find MAC ADDRESS program C

ofada · 01-15-2004, 06:04 AM

I want to find my MAC ADDRESS in C language.
There is the 'detect' library but it doesnt detect hardware address.
Thank you for your help
bye

kev82 · 01-15-2004, 08:13 AM

ok, ive done a little detective work on ifconfig and from what i can see you want to use the SIOCGIFHWADDR ioctl on an open network socket, it takes a pointer to a struct ifreq which is defined in include/linux/if.h it might be worth looking at the source to ifconfig because this is just an estimated guess from the output of strace and some greps.

post back if you need an example program and i'll try to write one.

<edit>

what was wrong with the post from Hiper in Linux Hardware? http://www.linuxquestions.org/questi...hreadid=135016

please dont double post, if you feel the answer wasnt good enough then post back or if you want your thread moved click the report to moderator link and ask them to move to another forum

</edit>

ofada · 01-15-2004, 01:40 PM

If you can post me an example (i dont care if it doenst work properly) it will be cool.
Thanks!

kev82 · 01-15-2004, 01:50 PM

Code:

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <stdio.h>
#include <linux/if.h>

int main()
{
	int sd,i;
	struct ifreq ir;

	sd=socket(PF_INET, SOCK_STREAM, 0);
	memset(&ir, 0, sizeof(ir));

	strcpy(ir.ifr_name, "eth0");
	ioctl(sd, SIOCGIFHWADDR, &ir);

	close(sd);

	for(i=0;i<6;i++) {
		printf("%.2hhx:", ir.ifr_hwaddr.sa_data[i]);
	}

	return 0;
}

<edit>
there is another ioctl you could use to get the ip of the interface but i'll leave that to you
</edit>

ofada · 01-15-2004, 02:27 PM

thank you I will try this.
Bye