print-domain.c

Windump3.6.2源代码

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.64 2001/01/02 23:24:51 guy Exp $ (LBL)";
#endif

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

#ifndef WIN32
#include <sys/param.h>
#include <sys/time.h>

#include <netinet/in.h>
#else
#include "bittypes.h"
#include "IP6_misc.h"
#endif /* WIN32 */

#ifdef NOERROR
#undef NOERROR					/* Solaris sucks */
#endif
#ifdef NOERROR
#undef T_UNSPEC					/* SINIX does too */
#endif
#include "nameser.h"

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"                    /* must come after interface.h */

/* Compatibility */
#ifndef T_TXT
#define T_TXT		16		/* text strings */
#endif
#ifndef T_RP
#define T_RP		17		/* responsible person */
#endif
#ifndef T_AFSDB
#define T_AFSDB		18		/* AFS cell database */
#endif
#ifndef T_X25
#define T_X25		19		/* X_25 calling address */
#endif
#ifndef T_ISDN
#define T_ISDN		20		/* ISDN calling address */
#endif
#ifndef T_RT
#define T_RT		21		/* router */
#endif
#ifndef T_NSAP
#define T_NSAP		22		/* NSAP address */
#endif
#ifndef T_NSAP_PTR
#define T_NSAP_PTR	23		/* reverse NSAP lookup (deprecated) */
#endif
#ifndef T_SIG
#define T_SIG		24		/* security signature */
#endif
#ifndef T_KEY
#define T_KEY		25		/* security key */
#endif
#ifndef T_PX
#define T_PX		26		/* X.400 mail mapping */
#endif
#ifndef T_GPOS
#define T_GPOS		27		/* geographical position (withdrawn) */
#endif
#ifndef T_AAAA
#define T_AAAA		28		/* IP6 Address */
#endif
#ifndef T_LOC
#define T_LOC		29		/* Location Information */
#endif
#ifndef T_NXT
#define T_NXT		30		/* Next Valid Name in Zone */
#endif
#ifndef T_EID
#define T_EID		31		/* Endpoint identifier */
#endif
#ifndef T_NIMLOC
#define T_NIMLOC	32		/* Nimrod locator */
#endif
#ifndef T_SRV
#define T_SRV		33		/* Server selection */
#endif
#ifndef T_ATMA
#define T_ATMA		34		/* ATM Address */
#endif
#ifndef T_NAPTR
#define T_NAPTR		35		/* Naming Authority PoinTeR */
#endif
#ifndef T_A6
#define T_A6		38		/* IP6 address */
#endif
#ifndef T_DNAME
#define T_DNAME		39		/* non-terminal redirection */
#endif

#ifndef T_OPT
#define T_OPT		41		/* EDNS0 option (meta-RR) */
#endif

#ifndef T_UNSPEC
#define T_UNSPEC	103		/* Unspecified format (binary data) */
#endif
#ifndef T_UNSPECA
#define T_UNSPECA	104		/* "unspecified ascii". Ugly MIT hack */
#endif

#ifndef C_CHAOS
#define C_CHAOS		3		/* for chaos net (MIT) */
#endif
#ifndef C_HS
#define C_HS		4		/* for Hesiod name server (MIT) (XXX) */
#endif

static char *ns_ops[] = {
	"", " inv_q", " stat", " op3", " notify", " op5", " op6", " op7",
	" op8", " updataA", " updateD", " updateDA",
	" updateM", " updateMA", " zoneInit", " zoneRef",
};

static char *ns_resp[] = {
	"", " FormErr", " ServFail", " NXDomain",
	" NotImp", " Refused", " Resp6", " Resp7",
	" Resp8", " Resp9", " Resp10", " Resp11",
	" Resp12", " Resp13", " Resp14", " NoChange",
};

/* skip over a domain name */
static const u_char *
ns_nskip(register const u_char *cp, register const u_char *bp)
{
	register u_char i;

	if (((i = *cp++) & INDIR_MASK) == INDIR_MASK)
		return (cp + 1);
	if (cp >= snapend)
		return(NULL);
	while (i && cp < snapend) {
		if ((i & INDIR_MASK) == EDNS0_MASK) {
			int bitlen, bytelen;

			if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
				return(NULL); /* unknown ELT */
			if ((bitlen = *cp++) == 0)
				bitlen = 256;
			bytelen = (bitlen + 7) / 8;
			cp += bytelen;
		} else
			cp += i;
		if (cp >= snapend)
			return(NULL);
		i = *cp++;
	}
	return (cp);
}

