SvUDID实现设备唯一标示

//SvUDIDTools : https://github.com/smileEvday/SvUDID

//将生成的UDID保存到钥匙串中,用户卸载app再重新安装UDID也不会改变.

/* 用法1:(摘于网上的使用方法)
在工程目录下新建一个KeychainAccessGroups.plist文件，该文件的结构中最顶层的节点必须是一个名为“keychain-access-groups”的Array，
并且该Array中每一项都是一个描述分组的NSString。yourAppID.com.yourCompany.whatever就是你要起的公共区名称，除了whatever字段可以随便定之外，
其 他的都必须如实填写。这个文件的路径要配置 在 Project->build setting->Code Signing Entitlements里，否则公共区无效，配置好后， 须用你正式的证书签名编译才可通过，
否则xcode会弹框告诉你code signing有问题。所以，苹果限制了你只能同公司的产品共享 KeyChain数据，别的公司访问不了你公司产品的KeyChain。
如果拷贝：则将UID文件夹下面的KeychainAccessGroups.plist拷贝到同级于工程目录,并拖曳到xcode工程窗口修改响应的yourAppID.com.yourCompany.whatever

追加Build Phases->Compile Sources下面的SvUDIDTools.m文件配置信息字符串“-fno-objc-arc”

修改Build Setting－>Code Signing－>Code Signing Entitlements属性为KeychainAccessGroups.plist

*/

/*用法2:自己实际操作
Project -> Capabilities -> Keychain Sharing -> on, 会弹出提示框请求Fetching list of teams from the Developer Portal....,选择开发账号,确认. 生成entitlements文件, 网络不好时,可手动添加 KeychainAccessGroups.plist 用法类似 用法1.
    自动生成的entitlements 已经将Keychain Access Groups 补充好, 不需再更改,Keychain Access Groups分组中会出现 $(AppIdentifierPrefix)com.moule.Utils-iOS ( $(AppIdentifierPrefix)开头的字段 ), 

    Build Phases->Compile Sources下面的SvUDIDTools.m文件配置信息字符串“-fno-objc-arc”

//获取开发账号的appID
+ (NSString *)bundleSeedID {
    NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:kSecClassGenericPassword, kSecClass,@"bundleSeedID", kSecAttrAccount,@"", kSecAttrService,(id)kCFBooleanTrue, kSecReturnAttributes,nil];
    CFDictionaryRef result = nil;
    OSStatus status = SecItemCopyMatching((CFDictionaryRef)query, (CFTypeRef *)&result);
    if (status == errSecItemNotFound)
        status = SecItemAdd((CFDictionaryRef)query, (CFTypeRef *)&result);
            if (status != errSecSuccess)
                return nil;
        NSString *accessGroup = [(__bridge NSDictionary *)result objectForKey:kSecAttrAccessGroup];
        NSArray *components = [accessGroup componentsSeparatedByString:@"."];
        NSString *bundleSeedID = [[components objectEnumerator] nextObject];
        CFRelease(result);
    return bundleSeedID;
}

kKeyChainUDIDAccessGroup 是应用的bundle ID

*/

.h文件

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface SvUDIDTools : NSObject

/*
 * @brief obtain Unique Device Identity
 */
+ (NSString*)UDID;

@end

.m文件

//
//  SvUDIDTools.m
//  SvUDID
//
//  Created by  maple on 8/18/13.
//  Copyright (c) 2013 maple. All rights reserved.
//

#import "SvUDIDTools.h"
#import <Security/Security.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>

// replace the identity with your company's domain
static const char kKeychainUDIDItemIdentifier[]  = "UUID";
static NSString * kKeyChainUDIDAccessGroup = @"com.moule.Utils-iOS";

@implementation SvUDIDTools

+ (NSString *)bundleSeedID {
    NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                           kSecClassGenericPassword, kSecClass,
                           @"bundleSeedID", kSecAttrAccount,
                           @"", kSecAttrService,
                           (id)kCFBooleanTrue, kSecReturnAttributes,
                           nil];
    CFDictionaryRef result = nil;
    OSStatus status = SecItemCopyMatching((CFDictionaryRef)query, (CFTypeRef *)&result);
    if (status == errSecItemNotFound)
        status = SecItemAdd((CFDictionaryRef)query, (CFTypeRef *)&result);
    if (status != errSecSuccess)
        return nil;
    NSString *accessGroup = [(__bridge NSDictionary *)result objectForKey:kSecAttrAccessGroup];
    NSArray *components = [accessGroup componentsSeparatedByString:@"."];
    NSString *bundleSeedID = [[components objectEnumerator] nextObject];
    CFRelease(result);
    return bundleSeedID;
}

