├── Example └── NHNetworkTimeExample │ ├── Podfile │ ├── NHNetworkTimeExample.xcodeproj │ ├── project.xcworkspace │ │ ├── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ └── IDEWorkspaceChecks.plist │ └── project.pbxproj │ ├── NHNetworkTimeExample.xcworkspace │ ├── xcshareddata │ │ └── IDEWorkspaceChecks.plist │ └── contents.xcworkspacedata │ ├── NHNetworkTimeExample │ ├── ViewController.h │ ├── AppDelegate.h │ ├── main.m │ ├── Assets.xcassets │ │ └── AppIcon.appiconset │ │ │ └── Contents.json │ ├── Info.plist │ ├── Base.lproj │ │ ├── LaunchScreen.storyboard │ │ └── Main.storyboard │ ├── AppDelegate.m │ └── ViewController.m │ └── Podfile.lock ├── NHNetworkTime ├── NHNetworkTime.h ├── NHNTLog.h ├── NSDate+NetworkClock.m ├── NSDate+NetworkClock.h ├── NHNetworkClock.h ├── NHNetAssociation.h ├── NHNetworkClock.m └── NHNetAssociation.m ├── .gitignore ├── NHNetworkTime.podspec ├── README.md └── LICENSE /Example/NHNetworkTimeExample/Podfile: -------------------------------------------------------------------------------- 1 | target 'NHNetworkTimeExample' do 2 | pod 'NHNetworkTime', :path => '../../' 3 | end -------------------------------------------------------------------------------- /NHNetworkTime/NHNetworkTime.h: -------------------------------------------------------------------------------- 1 | /* 2 | NetworkClock.h 3 | Created by Gavin Eadie on Oct17/10 4 | Edited by Nguyen Cong Huy 5 | */ 6 | #import "NHNTLog.h" 7 | #import "NHNetAssociation.h" 8 | #import "NHNetworkClock.h" 9 | #import "NSDate+NetworkClock.h" 10 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 9 | 10 | 11 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // NHNetworkTimeExample 4 | // 5 | // Created by Nguyen Cong Huy on 9/20/15. 6 | // Copyright © 2015 Nguyen Cong Huy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | 14 | @end 15 | 16 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // NHNetworkTimeExample 4 | // 5 | // Created by Nguyen Cong Huy on 9/20/15. 6 | // Copyright © 2015 Nguyen Cong Huy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface AppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | 16 | @end 17 | 18 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // NHNetworkTimeExample 4 | // 5 | // Created by Nguyen Cong Huy on 9/20/15. 6 | // Copyright © 2015 Nguyen Cong Huy. All rights reserved. 7 | // 8 | 9 | #import 10 | #import "AppDelegate.h" 11 | 12 | int main(int argc, char * argv[]) { 13 | @autoreleasepool { 14 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /NHNetworkTime/NHNTLog.h: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | 4 | #define NTP_Logging(fmt, ...) 5 | #define LogInProduction(fmt, ...) \ 6 | NSLog((@"%@|" fmt), [NSString stringWithFormat: @"%16s", \ 7 | [[[self class] description] UTF8String]], ##__VA_ARGS__) 8 | 9 | #ifdef IOS_NTP_LOGGING 10 | #undef NTP_Logging 11 | #define NTP_Logging(fmt, ...) \ 12 | NSLog((@"%@|" fmt), [NSString stringWithFormat: @"%16s", \ 13 | [[[self class] description] UTF8String]], ##__VA_ARGS__) 14 | #endif 15 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/Podfile.lock: -------------------------------------------------------------------------------- 1 | PODS: 2 | - CocoaAsyncSocket (7.5.0): 3 | - CocoaAsyncSocket/GCD (= 7.5.0) 4 | - CocoaAsyncSocket/GCD (7.5.0) 5 | - NHNetworkTime (1.7): 6 | - CocoaAsyncSocket (~> 7.5.0) 7 | 8 | DEPENDENCIES: 9 | - NHNetworkTime (from `../../`) 10 | 11 | EXTERNAL SOURCES: 12 | NHNetworkTime: 13 | :path: ../../ 14 | 15 | SPEC CHECKSUMS: 16 | CocoaAsyncSocket: 3baeb1ddd969f81cf9fca81053ae49ef2d1cbbfa 17 | NHNetworkTime: b140ee21770aed41e7b8fd43647bce6349ad10f2 18 | 19 | PODFILE CHECKSUM: 18bb4b225dff96cdf16db3cea747adc903a9705d 20 | 21 | COCOAPODS: 1.0.1 22 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | build/ 4 | *.pbxuser 5 | !default.pbxuser 6 | *.mode1v3 7 | !default.mode1v3 8 | *.mode2v3 9 | !default.mode2v3 10 | *.perspectivev3 11 | !default.perspectivev3 12 | xcuserdata 13 | *.xccheckout 14 | *.moved-aside 15 | DerivedData 16 | *.hmap 17 | *.ipa 18 | *.xcuserstate 19 | 20 | # CocoaPods 21 | # 22 | # We recommend against adding the Pods directory to your .gitignore. However 23 | # you should judge for yourself, the pros and cons are mentioned at: 24 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control 25 | # 26 | #Pods/ 27 | Example/NHNetworkTimeExample/Pods 28 | -------------------------------------------------------------------------------- /NHNetworkTime.podspec: -------------------------------------------------------------------------------- 1 | Pod::Spec.new do |s| 2 | s.name = 'NHNetworkTime' 3 | s.version = '1.7.1' 4 | s.summary = 'Simple Network Time Protocol SNTP for iOS.' 5 | s.homepage = 'https://github.com/huynguyencong/NHNetworkTime' 6 | s.license = { :type => 'Apache', :file => 'LICENSE' } 7 | s.source = { :git => 'https://github.com/huynguyencong/NHNetworkTime.git', :tag => "#{s.version}" } 8 | s.author = { 'Huy Nguyen Cong' => 'https://github.com/huynguyencong' } 9 | s.ios.deployment_target = '7.0' 10 | s.source_files = 'NHNetworkTime/*.{h,m}' 11 | s.framework = 'CFNetwork' 12 | s.dependency 'CocoaAsyncSocket', '~>7.5.0' 13 | s.requires_arc = true 14 | end 15 | -------------------------------------------------------------------------------- /NHNetworkTime/NSDate+NetworkClock.m: -------------------------------------------------------------------------------- 1 | 2 | 3 | #import "NSDate+NetworkClock.h" 4 | 5 | @implementation NSDate (NetworkClock) 6 | 7 | - (NSTimeInterval) timeIntervalSinceNetworkDate { 8 | return [self timeIntervalSinceDate:[NSDate networkDate]]; 9 | } 10 | 11 | + (NSTimeInterval) timeIntervalSinceNetworkDate { 12 | return [[self date] timeIntervalSinceNetworkDate]; 13 | } 14 | 15 | 16 | + (NSDate *) networkDate { 17 | return [[NHNetworkClock sharedNetworkClock] networkTime]; 18 | } 19 | 20 | + (NSDate *) threadsafeNetworkDate { 21 | NHNetworkClock *sharedClock = [NHNetworkClock sharedNetworkClock]; 22 | @synchronized(sharedClock) { 23 | return [sharedClock networkTime]; 24 | } 25 | } 26 | 27 | 28 | @end -------------------------------------------------------------------------------- /NHNetworkTime/NSDate+NetworkClock.h: -------------------------------------------------------------------------------- 1 | 2 | // Author: Juan Batiz-Benet 3 | 4 | // Category on NSDate to provide convenience access to NetworkClock. 