2 * Copyright (c) 1983, 1987, 1989
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
36 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
38 * Permission to use, copy, modify, and distribute this software for any
39 * purpose with or without fee is hereby granted, provided that the above
40 * copyright notice and this permission notice appear in all copies.
42 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
43 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
44 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
45 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
46 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
47 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
48 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
52 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
53 * $Id: resolv.h,v 1.7.2.11.4.3 2005/08/25 04:44:13 marka Exp $
59 #include <sys/param.h>
60 #if (!defined(BSD)) || (BSD < 199306)
61 # include <sys/bitypes.h>
63 # include <sys/types.h>
65 #include <sys/cdefs.h>
66 #include <sys/socket.h>
68 #include <arpa/nameser.h>
71 * Revision information. This is the release date in YYYYMMDD format.
72 * It can change every day so the right thing to do with it is use it
73 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
74 * compare for equality; rather, use it to determine whether your resolver
75 * is new enough to contain a certain feature.
78 #define __RES 20030124
81 * This used to be defined in res_query.c, now it's in herror.c.
82 * [XXX no it's not. It's in irs/irs_data.c]
84 * never extern'd by any *.h file before it was placed here. For thread
85 * aware programs, the last h_errno value set is stored in res->h_errno.
87 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
88 * (and __h_errno_set) to the public via <resolv.h>.
89 * XXX: __h_errno_set is really part of IRS, not part of the resolver.
90 * If somebody wants to build and use a resolver that doesn't use IRS,
91 * what do they do? Perhaps something like
93 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
95 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
99 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
100 struct __res_state; /* forward */
102 void __h_errno_set(struct __res_state *res, int err);
106 * Resolver configuration file.
107 * Normally not present, but may contain the address of the
108 * initial name server(s) to query and the domain search list.
111 #ifndef _PATH_RESCONF
112 #define _PATH_RESCONF "/etc/resolv.conf"
115 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
119 #if defined(__STDC__) || defined(__cplusplus)
120 #define __PMT(args) args
122 #define __PMT(args) ()
126 typedef res_sendhookact (*res_send_qhook)__PMT((struct sockaddr * const *,
127 const u_char **, int *,
128 u_char *, int, int *));
130 typedef res_sendhookact (*res_send_rhook)__PMT((const struct sockaddr *,
131 const u_char *, int, u_char *,
135 int number; /* Identifying number, like T_MX */
136 const char * name; /* Its symbolic name, like "MX" */
137 const char * humanname; /* Its fun name, like "mail exchanger" */
141 * Global defines and variables for resolver stub.
143 #define MAXNS 3 /* max # name servers we'll track */
144 #define MAXDFLSRCH 3 /* # default domain levels to try */
145 #define MAXDNSRCH 6 /* max # domains in search path */
146 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
148 #define RES_TIMEOUT 5 /* min. seconds between retries */
149 #define MAXRESOLVSORT 10 /* number of net to sort on */
150 #define RES_MAXNDOTS 15 /* should reflect bit field size */
151 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
152 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
153 #define RES_DFLRETRY 2 /* Default #/tries. */
154 #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
156 struct __res_state_ext;
159 int retrans; /* retransmission time interval */
160 int retry; /* number of times to retransmit */
162 u_int options; /* option flags - see below. */
164 u_long options; /* option flags - see below. */
166 int nscount; /* number of name servers */
168 nsaddr_list[MAXNS]; /* address of name server */
169 #define nsaddr nsaddr_list[0] /* for backward compatibility */
170 u_short id; /* current message id */
171 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
172 char defdname[256]; /* default domain (deprecated) */
174 u_int pfcode; /* RES_PRF_ flags - see below. */
176 u_long pfcode; /* RES_PRF_ flags - see below. */
178 unsigned ndots:4; /* threshold for initial abs. query */
179 unsigned nsort:4; /* number of elements in sort_list[] */
184 } sort_list[MAXRESOLVSORT];
185 res_send_qhook qhook; /* query hook */
186 res_send_rhook rhook; /* response hook */
187 int res_h_errno; /* last one set for this context */
188 int _vcsock; /* PRIVATE: for res_send VC i/o */
189 u_int _flags; /* PRIVATE: see below */
190 u_int _pad; /* make _u 64 bit aligned */
192 /* On an 32-bit arch this means 512b total. */
193 char pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
196 u_int16_t nstimes[MAXNS]; /* ms. */
198 struct __res_state_ext *ext; /* extention for IPv6 */
203 typedef struct __res_state *res_state;
205 union res_sockaddr_union {
206 struct sockaddr_in sin;
207 #ifdef IN6ADDR_ANY_INIT
208 struct sockaddr_in6 sin6;
211 int64_t __align64; /* 64bit alignment */
213 int32_t __align32; /* 32bit alignment */
215 char __space[128]; /* max size */
219 * Resolver flags (used to be discrete per-module statics ints).
