IFACE=""
for IFACE in $(ls /sys/class/net/ | grep -E '^(eth|usb)[0-9]+$'); do
	driver_path=$(readlink -f "/sys/class/net/$IFACE/device/driver" 2>/dev/null)
	if [ -n "$driver_path" ] && echo "$driver_path" | grep -qE 'cdc_ether|rndis_host'; then
		break
	fi
done

export IFACE