mirror of
https://github.com/PowerShell/PowerShell
synced 2026-06-08 12:12:50 +00:00
657 lines
26 KiB
C#
657 lines
26 KiB
C#
/********************************************************************++
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Copyright (c) Microsoft Corporation. All rights reserved.
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--********************************************************************/
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using System.Collections;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Security;
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using System.Text;
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using System.Xml;
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using Microsoft.Win32;
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using System.Collections.Generic;
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using System.Management.Automation.Language;
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namespace System.Management.Automation
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{
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/// <summary>
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/// Defines generic utilities and helper methods for PowerShell
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/// </summary>
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internal static class PsUtils
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{
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internal static string ArmArchitecture = "ARM";
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/// <summary>
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/// Safely retrieves the MainModule property of a
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/// process. Version 2.0 and below of the .NET Framework are
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/// impacted by a Win32 API usability knot that throws an
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/// exception if API tries to enumerate the process' modules
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/// while it is still loading them. This generates the error
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/// message: Only part of a ReadProcessMemory or
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/// WriteProcessMemory request was completed.
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/// The BCL fix in V3 was to just try more, so we do the same
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/// thing.
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///
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/// Note: If you attempt to retrieve the MainModule of a 64-bit
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/// process from a WOW64 (32-bit) process, the Win32 API has a fatal
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/// flaw that causes this to return the same error.
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///
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/// If you need the MainModule of a 64-bit process from a WOW64
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/// process, you will need to write the P/Invoke yourself.
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/// </summary>
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///
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/// <param name="targetProcess">The process from which to
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/// retrieve the MainModule</param>
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/// <exception cref="NotSupportedException">
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/// You are trying to access the MainModule property for a process that is running
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/// on a remote computer. This property is available only for processes that are
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/// running on the local computer.
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/// </exception>
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/// <exception cref="InvalidOperationException">
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/// The process Id is not available (or) The process has exited.
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/// </exception>
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/// <exception cref="System.ComponentModel.Win32Exception">
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///
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/// </exception>
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internal static ProcessModule GetMainModule(Process targetProcess)
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{
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int caughtCount = 0;
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ProcessModule mainModule = null;
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while (mainModule == null)
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{
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try
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{
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mainModule = targetProcess.MainModule;
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}
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catch (System.ComponentModel.Win32Exception e)
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{
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// If this is an Access Denied error (which can happen with thread impersonation)
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// then re-throw immediately.
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if (e.NativeErrorCode == 5)
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throw;
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// Otherwise retry to ensure module is loaded.
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caughtCount++;
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System.Threading.Thread.Sleep(100);
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if (caughtCount == 5)
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throw;
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}
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}
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return mainModule;
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}
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// Cache of the current process' parentId
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private static int? s_currentParentProcessId;
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private static readonly int s_currentProcessId = Process.GetCurrentProcess().Id;
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/// <summary>
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/// Retrieve the parent process of a process.
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///
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/// Previously this code used WMI, but WMI is causing a CPU spike whenever the query gets called as it results in
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/// tzres.dll and tzres.mui.dll being loaded into every process to convert the time information to local format.
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/// For perf reasons, we resort to P/Invoke.
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/// </summary>
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///
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/// <param name="current">The process we want to find the
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/// parent of</param>
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internal static Process GetParentProcess(Process current)
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{
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var processId = current.Id;
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// This is a common query (parent id for the current process)
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// Use cached value if available
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var parentProcessId = processId == s_currentProcessId && s_currentParentProcessId.HasValue ?
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s_currentParentProcessId.Value :
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Microsoft.PowerShell.ProcessCodeMethods.GetParentPid(current);
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// cache the current process parent pid if it hasn't been done yet
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if (processId == s_currentProcessId && !s_currentParentProcessId.HasValue)
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{
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s_currentParentProcessId = parentProcessId;
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}
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if (parentProcessId == 0)
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return null;
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try
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{
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Process returnProcess = Process.GetProcessById(parentProcessId);
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// Ensure the process started before the current
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// process, as it could have gone away and had the
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// PID recycled.
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if (returnProcess.StartTime <= current.StartTime)
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return returnProcess;
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else
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return null;
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}
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catch (ArgumentException)
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{
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// GetProcessById throws an ArgumentException when
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// you reach the top of the chain -- Explorer.exe
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// has a parent process, but you cannot retrieve it.
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return null;
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}
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}
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/// <summary>
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/// Returns processor architecture for the current process.
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/// If powershell is running inside Wow64, then <see cref="ProcessorArchitecture.X86"/> is returned.
