win32.c


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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * Win32-specific OpenVPN code, targetted at the mingw
 * development environment.
 */
#include "syshead.h"

#ifdef WIN32

#include "buffer.h"
#include "error.h"
#include "mtu.h"
#include "sig.h"
#include "win32.h"
#include "misc.h"

#include "memdbg.h"

/*
 * Windows internal socket API state (opaque).
 */
static struct WSAData wsa_state; /* GLOBAL */

/*
 * Should we call win32_pause() on program exit?
 */
static bool pause_exit_enabled = false; /* GLOBAL */

/*
 * win32_signal is used to get input from the keyboard
 * if we are running in a console, or get input from an
 * event object if we are running as a service.
 */

struct win32_signal win32_signal; /* GLOBAL */

/*
 * Save our old window title so we can restore
 * it on exit.
 */
struct window_title window_title; /* GLOBAL*/

/*
 * Special global semaphore used to protect network
 * shell commands from simultaneous instantiation.
 */

struct semaphore netcmd_semaphore; /* GLOBAL */

/*
 * Windows system pathname such as c:\windows
 */
static char *win_sys_path = NULL; /* GLOBAL */

/*
 * Configure PATH.  On Windows, sometimes PATH is not set correctly
 * by default.
 */
static void
configure_win_path (void)
{
  static bool done = false; /* GLOBAL */
  if (!done)
    {
      FILE *fp;
      fp = fopen ("c:\\windows\\system32\\route.exe", "rb");
      if (fp)
	{
	  const int bufsiz = 4096;
	  struct gc_arena gc = gc_new ();
	  struct buffer oldpath = alloc_buf_gc (bufsiz, &gc);
	  struct buffer newpath = alloc_buf_gc (bufsiz, &gc);
	  const char* delim = ";";
	  DWORD status;
	  fclose (fp);
	  status = GetEnvironmentVariable ("PATH", BPTR(&oldpath), (DWORD)BCAP(&oldpath));
#if 0
	  status = 0;
#endif
	  if (!status)
	    {
	      *BPTR(&oldpath) = '\0';
	      delim = "";
	    }
	  buf_printf (&newpath, "C:\\WINDOWS\\System32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem%s%s",
		      delim,
		      BSTR(&oldpath));
	  SetEnvironmentVariable ("PATH", BSTR(&newpath));
#if 0
	  status = GetEnvironmentVariable ("PATH", BPTR(&oldpath), (DWORD)BCAP(&oldpath));
	  if (status > 0)
	    printf ("PATH: %s\n", BSTR(&oldpath));
#endif
	  gc_free (&gc);
	  done = true;
	}
    }
}

void
init_win32 (void)
{
  if (WSAStartup(0x0101, &wsa_state))
    {
      msg (M_ERR, "WSAStartup failed");
    }
  window_title_clear (&window_title);
  win32_signal_clear (&win32_signal);
  netcmd_semaphore_init ();
}

void
uninit_win32 (void)
{
  netcmd_semaphore_close ();
  if (pause_exit_enabled)
    {
      if (win32_signal.mode == WSO_MODE_UNDEF)
	{
	  struct win32_signal w;
	  win32_signal_open (&w, WSO_FORCE_CONSOLE, NULL, false);
	  win32_pause (&w);
	  win32_signal_close (&w);
	}
      else
	win32_pause (&win32_signal);
    }
  window_title_restore (&window_title);
  win32_signal_close (&win32_signal);
  WSACleanup ();
  free (win_sys_path);
}

void
set_pause_exit_win32 (void)
{
  pause_exit_enabled = true;
}

bool
init_security_attributes_allow_all (struct security_attributes *obj)
{
  CLEAR (*obj);

  obj->sa.nLength = sizeof (SECURITY_ATTRIBUTES);
  obj->sa.lpSecurityDescriptor = &obj->sd;
  obj->sa.bInheritHandle = FALSE;
  if (!InitializeSecurityDescriptor (&obj->sd, SECURITY_DESCRIPTOR_REVISION))
    return false;
  if (!SetSecurityDescriptorDacl (&obj->sd, TRUE, NULL, FALSE))
    return false;
  return true;
}

void
overlapped_io_init (struct overlapped_io *o,
		    const struct frame *frame,
		    BOOL event_state,
		    bool tuntap_buffer) /* if true: tuntap buffer, if false: socket buffer */
{
  CLEAR (*o);

  /* manual reset event, initially set according to event_state */
  o->overlapped.hEvent = CreateEvent (NULL, TRUE, event_state, NULL);
  if (o->overlapped.hEvent == NULL)
    msg (M_ERR, "Error: overlapped_io_init: CreateEvent failed");

  /* allocate buffer for overlapped I/O */
  alloc_buf_sock_tun (&o->buf_init, frame, tuntap_buffer, 0);
}

void
overlapped_io_close (struct overlapped_io *o)
{
  if (o->overlapped.hEvent)
    {
      if (!CloseHandle (o->overlapped.hEvent))
	msg (M_WARN | M_ERRNO, "Warning: CloseHandle failed on overlapped I/O event object");
    }
  free_buf (&o->buf_init);
}

char *
overlapped_io_state_ascii (const struct overlapped_io *o)
{