resolv/netdb.h

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it
   5    and/or modify it under the terms of the GNU Library General Public
   6    License as published by the Free Software Foundation; either
   7    version 2 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be
  10    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  11    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If
  16    not, write to the Free Software Foundation, Inc., 59 Temple Place -
  17    Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* All data returned by the network data base library are supplied in
  20    host order and returned in network order (suitable for use in
  21    system calls).  */
  22
  23 #ifndef _NETDB_H
  24 #define _NETDB_H        1
  25
  26 #include <features.h>
  27
  28 /* This is necessary to make this include file properly replace the
  29    Sun version.  */
  30 #include <rpc/netdb.h>
  31 #define __need_size_t
  32 #include <stddef.h>
  33
  34 /* Absolute file name for network data base files.  */
  35 #define _PATH_HEQUIV            "/etc/hosts.equiv"
  36 #define _PATH_HOSTS             "/etc/hosts"
  37 #define _PATH_NETWORKS          "/etc/networks"
  38 #define _PATH_NSSWITCH_CONF     "/etc/nsswitch.conf"
  39 #define _PATH_PROTOCOLS         "/etc/protocols"
  40 #define _PATH_SERVICES          "/etc/services"
  41
  42
  43 __BEGIN_DECLS
  44
  45 /* Error status for non-reentrant lookup functions.  */
  46 extern int h_errno;
  47
  48 /* Function to get address of global `h_errno' variable.  */
  49 extern int *__h_errno_location __P ((void)) __attribute__ ((__const__));
  50
  51 #ifdef _LIBC
  52 /* Retain some binary compatibility with old libraries by having both the
  53    global variable and the per-thread variable set on error.  */
  54 # ifdef _LIBC_REENTRANT
  55 static inline int
  56 __set_h_errno (int __err)
  57 {
  58   return *__h_errno_location () = h_errno = __err;
  59 }
  60 # else
  61 #  define __set_h_errno(x) (h_errno = (x))
  62 # endif /* _LIBC_REENTRANT */
  63 #endif /* _LIBC */
  64
  65
  66 #if !defined _LIBC || defined _LIBC_REENTRANT
  67 /* Use a macro to access always the thread specific `h_errno' variable.  */
  68 # define h_errno (*__h_errno_location ())
  69 #endif
  70
  71
  72 /* Possible values left in `h_errno'.  */
  73 #define NETDB_INTERNAL  -1      /* See errno.  */
  74 #define NETDB_SUCCESS   0       /* No problem.  */
  75 #define HOST_NOT_FOUND  1       /* Authoritative Answer Host not found.  */
  76 #define TRY_AGAIN       2       /* Non-Authoritative Host not found,
  77                                    or SERVERFAIL.  */
  78 #define NO_RECOVERY     3       /* Non recoverable errors, FORMERR, REFUSED,
  79                                    NOTIMP.  */
  80 #define NO_DATA         4       /* Valid name, no data record of requested
  81                                    type.  */
  82 #define NO_ADDRESS      NO_DATA /* No address, look for MX record.  */
  83
  84 /* Print error indicated by `h_errno' variable on standard error.  STR
  85    if non-null is printed before the error string.  */
  86 extern void herror __P ((__const char *__str));
  87
  88 /* Return string associated with error ERR_NUM.  */
  89 extern __const char *hstrerror __P ((int __err_num));
  90
  91
  92
  93 /* Description of data base entry for a single host.  */
  94 struct hostent
  95 {
  96   char *h_name;                 /* Official name of host.  */
  97   char **h_aliases;             /* Alias list.  */
  98   int h_addrtype;               /* Host address type.  */
  99   int h_length;                 /* Length of address.  */
 100   char **h_addr_list;           /* List of addresses from name server.  */
 101 #define h_addr  h_addr_list[0]  /* Address, for backward compatibility.  */
 102 };
 103
 104 /* Open host data base files and mark them as staying open even after
 105    a later search if STAY_OPEN is non-zero.  */
 106 extern void sethostent __P ((int __stay_open));
 107
 108 /* Close host data base files and clear `stay open' flag.  */
 109 extern void endhostent __P ((void));
 110
 111 /* Get next entry from host data base file.  Open data base if
 112    necessary.  */
 113 extern struct hostent *gethostent __P ((void));
 114
 115 /* Return entry from host data base which address match ADDR with
 116    length LEN and type TYPE.  */
 117 extern struct hostent *gethostbyaddr __P ((__const char *__addr, int __len,