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/// </summary>
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/// <returns>processor architecture for the current process</returns>
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internal static ProcessorArchitecture GetProcessorArchitecture(out bool isRunningOnArm)
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{
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var sysInfo = new NativeMethods.SYSTEM_INFO();
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NativeMethods.GetSystemInfo(ref sysInfo);
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ProcessorArchitecture result;
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isRunningOnArm = false;
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switch (sysInfo.wProcessorArchitecture)
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{
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case NativeMethods.PROCESSOR_ARCHITECTURE_IA64:
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result = ProcessorArchitecture.IA64;
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break;
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case NativeMethods.PROCESSOR_ARCHITECTURE_AMD64:
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result = ProcessorArchitecture.Amd64;
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break;
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case NativeMethods.PROCESSOR_ARCHITECTURE_INTEL:
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result = ProcessorArchitecture.X86;
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break;
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case NativeMethods.PROCESSOR_ARCHITECTURE_ARM:
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result = ProcessorArchitecture.None;
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isRunningOnArm = true;
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break;
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default:
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result = ProcessorArchitecture.None;
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break;
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}
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return result;
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}
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/// <summary>
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/// Return true/false to indicate whether the processor architecture is ARM
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/// </summary>
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/// <returns></returns>
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internal static bool IsRunningOnProcessorArchitectureARM()
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{
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Architecture arch = RuntimeInformation.OSArchitecture;
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return arch == Architecture.Arm || arch == Architecture.Arm64;
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}
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/// <summary>
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/// Get a temporary directory to use, needs to be unique to avoid collision
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/// </summary>
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internal static string GetTemporaryDirectory()
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{
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string tempDir = String.Empty;
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string tempPath = Path.GetTempPath();
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do
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{
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tempDir = Path.Combine(tempPath,System.Guid.NewGuid().ToString());
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}
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while (Directory.Exists(tempDir));
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try
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{
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Directory.CreateDirectory(tempDir);
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}
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catch (UnauthorizedAccessException)
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{
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tempDir = String.Empty; // will become current working directory
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}
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return tempDir;
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}
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internal static string GetHostName()
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{
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// Note: non-windows CoreCLR does not support System.Net yet
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if (Platform.IsWindows)
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{
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return WinGetHostName();
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}
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else
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{
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return Platform.NonWindowsGetHostName();
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}
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}
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internal static string WinGetHostName()
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{
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System.Net.NetworkInformation.IPGlobalProperties ipProperties =
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System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties();
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string hostname = ipProperties.HostName;
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if (!String.IsNullOrEmpty(ipProperties.DomainName))
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{
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hostname = hostname + "." + ipProperties.DomainName;
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}
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return hostname;
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}
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internal static uint GetNativeThreadId()
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{
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#if UNIX
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return Platform.NonWindowsGetThreadId();
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#else
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return NativeMethods.GetCurrentThreadId();
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#endif
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}
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private static class NativeMethods
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{
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// Important:
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// this clone has a clone in SMA in admin\monad\src\m3p\product\ServiceCore\WorkflowCore\WorkflowRuntimeCompilation.cs
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// if you are making any changes specific to this class then update the clone as well.
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internal const ushort PROCESSOR_ARCHITECTURE_INTEL = 0;
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internal const ushort PROCESSOR_ARCHITECTURE_ARM = 5;
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internal const ushort PROCESSOR_ARCHITECTURE_IA64 = 6;
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internal const ushort PROCESSOR_ARCHITECTURE_AMD64 = 9;
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internal const ushort PROCESSOR_ARCHITECTURE_UNKNOWN = 0xFFFF;
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[StructLayout(LayoutKind.Sequential)]
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internal struct SYSTEM_INFO
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{
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public ushort wProcessorArchitecture;
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public ushort wReserved;
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public uint dwPageSize;
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public IntPtr lpMinimumApplicationAddress;
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public IntPtr lpMaximumApplicationAddress;
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public UIntPtr dwActiveProcessorMask;
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public uint dwNumberOfProcessors;
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public uint dwProcessorType;
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public uint dwAllocationGranularity;
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public ushort wProcessorLevel;
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public ushort wProcessorRevision;
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};
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[DllImport(PinvokeDllNames.GetSystemInfoDllName)]
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internal static extern void GetSystemInfo(ref SYSTEM_INFO lpSystemInfo);
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[DllImport(PinvokeDllNames.GetCurrentThreadIdDllName)]
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internal static extern uint GetCurrentThreadId();
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}
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#region ASTUtils
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/// <summary>
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/// This method is to get the unique key for a UsingExpressionAst. The key is a base64
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/// encoded string based on the text of the UsingExpressionAst.
