1 /*
2 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
3 *
4 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
5 * Use is subject to license terms.
6 *
7 * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
8 * All Rights Reserved
9 *
10 * Portions of this source code were derived from Berkeley
11 * 4.3 BSD under license from the regents of the University of
12 * California.
13 */
14
15 /*
16 * BIND 4.9.4:
17 */
18
19 /*
20 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
21 *
22 * Permission to use, copy, modify, and distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies, and that
25 * the name of Digital Equipment Corporation not be used in advertising or
26 * publicity pertaining to distribution of the document or software without
27 * specific, written prior permission.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
30 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
32 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
33 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
34 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
35 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
36 * SOFTWARE.
37 * --Copyright--
38 *
39 * End BIND 4.9.4
40 */
41
42 /*
43 * Copyright (c) 1983, 1987, 1989
44 * The Regents of the University of California. All rights reserved.
45 *
46 * Redistribution and use in source and binary forms, with or without
47 * modification, are permitted provided that the following conditions
48 * are met:
49 * 1. Redistributions of source code must retain the above copyright
50 * notice, this list of conditions and the following disclaimer.
51 * 2. Redistributions in binary form must reproduce the above copyright
52 * notice, this list of conditions and the following disclaimer in the
53 * documentation and/or other materials provided with the distribution.
54 * 3. All advertising materials mentioning features or use of this software
55 * must display the following acknowledgement:
56 * This product includes software developed by the University of
57 * California, Berkeley and its contributors.
58 * 4. Neither the name of the University nor the names of its contributors
59 * may be used to endorse or promote products derived from this software
60 * without specific prior written permission.
61 *
62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
72 * SUCH DAMAGE.
73 */
74
75 /*
76 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
77 *
78 * Permission to use, copy, modify, and distribute this software for any
79 * purpose with or without fee is hereby granted, provided that the above
80 * copyright notice and this permission notice appear in all copies.
81 *
82 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
83 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
84 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
85 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
86 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
87 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
88 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
89 * SOFTWARE.
90 */
91
92 /*
93 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
94 * $Id: resolv.h,v 8.52 2003/04/29 02:27:03 marka Exp $
95 */
96
97 #ifndef _RESOLV_H_
98 #define _RESOLV_H_
99
100 #include <sys/param.h>
101
102 #include <stdio.h>
103 #include <arpa/nameser.h>
104 #include <sys/socket.h>
105
106 #ifdef __cplusplus
107 extern "C" {
108 #endif
109
110 /*
111 * Revision information. This is the release date in YYYYMMDD format.
112 * It can change every day so the right thing to do with it is use it
113 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
114 * compare for equality; rather, use it to determine whether your resolver
115 * is new enough to contain a certain feature.
116 */
117
118 #define __RES 20090302
119
120 #define RES_SET_H_ERRNO(r, x) __h_errno_set(r, x)
121 struct __res_state; /* forward */
122
123 void __h_errno_set(struct __res_state *res, int err);
124
125 /*
126 * Resolver configuration file.
127 * Normally not present, but may contain the address of the
128 * initial name server(s) to query and the domain search list.
129 */
130
131 #ifndef _PATH_RESCONF
132 #define _PATH_RESCONF "/etc/resolv.conf"
133 #endif
134
135 #ifndef __P
136 #define __P(x) x
137 #endif
138
139 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
140 res_sendhookact;
141
142 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr * const *ns,
143 const uchar_t **query,
144 int *querylen,
145 uchar_t *ans,
146 int anssiz,
147 int *resplen));
148
149 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr *ns,
150 const uchar_t *query,
151 int querylen,
152 uchar_t *ans,
153 int anssiz,
154 int *resplen));
155
156 struct res_sym {
157 int number; /* Identifying number, like T_MX */
158 const char *name; /* Its symbolic name, like "MX" */
159 const char *humanname; /* Its fun name, like "mail exchanger" */
160 };
161
162 /*
163 * Global defines and variables for resolver stub.
