link-local.rb

link-local.rb

require 'sinatra'

set :bind, '0.0.0.0'

get '/link-local/:mac' do
	mac = params['mac']
	x = mac.split(':')
	x.insert(3, 'ff')
	x.insert(4, 'fe')
	x[0] = (x[0].to_i(16) ^ 0b00000010).to_s(16)
	x.insert(0, 'fe')
	x.insert(1, '80')
	x = x.each_slice(2).map{|x|x.join('')}.join(':')
	x.insert(4, ":")
	x
end