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diff --git a/src/libradius/radius_client.h b/src/libradius/radius_client.h
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+/*
+ * Copyright (C) 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 radius_client radius_client
+ * @{ @ingroup libradius
+ */
+
+#ifndef RADIUS_CLIENT_H_
+#define RADIUS_CLIENT_H_
+
+#include "radius_message.h"
+#include "radius_server.h"
+
+typedef struct radius_client_t radius_client_t;
+
+/**
+ * RADIUS client functionality.
+ *
+ * To communicate with a RADIUS server, create a client and send messages over
+ * it. The client allocates a socket from the best RADIUS server abailable.
+ */
+struct radius_client_t {
+
+	/**
+	 * Send a RADIUS request and wait for the response.
+	 *
+	 * The client fills in NAS-Identifier nad NAS-Port-Type
+	 *
+	 * @param msg			RADIUS request message to send
+	 * @return				response, NULL if timed out/verification failed
+	 */
+	radius_message_t* (*request)(radius_client_t *this, radius_message_t *msg);
+
+	/**
+	 * Get the EAP MSK after successful RADIUS authentication.
+	 *
+	 * @return				MSK, allocated
+	 */
+	chunk_t (*get_msk)(radius_client_t *this);
+
+	/**
+	 * Destroy the client, release the socket.
+	 */
+	void (*destroy)(radius_client_t *this);
+};
+
+/**
+ * Create a RADIUS client.
+ *
+ * @param server	reference to a server configuration, gets owned
+ * @return			radius_client_t object
+ */
+radius_client_t *radius_client_create(radius_server_t *server);
+
+#endif /** RADIUS_CLIENT_H_ @}*/