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 mac my_mac;

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 (conf.ifname)
        {
          if (strcmp (conf.ifname, adapterid))
            continue;
        }
      else
        {
          found = true;
          break;
        }

      snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
      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)
        {
          found = true;
          break;
        }
    }

  RegCloseKey (key);

  if (!found)
    {
      slog (L_ERR, _("No Windows tap device found!"));
      exit (1);
    }

  strcpy (ifrname, 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 is not a usable Windows tap device: %s"),
              adaptername, wstrerror (GetLastError ()));
      exit (1);
    }

  fd = cygwin_attach_handle_to_fd (tapname, -1, device_handle, 1, GENERIC_WRITE | GENERIC_READ);

  /* Get MAC address from tap device */

  if (!DeviceIoControl
      (device_handle, TAP_IOCTL_GET_MAC, &mac, sizeof (mac), &mac, sizeof (mac), &len, 0))
    {
      slog (L_ERR,
              _("Could not get MAC address from Windows tap device %s: %s"),
              adaptername, wstrerror (GetLastError ()));
      exit (1);
    }
}

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:	1.5
Committed:	Wed Oct 15 01:38:24 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+4 -4 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	pcg	1.4	static mac my_mac;
62	pcg	1.3
63			static const char *
64			wstrerror (int err)
65			{
66			static char buf[1024];
67
68			if (!FormatMessage
69			(FORMAT_MESSAGE_FROM_SYSTEM \| FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
70			MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
71			{
72			strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
73			};
74
75			if ((char *newline = strchr (buf, '\r')))
76			*newline = '\0';
77
78			return buf;
79			}
80
81	pcg	1.2	const char *
82			tap_device::info ()
83			{
84	pcg	1.3	return _("cygwin cipe/openvpn tap device");
85	pcg	1.2	}
86
87	pcg	1.1	tap_device::tap_device ()
88			{
89	pcg	1.3	HKEY key, key2;
90			int i;
91
92			char regpath[1024];
93			char adapterid[1024];
94			char adaptername[1024];
95			char tapname[1024];
96			long len;
97
98			bool found = false;
99
100			int sock, err;
101
102			/* Open registry and look for network adapters */
103
104			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
105			{
106			slog (L_ERR, _("Unable to read registry: %s"),
107			wstrerror (GetLastError ()));
108			return false;
109			}
110
111			for (i = 0;; i++)
112	pcg	1.1	{
113	pcg	1.3	len = sizeof (adapterid);
114			if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
115			break;
116
117			/* Find out more about this adapter */
118
119			snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
120			REG_CONTROL_NET, adapterid);
121
122			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
123			continue;
124
125			len = sizeof (adaptername);
126			err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
127
128			RegCloseKey (key2);
129
130			if (err)
131			continue;
132
133	pcg	1.4	if (conf.ifname)
134			{
135			if (strcmp (conf.ifname, adapterid))
136			continue;
137			}
138			else
139			{
140			found = true;
141			break;
142			}
143
144			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
145			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
146			OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
147	pcg	1.3	if (device_handle != INVALID_HANDLE_VALUE)
148			{
149			found = true;
150			break;
151			}
152	pcg	1.1	}
153	pcg	1.3
154			RegCloseKey (key);
155
156			if (!found)
157			{
158			slog (L_ERR, _("No Windows tap device found!"));
159	pcg	1.4	exit (1);
160	pcg	1.3	}
161
162	pcg	1.4	strcpy (ifrname, adaptername);
163	pcg	1.3
164			/* Try to open the corresponding tap device */
165
166			if (device_handle == INVALID_HANDLE_VALUE)
167			{
168	pcg	1.4	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
169	pcg	1.3	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	pcg	1.5	slog (L_ERR, _("%s is not a usable Windows tap device: %s"),
178			adaptername, wstrerror (GetLastError ()));
179	pcg	1.4	exit (1);
180	pcg	1.3	}
181
182	pcg	1.4	fd = cygwin_attach_handle_to_fd (tapname, -1, device_handle, 1, GENERIC_WRITE \| GENERIC_READ);
183
