resolv.h 17 KB

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  1. /*
  2. * Copyright (c) 1983, 1987, 1989
  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 the following conditions
  7. * are met:
  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. * 4. 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.
  16. *
  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
  27. * SUCH DAMAGE.
  28. */
  29. /*
  30. * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  31. *
  32. * Permission to use, copy, modify, and distribute this software for any
  33. * purpose with or without fee is hereby granted, provided that the above
  34. * copyright notice and this permission notice appear in all copies.
  35. *
  36. * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  37. * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  38. * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  39. * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  40. * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  41. * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  42. * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  43. * SOFTWARE.
  44. */
  45. /*
  46. * @(#)resolv.h 8.1 (Berkeley) 6/2/93
  47. * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
  48. */
  49. #ifndef _RESOLV_H_
  50. /* These headers are needed for types used in the `struct res_state'
  51. declaration. */
  52. #include <sys/types.h>
  53. #include <netinet/in.h>
  54. #ifndef __need_res_state
  55. # define _RESOLV_H_
  56. # include <sys/param.h>
  57. # include <sys/cdefs.h>
  58. # include <stdio.h>
  59. # include <arpa/nameser.h>
  60. #endif
  61. #ifndef __res_state_defined
  62. # define __res_state_defined
  63. typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
  64. res_sendhookact;
  65. typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
  66. const u_char **query,
  67. int *querylen,
  68. u_char *ans,
  69. int anssiz,
  70. int *resplen);
  71. typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
  72. const u_char *query,
  73. int querylen,
  74. u_char *ans,
  75. int anssiz,
  76. int *resplen);
  77. /*
  78. * Global defines and variables for resolver stub.
  79. */
  80. # define MAXNS 3 /* max # name servers we'll track */
  81. # define MAXDFLSRCH 3 /* # default domain levels to try */
  82. # define MAXDNSRCH 6 /* max # domains in search path */
  83. # define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
  84. # define RES_TIMEOUT 5 /* min. seconds between retries */
  85. # define MAXRESOLVSORT 10 /* number of net to sort on */
  86. # define RES_MAXNDOTS 15 /* should reflect bit field size */
  87. # define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
  88. # define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
  89. # define RES_DFLRETRY 3 /* Default #/tries. */
  90. /* (glibc uses RES_DFLRETRY of 2 but also does _res.retry = 4 sometimes (!) */
  91. # define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
  92. /* _res (an instance of this structure) uses 0.5kb in bss
  93. * in "ordinary" libc's (glibc, xBSD). We want to be less wasteful.
  94. * We (1) shuffle and shrink some integer fields,
  95. * and (2) can switch off stuff we don't support.
  96. * Everything inside __UCLIBC_HAS_COMPAT_RES_STATE__
  97. * is not actually used by uclibc and can be configured off.
  98. * However, this will prevent some programs from building.
  99. * Really obscure stuff with no observed users in the wild is under
  100. * __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__.
  101. * I guess it's safe to set that to N.
  102. */
  103. struct __res_state {
  104. /*int retrans, retry; - moved, was here */
  105. u_int32_t options; /* (was: ulong) option flags - see below. */
  106. struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */
  107. #define nsaddr nsaddr_list[0] /* for backward compatibility */
  108. char *dnsrch[MAXDNSRCH + 1]; /* components of domain to search */
  109. /*char defdname[256]; - moved, was here */
  110. u_int8_t nscount; /* (was: int) number of name servers */
  111. u_int8_t ndots; /* (was: unsigned:4) threshold for initial abs. query */
  112. u_int8_t retrans; /* (was: int) retransmission time interval */
  113. u_int8_t retry; /* (was: int) number of times to retransmit */
  114. #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
  115. /* googling for "_res.defdname" says it's still sometimes used.
  116. * Pity. It's huge, I want to move it to EXTRA_COMPAT... */
  117. char defdname[256]; /* default domain (deprecated) */
  118. u_int8_t nsort; /* (was: unsigned:4) number of elements in sort_list[] */
  119. u_int16_t pfcode; /* (was: ulong) RES_PRF_ flags. Used by dig. */
  120. unsigned short id; /* current message id */
  121. int res_h_errno; /* last one set for this context */
  122. struct {
  123. struct in_addr addr;
  124. u_int32_t mask;
  125. } sort_list[MAXRESOLVSORT];
  126. #endif
  127. /* I assume that the intention is to store all
  128. * DNS servers' addresses here, and duplicate in nsaddr_list[]
  129. * those which have IPv4 address. In the case of IPv4 address
  130. * _u._ext.nsaddrs[x] will point to some nsaddr_list[y],
  131. * otherwise it will point into malloc'ed sockaddr_in6.
