Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SQLTypes / UnsafeNativeMethods.cs / 1305376 / UnsafeNativeMethods.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// [....]
// [....]
// [....]
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Text;
using System.Runtime.InteropServices;
using System.Security;
using Microsoft.Win32.SafeHandles;
using System.Data.Common;
using System.Runtime.Versioning;
namespace System.Data.SqlTypes
{
[SuppressUnmanagedCodeSecurity]
internal static class UnsafeNativeMethods
{
#region PInvoke methods
[DllImport("NtDll.dll", CharSet = CharSet.Unicode)]
[ResourceExposure(ResourceScope.Machine)]
internal static extern UInt32 NtCreateFile
(
out Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle,
Int32 desiredAccess,
ref OBJECT_ATTRIBUTES objectAttributes,
out IO_STATUS_BLOCK ioStatusBlock,
ref Int64 allocationSize,
UInt32 fileAttributes,
System.IO.FileShare shareAccess,
UInt32 createDisposition,
UInt32 createOptions,
SafeHandle eaBuffer,
UInt32 eaLength
);
[DllImport("Kernel32.dll", SetLastError = true)]
[ResourceExposure(ResourceScope.None)]
internal static extern FileType GetFileType
(
Microsoft.Win32.SafeHandles.SafeFileHandle hFile
);
// do not use this PInvoke directly, use SafeGetFullPathName instead
[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
[ResourceExposure(ResourceScope.Machine)]
private static extern int GetFullPathName
(
string path,
int numBufferChars,
StringBuilder buffer,
IntPtr lpFilePartOrNull
);
///
/// safe wrapper for GetFullPathName
/// check that the path length is less than Int16.MaxValue before calling this API!
///
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static string SafeGetFullPathName(string path)
{
Debug.Assert(path != null, "path is null?");
// make sure to test for Int16.MaxValue limit before calling this method
// see the below comment re GetLastWin32Error for the reason
Debug.Assert(path.Length < Int16.MaxValue);
// since we expect network paths, the 'full path' is expected to be the same size
// as the provided one. we still need to allocate +1 for null termination
StringBuilder buffer = new StringBuilder(path.Length + 1);
int cchRequiredSize = GetFullPathName(path, buffer.Capacity, buffer, IntPtr.Zero);
// if our buffer was smaller than required, GetFullPathName will succeed and return us the required buffer size with null
if (cchRequiredSize > buffer.Capacity)
{
// we have to reallocate and retry
buffer.Capacity = cchRequiredSize;
cchRequiredSize = GetFullPathName(path, buffer.Capacity, buffer, IntPtr.Zero);
}
if (cchRequiredSize == 0)
{
// GetFullPathName call failed
int lastError = Marshal.GetLastWin32Error();
if (lastError == 0)
{
// we found that in some cases GetFullPathName fail but does not set the last error value
// for example, it happens when the path provided to it is longer than 32K: return value is 0 (failure)
// but GetLastError was zero too so we raised Win32Exception saying "The operation completed successfully".
// To raise proper "path too long" failure, check the length before calling this API.
// For other (yet unknown cases), we will throw InvalidPath message since we do not know what exactly happened
throw ADP.Argument(Res.GetString(Res.SqlFileStream_InvalidPath), "path");
}
else
{
System.ComponentModel.Win32Exception e = new System.ComponentModel.Win32Exception(lastError);
ADP.TraceExceptionAsReturnValue(e);
throw e;
}
}
// this should not happen since we already reallocate
Debug.Assert(cchRequiredSize <= buffer.Capacity, string.Format(
System.Globalization.CultureInfo.InvariantCulture,
"second call to GetFullPathName returned greater size: {0} > {1}",
cchRequiredSize,
buffer.Capacity));
return buffer.ToString();
}
[DllImport("Kernel32.dll")]
[ResourceExposure(ResourceScope.Process)]
internal static extern uint SetErrorMode
(
uint mode
);
[DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
