/*
- device.c -- Interaction with CIPE driver in a MinGW environment
- Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2002-2003 Guus Sliepen <guus@sliepen.eu.org>
+ device.c -- Interaction with Windows tap driver in a MinGW environment
+ Copyright (C) 2002-2005 Ivo Timmermans,
+ 2002-2014 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
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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: device.c,v 1.1.2.3 2003/07/28 21:54:03 guus Exp $
+ 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 "../system.h"
#include <windows.h>
#include <winioctl.h>
-#include "conf.h"
-#include "logger.h"
-#include "net.h"
-#include "route.h"
-#include "utils.h"
-#include "xalloc.h"
-
-#define NETCARD_REG_KEY_2000 "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
-#define NETCARD_REG_KEY "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards"
-#define REG_SERVICE_KEY "SYSTEM\\CurrentControlSet\\Services"
-#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
-
-#define USERMODEDEVICEDIR "\\\\.\\"
-#define SYSDEVICEDIR "\\Device\\"
-#define USERDEVICEDIR "\\??\\"
-#define TAPSUFFIX ".tap"
-
-#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
+#include "../conf.h"
+#include "../device.h"
+#include "../logger.h"
+#include "../net.h"
+#include "../route.h"
+#include "../utils.h"
+#include "../xalloc.h"
-#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
-#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
-#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
+#include "common.h"
-/* FIXME: This only works for Windows 2000 */
-#define OSTYPE 5
-
-HANDLE device_fd = INVALID_HANDLE_VALUE;
+int device_fd = -1;
+static HANDLE device_handle = INVALID_HANDLE_VALUE;
char *device = NULL;
char *iface = NULL;
-char *device_info = 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;
+ }
+ }
-int device_total_in = 0;
-int device_total_out = 0;
+ errors = 0;
+ packet.len = len;
+ packet.priority = 0;
-bool setup_device(void)
-{
+ EnterCriticalSection(&mutex);
+ route(myself, &packet);
+ LeaveCriticalSection(&mutex);
+ }
+
+ return 0;
+}
+
+static bool setup_device(void) {
HKEY key, key2;
int i;
char adapterid[1024];
char adaptername[1024];
char tapname[1024];
- char gelukt = 0;
- long len;
+ DWORD len;
+ unsigned long status;
bool found = false;
- cp();
+ int err;
+ HANDLE thread;
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, REG_CONTROL_NET, 0, KEY_READ, &key)) {
- logger(LOG_ERR, _("Unable to read registry"));
+ if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
+ logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError()));
return false;
}
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;
continue;
}
- /* Find out more about this adapter */
-
- snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
-
- if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) {
- logger(LOG_ERR, _("Unable to read registry"));
- return false;
- }
-
- len = sizeof(adaptername);
- RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
-
if(iface) {
if(!strcmp(iface, adaptername)) {
found = true;
}
snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
- device_fd = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
- if(device_fd != INVALID_HANDLE_VALUE) {
+ 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!"));
+ logger(LOG_ERR, "No Windows tap device found!");
return false;
}
- device = adapterid;
- iface = adaptername;
+ if(!device)
+ device = xstrdup(adapterid);
+
+ if(!iface)
+ iface = xstrdup(adaptername);
/* Try to open the corresponding tap device */
- if(device_fd == INVALID_HANDLE_VALUE) {
+ if(device_handle == INVALID_HANDLE_VALUE) {
snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
- device_fd = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+ device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
}
- if(device_fd == INVALID_HANDLE_VALUE) {
- logger(LOG_ERR, _("%s (%s) is no a usable Windows tap device!"), device, iface);
+ 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_fd, 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!"));
+ 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;
}
overwrite_mac = 1;
}
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- iface = device;
+ /* Create overlapped events for tap I/O */
- device_info = _("Windows tap device");
+ r_overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+ w_overlapped.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL);
- logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
+ /* Start the tap reader */
- return true;
-}
+ thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
-void close_device(void)
-{
- cp();
+ if(!thread) {
+ logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
+ return false;
+ }
- CloseHandle(device_fd);
-}
+ /* Set media status for newer TAP-Win32 devices */
-bool read_packet(vpn_packet_t *packet)
-{
- int lenin;
+ status = true;
+ DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
- cp();
+ device_info = "Windows tap device";
- if(!ReadFile(device_fd, packet->data, MTU, &lenin, NULL)) {
- logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
- device, strerror(errno));
- return false;
- }
-
- packet->len = lenin;
+ logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
- device_total_in += packet->len;
+ return true;
+}
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
- device_info);
+static void close_device(void) {
+ CloseHandle(device_handle);
- return true;
+ free(device);
+ free(iface);
}
-bool write_packet(vpn_packet_t *packet)
-{
- int lenout;
+static bool read_packet(vpn_packet_t *packet) {
+ return false;
+}
- cp();
+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"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
packet->len, device_info);
- if(!WriteFile(device_fd, packet->data, packet->len, &lenout, NULL)) {
- logger(LOG_ERR, "Error while writing to %s %s", device_info, device);
- return false;
+ /* 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;
}
-void dump_device_stats(void)
-{
- cp();
-
- logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
- logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
- logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+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,
+};
projects / tinc / blobdiff