tokenlen;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_encryption_key_tree = proto_item_add_subtree(ti,ett_sdp_encryption_key);
next_offset = tvb_find_guint8(tvb,offset,-1,':');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_encryption_key_tree,hf_encryption_key_type,
tvb, offset, tokenlen, FALSE);
offset = next_offset + 1;
proto_tree_add_item(sdp_encryption_key_tree,hf_encryption_key_data,
tvb, offset, -1, FALSE);
}
static void dissect_key_mgmt(tvbuff_t *tvb, packet_info * pinfo, proto_item * ti){
gchar *data_p = NULL;
gchar *prtcl_id = NULL;
gint len;
tvbuff_t *keymgmt_tvb;
gboolean found_match = FALSE;
proto_tree *key_tree;
gint next_offset;
gint offset = 0;
gint tokenlen;
key_tree = proto_item_add_subtree(ti, ett_sdp_key_mgmt);
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if (next_offset == -1)
return;
tokenlen = next_offset - offset;
prtcl_id = tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_item(key_tree, hf_key_mgmt_prtcl_id, tvb, offset, tokenlen, FALSE);
offset = next_offset + 1;
len = tvb_length_remaining(tvb, offset);
if (len < 0)
return;
data_p = tvb_get_ephemeral_string(tvb, offset, len);
keymgmt_tvb = base64_to_tvb(tvb, data_p);
add_new_data_source(pinfo, keymgmt_tvb, "Key Management Data");
if ( prtcl_id != NULL && key_mgmt_dissector_table != NULL ) {
found_match = dissector_try_string(key_mgmt_dissector_table,
prtcl_id,
keymgmt_tvb, pinfo,
key_tree);
}
if (found_match) {
proto_item *ti2 = proto_tree_add_item(key_tree, hf_key_mgmt_data,
keymgmt_tvb, 0, -1, FALSE);
PROTO_ITEM_SET_HIDDEN(ti2);
}
else {
proto_tree_add_item(key_tree, hf_key_mgmt_data,
keymgmt_tvb, 0, -1, FALSE);
}
}
static void dissect_sdp_session_attribute(tvbuff_t *tvb, packet_info * pinfo, proto_item * ti){
proto_tree *sdp_session_attribute_tree;
gint offset, next_offset, tokenlen;
guint8 *field_name;
offset = 0;
next_offset = 0;
tokenlen = 0;
sdp_session_attribute_tree = proto_item_add_subtree(ti,
ett_sdp_session_attribute);
next_offset = tvb_find_guint8(tvb,offset,-1,':');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_session_attribute_tree, hf_session_attribute_field,
tvb, offset, tokenlen, FALSE);
field_name = tvb_get_ephemeral_string(tvb, offset, tokenlen);
offset = next_offset + 1;
if (strcmp((char*)field_name, "ipbcp") == 0) {
offset = tvb_pbrk_guint8(tvb,offset,-1,(guint8 *)"0123456789", NULL);
if (offset == -1)
return;
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if (next_offset == -1)
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_session_attribute_tree,hf_ipbcp_version,tvb,offset,tokenlen,FALSE);
offset = tvb_pbrk_guint8(tvb,offset,-1,(guint8 *)"ABCDEFGHIJKLMNOPQRSTUVWXYZ", NULL);
if (offset == -1)
return;
tokenlen = tvb_find_line_end(tvb,offset,-1, &next_offset, FALSE);
if (tokenlen == -1)
return;
proto_tree_add_item(sdp_session_attribute_tree,hf_ipbcp_type,tvb,offset,tokenlen,FALSE);
} else if (strcmp((char*)field_name, "key-mgmt") == 0) {
tvbuff_t *key_tvb;
proto_item *key_ti;
key_tvb = tvb_new_subset_remaining(tvb, offset);
key_ti = proto_tree_add_item(sdp_session_attribute_tree, hf_key_mgmt_att_value, key_tvb, 0, -1, FALSE);
dissect_key_mgmt(key_tvb, pinfo, key_ti);
} else {
proto_tree_add_item(sdp_session_attribute_tree, hf_session_attribute_value,
tvb, offset, -1, FALSE);
}
}
/* Dissect media description */
static void
dissect_sdp_media(tvbuff_t *tvb, proto_item *ti,
transport_info_t *transport_info){
proto_tree *sdp_media_tree;
gint offset, next_offset, tokenlen, idx;
guint8 *media_format;
offset = 0;
next_offset = 0;
tokenlen = 0;
