headers/posix/resolv.h

   1 /*
   2  * Copyright 2009-2012 Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6 /*
   7  * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
   8  * Portions Copyright (C) 1995-2003  Internet Software Consortium.
   9  *
  10  * Permission to use, copy, modify, and/or distribute this software for any
  11  * purpose with or without fee is hereby granted, provided that the above
  12  * copyright notice and this permission notice appear in all copies.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  15  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  16  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  17  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  18  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  19  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  20  * PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 /*
  24  * Copyright (c) 1983, 1987, 1989
  25  *    The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56 #ifndef _RESOLV_H_
  57 #define _RESOLV_H_
  58
  59 #include <arpa/nameser.h>
  60 #include <netinet/in.h>
  61 #include <netinet6/in6.h>
  62 #include <stdio.h>
  63 #include <sys/param.h>
  64 #include <sys/types.h>
  65 #include <sys/cdefs.h>
  66 #include <sys/socket.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 *res, int err);
 101 __END_DECLS
 102
 103
 104 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
 105         res_sendhookact;
 106
 107 #ifndef __PMT
 108 #if defined(__STDC__) || defined(__cplusplus)
 109 #define __PMT(args) args
 110 #else
 111 #define __PMT(args) ()
 112 #endif
 113 #endif
 114
 115 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
 116         const u_char **, int *, u_char *, int, int *);
 117
 118 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
 119         const u_char *, int, u_char *, int, int *);
 120
 121 struct res_sym {
 122         int                     number;    /* Identifying number, like T_MX */
 123         const char *name;          /* Its symbolic name, like "MX" */
 124         const char *humanname; /* Its fun name, like "mail exchanger" */
 125 };
 126
 127 /*
 128  * Global defines and variables for resolver stub.
 129  */
 130 #define MAXNS                           3       /* max # name servers we'll track */
 131 #define MAXDFLSRCH                      3       /* # default domain levels to try */
 132 #define MAXDNSRCH                       6       /* max # domains in search path */
 133 #define LOCALDOMAINPARTS        2       /* min levels in name that is "local" */
 134 #define RES_TIMEOUT                     5       /* min. seconds between retries */
 135 #define MAXRESOLVSORT           10      /* number of net to sort on */
 136 #define RES_MAXNDOTS            15      /* should reflect bit field size */
 137 #define RES_MAXRETRANS          30      /* only for resolv.conf/RES_OPTIONS */
 138 #define RES_MAXRETRY            5       /* only for resolv.conf/RES_OPTIONS */
 139 #define RES_DFLRETRY            2       /* Default #/tries. */
 140 #define RES_MAXTIME                     65535   /* Infinity, in milliseconds. */
 141 struct __res_state_ext;
 142
 143 struct __res_state {
 144         int     retrans;                        /* retransmission time interval */
 145         int     retry;                          /* number of times to retransmit */
 146 #ifdef sun
 147         u_int   options;                /* option flags - see below. */
 148 #else
 149         u_long  options;                /* option flags - see below. */
 150 #endif
 151         int     nscount;                        /* number of name servers */
 152         struct sockaddr_in
 153                 nsaddr_list[MAXNS];     /* address of name server */
 154 #define nsaddr  nsaddr_list[0]          /* for backward compatibility */
 155         u_short id;                             /* current message id */
 156         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
 157         char    defdname[256];  /* default domain (deprecated) */
 158 #ifdef sun
 159         u_int   pfcode;                 /* RES_PRF_ flags - see below. */
 160 #else
 161         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
 162 #endif
 163         unsigned ndots:4;               /* threshold for initial abs. query */
 164         unsigned nsort:4;               /* number of elements in sort_list[] */
 165         char    unused[3];
 166         struct {
 167                 struct in_addr  addr;
 168                 u_int32_t       mask;
 169         } sort_list[MAXRESOLVSORT];
