include/resolv.h

   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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  36  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  37  *
  38  * Permission to use, copy, modify, and distribute this software for any
  39  * purpose with or without fee is hereby granted, provided that the above
  40  * copyright notice and this permission notice appear in all copies.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  43  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  44  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  45  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  46  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  47  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  48  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  49  */
  50
  51 /*
  52  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
  53  *      $Id: resolv.h,v 1.19.18.4 2008/04/03 23:15:15 marka Exp $
  54  * $FreeBSD: src/include/resolv.h,v 1.33 2008/12/14 19:39:53 ume Exp $
  55  * $DragonFly: src/include/resolv.h,v 1.4 2004/02/26 13:58:25 joerg Exp $
  56  */
  57
  58 #ifndef _RESOLV_H_
  59 #define _RESOLV_H_
  60
  61 #include <sys/param.h>
  62 #include <sys/types.h>
  63 #include <sys/cdefs.h>
  64 #include <sys/socket.h>
  65 #include <stdio.h>
  66 #include <arpa/nameser.h>
  67
  68 /*
  69  * Revision information.  This is the release date in YYYYMMDD format.
  70  * It can change every day so the right thing to do with it is use it
  71  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  72  * compare for equality; rather, use it to determine whether your resolver
  73  * is new enough to contain a certain feature.
  74  */
  75
  76 #define __RES   20030124
  77
  78 /*
  79  * This used to be defined in res_query.c, now it's in herror.c.
  80  * [XXX no it's not.  It's in irs/irs_data.c]
  81  * It was
  82  * never extern'd by any *.h file before it was placed here.  For thread
  83  * aware programs, the last h_errno value set is stored in res->h_errno.
  84  *
  85  * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
  86  *      (and __h_errno_set) to the public via <resolv.h>.
  87  * XXX: __h_errno_set is really part of IRS, not part of the resolver.
  88  *      If somebody wants to build and use a resolver that doesn't use IRS,
  89  *      what do they do?  Perhaps something like
  90  *              #ifdef WANT_IRS
  91  *              # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  92  *              #else
  93  *              # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
  94  *              #endif
  95  */
  96
  97 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  98 struct __res_state; /*%< forward */
  99 __BEGIN_DECLS
 100 void __h_errno_set(struct __res_state *, int);
 101 __END_DECLS
 102
 103 /*%
 104  * Resolver configuration file.
 105  * Normally not present, but may contain the address of the
 106  * initial name server(s) to query and the domain search list.
 107  */
 108
 109 #ifndef _PATH_RESCONF
 110 #define _PATH_RESCONF        "/etc/resolv.conf"
 111 #endif
 112
 113 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
 114         res_sendhookact;
 115
 116 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
 117                                           const u_char **, int *,
 118                                           u_char *, int, int *);
 119
 120 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
 121                                           const u_char *, int, u_char *,
 122                                           int, int *);
 123
 124 struct res_sym {
 125         int             number;     /* Identifying number, like T_MX */
 126         const char      *name;      /* Its symbolic name, like "MX" */
 127         const char      *humanname; /* Its fun name, like "mail exchanger" */
 128 };
 129
 130 /*
 131  * Global defines and variables for resolver stub.
