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1867 lines
46 KiB
1867 lines
46 KiB
/* |
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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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|
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/* \summary: Point to Point Protocol (PPP) printer */ |
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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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|
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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|
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#include <netdissect-stdinc.h> |
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|
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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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|
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#include <stdlib.h> |
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|
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#include "netdissect.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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/* |
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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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|
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/* Protocol Codes defined in ppp.h */ |
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|
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static const 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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|
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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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|
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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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{ PPP_CCP, "CCP" }, |
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{ 0, NULL } |
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}; |
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|
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/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ |
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|
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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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|
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static const 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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|
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/* LCP Config Options */ |
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|
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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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|
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#define LCPOPT_MIN LCPOPT_VEXT |
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#define LCPOPT_MAX LCPOPT_PPPMUX |
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|
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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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|
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/* ECP - to be supported */ |
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|
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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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|
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static 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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|
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/* BACP Config Options */ |
|
|
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#define BACPOPT_FPEER 1 /* RFC2125 */ |
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|
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static 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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|
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|
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/* SDCP - to be supported */ |
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|
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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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|
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static const 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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|
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#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ |
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#define IPCPOPT_IPCOMP_MINLEN 14 |
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|
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static const 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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|
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static const 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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static const 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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static const 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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static const 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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static const 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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|
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static const 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 int print_lcp_config_options(netdissect_options *, const u_char *p, int); |
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static int print_ipcp_config_options(netdissect_options *, const u_char *p, int); |
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static int print_ip6cp_config_options(netdissect_options *, const u_char *p, int); |
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static int print_ccp_config_options(netdissect_options *, const u_char *p, int); |
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static int print_bacp_config_options(netdissect_options *, const u_char *p, int); |
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static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, int length); |
|
|
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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(netdissect_options *ndo, |
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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)(netdissect_options *, 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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|
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typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); |
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ND_PRINT((ndo, "%s, ", typestr)); |
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|
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if (length < 4) /* FIXME weak boundary checking */ |
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goto trunc; |
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ND_TCHECK2(*tptr, 2); |
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|
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code = *tptr++; |
|
|
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ND_PRINT((ndo, "%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 (!ndo->ndo_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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ND_TCHECK2(*tptr, 2); |
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len = EXTRACT_16BITS(tptr); |
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tptr += 2; |
|
|
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ND_PRINT((ndo, "\n\tencoded length %u (=Option(s) length %u)", len, len - 4)); |
|
|
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if (ndo->ndo_vflag > 1) |
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print_unknown_data(ndo, pptr - 2, "\n\t", 6); |
|
|
|
|
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switch (code) { |
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case CPCODES_VEXT: |
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if (length < 11) |
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break; |
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ND_TCHECK2(*tptr, 4); |
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ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); |
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tptr += 4; |
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ND_TCHECK2(*tptr, 3); |
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ND_PRINT((ndo, " Vendor: %s (%u)", |
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tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), |
