1760 lines
42 KiB
C
1760 lines
42 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more
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* complete PPP support.
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*
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* $FreeBSD$
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*/
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/*
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* TODO:
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* o resolve XXX as much as possible
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* o MP support
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* o BAP support
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 hannes Exp $ (LBL)";
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#endif
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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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#ifdef __bsdi__
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#include <net/slcompress.h>
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#include <net/if_ppp.h>
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#endif
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#include <pcap.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ppp.h"
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#include "chdlc.h"
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#include "ethertype.h"
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#include "oui.h"
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/*
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* The following constatns are defined by IANA. Please refer to
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* http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
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* for the up-to-date information.
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*/
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/* Protocol Codes defined in ppp.h */
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struct tok ppptype2str[] = {
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{ PPP_IP, "IP" },
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{ PPP_OSI, "OSI" },
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{ PPP_NS, "NS" },
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{ PPP_DECNET, "DECNET" },
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{ PPP_APPLE, "APPLE" },
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{ PPP_IPX, "IPX" },
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{ PPP_VJC, "VJC IP" },
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{ PPP_VJNC, "VJNC IP" },
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{ PPP_BRPDU, "BRPDU" },
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{ PPP_STII, "STII" },
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{ PPP_VINES, "VINES" },
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{ PPP_MPLS_UCAST, "MPLS" },
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{ PPP_MPLS_MCAST, "MPLS" },
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{ PPP_COMP, "Compressed"},
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{ PPP_ML, "MLPPP"},
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{ PPP_IPV6, "IP6"},
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{ PPP_HELLO, "HELLO" },
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{ PPP_LUXCOM, "LUXCOM" },
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{ PPP_SNS, "SNS" },
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{ PPP_IPCP, "IPCP" },
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{ PPP_OSICP, "OSICP" },
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{ PPP_NSCP, "NSCP" },
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{ PPP_DECNETCP, "DECNETCP" },
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{ PPP_APPLECP, "APPLECP" },
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{ PPP_IPXCP, "IPXCP" },
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{ PPP_STIICP, "STIICP" },
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{ PPP_VINESCP, "VINESCP" },
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{ PPP_IPV6CP, "IP6CP" },
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{ PPP_MPLSCP, "MPLSCP" },
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{ PPP_LCP, "LCP" },
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{ PPP_PAP, "PAP" },
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{ PPP_LQM, "LQM" },
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{ PPP_CHAP, "CHAP" },
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{ PPP_EAP, "EAP" },
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{ PPP_SPAP, "SPAP" },
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{ PPP_SPAP_OLD, "Old-SPAP" },
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{ PPP_BACP, "BACP" },
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{ PPP_BAP, "BAP" },
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{ PPP_MPCP, "MLPPP-CP" },
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{ 0, NULL }
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};
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/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
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#define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
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#define CPCODES_CONF_REQ 1 /* Configure-Request */
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#define CPCODES_CONF_ACK 2 /* Configure-Ack */
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#define CPCODES_CONF_NAK 3 /* Configure-Nak */
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#define CPCODES_CONF_REJ 4 /* Configure-Reject */
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#define CPCODES_TERM_REQ 5 /* Terminate-Request */
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#define CPCODES_TERM_ACK 6 /* Terminate-Ack */
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#define CPCODES_CODE_REJ 7 /* Code-Reject */
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#define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
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#define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
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#define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
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#define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
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#define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
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#define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
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#define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
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#define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
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struct tok cpcodes[] = {
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{CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
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{CPCODES_CONF_REQ, "Conf-Request"},
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{CPCODES_CONF_ACK, "Conf-Ack"},
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{CPCODES_CONF_NAK, "Conf-Nack"},
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{CPCODES_CONF_REJ, "Conf-Reject"},
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{CPCODES_TERM_REQ, "Term-Request"},
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{CPCODES_TERM_ACK, "Term-Ack"},
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{CPCODES_CODE_REJ, "Code-Reject"},
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{CPCODES_PROT_REJ, "Prot-Reject"},
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{CPCODES_ECHO_REQ, "Echo-Request"},
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{CPCODES_ECHO_RPL, "Echo-Reply"},
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{CPCODES_DISC_REQ, "Disc-Req"},
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{CPCODES_ID, "Ident"}, /* RFC1570 */
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{CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
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{CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
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{CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
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{0, NULL}
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};
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/* LCP Config Options */
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#define LCPOPT_VEXT 0
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#define LCPOPT_MRU 1
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#define LCPOPT_ACCM 2
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#define LCPOPT_AP 3
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#define LCPOPT_QP 4
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#define LCPOPT_MN 5
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#define LCPOPT_DEP6 6
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#define LCPOPT_PFC 7
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#define LCPOPT_ACFC 8
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#define LCPOPT_FCSALT 9
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#define LCPOPT_SDP 10
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#define LCPOPT_NUMMODE 11
