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 2 /* Default #/tries. */ 102# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ 103 104struct __res_state { 105 int retrans; /* retransmition time interval */ 106 int retry; /* number of times to retransmit */ 107 u_long options; /* option flags - see below. */ 108 int nscount; /* number of name servers */ 109 struct sockaddr_in 110 nsaddr_list[MAXNS]; /* address of name server */ 111# define nsaddr nsaddr_list[0] /* for backward compatibility */ 112 u_short id; /* current message id */ 113 /* 2 byte hole here. */ 114 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 115 char defdname[256]; /* default domain (deprecated) */ 116 u_long pfcode; /* RES_PRF_ flags - see below. */ 117 unsigned ndots:4; /* threshold for initial abs. query */ 118 unsigned nsort:4; /* number of elements in sort_list[] */ 119 unsigned ipv6_unavail:1; /* connecting to IPv6 server failed */ 120 unsigned unused:23; 121 struct { 122 struct in_addr addr; 123 u_int32_t mask; 124 } sort_list[MAXRESOLVSORT]; 125 /* 4 byte hole here on 64-bit architectures. */ 126 res_send_qhook qhook; /* query hook */ 127 res_send_rhook rhook; /* response hook */ 128 int res_h_errno; /* last one set for this context */ 129 int _vcsock; /* PRIVATE: for res_send VC i/o */ 130 u_int _flags; /* PRIVATE: see below */ 131 /* 4 byte hole here on 64-bit architectures. */ 132 union { 133 char pad[52]; /* On an i386 this means 512b total. */ 134 struct { 135 u_int16_t nscount; 136 u_int16_t nsmap[MAXNS]; 137 int nssocks[MAXNS]; 138 u_int16_t nscount6; 139 u_int16_t nsinit; 140 struct sockaddr_in6 *nsaddrs[MAXNS]; 141#ifdef _LIBC 142 unsigned long long int initstamp 143 __attribute__((packed)); 144#else 145 unsigned int _initstamp[2]; 146#endif 147 } _ext; 148 } _u; 149}; 150 151typedef struct __res_state *res_state; 152# undef __need_res_state 153#endif 154 155#ifdef _RESOLV_H_ 156/* 157 * Revision information. This is the release date in YYYYMMDD format. 158 * It can change every day so the right thing to do with it is use it 159 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 160 * compare for equality; rather, use it to determine whether your resolver 161 * is new enough to contain a certain feature. 162 */ 163 164#define __RES 19991006 165 166/* 167 * Resolver configuration file. 168 * Normally not present, but may contain the address of the 169 * inital name server(s) to query and the domain search list. 170 */ 171 172#ifndef _PATH_RESCONF 173#define _PATH_RESCONF "/etc/resolv.conf" 174#endif 175 176struct res_sym { 177 int number; /* Identifying number, like T_MX */ 178 char * name; /* Its symbolic name, like "MX" */ 179 char * humanname; /* Its fun name, like "mail exchanger" */ 180}; 181 182/* 183 * Resolver flags (used to be discrete per-module statics ints). 184 */ 185#define RES_F_VC 0x00000001 /* socket is TCP */ 186#define RES_F_CONN 0x00000002 /* socket is connected */ 187#define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */ 188 189/* res_findzonecut() options */ 190#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ 191 192/* 193 * Resolver options (keep these in synch with res_debug.c, please) 194 */ 195#define RES_INIT 0x00000001 /* address initialized */ 196#define RES_DEBUG 0x00000002 /* print debug messages */ 197#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 198#define RES_USEVC 0x00000008 /* use virtual circuit */ 199#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 200#define RES_IGNTC 0x00000020 /* ignore trucation errors */ 201#define RES_RECURSE 0x00000040 /* recursion desired */ 202#define RES_DEFNAMES 0x00000080 /* use default domain name */ 203#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 