MTK WiFi MAC address randomizer

mtk_set_random_wifi_mac.sh

#!/system/bin/sh

# MTK WiFi MAC address randomizer
# BLITZ Y2K+14
# REQ: root, busybox, MTK device
# HOWTO: copy to /data or /system, use chmod 755

# Uncomment to view debug output
# set -xv

show_help()
{
	echo Valid arguments are:
	echo "-randomize    Make backup and randomize WiFi MAC address"
	echo "-backup       Make backup only"
	echo "-restore      Restore backup"
}

if [ $# -eq 0 ]
then
	echo No arguments specified!
	show_help
	exit
fi

WIFI_MAC_FILE=/data/nvram/APCFG/APRDEB/WIFI
BACKUP_FILE=$WIFI_MAC_FILE.bak

check_mtk()
{
	if ! ls $WIFI_MAC_FILE &> /dev/null
	then
		echo WiFi MAC file not found, probably not MTK device, exiting
		exit 
	fi
}


backup_mac()
{
	if ! ls $BACKUP_FILE &> /dev/null
	then
		echo Created backup
		busybox cp -p $WIFI_MAC_FILE $BACKUP_FILE
	else
		echo Backup already exists
	fi
}

get_wifi_status()
{
	WIFI_STATUS=`getprop wlan.driver.status`

	if [ x$WIFI_STATUS == "xok" ]
	then
		return 0
	else
		return 1
	fi
}

toggle_wifi()
{
	case "$1" in
	
	0)
		if get_wifi_status
		then
			echo Disabling WiFi
			svc wifi disable
			RE_ENABLE_WIFI=true
		else
			echo WiFi already disabled
		fi
		;;
	1)
		echo Enabling WiFi
		svc wifi enable
		;;
	esac
}

case "$1" in

'-backup')
			check_mtk
			backup_mac
			echo Exiting
			exit
			;;

'-restore')
			if ! ls $BACKUP_FILE &> /dev/null
			then
				echo Backup not found, cant restore, exiting
				exit
			else
				toggle_wifi 0
		
				echo Deleting WiFi MAC file
				rm $WIFI_MAC_FILE
		
				echo Restoring WiFi MAC file from backup
				busybox cp -p $BACKUP_FILE $WIFI_MAC_FILE
			fi
			;;

'-randomize')
			check_mtk
			backup_mac
			toggle_wifi 0

			echo Randomizing MAC
			busybox dd if=/dev/urandom of=$WIFI_MAC_FILE seek=7 bs=1 count=3 conv=notrunc 2> /dev/null
			chmod 440 $WIFI_MAC_FILE
			;;
*)
			echo Unrecognized command, exiting
			show_help
			exit
			;;
esac

if [ x$RE_ENABLE_WIFI == "xtrue" ]
then
	toggle_wifi 1
fi

echo All done, exiting