This file is indexed.

/etc/strongswan.d/charon/socket-default.conf is in strongswan-ike 5.1.2-0ubuntu2.

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

The actual contents of the file can be viewed below.

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socket-default {

    # Firewall mark to set on outbound packets.
    # fwmark =

    # Whether to load the plugin. Can also be an integer to increase the
    # priority of this plugin.
    load = yes

    # Set source address on outbound packets, if possible.
    # set_source = yes

    # Listen on IPv4, if possible.
    # use_ipv4 = yes

    # Listen on IPv6, if possible.
    # use_ipv6 = yes

}