private int GetMaxiumPayloadSizeForSourcePacket(int upStreamMtu)
{
// Create a fake empty RDPEUDP ACK+SOURCE packet.
var packet = new RdpeudpPacket();
packet.fecHeader.snSourceAck = 0;
packet.fecHeader.uReceiveWindowSize = 0;
packet.fecHeader.uFlags = RDPUDP_FLAG.RDPUDP_FLAG_DATA | RDPUDP_FLAG.RDPUDP_FLAG_ACK;
var ackVectorHeader = new RDPUDP_ACK_VECTOR_HEADER();
ackVectorHeader.uAckVectorSize = 0;
ackVectorHeader.AckVectorElement = null;
ackVectorHeader.Padding = null;
packet.ackVectorHeader = ackVectorHeader;
var sourceHeader = new RDPUDP_SOURCE_PAYLOAD_HEADER();
sourceHeader.snCoded = 0;
sourceHeader.snSourceStart = 0;
packet.sourceHeader = sourceHeader;
var size = PduMarshaler.Marshal(packet).Length;
// Maximum payload size = upstream MTU - empty ACK+SOURCE header size.
return upStreamMtu - size;
}
public void S2_DataTransfer_RetransmitTest_ClientRetransmit()
{
// Record the sequenceNumber of the lost source packet.
uint sequenceNumberForLossPacket = 0;
ushort receiveWindowSize = 0;
Site.Log.Add(LogEntryKind.Debug, "Establishing RDP connection ...");
StartRDPConnection();
this.TestSite.Log.Add(LogEntryKind.Comment, "Create a reliable UDP connection.");
this.EstablishUDPConnection(TransportMode.Reliable, waitTime, true);
this.TestSite.Log.Add(LogEntryKind.Comment, "Send the first RDPEUDP Source packet, but not acknowledge the receipt of the first source packet from client.");
RdpeudpPacket packet = this.GetFirstValidUdpPacket(TransportMode.Reliable);
#region Change packet.ackVectorHeader To Not Acknowledge The Receipt
RDPUDP_ACK_VECTOR_HEADER ackVectorHeader = new RDPUDP_ACK_VECTOR_HEADER();
ackVectorHeader.AckVectorElement = null;
ackVectorHeader.uAckVectorSize = 0;
packet.ackVectorHeader = ackVectorHeader;
sequenceNumberForLossPacket = packet.fecHeader.snSourceAck;
receiveWindowSize = packet.fecHeader.uReceiveWindowSize;
packet.fecHeader.snSourceAck--;
#endregion Change packet.ackVectorHeader To Not Acknowledge The Receipt
this.SendPacket(TransportMode.Reliable, packet);
this.TestSite.Log.Add(LogEntryKind.Comment, "Wait for 200 ms so as to fire the retransmit timer.");
Thread.Sleep(this.RetransmitTimer);
this.TestSite.Log.Add(LogEntryKind.Comment, "Wait for the client to resend the lost packet.");
RdpeudpPacket receivedPacket = this.WaitForSourcePacket(TransportMode.Reliable, waitTime, sequenceNumberForLossPacket);
Site.Assert.IsNotNull(receivedPacket, "Client should resend the packet if not receiving an ACK for a specified time.");
}
