1 /* 2 * Portions Copyright (C) 2004, 2005, 2008, 2009 Internet Systems Consortium, Inc. ("ISC") 3 * Portions Copyright (C) 1995-2003 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /* 19 * Copyright (c) 1983, 1987, 1989 20 * The Regents of the University of California. All rights reserved. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * This product includes software developed by the University of 33 * California, Berkeley and its contributors. 34 * 4. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 */ 50 51 /*% 52 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 53 * $Id: resolv.h,v 1.30 2009/03/03 01:52:48 each Exp $ 54 */ 55 56 #ifndef _RESOLV_H_ 57 #define _RESOLV_H_ 58 59 #include <sys/param.h> 60 #if (!defined(BSD)) || (BSD < 199306) 61 # include <sys/bitypes.h> 62 #else 63 # include <sys/types.h> 64 #endif 65 #include <sys/cdefs.h> 66 #include <sys/socket.h> 67 #include <stdio.h> 68 #include <arpa/nameser.h> 69 70 /*% 71 * Revision information. This is the release date in YYYYMMDD format. 72 * It can change every day so the right thing to do with it is use it 73 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 74 * compare for equality; rather, use it to determine whether your resolver 75 * is new enough to contain a certain feature. 76 */ 77 78 #define __RES 20090302 79 80 /*% 81 * This used to be defined in res_query.c, now it's in herror.c. 82 * [XXX no it's not. It's in irs/irs_data.c] 83 * It was 84 * never extern'd by any *.h file before it was placed here. For thread 85 * aware programs, the last h_errno value set is stored in res->h_errno. 86 * 87 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO 88 * (and __h_errno_set) to the public via <resolv.h>. 89 * XXX: __h_errno_set is really part of IRS, not part of the resolver. 90 * If somebody wants to build and use a resolver that doesn't use IRS, 91 * what do they do? Perhaps something like 92 * #ifdef WANT_IRS 93 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) 94 * #else 95 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) 96 * #endif 97 */ 98 99 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) 100 struct __res_state; /*%< forward */ 101 __BEGIN_DECLS 102 void __h_errno_set(struct __res_state *res, int err); 103 __END_DECLS 104 105 /*% 106 * Resolver configuration file. 107 * Normally not present, but may contain the address of the 108 * initial name server(s) to query and the domain search list. 109 */ 110 111 #ifndef _PATH_RESCONF 112 #define _PATH_RESCONF "/etc/resolv.conf" 113 #endif 114 115 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 116 res_sendhookact; 117 118 #ifndef __PMT 119 #if defined(__STDC__) || defined(__cplusplus) 120 #define __PMT(args) args 121 #else 122 #define __PMT(args) () 123 #endif 124 #endif 125 126 typedef res_sendhookact (*res_send_qhook)__PMT((struct sockaddr * const *, 127 const u_char **, int *, 128 u_char *, int, int *)); 129 130 typedef res_sendhookact (*res_send_rhook)__PMT((const struct sockaddr *, 131 const u_char *, int, u_char *, 132 int, int *)); 133 134 struct res_sym { 135 int number; /*%< Identifying number, like T_MX */ 136 const char * name; /*%< Its symbolic name, like "MX" */ 137 const char * humanname; /*%< Its fun name, like "mail exchanger" */ 138 }; 139 140 /*% 141 * Global defines and variables for resolver stub. 142 */ 143 #define MAXNS 3 /*%< max # name servers we'll track */ 144 #define MAXDFLSRCH 3 /*%< # default domain levels to try */ 145 #define MAXDNSRCH 6 /*%< max # domains in search path */ 146 #define LOCALDOMAINPARTS 2 /*%< min levels in name that is "local" */ 147 #define RES_TIMEOUT 5 /*%< min. seconds between retries */ 148 #define MAXRESOLVSORT 10 /*%< number of net to sort