public SCSIStatusCodeName Write(SCSICommandDescriptorBlock command, LUNStructure lun, byte[] data, out byte[] response)
{
Disk disk = m_disks[lun];
if (disk.IsReadOnly)
{
Log(Severity.Verbose, "LUN {0}: Refused attempt to write to a read-only disk", lun);
SenseDataParameter senseData = SenseDataParameter.GetDataProtectSenseData();
response = senseData.GetBytes();
return(SCSIStatusCodeName.CheckCondition);
}
Log(Severity.Verbose, "LUN {0}: Writing {1} blocks starting from LBA {2}", (ushort)lun, command.TransferLength, (long)command.LogicalBlockAddress64);
try
{
disk.WriteSectors((long)command.LogicalBlockAddress64, data);
response = new byte[0];
return(SCSIStatusCodeName.Good);
}
catch (ArgumentOutOfRangeException)
{
Log(Severity.Error, "Write error: LBA out of range");
response = FormatSenseData(SenseDataParameter.GetIllegalRequestLBAOutOfRangeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
catch (IOException ex)
{
Log(Severity.Error, "Write error: {0}", ex.ToString());
response = FormatSenseData(SenseDataParameter.GetMediumErrorWriteFaultSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
public SCSIStatusCodeName Read(SCSICommandDescriptorBlock command, LUNStructure lun, out byte[] response)
{
Disk disk = m_disks[lun];
int sectorCount = (int)command.TransferLength;
Log(Severity.Verbose, "LUN {0}: Reading {1} blocks starting from LBA {2}", (ushort)lun, sectorCount, (long)command.LogicalBlockAddress64);
try
{
response = disk.ReadSectors((long)command.LogicalBlockAddress64, sectorCount);
return(SCSIStatusCodeName.Good);
}
catch (ArgumentOutOfRangeException)
{
Log(Severity.Error, "Read error: LBA out of range");
response = FormatSenseData(SenseDataParameter.GetIllegalRequestLBAOutOfRangeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
catch (CyclicRedundancyCheckException)
{
Log(Severity.Error, "Read error: CRC error");
response = FormatSenseData(SenseDataParameter.GetWriteFaultSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
catch (IOException ex)
{
Log(Severity.Error, "Read error: {0}", ex.ToString());
response = FormatSenseData(SenseDataParameter.GetMediumErrorUnrecoverableReadErrorSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
public static byte[] FormatSenseData(SenseDataParameter senseData)
{
byte[] senseDataBytes = senseData.GetBytes();
byte[] result = new byte[senseDataBytes.Length + 2];
BigEndianWriter.WriteUInt16(result, 0, (ushort)senseDataBytes.Length);
ByteWriter.WriteBytes(result, 2, senseDataBytes);
return(result);
}
// Some initiators (i.e. EFI iSCSI DXE) will send 'Request Sense' upon connection (likely just to verify the medium is ready)
public SCSIStatusCodeName RequestSense(LUNStructure lun, uint allocationLength, out byte[] response)
{
response = FormatSenseData(SenseDataParameter.GetNoSenseSenseData());
// we must not return more bytes than RequestSense.AllocationLength
if (response.Length > allocationLength)
{
response = ByteReader.ReadBytes(response, 0, (int)allocationLength);
}
return(SCSIStatusCodeName.Good);
}
public static SenseDataParameter GetNoSenseSenseData()
{
SenseDataParameter senseData = new SenseDataParameter();
senseData.Valid = true;
senseData.ResponseCode = 0x70; // current errors
senseData.SenseKey = 0x00; // NO SENSE
senseData.AdditionalSenseCode = 0x00; // No Additional Sense Information
return(senseData);
}
public static SenseDataParameter GetIllegalRequestSenseData(byte additionalSenseCode, byte additionalSenseCodeQualifier)
{
SenseDataParameter senseData = new SenseDataParameter();
senseData.Valid = true;
senseData.ResponseCode = 0x70; // current errors
senseData.SenseKey = 0x05; // ILLEGAL REQUEST
senseData.AdditionalSenseCode = additionalSenseCode;
senseData.AdditionalSenseCodeQualifier = additionalSenseCodeQualifier;
return(senseData);
}
public static SenseDataParameter GetDataProtectSenseData()
{
SenseDataParameter senseData = new SenseDataParameter();
senseData.Valid = true;
senseData.ResponseCode = 0x70; // current errors
senseData.SenseKey = 0x07; // DATA PROTECT
senseData.AdditionalSenseCode = 0x27; // Command not allowed
senseData.AdditionalSenseCodeQualifier = 0x00;
return(senseData);
}
/// <summary>
/// Reported when CRC error is encountered
/// </summary>
public static SenseDataParameter GetWriteFaultSenseData()
{
SenseDataParameter senseData = new SenseDataParameter();
senseData.Valid = true;
senseData.ResponseCode = 0x70; // current errors
senseData.SenseKey = 0x03; // MEDIUM ERROR
senseData.AdditionalSenseCode = 0x03; // Peripheral Device Write Fault
senseData.AdditionalSenseCodeQualifier = 0x00;
return(senseData);
}
/// <summary>
/// This implementation is not thread-safe.
