mgcp-cli: Parse X-Osmux on CRCX response
Change-Id: I6174d092b7425b8d3d6d02a55bf294be3e710e6a
diff --git a/src/libosmo-mgcp-client/mgcp_client.c b/src/libosmo-mgcp-client/mgcp_client.c
index bbef9ef..d65a799 100644
--- a/src/libosmo-mgcp-client/mgcp_client.c
+++ b/src/libosmo-mgcp-client/mgcp_client.c
@@ -393,6 +393,40 @@
return -EINVAL;
}
+/*! Extract OSMUX CID from an MGCP parameter line (string).
+ * \param[in] line single parameter line from the MGCP message
+ * \returns OSMUX CID, -1 wildcard, -2 on error
+ * FIXME: This is a copy of function in mgcp_msg.c. Have some common.c file between both libs?
+ */
+static int mgcp_parse_osmux_cid(const char *line)
+{
+ int osmux_cid;
+
+
+ if (strstr(line + 2, "Osmux: *")) {
+ LOGP(DLMGCP, LOGL_DEBUG, "Parsed wilcard Osmux CID\n");
+ return -1;
+ }
+
+ if (sscanf(line + 2, "Osmux: %u", &osmux_cid) != 1) {
+ LOGP(DLMGCP, LOGL_ERROR, "Failed parsing Osmux in MGCP msg line: %s\n",
+ line);
+ return -2;
+ }
+
+#ifndef OSMUX_CID_MAX
+#define OSMUX_CID_MAX 255 /* FIXME: use OSMUX_CID_MAX from libosmo-netif? */
+#endif
+ if (osmux_cid > OSMUX_CID_MAX) { /* OSMUX_CID_MAX from libosmo-netif */
+ LOGP(DLMGCP, LOGL_ERROR, "Osmux ID too large: %u > %u\n",
+ osmux_cid, OSMUX_CID_MAX);
+ return -2;
+ }
+ LOGP(DLMGCP, LOGL_DEBUG, "bsc-nat offered Osmux CID %u\n", osmux_cid);
+
+ return osmux_cid;
+}
+
/* A new section is marked by a double line break, check a few more
* patterns as there may be variants */
static char *mgcp_find_section_end(char *string)
@@ -567,6 +601,21 @@
if (rc)
goto exit;
break;
+ case 'X':
+ if (strncmp("Osmux: ", line + 2, strlen("Osmux: ")) == 0) {
+ rc = mgcp_parse_osmux_cid(line);
+ if (rc < 0) {
+ /* -1: we don't want wildcards in response. -2: error */
+ rc = -EINVAL;
+ goto exit;
+ }
+ r->head.x_osmo_osmux_use = true;
+ r->head.x_osmo_osmux_cid = (uint8_t) rc;
+ rc = 0;
+ break;
+ }
+ /* Ignore unknown X-headers */
+ break;
default:
/* skip unhandled parameters */
break;