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      1 /*
      2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  */
     21 
     22 #ifndef lint
     23 static const char rcsid[] _U_ =
     24     "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.89.2.8 2007/02/13 19:19:27 guy Exp $ (LBL)";
     25 #endif
     26 
     27 #ifdef HAVE_CONFIG_H
     28 #include "config.h"
     29 #endif
     30 
     31 #include <tcpdump-stdinc.h>
     32 
     33 #include "nameser.h"
     34 
     35 #include <stdio.h>
     36 #include <string.h>
     37 
     38 #include "interface.h"
     39 #include "addrtoname.h"
     40 #include "extract.h"                    /* must come after interface.h */
     41 
     42 static const char *ns_ops[] = {
     43 	"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
     44 	" op8", " updataA", " updateD", " updateDA",
     45 	" updateM", " updateMA", " zoneInit", " zoneRef",
     46 };
     47 
     48 static const char *ns_resp[] = {
     49 	"", " FormErr", " ServFail", " NXDomain",
     50 	" NotImp", " Refused", " YXDomain", " YXRRSet",
     51 	" NXRRSet", " NotAuth", " NotZone", " Resp11",
     52 	" Resp12", " Resp13", " Resp14", " NoChange",
     53 };
     54 
     55 /* skip over a domain name */
     56 static const u_char *
     57 ns_nskip(register const u_char *cp)
     58 {
     59 	register u_char i;
     60 
     61 	if (!TTEST2(*cp, 1))
     62 		return (NULL);
     63 	i = *cp++;
     64 	while (i) {
     65 		if ((i & INDIR_MASK) == INDIR_MASK)
     66 			return (cp + 1);
     67 		if ((i & INDIR_MASK) == EDNS0_MASK) {
     68 			int bitlen, bytelen;
     69 
     70 			if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
     71 				return(NULL); /* unknown ELT */
     72 			if (!TTEST2(*cp, 1))
     73 				return (NULL);
     74 			if ((bitlen = *cp++) == 0)
     75 				bitlen = 256;
     76 			bytelen = (bitlen + 7) / 8;
     77 			cp += bytelen;
     78 		} else
     79 			cp += i;
     80 		if (!TTEST2(*cp, 1))
     81 			return (NULL);
     82 		i = *cp++;
     83 	}
     84 	return (cp);
     85 }
     86 
     87 /* print a <domain-name> */
     88 static const u_char *
     89 blabel_print(const u_char *cp)
     90 {
     91 	int bitlen, slen, b;
     92 	const u_char *bitp, *lim;
     93 	char tc;
     94 
     95 	if (!TTEST2(*cp, 1))
     96 		return(NULL);
     97 	if ((bitlen = *cp) == 0)
     98 		bitlen = 256;
     99 	slen = (bitlen + 3) / 4;
    100 	lim = cp + 1 + slen;
    101 
    102 	/* print the bit string as a hex string */
    103 	printf("\\[x");
    104 	for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
    105 		TCHECK(*bitp);
    106 		printf("%02x", *bitp);
    107 	}
    108 	if (b > 4) {
    109 		TCHECK(*bitp);
    110 		tc = *bitp++;
    111 		printf("%02x", tc & (0xff << (8 - b)));
    112 	} else if (b > 0) {
    113 		TCHECK(*bitp);
    114 		tc = *bitp++;
    115 		printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
    116 	}
    117 	printf("/%d]", bitlen);
    118 	return lim;
    119 trunc:
    120 	printf(".../%d]", bitlen);
    121 	return NULL;
    122 }
    123 
    124 static int
    125 labellen(const u_char *cp)
    126 {
    127 	register u_int i;
    128 
    129 	if (!TTEST2(*cp, 1))
    130 		return(-1);
    131 	i = *cp;
    132 	if ((i & INDIR_MASK) == EDNS0_MASK) {
    133 		int bitlen, elt;
    134 		if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
    135 			printf("<ELT %d>", elt);
    136 			return(-1);
    137 		}
    138 		if (!TTEST2(*(cp + 1), 1))
    139 			return(-1);
    140 		if ((bitlen = *(cp + 1)) == 0)
    141 			bitlen = 256;
    142 		return(((bitlen + 7) / 8) + 1);
    143 	} else
    144 		return(i);
    145 }
    146 
    147 static const u_char *
    148 ns_nprint(register const u_char *cp, register const u_char *bp)
    149 {
    150 	register u_int i, l;
    151 	register const u_char *rp = NULL;
    152 	register int compress = 0;
    153 	int chars_processed;
    154 	int elt;
    155 	int data_size = snapend - bp;
    156 
    157 	if ((l = labellen(cp)) == (u_int)-1)
    158 		return(NULL);
    159 	if (!TTEST2(*cp, 1))
    160 		return(NULL);
    161 	chars_processed = 1;
    162 	if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
    163 		compress = 0;
    164 		rp = cp + l;
    165 	}
    166 
    167 	if (i != 0)
    168 		while (i && cp < snapend) {
    169 			if ((i & INDIR_MASK) == INDIR_MASK) {
    170 				if (!compress) {
    171 					rp = cp + 1;
    172 					compress = 1;
    173 				}
    174 				if (!TTEST2(*cp, 1))
    175 					return(NULL);
    176 				cp = bp + (((i << 8) | *cp) & 0x3fff);
    177 				if ((l = labellen(cp)) == (u_int)-1)
    178 					return(NULL);
    179 				if (!TTEST2(*cp, 1))
    180 					return(NULL);
    181 				i = *cp++;
    182 				chars_processed++;
    183 
    184 				/*
    185 				 * If we've looked at every character in
    186 				 * the message, this pointer will make
    187 				 * us look at some character again,
    188 				 * which means we're looping.
