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Merge from vendor branch LIBPCAP:
[dragonfly.git] / contrib / tcpdump-3.8.3 / print-domain.c
blobe24869c20e3c64fe9d3372efc70106a0d64f1480
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 1.86.2.3 2004/03/28 20:54:00 fenner 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
135 if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL)
136 return(-1);
137 if (!TTEST2(*(cp + 1), 1))
138 return(-1);
139 if ((bitlen = *(cp + 1)) == 0)
140 bitlen = 256;
141 return(((bitlen + 7) / 8) + 1);
142 } else
143 return(i);
144 }
145
146 static const u_char *
147 ns_nprint(register const u_char *cp, register const u_char *bp)
148 {
149 register u_int i, l;
150 register const u_char *rp = NULL;
151 register int compress = 0;
152 int chars_processed;
153 int elt;
154 int data_size = snapend - bp;
155
156 if ((l = labellen(cp)) == (u_int)-1)
157 return(NULL);
158 if (!TTEST2(*cp, 1))
159 return(NULL);
160 chars_processed = 1;
161 if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
162 compress = 0;
163 rp = cp + l;
164 }
165
166 if (i != 0)
167 while (i && cp < snapend) {
168 if ((i & INDIR_MASK) == INDIR_MASK) {
169 if (!compress) {
170 rp = cp + 1;
171 compress = 1;
172 }
173 if (!TTEST2(*cp, 1))
174 return(NULL);
175 cp = bp + (((i << 8) | *cp) & 0x3fff);
176 if ((l = labellen(cp)) == (u_int)-1)
177 return(NULL);
178 if (!TTEST2(*cp, 1))
179 return(NULL);
180 i = *cp++;
181 chars_processed++;
182
183 /*
184 * If we've looked at every character in
185 * the message, this pointer will make
186 * us look at some character again,
187 * which means we're looping.
188 */
189 if (chars_processed >= data_size) {
190 printf("<LOOP>");
191 return (NULL);
192 }
193 continue;
194 }
195 if ((i & INDIR_MASK) == EDNS0_MASK) {
196 elt = (i & ~INDIR_MASK);
197 switch(elt) {
198 case EDNS0_ELT_BITLABEL:
199 if (blabel_print(cp) == NULL)
200 return (NULL);
201 break;
202 default:
203 /* unknown ELT */
204 printf("<ELT %d>", elt);
205 return(NULL);
206 }
207 } else {
208 if (fn_printn(cp, l, snapend))
209 return(NULL);
210 }
211
212 cp += l;
213 chars_processed += l;
214 putchar('.');
215 if ((l = labellen(cp)) == (u_int)-1)
216 return(NULL);
217 if (!TTEST2(*cp, 1))
218 return(NULL);
219 i = *cp++;
220 chars_processed++;
221 if (!compress)
222 rp += l + 1;
223 }
224 else
225 putchar('.');
226 return (rp);
227 }
228
229 /* print a <character-string> */
230 static const u_char *
231 ns_cprint(register const u_char *cp)
232 {
233 register u_int i;
234
235 if (!TTEST2(*cp, 1))
236 return (NULL);
237 i = *cp++;
238 if (fn_printn(cp, i, snapend))
239 return (NULL);
240 return (cp + i);
241 }
242
243 /* http://www.iana.org/assignments/dns-parameters */
244 struct tok ns_type2str[] = {
245 { T_A, "A" }, /* RFC 1035 */
246 { T_NS, "NS" }, /* RFC 1035 */
247 { T_MD, "MD" }, /* RFC 1035 */
248 { T_MF, "MF" }, /* RFC 1035 */
249 { T_CNAME, "CNAME" }, /* RFC 1035 */
250 { T_SOA, "SOA" }, /* RFC 1035 */
251 { T_MB, "MB" }, /* RFC 1035 */
252 { T_MG, "MG" }, /* RFC 1035 */
253 { T_MR, "MR" }, /* RFC 1035 */
254 { T_NULL, "NULL" }, /* RFC 1035 */
255 { T_WKS, "WKS" }, /* RFC 1035 */
256 { T_PTR, "PTR" }, /* RFC 1035 */
257 { T_HINFO, "HINFO" }, /* RFC 1035 */
258 { T_MINFO, "MINFO" }, /* RFC 1035 */
259 { T_MX, "MX" }, /* RFC 1035 */
260 { T_TXT, "TXT" }, /* RFC 1035 */
261 { T_RP, "RP" }, /* RFC 1183 */
262 { T_AFSDB, "AFSDB" }, /* RFC 1183 */
263 { T_X25, "X25" }, /* RFC 1183 */
264 { T_ISDN, "ISDN" }, /* RFC 1183 */
265 { T_RT, "RT" }, /* RFC 1183 */
