gvpe/src/device-cygwin.C

/*
    device-cygwin.C -- Stub for Cygwin environment
    Copyright (C) 2003-2005 Marc Lehmann <ocg@goof.com>
    Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
                  2002-2003 Guus Sliepen <guus@sliepen.eu.org>

    This file is part of GVPE.

    GVPE 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 gvpe; 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 <cstdio>
#include <cstring>
#include <cstdlib>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

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

#include <io.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)
#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)

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));
    };

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

  return buf;
}

static HANDLE device_handle = INVALID_HANDLE_VALUE;
static mac local_mac;
static tap_packet *rcv_pkt;
static int iopipe[2];
static HANDLE pipe_handle, send_event, thread;

static DWORD WINAPI
read_thread(void *)
{
  static OVERLAPPED overlapped;
  static DWORD dlen;
  static u32 len;
  static u8 data[MAX_MTU];

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

  for (;;)
    {
      if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped))
        {
          if (GetLastError () == ERROR_IO_PENDING)
            GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
          else
            {
              slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ()));
              exit (EXIT_FAILURE);
            }
        }

      if (dlen > 0)
        {
          len = dlen;
          WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL);
          WriteFile (pipe_handle, data, len, &dlen, NULL);
        }
    }
}

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];
  BYTE adaptername[1024];
  char tapname[1024];
  DWORD 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, _("WIN32 TAP: unable to read registry: %s"),
            wstrerror (GetLastError ()));
      exit (EXIT_FAILURE);
    }

  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, _("WIN32 TAP: no windows tap device found!"));
      exit (EXIT_FAILURE);
    }

  /* Try to open the corresponding tap device */

  if (device_handle == INVALID_HANDLE_VALUE)
    {
      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)
    {
      slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
              adaptername, tapname, wstrerror (GetLastError ()));
      exit (EXIT_FAILURE);
    }

  strcpy (ifrname, (char *)tapname);

  /* Get MAC address from tap device */

  if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
                        &local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
                        &len, 0))
    {
      slog (L_ERR,
              _("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
              adaptername, wstrerror (GetLastError ()));
      exit (EXIT_FAILURE);
    }

  pipe (iopipe);
  fd = iopipe[0];
  pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);

  send_event = CreateEvent (NULL, FALSE, FALSE, NULL);

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

  /* try to set driver media status to 'connected' */
  ULONG status = TRUE;
  DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
                   &status, sizeof (status),
                   &status, sizeof (status), &len, NULL);
  // ignore error here on purpose
}

tap_device::~tap_device ()
{
  close (iopipe[0]);
  close (iopipe[1]);
  CloseHandle (device_handle);
  CloseHandle (send_event);
}

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

  if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
    {
      slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
      delete pkt;
      return 0;
    }
    
  if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
    {
      slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
      delete pkt;
      return 0;
    }
    
  id2mac (THISNODE->id, &((*pkt)[6]));

  if (pkt->is_arp ())
    {
      if (!memcmp (&(*pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[22]));
      if (!memcmp (&(*pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[32]));
    }

  return pkt;
}

void
tap_device::send (tap_packet * pkt)
{
  memcpy (&(*pkt)[6], &local_mac, sizeof (mac));

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

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

  DWORD dlen;
  OVERLAPPED overlapped;
  overlapped.hEvent = send_event;

