[PATCH] osmo-mgw[master]: protocol: check requested connection mode

[dexter]

Review at  https://gerrit.osmocom.org/6258

protocol: check requested connection mode

The connection mode setting (e.g. recvonly) is not checked on CRCX
and MDCX. This allows requests that set the connection mode to
sendrecv or sendonly without ever configuring the remote end of
the connection (half-open connection).

- reject sendrecv or sendonly on half open connections

See also TTCN3 Test:
MGCP_Test.TC_crcx_early_bidir_mode

Change-Id: I6ab01855d3b1faa36aebac357e7b97c563990678
Related: OS#2652
---
M src/libosmo-mgcp/mgcp_protocol.c
1 file changed, 22 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-mgw refs/changes/58/6258/1

diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index 2977fdf..05aefc1 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -654,6 +654,17 @@
 
        mgcp_rtp_end_config(endp, 0, &conn->end);
 
+       /* check connection mode setting */
+       if (conn->conn->mode != MGCP_CONN_LOOPBACK
+           && conn->conn->mode != MGCP_CONN_RECV_ONLY
+           && conn->end.rtp_port == 0) {
+               LOGP(DLMGCP, LOGL_ERROR,
+                    "CRCX: endpoint:%x selected connection mode type requires 
an opposite end!\n",
+                    ENDPOINT_NUMBER(endp));
+               error_code = 527;
+               goto error2;
+       }
+
        if (allocate_port(endp, conn) != 0) {
                goto error2;
        }
@@ -812,6 +823,17 @@
                mgcp_set_audio_info(p->cfg, &conn->end.codec,
                                    PTYPE_UNDEFINED, endp->local_options.codec);
 
+       /* check connection mode setting */
+       if (conn->conn->mode != MGCP_CONN_LOOPBACK
+           && conn->conn->mode != MGCP_CONN_RECV_ONLY
+           && conn->end.rtp_port == 0) {
+               LOGP(DLMGCP, LOGL_ERROR,
+                    "MDCX: endpoint:%x selected connection mode type requires 
an opposite end!\n",
+                    ENDPOINT_NUMBER(endp));
+               error_code = 527;
+               goto error3;
+       }
+
        if (setup_rtp_processing(endp, conn) != 0)
                goto error3;
 

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I6ab01855d3b1faa36aebac357e7b97c563990678
Gerrit-PatchSet: 1
Gerrit-Project: osmo-mgw
Gerrit-Branch: master
Gerrit-Owner: dexter <pma...@sysmocom.de>