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SIMULATING USB KEYBOARD INPUT ON ANOTHER MACHINE

Abstract: Learn how to simulate USB keyboard input on another machine using
appropriate tools and techniques.

2024-01-14 by DevCodeF1 Editors



SIMULATING USB KEYBOARD INPUT TO ANOTHER MACHINE

Have you ever wondered if it's possible to make one computer function as a USB
keyboard for another machine? In this article, we will explore the concept of
simulating USB keyboard input to another machine, without requiring any specific
software installation on the recipient machine.


UNDERSTANDING USB KEYBOARD EMULATION

USB keyboard emulation is the process of making a device or software appear as a
USB keyboard to a computer. This can be useful in various scenarios, such as
automating tasks, testing keyboard input in different environments, or
controlling a computer without an actual keyboard.


TOOLS AND LIBRARIES FOR USB KEYBOARD EMULATION

There are several tools and libraries available for USB keyboard emulation, both
for Windows and Linux platforms. Some popular options include:

 * USBIP: A Linux kernel module and userspace tools that allow USB devices to be
   used remotely over a network.

 * VirtualHere: A cross-platform solution that enables sharing of USB devices
   over a network.

 * PyUSB: A Python library for working with USB devices, which can be used to
   simulate keyboard input.

 * libusb: A C library for USB access, which can be used to create custom USB
   keyboard emulation applications.


SIMULATING USB KEYBOARD INPUT WITH PYTHON AND PYUSB

In this example, we will demonstrate how to simulate USB keyboard input using
Python and the PyUSB library. First, install the PyUSB library:

pip install pyusb

Next, create a Python script to send USB keyboard input:

import usb.core
import usb.util

# Find the USB keyboard device
keyboard_vendor_id = 0x04d9
keyboard_product_id = 0x1600
keyboard = usb.core.find(idVendor=keyboard_vendor_id, idProduct=keyboard_product_id)

# Set the USB keyboard as configured
usb.util.claim_interface(keyboard, 0)

# Define the keyboard input report
keyboard_input_report = [
    0x01,  # Modifier keys (left control, left shift, left alt, left GUI)
    0x00,  # Reserved
    0x00,  # Reserved
    0x00,  # LEDs (num lock, caps lock, scroll lock)
    0x00,  # LEDs (compose, Kana, Scroll Lock)
    0x00,  # Reserved
    0x1c,  # Keycode for 'a'
    0x00,  # Reserved
]

# Send the USB keyboard input report
keyboard.ctrl_transfer(
    bmRequestType=0x21,
    bRequest=0x09,
    wValue=0x100,
    wIndex=0x00,
    data_or_wLength=keyboard_input_report,
    timeout=5000,
)

# Release the USB keyboard
usb.util.dispose_resources(keyboard)



This script will send a USB keyboard input report for the 'a' key. You can
modify the keyboard_input_report list to send different keys or combinations of
keys.

Simulating USB keyboard input to another machine is possible using various tools
and libraries, such as USBIP, VirtualHere, PyUSB, and libusb. This technique can
be useful in automating tasks, testing keyboard input, or controlling a computer
without an actual keyboard. In this article, we demonstrated how to simulate USB
keyboard input using Python and the PyUSB library.


REFERENCES

 * USB/IP Userspace Project

 * VirtualHere

 * PyUSB on GitHub

 * libusb

Tags::  Backend Devops




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