Scapy

Scapy:

Scapy is a powerful Python library used for network packet manipulation and analysis. It allows you to create, send, capture, and dissect network packets, making it a versatile tool for network protocol development, network troubleshooting, and security testing.

With Scapy, you can craft custom network packets at the packet level, specifying fields such as source and destination IP addresses, port numbers, protocol types, and payload data. It supports a wide range of protocols including TCP, UDP, ICMP, DNS, HTTP, and many more. Scapy also provides functions to send these custom packets over the network and capture responses or any other packets that match specific criteria.

Here’s a simple example that demonstrates how to send an ICMP ping packet using Scapy:

In the above example, we create an IP packet with a destination IP address set to “example.com” and an ICMP layer. The sr1() function sends the packet and waits for a response, with a timeout of 2 seconds. If a response is received, we print the details of the response packet using response.show(). Otherwise, we print a message indicating that no response was received.

Scapy offers many more advanced features such as sniffing packets from the network interface, replaying captured packets, performing network scans, forging arbitrary packets, and analyzing packet headers and payloads. It’s a versatile tool for network programming and analysis tasks.