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 *
#	Content
1	/*
2	device-cygwin.C -- Stub for Cygwin environment
3	Copyright (C) 2003 Marc Lehmann <ocg@goof.com>
4	Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
5	2002-2003 Guus Sliepen <guus@sliepen.eu.org>
6
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	// a newer driver is available as part of the openvpn package:
29	// http://openvpn.sf.net/
30
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	#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	const char *
81	tap_device::info ()
82	{
83	return _("cygwin cipe/openvpn tap device");
84	}
85
86	tap_device::tap_device ()
87	{
88	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	{
112	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	}
148
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	}
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	info (), conf.ifname, strerror (errno));
283	free (pkt);
284	return 0;
285	}
286
287	id2mac (THISNODE->id, &((*pkt)[6]));
288
289	if (pkt->is_arp ())
290	{
291	if ((*pkt)[22] == 0x08)
292	id2mac (THISNODE->id, &((*pkt)[22]));
293	if ((*pkt)[32] == 0x08)
294	id2mac (THISNODE->id, &((*pkt)[32]));
295	}
296
297	return pkt;
298	}
299
300	void
301	tap_device::send (tap_packet * pkt)
302	{
303	(*pkt)[6] = 0x08;
304	(*pkt)[7] = 0x00;
305	(*pkt)[8] = 0x58;
306	(*pkt)[9] = 0x00;
307	(*pkt)[10] = 0x00;
308	(*pkt)[11] = 0x01;
309
310	if (pkt->is_arp ())
311	{
312	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
313	memcpy (&(pkt)[22], &(pkt)[6], sizeof (mac));
314
315	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
316	memcpy (&(pkt)[32], &(pkt)[6], sizeof (mac));
317	}
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	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	}
429	#endif