resolv.h

   1 /*
   2  * Copyright (c) 1983, 1987, 1989
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies.
  40  *
  41  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  42  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  43  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  44  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  45  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  46  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  47  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  48  * SOFTWARE.
  49  */
  50
  51 /*
  52  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
  53  *      $Id: resolv.h,v 1.1 2006/03/01 19:01:39 majka Exp $
  54  */
  55
  56 /*
  57  * Important note regarding the BIND-9 API on Mac OS
  58  * -------------------------------------------------
  59  *
  60  * Mac OS supports a DNS query routing API (see <dns.h>) which is used by
  61  * most system services to access DNS.  The BIND-9 APIs described here are
  62  * a lower-level that does not do query routing or search amongst multiple
  63  * resolver clients.  The results of DNS queries from this API may differ
  64  * significantly from the results of queries sent to the <dns.h> API.  We
  65  * strongly encourage developers to use higher-level APIs where possible.
  66  */
  67
  68 #ifndef _RESOLV_9_H_
  69 #define _RESOLV_9_H_
  70
  71 #include <sys/param.h>
  72 #if (!defined(BSD)) || (BSD < 199306)
  73 # include <sys/bitypes.h>
  74 #else
  75 # include <sys/types.h>
  76 #endif
  77 #include <sys/cdefs.h>
  78 #include <sys/socket.h>
  79 #include <netinet/in.h>
  80 #include <stdio.h>
  81 #include <nameser.h>
  82
  83 /*
  84  * Revision information.  This is the release date in YYYYMMDD format.
  85  * It can change every day so the right thing to do with it is use it
  86  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  87  * compare for equality; rather, use it to determine whether your resolver
  88  * is new enough to contain a certain feature.
  89  */
  90
  91 #define __RES   19991006
  92
  93 #define __h_errno_set _res_9_h_errno_set
  94 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  95
  96 #define __res_state __res_9_state
  97 struct __res_state; /* forward */
  98
  99 __BEGIN_DECLS
 100 void __h_errno_set(struct __res_state *res, int err);
 101 __END_DECLS
 102
 103 /*
 104  * Resolver configuration file.
 105  * Normally not present, but may contain the address of the
 106  * inital name server(s) to query and the domain search list.
 107  *
 108  * Apple Note:  The default DNS resolver client configuration
 109  * is now stored in a system configuration database, not in
 110  */
 111
 112 #ifndef _PATH_RESCONF
 113 #define _PATH_RESCONF        "/etc/resolv.conf"
 114 #endif
 115
 116 #define res_goahead res_9_goahead
 117 #define res_nextns res_9_nextns
 118 #define res_modified res_9_modified
 119 #define res_done res_9_done
 120 #define res_error res_9_error
 121 #define res_sendhookact res_9_sendhookact
 122
 123 typedef enum
 124 {
 125         res_goahead,
 126         res_nextns,
 127         res_modified,
 128         res_done,
 129         res_error
 130 } res_sendhookact;
 131
 132 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr * const *ns,
 133                                               const u_char **query,
 134                                               int *querylen,
 135                                               u_char *ans,
 136                                               int anssiz,
 137                                               int *resplen));
 138
 139 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr *ns,
 140                                               const u_char *query,
 141                                               int querylen,
 142                                               u_char *ans,
 143                                               int anssiz,
 144                                               int *resplen));
 145
 146 #define res_sym res_9_sym
 147
 148 struct res_sym
 149 {
 150         int             number;    /* Identifying number, like T_MX */
 151         const char *    name;      /* Its symbolic name, like "MX" */
 152         const char *    humanname; /* Its fun name, like "mail exchanger" */
 153 };
 154
 155 /*
 156  * Global defines and variables for resolver stub.
