1 |
pcg |
1.1 |
/* |
2 |
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device-cygwin.C -- Stub for Cygwin environment |
3 |
pcg |
1.7 |
Copyright (C) 2003-2004 Marc Lehmann <ocg@goof.com> |
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pcg |
1.3 |
Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>, |
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2002-2003 Guus Sliepen <guus@sliepen.eu.org> |
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pcg |
1.1 |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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// unfortunately, there is be no way to set MAC addresses under windows, |
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// and the default cipedrvr uses a different MAC address than we do, |
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// so this module tries to fix mac addresses in packets and arp packets. |
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// this is probably not very fast, but neither is cygwin nor poll. |
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// |
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// http://cipe-win32.sourceforge.net/ |
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pcg |
1.3 |
// a newer driver is available as part of the openvpn package: |
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// http://openvpn.sf.net/ |
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pcg |
1.1 |
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#include "config.h" |
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pcg |
1.8 |
#include <cstdio> |
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#include <cstring> |
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#include <cstdlib> |
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pcg |
1.1 |
#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include "conf.h" |
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#include "util.h" |
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pcg |
1.6 |
#include <io.h> |
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pcg |
1.3 |
#include <w32api/windows.h> |
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#include <w32api/winioctl.h> |
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#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}" |
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#define USERMODEDEVICEDIR "\\\\.\\" |
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#define USERDEVICEDIR "\\??\\" |
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#define TAPSUFFIX ".tap" |
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#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS) |
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pcg |
1.6 |
#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED) |
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#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED) |
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#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED) |
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#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED) |
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pcg |
1.3 |
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static const char * |
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wstrerror (int err) |
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{ |
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static char buf[1024]; |
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if (!FormatMessage |
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(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
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MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL)) |
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{ |
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strncpy (buf, _("(unable to format errormessage)"), sizeof (buf)); |
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}; |
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pcg |
1.6 |
char *nl; |
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if ((nl = strchr (buf, '\r'))) |
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*nl = '\0'; |
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pcg |
1.3 |
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return buf; |
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} |
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pcg |
1.6 |
static HANDLE device_handle = INVALID_HANDLE_VALUE; |
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static mac local_mac; |
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static tap_packet *rcv_pkt; |
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static int iopipe[2]; |
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static HANDLE pipe_handle, send_event, thread; |
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static DWORD WINAPI |
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read_thread(void *) |
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{ |
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static OVERLAPPED overlapped; |
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static DWORD dlen; |
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static u32 len; |
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static u8 data[MAX_MTU]; |
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overlapped.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL); |
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for (;;) |
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{ |
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if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped)) |
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{ |
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if (GetLastError () == ERROR_IO_PENDING) |
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GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE); |
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else |
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{ |
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slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ())); |
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pcg |
1.8 |
exit (EXIT_FAILURE); |
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pcg |
1.6 |
} |
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} |
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if (dlen > 0) |
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{ |
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len = dlen; |
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WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL); |
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WriteFile (pipe_handle, data, len, &dlen, NULL); |
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} |
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} |
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} |
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pcg |
1.2 |
const char * |
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tap_device::info () |
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{ |
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pcg |
1.3 |
return _("cygwin cipe/openvpn tap device"); |
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pcg |
1.2 |
} |
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pcg |
1.1 |
tap_device::tap_device () |
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{ |
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pcg |
1.3 |
HKEY key, key2; |
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int i; |
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char regpath[1024]; |
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char adapterid[1024]; |
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pcg |
1.6 |
BYTE adaptername[1024]; |
133 |
pcg |
1.3 |
char tapname[1024]; |
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pcg |
1.6 |
DWORD len; |
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pcg |
1.3 |
|
136 |
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bool found = false; |
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int sock, err; |
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/* Open registry and look for network adapters */ |
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if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) |
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{ |
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pcg |
1.6 |
slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"), |
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pcg |
1.3 |
wstrerror (GetLastError ())); |
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pcg |
1.8 |
exit (EXIT_FAILURE); |
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pcg |
1.3 |
} |
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for (i = 0;; i++) |
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pcg |
1.1 |
{ |
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pcg |
1.3 |
len = sizeof (adapterid); |