/* Re-initialise for a new media description */
msrp_transport_address_set = FALSE;
/* Create tree for media session */
sdp_media_tree = proto_item_add_subtree(ti,ett_sdp_media);
next_offset = tvb_find_guint8(tvb,offset, -1, ' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
/* Type of media session */
proto_tree_add_item(sdp_media_tree, hf_media_media, tvb, offset, tokenlen,
FALSE);
transport_info->media_type = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset, -1, ' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
next_offset = tvb_find_guint8(tvb,offset, tokenlen, '/');
if(next_offset != -1){
tokenlen = next_offset - offset;
/* Save port info */
transport_info->media_port[transport_info->media_count] = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_uint(sdp_media_tree, hf_media_port, tvb, offset, tokenlen,
atoi((char*)tvb_get_ephemeral_string(tvb, offset, tokenlen)));
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset, -1, ' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_media_tree, hf_media_portcount, tvb, offset,
tokenlen, FALSE);
offset = next_offset + 1;
} else {
next_offset = tvb_find_guint8(tvb,offset, -1, ' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
/* Save port info */
transport_info->media_port[transport_info->media_count] = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
/* XXX Remember Port */
proto_tree_add_uint(sdp_media_tree, hf_media_port, tvb, offset, tokenlen,
atoi((char*)tvb_get_ephemeral_string(tvb, offset, tokenlen)));
offset = next_offset + 1;
}
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if( next_offset == -1)
return;
tokenlen = next_offset - offset;
/* Save port protocol */
transport_info->media_proto[transport_info->media_count] = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
/* XXX Remember Protocol */
proto_tree_add_item(sdp_media_tree, hf_media_proto, tvb, offset, tokenlen,
FALSE);
do {
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset == -1){
tokenlen = tvb_length_remaining(tvb, offset); /* End of tvbuff */
if (tokenlen == 0)
break; /* Nothing more left */
} else {
tokenlen = next_offset - offset;
}
if (strcmp(transport_info->media_proto[transport_info->media_count],
"RTP/AVP") == 0) {
media_format = tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_string(sdp_media_tree, hf_media_format, tvb, offset,
tokenlen, val_to_str(atol((char*)media_format), rtp_payload_type_vals, "%u"));
idx = transport_info->media[transport_info->media_count].pt_count;
transport_info->media[transport_info->media_count].pt[idx] = atol((char*)media_format);
if (idx < (SDP_MAX_RTP_PAYLOAD_TYPES-1))
transport_info->media[transport_info->media_count].pt_count++;
} else {
proto_tree_add_item(sdp_media_tree, hf_media_format, tvb, offset,
tokenlen, FALSE);
}
} while (next_offset != -1);
/* Increase the count of media channels, but don't walk off the end
of the arrays. */
if (transport_info->media_count < (SDP_MAX_RTP_CHANNELS-1)){
transport_info->media_count++;
}
/* XXX Dissect traffic to "Port" as "Protocol"
* Remember this Port/Protocol pair so we can tear it down again later
* Actually, it's harder than that:
* We need to find out the address of the other side first and it
* looks like that info can be found in SIP headers only.
*/
}
static tvbuff_t *
ascii_bytes_to_tvb(tvbuff_t *tvb, packet_info *pinfo, gint len, gchar *msg)
{
guint8 *buf = g_malloc(10240);
/* arbitrary maximum length */
if(len<20480){
int i;
tvbuff_t *bytes_tvb;
/* first, skip to where the encoded pdu starts, this is
the first hex digit after the '=' char.
