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@ -80,6 +80,8 @@ struct sdp_media {
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struct sdp_attributes attributes;
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GQueue format_list; /* list of slice-alloc'd str objects */
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enum media_type media_type_id;
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unsigned int legacy_osrtp:1;
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};
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struct attribute_rtcp {
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@ -1536,6 +1538,73 @@ static void __sdp_t38(struct stream_params *sp, struct sdp_media *media) {
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}
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static void sp_free(void *p) {
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struct stream_params *s = p;
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codec_store_cleanup(&s->codecs);
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ice_candidates_free(&s->ice_candidates);
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crypto_params_sdes_queue_clear(&s->sdes_params);
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g_slice_free1(sizeof(*s), s);
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}
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// Check the list for a legacy non-RFC OSRTP offer:
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// Given m= lines must be alternating between one RTP and one SRTP m= line, with matching
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// types between each pair.
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// If found, rewrite the list to pretend that only the SRTP m=line was given, and mark
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// the session media accordingly.
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// TODO: should be handled by monologue_offer_answer, without requiring OSRTP-accept to be
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// set for re-invites. SDP rewriting and skipping media sections should be handled by
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// associating offer/answer media sections directly with each other, instead of requiring
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// the indexing to be in order and instead of requiring all sections between monologue and sdp_media
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// lists to be matching.
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static void legacy_osrtp_accept(struct stream_params *sp, GQueue *streams, GList *prev_media_link,
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struct sdp_ng_flags *flags, unsigned int *num)
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{
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if (!streams->tail)
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return;
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if (!prev_media_link)
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return;
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struct stream_params *last = streams->tail->data;
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if (!flags->osrtp_accept_legacy)
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return;
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// protocols must be known
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if (!sp->protocol)
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return;
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if (!last->protocol)
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return;
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// types must match
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if (sp->type_id != last->type_id)
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return;
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// we must be looking at a SRTP media section
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if (!sp->protocol->rtp)
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return;
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if (!sp->protocol->srtp)
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return;
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// previous one must be a plain RTP section
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if (!last->protocol->rtp)
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return;
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if (last->protocol->srtp)
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return;
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// is this a non-rejected SRTP section?
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if (sp->rtp_endpoint.port) {
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// looks ok. remove the previous one and only retain this one. mark it as such.
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g_queue_pop_tail(streams);
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sp_free(last);
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SP_SET(sp, LEGACY_OSRTP);
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struct sdp_media *prev_media = prev_media_link->data;
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prev_media->legacy_osrtp = 1;
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sp->index--;
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(*num)--;
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}
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}
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/* XXX split this function up */
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int sdp_streams(const GQueue *sessions, GQueue *streams, struct sdp_ng_flags *flags) {
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struct sdp_session *session;
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@ -1543,10 +1612,9 @@ int sdp_streams(const GQueue *sessions, GQueue *streams, struct sdp_ng_flags *fl
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struct stream_params *sp;
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GList *l, *k;
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const char *errstr;
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int num;
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unsigned int num = 0;
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struct sdp_attribute *attr;
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num = 0;
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for (l = sessions->head; l; l = l->next) {
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session = l->data;
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@ -1662,6 +1730,8 @@ int sdp_streams(const GQueue *sessions, GQueue *streams, struct sdp_ng_flags *fl
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sp->protocol = &transport_protocols[sp->protocol->osrtp_proto];
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}
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legacy_osrtp_accept(sp, streams, k->prev, flags, &num);
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// a=mid
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attr = attr_get_by_id(&media->attributes, ATTR_MID);
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if (attr)
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@ -1707,14 +1777,6 @@ error:
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return -1;
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}
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static void sp_free(void *p) {
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struct stream_params *s = p;
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codec_store_cleanup(&s->codecs);
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ice_candidates_free(&s->ice_candidates);
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crypto_params_sdes_queue_clear(&s->sdes_params);
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g_slice_free1(sizeof(*s), s);
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}
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void sdp_streams_free(GQueue *q) {
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g_queue_clear_full(q, sp_free);
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}
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@ -2797,6 +2859,13 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call_monologu
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for (k = session->media_streams.head; k; k = k->next) {
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sdp_media = k->data;
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// skip over received dummy SDP sections
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if (sdp_media->legacy_osrtp) {
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skip_over(chop, &sdp_media->s);
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continue;
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}
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err = "no matching media";
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if (!m)
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goto error;
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@ -2810,6 +2879,22 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call_monologu
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goto error;
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ps = rtp_ps_link->data;
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// generate rejected m= line for accepted legacy OSRTP
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if (MEDIA_ISSET(call_media, LEGACY_OSRTP)
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&& call_media->protocol
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&& call_media->protocol->srtp)
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{
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chopper_append_c(chop, "m=");
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chopper_append_str(chop, &call_media->type);
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const struct transport_protocol *prtp
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= &transport_protocols[call_media->protocol->rtp_proto];
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chopper_append_c(chop, " 0 ");
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chopper_append_c(chop, prtp->name);
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chopper_append_c(chop, " ");
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chopper_append_str(chop, &call_media->format_str);
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chopper_append_c(chop, "\r\n");
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}
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bool is_active = true;
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if (flags->ice_option != ICE_FORCE_RELAY && call_media->type_id != MT_MESSAGE) {
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Richard Fuchs
2 years ago