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December 21, 2017 21:08
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| function Get-Doppelgangers | |
| { | |
| <# | |
| .SYNOPSIS | |
| Detects use of NTFS transactions for stealth/evasion, aka 'Process Doppelganging' | |
| Author: Joe Desimone (@dez_) | |
| License: BSD 3-Clause | |
| .DESCRIPTION | |
| Scans all processes for memory sections that are MEM_IMAGE but return ERROR_TRANSACTION_NOT_ACTIVE | |
| when querying the associated section file name object. This is typical for sections that are | |
| associated with rolled back transactions. | |
| .EXAMPLE | |
| Get-Doppelgangers -verbose | |
| #> | |
| [CmdletBinding()] | |
| Param | |
| ( | |
| [Parameter(Position = 0)] | |
| [ValidateNotNullOrEmpty()] | |
| [String] | |
| $OutPath = $PWD.Path | |
| ) | |
| $Mod = New-InMemoryModule -ModuleName Win32 | |
| $MemoryBasicInformation = struct $Mod Mem.MEMORY_BASIC_INFORMATION @{ | |
| BaseAddress = field 0 IntPtr | |
| AllocationBase = field 1 IntPtr | |
| AllocationProtect = field 2 UInt32 | |
| RegionSize = field 3 IntPtr | |
| State = field 4 UInt32 | |
| Protect = field 5 UInt32 | |
| Type = field 6 UInt32 | |
| } | |
| $FunctionDefinitions = @( | |
| (func kernel32 OpenProcess ([UInt32]) @([UInt32], [UInt32], [UInt32]) -SetLastError), | |
| (func kernel32 CloseHandle ([UInt32]) @([UInt32]) -SetLastError), | |
| (func kernel32 VirtualQueryEx ([IntPtr]) @([IntPtr], [IntPtr], $MemoryBasicInformation.MakeByRefType(), [IntPtr]) -SetLastError), | |
| (func kernel32 ReadProcessMemory ([UInt32]) @([UInt32], [IntPtr], [Byte[]], [IntPtr], [IntPtr].MakeByRefType()) -SetLastError), | |
| (func kernel32 K32GetMappedFileName ([UInt32]) @([UInt32], [IntPtr], [Byte[]], [UInt32]) -SetLastError) | |
| ) | |
| $Types = $FunctionDefinitions | Add-Win32Type -Module $Mod -Namespace 'Win32' | |
| $Kernel32 = $Types['kernel32'] | |
| $processList = Get-Process | |
| foreach ($process in $processList) | |
| { | |
| $id = $process | select id | |
| $processId = $id.id | |
| $processHandle = $Kernel32::OpenProcess(0x0400 -bxor 0x0010, 0, $processId) | |
| if ($processHandle -ne 0) | |
| { | |
| #"PID: $processId, Handle: $processHandle" | |
| $mbi = [Activator]::CreateInstance($MemoryBasicInformation) | |
| while(1) | |
| { | |
| $retSz = 0 | |
| $val = [System.IntPtr]::Size | |
| $pAddr = [Int64]$mbi.BaseAddress + $mbi.RegionSize | |
| $pAddr = [IntPtr]$pAddr | |
| $retSz = $Kernel32::VirtualQueryEx($processHandle, $pAddr, [ref]$mbi, $MemoryBasicInformation::GetSize()) | |
| if ($retSz -eq 0) | |
| { | |
| break | |
| } | |
| if($mbi.Type -eq 0x01000000 -and $mbi.State -eq 0x1000) | |
| { | |
| $fileBuf = New-Object byte[](1024) | |
| $retSz = $Kernel32::K32GetMappedFileName($processHandle, $mbi.BaseAddress, $fileBuf, $fileBuf.Length);$LastError = [ComponentModel.Win32Exception][Runtime.InteropServices.Marshal]::GetLastWin32Error() | |
| $fileName = [System.Text.Encoding]::UNICODE.GetString($fileBuf) | |
| if($retSz -eq 0 -and $LastError.NativeErrorCode -eq 6701) | |
| { | |
| Write-Verbose ("Hit: {0} [pid {1:d}], 0x{2:x} - 0x{3:x} (size: 0x{4:x})" -f $process.ProcessName, | |
| $processId, [Int64]$mbi.BaseAddress, ([Int64]$mbi.BaseAddress+$mbi.RegionSize), [Int64]$mbi.RegionSize) | |
| [IntPtr]$szRead = 0 | |
| $buf = New-Object byte[]($mbi.RegionSize) | |
| $bRet = $Kernel32::ReadProcessMemory($processHandle, $mbi.BaseAddress, $buf, $buf.Length, [ref]$szRead) | |
| if($bRet -eq 1) | |
| { | |
| Save-Data $process.ProcessName $buf $mbi.AllocationBase $OutPath | |
