nss/nss_files/files-hosts.c

   1 /* Hosts file parser in nss_files module.
   2 Copyright (C) 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <arpa/nameser.h>
  23 #include <netdb.h>
  24 #include <resolv.h>
  25
  26
  27 /* Get implementation for some internal functions.  */
  28 #include "../resolv/mapv4v6addr.h"
  29 #include "../resolv/mapv4v6hostent.h"
  30
  31
  32 #define ENTNAME         hostent
  33 #define DATABASE        "hosts"
  34
  35 #define ENTDATA hostent_data
  36 struct hostent_data
  37   {
  38     unsigned char host_addr[16]; /* IPv4 or IPv6 address.  */
  39     char *h_addr_ptrs[2];       /* Points to that and null terminator.  */
  40   };
  41
  42 #define TRAILING_LIST_MEMBER            h_aliases
  43 #define TRAILING_LIST_SEPARATOR_P       isspace
  44 #include "files-parse.c"
  45 LINE_PARSER
  46 ("#",
  47  {
  48    char *addr;
  49
  50    STRING_FIELD (addr, isspace, 1);
  51
  52    /* Parse address.  */
  53    if ((_res.options & RES_USE_INET6)
  54        && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
  55      {
  56        result->h_addrtype = AF_INET6;
  57        result->h_length = IN6ADDRSZ;
  58      }
  59    else if (inet_pton (AF_INET, addr, entdata->host_addr) > 0)
  60      {
  61        if (_res.options & RES_USE_INET6)
  62          {
  63            map_v4v6_address ((char *) entdata->host_addr,
  64                              (char *) entdata->host_addr);
  65            result->h_addrtype = AF_INET6;
  66            result->h_length = IN6ADDRSZ;
  67          }
  68        else
  69          {
  70            result->h_addrtype = AF_INET;
  71            result->h_length = INADDRSZ;
  72          }
  73      }
  74    else
  75      /* Illegal address: ignore line.  */
  76      return 0;
  77
  78    /* Store a pointer to the address in the expected form.  */
  79    entdata->h_addr_ptrs[0] = entdata->host_addr;
  80    entdata->h_addr_ptrs[1] = NULL;
  81    result->h_addr_list = entdata->h_addr_ptrs;
  82
  83    /* If we need the host entry in IPv6 form change it now.  */
  84    if (_res.options & RES_USE_INET6)
  85      {
  86        char *bufptr = data->linebuffer;
  87        int buflen = (char *) data + datalen - bufptr;
  88        map_v4v6_hostent (result, &bufptr, &buflen);
  89      }
  90
  91    STRING_FIELD (result->h_name, isspace, 1);
  92  })
  93
  94 #include "files-XXX.c"
  95
  96 DB_LOOKUP (hostbyname, ,,
  97            LOOKUP_NAME (h_name, h_aliases),
  98            const char *name)
  99
 100 DB_LOOKUP (hostbyaddr, ,,
 101            {
 102              if (result->h_addrtype == type && result->h_length == len &&
 103                  ! memcmp (addr, result->h_addr_list[0], len))
 104                break;
 105            }, const char *addr, int len, int type)