/// </summary>
public override SCSIStatusCodeName ExecuteCommand(byte[] commandBytes, LUNStructure lun, byte[] data, out byte[] response)
{
SCSICommandDescriptorBlock command;
try
{
command = SCSICommandDescriptorBlock.FromBytes(commandBytes, 0);
}
catch (UnsupportedSCSICommandException)
{
Log(Severity.Error, "Unsupported SCSI Command (0x{0})", commandBytes[0].ToString("X"));
response = FormatSenseData(SenseDataParameter.GetIllegalRequestUnsupportedCommandCodeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
return(ExecuteCommand(command, lun, data, out response));
}
/// <summary>
/// This implementation is not thread-safe.
/// </summary>
public SCSIStatusCodeName ExecuteCommand(SCSICommandDescriptorBlock command, LUNStructure lun, byte[] data, out byte[] response)
{
Log(Severity.Verbose, "Executing command: {0}", command.OpCode);
if (command.OpCode == SCSIOpCodeName.ReportLUNs)
{
uint allocationLength = command.TransferLength;
return(ReportLUNs(allocationLength, out response));
}
else if (lun >= m_disks.Count)
{
Log(Severity.Warning, "Initiator error: tried to execute command on LUN {0} which does not exist", lun);
response = FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidLUNSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
else if (command.OpCode == SCSIOpCodeName.TestUnitReady)
{
return(TestUnitReady(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.RequestSense)
{
uint allocationLength = command.TransferLength;
return(RequestSense(lun, allocationLength, out response));
}
else if (command.OpCode == SCSIOpCodeName.Inquiry)
{
return(Inquiry((InquiryCommand)command, lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.Reserve6)
{
return(Reserve6(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.Release6)
{
return(Release6(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.ModeSense6)
{
return(ModeSense6((ModeSense6CommandDescriptorBlock)command, lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.ReadCapacity10)
{
return(ReadCapacity10(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.Read6 ||
command.OpCode == SCSIOpCodeName.Read10 ||
command.OpCode == SCSIOpCodeName.Read16)
{
return(Read(command, lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.Write6 ||
command.OpCode == SCSIOpCodeName.Write10 ||
command.OpCode == SCSIOpCodeName.Write16)
{
return(Write(command, lun, data, out response));
}
else if (command.OpCode == SCSIOpCodeName.Verify10 ||
command.OpCode == SCSIOpCodeName.Verify16)
{
return(Verify(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.SynchronizeCache10)
{
return(SynchronizeCache10(lun, out response));
}
else if (command.OpCode == SCSIOpCodeName.ServiceActionIn16 &&
command.ServiceAction == ServiceAction.ReadCapacity16)
{
uint allocationLength = command.TransferLength;
return(ReadCapacity16(lun, allocationLength, out response));
}
else
{
Log(Severity.Error, "Unsupported SCSI Command (0x{0})", command.OpCode.ToString("X"));
response = FormatSenseData(SenseDataParameter.GetIllegalRequestUnsupportedCommandCodeSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
public SCSIStatusCodeName ModeSense6(ModeSense6CommandDescriptorBlock command, LUNStructure lun, out byte[] response)
{
Log(Severity.Verbose, "ModeSense6: Page code: 0x{0}, Sub page code: 0x{1}", command.PageCode.ToString("X"), command.SubpageCode.ToString("X"));
byte[] pageData;
