private async void doWork()
{
while (await taskChannel.Reader.WaitToReadAsync())
{
taskChannel.Reader.TryRead(out var act);
try
{
#if YTLOG_VERBOSE
var sw = Stopwatch.StartNew();
#endif
act();
#if YTLOG_VERBOSE
//Debug.WriteLine($"{dispatchWorks.Count} tasks remain {sw.ElapsedMilliseconds}");
#endif
}
catch (Exception e)
{
DebugLogger.Log("Error from task queue: " + e.ToString());
var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings.Values;
if (localSettings.TryGetValue("lastError", out var lastErr) && lastErr is string lastErrStr)
{
lastErrStr += "\r\n" + e.ToString();
}
else
{
lastErrStr = e.ToString();
}
localSettings["lastError"] = lastErrStr;
}
}
}
public void Encapsulate(VpnChannel channel, VpnPacketBufferList packets, VpnPacketBufferList encapulatedPackets)
{
try
{
uint packetCount = packets.Size;
var tun = context.tun;
if (tun == null)
{
return;
}
while (packetCount-- > 0)
{
#if YTLOG_VERBOSE
LogLine("Encapsulating " + packets.Size.ToString(), channel);
#endif
var packet = packets.RemoveAtBegin();
tun.PushPacket(packet.Buffer.ToArray());
packets.Append(packet);
}
}
catch (Exception ex)
{
DebugLogger.Log("Error encapsulating packets: " + ex.ToString());
}
}
public async void Deinit()
{
if (!running)
{
return;
}
running = false;
DebugLogger.Log("Tun deinit req");
wintun.PacketPoped -= W_PopPacket;
TcpSocket.EstablishedTcp -= W_EstablishTcp;
foreach (var weakAdapter in tunAdapters.Where(w => w.TryGetTarget(out var a) /* TODO: && a.IsShutdown != 0 */))
{
try
{
weakAdapter.TryGetTarget(out var adapter);
adapter.Reset();
}
catch (Exception) { }
}
TunDatagramAdapter.socketMap.Clear();
await Task.Delay(300).ConfigureAwait(false);
wintun.Deinit();
tunAdapters.Clear();
// To avoid problems after reconnecting
// dnsServer.Clear();
// dispatchWorker = null;
taskChannel.Writer.TryComplete();
// debugSocket?.Dispose();
// debugSocket = null;
DebugLogger.initNeeded = null;
}
public void Run(IBackgroundTaskInstance taskInstance)
{
var initDebugSocketNeeded = DebugLogger.InitNeeded();
if (initDebugSocketNeeded)
{
try
{
var _ = DebugLogger.InitDebugSocket();
}
catch (Exception) { }
}
VpnChannel.ProcessEventAsync(Plugin, taskInstance.TriggerDetails);
DebugLogger.Log("VPN Background task finished");
}
private async void StartRecv()
{
while (u != null)
{
try
{
var recv = await u.ReceiveAsync().ConfigureAwait(false);
tun?.PushPacket(recv.Buffer);
}
catch (ObjectDisposedException) { }
catch (Exception ex)
{
DebugLogger.Log("Error receiving from packet processor: " + ex.ToString());
}
}
}
private void Tun_PacketPoped(object sender, byte[] e)
{
try
{
// await s?.OutputStream.WriteAsync(e.AsBuffer());
// await (u?.SendAsync(e, e.Length, pluginEndpoint) ?? Task.CompletedTask).ConfigureAwait(false);
_ = outPackets.Writer.TryWrite(e);
_ = u.SendAsync(DUMMY_DATA, DUMMY_DATA.Length, pluginEndpoint);
}
catch (Exception ex)
{
DebugLogger.Log("Error popping a packet: " + ex.ToString());
}
finally
{
// packetPopLock.Release();
}
}
public async void Init()
{
if (running)
{
return;
}
adapterFactory = await AdapterConfig.GetAdapterFactoryFromDefaultFile();
running = true;
taskChannel = Channel.CreateUnbounded <Action>(new UnboundedChannelOptions()
{
SingleReader = true
});
var _ = Task.Run(() => doWork());
wintun.PacketPoped += W_PopPacket;
TcpSocket.EstablishedTcp += W_EstablishTcp;
wintun.Init();
int i = 0;
while (running)
{
i++;
await executeLwipTask(() =>
{
wintun.CheckTimeout();
return(0);
}).ConfigureAwait(false);
if (i % 10 == 0)
{
tunAdapters.RemoveAll(w => !w.TryGetTarget(out var a) /* TODO: || a.IsShutdown == 1 */);
if (DebugLogger.LogNeeded())
{
DebugLogger.Log("# of connections in local stack: " + ConnectionCount);
DebugLogger.Log($"# of open/all adapters: {TunSocketAdapter.OpenCount} {tunAdapters.Count}");
DebugLogger.Log($"# of recv/send: {TunSocketAdapter.RecvingCount} {TunSocketAdapter.SendingCount}");
}
}
await Task.Delay(250).ConfigureAwait(false);
}
}
public void PushPacket([ReadOnlyArray] byte[] packet)
{
// Packets must contain valid IPv4 headers
if (packet.Length < 20 || packet[0] >> 4 != 4)
{
return;
}
var proto = packet[9];
switch (proto)
{
case 6: // TCP
break;
case 17: // UDP
break;
default:
return;
}
if (DebugLogger.LogNeeded())
{
var _ = DebugLogger.LogPacketWithTimestamp(packet);
}
if (proto == 6)
{
_ = executeLwipTask(() => wintun.PushPacket(packet));
