OpenWrt – Rev 4

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#!/bin/sh
. /lib/functions.sh
. /lib/functions/system.sh

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

board=$(board_name)
case $board in
        mqmaker,witi-256m|\
        mqmaker,witi-512m)
                partname=factory
                offset=$((0xe000))
        ;;
        *)
                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')
else
        set -- $(gen_mac | convert_hex)
        set -- $(printf %02x $(( (0x$1 & 0xfe) | 0x02 ))) $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"