1 /*- 2 * SPDX-License-Identifier: (ISC AND BSD-3-Clause) 3 * 4 * Portions Copyright (C) 2004, 2005, 2008, 2009 Internet Systems Consortium, Inc. ("ISC") 5 * Portions Copyright (C) 1995-2003 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Copyright (c) 1983, 1987, 1989 22 * The Regents of the University of California. All rights reserved. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 1. Redistributions of source code must retain the above copyright 28 * notice, this list of conditions and the following disclaimer. 29 * 2. Redistributions in binary form must reproduce the above copyright 30 * notice, this list of conditions and the following disclaimer in the 31 * documentation and/or other materials provided with the distribution. 32 * 3. Neither the name of the University nor the names of its contributors 33 * may be used to endorse or promote products derived from this software 34 * without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 */ 48 49 /*% 50 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 51 * $Id: resolv.h,v 1.30 2009/03/03 01:52:48 each Exp $ 52 * $FreeBSD$ 53 */ 54 55 #ifndef _RESOLV_H_ 56 #define _RESOLV_H_ 57 58 #include <sys/param.h> 59 #include <sys/types.h> 60 #include <sys/cdefs.h> 61 #include <sys/socket.h> 62 #include <stdio.h> 63 #include <arpa/nameser.h> 64 65 /*% 66 * Revision information. This is the release date in YYYYMMDD format. 67 * It can change every day so the right thing to do with it is use it 68 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 69 * compare for equality; rather, use it to determine whether your resolver 70 * is new enough to contain a certain feature. 71 */ 72 73 #define __RES 20090302 74 75 /*% 76 * This used to be defined in res_query.c, now it's in herror.c. 77 * [XXX no it's not. It's in irs/irs_data.c] 78 * It was 79 * never extern'd by any *.h file before it was placed here. For thread 80 * aware programs, the last h_errno value set is stored in res->h_errno. 81 * 82 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO 83 * (and __h_errno_set) to the public via <resolv.h>. 84 * XXX: __h_errno_set is really part of IRS, not part of the resolver. 85 * If somebody wants to build and use a resolver that doesn't use IRS, 86 * what do they do? Perhaps something like 87 * #ifdef WANT_IRS 88 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) 89 * #else 90 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) 91 * #endif 92 */ 93 94 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) 95 struct __res_state; /*%< forward */ 96 __BEGIN_DECLS 97 void __h_errno_set(struct __res_state *, int); 98 __END_DECLS 99 100 /*% 101 * Resolver configuration file. 102 * Normally not present, but may contain the address of the 103 * initial name server(s) to query and the domain search list. 104 */ 105 106 #ifndef _PATH_RESCONF 107 #define _PATH_RESCONF "/etc/resolv.conf" 108 #endif 109 110 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 111 res_sendhookact; 112 113 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *, 114 const u_char **, int *, 115 u_char *, int, int *); 116 117 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *, 118 const u_char *, int, u_char *, 119 int, int *); 120 121 struct res_sym { 122 int number; /*%< Identifying number, like T_MX */ 123 const char * name; /*%< Its symbolic name, like "MX" */ 124 const char * humanname; /*%< Its fun name, like "mail exchanger" */ 125 }; 126 127 /*% 128 * Global defines and variables for resolver stub. 129 */ 130 #define MAXNS 3 /*%< max # name servers we'll track */ 131 #define MAXDFLSRCH 3 /*%< # default domain levels to try */ 132 #define MAXDNSRCH 6 /*%< max # domains in search path */ 133 #define LOCALDOMAINPARTS 2 /*%< min levels in