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.
daemonThe service name.
addressThe client remote address. Can be either an IP address or a domain name.
userAn 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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