Implement AoIP, port to M3UA SIGTRAN (large addition and refactoring)

This was originally a long series of commits converging to the final result
seen in this patch. It does not make much sense to review the smaller steps'
trial and error, we need to review this entire change as a whole.

Implement AoIP in osmo-msc and osmo-bsc.

Change over to the new libosmo-sigtran API with support for proper
SCCP/M3UA/SCTP stacking, as mandated by 3GPP specifications for the IuCS and
IuPS interfaces.

From here on, a separate osmo-stp process is required for SCCP routing between
OsmoBSC / OsmoHNBGW <-> OsmoMSC / OsmoSGSN

jenkins.sh: build from libosmo-sccp and osmo-iuh master branches now for new
M3UA SIGTRAN.

Patch-by: pmaier, nhofmeyr, laforge
Change-Id: I5ae4e05ee7c57cad341ea5e86af37c1f6b0ffa77

1 files changed, 43 insertions, 1 deletions

diff --git a/src/libmgcp/mgcp_protocol.c b/src/libmgcp/mgcp_protocol.c
index 96542c5a0..c8b6e8660 100644
--- a/src/libmgcp/mgcp_protocol.c
+++ b/src/libmgcp/mgcp_protocol.c
@@ -66,6 +66,45 @@ static int setup_rtp_processing(struct mgcp_endpoint *endp);
 
 static int mgcp_analyze_header(struct mgcp_parse_data *parse, char *data);
 
+/* Display an mgcp message on the log output */
+void display_mgcp_message(unsigned char *message, unsigned int len,
+			  char *preamble)
+{
+	unsigned char line[80];
+	unsigned char *ptr;
+	unsigned int consumed = 0;
+	unsigned int consumed_line = 0;
+	unsigned int line_count = 0;
+
+	if (!log_check_level(DMGCP, LOGL_DEBUG))
+		return;
+
+	while (1) {
+		memset(line, 0, sizeof(line));
+		ptr = line;
+		consumed_line = 0;
+		do {
+			if (*message != '\n' && *message != '\r') {
+				*ptr = *message;
+				ptr++;
+			}
+			message++;
+			consumed++;
+			consumed_line++;
+		} while (*message != '\n' && consumed < len
+			 && consumed_line < sizeof(line));
+
+		if (strlen((const char *)line)) {
+			LOGP(DMGCP, LOGL_DEBUG, "%s: line #%02u: %s\n",
+			     preamble, line_count, line);
+			line_count++;
+		}
+
+		if (consumed >= len)
+			return;
+	}
+}
+
 static int mgcp_check_param(const struct mgcp_endpoint *endp, const char *line)
 {
 	const size_t line_len = strlen(line);
@@ -157,7 +196,8 @@ static struct msgb *create_resp(struct mgcp_endpoint *endp, int code,
 	}
 
 	res->l2h = msgb_put(res, len);
-	LOGP(DMGCP, LOGL_DEBUG, "Generated response: code: %d for '%s'\n", code, res->l2h);
+	LOGP(DMGCP, LOGL_DEBUG, "Generated response: code=%d\n", code);
+	display_mgcp_message(res->l2h, msgb_l2len(res), "Generated response");
 
 	/*
 	 * Remember the last transmission per endpoint.
@@ -329,6 +369,8 @@ struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg)
 	if (mgcp_msg_terminate_nul(msg))
 		return NULL;
 
+	display_mgcp_message(msg->l2h, msgb_l2len(msg), "Received message");
+
         /* attempt to treat it as a response */
         if (sscanf((const char *)&msg->l2h[0], "%3d %*s", &code) == 1) {
 		LOGP(DMGCP, LOGL_DEBUG, "Response: Code: %d\n", code);