iOS 获取 Mac 地址

释放双眼,带上耳机,听听看~!
#import <sys/sysctl.h>
#import <sys/ioctl.h>
#import <net/if.h>
#import <net/if_dl.h>

+ (NSString *)macAddress {
    int                 mib[6];
    size_t              len;
    char                *buf;
    unsigned char       *ptr;
    struct if_msghdr    *ifm;
    struct sockaddr_dl  *sdl;

    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;

    if((mib[5] = if_nametoindex("en0")) == 0) {
        printf("Error: if_nametoindex errorn");
        return NULL;
    }

    if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 1n");
        return NULL;
    }

    if((buf = malloc(len)) == NULL) {
        printf("Could not allocate memory. Rrror!n");
        return NULL;
    }

    if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 2");
        return NULL;
    }

    ifm = (struct if_msghdr *)buf;
    sdl = (struct sockaddr_dl *)(ifm + 1);
    ptr = (unsigned char *)LLADDR(sdl);
    NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x",
                           *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
    free(buf);

    return outstring;
}

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