include/resolv.h

   1 /*      $NetBSD: resolv.h,v 1.39 2012/09/09 18:03:17 christos Exp $     */
   2
   3 /*
   4  * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
   5  * Portions Copyright (C) 1995-2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*
  21  * Copyright (c) 1983, 1987, 1989
  22  *    The Regents of the University of California.  All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. Neither the name of the University nor the names of its contributors
  33  *    may be used to endorse or promote products derived from this software
  34  *    without specific prior written permission.
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  37  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  39  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  40  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  41  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  42  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  44  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  45  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46  * SUCH DAMAGE.
  47  */
  48
  49 /*%
  50  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
  51  *      Id: resolv.h,v 1.30 2009/03/03 01:52:48 each Exp
  52  */
  53
  54 #ifndef _RESOLV_H_
  55 #define _RESOLV_H_
  56
  57 #include <sys/param.h>
  58 #if (!defined(BSD)) || (BSD < 199306)
  59 # include <sys/bitypes.h>
  60 #else
  61 #include <sys/types.h>
  62 #endif
  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   20090302
  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
 145 struct __res_state_ext;
 146
 147 struct __res_state {
 148         int     retrans;                /*%< retransmission time interval */
 149         int     retry;                  /*%< number of times to retransmit */
 150 #ifdef sun
 151         u_int   options;                /*%< option flags - see below. */
 152 #else
 153         u_long  options;                /*%< option flags - see below. */
 154 #endif
 155         int     nscount;                /*%< number of name servers */
 156         struct sockaddr_in
 157                 nsaddr_list[MAXNS];     /*%< address of name server */
 158 #define nsaddr  nsaddr_list[0]          /*%< for backward compatibility */
 159         u_short id;                     /*%< current message id */
 160         char    *dnsrch[MAXDNSRCH+1];   /*%< components of domain to search */
 161         char    defdname[256];          /*%< default domain (deprecated) */
 162 #ifdef sun
 163         u_int   pfcode;                 /*%< RES_PRF_ flags - see below. */
 164 #else
 165         u_long  pfcode;                 /*%< RES_PRF_ flags - see below. */
 166 #endif
 167         unsigned ndots:4;               /*%< threshold for initial abs. query */
 168         unsigned nsort:4;               /*%< number of elements in sort_list[] */
 169         char    unused[3];
 170         struct {
 171                 struct in_addr  addr;
 172                 uint32_t        mask;
 173         } sort_list[MAXRESOLVSORT];
 174 #ifdef __OLD_RES_STATE
 175         char lookups[4];
 176 #else
 177         res_send_qhook qhook;           /*%< query hook */
 178         res_send_rhook rhook;           /*%< response hook */
 179         int     res_h_errno;            /*%< last one set for this context */
 180         int     _vcsock;                /*%< PRIVATE: for res_send VC i/o */
 181         u_int   _flags;                 /*%< PRIVATE: see below */
 182         u_int   _pad;                   /*%< make _u 64 bit aligned */
 183         union {
 184                 /* On an 32-bit arch this means 512b total. */
 185                 char    pad[56 - 4*sizeof (int) - 3*sizeof (void *)];
 186                 struct {
 187                         uint16_t                nscount;
 188                         uint16_t                nstimes[MAXNS]; /*%< ms. */
 189                         int                     nssocks[MAXNS];
 190                         struct __res_state_ext *ext;    /*%< extention for IPv6 */
 191                 } _ext;
 192         } _u;
 193         u_char  *_rnd;                  /*%< PRIVATE: random state */
 194 #endif
 195 };
 196
 197 typedef struct __res_state *res_state;
 198
 199 union res_sockaddr_union {
 200         struct sockaddr_in      sin;
 201 #ifdef IN6ADDR_ANY_INIT
 202         struct sockaddr_in6     sin6;
 203 #endif
 204 #ifdef ISC_ALIGN64
 205         int64_t                 __align64;      /*%< 64bit alignment */
 206 #else
 207         int32_t                 __align32;      /*%< 32bit alignment */
 208 #endif
 209         char                    __space[128];   /* max size */
 210 };
 211
 212 /*%
 213  * Resolver flags (used to be discrete per-module statics ints).
