749 lines
18 KiB
C
749 lines
18 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* \summary: Domain Name System (DNS) printer */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <netdissect-stdinc.h>
|
|
|
|
#include "nameser.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include "netdissect.h"
|
|
#include "addrtoname.h"
|
|
#include "addrtostr.h"
|
|
#include "extract.h"
|
|
|
|
static const char *ns_ops[] = {
|
|
"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
|
|
" op8", " updateA", " updateD", " updateDA",
|
|
" updateM", " updateMA", " zoneInit", " zoneRef",
|
|
};
|
|
|
|
static const char *ns_resp[] = {
|
|
"", " FormErr", " ServFail", " NXDomain",
|
|
" NotImp", " Refused", " YXDomain", " YXRRSet",
|
|
" NXRRSet", " NotAuth", " NotZone", " Resp11",
|
|
" Resp12", " Resp13", " Resp14", " NoChange",
|
|
};
|
|
|
|
/* skip over a domain name */
|
|
static const u_char *
|
|
ns_nskip(netdissect_options *ndo,
|
|
register const u_char *cp)
|
|
{
|
|
register u_char i;
|
|
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return (NULL);
|
|
i = *cp++;
|
|
while (i) {
|
|
if ((i & INDIR_MASK) == INDIR_MASK)
|
|
return (cp + 1);
|
|
if ((i & INDIR_MASK) == EDNS0_MASK) {
|
|
int bitlen, bytelen;
|
|
|
|
if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
|
|
return(NULL); /* unknown ELT */
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return (NULL);
|
|
if ((bitlen = *cp++) == 0)
|
|
bitlen = 256;
|
|
bytelen = (bitlen + 7) / 8;
|
|
cp += bytelen;
|
|
} else
|
|
cp += i;
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return (NULL);
|
|
i = *cp++;
|
|
}
|
|
return (cp);
|
|
}
|
|
|
|
/* print a <domain-name> */
|
|
static const u_char *
|
|
blabel_print(netdissect_options *ndo,
|
|
const u_char *cp)
|
|
{
|
|
int bitlen, slen, b;
|
|
const u_char *bitp, *lim;
|
|
char tc;
|
|
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(NULL);
|
|
if ((bitlen = *cp) == 0)
|
|
bitlen = 256;
|
|
slen = (bitlen + 3) / 4;
|
|
lim = cp + 1 + slen;
|
|
|
|
/* print the bit string as a hex string */
|
|
ND_PRINT((ndo, "\\[x"));
|
|
for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
|
|
ND_TCHECK(*bitp);
|
|
ND_PRINT((ndo, "%02x", *bitp));
|
|
}
|
|
if (b > 4) {
|
|
ND_TCHECK(*bitp);
|
|
tc = *bitp++;
|
|
ND_PRINT((ndo, "%02x", tc & (0xff << (8 - b))));
|
|
} else if (b > 0) {
|
|
ND_TCHECK(*bitp);
|
|
tc = *bitp++;
|
|
ND_PRINT((ndo, "%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b))));
|
|
}
|
|
ND_PRINT((ndo, "/%d]", bitlen));
|
|
return lim;
|
|
trunc:
|
|
ND_PRINT((ndo, ".../%d]", bitlen));
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
labellen(netdissect_options *ndo,
|
|
const u_char *cp)
|
|
{
|
|
register u_int i;
|
|
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(-1);
|
|
i = *cp;
|
|
if ((i & INDIR_MASK) == EDNS0_MASK) {
|
|
int bitlen, elt;
|
|
if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
|
|
ND_PRINT((ndo, "<ELT %d>", elt));
|
|
return(-1);
|
|
}
|
|
if (!ND_TTEST2(*(cp + 1), 1))
