/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* GIO - GLib Input, Output and Streaming Library

 *

 * Copyright (C) 2011 Red Hat, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General

 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "config.h"

#include "gnetworking.h"

#ifdef G_OS_WIN32

/* For Windows XP run-time compatibility */

#include "gwin32networking.h"

GWin32WinsockFuncs ws2funcs = {0};

#endif

/**

 * SECTION:gnetworking

 * @title: gnetworking.h

 * @short_description: System networking includes

 * @include: gio/gnetworking.h

 *

 * The `<gio/gnetworking.h>` header can be included to get

 * various low-level networking-related system headers, automatically

 * taking care of certain portability issues for you.

 *

 * This can be used, for example, if you want to call setsockopt()

 * on a #GSocket.

 *

 * Note that while WinSock has many of the same APIs as the

 * traditional UNIX socket API, most of them behave at least slightly

 * differently (particularly with respect to error handling). If you

 * want your code to work under both UNIX and Windows, you will need

 * to take these differences into account.

 *

 * Also, under GNU libc, certain non-portable functions are only visible

 * in the headers if you define %_GNU_SOURCE before including them. Note

 * that this symbol must be defined before including any headers, or it

 * may not take effect.

 */

/**

 * g_networking_init:

 *

 * Initializes the platform networking libraries (eg, on Windows, this

 * calls WSAStartup()). GLib will call this itself if it is needed, so

 * you only need to call it if you directly call system networking

 * functions (without calling any GLib networking functions first).

 *

 * Since: 2.36

 */

void

g_networking_init (void)

{

#ifdef G_OS_WIN32

  static volatile gsize inited = 0;

  if (g_once_init_enter (&inited))

    {

      WSADATA wsadata;

      HMODULE ws2dll, iphlpapidll;

      if (WSAStartup (MAKEWORD (2, 0), &wsadata) != 0)

        g_error ("Windows Sockets could not be initialized");

      /* We want to use these functions if they are available, but

       * still need to make sure the code still runs on Windows XP

       */

      ws2dll = LoadLibraryW (L"ws2_32.dll");

      iphlpapidll = LoadLibraryW (L"iphlpapi.dll");

      if (ws2dll != NULL)

        {

          ws2funcs.pInetNtop =

            (PFN_InetNtop) GetProcAddress (ws2dll, "inet_ntop");

          ws2funcs.pInetPton =

            (PFN_InetPton) GetProcAddress (ws2dll, "inet_pton");

          FreeLibrary (ws2dll);

        }

      else

        {

          ws2funcs.pInetNtop = NULL;

          ws2funcs.pInetPton = NULL;

        }

      if (iphlpapidll != NULL)

        {

          ws2funcs.pIfNameToIndex =

            (PFN_IfNameToIndex) GetProcAddress (iphlpapidll, "if_nametoindex");

          FreeLibrary (iphlpapidll);

        }

      else

        ws2funcs.pIfNameToIndex = NULL;

      g_once_init_leave (&inited, 1);

    }

#endif

}