  if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
    {
      if (GetLastError () == ERROR_IO_PENDING)
        GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
      else
        slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
              wstrerror (GetLastError ()));
    }
}
Revision:	1.9
Committed:	Thu Mar 3 16:54:34 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_8
Changes since 1.8:	+5 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device-cygwin.C -- Stub for Cygwin environment
3	pcg	1.9	Copyright (C) 2003-2005 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	pcg	1.9	This file is part of GVPE.
8
9			GVPE is free software; you can redistribute it and/or modify
10	pcg	1.1	it under the terms of the GNU General Public License as published by
11			the Free Software Foundation; either version 2 of the License, or
12			(at your option) any later version.
13
14			This program is distributed in the hope that it will be useful,
15			but WITHOUT ANY WARRANTY; without even the implied warranty of
16			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17			GNU General Public License for more details.
18
19			You should have received a copy of the GNU General Public License
20	pcg	1.9	along with gvpe; if not, write to the Free Software
21	pcg	1.1	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22			*/
23
24			// unfortunately, there is be no way to set MAC addresses under windows,
25			// and the default cipedrvr uses a different MAC address than we do,
26			// so this module tries to fix mac addresses in packets and arp packets.
27			// this is probably not very fast, but neither is cygwin nor poll.
28			//
29			// http://cipe-win32.sourceforge.net/
30	pcg	1.3	// a newer driver is available as part of the openvpn package:
31			// http://openvpn.sf.net/
32	pcg	1.1
33			#include "config.h"
34
35	pcg	1.8	#include <cstdio>
36			#include <cstring>
37			#include <cstdlib>
38	pcg	1.1	#include <errno.h>
39			#include <sys/types.h>
40			#include <sys/stat.h>
41			#include <fcntl.h>
42			#include <unistd.h>
43
44			#include "conf.h"
45			#include "util.h"
46
47	pcg	1.6	#include <io.h>
48	pcg	1.3	#include <w32api/windows.h>
49			#include <w32api/winioctl.h>
50
51			#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
52
53			#define USERMODEDEVICEDIR "\\\\.\\"
54			#define USERDEVICEDIR "\\??\\"
55			#define TAPSUFFIX ".tap"
56
57			#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD \| 8000, request, method, FILE_ANY_ACCESS)
58
59	pcg	1.6	#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
60			#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
61			#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
62			#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)
63	pcg	1.3
64			static const char *
65			wstrerror (int err)
66			{
67			static char buf[1024];
68
69			if (!FormatMessage
70			(FORMAT_MESSAGE_FROM_SYSTEM \| FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
71			MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
72			{
73			strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
74			};
75
76	pcg	1.6	char *nl;
77			if ((nl = strchr (buf, '\r')))
78			*nl = '\0';
79	pcg	1.3
80			return buf;
81			}
82
83	pcg	1.6	static HANDLE device_handle = INVALID_HANDLE_VALUE;
84			static mac local_mac;
85			static tap_packet *rcv_pkt;
86			static int iopipe[2];
87			static HANDLE pipe_handle, send_event, thread;
88
89			static DWORD WINAPI
90			read_thread(void *)
91			{
92			static OVERLAPPED overlapped;
93			static DWORD dlen;
94			static u32 len;
95			static u8 data[MAX_MTU];
96
97			overlapped.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
98
99			for (;;)
100			{
101			if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped))
102			{
103			if (GetLastError () == ERROR_IO_PENDING)
104			GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
105			else
106			{
107			slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ()));
108	pcg	1.8	exit (EXIT_FAILURE);
109	pcg	1.6	}
110			}
111
112			if (dlen > 0)
113			{
114			len = dlen;
115			WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL);
116			WriteFile (pipe_handle, data, len, &dlen, NULL);
117			}
118			}
119			}
120
121	pcg	1.2	const char *
122			tap_device::info ()
123			{
124	pcg	1.3	return _("cygwin cipe/openvpn tap device");
125	pcg	1.2	}
126
127	pcg	1.1	tap_device::tap_device ()
128			{
129	pcg	1.3	HKEY key, key2;
130			int i;
131
132			char regpath[1024];
133			char adapterid[1024];
134	pcg	1.6	BYTE adaptername[1024];
135	pcg	1.3	char tapname[1024];
136	pcg	1.6	DWORD len;
137	pcg	1.3
138			bool found = false;
139
140			int sock, err;
141
142			/* Open registry and look for network adapters */
143
144			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
145			{
146	pcg	1.6	slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