 157  */
 158 #define MAXNS                   3       /* max # name servers we'll track */
 159 #define MAXDFLSRCH              3       /* # default domain levels to try */
 160 #define MAXDNSRCH               6       /* max # domains in search path */
 161 #define LOCALDOMAINPARTS        2       /* min levels in name that is "local" */
 162
 163 #define RES_TIMEOUT             5       /* min. seconds between retries */
 164 #define MAXRESOLVSORT           10      /* number of net to sort on */
 165 #define RES_MAXNDOTS            15      /* should reflect bit field size */
 166 #define RES_MAXRETRANS          30      /* only for resolv.conf/RES_OPTIONS */
 167 #define RES_MAXRETRY            5       /* only for resolv.conf/RES_OPTIONS */
 168 #define RES_DFLRETRY            2       /* Default #/tries. */
 169 #define RES_MAXTIME             65535   /* Infinity, in milliseconds. */
 170
 171 #define __res_state_ext __res_9_state_ext
 172 struct __res_state_ext;
 173
 174 #define __res_state __res_9_state
 175 struct __res_state {
 176         int     retrans;                /* retransmition time interval */
 177         int     retry;                  /* number of times to transmit (attempts, not retries) */
 178 #ifdef sun
 179         u_int   options;                /* option flags - see below. */
 180 #else
 181         u_long  options;                /* option flags - see below. */
 182 #endif
 183         int     nscount;                /* number of name servers */
 184         struct sockaddr_in
 185                 nsaddr_list[MAXNS];     /* address of name server */
 186 #define nsaddr  nsaddr_list[0]          /* for backward compatibility */
 187         u_short id;                     /* current message id */
 188         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
 189         char    defdname[256];          /* default domain (deprecated) */
 190 #ifdef sun
 191         u_int   pfcode;                 /* RES_PRF_ flags - see below. */
 192 #else
 193         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
 194 #endif
 195         unsigned ndots:4;               /* threshold for initial abs. query */
 196         unsigned nsort:4;               /* number of elements in sort_list[] */
 197         char    unused[3];
 198         struct {
 199                 struct in_addr  addr;
 200                 u_int32_t       mask;
 201         } sort_list[MAXRESOLVSORT];
 202         res_send_qhook qhook;           /* query hook */
 203         res_send_rhook rhook;           /* response hook */
 204         int     res_h_errno;            /* last one set for this context */
 205         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
 206         u_int   _flags;                 /* PRIVATE: see below */
 207         u_int   _pad;                   /* make _u 64 bit aligned */
 208         union {
 209                 /* On an 32-bit arch this means 512b total. */
 210                 char    pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
 211                 struct {
 212                         u_int16_t               nscount;
 213                         u_int16_t               nstimes[MAXNS]; /* ms. */
 214                         int                     nssocks[MAXNS];
 215                         struct __res_state_ext *ext;    /* extention for IPv6 */
 216                 } _ext;
 217         } _u;
 218 };
 219
 220 #define res_state res_9_state
 221
 222 typedef struct __res_state *res_state;
 223
 224 #define res_sockaddr_union res_9_sockaddr_union
 225
 226 union res_sockaddr_union {
 227         struct sockaddr_in      sin;
 228 #ifdef IN6ADDR_ANY_INIT
 229         struct sockaddr_in6     sin6;
 230 #endif
 231 #ifdef ISC_ALIGN64
 232         int64_t                 __align64;      /* 64bit alignment */
 233 #else
 234         int32_t                 __align32;      /* 32bit alignment */
 235 #endif
 236         char                    __space[128];   /* max size */
 237 };
 238
 239 /*
 240  * Resolver flags (used to be discrete per-module statics ints).