*/
while(1){
if((*msg==0)||(*msg=='\n')){
return NULL;
}
if(*msg=='='){
msg++;
break;
}
msg++;
}
while(1){
if((*msg==0)||(*msg=='\n')){
return NULL;
}
if( ((*msg>='0')&&(*msg<='9'))
|| ((*msg>='a')&&(*msg<='f'))
|| ((*msg>='A')&&(*msg<='F'))){
break;
}
msg++;
}
i=0;
while( ((*msg>='0')&&(*msg<='9'))
||((*msg>='a')&&(*msg<='f'))
||((*msg>='A')&&(*msg<='F')) ){
int val;
if((*msg>='0')&&(*msg<='9')){
val=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val=(*msg)-'A'+10;
} else {
return NULL;
}
val<<=4;
msg++;
if((*msg>='0')&&(*msg<='9')){
val|=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val|=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val|=(*msg)-'A'+10;
} else {
return NULL;
}
msg++;
buf[i]=(guint8)val;
i++;
}
if(i==0){
return NULL;
}
bytes_tvb = tvb_new_child_real_data(tvb, buf,i,i);
tvb_set_free_cb(bytes_tvb, g_free);
add_new_data_source(pinfo, bytes_tvb, "ASCII bytes to tvb");
return bytes_tvb;
}
return NULL;
}
/* Annex X Profiles and levels definition */
static const value_string h263_profile_vals[] =
{
{ 0, "Baseline Profile" },
{ 1, "H.320 Coding Efficiency Version 2 Backward-Compatibility Profile" },
{ 2, "Version 1 Backward-Compatibility Profile" },
{ 3, "Version 2 Interactive and Streaming Wireless Profile" },
{ 4, "Version 3 Interactive and Streaming Wireless Profile" },
{ 5, "Conversational High Compression Profile" },
{ 6, "Conversational Internet Profile" },
{ 7, "Conversational Interlace Profile" },
{ 8, "High Latency Profile" },
{ 0, NULL },
};
/* RFC 4629 The level are described in table X.2 of H.263 annex X */
static const value_string h263_level_vals[] =
{
{ 10, "QCIF (176 x 144), 1 x 64Kb/s" },
{ 20, "CIF (352 x 288), 2 x 64Kb/s" },
{ 30, "CIF (352 x 288), 6 x 64Kb/s" },
{ 40, "CIF (352 x 288), 32 x 64Kb/s" },
{ 45, "QCIF (176 x144) support of CPFMT, 2 x 64Kb/s" },
{ 50, "CIF (352 x 288) support of CPFMT, 64 x 64Kb/s" },
{ 60, "CPFMT: 720 x 288 support of CPFMT, 128 x 64Kb/s" },
{ 70, "CPFMT: 720 x 576 support of CPFMT, 256 x 64Kb/s" },
{ 0, NULL },
};
static const value_string h264_packetization_mode_vals[] =
{
{ 0, "Single NAL mode" },
{ 1, "Non-interleaved mode" },
{ 2, "Interleaved mode" },
{ 0, NULL },
};
/*
* TODO: Make this a more generic routine to dissect fmtp parameters depending on media types
*/
static void
decode_sdp_fmtp(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, gint offset, gint tokenlen, char *mime_type){
gint next_offset;
gint end_offset;
guint8 *field_name;
gchar *format_specific_parameter;
proto_item *item;
tvbuff_t *data_tvb;
end_offset = offset + tokenlen;
/*
proto_tree_add_text(tree, tvb, offset, tokenlen, "Debug; Analysed string: '%s'",
tvb_get_ephemeral_string(tvb, offset, tokenlen));
*/
/* Look for an '=' within this value - this may indicate that there is a
profile-level-id parameter to find if the MPEG4 media type is in use */
next_offset = tvb_find_guint8(tvb,offset,-1,'=');
if (next_offset == -1)
{
/* Give up (and avoid exception) if '=' not found */
return;
}
/* Find the name of the parameter */
tokenlen = next_offset - offset;
field_name = tvb_get_ephemeral_string(tvb, offset, tokenlen);
/*proto_tree_add_text(tree, tvb, offset, tokenlen, "Debug; MIMEtype '%s'Parameter name: '%s'", mime_type, field_name); */
offset = next_offset;
/* Dissect the MPEG4 profile-level-id parameter if present */
if (mime_type != NULL && g_ascii_strcasecmp(mime_type, "MP4V-ES") == 0) {
if (strcmp((char*)field_name, "profile-level-id") == 0) {
offset++;
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_mpeg4_profile_level_id, tvb, offset, tokenlen,
atol((char*)format_specific_parameter));
PROTO_ITEM_SET_GENERATED(item);
} else if (strcmp((char*)field_name, "config") == 0) {
/* String including "=" */
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
/* ascii_bytes_to_tvb requires the "=" to be in the buffer */
data_tvb = ascii_bytes_to_tvb(tvb, pinfo, tokenlen, format_specific_parameter);
if(mp4ves_handle && data_tvb){
dissect_mp4ves_config(data_tvb, pinfo, tree);
}
}
}
/* Dissect the H263-2000 profile parameter if present */
if ((mime_type != NULL && g_ascii_strcasecmp(mime_type, "H263-2000") == 0)||(mime_type != NULL && g_ascii_strcasecmp(mime_type, "H263-1998") == 0)) {
if (strcmp((char*)field_name, "profile") == 0) {
offset++;
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_h263_profile, tvb, offset, tokenlen,
atol((char*)format_specific_parameter));
PROTO_ITEM_SET_GENERATED(item);
} else if(strcmp((char*)field_name, "level") == 0) {
offset++;
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_h263_level, tvb, offset, tokenlen,
atol((char*)format_specific_parameter));
PROTO_ITEM_SET_GENERATED(item);
}
}
/* Dissect the H264 profile-level-id parameter
* RFC 3984:
* A base16 [6] (hexadecimal) representation of
* the following three bytes in the sequence
* parameter set NAL unit specified in [1]: 1)
* profile_idc, 2) a byte herein referred to as
* profile-iop, composed of the values of
* constraint_set0_flag, constraint_set1_flag,
* constraint_set2_flag, and reserved_zero_5bits
* in bit-significance order, starting from the
* most significant bit, and 3) level_idc.