164 */
165 /* ADDRSORT and MAXADDR retained for compatibility; not used */
166 #define ADDRSORT 1 /* enable the address-sorting option */
167 #define MAXADDR 10 /* max # addresses to sort by */
168
169 #define MAXNS 3 /* max # name servers we'll track */
170 #define MAXDFLSRCH 3 /* # default domain levels to try */
171 #define MAXDNSRCH 6 /* max # domains in search path */
172 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
173
174 #define RES_TIMEOUT 5 /* min. seconds between retries */
175 #define MAXRESOLVSORT 10 /* number of net to sort on */
176 #define RES_MAXNDOTS 15 /* should reflect bit field size */
177 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
178 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
179 #define RES_DFLRETRY 2 /* Default #/tries. */
180 #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
181
182 struct __res_state_ext;
183
184 struct __res_state {
185 int retrans; /* retransmission time interval */
186 int retry; /* number of times to retransmit */
187 #ifdef __sun
188 uint_t options; /* option flags - see below. */
189 #else
190 ulong_t options; /* option flags - see below. */
191 #endif
192 int nscount; /* number of name servers */
193 struct sockaddr_in
194 nsaddr_list[MAXNS]; /* address of name server */
195 #define nsaddr nsaddr_list[0] /* for backward compatibility */
196 ushort_t id; /* current packet id */
197 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
198 char defdname[256]; /* default domain (deprecated) */
199 #ifdef __sun
200 uint_t pfcode; /* RES_PRF_ flags - see below. */
201 #else
202 ulong_t pfcode; /* RES_PRF_ flags - see below. */
203 #endif
204 unsigned ndots:4; /* threshold for initial abs. query */
205 unsigned nsort:4; /* number of elements in sort_list[] */
206 char unused[3];
207 struct {
208 struct in_addr addr;
209 unsigned int mask;
210 } sort_list[MAXRESOLVSORT];
211 res_send_qhook qhook; /* query hook */
212 res_send_rhook rhook; /* response hook */
213 int res_h_errno; /* last one set for this context */
214 int _vcsock; /* PRIVATE: for res_send VC i/o */
215 uint_t _flags; /* PRIVATE: see below */
216 uint_t _pad; /* make _u 64 bit aligned */
217 union {
218 /* On an 32-bit arch this means 512b total. */
219 char pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
220 struct {
221 uint16_t nscount;
222 uint16_t nstimes[MAXNS]; /* ms. */
223 int nssocks[MAXNS];
224 struct __res_state_ext *ext; /* extention for IPv6 */
225 uchar_t _rnd[16]; /* PRIVATE: random state */
226 } _ext;
227 } _u;
228 };
229
230 typedef struct __res_state *res_state;
231
232 union res_sockaddr_union {
233 struct sockaddr_in sin;
234 #ifdef IN6ADDR_ANY_INIT
235 struct sockaddr_in6 sin6;
236 #endif
237 #ifdef ISC_ALIGN64
238 int64_t __align64; /* 64bit alignment */
239 #else
240 int32_t __align32; /* 32bit alignment */
241 #endif
242 char __space[128]; /* max size */
243 };
244
245 /*
246 * Resolver flags (used to be discrete per-module statics ints).
247 */
248 #define RES_F_VC 0x00000001 /* socket is TCP */
249 #define RES_F_CONN 0x00000002 /* socket is connected */
250 #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
251 #define RES_F__UNUSED 0x00000008 /* (unused) */
252 #define RES_F_LASTMASK 0x000000F0 /* ordinal server of last res_nsend */
253 #define RES_F_LASTSHIFT 4 /* bit position of LASTMASK "flag" */
254 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
255
256 /* res_findzonecut2() options */
257 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
258 #define RES_IPV4ONLY 0x00000002 /* IPv4 only */
259 #define RES_IPV6ONLY 0x00000004 /* IPv6 only */
260
261 /*
262 * Resolver options (keep these in synch with res_debug.c, please)
263 */
264 #define RES_INIT 0x00000001 /* address initialized */
265 #define RES_DEBUG 0x00000002 /* print debug messages */
266 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL) */
267 #define RES_USEVC 0x00000008 /* use virtual circuit */
268 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
269 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
270 #define RES_RECURSE 0x00000040 /* recursion desired */
271 #define RES_DEFNAMES 0x00000080 /* use default domain name */
272 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
273 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
274 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
275 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
276 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
277 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
278 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
279 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
280 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
281 #define RES_BLAST 0x00020000 /* blast all recursive servers */
282 #define RES_NO_NIBBLE 0x00040000 /* disable IPv6 nibble mode reverse */
283 #define RES_NO_BITSTRING 0x00080000 /* disable IPv6 bitstring mode revrse */
284 #define RES_NOTLDQUERY 0x00100000 /* don't unqualified name as a tld */
285 #define RES_USE_DNSSEC 0x00200000 /* use DNSSEC using OK bit in OPT */
286 /* KAME extensions: use higher bit to avoid conflict with ISC use */
287 #define RES_USE_DNAME 0x10000000 /* use DNAME */
288 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */
289 #define RES_NO_NIBBLE2 0x80000000 /* disable alternate nibble lookup */
290
291 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
292
293 /*
294 * Resolver "pfcode" values. Used by dig.
