internal static ISCSIPDU GetSCSIDataOutResponsePDU(SCSIDataOutPDU request, ISCSITarget target, SessionParameters session, ConnectionParameters connection) { string connectionIdentifier = StateObject.GetConnectionIdentifier(session, connection); TransferEntry transfer = connection.GetTransferEntry(request.TargetTransferTag); if (transfer == null) { ISCSIServer.Log("[{0}][GetSCSIDataOutResponsePDU] Invalid TargetTransferTag {1}", connectionIdentifier, request.TargetTransferTag); RejectPDU reject = new RejectPDU(); reject.InitiatorTaskTag = request.InitiatorTaskTag; reject.Reason = RejectReason.InvalidPDUField; reject.Data = ByteReader.ReadBytes(request.GetBytes(), 0, 48); return(reject); } ushort LUN = (ushort)request.LUN; Disk disk = target.Disks[LUN]; uint offset = request.BufferOffset; uint totalLength = (uint)transfer.CommandDataBuffer.Length; // Store segment (we only execute the command after receiving all of its data) Array.Copy(request.Data, 0, transfer.CommandDataBuffer, offset, request.DataSegmentLength); ISCSIServer.Log(String.Format("[{0}][GetSCSIDataOutResponsePDU] Buffer offset: {1}, Total length: {2}", connectionIdentifier, offset, totalLength)); if (offset + request.DataSegmentLength == totalLength) { // Last Data-out PDU ISCSIServer.Log("[{0}][GetSCSIDataOutResponsePDU] Last Data-out PDU", connectionIdentifier); byte[] scsiResponse; SCSIStatusCodeName status = target.ExecuteCommand(transfer.CommandBytes, request.LUN, transfer.CommandDataBuffer, out scsiResponse); SCSIResponsePDU response = new SCSIResponsePDU(); response.InitiatorTaskTag = request.InitiatorTaskTag; response.Status = status; response.Data = scsiResponse; connection.RemoveTransfer(request.TargetTransferTag); return(response); } else { // Send R2T ReadyToTransferPDU response = new ReadyToTransferPDU(); response.InitiatorTaskTag = request.InitiatorTaskTag; response.TargetTransferTag = request.TargetTransferTag; response.R2TSN = transfer.NextR2NSN; response.BufferOffset = offset + request.DataSegmentLength; // where we left off response.DesiredDataTransferLength = Math.Min((uint)connection.TargetMaxRecvDataSegmentLength, totalLength - response.BufferOffset); transfer.NextR2NSN++; return(response); } }
public void ProcessPDU(ISCSIPDU pdu, StateObject state) { Socket clientSocket = state.ClientSocket; uint?cmdSN = PDUHelper.GetCmdSN(pdu); Log(LogLevel.Debug, "[{0}][ProcessPDU] Received PDU from initiator, Operation: {1}, Size: {2}, CmdSN: {3}", state.ConnectionIdentifier, (ISCSIOpCodeName)pdu.OpCode, pdu.Length, cmdSN); // RFC 3720: On any connection, the iSCSI initiator MUST send the commands in increasing order of CmdSN, // except for commands that are retransmitted due to digest error recovery and connection recovery. if (cmdSN.HasValue) { if (state.SessionParameters.CommandNumberingStarted) { if (cmdSN != state.SessionParameters.ExpCmdSN) { Log(LogLevel.Warning, "[{0}][ProcessPDU] CmdSN outside of expected range", state.ConnectionIdentifier); // We ignore this PDU return; } } else { state.SessionParameters.ExpCmdSN = cmdSN.Value; state.SessionParameters.CommandNumberingStarted = true; } if (pdu is LogoutRequestPDU || pdu is TextRequestPDU || pdu is SCSICommandPDU || pdu is RejectPDU) { if (!pdu.ImmediateDelivery) { state.SessionParameters.ExpCmdSN++; } } } if (pdu is LoginRequestPDU) { LoginRequestPDU request = (LoginRequestPDU)pdu; Log(LogLevel.Information, "[{0}][ReceiveCallback] Login Request, current stage: {1}, next stage: {2}, parameters: {3}", state.ConnectionIdentifier, request.CurrentStage, request.NextStage, KeyValuePairUtils.ToString(request.LoginParameters)); if (request.TSIH != 0) { // RFC 3720: A Login Request with a non-zero TSIH and a CID equal to that of an existing // connection implies a logout