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[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[] =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.53 2000-10-03 09:13:25 guy Exp $ (LBL)";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/socket.h>
34
35 struct mbuf;
36 struct rtentry;
37
38 #include <netinet/in.h>
39
40 #ifdef NOERROR
41 #undef NOERROR /* Solaris sucks */
42 #endif
43 #ifdef NOERROR
44 #undef T_UNSPEC /* SINIX does too */
45 #endif
46 #include "nameser.h"
47
48 #include <stdio.h>
49 #include <string.h>
50
51 #include "interface.h"
52 #include "addrtoname.h"
53 #include "extract.h" /* must come after interface.h */
54
55 /* Compatibility */
56 #ifndef T_TXT
57 #define T_TXT 16 /* text strings */
58 #endif
59 #ifndef T_RP
60 #define T_RP 17 /* responsible person */
61 #endif
62 #ifndef T_AFSDB
63 #define T_AFSDB 18 /* AFS cell database */
64 #endif
65 #ifndef T_X25
66 #define T_X25 19 /* X_25 calling address */
67 #endif
68 #ifndef T_ISDN
69 #define T_ISDN 20 /* ISDN calling address */
70 #endif
71 #ifndef T_RT
72 #define T_RT 21 /* router */
73 #endif
74 #ifndef T_NSAP
75 #define T_NSAP 22 /* NSAP address */
76 #endif
77 #ifndef T_NSAP_PTR
78 #define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */
79 #endif
80 #ifndef T_SIG
81 #define T_SIG 24 /* security signature */
82 #endif
83 #ifndef T_KEY
84 #define T_KEY 25 /* security key */
85 #endif
86 #ifndef T_PX
87 #define T_PX 26 /* X.400 mail mapping */
88 #endif
89 #ifndef T_GPOS
90 #define T_GPOS 27 /* geographical position (withdrawn) */
91 #endif
92 #ifndef T_AAAA
93 #define T_AAAA 28 /* IP6 Address */
94 #endif
95 #ifndef T_LOC
96 #define T_LOC 29 /* Location Information */
97 #endif
98 #ifndef T_NXT
99 #define T_NXT 30 /* Next Valid Name in Zone */
100 #endif
101 #ifndef T_EID
102 #define T_EID 31 /* Endpoint identifier */
103 #endif
104 #ifndef T_NIMLOC
105 #define T_NIMLOC 32 /* Nimrod locator */
106 #endif
107 #ifndef T_SRV
108 #define T_SRV 33 /* Server selection */
109 #endif
110 #ifndef T_ATMA
111 #define T_ATMA 34 /* ATM Address */
112 #endif
113 #ifndef T_NAPTR
114 #define T_NAPTR 35 /* Naming Authority PoinTeR */
115 #endif
116 #ifndef T_A6
117 #define T_A6 38 /* IP6 address (ipngwg-dns-lookups) */
118 #endif
119
120 #ifndef T_UNSPEC
121 #define T_UNSPEC 103 /* Unspecified format (binary data) */
122 #endif
123 #ifndef T_UNSPECA
124 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */
125 #endif
126
127 #ifndef C_CHAOS
128 #define C_CHAOS 3 /* for chaos net (MIT) */
129 #endif
130 #ifndef C_HS
131 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
132 #endif
133
134 static char *ns_ops[] = {
135 "", " inv_q", " stat", " op3", " notify", " op5", " op6", " op7",
136 " op8", " updataA", " updateD", " updateDA",
137 " updateM", " updateMA", " zoneInit", " zoneRef",
138 };
139
140 static char *ns_resp[] = {
141 "", " FormErr", " ServFail", " NXDomain",
142 " NotImp", " Refused", " Resp6", " Resp7",
143 " Resp8", " Resp9", " Resp10", " Resp11",
144 " Resp12", " Resp13", " Resp14", " NoChange",
145 };
146
147 /* skip over a domain name */
148 static const u_char *
149 ns_nskip(register const u_char *cp, register const u_char *bp)
150 {
151 register u_char i;
152
153 if (((i = *cp++) & INDIR_MASK) == INDIR_MASK)
154 return (cp + 1);
155 while (i && cp < snapend) {
156 cp += i;
157 i = *cp++;
158 }
159 return (cp);
160 }
161
162 /* print a <domain-name> */
163 static const u_char *
164 ns_nprint(register const u_char *cp, register const u_char *bp)
165 {
166 register u_int i;
167 register const u_char *rp;
168 register int compress;
169 int chars_processed;
170 int data_size = snapend - bp;
171
172 i = *cp++;
173 chars_processed = 1;
174 rp = cp + i;
175 if ((i & INDIR_MASK) == INDIR_MASK) {
176 rp = cp + 1;
177 compress = 1;
178 } else
179 compress = 0;
180 if (i != 0)
181 while (i && cp < snapend) {
182 if ((i & INDIR_MASK) == INDIR_MASK) {
183 cp = bp + (((i << 8) | *cp) & 0x3fff);
184 i = *cp++;
185 chars_processed++;
186
187 /*
188 * If we've looked at every character in
189 * the message, this pointer will make
190 * us look at some character again,
191 * which means we're looping.
