stop_filter | mowblog

由于stop_filter是作用在每一个packet的，当终止函数返回True的时候，只有在收到包的时候sniff才会返回，所以如果捕获的是明文数据，可以直接通过过滤Raw load方式处理，但是如果都是密文，通过kill方式来结束sniff也是一个可取的办法

from scapy.all import sniff, Raw, wrpcap

import threading

import time

import signal

e = threading.Event()

def handler(signum, frame):

global e

e.set()

def sniff_with_signal():

global e

pcap = sniff(iface=['wlxe84e063348c8', 'lo'], stop_filter=lambda p: e.is_set())

#pcap = sniff(iface=['wlxe84e063348c8', 'lo'],

# stop_filter=lambda p: p.haslayer(Raw) and 'stopflag' in p.getlayer(Raw).load)

wrpcap('/tmp/test.pcap', pcap)

print('pcap has wrote into file /tmp/test.pcap')

def main():

signal.signal(signal.SIGTERM, handler)

thread = threading.Thread(target=sniff_with_signal)

thread.start()

while True:

thread.join(2)

if thread.is_alive():

print('thread is alive')

else:

break

if __name__ == '__main__':

main()

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