2404 lines
81 KiB
C
2404 lines
81 KiB
C
/* packet-sdp.c
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* Routines for SDP packet disassembly (RFC 2327)
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*
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* Jason Lango <jal@netapp.com>
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* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Ref http://www.ietf.org/rfc/rfc4566.txt?number=4566
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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 <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_WINSOCK2_H
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#include <winsock2.h> /* needed to define AF_ values on Windows */
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#endif
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#ifdef NEED_INET_V6DEFS_H
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# include "wsutil/inet_v6defs.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 <epan/strutil.h>
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#include <epan/emem.h>
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#include <epan/base64.h>
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#include <epan/asn1.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/tap.h>
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#include "packet-sdp.h"
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#include "packet-frame.h"
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#include "packet-rtp.h"
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#include <epan/rtp_pt.h>
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#include "packet-rtcp.h"
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#include "packet-t38.h"
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#include "packet-msrp.h"
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#include "packet-sprt.h"
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#include "packet-per.h"
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#include "packet-h245.h"
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#include "packet-h264.h"
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#include "packet-mp4ves.h"
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static dissector_handle_t rtp_handle;
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static dissector_handle_t rtcp_handle;
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static dissector_handle_t t38_handle;
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static dissector_handle_t sprt_handle;
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static dissector_handle_t msrp_handle;
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static dissector_handle_t h264_handle;
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static dissector_handle_t mp4ves_handle;
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static int sdp_tap = -1;
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static int proto_sdp = -1;
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static int proto_sprt = -1;
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/* preference globals */
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static gboolean global_sdp_establish_conversation = TRUE;
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/* Top level fields */
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static int hf_protocol_version = -1;
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static int hf_owner = -1;
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static int hf_session_name = -1;
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static int hf_session_info = -1;
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static int hf_uri = -1;
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static int hf_email = -1;
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static int hf_phone = -1;
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static int hf_connection_info = -1;
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static int hf_bandwidth = -1;
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static int hf_timezone = -1;
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static int hf_encryption_key = -1;
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static int hf_session_attribute = -1;
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static int hf_media_attribute = -1;
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static int hf_time = -1;
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static int hf_repeat_time = -1;
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static int hf_media = -1;
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static int hf_media_title = -1;
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static int hf_unknown = -1;
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static int hf_invalid = -1;
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static int hf_ipbcp_version = -1;
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static int hf_ipbcp_type = -1;
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/* hf_owner subfields*/
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static int hf_owner_username = -1;
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static int hf_owner_sessionid = -1;
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static int hf_owner_version = -1;
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static int hf_owner_network_type = -1;
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static int hf_owner_address_type = -1;
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static int hf_owner_address = -1;
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/* hf_connection_info subfields */
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static int hf_connection_info_network_type = -1;
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static int hf_connection_info_address_type = -1;
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static int hf_connection_info_connection_address = -1;
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static int hf_connection_info_ttl = -1;
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static int hf_connection_info_num_addr = -1;
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/* hf_bandwidth subfields */
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static int hf_bandwidth_modifier = -1;
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static int hf_bandwidth_value = -1;
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/* hf_time subfields */
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static int hf_time_start = -1;
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static int hf_time_stop = -1;
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/* hf_repeat_time subfield */
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static int hf_repeat_time_interval = -1;
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static int hf_repeat_time_duration = -1;
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static int hf_repeat_time_offset = -1;
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/* hf_timezone subfields */
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static int hf_timezone_time = -1;
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static int hf_timezone_offset = -1;
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/* hf_encryption_key subfields */
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static int hf_encryption_key_type = -1;
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static int hf_encryption_key_data = -1;
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/* hf_session_attribute subfields */
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static int hf_session_attribute_field = -1;
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static int hf_session_attribute_value = -1;
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/* hf_media subfields */
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static int hf_media_media = -1;
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static int hf_media_port = -1;
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static int hf_media_portcount = -1;
