include/resolv.h

   1 /*      $NetBSD: resolv.h,v 1.40 2012/11/07 15:45:24 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 <netinet/in.h>
  67 #include <arpa/nameser.h>
  68
  69 /*%
  70  * Revision information.  This is the release date in YYYYMMDD format.
  71  * It can change every day so the right thing to do with it is use it
  72  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  73  * compare for equality; rather, use it to determine whether your resolver
  74  * is new enough to contain a certain feature.
  75  */
  76
  77 #define __RES   20090302
  78
  79 /*%
  80  * This used to be defined in res_query.c, now it's in herror.c.
  81  * [XXX no it's not.  It's in irs/irs_data.c]
  82  * It was
  83  * never extern'd by any *.h file before it was placed here.  For thread
  84  * aware programs, the last h_errno value set is stored in res->h_errno.
  85  *
  86  * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
  87  *      (and __h_errno_set) to the public via <resolv.h>.
  88  * XXX: __h_errno_set is really part of IRS, not part of the resolver.
  89  *      If somebody wants to build and use a resolver that doesn't use IRS,
  90  *      what do they do?  Perhaps something like
  91  *              #ifdef WANT_IRS
  92  *              # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  93  *              #else
  94  *              # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
  95  *              #endif
  96  */
  97
  98 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  99 struct __res_state; /*%< forward */
 100 __BEGIN_DECLS
 101 void __h_errno_set(struct __res_state *, int);
 102 __END_DECLS
 103
 104 /*%
 105  * Resolver configuration file.
 106  * Normally not present, but may contain the address of the
 107  * initial name server(s) to query and the domain search list.
 108  */
 109
 110 #ifndef _PATH_RESCONF
 111 #define _PATH_RESCONF        "/etc/resolv.conf"
 112 #endif
 113
 114 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
 115         res_sendhookact;
 116
 117 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
 118                                               const u_char **, int *,
 119                                               u_char *, int, int *);
 120
 121 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
 122                                               const u_char *, int, u_char *,
 123                                               int, int *);
 124
 125 struct res_sym {
 126         int             number;    /*%< Identifying number, like T_MX */
 127         const char *    name;      /*%< Its symbolic name, like "MX" */
 128         const char *    humanname; /*%< Its fun name, like "mail exchanger" */
 129 };
 130
 131 /*%
 132  * Global defines and variables for resolver stub.
 133  */
 134 #define MAXNS                   3       /*%< max # name servers we'll track */
 135 #define MAXDFLSRCH              3       /*%< # default domain levels to try */
 136 #define MAXDNSRCH               6       /*%< max # domains in search path */
 137 #define LOCALDOMAINPARTS        2       /*%< min levels in name that is "local" */
 138 #define RES_TIMEOUT             5       /*%< min. seconds between retries */
 139 #define MAXRESOLVSORT           10      /*%< number of net to sort on */
 140 #define RES_MAXNDOTS            15      /*%< should reflect bit field size */
 141 #define RES_MAXRETRANS          30      /*%< only for resolv.conf/RES_OPTIONS */
 142 #define RES_MAXRETRY            5       /*%< only for resolv.conf/RES_OPTIONS */
 143 #define RES_DFLRETRY            2       /*%< Default #/tries. */
 144 #define RES_MAXTIME             65535   /*%< Infinity, in milliseconds. */
 145
 146 struct __res_state_ext;
 147
 148 struct __res_state {
 149         int     retrans;                /*%< retransmission time interval */
 150         int     retry;                  /*%< number of times to retransmit */
 151 #ifdef sun
 152         u_int   options;                /*%< option flags - see below. */
 153 #else
 154         u_long  options;                /*%< option flags - see below. */
 155 #endif
 156         int     nscount;                /*%< number of name servers */
 157         struct sockaddr_in
 158                 nsaddr_list[MAXNS];     /*%< address of name server */
 159 #define nsaddr  nsaddr_list[0]          /*%< for backward compatibility */
 160         u_short id;                     /*%< current message id */
 161         char    *dnsrch[MAXDNSRCH+1];   /*%< components of domain to search */
 162         char    defdname[256];          /*%< default domain (deprecated) */
 163 #ifdef sun
 164         u_int   pfcode;                 /*%< RES_PRF_ flags - see below. */
 165 #else
 166         u_long  pfcode;                 /*%< RES_PRF_ flags - see below. */
 167 #endif
 168         unsigned ndots:4;               /*%< threshold for initial abs. query */
 169         unsigned nsort:4;               /*%< number of elements in sort_list[] */
