diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index ec3616a22722d522431c1857aa782035b31b8a34..6795ce2eeea7e16997dc0ef1cb3d9e8c4f7d6ce6 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -7781,6 +7781,63 @@ static int find_sdp(struct sip_request *req)
return FALSE;
}
+enum media_type {
+ SDP_AUDIO,
+ SDP_VIDEO,
+};
+
+static int get_ip_and_port_from_sdp(struct sip_request *req, const enum media_type media, struct sockaddr_in *sin)
+{
+ const char *m;
+ const char *c;
+ int miterator = req->sdp_start;
+ int citerator = req->sdp_start;
+ int x = 0;
+ int numberofports;
+ int len;
+ char host[258] = ""; /*Initialize to empty so we will know if we have any input */
+ struct ast_hostent audiohp;
+ struct hostent *hp;
+
+ c = get_sdp_iterate(&citerator, req, "c");
+ if (sscanf(c, "IN IP4 %256s", host) != 1) {
+ ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
+ /* Continue since there may be a valid host in a c= line specific to the audio stream */
+ }
+ /* We only want the m and c lines for audio */
+ while ((m = get_sdp_iterate(&miterator, req, "m"))) {
+ if ((media == SDP_AUDIO && ((sscanf(m, "audio %d/%d RTP/AVP %n", &x, &numberofports, &len) == 2 && len > 0) ||
+ (sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1 && len > 0))) ||
+ (media == SDP_VIDEO && ((sscanf(m, "video %d/%d RTP/AVP %n", &x, &numberofports, &len) == 2 && len > 0) ||
+ (sscanf(m, "video %d RTP/AVP %n", &x, &len) == 1 && len > 0)))) {
+ /* See if there's a c= line for this media stream.
+ * XXX There is no guarantee that we'll be grabbing the c= line for this
+ * particular media stream here. However, this is the same logic used in process_sdp.
+ */
+ c = get_sdp_iterate(&citerator, req, "c");
+ if (!ast_strlen_zero(c)) {
+ sscanf(c, "IN IP4 %256s", host);
+ }
+ break;
+ }
+ }
+
+ if (ast_strlen_zero(host) || x == 0) {
+ ast_log(LOG_WARNING, "Failed to read an alternate host or port in SDP. Expect %s problems\n", media == SDP_AUDIO ? "audio" : "video");
+ return -1;
+ }
+
+ hp = ast_gethostbyname(host, &audiohp);
+ if (!hp) {
+ ast_log(LOG_WARNING, "Could not look up IP address of alternate hostname. Expect %s problems\n", media == SDP_AUDIO? "audio" : "video");
+ return -1;
+ }
+
+ memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
+ sin->sin_port = htons(x);
+ return 0;
+}
+
/*! \brief Process SIP SDP offer, select formats and activate RTP channels
If offer is rejected, we will not change any properties of the call
Return 0 on success, a negative value on errors.
@@ -19907,6 +19964,21 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
} else {
/* We already have a pending invite. Sorry. You are on hold. */
p->glareinvite = seqno;
+ if (p->rtp && find_sdp(req)) {
+ struct sockaddr_in sin;
+ if (get_ip_and_port_from_sdp(req, SDP_AUDIO, &sin)) {
+ ast_log(LOG_WARNING, "Failed to set an alternate media source on glared reinvite. Audio may not work properly on this call.\n");
+ } else {
+ ast_rtp_instance_set_alt_remote_address(p->rtp, &sin);
+ }
+ if (p->vrtp) {
+ if (get_ip_and_port_from_sdp(req, SDP_VIDEO, &sin)) {
+ ast_log(LOG_WARNING, "Failed to set an alternate media source on glared reinvite. Video may not work properly on this call.\n");
+ } else {
+ ast_rtp_instance_set_alt_remote_address(p->vrtp, &sin);
+ }
+ }
+ }
transmit_response_reliable(p, "491 Request Pending", req);
ast_debug(1, "Got INVITE on call where we already have pending INVITE, deferring that - %s\n", p->callid);
/* Don't destroy dialog here */
diff --git a/include/asterisk/rtp_engine.h b/include/asterisk/rtp_engine.h
index edd7d1c47cfeae7d4a19913a128e5754806fadf1..3fcc129892192e88163ebd8fc2cb72f40f788b75 100644
--- a/include/asterisk/rtp_engine.h
+++ b/include/asterisk/rtp_engine.h
@@ -323,6 +323,8 @@ struct ast_rtp_engine {
void (*packetization_set)(struct ast_rtp_instance *instance, struct ast_codec_pref *pref);
/*! Callback for setting the remote address that RTP is to be sent to */
void (*remote_address_set)(struct ast_rtp_instance *instance, struct sockaddr_in *sin);
+ /*! Callback for setting an alternate remote address */
+ void (*alt_remote_address_set)(struct ast_rtp_instance *instance, struct sockaddr_in *sin);
/*! Callback for changing DTMF mode */
int (*dtmf_mode_set)(struct ast_rtp_instance *instance, enum ast_rtp_dtmf_mode dtmf_mode);
/*! Callback for retrieving statistics */
@@ -638,6 +640,28 @@ struct ast_frame *ast_rtp_instance_read(struct ast_rtp_instance *instance, int r
*/
int ast_rtp_instance_set_remote_address(struct ast_rtp_instance *instance, struct sockaddr_in *address);
+/*!
+ * \brief Set the address of an an alternate RTP address to receive from
+ *
+ * \param instance The RTP instance to change the address on
+ * \param address Address to set it to
+ *
+ * \retval 0 success
+ * \retval -1 failure
+ *
+ * Example usage:
+ *
+ * \code
+ * ast_rtp_instance_set_alt_remote_address(instance, &sin);
+ * \endcode
+ *
+ * This changes the alternate remote address that RTP will be sent to on instance to the address given in the sin
+ * structure.