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static int hf_media_proto = -1;
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static int hf_media_format = -1;
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/* hf_session_attribute subfields */
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static int hf_media_attribute_field = -1;
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static int hf_media_attribute_value = -1;
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static int hf_media_encoding_name = -1;
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static int hf_media_sample_rate = -1;
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static int hf_media_format_specific_parameter = -1;
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static int hf_sdp_fmtp_mpeg4_profile_level_id = -1;
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static int hf_sdp_fmtp_h263_profile = -1;
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static int hf_sdp_fmtp_h263_level = -1;
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static int hf_sdp_h264_packetization_mode = -1;
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static int hf_SDPh223LogicalChannelParameters = -1;
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/* hf_session_attribute hf_media_attribute subfields */
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static int hf_key_mgmt_att_value = -1;
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static int hf_key_mgmt_prtcl_id = -1;
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static int hf_key_mgmt_data = -1;
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static int hf_sdp_crypto_tag = -1;
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static int hf_sdp_crypto_crypto_suite = -1;
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static int hf_sdp_crypto_master_key = -1;
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static int hf_sdp_crypto_master_salt = -1;
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static int hf_sdp_crypto_lifetime = -1;
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static int hf_sdp_crypto_mki = -1;
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static int hf_sdp_crypto_mki_length = -1;
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/* trees */
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static int ett_sdp = -1;
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static int ett_sdp_owner = -1;
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static int ett_sdp_connection_info = -1;
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static int ett_sdp_bandwidth = -1;
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static int ett_sdp_time = -1;
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static int ett_sdp_repeat_time = -1;
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static int ett_sdp_timezone = -1;
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static int ett_sdp_encryption_key = -1;
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static int ett_sdp_session_attribute = -1;
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static int ett_sdp_media = -1;
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static int ett_sdp_media_attribute = -1;
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static int ett_sdp_fmtp = -1;
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static int ett_sdp_key_mgmt = -1;
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static int ett_sdp_crypto_key_parameters = -1;
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#define SDP_MAX_RTP_CHANNELS 4
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#define SDP_MAX_RTP_PAYLOAD_TYPES 20
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#define SDP_NO_OF_PT 128
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typedef struct {
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gint32 pt[SDP_MAX_RTP_PAYLOAD_TYPES];
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gint8 pt_count;
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GHashTable *rtp_dyn_payload;
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} transport_media_pt_t;
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typedef struct {
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char *connection_address;
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char *connection_type;
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char *media_type;
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char *encoding_name[SDP_NO_OF_PT];
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int sample_rate[SDP_NO_OF_PT];
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char *media_port[SDP_MAX_RTP_CHANNELS];
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char *media_proto[SDP_MAX_RTP_CHANNELS];
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transport_media_pt_t media[SDP_MAX_RTP_CHANNELS];
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gint8 media_count;
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/* SRTP related info */
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guint encryption_algorithm;
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guint auth_algorithm;
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guint mki_len; /* number of octets used for the MKI in the RTP payload */
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guint auth_tag_len; /* number of octets used for the Auth Tag in the RTP payload */
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} transport_info_t;
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/* MSRP transport info (as set while parsing path attribute) */
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static gboolean msrp_transport_address_set = FALSE;
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static guint32 msrp_ipaddr[4];
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static guint16 msrp_port_number;
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/* key-mgmt dissector
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* IANA registry:
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* http://www.iana.org/assignments/sdp-parameters
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*/
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static dissector_table_t key_mgmt_dissector_table;
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/* Protocol registration */
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void proto_register_sdp(void);
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void proto_reg_handoff_sdp(void);
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/* static functions */
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static void call_sdp_subdissector(tvbuff_t *tvb, packet_info *pinfo, int hf, proto_tree* ti, int length,
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transport_info_t *transport_info);
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/* Subdissector functions */
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static void dissect_sdp_owner(tvbuff_t *tvb, proto_item* ti);
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static void dissect_sdp_connection_info(tvbuff_t *tvb, proto_item* ti,
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transport_info_t *transport_info);
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static void dissect_sdp_bandwidth(tvbuff_t *tvb, proto_item *ti);
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static void dissect_sdp_time(tvbuff_t *tvb, proto_item* ti);
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static void dissect_sdp_repeat_time(tvbuff_t *tvb, proto_item* ti);
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static void dissect_sdp_timezone(tvbuff_t *tvb, proto_item* ti);
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static void dissect_sdp_encryption_key(tvbuff_t *tvb, proto_item * ti);
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static void dissect_sdp_session_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_item *ti);
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static void dissect_sdp_media(tvbuff_t *tvb, proto_item *ti,
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transport_info_t *transport_info);
