nss/nss_files/files-network.c

   1 /* Networks file parser in nss_files module.
   2    Copyright (C) 1996-2020 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <netdb.h>
  22 #include <stdint.h>
  23 #include <nss.h>
  24
  25 NSS_DECLARE_MODULE_FUNCTIONS (files)
  26
  27 #define ENTNAME         netent
  28 #define DATABASE        "networks"
  29 #define NEED_H_ERRNO
  30
  31 struct netent_data {};
  32
  33 #define TRAILING_LIST_MEMBER            n_aliases
  34 #define TRAILING_LIST_SEPARATOR_P       isspace
  35 #include "files-parse.c"
  36 LINE_PARSER
  37 ("#",
  38  {
  39    char *addr;
  40    char *cp;
  41    int n = 1;
  42
  43    STRING_FIELD (result->n_name, isspace, 1);
  44
  45    STRING_FIELD (addr, isspace, 1);
  46    /* 'inet_network' does not add zeroes at the end if the network number
  47       does not four byte values.  We add them outselves if necessary.  */
  48    cp = strchr (addr, '.');
  49    if (cp != NULL)
  50      {
  51        ++n;
  52        cp = strchr (cp + 1, '.');
  53        if (cp != NULL)
  54          {
  55            ++n;
  56            cp = strchr (cp + 1, '.');
  57            if (cp != NULL)
  58              ++n;
  59          }
  60      }
  61    if (n < 4)
  62      {
  63        char *newp = (char *) alloca (strlen (addr) + (4 - n) * 2 + 1);
  64        cp = stpcpy (newp, addr);
  65        do
  66          {
  67            *cp++ = '.';
  68            *cp++ = '0';
  69          }
  70        while (++n < 4);
  71        *cp = '\0';
  72        addr = newp;
  73      }
  74    result->n_net = inet_network (addr);
  75    result->n_addrtype = AF_INET;
  76
  77  })
  78
  79 #include "files-XXX.c"
  80
  81 DB_LOOKUP (netbyname, ,,,
  82            LOOKUP_NAME_CASE (n_name, n_aliases),
  83            const char *name)
  84
  85 DB_LOOKUP (netbyaddr, ,,,
  86            {
  87              if ((type == AF_UNSPEC || result->n_addrtype == type)
  88                  && result->n_net == net)
  89                /* Bingo!  */
  90                break;
  91            }, uint32_t net, int type)