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EXTRACT_24BITS(tptr))); |
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/* XXX: need to decode Kind and Value(s)? */ |
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break; |
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case CPCODES_CONF_REQ: |
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case CPCODES_CONF_ACK: |
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case CPCODES_CONF_NAK: |
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case CPCODES_CONF_REJ: |
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x = len - 4; /* Code(1), Identifier(1) and Length(2) */ |
|
do { |
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switch (proto) { |
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case PPP_LCP: |
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pfunc = print_lcp_config_options; |
|
break; |
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case PPP_IPCP: |
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pfunc = print_ipcp_config_options; |
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break; |
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case PPP_IPV6CP: |
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pfunc = print_ip6cp_config_options; |
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break; |
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case PPP_CCP: |
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pfunc = print_ccp_config_options; |
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break; |
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case PPP_BACP: |
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pfunc = print_bacp_config_options; |
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break; |
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default: |
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/* |
|
* No print routine for the options for |
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* this protocol. |
|
*/ |
|
pfunc = NULL; |
|
break; |
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} |
|
|
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if (pfunc == NULL) /* catch the above null pointer if unknown CP */ |
|
break; |
|
|
|
if ((j = (*pfunc)(ndo, tptr, len)) == 0) |
|
break; |
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x -= j; |
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tptr += j; |
|
} while (x > 0); |
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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; |
|
ND_TCHECK2(*tptr, 2); |
|
ND_PRINT((ndo, "\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) { |
|
ND_PRINT((ndo, "\n\t Rejected Packet")); |
|
print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2); |
|
} |
|
break; |
|
case CPCODES_ECHO_REQ: |
|
case CPCODES_ECHO_RPL: |
|
case CPCODES_DISC_REQ: |
|
if (length < 8) |
|
break; |
|
ND_TCHECK2(*tptr, 4); |
|
ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); |
|
/* XXX: need to decode Data? - hexdump for now */ |
|
if (len > 8) { |
|
ND_PRINT((ndo, "\n\t -----trailing data-----")); |
|
ND_TCHECK2(tptr[4], len - 8); |
|
print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8); |
|
} |
|
break; |
|
case CPCODES_ID: |
|
if (length < 8) |
|
break; |
|
ND_TCHECK2(*tptr, 4); |
|
ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); |
|
/* RFC 1661 says this is intended to be human readable */ |
|
if (len > 8) { |
|
ND_PRINT((ndo, "\n\t Message\n\t ")); |
|
if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend)) |
|
goto trunc; |
|
} |
|
break; |
|
case CPCODES_TIME_REM: |
|
if (length < 12) |
|
break; |
|
ND_TCHECK2(*tptr, 4); |
|
ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); |
|
ND_TCHECK2(*(tptr + 4), 4); |
|
ND_PRINT((ndo, ", 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 (ndo->ndo_vflag <= 1) |
|
print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2); |
|
break; |
|
} |
|
return; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|%s]", typestr)); |
|
} |
|
|
|
/* LCP config options */ |
|
static int |
|
print_lcp_config_options(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
int len, opt; |
|
|
|
if (length < 2) |
|
return 0; |
|
ND_TCHECK2(*p, 2); |
|
len = p[1]; |
|
opt = p[0]; |
|
if (length < len) |
|
return 0; |
|
if (len < 2) { |
|
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", |
|
lcpconfopts[opt], opt, len)); |
|
else |
|
ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); |
|
return 0; |
|
} |
|
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len)); |
|
else { |
|
ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); |
|
return len; |
|
} |
|