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static void dissect_sdp_media_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_item *ti, int length, transport_info_t *transport_info);
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static void free_encoding_name_str (void *ptr)
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{
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encoding_name_and_rate_t *encoding_name_and_rate = (encoding_name_and_rate_t *)ptr;
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if (encoding_name_and_rate->encoding_name) {
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g_free(encoding_name_and_rate->encoding_name);
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}
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}
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static void
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dissect_sdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *sdp_tree;
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proto_item *ti, *sub_ti;
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gint offset = 0;
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gint next_offset;
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int linelen;
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gboolean in_media_description;
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guchar type;
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guchar delim;
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int datalen;
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int tokenoffset;
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int hf = -1;
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char *string;
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address src_addr;
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transport_info_t transport_info;
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guint32 port = 0;
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gboolean is_rtp = FALSE;
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gboolean is_srtp = FALSE;
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gboolean is_t38 = FALSE;
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gboolean is_msrp = FALSE;
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gboolean is_sprt = FALSE;
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gboolean set_rtp = FALSE;
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gboolean is_ipv4_addr = FALSE;
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gboolean is_ipv6_addr = FALSE;
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gboolean is_video = FALSE;
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guint32 ipaddr[4];
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gint n, i;
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guint32 *port_addr;
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sdp_packet_info *sdp_pi;
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gchar *unknown_encoding = ep_strdup("Unknown");
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struct srtp_info *srtp_info = NULL;
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/* Initialise packet info for passing to tap */
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sdp_pi = ep_alloc(sizeof (sdp_packet_info));
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sdp_pi->summary_str[0] = '\0';
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/* Initialise RTP channel info */
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transport_info.connection_address = NULL;
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transport_info.connection_type = NULL;
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transport_info.media_type = NULL;
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/* Initialise SRTP crypto info XXX note currently we only handle one crypto line in the SDP
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* We should probably handle offer/answer and session updates etc(SIP) quite possibly the whole handling of
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* seting up the RTP conversations should be done by the signaling protocol(s) calling the SDP dissector
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* and the SDP dissector just provide the relevant data.
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*/
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transport_info.encryption_algorithm = SRTP_ENC_ALG_NOT_SET;
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transport_info.auth_algorithm = SRTP_AUTH_ALG_NONE;
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transport_info.mki_len = 0; /* number of octets used for the MKI in the RTP payload */
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transport_info.auth_tag_len = 0; /* number of octets used for the Auth Tag in the RTP payload */
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for (n = 0; n < SDP_NO_OF_PT; n++) {
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transport_info.encoding_name[n] = unknown_encoding;
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transport_info.sample_rate[n] = 0;
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}
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for (n = 0; n < SDP_MAX_RTP_CHANNELS; n++)
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{
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transport_info.media_port[n] = NULL;
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transport_info.media_proto[n] = NULL;
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transport_info.media[n].pt_count = 0;
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transport_info.media[n].rtp_dyn_payload =
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g_hash_table_new_full(g_int_hash, g_int_equal, g_free, free_encoding_name_str);
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}
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transport_info.media_count = 0;
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/*
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* As RFC 2327 says, "SDP is purely a format for session
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* description - it does not incorporate a transport protocol,
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* and is intended to use different transport protocols as
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* appropriate including the Session Announcement Protocol,
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* Session Initiation Protocol, Real-Time Streaming Protocol,
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* electronic mail using the MIME extensions, and the
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* Hypertext Transport Protocol."
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*
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* We therefore don't set the protocol or info columns;
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* instead, we append to them, so that we don't erase
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* what the protocol inside which the SDP stuff resides
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* put there.
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*/
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col_append_str(pinfo->cinfo, COL_PROTOCOL, "/SDP");
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/* XXX: Needs description. */
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col_append_str(pinfo->cinfo, COL_INFO, ", with session description");
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ti = proto_tree_add_item(tree, proto_sdp, tvb, offset, -1, ENC_NA);
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sdp_tree = proto_item_add_subtree(ti, ett_sdp);
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/*
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* Show the SDP message a line at a time.
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*/
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in_media_description = FALSE;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
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/*
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* Line must contain at least e.g. "v=".
