/// <summary>
/// Handle incoming TCP packets according to current connection status.
/// </summary>
/// <param name="packet">Packet to receive.</param>
/// <exception cref="OverflowException">Thrown on fatal error (contact support).</exception>
/// <exception cref="Sys.IO.IOException">Thrown on IO error.</exception>
internal void ReceiveData(TCPPacket packet)
{
Global.mDebugger.Send("[" + table[(int)Status] + "] " + packet.ToString());
switch (Status)
{
case Status.LISTEN:
ProcessListen(packet);
break;
case Status.SYN_SENT:
ProcessSynSent(packet);
break;
case Status.SYN_RECEIVED:
ProcessSynReceived(packet);
break;
case Status.ESTABLISHED:
ProcessEstablished(packet);
break;
case Status.FIN_WAIT1:
ProcessFinWait1(packet);
break;
case Status.FIN_WAIT2:
ProcessFinWait2(packet);
break;
case Status.CLOSE_WAIT:
ProcessCloseWait(packet);
break;
case Status.CLOSING:
ProcessClosing(packet);
break;
case Status.LAST_ACK:
ProcessCloseWait(packet);
break;
case Status.TIME_WAIT:
break;
case Status.CLOSED:
break;
default:
throw new Exception("Unknown TCP connection state.");
}
}
/// <summary>
/// Handle incoming TCP packets according to current connection status.
/// </summary>
/// <param name="packet">Packet to receive.</param>
/// <exception cref="OverflowException">Thrown on fatal error (contact support).</exception>
/// <exception cref="Sys.IO.IOException">Thrown on IO error.</exception>
internal void ReceiveData(TCPPacket packet)
{
Global.mDebugger.Send("[" + table[(int)Status] + "] " + packet.ToString());
if (Status == Status.CLOSED)
{
//DO NOTHING
}
else if (Status == Status.LISTEN)
{
ProcessListen(packet);
}
else if (Status == Status.SYN_SENT)
{
ProcessSynSent(packet);
}
else
{
// Check sequence number and segment data.
if (TCB.RcvNxt <= packet.SequenceNumber && packet.SequenceNumber + packet.TCP_DataLength < TCB.RcvNxt + TCB.RcvWnd)
{
switch (Status)
{
case Status.SYN_RECEIVED:
ProcessSynReceived(packet);
break;
case Status.ESTABLISHED:
ProcessEstablished(packet);
break;
case Status.FIN_WAIT1:
ProcessFinWait1(packet);
break;
case Status.FIN_WAIT2:
ProcessFinWait2(packet);
break;
case Status.CLOSE_WAIT:
ProcessCloseWait(packet);
break;
case Status.CLOSING:
ProcessClosing(packet);
break;
case Status.LAST_ACK:
ProcessCloseWait(packet);
break;
case Status.TIME_WAIT:
break;
default:
Global.mDebugger.Send("Unknown TCP connection state.");
break;
}
}
else
{
if (!packet.RST)
{
SendEmptyPacket(Flags.ACK);
}
Global.mDebugger.Send("Sequence number or segment data invalid, packet passed.");
}
}
}
