192 lines
5.1 KiB
C
192 lines
5.1 KiB
C
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/* $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[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-telnet.c,v 1.2.2.2 2000/01/11 06:58:28 fenner Exp $";
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#define TELCMDS
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#define TELOPTS
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#include <arpa/telnet.h>
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#include <stdio.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#endif
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#include <unistd.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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#ifndef TELCMD_FIRST
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# define TELCMD_FIRST SE
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#endif
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void
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telnet_print(register const u_char *sp, u_int length)
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{
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static char tnet[128];
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register int i, c, x;
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register u_char *rcp;
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int off, first = 1;
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u_char *osp;
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off = 0;
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x = 0;
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while (length > 0 && *sp == IAC) {
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osp = (u_char *) sp;
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tnet[0] = '\0';
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c = *sp++;
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length--;
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switch (*sp) {
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case IAC: /* <IAC><IAC>! */
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if (length > 1 && sp[1] == IAC) {
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(void)strcpy(tnet, "IAC IAC");
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} else {
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length = 0;
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continue;
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}
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break;
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default:
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c = *sp++;
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length--;
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if ((i = c - TELCMD_FIRST) < 0
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|| i > IAC - TELCMD_FIRST) {
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(void)printf("unknown: ff%02x\n", c);
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return;
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}
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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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x = *sp++; /* option */
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length--;
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if (x >= 0 && x < NTELOPTS) {
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(void)sprintf(tnet, "%s %s",
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telcmds[i], telopts[x]);
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} else {
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(void)sprintf(tnet, "%s %#x",
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telcmds[i], x);
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}
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break;
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default:
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(void)strcpy(tnet, telcmds[i]);
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}
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if (c == SB) {
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c = *sp++;
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length--;
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(void)strcat(tnet, c ? " SEND" : " IS '");
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rcp = (u_char *) sp;
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i = strlen(tnet);
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while (length > 0 && (x = *sp++) != IAC)
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--length;
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if (x == IAC) {
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if (2 < vflag
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&& i + 16 + sp - rcp < sizeof(tnet)) {
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(void)strncpy(&tnet[i], rcp, sp - rcp);
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i += (sp - rcp) - 1;
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tnet[i] = '\0';
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} else if (i + 8 < sizeof(tnet)) {
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(void)strcat(&tnet[i], "...");
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}
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if (*sp++ == SE
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&& i + 4 < sizeof(tnet))
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(void)strcat(tnet, c ? " SE" : "' SE");
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} else if (i + 16 < sizeof(tnet)) {
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(void)strcat(tnet, " truncated!");
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}
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}
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break;
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}
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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:\n");
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i = sp - osp;
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hex_print_with_offset(osp, i, off);
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off += i;
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if (i > 8)
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printf("\n\t\t\t\t%s", tnet);
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else
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printf("%*s\t%s", (8 - i) * 3, "", tnet);
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} else {
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printf("%s%s", (first) ? " [telnet " : ", ", tnet);
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}
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first = 0;
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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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