/etc/strongswan.d/charon/duplicheck.conf is in strongswan-plugin-duplicheck 5.1.2-0ubuntu2.
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 10 11 12 13 | duplicheck {
# Enable duplicheck plugin (if loaded).
# enable = yes
# Whether to load the plugin. Can also be an integer to increase the
# priority of this plugin.
load = yes
# Socket provided by the duplicheck plugin.
# socket = unix://${piddir}/charon.dck
}
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