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Re: Discovering the default gateway address
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Re: Discovering the default gateway address


  • Subject: Re: Discovering the default gateway address
  • From: "R. Tyler Ballance" <email@hidden>
  • Date: Sun, 4 Feb 2007 02:31:19 -0600


On Feb 4, 2007, at 12:36 AM, Kay Roepke wrote:

Take a look at the System Configuration framework: <file:/// Developer/ADC Reference Library/documentation/Networking/ Conceptual/SystemConfigFrameworks/index.html#//apple_ref/doc/uid/ TP40001065>.
It can be used to get at the necessary information. In addition to that also take a look at the scutil command line tool, using that to look at the various Setup:/ and State:/ properties should give you a feel for what information you can retrieve.


If you want to do it in your own code (rather than using NSTask to invoke scutil) have a look scutils source code at <http:// darwinsource.opendarwin.org/Current/configd-136.1/scutil.tproj/>


So the best chance I suppose is to rely on reading the keys from the proper entry in the System Configuration framework? (it seems the right key is: State:/Network/Global/IPv4)

This is acceptable I suppose, but I was hoping for a more programmatic means of doing this (such as using sysctl(3) and the flags from route(4), which doesn't seem to want to cooperate regardless), but I guess relying on System Configuration isn't that bad is it? :)


Cheers R. Tyler Ballance: Lead Mac Developer at bleep. software contact: email@hidden | jabber: email@hidden


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References: 
 >Discovering the default gateway address (From: "R. Tyler Ballance" <email@hidden>)
 >Re: Discovering the default gateway address (From: Kay Roepke <email@hidden>)

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