switch ((ModePageCodeName)command.PageCode)
{
case ModePageCodeName.CachingParametersPage:
{
CachingParametersPage page = new CachingParametersPage();
page.RCD = true;
pageData = page.GetBytes();
break;
}
case ModePageCodeName.ControlModePage:
{
ControlModePage page = new ControlModePage();
pageData = page.GetBytes();
break;
}
case ModePageCodeName.PowerConditionModePage:
{
if (command.SubpageCode == 0x00)
{
PowerConditionModePage page = new PowerConditionModePage();
pageData = page.GetBytes();
break;
}
else if (command.SubpageCode == 0x01)
{
PowerConsumptionModePage page = new PowerConsumptionModePage();
pageData = page.GetBytes();
break;
}
else
{
Log(Severity.Error, "ModeSense6: Power condition subpage 0x{0} is not implemented", command.SubpageCode.ToString("x"));
response = FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidFieldInCDBSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
case ModePageCodeName.InformationalExceptionsControlModePage:
{
InformationalExceptionsControlModePage page = new InformationalExceptionsControlModePage();
pageData = page.GetBytes();
break;
}
case ModePageCodeName.ReturnAllPages:
{
CachingParametersPage page1 = new CachingParametersPage();
page1.RCD = true;
InformationalExceptionsControlModePage page2 = new InformationalExceptionsControlModePage();
pageData = new byte[page1.Length + page2.Length];
Array.Copy(page1.GetBytes(), pageData, page1.Length);
Array.Copy(page2.GetBytes(), 0, pageData, page1.Length, page2.Length);
break;
}
case ModePageCodeName.VendorSpecificPage:
{
// Windows 2000 will request this page, we immitate Microsoft iSCSI Target by sending back an empty page
VendorSpecificPage page = new VendorSpecificPage();
pageData = page.GetBytes();
break;
}
default:
{
Log(Severity.Error, "ModeSense6: ModeSense6 page 0x{0} is not implemented", command.PageCode.ToString("x"));
response = FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidFieldInCDBSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
ModeParameterHeader6 header = new ModeParameterHeader6();
header.WP = m_disks[lun].IsReadOnly; // Write protected, even when set to true, Windows does not always prevent the disk from being written to.
header.DPOFUA = true; // Microsoft iSCSI Target support this
byte[] descriptorBytes = new byte[0];
if (!command.DBD)
{
ShortLBAModeParameterBlockDescriptor descriptor = new ShortLBAModeParameterBlockDescriptor();
descriptor.LogicalBlockLength = (uint)m_disks[lun].BytesPerSector;
descriptorBytes = descriptor.GetBytes();
}
header.BlockDescriptorLength = (byte)descriptorBytes.Length;
header.ModeDataLength += (byte)(descriptorBytes.Length + pageData.Length);
response = new byte[1 + header.ModeDataLength];
Array.Copy(header.GetBytes(), 0, response, 0, header.Length);
Array.Copy(descriptorBytes, 0, response, header.Length, descriptorBytes.Length);
Array.Copy(pageData, 0, response, header.Length + descriptorBytes.Length, pageData.Length);
// we must not return more bytes than ModeSense6Command.AllocationLength
if (response.Length > command.AllocationLength)
{
response = ByteReader.ReadBytes(response, 0, command.AllocationLength);
}
return(SCSIStatusCodeName.Good);
}
public SCSIStatusCodeName Inquiry(InquiryCommand command, LUNStructure lun, out byte[] response)
{
if (!command.EVPD)
{
if ((int)command.PageCode == 0)
{
StandardInquiryData inquiryData = new StandardInquiryData();
