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/* |
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* PearPC |
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* sysethtun.cc |
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* |
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* win32-specific ethernet-tunnel access |
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* |
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* Copyright (C) 2004 John Kelley (pearpc@kelley.ca) |
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* Copyright (C) 2004 Stefan Weyergraf |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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// FIXME: What about multiple instances of Win32EthTunDevice? |
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|
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#include <errno.h> |
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#include <stdio.h> |
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#include <winsock.h> |
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#include <windows.h> |
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#include <Winioctl.h> |
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|
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#undef FASTCALL |
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|
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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|
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#include "system/sysethtun.h" |
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#include "tools/except.h" |
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#include "tap_constants.h" |
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#include "tools/snprintf.h" |
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|
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//minimum version that we will work with |
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#define TAP_WIN32_MIN_MAJOR 7 |
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#define TAP_WIN32_MIN_MINOR 1 |
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|
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#define printm(s...) ht_printf("[TAP-WIN32]: "s) |
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#define MAX_PACKET_SIZE 16384 |
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#define ERRORMSG_SIZE 1024 |
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|
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//simple function to translate an error code into a string |
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static void getErrorString(char *out, int maxSize, DWORD error) |
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{ |
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, |
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NULL, |
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error, |
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language |
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(LPTSTR) out, |
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maxSize, |
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NULL); |
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} |
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//checks to see if a given NIC GUID is a TAP-WIN32 device |
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static bool is_tap_win32_dev(const char *guid) |
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{ |
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HKEY netcard_key; |
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LONG status; |
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DWORD len; |
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int i = 0; |
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|
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status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, ADAPTER_KEY, 0, KEY_READ, &netcard_key); |
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|
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if (status != ERROR_SUCCESS) { |
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printm("Error opening registry key: %s\n", ADAPTER_KEY); |
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return false; |
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} |
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|
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while (true) { |
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char enum_name[256]; |
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char unit_string[256]; |
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HKEY unit_key; |
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char component_id_string[] = "ComponentId"; |
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char component_id[256]; |
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char net_cfg_instance_id_string[] = "NetCfgInstanceId"; |
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char net_cfg_instance_id[256]; |
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DWORD data_type; |
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|
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len = sizeof (enum_name); |
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status = RegEnumKeyEx(netcard_key, i, enum_name, &len, NULL, NULL, NULL, NULL); |
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if (status == ERROR_NO_MORE_ITEMS) |
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break; |
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else if (status != ERROR_SUCCESS) { |
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printm("Error enumerating registry subkeys of key: %s\n", |
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ADAPTER_KEY); |
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return false; |
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} |
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|
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ht_snprintf(unit_string, sizeof(unit_string), "%s\\%s", ADAPTER_KEY, enum_name); |
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|
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status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, unit_string, 0, KEY_READ, &unit_key); |
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|
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if (status != ERROR_SUCCESS) { |
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printm("Error opening registry key: %s\n", unit_string); |
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return false; |
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} else { |
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len = sizeof (component_id); |
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status = RegQueryValueEx(unit_key, component_id_string, NULL, &data_type, (BYTE *)component_id, &len); |
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if (!(status != ERROR_SUCCESS || data_type != REG_SZ)) { |
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len = sizeof (net_cfg_instance_id); |
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status = RegQueryValueEx(unit_key, net_cfg_instance_id_string, NULL, &data_type, (BYTE *)net_cfg_instance_id, &len); |
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|
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if (status == ERROR_SUCCESS && data_type == REG_SZ) { |
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if (!strncmp(component_id, "tap", 3) |
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&& !strcmp(net_cfg_instance_id, guid)) { |
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RegCloseKey(unit_key); |
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RegCloseKey(netcard_key); |
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return true; |
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} |
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} |
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} |
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RegCloseKey(unit_key); |
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} |
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++i; |
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} |
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RegCloseKey(netcard_key); |
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return false; |
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} |
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|
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|
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static int get_device_guid(char *name, int name_size, char *actual_name, int actual_name_size) |
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{ |
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LONG status; |
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HKEY control_net_key; |
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DWORD len; |
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int i = 0; |
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bool stop = false; |
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|
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status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &control_net_key); |
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|