| } | |
| } | |
| } | |
| } | |
| $bRet = $Kernel32::CloseHandle($processHandle) | |
| } | |
| } | |
| Write-Verbose ("Scanned {0:d} processes" -f $processList.Length) | |
| } | |
| function Save-Data | |
| { | |
| Param | |
| ( | |
| [Parameter(Position = 0, Mandatory = $True)] | |
| [String] | |
| $ProcessName, | |
| [Parameter(Position = 1, Mandatory = $True)] | |
| [Byte[]] | |
| $buffer, | |
| [Parameter(Position = 2, Mandatory = $True)] | |
| [IntPtr] | |
| $base, | |
| [Parameter(Position = 3, Mandatory = $True)] | |
| [String] | |
| $Path | |
| ) | |
| New-Item -ItemType directory -force -Path $Path | |
| $file_path = "{0}\{1}_{2:x}" -f $Path, $ProcessName, [Int64]$base | |
| if (Test-Path $file_path) | |
| { | |
| # =( | |
| $existing = [io.file]::ReadAllBytes($file_path) | |
| $all = New-Object byte[]($buffer.length + $existing.length) | |
| $all = $existing + $buffer | |
| [io.file]::WriteAllBytes($file_path,$all) | |
| } | |
| else | |
| { | |
| [io.file]::WriteAllBytes($file_path,$buffer) | |
| } | |
| Get-Item $file_path | |
| } | |
| #region PSReflect | |
| function New-InMemoryModule | |
| { | |
| <# | |
| .SYNOPSIS | |
| Creates an in-memory assembly and module | |
| Author: Matthew Graeber (@mattifestation) | |
| License: BSD 3-Clause | |
| Required Dependencies: None | |
| Optional Dependencies: None | |
| .DESCRIPTION | |
| When defining custom enums, structs, and unmanaged functions, it is | |
| necessary to associate to an assembly module. This helper function | |
| creates an in-memory module that can be passed to the 'enum', | |
| 'struct', and Add-Win32Type functions. | |
| .PARAMETER ModuleName | |
| Specifies the desired name for the in-memory assembly and module. If | |
| ModuleName is not provided, it will default to a GUID. | |
| .EXAMPLE | |
| $Module = New-InMemoryModule -ModuleName Win32 | |
| #> | |
| Param | |
| ( | |
| [Parameter(Position = 0)] | |
| [ValidateNotNullOrEmpty()] | |
| [String] | |
| $ModuleName = [Guid]::NewGuid().ToString() | |
| ) | |
| $AppDomain = [Reflection.Assembly].Assembly.GetType('System.AppDomain').GetProperty('CurrentDomain').GetValue($null, @()) | |
| $LoadedAssemblies = $AppDomain.GetAssemblies() | |
| foreach ($Assembly in $LoadedAssemblies) { | |
| if ($Assembly.FullName -and ($Assembly.FullName.Split(',')[0] -eq $ModuleName)) { | |
| return $Assembly | |
| } | |
| } | |
| $DynAssembly = New-Object Reflection.AssemblyName($ModuleName) | |
| $Domain = $AppDomain | |
| $AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, 'Run') | |
| $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule($ModuleName, $False) | |
| return $ModuleBuilder | |
| } | |
| # A helper function used to reduce typing while defining function | |
| # prototypes for Add-Win32Type. | |
| function func | |
| { | |
| Param | |
| ( | |
| [Parameter(Position = 0, Mandatory = $True)] | |
| [String] | |
| $DllName, | |
| [Parameter(Position = 1, Mandatory = $True)] | |
| [string] | |
| $FunctionName, | |
| [Parameter(Position = 2, Mandatory = $True)] | |
| [Type] | |
| $ReturnType, | |
| [Parameter(Position = 3)] | |
| [Type[]] | |
| $ParameterTypes, | |
| [Parameter(Position = 4)] | |
| [Runtime.InteropServices.CallingConvention] | |
| $NativeCallingConvention, | |
| [Parameter(Position = 5)] | |
| [Runtime.InteropServices.CharSet] | |
| $Charset, | |
| [String] | |
| $EntryPoint, | |
| [Switch] | |
| $SetLastError | |
| ) | |
| $Properties = @{ | |
| DllName = $DllName | |
| FunctionName = $FunctionName | |
| ReturnType = $ReturnType | |
| } | |
