private void ProcessRPCRequest(RPCPDU rpcRequest)
{
if (rpcRequest is BindPDU)
{
BindAckPDU bindAckPDU = RemoteServiceHelper.GetRPCBindResponse((BindPDU)rpcRequest, m_service);
m_maxTransmitFragmentSize = bindAckPDU.MaxTransmitFragmentSize;
Append(bindAckPDU.GetBytes());
}
else if (m_maxTransmitFragmentSize.HasValue && rpcRequest is RequestPDU) // if BindPDU was not received, we treat as protocol error
{
List <RPCPDU> responsePDUs = RemoteServiceHelper.GetRPCResponse((RequestPDU)rpcRequest, m_service, m_maxTransmitFragmentSize.Value);
foreach (RPCPDU responsePDU in responsePDUs)
{
Append(responsePDU.GetBytes());
}
}
else
{
FaultPDU faultPDU = new FaultPDU();
faultPDU.Flags = PacketFlags.FirstFragment | PacketFlags.LastFragment;
faultPDU.DataRepresentation = new DataRepresentationFormat(CharacterFormat.ASCII, ByteOrder.LittleEndian, FloatingPointRepresentation.IEEE);
faultPDU.CallID = 0;
faultPDU.AllocationHint = RPCPDU.CommonFieldsLength + FaultPDU.FaultFieldsLength;
faultPDU.Status = FaultStatus.ProtocolError;
Append(faultPDU.GetBytes());
}
}
public static List <RPCPDU> GetRPCResponse(RequestPDU requestPDU, RemoteService service, int maxTransmitFragmentSize)
{
List <RPCPDU> result = new List <RPCPDU>();
byte[] responseBytes;
try
{
responseBytes = service.GetResponseBytes(requestPDU.OpNum, requestPDU.Data);
}
catch (UnsupportedOpNumException)
{
FaultPDU faultPDU = new FaultPDU
{
Flags = PacketFlags.FirstFragment | PacketFlags.LastFragment | PacketFlags.DidNotExecute,
DataRepresentation = requestPDU.DataRepresentation,
CallID = requestPDU.CallID,
AllocationHint = RPCPDU.CommonFieldsLength + FaultPDU.FaultFieldsLength,
// Windows will return either nca_s_fault_ndr or nca_op_rng_error.
Status = FaultStatus.OpRangeError
};
result.Add(faultPDU);
return(result);
}
int offset = 0;
int maxPDUDataLength = maxTransmitFragmentSize - RPCPDU.CommonFieldsLength - ResponsePDU.ResponseFieldsLength;
do
{
ResponsePDU responsePDU = new ResponsePDU();
int pduDataLength = Math.Min(responseBytes.Length - offset, maxPDUDataLength);
responsePDU.DataRepresentation = requestPDU.DataRepresentation;
responsePDU.CallID = requestPDU.CallID;
responsePDU.AllocationHint = (uint)(responseBytes.Length - offset);
responsePDU.Data = ByteReader.ReadBytes(responseBytes, offset, pduDataLength);
if (offset == 0)
{
responsePDU.Flags |= PacketFlags.FirstFragment;
}
if (offset + pduDataLength == responseBytes.Length)
{
responsePDU.Flags |= PacketFlags.LastFragment;
}
result.Add(responsePDU);
offset += pduDataLength;
}while (offset < responseBytes.Length);
return(result);
}
