resolv/netdb.h

   1 /* Copyright (C) 1996, 1997, 1998, 1999 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 #include <sys/socket.h>         /* need socklen_t */
  32 #define __need_size_t
  33 #include <stddef.h>
  34
  35 /* Absolute file name for network data base files.  */
  36 #define _PATH_HEQUIV            "/etc/hosts.equiv"
  37 #define _PATH_HOSTS             "/etc/hosts"
  38 #define _PATH_NETWORKS          "/etc/networks"
  39 #define _PATH_NSSWITCH_CONF     "/etc/nsswitch.conf"
  40 #define _PATH_PROTOCOLS         "/etc/protocols"
  41 #define _PATH_SERVICES          "/etc/services"
  42
  43
  44 __BEGIN_DECLS
  45
  46 /* Error status for non-reentrant lookup functions.  */
  47 extern int h_errno;
  48
  49 /* Function to get address of global `h_errno' variable.  */
  50 extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));
  51
  52 #ifdef _LIBC
  53 # ifdef _LIBC_REENTRANT
  54 static inline int
  55 __set_h_errno (int __err)
  56 {
  57   return *__h_errno_location () = __err;
  58 }
  59 # else
  60 #  define __set_h_errno(x) (h_errno = (x))
  61 # endif /* _LIBC_REENTRANT */
  62 #endif /* _LIBC */
  63
  64
  65 #if !defined _LIBC || defined _LIBC_REENTRANT
  66 /* Use a macro to access always the thread specific `h_errno' variable.  */
  67 # define h_errno (*__h_errno_location ())
  68 #endif
  69
  70
  71 /* Possible values left in `h_errno'.  */
  72 #define NETDB_INTERNAL  -1      /* See errno.  */
  73 #define NETDB_SUCCESS   0       /* No problem.  */
  74 #define HOST_NOT_FOUND  1       /* Authoritative Answer Host not found.  */
  75 #define TRY_AGAIN       2       /* Non-Authoritative Host not found,
  76                                    or SERVERFAIL.  */
  77 #define NO_RECOVERY     3       /* Non recoverable errors, FORMERR, REFUSED,
  78                                    NOTIMP.  */
  79 #define NO_DATA         4       /* Valid name, no data record of requested
  80                                    type.  */
  81 #define NO_ADDRESS      NO_DATA /* No address, look for MX record.  */
  82
  83 /* Print error indicated by `h_errno' variable on standard error.  STR
  84    if non-null is printed before the error string.  */
  85 extern void herror (__const char *__str) __THROW;
  86
  87 /* Return string associated with error ERR_NUM.  */
  88 extern __const char *hstrerror (int __err_num) __THROW;
  89
  90
  91
  92 /* Description of data base entry for a single host.  */
  93 struct hostent
  94 {
  95   char *h_name;                 /* Official name of host.  */
  96   char **h_aliases;             /* Alias list.  */
  97   int h_addrtype;               /* Host address type.  */
  98   int h_length;                 /* Length of address.  */
  99   char **h_addr_list;           /* List of addresses from name server.  */
 100 #define h_addr  h_addr_list[0]  /* Address, for backward compatibility.  */
 101 };
 102
 103 /* Open host data base files and mark them as staying open even after
 104    a later search if STAY_OPEN is non-zero.  */
 105 extern void sethostent (int __stay_open) __THROW;
 106
 107 /* Close host data base files and clear `stay open' flag.  */
 108 extern void endhostent (void) __THROW;
 109
 110 /* Get next entry from host data base file.  Open data base if
 111    necessary.  */
 112 extern struct hostent *gethostent (void) __THROW;
 113
 114 /* Return entry from host data base which address match ADDR with
 115    length LEN and type TYPE.  */
 116 extern struct hostent *gethostbyaddr (__const char *__addr, size_t __len,
 117                                       int __type) __THROW;
 118
 119 /* Return entry from host data base for host with NAME.  */
 120 extern struct hostent *gethostbyname (__const char *__name) __THROW;
 121
 122 /* Return entry from host data base for host with NAME.  AF must be
 123    set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
 124    for IPv6.  */
 125 extern struct hostent *gethostbyname2 (__const char *__name, int __af) __THROW;
 126
 127 #ifdef __USE_UNIX98
 128 /* Return entry from host data base which address match ADDR with
