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The topmost bit in the class field isn't a "cache flush" flag in mDNS
[tcpdump] / print-domain.c
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 1.89.2.4 2006-11-10 03:15:35 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, qu;
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 qu = (i & C_QU);
340 } else {
341 class = i;
342 qu = 0;
343 }
344 if (class != C_IN)
345 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
346 if (qu)
347 printf(" (QU)");
348 else
349 printf(" (QM)");
350
351 fputs("? ", stdout);
352 cp = ns_nprint(np, bp);
353 return(cp ? cp + 4 : NULL);
354 }
355
356 /* print a reply */
357 static const u_char *
358 ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
359 {
360 register u_int i, class, cache_flush, opt_flags = 0;
361 register u_short typ, len;
362 register const u_char *rp;
363
364 if (vflag) {
365 putchar(' ');
366 if ((cp = ns_nprint(cp, bp)) == NULL)
367 return NULL;
368 } else
369 cp = ns_nskip(cp);
370
371 if (cp == NULL || !TTEST2(*cp, 10))
372 return (snapend);
373
374 /* print the type/qtype */
375 typ = EXTRACT_16BITS(cp);
376 cp += 2;
377 /* print the class (if it's not IN and the type isn't OPT) */
378 i = EXTRACT_16BITS(cp);
379 cp += 2;
380 if (is_mdns) {
381 class = (i & ~C_CACHE_FLUSH);
382 cache_flush = i & C_CACHE_FLUSH;
383 } else {
384 class = i;
385 cache_flush = 0;
386 }
387 if (class != C_IN && typ != T_OPT)
388 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
389 if (cache_flush)
390 printf(" (Cache flush)");
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
561 void
562 ns_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 }
[mirror] the TCPdump network dissector