Expose DNS Servers via public API

[Alan Bateman]

On 30/03/2017 15:36, Norman Maurer wrote:

> Hi there,
>
> I am not sure if this is the correct list for the question but as 
> relate to network I will just try. If its the wrong list please tell 
> me which one would be better fitted.
>
> Is there reason why not expose the DNS Servers configured on a system. 
> These are exposed in sun.net.dns.ResolverConfiguration but not exposed 
> in any public way. Be able to access these would help people that want 
> to do a custom dns lookup (for example non-blocking) like what we do 
> in netty.
> If this is something that would be considered I can come up with a 
> patch for it.
>
One could imagine introducing an API in java.net that exposes more of 
the networking configuration but I think would require debate as to 
whether it's the right thing to do or not (esp. as the existing 
networking APIs are abstracted from whether resolution is done via DNS, 
host files, ..).

An alternative might to see if it is exposed by the JNDI-DNS provider 
(the primary user of ResolverConfiguration and the reason it was 
created). It might already be exposed in the environment.

-Alan
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