 118                                            int __type));
 119
 120 /* Return entry from host data base for host with NAME.  */
 121 extern struct hostent *gethostbyname __P ((__const char *__name));
 122
 123 /* Return entry from host data base for host with NAME.  AF must be
 124    set to the address type which as `AF_INET' for IPv4 or `AF_INET6'
 125    for IPv6.  */
 126 extern struct hostent *gethostbyname2 __P ((__const char *__name, int __af));
 127
 128 #ifdef  __USE_MISC
 129 /* Reentrant versions of the functions above.  The additional
 130    arguments specify a buffer of BUFLEN starting at BUF.  The last
 131    argument is a pointer to a variable which gets the value which
 132    would be stored in the global variable `herrno' by the
 133    non-reentrant functions.  */
 134 extern int __gethostent_r __P ((struct hostent *__result_buf, char *__buf,
 135                                 size_t __buflen, struct hostent **__result,
 136                                 int *__h_errnop));
 137 extern int gethostent_r __P ((struct hostent *__result_buf, char *__buf,
 138                               size_t __buflen, struct hostent **__result,
 139                               int *__h_errnop));
 140
 141 extern int __gethostbyaddr_r __P ((__const char *__addr, int __len, int __type,
 142                                    struct hostent *__result_buf, char *__buf,
 143                                    size_t __buflen, struct hostent **__result,
 144                                    int *__h_errnop));
 145 extern int gethostbyaddr_r __P ((__const char *__addr, int __len, int __type,
 146                                  struct hostent *__result_buf, char *__buf,
 147                                  size_t __buflen, struct hostent **__result,
 148                                  int *__h_errnop));
 149
 150 extern int __gethostbyname_r __P ((__const char *__name,
 151                                    struct hostent *__result_buf, char *__buf,
 152                                    size_t __buflen, struct hostent **__result,
 153                                    int *__h_errnop));
 154 extern int gethostbyname_r __P ((__const char *__name,
 155                                  struct hostent *__result_buf, char *__buf,
 156                                  size_t __buflen, struct hostent **__result,
 157                                  int *__h_errnop));
 158
 159 extern int __gethostbyname2_r __P ((__const char *__name, int __af,
 160                                     struct hostent *__result_buf, char *__buf,
 161                                     size_t __buflen, struct hostent **__result,
 162                                     int *__h_errnop));
 163 extern int gethostbyname2_r __P ((__const char *__name, int __af,
 164                                   struct hostent *__result_buf, char *__buf,
 165                                   size_t __buflen, struct hostent **__result,
 166                                   int *__h_errnop));
 167 #endif  /* misc */
 168
 169
 170 /* Description of data base entry for a single network.  NOTE: here a
 171    poor assumption is made.  The network number is expected to fit
 172    into an unsigned long int variable.  */
 173 struct netent
 174 {
 175   char *n_name;                 /* Official name of network.  */
 176   char **n_aliases;             /* Alias list.  */
 177   int n_addrtype;               /* Net address type.  */
 178   unsigned long int n_net;      /* Network number.  */
 179 };
 180
 181 /* Open network data base files and mark them as staying open even
 182    after a later search if STAY_OPEN is non-zero.  */
 183 extern void setnetent __P ((int __stay_open));
 184
 185 /* Close network data base files and clear `stay open' flag.  */
 186 extern void endnetent __P ((void));
 187
 188 /* Get next entry from network data base file.  Open data base if
 189    necessary.  */
 190 extern struct netent *getnetent __P ((void));
 191
 192 /* Return entry from network data base which address match NET and
 193    type TYPE.  */
 194 extern struct netent *getnetbyaddr __P ((unsigned long int __net,
 195                                          int __type));
 196
 197 /* Return entry from network data base for network with NAME.  */
 198 extern struct netent *getnetbyname __P ((__const char *__name));
 199
 200 #ifdef  __USE_MISC
 201 /* Reentrant versions of the functions above.  The additional