+ (NSString*)UDID
{
    NSString *udid = [SvUDIDTools getUDIDFromKeyChain];
    if (!udid) {

        NSString *sysVersion = [UIDevice currentDevice].systemVersion;
        CGFloat version = [sysVersion floatValue];

        if (version >= 7.0) {
            udid = [SvUDIDTools _UDID_iOS7];
        }
        else if (version >= 2.0) {
            udid = [SvUDIDTools _UDID_iOS6];
        }

        [SvUDIDTools settUDIDToKeyChain:udid];
    }

    return udid;
}

/*
 * iOS 6.0
 * use wifi's mac address
 */
+ (NSString*)_UDID_iOS6
{
    return [SvUDIDTools getMacAddress];
}

/*
 * iOS 7.0
 * Starting from iOS 7, the system always returns the value 02:00:00:00:00:00
 * when you ask for the MAC address on any device.
 * use identifierForVendor + keyChain
 * make sure UDID consistency atfer app delete and reinstall
 */
+ (NSString*)_UDID_iOS7
{
    return [[UIDevice currentDevice].identifierForVendor UUIDString];
}

#pragma mark -
#pragma mark Helper Method for Get Mac Address

// from http://stackoverflow.com/questions/677530/how-can-i-programmatically-get-the-mac-address-of-an-iphone
+ (NSString *)getMacAddress
{
    int                 mgmtInfoBase[6];
    char                *msgBuffer = NULL;
    size_t              length;
    unsigned char       macAddress[6];
    struct if_msghdr    *interfaceMsgStruct;
    struct sockaddr_dl  *socketStruct;
    NSString            *errorFlag = nil;

    // Setup the management Information Base (mib)
    mgmtInfoBase[0] = CTL_NET;        // Request network subsystem
    mgmtInfoBase[1] = AF_ROUTE;       // Routing table info
    mgmtInfoBase[2] = 0;
    mgmtInfoBase[3] = AF_LINK;        // Request link layer information
    mgmtInfoBase[4] = NET_RT_IFLIST;  // Request all configured interfaces

    // With all configured interfaces requested, get handle index
    if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0)
        errorFlag = @"if_nametoindex failure";
    else
    {
        // Get the size of the data available (store in len)
        if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0)
            errorFlag = @"sysctl mgmtInfoBase failure";
        else
        {
            // Alloc memory based on above call
            if ((msgBuffer = malloc(length)) == NULL)
                errorFlag = @"buffer allocation failure";
            else
            {
                // Get system information, store in buffer
                if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0)
                    errorFlag = @"sysctl msgBuffer failure";
            }
        }
    }

    // Befor going any further...
    if (errorFlag != NULL)
    {
        NSLog(@"Error: %@", errorFlag);
        if (msgBuffer) {
            free(msgBuffer);
        }

        return errorFlag;
    }

    // Map msgbuffer to interface message structure
    interfaceMsgStruct = (struct if_msghdr *) msgBuffer;

    // Map to link-level socket structure
    socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1);

    // Copy link layer address data in socket structure to an array
    memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6);

    // Read from char array into a string object, into traditional Mac address format
    NSString *macAddressString = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
                                  macAddress[0], macAddress[1], macAddress[2],
                                  macAddress[3], macAddress[4], macAddress[5]];
    NSLog(@"Mac Address: %@", macAddressString);

    // Release the buffer memory
    free(msgBuffer);

    return macAddressString;
}

#pragma mark -
#pragma mark Helper Method for make identityForVendor consistency

+ (NSString*)getUDIDFromKeyChain
{
    NSMutableDictionary *dictForQuery = [[NSMutableDictionary alloc] init];
    [dictForQuery setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];

