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wireshark/epan/dissectors/packet-sdp.c

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/* packet-sdp.c
* Routines for SDP packet disassembly (RFC 2327)
*
* Jason Lango <jal@netapp.com>
* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Ref http://www.ietf.org/rfc/rfc4566.txt?number=4566
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/exceptions.h>
#include <epan/asn1.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/tap.h>
#include <epan/rtp_pt.h>
#include <epan/show_exception.h>
#include <epan/addr_resolv.h>
#include "packet-sdp.h"
/* un-comment the following as well as this line in conversation.c, to enable debug printing */
/* #define DEBUG_CONVERSATION */
#include "conversation_debug.h"
#include "packet-rtp.h"
#include "packet-rtcp.h"
#include "packet-t38.h"
#include "packet-msrp.h"
#include "packet-sprt.h"
#include "packet-h245.h"
#include "packet-h264.h"
#include "packet-mp4ves.h"
void proto_register_sdp(void);
void proto_reg_handoff_sdp(void);
static dissector_handle_t rtcp_handle;
static dissector_handle_t sprt_handle;
static dissector_handle_t msrp_handle;
static dissector_handle_t h264_handle;
static dissector_handle_t mp4ves_handle;
static int sdp_tap = -1;
static int proto_sdp = -1;
static int proto_sprt = -1;
static const char* UNKNOWN_ENCODING = "Unknown";
static wmem_tree_t *sdp_transport_reqs = NULL;
static wmem_tree_t *sdp_transport_rsps = NULL;
/* preference globals */
static gboolean global_sdp_establish_conversation = TRUE;
/* Top level fields */
static int hf_protocol_version = -1;
static int hf_owner = -1;
static int hf_session_name = -1;
static int hf_session_info = -1;
static int hf_uri = -1;
static int hf_email = -1;
static int hf_phone = -1;
static int hf_connection_info = -1;
static int hf_bandwidth = -1;
static int hf_timezone = -1;
static int hf_encryption_key = -1;
static int hf_session_attribute = -1;
static int hf_media_attribute = -1;
static int hf_time = -1;
static int hf_repeat_time = -1;
static int hf_media = -1;
static int hf_media_title = -1;
static int hf_unknown = -1;
static int hf_invalid = -1;
static int hf_ipbcp_version = -1;
static int hf_ipbcp_type = -1;
/* hf_owner subfields*/
static int hf_owner_username = -1;
static int hf_owner_sessionid = -1;
static int hf_owner_version = -1;
static int hf_owner_network_type = -1;
static int hf_owner_address_type = -1;
static int hf_owner_address = -1;
/* hf_connection_info subfields */
static int hf_connection_info_network_type = -1;
static int hf_connection_info_address_type = -1;
static int hf_connection_info_connection_address = -1;
static int hf_connection_info_ttl = -1;
static int hf_connection_info_num_addr = -1;
/* hf_bandwidth subfields */
static int hf_bandwidth_modifier = -1;
static int hf_bandwidth_value = -1;
/* hf_time subfields */
static int hf_time_start = -1;
static int hf_time_stop = -1;
/* hf_repeat_time subfield */
static int hf_repeat_time_interval = -1;
static int hf_repeat_time_duration = -1;
static int hf_repeat_time_offset = -1;
/* hf_timezone subfields */
static int hf_timezone_time = -1;
static int hf_timezone_offset = -1;
/* hf_encryption_key subfields */
static int hf_encryption_key_type = -1;
static int hf_encryption_key_data = -1;
/* hf_session_attribute subfields */
static int hf_session_attribute_field = -1;
static int hf_session_attribute_value = -1;
/* hf_media subfields */
static int hf_media_media = -1;
static int hf_media_port = -1;
static int hf_media_port_string = -1;
static int hf_media_portcount = -1;
static int hf_media_proto = -1;
static int hf_media_format = -1;
/* hf_session_attribute subfields */
static int hf_media_attribute_field = -1;
static int hf_media_attribute_value = -1;
static int hf_media_encoding_name = -1;
static int hf_media_sample_rate = -1;
static int hf_media_format_specific_parameter = -1;
static int hf_sdp_fmtp_mpeg4_profile_level_id = -1;
static int hf_sdp_fmtp_h263_profile = -1;
static int hf_sdp_fmtp_h263_level = -1;
static int hf_sdp_h264_packetization_mode = -1;
static int hf_SDPh223LogicalChannelParameters = -1;
/* hf_session_attribute hf_media_attribute subfields */
static int hf_key_mgmt_att_value = -1;
static int hf_key_mgmt_prtcl_id = -1;
static int hf_key_mgmt_data = -1;
static int hf_sdp_crypto_tag = -1;
static int hf_sdp_crypto_crypto_suite = -1;
static int hf_sdp_crypto_master_key = -1;
static int hf_sdp_crypto_master_salt = -1;
static int hf_sdp_crypto_lifetime = -1;
static int hf_sdp_crypto_mki = -1;
static int hf_sdp_crypto_mki_length = -1;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_sdp_nal_unit_2_string = -1;
static int hf_sdp_key_and_salt = -1;
static int hf_sdp_nal_unit_1_string = -1;
static int hf_sdp_data = -1;
/* trees */
static int ett_sdp = -1;
static int ett_sdp_owner = -1;
static int ett_sdp_connection_info = -1;
static int ett_sdp_bandwidth = -1;
static int ett_sdp_time = -1;
static int ett_sdp_repeat_time = -1;
static int ett_sdp_timezone = -1;
static int ett_sdp_encryption_key = -1;
static int ett_sdp_session_attribute = -1;
static int ett_sdp_media = -1;
static int ett_sdp_media_attribute = -1;
static int ett_sdp_fmtp = -1;
static int ett_sdp_key_mgmt = -1;
static int ett_sdp_crypto_key_parameters = -1;
static expert_field ei_sdp_invalid_key_param = EI_INIT;
static expert_field ei_sdp_invalid_line_equal = EI_INIT;
static expert_field ei_sdp_invalid_line_fields = EI_INIT;
static expert_field ei_sdp_invalid_line_space = EI_INIT;
static expert_field ei_sdp_invalid_conversion = EI_INIT;
/* patterns used for tvb_pbrk_pattern_guint8 */
static tvb_pbrk_pattern pbrk_digits = INIT_PBRK_PATTERN;
static tvb_pbrk_pattern pbrk_alpha = INIT_PBRK_PATTERN;
#define SDP_RTP_PROTO 0x00000001
#define SDP_SRTP_PROTO 0x00000002
#define SDP_T38_PROTO 0x00000004
#define SDP_MSRP_PROTO 0x00000008
#define SDP_SPRT_PROTO 0x00000010
#define SDP_IPv4 0x80000000
#define SDP_IPv6 0x40000000
#define SDP_MSRP_IPv4 0x20000000
#define SDP_VIDEO 0x10000000
#define SDP_MAX_RTP_CHANNELS 4
#define SDP_MAX_RTP_PAYLOAD_TYPES 20
#define SDP_NO_OF_PT 128
typedef struct {
gint32 pt[SDP_MAX_RTP_PAYLOAD_TYPES];
gint8 pt_count;
rtp_dyn_payload_t *rtp_dyn_payload;
gboolean set_rtp;
} transport_media_pt_t;
typedef struct {
enum sdp_exchange_type sdp_status;
char *encoding_name[SDP_NO_OF_PT];
int sample_rate[SDP_NO_OF_PT];
int media_port[SDP_MAX_RTP_CHANNELS];
address src_addr[SDP_MAX_RTP_CHANNELS];
guint proto_bitmask[SDP_MAX_RTP_CHANNELS];
transport_media_pt_t media[SDP_MAX_RTP_CHANNELS];
gint8 media_count;
/* SRTP related info XXX note currently we only handle one crypto line in the SDP
* We should probably handle offer/answer and session updates etc(SIP) quite possibly the whole handling of
* seting up the RTP conversations should be done by the signaling protocol(s) calling the SDP dissector
* and the SDP dissector just provide the relevant data.
* YES! packet-sdp.c should be about SDP parsing... SDP *state* needs to be maintained by upper
* protocols, because each one has different rules/semantics.
