int
rtcdc_parse_candidate_sdp(struct rtcdc_peer_connection *peer, const char *candidates)
{
if (peer == NULL || peer->transport == NULL)
return -1;
return parse_remote_candidate_sdp(peer->transport->ice, candidates);
}
int
rtcdc_parse_offer_sdp(struct rtcdc_peer_connection *peer, const char *offer)
{
if (peer == NULL || offer == NULL)
return -1;
if (peer->transport == NULL) {
if (create_rtcdc_transport(peer, RTCDC_PEER_ROLE_CLIENT) < 0)
return -1;
}
char **lines;
lines = g_strsplit(offer, "\r\n", 0);
char buf[BUFFER_SIZE];
memset(buf, 0, sizeof buf);
int pos = 0;
int remote_port = 0;
for (int i = 0; lines && lines[i]; ++i) {
#ifdef LEGACY_SDP
if (g_str_has_prefix(lines[i], "m=application")) {
char **columns = g_strsplit(lines[i], " ", 0);
remote_port = atoi(columns[3]);
#else
if (g_str_has_prefix(lines[i], "a=sctp-port:")) {
char **columns = g_strsplit(lines[i], ":", 0);
remote_port = atoi(columns[1]);
#endif
if (remote_port <= 0)
return -1;
peer->transport->sctp->remote_port = remote_port;
g_strfreev(columns);
} else if (g_str_has_prefix(lines[i], "a=setup:")) {
char **columns = g_strsplit(lines[i], ":", 0);
if (strcmp(columns[1], "active") == 0 && peer->role == RTCDC_PEER_ROLE_CLIENT) {
peer->role = RTCDC_PEER_ROLE_SERVER;
} else if (strcmp(columns[1], "passive") == 0 && peer->role == RTCDC_PEER_ROLE_SERVER) {
//peer->role = RTCDC_PEER_ROLE_CLIENT;
peer->role = RTCDC_PEER_ROLE_SERVER;
} else { // actpass
// nothing to do
}
g_strfreev(columns);
}
pos += sprintf(buf + pos, "%s\n", lines[i]);
}
g_strfreev(lines);
return parse_remote_sdp(peer->transport->ice, buf);
}
int
rtcdc_parse_candidate_sdp(struct rtcdc_peer_connection *peer, const char *candidates)
{
if (peer == NULL || peer->transport == NULL)
return -1;
return parse_remote_candidate_sdp(peer->transport->ice, candidates);
}
struct rtcdc_data_channel *
rtcdc_create_data_channel(struct rtcdc_peer_connection *peer,
const char *label, const char *protocol,
rtcdc_on_open_cb on_open,
rtcdc_on_message_cb on_message,
rtcdc_on_close_cb on_close,
void *user_data)
{
if (peer == NULL || peer->transport == NULL)
return NULL;
struct rtcdc_transport *transport = peer->transport;
struct sctp_transport *sctp = transport->sctp;
int i;
for (i = 0; i < RTCDC_MAX_CHANNEL_NUM; ++i) {
if (peer->channels[i])
continue;
break;
}
if (i == RTCDC_MAX_CHANNEL_NUM)
return NULL;
struct rtcdc_data_channel *ch = (struct rtcdc_data_channel *)calloc(1, sizeof *ch);
if (ch == NULL)
return NULL;
ch->on_open = on_open;
ch->on_message = on_message;
ch->on_close = on_close;
ch->user_data = user_data;
ch->sctp = sctp;
struct dcep_open_message *req;
int rlen = sizeof *req + strlen(label) + strlen(protocol);
req = (struct dcep_open_message *)calloc(1, rlen);
if (req == NULL)
goto open_channel_err;
ch->type = DATA_CHANNEL_RELIABLE;
ch->state = RTCDC_CHANNEL_STATE_CONNECTING;
if (label)
ch->label = strdup(label);
if (protocol)
ch->protocol = strdup(protocol);
ch->sid = sctp->stream_cursor;
sctp->stream_cursor += 2;
req->message_type = DATA_CHANNEL_OPEN;
req->channel_type = ch->type;
req->priority = htons(0);
req->reliability_param = htonl(0);
if (label)
req->label_length = htons(strlen(label));
if (protocol)
req->protocol_length = htons(strlen(protocol));
memcpy(req->label_and_protocol, label, strlen(label));
memcpy(req->label_and_protocol + strlen(label), protocol, strlen(protocol));
int ret = send_sctp_message(sctp, req, rlen, ch->sid, WEBRTC_CONTROL_PPID);
free(req);
if (ret < 0)
goto open_channel_err;
if (0) {
open_channel_err:
free(ch);
ch = NULL;
}
peer->channels[i] = ch;
return ch;
}
void
rtcdc_destroy_data_channel(struct rtcdc_data_channel *channel)