| if ($ParameterTypes) { $Properties['ParameterTypes'] = $ParameterTypes } | |
| if ($NativeCallingConvention) { $Properties['NativeCallingConvention'] = $NativeCallingConvention } | |
| if ($Charset) { $Properties['Charset'] = $Charset } | |
| if ($SetLastError) { $Properties['SetLastError'] = $SetLastError } | |
| if ($EntryPoint) { $Properties['EntryPoint'] = $EntryPoint } | |
| New-Object PSObject -Property $Properties | |
| } | |
| function Add-Win32Type | |
| { | |
| <# | |
| .SYNOPSIS | |
| Creates a .NET type for an unmanaged Win32 function. | |
| Author: Matthew Graeber (@mattifestation) | |
| License: BSD 3-Clause | |
| Required Dependencies: None | |
| Optional Dependencies: func | |
| .DESCRIPTION | |
| Add-Win32Type enables you to easily interact with unmanaged (i.e. | |
| Win32 unmanaged) functions in PowerShell. After providing | |
| Add-Win32Type with a function signature, a .NET type is created | |
| using reflection (i.e. csc.exe is never called like with Add-Type). | |
| The 'func' helper function can be used to reduce typing when defining | |
| multiple function definitions. | |
| .PARAMETER DllName | |
| The name of the DLL. | |
| .PARAMETER FunctionName | |
| The name of the target function. | |
| .PARAMETER EntryPoint | |
| The DLL export function name. This argument should be specified if the | |
| specified function name is different than the name of the exported | |
| function. | |
| .PARAMETER ReturnType | |
| The return type of the function. | |
| .PARAMETER ParameterTypes | |
| The function parameters. | |
| .PARAMETER NativeCallingConvention | |
| Specifies the native calling convention of the function. Defaults to | |
| stdcall. | |
| .PARAMETER Charset | |
| If you need to explicitly call an 'A' or 'W' Win32 function, you can | |
| specify the character set. | |
| .PARAMETER SetLastError | |
| Indicates whether the callee calls the SetLastError Win32 API | |
| function before returning from the attributed method. | |
| .PARAMETER Module | |
| The in-memory module that will host the functions. Use | |
| New-InMemoryModule to define an in-memory module. | |
| .PARAMETER Namespace | |
| An optional namespace to prepend to the type. Add-Win32Type defaults | |
| to a namespace consisting only of the name of the DLL. | |
| .EXAMPLE | |
| $Mod = New-InMemoryModule -ModuleName Win32 | |
| $FunctionDefinitions = @( | |
| (func kernel32 GetProcAddress ([IntPtr]) @([IntPtr], [String]) -Charset Ansi -SetLastError), | |
| (func kernel32 GetModuleHandle ([Intptr]) @([String]) -SetLastError), | |
| (func ntdll RtlGetCurrentPeb ([IntPtr]) @()) | |
| ) | |
| $Types = $FunctionDefinitions | Add-Win32Type -Module $Mod -Namespace 'Win32' | |
| $Kernel32 = $Types['kernel32'] | |
| $Ntdll = $Types['ntdll'] | |
| $Ntdll::RtlGetCurrentPeb() | |
| $ntdllbase = $Kernel32::GetModuleHandle('ntdll') | |
| $Kernel32::GetProcAddress($ntdllbase, 'RtlGetCurrentPeb') | |
| .NOTES | |
| Inspired by Lee Holmes' Invoke-WindowsApi http://poshcode.org/2189 | |
| When defining multiple function prototypes, it is ideal to provide | |
| Add-Win32Type with an array of function signatures. That way, they | |
| are all incorporated into the same in-memory module. | |
| #> | |
| [OutputType([Hashtable])] | |
| Param( | |
| [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] | |
| [String] | |
| $DllName, | |
| [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] | |
| [String] | |
| $FunctionName, | |
| [Parameter(ValueFromPipelineByPropertyName = $True)] | |
| [String] | |
| $EntryPoint, | |
