Re: Which file to request SIOCGIFMAC on?
- From: nocturnal <nocturnal@xxxxxxxxxx>
- Date: Wed, 21 Feb 2007 22:03:40 +0100
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.
Med vänliga hälsningar
Stefan Midjich aka nocturnal
[Swehack] http://swehack.se
Pietro Cerutti wrote:
On 2/20/07, nocturnal <nocturnal@xxxxxxxxxx> 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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