2 device.c -- Interaction with Windows tap driver in a MinGW environment
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2007 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 char *device_info = NULL;
43 static int device_total_in = 0;
44 static int device_total_out = 0;
48 static struct packetbuf {
53 static int nbufs = 64;
55 DWORD WINAPI tapreader(void *bla) {
56 int sock, err, status;
58 struct addrinfo hint = {
59 .ai_family = AF_UNSPEC,
60 .ai_socktype = SOCK_STREAM,
61 .ai_protocol = IPPROTO_TCP,
64 unsigned char bufno = 0;
66 OVERLAPPED overlapped;
68 /* Open a socket to the parent process */
70 err = getaddrinfo(NULL, myport, &hint, &ai);
73 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
77 sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
80 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
85 if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
86 logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
93 logger(LOG_DEBUG, _("Tap reader running"));
95 /* Read from tap device and send to parent */
97 overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
100 overlapped.Offset = 0;
101 overlapped.OffsetHigh = 0;
102 ResetEvent(overlapped.hEvent);
104 status = ReadFile(device_handle, bufs[bufno].data, MTU, &len, &overlapped);
107 if(GetLastError() == ERROR_IO_PENDING) {
108 WaitForSingleObject(overlapped.hEvent, INFINITE);
109 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
112 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
113 device, strerror(errno));
118 bufs[bufno].len = len;
119 if(send(sock, &bufno, 1, 0) <= 0)
126 bool setup_device(void) {
131 char adapterid[1024];
132 char adaptername[1024];
135 unsigned long status;
143 struct addrinfo hint = {
144 .ai_family = AF_UNSPEC,
145 .ai_socktype = SOCK_STREAM,
146 .ai_protocol = IPPROTO_TCP,
152 get_config_string(lookup_config(config_tree, "Device"), &device);
153 get_config_string(lookup_config(config_tree, "Interface"), &iface);
155 /* Open registry and look for network adapters */
157 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
158 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
163 len = sizeof(adapterid);
164 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
167 /* Find out more about this adapter */
169 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
171 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
174 len = sizeof(adaptername);
175 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
183 if(!strcmp(device, adapterid)) {
191 if(!strcmp(iface, adaptername)) {
198 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
199 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
200 if(device_handle != INVALID_HANDLE_VALUE) {
209 logger(LOG_ERR, _("No Windows tap device found!"));
214 device = xstrdup(adapterid);
217 iface = xstrdup(adaptername);
219 /* Try to open the corresponding tap device */
221 if(device_handle == INVALID_HANDLE_VALUE) {
222 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
223 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
226 if(device_handle == INVALID_HANDLE_VALUE) {
227 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
231 /* Get MAC address from tap device */
233 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
234 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
238 if(routing_mode == RMODE_ROUTER) {
242 /* Set up ringbuffer */
244 get_config_int(lookup_config(config_tree, "RingBufferSize"), &nbufs);
250 bufs = xmalloc_and_zero(nbufs * sizeof *bufs);
252 /* Create a listening socket */
254 err = getaddrinfo(NULL, myport, &hint, &ai);
257 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
261 sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
264 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
268 if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
269 logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
275 if(listen(sock, 1)) {
276 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
280 /* Start the tap reader */
282 thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
285 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
289 /* Wait for the tap reader to connect back to us */
291 if((device_fd = accept(sock, NULL, 0)) == -1) {
292 logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
298 /* Set media status for newer TAP-Win32 devices */
301 DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
303 device_info = _("Windows tap device");
305 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
310 void close_device(void) {
313 CloseHandle(device_handle);
316 bool read_packet(vpn_packet_t *packet) {
321 if((recv(device_fd, &bufno, 1, 0)) <= 0) {
322 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
323 device, strerror(errno));
327 packet->len = bufs[bufno].len;
328 memcpy(packet->data, bufs[bufno].data, bufs[bufno].len);
330 device_total_in += packet->len;
332 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
338 bool write_packet(vpn_packet_t *packet) {
340 OVERLAPPED overlapped = {0};
344 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
345 packet->len, device_info);
347 if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
348 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
352 device_total_out += packet->len;
357 void dump_device_stats(void) {
360 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
361 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
362 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);