Keylogger

Capture global keyboard events on Linux

Notes

• Only Linux based
• Need root privilages

Installation

go get github.com/MarinX/keylogger

Getting started

Finding keyboard device

There is a helper on finding the keyboard.

 keyboard := keylogger.FindKeyboardDevice()

Which goes through each file device name to find keyword "keyboard"

/sys/class/input/event[0-255]/device/name

and returns the file event path if found

/dev/input/event2

If the function returns empty string, you will need to cat each device name and get the event number. If you know already, you can easily pass it to constructor

keylogger.New("/dev/input/event2")

Getting keypress

Once the keylogger returns channel event, you can switch by event code as described in input_event.go For start, you can listen on keyboard state change

keylogger.EvKey

Once you get desire event, there is a helper to parse code into human readable key.

event.KeyString()

Writing keypress

Best way is to open an text editor and see how keyboard will react There are 2 methods:

func (k *KeyLogger) WriteOnce(key string) error

and

func (k *KeyLogger) Write(direction KeyEvent, key string) error 

WriteOnce method simulates single key press, eg: press and release letter M

Write writes to keyboard and sync the event. This will keep the key pressed or released until you call another write with other direction eg, if the key is "A" and direction is press, on UI, you will see "AAAAA..." until you stop with release

Probably you want to use WriteOnce method

NOTE

If you listen on keyboard state change, it will return double results. This is because pressing and releasing the key are 2 different state change. There is a helper function which you can call to see which type of state change happend

// returns true if key on keyboard is pressed
event.KeyPress()

// returns true if key on keyboard is released
event.KeyRelease()

Example

You can find a example script in example/main.go

Running tests

No magic, just run

go test -v

Creating key sniffer (needs update)

• sniffing global keyboard events in go

License

This library is under the MIT License