679 lines
14 KiB
C
679 lines
14 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 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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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.78 2001/10/19 09:00:48 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include "nameser.h"
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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static const char *ns_ops[] = {
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"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
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" op8", " updataA", " updateD", " updateDA",
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" updateM", " updateMA", " zoneInit", " zoneRef",
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};
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static const char *ns_resp[] = {
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"", " FormErr", " ServFail", " NXDomain",
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" NotImp", " Refused", " YXDomain", " YXRRSet",
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" NXRRSet", " NotAuth", " NotZone", " Resp11",
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" Resp12", " Resp13", " Resp14", " NoChange",
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};
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/* skip over a domain name */
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static const u_char *
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ns_nskip(register const u_char *cp, register const u_char *bp)
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{
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register u_char i;
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if (!TTEST2(*cp, 1))
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return (NULL);
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if (((i = *cp++) & INDIR_MASK) == INDIR_MASK)
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return (cp + 1);
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while (i) {
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if ((i & INDIR_MASK) == EDNS0_MASK) {
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int bitlen, bytelen;
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if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
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return(NULL); /* unknown ELT */
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if (!TTEST2(*cp, 1))
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return (NULL);
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if ((bitlen = *cp++) == 0)
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bitlen = 256;
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bytelen = (bitlen + 7) / 8;
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cp += bytelen;
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} else
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cp += i;
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if (!TTEST2(*cp, 1))
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return (NULL);
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i = *cp++;
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}
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return (cp);
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}
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/* print a <domain-name> */
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static const u_char *
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blabel_print(const u_char *cp)
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{
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int bitlen, slen, b;
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int truncated = 0;
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const u_char *bitp, *lim;
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char tc;
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if (!TTEST2(*cp, 1))
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return(NULL);
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if ((bitlen = *cp) == 0)
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bitlen = 256;
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slen = (bitlen + 3) / 4;
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if ((lim = cp + 1 + slen) > snapend) {
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truncated = 1;
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lim = snapend;
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}
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/* print the bit string as a hex string */
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printf("\\[x");
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for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++)
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printf("%02x", *bitp);
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if (bitp == lim)
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printf("...");
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else if (b > 4) {
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tc = *bitp++;
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printf("%02x", tc & (0xff << (8 - b)));
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} else if (b > 0) {
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tc = *bitp++;
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printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
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}
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printf("/%d]", bitlen);
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return(truncated ? NULL : lim);
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}
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static int
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labellen(const u_char *cp)
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{
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register u_int i;
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if (!TTEST2(*cp, 1))
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return(-1);
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i = *cp;
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if ((i & INDIR_MASK) == EDNS0_MASK) {
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int bitlen, elt;
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if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL)
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return(-1);
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if (!TTEST2(*(cp + 1), 1))
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return(-1);
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if ((bitlen = *(cp + 1)) == 0)
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bitlen = 256;
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return(((bitlen + 7) / 8) + 1);
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} else
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return(i);
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}
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static const u_char *
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ns_nprint(register const u_char *cp, register const u_char *bp)
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{
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register u_int i, l;
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register const u_char *rp = NULL;
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register int compress = 0;
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int chars_processed;
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int elt;
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int data_size = snapend - bp;
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if ((l = labellen(cp)) < 0)
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return(NULL);
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if (!TTEST2(*cp, 1))
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return(NULL);
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chars_processed = 1;
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if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
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compress = 0;
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rp = cp + l;
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}
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if (i != 0)
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while (i && cp < snapend) {
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if ((i & INDIR_MASK) == INDIR_MASK) {
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if (!compress) {
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rp = cp + 1;
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compress = 1;
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}
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if (!TTEST2(*cp, 1))
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return(NULL);
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cp = bp + (((i << 8) | *cp) & 0x3fff);
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if ((l = labellen(cp)) < 0)
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return(NULL);
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if (!TTEST2(*cp, 1))
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return(NULL);
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i = *cp++;
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chars_processed++;
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/*
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* If we've looked at every character in
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* the message, this pointer will make
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* us look at some character again,
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* which means we're looping.
