Is there a way to capture packets in background and send packets using scapy?

Question

I am trying to capture incoming packets while sending continues packets in an interface (interval - 1 pps) using scapy. I tried sniff function with different parameters associated with it (ex. prn). But it didn't worked, since sniff not completes the action (sniffinf) to proceed send packets or not capturing packets in background.

My Requirements:

Start capture using scapy
Send traffic/packets
stop capture using scapy

Tried:

sniff(iface="eno2") <-- This listen for packets to capture (Actually Peer will send packets once it receives packets from this interface(control packets exchanges) sendp(pkt, iface="eno2") <--- This command not get executed since sniff execution not complete

Thanks.

You could supply the `prn` argument to react to packets as the come in: `def callback(pkt): pkt.show(); sniff(iface="eno2", prn=callback, store=False)` — Carcigenicate, Jun 08 '21 at 16:28

score 0 · Answer 1 · answered Jun 08 '21 at 18:56

0

Use AsyncSniffer

from scapy.sendrecv import AsyncSniffer, send
a = AsyncSniffer()
a.start()
send(IP(dst="www.google.com")/ICMP(), inter=1, count=30)
results = a.stop()

I used count to have some sort of way of stopping sendp

answered Jun 08 '21 at 18:56

Cukic0d

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Thanks @Cukic0d, It helped for my requirement to send and sniff. – Premkumar S Jul 08 '21 at 05:47

score 0 · Accepted Answer · answered Jun 20 '21 at 11:08

0

You can try AsyncSniffer like Cukic0d stated or you can just create a Python thread which targets your sniffing function.

import threading
thread = threading.Thread(target=sniff_def, args=(arg1, arg2,))
thread.start()

answered Jun 20 '21 at 11:08

Lloen

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Yes but you can't stop it programmatically, whereas you can stop `AsyncSniffer` – Cukic0d Jun 20 '21 at 22:45

Is there a way to capture packets in background and send packets using scapy?

2 Answers2