public void initializeServer(int port)
{
IPEndPoint endpoint = new IPEndPoint(IPAddress.Any, port);
serversocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
serversocket.Bind(endpoint);
clientSockets = new Dictionary <IPEndPoint, Socket>();
Console.WriteLine("Server Initialized");
TCPCopyCatController.startListenOnSocketAsync(serversocket, ServerReceivedPacketCallback);
}
public async Task <TCPCopyCatController.responseCode> connectToServer(IPEndPoint serverEndpoint)
{
const int connectionSequenceNumber = 0;
if (socket == null)
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
else if (socket.IsBound)
{
return(await getPacketResponse(connectionSequenceNumber + 1));
}
TCPCopyCatController.startListenOnSocketAsync(socket, onPacketReceive);
IPEndPoint test = new IPEndPoint(IPAddress.Any, 0);
socket.Bind(test);
this.serverEndpoint = serverEndpoint;
TCPCopycatPacket.TCPCopycatHeader header = new TCPCopycatPacket.TCPCopycatHeader();
header.SYN = 1;
header.sequenceNumber = connectionSequenceNumber;
header.ACK = 0;
header.dataLenght = 0;
TCPCopycatPacket connectionPacket = new TCPCopycatPacket(header, new byte[1]);
TCPCopycatReceiveMessageCallback receivedMessageCallbackLambda = delegate(TCPCopycatPacket packet, IPEndPoint sender)
{
if (packet.header.SYN == 1 && packet.header.acknowledgeNumber == (connectionSequenceNumber + 1))
{
this.serverEndpoint = sender;
return(TCPCopyCatController.responseCode.OK);
}
return(TCPCopyCatController.responseCode.UNKNOWN_ERROR);
};
if (!TCPCopyCatController.sendMessageToEndPoint(socket, serverEndpoint, connectionPacket))
{
registerPacket(connectionPacket, receivedMessageCallbackLambda, 1000);
return(await getPacketResponse(connectionSequenceNumber + 1));
}
else
{
return(TCPCopyCatController.responseCode.BAD_REQUEST);
}
}
public void ServerReceivedPacketCallback(TCPCopycatPacket packet, IPEndPoint sender)
{
Console.WriteLine("Received new connection from " + sender.Address + " port: " + sender.Port);
clientSockets.Add(sender, new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp));
IPEndPoint qwe = new IPEndPoint(IPAddress.Any, 0);
clientSockets[sender].Bind(qwe);
packetReceived.Add(GetClientSocketFromEndpoint(sender), new HashSet <int>());
filePacketList.Add(GetClientSocketFromEndpoint(sender), new List <TCPCopycatPacket>());
Console.WriteLine("Client socket listening on port: " + sender.Port.ToString());
TCPCopyCatController.startListenOnSocketAsync(GetClientSocketFromEndpoint(sender), ClientSocketReceivedPacketCallback);
packet.header.acknowledgeNumber = packet.header.sequenceNumber + 1;
TCPCopyCatController.sendMessageToEndPoint(GetClientSocketFromEndpoint(sender), sender, packet);
}