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diff --git a/src/pluto/whack_attribute.h b/src/pluto/whack_attribute.h
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+/*
+ * Copyright (C) 2010 Tobias Brunner
+ * 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 whack_attribute
+ * @{ @ingroup pluto
+ */
+
+#ifndef WHACK_ATTRIBUTE_H_
+#define WHACK_ATTRIBUTE_H_
+
+#include <whack.h>
+#include <attributes/attribute_provider.h>
+
+typedef struct whack_attribute_t whack_attribute_t;
+
+/**
+ * Whack attribute provider (basically an in-memory IP address pool)
+ */
+struct whack_attribute_t {
+
+	/**
+	 * Implements attribute provider interface
+	 */
+	attribute_provider_t provider;
+
+	/**
+	 * Add a virtual IP address pool.
+	 *
+	 * @param name		name of the pool
+	 * @param right		"right" end of whack message
+	 * @return			TRUE, if the pool was successfully added
+	 */
+	bool (*add_pool)(whack_attribute_t *this, const char *name,
+					 const whack_end_t *right);
+
+	/**
+	 * Remove a virtual IP address pool.
+	 *
+	 * @param name		name of the pool
+	 */
+	void (*del_pool)(whack_attribute_t *this, char *name);
+
+	/**
+	 * Create an enumerator over installed pools.
+	 *
+	 * Enumerator enumerates over
+	 * char *pool, u_int size, u_int offline, u_int online.
+	 *
+	 * @return			enumerator
+	 */
+	enumerator_t* (*create_pool_enumerator)(whack_attribute_t *this);
+
+	/**
+	 * Create an enumerator over the leases of a pool.
+	 *
+	 * Enumerator enumerates over
+	 * identification_t *id, host_t *address, bool online
+	 *
+	 * @param name		name of the pool to enumerate
+	 * @return			enumerator, NULL if pool not found
+	 */
+	enumerator_t* (*create_lease_enumerator)(whack_attribute_t *this,
+											 char *name);
+};
+
+/**
+ * Global object to manage pools. Set between calls to
+ * whack_attribute_initialize() and whack_attribute_finalize().
+ */
+extern whack_attribute_t *whack_attr;
+
+/**
+ * Initialize the whack attribute provider
+ */
+void whack_attribute_initialize();
+
+/**
+ * Finalize the whack attribute provider
+ */
+void whack_attribute_finalize();
+
+/**
+ * List the leases matching the given parameters.
+ *
+ * @param name		name of the pool, NULL for all pools
+ * @param addr		ip address of the lease to list, NULL to ignore
+ * @param id		id of the lease to list, NULL to ignore
+ */
+void list_leases(char *name, char *addr, char *id);
+
+/**
+ * List either all pools or the pool with a given name
+ *
+ * @param name		name of the pool, NULL for all pools
+ */
+void show_pools(const char *name);
+
+#endif /** WHACK_ATTRIBUTE_H_ @}*/