5 | // To use, simply call [NSDate networkDate]; 6 | 7 | #import 8 | #import "NHNetworkClock.h" 9 | 10 | 11 | @interface NSDate (NetworkClock) 12 | 13 | @property (NS_NONATOMIC_IOSONLY, readonly) NSTimeInterval timeIntervalSinceNetworkDate; 14 | 15 | + (NSTimeInterval)timeIntervalSinceNetworkDate; 16 | 17 | + (NSDate *)networkDate; 18 | 19 | // the threadsafe version guards against reading a double that could be 20 | // potentially being updated at the same time. Since doubles are 8 words, 21 | // and arm is 32bit, this is not atomic and could provide bad values. 22 | 23 | + (NSDate *)threadsafeNetworkDate; 24 | 25 | @end -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "size" : "29x29", 6 | "scale" : "2x" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "size" : "29x29", 11 | "scale" : "3x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "40x40", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "size" : "40x40", 21 | "scale" : "3x" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "size" : "60x60", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "size" : "60x60", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "idiom" : "ipad", 35 | "size" : "29x29", 36 | "scale" : "1x" 37 | }, 38 | { 39 | "idiom" : "ipad", 40 | "size" : "29x29", 41 | "scale" : "2x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "40x40", 46 | "scale" : "1x" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "size" : "40x40", 51 | "scale" : "2x" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "size" : "76x76", 56 | "scale" : "1x" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "size" : "76x76", 61 | "scale" : "2x" 62 | }, 63 | { 64 | "idiom" : "ipad", 65 | "size" : "83.5x83.5", 66 | "scale" : "2x" 67 | } 68 | ], 69 | "info" : { 70 | "version" : 1, 71 | "author" : "xcode" 72 | } 73 | } -------------------------------------------------------------------------------- /NHNetworkTime/NHNetworkClock.h: -------------------------------------------------------------------------------- 1 | /** 2 | NHNetworkClock.h 3 | Created by Gavin Eadie on Oct17/10 ... Copyright 2010-14 Ramsay Consulting. All rights reserved. 4 | Modified by Nguyen Cong Huy on 9 Sep 2015 5 | */ 6 | 7 | #import "NHNetAssociation.h" 8 | 9 | #define kNHNetworkTimeSyncCompleteNotification @"kNHNetworkTimeSyncCompleteNotification" 10 | 11 | // The NetworkClock sends notifications of the network time. It will attempt to provide a very early estimate and then refine that and reduce the number of notifications ... 12 | // NetworkClock is a singleton class which will provide the best estimate of the difference in time between the device's system clock and the time returned by a collection of time servers. The method returns an NSDate with the network time. 13 | 14 | @interface NHNetworkClock : NSObject 15 | 16 | @property (nonatomic, readonly, copy) NSDate *networkTime; 17 | @property (nonatomic, readonly) NSTimeInterval networkOffset; 18 | @property (nonatomic, readonly) BOOL isSynchronized; 19 | 20 | #pragma mark - Options 21 | 22 | // every time network time is synchronized with server, it will be saved to disk. When call sync function (synchronize), if this property set to YES, it will use the previous saved time, before receive synchronized time from server. Default is YES 23 | @property (nonatomic) BOOL shouldUseSavedSynchronizedTime; 24 | 25 | // synchronize if user change local time 26 | @property (nonatomic) BOOL isAutoSynchronizedWhenUserChangeLocalTime; 27 | 28 | #pragma mark - 29 | 30 | + (instancetype) sharedNetworkClock; 31 | 32 | - (void)synchronize; 33 | 34 | @end -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | 47 | 48 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // NHNetworkTimeExample 4 | // 5 | // Created by Nguyen Cong Huy on 9/20/15. 6 | // Copyright © 2015 Nguyen Cong Huy. All rights reserved. 7 | // 8 | 9 | #import "AppDelegate.h" 10 | #import "NHNetworkTime.h" 11 | 12 | @interface AppDelegate () 13 | 14 | @end 15 | 16 | @implementation AppDelegate 17 | 18 | 19 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 20 | [[NHNetworkClock sharedNetworkClock] synchronize]; 21 | return YES; 22 | } 23 | 24 | - (void)applicationWillResignActive:(UIApplication *)application { 25 | // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. 26 | // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. 27 | } 28 | 29 | - (void)applicationDidEnterBackground:(UIApplication *)application { 30 | // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 31 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 32 | } 33 | 34 | - (void)applicationWillEnterForeground:(UIApplication *)application { 35 | // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background. 36 | } 37 | 38 | - (void)applicationDidBecomeActive:(UIApplication *)application { 39 | // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. 40 | } 41 | 42 | - (void)applicationWillTerminate:(UIApplication *)application { 43 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 44 | } 45 | 46 | @end 47 | -------------------------------------------------------------------------------- /NHNetworkTime/NHNetAssociation.h: -------------------------------------------------------------------------------- 1 | /** 2 | NHNetAssociation.h 3 | Created by Gavin Eadie on Nov03/10 ... Copyright 2010-14 Ramsay Consulting. All rights reserved. 4 | Modified by Nguyen Cong Huy on 9 Sep 2015 5 | 6 | This NetAssociation manages the communication and time calculations for one server. 