/// <summary>
/// Finds entry points on the local network
/// </summary>
/// <param name="callback">A callback to be called when new entry points are discovered, nullable</param>
/// <returns>A list of entry points</returns>
public static async Task <EntryPoint[]> FindEntryPoints(EntryPointCallback callback = null)
{
Initialize();
Random rand = new Random();
using (UdpClient cl = new UdpClient())
{
uint nonce = (uint)rand.Next(0, Int32.MaxValue);
byte[] bc = new UdpCDiscover(nonce).Build();
await cl.SendAsync(bc, bc.Length, new IPEndPoint(IPAddress.Broadcast, 2888));
List <EntryPoint> epl = new List <EntryPoint>();
while (true)
{
var ar = cl.BeginReceive(null, null);
ar.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(500));
if (!ar.IsCompleted)
{
break;
}
try
{
IPEndPoint ipep = null;
byte[] res = cl.EndReceive(ar, ref ipep);
Packet thisPack = new Packet(res, ipep);
if (thisPack.Nonce != nonce)
{
continue;
}
if (thisPack.PacketType != PackType.UDP_S_DISCOVER_REPLY)
{
continue;
}
UdpSDiscoverReply rep = new UdpSDiscoverReply(thisPack);
var ep = new EntryPoint(new IPEndPoint(ipep.Address, (int)rep.PortNumber), rep.Certificate);
if (callback != null)
{
callback(ep);
}
epl.Add(ep);
}
catch (Exception e)
{
Console.Error.WriteLine(e);
break;
}
}
return(epl.ToArray());
}
}
public static async Task UdpCDiscover(Packet pack)
{
byte[] ts = new UdpSDiscoverReply((uint)TcpManager.PortNumber, pack.Nonce, SslManager.Certificate).Build();
await UdpManager.Transmit(pack.ClientAddress, ts);
}
