/etc/strongswan.d/charon/lookip.conf is in libcharon-extra-plugins 5.5.1-4+deb9u4.
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 | lookip {
# Whether to load the plugin. Can also be an integer to increase the
# priority of this plugin.
load = yes
# Socket provided by the lookip plugin.
# socket = unix://${piddir}/charon.lkp
}
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