#!/usr/bin/env python

import sys
from scapy.all import *

def synscan(host):
   ports = range(1000)
   ip = IP(dst=host)   
   tcp = TCP(dport=ports,flags="S")      
   ans,unans = sr(ip/tcp)         
   for sent,rcvd in ans:            
      if rcvd.haslayer(TCP):               
         # if rcvd.getlayer(TCP).flags & 2:   
         if rcvd.sprintf("%TCP.flags%") == 'SA':      
            print sent.dport                              
                                          
synscan("192.168.0.1")