 214  */
 215 #define RES_F_VC        0x00000001      /*%< socket is TCP */
 216 #define RES_F_CONN      0x00000002      /*%< socket is connected */
 217 #define RES_F_EDNS0ERR  0x00000004      /*%< EDNS0 caused errors */
 218 #define RES_F__UNUSED   0x00000008      /*%< (unused) */
 219 #define RES_F_LASTMASK  0x000000F0      /*%< ordinal server of last res_nsend */
 220 #define RES_F_LASTSHIFT 4               /*%< bit position of LASTMASK "flag" */
 221 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 222
 223 /* res_findzonecut2() options */
 224 #define RES_EXHAUSTIVE  0x00000001      /*%< always do all queries */
 225 #define RES_IPV4ONLY    0x00000002      /*%< IPv4 only */
 226 #define RES_IPV6ONLY    0x00000004      /*%< IPv6 only */
 227
 228 /*%
 229  * Resolver options (keep these in synch with res_debug.c, please)
 230  */
 231 #define RES_INIT        0x00000001      /*%< address initialized */
 232 #define RES_DEBUG       0x00000002      /*%< print debug messages */
 233 #define RES_AAONLY      0x00000004      /*%< authoritative answers only (!IMPL)*/
 234 #define RES_USEVC       0x00000008      /*%< use virtual circuit */
 235 #define RES_PRIMARY     0x00000010      /*%< query primary server only (!IMPL) */
 236 #define RES_IGNTC       0x00000020      /*%< ignore trucation errors */
 237 #define RES_RECURSE     0x00000040      /*%< recursion desired */
 238 #define RES_DEFNAMES    0x00000080      /*%< use default domain name */
 239 #define RES_STAYOPEN    0x00000100      /*%< Keep TCP socket open */
 240 #define RES_DNSRCH      0x00000200      /*%< search up local domain tree */
 241 #define RES_INSECURE1   0x00000400      /*%< type 1 security disabled */
 242 #define RES_INSECURE2   0x00000800      /*%< type 2 security disabled */
 243 #define RES_NOALIASES   0x00001000      /*%< shuts off HOSTALIASES feature */
 244 #define RES_USE_INET6   0x00002000      /*%< use/map IPv6 in gethostbyname() */
 245 #define RES_ROTATE      0x00004000      /*%< rotate ns list after each query */
 246 #define RES_NOCHECKNAME 0x00008000      /*%< do not check names for sanity. */
 247 #define RES_KEEPTSIG    0x00010000      /*%< do not strip TSIG records */
 248 #define RES_BLAST       0x00020000      /*%< blast all recursive servers */
 249 #define RES_NSID        0x00040000      /*%< request name server ID */
 250 #define RES_NOTLDQUERY  0x00100000      /*%< don't unqualified name as a tld */
 251 #define RES_USE_DNSSEC  0x00200000      /*%< use DNSSEC using OK bit in OPT */
 252 /* #define RES_DEBUG2   0x00400000 */   /* nslookup internal */
 253 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 254 #define RES_USE_DNAME   0x10000000      /*%< use DNAME */
 255 #define RES_USE_EDNS0   0x40000000      /*%< use EDNS0 if configured */
 256 #define RES_NO_NIBBLE2  0x80000000      /*%< disable alternate nibble lookup */
 257
 258 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | \
 259                          RES_DNSRCH | RES_NO_NIBBLE2 | RES_NOCHECKNAME)
 260
 261 /*%
 262  * Resolver "pfcode" values.  Used by dig.