    // set Attr Description for query
    [dictForQuery setValue:[NSString stringWithUTF8String:kKeychainUDIDItemIdentifier]
                    forKey:kSecAttrDescription];

    // set Attr Identity for query
    NSData *keychainItemID = [NSData dataWithBytes:kKeychainUDIDItemIdentifier
                                            length:strlen(kKeychainUDIDItemIdentifier)];
    [dictForQuery setObject:keychainItemID forKey:(id)kSecAttrGeneric];

    // The keychain access group attribute determines if this item can be shared
    // amongst multiple apps whose code signing entitlements contain the same keychain access group.
    NSString *accessGroup =[NSString stringWithFormat:@"%@.%@",[SvUDIDTools bundleSeedID],kKeyChainUDIDAccessGroup];
    if (accessGroup != nil)
    {
#if TARGET_IPHONE_SIMULATOR
        // Ignore the access group if running on the iPhone simulator.
        //
        // Apps that are built for the simulator aren't signed, so there's no keychain access group
        // for the simulator to check. This means that all apps can see all keychain items when run
        // on the simulator.
        //
        // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
        // simulator will return -25243 (errSecNoAccessForItem).
#else
        [dictForQuery setObject:accessGroup forKey:(id)kSecAttrAccessGroup];
#endif
    }

    [dictForQuery setValue:(id)kCFBooleanTrue forKey:(id)kSecMatchCaseInsensitive];
    [dictForQuery setValue:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    [dictForQuery setValue:(id)kCFBooleanTrue forKey:(id)kSecReturnData];

    OSStatus queryErr   = noErr;
    NSData   *udidValue = nil;
    NSString *udid      = nil;
    queryErr = SecItemCopyMatching((CFDictionaryRef)dictForQuery, (CFTypeRef*)&udidValue);

    NSMutableDictionary *dict = nil;
    [dictForQuery setValue:(id)kCFBooleanTrue forKey:(id)kSecReturnAttributes];
    queryErr = SecItemCopyMatching((CFDictionaryRef)dictForQuery, (CFTypeRef*)&dict);

    if (queryErr == errSecItemNotFound) {
        NSLog(@"KeyChain Item: %@ not found!!!", [NSString stringWithUTF8String:kKeychainUDIDItemIdentifier]);
    }
    else if (queryErr != errSecSuccess) {
        NSLog(@"KeyChain Item query Error!!! Error code:%d", (int)queryErr);
    }
    if (queryErr == errSecSuccess) {
        NSLog(@"KeyChain Item: %@", udidValue);

        if (udidValue) {
            udid = [NSString stringWithUTF8String:udidValue.bytes];
            [udidValue release];
        }
        [dict release];
    }

    [dictForQuery release];
    return udid;
}

+ (BOOL)settUDIDToKeyChain:(NSString*)udid
{
    NSMutableDictionary *dictForAdd = [[NSMutableDictionary alloc] init];

    [dictForAdd setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];
    [dictForAdd setValue:[NSString stringWithUTF8String:kKeychainUDIDItemIdentifier] forKey:kSecAttrDescription];

    [dictForAdd setValue:@"UUID" forKey:(id)kSecAttrGeneric];

    // Default attributes for keychain item.
    [dictForAdd setObject:@"" forKey:(id)kSecAttrAccount];
    [dictForAdd setObject:@"" forKey:(id)kSecAttrLabel];

    // The keychain access group attribute determines if this item can be shared
    // amongst multiple apps whose code signing entitlements contain the same keychain access group.
    NSString *accessGroup = [NSString stringWithFormat:@"%@.%@",[SvUDIDTools bundleSeedID],kKeyChainUDIDAccessGroup];
    if (accessGroup != nil)
    {
#if TARGET_IPHONE_SIMULATOR
        // Ignore the access group if running on the iPhone simulator.
        //
        // Apps that are built for the simulator aren't signed, so there's no keychain access group
        // for the simulator to check. This means that all apps can see all keychain items when run
        // on the simulator.
        //
        // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
        // simulator will return -25243 (errSecNoAccessForItem).
#else
        [dictForAdd setObject:accessGroup forKey:(id)kSecAttrAccessGroup];
#endif
    }

    const char *udidStr = [udid UTF8String];
    NSData *keyChainItemValue = [NSData dataWithBytes:udidStr length:strlen(udidStr)];
    [dictForAdd setValue:keyChainItemValue forKey:(id)kSecValueData];

