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/* 31 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies. 36 * 37 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 38 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 40 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 41 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 42 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 43 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 44 * SOFTWARE. 45 */ 46 47/* 48 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 49 * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $ 50 */ 51 52#ifndef _RESOLV_H_ 53 54/* These headers are needed for types used in the `struct res_state' 55 declaration. */ 56#include <sys/types.h> 57#include <netinet/in.h> 58 59#ifndef __need_res_state 60# define _RESOLV_H_ 61 62# include <sys/param.h> 63# include <sys/cdefs.h> 64# include <stdio.h> 65# include <arpa/nameser.h> 66#endif 67 68#ifndef __res_state_defined 69# define __res_state_defined 70 71typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 72 res_sendhookact; 73 74typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns, 75 const u_char **query, 76 int *querylen, 77 u_char *ans, 78 int anssiz, 79 int *resplen); 80 81typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns, 82 const u_char *query, 83 int querylen, 84 u_char *ans, 85 int anssiz, 86 int *resplen); 87 88/* 89 * Global defines and variables for resolver stub. 90 */ 91# define MAXNS 3 /* max # name servers we'll track */ 92# define MAXDFLSRCH 3 /* # default domain levels to try */ 93# define MAXDNSRCH 6 /* max # domains in search path */ 94# define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 95 96# define RES_TIMEOUT 5 /* min. seconds between retries */ 97# define MAXRESOLVSORT 10 /* number of net to sort on */ 98# define RES_MAXNDOTS 15 /* should reflect bit field size */ 99# define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ 100# define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ 101# define RES_DFLRETRY 3 /* Default #/tries. */ 102/* (glibc uses RES_DFLRETRY of 2 but also does _res.retry = 4 sometimes (!) */ 103# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ 104 105/* _res (an instance of this structure) uses 0.5kb in bss 106 * in "ordinary" libc's (glibc, xBSD). We want to be less wasteful. 107 * We (1) shuffle and shrink some integer fields, 108 * and (2) can switch off stuff we don't support. 109 * Everything inside __UCLIBC_HAS_COMPAT_RES_STATE__ 110 * is not actually used by uclibc and can be configured off. 111 * However, this will prevent some programs from building. 112 * Really obscure stuff with no observed users in the wild is under 113 * __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__. 114 * I guess it's safe to set that to N. 115 */ 116struct __res_state { 117 /*int retrans, retry; - moved, was here */ 118 u_int32_t options; /* (was: ulong) option flags - see below. */ 119 struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */ 120#define nsaddr nsaddr_list[0] /* for backward compatibility */ 121 char *dnsrch[MAXDNSRCH + 1]; /* components of domain to search */ 122 /*char defdname[256]; - moved, was here */ 123 u_int8_t nscount; /* (was: int) number of name servers */ 124 u_int8_t ndots; /* (was: unsigned:4) threshold for initial abs. query */ 125 u_int8_t retrans; /* (was: int) retransmission time interval */ 126 u_int8_t retry; /* (was: int) number of times to retransmit */ 127#ifdef __UCLIBC_HAS_COMPAT_RES_STATE__ 128 /* googling for "_res.defdname" says it's still sometimes used. 129 * Pity. It's huge, I want to move it to EXTRA_COMPAT... */ 130 char defdname[256]; /* default domain (deprecated) */ 131 u_int8_t nsort; /* (was: unsigned:4) number of elements in sort_list[] */ 132 u_int16_t pfcode; /* (was: ulong) RES_PRF_ flags. Used by dig. */ 133 unsigned short id; /* current message id */ 134 int res_h_errno; /* last one set for this context */ 135 struct { 136 struct in_addr addr; 137 u_int32_t mask; 138 } sort_list[MAXRESOLVSORT]; 139#endif 140 141#ifdef __UCLIBC_HAS_IPV6__ 142 /* I assume that the intention is to store all 143 * DNS servers' addresses here, and duplicate in nsaddr_list[] 144 * those which have IPv4 address. In the case of IPv4 address 145 * _u._ext.nsaddrs[x] will point to some nsaddr_list[y], 146 * otherwise it will point into malloc'ed sockaddr_in6. 147 * nscount is the number of IPv4 addresses and _u._ext.nscount 148 * is the number of addresses of all kinds. 