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sdp.c
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/*! \file sdp.c
* \author Lorenzo Miniero <lorenzo@meetecho.com>
* \copyright GNU General Public License v3
* \brief SDP processing
* \details Implementation (based on the Sofia-SDP stack) of the SDP
* parser/merger/generator in the gateway. Each SDP coming from peers is
* stripped/anonymized before it is passed to the plugins: all
* DTLS/ICE/transport related information is removed, only leaving the
* relevant information in place. SDP coming from plugins is stripped/anonymized
* as well, and merged with the proper DTLS/ICE/transport information before
* it is sent to the peers.
*
* \ingroup protocols
* \ref protocols
*/
#include "janus.h"
#include "ice.h"
#include "dtls.h"
#include "sdp.h"
#include "utils.h"
#include "debug.h"
static su_home_t *home = NULL;
/* SDP Initialization */
int janus_sdp_init(void) {
home = su_home_new(sizeof(su_home_t));
if(su_home_init(home) < 0) {
JANUS_LOG(LOG_FATAL, "Ops, error setting up sofia-sdp?\n");
return -1;
}
return 0;
}
void janus_sdp_deinit(void) {
su_home_deinit(home);
su_home_unref(home);
home = NULL;
}
/* Fake attribute we use for the sendrecv hack */
static sdp_attribute_t fakedir = {
.a_size = sizeof(sdp_attribute_t),
.a_name = "jfmod",
.a_value = "sr"
};
/* SDP parser */
void janus_sdp_free(janus_sdp *sdp) {
if(!sdp)
return;
sdp_parser_t *parser = (sdp_parser_t *)sdp->parser;
if(parser)
sdp_parser_free(parser);
sdp->parser = NULL;
sdp->sdp = NULL;
g_free(sdp);
sdp = NULL;
}
/* Pre-parse SDP: is this SDP valid? how many audio/video lines? any features to take into account? */
janus_sdp *janus_sdp_preparse(const char *jsep_sdp, int *audio, int *video, int *data, int *bundle, int *rtcpmux, int *trickle) {
if(!jsep_sdp || !audio || !video || !data || !bundle || !rtcpmux || !trickle) {
JANUS_LOG(LOG_ERR, " Can't preparse, invalid arduments\n");
return NULL;
}
sdp_parser_t *parser = sdp_parse(home, jsep_sdp, strlen(jsep_sdp), 0);
sdp_session_t *parsed_sdp = sdp_session(parser);
if(!parsed_sdp) {
JANUS_LOG(LOG_ERR, " Error parsing SDP? %s\n", sdp_parsing_error(parser));
sdp_parser_free(parser);
/* Invalid SDP */
return NULL;
}
sdp_media_t *m = parsed_sdp->sdp_media;
while(m) {
if(m->m_type == sdp_media_audio && m->m_port > 0) {
*audio = *audio + 1;
} else if(m->m_type == sdp_media_video && m->m_port > 0) {
*video = *video + 1;
}
m = m->m_next;
}
#ifdef HAVE_SCTP
*data = (strstr(jsep_sdp, "DTLS/SCTP") && !strstr(jsep_sdp, " 0 DTLS/SCTP")) ? 1 : 0; /* FIXME This is a really hacky way of checking... */
#else
*data = 0;
#endif
*bundle = strstr(jsep_sdp, "a=group:BUNDLE") ? 1 : 0; /* FIXME This is a really hacky way of checking... */
*rtcpmux = strstr(jsep_sdp, "a=rtcp-mux") ? 1 : 0; /* FIXME Should we make this check per-medium? */
//~ *trickle = (strstr(jsep_sdp, "trickle") || strstr(jsep_sdp, "google-ice") || strstr(jsep_sdp, "Mozilla")) ? 1 : 0; /* FIXME This is a really hacky way of checking... */
/* FIXME We're assuming trickle is always supported, see https://github.com/meetecho/janus-gateway/issues/83 */
*trickle = 1;
janus_sdp *sdp = (janus_sdp *)g_malloc0(sizeof(janus_sdp));
if(sdp == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
sdp->parser = parser;
sdp->sdp = parsed_sdp;
return sdp;
}
/* Parse SDP */
int janus_sdp_parse(janus_ice_handle *handle, janus_sdp *sdp) {
if(!handle || !sdp)
return -1;
sdp_session_t *remote_sdp = (sdp_session_t *)sdp->sdp;
if(!remote_sdp)
return -1;
janus_ice_stream *stream = NULL;
gchar *ruser = NULL, *rpass = NULL, *rhashing = NULL, *rfingerprint = NULL;
int audio = 0, video = 0;
#ifdef HAVE_SCTP
int data = 0;
#endif
/* Ok, let's start */
sdp_attribute_t *a = remote_sdp->sdp_attributes;
while(a) {
if(a->a_name) {
if(!strcasecmp(a->a_name, "fingerprint")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Fingerprint (global) : %s\n", handle->handle_id, a->a_value);
if(strcasestr(a->a_value, "sha-256 ") == a->a_value) {
rhashing = g_strdup("sha-256");
rfingerprint = g_strdup(a->a_value + strlen("sha-256 "));
} else if(strcasestr(a->a_value, "sha-1 ") == a->a_value) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-1 instead of sha-256), but that's ok\n", handle->handle_id);
rhashing = g_strdup("sha-1");
rfingerprint = g_strdup(a->a_value + strlen("sha-1 "));
} else {
/* FIXME We should handle this somehow anyway... OpenSSL supports them all */
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-256/sha-1), *NOT* cool\n", handle->handle_id);
}
