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 #define _RESOLV_H_
  54
  55 #include <sys/param.h>
  56 #if (!defined(BSD)) || (BSD < 199306)
  57 # include <sys/bitypes.h>
  58 #else
  59 # include <sys/types.h>
  60 #endif
  61 #include <sys/cdefs.h>
  62 #include <stdio.h>
  63
  64 #include <netinet/in.h>
  65 #include <arpa/nameser.h>
  66
  67 /*
  68  * Revision information.  This is the release date in YYYYMMDD format.
  69  * It can change every day so the right thing to do with it is use it
  70  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  71  * compare for equality; rather, use it to determine whether your resolver
  72  * is new enough to contain a certain feature.
  73  */
  74
  75 #define __RES   19991006
  76
  77 /*
  78  * Resolver configuration file.
  79  * Normally not present, but may contain the address of the
  80  * inital name server(s) to query and the domain search list.
  81  */
  82
  83 #ifndef _PATH_RESCONF
  84 #define _PATH_RESCONF        "/etc/resolv.conf"
  85 #endif
  86
  87 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
  88         res_sendhookact;
  89
  90 typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
  91                                            const u_char **query,
  92                                            int *querylen,
  93                                            u_char *ans,
  94                                            int anssiz,
  95                                            int *resplen);
  96
  97 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
  98                                            const u_char *query,
  99                                            int querylen,
 100                                            u_char *ans,
 101                                            int anssiz,
 102                                            int *resplen);
 103
 104 struct res_sym {
 105         int     number;         /* Identifying number, like T_MX */
 106         char *  name;           /* Its symbolic name, like "MX" */
 107         char *  humanname;      /* Its fun name, like "mail exchanger" */
 108 };
 109
 110 /*
 111  * Global defines and variables for resolver stub.
 112  */
 113 #define MAXNS                   3       /* max # name servers we'll track */
 114 #define MAXDFLSRCH              3       /* # default domain levels to try */
 115 #define MAXDNSRCH               6       /* max # domains in search path */
 116 #define LOCALDOMAINPARTS        2       /* min levels in name that is "local" */
 117
 118 #define RES_TIMEOUT             5       /* min. seconds between retries */
 119 #define MAXRESOLVSORT           10      /* number of net to sort on */
 120 #define RES_MAXNDOTS            15      /* should reflect bit field size */
 121 #define RES_MAXRETRANS          30      /* only for resolv.conf/RES_OPTIONS */
 122 #define RES_MAXRETRY            5       /* only for resolv.conf/RES_OPTIONS */
 123 #define RES_DFLRETRY            2       /* Default #/tries. */
 124 #define RES_MAXTIME             65535   /* Infinity, in milliseconds. */
 125
 126 struct __res_state {
 127         int     retrans;                /* retransmition time interval */
 128         int     retry;                  /* number of times to retransmit */
 129         u_long  options;                /* option flags - see below. */
 130         int     nscount;                /* number of name servers */
 131         struct sockaddr_in
 132                 nsaddr_list[MAXNS];     /* address of name server */
 133 #define nsaddr  nsaddr_list[0]          /* for backward compatibility */
 134         u_short id;                     /* current message id */
 135         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
 136         char    defdname[256];          /* default domain (deprecated) */
 137         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
 138         unsigned ndots:4;               /* threshold for initial abs. query */
 139         unsigned nsort:4;               /* number of elements in sort_list[] */
 140         char    unused[3];
 141         struct {
 142                 struct in_addr  addr;
 143                 u_int32_t       mask;
 144         } sort_list[MAXRESOLVSORT];
 145         res_send_qhook qhook;           /* query hook */
 146         res_send_rhook rhook;           /* response hook */
 147         int     res_h_errno;            /* last one set for this context */
 148         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
 149         u_int   _flags;                 /* PRIVATE: see below */
 150         union {
 151                 char    pad[52];        /* On an i386 this means 512b total. */
 152                 struct {
 153                         u_int16_t               nscount;
 154                         u_int16_t               nstimes[MAXNS]; /* ms. */
 155                         int                     nssocks[MAXNS];
 156                         u_int16_t               nscount6;
 157                         struct sockaddr_in6     *nsaddrs[MAXNS];
 158                 } _ext;
 159         } _u;
 160 };
 161
 162 typedef struct __res_state *res_state;
 163
 164 /*
 165  * Resolver flags (used to be discrete per-module statics ints).
