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)) 96struct __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 112typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 113 res_sendhookact; 114 115typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *, 116 const u_char **, int *, 117 u_char *, int, int *); 118 119typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *, 120 const u_char *, int, u_char *, 121 int, int *); 122 123struct 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 145struct __res_state_ext; 146 147struct __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 199typedef struct __res_state *res_state; 200 201union 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 */ 294extern 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 321void fp_nquery(const u_char *, int, FILE *); 322void fp_query(const u_char *, FILE *); 323const char * hostalias(const char *); 324void p_query(const u_char *); 325void res_close(void); 326int res_init(void); 327__LIBC_HIDDEN__ int res_opt(int, u_char *, int, int); 328int res_isourserver(const struct sockaddr_in *); 329int res_mkquery(int, const char *, int, int, const u_char *, int, const u_char *, u_char *, int); 330int res_query(const char *, int, int, u_char *, int); 331int res_querydomain(const char *, const char *, int, int, u_char *, int); 332int res_search(const char *, int, int, u_char *, int); 333int res_send(const u_char *, int, u_char *, int); 334int 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[]; 348extern const struct res_sym __p_class_syms[]; 349extern 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 417int res_hnok(const char *); 418int res_ownok(const char *); 419int res_mailok(const char *); 420int res_dnok(const char *); 421int sym_ston(const struct res_sym *, const char *, int *); 422const char * sym_ntos(const struct res_sym *, int, int *); 423const char * sym_ntop(const struct res_sym *, int, int *); 424#ifndef ANDROID_CHANGES 425int b64_ntop(u_char const *, size_t, char *, size_t); 426int b64_pton(char const *, u_char *, size_t); 427#endif 428int loc_aton(const char *, u_char *); 429const char * loc_ntoa(const u_char *, char *); 430int dn_skipname(const u_char *, const u_char *); 431void putlong(uint32_t, u_char *); 432void putshort(uint16_t, u_char *); 433#ifndef __ultrix__ 434uint16_t _getshort(const u_char *); 435uint32_t _getlong(const u_char *); 436#endif 437const char * p_class(int); 438const char * p_time(uint32_t); 439const char * p_type(int); 440const char * p_rcode(int); 441__LIBC_HIDDEN__ const char * p_sockun(union res_sockaddr_union, char *, size_t); 442const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); 443const u_char * p_cdname(const u_char *, const u_char *, FILE *); 444const u_char * p_fqnname(const u_char *, const u_char *, 445 int, char *, int); 446const u_char * p_fqname(const u_char *, const u_char *, FILE *); 447const char * p_option(u_long); 448char * p_secstodate(u_long); 449int dn_count_labels(const char *); 450u_int res_randomid(void); 451int res_nameinquery(const char *, int, int, const u_char *, 452 const u_char *); 453int 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. */ 457int res_ninit(res_state); 458int res_nisourserver(const res_state, const struct sockaddr_in *); 459void fp_resstat(const res_state, FILE *); 460__LIBC_HIDDEN__ void res_pquery(const res_state, const u_char *, int, FILE *); 461const char * res_hostalias(const res_state, const char *, char *, size_t); 462int res_nquery(res_state, const char *, int, int, u_char *, int); 463int res_nsearch(res_state, const char *, int, int, u_char *, int); 464int res_nquerydomain(res_state, const char *, const char *, 465 int, int, u_char *, int); 466int res_nmkquery(res_state, int, const char *, int, int, 467 const u_char *, int, const u_char *, 468 u_char *, int); 469int res_nsend(res_state, const u_char *, int, u_char *, int); 470int res_nsendsigned(res_state, const u_char *, int, 471 ns_tsig_key *, u_char *, int); 472int res_findzonecut(res_state, const char *, ns_class, int, 473 char *, size_t, struct in_addr *, int); 474int res_findzonecut2(res_state, const char *, ns_class, int, 475 char *, size_t, 476 union res_sockaddr_union *, int); 477void res_nclose(res_state); 478__LIBC_HIDDEN__ int res_nopt(res_state, int, u_char *, int, int); 479void res_send_setqhook(res_send_qhook); 480void res_send_setrhook(res_send_rhook); 481__LIBC_HIDDEN__ int __res_vinit(res_state, int); 482void res_destroyservicelist(void); 483const char * res_servicename(uint16_t, const char *); 484const char * res_protocolname(int); 485void res_destroyprotolist(void); 486void 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); 499u_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