// Copyright Keysight Technologies 2012-2025
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, you can obtain one at http://mozilla.org/MPL/2.0/.
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using System;
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using System.Diagnostics;
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using System.IO;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace OpenTap
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{
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internal static class ExecutorSubProcess
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{
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public class EnvVarNames
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{
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public static string TpmInteropPipeName = "TPM_PIPE";
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public static string ParentProcessExeDir = "TPM_PARENTPROCESSDIR";
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public static string OpenTapInitDirectory = "OPENTAP_INIT_DIRECTORY";
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}
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}
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internal static class ExecutorClient
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{
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/// <summary>
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/// Is this process an isolated sub process of tap.exe
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/// </summary>
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public static bool IsRunningIsolated => Environment.GetEnvironmentVariable(ExecutorSubProcess.EnvVarNames.ParentProcessExeDir) != null;
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/// <summary>
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/// Is this process a sub process of tap.exe
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/// </summary>
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public static bool IsExecutorMode => Environment.GetEnvironmentVariable(ExecutorSubProcess.EnvVarNames.TpmInteropPipeName) != null;
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/// <summary>
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/// The directory containing the OpenTAP installation.
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/// This is usually the value of the environment variable OPENTAP_INIT_DIRECTORY set by tap.exe
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/// If this value is not set, use the location of OpenTap.dll instead
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/// In some cases, when running isolated this is that value but from the parent process.
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/// </summary>
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public static string ExeDir
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{
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get
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{
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if (IsRunningIsolated)
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return Environment.GetEnvironmentVariable(ExecutorSubProcess.EnvVarNames.ParentProcessExeDir);
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else
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{
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var exePath = Environment.GetEnvironmentVariable(ExecutorSubProcess.EnvVarNames.OpenTapInitDirectory);
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if (exePath != null)
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return exePath;
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// Referencing OpenTap.dll causes the file to become locked.
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// Ensure OpenTap.dll is only loaded if the environment variable is not set.
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// This should only happen if OpenTAP was not loaded through tap.exe.
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return GetOpenTapDllLocation();
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}
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}
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}
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public static string Dotnet => _dotnet ??= mineDotnet();
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private static string _dotnet = null;
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private static string mineDotnet()
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{
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// Ensure dotnet is always assigned. "dotnet' is used as a fallback, in which case the system
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// will try to resolve it from the current PATH
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// Look for dotnet.exe on windows
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var executable = Path.DirectorySeparatorChar == '\\' ? "dotnet.exe" : "dotnet";
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try
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{
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// 1. Try to check which `dotnet` instance launched the current application
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string mainModulePath = Process.GetCurrentProcess().MainModule?.FileName;
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if (!string.IsNullOrWhiteSpace(mainModulePath) &&
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Path.GetFileName(mainModulePath).Equals(executable, StringComparison.OrdinalIgnoreCase))
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{
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return mainModulePath;
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}
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}
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catch
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{
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// ignore potential permission errors
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}
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try
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{
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// 2. Find dotnet based on runtime information
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var runtime = RuntimeEnvironment.GetRuntimeDirectory();
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if (!string.IsNullOrWhiteSpace(runtime) && Directory.Exists(runtime))
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{
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var dir = new DirectoryInfo(runtime);
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while (dir != null)
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{
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var candidate = System.IO.Path.Combine(dir.FullName, executable);
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if (File.Exists(candidate))
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{
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return candidate;
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}
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dir = dir.Parent;
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}
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}
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}
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catch
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{
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// ignore
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}
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return "dotnet";
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}
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[MethodImpl(MethodImplOptions.NoInlining)]
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static string GetOpenTapDllLocation() => Path.GetDirectoryName(typeof(PluginSearcher).Assembly.Location);
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}
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}
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