|
|
return(-1);
|
|
if ((bitlen = *(cp + 1)) == 0)
|
|
bitlen = 256;
|
|
return(((bitlen + 7) / 8) + 1);
|
|
} else
|
|
return(i);
|
|
}
|
|
|
|
const u_char *
|
|
ns_nprint(netdissect_options *ndo,
|
|
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 = ndo->ndo_snapend - bp;
|
|
|
|
if ((l = labellen(ndo, cp)) == (u_int)-1)
|
|
return(NULL);
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(NULL);
|
|
chars_processed = 1;
|
|
if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
|
|
compress = 0;
|
|
rp = cp + l;
|
|
}
|
|
|
|
if (i != 0)
|
|
while (i && cp < ndo->ndo_snapend) {
|
|
if ((i & INDIR_MASK) == INDIR_MASK) {
|
|
if (!compress) {
|
|
rp = cp + 1;
|
|
compress = 1;
|
|
}
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(NULL);
|
|
cp = bp + (((i << 8) | *cp) & 0x3fff);
|
|
if ((l = labellen(ndo, cp)) == (u_int)-1)
|
|
return(NULL);
|
|
if (!ND_TTEST2(*cp, 1))
|
|
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) {
|
|
ND_PRINT((ndo, "<LOOP>"));
|
|
return (NULL);
|
|
}
|
|
continue;
|
|
}
|
|
if ((i & INDIR_MASK) == EDNS0_MASK) {
|
|
elt = (i & ~INDIR_MASK);
|
|
switch(elt) {
|
|
case EDNS0_ELT_BITLABEL:
|
|
if (blabel_print(ndo, cp) == NULL)
|
|
return (NULL);
|
|
break;
|
|
default:
|
|
/* unknown ELT */
|
|
ND_PRINT((ndo, "<ELT %d>", elt));
|
|
return(NULL);
|
|
}
|
|
} else {
|
|
if (fn_printn(ndo, cp, l, ndo->ndo_snapend))
|
|
return(NULL);
|
|
}
|
|
|
|
cp += l;
|
|
chars_processed += l;
|
|
ND_PRINT((ndo, "."));
|
|
if ((l = labellen(ndo, cp)) == (u_int)-1)
|
|
return(NULL);
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(NULL);
|
|
i = *cp++;
|
|
chars_processed++;
|
|
if (!compress)
|
|
rp += l + 1;
|
|
}
|
|
else
|
|
ND_PRINT((ndo, "."));
|
|
return (rp);
|
|
}
|
|
|
|
/* print a <character-string> */
|
|
static const u_char *
|
|
ns_cprint(netdissect_options *ndo,
|
|
register const u_char *cp)
|
|
{
|
|
register u_int i;
|
|
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return (NULL);
|
|
i = *cp++;
|
|
if (fn_printn(ndo, cp, i, ndo->ndo_snapend))
|
|
return (NULL);
|
|
return (cp + i);
|
|
}
|
|
|
|
/* http://www.iana.org/assignments/dns-parameters */
|
|
const struct tok ns_type2str[] = {
|
|
{ T_A, "A" }, /* RFC 1035 */
|
|
{ T_NS, "NS" }, /* RFC 1035 */
|
|
{ T_MD, "MD" }, /* RFC 1035 */
|
|
{ T_MF, "MF" }, /* RFC 1035 */
|
|
{ T_CNAME, "CNAME" }, /* RFC 1035 */
|
|
{ T_SOA, "SOA" }, /* RFC 1035 */
|
|
{ T_MB, "MB" }, /* RFC 1035 */
|
|
{ T_MG, "MG" }, /* RFC 1035 */
|
|
{ T_MR, "MR" }, /* RFC 1035 */
|
|
{ T_NULL, "NULL" }, /* RFC 1035 */
|
|
{ T_WKS, "WKS" }, /* RFC 1035 */
|
|
{ T_PTR, "PTR" }, /* RFC 1035 */
|
|
{ T_HINFO, "HINFO" }, /* RFC 1035 */
|
|
{ T_MINFO, "MINFO" }, /* RFC 1035 */
|
|
{ T_MX, "MX" }, /* RFC 1035 */
|
|
{ T_TXT, "TXT" }, /* RFC 1035 */
|
|
{ T_RP, "RP" }, /* RFC 1183 */
|
|
{ T_AFSDB, "AFSDB" }, /* RFC 1183 */
|
|
{ T_X25, "X25" }, /* RFC 1183 */
|
|
{ T_ISDN, "ISDN" }, /* RFC 1183 */
|
|
{ T_RT, "RT" }, /* RFC 1183 */
|
|
{ T_NSAP, "NSAP" }, /* RFC 1706 */
|
|
