www.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 <ivo@tinc-vpn.org>,
   4                   2002-2005 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 = 0;
  38 static HANDLE device_handle = INVALID_HANDLE_VALUE;
  39 char *device = NULL;
  40 char *iface = NULL;
  41 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 DWORD WINAPI tapreader(void *bla) {
  49         int sock, err, status;
  50         struct addrinfo *ai;
  51         struct addrinfo hint = {
  52                 .ai_family = AF_UNSPEC,
  53                 .ai_socktype = SOCK_DGRAM,
  54                 .ai_protocol = IPPROTO_UDP,
  55                 .ai_flags = 0,
  56         };
  57         char buf[MTU];
  58         long len;
  59         OVERLAPPED overlapped;
  60
  61         /* Open a socket to the parent process */
  62
  63         err = getaddrinfo(NULL, myport, &hint, &ai);
  64
  65         if(err || !ai) {
  66                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
  67                 return -1;
  68         }
  69
  70         sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
  71
  72         freeaddrinfo(ai);
  73
  74         if(sock < 0) {
  75                 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
  76                 return -1;
  77         }
  78
  79         if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
  80                 logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno));
  81                 return -1;
  82         }
  83
  84         logger(LOG_DEBUG, _("Tap reader running"));
  85
  86         /* Read from tap device and send to parent */
  87
  88         overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
  89
  90         for(;;) {
  91                 overlapped.Offset = 0;
  92                 overlapped.OffsetHigh = 0;
  93                 ResetEvent(overlapped.hEvent);
  94
  95                 status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped);
  96
  97                 if(!status) {
  98                         if(GetLastError() == ERROR_IO_PENDING) {
  99                                 WaitForSingleObject(overlapped.hEvent, INFINITE);
 100                                 if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
 101                                         continue;
 102                         } else {
 103                                 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 104                                            device, strerror(errno));
 105                                 return -1;
 106                         }
 107                 }
 108
 109                 if(send(sock, buf, len, 0) <= 0)
 110                         return -1;
 111         }
 112 }
 113
 114 bool setup_device(void)
 115 {
 116         HKEY key, key2;
 117         int i;
 118
 119         char regpath[1024];
 120         char adapterid[1024];
 121         char adaptername[1024];
 122         char tapname[1024];
 123         long len;
 124         unsigned long status;
 125
 126         bool found = false;
 127
 128         int sock, err;
 129         HANDLE thread;
 130
 131         struct addrinfo *ai;
 132         struct addrinfo hint = {
 133                 .ai_family = AF_UNSPEC,
 134                 .ai_socktype = SOCK_DGRAM,
 135                 .ai_protocol = IPPROTO_UDP,
 136                 .ai_flags = 0,
 137         };
 138
 139         cp();
 140
 141         get_config_string(lookup_config(config_tree, "Device"), &device);
 142         get_config_string(lookup_config(config_tree, "Interface"), &iface);
 143
 144         /* Open registry and look for network adapters */
 145
 146         if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
 147                 logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
 148                 return false;
 149         }
 150
 151         for (i = 0; ; i++) {
 152                 len = sizeof(adapterid);
 153                 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
 154                         break;
 155
 156                 /* Find out more about this adapter */
 157
 158                 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
 159
 160                 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
 161                         continue;
 162
 163                 len = sizeof(adaptername);
 164                 err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
 165
 166                 RegCloseKey(key2);
 167
 168                 if(err)
 169                         continue;
 170
 171                 if(device) {
 172                         if(!strcmp(device, adapterid)) {
 173                                 found = true;
 174                                 break;
 175                         } else
 176                                 continue;
 177                 }
 178
 179                 if(iface) {
 180                         if(!strcmp(iface, adaptername)) {
 181                                 found = true;
 182                                 break;
 183                         } else
 184                                 continue;
 185                 }
 186
 187                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
 188                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
 189                 if(device_handle != INVALID_HANDLE_VALUE) {
 190                         found = true;
 191                         break;
 192                 }
 193         }
 194
 195         RegCloseKey(key);
 196
 197         if(!found) {
 198                 logger(LOG_ERR, _("No Windows tap device found!"));
 199                 return false;
 200         }
 201
 202         if(!device)
 203                 device = xstrdup(adapterid);
 204
 205         if(!iface)
 206                 iface = xstrdup(adaptername);
 207
 208         /* Try to open the corresponding tap device */
 209
 210         if(device_handle == INVALID_HANDLE_VALUE) {
 211                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
 212                 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
 213         }
 214
 215         if(device_handle == INVALID_HANDLE_VALUE) {
 216                 logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError()));
 217                 return false;
 218         }
 219
 220         /* Get MAC address from tap device */
 221
 222         if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
 223                 logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError()));
 224                 return false;
 225         }
 226
 227         if(routing_mode == RMODE_ROUTER) {
 228                 overwrite_mac = 1;
 229         }
 230
 231         /* Create a listening socket */
 232
 233         err = getaddrinfo(NULL, myport, &hint, &ai);
 234
 235         if(err || !ai) {
 236                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno));
 237                 return false;
 238         }
 239
 240         sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 241
 242         if(sock < 0) {
 243                 logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno));
 244                 return false;
 245         }
 246
 247         if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
 248                 logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno));
 249                 return false;
 250         }
 251
 252         freeaddrinfo(ai);
 253
 254         if(listen(sock, 1)) {
 255                 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
 256                 return false;
 257         }
 258
 259         /* Start the tap reader */
 260
 261         thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
 262
 263         if(!thread) {
 264                 logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
 265                 return false;
 266         }
 267
 268         /* Wait for the tap reader to connect back to us */
 269
 270         if((device_fd = accept(sock, NULL, 0)) == -1) {
 271                 logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno));
 272                 return false;
 273         }
 274
 275         closesocket(sock);
 276
 277         /* Set media status for newer TAP-Win32 devices */
 278
 279         status = true;
 280         DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
 281
 282         device_info = _("Windows tap device");
 283
 284         logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
 285
 286         return true;
 287 }
 288
 289 void close_device(void)
 290 {
 291         cp();
 292
 293         CloseHandle(device_handle);
 294 }
 295
 296 bool read_packet(vpn_packet_t *packet)
 297 {
 298         int lenin;
 299
 300         cp();
 301
 302         if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
 303                 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 304                            device, strerror(errno));
 305                 return false;
 306         }
 307
 308         packet->len = lenin;
 309
 310         device_total_in += packet->len;
 311
 312         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
 313                            device_info);
 314
 315         return true;
 316 }
 317
 318 bool write_packet(vpn_packet_t *packet)
 319 {
 320         long lenout;
 321         OVERLAPPED overlapped = {0};
 322
 323         cp();
 324
 325         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 326                            packet->len, device_info);
 327
 328         if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
 329                 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
 330                 return false;
 331         }
 332
 333         device_total_out += packet->len;
 334
 335         return true;
 336 }
 337
 338 void dump_device_stats(void)
 339 {
 340         cp();
 341
 342         logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
 343         logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
 344         logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
 345 }