Thank you very much, Floyd.
I have tried your code. But if i change the mac address via ifconfig I
get the running mac address and not the real mac address of the
network card.
Anyone know how get the real mac address of the network card ?
Thanks again, Floyd.
Floyd Davidson <floyd@barrow.com> wrote in message news:<87lltdwhdf.fld@barrow.com>...
> cragazzon@tiscali.it (cris) wrote:
> >I want get the permanent mac address of a network card,
> >programmatically, in C language, for example with a ioctl o similar.
> >
> >But the mac address is updateable via software with ifconfig or other
> >commands. In this case I want get the real mac address set in the
> >eprom of a network card by the factory, not the modified mac address.
> >
> >Is this possible ?
> >If it is possible, have you a sample code for get this information in
> >c lang ?
> >
> >Thanks in advance.
>
> I don't know if you can get at the hardwired MAC address or not.
> The following program demonstrates how to get the address that the
> interface is actually using.
>
> #define _BSD_SOURCE
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> #include <sys/ioctl.h>
> #include <sys/socket.h>
> #include <sys/types.h>
> #include <net/if.h>
> #include <arpa/inet.h>
>
> int main(void)
> {
> int sfd;
> unsigned char *u;
> struct ifreq ifr;
> struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
>
> memset(&ifr, 0, sizeof ifr);
>
> if (0 > (sfd = socket(AF_INET, SOCK_STREAM, 0))) {
> perror("socket()");
> exit(EXIT_FAILURE);
> }
>
> strcpy(ifr.ifr_name, "eth0");
> sin->sin_family = AF_INET;
>
> if (0 == ioctl(sfd, SIOCGIFADDR, &ifr)) {
> printf("%s: %s\n", ifr.ifr_name, inet_ntoa(sin->sin_addr));
> }
>
> if (0 > ioctl(sfd, SIOCGIFHWADDR, &ifr)) {
> return EXIT_FAILURE;
> }
>
> u = (unsigned char *) &ifr.ifr_addr.sa_data;
>
> if (u[0] + u[1] + u[2] + u[3] + u[4] + u[5]) {
> printf("HW Address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
> u[0], u[1], u[2], u[3], u[4], u[5]);
> }
>
> return EXIT_SUCCESS;
> }