192 */
193 if (chars_processed >= data_size) {
194 fn_printn(cp, 6, (u_char *)"<LOOP>");
195 if (!compress)
196 rp += i + 1;
197 return (rp);
198 }
199 continue;
200 }
201 if (fn_printn(cp, i, snapend))
202 break;
203 cp += i;
204 chars_processed += i;
205 putchar('.');
206 i = *cp++;
207 chars_processed++;
208 if (!compress)
209 rp += i + 1;
210 }
211 else
212 putchar('.');
213 return (rp);
214 }
215
216 /* print a <character-string> */
217 static const u_char *
218 ns_cprint(register const u_char *cp, register const u_char *bp)
219 {
220 register u_int i;
221
222 i = *cp++;
223 (void)fn_printn(cp, i, snapend);
224 return (cp + i);
225 }
226
227 static struct tok type2str[] = {
228 { T_A, "A" },
229 { T_NS, "NS" },
230 { T_MD, "MD" },
231 { T_MF, "MF" },
232 { T_CNAME, "CNAME" },
233 { T_SOA, "SOA" },
234 { T_MB, "MB" },
235 { T_MG, "MG" },
236 { T_MR, "MR" },
237 { T_NULL, "NULL" },
238 { T_WKS, "WKS" },
239 { T_PTR, "PTR" },
240 { T_HINFO, "HINFO" },
241 { T_MINFO, "MINFO" },
242 { T_MX, "MX" },
243 { T_TXT, "TXT" },
244 { T_RP, "RP" },
245 { T_AFSDB, "AFSDB" },
246 { T_X25, "X25" },
247 { T_ISDN, "ISDN" },
248 { T_RT, "RT" },
249 { T_NSAP, "NSAP" },
250 { T_NSAP_PTR, "NSAP_PTR" },
251 { T_SIG, "SIG" },
252 { T_KEY, "KEY" },
253 { T_PX, "PX" },
254 { T_GPOS, "GPOS" },
255 { T_AAAA, "AAAA" },
256 { T_LOC, "LOC " },
257 { T_NXT, "NXT " },
258 { T_EID, "EID " },
259 { T_NIMLOC, "NIMLOC " },
260 { T_SRV, "SRV " },
261 { T_ATMA, "ATMA " },
262 { T_NAPTR, "NAPTR " },
263 { T_A6, "A6 " },
264 #ifndef T_UINFO
265 #define T_UINFO 100
266 #endif
267 { T_UINFO, "UINFO" },
268 #ifndef T_UID
269 #define T_UID 101
270 #endif
271 { T_UID, "UID" },
272 #ifndef T_GID
273 #define T_GID 102
274 #endif
275 { T_GID, "GID" },
276 { T_UNSPEC, "UNSPEC" },
277 { T_UNSPECA, "UNSPECA" },
278 { T_AXFR, "AXFR" },
279 { T_MAILB, "MAILB" },
280 { T_MAILA, "MAILA" },
281 { T_ANY, "ANY" },
282 { 0, NULL }
283 };
284
285 static struct tok class2str[] = {
286 { C_IN, "IN" }, /* Not used */
287 { C_CHAOS, "CHAOS)" },
288 { C_HS, "HS" },
289 { C_ANY, "ANY" },
290 { 0, NULL }
291 };
292
293 /* print a query */
294 static void
295 ns_qprint(register const u_char *cp, register const u_char *bp)
296 {
297 register const u_char *np = cp;
298 register u_int i;
299
300 cp = ns_nskip(cp, bp);
301
302 if (cp + 4 > snapend)
303 return;
304
305 /* print the qtype and qclass (if it's not IN) */
306 i = *cp++ << 8;
307 i |= *cp++;
308 printf(" %s", tok2str(type2str, "Type%d", i));
309 i = *cp++ << 8;
310 i |= *cp++;
311 if (i != C_IN)
312 printf(" %s", tok2str(class2str, "(Class %d)", i));
313
314 fputs("? ", stdout);
315 ns_nprint(np, bp);
316 }
317
318 /* print a reply */
319 static const u_char *
320 ns_rprint(register const u_char *cp, register const u_char *bp)
321 {
322 register u_int i;
323 register u_short typ, len;
324 register const u_char *rp;
325
326 if (vflag) {
327 putchar(' ');
328 cp = ns_nprint(cp, bp);
329 } else
330 cp = ns_nskip(cp, bp);
331
332 if (cp + 10 > snapend)
333 return (snapend);
334
335 /* print the type/qtype and class (if it's not IN) */
336 typ = *cp++ << 8;
337 typ |= *cp++;
338 i = *cp++ << 8;
339 i |= *cp++;
340 if (i != C_IN)
341 printf(" %s", tok2str(class2str, "(Class %d)", i));
