tincd/mingw/device.c

/*
    device.c -- Interaction with Windows tap driver in a MinGW environment
    Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
                  2002-2004 Guus Sliepen <guus@tinc-vpn.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: device.c 1400 2004-11-01 17:02:19Z guus $
*/

#include "system.h"

#include <windows.h>
#include <winioctl.h>

#include "tincd/mingw/common.h"

int device_fd = 0;
static HANDLE device_handle = INVALID_HANDLE_VALUE;
char *device = NULL;
char *iface = NULL;
char *device_info = NULL;

static int device_total_in = 0;
static int device_total_out = 0;

extern char *myport;

DWORD WINAPI tapreader(void *bla) {
        int sock, err, status;
        struct addrinfo *ai;
        struct addrinfo hint = {
                .ai_family = AF_UNSPEC,
                .ai_socktype = SOCK_DGRAM,
                .ai_protocol = IPPROTO_UDP,
                .ai_flags = 0,
        };
        char buf[MTU];
        long len;
        OVERLAPPED overlapped;

        /* Open a socket to the parent process */

        err = getaddrinfo(NULL, myport, &hint, &ai);

        if(err || !ai) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
                return -1;
        }

        sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);

        freeaddrinfo(ai);

        if(sock < 0) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
                return -1;
        }

        if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
                return -1;
        }

        logger(LOG_DEBUG, _("Tap reader running"));

        /* Read from tap device and send to parent */

        overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
        
        for(;;) {
                overlapped.Offset = 0;
                overlapped.OffsetHigh = 0;
                ResetEvent(overlapped.hEvent);

                status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped);

                if(!status) {
                        if(GetLastError() == ERROR_IO_PENDING) {
                                WaitForSingleObject(overlapped.hEvent, INFINITE);
                                if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
                                        continue;
                        } else {
                                logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
                                           device, strerror(errno));
                                return -1;
                        }
                }

                if(send(sock, buf, len, 0) <= 0)
                        return -1;
        }
}

bool setup_device(void)
{
        HKEY key, key2;
        int i;

        char regpath[1024];
        char adapterid[1024];
        char adaptername[1024];
        char tapname[1024];
        long len;
        unsigned long status;

        bool found = false;

        int sock, err;
        HANDLE thread;

        struct addrinfo *ai;
        struct addrinfo hint = {
                .ai_family = AF_UNSPEC,
                .ai_socktype = SOCK_DGRAM,
                .ai_protocol = IPPROTO_UDP,
                .ai_flags = 0,
        };

        cp();

        get_config_string(lookup_config(config_tree, "Device"), &device);
        get_config_string(lookup_config(config_tree, "Interface"), &iface);

        /* Open registry and look for network adapters */

        if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
                logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
                return false;
        }

        for (i = 0; ; i++) {
                len = sizeof(adapterid);
                if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
                        break;

                /* Find out more about this adapter */

                snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);

                if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
                        continue;

                len = sizeof(adaptername);
                err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);

                RegCloseKey(key2);

                if(err)
                        continue;

                if(device) {
                        if(!strcmp(device, adapterid)) {
                                found = true;
                                break;
                        } else
                                continue;
                }

                if(iface) {
                        if(!strcmp(iface, adaptername)) {
                                found = true;
                                break;
                        } else
                                continue;
                }

                snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
                device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
                if(device_handle != INVALID_HANDLE_VALUE) {
                        found = true;
                        break;
                }
        }

        RegCloseKey(key);

        if(!found) {
                logger(LOG_ERR, _("No Windows tap device found!"));
                return false;
        }

        if(!device)
                device = xstrdup(adapterid);

        if(!iface)
                iface = xstrdup(adaptername);

        /* Try to open the corresponding tap device */

        if(device_handle == INVALID_HANDLE_VALUE) {
                snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
                device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
        }
        
        if(device_handle == INVALID_HANDLE_VALUE) {
                logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
                return false;
        }

        /* Get MAC address from tap device */

        if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
                logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
                return false;
        }

        if(routing_mode == RMODE_ROUTER) {
                overwrite_mac = 1;
        }

        /* Create a listening socket */

        err = getaddrinfo(NULL, myport, &hint, &ai);

        if(err || !ai) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
                return false;
        }

        sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);

        if(sock < 0) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
                return false;
        }

        if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
                return false;
        }

        freeaddrinfo(ai);

        if(listen(sock, 1)) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
                return false;
        }

