gvpe/src/device-cygwin.C

/*
    device-cygwin.C -- Stub for Cygwin environment
    Copyright (C) 2003 Marc Lehmann <ocg@goof.com>
    Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
                  2002-2003 Guus Sliepen <guus@sliepen.eu.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

// unfortunately, there is be no way to set MAC addresses under windows,
// and the default cipedrvr uses a different MAC address than we do,
// so this module tries to fix mac addresses in packets and arp packets.
// this is probably not very fast, but neither is cygwin nor poll.
//
// http://cipe-win32.sourceforge.net/
// a newer driver is available as part of the openvpn package:
// http://openvpn.sf.net/

#include "config.h"

#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <cstring>

#include "conf.h"
#include "util.h"

#include <w32api/windows.h>
#include <w32api/winioctl.h>

#define REG_CONTROL_NET      "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"

#define USERMODEDEVICEDIR "\\\\.\\"
#define USERDEVICEDIR "\\??\\"
#define TAPSUFFIX     ".tap"

#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)

#define TAP_IOCTL_GET_LASTMAC    TAP_CONTROL_CODE(0, METHOD_BUFFERED)
#define TAP_IOCTL_GET_MAC        TAP_CONTROL_CODE(1, METHOD_BUFFERED)
#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)

static HANDLE device_handle = INVALID_HANDLE_VALUE;

static const char *
wstrerror (int err)
{
  static char buf[1024];

  if (!FormatMessage
      (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
       MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
    {
      strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
    };

  if ((char *newline = strchr (buf, '\r')))
    *newline = '\0';

  return buf;
}

const char *
tap_device::info ()
{
  return _("cygwin cipe/openvpn tap device");
}

tap_device::tap_device ()
{
  HKEY key, key2;
  int i;

  char regpath[1024];
  char adapterid[1024];
  char adaptername[1024];
  char tapname[1024];
  long len;

  bool found = false;

  int sock, err;

  /* Open registry and look for network adapters */

  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
    {
      slog (L_ERR, _("Unable to read registry: %s"),
            wstrerror (GetLastError ()));
      return false;
    }

  for (i = 0;; i++)
    {
      len = sizeof (adapterid);
      if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
        break;

      /* Find out more about this adapter */

      snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
                REG_CONTROL_NET, adapterid);

      if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
        continue;

      len = sizeof (adaptername);
      err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);

      RegCloseKey (key2);

      if (err)
        continue;

      if (strcmp (conf.ifname, adapterid))
        continue;

      found = true;
      break;

      snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX,
                adapterid);
      device_handle = CreateFile (tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, indent: Standard input: 237: Error:Stmt nesting error.FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED,
                                  0);
      if (device_handle != INVALID_HANDLE_VALUE)
        {
          found = true;
          break;
        }
    }

  RegCloseKey (key);

  if (!found)
    {
      slog (L_ERR, _("No Windows tap device found!"));
      return false;
    }

  if (!device)
    device = xstrdup (adapterid);

  if (!iface)
    iface = xstrdup (adaptername);

  /* Try to open the corresponding tap device */

  if (device_handle == INVALID_HANDLE_VALUE)
    {
      snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX,
                device);
      device_handle =
        CreateFile (tapname, GENERIC_WRITE | GENERIC_READ, 0, 0,
                    OPEN_EXISTING,
                    FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
    }

  if (device_handle == INVALID_HANDLE_VALUE)
    {
      slog (L_ERR, _("%s (%s) is not a usable Windows tap device: %s"),
              device, iface, wstrerror (GetLastError ()));
      return false;
    }

  /* Get MAC address from tap device */

  if (!DeviceIoControl
      (device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof (mymac.x), mymac.x,
       sizeof (mymac.x), &len, 0))
    {
      slog (L_ERR,
              _
              ("Could not get MAC address from Windows tap device %s (%s): %s"),
              device, iface, wstrerror (GetLastError ()));
      return false;
    }

  if (routing_mode == RMODE_ROUTER)
    {
      overwrite_mac = 1;
    }

  /* Create a listening socket */

  err = getaddrinfo (NULL, myport, &hint, &ai);

  if (err || !ai)
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
              gai_strerror (errno));
      return false;
    }

  sock = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol);

  if (sock < 0)
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "socket",
              strerror (errno));
      return false;
    }

  if (bind (sock, ai->ai_addr, ai->ai_addrlen))
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "bind",
              strerror (errno));
      return false;
    }

  freeaddrinfo (ai);

  if (listen (sock, 1))
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "listen",
              strerror (errno));
      return false;
    }