 202    arguments specify a buffer of BUFLEN starting at BUF.  The last
 203    argument is a pointer to a variable which gets the value which
 204    would be stored in the global variable `herrno' by the
 205    non-reentrant functions.  */
 206 extern int __getnetent_r __P ((struct netent *__result_buf, char *__buf,
 207                                size_t __buflen, struct netent **__result,
 208                                int *__h_errnop));
 209 extern int getnetent_r __P ((struct netent *__result_buf, char *__buf,
 210                              size_t __buflen, struct netent **__result,
 211                              int *__h_errnop));
 212
 213 extern int __getnetbyaddr_r __P ((unsigned long int __net, int __type,
 214                                   struct netent *__result_buf, char *__buf,
 215                                   size_t __buflen, struct netent **__result,
 216                                   int *__h_errnop));
 217 extern int getnetbyaddr_r __P ((unsigned long int __net, int __type,
 218                                 struct netent *__result_buf, char *__buf,
 219                                 size_t __buflen, struct netent **__result,
 220                                 int *__h_errnop));
 221
 222 extern int __getnetbyname_r __P ((__const char *__name,
 223                                   struct netent *__result_buf, char *__buf,
 224                                   size_t __buflen, struct netent **__result,
 225                                   int *__h_errnop));
 226 extern int getnetbyname_r __P ((__const char *__name,
 227                                 struct netent *__result_buf, char *__buf,
 228                                 size_t __buflen, struct netent **__result,
 229                                 int *__h_errnop));
 230 #endif  /* misc */
 231
 232
 233 /* Description of data base entry for a single service.  */
 234 struct servent
 235 {
 236   char *s_name;                 /* Official service name.  */
 237   char **s_aliases;             /* Alias list.  */
 238   int s_port;                   /* Port number.  */
 239   char *s_proto;                /* Protocol to use.  */
 240 };
 241
 242 /* Open service data base files and mark them as staying open even
 243    after a later search if STAY_OPEN is non-zero.  */
 244 extern void setservent __P ((int __stay_open));
 245
 246 /* Close service data base files and clear `stay open' flag.  */
 247 extern void endservent __P ((void));
 248
 249 /* Get next entry from service data base file.  Open data base if
 250    necessary.  */
 251 extern struct servent *getservent __P ((void));
 252
 253 /* Return entry from network data base for network with NAME and
 254    protocol PROTO.  */
 255 extern struct servent *getservbyname __P ((__const char *__name,
 256                                            __const char *__proto));
 257
 258 /* Return entry from service data base which matches port PORT and
 259    protocol PROTO.  */
 260 extern struct servent *getservbyport __P ((int __port, __const char *__proto));
 261
 262
 263 #ifdef  __USE_MISC
 264 /* Reentrant versions of the functions above.  The additional
 265    arguments specify a buffer of BUFLEN starting at BUF.  */
 266 extern int __getservent_r __P ((struct servent *__result_buf, char *__buf,
 267                                 size_t __buflen, struct servent **__result));
 268 extern int getservent_r __P ((struct servent *__result_buf, char *__buf,
 269                               size_t __buflen, struct servent **__result));
 270
 271 extern int __getservbyname_r __P ((__const char *__name, __const char *__proto,
 272                                    struct servent *__result_buf, char *__buf,
 273                                    size_t __buflen,
 274                                    struct servent **__result));
 275 extern int getservbyname_r __P ((__const char *__name, __const char *__proto,
 276                                  struct servent *__result_buf, char *__buf,
 277                                  size_t __buflen, struct servent **__result));
 278
 279 extern int __getservbyport_r __P ((int __port, __const char *__proto,
 280                                    struct servent *__result_buf, char *__buf,
 281                                    size_t __buflen,
 282                                    struct servent **__result));