*/
guint encryption_algorithm;
guint auth_algorithm;
guint mki_len; /* number of octets used for the MKI in the RTP payload */
guint auth_tag_len; /* number of octets used for the Auth Tag in the RTP payload */
} transport_info_t;
/* Data that is retrieved from a packet, but does not need to be kept */
typedef struct {
char *connection_address; /* there should actually be SDP_MAX_RTP_CHANNELS of these too */
char *connection_type;
/* media_type is for 'audio', 'video', etc, so per-stream */
char *media_type[SDP_MAX_RTP_CHANNELS];
char *media_port[SDP_MAX_RTP_CHANNELS];
char *media_proto[SDP_MAX_RTP_CHANNELS];
guint8 media_count;
/* MSRP transport info (as set while parsing path attribute) */
gboolean msrp_transport_address_set;
guint32 msrp_ipaddr[4];
guint16 msrp_port_number;
} disposable_media_info_t;
/* here lie the debugging dumper functions */
#ifdef DEBUG_CONVERSATION
static void sdp_dump_transport_media(const transport_media_pt_t* media) {
int i;
int count;
DPRINT2(("transport_media contents:"));
DINDENT();
if (!media) {
DPRINT2(("null transport_media_pt_t*"));
DENDENT();
return;
}
count = (int)media->pt_count;
DPRINT2(("pt_count=%d",count));
DINDENT();
for (i=0; i < count; i++) {
DPRINT2(("pt=%d", media->pt[i]));
}
DENDENT();
DPRINT2(("rtp_dyn_payload hashtable=%s", media->rtp_dyn_payload ? "YES" : "NO"));
if (media->rtp_dyn_payload) {
rtp_dump_dyn_payload(media->rtp_dyn_payload);
}
DPRINT2(("set_rtp=%s", media->set_rtp ? "TRUE" : "FALSE"));
DENDENT();
}
static const value_string sdp_exchange_type_vs[] = {
{ SDP_EXCHANGE_OFFER, "SDP_EXCHANGE_OFFER" },
{ SDP_EXCHANGE_ANSWER_ACCEPT, "SDP_EXCHANGE_ANSWER_ACCEPT" },
{ SDP_EXCHANGE_ANSWER_REJECT, "SDP_EXCHANGE_ANSWER_REJECT" },
{ 0, NULL }
};
static void sdp_dump_transport_info(const transport_info_t* info) {
int i;
int count;
DPRINT2(("transport_info contents:"));
DINDENT();
if (!info) {
DPRINT2(("null transport_info_t*"));
DENDENT();
return;
}
DPRINT2(("sdp_status=%s",
val_to_str(info->sdp_status, sdp_exchange_type_vs, "SDP_EXCHANGE_UNKNOWN")));
DPRINT2(("payload type contents:"));
DINDENT();
for (i=0; i < SDP_NO_OF_PT; i++) {
/* don't print out unknown encodings */
if (info->encoding_name[i] &&
strcmp(UNKNOWN_ENCODING,info->encoding_name[i]) != 0) {
DPRINT2(("payload type #%d:",i));
DINDENT();
DPRINT2(("encoding_name=%s", info->encoding_name[i]));
DPRINT2(("sample_rate=%d", info->sample_rate[i]));
DENDENT();
}
}
DENDENT();
count = (int)info->media_count;
DPRINT2(("media_count=%d", count));
DPRINT2(("rtp channels:"));
DINDENT();
for (i=0; i <= count; i++) {
DPRINT2(("channel #%d:",i));
DINDENT();
DPRINT2(("src_addr=%s",
address_to_str(wmem_packet_scope(), &(info->src_addr[i]))));
DPRINT2(("media_port=%d", info->media_port[i]));
DPRINT2(("proto_bitmask=%x", info->proto_bitmask[i]));
sdp_dump_transport_media(&(info->media[i]));
DENDENT();
}
DENDENT();
DPRINT2(("encryption_algorithm=%u", info->encryption_algorithm));
DPRINT2(("auth_algorithm=%u", info->auth_algorithm));
if (info->encryption_algorithm || info->auth_algorithm) {
DPRINT2(("mki_len=%u", info->mki_len));
if (info->auth_algorithm) {
DPRINT2(("auth_tag_len=%u", info->auth_tag_len));
}
}
DENDENT();
}
static void sdp_dump_disposable_media_info(const disposable_media_info_t* info) {
int i;
int count;
DPRINT2(("disposable_media_info contents:"));
DINDENT();
if (!info) {
DPRINT2(("null disposable_media_info_t*"));
DENDENT();
return;
}
DPRINT2(("connection_address=%s",
info->connection_address ? info->connection_address : "NULL"));
DPRINT2(("connection_type=%s",
info->connection_type ? info->connection_type : "NULL"));
count = (int)info->media_count;
DPRINT2(("media_count=%d",count));
DINDENT();
for (i=0; i < count; i++) {
DPRINT2(("media #%d:",i));
DINDENT();
DPRINT2(("media_type=%s", info->media_type[i] ? info->media_type[i] : "NULL"));
DPRINT2(("media_port=%s", info->media_port[i] ? info->media_port[i] : "NULL"));
DPRINT2(("media_proto=%s", info->media_proto[i] ? info->media_proto[i] : "NULL"));
DENDENT();
}
DENDENT();
DPRINT2(("msrp_transport_address_set=%s",
info->msrp_transport_address_set ? "TRUE" : "FALSE"));
if (info->msrp_transport_address_set) {
DINDENT();
DPRINT2(("msrp_ipaddr=%u.%u.%u.%u",
info->msrp_ipaddr[0],info->msrp_ipaddr[1],
info->msrp_ipaddr[2],info->msrp_ipaddr[3]));
DPRINT2(("msrp_port_number=%hu",info->msrp_port_number));
DENDENT();
}
DENDENT();
}
#endif /* DEBUG_CONVERSATION */
/* key-mgmt dissector
* IANA registry:
* http://www.iana.org/assignments/sdp-parameters
*/
static dissector_table_t key_mgmt_dissector_table;
/* Finds next token (sequence of non-space chars) in tvb from given offset.
* The returned value is the token length, or 0 if none found.
* The offset is changed to be the starting offset, in case there were one or more
* spaces at the beginning. (this will also add expert info in such a case)
* The next_offset is set to the next found space after the token, or -1 if the
* end of line is hit or no token found.
* If this is the last token in the line, tokenlen will not be 0, but next_offset
* will be -1.
*
* The optional param, if TRUE, means no expert error will be issued if no token
* is found; if FALSE then a expert error will be issued if no token is found.
*
* This function expects to be given a tvb of only one line, and does no error
* checking of its given arguments.
