xref: /openbsd/usr.sbin/tcpdump/print-domain.c (revision 898184e3) 
1 /*	$OpenBSD: print-domain.c,v 1.18 2010/11/04 17:37:05 canacar Exp $	*/
2 
3 /*
4  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that: (1) source code distributions
9  * retain the above copyright notice and this paragraph in its entirety, (2)
10  * distributions including binary code include the above copyright notice and
11  * this paragraph in its entirety in the documentation or other materials
12  * provided with the distribution, and (3) all advertising materials mentioning
13  * features or use of this software display the following acknowledgement:
14  * ``This product includes software developed by the University of California,
15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16  * the University nor the names of its contributors may be used to endorse
17  * or promote products derived from this software without specific prior
18  * written permission.
19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22  */
23 
24 #include <sys/param.h>
25 #include <sys/time.h>
26 #include <sys/socket.h>
27 
28 #include <net/if.h>
29 
30 #include <netinet/in.h>
31 #include <netinet/if_ether.h>
32 #include <netinet/in_systm.h>
33 #include <netinet/ip.h>
34 #include <netinet/ip_var.h>
35 #include <netinet/udp.h>
36 #include <netinet/udp_var.h>
37 #include <netinet/tcp.h>
38 
39 #ifdef NOERROR
40 #undef NOERROR					/* Solaris sucks */
41 #endif
42 #ifdef NOERROR
43 #undef T_UNSPEC					/* SINIX does too */
44 #endif
45 #include "nameser.h"
46 
47 #include <stdio.h>
48 #include <string.h>
49 
50 #include "interface.h"
51 #include "addrtoname.h"
52 #include "extract.h"                    /* must come after interface.h */
53 
54 static const char *ns_ops[] = {
55 	"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
56 	" op8", " updataA", " updateD", " updateDA",
57 	" updateM", " updateMA", " zoneInit", " zoneRef",
58 };
59 
60 static const char *ns_resp[] = {
61 	"", " FormErr", " ServFail", " NXDomain",
62 	" NotImp", " Refused", " YXDomain", " YXRRSet",
63 	" NXRRSet", " NotAuth", " NotZone", " Resp11",
64 	" Resp12", " Resp13", " Resp14", " NoChange",
65 };
66 
67 /* skip over a domain name */
68 static const u_char *
69 ns_nskip(register const u_char *cp)
70 {
71 	register u_char i;
72 
73 	if (!TTEST2(*cp, 1))
74 		return (NULL);
75 	i = *cp++;
76 	while (i) {
77 		if ((i & INDIR_MASK) == INDIR_MASK)
78 			return (cp + 1);
79 		if ((i & INDIR_MASK) == EDNS0_MASK) {
80 			int bitlen, bytelen;
81 
82 			if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
83 				return(NULL); /* unknown ELT */
84 			if (!TTEST2(*cp, 1))
85 				return (NULL);
86 			if ((bitlen = *cp++) == 0)
87 				bitlen = 256;
88 			bytelen = (bitlen + 7) / 8;
89 			cp += bytelen;
90 		} else
91 			cp += i;
92 		if (!TTEST2(*cp, 1))
93 			return (NULL);
94 		i = *cp++;
95 	}
96 	return (cp);
97 }
98 
99 /* print a <domain-name> */
100 static const u_char *
101 blabel_print(const u_char *cp)
102 {
103 	int bitlen, slen, b;
104 	const u_char *bitp, *lim;
105 	char tc;
106 
107 	if (!TTEST2(*cp, 1))
108 		return(NULL);
109 	if ((bitlen = *cp) == 0)
110 		bitlen = 256;
111 	slen = (bitlen + 3) / 4;
112 	lim = cp + 1 + slen;
113 
114 	/* print the bit string as a hex string */
115 	printf("\\[x");
116 	for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
