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diff --git a/src/libstrongswan/resolver/resolver_manager.h b/src/libstrongswan/resolver/resolver_manager.h
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+++ b/src/libstrongswan/resolver/resolver_manager.h
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+/*
+ * Copyright (C) 2011-2012 Reto Guadagnini
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.
+ */
+
+/**
+* @defgroup resolver_manager resolver_manager
+* @{ @ingroup resolver
+*/
+
+#ifndef RESOLVER_MANAGER_H_
+#define RESOLVER_MANAGER_H_
+
+typedef struct resolver_manager_t resolver_manager_t;
+
+#include <resolver/resolver.h>
+
+/**
+ * The resolver_manager manages the resolver implementations and
+ * creates instances of them.
+ *
+ * A resolver plugin is registered by providing its constructor function
+ * to the manager. The manager creates instances of the resolver plugin
+ * using the registered constructor function.
+ */
+struct resolver_manager_t {
+
+	/**
+	 * Register a resolver implementation.
+	 *
+	 * @param constructor	resolver constructor function
+	 */
+	void (*add_resolver)(resolver_manager_t *this,
+						 resolver_constructor_t constructor);
+
+	/**
+	 * Unregister a previously registered resolver implementation.
+	 *
+	 * @param constructor	resolver constructor function to unregister
+	 */
+	void (*remove_resolver)(resolver_manager_t *this,
+							resolver_constructor_t constructor);
+
+	/**
+	 * Get a new resolver instance.
+	 *
+	 * @return 				resolver instance.
+	 */
+	resolver_t* (*create)(resolver_manager_t *this);
+
+	/**
+	 * Destroy a resolver_manager instance.
+	 */
+	void (*destroy)(resolver_manager_t *this);
+};
+
+/**
+ * Create a resolver_manager instance.
+ */
+resolver_manager_t *resolver_manager_create();
+
+#endif /** RESOLVER_MANAGER_H_ @}*/