OpenWrt – Rev 4

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# Copyright (C) 2006-2013 OpenWrt.org

get_mac_binary() {
        local path="$1"
        local offset="$2"

        if [ -z "$path" ]; then
                echo "get_mac_binary: file $path not found!" >&2
                return
        fi

        hexdump -v -n 6 -s $offset -e '5/1 "%02x:" 1/1 "%02x"' $path 2>/dev/null
}

find_mtd_chardev() {
        local INDEX=$(find_mtd_index "$1")
        local PREFIX=/dev/mtd

        [ -d /dev/mtd ] && PREFIX=/dev/mtd/
        echo "${INDEX:+$PREFIX$INDEX}"
}

mtd_get_mac_ascii()
{
        local mtdname="$1"
        local key="$2"
        local part
        local mac_dirty

        part=$(find_mtd_part "$mtdname")
        if [ -z "$part" ]; then
                echo "mtd_get_mac_ascii: partition $mtdname not found!" >&2
                return
        fi

        mac_dirty=$(strings "$part" | sed -n 's/^'"$key"'=//p')

        # "canonicalize" mac
        [ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
}

mtd_get_mac_binary() {
        local mtdname="$1"
        local offset="$2"
        local part

        part=$(find_mtd_part "$mtdname")
        get_mac_binary "$part" "$offset"
}

mtd_get_mac_binary_ubi() {
        local mtdname="$1"
        local offset="$2"

        . /lib/upgrade/nand.sh

        local ubidev=$(nand_find_ubi $CI_UBIPART)
        local part=$(nand_find_volume $ubidev $1)

        if [ -z "$part" ]; then
                echo "mtd_get_mac_binary: ubi volume $mtdname not found!" >&2
                return
        fi

        hexdump -v -n 6 -s $offset -e '5/1 "%02x:" 1/1 "%02x"' /dev/$part 2>/dev/null
}

mtd_get_part_size() {
        local part_name=$1
        local first dev size erasesize name
        while read dev size erasesize name; do
                name=${name#'"'}; name=${name%'"'}
                if [ "$name" = "$part_name" ]; then
                        echo $((0x$size))
                        break
                fi
        done < /proc/mtd
}

macaddr_add() {
        local mac=$1
        local val=$2
        local oui=${mac%:*:*:*}
        local nic=${mac#*:*:*:}

        nic=$(printf "%06x" $((0x${nic//:/} + $val & 0xffffff)) | sed 's/^\(.\{2\}\)\(.\{2\}\)\(.\{2\}\)/\1:\2:\3/')
        echo $oui:$nic
}

macaddr_setbit_la()
{
        local mac=$1

        printf "%02x:%s" $((0x${mac%%:*} | 0x02)) ${mac#*:}
}

macaddr_2bin()
{
        local mac=$1

        echo -ne \\x${mac//:/\\x}
}

macaddr_canonicalize()
{
        local mac="$1"
        local canon=""

        mac=$(echo -n $mac | tr -d \")
        [ ${#mac} -gt 17 ] && return
        [ -n "${mac//[a-fA-F0-9\.: -]/}" ] && return

        for octet in ${mac//[\.:-]/ }; do
                case "${#octet}" in
                1)
                        octet="0${octet}"
                        ;;
                2)
                        ;;
                4)
                        octet="${octet:0:2} ${octet:2:2}"
                        ;;
                12)
                        octet="${octet:0:2} ${octet:2:2} ${octet:4:2} ${octet:6:2} ${octet:8:2} ${octet:10:2}"
                        ;;
                *)
                        return
                        ;;
                esac
                canon=${canon}${canon:+ }${octet}
        done

        [ ${#canon} -ne 17 ] && return

        printf "%02x:%02x:%02x:%02x:%02x:%02x" 0x${canon// / 0x} 2>/dev/null
}