*/
static inline gint
find_next_optional_token_in_line(tvbuff_t *tvb, proto_tree *tree,
gint *offset, gint *next_offset,
const gboolean optional)
{
gint tokenlen = 0;
gint next_off = -1;
gint off = *offset;
if (tvb_offset_exists(tvb, off)) {
while (tokenlen == 0) {
next_off = tvb_find_guint8(tvb, off, -1, ' ');
if (next_off == -1) {
tokenlen = tvb_captured_length_remaining(tvb, off);
break; /* Nothing more left */
}
tokenlen = next_off - off;
if (tokenlen == 0) {
/* two spaces in a row - illegal, but we'll keep dissecting */
proto_tree_add_expert(tree, NULL, &ei_sdp_invalid_line_space, tvb, off-1, 2);
off = next_off + 1;
}
}
}
if (!optional && tokenlen == 0) {
proto_tree_add_expert(tree, NULL, &ei_sdp_invalid_line_fields, tvb, 0, -1);
}
*next_offset = next_off;
*offset = off;
return tokenlen;
}
/* Same as above, but always issues an expert error if a token is not found. */
static inline gint
find_next_token_in_line(tvbuff_t *tvb, proto_tree *tree, gint *offset, gint *next_offset)
{
return find_next_optional_token_in_line(tvb, tree, offset, next_offset, FALSE);
}
/* Subdissector functions */
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 */
tokenlen = find_next_token_in_line(tvb, sdp_owner_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_owner_tree, hf_owner_username, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the session id */
tokenlen = find_next_token_in_line(tvb, sdp_owner_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_owner_tree, hf_owner_sessionid, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the version */
tokenlen = find_next_token_in_line(tvb, sdp_owner_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_owner_tree, hf_owner_version, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the network type */
tokenlen = find_next_token_in_line(tvb, sdp_owner_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_owner_tree, hf_owner_network_type, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the address type */
tokenlen = find_next_token_in_line(tvb, sdp_owner_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_owner_tree, hf_owner_address_type, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the address */
proto_tree_add_item(sdp_owner_tree, hf_owner_address, tvb, offset, -1, ENC_UTF_8|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,
disposable_media_info_t *media_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 */
tokenlen = find_next_token_in_line(tvb, sdp_connection_info_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_network_type, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
/* Find the address type */
tokenlen = find_next_token_in_line(tvb, sdp_connection_info_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
/* Save connection address type */
media_info->connection_type = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
DPRINT(("parsed connection line type=%s", media_info->connection_type));
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_address_type, tvb, offset, tokenlen,
ENC_UTF_8|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 */
media_info->connection_address =
(char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tvb_length_remaining(tvb, offset), ENC_UTF_8|ENC_NA);
} else {
tokenlen = next_offset - offset;
/* Save connection address */
media_info->connection_address = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
}
DPRINT(("parsed connection line address=%s", media_info->connection_address));
proto_tree_add_item(sdp_connection_info_tree,
hf_connection_info_connection_address, tvb, offset,
tokenlen, ENC_UTF_8|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_UTF_8|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_UTF_8|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_UTF_8|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_UTF_8|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 */
tokenlen = find_next_token_in_line(tvb, sdp_time_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_time_tree, hf_time_start, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
/* get stop time */
offset = next_offset + 1;
proto_tree_add_item(sdp_time_tree, hf_time_stop, tvb, offset, -1, ENC_UTF_8|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;
gboolean optional = FALSE;
offset = 0;
sdp_repeat_time_tree = proto_item_add_subtree(ti, ett_sdp_time);
/* get interval */
tokenlen = find_next_token_in_line(tvb, sdp_repeat_time_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_repeat_time_tree, hf_repeat_time_interval, tvb,
offset, tokenlen, ENC_UTF_8|ENC_NA);
/* get duration */
offset = next_offset + 1;
tokenlen = find_next_token_in_line(tvb, sdp_repeat_time_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_repeat_time_tree, hf_repeat_time_duration, tvb,
offset, tokenlen, ENC_UTF_8|ENC_NA);
/* get offsets */
do {
offset = next_offset +1;
tokenlen = find_next_optional_token_in_line(tvb, sdp_repeat_time_tree,
&offset, &next_offset, optional);
if (tokenlen == 0)
break;
proto_tree_add_item(sdp_repeat_time_tree, hf_repeat_time_offset,
tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
optional = TRUE;
} 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;
gboolean optional = FALSE;
offset = 0;
sdp_timezone_tree = proto_item_add_subtree(ti, ett_sdp_timezone);
do {
tokenlen = find_next_optional_token_in_line(tvb, sdp_timezone_tree,
&offset, &next_offset, optional);
if (tokenlen == 0)
break;
proto_tree_add_item(sdp_timezone_tree, hf_timezone_time, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
tokenlen = find_next_optional_token_in_line(tvb, sdp_timezone_tree,
&offset, &next_offset, optional);
if (tokenlen == 0)
break;
proto_tree_add_item(sdp_timezone_tree, hf_timezone_offset, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
optional = TRUE;
} 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_UTF_8|ENC_NA);
offset = next_offset + 1;
proto_tree_add_item(sdp_encryption_key_tree, hf_encryption_key_data,
tvb, offset, -1, ENC_UTF_8|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;
int found_match = 0;
proto_tree *key_tree;
gint next_offset;
gint offset = 0;
gint tokenlen;
key_tree = proto_item_add_subtree(ti, ett_sdp_key_mgmt);
tokenlen = find_next_token_in_line(tvb, key_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
prtcl_id = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
proto_tree_add_item(key_tree, hf_key_mgmt_prtcl_id, tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
len = tvb_length_remaining(tvb, offset);
if (len < 0)
return;
data_p = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, len, ENC_UTF_8|ENC_NA);
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, NULL);
}
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_UTF_8|ENC_NA);
field_name = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
if (strcmp((char*)field_name, "ipbcp") == 0) {
offset = tvb_pbrk_pattern_guint8(tvb, offset, -1,&pbrk_digits, NULL);
if (offset == -1)
return;
tokenlen = find_next_token_in_line(tvb, sdp_session_attribute_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_item(sdp_session_attribute_tree, hf_ipbcp_version, tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
offset = tvb_pbrk_pattern_guint8(tvb, offset, -1,&pbrk_alpha, 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_UTF_8|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_UTF_8|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_UTF_8|ENC_NA);
}
}
/* Dissect media description - this is passed the line starting after 'm=', so like one of these:
* audio 29156 RTP/AVP 18 0
* video 49170/2 RTP/AVP 31 99
*/
static void
dissect_sdp_media(tvbuff_t *tvb, proto_item *ti,
transport_info_t *transport_info, disposable_media_info_t *media_info) {
proto_tree *sdp_media_tree;
gint offset, next_offset, tokenlen, idx;
guint8 *media_format;
gboolean optional = FALSE;
proto_item *it;
offset = 0;
/* Create tree for media session */
sdp_media_tree = proto_item_add_subtree(ti, ett_sdp_media);
tokenlen = find_next_token_in_line(tvb, sdp_media_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
/* Type of media session */
proto_tree_add_item(sdp_media_tree, hf_media_media, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
media_info->media_type[media_info->media_count] = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
DPRINT(("parsed media_type=%s, for media_count=%d",
media_info->media_type[media_info->media_count],
media_info->media_count));
offset = next_offset + 1;
tokenlen = find_next_token_in_line(tvb, sdp_media_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
next_offset = tvb_find_guint8(tvb, offset, tokenlen, '/');
if (next_offset != -1) {
tokenlen = next_offset - offset;
/* Save port info */
media_info->media_port[media_info->media_count] = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
DPRINT(("parsed media_port=%s, for media_count=%d",
media_info->media_port[media_info->media_count],
media_info->media_count));
it = proto_tree_add_string(sdp_media_tree, hf_media_port_string, tvb, offset, tokenlen,
media_info->media_port[media_info->media_count]);
if (g_ascii_isdigit(media_info->media_port[media_info->media_count][0])) {
PROTO_ITEM_SET_HIDDEN(it);
proto_tree_add_uint(sdp_media_tree, hf_media_port, tvb, offset, tokenlen,
atoi(media_info->media_port[media_info->media_count]));
