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 1.2.2.2 2000/01/11 06:58:28 fenner Exp $"; 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/time.h> 59 #include <sys/types.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/ip_var.h> 65 #include <netinet/tcp.h> 66 #include <netinet/tcpip.h> 67 68 #define TELCMDS 69 #define TELOPTS 70 #include <arpa/telnet.h> 71 72 #include <stdio.h> 73 #ifdef __STDC__ 74 #include <stdlib.h> 75 #endif 76 #include <unistd.h> 77 #include <string.h> 78 79 #include "interface.h" 80 #include "addrtoname.h" 81 82 83 #ifndef TELCMD_FIRST 84 # define TELCMD_FIRST SE 85 #endif 86 87 void 88 telnet_print(register const u_char *sp, u_int length) 89 { 90 static char tnet[128]; 91 register int i, c, x; 92 register u_char *rcp; 93 int off, first = 1; 94 u_char *osp; 95 96 off = 0; 97 x = 0; 98 99 while (length > 0 && *sp == IAC) { 100 osp = (u_char *) sp; 101 tnet[0] = '\0'; 102 103 c = *sp++; 104 length--; 105 switch (*sp) { 106 case IAC: /* <IAC><IAC>! */ 107 if (length > 1 && sp[1] == IAC) { 108 (void)strcpy(tnet, "IAC IAC"); 109 } else { 110 length = 0; 111 continue; 112 } 113 break; 114 default: 115 c = *sp++; 116 length--; 117 if ((i = c - TELCMD_FIRST) < 0 118 || i > IAC - TELCMD_FIRST) { 119 (void)printf("unknown: ff%02x\n", c); 120 return; 121 } 122 switch (c) { 123 case DONT: 124 case DO: 125 case WONT: 126 case WILL: 127 case SB: 128 x = *sp++; /* option */ 129 length--; 130 if (x >= 0 && x < NTELOPTS) { 131 (void)sprintf(tnet, "%s %s", 132 telcmds[i], telopts[x]); 133 } else { 134 (void)sprintf(tnet, "%s %#x", 135 telcmds[i], x); 136 } 137 break; 138 default: 139 (void)strcpy(tnet, telcmds[i]); 140 } 141 if (c == SB) { 142 c = *sp++; 143 length--; 144 (void)strcat(tnet, c ? " SEND" : " IS '"); 145 rcp = (u_char *) sp; 146 i = strlen(tnet); 147 while (length > 0 && (x = *sp++) != IAC) 148 --length; 149 if (x == IAC) { 150 if (2 < vflag 151 && i + 16 + sp - rcp < sizeof(tnet)) { 152 (void)strncpy(&tnet[i], rcp, sp - rcp); 153 i += (sp - rcp) - 1; 154 tnet[i] = '\0'; 155 } else if (i + 8 < sizeof(tnet)) { 156 (void)strcat(&tnet[i], "..."); 157 } 158 if (*sp++ == SE 159 && i + 4 < sizeof(tnet)) 160 (void)strcat(tnet, c ? " SE" : "' SE"); 161 } else if (i + 16 < sizeof(tnet)) { 162 (void)strcat(tnet, " truncated!"); 163 } 164 } 165 break; 166 } 167 /* 168 * now print it 169 */ 170 if (Xflag && 2 < vflag) { 171 if (first) 172 printf("\nTelnet:\n"); 173 i = sp - osp; 174 hex_print_with_offset(osp, i, off); 175 off += i; 176 if (i > 8) 177 printf("\n\t\t\t\t%s", tnet); 178 else 179 printf("%*s\t%s", (8 - i) * 3, "", tnet); 180 } else { 181 printf("%s%s", (first) ? " [telnet " : ", ", tnet); 182 } 183 first = 0; 184 } 185 if (!first) { 186 if (Xflag && 2 < vflag) 187 printf("\n"); 188 else 189 printf("]"); 190 } 191 } 192