| [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] | |
| [Type] | |
| $ReturnType, | |
| [Parameter(ValueFromPipelineByPropertyName = $True)] | |
| [Type[]] | |
| $ParameterTypes, | |
| [Parameter(ValueFromPipelineByPropertyName = $True)] | |
| [Runtime.InteropServices.CallingConvention] | |
| $NativeCallingConvention = [Runtime.InteropServices.CallingConvention]::StdCall, | |
| [Parameter(ValueFromPipelineByPropertyName = $True)] | |
| [Runtime.InteropServices.CharSet] | |
| $Charset = [Runtime.InteropServices.CharSet]::Auto, | |
| [Parameter(ValueFromPipelineByPropertyName = $True)] | |
| [Switch] | |
| $SetLastError, | |
| [Parameter(Mandatory = $True)] | |
| [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] | |
| $Module, | |
| [ValidateNotNull()] | |
| [String] | |
| $Namespace = '' | |
| ) | |
| BEGIN | |
| { | |
| $TypeHash = @{} | |
| } | |
| PROCESS | |
| { | |
| if ($Module -is [Reflection.Assembly]) | |
| { | |
| if ($Namespace) | |
| { | |
| $TypeHash[$DllName] = $Module.GetType("$Namespace.$DllName") | |
| } | |
| else | |
| { | |
| $TypeHash[$DllName] = $Module.GetType($DllName) | |
| } | |
| } | |
| else | |
| { | |
| # Define one type for each DLL | |
| if (!$TypeHash.ContainsKey($DllName)) | |
| { | |
| if ($Namespace) | |
| { | |
| $TypeHash[$DllName] = $Module.DefineType("$Namespace.$DllName", 'Public,BeforeFieldInit') | |
| } | |
| else | |
| { | |
| $TypeHash[$DllName] = $Module.DefineType($DllName, 'Public,BeforeFieldInit') | |
| } | |
| } | |
| $Method = $TypeHash[$DllName].DefineMethod( | |
| $FunctionName, | |
| 'Public,Static,PinvokeImpl', | |
| $ReturnType, | |
| $ParameterTypes) | |
| # Make each ByRef parameter an Out parameter | |
| $i = 1 | |
| foreach($Parameter in $ParameterTypes) | |
| { | |
| if ($Parameter.IsByRef) | |
| { | |
| [void] $Method.DefineParameter($i, 'Out', $null) | |
| } | |
| $i++ | |
| } | |
| $DllImport = [Runtime.InteropServices.DllImportAttribute] | |
| $SetLastErrorField = $DllImport.GetField('SetLastError') | |
| $CallingConventionField = $DllImport.GetField('CallingConvention') | |
| $CharsetField = $DllImport.GetField('CharSet') | |
| $EntryPointField = $DllImport.GetField('EntryPoint') | |
| if ($SetLastError) { $SLEValue = $True } else { $SLEValue = $False } | |
| if ($PSBoundParameters['EntryPoint']) { $ExportedFuncName = $EntryPoint } else { $ExportedFuncName = $FunctionName } | |
| # Equivalent to C# version of [DllImport(DllName)] | |
| $Constructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor([String]) | |
| $DllImportAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($Constructor, | |
| $DllName, [Reflection.PropertyInfo[]] @(), [Object[]] @(), | |
| [Reflection.FieldInfo[]] @($SetLastErrorField, | |
| $CallingConventionField, | |
| $CharsetField, | |
| $EntryPointField), | |
| [Object[]] @($SLEValue, | |
| ([Runtime.InteropServices.CallingConvention] $NativeCallingConvention), | |
| ([Runtime.InteropServices.CharSet] $Charset), | |
| $ExportedFuncName)) | |
| $Method.SetCustomAttribute($DllImportAttribute) | |
| } | |
| } | |
| END | |
| { | |
| if ($Module -is [Reflection.Assembly]) | |
| { | |
| return $TypeHash | |
| } | |
| $ReturnTypes = @{} | |
| foreach ($Key in $TypeHash.Keys) | |
| { | |
| $Type = $TypeHash[$Key].CreateType() | |
| $ReturnTypes[$Key] = $Type | |
| } | |
| return $ReturnTypes | |
| } | |
| } | |
| function psenum | |
| { | |
| <# | |
| .SYNOPSIS | |
| Creates an in-memory enumeration for use in your PowerShell session. | |
| Author: Matthew Graeber (@mattifestation) | |
| License: BSD 3-Clause | |