 263  */
 264 #define RES_PRF_STATS   0x00000001
 265 #define RES_PRF_UPDATE  0x00000002
 266 #define RES_PRF_CLASS   0x00000004
 267 #define RES_PRF_CMD     0x00000008
 268 #define RES_PRF_QUES    0x00000010
 269 #define RES_PRF_ANS     0x00000020
 270 #define RES_PRF_AUTH    0x00000040
 271 #define RES_PRF_ADD     0x00000080
 272 #define RES_PRF_HEAD1   0x00000100
 273 #define RES_PRF_HEAD2   0x00000200
 274 #define RES_PRF_TTLID   0x00000400
 275 #define RES_PRF_HEADX   0x00000800
 276 #define RES_PRF_QUERY   0x00001000
 277 #define RES_PRF_REPLY   0x00002000
 278 #define RES_PRF_INIT    0x00004000
 279 #define RES_PRF_TRUNC   0x00008000
 280 /*                      0x00010000      */
 281
 282 /* Things involving an internal (static) resolver context. */
 283 __BEGIN_DECLS
 284 extern struct __res_state *__res_get_state(void);
 285 extern void __res_put_state(struct __res_state *);
 286
 287 /*
 288  * Source and Binary compatibility; _res will not work properly
 289  * with multi-threaded programs.
 290  */
 291 extern struct __res_state *__res_state(void);
 292 #define _res (*__res_state())
 293
 294 __END_DECLS
 295
 296 #ifndef __BIND_NOSTATIC
 297 #define fp_nquery               __fp_nquery
 298 #define fp_query                __fp_query
 299 #define hostalias               __hostalias
 300 #define p_query                 __p_query
 301 #define res_close               __res_close
 302 #define res_isourserver         __res_isourserver
 303 #define res_opt                 __res_opt
 304 #define res_querydomain         __res_querydomain
 305 #define res_send                __res_send
 306 #define res_sendsigned          __res_sendsigned
 307
 308 #ifdef notdef
 309 /* NetBSD protects these via weak symbols. */
 310 #define res_init                __res_init
 311 #define res_query               __res_query
 312 #define res_mkquery             __res_mkquery
 313 #define dn_expand               __dn_expand
 314 #define res_search              __res_search
 315 #endif
 316
 317 __BEGIN_DECLS
 318 void            fp_nquery(const u_char *, int, FILE *);
 319 void            fp_query(const u_char *, FILE *);
 320 const char *    hostalias(const char *);
 321 void            p_query(const u_char *);
 322 void            res_close(void);
 323 int             res_init(void);
 324 int             res_opt(int, u_char *, int, int);
 325 int             res_isourserver(const struct sockaddr_in *);
 326 int             res_mkquery(int, const char *, int, int, const u_char *,
 327                                  int, const u_char *, u_char *, int);
 328 int             res_query(const char *, int, int, u_char *, int);
 329 int             res_querydomain(const char *, const char *, int, int,
 330                                      u_char *, int);
 331 int             res_search(const char *, int, int, u_char *, int);
 332 int             res_send(const u_char *, int, u_char *, int);
 333 int             res_sendsigned(const u_char *, int, ns_tsig_key *,
 334                                     u_char *, int);
 335 __END_DECLS
 336 #endif
 337
 338 #if !defined(SHARED_LIBBIND) || defined(LIB)
 339 /*
 340  * If libbind is a shared object (well, DLL anyway)
 341  * these externs break the linker when resolv.h is
 342  * included by a lib client (like named)
 343  * Make them go away if a client is including this
 344  *
 345  */
 346 extern const struct res_sym __p_key_syms[];
 347 extern const struct res_sym __p_cert_syms[];
 348 extern const struct res_sym __p_class_syms[];
 349 extern const struct res_sym __p_type_syms[];
 350 extern const struct res_sym __p_rcode_syms[];
 351 #endif /* SHARED_LIBBIND */
 352
 353 #define b64_ntop                __b64_ntop
 354 #define b64_pton                __b64_pton
 355 #define dn_comp                 __dn_comp
 356 #define dn_count_labels         __dn_count_labels
 357 #define dn_skipname             __dn_skipname
 358 #define fp_resstat              __fp_resstat
 359 #define loc_aton                __loc_aton
 360 #define loc_ntoa                __loc_ntoa
 361 #define p_cdname                __p_cdname
