/*

 * Copyright (c) 2010-2011, Red Hat, Inc.

 *

 * Permission to use, copy, modify, and/or distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND RED HAT, INC. DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RED HAT, INC. BE LIABLE

 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * Author: Jan Friesse <jfriesse@redhat.com>

 */

#ifndef _MSG_H_

#define _MSG_H_

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/time.h>

#ifdef __cplusplus

extern "C" {

#endif

enum { MSG_DECODED_OPT_REQUEST_LEN = 16 };

enum msg_type {

	MSG_TYPE_INIT		= 'I',

	MSG_TYPE_RESPONSE	= 'S',

	MSG_TYPE_QUERY		= 'Q',

	MSG_TYPE_ANSWER		= 'A',

};

struct msg_decoded {

	struct timeval	 client_tstamp;

	struct timeval	 server_tstamp;

	enum msg_type	 msg_type;

	size_t		 client_id_len;

	size_t		 mcast_grp_len;

	size_t		 opt_request_len;

	size_t		 server_info_len;

	size_t		 ses_id_len;

	uint32_t	 seq_num;

	int		 client_tstamp_isset;

	int		 mcast_prefix_isset;

	int		 request_opt_server_info;

	int		 request_opt_server_tstamp;

	int		 seq_num_isset;

	int		 server_tstamp_isset;

	const char	*client_id;

	const char	*mcast_grp;

	const char	*server_info;

	const char	*ses_id;

	uint8_t		 ttl;

	uint8_t		 version;

};

extern size_t	msg_answer_create(const char *orig_msg, size_t orig_msg_len, char *new_msg,

    size_t new_msg_len, uint8_t ttl, int server_tstamp);

extern void	msg_decode(const char *msg, size_t msg_len, struct msg_decoded *decoded);

extern size_t	msg_init_create(char *msg, size_t msg_len, int req_si,

    const struct sockaddr_storage *mcast_addr, const char *client_id, size_t client_id_len);

extern size_t	msg_query_create(char *msg, size_t msg_len,

    const struct sockaddr_storage *mcast_addr, uint32_t seq_num, int server_tstamp,

    const char *client_id, size_t client_id_len, const char *session_id, size_t session_id_len);

extern size_t	msg_response_create(char *msg, size_t msg_len,

    const struct msg_decoded *msg_decoded, int mcast_grp, int mcast_prefix,

    const struct sockaddr_storage *mcast_addr, const char *session_id, size_t session_id_len);

extern int	msg_update_server_tstamp(char *msg, size_t msg_len);

#ifdef __cplusplus

}

#endif

#endif /* _MSG_H_ */