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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
32 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
34 * Permission to use, copy, modify, and distribute this software for any
35 * purpose with or without fee is hereby granted, provided that the above
36 * copyright notice and this permission notice appear in all copies.
38 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
39 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
41 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
42 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
43 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
44 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
48 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
49 * $Id: resolv.h,v 1.19.18.4 2008/04/03 23:15:15 marka Exp $
56 #include <sys/param.h>
57 #include <sys/types.h>
58 #include <sys/cdefs.h>
59 #include <sys/socket.h>
61 #include <arpa/nameser.h>
64 * Revision information. This is the release date in YYYYMMDD format.
65 * It can change every day so the right thing to do with it is use it
66 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
67 * compare for equality; rather, use it to determine whether your resolver
68 * is new enough to contain a certain feature.
71 #define __RES 20030124
74 * This used to be defined in res_query.c, now it's in herror.c.
75 * [XXX no it's not. It's in irs/irs_data.c]
77 * never extern'd by any *.h file before it was placed here. For thread
78 * aware programs, the last h_errno value set is stored in res->h_errno.
80 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
81 * (and __h_errno_set) to the public via <resolv.h>.
82 * XXX: __h_errno_set is really part of IRS, not part of the resolver.
83 * If somebody wants to build and use a resolver that doesn't use IRS,
84 * what do they do? Perhaps something like
86 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
88 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
92 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
93 struct __res_state; /*%< forward */
95 void __h_errno_set(struct __res_state *, int);
99 * Resolver configuration file.
100 * Normally not present, but may contain the address of the
101 * initial name server(s) to query and the domain search list.
104 #ifndef _PATH_RESCONF
105 #define _PATH_RESCONF "/etc/resolv.conf"
108 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
111 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
112 const u_char **, int *,
113 u_char *, int, int *);
115 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
116 const u_char *, int, u_char *,
120 int number; /*%< Identifying number, like T_MX */
121 const char * name; /*%< Its symbolic name, like "MX" */
122 const char * humanname; /*%< Its fun name, like "mail exchanger" */
126 * Global defines and variables for resolver stub.
128 #define MAXNS 3 /*%< max # name servers we'll track */
129 #define MAXDFLSRCH 3 /*%< # default domain levels to try */
130 #define MAXDNSRCH 6 /*%< max # domains in search path */
131 #define LOCALDOMAINPARTS 2 /*%< min levels in name that is "local" */
132 #define RES_TIMEOUT 5 /*%< min. seconds between retries */
133 #define MAXRESOLVSORT 10 /*%< number of net to sort on */
134 #define RES_MAXNDOTS 15 /*%< should reflect bit field size */
135 #define RES_MAXRETRANS 30 /*%< only for resolv.conf/RES_OPTIONS */
136 #define RES_MAXRETRY 5 /*%< only for resolv.conf/RES_OPTIONS */
137 #define RES_DFLRETRY 2 /*%< Default #/tries. */
138 #define RES_MAXTIME 65535 /*%< Infinity, in milliseconds. */
139 struct __res_state_ext;
142 int retrans; /*%< retransmission time interval */
143 int retry; /*%< number of times to retransmit */
145 * XXX: If `sun' is defined, `options' and `pfcode' are
146 * defined as u_int in original BIND9 distribution. However,
147 * it breaks binary backward compatibility against FreeBSD's
148 * resolver. So, we changed not to see `sun'.
150 #if defined(sun) && 0
151 u_int options; /*%< option flags - see below. */
153 u_long options; /*%< option flags - see below. */
155 int nscount; /*%< number of name servers */
157 nsaddr_list[MAXNS]; /*%< address of name server */
158 #define nsaddr nsaddr_list[0] /*%< for backward compatibility */
159 u_short id; /*%< current message id */
160 char *dnsrch[MAXDNSRCH+1]; /*%< components of domain to search */
161 char defdname[256]; /*%< default domain (deprecated) */
162 #if defined(sun) && 0
163 u_int pfcode; /*%< RES_PRF_ flags - see below. */
165 u_long pfcode; /*%< RES_PRF_ flags - see below. */
167 unsigned ndots:4; /*%< threshold for initial abs. query */
168 unsigned nsort:4; /*%< number of elements in sort_list[] */
173 } sort_list[MAXRESOLVSORT];
174 res_send_qhook qhook; /*%< query hook */
175 res_send_rhook rhook; /*%< response hook */
176 int res_h_errno; /*%< last one set for this context */
177 int _vcsock; /*%< PRIVATE: for res_send VC i/o */
178 u_int _flags; /*%< PRIVATE: see below */
179 u_int _pad; /*%< make _u 64 bit aligned */
181 /* On an 32-bit arch this means 512b total. */
182 char pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
185 u_int16_t nstimes[MAXNS]; /*%< ms. */
187 struct __res_state_ext *ext; /*%< extention for IPv6 */
192 typedef struct __res_state *res_state;
194 union res_sockaddr_union {
195 struct sockaddr_in sin;
196 #ifdef IN6ADDR_ANY_INIT
197 struct sockaddr_in6 sin6;
200 int64_t __align64; /*%< 64bit alignment */
202 int32_t __align32; /*%< 32bit alignment */
204 char __space[128]; /*%< max size */
208 * Resolver flags (used to be discrete per-module statics ints).