|
|
switch (opt) { |
|
case LCPOPT_VEXT: |
|
if (len < 6) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 6)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 3); |
|
ND_PRINT((ndo, ": Vendor: %s (%u)", |
|
tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), |
|
EXTRACT_24BITS(p + 2))); |
|
#if 0 |
|
ND_TCHECK(p[5]); |
|
ND_PRINT((ndo, ", kind: 0x%02x", p[5])); |
|
ND_PRINT((ndo, ", Value: 0x")); |
|
for (i = 0; i < len - 6; i++) { |
|
ND_TCHECK(p[6 + i]); |
|
ND_PRINT((ndo, "%02x", p[6 + i])); |
|
} |
|
#endif |
|
break; |
|
case LCPOPT_MRU: |
|
if (len != 4) { |
|
ND_PRINT((ndo, " (length bogus, should be = 4)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); |
|
break; |
|
case LCPOPT_ACCM: |
|
if (len != 6) { |
|
ND_PRINT((ndo, " (length bogus, should be = 6)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 4); |
|
ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); |
|
break; |
|
case LCPOPT_AP: |
|
if (len < 4) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 4)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
ND_PRINT((ndo, ": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_16BITS(p + 2)))); |
|
|
|
switch (EXTRACT_16BITS(p+2)) { |
|
case PPP_CHAP: |
|
ND_TCHECK(p[4]); |
|
ND_PRINT((ndo, ", %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(ndo, p, "\n\t", len); |
|
} |
|
break; |
|
case LCPOPT_QP: |
|
if (len < 4) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 4)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
if (EXTRACT_16BITS(p+2) == PPP_LQM) |
|
ND_PRINT((ndo, ": LQR")); |
|
else |
|
ND_PRINT((ndo, ": unknown")); |
|
break; |
|
case LCPOPT_MN: |
|
if (len != 6) { |
|
ND_PRINT((ndo, " (length bogus, should be = 6)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 4); |
|
ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); |
|
break; |
|
case LCPOPT_PFC: |
|
break; |
|
case LCPOPT_ACFC: |
|
break; |
|
case LCPOPT_LD: |
|
if (len != 4) { |
|
ND_PRINT((ndo, " (length bogus, should be = 4)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
ND_PRINT((ndo, ": 0x%04x", EXTRACT_16BITS(p + 2))); |
|
break; |
|
case LCPOPT_CBACK: |
|
if (len < 3) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 3)")); |
|
return 0; |
|
} |
|
ND_PRINT((ndo, ": ")); |
|
ND_TCHECK(p[2]); |
|
ND_PRINT((ndo, ": Callback Operation %s (%u)", |
|
tok2str(ppp_callback_values, "Unknown", p[2]), |
|
p[2])); |
|
break; |
|
case LCPOPT_MLMRRU: |
|
if (len != 4) { |
|
ND_PRINT((ndo, " (length bogus, should be = 4)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); |
|
break; |
|
case LCPOPT_MLED: |
|
if (len < 3) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 3)")); |
|
return 0; |
|
} |
|
ND_TCHECK(p[2]); |
|
switch (p[2]) { /* class */ |
|
case MEDCLASS_NULL: |
|
ND_PRINT((ndo, ": Null")); |
|
break; |
|
case MEDCLASS_LOCAL: |
|
ND_PRINT((ndo, ": Local")); /* XXX */ |
|
break; |
|
case MEDCLASS_IPV4: |
|
if (len != 7) { |
|
ND_PRINT((ndo, " (length bogus, should be = 7)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 3), 4); |
|
ND_PRINT((ndo, ": IPv4 %s", ipaddr_string(ndo, p + 3))); |
|
break; |
|
case MEDCLASS_MAC: |
|
if (len != 9) { |
|
ND_PRINT((ndo, " (length bogus, should be = 9)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 3), 6); |
|
ND_PRINT((ndo, ": MAC %s", etheraddr_string(ndo, p + 3))); |
|
break; |
|
case MEDCLASS_MNB: |
|
ND_PRINT((ndo, ": Magic-Num-Block")); /* XXX */ |
|
break; |
|
case MEDCLASS_PSNDN: |
|
ND_PRINT((ndo, ": PSNDN")); /* XXX */ |
|
break; |
|
default: |
|
ND_PRINT((ndo, ": Unknown class %u", p[2])); |
|
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: |
|
/* |
|
* Unknown option; dump it as raw bytes now if we're |
|
* not going to do so below. |
|
*/ |
|
if (ndo->ndo_vflag < 2) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); |
|
break; |
|
} |
|
|
|
if (ndo->ndo_vflag > 1) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ |
|
|
|
return len; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|lcp]")); |
|
return 0; |
|
} |
|
|
|
/* ML-PPP*/ |
|
static const struct tok ppp_ml_flag_values[] = { |
|
{ 0x80, "begin" }, |
|
{ 0x40, "end" }, |
|
{ 0, NULL } |
|
}; |
|
|
|
static void |
|
handle_mlppp(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
if (!ndo->ndo_eflag) |
|
ND_PRINT((ndo, "MLPPP, ")); |
|
|
|
ND_PRINT((ndo, "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)); |
|
} |
|
|
|
/* CHAP */ |
|
static void |
|
handle_chap(netdissect_options *ndo, |
|
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) { |
|
ND_PRINT((ndo, "[|chap]")); |
|
return; |
|
} else if (length < 4) { |
|
ND_TCHECK(*p); |
|
ND_PRINT((ndo, "[|chap 0x%02x]", *p)); |
|
return; |
|
} |
|
|
|
ND_TCHECK(*p); |
