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 *
#	Content
1	/*
2	device-cygwin.C -- Stub for Cygwin environment
3	Copyright (C) 2003-2004 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 <cstdio>
34	#include <cstring>
35	#include <cstdlib>
36	#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	#include <io.h>
46	#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	#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
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	char *nl;
75	if ((nl = strchr (buf, '\r')))
76	*nl = '\0';
77
78	return buf;
79	}
80
81	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	exit (EXIT_FAILURE);
107	}
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	const char *
120	tap_device::info ()
121	{
122	return _("cygwin cipe/openvpn tap device");
123	}
124
125	tap_device::tap_device ()
126	{
127	HKEY key, key2;
128	int i;
129
130	char regpath[1024];
131	char adapterid[1024];
132	BYTE adaptername[1024];
133	char tapname[1024];
134	DWORD len;
135
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	slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
145	wstrerror (GetLastError ()));
146	exit (EXIT_FAILURE);
147	}
148
149	for (i = 0;; i++)
150	{
151	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	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	if (device_handle != INVALID_HANDLE_VALUE)
186	{
187	found = true;
188	break;
189	}
190	}
191
192	RegCloseKey (key);
193
194	if (!found)
195	{
196	slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
197	exit (EXIT_FAILURE);
198	}
199
200	/* Try to open the corresponding tap device */
201
202	if (device_handle == INVALID_HANDLE_VALUE)
203	{
204	snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
205	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	slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
214	adaptername, tapname, wstrerror (GetLastError ()));
215	exit (EXIT_FAILURE);
216	}
217
218	strcpy (ifrname, (char *)tapname);
219
220	/* Get MAC address from tap device */
221
222	if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
223	&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
224	&len, 0))
225	{
226	slog (L_ERR,
227	_("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
228	adaptername, wstrerror (GetLastError ()));
229	exit (EXIT_FAILURE);
230	}
231
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	}
247
248	tap_device::~tap_device ()
249	{
250	close (iopipe[0]);
251	close (iopipe[1]);
252	CloseHandle (device_handle);
253	CloseHandle (send_event);
254	}
255
256	tap_packet *
257	tap_device::recv ()
258	{
259	tap_packet *pkt = new tap_packet;
260
261	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	{
270	slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
271	delete pkt;
272	return 0;
273	}
274
275	id2mac (THISNODE->id, &((*pkt)[6]));
276
277	if (pkt->is_arp ())
278	{
279	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	}
282
283	return pkt;
284	}
285
286	void
287	tap_device::send (tap_packet * pkt)
288	{
289	memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
290
291	if (pkt->is_arp ())
292	{
293	if ((pkt)[22] == 0xfe && (pkt)[27] == THISNODE->id)
294	memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
295
296	if ((pkt)[32] == 0xfe && (pkt)[37] == THISNODE->id)
297	memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
298	}
299
300	DWORD dlen;
301	OVERLAPPED overlapped;
302	overlapped.hEvent = send_event;
303
304	if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
305	{
306	if (GetLastError () == ERROR_IO_PENDING)
307	GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
308	else
309	slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
310	wstrerror (GetLastError ()));
311	}
312	}