295 */
296 #define RES_PRF_STATS 0x00000001
297 #define RES_PRF_UPDATE 0x00000002
298 #define RES_PRF_CLASS 0x00000004
299 #define RES_PRF_CMD 0x00000008
300 #define RES_PRF_QUES 0x00000010
301 #define RES_PRF_ANS 0x00000020
302 #define RES_PRF_AUTH 0x00000040
303 #define RES_PRF_ADD 0x00000080
304 #define RES_PRF_HEAD1 0x00000100
305 #define RES_PRF_HEAD2 0x00000200
306 #define RES_PRF_TTLID 0x00000400
307 #define RES_PRF_HEADX 0x00000800
308 #define RES_PRF_QUERY 0x00001000
309 #define RES_PRF_REPLY 0x00002000
310 #define RES_PRF_INIT 0x00004000
311 #define RES_PRF_TRUNC 0x00008000
312 /* 0x00010000 */
313
314 /* Things involving an internal (static) resolver context. */
315 #ifdef _REENTRANT
316 extern struct __res_state *__res_state(void);
317 #define _res (*__res_state())
318 #else
319 #ifndef __BIND_NOSTATIC
320 extern struct __res_state _res;
321 #endif
322 #endif
323
324 #ifndef __BIND_NOSTATIC
325 void fp_nquery __P((const uchar_t *, int, FILE *));
326 void fp_query __P((const uchar_t *, FILE *));
327 const char *hostalias __P((const char *));
328 void p_query __P((const uchar_t *));
329 void res_close __P((void));
330 int res_init __P((void));
331 int res_isourserver __P((const struct sockaddr_in *));
332 int res_mkquery __P((int, const char *, int, int, const uchar_t *,
333 int, const uchar_t *, uchar_t *, int));
334 int res_query __P((const char *, int, int, uchar_t *, int));
335 int res_querydomain __P((const char *, const char *, int, int,
336 uchar_t *, int));
337 int res_search __P((const char *, int, int, uchar_t *, int));
338 int res_send __P((const uchar_t *, int, uchar_t *, int));
339 int res_sendsigned __P((const uchar_t *, int, ns_tsig_key *,
340 uchar_t *, int));
341 #endif /* __BIND_NOSTATIC */
342
343 extern const struct res_sym __p_key_syms[];
344 extern const struct res_sym __p_cert_syms[];
345 extern const struct res_sym __p_class_syms[];
346 extern const struct res_sym __p_type_syms[];
347 extern const struct res_sym __p_rcode_syms[];
348
349 int res_hnok __P((const char *));
350 int res_ownok __P((const char *));
351 int res_mailok __P((const char *));
352 int res_dnok __P((const char *));
353 int sym_ston __P((const struct res_sym *, const char *, int *));
354 const char *sym_ntos __P((const struct res_sym *, int, int *));
355 const char *sym_ntop __P((const struct res_sym *, int, int *));
356 int b64_ntop __P((uchar_t const *, size_t, char *, size_t));
357 int b64_pton __P((char const *, uchar_t *, size_t));
358 int loc_aton __P((const char *ascii, uchar_t *binary));
359 const char *loc_ntoa __P((const uchar_t *binary, char *ascii));
360 int dn_skipname __P((const uchar_t *, const uchar_t *));
361 void putlong __P((unsigned int, uchar_t *));
362 void putshort __P((unsigned short, uchar_t *));
363 const char *p_class __P((int));
364 const char *p_time __P((unsigned int));
365 const char *p_type __P((int));
366 const char *p_rcode __P((int));
367 const char *p_sockun __P((union res_sockaddr_union, char *, size_t));
368 const uchar_t *p_cdnname __P((const uchar_t *, const uchar_t *, int,
369 FILE *));
370 const uchar_t *p_cdname __P((const uchar_t *, const uchar_t *, FILE *));
