import javax.imageio.*;
import java.awt.image.*;
import java.awt.*;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.util.concurrent.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;

public class main {
  static int threads = 10;
  static int timeout = 500; // SHOULD be enough...
  static String ip = "127.0.0.1";
  
  public static void main(String[] args) throws Exception {
    final ExecutorService es = Executors.newFixedThreadPool(threads);
    print("Port scanning " + ip + " with timeout " + timeout + " ms in " + threads + " threads.");
    startTiming();
    List<Future<Integer>> futures = new ArrayList<Future<Integer>>();
    for (int port = 1; port <= 65535; port++) {
      futures.add(portIsOpen(es, ip, port, timeout));
    }
    es.shutdown();
    List<Integer> openPorts = new ArrayList<Integer>();
    for (final Future<Integer> f : futures) {
      int port = f.get();
      if (port != 0)
        openPorts.add(port);
    }
    stopTiming();
    System.out.println("There are " + openPorts.size() + " open ports on host " + ip + ": " + structure(openPorts));
  }

  public static Future<Integer> portIsOpen(final ExecutorService es, final String ip, final int port, final int timeout) {
    return es.submit(new Callable<Integer>() {
        @Override public Integer call() {
          try {
            Socket socket = new Socket();
            socket.connect(new InetSocketAddress(ip, port), timeout);
            print("Connected to " + ip + ":" + port);
            socket.close();
            return port;
          } catch (Exception ex) {
            return 0;
          }
        }
     });
  }

static long startTiming_startTime;
static void startTiming() {
  startTiming_startTime = now();
}

static void stopTiming() {
  long end = now();
  print("Time: " + (end-startTiming_startTime) + " ms");
}

static void print() {
  System.out.println();
}

static void print(Object o) {
  System.out.println(o);
}

static void print(long i) {
  System.out.println(i);
}

  static Object call(Object o, String method, Object... args) {
    try {
      if (o instanceof Class) {
        Method m = call_findStaticMethod((Class) o, method, args, false);
        m.setAccessible(true);
        return m.invoke(null, args);
      } else {
        Method m = call_findMethod(o, method, args, false);
        m.setAccessible(true);
        return m.invoke(o, args);
      }
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  static Method call_findStaticMethod(Class c, String method, Object[] args, boolean debug) {
    Class _c = c;
    while (c != null) {
      for (Method m : c.getDeclaredMethods()) {
        if (debug)
          System.out.println("Checking method " + m.getName() + " with " + m.getParameterTypes().length + " parameters");;
        if (!m.getName().equals(method)) {
          if (debug) System.out.println("Method name mismatch: " + method);
          continue;
        }

        if ((m.getModifiers() & Modifier.STATIC) == 0 || !call_checkArgs(m, args, debug))
          continue;

        return m;
      }
      c = c.getSuperclass();
    }
    throw new RuntimeException("Method '" + method + "' (static) with " + args.length + " parameter(s) not found in " + _c.getName());
  }

  static Method call_findMethod(Object o, String method, Object[] args, boolean debug) {
    Class c = o.getClass();
    while (c != null) {
      for (Method m : c.getDeclaredMethods()) {
        if (debug)
          System.out.println("Checking method " + m.getName() + " with " + m.getParameterTypes().length + " parameters");;
        if (m.getName().equals(method) && call_checkArgs(m, args, debug))
          return m;
      }
      c = c.getSuperclass();
    }
    throw new RuntimeException("Method '" + method + "' (non-static) with " + args.length + " parameter(s) not found in " + o.getClass().getName());
  }

  private static boolean call_checkArgs(Method m, Object[] args, boolean debug) {
    Class<?>[] types = m.getParameterTypes();
    if (types.length != args.length) {
      if (debug)
        System.out.println("Bad parameter length: " + args.length + " vs " + types.length);
      return false;
    }
    for (int i = 0; i < types.length; i++)
      if (!(args[i] == null || types[i].isInstance(args[i]))) {
        if (debug)
          System.out.println("Bad parameter " + i + ": " + args[i] + " vs " + types[i]);
        return false;
      }
    return true;
  }



static String structure(Object o) {
  return structure(o, 0);
}
  
static String structure(Object o, int stringSizeLimit) {
  if (o == null) return "null";
  String name = o.getClass().getName();
  
  StringBuilder buf = new StringBuilder();
  
  if (o instanceof Collection) {
    for (Object x : (Collection) o) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(x, stringSizeLimit));
    }
    return "{" + buf + "}";
  }
  
  if (o instanceof Map) {
    for (Object e : ((Map) o).entrySet()) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(((Map.Entry) e).getKey(), stringSizeLimit));
      buf.append("=");
      buf.append(structure(((Map.Entry) e).getValue(), stringSizeLimit));
    }
    return "{" + buf + "}";
  }
  
  if (o.getClass().isArray()) {
    int n = Array.getLength(o);
    for (int i = 0; i < n; i++) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(structure(Array.get(o, i), stringSizeLimit));
    }
    return "{" + buf + "}";
  }

  if (o instanceof String)
    return quote(stringSizeLimit != 0 ? shorten((String) o, stringSizeLimit) : (String) o);
  
  // Need more cases? This should cover all library classes...
  if (name.startsWith("java.") || name.startsWith("javax."))
    return String.valueOf(o);
    
  String shortName = o.getClass().getName().replaceAll("^main\\$", "");

  // TODO: go to superclasses too
  Field[] fields = o.getClass().getDeclaredFields();
  int numFields = 0;
  String fieldName = "";
  for (Field field : fields) {
    if ((field.getModifiers() & Modifier.STATIC) != 0)
      continue;
    Object value;
    try {
      value = field.get(o);
    } catch (Exception e) {
      value = "?";
    }
    
    fieldName = field.getName();
    
    // put special cases here...

    if (value != null) {
      if (buf.length() != 0) buf.append(", ");
      buf.append(fieldName + "=" + structure(value, stringSizeLimit));
    }
    ++numFields;
  }
  String b = buf.toString();
  if (numFields == 1)
    b = b.replaceAll("^" + fieldName + "=", ""); // drop field name if only one
  String s = shortName;
  if (buf.length() != 0)
    s += "(" + b + ")";
  return s;
}

static long now() {
  return System.currentTimeMillis();
}


  public static String quote(String s) {
    if (s == null) return "null";
    return "\"" + s.replace("\\", "\\\\").replace("\"", "\\\"").replace("\r", "\\r").replace("\n", "\\n") + "\"";
  }

static String shorten(String s, int max) {
  return s.length() <= max ? s : s.substring(0, Math.min(s.length(), max)) + "...";
}
}