266 { T_NSAP, "NSAP" }, /* RFC 1706 */
267 { T_NSAP_PTR, "NSAP_PTR" },
268 { T_SIG, "SIG" }, /* RFC 2535 */
269 { T_KEY, "KEY" }, /* RFC 2535 */
270 { T_PX, "PX" }, /* RFC 2163 */
271 { T_GPOS, "GPOS" }, /* RFC 1712 */
272 { T_AAAA, "AAAA" }, /* RFC 1886 */
273 { T_LOC, "LOC" }, /* RFC 1876 */
274 { T_NXT, "NXT" }, /* RFC 2535 */
275 { T_EID, "EID" }, /* Nimrod */
276 { T_NIMLOC, "NIMLOC" }, /* Nimrod */
277 { T_SRV, "SRV" }, /* RFC 2782 */
278 { T_ATMA, "ATMA" }, /* ATM Forum */
279 { T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */
280 { T_A6, "A6" }, /* RFC 2874 */
281 { T_DNAME, "DNAME" }, /* RFC 2672 */
282 { T_OPT, "OPT" }, /* RFC 2671 */
283 { T_UINFO, "UINFO" },
284 { T_UID, "UID" },
285 { T_GID, "GID" },
286 { T_UNSPEC, "UNSPEC" },
287 { T_UNSPECA, "UNSPECA" },
288 { T_TKEY, "TKEY" }, /* RFC 2930 */
289 { T_TSIG, "TSIG" }, /* RFC 2845 */
290 { T_IXFR, "IXFR" }, /* RFC 1995 */
291 { T_AXFR, "AXFR" }, /* RFC 1035 */
292 { T_MAILB, "MAILB" }, /* RFC 1035 */
293 { T_MAILA, "MAILA" }, /* RFC 1035 */
294 { T_ANY, "ANY" },
295 { 0, NULL }
296 };
297
298 struct tok ns_class2str[] = {
299 { C_IN, "IN" }, /* Not used */
300 { C_CHAOS, "CHAOS" },
301 { C_HS, "HS" },
302 { C_ANY, "ANY" },
303 { 0, NULL }
304 };
305
306 /* print a query */
307 static const u_char *
308 ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
309 {
310 register const u_char *np = cp;
311 register u_int i;
312
313 cp = ns_nskip(cp);
314
315 if (cp == NULL || !TTEST2(*cp, 4))
316 return(NULL);
317
318 /* print the qtype and qclass (if it's not IN) */
319 i = EXTRACT_16BITS(cp);
320 cp += 2;
321 printf(" %s", tok2str(ns_type2str, "Type%d", i));
322 i = EXTRACT_16BITS(cp);
323 cp += 2;
324 if (is_mdns && i == (C_IN|C_CACHE_FLUSH))
325 printf(" (Cache flush)");
326 else if (i != C_IN)
327 printf(" %s", tok2str(ns_class2str, "(Class %d)", i));
328
329 fputs("? ", stdout);
330 cp = ns_nprint(np, bp);
331 return(cp ? cp + 4 : NULL);
332 }
333
334 /* print a reply */
335 static const u_char *
336 ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
337 {
338 register u_int class;
339 register u_short typ, len;
340 register const u_char *rp;
341
342 if (vflag) {
343 putchar(' ');
344 if ((cp = ns_nprint(cp, bp)) == NULL)
345 return NULL;
346 } else
347 cp = ns_nskip(cp);
348
349 if (cp == NULL || !TTEST2(*cp, 10))
350 return (snapend);
351
352 /* print the type/qtype and class (if it's not IN) */
353 typ = EXTRACT_16BITS(cp);
354 cp += 2;
355 class = EXTRACT_16BITS(cp);
356 cp += 2;
357 if (is_mdns && class == (C_IN|C_CACHE_FLUSH))
358 printf(" (Cache flush)");
359 else if (class != C_IN && typ != T_OPT)
360 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
361
362 /* ignore ttl */
363 cp += 4;
364
365 len = EXTRACT_16BITS(cp);
366 cp += 2;
367
368 rp = cp + len;
369
370 printf(" %s", tok2str(ns_type2str, "Type%d", typ));
371 if (rp > snapend)
372 return(NULL);
373
374 switch (typ) {
375 case T_A:
376 if (!TTEST2(*cp, sizeof(struct in_addr)))
377 return(NULL);
378 printf(" %s", ipaddr_string(cp));
379 break;
380
381 case T_NS:
382 case T_CNAME:
383 case T_PTR:
384 #ifdef T_DNAME
385 case T_DNAME:
386 #endif
387 putchar(' ');
388 if (ns_nprint(cp, bp) == NULL)
389 return(NULL);
390 break;
391
392 case T_SOA:
393 if (!vflag)
394 break;
395 putchar(' ');
396 if ((cp = ns_nprint(cp, bp)) == NULL)
397 return(NULL);
398 putchar(' ');
399 if ((cp = ns_nprint(cp, bp)) == NULL)
400 return(NULL);
401 if (!TTEST2(*cp, 5 * 4))
402 return(NULL);
403 printf(" %u", EXTRACT_32BITS(cp));
