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

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