{

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Configuration;

using System.Data;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Management.Automation;

using System.Management.Automation.Runspaces;

using System.Net;

using System.ServiceProcess;

using System.Text;

using System.Threading;

/// <summary>

/// The Firewall Service

/// </summary>

public partial class Service1 : ServiceBase

{

/// <summary>

/// The last IP address found

/// </summary>

private string lastIPAddress = string.Empty;

/// <summary>

/// Configuration Settings Object

/// </summary>

private ConfigurationSettings config;

/// <summary>

/// The timer which fires to check the IP Address

/// </summary>

private System.Timers.Timer timer1;

/// <summary>

/// A mutex object

/// </summary>

private Mutex mutex;

/// <summary>

/// Initializes a new instance of the <see cref="Service1"/> class.

/// </summary>

public Service1()

{

InitializeComponent();

}

/// <summary>

/// When implemented in a derived class, executes when a Start command is sent to the service by the Service Control Manager (SCM) or when the operating system starts (for a service that starts automatically). Specifies actions to take when the service starts.

/// </summary>

/// <param name="args">Data passed by the start command.</param>

protected override void OnStart(string[] args)

{

System.Configuration.AppSettingsReader appReader = new System.Configuration.AppSettingsReader();

this.timer1 = new System.Timers.Timer(Convert.ToDouble(appReader.GetValue("Interval", typeof(string))));

FileSystemWatcher watcher = new FileSystemWatcher();

watcher.Path = System.AppDomain.CurrentDomain.BaseDirectory;

/* Watch for changes in LastAccess and LastWrite times, and

the renaming of files or directories. */

watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite

| NotifyFilters.FileName | NotifyFilters.DirectoryName;

// Only watch text files.

watcher.Filter = "*.config";

// Add event handlers.

watcher.Changed += new FileSystemEventHandler(OnChanged);

// Begin watching.

watcher.EnableRaisingEvents = true;

this.mutex = new Mutex(false);

this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.Timer1_Elapsed);

this.timer1.Start();

string ipToAdd = appReader.GetValue("Host", typeof(string)).ToString();

EventLog.WriteEntry("Firewall Updater monitoring host '" + ipToAdd + "'");

}

/// <summary>

/// When implemented in a derived class, executes when a Stop command is sent to the service by the Service Control Manager (SCM). Specifies actions to take when a service stops running.

/// </summary>

protected override void OnStop()

{

EventLog.WriteEntry("Firewall Updater exiting.");

}

/// <summary>

/// Called when [changed].

/// </summary>

/// <param name="source">The source.</param>

/// <param name="e">The <see cref="System.IO.FileSystemEventArgs"/> instance containing the event data.</param>

private static void OnChanged(object source, FileSystemEventArgs e)

{

ConfigurationManager.RefreshSection("appSettings");

}

/// <summary>

/// Handles the Elapsed event of the Timer1 control.

/// </summary>

/// <param name="sender">The source of the event.</param>

/// <param name="e">The <see cref="System.Timers.ElapsedEventArgs"/> instance containing the event data.</param>

private void Timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)

{

this.mutex.WaitOne();

try

{

// EventLog.WriteEntry("Tick");

System.Configuration.AppSettingsReader appReader = new System.Configuration.AppSettingsReader();

string ipToAdd = appReader.GetValue("Host", typeof(string)).ToString();

IPAddress[] addresslist = Dns.GetHostAddresses(ipToAdd);

if (addresslist.Length > 0)

{

if (this.lastIPAddress != addresslist[0].ToString())

{

this.RunScript("netsh advfirewall firewall delete rule name=\"" + appReader.GetValue("RuleName", typeof(string)).ToString() + "\" protocol=TCP");

string scripttext = "netsh advfirewall firewall add rule name=\"" + appReader.GetValue("RuleName", typeof(string)).ToString() + "\" dir=in action=allow protocol=TCP remoteip=" + addresslist[0];

this.RunScript(scripttext);

EventLog.WriteEntry("Changed firewall rule for RDP. New IP Address: " + addresslist[0]);

this.lastIPAddress = addresslist[0].ToString();

}

}

}

finally

{

this.mutex.ReleaseMutex();

}

}

/// <summary>

/// Runs the script.

/// </summary>

/// <param name="scriptText">The script text.</param>

/// <returns>The output of the script run</returns>

private string RunScript(string scriptText)

{

// create Powershell runspace

Runspace runspace = RunspaceFactory.CreateRunspace();

// open it

runspace.Open();

// create a pipeline and feed it the script text

Pipeline pipeline = runspace.CreatePipeline();

pipeline.Commands.AddScript(scriptText);

pipeline.Commands.Add("Out-String");

// execute the script

Collection<PSObject> results = pipeline.Invoke();

// close the runspace

runspace.Close();

// convert the script result into a single string

StringBuilder stringBuilder = new StringBuilder();

foreach (PSObject obj in results)

{

stringBuilder.AppendLine(obj.ToString());

}

return stringBuilder.ToString();

}

}