 283 extern int getservbyport_r __P ((int __port, __const char *__proto,
 284                                  struct servent *__result_buf, char *__buf,
 285                                  size_t __buflen, struct servent **__result));
 286 #endif  /* misc */
 287
 288
 289 /* Description of data base entry for a single service.  */
 290 struct protoent
 291 {
 292   char *p_name;                 /* Official protocol name.  */
 293   char **p_aliases;             /* Alias list.  */
 294   int p_proto;                  /* Protocol number.  */
 295 };
 296
 297 /* Open protocol data base files and mark them as staying open even
 298    after a later search if STAY_OPEN is non-zero.  */
 299 extern void setprotoent __P ((int __stay_open));
 300
 301 /* Close protocol data base files and clear `stay open' flag.  */
 302 extern void endprotoent __P ((void));
 303
 304 /* Get next entry from protocol data base file.  Open data base if
 305    necessary.  */
 306 extern struct protoent *getprotoent __P ((void));
 307
 308 /* Return entry from protocol data base for network with NAME.  */
 309 extern struct protoent *getprotobyname __P ((__const char *__name));
 310
 311 /* Return entry from protocol data base which number is PROTO.  */
 312 extern struct protoent *getprotobynumber __P ((int __proto));
 313
 314
 315 #ifdef  __USE_MISC
 316 /* Reentrant versions of the functions above.  The additional
 317    arguments specify a buffer of BUFLEN starting at BUF.  */
 318 extern int __getprotoent_r __P ((struct protoent *__result_buf, char *__buf,
 319                                  size_t __buflen, struct protoent **__result));
 320 extern int getprotoent_r __P ((struct protoent *__result_buf, char *__buf,
 321                                size_t __buflen, struct protoent **__result));
 322
 323 extern int __getprotobyname_r __P ((__const char *__name,
 324                                     struct protoent *__result_buf, char *__buf,
 325                                     size_t __buflen,
 326                                     struct protoent **__result));
 327 extern int getprotobyname_r __P ((__const char *__name,
 328                                   struct protoent *__result_buf, char *__buf,
 329                                   size_t __buflen,
 330                                   struct protoent **__result));
 331
 332 extern int __getprotobynumber_r __P ((int __proto, struct protoent *__res_buf,
 333                                       char *__buf, size_t __buflen,
 334                                       struct protoent **__result));
 335 extern int getprotobynumber_r __P ((int __proto, struct protoent *__result_buf,
 336                                     char *__buf, size_t __buflen,
 337                                     struct protoent **__result));
 338 #endif  /* misc */
 339
 340
 341 /* Establish network group NETGROUP for enumeration.  */
 342 extern int setnetgrent __P ((__const char *__netgroup));
 343
 344 /* Free all space allocated by previous `setnetgrent' call.  */
 345 extern void endnetgrent __P ((void));
 346
 347 /* Get next member of netgroup established by last `setnetgrent' call
 348    and return pointers to elements in HOSTP, USERP, and DOMAINP.  */
 349 extern int getnetgrent __P ((char **__hostp, char **__userp,
 350                              char **__domainp));
 351
 352 /* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).  */
 353 extern int innetgr __P ((__const char *__netgroup, __const char *__host,
 354                          __const char *__user, __const char *domain));
 355
 356 #ifdef  __USE_MISC
 357 /* Reentrant version of `getnetgrent' where result is placed in BUFFER.  */
 358 extern int __getnetgrent_r __P ((char **__hostp, char **__userp,
 359                                  char **__domainp,
 360                                  char *__buffer, size_t __buflen));
 361 extern int getnetgrent_r __P ((char **__hostp, char **__userp,
 362                                char **__domainp,
 363                                char *__buffer, size_t __buflen));
 364 #endif  /* misc */
 365
 366
 367 #ifdef __USE_BSD
 368 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
 369    The local user is LOCUSER, on the remote machine the command is
 370    executed as REMUSER.  In *FD2P the descriptor to the socket for the
 371    connection is returned.  The caller must have the right to use a
 372    reserved port.  When the function returns *AHOST contains the
