www.tinc-vpn.org Git - tinc/blob - src/mingw/device.c

   1 /*
   2     device.c -- Interaction with CIPE 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 1.1.2.3 2003/07/28 21:54:03 guus Exp $
  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 #define NETCARD_REG_KEY_2000 "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
  36 #define NETCARD_REG_KEY      "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards"
  37 #define REG_SERVICE_KEY      "SYSTEM\\CurrentControlSet\\Services"
  38 #define REG_CONTROL_NET      "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
  39
  40 #define USERMODEDEVICEDIR "\\\\.\\"
  41 #define SYSDEVICEDIR  "\\Device\\"
  42 #define USERDEVICEDIR "\\??\\"
  43 #define TAPSUFFIX     ".tap"
  44
  45 #define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
  46
  47 #define TAP_IOCTL_GET_LASTMAC    TAP_CONTROL_CODE(0, METHOD_BUFFERED)
  48 #define TAP_IOCTL_GET_MAC        TAP_CONTROL_CODE(1, METHOD_BUFFERED)
  49 #define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
  50
  51 /* FIXME: This only works for Windows 2000 */
  52 #define OSTYPE 5
  53
  54 HANDLE device_fd = INVALID_HANDLE_VALUE;
  55 char *device = NULL;
  56 char *iface = NULL;
  57 char *device_info = NULL;
  58
  59 int device_total_in = 0;
  60 int device_total_out = 0;
  61
  62 bool setup_device(void)
  63 {
  64         HKEY key, key2;
  65         int i;
  66
  67         char regpath[1024];
  68         char adapterid[1024];
  69         char adaptername[1024];
  70         char tapname[1024];
  71         char gelukt = 0;
  72         long len;
  73
  74         bool found = false;
  75
  76         cp();
  77
  78         get_config_string(lookup_config(config_tree, "Device"), &device);
  79         get_config_string(lookup_config(config_tree, "Interface"), &iface);
  80
  81         /* Open registry and look for network adapters */
  82
  83         if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) {
  84                 logger(LOG_ERR, _("Unable to read registry"));
  85                 return false;
  86         }
  87
  88         for (i = 0; ; i++) {
  89                 len = sizeof(adapterid);
  90                 if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
  91                         break;
  92
  93                 if(device) {
  94                         if(!strcmp(device, adapterid)) {
  95                                 found = true;
  96                                 break;
  97                         } else
  98                                 continue;
  99                 }
 100
 101                 /* Find out more about this adapter */
 102
 103                 snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
 104
 105                 if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) {
 106                         logger(LOG_ERR, _("Unable to read registry"));
 107                         return false;
 108                 }
 109
 110                 len = sizeof(adaptername);
 111                 RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
 112
 113                 if(iface) {
 114                         if(!strcmp(iface, adaptername)) {
 115                                 found = true;
 116                                 break;
 117                         } else
 118                                 continue;
 119                 }
 120
 121                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
 122                 device_fd = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
 123                 if(device_fd != INVALID_HANDLE_VALUE) {
 124                         found = true;
 125                         break;
 126                 }
 127         }
 128
 129         if(!found) {
 130                 logger(LOG_ERR, _("No Windows tap device found!"));
 131                 return false;
 132         }
 133
 134         device = adapterid;
 135         iface = adaptername;
 136
 137         /* Try to open the corresponding tap device */
 138
 139         if(device_fd == INVALID_HANDLE_VALUE) {
 140                 snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
 141                 device_fd = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
 142         }
 143
 144         if(device_fd == INVALID_HANDLE_VALUE) {
 145                 logger(LOG_ERR, _("%s (%s) is no a usable Windows tap device!"), device, iface);
 146                 return false;
 147         }
 148
 149         /* Get MAC address from tap device */
 150
 151         if(DeviceIoControl(device_fd, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
 152                 logger(LOG_ERR, _("Could not get MAC address from Windows tap device!"));
 153                 return false;
 154         }
 155
 156         if(routing_mode == RMODE_ROUTER) {
 157                 overwrite_mac = 1;
 158         }
 159
 160         if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
 161                 iface = device;
 162
 163         device_info = _("Windows tap device");
 164
 165         logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
 166
 167         return true;
 168 }
 169
 170 void close_device(void)
 171 {
 172         cp();
 173
 174         CloseHandle(device_fd);
 175 }
 176
 177 bool read_packet(vpn_packet_t *packet)
 178 {
 179         int lenin;
 180
 181         cp();
 182
 183         if(!ReadFile(device_fd, packet->data, MTU, &lenin, NULL)) {
 184                 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 185                            device, strerror(errno));
 186                 return false;
 187         }
 188
 189         packet->len = lenin;
 190
 191         device_total_in += packet->len;
 192
 193         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
 194                            device_info);
 195
 196         return true;
 197 }
 198
 199 bool write_packet(vpn_packet_t *packet)
 200 {
 201         int lenout;
 202
 203         cp();
 204
 205         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 206                            packet->len, device_info);
 207
 208         if(!WriteFile(device_fd, packet->data, packet->len, &lenout, NULL)) {
 209                 logger(LOG_ERR, "Error while writing to %s %s", device_info, device);
 210                 return false;
 211         }
 212
 213         device_total_out += packet->len;
 214
 215         return true;
 216 }
 217
 218 void dump_device_stats(void)
 219 {
 220         cp();
 221
 222         logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
 223         logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
 224         logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
 225 }