include/resolv.h

   1 /*      $NetBSD: resolv.h,v 1.34 2008/06/21 20:12:49 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1983, 1987, 1989
   5  *    The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  34  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  35  *
  36  * Permission to use, copy, modify, and distribute this software for any
  37  * purpose with or without fee is hereby granted, provided that the above
  38  * copyright notice and this permission notice appear in all copies.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  41  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  42  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  43  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  44  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  45  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  46  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  47  */
  48
  49 /*%
  50  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
  51  *      Id: resolv.h,v 1.23.564.1 2008/04/03 02:12:21 marka 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   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
 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[72 - 4*sizeof (int) - 2*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 #endif
 194 };
 195
 196 typedef struct __res_state *res_state;
 197
 198 union res_sockaddr_union {
 199         struct sockaddr_in      sin;
 200 #ifdef IN6ADDR_ANY_INIT
 201         struct sockaddr_in6     sin6;
 202 #endif
 203 #ifdef ISC_ALIGN64
 204         int64_t                 __align64;      /*%< 64bit alignment */
 205 #else
 206         int32_t                 __align32;      /*%< 32bit alignment */
 207 #endif
 208         char                    __space[128];   /* max size */
 209 };
 210
 211 /*%
 212  * Resolver flags (used to be discrete per-module statics ints).
 213  */
 214 #define RES_F_VC        0x00000001      /*%< socket is TCP */
 215 #define RES_F_CONN      0x00000002      /*%< socket is connected */
 216 #define RES_F_EDNS0ERR  0x00000004      /*%< EDNS0 caused errors */
 217 #define RES_F__UNUSED   0x00000008      /*%< (unused) */
 218 #define RES_F_LASTMASK  0x000000F0      /*%< ordinal server of last res_nsend */
 219 #define RES_F_LASTSHIFT 4               /*%< bit position of LASTMASK "flag" */
 220 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 221
 222 /* res_findzonecut2() options */
 223 #define RES_EXHAUSTIVE  0x00000001      /*%< always do all queries */
 224 #define RES_IPV4ONLY    0x00000002      /*%< IPv4 only */
 225 #define RES_IPV6ONLY    0x00000004      /*%< IPv6 only */
 226
 227 /*%
 228  * Resolver options (keep these in synch with res_debug.c, please)
 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 #define RES_NSID        0x00040000      /*%< request name server ID */
 249 #define RES_NOTLDQUERY  0x00100000      /*%< don't unqualified name as a tld */
 250 #define RES_USE_DNSSEC  0x00200000      /*%< use DNSSEC using OK bit in OPT */
 251 /* #define RES_DEBUG2   0x00400000 */   /* nslookup internal */
 252 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 253 #define RES_USE_DNAME   0x10000000      /*%< use DNAME */
 254 #define RES_USE_EDNS0   0x40000000      /*%< use EDNS0 if configured */
 255 #define RES_NO_NIBBLE2  0x80000000      /*%< disable alternate nibble lookup */
 256
 257 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | \
 258                          RES_DNSRCH | RES_NO_NIBBLE2)
 259
 260 /*%
 261  * Resolver "pfcode" values.  Used by dig.
 262  */
 263 #define RES_PRF_STATS   0x00000001
 264 #define RES_PRF_UPDATE  0x00000002
 265 #define RES_PRF_CLASS   0x00000004
 266 #define RES_PRF_CMD     0x00000008
 267 #define RES_PRF_QUES    0x00000010
 268 #define RES_PRF_ANS     0x00000020
 269 #define RES_PRF_AUTH    0x00000040
 270 #define RES_PRF_ADD     0x00000080
 271 #define RES_PRF_HEAD1   0x00000100
 272 #define RES_PRF_HEAD2   0x00000200
 273 #define RES_PRF_TTLID   0x00000400
 274 #define RES_PRF_HEADX   0x00000800
 275 #define RES_PRF_QUERY   0x00001000
 276 #define RES_PRF_REPLY   0x00002000
 277 #define RES_PRF_INIT    0x00004000
 278 #define RES_PRF_TRUNC   0x00008000
 279 /*                      0x00010000      */
 280
 281 /* Things involving an internal (static) resolver context. */
 282 __BEGIN_DECLS
 283 extern struct __res_state *__res_get_state(void);
 284 extern void __res_put_state(struct __res_state *);
 285
 286 /*
 287  * Source and Binary compatibility; _res will not work properly
 288  * with multi-threaded programs.