+ *
+ * \since 1.6.3
+ */
+int ast_rtp_instance_set_alt_remote_address(struct ast_rtp_instance *instance, struct sockaddr_in *address);
+
/*!
* \brief Set the address that we are expecting to receive RTP on
*
diff --git a/main/rtp_engine.c b/main/rtp_engine.c
index 85ee9b69fa50bf8add628f2dcbe46f70941345a4..cb4caafdd106a5d59f9f45d7dfc1bc369e7e4e2c 100644
--- a/main/rtp_engine.c
+++ b/main/rtp_engine.c
@@ -50,6 +50,8 @@ struct ast_rtp_instance {
struct sockaddr_in local_address;
/*! Address that we are sending RTP to */
struct sockaddr_in remote_address;
+ /*! Alternate address that we are receiving RTP from */
+ struct sockaddr_in alt_remote_address;
/*! Instance that we are bridged to if doing remote or local bridging */
struct ast_rtp_instance *bridged;
/*! Payload and packetization information */
@@ -373,6 +375,20 @@ int ast_rtp_instance_set_remote_address(struct ast_rtp_instance *instance, struc
return 0;
}
+int ast_rtp_instance_set_alt_remote_address(struct ast_rtp_instance *instance, struct sockaddr_in *address)
+{
+ instance->alt_remote_address.sin_addr = address->sin_addr;
+ instance->alt_remote_address.sin_port = address->sin_port;
+
+ /* oink */
+
+ if (instance->engine->alt_remote_address_set) {
+ instance->engine->alt_remote_address_set(instance, &instance->alt_remote_address);
+ }
+
+ return 0;
+}
+
int ast_rtp_instance_get_local_address(struct ast_rtp_instance *instance, struct sockaddr_in *address)
{
if ((address->sin_family != AF_INET) ||
diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index ed01a834f75386f31fc71451c14017e8b1899ea0..43f8ae7d0edd64bad6bfc86ceee91cf9f073f53b 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -166,6 +166,7 @@ struct ast_rtp {
enum strict_rtp_state strict_rtp_state; /*!< Current state that strict RTP protection is in */
struct sockaddr_in strict_rtp_address; /*!< Remote address information for strict RTP purposes */
+ struct sockaddr_in alt_rtp_address; /*!<Alternate remote address information */
struct rtp_red *red;
};
@@ -257,6 +258,7 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
static void ast_rtp_prop_set(struct ast_rtp_instance *instance, enum ast_rtp_property property, int value);
static int ast_rtp_fd(struct ast_rtp_instance *instance, int rtcp);
static void ast_rtp_remote_address_set(struct ast_rtp_instance *instance, struct sockaddr_in *sin);
+static void ast_rtp_alt_remote_address_set(struct ast_rtp_instance *instance, struct sockaddr_in *sin);
static int rtp_red_init(struct ast_rtp_instance *instance, int buffer_time, int *payloads, int generations);
static int rtp_red_buffer(struct ast_rtp_instance *instance, struct ast_frame *frame);
static int ast_rtp_local_bridge(struct ast_rtp_instance *instance0, struct ast_rtp_instance *instance1);
@@ -278,6 +280,7 @@ static struct ast_rtp_engine asterisk_rtp_engine = {
.prop_set = ast_rtp_prop_set,
.fd = ast_rtp_fd,
.remote_address_set = ast_rtp_remote_address_set,
+ .alt_remote_address_set = ast_rtp_alt_remote_address_set,
.red_init = rtp_red_init,
.red_buffer = rtp_red_buffer,
.local_bridge = ast_rtp_local_bridge,
@@ -1878,8 +1881,14 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
rtp->strict_rtp_state = STRICT_RTP_CLOSED;
} else if (rtp->strict_rtp_state == STRICT_RTP_CLOSED) {
if ((rtp->strict_rtp_address.sin_addr.s_addr != sin.sin_addr.s_addr) || (rtp->strict_rtp_address.sin_port != sin.sin_port)) {
- ast_debug(1, "Received RTP packet from %s:%d, dropping due to strict RTP protection. Expected it to be from %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), ast_inet_ntoa(rtp->strict_rtp_address.sin_addr), ntohs(rtp->strict_rtp_address.sin_port));
- return &ast_null_frame;
+ /* Hmm, not the strict addres. Perhaps we're getting audio from the alternate? */
+ if ((rtp->alt_rtp_address.sin_addr.s_addr == sin.sin_addr.s_addr) && (rtp->alt_rtp_address.sin_port == sin.sin_port)) {
+ /* ooh, we did! You're now the new expected address, son! */
+ rtp->strict_rtp_address = sin;
+ } else {
+ ast_debug(1, "Received RTP packet from %s:%d, dropping due to strict RTP protection. Expected it to be from %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), ast_inet_ntoa(rtp->strict_rtp_address.sin_addr), ntohs(rtp->strict_rtp_address.sin_port));
+ return &ast_null_frame;
+ }
}
}
@@ -2200,6 +2209,18 @@ static void ast_rtp_remote_address_set(struct ast_rtp_instance *instance, struct
return;
}
+static void ast_rtp_alt_remote_address_set(struct ast_rtp_instance *instance, struct sockaddr_in *sin)
+{
+ struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
+
+ /* No need to futz with rtp->rtcp here because ast_rtcp_read is already able to adjust if receiving
+ * RTCP from an "unexpected" source
+ */
+ rtp->alt_rtp_address = *sin;
+
+ return;
+}
+
/*! \brief Write t140 redundacy frame
* \param data primary data to be buffered
*/