entries in hosts.deny can be duplicated

[sn3ak]

I haven't attempted to look in the database, but due to issue #1 and entries not being removed from hosts.deny. I can verify, manual or automatic blacklist will add another entry into hosts.deny.

I suspect it would be wise to verify if an ip is already listed in the file, or with a working cleanup, make sure all copies of the ip is removed.

[msimerson]

The database is keyed off the IP, so duplication is not possible. Because of how IPs are removed from hosts.deny, all matches in the hosts.deny are removed when delisting.

I would accept a patch that optionally checks for the existence of an IP before adding it to hosts.deny, but I won't write it. In the odd case where an IP gets listed multiple times (because of a DB/tcpd file mismatch), it doesn't hurt anything. The amount of resources needed to parse the file before every write would greatly exceed the cost of having a few duplicated IPs.