*/
if (mime_type != NULL && g_ascii_strcasecmp(mime_type, "H264") == 0) {
if (strcmp(field_name, "profile-level-id") == 0) {
int length;
/* Length includes "=" as it's required by ascii_bytes_to_tvb()*/
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
data_tvb = ascii_bytes_to_tvb(tvb, pinfo, tokenlen, format_specific_parameter);
length = tvb_length(data_tvb);
if (length == 3){
if(h264_handle && data_tvb){
dissect_h264_profile(data_tvb, pinfo, tree);
}
}else{
item = proto_tree_add_text(tree, tvb, offset, tokenlen, "Incorrectly coded, must be three bytes");
PROTO_ITEM_SET_GENERATED(item);
}
}else if (strcmp(field_name, "packetization-mode") == 0) {
offset++;
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_ephemeral_string(tvb, offset, tokenlen);
item = proto_tree_add_uint(tree, hf_sdp_h264_packetization_mode, tvb, offset, tokenlen,
atol((char*)format_specific_parameter));
PROTO_ITEM_SET_GENERATED(item);
}else if (strcmp(field_name, "sprop-parameter-sets") == 0) {
/* The value of the parameter is the
base64 [6] representation of the initial
parameter set NAL units as specified in
sections 7.3.2.1 and 7.3.2.2 of [1]. The
parameter sets are conveyed in decoding order,
and no framing of the parameter set NAL units
takes place. A comma is used to separate any
pair of parameter sets in the list.
*/
gchar *data_p = NULL;
gint comma_offset;
/* Move past '=' */
offset++;
comma_offset = tvb_find_guint8(tvb,offset,-1,',');
if (comma_offset != -1){
tokenlen = comma_offset - offset;
}else{
tokenlen = end_offset - offset;
}
data_p = tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_text(tree, tvb, offset, tokenlen, "NAL unit 1 string: %s", data_p);
/* proto_tree_add_text(tree, tvb, offset, tokenlen, "String %s",data_p); */
data_tvb = base64_to_tvb(tvb, data_p);
add_new_data_source(pinfo, data_tvb, "h264 prop-parameter-sets");
if(h264_handle && data_tvb){
dissect_h264_nal_unit(data_tvb, pinfo, tree);
if (comma_offset != -1){
/* Second NAL unit */
offset = comma_offset +1;
tokenlen = end_offset - offset;
data_p = tvb_get_ephemeral_string(tvb, offset, tokenlen);
proto_tree_add_text(tree, tvb, offset, tokenlen, "NAL unit 2 string: %s", data_p);
data_tvb = base64_to_tvb(tvb, data_p);
add_new_data_source(pinfo, data_tvb, "h264 prop-parameter-sets 2");
dissect_h264_nal_unit(data_tvb, pinfo, tree);
}
}
}
}
}
typedef struct {
const char *name;
} sdp_names_t;
#define SDP_RTPMAP 1
#define SDP_FMTP 2
#define SDP_PATH 3
#define SDP_H248_ITEM 4
static const sdp_names_t sdp_media_attribute_names[] = {
{ "Unknown-name"}, /* 0 Pad so that the real headers start at index 1 */
{ "rtpmap"}, /* 1 */
{ "fmtp"}, /* 2 */
{ "path"}, /* 3 */
{ "h248item"}, /* 4 */
};
static gint find_sdp_media_attribute_names(tvbuff_t *tvb, int offset, guint len)
{
guint i;
for (i = 1; i < array_length(sdp_media_attribute_names); i++) {
if (len == strlen(sdp_media_attribute_names[i].name) &&
tvb_strncaseeql(tvb, offset, sdp_media_attribute_names[i].name, len) == 0)
return i;
}
return -1;
}
static void dissect_sdp_media_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_item * ti, int length, transport_info_t *transport_info){
