set mac address depending on device name

sh

setup_mac_address() {

  local device=$1
  local mac=$(ip link show $device | grep "link/ether\b" | awk '{print $2}')

  [ "$mac" = "00:00:00:00:00:00" ] || return

  local interfaces=`rtcap -l`
  if [ "$interfaces" = "" ]; then
    return
  fi

  # eth0   : F4:49:EF:F0:00:00
  # eth1   : F4:49:EF:F0:01:00
  # enp1s0 : F4:49:EF:F1:01:00
  # enp2s1 : F4:49:EF:F1:02:01
  # enp6s0 : F4:49:EF:F1:06:00
  # eno1s0 : F4:49:EF:F2:01:00

  for iface in $interfaces
  do
    if [ "$iface" == "$device" ]; then
      local ids=("0" "0" "0")

      case $device in
        eth*) ids[0]="0";;
        enp*) ids[0]="1";;
        *) ids[0]="2";;
      esac

      local index=1
      numbers=$(echo $device | grep -o -E '[0-9]+')
      for id in $numbers
      do
        ids[$index]=$id

        index=$(($index + 1))
        [ $index -gt 2 ] && break
      done

      local ID0=${ids[0]:${#ids[0]}-1:1}
      local ID1=${ids[1]:${#ids[1]}-2:2}
      local ID2=${ids[2]:${#ids[2]}-2:2}

      /usr/bin/ip link set dev $device address $(printf "F4:49:EF:F%01d:%02d:%02d\n" $ID0 $ID1 $ID2)
      /usr/bin/ip link set dev $device up

      break
    fi
  done
}