| Required Dependencies: None | |
| Optional Dependencies: None | |
| .DESCRIPTION | |
| The 'psenum' function facilitates the creation of enums entirely in | |
| memory using as close to a "C style" as PowerShell will allow. | |
| .PARAMETER Module | |
| The in-memory module that will host the enum. Use | |
| New-InMemoryModule to define an in-memory module. | |
| .PARAMETER FullName | |
| The fully-qualified name of the enum. | |
| .PARAMETER Type | |
| The type of each enum element. | |
| .PARAMETER EnumElements | |
| A hashtable of enum elements. | |
| .PARAMETER Bitfield | |
| Specifies that the enum should be treated as a bitfield. | |
| .EXAMPLE | |
| $Mod = New-InMemoryModule -ModuleName Win32 | |
| $ImageSubsystem = psenum $Mod PE.IMAGE_SUBSYSTEM UInt16 @{ | |
| UNKNOWN = 0 | |
| NATIVE = 1 # Image doesn't require a subsystem. | |
| WINDOWS_GUI = 2 # Image runs in the Windows GUI subsystem. | |
| WINDOWS_CUI = 3 # Image runs in the Windows character subsystem. | |
| OS2_CUI = 5 # Image runs in the OS/2 character subsystem. | |
| POSIX_CUI = 7 # Image runs in the Posix character subsystem. | |
| NATIVE_WINDOWS = 8 # Image is a native Win9x driver. | |
| WINDOWS_CE_GUI = 9 # Image runs in the Windows CE subsystem. | |
| EFI_APPLICATION = 10 | |
| EFI_BOOT_SERVICE_DRIVER = 11 | |
| EFI_RUNTIME_DRIVER = 12 | |
| EFI_ROM = 13 | |
| XBOX = 14 | |
| WINDOWS_BOOT_APPLICATION = 16 | |
| } | |
| .NOTES | |
| PowerShell purists may disagree with the naming of this function but | |
| again, this was developed in such a way so as to emulate a "C style" | |
| definition as closely as possible. Sorry, I'm not going to name it | |
| New-Enum. :P | |
| #> | |
| [OutputType([Type])] | |
| Param | |
| ( | |
| [Parameter(Position = 0, Mandatory = $True)] | |
| [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] | |
| $Module, | |
| [Parameter(Position = 1, Mandatory = $True)] | |
| [ValidateNotNullOrEmpty()] | |
| [String] | |
| $FullName, | |
| [Parameter(Position = 2, Mandatory = $True)] | |
| [Type] | |
| $Type, | |
| [Parameter(Position = 3, Mandatory = $True)] | |
| [ValidateNotNullOrEmpty()] | |
| [Hashtable] | |
| $EnumElements, | |
| [Switch] | |
| $Bitfield | |
| ) | |
| if ($Module -is [Reflection.Assembly]) | |
| { | |
| return ($Module.GetType($FullName)) | |
| } | |
| $EnumType = $Type -as [Type] | |
| $EnumBuilder = $Module.DefineEnum($FullName, 'Public', $EnumType) | |
| if ($Bitfield) | |
| { | |
| $FlagsConstructor = [FlagsAttribute].GetConstructor(@()) | |
| $FlagsCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($FlagsConstructor, @()) | |
| $EnumBuilder.SetCustomAttribute($FlagsCustomAttribute) | |
| } | |
| foreach ($Key in $EnumElements.Keys) | |
| { | |
| # Apply the specified enum type to each element | |
| $null = $EnumBuilder.DefineLiteral($Key, $EnumElements[$Key] -as $EnumType) | |
| } | |
| $EnumBuilder.CreateType() | |
| } | |
| # A helper function used to reduce typing while defining struct | |
| # fields. | |
| function field | |
| { | |
| Param | |
| ( | |
| [Parameter(Position = 0, Mandatory = $True)] | |
| [UInt16] | |
| $Position, | |
| [Parameter(Position = 1, Mandatory = $True)] | |
| [Type] | |
| $Type, | |
| [Parameter(Position = 2)] | |
| [UInt16] | |
| $Offset, | |
| [Object[]] | |
| $MarshalAs | |
| ) | |
| @{ | |
| Position = $Position | |
| Type = $Type -as [Type] | |
| Offset = $Offset | |
| MarshalAs = $MarshalAs | |
| } | |
| } | |
| function struct | |
| { | |
| <# | |
| .SYNOPSIS | |
| Creates an in-memory struct for use in your PowerShell session. | |