147	pcg	1.3	wstrerror (GetLastError ()));
148	pcg	1.8	exit (EXIT_FAILURE);
149	pcg	1.3	}
150
151			for (i = 0;; i++)
152	pcg	1.1	{
153	pcg	1.3	len = sizeof (adapterid);
154			if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
155			break;
156
157			/* Find out more about this adapter */
158
159			snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
160			REG_CONTROL_NET, adapterid);
161
162			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
163			continue;
164
165			len = sizeof (adaptername);
166			err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
167
168			RegCloseKey (key2);
169
170			if (err)
171			continue;
172
173	pcg	1.4	if (conf.ifname)
174			{
175			if (strcmp (conf.ifname, adapterid))
176			continue;
177			}
178			else
179			{
180			found = true;
181			break;
182			}
183
184			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
185			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
186			OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
187	pcg	1.3	if (device_handle != INVALID_HANDLE_VALUE)
188			{
189			found = true;
190			break;
191			}
192	pcg	1.1	}
193	pcg	1.3
194			RegCloseKey (key);
195
196			if (!found)
197			{
198	pcg	1.6	slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
199	pcg	1.8	exit (EXIT_FAILURE);
200	pcg	1.3	}
201
202			/* Try to open the corresponding tap device */
203
204			if (device_handle == INVALID_HANDLE_VALUE)
205			{
206	pcg	1.6	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
207	pcg	1.3	device_handle =
208			CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
209			OPEN_EXISTING,
210			FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
211			}
212
213			if (device_handle == INVALID_HANDLE_VALUE)
214			{
215	pcg	1.6	slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
216			adaptername, tapname, wstrerror (GetLastError ()));
217	pcg	1.8	exit (EXIT_FAILURE);
218	pcg	1.3	}
219
220	pcg	1.6	strcpy (ifrname, (char *)tapname);
221	pcg	1.4
222	pcg	1.3	/* Get MAC address from tap device */
223
224	pcg	1.6	if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
225			&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
226			&len, 0))
227	pcg	1.3	{
228			slog (L_ERR,
229	pcg	1.6	_("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
230	pcg	1.5	adaptername, wstrerror (GetLastError ()));
231	pcg	1.8	exit (EXIT_FAILURE);
232	pcg	1.3	}
233	pcg	1.6
234			pipe (iopipe);
235			fd = iopipe[0];
236			pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);
237
238			send_event = CreateEvent (NULL, FALSE, FALSE, NULL);
239
240			thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL);
241
242			/* try to set driver media status to 'connected' */
243			ULONG status = TRUE;
244			DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
245			&status, sizeof (status),
246			&status, sizeof (status), &len, NULL);
247			// ignore error here on purpose
248	pcg	1.1	}
249
250			tap_device::~tap_device ()
251			{
252	pcg	1.6	close (iopipe[0]);
253			close (iopipe[1]);
254			CloseHandle (device_handle);
255			CloseHandle (send_event);
256	pcg	1.1	}
257
258			tap_packet *
259			tap_device::recv ()
260			{
261			tap_packet *pkt = new tap_packet;
262
263	pcg	1.6	if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
264			{
265			slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
266			delete pkt;
267			return 0;
268			}
269
270			if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
271	pcg	1.1	{
272	pcg	1.6	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
273			delete pkt;
274	pcg	1.1	return 0;
275			}
276	pcg	1.6
277	pcg	1.1	id2mac (THISNODE->id, &((*pkt)[6]));
278
279			if (pkt->is_arp ())
280			{
281	pcg	1.6	if (!memcmp (&(pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[22]));
282			if (!memcmp (&(pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[32]));
283	pcg	1.1	}
284
285			return pkt;
286			}
287
288			void
289	pcg	1.3	tap_device::send (tap_packet * pkt)
290	pcg	1.1	{
291	pcg	1.6	memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
292	pcg	1.1
293			if (pkt->is_arp ())
294			{
295	pcg	1.3	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
296	pcg	1.6	memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
297	pcg	1.1
298	pcg	1.3	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
299	pcg	1.6	memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
300	pcg	1.1	}
301
302	pcg	1.6	DWORD dlen;
303			OVERLAPPED overlapped;
304			overlapped.hEvent = send_event;
305	pcg	1.3
306	pcg	1.6	if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
307	pcg	1.3	{
308			if (GetLastError () == ERROR_IO_PENDING)
309	pcg	1.6	GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
310	pcg	1.3	else
311	pcg	1.6	slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
312			wstrerror (GetLastError ()));
313	pcg	1.3	}
314	pcg	1.1	}