jellyfin/MediaBrowser.ApiInteraction/ServerDiscovery.cs
2013-02-20 20:33:05 -05:00

64 lines
2.1 KiB
C#

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