{ T_NSAP_PTR, "NSAP_PTR" },
|
|
{ T_SIG, "SIG" }, /* RFC 2535 */
|
|
{ T_KEY, "KEY" }, /* RFC 2535 */
|
|
{ T_PX, "PX" }, /* RFC 2163 */
|
|
{ T_GPOS, "GPOS" }, /* RFC 1712 */
|
|
{ T_AAAA, "AAAA" }, /* RFC 1886 */
|
|
{ T_LOC, "LOC" }, /* RFC 1876 */
|
|
{ T_NXT, "NXT" }, /* RFC 2535 */
|
|
{ T_EID, "EID" }, /* Nimrod */
|
|
{ T_NIMLOC, "NIMLOC" }, /* Nimrod */
|
|
{ T_SRV, "SRV" }, /* RFC 2782 */
|
|
{ T_ATMA, "ATMA" }, /* ATM Forum */
|
|
{ T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */
|
|
{ T_KX, "KX" }, /* RFC 2230 */
|
|
{ T_CERT, "CERT" }, /* RFC 2538 */
|
|
{ T_A6, "A6" }, /* RFC 2874 */
|
|
{ T_DNAME, "DNAME" }, /* RFC 2672 */
|
|
{ T_SINK, "SINK" },
|
|
{ T_OPT, "OPT" }, /* RFC 2671 */
|
|
{ T_APL, "APL" }, /* RFC 3123 */
|
|
{ T_DS, "DS" }, /* RFC 4034 */
|
|
{ T_SSHFP, "SSHFP" }, /* RFC 4255 */
|
|
{ T_IPSECKEY, "IPSECKEY" }, /* RFC 4025 */
|
|
{ T_RRSIG, "RRSIG" }, /* RFC 4034 */
|
|
{ T_NSEC, "NSEC" }, /* RFC 4034 */
|
|
{ T_DNSKEY, "DNSKEY" }, /* RFC 4034 */
|
|
{ T_SPF, "SPF" }, /* RFC-schlitt-spf-classic-02.txt */
|
|
{ T_UINFO, "UINFO" },
|
|
{ T_UID, "UID" },
|
|
{ T_GID, "GID" },
|
|
{ T_UNSPEC, "UNSPEC" },
|
|
{ T_UNSPECA, "UNSPECA" },
|
|
{ T_TKEY, "TKEY" }, /* RFC 2930 */
|
|
{ T_TSIG, "TSIG" }, /* RFC 2845 */
|
|
{ T_IXFR, "IXFR" }, /* RFC 1995 */
|
|
{ T_AXFR, "AXFR" }, /* RFC 1035 */
|
|
{ T_MAILB, "MAILB" }, /* RFC 1035 */
|
|
{ T_MAILA, "MAILA" }, /* RFC 1035 */
|
|
{ T_ANY, "ANY" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
const struct tok ns_class2str[] = {
|
|
{ C_IN, "IN" }, /* Not used */
|
|
{ C_CHAOS, "CHAOS" },
|
|
{ C_HS, "HS" },
|
|
{ C_ANY, "ANY" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* print a query */
|
|
static const u_char *
|
|
ns_qprint(netdissect_options *ndo,
|
|
register const u_char *cp, register const u_char *bp, int is_mdns)
|
|
{
|
|
register const u_char *np = cp;
|
|
register u_int i, class;
|
|
|
|
cp = ns_nskip(ndo, cp);
|
|
|
|
if (cp == NULL || !ND_TTEST2(*cp, 4))
|
|
return(NULL);
|
|
|
|
/* print the qtype */
|
|
i = EXTRACT_16BITS(cp);
|
|
cp += 2;
|
|
ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", i)));
|
|
/* print the qclass (if it's not IN) */
|
|
i = EXTRACT_16BITS(cp);
|
|
cp += 2;
|
|
if (is_mdns)
|
|
class = (i & ~C_QU);
|
|
else
|
|
class = i;
|
|
if (class != C_IN)
|
|
ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
|
|
if (is_mdns) {
|
|
ND_PRINT((ndo, i & C_QU ? " (QU)" : " (QM)"));
|
|
}
|
|
|
|
ND_PRINT((ndo, "? "));
|
|
cp = ns_nprint(ndo, np, bp);
|
|
return(cp ? cp + 4 : NULL);
|
|
}
|
|
|
|
/* print a reply */
|
|
static const u_char *
|
|
ns_rprint(netdissect_options *ndo,
|
|
register const u_char *cp, register const u_char *bp, int is_mdns)
|
|
{
|
|
register u_int i, class, opt_flags = 0;
|
|
register u_short typ, len;
|
|
register const u_char *rp;
|
|
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, " "));
|
|
if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
|
|
return NULL;
|
|
} else
|
|
cp = ns_nskip(ndo, cp);
|
