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 (%s) is not a usable Windows tap device: %s"),
              device, iface, 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): %s"),
              device, iface, 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:	1.4
Committed:	Wed Oct 15 01:35:45 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+24 -95 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	static mac my_mac;
62
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	const char *
82	tap_device::info ()
83	{
84	return _("cygwin cipe/openvpn tap device");
85	}
86
87	tap_device::tap_device ()
88	{
89	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	{
113	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	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	if (device_handle != INVALID_HANDLE_VALUE)
148	{
149	found = true;
150	break;
151	}
152	}
153
154	RegCloseKey (key);
155
156	if (!found)
157	{
158	slog (L_ERR, _("No Windows tap device found!"));
159	exit (1);
160	}
161
162	strcpy (ifrname, adaptername);
163
164	/* Try to open the corresponding tap device */
165
166	if (device_handle == INVALID_HANDLE_VALUE)
167	{
168	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, 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	exit (1);
180	}
181
182	fd = cygwin_attach_handle_to_fd (tapname, -1, device_handle, 1, GENERIC_WRITE \| GENERIC_READ);
183
184	/* Get MAC address from tap device */
185
186	if (!DeviceIoControl
187	(device_handle, TAP_IOCTL_GET_MAC, &mac, sizeof (mac), &mac, sizeof (mac), &len, 0))
188	{
189	slog (L_ERR,
190	_("Could not get MAC address from Windows tap device %s (%s): %s"),
191	device, iface, wstrerror (GetLastError ()));
192	exit (1);
193	}
194	}
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	info (), conf.ifname, strerror (errno));
212	free (pkt);
213	return 0;
214	}
215
216	id2mac (THISNODE->id, &((*pkt)[6]));
217
218	if (pkt->is_arp ())
219	{
220	if ((*pkt)[22] == 0x08)
221	id2mac (THISNODE->id, &((*pkt)[22]));
222	if ((*pkt)[32] == 0x08)
223	id2mac (THISNODE->id, &((*pkt)[32]));
224	}
225
226	return pkt;
227	}
228
229	void
230	tap_device::send (tap_packet * pkt)
231	{
232	(*pkt)[6] = 0x08;
233	(*pkt)[7] = 0x00;
234	(*pkt)[8] = 0x58;
235	(*pkt)[9] = 0x00;
236	(*pkt)[10] = 0x00;
237	(*pkt)[11] = 0x01;
238
239	if (pkt->is_arp ())
240	{
241	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
242	memcpy (&(pkt)[22], &(pkt)[6], sizeof (mac));
243
244	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
245	memcpy (&(pkt)[32], &(pkt)[6], sizeof (mac));
246	}
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	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	}
358	#endif