1 /* $NetBSD: resolv.h,v 1.31 2005/12/26 19:01:47 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1987, 1989 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 34 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 35 * 36 * Permission to use, copy, modify, and distribute this software for any 37 * purpose with or without fee is hereby granted, provided that the above 38 * copyright notice and this permission notice appear in all copies. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 41 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 42 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 43 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 44 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 45 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 46 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 47 */ 48 49 /* 50 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 51 * Id: resolv.h,v 1.7.2.11.4.2 2004/06/25 00:41:05 marka Exp 52 */ 53 54 #ifndef _RESOLV_PRIVATE_H_ 55 #define _RESOLV_PRIVATE_H_ 56 57 #include <sys/cdefs.h> 58 59 #include <resolv.h> 60 #include "resolv_static.h" 61 #include <net/if.h> 62 63 /* Despite this file's name, it's part of libresolv. On Android, that means it's part of libc :-( */ 64 #pragma GCC visibility push(default) 65 66 /* 67 * Revision information. This is the release date in YYYYMMDD format. 68 * It can change every day so the right thing to do with it is use it 69 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 70 * compare for equality; rather, use it to determine whether your resolver 71 * is new enough to contain a certain feature. 72 */ 73 74 #define __RES 20030124 75 76 /* 77 * This used to be defined in res_query.c, now it's in herror.c. 78 * [XXX no it's not. It's in irs/irs_data.c] 79 * It was 80 * never extern'd by any *.h file before it was placed here. For thread 81 * aware programs, the last h_errno value set is stored in res->h_errno. 82 * 83 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO 84 * (and __h_errno_set) to the public via <resolv.h>. 85 * XXX: __h_errno_set is really part of IRS, not part of the resolver. 86 * If somebody wants to build and use a resolver that doesn't use IRS, 87 * what do they do? Perhaps something like 88 * #ifdef WANT_IRS 89 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) 90 * #else 91 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) 92 * #endif 93 */ 94 95 #define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) 96 struct __res_state; /* forward */ 97 98 /* 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. 102 */ 103 104 #ifndef _PATH_RESCONF 105 #ifdef ANDROID_CHANGES 106 #define _PATH_RESCONF "/etc/ppp/resolv.conf" 107 #else 108 #define _PATH_RESCONF "/etc/resolv.conf" 109 #endif 110 #endif 111 112 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 113 res_sendhookact; 114 115 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *, 116 const u_char **, int *, 117 u_char *, int, int *); 118 119 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *, 120 const u_char *, int, u_char *, 121 int, int *); 122 123 struct res_sym { 124 int number; /* Identifying number, like T_MX */ 125 const char * name; /* Its symbolic name, like "MX" */ 126 const char * humanname; /* Its fun name, like "mail exchanger" */ 127 }; 128 129 /* 130 * Global defines and variables for resolver stub. 131 */ 132 #define MAXNS 3 /* max # name servers we'll track */ 133 #define MAXDFLSRCH 3 /* # default domain levels to try */ 134 #define MAXDNSRCH 6 /* max # domains in search path */ 135 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 136 137 #define RES_TIMEOUT 5 /* min. seconds between retries */ 138 #define