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diff --git a/src/libhydra/attributes/attribute_manager.h b/src/libhydra/attributes/attribute_manager.h
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+++ b/src/libhydra/attributes/attribute_manager.h
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+/*
+ * Copyright (C) 2008-2009 Martin Willi
+ * 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 attribute_manager attribute_manager
+ * @{ @ingroup attributes
+ */
+
+#ifndef ATTRIBUTE_MANAGER_H_
+#define ATTRIBUTE_MANAGER_H_
+
+#include "attribute_provider.h"
+#include "attribute_handler.h"
+
+typedef struct attribute_manager_t attribute_manager_t;
+
+/**
+ * The attribute manager hands out attributes or handles them.
+ *
+ * The attribute manager manages both, attribute providers and attribute
+ * handlers. Attribute providers are responsible to hand out attributes if
+ * a connecting peer requests them. Handlers handle such attributes if they
+ * are received on the requesting peer.
+ */
+struct attribute_manager_t {
+
+	/**
+	 * Acquire a virtual IP address to assign to a peer.
+	 *
+	 * @param pool			pool name to acquire address from
+	 * @param id			peer identity to get address forua
+	 * @param requested		IP in configuration request
+	 * @return				allocated address, NULL to serve none
+	 */
+	host_t* (*acquire_address)(attribute_manager_t *this,
+							   char *pool, identification_t *id,
+							   host_t *requested);
+
+	/**
+	 * Release a previously acquired address.
+	 *
+	 * @param pool			pool name from which the address was acquired
+	 * @param address		address to release
+	 * @param id			peer identity to get address for
+	 */
+	void (*release_address)(attribute_manager_t *this,
+							char *pool, host_t *address, identification_t *id);
+
+	/**
+	 * Create an enumerator over attributes to hand out to a peer.
+	 *
+	 * @param id			peer identity to hand out attributes to
+	 * @param vip			virtual IP to assign to peer, if any
+	 * @return				enumerator (configuration_attribute_type_t, chunk_t)
+	 */
+	enumerator_t* (*create_responder_enumerator)(attribute_manager_t *this,
+											identification_t *id, host_t *vip);
+
+	/**
+	 * Register an attribute provider to the manager.
+	 *
+	 * @param provider		attribute provider to register
+	 */
+	void (*add_provider)(attribute_manager_t *this,
+						 attribute_provider_t *provider);
+	/**
+	 * Unregister an attribute provider from the manager.
+	 *
+	 * @param provider		attribute provider to unregister
+	 */
+	void (*remove_provider)(attribute_manager_t *this,
+							attribute_provider_t *provider);
+
+	/**
+	 * Handle a configuration attribute by passing them to the handlers.
+	 *
+	 * @param server		server from which the attribute was received
+	 * @param handler		handler we requested the attribute for, if any
+	 * @param type			type of configuration attribute
+	 * @param data			associated attribute data
+	 * @return				handler which handled this attribute, NULL if none
+	 */
+	attribute_handler_t* (*handle)(attribute_manager_t *this,
+						identification_t *server, attribute_handler_t *handler,
+						configuration_attribute_type_t type, chunk_t data);
+
+	/**
+	 * Release an attribute previously handle()d by a handler.
+	 *
+	 * @param handler		handler returned by handle() for this attribute
+	 * @param server		server from which the attribute was received
+	 * @param type			type of attribute to release
+	 * @param data			associated attribute data
+	 */
+	void (*release)(attribute_manager_t *this, attribute_handler_t *handler,
+						identification_t *server,
+						configuration_attribute_type_t type,
+						chunk_t data);
+
+	/**
+	 * Create an enumerator over attributes to request from server.
+	 *
+	 * @param id			server identity to hand out attributes to
+	 * @param vip			virtual IP going to request, if any
+	 * @return				enumerator (attribute_handler_t, ca_type_t, chunk_t)
+	 */
+	enumerator_t* (*create_initiator_enumerator)(attribute_manager_t *this,
+											identification_t *id, host_t *vip);
+
+	/**
+	 * Register an attribute handler to the manager.
+	 *
+	 * @param handler		attribute handler to register
+	 */
+	void (*add_handler)(attribute_manager_t *this,
+						attribute_handler_t *handler);
+
+	/**
+	 * Unregister an attribute handler from the manager.
+	 *
+	 * @param handler		attribute handler to unregister
+	 */
+	void (*remove_handler)(attribute_manager_t *this,
+						   attribute_handler_t *handler);
+
+	/**
+	 * Destroy a attribute_manager instance.
+	 */
+	void (*destroy)(attribute_manager_t *this);
+};
+
+/**
+ * Create a attribute_manager instance.
+ */
+attribute_manager_t *attribute_manager_create();
+
+#endif /** ATTRIBUTE_MANAGER_H_ @}*/