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if (status != ERROR_SUCCESS) { |
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printm("Error opening registry key: %s", NETWORK_CONNECTIONS_KEY); |
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return 1; |
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} |
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|
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while (!stop) { |
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char enum_name[256]; |
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char connection_string[256]; |
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HKEY connection_key; |
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char name_data[256]; |
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DWORD name_type; |
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const char name_string[] = "Name"; |
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|
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len = sizeof (enum_name); |
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status = RegEnumKeyEx(control_net_key, i, enum_name, &len, NULL, NULL, NULL, NULL); |
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|
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if (status == ERROR_NO_MORE_ITEMS) |
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break; |
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else if (status != ERROR_SUCCESS) { |
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printm("Error enumerating registry subkeys of key: %s", NETWORK_CONNECTIONS_KEY); |
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return 1; |
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} |
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|
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ht_snprintf(connection_string, sizeof(connection_string), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, enum_name); |
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status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, connection_string, 0, KEY_READ, &connection_key); |
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|
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if (status == ERROR_SUCCESS) { |
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len = sizeof (name_data); |
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status = RegQueryValueEx(connection_key, name_string, NULL, &name_type, (BYTE *)name_data, &len); |
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|
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if (status != ERROR_SUCCESS || name_type != REG_SZ) { |
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printm("Error opening registry key: %s\\%s\\%s", NETWORK_CONNECTIONS_KEY, connection_string, name_string); |
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return 1; |
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} else { |
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if (is_tap_win32_dev(enum_name)) { |
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printm("Found TAP device named '%s'\n", name_data); |
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ht_snprintf(name, name_size, "%s", enum_name); |
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if (actual_name) |
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ht_snprintf(actual_name, actual_name_size, "%s", name_data); |
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stop = true; |
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} |
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} |
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RegCloseKey(connection_key); |
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} |
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++i; |
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} |
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RegCloseKey(control_net_key); |
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|
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if (!stop) |
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return 1; |
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|
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return 0; |
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} |
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|
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class Win32EthTunDevice: public EthTunDevice { |
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protected: |
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HANDLE mFile; |
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unsigned char mBuf[MAX_PACKET_SIZE]; |
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DWORD mBuflen; |
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OVERLAPPED mOverlapped; |
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|
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//sets the media status of the TAP device (cable connected or not) |
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bool tap_set_status(ULONG status) |
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{ |
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DWORD len = 0; |
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BOOL ret = DeviceIoControl(mFile, TAP_IOCTL_SET_MEDIA_STATUS, |
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&status, sizeof (status), |
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&status, sizeof (status), &len, NULL); |
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if (!ret) { |
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char errmsg[ERRORMSG_SIZE]; |
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getErrorString(errmsg, sizeof errmsg, GetLastError()); |
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printm("Failed: %s\n", errmsg); |
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} |
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return ret; |
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} |
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|
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public: |
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|
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Win32EthTunDevice() |
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{ |
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} |
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|
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virtual ~Win32EthTunDevice() |
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{ |
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if (mFile != INVALID_HANDLE_VALUE) |
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shutdownDevice(); |
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} |
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|
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int initDevice() |
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{ |
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char device_path[256]; |
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char device_guid[0x100]; |
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int rc; |
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HANDLE handle = NULL; |
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|
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printm("Enumerating TAP devices...\n"); |
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rc = get_device_guid(device_guid, sizeof device_guid, NULL, 0); |
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if (rc != 0) { |
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throw MsgException("Could not locate any installed TAP-WIN32 devices."); |
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} |
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|
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//Open Windows TAP-Win32 adapter |
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ht_snprintf(device_path, sizeof device_path, "%s%s%s", |
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USERMODEDEVICEDIR, |
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device_guid, |
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TAPSUFFIX); |
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|
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handle = CreateFile( |
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device_path, |
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GENERIC_READ | GENERIC_WRITE, |
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0, |
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0, |
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OPEN_EXISTING, |
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FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, |
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0); |
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|
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if (handle == INVALID_HANDLE_VALUE || handle == NULL) { |
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throw MsgException("Opening TAP connection failed"); |
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} |
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|
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mFile = handle; |
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mOverlapped.Offset = 0; |
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mOverlapped.OffsetHigh = 0; |
