/*

 * Copyright (c) 1983, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *	@(#)tftp.h	8.1 (Berkeley) 6/2/93

 */

#ifndef _ARPA_TFTP_H

#define	_ARPA_TFTP_H 1

/*

 * Trivial File Transfer Protocol (IEN-133)

 */

#define	SEGSIZE		512		/* data segment size */

/*

 * Packet types.

 */

#define	RRQ	01				/* read request */

#define	WRQ	02				/* write request */

#define	DATA	03				/* data packet */

#define	ACK	04				/* acknowledgement */

#define	ERROR	05				/* error code */

struct	tftphdr {

	short	th_opcode;			/* packet type */

	union {

		char	tu_padding[3];		/* sizeof() compat */

		struct {

			union {

				unsigned short	tu_block;	/* block # */

				short	tu_code;		/* error code */

			} __attribute__ ((__packed__)) th_u3;

			char tu_data[0];	/* data or error string */

		} __attribute__ ((__packed__)) th_u2;

		char	tu_stuff[0];		/* request packet stuff */

	} __attribute__ ((__packed__)) th_u1;

} __attribute__ ((__packed__));

#define	th_block	th_u1.th_u2.th_u3.tu_block

#define	th_code		th_u1.th_u2.th_u3.tu_code

#define	th_stuff	th_u1.tu_stuff

#define	th_data		th_u1.th_u2.tu_data

#define	th_msg		th_u1.th_u2.tu_data

/*

 * Error codes.

 */

#define	EUNDEF		0		/* not defined */

#define	ENOTFOUND	1		/* file not found */

#define	EACCESS		2		/* access violation */

#define	ENOSPACE	3		/* disk full or allocation exceeded */

#define	EBADOP		4		/* illegal TFTP operation */

#define	EBADID		5		/* unknown transfer ID */

#define	EEXISTS		6		/* file already exists */

#define	ENOUSER		7		/* no such user */

#endif /* arpa/tftp.h */