Drop h and hh length modifiers from printf format strings.
[oweals/tinc.git] / 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                   2002-2013 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 "../device.h"
28 #include "../logger.h"
29 #include "../net.h"
30 #include "../route.h"
31 #include "../utils.h"
32 #include "../xalloc.h"
33
34 #include "common.h"
35
36 int device_fd = -1;
37 static HANDLE device_handle = INVALID_HANDLE_VALUE;
38 char *device = NULL;
39 char *iface = NULL;
40 static char *device_info = NULL;
41
42 static uint64_t device_total_in = 0;
43 static uint64_t device_total_out = 0;
44
45 extern char *myport;
46
47 static DWORD WINAPI tapreader(void *bla) {
48         int status;
49         DWORD len;
50         OVERLAPPED overlapped;
51         vpn_packet_t packet;
52         int errors;
53
54         logger(LOG_DEBUG, "Tap reader running");
55
56         /* Read from tap device and send to parent */
57
58         overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
59
60         for(;;) {
61                 overlapped.Offset = 0;
62                 overlapped.OffsetHigh = 0;
63                 ResetEvent(overlapped.hEvent);
64
65                 status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
66
67                 if(!status) {
68                         if(GetLastError() == ERROR_IO_PENDING) {
69                                 WaitForSingleObject(overlapped.hEvent, INFINITE);
70                                 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
71                                         continue;
72                         } else {
73                                 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
74                                            device, strerror(errno));
75                                 errors++;
76                                 if(errors >= 10) {
77                                         EnterCriticalSection(&mutex);
78                                         running = false;
79                                         LeaveCriticalSection(&mutex);
80                                 }
81                                 usleep(1000000);
82                                 continue;
83                         }
84                 }
85
86                 errors = 0;
87                 packet.len = len;
88                 packet.priority = 0;
89
90                 EnterCriticalSection(&mutex);
91                 route(myself, &packet);
92                 LeaveCriticalSection(&mutex);
93         }
94 }
95
96 static bool setup_device(void) {
97         HKEY key, key2;
98         int i;
99
100         char regpath[1024];
101         char adapterid[1024];
102         char adaptername[1024];
103         char tapname[1024];
104         DWORD len;
105         unsigned long status;
106
107         bool found = false;
108
109         int err;
110         HANDLE thread;
111
112         get_config_string(lookup_config(config_tree, "Device"), &device);
113         get_config_string(lookup_config(config_tree, "Interface"), &iface);
114
115         /* Open registry and look for network adapters */
116
117         if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
118                 logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError()));
119                 return false;
120         }
121
122         for (i = 0; ; i++) {
123                 len = sizeof(adapterid);
124                 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
125                         break;
126
127                 /* Find out more about this adapter */
128
129                 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
130
131                 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
132                         continue;
133
134                 len = sizeof(adaptername);
135                 err = RegQueryValueEx(key2, "Name", 0, 0, (LPBYTE)adaptername, &len);
136
137                 RegCloseKey(key2);
138
139                 if(err)
140                         continue;
141
142                 if(device) {
143                         if(!strcmp(device, adapterid)) {
144                                 found = true;
145                                 break;
146                         } else
147                                 continue;
148                 }
149
150                 if(iface) {
151                         if(!strcmp(iface, adaptername)) {
152                                 found = true;
153                                 break;
154                         } else
155                                 continue;
156                 }
157
158                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
159                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
160                 if(device_handle != INVALID_HANDLE_VALUE) {
161                         found = true;
162                         break;
163                 }
164         }
165
166         RegCloseKey(key);
167
168         if(!found) {
169                 logger(LOG_ERR, "No Windows tap device found!");
170                 return false;
171         }
172
173         if(!device)
174                 device = xstrdup(adapterid);
175
176         if(!iface)
177                 iface = xstrdup(adaptername);
178
179         /* Try to open the corresponding tap device */
180
181         if(device_handle == INVALID_HANDLE_VALUE) {
182                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
183                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
184         }
185         
186         if(device_handle == INVALID_HANDLE_VALUE) {
187                 logger(LOG_ERR, "%s (%s) is not a usable Windows tap device: %s", device, iface, winerror(GetLastError()));
188                 return false;
189         }
190
191         /* Get MAC address from tap device */
192
193         if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
194                 logger(LOG_ERR, "Could not get MAC address from Windows tap device %s (%s): %s", device, iface, winerror(GetLastError()));
195                 return false;
196         }
197
198         if(routing_mode == RMODE_ROUTER) {
199                 overwrite_mac = 1;
200         }
201
202         /* Start the tap reader */
203
204         thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
205
206         if(!thread) {
207                 logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
208                 return false;
209         }
210
211         /* Set media status for newer TAP-Win32 devices */
212
213         status = true;
214         DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
215
216         device_info = "Windows tap device";
217
218         logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
219
220         return true;
221 }
222
223 static void close_device(void) {
224         CloseHandle(device_handle);
225
226         free(device);
227         free(iface);
228 }
229
230 static bool read_packet(vpn_packet_t *packet) {
231         return false;
232 }
233
234 static bool write_packet(vpn_packet_t *packet) {
235         DWORD lenout;
236         OVERLAPPED overlapped = {0};
237
238         ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
239                            packet->len, device_info);
240
241         if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
242                 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
243                 return false;
244         }
245
246         device_total_out += packet->len;
247
248         return true;
249 }
250
251 static void dump_device_stats(void) {
252         logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
253         logger(LOG_DEBUG, " total bytes in:  %10"PRIu64, device_total_in);
254         logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
255 }
256
257 const devops_t os_devops = {
258         .setup = setup_device,
259         .close = close_device,
260         .read = read_packet,
261         .write = write_packet,
262         .dump_stats = dump_device_stats,
263 };