MAXRESOLVSORT 10 /* number of net to sort on */ 139 #define RES_MAXNDOTS 15 /* should reflect bit field size */ 140 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ 141 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ 142 #define RES_DFLRETRY 2 /* Default #/tries. */ 143 #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ 144 145 struct __res_state_ext; 146 147 struct __res_state { 148 unsigned netid; /* NetId: cache key and socket mark */ 149 int retrans; /* retransmission time interval */ 150 int retry; /* number of times to retransmit */ 151 #ifdef sun 152 u_int options; /* option flags - see below. */ 153 #else 154 u_long options; /* option flags - see below. */ 155 #endif 156 int nscount; /* number of name servers */ 157 struct sockaddr_in 158 nsaddr_list[MAXNS]; /* address of name server */ 159 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 160 u_short id; /* current message id */ 161 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 162 char defdname[256]; /* default domain (deprecated) */ 163 #ifdef sun 164 u_int pfcode; /* RES_PRF_ flags - see below. */ 165 #else 166 u_long pfcode; /* RES_PRF_ flags - see below. */ 167 #endif 168 unsigned ndots:4; /* threshold for initial abs. query */ 169 unsigned nsort:4; /* number of elements in sort_list[] */ 170 char unused[3]; 171 struct { 172 struct in_addr addr; 173 uint32_t mask; 174 } sort_list[MAXRESOLVSORT]; 175 #ifdef __OLD_RES_STATE 176 char lookups[4]; 177 #else 178 res_send_qhook qhook; /* query hook */ 179 res_send_rhook rhook; /* response hook */ 180 int res_h_errno; /* last one set for this context */ 181 unsigned _mark; /* If non-0 SET_MARK to _mark on all request sockets */ 182 int _vcsock; /* PRIVATE: for res_send VC i/o */ 183 u_int _flags; /* PRIVATE: see below */ 184 u_int _pad; /* make _u 64 bit aligned */ 185 union { 186 /* On an 32-bit arch this means 512b total. */ 187 char pad[72 - 4*sizeof (int) - 2*sizeof (void *)]; 188 struct { 189 uint16_t nscount; 190 uint16_t nstimes[MAXNS]; /* ms. */ 191 int nssocks[MAXNS]; 192 struct __res_state_ext *ext; /* extention for IPv6 */ 193 } _ext; 194 } _u; 195 #endif 196 struct res_static rstatic[1]; 197 }; 198 199 typedef struct __res_state *res_state; 200 201 union res_sockaddr_union { 202 struct sockaddr_in sin; 203 #ifdef IN6ADDR_ANY_INIT 204 struct sockaddr_in6 sin6; 205 #endif 206 #ifdef ISC_ALIGN64 207 int64_t __align64; /* 64bit alignment */ 208 #else 209 int32_t __align32; /* 32bit alignment */ 210 #endif 211 char __space[128]; /* max size */ 212 }; 213 214 /* 215 * Resolver flags (used to be discrete per-module statics ints). 216 */ 217 #define RES_F_VC 0x00000001 /* socket is TCP */ 218 #define RES_F_CONN 0x00000002 /* socket is connected */ 219 #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */ 220 #define RES_F__UNUSED 0x00000008 /* (unused) */ 221 #define RES_F_LASTMASK 0x000000F0 /* ordinal server of last res_nsend */ 222 #define RES_F_LASTSHIFT 4 /* bit position of LASTMASK "flag" */ 223 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT) 224 225 /* res_findzonecut2() options */ 226 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ 227 #define RES_IPV4ONLY 0x00000002 /* IPv4 only */ 228 #define RES_IPV6ONLY 0x00000004 /* IPv6 only */ 229 230 /* 231 * Resolver options (keep these in synch with res_debug.c, please) 232 */ 233 #define RES_INIT 0x00000001 /* address initialized */ 234 #define RES_DEBUG 0x00000002 /* print debug messages */ 235 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 236 #define RES_USEVC 0x00000008 /* use virtual circuit */ 237 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 238 #define RES_IGNTC 0x00000020 /* ignore trucation errors */ 239 #define RES_RECURSE 