resolv/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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  32  *
  33  * Permission to use, copy, modify, and distribute this software for any
  34  * purpose with or without fee is hereby granted, provided that the above
  35  * copyright notice and this permission notice appear in all copies.
  36  *
  37  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  38  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  39  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  40  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  41  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  42  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  43  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  44  * SOFTWARE.
  45  */
  46
  47 /*
  48  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
  49  *      $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
  50  */
  51
  52 #ifndef _RESOLV_H_
  53
  54 /* These headers are needed for types used in the `struct res_state'
  55    declaration.  */
  56 #include <sys/types.h>
  57 #include <netinet/in.h>
  58
  59 #ifndef __need_res_state
  60 # define _RESOLV_H_
  61
  62 # include <sys/param.h>
  63 # include <sys/cdefs.h>
  64 # include <stdio.h>
  65 # include <arpa/nameser.h>
  66 #endif
  67
  68 #ifndef __res_state_defined
  69 # define __res_state_defined
  70
  71 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
  72         res_sendhookact;
  73
  74 typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *__ns,
  75                                            const u_char **__query,
  76                                            int *__querylen,
  77                                            u_char *__ans,
  78                                            int __anssiz,
  79                                            int *__resplen);
  80
  81 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *__ns,
  82                                            const u_char *__query,
  83                                            int __querylen,
  84                                            u_char *__ans,
  85                                            int __anssiz,
  86                                            int *__resplen);
  87
  88 /*
  89  * Global defines and variables for resolver stub.
  90  */
  91 # define MAXNS                  3       /* max # name servers we'll track */
  92 # define MAXDFLSRCH             3       /* # default domain levels to try */
  93 # define MAXDNSRCH              6       /* max # domains in search path */
  94 # define LOCALDOMAINPARTS       2       /* min levels in name that is "local" */
  95
  96 # define RES_TIMEOUT            5       /* min. seconds between retries */
  97 # define MAXRESOLVSORT          10      /* number of net to sort on */
  98 # define RES_MAXNDOTS           15      /* should reflect bit field size */
  99 # define RES_MAXRETRANS         30      /* only for resolv.conf/RES_OPTIONS */
 100 # define RES_MAXRETRY           5       /* only for resolv.conf/RES_OPTIONS */
 101 # define RES_DFLRETRY           2       /* Default #/tries. */
 102 # define RES_MAXTIME            65535   /* Infinity, in milliseconds. */
 103
 104 struct __res_state {
 105         int     retrans;                /* retransmition time interval */
 106         int     retry;                  /* number of times to retransmit */
 107         u_long  options;                /* option flags - see below. */
 108         int     nscount;                /* number of name servers */
 109         struct sockaddr_in
 110                 nsaddr_list[MAXNS];     /* address of name server */
 111 # define nsaddr nsaddr_list[0]          /* for backward compatibility */
 112         u_short id;                     /* current message id */
 113         /* 2 byte hole here.  */
 114         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
 115         char    defdname[256];          /* default domain (deprecated) */
 116         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
 117         unsigned ndots:4;               /* threshold for initial abs. query */
 118         unsigned nsort:4;               /* number of elements in sort_list[] */
 119         unsigned ipv6_unavail:1;        /* connecting to IPv6 server failed */
 120         unsigned unused:23;
 121         struct {
 122                 struct in_addr  addr;
 123                 u_int32_t       mask;
 124         } sort_list[MAXRESOLVSORT];
 125         /* 4 byte hole here on 64-bit architectures.  */
 126         res_send_qhook qhook;           /* query hook */
 127         res_send_rhook rhook;           /* response hook */
 128         int     res_h_errno;            /* last one set for this context */
 129         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
 130         u_int   _flags;                 /* PRIVATE: see below */
 131         /* 4 byte hole here on 64-bit architectures.  */
 132         union {
 133                 char    pad[52];        /* On an i386 this means 512b total. */
 134                 struct {
 135                         u_int16_t               nscount;
 136                         u_int16_t               nsmap[MAXNS];
 137                         int                     nssocks[MAXNS];
 138                         u_int16_t               nscount6;
 139                         u_int16_t               nsinit;
 140                         struct sockaddr_in6     *nsaddrs[MAXNS];
 141 #ifdef _LIBC
 142                         unsigned long long int  initstamp
 143                           __attribute__((packed));
 144 #else
 145                         unsigned int            _initstamp[2];
 146 #endif
 147                 } _ext;
 148         } _u;
 149 };
 150
 151 typedef struct __res_state *res_state;
 152 # undef __need_res_state
 153 #endif
 154
 155 #ifdef _RESOLV_H_
 156 /*
 157  * Revision information.  This is the release date in YYYYMMDD format.
