BlockIPAddr/Program.cs

using Microsoft.Data.SqlClient;
using BlockIPAddr.ClassObj;
using static BlockIPAddr.ClassObj.ANSI;

namespace BlockIPAddr;

internal class Program
{
  [STAThread]
  static void Main(string[] args)
  {
    ConsoleColorization.Initialize();   // Allow ANSI in the console

    if (args.Length > 0)
    {
      Console.WriteLine();
      using (var cn = new SqlConnection(kmCommonLibsCore.Constants.cnPortal))
      using (var cm = new SqlCommand("dbo.[BlockIPAddrInFirewall]", cn) { CommandType = System.Data.CommandType.StoredProcedure })
      {
        cn.Open();
        cm.Parameters.Add("@ip4", System.Data.SqlDbType.VarChar, 30);
        foreach (string arg in args)
        {
          string rv;
          string color = string.Empty;

          if (!IsValid(arg))
            Console.WriteLine("{0}ERROR: '{1}{2}{0}' is not a valid IP4 address.{3}", ANSI.fgBrightRed, ANSI.fgBrightWhite, arg.Trim(), ANSI.fgReset);
          else
          {
            cm.Parameters["@ip4"].Value = arg.Trim();
            rv = cm.ExecuteScalar().ToString() ?? string.Empty;

            color = rv.StartsWith("!!") ? ANSI.fgBrightRed : ANSI.fgBrightYellow;
            Console.WriteLine("Result: {1}{0}{2}", rv, color, ANSI.fgReset);
          }
        }
      }
    }
    else
    {
      while (true)
      {
        string? ip4 = string.Empty;
        Console.Write("\nEnter an IP Address to block (can include slash-notation) or Enter to Exit: ");
        ip4 = Console.ReadLine();
        if (string.IsNullOrWhiteSpace(ip4))
          break;

        if (!IsValid(ip4))
          Console.WriteLine("\n{0}ERROR: '{1}{2}{0}' is not a valid IP4 address.{3}", ANSI.fgBrightRed, ANSI.fgBrightWhite, ip4, ANSI.fgReset);
        else
        {
          using (var cn = new SqlConnection(kmCommonLibsCore.Constants.cnPortal))
          using (var cm = new SqlCommand("dbo.[BlockIPAddrInFirewall]", cn) { CommandType = System.Data.CommandType.StoredProcedure })
          {
            string color = string.Empty;
            string rv = string.Empty;
            cn.Open();
            cm.Parameters.Add("@ip4", System.Data.SqlDbType.VarChar, 30).Value = ip4;
            rv = cm.ExecuteScalar().ToString() ?? string.Empty;

            color = rv.StartsWith("!!") ? ANSI.fgBrightRed : ANSI.fgBrightYellow;
            Console.WriteLine("\nResult: {1}{0}{2}", rv, color, ANSI.fgReset);
          }
        }
      }
    }
  }

  static internal bool IsValid(string ip)
  {
    bool rv = false;

    try
    {
      if (ip.IndexOf('/') > 0)    // prevent it from being the first character
      {
        string[] part = ip.Split('/');

        if (part.Length != 2)
          rv = false;
        else
        {
          System.Net.IPAddress? ip4 = null;
          byte subMask = 0;

          if (System.Net.IPAddress.TryParse(part[0].Trim(), out ip4))
            rv = true;

          if (rv && byte.TryParse(part[1].Trim(), out subMask))
            rv = true;
          else
            rv = false;
        }
      }
      else
      {
        System.Net.IPAddress? ip4 = null;
        if (System.Net.IPAddress.TryParse(ip.Trim(), out ip4))
          rv = true;
        else
          rv = false;
      }
    }
    catch //(Exception)
    {
      rv = false;
    }

    return rv;
  }
}