 241  */
 242 #define RES_F_VC                        0x00000001      /* socket is TCP */
 243 #define RES_F_CONN              0x00000002      /* socket is connected */
 244 #define RES_F_EDNS0ERR  0x00000004      /* EDNS0 caused errors */
 245
 246 /* res_findzonecut2() options */
 247 #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
 248 #define RES_IPV4ONLY            0x00000002      /* IPv4 only */
 249 #define RES_IPV6ONLY            0x00000004      /* IPv6 only */
 250
 251 /*
 252  * Resolver options (keep these in synch with res_debug.c, please)
 253  */
 254 #define RES_INIT                        0x00000001      /* address initialized */
 255 #define RES_DEBUG               0x00000002      /* print debug messages */
 256 #define RES_AAONLY              0x00000004      /* authoritative answers only (!IMPL)*/
 257 #define RES_USEVC               0x00000008      /* use virtual circuit */
 258 #define RES_PRIMARY             0x00000010      /* query primary server only (!IMPL) */
 259 #define RES_IGNTC               0x00000020      /* ignore trucation errors */
 260 #define RES_RECURSE             0x00000040      /* recursion desired */
 261 #define RES_DEFNAMES            0x00000080      /* use default domain name */
 262 #define RES_STAYOPEN            0x00000100      /* Keep TCP socket open */
 263 #define RES_DNSRCH              0x00000200      /* search up local domain tree */
 264 #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
 265 #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
 266 #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
 267 #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
 268 #define RES_ROTATE              0x00004000      /* rotate ns list after each query */
 269 #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 270 #define RES_KEEPTSIG            0x00010000      /* do not strip TSIG records */
 271 #define RES_BLAST               0x00020000      /* blast all recursive servers */
 272 #define RES_NO_NIBBLE   0x00040000      /* disable IPv6 nibble mode reverse */
 273 #define RES_NO_BITSTRING 0x00080000     /* disable IPv6 bitstring mode reverse */
 274 #define RES_NOTLDQUERY  0x00100000      /* don't unqualified name as a tld */
 275 #define RES_USE_DNSSEC  0x00200000      /* use DNSSEC using OK bit in OPT */
 276 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 277 #define RES_USE_DNAME   0x10000000      /* use DNAME */
 278 #define RES_USE_A6              0x20000000      /* use A6 */
 279 #define RES_USE_EDNS0   0x40000000      /* use EDNS0 if configured */
 280 #define RES_NO_NIBBLE2  0x80000000      /* disable alternate nibble lookup */
 281
 282 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH | RES_INSECURE1)
 283
 284 /*
 285  * Resolver "pfcode" values.  Used by dig.
 286  */
 287 #define RES_PRF_STATS   0x00000001
 288 #define RES_PRF_UPDATE  0x00000002
 289 #define RES_PRF_CLASS   0x00000004
 290 #define RES_PRF_CMD             0x00000008
 291 #define RES_PRF_QUES            0x00000010
 292 #define RES_PRF_ANS             0x00000020
 293 #define RES_PRF_AUTH            0x00000040
 294 #define RES_PRF_ADD             0x00000080
 295 #define RES_PRF_HEAD1   0x00000100
 296 #define RES_PRF_HEAD2   0x00000200
 297 #define RES_PRF_TTLID   0x00000400
 298 #define RES_PRF_HEADX   0x00000800
 299 #define RES_PRF_QUERY   0x00001000
 300 #define RES_PRF_REPLY   0x00002000
 301 #define RES_PRF_INIT            0x00004000
 302 #define RES_PRF_TRUNC   0x00008000
 303 /*                      0x00010000      */
 304
 305 /* Things involving an internal (static) resolver context. */
 306 #if !defined(__BIND_NOSTATIC) && !defined(__BIND_INSTALLAPI)
 307 extern struct __res_state _res;
 308 #endif
 309
 310 #ifndef __BIND_NOSTATIC
 311 #define fp_nquery               res_9_fp_nquery
 312 #define fp_query                        res_9_fp_query
 313 #define hostalias               res_9_hostalias_1
 314 #define p_query                 res_9_p_query
 315 #define res_close               res_9_close
 316 #define res_init                        res_9_init
 317 #define res_isourserver res_9_isourserver
 318 #define res_mkquery             res_9_mkquery
 319 #define res_query               res_9_query
 320 #define res_querydomain res_9_querydomain
 321 #define res_search              res_9_search
 322 #define res_send                        res_9_send
 323 #define res_sendsigned  res_9_sendsigned
 324
 325 __BEGIN_DECLS
 326 void            fp_nquery __P((const u_char *, int, FILE *));
 327 void            fp_query __P((const u_char *, FILE *));
 328 const char *hostalias __P((const char *));
 329 void            p_query __P((const u_char *));
 330 void            res_close __P((void));
 331 int             res_init __P((void));
