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
--- 4 unchanged lines hidden (view full) ---
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 127675 2004-03-31 14:57:24Z bms $
22 */
23
24#ifndef lint
25static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.86.2.3 2004/03/28 20:54:00 fenner 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 */
--- 8 unchanged lines hidden (view full) ---
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)
--- 9 unchanged lines hidden (view full) ---
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))
--- 18 unchanged lines hidden (view full) ---
150{
151 register u_int i, l;
152 register const u_char *rp = NULL;
153 register int compress = 0;
154 int chars_processed;
155 int elt;
156 int data_size = snapend - bp;
157
158 if ((l = labellen(cp)) == (u_int)-1)
159 return(NULL);
160 if (!TTEST2(*cp, 1))
161 return(NULL);
162 chars_processed = 1;
163 if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
164 compress = 0;
165 rp = cp + l;
166 }
167
168 if (i != 0)
169 while (i && cp < snapend) {
170 if ((i & INDIR_MASK) == INDIR_MASK) {
171 if (!compress) {
172 rp = cp + 1;
173 compress = 1;
174 }
175 if (!TTEST2(*cp, 1))
176 return(NULL);
177 cp = bp + (((i << 8) | *cp) & 0x3fff);
178 if ((l = labellen(cp)) == (u_int)-1)
179 return(NULL);
180 if (!TTEST2(*cp, 1))
181 return(NULL);
182 i = *cp++;
183 chars_processed++;
184
185 /*
186 * If we've looked at every character in
--- 22 unchanged lines hidden (view full) ---
209 } else {
210 if (fn_printn(cp, l, snapend))
211 return(NULL);
212 }
213
214 cp += l;
215 chars_processed += l;
216 putchar('.');
217 if ((l = labellen(cp)) == (u_int)-1)
218 return(NULL);
219 if (!TTEST2(*cp, 1))
220 return(NULL);
221 i = *cp++;
222 chars_processed++;
223 if (!compress)
224 rp += l + 1;
225 }
226 else
227 putchar('.');
228 return (rp);
229}
230
231/* print a <character-string> */
232static const u_char *
233ns_cprint(register const u_char *cp)
234{
235 register u_int i;
236
237 if (!TTEST2(*cp, 1))
238 return (NULL);
239 i = *cp++;
240 if (fn_printn(cp, i, snapend))
241 return (NULL);
242 return (cp + i);
243}
244
245/* http://www.iana.org/assignments/dns-parameters */
246struct tok ns_type2str[] = {
247 { T_A, "A" }, /* RFC 1035 */
248 { T_NS, "NS" }, /* RFC 1035 */
249 { T_MD, "MD" }, /* RFC 1035 */
250 { T_MF, "MF" }, /* RFC 1035 */
251 { T_CNAME, "CNAME" }, /* RFC 1035 */
252 { T_SOA, "SOA" }, /* RFC 1035 */
253 { T_MB, "MB" }, /* RFC 1035 */
254 { T_MG, "MG" }, /* RFC 1035 */
255 { T_MR, "MR" }, /* RFC 1035 */
256 { T_NULL, "NULL" }, /* RFC 1035 */
257 { T_WKS, "WKS" }, /* RFC 1035 */
258 { T_PTR, "PTR" }, /* RFC 1035 */
259 { T_HINFO, "HINFO" }, /* RFC 1035 */
260 { T_MINFO, "MINFO" }, /* RFC 1035 */
261 { T_MX, "MX" }, /* RFC 1035 */
262 { T_TXT, "TXT" }, /* RFC 1035 */
263 { T_RP, "RP" }, /* RFC 1183 */
264 { T_AFSDB, "AFSDB" }, /* RFC 1183 */
265 { T_X25, "X25" }, /* RFC 1183 */
266 { T_ISDN, "ISDN" }, /* RFC 1183 */
267 { T_RT, "RT" }, /* RFC 1183 */
268 { T_NSAP, "NSAP" }, /* RFC 1706 */
269 { T_NSAP_PTR, "NSAP_PTR" },
270 { T_SIG, "SIG" }, /* RFC 2535 */
271 { T_KEY, "KEY" }, /* RFC 2535 */
272 { T_PX, "PX" }, /* RFC 2163 */
