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library/DIAMETER_Emulation: initiate CER/CEA exchange in client mode

Change-Id: I7537b306c2a569e2232597f21e15d3cf4ec9a12c
Related: SYS#5602
---
M library/DIAMETER_Emulation.ttcn
1 file changed, 14 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/92/31292/1

diff --git a/library/DIAMETER_Emulation.ttcn b/library/DIAMETER_Emulation.ttcn
index 3fa6a5c..28db6b5 100644
--- a/library/DIAMETER_Emulation.ttcn
+++ b/library/DIAMETER_Emulation.ttcn
@@ -272,13 +272,14 @@
 }
 
 function main(DIAMETEROps ops, DIAMETER_conn_parameters p, charstring id) runs on DIAMETER_Emulation_CT {
+	var boolean server_mode := p.remote_sctp_port == -1;
 	var Result res;
 	g_diameter_id := id;
 	f_imsi_table_init();
 	f_expect_table_init();
 
 	map(self:DIAMETER, system:DIAMETER_CODEC_PT);
-	if (p.remote_sctp_port == -1) {
+	if (server_mode) {
 		res := DIAMETER_CodecPort_CtrlFunct.f_IPL4_listen(DIAMETER, p.local_ip, p.local_sctp_port, { sctp := valueof(ts_SCTP) });
 	} else {
 		res := DIAMETER_CodecPort_CtrlFunct.f_IPL4_connect(DIAMETER, p.remote_ip, p.remote_sctp_port,
@@ -290,6 +291,18 @@
 	}
 	g_diameter_conn_id := res.connId;
 
+	/* If in client mode, send CER immediately */
+	if (not server_mode) {
+		var template (value) PDU_DIAMETER req;
+		var PDU_DIAMETER rsp;
+
+		req := ts_DIA_CER(f_inet_addr(p.local_ip), p.vendor_app_id,
+				  orig_host := p.origin_host, orig_realm := p.origin_realm);
+		rsp := f_diameter_xceive(req, tr_DIAMETER_A(Capabilities_Exchange, req.application_id));
+		/* notify our user that the CER->CEA exchange has happened */
+		DIAMETER_UNIT.send(DiameterCapabilityExchgInd:{rx := rsp, tx := valueof(req)});
+	}
+
 	while (true) {
 		var DIAMETER_ConnHdlr vc_conn;
 		var template IMSI imsi_t;

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