 289  */
 290 extern struct __res_state *__res_state(void);
 291 #define _res (*__res_state())
 292
 293 __END_DECLS
 294
 295 #ifndef __BIND_NOSTATIC
 296 #define fp_nquery               __fp_nquery
 297 #define fp_query                __fp_query
 298 #define hostalias               __hostalias
 299 #define p_query                 __p_query
 300 #define res_close               __res_close
 301 #define res_isourserver         __res_isourserver
 302 #define res_opt                 __res_opt
 303 #define res_querydomain         __res_querydomain
 304 #define res_send                __res_send
 305 #define res_sendsigned          __res_sendsigned
 306
 307 #ifdef notdef
 308 /* NetBSD protects these via weak symbols. */
 309 #define res_init                __res_init
 310 #define res_query               __res_query
 311 #define res_mkquery             __res_mkquery
 312 #define dn_expand               __dn_expand
 313 #define res_search              __res_search
 314 #endif
 315
 316 __BEGIN_DECLS
 317 void            fp_nquery(const u_char *, int, FILE *);
 318 void            fp_query(const u_char *, FILE *);
 319 const char *    hostalias(const char *);
 320 void            p_query(const u_char *);
 321 void            res_close(void);
 322 int             res_init(void);
 323 int             res_opt(int, u_char *, int, int);
 324 int             res_isourserver(const struct sockaddr_in *);
 325 int             res_mkquery(int, const char *, int, int, const u_char *,
 326                                  int, const u_char *, u_char *, int);
 327 int             res_query(const char *, int, int, u_char *, int);
 328 int             res_querydomain(const char *, const char *, int, int,
 329                                      u_char *, int);
 330 int             res_search(const char *, int, int, u_char *, int);
 331 int             res_send(const u_char *, int, u_char *, int);
 332 int             res_sendsigned(const u_char *, int, ns_tsig_key *,
 333                                     u_char *, int);
 334 __END_DECLS
 335 #endif
 336
 337 #if !defined(SHARED_LIBBIND) || defined(LIB)
 338 /*
 339  * If libbind is a shared object (well, DLL anyway)
 340  * these externs break the linker when resolv.h is
 341  * included by a lib client (like named)
 342  * Make them go away if a client is including this
 343  *
 344  */
 345 extern const struct res_sym __p_key_syms[];
 346 extern const struct res_sym __p_cert_syms[];
 347 extern const struct res_sym __p_class_syms[];
 348 extern const struct res_sym __p_type_syms[];
 349 extern const struct res_sym __p_rcode_syms[];
 350 #endif /* SHARED_LIBBIND */
 351
 352 #define b64_ntop                __b64_ntop
 353 #define b64_pton                __b64_pton
 354 #define dn_comp                 __dn_comp
 355 #define dn_count_labels         __dn_count_labels
 356 #define dn_skipname             __dn_skipname
 357 #define fp_resstat              __fp_resstat
 358 #define loc_aton                __loc_aton
 359 #define loc_ntoa                __loc_ntoa
 360 #define p_cdname                __p_cdname
 361 #define p_cdnname               __p_cdnname
 362 #define p_class                 __p_class
 363 #define p_fqname                __p_fqname
 364 #define p_fqnname               __p_fqnname
 365 #define p_option                __p_option
 366 #define p_secstodate            __p_secstodate
 367 #define p_section               __p_section
 368 #define p_time                  __p_time
 369 #define p_type                  __p_type
 370 #define p_rcode                 __p_rcode
 371 #define p_sockun                __p_sockun
 372 #define putlong                 __putlong
 373 #define putshort                __putshort
 374 #define res_dnok                __res_dnok
 375 #define res_findzonecut         __res_findzonecut
 376 #define res_findzonecut2        __res_findzonecut2
 377 #define res_hnok                __res_hnok
 378 #define res_hostalias           __res_hostalias
 379 #define res_mailok              __res_mailok
 380 #define res_nameinquery         __res_nameinquery
 381 #define res_nclose              __res_nclose
 382 #define res_ninit               __res_ninit
 383 #define res_nmkquery            __res_nmkquery
 384 #define res_pquery              __res_pquery
 385 #define res_nquery              __res_nquery
 386 #define res_nquerydomain        __res_nquerydomain
 387 #define res_nsearch             __res_nsearch
 388 #define res_nsend               __res_nsend
 389 #define res_nsendsigned         __res_nsendsigned
 390 #define res_nisourserver        __res_nisourserver
 391 #define res_ownok               __res_ownok
 392 #define res_queriesmatch        __res_queriesmatch
 393 #define res_randomid            __res_randomid
 394 #define sym_ntop                __sym_ntop
 395 #define sym_ntos                __sym_ntos
 396 #define sym_ston                __sym_ston
 397 #define res_nopt                __res_nopt
 398 #define res_nopt_rdata          __res_nopt_rdata
 399 #define res_ndestroy            __res_ndestroy
 400 #define res_nametoclass         __res_nametoclass
 401 #define res_nametotype          __res_nametotype
 402 #define res_setservers          __res_setservers
 403 #define res_getservers          __res_getservers
 404 #define res_buildprotolist      __res_buildprotolist
 405 #define res_destroyprotolist    __res_destroyprotolist
 406 #define res_destroyservicelist  __res_destroyservicelist