} else if(!strcasecmp(a->a_name, "ice-ufrag")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE ufrag (global): %s\n", handle->handle_id, a->a_value);
ruser = g_strdup(a->a_value);
} else if(!strcasecmp(a->a_name, "ice-pwd")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE pwd (global): %s\n", handle->handle_id, a->a_value);
rpass = g_strdup(a->a_value);
}
}
a = a->a_next;
}
sdp_media_t *m = remote_sdp->sdp_media;
while(m) {
/* What media type is this? */
stream = NULL;
if(m->m_type == sdp_media_audio) {
if(handle->rtp_profile == NULL && m->m_proto_name != NULL)
handle->rtp_profile = g_strdup(m->m_proto_name);
if(m->m_port > 0) {
audio++;
if(audio > 1) {
m = m->m_next;
continue;
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing audio candidates (stream=%d)...\n", handle->handle_id, handle->audio_id);
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(handle->audio_id));
} else {
/* Audio rejected? */
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_AUDIO);
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Audio rejected by peer...\n", handle->handle_id);
}
} else if(m->m_type == sdp_media_video) {
if(handle->rtp_profile == NULL && m->m_proto_name != NULL)
handle->rtp_profile = g_strdup(m->m_proto_name);
if(m->m_port > 0) {
video++;
if(video > 1) {
m = m->m_next;
continue;
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing video candidates (stream=%d)...\n", handle->handle_id, handle->video_id);
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE)) {
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(handle->video_id));
} else {
gint id = handle->audio_id > 0 ? handle->audio_id : handle->video_id;
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(id));
}
} else {
/* Video rejected? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Video rejected by peer...\n", handle->handle_id);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_VIDEO);
}
#ifdef HAVE_SCTP
} else if(m->m_type == sdp_media_application) {
/* Is this SCTP for DataChannels? */
if(m->m_proto_name != NULL && !strcasecmp(m->m_proto_name, "DTLS/SCTP")) {
if(m->m_port > 0) {
/* Yep */
data++;
if(data > 1) {
m = m->m_next;
continue;
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing SCTP candidates (stream=%d)...\n", handle->handle_id, handle->video_id);
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE)) {
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(handle->data_id));
} else {
gint id = handle->audio_id > 0 ? handle->audio_id : (handle->video_id > 0 ? handle->video_id : handle->data_id);
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(id));
}
if(stream == NULL) {
JANUS_LOG(LOG_WARN, "No valid stream for data??\n");
continue;
}
}
} else {
/* Data channels rejected? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Data channels rejected by peer...\n", handle->handle_id);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_DATA_CHANNELS);
}
#endif
} else {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping disabled/unsupported media line...\n", handle->handle_id);
}
if(stream == NULL) {
m = m->m_next;
continue;
}
/* Look for mid, ICE credentials and fingerprint first: check media attributes */
a = m->m_attributes;
while(a) {
if(a->a_name) {
if(!strcasecmp(a->a_name, "mid")) {
/* Found mid attribute */
if(m->m_type == sdp_media_audio && m->m_port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Audio mid: %s\n", handle->handle_id, a->a_value);
handle->audio_mid = g_strdup(a->a_value);
} else if(m->m_type == sdp_media_video && m->m_port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Video mid: %s\n", handle->handle_id, a->a_value);
handle->video_mid = g_strdup(a->a_value);
#ifdef HAVE_SCTP
} else if(m->m_type == sdp_media_application) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Data Channel mid: %s\n", handle->handle_id, a->a_value);
handle->data_mid = g_strdup(a->a_value);
#endif
}
} else if(!strcasecmp(a->a_name, "fingerprint")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Fingerprint (local) : %s\n", handle->handle_id, a->a_value);
if(strcasestr(a->a_value, "sha-256 ") == a->a_value) {
if(rhashing)
g_free(rhashing); /* FIXME We're overwriting the global one, if any */
rhashing = g_strdup("sha-256");
if(rfingerprint)
g_free(rfingerprint); /* FIXME We're overwriting the global one, if any */
rfingerprint = g_strdup(a->a_value + strlen("sha-256 "));
} else if(strcasestr(a->a_value, "sha-1 ") == a->a_value) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-1 instead of sha-256), but that's ok\n", handle->handle_id);
if(rhashing)
g_free(rhashing); /* FIXME We're overwriting the global one, if any */
