The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* $NetBSD: print-telnet.c,v 1.2 1999/10/11 12:40:12 sjg Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Simon J. Gerraty. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the NetBSD |
| 21 | * Foundation, Inc. and its contributors. |
| 22 | * 4. Neither the name of The NetBSD Foundation nor the names of its |
| 23 | * contributors may be used to endorse or promote products derived |
| 24 | * from this software without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 27 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 28 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 29 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 30 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 34 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 36 | * POSSIBILITY OF SUCH DAMAGE. |
| 37 | */ |
| 38 | /* |
| 39 | * @(#)Copyright (c) 1994, Simon J. Gerraty. |
| 40 | * |
| 41 | * This is free software. It comes with NO WARRANTY. |
| 42 | * Permission to use, modify and distribute this source code |
| 43 | * is granted subject to the following conditions. |
| 44 | * 1/ that the above copyright notice and this notice |
| 45 | * are preserved in all copies. |
| 46 | */ |
| 47 | |
| 48 | #ifdef HAVE_CONFIG_H |
| 49 | #include "config.h" |
| 50 | #endif |
| 51 | |
| 52 | #ifndef lint |
| 53 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 54 | "@(#) $Header: /tcpdump/master/tcpdump/print-telnet.c,v 1.24 2003-12-29 11:05:10 hannes Exp $"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 55 | #endif |
| 56 | |
| 57 | #include <tcpdump-stdinc.h> |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include <stdlib.h> |
| 61 | #include <string.h> |
| 62 | |
| 63 | #include "interface.h" |
| 64 | #include "addrtoname.h" |
| 65 | |
| 66 | #define TELCMDS |
| 67 | #define TELOPTS |
| 68 | #include "telnet.h" |
| 69 | |
| 70 | /* normal */ |
| 71 | static const char *cmds[] = { |
| 72 | "IS", "SEND", "INFO", |
| 73 | }; |
| 74 | |
| 75 | /* 37: Authentication */ |
| 76 | static const char *authcmd[] = { |
| 77 | "IS", "SEND", "REPLY", "NAME", |
| 78 | }; |
| 79 | static const char *authtype[] = { |
| 80 | "NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK", |
| 81 | "SRP", "RSA", "SSL", NULL, NULL, |
| 82 | "LOKI", "SSA", "KEA_SJ", "KEA_SJ_INTEG", "DSS", |
| 83 | "NTLM", |
| 84 | }; |
| 85 | |
| 86 | /* 38: Encryption */ |
| 87 | static const char *enccmd[] = { |
| 88 | "IS", "SUPPORT", "REPLY", "START", "END", |
| 89 | "REQUEST-START", "REQUEST-END", "END_KEYID", "DEC_KEYID", |
| 90 | }; |
| 91 | static const char *enctype[] = { |
| 92 | "NULL", "DES_CFB64", "DES_OFB64", "DES3_CFB64", "DES3_OFB64", |
| 93 | NULL, "CAST5_40_CFB64", "CAST5_40_OFB64", "CAST128_CFB64", "CAST128_OFB64", |
| 94 | }; |
| 95 | |
| 96 | #define STR_OR_ID(x, tab) \ |
| 97 | (((x) < sizeof(tab)/sizeof(tab[0]) && tab[(x)]) ? tab[(x)] : numstr(x)) |
| 98 | |
| 99 | static char * |
| 100 | numstr(int x) |
| 101 | { |
| 102 | static char buf[20]; |
| 103 | |
| 104 | snprintf(buf, sizeof(buf), "%#x", x); |
| 105 | return buf; |
| 106 | } |
| 107 | |
| 108 | /* sp points to IAC byte */ |
| 109 | static int |
| 110 | telnet_parse(const u_char *sp, u_int length, int print) |
| 111 | { |
| 112 | int i, x; |
| 113 | u_int c; |
| 114 | const u_char *osp, *p; |
| 115 | #define FETCH(c, sp, length) \ |
| 116 | do { \ |
| 117 | if (length < 1) \ |
| 118 | goto pktend; \ |
| 119 | TCHECK(*sp); \ |
| 120 | c = *sp++; \ |
| 121 | length--; \ |
| 122 | } while (0) |
| 123 | |
