iPhone Get MAC Address without network connection

gistfile1.txt

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <net/if_dl.h>
#include <ifaddrs.h>

#define IFT_ETHER 0x6 

- (NSString *) macaddress{
    
    int  success;
    struct ifaddrs * addrs;
    struct ifaddrs * cursor;
    const struct sockaddr_dl * dlAddr;
    const unsigned char* base;
    int i;
    
    char* macAddress= (char*)calloc(18, sizeof(char));
    char ifName[] = "en0";
    
    success = getifaddrs(&addrs) == 0;
    if (success) {
        cursor = addrs;
        while (cursor != 0) {
            if ( (cursor->ifa_addr->sa_family == AF_LINK)
                && (((const struct sockaddr_dl *) cursor->ifa_addr)->sdl_type == IFT_ETHER)
                && strcmp(ifName,  cursor->ifa_name) == 0 ) {
                
                dlAddr = (const struct sockaddr_dl *) cursor->ifa_addr;
                base = (const unsigned char*) &dlAddr->sdl_data[dlAddr->sdl_nlen];
                strcpy(macAddress, "");
                for (i = 0; i < dlAddr->sdl_alen; i++) {
                    if (i != 0) {
                        strcat(macAddress, ":");
                    }
                    char partialAddr[3];
                    sprintf(partialAddr, "%02X", base[i]);
                    strcat(macAddress, partialAddr);
                    
                }
            }
            cursor = cursor->ifa_next;
        }
        
        freeifaddrs(addrs);
    }
    
    NSString* mac= [[[NSString alloc] initWithCString:macAddress
                                             encoding:NSMacOSRomanStringEncoding] autorelease];
    free(macAddress);
    return mac;
}

not works for iOS7

iOS 7 no longer allows you to access the Mac Address on the device. The only solution is to use the advertising identifier.