        /* Start the tap reader */

        thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);

        if(!thread) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
                return false;
        }

        /* Wait for the tap reader to connect back to us */

        if((device_fd = accept(sock, NULL, 0)) == -1) {
                logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
                return false;
        }

        closesocket(sock);

        /* Set media status for newer TAP-Win32 devices */

        status = true;
        DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);

        device_info = _("Windows tap device");

        logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);

        return true;
}

void close_device(void)
{
        cp();

        CloseHandle(device_handle);
}

bool read_packet(vpn_packet_t *packet)
{
        int lenin;

        cp();

        if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
                logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
                           device, strerror(errno));
                return false;
        }
        
        packet->len = lenin;

        device_total_in += packet->len;

        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
                           device_info);

        return true;
}

bool write_packet(vpn_packet_t *packet)
{
        long lenout;
        OVERLAPPED overlapped = {0};

        cp();

        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
                           packet->len, device_info);

        if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
                logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
                return false;
        }

        device_total_out += packet->len;

        return true;
}

void dump_device_stats(void)
{
        cp();

        logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
        logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
        logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
}
Revision:	1.2
Committed:	Thu Mar 17 23:59:38 2005 UTC (19 years, 3 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_9, rel-1_8, rel-2_01, rel-3_0, rel-2_2, rel-2_0, rel-2_21, rel-2_22, rel-2_25, HEAD
Changes since 1.1:	+16 -20 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			device.c -- Interaction with Windows tap driver in a MinGW environment
3	pcg	1.2	Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
4			2002-2004 Guus Sliepen <guus@tinc-vpn.org>
5	pcg	1.1
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.
10
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.
15
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.
19
20	pcg	1.2	$Id: device.c 1400 2004-11-01 17:02:19Z guus $
21	pcg	1.1	*/
22
23	pcg	1.2	#include "system.h"
24	pcg	1.1
25			#include <windows.h>
26			#include <winioctl.h>
27
28	pcg	1.2	#include "tincd/mingw/common.h"
29	pcg	1.1
30			int device_fd = 0;
31	pcg	1.2	static HANDLE device_handle = INVALID_HANDLE_VALUE;
32	pcg	1.1	char *device = NULL;
33			char *iface = NULL;
34			char *device_info = NULL;
35
36	pcg	1.2	static int device_total_in = 0;
37			static int device_total_out = 0;
38	pcg	1.1
39			extern char *myport;
40
41			DWORD WINAPI tapreader(void *bla) {
42			int sock, err, status;
43			struct addrinfo *ai;
44			struct addrinfo hint = {
45			.ai_family = AF_UNSPEC,
46			.ai_socktype = SOCK_DGRAM,
47			.ai_protocol = IPPROTO_UDP,
48			.ai_flags = 0,
49			};
50			char buf[MTU];
51			long len;
52			OVERLAPPED overlapped;
53
54			/* Open a socket to the parent process */
55
56			err = getaddrinfo(NULL, myport, &hint, &ai);
57
58			if(err \|\| !ai) {
59			logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
60			return -1;
61			}
62
63			sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
64
65			freeaddrinfo(ai);
66
67			if(sock < 0) {
68			logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
69			return -1;
70			}
71
72			if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
73			logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
74			return -1;
75			}
76
77			logger(LOG_DEBUG, _("Tap reader running"));
78
79			/* Read from tap device and send to parent */
80
81			overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
82
83			for(;;) {
84			overlapped.Offset = 0;
85			overlapped.OffsetHigh = 0;
86			ResetEvent(overlapped.hEvent);
87
88			status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped);
89
90			if(!status) {
91			if(GetLastError() == ERROR_IO_PENDING) {
92			WaitForSingleObject(overlapped.hEvent, INFINITE);
93			if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
94			continue;
95			} else {
96			logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
97			device, strerror(errno));
98			return -1;
99			}
100			}
101
102			if(send(sock, buf, len, 0) <= 0)
103			return -1;
104			}
105			}
106
107			bool setup_device(void)
108			{
109			HKEY key, key2;
110			int i;
111
112			char regpath[1024];
113			char adapterid[1024];
114			char adaptername[1024];
115			char tapname[1024];
116			long len;
117	pcg	1.2	unsigned long status;
118	pcg	1.1
119			bool found = false;
120
121			int sock, err;
122			HANDLE thread;
123