 362 #define p_cdnname               __p_cdnname
 363 #define p_class                 __p_class
 364 #define p_fqname                __p_fqname
 365 #define p_fqnname               __p_fqnname
 366 #define p_option                __p_option
 367 #define p_secstodate            __p_secstodate
 368 #define p_section               __p_section
 369 #define p_time                  __p_time
 370 #define p_type                  __p_type
 371 #define p_rcode                 __p_rcode
 372 #define p_sockun                __p_sockun
 373 #define putlong                 __putlong
 374 #define putshort                __putshort
 375 #define res_check               __res_check
 376 #define res_dnok                __res_dnok
 377 #define res_findzonecut         __res_findzonecut
 378 #define res_findzonecut2        __res_findzonecut2
 379 #define res_hnok                __res_hnok
 380 #define res_hostalias           __res_hostalias
 381 #define res_mailok              __res_mailok
 382 #define res_nameinquery         __res_nameinquery
 383 #define res_nclose              __res_nclose
 384 #define res_ninit               __res_ninit
 385 #define res_nmkquery            __res_nmkquery
 386 #define res_pquery              __res_pquery
 387 #define res_nquery              __res_nquery
 388 #define res_nquerydomain        __res_nquerydomain
 389 #define res_nsearch             __res_nsearch
 390 #define res_nsend               __res_nsend
 391 #define res_nsendsigned         __res_nsendsigned
 392 #define res_nisourserver        __res_nisourserver
 393 #define res_ownok               __res_ownok
 394 #define res_queriesmatch        __res_queriesmatch
 395 #define res_rndinit             __res_rndinit
 396 #define res_randomid            __res_randomid
 397 #define res_nrandomid           __res_nrandomid
 398 #define sym_ntop                __sym_ntop
 399 #define sym_ntos                __sym_ntos
 400 #define sym_ston                __sym_ston
 401 #define res_nopt                __res_nopt
 402 #define res_nopt_rdata          __res_nopt_rdata
 403 #define res_ndestroy            __res_ndestroy
 404 #define res_nametoclass         __res_nametoclass
 405 #define res_nametotype          __res_nametotype
 406 #define res_setservers          __res_setservers
 407 #define res_getservers          __res_getservers
 408 #define res_buildprotolist      __res_buildprotolist
 409 #define res_destroyprotolist    __res_destroyprotolist
 410 #define res_destroyservicelist  __res_destroyservicelist
 411 #define res_get_nibblesuffix    __res_get_nibblesuffix
 412 #define res_get_nibblesuffix2   __res_get_nibblesuffix2
 413 #define res_ourserver_p         __res_ourserver_p
 414 #define res_protocolname        __res_protocolname
 415 #define res_protocolnumber      __res_protocolnumber
 416 #define res_send_setqhook       __res_send_setqhook
 417 #define res_send_setrhook       __res_send_setrhook
 418 #define res_servicename         __res_servicename
 419 #define res_servicenumber       __res_servicenumber
 420 __BEGIN_DECLS
 421 int             res_hnok(const char *);
 422 int             res_ownok(const char *);
 423 int             res_mailok(const char *);
 424 struct timespec;
 425 int             res_check(res_state, struct timespec *);
 426 int             res_dnok(const char *);
 427 int             sym_ston(const struct res_sym *, const char *, int *);
 428 const char *    sym_ntos(const struct res_sym *, int, int *);
 429 const char *    sym_ntop(const struct res_sym *, int, int *);
 430 int             b64_ntop(u_char const *, size_t, char *, size_t);
 431 int             b64_pton(char const *, u_char *, size_t);
 432 int             loc_aton(const char *, u_char *);
 433 const char *    loc_ntoa(const u_char *, char *);
 434 int             dn_skipname(const u_char *, const u_char *);
 435 void            putlong(uint32_t, u_char *);
 436 void            putshort(uint16_t, u_char *);
 437 #ifndef __ultrix__
 438 uint16_t        _getshort(const u_char *);
 439 uint32_t        _getlong(const u_char *);
 440 #endif