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#define LCPOPT_DEP12 12
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#define LCPOPT_CBACK 13
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#define LCPOPT_DEP14 14
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#define LCPOPT_DEP15 15
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#define LCPOPT_DEP16 16
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#define LCPOPT_MLMRRU 17
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#define LCPOPT_MLSSNHF 18
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#define LCPOPT_MLED 19
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#define LCPOPT_PROP 20
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#define LCPOPT_DCEID 21
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#define LCPOPT_MPP 22
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#define LCPOPT_LD 23
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#define LCPOPT_LCPAOPT 24
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#define LCPOPT_COBS 25
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#define LCPOPT_PE 26
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#define LCPOPT_MLHF 27
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#define LCPOPT_I18N 28
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#define LCPOPT_SDLOS 29
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#define LCPOPT_PPPMUX 30
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#define LCPOPT_MIN LCPOPT_VEXT
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#define LCPOPT_MAX LCPOPT_PPPMUX
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static const char *lcpconfopts[] = {
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"Vend-Ext", /* (0) */
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"MRU", /* (1) */
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"ACCM", /* (2) */
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"Auth-Prot", /* (3) */
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"Qual-Prot", /* (4) */
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"Magic-Num", /* (5) */
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"deprecated(6)", /* used to be a Quality Protocol */
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"PFC", /* (7) */
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"ACFC", /* (8) */
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"FCS-Alt", /* (9) */
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"SDP", /* (10) */
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"Num-Mode", /* (11) */
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"deprecated(12)", /* used to be a Multi-Link-Procedure*/
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"Call-Back", /* (13) */
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"deprecated(14)", /* used to be a Connect-Time */
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"deprecated(15)", /* used to be a Compund-Frames */
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"deprecated(16)", /* used to be a Nominal-Data-Encap */
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"MRRU", /* (17) */
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"12-Bit seq #", /* (18) */
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"End-Disc", /* (19) */
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"Proprietary", /* (20) */
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"DCE-Id", /* (21) */
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"MP+", /* (22) */
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"Link-Disc", /* (23) */
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"LCP-Auth-Opt", /* (24) */
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"COBS", /* (25) */
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"Prefix-elision", /* (26) */
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"Multilink-header-Form",/* (27) */
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"I18N", /* (28) */
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"SDL-over-SONET/SDH", /* (29) */
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"PPP-Muxing", /* (30) */
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};
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/* ECP - to be supported */
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/* CCP Config Options */
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#define CCPOPT_OUI 0 /* RFC1962 */
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#define CCPOPT_PRED1 1 /* RFC1962 */
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#define CCPOPT_PRED2 2 /* RFC1962 */
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#define CCPOPT_PJUMP 3 /* RFC1962 */
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/* 4-15 unassigned */
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#define CCPOPT_HPPPC 16 /* RFC1962 */
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#define CCPOPT_STACLZS 17 /* RFC1974 */
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#define CCPOPT_MPPC 18 /* RFC2118 */
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#define CCPOPT_GFZA 19 /* RFC1962 */
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#define CCPOPT_V42BIS 20 /* RFC1962 */
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#define CCPOPT_BSDCOMP 21 /* RFC1977 */
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/* 22 unassigned */
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#define CCPOPT_LZSDCP 23 /* RFC1967 */
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#define CCPOPT_MVRCA 24 /* RFC1975 */
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#define CCPOPT_DEC 25 /* RFC1976 */
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#define CCPOPT_DEFLATE 26 /* RFC1979 */
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/* 27-254 unassigned */
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#define CCPOPT_RESV 255 /* RFC1962 */
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const struct tok ccpconfopts_values[] = {
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{ CCPOPT_OUI, "OUI" },
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{ CCPOPT_PRED1, "Pred-1" },
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{ CCPOPT_PRED2, "Pred-2" },
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{ CCPOPT_PJUMP, "Puddle" },
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{ CCPOPT_HPPPC, "HP-PPC" },
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{ CCPOPT_STACLZS, "Stac-LZS" },
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{ CCPOPT_MPPC, "MPPC" },
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{ CCPOPT_GFZA, "Gand-FZA" },
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{ CCPOPT_V42BIS, "V.42bis" },
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{ CCPOPT_BSDCOMP, "BSD-Comp" },
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{ CCPOPT_LZSDCP, "LZS-DCP" },
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{ CCPOPT_MVRCA, "MVRCA" },
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{ CCPOPT_DEC, "DEC" },
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{ CCPOPT_DEFLATE, "Deflate" },
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{ CCPOPT_RESV, "Reserved"},
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{0, NULL}
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};
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/* BACP Config Options */
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#define BACPOPT_FPEER 1 /* RFC2125 */
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const struct tok bacconfopts_values[] = {
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{ BACPOPT_FPEER, "Favored-Peer" },
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{0, NULL}
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};
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/* SDCP - to be supported */
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/* IPCP Config Options */
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#define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
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#define IPCPOPT_IPCOMP 2 /* RFC1332 */
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#define IPCPOPT_ADDR 3 /* RFC1332 */
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#define IPCPOPT_MOBILE4 4 /* RFC2290 */
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#define IPCPOPT_PRIDNS 129 /* RFC1877 */
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#define IPCPOPT_PRINBNS 130 /* RFC1877 */
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#define IPCPOPT_SECDNS 131 /* RFC1877 */
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#define IPCPOPT_SECNBNS 132 /* RFC1877 */
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struct tok ipcpopt_values[] = {
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{ IPCPOPT_2ADDR, "IP-Addrs" },
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{ IPCPOPT_IPCOMP, "IP-Comp" },
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{ IPCPOPT_ADDR, "IP-Addr" },
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{ IPCPOPT_MOBILE4, "Home-Addr" },
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{ IPCPOPT_PRIDNS, "Pri-DNS" },
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{ IPCPOPT_PRINBNS, "Pri-NBNS" },
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{ IPCPOPT_SECDNS, "Sec-DNS" },
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{ IPCPOPT_SECNBNS, "Sec-NBNS" },
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{ 0, NULL }
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};
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#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