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*/
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if (linelen < 2)
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break;
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type = tvb_get_guint8(tvb, offset);
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delim = tvb_get_guint8(tvb, offset + 1);
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if (delim != '=') {
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proto_item *ti2 = proto_tree_add_item(sdp_tree, hf_invalid, tvb, offset, linelen, ENC_ASCII|ENC_NA);
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expert_add_info_format(pinfo, ti2, PI_MALFORMED, PI_NOTE,
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"Invalid SDP line (no '=' delimiter)");
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offset = next_offset;
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continue;
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}
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/*
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* Attributes.
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*/
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switch (type) {
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case 'v':
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hf = hf_protocol_version;
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break;
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case 'o':
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hf = hf_owner;
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break;
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case 's':
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hf = hf_session_name;
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break;
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case 'i':
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if (in_media_description) {
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hf = hf_media_title;
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} else {
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hf = hf_session_info;
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}
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break;
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case 'u':
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hf = hf_uri;
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break;
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case 'e':
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hf = hf_email;
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break;
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case 'p':
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hf = hf_phone;
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break;
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case 'c':
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hf = hf_connection_info;
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break;
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case 'b':
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hf = hf_bandwidth;
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break;
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case 't':
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hf = hf_time;
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break;
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case 'r':
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hf = hf_repeat_time;
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break;
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case 'm':
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hf = hf_media;
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in_media_description = TRUE;
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break;
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case 'k':
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hf = hf_encryption_key;
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break;
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case 'a':
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if (in_media_description) {
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hf = hf_media_attribute;
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} else {
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hf = hf_session_attribute;
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}
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break;
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case 'z':
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hf = hf_timezone;
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break;
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default:
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hf = hf_unknown;
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break;
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}
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tokenoffset = 2;