| Author: Matthew Graeber (@mattifestation) | |
| License: BSD 3-Clause | |
| Required Dependencies: None | |
| Optional Dependencies: field | |
| .DESCRIPTION | |
| The 'struct' function facilitates the creation of structs entirely in | |
| memory using as close to a "C style" as PowerShell will allow. Struct | |
| fields are specified using a hashtable where each field of the struct | |
| is comprosed of the order in which it should be defined, its .NET | |
| type, and optionally, its offset and special marshaling attributes. | |
| One of the features of 'struct' is that after your struct is defined, | |
| it will come with a built-in GetSize method as well as an explicit | |
| converter so that you can easily cast an IntPtr to the struct without | |
| relying upon calling SizeOf and/or PtrToStructure in the Marshal | |
| class. | |
| .PARAMETER Module | |
| The in-memory module that will host the struct. Use | |
| New-InMemoryModule to define an in-memory module. | |
| .PARAMETER FullName | |
| The fully-qualified name of the struct. | |
| .PARAMETER StructFields | |
| A hashtable of fields. Use the 'field' helper function to ease | |
| defining each field. | |
| .PARAMETER PackingSize | |
| Specifies the memory alignment of fields. | |
| .PARAMETER ExplicitLayout | |
| Indicates that an explicit offset for each field will be specified. | |
| .EXAMPLE | |
| $Mod = New-InMemoryModule -ModuleName Win32 | |
| $ImageDosSignature = psenum $Mod PE.IMAGE_DOS_SIGNATURE UInt16 @{ | |
| DOS_SIGNATURE = 0x5A4D | |
| OS2_SIGNATURE = 0x454E | |
| OS2_SIGNATURE_LE = 0x454C | |
| VXD_SIGNATURE = 0x454C | |
| } | |
| $ImageDosHeader = struct $Mod PE.IMAGE_DOS_HEADER @{ | |
| e_magic = field 0 $ImageDosSignature | |
| e_cblp = field 1 UInt16 | |
| e_cp = field 2 UInt16 | |
| e_crlc = field 3 UInt16 | |
| e_cparhdr = field 4 UInt16 | |
| e_minalloc = field 5 UInt16 | |
| e_maxalloc = field 6 UInt16 | |
| e_ss = field 7 UInt16 | |
| e_sp = field 8 UInt16 | |
| e_csum = field 9 UInt16 | |
| e_ip = field 10 UInt16 | |
| e_cs = field 11 UInt16 | |
| e_lfarlc = field 12 UInt16 | |
| e_ovno = field 13 UInt16 | |
| e_res = field 14 UInt16[] -MarshalAs @('ByValArray', 4) | |
| e_oemid = field 15 UInt16 | |
| e_oeminfo = field 16 UInt16 | |
| e_res2 = field 17 UInt16[] -MarshalAs @('ByValArray', 10) | |
| e_lfanew = field 18 Int32 | |
| } | |
| # Example of using an explicit layout in order to create a union. | |
| $TestUnion = struct $Mod TestUnion @{ | |
| field1 = field 0 UInt32 0 | |
| field2 = field 1 IntPtr 0 | |
| } -ExplicitLayout | |
| .NOTES | |
| PowerShell purists may disagree with the naming of this function but | |
| again, this was developed in such a way so as to emulate a "C style" | |
| definition as closely as possible. Sorry, I'm not going to name it | |
| New-Struct. :P | |
| #> | |
| [OutputType([Type])] | |
| Param | |
| ( | |
| [Parameter(Position = 1, Mandatory = $True)] | |
| [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] | |
| $Module, | |
| [Parameter(Position = 2, Mandatory = $True)] | |
| [ValidateNotNullOrEmpty()] | |
| [String] | |
| $FullName, | |
| [Parameter(Position = 3, Mandatory = $True)] | |
| [ValidateNotNullOrEmpty()] | |
| [Hashtable] | |
| $StructFields, | |
| [Reflection.Emit.PackingSize] | |
| $PackingSize = [Reflection.Emit.PackingSize]::Unspecified, | |
| [Switch] | |
| $ExplicitLayout | |
| ) | |
| if ($Module -is [Reflection.Assembly]) | |
| { | |
| return ($Module.GetType($FullName)) | |
| } | |
| [Reflection.TypeAttributes] $StructAttributes = 'AnsiClass, | |
