2 device.c -- Interaction with Windows tap driver in a MinGW 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.
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);
82 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
86 if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
87 logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
91 logger(LOG_DEBUG, _("Tap reader running"));
93 /* Read from tap device and send to parent */
95 overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
98 overlapped.Offset = 0;
99 overlapped.OffsetHigh = 0;
100 ResetEvent(overlapped.hEvent);
102 status = ReadFile(device_handle, bufs[bufno].data, MTU, &len, &overlapped);
105 if(GetLastError() == ERROR_IO_PENDING) {
106 WaitForSingleObject(overlapped.hEvent, INFINITE);
107 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
110 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
111 device, strerror(errno));
116 bufs[bufno].len = len;
117 if(send(sock, &bufno, 1, 0) <= 0)
124 bool setup_device(void)
130 char adapterid[1024];
131 char adaptername[1024];
134 unsigned long status;
142 struct addrinfo hint = {
143 .ai_family = AF_UNSPEC,
144 .ai_socktype = SOCK_STREAM,
145 .ai_protocol = IPPROTO_TCP,
151 get_config_string(lookup_config(config_tree, "Device"), &device);
152 get_config_string(lookup_config(config_tree, "Interface"), &iface);
154 /* Open registry and look for network adapters */
156 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
157 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
162 len = sizeof(adapterid);
163 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
166 /* Find out more about this adapter */
168 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
170 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
173 len = sizeof(adaptername);
174 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
182 if(!strcmp(device, adapterid)) {
190 if(!strcmp(iface, adaptername)) {
197 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
198 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
199 if(device_handle != INVALID_HANDLE_VALUE) {
208 logger(LOG_ERR, _("No Windows tap device found!"));
213 device = xstrdup(adapterid);
216 iface = xstrdup(adaptername);
218 /* Try to open the corresponding tap device */
220 if(device_handle == INVALID_HANDLE_VALUE) {
221 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
222 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
225 if(device_handle == INVALID_HANDLE_VALUE) {
226 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
230 /* Get MAC address from tap device */
232 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
233 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
237 if(routing_mode == RMODE_ROUTER) {
241 /* Set up ringbuffer */
243 get_config_int(lookup_config(config_tree, "RingBufferSize"), &nbufs);
249 bufs = xmalloc_and_zero(nbufs * sizeof *bufs);
251 /* Create a listening socket */
253 err = getaddrinfo(NULL, myport, &hint, &ai);
256 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
260 sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
263 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
267 if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
268 logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
274 if(listen(sock, 1)) {
275 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
279 /* Start the tap reader */
281 thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
284 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
288 /* Wait for the tap reader to connect back to us */
290 if((device_fd = accept(sock, NULL, 0)) == -1) {
291 logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
297 /* Set media status for newer TAP-Win32 devices */
300 DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
302 device_info = _("Windows tap device");
304 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
309 void close_device(void)
313 CloseHandle(device_handle);
316 bool read_packet(vpn_packet_t *packet)
322 if((recv(device_fd, &bufno, 1, 0)) <= 0) {
323 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
324 device, strerror(errno));
328 packet->len = bufs[bufno].len;
329 memcpy(packet->data, bufs[bufno].data, bufs[bufno].len);
331 device_total_in += packet->len;
333 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
339 bool write_packet(vpn_packet_t *packet)
342 OVERLAPPED overlapped = {0};
346 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
347 packet->len, device_info);
349 if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
350 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
354 device_total_out += packet->len;
359 void dump_device_stats(void)
363 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
364 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
365 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);