检测UDP端口是否开放，检测UDP端口开放,[Python]代码im

检测UDP端口是否开放，检测UDP端口开放,[Python]代码im

[Python]代码

import socketimport threadingimport timeimport structimport Queuequeue = Queue.Queue()def udp_sender(ip,port):    try:        ADDR = (ip,port)        sock_udp = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)        sock_udp.sendto("abcd...",ADDR)        sock_udp.close()    except:        passdef icmp_receiver(ip,port):    icmp = socket.getprotobyname("icmp")    try:        sock_icmp = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)    except socket.error, (errno, msg):        if errno == 1:            # Operation not permitted            msg = msg + (                " - Note that ICMP messages can only be sent from processes"                " running as root."            )            raise socket.error(msg)        raise # raise the original error    sock_icmp.settimeout(3)    try:        recPacket,addr = sock_icmp.recvfrom(64)    except:        queue.put(True)        return    icmpHeader = recPacket[20:28]    icmpPort = int(recPacket.encode('hex')[100:104],16)    head_type, code, checksum, packetID, sequence = struct.unpack(            "bbHHh", icmpHeader    )    sock_icmp.close()    if code == 3 and icmpPort == port and addr[0] == ip:        queue.put(False)    returndef checker_udp(ip,port):    thread_udp = threading.Thread(target=udp_sender,args=(ip,port))    thread_icmp = threading.Thread(target=icmp_receiver,args=(ip,port))    thread_udp.daemon= True    thread_icmp.daemon = True    thread_icmp.start()    time.sleep(0.1)    thread_udp.start()    thread_icmp.join()    thread_udp.join()    return queue.get(False)if __name__ == '__main__':    import sys    print checker_udp(sys.argv[1],int(sys.argv[2]))