7 | Multiple servers are used in a process in which each client/server pair (association) works to obtain its own best version of the time. The client sends small UDP packets to the server and the server overwrites certain fields in the packet and returns it immediately. As each packet is received, the offset between the client's network time and the system clock is derived with associated statistics delta, epsilon, and psi. 8 | Each association makes a best effort at obtaining an accurate time and makes it available as a property. Another process may use this to select, cluster, and combine the various servers' data to determine the most accurate and reliable candidates to provide an overall best time. 9 | */ 10 | 11 | #import 12 | #import 13 | 14 | 15 | 16 | #import 17 | 18 | @protocol NHNetAssociationDelegate; 19 | 20 | @interface NHNetAssociation : NSObject 21 | 22 | @property (readonly) NSString *server; // server name "123.45.67.89" 23 | @property (readonly) BOOL active; // is this clock running yet? 24 | @property (readonly) BOOL trusty; // is this clock trustworthy 25 | @property (readonly) double offset; // offset from device time (secs) 26 | @property (weak) id delegate; 27 | 28 | - (instancetype) initWithServerName:(NSString *) serverName; 29 | 30 | // This sets the association in a mode where it repeatedly gets time from its server and performs statical check and averages on these multiple values to provide a more accurate time. Starts the timer firing (sets the fire time randonly within the next five seconds) ... 31 | - (void)enable; 32 | 33 | //This stops the timer firing (sets the fire time to the infinite future) ... 34 | - (void)finish; 35 | 36 | // send one datagram to server .. 37 | - (void)sendTimeQuery; 38 | 39 | @end 40 | 41 | @protocol NHNetAssociationDelegate 42 | 43 | - (void)netAssociationDidFinishGetTime:(NHNetAssociation *)netAssociation; 44 | 45 | @end -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // NHNetworkTimeExample 4 | // 5 | // Created by Nguyen Cong Huy on 9/20/15. 6 | // Copyright © 2015 Nguyen Cong Huy. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | #import "NHNetworkTime.h" 11 | 12 | @interface ViewController () 13 | @property (weak, nonatomic) IBOutlet UILabel *currentLabel; 14 | @property (weak, nonatomic) IBOutlet UILabel *networkLabel; 15 | @property (weak, nonatomic) IBOutlet UILabel *syncedLabel; 16 | 17 | @property (nonatomic) NSTimer *oneSecondTimer; 18 | 19 | @end 20 | 21 | @implementation ViewController 22 | 23 | - (instancetype)init { 24 | if(self = [super init]) { 25 | 26 | } 27 | return self; 28 | } 29 | 30 | - (void)viewDidLoad { 31 | [super viewDidLoad]; 32 | [self updateDateToLabel]; 33 | [self observeTimeSyncNotification]; 34 | [self createUpdateUITimer]; 35 | } 36 | 37 | - (void)dealloc { 38 | [[NSNotificationCenter defaultCenter] removeObserver:self]; 39 | [self.oneSecondTimer invalidate]; 40 | } 41 | 42 | #pragma mark - Notification 43 | 44 | - (void)observeTimeSyncNotification { 45 | [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkTimeSyncCompleteNotification:) name:kNHNetworkTimeSyncCompleteNotification object:nil]; 46 | } 47 | 48 | - (void)networkTimeSyncCompleteNotification:(NSNotification *)notification { 49 | [self updateDateToLabel]; 50 | } 51 | 52 | #pragma mark - Update label timer 53 | 54 | - (void)createUpdateUITimer { 55 | self.oneSecondTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(oneSecondTimerTick) userInfo:nil repeats:YES]; 56 | } 57 | 58 | - (void)oneSecondTimerTick { 59 | [self updateDateToLabel]; 60 | } 61 | 62 | #pragma mark - UI 63 | 64 | - (void)updateDateToLabel { 65 | NSString *currentLabelText = [NSString stringWithFormat:@"%@", [[NSDate date] descriptionWithLocale:[NSLocale systemLocale]]]; 66 | NSString *networkLabelText = [NSString stringWithFormat:@"%@", [[NSDate networkDate] descriptionWithLocale:[NSLocale systemLocale]]]; 67 | 68 | self.currentLabel.text = currentLabelText; 69 | self.networkLabel.text = networkLabelText; 70 | 71 | if([NHNetworkClock sharedNetworkClock].isSynchronized) { 72 | self.syncedLabel.text = @"Time is SYNCHRONIZED"; 73 | self.syncedLabel.textColor = [UIColor blueColor]; 74 | } 75 | else { 76 | self.syncedLabel.text = @"Time is NOT synchronized"; 77 | self.syncedLabel.textColor = [UIColor redColor]; 78 | } 79 | } 80 | 81 | @end 82 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # NHNetworkTime 2 | A network time protocol (NTP) client. 3 | 4 | ### About 5 | 6 | The clock on the oldest iPhone, iTouch or iPad is not closely synchronized to the correct time. In the case of a device which is obtaining its time from the telephone system, there is a setting to enable synchronizing to the phone company time, but that time has been known to be over a minute different from the correct time. 7 | 8 | In addition, users may change their device time and severely affect applications that rely on correct times to enforce functionality, or may set their devices clock into the past in an attempt to dodge an expiry date. 9 | 10 | This project contains code to provide time obtained from standard time servers using the simple network time protocol (SNTP: RFC 5905). The implementation is not a rigorous as described in that document since the goal was to improve time accuracy to tens of milliSeconds, not to microseconds. 11 | 12 | Computers using the NTP protocol usually employ it in a continuous low level task to keep track of the time on a continuous basis. A background application uses occasional time estimates from a set of time servers to determine the best time by sampling these values over time. iOS applications are different, being more likely to want a one-time, quick estimate of the time. 13 | 14 | #### Compatible 15 | - iOS 7 and later. 16 | - Objective C, and Swift with bridge header (read below guide) 17 | 18 | ### Usage 19 | 20 | #### Cocoapod 21 | Add below line to Podfile: 22 | 23 | ``` 24 | pod NHNetworkTime 25 | ``` 26 | and then run below command in Terminal to install: 27 | `pod install` 28 | 29 | Note: If above pod isn't working, try using below pod defination in Podfile: 30 | `pod 'NHNetworkTime', :git => 'https://github.com/huynguyencong/NHNetworkTime.git'` 31 | #### Manual 32 | Add all file in folder NHNetworkTime to your project. Then add `CocoaAsyncSocket` use Cocoapod or add manual. 