add gsup_test to catch OS#3231

Encode an Insert Subscr Data with is_ps == true to trigger the encoding bug
described in OS#3231, i.e. show that it is fixed.

Move osmo_gsup_addr_send() to a separate .c file, so that it can be overridden
in the regression test to just dump the msgb instead.

I used this test to reproduce issue OS#3231, and now that it's here we might as
well keep it, and possibly expand on it in the future.

Related: OS#3231
Change-Id: Id1453351758f3e1a9ff03bd99fefaf51886e77da

1 files changed, 45 insertions, 0 deletions

diff --git a/src/gsup_send.c b/src/gsup_send.c
new file mode 100644
index 0000000..b2c4e02
--- /dev/null
+++ b/src/gsup_send.c
@@ -0,0 +1,45 @@
+/* (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/* This is kept separate to be able to override the actual sending functions from unit tests. */
+
+#include <errno.h>
+
+#include "gsup_server.h"
+#include "gsup_router.h"
+
+#include <osmocom/core/logging.h>
+
+/* Send a msgb to a given address using routing */
+int osmo_gsup_addr_send(struct osmo_gsup_server *gs,
+			const uint8_t *addr, size_t addrlen,
+			struct msgb *msg)
+{
+	struct osmo_gsup_conn *conn;
+
+	conn = gsup_route_find(gs, addr, addrlen);
+	if (!conn) {
+		DEBUGP(DLGSUP, "Cannot find route for addr %s\n", addr);
+		msgb_free(msg);
+		return -ENODEV;
+	}
+
+	return osmo_gsup_conn_send(conn, msg);
+}
+