proto_tree *sdp_media_attribute_tree;
proto_item *fmtp_item, *media_format_item;
proto_tree *fmtp_tree;
gint offset, next_offset, tokenlen, n, colon_offset;
gint start_offset;
guint8 *field_name;
guint8 *payload_type;
guint8 *attribute_value;
gint *key;
guint8 pt;
gint sdp_media_attrbute_code;
const char *msrp_res = "msrp://";
const char *h324ext_h223lcparm = "h324ext/h223lcparm";
gboolean has_more_pars = TRUE;
tvbuff_t *h245_tvb;
encoding_name_and_rate_t *encoding_name_and_rate;
offset = 0;
next_offset = 0;
tokenlen = 0;
/* Create attribute tree */
sdp_media_attribute_tree = proto_item_add_subtree(ti,
ett_sdp_media_attribute);
/* Find end of field */
colon_offset = tvb_find_guint8(tvb,offset,-1,':');
if(colon_offset == -1)
return;
/* Attribute field name is token before ':' */
tokenlen = colon_offset - offset;
proto_tree_add_item(sdp_media_attribute_tree,
hf_media_attribute_field,
tvb, offset, tokenlen, FALSE);
field_name = tvb_get_ephemeral_string(tvb, offset, tokenlen);
sdp_media_attrbute_code = find_sdp_media_attribute_names(tvb, offset, tokenlen);
/* Skip colon */
offset = colon_offset + 1;
/* skip leading wsp */
offset = tvb_skip_wsp(tvb,offset,tvb_length_remaining(tvb,offset));
/* Value is the remainder of the line */
attribute_value = tvb_get_ephemeral_string(tvb, offset, tvb_length_remaining(tvb, offset));
/*********************************************/
/* Special parsing for some field name types */
switch (sdp_media_attrbute_code){
case SDP_RTPMAP:
/* decode the rtpmap to see if it is DynamicPayload to dissect them automatic */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_media_attribute_tree, hf_media_format, tvb,
offset, tokenlen, FALSE);
payload_type = tvb_get_ephemeral_string(tvb, offset, tokenlen);
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb,offset,-1,'/');
if(next_offset == -1){
return;
}
tokenlen = next_offset - offset;
start_offset = offset;
proto_tree_add_item(sdp_media_attribute_tree, hf_media_encoding_name, tvb,
offset, tokenlen, FALSE);
key=g_malloc( sizeof(gint) );
*key=atol((char*)payload_type);
pt = atoi((char*)payload_type);
if (pt >= SDP_NO_OF_PT) {
return; /* Invalid */
}
transport_info->encoding_name[pt] = (char*)tvb_get_ephemeral_string(tvb, offset, tokenlen);
next_offset = next_offset + 1;
offset = next_offset;
while (length-1 >= next_offset){
if(!isdigit(tvb_get_guint8(tvb, next_offset)))
break;
next_offset++;
}
tokenlen = next_offset - offset;
proto_tree_add_item(sdp_media_attribute_tree, hf_media_sample_rate, tvb,
offset, tokenlen, FALSE);
transport_info->sample_rate[pt] = atoi(tvb_get_ephemeral_string(tvb, offset, tokenlen));
/* As per RFC2327 it is possible to have multiple Media Descriptions ("m=").
For example:
a=rtpmap:101 G726-32/8000
m=audio 49170 RTP/AVP 0 97
a=rtpmap:97 telephone-event/8000
m=audio 49172 RTP/AVP 97 101
a=rtpmap:97 G726-24/8000
The Media attributes ("a="s) after the "m=" only apply for that "m=".
If there is an "a=" before the first "m=", that attribute applies for
all the session (all the "m="s).
