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 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 */ 116 struct __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 /* I assume that the intention is to store all 142 * DNS servers' addresses here, and duplicate in nsaddr_list[] 143 * those which have IPv4 address. In the case of IPv4 address 144 * _u._ext.nsaddrs[x] will point to some nsaddr_list[y], 145 * otherwise it will point into malloc'ed sockaddr_in6. 146 * nscount is the number of IPv4 addresses and _u._ext.nscount 147 * is the number of addresses of all kinds. 148 * 149 * If this differs from established usage and you need 150 * to change this, please describe how it is supposed to work. 151 */ 152 union { 153 struct { 154 #ifdef __UCLIBC_HAS_IPV6__ 155 struct sockaddr_in6 *nsaddrs[MAXNS]; 156 #endif 157 u_int8_t nscount; /* (was: u_int16_t) */ 158 #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__ 159 /* rather obscure, and differs in BSD and glibc */ 160 u_int16_t nstimes[MAXNS]; 161 int nssocks[MAXNS]; 162 u_int16_t nscount6; 163 u_int16_t nsinit; 164 /* glibc also has: */ 165 /*u_int16_t nsmap[MAXNS];*/ 166 /*unsigned long long initstamp;*/ 167 #endif 168 } _ext; 169 } _u; 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 }; 181 182 typedef 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 210 211 struct 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 281 extern 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 #endif 296 #define res_mkquery __res_mkquery 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 0 306 void fp_nquery (const u_char *, int, FILE *) __THROW; 307 void fp_query (const u_char *, FILE *) __THROW; 308 const char * hostalias (const char *) __THROW; 309 void p_query (const u_char *) __THROW; 310 #endif 311 #ifdef __UCLIBC_HAS_BSD_RES_CLOSE__ 312 void res_close (void) __THROW; 313 #endif 314 int res_init (void) __THROW; 315 libc_hidden_proto(res_init) 316 #if 0 317 int res_isourserver (const struct sockaddr_in *) __THROW; 318 #endif 319 int res_mkquery (int, const char *, int, int, const u_char *, 320 int, const u_char *, u_char *, int) __THROW; 321 int res_query (const char *, int, int, u_char *, int) __THROW; 322 libc_hidden_proto(res_query) 323 int res_querydomain (const char *, const char *, int, int, 324 u_char *, int) __THROW; 325 libc_hidden_proto(res_querydomain) 326 int res_search (const char *, int, int, u_char *, int) __THROW; 327 #if 0 328 int res_send (const u_char *, int, u_char *, int) __THROW; 329 #endif 330 __END_DECLS 331 332 #if 0 333 #define b64_ntop __b64_ntop 334 #define b64_pton __b64_pton 335 #define dn_count_labels __dn_count_labels 336 #endif 337 #define dn_comp __dn_comp 338 #define dn_expand __dn_expand 339 #define dn_skipname __dn_skipname 340 #define res_ninit __res_ninit 341 #define res_nclose __res_nclose 342 #if 0 343 #define fp_resstat __fp_resstat 344 #define loc_aton __loc_aton 345 #define loc_ntoa __loc_ntoa 346 #define p_cdname __p_cdname 347 #define p_cdnname __p_cdnname 348 #define p_class __p_class 349 #define p_fqname __p_fqname 350 #define p_fqnname __p_fqnname 351 #define p_option __p_option 352 #define p_secstodate __p_secstodate 353 #define p_section __p_section 354 #define p_time __p_time 355 #define p_type __p_type 356 #define p_rcode __p_rcode 357 #define putlong __putlong 358 #define putshort __putshort 359 #define res_dnok __res_dnok 360 #define res_hnok __res_hnok 361 #define res_hostalias __res_hostalias 362 #define res_mailok __res_mailok 363 #define res_nameinquery __res_nameinquery 364 #define res_nmkquery __res_nmkquery 365 #define res_npquery __res_npquery 366 #define res_nquery __res_nquery 367 #define res_nquerydomain __res_nquerydomain 368 #define res_nsearch __res_nsearch 369 #define res_nsend __res_nsend 370 #define