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if (hf == hf_unknown)
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tokenoffset = 0;
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string = (char*)tvb_get_ephemeral_string(tvb, offset + tokenoffset,
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linelen - tokenoffset);
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sub_ti = proto_tree_add_string(sdp_tree, hf, tvb, offset, linelen,
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string);
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call_sdp_subdissector(tvb_new_subset(tvb, offset + tokenoffset,
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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);
|
|
/* Check if media protocol is SPRT */
|
|
is_sprt = ((strcmp(transport_info.media_proto[n],"UDPSPRT") == 0) ||
|
|
(strcmp(transport_info.media_proto[n],"udpsprt") == 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) {
|
|
srtp_info = se_alloc0(sizeof (struct srtp_info));
|
|
if (transport_info.encryption_algorithm != SRTP_ENC_ALG_NOT_SET) {
|
|
srtp_info->encryption_algorithm = transport_info.encryption_algorithm;
|
|
srtp_info->auth_algorithm = transport_info.auth_algorithm;
|
|
srtp_info->mki_len = transport_info.mki_len;
|
|
srtp_info->auth_tag_len = transport_info.auth_tag_len;
|
|
|
|
}
|
|
srtp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num, is_video,
|
|
transport_info.media[n].rtp_dyn_payload, 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;
|
|
/* SPRT might use the same port... */
|
|
port_addr = se_alloc(sizeof(guint32));
|
|
*port_addr = port;
|
|
p_add_proto_data(pinfo->fd, proto_sprt, port_addr);
|
|
}
|
|
if (rtcp_handle) {
|
|
port++;
|
|
if (is_srtp) {
|
|
srtcp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num, srtp_info);
|
|
} else {
|
|
rtcp_add_address(pinfo, &src_addr, port, 0, "SDP", pinfo->fd->num);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* add SPRT conversation */
|
|
if ((!pinfo->fd->flags.visited) && is_sprt && (is_ipv4_addr || is_ipv6_addr)) {
|
|
if (sprt_handle) {
|
|
src_addr.data=(guint8*)&ipaddr;
|
|
if (port == 0) {
|
|
sprt_add_address(pinfo, &src_addr,
|
|
*(guint32*)p_get_proto_data(pinfo->fd, proto_sprt),
|
|
0, "SDP", pinfo->fd->num); /* will use same port as RTP */
|
|
} else {
|
|
sprt_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);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (port != 0) {
|
|
/* 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) {
|
|
if (strlen(sdp_pi->summary_str)) g_strlcat(sdp_pi->summary_str, " ", 50);
|
|
g_strlcat(sdp_pi->summary_str, encoding_name_and_rate_pt->encoding_name, 50);
|
|
} else {
|
|
char num_pt[10];
|
|
g_snprintf(num_pt, 10, "%u", transport_info.media[n].pt[i]);
|
|
if (strlen(sdp_pi->summary_str)) g_strlcat(sdp_pi->summary_str, " ", 50);
|
|
g_strlcat(sdp_pi->summary_str, num_pt, 50);
|
|
}
|
|
} else
|
|
if (strlen(sdp_pi->summary_str)) g_strlcat(sdp_pi->summary_str, " ", 50);
|
|
g_strlcat(sdp_pi->summary_str,
|
|
val_to_str_ext(transport_info.media[n].pt[i], &rtp_payload_type_short_vals_ext, "%u"),
|
|
50);
|
|
}
|
|
}
|
|
|
|
/* 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 ((port != 0) && is_t38) {
|
|
if (strlen(sdp_pi->summary_str)) g_strlcat(sdp_pi->summary_str, " ", 50);
|
|
g_strlcat(sdp_pi->summary_str, "t38", 50);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
offset = next_offset + 1;
|
|
|
|
/* Find the address */
|
|
proto_tree_add_item(sdp_owner_tree, hf_owner_address, tvb, offset, -1, ENC_ASCII|ENC_NA);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
if (next_offset != -1) {
|
|
offset = next_offset + 1;
|
|
proto_tree_add_item(sdp_connection_info_tree,
|
|
hf_connection_info_num_addr, tvb, offset, -1, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
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;
|
|
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
|
|
/* get stop time */
|
|
offset = next_offset + 1;
|
|
proto_tree_add_item(sdp_time_tree, hf_time_stop, tvb, offset, -1, ENC_ASCII|ENC_NA);
|
|
}
|
|
|
|
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;
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
|
|
/* 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, ENC_ASCII|ENC_NA);
|
|
|
|
/* 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, ENC_ASCII|ENC_NA);
|
|
} 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;
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
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;
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
|
|
offset = next_offset + 1;
|
|
proto_tree_add_item(sdp_encryption_key_tree, hf_encryption_key_data,
|
|
tvb, offset, -1, ENC_ASCII|ENC_NA);
|
|
}
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
|
|
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, ENC_NA);
|
|
PROTO_ITEM_SET_HIDDEN(ti2);
|
|
} else {
|
|
proto_tree_add_item(key_tree, hf_key_mgmt_data,
|
|
keymgmt_tvb, 0, -1, ENC_NA);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
|
|