117 		TCHECK(*bitp);
118 		printf("%02x", *bitp);
119 	}
120 	if (b > 4) {
121 		TCHECK(*bitp);
122 		tc = *bitp++;
123 		printf("%02x", tc & (0xff << (8 - b)));
124 	} else if (b > 0) {
125 		TCHECK(*bitp);
126 		tc = *bitp++;
127 		printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
128 	}
129 	printf("/%d]", bitlen);
130 	return lim;
131 trunc:
132 	printf(".../%d]", bitlen);
133 	return NULL;
134 }
135 
136 static int
137 labellen(const u_char *cp)
138 {
139 	register u_int i;
140 
141 	if (!TTEST2(*cp, 1))
142 		return(-1);
143 	i = *cp;
144 	if ((i & INDIR_MASK) == EDNS0_MASK) {
145 		int bitlen, elt;
146 		if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
147 			printf("<ELT %d>", elt);
148 			return(-1);
149 		}
150 		if (!TTEST2(*(cp + 1), 1))
151 			return(-1);
152 		if ((bitlen = *(cp + 1)) == 0)
153 			bitlen = 256;
154 		return(((bitlen + 7) / 8) + 1);
155 	} else
156 		return(i);
157 }
158 
159 static const u_char *
160 ns_nprint(register const u_char *cp, register const u_char *bp)
161 {
162 	register u_int i, l;
163 	register const u_char *rp = NULL;
164 	register int compress = 0;
165 	int chars_processed;
166 	int elt;
167 	int data_size = snapend - bp;
168 
169 	if ((l = labellen(cp)) == (u_int)-1)
170 		return(NULL);
171 	if (!TTEST2(*cp, 1))
172 		return(NULL);
173 	chars_processed = 1;
174 	if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
175 		compress = 0;
176 		rp = cp + l;
177 	}
178 
179 	if (i != 0)
180 		while (i && cp < snapend) {
181 			if ((i & INDIR_MASK) == INDIR_MASK) {
182 				if (!compress) {
183 					rp = cp + 1;
184 					compress = 1;
185 				}
186 				if (!TTEST2(*cp, 1))
187 					return(NULL);
188 				cp = bp + (((i << 8) | *cp) & 0x3fff);
189 				if ((l = labellen(cp)) == (u_int)-1)
190 					return(NULL);
191 				if (!TTEST2(*cp, 1))
192 					return(NULL);
193 				i = *cp++;
194 				chars_processed++;
195 
196 				/*
197 				 * If we've looked at every character in
198 				 * the message, this pointer will make
199 				 * us look at some character again,
200 				 * which means we're looping.
201 				 */
202 				if (chars_processed >= data_size) {
203 					printf("<LOOP>");
204 					return (NULL);
205 				}
206 				continue;
207 			}
208 			if ((i & INDIR_MASK) == EDNS0_MASK) {
209 				elt = (i & ~INDIR_MASK);
210 				switch(elt) {
211 				case EDNS0_ELT_BITLABEL:
212 					if (blabel_print(cp) == NULL)
213 						return (NULL);
214 					break;
215 				default:
216 					/* unknown ELT */
217 					printf("<ELT %d>", elt);
218 					return(NULL);
219 				}
220 			} else {
221 				if (fn_printn(cp, l, snapend))
222 					return(NULL);
223 			}
224 
225 			cp += l;
226 			chars_processed += l;
227 			putchar('.');
228 			if ((l = labellen(cp)) == (u_int)-1)
229 				return(NULL);
230 			if (!TTEST2(*cp, 1))
231 				return(NULL);
232 			i = *cp++;
233 			chars_processed++;
234 			if (!compress)
235 				rp += l + 1;
236 		}
237 	else
238 		putchar('.');
239 	return (rp);
240 }
241 
242 /* print a <character-string> */
243 static const u_char *
244 ns_cprint(register const u_char *cp)
245 {
246 	register u_int i;
247 
248 	if (!TTEST2(*cp, 1))
249 		return (NULL);
250 	i = *cp++;
251 	if (fn_printn(cp, i, snapend))
252 		return (NULL);
253 	return (cp + i);
254 }
255 
256 /* http://www.iana.org/assignments/dns-parameters */