  132. * nscount is the number of IPv4 addresses and _u._ext.nscount
  133. * is the number of addresses of all kinds.
  134. *
  135. * If this differs from established usage and you need
  136. * to change this, please describe how it is supposed to work.
  137. */
  138. union {
  139. struct {
  140. #ifdef __UCLIBC_HAS_IPV6__
  141. struct sockaddr_in6 *nsaddrs[MAXNS];
  142. #endif
  143. u_int8_t nscount; /* (was: u_int16_t) */
  144. #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
  145. /* rather obscure, and differs in BSD and glibc */
  146. u_int16_t nstimes[MAXNS];
  147. int nssocks[MAXNS];
  148. u_int16_t nscount6;
  149. u_int16_t nsinit;
  150. /* glibc also has: */
  151. /*u_int16_t nsmap[MAXNS];*/
  152. /*unsigned long long initstamp;*/
  153. #endif
  154. } _ext;
  155. } _u;
  156. #ifdef __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__
  157. /* Truly obscure stuff.
  158. * Googling for "_res.XXX" for these members
  159. * turned up basically empty */
  160. res_send_qhook qhook; /* query hook */
  161. res_send_rhook rhook; /* response hook */
  162. int _vcsock; /* PRIVATE: for res_send VC i/o */
  163. unsigned _flags; /* PRIVATE: see below */
  164. #endif
  165. };
  166. typedef struct __res_state *res_state;
  167. # undef __need_res_state
  168. #endif
  169. #ifdef _RESOLV_H_
  170. /*
  171. * Revision information. This is the release date in YYYYMMDD format.
  172. * It can change every day so the right thing to do with it is use it
  173. * in preprocessor commands such as "#if (__RES > 19931104)". Do not
  174. * compare for equality; rather, use it to determine whether your resolver
  175. * is new enough to contain a certain feature.
  176. */
  177. #if 0
  178. #define __RES 19991006
  179. #else
  180. #define __RES 19960801
  181. #endif
  182. /*
  183. * Resolver configuration file.
  184. * Normally not present, but may contain the address of the
  185. * inital name server(s) to query and the domain search list.
  186. */
  187. #ifndef _PATH_RESCONF
  188. #define _PATH_RESCONF "/etc/resolv.conf"
  189. #endif
  190. struct res_sym {
  191. int number; /* Identifying number, like T_MX */
  192. char * name; /* Its symbolic name, like "MX" */
  193. char * humanname; /* Its fun name, like "mail exchanger" */
  194. };
  195. /*
  196. * Resolver flags (used to be discrete per-module statics ints).
  197. */
  198. #define RES_F_VC 0x00000001 /* socket is TCP */
  199. #define RES_F_CONN 0x00000002 /* socket is connected */
  200. /* res_findzonecut() options */
  201. #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
  202. /*
  203. * Resolver options (keep these in synch with res_debug.c, please)
  204. * (which of these do we really implement??)
  205. */
  206. #define RES_INIT 0x00000001 /* address initialized */
  207. #define RES_DEBUG 0x00000002 /* print debug messages */
  208. #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
  209. #define RES_USEVC 0x00000008 /* use virtual circuit */
  210. #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
  211. #define RES_IGNTC 0x00000020 /* ignore trucation errors */
  212. #define RES_RECURSE 0x00000040 /* recursion desired */
  213. #define RES_DEFNAMES 0x00000080 /* use default domain name */
  214. #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
  215. #define RES_DNSRCH 0x00000200 /* search up local domain tree */
  216. #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
  217. #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
  218. #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
  219. #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
  220. #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
  221. #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
  222. #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
  223. #define RES_BLAST 0x00020000 /* blast all recursive servers */
  224. #if 0
  225. #define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte
  226. strings */
  227. #define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
  228. reverse lookup */
  229. #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
  230. #else
  231. #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH)
  232. #endif
  233. /*
  234. * Resolver "pfcode" values. Used by dig.
