Added a load tester strongswan.conf option to throttle initiation

src/libcharon/plugins/load_tester/load_tester_listener.c

@@ -47,12 +47,15 @@ struct private_load_tester_listener_t {
 	u_int shutdown_on;
 };
 
-METHOD(listener_t, ike_state_change, bool,
-	private_load_tester_listener_t *this, ike_sa_t *ike_sa, ike_sa_state_t state)
+METHOD(listener_t, ike_updown, bool,
+	private_load_tester_listener_t *this, ike_sa_t *ike_sa, bool up)
 {
-	if (state == IKE_ESTABLISHED)
+	if (up)
 	{
-		ike_sa_id_t *id = ike_sa->get_id(ike_sa);
+		ike_sa_id_t *id;
+
+		this->established++;
+		id = ike_sa->get_id(ike_sa);
 
 		if (this->delete_after_established)
 		{
@@ -62,16 +65,26 @@ METHOD(listener_t, ike_state_change, bool,
 
 		if (id->is_initiator(id))
 		{
-			if (this->shutdown_on == ++this->established)
+			if (this->shutdown_on == this->established)
 			{
 				DBG1(DBG_CFG, "load-test complete, raising SIGTERM");
 				kill(0, SIGTERM);
 			}
 		}
 	}
+	else
+	{
+		this->established--;
+	}
 	return TRUE;
 }
 
+METHOD(load_tester_listener_t, get_established, u_int,
+	private_load_tester_listener_t *this)
+{
+	return this->established;
+}
+
 METHOD(load_tester_listener_t, destroy, void,
 	private_load_tester_listener_t *this)
 {
@@ -85,8 +98,9 @@ load_tester_listener_t *load_tester_listener_create(u_int shutdown_on)
 	INIT(this,
 		.public = {
 			.listener = {
-				.ike_state_change = _ike_state_change,
+				.ike_updown = _ike_updown,
 			},
+			.get_established = _get_established,
 			.destroy = _destroy,
 		},
 		.delete_after_established = lib->settings->get_bool(lib->settings,

src/libcharon/plugins/load_tester/load_tester_listener.h

@@ -35,6 +35,13 @@ struct load_tester_listener_t {
 	 */
 	listener_t listener;
 
+	/**
+	 * Get the number of established IKE_SAs.
+	 *
+	 * @return			number of SAs currently established
+	 */
+	u_int (*get_established)(load_tester_listener_t *this);
+
 	/**
 	 * Destroy the backend.
 	 */

src/libcharon/plugins/load_tester/load_tester_plugin.c

@@ -77,6 +77,11 @@ struct private_load_tester_plugin_t {
 	 */
 	int delay;
 
+	/**
+	 * Throttle initiation if half-open IKE_SA count reached
+	 */
+	int init_limit;
+
 	/**
 	 * mutex to lock running field
 	 */
@@ -113,6 +118,23 @@ static job_requeue_t do_load_test(private_load_tester_plugin_t *this)
 		child_cfg_t *child_cfg = NULL;
 		enumerator_t *enumerator;
 
+		if (this->init_limit)
+		{
+			while ((charon->ike_sa_manager->get_count(charon->ike_sa_manager) -
+						this->listener->get_established(this->listener)) >
+					this->init_limit)
+			{
+				if (s)
+				{
+					sleep(s);
+				}
+				if (ms)
+				{
+					usleep(ms * 1000);
+				}
+			}
+		}
+
 		peer_cfg = charon->backends->get_peer_cfg_by_name(charon->backends,
 														  "load-test");
 		if (!peer_cfg)
@@ -206,6 +228,8 @@ plugin_t *load_tester_plugin_create()
 					"charon.plugins.load-tester.iterations", 1),
 		.initiators = lib->settings->get_int(lib->settings,
 					"charon.plugins.load-tester.initiators", 0),
+		.init_limit = lib->settings->get_int(lib->settings,
+					"charon.plugins.load-tester.init_limit", 0),
 		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
 		.condvar = condvar_create(CONDVAR_TYPE_DEFAULT),
 		.config = load_tester_config_create(),