[ResourceExposure(ResourceScope.Machine)]
internal static extern bool DeviceIoControl
(
Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle,
uint ioControlCode,
IntPtr inBuffer,
uint cbInBuffer,
IntPtr outBuffer,
uint cbOutBuffer,
out uint cbBytesReturned,
IntPtr overlapped
);
[DllImport("NtDll.dll")]
[ResourceExposure(ResourceScope.None)]
internal static extern UInt32 RtlNtStatusToDosError
(
UInt32 status
);
#region definitions from devioctl.h
internal const ushort FILE_DEVICE_FILE_SYSTEM = 0x0009;
internal enum Method
{
METHOD_BUFFERED,
METHOD_IN_DIRECT,
METHOD_OUT_DIRECT,
METHOD_NEITHER
};
internal enum Access
{
FILE_ANY_ACCESS,
FILE_READ_ACCESS,
FILE_WRITE_ACCESS
}
internal static uint CTL_CODE
(
ushort deviceType,
ushort function,
byte method,
byte access
)
{
if ( function > 4095 )
throw ADP.ArgumentOutOfRange ( "function" );
return (uint) ( ( deviceType << 16 ) | ( access << 14 ) | ( function << 2 ) | method );
}
#endregion
#endregion
#region Error codes
internal const int ERROR_INVALID_HANDLE = 6;
internal const int ERROR_MR_MID_NOT_FOUND = 317;
internal const uint STATUS_INVALID_PARAMETER = 0xc000000d;
internal const uint STATUS_SHARING_VIOLATION = 0xc0000043;
internal const uint STATUS_OBJECT_NAME_NOT_FOUND = 0xc0000034;
#endregion
internal const uint SEM_FAILCRITICALERRORS = 0x0001;
internal enum FileType : uint
{
Unknown = 0x0000, // FILE_TYPE_UNKNOWN
Disk = 0x0001, // FILE_TYPE_DISK
Char = 0x0002, // FILE_TYPE_CHAR
Pipe = 0x0003, // FILE_TYPE_PIPE
Remote = 0x8000 // FILE_TYPE_REMOTE
}
#region definitions from wdm.h
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct OBJECT_ATTRIBUTES
{
internal int length;
internal IntPtr rootDirectory;
internal SafeHandle objectName;
internal int attributes;
internal IntPtr securityDescriptor;
internal SafeHandle securityQualityOfService;
}
[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct UNICODE_STRING
{
internal UInt16 length;
internal UInt16 maximumLength;
internal string buffer;
}
// VSTFDevDiv # 547461 [Backport SqlFileStream fix on Win7 to QFE branch]
// Win7 enforces correct values for the _SECURITY_QUALITY_OF_SERVICE.qos member.
// taken from _SECURITY_IMPERSONATION_LEVEL enum definition in winnt.h
internal enum SecurityImpersonationLevel
{
SecurityAnonymous,
SecurityIdentification,
SecurityImpersonation,
SecurityDelegation
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct SECURITY_QUALITY_OF_SERVICE
{
internal UInt32 length;
[MarshalAs(UnmanagedType.I4)]
internal int impersonationLevel;
internal byte contextDynamicTrackingMode;
internal byte effectiveOnly;
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct IO_STATUS_BLOCK
{
internal UInt32 status;
internal IntPtr information;
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct FILE_FULL_EA_INFORMATION
{
internal UInt32 nextEntryOffset;
internal Byte flags;
internal Byte EaNameLength;
internal UInt16 EaValueLength;
internal Byte EaName;
}
[Flags]
internal enum CreateOption : uint
{
FILE_WRITE_THROUGH = 0x00000002,
FILE_SEQUENTIAL_ONLY = 0x00000004,
FILE_NO_INTERMEDIATE_BUFFERING = 0x00000008,
FILE_SYNCHRONOUS_IO_NONALERT = 0x00000020,
FILE_RANDOM_ACCESS = 0x00000800
}
internal enum CreationDisposition : uint
{
FILE_SUPERSEDE = 0,
FILE_OPEN = 1,
FILE_CREATE = 2,
FILE_OPEN_IF = 3,
FILE_OVERWRITE = 4,
FILE_OVERWRITE_IF = 5
}
#endregion
#region definitions from winnt.h
internal const int FILE_READ_DATA = 0x0001;
internal const int FILE_WRITE_DATA = 0x0002;
internal const int FILE_READ_ATTRIBUTES = 0x0080;
internal const int SYNCHRONIZE = 0x00100000;
#endregion
#region definitions from ntdef.h
[Flags]
internal enum Attributes : uint
{
Inherit = 0x00000002,
Permanent = 0x00000010,
Exclusive = 0x00000020,
CaseInsensitive = 0x00000040,
OpenIf = 0x00000080,
OpenLink = 0x00000100,
KernelHandle = 0x00000200,
ForceAccessCheck = 0x00000400,
ValidAttributes = 0x000007F2
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// [....]
