1 /* 2 * Copyright 2009-2012 Haiku, Inc. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 6 /* 7 * Portions Copyright (C) 2004, 2005, 2008, 2009 Internet Systems Consortium, Inc. ("ISC") 8 * Portions Copyright (C) 1995-2003 Internet Software Consortium. 9 * 10 * Permission to use, copy, modify, and/or distribute this software for any 11 * purpose with or without fee is hereby granted, provided that the above 12 * copyright notice and this permission notice appear in all copies. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 15 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 16 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 17 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 18 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 19 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 20 * PERFORMANCE OF THIS SOFTWARE. 21 */ 22 23 /* 24 * Copyright (c) 1983, 1987, 1989 25 * The Regents of the University of California. All rights reserved. 26 * 27 * Redistribution and use in source and binary forms, with or without 28 * modification, are permitted provided that the following conditions 29 * are met: 30 * 1. Redistributions of source code must retain the above copyright 31 * notice, this list of conditions and the following disclaimer. 32 * 2. Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in the 34 * documentation and/or other materials provided with the distribution. 35 * 3. All advertising materials mentioning features or use of this software 36 * must display the following acknowledgement: 37 * This product includes software developed by the University of 38 * California, Berkeley and its contributors. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 #ifndef _RESOLV_H_ 57 #define _RESOLV_H_ 58 59 #include <sys/param.h> 60 #include <sys/types.h> 61 #include <sys/cdefs.h> 62 #include <sys/socket.h> 63 #include <stdio.h> 64 #include <arpa/nameser.h> 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 20090302 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_set(r,x) 96 struct __res_state; /* forward */ 97 __BEGIN_DECLS 98 void __h_errno_set(struct __res_state *res, int err); 99 __END_DECLS 100 101 102 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 103 res_sendhookact; 104 105 #ifndef __PMT 106 #if defined(__STDC__) || defined(__cplusplus) 107 #define __PMT(args) args 108 #else 109 #define __PMT(args) () 110 #endif 111 #endif 112 113 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *, 114 const u_char **, int *, u_char *, int, int *); 115 116 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *, 117 const u_char *, int, u_char *, int, int *); 118 119 struct res_sym { 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" */ 123 }; 124 125 /* 126 * Global defines and variables for resolver stub. 127 */ 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; 140 141 struct __res_state { 142 int retrans; /* retransmission time interval */ 143 int retry; /* number of times to retransmit */ 144 #ifdef sun 145 u_int options; /* option flags - see below. */ 146 #else 147 u_long options; /* option flags - see below. */ 148 #endif 149 int nscount; /* number of name servers */ 150 struct sockaddr_in 151 nsaddr_list[MAXNS]; /* address of name server */ 152 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 153 u_short id; /* current message id */ 154 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 155 char defdname[256]; /* default domain (deprecated) */ 156 #ifdef sun 157 u_int pfcode; /* RES_PRF_ flags - see below. */ 158 #else 159 u_long pfcode; /* RES_PRF_ flags - see below. */ 160 #endif 161 unsigned ndots:4; /* threshold for initial abs. query */ 162 unsigned nsort:4; /* number of elements in sort_list[] */ 163 char unused[3]; 164 struct { 165 struct in_addr addr; 166 u_int32_t mask; 167 } sort_list[MAXRESOLVSORT]; 168 res_send_qhook qhook; /* query hook */ 169 res_send_rhook rhook; /* response hook */ 170 int res_h_errno; /* last one set for this context */ 171 int _vcsock; /* PRIVATE: for res_send VC i/o */ 172 u_int _flags; /* PRIVATE: see below */ 173 u_char _rnd[16]; /* PRIVATE: random state */ 174 