257 struct tok ns_type2str[] = {
258 	{ T_A,		"A" },			/* RFC 1035 */
259 	{ T_NS,		"NS" },			/* RFC 1035 */
260 	{ T_MD,		"MD" },			/* RFC 1035 */
261 	{ T_MF,		"MF" },			/* RFC 1035 */
262 	{ T_CNAME,	"CNAME" },		/* RFC 1035 */
263 	{ T_SOA,	"SOA" },		/* RFC 1035 */
264 	{ T_MB,		"MB" },			/* RFC 1035 */
265 	{ T_MG,		"MG" },			/* RFC 1035 */
266 	{ T_MR,		"MR" },			/* RFC 1035 */
267 	{ T_NULL,	"NULL" },		/* RFC 1035 */
268 	{ T_WKS,	"WKS" },		/* RFC 1035 */
269 	{ T_PTR,	"PTR" },		/* RFC 1035 */
270 	{ T_HINFO,	"HINFO" },		/* RFC 1035 */
271 	{ T_MINFO,	"MINFO" },		/* RFC 1035 */
272 	{ T_MX,		"MX" },			/* RFC 1035 */
273 	{ T_TXT,	"TXT" },		/* RFC 1035 */
274 	{ T_RP,		"RP" },			/* RFC 1183 */
275 	{ T_AFSDB,	"AFSDB" },		/* RFC 1183 */
276 	{ T_X25,	"X25" },		/* RFC 1183 */
277 	{ T_ISDN,	"ISDN" },		/* RFC 1183 */
278 	{ T_RT,		"RT" },			/* RFC 1183 */
279 	{ T_NSAP,	"NSAP" },		/* RFC 1706 */
280 	{ T_NSAP_PTR,	"NSAP_PTR" },
281 	{ T_SIG,	"SIG" },		/* RFC 2535 */
282 	{ T_KEY,	"KEY" },		/* RFC 2535 */
283 	{ T_PX,		"PX" },			/* RFC 2163 */
284 	{ T_GPOS,	"GPOS" },		/* RFC 1712 */
285 	{ T_AAAA,	"AAAA" },		/* RFC 1886 */
286 	{ T_LOC,	"LOC" },		/* RFC 1876 */
287 	{ T_NXT,	"NXT" },		/* RFC 2535 */
288 	{ T_EID,	"EID" },		/* Nimrod */
289 	{ T_NIMLOC,	"NIMLOC" },		/* Nimrod */
290 	{ T_SRV,	"SRV" },		/* RFC 2782 */
291 	{ T_ATMA,	"ATMA" },		/* ATM Forum */
292 	{ T_NAPTR,	"NAPTR" },		/* RFC 2168, RFC 2915 */
293 	{ T_KX,		"KX" },			/* RFC 2230 */
294 	{ T_CERT,	"CERT" },		/* RFC 2538 */
295 	{ T_A6,		"A6" },			/* RFC 2874 */
296 	{ T_DNAME,	"DNAME" },		/* RFC 2672 */
297 	{ T_SINK, 	"SINK" },
298 	{ T_OPT,	"OPT" },		/* RFC 2671 */
299 	{ T_APL, 	"APL" },		/* RFC 3123 */
300 	{ T_DS,		"DS" },			/* RFC 4034 */
301 	{ T_SSHFP,	"SSHFP" },		/* RFC 4255 */
302 	{ T_IPSECKEY,	"IPSECKEY" },		/* RFC 4025 */
303 	{ T_RRSIG, 	"RRSIG" },		/* RFC 4034 */
304 	{ T_NSEC,	"NSEC" },		/* RFC 4034 */
305 	{ T_DNSKEY,	"DNSKEY" },		/* RFC 4034 */
306 	{ T_SPF,	"SPF" },		/* RFC-schlitt-spf-classic-02.txt */
307 	{ T_UINFO,	"UINFO" },
308 	{ T_UID,	"UID" },
309 	{ T_GID,	"GID" },
310 	{ T_UNSPEC,	"UNSPEC" },
311 	{ T_UNSPECA,	"UNSPECA" },
312 	{ T_TKEY,	"TKEY" },		/* RFC 2930 */
313 	{ T_TSIG,	"TSIG" },		/* RFC 2845 */
314 	{ T_IXFR,	"IXFR" },		/* RFC 1995 */
315 	{ T_AXFR,	"AXFR" },		/* RFC 1035 */
316 	{ T_MAILB,	"MAILB" },		/* RFC 1035 */
317 	{ T_MAILA,	"MAILA" },		/* RFC 1035 */
318 	{ T_ANY,	"ANY" },
319 	{ 0,		NULL }
320 };
321 
322 struct tok ns_class2str[] = {
323 	{ C_IN,		"IN" },		/* Not used */
324 	{ C_CHAOS,	"CHAOS" },
325 	{ C_HS,		"HS" },
326 	{ C_ANY,	"ANY" },
327 	{ 0,		NULL }
328 };
329 
330 /* print a query */
331 static const u_char *
332 ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
333 {
334 	register const u_char *np = cp;
335 	register u_int i, class;
336 
337 	cp = ns_nskip(cp);
338 
339 	if (cp == NULL || !TTEST2(*cp, 4))
340 		return(NULL);
341 
342 	/* print the qtype */
343 	i = EXTRACT_16BITS(cp);
344 	cp += 2;
345 	printf(" %s", tok2str(ns_type2str, "Type%d", i));
346 	/* print the qclass (if it's not IN) */
347 	i = EXTRACT_16BITS(cp);
348 	cp += 2;
349 	if (is_mdns)
350 		class = (i & ~C_QU);
351 	else
352 		class = i;
353 	if (class != C_IN)
354 		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
355 	if (is_mdns && (i & C_QU))
356 		printf(" (QU)");