}
else
{
try
{
TunDatagramAdapter.ProcessIpPayload(packet, this);
}
catch (Exception ex)
{
DebugLogger.Log("Error processing udp ip packet: " + ex.ToString());
}
}
}
public void Disconnect(VpnChannel channel)
{
try
{
State = VpnPluginState.Disconnecting;
DebugLogger.Log("Stopping channel");
channel.Stop();
DebugLogger.Log("Stopping context");
context.Stop();
DebugLogger.Log("Context stopped");
}
catch (Exception ex)
{
DebugLogger.Log("Error disconnecting: " + ex.ToString());
}
finally
{
State = VpnPluginState.Disconnected;
var _ = DebugLogger.ResetLoggers();
DebugLogger.initNeeded = null;
}
}
public void Decapsulate(VpnChannel channel, VpnPacketBuffer encapPacketBuffer, VpnPacketBufferList decapsulatedPackets, VpnPacketBufferList controlPacketsToSend)
{
try
{
var reader = context.outPackets?.Reader;
if (reader == null)
{
return;
}
while (reader.TryRead(out var bytes))
{
var encapBuffer = channel.GetVpnReceivePacketBuffer();
var encapBuf = encapBuffer.Buffer;
bytes.CopyTo(encapBuf);
encapBuf.Length = (uint)bytes.Length;
decapsulatedPackets.Append(encapBuffer);
}
}
catch (Exception ex)
{
DebugLogger.Log("Error decapsulating packets: " + ex.ToString());
}
}
public void Connect(VpnChannel channel)
{
State = VpnPluginState.Connecting;
DebugLogger.Logger = s =>
{
channel.LogDiagnosticMessage(s);
};
DebugLogger.Log("Starting connection to VPN tunnel");
try
{
var transport = new DatagramSocket();
channel.AssociateTransport(transport, null);
DebugLogger.Log("Initializing context");
#if !YT_MOCK
var configPath = AdapterConfig.GetDefaultConfigFilePath();
if (string.IsNullOrEmpty(configPath))
{
channel.TerminateConnection("Default server configuration not set. Please launch YtFlow app and select a server configuration as default.");
return;
}
try
{
var config = AdapterConfig.GetConfigFromFilePath(configPath);
if (config == null)
{
channel.TerminateConnection("Could not read server configuration.");
return;
}
}
catch (Exception ex)
{
channel.TerminateConnection("Error reading server configuration: " + ex.ToString());
return;
}
#endif
DebugLogger.Log("Config read, binding endpoint");
if (!transport.BindEndpointAsync(new HostName("127.0.0.1"), string.Empty).AsTask().ContinueWith(t =>
{
if (t.IsFaulted || t.IsCanceled)
{
DebugLogger.Log("Error binding endpoint: " + t.Exception.ToString());
return(false);
}
else
{
DebugLogger.Log("Binded");
return(true);
}
}).Result)
{
return;
}
DebugLogger.Log("Endpoint binded, init context");
var rport = context.Init(int.Parse(transport.Information.LocalPort)).ToString();
DebugLogger.Log("Context initialized");
/* var rport = context.Init(transport.Information.LocalPort, str =>
* {
* LogLine(str, channel);
* return null;
* }); */
DebugLogger.Log("Connecting to local packet processor");
if (!transport.ConnectAsync(new HostName("127.0.0.1"), rport).AsTask().ContinueWith(t =>
{
if (t.IsFaulted || t.IsCanceled)
{
channel.TerminateConnection("Error connecting to local packet processor: " + t.Exception.ToString());
DebugLogger.Log("Local packet processor connected");
return(false);
}
else
{
return(true);
}
}).Result)
{
return;
}
DebugLogger.Log("Connected to local packet processor");
VpnRouteAssignment routeScope = new VpnRouteAssignment()
{
ExcludeLocalSubnets = true
};
var inclusionRoutes = routeScope.Ipv4InclusionRoutes;
// DNS server
inclusionRoutes.Add(new VpnRoute(new HostName("1.1.1.1"), 32));
// main CIDR
inclusionRoutes.Add(new VpnRoute(new HostName("11.17.0.0"), 16));
// proxy
inclusionRoutes.Add(new VpnRoute(new HostName("172.17.255.0"), 24));
var assignment = new VpnDomainNameAssignment();
assignment.DomainNameList.Add(new VpnDomainNameInfo(
".",
VpnDomainNameType.Suffix,
new[] { new HostName("1.1.1.1") },
Array.Empty <HostName>()));
var now = DateTime.Now;
DebugLogger.Log("Starting transport");
channel.StartWithMainTransport(
new[] { new HostName("192.168.3.1") },
null,
null,
routeScope,
assignment,
1500u,
1512u,
false,
transport
);
var delta = DateTime.Now - now;
_ = context.u.SendAsync(new byte[] { 0 }, 1, context.pluginEndpoint);
DebugLogger.Log($"Transport started in {delta.TotalMilliseconds} ms.");
State = VpnPluginState.Connected;
}
catch (Exception ex)
{
var msg = "Error connecting to VPN tunnel: " + ex.ToString();
channel.TerminateConnection(msg);
DebugLogger.Log(msg);
State = VpnPluginState.Disconnected;
}
}