|
code = *p; |
|
ND_PRINT((ndo, "CHAP, %s (0x%02x)", |
|
tok2str(chapcode_values,"unknown",code), |
|
code)); |
|
p++; |
|
|
|
ND_TCHECK(*p); |
|
ND_PRINT((ndo, ", id %u", *p)); /* ID */ |
|
p++; |
|
|
|
ND_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; |
|
ND_TCHECK(*p); |
|
val_size = *p; /* value size */ |
|
p++; |
|
if (length - (p - p0) < val_size) |
|
return; |
|
ND_PRINT((ndo, ", Value ")); |
|
for (i = 0; i < val_size; i++) { |
|
ND_TCHECK(*p); |
|
ND_PRINT((ndo, "%02x", *p++)); |
|
} |
|
name_size = len - (p - p0); |
|
ND_PRINT((ndo, ", Name ")); |
|
for (i = 0; i < name_size; i++) { |
|
ND_TCHECK(*p); |
|
safeputchar(ndo, *p++); |
|
} |
|
break; |
|
case CHAP_SUCC: |
|
case CHAP_FAIL: |
|
msg_size = len - (p - p0); |
|
ND_PRINT((ndo, ", Msg ")); |
|
for (i = 0; i< msg_size; i++) { |
|
ND_TCHECK(*p); |
|
safeputchar(ndo, *p++); |
|
} |
|
break; |
|
} |
|
return; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|chap]")); |
|
} |
|
|
|
/* PAP (see RFC 1334) */ |
|
static void |
|
handle_pap(netdissect_options *ndo, |
|
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) { |
|
ND_PRINT((ndo, "[|pap]")); |
|
return; |
|
} else if (length < 4) { |
|
ND_TCHECK(*p); |
|
ND_PRINT((ndo, "[|pap 0x%02x]", *p)); |
|
return; |
|
} |
|
|
|
ND_TCHECK(*p); |
|
code = *p; |
|
ND_PRINT((ndo, "PAP, %s (0x%02x)", |
|
tok2str(papcode_values, "unknown", code), |
|
code)); |
|
p++; |
|
|
|
ND_TCHECK(*p); |
|
ND_PRINT((ndo, ", id %u", *p)); /* ID */ |
|
p++; |
|
|
|
ND_TCHECK2(*p, 2); |
|
len = EXTRACT_16BITS(p); |
|
p += 2; |
|
|
|
if ((int)len > length) { |
|
ND_PRINT((ndo, ", length %u > packet size", len)); |
|
return; |
|
} |
|
length = len; |
|
if (length < (p - p0)) { |
|
ND_PRINT((ndo, ", length %u < PAP header length", length)); |
|
return; |
|
} |
|
|
|
switch (code) { |
|
case PAP_AREQ: |
|
/* A valid Authenticate-Request is 6 or more octets long. */ |
|
if (len < 6) |
|
goto trunc; |
|
if (length - (p - p0) < 1) |
|
return; |
|
ND_TCHECK(*p); |
|
peerid_len = *p; /* Peer-ID Length */ |
|
p++; |
|
if (length - (p - p0) < peerid_len) |
|
return; |
|
ND_PRINT((ndo, ", Peer ")); |
|
for (i = 0; i < peerid_len; i++) { |
|
ND_TCHECK(*p); |
|
safeputchar(ndo, *p++); |
|
} |
|
|
|
if (length - (p - p0) < 1) |
|
return; |
|
ND_TCHECK(*p); |
|
passwd_len = *p; /* Password Length */ |
|
p++; |
|
if (length - (p - p0) < passwd_len) |
|
return; |
|
ND_PRINT((ndo, ", Name ")); |
|
for (i = 0; i < passwd_len; i++) { |
|
ND_TCHECK(*p); |
|
safeputchar(ndo, *p++); |
|
} |
|
break; |
|
case PAP_AACK: |
|
case PAP_ANAK: |
|
/* Although some implementations ignore truncation at |
|
* this point and at least one generates a truncated |
|
* packet, RFC 1334 section 2.2.2 clearly states that |
|
* both AACK and ANAK are at least 5 bytes long. |
|
*/ |
|
if (len < 5) |
|
goto trunc; |
|
if (length - (p - p0) < 1) |
|
return; |
|
ND_TCHECK(*p); |
|
msg_len = *p; /* Msg-Length */ |
|
p++; |
|
if (length - (p - p0) < msg_len) |
|
return; |
|
ND_PRINT((ndo, ", Msg ")); |
|
for (i = 0; i< msg_len; i++) { |
|
ND_TCHECK(*p); |
|
safeputchar(ndo, *p++); |
|
} |
|
break; |
|
} |
|
return; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|pap]")); |
|
} |
|
|
|
/* BAP */ |
|
static void |
|
handle_bap(netdissect_options *ndo _U_, |
|
const u_char *p _U_, int length _U_) |
|
{ |
|
/* XXX: to be supported!! */ |
|
} |
|
|
|
|
|
/* IPCP config options */ |
|
static int |
|
print_ipcp_config_options(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
int len, opt; |
|
u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; |
|
|
|
if (length < 2) |
|
return 0; |
|
ND_TCHECK2(*p, 2); |
|
len = p[1]; |
|
opt = p[0]; |
|
if (length < len) |
|
return 0; |
|
if (len < 2) { |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", |
|
tok2str(ipcpopt_values,"unknown",opt), |
|
opt, |
|
len)); |
|
return 0; |
|
} |
|
|
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", |
|
tok2str(ipcpopt_values,"unknown",opt), |
|
opt, |
|
len)); |
|
|
|
switch (opt) { |
|
case IPCPOPT_2ADDR: /* deprecated */ |
|
if (len != 10) { |
|
ND_PRINT((ndo, " (length bogus, should be = 10)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 6), 4); |
|
ND_PRINT((ndo, ": src %s, dst %s", |
|
ipaddr_string(ndo, p + 2), |
|
ipaddr_string(ndo, p + 6))); |
|
break; |
|
case IPCPOPT_IPCOMP: |
|
if (len < 4) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 4)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 2); |
|
compproto = EXTRACT_16BITS(p+2); |
|
|
|
ND_PRINT((ndo, ": %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) { |
|
ND_PRINT((ndo, " (length bogus, should be >= %u)", |
|
IPCPOPT_IPCOMP_MINLEN)); |
|
return 0; |
|
} |
|
|
|