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mOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); |
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|
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//check TAP driver version against our minimum supported version |
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{ |
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ULONG info[3]; |
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ULONG len; |
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info[0] = info[1] = info[2] = 0; |
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if (DeviceIoControl(handle, TAP_IOCTL_GET_VERSION, |
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&info, sizeof (info), |
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&info, sizeof (info), &len, NULL)) { |
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printm("Driver Version %d.%d\n", |
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(int) info[0], |
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(int) info[1]); |
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} else { |
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if (DeviceIoControl(handle, OLD_TAP_IOCTL_GET_VERSION, |
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&info, sizeof (info), |
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&info, sizeof (info), &len, NULL)) { |
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printm("Driver Version %d.%d %s.\n", |
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(int) info[0], |
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(int) info[1], |
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(info[2] ? "(DEBUG) " : "")); |
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|
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} else { |
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char errmsg[ERRORMSG_SIZE]; |
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getErrorString(errmsg, sizeof errmsg, GetLastError()); |
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throw MsgfException("Could not get driver version info: %s\n", errmsg); |
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} |
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} |
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if (!(info[0] > TAP_WIN32_MIN_MAJOR || (info[0] == TAP_WIN32_MIN_MAJOR && info[1] >= TAP_WIN32_MIN_MINOR))) { |
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throw MsgfException("ERROR: This version of PearPC requires a TAP-Win32 driver that is at least version %d.%d\n" |
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"Please install an updated version from http://prdownloads.sourceforge.net/openvpn/openvpn-2.0_beta2-install.exe\n", |
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TAP_WIN32_MIN_MAJOR, |
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TAP_WIN32_MIN_MINOR); |
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} |
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} |
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|
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//connect our virtual cat5 cable to the TAP device |
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if (!tap_set_status(TRUE)) { |
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if (CloseHandle(handle) != 1) { |
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printm("Error closing handle.\n"); |
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} |
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throw MsgfException("Setting Media Status to connected failed (handle is %d)\n", handle); |
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} |
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return 0; |
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} |
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|
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int shutdownDevice() |
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{ |
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printm("Setting Media Status to disconnected.\n"); |
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if (!tap_set_status(false)) { |
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printm("Error disconnecting media.\n"); |
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} |
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printm("Closing TAP-WIN32 handle.\n"); |
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CloseHandle(mFile); |
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mFile = INVALID_HANDLE_VALUE; |
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return 0; |
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} |
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|
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virtual uint recvPacket(void *buf, uint size) |
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{ |
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if (mBuflen > size) { |
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// no partial packets. drop it. |
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mBuflen = 0; |
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return 0; |
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} |
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memcpy(buf, mBuf, mBuflen); |
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uint ret = mBuflen; |
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mBuflen = 0; |
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return ret; |
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} |
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|
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virtual int waitRecvPacket() |
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{ |
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BOOL status; |
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mOverlapped.Offset = 0; |
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mOverlapped.OffsetHigh = 0; |
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ResetEvent(mOverlapped.hEvent); |
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status = ReadFile(mFile, mBuf, sizeof mBuf, &mBuflen, &mOverlapped); |
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if (!status) { |
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DWORD e = GetLastError(); |
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if (e == ERROR_IO_PENDING) { |
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WaitForSingleObject(mOverlapped.hEvent, INFINITE); |
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if (!GetOverlappedResult(mFile, &mOverlapped, &mBuflen, FALSE)) { |
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printm("You should never see this error\n"); |
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} |
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} else { |
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char errmsg[ERRORMSG_SIZE]; |
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getErrorString(errmsg, sizeof errmsg, e); |
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printm("Bad read error: %s\n", errmsg); |
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|
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return EIO; |
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} |
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} |
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return 0; |
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} |
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|
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virtual uint sendPacket(void *buf, uint size) |
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{ |
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DWORD written; |
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BOOL ret; |
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OVERLAPPED wrov = {0}; |
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ret = WriteFile(mFile, buf, size, &written, &wrov); |
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if (!ret) { |
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char errmsg[ERRORMSG_SIZE]; |
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getErrorString(errmsg, sizeof errmsg, GetLastError()); |
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printm("Sending of %d bytes failed (%d bytes sent): %s\n", size, written, errmsg); |
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} |
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return written; |
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} |
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|
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virtual uint getWriteFramePrefix() |
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{ |
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return 0; |
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} |
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|
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}; // end of Win32EthTunDevice |
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|
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EthTunDevice *createEthernetTunnel() |
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{ |
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return new Win32EthTunDevice(); |
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} |
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