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Comparing gvpe/src/device-cygwin.C (file contents):
Revision 1.1 by pcg, Sat Mar 1 15:53:03 2003 UTC vs.
Revision 1.10 by pcg, Wed Mar 23 21:55:39 2005 UTC

1/* 1/*
2 device-cygwin.C -- Stub for Cygwin environment 2 device-cygwin.C -- Stub for Cygwin environment
3 Copyright (C) 2003 Marc Lehmann <ocg@goof.com> 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>
4 6
7 This file is part of GVPE.
8
5 This program is free software; you can redistribute it and/or modify 9 GVPE is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by 10 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or 11 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 12 (at your option) any later version.
9 13
10 This program is distributed in the hope that it will be useful, 14 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details. 17 GNU General Public License for more details.
14 18
15 You should have received a copy of the GNU General Public License 19 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software 20 along with gvpe; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 22*/
19 23
20// unfortunately, there is be no way to set MAC addresses under windows, 24// unfortunately, there is be no way to set MAC addresses under windows,
21// and the default cipedrvr uses a different MAC address than we do, 25// and the default cipedrvr uses a different MAC address than we do,
22// so this module tries to fix mac addresses in packets and arp packets. 26// so this module tries to fix mac addresses in packets and arp packets.
23// this is probably not very fast, but neither is cygwin nor poll. 27// this is probably not very fast, but neither is cygwin nor poll.
24// 28//
25// http://cipe-win32.sourceforge.net/ 29// http://cipe-win32.sourceforge.net/
30// a newer driver is available as part of the openvpn package:
31// http://openvpn.sf.net/
26 32
27#include "config.h" 33#include "config.h"
28 34
29#include <stdio.h> 35#include <cstdio>
36#include <cstring>
37#include <cstdlib>
30#include <errno.h> 38#include <errno.h>
31#include <sys/types.h> 39#include <sys/types.h>
32#include <sys/stat.h> 40#include <sys/stat.h>
33#include <fcntl.h> 41#include <fcntl.h>
34#include <unistd.h> 42#include <unistd.h>
35#include <syslog.h>
36#include <cstring>
37 43
38#include "conf.h" 44#include "conf.h"
39#include "util.h" 45#include "util.h"
40 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
64static const char *
65wstrerror (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
83static HANDLE device_handle = INVALID_HANDLE_VALUE;
84static mac local_mac;
85static tap_packet *rcv_pkt;
86static int iopipe[2];
87static HANDLE pipe_handle, send_event, thread;
88
89static DWORD WINAPI
90read_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
121const char *
122tap_device::info ()
123{
124 return _("cygwin cipe/openvpn tap device");
125}
126
127const char *
128tap_device::if_up ()
129{
130 return "";
131}
132
41tap_device::tap_device () 133tap_device::tap_device ()
42{ 134{
43 if ((fd = open (conf.ifname, O_RDWR)) < 0) 135 HKEY key, key2;
44 { 136 int i;
45 slog (L_CRIT, _("could not open %s: %s"), conf.ifname, strerror (errno)); 137
46 exit (1); 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))
47 } 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
48} 254}
49 255
50tap_device::~tap_device () 256tap_device::~tap_device ()
51{ 257{
52 close (fd); 258 close (iopipe[0]);
259 close (iopipe[1]);
260 CloseHandle (device_handle);
261 CloseHandle (send_event);
53} 262}
54 263
55tap_packet * 264tap_packet *
56tap_device::recv () 265tap_device::recv ()
57{ 266{
58 tap_packet *pkt = new tap_packet; 267 tap_packet *pkt = new tap_packet;
59 268
60 pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); 269 if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
61
62 if (pkt->len <= 0)
63 { 270 {
64 slog (L_ERR, _("error while reading from %s %s: %s"), 271 slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
65 info (), conf.ifname, strerror (errno)); 272 delete pkt;
66 free (pkt);
67 return 0; 273 return 0;
68 } 274 }
69 275
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
70 id2mac (THISNODE->id, &((*pkt)[6])); 283 id2mac (THISNODE->id, &((*pkt)[6]));
71 284
72 if (pkt->is_arp ()) 285 if (pkt->is_arp ())
73 { 286 {
74 if ((*pkt)[22] == 0x08) id2mac (THISNODE->id, &((*pkt)[22])); 287 if (!memcmp (&(*pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[22]));
75 if ((*pkt)[32] == 0x08) id2mac (THISNODE->id, &((*pkt)[32])); 288 if (!memcmp (&(*pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[32]));
76 } 289 }
77 290
78 return pkt; 291 return pkt;
79} 292}
80 293
81void 294void
82tap_device::send (tap_packet *pkt) 295tap_device::send (tap_packet * pkt)
83{ 296{
84 (*pkt)[ 6] = 0x08; (*pkt)[ 7] = 0x00; (*pkt)[ 8] = 0x58; 297 memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
85 (*pkt)[ 9] = 0x00; (*pkt)[10] = 0x00; (*pkt)[11] = 0x01;
86 298
87 if (pkt->is_arp ()) 299 if (pkt->is_arp ())
88 { 300 {
89 if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id) 301 if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id)
90 memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac)); 302 memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
91 303
92 if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id) 304 if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id)
93 memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac)); 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))
94 } 313 {
95 314 if (GetLastError () == ERROR_IO_PENDING)
96 if (write (fd, &((*pkt)[0]), pkt->len) < 0) 315 GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
316 else
97 slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname, 317 slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
98 strerror (errno)); 318 wstrerror (GetLastError ()));
319 }
99} 320}

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