2016-03-26 19:02:06 +00:00
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/*
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* (C) 2016 by Holger Hans Peter Freyther
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "sdp.h"
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#include "call.h"
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#include "logging.h"
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2016-03-26 21:11:06 +00:00
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#include "app.h"
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#include <talloc.h>
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2016-03-26 19:02:06 +00:00
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#include <sofia-sip/sdp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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2020-09-09 15:39:09 +00:00
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#include <osmocom/core/socket.h>
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2019-07-30 13:58:55 +00:00
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/*
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* Check if the media mode attribute exists in SDP, in this
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* case update the passed pointer with the media mode
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*/
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bool sdp_get_sdp_mode(const sip_t *sip, sdp_mode_t *mode) {
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const char *sdp_data;
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sdp_parser_t *parser;
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sdp_session_t *sdp;
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if (!sip->sip_payload || !sip->sip_payload->pl_data) {
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LOGP(DSIP, LOGL_ERROR, "No SDP file\n");
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return false;
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}
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sdp_data = sip->sip_payload->pl_data;
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parser = sdp_parse(NULL, sdp_data, strlen(sdp_data), sdp_f_mode_0000);
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if (!parser) {
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LOGP(DSIP, LOGL_ERROR, "Failed to parse SDP\n");
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return false;
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}
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sdp = sdp_session(parser);
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if (!sdp) {
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LOGP(DSIP, LOGL_ERROR, "No sdp session\n");
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sdp_parser_free(parser);
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return false;
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}
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if (!sdp->sdp_media || !sdp->sdp_media->m_mode) {
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sdp_parser_free(parser);
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return sdp_sendrecv;
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}
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*mode = sdp->sdp_media->m_mode;
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2021-06-01 01:33:59 +00:00
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sdp_parser_free(parser);
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2019-07-30 13:58:55 +00:00
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return true;
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}
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2016-03-26 19:02:06 +00:00
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/*
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* We want to decide on the audio codec later but we need to see
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* if it is even including some of the supported ones.
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*/
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bool sdp_screen_sdp(const sip_t *sip)
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{
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const char *sdp_data;
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sdp_parser_t *parser;
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sdp_session_t *sdp;
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sdp_media_t *media;
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if (!sip->sip_payload || !sip->sip_payload->pl_data) {
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LOGP(DSIP, LOGL_ERROR, "No SDP file\n");
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return false;
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}
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sdp_data = sip->sip_payload->pl_data;
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parser = sdp_parse(NULL, sdp_data, strlen(sdp_data), 0);
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if (!parser) {
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LOGP(DSIP, LOGL_ERROR, "Failed to parse SDP\n");
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return false;
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}
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sdp = sdp_session(parser);
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if (!sdp) {
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LOGP(DSIP, LOGL_ERROR, "No sdp session\n");
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sdp_parser_free(parser);
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return false;
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}
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for (media = sdp->sdp_media; media; media = media->m_next) {
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sdp_rtpmap_t *map;
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if (media->m_proto != sdp_proto_rtp)
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continue;
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if (media->m_type != sdp_media_audio)
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continue;
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for (map = media->m_rtpmaps; map; map = map->rm_next) {
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if (strcasecmp(map->rm_encoding, "GSM") == 0)
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goto success;
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if (strcasecmp(map->rm_encoding, "GSM-EFR") == 0)
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goto success;
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if (strcasecmp(map->rm_encoding, "GSM-HR-08") == 0)
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goto success;
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if (strcasecmp(map->rm_encoding, "AMR") == 0)
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goto success;
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}
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}
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sdp_parser_free(parser);
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return false;
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success:
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sdp_parser_free(parser);
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return true;
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}
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2016-03-31 14:28:21 +00:00
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bool sdp_extract_sdp(struct sip_call_leg *leg, const sip_t *sip, bool any_codec)
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2016-03-26 19:02:06 +00:00
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{
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sdp_connection_t *conn;
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sdp_session_t *sdp;
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sdp_parser_t *parser;