404 cp += 4;
405 printf(" %u", EXTRACT_32BITS(cp));
406 cp += 4;
407 printf(" %u", EXTRACT_32BITS(cp));
408 cp += 4;
409 printf(" %u", EXTRACT_32BITS(cp));
410 cp += 4;
411 printf(" %u", EXTRACT_32BITS(cp));
412 cp += 4;
413 break;
414 case T_MX:
415 putchar(' ');
416 if (!TTEST2(*cp, 2))
417 return(NULL);
418 if (ns_nprint(cp + 2, bp) == NULL)
419 return(NULL);
420 printf(" %d", EXTRACT_16BITS(cp));
421 break;
422
423 case T_TXT:
424 while (cp < rp) {
425 printf(" \"");
426 cp = ns_cprint(cp);
427 if (cp == NULL)
428 return(NULL);
429 putchar('"');
430 }
431 break;
432
433 case T_SRV:
434 putchar(' ');
435 if (!TTEST2(*cp, 6))
436 return(NULL);
437 if (ns_nprint(cp + 6, bp) == NULL)
438 return(NULL);
439 printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
440 EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
441 break;
442
443 #ifdef INET6
444 case T_AAAA:
445 if (!TTEST2(*cp, sizeof(struct in6_addr)))
446 return(NULL);
447 printf(" %s", ip6addr_string(cp));
448 break;
449
450 case T_A6:
451 {
452 struct in6_addr a;
453 int pbit, pbyte;
454
455 if (!TTEST2(*cp, 1))
456 return(NULL);
457 pbit = *cp;
458 pbyte = (pbit & ~7) / 8;
459 if (pbit > 128) {
460 printf(" %u(bad plen)", pbit);
461 break;
462 } else if (pbit < 128) {
463 if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
464 return(NULL);
465 memset(&a, 0, sizeof(a));
466 memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
467 printf(" %u %s", pbit, ip6addr_string(&a));
468 }
469 if (pbit > 0) {
470 putchar(' ');
471 if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
472 return(NULL);
473 }
474 break;
475 }
476 #endif /*INET6*/
477
478 case T_OPT:
479 printf(" UDPsize=%u", class);
480 break;
481
482 case T_UNSPECA: /* One long string */
483 if (!TTEST2(*cp, len))
484 return(NULL);
485 if (fn_printn(cp, len, snapend))
486 return(NULL);
487 break;
488
489 case T_TSIG:
490 {
491 if (cp + len > snapend)
492 return(NULL);
493 if (!vflag)
494 break;
495 putchar(' ');
496 if ((cp = ns_nprint(cp, bp)) == NULL)
497 return(NULL);
498 cp += 6;
499 if (!TTEST2(*cp, 2))
500 return(NULL);
501 printf(" fudge=%u", EXTRACT_16BITS(cp));
502 cp += 2;
503 if (!TTEST2(*cp, 2))
504 return(NULL);
505 printf(" maclen=%u", EXTRACT_16BITS(cp));
506 cp += 2 + EXTRACT_16BITS(cp);
507 if (!TTEST2(*cp, 2))
508 return(NULL);
509 printf(" origid=%u", EXTRACT_16BITS(cp));
510 cp += 2;
511 if (!TTEST2(*cp, 2))
512 return(NULL);
513 printf(" error=%u", EXTRACT_16BITS(cp));
514 cp += 2;
515 if (!TTEST2(*cp, 2))
516 return(NULL);
517 printf(" otherlen=%u", EXTRACT_16BITS(cp));
518 cp += 2;
519 }
520 }
521 return (rp); /* XXX This isn't always right */
522 }
523
524 void
525 ns_print(register const u_char *bp, u_int length, int is_mdns)
526 {
527 register const HEADER *np;
528 register int qdcount, ancount, nscount, arcount;
529 register const u_char *cp;
530 u_int16_t b2;
531
532 np = (const HEADER *)bp;
533 TCHECK(*np);
534 /* get the byte-order right */
535 qdcount = EXTRACT_16BITS(&np->qdcount);
536 ancount = EXTRACT_16BITS(&np->ancount);
537 nscount = EXTRACT_16BITS(&np->nscount);
538 arcount = EXTRACT_16BITS(&np->arcount);
539
540 if (DNS_QR(np)) {
541 /* this is a response */
542 printf(" %d%s%s%s%s%s%s",
543 EXTRACT_16BITS(&np->id),
544 ns_ops[DNS_OPCODE(np)],
545 ns_resp[DNS_RCODE(np)],
546 DNS_AA(np)? "*" : "",
547 DNS_RA(np)? "" : "-",
548 DNS_TC(np)? "|" : "",
549 DNS_AD(np)? "$" : "");
550
551 if (qdcount != 1)
552 printf(" [%dq]", qdcount);
553 /* Print QUESTION section on -vv */