rhashing = g_strdup("sha-1");
if(rfingerprint)
g_free(rfingerprint); /* FIXME We're overwriting the global one, if any */
rfingerprint = g_strdup(a->a_value + strlen("sha-1 "));
} else {
/* FIXME We should handle this somehow anyway... OpenSSL supports them all */
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-256), *NOT* cool\n", handle->handle_id);
}
} else if(!strcasecmp(a->a_name, "setup")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] DTLS setup (local): %s\n", handle->handle_id, a->a_value);
if(!strcasecmp(a->a_value, "actpass") || !strcasecmp(a->a_value, "passive"))
stream->dtls_role = JANUS_DTLS_ROLE_CLIENT;
else if(!strcasecmp(a->a_value, "active"))
stream->dtls_role = JANUS_DTLS_ROLE_SERVER;
/* TODO Handle holdconn... */
} else if(!strcasecmp(a->a_name, "ice-ufrag")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE ufrag (local): %s\n", handle->handle_id, a->a_value);
if(ruser)
g_free(ruser); /* FIXME We're overwriting the global one, if any */
ruser = g_strdup(a->a_value);
} else if(!strcasecmp(a->a_name, "ice-pwd")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE pwd (local): %s\n", handle->handle_id, a->a_value);
if(rpass)
g_free(rpass); /* FIXME We're overwriting the global one, if any */
rpass = g_strdup(a->a_value);
}
}
a = a->a_next;
}
if(!ruser || !rpass || !rfingerprint || !rhashing) {
/* Missing mandatory information, failure... */
if(ruser)
g_free(ruser);
ruser = NULL;
if(rpass)
g_free(rpass);
rpass = NULL;
if(rhashing)
g_free(rhashing);
rhashing = NULL;
if(rfingerprint)
g_free(rfingerprint);
rfingerprint = NULL;
return -2;
}
/* FIXME We're replacing the fingerprint info, assuming it's going to be the same for all media */
if(stream->remote_hashing != NULL)
g_free(stream->remote_hashing);
stream->remote_hashing = g_strdup(rhashing);
if(stream->remote_fingerprint != NULL)
g_free(stream->remote_fingerprint);
stream->remote_fingerprint = g_strdup(rfingerprint);
/* Store the ICE username and password for this stream */
if(stream->ruser != NULL)
g_free(stream->ruser);
stream->ruser = g_strdup(ruser);
if(stream->rpass != NULL)
g_free(stream->rpass);
stream->rpass = g_strdup(rpass);
/* Now look for candidates and other info */
a = m->m_attributes;
while(a) {
if(a->a_name) {
if(!strcasecmp(a->a_name, "candidate")) {
if(m->m_type == sdp_media_video && handle->audio_id > 0 && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] This is a video candidate but we're bundling, ignoring...\n", handle->handle_id);
#ifdef HAVE_SCTP
} else if(m->m_type == sdp_media_application && (handle->audio_id > 0 || handle->video_id > 0) && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] This is a SCTP candidate but we're bundling, ignoring...\n", handle->handle_id);
#endif
} else {
int res = janus_sdp_parse_candidate(stream, (const char *)a->a_value, 0);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse candidate... (%d)\n", handle->handle_id, res);
}
}
}
if(!strcasecmp(a->a_name, "ssrc")) {
int res = janus_sdp_parse_ssrc(stream, (const char *)a->a_value, m->m_type == sdp_media_video);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse SSRC attribute... (%d)\n", handle->handle_id, res);
}
}
#ifdef HAVE_SCTP
if(!strcasecmp(a->a_name, "sctpmap")) {
/* TODO Parse sctpmap line to get the UDP-port value and the number of channels */
JANUS_LOG(LOG_VERB, "Got a sctpmap attribute: %s\n", a->a_value);
}
#endif
}
a = a->a_next;
}
m = m->m_next;
}
if(ruser)
g_free(ruser);
ruser = NULL;
if(rpass)
g_free(rpass);
rpass = NULL;
if(rhashing)
g_free(rhashing);
rhashing = NULL;
if(rfingerprint)
g_free(rfingerprint);
rfingerprint = NULL;
return 0; /* FIXME Handle errors better */
}
int janus_sdp_parse_candidate(janus_ice_stream *stream, const char *candidate, int trickle) {
if(stream == NULL || candidate == NULL)
return -1;
janus_ice_handle *handle = stream->handle;
if(handle == NULL)
return -2;
janus_ice_component *component = NULL;
if(strstr(candidate, "end-of-candidates")) {
/* FIXME Should we do something with this? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] end-of-candidates received\n", handle->handle_id);
return 0;
}
if(strstr(candidate, "candidate:") == candidate) {
/* Skipping the 'candidate:' prefix Firefox puts in trickle candidates */
candidate += strlen("candidate:");
}
char rfoundation[32], rtransport[4], rip[40], rtype[6], rrelip[40];
guint32 rcomponent, rpriority, rport, rrelport;
int res = sscanf(candidate, "%31s %30u %3s %30u %39s %30u typ %5s %*s %39s %*s %30u",
rfoundation, &rcomponent, rtransport, &rpriority,
rip, &rport, rtype, rrelip, &rrelport);