 166  */
 167 #define RES_F_VC        0x00000001      /* socket is TCP */
 168 #define RES_F_CONN      0x00000002      /* socket is connected */
 169
 170 /* res_findzonecut() options */
 171 #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
 172
 173 /*
 174  * Resolver options (keep these in synch with res_debug.c, please)
 175  */
 176 #define RES_INIT        0x00000001      /* address initialized */
 177 #define RES_DEBUG       0x00000002      /* print debug messages */
 178 #define RES_AAONLY      0x00000004      /* authoritative answers only (!IMPL)*/
 179 #define RES_USEVC       0x00000008      /* use virtual circuit */
 180 #define RES_PRIMARY     0x00000010      /* query primary server only (!IMPL) */
 181 #define RES_IGNTC       0x00000020      /* ignore trucation errors */
 182 #define RES_RECURSE     0x00000040      /* recursion desired */
 183 #define RES_DEFNAMES    0x00000080      /* use default domain name */
 184 #define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */
 185 #define RES_DNSRCH      0x00000200      /* search up local domain tree */
 186 #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
 187 #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
 188 #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
 189 #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
 190 #define RES_ROTATE      0x00004000      /* rotate ns list after each query */
 191 #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 192 #define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
 193 #define RES_BLAST       0x00020000      /* blast all recursive servers */
 194
 195 #define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
 196
 197 /*
 198  * Resolver "pfcode" values.  Used by dig.
 199  */
 200 #define RES_PRF_STATS   0x00000001
 201 #define RES_PRF_UPDATE  0x00000002
 202 #define RES_PRF_CLASS   0x00000004
 203 #define RES_PRF_CMD     0x00000008
 204 #define RES_PRF_QUES    0x00000010
 205 #define RES_PRF_ANS     0x00000020
 206 #define RES_PRF_AUTH    0x00000040
 207 #define RES_PRF_ADD     0x00000080
 208 #define RES_PRF_HEAD1   0x00000100
 209 #define RES_PRF_HEAD2   0x00000200
 210 #define RES_PRF_TTLID   0x00000400
 211 #define RES_PRF_HEADX   0x00000800
 212 #define RES_PRF_QUERY   0x00001000
 213 #define RES_PRF_REPLY   0x00002000
 214 #define RES_PRF_INIT    0x00004000
 215 /*                      0x00008000      */
 216
 217 /* Things involving an internal (static) resolver context. */
 218 #if !defined _LIBC || defined _LIBC_REENTRANT
 219 __BEGIN_DECLS
 220 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
 221 __END_DECLS
 222 #define _res (*__res_state())
 223 #else
 224 #ifndef __BIND_NOSTATIC
 225 extern struct __res_state _res;
 226 #endif
 227 #endif
 228
 229 #ifndef __BIND_NOSTATIC
 230 #define fp_nquery               __fp_nquery
 231 #define fp_query                __fp_query
 232 #define hostalias               __hostalias
 233 #define p_query                 __p_query
 234 #define res_close               __res_close
 235 #define res_init                __res_init
 236 #define res_isourserver         __res_isourserver
 237 #define res_mkquery             __res_mkquery
 238 #define res_query               __res_query
 239 #define res_querydomain         __res_querydomain
 240 #define res_search              __res_search
 241 #define res_send                __res_send
 242
 243 __BEGIN_DECLS
 244 void            fp_nquery __P((const u_char *, int, FILE *));
 245 void            fp_query __P((const u_char *, FILE *));
 246 const char *    hostalias __P((const char *));
 247 void            p_query __P((const u_char *));
 248 void            res_close __P((void));
 249 int             res_init __P((void));
 250 int             res_isourserver __P((const struct sockaddr_in *));
 251 int             res_mkquery __P((int, const char *, int, int, const u_char *,
 252                                  int, const u_char *, u_char *, int));
 253 int             res_query __P((const char *, int, int, u_char *, int));
 254 int             res_querydomain __P((const char *, const char *, int, int,
 255                                      u_char *, int));
 256 int             res_search __P((const char *, int, int, u_char *, int));
 257 int             res_send __P((const u_char *, int, u_char *, int));
 258 __END_DECLS
 259 #endif
 260
 261 #if !defined(SHARED_LIBBIND) || defined(LIB)
 262 /*
 263  * If libbind is a shared object (well, DLL anyway)
 264  * these externs break the linker when resolv.h is
 265  * included by a lib client (like named)
 266  * Make them go away if a client is including this
 267  *
 268  */
 269 extern const struct res_sym __p_key_syms[];
 270 extern const struct res_sym __p_cert_syms[];
 271 extern const struct res_sym __p_class_syms[];
 272 extern const struct res_sym __p_type_syms[];
 273 extern const struct res_sym __p_rcode_syms[];
 274 #endif /* SHARED_LIBBIND */
 275
 276 #define b64_ntop                __b64_ntop
 277 #define b64_pton                __b64_pton
 278 #define dn_comp                 __dn_comp
 279 #define dn_count_labels         __dn_count_labels
 280 #define dn_expand               __dn_expand
 281 #define dn_skipname             __dn_skipname
 282 #define fp_resstat              __fp_resstat
 283 #define loc_aton                __loc_aton
