/*
 * Definitions for TFTP client and server.
 */

#include	<stdio.h>
#include	<sys/types.h>
#include	<setjmp.h>

#include	"systype.h"

#define	MAXBUFF		 2048	/* transmit and receive buffer length */
#define	MAXDATA		  512	/* max size of data per packet to send or rcv */
				/* 512 is specified by the RFC */
#define	MAXFILENAME	  128	/* max filename length */
#define	MAXHOSTNAME	  128	/* max host name length */
#define	MAXLINE		  512	/* max command line length */
#define	MAXTOKEN	  128	/* max token length */

#define	TFTP_SERVICE	"tftp"	/* name of the service */
#define	DAEMONLOG	"/tmp/tftpd.log"
				/* log file for daemon tracing */

/*
 * Externals.
 */

extern char	command[];	/* the command being processed */
extern int	connected;	/* true if we're connected to host */
extern char	hostname[];	/* name of host system */
extern int	inetdflag;	/* true if we were started by a daemon */
extern int	interactive;	/* true if we're running interactive */
extern jmp_buf	jmp_mainloop;	/* to return to main command loop */
extern int	lastsend;	/* #bytes of data in last data packet */
extern FILE	*localfp;	/* fp of local file to read or write */
extern int	modetype;	/* see MODE_xxx values */
extern int	nextblknum;	/* next block# to send/receive */
extern char	*pname;		/* the name by which we are invoked */
extern int	port;		/* port number - host byte order */
					/* 0 -> use default */
extern char	*prompt;	/* prompt string, for interactive use */
extern long	totnbytes;	/* for get/put statistics printing */
extern int	traceflag;	/* -t command line option, or "trace" cmd */
extern int	verboseflag;	/* -v command line option */

#define	MODE_ASCII	0	/* values for modetype */
				/* ascii == netascii */
#define	MODE_BINARY	1	/* binary == octet */

/*
 * One receive buffer and one transmit buffer.
 */

extern char	recvbuff[];
extern char	sendbuff[];
extern int	sendlen;	/* #bytes in sendbuff[] */

/*
 * Define the tftp opcodes.
 */

#define	OP_RRQ		1	/* Read Request */
#define	OP_WRQ		2	/* Write Request */
#define	OP_DATA		3	/* Data */
#define	OP_ACK		4	/* Acknowledgment */
#define	OP_ERROR	5	/* Error, see error codes below also */

#define	OP_MIN		1	/* minimum opcode value */
#define	OP_MAX		5	/* maximum opcode value */

extern int	op_sent;	/* last opcode sent */
extern int	op_recv;	/* last opcode received */

/*
 * Define the tftp error codes.
 * These are transmitted in an error packet (OP_ERROR) with an
 * optional netascii Error Message describing the error.
 */

#define	ERR_UNDEF	0	/* not defined, see error message */
#define	ERR_NOFILE	1	/* File not found */
#define	ERR_ACCESS	2	/* Access violation */
#define	ERR_NOSPACE	3	/* Disk full or allocation exceeded */
#define	ERR_BADOP	4	/* Illegal tftp operation */
#define	ERR_BADID	5	/* Unknown TID (port#) */
#define	ERR_FILE	6	/* File already exists */
#define	ERR_NOUSER	7	/* No such user */

/*
 * Debug macros, based on the trace flag (-t command line argument,
 * or "trace" command).
 */

#define	DEBUG1(fmt, arg1)	if (traceflag) { \
					fprintf(stderr, fmt, arg1); \
					fputc('\n', stderr); \
					fflush(stderr); \
				} else ;

#define	DEBUG2(fmt, arg1, arg2)	if (traceflag) { \
					fprintf(stderr, fmt, arg1, arg2); \
					fputc('\n', stderr); \
					fflush(stderr); \
				} else ;

/*
 * Define macros to load and store 2-byte integers, since these are
 * used in the TFTP headers for opcodes, block numbers and error
 * numbers.  These macros handle the conversion between host format
 * and network byte ordering.
 */

#define ldshort(addr)		( ntohs (*( (u_short *)(addr) ) ) )
#define	stshort(sval,addr)	( *( (u_short *)(addr) ) = htons(sval) )

#ifdef	lint		/* hush up lint */
#undef	ldshort
#undef	stshort
short	ldshort();
#endif	/* lint */

/*
 * Datatypes of functions that don't return an int.
 */

char	*gettoken();
FILE	*file_open();
double	t_getrtime();	/* our library routine to return elapsed time */
char	*sys_err_str();	/* our library routine for system error messages */