342
343 /* ignore ttl */
344 cp += 4;
345
346 len = *cp++ << 8;
347 len |= *cp++;
348
349 rp = cp + len;
350
351 printf(" %s", tok2str(type2str, "Type%d", typ));
352 switch (typ) {
353
354 case T_A:
355 printf(" %s", ipaddr_string(cp));
356 break;
357
358 case T_NS:
359 case T_CNAME:
360 case T_PTR:
361 #ifdef T_DNAME
362 case T_DNAME: /*XXX not checked as there's no server support yet*/
363 #endif
364 putchar(' ');
365 (void)ns_nprint(cp, bp);
366 break;
367
368 case T_MX:
369 putchar(' ');
370 (void)ns_nprint(cp + 2, bp);
371 printf(" %d", EXTRACT_16BITS(cp));
372 break;
373
374 case T_TXT:
375 putchar(' ');
376 (void)ns_cprint(cp, bp);
377 break;
378
379 #ifdef INET6
380 case T_AAAA:
381 printf(" %s", ip6addr_string(cp));
382 break;
383
384 case T_A6: /*XXX not checked as there's no server support yet*/
385 {
386 struct in6_addr a;
387 int pbyte;
388
389 pbyte = (*cp + 7) / 8;
390 memset(&a, 0, sizeof(a));
391 memcpy(&a, cp + 1, pbyte);
392 printf(" %u %s ", *cp, ip6addr_string(&a));
393 (void)ns_nprint(cp + 1 + pbyte, bp);
394 break;
395 }
396 #endif /*INET6*/
397
398 case T_UNSPECA: /* One long string */
399 printf(" %.*s", len, cp);
400 break;
401 }
402 return (rp); /* XXX This isn't always right */
403 }
404
405 void
406 ns_print(register const u_char *bp, u_int length)
407 {
408 register const HEADER *np;
409 register int qdcount, ancount, nscount, arcount;
410 register const u_char *cp;
411
412 np = (const HEADER *)bp;
413 /* get the byte-order right */
414 qdcount = ntohs(np->qdcount);
415 ancount = ntohs(np->ancount);
416 nscount = ntohs(np->nscount);
417 arcount = ntohs(np->arcount);
418
419 if (DNS_QR(np)) {
420 /* this is a response */
421 printf(" %d%s%s%s%s%s%s",
422 ntohs(np->id),
423 ns_ops[DNS_OPCODE(np)],
424 ns_resp[DNS_RCODE(np)],
425 DNS_AA(np)? "*" : "",
426 DNS_RA(np)? "" : "-",
427 DNS_TC(np)? "|" : "",
428 DNS_CD(np)? "%" : "");
429
430 if (qdcount != 1)
431 printf(" [%dq]", qdcount);
432 /* Print QUESTION section on -vv */
433 if (vflag > 1) {
434 fputs(" q: ", stdout);
435 cp = ns_nprint((const u_char *)(np + 1), bp);
436 } else
437 cp = ns_nskip((const u_char *)(np + 1), bp);
438 printf(" %d/%d/%d", ancount, nscount, arcount);
439 if (ancount--) {
440 cp = ns_rprint(cp + 4, bp);
441 while (ancount-- && cp < snapend) {
442 putchar(',');
443 cp = ns_rprint(cp, bp);
444 }
445 }
446 }
447 else {
448 /* this is a request */
449 printf(" %d%s%s%s",
450 ntohs(np->id),
451 ns_ops[DNS_OPCODE(np)],
452 DNS_RD(np)? "+" : "",
453 DNS_AD(np)? "$" : "");
454
455 /* any weirdness? */
456 if (*(((u_short *)np)+1) & htons(0x6cf))
457 printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1)));
458
459 if (DNS_OPCODE(np) == IQUERY) {
460 if (qdcount)
461 printf(" [%dq]", qdcount);
462 if (ancount != 1)
463 printf(" [%da]", ancount);
464 }
465 else {
466 if (ancount)
467 printf(" [%da]", ancount);
468 if (qdcount != 1)
469 printf(" [%dq]", qdcount);
470 }
471 if (nscount)
472 printf(" [%dn]", nscount);
473 if (arcount)
474 printf(" [%dau]", arcount);
475
476 ns_qprint((const u_char *)(np + 1), (const u_char *)np);
477 }
478 printf(" (%d)", length);
479 }
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