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 *
#	Content
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	}