|
|
|
if (cp == NULL || !ND_TTEST2(*cp, 10))
|
|
return (ndo->ndo_snapend);
|
|
|
|
/* print the type/qtype */
|
|
typ = EXTRACT_16BITS(cp);
|
|
cp += 2;
|
|
/* print the class (if it's not IN and the type isn't OPT) */
|
|
i = EXTRACT_16BITS(cp);
|
|
cp += 2;
|
|
if (is_mdns)
|
|
class = (i & ~C_CACHE_FLUSH);
|
|
else
|
|
class = i;
|
|
if (class != C_IN && typ != T_OPT)
|
|
ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
|
|
if (is_mdns) {
|
|
if (i & C_CACHE_FLUSH)
|
|
ND_PRINT((ndo, " (Cache flush)"));
|
|
}
|
|
|
|
if (typ == T_OPT) {
|
|
/* get opt flags */
|
|
cp += 2;
|
|
opt_flags = EXTRACT_16BITS(cp);
|
|
/* ignore rest of ttl field */
|
|
cp += 2;
|
|
} else if (ndo->ndo_vflag > 2) {
|
|
/* print ttl */
|
|
ND_PRINT((ndo, " ["));
|
|
unsigned_relts_print(ndo, EXTRACT_32BITS(cp));
|
|
ND_PRINT((ndo, "]"));
|
|
cp += 4;
|
|
} else {
|
|
/* ignore ttl */
|
|
cp += 4;
|
|
}
|
|
|
|
len = EXTRACT_16BITS(cp);
|
|
cp += 2;
|
|
|
|
rp = cp + len;
|
|
|
|
ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", typ)));
|
|
if (rp > ndo->ndo_snapend)
|
|
return(NULL);
|
|
|
|
switch (typ) {
|
|
case T_A:
|
|
if (!ND_TTEST2(*cp, sizeof(struct in_addr)))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " %s", intoa(htonl(EXTRACT_32BITS(cp)))));
|
|
break;
|
|
|
|
case T_NS:
|
|
case T_CNAME:
|
|
case T_PTR:
|
|
#ifdef T_DNAME
|
|
case T_DNAME:
|
|
#endif
|
|
ND_PRINT((ndo, " "));
|
|
if (ns_nprint(ndo, cp, bp) == NULL)
|
|
return(NULL);
|
|
break;
|
|
|
|
case T_SOA:
|
|
if (!ndo->ndo_vflag)
|
|
break;
|
|
ND_PRINT((ndo, " "));
|
|
if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
|
|
return(NULL);
|
|
ND_PRINT((ndo, " "));
|
|
if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
|
|
return(NULL);
|
|
if (!ND_TTEST2(*cp, 5 * 4))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
|
|
cp += 4;
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
|
|
cp += 4;
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
|
|
cp += 4;
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
|
|
cp += 4;
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
|
|
cp += 4;
|
|
break;
|
|
case T_MX:
|
|
ND_PRINT((ndo, " "));
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
if (ns_nprint(ndo, cp + 2, bp) == NULL)
|
|
return(NULL);
|
|
ND_PRINT((ndo, " %d", EXTRACT_16BITS(cp)));
|
|
break;
|
|
|
|
case T_TXT:
|
|
while (cp < rp) {
|
|
ND_PRINT((ndo, " \""));
|
|
cp = ns_cprint(ndo, cp);
|
|
if (cp == NULL)
|
|
return(NULL);
|
|
ND_PRINT((ndo, "\""));
|
|
}
|
|
break;
|
|
|
|
case T_SRV:
|
|
ND_PRINT((ndo, " "));
|
|
if (!ND_TTEST2(*cp, 6))
|
|
return(NULL);
|
|
if (ns_nprint(ndo, cp + 6, bp) == NULL)
|
|
return(NULL);
|
|
ND_PRINT((ndo, ":%d %d %d", EXTRACT_16BITS(cp + 4),
|
|
EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2)));
|
|
break;
|
|
|
|
case T_AAAA:
|
|
{
|
|
char ntop_buf[INET6_ADDRSTRLEN];
|
|
|
|
if (!ND_TTEST2(*cp, sizeof(struct in6_addr)))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " %s",
|
|
addrtostr6(cp, ntop_buf, sizeof(ntop_buf))));
