gvpe/src/device-cygwin.C

/*
    device-cygwin.C -- Stub for Cygwin environment
    Copyright (C) 2003-2004 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 <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:	1.8
Committed:	Thu Jan 29 18:55:10 2004 UTC (20 years, 3 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	VPE_1_6, rel-1_7, VPE-1_6_1
Changes since 1.7:	+8 -7 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device-cygwin.C -- Stub for Cygwin environment
3	pcg	1.7	Copyright (C) 2003-2004 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	pcg	1.8	#include <cstdio>
34			#include <cstring>
35			#include <cstdlib>
36	pcg	1.1	#include <errno.h>
37			#include <sys/types.h>
38			#include <sys/stat.h>
39			#include <fcntl.h>
40			#include <unistd.h>
41
42			#include "conf.h"
43			#include "util.h"
44
45	pcg	1.6	#include <io.h>
46	pcg	1.3	#include <w32api/windows.h>
47			#include <w32api/winioctl.h>
48
49			#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
50
51			#define USERMODEDEVICEDIR "\\\\.\\"
52			#define USERDEVICEDIR "\\??\\"
53			#define TAPSUFFIX ".tap"
54
55			#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD \| 8000, request, method, FILE_ANY_ACCESS)
56
57	pcg	1.6	#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
58			#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
59			#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
60			#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)
61	pcg	1.3
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	pcg	1.6	char *nl;
75			if ((nl = strchr (buf, '\r')))
76			*nl = '\0';
77	pcg	1.3
78			return buf;
79			}
80
81	pcg	1.6	static HANDLE device_handle = INVALID_HANDLE_VALUE;
82			static mac local_mac;
83			static tap_packet *rcv_pkt;
84			static int iopipe[2];
85			static HANDLE pipe_handle, send_event, thread;
86
87			static DWORD WINAPI
88			read_thread(void *)
89			{
90			static OVERLAPPED overlapped;
91			static DWORD dlen;
92			static u32 len;
93			static u8 data[MAX_MTU];
94
95			overlapped.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
96
97			for (;;)
98			{
99			if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped))
100			{
101			if (GetLastError () == ERROR_IO_PENDING)
102			GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
103			else
104			{
105			slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ()));
106	pcg	1.8	exit (EXIT_FAILURE);
107	pcg	1.6	}
108			}
109
110			if (dlen > 0)
111			{
112			len = dlen;
113			WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL);
114			WriteFile (pipe_handle, data, len, &dlen, NULL);
115			}
116			}
117			}
118
119	pcg	1.2	const char *
120			tap_device::info ()
121			{
122	pcg	1.3	return _("cygwin cipe/openvpn tap device");
123	pcg	1.2	}
124
125	pcg	1.1	tap_device::tap_device ()
126			{
127	pcg	1.3	HKEY key, key2;
128			int i;
129
130			char regpath[1024];
131			char adapterid[1024];
132	pcg	1.6	BYTE adaptername[1024];
133	pcg	1.3	char tapname[1024];
134	pcg	1.6	DWORD len;
135	pcg	1.3
136			bool found = false;
137
138			int sock, err;
139
140			/* Open registry and look for network adapters */
141
142			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
143			{
144	pcg	1.6	slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
145	pcg	1.3	wstrerror (GetLastError ()));
146	pcg	1.8	exit (EXIT_FAILURE);
147	pcg	1.3	}
148
149			for (i = 0;; i++)
150	pcg	1.1	{
151	pcg	1.3	len = sizeof (adapterid);
152			if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
153			break;
154
155			/* Find out more about this adapter */
156
157			snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
158			REG_CONTROL_NET, adapterid);
159
160			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
161			continue;
162
163			len = sizeof (adaptername);
164			err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
165
166			RegCloseKey (key2);
167
168			if (err)
169			continue;
170
171	pcg	1.4	if (conf.ifname)
172			{
173			if (strcmp (conf.ifname, adapterid))
174			continue;
175			}
176			else
177			{