*/
/* so, if this "a=" appear before any "m=", we add it to all the dynamic
* hash tables
*/
if (transport_info->media_count == 0) {
for (n=0; n < SDP_MAX_RTP_CHANNELS; n++) {
encoding_name_and_rate = g_malloc( sizeof(encoding_name_and_rate_t));
encoding_name_and_rate->encoding_name = g_strdup(transport_info->encoding_name[pt]);
encoding_name_and_rate->sample_rate = transport_info->sample_rate[pt];
if (n==0){
g_hash_table_insert(transport_info->media[n].rtp_dyn_payload,
key, encoding_name_and_rate);
}
else { /* we create a new key and encoding_name to assign to the other hash tables */
gint *key2;
key2=g_malloc( sizeof(gint) );
*key2=atol((char*)payload_type);
g_hash_table_insert(transport_info->media[n].rtp_dyn_payload,
key2, encoding_name_and_rate);
}
}
return;
/* if the "a=" is after an "m=", only apply to this "m=" */
}else
/* in case there is an overflow in SDP_MAX_RTP_CHANNELS, we keep always the last "m=" */
encoding_name_and_rate = g_malloc( sizeof(encoding_name_and_rate_t));
encoding_name_and_rate->encoding_name = g_strdup(transport_info->encoding_name[pt]);
encoding_name_and_rate->sample_rate = transport_info->sample_rate[pt];
if (transport_info->media_count == SDP_MAX_RTP_CHANNELS-1)
g_hash_table_insert(transport_info->media[ transport_info->media_count ].rtp_dyn_payload,
key, encoding_name_and_rate);
else
g_hash_table_insert(transport_info->media[ transport_info->media_count-1 ].rtp_dyn_payload,
key, encoding_name_and_rate);
break;
case SDP_FMTP:
if(sdp_media_attribute_tree){
guint8 media_format;
/* Reading the Format parameter(fmtp) */
/* Skip leading space, if any */
offset = tvb_skip_wsp(tvb,offset,tvb_length_remaining(tvb,offset));
/* Media format extends to the next space */
next_offset = tvb_find_guint8(tvb,offset,-1,' ');
if(next_offset == -1)
return;
tokenlen = next_offset - offset;
media_format_item = proto_tree_add_item(sdp_media_attribute_tree,
hf_media_format, tvb, offset,
tokenlen, FALSE);
media_format = atoi((char*)tvb_get_ephemeral_string(tvb, offset, tokenlen));
if (media_format >= SDP_NO_OF_PT) {
return; /* Invalid */
}
/* Append encoding name to format if known */
proto_item_append_text(media_format_item, " [%s]",
transport_info->encoding_name[media_format]);
payload_type = tvb_get_ephemeral_string(tvb, offset, tokenlen);
/* Move offset past the payload type */
offset = next_offset + 1;
while(has_more_pars==TRUE){
next_offset = tvb_find_guint8(tvb,offset,-1,';');
offset = tvb_skip_wsp(tvb,offset,tvb_length_remaining(tvb,offset));
if(next_offset == -1){
has_more_pars = FALSE;
next_offset= tvb_length(tvb);
}else{
}
/* There are at least 2 - add the first parameter */
tokenlen = next_offset - offset;
fmtp_item = proto_tree_add_item(sdp_media_attribute_tree,
hf_media_format_specific_parameter, tvb,
offset, tokenlen, FALSE);
fmtp_tree = proto_item_add_subtree(fmtp_item, ett_sdp_fmtp);
decode_sdp_fmtp(fmtp_tree, tvb, pinfo, offset, tokenlen,
transport_info->encoding_name[media_format]);
/* Move offset past "; " and onto firts char */
offset = next_offset + 1;
}
}
break;
case SDP_PATH:
/* msrp attributes that contain address needed for conversation */
if (strncmp((char*)attribute_value, msrp_res, strlen(msrp_res)) == 0){
int address_offset, port_offset, port_end_offset;
/* Address starts here */
address_offset = offset + (int)strlen(msrp_res);
/* Port is after next ':' */
port_offset = tvb_find_guint8(tvb, address_offset, -1, ':');
/* Check if port is present if not skipp */
if(port_offset!=-1){
/* Port ends with '/' */
port_end_offset = tvb_find_guint8(tvb, port_offset, -1, '/');
/* Attempt to convert address */
if (inet_pton(AF_INET, (char*)tvb_get_ephemeral_string(tvb, address_offset, port_offset-address_offset), &msrp_ipaddr) > 0) {
/* Get port number */
msrp_port_number = atoi((char*)tvb_get_ephemeral_string(tvb, port_offset+1, port_end_offset-port_offset-1));
/* Set flag so this info can be used */
msrp_transport_address_set = TRUE;
}
}
}
break;
case SDP_H248_ITEM:
/* Decode h248 item ITU-T Rec. H.248.12 (2001)/Amd.1 (11/2002)*/
if (strncmp((char*)attribute_value, h324ext_h223lcparm, strlen(msrp_res)) == 0){
/* A.5.1.3 H.223 Logical channel parameters
* This property indicates the H.245
* H223LogicalChannelsParameters structure encoded by applying the PER specified in
* ITU-T Rec. X.691. Value encoded as per A.5.1.2. For text encoding the mechanism defined
* in ITU-T Rec. H.248.15 is used.