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///
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/// This method is used when handling a script block that contains $using for Invoke-Command.
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///
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/// When run Invoke-Command targeting a machine that runs PSv3 or above, we pass a dictionary
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/// to the remote end that contains the key of each UsingExpressionAst and its value. This method
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/// is used to generate the key.
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/// </summary>
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/// <param name="usingAst">A using expression</param>
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/// <returns>Base64 encoded string as the key of the UsingExpressionAst</returns>
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internal static string GetUsingExpressionKey(Language.UsingExpressionAst usingAst)
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{
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Diagnostics.Assert(usingAst != null, "Caller makes sure the parameter is not null");
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// We cannot call ToLowerInvariant unconditionally, because usingAst might
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// contain IndexExpressionAst in its SubExpression, such as
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// $using:bar["AAAA"]
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// and the index "AAAA" might not get us the same value as "aaaa".
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//
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// But we do want a unique key to represent the same UsingExpressionAst's as much
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// as possible, so as to avoid sending redundant key-value's to remote machine.
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// As a workaround, we call ToLowerInvariant when the SubExpression of usingAst
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// is a VariableExpressionAst, because:
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// (1) Variable name is case insensitive;
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// (2) People use $using to refer to a variable most of the time.
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string usingAstText = usingAst.ToString();
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if (usingAst.SubExpression is Language.VariableExpressionAst)
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{
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usingAstText = usingAstText.ToLowerInvariant();
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}
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return StringToBase64Converter.StringToBase64String(usingAstText);
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}
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#endregion ASTUtils
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#region EvaluatePowerShellDataFile
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/// <summary>
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/// Evaluate a powershell data file as if it's a module manifest
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/// </summary>
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/// <param name="parameterName"></param>
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/// <param name="psDataFilePath"></param>
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/// <param name="context"></param>
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/// <param name="skipPathValidation"></param>
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/// <returns></returns>
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internal static Hashtable EvaluatePowerShellDataFileAsModuleManifest(
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string parameterName,
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string psDataFilePath,
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ExecutionContext context,
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bool skipPathValidation)
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{
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// Use the same capabilities as the module manifest
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// e.g. allow 'PSScriptRoot' variable
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return EvaluatePowerShellDataFile(
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parameterName,
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psDataFilePath,
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context,
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Microsoft.PowerShell.Commands.ModuleCmdletBase.PermittedCmdlets,
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new[] { "PSScriptRoot" },
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allowEnvironmentVariables: true,
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skipPathValidation: skipPathValidation);
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}
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/// <summary>
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/// Get a Hashtable object out of a PowerShell data file (.psd1)
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/// </summary>
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/// <param name="parameterName">
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/// Name of the parameter that takes the specified .psd1 file as a value
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/// </param>
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/// <param name="psDataFilePath">
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/// Path to the powershell data file
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/// </param>
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/// <param name="context">
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/// ExecutionContext to use
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/// </param>
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/// <param name="allowedCommands">
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/// Set of command names that are allowed to use in the .psd1 file
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/// </param>
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/// <param name="allowedVariables">
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/// Set of variable names that are allowed to use in the .psd1 file
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/// </param>
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/// <param name="allowEnvironmentVariables">
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/// If true, allow to use environment variables in the .psd1 file
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/// </param>
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/// <param name="skipPathValidation">
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/// If true, caller guarantees the path is valid
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/// </param>
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/// <returns></returns>
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internal static Hashtable EvaluatePowerShellDataFile(
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string parameterName,
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string psDataFilePath,
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ExecutionContext context,
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IEnumerable<string> allowedCommands,
