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bind callback is not work #58

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patronplatform opened this issue Jul 8, 2020 · 1 comment

patronplatform commented Jul 8, 2020

hi guys i want to make a packet queue with this simple code :


from netfilterqueue import NetfilterQueue

def print_and_accept(pkt):
    print(pkt)


nfqueue = NetfilterQueue()
nfqueue.bind(0, print_and_accept)

but
"print_and_accept" is not fire and work !
program doesnt print packet and internet is worked well !
how ?
and how can fix it

slrendell commented Aug 8, 2020 •

edited

You need to accept the packet after you print it and you need to call run on nfqueue.

from netfilterqueue import NetfilterQueue

def print_and_accept(pkt):
    print(pkt)
    pkt.accept()


nfqueue = NetfilterQueue()
nfqueue.bind(0, print_and_accept)
nfqueue.run()

You also need to insert a rule in to iptables to queue the packets.

sudo iptables -I INPUT 1 -j NFQUEUE --queue-num 0

Remove the rule after with

sudo iptables -D INPUT 1

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