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 along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
33 #include "mingw/common.h"
36 static HANDLE device_handle = INVALID_HANDLE_VALUE;
39 static char *device_info = NULL;
41 static uint64_t device_total_in = 0;
42 static uint64_t device_total_out = 0;
46 static DWORD WINAPI tapreader(void *bla) {
49 OVERLAPPED overlapped;
52 logger(LOG_DEBUG, "Tap reader running");
54 /* Read from tap device and send to parent */
56 overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
59 overlapped.Offset = 0;
60 overlapped.OffsetHigh = 0;
61 ResetEvent(overlapped.hEvent);
63 status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
66 if(GetLastError() == ERROR_IO_PENDING) {
67 WaitForSingleObject(overlapped.hEvent, INFINITE);
68 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
71 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
72 device, strerror(errno));
77 EnterCriticalSection(&mutex);
80 route(myself, &packet);
81 LeaveCriticalSection(&mutex);
85 bool setup_device(void) {
91 char adaptername[1024];
102 struct addrinfo hint = {
103 .ai_family = AF_UNSPEC,
104 .ai_socktype = SOCK_STREAM,
105 .ai_protocol = IPPROTO_TCP,
109 get_config_string(lookup_config(config_tree, "Device"), &device);
110 get_config_string(lookup_config(config_tree, "Interface"), &iface);
112 /* Open registry and look for network adapters */
114 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
115 logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError()));
120 len = sizeof adapterid;
121 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
124 /* Find out more about this adapter */
126 snprintf(regpath, sizeof regpath, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
128 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
131 len = sizeof adaptername;
132 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
140 if(!strcmp(device, adapterid)) {
148 if(!strcmp(iface, adaptername)) {
155 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
156 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
157 if(device_handle != INVALID_HANDLE_VALUE) {
166 logger(LOG_ERR, "No Windows tap device found!");
171 device = xstrdup(adapterid);
174 iface = xstrdup(adaptername);
176 /* Try to open the corresponding tap device */
178 if(device_handle == INVALID_HANDLE_VALUE) {
179 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
180 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
183 if(device_handle == INVALID_HANDLE_VALUE) {
184 logger(LOG_ERR, "%s (%s) is not a usable Windows tap device: %s", device, iface, winerror(GetLastError()));
188 /* Get MAC address from tap device */
190 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof mymac.x, mymac.x, sizeof mymac.x, &len, 0)) {
191 logger(LOG_ERR, "Could not get MAC address from Windows tap device %s (%s): %s", device, iface, winerror(GetLastError()));
195 if(routing_mode == RMODE_ROUTER) {
199 /* Start the tap reader */
201 thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
204 logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
208 /* Set media status for newer TAP-Win32 devices */
211 DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
213 device_info = "Windows tap device";
215 logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
220 void close_device(void) {
221 CloseHandle(device_handle);
227 bool read_packet(vpn_packet_t *packet) {
231 bool write_packet(vpn_packet_t *packet) {
233 OVERLAPPED overlapped = {0};
235 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
236 packet->len, device_info);
238 if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
239 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
243 device_total_out += packet->len;
248 void dump_device_stats(void) {
249 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
250 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
251 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);