357 
358 	fputs("? ", stdout);
359 	cp = ns_nprint(np, bp);
360 	return(cp ? cp + 4 : NULL);
361 }
362 
363 /* print a reply */
364 static const u_char *
365 ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
366 {
367 	register u_int i, class, opt_flags = 0;
368 	register u_short typ, len;
369 	register const u_char *rp;
370 
371 	if (vflag) {
372 		putchar(' ');
373 		if ((cp = ns_nprint(cp, bp)) == NULL)
374 			return NULL;
375 	} else
376 		cp = ns_nskip(cp);
377 
378 	if (cp == NULL || !TTEST2(*cp, 10))
379 		return (snapend);
380 
381 	/* print the type/qtype */
382 	typ = EXTRACT_16BITS(cp);
383 	cp += 2;
384 	/* print the class (if it's not IN and the type isn't OPT) */
385 	i = EXTRACT_16BITS(cp);
386 	cp += 2;
387 	if (is_mdns)
388 		class = (i & ~C_CACHE_FLUSH);
389 	else
390 		class = i;
391 	if (class != C_IN && typ != T_OPT)
392 		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
393 	if (is_mdns) {
394 		if (i & C_CACHE_FLUSH)
395 			printf(" (Cache flush)");
396 	}
397 
398 	if (typ == T_OPT) {
399 		/* get opt flags */
400 		cp += 2;
401 		opt_flags = EXTRACT_16BITS(cp);
402 		/* ignore rest of ttl field */
403 		cp += 2;
404 	} else if (vflag > 2) {
405 		/* print ttl */
406 		printf(" [");
407 		relts_print(EXTRACT_32BITS(cp));
408 		printf("]");
409 		cp += 4;
410 	} else {
411 		/* ignore ttl */
412 		cp += 4;
413 	}
414 
415 	len = EXTRACT_16BITS(cp);
416 	cp += 2;
417 
418 	rp = cp + len;
419 
420 	printf(" %s", tok2str(ns_type2str, "Type%d", typ));
421 	if (rp > snapend)
422 		return(NULL);
423 
424 	switch (typ) {
425 	case T_A:
426 		if (!TTEST2(*cp, sizeof(struct in_addr)))
427 			return(NULL);
428 		printf(" %s", ipaddr_string(cp));
429 		break;
430 
431 	case T_NS:
432 	case T_CNAME:
433 	case T_PTR:
434 #ifdef T_DNAME
435 	case T_DNAME:
436 #endif
437 		putchar(' ');
438 		if (ns_nprint(cp, bp) == NULL)
439 			return(NULL);
440 		break;
441 
442 	case T_SOA:
443 		if (!vflag)
444 			break;
445 		putchar(' ');
446 		if ((cp = ns_nprint(cp, bp)) == NULL)
447 			return(NULL);
448 		putchar(' ');
449 		if ((cp = ns_nprint(cp, bp)) == NULL)
450 			return(NULL);
451 		if (!TTEST2(*cp, 5 * 4))
452 			return(NULL);
453 		printf(" %u", EXTRACT_32BITS(cp));
454 		cp += 4;
455 		printf(" %u", EXTRACT_32BITS(cp));
456 		cp += 4;
457 		printf(" %u", EXTRACT_32BITS(cp));
458 		cp += 4;
459 		printf(" %u", EXTRACT_32BITS(cp));
460 		cp += 4;
461 		printf(" %u", EXTRACT_32BITS(cp));
462 		cp += 4;
463 		break;
464 	case T_MX:
465 		putchar(' ');
466 		if (!TTEST2(*cp, 2))
467 			return(NULL);
468 		if (ns_nprint(cp + 2, bp) == NULL)
469 			return(NULL);
470 		printf(" %d", EXTRACT_16BITS(cp));
471 		break;
472 
473 	case T_TXT:
474 		while (cp < rp) {
475 			printf(" \"");
476 			cp = ns_cprint(cp);
477 			if (cp == NULL)
478 				return(NULL);
479 			putchar('"');
480 		}
481 		break;
482 
483 	case T_SRV:
484 		putchar(' ');
485 		if (!TTEST2(*cp, 6))
486 			return(NULL);
487 		if (ns_nprint(cp + 6, bp) == NULL)
488 			return(NULL);
489 		printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
490 			EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
491 		break;
492 
493 #ifdef INET6
494 	case T_AAAA:
495 		if (!TTEST2(*cp, sizeof(struct in6_addr)))
496 			return(NULL);
497 		printf(" %s", ip6addr_string(cp));
498 		break;
499 
500 	case T_A6:
501 	    {
