Get MAC addresses of all interfaces

gistfile1.m

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <errno.h>
#include <net/if_dl.h>

#if ! defined(IFT_ETHER)
#define IFT_ETHER 0x6/* Ethernet CSMACD */
#endif


@implementation UIDevice (Extensions)

- (NSDictionary *)interfaces
    {
    NSMutableDictionary *theDictionary = [NSMutableDictionary dictionary];


    BOOL success;
    struct ifaddrs * addrs;
    const struct ifaddrs * cursor;
    const struct sockaddr_dl * dlAddr;
    const uint8_t * base;

    success = getifaddrs(&addrs) == 0;
    if (success)
        {
        cursor = addrs;
        while (cursor != NULL)
            {
            if ( (cursor->ifa_addr->sa_family == AF_LINK) && (((const struct sockaddr_dl *)cursor->ifa_addr)->sdl_type == IFT_ETHER) )
                {
                fprintf(stderr, "%s:", cursor->ifa_name);
                dlAddr = (const struct sockaddr_dl *)cursor->ifa_addr;
                base = (const uint8_t *) &dlAddr->sdl_data[dlAddr->sdl_nlen];

                NSString *theKey = [NSString stringWithUTF8String:cursor->ifa_name];
                NSString *theValue = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", base[0], base[1], base[2], base[3], base[4], base[5]];
                [theDictionary setObject:theValue forKey:theKey];
                }
                
            cursor = cursor->ifa_next;
            }

        freeifaddrs(addrs);
        }

    return(theDictionary);
    
    }

@end