// [....]
// [....]
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Text;
using System.Runtime.InteropServices;
using System.Security;
using Microsoft.Win32.SafeHandles;
using System.Data.Common;
using System.Runtime.Versioning;
namespace System.Data.SqlTypes
{
[SuppressUnmanagedCodeSecurity]
internal static class UnsafeNativeMethods
{
#region PInvoke methods
[DllImport("NtDll.dll", CharSet = CharSet.Unicode)]
[ResourceExposure(ResourceScope.Machine)]
internal static extern UInt32 NtCreateFile
(
out Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle,
Int32 desiredAccess,
ref OBJECT_ATTRIBUTES objectAttributes,
out IO_STATUS_BLOCK ioStatusBlock,
ref Int64 allocationSize,
UInt32 fileAttributes,
System.IO.FileShare shareAccess,
UInt32 createDisposition,
UInt32 createOptions,
SafeHandle eaBuffer,
UInt32 eaLength
);
[DllImport("Kernel32.dll", SetLastError = true)]
[ResourceExposure(ResourceScope.None)]
internal static extern FileType GetFileType
(
Microsoft.Win32.SafeHandles.SafeFileHandle hFile
);
// do not use this PInvoke directly, use SafeGetFullPathName instead
[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
[ResourceExposure(ResourceScope.Machine)]
private static extern int GetFullPathName
(
string path,
int numBufferChars,
StringBuilder buffer,
IntPtr lpFilePartOrNull
);
///
/// safe wrapper for GetFullPathName
/// check that the path length is less than Int16.MaxValue before calling this API!
///
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static string SafeGetFullPathName(string path)
{
Debug.Assert(path != null, "path is null?");
// make sure to test for Int16.MaxValue limit before calling this method
// see the below comment re GetLastWin32Error for the reason
Debug.Assert(path.Length < Int16.MaxValue);
// since we expect network paths, the 'full path' is expected to be the same size
// as the provided one. we still need to allocate +1 for null termination
StringBuilder buffer = new StringBuilder(path.Length + 1);
int cchRequiredSize = GetFullPathName(path, buffer.Capacity, buffer, IntPtr.Zero);
// if our buffer was smaller than required, GetFullPathName will succeed and return us the required buffer size with null
if (cchRequiredSize > buffer.Capacity)
{
// we have to reallocate and retry
buffer.Capacity = cchRequiredSize;
cchRequiredSize = GetFullPathName(path, buffer.Capacity, buffer, IntPtr.Zero);
}
if (cchRequiredSize == 0)
{
// GetFullPathName call failed
int lastError = Marshal.GetLastWin32Error();
if (lastError == 0)
{
// we found that in some cases GetFullPathName fail but does not set the last error value
// for example, it happens when the path provided to it is longer than 32K: return value is 0 (failure)
// but GetLastError was zero too so we raised Win32Exception saying "The operation completed successfully".
// To raise proper "path too long" failure, check the length before calling this API.
// For other (yet unknown cases), we will throw InvalidPath message since we do not know what exactly happened
throw ADP.Argument(Res.GetString(Res.SqlFileStream_InvalidPath), "path");
}
else
{
System.ComponentModel.Win32Exception e = new System.ComponentModel.Win32Exception(lastError);
ADP.TraceExceptionAsReturnValue(e);
throw e;
}
}
// this should not happen since we already reallocate
Debug.Assert(cchRequiredSize <= buffer.Capacity, string.Format(
System.Globalization.CultureInfo.InvariantCulture,
"second call to GetFullPathName returned greater size: {0} > {1}",
cchRequiredSize,
buffer.Capacity));
return buffer.ToString();
}
[DllImport("Kernel32.dll")]
[ResourceExposure(ResourceScope.Process)]
internal static extern uint SetErrorMode
(
uint mode
);
[DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
[ResourceExposure(ResourceScope.Machine)]
internal static extern bool DeviceIoControl
(
Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle,