33 | 34 | #### Simple to use 35 | Import this whenever you want to get time: 36 | 37 | ``` 38 | #import "NHNetworkTime.h" 39 | ``` 40 | 41 | Call `synchronize` in `- application: didFinishLaunchingWithOptions:` to update time from server when you launch app: 42 | 43 | ``` 44 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 45 | [[NHNetworkClock sharedNetworkClock] synchronize]; 46 | return YES; 47 | } 48 | ``` 49 | 50 | then you can get network time when sync complete in anywhere in your source code: 51 | 52 | ``` 53 | NSDate *networkDate = [NSDate networkDate]; 54 | ``` 55 | 56 | or add notification to re-update your UI in anywhere you want when time is updated: 57 | 58 | ``` 59 | [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkTimeSyncCompleteNotification:) name:kNHNetworkTimeSyncCompleteNotification object:nil]; 60 | ``` 61 | 62 | #### Swift 63 | #####Use `use_frameworks!` 64 | 65 | If you have `use_frameworks!` option in Podfile, import `NHNetworkTime` framework in each code file use `NHNetworkTime` objects: 66 | 67 | ``` 68 | @import NHNetworkTime 69 | ``` 70 | 71 | 72 | ##### Not use `use_frameworks!` 73 | 74 | 75 | Import `NHNetworkTime.h` to your in bridge header file: 76 | 77 | ``` 78 | #import 79 | ``` 80 | * You can create bridge header file by create an Objective C file in project. Xcode will ask you to create bridge header file. After, you can delete the temporatory Objective C file have just added, and import `NHNetworkTime.h` into there (Read more: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html) 81 | 82 | ##### In your code 83 | Now, you can call below code in your code: 84 | 85 | ``` 86 | NHNetworkClock.sharedNetworkClock().synchronize() 87 | ``` 88 | and: 89 | 90 | ``` 91 | NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("syncCompleteNotification"), name: kNHNetworkTimeSyncCompleteNotification, object: nil) 92 | ``` 93 | #### More from NHNetworkClock 94 | - Use `NSNotifcationCenter` to add observer `kNHNetworkTimeSyncCompleteNotification` to receive notification when time sync complete 95 | - Property `isSynchronized`: Check network time synchronized or not 96 | - Property `shouldUseSavedSynchronizedTime`: Should use offset time saved in the last synchronization before sync from server. Default is YES. 97 | - Property `isAutoSynchronizedWhenUserChangeLocalTime`: Is auto sync when user change local time. Default is YES. 98 | 99 | #### Custom time server 100 | Add to project file name `ntp.hosts`, with content is time server address in every line. If file is not exist, it will use default time server. Example for `ntp.hosts` file: 101 | 102 | ``` 103 | asia.pool.ntp.org 104 | europe.pool.ntp.org 105 | north-america.pool.ntp.org 106 | ``` 107 | 108 | 109 | ### About this source 110 | NHNetworkTime is built from ios ntp open source from jbenet. NHNetworkTime fixed a critical bug get wrong time from origin source, and added more improvements: 111 | 112 | - Post notification when sync complete 113 | - Property make you know whether sync complete or not 114 | - Save offset time local to use immediately right after launch app, don't have to waiting for server 115 | - Auto sync when user change local time 116 | 117 | ### License 118 | NHNetworkTime is released under the Apache license. See LICENSE for details. Copyright © Nguyen Cong Huy 119 | -------------------------------------------------------------------------------- /NHNetworkTime/NHNetworkClock.m: -------------------------------------------------------------------------------- 1 | #import 2 | 3 | #import "NHNetworkClock.h" 4 | #import "NHNTLog.h" 5 | 6 | #define kTimeOffsetKey @"kTimeOffsetKey" 7 | 8 | @interface NHNetworkClock () 9 | 10 | @property NSMutableArray *timeAssociations; 11 | @property NSArray *sortDescriptors; 12 | @property NSSortDescriptor *dispersionSortDescriptor; 13 | @property dispatch_queue_t associationDelegateQueue; 14 | @property (readwrite) BOOL isSynchronized; 15 | 16 | @end 17 | 18 | @implementation NHNetworkClock 19 | 20 | + (instancetype)sharedNetworkClock { 21 | static id sharedNetworkClockInstance = nil; 22 | static dispatch_once_t onceToken; 23 | 24 | dispatch_once(&onceToken, ^{ 25 | sharedNetworkClockInstance = [[self alloc] init]; 26 | }); 27 | 28 | return sharedNetworkClockInstance; 29 | } 30 | 31 | - (instancetype)init { 32 | if (self = [super init]) { 33 | self.sortDescriptors = @[[[NSSortDescriptor alloc] initWithKey:@"dispersion" ascending:YES]]; 34 | self.timeAssociations = [NSMutableArray arrayWithCapacity:100]; 35 | self.shouldUseSavedSynchronizedTime = YES; 36 | self.isAutoSynchronizedWhenUserChangeLocalTime = YES; 37 | 38 | [[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationSignificantTimeChangeNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) { 39 | if(self.isAutoSynchronizedWhenUserChangeLocalTime) { 40 | [self synchronize]; 41 | } 42 | }]; 43 | } 44 | 45 | return self; 46 | } 47 | 48 | - (void)dealloc { 49 | [[NSNotificationCenter defaultCenter] removeObserver:self]; 50 | } 51 | 52 | - (void)reset { 53 | self.isSynchronized = NO; 54 | [self finishAssociations]; 55 | [self.timeAssociations removeAllObjects]; 56 | } 57 | 58 | // Return the offset to network-derived UTC. 59 | 60 | - (NSTimeInterval)networkOffset { 61 | 62 | double timeInterval = 0.0; 63 | short usefulCount = 0; 64 | 65 | if(self.timeAssociations.count > 0) { 66 | 67 | NSArray *sortedArray = [[self.timeAssociations sortedArrayUsingDescriptors:self.sortDescriptors] filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id _Nonnull evaluatedObject, NSDictionary * _Nullable bindings) { 68 | return [evaluatedObject isKindOfClass:[NHNetAssociation class]]; 69 | }]]; 70 | 71 | for (NHNetAssociation * timeAssociation in sortedArray) { 72 | if (timeAssociation.active) { 73 | if (timeAssociation.trusty) { 74 | usefulCount++; 75 | timeInterval = timeInterval + timeAssociation.offset; 76 | } 77 | else { 78 | if ([self.timeAssociations count] > 8) { 79 | [self.timeAssociations removeObject:timeAssociation]; 80 | [timeAssociation finish]; 81 | } 82 | } 83 | 84 | if (usefulCount == 8) break; // use 8 best dispersions 85 | } 86 | } 87 | } 88 | 89 | if (usefulCount > 0) { 90 | timeInterval = timeInterval / usefulCount; 91 | } 92 | else { 93 | if(self.shouldUseSavedSynchronizedTime) { 94 | timeInterval = [[NSUserDefaults standardUserDefaults] doubleForKey:kTimeOffsetKey]; 95 | } 96 | } 97 | 98 | return timeInterval; 99 | } 100 | 101 | #pragma mark - Get time 102 | 103 | - (NSDate *)networkTime { 104 | return [[NSDate date] dateByAddingTimeInterval:-[self networkOffset]]; 105 | } 106 | 107 | #pragma mark - Associations 108 | 109 | // Use the following time servers or, if it exists, read the "ntp.hosts" file from the application resources and derive all the IP addresses referred to, remove any duplicates and create an 'association' (individual host client) for each one. 110 | 111 | - (void)createAssociations { 112 | @synchronized(self) { 113 | NSArray *ntpDomains; 114 | NSString *filePath = [[NSBundle mainBundle] pathForResource:@"ntp.hosts" ofType:@""]; 115 | if (nil == filePath) { 116 | ntpDomains = @[@"0.pool.ntp.org", 117 | @"0.uk.pool.ntp.org", 118 | @"0.us.pool.ntp.org", 119 | @"asia.pool.ntp.org", 120 | @"europe.pool.ntp.org", 121 | @"north-america.pool.ntp.org", 122 | @"south-america.pool.ntp.org", 123 | @"oceania.pool.ntp.org", 124 | @"africa.pool.ntp.org"]; 125 | } 126 | else { 127 | NSString *fileData = [[NSString alloc] initWithData:[[NSFileManager defaultManager] 128 | contentsAtPath:filePath] 129 | encoding:NSUTF8StringEncoding]; 130 | 131 | ntpDomains = [fileData componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]]; 132 | } 133 | 134 | // for each NTP service domain name in the 'ntp.hosts' file : "0.pool.ntp.org" etc ... 135 | NSMutableSet *hostAddresses = [NSMutableSet setWithCapacity:100]; 136 | 137 | for (NSString *ntpDomainName in ntpDomains) { 138 | if ([ntpDomainName length] == 0 || 139 | [ntpDomainName characterAtIndex:0] == ' ' || 140 | [ntpDomainName characterAtIndex:0] == '#') { 141 | continue; 142 | } 143 | 144 | // ... resolve the IP address of the named host : "0.pool.ntp.org" --> [123.45.67.89], ... 145 | CFHostRef ntpHostName = CFHostCreateWithName (nil, (__bridge CFStringRef)ntpDomainName); 146 | if (nil == ntpHostName) { 147 | NTP_Logging(@"CFHostCreateWithName for %@", ntpDomainName); 148 | continue; // couldn't create 'host object' ... 149 | } 150 | 151 | CFStreamError nameError; 152 | if (!CFHostStartInfoResolution (ntpHostName, kCFHostAddresses, &nameError)) { 153 | NTP_Logging(@"CFHostStartInfoResolution error %i for %@", (int)nameError.error, ntpDomainName); 154 | CFRelease(ntpHostName); 155 | continue; // couldn't start resolution ... 156 | } 157 | 158 | Boolean nameFound; 159 | CFArrayRef ntpHostAddrs = CFHostGetAddressing (ntpHostName, &nameFound); 160 | 161 | if (!nameFound) { 162 | NTP_Logging(@"CFHostGetAddressing: %@ NOT resolved", ntpHostName); 163 | CFRelease(ntpHostName); 164 | continue; // resolution failed ... 165 | } 166 | 167 | if (ntpHostAddrs == nil) { 168 | NTP_Logging(@"CFHostGetAddressing: no addresses resolved for %@", ntpHostName); 169 | CFRelease(ntpHostName); 170 | continue; // NO addresses were resolved ... 171 | } 172 | //for each (sockaddr structure wrapped by a CFDataRef/NSData *) associated with the hostname, drop the IP address string into a Set to remove duplicates. 173 | for (NSData *ntpHost in (__bridge NSArray *)ntpHostAddrs) { 174 | [hostAddresses addObject:[GCDAsyncUdpSocket hostFromAddress:ntpHost]]; 175 | } 176 | 177 | CFRelease(ntpHostName); 178 | } 179 | 180 | NTP_Logging(@"%@", hostAddresses); // all the addresses resolved 181 | 182 | // ... now start one 'association' (network clock server) for each address. 183 | for (NSString *server in hostAddresses) { 184 | NHNetAssociation * timeAssociation = [[NHNetAssociation alloc] initWithServerName:server]; 185 | timeAssociation.delegate = self; 186 | 187 | [self.timeAssociations addObject:timeAssociation]; 188 | [timeAssociation enable]; // starts are randomized internally 189 | } 190 | } 191 | } 192 | 193 | // Stop all the individual ntp clients associations .. 194 | 195 | - (void)finishAssociations { 196 | NSArray *timeAssociationsCopied = [self.timeAssociations copy]; 197 | for (NHNetAssociation * timeAssociation in timeAssociationsCopied) { 198 | timeAssociation.delegate = nil; 199 | [timeAssociation finish]; 200 | } 201 | 202 | [[NSNotificationCenter defaultCenter] removeObserver:self]; 203 | } 204 | 205 | #pragma mark - Sync 206 | 207 | - (void)synchronize { 208 | [self reset]; 209 | 210 | [[[NSOperationQueue alloc] init] addOperation:[[NSInvocationOperation alloc] 211 | initWithTarget:self 212 | selector:@selector(createAssociations) 213 | object:nil]]; 214 | } 215 | 216 | #pragma mark - NHNetAssociationDelegate 217 | 218 | - (void)netAssociationDidFinishGetTime:(NHNetAssociation *)netAssociation { 219 | if(netAssociation.active && netAssociation.trusty) { 220 | 221 | [[NSUserDefaults standardUserDefaults] setDouble:netAssociation.offset forKey:kTimeOffsetKey]; 222 | 223 | if (self.isSynchronized == NO) { 224 | [[NSNotificationCenter defaultCenter] postNotificationName:kNHNetworkTimeSyncCompleteNotification object:nil userInfo:nil]; 225 | self.isSynchronized = YES; 226 | } 227 | } 228 | } 229 | 230 | @end 231 | -------------------------------------------------------------------------------- /Example/NHNetworkTimeExample/NHNetworkTimeExample/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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384 | rootObject = 6145E9931BAE61930090DEC0 /* Project object */; 385 | } 386 | -------------------------------------------------------------------------------- /NHNetworkTime/NHNetAssociation.m: -------------------------------------------------------------------------------- 