 129    length LEN and type TYPE in newly allocated buffer.  */
 130 extern struct hostent *getipnodebyaddr (__const char *__addr, size_t __len,
 131                                         int __type, int *__error_num) __THROW;
 132
 133 /* Return entry from host data base for host with NAME and newly allocated
 134    buffer.  FLAGS is some combination of the following AI_* values.  */
 135 extern struct hostent *getipnodebyname (__const char *__name, int __type,
 136                                         int __flags, int *__error_num) __THROW;
 137
 138 # define AI_V4MAPPED    1       /* IPv4-mapped addresses are acceptable.  */
 139 # define AI_ALL         2       /* Return both IPv4 and IPv6 addresses.  */
 140 # define AI_ADDRCONFIG  4       /* Use configuration of this host to choose
 141                                    returned address type.  */
 142 # define AI_DEFAULT     (AI_V4MAPPED | AI_ADDRCONFIG)
 143
 144 /* Free structure returned by previous `getipnodebyaddr' or `getipnodebyname'
 145    call.  */
 146 extern void freehostent (struct hostent *__ptr) __THROW;
 147
 148 #endif
 149
 150 #ifdef  __USE_MISC
 151 /* Reentrant versions of the functions above.  The additional
 152    arguments specify a buffer of BUFLEN starting at BUF.  The last
 153    argument is a pointer to a variable which gets the value which
 154    would be stored in the global variable `herrno' by the
 155    non-reentrant functions.  */
 156 extern int gethostent_r (struct hostent *__restrict __result_buf,
 157                          char *__restrict __buf, size_t __buflen,
 158                          struct hostent **__restrict __result,
 159                          int *__restrict __h_errnop) __THROW;
 160
 161 extern int gethostbyaddr_r (__const char *__restrict __addr, size_t __len,
 162                             int __type,
 163                             struct hostent *__restrict __result_buf,
 164                             char *__restrict __buf, size_t __buflen,
 165                             struct hostent **__restrict __result,
 166                             int *__restrict __h_errnop) __THROW;
 167
 168 extern int gethostbyname_r (__const char *__restrict __name,
 169                             struct hostent *__restrict __result_buf,
 170                             char *__restrict __buf, size_t __buflen,
 171                             struct hostent **__restrict __result,
 172                             int *__restrict __h_errnop) __THROW;
 173
 174 extern int gethostbyname2_r (__const char *__restrict __name, int __af,
 175                              struct hostent *__restrict __result_buf,
 176                              char *__restrict __buf, size_t __buflen,
 177                              struct hostent **__restrict __result,
 178                              int *__restrict __h_errnop) __THROW;
 179 #endif  /* misc */
 180
 181
 182 /* Description of data base entry for a single network.  NOTE: here a
 183    poor assumption is made.  The network number is expected to fit
 184    into an unsigned long int variable.  */
 185 struct netent
 186 {
 187   char *n_name;                 /* Official name of network.  */
 188   char **n_aliases;             /* Alias list.  */
 189   int n_addrtype;               /* Net address type.  */
 190   unsigned long int n_net;      /* Network number.  */
 191 };
 192
 193 /* Open network data base files and mark them as staying open even
 194    after a later search if STAY_OPEN is non-zero.  */
 195 extern void setnetent (int __stay_open) __THROW;
 196
 197 /* Close network data base files and clear `stay open' flag.  */
 198 extern void endnetent (void) __THROW;
 199
 200 /* Get next entry from network data base file.  Open data base if
 201    necessary.  */
 202 extern struct netent *getnetent (void) __THROW;
 203
 204 /* Return entry from network data base which address match NET and
 205    type TYPE.  */
 206 extern struct netent *getnetbyaddr (unsigned long int __net, int __type)
 207      __THROW;
 208
 209 /* Return entry from network data base for network with NAME.  */