of the connection followed by a Login lock (m_activeConnectionsLock) { int existingConnectionIndex = GetStateObjectIndex(m_activeConnections, request.ISID, request.TSIH, request.CID); if (existingConnectionIndex >= 0) { // Perform implicit logout Log(LogLevel.Information, "[{0}][ProcessPDU] Initiating implicit logout", state.ConnectionIdentifier); SocketUtils.ReleaseSocket(m_activeConnections[existingConnectionIndex].ClientSocket); if (m_activeConnections[existingConnectionIndex].Target != null) { lock (m_activeConnections[existingConnectionIndex].Target.IOLock) { // Wait for pending I/O to complete. } } m_activeConnections.RemoveAt(existingConnectionIndex); Log(LogLevel.Information, "[{0}][ProcessPDU] Implicit logout completed", state.ConnectionIdentifier); } } } LoginResponsePDU response = ServerResponseHelper.GetLoginResponsePDU(request, m_targets, state.SessionParameters, state.ConnectionParameters, ref state.Target, GetNextTSIH); if (state.SessionParameters.IsFullFeaturePhase) { state.SessionParameters.ISID = request.ISID; state.ConnectionParameters.CID = request.CID; lock (m_activeConnectionsLock) { m_activeConnections.Add(state); } } Log(LogLevel.Information, "[{0}][ReceiveCallback] Login Response parameters: {1}", state.ConnectionIdentifier, KeyValuePairUtils.ToString(response.LoginParameters)); TrySendPDU(state, response); } else if (!state.SessionParameters.IsFullFeaturePhase) { // Before the Full Feature Phase is established, only Login Request and Login Response PDUs are allowed. Log(LogLevel.Warning, "[{0}][ProcessPDU] Improper command during login phase, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); // A target receiving any PDU except a Login request before the Login phase is started MUST // immediately terminate the connection on which the PDU was received. // Once the Login phase has started, if the target receives any PDU except a Login request, // it MUST send a Login reject (with Status "invalid during login") and then disconnect. clientSocket.Dispose(); } else // Logged in { if (pdu is TextRequestPDU) { TextRequestPDU request = (TextRequestPDU)pdu; TextResponsePDU response = ServerResponseHelper.GetTextResponsePDU(request, m_targets); TrySendPDU(state, response); } else if (pdu is LogoutRequestPDU) { lock (m_activeConnectionsLock) { int connectionIndex = GetStateObjectIndex(m_activeConnections, state.SessionParameters.ISID, state.SessionParameters.TSIH, state.ConnectionParameters.CID); if (connectionIndex >= 0) { if (m_activeConnections[connectionIndex].Target != null) { lock (m_activeConnections[connectionIndex].Target.IOLock) { // Wait for pending I/O to complete. } } m_activeConnections.RemoveAt(connectionIndex); } } LogoutRequestPDU request = (LogoutRequestPDU)pdu; LogoutResponsePDU response = ServerResponseHelper.GetLogoutResponsePDU(request); TrySendPDU(state, response); clientSocket.Dispose(); // We can close the connection now } else if (state.SessionParameters.IsDiscovery) { // The target MUST ONLY accept text requests with the SendTargets key and a logout // request with the reason "close the session". All other requests MUST be rejected. Log(LogLevel.Warning, "[{0}][ProcessPDU] Improper command during discovery session, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.ProtocolError; reject.Data = ByteReader.ReadBytes(pdu.GetBytes(), 0, 48); TrySendPDU(state, reject); } else if (pdu is NOPOutPDU) { NOPOutPDU request = (NOPOutPDU)pdu; if (request.InitiatorTaskTag != 0xFFFFFFFF) { NOPInPDU response = ServerResponseHelper.GetNOPResponsePDU(request); TrySendPDU(state, response); } } else if (pdu is SCSIDataOutPDU) { // FIXME: the iSCSI target layer MUST deliver the commands for execution (to the SCSI execution engin) in the order specified by CmdSN // e.g. read requests should not be executed while previous write request data is being received (via R2T) SCSIDataOutPDU request = (SCSIDataOutPDU)pdu; Log(LogLevel.Debug, "[{0}][ProcessPDU] SCSIDataOutPDU: Target transfer tag: {1}, LUN: {2}, Buffer offset: {3}, Data segment length: {4}, DataSN: {5}, Final: {6}", state.ConnectionIdentifier, request.TargetTransferTag, (ushort)request.LUN, request.BufferOffset, request.DataSegmentLength, request.DataSN, request.Final); ISCSIPDU response = TargetResponseHelper.GetSCSIDataOutResponsePDU(request, state.Target, state.SessionParameters, state.ConnectionParameters); TrySendPDU(state, response); } else if (pdu is SCSICommandPDU) { SCSICommandPDU command = (SCSICommandPDU)pdu; Log(LogLevel.Debug, "[{0}][ProcessPDU] SCSICommandPDU: CmdSN: {1}, LUN: {2}, Data segment length: {3}, Expected Data Transfer Length: {4}, Final: {5}", state.ConnectionIdentifier, command.CmdSN, (ushort)command.LUN, command.DataSegmentLength, command.ExpectedDataTransferLength, command.Final); List <ISCSIPDU> scsiResponseList = TargetResponseHelper.GetSCSIResponsePDU(command, state.Target, state.SessionParameters, state.ConnectionParameters); foreach (ISCSIPDU response in scsiResponseList) { TrySendPDU(state, response); if (!clientSocket.Connected) { return; } } } else { Log(LogLevel.Warning, "[{0}][ProcessPDU] Unsupported command, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); } } }
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]; } }
private void ProcessConnectionBuffer(ConnectionState state) { Socket clientSocket = state.ClientSocket; ISCSIConnectionReceiveBuffer buffer = state.ReceiveBuffer; while (buffer.HasCompletePDU()) { ISCSIPDU pdu = null; try { pdu = buffer.DequeuePDU(); } catch (Exception ex) { byte[] pduBytes = buffer.DequeuePDUBytes(); Log(Severity.Error, "[{0}] 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); state.SendQueue.Enqueue(reject); } if (pdu != null) { if (pdu.GetType() == typeof(ISCSIPDU)) { Log(Severity.Error, "[{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(pdu.GetBytes(), 0, 48); state.SendQueue.Enqueue(reject); } else { bool valid = ValidateCommandNumbering(pdu, state); if (valid) { ProcessPDU(pdu, state); } else { // We ignore this PDU Log(Severity.Warning, "[{0}] Ignoring PDU with CmdSN outside of expected range", state.ConnectionIdentifier); } } } if (!clientSocket.Connected) { // Do not continue to process the buffer if the other side closed the connection if (buffer.BytesInBuffer > 0) { Log(Severity.Debug, "[{0}] Buffer processing aborted, bytes left in receive buffer: {1}", state.ConnectionIdentifier, buffer.BytesInBuffer); } return; } } }
private ISCSIPDU GetLogoutResponsePDU(LogoutRequestPDU request, ConnectionParameters connection) { Log(Severity.Verbose, "[{0}] Logout Request", connection.ConnectionIdentifier); if (connection.Session.IsDiscovery && request.ReasonCode != LogoutReasonCode.CloseTheSession) { // RFC 3720: Discovery-session: The target MUST ONLY accept [..] logout request with the reason "close the session" RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.ProtocolError; reject.Data = ByteReader.ReadBytes(request.GetBytes(), 0, 48); return(reject); } else { List <ConnectionState> connectionsToClose = new List <ConnectionState>(); if (request.ReasonCode == LogoutReasonCode.CloseTheSession) { connectionsToClose = m_connectionManager.GetSessionConnections(connection.Session); } else if (request.ReasonCode == LogoutReasonCode.CloseTheConnection) { // RFC 3720: A Logout for a CID may be performed on a different transport connection when the TCP connection for the CID has already been terminated. ConnectionState existingConnection = m_connectionManager.FindConnection(connection.Session, request.CID); if (existingConnection != null) { connectionsToClose.Add(existingConnection); } else { return(ServerResponseHelper.GetLogoutResponsePDU(request, LogoutResponse.CIDNotFound)); } } else if (request.ReasonCode == LogoutReasonCode.RemoveTheConnectionForRecovery) { return(ServerResponseHelper.GetLogoutResponsePDU(request, LogoutResponse.ConnectionRecoveryNotSupported)); } else { // Unknown LogoutRequest ReasonCode RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.ProtocolError; reject.Data = ByteReader.ReadBytes(request.GetBytes(), 0, 48); return(reject); } foreach (ConnectionState connectionToClose in connectionsToClose) { // Wait for pending I/O to complete. connectionToClose.RunningSCSICommands.WaitUntilZero(); if (connectionToClose.ConnectionParameters != connection) { SocketUtils.ReleaseSocket(connectionToClose.ClientSocket); } m_connectionManager.RemoveConnection(connectionToClose); } if (request.ReasonCode == LogoutReasonCode.CloseTheSession) { Log(Severity.Verbose, "[{0}] Session has been closed", connection.Session.SessionIdentifier); m_sessionManager.RemoveSession(connection.Session, SessionTerminationReason.Logout); } return(ServerResponseHelper.GetLogoutResponsePDU(request, LogoutResponse.ClosedSuccessfully)); // connection will be closed after a LogoutResponsePDU has been sent. } }
private void ProcessPDU(ISCSIPDU pdu, ConnectionState state) { LogTrace("Entering ProcessPDU"); if (state.Session == null || !state.Session.IsFullFeaturePhase) { if (pdu is LoginRequestPDU) { LoginRequestPDU request = (LoginRequestPDU)pdu; string loginIdentifier = String.Format("ISID={0},TSIH={1},CID={2}", request.ISID.ToString("x"), request.TSIH.ToString("x"), request.CID.ToString("x")); Log(Severity.Verbose, "[{0}] Login Request, current stage: {1}, next stage: {2}, parameters: {3}", loginIdentifier, request.CurrentStage, request.NextStage, FormatNullDelimitedText(request.LoginParametersText)); LoginResponsePDU response = GetLoginResponsePDU(request, state.ConnectionParameters); if (state.Session != null && state.Session.IsFullFeaturePhase) { m_connectionManager.AddConnection(state); } Log(Severity.Verbose, "[{0}] Login Response parameters: {1}", state.ConnectionIdentifier, FormatNullDelimitedText(response.LoginParametersText)); state.SendQueue.Enqueue(response); } else { // Before the Full Feature Phase is established, only Login Request and Login Response PDUs are allowed. Log(Severity.Warning, "[{0}] Initiator error: Improper command during login phase, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); if (state.Session == null) { // A target receiving any PDU except a Login request before the Login phase is started MUST // immediately terminate the connection on which the PDU was received. state.ClientSocket.Close(); } else { // Once the Login phase has started, if the target receives any PDU except a Login request, // it MUST send a Login reject (with Status "invalid during login") and then disconnect. LoginResponsePDU loginResponse = new LoginResponsePDU(); loginResponse.TSIH = state.Session.TSIH; loginResponse.Status = LoginResponseStatusName.InvalidDuringLogon; state.SendQueue.Enqueue(loginResponse); } } } else // Logged in { if (pdu is TextRequestPDU) { TextRequestPDU request = (TextRequestPDU)pdu; TextResponsePDU response = GetTextResponsePDU(request, state.ConnectionParameters); state.SendQueue.Enqueue(response); } else if (pdu is LogoutRequestPDU) { LogoutRequestPDU request = (LogoutRequestPDU)pdu; ISCSIPDU response = GetLogoutResponsePDU(request, state.ConnectionParameters); state.SendQueue.Enqueue(response); } else if (state.Session.IsDiscovery) { // The target MUST ONLY accept text requests with the SendTargets key and a logout // request with the reason "close the session". All