| 124 | osp = sp; |
| 125 | |
| 126 | FETCH(c, sp, length); |
| 127 | if (c != IAC) |
| 128 | goto pktend; |
| 129 | FETCH(c, sp, length); |
| 130 | if (c == IAC) { /* <IAC><IAC>! */ |
| 131 | if (print) |
| 132 | printf("IAC IAC"); |
| 133 | goto done; |
| 134 | } |
| 135 | |
| 136 | i = c - TELCMD_FIRST; |
| 137 | if (i < 0 || i > IAC - TELCMD_FIRST) |
| 138 | goto pktend; |
| 139 | |
| 140 | switch (c) { |
| 141 | case DONT: |
| 142 | case DO: |
| 143 | case WONT: |
| 144 | case WILL: |
| 145 | case SB: |
| 146 | /* DONT/DO/WONT/WILL x */ |
| 147 | FETCH(x, sp, length); |
| 148 | if (x >= 0 && x < NTELOPTS) { |
| 149 | if (print) |
| 150 | (void)printf("%s %s", telcmds[i], telopts[x]); |
| 151 | } else { |
| 152 | if (print) |
| 153 | (void)printf("%s %#x", telcmds[i], x); |
| 154 | } |
| 155 | if (c != SB) |
| 156 | break; |
| 157 | /* IAC SB .... IAC SE */ |
| 158 | p = sp; |
| 159 | while (length > (u_int)(p + 1 - sp)) { |
| 160 | if (p[0] == IAC && p[1] == SE) |
| 161 | break; |
| 162 | p++; |
| 163 | } |
| 164 | if (*p != IAC) |
| 165 | goto pktend; |
| 166 | |
| 167 | switch (x) { |
| 168 | case TELOPT_AUTHENTICATION: |
| 169 | if (p <= sp) |
| 170 | break; |
| 171 | FETCH(c, sp, length); |
| 172 | if (print) |
| 173 | (void)printf(" %s", STR_OR_ID(c, authcmd)); |
| 174 | if (p <= sp) |
| 175 | break; |
| 176 | FETCH(c, sp, length); |
| 177 | if (print) |
| 178 | (void)printf(" %s", STR_OR_ID(c, authtype)); |
| 179 | break; |
| 180 | case TELOPT_ENCRYPT: |
| 181 | if (p <= sp) |
| 182 | break; |
| 183 | FETCH(c, sp, length); |
| 184 | if (print) |
| 185 | (void)printf(" %s", STR_OR_ID(c, enccmd)); |
| 186 | if (p <= sp) |
| 187 | break; |
| 188 | FETCH(c, sp, length); |
| 189 | if (print) |
| 190 | (void)printf(" %s", STR_OR_ID(c, enctype)); |
| 191 | break; |
| 192 | default: |
| 193 | if (p <= sp) |
| 194 | break; |
| 195 | FETCH(c, sp, length); |
| 196 | if (print) |
| 197 | (void)printf(" %s", STR_OR_ID(c, cmds)); |
| 198 | break; |
| 199 | } |
| 200 | while (p > sp) { |
| 201 | FETCH(x, sp, length); |
| 202 | if (print) |
| 203 | (void)printf(" %#x", x); |
| 204 | } |
| 205 | /* terminating IAC SE */ |
| 206 | if (print) |
| 207 | (void)printf(" SE"); |
| 208 | sp += 2; |
| 209 | length -= 2; |
| 210 | break; |
| 211 | default: |
| 212 | if (print) |
| 213 | (void)printf("%s", telcmds[i]); |
| 214 | goto done; |
| 215 | } |
| 216 | |
| 217 | done: |
| 218 | return sp - osp; |
| 219 | |
| 220 | trunc: |
| 221 | (void)printf("[|telnet]"); |
| 222 | pktend: |
| 223 | return -1; |
| 224 | #undef FETCH |
| 225 | } |
| 226 | |
| 227 | void |
| 228 | telnet_print(const u_char *sp, u_int length) |
| 229 | { |
| 230 | int first = 1; |
| 231 | const u_char *osp; |
| 232 | int l; |
| 233 | |
| 234 | osp = sp; |
| 235 | |
| 236 | while (length > 0 && *sp == IAC) { |
| 237 | l = telnet_parse(sp, length, 0); |
| 238 | if (l < 0) |
| 239 | break; |
| 240 | |
| 241 | /* |
| 242 | * now print it |
| 243 | */ |
| 244 | if (Xflag && 2 < vflag) { |
| 245 | if (first) |
| 246 | printf("\nTelnet:"); |
| 247 | hex_print_with_offset("\n", sp, l, sp - osp); |
| 248 | if (l > 8) |
| 249 | printf("\n\t\t\t\t"); |
| 250 | else |
| 251 | printf("%*s\t", (8 - l) * 3, ""); |
| 252 | } else |
| 253 | printf("%s", (first) ? " [telnet " : ", "); |
| 254 | |
| 255 | (void)telnet_parse(sp, length, 1); |
| 256 | first = 0; |
| 257 | |
| 258 | sp += l; |
| 259 | length -= l; |
| 260 | } |
| 261 | if (!first) { |
| 262 | if (Xflag && 2 < vflag) |
| 263 | printf("\n"); |
| 264 | else |
| 265 | printf("]"); |
| 266 | } |
| 267 | } |