 170         char    unused[3];
 171         struct {
 172                 struct in_addr  addr;
 173                 uint32_t        mask;
 174         } sort_list[MAXRESOLVSORT];
 175 #ifdef __OLD_RES_STATE
 176         char lookups[4];
 177 #else
 178         res_send_qhook qhook;           /*%< query hook */
 179         res_send_rhook rhook;           /*%< response hook */
 180         int     res_h_errno;            /*%< last one set for this context */
 181         int     _vcsock;                /*%< PRIVATE: for res_send VC i/o */
 182         u_int   _flags;                 /*%< PRIVATE: see below */
 183         u_int   _pad;                   /*%< make _u 64 bit aligned */
 184         union {
 185                 /* On an 32-bit arch this means 512b total. */
 186                 char    pad[56 - 4*sizeof (int) - 3*sizeof (void *)];
 187                 struct {
 188                         uint16_t                nscount;
 189                         uint16_t                nstimes[MAXNS]; /*%< ms. */
 190                         int                     nssocks[MAXNS];
 191                         struct __res_state_ext *ext;    /*%< extention for IPv6 */
 192                 } _ext;
 193         } _u;
 194         u_char  *_rnd;                  /*%< PRIVATE: random state */
 195 #endif
 196 };
 197
 198 typedef struct __res_state *res_state;
 199
 200 union res_sockaddr_union {
 201         struct sockaddr_in      sin;
 202 #ifdef IN6ADDR_ANY_INIT
 203         struct sockaddr_in6     sin6;
 204 #endif
 205 #ifdef ISC_ALIGN64
 206         int64_t                 __align64;      /*%< 64bit alignment */
 207 #else
 208         int32_t                 __align32;      /*%< 32bit alignment */
 209 #endif
 210         char                    __space[128];   /* max size */
 211 };
 212
 213 /*%
 214  * Resolver flags (used to be discrete per-module statics ints).
 215  */
 216 #define RES_F_VC        0x00000001      /*%< socket is TCP */
 217 #define RES_F_CONN      0x00000002      /*%< socket is connected */
 218 #define RES_F_EDNS0ERR  0x00000004      /*%< EDNS0 caused errors */
 219 #define RES_F__UNUSED   0x00000008      /*%< (unused) */
 220 #define RES_F_LASTMASK  0x000000F0      /*%< ordinal server of last res_nsend */
 221 #define RES_F_LASTSHIFT 4               /*%< bit position of LASTMASK "flag" */
 222 #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 223
 224 /* res_findzonecut2() options */
 225 #define RES_EXHAUSTIVE  0x00000001      /*%< always do all queries */
 226 #define RES_IPV4ONLY    0x00000002      /*%< IPv4 only */
 227 #define RES_IPV6ONLY    0x00000004      /*%< IPv6 only */
 228
 229 /*%
 230  * Resolver options (keep these in synch with res_debug.c, please)
 231  */
 232 #define RES_INIT        0x00000001      /*%< address initialized */
 233 #define RES_DEBUG       0x00000002      /*%< print debug messages */
 234 #define RES_AAONLY      0x00000004      /*%< authoritative answers only (!IMPL)*/
 235 #define RES_USEVC       0x00000008      /*%< use virtual circuit */
 236 #define RES_PRIMARY     0x00000010      /*%< query primary server only (!IMPL) */
 237 #define RES_IGNTC       0x00000020      /*%< ignore trucation errors */
 238 #define RES_RECURSE     0x00000040      /*%< recursion desired */
 239 #define RES_DEFNAMES    0x00000080      /*%< use default domain name */
 240 #define RES_STAYOPEN    0x00000100      /*%< Keep TCP socket open */
 241 #define RES_DNSRCH      0x00000200      /*%< search up local domain tree */
 242 #define RES_INSECURE1   0x00000400      /*%< type 1 security disabled */
 243 #define RES_INSECURE2   0x00000800      /*%< type 2 security disabled */
 244 #define RES_NOALIASES   0x00001000      /*%< shuts off HOSTALIASES feature */
 245 #define RES_USE_INET6   0x00002000      /*%< use/map IPv6 in gethostbyname() */
 246 #define RES_ROTATE      0x00004000      /*%< rotate ns list after each query */
 247 #define RES_NOCHECKNAME 0x00008000      /*%< do not check names for sanity. */
 248 #define RES_KEEPTSIG    0x00010000      /*%< do not strip TSIG records */
 249 #define RES_BLAST       0x00020000      /*%< blast all recursive servers */
 250 #define RES_NSID        0x00040000      /*%< request name server ID */
 251 #define RES_NOTLDQUERY  0x00100000      /*%< don't unqualified name as a tld */
 252 #define RES_USE_DNSSEC  0x00200000      /*%< use DNSSEC using OK bit in OPT */
 253 /* #define RES_DEBUG2   0x00400000 */   /* nslookup internal */
 254 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 255 #define RES_USE_DNAME   0x10000000      /*%< use DNAME */
 256 #define RES_USE_EDNS0   0x40000000      /*%< use EDNS0 if configured */
 257 #define RES_NO_NIBBLE2  0x80000000      /*%< disable alternate nibble lookup */
 258
 259 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | \
 260                          RES_DNSRCH | RES_NO_NIBBLE2 | RES_NOCHECKNAME)
 261
 262 /*%
 263  * Resolver "pfcode" values.  Used by dig.
