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