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sdp_media_t *media;
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const char *sdp_data;
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2020-09-09 15:39:09 +00:00
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uint16_t port;
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2016-03-26 19:02:06 +00:00
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bool found_conn = false, found_map = false;
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if (!sip->sip_payload || !sip->sip_payload->pl_data) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) but no SDP file\n", leg);
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return false;
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}
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sdp_data = sip->sip_payload->pl_data;
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parser = sdp_parse(NULL, sdp_data, strlen(sdp_data), 0);
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if (!parser) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) failed to parse SDP\n",
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leg);
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return false;
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}
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sdp = sdp_session(parser);
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if (!sdp) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) no sdp session\n", leg);
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sdp_parser_free(parser);
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return false;
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}
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for (conn = sdp->sdp_connection; conn; conn = conn->c_next) {
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2020-09-09 15:39:09 +00:00
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switch (conn->c_addrtype) {
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case sdp_addr_ip4:
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2020-09-17 22:32:01 +00:00
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if (inet_pton(AF_INET, conn->c_address,
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&((struct sockaddr_in*)&leg->base.addr)->sin_addr) != 1)
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continue;
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2020-09-09 15:39:09 +00:00
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leg->base.addr.ss_family = AF_INET;
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break;
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case sdp_addr_ip6:
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2020-09-17 22:32:01 +00:00
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if (inet_pton(AF_INET6, conn->c_address,
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&((struct sockaddr_in6*)&leg->base.addr)->sin6_addr) != 1)
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continue;
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2020-09-09 15:39:09 +00:00
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leg->base.addr.ss_family = AF_INET6;
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break;
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default:
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2016-03-26 19:02:06 +00:00
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continue;
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2020-09-09 15:39:09 +00:00
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}
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2020-09-17 22:32:01 +00:00
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found_conn = true;
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2016-03-26 19:02:06 +00:00
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break;
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}
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for (media = sdp->sdp_media; media; media = media->m_next) {
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sdp_rtpmap_t *map;
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if (media->m_proto != sdp_proto_rtp)
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continue;
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if (media->m_type != sdp_media_audio)
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continue;
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for (map = media->m_rtpmaps; map; map = map->rm_next) {
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forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
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if (!any_codec
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&& leg->wanted_codec
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&& strcasecmp(map->rm_encoding, leg->wanted_codec) != 0)
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2016-03-26 19:02:06 +00:00
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continue;
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2020-09-09 15:39:09 +00:00
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port = media->m_port;
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2016-03-26 19:02:06 +00:00
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leg->base.payload_type = map->rm_pt;
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found_map = true;
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break;
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}
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if (found_map)
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break;
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}
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if (!found_conn || !found_map) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) did not find %d/%d\n",
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leg, found_conn, found_map);
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sdp_parser_free(parser);
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return false;
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}
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2020-09-09 15:39:09 +00:00
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switch (leg->base.addr.ss_family) {
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case AF_INET:
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((struct sockaddr_in*)&leg->base.addr)->sin_port = htons(port);
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break;
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case AF_INET6:
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((struct sockaddr_in6*)&leg->base.addr)->sin6_port = htons(port);
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break;
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default:
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OSMO_ASSERT(0);
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}
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2016-03-26 19:02:06 +00:00
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sdp_parser_free(parser);
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return true;
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}
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2016-03-26 21:11:06 +00:00
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forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
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/* One leg has sent a SIP or MNCC message, which is now translated/forwarded to the counterpart MNCC or SIP.
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* Take as much from the source's SDP as possible, but make sure the connection mode reflects the 'mode' arg (sendrecv,
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* recvonly, sendonly, inactive).
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* For example, if the MSC sent an MNCC_SETUP_IND, the SDP from the MNCC is found in 'other', while 'leg' reflects the
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* SIP side that should receive this SDP in the SIP Invite that is being composed by the caller of this function.
