Control VPN Connections Through IIS

Using IIS as a service provider, you can call Windows internal Rasdial system to connect, disconnect, and check the status of VPN connections.

Rasdial.exe (http://technet.microsoft.com/en-us/library/ff859533(v=ws.10)) is an internal program which Windows uses to create VPN connections. It’s command line interface can also be used to disconnect a connection or check what connections are currently active. This is a small wrapper website that calls Rasdial, in order to handle VPN connections from a remote location through http.

To set this up, you’ll need an ASP.NET MVC website, and a few changes. This example is using IIS 7.5, ASP.NET MVC 4, on .NET 4.5.

Once the basic ASP.NET MVC website is created, the updates are:

1) Change the Default route:

1	routes.MapRoute(<br>    name: "Default", <br>    url: "{action}/{id}", <br>    defaults: new { controller = "Vpn", action = "Disconnect", id = UrlParameter.Optional } <br>);

2) Add a VpnController for the default route to use:

1

using System;   <br>using System.Collections.Generic;   <br>using System.Diagnostics;   <br>using System.Linq;   <br>using System.Timers;   <br>using System.Web;   <br>using System.Web.Mvc; <br>namespace mpfiles.VpnReset.Controllers   <br>{   <br>    public class VpnController : Controller   <br>    {   <br>        private const string DefaultName = "vpn connection name";<br><br>        public ActionResult Disconnect(string name = DefaultName) <br>        {   <br>            var arguments = string.Format("\"{0}\" /d", name);   <br>            return HandleRasDial(arguments);   <br>        }<br><br>        public ActionResult Connect(   <br>            string name = DefaultName,   <br>            string username = "username",   <br>            string password = "password"   <br>        ) {   <br>            var arguments = string.Format("\"{0}\" {1} {2}", name, username, password);   <br>            return HandleRasDial(arguments);   <br>        }<br><br>        public ActionResult Status(string name = DefaultName)  <br>        {   <br>            return HandleRasDial(string.Empty);   <br>        }<br><br>        public ActionResult HandleRasDial(string arguments)  <br>        {   <br>            var startTime = DateTime.Now;   <br>            var message = RasDial(arguments);   <br>            message = message.Replace("\n", "<br />");   <br>            var endTime = DateTime.Now;   <br>            message += "<br />" + String.Format("[{0}]", (endTime - startTime));<br><br>            return new ContentResult { Content = message };  <br>        }<br><br>        public string RasDial(string arguments)   <br>        {   <br>            var proc = new Process();<br><br>            proc.StartInfo.FileName = "rasdial";   <br>            proc.StartInfo.WorkingDirectory = HttpContext.Request.PhysicalApplicationPath;   <br>            proc.StartInfo.Arguments = arguments;   <br>            proc.StartInfo.RedirectStandardError = true;   <br>            proc.StartInfo.RedirectStandardOutput = true;   <br>            proc.StartInfo.UseShellExecute = false;   <br>            proc.StartInfo.CreateNoWindow = true;   <br>            proc.EnableRaisingEvents = false;<br><br>            proc.Start();   <br>            var output = proc.StandardOutput.ReadToEnd();   <br>            output += proc.StandardError.ReadToEnd();   <br>            proc.WaitForExit();   <br>            proc.Dispose();<br><br>            return output;   <br>        }<br><br>    }   <br>} <br><br>  <br>

I hope someone else will find this useful.