WiFi Radar HOWTO

Environmental Variables in Connect and Disconnect Scripts

by Sean Robinson

There are two points in each of the connecting and disconnecting phases in which custom scripts can be executed through the shell. These are (under normal circumstances):

1. connect pre-script
2. connect post-script
3. disconnect pre-scipt
4. disconnect post-script

The following environment variables are set in the shell environment in which all four custom scripts are executed:

• WIFIRADAR_IF is the network interface which is connecting or disconnecting
• WIFIRADAR_PROFILE is the network profile from which configuration information is read; added in WR v2.0.s06
• WIFIRADAR_ENCMODE is the encryption mode (i.e. none, wep, or wpa) used to associate with the AP; added in WR v2.0.s06
• WIFIRADAR_SECMODE is the security mode (i.e. empty string, open, restricted); added in WR v2.0.s06

The following variables are set in the shell environment in which the connect post-script and disconnect pre-script are executed.

• WIFIRADAR_IP is the current IP address
• WIFIRADAR_ESSID is the current ESSID
• WIFIRADAR_BSSID is the current BSSID

A sample connect pre-script:

#!/bin/sh # WiFi Radar connection pre-script # if [ "$WIFIRADAR_IF" = "ra0" ]; then iwpriv ra0 ENCMODE=$WIFIRADAR_ENCMODE iwpriv ra0 SECURITY=$WIFIRADAR_SECMODE fi

A sample connect post-script:

#!/bin/sh # WiFi Radar connection post-script # if [ "$WIFIRADAR_PROFILE" = "WinterPalace:" ]; then /etc/rc.d/rc.privoxy start # update dyndns.org record /usr/local/sbin/ddclient -i $WIFIRADAR_IP fi if [ "$WIFIRADAR_ESSID" = "HOME" ]; then mount -t nfs home-nfs:/home/sean $HOME/sean/fileserver fi

A sample disconnect post-script:

#!/bin/sh # WiFi Radar disconnection post-script # if [ "$WIFIRADAR_PROFILE" = "WinterPalace:" ]; then /etc/rc.d/rc.privoxy stop fi /bin/hostname $(cat /etc/HOSTNAME | cut -f1 -d .) /bin/domainname $(cat /etc/HOSTNAME | cut -f2- -d .)