2 device.c -- Interaction with Windows tap driver in a MinGW environment
3 Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2002-2003 Guus Sliepen <guus@sliepen.eu.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.
20 $Id: device.c,v 1.1.2.14 2003/10/08 11:37:53 guus Exp $
35 #define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
37 #define USERMODEDEVICEDIR "\\\\.\\"
38 #define USERDEVICEDIR "\\??\\"
39 #define TAPSUFFIX ".tap"
41 #define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
43 #define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
44 #define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
45 #define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
46 #define TAP_IOCTL_GET_VERSION TAP_CONTROL_CODE(3, METHOD_BUFFERED)
47 #define TAP_IOCTL_GET_MTU TAP_CONTROL_CODE(4, METHOD_BUFFERED)
48 #define TAP_IOCTL_GET_INFO TAP_CONTROL_CODE(5, METHOD_BUFFERED)
49 #define TAP_IOCTL_CONFIG_POINT_TO_POINT TAP_CONTROL_CODE(6, METHOD_BUFFERED)
50 #define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)
54 HANDLE device_handle = INVALID_HANDLE_VALUE;
57 char *device_info = NULL;
59 int device_total_in = 0;
60 int device_total_out = 0;
64 DWORD WINAPI tapreader(void *bla) {
65 int sock, err, status;
67 struct addrinfo hint = {
68 .ai_family = AF_UNSPEC,
69 .ai_socktype = SOCK_DGRAM,
70 .ai_protocol = IPPROTO_UDP,
75 OVERLAPPED overlapped;
77 /* Open a socket to the parent process */
79 err = getaddrinfo(NULL, myport, &hint, &ai);
82 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
86 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
91 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
95 if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
96 logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
100 logger(LOG_DEBUG, _("Tap reader running"));
102 /* Read from tap device and send to parent */
104 overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
107 overlapped.Offset = 0;
108 overlapped.OffsetHigh = 0;
109 ResetEvent(overlapped.hEvent);
111 status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped);
114 if(GetLastError() == ERROR_IO_PENDING) {
115 WaitForSingleObject(overlapped.hEvent, INFINITE);
116 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
119 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
120 device, strerror(errno));
125 if(send(sock, buf, len, 0) <= 0)
130 bool setup_device(void)
136 char adapterid[1024];
137 char adaptername[1024];
140 unsigned long status;
148 struct addrinfo hint = {
149 .ai_family = AF_UNSPEC,
150 .ai_socktype = SOCK_DGRAM,
151 .ai_protocol = IPPROTO_UDP,
157 get_config_string(lookup_config(config_tree, "Device"), &device);
158 get_config_string(lookup_config(config_tree, "Interface"), &iface);
160 /* Open registry and look for network adapters */
162 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) {
163 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
168 len = sizeof(adapterid);
169 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
172 /* Find out more about this adapter */
174 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
176 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
179 len = sizeof(adaptername);
180 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
188 if(!strcmp(device, adapterid)) {
196 if(!strcmp(iface, adaptername)) {
203 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
204 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
205 if(device_handle != INVALID_HANDLE_VALUE) {
214 logger(LOG_ERR, _("No Windows tap device found!"));
219 device = xstrdup(adapterid);
222 iface = xstrdup(adaptername);
224 /* Try to open the corresponding tap device */
226 if(device_handle == INVALID_HANDLE_VALUE) {
227 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
228 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
231 if(device_handle == INVALID_HANDLE_VALUE) {
232 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
236 /* Get MAC address from tap device */
238 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
239 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
243 if(routing_mode == RMODE_ROUTER) {
247 /* Create a listening socket */
249 err = getaddrinfo(NULL, myport, &hint, &ai);
252 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
256 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
259 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
263 if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
264 logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
270 if(listen(sock, 1)) {
271 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
275 /* Start the tap reader */
277 thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
280 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
284 /* Wait for the tap reader to connect back to us */
286 if((device_fd = accept(sock, NULL, 0)) == -1) {
287 logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
293 /* Set media status for newer TAP-Win32 devices */
296 DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
298 device_info = _("Windows tap device");
300 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
305 void close_device(void)
309 CloseHandle(device_handle);
312 bool read_packet(vpn_packet_t *packet)
318 if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
319 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
320 device, strerror(errno));
326 device_total_in += packet->len;
328 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
334 bool write_packet(vpn_packet_t *packet)
337 OVERLAPPED overlapped = {0};
341 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
342 packet->len, device_info);
344 if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
345 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
349 device_total_out += packet->len;
354 void dump_device_stats(void)
358 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
359 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
360 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);