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 71 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 72 res_sendhookact; 73 74 typedef 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 81 typedef 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. */ 103 104 struct __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 }; 150 151 typedef 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 175 176 struct 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 #define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name 223 as a TLD. */ 224 225 #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT) 226 227 /* 228 * Resolver "pfcode" values. Used by dig. 229 */ 230 #define RES_PRF_STATS 0x00000001 231 #define RES_PRF_UPDATE 0x00000002 232 #define RES_PRF_CLASS 0x00000004 233 #define RES_PRF_CMD 0x00000008 234 #define RES_PRF_QUES 0x00000010 235 #define RES_PRF_ANS 0x00000020 236 #define RES_PRF_AUTH 0x00000040 237 #define RES_PRF_ADD 0x00000080 238 #define RES_PRF_HEAD1 0x00000100 239 #define RES_PRF_HEAD2 0x00000200 240 #define RES_PRF_TTLID 0x00000400 241 #define RES_PRF_HEADX 0x00000800 242 #define RES_PRF_QUERY 0x00001000 243 #define RES_PRF_REPLY 0x00002000 244 #define RES_PRF_INIT 0x00004000 245 /* 0x00008000 */ 246 247 /* Things involving an internal (static) resolver context. */ 248 __BEGIN_DECLS 249 extern struct __res_state *__res_state(void) __attribute__ ((__const__)); 250 __END_DECLS 251 #define _res (*__res_state()) 252 253 #ifndef __BIND_NOSTATIC 254 #define fp_nquery __fp_nquery 255 #define fp_query __fp_query 256 #define hostalias __hostalias 257 #define p_query __p_query 258 #define res_close __res_close 259 #define res_init __res_init 260 #define res_isourserver __res_isourserver 261 #define res_mkquery __res_mkquery 262 #define res_query __res_query 263 #define res_querydomain __res_querydomain 264 #define res_search __res_search 265 #define res_send __res_send 266 267 __BEGIN_DECLS 268 void fp_nquery (const u_char *, int, FILE *) __THROW; 269 void fp_query (const u_char *, FILE *) __THROW; 270 const char * hostalias (const char *) __THROW; 271 void p_query (const u_char *) __THROW; 272 void res_close (void) __THROW; 273 int res_init (void) __THROW; 274 int res_isourserver (const struct sockaddr_in *) __THROW; 275 int res_mkquery (int, const char *, int, int, const u_char *, 276 int, const u_char *, u_char *, int) __THROW; 277 int res_query (const char *, int, int, u_char *, int) __THROW; 278 int res_querydomain (const char *, const char *, int, int, 279 u_char *, int) __THROW; 280 int res_search (const char *, int, int, u_char *, int) __THROW; 281 int res_send (const u_char *, int, u_char *, int) __THROW; 282 __END_DECLS 283 #endif 284 285 #define b64_ntop __b64_ntop 286 #define b64_pton __b64_pton 287 #define dn_comp __dn_comp 288 #define dn_count_labels __dn_count_labels 289 #define dn_expand __dn_expand 290 #define dn_skipname __dn_skipname 291 #define fp_resstat __fp_resstat 292 #define loc_aton __loc_aton 293 #define loc_ntoa __loc_ntoa 294 #define p_cdname __p_cdname 295 #define p_cdnname __p_cdnname 296 #define p_class __p_class 297 #define p_fqname __p_fqname 298 #define p_fqnname __p_fqnname 299 #define p_option __p_option 300 #define p_secstodate __p_secstodate 301 #define p_section __p_section 302 #define p_time __p_time 303 #define p_type __p_type 304 #define p_rcode __p_rcode 305 #define putlong __putlong 306 #define putshort __putshort 307 #define res_dnok __res_dnok 308 #define res_hnok __res_hnok 309 #define res_hostalias __res_hostalias 310 #define res_mailok __res_mailok 311 #define res_nameinquery __res_nameinquery 312 #define res_nclose __res_nclose 313 #define res_ninit __res_ninit 314 #define res_nmkquery __res_nmkquery 315 #define res_npquery __res_npquery 316 #define res_nquery __res_nquery 317 #define res_nquerydomain __res_nquerydomain 318 #define res_nsearch __res_nsearch 319 #define res_nsend __res_nsend 320 #define res_nisourserver __res_nisourserver 321 #define res_ownok __res_ownok 322 #define res_queriesmatch __res_queriesmatch 323 #define res_randomid __res_randomid 324 #define sym_ntop __sym_ntop 325 #define sym_ntos __sym_ntos 326 #define sym_ston __sym_ston 327 __BEGIN_DECLS 328 int res_hnok (const char *) __THROW; 329 int res_ownok (const char *) __THROW; 330 int res_mailok (const char *) __THROW; 331 int res_dnok (const char *) __THROW; 332 int sym_ston (const struct res_sym *, const char *, int *) __THROW; 333 const char * sym_ntos (const struct res_sym *, int, int *) __THROW; 334 const char * sym_ntop (const struct res_sym *, int, int *) __THROW; 335 int b64_ntop (u_char const *, size_t, char *, size_t) __THROW; 336 int b64_pton (char const *, u_char *, size_t) __THROW; 337 int loc_aton (const char *__ascii, u_char *__binary) __THROW; 338 const char * loc_ntoa (const u_char *__binary, char *__ascii) __THROW; 339 int dn_skipname (const u_char *, const u_char *) __THROW; 340 void putlong (u_int32_t, u_char *) __THROW; 341 void putshort (u_int16_t, u_char *) __THROW; 342 const char * p_class (int) __THROW; 343 const char * p_time (u_int32_t) __THROW; 344 const char * p_type (int) __THROW; 345 const char * p_rcode (int) __THROW; 346 const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *) 347 __THROW; 348 const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW; 349 const u_char * p_fqnname (const u_char *__cp, const u_char *__msg, 350 int, char *, int) __THROW; 351 const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW; 352 const char * p_option (u_long __option) __THROW; 353 char * p_secstodate (u_long) __THROW; 354 int dn_count_labels (const char *) __THROW; 355 int dn_comp (const char *, u_char *, int, u_char **, u_char **) 356 __THROW; 357 int dn_expand (const u_char *, const u_char *, const u_char *, 358 char *, int) __THROW; 359 u_int res_randomid (void) __THROW; 360 int res_nameinquery (const char *, int, int, 361 const u_char *, const u_char *) __THROW; 362 int res_queriesmatch (const u_char *, const u_char *, 363 const u_char *, const u_char *) __THROW; 364 const char * p_section (int __section, int __opcode) __THROW; 365 /* Things involving a resolver context. */ 366 int res_ninit (res_state) __THROW; 367 int res_nisourserver (const res_state, 368 const struct sockaddr_in *) __THROW; 369 void fp_resstat (const res_state, FILE *) __THROW; 370 void res_npquery (const res_state, const u_char *, int, FILE *) 371 __THROW; 372 const char * res_hostalias (const res_state, const char *, char *, size_t) 373 __THROW; 374 int res_nquery (res_state, const char *, int, int, u_char *, int) 375 __THROW; 376 int res_nsearch (res_state, const char *, int, int, u_char *, int) 377 __THROW; 378 int res_nquerydomain (res_state, const char *, const char *, int, 379 int, u_char *, int) __THROW; 380 int res_nmkquery (res_state, int, const char *, int, int, 381 const u_char *, int, const u_char *, u_char *, 382 int) __THROW; 383 int res_nsend (res_state, const u_char *, int, u_char *, int) 384 __THROW; 385 void res_nclose (res_state) __THROW; 386 __END_DECLS 387 #endif 388 389 #endif /* !_RESOLV_H_ */ 390