print-ppp.c

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/*
 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Extensively modified by Motonori Shindo ([e-mail]) for more
 * complete PPP support.
 */

/*
 * TODO:
 * o resolve XXX as much as possible
 * o MP support
 * o BAP support
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 hannes Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#ifdef __bsdi__
#include <net/slcompress.h>
#include <net/if_ppp.h>
#endif

#include <pcap.h>
#include <stdio.h>
#include <stdlib.h>

#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ppp.h"
#include "chdlc.h"
#include "ethertype.h"
#include "oui.h"

/*
 * The following constatns are defined by IANA. Please refer to
 *    http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
 * for the up-to-date information.
 */

/* Protocol Codes defined in ppp.h */

struct tok ppptype2str[] = {
        { PPP_IP,	  "IP" },
        { PPP_OSI,	  "OSI" },
        { PPP_NS,	  "NS" },
        { PPP_DECNET,	  "DECNET" },
        { PPP_APPLE,	  "APPLE" },
	{ PPP_IPX,	  "IPX" },
	{ PPP_VJC,	  "VJC IP" },
	{ PPP_VJNC,	  "VJNC IP" },
	{ PPP_BRPDU,	  "BRPDU" },
	{ PPP_STII,	  "STII" },
	{ PPP_VINES,	  "VINES" },
	{ PPP_MPLS_UCAST, "MPLS" },
	{ PPP_MPLS_MCAST, "MPLS" },
        { PPP_COMP,       "Compressed"},
        { PPP_ML,         "MLPPP"},
        { PPP_IPV6,       "IP6"},

	{ PPP_HELLO,	  "HELLO" },
	{ PPP_LUXCOM,	  "LUXCOM" },
	{ PPP_SNS,	  "SNS" },
	{ PPP_IPCP,	  "IPCP" },
	{ PPP_OSICP,	  "OSICP" },
	{ PPP_NSCP,	  "NSCP" },
	{ PPP_DECNETCP,   "DECNETCP" },
	{ PPP_APPLECP,	  "APPLECP" },
	{ PPP_IPXCP,	  "IPXCP" },
	{ PPP_STIICP,	  "STIICP" },
	{ PPP_VINESCP,	  "VINESCP" },
        { PPP_IPV6CP,     "IP6CP" },
	{ PPP_MPLSCP,	  "MPLSCP" },

	{ PPP_LCP,	  "LCP" },
	{ PPP_PAP,	  "PAP" },
	{ PPP_LQM,	  "LQM" },
	{ PPP_CHAP,	  "CHAP" },
	{ PPP_EAP,	  "EAP" },
	{ PPP_SPAP,	  "SPAP" },
	{ PPP_SPAP_OLD,	  "Old-SPAP" },
	{ PPP_BACP,	  "BACP" },
	{ PPP_BAP,	  "BAP" },
	{ PPP_MPCP,	  "MLPPP-CP" },
	{ 0,		  NULL }
};

/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */

#define CPCODES_VEXT		0	/* Vendor-Specific (RFC2153) */
#define CPCODES_CONF_REQ	1	/* Configure-Request */
#define CPCODES_CONF_ACK	2	/* Configure-Ack */
#define CPCODES_CONF_NAK	3	/* Configure-Nak */
#define CPCODES_CONF_REJ	4	/* Configure-Reject */
#define CPCODES_TERM_REQ	5	/* Terminate-Request */
#define CPCODES_TERM_ACK	6	/* Terminate-Ack */
#define CPCODES_CODE_REJ	7	/* Code-Reject */
#define CPCODES_PROT_REJ	8	/* Protocol-Reject (LCP only) */
#define CPCODES_ECHO_REQ	9	/* Echo-Request (LCP only) */
#define CPCODES_ECHO_RPL	10	/* Echo-Reply (LCP only) */
#define CPCODES_DISC_REQ	11	/* Discard-Request (LCP only) */
#define CPCODES_ID		12	/* Identification (LCP only) RFC1570 */
#define CPCODES_TIME_REM	13	/* Time-Remaining (LCP only) RFC1570 */
#define CPCODES_RESET_REQ	14	/* Reset-Request (CCP only) RFC1962 */
#define CPCODES_RESET_REP	15	/* Reset-Reply (CCP only) */

