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. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  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");
}

const char *
tap_device::if_up ()
{
  return "";
}

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:	1.11
Committed:	Tue Apr 26 00:55:56 2005 UTC (19 years, 1 month ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_01, rel-2_0
Changes since 1.10:	+1 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	device-cygwin.C -- Stub for Cygwin environment
3	Copyright (C) 2003-2005 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 file is part of GVPE.
8
9	GVPE is free software; you can redistribute it and/or modify
10	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	along with gvpe; if not, write to the Free Software
21	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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	// a newer driver is available as part of the openvpn package:
31	// http://openvpn.sf.net/
32
33	#include "config.h"
34
35	#include <cstdio>
36	#include <cstring>
37	#include <cstdlib>
38	#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	#include <io.h>
48	#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	#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
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	char *nl;
77	if ((nl = strchr (buf, '\r')))
78	*nl = '\0';
79
80	return buf;
81	}
82
83	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	exit (EXIT_FAILURE);
109	}
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	const char *
122	tap_device::info ()
123	{
124	return _("cygwin cipe/openvpn tap device");
125	}
126
127	const char *
128	tap_device::if_up ()
129	{
130	return "";
131	}
132
133	tap_device::tap_device ()
134	{
135	HKEY key, key2;
136	int i;
137
138	char regpath[1024];
139	char adapterid[1024];
140	BYTE adaptername[1024];
141	char tapname[1024];
142	DWORD len;
143
144	bool found = false;
145
146	int sock, err;
147
148	/* Open registry and look for network adapters */
149
150	if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
151	{
152	slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
153	wstrerror (GetLastError ()));
154	exit (EXIT_FAILURE);
155	}
156
157	for (i = 0;; i++)
158	{
159	len = sizeof (adapterid);
160	if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
161	break;
162
163	/* Find out more about this adapter */
164
165	snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
166	REG_CONTROL_NET, adapterid);
167
168	if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
169	continue;
170
171	len = sizeof (adaptername);
172	err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
173
174	RegCloseKey (key2);
175
176	if (err)
177	continue;
178
179	if (conf.ifname)
180	{
181	if (strcmp (conf.ifname, adapterid))
182	continue;
183	}
184	else
185	{
186	found = true;
187	break;
188	}
189
190	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
191	device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
192	OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
193	if (device_handle != INVALID_HANDLE_VALUE)
194	{
195	found = true;
196	break;
197	}
198	}
199
200	RegCloseKey (key);
201
202	if (!found)
203	{
204	slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
205	exit (EXIT_FAILURE);
206	}
207
208	/* Try to open the corresponding tap device */
209
210	if (device_handle == INVALID_HANDLE_VALUE)
211	{
212	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
213	device_handle =
214	CreateFile (tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0,
215	OPEN_EXISTING,
216	FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
217	}
218
219	if (device_handle == INVALID_HANDLE_VALUE)
220	{
221	slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
222	adaptername, tapname, wstrerror (GetLastError ()));
223	exit (EXIT_FAILURE);
224	}
225
226	strcpy (ifrname, (char *)tapname);
227
228	/* Get MAC address from tap device */
229
230	if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
231	&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
232	&len, 0))
233	{
234	slog (L_ERR,
235	_("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
236	adaptername, wstrerror (GetLastError ()));
237	exit (EXIT_FAILURE);
238	}
239
240	pipe (iopipe);
241	fd = iopipe[0];
242	pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);
243
244	send_event = CreateEvent (NULL, FALSE, FALSE, NULL);
245
246	thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL);
247
248	/* try to set driver media status to 'connected' */
249	ULONG status = TRUE;
250	DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
251	&status, sizeof (status),
252	&status, sizeof (status), &len, NULL);
253	// ignore error here on purpose
254	}
255
256	tap_device::~tap_device ()
257	{
258	close (iopipe[0]);
259	close (iopipe[1]);
260	CloseHandle (device_handle);
261	CloseHandle (send_event);
262	}
263
264	tap_packet *
265	tap_device::recv ()
266	{
267	tap_packet *pkt = new tap_packet;
268
269	if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
270	{
271	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
272	delete pkt;
273	return 0;
274	}
275
276	if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
277	{
278	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
279	delete pkt;
280	return 0;
281	}
282
283	id2mac (THISNODE->id, &((*pkt)[6]));
284
285	if (pkt->is_arp ())
286	{
287	if (!memcmp (&(pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[22]));
288	if (!memcmp (&(pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((pkt)[32]));
289	}
290
291	return pkt;
292	}
293
294	void
295	tap_device::send (tap_packet * pkt)
296	{
297	memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
298
299	if (pkt->is_arp ())
300	{
301	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
302	memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
303
304	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
305	memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
306	}
307
308	DWORD dlen;
309	OVERLAPPED overlapped;
310	overlapped.hEvent = send_event;
311
312	if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
313	{
314	if (GetLastError () == ERROR_IO_PENDING)
315	GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
316	else
317	slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
318	wstrerror (GetLastError ()));
319	}
320	}