221 #define RES_F_VC 0x00000001 /* socket is TCP */
222 #define RES_F_CONN 0x00000002 /* socket is connected */
223 #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
224 #define RES_F__UNUSED 0x00000008 /* (unused) */
225 #define RES_F_LASTMASK 0x000000F0 /* ordinal server of last res_nsend */
226 #define RES_F_LASTSHIFT 4 /* bit position of LASTMASK "flag" */
227 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
229 /* res_findzonecut2() options */
230 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
231 #define RES_IPV4ONLY 0x00000002 /* IPv4 only */
232 #define RES_IPV6ONLY 0x00000004 /* IPv6 only */
235 * Resolver options (keep these in synch with res_debug.c, please)
237 #define RES_INIT 0x00000001 /* address initialized */
238 #define RES_DEBUG 0x00000002 /* print debug messages */
239 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
240 #define RES_USEVC 0x00000008 /* use virtual circuit */
241 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
242 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
243 #define RES_RECURSE 0x00000040 /* recursion desired */
244 #define RES_DEFNAMES 0x00000080 /* use default domain name */
245 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
246 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
247 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
248 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
249 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
250 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
251 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
252 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
253 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
254 #define RES_BLAST 0x00020000 /* blast all recursive servers */
255 #define RES_NOTLDQUERY 0x00100000 /* don't unqualified name as a tld */
256 #define RES_USE_DNSSEC 0x00200000 /* use DNSSEC using OK bit in OPT */
257 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */
258 /* KAME extensions: use higher bit to avoid conflict with ISC use */
259 #define RES_USE_DNAME 0x10000000 /* use DNAME */
260 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */
261 #define RES_NO_NIBBLE2 0x80000000 /* disable alternate nibble lookup */
263 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | \
264 RES_DNSRCH | RES_NO_NIBBLE2)
267 * Resolver "pfcode" values. Used by dig.
269 #define RES_PRF_STATS 0x00000001
270 #define RES_PRF_UPDATE 0x00000002
271 #define RES_PRF_CLASS 0x00000004
272 #define RES_PRF_CMD 0x00000008
273 #define RES_PRF_QUES 0x00000010
274 #define RES_PRF_ANS 0x00000020
275 #define RES_PRF_AUTH 0x00000040
276 #define RES_PRF_ADD 0x00000080
277 #define RES_PRF_HEAD1 0x00000100
278 #define RES_PRF_HEAD2 0x00000200
279 #define RES_PRF_TTLID 0x00000400
280 #define RES_PRF_HEADX 0x00000800
281 #define RES_PRF_QUERY 0x00001000
282 #define RES_PRF_REPLY 0x00002000
283 #define RES_PRF_INIT 0x00004000
284 #define RES_PRF_TRUNC 0x00008000
287 /* Things involving an internal (static) resolver context. */
290 extern struct __res_state *__res_state(void);
292 #define _res (*__res_state())
296 extern struct __res_state * __res_state(void);
299 #ifndef __BIND_NOSTATIC
300 extern struct __res_state _res;
304 #ifndef __BIND_NOSTATIC
305 #define fp_nquery __fp_nquery
306 #define fp_query __fp_query
307 #define hostalias __hostalias
308 #define p_query __p_query
309 #define res_close __res_close
310 #define res_init __res_init
311 #define res_isourserver __res_isourserver
312 #define res_mkquery __res_mkquery
313 #define res_query __res_query
314 #define res_querydomain __res_querydomain
315 #define res_search __res_search
316 #define res_send __res_send
317 #define res_sendsigned __res_sendsigned
320 void fp_nquery __P((const u_char *, int, FILE *));