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#define IPCPOPT_IPCOMP_MINLEN 14
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struct tok ipcpopt_compproto_values[] = {
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{ PPP_VJC, "VJ-Comp" },
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{ IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
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{ 0, NULL }
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};
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struct tok ipcpopt_compproto_subopt_values[] = {
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{ 1, "RTP-Compression" },
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{ 2, "Enhanced RTP-Compression" },
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{ 0, NULL }
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};
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/* IP6CP Config Options */
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#define IP6CP_IFID 1
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struct tok ip6cpopt_values[] = {
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{ IP6CP_IFID, "Interface-ID" },
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{ 0, NULL }
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};
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/* ATCP - to be supported */
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/* OSINLCP - to be supported */
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/* BVCP - to be supported */
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/* BCP - to be supported */
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/* IPXCP - to be supported */
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/* MPLSCP - to be supported */
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/* Auth Algorithms */
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/* 0-4 Reserved (RFC1994) */
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#define AUTHALG_CHAPMD5 5 /* RFC1994 */
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#define AUTHALG_MSCHAP1 128 /* RFC2433 */
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#define AUTHALG_MSCHAP2 129 /* RFC2795 */
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struct tok authalg_values[] = {
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{ AUTHALG_CHAPMD5, "MD5" },
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{ AUTHALG_MSCHAP1, "MS-CHAPv1" },
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{ AUTHALG_MSCHAP2, "MS-CHAPv2" },
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{ 0, NULL }
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};
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/* FCS Alternatives - to be supported */
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/* Multilink Endpoint Discriminator (RFC1717) */
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#define MEDCLASS_NULL 0 /* Null Class */
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#define MEDCLASS_LOCAL 1 /* Locally Assigned */
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#define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
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#define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
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#define MEDCLASS_MNB 4 /* PPP Magic Number Block */
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#define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
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/* PPP LCP Callback */
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#define CALLBACK_AUTH 0 /* Location determined by user auth */
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#define CALLBACK_DSTR 1 /* Dialing string */
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#define CALLBACK_LID 2 /* Location identifier */
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#define CALLBACK_E164 3 /* E.164 number */
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#define CALLBACK_X500 4 /* X.500 distinguished name */
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#define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
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struct tok ppp_callback_values[] = {
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{ CALLBACK_AUTH, "UserAuth" },
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{ CALLBACK_DSTR, "DialString" },
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{ CALLBACK_LID, "LocalID" },
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{ CALLBACK_E164, "E.164" },
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{ CALLBACK_X500, "X.500" },
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{ CALLBACK_CBCP, "CBCP" },
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{ 0, NULL }
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};
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/* CHAP */
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#define CHAP_CHAL 1
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#define CHAP_RESP 2
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#define CHAP_SUCC 3
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#define CHAP_FAIL 4
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struct tok chapcode_values[] = {
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{ CHAP_CHAL, "Challenge" },
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{ CHAP_RESP, "Response" },
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{ CHAP_SUCC, "Success" },
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{ CHAP_FAIL, "Fail" },
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{ 0, NULL}
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};
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/* PAP */
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#define PAP_AREQ 1
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#define PAP_AACK 2
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#define PAP_ANAK 3
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struct tok papcode_values[] = {
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{ PAP_AREQ, "Auth-Req" },
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{ PAP_AACK, "Auth-ACK" },
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{ PAP_ANAK, "Auth-NACK" },
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{ 0, NULL }
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};
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/* BAP */
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#define BAP_CALLREQ 1
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#define BAP_CALLRES 2
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#define BAP_CBREQ 3
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#define BAP_CBRES 4
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#define BAP_LDQREQ 5
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#define BAP_LDQRES 6
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#define BAP_CSIND 7
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#define BAP_CSRES 8
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static void handle_ctrl_proto (u_int proto,const u_char *p, int length);
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static void handle_chap (const u_char *p, int length);
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static void handle_pap (const u_char *p, int length);
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static void handle_bap (const u_char *p, int length);
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static void handle_mlppp(const u_char *p, int length);
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static int print_lcp_config_options (const u_char *p, int);
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static int print_ipcp_config_options (const u_char *p, int);
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static int print_ip6cp_config_options (const u_char *p, int);
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static int print_ccp_config_options (const u_char *p, int);
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static int print_bacp_config_options (const u_char *p, int);
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static void handle_ppp (u_int proto, const u_char *p, int length);
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static void ppp_hdlc(const u_char *p, int length);
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|
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/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
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static void
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handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
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{
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const char *typestr;
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u_int code, len;
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int (*pfunc)(const u_char *, int);
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int x, j;
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const u_char *tptr;
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tptr=pptr;
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typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
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printf("%s, ",typestr);
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if (length < 4) /* FIXME weak boundary checking */
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goto trunc;