 332 int             res_isourserver __P((const struct sockaddr_in *));
 333 int             res_mkquery __P((int, const char *, int, int, const u_char *,
 334                                  int, const u_char *, u_char *, int));
 335 int             res_query __P((const char *, int, int, u_char *, int));
 336 int             res_querydomain __P((const char *, const char *, int, int,
 337                                      u_char *, int));
 338 int             res_search __P((const char *, int, int, u_char *, int));
 339 int             res_send __P((const u_char *, int, u_char *, int));
 340 int             res_sendsigned __P((const u_char *, int, ns_tsig_key *,
 341                                     u_char *, int));
 342 __END_DECLS
 343 #endif
 344
 345 #if !defined(SHARED_LIBBIND) || defined(LIB)
 346 /*
 347  * If libbind is a shared object (well, DLL anyway)
 348  * these externs break the linker when resolv.h is
 349  * included by a lib client (like named)
 350  * Make them go away if a client is including this
 351  *
 352  */
 353 #define res_sym res_9_sym
 354 #define __p_type_syms __res_9_p_type_syms
 355 extern const struct res_sym __p_type_syms[];
 356 #endif /* SHARED_LIBBIND */
 357
 358 #define b64_ntop                                        res_9_b64_ntop
 359 #define b64_pton                                        res_9_b64_pton
 360 #define dn_comp                                 res_9_dn_comp
 361 #define dn_count_labels                 res_9_dn_count_labels
 362 #define dn_expand                               res_9_dn_expand
 363 #define dn_skipname                             res_9_dn_skipname
 364 #define fp_resstat                              res_9_fp_resstat
 365 #define loc_aton                                        res_9_loc_aton
 366 #define loc_ntoa                                        res_9_loc_ntoa
 367 #define p_cdname                                        res_9_p_cdname
 368 #define p_cdnname                               res_9_p_cdnname
 369 #define p_class                                 res_9_p_class
 370 #define p_fqname                                        res_9_p_fqname
 371 #define p_fqnname                               res_9_p_fqnname
 372 #define p_option                                        res_9_p_option
 373 #define p_secstodate                            res_9_p_secstodate
 374 #define p_section                               res_9_p_section
 375 #define p_time                                  res_9_p_time
 376 #define p_type                                  res_9_p_type
 377 #define p_rcode                                 res_9_p_rcode
 378 #define putlong                                 res_9_putlong
 379 #define putshort                                        res_9_putshort
 380 #define res_dnok                                        res_9_dnok
 381 #define res_findzonecut                 res_9_findzonecut
 382 #define res_findzonecut2                        res_9_findzonecut2
 383 #define res_hnok                                        res_9_hnok
 384 #define res_hostalias                   res_9_hostalias_2
 385 #define res_mailok                              res_9_mailok
 386 #define res_nameinquery                 res_9_nameinquery
 387 #define res_nclose                              res_9_nclose
 388 #define res_ninit                               res_9_ninit
 389 #define res_nmkquery                            res_9_nmkquery
 390 #define res_pquery                              res_9_pquery
 391 #define res_nquery                              res_9_nquery
 392 #define res_nquerydomain                        res_9_nquerydomain
 393 #define res_nsearch                             res_9_nsearch
 394 #define res_nsend                               res_9_nsend
 395 #define res_nsendsigned                 res_9_nsendsigned
 396 #define res_nisourserver                        res_9_nisourserver
 397 #define res_ownok                               res_9_ownok
 398 #define res_queriesmatch                        res_9_queriesmatch
 399 #define res_randomid                            res_9_randomid
 400 #define sym_ntop                                        res_9_sym_ntop
 401 #define sym_ntos                                        res_9_sym_ntos
 402 #define sym_ston                                        res_9_sym_ston
 403 #define res_nopt                                        res_9_nopt
 404 #define res_ndestroy                            res_9_ndestroy
 405 #define res_nametoclass                 res_9_nametoclass
 406 #define res_nametotype                  res_9_nametotype
 407 #define res_setservers                  res_9_setservers
 408 #define res_getservers                  res_9_getservers
