print-domain.c revision 172686 
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 * $FreeBSD: head/contrib/tcpdump/print-domain.c 172686 2007-10-16 02:31:48Z mlaier $
22 */
23
24#ifndef lint
25static const char rcsid[] _U_ =
26    "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.89.2.8 2007/02/13 19:19:27 guy Exp $ (LBL)";
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <tcpdump-stdinc.h>
34
35#include "nameser.h"
36
37#include <stdio.h>
38#include <string.h>
39
40#include "interface.h"
41#include "addrtoname.h"
42#include "extract.h"                    /* must come after interface.h */
43
44static const char *ns_ops[] = {
45	"", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
46	" op8", " updataA", " updateD", " updateDA",
47	" updateM", " updateMA", " zoneInit", " zoneRef",
48};
49
50static const char *ns_resp[] = {
51	"", " FormErr", " ServFail", " NXDomain",
52	" NotImp", " Refused", " YXDomain", " YXRRSet",
53	" NXRRSet", " NotAuth", " NotZone", " Resp11",
54	" Resp12", " Resp13", " Resp14", " NoChange",
55};
56
57/* skip over a domain name */
58static const u_char *
59ns_nskip(register const u_char *cp)
60{
61	register u_char i;
62
63	if (!TTEST2(*cp, 1))
64		return (NULL);
65	i = *cp++;
66	while (i) {
67		if ((i & INDIR_MASK) == INDIR_MASK)
68			return (cp + 1);
69		if ((i & INDIR_MASK) == EDNS0_MASK) {
70			int bitlen, bytelen;
71
72			if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
73				return(NULL); /* unknown ELT */
74			if (!TTEST2(*cp, 1))
75				return (NULL);
76			if ((bitlen = *cp++) == 0)
77				bitlen = 256;
78			bytelen = (bitlen + 7) / 8;
79			cp += bytelen;
80		} else
81			cp += i;
82		if (!TTEST2(*cp, 1))
83			return (NULL);
84		i = *cp++;
85	}
86	return (cp);
87}
88
89/* print a <domain-name> */
90static const u_char *
91blabel_print(const u_char *cp)
92{
93	int bitlen, slen, b;
94	const u_char *bitp, *lim;
95	char tc;
96
97	if (!TTEST2(*cp, 1))
98		return(NULL);
99	if ((bitlen = *cp) == 0)
100		bitlen = 256;
101	slen = (bitlen + 3) / 4;
102	lim = cp + 1 + slen;
103
104	/* print the bit string as a hex string */
105	printf("\\[x");
106	for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
107		TCHECK(*bitp);
108		printf("%02x", *bitp);
109	}
110	if (b > 4) {
111		TCHECK(*bitp);
112		tc = *bitp++;
113		printf("%02x", tc & (0xff << (8 - b)));
114	} else if (b > 0) {
115		TCHECK(*bitp);
116		tc = *bitp++;
117		printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
118	}
119	printf("/%d]", bitlen);
120	return lim;
121trunc:
122	printf(".../%d]", bitlen);
123	return NULL;
124}
125
126static int
127labellen(const u_char *cp)
128{
129	register u_int i;
130
131	if (!TTEST2(*cp, 1))
132		return(-1);
133	i = *cp;
134	if ((i & INDIR_MASK) == EDNS0_MASK) {
135		int bitlen, elt;
136		if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
137			printf("<ELT %d>", elt);
138			return(-1);
139		}
140		if (!TTEST2(*(cp + 1), 1))
141			return(-1);
142		if ((bitlen = *(cp + 1)) == 0)
143			bitlen = 256;
144		return(((bitlen + 7) / 8) + 1);
145	} else
146		return(i);
147}
148
149static const u_char *
150ns_nprint(register const u_char *cp, register const u_char *bp)
151{
152	register u_int i, l;
153	register const u_char *rp = NULL;
154	register int compress = 0;
155	int chars_processed;
156	int elt;
157	int data_size = snapend - bp;
158
159	if ((l = labellen(cp)) == (u_int)-1)
160		return(NULL);
161	if (!TTEST2(*cp, 1))
162		return(NULL);
163	chars_processed = 1;
164	if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
165		compress = 0;
166		rp = cp + l;
167	}
168
169	if (i != 0)
170		while (i && cp < snapend) {
171			if ((i & INDIR_MASK) == INDIR_MASK) {
172				if (!compress) {
173					rp = cp + 1;
174					compress = 1;
175				}
176				if (!TTEST2(*cp, 1))
177					return(NULL);
178				cp = bp + (((i << 8) | *cp) & 0x3fff);
179				if ((l = labellen(cp)) == (u_int)-1)
180					return(NULL);
181				if (!TTEST2(*cp, 1))
182					return(NULL);
183				i = *cp++;
184				chars_processed++;
185
186				/*
187				 * If we've looked at every character in
188				 * the message, this pointer will make
189				 * us look at some character again,
190				 * which means we're looping.