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TCHECK2(*tptr, 2);
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code = *tptr++;
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printf("%s (0x%02x), id %u, length %u",
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tok2str(cpcodes, "Unknown Opcode",code),
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code,
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*tptr++, /* ID */
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|
length+2);
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if (!vflag)
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return;
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if (length <= 4)
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|
return; /* there may be a NULL confreq etc. */
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|
|
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TCHECK2(*tptr, 2);
|
|
len = EXTRACT_16BITS(tptr);
|
|
tptr += 2;
|
|
|
|
printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4);
|
|
|
|
if (vflag>1)
|
|
print_unknown_data(pptr-2,"\n\t",6);
|
|
|
|
|
|
switch (code) {
|
|
case CPCODES_VEXT:
|
|
if (length < 11)
|
|
break;
|
|
TCHECK2(*tptr, 4);
|
|
printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
|
|
tptr += 4;
|
|
TCHECK2(*tptr, 3);
|
|
printf(" Vendor: %s (%u)",
|
|
tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
|
|
EXTRACT_24BITS(tptr));
|
|
/* XXX: need to decode Kind and Value(s)? */
|
|
break;
|
|
case CPCODES_CONF_REQ:
|
|
case CPCODES_CONF_ACK:
|
|
case CPCODES_CONF_NAK:
|
|
case CPCODES_CONF_REJ:
|
|
x = len - 4; /* Code(1), Identifier(1) and Length(2) */
|
|
do {
|
|
switch (proto) {
|
|
case PPP_LCP:
|
|
pfunc = print_lcp_config_options;
|
|
break;
|
|
case PPP_IPCP:
|
|
pfunc = print_ipcp_config_options;
|
|
break;
|
|
case PPP_IPV6CP:
|
|
pfunc = print_ip6cp_config_options;
|
|
break;
|
|
case PPP_CCP:
|
|
pfunc = print_ccp_config_options;
|
|
break;
|
|
case PPP_BACP:
|
|
pfunc = print_bacp_config_options;
|
|
break;
|
|
default:
|
|
/*
|
|
* No print routine for the options for
|
|
* this protocol.
|
|
*/
|
|
pfunc = NULL;
|
|
break;
|
|
}
|
|
|
|
if (pfunc == NULL) /* catch the above null pointer if unknown CP */
|
|
break;
|
|
|
|
if ((j = (*pfunc)(tptr, len)) == 0)
|
|
break;
|
|
x -= j;
|
|
tptr += j;
|
|
} while (x > 0);
|
|
break;
|
|
|
|
case CPCODES_TERM_REQ:
|
|
case CPCODES_TERM_ACK:
|
|
/* XXX: need to decode Data? */
|
|
break;
|
|
case CPCODES_CODE_REJ:
|
|
/* XXX: need to decode Rejected-Packet? */
|
|
break;
|
|
case CPCODES_PROT_REJ:
|
|
if (length < 6)
|
|
break;
|
|
TCHECK2(*tptr, 2);
|
|
printf("\n\t Rejected %s Protocol (0x%04x)",
|
|
tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
|
|
EXTRACT_16BITS(tptr));
|
|
/* XXX: need to decode Rejected-Information? - hexdump for now */
|
|
if (len > 6) {
|
|
printf("\n\t Rejected Packet");
|
|
print_unknown_data(tptr+2,"\n\t ",len-2);
|
|
}
|
|
break;
|
|
case CPCODES_ECHO_REQ:
|
|
case CPCODES_ECHO_RPL:
|
|
case CPCODES_DISC_REQ:
|
|
if (length < 8)
|
|
break;
|
|
TCHECK2(*tptr, 4);
|
|
printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
|
|
/* XXX: need to decode Data? - hexdump for now */
|
|
if (len > 8) {
|
|
printf("\n\t -----trailing data-----");
|
|
TCHECK2(tptr[4], len-8);
|
|
print_unknown_data(tptr+4,"\n\t ",len-8);
|
|
}
|
|
break;
|
|
case CPCODES_ID:
|
|
if (length < 8)
|
|
break;
|
|
TCHECK2(*tptr, 4);
|
|
printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
|
|
/* RFC 1661 says this is intended to be human readable */
|
|
if (len > 8) {
|
|
printf("\n\t Message\n\t ");
|
|
fn_printn(tptr+4,len-4,snapend);
|
|
}
|
|
break;
|
|
case CPCODES_TIME_REM:
|
|
if (length < 12)
|
|
break;
|
|
TCHECK2(*tptr, 4);
|
|
printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
|
|
TCHECK2(*(tptr + 4), 4);
|
|
printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
|
|
/* XXX: need to decode Message? */
|
|
break;
|
|
default:
|
|
/* XXX this is dirty but we do not get the
|
|
* original pointer passed to the begin
|
|
* the PPP packet */
|
|
if (vflag <= 1)
|
|
print_unknown_data(pptr-2,"\n\t ",length+2);
|
|
break;
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
printf("[|%s]", typestr);
|
|
}
|
|
|
|
/* LCP config options */
|
|
static int
|
|
print_lcp_config_options(const u_char *p, int length)
|
|
{
|
|
int len, opt;
|
|
|
|
if (length < 2)
|
|
return 0;
|
|
TCHECK2(*p, 2);
|
|
len = p[1];
|
|
opt = p[0];
|
|
if (length < len)
|
|
return 0;
|
|
if (len < 2) {
|
|
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
|
|
printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len);
|
|
else
|
|
printf("\n\tunknown LCP option 0x%02x", opt);
|
|
return 0;
|
|
}
|
|
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
|
|
printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len);
|
|
else {
|
|
printf("\n\tunknown LCP option 0x%02x", opt);
|
|
return len;
|
|
}
|
|
|
|
switch (opt) {
|
|
case LCPOPT_VEXT:
|
|
if (len >= 6) {
|
|
TCHECK2(*(p + 2), 3);
|
|
printf("Vendor: %s (%u)",
|
|
tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
|
|
EXTRACT_24BITS(p+2));
|
|
#if 0
|
|
TCHECK(p[5]);
|
|
printf(", kind: 0x%02x", p[5]);
|
|
printf(", Value: 0x")
|
|
for (i = 0; i < len - 6; i++) {
|
|
TCHECK(p[6 + i]);
|
|
printf("%02x", p[6 + i]);
|
|
}
|
|
#endif
|
|
}
|
|
break;
|
|
case LCPOPT_MRU:
|
|
if (len == 4) {
|
|
TCHECK2(*(p + 2), 2);
|
|
printf("%u", EXTRACT_16BITS(p + 2));
|
|
}
|
|
break;
|
|
case LCPOPT_ACCM:
|
|
if (len == 6) {
|
|
TCHECK2(*(p + 2), 4);
|
|
printf("0x%08x", EXTRACT_32BITS(p + 2));
|
|
}
|
|
break;
|
|
case LCPOPT_AP:
|
|
if (len >= 4) {
|
|
TCHECK2(*(p + 2), 2);
|
|
printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2)));
|
|
|
|
switch (EXTRACT_16BITS(p+2)) {
|
|
case PPP_CHAP:
|
|
TCHECK(p[4]);
|
|
printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4]));
|
|
break;
|
|
case PPP_PAP: /* fall through */
|
|
case PPP_EAP:
|
|
case PPP_SPAP:
|
|
case PPP_SPAP_OLD:
|
|
break;
|
|
default:
|
|
print_unknown_data(p,"\n\t",len);
|
|
}
|
|
}
|
|
break;
|
|
case LCPOPT_QP:
|
|
if (len >= 4) {
|
|
TCHECK2(*(p + 2), 2);
|
|
if (EXTRACT_16BITS(p+2) == PPP_LQM)
|
|
printf(" LQR");
|
|
else
|
|
printf(" unknown");
|
|
}
|
|
break;
|
|
case LCPOPT_MN:
|
|
if (len == 6) {
|
|
TCHECK2(*(p + 2), 4);
|
|
printf("0x%08x", EXTRACT_32BITS(p + 2));
|
|
}
|
|
break;
|
|
case LCPOPT_PFC:
|
|
break;
|
|
case LCPOPT_ACFC:
|
|
break;
|
|
case LCPOPT_LD:
|
|
if (len == 4) {
|
|
TCHECK2(*(p + 2), 2);
|
|
printf("0x%04x", EXTRACT_16BITS(p + 2));
|
|
}
|
|
break;
|
|
case LCPOPT_CBACK:
|
|
if (len < 3)
|
|
break;
|
|
TCHECK(p[2]);
|
|
printf("Callback Operation %s (%u)",
|
|
tok2str(ppp_callback_values,"Unknown",p[2]),
|
|
p[2]);
|
|
break;
|
|
case LCPOPT_MLMRRU:
|
|
if (len == 4) {
|
|
TCHECK2(*(p + 2), 2);
|
|
printf("%u", EXTRACT_16BITS(p + 2));
|
|
}
|
|
break;
|
|
case LCPOPT_MLED:
|
|
if (len < 3)
|
|
break;
|
|
TCHECK(p[2]);
|
|
switch (p[2]) { /* class */
|
|
case MEDCLASS_NULL:
|
|
printf("Null");
|
|
break;
|
|
case MEDCLASS_LOCAL:
|
|
printf("Local"); /* XXX */
|
|
break;
|
|
case MEDCLASS_IPV4:
|
|
if (len != 7)
|
|
break;
|
|
TCHECK2(*(p + 3), 4);
|
|
printf("IPv4 %s", ipaddr_string(p + 3));
|
|
break;
|
|
case MEDCLASS_MAC:
|
|
if (len != 9)
|
|
break;
|
|
TCHECK(p[8]);
|
|
printf("MAC %02x:%02x:%02x:%02x:%02x:%02x",
|
|
p[3], p[4], p[5], p[6], p[7], p[8]);
|
|
break;
|
|
case MEDCLASS_MNB:
|
|
printf("Magic-Num-Block"); /* XXX */
|
|
break;
|
|
case MEDCLASS_PSNDN:
|
|
printf("PSNDN"); /* XXX */
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* XXX: to be supported */
|
|
#if 0
|
|
case LCPOPT_DEP6:
|
|
case LCPOPT_FCSALT:
|
|
case LCPOPT_SDP:
|
|
case LCPOPT_NUMMODE:
|
|
case LCPOPT_DEP12:
|
|
case LCPOPT_DEP14:
|
|
case LCPOPT_DEP15:
|
|
case LCPOPT_DEP16:
|
|
case LCPOPT_MLSSNHF:
|
|
case LCPOPT_PROP:
|
|
case LCPOPT_DCEID:
|
|
case LCPOPT_MPP:
|
|
case LCPOPT_LCPAOPT:
|
|
case LCPOPT_COBS:
|
|
case LCPOPT_PE:
|
|
case LCPOPT_MLHF:
|
|
case LCPOPT_I18N:
|
|
case LCPOPT_SDLOS:
|
|
case LCPOPT_PPPMUX:
|
|
break;
|
|
#endif
|
|
default:
|
|
if(vflag<2)
|
|
print_unknown_data(&p[2],"\n\t ",len-2);
|
|
break;
|
|
}
|
|
|
|
if (vflag>1)
|
|
print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
|
|
|
|
return len;
|
|
|
|
trunc:
|
|
printf("[|lcp]");
|
|
return 0;
|
|
}
|
|
|
|
/* ML-PPP*/
|
|
struct tok ppp_ml_flag_values[] = {
|
|
{ 0x80, "begin" },
|
|
{ 0x40, "end" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
handle_mlppp(const u_char *p, int length) {
|
|
|
|
if (!eflag)
|
|
printf("MLPPP, ");
|
|
|
|
printf("seq 0x%03x, Flags [%s], length %u",
|
|
(EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */
|
|
bittok2str(ppp_ml_flag_values, "none", *p & 0xc0),
|
|
length);
|
|
|
|
return;
|
|
}
|
|
|
|
/* CHAP */
|
|
static void
|
|
handle_chap(const u_char *p, int length)
|
|
{
|
|
u_int code, len;
|
|
int val_size, name_size, msg_size;
|
|
const u_char *p0;
|
|
int i;
|
|
|
|
p0 = p;
|
|
if (length < 1) {
|
|
printf("[|chap]");
|
|
return;
|
|
} else if (length < 4) {
|
|
TCHECK(*p);
|
|
printf("[|chap 0x%02x]", *p);
|
|
return;
|
|
}
|
|
|
|
TCHECK(*p);
|
|
code = *p;
|
|
printf("CHAP, %s (0x%02x)",
|
|
tok2str(chapcode_values,"unknown",code),
|
|
code);
|
|
p++;
|
|
|
|
TCHECK(*p);
|
|
printf(", id %u", *p); /* ID */
|
|
p++;
|
|
|
|
TCHECK2(*p, 2);
|
|
len = EXTRACT_16BITS(p);
|
|
p += 2;
|
|
|
|
/*
|
|
* Note that this is a generic CHAP decoding routine. Since we
|
|
* don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
|
|
* MS-CHAPv2) is used at this point, we can't decode packet
|
|
* specifically to each algorithms. Instead, we simply decode
|
|
* the GCD (Gratest Common Denominator) for all algorithms.
