public static void Start()
{
try
{
_udpServer = new UdpClient(8888, AddressFamily.InterNetwork);
Task.Factory.StartNew(async() =>
{
App.SetText("Waiting for broadcast...");
while (true)
{
UdpReceiveResult data = await _udpServer.ReceiveAsync();
if (ConnectionCodes.RecieveCom(Encoding.UTF8.GetString(data.Buffer)) == ConnectionCodes.UDP_CLIENT_DISCOVERY_REQUEST)
{
App.SetText("Broadcast recieved");
string toSend = ConnectionCodes.UdpResponseCode();
byte[] sendingBuffor = Encoding.ASCII.GetBytes(toSend);
await _udpServer.SendAsync(sendingBuffor, sendingBuffor.Length, data.RemoteEndPoint);
Console.WriteLine(toSend);
}
}
});
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
public bool CheckIfCodeIsValid(Socket socket)
{
var code = "1234";
//GenerateCode(); //generate code
App.SetCodeOnForm(code); //show code
bool valid = false;
int counter = 0;
do
{
SendMessageFromString(ConnectionCodes.SendServerCodeRequest(counter), socket);
var str = RecieveToString(socket);
var com = ConnectionCodes.RecieveCom(str);
var codeR = ConnectionCodes.RecieveSecurityCode(str);
if (com == ConnectionCodes.CLIENT_CODE_RESPONSE && codeR == /*code*/ "1234")//CHANGE IT!!!
{
valid = true;
}
else
{
counter++;
}
} while (!valid && counter <= 25);
return(counter <= 25 && valid);
}
public void AcceptCallback(IAsyncResult ar)
{
Socket socket;
try
{
socket = ServerSocket.EndAccept(ar);
ServerSocket.BeginAccept(AcceptCallback, null);
}
catch (ObjectDisposedException)
{
return;
}
ClientSockets.Add(socket);
var com = ConnectionCodes.RecieveCom(RecieveToString(socket)); // FIRST STEP
if (com != ConnectionCodes.CLIENT_BEGIN_SETUP)
{
return;
}
if (!CheckIfCodeIsValid(socket)) //SECOND STEP (RECIEVING security_code)
{
return;
}
var aesCrypt = new AesCypher();
SendMessageFromString(ConnectionCodes.EncryptionKeyExchange(aesCrypt.AlgoKeyHexString), socket); //THIRD STEP SEND ENC CODE
//FOURTH STEP GET CLIENT ID
var recieveString = RecieveToString(socket);
com = ConnectionCodes.RecieveCom(recieveString);
if (com != ConnectionCodes.CLIENT_PORT_REQUEST)
{
return;
}
if (ConnectionCodes.ClientId(recieveString) == string.Empty)
{
return;
}
CyphersDictionary.Add(ConnectionCodes.ClientId(recieveString), aesCrypt); //ADD ID TO DICT
var extIp = string.Empty;
var extPort = 0;
if (!WanService.GetExternalIpAdress(out extIp))
{
MessageBox.Show("Error when getting external IP!");
return;
}
if (!WanService.OpenNewPortForUpnp(out extPort))
{
MessageBox.Show("Error when opening new port for UnPnP!");
return;
}
SendMessageFromString(ConnectionCodes.SetupPortResponse(extPort, extIp), socket); //FIFTH STEP SEND EXTERNAL PORT AND IP DATA
if (ConnectionCodes.RecieveCom(RecieveToString(socket)) != ConnectionCodes.CLIENT_CONFIRM) //SIXTH STEP CONFIRMATION
{
return;
}
SendMessageFromString(ConnectionCodes.SendCom(ConnectionCodes.SERVER_CONFIRM), socket);
}