 158  * It can change every day so the right thing to do with it is use it
 159  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
 160  * compare for equality; rather, use it to determine whether your resolver
 161  * is new enough to contain a certain feature.
 162  */
 163
 164 #define __RES   19991006
 165
 166 /*
 167  * Resolver configuration file.
 168  * Normally not present, but may contain the address of the
 169  * inital name server(s) to query and the domain search list.
 170  */
 171
 172 #ifndef _PATH_RESCONF
 173 #define _PATH_RESCONF        "/etc/resolv.conf"
 174 #endif
 175
 176 struct res_sym {
 177         int     number;         /* Identifying number, like T_MX */
 178         char *  name;           /* Its symbolic name, like "MX" */
 179         char *  humanname;      /* Its fun name, like "mail exchanger" */
 180 };
 181
 182 /*
 183  * Resolver flags (used to be discrete per-module statics ints).
 184  */
 185 #define RES_F_VC        0x00000001      /* socket is TCP */
 186 #define RES_F_CONN      0x00000002      /* socket is connected */
 187 #define RES_F_EDNS0ERR  0x00000004      /* EDNS0 caused errors */
 188
 189 /* res_findzonecut() options */
 190 #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
 191
 192 /*
 193  * Resolver options (keep these in synch with res_debug.c, please)
 194  */
 195 #define RES_INIT        0x00000001      /* address initialized */
 196 #define RES_DEBUG       0x00000002      /* print debug messages */
 197 #define RES_AAONLY      0x00000004      /* authoritative answers only (!IMPL)*/
 198 #define RES_USEVC       0x00000008      /* use virtual circuit */
 199 #define RES_PRIMARY     0x00000010      /* query primary server only (!IMPL) */
 200 #define RES_IGNTC       0x00000020      /* ignore trucation errors */
 201 #define RES_RECURSE     0x00000040      /* recursion desired */
 202 #define RES_DEFNAMES    0x00000080      /* use default domain name */
 203 #define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */
 204 #define RES_DNSRCH      0x00000200      /* search up local domain tree */
 205 #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
 206 #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
 207 #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
 208 #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
 209 #define RES_ROTATE      0x00004000      /* rotate ns list after each query */
 210 #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 211 #define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
 212 #define RES_BLAST       0x00020000      /* blast all recursive servers */
 213 #define RES_USEBSTRING  0x00040000      /* IPv6 reverse lookup with byte
 214                                            strings */
 215 #define RES_NOIP6DOTINT 0x00080000      /* Do not use .ip6.int in IPv6
 216                                            reverse lookup */
 217 #define RES_USE_EDNS0   0x00100000      /* Use EDNS0.  */
 218 #define RES_SNGLKUP     0x00200000      /* one outstanding request at a time */
 219 #define RES_SNGLKUPREOP 0x00400000      /* -"-, but open new socket for each
 220                                            request */
 221 #define RES_USE_DNSSEC  0x00800000      /* use DNSSEC using OK bit in OPT */
 222 #define RES_NOTLDQUERY  0x01000000      /* Do not look up unqualified name
 223                                            as a TLD.  */
 224
 225 #define RES_DEFAULT     (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
 226
 227 /*
 228  * Resolver "pfcode" values.  Used by dig.