}
offset = next_offset + 1;
tokenlen = find_next_token_in_line(tvb, sdp_media_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
/* TODO: this puts the (optional) number of ports in the tree, but we don't
actually use it for building the extra RTP flows, which we should. */
proto_tree_add_item(sdp_media_tree, hf_media_portcount, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
offset = next_offset + 1;
} else {
tokenlen = find_next_token_in_line(tvb, sdp_media_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
/* Save port info */
media_info->media_port[media_info->media_count] = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
DPRINT(("parsed media_port=%s, for media_count=%d",
media_info->media_port[media_info->media_count],
media_info->media_count));
/* XXX Remember Port */
it = proto_tree_add_string(sdp_media_tree, hf_media_port_string, tvb, offset, tokenlen,
media_info->media_port[media_info->media_count]);
if (g_ascii_isdigit(media_info->media_port[media_info->media_count][0])) {
PROTO_ITEM_SET_HIDDEN(it);
proto_tree_add_uint(sdp_media_tree, hf_media_port, tvb, offset, tokenlen,
atoi(media_info->media_port[media_info->media_count]));
}
offset = next_offset + 1;
}
tokenlen = find_next_token_in_line(tvb, sdp_media_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
/* Save port protocol */
media_info->media_proto[media_info->media_count] = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
DPRINT(("parsed media_proto=%s, for media_count=%d",
media_info->media_proto[media_info->media_count],
media_info->media_count));
/* XXX Remember Protocol */
proto_tree_add_item(sdp_media_tree, hf_media_proto, tvb, offset, tokenlen,
ENC_UTF_8|ENC_NA);
do {
offset = next_offset + 1;
tokenlen = find_next_optional_token_in_line(tvb, sdp_media_tree,
&offset, &next_offset, optional);
if (tokenlen == 0)
break;
if (!strcmp(media_info->media_proto[media_info->media_count], "RTP/AVP")) {
media_format = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
if (g_ascii_isdigit(media_format[0])) {
proto_tree_add_string(sdp_media_tree, hf_media_format, tvb, offset,
tokenlen, val_to_str_ext((guint32)strtoul((char*)media_format, NULL, 10), &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] = (gint32)strtol((char*)media_format, NULL, 10);
DPRINT(("parsed media codec pt=%d, for media_count=%d",
transport_info->media[transport_info->media_count].pt[idx],
transport_info->media_count));
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_UTF_8|ENC_NA);
}
} else {
proto_tree_add_item(sdp_media_tree, hf_media_format, tvb, offset,
tokenlen, ENC_UTF_8|ENC_NA);
}
optional = TRUE;
} while (next_offset != -1);
/* 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 = (guint8 *)wmem_alloc(pinfo->pool, 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);
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_debug(tree, tvb, offset, tokenlen, "Debug; Analysed string: '%s'",
tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_ASCII));
#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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
#if 0
proto_tree_add_debug(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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_mpeg4_profile_level_id, tvb, offset, tokenlen,
(guint32)strtol((char*)format_specific_parameter, NULL, 10));
PROTO_ITEM_SET_GENERATED(item);
} else if (strcmp((char*)field_name, "config") == 0) {
/* String including "=" */
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
/* 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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_h263_profile, tvb, offset, tokenlen,
(guint32)strtol((char*)format_specific_parameter, NULL, 10));
PROTO_ITEM_SET_GENERATED(item);
} else if (strcmp((char*)field_name, "level") == 0) {
offset++;
tokenlen = end_offset - offset;
format_specific_parameter = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
item = proto_tree_add_uint(tree, hf_sdp_fmtp_h263_level, tvb, offset, tokenlen,
(guint32)strtol((char*)format_specific_parameter, NULL, 10));
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) || (g_ascii_strcasecmp(mime_type, "H264-SVC") == 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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
data_tvb = ascii_bytes_to_tvb(tvb, pinfo, tokenlen, format_specific_parameter);
if (!data_tvb) {
proto_tree_add_expert_format(tree, pinfo, &ei_sdp_invalid_conversion, 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_expert_format(tree, pinfo, &ei_sdp_invalid_conversion, 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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
item = proto_tree_add_uint(tree, hf_sdp_h264_packetization_mode, tvb, offset, tokenlen,
(guint32)strtol((char*)format_specific_parameter, NULL, 10));
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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
proto_tree_add_string(tree, hf_sdp_nal_unit_1_string, tvb, offset, tokenlen, 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_NONFATAL_ERRORS {
show_exception(tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
}
ENDTRY;
if (comma_offset != -1) {
/* Second NAL unit */
offset = comma_offset +1;
tokenlen = end_offset - offset;
data_p = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
proto_tree_add_string(tree, hf_sdp_nal_unit_2_string, tvb, offset, tokenlen, 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, disposable_media_info_t *media_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;
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;
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_UTF_8|ENC_NA);
/*??field_name = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_ASCII);*/
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_string_enc(wmem_packet_scope(), tvb, offset, tvb_length_remaining(tvb, offset), ENC_UTF_8|ENC_NA);
/*********************************************/
/* 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_UTF_8|ENC_NA);
payload_type = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
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_UTF_8|ENC_NA);
pt = atoi((char*)payload_type);
if (pt >= SDP_NO_OF_PT) {
return; /* Invalid */
}
transport_info->encoding_name[pt] = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
next_offset = next_offset + 1;
offset = next_offset;
while (length-1 >= next_offset) {
if (!g_ascii_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_UTF_8|ENC_NA);
transport_info->sample_rate[pt] = atoi(tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA));
/* 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++) {
rtp_dyn_payload_insert(transport_info->media[n].rtp_dyn_payload,
pt,
transport_info->encoding_name[pt],
transport_info->sample_rate[pt]);
}
return;
/* if the "a=" is after an "m=", only apply to this "m=" */
}
rtp_dyn_payload_insert(transport_info->media[ transport_info->media_count ].rtp_dyn_payload,
pt, transport_info->encoding_name[pt], transport_info->sample_rate[pt]);
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_UTF_8|ENC_NA);
media_format = atoi((char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA));
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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_ASCII);
#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_UTF_8|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, '/');
if (port_end_offset == -1) {
/* No "/" look for the ";" */
port_end_offset = tvb_find_guint8(tvb, port_offset, -1, ';');
}
/* Attempt to convert address */
if (str_to_ip((char*)tvb_get_string_enc(wmem_packet_scope(), tvb, address_offset, port_offset-address_offset, ENC_UTF_8|ENC_NA),
&media_info->msrp_ipaddr)) {
/* Get port number */
media_info->msrp_port_number = atoi((char*)tvb_get_string_enc(wmem_packet_scope(), tvb, port_offset + 1, port_end_offset - port_offset - 1, ENC_UTF_8|ENC_NA));
/* Set flag so this info can be used */
media_info->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 */
tokenlen = find_next_token_in_line(tvb, sdp_media_attribute_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
proto_tree_add_uint(sdp_media_attribute_tree, hf_sdp_crypto_tag, tvb, offset, tokenlen,
atoi((char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA)));
offset = next_offset + 1;
/* crypto-suite */
tokenlen = find_next_token_in_line(tvb, sdp_media_attribute_tree, &offset, &next_offset);
if (tokenlen == 0)
return;
parameter_item = proto_tree_add_item(sdp_media_attribute_tree, hf_sdp_crypto_crypto_suite,
tvb, offset, tokenlen, ENC_UTF_8|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);
}
/* key-method or key-method-ext */
next_offset = tvb_find_guint8(tvb, offset, -1, ':');
if (next_offset == -1) {
expert_add_info(pinfo, parameter_item, &ei_sdp_invalid_key_param);
break;
}
if (tvb_strncaseeql(tvb, offset, "inline", next_offset-offset) == 0) {
parameter_tree = proto_tree_add_subtree(sdp_media_attribute_tree, tvb, offset,
param_end_offset-offset, ett_sdp_crypto_key_parameters, NULL, "Key parameters");
/* 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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
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_item(parameter_tree, hf_sdp_key_and_salt, tvb, offset, tokenlen, ENC_NA);