ND_TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); |
|
ND_PRINT((ndo, "\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; |
|
|
|
ND_PRINT((ndo, "\n\t Suboptions, length %u", ipcomp_subopttotallen)); |
|
|
|
while (ipcomp_subopttotallen >= 2) { |
|
ND_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 */ |
|
ND_PRINT((ndo, "\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) { |
|
ND_PRINT((ndo, " (length bogus, should be = 6)")); |
|
return 0; |
|
} |
|
ND_TCHECK2(*(p + 2), 4); |
|
ND_PRINT((ndo, ": %s", ipaddr_string(ndo, p + 2))); |
|
break; |
|
default: |
|
/* |
|
* Unknown option; dump it as raw bytes now if we're |
|
* not going to do so below. |
|
*/ |
|
if (ndo->ndo_vflag < 2) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); |
|
break; |
|
} |
|
if (ndo->ndo_vflag > 1) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ |
|
return len; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|ipcp]")); |
|
return 0; |
|
} |
|
|
|
/* IP6CP config options */ |
|
static int |
|
print_ip6cp_config_options(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
int len, opt; |
|
|
|
if (length < 2) |
|
return 0; |
|
ND_TCHECK2(*p, 2); |
|
len = p[1]; |
|
opt = p[0]; |
|
if (length < len) |
|
return 0; |
|
if (len < 2) { |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", |
|
tok2str(ip6cpopt_values,"unknown",opt), |
|
opt, |
|
len)); |
|
return 0; |
|
} |
|
|
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", |
|
tok2str(ip6cpopt_values,"unknown",opt), |
|
opt, |
|
len)); |
|
|
|
switch (opt) { |
|
case IP6CP_IFID: |
|
if (len != 10) { |
|
ND_PRINT((ndo, " (length bogus, should be = 10)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 8); |
|
ND_PRINT((ndo, ": %04x:%04x:%04x:%04x", |
|
EXTRACT_16BITS(p + 2), |
|
EXTRACT_16BITS(p + 4), |
|
EXTRACT_16BITS(p + 6), |
|
EXTRACT_16BITS(p + 8))); |
|
break; |
|
default: |
|
/* |
|
* Unknown option; dump it as raw bytes now if we're |
|
* not going to do so below. |
|
*/ |
|
if (ndo->ndo_vflag < 2) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); |
|
break; |
|
} |
|
if (ndo->ndo_vflag > 1) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ |
|
|
|
return len; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|ip6cp]")); |
|
return 0; |
|
} |
|
|
|
|
|
/* CCP config options */ |
|
static int |
|
print_ccp_config_options(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
int len, opt; |
|
|
|
if (length < 2) |
|
return 0; |
|
ND_TCHECK2(*p, 2); |
|
len = p[1]; |
|
opt = p[0]; |
|
if (length < len) |
|
return 0; |
|
if (len < 2) { |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", |
|
tok2str(ccpconfopts_values, "Unknown", opt), |
|
opt, |
|
len)); |
|
return 0; |
|
} |
|
|
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", |
|
tok2str(ccpconfopts_values, "Unknown", opt), |
|
opt, |
|
len)); |
|
|
|
switch (opt) { |
|
case CCPOPT_BSDCOMP: |
|
if (len < 3) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 3)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 1); |
|
ND_PRINT((ndo, ": Version: %u, Dictionary Bits: %u", |
|
p[2] >> 5, p[2] & 0x1f)); |
|
break; |
|
case CCPOPT_MVRCA: |
|
if (len < 4) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 4)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 1); |
|
ND_PRINT((ndo, ": Features: %u, PxP: %s, History: %u, #CTX-ID: %u", |
|
(p[2] & 0xc0) >> 6, |
|
(p[2] & 0x20) ? "Enabled" : "Disabled", |
|
p[2] & 0x1f, p[3])); |
|
break; |
|
case CCPOPT_DEFLATE: |
|
if (len < 4) { |
|
ND_PRINT((ndo, " (length bogus, should be >= 4)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 1); |
|
ND_PRINT((ndo, ": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u", |
|
(p[2] & 0xf0) >> 4, |
|
((p[2] & 0x0f) == 8) ? "zlib" : "unkown", |
|
p[2] & 0x0f, (p[3] & 0xfc) >> 2, p[3] & 0x03)); |
|
break; |
|
|
|
/* XXX: to be supported */ |
|
#if 0 |
|
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_LZSDCP: |
|
case CCPOPT_DEC: |
|
case CCPOPT_RESV: |
|
break; |
|
#endif |
|
default: |
|
/* |
|
* Unknown option; dump it as raw bytes now if we're |
|
* not going to do so below. |
|
*/ |
|
if (ndo->ndo_vflag < 2) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); |
|
break; |
|
} |
|
if (ndo->ndo_vflag > 1) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ |
|
|
|
return len; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|ccp]")); |
|
return 0; |
|
} |
|
|
|
/* BACP config options */ |
|
static int |
|
print_bacp_config_options(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
int len, opt; |
|
|
|
if (length < 2) |
|
return 0; |
|
ND_TCHECK2(*p, 2); |
|
len = p[1]; |
|
opt = p[0]; |
|
if (length < len) |
|
return 0; |
|
if (len < 2) { |