 264  */
 265 #define RES_PRF_STATS   0x00000001
 266 #define RES_PRF_UPDATE  0x00000002
 267 #define RES_PRF_CLASS   0x00000004
 268 #define RES_PRF_CMD     0x00000008
 269 #define RES_PRF_QUES    0x00000010
 270 #define RES_PRF_ANS     0x00000020
 271 #define RES_PRF_AUTH    0x00000040
 272 #define RES_PRF_ADD     0x00000080
 273 #define RES_PRF_HEAD1   0x00000100
 274 #define RES_PRF_HEAD2   0x00000200
 275 #define RES_PRF_TTLID   0x00000400
 276 #define RES_PRF_HEADX   0x00000800
 277 #define RES_PRF_QUERY   0x00001000
 278 #define RES_PRF_REPLY   0x00002000
 279 #define RES_PRF_INIT    0x00004000
 280 #define RES_PRF_TRUNC   0x00008000
 281 /*                      0x00010000      */
 282
 283 /* Things involving an internal (static) resolver context. */
 284 __BEGIN_DECLS
 285 extern struct __res_state *__res_get_state(void);
 286 extern void __res_put_state(struct __res_state *);
 287
 288 /*
 289  * Source and Binary compatibility; _res will not work properly
 290  * with multi-threaded programs.
 291  */
 292 extern struct __res_state *__res_state(void);
 293 #define _res (*__res_state())
 294
 295 __END_DECLS
 296
 297 #ifndef __BIND_NOSTATIC
 298 #define fp_nquery               __fp_nquery
 299 #define fp_query                __fp_query
 300 #define hostalias               __hostalias
 301 #define p_query                 __p_query
 302 #define res_close               __res_close
 303 #define res_isourserver         __res_isourserver
 304 #define res_opt                 __res_opt
 305 #define res_querydomain         __res_querydomain
 306 #define res_send                __res_send
 307 #define res_sendsigned          __res_sendsigned
 308
 309 #ifdef notdef
 310 /* NetBSD protects these via weak symbols. */
 311 #define res_init                __res_init
 312 #define res_query               __res_query
 313 #define res_mkquery             __res_mkquery
 314 #define dn_expand               __dn_expand
 315 #define res_search              __res_search
 316 #endif
 317
 318 __BEGIN_DECLS
 319 void            fp_nquery(const u_char *, int, FILE *);
 320 void            fp_query(const u_char *, FILE *);
 321 const char *    hostalias(const char *);
 322 void            p_query(const u_char *);
 323 void            res_close(void);
 324 int             res_init(void);
 325 int             res_opt(int, u_char *, int, int);
 326 int             res_isourserver(const struct sockaddr_in *);
 327 int             res_mkquery(int, const char *, int, int, const u_char *,
 328                                  int, const u_char *, u_char *, int);
 329 int             res_query(const char *, int, int, u_char *, int);
 330 int             res_querydomain(const char *, const char *, int, int,
 331                                      u_char *, int);
 332 int             res_search(const char *, int, int, u_char *, int);
 333 int             res_send(const u_char *, int, u_char *, int);
 334 int             res_sendsigned(const u_char *, int, ns_tsig_key *,
 335                                     u_char *, int);
 336 __END_DECLS
 337 #endif
 338
 339 #if !defined(SHARED_LIBBIND) || defined(LIB)
 340 /*
 341  * If libbind is a shared object (well, DLL anyway)
 342  * these externs break the linker when resolv.h is
 343  * included by a lib client (like named)
 344  * Make them go away if a client is including this
 345  *
 346  */
 347 extern const struct res_sym __p_key_syms[];
 348 extern const struct res_sym __p_cert_syms[];
 349 extern const struct res_sym __p_class_syms[];
 350 extern const struct res_sym __p_type_syms[];
 351 extern const struct res_sym __p_rcode_syms[];
 352 #endif /* SHARED_LIBBIND */
 353
 354 #define b64_ntop                __b64_ntop
 355 #define b64_pton                __b64_pton
 356 #define dn_comp                 __dn_comp
 357 #define dn_count_labels         __dn_count_labels
 358 #define dn_skipname             __dn_skipname
 359 #define fp_resstat              __fp_resstat
 360 #define loc_aton                __loc_aton
 361 #define loc_ntoa                __loc_ntoa
 362 #define p_cdname                __p_cdname
