public void onReadable(SelectionKey key)
{
try
{
var buffer = ByteBuffer.Allocate(FirewallVpnService.MUTE_SIZE);
buffer.Clear();
int bytesRead = mInnerChannel.Read(buffer);
if (bytesRead > 0)
{
buffer.Flip();
afterReceived(buffer);
sendToBrother(key, buffer);
}
else if (bytesRead < 0)
{
Dispose();
}
}
catch (Exception ex)
{
Debug.Fail($"onReadable catch an exception: {ex.ToString()}");
Dispose();
}
}
private void processInput(SelectionKey key, List <SelectionKey> keyIterator)
{
System.Console.WriteLine("TCP In");
try
{
if (keyIterator[0] != null)
{
keyIterator.RemoveAt(0);
}
ByteBuffer receiveBuffer = ByteBufferPool.acquire();
// Leave space for the header
receiveBuffer.Position(HEADER_SIZE);
TCB tcb = (TCB)key.Attachment();
lock (tcb)
{
Packet referencePacket = tcb.referencePacket;
SocketChannel inputChannel = (SocketChannel)key.Channel();
int readBytes;
try
{
readBytes = inputChannel.Read(receiveBuffer);
}
catch (IOException e)
{
Log.Error(TAG, "Network read error: " + tcb.ipAndPort, e);
referencePacket.updateTCPBuffer(receiveBuffer, (byte)Packet.TCPHeader.RST, 0, tcb.myAcknowledgementNum, 0);
outputQueue.Offer(receiveBuffer);
TCB.CloseTCB(tcb);
return;
}
if (readBytes == -1)
{
// End of stream, stop waiting until we push more data
//key.InterestOps(0);
key.InterestOps();
tcb.waitingForNetworkData = false;
if (tcb.status != TCBStatus.CLOSE_WAIT)
{
ByteBufferPool.Release(receiveBuffer);
return;
}
tcb.status = TCBStatus.LAST_ACK;
referencePacket.updateTCPBuffer(receiveBuffer, (byte)Packet.TCPHeader.FIN, tcb.mySequenceNum, tcb.myAcknowledgementNum, 0);
tcb.mySequenceNum++; // FIN counts as a byte
}
else
{
// XXX: We should ideally be splitting segments by MTU/MSS, but this seems to work without
referencePacket.updateTCPBuffer(receiveBuffer, (byte)(Packet.TCPHeader.PSH | Packet.TCPHeader.ACK),
tcb.mySequenceNum, tcb.myAcknowledgementNum, readBytes);
tcb.mySequenceNum += readBytes; // Next sequence number
receiveBuffer.Position(HEADER_SIZE + readBytes);
}
}
outputQueue.Offer(receiveBuffer);
}
catch (Java.Lang.Exception ex)
{
System.Console.WriteLine(ex.Message);
}
}