|
|
|
|
break;
|
|
}
|
|
|
|
case T_A6:
|
|
{
|
|
struct in6_addr a;
|
|
int pbit, pbyte;
|
|
char ntop_buf[INET6_ADDRSTRLEN];
|
|
|
|
if (!ND_TTEST2(*cp, 1))
|
|
return(NULL);
|
|
pbit = *cp;
|
|
pbyte = (pbit & ~7) / 8;
|
|
if (pbit > 128) {
|
|
ND_PRINT((ndo, " %u(bad plen)", pbit));
|
|
break;
|
|
} else if (pbit < 128) {
|
|
if (!ND_TTEST2(*(cp + 1), sizeof(a) - pbyte))
|
|
return(NULL);
|
|
memset(&a, 0, sizeof(a));
|
|
memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
|
|
ND_PRINT((ndo, " %u %s", pbit,
|
|
addrtostr6(&a, ntop_buf, sizeof(ntop_buf))));
|
|
}
|
|
if (pbit > 0) {
|
|
ND_PRINT((ndo, " "));
|
|
if (ns_nprint(ndo, cp + 1 + sizeof(a) - pbyte, bp) == NULL)
|
|
return(NULL);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case T_OPT:
|
|
ND_PRINT((ndo, " UDPsize=%u", class));
|
|
if (opt_flags & 0x8000)
|
|
ND_PRINT((ndo, " DO"));
|
|
break;
|
|
|
|
case T_UNSPECA: /* One long string */
|
|
if (!ND_TTEST2(*cp, len))
|
|
return(NULL);
|
|
if (fn_printn(ndo, cp, len, ndo->ndo_snapend))
|
|
return(NULL);
|
|
break;
|
|
|
|
case T_TSIG:
|
|
{
|
|
if (cp + len > ndo->ndo_snapend)
|
|
return(NULL);
|
|
if (!ndo->ndo_vflag)
|
|
break;
|
|
ND_PRINT((ndo, " "));
|
|
if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
|
|
return(NULL);
|
|
cp += 6;
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " fudge=%u", EXTRACT_16BITS(cp)));
|
|
cp += 2;
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " maclen=%u", EXTRACT_16BITS(cp)));
|
|
cp += 2 + EXTRACT_16BITS(cp);
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " origid=%u", EXTRACT_16BITS(cp)));
|
|
cp += 2;
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " error=%u", EXTRACT_16BITS(cp)));
|
|
cp += 2;
|
|
if (!ND_TTEST2(*cp, 2))
|
|
return(NULL);
|
|
ND_PRINT((ndo, " otherlen=%u", EXTRACT_16BITS(cp)));
|
|
cp += 2;
|
|
}
|
|
}
|
|
return (rp); /* XXX This isn't always right */
|
|
}
|
|
|
|
void
|
|
ns_print(netdissect_options *ndo,
|
|
register const u_char *bp, u_int length, int is_mdns)
|
|
{
|
|
register const HEADER *np;
|
|
register int qdcount, ancount, nscount, arcount;
|
|
register const u_char *cp;
|
|
uint16_t b2;
|
|
|
|
np = (const HEADER *)bp;
|
|
ND_TCHECK(*np);
|
|
/* get the byte-order right */
|
|
qdcount = EXTRACT_16BITS(&np->qdcount);
|
|
ancount = EXTRACT_16BITS(&np->ancount);
|
|
nscount = EXTRACT_16BITS(&np->nscount);
|
|
arcount = EXTRACT_16BITS(&np->arcount);
|
|
|
|
if (DNS_QR(np)) {
|
|
/* this is a response */
|
|
ND_PRINT((ndo, "%d%s%s%s%s%s%s",
|
|
EXTRACT_16BITS(&np->id),
|
|
ns_ops[DNS_OPCODE(np)],
|
|
ns_resp[DNS_RCODE(np)],
|
|
DNS_AA(np)? "*" : "",
|
|
DNS_RA(np)? "" : "-",
|
|
DNS_TC(np)? "|" : "",
|
|
DNS_AD(np)? "$" : ""));
|
|
|
|
if (qdcount != 1)
|
|
ND_PRINT((ndo, " [%dq]", qdcount));
|
|
/* Print QUESTION section on -vv */
|
|
cp = (const u_char *)(np + 1);
|
|
while (qdcount--) {
|
|
if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
|
|
ND_PRINT((ndo, ","));
|
|
if (ndo->ndo_vflag > 1) {
|
|