210 #define RES_F_VC 0x00000001 /*%< socket is TCP */
211 #define RES_F_CONN 0x00000002 /*%< socket is connected */
212 #define RES_F_EDNS0ERR 0x00000004 /*%< EDNS0 caused errors */
213 #define RES_F__UNUSED 0x00000008 /*%< (unused) */
214 #define RES_F_LASTMASK 0x000000F0 /*%< ordinal server of last res_nsend */
215 #define RES_F_LASTSHIFT 4 /*%< bit position of LASTMASK "flag" */
216 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
218 /* res_findzonecut2() options */
219 #define RES_EXHAUSTIVE 0x00000001 /*%< always do all queries */
220 #define RES_IPV4ONLY 0x00000002 /*%< IPv4 only */
221 #define RES_IPV6ONLY 0x00000004 /*%< IPv6 only */
224 * Resolver options (keep these in synch with res_debug.c, please)
226 #define RES_INIT 0x00000001 /*%< address initialized */
227 #define RES_DEBUG 0x00000002 /*%< print debug messages */
228 #define RES_AAONLY 0x00000004 /*%< authoritative answers only (!IMPL)*/
229 #define RES_USEVC 0x00000008 /*%< use virtual circuit */
230 #define RES_PRIMARY 0x00000010 /*%< query primary server only (!IMPL) */
231 #define RES_IGNTC 0x00000020 /*%< ignore truncation errors */
232 #define RES_RECURSE 0x00000040 /*%< recursion desired */
233 #define RES_DEFNAMES 0x00000080 /*%< use default domain name */
234 #define RES_STAYOPEN 0x00000100 /*%< Keep TCP socket open */
235 #define RES_DNSRCH 0x00000200 /*%< search up local domain tree */
236 #define RES_INSECURE1 0x00000400 /*%< type 1 security disabled */
237 #define RES_INSECURE2 0x00000800 /*%< type 2 security disabled */
238 #define RES_NOALIASES 0x00001000 /*%< shuts off HOSTALIASES feature */
239 #define RES_USE_INET6 0x00002000 /*%< use/map IPv6 in gethostbyname() */
240 #define RES_ROTATE 0x00004000 /*%< rotate ns list after each query */
241 #define RES_NOCHECKNAME 0x00008000 /*%< do not check names for sanity. */
242 #define RES_KEEPTSIG 0x00010000 /*%< do not strip TSIG records */
243 #define RES_BLAST 0x00020000 /*%< blast all recursive servers */
244 #define RES_NSID 0x00040000 /*%< request name server ID */
245 #define RES_NOTLDQUERY 0x00100000 /*%< don't unqualified name as a tld */
246 #define RES_USE_DNSSEC 0x00200000 /*%< use DNSSEC using OK bit in OPT */
247 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */
248 /* KAME extensions: use higher bit to avoid conflict with ISC use */
249 #define RES_USE_DNAME 0x10000000 /*%< use DNAME */
250 #define RES_USE_EDNS0 0x40000000 /*%< use EDNS0 if configured */
251 #define RES_NO_NIBBLE2 0x80000000 /*%< disable alternate nibble lookup */
253 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | \
254 RES_DNSRCH | RES_NO_NIBBLE2)
257 * Resolver "pfcode" values. Used by dig.
