public static void ListenForBroadcast(int serverPort)
{
var fallback = new ExpFallback(100, 60 * 1000);
var udpClient = new UdpClient(DISCOVERY_PORT)
{
Client = { ReceiveTimeout = 0 }
};
IPEndPoint remoteEndpoint = null;
while (true)
{
try
{
var receivedBytes = udpClient.Receive(ref remoteEndpoint);
if (receivedBytes.SequenceEqual(MagicBroadcastBytes))
{
var responseBytes = MagicResponseBytes
.Concat(BitConverter.GetBytes(serverPort))
.Concat(Encoding.UTF8.GetBytes(Environment.MachineName))
.ToArray();
udpClient.Send(responseBytes, responseBytes.Length, remoteEndpoint);
}
}
catch (SocketException)
{
Thread.Sleep(fallback.Value);
fallback.Increase();
}
}
}
public static void SendBroadcast(Action <string, IPEndPoint> callback)
{
var udpClient = new UdpClient {
Client = { ReceiveTimeout = 1000 }
};
udpClient.Send(MagicBroadcastBytes, MagicBroadcastBytes.Length,
new IPEndPoint(IPAddress.Broadcast, DISCOVERY_PORT));
var fallback = new ExpFallback(100, 60 * 1000);
IPEndPoint remoteEndpoint = null;
var stopwatch = new Stopwatch();
stopwatch.Start();
while (true)
{
try
{
var receivedBytes = udpClient.Receive(ref remoteEndpoint);
var portIndex = MagicResponseBytes.Length;
var nameIndex = portIndex + 4;
if (receivedBytes.Length >= nameIndex &&
receivedBytes.Take(portIndex).SequenceEqual(MagicResponseBytes))
{
var port = BitConverter.ToInt32(receivedBytes, portIndex);
var computerName = "";
try
{
computerName = Encoding.UTF8.GetString(receivedBytes, nameIndex,
receivedBytes.Length - nameIndex);
}
catch (ArgumentException)
{
}
callback(computerName, new IPEndPoint(remoteEndpoint.Address, port));
}
}
catch (SocketException)
{
Thread.Sleep(fallback.Value);
fallback.Increase();
}
if (stopwatch.ElapsedMilliseconds > 10000)
{
return;
}
}
}