summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorHolger Hans Peter Freyther <holger@moiji-mobile.com>2016-03-26 06:17:29 +0100
committerHolger Hans Peter Freyther <holger@moiji-mobile.com>2016-03-26 06:22:06 +0100
commit2211c3ba567472786274fe00599211cfcfdbdcca (patch)
treea6684c521527ad3972350f1453b81228acb8e481
parent2e36090feadb524430eee70cf0b0e16f1c10f839 (diff)
sip: Implement MT call out to SIP
* Create a new handle * Send the invite * Have some state transitions * Allow to release a call in initial unconfirmed state, confirmed one with cancel and connected with bye * Add simple SDP parsing to find the rtpmap/codec that is used by gsm
-rw-r--r--src/call.h16
-rw-r--r--src/sip.c268
-rw-r--r--src/sip.h3
3 files changed, 287 insertions, 0 deletions
diff --git a/src/call.h b/src/call.h
index a7f03ee..d91f101 100644
--- a/src/call.h
+++ b/src/call.h
@@ -10,6 +10,9 @@
struct sip_agent;
struct mncc_connection;
+
+struct nua_handle_s;
+
struct call_leg;
/**
@@ -62,10 +65,23 @@ struct call_leg {
void (*release_call)(struct call_leg *);
};
+enum sip_cc_state {
+ SIP_CC_INITIAL,
+ SIP_CC_DLG_CNFD,
+ SIP_CC_CONNECTED,
+};
+
struct sip_call_leg {
+ /* base class */
struct call_leg base;
+ /* back pointer */
struct sip_agent *agent;
+
+ /* per instance members */
+ struct nua_handle_s *nua_handle;
+ enum sip_cc_state state;
+ const char *wanted_codec;
};
enum mncc_cc_state {
diff --git a/src/sip.c b/src/sip.c
index 8b02b00..0a53e28 100644
--- a/src/sip.c
+++ b/src/sip.c
@@ -20,6 +20,12 @@
#include "sip.h"
#include "app.h"
+#include "call.h"
+#include "logging.h"
+
+#include <osmocom/core/utils.h>
+
+#include <sofia-sip/sdp.h>
#include <talloc.h>
@@ -27,8 +33,270 @@
extern void *tall_mncc_ctx;
+static bool extract_sdp(struct sip_call_leg *leg, const sip_t *sip)
+{
+ sdp_connection_t *conn;
+ sdp_session_t *sdp;
+ sdp_parser_t *parser;
+ sdp_media_t *media;
+ const char *sdp_data;
+ bool found_conn = false, found_map = false;
+
+ if (!sip->sip_payload || !sip->sip_payload->pl_data) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) but no SDP file\n", leg);
+ return false;
+ }
+
+ sdp_data = sip->sip_payload->pl_data;
+ parser = sdp_parse(NULL, sdp_data, strlen(sdp_data), 0);
+ if (!parser) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) failed to parse SDP\n",
+ leg);
+ return false;
+ }
+
+ sdp = sdp_session(parser);
+ if (!sdp) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) no sdp session\n", leg);
+ sdp_parser_free(parser);
+ return false;
+ }
+
+ for (conn = sdp->sdp_connection; conn; conn = conn->c_next) {
+ struct in_addr addr;
+
+ if (conn->c_addrtype != sdp_addr_ip4)
+ continue;
+ inet_aton(conn->c_address, &addr);
+ leg->base.ip = addr.s_addr;
+ found_conn = true;
+ break;
+ }
+
+ for (media = sdp->sdp_media; media; media = media->m_next) {
+ sdp_rtpmap_t *map;
+
+ if (media->m_proto != sdp_proto_rtp)
+ continue;
+ if (media->m_type != sdp_media_audio)
+ continue;
+
+ for (map = media->m_rtpmaps; map; map = map->rm_next) {
+ if (strcasecmp(map->rm_encoding, leg->wanted_codec) != 0)
+ continue;
+
+ leg->base.port = media->m_port;
+ leg->base.payload_type = map->rm_pt;
+ found_map = true;
+ break;
+ }
+
+ if (found_map)
+ break;
+ }
+