 210 extern struct netent *getnetbyname (__const char *__name) __THROW;
 211
 212 #ifdef  __USE_MISC
 213 /* Reentrant versions of the functions above.  The additional
 214    arguments specify a buffer of BUFLEN starting at BUF.  The last
 215    argument is a pointer to a variable which gets the value which
 216    would be stored in the global variable `herrno' by the
 217    non-reentrant functions.  */
 218 extern int getnetent_r (struct netent *__restrict __result_buf,
 219                         char *__restrict __buf, size_t __buflen,
 220                         struct netent **__restrict __result,
 221                         int *__restrict __h_errnop) __THROW;
 222
 223 extern int getnetbyaddr_r (unsigned long int __net, int __type,
 224                            struct netent *__restrict __result_buf,
 225                            char *__restrict __buf, size_t __buflen,
 226                            struct netent **__restrict __result,
 227                            int *__restrict __h_errnop) __THROW;
 228
 229 extern int getnetbyname_r (__const char *__restrict __name,
 230                            struct netent *__restrict __result_buf,
 231                            char *__restrict __buf, size_t __buflen,
 232                            struct netent **__restrict __result,
 233                            int *__restrict __h_errnop) __THROW;
 234 #endif  /* misc */
 235
 236
 237 /* Description of data base entry for a single service.  */
 238 struct servent
 239 {
 240   char *s_name;                 /* Official service name.  */
 241   char **s_aliases;             /* Alias list.  */
 242   int s_port;                   /* Port number.  */
 243   char *s_proto;                /* Protocol to use.  */
 244 };
 245
 246 /* Open service data base files and mark them as staying open even
 247    after a later search if STAY_OPEN is non-zero.  */
 248 extern void setservent (int __stay_open) __THROW;
 249
 250 /* Close service data base files and clear `stay open' flag.  */
 251 extern void endservent (void) __THROW;
 252
 253 /* Get next entry from service data base file.  Open data base if
 254    necessary.  */
 255 extern struct servent *getservent (void) __THROW;
 256
 257 /* Return entry from network data base for network with NAME and
 258    protocol PROTO.  */
 259 extern struct servent *getservbyname (__const char *__name,
 260                                       __const char *__proto) __THROW;
 261
 262 /* Return entry from service data base which matches port PORT and
 263    protocol PROTO.  */
 264 extern struct servent *getservbyport (int __port, __const char *__proto)
 265      __THROW;
 266
 267
 268 #ifdef  __USE_MISC
 269 /* Reentrant versions of the functions above.  The additional
 270    arguments specify a buffer of BUFLEN starting at BUF.  */
 271 extern int getservent_r (struct servent *__restrict __result_buf,
 272                          char *__restrict __buf, size_t __buflen,
 273                          struct servent **__restrict __result) __THROW;
 274
 275 extern int getservbyname_r (__const char *__restrict __name,
 276                             __const char *__restrict __proto,
 277                             struct servent *__restrict __result_buf,
 278                             char *__restrict __buf, size_t __buflen,
 279                             struct servent **__restrict __result) __THROW;
 280
 281 extern int getservbyport_r (int __port, __const char *__restrict __proto,
 282                             struct servent *__restrict __result_buf,
 283                             char *__restrict __buf, size_t __buflen,
 284                             struct servent **__restrict __result) __THROW;
 285 #endif  /* misc */
 286
 287
 288 /* Description of data base entry for a single service.  */
 289 struct protoent
 290 {
 291   char *p_name;                 /* Official protocol name.  */
 292   char **p_aliases;             /* Alias list.  */
 293   int p_proto;                  /* Protocol number.  */
 294 };
 295
 296 /* Open protocol data base files and mark them as staying open even