0x00000040 /* recursion desired */ 240 #define RES_DEFNAMES 0x00000080 /* use default domain name */ 241 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 242 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ 243 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 244 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 245 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 246 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 247 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */ 248 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ 249 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ 250 #define RES_BLAST 0x00020000 /* blast all recursive servers */ 251 #define RES_NOTLDQUERY 0x00100000 /* don't unqualified name as a tld */ 252 #define RES_USE_DNSSEC 0x00200000 /* use DNSSEC using OK bit in OPT */ 253 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */ 254 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 255 #define RES_USE_DNAME 0x10000000 /* use DNAME */ 256 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */ 257 #define RES_NO_NIBBLE2 0x80000000 /* disable alternate nibble lookup */ 258 259 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | \ 260 RES_DNSRCH | RES_NO_NIBBLE2) 261 262 /* 263 * Resolver "pfcode" values. Used by dig. 264 */ 265 #define RES_PRF_STATS 0x00000001 266 #define RES_PRF_UPDATE 0x00000002 267 #define RES_PRF_CLASS 0x00000004 268 #define RES_PRF_CMD 0x00000008 269 #define RES_PRF_QUES 0x00000010 270 #define RES_PRF_ANS 0x00000020 271 #define RES_PRF_AUTH 0x00000040 272 #define RES_PRF_ADD 0x00000080 273 #define RES_PRF_HEAD1 0x00000100 274 #define RES_PRF_HEAD2 0x00000200 275 #define RES_PRF_TTLID 0x00000400 276 #define RES_PRF_HEADX 0x00000800 277 #define RES_PRF_QUERY 0x00001000 278 #define RES_PRF_REPLY 0x00002000 279 #define RES_PRF_INIT 0x00004000 280 #define RES_PRF_TRUNC 0x00008000 281 /* 0x00010000 */ 282 283 /* Things involving an internal (static) resolver context. */ 284 __BEGIN_DECLS 285 286 __LIBC_HIDDEN__ extern struct __res_state *__res_get_state(void); 287 __LIBC_HIDDEN__ extern void __res_put_state(struct __res_state *); 288 289 #ifndef ANDROID_CHANGES 290 /* 291 * Source and Binary compatibility; _res will not work properly 292 * with multi-threaded programs. 293 */ 294 extern struct __res_state *__res_state(void); 295 #define _res (*__res_state()) 296 #endif 297 298 __END_DECLS 299 300 #ifndef __BIND_NOSTATIC 301 #define fp_nquery __fp_nquery 302 #define fp_query __fp_query 303 #define hostalias __hostalias 304 #define p_query __p_query 305 #define res_close __res_close 306 #define res_opt __res_opt 307 #define res_isourserver __res_isourserver 308 #define res_querydomain __res_querydomain 309 #define res_send __res_send 310 #define res_sendsigned __res_sendsigned 311 312 #ifdef BIND_RES_POSIX3 313 #define dn_expand __dn_expand 314 #define res_init __res_init 315 #define res_query __res_query 316 #define res_search __res_search 317 #define res_mkquery __res_mkquery 318 #endif 319 320 __BEGIN_DECLS 321 void fp_nquery(const u_char *, int, FILE *); 322 void fp_query(const u_char *, FILE *); 323 const char * hostalias(const char *); 324 void p_query(const u_char *); 325 void res_close(void); 326 int res_init(void); 327 __LIBC_HIDDEN__ int res_opt(int, u_char *, int, int); 328 int res_isourserver(const struct sockaddr_in *); 329 int res_mkquery(int, const char *, int, int, const u_char *, int, const u_char *, u_char *, int); 330 int res_query(const char *, int, int, u_char *, int); 331 int res_querydomain(const char *, const char *, int, int, u_char *, int); 332 int res_search(const char *, int, int, u_char *, int); 333 int res_send(const u_char *, int, u_char *, int); 334 int res_sendsigned(const u_char *, int, ns_tsig_key *, u_char *, int); 335 __END_DECLS 336 #endif 337 338 #if !defined(SHARED_LIBBIND) || defined(LIB) 339 /* 340 * If libbind is a shared object (well, DLL anyway) 341 * these externs break the linker when resolv.h is 342 * included by a lib client (like named) 343 * Make them go away if a client is including this 344 * 345 */ 346 __LIBC_HIDDEN__ extern const struct res_sym __p_key_syms[]; 347 __LIBC_HIDDEN__ extern const struct res_sym __p_cert_syms[]; 348 extern const struct res_sym __p_class_syms[]; 349 extern const struct res_sym __p_type_syms[]; 350 __LIBC_HIDDEN__ extern const struct res_sym __p_rcode_syms[]; 351 #endif /* SHARED_LIBBIND */ 352 353 #ifndef ANDROID_CHANGES 354 #define dn_comp __dn_comp 355 #endif 356 #define dn_count_labels __dn_count_labels 357 #define dn_skipname __dn_skipname 358 #define fp_resstat __fp_resstat 359 #define loc_aton __loc_aton 360 #define loc_ntoa __loc_ntoa 361 #define p_cdname __p_cdname 362 #define p_cdnname __p_cdnname 363 #define p_class __p_class 364 #define p_fqname __p_fqname 365 #define p_fqnname __p_fqnname 366 #define p_option __p_option 367 #define p_secstodate __p_secstodate 368 #define p_section __p_section 369 #define p_time __p_time 370 #define p_type __p_type 371 #define p_rcode __p_rcode 372 #define p_sockun __p_sockun 373 #define putlong __putlong 374 #define putshort __putshort 375 #define res_dnok __res_dnok 376 #define res_findzonecut __res_findzonecut 377 #define res_findzonecut2 __res_findzonecut2 378 #define res_hnok __res_hnok 379 #define res_hostalias __res_hostalias 380 #define res_mailok __res_mailok 381 #define res_nameinquery __res_nameinquery 382 #define res_nclose __res_nclose 383 #define res_ninit __res_ninit 384 #define res_nmkquery __res_nmkquery 385 #define res_pquery __res_pquery 386 #define res_nquery __res_nquery 387 #define res_nquerydomain __res_nquerydomain 388 #define res_nsearch __res_nsearch 389 #define res_nsend __res_nsend 390 #define res_nsendsigned __res_nsendsigned 391 #define res_nisourserver __res_nisourserver 392 #define res_ownok __res_ownok 393 #define res_queriesmatch __res_queriesmatch 394 #define res_randomid __res_randomid 395 #define sym_ntop __sym_ntop 396 #define sym_ntos __sym_ntos 397 #define sym_ston __sym_ston 398 #define res_nopt __res_nopt 399 #define res_ndestroy __res_ndestroy 400 #define res_nametoclass __res_nametoclass 401 #define res_nametotype __res_nametotype 402 #define res_setservers __res_setservers 403 #define res_getservers __res_getservers 404 #define res_buildprotolist __res_buildprotolist 405 #define res_destroyprotolist __res_destroyprotolist 406 #define res_destroyservicelist __res_destroyservicelist 407 #define res_get_nibblesuffix __res_get_nibblesuffix 408 #define res_get_nibblesuffix2 __res_get_nibblesuffix2 409 #define res_ourserver_p __res_ourserver_p 410 #define res_protocolname __res_protocolname 411 #define res_protocolnumber __res_protocolnumber 412 #define res_send_setqhook __res_send_setqhook 413 #define res_send_setrhook __res_send_setrhook 414 #define res_servicename __res_servicename 415 #define res_servicenumber __res_servicenumber 416 __BEGIN_DECLS 417 int res_hnok(const char *); 418 int res_ownok(const char *); 419 int res_mailok(const char *); 420 int res_dnok(const char *); 421 int sym_ston(const struct res_sym *, const char *, int *); 422 const char * sym_ntos(const struct res_sym *, int, int *); 423 const char * sym_ntop(const struct res_sym *, int, int *); 424 #ifndef ANDROID_CHANGES 425 int b64_ntop(u_char const *, size_t, char *, size_t); 426 int b64_pton(char const *, u_char *, size_t); 427 #endif 428 int loc_aton(const char *, u_char *); 429 const char * loc_ntoa(const u_char *, char *); 430 int dn_skipname(const u_char *, const u_char *); 431 void putlong(uint32_t, u_char *); 432 void putshort(uint16_t, u_char *); 433 #ifndef __ultrix__ 434 uint16_t _getshort(const u_char *); 435 uint32_t _getlong(const u_char *); 436 #endif 437 const char * p_class(int); 438 const char * p_time(uint32_t); 439 const char * p_type(int); 440 const char * p_rcode(int); 441 __LIBC_HIDDEN__ const char * p_sockun(union res_sockaddr_union, char *, size_t); 442 const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); 443 const u_char * p_cdname(const u_char *, const u_char *, FILE *); 444 const u_char * p_fqnname(const u_char *, const u_char *, 445 int, char *, int); 446 const u_char * p_fqname(const u_char *, const u_char *, FILE *); 447 const char * p_option(u_long); 448 char * p_secstodate(u_long); 449 int dn_count_labels(const char *); 450 u_int res_randomid(void); 451 int res_nameinquery(const char *, int, int, const u_char *, 452 const u_char *); 453 int res_queriesmatch(const u_char *, const u_char *, 454 const u_char *, const u_char *); 455 __LIBC_HIDDEN__ const char * p_section(int, int); 456 /* Things involving a resolver context. */ 457 int res_ninit(res_state); 458 int res_nisourserver(const res_state, const struct sockaddr_in *); 459 void fp_resstat(const res_state, FILE *); 460 __LIBC_HIDDEN__ void res_pquery(const res_state, const u_char *, int, FILE *); 461 const char * res_hostalias(const res_state, const char *, char *, size_t); 462 int res_nquery(res_state, const char *, int, int, u_char *, int); 463 int res_nsearch(res_state, const char *, int, int, u_char *, int); 464 int res_nquerydomain(res_state, const char *, const char *, 465 int, int, u_char *, int); 466 int res_nmkquery(res_state, int, const char *, int, int, 467 const u_char *, int, const u_char *, 468 u_char *, int); 469 int res_nsend(res_state, const u_char *, int, u_char *, int); 470 int res_nsendsigned(res_state, const u_char *, int, 471 ns_tsig_key *, u_char *, int); 472 int res_findzonecut(res_state, const char *, ns_class, int, 473 char *, size_t, struct in_addr *, int); 474 int res_findzonecut2(res_state, const char *, ns_class, int, 475 char *, size_t, 476 union res_sockaddr_union *, int); 477 void res_nclose(res_state); 478 __LIBC_HIDDEN__ int res_nopt(res_state, int, u_char *, int, int); 479 void res_send_setqhook(res_send_qhook); 480 void res_send_setrhook(res_send_rhook); 481 __LIBC_HIDDEN__ int __res_vinit(res_state, int); 482 void res_destroyservicelist(void); 483 const char * res_servicename(uint16_t, const char *); 484 const char * res_protocolname(int); 485 void res_destroyprotolist(void); 486 void res_buildprotolist(void); 487 __LIBC_HIDDEN__ const char * res_get_nibblesuffix(res_state); 488 __LIBC_HIDDEN__ const char * res_get_nibblesuffix2(res_state); 489 __LIBC_HIDDEN__ void res_ndestroy(res_state); 490 __LIBC_HIDDEN__ uint16_t res_nametoclass(const char *, int *); 491 __LIBC_HIDDEN__ uint16_t res_nametotype(const char *, int *); 492 __LIBC_HIDDEN__ void res_setservers(res_state, 493 const union res_sockaddr_union *, int); 494 __LIBC_HIDDEN__ int res_getservers(res_state, 495 union res_sockaddr_union *, int); 496 497 __LIBC_HIDDEN__ void res_setnetid(res_state, unsigned); 498 __LIBC_HIDDEN__ void res_setmark(res_state, unsigned); 499 u_int res_randomid(void); 500 501 #ifdef __i386__ 502 # define __socketcall extern __attribute__((__cdecl__)) 503 #else 504 # define __socketcall extern 505 #endif 506 507 __socketcall int __connect(int, const struct sockaddr*, socklen_t); 508 509 #undef __socketcall 510 511 __END_DECLS 512 513 #pragma GCC visibility pop 514 515 #endif /* !_RESOLV_PRIVATE_H_ */ 516