/* device.c -- Interaction with Windows tap driver in a MinGW environment Copyright (C) 2002-2005 Ivo Timmermans, 2002-2009 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" #include #include #include "conf.h" #include "logger.h" #include "net.h" #include "route.h" #include "utils.h" #include "xalloc.h" #include "mingw/common.h" int device_fd = -1; static HANDLE device_handle = INVALID_HANDLE_VALUE; char *device = NULL; char *iface = NULL; static char *device_info = NULL; static uint64_t device_total_in = 0; static uint64_t device_total_out = 0; extern char *myport; static DWORD WINAPI tapreader(void *bla) { int status; long len; OVERLAPPED overlapped; vpn_packet_t packet; logger(LOG_DEBUG, "Tap reader running"); /* Read from tap device and send to parent */ overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); for(;;) { overlapped.Offset = 0; overlapped.OffsetHigh = 0; ResetEvent(overlapped.hEvent); status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped); if(!status) { if(GetLastError() == ERROR_IO_PENDING) { WaitForSingleObject(overlapped.hEvent, INFINITE); if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE)) continue; } else { logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return -1; } } EnterCriticalSection(&mutex); packet.len = len; packet.priority = 0; route(myself, &packet); LeaveCriticalSection(&mutex); } } bool setup_device(void) { HKEY key, key2; int i; char regpath[1024]; char adapterid[1024]; char adaptername[1024]; char tapname[1024]; long len; unsigned long status; bool found = false; int sock, err; HANDLE thread; struct addrinfo *ai; struct addrinfo hint = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_protocol = IPPROTO_TCP, .ai_flags = 0, }; get_config_string(lookup_config(config_tree, "Device"), &device); get_config_string(lookup_config(config_tree, "Interface"), &iface); /* Open registry and look for network adapters */ if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) { logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError())); return false; } for (i = 0; ; i++) { len = sizeof(adapterid); if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL)) break; /* Find out more about this adapter */ snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid); if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) continue; len = sizeof(adaptername); err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len); RegCloseKey(key2); if(err) continue; if(device) { if(!strcmp(device, adapterid)) { found = true; break; } else continue; } if(iface) { if(!strcmp(iface, adaptername)) { found = true; break; } else continue; } snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid); device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); if(device_handle != INVALID_HANDLE_VALUE) { found = true; break; } } RegCloseKey(key); if(!found) { logger(LOG_ERR, "No Windows tap device found!"); return false; } if(!device) device = xstrdup(adapterid); if(!iface) iface = xstrdup(adaptername); /* Try to open the corresponding tap device */ if(device_handle == INVALID_HANDLE_VALUE) { snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device); device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); } if(device_handle == INVALID_HANDLE_VALUE) { logger(LOG_ERR, "%s (%s) is not a usable Windows tap device: %s", device, iface, winerror(GetLastError())); return false; } /* Get MAC address from tap device */ if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) { logger(LOG_ERR, "Could not get MAC address from Windows tap device %s (%s): %s", device, iface, winerror(GetLastError())); return false; } if(routing_mode == RMODE_ROUTER) { overwrite_mac = 1; } /* Start the tap reader */ thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL); if(!thread) { logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError())); return false; } /* Set media status for newer TAP-Win32 devices */ status = true; DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL); device_info = "Windows tap device"; logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info); return true; } void close_device(void) { CloseHandle(device_handle); free(device); free(iface); } bool read_packet(vpn_packet_t *packet) { return false; } bool write_packet(vpn_packet_t *packet) { long lenout; OVERLAPPED overlapped = {0}; ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) { logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError())); return false; } device_total_out += packet->len; return true; } void dump_device_stats(void) { logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device); logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in); logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out); }