273 { T_GPOS, "GPOS" }, /* RFC 1712 */
274 { T_AAAA, "AAAA" }, /* RFC 1886 */
275 { T_LOC, "LOC" }, /* RFC 1876 */
276 { T_NXT, "NXT" }, /* RFC 2535 */
277 { T_EID, "EID" }, /* Nimrod */
278 { T_NIMLOC, "NIMLOC" }, /* Nimrod */
279 { T_SRV, "SRV" }, /* RFC 2782 */
280 { T_ATMA, "ATMA" }, /* ATM Forum */
281 { T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */
282 { T_A6, "A6" }, /* RFC 2874 */
283 { T_DNAME, "DNAME" }, /* RFC 2672 */
284 { T_OPT, "OPT" }, /* RFC 2671 */
285 { T_UINFO, "UINFO" },
286 { T_UID, "UID" },
287 { T_GID, "GID" },
288 { T_UNSPEC, "UNSPEC" },
289 { T_UNSPECA, "UNSPECA" },
290 { T_TKEY, "TKEY" }, /* RFC 2930 */
291 { T_TSIG, "TSIG" }, /* RFC 2845 */
292 { T_IXFR, "IXFR" }, /* RFC 1995 */
293 { T_AXFR, "AXFR" }, /* RFC 1035 */
294 { T_MAILB, "MAILB" }, /* RFC 1035 */
295 { T_MAILA, "MAILA" }, /* RFC 1035 */
296 { T_ANY, "ANY" },
297 { 0, NULL }
298};
299
300struct tok ns_class2str[] = {
301 { C_IN, "IN" }, /* Not used */
302 { C_CHAOS, "CHAOS" },
303 { C_HS, "HS" },
304 { C_ANY, "ANY" },
305 { 0, NULL }
306};
307
308/* print a query */
309static const u_char *
310ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
311{
312 register const u_char *np = cp;
313 register u_int i;
314
315 cp = ns_nskip(cp);
316
317 if (cp == NULL || !TTEST2(*cp, 4))
318 return(NULL);
319
320 /* print the qtype and qclass (if it's not IN) */
321 i = EXTRACT_16BITS(cp);
322 cp += 2;
323 printf(" %s", tok2str(ns_type2str, "Type%d", i));
324 i = EXTRACT_16BITS(cp);
325 cp += 2;
326 if (is_mdns && i == (C_IN|C_CACHE_FLUSH))
327 printf(" (Cache flush)");
328 else if (i != C_IN)
329 printf(" %s", tok2str(ns_class2str, "(Class %d)", i));
330
331 fputs("? ", stdout);
332 cp = ns_nprint(np, bp);
333 return(cp ? cp + 4 : NULL);
334}
335
336/* print a reply */
337static const u_char *
338ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
339{
340 register u_int class;
341 register u_short typ, len;
342 register const u_char *rp;
343
344 if (vflag) {
345 putchar(' ');
346 if ((cp = ns_nprint(cp, bp)) == NULL)
347 return NULL;
348 } else
349 cp = ns_nskip(cp);
350
351 if (cp == NULL || !TTEST2(*cp, 10))
352 return (snapend);
353
354 /* print the type/qtype and class (if it's not IN) */
355 typ = EXTRACT_16BITS(cp);
356 cp += 2;
357 class = EXTRACT_16BITS(cp);
358 cp += 2;
359 if (is_mdns && class == (C_IN|C_CACHE_FLUSH))
360 printf(" (Cache flush)");
361 else if (class != C_IN && typ != T_OPT)
362 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
363
364 /* ignore ttl */
365 cp += 4;
366
367 len = EXTRACT_16BITS(cp);
368 cp += 2;
369
370 rp = cp + len;
371
372 printf(" %s", tok2str(ns_type2str, "Type%d", typ));
373 if (rp > snapend)
374 return(NULL);
375
376 switch (typ) {
--- 41 unchanged lines hidden (view full) ---
418 if (!TTEST2(*cp, 2))
419 return(NULL);
420 if (ns_nprint(cp + 2, bp) == NULL)
421 return(NULL);
422 printf(" %d", EXTRACT_16BITS(cp));
423 break;
424
425 case T_TXT:
426 while (cp < rp) {
427 printf(" \"");
428 cp = ns_cprint(cp);
429 if (cp == NULL)
430 return(NULL);
431 putchar('"');
432 }
433 break;
434
435 case T_SRV:
436 putchar(' ');
437 if (!TTEST2(*cp, 6))
438 return(NULL);
439 if (ns_nprint(cp + 6, bp) == NULL)