 409 #define _getshort                               res_9_getshort
 410 #define _getlong                                        res_9_getlong
 411 #define __res_vinit                             res_9_vinit
 412
 413 __BEGIN_DECLS
 414 int             res_hnok __P((const char *));
 415 int             res_ownok __P((const char *));
 416 int             res_mailok __P((const char *));
 417 int             res_dnok __P((const char *));
 418 int             sym_ston __P((const struct res_sym *, const char *, int *));
 419 const char *    sym_ntos __P((const struct res_sym *, int, int *));
 420 const char *sym_ntop __P((const struct res_sym *, int, int *));
 421 int             b64_ntop __P((u_char const *, size_t, char *, size_t));
 422 int             b64_pton __P((char const *, u_char *, size_t));
 423 int             loc_aton __P((const char *ascii, u_char *binary));
 424 const char *    loc_ntoa __P((const u_char *binary, char *ascii));
 425 int             dn_skipname __P((const u_char *, const u_char *));
 426 void            putlong __P((u_int32_t, u_char *));
 427 void            putshort __P((u_int16_t, u_char *));
 428 #ifndef __ultrix__
 429 u_int16_t       _getshort __P((const u_char *src));
 430 u_int32_t       _getlong __P((const u_char *src));
 431 #endif
 432 const char * p_class __P((int));
 433 const char * p_time __P((u_int32_t));
 434 const char * p_type __P((int));
 435 const char * p_rcode __P((int));
 436 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
 437 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
 438 const u_char * p_fqnname __P((const u_char *cp, const u_char *msg, int, char *, int));
 439 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
 440 const char * p_option __P((u_long option));
 441 char * p_secstodate __P((u_long));
 442 int             dn_count_labels __P((const char *));
 443 int             dn_comp __P((const char *, u_char *, int, u_char **, u_char **));
 444 int             dn_expand __P((const u_char *, const u_char *, const u_char *, char *, int));
 445 u_int           res_randomid __P((void));
 446 int             res_nameinquery __P((const char *, int, int, const u_char *, const u_char *));
 447 int             res_queriesmatch __P((const u_char *, const u_char *, const u_char *, const u_char *));
 448 const char * p_section __P((int section, int opcode));
 449
 450 /* Things involving a resolver context. */
 451 int             res_ninit __P((res_state));
 452 int             res_nisourserver __P((const res_state, const struct sockaddr_in *));
 453 void            fp_resstat __P((const res_state, FILE *));
 454 void            res_pquery __P((const res_state, const u_char *, int, FILE *));
 455 const char *res_hostalias __P((const res_state, const char *, char *, size_t));
 456 int             res_nquery __P((res_state, const char *, int, int, u_char *, int));
 457 int             res_nsearch __P((res_state, const char *, int, int, u_char *, int));
 458 int             res_nquerydomain __P((res_state, const char *, const char *, int, int, u_char *, int));
 459 int             res_nmkquery __P((res_state, int, const char *, int, int, const u_char *, int, const u_char *, u_char *, int));
 460 int             res_nsend __P((res_state, const u_char *, int, u_char *, int));
 461 int             res_nsendsigned __P((res_state, const u_char *, int, ns_tsig_key *, u_char *, int));
 462 int             res_findzonecut __P((res_state, const char *, ns_class, int, char *, size_t, struct in_addr *, int));
 463 int             res_findzonecut2 __P((res_state, const char *, ns_class, int, char *, size_t, union res_sockaddr_union *, int));
 464 void            res_nclose __P((res_state));
 465 int             res_nopt __P((res_state, int, u_char *, int, int));
 466 int             __res_vinit __P((res_state, int));
 467 void            res_destroyservicelist __P((void));
 468 const char *    res_servicename __P((u_int16_t port, const char *proto));
 469 const char *    res_protocolname __P((int num));
 470 void            res_destroyprotolist __P((void));
 471 void            res_buildprotolist __P((void));
 472 const char *    res_get_nibblesuffix __P((res_state));
 473 const char *    res_get_nibblesuffix2 __P((res_state));
 474 const char *    res_get_bitstringsuffix __P((res_state));
 475 void            res_ndestroy __P((res_state));
 476 u_int16_t       res_nametoclass __P((const char *buf, int *success));
 477 u_int16_t       res_nametotype __P((const char *buf, int *success));
 478 void            res_setservers __P((res_state, const union res_sockaddr_union *, int));
 479 int             res_getservers __P((res_state, union res_sockaddr_union *, int));
 480 __END_DECLS
 481
 482 #endif /* !_RESOLV_9_H_ */