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How to detect if a running Windows application is being accessed remotely?

Posted on 2013-11-06
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Last Modified: 2013-11-15
Hi Experts,

I am looking for a way to detect if my running vb.net Windows Forms application is being accessed remotely via software such as Remote Desktop, VNC, Teamviewer etc.

Regards,
Leigh
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Question by:LeighWardle
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6 Comments
 
LVL 24

Expert Comment

by:chaau
ID: 39629238
There is a Win32 API that is designed for this:
GetSystemMetrics(SM_REMOTESESSION);

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When the program running in a remote desktop session the API will return not zero value.
Please check this web-site how to call this API via PInvoke:
Public Declare Auto Function GetSystemMetrics Lib "user32.dll" (ByVal smIndex As Integer) As Integer

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Accepted Solution

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SAMIR BHOGAYTA earned 250 total points
ID: 39638009
hi... Try this

using System.Runtime.InteropServices;


 public class RemoteSessionChecker
  {
    /// <summary>
    /// Checks whether the current user is is logged in through a remote session
    /// </summary>
    /// <returns></returns>
    public static bool Check()
    {
      bool IsRemoteSession = false;
      //Constant used to check for remote sessions
      const int SM_REMOTESESSION = 0x2001;
      //This function will return 0 if the session is local
      int Value = GetSystemMetrics(SM_REMOTESESSION);

      IsRemoteSession = (Value != 0);

      return IsRemoteSession;
    }

    [DllImport("user32.dll", EntryPoint = ("GetSystemMetrics"))]
    private static extern int GetSystemMetrics(int nIndex);
  }
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Author Comment

by:LeighWardle
ID: 39640517
Hi samirbhogayta,  thanks for your suggestion.

I am not a c## developer, so I converted your code to vb.net:

Imports System.Runtime.InteropServices

Public Class RemoteSessionChecker
	''' <summary>
	''' Checks whether the current user is is logged in through a remote session
	''' </summary>
	''' <returns></returns>
	Public Shared Function Check() As Boolean
		Dim IsRemoteSession As Boolean = False
		'Constant used to check for remote sessions
		Const  SM_REMOTESESSION As Integer = &H2001
		'This function will return 0 if the session is local
		Dim Value As Integer = GetSystemMetrics(SM_REMOTESESSION)

		IsRemoteSession = (Value <> 0)

		Return IsRemoteSession
	End Function

	<DllImport("user32.dll", EntryPoint := ("GetSystemMetrics"))> _
	Private Shared Function GetSystemMetrics(nIndex As Integer) As Integer
	End Function
End Class

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But the function always returns False - even when I am connected by RDP.

Regards,
Leigh
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LVL 24

Assisted Solution

by:chaau
chaau earned 250 total points
ID: 39640547
SM_REMOTESESSION value is 0x1000, or converting to VB it is &H1000
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LVL 1

Author Comment

by:LeighWardle
ID: 39640593
Thanks, chaau.

Changing SM_REMOTESESSION value (for VB) to &H1000 now makes the code detect if it is connected by RDP.
That's the good news.

The bad news is that it does not detect if it is connected via TeamViewer.  (I haven't tried VNC or anything else).
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LVL 24

Expert Comment

by:chaau
ID: 39640648
Teamviewer, Logmein and such technically do not work via RDP, but connect to the user session. They cannot be detected via SM_REMOTESESSION. You will need to test if processes associated with these services are running using CreateToolhelp32Snapshot() API.
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