 229  */
 230 #define RES_PRF_STATS   0x00000001
 231 #define RES_PRF_UPDATE  0x00000002
 232 #define RES_PRF_CLASS   0x00000004
 233 #define RES_PRF_CMD     0x00000008
 234 #define RES_PRF_QUES    0x00000010
 235 #define RES_PRF_ANS     0x00000020
 236 #define RES_PRF_AUTH    0x00000040
 237 #define RES_PRF_ADD     0x00000080
 238 #define RES_PRF_HEAD1   0x00000100
 239 #define RES_PRF_HEAD2   0x00000200
 240 #define RES_PRF_TTLID   0x00000400
 241 #define RES_PRF_HEADX   0x00000800
 242 #define RES_PRF_QUERY   0x00001000
 243 #define RES_PRF_REPLY   0x00002000
 244 #define RES_PRF_INIT    0x00004000
 245 /*                      0x00008000      */
 246
 247 /* Things involving an internal (static) resolver context. */
 248 __BEGIN_DECLS
 249 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
 250 __END_DECLS
 251 #define _res (*__res_state())
 252
 253 #ifndef __BIND_NOSTATIC
 254 #define fp_nquery               __fp_nquery
 255 #define fp_query                __fp_query
 256 #define hostalias               __hostalias
 257 #define p_query                 __p_query
 258 #define res_close               __res_close
 259 #define res_init                __res_init
 260 #define res_isourserver         __res_isourserver
 261 #define res_mkquery             __res_mkquery
 262 #define res_query               __res_query
 263 #define res_querydomain         __res_querydomain
 264 #define res_search              __res_search
 265 #define res_send                __res_send
 266
 267 __BEGIN_DECLS
 268 void            fp_nquery (const u_char *, int, FILE *) __THROW;
 269 void            fp_query (const u_char *, FILE *) __THROW;
 270 const char *    hostalias (const char *) __THROW;
 271 void            p_query (const u_char *) __THROW;
 272 void            res_close (void) __THROW;
 273 int             res_init (void) __THROW;
 274 int             res_isourserver (const struct sockaddr_in *) __THROW;
 275 int             res_mkquery (int, const char *, int, int, const u_char *,
 276                              int, const u_char *, u_char *, int) __THROW;
 277 int             res_query (const char *, int, int, u_char *, int) __THROW;
 278 int             res_querydomain (const char *, const char *, int, int,
 279                                  u_char *, int) __THROW;
 280 int             res_search (const char *, int, int, u_char *, int) __THROW;
 281 int             res_send (const u_char *, int, u_char *, int) __THROW;
 282 __END_DECLS
 283 #endif
 284
 285 #define b64_ntop                __b64_ntop
 286 #define b64_pton                __b64_pton
 287 #define dn_comp                 __dn_comp
 288 #define dn_count_labels         __dn_count_labels
 289 #define dn_expand               __dn_expand
 290 #define dn_skipname             __dn_skipname
 291 #define fp_resstat              __fp_resstat
 292 #define loc_aton                __loc_aton
 293 #define loc_ntoa                __loc_ntoa
 294 #define p_cdname                __p_cdname
 295 #define p_cdnname               __p_cdnname
 296 #define p_class                 __p_class
 297 #define p_fqname                __p_fqname
 298 #define p_fqnname               __p_fqnname
 299 #define p_option                __p_option
 300 #define p_secstodate            __p_secstodate
 301 #define p_section               __p_section
 302 #define p_time                  __p_time
 303 #define p_type                  __p_type
 304 #define p_rcode                 __p_rcode
 305 #define putlong                 __putlong
 306 #define putshort                __putshort
 307 #define res_dnok                __res_dnok
 308 #define res_hnok                __res_hnok
 309 #define res_hostalias           __res_hostalias
 310 #define res_mailok              __res_mailok
 311 #define res_nameinquery         __res_nameinquery
 312 #define res_nclose              __res_nclose
 313 #define res_ninit               __res_ninit
 314 #define res_nmkquery            __res_nmkquery
 315 #define res_npquery             __res_npquery
 316 #define res_nquery              __res_nquery
 317 #define res_nquerydomain        __res_nquerydomain