| Class, | |
| Public, | |
| Sealed, | |
| BeforeFieldInit' | |
| if ($ExplicitLayout) | |
| { | |
| $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::ExplicitLayout | |
| } | |
| else | |
| { | |
| $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::SequentialLayout | |
| } | |
| $StructBuilder = $Module.DefineType($FullName, $StructAttributes, [ValueType], $PackingSize) | |
| $ConstructorInfo = [Runtime.InteropServices.MarshalAsAttribute].GetConstructors()[0] | |
| $SizeConst = @([Runtime.InteropServices.MarshalAsAttribute].GetField('SizeConst')) | |
| $Fields = New-Object Hashtable[]($StructFields.Count) | |
| # Sort each field according to the orders specified | |
| # Unfortunately, PSv2 doesn't have the luxury of the | |
| # hashtable [Ordered] accelerator. | |
| foreach ($Field in $StructFields.Keys) | |
| { | |
| $Index = $StructFields[$Field]['Position'] | |
| $Fields[$Index] = @{FieldName = $Field; Properties = $StructFields[$Field]} | |
| } | |
| foreach ($Field in $Fields) | |
| { | |
| $FieldName = $Field['FieldName'] | |
| $FieldProp = $Field['Properties'] | |
| $Offset = $FieldProp['Offset'] | |
| $Type = $FieldProp['Type'] | |
| $MarshalAs = $FieldProp['MarshalAs'] | |
| $NewField = $StructBuilder.DefineField($FieldName, $Type, 'Public') | |
| if ($MarshalAs) | |
| { | |
| $UnmanagedType = $MarshalAs[0] -as ([Runtime.InteropServices.UnmanagedType]) | |
| if ($MarshalAs[1]) | |
| { | |
| $Size = $MarshalAs[1] | |
| $AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo, | |
| $UnmanagedType, $SizeConst, @($Size)) | |
| } | |
| else | |
| { | |
| $AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo, [Object[]] @($UnmanagedType)) | |
| } | |
| $NewField.SetCustomAttribute($AttribBuilder) | |
| } | |
| if ($ExplicitLayout) { $NewField.SetOffset($Offset) } | |
| } | |
| # Make the struct aware of its own size. | |
| # No more having to call [Runtime.InteropServices.Marshal]::SizeOf! | |
| $SizeMethod = $StructBuilder.DefineMethod('GetSize', | |
| 'Public, Static', | |
| [Int], | |
| [Type[]] @()) | |
| $ILGenerator = $SizeMethod.GetILGenerator() | |
| # Thanks for the help, Jason Shirk! | |
| $ILGenerator.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder) | |
| $ILGenerator.Emit([Reflection.Emit.OpCodes]::Call, | |
| [Type].GetMethod('GetTypeFromHandle')) | |
| $ILGenerator.Emit([Reflection.Emit.OpCodes]::Call, | |
| [Runtime.InteropServices.Marshal].GetMethod('SizeOf', [Type[]] @([Type]))) | |
| $ILGenerator.Emit([Reflection.Emit.OpCodes]::Ret) | |
| # Allow for explicit casting from an IntPtr | |
| # No more having to call [Runtime.InteropServices.Marshal]::PtrToStructure! | |
| $ImplicitConverter = $StructBuilder.DefineMethod('op_Implicit', | |
| 'PrivateScope, Public, Static, HideBySig, SpecialName', | |
| $StructBuilder, | |
| [Type[]] @([IntPtr])) | |
| $ILGenerator2 = $ImplicitConverter.GetILGenerator() | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Nop) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldarg_0) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call, | |
| [Type].GetMethod('GetTypeFromHandle')) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call, | |
| [Runtime.InteropServices.Marshal].GetMethod('PtrToStructure', [Type[]] @([IntPtr], [Type]))) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Unbox_Any, $StructBuilder) | |
| $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ret) | |
| $StructBuilder.CreateType() | |
| } | |
| #endregion PSReflect |
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