#
/* tftp.h */

/* EMACS_MODES: c !fill */


/*
 * This file contains the structure definitions for tftp packets.
 */


#define	DATALEN	512		/* size of data portion of tftp pkt */


struct	tftp_rfc	{
	char	f_fname[];	/* Remote file name */
	char	f_null1;	/* Zero */
	char	f_mode[];	/* netascii or image */
	char	f_null2;	/* Zero */
};

struct	tftp_data{
	short unsigned	f_blkno;	/* Block number */
	char		f_blk[DATALEN];	/* Data */
};

struct tftp_error{
	short	f_errcode;	/* Error code */
	char	f_errmsg[];	/* Error message */
	char	f_null3;	/* Zero */
};

struct	tftp	{
	short		fp_opcode;	/* header */
	union	{	struct	tftp_rfc	f_rfc;
			struct	tftp_data	f_data;
			struct	tftp_error	f_error;
		} fp_data;
};

	/* values for f_opcode */
#define	RRQ	1	/* Read Request */
#define	WRQ	2	/* Write Request */
#define	DATA	3	/* Data block */
#define	DACK	4	/* Data Acknowledge */
#define	ERROR	5	/* Error */

#define	TFTPSOCK	69		/* tftp socket number */
#define TFTPSIZ		sizeof(struct tftp)

/* values for error codes in ERROR packets */

#define TEUNDEF	0	/* Not defined, see error message (if any) */
#define TEFNF	1	/* File not found */
#define TEACESS	2	/* Access violation */
#define TEFULL	3	/* Disc full or allocation exceeded */
#define TETFTP	4	/* Illegal TFTP operation */
#define TETID	5	/* Unknown transfer ID */
#define	TEEXIST	6	/* File already exists */
#define TENOUSR	7	/* Bad user id for mail */
#define	MAXECODE	TENOUSR

/* Random constants */

#define	READ	RRQ	/* read requested */
#define	WRITE	WRQ	/* write requested */

#define	NETASCII	0		/* netascii transfer mode */
#define	IMAGE		1		/* image transfer mode */
#define	MAIL		2		/* mail transfer mode */