f49c5d523a
MFC after: 1 month
544 lines
15 KiB
C
544 lines
15 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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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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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 "interface.h"
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#define TELCMDS
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#define TELOPTS
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/* NetBSD: telnet.h,v 1.9 2001/06/11 01:50:50 wiz Exp */
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/*
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* Definitions for the TELNET protocol.
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*/
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#define IAC 255 /* interpret as command: */
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#define DONT 254 /* you are not to use option */
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#define DO 253 /* please, you use option */
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#define WONT 252 /* I won't use option */
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#define WILL 251 /* I will use option */
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#define SB 250 /* interpret as subnegotiation */
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#define GA 249 /* you may reverse the line */
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#define EL 248 /* erase the current line */
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#define EC 247 /* erase the current character */
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#define AYT 246 /* are you there */
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#define AO 245 /* abort output--but let prog finish */
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#define IP 244 /* interrupt process--permanently */
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#define BREAK 243 /* break */
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#define DM 242 /* data mark--for connect. cleaning */
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#define NOP 241 /* nop */
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#define SE 240 /* end sub negotiation */
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#define EOR 239 /* end of record (transparent mode) */
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#define ABORT 238 /* Abort process */
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#define SUSP 237 /* Suspend process */
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#define xEOF 236 /* End of file: EOF is already used... */
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#define SYNCH 242 /* for telfunc calls */
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#ifdef TELCMDS
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const char *telcmds[] = {
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"EOF", "SUSP", "ABORT", "EOR",
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"SE", "NOP", "DMARK", "BRK", "IP", "AO", "AYT", "EC",
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"EL", "GA", "SB", "WILL", "WONT", "DO", "DONT", "IAC", 0,
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};
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#else
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extern char *telcmds[];
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#endif
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#define TELCMD_FIRST xEOF
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#define TELCMD_LAST IAC
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#define TELCMD_OK(x) ((unsigned int)(x) <= TELCMD_LAST && \
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(unsigned int)(x) >= TELCMD_FIRST)
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#define TELCMD(x) telcmds[(x)-TELCMD_FIRST]
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/* telnet options */
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#define TELOPT_BINARY 0 /* 8-bit data path */
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#define TELOPT_ECHO 1 /* echo */
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#define TELOPT_RCP 2 /* prepare to reconnect */
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#define TELOPT_SGA 3 /* suppress go ahead */
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#define TELOPT_NAMS 4 /* approximate message size */
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#define TELOPT_STATUS 5 /* give status */
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#define TELOPT_TM 6 /* timing mark */
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#define TELOPT_RCTE 7 /* remote controlled transmission and echo */
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#define TELOPT_NAOL 8 /* negotiate about output line width */
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#define TELOPT_NAOP 9 /* negotiate about output page size */
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#define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
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#define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
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#define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
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#define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
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#define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
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#define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
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#define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
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#define TELOPT_XASCII 17 /* extended ascic character set */
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#define TELOPT_LOGOUT 18 /* force logout */
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#define TELOPT_BM 19 /* byte macro */
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#define TELOPT_DET 20 /* data entry terminal */
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#define TELOPT_SUPDUP 21 /* supdup protocol */
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#define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
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#define TELOPT_SNDLOC 23 /* send location */
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#define TELOPT_TTYPE 24 /* terminal type */
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#define TELOPT_EOR 25 /* end or record */
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#define TELOPT_TUID 26 /* TACACS user identification */
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#define TELOPT_OUTMRK 27 /* output marking */
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#define TELOPT_TTYLOC 28 /* terminal location number */
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#define TELOPT_3270REGIME 29 /* 3270 regime */
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#define TELOPT_X3PAD 30 /* X.3 PAD */
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#define TELOPT_NAWS 31 /* window size */
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#define TELOPT_TSPEED 32 /* terminal speed */
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#define TELOPT_LFLOW 33 /* remote flow control */
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#define TELOPT_LINEMODE 34 /* Linemode option */
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#define TELOPT_XDISPLOC 35 /* X Display Location */
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#define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
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#define TELOPT_AUTHENTICATION 37/* Authenticate */
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#define TELOPT_ENCRYPT 38 /* Encryption option */
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#define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
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#define TELOPT_EXOPL 255 /* extended-options-list */
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#define NTELOPTS (1+TELOPT_NEW_ENVIRON)
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#ifdef TELOPTS
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const char *telopts[NTELOPTS+1] = {
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"BINARY", "ECHO", "RCP", "SUPPRESS GO AHEAD", "NAME",
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"STATUS", "TIMING MARK", "RCTE", "NAOL", "NAOP",
