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:

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

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

using System;   
using System.Collections.Generic;   
using System.Diagnostics;   
using System.Linq;   
using System.Timers;   
using System.Web;   
using System.Web.Mvc; 
namespace mpfiles.VpnReset.Controllers   
{   
    public class VpnController : Controller   
    {   
        private const string DefaultName = "vpn connection name";

        public ActionResult Disconnect(string name = DefaultName) 
        {   
            var arguments = string.Format("\"{0}\" /d", name);   
            return HandleRasDial(arguments);   
        }

        public ActionResult Connect(   
            string name = DefaultName,   
            string username = "username",   
            string password = "password"   
        ) {   
            var arguments = string.Format("\"{0}\" {1} {2}", name, username, password);   
            return HandleRasDial(arguments);   
        }

        public ActionResult Status(string name = DefaultName)  
        {   
            return HandleRasDial(string.Empty);   
        }

        public ActionResult HandleRasDial(string arguments)  
        {   
            var startTime = DateTime.Now;   
            var message = RasDial(arguments);   
            message = message.Replace("\n", "<br />");   
            var endTime = DateTime.Now;   
            message += "<br />" + String.Format("[{0}]", (endTime - startTime));

            return new ContentResult { Content = message };  
        }

        public string RasDial(string arguments)   
        {   
            var proc = new Process();

            proc.StartInfo.FileName = "rasdial";   
            proc.StartInfo.WorkingDirectory = HttpContext.Request.PhysicalApplicationPath;   
            proc.StartInfo.Arguments = arguments;   
            proc.StartInfo.RedirectStandardError = true;   
            proc.StartInfo.RedirectStandardOutput = true;   
            proc.StartInfo.UseShellExecute = false;   
            proc.StartInfo.CreateNoWindow = true;   
            proc.EnableRaisingEvents = false;

            proc.Start();   
            var output = proc.StandardOutput.ReadToEnd();   
            output += proc.StandardError.ReadToEnd();   
            proc.WaitForExit();   
            proc.Dispose();

            return output;   
        }

    }   
} 

  

I hope someone else will find this useful.