name that is "local" */ 134 #define RES_TIMEOUT 5 /*%< min. seconds between retries */ 135 #define MAXRESOLVSORT 10 /*%< number of net to sort on */ 136 #define RES_MAXNDOTS 15 /*%< should reflect bit field size */ 137 #define RES_MAXRETRANS 30 /*%< only for resolv.conf/RES_OPTIONS */ 138 #define RES_MAXRETRY 5 /*%< only for resolv.conf/RES_OPTIONS */ 139 #define RES_DFLRETRY 2 /*%< Default #/tries. */ 140 #define RES_MAXTIME 65535 /*%< Infinity, in milliseconds. */ 141 struct __res_state_ext; 142 143 struct __res_state { 144 int retrans; /*%< retransmission time interval */ 145 int retry; /*%< number of times to retransmit */ 146 /* 147 * XXX: If `sun' is defined, `options' and `pfcode' are 148 * defined as u_int in original BIND9 distribution. However, 149 * it breaks binary backward compatibility against FreeBSD's 150 * resolver. So, we changed not to see `sun'. 151 */ 152 #if defined(sun) && 0 153 u_int options; /*%< option flags - see below. */ 154 #else 155 u_long options; /*%< option flags - see below. */ 156 #endif 157 int nscount; /*%< number of name servers */ 158 struct sockaddr_in 159 nsaddr_list[MAXNS]; /*%< address of name server */ 160 #define nsaddr nsaddr_list[0] /*%< for backward compatibility */ 161 u_short id; /*%< current message id */ 162 char *dnsrch[MAXDNSRCH+1]; /*%< components of domain to search */ 163 char defdname[256]; /*%< default domain (deprecated) */ 164 #if defined(sun) && 0 165 u_int pfcode; /*%< RES_PRF_ flags - see below. */ 166 #else 167 u_long pfcode; /*%< RES_PRF_ flags - see below. */ 168 #endif 169 unsigned ndots:4; /*%< threshold for initial abs. query */ 170 unsigned nsort:4; /*%< number of elements in sort_list[] */ 171 char unused[3]; 172 struct { 173 struct in_addr addr; 174 u_int32_t mask; 175 } sort_list[MAXRESOLVSORT]; 176 res_send_qhook qhook; /*%< query hook */ 177 res_send_rhook rhook; /*%< response hook */ 178 int res_h_errno; /*%< last one set for this context */ 179 int _vcsock; /*%< PRIVATE: for res_send VC i/o */ 180 u_int _flags; /*%< PRIVATE: see below */ 181 u_int _pad; /*%< make _u 64 bit aligned */ 182 union { 183 /* On an 32-bit arch this means 512b total. */ 184 char pad[72 - 4*sizeof (int) - 3*sizeof (void *)]; 185 struct { 186 u_int16_t nscount; 187 u_int16_t nstimes[MAXNS]; /*%< ms. */ 188 int nssocks[MAXNS]; 189 struct __res_state_ext *ext; /*%< extension for IPv6 */ 190 } _ext; 191 } _u; 192 u_char *_rnd; /*%< PRIVATE: random state */ 193 }; 194 195 typedef struct __res_state *res_state; 196 197 union res_sockaddr_union { 198 struct sockaddr_in sin; 199 #ifdef IN6ADDR_ANY_INIT 200 struct sockaddr_in6 sin6; 201 #endif 202 #ifdef ISC_ALIGN64 203 int64_t __align64; /*%< 64bit alignment */ 204 #else 205 int32_t __align32; /*%< 32bit alignment */ 206 #endif 207 char __space[128]; /*%< max size */ 208 }; 209 210 /*% 211 * Resolver flags (used to be discrete per-module statics ints). 212 */ 213 #define RES_F_VC 0x00000001 /*%< socket is TCP */ 214 #define RES_F_CONN 0x00000002 /*%< socket is connected */ 215 #define RES_F_EDNS0ERR 0x00000004 /*%< EDNS0 caused errors */ 216 #define RES_F__UNUSED 0x00000008 /*%< (unused) */ 217 #define RES_F_LASTMASK 0x000000F0 /*%< ordinal server of last res_nsend */ 218 #define RES_F_LASTSHIFT 4 /*%< bit position of LASTMASK "flag" */ 219 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT) 220 221 /* res_findzonecut2() options */ 222 #define RES_EXHAUSTIVE 0x00000001 /*%< always do all queries */ 223 #define RES_IPV4ONLY 0x00000002 /*%< IPv4 only */ 224 #define RES_IPV6ONLY 0x00000004 /*%< IPv6 only */ 225 226 /*% 227 * Resolver options (keep these in synch with res_debug.c, please) 228 */ 229 #define RES_INIT 0x00000001 /*%< address initialized */ 230 #define RES_DEBUG 0x00000002 /*%< print debug messages */ 231 #define RES_AAONLY 0x00000004 /*%< authoritative answers only (!IMPL)*/ 232 #define RES_USEVC 0x00000008 /*%< use virtual circuit */ 233 #define RES_PRIMARY 0x00000010 /*%< query primary server only (!IMPL) */ 234 #define RES_IGNTC 0x00000020 /*%< ignore truncation errors */ 235 #define RES_RECURSE 0x00000040 /*%< recursion desired */ 236 #define RES_DEFNAMES 0x00000080 /*%< use default domain name */ 237 #define RES_STAYOPEN 0x00000100 /*%< Keep TCP socket open */ 238 #define RES_DNSRCH 0x00000200 /*%< search up local domain tree */ 239 #define RES_INSECURE1 0x00000400 /*%< type 1 security disabled */ 240 #define RES_INSECURE2 0x00000800 /*%< type 2 security disabled */ 241 #define RES_NOALIASES 0x00001000 /*%< shuts off HOSTALIASES feature */ 242 #define RES_USE_INET6 0x00002000 /*%< use/map IPv6 in gethostbyname() */ 243 #define RES_ROTATE 0x00004000 /*%< rotate ns list after each query */ 244 #define RES_NOCHECKNAME 0x00008000 /*%< do not check names for sanity. */ 245 #define RES_KEEPTSIG 0x00010000 /*%< do not strip TSIG records */ 246 #define RES_BLAST 0x00020000 /*%< blast all recursive servers */ 247 #define RES_NSID 0x00040000 /*%< request name server ID */ 248 #define RES_NOTLDQUERY 0x00100000 /*%< don't unqualified name as a tld */ 249 #define RES_USE_DNSSEC 0x00200000 /*%< use DNSSEC using OK bit in OPT */ 250 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */ 251 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 252 #define RES_USE_DNAME 0x10000000 /*%< use DNAME */ 253 #define RES_USE_EDNS0 0x40000000 /*%< use EDNS0 if configured */ 254 #define RES_NO_NIBBLE2 0x80000000 /*%< disable alternate nibble lookup */ 255 256 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | \ 257 RES_DNSRCH | RES_NO_NIBBLE2) 258 259 /*% 260 * Resolver "pfcode" values. Used by dig. 261 */ 262 #define RES_PRF_STATS 0x00000001 263 #define RES_PRF_UPDATE 0x00000002 264 #define RES_PRF_CLASS 0x00000004 265 #define RES_PRF_CMD 0x00000008 266 #define RES_PRF_QUES 0x00000010 267 #define RES_PRF_ANS 0x00000020 268 #define RES_PRF_AUTH 0x00000040 269 #define RES_PRF_ADD 0x00000080 270 #define RES_PRF_HEAD1 0x00000100 271 #define RES_PRF_HEAD2 0x00000200 272 #define RES_PRF_TTLID 0x00000400 273 #define RES_PRF_HEADX 0x00000800 274 #define RES_PRF_QUERY 0x00001000 275 #define RES_PRF_REPLY 0x00002000 276 #define RES_PRF_INIT 0x00004000 277 #define RES_PRF_TRUNC 0x00008000 278 /* 0x00010000 */ 279 280 /* Things involving an internal (static) resolver context. */ 281 __BEGIN_DECLS 282 extern struct __res_state *__res_state(void); 283 __END_DECLS 284 #define _res (*__res_state()) 285 286 #ifndef __BIND_NOSTATIC 287 #define fp_nquery __fp_nquery 288 #define fp_query __fp_query 289 #define hostalias __hostalias 290 #define p_query __p_query 291 #define res_close __res_close 292 #define res_init __res_init 293 #define res_isourserver __res_isourserver 294 #define res_mkquery __res_mkquery 295 #define res_opt __res_opt 296 #define res_query __res_query 297 #define res_querydomain __res_querydomain 298 #define res_search __res_search 299 #define res_send __res_send 300 #define res_sendsigned __res_sendsigned 301 302 __BEGIN_DECLS 303 void fp_nquery(const u_char *, int, FILE *); 304 void fp_query(const u_char *, FILE *); 305 const char * hostalias(const char *); 306 void p_query(const u_char *); 307 void res_close(void); 308 int res_init(void); 309 int res_isourserver(const struct sockaddr_in *); 310 int res_mkquery(int, const char *, int, int, const u_char *, 311 int, const u_char *, u_char *, int); 312 int res_opt(int, u_char *, int, int); 313 int res_query(const char *, int, int, u_char *, int); 314 int res_querydomain(const char *, const char *, int, int, 315 