204#define RES_DNSRCH 0x00000200 /* search up local domain tree */ 205#define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 206#define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 207#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 208#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 209#define RES_ROTATE 0x00004000 /* rotate ns list after each query */ 210#define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ 211#define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ 212#define RES_BLAST 0x00020000 /* blast all recursive servers */ 213#define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte 214 strings */ 215#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6 216 reverse lookup */ 217#define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */ 218#define RES_SNGLKUP 0x00200000 /* one outstanding request at a time */ 219#define RES_SNGLKUPREOP 0x00400000 /* -"-, but open new socket for each 220 request */ 221#define RES_USE_DNSSEC 0x00800000 /* use DNSSEC using OK bit in OPT */ 222 223#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT) 224 225/* 226 * Resolver "pfcode" values. Used by dig. 227 */ 228#define RES_PRF_STATS 0x00000001 229#define RES_PRF_UPDATE 0x00000002 230#define RES_PRF_CLASS 0x00000004 231#define RES_PRF_CMD 0x00000008 232#define RES_PRF_QUES 0x00000010 233#define RES_PRF_ANS 0x00000020 234#define RES_PRF_AUTH 0x00000040 235#define RES_PRF_ADD 0x00000080 236#define RES_PRF_HEAD1 0x00000100 237#define RES_PRF_HEAD2 0x00000200 238#define RES_PRF_TTLID 0x00000400 239#define RES_PRF_HEADX 0x00000800 240#define RES_PRF_QUERY 0x00001000 241#define RES_PRF_REPLY 0x00002000 242#define RES_PRF_INIT 0x00004000 243/* 0x00008000 */ 244 245/* Things involving an internal (static) resolver context. */ 246__BEGIN_DECLS 247extern struct __res_state *__res_state(void) __attribute__ ((__const__)); 248__END_DECLS 249#define _res (*__res_state()) 250 251#ifndef __BIND_NOSTATIC 252#define fp_nquery __fp_nquery 253#define fp_query __fp_query 254#define hostalias __hostalias 255#define p_query __p_query 256#define res_close __res_close 257#define res_init __res_init 258#define res_isourserver __res_isourserver 259#define res_mkquery __res_mkquery 260#define res_query __res_query 261#define res_querydomain __res_querydomain 262#define res_search __res_search 263#define res_send __res_send 264 265__BEGIN_DECLS 266void fp_nquery (const u_char *, int, FILE *) __THROW; 267void fp_query (const u_char *, FILE *) __THROW; 268const char * hostalias (const char *) __THROW; 269void p_query (const u_char *) __THROW; 270void res_close (void) __THROW; 271int res_init (void) __THROW; 272int res_isourserver (const struct sockaddr_in *) __THROW; 273int res_mkquery (int, const char *, int, int, const u_char *, 274 int, const u_char *, u_char *, int) __THROW; 275int res_query (const char *, int, int, u_char *, int) __THROW; 276int res_querydomain (const char *, const char *, int, int, 277 u_char *, int) __THROW; 278int res_search (const char *, int, int, u_char *, int) __THROW; 279int res_send (const u_char *, int, u_char *, int) __THROW; 280__END_DECLS 281#endif 282 283#define b64_ntop __b64_ntop 284#define b64_pton __b64_pton 285#define dn_comp __dn_comp 286#define dn_count_labels __dn_count_labels 287#define dn_expand __dn_expand 288#define dn_skipname __dn_skipname 289#define fp_resstat __fp_resstat 290#define loc_aton __loc_aton 291#define loc_ntoa __loc_ntoa 292#define p_cdname __p_cdname 293#define p_cdnname __p_cdnname 294#define p_class __p_class 295#define p_fqname __p_fqname 296#define p_fqnname __p_fqnname 297#define p_option __p_option 298#define p_secstodate __p_secstodate 299#define p_section __p_section 300#define