target/linux/ramips/base-files/sbin/fixup-mac-address

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