if(res < 7) {
/* Failed to parse this address, can it be IPv6? */
if(!janus_ice_is_ipv6_enabled()) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Received IPv6 candidate, but IPv6 support is disabled...\n", handle->handle_id);
return res;
}
}
if(res >= 7) {
/* Add remote candidate */
component = g_hash_table_lookup(stream->components, GUINT_TO_POINTER(rcomponent));
if(component == NULL) {
if(rcomponent == 2 && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_RTCPMUX)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Skipping component %d in stream %d (rtcp-muxing)\n", handle->handle_id, rcomponent, stream->stream_id);
} else {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] -- No such component %d in stream %d?\n", handle->handle_id, rcomponent, stream->stream_id);
}
} else {
if(rcomponent == 2 && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_RTCPMUX)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Skipping component %d in stream %d (rtcp-muxing)\n", handle->handle_id, rcomponent, stream->stream_id);
return 0;
}
//~ if(trickle) {
//~ if(component->dtls != NULL) {
//~ /* This component is already ready, ignore this further candidate */
//~ JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Ignoring this candidate, the component is already ready\n", handle->handle_id);
//~ return 0;
//~ }
//~ }
component->component_id = rcomponent;
component->stream_id = stream->stream_id;
NiceCandidate *c = NULL;
if(!strcasecmp(rtype, "host")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:host %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_HOST);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_HOST);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "srflx")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:srflx %s:%d --> %s:%d \n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "prflx")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:prflx %s:%d --> %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_PEER_REFLEXIVE);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_PEER_REFLEXIVE);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "relay")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:relay %s:%d --> %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* We only support UDP/TCP/TLS... */
if(strcasecmp(rtransport, "udp") && strcasecmp(rtransport, "tcp") && strcasecmp(rtransport, "tls")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
} else {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_RELAYED);
}
} else {
/* FIXME What now? */
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Unknown remote candidate type:%s for component:%d stream:%d!\n",
handle->handle_id, rtype, rcomponent, stream->stream_id);
}
if(c != NULL) {
c->component_id = rcomponent;
c->stream_id = stream->stream_id;
#ifndef HAVE_LIBNICE_TCP
c->transport = NICE_CANDIDATE_TRANSPORT_UDP;
#else
if(!strcasecmp(rtransport, "udp")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Transport: UDP\n", handle->handle_id);
c->transport = NICE_CANDIDATE_TRANSPORT_UDP;
} else {
/* Check the type (https://tools.ietf.org/html/rfc6544#section-4.5) */
const char *type = NULL;
int ctype = 0;
if(strstr(candidate, "tcptype active")) {
type = "active";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_ACTIVE;
} else if(strstr(candidate, "tcptype passive")) {
type = "passive";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_PASSIVE;
} else if(strstr(candidate, "tcptype so")) {
type = "so";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_SO;
} else {
/* TODO: We should actually stop here... */
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Missing tcptype info for the TCP candidate!\n", handle->handle_id);
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Transport: TCP (%s)\n", handle->handle_id, type);
c->transport = ctype;
}
#endif
strncpy(c->foundation, rfoundation, NICE_CANDIDATE_MAX_FOUNDATION);
c->priority = rpriority;
nice_address_set_from_string(&c->addr, rip);
nice_address_set_port(&c->addr, rport);
c->username = g_strdup(stream->ruser);
c->password = g_strdup(stream->rpass);
if(c->type == NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE || c->type == NICE_CANDIDATE_TYPE_PEER_REFLEXIVE) {
nice_address_set_from_string(&c->base_addr, rrelip);
nice_address_set_port(&c->base_addr, rrelport);
} else if(c->type == NICE_CANDIDATE_TYPE_RELAYED) {
/* FIXME Do we really need the base address for TURN? */
nice_address_set_from_string(&c->base_addr, rrelip);
nice_address_set_port(&c->base_addr, rrelport);
}
component->candidates = g_slist_append(component->candidates, c);
