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+/**
+ * @file state.h
+ * 
+ * @brief Interface for a specific IKE_SA state
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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 STATE_H_
+#define STATE_H_
+
+#include <definitions.h>
+#include <types.h>
+#include <encoding/message.h>
+
+extern mapping_t ike_sa_state_m[];
+
+/**
+ * States in which a IKE_SA can actually be
+ */
+typedef enum ike_sa_state_e ike_sa_state_t;
+
+enum ike_sa_state_e {
+
+	/**
+	 * IKE_SA is is not in a state as initiator
+	 */
+	INITIATOR_INIT = 1,
+
+	/**
+	 * IKE_SA is is not in a state as responder
+	 */
+	RESPONDER_INIT = 2,
+
+	/**
+	 * A IKE_SA_INIT-message was sent: role initiator
+	 */
+	IKE_SA_INIT_REQUESTED = 3,
+
+	/**
+	 * A IKE_SA_INIT-message was replied: role responder
+	 */
+	IKE_SA_INIT_RESPONDED = 4,
+
+	/**
+	 * An IKE_AUTH-message was sent after a successful
+	 * IKE_SA_INIT-exchange: role initiator
+	 */
+	IKE_AUTH_REQUESTED = 5,
+
+	/**
+	 * An IKE_AUTH-message was replied: role responder.
+	 * In this state, all the informations for an IKE_SA
+	 * and one CHILD_SA are known.
+	 */
+	IKE_SA_ESTABLISHED = 6
+};
+
+/**
+ * string mappings for ike_sa_state_t
+ */
+extern mapping_t ike_sa_state_m[];
+
+/**
+ * @brief This interface represents an IKE_SA state
+ *
+ */
+typedef struct state_s state_t;
+
+struct state_s {
+
+	/**
+	 * @brief Processes a incoming IKEv2-Message of type message_t
+	 *
+	 * @param this 			state_t object
+ 	 * @param[in] 			message message_t object to process
+	 * @param this 			state_t pointer to the new state_t object
+	 * @return 				
+	 * 						- SUCCESSFUL if succeeded
+	 * 						- FAILED otherwise
+	 */
+	status_t (*process_message) (state_t *this,message_t *message,state_t **new_state);
+
+
+	/**
+	 * @brief Get the current state
+	 *
+	 * @param this 	state_t object
+	 * @return 		state 
+	 */
+	ike_sa_state_t (*get_state) (state_t *this);
+
+	/**
+	 * @brief Destroys a state_t object
+	 *
+	 * @param this 	state_t object
+	 * @return		SUCCESS in any case
+	 */
+	status_t (*destroy) (state_t *this);
+};
+
+
+#endif /*STATE_H_*/