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", |
|
tok2str(bacconfopts_values, "Unknown", opt), |
|
opt, |
|
len)); |
|
return 0; |
|
} |
|
|
|
ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", |
|
tok2str(bacconfopts_values, "Unknown", opt), |
|
opt, |
|
len)); |
|
|
|
switch (opt) { |
|
case BACPOPT_FPEER: |
|
if (len != 6) { |
|
ND_PRINT((ndo, " (length bogus, should be = 6)")); |
|
return len; |
|
} |
|
ND_TCHECK2(*(p + 2), 4); |
|
ND_PRINT((ndo, ": Magic-Num 0x%08x", EXTRACT_32BITS(p + 2))); |
|
break; |
|
default: |
|
/* |
|
* Unknown option; dump it as raw bytes now if we're |
|
* not going to do so below. |
|
*/ |
|
if (ndo->ndo_vflag < 2) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); |
|
break; |
|
} |
|
if (ndo->ndo_vflag > 1) |
|
print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ |
|
|
|
return len; |
|
|
|
trunc: |
|
ND_PRINT((ndo, "[|bacp]")); |
|
return 0; |
|
} |
|
|
|
static void |
|
ppp_hdlc(netdissect_options *ndo, |
|
const u_char *p, int length) |
|
{ |
|
u_char *b, *t, c; |
|
const u_char *s; |
|
int i, proto; |
|
const void *se; |
|
|
|
if (length <= 0) |
|
return; |
|
|
|
b = (u_char *)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 = p, t = b, i = length; i > 0 && ND_TTEST(*s); i--) { |
|
c = *s++; |
|
if (c == 0x7d) { |
|
if (i <= 1 || !ND_TTEST(*s)) |
|
break; |
|
i--; |
|
c = *s++ ^ 0x20; |
|
} |
|
*t++ = c; |
|
} |
|
|
|
se = ndo->ndo_snapend; |
|
ndo->ndo_snapend = t; |
|
length = t - b; |
|
|
|
/* now lets guess about the payload codepoint format */ |
|
if (length < 1) |
|
goto trunc; |
|
proto = *b; /* start with a one-octet codepoint guess */ |
|
|
|
switch (proto) { |
|
case PPP_IP: |
|
ip_print(ndo, b + 1, length - 1); |
|
goto cleanup; |
|
case PPP_IPV6: |
|
ip6_print(ndo, b + 1, length - 1); |
|
goto cleanup; |
|
default: /* no luck - try next guess */ |
|
break; |
|
} |
|
|
|
if (length < 2) |
|
goto trunc; |
|
proto = EXTRACT_16BITS(b); /* next guess - load two octets */ |
|
|
|
switch (proto) { |
|
case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ |
|
if (length < 4) |
|
goto trunc; |
|
proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ |
|
handle_ppp(ndo, proto, b + 4, length - 4); |
|
break; |
|
default: /* last guess - proto must be a PPP proto-id */ |
|
handle_ppp(ndo, proto, b + 2, length - 2); |
|
break; |
|
} |
|
|
|
cleanup: |
|
ndo->ndo_snapend = se; |
|
free(b); |
|
return; |
|
|
|
trunc: |
|
ndo->ndo_snapend = se; |
|
free(b); |
|
ND_PRINT((ndo, "[|ppp]")); |
|
} |
|
|
|
|
|
/* PPP */ |
|
static void |
|
handle_ppp(netdissect_options *ndo, |
|
u_int proto, const u_char *p, int length) |
|
{ |
|
if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */ |
|
ppp_hdlc(ndo, 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(ndo, proto, p, length); |
|
break; |
|
case PPP_ML: |
|
handle_mlppp(ndo, p, length); |
|
break; |
|
case PPP_CHAP: |
|
handle_chap(ndo, p, length); |
|
break; |
|
case PPP_PAP: |
|
handle_pap(ndo, p, length); |
|
break; |
|
case PPP_BAP: /* XXX: not yet completed */ |
|
handle_bap(ndo, p, length); |
|
break; |
|
case ETHERTYPE_IP: /*XXX*/ |
|
case PPP_VJNC: |
|
case PPP_IP: |
|
ip_print(ndo, p, length); |
|
break; |
|
case ETHERTYPE_IPV6: /*XXX*/ |
|
case PPP_IPV6: |
|
ip6_print(ndo, p, length); |
|
break; |
|
case ETHERTYPE_IPX: /*XXX*/ |
|
case PPP_IPX: |
|
ipx_print(ndo, p, length); |
|
break; |
|
case PPP_OSI: |
|
isoclns_print(ndo, p, length, length); |
|
break; |
|
case PPP_MPLS_UCAST: |
|
case PPP_MPLS_MCAST: |
|
mpls_print(ndo, p, length); |
|
break; |
|
case PPP_COMP: |
|
ND_PRINT((ndo, "compressed PPP data")); |
|
break; |
|
default: |
|
ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto))); |
|
print_unknown_data(ndo, p, "\n\t", length); |
|
break; |
|
} |
|
} |
|
|
|
/* Standard PPP printer */ |
|
u_int |
|
ppp_print(netdissect_options *ndo, |
|
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; |
|
ND_TCHECK2(*p, 2); |
|
ppp_header = EXTRACT_16BITS(p); |
|
|
|
switch(ppp_header) { |
|
case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): |
|
if (ndo->ndo_eflag) ND_PRINT((ndo, "In ")); |
|
p += 2; |
|
length -= 2; |
|
hdr_len += 2; |
|
break; |
|
case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): |
|
if (ndo->ndo_eflag) ND_PRINT((ndo, "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; |
|
ND_TCHECK(*p); |
|
if (*p % 2) { |
|
proto = *p; /* PFC is used */ |
|
p++; |
|
length--; |
|
hdr_len++; |
|
} else { |
|
ND_TCHECK2(*p, 2); |
|
proto = EXTRACT_16BITS(p); |
|
p += 2; |
|
length -= 2; |
|
hdr_len += 2; |
|
} |
|
|
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%s (0x%04x), length %u: ", |
|
tok2str(ppptype2str, "unknown", proto), |
|
proto, |