proto_tree_add_item(parameter_tree, hf_sdp_crypto_master_key,
key_salt_tvb, 0, master_key_length, ENC_NA);
proto_tree_add_item(parameter_tree, hf_sdp_crypto_master_salt,
key_salt_tvb, master_key_length, master_salt_length, ENC_NA);
} else {
proto_tree_add_item(parameter_tree, hf_sdp_key_and_salt, key_salt_tvb, 0, -1, ENC_NA);
}
/* ["|" lifetime] ["|" mki] are optional */
if (next_offset != -1) {
offset = next_offset + 1;
next_offset = tvb_find_guint8(tvb, offset, -1, '|');
if (next_offset == -1) {
if (next_offset < param_end_offset){
next_offset = param_end_offset;
}
}
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_UTF_8|ENC_NA);
offset = next_offset + 1;
}
/* mki = mki-value ":" mki-length
*
* mki-value = 1*DIGIT
*/
if (offset>param_end_offset) {
next_offset = -1;
} else {
next_offset = tvb_find_guint8(tvb, offset, -1, ':');
}
if (next_offset != -1) {
tokenlen = next_offset - offset;
proto_tree_add_item(parameter_tree, hf_sdp_crypto_mki, tvb, offset, tokenlen, ENC_UTF_8|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_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_UTF_8|ENC_NA));
proto_tree_add_item(parameter_tree, hf_sdp_crypto_mki_length,
tvb, offset, tokenlen, ENC_UTF_8|ENC_NA);
}
}
offset = param_end_offset;
} else {
break;
}
}
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_UTF_8|ENC_NA);
break;
}
}
static void
call_sdp_subdissector(tvbuff_t *tvb, packet_info *pinfo, int hf, proto_tree* ti, int length,
transport_info_t *transport_info, disposable_media_info_t *media_info) {
if (hf == hf_owner) {
dissect_sdp_owner(tvb, ti);
} else if (hf == hf_connection_info) {
dissect_sdp_connection_info(tvb, ti, media_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, media_info);
} else if (hf == hf_media_attribute) {
dissect_sdp_media_attribute(tvb, pinfo, ti, length, transport_info, media_info);
}
}
static void
convert_disposable_media(transport_info_t* transport_info, disposable_media_info_t* media_info,
gint start_transport_info_count)
{
gint8 n, transport_index;
guint proto_bitmask;
for (n = 0; (n < media_info->media_count) && (n+start_transport_info_count < SDP_MAX_RTP_CHANNELS); n++)
{
transport_index = n+start_transport_info_count;
if (media_info->media_port[n] != NULL) {
transport_info->media_port[transport_index] = (int)strtol(media_info->media_port[n], NULL, 10);
DPRINT(("set transport_info media port number=%d, for transport_index=%d",
transport_info->media_port[transport_index], transport_index));
}
if (media_info->media_proto[n] != NULL) {
/* Check if media protocol is RTP
* and stream decoding is enabled in preferences
*/
if (global_sdp_establish_conversation) {
proto_bitmask = 0;
/* Check if media protocol is RTP */
/* XXX: what about 'RTP/AVPF' or RTP/SAVPF'? */
if (!strcmp(media_info->media_proto[n],"RTP/AVP")) {
transport_info->proto_bitmask[transport_index] |= SDP_RTP_PROTO;
proto_bitmask |= SDP_RTP_PROTO;
DPRINT(("set SDP_RTP_PROTO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
/* Check if media protocol is SRTP */
else if (!strcmp(media_info->media_proto[n],"RTP/SAVP")) {
transport_info->proto_bitmask[transport_index] |= SDP_SRTP_PROTO;
proto_bitmask |= SDP_SRTP_PROTO;
DPRINT(("set SDP_SRTP_PROTO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
/* Check if media protocol is T38 */
else if ((!strcmp(media_info->media_proto[n],"UDPTL")) ||
(!strcmp(media_info->media_proto[n],"udptl"))) {
transport_info->proto_bitmask[transport_index] |= SDP_T38_PROTO;
proto_bitmask |= SDP_T38_PROTO;
DPRINT(("set SDP_T38_PROTO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
/* Check if media protocol is MSRP/TCP */
else if (!strcmp(media_info->media_proto[n],"msrp/tcp")) {
transport_info->proto_bitmask[transport_index] |= SDP_MSRP_PROTO;
proto_bitmask |= SDP_MSRP_PROTO;
DPRINT(("set SDP_MSRP_PROTO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
/* Check if media protocol is SPRT */
else if ((!strcmp(media_info->media_proto[n],"UDPSPRT")) ||
(!strcmp(media_info->media_proto[n],"udpsprt"))) {
transport_info->proto_bitmask[transport_index] |= SDP_SPRT_PROTO;
proto_bitmask |= SDP_SPRT_PROTO;
DPRINT(("set SDP_SPRT_PROTO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
/* now check if this stream's port==0, in which case we need to disable its paired stream */
if (transport_info->media_port[transport_index] == 0) {
/* This should disable the matching media session in the offer - it's a bit of a hack though,
basically start_transport_info_count is 0 for the offer, and >0 for the answer, so we
check that and if this is the answer, then we go set the offer's paired stream to 0.
If it turns out we got a port=0 in the offer, we don't care and it's ok to let the
answer have a non-port=0 (though that would be illegal per the RFCs). */
if (start_transport_info_count > 0 && (proto_bitmask & transport_info->proto_bitmask[n])) {
transport_info->media_port[n] = 0;
DPRINT(("disabled media_port=%d, for transport_index=%d",
n, transport_index));
}
}
}
}
if ((media_info->connection_address != NULL) &&
(media_info->connection_type != NULL)) {
if (strcmp(media_info->connection_type, "IP4") == 0) {
transport_info->src_addr[transport_index].data = wmem_alloc(wmem_file_scope(), 4);
if (str_to_ip(media_info->connection_address, (void*)transport_info->src_addr[transport_index].data)) {
/* connection_address could be converted to a valid ipv4 address*/
transport_info->proto_bitmask[transport_index] |= SDP_IPv4;
transport_info->src_addr[transport_index].type = AT_IPv4;
transport_info->src_addr[transport_index].len = 4;
DPRINT(("set SDP_IPv4 bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
} else if (strcmp(media_info->connection_type, "IP6") == 0) {
transport_info->src_addr[transport_index].data = wmem_alloc(wmem_file_scope(), 16);
if (str_to_ip6(media_info->connection_address, (void*)transport_info->src_addr[transport_index].data)) {
/* connection_address could be converted to a valid ipv6 address*/
transport_info->proto_bitmask[transport_index] |= SDP_IPv6;
transport_info->src_addr[transport_index].type = AT_IPv6;
transport_info->src_addr[transport_index].len = 16;
DPRINT(("set SDP_IPv6 bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
}
}
/* MSRP uses addresses discovered in attribute
rather than connection information of media session line */
if ((transport_info->proto_bitmask[transport_index] & SDP_MSRP_PROTO) &&
(transport_info->proto_bitmask[transport_index] & SDP_MSRP_IPv4) &&
msrp_handle) {
transport_info->src_addr[transport_index].type = AT_IPv4;
transport_info->src_addr[transport_index].len = 4;
transport_info->src_addr[transport_index].data = wmem_memdup(wmem_file_scope(), media_info->msrp_ipaddr, 4);
transport_info->media_port[transport_index] = media_info->msrp_port_number;
}
if ((media_info->media_type[transport_index] != NULL) &&
(strcmp(media_info->media_type[transport_index], "video") == 0)) {
transport_info->proto_bitmask[transport_index] |= SDP_VIDEO;
DPRINT(("set SDP_VIDEO bitmask=%x, for transport_index=%d",
transport_info->proto_bitmask[transport_index], transport_index));
}
}
}
void
setup_sdp_transport(tvbuff_t *tvb, packet_info *pinfo, enum sdp_exchange_type exchange_type,
int request_frame, const gboolean delay)
{
gint offset = 0, next_offset, n;
int linelen;
gboolean in_media_description = FALSE;
guchar type, delim;
const int tokenoffset = 2;
int hf = -1;
gint start_transport_info_count = 0;
transport_info_t* transport_info = NULL;
disposable_media_info_t media_info;
struct srtp_info *srtp_info = NULL;
DPRINT2(("-------------------- setup_sdp_transport -------------------"));
/* Only do this once during first pass */
if (pinfo->fd->flags.visited) {
DPRINT(("already visited"));
return;
}
memset(&media_info, 0, sizeof(media_info));
if (request_frame != 0)
transport_info = (transport_info_t*)wmem_tree_lookup32( sdp_transport_reqs, request_frame );
if (transport_info == NULL) {
transport_info = wmem_new0(wmem_file_scope(), transport_info_t);
transport_info->media_count = -1;
for (n = 0; n < SDP_NO_OF_PT; n++) {
transport_info->encoding_name[n] = (char*)UNKNOWN_ENCODING;
}
for (n = 0; n < SDP_MAX_RTP_CHANNELS; n++) {
transport_info->media[n].rtp_dyn_payload = rtp_dyn_payload_new();
transport_info->media[n].set_rtp = FALSE;
}
if (request_frame != 0)
wmem_tree_insert32(sdp_transport_reqs, request_frame, (void *)transport_info);
}
#ifdef DEBUG_CONVERSATION
else {
DPRINT(("found previous transport_info:"));
sdp_dump_transport_info(transport_info);
}
#endif
if (exchange_type != SDP_EXCHANGE_OFFER)
wmem_tree_insert32(sdp_transport_rsps, pinfo->fd->num, (void *)transport_info);
/* Offer has already been answered or rejected and hash tables freed, so
* don't try to add to it
* XXX - Need to support "modified offers" */
if ((transport_info->sdp_status == SDP_EXCHANGE_ANSWER_REJECT) ||
(transport_info->sdp_status == SDP_EXCHANGE_ANSWER_ACCEPT))
return;
if (transport_info->media_count > 0)
start_transport_info_count = transport_info->media_count;
DPRINT(("start_transport_info_count=%d", start_transport_info_count));
/* if we don't delay, and this is an answer after a previous offer, then
we free'd the unused media rtp_dyn_payload last time while processing
the offer, so we need to re-create them this time in case we need them.
