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Re: trying to build configd, understanding dns more
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Re: trying to build configd, understanding dns more


  • Subject: Re: trying to build configd, understanding dns more
  • From: "Quinn \"The Eskimo!\"" <email@hidden>
  • Date: Mon, 30 Mar 2015 09:05:38 +0100

On 27 Mar 2015, at 20:44, marty leisner <email@hidden> wrote:

> I want to understand more about what scutil --dns does.
>
> Since I have the source, I thought I could easily build it (my mistake).

Yeah, my experience is that Darwin source rarely builds easily.

It's still a useful tool though.  In this case of --dns, it calls an internal routine, dns_configuration_copy:

<http://www.opensource.apple.com/source/configd/configd-699.1.5/dnsinfo/dnsinfo_copy.c>

which XPCs over to a configd-side routine, _dnsinfo_copy:

<http://www.opensource.apple.com/source/configd/configd-699.1.5/dnsinfo/dnsinfo_server.c>

which calls _libSC_info_server_get_data to get the data:

<http://www.opensource.apple.com/source/configd/configd-699.1.5/libSystemConfiguration/libSystemConfiguration_server.c>

It seems that the DNS data is set by a call to _libSC_info_server_set_data in _dns_configuration_store:

<http://www.opensource.apple.com/source/configd/configd-699.1.5/dnsinfo/dnsinfo_server.c>

which, in turn, is called by dns_configuration_set in the IPMonitor plug-in, where the actual logic lies.

<http://www.opensource.apple.com/source/configd/configd-699.1.5/Plugins/IPMonitor/dns-configuration.c>

Have fun (-:

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware



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