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*/
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if (chars_processed >= data_size) {
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printf("<LOOP>");
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return (NULL);
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}
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continue;
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}
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if ((i & INDIR_MASK) == EDNS0_MASK) {
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elt = (i & ~INDIR_MASK);
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switch(elt) {
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case EDNS0_ELT_BITLABEL:
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if (blabel_print(cp) == NULL)
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return (NULL);
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break;
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default:
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/* unknown ELT */
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printf("<ELT %d>", elt);
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return(NULL);
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}
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} else {
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if (fn_printn(cp, l, snapend))
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return(NULL);
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}
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cp += l;
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chars_processed += l;
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putchar('.');
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if ((l = labellen(cp)) < 0)
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return(NULL);
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if (!TTEST2(*cp, 1))
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return(NULL);
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i = *cp++;
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chars_processed++;
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if (!compress)
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rp += l + 1;
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}
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else
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putchar('.');
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return (rp);
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}
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/* print a <character-string> */
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static const u_char *
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ns_cprint(register const u_char *cp, register const u_char *bp)
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{
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register u_int i;
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if (!TTEST2(*cp, 1))
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return (NULL);
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i = *cp++;
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if (fn_printn(cp, i, snapend))
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return (NULL);
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return (cp + i);
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}
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struct tok ns_type2str[] = {
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{ T_A, "A" },
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{ T_NS, "NS" },
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{ T_MD, "MD" },
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{ T_MF, "MF" },
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{ T_CNAME, "CNAME" },
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{ T_SOA, "SOA" },
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{ T_MB, "MB" },
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{ T_MG, "MG" },
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{ T_MR, "MR" },
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{ T_NULL, "NULL" },
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{ T_WKS, "WKS" },
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{ T_PTR, "PTR" },
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{ T_HINFO, "HINFO" },
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{ T_MINFO, "MINFO" },
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{ T_MX, "MX" },
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{ T_TXT, "TXT" },
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{ T_RP, "RP" },
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{ T_AFSDB, "AFSDB" },
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{ T_X25, "X25" },
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{ T_ISDN, "ISDN" },
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{ T_RT, "RT" },
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{ T_NSAP, "NSAP" },
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{ T_NSAP_PTR, "NSAP_PTR" },
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{ T_SIG, "SIG" },
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{ T_KEY, "KEY" },
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{ T_PX, "PX" },
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{ T_GPOS, "GPOS" },
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{ T_AAAA, "AAAA" },
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{ T_LOC, "LOC" },
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{ T_NXT, "NXT" },
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{ T_EID, "EID" },
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{ T_NIMLOC, "NIMLOC" },
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{ T_SRV, "SRV" },
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{ T_ATMA, "ATMA" },
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{ T_NAPTR, "NAPTR" },
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{ T_A6, "A6" },
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{ T_DNAME, "DNAME" },
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{ T_OPT, "OPT" },
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{ T_UINFO, "UINFO" },
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{ T_UID, "UID" },
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{ T_GID, "GID" },
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{ T_UNSPEC, "UNSPEC" },
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{ T_UNSPECA, "UNSPECA" },
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{ T_TKEY, "TKEY" },
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{ T_TSIG, "TSIG" },
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{ T_IXFR, "IXFR" },
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{ T_AXFR, "AXFR" },
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{ T_MAILB, "MAILB" },
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{ T_MAILA, "MAILA" },
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{ T_ANY, "ANY" },
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{ 0, NULL }
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};
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struct tok ns_class2str[] = {
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{ C_IN, "IN" }, /* Not used */
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{ C_CHAOS, "CHAOS" },
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{ C_HS, "HS" },
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{ C_ANY, "ANY" },
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{ 0, NULL }
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};
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/* print a query */
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static const u_char *
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ns_qprint(register const u_char *cp, register const u_char *bp)
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{
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register const u_char *np = cp;
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register u_int i;
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cp = ns_nskip(cp, bp);
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if (cp == NULL || !TTEST2(*cp, 4))
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return(NULL);