 170         res_send_qhook qhook;   /* query hook */
 171         res_send_rhook rhook;   /* response hook */
 172         int     res_h_errno;            /* last one set for this context */
 173         int     _vcsock;                        /* PRIVATE: for res_send VC i/o */
 174         u_int   _flags;                 /* PRIVATE: see below */
 175         u_char  _rnd[16];               /* PRIVATE: random state */
 176         u_int   _pad;                   /* make _u 64 bit aligned */
 177         union {
 178                 /* On an 32-bit arch this means 512b total. */
 179                 char    pad[56 - 4*sizeof (int) - 2*sizeof (void *)];
 180                 struct {
 181                         u_int16_t               nscount;
 182                         u_int16_t               nstimes[MAXNS]; /* ms. */
 183                         int                     nssocks[MAXNS];
 184                         struct __res_state_ext *ext;    /* extention for IPv6 */
 185                 } _ext;
 186         } _u;
 187 };
 188
 189 typedef struct __res_state *res_state;
 190
 191 union res_sockaddr_union {
 192         struct sockaddr_in      sin;
 193         struct sockaddr_in6     sin6;
 194 #ifdef ISC_ALIGN64
 195         int64_t                 __align64;              /* 64bit alignment */
 196 #else
 197         int32_t                 __align32;              /* 32bit alignment */
 198 #endif
 199         char                    __space[128];   /* max size */
 200 };
 201
 202 /*
 203  * Resolver flags (used to be discrete per-module statics ints).
 204  */
 205 #define RES_F_VC                0x00000001      /* socket is TCP */
 206 #define RES_F_CONN              0x00000002      /* socket is connected */
 207 #define RES_F_EDNS0ERR  0x00000004      /* EDNS0 caused errors */
 208 #define RES_F__UNUSED   0x00000008      /* (unused) */
 209 #define RES_F_LASTMASK  0x000000F0      /* ordinal server of last res_nsend */
 210 #define RES_F_LASTSHIFT 4                       /* bit position of LASTMASK "flag" */
 211 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 212
 213 /* res_findzonecut2() options */
 214 #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
 215 #define RES_IPV4ONLY    0x00000002      /* IPv4 only */
 216 #define RES_IPV6ONLY    0x00000004      /* IPv6 only */
 217
 218 /*
 219  * Resolver options (keep these in synch with res_debug.c, please)
 220  */
 221 #define RES_INIT                0x00000001      /* address initialized */
 222 #define RES_DEBUG               0x00000002      /* print debug messages */
 223 #define RES_AAONLY              0x00000004      /* authoritative answers only (!IMPL)*/
 224 #define RES_USEVC               0x00000008      /* use virtual circuit */
 225 #define RES_PRIMARY             0x00000010      /* query primary server only (!IMPL) */
 226 #define RES_IGNTC               0x00000020      /* ignore trucation errors */
 227 #define RES_RECURSE             0x00000040      /* recursion desired */
 228 #define RES_DEFNAMES    0x00000080      /* use default domain name */
 229 #define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */
 230 #define RES_DNSRCH              0x00000200      /* search up local domain tree */
 231 #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
 232 #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
 233 #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
 234 #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
 235 #define RES_ROTATE              0x00004000      /* rotate ns list after each query */
 236 #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 237 #define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
 238 #define RES_BLAST               0x00020000      /* blast all recursive servers */
 239 #define RES_NSID                0x00040000      /* request name server ID */
 240 #define RES_NOTLDQUERY  0x00100000      /* don't unqualified name as a tld */
 241 #define RES_USE_DNSSEC  0x00200000      /* use DNSSEC using OK bit in OPT */
 242 /* #define RES_DEBUG2   0x00400000 */   /* nslookup internal */
 243 #define RES_USE_INET4   0x00800000      /* use IPv4 in gethostbyname() */
 244 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 245 #define RES_USE_DNAME   0x10000000      /* use DNAME */
 246 #define RES_USE_EDNS0   0x40000000      /* use EDNS0 if configured */
 247 #define RES_NO_NIBBLE2  0x80000000      /* disable alternate nibble lookup */
 248
 249 #define RES_DEFAULT     \
 250         (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH | RES_NO_NIBBLE2)
 251
 252 /*
 253  * Resolver "pfcode" values.  Used by dig.