|
|
*/
|
|
switch (code) {
|
|
case CHAP_CHAL:
|
|
case CHAP_RESP:
|
|
if (length - (p - p0) < 1)
|
|
return;
|
|
TCHECK(*p);
|
|
val_size = *p; /* value size */
|
|
p++;
|
|
if (length - (p - p0) < val_size)
|
|
return;
|
|
printf(", Value ");
|
|
for (i = 0; i < val_size; i++) {
|
|
TCHECK(*p);
|
|
printf("%02x", *p++);
|
|
}
|
|
name_size = len - (p - p0);
|
|
printf(", Name ");
|
|
for (i = 0; i < name_size; i++) {
|
|
TCHECK(*p);
|
|
safeputchar(*p++);
|
|
}
|
|
break;
|
|
case CHAP_SUCC:
|
|
case CHAP_FAIL:
|
|
msg_size = len - (p - p0);
|
|
printf(", Msg ");
|
|
for (i = 0; i< msg_size; i++) {
|
|
TCHECK(*p);
|
|
safeputchar(*p++);
|
|
}
|
|
break;
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
printf("[|chap]");
|
|
}
|
|
|
|
/* PAP (see RFC 1334) */
|
|
static void
|
|
handle_pap(const u_char *p, int length)
|
|
{
|
|
u_int code, len;
|
|
int peerid_len, passwd_len, msg_len;
|
|
const u_char *p0;
|
|
int i;
|
|
|
|
p0 = p;
|
|
if (length < 1) {
|
|
printf("[|pap]");
|
|
return;
|
|
} else if (length < 4) {
|
|
TCHECK(*p);
|
|
printf("[|pap 0x%02x]", *p);
|
|
return;
|
|
}
|
|
|
|
TCHECK(*p);
|
|
code = *p;
|
|
printf("PAP, %s (0x%02x)",
|
|
tok2str(papcode_values,"unknown",code),
|
|
code);
|
|
p++;
|
|
|
|
TCHECK(*p);
|
|
printf(", id %u", *p); /* ID */
|
|
p++;
|
|
|
|
TCHECK2(*p, 2);
|
|
len = EXTRACT_16BITS(p);
|
|
p += 2;
|
|
|
|
if ((int)len > length) {
|
|
printf(", length %u > packet size", len);
|
|
return;
|
|
}
|
|
length = len;
|
|
if (length < (p - p0)) {
|
|
printf(", length %u < PAP header length", length);
|
|
return;
|
|
}
|
|
|
|
switch (code) {
|
|
case PAP_AREQ:
|
|
if (length - (p - p0) < 1)
|
|
return;
|
|
TCHECK(*p);
|
|
peerid_len = *p; /* Peer-ID Length */
|
|
p++;
|
|
if (length - (p - p0) < peerid_len)
|
|
return;
|
|
printf(", Peer ");
|
|
for (i = 0; i < peerid_len; i++) {
|
|
TCHECK(*p);
|
|
safeputchar(*p++);
|
|
}
|
|
|
|
if (length - (p - p0) < 1)
|
|
return;
|
|
TCHECK(*p);
|
|
passwd_len = *p; /* Password Length */
|
|
p++;
|
|
if (length - (p - p0) < passwd_len)
|
|
return;
|
|
printf(", Name ");
|
|
for (i = 0; i < passwd_len; i++) {
|
|
TCHECK(*p);
|
|
safeputchar(*p++);
|
|
}
|
|
break;
|
|
case PAP_AACK:
|
|
case PAP_ANAK:
|
|
if (length - (p - p0) < 1)
|
|
return;
|
|
TCHECK(*p);
|
|
msg_len = *p; /* Msg-Length */
|
|
p++;
|
|
if (length - (p - p0) < msg_len)
|
|
return;
|
|
printf(", Msg ");
|
|
for (i = 0; i< msg_len; i++) {
|
|
TCHECK(*p);
|
|
safeputchar(*p++);
|
|
}
|
|
break;
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
printf("[|pap]");
|
|
}
|
|
|
|
/* BAP */
|
|
static void
|
|
handle_bap(const u_char *p _U_, int length _U_)
|
|
{
|
|
/* XXX: to be supported!! */
|
|
}
|
|
|
|
|
|
/* IPCP config options */
|
|
static int
|
|
print_ipcp_config_options(const u_char *p, int length)
|
|
{
|
|
int len, opt;
|
|
u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
|
|
|
|
if (length < 2)
|
|
return 0;
|
|
TCHECK2(*p, 2);
|
|
len = p[1];
|
|
opt = p[0];
|
|
if (length < len)
|
|
return 0;
|
|
if (len < 2) {
|
|
printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
|
|
tok2str(ipcpopt_values,"unknown",opt),
|
|
opt,
|
|
len);
|
|
return 0;
|
|
}
|
|
|
|
printf("\n\t %s Option (0x%02x), length %u: ",
|
|
tok2str(ipcpopt_values,"unknown",opt),
|
|
opt,
|
|
len);
|
|
|
|
switch (opt) {
|
|
case IPCPOPT_2ADDR: /* deprecated */
|
|
if (len != 10)
|
|
goto invlen;
|
|
TCHECK2(*(p + 6), 4);
|
|
printf("src %s, dst %s",
|
|
ipaddr_string(p + 2),
|
|
ipaddr_string(p + 6));
|
|
break;
|
|
case IPCPOPT_IPCOMP:
|
|
if (len < 4)
|
|
goto invlen;
|
|
TCHECK2(*(p + 2), 2);
|
|
compproto = EXTRACT_16BITS(p+2);
|
|
|
|
printf("%s (0x%02x):",
|
|
tok2str(ipcpopt_compproto_values,"Unknown",compproto),
|
|
compproto);
|
|
|
|
switch (compproto) {
|
|
case PPP_VJC:
|
|
/* XXX: VJ-Comp parameters should be decoded */
|
|
break;
|
|
case IPCPOPT_IPCOMP_HDRCOMP:
|
|
if (len < IPCPOPT_IPCOMP_MINLEN)
|
|
goto invlen;
|
|
|
|
TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN);
|
|
printf("\n\t TCP Space %u, non-TCP Space %u" \
|
|
", maxPeriod %u, maxTime %u, maxHdr %u",
|
|
EXTRACT_16BITS(p+4),
|
|
EXTRACT_16BITS(p+6),
|
|
EXTRACT_16BITS(p+8),
|
|
EXTRACT_16BITS(p+10),
|
|
EXTRACT_16BITS(p+12));
|
|
|
|
/* suboptions present ? */
|
|
if (len > IPCPOPT_IPCOMP_MINLEN) {
|
|
ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
|
|
p += IPCPOPT_IPCOMP_MINLEN;
|
|
|
|
printf("\n\t Suboptions, length %u", ipcomp_subopttotallen);
|
|
|
|
while (ipcomp_subopttotallen >= 2) {
|
|
TCHECK2(*p, 2);
|
|
ipcomp_subopt = *p;
|
|
ipcomp_suboptlen = *(p+1);
|
|
|
|
/* sanity check */
|
|
if (ipcomp_subopt == 0 ||
|
|
ipcomp_suboptlen == 0 )
|
|
break;
|
