tincd/mingw/device.c

/*
    device.c -- Interaction with Windows tap driver in a MinGW environment
    Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
                  2002-2003 Guus Sliepen <guus@sliepen.eu.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,v 1.1.2.13 2003/08/08 19:49:47 guus Exp $
*/


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


#define REG_CONTROL_NET      "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"

#define USERMODEDEVICEDIR "\\\\.\\"
#define USERDEVICEDIR "\\??\\"
#define TAPSUFFIX     ".tap"

#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)

#define TAP_IOCTL_GET_LASTMAC    TAP_CONTROL_CODE(0, METHOD_BUFFERED)
#define TAP_IOCTL_GET_MAC        TAP_CONTROL_CODE(1, METHOD_BUFFERED)
#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)

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

int device_total_in = 0;
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;

        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, REG_CONTROL_NET, 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", REG_CONTROL_NET, 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);

        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:	1.1
Committed:	Tue Oct 14 03:22:09 2003 UTC (20 years, 8 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	poll-based-iom, VPE_1_2, VPE_1_4, VPE_1_6, rel-1_7, VPE-1_6_1
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			Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
4			2002-2003 Guus Sliepen <guus@sliepen.eu.org>
5
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			$Id: device.c,v 1.1.2.13 2003/08/08 19:49:47 guus Exp $
21			*/
22
23
24			#include <windows.h>
25			#include <winioctl.h>
26
27
28			#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
29
30			#define USERMODEDEVICEDIR "\\\\.\\"
31			#define USERDEVICEDIR "\\??\\"
32			#define TAPSUFFIX ".tap"
33
34			#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD \| 8000, request, method, FILE_ANY_ACCESS)
35
36			#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
37			#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
38			#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
39
40			int device_fd = 0;
41			HANDLE device_handle = INVALID_HANDLE_VALUE;
42			char *device = NULL;
43			char *iface = NULL;
44			char *device_info = NULL;
45
46			int device_total_in = 0;
47			int device_total_out = 0;
48
49			extern char *myport;
50
51			DWORD WINAPI tapreader(void *bla) {
52			int sock, err, status;
53			struct addrinfo *ai;
54			struct addrinfo hint = {
55			.ai_family = AF_UNSPEC,
56			.ai_socktype = SOCK_DGRAM,
57			.ai_protocol = IPPROTO_UDP,
58			.ai_flags = 0,
59			};
60			char buf[MTU];
61			long len;
62			OVERLAPPED overlapped;
63
64			/* Open a socket to the parent process */
65
66			err = getaddrinfo(NULL, myport, &hint, &ai);
67
68			if(err \|\| !ai) {
69			logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
70			return -1;
71			}
72
73			sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
74
75			freeaddrinfo(ai);
76
77			if(sock < 0) {
78			logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
79			return -1;
80			}
81
82			if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
83			logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
84			return -1;
85			}
86
87			logger(LOG_DEBUG, _("Tap reader running"));
88
89			/* Read from tap device and send to parent */
90
91			overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
92
93			for(;;) {
94			overlapped.Offset = 0;
95			overlapped.OffsetHigh = 0;
96			ResetEvent(overlapped.hEvent);
97
98			status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped);
99
100			if(!status) {
101			if(GetLastError() == ERROR_IO_PENDING) {
102			WaitForSingleObject(overlapped.hEvent, INFINITE);
103			if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
104			continue;
105			} else {
106			logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
107			device, strerror(errno));
108			return -1;
109			}
110			}
111
112			if(send(sock, buf, len, 0) <= 0)
113			return -1;
114			}
115			}
116
117			bool setup_device(void)
118			{
119			HKEY key, key2;
120			int i;
121
122			char regpath[1024];
123			char adapterid[1024];
124			char adaptername[1024];
125			char tapname[1024];
126			long len;
127
128			bool found = false;
129
130			int sock, err;
131			HANDLE thread;
132
133			struct addrinfo *ai;
134			struct addrinfo hint = {
135			.ai_family = AF_UNSPEC,
136			.ai_socktype = SOCK_DGRAM,
137			.ai_protocol = IPPROTO_UDP,
138			.ai_flags = 0,
139			};
140
141			cp();
142
143			get_config_string(lookup_config(config_tree, "Device"), &device);
144			get_config_string(lookup_config(config_tree, "Interface"), &iface);
145
