private async Task HandleAsync(Socket socket, CancellationToken token)
{
try
{
IDuplexPipe pipe = socket.AsDuplexPipe();
ReadResult result = await pipe.Input.ReadAsync(token);
ReadOnlySequence <byte> buffer = result.Buffer;
if (IsSocks5Header(buffer))
{
using TcpClient socks5 = new();
await socks5.ConnectAsync(_socks5CreateOption.Address !, _socks5CreateOption.Port, token);
IDuplexPipe socks5Pipe = socks5.Client.AsDuplexPipe();
await socks5Pipe.Output.WriteAsync(buffer, token);
pipe.Input.AdvanceTo(buffer.End);
await socks5Pipe.LinkToAsync(pipe, token);
}
else
{
pipe.Input.AdvanceTo(buffer.Start, buffer.End);
pipe.Input.CancelPendingRead();
await _httpToSocks5.ForwardToSocks5Async(pipe, _socks5CreateOption, token);
}
}
finally
{
socket.FullClose();
}
private async Task HandleAsync(Socket socket, CancellationToken token)
{
EndPoint?remoteEndPoint = socket.RemoteEndPoint;
try
{
IDuplexPipe pipe = socket.AsDuplexPipe(DefaultSocketPipeReaderOptions, DefaultSocketPipeWriterOptions);
ReadResult result = await pipe.Input.ReadAsync(token);
ReadOnlySequence <byte> buffer = result.Buffer;
ILocalTcpService?service = _services.FirstOrDefault(tcpService => tcpService.IsHandle(buffer));
if (service is null)
{
throw new InvalidDataException(@"Cannot handle incoming pipe.");
}
pipe.Input.AdvanceTo(buffer.Start, buffer.End);
pipe.Input.CancelPendingRead();
// In every service.HandleAsync, first ReadResult.IsCanceled always true
await service.HandleAsync(pipe, token);
}
catch (ObjectDisposedException)
{
}
catch (IOException ex) when(ex.InnerException is SocketException)
{
}
catch (OperationCanceledException)
{
}
catch (Exception ex)
{
_logger.LogError(ex, @"Handle Error");
}
finally
{
socket.FullClose();
_logger.LogInformation(@"{Remote} disconnected", remoteEndPoint);
}
}
private async ValueTask HandleAsync(Socket socket, CancellationToken token)
{
try
{
IDuplexPipe pipe = socket.AsDuplexPipe();
Socks5ServerConnection service = new(pipe, _credential);
await service.AcceptClientAsync(token);
switch (service.Command)
{
case Command.Connect:
{
using TcpClient tcp = new();
if (service.Target.Type is AddressType.Domain)
{
Assumes.NotNull(service.Target.Domain);
await tcp.ConnectAsync(service.Target.Domain, service.Target.Port, token);
}
else
{
Assumes.NotNull(service.Target.Address);
await tcp.ConnectAsync(service.Target.Address, service.Target.Port, token);
}
await service.SendReplyAsync(Socks5Reply.Succeeded, ReplyTcpBound, token);
IDuplexPipe tcpPipe = tcp.Client.AsDuplexPipe();
await tcpPipe.LinkToAsync(pipe, token);
break;
}
case Command.Bind:
{
await service.SendReplyAsync(Socks5Reply.CommandNotSupported, ReplyTcpBound, token);
break;
}
case Command.UdpAssociate:
{
IPEndPoint remote = (IPEndPoint)socket.RemoteEndPoint !;
IPEndPoint local = new(((IPEndPoint)TcpListener.LocalEndpoint).Address, IPEndPoint.MinPort);
using SimpleSocks5UdpServer udpServer = new(local, remote);
udpServer.StartAsync().Forget();
ServerBound replyUdpBound = new()
{
Type = AddressType.IPv4,
Address = local.Address,
Domain = default,
Port = (ushort)((IPEndPoint)udpServer.UdpListener.Client.LocalEndPoint !).Port,
};
await service.SendReplyAsync(Socks5Reply.Succeeded, replyUdpBound, token);
// wait remote close
ReadResult result = await pipe.Input.ReadAsync(token);
Report.IfNot(result.IsCompleted);
break;
}