 284 #define loc_ntoa                __loc_ntoa
 285 #define p_cdname                __p_cdname
 286 #define p_cdnname               __p_cdnname
 287 #define p_class                 __p_class
 288 #define p_fqname                __p_fqname
 289 #define p_fqnname               __p_fqnname
 290 #define p_option                __p_option
 291 #define p_secstodate            __p_secstodate
 292 #define p_section               __p_section
 293 #define p_time                  __p_time
 294 #define p_type                  __p_type
 295 #define p_rcode                 __p_rcode
 296 #define putlong                 __putlong
 297 #define putshort                __putshort
 298 #define res_dnok                __res_dnok
 299 #define res_hnok                __res_hnok
 300 #define res_hostalias           __res_hostalias
 301 #define res_mailok              __res_mailok
 302 #define res_nameinquery         __res_nameinquery
 303 #define res_nclose              __res_nclose
 304 #define res_ninit               __res_ninit
 305 #define res_nmkquery            __res_nmkquery
 306 #define res_npquery             __res_npquery
 307 #define res_nquery              __res_nquery
 308 #define res_nquerydomain        __res_nquerydomain
 309 #define res_nsearch             __res_nsearch
 310 #define res_nsend               __res_nsend
 311 #define res_nisourserver        __res_nisourserver
 312 #define res_ownok               __res_ownok
 313 #define res_queriesmatch        __res_queriesmatch
 314 #define res_randomid            __res_randomid
 315 #define sym_ntop                __sym_ntop
 316 #define sym_ntos                __sym_ntos
 317 #define sym_ston                __sym_ston
 318 __BEGIN_DECLS
 319 int             res_hnok __P((const char *));
 320 int             res_ownok __P((const char *));
 321 int             res_mailok __P((const char *));
 322 int             res_dnok __P((const char *));
 323 int             sym_ston __P((const struct res_sym *, const char *, int *));
 324 const char *    sym_ntos __P((const struct res_sym *, int, int *));
 325 const char *    sym_ntop __P((const struct res_sym *, int, int *));
 326 int             b64_ntop __P((u_char const *, size_t, char *, size_t));
 327 int             b64_pton __P((char const *, u_char *, size_t));
 328 int             loc_aton __P((const char *ascii, u_char *binary));
 329 const char *    loc_ntoa __P((const u_char *binary, char *ascii));
 330 int             dn_skipname __P((const u_char *, const u_char *));
 331 void            putlong __P((u_int32_t, u_char *));
 332 void            putshort __P((u_int16_t, u_char *));
 333 const char *    p_class __P((int));
 334 const char *    p_time __P((u_int32_t));
 335 const char *    p_type __P((int));
 336 const char *    p_rcode __P((int));
 337 const u_char *  p_cdnname __P((const u_char *, const u_char *, int, FILE *));
 338 const u_char *  p_cdname __P((const u_char *, const u_char *, FILE *));
 339 const u_char *  p_fqnname __P((const u_char *cp, const u_char *msg,
 340                                int, char *, int));
 341 const u_char *  p_fqname __P((const u_char *, const u_char *, FILE *));
 342 const char *    p_option __P((u_long option));
 343 char *          p_secstodate __P((u_long));
 344 int             dn_count_labels __P((const char *));
 345 int             dn_comp __P((const char *, u_char *, int,
 346                              u_char **, u_char **));
 347 int             dn_expand __P((const u_char *, const u_char *, const u_char *,
 348                                char *, int));
 349 u_int           res_randomid __P((void));
 350 int             res_nameinquery __P((const char *, int, int,
 351                                      const u_char *, const u_char *));
 352 int             res_queriesmatch __P((const u_char *, const u_char *,
 353                                       const u_char *, const u_char *));
 354 const char *    p_section __P((int section, int opcode));
 355 /* Things involving a resolver context. */
 356 int             res_ninit __P((res_state));
 357 int             res_nisourserver __P((const res_state,
 358                                       const struct sockaddr_in *));
 359 void            fp_resstat __P((const res_state, FILE *));
 360 void            res_npquery __P((const res_state, const u_char *, int, FILE *));
 361 const char *    res_hostalias __P((const res_state, const char *,
 362                                    char *, size_t));
 363 int             res_nquery __P((res_state,
 364                                 const char *, int, int, u_char *, int));
 365 int             res_nsearch __P((res_state, const char *, int,
 366                                  int, u_char *, int));
 367 int             res_nquerydomain __P((res_state,
 368                                       const char *, const char *, int, int,
 369                                       u_char *, int));
 370 int             res_nmkquery __P((res_state,
 371                                   int, const char *, int, int, const u_char *,
 372                                   int, const u_char *, u_char *, int));
 373 int             res_nsend __P((res_state, const u_char *, int, u_char *, int));
 374 void            res_nclose __P((res_state));
 375 __END_DECLS
 376
 377 #endif /* !_RESOLV_H_ */