Which file to request SIOCGIFMAC on?

[Don Hinton]

On Wednesday 21 February 2007 15:03, nocturnal wrote:
> Hi
>
> Well that's weird, is MAC defined by default at all? I tried searching
> for the definition but couldn't find it.
>
> I never thought it would be this hard just to get the ethernet address
> from an ethernet interface in FreeBSD. I think i'll take a look at the
> netlib source next, something tells me it will be easier to just
> plagiarize their method than going through the kernel source any more.

Have you tried google?  This was asked on freebsd-hackers a few months ago:

http://lists.freebsd.org/pipermail/freebsd-hackers/2006-August/017601.html

hth...
don

>
>
>
> Med vänliga hälsningar
>
> Stefan Midjich aka nocturnal
> [Swehack] http://swehack.se
>
> Pietro Cerutti wrote:
> > On 2/20/07, nocturnal <nocturnal at swehack.se> wrote:
> >> Hi
> >>
> >> 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.
> >
> > The problem isn't with the socket type or options.
> > If you debug ifconfig, you'll find out that the ioctl call always
> > returns -1, and the program goes on to the "goto mac_free" line.
> >
> > Take a look at /usr/src/sys/net/if.c, line 1258
> >
> > Should we deduce that the particular ioctl isn't supported?
> >
> > P.S. I'm forwarding this to freebsd-hackers@ too, so sorry for cross
> > posting
> >
> >> Med vänliga hälsningar
> >>
> >> Stefan Midjich aka nocturnal
> >> [Swehack] http://swehack.se
> >>
> >> 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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-- 
Don Hinton <don.hinton at vanderbilt.edu> or <hintonda at gmail.com>
Institute for Software Integrated Systems (ISIS), Vanderbilt University
tel: 615.480.5667 or 615.870.9728
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