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- /*
- device.c -- Interaction with Windows tap driver in a MinGW environment
- Copyright (C) 2002-2005 Ivo Timmermans,
- 2002-2016 Guus Sliepen <guus@tinc-vpn.org>
- 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 <windows.h>
- #include <winioctl.h>
- #include "../conf.h"
- #include "../device.h"
- #include "../logger.h"
- #include "../net.h"
- #include "../route.h"
- #include "../utils.h"
- #include "../xalloc.h"
- #include "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;
- OVERLAPPED r_overlapped;
- OVERLAPPED w_overlapped;
- static DWORD WINAPI tapreader(void *bla) {
- int status;
- DWORD len;
- vpn_packet_t packet;
- int errors = 0;
- logger(LOG_DEBUG, "Tap reader running");
- /* Read from tap device and send to parent */
- r_overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
- for(;;) {
- ResetEvent(r_overlapped.hEvent);
- status = ReadFile(device_handle, packet.data, MTU, &len, &r_overlapped);
- if(!status) {
- if(GetLastError() == ERROR_IO_PENDING) {
- WaitForSingleObject(r_overlapped.hEvent, INFINITE);
- if(!GetOverlappedResult(device_handle, &r_overlapped, &len, FALSE)) {
- continue;
- }
- } else {
- logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- errors++;
- if(errors >= 10) {
- EnterCriticalSection(&mutex);
- running = false;
- LeaveCriticalSection(&mutex);
- }
- usleep(1000000);
- continue;
- }
- }
- errors = 0;
- packet.len = len;
- packet.priority = 0;
- EnterCriticalSection(&mutex);
- route(myself, &packet);
- LeaveCriticalSection(&mutex);
- }
- return 0;
- }
- static bool setup_device(void) {
- HKEY key, key2;
- int i;
- char regpath[1024];
- char adapterid[1024];
- char adaptername[1024];
- char tapname[1024];
- DWORD len;
- unsigned long status;
- bool found = false;
- int err;
- HANDLE thread;
- get_config_string(lookup_config(config_tree, "Device"), &device);
- get_config_string(lookup_config(config_tree, "Interface"), &iface);
- if(device && iface) {
- logger(LOG_WARNING, "Warning: both Device and Interface specified, results may not be as expected");
- }
- /* 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, (LPBYTE)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;
- }
- /* Create overlapped events for tap I/O */
- r_overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
- w_overlapped.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL);
- /* 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;
- }
- static void close_device(void) {
- CloseHandle(device_handle);
- free(device);
- free(iface);
- }
- static bool read_packet(vpn_packet_t *packet) {
- return false;
- }
- static bool write_packet(vpn_packet_t *packet) {
- DWORD lenout;
- static vpn_packet_t queue;
- ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
- packet->len, device_info);
- /* Check if there is something in progress */
- if(queue.len) {
- DWORD size;
- BOOL success = GetOverlappedResult(device_handle, &w_overlapped, &size, FALSE);
- if(success) {
- ResetEvent(&w_overlapped);
- queue.len = 0;
- } else {
- int err = GetLastError();
- if(err != ERROR_IO_INCOMPLETE) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error completing previously queued write: %s", winerror(err));
- ResetEvent(&w_overlapped);
- queue.len = 0;
- } else {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, "Previous overlapped write still in progress");
- // drop this packet
- return true;
- }
- }
- }
- /* Otherwise, try to write. */
- memcpy(queue.data, packet->data, packet->len);
- if(!WriteFile(device_handle, queue.data, packet->len, &lenout, &w_overlapped)) {
- int err = GetLastError();
- if(err != ERROR_IO_PENDING) {
- logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(err));
- return false;
- }
- // Write is being done asynchronously.
- queue.len = packet->len;
- } else {
- // Write was completed immediately.
- ResetEvent(&w_overlapped);
- }
- device_total_out += packet->len;
- return true;
- }
- static 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);
- }
- const devops_t os_devops = {
- .setup = setup_device,
- .close = close_device,
- .read = read_packet,
- .write = write_packet,
- .dump_stats = dump_device_stats,
- };
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