为什么我的Ubuntu在启动python脚本后冻结?

时间:2019-01-06 19:53:25

标签: python multithreading scapy

我写了一个简单的脚本,用于计算网络带宽。我使用库Scapy嗅探所有传入流量并计算速度。这是我的代码,嗅探流量:

from time import sleep
from threading import Thread, Event
from scapy.all import *

class Sniffer(Thread):
    def __init__(self):
        Thread.__init__(self)
        self.count_downloaded_bytes = 0

    def run(self):
        sniff(filter="ip", prn=self.get_packet)

    def get_packet(self, packet):
        self.count_downloaded_bytes += len(packet) # calculate size of packets

    def get_count_downloaded_bytes(self):
        count_d_bytes = self.count_downloaded_bytes
        self.count_downloaded_bytes = 0
        return count_d_bytes # returns size of downloaded data in bytes

此代码每10秒以Mb / s为单位计算带宽

class NetworkSpeed(Thread):
    def  __init__(self):
        Thread.__init__(self)
        self.sniffer = Sniffer() # create seconds thread, that sniffs traffic
        self.start()

    def calculate_bandwidth(self, count_downloaded_bytes, duration):
        download_speed = (count_downloaded_bytes / 1000000 * 8) / duration
        print('download_speed = ', download_speed)

    def run(self):
        counter = 0
        self.sniffer.start()
        while True:
            if counter == 10:
            self.calculate_bandwidth(self.sniffer.get_count_downloaded_bytes(), 10)
            counter = 0

        counter += 1
        sleep(1)

network_speed = NetworkSpeed()

我知道,代码不是很好,它只是一个原型。但是我还有另一个问题:我以root特权启动了此脚本,并且在计算机挂起5分钟后,它开始非常缓慢地工作。该脚本似乎占用了所有RAM。我怎样才能解决这个问题 ?因为脚本应该至少工作1天。

1 个答案:

答案 0 :(得分:1)

我认为问题可能出在sniff函数中,请尝试使用

进行调用
def run(self):
    sniff(filter="ip", prn=self.get_packet,store=False)

这样它就不会保存数据包并填充内存。