146			/* Open registry and look for network adapters */
147
148			if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) {
149			logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
150			return false;
151			}
152
153			for (i = 0; ; i++) {
154			len = sizeof(adapterid);
155			if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
156			break;
157
158			/* Find out more about this adapter */
159
160			snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
161
162			if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
163			continue;
164
165			len = sizeof(adaptername);
166			err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
167
168			RegCloseKey(key2);
169
170			if(err)
171			continue;
172
173			if(device) {
174			if(!strcmp(device, adapterid)) {
175			found = true;
176			break;
177			} else
178			continue;
179			}
180
181			if(iface) {
182			if(!strcmp(iface, adaptername)) {
183			found = true;
184			break;
185			} else
186			continue;
187			}
188
189			snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
190			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
191			if(device_handle != INVALID_HANDLE_VALUE) {
192			found = true;
193			break;
194			}
195			}
196
197			RegCloseKey(key);
198
199			if(!found) {
200			logger(LOG_ERR, _("No Windows tap device found!"));
201			return false;
202			}
203
204			if(!device)
205			device = xstrdup(adapterid);
206
207			if(!iface)
208			iface = xstrdup(adaptername);
209
210			/* Try to open the corresponding tap device */
211
212			if(device_handle == INVALID_HANDLE_VALUE) {
213			snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
214			device_handle = CreateFile(tapname, GENERIC_WRITE \| GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
215			}
216
217			if(device_handle == INVALID_HANDLE_VALUE) {
218			logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
219			return false;
220			}
221
222			/* Get MAC address from tap device */
223
224			if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
225			logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
226			return false;
227			}
228
229			if(routing_mode == RMODE_ROUTER) {
230			overwrite_mac = 1;
231			}
232
233			/* Create a listening socket */
234
235			err = getaddrinfo(NULL, myport, &hint, &ai);
236
237			if(err \|\| !ai) {
238			logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
239			return false;
240			}
241
242			sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
243
244			if(sock < 0) {
245			logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
246			return false;
247			}
248
249			if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
250			logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
251			return false;
252			}
253
254			freeaddrinfo(ai);
255
256			if(listen(sock, 1)) {
257			logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
258			return false;
259			}
260
261			/* Start the tap reader */
262
263			thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
264
265			if(!thread) {
266			logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
267			return false;
268			}
269
270			/* Wait for the tap reader to connect back to us */
271
272			if((device_fd = accept(sock, NULL, 0)) == -1) {
273			logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
274			return false;
275			}
276
277			closesocket(sock);
278
279			device_info = _("Windows tap device");
280
281			logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
282
283			return true;
284			}
285
286			void close_device(void)
287			{
288			cp();
289
290			CloseHandle(device_handle);
291			}
292
293			bool read_packet(vpn_packet_t *packet)
294			{
295			int lenin;
296
297			cp();
298
299			if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
300			logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
301			device, strerror(errno));
302			return false;
303			}
304
305			packet->len = lenin;
306
307			device_total_in += packet->len;
308
309			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
310			device_info);
311
312			return true;
313			}
314
315			bool write_packet(vpn_packet_t *packet)
316			{
317			long lenout;
318			OVERLAPPED overlapped = {0};
319
320			cp();
321
322			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
323			packet->len, device_info);
324
325			if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
326			logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
327			return false;
328			}
329
330			device_total_out += packet->len;
331
332			return true;
333			}
334
335			void dump_device_stats(void)
336			{
337			cp();
338
339			logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
340			logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
341			logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
342			}