u_int _pad; /* make _u 64 bit aligned */ 175 union { 176 /* On an 32-bit arch this means 512b total. */ 177 char pad[56 - 4*sizeof (int) - 2*sizeof (void *)]; 178 struct { 179 u_int16_t nscount; 180 u_int16_t nstimes[MAXNS]; /* ms. */ 181 int nssocks[MAXNS]; 182 struct __res_state_ext *ext; /* extention for IPv6 */ 183 } _ext; 184 } _u; 185 }; 186 187 typedef struct __res_state *res_state; 188 189 union res_sockaddr_union { 190 struct sockaddr_in sin; 191 struct sockaddr_in6 sin6; 192 #ifdef ISC_ALIGN64 193 int64_t __align64; /* 64bit alignment */ 194 #else 195 int32_t __align32; /* 32bit alignment */ 196 #endif 197 char __space[128]; /* max size */ 198 }; 199 200 /* 201 * Resolver flags (used to be discrete per-module statics ints). 202 */ 203 #define RES_F_VC 0x00000001 /* socket is TCP */ 204 #define RES_F_CONN 0x00000002 /* socket is connected */ 205 #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */ 206 #define RES_F__UNUSED 0x00000008 /* (unused) */ 207 #define RES_F_LASTMASK 0x000000F0 /* ordinal server of last res_nsend */ 208 #define RES_F_LASTSHIFT 4 /* bit position of LASTMASK "flag" */ 209 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT) 210 211 /* res_findzonecut2() options */ 212 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ 213 #define RES_IPV4ONLY 0x00000002 /* IPv4 only */ 214 #define RES_IPV6ONLY 0x00000004 /* IPv6 only */ 215 216 /* 217 * Resolver options (keep these in synch with res_debug.c, please) 218 */ 219 #define RES_INIT 0x00000001 /* address initialized */ 220 #define RES_DEBUG 0x00000002 /* print debug messages */ 221 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 222 #define RES_USEVC 0x00000008 /* use virtual circuit */ 223 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 224 #define RES_IGNTC 0x00000020 /* ignore trucation errors */ 225 #define RES_RECURSE 0x00000040 /* recursion desired */ 226 #define RES_DEFNAMES 0x00000080 /* use default domain name */ 227 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 228 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ 229 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 230 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 231 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 232 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 233 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */ 234 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ 235 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ 236 #define RES_BLAST 0x00020000 /* blast all recursive servers */ 237 #define RES_NSID 0x00040000 /* request name server ID */ 238 #define RES_NOTLDQUERY 0x00100000 /* don't unqualified name as a tld */ 239 #define RES_USE_DNSSEC 0x00200000 /* use DNSSEC using OK bit in OPT */ 240 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */ 241 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 242 #define RES_USE_DNAME 0x10000000 /* use DNAME */ 243 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */ 244 #define RES_NO_NIBBLE2 0x80000000 /* disable alternate nibble lookup */ 245 246 #define RES_DEFAULT \ 247 (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH | RES_NO_NIBBLE2) 248 249 /* 250 * Resolver "pfcode" values. Used by dig. 251 */ 252 #define RES_PRF_STATS 0x00000001 253 #define RES_PRF_UPDATE 0x00000002 254 #define RES_PRF_CLASS 0x00000004 255 #define RES_PRF_CMD 0x00000008 256 #define RES_PRF_QUES 0x00000010 257 #define RES_PRF_ANS 0x00000020 258 #define RES_PRF_AUTH 0x00000040 259 #define RES_PRF_ADD 0x00000080 260 #define RES_PRF_HEAD1 0x00000100 261 #define RES_PRF_HEAD2 0x00000200 262 #define RES_PRF_TTLID 0x00000400 263 #define RES_PRF_HEADX 0x00000800 264 #define RES_PRF_QUERY 0x00001000 265 #define RES_PRF_REPLY 0x00002000 266 #define RES_PRF_INIT 0x00004000 267 #define RES_PRF_TRUNC 0x00008000 268 /* 0x00010000 */ 269 270 /* Things involving an internal (static) resolver context. */ 271 __BEGIN_DECLS 272 extern struct __res_state *__res_state(void); 273 __END_DECLS 274 #define _res (*__res_state()) 275 276 #ifndef __BIND_NOSTATIC 277 #define fp_nquery __fp_nquery 278 #define fp_query __fp_query 279 #define