2 device.c -- Interaction with Windows tap driver in a Cygwin 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.
25 #include <w32api/windows.h>
26 #include <w32api/winioctl.h>
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;
46 static pid_t reader_pid;
49 bool setup_device(void) {
55 char adaptername[1024];
64 get_config_string(lookup_config(config_tree, "Device"), &device);
65 get_config_string(lookup_config(config_tree, "Interface"), &iface);
67 /* Open registry and look for network adapters */
69 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
70 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
75 len = sizeof adapterid;
76 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
79 /* Find out more about this adapter */
81 snprintf(regpath, sizeof regpath, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
83 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
86 len = sizeof adaptername;
87 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
95 if(!strcmp(device, adapterid)) {
103 if(!strcmp(iface, adaptername)) {
110 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
111 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
112 if(device_handle != INVALID_HANDLE_VALUE) {
113 CloseHandle(device_handle);
122 logger(LOG_ERR, _("No Windows tap device found!"));
127 device = xstrdup(adapterid);
130 iface = xstrdup(adaptername);
132 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
134 /* Now we are going to open this device twice: once for reading and once for writing.
135 We do this because apparently it isn't possible to check for activity in the select() loop.
136 Furthermore I don't really know how to do it the "Windows" way. */
138 if(socketpair(AF_UNIX, SOCK_DGRAM, PF_UNIX, sp)) {
139 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "socketpair", strerror(errno));
143 /* The parent opens the tap device for writing. */
145 device_handle = CreateFile(tapname, GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM , 0);
147 if(device_handle == INVALID_HANDLE_VALUE) {
148 logger(LOG_ERR, _("Could not open Windows tap device %s (%s) for writing: %s"), device, iface, winerror(GetLastError()));
154 /* Get MAC address from tap device */
156 if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof mymac.x, mymac.x, sizeof mymac.x, &len, 0)) {
157 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
161 if(routing_mode == RMODE_ROUTER) {
165 /* Now we start the child */
169 if(reader_pid == -1) {
170 logger(LOG_DEBUG, _("System call `%s' failed: %s"), "fork", strerror(errno));
175 /* The child opens the tap device for reading, blocking.
176 It passes everything it reads to the socket. */
181 CloseHandle(device_handle);
183 device_handle = CreateFile(tapname, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
185 if(device_handle == INVALID_HANDLE_VALUE) {
186 logger(LOG_ERR, _("Could not open Windows tap device %s (%s) for reading: %s"), device, iface, winerror(GetLastError()));
188 write(sp[1], buf, 1);
192 logger(LOG_DEBUG, _("Tap reader forked and running."));
197 write(sp[1], buf, 1);
202 ReadFile(device_handle, buf, MTU, &inlen, NULL);
203 write(sp[1], buf, inlen);
207 read(device_fd, &gelukt, 1);
209 logger(LOG_DEBUG, _("Tap reader failed!"));
213 device_info = _("Windows tap device");
215 logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
220 void close_device(void) {
225 CloseHandle(device_handle);
227 kill(reader_pid, SIGKILL);
233 bool read_packet(vpn_packet_t *packet) {
238 if((inlen = read(sp[0], packet->data, MTU)) <= 0) {
239 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
240 device, strerror(errno));
246 device_total_in += packet->len;
248 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
254 bool write_packet(vpn_packet_t *packet) {
259 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
260 packet->len, device_info);
262 if(!WriteFile (device_handle, packet->data, packet->len, &outlen, NULL)) {
263 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
267 device_total_out += packet->len;
272 void dump_device_stats(void) {
275 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
276 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
277 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);