2 device.c -- Interaction with Windows tap driver in a MinGW environment
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2013 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.
21 #include "../system.h"
27 #include "../device.h"
28 #include "../logger.h"
33 #include "../xalloc.h"
38 static HANDLE device_handle
= INVALID_HANDLE_VALUE
;
41 static char *device_info
= NULL
;
43 static uint64_t device_total_in
= 0;
44 static uint64_t device_total_out
= 0;
48 static DWORD WINAPI
tapreader(void *bla
) {
51 OVERLAPPED overlapped
;
54 logger(DEBUG_ALWAYS
, LOG_DEBUG
, "Tap reader running");
56 /* Read from tap device and send to parent */
58 overlapped
.hEvent
= CreateEvent(NULL
, TRUE
, FALSE
, NULL
);
61 overlapped
.Offset
= 0;
62 overlapped
.OffsetHigh
= 0;
63 ResetEvent(overlapped
.hEvent
);
65 status
= ReadFile(device_handle
, (void *)packet
.data
, MTU
, &len
, &overlapped
);
68 if(GetLastError() == ERROR_IO_PENDING
) {
69 WaitForSingleObject(overlapped
.hEvent
, INFINITE
);
70 if(!GetOverlappedResult(device_handle
, &overlapped
, &len
, FALSE
))
73 logger(DEBUG_ALWAYS
, LOG_ERR
, "Error while reading from %s %s: %s", device_info
,
74 device
, strerror(errno
));
79 EnterCriticalSection(&mutex
);
82 route(myself
, &packet
);
84 LeaveCriticalSection(&mutex
);
88 static bool setup_device(void) {
94 char adaptername
[1024];
104 get_config_string(lookup_config(config_tree
, "Device"), &device
);
105 get_config_string(lookup_config(config_tree
, "Interface"), &iface
);
107 /* Open registry and look for network adapters */
109 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE
, NETWORK_CONNECTIONS_KEY
, 0, KEY_READ
, &key
)) {
110 logger(DEBUG_ALWAYS
, LOG_ERR
, "Unable to read registry: %s", winerror(GetLastError()));
115 len
= sizeof adapterid
;
116 if(RegEnumKeyEx(key
, i
, adapterid
, &len
, 0, 0, 0, NULL
))
119 /* Find out more about this adapter */
121 snprintf(regpath
, sizeof regpath
, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY
, adapterid
);
123 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE
, regpath
, 0, KEY_READ
, &key2
))
126 len
= sizeof adaptername
;
127 err
= RegQueryValueEx(key2
, "Name", 0, 0, (LPBYTE
)adaptername
, &len
);
135 if(!strcmp(device
, adapterid
)) {
143 if(!strcmp(iface
, adaptername
)) {
150 snprintf(tapname
, sizeof tapname
, USERMODEDEVICEDIR
"%s" TAPSUFFIX
, adapterid
);
151 device_handle
= CreateFile(tapname
, GENERIC_WRITE
| GENERIC_READ
, 0, 0, OPEN_EXISTING
, FILE_ATTRIBUTE_SYSTEM
| FILE_FLAG_OVERLAPPED
, 0);
152 if(device_handle
!= INVALID_HANDLE_VALUE
) {
161 logger(DEBUG_ALWAYS
, LOG_ERR
, "No Windows tap device found!");
166 device
= xstrdup(adapterid
);
169 iface
= xstrdup(adaptername
);
171 /* Try to open the corresponding tap device */
173 if(device_handle
== INVALID_HANDLE_VALUE
) {
174 snprintf(tapname
, sizeof tapname
, USERMODEDEVICEDIR
"%s" TAPSUFFIX
, device
);
175 device_handle
= CreateFile(tapname
, GENERIC_WRITE
| GENERIC_READ
, 0, 0, OPEN_EXISTING
, FILE_ATTRIBUTE_SYSTEM
| FILE_FLAG_OVERLAPPED
, 0);
178 if(device_handle
== INVALID_HANDLE_VALUE
) {
179 logger(DEBUG_ALWAYS
, LOG_ERR
, "%s (%s) is not a usable Windows tap device: %s", device
, iface
, winerror(GetLastError()));
183 /* Get MAC address from tap device */
185 if(!DeviceIoControl(device_handle
, TAP_IOCTL_GET_MAC
, mymac
.x
, sizeof mymac
.x
, mymac
.x
, sizeof mymac
.x
, &len
, 0)) {
186 logger(DEBUG_ALWAYS
, LOG_ERR
, "Could not get MAC address from Windows tap device %s (%s): %s", device
, iface
, winerror(GetLastError()));
190 if(routing_mode
== RMODE_ROUTER
) {
194 /* Start the tap reader */
196 thread
= CreateThread(NULL
, 0, tapreader
, NULL
, 0, NULL
);
199 logger(DEBUG_ALWAYS
, LOG_ERR
, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
203 /* Set media status for newer TAP-Win32 devices */
206 DeviceIoControl(device_handle
, TAP_IOCTL_SET_MEDIA_STATUS
, &status
, sizeof status
, &status
, sizeof status
, &len
, NULL
);
208 device_info
= "Windows tap device";
210 logger(DEBUG_ALWAYS
, LOG_INFO
, "%s (%s) is a %s", device
, iface
, device_info
);
215 static void close_device(void) {
216 CloseHandle(device_handle
);
222 static bool read_packet(vpn_packet_t
*packet
) {
226 static bool write_packet(vpn_packet_t
*packet
) {
228 OVERLAPPED overlapped
= {0};
230 logger(DEBUG_TRAFFIC
, LOG_DEBUG
, "Writing packet of %d bytes to %s",
231 packet
->len
, device_info
);
233 if(!WriteFile(device_handle
, packet
->data
, packet
->len
, &outlen
, &overlapped
)) {
234 logger(DEBUG_ALWAYS
, LOG_ERR
, "Error while writing to %s %s: %s", device_info
, device
, winerror(GetLastError()));
238 device_total_out
+= packet
->len
;
243 static void dump_device_stats(void) {
244 logger(DEBUG_ALWAYS
, LOG_DEBUG
, "Statistics for %s %s:", device_info
, device
);
245 logger(DEBUG_ALWAYS
, LOG_DEBUG
, " total bytes in: %10"PRIu64
, device_total_in
);
246 logger(DEBUG_ALWAYS
, LOG_DEBUG
, " total bytes out: %10"PRIu64
, device_total_out
);
249 const devops_t os_devops
= {
250 .setup
= setup_device
,
251 .close
= close_device
,
253 .write
= write_packet
,
254 .dump_stats
= dump_device_stats
,