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if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL)) |
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break; |
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/* Find out more about this adapter */ |
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snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection", |
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REG_CONTROL_NET, adapterid); |
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if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) |
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continue; |
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len = sizeof (adaptername); |
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err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len); |
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RegCloseKey (key2); |
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if (err) |
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continue; |
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171 |
pcg |
1.4 |
if (conf.ifname) |
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{ |
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if (strcmp (conf.ifname, adapterid)) |
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continue; |
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} |
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else |
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{ |
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found = true; |
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break; |
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} |
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snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid); |
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device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, |
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OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); |
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pcg |
1.3 |
if (device_handle != INVALID_HANDLE_VALUE) |
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{ |
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found = true; |
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break; |
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} |
190 |
pcg |
1.1 |
} |
191 |
pcg |
1.3 |
|
192 |
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RegCloseKey (key); |
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if (!found) |
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{ |
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 |
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200 |
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/* Try to open the corresponding tap device */ |
201 |
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if (device_handle == INVALID_HANDLE_VALUE) |
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{ |
204 |
pcg |
1.6 |
snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid); |
205 |
pcg |
1.3 |
device_handle = |
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CreateFile (tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, |
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OPEN_EXISTING, |
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FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); |
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} |
210 |
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if (device_handle == INVALID_HANDLE_VALUE) |
212 |
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{ |
213 |
pcg |
1.6 |
slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"), |
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adaptername, tapname, wstrerror (GetLastError ())); |
215 |
pcg |
1.8 |
exit (EXIT_FAILURE); |
216 |
pcg |
1.3 |
} |
217 |
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218 |
pcg |
1.6 |
strcpy (ifrname, (char *)tapname); |
219 |
pcg |
1.4 |
|
220 |
pcg |
1.3 |
/* Get MAC address from tap device */ |
221 |
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222 |
pcg |
1.6 |
if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC, |
223 |
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&local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac), |
224 |
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&len, 0)) |
225 |
pcg |
1.3 |
{ |
226 |
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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 |
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pipe (iopipe); |
233 |
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fd = iopipe[0]; |
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pipe_handle = (HANDLE) get_osfhandle (iopipe[1]); |
235 |
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236 |
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send_event = CreateEvent (NULL, FALSE, FALSE, NULL); |
237 |
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238 |
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thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL); |
239 |
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240 |
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/* try to set driver media status to 'connected' */ |
241 |
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ULONG status = TRUE; |
242 |
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DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS, |
243 |
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&status, sizeof (status), |
244 |
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&status, sizeof (status), &len, NULL); |
245 |
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// ignore error here on purpose |
246 |
pcg |
1.1 |
} |
247 |
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248 |
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tap_device::~tap_device () |
249 |
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{ |
250 |
pcg |
1.6 |
close (iopipe[0]); |
251 |
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close (iopipe[1]); |
252 |
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CloseHandle (device_handle); |
253 |
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CloseHandle (send_event); |
254 |
pcg |
1.1 |
} |
255 |
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256 |
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tap_packet * |
257 |
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tap_device::recv () |
258 |
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{ |
259 |
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tap_packet *pkt = new tap_packet; |
260 |
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261 |
pcg |
1.6 |
if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32))) |
262 |
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{ |
263 |
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slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length")); |
264 |
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delete pkt; |
265 |
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return 0; |
266 |
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} |
267 |
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268 |
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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 |
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delete pkt; |
272 |
pcg |
1.1 |
return 0; |
273 |
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} |
274 |
pcg |
1.6 |
|
275 |
pcg |
1.1 |
id2mac (THISNODE->id, &((*pkt)[6])); |
276 |
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277 |
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if (pkt->is_arp ()) |
278 |
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{ |
279 |
pcg |
1.6 |
if (!memcmp (&(*pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[22])); |
280 |
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if (!memcmp (&(*pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[32])); |
281 |
pcg |
1.1 |
} |
282 |
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283 |
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return pkt; |
284 |
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} |
285 |
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286 |
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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 |
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if (pkt->is_arp ()) |
292 |
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{ |
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 |
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|
300 |
pcg |
1.6 |
DWORD dlen; |
301 |
|
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OVERLAPPED overlapped; |
302 |
|
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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 |
|
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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 |
|
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wstrerror (GetLastError ())); |
311 |
pcg |
1.3 |
} |
312 |
pcg |
1.1 |
} |