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"
30 #include "netdissect.h"
34 * Trivial File Transfer Protocol (IEN-133)
40 #define RRQ 01 /* read request */
41 #define WRQ 02 /* write request */
42 #define DATA 03 /* data packet */
43 #define ACK 04 /* acknowledgement */
44 #define TFTP_ERROR 05 /* error code */
45 #define OACK 06 /* option acknowledgement */
50 #define EUNDEF 0 /* not defined */
51 #define ENOTFOUND 1 /* file not found */
52 #define EACCESS 2 /* access violation */
53 #define ENOSPACE 3 /* disk full or allocation exceeded */
54 #define EBADOP 4 /* illegal TFTP operation */
55 #define EBADID 5 /* unknown transfer ID */
56 #define EEXISTS 6 /* file already exists */
57 #define ENOUSER 7 /* no such user */
60 /* op code to string mapping */
61 static const struct tok op2str[] = {
62 { RRQ, "RRQ" }, /* read request */
63 { WRQ, "WRQ" }, /* write request */
64 { DATA, "DATA" }, /* data packet */
65 { ACK, "ACK" }, /* acknowledgement */
66 { TFTP_ERROR, "ERROR" }, /* error code */
67 { OACK, "OACK" }, /* option acknowledgement */
71 /* error code to string mapping */
72 static const struct tok err2str[] = {
73 { EUNDEF, "EUNDEF" }, /* not defined */
74 { ENOTFOUND, "ENOTFOUND" }, /* file not found */
75 { EACCESS, "EACCESS" }, /* access violation */
76 { ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */
77 { EBADOP, "EBADOP" }, /* illegal TFTP operation */
78 { EBADID, "EBADID" }, /* unknown transfer ID */
79 { EEXISTS, "EEXISTS" }, /* file already exists */
80 { ENOUSER, "ENOUSER" }, /* no such user */
85 * Print trivial file transfer program requests
88 tftp_print(netdissect_options *ndo,
89 const u_char *bp, u_int length)
95 ndo->ndo_protocol = "tftp";
98 nd_print_protocol_caps(ndo);
100 ND_PRINT(", length %u", length);
102 /* Print tftp request type */
105 opcode = GET_BE_U_2(bp);
106 cp = tok2str(op2str, "tftp-#%u", opcode);
107 ND_PRINT(", %s", cp);
108 /* Bail if bogus opcode */
123 ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
130 /* Print the mode - RRQ and WRQ only */
132 goto trunc; /* no mode */
134 ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
140 /* Print options, if any */
141 while (length != 0) {
142 if (GET_U_1(bp) != '\0')
144 ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
154 while (length != 0) {
155 if (GET_U_1(bp) != '\0')
157 ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
168 goto trunc; /* no block number */
169 ND_PRINT(" block %u", GET_BE_U_2(bp));
173 /* Print error code string */
175 goto trunc; /* no error code */
176 ND_PRINT(" %s", tok2str(err2str, "tftp-err-#%u \"",
180 /* Print error message string */
182 goto trunc; /* no error message */
184 ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
191 /* We shouldn't get here */
192 ND_PRINT("(unknown #%u)", opcode);