191				 */
192				if (chars_processed >= data_size) {
193					printf("<LOOP>");
194					return (NULL);
195				}
196				continue;
197			}
198			if ((i & INDIR_MASK) == EDNS0_MASK) {
199				elt = (i & ~INDIR_MASK);
200				switch(elt) {
201				case EDNS0_ELT_BITLABEL:
202					if (blabel_print(cp) == NULL)
203						return (NULL);
204					break;
205				default:
206					/* unknown ELT */
207					printf("<ELT %d>", elt);
208					return(NULL);
209				}
210			} else {
211				if (fn_printn(cp, l, snapend))
212					return(NULL);
213			}
214
215			cp += l;
216			chars_processed += l;
217			putchar('.');
218			if ((l = labellen(cp)) == (u_int)-1)
219				return(NULL);
220			if (!TTEST2(*cp, 1))
221				return(NULL);
222			i = *cp++;
223			chars_processed++;
224			if (!compress)
225				rp += l + 1;
226		}
227	else
228		putchar('.');
229	return (rp);
230}
231
232/* print a <character-string> */
233static const u_char *
234ns_cprint(register const u_char *cp)
235{
236	register u_int i;
237
238	if (!TTEST2(*cp, 1))
239		return (NULL);
240	i = *cp++;
241	if (fn_printn(cp, i, snapend))
242		return (NULL);
243	return (cp + i);
244}
245
246/* http://www.iana.org/assignments/dns-parameters */
247struct tok ns_type2str[] = {
248	{ T_A,		"A" },			/* RFC 1035 */
249	{ T_NS,		"NS" },			/* RFC 1035 */
250	{ T_MD,		"MD" },			/* RFC 1035 */
251	{ T_MF,		"MF" },			/* RFC 1035 */
252	{ T_CNAME,	"CNAME" },		/* RFC 1035 */
253	{ T_SOA,	"SOA" },		/* RFC 1035 */
254	{ T_MB,		"MB" },			/* RFC 1035 */
255	{ T_MG,		"MG" },			/* RFC 1035 */
256	{ T_MR,		"MR" },			/* RFC 1035 */
257	{ T_NULL,	"NULL" },		/* RFC 1035 */
258	{ T_WKS,	"WKS" },		/* RFC 1035 */
259	{ T_PTR,	"PTR" },		/* RFC 1035 */
260	{ T_HINFO,	"HINFO" },		/* RFC 1035 */
261	{ T_MINFO,	"MINFO" },		/* RFC 1035 */
262	{ T_MX,		"MX" },			/* RFC 1035 */
263	{ T_TXT,	"TXT" },		/* RFC 1035 */
264	{ T_RP,		"RP" },			/* RFC 1183 */
265	{ T_AFSDB,	"AFSDB" },		/* RFC 1183 */
266	{ T_X25,	"X25" },		/* RFC 1183 */
267	{ T_ISDN,	"ISDN" },		/* RFC 1183 */
268	{ T_RT,		"RT" },			/* RFC 1183 */
269	{ T_NSAP,	"NSAP" },		/* RFC 1706 */
270	{ T_NSAP_PTR,	"NSAP_PTR" },
271	{ T_SIG,	"SIG" },		/* RFC 2535 */
272	{ T_KEY,	"KEY" },		/* RFC 2535 */
273	{ T_PX,		"PX" },			/* RFC 2163 */
274	{ T_GPOS,	"GPOS" },		/* RFC 1712 */
275	{ T_AAAA,	"AAAA" },		/* RFC 1886 */
276	{ T_LOC,	"LOC" },		/* RFC 1876 */
277	{ T_NXT,	"NXT" },		/* RFC 2535 */
278	{ T_EID,	"EID" },		/* Nimrod */
279	{ T_NIMLOC,	"NIMLOC" },		/* Nimrod */
280	{ T_SRV,	"SRV" },		/* RFC 2782 */
281	{ T_ATMA,	"ATMA" },		/* ATM Forum */
282	{ T_NAPTR,	"NAPTR" },		/* RFC 2168, RFC 2915 */
283	{ T_KX,		"KX" },			/* RFC 2230 */
284	{ T_CERT,	"CERT" },		/* RFC 2538 */
285	{ T_A6,		"A6" },			/* RFC 2874 */
286	{ T_DNAME,	"DNAME" },		/* RFC 2672 */
287	{ T_SINK, 	"SINK" },
288	{ T_OPT,	"OPT" },		/* RFC 2671 */
289	{ T_APL, 	"APL" },		/* RFC 3123 */
290	{ T_DS,		"DS" },			/* RFC 4034 */
291	{ T_SSHFP,	"SSHFP" },		/* RFC 4255 */
292	{ T_IPSECKEY,	"IPSECKEY" },		/* RFC 4025 */
293	{ T_RRSIG, 	"RRSIG" },		/* RFC 4034 */
294	{ T_NSEC,	"NSEC" },		/* RFC 4034 */
295	{ T_DNSKEY,	"DNSKEY" },		/* RFC 4034 */
296	{ T_SPF,	"SPF" },		/* RFC-schlitt-spf-classic-02.txt */
297	{ T_UINFO,	"UINFO" },
298	{ T_UID,	"UID" },
299	{ T_GID,	"GID" },
300	{ T_UNSPEC,	"UNSPEC" },
301	{ T_UNSPECA,	"UNSPECA" },
302	{ T_TKEY,	"TKEY" },		/* RFC 2930 */
303	{ T_TSIG,	"TSIG" },		/* RFC 2845 */
304	{ T_IXFR,	"IXFR" },		/* RFC 1995 */
305	{ T_AXFR,	"AXFR" },		/* RFC 1035 */