 297    after a later search if STAY_OPEN is non-zero.  */
 298 extern void setprotoent (int __stay_open) __THROW;
 299
 300 /* Close protocol data base files and clear `stay open' flag.  */
 301 extern void endprotoent (void) __THROW;
 302
 303 /* Get next entry from protocol data base file.  Open data base if
 304    necessary.  */
 305 extern struct protoent *getprotoent (void) __THROW;
 306
 307 /* Return entry from protocol data base for network with NAME.  */
 308 extern struct protoent *getprotobyname (__const char *__name) __THROW;
 309
 310 /* Return entry from protocol data base which number is PROTO.  */
 311 extern struct protoent *getprotobynumber (int __proto) __THROW;
 312
 313
 314 #ifdef  __USE_MISC
 315 /* Reentrant versions of the functions above.  The additional
 316    arguments specify a buffer of BUFLEN starting at BUF.  */
 317 extern int getprotoent_r (struct protoent *__restrict __result_buf,
 318                           char *__restrict __buf, size_t __buflen,
 319                           struct protoent **__restrict __result) __THROW;
 320
 321 extern int getprotobyname_r (__const char *__restrict __name,
 322                              struct protoent *__restrict __result_buf,
 323                              char *__restrict __buf, size_t __buflen,
 324                              struct protoent **__restrict __result) __THROW;
 325
 326 extern int getprotobynumber_r (int __proto,
 327                                struct protoent *__restrict __result_buf,
 328                                char *__restrict __buf, size_t __buflen,
 329                                struct protoent **__restrict __result) __THROW;
 330 #endif  /* misc */
 331
 332
 333 /* Establish network group NETGROUP for enumeration.  */
 334 extern int setnetgrent (__const char *__netgroup) __THROW;
 335
 336 /* Free all space allocated by previous `setnetgrent' call.  */
 337 extern void endnetgrent (void) __THROW;
 338
 339 /* Get next member of netgroup established by last `setnetgrent' call
 340    and return pointers to elements in HOSTP, USERP, and DOMAINP.  */
 341 extern int getnetgrent (char **__restrict __hostp,
 342                         char **__restrict __userp,
 343                         char **__restrict __domainp) __THROW;
 344
 345 /* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).  */
 346 extern int innetgr (__const char *__netgroup, __const char *__host,
 347                     __const char *__user, __const char *domain) __THROW;
 348
 349 #ifdef  __USE_MISC
 350 /* Reentrant version of `getnetgrent' where result is placed in BUFFER.  */
 351 extern int getnetgrent_r (char **__restrict __hostp,
 352                           char **__restrict __userp,
 353                           char **__restrict __domainp,
 354                           char *__restrict __buffer, size_t __buflen) __THROW;
 355 #endif  /* misc */
 356
 357
 358 #ifdef __USE_BSD
 359 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
 360    The local user is LOCUSER, on the remote machine the command is
 361    executed as REMUSER.  In *FD2P the descriptor to the socket for the
 362    connection is returned.  The caller must have the right to use a
 363    reserved port.  When the function returns *AHOST contains the
 364    official host name.  */
 365 extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
 366                  __const char *__restrict __locuser,
 367                  __const char *__restrict __remuser,
 368                  __const char *__restrict __cmd, int *__restrict __fd2p)
 369      __THROW;
 370
 371 /* Call `rexecd' at port RPORT on remote machine *AHOST to execute
 372    CMD.  The process runs at the remote machine using the ID of user
 373    NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
 374    to the socket for the connection is returned.  When the function
 375    returns *AHOST contains the official host name.  */
 376 extern int rexec (char **__restrict __ahost, int __rport,
 377                   __const char *__restrict __name,
 378                   __const char *__restrict __pass,
 379                   __const char *__restrict __cmd, int *__restrict __fd2p)