 132  */
 133 #define MAXNS                   3       /* max # name servers we'll track */
 134 #define MAXDFLSRCH              3       /* # default domain levels to try */
 135 #define MAXDNSRCH               6       /* max # domains in search path */
 136 #define LOCALDOMAINPARTS        2       /* min levels in name that is "local" */
 137 #define RES_TIMEOUT             5       /* min. seconds between retries */
 138 #define MAXRESOLVSORT           10      /* number of net to sort on */
 139 #define RES_MAXNDOTS            15      /* should reflect bit field size */
 140 #define RES_MAXRETRANS          30      /* only for resolv.conf/RES_OPTIONS */
 141 #define RES_MAXRETRY            5       /* only for resolv.conf/RES_OPTIONS */
 142 #define RES_DFLRETRY            2       /* Default #/tries. */
 143 #define RES_MAXTIME             65535   /* Infinity, in milliseconds. */
 144 struct __res_state_ext;
 145
 146 struct __res_state {
 147         int     retrans;                /* retransmission time interval */
 148         int     retry;                  /* number of times to retransmit */
 149         u_long  options;                /* option flags - see below. */
 150         int     nscount;                /* number of name servers */
 151         struct sockaddr_in
 152                 nsaddr_list[MAXNS];     /* address of name server */
 153 #define nsaddr  nsaddr_list[0]          /* for backward compatibility */
 154         u_short id;                     /* current message id */
 155         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
 156         char    defdname[256];          /* default domain (deprecated) */
 157         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
 158         unsigned ndots:4;               /* threshold for initial abs. query */
 159         unsigned nsort:4;               /* number of elements in sort_list[] */
 160         char    unused[3];
 161         struct {
 162                 struct in_addr  addr;
 163                 u_int32_t       mask;
 164         } sort_list[MAXRESOLVSORT];
 165         res_send_qhook qhook;           /* query hook */
 166         res_send_rhook rhook;           /* response hook */
 167         int     res_h_errno;            /* last one set for this context */
 168         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
 169         u_int   _flags;                 /* PRIVATE: see below */
 170         u_int   _pad;                   /* make _u 64 bit aligned */
 171         union {
 172                 /* On an 32-bit arch this means 512b total. */
 173                 char    pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
 174                 struct {
 175                         u_int16_t               nscount;
 176                         u_int16_t               nstimes[MAXNS]; /* ms. */
 177                         int                     nssocks[MAXNS];
 178                         struct __res_state_ext *ext;    /* extention for IPv6 */
 179                 } _ext;
 180         } _u;
 181 };
 182
 183 typedef struct __res_state *res_state;
 184
 185 union res_sockaddr_union {
 186         struct sockaddr_in      sin;
 187 #ifdef IN6ADDR_ANY_INIT
 188         struct sockaddr_in6     sin6;
 189 #endif
 190 #ifdef ISC_ALIGN64
 191         int64_t                 __align64;      /* 64bit alignment */
 192 #else
 193         int32_t                 __align32;      /* 32bit alignment */
 194 #endif
 195         char                    __space[128];   /* max size */
 196 };
 197
 198 /*
 199  * Resolver flags (used to be discrete per-module statics ints).
 200  */
 201 #define RES_F_VC        0x00000001      /* socket is TCP */
 202 #define RES_F_CONN      0x00000002      /* socket is connected */
 203 #define RES_F_EDNS0ERR  0x00000004      /* EDNS0 caused errors */
 204 #define RES_F__UNUSED   0x00000008      /* (unused) */
 205 #define RES_F_LASTMASK  0x000000F0      /* ordinal server of last res_nsend */
 206 #define RES_F_LASTSHIFT 4               /* bit position of LASTMASK "flag" */
 207 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 208
 209 /* res_findzonecut2() options */
 210 #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
 211 #define RES_IPV4ONLY    0x00000002      /* IPv4 only */
 212 #define RES_IPV6ONLY    0x00000004      /* IPv6 only */
 213
 214 /*
 215  * Resolver options (keep these in synch with res_debug.c, please)
 216  */
 217 #define RES_INIT        0x00000001      /* address initialized */
 218 #define RES_DEBUG       0x00000002      /* print debug messages */
 219 #define RES_AAONLY      0x00000004      /* authoritative answers only (!IMPL)*/
 220 #define RES_USEVC       0x00000008      /* use virtual circuit */
 221 #define RES_PRIMARY     0x00000010      /* query primary server only (!IMPL) */
 222 #define RES_IGNTC       0x00000020      /* ignore truncation errors */
 223 #define RES_RECURSE     0x00000040      /* recursion desired */
 224 #define RES_DEFNAMES    0x00000080      /* use default domain name */
 225 #define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */
 226 #define RES_DNSRCH      0x00000200      /* search up local domain tree */
 227 #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
 228 #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
 229 #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
 230 #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
 231 #define RES_ROTATE      0x00004000      /* rotate ns list after each query */
 232 #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 233 #define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
 234 #define RES_BLAST       0x00020000      /* blast all recursive servers */
 235 #define RES_NSID        0x00040000      /* request name server ID */
 236 #define RES_NOTLDQUERY  0x00100000      /* don't unqualified name as a tld */
 237 #define RES_USE_DNSSEC  0x00200000      /* use DNSSEC using OK bit in OPT */
 238 /* #define RES_DEBUG2   0x00400000 */   /* nslookup internal */
 239 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 240 #define RES_USE_DNAME   0x10000000      /* use DNAME */
 241 #define RES_USE_EDNS0   0x40000000      /* use EDNS0 if configured */
 242 #define RES_NO_NIBBLE2  0x80000000      /* disable alternate nibble lookup */
 243
 244 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | \
 245                          RES_DNSRCH | RES_NO_NIBBLE2)
 246
 247 /*
 248  * Resolver "pfcode" values.  Used by dig.
