/*
device.c -- Interaction with Windows tap driver in a MinGW environment
Copyright (C) 2002-2005 Ivo Timmermans,
- 2002-2009 Guus Sliepen <guus@tinc-vpn.org>
+ 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
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"
+#include "../conf.h"
+#include "../device.h"
+#include "../logger.h"
+#include "../net.h"
+#include "../route.h"
+#include "../utils.h"
+#include "../xalloc.h"
-#include "mingw/common.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 const char *device_info = "Windows tap device";
-static int device_total_in = 0;
-static int device_total_out = 0;
+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;
- long len;
- OVERLAPPED overlapped;
+ DWORD len;
vpn_packet_t packet;
+ int errors = 0;
logger(LOG_DEBUG, "Tap reader running");
/* Read from tap device and send to parent */
- overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+ r_overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
for(;;) {
- overlapped.Offset = 0;
- overlapped.OffsetHigh = 0;
- ResetEvent(overlapped.hEvent);
+ ResetEvent(r_overlapped.hEvent);
- status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
+ status = ReadFile(device_handle, packet.data, MTU, &len, &r_overlapped);
if(!status) {
if(GetLastError() == ERROR_IO_PENDING) {
- WaitForSingleObject(overlapped.hEvent, INFINITE);
- if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
+ 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));
- return -1;
+ device, strerror(errno));
+ errors++;
+
+ if(errors >= 10) {
+ EnterCriticalSection(&mutex);
+ running = false;
+ LeaveCriticalSection(&mutex);
+ }
+
+ usleep(1000000);
+ continue;
}
}
- EnterCriticalSection(&mutex);
+ errors = 0;
packet.len = len;
packet.priority = 0;
+
+ EnterCriticalSection(&mutex);
route(myself, &packet);
LeaveCriticalSection(&mutex);
}
+
+ return 0;
}
-bool setup_device(void) {
+static bool setup_device(void) {
HKEY key, key2;
int i;
char adapterid[1024];
char adaptername[1024];
char tapname[1024];
- long len;
+ DWORD len;
unsigned long status;
bool found = false;
- int sock, err;
+ int 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);
+ 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)) {
return false;
}
- for (i = 0; ; i++) {
+ for(i = 0; ; i++) {
len = sizeof(adapterid);
- if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
+
+ 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))
+ if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) {
continue;
+ }
len = sizeof(adaptername);
- err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
+ err = RegQueryValueEx(key2, "Name", 0, 0, (LPBYTE)adaptername, &len);
RegCloseKey(key2);
- if(err)
+ if(err) {
continue;
+ }
if(device) {
if(!strcmp(device, adapterid)) {
found = true;
break;
- } else
+ } else {
continue;
+ }
}
if(iface) {
if(!strcmp(iface, adaptername)) {
found = true;
break;
- } else
+ } 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;
return false;
}
- if(!device)
+ if(!device) {
device = xstrdup(adapterid);
+ }
- if(!iface)
+ if(!iface) {
iface = xstrdup(adaptername);
+ }
/* Try to open the corresponding tap device */
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;
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);
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) {
+static void close_device(void) {
CloseHandle(device_handle);
free(device);
free(iface);
}
-bool read_packet(vpn_packet_t *packet) {
+static bool read_packet(vpn_packet_t *packet) {
return false;
}
-bool write_packet(vpn_packet_t *packet) {
- long lenout;
- OVERLAPPED overlapped = {0};
+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);
+ 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;
+ /* 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) {
+static void dump_device_stats(void) {
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);
+ 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