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client: add missing mandatory SDP fields

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The mcgp message generator function mgcp_msg_gen() lacks support
for the mandatory SDP fields (v)ersion, (o)rigin, (s)ession and
(t)ime.

- Automatically generate the missing fields when SDP is
  generated.

Change-Id: I5fbc31a17e8ac10c7cc5dbc31357b61e8920aaa5
Related: OS#2837
This commit is contained in:
Philipp Maier
2018-01-22 17:31:10 +01:00
committed by Harald Welte
parent 490cbaa89e
commit 9d25d7a2e6
2 changed files with 32 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
src/libosmo-mgcp-client/mgcp_client.c
View File

@@ -740,6 +740,7 @@ struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg)
uint32_t mandatory_mask;
struct msgb *msg = msgb_alloc_headroom(4096, 128, "MGCP tx");
int rc = 0;
char local_ip[INET_ADDRSTRLEN];
msg->l2h = msg->data;
msg->cb[MSGB_CB_MGCP_TRANS_ID] = trans_id;
@@ -820,9 +821,32 @@ struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg)
msgb_printf(msg, "M: %s\r\n",
mgcp_client_cmode_name(mgcp_msg->conn_mode));
/* Add RTP address and port (SDP) */
/* Add SDP body */
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_AUDIO_IP
&& mgcp_msg->presence & MGCP_MSG_PRESENCE_AUDIO_PORT) {
/* Add separator to mark the beginning of the SDP block */
rc += msgb_printf(msg, "\r\n");
/* Add SDP protocol version */
rc += msgb_printf(msg, "v=0\r\n");
/* Add session name (none) */
rc += msgb_printf(msg, "s=-\r\n");
/* Determine local IP-Address */
if (osmo_sock_local_ip(local_ip, mgcp->actual.remote_addr) < 0) {
LOGP(DLMGCP, LOGL_ERROR,
"Could not determine local IP-Address!\n");
msgb_free(msg);
return NULL;
}
/* Add owner/creator (SDP) */
rc += msgb_printf(msg, "o=- %x 23 IN IP4 %s\r\n",
mgcp_msg->call_id, local_ip);
/* Add RTP address and port */
if (mgcp_msg->audio_port == 0) {
LOGP(DLMGCP, LOGL_ERROR,
"Invalid port number, can not generate MGCP message\n");
@@ -835,11 +859,13 @@ struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg)
msgb_free(msg);
return NULL;
}
rc += msgb_printf(msg, "\r\n");
rc += msgb_printf(msg, "c=IN IP4 %s\r\n", mgcp_msg->audio_ip);
rc +=
msgb_printf(msg, "m=audio %u RTP/AVP 255\r\n",
mgcp_msg->audio_port);
/* Add time description, active time (SDP) */
rc += msgb_printf(msg, "t=0 0\r\n");
}
if (rc != 0) {

4
tests/mgcp_client/mgcp_client_test.ok
View File

@@ -43,8 +43,12 @@ C: 2f
I: 11
M: sendrecv
v=0
s=-
o=- 2f 23 IN IP4 127.0.0.1
c=IN IP4 192.168.100.23
m=audio 1234 RTP/AVP 255
t=0 0
Generated DLCX message:
DLCX 3 23@mgw MGCP 1.0