 254  */
 255 #define RES_PRF_STATS   0x00000001
 256 #define RES_PRF_UPDATE  0x00000002
 257 #define RES_PRF_CLASS   0x00000004
 258 #define RES_PRF_CMD             0x00000008
 259 #define RES_PRF_QUES    0x00000010
 260 #define RES_PRF_ANS             0x00000020
 261 #define RES_PRF_AUTH    0x00000040
 262 #define RES_PRF_ADD             0x00000080
 263 #define RES_PRF_HEAD1   0x00000100
 264 #define RES_PRF_HEAD2   0x00000200
 265 #define RES_PRF_TTLID   0x00000400
 266 #define RES_PRF_HEADX   0x00000800
 267 #define RES_PRF_QUERY   0x00001000
 268 #define RES_PRF_REPLY   0x00002000
 269 #define RES_PRF_INIT    0x00004000
 270 #define RES_PRF_TRUNC   0x00008000
 271 /*                      0x00010000      */
 272
 273 /* Things involving an internal (static) resolver context. */
 274 __BEGIN_DECLS
 275 extern struct __res_state *__res_get_state(void);
 276 extern void __res_put_state(struct __res_state *);
 277
 278 /*
 279  * Source and Binary compatibility; _res will not work properly
 280  * with multi-threaded programs.
 281  */
 282 extern struct __res_state *__res_state(void);
 283 #define _res (*__res_state())
 284 __END_DECLS
 285
 286 #ifndef __BIND_NOSTATIC
 287 #define fp_nquery               __fp_nquery
 288 #define fp_query                __fp_query
 289 #define hostalias               __hostalias
 290 #define p_query                 __p_query
 291 #define res_close               __res_close
 292 #define res_init                __res_init
 293 #define res_isourserver __res_isourserver
 294 #define res_mkquery             __res_mkquery
 295 #define res_query               __res_query
 296 #define res_querydomain __res_querydomain
 297 #define res_search              __res_search
 298 #define res_send                __res_send
 299 #define res_sendsigned  __res_sendsigned
 300
 301 __BEGIN_DECLS
 302 void            fp_nquery(const u_char *, int, FILE *);
 303 void            fp_query(const u_char *, FILE *);
 304 const char *hostalias(const char *);
 305 void            p_query(const u_char *);
 306 void            res_close(void);
 307 int                     res_init(void);
 308 int                     res_isourserver(const struct sockaddr_in *);
 309 int                     res_mkquery(int, const char *, int, int, const u_char *,
 310                                  int, const u_char *, u_char *, int);
 311 int                     res_query(const char *, int, int, u_char *, int);
 312 int                     res_querydomain(const char *, const char *, int, int,
 313                                 u_char *, int);
 314 int                     res_search(const char *, int, int, u_char *, int);
 315 int                     res_send(const u_char *, int, u_char *, int);
 316 int                     res_sendsigned(const u_char *, int, ns_tsig_key *,
 317                                 u_char *, int);
 318 __END_DECLS
 319 #endif
 320
 321 #if !defined(SHARED_LIBBIND) || defined(LIB)
 322 /*
 323  * If libbind is a shared object (well, DLL anyway)
 324  * these externs break the linker when resolv.h is
 325  * included by a lib client (like named)
 326  * Make them go away if a client is including this
 327  *
 328  */
 329 extern const struct res_sym __p_key_syms[];
 330 extern const struct res_sym __p_cert_syms[];
 331 extern const struct res_sym __p_class_syms[];
 332 extern const struct res_sym __p_type_syms[];
 333 extern const struct res_sym __p_rcode_syms[];
 334 #endif /* SHARED_LIBBIND */
 335
 336 #define b64_ntop                        __b64_ntop
 337 #define b64_pton                        __b64_pton
 338 #define dn_comp                         __dn_comp
 339 #define dn_count_labels         __dn_count_labels
 340 #define dn_expand                       __dn_expand
 341 #define dn_skipname                     __dn_skipname
 342 #define fp_resstat                      __fp_resstat
 343 #define loc_aton                        __loc_aton
 344 #define loc_ntoa                        __loc_ntoa
 345 #define p_cdname                        __p_cdname
 346 #define p_cdnname                       __p_cdnname
 347 #define p_class                         __p_class
 348 #define p_fqname                        __p_fqname
 349 #define p_fqnname                       __p_fqnname
