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如何用python方法检测UDP端口

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如何用python方法检测UDP端口,首先要了解什么是UDP端口及作用。网上搜索了一圈后,我得到的个人理解是:UDP端口是含有网络服务必须的源端口和目的端口信息,用以建立和实现网络传输服务。

那么如何用python方法检测UDP端口呢?看看下边这段网友提供的代码吧。

socketthreadingtimeQueue这些是要用到的python方法模块。

import socket
import threading
import time
import struct
import Queue

queue = 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:
        pass


def 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)
    return

#www.iplaypython.com

def 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]))

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文章发布日期:2016-07-20 15:25 玩蛇网 www.iplaypython.com

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