int device_fd = -1;
static HANDLE device_handle = INVALID_HANDLE_VALUE;
+static io_t device_read_io;
+static OVERLAPPED device_read_overlapped;
+static vpn_packet_t device_read_packet;
char *device = NULL;
char *iface = NULL;
static char *device_info = NULL;
extern char *myport;
-static DWORD WINAPI tapreader(void *bla) {
- int status;
- DWORD len;
- OVERLAPPED overlapped;
- vpn_packet_t packet;
-
- logger(DEBUG_ALWAYS, LOG_DEBUG, "Tap reader running");
-
- /* Read from tap device and send to parent */
+static void device_issue_read() {
+ device_read_overlapped.Offset = 0;
+ device_read_overlapped.OffsetHigh = 0;
- overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+ int status = ReadFile(device_handle, (void *)device_read_packet.data, MTU, NULL, &device_read_overlapped);
- for(;;) {
- overlapped.Offset = 0;
- overlapped.OffsetHigh = 0;
- ResetEvent(overlapped.hEvent);
-
- status = ReadFile(device_handle, (void *)packet.data, MTU, &len, &overlapped);
+ if(!status && GetLastError() != ERROR_IO_PENDING) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
+ device, strerror(errno));
+ }
+}
- if(!status) {
- if(GetLastError() == ERROR_IO_PENDING) {
- WaitForSingleObject(overlapped.hEvent, INFINITE);
- if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
- continue;
- } else {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return -1;
- }
- }
+static void device_handle_read(void *data) {
+ ResetEvent(device_read_overlapped.hEvent);
- EnterCriticalSection(&mutex);
- packet.len = len;
- packet.priority = 0;
- route(myself, &packet);
- event_flush_output();
- LeaveCriticalSection(&mutex);
+ DWORD len;
+ if (!GetOverlappedResult(device_handle, &device_read_overlapped, &len, FALSE)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error getting read result from %s %s: %s", device_info,
+ device, strerror(errno));
+ return;
}
+
+ device_read_packet.len = len;
+ device_read_packet.priority = 0;
+ route(myself, &device_read_packet);
+ device_issue_read();
}
static bool setup_device(void) {
char adaptername[1024];
char tapname[1024];
DWORD len;
- unsigned long status;
bool found = false;
/* Start the tap reader */
- thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
-
- if(!thread) {
- logger(DEBUG_ALWAYS, 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);
+ io_add_event(&device_read_io, device_handle_read, NULL, CreateEvent(NULL, TRUE, FALSE, NULL));
+ device_read_overlapped.hEvent = device_read_io.event;
+ device_issue_read();
device_info = "Windows tap device";
return true;
}
-static void close_device(void) {
- CloseHandle(device_handle);
+static void enable_device(void) {
+ logger(DEBUG_ALWAYS, LOG_INFO, "Enabling %s", device_info);
+ ULONG status = 1;
+ DWORD len;
+ DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
+}
+
+static void disable_device(void) {
+ logger(DEBUG_ALWAYS, LOG_INFO, "Disabling %s", device_info);
+ ULONG status = 0;
+ DWORD len;
+ DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof status, &status, sizeof status, &len, NULL);
+}
- free(device);
- free(iface);
+static void close_device(void) {
+ io_del(&device_read_io);
+ CancelIo(device_handle);
+ CloseHandle(device_read_overlapped.hEvent);
+ CloseHandle(device_handle); device_handle = INVALID_HANDLE_VALUE;
+
+ free(device); device = NULL;
+ free(iface); iface = NULL;
+ device_info = NULL;
}
static bool read_packet(vpn_packet_t *packet) {
.close = close_device,
.read = read_packet,
.write = write_packet,
+ .enable = enable_device,
+ .disable = disable_device,
};