  235. */
  236. #define RES_PRF_STATS 0x00000001
  237. #define RES_PRF_UPDATE 0x00000002
  238. #define RES_PRF_CLASS 0x00000004
  239. #define RES_PRF_CMD 0x00000008
  240. #define RES_PRF_QUES 0x00000010
  241. #define RES_PRF_ANS 0x00000020
  242. #define RES_PRF_AUTH 0x00000040
  243. #define RES_PRF_ADD 0x00000080
  244. #define RES_PRF_HEAD1 0x00000100
  245. #define RES_PRF_HEAD2 0x00000200
  246. #define RES_PRF_TTLID 0x00000400
  247. #define RES_PRF_HEADX 0x00000800
  248. #define RES_PRF_QUERY 0x00001000
  249. #define RES_PRF_REPLY 0x00002000
  250. #define RES_PRF_INIT 0x00004000
  251. /* 0x00008000 */
  252. /* Things involving an internal (static) resolver context. */
  253. __BEGIN_DECLS
  254. extern struct __res_state *__res_state(void) __attribute__ ((__const__));
  255. __END_DECLS
  256. #define _res (*__res_state())
  257. #if 0
  258. #define fp_nquery __fp_nquery
  259. #define fp_query __fp_query
  260. #define hostalias __hostalias
  261. #define p_query __p_query
  262. #endif
  263. #define res_close __res_close
  264. #define res_init __res_init
  265. #if 0
  266. #define res_isourserver __res_isourserver
  267. #endif
  268. #define res_mkquery __res_mkquery
  269. #define res_query __res_query
  270. #define res_querydomain __res_querydomain
  271. #define res_search __res_search
  272. #if 0
  273. #define res_send __res_send
  274. #endif
  275. __BEGIN_DECLS
  276. #if 0
  277. void fp_nquery (const u_char *, int, FILE *) __THROW;
  278. void fp_query (const u_char *, FILE *) __THROW;
  279. const char * hostalias (const char *) __THROW;
  280. void p_query (const u_char *) __THROW;
  281. #endif
  282. #ifdef __UCLIBC_HAS_BSD_RES_CLOSE__
  283. void res_close (void) __THROW;
  284. #endif
  285. int res_init (void) __THROW;
  286. libc_hidden_proto(res_init)
  287. #if 0
  288. int res_isourserver (const struct sockaddr_in *) __THROW;
  289. #endif
  290. int res_mkquery (int, const char *, int, int, const u_char *,
  291. int, const u_char *, u_char *, int) __THROW;
  292. int res_query (const char *, int, int, u_char *, int) __THROW;
  293. libc_hidden_proto(res_query)
  294. int res_querydomain (const char *, const char *, int, int,
  295. u_char *, int) __THROW;
  296. libc_hidden_proto(res_querydomain)
  297. int res_search (const char *, int, int, u_char *, int) __THROW;
  298. #if 0
  299. int res_send (const u_char *, int, u_char *, int) __THROW;
  300. #endif
  301. __END_DECLS
  302. #ifdef __UCLIBC_HAS_BSD_B64_NTOP_B64_PTON__
  303. #define b64_ntop __b64_ntop
  304. #define b64_pton __b64_pton
  305. #endif
  306. #if 0
  307. #define dn_count_labels __dn_count_labels
  308. #endif
  309. #define dn_comp __dn_comp
  310. #define dn_expand __dn_expand
  311. #define dn_skipname __dn_skipname
  312. #define res_ninit __res_ninit
  313. #define res_nclose __res_nclose
  314. #if 0
  315. #define fp_resstat __fp_resstat
  316. #define loc_aton __loc_aton
  317. #define loc_ntoa __loc_ntoa
  318. #define p_cdname __p_cdname
  319. #define p_cdnname __p_cdnname
  320. #define p_class __p_class
  321. #define p_fqname __p_fqname
  322. #define p_fqnname __p_fqnname
  323. #define p_option __p_option
  324. #define p_secstodate __p_secstodate
  325. #define p_section __p_section
  326. #define p_time __p_time
  327. #define p_type __p_type
  328. #define p_rcode __p_rcode
  329. #define putlong __putlong
  330. #define putshort __putshort
  331. #define res_dnok __res_dnok
  332. #define res_hnok __res_hnok
  333. #define res_hostalias __res_hostalias
  334. #define res_mailok __res_mailok
  335. #define res_nameinquery __res_nameinquery
  336. #define res_nmkquery __res_nmkquery
  337. #define res_npquery __res_npquery
  338. #define res_nquery __res_nquery
  339. #define res_nquerydomain __res_nquerydomain
  340. #define res_nsearch __res_nsearch
  341. #define res_nsend __res_nsend
  342. #define res_nisourserver __res_nisourserver
  343. #define res_ownok __res_ownok
  344. #define res_queriesmatch __res_queriesmatch