149 * 150 * If this differs from established usage and you need 151 * to change this, please describe how it is supposed to work. 152 */ 153 union { 154 struct { 155 struct sockaddr_in6 *nsaddrs[MAXNS]; 156 u_int8_t nscount; /* (was: u_int16_t) */ 157#ifdef __UCLIBC_HAS_COMPAT_RES_STATE__ 158 /* rather obscure, and differs in BSD and glibc */ 159 u_int16_t nstimes[MAXNS]; 160 int nssocks[MAXNS]; 161 u_int16_t nscount6; 162 u_int16_t nsinit; 163 /* glibc also has: */ 164 /*u_int16_t nsmap[MAXNS];*/ 165 /*unsigned long long initstamp;*/ 166#endif 167 } _ext; 168 } _u; 169#endif 170 171#ifdef __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__ 172 /* Truly obscure stuff. 173 * Googling for "_res.XXX" for these members 174 * turned up basically empty */ 175 res_send_qhook qhook; /* query hook */ 176 res_send_rhook rhook; /* response hook */ 177 int _vcsock; /* PRIVATE: for res_send VC i/o */ 178 unsigned _flags; /* PRIVATE: see below */ 179#endif 180}; 181 182typedef struct __res_state *res_state; 183# undef __need_res_state 184#endif 185 186#ifdef _RESOLV_H_ 187/* 188 * Revision information. This is the release date in YYYYMMDD format. 189 * It can change every day so the right thing to do with it is use it 190 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 191 * compare for equality; rather, use it to determine whether your resolver 192 * is new enough to contain a certain feature. 193 */ 194 195#if 0 196#define __RES 19991006 197#else 198#define __RES 19960801 199#endif 200 201/* 202 * Resolver configuration file. 203 * Normally not present, but may contain the address of the 204 * inital name server(s) to query and the domain search list. 205 */ 206 207#ifndef _PATH_RESCONF 208#define _PATH_RESCONF "/etc/resolv.conf" 209#endif 210 211struct res_sym { 212 int number; /* Identifying number, like T_MX */ 213 char * name; /* Its symbolic name, like "MX" */ 214 char * humanname; /* Its fun name, like "mail exchanger" */ 215}; 216 217/* 218 * Resolver flags (used to be discrete per-module statics ints). 219 */ 220#define RES_F_VC 0x00000001 /* socket is TCP */ 221#define RES_F_CONN 0x00000002 /* socket is connected */ 222 223/* res_findzonecut() options */ 224#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ 225 226/* 227 * Resolver options (keep these in synch with res_debug.c, please) 228 * (which of these do we really implement??) 229 */ 230#define RES_INIT 0x00000001 /* address initialized */ 231#define RES_DEBUG 0x00000002 /* print debug messages */ 232#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 233#define RES_USEVC 0x00000008 /* use virtual circuit */ 234#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 235#define RES_IGNTC 0x00000020 /* ignore trucation errors */ 236#define RES_RECURSE 0x00000040 /* recursion desired */ 237#define RES_DEFNAMES 0x00000080 /* use default domain name */ 238#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 239#define RES_DNSRCH 0x00000200 /* search up local domain tree */ 240#define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 241#define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 242#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 243#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 244#define RES_ROTATE 0x00004000 /* rotate ns list after each query */ 245#define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ 246#define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ 247#define RES_BLAST 0x00020000 /* blast all recursive servers */ 248#if 0 249#define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte 250 strings */ 251#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6 252 reverse lookup */ 253 254#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT) 255#else 256#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH) 257#endif 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/* 0x00008000 */ 278 279/* Things involving an internal (static) resolver context. */ 280__BEGIN_DECLS 281extern struct __res_state *__res_state(void) __attribute__ ((__const__)); 282__END_DECLS 283#define _res (*__res_state()) 284 285#if 0 286#define fp_nquery __fp_nquery 287#define fp_query __fp_query 288#define hostalias __hostalias 289#define p_query __p_query 290#endif 291#define res_close __res_close 292#define res_init __res_init 293#if 0 294#define res_isourserver __res_isourserver 295#define res_mkquery __res_mkquery 296#endif 297#define res_query __res_query 298#define res_querydomain __res_querydomain 299#define res_search __res_search 300#if 0 301#define res_send __res_send 302#endif 303 304__BEGIN_DECLS 305#if 0 306void fp_nquery (const u_char *, int, FILE *) __THROW; 307void fp_query (const u_char *, FILE *) __THROW; 308const char * hostalias (const char *) __THROW; 309void p_query (const u_char *) __THROW; 310#endif 311#ifdef __UCLIBC_HAS_BSD_RES_CLOSE__ 312void res_close (void) __THROW; 313#endif 314int res_init (void) __THROW; 315#if 0 316int res_isourserver (const struct sockaddr_in *) __THROW; 317int res_mkquery (int, const char *, int, int, const u_char *, 318 int, const u_char *, u_char *, int) __THROW; 319#endif 320int res_query (const char *, int, int, u_char *, int) __THROW; 321int res_querydomain (const char *, const char *, int, int, 322 u_char *, int) __THROW; 323int res_search (const char *, int, int, u_char *, int) __THROW; 324#if 0 325int res_send (const u_char *, int, u_char *, int) __THROW; 326#endif 327__END_DECLS 328 329#if 0 330#define b64_ntop __b64_ntop 331#define b64_pton __b64_pton 332#endif 333#define dn_comp __dn_comp 334#if 0 335#define dn_count_labels __dn_count_labels 336#endif 337#define dn_expand __dn_expand 338#if 0 339#define dn_skipname __dn_skipname 340#define fp_resstat __fp_resstat 341#define loc_aton __loc_aton 342#define loc_ntoa __loc_ntoa 343#define p_cdname __p_cdname 344#define p_cdnname __p_cdnname 345#define p_class __p_class 346#define p_fqname __p_fqname 347#define p_fqnname __p_fqnname 348#define p_option __p_option 349#define p_secstodate __p_secstodate 350#define p_section __p_section 351#define p_time __p_time 352#define p_type __p_type 353#define p_rcode __p_rcode 354#define putlong __putlong 355#define putshort __putshort 356#define res_dnok __res_dnok 357#define res_hnok __res_hnok 358#define res_hostalias __res_hostalias 359#define res_mailok __res_mailok 360#define res_nameinquery __res_nameinquery 361#define res_nclose __res_nclose 362#define res_ninit __res_ninit 363#define res_nmkquery __res_nmkquery 364#define res_npquery __res_npquery 365#define res_nquery __res_nquery 366#define res_nquerydomain __res_nquerydomain 367#define res_nsearch __res_nsearch 368#define res_nsend __res_nsend 369#define res_nisourserver __res_nisourserver 370#define res_ownok __res_ownok 371#define res_queriesmatch __res_queriesmatch 372#define res_randomid __res_randomid 373#define sym_ntop __sym_ntop 374#define sym_ntos __sym_ntos 375#define sym_ston __sym_ston 376#endif 377__BEGIN_DECLS 378#if 0 379int res_hnok (const char *) __THROW; 380int res_ownok (const char *) __THROW; 381int res_mailok (const char *) __THROW; 382int res_dnok (const char *) __THROW; 383int sym_ston (const struct res_sym *, const char *, int *) __THROW; 384const char * sym_ntos (const struct res_sym *, int, int *) __THROW; 385const char * sym_ntop (const struct res_sym *, int, int *) __THROW; 386int b64_ntop (u_char const *, size_t, char *, size_t) __THROW; 387int b64_pton (char const *, u_char *, size_t) __THROW; 388int loc_aton (const char *ascii, u_char *binary) __THROW; 389const char * loc_ntoa (const u_char *binary, char *ascii) __THROW; 390int dn_skipname (const u_char *, const u_char *) __THROW; 391void putlong (u_int32_t, u_char *) __THROW; 392void putshort (u_int16_t, u_char *) __THROW; 393const char * p_class (int) __THROW; 394const char * p_time (u_int32_t) __THROW; 395const char * p_type (int) __THROW; 396const char * p_rcode (int) __THROW; 397const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *) 398 __THROW; 399const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW; 400const u_char * p_fqnname (const u_char *cp, const u_char *msg, 401 int, char *, int) __THROW; 402const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW; 403const char * p_option (u_long option) __THROW; 404char * p_secstodate (u_long) __THROW; 405int dn_count_labels (const char *) __THROW; 406#endif 407int dn_comp (const char *, u_char *, int, u_char **, u_char **) 408 __THROW; 409 410int dn_expand (const u_char *, const u_char *, const u_char *, 411 char *, int) __THROW; 412#if 0 413u_int res_randomid (void) __THROW; 414int res_nameinquery (const char *, int, int, 415 const u_char *, const u_char *) __THROW; 416int res_queriesmatch (const u_char *, const u_char *, 417 const u_char *, const u_char *) __THROW; 418const char * p_section (int section, int opcode) __THROW; 419/* Things involving a resolver context. */ 420int res_ninit (res_state) __THROW; 421int res_nisourserver (const res_state, 422 const struct sockaddr_in *) __THROW; 423void fp_resstat (const res_state, FILE *) __THROW; 424void res_npquery (const res_state, const u_char *, int, FILE *) 425 __THROW; 426const char * res_hostalias (const res_state, const char *, char *, size_t) 427 __THROW; 428int res_nquery (res_state, const char *, int, int, u_char *, int) 429 __THROW; 430int res_nsearch (res_state, const char *, int, int, u_char *, int) 431 __THROW; 432int res_nquerydomain (res_state, const char *, const char *, int, 433 int, u_char *, int) __THROW; 434int res_nmkquery (res_state, int, const char *, int, int, 435 const u_char *, int, const u_char *, u_char *, 436 int) __THROW; 437int res_nsend (res_state, const u_char *, int, u_char *, int) 438 __THROW; 439void res_nclose (res_state) __THROW; 440#endif 441__END_DECLS 442 443 444#endif /* _RESOLV_H_ */ 445 446#endif /* !_RESOLV_H_ */ 447