RemoteView/Program.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Reflection;
using System.Security.Principal;
using System.Threading;
using System.Windows.Forms;

namespace RemoteView
{
    class Program
    {
        static Mutex mutex = new Mutex(true, "-RemoteView-Mutex-");

        private static string ApplicationName
        {
            get
            {
                return Path.GetFileNameWithoutExtension(Application.ExecutablePath);
            }
        }

        static void Main(string[] args)
        {

            // get configuration from command line parameters

            Configuration conf;
            try
            {
                conf = Configuration.create(args);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return;
            }

            if (conf.Banner)
            {
                ShowBanner();
            }

            if (conf.Help)
            {
                ShowHelpMessage();
                return;
            }

            // make sure only one instance is online

            if (!conf.AllowMultiple && !InstanceIsUnique())
            {
                Console.WriteLine("Only one instance of process allowed. User -m for muliple instances.");
                return;
            }

            // get admin level

            if (!IsRunningAsAdministrator())
            {
                RunAsAdministrator(args);
                return;
            }

            // check if http listener is supported

            if (!HttpListener.IsSupported)
            {
                Console.WriteLine("Windows XP SP2 or Server 2003 is required to use the HttpListener class.");
                return;
            }

            // run server
            RunServer(conf);
        }

        /// <summary>
        /// Find out if there are one or more instances of this program running
        /// </summary>
        /// <returns>n processes</returns>
        private static bool InstanceIsUnique()
        {
            if (mutex.WaitOne(TimeSpan.Zero, true))
            {
                mutex.ReleaseMutex();
                return true;
            }
            return false;
        }

        /// <summary>
        /// Relaunch this Application with Admin user level if possible
        /// </summary>
        /// <param name="args"></param>
        private static void RunAsAdministrator(string[] args)
        {
            ProcessStartInfo processInfo = new ProcessStartInfo(Assembly.GetExecutingAssembly().CodeBase);
            processInfo.UseShellExecute = true;
            processInfo.Verb = "runas";
            processInfo.Arguments = String.Join(" ", args);

            try
            {
                Process.Start(processInfo);
            }
            catch (Exception)
            {
                Console.WriteLine("Needs administrator rights.");
            }
        }

        /// <summary>
        /// Run server
        /// </summary>
        /// <param name="conf">server configuration</param>
        private static void RunServer(Configuration conf)
        {
            Server server = new Server();

            new Thread(() =>
            {
                server.Start(conf.Port);
            }).Start();

            // works!
            Thread.Sleep(2000);

            if (!server.IsRunning())
            {
                Console.WriteLine("Could not start server... Exiting.");
                return;
            }

            Console.WriteLine("Server running press [c] to stop");
            while (server.IsRunning() && Console.ReadKey(true).Key != ConsoleKey.C) ;
            server.Stop();
        }

        private static void ShowBanner()
        {
            Console.WriteLine(Application.ProductName + " - Desktop sharing server");
            Console.WriteLine("Copyright (c) Joao Vilaca, 2013, Email: jvilaca@gmail.com");
            Console.WriteLine();
        }

        private static void ShowHelpMessage()
        {
            Console.WriteLine("Syntax: " + ApplicationName + " [Port to listen] [Options]");
            Console.WriteLine("Example: " + ApplicationName + " 6060 -b");
            Console.WriteLine("Options: -b :\tDon't show banner message;");
            Console.WriteLine("         -h :\tHelp (This screen);");
            //            Console.WriteLine("\t-i :\tInstall as Windows service");
            //            Console.WriteLine("\t-u :\tUninstall as Windows service");
        }

        private static bool IsRunningAsAdministrator()
        {
            return new WindowsPrincipal(WindowsIdentity.GetCurrent()).IsInRole(WindowsBuiltInRole.Administrator);
        }
    }
}