bus: Add an ike_update() hook invoked when peer endpoints change

src/libcharon/bus/bus.c

@@ -755,6 +755,33 @@ METHOD(bus_t, ike_rekey, void,
 	this->mutex->unlock(this->mutex);
 }
 
+METHOD(bus_t, ike_update, void,
+	private_bus_t *this, ike_sa_t *ike_sa, bool local, host_t *new)
+{
+	enumerator_t *enumerator;
+	entry_t *entry;
+	bool keep;
+
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->calling || !entry->listener->ike_update)
+		{
+			continue;
+		}
+		entry->calling++;
+		keep = entry->listener->ike_update(entry->listener, ike_sa, local, new);
+		entry->calling--;
+		if (!keep)
+		{
+			unregister_listener(this, entry, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
 METHOD(bus_t, ike_reestablish_pre, void,
 	private_bus_t *this, ike_sa_t *old, ike_sa_t *new)
 {
@@ -1006,6 +1033,7 @@ bus_t *bus_create()
 			.child_keys = _child_keys,
 			.ike_updown = _ike_updown,
 			.ike_rekey = _ike_rekey,
+			.ike_update = _ike_update,
 			.ike_reestablish_pre = _ike_reestablish_pre,
 			.ike_reestablish_post = _ike_reestablish_post,
 			.child_updown = _child_updown,

src/libcharon/bus/bus.h

@@ -381,6 +381,15 @@ struct bus_t {
 	 */
 	void (*ike_rekey)(bus_t *this, ike_sa_t *old, ike_sa_t *new);
 
+	/**
+	 * IKE_SA peer endpoint update hook.
+	 *
+	 * @param ike_sa	updated IKE_SA, having old endpoints set
+	 * @param local		TRUE if local endpoint gets updated, FALSE for remote
+	 * @param new		new endpoint address and port
+	 */
+	void (*ike_update)(bus_t *this, ike_sa_t *ike_sa, bool local, host_t *new);
+
 	/**
 	 * IKE_SA reestablishing hook (before resolving hosts).
 	 *

src/libcharon/bus/listeners/listener.h

@@ -127,6 +127,17 @@ struct listener_t {
 	 */
 	bool (*ike_rekey)(listener_t *this, ike_sa_t *old, ike_sa_t *new);
 
+	/**
+	 * Hook called for IKE_SA peer endpoint updates.
+	 *
+	 * @param ike_sa	updated IKE_SA, having old endpoints set
+	 * @param local		TRUE if local endpoint gets updated, FALSE for remote
+	 * @param new		new endpoint address and port
+	 * @return			TRUE to stay registered, FALSE to unregister
+	 */
+	bool (*ike_update)(listener_t *this, ike_sa_t *ike_sa,
+					   bool local, host_t *new);
+
 	/**
 	 * Hook called when an initiator reestablishes an IKE_SA.
 	 *

src/libcharon/sa/ike_sa.c

@@ -932,6 +932,7 @@ METHOD(ike_sa_t, update_hosts, void,
 		/* update our address in any case */
 		if (force && !me->equals(me, this->my_host))
 		{
+			charon->bus->ike_update(charon->bus, &this->public, TRUE, me);
 			set_my_host(this, me->clone(me));
 			update = TRUE;
 		}
@@ -945,6 +946,7 @@ METHOD(ike_sa_t, update_hosts, void,
 				(!has_condition(this, COND_NAT_HERE) ||
 				 !has_condition(this, COND_ORIGINAL_INITIATOR)))
 			{
+				charon->bus->ike_update(charon->bus, &this->public, FALSE, other);
 				set_other_host(this, other->clone(other));
 				update = TRUE;
 			}