xref: /dragonfly/contrib/tcpdump/print-domain.c (revision 3851e4b8) 
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 1.98 2007-12-09 01:40:32 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 	if (typ == T_OPT) {
391 		/* get opt flags */
392 		cp += 2;
393 		opt_flags = EXTRACT_16BITS(cp);
394 		/* ignore rest of ttl field */
395 		cp += 2;
396 	} else if (vflag > 2) {
397 		/* print ttl */
398 		printf(" [");
399 		relts_print(EXTRACT_32BITS(cp));
400 		printf("]");
401 		cp += 4;
402 	} else {
403 		/* ignore ttl */
404 		cp += 4;
405 	}
406 
407 	len = EXTRACT_16BITS(cp);
408 	cp += 2;
409 
410 	rp = cp + len;
411 
412 	printf(" %s", tok2str(ns_type2str, "Type%d", typ));
413 	if (rp > snapend)
414 		return(NULL);
415 
416 	switch (typ) {
417 	case T_A:
418 		if (!TTEST2(*cp, sizeof(struct in_addr)))
419 			return(NULL);
420 		printf(" %s", intoa(htonl(EXTRACT_32BITS(cp))));
421 		break;
422 
423 	case T_NS:
424 	case T_CNAME:
425 	case T_PTR:
426 #ifdef T_DNAME
427 	case T_DNAME:
428 #endif
429 		putchar(' ');
430 		if (ns_nprint(cp, bp) == NULL)
431 			return(NULL);
432 		break;
433 
434 	case T_SOA:
435 		if (!vflag)
436 			break;
437 		putchar(' ');
438 		if ((cp = ns_nprint(cp, bp)) == NULL)
439 			return(NULL);
440 		putchar(' ');
441 		if ((cp = ns_nprint(cp, bp)) == NULL)
442 			return(NULL);
443 		if (!TTEST2(*cp, 5 * 4))
444 			return(NULL);
445 		printf(" %u", EXTRACT_32BITS(cp));
446 		cp += 4;
447 		printf(" %u", EXTRACT_32BITS(cp));
448 		cp += 4;
449 		printf(" %u", EXTRACT_32BITS(cp));
450 		cp += 4;
451 		printf(" %u", EXTRACT_32BITS(cp));
452 		cp += 4;
453 		printf(" %u", EXTRACT_32BITS(cp));
454 		cp += 4;
455 		break;
456 	case T_MX:
457 		putchar(' ');
458 		if (!TTEST2(*cp, 2))
459 			return(NULL);
460 		if (ns_nprint(cp + 2, bp) == NULL)
461 			return(NULL);
462 		printf(" %d", EXTRACT_16BITS(cp));
463 		break;
464 
465 	case T_TXT:
466 		while (cp < rp) {
467 			printf(" \"");
468 			cp = ns_cprint(cp);
469 			if (cp == NULL)
470 				return(NULL);
471 			putchar('"');
472 		}
473 		break;
474 
475 	case T_SRV:
476 		putchar(' ');
477 		if (!TTEST2(*cp, 6))
478 			return(NULL);
479 		if (ns_nprint(cp + 6, bp) == NULL)
480 			return(NULL);
481 		printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
482 			EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
483 		break;
484 
485 #ifdef INET6
486 	case T_AAAA:
487 	    {
488 		struct in6_addr addr;
489 		char ntop_buf[INET6_ADDRSTRLEN];
490 
491 		if (!TTEST2(*cp, sizeof(struct in6_addr)))
492 			return(NULL);
493 		memcpy(&addr, cp, sizeof(struct in6_addr));
494 		printf(" %s",
495 		    inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf)));
496 
497 		break;
498 	    }
499 
500 	case T_A6:
501 	    {
502 		struct in6_addr a;
503 		int pbit, pbyte;
504 		char ntop_buf[INET6_ADDRSTRLEN];
505 
506 		if (!TTEST2(*cp, 1))
507 			return(NULL);
508 		pbit = *cp;
509 		pbyte = (pbit & ~7) / 8;
510 		if (pbit > 128) {
511 			printf(" %u(bad plen)", pbit);
512 			break;
513 		} else if (pbit < 128) {
514 			if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
515 				return(NULL);
516 			memset(&a, 0, sizeof(a));
