using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
namespace VPN
{
/// <summary>
/// Class to maintain connectivity to a specific VPN connection
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public class VPNS
{
#region --Const--
/// <summary>
/// Where the rasphone.exe lives
/// </summary>
private const string VPNPROCESS = "C:\\WINDOWS\\system32\\rasphone.exe";
#endregion
#region --Fields--
/// <summary>
/// Internal variable for VPNConnectionName
/// </summary>
private string _VPNConnectionName = "";
/// <summary>
/// Internal variable for IPToPing
/// </summary>
private string _IPToPing = "";
/// <summary>
/// Internal variable for IsConnected
/// </summary>
private bool _isConnected = false;
/// <summary>
/// Timer that manages the Manage function
/// </summary>
private System.Timers.Timer MonitorTimer;
/// <summary>
/// Bool to flag if the system is currently checking for network validity
/// </summary>
private bool _isChecking = false;
/// <summary>
/// Bool to flag if the system is currently in a Manage loop
/// </summary>
private bool _isManaging = false;
#endregion
#region --Events--
public delegate void PingingHandler();
public delegate void ConnectingHandler();
public delegate void DisconnectingHandler();
public delegate void IdleHandler();
public delegate void ConnectionStatusChangedHandler(bool Connected);
/// <summary>
/// Fires when validating connectivity
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public event PingingHandler Pinging;
/// <summary>
/// Fired when it is trying to connect to the VPN
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public event ConnectingHandler Connecting;
/// <summary>
/// Fired when it is trying to disconnect from the VPN
/// </summary>
public event DisconnectingHandler Disconnecting;
/// <summary>
/// Fired when it is done working for the moment
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public event IdleHandler Idle;
/// <summary>
/// Fired when the IsConnected Property changes
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public event ConnectionStatusChangedHandler ConnectionStatusChanged;
/// <summary>
/// Call to raise Pinging event
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
protected void OnPinging()
{
if (Pinging != null)
{
Pinging();
}
}
/// <summary>
/// Call to raise Connecting event
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
protected void OnConnecting()
{
if (Connecting != null)
{
Connecting();
}
}
/// <summary>
/// Call to raise Disconnecting event
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
protected void OnDisconnecting()
{
if (Disconnecting != null)
{
Disconnecting();
}
}
/// <summary>
/// Call to raise Idle event
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
protected void OnIdle()
{
if (Idle != null)
{
Idle();
}
}
/// <summary>
/// Call to raise ConnectionStatusChanged event
/// </summary>
/// <param name="Connected">If connected to network</param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
protected void OnConnectionStatusChanged(bool Connected)
{
if (ConnectionStatusChanged != null)
{
ConnectionStatusChanged(Connected);
}
}
#endregion
#region --Properties--
/// <summary>
/// Returns if you are connected to the network
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public bool IsConnected
{
get { return _isConnected; }
}
/// <summary>
/// IP to ping to validate connectivity
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public string IPToPing
{
get { return _IPToPing; }
set { _IPToPing = value; }
}
/// <summary>
/// Name of VPN connection as seen in network connections (not case sensitive)
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public string VPNConnectionName
{
get { return _VPNConnectionName; }
set { _VPNConnectionName = value; }
}
#endregion
#region --Private Methods--
/// <summary>
/// Pings the provided IP to validate connection
/// </summary>
/// <returns>True if you are connected</returns>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public bool TestConnection()
{
bool RV = false;
_isChecking = true;
try
{
OnPinging();
System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping();
if (ping.Send(_IPToPing).Status == System.Net.NetworkInformation.IPStatus.Success)
{
RV = true;
}
else
{
RV = false;
}
ping = null;
if (RV != _isConnected)
{
_isConnected = RV;
OnConnectionStatusChanged(_isConnected);
}
OnIdle();
}
catch (Exception Ex)
{
Debug.Assert(false, Ex.ToString());
RV = false;
OnIdle();
}
_isChecking = false;
return RV;
}
/// <summary>
/// Shells the command to connect to the VPN
/// </summary>
/// <returns>True if connected</returns>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
private bool ConnectToVPN()
{
bool RV = false;
try
{
OnConnecting();
Process.Start(VPNPROCESS, " -d " + _VPNConnectionName);
System.Windows.Forms.Application.DoEvents();
System.Threading.Thread.Sleep(5000);
System.Windows.Forms.Application.DoEvents();
RV = true;
OnIdle();
}
catch (Exception Ex)
{
Debug.Assert(false, Ex.ToString());
RV = false;
OnIdle();
}
return RV;
}
/// <summary>
/// Shells the command to disconnect from the VPN connection
/// </summary>
/// <returns>True if successfully disconnected</returns>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
private bool DisconnectFromVPN()
{
bool RV = false;
try
{
OnDisconnecting();
System.Diagnostics.Process.Start(VPNPROCESS, " -h " + _VPNConnectionName);
System.Windows.Forms.Application.DoEvents();
System.Threading.Thread.Sleep(8000);
System.Windows.Forms.Application.DoEvents();
RV = true;
OnIdle();
}
catch (Exception Ex)
{
Debug.Assert(false, Ex.ToString());
RV = false;
OnIdle();
}
return RV;
}
/// <summary>
/// Handles the grunt work.
