public void ProcessCurrentBuffer(byte[] currentBuffer, StateObject state)
{
Socket clientSocket = state.ClientSocket;
if (state.ConnectionBuffer.Length == 0)
{
state.ConnectionBuffer = currentBuffer;
}
else
{
state.ConnectionBuffer = ByteUtils.Concatenate(state.ConnectionBuffer, currentBuffer);
}
// we now have all PDU bytes received so far in state.ConnectionBuffer
int bytesLeftInBuffer = state.ConnectionBuffer.Length;
while (bytesLeftInBuffer >= 8)
{
int bufferOffset = state.ConnectionBuffer.Length - bytesLeftInBuffer;
int pduLength = ISCSIPDU.GetPDULength(state.ConnectionBuffer, bufferOffset);
if (pduLength > bytesLeftInBuffer)
{
Log(LogLevel.Debug, "[{0}][ProcessCurrentBuffer] Bytes left in receive buffer: {1}", state.ConnectionIdentifier, bytesLeftInBuffer);
break;
}
else
{
byte[] pduBytes = ByteReader.ReadBytes(state.ConnectionBuffer, bufferOffset, pduLength);
bytesLeftInBuffer -= pduLength;
ISCSIPDU pdu = null;
try
{
pdu = ISCSIPDU.GetPDU(pduBytes);
}
catch (Exception ex)
{
Log(LogLevel.Error, "[{0}][ProcessCurrentBuffer] Failed to read PDU (Exception: {1})", state.ConnectionIdentifier, ex.Message);
RejectPDU reject = new RejectPDU();
reject.Reason = RejectReason.InvalidPDUField;
reject.Data = ByteReader.ReadBytes(pduBytes, 0, 48);
TrySendPDU(state, reject);
}
if (pdu != null)
{
if (pdu.GetType() == typeof(ISCSIPDU))
{
Log(LogLevel.Warning, "[{0}][ProcessCurrentBuffer] Unsupported PDU (0x{1})", state.ConnectionIdentifier, pdu.OpCode.ToString("X"));
// Unsupported PDU
RejectPDU reject = new RejectPDU();
reject.InitiatorTaskTag = pdu.InitiatorTaskTag;
reject.Reason = RejectReason.CommandNotSupported;
reject.Data = ByteReader.ReadBytes(pduBytes, 0, 48);
TrySendPDU(state, reject);
}
else
{
ProcessPDU(pdu, state);
}
}
if (!clientSocket.Connected)
{
// Do not continue to process the buffer if the other side closed the connection
if (bytesLeftInBuffer > 0)
{
Log(LogLevel.Warning, "[{0}][ProcessCurrentBuffer] Buffer processing aborted, bytes left in receive buffer: {1}", state.ConnectionIdentifier, bytesLeftInBuffer);
}
return;
}
}
}
if (bytesLeftInBuffer > 0)
{
state.ConnectionBuffer = ByteReader.ReadBytes(state.ConnectionBuffer, state.ConnectionBuffer.Length - bytesLeftInBuffer, bytesLeftInBuffer);
}
else
{
state.ConnectionBuffer = new byte[0];
}
}
public void ProcessCurrentBuffer(byte[] currentBuffer, StateObject state)
{
if (state.ConnectionBuffer.Length == 0)
{
state.ConnectionBuffer = currentBuffer;
}
else
{
state.ConnectionBuffer = ByteUtils.Concatenate(state.ConnectionBuffer, currentBuffer);
}
// we now have all PDU bytes received so far in state.ConnectionBuffer
int bytesLeftInBuffer = state.ConnectionBuffer.Length;
while (bytesLeftInBuffer >= 8)
{
int bufferOffset = state.ConnectionBuffer.Length - bytesLeftInBuffer;
int pduLength = ISCSIPDU.GetPDULength(state.ConnectionBuffer, bufferOffset);
if (pduLength > bytesLeftInBuffer)
{
break;
}
else
{
byte[] pduBytes = ByteReader.ReadBytes(state.ConnectionBuffer, bufferOffset, pduLength);
bytesLeftInBuffer -= pduLength;
ISCSIPDU pdu = null;
try
{
pdu = ISCSIPDU.GetPDU(pduBytes);
}
catch (UnsupportedSCSICommandException)
{
throw;
}
catch (Exception)
{
throw;
}
if (pdu.GetType() == typeof(ISCSIPDU))
{
/*
* Log("[{0}][ProcessCurrentBuffer] Unsupported PDU (0x{1})", state.Connection.Identifier, pdu.OpCode.ToString("X"));
* // Unsupported PDU
* RejectPDU reject = new RejectPDU();
* reject.Reason = RejectReason.CommandNotSupported;
* reject.StatSN = state.Connection.StatSN;
* reject.ExpCmdSN = state.Connection.ExpCmdSN;
* reject.MaxCmdSN = state.Connection.ExpCmdSN + ISCSIServer.CommandQueueSize;
* reject.Data = ByteReader.ReadBytes(pduBytes, 0, 48);
*
* // StatSN is advanced after a Reject
* state.Connection.StatSN++;
*
* TrySendPDU(state, reject);*/
throw new Exception("Unsupported");
}
else
{
ProcessPDU(pdu, state);
}
}
}
if (bytesLeftInBuffer > 0)
{
state.ConnectionBuffer = ByteReader.ReadBytes(state.ConnectionBuffer, state.ConnectionBuffer.Length - bytesLeftInBuffer, bytesLeftInBuffer);
}
else
{
state.ConnectionBuffer = new byte[0];
}
}