nexmon – Rev 1

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/*
 *      macaddr
 *
 *      Program to return the MAC address of an Ethernet
 *      adapter.  This was written to help configure the
 *      adapter based on the MAC address rather than the
 *      name.
 *
 *      Version 1.0     Eric Dittman    2001-10-19
 *
 *      This is released unther the GPL license.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "iwlib.h"

int main(int argc, char** argv)
{

        int devsock;
        struct ifreq ifbuffer;
        char buf[20];

        if ((argc != 2) || (argv[1][0] == '-')) {
                printf("Usage: macaddr interface\n");
                exit(1);
        }

        devsock = socket(AF_INET, SOCK_STREAM, 0);

        if (devsock == -1) {
                perror("Failed opening socket");
                exit (1);
        }

        memset(&ifbuffer, 0, sizeof(ifbuffer));
        strncpy(ifbuffer.ifr_name, argv[1], sizeof(ifbuffer.ifr_name));
        if (ioctl(devsock, SIOCGIFHWADDR, &ifbuffer) == -1) {
                fprintf(stderr, "There is no MACADDR for %s\n", argv[1]);
                exit(1);
        }
        close(devsock);

        puts(iw_saether_ntop(&ifbuffer.ifr_ifru.ifru_hwaddr, buf));

        exit(0);
}