    189 				 */
    190 				if (chars_processed >= data_size) {
    191 					printf("<LOOP>");
    192 					return (NULL);
    193 				}
    194 				continue;
    195 			}
    196 			if ((i & INDIR_MASK) == EDNS0_MASK) {
    197 				elt = (i & ~INDIR_MASK);
    198 				switch(elt) {
    199 				case EDNS0_ELT_BITLABEL:
    200 					if (blabel_print(cp) == NULL)
    201 						return (NULL);
    202 					break;
    203 				default:
    204 					/* unknown ELT */
    205 					printf("<ELT %d>", elt);
    206 					return(NULL);
    207 				}
    208 			} else {
    209 				if (fn_printn(cp, l, snapend))
    210 					return(NULL);
    211 			}
    212 
    213 			cp += l;
    214 			chars_processed += l;
    215 			putchar('.');
    216 			if ((l = labellen(cp)) == (u_int)-1)
    217 				return(NULL);
    218 			if (!TTEST2(*cp, 1))
    219 				return(NULL);
    220 			i = *cp++;
    221 			chars_processed++;
    222 			if (!compress)
    223 				rp += l + 1;
    224 		}
    225 	else
    226 		putchar('.');
    227 	return (rp);
    228 }
    229 
    230 /* print a <character-string> */
    231 static const u_char *
    232 ns_cprint(register const u_char *cp)
    233 {
    234 	register u_int i;
    235 
    236 	if (!TTEST2(*cp, 1))
    237 		return (NULL);
    238 	i = *cp++;
    239 	if (fn_printn(cp, i, snapend))
    240 		return (NULL);
    241 	return (cp + i);
    242 }
    243 
    244 /* http://www.iana.org/assignments/dns-parameters */
    245 struct tok ns_type2str[] = {
    246 	{ T_A,		"A" },			/* RFC 1035 */
    247 	{ T_NS,		"NS" },			/* RFC 1035 */
    248 	{ T_MD,		"MD" },			/* RFC 1035 */
    249 	{ T_MF,		"MF" },			/* RFC 1035 */
    250 	{ T_CNAME,	"CNAME" },		/* RFC 1035 */
    251 	{ T_SOA,	"SOA" },		/* RFC 1035 */
    252 	{ T_MB,		"MB" },			/* RFC 1035 */
    253 	{ T_MG,		"MG" },			/* RFC 1035 */
    254 	{ T_MR,		"MR" },			/* RFC 1035 */
    255 	{ T_NULL,	"NULL" },		/* RFC 1035 */
    256 	{ T_WKS,	"WKS" },		/* RFC 1035 */
    257 	{ T_PTR,	"PTR" },		/* RFC 1035 */
    258 	{ T_HINFO,	"HINFO" },		/* RFC 1035 */
    259 	{ T_MINFO,	"MINFO" },		/* RFC 1035 */
    260 	{ T_MX,		"MX" },			/* RFC 1035 */
    261 	{ T_TXT,	"TXT" },		/* RFC 1035 */
    262 	{ T_RP,		"RP" },			/* RFC 1183 */
    263 	{ T_AFSDB,	"AFSDB" },		/* RFC 1183 */
    264 	{ T_X25,	"X25" },		/* RFC 1183 */
    265 	{ T_ISDN,	"ISDN" },		/* RFC 1183 */
    266 	{ T_RT,		"RT" },			/* RFC 1183 */
    267 	{ T_NSAP,	"NSAP" },		/* RFC 1706 */
    268 	{ T_NSAP_PTR,	"NSAP_PTR" },
    269 	{ T_SIG,	"SIG" },		/* RFC 2535 */
    270 	{ T_KEY,	"KEY" },		/* RFC 2535 */
    271 	{ T_PX,		"PX" },			/* RFC 2163 */
    272 	{ T_GPOS,	"GPOS" },		/* RFC 1712 */
    273 	{ T_AAAA,	"AAAA" },		/* RFC 1886 */
    274 	{ T_LOC,	"LOC" },		/* RFC 1876 */
    275 	{ T_NXT,	"NXT" },		/* RFC 2535 */
    276 	{ T_EID,	"EID" },		/* Nimrod */
    277 	{ T_NIMLOC,	"NIMLOC" },		/* Nimrod */
    278 	{ T_SRV,	"SRV" },		/* RFC 2782 */
    279 	{ T_ATMA,	"ATMA" },		/* ATM Forum */
    280 	{ T_NAPTR,	"NAPTR" },		/* RFC 2168, RFC 2915 */
    281 	{ T_KX,		"KX" },			/* RFC 2230 */
    282 	{ T_CERT,	"CERT" },		/* RFC 2538 */
    283 	{ T_A6,		"A6" },			/* RFC 2874 */
    284 	{ T_DNAME,	"DNAME" },		/* RFC 2672 */
    285 	{ T_SINK, 	"SINK" },
    286 	{ T_OPT,	"OPT" },		/* RFC 2671 */
    287 	{ T_APL, 	"APL" },		/* RFC 3123 */