hostalias __hostalias 280 #define p_query __p_query 281 #define res_close __res_close 282 #define res_init __res_init 283 #define res_isourserver __res_isourserver 284 #define res_mkquery __res_mkquery 285 #define res_query __res_query 286 #define res_querydomain __res_querydomain 287 #define res_search __res_search 288 #define res_send __res_send 289 #define res_sendsigned __res_sendsigned 290 291 __BEGIN_DECLS 292 void fp_nquery(const u_char *, int, FILE *); 293 void fp_query(const u_char *, FILE *); 294 const char *hostalias(const char *); 295 void p_query(const u_char *); 296 void res_close(void); 297 int res_init(void); 298 int res_isourserver(const struct sockaddr_in *); 299 int res_mkquery(int, const char *, int, int, const u_char *, 300 int, const u_char *, u_char *, int); 301 int res_query(const char *, int, int, u_char *, int); 302 int res_querydomain(const char *, const char *, int, int, 303 u_char *, int); 304 int res_search(const char *, int, int, u_char *, int); 305 int res_send(const u_char *, int, u_char *, int); 306 int res_sendsigned(const u_char *, int, ns_tsig_key *, 307 u_char *, int); 308 __END_DECLS 309 #endif 310 311 #if !defined(SHARED_LIBBIND) || defined(LIB) 312 /* 313 * If libbind is a shared object (well, DLL anyway) 314 * these externs break the linker when resolv.h is 315 * included by a lib client (like named) 316 * Make them go away if a client is including this 317 * 318 */ 319 extern const struct res_sym __p_key_syms[]; 320 extern const struct res_sym __p_cert_syms[]; 321 extern const struct res_sym __p_class_syms[]; 322 extern const struct res_sym __p_type_syms[]; 323 extern const struct res_sym __p_rcode_syms[]; 324 #endif /* SHARED_LIBBIND */ 325 326 #define b64_ntop __b64_ntop 327 #define b64_pton __b64_pton 328 #define dn_comp __dn_comp 329 #define dn_count_labels __dn_count_labels 330 #define dn_expand __dn_expand 331 #define dn_skipname __dn_skipname 332 #define fp_resstat __fp_resstat 333 #define loc_aton __loc_aton 334 #define loc_ntoa __loc_ntoa 335 #define p_cdname __p_cdname 336 #define p_cdnname __p_cdnname 337 #define p_class __p_class 338 #define p_fqname __p_fqname 339 #define p_fqnname __p_fqnname 340 #define p_option __p_option 341 #define p_secstodate __p_secstodate 342 #define p_section __p_section 343 #define p_time __p_time 344 #define p_type __p_type 345 #define p_rcode __p_rcode 346 #define p_sockun __p_sockun 347 #define putlong __putlong 348 #define putshort __putshort 349 #define res_dnok __res_dnok 350 #define res_findzonecut __res_findzonecut 351 #define res_findzonecut2 __res_findzonecut2 352 #define res_hnok __res_hnok 353 #define res_hostalias __res_hostalias 354 #define res_mailok __res_mailok 355 #define res_nameinquery __res_nameinquery 356 #define res_nclose __res_nclose 357 #define res_ninit __res_ninit 358 #define res_nmkquery __res_nmkquery 359 #define res_pquery __res_pquery 360 #define res_nquery __res_nquery 361 #define res_nquerydomain __res_nquerydomain 362 #define res_nsearch __res_nsearch 363 #define res_nsend __res_nsend 364 #define res_nsendsigned __res_nsendsigned 365 #define res_nisourserver __res_nisourserver 366 #define res_ownok __res_ownok 367 #define res_queriesmatch __res_queriesmatch 368 #define res_rndinit __res_rndinit 369 #define res_randomid __res_randomid 370 #define res_nrandomid __res_nrandomid 371 #define sym_ntop __sym_ntop 372 #define sym_ntos __sym_ntos 373 #define sym_ston __sym_ston 374 #define res_nopt __res_nopt 375 #define res_nopt_rdata __res_nopt_rdata 376 #define res_ndestroy __res_ndestroy 377 #define res_nametoclass __res_nametoclass 378 #define res_nametotype __res_nametotype 379 #define res_setservers __res_setservers 380 #define res_getservers __res_getservers 381 #define res_buildprotolist __res_buildprotolist 382 #define res_destroyprotolist __res_destroyprotolist 383 #define res_destroyservicelist __res_destroyservicelist 384 #define res_get_nibblesuffix __res_get_nibblesuffix 385 #define res_get_nibblesuffix2 __res_get_nibblesuffix2 386 #define res_ourserver_p __res_ourserver_p 387 #define res_protocolname __res_protocolname 388 #define