 380      __THROW;
 381
 382 /* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
 383    If SUSER is not zero the user tries to become superuser.  Return 0 if
 384    it is possible.  */
 385 extern int ruserok (__const char *__rhost, int __suser,
 386                     __const char *__remuser, __const char *__locuser) __THROW;
 387
 388 /* Try to allocate reserved port, returning a descriptor for a socket opened
 389    at this port or -1 if unsuccessful.  The search for an available port
 390    will start at ALPORT and continues with lower numbers.  */
 391 extern int rresvport (int *__alport) __THROW;
 392 #endif
 393
 394
 395 /* Extension from POSIX.1g.  */
 396 #ifdef  __USE_POSIX
 397 /* Structure to contain information about address of a service provider.  */
 398 struct addrinfo
 399 {
 400   int ai_flags;                 /* Input flags.  */
 401   int ai_family;                /* Protocol family for socket.  */
 402   int ai_socktype;              /* Socket type.  */
 403   int ai_protocol;              /* Protocol for socket.  */
 404   int ai_addrlen;               /* Length of socket address.  */
 405   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 406   char *ai_canonname;           /* Canonical name for service location.  */
 407   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 408 };
 409
 410 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 411 # define AI_PASSIVE     1       /* Socket address is intended for `bind'.  */
 412 # define AI_CANONNAME   2       /* Request for canonical name.  */
 413 # define AI_NUMERICHOST 4       /* Don't use name resolution.  */
 414
 415 /* Error values for `getaddrinfo' function.  */
 416 # define EAI_BADFLAGS   -1      /* Invalid value for `ai_flags' field.  */
 417 # define EAI_NONAME     -2      /* NAME or SERVICE is unknown.  */
 418 # define EAI_AGAIN      -3      /* Temporary failure in name resolution.  */
 419 # define EAI_FAIL       -4      /* Non-recoverable failure in name res.  */
 420 # define EAI_NODATA     -5      /* No address associated with NAME.  */
 421 # define EAI_FAMILY     -6      /* `ai_family' not supported.  */
 422 # define EAI_SOCKTYPE   -7      /* `ai_socktype' not supported.  */
 423 # define EAI_SERVICE    -8      /* SERVICE not supported for `ai_socktype'.  */
 424 # define EAI_ADDRFAMILY -9      /* Address family for NAME not supported.  */
 425 # define EAI_MEMORY     -10     /* Memory allocation failure.  */
 426 # define EAI_SYSTEM     -11     /* System error returned in `errno'.  */
 427
 428 # define NI_MAXHOST      1025
 429 # define NI_MAXSERV      32
 430
 431 # define NI_NUMERICHOST 1       /* Don't try to look up hostname.  */
 432 # define NI_NUMERICSERV 2       /* Don't convert port number to name.  */
 433 # define NI_NOFQDN      4       /* Only return nodename portion.  */
 434 # define NI_NAMEREQD    8       /* Don't return numeric addresses.  */
 435 # define NI_DGRAM       16      /* Look up UDP service rather than TCP.  */
 436
 437 /* Translate name of a service location and/or a service name to set of
 438    socket addresses.  */
 439 extern int getaddrinfo (__const char *__restrict __name,
 440                         __const char *__restrict __service,
 441                         __const struct addrinfo *__restrict __req,
 442                         struct addrinfo **__restrict __pai) __THROW;
 443
 444 /* Free `addrinfo' structure AI including associated storage.  */
 445 extern void freeaddrinfo (struct addrinfo *__ai) __THROW;
 446
 447 /* Convert error return from getaddrinfo() to a string.  */
 448 extern char *gai_strerror (int __ecode) __THROW;
 449
 450 /* Translate a socket address to a location and service name.  */
 451 extern int getnameinfo (__const struct sockaddr *__restrict __sa,
 452                         socklen_t __salen, char *__restrict __host,
 453                         size_t __hostlen, char *__restrict __serv,
 454                         size_t __servlen, int __flags) __THROW;
 455
 456 #endif  /* POSIX */
 457
 458 __END_DECLS
 459
 460 #endif  /* netdb.h */