 373    official host name.  */
 374 extern int rcmd __P ((char **__ahost, unsigned short int __rport,
 375                       __const char *__locuser, __const char *__remuser,
 376                       __const char *__cmd, int *__fd2p));
 377
 378 /* Call `rexecd' at port RPORT on remote machine *AHOST to execute
 379    CMD.  The process runs at the remote machine using the ID of user
 380    NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
 381    to the socket for the connection is returned.  When the function
 382    returns *AHOST contains the official host name.  */
 383 extern int rexec __P ((char **__ahost, int __rport, __const char *__name,
 384                        __const char *__pass, __const char *__cmd,
 385                        int *__fd2p));
 386
 387 /* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
 388    If SUSER is not zero the user tries to become superuser.  Return 0 if
 389    it is possible.  */
 390 extern int ruserok __P ((__const char *__rhost, int __suser,
 391                          __const char *__remuser, __const char *__locuser));
 392
 393 /* Try to allocate reserved port, returning a descriptor for a socket opened
 394    at this port or -1 if unsuccessful.  The search for an available port
 395    will start at ALPORT and continues with lower numbers.  */
 396 extern int rresvport __P ((int *__alport));
 397 #endif
 398
 399
 400 /* Extension from POSIX.1g.  */
 401 #ifdef  __USE_POSIX
 402 /* Structure to contain information about address of a service provider.  */
 403 struct addrinfo
 404 {
 405   int ai_flags;                 /* Input flags.  */
 406   int ai_family;                /* Protocol family for socket.  */
 407   int ai_socktype;              /* Socket type.  */
 408   int ai_protocol;              /* Protocol for socket.  */
 409   int ai_addrlen;               /* Length of socket address.  */
 410   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 411   char *ai_canonname;           /* Canonical name for service location.  */
 412   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 413 };
 414
 415 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 416 # define AI_PASSIVE     1       /* Socket address is intended for `bind'.  */
 417 # define AI_CANONNAME   2       /* Request for canonical name.  */
 418
 419 /* Error values for `getaddrinfo' function.  */
 420 # define EAI_BADFLAGS   -1      /* Invalid value for `ai_flags' field.  */
 421 # define EAI_NONAME     -2      /* NAME or SERVICE is unknown.  */
 422 # define EAI_AGAIN      -3      /* Temporary failure in name resolution.  */
 423 # define EAI_FAIL       -4      /* Non-recoverable failure in name res.  */
 424 # define EAI_NODATA     -5      /* No address associated with NAME.  */
 425 # define EAI_FAMILY     -6      /* `ai_family' not supported.  */
 426 # define EAI_SOCKTYPE   -7      /* `ai_socktype' not supported.  */
 427 # define EAI_SERVICE    -8      /* SERVICE not supported for `ai_socktype'.  */
 428 # define EAI_ADDRFAMILY -9      /* Address family for NAME not supported.  */
 429 # define EAI_MEMORY     -10     /* Memory allocation failure.  */
 430 # define EAI_SYSTEM     -11     /* System error returned in `errno'.  */
 431
 432 # define NI_MAXHOST      1025
 433 # define NI_MAXSERV      32
 434
 435 # define NI_NUMERICHOST 1
 436 # define NI_NUMERICSERV 2
 437 # define NI_NOFQDN 4
 438 # define NI_NAMEREQD 8
 439 # define NI_DGRAM 16
 440
 441 /* Translate name of a service location and/or a service name to set of
 442    socket addresses.  */
 443 extern int getaddrinfo __P ((__const char *__name, __const char *__service,
 444                              __const struct addrinfo *__req,
 445                              struct addrinfo **__pai));
 446
 447 /* Free `addrinfo' structure AI including associated storage.  */
 448 extern void freeaddrinfo __P ((struct addrinfo *__ai));
 449
 450 /* Convert error return from getaddrinfo() to a string.  */
 451 extern char *gai_strerror __P  ((int __ecode));
 452
 453 /* Translate a socket address to a location and service name.  */
 454 extern int getnameinfo __P ((__const struct sockaddr *__sa, size_t __salen,
 455                              char *__host, size_t __hostlen,
 456                              char *__serv, size_t __servlen,
 457                              int __flags));
 458
 459 #endif  /* POSIX */
 460
 461 __END_DECLS
 462
 463 #endif  /* netdb.h */