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diff --git a/src/libradius/radius_server.h b/src/libradius/radius_server.h
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+++ b/src/libradius/radius_server.h
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+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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_server radius_server
+ * @{ @ingroup libradius
+ */
+
+#ifndef RADIUS_SERVER_H_
+#define RADIUS_SERVER_H_
+
+typedef struct radius_server_t radius_server_t;
+
+#include "radius_socket.h"
+
+/**
+ * RADIUS server configuration.
+ */
+struct radius_server_t {
+
+	/**
+	 * Get a RADIUS socket from the pool to communicate with this server.
+	 *
+	 * @return			RADIUS socket
+	 */
+	radius_socket_t* (*get_socket)(radius_server_t *this);
+
+	/**
+	 * Release a socket to the pool after use.
+	 *
+	 * @param skt		RADIUS socket to release
+	 * @param result	result of the socket use, TRUE for success
+	 */
+	void (*put_socket)(radius_server_t *this, radius_socket_t *skt, bool result);
+
+	/**
+	 * Get the NAS-Identifier to use with this server.
+	 *
+	 * @return			NAS-Identifier, internal data
+	 */
+	chunk_t (*get_nas_identifier)(radius_server_t *this);
+
+	/**
+	 * Get the preference of this server.
+	 *
+	 * Based on the available sockets and the server reachability a preference
+	 * value is calculated: better servers return a higher value.
+	 */
+	int (*get_preference)(radius_server_t *this);
+
+	/**
+	 * Get the name of the RADIUS server.
+	 *
+	 * @return			server name
+	 */
+	char* (*get_name)(radius_server_t *this);
+
+	/**
+	 * Increase reference count of this server.
+	 *
+	 * @return			this
+	 */
+	radius_server_t* (*get_ref)(radius_server_t *this);
+
+	/**
+	 * Destroy a radius_server_t.
+	 */
+	void (*destroy)(radius_server_t *this);
+};
+
+/**
+ * Create a radius_server instance.
+ *
+ * @param name				server name
+ * @param address			server address
+ * @param auth_port			server port for authentication
+ * @param acct_port			server port for accounting
+ * @param nas_identifier	NAS-Identifier to use with this server
+ * @param secret			secret to use with this server
+ * @param sockets			number of sockets to create in pool
+ * @param preference		preference boost for this server
+ */
+radius_server_t *radius_server_create(char *name, char *address,
+									  u_int16_t auth_port, u_int16_t acct_port,
+									  char *nas_identifier, char *secret,
+									  int sockets, int preference);
+
+#endif /** RADIUS_SERVER_H_ @}*/