/* print a <domain-name> */
static const u_char *
blabel_print(const u_char *cp)
{
	int bitlen, slen, b;
	int truncated = 0;
	const u_char *bitp, *lim;
	char tc;

	if (cp >= snapend)
		return(NULL);
	if ((bitlen = *cp) == 0)
		bitlen = 256;
	slen = (bitlen + 3) / 4;
	if ((lim = cp + 1 + slen) > snapend) {
		truncated = 1;
		lim = snapend;
	}

	/* print the bit string as a hex string */
	printf("\\[x");
	for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++)
		printf("%02x", *bitp);
	if (bitp == lim)
		printf("...");
	else if (b > 4) {
		tc = *bitp++;
		printf("%02x", tc & (0xff << (8 - b)));
	} else if (b > 0) {
		tc = *bitp++;
		printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
	}
	printf("/%d]", bitlen);

	return(truncated ? NULL : lim);
}

static int
labellen(const u_char *cp)
{
	register u_int i;

	if (cp >= snapend)
		return(-1);
	i = *cp;
	if ((i & INDIR_MASK) == EDNS0_MASK) {
		int bitlen, elt;

		if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL)
			return(-1);
		if (cp + 1 >= snapend)
			return(-1);
		if ((bitlen = *(cp + 1)) == 0)
			bitlen = 256;
		return(((bitlen + 7) / 8) + 1);
	} else
		return(i);
}

static const u_char *
ns_nprint(register const u_char *cp, register const u_char *bp)
{
	register u_int i, l;
	register const u_char *rp = NULL;
	register int compress = 0;
	int chars_processed;
	int elt;
	int data_size = snapend - bp;

	if ((l = labellen(cp)) < 0)
		return(NULL);
	if (cp >= snapend)
		return(NULL);
	chars_processed = 1;
	if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
		compress = 0;
		rp = cp + l;
	}

	if (i != 0)
		while (i && cp < snapend) {
			if ((i & INDIR_MASK) == INDIR_MASK) {
				if (!compress) {
					rp = cp + 1;
					compress = 1;
				}
				cp = bp + (((i << 8) | *cp) & 0x3fff);
				if (cp >= snapend)
					return(NULL);
				if ((l = labellen(cp)) < 0)
					return(NULL);
				i = *cp++;
				chars_processed++;

				/*
				 * If we've looked at every character in
				 * the message, this pointer will make
				 * us look at some character again,
				 * which means we're looping.
				 */
				if (chars_processed >= data_size) {
					printf("<LOOP>");
					return (NULL);
				}
				continue;
			}
			if ((i & INDIR_MASK) == EDNS0_MASK) {
				elt = (i & ~INDIR_MASK);
				switch(elt) {
				case EDNS0_ELT_BITLABEL:
					blabel_print(cp);
					break;
				default:
					/* unknown ELT */
					printf("<ELT %d>", elt);
					return(NULL);
				}
			} else {
				if (fn_printn(cp, l, snapend))
					break;
			}

			cp += l;
			chars_processed += l;
			putchar('.');
			if (cp >= snapend || (l = labellen(cp)) < 0)
				return(NULL);
			i = *cp++;
			chars_processed++;
			if (!compress)
				rp += l + 1;
		}
	else
		putchar('.');
	return (rp);
}

/* print a <character-string> */
static const u_char *
ns_cprint(register const u_char *cp, register const u_char *bp)
{
	register u_int i;

	if (cp >= snapend)
		return NULL;
	i = *cp++;
	(void)fn_printn(cp, i, snapend);
	return (cp + i);
}

static struct tok type2str[] = {
	{ T_A,		"A" },
	{ T_NS,		"NS" },
	{ T_MD,		"MD" },
	{ T_MF,		"MF" },
	{ T_CNAME,	"CNAME" },
	{ T_SOA,	"SOA" },
	{ T_MB,		"MB" },
	{ T_MG,		"MG" },
	{ T_MR,		"MR" },
	{ T_NULL,	"NULL" },
	{ T_WKS,	"WKS" },
	{ T_PTR,	"PTR" },
	{ T_HINFO,	"HINFO" },
	{ T_MINFO,	"MINFO" },
	{ T_MX,		"MX" },
	{ T_TXT,	"TXT" },
	{ T_RP,		"RP" },
	{ T_AFSDB,	"AFSDB" },
	{ T_X25,	"X25" },
	{ T_ISDN,	"ISDN" },
	{ T_RT,		"RT" },
	{ T_NSAP,	"NSAP" },