Re: Bypass Network System Preferences for DNS lookup
Re: Bypass Network System Preferences for DNS lookup
- Subject: Re: Bypass Network System Preferences for DNS lookup
- From: Jean-Daniel Dupas <email@hidden>
- Date: Fri, 2 Jul 2010 21:04:10 +0200
Le 2 juil. 2010 à 19:33, Jens Alfke a écrit :
>
> On Jul 1, 2010, at 7:42 PM, Michael Jackson wrote:
>
>> Is there any way to bypass the system network preferences for DNS
>> servers to perform all DNS lookups from within a Cocoa app? For
>> example, I would like my app to always make DNS queries to a
>> particular pair of DNS servers.
>
> I’m pretty sure that’s not directly possible, since DNS lookups are done by a shared daemon process, not by individual apps.
>
> What you could do is incorporate direct DNS-lookup code into your app (I’m sure there are open-source libraries for it), use that to resolve the hostname to an IP address, and then use that IP address with your favorite networking APIs instead of the hostname. (If you’re using NSURLConnection, you’d need to transform the raw address into dotted-quad form, or the equivalent for IPv6.)
FWIW, dig can do that, as you can specify a server when you use it to test DNS query:
http://www.opensource.apple.com/source/bind9/bind9-31/bind9/bin/dig/
-- Jean-Daniel
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