/etc/ppp/ip-up.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.
1 2 3 4 5 6 7 | #!/bin/sh
test -f /etc/default/stunnel4 && . /etc/default/stunnel4
test "$PPP_RESTART" != "0" || exit 0
invoke-rc.d stunnel4 restart
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