    288 	{ T_DS,		"DS" },			/* RFC 4034 */
    289 	{ T_SSHFP,	"SSHFP" },		/* RFC 4255 */
    290 	{ T_IPSECKEY,	"IPSECKEY" },		/* RFC 4025 */
    291 	{ T_RRSIG, 	"RRSIG" },		/* RFC 4034 */
    292 	{ T_NSEC,	"NSEC" },		/* RFC 4034 */
    293 	{ T_DNSKEY,	"DNSKEY" },		/* RFC 4034 */
    294 	{ T_SPF,	"SPF" },		/* RFC-schlitt-spf-classic-02.txt */
    295 	{ T_UINFO,	"UINFO" },
    296 	{ T_UID,	"UID" },
    297 	{ T_GID,	"GID" },
    298 	{ T_UNSPEC,	"UNSPEC" },
    299 	{ T_UNSPECA,	"UNSPECA" },
    300 	{ T_TKEY,	"TKEY" },		/* RFC 2930 */
    301 	{ T_TSIG,	"TSIG" },		/* RFC 2845 */
    302 	{ T_IXFR,	"IXFR" },		/* RFC 1995 */
    303 	{ T_AXFR,	"AXFR" },		/* RFC 1035 */
    304 	{ T_MAILB,	"MAILB" },		/* RFC 1035 */
    305 	{ T_MAILA,	"MAILA" },		/* RFC 1035 */
    306 	{ T_ANY,	"ANY" },
    307 	{ 0,		NULL }
    308 };
    309 
    310 struct tok ns_class2str[] = {
    311 	{ C_IN,		"IN" },		/* Not used */
    312 	{ C_CHAOS,	"CHAOS" },
    313 	{ C_HS,		"HS" },
    314 	{ C_ANY,	"ANY" },
    315 	{ 0,		NULL }
    316 };
    317 
    318 /* print a query */
    319 static const u_char *
    320 ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
    321 {
    322 	register const u_char *np = cp;
    323 	register u_int i, class;
    324 
    325 	cp = ns_nskip(cp);
    326 
    327 	if (cp == NULL || !TTEST2(*cp, 4))
    328 		return(NULL);
    329 
    330 	/* print the qtype */
    331 	i = EXTRACT_16BITS(cp);
    332 	cp += 2;
    333 	printf(" %s", tok2str(ns_type2str, "Type%d", i));
    334 	/* print the qclass (if it's not IN) */
    335 	i = EXTRACT_16BITS(cp);
    336 	cp += 2;
    337 	if (is_mdns)
    338 		class = (i & ~C_QU);
    339 	else
    340 		class = i;
    341 	if (class != C_IN)
    342 		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
    343 	if (is_mdns) {
    344 		if (i & C_QU)
    345 			printf(" (QU)");
    346 		else
    347 			printf(" (QM)");
    348 	}
    349 
    350 	fputs("? ", stdout);
    351 	cp = ns_nprint(np, bp);
    352 	return(cp ? cp + 4 : NULL);
    353 }
    354 
    355 /* print a reply */
    356 static const u_char *
    357 ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
    358 {
    359 	register u_int i, class, opt_flags = 0;
    360 	register u_short typ, len;
    361 	register const u_char *rp;
    362 
    363 	if (vflag) {
    364 		putchar(' ');
    365 		if ((cp = ns_nprint(cp, bp)) == NULL)
    366 			return NULL;
    367 	} else
    368 		cp = ns_nskip(cp);
    369 
    370 	if (cp == NULL || !TTEST2(*cp, 10))
    371 		return (snapend);
    372 
    373 	/* print the type/qtype */
    374 	typ = EXTRACT_16BITS(cp);
    375 	cp += 2;
    376 	/* print the class (if it's not IN and the type isn't OPT) */
    377 	i = EXTRACT_16BITS(cp);
    378 	cp += 2;
    379 	if (is_mdns)
    380 		class = (i & ~C_CACHE_FLUSH);
    381 	else
    382 		class = i;
    383 	if (class != C_IN && typ != T_OPT)
    384 		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
    385 	if (is_mdns) {
    386 		if (i & C_CACHE_FLUSH)
    387 			printf(" (Cache flush)");
    388 	}
    389 
    390 	/* ignore ttl */
    391 	cp += 2;
    392 	/* if T_OPT, save opt_flags */
    393 	if (typ == T_OPT)
    394 		opt_flags = EXTRACT_16BITS(cp);
    395 	/* ignore rest of ttl */
    396 	cp += 2;
    397 