    OSStatus writeErr = noErr;
    if ([SvUDIDTools getUDIDFromKeyChain]) {        // there is item in keychain
        [SvUDIDTools updateUDIDInKeyChain:udid];
        [dictForAdd release];
        return YES;
    }
    else {          // add item to keychain
        writeErr = SecItemAdd((CFDictionaryRef)dictForAdd, NULL);
        if (writeErr != errSecSuccess) {
            NSLog(@"Add KeyChain Item Error!!! Error Code:%ld", writeErr);

            [dictForAdd release];
            return NO;
        }
        else {
            NSLog(@"Add KeyChain Item Success!!!");
            [dictForAdd release];
            return YES;
        }
    }

    [dictForAdd release];
    return NO;
}

+ (BOOL)removeUDIDFromKeyChain
{
    NSMutableDictionary *dictToDelete = [[NSMutableDictionary alloc] init];

    [dictToDelete setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];

    NSData *keyChainItemID = [NSData dataWithBytes:kKeychainUDIDItemIdentifier length:strlen(kKeychainUDIDItemIdentifier)];
    [dictToDelete setValue:keyChainItemID forKey:(id)kSecAttrGeneric];

    OSStatus deleteErr = noErr;
    deleteErr = SecItemDelete((CFDictionaryRef)dictToDelete);
    if (deleteErr != errSecSuccess) {
        NSLog(@"delete UUID from KeyChain Error!!! Error code:%ld", deleteErr);
        [dictToDelete release];
        return NO;
    }
    else {
        NSLog(@"delete success!!!");
    }

    [dictToDelete release];
    return YES;
}

+ (BOOL)updateUDIDInKeyChain:(NSString*)newUDID
{

    NSMutableDictionary *dictForQuery = [[NSMutableDictionary alloc] init];

    [dictForQuery setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];

    NSData *keychainItemID = [NSData dataWithBytes:kKeychainUDIDItemIdentifier
                                            length:strlen(kKeychainUDIDItemIdentifier)];
    [dictForQuery setValue:keychainItemID forKey:(id)kSecAttrGeneric];
    [dictForQuery setValue:(id)kCFBooleanTrue forKey:(id)kSecMatchCaseInsensitive];
    [dictForQuery setValue:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    [dictForQuery setValue:(id)kCFBooleanTrue forKey:(id)kSecReturnAttributes];

    NSDictionary *queryResult = nil;
    SecItemCopyMatching((CFDictionaryRef)dictForQuery, (CFTypeRef*)&queryResult);
    if (queryResult) {

        NSMutableDictionary *dictForUpdate = [[NSMutableDictionary alloc] init];
        [dictForUpdate setValue:[NSString stringWithUTF8String:kKeychainUDIDItemIdentifier] forKey:kSecAttrDescription];
        [dictForUpdate setValue:keychainItemID forKey:(id)kSecAttrGeneric];

        const char *udidStr = [newUDID UTF8String];
        NSData *keyChainItemValue = [NSData dataWithBytes:udidStr length:strlen(udidStr)];
        [dictForUpdate setValue:keyChainItemValue forKey:(id)kSecValueData];

        OSStatus updateErr = noErr;

        // First we need the attributes from the Keychain.
        NSMutableDictionary *updateItem = [NSMutableDictionary dictionaryWithDictionary:queryResult];
        [queryResult release];

        // Second we need to add the appropriate search key/values.
        // set kSecClass is Very important
        [updateItem setObject:(id)kSecClassGenericPassword forKey:(id)kSecClass];

        updateErr = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)dictForUpdate);
        if (updateErr != errSecSuccess) {
            NSLog(@"Update KeyChain Item Error!!! Error Code:%ld", updateErr);

            [dictForQuery release];
            [dictForUpdate release];
            return NO;
        }
        else {
            NSLog(@"Update KeyChain Item Success!!!");
            [dictForQuery release];
            [dictForUpdate release];
            return YES;
        }
    }

    [dictForQuery release];
    return NO;
}

@end