2 device.c -- Interaction with Windows tap driver in a Cygwin environment
3 Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2002-2003 Guus Sliepen <guus@sliepen.eu.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: device.c,v 1.1.2.14 2003/07/29 23:21:01 guus Exp $
25 #include <w32api/windows.h>
26 #include <w32api/winioctl.h>
35 #define NETCARD_REG_KEY_2000 "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
36 #define NETCARD_REG_KEY "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards"
37 #define REG_SERVICE_KEY "SYSTEM\\CurrentControlSet\\Services"
38 #define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
40 #define USERMODEDEVICEDIR "\\\\.\\"
41 #define SYSDEVICEDIR "\\Device\\"
42 #define USERDEVICEDIR "\\??\\"
43 #define TAPSUFFIX ".tap"
45 #define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
47 #define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
48 #define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
49 #define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
51 /* FIXME: This only works for Windows 2000 */
57 char *device_info = NULL;
59 int device_total_in = 0;
60 int device_total_out = 0;
67 bool setup_device(void)
74 char adaptername[1024];
83 get_config_string(lookup_config(config_tree, "Device"), &device);
84 get_config_string(lookup_config(config_tree, "Interface"), &iface);
86 /* Open registry and look for network adapters */
88 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) {
89 logger(LOG_ERR, _("Unable to read registry"));
94 len = sizeof(adapterid);
95 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
98 /* Find out more about this adapter */
100 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
102 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
105 len = sizeof(adaptername);
106 RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
111 if(!strcmp(device, adapterid)) {
119 if(!strcmp(iface, adaptername)) {
126 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
127 handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
128 if(handle != INVALID_HANDLE_VALUE) {
138 logger(LOG_ERR, _("No Windows tap device found!"));
143 device = xstrdup(adapterid);
146 iface = xstrdup(adaptername);
148 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
150 /* Now we are going to open this device twice: once for reading and once for writing.
151 We do this because apparently it isn't possible to check for activity in the select() loop.
152 Furthermore I don't really know how to do it the "Windows" way. */
154 if(socketpair(AF_UNIX, SOCK_DGRAM, PF_UNIX, sp)) {
155 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "socketpair", strerror(errno));
159 /* The parent opens the tap device for writing. */
161 handle = CreateFile(tapname, GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM , 0);
163 if(handle == INVALID_HANDLE_VALUE) {
164 logger(LOG_ERR, _("Could not open Windows tap device for writing!"));
170 /* Get MAC address from tap device */
172 if(!DeviceIoControl(handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
173 logger(LOG_ERR, _("Could not get MAC address from Windows tap device!"));
177 if(routing_mode == RMODE_ROUTER) {
181 /* Now we start the child */
185 if(reader_pid == -1) {
186 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "fork", strerror(errno));
191 /* The child opens the tap device for reading, blocking.
192 It passes everything it reads to the socket. */
199 handle = CreateFile(tapname, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
201 if(handle == INVALID_HANDLE_VALUE) {
202 logger(LOG_ERR, _("Could not open Windows tap device for reading!"));
204 write(sp[1], buf, 1);
208 logger(LOG_DEBUG, _("Tap reader forked and running."));
213 write(sp[1], buf, 1);
218 ReadFile(handle, buf, MTU, &lenin, NULL);
219 write(sp[1], buf, lenin);
223 read(device_fd, &gelukt, 1);
225 logger(LOG_DEBUG, _("Tap reader failed!"));
229 device_info = _("Windows tap device");
231 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
236 void close_device(void)
244 kill(reader_pid, SIGKILL);
247 bool read_packet(vpn_packet_t *packet)
253 if((lenin = read(sp[0], packet->data, MTU)) <= 0) {
254 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
255 device, strerror(errno));
261 device_total_in += packet->len;
263 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
269 bool write_packet(vpn_packet_t *packet)
275 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
276 packet->len, device_info);
278 if(!WriteFile (handle, packet->data, packet->len, &lenout, NULL)) {
279 logger(LOG_ERR, _("Error while writing to %s %s"), device_info, device);
283 device_total_out += packet->len;
288 void dump_device_stats(void)
292 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
293 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
294 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);