portscan.java

import java.net.*;
import java.io.File;  // Import the File class
import java.io.IOException;  // Import the IOException class to handle errors
import java.io.FileWriter;   // Import the FileWriter class

public class portscan {
	 public static void scan(final int min, final int max) {
       final String nomefile = "nkscan-" + min + "-" + max + "range" + ".txt";
       try {
         final File myObj = new File(nomefile);
         if (myObj.createNewFile()) {
           System.out.println("File created: " + myObj.getName());
         } else {
           System.out.println("File already exists.");
         }
       } catch (final IOException e) {
         System.out.println("An error occurred.");
         e.printStackTrace();
       }
       for (int ip2 = 176; ip2 <= 179; ip2++) {
       for (int ip = 1; ip <= 254; ip++) {
         System.out.println("Scanning DPRK host 175.45."+ip2+"."+ ip);
         //final int[] ports = { 80, 8080 };
         for (int port = min; port <= max; port++) {
           try {
             System.out.println("Scanning on port: " + port);
             final Socket socket = new Socket();
             final String target = "175.45."+ip2+"."+ ip;
             socket.connect(new InetSocketAddress(target, port), 1000);
             socket.close();
             System.out.println("Service found on " + target);
             try {
               final FileWriter myWriter = new FileWriter(nomefile, true);
               if (port == 25) {
                 myWriter.write("SMTP found on " + target + ":" + port + "\n");
               } else if (port == 21) {
                 myWriter.write("FTP found on " + target + ":" + port + "\n");
               } else if (port == 80 || port == 8080) {
                 myWriter.write("Webserver found on " + target + ":" + port + "\n");
               } else if (port == 5900 || port == 5901) {
                 myWriter.write("VNC found on " + target + ":" + port + "\n");
               } else {
                 myWriter.write("Service found on " + target + ":" + port + "\n");
               }
               myWriter.close();
             } catch (final IOException e) {
               System.out.println("An error occurred.");
               e.printStackTrace();
             }
             // System.out.println("Port " + port + " is open on " + target);
           } catch (final Exception ex) {
	        }
	      }
	   }
    }
  }
}