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/* print the qtype and qclass (if it's not IN) */
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i = *cp++ << 8;
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i |= *cp++;
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printf(" %s", tok2str(ns_type2str, "Type%d", i));
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i = *cp++ << 8;
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i |= *cp++;
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if (i != C_IN)
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printf(" %s", tok2str(ns_class2str, "(Class %d)", i));
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fputs("? ", stdout);
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cp = ns_nprint(np, bp);
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return(cp ? cp + 4 : NULL);
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}
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/* print a reply */
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static const u_char *
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ns_rprint(register const u_char *cp, register const u_char *bp)
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{
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register u_int class;
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register u_short typ, len;
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register const u_char *rp;
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if (vflag) {
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putchar(' ');
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if ((cp = ns_nprint(cp, bp)) == NULL)
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return NULL;
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} else
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cp = ns_nskip(cp, bp);
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if (cp == NULL || !TTEST2(*cp, 10))
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return (snapend);
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/* print the type/qtype and class (if it's not IN) */
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typ = *cp++ << 8;
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typ |= *cp++;
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class = *cp++ << 8;
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class |= *cp++;
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if (class != C_IN && typ != T_OPT)
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printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
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/* ignore ttl */
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cp += 4;
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len = *cp++ << 8;
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len |= *cp++;
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rp = cp + len;
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printf(" %s", tok2str(ns_type2str, "Type%d", typ));
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if (rp > snapend)
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return(NULL);
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switch (typ) {
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case T_A:
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if (!TTEST2(*cp, sizeof(struct in_addr)))
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return(NULL);
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printf(" %s", ipaddr_string(cp));
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break;
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case T_NS:
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case T_CNAME:
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case T_PTR:
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#ifdef T_DNAME
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case T_DNAME:
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#endif
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putchar(' ');
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if (ns_nprint(cp, bp) == NULL)
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return(NULL);
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break;
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case T_SOA:
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if (!vflag)
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break;
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putchar(' ');
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if ((cp = ns_nprint(cp, bp)) == NULL)
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return(NULL);
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putchar(' ');
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if ((cp = ns_nprint(cp, bp)) == NULL)
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return(NULL);
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if (!TTEST2(*cp, 5 * 4))
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return(NULL);
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printf(" %u", EXTRACT_32BITS(cp));
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cp += 4;
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printf(" %u", EXTRACT_32BITS(cp));
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cp += 4;
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printf(" %u", EXTRACT_32BITS(cp));
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cp += 4;
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printf(" %u", EXTRACT_32BITS(cp));
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cp += 4;
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printf(" %u", EXTRACT_32BITS(cp));
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cp += 4;
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break;
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case T_MX:
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putchar(' ');
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if (!TTEST2(*cp, 2))
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return(NULL);
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if (ns_nprint(cp + 2, bp) == NULL)
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return(NULL);
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printf(" %d", EXTRACT_16BITS(cp));
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break;
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case T_TXT:
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putchar(' ');
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(void)ns_cprint(cp, bp);
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break;
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#ifdef INET6
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case T_AAAA:
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if (!TTEST2(*cp, sizeof(struct in6_addr)))
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return(NULL);
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printf(" %s", ip6addr_string(cp));
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break;
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case T_A6:
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{
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struct in6_addr a;
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int pbit, pbyte;
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if (!TTEST2(*cp, 1))
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return(NULL);
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pbit = *cp;
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pbyte = (pbit & ~7) / 8;
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if (pbit > 128) {
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printf(" %u(bad plen)", pbit);
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break;
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} else if (pbit < 128) {
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if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
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return(NULL);
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memset(&a, 0, sizeof(a));
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memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
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printf(" %u %s", pbit, ip6addr_string(&a));
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}