p_time __p_time 301#define p_type __p_type 302#define p_rcode __p_rcode 303#define putlong __putlong 304#define putshort __putshort 305#define res_dnok __res_dnok 306#define res_hnok __res_hnok 307#define res_hostalias __res_hostalias 308#define res_mailok __res_mailok 309#define res_nameinquery __res_nameinquery 310#define res_nclose __res_nclose 311#define res_ninit __res_ninit 312#define res_nmkquery __res_nmkquery 313#define res_npquery __res_npquery 314#define res_nquery __res_nquery 315#define res_nquerydomain __res_nquerydomain 316#define res_nsearch __res_nsearch 317#define res_nsend __res_nsend 318#define res_nisourserver __res_nisourserver 319#define res_ownok __res_ownok 320#define res_queriesmatch __res_queriesmatch 321#define res_randomid __res_randomid 322#define sym_ntop __sym_ntop 323#define sym_ntos __sym_ntos 324#define sym_ston __sym_ston 325__BEGIN_DECLS 326int res_hnok (const char *) __THROW; 327int res_ownok (const char *) __THROW; 328int res_mailok (const char *) __THROW; 329int res_dnok (const char *) __THROW; 330int sym_ston (const struct res_sym *, const char *, int *) __THROW; 331const char * sym_ntos (const struct res_sym *, int, int *) __THROW; 332const char * sym_ntop (const struct res_sym *, int, int *) __THROW; 333int b64_ntop (u_char const *, size_t, char *, size_t) __THROW; 334int b64_pton (char const *, u_char *, size_t) __THROW; 335int loc_aton (const char *__ascii, u_char *__binary) __THROW; 336const char * loc_ntoa (const u_char *__binary, char *__ascii) __THROW; 337int dn_skipname (const u_char *, const u_char *) __THROW; 338void putlong (u_int32_t, u_char *) __THROW; 339void putshort (u_int16_t, u_char *) __THROW; 340const char * p_class (int) __THROW; 341const char * p_time (u_int32_t) __THROW; 342const char * p_type (int) __THROW; 343const char * p_rcode (int) __THROW; 344const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *) 345 __THROW; 346const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW; 347const u_char * p_fqnname (const u_char *__cp, const u_char *__msg, 348 int, char *, int) __THROW; 349const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW; 350const char * p_option (u_long __option) __THROW; 351char * p_secstodate (u_long) __THROW; 352int dn_count_labels (const char *) __THROW; 353int dn_comp (const char *, u_char *, int, u_char **, u_char **) 354 __THROW; 355int dn_expand (const u_char *, const u_char *, const u_char *, 356 char *, int) __THROW; 357u_int res_randomid (void) __THROW; 358int res_nameinquery (const char *, int, int, 359 const u_char *, const u_char *) __THROW; 360int res_queriesmatch (const u_char *, const u_char *, 361 const u_char *, const u_char *) __THROW; 362const char * p_section (int __section, int __opcode) __THROW; 363/* Things involving a resolver context. */ 364int res_ninit (res_state) __THROW; 365int res_nisourserver (const res_state, 366 const struct sockaddr_in *) __THROW; 367void fp_resstat (const res_state, FILE *) __THROW; 368void res_npquery (const res_state, const u_char *, int, FILE *) 369 __THROW; 370const char * res_hostalias (const res_state, const char *, char *, size_t) 371 __THROW; 372int res_nquery (res_state, const char *, int, int, u_char *, int) 373 __THROW; 374int res_nsearch (res_state, const char *, int, int, u_char *, int) 375 __THROW; 376int res_nquerydomain (res_state, const char *, const char *, int, 377 int, u_char *, int) __THROW; 378int res_nmkquery (res_state, int, const char *, int, int, 379 const u_char *, int, const u_char *, u_char *, 380 int) __THROW; 381int res_nsend (res_state, const u_char *, int, u_char *, int) 382 __THROW; 383void res_nclose (res_state) __THROW; 384__END_DECLS 385#endif 386 387#endif /* !_RESOLV_H_ */ 388