philipmur / c-sharp-multi-threaded-port-scanner Goto Github PK

Hi mate.

I was able to get 300-500 threads going (depends on the system - specify 500, .net may only open 300)
I believe ports were not being cleaned up perhaps.
Much less cpu - and a quicker finish.

In PortScanner.start

• ThreadPool.SetMaxThreads(threadCounter, threadCounter);
  

•    for (int i = 0; i < threadCounter; i++)
       {
           if (!portList.MorePorts())
               return;
  

In RunScanTcp

• Thread.Seep(100)` //quicker, more threads, than 1ms
  

•             var con = Connect(host, port, tcpTimeout);
               if (con != null)
               {
                   con.Close();
                   Console.ForegroundColor = ConsoleColor.Green;
                   Console.WriteLine("TCP Port {0} is open ", port);
               }
  

In Connect

• Instead of throw Exception

  newClient.Close();
  return null;
  

PortList

• private Object threadLock = new Object();
  

• public bool MorePorts()
   {
       lock (threadLock) return (stop - ports) >= 0;
   }
   public int NextPort()
   {
       lock (threadLock)
       {
           if (MorePorts())
           {
               return ports++;
           }
       }
       return -1;
   }