1 | #import "NHNetAssociation.h" 2 | #import 3 | #import "NHNTLog.h" 4 | #import "NSDate+NetworkClock.h" 5 | 6 | /*┌──────────────────────────────────────────────────────────────────────────────────────────────────┐ 7 | │ NTP Timestamp Structure │ 8 | │ │ 9 | │ 0 1 2 3 │ 10 | │ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 │ 11 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 12 | │ | Seconds | │ 13 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 14 | │ | Seconds Fraction (0-padded) | <-- 4294967296 = 1 second │ 15 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 16 | └──────────────────────────────────────────────────────────────────────────────────────────────────┘*/ 17 | 18 | #pragma mark - Time converter 19 | 20 | #define JAN_1970 0x83aa7e80 // UNIX epoch in NTP's epoch: 21 | // 1970-1900 (2,208,988,800s) 22 | typedef struct ntpTimestamp { 23 | uint32_t wholeSeconds; 24 | uint32_t fractSeconds; 25 | } NHTimeStamp; 26 | 27 | static NHTimeStamp NTP_1970 = {JAN_1970, 0}; // network time for 1 January 1970, GMT 28 | 29 | static double pollIntervals[18] = { 30 | 2.0, 16.0, 16.0, 16.0, 16.0, 35.0, 72.0, 127.0, 258.0, 31 | 511.0, 1024.0, 2048.0, 4096.0, 8192.0, 16384.0, 32768.0, 65536.0, 131072.0 32 | }; 33 | 34 | // Convert from Unix time to NTP time 35 | void unix2ntp(const struct timeval * tv, NHTimeStamp *ntp) { 36 | ntp->wholeSeconds = (uint32_t)(tv->tv_sec + JAN_1970); 37 | ntp->fractSeconds = (uint32_t)(((double)tv->tv_usec + 0.5) * (double)(1LL<<32) * 1.0e-6); 38 | } 39 | 40 | // Convert from NTP time to Unix time 41 | void ntp2unix(const NHTimeStamp *ntp, struct timeval *tv) { 42 | tv->tv_sec = ntp->wholeSeconds - JAN_1970; 43 | tv->tv_usec = (uint32_t)((double)ntp->fractSeconds / (1LL<<32) * 1.0e6); 44 | } 45 | 46 | // get current time in NTP format 47 | void ntp_time_now(NHTimeStamp *ntp) { 48 | struct timeval now; 49 | gettimeofday(&now, (struct timezone *)NULL); 50 | unix2ntp(&now, ntp); 51 | } 52 | 53 | // get (ntpTime2 - ntpTime1) in (double) seconds 54 | double ntpDiffSeconds(NHTimeStamp *start, NHTimeStamp *stop) { 55 | int32_t a; 56 | uint32_t b; 57 | a = stop->wholeSeconds - start->wholeSeconds; 58 | if (stop->fractSeconds >= start->fractSeconds) { 59 | b = stop->fractSeconds - start->fractSeconds; 60 | } 61 | else { 62 | b = start->fractSeconds - stop->fractSeconds; 63 | b = ~b; 64 | a -= 1; 65 | } 66 | 67 | return a + b / 4294967296.0; 68 | } 69 | 70 | @interface NHNetAssociation() { 71 | double fifoQueue[8]; 72 | 73 | NHTimeStamp ntpClientSendTime; 74 | NHTimeStamp ntpServerRecvTime; 75 | NHTimeStamp ntpServerSendTime; 76 | NHTimeStamp ntpClientRecvTime; 77 | NHTimeStamp ntpServerBaseTime; 78 | } 79 | 80 | @property GCDAsyncUdpSocket *socket; 81 | @property NSTimer *repeatingTimer; // fires off an ntp request ... 82 | @property int pollingIntervalIndex; // index into polling interval table 83 | 84 | @property int stratum; 85 | @property double timerWobbleFactor; // 0.75 .. 1.25 86 | @property short fifoIndex; 87 | 88 | @property (readonly) double dispersion; // milliSeconds 89 | @property (readonly) double roundtrip; // seconds 90 | 91 | @property (strong, nonatomic) NSMutableArray *observers; 92 | 93 | @end 94 | 95 | @implementation NHNetAssociation 96 | 97 | //Initialize the association with a blank socket and prepare the time transaction to happen every 16 seconds (initial value) 98 | 99 | - (instancetype)initWithServerName:(NSString *) serverName { 100 | if (self = [super init]) { 101 | self.pollingIntervalIndex = 0; // ensure the first timer firing is soon 102 | _active = FALSE; // isn't running till it reports time ... 103 | _trusty = FALSE; // don't trust this clock to start with ... 104 | _offset = INFINITY; // start with net clock meaningless 105 | _server = serverName; 106 | 107 | self.socket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self 108 | delegateQueue:dispatch_queue_create( 109 | [serverName cStringUsingEncoding:NSUTF8StringEncoding], DISPATCH_QUEUE_SERIAL)]; 110 | 111 | [self registerObservations]; 112 | } 113 | 114 | return self; 115 | } 116 | 117 | - (void)dealloc { 118 | [self unregisterObservations]; 119 | } 120 | 121 | - (void)enable { 122 | 123 | // Create a first-in/first-out queue for time samples. As we compute each new time obtained from the server we push it into the fifo. We sample the contents of the fifo for quality and, if it meets our standards we use the contents of the fifo to obtain a weighted average of the times. 124 | for (short i = 0; i < 8; i++) fifoQueue[i] = NAN; // set fifo to all empty 125 | self.fifoIndex = 0; 126 | 127 | // Finally, initialize the repeating timer that queries the server, set it's trigger time to the infinite future, and put it on the run loop .. nothing will happen (yet) 128 | self.repeatingTimer = [NSTimer timerWithTimeInterval:MAXFLOAT 129 | target:self selector:@selector(queryTimeServer) 130 | userInfo:nil repeats:YES]; 131 | self.repeatingTimer.tolerance = 1.0; // it can be up to 1 second late 132 | [[NSRunLoop mainRunLoop] addTimer:self.repeatingTimer forMode:NSDefaultRunLoopMode]; 133 | 134 | // now start the timer .. fire the first one soon, and put some wobble in its timing so we don't get pulses of activity. 135 | self.timerWobbleFactor = ((float)rand()/(float)RAND_MAX / 2.0) + 0.75; // 0.75 .. 1.25 136 | NSTimeInterval interval = pollIntervals[self.pollingIntervalIndex] * self.timerWobbleFactor; 137 | [self.repeatingTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:interval]]; 138 | 139 | self.pollingIntervalIndex = 4; // subsequent timers fire at default intervals 140 | } 141 | 142 | // Set the receiver and send the time query with 2 second timeout, ... 143 | - (void)queryTimeServer { 144 | [self sendTimeQuery]; 145 | 146 | // Put some wobble into the repeating time so they don't synchronize and thump the network 147 | self.timerWobbleFactor = ((float)rand()/(float)RAND_MAX / 2.0) + 0.75; // 0.75 .. 