static enum proto_parse_status sdp_parse(struct parser *parser, struct proto_layer *parent, unsigned way, uint8_t const *packet, size_t cap_len, size_t wire_len, struct timeval const *now, proto_okfn_t *okfn)
{
struct sdp_parser *sdp_parser = DOWNCAST(parser, parser, sdp_parser);
static struct sdper_field const fields[] = {
{ 1, "c", sdp_extract_host },
{ 1, "m", sdp_extract_port },
};
static struct sdper const sdper = {
.nb_fields = NB_ELEMS(fields),
.fields = fields
};
SLOG(LOG_DEBUG, "Starting SDP analysis");
/* Parse */
struct sdp_proto_info info;
sdp_proto_info_ctor(&info, wire_len, 0);
struct proto_layer layer;
proto_layer_ctor(&layer, parent, parser, &info.info);
if (0 != sdper_parse(&sdper, &cap_len, packet, cap_len, &info)) return PROTO_PARSE_ERR;
if (
(info.set_values & SDP_PORT_SET) &&
(info.set_values & SDP_HOST_SET)
) {
SLOG(LOG_DEBUG, "SDP@%p, connect info is %s:%"PRIu16, sdp_parser, ip_addr_2_str(&info.host), info.port);
if (! sdp_parser->host_set) {
sdp_parser->host_set = true;
sdp_parser->host = info.host;
sdp_parser->port = info.port;
ASSIGN_LAYER_AND_INFO_OPT(ip, parent);
if (layer_ip) {
sdp_parser->sender = ip->key.addr[0];
sdp_parser->sender_set = true;
} else {
sdp_parser->sender_set = false;
}
} else if (0 != ip_addr_cmp(&sdp_parser->host, &info.host)) {
// Start conntracking between the advertized hosts
spawn_subparsers(&sdp_parser->host, sdp_parser->port, &info.host, info.port, parent, now);
ASSIGN_LAYER_AND_INFO_OPT(ip, parent);
bool may_use_stun[2] = {
0 != ip_addr_cmp(&sdp_parser->sender, &sdp_parser->host),
ip && 0 != ip_addr_cmp(&ip->key.addr[0], &info.host),
};
// If the sender IP was different from the advertized host, start conntracking on this socket also
if (may_use_stun[0]) {
spawn_subparsers(&sdp_parser->sender, sdp_parser->port, &info.host, info.port, parent, now);
}
// If _this_ sender IP is different from this advertized host, start conntracking on this socket as well
if (may_use_stun[1]) {
spawn_subparsers(&sdp_parser->host, sdp_parser->port, &ip->key.addr[0], info.port, parent, now);
}
// If both senders IP were different from advertized ones then start conntracking between these two senders IP as well
if (may_use_stun[0] && may_use_stun[1]) {
spawn_subparsers(&sdp_parser->sender, sdp_parser->port, &ip->key.addr[0], info.port, parent, now);
}
// TODO: terminate this parser. meanwhile, reset its state :
sdp_parser->host_set = false;
sdp_parser->sender_set = false;
}
}
return proto_parse(NULL, &layer, way, NULL, 0, 0, now, okfn);
}
static enum proto_parse_status sdp_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *packet, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct sdp_parser *sdp_parser = DOWNCAST(parser, parser, sdp_parser);
static struct sdper_field const fields[] = {
{ 1, "c", sdp_extract_host },
{ 1, "m", sdp_extract_port },
};
static struct sdper const sdper = {
.nb_fields = NB_ELEMS(fields),
.fields = fields
};
SLOG(LOG_DEBUG, "Starting SDP analysis");
/* Parse */
struct sdp_proto_info info;
sdp_proto_info_ctor(&info, parser, parent, wire_len, 0);
if (0 != sdper_parse(&sdper, &cap_len, packet, cap_len, &info)) return PROTO_PARSE_ERR;
// Start conntracking of RT(C)P streams if we have all required informations
if (
(info.set_values & SDP_PORT_SET) &&
(info.set_values & SDP_HOST_SET)
) {
SLOG(LOG_DEBUG, "SDP@%p, connect info is %s:%"PRIu16, sdp_parser, ip_addr_2_str(&info.host), info.port);
/* FIXME: store both peers of the SDP tunnel and respawn the RT(C)Ps as soon as
* one of the end changes. Problem is: we don't know which peer this is! */
if (! sdp_parser->host_set) {
sdp_parser->host_set = true;
sdp_parser->host = info.host;
sdp_parser->port = info.port;
ASSIGN_INFO_OPT(ip, parent);
if (ip) {
sdp_parser->sender = ip->key.addr[0];
sdp_parser->sender_set = true;
} else {
sdp_parser->sender_set = false;
}
} else if (0 != ip_addr_cmp(&sdp_parser->host, &info.host)) {
/* Start conntracking between the advertized hosts
* Notice that we request RT(C)P on behalf of our parent! */
spawn_rtp_subparsers(&sdp_parser->host, sdp_parser->port, &info.host, info.port, now, parent->parser->proto);
ASSIGN_INFO_OPT(ip, parent);
bool may_use_stun[2] = {
0 != ip_addr_cmp(&sdp_parser->sender, &sdp_parser->host),
ip && 0 != ip_addr_cmp(&ip->key.addr[0], &info.host),
};
// If the sender IP was different from the advertized host, start conntracking on this socket too
if (may_use_stun[0]) {
spawn_rtp_subparsers(&sdp_parser->sender, sdp_parser->port, &info.host, info.port, now, parent->parser->proto);
}
// If _this_ sender IP is different from this advertized host, start conntracking on this socket as well
if (may_use_stun[1]) {
spawn_rtp_subparsers(&sdp_parser->host, sdp_parser->port, &ip->key.addr[0], info.port, now, parent->parser->proto);
}
// If both senders IP were different from advertized ones then start conntracking between these two senders IP as well
if (may_use_stun[0] && may_use_stun[1]) {
spawn_rtp_subparsers(&sdp_parser->sender, sdp_parser->port, &ip->key.addr[0], info.port, now, parent->parser->proto);
}
// TODO: terminate this parser. meanwhile, reset its state :
sdp_parser->host_set = false;
sdp_parser->sender_set = false;
}
}
return proto_parse(NULL, &info.info, way, NULL, 0, 0, now, tot_cap_len, tot_packet);
}
