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[] = 54 "@(#) $Header: /tcpdump/master/tcpdump/print-telnet.c,v 1.12 2000/09/29 04:58:51 guy Exp $"; 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/time.h> 59 #include <sys/types.h> 60 #include <ctype.h> 61 62 #include <netinet/in.h> 63 64 #define TELCMDS 65 #define TELOPTS 66 #include <arpa/telnet.h> 67 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <unistd.h> 71 #include <string.h> 72 73 #include "interface.h" 74 #include "addrtoname.h" 75 76 #ifndef TELCMD_FIRST 77 # define TELCMD_FIRST SE 78 #endif 79 80 void 81 telnet_print(register const u_char *sp, u_int length) 82 { 83 static char tnet[128]; 84 register int i, c, x; 85 register u_char *rcp; 86 int off, first = 1; 87 u_char *osp; 88 89 off = 0; 90 x = 0; 91 92 while (length > 0 && *sp == IAC) { 93 osp = (u_char *) sp; 94 tnet[0] = '\0'; 95 96 c = *sp++; 97 length--; 98 switch (*sp) { 99 case IAC: /* <IAC><IAC>! */ 100 if (length > 1 && sp[1] == IAC) { 101 (void)strcpy(tnet, "IAC IAC"); 102 } else { 103 length = 0; 104 continue; 105 } 106 break; 107 default: 108 c = *sp++; 109 length--; 110 if ((i = c - TELCMD_FIRST) < 0 111 || i > IAC - TELCMD_FIRST) { 112 (void)printf("unknown: ff%02x\n", c); 113 return; 114 } 115 switch (c) { 116 case DONT: 117 case DO: 118 case WONT: 119 case WILL: 120 case SB: 121 x = *sp++; /* option */ 122 length--; 123 if (x >= 0 && x < NTELOPTS) { 124 (void)snprintf(tnet, sizeof(tnet), 125 "%s %s", telcmds[i], telopts[x]); 126 } else { 127 (void)snprintf(tnet, sizeof(tnet), 128 "%s %#x", telcmds[i], x); 129 } 130 break; 131 default: 132 (void)snprintf(tnet, sizeof(tnet), "%s", 133 telcmds[i]); 134 } 135 if (c == SB) { 136 c = *sp++; 137 length--; 138 (void)strcat(tnet, c ? " SEND" : " IS '"); 139 rcp = (u_char *) sp; 140 i = strlen(tnet); 141 while (length > 0 && (x = *sp++) != IAC) 142 --length; 143 if (x == IAC) { 144 if (2 < vflag 145 && i + 16 + sp - rcp < sizeof(tnet)) { 146 (void)strncpy(&tnet[i], rcp, sp - rcp); 147 i += (sp - rcp) - 1; 148 tnet[i] = '\0'; 149 } else if (i + 8 < sizeof(tnet)) { 150 (void)strcat(&tnet[i], "..."); 151 } 152 if (*sp++ == SE 153 && i + 4 < sizeof(tnet)) 154 (void)strcat(tnet, c ? " SE" : "' SE"); 155 } else if (i + 16 < sizeof(tnet)) { 156 (void)strcat(tnet, " truncated!"); 157 } 158 } 159 break; 160 } 161 /* 162 * now print it 163 */ 164 if (Xflag && 2 < vflag) { 165 if (first) 166 printf("\nTelnet:\n"); 167 i = sp - osp; 168 hex_print_with_offset(osp, i, off); 169 off += i; 170 if (i > 8) 171 printf("\n\t\t\t\t"); 172 else 173 printf("%*s\t", (8 - i) * 3, ""); 174 safeputs(tnet); 175 } else { 176 printf("%s", (first) ? " [telnet " : ", "); 177 safeputs(tnet); 178 } 179 first = 0; 180 } 181 if (!first) { 182 if (Xflag && 2 < vflag) 183 printf("\n"); 184 else 185 printf("]"); 186 } 187 } 188