on */ 149 #define RES_MAXNDOTS 15 /*%< should reflect bit field size */ 150 #define RES_MAXRETRANS 30 /*%< only for resolv.conf/RES_OPTIONS */ 151 #define RES_MAXRETRY 5 /*%< only for resolv.conf/RES_OPTIONS */ 152 #define RES_DFLRETRY 2 /*%< Default #/tries. */ 153 #define RES_MAXTIME 65535 /*%< Infinity, in milliseconds. */ 154 struct __res_state_ext; 155 156 struct __res_state { 157 int retrans; /*%< retransmission time interval */ 158 int retry; /*%< number of times to retransmit */ 159 #ifdef sun 160 u_int options; /*%< option flags - see below. */ 161 #else 162 u_long options; /*%< option flags - see below. */ 163 #endif 164 int nscount; /*%< number of name servers */ 165 struct sockaddr_in 166 nsaddr_list[MAXNS]; /*%< address of name server */ 167 #define nsaddr nsaddr_list[0] /*%< for backward compatibility */ 168 u_short id; /*%< current message id */ 169 char *dnsrch[MAXDNSRCH+1]; /*%< components of domain to search */ 170 char defdname[256]; /*%< default domain (deprecated) */ 171 #ifdef sun 172 u_int pfcode; /*%< RES_PRF_ flags - see below. */ 173 #else 174 u_long pfcode; /*%< RES_PRF_ flags - see below. */ 175 #endif 176 unsigned ndots:4; /*%< threshold for initial abs. query */ 177 unsigned nsort:4; /*%< number of elements in sort_list[] */ 178 char unused[3]; 179 struct { 180 struct in_addr addr; 181 u_int32_t mask; 182 } sort_list[MAXRESOLVSORT]; 183 res_send_qhook qhook; /*%< query hook */ 184 res_send_rhook rhook; /*%< response hook */ 185 int res_h_errno; /*%< last one set for this context */ 186 int _vcsock; /*%< PRIVATE: for res_send VC i/o */ 187 u_int _flags; /*%< PRIVATE: see below */ 188 u_char _rnd[16]; /*%< PRIVATE: random state */ 189 u_int _pad; /*%< make _u 64 bit aligned */ 190 union { 191 /* On an 32-bit arch this means 512b total. */ 192 char pad[56 - 4*sizeof (int) - 2*sizeof (void *)]; 193 struct { 194 u_int16_t nscount; 195 u_int16_t nstimes[MAXNS]; /*%< ms. */ 196 int nssocks[MAXNS]; 197 struct __res_state_ext *ext; /*%< extention for IPv6 */ 198 } _ext; 199 } _u; 200 }; 201 202 typedef struct __res_state *res_state; 203 204 union res_sockaddr_union { 205 struct sockaddr_in sin; 206 #ifdef IN6ADDR_ANY_INIT 207 struct sockaddr_in6 sin6; 208 #endif 209 #ifdef ISC_ALIGN64 210 int64_t __align64; /*%< 64bit alignment */ 211 #else 212 int32_t __align32; /*%< 32bit alignment */ 213 #endif 214 char __space[128]; /*%< max size */ 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 #define RES_F_EDNS0ERR 0x00000004 /*%< EDNS0 caused errors */ 223 #define RES_F__UNUSED 0x00000008 /*%< (unused) */ 224 #define RES_F_LASTMASK 0x000000F0 /*%< ordinal server of last res_nsend */ 225 #define RES_F_LASTSHIFT 4 /*%< bit position of LASTMASK "flag" */ 226 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT) 227 228 /* res_findzonecut2() options */ 229 #define RES_EXHAUSTIVE 0x00000001 /*%< always do all queries */ 230 #define RES_IPV4ONLY 0x00000002 /*%< IPv4 only */ 231 #define RES_IPV6ONLY 0x00000004 /*%< IPv6 only */ 232 233 /*% 234 * Resolver options (keep these in synch with res_debug.c, please) 235 */ 236 #define RES_INIT 0x00000001 /*%< address initialized */ 237 #define RES_DEBUG 0x00000002 /*%< print debug messages */ 238 #define RES_AAONLY 0x00000004 /*%< authoritative answers only (!IMPL)*/ 239 #define RES_USEVC 0x00000008 /*%< use virtual circuit */ 240 #define RES_PRIMARY 0x00000010 /*%< query primary server only (!IMPL) */ 241 #define RES_IGNTC 0x00000020 /*%< ignore trucation errors */ 242 #define RES_RECURSE 0x00000040 /*%< recursion desired */ 243 #define RES_DEFNAMES 0x00000080 /*%< use default domain name */ 244 #define RES_STAYOPEN 0x00000100 /*%< Keep TCP socket open */ 245 #define RES_DNSRCH 0x00000200 /*%< search