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"NAOCRD", "NAOHTS", "NAOHTD", "NAOFFD", "NAOVTS",
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"NAOVTD", "NAOLFD", "EXTEND ASCII", "LOGOUT", "BYTE MACRO",
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"DATA ENTRY TERMINAL", "SUPDUP", "SUPDUP OUTPUT",
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"SEND LOCATION", "TERMINAL TYPE", "END OF RECORD",
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"TACACS UID", "OUTPUT MARKING", "TTYLOC",
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"3270 REGIME", "X.3 PAD", "NAWS", "TSPEED", "LFLOW",
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"LINEMODE", "XDISPLOC", "OLD-ENVIRON", "AUTHENTICATION",
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"ENCRYPT", "NEW-ENVIRON",
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0,
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};
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#define TELOPT_FIRST TELOPT_BINARY
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#define TELOPT_LAST TELOPT_NEW_ENVIRON
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#define TELOPT_OK(x) ((unsigned int)(x) <= TELOPT_LAST)
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#define TELOPT(x) telopts[(x)-TELOPT_FIRST]
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#endif
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/* sub-option qualifiers */
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#define TELQUAL_IS 0 /* option is... */
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#define TELQUAL_SEND 1 /* send option */
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#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
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#define TELQUAL_REPLY 2 /* AUTHENTICATION: client version of IS */
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#define TELQUAL_NAME 3 /* AUTHENTICATION: client version of IS */
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#define LFLOW_OFF 0 /* Disable remote flow control */
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#define LFLOW_ON 1 /* Enable remote flow control */
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#define LFLOW_RESTART_ANY 2 /* Restart output on any char */
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#define LFLOW_RESTART_XON 3 /* Restart output only on XON */
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/*
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* LINEMODE suboptions
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*/
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#define LM_MODE 1
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#define LM_FORWARDMASK 2
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#define LM_SLC 3
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#define MODE_EDIT 0x01
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#define MODE_TRAPSIG 0x02
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#define MODE_ACK 0x04
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#define MODE_SOFT_TAB 0x08
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#define MODE_LIT_ECHO 0x10
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#define MODE_MASK 0x1f
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#define SLC_SYNCH 1
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#define SLC_BRK 2
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#define SLC_IP 3
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#define SLC_AO 4
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#define SLC_AYT 5
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#define SLC_EOR 6
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#define SLC_ABORT 7
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#define SLC_EOF 8
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#define SLC_SUSP 9
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#define SLC_EC 10
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#define SLC_EL 11
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#define SLC_EW 12
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#define SLC_RP 13
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#define SLC_LNEXT 14
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#define SLC_XON 15
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#define SLC_XOFF 16
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#define SLC_FORW1 17
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#define SLC_FORW2 18
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#define SLC_MCL 19
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#define SLC_MCR 20
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#define SLC_MCWL 21
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#define SLC_MCWR 22
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#define SLC_MCBOL 23
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#define SLC_MCEOL 24
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#define SLC_INSRT 25
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#define SLC_OVER 26
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#define SLC_ECR 27
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#define SLC_EWR 28
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#define SLC_EBOL 29
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#define SLC_EEOL 30
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#define NSLC 30
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/*
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* For backwards compatibility, we define SLC_NAMES to be the
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* list of names if SLC_NAMES is not defined.
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*/
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#define SLC_NAMELIST "0", "SYNCH", "BRK", "IP", "AO", "AYT", "EOR", \
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"ABORT", "EOF", "SUSP", "EC", "EL", "EW", "RP", \
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"LNEXT", "XON", "XOFF", "FORW1", "FORW2", \
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"MCL", "MCR", "MCWL", "MCWR", "MCBOL", \
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"MCEOL", "INSRT", "OVER", "ECR", "EWR", \
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"EBOL", "EEOL", \
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0,
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#ifdef SLC_NAMES
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const char *slc_names[] = {
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SLC_NAMELIST
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};
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#else
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extern char *slc_names[];
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#define SLC_NAMES SLC_NAMELIST
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#endif
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#define SLC_NAME_OK(x) ((unsigned int)(x) <= NSLC)
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#define SLC_NAME(x) slc_names[x]
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#define SLC_NOSUPPORT 0
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#define SLC_CANTCHANGE 1
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#define SLC_VARIABLE 2
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#define SLC_DEFAULT 3
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#define SLC_LEVELBITS 0x03
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#define SLC_FUNC 0
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#define SLC_FLAGS 1
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#define SLC_VALUE 2
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#define SLC_ACK 0x80
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#define SLC_FLUSHIN 0x40
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#define SLC_FLUSHOUT 0x20
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#define OLD_ENV_VAR 1
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#define OLD_ENV_VALUE 0
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#define NEW_ENV_VAR 0
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#define NEW_ENV_VALUE 1
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#define ENV_ESC 2
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#define ENV_USERVAR 3
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/*
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* AUTHENTICATION suboptions
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*/
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/*
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* Who is authenticating who ...