184	pcg	1.3	/* Get MAC address from tap device */
185
186			if (!DeviceIoControl
187	pcg	1.4	(device_handle, TAP_IOCTL_GET_MAC, &mac, sizeof (mac), &mac, sizeof (mac), &len, 0))
188	pcg	1.3	{
189			slog (L_ERR,
190	pcg	1.5	_("Could not get MAC address from Windows tap device %s: %s"),
191			adaptername, wstrerror (GetLastError ()));
192	pcg	1.4	exit (1);
193	pcg	1.3	}
194	pcg	1.1	}
195
196			tap_device::~tap_device ()
197			{
198			close (fd);
199			}
200
201			tap_packet *
202			tap_device::recv ()
203			{
204			tap_packet *pkt = new tap_packet;
205
206			pkt->len = read (fd, &((*pkt)[0]), MAX_MTU);
207
208			if (pkt->len <= 0)
209			{
210			slog (L_ERR, _("error while reading from %s %s: %s"),
211	pcg	1.3	info (), conf.ifname, strerror (errno));
212	pcg	1.1	free (pkt);
213			return 0;
214			}
215
216			id2mac (THISNODE->id, &((*pkt)[6]));
217
218			if (pkt->is_arp ())
219			{
220	pcg	1.3	if ((*pkt)[22] == 0x08)
221			id2mac (THISNODE->id, &((*pkt)[22]));
222			if ((*pkt)[32] == 0x08)
223			id2mac (THISNODE->id, &((*pkt)[32]));
224	pcg	1.1	}
225
226			return pkt;
227			}
228
229			void
230	pcg	1.3	tap_device::send (tap_packet * pkt)
231	pcg	1.1	{
232	pcg	1.3	(*pkt)[6] = 0x08;
233			(*pkt)[7] = 0x00;
234			(*pkt)[8] = 0x58;
235			(*pkt)[9] = 0x00;
236			(*pkt)[10] = 0x00;
237			(*pkt)[11] = 0x01;
238	pcg	1.1
239			if (pkt->is_arp ())
240			{
241	pcg	1.3	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
242			memcpy (&(pkt)[22], &(pkt)[6], sizeof (mac));
243	pcg	1.1
244	pcg	1.3	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
245			memcpy (&(pkt)[32], &(pkt)[6], sizeof (mac));
246	pcg	1.1	}
247
248			if (write (fd, &((*pkt)[0]), pkt->len) < 0)
249			slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname,
250	pcg	1.3	strerror (errno));
251			}
252
253			#if 0
254
255			slog (L_DEBUG, _indent: Standard input:377: Error:Stmt nesting error.
256			("Tap reader running"));
257
258			/* Read from tap device and send to parent */
259
260			overlapped.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
261
262			for indent
263			: Standard input: 320: Error:Stmt nesting error.(;;
264			)
265			{
266			overlapped.Offset = 0;
267			overlapped.OffsetHigh = 0;
268			ResetEvent (overlapped.hEvent);
269
270			status = ReadFile (device_handle, buf, sizeof (buf), &len, &overlapped);
271
272			if (!status)
273			{
274			if (GetLastError () == ERROR_IO_PENDING)
275			{
276			WaitForSingleObject (overlapped.hEvent, INFINITE);
277			if (!GetOverlappedResult (device_handle, &overlapped, &len, FALSE))
278			continue;
279			}
280			else
281			{
282			slog (L_ERR, _("Error while reading from %s %s: %s"),
283			device_info, device, strerror (errno));
284			return -1;
285			}
286			}
287
288			if (send (sock, buf, len, 0) <= 0)
289			return -1;
290			}
291			}
292
293			void
294			close_device (void)
295			{
296			cp ();
297
298			CloseHandle (device_handle);
299			}
300
301			bool
302			read_packet (vpn_packet_t * packet)
303			{
304			int lenin;
305
306			cp ();
307
308			if ((lenin = recv (device_fd, packet->data, MTU, 0)) <= 0)
309			{
310			slog (L_ERR, _("Error while reading from %s %s: %s"), device_info,
311			device, strerror (errno));
312			return false;
313			}
314
315			packet->len = lenin;
316
317			device_total_in += packet->len;
318
319			ifdebug (TRAFFIC) slog (L_DEBUG, _("Read packet of %d bytes from %s"),
320			packet->len, device_info);
321
322			return true;
323			}
324
325			bool
326			write_packet (vpn_packet_t * packet)
327			{
328			long lenout;
329			OVERLAPPED overlapped = { 0 };
330
331			cp ();
332
333			ifdebug (TRAFFIC) slog (L_DEBUG, _("Writing packet of %d bytes to %s"),
334			packet->len, device_info);
335
336			if (!WriteFile
337			(device_handle, packet->data, packet->len, &lenout, &overlapped))
338			{
339			slog (L_ERR, _("Error while writing to %s %s: %s"), device_info,
340			device, wstrerror (GetLastError ()));
341			return false;
342			}
343
344			device_total_out += packet->len;
345
346			return true;
347			}
348
349			void
350			dump_device_stats (void)
351			{
352			cp ();
353
354			slog (L_DEBUG, _("Statistics for %s %s:"), device_info, device);
355			slog (L_DEBUG, _(" total bytes in: %10d"), device_total_in);
356			slog (L_DEBUG, _(" total bytes out: %10d"), device_total_out);
357	pcg	1.1	}
358	pcg	1.3	#endif