554 cp = (const u_char *)(np + 1);
555 while (qdcount--) {
556 if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
557 putchar(',');
558 if (vflag > 1) {
559 fputs(" q:", stdout);
560 if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
561 goto trunc;
562 } else {
563 if ((cp = ns_nskip(cp)) == NULL)
564 goto trunc;
565 cp += 4; /* skip QTYPE and QCLASS */
566 }
567 }
568 printf(" %d/%d/%d", ancount, nscount, arcount);
569 if (ancount--) {
570 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
571 goto trunc;
572 while (cp < snapend && ancount--) {
573 putchar(',');
574 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
575 goto trunc;
576 }
577 }
578 if (ancount > 0)
579 goto trunc;
580 /* Print NS and AR sections on -vv */
581 if (vflag > 1) {
582 if (cp < snapend && nscount--) {
583 fputs(" ns:", stdout);
584 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
585 goto trunc;
586 while (cp < snapend && nscount--) {
587 putchar(',');
588 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
589 goto trunc;
590 }
591 }
592 if (nscount > 0)
593 goto trunc;
594 if (cp < snapend && arcount--) {
595 fputs(" ar:", stdout);
596 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
597 goto trunc;
598 while (cp < snapend && arcount--) {
599 putchar(',');
600 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
601 goto trunc;
602 }
603 }
604 if (arcount > 0)
605 goto trunc;
606 }
607 }
608 else {
609 /* this is a request */
610 printf(" %d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
611 DNS_RD(np) ? "+" : "",
612 DNS_CD(np) ? "%" : "");
613
614 /* any weirdness? */
615 b2 = EXTRACT_16BITS(((u_short *)np)+1);
616 if (b2 & 0x6cf)
617 printf(" [b2&3=0x%x]", b2);
618
619 if (DNS_OPCODE(np) == IQUERY) {
620 if (qdcount)
621 printf(" [%dq]", qdcount);
622 if (ancount != 1)
623 printf(" [%da]", ancount);
624 }
625 else {
626 if (ancount)
627 printf(" [%da]", ancount);
628 if (qdcount != 1)
629 printf(" [%dq]", qdcount);
630 }
631 if (nscount)
632 printf(" [%dn]", nscount);
633 if (arcount)
634 printf(" [%dau]", arcount);
635
636 cp = (const u_char *)(np + 1);
637 if (qdcount--) {
638 cp = ns_qprint(cp, (const u_char *)np, is_mdns);
639 if (!cp)
640 goto trunc;
641 while (cp < snapend && qdcount--) {
642 cp = ns_qprint((const u_char *)cp,
643 (const u_char *)np,
644 is_mdns);
645 if (!cp)
646 goto trunc;
647 }
648 }
649 if (qdcount > 0)
650 goto trunc;
651
652 /* Print remaining sections on -vv */
653 if (vflag > 1) {
654 if (ancount--) {
655 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
656 goto trunc;
657 while (cp < snapend && ancount--) {
658 putchar(',');
659 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
660 goto trunc;
661 }
662 }
663 if (ancount > 0)
664 goto trunc;
665 if (cp < snapend && nscount--) {
666 fputs(" ns:", stdout);
667 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
668 goto trunc;
669 while (nscount-- && cp < snapend) {
670 putchar(',');
671 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
672 goto trunc;
673 }
674 }
675 if (nscount > 0)
676 goto trunc;
677 if (cp < snapend && arcount--) {
678 fputs(" ar:", stdout);
679 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
680 goto trunc;
681 while (cp < snapend && arcount--) {
682 putchar(',');
683 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
684 goto trunc;
685 }
686 }
687 if (arcount > 0)
688 goto trunc;
689 }
690 }
691 printf(" (%d)", length);
692 return;
693
694 trunc:
695 printf("[|domain]");
696 return;
697 }
DragonFly BSD