 249  */
 250 #define RES_PRF_STATS   0x00000001
 251 #define RES_PRF_UPDATE  0x00000002
 252 #define RES_PRF_CLASS   0x00000004
 253 #define RES_PRF_CMD     0x00000008
 254 #define RES_PRF_QUES    0x00000010
 255 #define RES_PRF_ANS     0x00000020
 256 #define RES_PRF_AUTH    0x00000040
 257 #define RES_PRF_ADD     0x00000080
 258 #define RES_PRF_HEAD1   0x00000100
 259 #define RES_PRF_HEAD2   0x00000200
 260 #define RES_PRF_TTLID   0x00000400
 261 #define RES_PRF_HEADX   0x00000800
 262 #define RES_PRF_QUERY   0x00001000
 263 #define RES_PRF_REPLY   0x00002000
 264 #define RES_PRF_INIT    0x00004000
 265 #define RES_PRF_TRUNC   0x00008000
 266 /*                      0x00010000      */
 267
 268 /* Things involving an internal (static) resolver context. */
 269 __BEGIN_DECLS
 270 extern struct __res_state *__res_state(void);
 271 __END_DECLS
 272 #define _res (*__res_state())
 273
 274 #ifndef __BIND_NOSTATIC
 275 #define fp_nquery               __fp_nquery
 276 #define fp_query                __fp_query
 277 #define hostalias               __hostalias
 278 #define p_query                 __p_query
 279 #define res_close               __res_close
 280 #define res_init                __res_init
 281 #define res_isourserver         __res_isourserver
 282 #define res_mkquery             __res_mkquery
 283 #define res_opt                 __res_opt
 284 #define res_query               __res_query
 285 #define res_querydomain         __res_querydomain
 286 #define res_search              __res_search
 287 #define res_send                __res_send
 288 #define res_sendsigned          __res_sendsigned
 289
 290 __BEGIN_DECLS
 291 void            fp_nquery(const u_char *, int, FILE *);
 292 void            fp_query(const u_char *, FILE *);
 293 const char      *hostalias(const char *);
 294 void            p_query(const u_char *);
 295 void            res_close(void);
 296 int             res_init(void);
 297 int             res_isourserver(const struct sockaddr_in *);
 298 int             res_mkquery(int, const char *, int, int, const u_char *,
 299                             int, const u_char *, u_char *, int);
 300 int             res_opt(int, u_char *, int, int);
 301 int             res_query(const char *, int, int, u_char *, int);
 302 int             res_querydomain(const char *, const char *, int, int,
 303                                 u_char *, int);
 304 int             res_search(const char *, int, int, u_char *, int);
 305 int             res_send(const u_char *, int, u_char *, int);
 306 int             res_sendsigned(const u_char *, int, ns_tsig_key *,
 307                                u_char *, int);
 308 __END_DECLS
 309 #endif
 310
 311 #if !defined(SHARED_LIBBIND) || defined(LIB)
 312 /*
 313  * If libbind is a shared object (well, DLL anyway)
 314  * these externs break the linker when resolv.h is
 315  * included by a lib client (like named)
 316  * Make them go away if a client is including this
 317  *
 318  */
 319 extern const struct res_sym __p_key_syms[];
 320 extern const struct res_sym __p_cert_syms[];
 321 extern const struct res_sym __p_class_syms[];
 322 extern const struct res_sym __p_type_syms[];
 323 extern const struct res_sym __p_rcode_syms[];
 324 #endif /* SHARED_LIBBIND */
 325
 326 #define b64_ntop                __b64_ntop
 327 #define b64_pton                __b64_pton
 328 #define dn_comp                 __dn_comp
 329 #define dn_count_labels         __dn_count_labels
 330 #define dn_expand               __dn_expand
 331 #define dn_skipname             __dn_skipname
 332 #define fp_resstat              __fp_resstat
 333 #define loc_aton                __loc_aton
 334 #define loc_ntoa                __loc_ntoa
 335 #define p_cdname                __p_cdname