  345. #define res_randomid __res_randomid
  346. #define sym_ntop __sym_ntop
  347. #define sym_ntos __sym_ntos
  348. #define sym_ston __sym_ston
  349. #endif
  350. __BEGIN_DECLS
  351. #if 0
  352. int res_hnok (const char *) __THROW;
  353. int res_ownok (const char *) __THROW;
  354. int res_mailok (const char *) __THROW;
  355. int res_dnok (const char *) __THROW;
  356. int sym_ston (const struct res_sym *, const char *, int *) __THROW;
  357. const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
  358. const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
  359. #endif
  360. #ifdef __UCLIBC_HAS_BSD_B64_NTOP_B64_PTON__
  361. int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
  362. int b64_pton (char const *, u_char *, size_t) __THROW;
  363. #endif
  364. #if 0
  365. int loc_aton (const char *ascii, u_char *binary) __THROW;
  366. const char * loc_ntoa (const u_char *binary, char *ascii) __THROW;
  367. void putlong (u_int32_t, u_char *) __THROW;
  368. void putshort (u_int16_t, u_char *) __THROW;
  369. const char * p_class (int) __THROW;
  370. const char * p_time (u_int32_t) __THROW;
  371. const char * p_type (int) __THROW;
  372. const char * p_rcode (int) __THROW;
  373. const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
  374. __THROW;
  375. const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
  376. const u_char * p_fqnname (const u_char *cp, const u_char *msg,
  377. int, char *, int) __THROW;
  378. const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
  379. const char * p_option (u_long option) __THROW;
  380. char * p_secstodate (u_long) __THROW;
  381. int dn_count_labels (const char *) __THROW;
  382. #endif
  383. int dn_skipname (const u_char *, const u_char *) __THROW;
  384. libc_hidden_proto(dn_skipname)
  385. int dn_comp (const char *, u_char *, int, u_char **, u_char **)
  386. __THROW;
  387. libc_hidden_proto(dn_comp)
  388. int dn_expand (const u_char *, const u_char *, const u_char *,
  389. char *, int) __THROW;
  390. libc_hidden_proto(dn_expand)
  391. int res_ninit (res_state) __THROW;
  392. void res_nclose (res_state) __THROW;
  393. #if 0
  394. u_int res_randomid (void) __THROW;
  395. int res_nameinquery (const char *, int, int,
  396. const u_char *, const u_char *) __THROW;
  397. int res_queriesmatch (const u_char *, const u_char *,
  398. const u_char *, const u_char *) __THROW;
  399. const char * p_section (int section, int opcode) __THROW;
  400. /* Things involving a resolver context. */
  401. int res_nisourserver (const res_state,
  402. const struct sockaddr_in *) __THROW;
  403. void fp_resstat (const res_state, FILE *) __THROW;
  404. void res_npquery (const res_state, const u_char *, int, FILE *)
  405. __THROW;
  406. const char * res_hostalias (const res_state, const char *, char *, size_t)
  407. __THROW;
  408. int res_nquery (res_state, const char *, int, int, u_char *, int)
  409. __THROW;
  410. int res_nsearch (res_state, const char *, int, int, u_char *, int)
  411. __THROW;
  412. int res_nquerydomain (res_state, const char *, const char *, int,
  413. int, u_char *, int) __THROW;
  414. int res_nmkquery (res_state, int, const char *, int, int,
  415. const u_char *, int, const u_char *, u_char *,
  416. int) __THROW;
  417. int res_nsend (res_state, const u_char *, int, u_char *, int)
  418. __THROW;
  419. #endif
  420. __END_DECLS
  421. # if _LIBC
  422. # ifdef __UCLIBC_HAS_THREADS__
  423. # if defined __UCLIBC_HAS_TLS__ \
  424. && (!defined NOT_IN_libc || defined IS_IN_libpthread)
  425. # undef _res
  426. # ifndef NOT_IN_libc
  427. # define __resp __libc_resp
  428. # endif
  429. # define _res (*__resp)
  430. extern __thread struct __res_state *__resp attribute_tls_model_ie;
  431. # endif
  432. # else
  433. # undef _res
  434. # define _res (*__resp)
  435. extern struct __res_state *__resp;
  436. # endif /* __UCLIBC_HAS_THREADS__ */
  437. # endif /* _LIBC */
  438. #endif /* _RESOLV_H_ */
  439. #endif /* !_RESOLV_H_ */