private static async Task CheckPortTcp(IPAddress ipAddr, int port, int timeout = 2000)
{
using (var tcpClient = new TcpClient())
{
var connectTask = await tcpClient.ConnectAsync(ipAddr, port, timeout);
PortStatus portStatus;
switch (connectTask.Status)
{
case TaskStatus.RanToCompletion:
portStatus = PortStatus.OPEN;
break;
case TaskStatus.Faulted:
portStatus = PortStatus.CLOSED;
break;
default:
portStatus = PortStatus.FILTERED;
break;
}
ProtocolType?protocolType = null;
if (portStatus == PortStatus.OPEN)
{
var data = new byte[256];
using (var stream = tcpClient.GetStream())
{
stream.ReadTimeout = timeout;
stream.WriteTimeout = timeout;
var writeTask = stream.WriteAsync(PacketToSend, 0, PacketToSend.Length);
var readTask = stream.ReadAsync(data, 0, data.Length);
try
{
await writeTask;
}
catch (Exception e)
{
//Console.WriteLine(e.Message);
}
if (writeTask.Status == TaskStatus.RanToCompletion)
{
try
{
await readTask;
}
catch (Exception e)
{
//Console.WriteLine(e.Message);
}
if (readTask.Status == TaskStatus.RanToCompletion)
{
var length = readTask.Result;
data = data.Take(length).ToArray();
protocolType = ProtocolCheckingUtils.DetectProtocol(data);
}
}
}
Console.WriteLine($"TCP {port} {protocolType}");
}
}
}
private static async Task CheckPortUdp(IPAddress ipAddr, int port, int timeout = 2000)
{
using (var udpClient = new UdpClient())
{
var connectTask = udpClient.Client.ConnectAsync(ipAddr, port);
PortStatus portStatus;
ProtocolType?protocolType = null;
await Task.WhenAny(Task.Delay(timeout), connectTask);
if (connectTask.IsCompleted &&
connectTask.Exception != null && connectTask.Exception.InnerExceptions
.Where(x => x is SocketException)
.Any(x => ((SocketException)x).ErrorCode == 10054)) //WSAECONNRESET
{
portStatus = PortStatus.CLOSED;
}
else
{
portStatus = PortStatus.OPEN;
}
if (portStatus == PortStatus.OPEN)
{
var writeTask = udpClient.SendAsync(PacketToSend, PacketToSend.Length);
var readTask = udpClient.ReceiveAsync();
try
{
await Task.WhenAny(writeTask, Task.Delay(timeout));
}
catch (Exception e)
{
//Console.WriteLine(e);
}
if (writeTask.Status == TaskStatus.RanToCompletion)
{
try
{
await Task.WhenAny(readTask, Task.Delay(timeout));
}
catch (Exception e)
{
//Console.WriteLine(e);
}
if (readTask.Status == TaskStatus.RanToCompletion)
{
protocolType = ProtocolCheckingUtils.DetectProtocol(readTask.Result.Buffer);
}
else
{
return;
}
}
else
{
return;
}
Console.WriteLine($"UDP {port} {protocolType}");
}
}
}
