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SystemUtilities.cs
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168 lines (128 loc) · 5.65 KB
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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// https://github.com/microsoft/nodejstools/blob/main/Nodejs/Product/Nodejs/SharedProject/SystemUtilities.cs
using System;
using System.Runtime.InteropServices;
namespace Microsoft.NodejsTools.SharedProject;
/// <summary>
/// Utility for accessing window IShell* interfaces in order to use them to launch a process unelevated
/// </summary>
internal static class SystemUtility
{
/// <summary>
/// We are elevated and should launch the process unelevated. We can't create the
/// process directly without it becoming elevated. So to workaround this, we have
/// explorer do the process creation (explorer is typically running unelevated).
/// </summary>
internal static void ExecuteProcessUnElevated(string process, string args, string currentDirectory = "")
{
var shellWindows = (IShellWindows)new CShellWindows();
// Get the desktop window
object loc = CSIDL_Desktop;
object unused = new object();
var serviceProvider = (IServiceProvider)shellWindows.FindWindowSW(ref loc, ref unused, SWC_DESKTOP, out var _, SWFO_NEEDDISPATCH);
// Get the shell browser
var serviceGuid = SID_STopLevelBrowser;
var interfaceGuid = typeof(IShellBrowser).GUID;
var shellBrowser = (IShellBrowser)serviceProvider.QueryService(ref serviceGuid, ref interfaceGuid);
// Get the shell dispatch
var dispatch = typeof(IDispatch).GUID;
var folderView = (IShellFolderViewDual)shellBrowser.QueryActiveShellView().GetItemObject(SVGIO_BACKGROUND, ref dispatch);
var shellDispatch = (IShellDispatch2)folderView.Application;
// Use the dispatch (which is unelevated) to launch the process for us
shellDispatch.ShellExecute(process, args, currentDirectory, string.Empty, SW_SHOWNORMAL);
}
/// <summary>
/// Interop definitions
/// </summary>
private const int CSIDL_Desktop = 0;
private const int SWC_DESKTOP = 8;
private const int SWFO_NEEDDISPATCH = 1;
private const int SW_SHOWNORMAL = 1;
private const int SVGIO_BACKGROUND = 0;
private static readonly Guid SID_STopLevelBrowser = new("4C96BE40-915C-11CF-99D3-00AA004AE837");
[ComImport]
[Guid("9BA05972-F6A8-11CF-A442-00A0C90A8F39")]
[ClassInterface(ClassInterfaceType.None)]
private class CShellWindows
{
}
[ComImport]
[Guid("85CB6900-4D95-11CF-960C-0080C7F4EE85")]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
private interface IShellWindows
{
[return: MarshalAs(UnmanagedType.IDispatch)]
object FindWindowSW([MarshalAs(UnmanagedType.Struct)] ref object pvarloc, [MarshalAs(UnmanagedType.Struct)] ref object pvarlocRoot, int swClass, out int pHWND, int swfwOptions);
}
[ComImport]
[Guid("6d5140c1-7436-11ce-8034-00aa006009fa")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IServiceProvider
{
[return: MarshalAs(UnmanagedType.Interface)]
object QueryService(ref Guid guidService, ref Guid riid);
}
[ComImport]
[Guid("000214E2-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IShellBrowser
{
void VTableGap01(); // GetWindow
void VTableGap02(); // ContextSensitiveHelp
void VTableGap03(); // InsertMenusSB
void VTableGap04(); // SetMenuSB
void VTableGap05(); // RemoveMenusSB
void VTableGap06(); // SetStatusTextSB
void VTableGap07(); // EnableModelessSB
void VTableGap08(); // TranslateAcceleratorSB
void VTableGap09(); // BrowseObject
void VTableGap10(); // GetViewStateStream
void VTableGap11(); // GetControlWindow
void VTableGap12(); // SendControlMsg
IShellView QueryActiveShellView();
}
[ComImport]
[Guid("000214E3-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IShellView
{
void VTableGap01(); // GetWindow
void VTableGap02(); // ContextSensitiveHelp
void VTableGap03(); // TranslateAcceleratorA
void VTableGap04(); // EnableModeless
void VTableGap05(); // UIActivate
void VTableGap06(); // Refresh
void VTableGap07(); // CreateViewWindow
void VTableGap08(); // DestroyViewWindow
void VTableGap09(); // GetCurrentInfo
void VTableGap10(); // AddPropertySheetPages
void VTableGap11(); // SaveViewState
void VTableGap12(); // SelectItem
[return: MarshalAs(UnmanagedType.Interface)]
object GetItemObject(uint aspectOfView, ref Guid riid);
}
[ComImport]
[Guid("00020400-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
private interface IDispatch
{
}
[ComImport]
[Guid("E7A1AF80-4D96-11CF-960C-0080C7F4EE85")]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
private interface IShellFolderViewDual
{
object Application
{
[return: MarshalAs(UnmanagedType.IDispatch)]
get;
}
}
[ComImport]
[Guid("A4C6892C-3BA9-11D2-9DEA-00C04FB16162")]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
public interface IShellDispatch2
{
void ShellExecute([MarshalAs(UnmanagedType.BStr)] string file, [MarshalAs(UnmanagedType.Struct)] object vArgs, [MarshalAs(UnmanagedType.Struct)] object vDir, [MarshalAs(UnmanagedType.Struct)] object vOperation, [MarshalAs(UnmanagedType.Struct)] object vShow);
}
}