306	{ T_MAILB,	"MAILB" },		/* RFC 1035 */
307	{ T_MAILA,	"MAILA" },		/* RFC 1035 */
308	{ T_ANY,	"ANY" },
309	{ 0,		NULL }
310};
311
312struct tok ns_class2str[] = {
313	{ C_IN,		"IN" },		/* Not used */
314	{ C_CHAOS,	"CHAOS" },
315	{ C_HS,		"HS" },
316	{ C_ANY,	"ANY" },
317	{ 0,		NULL }
318};
319
320/* print a query */
321static const u_char *
322ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
323{
324	register const u_char *np = cp;
325	register u_int i, class;
326
327	cp = ns_nskip(cp);
328
329	if (cp == NULL || !TTEST2(*cp, 4))
330		return(NULL);
331
332	/* print the qtype */
333	i = EXTRACT_16BITS(cp);
334	cp += 2;
335	printf(" %s", tok2str(ns_type2str, "Type%d", i));
336	/* print the qclass (if it's not IN) */
337	i = EXTRACT_16BITS(cp);
338	cp += 2;
339	if (is_mdns)
340		class = (i & ~C_QU);
341	else
342		class = i;
343	if (class != C_IN)
344		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
345	if (is_mdns) {
346		if (i & C_QU)
347			printf(" (QU)");
348		else
349			printf(" (QM)");
350	}
351
352	fputs("? ", stdout);
353	cp = ns_nprint(np, bp);
354	return(cp ? cp + 4 : NULL);
355}
356
357/* print a reply */
358static const u_char *
359ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
360{
361	register u_int i, class, opt_flags = 0;
362	register u_short typ, len;
363	register const u_char *rp;
364
365	if (vflag) {
366		putchar(' ');
367		if ((cp = ns_nprint(cp, bp)) == NULL)
368			return NULL;
369	} else
370		cp = ns_nskip(cp);
371
372	if (cp == NULL || !TTEST2(*cp, 10))
373		return (snapend);
374
375	/* print the type/qtype */
376	typ = EXTRACT_16BITS(cp);
377	cp += 2;
378	/* print the class (if it's not IN and the type isn't OPT) */
379	i = EXTRACT_16BITS(cp);
380	cp += 2;
381	if (is_mdns)
382		class = (i & ~C_CACHE_FLUSH);
383	else
384		class = i;
385	if (class != C_IN && typ != T_OPT)
386		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
387	if (is_mdns) {
388		if (i & C_CACHE_FLUSH)
389			printf(" (Cache flush)");
390	}
391
392	/* ignore ttl */
393	cp += 2;
394	/* if T_OPT, save opt_flags */
395	if (typ == T_OPT)
396		opt_flags = EXTRACT_16BITS(cp);
397	/* ignore rest of ttl */
398	cp += 2;
399
400	len = EXTRACT_16BITS(cp);
401	cp += 2;
402
403	rp = cp + len;
404
405	printf(" %s", tok2str(ns_type2str, "Type%d", typ));
406	if (rp > snapend)
407		return(NULL);
408
409	switch (typ) {
410	case T_A:
411		if (!TTEST2(*cp, sizeof(struct in_addr)))
412			return(NULL);
413		printf(" %s", ipaddr_string(cp));
414		break;
415
416	case T_NS:
417	case T_CNAME:
418	case T_PTR:
419#ifdef T_DNAME
420	case T_DNAME:
421#endif
422		putchar(' ');
423		if (ns_nprint(cp, bp) == NULL)
424			return(NULL);
425		break;
426
427	case T_SOA:
428		if (!vflag)
429			break;
430		putchar(' ');
431		if ((cp = ns_nprint(cp, bp)) == NULL)
432			return(NULL);
433		putchar(' ');
434		if ((cp = ns_nprint(cp, bp)) == NULL)
435			return(NULL);
436		if (!TTEST2(*cp, 5 * 4))
437			return(NULL);
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		printf(" %u", EXTRACT_32BITS(cp));
447		cp += 4;
448		break;
449	case T_MX:
450		putchar(' ');
451		if (!TTEST2(*cp, 2))
452			return(NULL);
453		if (ns_nprint(cp + 2, bp) == NULL)
454			return(NULL);
455		printf(" %d", EXTRACT_16BITS(cp));
456		break;
457
458	case T_TXT:
459		while (cp < rp) {
460			printf(" \"");
461			cp = ns_cprint(cp);
462			if (cp == NULL)
463				return(NULL);
464			putchar('"');
465		}
466		break;
467
468	case T_SRV:
469		putchar(' ');
