lib/sockets.c

   1 /* sockets.c --- wrappers for Windows socket functions
   2
   3    Copyright (C) 2008-2011 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Simon Josefsson */
  19
  20 #include <config.h>
  21
  22 /* Specification.  */
  23 #include "sockets.h"
  24
  25 #if WINDOWS_SOCKETS
  26
  27 /* This includes winsock2.h on MinGW. */
  28 # include <sys/socket.h>
  29
  30 # include "fd-hook.h"
  31
  32 /* Get set_winsock_errno, FD_TO_SOCKET etc. */
  33 # include "w32sock.h"
  34
  35 static int
  36 close_fd_maybe_socket (const struct fd_hook *remaining_list,
  37                        gl_close_fn primary,
  38                        int fd)
  39 {
  40   SOCKET sock;
  41   WSANETWORKEVENTS ev;
  42
  43   /* Test whether fd refers to a socket.  */
  44   sock = FD_TO_SOCKET (fd);
  45   ev.lNetworkEvents = 0xDEADBEEF;
  46   WSAEnumNetworkEvents (sock, NULL, &ev);
  47   if (ev.lNetworkEvents != 0xDEADBEEF)
  48     {
  49       /* fd refers to a socket.  */
  50       /* FIXME: other applications, like squid, use an undocumented
  51          _free_osfhnd free function.  But this is not enough: The 'osfile'
  52          flags for fd also needs to be cleared, but it is hard to access it.
  53          Instead, here we just close twice the file descriptor.  */
  54       if (closesocket (sock))
  55         {
  56           set_winsock_errno ();
  57           return -1;
  58         }
  59       else
  60         {
  61           /* This call frees the file descriptor and does a
  62              CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails.  */
  63           _close (fd);
  64           return 0;
  65         }
  66     }
  67   else
  68     /* Some other type of file descriptor.  */
  69     return execute_close_hooks (remaining_list, primary, fd);
  70 }
  71
  72 static int
  73 ioctl_fd_maybe_socket (const struct fd_hook *remaining_list,
  74                        gl_ioctl_fn primary,
  75                        int fd, int request, void *arg)
  76 {
  77   SOCKET sock;
  78   WSANETWORKEVENTS ev;
  79
  80   /* Test whether fd refers to a socket.  */
  81   sock = FD_TO_SOCKET (fd);
  82   ev.lNetworkEvents = 0xDEADBEEF;
  83   WSAEnumNetworkEvents (sock, NULL, &ev);
  84   if (ev.lNetworkEvents != 0xDEADBEEF)
  85     {
  86       /* fd refers to a socket.  */
  87       if (ioctlsocket (sock, request, arg) < 0)
  88         {
  89           set_winsock_errno ();
  90           return -1;
  91         }
  92       else
  93         return 0;
  94     }
  95   else
  96     /* Some other type of file descriptor.  */
  97     return execute_ioctl_hooks (remaining_list, primary, fd, request, arg);
  98 }
  99
 100 static struct fd_hook fd_sockets_hook;
 101
 102 static int initialized_sockets_version /* = 0 */;
 103
 104 #endif /* WINDOWS_SOCKETS */
 105
 106 int
 107 gl_sockets_startup (int version _GL_UNUSED)
 108 {
 109 #if WINDOWS_SOCKETS
 110   if (version > initialized_sockets_version)
 111     {
 112       WSADATA data;
 113       int err;
 114
 115       err = WSAStartup (version, &data);
 116       if (err != 0)
 117         return 1;
 118
 119       if (data.wVersion < version)
 120         return 2;
 121
 122       if (initialized_sockets_version == 0)
 123         register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket,
 124                           &fd_sockets_hook);
 125
 126       initialized_sockets_version = version;
 127     }
 128 #endif
 129
 130   return 0;
 131 }
 132
 133 int
 134 gl_sockets_cleanup (void)
 135 {
 136 #if WINDOWS_SOCKETS
 137   int err;
 138
 139   initialized_sockets_version = 0;
 140
 141   unregister_fd_hook (&fd_sockets_hook);
 142
 143   err = WSACleanup ();
 144   if (err != 0)
 145     return 1;
 146 #endif
 147
 148   return 0;
 149 }