print-ppp.c

Windump3.6.2源代码

/*
 * 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[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.58 2000/12/27 11:09:08 itojun Exp $ (LBL)";
#endif

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

#ifndef WIN32
#include <sys/param.h>
#include <sys/time.h>
#else 
#include <winsock2.h>
#include "bittypes.h"
#include <time.h>
#include "ethertype.h"
#endif /* WIN32 */

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

#ifndef WIN32
#include <netinet/in.h>
#endif /* WIN32 */

#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>

#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ppp.h"
#include "chdlc.h"
#include "ethertype.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.
 */

/* Control Protocols (LCP/IPCP/CCP etc.) Codes */

#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) */
#define CPCODES_TIME_REM	13	/* Time-Remaining (LCP only) */
#define CPCODES_RESET_REQ	14	/* Reset-Request (CCP only) */
#define CPCODES_RESET_REP	15	/* Reset-Reply (CCP only) */

#define CPCODES_MIN	CPCODES_VEXT
#define CPCODES_MAX	CPCODES_RESET_REP

static const char *cpcodes[] = {
	/*
	 * Control Protocol code values (RFC1661)
	 */
	"Vend-Ext",	/* (0) RFC2153 */
	"Conf-Req",	/* (1) */
	"Conf-Ack",	/* (2) */
	"Conf-Nak",	/* (3) */
	"Conf-Rej",	/* (4) */
	"Term-Req",	/* (5) */
	"Term-Ack",	/* (6) */
 	"Code-Rej",	/* (7) */
	"Prot-Rej",	/* (8) */
	"Echo-Req",	/* (9) */
	"Echo-Rep",	/* (10) */
	"Disc-Req",	/* (11) */
	"Ident",	/* (12) RFC1570 */
	"Time-Rem",	/* (13) RFC1570 */
	"Reset-Req",	/* (14) RFC1962 */
	"Reset-Ack",	/* (15) RFC1962 */
};

/* 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) */
	"SSNHF",		/* (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) */
};

/* IPV6CP - to be supported */
/* 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 */

#define CCPOPT_MIN CCPOPT_OUI
#define CCPOPT_MAX CCPOPT_DEFLATE    /* XXX: should be CCPOPT_RESV but... */

static const char *ccpconfopts[] = {
	"OUI",			/* (0) */
	"Pred-1",		/* (1) */
	"Pred-2",		/* (2) */
	"Puddle",		/* (3) */
	"unassigned(4)",	/* (4) */
	"unassigned(5)",	/* (5) */
	"unassigned(6)",	/* (6) */
	"unassigned(7)",	/* (7) */
	"unassigned(8)",	/* (8) */
	"unassigned(9)",	/* (9) */
	"unassigned(10)",	/* (10) */
	"unassigned(11)",	/* (11) */
	"unassigned(12)",	/* (12) */
	"unassigned(13)",	/* (13) */
	"unassigned(14)",	/* (14) */
	"unassigned(15)",	/* (15) */
	"HP-PPC",		/* (16) */
	"Stac-LZS",		/* (17) */
	"MPPC",			/* (18) */
	"Gand-FZA",		/* (19) */
	"V.42bis",		/* (20) */
	"BSD-Comp",		/* (21) */
	"unassigned(22)",	/* (22) */
	"LZS-DCP",		/* (23) */
	"MVRCA",		/* (24) */
	"DEC",			/* (25) */
	"Deflate",		/* (26) */
};

/* BACP Config Options */

#define BACPOPT_FPEER	1	/* RFC2125 */

/* 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 */

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

/* Auth Algorithms */

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

/* 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 */

/* CHAP */

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

#define CHAP_CODEMIN CHAP_CHAL
#define CHAP_CODEMAX CHAP_FAIL

static const char *chapcode[] = {
	"Chal",		/* (1) */
	"Resp",		/* (2) */
	"Succ",		/* (3) */
	"Fail",		/* (4) */
};

/* PAP */

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

#define PAP_CODEMIN	PAP_AREQ
#define PAP_CODEMAX	PAP_ANAK

static const char *papcode[] = {
	"Auth-Req",	/* (1) */
	"Auth-Ack",	/* (2) */
	"Auth-Nak",	/* (3) */
};

/* 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 const char *ppp_protoname (u_int proto);
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 int print_lcp_config_options (const u_char *p, int);
static int print_ipcp_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 const char *
ppp_protoname(u_int proto)
{
	static char buf[20];

	switch (proto) {
	case PPP_IP:	return "IP";
	case PPP_IPV6:	return "IPv6";
#ifdef PPP_XNS
	case PPP_XNS:	return "XNS";
#endif
	case PPP_IPX:	return "IPX";
	case PPP_VJC:	return "VJC";
	case PPP_VJNC:	return "VJNC";
#ifdef PPP_COMP
	case PPP_COMP:	return "COMP";
#endif
	case PPP_IPCP:	return "IPCP";
	case PPP_IPV6CP: return "IPv6CP";
	case PPP_IPXCP:	return "IPXCP";
	case PPP_CCP:	return "CCP";
	case PPP_LCP:	return "LCP";
	case PPP_PAP:	return "PAP";
#ifdef PPP_LQR
	case PPP_LQR:	return "LQR";
#endif
	case PPP_CHAP:	return "CHAP";
	case PPP_BACP:	return "BACP";
	case PPP_BAP:	return "BAP";
	default:
		snprintf(buf, sizeof(buf), "unknown-0x%04x", proto);
		return buf;
	}
}

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

	if (length < 1) {
		printf("[|%s]", ppp_protoname(proto));
		return;
	} else if (length < 4) {
		printf("[|%s 0x%02x]", ppp_protoname(proto), *p);
		return;
	}

	code = *p;
	if ((code >= CPCODES_MIN) && (code <= CPCODES_MAX))
		printf("%s", cpcodes[code]);
	else {
		printf("0x%02x", code);
		return;
	}
	p++;

	printf("(%u)", *p);		/* ID */
	p++;

	len = EXTRACT_16BITS(p);
	p += 2;

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

	switch (code) {
	case CPCODES_VEXT:
		if (length < 11)
			break;
		printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
		p += 4;
		printf(" OUI=%02x%02x%02x", p[0], p[1], p[2]);
		/* 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_CCP:
				pfunc = print_ccp_config_options;
				break;
			case PPP_BACP:
				pfunc = print_bacp_config_options;
				break;
			default:
				/*
				 * This should never happen, but we set
				 * "pfunc" to squelch uninitialized
				 * variable warnings from compilers.
				 */
				pfunc = NULL;
				break;
			}
			if ((j = (*pfunc)(p, len)) == 0)
				break;
			x -= j;
			p += j;
		} while (x > 0);