This function consults the /etc/hosts.allow and
/etc/hosts.deny files to check if access to service
daemon
should be granted or denied for a client.
daemon
The service name.
address
The client remote address. Can be either an IP address or a domain name.
user
An optional user name.
nodns
If address
looks like domain name then DNS is
used to resolve it to IP address; set nodns
to
TRUE to avoid this.
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