InvizBox Go – MAC address change

fixup-mac-address

#!/bin/sh
# Replace this in `/sbin/fixup-mac-address`
. /lib/functions.sh
. /lib/functions/system.sh
. /lib/ramips.sh

partname=""
offset=""
NEW_MAC=
YES=

board=$(ramips_board_name)
case $board in
	invizboxgo)
		partname=factory
		offset=$((0x0004))
	;;
	*)
		echo "Unsupported board"
		exit 1
	;;
esac

while [ -n "$1" ]; do
	case "$1" in
		??:??:??:??:??:??) NEW_MAC="$1";;
		-y) YES=1;;
		*)
			cat <<EOF
Unknown option/argument '$1'
Usage: $0 [-y] [<macaddr>]
EOF
			exit 1
		;;
	esac
	shift
done

ask_bool() {
	local message="$1"
	local default="$((! ${2:-0}))"
	[ -n "$YES" ] && return 0
	echo -n "$message "
	read opt
	case "$opt" in
		y|Y) return 0;;
		n|N) return 1;;
		*) return $default;;
	esac
}

convert_hex() {
	hexdump -e '/1 "%02x "'
}

gen_mac() {
	dd if=/dev/urandom bs=6 count=1 2>/dev/null
}

mac="$(mtd_get_mac_binary $partname $offset)"
case "$mac" in
	00:00:00:00:00:00);;
	ff:ff:ff:ff:ff:ff);;
	*)
		echo "Current MAC address: $mac"
		ask_bool "Overwrite (y/N)?" 0 || exit
	;;
esac

if [ -n "$NEW_MAC" ]; then
	set -- $(echo "$NEW_MAC" | sed 's,:, ,g')
	set -- $(printf %02x $(( (0x$1 & 0xfc) | 0x00 ))) $2 $3 $4 $5 $6
else
	set -- $(gen_mac | convert_hex)
	set -- $(printf %02x $(( (0x$1 & 0xfc) | 0x00 ))) $2 $3 $4 $5 $6
fi
echo "New MAC address: $1:$2:$3:$4:$5:$6"
ask_bool "Write to EEPROM (y/N)?" || exit

part=$(find_mtd_part "$partname")
[ -n "$part" ] || exit
echo -ne "\x$1\x$2\x$3\x$4\x$5\x$6" | dd of=$part conv=notrunc bs=1 count=6 seek=$offset 2>/dev/null
echo "Done"

mac-change

#!/bin/sh /etc/rc.common
# Run the MAC change script on boot
# Put this into `/etc/init.d/`
# Copyright (C) 2007 OpenWrt.org

START=10

start() {
        echo Set new MAC address
        # Sets a new MAC address in EEPROM
        /sbin/fixup-mac-address -y
}

Change InvizBox Go MAC address

The mt7601e chipset on the InvizBox Go does not allow to change the MAC address via ifconfig or luci. However, the MAC address of the WiFi interface is stored in EEPROM and by overwriting the value, you can nevertheless change the MAC address.

Replace the /sbin/fixup-mac-address script with this one to change the MAC address of the WiFi Interface of your InvizBox Go. After you've changed it, you have to reboot the box in order to set it on the interface.

Usage:

/sbin/fixup-mac-address [-y] [<macaddr>]

You can either specify a new MAC address with the [<macaddr>] option or let the script generate a new one automatically. The new MAC address will be written to the EEPROM without further confirmation if you specify the -y option.

If you want to change the MAC address on every boot, simply put the mac-change script into /etc/init.d�/ Don't forget to make the script executable and enable it:

$ chmod +x /etc/init.d/mac-change
$ /etc/init.d/mac-change enable