1 files changed, 94 insertions, 0 deletions
diff --git a/src/libcharon/plugins/unity/unity_narrow.c b/src/libcharon/plugins/unity/unity_narrow.c
new file mode 100644
index 000000000..dada26dc6
--- /dev/null
+++ b/src/libcharon/plugins/unity/unity_narrow.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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 General Public License
+ * for more details.
+ */
+
+#include "unity_narrow.h"
+
+#include <daemon.h>
+
+typedef struct private_unity_narrow_t private_unity_narrow_t;
+
+/**
+ * Private data of an unity_narrow_t object.
+ */
+struct private_unity_narrow_t {
+
+	/**
+	 * Public unity_narrow_t interface.
+	 */
+	unity_narrow_t public;
+
+	/**
+	 * Unity attribute handler
+	 */
+	unity_handler_t *handler;
+};
+
+METHOD(listener_t, narrow, bool,
+	private_unity_narrow_t *this, ike_sa_t *ike_sa, child_sa_t *child_sa,
+	narrow_hook_t type, linked_list_t *local, linked_list_t *remote)
+{
+	traffic_selector_t *current, *orig = NULL;
+	enumerator_t *enumerator;
+
+	if (type == NARROW_INITIATOR_POST_AUTH &&
+		remote->get_count(remote) == 1)
+	{
+		enumerator = this->handler->create_include_enumerator(this->handler,
+												ike_sa->get_unique_id(ike_sa));
+		while (enumerator->enumerate(enumerator, &current))
+		{
+			if (orig == NULL)
+			{	/* got one, replace original TS */
+				remote->remove_first(remote, (void**)&orig);
+			}
+			remote->insert_last(remote, orig->get_subset(orig, current));
+		}
+		enumerator->destroy(enumerator);
+		if (orig)
+		{
+			DBG1(DBG_CFG, "narrowed CHILD_SA to %N %#R",
+				 configuration_attribute_type_names,
+				 UNITY_SPLIT_INCLUDE, remote);
+			orig->destroy(orig);
+		}
+	}
+	return TRUE;
+}
+
+METHOD(unity_narrow_t, destroy, void,
+	private_unity_narrow_t *this)
+{
+	free(this);
+}
+
+/**
+ * See header
+ */
+unity_narrow_t *unity_narrow_create(unity_handler_t *handler)
+{
+	private_unity_narrow_t *this;
+
+	INIT(this,
+		.public = {
+			.listener = {
+				.narrow = _narrow,
+			},
+			.destroy = _destroy,
+		},
+		.handler = handler,
+	);
+
+	return &this->public;
+}