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Candidate added to the list! (%u elements for %d/%d)\n", handle->handle_id,
g_slist_length(component->candidates), stream->stream_id, component->component_id);
/* Save for the summary, in case we need it */
component->remote_candidates = g_slist_append(component->remote_candidates, g_strdup(candidate));
if(trickle) {
if(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_START)) {
/* This is a trickle candidate and ICE has started, we should process it right away */
if(!component->process_started) {
/* Actually, ICE has JUST started for this component, take care of the candidates we've added so far */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE already started for this component, setting candidates we have up to now\n", handle->handle_id);
janus_ice_setup_remote_candidates(handle, component->stream_id, component->component_id);
} else {
GSList *candidates = NULL;
candidates = g_slist_append(candidates, c);
if(nice_agent_set_remote_candidates(handle->agent, stream->stream_id, component->component_id, candidates) < 1) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to add trickle candidate :-(\n", handle->handle_id);
} else {
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Trickle candidate added!\n", handle->handle_id);
}
g_slist_free(candidates);
}
} else {
/* ICE hasn't started yet: to make sure we're not stuck, also check if we stopped processing the SDP */
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER)) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_START);
/* This is a trickle candidate and ICE has started, we should process it right away */
if(!component->process_started) {
/* Actually, ICE has JUST started for this component, take care of the candidates we've added so far */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] SDP processed but ICE not started yet for this component, setting candidates we have up to now\n", handle->handle_id);
janus_ice_setup_remote_candidates(handle, component->stream_id, component->component_id);
} else {
GSList *candidates = NULL;
candidates = g_slist_append(candidates, c);
if(nice_agent_set_remote_candidates(handle->agent, stream->stream_id, component->component_id, candidates) < 1) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to add trickle candidate :-(\n", handle->handle_id);
} else {
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Trickle candidate added!\n", handle->handle_id);
}
g_slist_free(candidates);
}
} else {
/* Still processing the offer/answer: queue the trickle candidate for now, we'll process it later */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Queueing trickle candidate, status is not START yet\n", handle->handle_id);
}
}
}
}
}
} else {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse candidate (res=%d)...\n", handle->handle_id, res);
return res;
}
return 0;
}
int janus_sdp_parse_ssrc(janus_ice_stream *stream, const char *ssrc_attr, int video) {
if(stream == NULL || ssrc_attr == NULL)
return -1;
janus_ice_handle *handle = stream->handle;
if(handle == NULL)
return -2;
guint32 ssrc = atol(ssrc_attr);
if(ssrc == 0)
return -3;
if(video) {
if(stream->video_ssrc_peer == 0) {
stream->video_ssrc_peer = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC: %u\n", handle->handle_id, stream->video_ssrc_peer);
} else if(stream->video_ssrc_peer != ssrc) {
/* FIXME We assume the second SSRC we get is the one Chrome associates with retransmissions, e.g.
* a=ssrc-group:FID 586466331 2053167359 (SSRC SSRC-rtx)
* SSRC group FID: https://tools.ietf.org/html/rfc3388#section-7 */
stream->video_ssrc_peer_rtx = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC (rtx): %u\n", handle->handle_id, stream->video_ssrc_peer_rtx);
}
} else {
if(stream->audio_ssrc_peer == 0) {
stream->audio_ssrc_peer = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer audio SSRC: %u\n", handle->handle_id, stream->audio_ssrc_peer);
}
}
return 0;
}
char *janus_sdp_anonymize(const char *sdp) {
if(sdp == NULL)
return NULL;
sdp_session_t *anon = NULL;
sdp_parser_t *parser = sdp_parse(home, sdp, strlen(sdp), 0);
if(!(anon = sdp_session(parser))) {
JANUS_LOG(LOG_ERR, "Error parsing/merging SDP: %s\n", sdp_parsing_error(parser));
sdp_parser_free(parser);
return NULL;
}
/* c= */
if(anon->sdp_connection && anon->sdp_connection->c_address) {
anon->sdp_connection->c_address = "1.1.1.1";
}
/* a= */
if(anon->sdp_attributes) {
/* These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(anon->sdp_attributes, "ice-ufrag"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-ufrag");
