OpenWrt – Rev 1

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#!/bin/sh
# Copyright (C) 2018 OpenWrt.org

RECOVERY_PART=/dev/mmcblk0p1

preinit_set_mac_address() {
        local mac

        . /lib/functions.sh
        . /lib/functions/system.sh

        case $(board_name) in
        "unielec,u7623"*)
                if [ -b $RECOVERY_PART ]; then
                        insmod nls_cp437
                        insmod nls_iso8859-1
                        insmod fat
                        insmod vfat
                        mkdir -p /tmp/recovery
                        mount -o rw,noatime $RECOVERY_PART /tmp/recovery

                        if [ -f "/tmp/recovery/mac_addr" ];
                        then
                                mac=$(cat /tmp/recovery/mac_addr)
                        else
                                mac=$(cat /sys/class/net/eth0/address)
                                echo "$mac" > /tmp/recovery/mac_addr
                        fi

                        sync
                        umount /tmp/recovery
                        rm -rf /tmp/recovery
                fi

                ip link set dev wan address $mac 2> /dev/null

                mac=$(macaddr_add $mac 1)

                ip link set dev lan0 address $mac 2>/dev/null
                ip link set dev lan1 address $mac 2>/dev/null
                ip link set dev lan2 address $mac 2>/dev/null
                ip link set dev lan3 address $mac 2>/dev/null
                ;;
        esac
}

boot_hook_add preinit_main preinit_set_mac_address