+ if (!found_conn || !found_map) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) did not find %d/%d\n",
+ leg, found_conn, found_map);
+ sdp_parser_free(parser);
+ return false;
+ }
+
+ sdp_parser_free(parser);
+ return true;
+}
+
+static void call_progress(struct sip_call_leg *leg, const sip_t *sip)
+{
+ struct call_leg *other = call_leg_other(&leg->base);
+
+ if (!other)
+ return;
+
+ LOGP(DSIP, LOGL_NOTICE, "leg(%p) is now rining.\n", leg);
+ other->ring_call(other);
+}
+
+static void call_connect(struct sip_call_leg *leg, const sip_t *sip)
+{
+ /* extract SDP file and if compatible continue */
+ struct call_leg *other = call_leg_other(&leg->base);
+
+ if (!other) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) connected but leg gone\n", leg);
+ nua_cancel(leg->nua_handle, TAG_END());
+ return;
+ }
+
+ if (!extract_sdp(leg, sip)) {
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) incompatible audio, releasing\n", leg);
+ nua_cancel(leg->nua_handle, TAG_END());
+ other->release_call(other);
+ return;
+ }
+
+ LOGP(DSIP, LOGL_NOTICE, "leg(%p) is now connected.\n", leg);
+ leg->state = SIP_CC_CONNECTED;
+ other->connect_call(other);
+ nua_ack(leg->nua_handle, TAG_END());
+}
+
void nua_callback(nua_event_t event, int status, char const *phrase, nua_t *nua, nua_magic_t *magic, nua_handle_t *nh, nua_hmagic_t *hmagic, sip_t const *sip, tagi_t tags[])
{
+ LOGP(DSIP, LOGL_DEBUG, "SIP event(%u) status(%d) phrase(%s) %p\n",
+ event, status, phrase, hmagic);
+
+ if (event == nua_r_invite) {
+ struct sip_call_leg *leg;
+ leg = (struct sip_call_leg *) hmagic;
+
+ /* MT call is moving forward */
+
+ /* The dialogue is now confirmed */
+ if (leg->state == SIP_CC_INITIAL)
+ leg->state = SIP_CC_DLG_CNFD;
+
+ if (status == 180)
+ call_progress(leg, sip);
+ else if (status == 200)
+ call_connect(leg, sip);
+ else if (status >= 300) {
+ struct call_leg *other = call_leg_other(&leg->base);
+
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) unknown err, releasing.\n", leg);
+ nua_cancel(leg->nua_handle, TAG_END());
+ nua_handle_destroy(leg->nua_handle);
+ call_leg_release(&leg->base);
+
+ if (other)
+ other->release_call(other);
+ }
+ } else if (event == nua_r_bye || event == nua_r_cancel) {
+ /* our bye or hang up is answered */
+ struct sip_call_leg *leg = (struct sip_call_leg *) hmagic;
+ LOGP(DSIP, LOGL_NOTICE, "leg(%p) got resp to %s\n",
+ leg, event == nua_r_bye ? "bye" : "cancel");
+ nua_handle_destroy(leg->nua_handle);
+ call_leg_release(&leg->base);
+ } else if (event == nua_i_bye) {
+ /* our remote has hung up */
+ struct sip_call_leg *leg = (struct sip_call_leg *) hmagic;
+ struct call_leg *other = call_leg_other(&leg->base);
+
+ LOGP(DSIP, LOGL_ERROR, "leg(%p) got bye, releasing.\n", leg);
+ nua_handle_destroy(leg->nua_handle);
+ call_leg_release(&leg->base);
+
+ if (other)
+ other->release_call(other);
+ }
+}
+
+
+static void sip_release_call(struct call_leg *_leg)
+{
+ struct sip_call_leg *leg;
+
+ OSMO_ASSERT(_leg->type == CALL_TYPE_SIP);
+ leg = (struct sip_call_leg *) _leg;
+
+ /*
+ * If a dialogue is not confirmed yet, we can probably not do much
+ * but wait for the timeout. For a confirmed one we can send cancel
+ * and for a connected one bye. I don't see how sofia-sip is going
+ * to help us here.
