[Bug 243164] blacklistd not handling masks correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243164

--- Comment #8 from Helge Oldach <freebsd at oldach.net> ---
(In reply to Conrad Meyer from comment #7)
> I'm also not exactly in love with the custom file format (with ad-hoc
> C parser and no formal grammar)

Yes, and there are also potential bugs in that hand-rolled parser. Some time
ago I have stumbled over IPv6 address/netmask:

    [2001:679:2807:60::]/64:ssh     stream  *       *               *       *  
   *

versus

    [2001:679:2807:60::/64]:ssh     stream  *       *               *       *  
   *

Only the first case works well, the second case however is silently accepted
without throwing an error, but doesn't work. This should probably be
documented.

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