64 lines
2.1 KiB
C#
64 lines
2.1 KiB
C#
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using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Threading.Tasks;
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namespace MediaBrowser.ApiInteraction
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{
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public static class ServerDiscovery
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{
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/// <summary>
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/// Attemps to discover the server within a local network
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/// </summary>
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public static async Task<IPEndPoint> DiscoverServer()
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{
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// Create a udp client
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var client = new UdpClient(new IPEndPoint(IPAddress.Any, GetRandomUnusedPort()));
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// Construct the message the server is expecting
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var bytes = Encoding.UTF8.GetBytes("who is MediaBrowserServer?");
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// Send it - must be IPAddress.Broadcast, 7359
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var targetEndPoint = new IPEndPoint(IPAddress.Broadcast, 7359);
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// Send it
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await client.SendAsync(bytes, bytes.Length, targetEndPoint).ConfigureAwait(false);
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// Get a result back
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var result = await client.ReceiveAsync().ConfigureAwait(false);
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if (result.RemoteEndPoint.Port == targetEndPoint.Port)
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{
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// Convert bytes to text
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var text = Encoding.UTF8.GetString(result.Buffer);
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// Expected response : MediaBrowserServer|192.168.1.1:1234
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// If the response is what we're expecting, proceed
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if (text.StartsWith("mediabrowserserver", StringComparison.OrdinalIgnoreCase))
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{
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text = text.Split('|')[1];
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var vals = text.Split(':');
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return new IPEndPoint(IPAddress.Parse(vals[0]), int.Parse(vals[1]));
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}
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}
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return null;
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}
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/// <summary>
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/// Gets a random port number that is currently available
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/// </summary>
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private static int GetRandomUnusedPort()
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{
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var listener = new TcpListener(IPAddress.Any, 0);
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listener.Start();
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var port = ((IPEndPoint)listener.LocalEndpoint).Port;
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listener.Stop();
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return port;
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}
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}
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}
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