public void ScanHost()
{
foreach (NetworkInterface adapter in NetworkInterface.GetAllNetworkInterfaces())
{
if (!adapter.OperationalStatus.Equals(OperationalStatus.Up))
{
continue;
}
foreach (UnicastIPAddressInformation unicastIPInfo in adapter.GetIPProperties().UnicastAddresses)
{
if (unicastIPInfo.Address.AddressFamily == AddressFamily.InterNetwork)
{
string localAddress = unicastIPInfo.Address.ToString();
if (!LocalFullAddresses.Contains(localAddress))
{
LocalFullAddresses.Add(localAddress);
}
string broadcastAddress = GetBroadcastAddress(unicastIPInfo);
if (BroadcastAddresses.Contains(broadcastAddress))
{
continue;
}
Output.WriteLine($"Local machine ip address: {unicastIPInfo.Address}, {unicastIPInfo.IPv4Mask}, broadCast address: {broadcastAddress}");
BroadcastAddresses.Add(broadcastAddress);
}
}
}
Output.WriteLine("Finished searching local network addresses.");
}
private void AsyncCallbackBroadcastSocket(IAsyncResult result)
{
if (BroadcastClientSocket != null)
{
try
{
int size = BroadcastClientSocket.EndReceiveFrom(result, ref BroadcastRemoteEndPoint);
string address = BroadcastRemoteEndPoint.ToString().Split(':')[0];
if (!ServerAddresses.Contains(address) && !LocalFullAddresses.Contains(address))
{
Output.WriteLine($"Got a server address: {address}");
AddNewClient(address);
}
//Have to keep listening on the same BroadCast socket, due to other broadcast addresses may reply
BroadcastClientSocket.BeginReceiveFrom(new byte[1024], 0, 1024, SocketFlags.None, ref BroadcastRemoteEndPoint, new AsyncCallback(AsyncCallbackBroadcastSocket), null);
}
catch (Exception exception)
{
Output.WriteLine($"Error in AsyncCallback of Broadcast socket:\n{exception}");
}
}
}