 350 #define p_option                        __p_option
 351 #define p_secstodate            __p_secstodate
 352 #define p_section                       __p_section
 353 #define p_time                          __p_time
 354 #define p_type                          __p_type
 355 #define p_rcode                         __p_rcode
 356 #define p_sockun                        __p_sockun
 357 #define putlong                         __putlong
 358 #define putshort                        __putshort
 359 #define res_dnok                        __res_dnok
 360 #define res_findzonecut         __res_findzonecut
 361 #define res_findzonecut2        __res_findzonecut2
 362 #define res_hnok                        __res_hnok
 363 #define res_hostalias           __res_hostalias
 364 #define res_mailok                      __res_mailok
 365 #define res_nameinquery         __res_nameinquery
 366 #define res_nclose                      __res_nclose
 367 #define res_ninit                       __res_ninit
 368 #define res_nmkquery            __res_nmkquery
 369 #define res_pquery                      __res_pquery
 370 #define res_nquery                      __res_nquery
 371 #define res_nquerydomain        __res_nquerydomain
 372 #define res_nsearch                     __res_nsearch
 373 #define res_nsend                       __res_nsend
 374 #define res_nsendsigned         __res_nsendsigned
 375 #define res_nisourserver        __res_nisourserver
 376 #define res_ownok                       __res_ownok
 377 #define res_queriesmatch        __res_queriesmatch
 378 #define res_rndinit                     __res_rndinit
 379 #define res_randomid            __res_randomid
 380 #define res_nrandomid           __res_nrandomid
 381 #define sym_ntop                        __sym_ntop
 382 #define sym_ntos                        __sym_ntos
 383 #define sym_ston                        __sym_ston
 384 #define res_nopt                        __res_nopt
 385 #define res_nopt_rdata          __res_nopt_rdata
 386 #define res_ndestroy            __res_ndestroy
 387 #define res_nametoclass         __res_nametoclass
 388 #define res_nametotype          __res_nametotype
 389 #define res_setservers          __res_setservers
 390 #define res_getservers          __res_getservers
 391 #define res_buildprotolist      __res_buildprotolist
 392 #define res_destroyprotolist    __res_destroyprotolist
 393 #define res_destroyservicelist  __res_destroyservicelist
 394 #define res_get_nibblesuffix    __res_get_nibblesuffix
 395 #define res_get_nibblesuffix2   __res_get_nibblesuffix2
 396 #define res_ourserver_p         __res_ourserver_p
 397 #define res_protocolname        __res_protocolname
 398 #define res_protocolnumber      __res_protocolnumber
 399 #define res_send_setqhook       __res_send_setqhook
 400 #define res_send_setrhook       __res_send_setrhook
 401 #define res_servicename         __res_servicename
 402 #define res_servicenumber       __res_servicenumber
 403
 404 __BEGIN_DECLS
 405 int                             res_hnok(const char *);
 406 int                             res_ownok(const char *);
 407 int                             res_mailok(const char *);
 408 int                             res_dnok(const char *);
 409 int                             sym_ston(const struct res_sym *, const char *, int *);
 410 const char *    sym_ntos(const struct res_sym *, int, int *);
 411 const char *    sym_ntop(const struct res_sym *, int, int *);
 412 int                             b64_ntop(u_char const *, size_t, char *, size_t);
 413 int                             b64_pton(char const *, u_char *, size_t);
 414 int                             loc_aton(const char *, u_char *);
 415 const char *    loc_ntoa(const u_char *, char *);
 416 int                             dn_skipname(const u_char *, const u_char *);
 417 void                    putlong(u_int32_t, u_char *);
 418 void                    putshort(u_int16_t, u_char *);
 419 #if !defined(__ultrix__)
 420 u_int16_t               _getshort(const u_char *);
 421 u_int32_t               _getlong(const u_char *);
 422 #endif
 423 const char *    p_class(int);
 424 const char *    p_time(u_int32_t);
 425 const char *    p_type(int);
 426 const char *    p_rcode(int);
