./simple_pf.rb {FORWARD-TO-HOSTNAME}

simple_pf.rb

#!/usr/bin/ruby
exit 1 if ARGV.empty?

require 'rubygems'
require 'net/ssh'
require 'yaml'

Login = YAML.load_file("./login.yml")

def start_forwarding
  Net::SSH.start('localhost', Login[:user], :password => Login[:pass]) do |ssh|
    puts "Start forwarding localhost:8080 to #{ARGV[0]}"
    forwarding = true
    ssh.forward.local("192.168.0.1", 8080, ARGV[0], 80)
    Signal.trap(:INT) do
      forwarding = false
    end
    ssh.loop(0.1) do
      if forwarding
        true
      else
        ssh.forward.cancel_local(8080, "192.168.0.1")
        puts "Canceled"
        false
      end
    end
  end
end

start_forwarding