1#!/bin/sh
2. /lib/functions.sh
3. /lib/functions/system.sh
4
5partname=""
6offset=""
7NEW_MAC=
8YES=
9
10case "$(cat /tmp/sysinfo/board_name)" in
11	witi)
12		partname=factory
13		offset=$((0xe000))
14	;;
15	*)
16		echo "Unsupported board"
17		exit 1
18	;;
19esac
20
21while [ -n "$1" ]; do
22	case "$1" in
23		??:??:??:??:??:??) NEW_MAC="$1";;
24		-y) YES=1;;
25		*)
26			cat <<EOF
27Unknown option/argument '$1'
28Usage: $0 [-y] [<macaddr>]
29EOF
30			exit 1
31		;;
32	esac
33	shift
34done
35
36ask_bool() {
37	local message="$1"
38	local default="$((! ${2:-0}))"
39	[ -n "$YES" ] && return 0
40	echo -n "$message "
41	read opt
42	case "$opt" in
43		y|Y) return 0;;
44		n|N) return 1;;
45		*) return $default;;
46	esac
47}
48
49convert_hex() {
50	hexdump -e '/1 "%02x "'
51}
52
53gen_mac() {
54	dd if=/dev/urandom bs=6 count=1 2>/dev/null
55}
56
57mac="$(mtd_get_mac_binary $partname $offset)"
58case "$mac" in
59	00:00:00:00:00:00);;
60	ff:ff:ff:ff:ff:ff);;
61	*)
62		echo "Current MAC address: $mac"
63		ask_bool "Overwrite (y/N)?" 0 || exit
64	;;
65esac
66
67if [ -n "$NEW_MAC" ]; then
68	set -- $(echo "$NEW_MAC" | sed 's,:, ,g')
69else
70	set -- $(gen_mac | convert_hex)
71	set -- $(printf %02x $(( (0x$1 & 0xfe) | 0x02 ))) $2 $3 $4 $5 $6
72fi
73echo "New MAC address: $1:$2:$3:$4:$5:$6"
74ask_bool "Write to EEPROM (y/N)?" || exit
75
76part=$(find_mtd_part "$partname")
77[ -n "$part" ] || exit
78echo -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
79echo "Done"
80