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*/
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#define AUTH_WHO_CLIENT 0 /* Client authenticating server */
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#define AUTH_WHO_SERVER 1 /* Server authenticating client */
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#define AUTH_WHO_MASK 1
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#define AUTHTYPE_NULL 0
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#define AUTHTYPE_KERBEROS_V4 1
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#define AUTHTYPE_KERBEROS_V5 2
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#define AUTHTYPE_SPX 3
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#define AUTHTYPE_MINK 4
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#define AUTHTYPE_CNT 5
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#define AUTHTYPE_TEST 99
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#ifdef AUTH_NAMES
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const char *authtype_names[] = {
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"NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK", 0,
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};
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#else
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extern char *authtype_names[];
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#endif
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#define AUTHTYPE_NAME_OK(x) ((unsigned int)(x) < AUTHTYPE_CNT)
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#define AUTHTYPE_NAME(x) authtype_names[x]
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/*
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* ENCRYPTion suboptions
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*/
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#define ENCRYPT_IS 0 /* I pick encryption type ... */
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#define ENCRYPT_SUPPORT 1 /* I support encryption types ... */
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#define ENCRYPT_REPLY 2 /* Initial setup response */
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#define ENCRYPT_START 3 /* Am starting to send encrypted */
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#define ENCRYPT_END 4 /* Am ending encrypted */
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#define ENCRYPT_REQSTART 5 /* Request you start encrypting */
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#define ENCRYPT_REQEND 6 /* Request you send encrypting */
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#define ENCRYPT_ENC_KEYID 7
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#define ENCRYPT_DEC_KEYID 8
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#define ENCRYPT_CNT 9
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#define ENCTYPE_ANY 0
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#define ENCTYPE_DES_CFB64 1
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#define ENCTYPE_DES_OFB64 2
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#define ENCTYPE_CNT 3
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#ifdef ENCRYPT_NAMES
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const char *encrypt_names[] = {
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"IS", "SUPPORT", "REPLY", "START", "END",
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"REQUEST-START", "REQUEST-END", "ENC-KEYID", "DEC-KEYID",
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0,
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};
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const char *enctype_names[] = {
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"ANY", "DES_CFB64", "DES_OFB64", 0,
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};
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#else
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extern char *encrypt_names[];
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extern char *enctype_names[];
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#endif
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#define ENCRYPT_NAME_OK(x) ((unsigned int)(x) < ENCRYPT_CNT)
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#define ENCRYPT_NAME(x) encrypt_names[x]
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#define ENCTYPE_NAME_OK(x) ((unsigned int)(x) < ENCTYPE_CNT)
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#define ENCTYPE_NAME(x) enctype_names[x]
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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(netdissect_options *ndo, 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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ND_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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ND_PRINT((ndo, "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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ND_PRINT((ndo, "%s %s", telcmds[i], telopts[x]));
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} else {
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if (print)
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ND_PRINT((ndo, "%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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ND_PRINT((ndo, " %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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ND_PRINT((ndo, " %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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ND_PRINT((ndo, " %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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ND_PRINT((ndo, " %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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ND_PRINT((ndo, " %s", STR_OR_ID(c, cmds)));
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break;
|
|
}
|
|
while (p > sp) {
|
|
FETCH(x, sp, length);
|
|
if (print)
|
|
ND_PRINT((ndo, " %#x", x));
|
|
}
|
|
/* terminating IAC SE */
|
|
if (print)
|
|
ND_PRINT((ndo, " SE"));
|
|
sp += 2;
|
|
break;
|
|
default:
|
|
if (print)
|
|
ND_PRINT((ndo, "%s", telcmds[i]));
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
return sp - osp;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|telnet]"));
|
|
pktend:
|
|
return -1;
|
|
#undef FETCH
|
|
}
|
|
|
|
void
|
|
telnet_print(netdissect_options *ndo, const u_char *sp, u_int length)
|
|
{
|
|
int first = 1;
|
|
const u_char *osp;
|
|
int l;
|
|
|
|
osp = sp;
|
|
|
|
while (length > 0 && *sp == IAC) {
|
|
l = telnet_parse(ndo, sp, length, 0);
|
|
if (l < 0)
|
|
break;
|
|
|
|
/*
|
|
* now print it
|
|
*/
|
|
if (ndo->ndo_Xflag && 2 < ndo->ndo_vflag) {
|
|
if (first)
|
|
ND_PRINT((ndo, "\nTelnet:"));
|
|
hex_print_with_offset(ndo, "\n", sp, l, sp - osp);
|
|
if (l > 8)
|
|
ND_PRINT((ndo, "\n\t\t\t\t"));
|
|
else
|
|
ND_PRINT((ndo, "%*s\t", (8 - l) * 3, ""));
|
|
} else
|
|
ND_PRINT((ndo, "%s", (first) ? " [telnet " : ", "));
|
|
|
|
(void)telnet_parse(ndo, sp, length, 1);
|
|
first = 0;
|
|
|
|
sp += l;
|
|
length -= l;
|
|
}
|
|
if (!first) {
|
|
if (ndo->ndo_Xflag && 2 < ndo->ndo_vflag)
|
|
ND_PRINT((ndo, "\n"));
|
|
else
|
|
ND_PRINT((ndo, "]"));
|
|
}
|
|
}
|