nss/nss_files/files-network.c

   1 /* Networks file parser in nss_files module.
   2    Copyright (C) 1996-2024 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 #define ENTNAME         netent
  26 #define DATABASE        "networks"
  27 #define NEED_H_ERRNO
  28
  29 struct netent_data {};
  30
  31 #define TRAILING_LIST_MEMBER            n_aliases
  32 #define TRAILING_LIST_SEPARATOR_P       isspace
  33 #include "files-parse.c"
  34 LINE_PARSER
  35 ("#",
  36  {
  37    char *addr;
  38    char *cp;
  39    int n = 1;
  40
  41    STRING_FIELD (result->n_name, isspace, 1);
  42
  43    STRING_FIELD (addr, isspace, 1);
  44    /* 'inet_network' does not add zeroes at the end if the network number
  45       does not four byte values.  We add them ourselves if necessary.  */
  46    cp = strchr (addr, '.');
  47    if (cp != NULL)
  48      {
  49        ++n;
  50        cp = strchr (cp + 1, '.');
  51        if (cp != NULL)
  52          {
  53            ++n;
  54            cp = strchr (cp + 1, '.');
  55            if (cp != NULL)
  56              ++n;
  57          }
  58      }
  59    if (n < 4)
  60      {
  61        char *newp = (char *) alloca (strlen (addr) + (4 - n) * 2 + 1);
  62        cp = stpcpy (newp, addr);
  63        do
  64          {
  65            *cp++ = '.';
  66            *cp++ = '0';
  67          }
  68        while (++n < 4);
  69        *cp = '\0';
  70        addr = newp;
  71      }
  72    result->n_net = __inet_network (addr);
  73    result->n_addrtype = AF_INET;
  74
  75  })
  76
  77 #include "files-XXX.c"
  78
  79 DB_LOOKUP (netbyname, ,,,
  80            LOOKUP_NAME_CASE (n_name, n_aliases),
  81            const char *name)
  82
  83 DB_LOOKUP (netbyaddr, ,,,
  84            {
  85              if ((type == AF_UNSPEC || result->n_addrtype == type)
  86                  && result->n_net == net)
  87                /* Bingo!  */
  88                break;
  89            }, uint32_t net, int type)