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,"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, ENC_ASCII|ENC_NA);
|
|
|
|
offset = tvb_pbrk_guint8(tvb, offset, -1,"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, ENC_ASCII|ENC_NA);
|
|
} 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, ENC_ASCII|ENC_NA);
|
|
|
|
dissect_key_mgmt(key_tvb, pinfo, key_ti);
|
|
} else {
|
|
proto_tree_add_item(sdp_session_attribute_tree, hf_session_attribute_value,
|
|
tvb, offset, -1, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
|
|
|
|
/* 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;
|
|
|
|
/* 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,
|
|
ENC_ASCII|ENC_NA);
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
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,
|
|
ENC_ASCII|ENC_NA);
|
|
|
|
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_ext(atol((char*)media_format), &rtp_payload_type_vals_ext, "%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, ENC_ASCII|ENC_NA);
|
|
}
|
|
} 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 * volatile data_tvb;
|
|
|
|
end_offset = offset + tokenlen;
|
|
|
|
#if 0
|
|
proto_tree_add_text(tree, tvb, offset, tokenlen, "Debug; Analysed string: '%s'",
|
|
tvb_get_ephemeral_string(tvb, offset, tokenlen));
|
|
#endif
|
|
|
|
/* 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);
|
|
#if 0
|
|
proto_tree_add_text(tree, tvb, offset, tokenlen, "Debug; MIMEtype '%s'Parameter name: '%s'", mime_type, field_name); */
|
|
#endif
|
|
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 = 0;
|
|
|
|
/* 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);
|
|
if (!data_tvb) {
|
|
proto_tree_add_text(tree, tvb, offset, tokenlen, "Could not convert '%s' to 3 bytes", format_specific_parameter);
|
|
return;
|
|
}
|
|
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) {
|
|
TRY {
|
|
dissect_h264_nal_unit(data_tvb, pinfo, tree);
|
|
}
|
|
CATCH(BoundsError) {
|
|
RETHROW;
|
|
}
|
|
CATCH(ReportedBoundsError) {
|
|
show_reported_bounds_error(tvb, pinfo, tree);
|
|
}
|
|
ENDTRY;
|
|
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
|
|
#define SDP_CRYPTO 5
|
|
#define SDP_SPRTMAP 6
|
|
|
|
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 */
|
|
{ "crypto"}, /* 5 */
|
|
{ "sprt"}, /* 6 */
|
|
};
|
|
|
|
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, *parameter_item;
|
|
proto_item *fmtp_item, *media_format_item, *parameter_tree;
|
|
proto_tree *fmtp_tree;
|
|
gint offset, next_offset, tokenlen, n, colon_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;
|
|
guint8 master_key_length = 0, master_salt_length = 0;
|
|
encoding_name_and_rate_t *encoding_name_and_rate;
|
|
|
|
offset = 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, ENC_ASCII|ENC_NA);
|
|
/*??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, ENC_ASCII|ENC_NA);
|
|
|
|
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;
|
|
|
|
proto_tree_add_item(sdp_media_attribute_tree, hf_media_encoding_name, tvb,
|
|
offset, tokenlen, ENC_ASCII|ENC_NA);
|
|
|
|
pt = atoi((char*)payload_type);
|
|
if (pt >= SDP_NO_OF_PT) {
|
|
return; /* Invalid */
|
|
}
|
|
|
|
key = g_malloc(sizeof (gint));
|
|
*key = atol((char*)payload_type);
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
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, ENC_ASCII|ENC_NA);
|
|
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]);
|
|
|
|
#if 0 /* XXX: ?? */
|
|
payload_type = tvb_get_ephemeral_string(tvb, offset, tokenlen);
|
|
#endif
|
|
/* 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);
|
|
}
|
|
|
|
/* 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, ENC_ASCII|ENC_NA);
|
|
|
|
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 */
|
|
/* RFC 4975
|
|
* path = path-label ":" path-list
|
|
* path-label = "path"
|
|
* path-list= MSRP-URI *(SP MSRP-URI)
|
|
* MSRP-URI = msrp-scheme "://" authority
|
|
* ["/" session-id] ";" transport *( ";" URI-parameter)
|
|
* ; authority as defined in RFC3986
|
|
*
|
|
* msrp-scheme = "msrp" / "msrps"
|
|
* RFC 3986
|
|
* The authority component is preceded by a double slash ("//") and is terminated by
|
|
* the next slash ("/"), question mark ("?"), or number sign ("#") character, or by
|
|
* the end of the URI.
|
|
*/
|
|
|
|
/* Check for "msrp://" */
|
|
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;
|
|
case SDP_CRYPTO:
|
|
/* http://tools.ietf.org/html/rfc4568
|
|
* 9.1. Generic "Crypto" Attribute Grammar
|
|
*
|
|
* The ABNF grammar for the crypto attribute is defined below:
|
|
*
|
|
* "a=crypto:" tag 1*WSP crypto-suite 1*WSP key-params
|
|
* *(1*WSP session-param)
|
|
*
|
|
* tag = 1*9DIGIT
|
|
* crypto-suite = 1*(ALPHA / DIGIT / "_")
|
|
*
|
|
* key-params = key-param *(";" key-param)
|
|
* key-param = key-method ":" key-info
|
|
* key-method = "inline" / key-method-ext
|
|
* key-method-ext = 1*(ALPHA / DIGIT / "_")
|
|
* key-info = 1*(%x21-3A / %x3C-7E) ; visible (printing) chars
|
|
* ; except semi-colon
|
|
* session-param = 1*(VCHAR) ; visible (printing) characters
|
|
*
|
|
* where WSP, ALPHA, DIGIT, and VCHAR are defined in [RFC4234].
