private SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER BuildSCSIPassThroughStructure(byte[] commandBytes, LogicalUnit logicalUnit, byte[] data)
{
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER scsi = null;
scsi = new SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER();
scsi.Spt.Length = (ushort)Marshal.SizeOf(scsi.Spt);
scsi.Spt.PathId = logicalUnit.PathId;
scsi.Spt.TargetId = logicalUnit.TargetId;
scsi.Spt.Lun = logicalUnit.TargetLun;
scsi.Spt.CdbLength = (byte)commandBytes.Length;
scsi.Spt.Cdb = commandBytes;
if (data != null && data.Length > 0)
{
// DATA OUT (from initiator to target, WRITE)
scsi.Spt.DataIn = (byte)SCSIDataDirection.Out;
scsi.Spt.DataTransferLength = (uint)data.Length;
scsi.Spt.DataBuffer = Marshal.AllocHGlobal((int)scsi.Spt.DataTransferLength);
Marshal.Copy(data, 0, scsi.Spt.DataBuffer, data.Length);
}
else
{
// DATA IN (to initiator from target, READ)
scsi.Spt.DataIn = (byte)SCSICommandParser.GetDataDirection(commandBytes);
if ((SCSIDataDirection)scsi.Spt.DataIn == SCSIDataDirection.In)
{
scsi.Spt.DataTransferLength = GetDataInTransferLength(commandBytes, logicalUnit);
scsi.Spt.DataBuffer = Marshal.AllocHGlobal((int)scsi.Spt.DataTransferLength);
}
else
{
scsi.Spt.DataTransferLength = 0; // No data!
scsi.Spt.DataBuffer = IntPtr.Zero;
}
}
Log(Severity.Verbose, "SCSI Command: {0}, Data Length: {1}, Transfer Direction: {2}, Transfer Length: {3}, LUN: {4}", (SCSIOpCodeName)commandBytes[0], data.Length, (SCSIDataDirection)scsi.Spt.DataIn, scsi.Spt.DataTransferLength, logicalUnit.AssociatedLun);
scsi.Spt.TimeOutValue = SCSI_TIMEOUT;
scsi.Spt.SenseInfoOffset = (uint)Marshal.OffsetOf(typeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER), "Sense");
scsi.Spt.SenseInfoLength = (byte)scsi.Sense.Length;
return(scsi);
}
/// <summary>
/// This takes the iSCSI command and forwards it to a SCSI Passthrough device. It then returns the response.
/// </summary>
public override SCSIStatusCodeName ExecuteCommand(byte[] commandBytes, LUNStructure lun, byte[] data, out byte[] response)
{
// SPTI only supports up to 16 byte CDBs
if (commandBytes.Length > SCSI_PASS_THROUGH_DIRECT.CdbBufferLength)
{
response = VirtualSCSITarget.FormatSenseData(SenseDataParameter.GetIllegalRequestUnsupportedCommandCodeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
if (commandBytes[0] == (byte)SCSIOpCodeName.ReportLUNs)
{
if (m_emulateReportLUNs)
{
Log(Severity.Verbose, "SCSI Command: ReportLUNs");
ReportLUNsParameter parameter = new ReportLUNsParameter();
parameter.LUNList.Add(0);
response = parameter.GetBytes();
if (m_logicalUnitManager.FindLogicalUnit(0) == null)
{
m_logicalUnitManager.AddLogicalUnit(new LogicalUnit());
}
return(SCSIStatusCodeName.Good);
}
else
{
return(ReportLUNs(out response));
}
}
LogicalUnit logicalUnit = m_logicalUnitManager.FindLogicalUnit((byte)lun);
if (logicalUnit == null)
{
response = VirtualSCSITarget.FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidLUNSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
// Pad all CDBs to 16 bytes
Array.Resize(ref commandBytes, SCSI_PASS_THROUGH_DIRECT.CdbBufferLength);
// Build SCSI Passthrough structure
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER scsi = BuildSCSIPassThroughStructure(commandBytes, logicalUnit, data);
if (scsi == null)
{
response = VirtualSCSITarget.FormatSenseData(SenseDataParameter.GetIllegalRequestUnsupportedCommandCodeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
uint bytesReturned;
IntPtr inBuffer = inBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(scsi));
uint size = (uint)Marshal.SizeOf(scsi);
Marshal.StructureToPtr(scsi, inBuffer, true);
// Forward SCSI command to target
SCSIStatusCodeName status;
if (!DeviceIoControl(m_handle, IOCTL_SCSI_PASS_THROUGH_DIRECT, inBuffer, size, IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero))
{
// Notes:
// 1. DeviceIoControl will return ERROR_INVALID_HANDLE under Windows Vista or later if not running as administrator.
// 2. If a device class driver has claimed the device then passthrough IOCTLs must go through the device class driver.
// Sending IOCTLs to the port driver will return ERROR_INVALID_FUNCTION in such cases.
// To work with an HBA one can disable the disk drivers of disks connected to that HBA.
Win32Error lastError = (Win32Error)Marshal.GetLastWin32Error();
Log(Severity.Error, "DeviceIoControl/IOCTL_SCSI_PASS_THROUGH_DIRECT error: {0}, Device path: {1}", lastError, m_path);
response = VirtualSCSITarget.FormatSenseData(SenseDataParameter.GetIllegalRequestUnsupportedCommandCodeSenseData());
status = SCSIStatusCodeName.CheckCondition;
}
else
{
Marshal.PtrToStructure(inBuffer, scsi);
status = (SCSIStatusCodeName)scsi.Spt.ScsiStatus;
if (status != SCSIStatusCodeName.Good)
{
Log(Severity.Verbose, "SCSI Status: {0}, Sense: {1}", status, BitConverter.ToString(scsi.Sense));
response = new byte[scsi.Sense.Length + 2];
BigEndianWriter.WriteUInt16(response, 0, (ushort)scsi.Sense.Length);
ByteWriter.WriteBytes(response, 2, scsi.Sense);
}
else
{
if (scsi.Spt.DataTransferLength > 0)
{
if (scsi.Spt.DataIn == (byte)SCSIDataDirection.In)
{
response = new byte[scsi.Spt.DataTransferLength];
Marshal.Copy(scsi.Spt.DataBuffer, response, 0, response.Length);
}
else
{
response = new byte[0];
}
Log(Severity.Verbose, "SCSI Status: {0}, Response Length: {1}", status, response.Length);
if (commandBytes[0] == (byte)SCSIOpCodeName.Inquiry)
{
InterceptInquiry(logicalUnit, commandBytes, response);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ModeSelect6)
{
InterceptModeSelect6(logicalUnit, commandBytes, data);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ModeSense6)
{
InterceptModeSense6(logicalUnit, commandBytes, response);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ReadCapacity10)
{
InterceptReadCapacity10(logicalUnit, commandBytes, response);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ModeSelect10)
{
InterceptModeSelect10(logicalUnit, commandBytes, data);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ModeSense10)
{
InterceptModeSense10(logicalUnit, commandBytes, response);
}
else if (commandBytes[0] == (byte)SCSIOpCodeName.ServiceActionIn16 && commandBytes[1] == (byte)ServiceAction.ReadCapacity16)
{
InterceptReadCapacity16(logicalUnit, commandBytes, response);
}
}
else
{
// SPTI request was GOOD, no data in response buffer.
response = new byte[0];
Log(Severity.Verbose, "SCSI Status: {0}", status);
}
}
}
Marshal.FreeHGlobal(inBuffer);
if (scsi.Spt.DataBuffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(scsi.Spt.DataBuffer);
}
return(status);
}
