/*      $NetBSD: tftp.h,v 1.8 2003/08/07 09:44:12 agc Exp $     */

/*
* 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.
* 3. 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_

/*
* Trivial File Transfer Protocol (IEN-133)
*/
#define SEGSIZE         512     /* data segment size */
#define MAXSEGSIZE      65464   /* maximum negotiated data segment size */

#define PKTSIZE         SEGSIZE + 4
#define MAXPKTSIZE      MAXSEGSIZE + 4

/*
* 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 */
#define OACK    06                      /* option acknowledgement */

struct  tftphdr {
       short   th_opcode;              /* packet type */
       union {
               unsigned short tu_block; /* block # */
               short   tu_code;        /* error code */
               char    tu_stuff[1];    /* request packet stuff */
       } th_u;
       char    th_data[1];             /* data or error string */
};

#define th_block        th_u.tu_block
#define th_code         th_u.tu_code
#define th_stuff        th_u.tu_stuff
#define th_msg          th_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 */
#define EOPTNEG         8               /* option negotiation failed */

#endif /* _ARPA_TFTP_H_ */