 318 #define res_nsearch             __res_nsearch
 319 #define res_nsend               __res_nsend
 320 #define res_nisourserver        __res_nisourserver
 321 #define res_ownok               __res_ownok
 322 #define res_queriesmatch        __res_queriesmatch
 323 #define res_randomid            __res_randomid
 324 #define sym_ntop                __sym_ntop
 325 #define sym_ntos                __sym_ntos
 326 #define sym_ston                __sym_ston
 327 __BEGIN_DECLS
 328 int             res_hnok (const char *) __THROW;
 329 int             res_ownok (const char *) __THROW;
 330 int             res_mailok (const char *) __THROW;
 331 int             res_dnok (const char *) __THROW;
 332 int             sym_ston (const struct res_sym *, const char *, int *) __THROW;
 333 const char *    sym_ntos (const struct res_sym *, int, int *) __THROW;
 334 const char *    sym_ntop (const struct res_sym *, int, int *) __THROW;
 335 int             b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
 336 int             b64_pton (char const *, u_char *, size_t) __THROW;
 337 int             loc_aton (const char *__ascii, u_char *__binary) __THROW;
 338 const char *    loc_ntoa (const u_char *__binary, char *__ascii) __THROW;
 339 int             dn_skipname (const u_char *, const u_char *) __THROW;
 340 void            putlong (u_int32_t, u_char *) __THROW;
 341 void            putshort (u_int16_t, u_char *) __THROW;
 342 const char *    p_class (int) __THROW;
 343 const char *    p_time (u_int32_t) __THROW;
 344 const char *    p_type (int) __THROW;
 345 const char *    p_rcode (int) __THROW;
 346 const u_char *  p_cdnname (const u_char *, const u_char *, int, FILE *)
 347      __THROW;
 348 const u_char *  p_cdname (const u_char *, const u_char *, FILE *) __THROW;
 349 const u_char *  p_fqnname (const u_char *__cp, const u_char *__msg,
 350                            int, char *, int) __THROW;
 351 const u_char *  p_fqname (const u_char *, const u_char *, FILE *) __THROW;
 352 const char *    p_option (u_long __option) __THROW;
 353 char *          p_secstodate (u_long) __THROW;
 354 int             dn_count_labels (const char *) __THROW;
 355 int             dn_comp (const char *, u_char *, int, u_char **, u_char **)
 356      __THROW;
 357 int             dn_expand (const u_char *, const u_char *, const u_char *,
 358                            char *, int) __THROW;
 359 u_int           res_randomid (void) __THROW;
 360 int             res_nameinquery (const char *, int, int,
 361                                  const u_char *, const u_char *) __THROW;
 362 int             res_queriesmatch (const u_char *, const u_char *,
 363                                   const u_char *, const u_char *) __THROW;
 364 const char *    p_section (int __section, int __opcode) __THROW;
 365 /* Things involving a resolver context. */
 366 int             res_ninit (res_state) __THROW;
 367 int             res_nisourserver (const res_state,
 368                                   const struct sockaddr_in *) __THROW;
 369 void            fp_resstat (const res_state, FILE *) __THROW;
 370 void            res_npquery (const res_state, const u_char *, int, FILE *)
 371      __THROW;
 372 const char *    res_hostalias (const res_state, const char *, char *, size_t)
 373      __THROW;
 374 int             res_nquery (res_state, const char *, int, int, u_char *, int)
 375      __THROW;
 376 int             res_nsearch (res_state, const char *, int, int, u_char *, int)
 377      __THROW;
 378 int             res_nquerydomain (res_state, const char *, const char *, int,
 379                                   int, u_char *, int) __THROW;
 380 int             res_nmkquery (res_state, int, const char *, int, int,
 381                               const u_char *, int, const u_char *, u_char *,
 382                               int) __THROW;
 383 int             res_nsend (res_state, const u_char *, int, u_char *, int)
 384      __THROW;
 385 void            res_nclose (res_state) __THROW;
 386 __END_DECLS
 387 #endif
 388
 389 #endif /* !_RESOLV_H_ */