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 22 /* \summary: Trivial File Transfer Protocol (TFTP) printer */ 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #include <netdissect-stdinc.h> 29 30 #include <string.h> 31 32 #include "netdissect.h" 33 #include "extract.h" 34 35 /* 36 * Trivial File Transfer Protocol (IEN-133) 37 */ 38 39 /* 40 * Packet types. 41 */ 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 */ 48 49 /* 50 * Error codes. 51 */ 52 #define EUNDEF 0 /* not defined */ 53 #define ENOTFOUND 1 /* file not found */ 54 #define EACCESS 2 /* access violation */ 55 #define ENOSPACE 3 /* disk full or allocation exceeded */ 56 #define EBADOP 4 /* illegal TFTP operation */ 57 #define EBADID 5 /* unknown transfer ID */ 58 #define EEXISTS 6 /* file already exists */ 59 #define ENOUSER 7 /* no such user */ 60 61 static const char tstr[] = " [|tftp]"; 62 63 /* op code to string mapping */ 64 static const struct tok op2str[] = { 65 { RRQ, "RRQ" }, /* read request */ 66 { WRQ, "WRQ" }, /* write request */ 67 { DATA, "DATA" }, /* data packet */ 68 { ACK, "ACK" }, /* acknowledgement */ 69 { TFTP_ERROR, "ERROR" }, /* error code */ 70 { OACK, "OACK" }, /* option acknowledgement */ 71 { 0, NULL } 72 }; 73 74 /* error code to string mapping */ 75 static const struct tok err2str[] = { 76 { EUNDEF, "EUNDEF" }, /* not defined */ 77 { ENOTFOUND, "ENOTFOUND" }, /* file not found */ 78 { EACCESS, "EACCESS" }, /* access violation */ 79 { ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */ 80 { EBADOP, "EBADOP" }, /* illegal TFTP operation */ 81 { EBADID, "EBADID" }, /* unknown transfer ID */ 82 { EEXISTS, "EEXISTS" }, /* file already exists */ 83 { ENOUSER, "ENOUSER" }, /* no such user */ 84 { 0, NULL } 85 }; 86 87 /* 88 * Print trivial file transfer program requests 89 */ 90 void 91 tftp_print(netdissect_options *ndo, 92 register const u_char *bp, u_int length) 93 { 94 register const char *cp; 95 register int opcode; 96 u_int ui; 97 98 /* Print length */ 99 ND_PRINT((ndo, " %d", length)); 100 101 /* Print tftp request type */ 102 if (length < 2) 103 goto trunc; 104 ND_TCHECK_16BITS(bp); 105 opcode = EXTRACT_16BITS(bp); 106 cp = tok2str(op2str, "tftp-#%d", opcode); 107 ND_PRINT((ndo, " %s", cp)); 108 /* Bail if bogus opcode */ 109 if (*cp == 't') 110 return; 111 bp += 2; 112 length -= 2; 113 114 switch (opcode) { 115 116 case RRQ: 117 case WRQ: 118 if (length == 0) 119 goto trunc; 120 ND_PRINT((ndo, " ")); 121 /* Print filename */ 122 ND_PRINT((ndo, "\"")); 123 ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend); 124 ND_PRINT((ndo, "\"")); 125 if (ui == 0) 126 goto trunc; 127 bp += ui; 128 length -= ui; 129 130 /* Print the mode - RRQ and WRQ only */ 131 if (length == 0) 132 goto trunc; /* no mode */ 133 ND_PRINT((ndo, " ")); 134 ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend); 135 if (ui == 0) 136 goto trunc; 137 bp += ui; 138 length -= ui; 139 140 /* Print options, if any */ 141 while (length != 0) { 142 ND_TCHECK(*bp); 143 if (*bp != '\0') 144 ND_PRINT((ndo, " ")); 145 ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend); 146 if (ui == 0) 147 goto trunc; 148 bp += ui; 149 length -= ui; 150 } 151 break; 152 153 case OACK: 154 /* Print options */ 155 while (length != 0) { 156 ND_TCHECK(*bp); 157 if (*bp != '\0') 158 ND_PRINT((ndo, " ")); 159 ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend); 160 if (ui == 0) 161 goto trunc; 162 bp += ui; 163 length -= ui; 164 } 165 break; 166 167 case ACK: 168 case DATA: 169 if (length < 2) 170 goto trunc; /* no block number */ 171 ND_TCHECK_16BITS(bp); 172 ND_PRINT((ndo, " block %d", EXTRACT_16BITS(bp))); 173 break; 174 175 case TFTP_ERROR: 176 /* Print error code string */ 177 if (length < 2) 178 goto trunc; /* no error code */ 179 ND_TCHECK_16BITS(bp); 180 ND_PRINT((ndo, " %s", tok2str(err2str, "tftp-err-#%d \"", 181 EXTRACT_16BITS(bp)))); 182 bp += 2; 183 length -= 2; 184 /* Print error message string */ 185 if (length == 0) 186 goto trunc; /* no error message */ 187 ND_PRINT((ndo, " \"")); 188 ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend); 189 ND_PRINT((ndo, "\"")); 190 if (ui == 0) 191 goto trunc; 192 break; 193 194 default: 195 /* We shouldn't get here */ 196 ND_PRINT((ndo, "(unknown #%d)", opcode)); 197 break; 198 } 199 return; 200 trunc: 201 ND_PRINT((ndo, "%s", tstr)); 202 return; 203 } 204