517 			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
518 			printf(" %u %s", pbit,
519 			    inet_ntop(AF_INET6, &a, ntop_buf, sizeof(ntop_buf)));
520 		}
521 		if (pbit > 0) {
522 			putchar(' ');
523 			if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
524 				return(NULL);
525 		}
526 		break;
527 	    }
528 #endif /*INET6*/
529 
530 	case T_OPT:
531 		printf(" UDPsize=%u", class);
532 		if (opt_flags & 0x8000)
533 			printf(" OK");
534 		break;
535 
536 	case T_UNSPECA:		/* One long string */
537 		if (!TTEST2(*cp, len))
538 			return(NULL);
539 		if (fn_printn(cp, len, snapend))
540 			return(NULL);
541 		break;
542 
543 	case T_TSIG:
544 	    {
545 		if (cp + len > snapend)
546 			return(NULL);
547 		if (!vflag)
548 			break;
549 		putchar(' ');
550 		if ((cp = ns_nprint(cp, bp)) == NULL)
551 			return(NULL);
552 		cp += 6;
553 		if (!TTEST2(*cp, 2))
554 			return(NULL);
555 		printf(" fudge=%u", EXTRACT_16BITS(cp));
556 		cp += 2;
557 		if (!TTEST2(*cp, 2))
558 			return(NULL);
559 		printf(" maclen=%u", EXTRACT_16BITS(cp));
560 		cp += 2 + EXTRACT_16BITS(cp);
561 		if (!TTEST2(*cp, 2))
562 			return(NULL);
563 		printf(" origid=%u", EXTRACT_16BITS(cp));
564 		cp += 2;
565 		if (!TTEST2(*cp, 2))
566 			return(NULL);
567 		printf(" error=%u", EXTRACT_16BITS(cp));
568 		cp += 2;
569 		if (!TTEST2(*cp, 2))
570 			return(NULL);
571 		printf(" otherlen=%u", EXTRACT_16BITS(cp));
572 		cp += 2;
573 	    }
574 	}
575 	return (rp);		/* XXX This isn't always right */
576 }
577 
578 void
579 ns_print(register const u_char *bp, u_int length, int is_mdns)
580 {
581 	register const HEADER *np;
582 	register int qdcount, ancount, nscount, arcount;
583 	register const u_char *cp;
584 	u_int16_t b2;
585 
586 	np = (const HEADER *)bp;
587 	TCHECK(*np);
588 	/* get the byte-order right */
589 	qdcount = EXTRACT_16BITS(&np->qdcount);
590 	ancount = EXTRACT_16BITS(&np->ancount);
591 	nscount = EXTRACT_16BITS(&np->nscount);
592 	arcount = EXTRACT_16BITS(&np->arcount);
593 
594 	if (DNS_QR(np)) {
595 		/* this is a response */
596 		printf("%d%s%s%s%s%s%s",
597 			EXTRACT_16BITS(&np->id),
598 			ns_ops[DNS_OPCODE(np)],
599 			ns_resp[DNS_RCODE(np)],
600 			DNS_AA(np)? "*" : "",
601 			DNS_RA(np)? "" : "-",
602 			DNS_TC(np)? "|" : "",
603 			DNS_AD(np)? "$" : "");
604 
605 		if (qdcount != 1)
606 			printf(" [%dq]", qdcount);
607 		/* Print QUESTION section on -vv */
608 		cp = (const u_char *)(np + 1);
609 		while (qdcount--) {
610 			if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
611 				putchar(',');
612 			if (vflag > 1) {
613 				fputs(" q:", stdout);
614 				if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
615 					goto trunc;
616 			} else {
617 				if ((cp = ns_nskip(cp)) == NULL)
618 					goto trunc;
619 				cp += 4;	/* skip QTYPE and QCLASS */
620 			}
621 		}
622 		printf(" %d/%d/%d", ancount, nscount, arcount);
623 		if (ancount--) {
624 			if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
625 				goto trunc;
626 			while (cp < snapend && ancount--) {
627 				putchar(',');
628 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
629 					goto trunc;
630 			}
631 		}
632 		if (ancount > 0)
