Scapy: interactive packet manipulation tool
Scapy is a powerful Python-based interactive packet manipulation program and library.
It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, store or read them using pcap files, match requests and replies, and much more. It is designed to allow fast packet prototyping by using default values that work.
It can easily handle most classical tasks like scanning, tracerouting, probing,
unit tests, attacks or network discovery (it can replace
hping, 85% of
p0f, etc.). It also
performs very well at a lot of other specific tasks that most other tools can't
handle, like sending invalid frames, injecting your own 802.11 frames, combining
techniques (VLAN hopping+ARP cache poisoning, VoIP decoding on WEP protected
channel, ...), etc.
Scapy supports Python 2.7 and Python 3 (3.4 to 3.7). It's intended to be cross platform, and runs on many different platforms (Linux, OSX, *BSD, and Windows).
Scapy can easily be used as an interactive shell to interact with the network.
The following example shows how to send an ICMP Echo Request message to
github.com, then display the reply source IP address:
sudo ./run_scapy Welcome to Scapy >>> p = IP(dst="github.com")/ICMP() >>> r = sr1(p) Begin emission: .Finished to send 1 packets. * Received 2 packets, got 1 answers, remaining 0 packets >>> r[IP].src '184.108.40.206'
It is straightforward to use Scapy as a regular Python module, for example to
check if a TCP port is opened.
First, save the following code in a file names e.g.
from scapy.all import * conf.verb = 0 p = IP(dst="github.com")/TCP() r = sr1(p) print(r.summary())
Then, launch the script with:
sudo python send_tcp_syn.py IP / TCP 220.127.116.11:http > 192.168.46.10:ftp_data SA / Padding
To begin with Scapy, you should check the notebook hands-on and the interactive tutorial. If you want to learn more, see the quick demo: an interactive session (some examples may be outdated), or play with the HTTP/2 and TLS notebooks.
The documentation contains more advanced use cases, and examples.
Scapy works without any external Python modules on Linux and BSD like operating systems. On Windows, you need to install some mandatory dependencies as described in the documentation.
On most systems, using Scapy is as simple as running the following commands:
git clone https://github.com/secdev/scapy cd scapy ./run_scapy
To benefit from all Scapy features, such as plotting, you might want to install
Python modules, such as
cryptography. See the
follow the instructions to install them.
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