259 #define RES_PRF_STATS 0x00000001
260 #define RES_PRF_UPDATE 0x00000002
261 #define RES_PRF_CLASS 0x00000004
262 #define RES_PRF_CMD 0x00000008
263 #define RES_PRF_QUES 0x00000010
264 #define RES_PRF_ANS 0x00000020
265 #define RES_PRF_AUTH 0x00000040
266 #define RES_PRF_ADD 0x00000080
267 #define RES_PRF_HEAD1 0x00000100
268 #define RES_PRF_HEAD2 0x00000200
269 #define RES_PRF_TTLID 0x00000400
270 #define RES_PRF_HEADX 0x00000800
271 #define RES_PRF_QUERY 0x00001000
272 #define RES_PRF_REPLY 0x00002000
273 #define RES_PRF_INIT 0x00004000
274 #define RES_PRF_TRUNC 0x00008000
277 /* Things involving an internal (static) resolver context. */
279 extern struct __res_state *__res_state(void);
281 #define _res (*__res_state())
283 #ifndef __BIND_NOSTATIC
284 #define fp_nquery __fp_nquery
285 #define fp_query __fp_query
286 #define hostalias __hostalias
287 #define p_query __p_query
288 #define res_close __res_close
289 #define res_init __res_init
290 #define res_isourserver __res_isourserver
291 #define res_mkquery __res_mkquery
292 #define res_opt __res_opt
293 #define res_query __res_query
294 #define res_querydomain __res_querydomain
295 #define res_search __res_search
296 #define res_send __res_send
297 #define res_sendsigned __res_sendsigned
300 void fp_nquery(const u_char *, int, FILE *);
301 void fp_query(const u_char *, FILE *);
302 const char * hostalias(const char *);
303 void p_query(const u_char *);
304 void res_close(void);
306 int res_isourserver(const struct sockaddr_in *);
307 int res_mkquery(int, const char *, int, int, const u_char *,
308 int, const u_char *, u_char *, int);
309 int res_opt(int, u_char *, int, int);
310 int res_query(const char *, int, int, u_char *, int);
311 int res_querydomain(const char *, const char *, int, int,
313 int res_search(const char *, int, int, u_char *, int);
314 int res_send(const u_char *, int, u_char *, int);
315 int res_sendsigned(const u_char *, int, ns_tsig_key *,
320 #if !defined(SHARED_LIBBIND) || defined(LIB)
322 * If libbind is a shared object (well, DLL anyway)
323 * these externs break the linker when resolv.h is
324 * included by a lib client (like named)
325 * Make them go away if a client is including this
328 extern const struct res_sym __p_key_syms[];
329 extern const struct res_sym __p_cert_syms[];
330 extern const struct res_sym __p_class_syms[];
331 extern const struct res_sym __p_type_syms[];
332 extern const struct res_sym __p_rcode_syms[];
333 #endif /* SHARED_LIBBIND */
335 #define b64_ntop __b64_ntop
336 #define b64_pton __b64_pton
337 #define dn_comp __dn_comp
338 #define dn_count_labels __dn_count_labels
339 #define dn_expand __dn_expand
340 #define dn_skipname __dn_skipname
341 #define fp_resstat __fp_resstat
342 #define loc_aton __loc_aton
343 #define loc_ntoa __loc_ntoa
344 #define p_cdname __p_cdname
345 #define p_cdnname __p_cdnname
346 #define p_class __p_class
347 #define p_fqname __p_fqname
348 #define p_fqnname __p_fqnname
349 #define p_option __p_option
350 #define p_secstodate __p_secstodate
351 #define p_section __p_section
352 #define p_time __p_time
353 #define p_type __p_type
354 #define p_rcode __p_rcode
355 #define p_sockun __p_sockun
356 #define putlong __putlong
357 #define putshort __putshort
358 #define res_dnok __res_dnok
360 #define res_findzonecut __res_findzonecut
362 #define res_findzonecut2 __res_findzonecut2
363 #define res_hnok __res_hnok
364 #define res_hostalias __res_hostalias
365 #define res_mailok __res_mailok
366 #define res_nameinquery __res_nameinquery
367 #define res_nclose __res_nclose
368 #define res_ninit __res_ninit
369 #define res_nmkquery __res_nmkquery
370 #define res_pquery __res_pquery
371 #define res_nquery __res_nquery
372 #define res_nquerydomain __res_nquerydomain
373 #define res_nsearch __res_nsearch
374 #define res_nsend __res_nsend
376 #define res_nsendsigned __res_nsendsigned
378 #define res_nisourserver __res_nisourserver
379 #define res_ownok __res_ownok
380 #define res_queriesmatch __res_queriesmatch
381 #define res_randomid __res_randomid
382 #define sym_ntop __sym_ntop
383 #define sym_ntos __sym_ntos
384 #define sym_ston __sym_ston
385 #define res_nopt __res_nopt
386 #define res_nopt_rdata __res_nopt_rdata
387 #define res_ndestroy __res_ndestroy
388 #define res_nametoclass __res_nametoclass
389 #define res_nametotype __res_nametotype