440 return(NULL);
441 printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
442 EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
443 break;
444
445#ifdef INET6
446 case T_AAAA:
447 if (!TTEST2(*cp, sizeof(struct in6_addr)))
448 return(NULL);
449 printf(" %s", ip6addr_string(cp));
450 break;
--- 68 unchanged lines hidden (view full) ---
519 printf(" otherlen=%u", EXTRACT_16BITS(cp));
520 cp += 2;
521 }
522 }
523 return (rp); /* XXX This isn't always right */
524}
525
526void
527ns_print(register const u_char *bp, u_int length, int is_mdns)
528{
529 register const HEADER *np;
530 register int qdcount, ancount, nscount, arcount;
531 register const u_char *cp;
532 u_int16_t b2;
533
534 np = (const HEADER *)bp;
535 TCHECK(*np);
536 /* get the byte-order right */
537 qdcount = EXTRACT_16BITS(&np->qdcount);
538 ancount = EXTRACT_16BITS(&np->ancount);
539 nscount = EXTRACT_16BITS(&np->nscount);
540 arcount = EXTRACT_16BITS(&np->arcount);
541
542 if (DNS_QR(np)) {
543 /* this is a response */
544 printf(" %d%s%s%s%s%s%s",
545 EXTRACT_16BITS(&np->id),
546 ns_ops[DNS_OPCODE(np)],
547 ns_resp[DNS_RCODE(np)],
548 DNS_AA(np)? "*" : "",
549 DNS_RA(np)? "" : "-",
550 DNS_TC(np)? "|" : "",
551 DNS_AD(np)? "$" : "");
552
553 if (qdcount != 1)
554 printf(" [%dq]", qdcount);
555 /* Print QUESTION section on -vv */
556 cp = (const u_char *)(np + 1);
557 while (qdcount--) {
558 if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
559 putchar(',');
560 if (vflag > 1) {
561 fputs(" q:", stdout);
562 if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
563 goto trunc;
564 } else {
565 if ((cp = ns_nskip(cp)) == NULL)
566 goto trunc;
567 cp += 4; /* skip QTYPE and QCLASS */
568 }
569 }
570 printf(" %d/%d/%d", ancount, nscount, arcount);
571 if (ancount--) {
572 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
573 goto trunc;
574 while (cp < snapend && ancount--) {
575 putchar(',');
576 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
577 goto trunc;
578 }
579 }
580 if (ancount > 0)
581 goto trunc;
582 /* Print NS and AR sections on -vv */
583 if (vflag > 1) {
584 if (cp < snapend && nscount--) {
585 fputs(" ns:", stdout);
586 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
587 goto trunc;
588 while (cp < snapend && nscount--) {
589 putchar(',');
590 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
591 goto trunc;
592 }
593 }
594 if (nscount > 0)
595 goto trunc;
596 if (cp < snapend && arcount--) {
597 fputs(" ar:", stdout);
598 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
599 goto trunc;
600 while (cp < snapend && arcount--) {
601 putchar(',');
602 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
603 goto trunc;
604 }
605 }
606 if (arcount > 0)
607 goto trunc;
608 }
609 }
610 else {
611 /* this is a request */
612 printf(" %d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
613 DNS_RD(np) ? "+" : "",
614 DNS_CD(np) ? "%" : "");
615
616 /* any weirdness? */
617 b2 = EXTRACT_16BITS(((u_short *)np)+1);
618 if (b2 & 0x6cf)
619 printf(" [b2&3=0x%x]", b2);
620
621 if (DNS_OPCODE(np) == IQUERY) {
622 if (qdcount)
623 printf(" [%dq]", qdcount);
624 if (ancount != 1)
625 printf(" [%da]", ancount);