  /* Start the tap reader */

  thread = CreateThread (NULL, 0, tapreader, NULL, 0, NULL);

  if (!thread)
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "CreateThread",
              wstrerror (GetLastError ()));
      return false;
    }

  /* Wait for the tap reader to connect back to us */

  if ((device_fd = accept (sock, NULL, 0)) == -1)
    {
      slog (L_ERR, _("System call `%s' failed: %s"), "accept",
              strerror (errno));
      return false;
    }

  closesocket (sock);

  device_info = _("Windows tap device");

  slog (L_INFO, _("%s (%s) is a %s"), device, iface, device_info);

  return true;
}

}

tap_device::~tap_device ()
{
  close (fd);
}

tap_packet *
tap_device::recv ()
{
  tap_packet *pkt = new tap_packet;

  pkt->len = read (fd, &((*pkt)[0]), MAX_MTU);

  if (pkt->len <= 0)
    {
      slog (L_ERR, _("error while reading from %s %s: %s"),
            info (), conf.ifname, strerror (errno));
      free (pkt);
      return 0;
    }

  id2mac (THISNODE->id, &((*pkt)[6]));

  if (pkt->is_arp ())
    {
      if ((*pkt)[22] == 0x08)
        id2mac (THISNODE->id, &((*pkt)[22]));
      if ((*pkt)[32] == 0x08)
        id2mac (THISNODE->id, &((*pkt)[32]));
    }

  return pkt;
}

void
tap_device::send (tap_packet * pkt)
{
  (*pkt)[6] = 0x08;
  (*pkt)[7] = 0x00;
  (*pkt)[8] = 0x58;
  (*pkt)[9] = 0x00;
  (*pkt)[10] = 0x00;
  (*pkt)[11] = 0x01;

  if (pkt->is_arp ())
    {
      if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id)
        memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac));

      if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id)
        memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac));
    }

  if (write (fd, &((*pkt)[0]), pkt->len) < 0)
    slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname,
          strerror (errno));
}

#if 0

slog (L_DEBUG, _indent: Standard input:377: Error:Stmt nesting error.
("Tap reader running"));

        /* Read from tap device and send to parent */

overlapped.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);

for indent
: Standard input: 320: Error:Stmt nesting error.(;;
  )
{
  overlapped.Offset = 0;
  overlapped.OffsetHigh = 0;
  ResetEvent (overlapped.hEvent);

  status = ReadFile (device_handle, buf, sizeof (buf), &len, &overlapped);

  if (!status)
    {
      if (GetLastError () == ERROR_IO_PENDING)
        {
          WaitForSingleObject (overlapped.hEvent, INFINITE);
          if (!GetOverlappedResult (device_handle, &overlapped, &len, FALSE))
            continue;
        }
      else
        {
          slog (L_ERR, _("Error while reading from %s %s: %s"),
                  device_info, device, strerror (errno));
          return -1;
        }
    }

  if (send (sock, buf, len, 0) <= 0)
    return -1;
}
}

void
close_device (void)
{
  cp ();

  CloseHandle (device_handle);
}

bool
read_packet (vpn_packet_t * packet)
{
  int lenin;

  cp ();

  if ((lenin = recv (device_fd, packet->data, MTU, 0)) <= 0)
    {
      slog (L_ERR, _("Error while reading from %s %s: %s"), device_info,
              device, strerror (errno));
      return false;
    }

  packet->len = lenin;

  device_total_in += packet->len;

  ifdebug (TRAFFIC) slog (L_DEBUG, _("Read packet of %d bytes from %s"),
                            packet->len, device_info);

  return true;
}

bool
write_packet (vpn_packet_t * packet)
{
  long lenout;
  OVERLAPPED overlapped = { 0 };

