/lib/udev/rules.d/85-netscript.rules is in netscript-2.4 5.5.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # This file causes network devices to be brought up or down as a result
# of hardware being added or removed, including that which isn't ordinarily
# removable.
# See udev(7) for syntax.
# Allow rfkill for users in the netdev group
KERNEL=="rfkill", MODE="0664", GROUP="netdev"
# Handle allow-hotplug interfaces
SUBSYSTEM=="net", ACTION=="add|remove", RUN+="netscript-hotplug"
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