other requests MUST be rejected. Log(Severity.Warning, "[{0}] Initiator error: Improper command during discovery session, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.ProtocolError; reject.Data = ByteReader.ReadBytes(pdu.GetBytes(), 0, 48); state.SendQueue.Enqueue(reject); } else if (pdu is NOPOutPDU) { NOPOutPDU request = (NOPOutPDU)pdu; if (request.InitiatorTaskTag != 0xFFFFFFFF) { NOPInPDU response = ServerResponseHelper.GetNOPResponsePDU(request); state.SendQueue.Enqueue(response); } } else if (pdu is SCSIDataOutPDU || pdu is SCSICommandPDU) { // RFC 3720: the iSCSI target layer MUST deliver the commands for execution (to the SCSI execution engine) in the order specified by CmdSN. // e.g. read requests should not be executed while previous write request data is being received (via R2T) List <SCSICommandPDU> commandsToExecute = null; List <ReadyToTransferPDU> readyToTransferPDUs = new List <ReadyToTransferPDU>(); if (pdu is SCSIDataOutPDU) { SCSIDataOutPDU request = (SCSIDataOutPDU)pdu; Log(Severity.Debug, "[{0}] SCSIDataOutPDU: Target transfer tag: {1}, LUN: {2}, Buffer offset: {3}, Data segment length: {4}, DataSN: {5}, Final: {6}", state.ConnectionIdentifier, request.TargetTransferTag, (ushort)request.LUN, request.BufferOffset, request.DataSegmentLength, request.DataSN, request.Final); try { readyToTransferPDUs = TargetResponseHelper.GetReadyToTransferPDUs(request, state.ConnectionParameters, out commandsToExecute); } catch (InvalidTargetTransferTagException ex) { Log(Severity.Warning, "[{0}] Initiator error: Invalid TargetTransferTag: {1}", state.ConnectionIdentifier, ex.TargetTransferTag); RejectPDU reject = new RejectPDU(); reject.InitiatorTaskTag = request.InitiatorTaskTag; reject.Reason = RejectReason.InvalidPDUField; reject.Data = ByteReader.ReadBytes(request.GetBytes(), 0, 48); state.SendQueue.Enqueue(reject); } } else { SCSICommandPDU command = (SCSICommandPDU)pdu; Log(Severity.Debug, "[{0}] SCSICommandPDU: CmdSN: {1}, LUN: {2}, Data segment length: {3}, Expected Data Transfer Length: {4}, Final: {5}", state.ConnectionIdentifier, command.CmdSN, (ushort)command.LUN, command.DataSegmentLength, command.ExpectedDataTransferLength, command.Final); readyToTransferPDUs = TargetResponseHelper.GetReadyToTransferPDUs(command, state.ConnectionParameters, out commandsToExecute); } foreach (ReadyToTransferPDU readyToTransferPDU in readyToTransferPDUs) { state.SendQueue.Enqueue(readyToTransferPDU); } if (commandsToExecute != null) { state.RunningSCSICommands.Add(commandsToExecute.Count); } foreach (SCSICommandPDU commandPDU in commandsToExecute) { Log(Severity.Debug, "[{0}] Queuing command: CmdSN: {1}", state.ConnectionIdentifier, commandPDU.CmdSN); state.Target.QueueCommand(commandPDU.CommandDescriptorBlock, commandPDU.LUN, commandPDU.Data, commandPDU, state.OnCommandCompleted); } } else if (pdu is LoginRequestPDU) { Log(Severity.Warning, "[{0}] Initiator Error: Login request during full feature phase", state.ConnectionIdentifier); // RFC 3720: Login requests and responses MUST be used exclusively during Login. // On any connection, the login phase MUST immediately follow TCP connection establishment and // a subsequent Login Phase MUST NOT occur before tearing down a connection RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.ProtocolError; reject.Data = ByteReader.ReadBytes(pdu.GetBytes(), 0, 48); state.SendQueue.Enqueue(reject); } else { Log(Severity.Error, "[{0}] Unsupported command, OpCode: 0x{1}", state.ConnectionIdentifier, pdu.OpCode.ToString("x")); RejectPDU reject = new RejectPDU(); reject.Reason = RejectReason.CommandNotSupported; reject.Data = ByteReader.ReadBytes(pdu.GetBytes(), 0, 48); state.SendQueue.Enqueue(reject); } } LogTrace("Leaving ProcessPDU"); }