  cp ();

  ifdebug (TRAFFIC) slog (L_DEBUG, _("Writing packet of %d bytes to %s"),
                            packet->len, device_info);

  if (!WriteFile
      (device_handle, packet->data, packet->len, &lenout, &overlapped))
    {
      slog (L_ERR, _("Error while writing to %s %s: %s"), device_info,
              device, wstrerror (GetLastError ()));
      return false;
    }

  device_total_out += packet->len;

  return true;
}

void
dump_device_stats (void)
{
  cp ();

  slog (L_DEBUG, _("Statistics for %s %s:"), device_info, device);
  slog (L_DEBUG, _(" total bytes in:  %10d"), device_total_in);
  slog (L_DEBUG, _(" total bytes out: %10d"), device_total_out);
}
#endif
Revision:	1.3
Committed:	Wed Oct 15 00:25:15 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+339 -15 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device-cygwin.C -- Stub for Cygwin environment
3			Copyright (C) 2003 Marc Lehmann <ocg@goof.com>
4	pcg	1.3	Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
5			2002-2003 Guus Sliepen <guus@sliepen.eu.org>
6	pcg	1.1
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21
22			// unfortunately, there is be no way to set MAC addresses under windows,
23			// and the default cipedrvr uses a different MAC address than we do,
24			// so this module tries to fix mac addresses in packets and arp packets.
25			// this is probably not very fast, but neither is cygwin nor poll.
26			//
27			// http://cipe-win32.sourceforge.net/
28	pcg	1.3	// a newer driver is available as part of the openvpn package:
29			// http://openvpn.sf.net/
30	pcg	1.1
31			#include "config.h"
32
33			#include <stdio.h>
34			#include <errno.h>
35			#include <sys/types.h>
36			#include <sys/stat.h>
37			#include <fcntl.h>
38			#include <unistd.h>
39			#include <syslog.h>
40			#include <cstring>
41
42			#include "conf.h"
43			#include "util.h"
44
45	pcg	1.3	#include <w32api/windows.h>
46			#include <w32api/winioctl.h>
47
48			#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
49
50			#define USERMODEDEVICEDIR "\\\\.\\"
51			#define USERDEVICEDIR "\\??\\"
52			#define TAPSUFFIX ".tap"
53
54			#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD \| 8000, request, method, FILE_ANY_ACCESS)
55
56			#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
57			#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
58			#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
59
60			static HANDLE device_handle = INVALID_HANDLE_VALUE;
61
62			static const char *
63			wstrerror (int err)
64			{
65			static char buf[1024];
66
67			if (!FormatMessage
68			(FORMAT_MESSAGE_FROM_SYSTEM \| FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
69			MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
70			{
71			strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
72			};
73
74			if ((char *newline = strchr (buf, '\r')))
75			*newline = '\0';
76
77			return buf;
78			}
79
80	pcg	1.2	const char *
81			tap_device::info ()
82			{
83	pcg	1.3	return _("cygwin cipe/openvpn tap device");
84	pcg	1.2	}
85
86	pcg	1.1	tap_device::tap_device ()
87			{
88	pcg	1.3	HKEY key, key2;
89			int i;
90
91			char regpath[1024];
92			char adapterid[1024];
93			char adaptername[1024];
94			char tapname[1024];
95			long len;
96
97			bool found = false;
98
99			int sock, err;
100
101			/* Open registry and look for network adapters */
102
103			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
104			{
105			slog (L_ERR, _("Unable to read registry: %s"),
106			wstrerror (GetLastError ()));
107			return false;
108			}
109
110			for (i = 0;; i++)
111	pcg	1.1	{
112	pcg	1.3	len = sizeof (adapterid);
113			if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
114			break;
115
116			/* Find out more about this adapter */
117
118			snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
