Router Redirector

This tool was made sometime between 2011 and 2015, as a troubleshooting aid. It's main goal was to redirect a user to the configuration web interface of a consumer grade router.

It does not, and cannot work with modern browsers.

Theory of operation

1. A WebRTC leak is used to determine the private IP address of the user
2. The tool checks if the address is likley a private IP range in a consumer device. (in 192.168/16)
3. The tool dispatches a worker-based HTTP request to 192.168.X.1. This request will fail, either because there is nothing listening, or because of CORS.
4. The timing of the prior step is evaluated to determine if the request failed fast (due to CORS) or slow (due to timeout)
5. If the request was "fast", the user is redirected to the determined address.
6. If the request was "slow", repeat the request and timing check for 192.168.X.254
7. If this second request was "fast", redirect there, if "slow", display a failure message

FAQ

• Q: Why won't this work now?
  A: WebRTC no longer leaks the user's internal IP in a simple way
• Q: The JS doesn't appear to work at all, WTF?
  A: This is an old WIP copy posted here for posterity
• Q: Why is the HTML/JS such a mess
  A: This code is old enough to drink in some european countires. I had barely any idea what I was doing