void
sip_parse_msg_media(sip_msg_t *msg, const u_char *payload)
{
address_t dst, src = { };
char media_type[MEDIATYPELEN] = { };
char media_format[30] = { };
uint32_t media_fmt_pref;
uint32_t media_fmt_code;
sdp_media_t *media = NULL;
char *payload2, *tofree, *line;
sip_call_t *call = msg_get_call(msg);
// Parse each line of payload looking for sdp information
tofree = payload2 = strdup((char*)payload);
while ((line = strsep(&payload2, "\r\n")) != NULL) {
// Check if we have a media string
if (!strncmp(line, "m=", 2)) {
if (sscanf(line, "m=%s %hu RTP/%*s %u", media_type, &dst.port, &media_fmt_pref) == 3) {
// Create a new media structure for this message
if ((media = media_create(msg))) {
media_set_type(media, media_type);
media_set_address(media, dst);
media_set_prefered_format(media, media_fmt_pref);
msg_add_media(msg, media);
/**
* From SDP we can only guess destination address port. RTP Capture proccess
* will determine when the stream has been completed, getting source address
* and port of the stream.
*/
// Create a new stream with this destination address:port
if (!call_msg_is_retrans(msg)) {
if (!rtp_find_call_stream(call, src, dst)) {
// Create RTP stream
call_add_stream(call, stream_create(media, dst, PACKET_RTP));
// Create early RTCP stream
dst.port++;
call_add_stream(call, stream_create(media, dst, PACKET_RTCP));
}
}
}
}
}
// Check if we have a connection string
if (!strncmp(line, "c=", 2)) {
if (sscanf(line, "c=IN IP4 %s", dst.ip) && media) {
media_set_address(media, dst);
}
}
// Check if we have attribute format string
if (!strncmp(line, "a=rtpmap:", 9)) {
if (media && sscanf(line, "a=rtpmap:%u %[^ ]", &media_fmt_code, media_format)) {
media_add_format(media, media_fmt_code, media_format);
}
}
// Check if we have attribute format RTCP port
if (!strncmp(line, "a=rtcp:", 7)) {
if (media && sscanf(line, "a=rtcp:%hu", &dst.port)) {
// Create early RTCP stream
if (!rtp_find_call_stream(call, src, dst)) {
call_add_stream(call, stream_create(media, dst, PACKET_RTCP));
}
}
}
}
sng_free(tofree);
}
void
sip_parse_msg_media(sip_msg_t *msg, const u_char *payload)
{
#define ADD_STREAM(stream) \
if (stream) { \
if (!rtp_find_call_stream(call, src, stream->dst)) { \
call_add_stream(call, stream); \
} else { \
sng_free(stream); \
stream = NULL; \
} \
}
address_t dst, src = { };
rtp_stream_t *rtp_stream = NULL, *rtcp_stream = NULL, *msg_rtp_stream = NULL;
char media_type[MEDIATYPELEN] = { };
char media_format[30] = { };
uint32_t media_fmt_pref;
uint32_t media_fmt_code;
sdp_media_t *media = NULL;
char *payload2, *tofree, *line;
sip_call_t *call = msg_get_call(msg);
// If message is retrans, there's no need to parse the payload again
if (msg->retrans) {
// Use the media vector from the original message
msg->medias = msg->retrans->medias;
return;
}
// Parse each line of payload looking for sdp information
tofree = payload2 = strdup((char*)payload);
while ((line = strsep(&payload2, "\r\n")) != NULL) {
// Check if we have a media string
if (!strncmp(line, "m=", 2)) {
if (sscanf(line, "m=%s %hu RTP/%*s %u", media_type, &dst.port, &media_fmt_pref) == 3
|| sscanf(line, "m=%s %hu UDP/%*s %u", media_type, &dst.port, &media_fmt_pref) == 3) {
// Add streams from previous 'm=' line to the call
ADD_STREAM(msg_rtp_stream);
ADD_STREAM(rtp_stream);
ADD_STREAM(rtcp_stream);
// Create a new media structure for this message
if ((media = media_create(msg))) {
media_set_type(media, media_type);
media_set_address(media, dst);
media_set_prefered_format(media, media_fmt_pref);
msg_add_media(msg, media);
/**
* From SDP we can only guess destination address port. RTP Capture proccess
* will determine when the stream has been completed, getting source address
* and port of the stream.
*/
// Create a new stream with this destination address:port
// Create RTP stream with source of message as destination address
msg_rtp_stream = stream_create(media, dst, PACKET_RTP);
msg_rtp_stream->dst = msg->packet->src;
msg_rtp_stream->dst.port = dst.port;
// Create RTP stream
rtp_stream = stream_create(media, dst, PACKET_RTP);
// Create RTCP stream
rtcp_stream = stream_create(media, dst, PACKET_RTCP);
rtcp_stream->dst.port++;
}
}
}
// Check if we have a connection string
if (!strncmp(line, "c=", 2)) {
if (sscanf(line, "c=IN IP4 %s", dst.ip) && media) {
media_set_address(media, dst);
strcpy(rtp_stream->dst.ip, dst.ip);
strcpy(rtcp_stream->dst.ip, dst.ip);
}
}
// Check if we have attribute format string
if (!strncmp(line, "a=rtpmap:", 9)) {
if (media && sscanf(line, "a=rtpmap:%u %[^ ]", &media_fmt_code, media_format)) {
media_add_format(media, media_fmt_code, media_format);
}
}
// Check if we have attribute format RTCP port
if (!strncmp(line, "a=rtcp:", 7) && rtcp_stream) {
sscanf(line, "a=rtcp:%hu", &rtcp_stream->dst.port);
}
}
// Add streams from last 'm=' line to the call
ADD_STREAM(msg_rtp_stream);
ADD_STREAM(rtp_stream);
ADD_STREAM(rtcp_stream);
sng_free(tofree);
#undef ADD_STREAM
}
