2 device.c -- Interaction with Windows tap driver in a MinGW environment
3 Copyright (C) 2002-2005 Ivo Timmermans,
4 2002-2014 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
;
39 static io_t device_read_io
;
40 static OVERLAPPED device_read_overlapped
;
41 static vpn_packet_t device_read_packet
;
44 static char *device_info
= NULL
;
48 static void device_issue_read() {
49 device_read_overlapped
.Offset
= 0;
50 device_read_overlapped
.OffsetHigh
= 0;
55 status
= ReadFile(device_handle
, (void *)device_read_packet
.data
, MTU
, &len
, &device_read_overlapped
);
57 if (GetLastError() != ERROR_IO_PENDING
)
58 logger(DEBUG_ALWAYS
, LOG_ERR
, "Error while reading from %s %s: %s", device_info
,
59 device
, strerror(errno
));
63 device_read_packet
.len
= len
;
64 device_read_packet
.priority
= 0;
65 route(myself
, &device_read_packet
);
69 static void device_handle_read(void *data
, int flags
) {
70 ResetEvent(device_read_overlapped
.hEvent
);
73 if (!GetOverlappedResult(device_handle
, &device_read_overlapped
, &len
, FALSE
)) {
74 logger(DEBUG_ALWAYS
, LOG_ERR
, "Error getting read result from %s %s: %s", device_info
,
75 device
, strerror(errno
));
79 device_read_packet
.len
= len
;
80 device_read_packet
.priority
= 0;
81 route(myself
, &device_read_packet
);
85 static bool setup_device(void) {
91 char adaptername
[1024];
99 get_config_string(lookup_config(config_tree
, "Device"), &device
);
100 get_config_string(lookup_config(config_tree
, "Interface"), &iface
);
102 /* Open registry and look for network adapters */
104 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE
, NETWORK_CONNECTIONS_KEY
, 0, KEY_READ
, &key
)) {
105 logger(DEBUG_ALWAYS
, LOG_ERR
, "Unable to read registry: %s", winerror(GetLastError()));
110 len
= sizeof adapterid
;
111 if(RegEnumKeyEx(key
, i
, adapterid
, &len
, 0, 0, 0, NULL
))
114 /* Find out more about this adapter */
116 snprintf(regpath
, sizeof regpath
, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY
, adapterid
);
118 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE
, regpath
, 0, KEY_READ
, &key2
))
121 len
= sizeof adaptername
;
122 err
= RegQueryValueEx(key2
, "Name", 0, 0, (LPBYTE
)adaptername
, &len
);
130 if(!strcmp(device
, adapterid
)) {
138 if(!strcmp(iface
, adaptername
)) {
145 snprintf(tapname
, sizeof tapname
, USERMODEDEVICEDIR
"%s" TAPSUFFIX
, adapterid
);
146 device_handle
= CreateFile(tapname
, GENERIC_WRITE
| GENERIC_READ
, 0, 0, OPEN_EXISTING
, FILE_ATTRIBUTE_SYSTEM
| FILE_FLAG_OVERLAPPED
, 0);
147 if(device_handle
!= INVALID_HANDLE_VALUE
) {
156 logger(DEBUG_ALWAYS
, LOG_ERR
, "No Windows tap device found!");
161 device
= xstrdup(adapterid
);
164 iface
= xstrdup(adaptername
);
166 /* Try to open the corresponding tap device */
168 if(device_handle
== INVALID_HANDLE_VALUE
) {
169 snprintf(tapname
, sizeof tapname
, USERMODEDEVICEDIR
"%s" TAPSUFFIX
, device
);
170 device_handle
= CreateFile(tapname
, GENERIC_WRITE
| GENERIC_READ
, 0, 0, OPEN_EXISTING
, FILE_ATTRIBUTE_SYSTEM
| FILE_FLAG_OVERLAPPED
, 0);
173 if(device_handle
== INVALID_HANDLE_VALUE
) {
174 logger(DEBUG_ALWAYS
, LOG_ERR
, "%s (%s) is not a usable Windows tap device: %s", device
, iface
, winerror(GetLastError()));
178 /* Get MAC address from tap device */
180 if(!DeviceIoControl(device_handle
, TAP_IOCTL_GET_MAC
, mymac
.x
, sizeof mymac
.x
, mymac
.x
, sizeof mymac
.x
, &len
, 0)) {
181 logger(DEBUG_ALWAYS
, LOG_ERR
, "Could not get MAC address from Windows tap device %s (%s): %s", device
, iface
, winerror(GetLastError()));
185 if(routing_mode
== RMODE_ROUTER
) {
189 device_info
= "Windows tap device";
191 logger(DEBUG_ALWAYS
, LOG_INFO
, "%s (%s) is a %s", device
, iface
, device_info
);
196 static void enable_device(void) {
197 logger(DEBUG_ALWAYS
, LOG_INFO
, "Enabling %s", device_info
);
201 DeviceIoControl(device_handle
, TAP_IOCTL_SET_MEDIA_STATUS
, &status
, sizeof status
, &status
, sizeof status
, &len
, NULL
);
203 io_add_event(&device_read_io
, device_handle_read
, NULL
, CreateEvent(NULL
, TRUE
, FALSE
, NULL
));
204 device_read_overlapped
.hEvent
= device_read_io
.event
;
208 static void disable_device(void) {
209 logger(DEBUG_ALWAYS
, LOG_INFO
, "Disabling %s", device_info
);
211 io_del(&device_read_io
);
212 CancelIo(device_handle
);
213 CloseHandle(device_read_overlapped
.hEvent
);
217 DeviceIoControl(device_handle
, TAP_IOCTL_SET_MEDIA_STATUS
, &status
, sizeof status
, &status
, sizeof status
, &len
, NULL
);
220 static void close_device(void) {
221 CloseHandle(device_handle
); device_handle
= INVALID_HANDLE_VALUE
;
223 free(device
); device
= NULL
;
224 free(iface
); iface
= NULL
;
228 static bool read_packet(vpn_packet_t
*packet
) {
232 static bool write_packet(vpn_packet_t
*packet
) {
234 OVERLAPPED overlapped
= {0};
236 logger(DEBUG_TRAFFIC
, LOG_DEBUG
, "Writing packet of %d bytes to %s",
237 packet
->len
, device_info
);
239 if(!WriteFile(device_handle
, DATA(packet
), packet
->len
, &outlen
, &overlapped
)) {
240 logger(DEBUG_ALWAYS
, LOG_ERR
, "Error while writing to %s %s: %s", device_info
, device
, winerror(GetLastError()));
247 const devops_t os_devops
= {
248 .setup
= setup_device
,
249 .close
= close_device
,
251 .write
= write_packet
,
252 .enable
= enable_device
,
253 .disable
= disable_device
,