struct tok cpcodes[] = {
	{CPCODES_VEXT,      "Vendor-Extension"}, /* RFC2153 */
	{CPCODES_CONF_REQ,  "Conf-Request"},
        {CPCODES_CONF_ACK,  "Conf-Ack"},
	{CPCODES_CONF_NAK,  "Conf-Nack"},
	{CPCODES_CONF_REJ,  "Conf-Reject"},
	{CPCODES_TERM_REQ,  "Term-Request"},
	{CPCODES_TERM_ACK,  "Term-Ack"},
	{CPCODES_CODE_REJ,  "Code-Reject"},
	{CPCODES_PROT_REJ,  "Prot-Reject"},
	{CPCODES_ECHO_REQ,  "Echo-Request"},
	{CPCODES_ECHO_RPL,  "Echo-Reply"},
	{CPCODES_DISC_REQ,  "Disc-Req"},
	{CPCODES_ID,        "Ident"},            /* RFC1570 */
	{CPCODES_TIME_REM,  "Time-Rem"},         /* RFC1570 */
	{CPCODES_RESET_REQ, "Reset-Req"},        /* RFC1962 */
	{CPCODES_RESET_REP, "Reset-Ack"},        /* RFC1962 */
        {0,                 NULL}
};

/* LCP Config Options */

#define LCPOPT_VEXT	0
#define LCPOPT_MRU	1
#define LCPOPT_ACCM	2
#define LCPOPT_AP	3
#define LCPOPT_QP	4
#define LCPOPT_MN	5
#define LCPOPT_DEP6	6
#define LCPOPT_PFC	7
#define LCPOPT_ACFC	8
#define LCPOPT_FCSALT	9
#define LCPOPT_SDP	10
#define LCPOPT_NUMMODE	11
#define LCPOPT_DEP12	12
#define LCPOPT_CBACK	13
#define LCPOPT_DEP14	14
#define LCPOPT_DEP15	15
#define LCPOPT_DEP16	16
#define LCPOPT_MLMRRU	17
#define LCPOPT_MLSSNHF	18
#define LCPOPT_MLED	19
#define LCPOPT_PROP	20
#define LCPOPT_DCEID	21
#define LCPOPT_MPP	22
#define LCPOPT_LD	23
#define LCPOPT_LCPAOPT	24
#define LCPOPT_COBS	25
#define LCPOPT_PE	26
#define LCPOPT_MLHF	27
#define LCPOPT_I18N	28
#define LCPOPT_SDLOS	29
#define LCPOPT_PPPMUX	30

#define LCPOPT_MIN LCPOPT_VEXT
#define LCPOPT_MAX LCPOPT_PPPMUX

static const char *lcpconfopts[] = {
	"Vend-Ext",		/* (0) */
	"MRU",			/* (1) */
	"ACCM",			/* (2) */
	"Auth-Prot",		/* (3) */
	"Qual-Prot",		/* (4) */
	"Magic-Num",		/* (5) */
	"deprecated(6)",	/* used to be a Quality Protocol */
	"PFC",			/* (7) */
	"ACFC",			/* (8) */
	"FCS-Alt",		/* (9) */
	"SDP",			/* (10) */
	"Num-Mode",		/* (11) */
	"deprecated(12)",	/* used to be a Multi-Link-Procedure*/
	"Call-Back",		/* (13) */
	"deprecated(14)",	/* used to be a Connect-Time */
	"deprecated(15)",	/* used to be a Compund-Frames */
	"deprecated(16)",	/* used to be a Nominal-Data-Encap */
	"MRRU",			/* (17) */
	"12-Bit seq #",		/* (18) */
	"End-Disc",		/* (19) */
	"Proprietary",		/* (20) */
	"DCE-Id",		/* (21) */
	"MP+",			/* (22) */
	"Link-Disc",		/* (23) */
	"LCP-Auth-Opt",		/* (24) */
	"COBS",			/* (25) */
	"Prefix-elision",	/* (26) */
	"Multilink-header-Form",/* (27) */
	"I18N",			/* (28) */
	"SDL-over-SONET/SDH",	/* (29) */
	"PPP-Muxing",		/* (30) */
};