 363 #define p_cdnname               __p_cdnname
 364 #define p_class                 __p_class
 365 #define p_fqname                __p_fqname
 366 #define p_fqnname               __p_fqnname
 367 #define p_option                __p_option
 368 #define p_secstodate            __p_secstodate
 369 #define p_section               __p_section
 370 #define p_time                  __p_time
 371 #define p_type                  __p_type
 372 #define p_rcode                 __p_rcode
 373 #define p_sockun                __p_sockun
 374 #define putlong                 __putlong
 375 #define putshort                __putshort
 376 #define res_check               __res_check
 377 #define res_dnok                __res_dnok
 378 #define res_findzonecut         __res_findzonecut
 379 #define res_findzonecut2        __res_findzonecut2
 380 #define res_hnok                __res_hnok
 381 #define res_hostalias           __res_hostalias
 382 #define res_mailok              __res_mailok
 383 #define res_nameinquery         __res_nameinquery
 384 #define res_nclose              __res_nclose
 385 #define res_ninit               __res_ninit
 386 #define res_nmkquery            __res_nmkquery
 387 #define res_pquery              __res_pquery
 388 #define res_nquery              __res_nquery
 389 #define res_nquerydomain        __res_nquerydomain
 390 #define res_nsearch             __res_nsearch
 391 #define res_nsend               __res_nsend
 392 #define res_nsendsigned         __res_nsendsigned
 393 #define res_nisourserver        __res_nisourserver
 394 #define res_ownok               __res_ownok
 395 #define res_queriesmatch        __res_queriesmatch
 396 #define res_rndinit             __res_rndinit
 397 #define res_randomid            __res_randomid
 398 #define res_nrandomid           __res_nrandomid
 399 #define sym_ntop                __sym_ntop
 400 #define sym_ntos                __sym_ntos
 401 #define sym_ston                __sym_ston
 402 #define res_nopt                __res_nopt
 403 #define res_nopt_rdata          __res_nopt_rdata
 404 #define res_ndestroy            __res_ndestroy
 405 #define res_nametoclass         __res_nametoclass
 406 #define res_nametotype          __res_nametotype
 407 #define res_setservers          __res_setservers
 408 #define res_getservers          __res_getservers
 409 #define res_buildprotolist      __res_buildprotolist
 410 #define res_destroyprotolist    __res_destroyprotolist
 411 #define res_destroyservicelist  __res_destroyservicelist
 412 #define res_get_nibblesuffix    __res_get_nibblesuffix
 413 #define res_get_nibblesuffix2   __res_get_nibblesuffix2
 414 #define res_ourserver_p         __res_ourserver_p
 415 #define res_protocolname        __res_protocolname
 416 #define res_protocolnumber      __res_protocolnumber
 417 #define res_send_setqhook       __res_send_setqhook
 418 #define res_send_setrhook       __res_send_setrhook
 419 #define res_servicename         __res_servicename
 420 #define res_servicenumber       __res_servicenumber
 421 __BEGIN_DECLS
 422 int             res_hnok(const char *);
 423 int             res_ownok(const char *);
 424 int             res_mailok(const char *);
 425 struct timespec;
 426 int             res_check(res_state, struct timespec *);
 427 int             res_dnok(const char *);
 428 int             sym_ston(const struct res_sym *, const char *, int *);
 429 const char *    sym_ntos(const struct res_sym *, int, int *);
 430 const char *    sym_ntop(const struct res_sym *, int, int *);
 431 int             b64_ntop(u_char const *, size_t, char *, size_t);
 432 int             b64_pton(char const *, u_char *, size_t);
 433 int             loc_aton(const char *, u_char *);
 434 const char *    loc_ntoa(const u_char *, char *);
 435 int             dn_skipname(const u_char *, const u_char *);
 436 void            putlong(uint32_t, u_char *);
 437 void            putshort(uint16_t, u_char *);
 438 #ifndef __ultrix__
 439 uint16_t        _getshort(const u_char *);
 440 uint32_t        _getlong(const u_char *);
 441 #endif