u_char *, int); 316 int res_search(const char *, int, int, u_char *, int); 317 int res_send(const u_char *, int, u_char *, int); 318 int res_sendsigned(const u_char *, int, ns_tsig_key *, 319 u_char *, int); 320 __END_DECLS 321 #endif 322 323 #if !defined(SHARED_LIBBIND) || defined(LIB) 324 /* 325 * If libbind is a shared object (well, DLL anyway) 326 * these externs break the linker when resolv.h is 327 * included by a lib client (like named) 328 * Make them go away if a client is including this 329 * 330 */ 331 extern const struct res_sym __p_key_syms[]; 332 extern const struct res_sym __p_cert_syms[]; 333 extern const struct res_sym __p_class_syms[]; 334 extern const struct res_sym __p_type_syms[]; 335 extern const struct res_sym __p_rcode_syms[]; 336 #endif /* SHARED_LIBBIND */ 337 338 #define b64_ntop __b64_ntop 339 #define b64_pton __b64_pton 340 #define dn_comp __dn_comp 341 #define dn_count_labels __dn_count_labels 342 #define dn_expand __dn_expand 343 #define dn_skipname __dn_skipname 344 #define fp_resstat __fp_resstat 345 #define loc_aton __loc_aton 346 #define loc_ntoa __loc_ntoa 347 #define p_cdname __p_cdname 348 #define p_cdnname __p_cdnname 349 #define p_class __p_class 350 #define p_fqname __p_fqname 351 #define p_fqnname __p_fqnname 352 #define p_option __p_option 353 #define p_secstodate __p_secstodate 354 #define p_section __p_section 355 #define p_time __p_time 356 #define p_type __p_type 357 #define p_rcode __p_rcode 358 #define p_sockun __p_sockun 359 #define putlong __putlong 360 #define putshort __putshort 361 #define res_dnok __res_dnok 362 #if 0 363 #define res_findzonecut __res_findzonecut 364 #endif 365 #define res_findzonecut2 __res_findzonecut2 366 #define res_hnok __res_hnok 367 #define res_hostalias __res_hostalias 368 #define res_mailok __res_mailok 369 #define res_nameinquery __res_nameinquery 370 #define res_nclose __res_nclose 371 #define res_ninit __res_ninit 372 #define res_nmkquery __res_nmkquery 373 #define res_pquery __res_pquery 374 #define res_nquery __res_nquery 375 #define res_nquerydomain __res_nquerydomain 376 #define res_nsearch __res_nsearch 377 #define res_nsend __res_nsend 378 #if 0 379 #define res_nsendsigned __res_nsendsigned 380 #endif 381 #define res_nisourserver __res_nisourserver 382 #define res_ownok __res_ownok 383 #define res_queriesmatch __res_queriesmatch 384 #define res_rndinit __res_rndinit 385 #define res_randomid __res_randomid 386 #define res_nrandomid __res_nrandomid 387 #define sym_ntop __sym_ntop 388 #define sym_ntos __sym_ntos 389 #define sym_ston __sym_ston 390 #define res_nopt __res_nopt 391 #define res_nopt_rdata __res_nopt_rdata 392 #define res_ndestroy __res_ndestroy 393 #define res_nametoclass __res_nametoclass 394 #define res_nametotype __res_nametotype 395 #define res_setservers __res_setservers 396 #define res_getservers __res_getservers 397 #if 0 398 #define res_buildprotolist __res_buildprotolist 399 #define res_destroyprotolist __res_destroyprotolist 400 #define res_destroyservicelist __res_destroyservicelist 401 #define res_get_nibblesuffix __res_get_nibblesuffix 402 #define res_get_nibblesuffix2 __res_get_nibblesuffix2 403 #endif 404 #define res_ourserver_p __res_ourserver_p 405 #if 0 406 #define res_protocolname __res_protocolname 407 #define res_protocolnumber __res_protocolnumber 408 #endif 409 #define res_send_setqhook __res_send_setqhook 410 #define res_send_setrhook __res_send_setrhook 411 #if 0 412 #define res_servicename __res_servicename 413 #define res_servicenumber __res_servicenumber 414 #endif 415 __BEGIN_DECLS 416 int res_hnok(const char *); 417 int res_ownok(const char *); 418 int res_mailok(const char *); 419 int res_dnok(const char *); 420 int sym_ston(const struct res_sym *, const char *, int *); 421 const char * sym_ntos(const struct res_sym *, int, int *); 422 const char * sym_ntop(const struct res_sym *, int, int *); 423 int b64_ntop(u_char const *, size_t, char *, size_t); 424 int b64_pton(char const *, u_char *, size_t); 425 int loc_aton(const char *, u_char *); 426 const char * loc_ntoa(const u_char *, char *); 427 int dn_skipname(const u_char *, const u_char *); 428 void putlong(u_int32_t, u_char *); 429 void putshort(u_int16_t, u_char *); 430 #ifndef __ultrix__ 431 u_int16_t _getshort(const u_char *); 432 u_int32_t _getlong(const u_char *); 433 #endif 434 const char * p_class(int); 435 const char * p_time(u_int32_t); 436 const char * p_type(int); 437 const char * p_rcode(int); 438 const char * p_sockun(union res_sockaddr_union, char *, size_t); 439 const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); 440 const u_char * p_cdname(const u_char *, const u_char *, FILE *); 441 const u_char * p_fqnname(const u_char *, const u_char *, int, char *, int); 442 const u_char * p_fqname(const u_char *, const u_char *, FILE *); 443 const char * p_option(u_long); 444 char * p_secstodate(u_long); 445 int dn_count_labels(const char *); 446 int dn_comp(const char *, u_char *, int, u_char **, u_char **); 447 int dn_expand(const u_char *, const u_char *, const u_char *, 448 char *, int); 449 void res_rndinit(res_state); 450 u_int res_randomid(void); 451 u_int res_nrandomid(res_state); 452 int res_nameinquery(const char *, int, int, const u_char *, 453 const u_char *); 454 int res_queriesmatch(const u_char *, const u_char *, 455 const u_char *, const u_char *); 456 const char * p_section(int, int); 457 /* Things involving a resolver context. */ 458 int res_ninit(res_state); 459 int res_nisourserver(const res_state, const struct sockaddr_in *); 460 void fp_resstat(const res_state, FILE *); 461 void res_pquery(const res_state, const u_char *, int, FILE *); 462 const char * res_hostalias(const res_state, const char *, char *, size_t); 463 int res_nquery(res_state, const char *, int, int, u_char *, int); 464 int res_nsearch(res_state, const char *, int, int, u_char *, int); 465 int res_nquerydomain(res_state, const char *, const char *, 466 int, int, u_char *, int); 467 int res_nmkquery(res_state, int, const char *, int, int, 468 const u_char *, int, const u_char *, 469 u_char *, int); 470 int res_nsend(res_state, const u_char *, int, u_char *, int); 471 #if 0 472 int res_nsendsigned(res_state, const u_char *, int, 473 ns_tsig_key *, u_char *, int); 474 int res_findzonecut(res_state, const char *, ns_class, int, 475 char *, size_t, struct in_addr *, int); 476 #endif 477 int res_findzonecut2(res_state, const char *, ns_class, int, 478 char *, size_t, 479 union res_sockaddr_union *, int); 480 void res_nclose(res_state); 481 int res_nopt(res_state, int, u_char *, int, int); 482 int res_nopt_rdata(res_state, int, u_char *, int, u_char *, 483 u_short, u_short, u_char *); 484 void res_send_setqhook(res_send_qhook); 485 void res_send_setrhook(res_send_rhook); 486 int __res_vinit(res_state, int); 487 #if 0 488 void res_destroyservicelist(void); 489 const char * res_servicename(u_int16_t, const char *); 490 const char * res_protocolname(int); 491 void res_destroyprotolist(void); 492 void res_buildprotolist(void); 493 const char * res_get_nibblesuffix(res_state); 494 const char * res_get_nibblesuffix2(res_state); 495 #endif 496 void res_ndestroy(res_state); 497 u_int16_t res_nametoclass(const char *, int *); 498 u_int16_t res_nametotype(const char *, int *); 499 void res_setservers(res_state, const union res_sockaddr_union *, 500 int); 501 int res_getservers(res_state, union res_sockaddr_union *, int); 502 __END_DECLS 503 504 #endif /* !_RESOLV_H_ */ 505 /*! \file */ 506