    398 	len = EXTRACT_16BITS(cp);
    399 	cp += 2;
    400 
    401 	rp = cp + len;
    402 
    403 	printf(" %s", tok2str(ns_type2str, "Type%d", typ));
    404 	if (rp > snapend)
    405 		return(NULL);
    406 
    407 	switch (typ) {
    408 	case T_A:
    409 		if (!TTEST2(*cp, sizeof(struct in_addr)))
    410 			return(NULL);
    411 		printf(" %s", ipaddr_string(cp));
    412 		break;
    413 
    414 	case T_NS:
    415 	case T_CNAME:
    416 	case T_PTR:
    417 #ifdef T_DNAME
    418 	case T_DNAME:
    419 #endif
    420 		putchar(' ');
    421 		if (ns_nprint(cp, bp) == NULL)
    422 			return(NULL);
    423 		break;
    424 
    425 	case T_SOA:
    426 		if (!vflag)
    427 			break;
    428 		putchar(' ');
    429 		if ((cp = ns_nprint(cp, bp)) == NULL)
    430 			return(NULL);
    431 		putchar(' ');
    432 		if ((cp = ns_nprint(cp, bp)) == NULL)
    433 			return(NULL);
    434 		if (!TTEST2(*cp, 5 * 4))
    435 			return(NULL);
    436 		printf(" %u", EXTRACT_32BITS(cp));
    437 		cp += 4;
    438 		printf(" %u", EXTRACT_32BITS(cp));
    439 		cp += 4;
    440 		printf(" %u", EXTRACT_32BITS(cp));
    441 		cp += 4;
    442 		printf(" %u", EXTRACT_32BITS(cp));
    443 		cp += 4;
    444 		printf(" %u", EXTRACT_32BITS(cp));
    445 		cp += 4;
    446 		break;
    447 	case T_MX:
    448 		putchar(' ');
    449 		if (!TTEST2(*cp, 2))
    450 			return(NULL);
    451 		if (ns_nprint(cp + 2, bp) == NULL)
    452 			return(NULL);
    453 		printf(" %d", EXTRACT_16BITS(cp));
    454 		break;
    455 
    456 	case T_TXT:
    457 		while (cp < rp) {
    458 			printf(" \"");
    459 			cp = ns_cprint(cp);
    460 			if (cp == NULL)
    461 				return(NULL);
    462 			putchar('"');
    463 		}
    464 		break;
    465 
    466 	case T_SRV:
    467 		putchar(' ');
    468 		if (!TTEST2(*cp, 6))
    469 			return(NULL);
    470 		if (ns_nprint(cp + 6, bp) == NULL)
    471 			return(NULL);
    472 		printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
    473 			EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
    474 		break;
    475 
    476 #ifdef INET6
    477 	case T_AAAA:
    478 		if (!TTEST2(*cp, sizeof(struct in6_addr)))
    479 			return(NULL);
    480 		printf(" %s", ip6addr_string(cp));
    481 		break;
    482 
    483 	case T_A6:
    484 	    {
    485 		struct in6_addr a;
    486 		int pbit, pbyte;
    487 
    488 		if (!TTEST2(*cp, 1))
    489 			return(NULL);
    490 		pbit = *cp;
    491 		pbyte = (pbit & ~7) / 8;
    492 		if (pbit > 128) {
    493 			printf(" %u(bad plen)", pbit);
    494 			break;
    495 		} else if (pbit < 128) {
    496 			if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
    497 				return(NULL);
    498 			memset(&a, 0, sizeof(a));
    499 			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
    500 			printf(" %u %s", pbit, ip6addr_string(&a));
    501 		}
    502 		if (pbit > 0) {
    503 			putchar(' ');
    504 			if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
    505 				return(NULL);
    506 		}
    507 		break;
    508 	    }
    509 #endif /*INET6*/
    510 
    511 	case T_OPT:
    512 		printf(" UDPsize=%u", class);
    513 		if (opt_flags & 0x8000)
    514 			printf(" OK");
    515 		break;
    516 
    517 	case T_UNSPECA:		/* One long string */
    518 		if (!TTEST2(*cp, len))
