glibc-compat/nss_files/files-hosts.c

   1 /* Hosts file parser in nss_files module.
   2    Copyright (C) 1996, 1997, 1998 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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <arpa/nameser.h>
  23 #include <glibc-compat/include/netdb.h>
  24 #include <resolv.h>
  25
  26
  27 /* Get implementation for some internal functions.  */
  28 #include "../resolv/mapv4v6addr.h"
  29
  30
  31 #define ENTNAME         hostent
  32 #define DATABASE        "hosts"
  33 #define NEED_H_ERRNO
  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 (inet_pton (AF_INET, addr, entdata->host_addr) > 0)
  54      {
  55        if (_res.options & RES_USE_INET6)
  56          {
  57            map_v4v6_address ((char *) entdata->host_addr,
  58                              (char *) entdata->host_addr);
  59            result->h_addrtype = AF_INET6;
  60            result->h_length = IN6ADDRSZ;
  61          }
  62        else
  63          {
  64            result->h_addrtype = AF_INET;
  65            result->h_length = INADDRSZ;
  66          }
  67      }
  68    else if (inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
  69      {
  70        result->h_addrtype = AF_INET6;
  71        result->h_length = IN6ADDRSZ;
  72      }
  73    else
  74      /* Illegal address: ignore line.  */
  75      return 0;
  76
  77    /* Store a pointer to the address in the expected form.  */
  78    entdata->h_addr_ptrs[0] = entdata->host_addr;
  79    entdata->h_addr_ptrs[1] = NULL;
  80    result->h_addr_list = entdata->h_addr_ptrs;
  81
  82    STRING_FIELD (result->h_name, isspace, 1);
  83  })
  84
  85 #include "files-XXX.c"
  86
  87 DB_LOOKUP (hostbyname, ,,
  88            {
  89              if (result->h_addrtype != ((_res.options & RES_USE_INET6)
  90                                         ? AF_INET6 : AF_INET))
  91                continue;
  92              LOOKUP_NAME_CASE (h_name, h_aliases)
  93            }, const char *name)
  94
  95 DB_LOOKUP (hostbyname2, ,,
  96            {
  97              if (result->h_addrtype != af)
  98                continue;
  99              LOOKUP_NAME_CASE (h_name, h_aliases)
 100            }, const char *name, int af)
 101
 102 DB_LOOKUP (hostbyaddr, ,,
 103            {
 104              if (result->h_addrtype == type && result->h_length == len &&
 105                  ! memcmp (addr, result->h_addr_list[0], len))
 106                break;
 107            }, const char *addr, int len, int type)