 441 const char *    p_class(int);
 442 const char *    p_time(uint32_t);
 443 const char *    p_type(int);
 444 const char *    p_rcode(int);
 445 const char *    p_sockun(union res_sockaddr_union, char *, size_t);
 446 const u_char *  p_cdnname(const u_char *, const u_char *, int, FILE *);
 447 const u_char *  p_cdname(const u_char *, const u_char *, FILE *);
 448 const u_char *  p_fqnname(const u_char *, const u_char *,
 449                                int, char *, int);
 450 const u_char *  p_fqname(const u_char *, const u_char *, FILE *);
 451 const char *    p_option(u_long);
 452 char *          p_secstodate(u_long);
 453 int             dn_count_labels(const char *);
 454 int             dn_comp(const char *, u_char *, int, u_char **, u_char **);
 455 int             dn_expand(const u_char *, const u_char *, const u_char *,
 456                                char *, int);
 457 void            res_rndinit(res_state);
 458 u_int           res_randomid(void);
 459 u_int           res_nrandomid(res_state);
 460 int             res_nameinquery(const char *, int, int, const u_char *,
 461                                      const u_char *);
 462 int             res_queriesmatch(const u_char *, const u_char *,
 463                                       const u_char *, const u_char *);
 464 const char *    p_section(int, int);
 465 /* Things involving a resolver context. */
 466 int             res_ninit(res_state);
 467 int             res_nisourserver(const res_state, const struct sockaddr_in *);
 468 void            fp_resstat(const res_state, FILE *);
 469 void            res_pquery(const res_state, const u_char *, int, FILE *);
 470 const char *    res_hostalias(const res_state, const char *, char *, size_t);
 471 int             res_nquery(res_state, const char *, int, int, u_char *, int);
 472 int             res_nsearch(res_state, const char *, int, int, u_char *, int);
 473 int             res_nquerydomain(res_state, const char *, const char *,
 474                                       int, int, u_char *, int);
 475 int             res_nmkquery(res_state, int, const char *, int, int,
 476                                   const u_char *, int, const u_char *,
 477                                   u_char *, int);
 478 int             res_nsend(res_state, const u_char *, int, u_char *, int);
 479 int             res_nsendsigned(res_state, const u_char *, int,
 480                                      ns_tsig_key *, u_char *, int);
 481 int             res_findzonecut(res_state, const char *, ns_class, int,
 482                                      char *, size_t, struct in_addr *, int);
 483 int             res_findzonecut2(res_state, const char *, ns_class, int,
 484                                       char *, size_t,
 485                                       union res_sockaddr_union *, int);
 486 void            res_nclose(res_state);
 487 int             res_nopt(res_state, int, u_char *, int, int);
 488 int             res_nopt_rdata(res_state, int, u_char *, int, u_char *,
 489                                     u_short, u_short, u_char *);
 490 void            res_send_setqhook(res_send_qhook);
 491 void            res_send_setrhook(res_send_rhook);
 492 int             __res_vinit(res_state, int);
 493 void            res_destroyservicelist(void);
 494 const char *    res_servicename(uint16_t, const char *);
 495 const char *    res_protocolname(int);
 496 void            res_destroyprotolist(void);
 497 void            res_buildprotolist(void);
 498 const char *    res_get_nibblesuffix(res_state);
 499 const char *    res_get_nibblesuffix2(res_state);
 500 void            res_ndestroy(res_state);
 501 uint16_t        res_nametoclass(const char *, int *);
 502 uint16_t        res_nametotype(const char *, int *);
 503 void            res_setservers(res_state,
 504                                     const union res_sockaddr_union *, int);
 505 int             res_getservers(res_state,
 506                                     union res_sockaddr_union *, int);
 507 __END_DECLS
 508
 509 #endif /* !_RESOLV_H_ */