add VTY commands: mncc internal / external (== -M)

So far the only way to use external MNCC is to pass the -M cmdline arg:

  osmo-msc -M /path/to/socket

However, the osmo-msc.service file for systemd is installed by 'make install',
and hence it is quite impractical to depend on such a config item to be
required in the service file:

- It defies any scheme an operator may have in place to compose the
  osmo-msc.cfg file -- this option doesn't go in the .cfg file but needs
  separate action to add to the installed service file.

- After a make install or package upgrades / re-installations, this option will
  be plain overwritten silently, or lead to the need for resolving file
  conflicts.

The initial spark for this came from configuring the 35c3 GSM from cfg
templates.

Change-Id: I2ec59d5eba407f83295528b51b93678d446b9cee

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libmsc/osmo_msc.c b/src/libmsc/osmo_msc.c
index 52277b75d..37c1d15a4 100644
--- a/src/libmsc/osmo_msc.c
+++ b/src/libmsc/osmo_msc.c
@@ -76,6 +76,13 @@ struct gsm_network *gsm_network_init(void *ctx, mncc_recv_cb_t mncc_recv)
 	return net;
 }
 
+void gsm_network_set_mncc_sock_path(struct gsm_network *net, const char *mncc_sock_path)
+{
+	if (net->mncc_sock_path)
+		talloc_free(net->mncc_sock_path);
+	net->mncc_sock_path = mncc_sock_path ? talloc_strdup(net, mncc_sock_path) : NULL;
+}
+
 /* Receive a SAPI-N-REJECT from BSC */
 void ran_conn_sapi_n_reject(struct ran_conn *conn, int dlci)
 {