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
private void Manage()
{
try
{
if (!_isManaging)
{
_isManaging = true;
if (!_isChecking)
{
if (!TestConnection())
{
ConnectToVPN();
if (!TestConnection())
{
DisconnectFromVPN();
ConnectToVPN();
if (!TestConnection())
{
DisconnectFromVPN();
ConnectToVPN();
}
}
}
}
_isManaging = false;
}
}
catch (Exception)
{
_isManaging = false;
}
}
#endregion
#region --Public Methods--
/// <summary>
/// Overloaded end point to begin monitoring VPN status
/// </summary>
/// <param name="VPNName">Name of VPN connection as seen in network connections (not case sensitive)</param>
/// <param name="IPtoPing">IP to ping to validate connectivity</param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public void StartManaging(string VPNName, string IPtoPing)
{
_VPNConnectionName = VPNName;
_IPToPing = IPtoPing;
StartManaging();
}
/// <summary>
/// End point to begin monitoring VPN status
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public void StartManaging()
{
if (!string.IsNullOrEmpty(_VPNConnectionName) & !string.IsNullOrEmpty(_IPToPing))
{
MonitorTimer = new System.Timers.Timer(15000);
MonitorTimer.Enabled = true;
MonitorTimer.Elapsed += new System.Timers.ElapsedEventHandler(MonitorTimer_Elapsed);
System.Net.NetworkInformation.NetworkChange.NetworkAvailabilityChanged += new System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);
Microsoft.Win32.SystemEvents.PowerModeChanged += new Microsoft.Win32.PowerModeChangedEventHandler(SystemEvents_PowerModeChanged);
Manage();
}
}
#endregion
#region --Constructors--
/// <summary>
/// Overloaded constructor
/// </summary>
/// <param name="VPNName">Name of VPN connection as seen in network connections (not case sensitive)</param>
/// <param name="IPtoPing">IP to ping to validate connectivity</param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public VPNS(string VPNName, string IPtoPing)
{
StartManaging(VPNName, IPtoPing);
}
/// <summary>
/// Default empty constructor
/// </summary>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
public VPNS()
{
}
#endregion
#region --Event Handlers--
/// <summary>
/// Handles the event that is raised when the computer goes into, or comes out of, standby. Very useful for laptops
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
void SystemEvents_PowerModeChanged(object sender, Microsoft.Win32.PowerModeChangedEventArgs e)
{
if (e.Mode == Microsoft.Win32.PowerModes.Resume)
{
MonitorTimer.Stop();
System.Threading.Thread.Sleep(15000);
MonitorTimer.Start();
}
if (e.Mode == Microsoft.Win32.PowerModes.Suspend)
{
MonitorTimer.Stop();
}
}
/// <summary>
/// Handles the event that is raised when the network status changes
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
void NetworkChange_NetworkAvailabilityChanged(object sender, System.Net.NetworkInformation.NetworkAvailabilityEventArgs e)
{
if (e.IsAvailable)
{
if (!MonitorTimer.Enabled)
{
MonitorTimer.Start();
}
}
else
{
MonitorTimer.Stop();
}
}
/// <summary>
/// Handles the event the timer raises when it elapses
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <history>
/// [Tim Hibbard] 01/24/2007 Created
/// </history>
void MonitorTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
Manage();
}
#endregion
}
}
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