390 #define res_setservers __res_setservers
391 #define res_getservers __res_getservers
393 #define res_buildprotolist __res_buildprotolist
394 #define res_destroyprotolist __res_destroyprotolist
395 #define res_destroyservicelist __res_destroyservicelist
396 #define res_get_nibblesuffix __res_get_nibblesuffix
397 #define res_get_nibblesuffix2 __res_get_nibblesuffix2
399 #define res_ourserver_p __res_ourserver_p
401 #define res_protocolname __res_protocolname
402 #define res_protocolnumber __res_protocolnumber
404 #define res_send_setqhook __res_send_setqhook
405 #define res_send_setrhook __res_send_setrhook
407 #define res_servicename __res_servicename
408 #define res_servicenumber __res_servicenumber
411 int res_hnok(const char *);
412 int res_ownok(const char *);
413 int res_mailok(const char *);
414 int res_dnok(const char *);
415 int sym_ston(const struct res_sym *, const char *, int *);
416 const char * sym_ntos(const struct res_sym *, int, int *);
417 const char * sym_ntop(const struct res_sym *, int, int *);
418 int b64_ntop(u_char const *, size_t, char *, size_t);
419 int b64_pton(char const *, u_char *, size_t);
420 int loc_aton(const char *, u_char *);
421 const char * loc_ntoa(const u_char *, char *);
422 int dn_skipname(const u_char *, const u_char *);
423 void putlong(u_int32_t, u_char *);
424 void putshort(u_int16_t, u_char *);
426 u_int16_t _getshort(const u_char *);
427 u_int32_t _getlong(const u_char *);
429 const char * p_class(int);
430 const char * p_time(u_int32_t);
431 const char * p_type(int);
432 const char * p_rcode(int);
433 const char * p_sockun(union res_sockaddr_union, char *, size_t);
434 const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *);
435 const u_char * p_cdname(const u_char *, const u_char *, FILE *);
436 const u_char * p_fqnname(const u_char *, const u_char *, int, char *, int);
437 const u_char * p_fqname(const u_char *, const u_char *, FILE *);
438 const char * p_option(u_long);
439 char * p_secstodate(u_long);
440 int dn_count_labels(const char *);
441 int dn_comp(const char *, u_char *, int, u_char **, u_char **);
442 int dn_expand(const u_char *, const u_char *, const u_char *,
444 u_int res_randomid(void);
445 int res_nameinquery(const char *, int, int, const u_char *,
447 int res_queriesmatch(const u_char *, const u_char *,
448 const u_char *, const u_char *);
449 const char * p_section(int, int);
450 /* Things involving a resolver context. */
451 int res_ninit(res_state);
452 int res_nisourserver(const res_state, const struct sockaddr_in *);
453 void fp_resstat(const res_state, FILE *);
454 void res_pquery(const res_state, const u_char *, int, FILE *);
455 const char * res_hostalias(const res_state, const char *, char *, size_t);
456 int res_nquery(res_state, const char *, int, int, u_char *, int);
457 int res_nsearch(res_state, const char *, int, int, u_char *, int);
458 int res_nquerydomain(res_state, const char *, const char *,
459 int, int, u_char *, int);
460 int res_nmkquery(res_state, int, const char *, int, int,
461 const u_char *, int, const u_char *,
463 int res_nsend(res_state, const u_char *, int, u_char *, int);
465 int res_nsendsigned(res_state, const u_char *, int,
466 ns_tsig_key *, u_char *, int);
467 int res_findzonecut(res_state, const char *, ns_class, int,
468 char *, size_t, struct in_addr *, int);
470 int res_findzonecut2(res_state, const char *, ns_class, int,
472 union res_sockaddr_union *, int);
473 void res_nclose(res_state);
474 int res_nopt(res_state, int, u_char *, int, int);
475 int res_nopt_rdata(res_state, int, u_char *, int, u_char *,
476 u_short, u_short, u_char *);
477 void res_send_setqhook(res_send_qhook);
478 void res_send_setrhook(res_send_rhook);
479 int __res_vinit(res_state, int);
481 void res_destroyservicelist(void);
482 const char * res_servicename(u_int16_t, const char *);
483 const char * res_protocolname(int);
484 void res_destroyprotolist(void);
485 void res_buildprotolist(void);
486 const char * res_get_nibblesuffix(res_state);
487 const char * res_get_nibblesuffix2(res_state);
489 void res_ndestroy(res_state);
490 u_int16_t res_nametoclass(const char *, int *);
491 u_int16_t res_nametotype(const char *, int *);
492 void res_setservers(res_state, const union res_sockaddr_union *,
494 int res_getservers(res_state, union res_sockaddr_union *, int);
497 #endif /* !_RESOLV_H_ */