while(sdp_attribute_find(anon->sdp_attributes, "ice-pwd"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-pwd");
while(sdp_attribute_find(anon->sdp_attributes, "ice-options"))
sdp_attribute_remove(&anon->sdp_attributes, "ice-options");
while(sdp_attribute_find(anon->sdp_attributes, "fingerprint"))
sdp_attribute_remove(&anon->sdp_attributes, "fingerprint");
while(sdp_attribute_find(anon->sdp_attributes, "group"))
sdp_attribute_remove(&anon->sdp_attributes, "group");
while(sdp_attribute_find(anon->sdp_attributes, "msid-semantic"))
sdp_attribute_remove(&anon->sdp_attributes, "msid-semantic");
while(sdp_attribute_find(anon->sdp_attributes, "rtcp-rsize"))
sdp_attribute_remove(&anon->sdp_attributes, "rtcp-rsize");
}
/* m= */
if(anon->sdp_media) {
int audio = 0, video = 0, data = 0;
sdp_media_t *m = anon->sdp_media;
while(m) {
if(m->m_type == sdp_media_audio && m->m_port > 0) {
audio++;
m->m_port = audio == 1 ? 1 : 0;
} else if(m->m_type == sdp_media_video && m->m_port > 0) {
video++;
m->m_port = video == 1 ? 1 : 0;
} else if(m->m_type == sdp_media_application) {
if(m->m_proto_name != NULL && !strcasecmp(m->m_proto_name, "DTLS/SCTP") && m->m_port != 0) {
data++;
m->m_port = data == 1 ? 1 : 0;
} else {
m->m_port = 0;
}
} else {
m->m_port = 0;
}
/* c= */
if(m->m_connections) {
sdp_connection_t *c = m->m_connections;
while(c) {
if(c->c_address) {
c->c_address = "1.1.1.1";
}
c = c->c_next;
}
}
/* a= */
if(m->m_attributes) {
/* These are attributes we handle ourselves, the plugins don't need them */
while(sdp_attribute_find(m->m_attributes, "ice-ufrag"))
sdp_attribute_remove(&m->m_attributes, "ice-ufrag");
while(sdp_attribute_find(m->m_attributes, "ice-pwd"))
sdp_attribute_remove(&m->m_attributes, "ice-pwd");
while(sdp_attribute_find(m->m_attributes, "ice-options"))
sdp_attribute_remove(&m->m_attributes, "ice-options");
while(sdp_attribute_find(m->m_attributes, "crypto"))
sdp_attribute_remove(&m->m_attributes, "crypto");
while(sdp_attribute_find(m->m_attributes, "fingerprint"))
sdp_attribute_remove(&m->m_attributes, "fingerprint");
while(sdp_attribute_find(m->m_attributes, "setup"))
sdp_attribute_remove(&m->m_attributes, "setup");
while(sdp_attribute_find(m->m_attributes, "connection"))
sdp_attribute_remove(&m->m_attributes, "connection");
while(sdp_attribute_find(m->m_attributes, "group"))
sdp_attribute_remove(&m->m_attributes, "group");
while(sdp_attribute_find(m->m_attributes, "mid"))
sdp_attribute_remove(&m->m_attributes, "mid");
while(sdp_attribute_find(m->m_attributes, "msid"))
sdp_attribute_remove(&m->m_attributes, "msid");
while(sdp_attribute_find(m->m_attributes, "msid-semantic"))
sdp_attribute_remove(&m->m_attributes, "msid-semantic");
while(sdp_attribute_find(m->m_attributes, "rtcp"))
sdp_attribute_remove(&m->m_attributes, "rtcp");
while(sdp_attribute_find(m->m_attributes, "rtcp-mux"))
sdp_attribute_remove(&m->m_attributes, "rtcp-mux");
while(sdp_attribute_find(m->m_attributes, "rtcp-rsize"))
sdp_attribute_remove(&m->m_attributes, "rtcp-rsize");
while(sdp_attribute_find(m->m_attributes, "candidate"))
sdp_attribute_remove(&m->m_attributes, "candidate");
while(sdp_attribute_find(m->m_attributes, "ssrc"))
sdp_attribute_remove(&m->m_attributes, "ssrc");
while(sdp_attribute_find(m->m_attributes, "ssrc-group"))
sdp_attribute_remove(&m->m_attributes, "ssrc-group");
while(sdp_attribute_find(m->m_attributes, "extmap")) /* TODO Actually implement RTP extensions */
sdp_attribute_remove(&m->m_attributes, "extmap");
while(sdp_attribute_find(m->m_attributes, "sctpmap"))
sdp_attribute_remove(&m->m_attributes, "sctpmap");
/* Also remove attributes/formats we know we don't support now */
GList *ptypes = NULL;
sdp_attribute_t *a = m->m_attributes;
while(a) {
if(a->a_value && (strstr(a->a_value, "red/90000") || strstr(a->a_value, "ulpfec/90000") || strstr(a->a_value, "rtx/90000"))) {
int ptype = atoi(a->a_value);
ptypes = g_list_append(ptypes, GINT_TO_POINTER(ptype));
JANUS_LOG(LOG_VERB, "Will remove payload type %d\n", ptype);
}
a = a->a_next;
}
if(ptypes) {
GList *p = ptypes;
while(p) {
int ptype = GPOINTER_TO_INT(p->data);
if(m->m_format) {
sdp_list_t *fmt = m->m_format, *old = NULL;
while(fmt) {
int fmt_pt = atoi(fmt->l_text);
if(fmt_pt == ptype) {
if(!old) {
m->m_format = fmt->l_next;
fmt = m->m_format;
continue;
} else {
old->l_next = fmt->l_next;
fmt = fmt->l_next;
continue;
}
}
old = fmt;
fmt = fmt->l_next;
}
}
a = m->m_attributes;
sdp_attribute_t *old = NULL;
while(a) {
int a_pt = a->a_value ? atoi(a->a_value) : -1;
if(a_pt == ptype) {
if(!old) {
m->m_attributes = a->a_next;