    519 			return(NULL);
    520 		if (fn_printn(cp, len, snapend))
    521 			return(NULL);
    522 		break;
    523 
    524 	case T_TSIG:
    525 	    {
    526 		if (cp + len > snapend)
    527 			return(NULL);
    528 		if (!vflag)
    529 			break;
    530 		putchar(' ');
    531 		if ((cp = ns_nprint(cp, bp)) == NULL)
    532 			return(NULL);
    533 		cp += 6;
    534 		if (!TTEST2(*cp, 2))
    535 			return(NULL);
    536 		printf(" fudge=%u", EXTRACT_16BITS(cp));
    537 		cp += 2;
    538 		if (!TTEST2(*cp, 2))
    539 			return(NULL);
    540 		printf(" maclen=%u", EXTRACT_16BITS(cp));
    541 		cp += 2 + EXTRACT_16BITS(cp);
    542 		if (!TTEST2(*cp, 2))
    543 			return(NULL);
    544 		printf(" origid=%u", EXTRACT_16BITS(cp));
    545 		cp += 2;
    546 		if (!TTEST2(*cp, 2))
    547 			return(NULL);
    548 		printf(" error=%u", EXTRACT_16BITS(cp));
    549 		cp += 2;
    550 		if (!TTEST2(*cp, 2))
    551 			return(NULL);
    552 		printf(" otherlen=%u", EXTRACT_16BITS(cp));
    553 		cp += 2;
    554 	    }
    555 	}
    556 	return (rp);		/* XXX This isn't always right */
    557 }
    558 
    559 void
    560 ns_print(register const u_char *bp, u_int length, int is_mdns)
    561 {
    562 	register const HEADER *np;
    563 	register int qdcount, ancount, nscount, arcount;
    564 	register const u_char *cp;
    565 	u_int16_t b2;
    566 
    567 	np = (const HEADER *)bp;
    568 	TCHECK(*np);
    569 	/* get the byte-order right */
    570 	qdcount = EXTRACT_16BITS(&np->qdcount);
    571 	ancount = EXTRACT_16BITS(&np->ancount);
    572 	nscount = EXTRACT_16BITS(&np->nscount);
    573 	arcount = EXTRACT_16BITS(&np->arcount);
    574 
    575 	if (DNS_QR(np)) {
    576 		/* this is a response */
    577 		printf("%d%s%s%s%s%s%s",
    578 			EXTRACT_16BITS(&np->id),
    579 			ns_ops[DNS_OPCODE(np)],
    580 			ns_resp[DNS_RCODE(np)],
    581 			DNS_AA(np)? "*" : "",
    582 			DNS_RA(np)? "" : "-",
    583 			DNS_TC(np)? "|" : "",
    584 			DNS_AD(np)? "$" : "");
    585 
    586 		if (qdcount != 1)
    587 			printf(" [%dq]", qdcount);
    588 		/* Print QUESTION section on -vv */
    589 		cp = (const u_char *)(np + 1);
    590 		while (qdcount--) {
    591 			if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
    592 				putchar(',');
    593 			if (vflag > 1) {
    594 				fputs(" q:", stdout);
    595 				if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
    596 					goto trunc;
    597 			} else {
    598 				if ((cp = ns_nskip(cp)) == NULL)
    599 					goto trunc;
    600 				cp += 4;	/* skip QTYPE and QCLASS */
    601 			}
    602 		}
    603 		printf(" %d/%d/%d", ancount, nscount, arcount);
    604 		if (ancount--) {
    605 			if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    606 				goto trunc;
    607 			while (cp < snapend && ancount--) {
    608 				putchar(',');
    609 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    610 					goto trunc;
    611 			}
    612 		}
    613 		if (ancount > 0)
    614 			goto trunc;
    615 		/* Print NS and AR sections on -vv */
    616 		if (vflag > 1) {
    617 			if (cp < snapend && nscount--) {
    618 				fputs(" ns:", stdout);
    619 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    620 					goto trunc;
    621 				while (cp < snapend && nscount--) {
