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network: use originating RTP packet address for loopback 

When a connection is created in loopback mode all incoming
packets should be reflected back to their origin. If the
user did not supply a destination address with the CRCX
command all incoming packets will be tossed because no
destination address is officially known yet.

If there is no destination address set and the connection
is in loopback mode. Then use the originating address of
the incoming packet as destination address.

Change-Id: I3d1abe56d016e28c97f60635eb574679d36e2c52
This commit is contained in:
Philipp Maier 2017-12-12 16:20:25 +01:00
parent 7bc5552512
commit 5dbfc78aff
1 changed files with 9 additions and 0 deletions
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9
src/libosmo-mgcp/mgcp_network.c
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@ -1077,7 +1077,16 @@ static int rtp_data_net(struct osmo_fd *fd, unsigned int what)
/* Check if the connection is in loopback mode, if yes, just send the
* incoming data back to the origin */
if (conn_src->conn->mode == MGCP_CONN_LOOPBACK) {
/* When we are in loopback mode, we loop back all incoming
* packets back to their origin. We will use the originating
* address data from the UDP packet header to patch the
* outgoing address in connection on the fly */
if (conn_src->end.rtp_port == 0) {
conn_src->end.addr = addr.sin_addr;
conn_src->end.rtp_port = addr.sin_port;
}
return mgcp_send_rtp(proto, &addr, buf,
len, conn_src, conn_src);
}