470		if (!TTEST2(*cp, 6))
471			return(NULL);
472		if (ns_nprint(cp + 6, bp) == NULL)
473			return(NULL);
474		printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
475			EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
476		break;
477
478#ifdef INET6
479	case T_AAAA:
480		if (!TTEST2(*cp, sizeof(struct in6_addr)))
481			return(NULL);
482		printf(" %s", ip6addr_string(cp));
483		break;
484
485	case T_A6:
486	    {
487		struct in6_addr a;
488		int pbit, pbyte;
489
490		if (!TTEST2(*cp, 1))
491			return(NULL);
492		pbit = *cp;
493		pbyte = (pbit & ~7) / 8;
494		if (pbit > 128) {
495			printf(" %u(bad plen)", pbit);
496			break;
497		} else if (pbit < 128) {
498			if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
499				return(NULL);
500			memset(&a, 0, sizeof(a));
501			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
502			printf(" %u %s", pbit, ip6addr_string(&a));
503		}
504		if (pbit > 0) {
505			putchar(' ');
506			if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
507				return(NULL);
508		}
509		break;
510	    }
511#endif /*INET6*/
512
513	case T_OPT:
514		printf(" UDPsize=%u", class);
515		if (opt_flags & 0x8000)
516			printf(" OK");
517		break;
518
519	case T_UNSPECA:		/* One long string */
520		if (!TTEST2(*cp, len))
521			return(NULL);
522		if (fn_printn(cp, len, snapend))
523			return(NULL);
524		break;
525
526	case T_TSIG:
527	    {
528		if (cp + len > snapend)
529			return(NULL);
530		if (!vflag)
531			break;
532		putchar(' ');
533		if ((cp = ns_nprint(cp, bp)) == NULL)
534			return(NULL);
535		cp += 6;
536		if (!TTEST2(*cp, 2))
537			return(NULL);
538		printf(" fudge=%u", EXTRACT_16BITS(cp));
539		cp += 2;
540		if (!TTEST2(*cp, 2))
541			return(NULL);
542		printf(" maclen=%u", EXTRACT_16BITS(cp));
543		cp += 2 + EXTRACT_16BITS(cp);
544		if (!TTEST2(*cp, 2))
545			return(NULL);
546		printf(" origid=%u", EXTRACT_16BITS(cp));
547		cp += 2;
548		if (!TTEST2(*cp, 2))
549			return(NULL);
550		printf(" error=%u", EXTRACT_16BITS(cp));
551		cp += 2;
552		if (!TTEST2(*cp, 2))
553			return(NULL);
554		printf(" otherlen=%u", EXTRACT_16BITS(cp));
555		cp += 2;
556	    }
557	}
558	return (rp);		/* XXX This isn't always right */
559}
560
561void
562ns_print(register const u_char *bp, u_int length, int is_mdns)
563{
564	register const HEADER *np;
565	register int qdcount, ancount, nscount, arcount;
566	register const u_char *cp;
567	u_int16_t b2;
568
569	np = (const HEADER *)bp;
570	TCHECK(*np);
571	/* get the byte-order right */
572	qdcount = EXTRACT_16BITS(&np->qdcount);
573	ancount = EXTRACT_16BITS(&np->ancount);
574	nscount = EXTRACT_16BITS(&np->nscount);
575	arcount = EXTRACT_16BITS(&np->arcount);
576
577	if (DNS_QR(np)) {
578		/* this is a response */
579		printf("%d%s%s%s%s%s%s",
580			EXTRACT_16BITS(&np->id),
581			ns_ops[DNS_OPCODE(np)],
582			ns_resp[DNS_RCODE(np)],
583			DNS_AA(np)? "*" : "",
584			DNS_RA(np)? "" : "-",
585			DNS_TC(np)? "|" : "",
586			DNS_AD(np)? "$" : "");
587
588		if (qdcount != 1)
589			printf(" [%dq]", qdcount);
590		/* Print QUESTION section on -vv */
591		cp = (const u_char *)(np + 1);
592		while (qdcount--) {
593			if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
594				putchar(',');
595			if (vflag > 1) {
596				fputs(" q:", stdout);
597				if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
598					goto trunc;
599			} else {
600				if ((cp = ns_nskip(cp)) == NULL)
601					goto trunc;
602				cp += 4;	/* skip QTYPE and QCLASS */