502 		struct in6_addr a;
503 		int pbit, pbyte;
504 
505 		if (!TTEST2(*cp, 1))
506 			return(NULL);
507 		pbit = *cp;
508 		pbyte = (pbit & ~7) / 8;
509 		if (pbit > 128) {
510 			printf(" %u(bad plen)", pbit);
511 			break;
512 		} else if (pbit < 128) {
513 			if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
514 				return(NULL);
515 			memset(&a, 0, sizeof(a));
516 			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
517 			printf(" %u %s", pbit, ip6addr_string(&a));
518 		}
519 		if (pbit > 0) {
520 			putchar(' ');
521 			if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
522 				return(NULL);
523 		}
524 		break;
525 	    }
526 #endif /*INET6*/
527 
528 	case T_OPT:
529 		printf(" UDPsize=%u", class);
530 		if (opt_flags & 0x8000)
531 			printf(" OK");
532 		break;
533 
534 	case T_UNSPECA:		/* One long string */
535 		if (!TTEST2(*cp, len))
536 			return(NULL);
537 		if (fn_printn(cp, len, snapend))
538 			return(NULL);
539 		break;
540 
541 	case T_TSIG:
542 	    {
543 		if (cp + len > snapend)
544 			return(NULL);
545 		if (!vflag)
546 			break;
547 		putchar(' ');
548 		if ((cp = ns_nprint(cp, bp)) == NULL)
549 			return(NULL);
550 		cp += 6;
551 		if (!TTEST2(*cp, 2))
552 			return(NULL);
553 		printf(" fudge=%u", EXTRACT_16BITS(cp));
554 		cp += 2;
555 		if (!TTEST2(*cp, 2))
556 			return(NULL);
557 		printf(" maclen=%u", EXTRACT_16BITS(cp));
558 		cp += 2 + EXTRACT_16BITS(cp);
559 		if (!TTEST2(*cp, 2))
560 			return(NULL);
561 		printf(" origid=%u", EXTRACT_16BITS(cp));
562 		cp += 2;
563 		if (!TTEST2(*cp, 2))
564 			return(NULL);
565 		printf(" error=%u", EXTRACT_16BITS(cp));
566 		cp += 2;
567 		if (!TTEST2(*cp, 2))
568 			return(NULL);
569 		printf(" otherlen=%u", EXTRACT_16BITS(cp));
570 		cp += 2;
571 	    }
572 	}
573 	return (rp);		/* XXX This isn't always right */
574 }
575 
576 void
577 ns_print(register const u_char *bp, u_int length, int is_mdns)
578 {
579 	register const HEADER *np;
580 	register int qdcount, ancount, nscount, arcount;
581 	register const u_char *cp;
582 	u_int16_t b2;
583 
584 	np = (const HEADER *)bp;
585 	TCHECK(*np);
586 	/* get the byte-order right */
587 	qdcount = EXTRACT_16BITS(&np->qdcount);
588 	ancount = EXTRACT_16BITS(&np->ancount);
589 	nscount = EXTRACT_16BITS(&np->nscount);
590 	arcount = EXTRACT_16BITS(&np->arcount);
591 
592 	if (DNS_QR(np)) {
593 		/* this is a response */
594 		printf(" %d%s%s%s%s%s%s",
595 			EXTRACT_16BITS(&np->id),
596 			ns_ops[DNS_OPCODE(np)],
597 			ns_resp[DNS_RCODE(np)],
598 			DNS_AA(np)? "*" : "",
599 			DNS_RA(np)? "" : "-",
600 			DNS_TC(np)? "|" : "",
601 			DNS_AD(np)? "$" : "");
602 
603 		if (qdcount != 1)
604 			printf(" [%dq]", qdcount);
605 		/* Print QUESTION section on -vv */
606 		cp = (const u_char *)(np + 1);
607 		while (qdcount--) {
608 			if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
609 				putchar(',');
610 			if (vflag > 1) {
611 				fputs(" q:", stdout);
612 				if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
613 					goto trunc;
614 			} else {
615 				if ((cp = ns_nskip(cp)) == NULL)
616 					goto trunc;
617 				cp += 4;	/* skip QTYPE and QCLASS */
618 			}
619 		}
620 		printf(" %d/%d/%d", ancount, nscount, arcount);
621 		if (ancount--) {
622 			if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
623 				goto trunc;
624 			while (cp < snapend && ancount--) {