/* ECP - to be supported */

/* CCP Config Options */

#define CCPOPT_OUI	0	/* RFC1962 */
#define CCPOPT_PRED1	1	/* RFC1962 */
#define CCPOPT_PRED2	2	/* RFC1962 */
#define CCPOPT_PJUMP	3	/* RFC1962 */
/* 4-15 unassigned */
#define CCPOPT_HPPPC	16	/* RFC1962 */
#define CCPOPT_STACLZS	17	/* RFC1974 */
#define CCPOPT_MPPC	18	/* RFC2118 */
#define CCPOPT_GFZA	19	/* RFC1962 */
#define CCPOPT_V42BIS	20	/* RFC1962 */
#define CCPOPT_BSDCOMP	21	/* RFC1977 */
/* 22 unassigned */
#define CCPOPT_LZSDCP	23	/* RFC1967 */
#define CCPOPT_MVRCA	24	/* RFC1975 */
#define CCPOPT_DEC	25	/* RFC1976 */
#define CCPOPT_DEFLATE	26	/* RFC1979 */
/* 27-254 unassigned */
#define CCPOPT_RESV	255	/* RFC1962 */

const struct tok ccpconfopts_values[] = {
        { CCPOPT_OUI, "OUI" },
        { CCPOPT_PRED1, "Pred-1" },
        { CCPOPT_PRED2, "Pred-2" },
        { CCPOPT_PJUMP, "Puddle" },
        { CCPOPT_HPPPC, "HP-PPC" },
        { CCPOPT_STACLZS, "Stac-LZS" },
        { CCPOPT_MPPC, "MPPC" },
        { CCPOPT_GFZA, "Gand-FZA" },
        { CCPOPT_V42BIS, "V.42bis" },
        { CCPOPT_BSDCOMP, "BSD-Comp" },
        { CCPOPT_LZSDCP, "LZS-DCP" },
        { CCPOPT_MVRCA, "MVRCA" },
        { CCPOPT_DEC, "DEC" },
        { CCPOPT_DEFLATE, "Deflate" },
        { CCPOPT_RESV, "Reserved"},
        {0,                 NULL}
};

/* BACP Config Options */

#define BACPOPT_FPEER	1	/* RFC2125 */

const struct tok bacconfopts_values[] = {
        { BACPOPT_FPEER, "Favored-Peer" },
        {0,                 NULL}
};


/* SDCP - to be supported */

/* IPCP Config Options */
#define IPCPOPT_2ADDR	1	/* RFC1172, RFC1332 (deprecated) */
#define IPCPOPT_IPCOMP	2	/* RFC1332 */
#define IPCPOPT_ADDR	3	/* RFC1332 */
#define IPCPOPT_MOBILE4	4	/* RFC2290 */
#define IPCPOPT_PRIDNS	129	/* RFC1877 */
#define IPCPOPT_PRINBNS	130	/* RFC1877 */
#define IPCPOPT_SECDNS	131	/* RFC1877 */
#define IPCPOPT_SECNBNS	132	/* RFC1877 */

struct tok ipcpopt_values[] = {
        { IPCPOPT_2ADDR, "IP-Addrs" },
        { IPCPOPT_IPCOMP, "IP-Comp" },
        { IPCPOPT_ADDR, "IP-Addr" },
        { IPCPOPT_MOBILE4, "Home-Addr" },
        { IPCPOPT_PRIDNS, "Pri-DNS" },
        { IPCPOPT_PRINBNS, "Pri-NBNS" },
        { IPCPOPT_SECDNS, "Sec-DNS" },
        { IPCPOPT_SECNBNS, "Sec-NBNS" },
	{ 0,		  NULL }
};

#define IPCPOPT_IPCOMP_HDRCOMP 0x61  /* rfc3544 */
#define IPCPOPT_IPCOMP_MINLEN    14

struct tok ipcpopt_compproto_values[] = {
        { PPP_VJC, "VJ-Comp" },
        { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
	{ 0,		  NULL }
};

struct tok ipcpopt_compproto_subopt_values[] = {
        { 1, "RTP-Compression" },
        { 2, "Enhanced RTP-Compression" },
	{ 0,		  NULL }
};

/* IP6CP Config Options */
#define IP6CP_IFID      1

struct tok ip6cpopt_values[] = {
        { IP6CP_IFID, "Interface-ID" },
	{ 0,		  NULL }
};

/* ATCP - to be supported */
/* OSINLCP - to be supported */
/* BVCP - to be supported */
/* BCP - to be supported */
/* IPXCP - to be supported */
/* MPLSCP - to be supported */