*/
gint len;
asn1_ctx_t actx;
len = (gint)strlen(attribute_value);
h245_tvb = ascii_bytes_to_tvb(tvb, pinfo, len, attribute_value);
/* arbitrary maximum length */
/* should go through a handle, however, the two h245 entry
points are different, one is over tpkt and the other is raw
*/
if (h245_tvb){
asn1_ctx_init(&actx, ASN1_ENC_PER, TRUE, pinfo);
dissect_h245_H223LogicalChannelParameters(h245_tvb, 0, &actx, sdp_media_attribute_tree, hf_SDPh223LogicalChannelParameters);
}
}
break;
default:
/* No special treatment for values of this attribute type, just add as one item. */
proto_tree_add_item(sdp_media_attribute_tree, hf_media_attribute_value,
tvb, offset, -1, FALSE);
break;
}
}
void
proto_register_sdp(void)
{
static hf_register_info hf[] = {
{ &hf_protocol_version,
{ "Session Description Protocol Version (v)",
"sdp.version", FT_STRING, BASE_NONE,NULL,0x0,
NULL, HFILL }},
{ &hf_owner,
{ "Owner/Creator, Session Id (o)",
"sdp.owner", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL}},
{ &hf_session_name,
{ "Session Name (s)",
"sdp.session_name", FT_STRING, BASE_NONE,NULL, 0x0,
NULL, HFILL }},
{ &hf_session_info,
{ "Session Information (i)",
"sdp.session_info", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_uri,
{ "URI of Description (u)",
"sdp.uri", FT_STRING, BASE_NONE,NULL, 0x0,
NULL, HFILL }},
{ &hf_email,
{ "E-mail Address (e)",
"sdp.email", FT_STRING, BASE_NONE, NULL, 0x0,
"E-mail Address", HFILL }},
{ &hf_phone,
{ "Phone Number (p)",
"sdp.phone", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info,
{ "Connection Information (c)",
"sdp.connection_info", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bandwidth,
{ "Bandwidth Information (b)",
"sdp.bandwidth", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_timezone,
{ "Time Zone Adjustments (z)",
"sdp.timezone", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_encryption_key,
{ "Encryption Key (k)",
"sdp.encryption_key", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_session_attribute,
{ "Session Attribute (a)",
"sdp.session_attr", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_attribute,
{ "Media Attribute (a)",
"sdp.media_attr", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_time,
{ "Time Description, active time (t)",
"sdp.time", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_repeat_time,
{ "Repeat Time (r)",
"sdp.repeat_time", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media,
{ "Media Description, name and address (m)",
"sdp.media", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_title,
{ "Media Title (i)",
"sdp.media_title",FT_STRING, BASE_NONE, NULL, 0x0,
"Media Title", HFILL }},
{ &hf_unknown,
{ "Unknown",
"sdp.unknown",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_invalid,
{ "Invalid line",
"sdp.invalid",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_username,
{ "Owner Username",
"sdp.owner.username",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_sessionid,
{ "Session ID",
"sdp.owner.sessionid",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_version,
{ "Session Version",
"sdp.owner.version",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_network_type,
{ "Owner Network Type",
"sdp.owner.network_type",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_address_type,
{ "Owner Address Type",
"sdp.owner.address_type",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_owner_address,
{ "Owner Address",
"sdp.owner.address",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info_network_type,
{ "Connection Network Type",
"sdp.connection_info.network_type",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info_address_type,
{ "Connection Address Type",
"sdp.connection_info.address_type",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info_connection_address,
{ "Connection Address",
"sdp.connection_info.address",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info_ttl,
{ "Connection TTL",
"sdp.connection_info.ttl",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_connection_info_num_addr,
{ "Connection Number of Addresses",
"sdp.connection_info.num_addr",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bandwidth_modifier,
{ "Bandwidth Modifier",
"sdp.bandwidth.modifier",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bandwidth_value,
{ "Bandwidth Value",
"sdp.bandwidth.value",FT_STRING, BASE_NONE, NULL, 0x0,
"Bandwidth Value (in kbits/s)", HFILL }},
{ &hf_time_start,
{ "Session Start Time",
"sdp.time.start",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_time_stop,
{ "Session Stop Time",
"sdp.time.stop",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_repeat_time_interval,
{ "Repeat Interval",
"sdp.repeat_time.interval",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_repeat_time_duration,
{ "Repeat Duration",
"sdp.repeat_time.duration",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_repeat_time_offset,
{ "Repeat Offset",
"sdp.repeat_time.offset",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_timezone_time,