 427 const char *    p_sockun(union res_sockaddr_union, char *, size_t);
 428 const u_char *  p_cdnname(const u_char *, const u_char *, int, FILE *);
 429 const u_char *  p_cdname(const u_char *, const u_char *, FILE *);
 430 const u_char *  p_fqnname(const u_char *, const u_char *, int, char *, int);
 431 const u_char *  p_fqname(const u_char *, const u_char *, FILE *);
 432 const char *    p_option(u_long);
 433 char *                  p_secstodate(u_long);
 434 int                             dn_count_labels(const char *);
 435 int                             dn_comp(const char *, u_char *, int, u_char **, u_char **);
 436 int                             dn_expand(const u_char *, const u_char *, const u_char *,
 437                                         char *, int);
 438 void                    res_rndinit(res_state);
 439 u_int                   res_randomid(void);
 440 u_int                   res_nrandomid(res_state);
 441 int                             res_nameinquery(const char *, int, int, const u_char *,
 442                                         const u_char *);
 443 int                             res_queriesmatch(const u_char *, const u_char *, const u_char *,
 444                                         const u_char *);
 445 const char *    p_section(int, int);
 446 /* Things involving a resolver context. */
 447 int                             res_ninit(res_state);
 448 int                             res_nisourserver(const res_state, const struct sockaddr_in *);
 449 void                    fp_resstat(const res_state, FILE *);
 450 void                    res_pquery(const res_state, const u_char *, int, FILE *);
 451 const char *    res_hostalias(const res_state, const char *, char *, size_t);
 452 int                             res_nquery(res_state, const char *, int, int, u_char *, int);
 453 int                             res_nsearch(res_state, const char *, int, int, u_char *, int);
 454 int                             res_nquerydomain(res_state, const char *, const char *, int,
 455                                         int, u_char *, int);
 456 int                             res_nmkquery(res_state, int, const char *, int, int,
 457                                         const u_char *, int, const u_char *, u_char *, int);
 458 int                             res_nsend(res_state, const u_char *, int, u_char *, int);
 459 int                             res_nsendsigned(res_state, const u_char *, int, ns_tsig_key *,
 460                                         u_char *, int);
 461 int                             res_findzonecut(res_state, const char *, ns_class, int, char *,
 462                                         size_t, struct in_addr *, int);
 463 int                             res_findzonecut2(res_state, const char *, ns_class, int, char *,
 464                                         size_t, union res_sockaddr_union *, int);
 465 void                    res_nclose(res_state);
 466 int                             res_nopt(res_state, int, u_char *, int, int);
 467 int                             res_nopt_rdata(res_state, int, u_char *, int, u_char *, u_short,
 468                                         u_short, u_char *);
 469 void                    res_send_setqhook(res_send_qhook);
 470 void                    res_send_setrhook(res_send_rhook);
 471 int                             __res_vinit(res_state, int);
 472 void                    res_destroyservicelist(void);
 473 const char *    res_servicename(u_int16_t, const char *);
 474 const char *    res_protocolname(int);
 475 void                    res_destroyprotolist(void);
 476 void                    res_buildprotolist(void);
 477 const char *    res_get_nibblesuffix(res_state);
 478 const char *    res_get_nibblesuffix2(res_state);
 479 void                    res_ndestroy(res_state);
 480 u_int16_t               res_nametoclass(const char *, int *);
 481 u_int16_t               res_nametotype(const char *, int *);
 482 void                    res_setservers(res_state, const union res_sockaddr_union *,
 483                                         int);
 484 int                             res_getservers(res_state, union res_sockaddr_union *, int);
 485 __END_DECLS
 486
 487 #endif /* !_RESOLV_H_ */