ND_PRINT((ndo, " q:"));
|
|
if ((cp = ns_qprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
} else {
|
|
if ((cp = ns_nskip(ndo, cp)) == NULL)
|
|
goto trunc;
|
|
cp += 4; /* skip QTYPE and QCLASS */
|
|
}
|
|
}
|
|
ND_PRINT((ndo, " %d/%d/%d", ancount, nscount, arcount));
|
|
if (ancount--) {
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && ancount--) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (ancount > 0)
|
|
goto trunc;
|
|
/* Print NS and AR sections on -vv */
|
|
if (ndo->ndo_vflag > 1) {
|
|
if (cp < ndo->ndo_snapend && nscount--) {
|
|
ND_PRINT((ndo, " ns:"));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && nscount--) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (nscount > 0)
|
|
goto trunc;
|
|
if (cp < ndo->ndo_snapend && arcount--) {
|
|
ND_PRINT((ndo, " ar:"));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && arcount--) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (arcount > 0)
|
|
goto trunc;
|
|
}
|
|
}
|
|
else {
|
|
/* this is a request */
|
|
ND_PRINT((ndo, "%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
|
|
DNS_RD(np) ? "+" : "",
|
|
DNS_CD(np) ? "%" : ""));
|
|
|
|
/* any weirdness? */
|
|
b2 = EXTRACT_16BITS(((const u_short *)np)+1);
|
|
if (b2 & 0x6cf)
|
|
ND_PRINT((ndo, " [b2&3=0x%x]", b2));
|
|
|
|
if (DNS_OPCODE(np) == IQUERY) {
|
|
if (qdcount)
|
|
ND_PRINT((ndo, " [%dq]", qdcount));
|
|
if (ancount != 1)
|
|
ND_PRINT((ndo, " [%da]", ancount));
|
|
}
|
|
else {
|
|
if (ancount)
|
|
ND_PRINT((ndo, " [%da]", ancount));
|
|
if (qdcount != 1)
|
|
ND_PRINT((ndo, " [%dq]", qdcount));
|
|
}
|
|
if (nscount)
|
|
ND_PRINT((ndo, " [%dn]", nscount));
|
|
if (arcount)
|
|
ND_PRINT((ndo, " [%dau]", arcount));
|
|
|
|
cp = (const u_char *)(np + 1);
|
|
if (qdcount--) {
|
|
cp = ns_qprint(ndo, cp, (const u_char *)np, is_mdns);
|
|
if (!cp)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && qdcount--) {
|
|
cp = ns_qprint(ndo, (const u_char *)cp,
|
|
(const u_char *)np,
|
|
is_mdns);
|
|
if (!cp)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (qdcount > 0)
|
|
goto trunc;
|
|
|
|
/* Print remaining sections on -vv */
|
|
if (ndo->ndo_vflag > 1) {
|
|
if (ancount--) {
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && ancount--) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (ancount > 0)
|
|
goto trunc;
|
|
if (cp < ndo->ndo_snapend && nscount--) {
|
|
ND_PRINT((ndo, " ns:"));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (nscount-- && cp < ndo->ndo_snapend) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (nscount > 0)
|
|
goto trunc;
|
|
if (cp < ndo->ndo_snapend && arcount--) {
|
|
ND_PRINT((ndo, " ar:"));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
while (cp < ndo->ndo_snapend && arcount--) {
|
|
ND_PRINT((ndo, ","));
|
|
if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
|
|
goto trunc;
|
|
}
|
|
}
|
|
if (arcount > 0)
|
|
goto trunc;
|
|
}
|
|
}
|
|
ND_PRINT((ndo, " (%d)", length));
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|domain]"));
|
|
}
|