{
if (channel == NULL)
return;
// todo: close channel
if (channel->label)
free(channel->label);
if (channel->protocol)
free(channel->protocol);
}
int
rtcdc_send_message(struct rtcdc_data_channel *channel, int datatype, void *data, size_t len)
{
if (channel == NULL)
return -1;
int ppid;
if (datatype == RTCDC_DATATYPE_STRING) {
if (data == NULL || len == 0)
ppid = WEBRTC_STRING_EMPTY_PPID;
else
ppid = WEBRTC_STRING_PPID;
} else if (datatype == RTCDC_DATATYPE_BINARY) {
if (data == NULL || len == 0)
ppid = WEBRTC_BINARY_EMPTY_PPID;
else
ppid = WEBRTC_BINARY_PPID;
} else
return -1;
return send_sctp_message(channel->sctp, data, len, channel->sid, ppid);
}
static gpointer
startup_thread(gpointer user_data)
{
struct rtcdc_peer_connection *peer = (struct rtcdc_peer_connection *)user_data;
struct rtcdc_transport *transport = peer->transport;
struct ice_transport *ice = transport->ice;
struct dtls_transport *dtls = transport->dtls;
struct sctp_transport *sctp = transport->sctp;
while (!peer->exit_thread && !ice->negotiation_done)
g_usleep(2500);
if (peer->exit_thread)
return NULL;
#ifdef DEBUG_SCTP
fprintf(stderr, "ICE negotiation done\n");
#endif
if (peer->role == RTCDC_PEER_ROLE_CLIENT)
SSL_set_connect_state(dtls->ssl);
else
SSL_set_accept_state(dtls->ssl);
SSL_do_handshake(dtls->ssl);
while (!peer->exit_thread && !dtls->handshake_done)
g_usleep(2500);
if (peer->exit_thread)
return NULL;
#ifdef DEBUG_SCTP
fprintf(stderr, "DTLS handshake done\n");
#endif
if (peer->role == RTCDC_PEER_ROLE_CLIENT) {
sctp->stream_cursor = 0; // use even streams
struct sockaddr_conn sconn;
memset(&sconn, 0, sizeof sconn);
sconn.sconn_family = AF_CONN;
sconn.sconn_port = htons(sctp->remote_port);
sconn.sconn_addr = (void *)sctp;
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
sconn.sconn_len = sizeof *sctp;
#endif
fprintf(stderr, "usrsctp_connect ... \n");
if (usrsctp_connect(sctp->sock, (struct sockaddr *)&sconn, sizeof sconn) < 0) {
#ifdef DEBUG_SCTP
fprintf(stderr, "SCTP connection failed\n");
#endif
} else {
#ifdef DEBUG_SCTP
fprintf(stderr, "SCTP connected\n");
#endif
sctp->handshake_done = TRUE;
if (peer->on_connect)
peer->on_connect(peer, peer->user_data);
}
} else {
sctp->stream_cursor = 1; // use odd streams
struct sockaddr_conn sconn;
memset(&sconn, 0, sizeof sconn);
sconn.sconn_family = AF_CONN;
sconn.sconn_port = htons(sctp->local_port);
sconn.sconn_addr = (void *)sctp;
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
sconn.sconn_len = sizeof *sctp;
#endif
usrsctp_listen(sctp->sock, 1);
socklen_t len = sizeof sconn;
fprintf(stderr, "usrsctp_accept ... \n");
struct socket *s = usrsctp_accept(sctp->sock, (struct sockaddr *)&sconn, &len);
if (s) {
#ifdef DEBUG_SCTP
fprintf(stderr, "SCTP accepted\n");
#endif
sctp->handshake_done = TRUE;
struct socket *t = sctp->sock;
sctp->sock = s;
usrsctp_close(t);
if (peer->on_connect)
peer->on_connect(peer, peer->user_data);
} else {
#ifdef DEBUG_SCTP
fprintf(stderr, "SCTP acception failed\n");
#endif
}
}
return NULL;
}
void
rtcdc_loop(struct rtcdc_peer_connection *peer)
{
if (peer == NULL)
return;
while (!peer->initialized)
g_usleep(50000);
GThread *thread_ice = g_thread_new("ICE thread", &ice_thread, peer);
GThread *thread_sctp = g_thread_new("SCTP thread", &sctp_thread, peer);
GThread *thread_startup = g_thread_new("Startup thread", &startup_thread, peer);
struct ice_transport *ice = peer->transport->ice;
g_main_loop_run(ice->loop);
peer->exit_thread = TRUE;
g_thread_join(thread_ice);
g_thread_join(thread_sctp);
g_thread_join(thread_startup);
g_thread_unref(thread_ice);
g_thread_unref(thread_sctp);
g_thread_unref(thread_startup);
}
