from scapy.all import *

import optparse

import threading

def scan(target,port):

    pkt=IP(dst=target)/UDP(dport=int(port))

    res=sr1(pkt,timeout=0.1,verbose=0)

    if res==None:

        print(port,' is online')

def main():

    parser=optparse.OptionParser("%prog"+"-t <target> -p <port>")

    parser.add_option('-t',dest='target',type='string',help='Target')

    parser.add_option('-p',dest='port',type='string',help='Port(split with \',\')')

    (options,args)=parser.parse_args()

    target=options.target

    ports=str(options.port).split(',')

    if(target==None) or (ports[0]==None):

        print('Please input target(-t) and port(-p)!')

        exit(0)

    for port in ports:

        t=threading.Thread(target=scan,args=(target,port))

        t.start()

if __name__=='__main__':

    main()