    622 					putchar(',');
    623 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    624 						goto trunc;
    625 				}
    626 			}
    627 			if (nscount > 0)
    628 				goto trunc;
    629 			if (cp < snapend && arcount--) {
    630 				fputs(" ar:", stdout);
    631 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    632 					goto trunc;
    633 				while (cp < snapend && arcount--) {
    634 					putchar(',');
    635 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    636 						goto trunc;
    637 				}
    638 			}
    639 			if (arcount > 0)
    640 				goto trunc;
    641 		}
    642 	}
    643 	else {
    644 		/* this is a request */
    645 		printf("%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
    646 		    DNS_RD(np) ? "+" : "",
    647 		    DNS_CD(np) ? "%" : "");
    648 
    649 		/* any weirdness? */
    650 		b2 = EXTRACT_16BITS(((u_short *)np)+1);
    651 		if (b2 & 0x6cf)
    652 			printf(" [b2&3=0x%x]", b2);
    653 
    654 		if (DNS_OPCODE(np) == IQUERY) {
    655 			if (qdcount)
    656 				printf(" [%dq]", qdcount);
    657 			if (ancount != 1)
    658 				printf(" [%da]", ancount);
    659 		}
    660 		else {
    661 			if (ancount)
    662 				printf(" [%da]", ancount);
    663 			if (qdcount != 1)
    664 				printf(" [%dq]", qdcount);
    665 		}
    666 		if (nscount)
    667 			printf(" [%dn]", nscount);
    668 		if (arcount)
    669 			printf(" [%dau]", arcount);
    670 
    671 		cp = (const u_char *)(np + 1);
    672 		if (qdcount--) {
    673 			cp = ns_qprint(cp, (const u_char *)np, is_mdns);
    674 			if (!cp)
    675 				goto trunc;
    676 			while (cp < snapend && qdcount--) {
    677 				cp = ns_qprint((const u_char *)cp,
    678 					       (const u_char *)np,
    679 					       is_mdns);
    680 				if (!cp)
    681 					goto trunc;
    682 			}
    683 		}
    684 		if (qdcount > 0)
    685 			goto trunc;
    686 
    687 		/* Print remaining sections on -vv */
    688 		if (vflag > 1) {
    689 			if (ancount--) {
    690 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    691 					goto trunc;
    692 				while (cp < snapend && ancount--) {
    693 					putchar(',');
    694 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    695 						goto trunc;
    696 				}
    697 			}
    698 			if (ancount > 0)
    699 				goto trunc;
    700 			if (cp < snapend && nscount--) {
    701 				fputs(" ns:", stdout);
    702 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    703 					goto trunc;
    704 				while (nscount-- && cp < snapend) {
    705 					putchar(',');
    706 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    707 						goto trunc;
    708 				}
    709 			}
    710 			if (nscount > 0)
    711 				goto trunc;
    712 			if (cp < snapend && arcount--) {
    713 				fputs(" ar:", stdout);
    714 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    715 					goto trunc;
    716 				while (cp < snapend && arcount--) {
    717 					putchar(',');
    718 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
    719 						goto trunc;
    720 				}
    721 			}
    722 			if (arcount > 0)
    723 				goto trunc;
    724 		}
    725 	}
    726 	printf(" (%d)", length);
    727 	return;
    728 
    729   trunc:
    730 	printf("[|domain]");
    731 	return;
    732 }
    733