This file is indexed.

/lib/systemd/system/dns-clean.service is in pppconfig 2.3.22.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Unit]
Description=Clean up any mess left by 0dns-up

DefaultDependencies=false
Before=network-manager.service systemd-networkd.service networking.service resolvconf.service
After=local-fs.target
Requires=local-fs.target

ConditionPathExists=/etc/ppp/ip-down.d/0dns-down

[Service]
Type=oneshot
ExecStartPre=/bin/mkdir /var/run/pppconfig
ExecStart=/etc/ppp/ip-down.d/0dns-down "0dns-clean"

[Install]
WantedBy=multi-user.target