a = m->m_attributes;
continue;
} else {
old->a_next = a->a_next;
a = a->a_next;
continue;
}
}
old = a;
a = a->a_next;
}
p = g_list_remove(p, p->data);
}
}
}
if(m->m_type != sdp_media_application && m->m_mode == sdp_sendrecv) {
/* FIXME sendrecv hack: sofia-sdp doesn't print sendrecv, but we want it to */
sdp_attribute_append(&m->m_attributes, &fakedir);
}
m = m->m_next;
}
}
char buf[JANUS_BUFSIZE];
sdp_printer_t *printer = sdp_print(home, anon, buf, JANUS_BUFSIZE, 0);
if(sdp_message(printer)) {
int retval = sdp_message_size(printer);
sdp_printer_free(printer);
sdp_parser_free(parser);
/* FIXME Take care of the sendrecv hack, if needed */
char *replace = strstr(buf, "a=jfmod:sr");
while(replace != NULL) {
memcpy(replace, "a=sendrecv", strlen("a=sendrecv"));
replace++;
replace = strstr(replace, "a=jfmod:sr");
}
JANUS_LOG(LOG_VERB, " -------------------------------------------\n");
JANUS_LOG(LOG_VERB, " >> Anonymized (%zu --> %d bytes)\n", strlen(sdp), retval);
JANUS_LOG(LOG_VERB, " -------------------------------------------\n");
JANUS_LOG(LOG_VERB, "%s\n", buf);
return g_strdup(buf);
} else {
JANUS_LOG(LOG_ERR, "Error anonymizing SDP: %s\n", sdp_printing_error(printer));
sdp_printer_free(printer);
sdp_parser_free(parser);
return NULL;
}
}
char *janus_sdp_merge(janus_ice_handle *handle, const char *origsdp) {
if(handle == NULL || origsdp == NULL)
return NULL;
sdp_session_t *anon = NULL;
sdp_parser_t *parser = sdp_parse(home, origsdp, strlen(origsdp), 0);
if(!(anon = sdp_session(parser))) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Error parsing/merging SDP: %s\n", handle->handle_id, sdp_parsing_error(parser));
sdp_parser_free(parser);
return NULL;
}
/* Prepare SDP to merge */
gchar buffer[512];
memset(buffer, 0, 512);
char *sdp = (char*)g_malloc0(JANUS_BUFSIZE);
if(sdp == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
sdp_parser_free(parser);
return NULL;
}
sdp[0] = '\0';
char *rtp_profile = handle->rtp_profile ? handle->rtp_profile : (char *)"RTP/SAVPF";
/* FIXME Any Plan B to take into account? */
int planb = strstr(origsdp, "a=planb:") ? 1 : 0;
if(planb) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PLAN_B);
} else {
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PLAN_B);
}
/* Version v= */
g_strlcat(sdp,
"v=0\r\n", JANUS_BUFSIZE);
/* Origin o= */
if(anon->sdp_origin) {
g_snprintf(buffer, 512,
"o=%s %"SCNu64" %"SCNu64" IN IP4 %s\r\n",
anon->sdp_origin->o_username ? anon->sdp_origin->o_username : "-",
anon->sdp_origin->o_id, anon->sdp_origin->o_version,
janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
} else {
gint64 sessid = janus_get_real_time();
gint64 version = sessid; /* FIXME This needs to be increased when it changes, so time should be ok */
g_snprintf(buffer, 512,
"o=%s %"SCNi64" %"SCNi64" IN IP4 %s\r\n",
"-", sessid, version, janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
}
/* Session name s= */
if(anon->sdp_subject && strlen(anon->sdp_subject) > 0) {
g_snprintf(buffer, 512, "s=%s\r\n", anon->sdp_subject);
} else {
g_snprintf(buffer, 512, "s=%s\r\n", "Meetecho Janus");
}
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* Timing t= */
g_snprintf(buffer, 512,
"t=%lu %lu\r\n", anon->sdp_time ? anon->sdp_time->t_start : 0, anon->sdp_time ? anon->sdp_time->t_stop : 0);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* ICE Full or Lite? */
if(janus_ice_is_ice_lite_enabled()) {
/* Janus is acting in ICE Lite mode, advertize this */
g_strlcat(sdp, "a=ice-lite\r\n", JANUS_BUFSIZE);
}
/* bundle: add new global attribute */
int audio = (strstr(origsdp, "m=audio") != NULL);
int video = (strstr(origsdp, "m=video") != NULL);
#ifdef HAVE_SCTP
int data = (strstr(origsdp, "DTLS/SCTP") && !strstr(origsdp, " 0 DTLS/SCTP"));
#else
int data = 0;
#endif
g_strlcat(sdp, "a=group:BUNDLE", JANUS_BUFSIZE);
if(audio) {
g_snprintf(buffer, 512,
" %s", handle->audio_mid ? handle->audio_mid : "audio");
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
}
if(video) {
g_snprintf(buffer, 512,
" %s", handle->video_mid ? handle->video_mid : "video");
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
}
if(data) {
g_snprintf(buffer, 512,
" %s", handle->data_mid ? handle->data_mid : "data");
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
}
g_strlcat(sdp, "\r\n", JANUS_BUFSIZE);
/* msid-semantic: add new global attribute */
g_strlcat(sdp,
"a=msid-semantic: WMS janus\r\n",
JANUS_BUFSIZE);
char wms[JANUS_BUFSIZE];
memset(wms, 0, JANUS_BUFSIZE);
g_strlcat(wms, "WMS", JANUS_BUFSIZE);
/* Copy other global attributes, if any */
if(anon->sdp_attributes) {
