获取mac地址, 系统唯一标示

DeviceIdentifier.h

#import <Foundation/Foundation.h>


@interface DeviceIdentifier : NSObject

/**
 *	@brief	use this method when you need a unique identifier in one app.
 *          It generates a hash from the MAC-address in combination with the bundle identifier of your app.
 *
 *	@return	return a unique identifier
 */
- (NSString *)uniqueDeviceIdentifier;


/**
 *	@brief	use this method when you need a unique global identifier to track a device
 *          with multiple apps. as example a advertising network will use this method to track the device
 *          from different apps.
 *
 *	@return	return a unique global identifier
 */
- (NSString *)uniqueGlobalDeviceIdentifier;

@end

DeviceIdentifier.m

#import "DeviceIdentifier.h"
#import "MD5.h"

#include <sys/socket.h> // Per msqr
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>


@implementation DeviceIdentifier

////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Private Methods

// Return the local MAC addy
// Courtesy of FreeBSD hackers email list
// Accidentally munged during previous update. Fixed thanks to erica sadun & mlamb.
- (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 error\n");
        return NULL;
    }

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

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

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

////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Public Methods

- (NSString *)uniqueDeviceIdentifier
{
    NSString *macaddress = [self macaddress];
    NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];

    NSString *stringToHash = [NSString stringWithFormat:@"%@%@",macaddress,bundleIdentifier];
    NSString *uniqueIdentifier = [MD5 MD5String:stringToHash];

    return uniqueIdentifier;
}

- (NSString *)uniqueGlobalDeviceIdentifier
{
    NSString *macaddress = [self macaddress];
    NSString *uniqueIdentifier = [MD5 MD5String:macaddress];

    return uniqueIdentifier;
}

@end