|
olen)); |
|
|
|
handle_ppp(ndo, proto, p, length); |
|
return (hdr_len); |
|
trunc: |
|
ND_PRINT((ndo, "[|ppp]")); |
|
return (0); |
|
} |
|
|
|
|
|
/* PPP I/F printer */ |
|
u_int |
|
ppp_if_print(netdissect_options *ndo, |
|
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) { |
|
ND_PRINT((ndo, "[|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 (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1])); |
|
#endif |
|
|
|
ppp_print(ndo, 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(netdissect_options *ndo, |
|
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) { |
|
ND_PRINT((ndo, "[|ppp]")); |
|
return (caplen); |
|
} |
|
|
|
switch (p[0]) { |
|
|
|
case PPP_ADDRESS: |
|
if (caplen < 4) { |
|
ND_PRINT((ndo, "[|ppp]")); |
|
return (caplen); |
|
} |
|
|
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length)); |
|
p += 2; |
|
length -= 2; |
|
hdrlen += 2; |
|
|
|
proto = EXTRACT_16BITS(p); |
|
p += 2; |
|
length -= 2; |
|
hdrlen += 2; |
|
ND_PRINT((ndo, "%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto))); |
|
|
|
handle_ppp(ndo, proto, p, length); |
|
break; |
|
|
|
case CHDLC_UNICAST: |
|
case CHDLC_BCAST: |
|
return (chdlc_if_print(ndo, h, p)); |
|
|
|
default: |
|
if (caplen < 4) { |
|
ND_PRINT((ndo, "[|ppp]")); |
|
return (caplen); |
|
} |
|
|
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length)); |
|
p += 2; |
|
hdrlen += 2; |
|
|
|
/* |
|
* XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats |
|
* the next two octets as an Ethernet type; does that |
|
* ever happen? |
|
*/ |
|
ND_PRINT((ndo, "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(netdissect_options *ndo _U_, |
|
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; |
|
uint16_t ptype; |
|
const u_char *q; |
|
int i; |
|
|
|
if (caplen < PPP_BSDI_HDRLEN) { |
|
ND_PRINT((ndo, "[|ppp]")); |
|
return (caplen) |
|
} |
|
|
|
hdrlength = 0; |
|
|
|
#if 0 |
|
if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { |
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%02x %02x ", p[0], p[1])); |
|
p += 2; |
|
hdrlength = 2; |
|
} |
|
|
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%d ", length)); |
|
/* Retrieve the protocol type */ |
|
if (*p & 01) { |
|
/* Compressed protocol field */ |
|
ptype = *p; |
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%02x ", ptype)); |
|
p++; |
|
hdrlength += 1; |
|
} else { |
|
/* Un-compressed protocol field */ |
|
ptype = EXTRACT_16BITS(p); |
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%04x ", ptype)); |
|
p += 2; |
|
hdrlength += 2; |
|
} |
|
#else |
|
ptype = 0; /*XXX*/ |
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%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 (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%02x %02x ", q[0], q[1])); |
|
ptype = EXTRACT_16BITS(&ph->phdr_type); |
|
if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { |
|
ND_PRINT((ndo, "%s ", tok2str(ppptype2str, |
|
"proto-#%d", ptype))); |
|
} |
|
} else { |
|
if (ndo->ndo_eflag) { |
|
ND_PRINT((ndo, "LLH=[")); |
|
for (i = 0; i < p[SLC_LLHL]; i++) |
|
ND_PRINT((ndo, "%02x", q[i])); |
|
ND_PRINT((ndo, "] ")); |
|
} |
|
} |
|
} |
|
if (ndo->ndo_eflag) |
|
ND_PRINT((ndo, "%d ", length)); |
|
if (p[SLC_CHL]) { |
|
q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; |
|
|
|
switch (ptype) { |
|
case PPP_VJC: |
|
ptype = vjc_print(ndo, q, ptype); |
|
hdrlength = PPP_BSDI_HDRLEN; |
|
p += hdrlength; |
|
switch (ptype) { |
|
case PPP_IP: |
|
ip_print(ndo, p, length); |
|
break; |
|
case PPP_IPV6: |
|
ip6_print(ndo, p, length); |
|
break; |
|
case PPP_MPLS_UCAST: |
|
case PPP_MPLS_MCAST: |
|
mpls_print(ndo, p, length); |
|
break; |
|
} |
|
goto printx; |
|
case PPP_VJNC: |
|
ptype = vjc_print(ndo, q, ptype); |
|
hdrlength = PPP_BSDI_HDRLEN; |
|
p += hdrlength; |
|
switch (ptype) { |
|
case PPP_IP: |
|
ip_print(ndo, p, length); |
|
break; |
|
case PPP_IPV6: |
|
ip6_print(ndo, p, length); |
|
break; |
|
case PPP_MPLS_UCAST: |
|
case PPP_MPLS_MCAST: |
|
mpls_print(ndo, p, length); |
|
break; |
|
} |
|
goto printx; |
|
default: |
|
if (ndo->ndo_eflag) { |
|
ND_PRINT((ndo, "CH=[")); |
|
for (i = 0; i < p[SLC_LLHL]; i++) |
|
ND_PRINT((ndo, "%02x", q[i])); |
|
ND_PRINT((ndo, "] ")); |
|
} |
|
break; |
|
} |
|
} |
|
|
|
hdrlength = PPP_BSDI_HDRLEN; |
|
#endif |
|
|
|
length -= hdrlength; |
|
p += hdrlength; |
|
|
|
switch (ptype) { |
|
case PPP_IP: |
|
ip_print(p, length); |
|
break; |
|
case PPP_IPV6: |
|
ip6_print(ndo, p, length); |
|
break; |
|
case PPP_MPLS_UCAST: |
|
case PPP_MPLS_MCAST: |
|
mpls_print(ndo, p, length); |
|
break; |
|
default: |
|
ND_PRINT((ndo, "%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: |
|
*/
|
|
|