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