626 }
627 else {
--- 4 unchanged lines hidden (view full) ---
632 }
633 if (nscount)
634 printf(" [%dn]", nscount);
635 if (arcount)
636 printf(" [%dau]", arcount);
637
638 cp = (const u_char *)(np + 1);
639 if (qdcount--) {
640 cp = ns_qprint(cp, (const u_char *)np, is_mdns);
641 if (!cp)
642 goto trunc;
643 while (cp < snapend && qdcount--) {
644 cp = ns_qprint((const u_char *)cp,
645 (const u_char *)np,
646 is_mdns);
647 if (!cp)
648 goto trunc;
649 }
650 }
651 if (qdcount > 0)
652 goto trunc;
653
654 /* Print remaining sections on -vv */
655 if (vflag > 1) {
656 if (ancount--) {
657 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
658 goto trunc;
659 while (cp < snapend && ancount--) {
660 putchar(',');
661 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
662 goto trunc;
663 }
664 }
665 if (ancount > 0)
666 goto trunc;
667 if (cp < snapend && nscount--) {
668 fputs(" ns:", stdout);
669 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
670 goto trunc;
671 while (nscount-- && cp < snapend) {
672 putchar(',');
673 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
674 goto trunc;
675 }
676 }
677 if (nscount > 0)
678 goto trunc;
679 if (cp < snapend && arcount--) {
680 fputs(" ar:", stdout);
681 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
682 goto trunc;
683 while (cp < snapend && arcount--) {
684 putchar(',');
685 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
686 goto trunc;
687 }
688 }
689 if (arcount > 0)
690 goto trunc;
691 }
692 }
693 printf(" (%d)", length);
694 return;
695
696 trunc:
697 printf("[|domain]");
698 return;
699}
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
--- 4 unchanged lines hidden (view full) ---
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 127675 2004-03-31 14:57:24Z bms $
22 */
23
24#ifndef lint
25static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.86.2.3 2004/03/28 20:54:00 fenner 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 */
--- 8 unchanged lines hidden (view full) ---
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)
--- 9 unchanged lines hidden (view full) ---
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))
--- 18 unchanged lines hidden (view full) ---
150{
151 register u_int i, l;
152 register const u_char *rp = NULL;
153 register int compress = 0;
154 int chars_processed;
155 int elt;
156 int data_size = snapend - bp;
157
158 if ((l = labellen(cp)) == (u_int)-1)
159 return(NULL);
160 if (!TTEST2(*cp, 1))
161 return(NULL);
162 chars_processed = 1;
163 if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
164 compress = 0;
165 rp = cp + l;
166 }
167
168 if (i != 0)
169 while (i && cp < snapend) {
170 if ((i & INDIR_MASK) == INDIR_MASK) {
171 if (!compress) {
172 rp = cp + 1;
173 compress = 1;
174 }
175 if (!TTEST2(*cp, 1))
176 return(NULL);
177 cp = bp + (((i << 8) | *cp) & 0x3fff);
178 if ((l = labellen(cp)) == (u_int)-1)
179 return(NULL);
180 if (!TTEST2(*cp, 1))
181 return(NULL);
182 i = *cp++;
183 chars_processed++;
184
185 /*
186 * If we've looked at every character in
--- 22 unchanged lines hidden (view full) ---
209 } else {
210 if (fn_printn(cp, l, snapend))
211 return(NULL);
212 }
213
214 cp += l;