If they don't get used they'll get free'd again later */
if (!delay && (exchange_type == SDP_EXCHANGE_ANSWER_ACCEPT) &&
(transport_info->sdp_status == SDP_EXCHANGE_OFFER)) {
for (n = start_transport_info_count; n < SDP_MAX_RTP_CHANNELS; n++) {
if (!transport_info->media[n].rtp_dyn_payload)
transport_info->media[n].rtp_dyn_payload = rtp_dyn_payload_new();
}
}
/*
* Show the SDP message a line at a time.
*/
while (tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
/*
* Line must contain at least e.g. "v=".
*/
if (linelen < 2)
break;
type = tvb_get_guint8(tvb, offset);
delim = tvb_get_guint8(tvb, offset + 1);
if (delim != '=') {
offset = next_offset;
continue;
}
/*
* Attributes. Only care about ones that affect the transport. Ignore others.
*/
switch (type) {
case 'c':
hf = hf_connection_info;
break;
case 'm':
hf = hf_media;
/* Increase the count of media channels, but don't walk off the end of the arrays. */
if (((transport_info->media_count < 0) && (in_media_description == FALSE)) || (transport_info->media_count < (SDP_MAX_RTP_CHANNELS-1)))
transport_info->media_count++;
if (in_media_description && (media_info.media_count < (SDP_MAX_RTP_CHANNELS-1)))
media_info.media_count++;
in_media_description = TRUE;
DPRINT(("in media description, transport_info->media_count=%d, "
"media_info.media_count=%d",
transport_info->media_count, media_info.media_count));
break;
case 'a':
if (in_media_description) {
hf = hf_media_attribute;
} else {
hf = hf_session_attribute;
}
break;
default:
hf = hf_unknown;
break;
}
if (hf != hf_unknown)
{
DINDENT();
call_sdp_subdissector(tvb_new_subset_length(tvb, offset + tokenoffset,
linelen - tokenoffset),
pinfo,
hf, NULL, linelen-tokenoffset, transport_info, &media_info);
DENDENT();
}
offset = next_offset;
}
if (in_media_description) {
/* Increase the count of media channels, but don't walk off the end of the arrays. */
/* XXX: I don't know why this was done here - I'm keeping it here in case
* removing it causes problems, but it's wrong. transport_info->media_count
* is already incremented in the while() loop above. Incrementing it
* again here will cause bugs. The name of this is misleading, because
* 'transport_info->media_count' is actually an index, not count.
* In other words, it's a 0-based number, of the current rtp channel.
* So debug printing shows bogus rtp channels get created and then later
* removed because luckily it knows they were bogus. But it will cause bugs
* because if we're not delaying, then for the SDP_EXCHANGE_ANSWER_ACCEPT
* run through this function, it will add new RTP channels at a +1 index,
* which will likely cause problems.
*/
if (transport_info->media_count < (SDP_MAX_RTP_CHANNELS-1))
transport_info->media_count++;
if (media_info.media_count < (SDP_MAX_RTP_CHANNELS-1))
media_info.media_count++;
}
#ifdef DEBUG_CONVERSATION
sdp_dump_disposable_media_info(&media_info);
#endif
DPRINT(("calling convert_disposable_media(), transport_info->media_count=%d, "
"media_info.media_count=%d, start_transport_info_count=%d",
transport_info->media_count, media_info.media_count, start_transport_info_count));
DINDENT();
/* Take all of the collected strings and convert them into something permanent
* for the life of the capture
*/
convert_disposable_media(transport_info, &media_info, start_transport_info_count);
DENDENT();
#ifdef DEBUG_CONVERSATION
sdp_dump_transport_info(transport_info);
#endif
/* We have a successful negotiation, apply data to their respective protocols */
if (!delay || ((exchange_type == SDP_EXCHANGE_ANSWER_ACCEPT) &&
(transport_info->sdp_status == SDP_EXCHANGE_OFFER))) {
for (n = 0; n <= transport_info->media_count; n++) {
guint32 current_rtp_port = 0;
/* Add (s)rtp and (s)rtcp conversation, if available (overrides t38 if conversation already set) */
if ((transport_info->media_port[n] != 0) &&
(transport_info->proto_bitmask[n] & (SDP_RTP_PROTO|SDP_SRTP_PROTO)) &&
(transport_info->proto_bitmask[n] & (SDP_IPv4|SDP_IPv6))) {
if (transport_info->proto_bitmask[n] & SDP_SRTP_PROTO) {
srtp_info = wmem_new0(wmem_file_scope(), 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;
}
DPRINT(("calling srtp_add_address, channel=%d, media_port=%d",
n, transport_info->media_port[n]));
DINDENT();
/* srtp_add_address and rtp_add_address are given the request_frame's not this frame's number,
because that's where the RTP flow started, and thus conversation needs to check against */
srtp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", request_frame,
(transport_info->proto_bitmask[n] & SDP_VIDEO) ? TRUE : FALSE,
transport_info->media[n].rtp_dyn_payload, srtp_info);
DENDENT();
} else {
DPRINT(("calling rtp_add_address, channel=%d, media_port=%d",
n, transport_info->media_port[n]));
DINDENT();
rtp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", request_frame,
(transport_info->proto_bitmask[n] & SDP_VIDEO) ? TRUE : FALSE,
transport_info->media[n].rtp_dyn_payload);
DENDENT();
}
transport_info->media[n].set_rtp = TRUE;
/* SPRT might use the same port... */
current_rtp_port = transport_info->media_port[n];
if (rtcp_handle) {
if (transport_info->proto_bitmask[n] & SDP_SRTP_PROTO) {
DPRINT(("calling rtcp_add_address, channel=%d, media_port=%d",
n, transport_info->media_port[n]+1));
DINDENT();
srtcp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n]+1, 0, "SDP", request_frame, srtp_info);
DENDENT();
} else {
DPRINT(("calling rtcp_add_address, channel=%d, media_port=%d",
n, transport_info->media_port[n]+1));
DINDENT();
rtcp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n]+1, 0, "SDP", request_frame);
DENDENT();
}
}
}
/* add SPRT conversation */
if ((transport_info->proto_bitmask[n] & SDP_SPRT_PROTO) &&
(transport_info->proto_bitmask[n] & (SDP_IPv4|SDP_IPv6)) &&
(sprt_handle)) {
if (transport_info->media_port[n] == 0 && current_rtp_port) {
sprt_add_address(pinfo, &transport_info->src_addr[n], current_rtp_port,
0, "SDP", pinfo->fd->num); /* will use same port as RTP */
} else {
sprt_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num);
}
}
/* Add t38 conversation, if available and only if no rtp */
if ((transport_info->media_port[n] != 0) &&
!transport_info->media[n].set_rtp &&
(transport_info->proto_bitmask[n] & SDP_T38_PROTO) &&
(transport_info->proto_bitmask[n] & SDP_IPv4)) {
t38_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num);
}
/* Add MSRP conversation. Uses addresses discovered in attribute
rather than connection information of media session line
(already handled in media conversion) */
if ((transport_info->proto_bitmask[n] & SDP_MSRP_PROTO) &&
(transport_info->proto_bitmask[n] & SDP_MSRP_IPv4) &&
msrp_handle) {
msrp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], "SDP", pinfo->fd->num);
}
/* Free the hash table if we did't assigned it to a conv use it */
if (!transport_info->media[n].set_rtp)
{
DPRINT(("set_rtp is not set, calling rtp_dyn_payload_free, "
"channel=%d, media_port=%d",
n, transport_info->media_port[n]));
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
} /* end for (n = 0; n <= transport_info->media_count; n++) */
/* Free the remaining hash tables not used */
if (transport_info->media_count == -1)
{
for (n = 0; n < SDP_MAX_RTP_CHANNELS; n++)
{
if (!transport_info->media[n].set_rtp)
{
DPRINT(("media_count == -1, calling rtp_dyn_payload_free, "
"channel=%d, media_port=%d",
n, transport_info->media_port[n]));
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
}
}
else
{
for (n = transport_info->media_count; n < SDP_MAX_RTP_CHANNELS; n++)
