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Make blacklist-helper commands emit a message when successful

Description

Make blacklist-helper commands emit a message when successful

The blacklistd daemon expects to see a message on stdout, instead
of just relying on the exit value from any invoked programs.

Change the pf filtering to create multiple filters, attached under
a the "blacklist/*" anchor point. This prevents the filtering for
each port's filtering rule from overwriting the previously installed
filtering rule. Check for an existing filtering rule for each port,
so the installation of a given filtering rule only happens once.
Reinstalling the same rule resets the counters for the pf rule, and
we don't want that.

Reported by: David Horn (dhorn2000 at gmail.com)
Reviewed by: emaste
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D8081

Details

Committed
lidlOct 4 2016, 11:10 PM
Reviewer
emaste
Differential Revision
D8081: Make blacklist-helper commands emit a message when successful
Parents
rS306694: MFC 303859,305851: Fix a typo and some whitespace nits.
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