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 <cstring>

#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 (1);
            }
        }

      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 (1);
    }

  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 (1);
    }

  /* 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 (1);
    }

  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 (1);
    }

  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:	1.6
Committed:	Wed Oct 15 06:06:41 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	poll-based-iom, VPE_1_2
Changes since 1.5:	+101 -148 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 <cstring>
40
41			#include "conf.h"
42			#include "util.h"
43
44	pcg	1.6	#include <io.h>
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	pcg	1.6	#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			#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)
60	pcg	1.3
61			static const char *
62			wstrerror (int err)
63			{
64			static char buf[1024];
65
66			if (!FormatMessage
67			(FORMAT_MESSAGE_FROM_SYSTEM \| FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
68			MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
69			{
70			strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
71			};
72
73	pcg	1.6	char *nl;
74			if ((nl = strchr (buf, '\r')))
75			*nl = '\0';
76	pcg	1.3
77			return buf;
78			}
79
80	pcg	1.6	static HANDLE device_handle = INVALID_HANDLE_VALUE;
81			static mac local_mac;
82			static tap_packet *rcv_pkt;
83			static int iopipe[2];
84			static HANDLE pipe_handle, send_event, thread;
85
86			static DWORD WINAPI
87			read_thread(void *)
88			{
89			static OVERLAPPED overlapped;
90			static DWORD dlen;
91			static u32 len;
92			static u8 data[MAX_MTU];
93
94			overlapped.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
95
96			for (;;)
97			{
98			if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped))
99			{
100			if (GetLastError () == ERROR_IO_PENDING)
101			GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
102			else
103			{
104			slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ()));
105			exit (1);
106			}
107			}
108
109			if (dlen > 0)
110			{
111			len = dlen;
112			WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL);
113			WriteFile (pipe_handle, data, len, &dlen, NULL);
114			}
115			}
116			}
117
118	pcg	1.2	const char *
119			tap_device::info ()
120			{
121	pcg	1.3	return _("cygwin cipe/openvpn tap device");
122	pcg	1.2	}
123
124	pcg	1.1	tap_device::tap_device ()
125			{
126	pcg	1.3	HKEY key, key2;
127			int i;
128
129			char regpath[1024];
130			char adapterid[1024];
131	pcg	1.6	BYTE adaptername[1024];
132	pcg	1.3	char tapname[1024];
133	pcg	1.6	DWORD len;
134	pcg	1.3
135			bool found = false;
136
137			int sock, err;
138
139			/* Open registry and look for network adapters */
140
141			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
142			{
143	pcg	1.6	slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
144	pcg	1.3	wstrerror (GetLastError ()));
145	pcg	1.6	exit (1);
146	pcg	1.3	}
147
148			for (i = 0;; i++)
149	pcg	1.1	{
150	pcg	1.3	len = sizeof (adapterid);
151			if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
152			break;
153
154			/* Find out more about this adapter */
155
156			snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
157			REG_CONTROL_NET, adapterid);
158
159			if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
160			continue;
161
162			len = sizeof (adaptername);
163			err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
164
165			RegCloseKey (key2);
166
167			if (err)
168			continue;
169
170	pcg	1.4	if (conf.ifname)
171			{
172			if (strcmp (conf.ifname, adapterid))
173			continue;
174			}
175			else
176			{
177			found = true;
178			break;
179			}
180
181			snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
182			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
183			OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
184	pcg	1.3	if (device_handle != INVALID_HANDLE_VALUE)
185			{
186			found = true;
187			break;
188			}
189	pcg	1.1	}
190	pcg	1.3
191			RegCloseKey (key);
192
193			if (!found)
194			{
195	pcg	1.6	slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
196	pcg	1.4	exit (1);
197	pcg	1.3	}
198
199			/* Try to open the corresponding tap device */
200
201			if (device_handle == INVALID_HANDLE_VALUE)
202			{
203	pcg	1.6	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
204	pcg	1.3	device_handle =
205			CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
206			OPEN_EXISTING,
207			FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
208			}
209
210			if (device_handle == INVALID_HANDLE_VALUE)
211			{
212	pcg	1.6	slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
213			adaptername, tapname, wstrerror (GetLastError ()));
214	pcg	1.4	exit (1);
215	pcg	1.3	}
216
217	pcg	1.6	strcpy (ifrname, (char *)tapname);
218	pcg	1.4
219	pcg	1.3	/* Get MAC address from tap device */
220
221	pcg	1.6	if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
222			&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
223			&len, 0))
224	pcg	1.3	{
225			slog (L_ERR,
226	pcg	1.6	_("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
227	pcg	1.5	adaptername, wstrerror (GetLastError ()));
228	pcg	1.4	exit (1);
229	pcg	1.3	}
230	pcg	1.6
231			pipe (iopipe);
232			fd = iopipe[0];
233			pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);
234
235			send_event = CreateEvent (NULL, FALSE, FALSE, NULL);
236
237			thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL);
238
239			/* try to set driver media status to 'connected' */
240			ULONG status = TRUE;
241			DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
242			&status, sizeof (status),
243			&status, sizeof (status), &len, NULL);
244			// ignore error here on purpose
245	pcg	1.1	}
246
247			tap_device::~tap_device ()
248			{
249	pcg	1.6	close (iopipe[0]);
250			close (iopipe[1]);
251			CloseHandle (device_handle);
252			CloseHandle (send_event);
253	pcg	1.1	}
254
255			tap_packet *
256			tap_device::recv ()
257			{
258			tap_packet *pkt = new tap_packet;
259
260	pcg	1.6	if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
261			{
262			slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
263			delete pkt;
264			return 0;
265			}
266
267			if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
268	pcg	1.1	{
269	pcg	1.6	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
270			delete pkt;
271	pcg	1.1	return 0;
272			}
273	pcg	1.6
274	pcg	1.1	id2mac (THISNODE->id, &((*pkt)[6]));
275
276			if (pkt->is_arp ())
277			{
278	pcg	1.6	if (!memcmp (&(pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[22]));
279			if (!memcmp (&(pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[32]));
280	pcg	1.1	}
281
282			return pkt;
283			}
284
285			void
286	pcg	1.3	tap_device::send (tap_packet * pkt)
287	pcg	1.1	{
288	pcg	1.6	memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
289	pcg	1.1
290			if (pkt->is_arp ())
291			{
292	pcg	1.3	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
293	pcg	1.6	memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
294	pcg	1.1
295	pcg	1.3	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
296	pcg	1.6	memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
297	pcg	1.1	}
298
299	pcg	1.6	DWORD dlen;
300			OVERLAPPED overlapped;
301			overlapped.hEvent = send_event;
302	pcg	1.3
303	pcg	1.6	if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
304	pcg	1.3	{
305			if (GetLastError () == ERROR_IO_PENDING)
306	pcg	1.6	GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
307	pcg	1.3	else
308	pcg	1.6	slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
309			wstrerror (GetLastError ()));
310	pcg	1.3	}
311	pcg	1.1	}