2 device.c -- Interaction with Windows tap driver in a Cygwin environment
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2006 Guus Sliepen <guus@tinc-vpn.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.
25 #include <w32api/windows.h>
26 #include <w32api/winioctl.h>
35 #include "mingw/common.h"
38 static HANDLE device_handle = INVALID_HANDLE_VALUE;
41 static char *device_info = NULL;
43 static int device_total_in = 0;
44 static int device_total_out = 0;
46 static pid_t reader_pid;
49 bool setup_device(void)
56 char adaptername[1024];
65 get_config_string(lookup_config(config_tree, "Device"), &device);
66 get_config_string(lookup_config(config_tree, "Interface"), &iface);
68 /* Open registry and look for network adapters */
70 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
71 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
76 len = sizeof(adapterid);
77 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
80 /* Find out more about this adapter */
82 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
84 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
87 len = sizeof(adaptername);
88 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
96 if(!strcmp(device, adapterid)) {
104 if(!strcmp(iface, adaptername)) {
111 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
112 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
113 if(device_handle != INVALID_HANDLE_VALUE) {
114 CloseHandle(device_handle);
123 logger(LOG_ERR, _("No Windows tap device found!"));
128 device = xstrdup(adapterid);
131 iface = xstrdup(adaptername);
133 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
135 /* Now we are going to open this device twice: once for reading and once for writing.
136 We do this because apparently it isn't possible to check for activity in the select() loop.
137 Furthermore I don't really know how to do it the "Windows" way. */
139 if(socketpair(AF_UNIX, SOCK_DGRAM, PF_UNIX, sp)) {
140 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "socketpair", strerror(errno));
144 /* The parent opens the tap device for writing. */
146 device_handle = CreateFile(tapname, GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM , 0);
148 if(device_handle == INVALID_HANDLE_VALUE) {
149 logger(LOG_ERR, _("Could not open Windows tap device %s (%s) for writing: %s"), device, iface, winerror(GetLastError()));
155 /* Get MAC address from tap device */
157 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
158 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
162 if(routing_mode == RMODE_ROUTER) {
166 /* Now we start the child */
170 if(reader_pid == -1) {
171 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "fork", strerror(errno));
176 /* The child opens the tap device for reading, blocking.
177 It passes everything it reads to the socket. */
182 CloseHandle(device_handle);
184 device_handle = CreateFile(tapname, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
186 if(device_handle == INVALID_HANDLE_VALUE) {
187 logger(LOG_ERR, _("Could not open Windows tap device %s (%s) for reading: %s"), device, iface, winerror(GetLastError()));
189 write(sp[1], buf, 1);
193 logger(LOG_DEBUG, _("Tap reader forked and running."));
198 write(sp[1], buf, 1);
203 ReadFile(device_handle, buf, MTU, &lenin, NULL);
204 write(sp[1], buf, lenin);
208 read(device_fd, &gelukt, 1);
210 logger(LOG_DEBUG, _("Tap reader failed!"));
214 device_info = _("Windows tap device");
216 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
221 void close_device(void)
227 CloseHandle(device_handle);
229 kill(reader_pid, SIGKILL);
235 bool read_packet(vpn_packet_t *packet)
241 if((lenin = read(sp[0], packet->data, MTU)) <= 0) {
242 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
243 device, strerror(errno));
249 device_total_in += packet->len;
251 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
257 bool write_packet(vpn_packet_t *packet)
263 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
264 packet->len, device_info);
266 if(!WriteFile (device_handle, packet->data, packet->len, &lenout, NULL)) {
267 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
271 device_total_out += packet->len;
276 void dump_device_stats(void)
280 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
281 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
282 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);