Humprey Evangelista Cogay : security

looping through an IP Address Range

Comgen — Tue, 12 Apr 2011 03:30:00 GMT

As a Security/Systems Administrator, one of my task is to scan for rouge devices, services and other status and/or information regarding our network. One of the major task is to know which hosts belongs to a specified IP Range for example 192.168.0.1 to 192.168.100.255.

One of the best solutions and probably the fastest is to convert the Ip range and iterate in its Binary form. With the help of shift operators (<< and >>), & and | operator here is my simple implementation in C# =)

-----------------------------------------------------------------
int counter;

int[] ipStart = {192,168,0,0};
int[] ipEnd = {192,168,255,255};

             int startIP= (
                ipStart[0] << 24 |
                ipStart[1] << 16 |
                ipStart[2] << 8 |
                ipStart[3]);

             int endIP= (
                ipEnd[0] << 24 |
                ipEnd[1] << 16 |
                ipEnd[2] << 8 |
                ipEnd[3]);

             for (counter = startIP; counter <= endIP; counter++)
             {
                 Console.WriteLine("{0}.{1}.{2}.{3}",
                            (counter & 0xFF000000) >> 24,
                            (counter & 0x00FF0000) >> 16,
                            (counter & 0x0000FF00) >> 8,
                            counter & 0x000000FF);
             }
-------------------------------------------------------------------------

           0xFF000000 is equal to 11111111000000000000000000000000 in Binary
            0x00FF0000 is equal to 00000000111111110000000000000000 in Binary
            0x0000FF00 is equal to 00000000000000001111111100000000 in Binary
            0x000000FF is equal to 00000000000000000000000011111111 in Binary

Till Next Time.......

Get the workstations Physical Address (MAC Address)

Comgen — Thu, 03 Jun 2010 23:19:00 GMT

I currently have a new project and as an additional security I want to get the workstations MAC address and store it in the Log..

Here's my solution which I based somewhere.....

            IPGlobalProperties NetworkProperties = IPGlobalProperties.GetIPGlobalProperties();
            NetworkInterface[] NetworkInterfaceCards= NetworkInterface.GetAllNetworkInterfaces();
            string macAddress = "";
            VeteransBankENT.ApplicationVariables.CurrentHostName = NetworkProperties.HostName;
            VeteransBankENT.ApplicationVariables.CurrentHostName = NetworkProperties.DomainName;

           if (NetworkInterfaceCards == null || NetworkInterfaceCards.Length < 1)
            {
                MessageBox.Show(" No network interfaces found.");
            }

            foreach (NetworkInterface adapter in NetworkInterfaceCards)
            {
                if (adapter.NetworkInterfaceType == NetworkInterfaceType.Ethernet && adapter.OperationalStatus == OperationalStatus.Up)
                {
                    IPInterfaceProperties properties = adapter.GetIPProperties(); // .GetIPInterfaceProperties();
                    PhysicalAddress address = adapter.GetPhysicalAddress();
                    byte[] bytes = address.GetAddressBytes();
                    for (int i = 0; i < bytes.Length; i++)
                    {
                         macAddress += bytes.ToString("X2");
                         if (i != bytes.Length - 1)
                        {
                            macAddress += "-";
                        }
                    }
                    VeteransBankENT.ApplicationVariables.CurrentHost = macAddress;
                    break;
                }
            }

Unify Windows Forms and ASP.NET Providers for Credentials Management

Comgen — Thu, 11 Dec 2008 03:24:00 GMT

I have coded several Windows Applications using .Net for the bank for the past years and one of the ussual task is to create the Login Form.

I have posted previously one of the solution I use in doing it (Use Membership API in winForms).

Browsing for new things to do I found this link on MSDN which I think is a better article to read Unify Windows Forms and ASP.NET Providers for Credentials Management

Hope to hear some comments or better solution from you guys.....