gistfile1.txt

#!/usr/bin/env ruby

### CHANGE THIS TO YOUR SERVER OK?
TUNNEL_ENDPOINT = 'username@example.com'

### YOU CAN ALSO USE 'Ethernet' et al.
INTERFACE = 'AirPort'

PORT = 3022

def switch_on
  start_tunnel && proxy_traffic
end

def switch_off
  stop_tunnel && stop_proxying
end

def ssh_command
  "ssh -D #{PORT} -f -C -q -N #{TUNNEL_ENDPOINT}"
end

def ssh_process_id
  ssh_processes = `ps -o pid,command -h -e | grep '#{ssh_command}' | grep -v grep`
  return nil if ssh_processes == ""
  return ssh_processes.split(' ').first
end

def start_tunnel
  system ssh_command if ssh_process_id.nil?
end

def stop_tunnel
  process = ssh_process_id
  system "kill #{process}" unless process.nil?
end

def proxy_traffic
  system "sudo networksetup -setsocksfirewallproxy #{INTERFACE} 127.0.0.1 #{PORT} off"
end

def stop_proxying
  system "sudo networksetup -setsocksfirewallproxystate #{INTERFACE} off"
end

action = ARGV[0] || 'usage'

case (action) 
  when 'on'
    switch_on
  when 'off'
    switch_off
  else
    puts "#{$0} (on|off)"
end