1.25 148 | NSTimeInterval interval = pollIntervals[self.pollingIntervalIndex] * self.timerWobbleFactor; 149 | [self.repeatingTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:interval]]; 150 | } 151 | 152 | - (void)sendTimeQuery { 153 | NSError * error = nil; 154 | 155 | [self.socket sendData:[self createPacket] toHost:_server port:123 withTimeout:2.0 tag:0]; 156 | 157 | if(![self.socket beginReceiving:&error]) { 158 | NTP_Logging(@"Unable to start listening on socket for [%@] due to error [%@]", _server, error); 159 | return; 160 | } 161 | } 162 | 163 | - (void)finish { 164 | [self.repeatingTimer invalidate]; 165 | 166 | for (short i = 0; i < 8; i++) fifoQueue[i] = NAN; // set fifo to all empty 167 | self.fifoIndex = 0; 168 | 169 | _active = FALSE; 170 | 171 | if(self.socket) { 172 | [self.socket close]; 173 | } 174 | } 175 | 176 | #pragma mark - Network transactions 177 | 178 | /*┌──────────────────────────────────────────────────────────────────────────────────────────────────┐ 179 | │ Create a time query packet ... │ 180 | │──────────────────────────────────────────────────────────────────────────────────────────────────│ 181 | │ │ 182 | │ 1 2 3 │ 183 | │ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 │ 184 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 185 | │ [ 0] | L | Ver |Mode | Stratum | Poll | Precision | │ 186 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 187 | │ [ 1] | Root Delay (32) | in NTP short format │ 188 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 189 | │ [ 2] | Root Dispersion (32) | in NTP short format │ 190 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 191 | │ [ 3] | Reference Identifier | │ 192 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 193 | │ [ 4] | | │ 194 | │ | Reference Timestamp (64) | in NTP long format │ 195 | │ [ 5] | | │ 196 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 197 | │ [ 6] | | │ 198 | │ | Originate Timestamp (64) | in NTP long format │ 199 | │ [ 7] | | │ 200 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 201 | │ [ 8] | | │ 202 | │ | Receive Timestamp (64) | in NTP long format │ 203 | │ [ 9] | | │ 204 | │ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ │ 205 | │ [10] | | │ 206 | │ | Transmit Timestamp (64) | in NTP long format │ 207 | │ [11] | | │ 208 | │ │ 209 | └──────────────────────────────────────────────────────────────────────────────────────────────────┘*/ 210 | 211 | - (NSData *)createPacket { 212 | uint32_t wireData[12]; 213 | 214 | memset(wireData, 0, sizeof wireData); 215 | wireData[0] = htonl((0 << 30) | // no Leap Indicator 216 | (4 << 27) | // NTP v4 217 | (3 << 24) | // mode = client sending 218 | (0 << 16) | // stratum (n/a) 219 | (4 << 8) | // polling rate (16 secs) 220 | (-6 & 0xff)); // precision (~15 mSecs) 221 | wireData[1] = htonl(1<<16); 222 | wireData[2] = htonl(1<<16); 223 | 224 | ntp_time_now(&ntpClientSendTime); 225 | 226 | wireData[10] = htonl(ntpClientSendTime.wholeSeconds); // Transmit Timestamp 227 | wireData[11] = htonl(ntpClientSendTime.fractSeconds); 228 | 229 | return [NSData dataWithBytes:wireData length:48]; 230 | } 231 | 232 | - (void)decodePacket:(NSData *) data { 233 | NHNetworkClock *sharedClock = [NHNetworkClock sharedNetworkClock]; 234 | 235 | @synchronized(sharedClock) { 236 | // grab the packet arrival time as fast as possible, before computations below ... 237 | ntp_time_now(&ntpClientRecvTime); 238 | 239 | uint32_t wireData[12]; 240 | [data getBytes:wireData length:48]; 241 | 242 | int mode = ntohl(wireData[0]) >> 24 & 0x07; 243 | self.stratum = ntohl(wireData[0]) >> 16 & 0xff; 244 | 245 | _dispersion = ntohl(wireData[2]) * 0.0152587890625; // error (mS) 246 | 247 | ntpServerBaseTime.wholeSeconds = ntohl(wireData[4]); // when server clock was wound 248 | ntpServerBaseTime.fractSeconds = ntohl(wireData[5]); 249 | 250 | // if the send time in the packet isn't the same as the remembered send time, ditch it ... 251 | if (ntpClientSendTime.wholeSeconds != ntohl(wireData[6]) || 252 | ntpClientSendTime.fractSeconds != ntohl(wireData[7])) return; // NO; 253 | 254 | ntpServerRecvTime.wholeSeconds = ntohl(wireData[8]); 255 | ntpServerRecvTime.fractSeconds = ntohl(wireData[9]); 256 | ntpServerSendTime.wholeSeconds = ntohl(wireData[10]); 257 | ntpServerSendTime.fractSeconds = ntohl(wireData[11]); 258 | 259 | //determine the quality of this particular time if max_error is less than 50mS (and not zero) AND stratum > 0 AND the mode is 4 (packet came from server) AND the server clock was set less than 1 minute ago 260 | _offset = INFINITY; // clock meaningless 261 | if ((_dispersion < 50.0 && _dispersion > 0.00001) && 262 | (self.stratum > 0) && (mode == 4) && 263 | (ntpDiffSeconds(&ntpServerBaseTime, &ntpServerSendTime) < 60.0)) { 264 | 265 | double t41 = ntpDiffSeconds(&ntpClientSendTime, &ntpClientRecvTime); // .. (T4-T1) 266 | double t32 = ntpDiffSeconds(&ntpServerRecvTime, &ntpServerSendTime); // .. (T3-T2) 267 | 268 | _roundtrip = t41 - t32; 269 | 270 | double t21 = ntpDiffSeconds(&ntpServerSendTime, &ntpClientRecvTime); // .. (T2-T1) 271 | double t34 = ntpDiffSeconds(&ntpServerRecvTime, &ntpClientSendTime); // .. (T3-T4) 272 | 273 | _offset = (t21 + t34) / 2.0; // calculate offset 274 | 275 | _active = TRUE; 276 | } 277 | 278 | [self calculateTrusty]; 279 | 280 | dispatch_async(dispatch_get_main_queue(), ^{ 281 | if(self.delegate && [self.delegate respondsToSelector:@selector(netAssociationDidFinishGetTime:)]) { 282 | [self.delegate netAssociationDidFinishGetTime:self]; 283 | } 284 | }); 285 | } 286 | } 287 | 288 | - (void)calculateTrusty { 289 | // the packet is trustworthy -- compute and store offset in 8-slot fifo ... 