sdp_attribute_t *a = anon->sdp_attributes;
while(a) {
if(a->a_value == NULL) {
g_snprintf(buffer, 512,
"a=%s\r\n", a->a_name);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
} else {
g_snprintf(buffer, 512,
"a=%s:%s\r\n", a->a_name, a->a_value);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
}
a = a->a_next;
}
}
gboolean ipv6 = strstr(janus_get_public_ip(), ":") != NULL;
/* Media lines now */
if(anon->sdp_media) {
int audio = 0, video = 0;
#ifdef HAVE_SCTP
int data = 0;
#endif
sdp_media_t *m = anon->sdp_media;
janus_ice_stream *stream = NULL;
while(m) {
if(m->m_type == sdp_media_audio && m->m_port > 0) {
audio++;
if(audio > 1 || !handle->audio_id) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping audio line (we have %d audio lines, and the id is %d)\n", handle->handle_id, audio, handle->audio_id);
g_snprintf(buffer, 512,
"m=audio 0 %s 0\r\n", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* FIXME Adding a c-line anyway because otherwise Firefox complains? ("c= connection line not specified for every media level, validation failed") */
g_snprintf(buffer, 512,
"c=IN %s %s\r\n", ipv6 ? "IP6" : "IP4", janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
g_strlcat(sdp, "a=inactive\r\n", JANUS_BUFSIZE);
m = m->m_next;
continue;
}
/* Audio */
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(handle->audio_id));
if(stream == NULL) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping audio line (invalid stream %d)\n", handle->handle_id, handle->audio_id);
g_snprintf(buffer, 512,
"m=audio 0 %s 0\r\n", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* FIXME Adding a c-line anyway because otherwise Firefox complains? ("c= connection line not specified for every media level, validation failed") */
g_snprintf(buffer, 512,
"c=IN %s %s\r\n", ipv6 ? "IP6" : "IP4", janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
g_strlcat(sdp, "a=inactive\r\n", JANUS_BUFSIZE);
m = m->m_next;
continue;
}
g_snprintf(buffer, 512,
"m=audio 1 %s", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
} else if(m->m_type == sdp_media_video && m->m_port > 0) {
video++;
gint id = handle->video_id;
if(id == 0 && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE))
id = handle->audio_id > 0 ? handle->audio_id : handle->video_id;
if(video > 1 || !id) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping video line (we have %d video lines, and the id is %d)\n", handle->handle_id, video,
janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE) ? handle->audio_id : handle->video_id);
g_snprintf(buffer, 512,
"m=video 0 %s 0\r\n", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* FIXME Adding a c-line anyway because otherwise Firefox complains? ("c= connection line not specified for every media level, validation failed") */
g_snprintf(buffer, 512,
"c=IN %s %s\r\n", ipv6 ? "IP6" : "IP4", janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
g_strlcat(sdp, "a=inactive\r\n", JANUS_BUFSIZE);
m = m->m_next;
continue;
}
/* Video */
stream = g_hash_table_lookup(handle->streams, GUINT_TO_POINTER(id));
if(stream == NULL) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping video line (invalid stream %d)\n", handle->handle_id, id);
g_snprintf(buffer, 512,
"m=video 0 %s 0\r\n", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* FIXME Adding a c-line anyway because otherwise Firefox complains? ("c= connection line not specified for every media level, validation failed") */
g_snprintf(buffer, 512,
"c=IN %s %s\r\n", ipv6 ? "IP6" : "IP4", janus_get_public_ip());
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
g_strlcat(sdp, "a=inactive\r\n", JANUS_BUFSIZE);
m = m->m_next;
continue;
}
g_snprintf(buffer, 512,
"m=video 1 %s", rtp_profile);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
#ifdef HAVE_SCTP
} else if(m->m_type == sdp_media_application) {
/* Is this SCTP for DataChannels? */
if(m->m_port > 0 && m->m_proto_name != NULL && !strcasecmp(m->m_proto_name, "DTLS/SCTP") && m->m_port > 0) {
/* Yep */
data++;
gint id = handle->data_id;
if(id == 0 && janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE))
id = handle->audio_id > 0 ? handle->audio_id : handle->video_id;
if(data > 1 || !id) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping SCTP line (we have %d SCTP lines, and the id is %d)\n", handle->handle_id, data, id);
g_snprintf(buffer, 512,
"m=%s 0 %s 0\r\n",
m->m_type_name, m->m_proto_name);
g_strlcat(sdp, buffer, JANUS_BUFSIZE);
/* FIXME Adding a c-line anyway because otherwise Firefox complains? ("c= connection line not specified for every media level, validation failed") */