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 shells (I use bash)

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

or you can do it manually:

gcc netmon.c -o netmon

sudo ./netmon

To clean everything INCLUDING THE LOG FILE:

make clean

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!