290 | 291 | fifoQueue[self.fifoIndex++ % 8] = _offset; // store offset in seconds 292 | self.fifoIndex %= 8; // rotate index in range 293 | 294 | // look at the (up to eight) offsets in the fifo and and count 'good', 'fail' and 'not used yet' 295 | short good = 0, fail = 0, none = 0; 296 | _offset = 0.0; // reset for averaging 297 | 298 | for (short i = 0; i < 8; i++) { 299 | if (isnan(fifoQueue[i])) { // fifo slot is unused 300 | none++; 301 | continue; 302 | } 303 | if (isinf(fifoQueue[i]) || fabs(fifoQueue[i]) < 0.0001) { // server can't be trusted 304 | fail++; 305 | continue; 306 | } 307 | 308 | good++; 309 | _offset += fifoQueue[i]; // accumulate good times 310 | } 311 | 312 | // if we have at least one 'good' server response or four or more 'fail' responses, we'll inform our management accordingly. If we have less than four 'fails' we won't make any note of that ... we won't condemn a server until we get four 'fail' packets. 313 | double stdDev = 0.0; 314 | if (good > 0 || fail > 3) { 315 | _offset = _offset / good; // average good times 316 | 317 | for (short i = 0; i < 8; i++) { 318 | if (isnan(fifoQueue[i])) continue; 319 | 320 | if (isinf(fifoQueue[i]) || fabs(fifoQueue[i]) < 0.001) continue; 321 | 322 | stdDev += (fifoQueue[i] - _offset) * (fifoQueue[i] - _offset); 323 | } 324 | stdDev = sqrt(stdDev/(float)good); 325 | 326 | _trusty = (good+none > 4) && // four or more 'fails' 327 | (fabs(_offset) > stdDev*3.0); // s.d. < offset 328 | 329 | NTP_Logging(@" [%@] {%3.1f,%3.1f,%3.1f,%3.1f,%3.1f,%3.1f,%3.1f,%3.1f} ↑=%i, ↓=%i, %3.1f(%3.1f) %@", _server, 330 | fifoQueue[0]*1000.0, fifoQueue[1]*1000.0, fifoQueue[2]*1000.0, fifoQueue[3]*1000.0, 331 | fifoQueue[4]*1000.0, fifoQueue[5]*1000.0, fifoQueue[6]*1000.0, fifoQueue[7]*1000.0, 332 | good, fail, _offset*1000.0, stdDev*1000.0, _trusty ? @"↑" : @"↓"); 333 | 334 | } 335 | 336 | // if the association is providing times which don't vary much, we could increase its polling interval. In practice, once things settle down, the standard deviation on any time server seems to fall in the 70-120mS range (plenty close for our work). We usually pick up a few stratum=1 servers, it would be a Good Thing to not hammer those so hard ... 337 | if ((self.stratum == 1 && self.pollingIntervalIndex != 6) || 338 | (self.stratum == 2 && self.pollingIntervalIndex != 5)) { 339 | self.pollingIntervalIndex = 7 - self.stratum; 340 | } 341 | } 342 | 343 | #pragma mark - Network callbacks 344 | 345 | - (void)udpSocket:(GCDAsyncUdpSocket *)sock didConnectToAddress:(NSData *)address { 346 | NTP_Logging(@"didConnectToAddress"); 347 | } 348 | 349 | - (void)udpSocket:(GCDAsyncUdpSocket *)sock didNotConnect:(NSError *)error { 350 | NTP_Logging(@"didNotConnect - %@", error.description); 351 | } 352 | 353 | - (void)udpSocket:(GCDAsyncUdpSocket *)sock didSendDataWithTag:(long)tag { 354 | } 355 | 356 | - (void)udpSocket:(GCDAsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error { 357 | NTP_Logging(@"didNotSendDataWithTag - %@", error.description); 358 | } 359 | 360 | - (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data 361 | fromAddress:(NSData *)address withFilterContext:(id)filterContext { 362 | [self decodePacket:data]; 363 | } 364 | 365 | - (void)udpSocketDidClose:(GCDAsyncUdpSocket *)sock withError:(NSError *)error { 366 | NTP_Logging(@"Socket closed : [%@]", _server); 367 | } 368 | 369 | // Make an NSDate from ntpTimestamp ... (via seconds from JAN_1970) ... 370 | - (NSDate *) dateFromNetworkTime:(struct ntpTimestamp *) networkTime { 371 | return [NSDate dateWithTimeIntervalSince1970:ntpDiffSeconds(&NTP_1970, networkTime)]; 372 | } 373 | 374 | #pragma mark - Pretty printer 375 | 376 | - (NSString *)prettyPrintTimers { 377 | NSMutableString * prettyString = [NSMutableString stringWithFormat:@"prettyPrintTimers\n\n"]; 378 | 379 | [prettyString appendFormat:@"time server addr: [%@]\n" 380 | " round trip time: %7.3f (mS)\n" 381 | " clock offset: %7.3f (mS)\n\n", 382 | _server, _roundtrip * 1000.0, _offset * 1000.0]; 383 | 384 | return prettyString; 385 | } 386 | 387 | - (NSString *)description { 388 | return [NSString stringWithFormat:@"%@ [%@] stratum=%i; offset=%3.1f±%3.1fmS", 389 | _trusty ? @"↑" : @"↓", _server, self.stratum, _offset, _dispersion]; 390 | } 391 | 392 | #pragma mark - Notification Traps 393 | 394 | - (void)registerObservations { 395 | 396 | // if associations are going to have a life, they have to react to their app being backgrounded. 397 | 398 | __weak typeof(self) weakSelf = self; 399 | 400 | if(self.observers && self.observers.count > 0) { 401 | [self unregisterObservations]; 402 | } else { 403 | self.observers = [[NSMutableArray alloc] init]; 404 | } 405 | 406 | [self.observers addObject:[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidEnterBackgroundNotification 407 | object:nil 408 | queue:nil 409 | usingBlock:^ 410 | (NSNotification * note) { 411 | NTP_Logging(@"Application -> Background"); 412 | 413 | __strong typeof(weakSelf) strongSelf = weakSelf; 414 | 415 | if(strongSelf) { 416 | [strongSelf finish]; 417 | } 418 | }]]; 419 | 420 | [self.observers addObject:[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationWillEnterForegroundNotification 421 | object:nil 422 | queue:nil 423 | usingBlock:^ 424 | (NSNotification * note) { 425 | NTP_Logging(@"Application -> Foreground"); 426 | 427 | __strong typeof(weakSelf) strongSelf = weakSelf; 428 | 429 | if(strongSelf) { 430 | [strongSelf enable]; 431 | } 432 | }]]; 433 | 434 | // significantTimeChange -- trash the fifo .. 435 | [self.observers addObject:[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationSignificantTimeChangeNotification 436 | object:nil 437 | queue:nil 438 | usingBlock:^ 439 | (NSNotification * note) { 440 | NTP_Logging(@"Application -> SignificantTimeChange"); 441 | 442 | __strong typeof(weakSelf) strongSelf = weakSelf; 443 | 444 | if(strongSelf) { 445 | for (short i = 0; i < 8; i++) strongSelf->fifoQueue[i] = NAN; // set fifo to all empty 446 | strongSelf.fifoIndex = 0; 447 | } 448 | }]]; 449 | } 450 | 451 | - (void)unregisterObservations { 452 | if(self.observers) { 453 | for(id observer in self.observers) { 454 | [[NSNotificationCenter defaultCenter] removeObserver:observer]; 455 | } 456 | 457 | [self.observers removeAllObjects]; 458 | } 459 | } 460 | 461 | @end 462 | --------------------------------------------------------------------------------