uint ioControlCode,
IntPtr inBuffer,
uint cbInBuffer,
IntPtr outBuffer,
uint cbOutBuffer,
out uint cbBytesReturned,
IntPtr overlapped
);
[DllImport("NtDll.dll")]
[ResourceExposure(ResourceScope.None)]
internal static extern UInt32 RtlNtStatusToDosError
(
UInt32 status
);
#region definitions from devioctl.h
internal const ushort FILE_DEVICE_FILE_SYSTEM = 0x0009;
internal enum Method
{
METHOD_BUFFERED,
METHOD_IN_DIRECT,
METHOD_OUT_DIRECT,
METHOD_NEITHER
};
internal enum Access
{
FILE_ANY_ACCESS,
FILE_READ_ACCESS,
FILE_WRITE_ACCESS
}
internal static uint CTL_CODE
(
ushort deviceType,
ushort function,
byte method,
byte access
)
{
if ( function > 4095 )
throw ADP.ArgumentOutOfRange ( "function" );
return (uint) ( ( deviceType << 16 ) | ( access << 14 ) | ( function << 2 ) | method );
}
#endregion
#endregion
#region Error codes
internal const int ERROR_INVALID_HANDLE = 6;
internal const int ERROR_MR_MID_NOT_FOUND = 317;
internal const uint STATUS_INVALID_PARAMETER = 0xc000000d;
internal const uint STATUS_SHARING_VIOLATION = 0xc0000043;
internal const uint STATUS_OBJECT_NAME_NOT_FOUND = 0xc0000034;
#endregion
internal const uint SEM_FAILCRITICALERRORS = 0x0001;
internal enum FileType : uint
{
Unknown = 0x0000, // FILE_TYPE_UNKNOWN
Disk = 0x0001, // FILE_TYPE_DISK
Char = 0x0002, // FILE_TYPE_CHAR
Pipe = 0x0003, // FILE_TYPE_PIPE
Remote = 0x8000 // FILE_TYPE_REMOTE
}
#region definitions from wdm.h
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct OBJECT_ATTRIBUTES
{
internal int length;
internal IntPtr rootDirectory;
internal SafeHandle objectName;
internal int attributes;
internal IntPtr securityDescriptor;
internal SafeHandle securityQualityOfService;
}
[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct UNICODE_STRING
{
internal UInt16 length;
internal UInt16 maximumLength;
internal string buffer;
}
// VSTFDevDiv # 547461 [Backport SqlFileStream fix on Win7 to QFE branch]
// Win7 enforces correct values for the _SECURITY_QUALITY_OF_SERVICE.qos member.
// taken from _SECURITY_IMPERSONATION_LEVEL enum definition in winnt.h
internal enum SecurityImpersonationLevel
{
SecurityAnonymous,
SecurityIdentification,
SecurityImpersonation,
SecurityDelegation
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct SECURITY_QUALITY_OF_SERVICE
{
internal UInt32 length;
[MarshalAs(UnmanagedType.I4)]
internal int impersonationLevel;
internal byte contextDynamicTrackingMode;
internal byte effectiveOnly;
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct IO_STATUS_BLOCK
{
internal UInt32 status;
internal IntPtr information;
}
[StructLayoutAttribute(LayoutKind.Sequential)]
internal struct FILE_FULL_EA_INFORMATION
{
internal UInt32 nextEntryOffset;
internal Byte flags;
internal Byte EaNameLength;
internal UInt16 EaValueLength;
internal Byte EaName;
}
[Flags]
internal enum CreateOption : uint
{
FILE_WRITE_THROUGH = 0x00000002,
FILE_SEQUENTIAL_ONLY = 0x00000004,
FILE_NO_INTERMEDIATE_BUFFERING = 0x00000008,
FILE_SYNCHRONOUS_IO_NONALERT = 0x00000020,
FILE_RANDOM_ACCESS = 0x00000800
}
internal enum CreationDisposition : uint
{
FILE_SUPERSEDE = 0,
FILE_OPEN = 1,
FILE_CREATE = 2,
FILE_OPEN_IF = 3,
FILE_OVERWRITE = 4,
FILE_OVERWRITE_IF = 5
}
#endregion
#region definitions from winnt.h
internal const int FILE_READ_DATA = 0x0001;
internal const int FILE_WRITE_DATA = 0x0002;
internal const int FILE_READ_ATTRIBUTES = 0x0080;
internal const int SYNCHRONIZE = 0x00100000;
#endregion
#region definitions from ntdef.h
[Flags]
internal enum Attributes : uint
{
Inherit = 0x00000002,
Permanent = 0x00000010,
Exclusive = 0x00000020,
CaseInsensitive = 0x00000040,
OpenIf = 0x00000080,
OpenLink = 0x00000100,
KernelHandle = 0x00000200,
ForceAccessCheck = 0x00000400,
ValidAttributes = 0x000007F2
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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