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      1 /*
      2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  *
     21  * Format and print trivial file transfer protocol packets.
     22  */
     23 
     24 #ifndef lint
     25 static const char rcsid[] _U_ =
     26     "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.39 2008-04-11 16:47:38 gianluca Exp $ (LBL)";
     27 #endif
     28 
     29 #ifdef HAVE_CONFIG_H
     30 #include "config.h"
     31 #endif
     32 
     33 #include <tcpdump-stdinc.h>
     34 
     35 #ifdef SEGSIZE
     36 #undef SEGSIZE					/* SINIX sucks */
     37 #endif
     38 
     39 #include <stdio.h>
     40 #include <string.h>
     41 
     42 #include "interface.h"
     43 #include "addrtoname.h"
     44 #include "extract.h"
     45 #include "tftp.h"
     46 
     47 /* op code to string mapping */
     48 static const struct tok op2str[] = {
     49 	{ RRQ,		"RRQ" },	/* read request */
     50 	{ WRQ,		"WRQ" },	/* write request */
     51 	{ DATA,		"DATA" },	/* data packet */
     52 	{ ACK,		"ACK" },	/* acknowledgement */
     53 	{ TFTP_ERROR,	"ERROR" },	/* error code */
     54 	{ OACK,		"OACK" },	/* option acknowledgement */
     55 	{ 0,		NULL }
     56 };
     57 
     58 /* error code to string mapping */
     59 static const struct tok err2str[] = {
     60 	{ EUNDEF,	"EUNDEF" },	/* not defined */
     61 	{ ENOTFOUND,	"ENOTFOUND" },	/* file not found */
     62 	{ EACCESS,	"EACCESS" },	/* access violation */
     63 	{ ENOSPACE,	"ENOSPACE" },	/* disk full or allocation exceeded */
     64 	{ EBADOP,	"EBADOP" },	/* illegal TFTP operation */
     65 	{ EBADID,	"EBADID" },	/* unknown transfer ID */
     66 	{ EEXISTS,	"EEXISTS" },	/* file already exists */
     67 	{ ENOUSER,	"ENOUSER" },	/* no such user */
     68 	{ 0,		NULL }
     69 };
     70 
     71 /*
     72  * Print trivial file transfer program requests
     73  */
     74 void
     75 tftp_print(register const u_char *bp, u_int length)
     76 {
     77 	register const struct tftphdr *tp;
     78 	register const char *cp;
     79 	register const u_char *p;
     80 	register int opcode, i;
     81 	static char tstr[] = " [|tftp]";
     82 
     83 	tp = (const struct tftphdr *)bp;
     84 
     85 	/* Print length */
     86 	printf(" %d", length);
     87 
     88 	/* Print tftp request type */
     89 	TCHECK(tp->th_opcode);
     90 	opcode = EXTRACT_16BITS(&tp->th_opcode);
     91 	cp = tok2str(op2str, "tftp-#%d", opcode);
     92 	printf(" %s", cp);
     93 	/* Bail if bogus opcode */
     94 	if (*cp == 't')
     95 		return;
     96 
     97 	switch (opcode) {
     98 
     99 	case RRQ:
    100 	case WRQ:
    101 	case OACK:
    102 		p = (u_char *)tp->th_stuff;
    103 		putchar(' ');
    104 		/* Print filename or first option */
    105 		if (opcode != OACK)
    106 			putchar('"');
    107 		i = fn_print(p, snapend);
    108 		if (opcode != OACK)
    109 			putchar('"');
    110 
    111 		/* Print the mode (RRQ and WRQ only) and any options */
    112 		while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
    113 			if (length <= (u_int)(p - (const u_char *)&tp->th_block))
    114 				break;
    115 			p++;
    116 			if (*p != '\0') {
    117 				putchar(' ');
    118 				fn_print(p, snapend);
    119 			}
    120 		}
    121 
    122 		if (i)
    123 			goto trunc;
    124 		break;
    125 
    126 	case ACK:
    127 	case DATA:
    128 		TCHECK(tp->th_block);
    129 		printf(" block %d", EXTRACT_16BITS(&tp->th_block));
    130 		break;
    131 
    132 	case TFTP_ERROR:
    133 		/* Print error code string */
    134 		TCHECK(tp->th_code);
    135 		printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",
    136 				       EXTRACT_16BITS(&tp->th_code)));
    137 		/* Print error message string */
    138 		i = fn_print((const u_char *)tp->th_data, snapend);
    139 		putchar('"');
    140 		if (i)
    141 			goto trunc;
    142 		break;
    143 
    144 	default:
    145 		/* We shouldn't get here */
    146 		printf("(unknown #%d)", opcode);
    147 		break;
    148 	}
    149 	return;
    150 trunc:
    151 	fputs(tstr, stdout);
    152 	return;
    153 }
    154