让DNS查询经由python代码之手

dns_hijacking_obversation.py

from netfilterqueue import NetfilterQueue
import subprocess
import signal
def observe_dns_hijacking(nfqueue_element):
    print('packet past through me')
    nfqueue_element.accept()
nfqueue = NetfilterQueue()
nfqueue.bind(0, observe_dns_hijacking)
def clean_up(*args):
    subprocess.call('iptables -D OUTPUT -p udp --dst 8.8.8.8 -j QUEUE', shell=True)
    subprocess.call('iptables -D INPUT -p udp --src 8.8.8.8 -j QUEUE', shell=True)
signal.signal(signal.SIGINT, clean_up)
try:
    subprocess.call('iptables -I INPUT -p udp --src 8.8.8.8 -j QUEUE', shell=True)
    subprocess.call('iptables -I OUTPUT -p udp --dst 8.8.8.8 -j QUEUE', shell=True)
    print('running..')
    nfqueue.run()
except KeyboardInterrupt:
    print('bye')