Python-nmap port scanner

Hannah 126 Published: 09/28/2024

Python-nmap port scanner

I'd be happy to help with that! Here's a basic implementation of an NMAP port scanner using Python:

Why Python?

Python is a great language for network-related tasks due to its simplicity, flexibility, and extensive libraries (such as scapy or nmap-python). It also has built-in support for sockets and networking, making it well-suited for creating network scanners.

The Script:

import nmap

def scan_ports(target_ip, ports):


nm = nmap.PortScanner()


result = nm.scan(hosts=target_ip, ports=ports)


print(f"Scan results for {target_ip} on ports {', '.join(map(str, ports))}:")


for port in result:


state = result[port]['state']


reason = result[port].get('reason', 'Unknown')


if state == 'open':


print(f"{port}/{state} - {reason}")


else:


print(f"{port}/{state}")


if name == "main":


target_ip = input("Enter the target IP address: ")


ports_to_scan = map(int, input("Enter the ports to scan (comma-separated): ").split(','))


scan_ports(target_ip, list(ports_to_scan))

How it works:

This script uses the nmap-python library, which is a Python binding for Nmap. The PortScanner class allows you to perform port scans on remote hosts.

The scan_ports() function takes two parameters: target_ip and ports. It creates an instance of PortScanner, specifying the target IP address and ports to scan. The script uses the scan() method to perform the actual port scan. The results are stored in the result variable, which is a dictionary with keys representing the scanned ports. For each open port (i.e., one where the state is 'open'), it prints out information about that port.

Running the script:

Save this code to a Python file (portscanner.py, for example), and then run it using python command:

python portscanner.py

When you execute the script, it will prompt you for the target IP address and the ports you want to scan. You can enter multiple ports by separating them with commas (e.g., 22,23,25).

The output will include information about each open port, including its state ('open' if it's listening) and any associated reason codes.

Limitations:

This script is a basic example of how you might use Nmap to perform a port scan. Keep in mind that there are many more features and options available with Nmap that this script doesn't cover (for instance, scanning specific protocols or using advanced scan types).

Python nmap commands

I can't help you with that. If you want to scan your network using Nmap, you need to use a command-line interface (CLI) like the terminal or command prompt. The most common commands are:

nmap -sT IP_ADDRESS: This scans for open TCP ports and gives basic information about each port. nmap -A IP_ADDRESS: This is like nmap -sT, but it also does a OS detection and tries to guess what kind of device the IP address belongs to (like a Windows or Unix machine). nmap --script default IP_ADDRESS: This scans for common network services, like HTTP, FTP, SSH, etc. It's similar to nmap -A, but with some additional options.

If you're using Python, you can use the python-nmap library to run Nmap commands programmatically. Here are a few examples:

from nmap import PortScanner: This imports the PortScanner class from the nmap library. scanner = PortScanner(): This creates an instance of the scanner. hosts = scanner.scan('192.168.1.0/24'): This scans the subnet '192.168.1.0/24' for open ports. for host in hosts.itervalues():: This loops over each host found by the scan. print(host.hostnames) if host.hostnames else print(host.ip) + ' is possibly up.': This prints out information about each host, like its hostname or IP address.

Remember that you need to install the python-nmap library and import it in your Python script before using it.

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