+ */
+ switch (leg->state) {
+ case SIP_CC_INITIAL:
+ LOGP(DSIP, LOGL_NOTICE, "Canceling leg(%p) in int state\n", leg);
+ nua_handle_destroy(leg->nua_handle);
+ call_leg_release(&leg->base);
+ break;
+ case SIP_CC_DLG_CNFD:
+ LOGP(DSIP, LOGL_NOTICE, "Canceling leg(%p) in cnfd state\n", leg);
+ nua_cancel(leg->nua_handle, TAG_END());
+ break;
+ case SIP_CC_CONNECTED:
+ LOGP(DSIP, LOGL_NOTICE, "Ending leg(%p) in con\n", leg);
+ nua_bye(leg->nua_handle, TAG_END());
+ break;
+ }
+}
+
+static const char *media_name(int ptmsg)
+{
+ return "GSM";
+}
+
+static int send_invite(struct sip_agent *agent, struct sip_call_leg *leg,
+ const char *calling_num, const char *called_num)
+{
+ struct call_leg *other = leg->base.call->initial;
+ struct in_addr net = { .s_addr = ntohl(other->ip) };
+
+ leg->wanted_codec = media_name(other->payload_msg_type);
+
+ char *from = talloc_asprintf(leg, "sip:%s@%s",
+ calling_num,
+ agent->app->sip.local_addr);
+ char *to = talloc_asprintf(leg, "sip:%s@%s",
+ called_num,
+ agent->app->sip.remote_addr);
+ char *sdp = talloc_asprintf(leg,
+ "v=0\r\n"
+ "o=Osmocom 0 0 IN IP4 %s\r\n"
+ "s=GSM Call\r\n"
+ "c=IN IP4 %s\r\n"
+ "t=0 0\r\n"
+ "m=audio %d RTP/AVP %d\r\n"
+ "a=rtpmap:%d %s/8000\r\n",
+ inet_ntoa(net), inet_ntoa(net), /* never use diff. addr! */
+ other->port, other->payload_type,
+ other->payload_type,
+ leg->wanted_codec);
+
+ leg->state = SIP_CC_INITIAL;
+ nua_invite(leg->nua_handle,
+ SIPTAG_FROM_STR(from),
+ SIPTAG_TO_STR(to),
+ NUTAG_MEDIA_ENABLE(0),
+ SIPTAG_CONTENT_TYPE_STR("application/sdp"),
+ SIPTAG_PAYLOAD_STR(sdp),
+ TAG_END());
+
+ leg->base.call->remote = &leg->base;
+ talloc_free(from);
+ talloc_free(to);
+ talloc_free(sdp);
+ return 0;
+}
+
+int sip_create_remote_leg(struct sip_agent *agent, struct call *call,
+ const char *source, const char *dest)
+{
+ struct sip_call_leg *leg;
+
+ leg = talloc_zero(call, struct sip_call_leg);
+ if (!leg) {
+ LOGP(DSIP, LOGL_ERROR, "Failed to allocate leg for call(%u)\n",
+ call->id);
+ return -1;
+ }
+
+ leg->base.type = CALL_TYPE_SIP;
+ leg->base.call = call;
+ leg->base.release_call = sip_release_call;
+ leg->agent = agent;
+
+ leg->nua_handle = nua_handle(agent->nua, leg, TAG_END());
+ if (!leg->nua_handle) {
+ LOGP(DSIP, LOGL_ERROR, "Failed to allocate nua for call(%u)\n",
+ call->id);
+ talloc_free(leg);
+ return -2;
+ }
+
+ return send_invite(agent, leg, source, dest);
}
char *make_sip_uri(struct sip_agent *agent)
diff --git a/src/sip.h b/src/sip.h
index 14ec8dc..4ba0a0e 100644
--- a/src/sip.h
+++ b/src/sip.h
@@ -8,6 +8,7 @@
#include <sofia-sip/nua.h>
struct app_config;
+struct call;
struct sip_agent {
struct app_config *app;
@@ -19,3 +20,5 @@ struct sip_agent {
void sip_agent_init(struct sip_agent *agent, struct app_config *app);
int sip_agent_start(struct sip_agent *agent);
+
+int sip_create_remote_leg(struct sip_agent *agent, struct call *call, const char *local, const char *remote);