/// <summary>
/// Decode RDPBCGR PDUs from the received message bytes
/// </summary>
/// <param name="endPoint">the endpoint from which the message bytes are received.</param>
/// <param name="receivedBytes">the received message bytes to be decoded.</param>
/// <param name="consumedLength">the length of message bytes consumed by decoder.</param>
/// <param name="expectedLength">the length of message bytes the decoder expects to receive.</param>
/// <returns>the stack packets decoded from the received message bytes.</returns>
internal StackPacket[] DecodePacketCallback(
object endPoint,
byte[] receivedBytes,
out int consumedLength,
out int expectedLength)
{
StackPacket pdu = null;
expectedLength = 0;
// Get bytes for only one packet
byte[] packetData = GetPacket(receivedBytes);
if (null == packetData)
{
// Received bytes does not contain enough data
consumedLength = 0;
return null;
}
consumedLength = packetData.Length;
// Decode PDU
try
{
pdu = DecodePdu(packetData);
if (pdu.GetType() == typeof(Server_X_224_Connection_Confirm_Pdu))
{
// Negotiation-based security-enhanced Connection
client.UpdateTransport();
}
}
catch (FormatException e)
{
pdu = new ErrorPdu(e);
}
// Update client context and client
clientContext.UpdateContext(pdu);
client.CheckDecryptionCount();
return new StackPacket[] { pdu };
}
/// <summary>
/// Decode RDPBCGR PDUs from the received message bytes
/// </summary>
/// <param name="endPoint">the endpoint from which the message bytes are received.</param>
/// <param name="receivedBytes">the received message bytes to be decoded.</param>
/// <param name="consumedLength">the length of message bytes consumed by decoder.</param>
/// <param name="expectedLength">the length of message bytes the decoder expects to receive.</param>
/// <returns>the stack packets decoded from the received message bytes.</returns>
internal StackPacket[] DecodePacketCallback(
object endPoint,
byte[] receivedBytes,
out int consumedLength,
out int expectedLength)
{
StackPacket pdu = null;
expectedLength = 0;
// Get bytes for only one packet
byte[] packetData = GetPacket(receivedBytes);
if (null == packetData)
{
// Received bytes does not contain enough data
consumedLength = 0;
return null;
}
consumedLength = packetData.Length;
for (int i = 0; i < server.ServerContext.SessionContexts.Count; i++)
{
if (endPoint == server.ServerContext.SessionContexts[i].Identity)
{
try
{
// ETW Provider Dump Message
string messageName;
if (ConstValue.SLOW_PATH_PDU_INDICATOR_VALUE == packetData[ConstValue.SLOW_PATH_PDU_INDICATOR_INDEX])
{
// Slow-Path
messageName = "RDPBCGR:ReceivedSlowPathPDU";
}
else
{
// Fast-Path
messageName = "RDPBCGR:ReceivedFastPathPDU";
}
ExtendedLogger.DumpMessage(messageName, RdpbcgrUtility.DumpLevel_Layer0, "Received Original RDPBCGR Message", packetData);
pdu = DecodePdu(server.ServerContext.SessionContexts[i], packetData);
}
catch (FormatException e)
{
pdu = new ErrorPdu(e, packetData);
}
// Update client context and client
server.ServerContext.SessionContexts[i].UpdateContext(pdu);
server.CheckDecryptionCount(server.ServerContext.SessionContexts[i]);
break;
}
else
{
pdu = null;
}
}
return new StackPacket[] { pdu };
}