|
|
|
/* XXX: just display the suboptions for now */
|
|
printf("\n\t\t%s Suboption #%u, length %u",
|
|
tok2str(ipcpopt_compproto_subopt_values,
|
|
"Unknown",
|
|
ipcomp_subopt),
|
|
ipcomp_subopt,
|
|
ipcomp_suboptlen);
|
|
|
|
ipcomp_subopttotallen -= ipcomp_suboptlen;
|
|
p += ipcomp_suboptlen;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case IPCPOPT_ADDR: /* those options share the same format - fall through */
|
|
case IPCPOPT_MOBILE4:
|
|
case IPCPOPT_PRIDNS:
|
|
case IPCPOPT_PRINBNS:
|
|
case IPCPOPT_SECDNS:
|
|
case IPCPOPT_SECNBNS:
|
|
if (len != 6)
|
|
goto invlen;
|
|
TCHECK2(*(p + 2), 4);
|
|
printf("%s", ipaddr_string(p + 2));
|
|
break;
|
|
default:
|
|
if(vflag<2)
|
|
print_unknown_data(&p[2],"\n\t ",len-2);
|
|
break;
|
|
}
|
|
if (vflag>1)
|
|
print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
|
|
return len;
|
|
|
|
invlen:
|
|
printf(", invalid-length-%d", opt);
|
|
return 0;
|
|
|
|
trunc:
|
|
printf("[|ipcp]");
|
|
return 0;
|
|
}
|
|
|
|
/* IP6CP config options */
|
|
static int
|
|
print_ip6cp_config_options(const u_char *p, int length)
|
|
{
|
|
int len, opt;
|
|
|
|
if (length < 2)
|
|
return 0;
|
|
TCHECK2(*p, 2);
|
|
len = p[1];
|
|
opt = p[0];
|
|
if (length < len)
|
|
return 0;
|
|
if (len < 2) {
|
|
printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
|
|
tok2str(ip6cpopt_values,"unknown",opt),
|
|
opt,
|
|
len);
|
|
return 0;
|
|
}
|
|
|
|
printf("\n\t %s Option (0x%02x), length %u: ",
|
|
tok2str(ip6cpopt_values,"unknown",opt),
|
|
opt,
|
|
len);
|
|
|
|
switch (opt) {
|
|
case IP6CP_IFID:
|
|
if (len != 10)
|
|
goto invlen;
|
|
TCHECK2(*(p + 2), 8);
|
|
printf("%04x:%04x:%04x:%04x",
|
|
EXTRACT_16BITS(p + 2),
|
|
EXTRACT_16BITS(p + 4),
|
|
EXTRACT_16BITS(p + 6),
|
|
EXTRACT_16BITS(p + 8));
|
|
break;
|
|
default:
|
|
if(vflag<2)
|
|
print_unknown_data(&p[2],"\n\t ",len-2);
|
|
break;
|
|
}
|
|
if (vflag>1)
|
|
print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
|
|
|
|
return len;
|
|
|
|
invlen:
|
|
printf(", invalid-length-%d", opt);
|
|
return 0;
|
|
|
|
trunc:
|
|
printf("[|ip6cp]");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* CCP config options */
|
|
static int
|
|
print_ccp_config_options(const u_char *p, int length)
|
|
{
|
|
int len, opt;
|
|
|
|
if (length < 2)
|
|
return 0;
|
|
TCHECK2(*p, 2);
|
|
len = p[1];
|
|
opt = p[0];
|
|
if (length < len)
|
|
return 0;
|
|
if (len < 2) {
|
|
printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
|
|
tok2str(ccpconfopts_values, "Unknown", opt),
|
|
opt,
|
|
len);
|
|
return 0;
|
|
}
|
|
|
|
printf("\n\t %s Option (0x%02x), length %u:",
|
|
tok2str(ccpconfopts_values, "Unknown", opt),
|
|
opt,
|
|
len);
|
|
|
|
switch (opt) {
|
|
/* fall through --> default: nothing supported yet */
|
|
case CCPOPT_OUI:
|
|
case CCPOPT_PRED1:
|
|
case CCPOPT_PRED2:
|
|
case CCPOPT_PJUMP:
|
|
case CCPOPT_HPPPC:
|
|
case CCPOPT_STACLZS:
|
|
case CCPOPT_MPPC:
|
|
case CCPOPT_GFZA:
|
|
case CCPOPT_V42BIS:
|
|
case CCPOPT_BSDCOMP:
|
|
case CCPOPT_LZSDCP:
|
|
case CCPOPT_MVRCA:
|
|
case CCPOPT_DEC:
|
|
case CCPOPT_DEFLATE:
|
|
case CCPOPT_RESV:
|
|
default:
|
|
if(vflag<2)
|
|
print_unknown_data(&p[2],"\n\t ",len-2);
|
|
break;
|
|
}
|
|
if (vflag>1)
|
|
print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
|
|
|
|
return len;
|
|
|
|
trunc:
|
|
printf("[|ccp]");
|
|
return 0;
|
|
}
|
|
|
|
/* BACP config options */
|
|
static int
|
|
print_bacp_config_options(const u_char *p, int length)
|
|
{
|
|
int len, opt;
|
|
|
|
if (length < 2)
|
|
return 0;
|
|
TCHECK2(*p, 2);
|
|
len = p[1];
|
|
opt = p[0];
|
|
if (length < len)
|
|
return 0;
|
|
if (len < 2) {
|
|
printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
|
|
tok2str(bacconfopts_values, "Unknown", opt),
|
|
opt,
|
|
len);
|
|
return 0;
|
|
}
|
|
|
|
printf("\n\t %s Option (0x%02x), length %u:",
|
|
tok2str(bacconfopts_values, "Unknown", opt),
|
|
opt,
|
|
len);
|
|
|
|
switch (opt) {
|
|
case BACPOPT_FPEER:
|
|
TCHECK2(*(p + 2), 4);
|
|
printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
|
|
break;
|
|
default:
|
|
if(vflag<2)
|
|
print_unknown_data(&p[2],"\n\t ",len-2);
|
|
break;
|
|
}
|
|
if (vflag>1)
|
|
print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
|
|
|
|
return len;
|
|
|
|
trunc:
|
|
printf("[|bacp]");
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
ppp_hdlc(const u_char *p, int length)
|
|
{
|
|
u_char *b, *s, *t, c;
|
|
int i, proto;
|
|
const void *se;
|
|
|
|
b = (u_int8_t *)malloc(length);
|
|
if (b == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Unescape all the data into a temporary, private, buffer.
|
|
* Do this so that we dont overwrite the original packet
|
|
* contents.