321 void fp_query __P((const u_char *, FILE *));
322 const char * hostalias __P((const char *));
323 void p_query __P((const u_char *));
324 void res_close __P((void));
325 int res_init __P((void));
326 int res_isourserver __P((const struct sockaddr_in *));
327 int res_mkquery __P((int, const char *, int, int, const u_char *,
328 int, const u_char *, u_char *, int));
329 int res_query __P((const char *, int, int, u_char *, int));
330 int res_querydomain __P((const char *, const char *, int, int,
332 int res_search __P((const char *, int, int, u_char *, int));
333 int res_send __P((const u_char *, int, u_char *, int));
334 int res_sendsigned __P((const u_char *, int, ns_tsig_key *,
339 #if !defined(SHARED_LIBBIND) || defined(LIB)
341 * If libbind is a shared object (well, DLL anyway)
342 * these externs break the linker when resolv.h is
343 * included by a lib client (like named)
344 * Make them go away if a client is including this
347 extern const struct res_sym __p_key_syms[];
348 extern const struct res_sym __p_cert_syms[];
349 extern const struct res_sym __p_class_syms[];
350 extern const struct res_sym __p_type_syms[];
351 extern const struct res_sym __p_rcode_syms[];
352 #endif /* SHARED_LIBBIND */
354 #define b64_ntop __b64_ntop
355 #define b64_pton __b64_pton
356 #define dn_comp __dn_comp
357 #define dn_count_labels __dn_count_labels
358 #define dn_expand __dn_expand
359 #define dn_skipname __dn_skipname
360 #define fp_resstat __fp_resstat
361 #define loc_aton __loc_aton
362 #define loc_ntoa __loc_ntoa
363 #define p_cdname __p_cdname
364 #define p_cdnname __p_cdnname
365 #define p_class __p_class
366 #define p_fqname __p_fqname
367 #define p_fqnname __p_fqnname
368 #define p_option __p_option
369 #define p_secstodate __p_secstodate
370 #define p_section __p_section
371 #define p_time __p_time
372 #define p_type __p_type
373 #define p_rcode __p_rcode
374 #define p_sockun __p_sockun
375 #define putlong __putlong
376 #define putshort __putshort
377 #define res_dnok __res_dnok
378 #define res_findzonecut __res_findzonecut
379 #define res_findzonecut2 __res_findzonecut2
380 #define res_hnok __res_hnok
381 #define res_hostalias __res_hostalias
382 #define res_mailok __res_mailok
383 #define res_nameinquery __res_nameinquery
384 #define res_nclose __res_nclose
385 #define res_ninit __res_ninit
386 #define res_nmkquery __res_nmkquery
387 #define res_pquery __res_pquery
388 #define res_nquery __res_nquery
389 #define res_nquerydomain __res_nquerydomain
390 #define res_nsearch __res_nsearch
391 #define res_nsend __res_nsend
392 #define res_nsendsigned __res_nsendsigned
393 #define res_nisourserver __res_nisourserver
394 #define res_ownok __res_ownok
395 #define res_queriesmatch __res_queriesmatch
396 #define res_randomid __res_randomid
397 #define sym_ntop __sym_ntop
398 #define sym_ntos __sym_ntos
399 #define sym_ston __sym_ston
400 #define res_nopt __res_nopt
401 #define res_ndestroy __res_ndestroy
402 #define res_nametoclass __res_nametoclass
403 #define res_nametotype __res_nametotype
404 #define res_setservers __res_setservers
405 #define res_getservers __res_getservers
406 #define res_buildprotolist __res_buildprotolist
407 #define res_destroyprotolist __res_destroyprotolist
408 #define res_destroyservicelist __res_destroyservicelist
409 #define res_get_nibblesuffix __res_get_nibblesuffix
410 #define res_get_nibblesuffix2 __res_get_nibblesuffix2
411 #define res_ourserver_p __res_ourserver_p
412 #define res_protocolname __res_protocolname
413 #define res_protocolnumber __res_protocolnumber
414 #define res_send_setqhook __res_send_setqhook
415 #define res_send_setrhook __res_send_setrhook
416 #define res_servicename __res_servicename
417 #define res_servicenumber __res_servicenumber
419 int res_hnok __P((const char *));
