using System;
using System.Net;
using System.Net.Sockets;
+using System.Collections.Generic;
namespace MonoTests.Helpers {
public static class NetworkHelpers
{
+ static Random rndPort = new Random ();
+ static HashSet<int> portsTable = new HashSet<int> ();
+
public static int FindFreePort ()
{
- TcpListener l = new TcpListener(IPAddress.Loopback, 0);
- l.Start();
- int port = ((IPEndPoint)l.LocalEndpoint).Port;
- l.Stop();
- return port;
+ return LocalEphemeralEndPoint ().Port;
}
+
public static IPEndPoint LocalEphemeralEndPoint ()
{
- return new IPEndPoint (IPAddress.Loopback, FindFreePort());
+ int counter = 0;
+
+ while (counter < 1000) {
+ var testingPort = rndPort.Next (10000, 60000);
+
+ var ep = new IPEndPoint (IPAddress.Loopback, testingPort);
+
+ lock (portsTable) {
+ if (portsTable.Contains (testingPort))
+ continue;
+
+ ++counter;
+
+ try {
+ using (var socket = new Socket (ep.AddressFamily, SocketType.Stream, ProtocolType.Tcp)) {
+ socket.Bind (ep);
+ socket.Close ();
+ }
+
+ portsTable.Add (testingPort);
+ return ep;
+ } catch (SocketException) { }
+ }
+ }
+
+ throw new ApplicationException ($"Could not find available local port after {counter} retries");
}
}
}