124			struct addrinfo *ai;
125			struct addrinfo hint = {
126			.ai_family = AF_UNSPEC,
127			.ai_socktype = SOCK_DGRAM,
128			.ai_protocol = IPPROTO_UDP,
129			.ai_flags = 0,
130			};
131
132			cp();
133
134			get_config_string(lookup_config(config_tree, "Device"), &device);
135			get_config_string(lookup_config(config_tree, "Interface"), &iface);
136
137			/* Open registry and look for network adapters */
138
139	pcg	1.2	if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
140	pcg	1.1	logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
141			return false;
142			}
143
144			for (i = 0; ; i++) {
145			len = sizeof(adapterid);
146			if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
147			break;
148
149			/* Find out more about this adapter */
150
151	pcg	1.2	snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
152	pcg	1.1
153			if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
154			continue;
155
156			len = sizeof(adaptername);
157			err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
158
159			RegCloseKey(key2);
160
161			if(err)
162			continue;
163
164			if(device) {
165			if(!strcmp(device, adapterid)) {
166			found = true;
167			break;
168			} else
169			continue;
170			}
171
172			if(iface) {
173			if(!strcmp(iface, adaptername)) {
174			found = true;
175			break;
176			} else
177			continue;
178			}
179
180			snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
181			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
182			if(device_handle != INVALID_HANDLE_VALUE) {
183			found = true;
184			break;
185			}
186			}
187
188			RegCloseKey(key);
189
190			if(!found) {
191			logger(LOG_ERR, _("No Windows tap device found!"));
192			return false;
193			}
194
195			if(!device)
196			device = xstrdup(adapterid);
197
198			if(!iface)
199			iface = xstrdup(adaptername);
200
201			/* Try to open the corresponding tap device */
202
203			if(device_handle == INVALID_HANDLE_VALUE) {
204			snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
205			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
206			}
207
208			if(device_handle == INVALID_HANDLE_VALUE) {
209			logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
210			return false;
211			}
212
213			/* Get MAC address from tap device */
214
215			if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
216			logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
217			return false;
218			}
219
220			if(routing_mode == RMODE_ROUTER) {
221			overwrite_mac = 1;
222			}
223
224			/* Create a listening socket */
225
226			err = getaddrinfo(NULL, myport, &hint, &ai);
227
228			if(err \|\| !ai) {
229			logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
230			return false;
231			}
232
233			sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
234
235			if(sock < 0) {
236			logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
237			return false;
238			}
239
240			if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
241			logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
242			return false;
243			}
244
245			freeaddrinfo(ai);
246
247			if(listen(sock, 1)) {
248			logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
249			return false;
250			}
251
252			/* Start the tap reader */
253
254			thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
255
256			if(!thread) {
257			logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
258			return false;
259			}
260
261			/* Wait for the tap reader to connect back to us */
262
263			if((device_fd = accept(sock, NULL, 0)) == -1) {
264			logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
265			return false;
266			}
267
268			closesocket(sock);
269
270	pcg	1.2	/* Set media status for newer TAP-Win32 devices */
271
272			status = true;
273			DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
274
275	pcg	1.1	device_info = _("Windows tap device");
276
277			logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
278
279			return true;
280			}
281
282			void close_device(void)
283			{
284			cp();
285
286			CloseHandle(device_handle);
287			}
288
289			bool read_packet(vpn_packet_t *packet)
290			{
291			int lenin;
292
293			cp();
294
295			if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
296			logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
297			device, strerror(errno));
298			return false;
299			}
300
301			packet->len = lenin;
302
303			device_total_in += packet->len;
304
305			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
306			device_info);
307
308			return true;
309			}
310
311			bool write_packet(vpn_packet_t *packet)
312			{
313			long lenout;
314			OVERLAPPED overlapped = {0};
315
316			cp();
317
318			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
319			packet->len, device_info);
320
321			if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
322			logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
323			return false;
324			}
325
326			device_total_out += packet->len;
327
328			return true;
329			}
330
331			void dump_device_stats(void)
332			{
333			cp();
334
335			logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
336			logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
337			logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
338			}