119			REG_CONTROL_NET, adapterid);
120
121			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
122			continue;
123
124			len = sizeof (adaptername);
125			err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
126
127			RegCloseKey (key2);
128
129			if (err)
130			continue;
131
132			if (strcmp (conf.ifname, adapterid))
133			continue;
134
135			found = true;
136			break;
137
138			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX,
139			adapterid);
140			device_handle = CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0, OPEN_EXISTING, indent: Standard input: 237: Error:Stmt nesting error.FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED,
141			0);
142			if (device_handle != INVALID_HANDLE_VALUE)
143			{
144			found = true;
145			break;
146			}
147	pcg	1.1	}
148	pcg	1.3
149			RegCloseKey (key);
150
151			if (!found)
152			{
153			slog (L_ERR, _("No Windows tap device found!"));
154			return false;
155			}
156
157			if (!device)
158			device = xstrdup (adapterid);
159
160			if (!iface)
161			iface = xstrdup (adaptername);
162
163			/* Try to open the corresponding tap device */
164
165			if (device_handle == INVALID_HANDLE_VALUE)
166			{
167			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX,
168			device);
169			device_handle =
170			CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
171			OPEN_EXISTING,
172			FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
173			}
174
175			if (device_handle == INVALID_HANDLE_VALUE)
176			{
177			slog (L_ERR, _("%s (%s) is not a usable Windows tap device: %s"),
178			device, iface, wstrerror (GetLastError ()));
179			return false;
180			}
181
182			/* Get MAC address from tap device */
183
184			if (!DeviceIoControl
185			(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof (mymac.x), mymac.x,
186			sizeof (mymac.x), &len, 0))
187			{
188			slog (L_ERR,
189			_
190			("Could not get MAC address from Windows tap device %s (%s): %s"),
191			device, iface, wstrerror (GetLastError ()));
192			return false;
193			}
194
195			if (routing_mode == RMODE_ROUTER)
196			{
197			overwrite_mac = 1;
198			}
199
200			/* Create a listening socket */
201
202			err = getaddrinfo (NULL, myport, &hint, &ai);
203
204			if (err \|\| !ai)
205			{
206			slog (L_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
207			gai_strerror (errno));
208			return false;
209			}
210
211			sock = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol);
212
213			if (sock < 0)
214			{
215			slog (L_ERR, _("System call `%s' failed: %s"), "socket",
216			strerror (errno));
217			return false;
218			}
219
220			if (bind (sock, ai->ai_addr, ai->ai_addrlen))
221			{
222			slog (L_ERR, _("System call `%s' failed: %s"), "bind",
223			strerror (errno));
224			return false;
225			}
226
227			freeaddrinfo (ai);
228
229			if (listen (sock, 1))
230			{
231			slog (L_ERR, _("System call `%s' failed: %s"), "listen",
232			strerror (errno));
233			return false;
234			}
235
236			/* Start the tap reader */
237
238			thread = CreateThread (NULL, 0, tapreader, NULL, 0, NULL);
239
240			if (!thread)
241			{
242			slog (L_ERR, _("System call `%s' failed: %s"), "CreateThread",
243			wstrerror (GetLastError ()));
244			return false;
245			}
246
247			/* Wait for the tap reader to connect back to us */
248
249			if ((device_fd = accept (sock, NULL, 0)) == -1)
250			{
251			slog (L_ERR, _("System call `%s' failed: %s"), "accept",
252			strerror (errno));
253			return false;
254			}
255
256			closesocket (sock);
257
258			device_info = _("Windows tap device");
259
260			slog (L_INFO, _("%s (%s) is a %s"), device, iface, device_info);
261
262			return true;
263			}
264
265	pcg	1.1	}
266
267			tap_device::~tap_device ()
268			{
269			close (fd);
270			}
271
272			tap_packet *
273			tap_device::recv ()
274			{
