Just in case anyone needs a Centrify Extension Attribute:
#!/bin/sh
mode=`adinfo | grep "CentrifyDC mode" | awk '{print $3}'`
if [ "$mode" == "connected" ]; then
echo "<result>Connected</result>"
elif [ "$mode" == "disconnected" ]; then
echo "<result>Disconnected</result>"
else
echo "<result>NA</result>"
fi