inquiryData.PeripheralDeviceType = 0; // Direct access block device
inquiryData.VendorIdentification = "TalAloni";
inquiryData.ProductIdentification = "SCSI Disk " + ((ushort)lun).ToString();
inquiryData.ProductRevisionLevel = "1.00";
inquiryData.DriveSerialNumber = 0;
inquiryData.CmdQue = true;
inquiryData.Version = 5; // SPC-3
NotifyStandardInquiry(this, new StandardInquiryEventArgs(lun, inquiryData));
response = inquiryData.GetBytes();
}
else
{
Log(Severity.Warning, "Initiator error: Invalid Inquiry request");
response = FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidFieldInCDBSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
else
{
Log(Severity.Verbose, "Inquiry: Page code: 0x{0}", command.PageCode.ToString("X"));
switch (command.PageCode)
{
case VitalProductDataPageName.SupportedVPDPages:
{
SupportedVitaLProductDataPages page = new SupportedVitaLProductDataPages();
page.SupportedPageList.Add((byte)VitalProductDataPageName.SupportedVPDPages);
page.SupportedPageList.Add((byte)VitalProductDataPageName.UnitSerialNumber);
page.SupportedPageList.Add((byte)VitalProductDataPageName.DeviceIdentification);
response = page.GetBytes();
break;
}
case VitalProductDataPageName.UnitSerialNumber:
{
UnitSerialNumberVPDPage page = new UnitSerialNumberVPDPage();
// Older products that only support the Product Serial Number parameter will have a page length of 08h, while newer products that support both parameters (Vendor Unique field from the StandardInquiryData) will have a page length of 14h
// Microsoft iSCSI Target uses values such as "34E5A6FC-3ACC-452D-AEDA-6EE2EFF20FB4"
ulong serialNumber = 0;
page.ProductSerialNumber = serialNumber.ToString("00000000");
NotifyUnitSerialNumberInquiry(this, new UnitSerialNumberInquiryEventArgs(lun, page));
response = page.GetBytes();
break;
}
case VitalProductDataPageName.DeviceIdentification:
{
DeviceIdentificationVPDPage page = new DeviceIdentificationVPDPage();
// NAA identifier is needed to prevent 0xF4 BSOD during Windows setup
page.IdentificationDescriptorList.Add(IdentificationDescriptor.GetNAAExtendedIdentifier(5, lun));
NotifyDeviceIdentificationInquiry(this, new DeviceIdentificationInquiryEventArgs(lun, page));
response = page.GetBytes();
break;
}
case VitalProductDataPageName.BlockLimits:
{
/* Provide only when requeste explicitly */
BlockLimitsVPDPage page = new BlockLimitsVPDPage();
page.OptimalTransferLengthGranularity = 128;
page.MaximumTransferLength = (uint)DiskAccessLibrary.Settings.MaximumTransferSizeLBA;
page.OptimalTransferLength = 128;
response = page.GetBytes();
break;
}
case VitalProductDataPageName.BlockDeviceCharacteristics:
{
/* Provide only when requeste explicitly */
BlockDeviceCharacteristicsVPDPage page = new BlockDeviceCharacteristicsVPDPage();
page.MediumRotationRate = 0; // Not reported
response = page.GetBytes();
break;
}
default:
{
Log(Severity.Error, "Inquiry: Unsupported VPD Page request (0x{0})", command.PageCode.ToString("X"));
response = FormatSenseData(SenseDataParameter.GetIllegalRequestInvalidFieldInCDBSenseData());
return(SCSIStatusCodeName.CheckCondition);
}
}
}
// we must not return more bytes than InquiryCommand.AllocationLength
if (response.Length > command.AllocationLength)
{
response = ByteReader.ReadBytes(response, 0, command.AllocationLength);
}
return(SCSIStatusCodeName.Good);
}