|
|
*/
|
|
for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
|
|
c = *s++;
|
|
if (c == 0x7d) {
|
|
if (i > 1) {
|
|
i--;
|
|
c = *s++ ^ 0x20;
|
|
} else
|
|
continue;
|
|
}
|
|
*t++ = c;
|
|
}
|
|
|
|
se = snapend;
|
|
snapend = t;
|
|
|
|
/* now lets guess about the payload codepoint format */
|
|
proto = *b; /* start with a one-octet codepoint guess */
|
|
|
|
switch (proto) {
|
|
case PPP_IP:
|
|
ip_print(gndo, b+1, t - b - 1);
|
|
goto cleanup;
|
|
#ifdef INET6
|
|
case PPP_IPV6:
|
|
ip6_print(b+1, t - b - 1);
|
|
goto cleanup;
|
|
#endif
|
|
default: /* no luck - try next guess */
|
|
break;
|
|
}
|
|
|
|
proto = EXTRACT_16BITS(b); /* next guess - load two octets */
|
|
|
|
switch (proto) {
|
|
case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
|
|
proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
|
|
handle_ppp(proto, b+4, t - b - 4);
|
|
break;
|
|
default: /* last guess - proto must be a PPP proto-id */
|
|
handle_ppp(proto, b+2, t - b - 2);
|
|
break;
|
|
}
|
|
|
|
cleanup:
|
|
snapend = se;
|
|
free(b);
|
|
return;
|
|
}
|
|
|
|
|
|
/* PPP */
|
|
static void
|
|
handle_ppp(u_int proto, const u_char *p, int length)
|
|
{
|
|
if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */
|
|
ppp_hdlc(p-1, length);
|
|
return;
|
|
}
|
|
|
|
switch (proto) {
|
|
case PPP_LCP: /* fall through */
|
|
case PPP_IPCP:
|
|
case PPP_OSICP:
|
|
case PPP_MPLSCP:
|
|
case PPP_IPV6CP:
|
|
case PPP_CCP:
|
|
case PPP_BACP:
|
|
handle_ctrl_proto(proto, p, length);
|
|
break;
|
|
case PPP_ML:
|
|
handle_mlppp(p, length);
|
|
break;
|
|
case PPP_CHAP:
|
|
handle_chap(p, length);
|
|
break;
|
|
case PPP_PAP:
|
|
handle_pap(p, length);
|
|
break;
|
|
case PPP_BAP: /* XXX: not yet completed */
|
|
handle_bap(p, length);
|
|
break;
|
|
case ETHERTYPE_IP: /*XXX*/
|
|
case PPP_VJNC:
|
|
case PPP_IP:
|
|
ip_print(gndo, p, length);
|
|
break;
|
|
#ifdef INET6
|
|
case ETHERTYPE_IPV6: /*XXX*/
|
|
case PPP_IPV6:
|
|
ip6_print(p, length);
|
|
break;
|
|
#endif
|
|
case ETHERTYPE_IPX: /*XXX*/
|
|
case PPP_IPX:
|
|
ipx_print(p, length);
|
|
break;
|
|
case PPP_OSI:
|
|
isoclns_print(p, length, length);
|
|
break;
|
|
case PPP_MPLS_UCAST:
|
|
case PPP_MPLS_MCAST:
|
|
mpls_print(p, length);
|
|
break;
|
|
case PPP_COMP:
|
|
printf("compressed PPP data");
|
|
break;
|
|
default:
|
|
printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
|
|
print_unknown_data(p,"\n\t",length);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Standard PPP printer */
|
|
u_int
|
|
ppp_print(register const u_char *p, u_int length)
|
|
{
|
|
u_int proto,ppp_header;
|
|
u_int olen = length; /* _o_riginal length */
|
|
u_int hdr_len = 0;
|
|
|
|
/*
|
|
* Here, we assume that p points to the Address and Control
|
|
* field (if they present).
|
|
*/
|
|
if (length < 2)
|
|
goto trunc;
|
|
TCHECK2(*p, 2);
|
|
ppp_header = EXTRACT_16BITS(p);
|
|
|
|
switch(ppp_header) {
|
|
case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
|
|
if (eflag) printf("In ");
|
|
p += 2;
|
|
length -= 2;
|
|
hdr_len += 2;
|
|
break;
|
|
case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
|
|
if (eflag) printf("Out ");
|
|
p += 2;
|
|
length -= 2;
|
|
hdr_len += 2;
|
|
break;
|
|
case (PPP_ADDRESS << 8 | PPP_CONTROL):
|
|
p += 2; /* ACFC not used */
|
|
length -= 2;
|
|
hdr_len += 2;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (length < 2)
|
|
goto trunc;
|
|
TCHECK(*p);
|
|
if (*p % 2) {
|
|
proto = *p; /* PFC is used */
|
|
p++;
|
|
length--;
|
|
hdr_len++;
|
|
} else {
|
|
TCHECK2(*p, 2);
|
|
proto = EXTRACT_16BITS(p);
|
|
p += 2;
|
|
length -= 2;
|
|
hdr_len += 2;
|
|
}
|
|
|
|
if (eflag)
|
|
printf("%s (0x%04x), length %u: ",
|
|
tok2str(ppptype2str, "unknown", proto),
|
|
proto,
|
|
olen);
|
|
|
|
handle_ppp(proto, p, length);
|
|
return (hdr_len);
|
|
trunc:
|
|
printf("[|ppp]");
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* PPP I/F printer */
|
|
u_int
|
|
ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
|
|
{
|
|
register u_int length = h->len;
|
|
register u_int caplen = h->caplen;
|
|
|
|
if (caplen < PPP_HDRLEN) {
|
|
printf("[|ppp]");
|
|
return (caplen);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* XXX: seems to assume that there are 2 octets prepended to an
|
|
* actual PPP frame. The 1st octet looks like Input/Output flag
|
|
* while 2nd octet is unknown, at least to me
|
|
* (mshindo@mshindo.net).
|
|
*
|
|
* That was what the original tcpdump code did.
|
|
*
|
|
* FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
|
|
* packets and 0 for inbound packets - but only if the
|
|
* protocol field has the 0x8000 bit set (i.e., it's a network
|
|
* control protocol); it does so before running the packet through
|
|
* "bpf_filter" to see if it should be discarded, and to see
|
|
* if we should update the time we sent the most recent packet...
|
|
*
|
|
* ...but it puts the original address field back after doing
|
|
* so.
|
|
*
|
|
* NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
|
|
*
|
|
* I don't know if any PPP implementation handed up to a BPF
|
|
* device packets with the first octet being 1 for outbound and
|
|
* 0 for inbound packets, so I (guy@alum.mit.edu) don't know
|
|
* whether that ever needs to be checked or not.
|
|
*
|
|
* Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
|
|
* and its tcpdump appears to assume that the frame always
|
|
* begins with an address field and a control field, and that
|
|
* the address field might be 0x0f or 0x8f, for Cisco
|
|
* point-to-point with HDLC framing as per section 4.3.1 of RFC
|
|
* 1547, as well as 0xff, for PPP in HDLC-like framing as per
|
|
* RFC 1662.
|
|
*
|
|
* (Is the Cisco framing in question what DLT_C_HDLC, in
|
|
* BSD/OS, is?)
