nss/nss_files/files-network.c

   1 /* Networks file parser in nss_files module.
   2    Copyright (C) 1996-2017 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <netdb.h>
  22 #include <stdint.h>
  23
  24 #define ENTNAME         netent
  25 #define DATABASE        "networks"
  26 #define NEED_H_ERRNO
  27
  28 struct netent_data {};
  29
  30 #define TRAILING_LIST_MEMBER            n_aliases
  31 #define TRAILING_LIST_SEPARATOR_P       isspace
  32 #include "files-parse.c"
  33 LINE_PARSER
  34 ("#",
  35  {
  36    char *addr;
  37    char *cp;
  38    int n = 1;
  39
  40    STRING_FIELD (result->n_name, isspace, 1);
  41
  42    STRING_FIELD (addr, isspace, 1);
  43    /* 'inet_network' does not add zeroes at the end if the network number
  44       does not four byte values.  We add them outselves if necessary.  */
  45    cp = strchr (addr, '.');
  46    if (cp != NULL)
  47      {
  48        ++n;
  49        cp = strchr (cp + 1, '.');
  50        if (cp != NULL)
  51          {
  52            ++n;
  53            cp = strchr (cp + 1, '.');
  54            if (cp != NULL)
  55              ++n;
  56          }
  57      }
  58    if (n < 4)
  59      {
  60        char *newp = (char *) alloca (strlen (addr) + (4 - n) * 2 + 1);
  61        cp = stpcpy (newp, addr);
  62        do
  63          {
  64            *cp++ = '.';
  65            *cp++ = '0';
  66          }
  67        while (++n < 4);
  68        *cp = '\0';
  69        addr = newp;
  70      }
  71    result->n_net = inet_network (addr);
  72    result->n_addrtype = AF_INET;
  73
  74  })
  75
  76 #include "files-XXX.c"
  77
  78 DB_LOOKUP (netbyname, ,,,
  79            LOOKUP_NAME_CASE (n_name, n_aliases),
  80            const char *name)
  81
  82 DB_LOOKUP (netbyaddr, ,,,
  83            {
  84              if ((type == AF_UNSPEC || result->n_addrtype == type)
  85                  && result->n_net == net)
  86                /* Bingo!  */
  87                break;
  88            }, uint32_t net, int type)