603			}
604		}
605		printf(" %d/%d/%d", ancount, nscount, arcount);
606		if (ancount--) {
607			if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
608				goto trunc;
609			while (cp < snapend && ancount--) {
610				putchar(',');
611				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
612					goto trunc;
613			}
614		}
615		if (ancount > 0)
616			goto trunc;
617		/* Print NS and AR sections on -vv */
618		if (vflag > 1) {
619			if (cp < snapend && nscount--) {
620				fputs(" ns:", stdout);
621				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
622					goto trunc;
623				while (cp < snapend && nscount--) {
624					putchar(',');
625					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
626						goto trunc;
627				}
628			}
629			if (nscount > 0)
630				goto trunc;
631			if (cp < snapend && arcount--) {
632				fputs(" ar:", stdout);
633				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
634					goto trunc;
635				while (cp < snapend && arcount--) {
636					putchar(',');
637					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
638						goto trunc;
639				}
640			}
641			if (arcount > 0)
642				goto trunc;
643		}
644	}
645	else {
646		/* this is a request */
647		printf("%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
648		    DNS_RD(np) ? "+" : "",
649		    DNS_CD(np) ? "%" : "");
650
651		/* any weirdness? */
652		b2 = EXTRACT_16BITS(((u_short *)np)+1);
653		if (b2 & 0x6cf)
654			printf(" [b2&3=0x%x]", b2);
655
656		if (DNS_OPCODE(np) == IQUERY) {
657			if (qdcount)
658				printf(" [%dq]", qdcount);
659			if (ancount != 1)
660				printf(" [%da]", ancount);
661		}
662		else {
663			if (ancount)
664				printf(" [%da]", ancount);
665			if (qdcount != 1)
666				printf(" [%dq]", qdcount);
667		}
668		if (nscount)
669			printf(" [%dn]", nscount);
670		if (arcount)
671			printf(" [%dau]", arcount);
672
673		cp = (const u_char *)(np + 1);
674		if (qdcount--) {
675			cp = ns_qprint(cp, (const u_char *)np, is_mdns);
676			if (!cp)
677				goto trunc;
678			while (cp < snapend && qdcount--) {
679				cp = ns_qprint((const u_char *)cp,
680					       (const u_char *)np,
681					       is_mdns);
682				if (!cp)
683					goto trunc;
684			}
685		}
686		if (qdcount > 0)
687			goto trunc;
688
689		/* Print remaining sections on -vv */
690		if (vflag > 1) {
691			if (ancount--) {
692				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
693					goto trunc;
694				while (cp < snapend && ancount--) {
695					putchar(',');
696					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
697						goto trunc;
698				}
699			}
700			if (ancount > 0)
701				goto trunc;
702			if (cp < snapend && nscount--) {
703				fputs(" ns:", stdout);
704				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
705					goto trunc;
706				while (nscount-- && cp < snapend) {
707					putchar(',');
708					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
709						goto trunc;
710				}
711			}
712			if (nscount > 0)
713				goto trunc;
714			if (cp < snapend && arcount--) {
715				fputs(" ar:", stdout);
716				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
717					goto trunc;
718				while (cp < snapend && arcount--) {
719					putchar(',');
720					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
721						goto trunc;
722				}
723			}
724			if (arcount > 0)
725				goto trunc;
726		}
727	}
728	printf(" (%d)", length);
729	return;
730
731  trunc:
732	printf("[|domain]");
733	return;
734}
735