mncc: Introduce a hello packet that is sent to the client.
Send a hello packet down to the client with the version number
of the MNCC interface. The hello structure might be extended to
include the endianes, size of each structure, etc.
diff --git a/openbsc/src/libmsc/mncc_sock.c b/openbsc/src/libmsc/mncc_sock.c
index 7063f20..697f956 100644
--- a/openbsc/src/libmsc/mncc_sock.c
+++ b/openbsc/src/libmsc/mncc_sock.c
@@ -203,6 +203,29 @@
return rc;
}
+/**
+ * Send a version indication to the remote.
+ */
+static void queue_hello(struct mncc_sock_state *mncc)
+{
+ struct gsm_mncc_hello *hello;
+ struct msgb *msg;
+
+ msg = msgb_alloc(512, "mncc hello");
+ if (!msg) {
+ LOGP(DMNCC, LOGL_ERROR, "Failed to allocate hello.\n");
+ mncc_sock_close(mncc);
+ return;
+ }
+
+ hello = (struct gsm_mncc_hello *) msgb_put(msg, sizeof(*hello));
+ hello->msg_type = MNCC_SOCKET_HELLO;
+ hello->version = MNCC_SOCK_VERSION;
+
+ msgb_enqueue(&mncc->net->upqueue, msg);
+ mncc->conn_bfd.when |= BSC_FD_WRITE;
+}
+
/* accept a new connection */
static int mncc_sock_accept(struct osmo_fd *bfd, unsigned int flags)
{
@@ -243,6 +266,7 @@
LOGP(DMNCC, LOGL_NOTICE, "MNCC Socket has connection with external "
"call control application\n");
+ queue_hello(state);
return 0;
}