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Date:      Tue, 20 Feb 2007 23:33:53 +0100
From:      nocturnal <>
To:        Chuck Swiger <>
Subject:   Re: Which file to request SIOCGIFMAC on?
Message-ID:  <>
In-Reply-To: <>
References:  <> <>

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The original plan is to only run it on FreeBSD 5 and higher, actually 
only 6 by now. It's a program i'm writing for work and at work the most 
active servers run FreeBSD 6 and are updated frequently. The ones with 
older versions don't run anything of interest.

I am buying a MacBook for personal use though so it would be nice to run 
it on osx. I wouldn't like to start using another library just to get 
the hardware address of an interface though, that seems kinda overkill 
for what should be a simple task. The program is already using libpcap 
but that is included in FreeBSD by default so you don't have to install it.

Do you have any idea of why i'm getting this error from ioctl when i'm 
doing what the manual says i should do? I am of course running it as 
root to because the libpcap operations require it.

What might help me is to take a look at the source of that 
libnet_get_hwaddr function in libnet. I'll try that, thank you very much 
for the tip.

So far i've been trying to look at the source for ifconfig to figure out 
how it gets the hardware address. Of course it uses SIOCGIFMAC but i 
can't find the socket it opens because i can't find where it uses the 
maclabel_status function.

Med vänliga hälsningar

Stefan Midjich aka nocturnal

Chuck Swiger wrote:
> On Feb 20, 2007, at 1:10 PM, nocturnal wrote:
>> I'm trying to get the ethernet address and from the manuals i 
>> understand that i need the ifreq structure for this. So i'm trying to 
>> request SIOCGIFMAC with ioctl on a socket of type SOCK_DGRAM.
> If you're just targetting FreeBSD >= 5.x platforms, your current 
> approach is reasonable (assuming you can fix whatever the problem is); 
> if you're targetting other platforms such FreeBSD 4, Dfly, OS X, or SysV 
> things like Solaris, try installing the libnet port and invoke 
> libnet_get_hwaddr().
> ---Chuck

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