633 			goto trunc;
634 		/* Print NS and AR sections on -vv */
635 		if (vflag > 1) {
636 			if (cp < snapend && nscount--) {
637 				fputs(" ns:", stdout);
638 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
639 					goto trunc;
640 				while (cp < snapend && nscount--) {
641 					putchar(',');
642 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
643 						goto trunc;
644 				}
645 			}
646 			if (nscount > 0)
647 				goto trunc;
648 			if (cp < snapend && arcount--) {
649 				fputs(" ar:", stdout);
650 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
651 					goto trunc;
652 				while (cp < snapend && arcount--) {
653 					putchar(',');
654 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
655 						goto trunc;
656 				}
657 			}
658 			if (arcount > 0)
659 				goto trunc;
660 		}
661 	}
662 	else {
663 		/* this is a request */
664 		printf("%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
665 		    DNS_RD(np) ? "+" : "",
666 		    DNS_CD(np) ? "%" : "");
667 
668 		/* any weirdness? */
669 		b2 = EXTRACT_16BITS(((u_short *)np)+1);
670 		if (b2 & 0x6cf)
671 			printf(" [b2&3=0x%x]", b2);
672 
673 		if (DNS_OPCODE(np) == IQUERY) {
674 			if (qdcount)
675 				printf(" [%dq]", qdcount);
676 			if (ancount != 1)
677 				printf(" [%da]", ancount);
678 		}
679 		else {
680 			if (ancount)
681 				printf(" [%da]", ancount);
682 			if (qdcount != 1)
683 				printf(" [%dq]", qdcount);
684 		}
685 		if (nscount)
686 			printf(" [%dn]", nscount);
687 		if (arcount)
688 			printf(" [%dau]", arcount);
689 
690 		cp = (const u_char *)(np + 1);
691 		if (qdcount--) {
692 			cp = ns_qprint(cp, (const u_char *)np, is_mdns);
693 			if (!cp)
694 				goto trunc;
695 			while (cp < snapend && qdcount--) {
696 				cp = ns_qprint((const u_char *)cp,
697 					       (const u_char *)np,
698 					       is_mdns);
699 				if (!cp)
700 					goto trunc;
701 			}
702 		}
703 		if (qdcount > 0)
704 			goto trunc;
705 
706 		/* Print remaining sections on -vv */
707 		if (vflag > 1) {
708 			if (ancount--) {
709 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
710 					goto trunc;
711 				while (cp < snapend && ancount--) {
712 					putchar(',');
713 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
714 						goto trunc;
715 				}
716 			}
717 			if (ancount > 0)
718 				goto trunc;
719 			if (cp < snapend && nscount--) {
720 				fputs(" ns:", stdout);
721 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
722 					goto trunc;
723 				while (nscount-- && cp < snapend) {
724 					putchar(',');
725 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
726 						goto trunc;
727 				}
728 			}
729 			if (nscount > 0)
730 				goto trunc;
731 			if (cp < snapend && arcount--) {
732 				fputs(" ar:", stdout);
733 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
734 					goto trunc;
735 				while (cp < snapend && arcount--) {
736 					putchar(',');
737 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
738 						goto trunc;
739 				}
740 			}
741 			if (arcount > 0)
742 				goto trunc;
743 		}
744 	}
745 	printf(" (%d)", length);
746 	return;
747 
748   trunc:
749 	printf("[|domain]");
750 	return;
751 }
752