Remove use of bufferevents and evbuffers.
[tinc] / src / mingw / device.c
1 /*
2     device.c -- Interaction with Windows tap driver in a MinGW environment
3     Copyright (C) 2002-2005 Ivo Timmermans,
4                   2002-2009 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 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.
19 */
20
21 #include "system.h"
22
23 #include <windows.h>
24 #include <winioctl.h>
25
26 #include "conf.h"
27 #include "logger.h"
28 #include "net.h"
29 #include "route.h"
30 #include "utils.h"
31 #include "xalloc.h"
32
33 #include "mingw/common.h"
34
35 int device_fd = -1;
36 static HANDLE device_handle = INVALID_HANDLE_VALUE;
37 char *device = NULL;
38 char *iface = NULL;
39 static char *device_info = NULL;
40
41 static uint64_t device_total_in = 0;
42 static uint64_t device_total_out = 0;
43
44 extern char *myport;
45
46 static DWORD WINAPI tapreader(void *bla) {
47         int status;
48         long len;
49         OVERLAPPED overlapped;
50         vpn_packet_t packet;
51
52         logger(LOG_DEBUG, "Tap reader running");
53
54         /* Read from tap device and send to parent */
55
56         overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
57
58         for(;;) {
59                 overlapped.Offset = 0;
60                 overlapped.OffsetHigh = 0;
61                 ResetEvent(overlapped.hEvent);
62
63                 status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
64
65                 if(!status) {
66                         if(GetLastError() == ERROR_IO_PENDING) {
67                                 WaitForSingleObject(overlapped.hEvent, INFINITE);
68                                 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
69                                         continue;
70                         } else {
71                                 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
72                                            device, strerror(errno));
73                                 return -1;
74                         }
75                 }
76
77                 EnterCriticalSection(&mutex);
78                 packet.len = len;
79                 packet.priority = 0;
80                 route(myself, &packet);
81                 LeaveCriticalSection(&mutex);
82         }
83 }
84
85 bool setup_device(void) {
86         HKEY key, key2;
87         int i;
88
89         char regpath[1024];
90         char adapterid[1024];
91         char adaptername[1024];
92         char tapname[1024];
93         long len;
94         unsigned long status;
95
96         bool found = false;
97
98         int sock, err;
99         HANDLE thread;
100
101         struct addrinfo *ai;
102         struct addrinfo hint = {
103                 .ai_family = AF_UNSPEC,
104                 .ai_socktype = SOCK_STREAM,
105                 .ai_protocol = IPPROTO_TCP,
106                 .ai_flags = 0,
107         };
108
109         get_config_string(lookup_config(config_tree, "Device"), &device);
110         get_config_string(lookup_config(config_tree, "Interface"), &iface);
111
112         /* Open registry and look for network adapters */
113
114         if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
115                 logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError()));
116                 return false;
117         }
118
119         for (i = 0; ; i++) {
120                 len = sizeof adapterid;
121                 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
122                         break;
123
124                 /* Find out more about this adapter */
125
126                 snprintf(regpath, sizeof regpath, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
127
128                 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
129                         continue;
130
131                 len = sizeof adaptername;
132                 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
133
134                 RegCloseKey(key2);
135
136                 if(err)
137                         continue;
138
139                 if(device) {
140                         if(!strcmp(device, adapterid)) {
141                                 found = true;
142                                 break;
143                         } else
144                                 continue;
145                 }
146
147                 if(iface) {
148                         if(!strcmp(iface, adaptername)) {
149                                 found = true;
150                                 break;
151                         } else
152                                 continue;
153                 }
154
155                 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
156                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
157                 if(device_handle != INVALID_HANDLE_VALUE) {
158                         found = true;
159                         break;
160                 }
161         }
162
163         RegCloseKey(key);
164
165         if(!found) {
166                 logger(LOG_ERR, "No Windows tap device found!");
167                 return false;
168         }
169
170         if(!device)
171                 device = xstrdup(adapterid);
172
173         if(!iface)
174                 iface = xstrdup(adaptername);
175
176         /* Try to open the corresponding tap device */
177
178         if(device_handle == INVALID_HANDLE_VALUE) {
179                 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
180                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
181         }
182         
183         if(device_handle == INVALID_HANDLE_VALUE) {
184                 logger(LOG_ERR, "%s (%s) is not a usable Windows tap device: %s", device, iface, winerror(GetLastError()));
185                 return false;
186         }
187
188         /* Get MAC address from tap device */
189
190         if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof mymac.x, mymac.x, sizeof mymac.x, &len, 0)) {
191                 logger(LOG_ERR, "Could not get MAC address from Windows tap device %s (%s): %s", device, iface, winerror(GetLastError()));
192                 return false;
193         }
194
195         if(routing_mode == RMODE_ROUTER) {
196                 overwrite_mac = 1;
197         }
198
199         /* Start the tap reader */
200
201         thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
202
203         if(!thread) {
204                 logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
205                 return false;
206         }
207
208         /* Set media status for newer TAP-Win32 devices */
209
210         status = true;
211         DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
212
213         device_info = "Windows tap device";
214
215         logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
216
217         return true;
218 }
219
220 void close_device(void) {
221         CloseHandle(device_handle);
222
223         free(device);
224         free(iface);
225 }
226
227 bool read_packet(vpn_packet_t *packet) {
228         return false;
229 }
230
231 bool write_packet(vpn_packet_t *packet) {
232         long outlen;
233         OVERLAPPED overlapped = {0};
234
235         ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
236                            packet->len, device_info);
237
238         if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
239                 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
240                 return false;
241         }
242
243         device_total_out += packet->len;
244
245         return true;
246 }
247
248 void dump_device_stats(void) {
249         logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
250         logger(LOG_DEBUG, " total bytes in:  %10"PRIu64, device_total_in);
251         logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
252 }