wifi.rb

#!/usr/bin/env ruby
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __FILE__)
require 'bundler/setup'
require 'dbus'

class Wicd
  NOT_CONNECTED = 0
  CONNECTING = 1
  WIRELESS = 2
  WIRED = 3
  SUSPENDED = 4

  def initialize(bus)
    @bus = bus
    service = bus.service 'org.wicd.daemon'
    wireless = service.object '/org/wicd/daemon/wireless'
    wireless.introspect
    @wireless = wireless['org.wicd.daemon.wireless']
    wicd = service.object '/org/wicd/daemon'
    wicd.introspect
    @wicd = wicd['org.wicd.daemon']

    @wicd.on_signal 'StatusChanged', &method(:on_status_changed)
    @wireless.on_signal 'SendEndScanSignal', &method(:on_send_end_scan_signal)

    @essid_priority = %w[
      moxanet2
      moxanet
      moxanet1
      lambda-net2
      titech-pubnet
    ]

    ret = @wicd.GetConnectionStatus.first
    @last_state = ret[0]
    on_status_changed *ret
  end

  def scan!
    @wireless.Scan false
  end

  def on_send_end_scan_signal
    n = @wireless.GetNumberOfNetworks.first
    @scan = {}
    n.times do |i|
      @scan[@wireless.GetWirelessProperty(i, 'essid').first] = i
    end
    connect!
  end

  def connect!
    essid = @essid_priority.find { |essid| @scan.has_key? essid }
    if essid
      @wireless.ConnectWireless @scan[essid]
    else
      puts 'No available networks'
      sleep 5
      scan!
    end
  end

  def on_status_changed(state, info)
    case state
    when Wicd::NOT_CONNECTED
      if @last_state != Wicd::NOT_CONNECTED
        on_disconnected
      end
      scan!
    when Wicd::SUSPENDED
      puts 'SUSPENDED'
    when Wicd::CONNECTING
      if info[0] == 'wired'
        puts 'CONNECTING (wired)'
      else
        essid = info[1]
        puts "CONNECTING (wireless) #{essid}"
      end
    when Wicd::WIRELESS
      if @last_state != Wicd::WIRELESS
        on_wireless_connected *info
      end
    when Wicd::WIRED
      if @last_state != Wicd::WIRED
        on_wired_connected *info
      end
    else
      raise "Unknown state #{state}"
    end
    @last_state = state
  end

  def on_disconnected
    puts 'Disconnected'
  end

  def on_wired_connected(ip)
    puts "Connected (#{ip})"
  end

  def on_wireless_connected(ip, network, network_id, strength, bitrate)
    puts "Connected to #{network} (#{ip})"
  end
end

bus = DBus::SystemBus.instance
wicd = Wicd.new bus
main = DBus::Main.new
main << bus
main.run