 336 #define p_cdnname               __p_cdnname
 337 #define p_class                 __p_class
 338 #define p_fqname                __p_fqname
 339 #define p_fqnname               __p_fqnname
 340 #define p_option                __p_option
 341 #define p_secstodate            __p_secstodate
 342 #define p_section               __p_section
 343 #define p_time                  __p_time
 344 #define p_type                  __p_type
 345 #define p_rcode                 __p_rcode
 346 #define p_sockun                __p_sockun
 347 #define putlong                 __putlong
 348 #define putshort                __putshort
 349 #define res_dnok                __res_dnok
 350 #if 0
 351 #define res_findzonecut         __res_findzonecut
 352 #endif
 353 #define res_findzonecut2        __res_findzonecut2
 354 #define res_hnok                __res_hnok
 355 #define res_hostalias           __res_hostalias
 356 #define res_mailok              __res_mailok
 357 #define res_nameinquery         __res_nameinquery
 358 #define res_nclose              __res_nclose
 359 #define res_ninit               __res_ninit
 360 #define res_nmkquery            __res_nmkquery
 361 #define res_pquery              __res_pquery
 362 #define res_nquery              __res_nquery
 363 #define res_nquerydomain        __res_nquerydomain
 364 #define res_nsearch             __res_nsearch
 365 #define res_nsend               __res_nsend
 366 #if 0
 367 #define res_nsendsigned         __res_nsendsigned
 368 #endif
 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 #define res_nopt                __res_nopt
 377 #define res_nopt_rdata          __res_nopt_rdata
 378 #define res_ndestroy            __res_ndestroy
 379 #define res_nametoclass         __res_nametoclass
 380 #define res_nametotype          __res_nametotype
 381 #define res_setservers          __res_setservers
 382 #define res_getservers          __res_getservers
 383 #if 0
 384 #define res_buildprotolist      __res_buildprotolist
 385 #define res_destroyprotolist    __res_destroyprotolist
 386 #define res_destroyservicelist  __res_destroyservicelist
 387 #define res_get_nibblesuffix    __res_get_nibblesuffix
 388 #define res_get_nibblesuffix2   __res_get_nibblesuffix2
 389 #endif
 390 #define res_ourserver_p         __res_ourserver_p
 391 #if 0
 392 #define res_protocolname        __res_protocolname
 393 #define res_protocolnumber      __res_protocolnumber
 394 #endif
 395 #define res_send_setqhook       __res_send_setqhook
 396 #define res_send_setrhook       __res_send_setrhook
 397 #if 0
 398 #define res_servicename         __res_servicename
 399 #define res_servicenumber       __res_servicenumber
 400 #endif
 401 __BEGIN_DECLS
 402 int              res_hnok(const char *);
 403 int              res_ownok(const char *);
 404 int              res_mailok(const char *);
 405 int              res_dnok(const char *);
 406 int              sym_ston(const struct res_sym *, const char *, int *);
 407 const char      *sym_ntos(const struct res_sym *, int, int *);
 408 const char      *sym_ntop(const struct res_sym *, int, int *);
 409 int              b64_ntop(u_char const *, size_t, char *, size_t);
 410 int              b64_pton(char const *, u_char *, size_t);
 411 int              loc_aton(const char *, u_char *);
 412 const char      *loc_ntoa(const u_char *, char *);
 413 int              dn_skipname(const u_char *, const u_char *);
 414 void             putlong(u_int32_t, u_char *);
 415 void             putshort(u_int16_t, u_char *);
 416 u_int16_t       _getshort(const u_char *);
 417 u_int32_t       _getlong(const u_char *);
 418 const char      *p_class(int);
 419 const char      *p_time(u_int32_t);
 420 const char      *p_type(int);
 421 const char      *p_rcode(int);
 422 const char      *p_sockun(union res_sockaddr_union, char *, size_t);