178			found = true;
179			break;
180			}
181
182			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
183			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
184			OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
185	pcg	1.3	if (device_handle != INVALID_HANDLE_VALUE)
186			{
187			found = true;
188			break;
189			}
190	pcg	1.1	}
191	pcg	1.3
192			RegCloseKey (key);
193
194			if (!found)
195			{
196	pcg	1.6	slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
197	pcg	1.8	exit (EXIT_FAILURE);
198	pcg	1.3	}
199
200			/* Try to open the corresponding tap device */
201
202			if (device_handle == INVALID_HANDLE_VALUE)
203			{
204	pcg	1.6	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
205	pcg	1.3	device_handle =
206			CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
207			OPEN_EXISTING,
208			FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
209			}
210
211			if (device_handle == INVALID_HANDLE_VALUE)
212			{
213	pcg	1.6	slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
214			adaptername, tapname, wstrerror (GetLastError ()));
215	pcg	1.8	exit (EXIT_FAILURE);
216	pcg	1.3	}
217
218	pcg	1.6	strcpy (ifrname, (char *)tapname);
219	pcg	1.4
220	pcg	1.3	/* Get MAC address from tap device */
221
222	pcg	1.6	if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
223			&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
224			&len, 0))
225	pcg	1.3	{
226			slog (L_ERR,
227	pcg	1.6	_("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
228	pcg	1.5	adaptername, wstrerror (GetLastError ()));
229	pcg	1.8	exit (EXIT_FAILURE);
230	pcg	1.3	}
231	pcg	1.6
232			pipe (iopipe);
233			fd = iopipe[0];
234			pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);
235
236			send_event = CreateEvent (NULL, FALSE, FALSE, NULL);
237
238			thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL);
239
240			/* try to set driver media status to 'connected' */
241			ULONG status = TRUE;
242			DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
243			&status, sizeof (status),
244			&status, sizeof (status), &len, NULL);
245			// ignore error here on purpose
246	pcg	1.1	}
247
248			tap_device::~tap_device ()
249			{
250	pcg	1.6	close (iopipe[0]);
251			close (iopipe[1]);
252			CloseHandle (device_handle);
253			CloseHandle (send_event);
254	pcg	1.1	}
255
256			tap_packet *
257			tap_device::recv ()
258			{
259			tap_packet *pkt = new tap_packet;
260
261	pcg	1.6	if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
262			{
263			slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
264			delete pkt;
265			return 0;
266			}
267
268			if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
269	pcg	1.1	{
270	pcg	1.6	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
271			delete pkt;
272	pcg	1.1	return 0;
273			}
274	pcg	1.6
275	pcg	1.1	id2mac (THISNODE->id, &((*pkt)[6]));
276
277			if (pkt->is_arp ())
278			{
279	pcg	1.6	if (!memcmp (&(pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[22]));
280			if (!memcmp (&(pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[32]));
281	pcg	1.1	}
282
283			return pkt;
284			}
285
286			void
287	pcg	1.3	tap_device::send (tap_packet * pkt)
288	pcg	1.1	{
289	pcg	1.6	memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
290	pcg	1.1
291			if (pkt->is_arp ())
292			{
293	pcg	1.3	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
294	pcg	1.6	memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
295	pcg	1.1
296	pcg	1.3	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
297	pcg	1.6	memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
298	pcg	1.1	}
299
300	pcg	1.6	DWORD dlen;
301			OVERLAPPED overlapped;
302			overlapped.hEvent = send_event;
303	pcg	1.3
304	pcg	1.6	if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
305	pcg	1.3	{
306			if (GetLastError () == ERROR_IO_PENDING)
307	pcg	1.6	GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
308	pcg	1.3	else
309	pcg	1.6	slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
310			wstrerror (GetLastError ()));
311	pcg	1.3	}
312	pcg	1.1	}