This is the fourteenth part of the Availability Anywhere series. For your convenience you can find other parts in the table of contents in Part 1 – Connecting to SSH tunnel automatically in Windows
We built a very nice TCP over file System solution. Let’s now implement something similar, based on named pipes. Here comes the code:
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using System; using System.Collections.Generic; using System.IO.Pipes; using System.Linq; using System.Net; using System.Net.Sockets; using System.Threading; namespace PipeProxy { class Program { static void Main(string[] args) { if (args.Length < 2) { Exit(Usage()); } if (args[0] == "client") { Client.Start(args); } else if (args[0] == "pipe_server") { PipeServer.Start(args); } else { Exit(Usage()); } } private static string Usage() { return "PipeProxy.exe client local_port pipe_name\nPipeProxy.exe pipe_server destination_ip:destination_port pipe_name\nPipeProxy.exe port_server destination_ip:destination_port por_name"; } private static void Exit(string message) { Console.WriteLine(message); Environment.Exit(0); } } public class Client { private static Random random = new Random(); public static void Start(string[] args) { var localPort = int.Parse(args[1]); var pipeName = args[2]; Console.WriteLine($"Routing from {localPort} via {pipeName}"); IPEndPoint localEndPoint = new IPEndPoint(0, localPort); Socket listener = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp); listener.Bind(localEndPoint); listener.Listen(100); var totalSent = new Dictionary<string, long>(); var totalReceived = new Dictionary<string, long>(); var totalExceptions = new Dictionary<string, long>(); var localDnss = new[] {"localhost"}; foreach (var localDns in localDnss) { totalSent[localDns] = 0; totalReceived[localDns] = 0; totalExceptions[localDns] = 0; } new Thread(() => { while (true) { Console.Write(DateTime.Now); Console.Write(" E/S/R:\t"); Console.WriteLine(string.Join("\t", localDnss.Select(dns => $"{dns}: {totalExceptions[dns]}/{totalSent[dns]}/{totalReceived[dns]}"))); Thread.Sleep(3000); } }).Start(); while (true) { try { while (true) { Socket socket = listener.Accept(); Console.WriteLine("New connection accepted to be scattered"); new Thread(() => Start(socket, localDnss, pipeName, random.Next(), totalSent, totalReceived, totalExceptions)).Start(); } } catch (Exception e) { Console.WriteLine("Exception " + e); } } } private static void Start(Socket clientSocket, string[] localDnss, string pipeName, int identifier, Dictionary<string, long> sent, Dictionary<string, long> received, Dictionary<string, long> exceptions) { try { Console.WriteLine("Connecting"); var pipeClient = new NamedPipeClientStream(".", pipeName, PipeDirection.InOut, PipeOptions.Asynchronous); pipeClient.Connect(); Console.WriteLine("Connected"); var fileSocket = new PipeSocket(clientSocket, pipeClient, r => received[localDnss[0]]+= r, s => sent[localDnss[0]]+=s); fileSocket.Start(); } catch (Exception e) { Console.WriteLine("Exception " + e); } } } class PipeServer { public static void Start(string[] args) { var destinationIp = args[1].Split(':')[0]; var destinationPort = int.Parse(args[1].Split(':')[1]); var pipeName = args[2]; Console.WriteLine($"Routing to {destinationIp}:{destinationPort} via {pipeName}"); NamedPipeServerStream pipeServer = new NamedPipeServerStream(pipeName, PipeDirection.InOut, NamedPipeServerStream.MaxAllowedServerInstances, PipeTransmissionMode.Byte, PipeOptions.Asynchronous); while (true) { try { while (true) { Thread.Sleep(1000); pipeServer.WaitForConnection(); // I'm forcing IPv4 (IPv6 breaks with Cisco AnyConnect) IPEndPoint remoteEP = new IPEndPoint(Dns.GetHostEntry(destinationIp).AddressList.First(a => a.AddressFamily == AddressFamily.InterNetwork), destinationPort); Socket senderSocket = new Socket(remoteEP.AddressFamily, SocketType.Stream, ProtocolType.Tcp); senderSocket.Connect(remoteEP); Console.WriteLine("Socket connected to {0}", senderSocket.RemoteEndPoint); new Thread(() => { var socket = new PipeSocket(senderSocket, pipeServer, r => { }, s => { }); socket.Start(); }).Start(); } } catch (Exception e) { Console.WriteLine("Exception " + e); if (e.Message.Contains("being closed")) { pipeServer = new NamedPipeServerStream(pipeName, PipeDirection.InOut, NamedPipeServerStream.MaxAllowedServerInstances, PipeTransmissionMode.Byte, PipeOptions.Asynchronous); } } } } } public class PipeSocket { private Socket clientSocket; private Stream pipeSocket; private Action<int> received; private Action<int> sent; public PipeSocket(Socket socket, Stream pipeSocket, Action<int> received, Action<int> sent) { this.clientSocket = socket; this.pipeSocket = pipeSocket; this.received = received; this.sent = sent; } public void Start() { Thread clientThread = new Thread(() => { try { var buffer = new byte[100000]; while (true) { var read = clientSocket.Receive(buffer); if (read == 0) { pipeSocket.Close(); return; } while (true) { try { pipeSocket.Write(buffer, 0, read); sent(read); break; } catch (Exception e2) { Console.WriteLine("Exception when writing to pipe" + e2); } } } } catch (Exception e) { Console.WriteLine("Exception in client thread: " + e); } }); try { Thread senderThread = new Thread(KeepReading); senderThread.Start(); } catch (Exception e) { Console.WriteLine("Exception " + e); } clientThread.Start(); clientThread.Join(); } private void KeepReading() { int totalRead = 0; int toRead = 100024; byte[] bytes = new byte[toRead]; try { while (true) { int howMuchRead = pipeSocket.Read(bytes, 0, toRead); if (howMuchRead == 0) break; totalRead += howMuchRead; received(howMuchRead); clientSocket.Send(bytes, 0, howMuchRead, SocketFlags.None); } } catch (Exception e) { Console.WriteLine("Exception while reading" + e); } } } } |
And now the benchmark:
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Mode: PipeProxy 1 0.687 10 2.024 100 1.998 1000 2.039 10000 2.157 100000 3.131 |
This makes it a little slower than the TCP over file System run locally. However, we can’ run this solution between the host and the guest VM (at least I don’t know how to route named pipes to the VM), but we’ll use this code for something else next time.