WindowsProcessFeatures.cs

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using BetterWin32Errors;
using Microsoft.Extensions.Logging;
using System;
using System.Diagnostics;
using System.Linq;
using System.Management;
using System.Threading;
using System.Threading.Tasks;

namespace Tgstation.Server.Host.System
{
    sealed class WindowsProcessFeatures : IProcessFeatures
    {
        readonly ILogger<WindowsProcessFeatures> logger;

        public WindowsProcessFeatures(ILogger<WindowsProcessFeatures> logger)
        {
            this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        public void ResumeProcess(global::System.Diagnostics.Process process)
        {
            if (process == null)
                throw new ArgumentNullException(nameof(process));

            try
            {
                foreach (ProcessThread thread in process.Threads)
                {
                    var pOpenThread = NativeMethods.OpenThread(NativeMethods.ThreadAccess.SuspendResume, false, (uint)thread.Id);
                    if (pOpenThread == IntPtr.Zero)
                        continue;

                    if (NativeMethods.ResumeThread(pOpenThread) == UInt32.MaxValue)
                        throw new Win32Exception();

                    NativeMethods.CloseHandle(pOpenThread);
                }

                logger.LogTrace("Resumed PID {0}", process.Id);
            }
            catch (Exception e)
            {
                logger.LogError(e, "Failed to resume PID {0}!", process.Id);
                throw;
            }
        }

        public void SuspendProcess(global::System.Diagnostics.Process process)
        {
            if (process == null)
                throw new ArgumentNullException(nameof(process));

            try
            {
                foreach (ProcessThread thread in process.Threads)
                {
                    var pOpenThread = NativeMethods.OpenThread(NativeMethods.ThreadAccess.SuspendResume, false, (uint)thread.Id);
                    if (pOpenThread == IntPtr.Zero)
                        continue;

                    if (NativeMethods.SuspendThread(pOpenThread) == UInt32.MaxValue)
                        throw new Win32Exception();

                    NativeMethods.CloseHandle(pOpenThread);
                }

                logger.LogTrace("Suspended PID {0}", process.Id);
            }
            catch (Exception e)
            {
                logger.LogError(e, "Failed to suspend PID {0}!", process.Id);
                throw;
            }
        }

        public Task<string> GetExecutingUsername(global::System.Diagnostics.Process process, CancellationToken cancellationToken)
        {
            string query = $"SELECT * FROM Win32_Process WHERE ProcessId = {process?.Id ?? throw new ArgumentNullException(nameof(process))}";
            using var searcher = new ManagementObjectSearcher(query);
            foreach (ManagementObject obj in searcher.Get())
            {
                var argList = new string[] { String.Empty, String.Empty };
                var returnString = obj.InvokeMethod(
                    "GetOwner",
                    argList)
                    ?.ToString();

                if (!Int32.TryParse(returnString, out var returnVal))
                    return Task.FromResult($"BAD RETURN PARSE: {returnString}");

                if (returnVal == 0)
                {
                    // return DOMAIN\user
                    string owner = argList.Last() + "\\" + argList.First();
                    return Task.FromResult(owner);
                }
            }

            return Task.FromResult("NO OWNER");
        }
    }
}