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if (pbit > 0) {
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putchar(' ');
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if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
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return(NULL);
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}
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break;
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}
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#endif /*INET6*/
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case T_OPT:
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printf(" UDPsize=%u", class);
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break;
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case T_UNSPECA: /* One long string */
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if (!TTEST2(*cp, len))
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return(NULL);
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if (fn_printn(cp, len, snapend))
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return(NULL);
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break;
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case T_TSIG:
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{
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if (cp + len > snapend)
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return(NULL);
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if (!vflag)
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break;
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putchar(' ');
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if ((cp = ns_nprint(cp, bp)) == NULL)
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return(NULL);
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cp += 6;
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if (!TTEST2(*cp, 2))
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return(NULL);
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printf(" fudge=%u", EXTRACT_16BITS(cp));
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cp += 2;
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if (!TTEST2(*cp, 2))
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return(NULL);
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printf(" maclen=%u", EXTRACT_16BITS(cp));
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cp += 2 + EXTRACT_16BITS(cp);
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if (!TTEST2(*cp, 2))
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return(NULL);
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printf(" origid=%u", EXTRACT_16BITS(cp));
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cp += 2;
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if (!TTEST2(*cp, 2))
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return(NULL);
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printf(" error=%u", EXTRACT_16BITS(cp));
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cp += 2;
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if (!TTEST2(*cp, 2))
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return(NULL);
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printf(" otherlen=%u", EXTRACT_16BITS(cp));
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cp += 2;
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}
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}
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return (rp); /* XXX This isn't always right */
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}
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void
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ns_print(register const u_char *bp, u_int length)
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{
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register const HEADER *np;
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register int qdcount, ancount, nscount, arcount;
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register const u_char *cp;
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np = (const HEADER *)bp;
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TCHECK(*np);
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/* get the byte-order right */
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qdcount = ntohs(np->qdcount);
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ancount = ntohs(np->ancount);
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nscount = ntohs(np->nscount);
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arcount = ntohs(np->arcount);
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if (DNS_QR(np)) {
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/* this is a response */
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printf(" %d%s%s%s%s%s%s",
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ntohs(np->id),
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ns_ops[DNS_OPCODE(np)],
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ns_resp[DNS_RCODE(np)],
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DNS_AA(np)? "*" : "",
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DNS_RA(np)? "" : "-",
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DNS_TC(np)? "|" : "",
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DNS_CD(np)? "%" : "");
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|
if (qdcount != 1)
|
|
printf(" [%dq]", qdcount);
|
|
/* Print QUESTION section on -vv */
|
|
cp = (const u_char *)(np + 1);
|
|
while (qdcount--) {
|
|
if (qdcount < ntohs(np->qdcount) - 1)
|
|
putchar(',');
|
|
if (vflag > 1) {
|
|
fputs(" q:", stdout);
|
|
if ((cp = ns_qprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
} else {
|
|
if ((cp = ns_nskip(cp, bp)) == NULL)
|
|
goto trunc;
|
|
cp += 4; /* skip QTYPE and QCLASS */
|
|
}
|
|
}
|
|
printf(" %d/%d/%d", ancount, nscount, arcount);
|
|
if (ancount--) {
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (cp < snapend && ancount--) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (ancount > 0)
|
|
goto trunc;
|
|
/* Print NS and AR sections on -vv */
|
|
if (vflag > 1) {
|
|
if (cp < snapend && nscount--) {
|
|
fputs(" ns:", stdout);
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (cp < snapend && nscount--) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (nscount > 0)
|
|
goto trunc;
|
|
if (cp < snapend && arcount--) {
|
|
fputs(" ar:", stdout);
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (cp < snapend && arcount--) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (arcount > 0)
|
|
goto trunc;
|
|
}
|
|
}
|
|
else {
|
|
/* this is a request */
|
|
printf(" %d%s%s%s", ntohs(np->id), ns_ops[DNS_OPCODE(np)],
|
|
DNS_RD(np) ? "+" : "",
|
|
DNS_AD(np) ? "$" : "");
|
|
|
|
/* any weirdness? */
|
|
if (*(((u_short *)np)+1) & htons(0x6cf))
|
|
printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1)));
|
|
|
|
if (DNS_OPCODE(np) == IQUERY) {
|
|
if (qdcount)
|
|
printf(" [%dq]", qdcount);
|
|
if (ancount != 1)
|
|
printf(" [%da]", ancount);
|
|
}
|
|
else {
|
|
if (ancount)
|
|
printf(" [%da]", ancount);
|
|
if (qdcount != 1)
|
|
printf(" [%dq]", qdcount);
|
|
}
|
|
if (nscount)
|
|
printf(" [%dn]", nscount);
|
|
if (arcount)
|
|
printf(" [%dau]", arcount);
|
|
|
|
cp = (const u_char *)(np + 1);
|
|
if (qdcount--) {
|
|
cp = ns_qprint(cp, (const u_char *)np);
|
|
if (!cp)
|
|
goto trunc;
|
|
while (cp < snapend && qdcount--) {
|
|
cp = ns_qprint((const u_char *)cp,
|
|
(const u_char *)np);
|
|
if (!cp)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (qdcount > 0)
|
|
goto trunc;
|
|
|
|
/* Print remaining sections on -vv */
|
|
if (vflag > 1) {
|
|
if (ancount--) {
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (cp < snapend && ancount--) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (ancount > 0)
|
|
goto trunc;
|
|
if (cp < snapend && nscount--) {
|
|
fputs(" ns:", stdout);
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (nscount-- && cp < snapend) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (nscount > 0)
|
|
goto trunc;
|
|
if (cp < snapend && arcount--) {
|
|
fputs(" ar:", stdout);
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
while (cp < snapend && arcount--) {
|
|
putchar(',');
|
|
if ((cp = ns_rprint(cp, bp)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (arcount > 0)
|
|
goto trunc;
|
|
}
|
|
}
|
|
printf(" (%d)", length);
|
|
return;
|
|
|
|
trunc:
|
|
printf("[|domain]");
|
|
return;
|
|
}
|