/* Auth Algorithms */

/* 0-4 Reserved (RFC1994) */
#define AUTHALG_CHAPMD5	5	/* RFC1994 */
#define AUTHALG_MSCHAP1	128	/* RFC2433 */
#define AUTHALG_MSCHAP2	129	/* RFC2795 */

struct tok authalg_values[] = {
        { AUTHALG_CHAPMD5, "MD5" },
        { AUTHALG_MSCHAP1, "MS-CHAPv1" },
        { AUTHALG_MSCHAP2, "MS-CHAPv2" },
	{ 0,		  NULL }
};

/* FCS Alternatives - to be supported */

/* Multilink Endpoint Discriminator (RFC1717) */
#define MEDCLASS_NULL	0	/* Null Class */
#define MEDCLASS_LOCAL	1	/* Locally Assigned */
#define MEDCLASS_IPV4	2	/* Internet Protocol (IPv4) */
#define MEDCLASS_MAC	3	/* IEEE 802.1 global MAC address */
#define MEDCLASS_MNB	4	/* PPP Magic Number Block */
#define MEDCLASS_PSNDN	5	/* Public Switched Network Director Number */

/* PPP LCP Callback */
#define CALLBACK_AUTH	0	/* Location determined by user auth */
#define CALLBACK_DSTR	1	/* Dialing string */
#define CALLBACK_LID	2	/* Location identifier */
#define CALLBACK_E164	3	/* E.164 number */
#define CALLBACK_X500	4	/* X.500 distinguished name */
#define CALLBACK_CBCP	6	/* Location is determined during CBCP nego */

struct tok ppp_callback_values[] = {
        { CALLBACK_AUTH, "UserAuth" },
        { CALLBACK_DSTR, "DialString" },
        { CALLBACK_LID, "LocalID" },
        { CALLBACK_E164, "E.164" },
        { CALLBACK_X500, "X.500" },
        { CALLBACK_CBCP, "CBCP" },
	{ 0,		  NULL }
};

/* CHAP */

#define CHAP_CHAL	1
#define CHAP_RESP	2
#define CHAP_SUCC	3
#define CHAP_FAIL	4

struct tok chapcode_values[] = {
	{ CHAP_CHAL, "Challenge" },
	{ CHAP_RESP, "Response" },
	{ CHAP_SUCC, "Success" },
	{ CHAP_FAIL, "Fail" },
        { 0, NULL}
};

/* PAP */

#define PAP_AREQ	1
#define PAP_AACK	2
#define PAP_ANAK	3

struct tok papcode_values[] = {
        { PAP_AREQ, "Auth-Req" },
        { PAP_AACK, "Auth-ACK" },
        { PAP_ANAK, "Auth-NACK" },
        { 0, NULL }
};

/* BAP */
#define BAP_CALLREQ	1
#define BAP_CALLRES	2
#define BAP_CBREQ	3
#define BAP_CBRES	4
#define BAP_LDQREQ	5
#define BAP_LDQRES	6
#define BAP_CSIND	7
#define BAP_CSRES	8

static void handle_ctrl_proto (u_int proto,const u_char *p, int length);
static void handle_chap (const u_char *p, int length);
static void handle_pap (const u_char *p, int length);
static void handle_bap (const u_char *p, int length);
static void handle_mlppp(const u_char *p, int length);
static int print_lcp_config_options (const u_char *p, int);
static int print_ipcp_config_options (const u_char *p, int);
static int print_ip6cp_config_options (const u_char *p, int);
static int print_ccp_config_options (const u_char *p, int);
static int print_bacp_config_options (const u_char *p, int);
static void handle_ppp (u_int proto, const u_char *p, int length);
static void ppp_hdlc(const u_char *p, int length);

/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
static void
handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
{
	const char *typestr;
	u_int code, len;
	int (*pfunc)(const u_char *, int);
	int x, j;
        const u_char *tptr;

        tptr=pptr;

        typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
        printf("%s, ",typestr);

	if (length < 4) /* FIXME weak boundary checking */
		goto trunc;
	TCHECK2(*tptr, 2);

	code = *tptr++;
	
        printf("%s (0x%02x), id %u, length %u",
               tok2str(cpcodes, "Unknown Opcode",code),
               code,
               *tptr++, /* ID */
               length+2);

        if (!vflag)
                return;

	if (length <= 4)
		return;    /* there may be a NULL confreq etc. */

	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);
}