|
|
*
|
|
*/
|
|
|
|
/* We are at the first colon */
|
|
/* tag */
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, ' ');
|
|
tokenlen = next_offset - offset;
|
|
proto_tree_add_uint(sdp_media_attribute_tree, hf_sdp_crypto_tag, tvb, offset, tokenlen,
|
|
atoi((char*)tvb_get_ephemeral_string(tvb, offset, tokenlen)));
|
|
offset = next_offset + 1;
|
|
|
|
/* crypto-suite */
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, ' ');
|
|
tokenlen = next_offset - offset;
|
|
proto_tree_add_item(sdp_media_attribute_tree, hf_sdp_crypto_crypto_suite,
|
|
tvb, offset, tokenlen, ENC_ASCII|ENC_NA);
|
|
if (tvb_strncaseeql(tvb, offset, "AES_CM_128_HMAC_SHA1_80", tokenlen) == 0) {
|
|
|
|
/* XXX This may only work in simple cases */
|
|
if (transport_info->encryption_algorithm == SRTP_ENC_ALG_NOT_SET) {
|
|
transport_info->encryption_algorithm = SRTP_ENC_ALG_AES_CM;
|
|
transport_info->auth_algorithm = SRTP_AUTH_ALG_HMAC_SHA1;
|
|
/* number of octets used for the Auth Tag in the RTP payload */
|
|
transport_info->auth_tag_len = 10;
|
|
}
|
|
master_key_length = 16; /* 128 bits = 16 octets */
|
|
master_salt_length = 14; /* 112 bits = 14 octets */
|
|
} else if (tvb_strncaseeql(tvb, offset, "AES_CM_128_HMAC_SHA1_32", tokenlen) == 0) {
|
|
/* XXX This may only work in simple cases */
|
|
if (transport_info->encryption_algorithm == SRTP_ENC_ALG_NOT_SET) {
|
|
transport_info->encryption_algorithm = SRTP_ENC_ALG_AES_CM;
|
|
transport_info->auth_algorithm = SRTP_AUTH_ALG_HMAC_SHA1;
|
|
/* number of octets used for the Auth Tag in the RTP payload */
|
|
transport_info->auth_tag_len = 4;
|
|
}
|
|
master_key_length = 16; /* 128 bits = 16 octets */
|
|
master_salt_length = 14; /* 112 bits = 14 octets */
|
|
} else if (tvb_strncaseeql(tvb, offset, "F8_128_HMAC_SHA1_80", tokenlen) == 0) {
|
|
if (transport_info->encryption_algorithm == SRTP_ENC_ALG_NOT_SET) {
|
|
/* XXX This may only work in simple cases */
|
|
transport_info->encryption_algorithm = SRTP_ENC_ALG_AES_F8;
|
|
transport_info->auth_algorithm = SRTP_AUTH_ALG_HMAC_SHA1;
|
|
/* number of octets used for the Auth Tag in the RTP payload */
|
|
transport_info->auth_tag_len = 10;
|
|
}
|
|
master_key_length = 16; /* 128 bits = 16 octets */
|
|
master_salt_length = 14; /* 112 bits = 14 octets */
|
|
}
|
|
offset = next_offset + 1;
|
|
|
|
/* key-params */
|
|
while (has_more_pars == TRUE) {
|
|
int param_end_offset;
|
|
tvbuff_t *key_salt_tvb;
|
|
gchar *data_p = NULL;
|
|
|
|
param_end_offset = tvb_find_guint8(tvb, offset, -1, ';');
|
|
if (param_end_offset == -1) {
|
|
has_more_pars = FALSE;
|
|
param_end_offset = tvb_length(tvb);
|
|
}
|
|
parameter_item = proto_tree_add_text(sdp_media_attribute_tree,
|
|
tvb, offset, param_end_offset-offset, "Key parameters");
|
|
parameter_tree = proto_item_add_subtree(parameter_item, ett_sdp_crypto_key_parameters);
|
|
|
|
/* key-method or key-method-ext */
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, ':');
|
|
if (next_offset == -1) {
|
|
expert_add_info_format(pinfo, parameter_item, PI_MALFORMED, PI_NOTE,
|
|
"Invalid key-param (no ':' delimiter)");
|
|
break;
|
|
}
|
|
if (tvb_strncaseeql(tvb, offset, "inline", next_offset-offset) == 0) {
|
|
/* XXX only for SRTP? */
|
|
/* srtp-key-info = key-salt ["|" lifetime] ["|" mki] */
|
|
offset = next_offset +1;
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, '|');
|
|
if (next_offset == -1) {
|
|
tokenlen = param_end_offset - offset;
|
|
} else {
|
|
tokenlen = next_offset - offset;
|
|
}
|
|
data_p = tvb_get_ephemeral_string(tvb, offset, tokenlen);
|
|
key_salt_tvb = base64_to_tvb(tvb, data_p);
|
|
add_new_data_source(pinfo, key_salt_tvb, "Key_Salt_tvb");
