getting ethernet physical address

[Martin Bammer]

On Wednesday 19 December 2001 15:49, you wrote:
> hi there,
>
>     i would like to write a simple program to get the physical address of
> my network card. can anybody let me know how to achieve that? which class
> or function should i call? thanks in advance.
>
>         YK (Loh Yong Khun)
>         <ykloh at lkta.com.my>
Hi!

Thats not as easy as getting it from proc or with ifconfig.
Principally you have to talk directly to the ethernet driver.
First you have to get access to the driver by an open command.
Then you have to call the right ioctl-function. Here are some source lines 
from ifconfig:

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
        memset(ife->hwaddr, 0, 32);
    else
        memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);

For more information get the source for ifconfig. For a debian user its easy:

apt-get source net-tools

Otherwise look with the oracle: www.google.com/linux

Greetings, Martin

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