up local domain tree */ 246 #define RES_INSECURE1 0x00000400 /*%< type 1 security disabled */ 247 #define RES_INSECURE2 0x00000800 /*%< type 2 security disabled */ 248 #define RES_NOALIASES 0x00001000 /*%< shuts off HOSTALIASES feature */ 249 #define RES_USE_INET6 0x00002000 /*%< use/map IPv6 in gethostbyname() */ 250 #define RES_ROTATE 0x00004000 /*%< rotate ns list after each query */ 251 #define RES_NOCHECKNAME 0x00008000 /*%< do not check names for sanity. */ 252 #define RES_KEEPTSIG 0x00010000 /*%< do not strip TSIG records */ 253 #define RES_BLAST 0x00020000 /*%< blast all recursive servers */ 254 #define RES_NSID 0x00040000 /*%< request name server ID */ 255 #define RES_NOTLDQUERY 0x00100000 /*%< don't unqualified name as a tld */ 256 #define RES_USE_DNSSEC 0x00200000 /*%< use DNSSEC using OK bit in OPT */ 257 /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */ 258 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 259 #define RES_USE_DNAME 0x10000000 /*%< use DNAME */ 260 #define RES_USE_EDNS0 0x40000000 /*%< use EDNS0 if configured */ 261 #define RES_NO_NIBBLE2 0x80000000 /*%< disable alternate nibble lookup */ 262 263 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | \ 264 RES_DNSRCH | RES_NO_NIBBLE2) 265 266 /*% 267 * Resolver "pfcode" values. Used by dig. 268 */ 269 #define RES_PRF_STATS 0x00000001 270 #define RES_PRF_UPDATE 0x00000002 271 #define RES_PRF_CLASS 0x00000004 272 #define RES_PRF_CMD 0x00000008 273 #define RES_PRF_QUES 0x00000010 274 #define RES_PRF_ANS 0x00000020 275 #define RES_PRF_AUTH 0x00000040 276 #define RES_PRF_ADD 0x00000080 277 #define RES_PRF_HEAD1 0x00000100 278 #define RES_PRF_HEAD2 0x00000200 279 #define RES_PRF_TTLID 0x00000400 280 #define RES_PRF_HEADX 0x00000800 281 #define RES_PRF_QUERY 0x00001000 282 #define RES_PRF_REPLY 0x00002000 283 #define RES_PRF_INIT 0x00004000 284 #define RES_PRF_TRUNC 0x00008000 285 /* 0x00010000 */ 286 287 /* Things involving an internal (static) resolver context. */ 288 #ifdef _REENTRANT 289 __BEGIN_DECLS 290 extern struct __res_state *__res_state(void); 291 __END_DECLS 292 #define _res (*__res_state()) 293 #else 294 #ifdef __linux 295 __BEGIN_DECLS 296 extern struct __res_state * __res_state(void); 297 __END_DECLS 298 #endif 299 #ifndef __BIND_NOSTATIC 300 extern struct __res_state _res; 301 #endif 302 #endif 303 304 #ifndef __BIND_NOSTATIC 305 #define fp_nquery __fp_nquery 306 #define fp_query __fp_query 307 #define hostalias __hostalias 308 #define p_query __p_query 309 #define res_close __res_close 310 #define res_init __res_init 311 #define res_isourserver __res_isourserver 312 #define res_mkquery __res_mkquery 313 #define res_query __res_query 314 #define res_querydomain __res_querydomain 315 #define res_search __res_search 316 #define res_send __res_send 317 #define res_sendsigned __res_sendsigned 318 319 __BEGIN_DECLS 320 void fp_nquery __P((const u_char *, int, FILE *)); 321 void fp_query __P((const u_char *, FILE *)); 322 const char * hostalias __P((const char *)); 323 void p_query __P((const u_char *)); 324 void res_close __P((void)); 325 int res_init __P((void)); 326 int res_isourserver __P((const struct sockaddr_in *)); 327 int res_mkquery __P((int, const char *, int, int, const u_char *, 328 int, const u_char *, u_char *, int)); 329 int res_query __P((const char *, int, int, u_char *, int)); 330 int res_querydomain __P((const char *, const char *, int, int, 331 u_char *, int)); 332 int res_search __P((const char *, int, int, u_char *, int)); 333 int res_send __P((const u_char *, int, u_char *, int)); 334 int res_sendsigned __P((const u_char *, int, ns_tsig_key *, 335 u_char *, int)); 336 __END_DECLS 337 #endif 338 339 #if !defined(SHARED_LIBBIND) || defined(LIB) 