275			tap_packet *pkt = new tap_packet;
276
277			pkt->len = read (fd, &((*pkt)[0]), MAX_MTU);
278
279			if (pkt->len <= 0)
280			{
281			slog (L_ERR, _("error while reading from %s %s: %s"),
282	pcg	1.3	info (), conf.ifname, strerror (errno));
283	pcg	1.1	free (pkt);
284			return 0;
285			}
286
287			id2mac (THISNODE->id, &((*pkt)[6]));
288
289			if (pkt->is_arp ())
290			{
291	pcg	1.3	if ((*pkt)[22] == 0x08)
292			id2mac (THISNODE->id, &((*pkt)[22]));
293			if ((*pkt)[32] == 0x08)
294			id2mac (THISNODE->id, &((*pkt)[32]));
295	pcg	1.1	}
296
297			return pkt;
298			}
299
300			void
301	pcg	1.3	tap_device::send (tap_packet * pkt)
302	pcg	1.1	{
303	pcg	1.3	(*pkt)[6] = 0x08;
304			(*pkt)[7] = 0x00;
305			(*pkt)[8] = 0x58;
306			(*pkt)[9] = 0x00;
307			(*pkt)[10] = 0x00;
308			(*pkt)[11] = 0x01;
309	pcg	1.1
310			if (pkt->is_arp ())
311			{
312	pcg	1.3	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
313			memcpy (&(pkt)[22], &(pkt)[6], sizeof (mac));
314	pcg	1.1
315	pcg	1.3	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
316			memcpy (&(pkt)[32], &(pkt)[6], sizeof (mac));
317	pcg	1.1	}
318
319			if (write (fd, &((*pkt)[0]), pkt->len) < 0)
320			slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname,
321	pcg	1.3	strerror (errno));
322			}
323
324			#if 0
325
326			slog (L_DEBUG, _indent: Standard input:377: Error:Stmt nesting error.
327			("Tap reader running"));
328
329			/* Read from tap device and send to parent */
330
331			overlapped.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
332
333			for indent
334			: Standard input: 320: Error:Stmt nesting error.(;;
335			)
336			{
337			overlapped.Offset = 0;
338			overlapped.OffsetHigh = 0;
339			ResetEvent (overlapped.hEvent);
340
341			status = ReadFile (device_handle, buf, sizeof (buf), &len, &overlapped);
342
343			if (!status)
344			{
345			if (GetLastError () == ERROR_IO_PENDING)
346			{
347			WaitForSingleObject (overlapped.hEvent, INFINITE);
348			if (!GetOverlappedResult (device_handle, &overlapped, &len, FALSE))
349			continue;
350			}
351			else
352			{
353			slog (L_ERR, _("Error while reading from %s %s: %s"),
354			device_info, device, strerror (errno));
355			return -1;
356			}
357			}
358
359			if (send (sock, buf, len, 0) <= 0)
360			return -1;
361			}
362			}
363
364			void
365			close_device (void)
366			{
367			cp ();
368
369			CloseHandle (device_handle);
370			}
371
372			bool
373			read_packet (vpn_packet_t * packet)
374			{
375			int lenin;
376
377			cp ();
378
379			if ((lenin = recv (device_fd, packet->data, MTU, 0)) <= 0)
380			{
381			slog (L_ERR, _("Error while reading from %s %s: %s"), device_info,
382			device, strerror (errno));
383			return false;
384			}
385
386			packet->len = lenin;
387
388			device_total_in += packet->len;
389
390			ifdebug (TRAFFIC) slog (L_DEBUG, _("Read packet of %d bytes from %s"),
391			packet->len, device_info);
392
393			return true;
394			}
395
396			bool
397			write_packet (vpn_packet_t * packet)
398			{
399			long lenout;
400			OVERLAPPED overlapped = { 0 };
401
402			cp ();
403
404			ifdebug (TRAFFIC) slog (L_DEBUG, _("Writing packet of %d bytes to %s"),
405			packet->len, device_info);
406
407			if (!WriteFile
408			(device_handle, packet->data, packet->len, &lenout, &overlapped))
409			{
410			slog (L_ERR, _("Error while writing to %s %s: %s"), device_info,
411			device, wstrerror (GetLastError ()));
412			return false;
413			}
414
415			device_total_out += packet->len;
416
417			return true;
418			}
419
420			void
421			dump_device_stats (void)
422			{
423			cp ();
424
425			slog (L_DEBUG, _("Statistics for %s %s:"), device_info, device);
426			slog (L_DEBUG, _(" total bytes in: %10d"), device_total_in);
427			slog (L_DEBUG, _(" total bytes out: %10d"), device_total_out);
428	pcg	1.1	}
429	pcg	1.3	#endif