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IEnumerable<string> allowedVariables,
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bool allowEnvironmentVariables,
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bool skipPathValidation)
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{
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if (!skipPathValidation && string.IsNullOrEmpty(parameterName)) { throw PSTraceSource.NewArgumentNullException("parameterName"); }
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if (string.IsNullOrEmpty(psDataFilePath)) { throw PSTraceSource.NewArgumentNullException("psDataFilePath"); }
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if (context == null) { throw PSTraceSource.NewArgumentNullException("context"); }
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string resolvedPath;
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if (skipPathValidation)
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{
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resolvedPath = psDataFilePath;
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}
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else
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{
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#region "ValidatePowerShellDataFilePath"
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bool isPathValid = true;
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// File extension needs to be .psd1
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string pathExt = Path.GetExtension(psDataFilePath);
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if (string.IsNullOrEmpty(pathExt) ||
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!StringLiterals.PowerShellDataFileExtension.Equals(pathExt, StringComparison.OrdinalIgnoreCase))
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{
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isPathValid = false;
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}
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ProviderInfo provider;
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var resolvedPaths = context.SessionState.Path.GetResolvedProviderPathFromPSPath(psDataFilePath, out provider);
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// ConfigPath should be resolved as FileSystem provider
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if (provider == null || !Microsoft.PowerShell.Commands.FileSystemProvider.ProviderName.Equals(provider.Name, StringComparison.OrdinalIgnoreCase))
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{
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isPathValid = false;
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}
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// ConfigPath should be resolved to a single path
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if (resolvedPaths.Count != 1)
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{
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isPathValid = false;
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}
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if (!isPathValid)
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{
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throw PSTraceSource.NewArgumentException(
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parameterName,
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ParserStrings.CannotResolvePowerShellDataFilePath,
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psDataFilePath);
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}
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resolvedPath = resolvedPaths[0];
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#endregion "ValidatePowerShellDataFilePath"
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}
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#region "LoadAndEvaluatePowerShellDataFile"
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object evaluationResult;
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try
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{
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// Create the scriptInfo for the .psd1 file
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string dataFileName = Path.GetFileName(resolvedPath);
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var dataFileScriptInfo = new ExternalScriptInfo(dataFileName, resolvedPath, context);
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ScriptBlock scriptBlock = dataFileScriptInfo.ScriptBlock;
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// Validate the scriptblock
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scriptBlock.CheckRestrictedLanguage(allowedCommands, allowedVariables, allowEnvironmentVariables);
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// Evaluate the scriptblock
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object oldPsScriptRoot = context.GetVariableValue(SpecialVariables.PSScriptRootVarPath);
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try
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{
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// Set the $PSScriptRoot before the evaluation
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context.SetVariable(SpecialVariables.PSScriptRootVarPath, Path.GetDirectoryName(resolvedPath));
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evaluationResult = PSObject.Base(scriptBlock.InvokeReturnAsIs());
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}
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finally
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{
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context.SetVariable(SpecialVariables.PSScriptRootVarPath, oldPsScriptRoot);
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}
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}
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catch (RuntimeException ex)
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{
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throw PSTraceSource.NewInvalidOperationException(
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ex,
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ParserStrings.CannotLoadPowerShellDataFile,
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psDataFilePath,
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ex.Message);
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}
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var retResult = evaluationResult as Hashtable;
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if (retResult == null)
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{
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throw PSTraceSource.NewInvalidOperationException(
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ParserStrings.InvalidPowerShellDataFile,
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psDataFilePath);
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}
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#endregion "LoadAndEvaluatePowerShellDataFile"
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return retResult;
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}
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#endregion EvaluatePowerShellDataFile
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internal static readonly string[] ManifestModuleVersionPropertyName = new[] { "ModuleVersion" };
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internal static readonly string[] ManifestGuidPropertyName = new[] { "GUID" };
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internal static readonly string[] FastModuleManifestAnalysisPropertyNames = new[] { "AliasesToExport", "CmdletsToExport", "FunctionsToExport", "NestedModules", "RootModule", "ModuleToProcess", "ModuleVersion" };