625 				putchar(',');
626 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
627 					goto trunc;
628 			}
629 		}
630 		if (ancount > 0)
631 			goto trunc;
632 		/* Print NS and AR sections on -vv */
633 		if (vflag > 1) {
634 			if (cp < snapend && nscount--) {
635 				fputs(" ns:", stdout);
636 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
637 					goto trunc;
638 				while (cp < snapend && nscount--) {
639 					putchar(',');
640 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
641 						goto trunc;
642 				}
643 			}
644 			if (nscount > 0)
645 				goto trunc;
646 			if (cp < snapend && arcount--) {
647 				fputs(" ar:", stdout);
648 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
649 					goto trunc;
650 				while (cp < snapend && arcount--) {
651 					putchar(',');
652 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
653 						goto trunc;
654 				}
655 			}
656 			if (arcount > 0)
657 				goto trunc;
658 		}
659 	}
660 	else {
661 		/* this is a request */
662 		printf(" %d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
663 		    DNS_RD(np) ? "+" : "",
664 		    DNS_CD(np) ? "%" : "");
665 
666 		/* any weirdness? */
667 		b2 = EXTRACT_16BITS(((u_short *)np)+1);
668 		if (b2 & 0x6cf)
669 			printf(" [b2&3=0x%x]", b2);
670 
671 		if (DNS_OPCODE(np) == IQUERY) {
672 			if (qdcount)
673 				printf(" [%dq]", qdcount);
674 			if (ancount != 1)
675 				printf(" [%da]", ancount);
676 		}
677 		else {
678 			if (ancount)
679 				printf(" [%da]", ancount);
680 			if (qdcount != 1)
681 				printf(" [%dq]", qdcount);
682 		}
683 		if (nscount)
684 			printf(" [%dn]", nscount);
685 		if (arcount)
686 			printf(" [%dau]", arcount);
687 
688 		cp = (const u_char *)(np + 1);
689 		if (qdcount--) {
690 			cp = ns_qprint(cp, (const u_char *)np, is_mdns);
691 			if (!cp)
692 				goto trunc;
693 			while (cp < snapend && qdcount--) {
694 				cp = ns_qprint((const u_char *)cp,
695 					       (const u_char *)np,
696 					       is_mdns);
697 				if (!cp)
698 					goto trunc;
699 			}
700 		}
701 		if (qdcount > 0)
702 			goto trunc;
703 
704 		/* Print remaining sections on -vv */
705 		if (vflag > 1) {
706 			if (ancount--) {
707 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
708 					goto trunc;
709 				while (cp < snapend && ancount--) {
710 					putchar(',');
711 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
712 						goto trunc;
713 				}
714 			}
715 			if (ancount > 0)
716 				goto trunc;
717 			if (cp < snapend && nscount--) {
718 				fputs(" ns:", stdout);
719 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
720 					goto trunc;
721 				while (nscount-- && cp < snapend) {
722 					putchar(',');
723 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
724 						goto trunc;
725 				}
726 			}
727 			if (nscount > 0)
728 				goto trunc;
729 			if (cp < snapend && arcount--) {
730 				fputs(" ar:", stdout);
731 				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
732 					goto trunc;
733 				while (cp < snapend && arcount--) {
734 					putchar(',');
735 					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
736 						goto trunc;
737 				}
738 			}
739 			if (arcount > 0)
740 				goto trunc;
741 		}
742 	}
743 	printf(" (%d)", length);
744 	return;
745 
746   trunc:
747 	printf("[|domain]");
748 	return;
749 }
750