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 *
#	Content
1	/*
2	device.c -- Interaction with Windows tap driver in a MinGW environment
3	Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
4	2002-2004 Guus Sliepen <guus@tinc-vpn.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 1400 2004-11-01 17:02:19Z guus $
21	*/
22
23	#include "system.h"
24
25	#include <windows.h>
26	#include <winioctl.h>
27
28	#include "tincd/mingw/common.h"
29
30	int device_fd = 0;
31	static HANDLE device_handle = INVALID_HANDLE_VALUE;
32	char *device = NULL;
33	char *iface = NULL;
34	char *device_info = NULL;
35
36	static int device_total_in = 0;
37	static int device_total_out = 0;
38
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	unsigned long status;
118
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	if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
140	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	snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
152
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	/* 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	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	}