[Halevt-dev] Wifi killswitch events

[Ben Rich]

Hi,

My laptop (ThinkPad t400s) has a physical kill switch for the wifi.  I
would like to execute code to connect/disconnect from wireless
networks when the switch is turned on or off.  Is halevt an
appropriate tool for doing this?  Specifically, I noticed that there
is a device with capability 'killswitch':

$ hal-device /org/freedesktop/Hal/devices/pci_8086_84_rfkill_phy1_wlan
udi = '/org/freedesktop/Hal/devices/pci_8086_84_rfkill_phy1_wlan'
  info.vendor = 'Intel Corporation'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'rfkill'  (string)
  info.interfaces = { 'org.freedesktop.Hal.Device.KillSwitch' } (string list)
  killswitch.type = 'wlan'  (string)
  killswitch.state = 1  (0x1)  (int)
  killswitch.access_method = 'rfkill'  (string)
  killswitch.name = 'phy1'  (string)
  info.subsystem = 'rfkill'  (string)
  info.product = 'phy1 wlan Killswitch'  (string)
  linux.sysfs_path =
'/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/ieee80211/phy1/rfkill1'
 (string)
  info.parent = '/org/freedesktop/Hal/devices/pci_8086_84'  (string)
  info.udi = '/org/freedesktop/Hal/devices/pci_8086_84_rfkill_phy1_wlan'
 (string)
  info.addons.singleton = { 'hald-addon-rfkill-killswitch' } (string list)
  info.category = 'killswitch'  (string)
  info.capabilities = { 'killswitch' } (string list)

When the wifi is on, the killswitch.state property is set to 1, and
when it is off it is set to 2.  So, I created the following
configuration file:

$ cat /etc/halevt/wifi_rfkill.xml
<?xml version="1.0" encoding="UTF-8"?>
<halevt:Configuration version="0.1"
xmlns:halevt="http://www.environnement.ens.fr/perso/dumas/halevt.html";>

<halevt:Device match="hal.killswitch.type = wlan">
   <halevt:Property name="hal.killswitch.state">
       <halevt:Action value="1" exec="/etc/rc.d/net-profiles restart"/>
   </halevt:Property>
</halevt:Device>

<halevt:Device match="hal.killswitch.type = wlan">
   <halevt:Property name="hal.killswitch.state">
       <halevt:Action value="2" exec="/etc/rc.d/net-profiles stop"/>
   </halevt:Property>
</halevt:Device>

</halevt:Configuration>

At the moment this is not working.  Maybe someone can tell me if I at
least have the right idea.  The other thing I would like to know is
how to debug such a script.  Does halevt log its actions?  Many thanks
for your help.

Sincerely,
Ben Rich