res_protocolnumber __res_protocolnumber 389 #define res_send_setqhook __res_send_setqhook 390 #define res_send_setrhook __res_send_setrhook 391 #define res_servicename __res_servicename 392 #define res_servicenumber __res_servicenumber 393 394 __BEGIN_DECLS 395 int res_hnok(const char *); 396 int res_ownok(const char *); 397 int res_mailok(const char *); 398 int res_dnok(const char *); 399 int sym_ston(const struct res_sym *, const char *, int *); 400 const char * sym_ntos(const struct res_sym *, int, int *); 401 const char * sym_ntop(const struct res_sym *, int, int *); 402 int b64_ntop(u_char const *, size_t, char *, size_t); 403 int b64_pton(char const *, u_char *, size_t); 404 int loc_aton(const char *, u_char *); 405 const char * loc_ntoa(const u_char *, char *); 406 int dn_skipname(const u_char *, const u_char *); 407 void putlong(u_int32_t, u_char *); 408 void putshort(u_int16_t, u_char *); 409 #if !defined(__ultrix__) && !defined(__HAIKU__) 410 u_int16_t _getshort(const u_char *); 411 u_int32_t _getlong(const u_char *); 412 #endif 413 const char * p_class(int); 414 const char * p_time(u_int32_t); 415 const char * p_type(int); 416 const char * p_rcode(int); 417 const char * p_sockun(union res_sockaddr_union, char *, size_t); 418 const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); 419 const u_char * p_cdname(const u_char *, const u_char *, FILE *); 420 const u_char * p_fqnname(const u_char *, const u_char *, int, char *, int); 421 const u_char * p_fqname(const u_char *, const u_char *, FILE *); 422 const char * p_option(u_long); 423 char * p_secstodate(u_long); 424 int dn_count_labels(const char *); 425 int dn_comp(const char *, u_char *, int, u_char **, u_char **); 426 int dn_expand(const u_char *, const u_char *, const u_char *, 427 char *, int); 428 void res_rndinit(res_state); 429 u_int res_randomid(void); 430 u_int res_nrandomid(res_state); 431 int res_nameinquery(const char *, int, int, const u_char *, 432 const u_char *); 433 int res_queriesmatch(const u_char *, const u_char *, const u_char *, 434 const u_char *); 435 const char * p_section(int, int); 436 /* Things involving a resolver context. */ 437 int res_ninit(res_state); 438 int res_nisourserver(const res_state, const struct sockaddr_in *); 439 void fp_resstat(const res_state, FILE *); 440 void res_pquery(const res_state, const u_char *, int, FILE *); 441 const char * res_hostalias(const res_state, const char *, char *, size_t); 442 int res_nquery(res_state, const char *, int, int, u_char *, int); 443 int res_nsearch(res_state, const char *, int, int, u_char *, int); 444 int res_nquerydomain(res_state, const char *, const char *, int, 445 int, u_char *, int); 446 int res_nmkquery(res_state, int, const char *, int, int, 447 const u_char *, int, const u_char *, u_char *, int); 448 int res_nsend(res_state, const u_char *, int, u_char *, int); 449 int res_nsendsigned(res_state, const u_char *, int, ns_tsig_key *, 450 u_char *, int); 451 int res_findzonecut(res_state, const char *, ns_class, int, char *, 452 size_t, struct in_addr *, int); 453 int res_findzonecut2(res_state, const char *, ns_class, int, char *, 454 size_t, union res_sockaddr_union *, int); 455 void res_nclose(res_state); 456 int res_nopt(res_state, int, u_char *, int, int); 457 int res_nopt_rdata(res_state, int, u_char *, int, u_char *, u_short, 458 u_short, u_char *); 459 void res_send_setqhook(res_send_qhook); 460 void res_send_setrhook(res_send_rhook); 461 int __res_vinit(res_state, int); 462 void res_destroyservicelist(void); 463 const char * res_servicename(u_int16_t, const char *); 464 const char * res_protocolname(int); 465 void res_destroyprotolist(void); 466 void res_buildprotolist(void); 467 const char * res_get_nibblesuffix(res_state); 468 const char * res_get_nibblesuffix2(res_state); 469 void res_ndestroy(res_state); 470 u_int16_t res_nametoclass(const char *, int *); 471 u_int16_t res_nametotype(const char *, int *); 472 void res_setservers(res_state, const union res_sockaddr_union *, 473 int); 474 int res_getservers(res_state, union res_sockaddr_union *, int); 475 __END_DECLS 476 477 #endif /* !_RESOLV_H_ */ 478