This file is indexed.

/etc/ppp/ip-down.d/0stunnel4 is in stunnel4 3:5.30-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# if this script gets called, we assume that the machine has lost
# IPv4 connectivity -> restart stunnel (do not stop it, it is possible 
# to have a eth connection)

test -f /etc/default/stunnel4 && . /etc/default/stunnel4
test "$PPP_RESTART" != "0" || exit 0

invoke-rc.d stunnel4 restart