/* * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 *	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: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Format and print trivial file transfer protocol packets. */#ifndef lintstatic const char rcsid[] _U_ =    "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.38.2.1 2008-04-11 16:44:17 gianluca Exp $ (LBL)";#endif#ifdef HAVE_CONFIG_H#include "config.h"#endif#include <tcpdump-stdinc.h>#ifdef SEGSIZE#undef SEGSIZE					/* SINIX sucks */#endif#include <stdio.h>#include <string.h>#include "interface.h"#include "addrtoname.h"#include "extract.h"#include "tftp.h"/* op code to string mapping */static struct tok op2str[] = {	{ RRQ,		"RRQ" },	/* read request */	{ WRQ,		"WRQ" },	/* write request */	{ DATA,		"DATA" },	/* data packet */	{ ACK,		"ACK" },	/* acknowledgement */	{ TFTP_ERROR,	"ERROR" },	/* error code */	{ OACK,		"OACK" },	/* option acknowledgement */	{ 0,		NULL }};/* error code to string mapping */static struct tok err2str[] = {	{ EUNDEF,	"EUNDEF" },	/* not defined */	{ ENOTFOUND,	"ENOTFOUND" },	/* file not found */	{ EACCESS,	"EACCESS" },	/* access violation */	{ ENOSPACE,	"ENOSPACE" },	/* disk full or allocation exceeded */	{ EBADOP,	"EBADOP" },	/* illegal TFTP operation */	{ EBADID,	"EBADID" },	/* unknown transfer ID */	{ EEXISTS,	"EEXISTS" },	/* file already exists */	{ ENOUSER,	"ENOUSER" },	/* no such user */	{ 0,		NULL }};/* * Print trivial file transfer program requests */voidtftp_print(register const u_char *bp, u_int length){	register const struct tftphdr *tp;	register const char *cp;	register const u_char *p;	register int opcode, i;	static char tstr[] = " [|tftp]";	tp = (const struct tftphdr *)bp;	/* Print length */	printf(" %d", length);	/* Print tftp request type */	TCHECK(tp->th_opcode);	opcode = EXTRACT_16BITS(&tp->th_opcode);	cp = tok2str(op2str, "tftp-#%d", opcode);	printf(" %s", cp);	/* Bail if bogus opcode */	if (*cp == 't')		return;	switch (opcode) {	case RRQ:	case WRQ:	case OACK:		/*		 * XXX Not all arpa/tftp.h's specify th_stuff as any		 * array; use address of th_block instead		 */#ifdef notdef		p = (u_char *)tp->th_stuff;#else		p = (u_char *)&tp->th_block;#endif		putchar(' ');		/* Print filename or first option */		if (opcode != OACK)			putchar('"');		i = fn_print(p, snapend);		if (opcode != OACK)			putchar('"');		/* Print the mode (RRQ and WRQ only) and any options */		while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {			if (length <= (u_int)(p - (const u_char *)&tp->th_block))				break;			p++;			if (*p != '\0') {				putchar(' ');				fn_print(p, snapend);			}		}				if (i)			goto trunc;		break;	case ACK:	case DATA:		TCHECK(tp->th_block);		printf(" block %d", EXTRACT_16BITS(&tp->th_block));		break;	case TFTP_ERROR:		/* Print error code string */		TCHECK(tp->th_code);		printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",				       EXTRACT_16BITS(&tp->th_code)));		/* Print error message string */		i = fn_print((const u_char *)tp->th_data, snapend);		putchar('"');		if (i)			goto trunc;		break;	default:		/* We shouldn't get here */		printf("(unknown #%d)", opcode);		break;	}	return;trunc:	fputs(tstr, stdout);	return;}