restructuring of configuration backends

added propotypes of new control interfaces (xml & dbus)
introduced loadable:
  configuration backends
  control interfaces
using pluggable modules as in EAP

src/charon/control/interfaces/interface.h

@@ -0,0 +1,55 @@
+/**
+ * @file interface.h
+ *
+ * @brief Interface of interface_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 INTERFACE_H_
+#define INTERFACE_H_
+
+typedef struct interface_t interface_t;
+
+/**
+ * @brief Interface for a controller.
+ * 
+ * @b Constructors:
+ * - interface_create() of one of the modules
+ * 
+ * @ingroup interfaces
+ */
+struct interface_t {
+	
+	/**
+	 * @brief Destroy all interfaces
+	 * 
+	 * @param this		stroke_t objec to destroy
+	 */
+	void (*destroy) (interface_t *this);
+};
+
+
+/**
+ * Constructor in a control interface module to create the interface.
+ *
+ * @ingroup interfaces
+ */
+typedef interface_t*(*interface_constructor_t)(void);
+
+#endif /* INTERFACE_H_ */
+