215 chars_processed += l;
216 putchar('.');
217 if ((l = labellen(cp)) == (u_int)-1)
218 return(NULL);
219 if (!TTEST2(*cp, 1))
220 return(NULL);
221 i = *cp++;
222 chars_processed++;
223 if (!compress)
224 rp += l + 1;
225 }
226 else
227 putchar('.');
228 return (rp);
229}
230
231/* print a <character-string> */
232static const u_char *
233ns_cprint(register const u_char *cp)
234{
235 register u_int i;
236
237 if (!TTEST2(*cp, 1))
238 return (NULL);
239 i = *cp++;
240 if (fn_printn(cp, i, snapend))
241 return (NULL);
242 return (cp + i);
243}
244
245/* http://www.iana.org/assignments/dns-parameters */
246struct tok ns_type2str[] = {
247 { T_A, "A" }, /* RFC 1035 */
248 { T_NS, "NS" }, /* RFC 1035 */
249 { T_MD, "MD" }, /* RFC 1035 */
250 { T_MF, "MF" }, /* RFC 1035 */
251 { T_CNAME, "CNAME" }, /* RFC 1035 */
252 { T_SOA, "SOA" }, /* RFC 1035 */
253 { T_MB, "MB" }, /* RFC 1035 */
254 { T_MG, "MG" }, /* RFC 1035 */
255 { T_MR, "MR" }, /* RFC 1035 */
256 { T_NULL, "NULL" }, /* RFC 1035 */
257 { T_WKS, "WKS" }, /* RFC 1035 */
258 { T_PTR, "PTR" }, /* RFC 1035 */
259 { T_HINFO, "HINFO" }, /* RFC 1035 */
260 { T_MINFO, "MINFO" }, /* RFC 1035 */
261 { T_MX, "MX" }, /* RFC 1035 */
262 { T_TXT, "TXT" }, /* RFC 1035 */
263 { T_RP, "RP" }, /* RFC 1183 */
264 { T_AFSDB, "AFSDB" }, /* RFC 1183 */
265 { T_X25, "X25" }, /* RFC 1183 */
266 { T_ISDN, "ISDN" }, /* RFC 1183 */
267 { T_RT, "RT" }, /* RFC 1183 */
268 { T_NSAP, "NSAP" }, /* RFC 1706 */
269 { T_NSAP_PTR, "NSAP_PTR" },
270 { T_SIG, "SIG" }, /* RFC 2535 */
271 { T_KEY, "KEY" }, /* RFC 2535 */
272 { T_PX, "PX" }, /* RFC 2163 */
273 { T_GPOS, "GPOS" }, /* RFC 1712 */
274 { T_AAAA, "AAAA" }, /* RFC 1886 */
275 { T_LOC, "LOC" }, /* RFC 1876 */
276 { T_NXT, "NXT" }, /* RFC 2535 */
277 { T_EID, "EID" }, /* Nimrod */
278 { T_NIMLOC, "NIMLOC" }, /* Nimrod */
279 { T_SRV, "SRV" }, /* RFC 2782 */
280 { T_ATMA, "ATMA" }, /* ATM Forum */
281 { T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */
282 { T_A6, "A6" }, /* RFC 2874 */
283 { T_DNAME, "DNAME" }, /* RFC 2672 */
284 { T_OPT, "OPT" }, /* RFC 2671 */
285 { T_UINFO, "UINFO" },
286 { T_UID, "UID" },
287 { T_GID, "GID" },
288 { T_UNSPEC, "UNSPEC" },
289 { T_UNSPECA, "UNSPECA" },
290 { T_TKEY, "TKEY" }, /* RFC 2930 */
291 { T_TSIG, "TSIG" }, /* RFC 2845 */
292 { T_IXFR, "IXFR" }, /* RFC 1995 */
293 { T_AXFR, "AXFR" }, /* RFC 1035 */
294 { T_MAILB, "MAILB" }, /* RFC 1035 */
295 { T_MAILA, "MAILA" }, /* RFC 1035 */
296 { T_ANY, "ANY" },
297 { 0, NULL }
298};
299
300struct tok ns_class2str[] = {
301 { C_IN, "IN" }, /* Not used */
302 { C_CHAOS, "CHAOS" },
303 { C_HS, "HS" },
304 { C_ANY, "ANY" },
305 { 0, NULL }
306};
307
308/* print a query */
309static const u_char *
310ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
311{
312 register const u_char *np = cp;
313 register u_int i;
314
315 cp = ns_nskip(cp);
316
317 if (cp == NULL || !TTEST2(*cp, 4))
318 return(NULL);
319
320 /* print the qtype and qclass (if it's not IN) */
321 i = EXTRACT_16BITS(cp);
322 cp += 2;
323 printf(" %s", tok2str(ns_type2str, "Type%d", i));
324 i = EXTRACT_16BITS(cp);
325 cp += 2;
326 if (is_mdns && i == (C_IN|C_CACHE_FLUSH))
327 printf(" (Cache flush)");
