Olle E. Johansson wrote:
On 13 Mar 2014, at 11:42, Joshua Colp <reviewbo...@asterisk.org
<mailto:reviewbo...@asterisk.org>> wrote:
In case others are wondering as Olle was:
PJLIB-Util (part of pjproject) provides a DNS client which can
optionally (but is highly suggested) to be used with PJSIP. It
provides asynchronous DNS, SRV lookups, multiple record support,
etc. Right now this isn't enabled so we are simply doing A/AAAA
record lookups. The reason it's not enabled is that explicit
nameservers *must* be provided to it when enabling it. It will not
use the system ones by itself. The change up on reviewboard enables
it by default using the system nameservers it finds, but with the
ability to override or completely disable it if a user wants. The
reason I also provide reload functionality is that people in
#asterisk-dev expressed a concern that users may change nameservers
but don't want to restart Asterisk, which is understandable.
Interesting to get answer in another channel... For both of us.
My question still stands - why would anyone want one part of Asterisk
use other DNS servers than the rest of Asterisk and the rest of the
system? If there is something wrong with the system resolver, that
needs to be fixed.
I do not see the need for us to have a configuration option here.
Someone else may have a good reason for it.
I can't guarantee that the code which automatically determines and gets
the nameservers from the system will work on all platforms. It's using
res_init / res_ninit which, depending on the implementation, parses
resolv.conf and stores the information. I think it *should* work but for
cases where it won't the ability to manually set them is there. For most
people you don't even need to know it exists or set it.
--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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