Build your own tools

You can use Scapy to make your own automated tools. You can also extend Scapy without having to edit its source file.

If you have built some interesting tools, please contribute back to the github wiki !

Using Scapy in your tools

You can easily use Scapy in your own tools. Just import what you need and do it.

This first example takes an IP or a name as first parameter, send an ICMP echo request packet and display the completely dissected return packet:

#! /usr/bin/env python

import sys
from scapy.all import sr1,IP,ICMP

if p:

Configuring Scapy’s logger

Scapy configures a logger automatically using Python’s logging module. This logger is custom to support things like colors and frequency filters. By default, it is set to WARNING (when not in interactive mode), but you can change that using for instance:

import logging

To disable almost all logs. (Scapy simply won’t work properly if a CRITICAL failure occurs)


On interactive mode, the default log level is INFO

More examples

This is a more complex example which does an ARP ping and reports what it found with LaTeX formatting:

#! /usr/bin/env python
# arping2tex : arpings a network and outputs a LaTeX table as a result

import sys
if len(sys.argv) != 2:
    print("Usage: arping2tex <net>\n  eg: arping2tex")

from scapy.all import srp, Ether, ARP, conf
conf.verb = 0
ans, unans = srp(Ether(dst="ff:ff:ff:ff:ff:ff") / ARP(pdst=sys.argv[1]),

print(r"MAC & IP\\")
for snd,rcv in ans:
    print(rcv.sprintf(r"%Ether.src% & %ARP.psrc%\\"))

Here is another tool that will constantly monitor all interfaces on a machine and print all ARP request it sees, even on 802.11 frames from a Wi-Fi card in monitor mode. Note the store=0 parameter to sniff() to avoid storing all packets in memory for nothing:

#! /usr/bin/env python
from scapy.all import *

def arp_monitor_callback(pkt):
    if ARP in pkt and pkt[ARP].op in (1,2): #who-has or is-at
        return pkt.sprintf("%ARP.hwsrc% %ARP.psrc%")

sniff(prn=arp_monitor_callback, filter="arp", store=0)

For a real life example, you can check Wifitap. Sadly, Wifitap is no longer maintained but nonetheless demonstrates Scapy’s Wi-Fi capabilities. The code can be retrieved from github.

Extending Scapy with add-ons

If you need to add some new protocols, new functions, anything, you can write it directly into Scapy’s source file. But this is not very convenient. Even if those modifications are to be integrated into Scapy, it can be more convenient to write them in a separate file.

Once you’ve done that, you can launch Scapy and import your file, but this is still not very convenient. Another way to do that is to make your file executable and have it call the Scapy function named interact():

#! /usr/bin/env python

# Set log level to benefit from Scapy warnings
import logging
logger = logging.getLogger("scapy")

from scapy.all import *

class Test(Packet):
    name = "Test packet"
    fields_desc = [ ShortField("test1", 1),
                    ShortField("test2", 2) ]

def make_test(x,y):
    return Ether()/IP()/Test(test1=x,test2=y)

if __name__ == "__main__":
    interact(mydict=globals(), mybanner="Test add-on v3.14")

If you put the above listing in the file and make it executable, you’ll get:

# ./
Welcome to Scapy (
Test add-on v3.14
>>> make_test(42,666)
<Ether type=0x800 |<IP |<Test test1=42 test2=666 |>>>