268 lines
6.2 KiB
C
268 lines
6.2 KiB
C
/* $NetBSD: print-telnet.c,v 1.2 1999/10/11 12:40:12 sjg Exp $ */
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/*-
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* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Simon J. Gerraty.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* @(#)Copyright (c) 1994, Simon J. Gerraty.
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*
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* This is free software. It comes with NO WARRANTY.
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* Permission to use, modify and distribute this source code
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* is granted subject to the following conditions.
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* 1/ that the above copyright notice and this notice
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* are preserved in all copies.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-telnet.c,v 1.24 2003/12/29 11:05:10 hannes Exp $";
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#define TELCMDS
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#define TELOPTS
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#include "telnet.h"
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/* normal */
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static const char *cmds[] = {
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"IS", "SEND", "INFO",
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};
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/* 37: Authentication */
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static const char *authcmd[] = {
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"IS", "SEND", "REPLY", "NAME",
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};
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static const char *authtype[] = {
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"NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK",
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"SRP", "RSA", "SSL", NULL, NULL,
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"LOKI", "SSA", "KEA_SJ", "KEA_SJ_INTEG", "DSS",
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"NTLM",
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};
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/* 38: Encryption */
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static const char *enccmd[] = {
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"IS", "SUPPORT", "REPLY", "START", "END",
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"REQUEST-START", "REQUEST-END", "END_KEYID", "DEC_KEYID",
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};
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static const char *enctype[] = {
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"NULL", "DES_CFB64", "DES_OFB64", "DES3_CFB64", "DES3_OFB64",
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NULL, "CAST5_40_CFB64", "CAST5_40_OFB64", "CAST128_CFB64", "CAST128_OFB64",
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};
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#define STR_OR_ID(x, tab) \
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(((x) < sizeof(tab)/sizeof(tab[0]) && tab[(x)]) ? tab[(x)] : numstr(x))
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static char *
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numstr(int x)
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{
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static char buf[20];
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snprintf(buf, sizeof(buf), "%#x", x);
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return buf;
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}
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/* sp points to IAC byte */
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static int
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telnet_parse(const u_char *sp, u_int length, int print)
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{
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int i, x;
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u_int c;
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const u_char *osp, *p;
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#define FETCH(c, sp, length) \
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do { \
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if (length < 1) \
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goto pktend; \
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TCHECK(*sp); \
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c = *sp++; \
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length--; \
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} while (0)
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osp = sp;
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FETCH(c, sp, length);
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if (c != IAC)
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goto pktend;
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FETCH(c, sp, length);
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if (c == IAC) { /* <IAC><IAC>! */
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if (print)
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printf("IAC IAC");
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goto done;
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}
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i = c - TELCMD_FIRST;
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if (i < 0 || i > IAC - TELCMD_FIRST)
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goto pktend;
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switch (c) {
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case DONT:
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case DO:
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case WONT:
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case WILL:
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case SB:
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/* DONT/DO/WONT/WILL x */
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FETCH(x, sp, length);
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if (x >= 0 && x < NTELOPTS) {
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if (print)
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(void)printf("%s %s", telcmds[i], telopts[x]);
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} else {
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if (print)
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(void)printf("%s %#x", telcmds[i], x);
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}
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if (c != SB)
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break;
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/* IAC SB .... IAC SE */
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p = sp;
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while (length > (u_int)(p + 1 - sp)) {
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if (p[0] == IAC && p[1] == SE)
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break;
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p++;
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}
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if (*p != IAC)
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goto pktend;
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switch (x) {
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case TELOPT_AUTHENTICATION:
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if (p <= sp)
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break;
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FETCH(c, sp, length);
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if (print)
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(void)printf(" %s", STR_OR_ID(c, authcmd));
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if (p <= sp)
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break;
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FETCH(c, sp, length);
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if (print)
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(void)printf(" %s", STR_OR_ID(c, authtype));
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break;
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case TELOPT_ENCRYPT:
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if (p <= sp)
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break;
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FETCH(c, sp, length);
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if (print)
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(void)printf(" %s", STR_OR_ID(c, enccmd));
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if (p <= sp)
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break;
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FETCH(c, sp, length);
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if (print)
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(void)printf(" %s", STR_OR_ID(c, enctype));
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break;
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default:
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if (p <= sp)
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break;
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FETCH(c, sp, length);
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if (print)
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(void)printf(" %s", STR_OR_ID(c, cmds));
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break;
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}
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while (p > sp) {
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FETCH(x, sp, length);
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if (print)
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(void)printf(" %#x", x);
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}
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/* terminating IAC SE */
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if (print)
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(void)printf(" SE");
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sp += 2;
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length -= 2;
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break;
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default:
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if (print)
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(void)printf("%s", telcmds[i]);
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goto done;
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}
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done:
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return sp - osp;
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trunc:
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(void)printf("[|telnet]");
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pktend:
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return -1;
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#undef FETCH
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}
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void
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telnet_print(const u_char *sp, u_int length)
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{
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int first = 1;
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const u_char *osp;
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int l;
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osp = sp;
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while (length > 0 && *sp == IAC) {
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l = telnet_parse(sp, length, 0);
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if (l < 0)
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break;
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/*
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* now print it
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*/
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if (Xflag && 2 < vflag) {
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if (first)
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printf("\nTelnet:");
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hex_print_with_offset("\n", sp, l, sp - osp);
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if (l > 8)
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printf("\n\t\t\t\t");
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else
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printf("%*s\t", (8 - l) * 3, "");
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} else
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printf("%s", (first) ? " [telnet " : ", ");
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(void)telnet_parse(sp, length, 1);
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first = 0;
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sp += l;
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length -= l;
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}
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if (!first) {
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if (Xflag && 2 < vflag)
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printf("\n");
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else
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printf("]");
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}
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}
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