 407 #define res_get_nibblesuffix    __res_get_nibblesuffix
 408 #define res_get_nibblesuffix2   __res_get_nibblesuffix2
 409 #define res_ourserver_p         __res_ourserver_p
 410 #define res_protocolname        __res_protocolname
 411 #define res_protocolnumber      __res_protocolnumber
 412 #define res_send_setqhook       __res_send_setqhook
 413 #define res_send_setrhook       __res_send_setrhook
 414 #define res_servicename         __res_servicename
 415 #define res_servicenumber       __res_servicenumber
 416 __BEGIN_DECLS
 417 int             res_hnok(const char *);
 418 int             res_ownok(const char *);
 419 int             res_mailok(const char *);
 420 int             res_dnok(const char *);
 421 int             sym_ston(const struct res_sym *, const char *, int *);
 422 const char *    sym_ntos(const struct res_sym *, int, int *);
 423 const char *    sym_ntop(const struct res_sym *, int, int *);
 424 int             b64_ntop(u_char const *, size_t, char *, size_t);
 425 int             b64_pton(char const *, u_char *, size_t);
 426 int             loc_aton(const char *, u_char *);
 427 const char *    loc_ntoa(const u_char *, char *);
 428 int             dn_skipname(const u_char *, const u_char *);
 429 void            putlong(uint32_t, u_char *);
 430 void            putshort(uint16_t, u_char *);
 431 #ifndef __ultrix__
 432 uint16_t        _getshort(const u_char *);
 433 uint32_t        _getlong(const u_char *);
 434 #endif
 435 const char *    p_class(int);
 436 const char *    p_time(uint32_t);
 437 const char *    p_type(int);
 438 const char *    p_rcode(int);
 439 const char *    p_sockun(union res_sockaddr_union, char *, size_t);
 440 const u_char *  p_cdnname(const u_char *, const u_char *, int, FILE *);
 441 const u_char *  p_cdname(const u_char *, const u_char *, FILE *);
 442 const u_char *  p_fqnname(const u_char *, const u_char *,
 443                                int, char *, int);
 444 const u_char *  p_fqname(const u_char *, const u_char *, FILE *);
 445 const char *    p_option(u_long);
 446 char *          p_secstodate(u_long);
 447 int             dn_count_labels(const char *);
 448 int             dn_comp(const char *, u_char *, int, u_char **, u_char **);
 449 int             dn_expand(const u_char *, const u_char *, const u_char *,
 450                                char *, int);
 451 u_int           res_randomid(void);
 452 int             res_nameinquery(const char *, int, int, const u_char *,
 453                                      const u_char *);
 454 int             res_queriesmatch(const u_char *, const u_char *,
 455                                       const u_char *, const u_char *);
 456 const char *    p_section(int, int);
 457 /* Things involving a resolver context. */
 458 int             res_ninit(res_state);
 459 int             res_nisourserver(const res_state, const struct sockaddr_in *);
 460 void            fp_resstat(const res_state, FILE *);
 461 void            res_pquery(const res_state, const u_char *, int, FILE *);
 462 const char *    res_hostalias(const res_state, const char *, char *, size_t);
 463 int             res_nquery(res_state, const char *, int, int, u_char *, int);
 464 int             res_nsearch(res_state, const char *, int, int, u_char *, int);
 465 int             res_nquerydomain(res_state, const char *, const char *,
 466                                       int, int, u_char *, int);
 467 int             res_nmkquery(res_state, int, const char *, int, int,
 468                                   const u_char *, int, const u_char *,
 469                                   u_char *, int);
 470 int             res_nsend(res_state, const u_char *, int, u_char *, int);
 471 int             res_nsendsigned(res_state, const u_char *, int,
 472                                      ns_tsig_key *, u_char *, int);
 473 int             res_findzonecut(res_state, const char *, ns_class, int,
 474                                      char *, size_t, struct in_addr *, int);
 475 int             res_findzonecut2(res_state, const char *, ns_class, int,
 476                                       char *, size_t,
 477                                       union res_sockaddr_union *, int);
 478 void            res_nclose(res_state);
 479 int             res_nopt(res_state, int, u_char *, int, int);
 480 int             res_nopt_rdata(res_state, int, u_char *, int, u_char *,
 481                                     u_short, u_short, u_char *);
 482 void            res_send_setqhook(res_send_qhook);
 483 void            res_send_setrhook(res_send_rhook);
 484 int             __res_vinit(res_state, int);
 485 void            res_destroyservicelist(void);
 486 const char *    res_servicename(uint16_t, const char *);
 487 const char *    res_protocolname(int);
 488 void            res_destroyprotolist(void);
 489 void            res_buildprotolist(void);
 490 const char *    res_get_nibblesuffix(res_state);
 491 const char *    res_get_nibblesuffix2(res_state);
 492 void            res_ndestroy(res_state);
 493 uint16_t        res_nametoclass(const char *, int *);
 494 uint16_t        res_nametotype(const char *, int *);
 495 void            res_setservers(res_state,
 496                                     const union res_sockaddr_union *, int);
 497 int             res_getservers(res_state,
 498                                     union res_sockaddr_union *, int);
 499 __END_DECLS
 500
 501 #endif /* !_RESOLV_H_ */