tinc-vpn.org Git - tinc/blob - 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
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 #include <windows.h>
  26 #include <winioctl.h>
  27
  28 #include "conf.h"
  29 #include "logger.h"
  30 #include "net.h"
  31 #include "route.h"
  32 #include "utils.h"
  33 #include "xalloc.h"
  34
  35 #include "mingw/common.h"
  36
  37 int device_fd = -1;
  38 static HANDLE device_handle = INVALID_HANDLE_VALUE;
  39 char *device = NULL;
  40 char *iface = NULL;
  41 static char *device_info = NULL;
  42
  43 static int device_total_in = 0;
  44 static int device_total_out = 0;
  45
  46 extern char *myport;
  47
  48 static DWORD WINAPI tapreader(void *bla) {
  49         int status;
  50         long len;
  51         OVERLAPPED overlapped;
  52         vpn_packet_t packet;
  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                                 return -1;
  76                         }
  77                 }
  78
  79                 EnterCriticalSection(&mutex);
  80                 packet.len = len;
  81                 packet.priority = 0;
  82                 route(myself, &packet);
  83                 LeaveCriticalSection(&mutex);
  84         }
  85 }
  86
  87 bool setup_device(void) {
  88         HKEY key, key2;
  89         int i;
  90
  91         char regpath[1024];
  92         char adapterid[1024];
  93         char adaptername[1024];
  94         char tapname[1024];
  95         long len;
  96         unsigned long status;
  97
  98         bool found = false;
  99
 100         int sock, err;
 101         HANDLE thread;
 102
 103         struct addrinfo *ai;
 104         struct addrinfo hint = {
 105                 .ai_family = AF_UNSPEC,
 106                 .ai_socktype = SOCK_STREAM,
 107                 .ai_protocol = IPPROTO_TCP,
 108                 .ai_flags = 0,
 109         };
 110
 111         cp();
 112
 113         get_config_string(lookup_config(config_tree, "Device"), &device);
 114         get_config_string(lookup_config(config_tree, "Interface"), &iface);
 115
 116         /* Open registry and look for network adapters */
 117
 118         if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
 119                 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
 120                 return false;
 121         }
 122
 123         for (i = 0; ; i++) {
 124                 len = sizeof adapterid;
 125                 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
 126                         break;
 127
 128                 /* Find out more about this adapter */
 129
 130                 snprintf(regpath, sizeof regpath, "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
 131
 132                 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
 133                         continue;
 134
 135                 len = sizeof adaptername;
 136                 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
 137
 138                 RegCloseKey(key2);
 139
 140                 if(err)
 141                         continue;
 142
 143                 if(device) {
 144                         if(!strcmp(device, adapterid)) {
 145                                 found = true;
 146                                 break;
 147                         } else
 148                                 continue;
 149                 }
 150
 151                 if(iface) {
 152                         if(!strcmp(iface, adaptername)) {
 153                                 found = true;
 154                                 break;
 155                         } else
 156                                 continue;
 157                 }
 158
 159                 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
 160                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
 161                 if(device_handle != INVALID_HANDLE_VALUE) {
 162                         found = true;
 163                         break;
 164                 }
 165         }
 166
 167         RegCloseKey(key);
 168
 169         if(!found) {
 170                 logger(LOG_ERR, _("No Windows tap device found!"));
 171                 return false;
 172         }
 173
 174         if(!device)
 175                 device = xstrdup(adapterid);
 176
 177         if(!iface)
 178                 iface = xstrdup(adaptername);
 179
 180         /* Try to open the corresponding tap device */
 181
 182         if(device_handle == INVALID_HANDLE_VALUE) {
 183                 snprintf(tapname, sizeof tapname, USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
 184                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
 185         }
 186
 187         if(device_handle == INVALID_HANDLE_VALUE) {
 188                 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
 189                 return false;
 190         }
 191
 192         /* Get MAC address from tap device */
 193
 194         if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof mymac.x, mymac.x, sizeof mymac.x, &len, 0)) {
 195                 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
 196                 return false;
 197         }
 198
 199         if(routing_mode == RMODE_ROUTER) {
 200                 overwrite_mac = 1;
 201         }
 202
 203         /* Start the tap reader */
 204
 205         thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
 206
 207         if(!thread) {
 208                 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
 209                 return false;
 210         }
 211
 212         /* Set media status for newer TAP-Win32 devices */
 213
 214         status = true;
 215         DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
 216
 217         device_info = _("Windows tap device");
 218
 219         logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
 220
 221         return true;
 222 }
 223
 224 void close_device(void) {
 225         cp();
 226
 227         CloseHandle(device_handle);
 228
 229         free(device);
 230         free(iface);
 231 }
 232
 233 bool read_packet(vpn_packet_t *packet) {
 234         return false;
 235 }
 236
 237 bool write_packet(vpn_packet_t *packet) {
 238         long outlen;
 239         OVERLAPPED overlapped = {0};
 240
 241         cp();
 242
 243         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 244                            packet->len, device_info);
 245
 246         if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
 247                 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
 248                 return false;
 249         }
 250
 251         device_total_out += packet->len;
 252
 253         return true;
 254 }
 255
 256 void dump_device_stats(void) {
 257         cp();
 258
 259         logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
 260         logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
 261         logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
 262 }