{
if (!transport_info->media[n].set_rtp)
{
DPRINT(("media_count != -1, calling rtp_dyn_payload_free, "
"channel=%d, media_port=%d",
n, transport_info->media_port[n]));
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
}
}
transport_info->sdp_status = exchange_type;
} else if ((exchange_type == SDP_EXCHANGE_ANSWER_REJECT) &&
(transport_info->sdp_status != SDP_EXCHANGE_ANSWER_REJECT)) {
/* Free the hash tables, since they won't be put to use */
for (n = 0; n < SDP_MAX_RTP_CHANNELS; n++)
{
if (!transport_info->media[n].set_rtp)
{
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
}
transport_info->sdp_status = SDP_EXCHANGE_ANSWER_REJECT;
}
}
void setup_sdp_transport_resend(int current_frame, int request_frame)
{
transport_info_t* transport_info = NULL;
if (request_frame != 0) {
transport_info = (transport_info_t*)wmem_tree_lookup32( sdp_transport_reqs, request_frame );
if (transport_info != NULL) {
wmem_tree_insert32(sdp_transport_reqs, current_frame, (void *)transport_info);
}
}
}
static void
dissect_sdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *sdp_tree;
proto_item *ti, *sub_ti;
gint offset = 0, next_offset, n, i;
int linelen;
gboolean in_media_description;
guchar type, delim;
int datalen, tokenoffset, hf = -1;
char *string;
transport_info_t local_transport_info;
transport_info_t* transport_info = NULL;
disposable_media_info_t media_info;
sdp_packet_info *sdp_pi;
struct srtp_info *srtp_info = NULL;
DPRINT2(("----------------------- dissect_sdp ------------------------"));
/* Initialise packet info for passing to tap */
sdp_pi = wmem_new(wmem_packet_scope(), sdp_packet_info);
sdp_pi->summary_str[0] = '\0';
if (!pinfo->fd->flags.visited) {
transport_info = (transport_info_t*)wmem_tree_lookup32( sdp_transport_reqs, pinfo->fd->num );
if (transport_info == NULL) {
/* Can't find it in the requests, make sure it's not a response */
transport_info = (transport_info_t*)wmem_tree_lookup32( sdp_transport_rsps, pinfo->fd->num );
}
}
if (transport_info == NULL) {
transport_info = &local_transport_info;
}
#ifdef DEBUG_CONVERSATION
else {
DPRINT(("found previous transport_info:"));
sdp_dump_transport_info(transport_info);
}
#endif
/* Initialize local transport info */
memset(&local_transport_info, 0, sizeof(local_transport_info));
local_transport_info.media_count = -1;
for (n = 0; n < SDP_NO_OF_PT; n++) {
local_transport_info.encoding_name[n] = (char*)UNKNOWN_ENCODING;
}
for (n = 0; n < SDP_MAX_RTP_CHANNELS; n++) {
local_transport_info.media[n].rtp_dyn_payload = rtp_dyn_payload_new();
local_transport_info.media[n].set_rtp = FALSE;
}
memset(&media_info, 0, sizeof(media_info));
/*
* As RFC 2327 says, "SDP is purely a format for session
* description - it does not incorporate a transport protocol,
* and is intended to use different transport protocols as
* appropriate including the Session Announcement Protocol,
* Session Initiation Protocol, Real-Time Streaming Protocol,
* electronic mail using the MIME extensions, and the
* Hypertext Transport Protocol."
*
* We therefore don't set the protocol or info columns;
* instead, we append to them, so that we don't erase
* what the protocol inside which the SDP stuff resides
* put there.
*/
col_append_str(pinfo->cinfo, COL_PROTOCOL, "/SDP");
/* XXX: Needs description.
* Putting with session description in info col is redundant when it's in the
* protocol col in my opinion, commenting it out for now 2012-10-09. Remove if no one complains.
* If some one want it consider " ,with SDP"
*/
/*col_append_str(pinfo->cinfo, COL_INFO, ", with session description");*/
ti = proto_tree_add_item(tree, proto_sdp, tvb, offset, -1, ENC_NA);
sdp_tree = proto_item_add_subtree(ti, ett_sdp);
/*
* Show the SDP message a line at a time.
*/
in_media_description = FALSE;
while (tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
/*
* Line must contain at least e.g. "v=".
*/
if (linelen < 2)
break;
type = tvb_get_guint8(tvb, offset);
delim = tvb_get_guint8(tvb, offset + 1);
if (delim != '=') {
proto_item *ti2 = proto_tree_add_item(sdp_tree, hf_invalid, tvb, offset, linelen, ENC_UTF_8|ENC_NA);
expert_add_info(pinfo, ti2, &ei_sdp_invalid_line_equal);
offset = next_offset;
continue;
}
/*
* Attributes.
*/
switch (type) {
case 'v':
hf = hf_protocol_version;
break;
case 'o':
hf = hf_owner;
break;
case 's':
hf = hf_session_name;
break;
case 'i':
if (in_media_description) {
hf = hf_media_title;
} else {
hf = hf_session_info;
}
break;
case 'u':
hf = hf_uri;
break;
case 'e':
hf = hf_email;
break;
case 'p':
hf = hf_phone;
break;
case 'c':
hf = hf_connection_info;
break;
case 'b':
hf = hf_bandwidth;
break;
case 't':
hf = hf_time;
break;
case 'r':
hf = hf_repeat_time;
break;
case 'm':
hf = hf_media;
/* Increase the count of media channels, but don't walk off the end of the arrays. */
if (local_transport_info.media_count < (SDP_MAX_RTP_CHANNELS-1))
local_transport_info.media_count++;
if (in_media_description && (media_info.media_count < (SDP_MAX_RTP_CHANNELS-1)))
media_info.media_count++;
in_media_description = TRUE;
break;
case 'k':
hf = hf_encryption_key;
break;
case 'a':
if (in_media_description) {
hf = hf_media_attribute;
} else {
hf = hf_session_attribute;
}
break;
case 'z':
hf = hf_timezone;
break;
default:
hf = hf_unknown;
break;
}
tokenoffset = 2;
if (hf == hf_unknown)
tokenoffset = 0;
string = (char*)tvb_get_string_enc(wmem_packet_scope(), tvb, offset + tokenoffset,
linelen - tokenoffset, ENC_ASCII);
sub_ti = proto_tree_add_string(sdp_tree, hf, tvb, offset, linelen,
string);
call_sdp_subdissector(tvb_new_subset_length(tvb, offset + tokenoffset,
linelen - tokenoffset),
pinfo,
hf, sub_ti, linelen-tokenoffset,
&local_transport_info, &media_info);
offset = next_offset;
}
if (in_media_description) {
/* Increase the count of media channels, but don't walk off the end of the arrays. */
if (local_transport_info.media_count < (SDP_MAX_RTP_CHANNELS-1))
local_transport_info.media_count++;
if (media_info.media_count < (SDP_MAX_RTP_CHANNELS-1))
media_info.media_count++;
}
/* Take all of the collected strings and convert them into something permanent
* for the life of the capture
*/
if (transport_info == &local_transport_info) {
DPRINT(("no previous transport_info saved, calling convert_disposable_media()"));
DINDENT();
convert_disposable_media(transport_info, &media_info, 0);
DENDENT();
#ifdef DEBUG_CONVERSATION
sdp_dump_transport_info(transport_info);
#endif
}
#ifdef DEBUG_CONVERSATION
else {
DPRINT(("not overwriting previous transport_info, local_transport_info contents:"));
sdp_dump_transport_info(&local_transport_info);
}
#endif
for (n = 0; n < local_transport_info.media_count; n++)
{
/* Add (s)rtp and (s)rtcp conversation, if available (overrides t38 if conversation already set) */
/* XXX - This is a placeholder for higher layer protocols that haven't implemented the proper
* OFFER/ANSWER functionality using setup_sdp_transport(). Once all of the higher layers
* use setup_sdp_transport(), this should be removed
*/
guint32 current_rtp_port = 0;
if ((!pinfo->fd->flags.visited) && (transport_info == &local_transport_info) &&
(transport_info->media_port[n] != 0) &&
(transport_info->proto_bitmask[n] & (SDP_RTP_PROTO|SDP_SRTP_PROTO)) &&
(transport_info->proto_bitmask[n] & (SDP_IPv4|SDP_IPv6))) {
if (transport_info->proto_bitmask[n] & SDP_SRTP_PROTO) {
srtp_info = wmem_new0(wmem_file_scope(), 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;
}
DPRINT(("calling srtp_add_address for media_port=%d, for channel=%d",
