Quickboot/dhcpevent at master · ulfalizer/Quickboot · GitHub

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#!/bin/busybox ash
dnsfile=/etc/resolv.conf

case $1 in
  deconfig )
    # Raise interface
    /bin/busybox ip link set dev $interface up

    # Deconfigure interface
    /bin/busybox ip addr flush dev $interface
    ;;
  bound|renew )
    # Configure interface
    /bin/busybox ifconfig $interface $ip netmask $subnet

    # Add default routes
    if [ -n "$router" ]; then
        /bin/busybox ip route del default
        /bin/busybox ip route add default via $router
    fi

    # Clear the list of DNS servers
    > $dnsfile

    # Add domain
    [ -n "$domain" ] && echo "search $domain" > $dnsfile

    # Register DNS servers
    for server in $dns; do
        echo nameserver $server >> $dnsfile
        echo Added DNS server $server
    done
    ;;
esac