 442 const char *    p_class(int);
 443 const char *    p_time(uint32_t);
 444 const char *    p_type(int);
 445 const char *    p_rcode(int);
 446 const char *    p_sockun(union res_sockaddr_union, char *, size_t);
 447 const u_char *  p_cdnname(const u_char *, const u_char *, int, FILE *);
 448 const u_char *  p_cdname(const u_char *, const u_char *, FILE *);
 449 const u_char *  p_fqnname(const u_char *, const u_char *,
 450                                int, char *, int);
 451 const u_char *  p_fqname(const u_char *, const u_char *, FILE *);
 452 const char *    p_option(u_long);
 453 char *          p_secstodate(u_long);
 454 int             dn_count_labels(const char *);
 455 int             dn_comp(const char *, u_char *, int, u_char **, u_char **);
 456 int             dn_expand(const u_char *, const u_char *, const u_char *,
 457                                char *, int);
 458 void            res_rndinit(res_state);
 459 u_int           res_randomid(void);
 460 u_int           res_nrandomid(res_state);
 461 int             res_nameinquery(const char *, int, int, const u_char *,
 462                                      const u_char *);
 463 int             res_queriesmatch(const u_char *, const u_char *,
 464                                       const u_char *, const u_char *);
 465 const char *    p_section(int, int);
 466 /* Things involving a resolver context. */
 467 int             res_ninit(res_state);
 468 int             res_nisourserver(const res_state, const struct sockaddr_in *);
 469 void            fp_resstat(const res_state, FILE *);
 470 void            res_pquery(const res_state, const u_char *, int, FILE *);
 471 const char *    res_hostalias(const res_state, const char *, char *, size_t);
 472 int             res_nquery(res_state, const char *, int, int, u_char *, int);
 473 int             res_nsearch(res_state, const char *, int, int, u_char *, int);
 474 int             res_nquerydomain(res_state, const char *, const char *,
 475                                       int, int, u_char *, int);
 476 int             res_nmkquery(res_state, int, const char *, int, int,
 477                                   const u_char *, int, const u_char *,
 478                                   u_char *, int);
 479 int             res_nsend(res_state, const u_char *, int, u_char *, int);
 480 int             res_nsendsigned(res_state, const u_char *, int,
 481                                      ns_tsig_key *, u_char *, int);
 482 int             res_findzonecut(res_state, const char *, ns_class, int,
 483                                      char *, size_t, struct in_addr *, int);
 484 int             res_findzonecut2(res_state, const char *, ns_class, int,
 485                                       char *, size_t,
 486                                       union res_sockaddr_union *, int);
 487 void            res_nclose(res_state);
 488 int             res_nopt(res_state, int, u_char *, int, int);
 489 int             res_nopt_rdata(res_state, int, u_char *, int, u_char *,
 490                                     u_short, u_short, u_char *);
 491 void            res_send_setqhook(res_send_qhook);
 492 void            res_send_setrhook(res_send_rhook);
 493 int             __res_vinit(res_state, int);
 494 void            res_destroyservicelist(void);
 495 const char *    res_servicename(uint16_t, const char *);
 496 const char *    res_protocolname(int);
 497 void            res_destroyprotolist(void);
 498 void            res_buildprotolist(void);
 499 const char *    res_get_nibblesuffix(res_state);
 500 const char *    res_get_nibblesuffix2(res_state);
 501 void            res_ndestroy(res_state);
 502 uint16_t        res_nametoclass(const char *, int *);
 503 uint16_t        res_nametotype(const char *, int *);
 504 void            res_setservers(res_state,
 505                                     const union res_sockaddr_union *, int);
 506 int             res_getservers(res_state,
 507                                     union res_sockaddr_union *, int);
 508 __END_DECLS
 509
 510 #endif /* !_RESOLV_H_ */