 423 const u_char    *p_cdnname(const u_char *, const u_char *, int, FILE *);
 424 const u_char    *p_cdname(const u_char *, const u_char *, FILE *);
 425 const u_char    *p_fqnname(const u_char *, const u_char *, int, char *, int);
 426 const u_char    *p_fqname(const u_char *, const u_char *, FILE *);
 427 const char      *p_option(u_long);
 428 char            *p_secstodate(u_long);
 429 int              dn_count_labels(const char *);
 430 int              dn_comp(const char *, u_char *, int, u_char **, u_char **);
 431 int              dn_expand(const u_char *, const u_char *, const u_char *,
 432                            char *, int);
 433 u_int            res_randomid(void);
 434 int              res_nameinquery(const char *, int, int, const u_char *,
 435                                  const u_char *);
 436 int              res_queriesmatch(const u_char *, const u_char *,
 437                                   const u_char *, const u_char *);
 438 const char      *p_section(int, int);
 439 /* Things involving a resolver context. */
 440 int              res_ninit(res_state);
 441 int              res_nisourserver(const res_state, const struct sockaddr_in *);
 442 void             fp_resstat(const res_state, FILE *);
 443 void             res_pquery(const res_state, const u_char *, int, FILE *);
 444 const char      *res_hostalias(const res_state, const char *, char *, size_t);
 445 int              res_nquery(res_state, const char *, int, int, u_char *, int);
 446 int              res_nsearch(res_state, const char *, int, int, u_char *, int);
 447 int              res_nquerydomain(res_state, const char *, const char *,
 448                                   int, int, u_char *, int);
 449 int              res_nmkquery(res_state, int, const char *, int, int,
 450                               const u_char *, int, const u_char *,
 451                               u_char *, int);
 452 int              res_nsend(res_state, const u_char *, int, u_char *, int);
 453 #if 0
 454 int              res_nsendsigned(res_state, const u_char *, int,
 455                                  ns_tsig_key *, u_char *, int);
 456 int              res_findzonecut(res_state, const char *, ns_class, int,
 457                                  char *, size_t, struct in_addr *, int);
 458 #endif
 459 int              res_findzonecut2(res_state, const char *, ns_class, int,
 460                                   char *, size_t,
 461                                   union res_sockaddr_union *, int);
 462 void             res_nclose(res_state);
 463 int              res_nopt(res_state, int, u_char *, int, int);
 464 int              res_nopt_rdata(res_state, int, u_char *, int, u_char *,
 465                                 u_short, u_short, u_char *);
 466 void             res_send_setqhook(res_send_qhook);
 467 void             res_send_setrhook(res_send_rhook);
 468 int              __res_vinit(res_state, int);
 469 #if 0
 470 void             res_destroyservicelist(void);
 471 const char      *res_servicename(u_int16_t, const char *);
 472 const char      *res_protocolname(int);
 473 void             res_destroyprotolist(void);
 474 void             res_buildprotolist(void);
 475 const char      *res_get_nibblesuffix(res_state);
 476 const char      *res_get_nibblesuffix2(res_state);
 477 #endif
 478 void             res_ndestroy(res_state);
 479 u_int16_t        res_nametoclass(const char *, int *);
 480 u_int16_t        res_nametotype(const char *, int *);
 481 void             res_setservers(res_state, const union res_sockaddr_union *,
 482                                 int);
 483 int              res_getservers(res_state, union res_sockaddr_union *, int);
 484 __END_DECLS
 485
 486 #endif /* !_RESOLV_H_ */