using System.Net;
using System.Net.Sockets;

namespace IP_port_checker.PortScanner
{
    public class TCPChecker
    {
        private static async Task<bool> IsPortOpen(IPAddress ip, int port)
        {
            try
            {
                using var tcp = new TcpClient();
                var task = tcp.ConnectAsync(ip, port);
                var timeout = Task.Delay(500);
                if (await Task.WhenAny(task, timeout) == task)
                {
                    return true;
                }
                return false;
            }
            catch
            {
                return false;
            }
        }

        public static async Task ScanPort(IPAddress ip, int stport, int endport)
        {
            var tasks = new List<Task<bool>>();

            for (int port = stport; port <= endport; port++)
            {
                tasks.Add(IsPortOpen(ip, port));
            }

            bool[] res = await Task.WhenAll(tasks);

            for (int i = 0; i < res.Length; i++)
                if (res[i])
                    Console.WriteLine($"[{DateTime.Now:HH:mm.ss.ffff}] Порт {stport + i} открыт");

            Console.WriteLine();
        }
    }
}
//127.0.0.1