Network Scanning using scapy module - Python

Network Scanning using scapy module - Python

The scapy module is a powerful tool in Python for packet manipulation and network scanning. Using scapy, you can craft, send, and capture network packets, making it a useful tool for network analysis, testing, and security assessments.

Here's a basic example of how you can use scapy to perform a simple ICMP ping (echo request) scan on a subnet to see which hosts are up:

  1. Installation:

    First, you need to install scapy:

    pip install scapy

  2. ICMP Ping Scan:

    from scapy.all import ICMP, IP, sr1, srp, conf import time # To avoid verbosity in scapy output conf.verb = 0 # Target subnet subnet = "192.168.1.0/24" # Create the packet packet = IP(dst=subnet) / ICMP() # Send the packet and capture the response alive, _ = srp(packet, timeout=2, retry=1) # Print live hosts print("Live hosts:") for _, rcv in alive: print(rcv.src)

  3. ARP Scan:

    An ARP scan can also be performed using scapy to determine which hosts are active within a local network:

    from scapy.all import ARP, Ether, srp, conf conf.verb = 0 # Target subnet subnet = "192.168.1.0/24" # Create ARP request packet to get the MAC address arp = ARP(pdst=subnet) ether = Ether(dst="ff:ff:ff:ff:ff:ff") packet = ether/arp # Send the packet and capture the response result, _ = srp(packet, timeout=2, retry=1) # Print live hosts print("Live hosts:") for sent, received in result: print(received.psrc)

These scripts send packets to each IP address in the specified subnet and then display the IP addresses that responded, indicating that they are up.

Important: Be sure you have the appropriate permissions to scan the network you're targeting. Unauthorized scanning can be illegal and disruptive. Always obtain explicit permission before conducting any network scanning activities.

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