netmon_cli

A simple, lightweight, terminal packet sniffer written in C.

DISCLAIMER

This tool was built for EDUCATIONAL PURPOSES only, I am not responsible for any damaged caused by illcit use of this script.

About

As the header says, this is a dead simple packet sniffer written in C using ONLY built in libs. The sniffer relies on raw sockets to capture incoming and outgoing packets from your Linux machine.

It has a REPL interface written from scratch and it can dump sniffed packets to a txt file. Maybe, it will eventually support pcap files in the future.

I have developed this tool while studying the C language and Unix related programming so this is not an advanced tool, it's more of a PoC for me but I have decided to share it anyway.

It's called netmon because it can be developed into a fully featured network monitoring tool, but for now it's only a packet sniffer.

Requirements

• Linux machine
• gcc compiler
• root permissions
• make

Note

I have used special characters to display colors, they may not work in some terminal emulators.

Features

• showip [DOMAIN NAME] --> shows the corresponding IPv4 and IPv6 address of a given domain name
• sniff -p [NUMBER OF PACKETS] -f [TO FILE OR TO STDOUT] --> sniff a given number of packets to a file or to the screen (0 for stdout, 1 for log file)

Run

make netmon

sudo ./netmon --> MUST BE ROOT TO USE RAW SOCKETS

To clean everything INCLUDING THE LOG FILE:

make clean

Note

The if statement to remove log.txt in Makefile strangely works on Manjaro but not in Xubuntu.

Contributing

Feel free to add features, make PRs and fix typos in my code! I am still a beginner in C so this piece of software won't be perfect, any help is appreciated!