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diff --git a/src/charon/config/backends/writeable_backend.h b/src/charon/config/backends/writeable_backend.h
new file mode 100644
index 000000000..ea62f62c9
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+++ b/src/charon/config/backends/writeable_backend.h
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+/**
+ * @file writeable_backend.h
+ *
+ * @brief Interface of writeable_backend_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2007 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.
+ */
+ 
+#ifndef WRITEABLE_BACKEND_H_
+#define WRITEABLE_BACKEND_H_
+
+typedef struct writeable_backend_t writeable_backend_t;
+
+#include <library.h>
+#include <config/backends/backend.h>
+
+/**
+ * @brief A writeable backend extends backend_t by modification functions.
+ *
+ * @b Constructors:
+ *  - writeable_backend_create()
+ * 
+ * @ingroup backends
+ */
+struct writeable_backend_t {
+	
+	/**
+	 * Implements backend_t interface
+	 */
+	backend_t backend;
+	
+	/**
+	 * @brief Add a peer_config to the backend.
+	 *
+	 * @param this		calling object
+	 * @param config	peer_config to add to the backend
+	 */
+	void (*add_cfg)(writeable_backend_t *this, peer_cfg_t *config);
+	
+	/**
+	 * @brief Create an iterator over all peer configs.
+	 *
+	 * @param this		calling object
+	 * @return 			iterator over peer configs
+	 */
+	iterator_t* (*create_iterator)(writeable_backend_t *this);
+};
+
+#endif /* WRITEABLE_BACKEND_H_ */
+