|
|
if (master_key_length != 0) {
|
|
proto_tree_add_text(parameter_tree, tvb, offset, tokenlen, "Key and Salt");
|
|
proto_tree_add_item(parameter_tree, hf_sdp_crypto_master_key,
|
|
key_salt_tvb, 0, master_key_length, ENC_ASCII|ENC_NA);
|
|
proto_tree_add_item(parameter_tree, hf_sdp_crypto_master_salt,
|
|
key_salt_tvb, master_key_length, master_salt_length, ENC_ASCII|ENC_NA);
|
|
} else {
|
|
proto_tree_add_text(parameter_tree, key_salt_tvb, 0, -1, "Key and Salt");
|
|
}
|
|
|
|
/* ["|" lifetime] ["|" mki] are optional */
|
|
if (next_offset != -1) {
|
|
offset = next_offset + 1;
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, '|');
|
|
if (next_offset != -1) {
|
|
/*lifetime = ["2^"] 1*(DIGIT) ; see section 6.1 for "2^" */
|
|
tokenlen = next_offset - offset;
|
|
proto_tree_add_item(parameter_tree, hf_sdp_crypto_lifetime,
|
|
tvb, offset, tokenlen, ENC_ASCII|ENC_NA);
|
|
offset = next_offset + 1;
|
|
}
|
|
/* mki = mki-value ":" mki-length
|
|
*
|
|
* mki-value = 1*DIGIT
|
|
*/
|
|
next_offset = tvb_find_guint8(tvb, offset, -1, ':');
|
|
tokenlen = next_offset - offset;
|
|
proto_tree_add_item(parameter_tree, hf_sdp_crypto_mki, tvb, offset, tokenlen, ENC_ASCII|ENC_NA);
|
|
offset = next_offset + 1;
|
|
|
|
/* mki-length = 1*3DIGIT ; range 1..128. */
|
|
next_offset = param_end_offset;
|
|
tokenlen = next_offset - offset;
|
|
|
|
/* This will not work if more than one parameter */
|
|
/* number of octets used for the MKI in the RTP payload */
|
|
transport_info->mki_len = atoi((char*)tvb_get_ephemeral_string(tvb, offset, tokenlen));
|
|
proto_tree_add_item(parameter_tree, hf_sdp_crypto_mki_length,
|
|
tvb, offset, tokenlen, ENC_ASCII|ENC_NA);
|
|
}
|
|
offset = param_end_offset;
|
|
} else {
|
|
tokenlen = param_end_offset - next_offset + 1;
|
|
proto_tree_add_text(parameter_tree, tvb, next_offset + 1, tokenlen,
|
|
"%s", tvb_get_ephemeral_string(tvb, next_offset + 1, tokenlen));
|
|
offset = param_end_offset;
|
|
}
|
|
}
|
|
|
|
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, ENC_ASCII|ENC_NA);
|
|
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", "sdp.ipbcp.version",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_ipbcp_type,
|
|
{ "IPBCP Command Type", "sdp.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_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 }
|
|
},
|
|
{ &hf_sdp_crypto_tag,
|
|
{ "tag", "sdp.crypto.tag",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_crypto_suite,
|
|
{ "Crypto suite", "sdp.crypto.crypto_suite",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_master_key,
|
|
{ "Master Key", "sdp.crypto.master_key",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_master_salt,
|
|
{ "Mater salt", "sdp.crypto.master_salt",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_lifetime,
|
|
{ "Lifetime", "sdp.crypto.lifetime",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_mki,
|
|
{ "mki-value", "sdp.crypto.mki-valu",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_sdp_crypto_mki_length,
|
|
{ "mki_length", "sdp.crypto.mki_length",
|
|
FT_STRING, 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,
|
|
&ett_sdp_crypto_key_parameters,
|
|
};
|
|
|
|
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");
|
|
sprt_handle = find_dissector("sprt");
|
|
h264_handle = find_dissector("h264");
|
|
mp4ves_handle = find_dissector("mp4ves");
|
|
|
|
proto_sprt = dissector_handle_get_protocol_index(find_dissector("sprt"));
|
|
|
|
sdp_handle = find_dissector("sdp");
|
|
dissector_add_string("media_type", "application/sdp", sdp_handle);
|
|
dissector_add_uint("bctp.tpi", 0x20, sdp_handle);
|
|
}
|