|
|
*/
|
|
if (eflag)
|
|
printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
|
|
#endif
|
|
|
|
ppp_print(p, length);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
|
|
* framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
|
|
* is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
|
|
* discard them *if* those are the first two octets, and parse the remaining
|
|
* packet as a PPP packet, as "ppp_print()" does).
|
|
*
|
|
* This handles, for example, DLT_PPP_SERIAL in NetBSD.
|
|
*/
|
|
u_int
|
|
ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
|
|
{
|
|
register u_int length = h->len;
|
|
register u_int caplen = h->caplen;
|
|
u_int proto;
|
|
u_int hdrlen = 0;
|
|
|
|
if (caplen < 2) {
|
|
printf("[|ppp]");
|
|
return (caplen);
|
|
}
|
|
|
|
switch (p[0]) {
|
|
|
|
case PPP_ADDRESS:
|
|
if (caplen < 4) {
|
|
printf("[|ppp]");
|
|
return (caplen);
|
|
}
|
|
|
|
if (eflag)
|
|
printf("%02x %02x %d ", p[0], p[1], length);
|
|
p += 2;
|
|
length -= 2;
|
|
hdrlen += 2;
|
|
|
|
proto = EXTRACT_16BITS(p);
|
|
p += 2;
|
|
length -= 2;
|
|
hdrlen += 2;
|
|
printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
|
|
|
|
handle_ppp(proto, p, length);
|
|
break;
|
|
|
|
case CHDLC_UNICAST:
|
|
case CHDLC_BCAST:
|
|
return (chdlc_if_print(h, p));
|
|
|
|
default:
|
|
if (eflag)
|
|
printf("%02x %02x %d ", p[0], p[1], length);
|
|
p += 2;
|
|
length -= 2;
|
|
hdrlen += 2;
|
|
|
|
/*
|
|
* XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
|
|
* the next two octets as an Ethernet type; does that
|
|
* ever happen?
|
|
*/
|
|
printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
|
|
break;
|
|
}
|
|
|
|
return (hdrlen);
|
|
}
|
|
|
|
#define PPP_BSDI_HDRLEN 24
|
|
|
|
/* BSD/OS specific PPP printer */
|
|
u_int
|
|
ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
|
|
{
|
|
register int hdrlength;
|
|
#ifdef __bsdi__
|
|
register u_int length = h->len;
|
|
register u_int caplen = h->caplen;
|
|
u_int16_t ptype;
|
|
const u_char *q;
|
|
int i;
|
|
|
|
if (caplen < PPP_BSDI_HDRLEN) {
|
|
printf("[|ppp]");
|
|
return (caplen)
|
|
}
|
|
|
|
hdrlength = 0;
|
|
|
|
#if 0
|
|
if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
|
|
if (eflag)
|
|
printf("%02x %02x ", p[0], p[1]);
|
|
p += 2;
|
|
hdrlength = 2;
|
|
}
|
|
|
|
if (eflag)
|
|
printf("%d ", length);
|
|
/* Retrieve the protocol type */
|
|
if (*p & 01) {
|
|
/* Compressed protocol field */
|
|
ptype = *p;
|
|
if (eflag)
|
|
printf("%02x ", ptype);
|
|
p++;
|
|
hdrlength += 1;
|
|
} else {
|
|
/* Un-compressed protocol field */
|
|
ptype = ntohs(*(u_int16_t *)p);
|
|
if (eflag)
|
|
printf("%04x ", ptype);
|
|
p += 2;
|
|
hdrlength += 2;
|
|
}
|
|
#else
|
|
ptype = 0; /*XXX*/
|
|
if (eflag)
|
|
printf("%c ", p[SLC_DIR] ? 'O' : 'I');
|
|
if (p[SLC_LLHL]) {
|
|
/* link level header */
|
|
struct ppp_header *ph;
|
|
|
|
q = p + SLC_BPFHDRLEN;
|
|
ph = (struct ppp_header *)q;
|
|
if (ph->phdr_addr == PPP_ADDRESS
|
|
&& ph->phdr_ctl == PPP_CONTROL) {
|
|
if (eflag)
|
|
printf("%02x %02x ", q[0], q[1]);
|
|
ptype = ntohs(ph->phdr_type);
|
|
if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
|
|
printf("%s ", tok2str(ppptype2str,
|
|
"proto-#%d", ptype));
|
|
}
|
|
} else {
|
|
if (eflag) {
|
|
printf("LLH=[");
|
|
for (i = 0; i < p[SLC_LLHL]; i++)
|
|
printf("%02x", q[i]);
|
|
printf("] ");
|
|
}
|
|
}
|
|
}
|
|
if (eflag)
|
|
printf("%d ", length);
|
|
if (p[SLC_CHL]) {
|
|
q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
|
|
|
|
switch (ptype) {
|
|
case PPP_VJC:
|
|
ptype = vjc_print(q, ptype);
|
|
hdrlength = PPP_BSDI_HDRLEN;
|
|
p += hdrlength;
|
|
switch (ptype) {
|
|
case PPP_IP:
|
|
ip_print(p, length);
|
|
break;
|
|
#ifdef INET6
|
|
case PPP_IPV6:
|
|
ip6_print(p, length);
|
|
break;
|
|
#endif
|
|
case PPP_MPLS_UCAST:
|
|
case PPP_MPLS_MCAST:
|
|
mpls_print(p, length);
|
|
break;
|
|
}
|
|
goto printx;
|
|
case PPP_VJNC:
|
|
ptype = vjc_print(q, ptype);
|
|
hdrlength = PPP_BSDI_HDRLEN;
|
|
p += hdrlength;
|
|
switch (ptype) {
|
|
case PPP_IP:
|
|
ip_print(p, length);
|
|
break;
|
|
#ifdef INET6
|
|
case PPP_IPV6:
|
|
ip6_print(p, length);
|
|
break;
|
|
#endif
|
|
case PPP_MPLS_UCAST:
|
|
case PPP_MPLS_MCAST:
|
|
mpls_print(p, length);
|
|
break;
|
|
}
|
|
goto printx;
|
|
default:
|
|
if (eflag) {
|
|
printf("CH=[");
|
|
for (i = 0; i < p[SLC_LLHL]; i++)
|
|
printf("%02x", q[i]);
|
|
printf("] ");
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
hdrlength = PPP_BSDI_HDRLEN;
|
|
#endif
|
|
|
|
length -= hdrlength;
|
|
p += hdrlength;
|
|
|
|
switch (ptype) {
|
|
case PPP_IP:
|
|
ip_print(p, length);
|
|
break;
|
|
#ifdef INET6
|
|
case PPP_IPV6:
|
|
ip6_print(p, length);
|
|
break;
|
|
#endif
|
|
case PPP_MPLS_UCAST:
|
|
case PPP_MPLS_MCAST:
|
|
mpls_print(p, length);
|
|
break;
|
|
default:
|
|
printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
|
|
}
|
|
|
|
printx:
|
|
#else /* __bsdi */
|
|
hdrlength = 0;
|
|
#endif /* __bsdi__ */
|
|
return (hdrlength);
|
|
}
|
|
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|