We help IT Professionals succeed at work.

C# to Log off Terminal Session

2,305 Views
Last Modified: 2013-01-21
I need a C# code that would log off a specific user from the terminal server. Can someone please help...
Comment
Watch Question

Manoj PatilTechnical Lead
CERTIFIED EXPERT

Commented:

Author

Commented:
Exactly,
Is there anyway I can hard code the domain admin credentials in the code so the program runs as domain administrator for permission issues? Please help!!!!

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    [StructLayout(LayoutKind.Sequential)]
    internal struct WTS_SESSION_INFO
    {
        public Int32 SessionID;
        [MarshalAs(UnmanagedType.LPStr)]
        public String pWinStationName;
        public WTS_CONNECTSTATE_CLASS State;
    }

    internal enum WTS_CONNECTSTATE_CLASS
    {
        WTSActive,
        WTSConnected,
        WTSConnectQuery,
        WTSShadow,
        WTSDisconnected,
        WTSIdle,
        WTSListen,
        WTSReset,
        WTSDown,
        WTSInit
    }

    internal enum WTS_INFO_CLASS
    {
        WTSInitialProgram,
        WTSApplicationName,
        WTSWorkingDirectory,
        WTSOEMId,
        WTSSessionId,
        WTSUserName,
        WTSWinStationName,
        WTSDomainName,
        WTSConnectState,
        WTSClientBuildNumber,
        WTSClientName,
        WTSClientDirectory,
        WTSClientProductId,
        WTSClientHardwareId,
        WTSClientAddress,
        WTSClientDisplay,
        WTSClientProtocolType,
        WTSIdleTime,
        WTSLogonTime,
        WTSIncomingBytes,
        WTSOutgoingBytes,
        WTSIncomingFrames,
        WTSOutgoingFrames,
        WTSClientInfo,
        WTSSessionInfo
    }

    class Program
    {
        [DllImport("wtsapi32.dll", SetLastError = true)]
        static extern bool WTSLogoffSession(IntPtr hServer, int SessionId, bool bWait);

        [DllImport("Wtsapi32.dll")]
        static extern bool WTSQuerySessionInformation(
            System.IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out System.IntPtr ppBuffer, out uint pBytesReturned);

        [DllImport("wtsapi32.dll", SetLastError = true)]
        static extern IntPtr WTSOpenServer([MarshalAs(UnmanagedType.LPStr)] String pServerName);

        [DllImport("wtsapi32.dll")]
        static extern void WTSCloseServer(IntPtr hServer);

        [DllImport("wtsapi32.dll", SetLastError = true)]
        static extern Int32 WTSEnumerateSessions(IntPtr hServer, [MarshalAs(UnmanagedType.U4)] Int32 Reserved, [MarshalAs(UnmanagedType.U4)] Int32 Version, ref IntPtr ppSessionInfo, [MarshalAs(UnmanagedType.U4)] ref Int32 pCount);

        [DllImport("wtsapi32.dll")]
        static extern void WTSFreeMemory(IntPtr pMemory);

        internal static List<int> GetSessionIDs(IntPtr server)
        {
            List<int> sessionIds = new List<int>();
            IntPtr buffer = IntPtr.Zero;
            int count = 0;
            int retval = WTSEnumerateSessions(server, 0, 1, ref buffer, ref count);
            int dataSize = Marshal.SizeOf(typeof(WTS_SESSION_INFO));
            Int64 current = (int)buffer;

            if (retval != 0)
            {
                for (int i = 0; i < count; i++)
                {
                    WTS_SESSION_INFO si = (WTS_SESSION_INFO)Marshal.PtrToStructure((IntPtr)current, typeof(WTS_SESSION_INFO));
                    current += dataSize;
                    sessionIds.Add(si.SessionID);
                }
                WTSFreeMemory(buffer);
            }
            return sessionIds;
        }

        internal static bool LogOffUser(string userName, IntPtr server)
        {

            userName = userName.Trim().ToUpper();
            List<int> sessions = GetSessionIDs(server);
            Dictionary<string, int> userSessionDictionary = GetUserSessionDictionary(server, sessions);
            if (userSessionDictionary.ContainsKey(userName))
                return WTSLogoffSession(server, userSessionDictionary[userName], true);
            else
                return false;
        }

        private static Dictionary<string, int> GetUserSessionDictionary(IntPtr server, List<int> sessions)
        {
            Dictionary<string, int> userSession = new Dictionary<string, int>();

            foreach (var sessionId in sessions)
            {
                string uName = GetUserName(sessionId, server);
                if (!string.IsNullOrWhiteSpace(uName))
                    userSession.Add(uName, sessionId);
            }
            return userSession;
        }

        internal static string GetUserName(int sessionId, IntPtr server)
        {
            IntPtr buffer = IntPtr.Zero;
            uint count = 0;
            string userName = string.Empty;
            try
            {
                WTSQuerySessionInformation(server, sessionId, WTS_INFO_CLASS.WTSUserName, out buffer, out count);
                userName = Marshal.PtrToStringAnsi(buffer).ToUpper().Trim();
            }
            finally
            {
                WTSFreeMemory(buffer);
            }
            return userName;
        }

        static void Main(string[] args)
        {
            string input = string.Empty;
            Console.Write("Enter ServerName<Enter 0 to default to local>:");
            input = Console.ReadLine();
            IntPtr server = WTSOpenServer(input.Trim()[0] == '0' ? Environment.MachineName : input.Trim());
            try
            {
                do
                {
                    Console.WriteLine("Please Enter L => list sessions, G => Logoff a user, END => exit.");
                    input = Console.ReadLine();
                    if (string.IsNullOrWhiteSpace(input))
                        continue;
                    else if (input.ToUpper().Trim()[0] == 'L')
                    {
                        Dictionary<string, int> userSessionDict = GetUserSessionDictionary(server, GetSessionIDs(server));
                        foreach (var userSession in userSessionDict)
                        {
                            Console.WriteLine(string.Format("{0} is logged in {1} session", userSession.Key, userSession.Value));
                        }
                    }
                    else if (input.ToUpper().Trim()[0] == 'G')
                    {
                        Console.Write("Enter UserName:");
                        input = Console.ReadLine();
                        LogOffUser(input, server);
                    }

                } while (input.ToUpper() != "END");
            }
            finally
            {
                WTSCloseServer(server);
            }
        }
    }
}

Open in new window

Technical Lead
CERTIFIED EXPERT
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
thanks....
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.