2 device.c -- Interaction with Windows tap driver in a MinGW environment
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2009 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.
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;
48 static DWORD WINAPI tapreader(void *bla) {
51 OVERLAPPED overlapped;
54 logger(LOG_DEBUG, _("Tap reader running"));
56 /* Read from tap device and send to parent */
58 overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
61 overlapped.Offset = 0;
62 overlapped.OffsetHigh = 0;
63 ResetEvent(overlapped.hEvent);
65 status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
68 if(GetLastError() == ERROR_IO_PENDING) {
69 WaitForSingleObject(overlapped.hEvent, INFINITE);
70 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
73 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
74 device, strerror(errno));
79 EnterCriticalSection(&mutex);
82 route(myself, &packet);
83 LeaveCriticalSection(&mutex);
87 bool setup_device(void) {
93 char adaptername[1024];
104 struct addrinfo hint = {
105 .ai_family = AF_UNSPEC,
106 .ai_socktype = SOCK_STREAM,
107 .ai_protocol = IPPROTO_TCP,
113 get_config_string(lookup_config(config_tree, "Device"), &device);
114 get_config_string(lookup_config(config_tree, "Interface"), &iface);
116 /* Open registry and look for network adapters */
118 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
119 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
124 len = sizeof adapterid;
125 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
128 /* Find out more about this adapter */
130 snprintf(regpath, sizeof regpath, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
132 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
135 len = sizeof adaptername;
136 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
144 if(!strcmp(device, adapterid)) {
152 if(!strcmp(iface, adaptername)) {
159 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
160 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
161 if(device_handle != INVALID_HANDLE_VALUE) {
170 logger(LOG_ERR, _("No Windows tap device found!"));
175 device = xstrdup(adapterid);
178 iface = xstrdup(adaptername);
180 /* Try to open the corresponding tap device */
182 if(device_handle == INVALID_HANDLE_VALUE) {
183 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
184 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
187 if(device_handle == INVALID_HANDLE_VALUE) {
188 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
192 /* Get MAC address from tap device */
194 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof mymac.x, mymac.x, sizeof mymac.x, &len, 0)) {
195 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
199 if(routing_mode == RMODE_ROUTER) {
203 /* Start the tap reader */
205 thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
208 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
212 /* Set media status for newer TAP-Win32 devices */
215 DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
217 device_info = _("Windows tap device");
219 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
224 void close_device(void) {
227 CloseHandle(device_handle);
233 bool read_packet(vpn_packet_t *packet) {
237 bool write_packet(vpn_packet_t *packet) {
239 OVERLAPPED overlapped = {0};
243 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
244 packet->len, device_info);
246 if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
247 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
251 device_total_out += packet->len;
256 void dump_device_stats(void) {
259 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
260 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
261 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);