328 else if (i != C_IN)
329 printf(" %s", tok2str(ns_class2str, "(Class %d)", i));
330
331 fputs("? ", stdout);
332 cp = ns_nprint(np, bp);
333 return(cp ? cp + 4 : NULL);
334}
335
336/* print a reply */
337static const u_char *
338ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
339{
340 register u_int class;
341 register u_short typ, len;
342 register const u_char *rp;
343
344 if (vflag) {
345 putchar(' ');
346 if ((cp = ns_nprint(cp, bp)) == NULL)
347 return NULL;
348 } else
349 cp = ns_nskip(cp);
350
351 if (cp == NULL || !TTEST2(*cp, 10))
352 return (snapend);
353
354 /* print the type/qtype and class (if it's not IN) */
355 typ = EXTRACT_16BITS(cp);
356 cp += 2;
357 class = EXTRACT_16BITS(cp);
358 cp += 2;
359 if (is_mdns && class == (C_IN|C_CACHE_FLUSH))
360 printf(" (Cache flush)");
361 else if (class != C_IN && typ != T_OPT)
362 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
363
364 /* ignore ttl */
365 cp += 4;
366
367 len = EXTRACT_16BITS(cp);
368 cp += 2;
369
370 rp = cp + len;
371
372 printf(" %s", tok2str(ns_type2str, "Type%d", typ));
373 if (rp > snapend)
374 return(NULL);
375
376 switch (typ) {
--- 41 unchanged lines hidden (view full) ---
418 if (!TTEST2(*cp, 2))
419 return(NULL);
420 if (ns_nprint(cp + 2, bp) == NULL)
421 return(NULL);
422 printf(" %d", EXTRACT_16BITS(cp));
423 break;
424
425 case T_TXT:
426 while (cp < rp) {
427 printf(" \"");
428 cp = ns_cprint(cp);
429 if (cp == NULL)
430 return(NULL);
431 putchar('"');
432 }
433 break;
434
435 case T_SRV:
436 putchar(' ');
437 if (!TTEST2(*cp, 6))
438 return(NULL);
439 if (ns_nprint(cp + 6, bp) == NULL)
440 return(NULL);
441 printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
442 EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
443 break;
444
445#ifdef INET6
446 case T_AAAA:
447 if (!TTEST2(*cp, sizeof(struct in6_addr)))
448 return(NULL);
449 printf(" %s", ip6addr_string(cp));
450 break;
--- 68 unchanged lines hidden (view full) ---
519 printf(" otherlen=%u", EXTRACT_16BITS(cp));
520 cp += 2;
521 }
522 }
523 return (rp); /* XXX This isn't always right */
524}
525
526void
527ns_print(register const u_char *bp, u_int length, int is_mdns)
528{
529 register const HEADER *np;
530 register int qdcount, ancount, nscount, arcount;
531 register const u_char *cp;
532 u_int16_t b2;
533
534 np = (const HEADER *)bp;
535 TCHECK(*np);
536 /* get the byte-order right */
537 qdcount = EXTRACT_16BITS(&np->qdcount);
538 ancount = EXTRACT_16BITS(&np->ancount);
539 nscount = EXTRACT_16BITS(&np->nscount);
540 arcount = EXTRACT_16BITS(&np->arcount);
541
542 if (DNS_QR(np)) {
543 /* this is a response */
544 printf(" %d%s%s%s%s%s%s",
545 EXTRACT_16BITS(&np->id),
546 ns_ops[DNS_OPCODE(np)],
547 ns_resp[DNS_RCODE(np)],
548 DNS_AA(np)? "*" : "",
549 DNS_RA(np)? "" : "-",
550 DNS_TC(np)? "|" : "",
551 DNS_AD(np)? "$" : "");
552
553 if (qdcount != 1)
554 printf(" [%dq]", qdcount);
555 /* Print QUESTION section on -vv */
556 cp = (const u_char *)(np + 1);
557 while (qdcount--) {
558 if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
559 putchar(',');
560 if (vflag > 1) {
561 fputs(" q:", stdout);
562 if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
563 goto trunc;
