wpa_action IFACE ACTION

       wpa_action is a shell script designed to control the ifupdown framework
       according to  ACTION  events  received  from  wpa_supplicant.   wpa_cli
       receives  CONNECTED and DISCONNECTED events from wpa_supplicant via the
       crtl_iface socket and gives the ACTION event to the  wpa_action  script
       as an argument, along with the IFACE to be acted upon.

       wpa_action   also   receives  an  environment  variable  from  wpa_cli,
       WPA_ID_STR, containing an alphanumeric identification  string  for  the
       CURRENT  network  block. WPA_ID_STR is provided by the 'id_str' network
       block option of wpa_supplicant.conf, and provides a means  to  map  the
       ACTION to a LOGICAL interface configured in the interfaces file.

       If  either  the  ifupdown  interfaces  or ifstate file cannot be found,
       wpa_action will exit silently (status 0). wpa_action  will  search  the
       following locations for their existence:

       Network interface to be acted upon, for example 'eth1' or 'wlan0'.

       An ACTION to be performed on the IFACE.

              wpa_supplicant     has     completed    authentication.     ifup
              IFACE=WPA_ID_STR is invoked and the action is logged to  syslog.
              Network  settings  for  the  LOGICAL  interface  WPA_ID_STR  are

              wpa_supplicant    has    detected     disconnection.      ifdown
              IFACE=WPA_ID_STR  is invoked and the action is logged to syslog.
              Network  settings  for  the  LOGICAL  interface  WPA_ID_STR  are

       stop   The  'stop' ACTION is a called manually by the user, to stop the
              wpa_cli daemon, invoke ifdown IFACE (if the IFACE is present  in
              the ifstate file) and stop the wpa_supplicant daemon.

       reload The  'reload'  ACTION  can  be used to reload the wpa_supplicant
              configuration file specified by wpa-roam . 'restart' is  a  syn-
              onym  for 'reload' and can be used equally. The action is logged
              to /var/log/wpa_action.log.

       An alphanumeric identification string provided by the 'id_str'  network
       block  option  of  wpa_supplicant.conf  is exported to wpa_action as an
       environment variable, WPA_ID_STR. When 'id_str' is not  configured  for
       the  CURRENT  network  block,  'default'  is substituted for the absent

       Otherwise, wpa_action is given as an argument to a wpa_cli daemon.

              wpa_cli -i eth1 -a /sbin/wpa_action -B

       This can be done by using the wpa-roam option in the  interfaces  file.
       wpa-roam takes one argument, a user provided wpa_supplicant.conf file.

       The inet METHOD must be 'manual' for this interface, as it will be con-
       figured according to wpa_cli action events.  Also  supply  a  'default'
       interfaces  stanza  using the dhcp inet METHOD so that networks without
       an 'id_str' option can fallback to attempting  to  receive  an  ip  via
       dhcp.  If  one  or more networks requires additional network configura-
       tion, provide an unique 'id_str' for each network,  and  an  interfaces
       stanza  using  the 'id_str' value as a LOGICAL interface. The following
       interfaces file is configured to use dhcp for any  network  without  an
       'id_str', a static ip for the network with an 'id_str' of 'home_static'
       and dhcp plus an additional post-up command for  the  network  with  an
       'id_str' of 'uni'.

       An  example  wpa_supplicant.conf configured to roam between 3 different




       The corresponding interfaces file  would  contain  LOGICAL  interfaces,
       that  correlate  to  each unique 'id_str' provided by the configuration

              iface eth1 inet manual
                   wpa-driver wext
                   wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

              iface default inet dhcp

              iface uni inet dhcp

              iface home_static inet static

                                  26 May 2006                    WPA_ACTION(8)
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