Thread: Openvpn autostart based on wlan ssid
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Eris is offline Eris
2008-03-28 , 09:10
Posts: 31 | Thanked: 13 times | Joined on Mar 2008 @ Germany
#1
At home and at university our wlan is secured by openvpn so id like to have it started automatically when i connect to the wlan. So i wrote two little scripts to do that (sure you could also have some shortcuts to start openvpn but this is maybe for a little more comfort). Everytime a interface goes up or down all scripts in /etc/network/if-up.d or if-down.d are started. when you connect to a wlan the ssid is set in the shell variable $ICD_CONNECTION_ID. So this we take to decide which wlan we connected to and easy as that just rename your openvpn config file like the ssid of your wlan (ssid.conf) and with the two scripts it should start when going online and go down when going offline.

add a file (maybe call it ovpnauto) to /etc/network/if-up.d/ and put the following in it:

Code:
#!/bin/sh

OPENVPN=/etc/init.d/openvpn

if [ ! -x $OPENVPN ]; then
  exit 0
fi

if [ -n "$ICD_CONNECTION_ID" ]; then
  CONF=/etc/openvpn/$ICD_CONNECTION_ID.conf
  if [ ! -f $CONF ]; then
    exit 0
  fi
  $OPENVPN start $ICD_CONNECTION_ID
fi
then another on in /etc/network/if-down.d with this code in it:

Code:
#!/bin/sh

OPENVPN=/etc/init.d/openvpn

if [ ! -x $OPENVPN ]; then
  exit 0
fi

if [ $IFACE = "wlan0" ]; then
  $OPENVPN stop
fi
after that the two files must be set executable by doing a chmod 700 $filename on them.

Now when you connect to your wlan if there is a matching openvpn config it will be started (matching to the ssid)
 

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