From owner-freebsd-wireless@FreeBSD.ORG  Thu Oct 13 16:16:58 2011
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Date: Thu, 13 Oct 2011 10:16:57 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: wireless@freebsd.org
Subject: Re: Detecting a wireless interface
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On Thu, 13 Oct 2011, Adrian Chadd wrote:

> I can't think of anything, sorry. You may have to write a command line
> app that does a net80211 ioctl to see, or maybe there's a way to query
> the media type to tell you whether it's wifi or not.

Hadn't looked at it before, but parsing ifconfig output is what was used 
already (bsdinstall netconfig, in this case).  I just reused it:
   http://www.freebsd.org/cgi/query-pr.cgi?pr=161547