2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
22 /* \summary: Trivial File Transfer Protocol (TFTP) printer */
28 #include <netdissect-stdinc.h>
32 #include "netdissect.h"
36 * Trivial File Transfer Protocol (IEN-133)
42 #define RRQ 01 /* read request */
43 #define WRQ 02 /* write request */
44 #define DATA 03 /* data packet */
45 #define ACK 04 /* acknowledgement */
46 #define TFTP_ERROR 05 /* error code */
47 #define OACK 06 /* option acknowledgement */
50 unsigned short th_opcode; /* packet type */
52 unsigned short tu_block; /* block # */
53 unsigned short tu_code; /* error code */
54 char tu_stuff[1]; /* request packet stuff */
56 char th_data[1]; /* data or error string */
59 #define th_block th_u.tu_block
60 #define th_code th_u.tu_code
61 #define th_stuff th_u.tu_stuff
62 #define th_msg th_data
67 #define EUNDEF 0 /* not defined */
68 #define ENOTFOUND 1 /* file not found */
69 #define EACCESS 2 /* access violation */
70 #define ENOSPACE 3 /* disk full or allocation exceeded */
71 #define EBADOP 4 /* illegal TFTP operation */
72 #define EBADID 5 /* unknown transfer ID */
73 #define EEXISTS 6 /* file already exists */
74 #define ENOUSER 7 /* no such user */
76 static const char tstr[] = " [|tftp]";
78 /* op code to string mapping */
79 static const struct tok op2str[] = {
80 { RRQ, "RRQ" }, /* read request */
81 { WRQ, "WRQ" }, /* write request */
82 { DATA, "DATA" }, /* data packet */
83 { ACK, "ACK" }, /* acknowledgement */
84 { TFTP_ERROR, "ERROR" }, /* error code */
85 { OACK, "OACK" }, /* option acknowledgement */
89 /* error code to string mapping */
90 static const struct tok err2str[] = {
91 { EUNDEF, "EUNDEF" }, /* not defined */
92 { ENOTFOUND, "ENOTFOUND" }, /* file not found */
93 { EACCESS, "EACCESS" }, /* access violation */
94 { ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */
95 { EBADOP, "EBADOP" }, /* illegal TFTP operation */
96 { EBADID, "EBADID" }, /* unknown transfer ID */
97 { EEXISTS, "EEXISTS" }, /* file already exists */
98 { ENOUSER, "ENOUSER" }, /* no such user */
103 * Print trivial file transfer program requests
106 tftp_print(netdissect_options *ndo,
107 register const u_char *bp, u_int length)
109 register const struct tftphdr *tp;
110 register const char *cp;
111 register const u_char *p;
115 tp = (const struct tftphdr *)bp;
118 ND_PRINT((ndo, " %d", length));
120 /* Print tftp request type */
123 ND_TCHECK(tp->th_opcode);
124 opcode = EXTRACT_16BITS(&tp->th_opcode);
125 cp = tok2str(op2str, "tftp-#%d", opcode);
127 ND_PRINT((ndo, " %s", cp));
128 /* Bail if bogus opcode */
136 p = (const u_char *)tp->th_stuff;
139 ND_PRINT((ndo, " "));
141 ND_PRINT((ndo, "\""));
142 ui = fn_printztn(ndo, p, length, ndo->ndo_snapend);
143 ND_PRINT((ndo, "\""));
149 /* Print the mode - RRQ and WRQ only */
151 goto trunc; /* no mode */
152 ND_PRINT((ndo, " "));
153 ui = fn_printztn(ndo, p, length, ndo->ndo_snapend);
159 /* Print options, if any */
160 while (length != 0) {
163 ND_PRINT((ndo, " "));
164 ui = fn_printztn(ndo, p, length, ndo->ndo_snapend);
173 p = (const u_char *)tp->th_stuff;
175 while (length != 0) {
178 ND_PRINT((ndo, " "));
179 ui = fn_printztn(ndo, p, length, ndo->ndo_snapend);
190 goto trunc; /* no block number */
191 ND_TCHECK(tp->th_block);
192 ND_PRINT((ndo, " block %d", EXTRACT_16BITS(&tp->th_block)));
196 /* Print error code string */
198 goto trunc; /* no error code */
199 ND_TCHECK(tp->th_code);
200 ND_PRINT((ndo, " %s", tok2str(err2str, "tftp-err-#%d \"",
201 EXTRACT_16BITS(&tp->th_code))));
203 /* Print error message string */
205 goto trunc; /* no error message */
206 ND_PRINT((ndo, " \""));
207 ui = fn_printztn(ndo, (const u_char *)tp->th_data, length, ndo->ndo_snapend);
208 ND_PRINT((ndo, "\""));
214 /* We shouldn't get here */
215 ND_PRINT((ndo, "(unknown #%d)", opcode));
220 ND_PRINT((ndo, "%s", tstr));