transport_info->media_port[n],n));
DINDENT();
srtp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num,
(transport_info->proto_bitmask[n] & SDP_VIDEO) ? TRUE : FALSE,
transport_info->media[n].rtp_dyn_payload, srtp_info);
DENDENT();
} else {
DPRINT(("calling rtp_add_address for media_port=%d, for channel=%d",
transport_info->media_port[n],n));
DINDENT();
rtp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num,
(transport_info->proto_bitmask[n] & SDP_VIDEO) ? TRUE : FALSE,
transport_info->media[n].rtp_dyn_payload);
DENDENT();
}
transport_info->media[n].set_rtp = TRUE;
/* SPRT might use the same port... */
current_rtp_port = transport_info->media_port[n];
if (rtcp_handle) {
if (transport_info->proto_bitmask[n] & SDP_SRTP_PROTO) {
DPRINT(("calling srtcp_add_address for media_port=%d, for channel=%d",
transport_info->media_port[n],n));
DINDENT();
srtcp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n]+1, 0, "SDP", pinfo->fd->num, srtp_info);
DENDENT();
} else {
DPRINT(("calling rtcp_add_address for media_port=%d, for channel=%d",
transport_info->media_port[n],n));
DINDENT();
rtcp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n]+1, 0, "SDP", pinfo->fd->num);
DENDENT();
}
}
}
/* add SPRT conversation */
/* XXX - more placeholder functionality */
if ((!pinfo->fd->flags.visited) && (transport_info == &local_transport_info) &&
(transport_info->proto_bitmask[n] & SDP_SPRT_PROTO) &&
(transport_info->proto_bitmask[n] & (SDP_IPv4|SDP_IPv6)) &&
(sprt_handle)) {
if (transport_info->media_port[n] == 0 && current_rtp_port) {
sprt_add_address(pinfo, &transport_info->src_addr[n], current_rtp_port,
0, "SDP", pinfo->fd->num); /* will use same port as RTP */
} else {
sprt_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num);
}
}
/* Add t38 conversation, if available and only if no rtp */
/* XXX - more placeholder functionality */
if ((!pinfo->fd->flags.visited) && (transport_info == &local_transport_info) &&
(transport_info->media_port[n] != 0) &&
!transport_info->media[n].set_rtp &&
(transport_info->proto_bitmask[n] & SDP_T38_PROTO) &&
(transport_info->proto_bitmask[n] & SDP_IPv4)) {
t38_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], 0, "SDP", pinfo->fd->num);
}
/* Add MSRP conversation. Uses addresses discovered in attribute
rather than connection information of media session line */
/* XXX - more placeholder functionality */
if ((!pinfo->fd->flags.visited) && (transport_info == &local_transport_info) &&
(transport_info->proto_bitmask[n] & SDP_MSRP_PROTO) &&
(transport_info->proto_bitmask[n] & SDP_MSRP_IPv4) &&
msrp_handle) {
msrp_add_address(pinfo, &transport_info->src_addr[n], transport_info->media_port[n], "SDP", pinfo->fd->num);
}
if (local_transport_info.media_port[n] != 0) {
/* Create the RTP summary str for the Voip Call analysis.
* XXX - Currently this is based only on the current packet
*/
for (i = 0; i < local_transport_info.media[n].pt_count; i++)
{
DPRINT(("in for-loop for voip call analysis setting for media #%d, pt=%d",
i, local_transport_info.media[n].pt[i]));
/* if the payload type is dynamic (96 to 127), check the hash table to add the desc in the SDP summary */
if ((local_transport_info.media[n].pt[i] >= 96) && (local_transport_info.media[n].pt[i] <= 127)) {
const gchar *payload_type_str = rtp_dyn_payload_get_name(
local_transport_info.media[n].rtp_dyn_payload,
local_transport_info.media[n].pt[i]);
if (payload_type_str) {
if (strlen(sdp_pi->summary_str))
g_strlcat(sdp_pi->summary_str, " ", 50);
g_strlcat(sdp_pi->summary_str, payload_type_str, 50);
} else {
char num_pt[10];
g_snprintf(num_pt, 10, "%u", local_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(local_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 */
/* XXX - more placeholder functionality */
if ((transport_info == &local_transport_info) &&
!transport_info->media[n].set_rtp)
{
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
/* Create the T38 summary str for the Voip Call analysis
* XXX - Currently this is based only on the current packet
*/
if ((local_transport_info.media_port[n] != 0) &&
(local_transport_info.proto_bitmask[n] & SDP_T38_PROTO)) {
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 */
/* XXX - more placeholder functionality */
if (transport_info == &local_transport_info) {
for (n = transport_info->media_count; n < SDP_MAX_RTP_CHANNELS; n++)
{
if (!transport_info->media[n].set_rtp)
{
rtp_dyn_payload_free(transport_info->media[n].rtp_dyn_payload);
transport_info->media[n].rtp_dyn_payload = NULL;
}
}
}
datalen = tvb_length_remaining(tvb, offset);
if (datalen > 0) {
proto_tree_add_item(sdp_tree, hf_sdp_data, tvb, offset, datalen, ENC_NA);
}
/* Report this packet to the tap */
tap_queue_packet(sdp_tap, pinfo, sdp_pi);
}
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_port_string,
{ "Media Port", "sdp.media.port_string",
FT_STRING, BASE_NONE, 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,
{ "Master 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 }
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_sdp_nal_unit_1_string, { "NAL unit 1 string", "sdp.nal_unit_1_string", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdp_nal_unit_2_string, { "NAL unit 2 string", "sdp.nal_unit_2_string", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdp_key_and_salt, { "Key and Salt", "sdp.key_and_salt", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdp_data, { "Data", "sdp.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_sdp,
&ett_sdp_owner,
&ett_sdp_connection_info,
&ett_sdp_bandwidth,
&ett_sdp_time,
&ett_sdp_repeat_time,
&ett_sdp_timezone,
&ett_sdp_encryption_key,
&ett_sdp_session_attribute,
&ett_sdp_media,
&ett_sdp_media_attribute,
&ett_sdp_fmtp,
&ett_sdp_key_mgmt,
&ett_sdp_crypto_key_parameters,
};
static ei_register_info ei[] = {
{ &ei_sdp_invalid_key_param,
{ "sdp.invalid_key_param",
PI_MALFORMED, PI_NOTE,
"Invalid key-param (no ':' delimiter)",
EXPFILL
}
},
{ &ei_sdp_invalid_line_equal,
{ "sdp.invalid_line.no_equal",
PI_MALFORMED, PI_NOTE,
"Invalid SDP line (no '=' delimiter)",
EXPFILL
}
},
{ &ei_sdp_invalid_line_fields,
{ "sdp.invalid_line.missing_fields",
PI_MALFORMED, PI_ERROR,
"Invalid SDP line (missing required fields)",
EXPFILL
}
},
{ &ei_sdp_invalid_line_space,
{ "sdp.invalid_line.extra_space",
PI_MALFORMED, PI_ERROR,
"Invalid SDP whitespace (extra space character)",
EXPFILL
}
},
{ &ei_sdp_invalid_conversion,
{ "sdp.invalid_conversion",
PI_PROTOCOL, PI_WARN,
"Invalid conversion",
EXPFILL
}
}
};
module_t *sdp_module;
expert_module_t* expert_sdp;
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));
expert_sdp = expert_register_protocol(proto_sdp);
expert_register_field_array(expert_sdp, ei, array_length(ei));
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);
sdp_transport_reqs = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
sdp_transport_rsps = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
/*
* 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");
/* compile patterns */
tvb_pbrk_compile(&pbrk_digits, "0123456789");
tvb_pbrk_compile(&pbrk_alpha, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
}
void
proto_reg_handoff_sdp(void)
{
dissector_handle_t sdp_handle;
rtcp_handle = find_dissector("rtcp");
msrp_handle = find_dissector("msrp");
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);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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