371 const uchar_t *p_fqnname __P((const uchar_t *cp, const uchar_t *msg,
372 int, char *, int));
373 const uchar_t *p_fqname __P((const uchar_t *, const uchar_t *, FILE *));
374 const char *p_option __P((uint_t option));
375 char *p_secstodate __P((uint_t));
376 int dn_count_labels __P((const char *));
377 int dn_comp __P((const char *, uchar_t *, int,
378 uchar_t **, uchar_t **));
379 int dn_expand __P((const uchar_t *, const uchar_t *,
380 const uchar_t *, char *, int));
381 void res_rndinit __P((res_state));
382 uint_t res_randomid __P((void));
383 uint_t res_nrandomid __P((res_state));
384 int res_nameinquery __P((const char *, int, int,
385 const uchar_t *, const uchar_t *));
386 int res_queriesmatch __P((const uchar_t *, const uchar_t *,
387 const uchar_t *, const uchar_t *));
388 const char *p_section __P((int section, int opcode));
389
390
391 /* Things involving a resolver context. */
392 int res_ninit __P((res_state));
393 int res_nisourserver __P((const res_state,
394 const struct sockaddr_in *));
395 void fp_resstat __P((const res_state, FILE *));
396 void res_pquery __P((const res_state, const uchar_t *, int, FILE *));
397 const char *res_hostalias __P((const res_state, const char *,
398 char *, size_t));
399 int res_nquery __P((res_state,
400 const char *, int, int, uchar_t *, int));
401 int res_nsearch __P((res_state, const char *, int,
402 int, uchar_t *, int));
403 int res_nquerydomain __P((res_state,
404 const char *, const char *, int, int,
405 uchar_t *, int));
406 int res_nmkquery __P((res_state,
407 int, const char *, int, int, const uchar_t *,
408 int, const uchar_t *, uchar_t *, int));
409 int res_nsend __P((res_state, const uchar_t *, int, uchar_t *,
410 int));
411 int res_nsendsigned __P((res_state, const uchar_t *, int,
412 ns_tsig_key *, uchar_t *, int));
413 int res_findzonecut __P((res_state, const char *, ns_class, int,
414 char *, size_t, struct in_addr *, int));
415 int res_findzonecut2 __P((res_state, const char *, ns_class, int,
416 char *, size_t, union res_sockaddr_union *,
417 int));
418 void res_nclose __P((res_state));
419 int res_nopt __P((res_state, int, uchar_t *, int, int));
420 int res_nopt_rdata __P((res_state, int, uchar_t *, int, uchar_t *,
421 ushort_t, ushort_t, uchar_t *));
422 void res_send_setqhook __P((res_send_qhook hook));
423 void res_send_setrhook __P((res_send_rhook hook));
424 int __res_vinit __P((res_state, int));
425 void res_destroyservicelist __P((void));
426 const char *res_servicename __P((uint16_t port, const char *proto));
427 const char *res_protocolname __P((int num));
428 void res_destroyprotolist __P((void));
429 void res_buildprotolist __P((void));
430 const char *res_get_nibblesuffix __P((res_state));
431 const char *res_get_nibblesuffix2 __P((res_state));
432 void res_ndestroy __P((res_state));
433 uint16_t res_nametoclass __P((const char *buf, int *success));
434 uint16_t res_nametotype __P((const char *buf, int *success));
435 void res_setservers __P((res_state,
436 const union res_sockaddr_union *, int));
437 int res_getservers __P((res_state,
438 union res_sockaddr_union *, int));
439
440
441 #ifdef __cplusplus
442 }
443 #endif
444
445 #endif /* !_RESOLV_H_ */