/// <summary>
/// Receive TcpClient from remote computer.
/// </summary>
/// <returns>Accepted TcpClient</returns>
/// <exception cref="Exception">Thrown if TcpListener not started.</exception>
public TcpClient AcceptTcpClient(int timeout = -1)
{
if (StateMachine == null)
{
new Exception("TcpListener is not started.");
}
if (StateMachine.Status == Status.CLOSED) // if TcpListener already accepted client, remove old one.
{
Tcp.RemoveConnection(StateMachine.LocalEndPoint.Port, StateMachine.RemoteEndPoint.Port, StateMachine.LocalEndPoint.Address, StateMachine.RemoteEndPoint.Address);
Start();
}
if (timeout == -1)
{
while (StateMachine.WaitStatus(Status.ESTABLISHED) != true)
{
;
}
}
else
{
while (StateMachine.WaitStatus(Status.ESTABLISHED, timeout) != true)
{
;
}
}
return(new TcpClient(StateMachine));
}
/// <summary>
/// Connect to client.
/// </summary>
/// <param name="dest">Destination address.</param>
/// <param name="destPort">Destination port.</param>
/// <exception cref="Exception">Thrown if TCP Status is not CLOSED.</exception>
public void Connect(Address dest, int destPort, int timeout = 5000)
{
if (StateMachine.Status != Status.CLOSED)
{
throw new Exception("Client must be closed before setting a new connection.");
}
StateMachine.destination = dest;
StateMachine.destinationPort = destPort;
StateMachine.source = IPConfig.FindNetwork(dest);
//Generate Random Sequence Number
var rnd = new Random();
StateMachine.SequenceNumber = (uint)((rnd.Next(0, Int32.MaxValue)) << 32) | (uint)(rnd.Next(0, Int32.MaxValue));
// Flags=0x02 -> Syn
var packet = new TCPPacket(StateMachine.source, StateMachine.destination, (ushort)StateMachine.localPort, (ushort)destPort, StateMachine.SequenceNumber, 0, 20, (byte)Flags.SYN, 0xFAF0, 0);
OutgoingBuffer.AddPacket(packet);
NetworkStack.Update();
StateMachine.Status = Status.SYN_SENT;
if (StateMachine.WaitStatus(Status.ESTABLISHED, timeout) == false)
{
throw new Exception("Failed to open TCP connection!");
}
}
/// <summary>
/// Receive TcpClient from remote computer.
/// </summary>
/// <returns>Accepted TcpClient</returns>
public TcpClient AcceptTcpClient(int timeout = -1)
{
if (timeout == -1)
{
while (StateMachine.WaitStatus(Status.ESTABLISHED) != true)
{
;
}
}
else
{
while (StateMachine.WaitStatus(Status.ESTABLISHED, timeout) != true)
{
;
}
}
return(new TcpClient(StateMachine));
}
/// <summary>
/// Connect to client.
/// </summary>
/// <param name="dest">Destination address.</param>
/// <param name="destPort">Destination port.</param>
/// <exception cref="Exception">Thrown if TCP Status is not CLOSED.</exception>
public void Connect(Address dest, int destPort, int timeout = 5000)
{
if (StateMachine.Status == Status.ESTABLISHED)
{
throw new Exception("Client must be closed before setting a new connection.");
}
StateMachine.RemoteEndPoint.Address = dest;
StateMachine.LocalEndPoint.Address = IPConfig.FindNetwork(dest);
StateMachine.RemoteEndPoint.Port = (ushort)destPort;
//Generate Random Sequence Number
var rnd = new Random();
var SequenceNumber = (uint)((rnd.Next(0, Int32.MaxValue)) << 32) | (uint)(rnd.Next(0, Int32.MaxValue));
//Fill TCB
StateMachine.TCB.SndUna = SequenceNumber;
StateMachine.TCB.SndNxt = SequenceNumber;
StateMachine.TCB.SndWnd = Tcp.TcpWindowSize;
StateMachine.TCB.SndUp = 0;
StateMachine.TCB.SndWl1 = 0;
StateMachine.TCB.SndWl2 = 0;
StateMachine.TCB.ISS = SequenceNumber;
StateMachine.TCB.RcvNxt = 0;
StateMachine.TCB.RcvWnd = Tcp.TcpWindowSize;
StateMachine.TCB.RcvUp = 0;
StateMachine.TCB.IRS = 0;
Tcp.Connections.Add(StateMachine);
StateMachine.SendEmptyPacket(Flags.SYN);
StateMachine.Status = Status.SYN_SENT;
if (StateMachine.WaitStatus(Status.ESTABLISHED, timeout) == false)
{
throw new Exception("Failed to open TCP connection!");
}
}