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* \param leg The target for which the returned SDP is intended.
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* \param other The source of which we are to reflect the SDP.
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* \return SDP string, using 'leg' as talloc ctx.
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*/
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2019-07-30 13:04:21 +00:00
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char *sdp_create_file(struct sip_call_leg *leg, struct call_leg *other, sdp_mode_t mode)
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2016-03-26 21:11:06 +00:00
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{
|
forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
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sdp_parser_t *parser;
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sdp_session_t *sdp;
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sdp_media_t *media;
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const char *sdp_data;
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sdp_printer_t *printer;
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char buf[1024];
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const char *sdp_str;
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char *ret;
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sdp_data = other->sdp;
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parser = sdp_parse(NULL, sdp_data, strlen(sdp_data), 0);
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if (!parser) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) failed to parse SDP\n", other);
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return talloc_strdup(leg, sdp_data);
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}
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sdp = sdp_session(parser);
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if (!sdp) {
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LOGP(DSIP, LOGL_ERROR, "leg(%p) no sdp session\n", other);
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sdp_parser_free(parser);
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return talloc_strdup(leg, sdp_data);
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|
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}
|
2016-03-26 21:11:06 +00:00
|
|
|
|
forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
|
|
|
for (media = sdp->sdp_media; media; media = media->m_next)
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|
|
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media->m_mode = mode;
|
2017-08-29 14:56:11 +00:00
|
|
|
|
forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
|
|
|
printer = sdp_print(NULL, sdp, buf, sizeof(buf), sdp_f_mode_always);
|
|
|
|
if (!printer) {
|
|
|
|
LOGP(DSIP, LOGL_ERROR, "leg(%p) failed to print SDP\n", other);
|
|
|
|
sdp_parser_free(parser);
|
|
|
|
return talloc_strdup(leg, sdp_data);
|
|
|
|
}
|
2017-08-29 14:56:11 +00:00
|
|
|
|
forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
|
|
|
sdp_str = sdp_message(printer);
|
|
|
|
if (!sdp_str) {
|
|
|
|
LOGP(DSIP, LOGL_ERROR, "leg(%p) failed to print SDP: %s\n", other, sdp_printing_error(printer));
|
|
|
|
sdp_str = sdp_data;
|
2019-07-30 13:04:21 +00:00
|
|
|
}
|
|
|
|
|
forward SDP between SIP and MNCC
We have added support for sending SDP via MNCC a long time ago, but so
far the SDP section remained empty. Now, implement actually forwarding
SDP codec information between SIP and MNCC.
The aim is to let the MSC know about all codec choices the remote SIP
call leg has to offer, so that finding a codec match between local and
remote call leg becomes possible.
Store any SDP info contained in incoming SIP and MNCC messages, and send
the stored SDP to the other call leg in all outgoing SIP and MNCC
messages.
In sdp_create_file(), we used to compose fixed SDP -- instead, take the
other call leg's SDP as-is, only make sure to modify the mode (e.g.
"a=sendrecv") to reflect the current call hold state.
The RTP address and codec info in the MNCC structures is now essentially
a redundant / possibly less accurate copy of the SDP info, but leave all
of that as-is, for backwards compat.
There is codec checking that may reject unexpected codecs. The
overall/future aim is to leave all codec checking up to the MSC, but so
far just leave current behaviour unchanged, until we notice problems.
Related: SYS#5066
Change-Id: I3df5d06f38ee2d122706a9ebffde7db4f2bd6bae
2019-08-15 04:12:54 +00:00
|
|
|
ret = talloc_strdup(leg, sdp_str);
|
|
|
|
|
|
|
|
sdp_parser_free(parser);
|
|
|
|
sdp_printer_free(printer);
|
|
|
|
return ret;
|
2016-03-26 21:11:06 +00:00
|
|
|
}
|