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internal static Hashtable GetModuleManifestProperties(string psDataFilePath, string[] keys)
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{
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string dataFileContents = ScriptAnalysis.ReadScript(psDataFilePath);
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ParseError[] parseErrors;
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var ast = (new Parser()).Parse(psDataFilePath, dataFileContents, null, out parseErrors, ParseMode.ModuleAnalysis);
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if (parseErrors.Length > 0)
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{
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var pe = new ParseException(parseErrors);
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throw PSTraceSource.NewInvalidOperationException(
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pe,
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ParserStrings.CannotLoadPowerShellDataFile,
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psDataFilePath,
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pe.Message);
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}
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string unused1;
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string unused2;
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var pipeline = ast.GetSimplePipeline(false, out unused1, out unused2);
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if (pipeline != null)
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{
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var hashtableAst = pipeline.GetPureExpression() as HashtableAst;
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if (hashtableAst != null)
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{
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var result = new Hashtable(StringComparer.OrdinalIgnoreCase);
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foreach (var pair in hashtableAst.KeyValuePairs)
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{
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var key = pair.Item1 as StringConstantExpressionAst;
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if (key != null && keys.Contains(key.Value, StringComparer.OrdinalIgnoreCase))
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{
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try
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{
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var val = pair.Item2.SafeGetValue();
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result[key.Value] = val;
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}
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catch
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{
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throw PSTraceSource.NewInvalidOperationException(
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ParserStrings.InvalidPowerShellDataFile,
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psDataFilePath);
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}
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}
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}
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return result;
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}
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}
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throw PSTraceSource.NewInvalidOperationException(
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ParserStrings.InvalidPowerShellDataFile,
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psDataFilePath);
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}
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}
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/// <summary>
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/// This class provides helper methods for converting to/fro from
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/// string to base64string
|
|
/// </summary>
|
|
internal static class StringToBase64Converter
|
|
{
|
|
/// <summary>
|
|
/// Converts string to base64 encoded string
|
|
/// </summary>
|
|
/// <param name="input">string to encode</param>
|
|
/// <returns>base64 encoded string</returns>
|
|
internal static string StringToBase64String(string input)
|
|
{
|
|
// NTRAID#Windows Out Of Band Releases-926471-2005/12/27-JonN
|
|
// shell crashes if you pass an empty script block to a native command
|
|
if (null == input)
|
|
{
|
|
throw PSTraceSource.NewArgumentNullException("input");
|
|
}
|
|
string base64 = Convert.ToBase64String
|
|
(
|
|
Encoding.Unicode.GetBytes(input.ToCharArray())
|
|
);
|
|
return base64;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decodes base64 encoded string
|
|
/// </summary>
|
|
/// <param name="base64">base64 string to decode</param>
|
|
/// <returns>decoded string</returns>
|
|
internal static string Base64ToString(string base64)
|
|
{
|
|
if (string.IsNullOrEmpty(base64))
|
|
{
|
|
throw PSTraceSource.NewArgumentNullException("base64");
|
|
}
|
|
string output = new string(Encoding.Unicode.GetChars(Convert.FromBase64String(base64)));
|
|
return output;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decodes base64 encoded string in to args array
|
|
/// </summary>
|
|
/// <param name="base64"></param>
|
|
/// <returns></returns>
|
|
internal static object[] Base64ToArgsConverter(string base64)
|
|
{
|
|
if (string.IsNullOrEmpty(base64))
|
|
{
|
|
throw PSTraceSource.NewArgumentNullException("base64");
|
|
}
|
|
string decoded = new string(Encoding.Unicode.GetChars(Convert.FromBase64String(base64)));
|
|
|
|
//Deserialize string
|
|
XmlReader reader = XmlReader.Create(new StringReader(decoded), InternalDeserializer.XmlReaderSettingsForCliXml);
|
|
object dso;
|
|
Deserializer deserializer = new Deserializer(reader);
|
|
dso = deserializer.Deserialize();
|
|
if (deserializer.Done() == false)
|
|
{
|
|
//This helper function should move to host and it should provide appropriate
|
|
//error message there.
|
|
throw PSTraceSource.NewArgumentException(MinishellParameterBinderController.ArgsParameter);
|
|
}
|
|
|
|
PSObject mo = dso as PSObject;
|
|
if (mo == null)
|
|
{
|
|
//This helper function should move the host. Provide appropriate error message.
|
|
//Format of args parameter is not correct.
|
|
throw PSTraceSource.NewArgumentException(MinishellParameterBinderController.ArgsParameter);
|
|
}
|
|
|
|
var argsList = mo.BaseObject as ArrayList;
|
|
if (argsList == null)
|
|
{
|
|
//This helper function should move the host. Provide appropriate error message.
|
|
//Format of args parameter is not correct.
|
|
throw PSTraceSource.NewArgumentException(MinishellParameterBinderController.ArgsParameter);
|
|
}
|
|
|
|
return argsList.ToArray();
|
|
}
|
|
}
|
|
|
|
#region ReferenceEqualityComparer
|
|
|
|
/// <summary>
|
|
/// Equality comparer based on Object Identity
|
|
/// </summary>
|
|
internal class ReferenceEqualityComparer : IEqualityComparer
|
|
{
|
|
bool IEqualityComparer.Equals(object x, object y)
|
|
{
|
|
return Object.ReferenceEquals(x, y);
|
|
}
|
|
|
|
int IEqualityComparer.GetHashCode(object obj)
|
|
{
|
|
// The Object.GetHashCode and RuntimeHelpers.GetHashCode methods are used in the following scenarios:
|
|
//
|
|
// Object.GetHashCode is useful in scenarios where you care about object value. Two strings with identical
|
|
// contents will return the same value for Object.GetHashCode.
|
|
//
|
|
// RuntimeHelpers.GetHashCode is useful in scenarios where you care about object identity. Two strings with
|
|
// identical contents will return different values for RuntimeHelpers.GetHashCode, because they are different
|
|
// string objects, although their contents are the same.
|
|
|
|
return RuntimeHelpers.GetHashCode(obj);
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
|