340 /* 341 * If libbind is a shared object (well, DLL anyway) 342 * these externs break the linker when resolv.h is 343 * included by a lib client (like named) 344 * Make them go away if a client is including this 345 * 346 */ 347 extern const struct res_sym __p_key_syms[]; 348 extern const struct res_sym __p_cert_syms[]; 349 extern const struct res_sym __p_class_syms[]; 350 extern const struct res_sym __p_type_syms[]; 351 extern const struct res_sym __p_rcode_syms[]; 352 #endif /* SHARED_LIBBIND */ 353 354 #define b64_ntop __b64_ntop 355 #define b64_pton __b64_pton 356 #define dn_comp __dn_comp 357 #define dn_count_labels __dn_count_labels 358 #define dn_expand __dn_expand 359 #define dn_skipname __dn_skipname 360 #define fp_resstat __fp_resstat 361 #define loc_aton __loc_aton 362 #define loc_ntoa __loc_ntoa 363 #define p_cdname __p_cdname 364 #define p_cdnname __p_cdnname 365 #define p_class __p_class 366 #define p_fqname __p_fqname 367 #define p_fqnname __p_fqnname 368 #define p_option __p_option 369 #define p_secstodate __p_secstodate 370 #define p_section __p_section 371 #define p_time __p_time 372 #define p_type __p_type 373 #define p_rcode __p_rcode 374 #define p_sockun __p_sockun 375 #define putlong __putlong 376 #define putshort __putshort 377 #define res_dnok __res_dnok 378 #define res_findzonecut __res_findzonecut 379 #define res_findzonecut2 __res_findzonecut2 380 #define res_hnok __res_hnok 381 #define res_hostalias __res_hostalias 382 #define res_mailok __res_mailok 383 #define res_nameinquery __res_nameinquery 384 #define res_nclose __res_nclose 385 #define res_ninit __res_ninit 386 #define res_nmkquery __res_nmkquery 387 #define res_pquery __res_pquery 388 #define res_nquery __res_nquery 389 #define res_nquerydomain __res_nquerydomain 390 #define res_nsearch __res_nsearch 391 #define res_nsend __res_nsend 392 #define res_nsendsigned __res_nsendsigned 393 #define res_nisourserver __res_nisourserver 394 #define res_ownok __res_ownok 395 #define res_queriesmatch __res_queriesmatch 396 #define res_rndinit __res_rndinit 397 #define res_randomid __res_randomid 398 #define res_nrandomid __res_nrandomid 399 #define sym_ntop __sym_ntop 400 #define sym_ntos __sym_ntos 401 #define sym_ston __sym_ston 402 #define res_nopt __res_nopt 403 #define res_nopt_rdata __res_nopt_rdata 404 #define res_ndestroy __res_ndestroy 405 #define res_nametoclass __res_nametoclass 406 #define res_nametotype __res_nametotype 407 #define res_setservers __res_setservers 408 #define res_getservers __res_getservers 409 #define res_buildprotolist __res_buildprotolist 410 #define res_destroyprotolist __res_destroyprotolist 411 #define res_destroyservicelist __res_destroyservicelist 412 #define res_get_nibblesuffix __res_get_nibblesuffix 413 #define res_get_nibblesuffix2 __res_get_nibblesuffix2 414 #define res_ourserver_p __res_ourserver_p 415 #define res_protocolname __res_protocolname 416 #define res_protocolnumber __res_protocolnumber 417 #define res_send_setqhook __res_send_setqhook 418 #define res_send_setrhook __res_send_setrhook 419 #define res_servicename __res_servicename 420 #define res_servicenumber __res_servicenumber 421 __BEGIN_DECLS 422 int res_hnok __P((const char *)); 423 int res_ownok __P((const char *)); 424 int res_mailok __P((const char *)); 425 int res_dnok __P((const char *)); 426 int sym_ston __P((const struct res_sym *, const char *, int *)); 427 const char * sym_ntos __P((const struct res_sym *, int, int *)); 428 const char * sym_ntop __P((const struct res_sym *, int, int *)); 429 int b64_ntop __P((u_char const *, size_t, char *, size_t)); 430 int b64_pton __P((char const *, u_char *, size_t)); 431 int loc_aton __P((const char *, u_char *)); 432 const char * loc_ntoa __P((const u_char *, char *)); 433 int dn_skipname __P((const u_char *, const u_char *)); 434 void putlong __P((u_int32_t, u_char *)); 435 void putshort __P((u_int16_t, u_char *)); 436 #ifndef __ultrix__ 437 u_int16_t _getshort __P((const u_char *)); 438 u_int32_t _getlong __P((const u_char *)); 439 #endif 440 const char * p_class __P((int)); 441 const char * p_time __P((u_int32_t)); 442 const char * p_type __P((int)); 443 const char * p_rcode __P((int)); 444 const char * p_sockun __P((union res_sockaddr_union, char *, size_t)); 445 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *)); 446 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *)); 447 const u_char * p_fqnname __P((const u_char *, const u_char *, 448 int, char *, int)); 449 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *)); 450 const char * p_option __P((u_long)); 451 char * p_secstodate __P((u_long)); 452 int dn_count_labels __P((const char *)); 453 int dn_comp __P((const char *, u_char *, int, 454 u_char **, u_char **)); 455 int dn_expand __P((const u_char *, const u_char *, const u_char *, 456 char *, int)); 457 void res_rndinit __P((res_state)); 458 u_int res_randomid __P((void)); 459 u_int res_nrandomid __P((res_state)); 460 int res_nameinquery __P((const char *, int, int, const u_char *, 461 const u_char *)); 462 int res_queriesmatch __P((const u_char *, const u_char *, 463 const u_char *, const u_char *)); 464 const char * p_section __P((int, int)); 465 /* Things involving a resolver context. */ 466 int res_ninit __P((res_state)); 467 int res_nisourserver __P((const res_state, 468 const struct sockaddr_in *)); 469 void fp_resstat __P((const res_state, FILE *)); 470 void res_pquery __P((const res_state, const u_char *, int, FILE *)); 471 const char * res_hostalias __P((const res_state, const char *, 472 char *, size_t)); 473 int res_nquery __P((res_state, const char *, int, int, 474 u_char *, int)); 475 int res_nsearch __P((res_state, const char *, int, int, u_char *, 476 int)); 477 int res_nquerydomain __P((res_state, const char *, const char *, 478 int, int, u_char *, int)); 479 int res_nmkquery __P((res_state, int, const char *, int, int, 480 const u_char *, int, const u_char *, 481 u_char *, int)); 482 int res_nsend __P((res_state, const u_char *, int, u_char *, int)); 483 int res_nsendsigned __P((res_state, const u_char *, int, 484 ns_tsig_key *, u_char *, int)); 485 int res_findzonecut __P((res_state, const char *, ns_class, int, 486 char *, size_t, struct in_addr *, int)); 487 int res_findzonecut2 __P((res_state, const char *, ns_class, int, 488 char *, size_t, 489 union res_sockaddr_union *, int)); 490 void res_nclose __P((res_state)); 491 int res_nopt __P((res_state, int, u_char *, int, int)); 492 int res_nopt_rdata __P((res_state, int, u_char *, int, u_char *, 493 u_short, u_short, u_char *)); 494 void res_send_setqhook __P((res_send_qhook)); 495 void res_send_setrhook __P((res_send_rhook)); 496 int __res_vinit __P((res_state, int)); 497 void res_destroyservicelist __P((void)); 498 const char * res_servicename __P((u_int16_t, const char *)); 499 const char * res_protocolname __P((int)); 500 void res_destroyprotolist __P((void)); 501 void res_buildprotolist __P((void)); 502 const char * res_get_nibblesuffix __P((res_state)); 503 const char * res_get_nibblesuffix2 __P((res_state)); 504 void res_ndestroy __P((res_state)); 505 u_int16_t res_nametoclass __P((const char *, int *)); 506 u_int16_t res_nametotype __P((const char *, int *)); 507 void res_setservers __P((res_state, 508 const union res_sockaddr_union *, int)); 509 int res_getservers __P((res_state, 510 union res_sockaddr_union *, int)); 511 __END_DECLS 512 513 #endif /* !_RESOLV_H_ */ 514 /*! \file */ 515