420 int res_ownok __P((const char *));
421 int res_mailok __P((const char *));
422 int res_dnok __P((const char *));
423 int sym_ston __P((const struct res_sym *, const char *, int *));
424 const char * sym_ntos __P((const struct res_sym *, int, int *));
425 const char * sym_ntop __P((const struct res_sym *, int, int *));
426 int b64_ntop __P((u_char const *, size_t, char *, size_t));
427 int b64_pton __P((char const *, u_char *, size_t));
428 int loc_aton __P((const char *, u_char *));
429 const char * loc_ntoa __P((const u_char *, char *));
430 int dn_skipname __P((const u_char *, const u_char *));
431 void putlong __P((u_int32_t, u_char *));
432 void putshort __P((u_int16_t, u_char *));
434 u_int16_t _getshort __P((const u_char *));
435 u_int32_t _getlong __P((const u_char *));
437 const char * p_class __P((int));
438 const char * p_time __P((u_int32_t));
439 const char * p_type __P((int));
440 const char * p_rcode __P((int));
441 const char * p_sockun __P((union res_sockaddr_union, char *, size_t));
442 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
443 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
444 const u_char * p_fqnname __P((const u_char *, const u_char *,
446 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
447 const char * p_option __P((u_long));
448 char * p_secstodate __P((u_long));
449 int dn_count_labels __P((const char *));
450 int dn_comp __P((const char *, u_char *, int,
451 u_char **, u_char **));
452 int dn_expand __P((const u_char *, const u_char *, const u_char *,
454 u_int res_randomid __P((void));
455 int res_nameinquery __P((const char *, int, int, const u_char *,
457 int res_queriesmatch __P((const u_char *, const u_char *,
458 const u_char *, const u_char *));
459 const char * p_section __P((int, int));
460 /* Things involving a resolver context. */
461 int res_ninit __P((res_state));
462 int res_nisourserver __P((const res_state,
463 const struct sockaddr_in *));
464 void fp_resstat __P((const res_state, FILE *));
465 void res_pquery __P((const res_state, const u_char *, int, FILE *));
466 const char * res_hostalias __P((const res_state, const char *,
468 int res_nquery __P((res_state, const char *, int, int,
470 int res_nsearch __P((res_state, const char *, int, int, u_char *,
472 int res_nquerydomain __P((res_state, const char *, const char *,
473 int, int, u_char *, int));
474 int res_nmkquery __P((res_state, int, const char *, int, int,
475 const u_char *, int, const u_char *,
477 int res_nsend __P((res_state, const u_char *, int, u_char *, int));
478 int res_nsendsigned __P((res_state, const u_char *, int,
479 ns_tsig_key *, u_char *, int));
480 int res_findzonecut __P((res_state, const char *, ns_class, int,
481 char *, size_t, struct in_addr *, int));
482 int res_findzonecut2 __P((res_state, const char *, ns_class, int,
484 union res_sockaddr_union *, int));
485 void res_nclose __P((res_state));
486 int res_nopt __P((res_state, int, u_char *, int, int));
487 void res_send_setqhook __P((res_send_qhook));
488 void res_send_setrhook __P((res_send_rhook));
489 int __res_vinit __P((res_state, int));
490 void res_destroyservicelist __P((void));
491 const char * res_servicename __P((u_int16_t, const char *));
492 const char * res_protocolname __P((int));
493 void res_destroyprotolist __P((void));
494 void res_buildprotolist __P((void));
495 const char * res_get_nibblesuffix __P((res_state));
496 const char * res_get_nibblesuffix2 __P((res_state));
497 void res_ndestroy __P((res_state));
498 u_int16_t res_nametoclass __P((const char *, int *));
499 u_int16_t res_nametotype __P((const char *, int *));
500 void res_setservers __P((res_state,
501 const union res_sockaddr_union *, int));
502 int res_getservers __P((res_state,
503 union res_sockaddr_union *, int));
506 #endif /* !_RESOLV_H_ */