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
25static 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 */
48static 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 */
59static 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 */
74void
75tftp_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;
150trunc:
151	fputs(tstr, stdout);
152	return;
153}
154