Simple Linux Keylogger (for learning purposes)

This is a simple keylogger I wrote to practise with C and understand how Linux device input work. It finds the keyboard device under /dev/input, reads key events using input_event struct, and prints key names.

It does require root (sudo) to access the input devices.

Requirements

• Linux (tested on Arch VM)
• GCC
• Root permissions (sudo)

Build

make

Run

sudo ./keylogger

Notes

• I use input_event sturct to parse raw keyboard events;
• Keys are mapped with a custom KEY_CODES table that I found on the internet.
• This program is not stealthy or optimized.
• The program is educational. Be ethical.