Source code for wanip.cs

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namespace RobvanderWoude
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{
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	class WANIP
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	{
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		static string progver = "1.03";
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		static int Main( string[] args )
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		{
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			// These are the URLs the program uses to try and get the computer's WAN IP address; if

			// a site fails, the next one is tried; if all fail, their error messages are displayed

			string[] urls = { "https://www.robvanderwoude.com/wanip.php", "https://www.robvanderwoude.net/wanip.php", "http://automation.whatismyip.com/n09230945.asp" };

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			if ( args.Length == 0 )
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			{
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				bool found = false;
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				string errormessage = System.String.Empty;

				string ipPattern = @"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$";

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				string wanip = System.String.Empty;
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				// The next couple of ServicePointManager lines are required for secure connections only

				System.Net.ServicePointManager.Expect100Continue = true;

				System.Net.ServicePointManager.SecurityProtocol |= System.Net.SecurityProtocolType.Tls12;

				System.Net.ServicePointManager.SecurityProtocol |= System.Net.SecurityProtocolType.Ssl3;

				System.Net.WebClient myWebClient = new System.Net.WebClient( );

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				foreach ( string url in urls )
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				{
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					if ( !found )
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					{
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						try
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						{
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							System.IO.Stream myStream = myWebClient.OpenRead( url );

							System.IO.StreamReader myStreamReader = new System.IO.StreamReader( myStream );

							wanip = myStreamReader.ReadToEnd( );

							if ( System.Text.RegularExpressions.Regex.IsMatch( wanip, ipPattern ) )

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							{
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								System.Console.WriteLine( wanip );

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								found = true;
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							}
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							else
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							{
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								errormessage += System.String.Format( "\n\nThe URL did not return a valid IP address: {0}", url );

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							}
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						}
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						catch ( System.Exception e )
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						{
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							errormessage += System.String.Format( "\n\n{0} ({1})", e.Message, url );

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						}
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					}
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				}
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				if ( found )
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				{
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					return 0;
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				}
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				else
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				{
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					if ( !System.String.IsNullOrEmpty( errormessage ) )

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					{
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						System.Console.Error.WriteLine( errormessage );

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					}
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					return 1;
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				}
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			}
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			else
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			{
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				System.Console.Error.WriteLine( );
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				System.Console.Error.WriteLine( "WANIP.exe,  Version {0}", progver );

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				System.Console.Error.WriteLine( "Return the computer's WAN IP address" );

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				System.Console.Error.WriteLine( );
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				System.Console.Error.WriteLine( "Usage:  WANIP" );

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				System.Console.Error.WriteLine( );
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				System.Console.Error.WriteLine( "Note:   The program tries {0} different URLs to get the WAN IP address", urls.Length );

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				System.Console.Error.WriteLine( );
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				System.Console.Error.WriteLine( "Written by Rob van der Woude" );

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				System.Console.Error.WriteLine( "https://www.robvanderwoude.com" );

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				return 1;
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			}
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		}
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	}
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}
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```