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From William A Rowe Jr <wr...@rowe-clan.net>
Subject Re: [PATCH] Add "FreeListen" to support IP_FREEBIND
Date Tue, 08 Mar 2016 05:32:50 GMT
On Mar 7, 2016 21:59, "Yehuda Katz" <yehuda@ymkatz.net> wrote:
>
> On Mon, Mar 7, 2016 at 9:06 PM, William A Rowe Jr <wrowe@rowe-clan.net>
wrote:
>>
>> On Mar 7, 2016 13:54, "Jan Kalu┼ża" <jkaluza@redhat.com> wrote:
>> >
>> > On 03/07/2016 04:17 PM, Jim Jagielski wrote:
>> >>
>> >> Intstead of adding YAD (yet another directive ;) ), would it
>> >> be possible to somehow leverage Listen itself, maybe with some
>> >> sort of flag?
>> >
>> >
>> > Yes, that would be quite possible. I was thinking about that way, but
I have chosen YAD as a first approach. If you think adding flag to Listen
is better way, I can rework my patch.
>> >
>> > Regards,
>> > Jan Kaluza
>> >
>>
>> Reviewing the behavior, an unadorned new directive makes more sense to
me than cluttering Listen, which already takes one optional protocol
behavior argument.
>>
>> The same handler can process both directives.
>
> A benefit of using a flag is: what happens if the default changes at some
point? YAD would need to be created to go back to the old behavior - which
would make things more complicated.  Is it possible to use something like a
plus/minus or question mark symbol with each address:port which would allow
the default to be changed at some future point without requiring having
this discussion again?
>
> Example:
> Listen ?192.170.2.1:80  # Use IP_FREEBIND to listen when IP is available
(new behavior)
> Listen +192.170.2.5:8000  # Require IP to be available (old behavior)
> Listen [2001:db8::a00:20ff:fea7:ccea]:80  # Current default behavior (old)

Interesting point, I raised the same consideration for piped logging syntax
some years ago.  But at that time it was the consensus that the default
would change with the next major version.

I see small probably that this would become a default behavior, from the
perspective of robustness alone.  I see that you simply suggest a tri-state
(and trailing '?' Vs '!' makes more intuitive sense to me), but I'm not
seeing a consensus yet that the default would change in the future.

The same can be accomplished by adding a third 'FixedListen' directive,
leaving Listen itself free to switch behaviors.

But from the migration perspective, I'd be loath to switch any default
Listen behavior without the admin's explicit intervention.  POLS.

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