<?xml version=”1.0″ encoding=”UTF-8″?>
<!DOCTYPE plist PUBLIC “-//Apple Computer//DTD PLIST 1.0//EN”
“http://www.apple.com/DTDs/PropertyList-1.0.dtd”>
<plist version=”1.0″>
<dict>
<key>Label</key>
<string>tech.inhelsinki.nl.locationchanger</string>
<key>ProgramArguments</key>
<array>
<string>/Users/USERNAME/bin/locationchanger</string>
</array>
<key>WatchPaths</key>
<array>
<string>/Library/Preferences/SystemConfiguration</string>
</array>
</dict>
</plist>

#!/bin/bash
# automatically change configuration of Mac OS X based on location
# author: Onne Gorter
# modified: Reverb CS Chu
# original-url: http://tech.inhelsinki.nl/locationchanger/
# version: 0.4.1
USERNAME="<em><strong>帳號</strong></em>"
PASSWORD="<em><strong>密碼</strong></em>"
# redirect all IO to /dev/null (comment this out if you want to debug)
exec 1>/dev/null 2>/dev/null
# get a little breather before we get data for things to settle down
sleep 2
# get various system information
SSID=`/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -I | grep ‘ SSID:’ | cut -d ‘:’ -f 2 | tr -d ‘ ‘`
if [ $SSID == "VGHTCAP" ]; then
POSTLOGIN="buttonClicked=4&username=$USERNAME&password=$PASSWORD"
/opt/local/bin/wget -O- http://172.23.253.249/cgi-bin/login –post-data=$POSTLOGIN -T2 -t2
fi
exit 0