564 } else {
565 if ((cp = ns_nskip(cp)) == NULL)
566 goto trunc;
567 cp += 4; /* skip QTYPE and QCLASS */
568 }
569 }
570 printf(" %d/%d/%d", ancount, nscount, arcount);
571 if (ancount--) {
572 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
573 goto trunc;
574 while (cp < snapend && ancount--) {
575 putchar(',');
576 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
577 goto trunc;
578 }
579 }
580 if (ancount > 0)
581 goto trunc;
582 /* Print NS and AR sections on -vv */
583 if (vflag > 1) {
584 if (cp < snapend && nscount--) {
585 fputs(" ns:", stdout);
586 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
587 goto trunc;
588 while (cp < snapend && nscount--) {
589 putchar(',');
590 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
591 goto trunc;
592 }
593 }
594 if (nscount > 0)
595 goto trunc;
596 if (cp < snapend && arcount--) {
597 fputs(" ar:", stdout);
598 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
599 goto trunc;
600 while (cp < snapend && arcount--) {
601 putchar(',');
602 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
603 goto trunc;
604 }
605 }
606 if (arcount > 0)
607 goto trunc;
608 }
609 }
610 else {
611 /* this is a request */
612 printf(" %d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
613 DNS_RD(np) ? "+" : "",
614 DNS_CD(np) ? "%" : "");
615
616 /* any weirdness? */
617 b2 = EXTRACT_16BITS(((u_short *)np)+1);
618 if (b2 & 0x6cf)
619 printf(" [b2&3=0x%x]", b2);
620
621 if (DNS_OPCODE(np) == IQUERY) {
622 if (qdcount)
623 printf(" [%dq]", qdcount);
624 if (ancount != 1)
625 printf(" [%da]", ancount);
626 }
627 else {
--- 4 unchanged lines hidden (view full) ---
632 }
633 if (nscount)
634 printf(" [%dn]", nscount);
635 if (arcount)
636 printf(" [%dau]", arcount);
637
638 cp = (const u_char *)(np + 1);
639 if (qdcount--) {
640 cp = ns_qprint(cp, (const u_char *)np, is_mdns);
641 if (!cp)
642 goto trunc;
643 while (cp < snapend && qdcount--) {
644 cp = ns_qprint((const u_char *)cp,
645 (const u_char *)np,
646 is_mdns);
647 if (!cp)
648 goto trunc;
649 }
650 }
651 if (qdcount > 0)
652 goto trunc;
653
654 /* Print remaining sections on -vv */
655 if (vflag > 1) {
656 if (ancount--) {
657 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
658 goto trunc;
659 while (cp < snapend && ancount--) {
660 putchar(',');
661 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
662 goto trunc;
663 }
664 }
665 if (ancount > 0)
666 goto trunc;
667 if (cp < snapend && nscount--) {
668 fputs(" ns:", stdout);
669 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
670 goto trunc;
671 while (nscount-- && cp < snapend) {
672 putchar(',');
673 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
674 goto trunc;
675 }
676 }
677 if (nscount > 0)
678 goto trunc;
679 if (cp < snapend && arcount--) {
680 fputs(" ar:", stdout);
681 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
682 goto trunc;
683 while (cp < snapend && arcount--) {
684 putchar(',');
685 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
686 goto trunc;
687 }
688 }
689 if (arcount > 0)
690 goto trunc;
691 }
692 }
693 printf(" (%d)", length);
694 return;
695
696 trunc:
697 printf("[|domain]");
698 return;
699}