{ "Timezone Time",
"sdp.timezone.time",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_timezone_offset,
{ "Timezone Offset",
"sdp.timezone.offset",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_encryption_key_type,
{ "Key Type",
"sdp.encryption_key.type",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_encryption_key_data,
{ "Key Data",
"sdp.encryption_key.data",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_session_attribute_field,
{ "Session Attribute Fieldname",
"sdp.session_attr.field",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_session_attribute_value,
{ "Session Attribute Value",
"sdp.session_attr.value",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_media,
{ "Media Type",
"sdp.media.media",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_port,
{ "Media Port",
"sdp.media.port",FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_portcount,
{ "Media Port Count",
"sdp.media.portcount",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_proto,
{ "Media Protocol",
"sdp.media.proto",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_format,
{ "Media Format",
"sdp.media.format",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_attribute_field,
{ "Media Attribute Fieldname",
"sdp.media_attribute.field",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_attribute_value,
{ "Media Attribute Value",
"sdp.media_attribute.value",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_encoding_name,
{ "MIME Type",
"sdp.mime.type",FT_STRING, BASE_NONE, NULL, 0x0,
"SDP MIME Type", HFILL }},
{ &hf_media_sample_rate,
{ "Sample Rate",
"sdp.sample_rate",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_media_format_specific_parameter,
{ "Media format specific parameters",
"sdp.fmtp.parameter",FT_STRING, BASE_NONE, NULL, 0x0,
"Format specific parameter(fmtp)", HFILL }},
{ &hf_ipbcp_version,
{ "IPBCP Protocol Version",
"ipbcp.version",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_ipbcp_type,
{ "IPBCP Command Type",
"ipbcp.command",FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{&hf_sdp_fmtp_mpeg4_profile_level_id,
{ "Level Code",
"sdp.fmtp.profile_level_id",FT_UINT32, BASE_DEC,VALS(mp4ves_level_indication_vals), 0x0,
NULL, HFILL }},
{ &hf_sdp_fmtp_h263_profile,
{ "Profile",
"sdp.fmtp.h263profile",FT_UINT32, BASE_DEC,VALS(h263_profile_vals), 0x0,
NULL, HFILL }},
{ &hf_sdp_fmtp_h263_level,
{ "Level",
"sdp.fmtp.h263level",FT_UINT32, BASE_DEC,VALS(h263_level_vals), 0x0,
NULL, HFILL }},
{ &hf_sdp_h264_packetization_mode,
{ "Packetization mode",
"sdp.fmtp.h264_packetization_mode",FT_UINT32, BASE_DEC,VALS(h264_packetization_mode_vals), 0x0,
NULL, HFILL }},
{ &hf_sdp_h264_sprop_parameter_sets,
{ "Sprop_parameter_sets",
"sdp.h264.sprop_parameter_sets", FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_SDPh223LogicalChannelParameters,
{ "h223LogicalChannelParameters", "sdp.h223LogicalChannelParameters",
FT_NONE, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_key_mgmt_att_value,
{ "Key Management",
"sdp.key_mgmt", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_key_mgmt_prtcl_id,
{ "Key Management Protocol (kmpid)",
"sdp.key_mgmt.kmpid", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_key_mgmt_data,
{ "Key Management Data",
"sdp.key_mgmt.data", FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_sdp,
&ett_sdp_owner,
&ett_sdp_connection_info,
&ett_sdp_bandwidth,
&ett_sdp_time,
&ett_sdp_repeat_time,
&ett_sdp_timezone,
&ett_sdp_encryption_key,
&ett_sdp_session_attribute,
&ett_sdp_media,
&ett_sdp_media_attribute,
&ett_sdp_fmtp,
&ett_sdp_key_mgmt,
};
module_t *sdp_module;
proto_sdp = proto_register_protocol("Session Description Protocol",
"SDP", "sdp");
proto_register_field_array(proto_sdp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
key_mgmt_dissector_table = register_dissector_table("key_mgmt",
"Key Management", FT_STRING, BASE_NONE);
/*
* Preferences registration
*/
sdp_module = prefs_register_protocol(proto_sdp, NULL);
prefs_register_bool_preference(sdp_module, "establish_conversation",
"Establish Media Conversation",
"Specifies that RTP/RTCP/T.38/MSRP/etc streams are decoded based "
"upon port numbers found in SDP payload",
&global_sdp_establish_conversation);
/*
* Register the dissector by name, so other dissectors can
* grab it by name rather than just referring to it directly.
*/
register_dissector("sdp", dissect_sdp, proto_sdp);
/* Register for tapping */
sdp_tap = register_tap("sdp");
}
void
proto_reg_handoff_sdp(void)
{
dissector_handle_t sdp_handle;
rtp_handle = find_dissector("rtp");
rtcp_handle = find_dissector("rtcp");
msrp_handle = find_dissector("msrp");
t38_handle = find_dissector("t38");
h264_handle = find_dissector("h264");
mp4ves_handle = find_dissector("mp4ves");
sdp_handle = find_dissector("sdp");
dissector_add_string("media_type", "application/sdp", sdp_handle);
dissector_add("bctp.tpi", 0x20, sdp_handle);
}
View Git Blame Copy Permalink