res_nisourserver __res_nisourserver 371 #define res_ownok __res_ownok 372 #define res_queriesmatch __res_queriesmatch 373 #define res_randomid __res_randomid 374 #define sym_ntop __sym_ntop 375 #define sym_ntos __sym_ntos 376 #define sym_ston __sym_ston 377 #endif 378 __BEGIN_DECLS 379 #if 0 380 int res_hnok (const char *) __THROW; 381 int res_ownok (const char *) __THROW; 382 int res_mailok (const char *) __THROW; 383 int res_dnok (const char *) __THROW; 384 int sym_ston (const struct res_sym *, const char *, int *) __THROW; 385 const char * sym_ntos (const struct res_sym *, int, int *) __THROW; 386 const char * sym_ntop (const struct res_sym *, int, int *) __THROW; 387 int b64_ntop (u_char const *, size_t, char *, size_t) __THROW; 388 int b64_pton (char const *, u_char *, size_t) __THROW; 389 int loc_aton (const char *ascii, u_char *binary) __THROW; 390 const char * loc_ntoa (const u_char *binary, char *ascii) __THROW; 391 void putlong (u_int32_t, u_char *) __THROW; 392 void putshort (u_int16_t, u_char *) __THROW; 393 const char * p_class (int) __THROW; 394 const char * p_time (u_int32_t) __THROW; 395 const char * p_type (int) __THROW; 396 const char * p_rcode (int) __THROW; 397 const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *) 398 __THROW; 399 const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW; 400 const u_char * p_fqnname (const u_char *cp, const u_char *msg, 401 int, char *, int) __THROW; 402 const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW; 403 const char * p_option (u_long option) __THROW; 404 char * p_secstodate (u_long) __THROW; 405 int dn_count_labels (const char *) __THROW; 406 #endif 407 int dn_skipname (const u_char *, const u_char *) __THROW; 408 libc_hidden_proto(dn_skipname) 409 int dn_comp (const char *, u_char *, int, u_char **, u_char **) 410 __THROW; 411 libc_hidden_proto(dn_comp) 412 int dn_expand (const u_char *, const u_char *, const u_char *, 413 char *, int) __THROW; 414 libc_hidden_proto(dn_expand) 415 int res_ninit (res_state) __THROW; 416 void res_nclose (res_state) __THROW; 417 #if 0 418 u_int res_randomid (void) __THROW; 419 int res_nameinquery (const char *, int, int, 420 const u_char *, const u_char *) __THROW; 421 int res_queriesmatch (const u_char *, const u_char *, 422 const u_char *, const u_char *) __THROW; 423 const char * p_section (int section, int opcode) __THROW; 424 /* Things involving a resolver context. */ 425 int res_nisourserver (const res_state, 426 const struct sockaddr_in *) __THROW; 427 void fp_resstat (const res_state, FILE *) __THROW; 428 void res_npquery (const res_state, const u_char *, int, FILE *) 429 __THROW; 430 const char * res_hostalias (const res_state, const char *, char *, size_t) 431 __THROW; 432 int res_nquery (res_state, const char *, int, int, u_char *, int) 433 __THROW; 434 int res_nsearch (res_state, const char *, int, int, u_char *, int) 435 __THROW; 436 int res_nquerydomain (res_state, const char *, const char *, int, 437 int, u_char *, int) __THROW; 438 int res_nmkquery (res_state, int, const char *, int, int, 439 const u_char *, int, const u_char *, u_char *, 440 int) __THROW; 441 int res_nsend (res_state, const u_char *, int, u_char *, int) 442 __THROW; 443 #endif 444 __END_DECLS 445 446 # if _LIBC 447 # ifdef __UCLIBC_HAS_THREADS__ 448 # if defined __UCLIBC_HAS_TLS__ \ 449 && (!defined NOT_IN_libc || defined IS_IN_libpthread) 450 # undef _res 451 # ifndef NOT_IN_libc 452 # define __resp __libc_resp 453 # endif 454 # define _res (*__resp) 455 extern __thread struct __res_state *__resp attribute_tls_model_ie; 456 # endif 457 # else 458 # undef _res 459 # define _res (*__resp) 460 extern struct __res_state *__resp; 461 # endif /* __UCLIBC_HAS_THREADS__ */ 462 # endif /* _LIBC */ 463 464 #endif /* _RESOLV_H_ */ 465 466 #endif /* !_RESOLV_H_ */ 467