Renews your DHCP Lease every 30-seconds, until an IP Address is assigned. Fight crappy WAPs!

renew_dhcp_until_ip.rb

#!/usr/bin/env ruby

# I believe 'en1' is the default WiFi device name on Mac OS X. It's what mine is set to.
def device; @device ||= ARGV[0] || "en1" end

def ip_set?
  ip = `ipconfig getifaddr #{device}`

  return false if ip.empty?
  return false if ip.start_with?("169")
  return true
end

def renew_dhcp_until_ip
  until ip_set?
    # Reset the IP
    `sudo ipconfig set #{device} BOOTP`
    `sudo ipconfig set #{device} DHCP`
    sleep 30
  end

  `say 'Hey! You! You have an IP now! Z O M and G!'`
end

renew_dhcp_until_ip