├── README.md ├── .DS_Store ├── DYReachability ├── DYReachability │ ├── Assets.xcassets │ │ ├── Contents.json │ │ └── AppIcon.appiconset │ │ │ └── Contents.json │ ├── ViewController.h │ ├── AppDelegate.h │ ├── main.m │ ├── ViewController.m │ ├── DYNetNofication.h │ ├── Info.plist │ ├── Base.lproj │ │ ├── Main.storyboard │ │ └── LaunchScreen.storyboard │ ├── AppDelegate.m │ ├── Reachability.h │ ├── DYNetNofication.m │ ├── Reachability.m │ ├── SimplePing.h │ └── SimplePing.m └── DYReachability.xcodeproj │ ├── project.xcworkspace │ ├── contents.xcworkspacedata │ └── xcshareddata │ │ └── IDEWorkspaceChecks.plist │ └── project.pbxproj ├── LICENSE └── .gitignore /README.md: -------------------------------------------------------------------------------- 1 | 采用的是Reachability和PING 结合判断网络状态，避免Reachability无法判断网络是否可用。 2 | -------------------------------------------------------------------------------- /.DS_Store: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Daintly/DYReachability/HEAD/.DS_Store -------------------------------------------------------------------------------- /DYReachability/DYReachability/Assets.xcassets/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "info" : { 3 | "version" : 1, 4 | "author" : "xcode" 5 | } 6 | } -------------------------------------------------------------------------------- /DYReachability/DYReachability.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | 14 | @end 15 | 16 | -------------------------------------------------------------------------------- /DYReachability/DYReachability.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. 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 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // DYReachability 4 | // 5 | // Created by renwen on 2018/8/30. 6 | // Copyright © 2018年 Dainty. 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 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | #import "DYNetNofication.h" 11 | @interface ViewController () 12 | @property (nonatomic, strong)DYNetNofication *nettion; 13 | @end 14 | 15 | @implementation ViewController 16 | 17 | - (void)viewDidLoad { 18 | [super viewDidLoad]; 19 | 20 | } 21 | 22 | - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ 23 | self.nettion = [DYNetNofication defultNotification]; 24 | [self.nettion startNotification]; 25 | } 26 | - (void)didReceiveMemoryWarning { 27 | [super didReceiveMemoryWarning]; 28 | // Dispose of any resources that can be recreated. 29 | } 30 | 31 | 32 | @end 33 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Daintly 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/DYNetNofication.h: -------------------------------------------------------------------------------- 1 | // 2 | // DYNetNofication.h 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | /* 12 | * 定义一个网络状态的全局通知 13 | */ 14 | extern NSString *const DYReachabilityChangeNotification; 15 | 16 | typedef NS_ENUM(NSInteger ,DYNetworkStatus){ 17 | DYNetworkStatusNone = 0 , 18 | DYNetworkStatusUnknown = 1 , 19 | DYNetworkStatus3G = 2 , 20 | DYNetworkStatus4G = 3 , 21 | DYNetworkStatusWifi = 4 22 | 23 | }; 24 | 25 | @protocol DYNetNoficationDelegate 26 | 27 | - (void)host:(NSString *)host networkStatusDidChanged:(DYNetworkStatus)status; 28 | @end 29 | @interface DYNetNofication : NSObject 30 | @property (nonatomic ,assign) DYNetworkStatus networkStatus; 31 | @property (nonatomic, weak) id delegate; 32 | /* 33 | *默认www.baidu.com 34 | */ 35 | + (instancetype)defultNotification; 36 | 37 | - (void)startNotification; 38 | - (void)stopNotification; 39 | @end 40 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 4 | 5 | ## Build generated 6 | build/ 7 | DerivedData/ 8 | 9 | ## Various settings 10 | *.pbxuser 11 | !default.pbxuser 12 | *.mode1v3 13 | !default.mode1v3 14 | *.mode2v3 15 | !default.mode2v3 16 | *.perspectivev3 17 | !default.perspectivev3 18 | xcuserdata/ 19 | 20 | ## Other 21 | *.moved-aside 22 | *.xccheckout 23 | *.xcscmblueprint 24 | 25 | ## Obj-C/Swift specific 26 | *.hmap 27 | *.ipa 28 | *.dSYM.zip 29 | *.dSYM 30 | 31 | # CocoaPods 32 | # 33 | # We recommend against adding the Pods directory to your .gitignore. However 34 | # you should judge for yourself, the pros and cons are mentioned at: 35 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control 36 | # 37 | # Pods/ 38 | 39 | # Carthage 40 | # 41 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 42 | # Carthage/Checkouts 43 | 44 | Carthage/Build 45 | 46 | # fastlane 47 | # 48 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 49 | # screenshots whenever they are needed. 50 | # For more information about the recommended setup visit: 51 | # https://docs.fastlane.tools/best-practices/source-control/#source-control 52 | 53 | fastlane/report.xml 54 | fastlane/Preview.html 55 | fastlane/screenshots/**/*.png 56 | fastlane/test_output 57 | 58 | # Code Injection 59 | # 60 | # After new code Injection tools there's a generated folder /iOSInjectionProject 61 | # https://github.com/johnno1962/injectionforxcode 62 | 63 | iOSInjectionProject/ 64 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | $(DEVELOPMENT_LANGUAGE) 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 | CFBundleVersion 20 | 1 21 | LSRequiresIPhoneOS 22 | 23 | UILaunchStoryboardName 24 | LaunchScreen 25 | UIMainStoryboardFile 26 | Main 27 | UIRequiredDeviceCapabilities 28 | 29 | armv7 30 | 31 | UISupportedInterfaceOrientations 32 | 33 | UIInterfaceOrientationPortrait 34 | UIInterfaceOrientationLandscapeLeft 35 | UIInterfaceOrientationLandscapeRight 36 | 37 | UISupportedInterfaceOrientations~ipad 38 | 39 | UIInterfaceOrientationPortrait 40 | UIInterfaceOrientationPortraitUpsideDown 41 | UIInterfaceOrientationLandscapeLeft 42 | UIInterfaceOrientationLandscapeRight 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/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 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/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 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. All rights reserved. 7 | // 8 | 9 | #import "AppDelegate.h" 10 | 11 | @interface AppDelegate () 12 | 13 | @end 14 | 15 | @implementation AppDelegate 16 | 17 | 18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 19 | // Override point for customization after application launch. 20 | return YES; 21 | } 22 | 23 | 24 | - (void)applicationWillResignActive:(UIApplication *)application { 25 | 26 | } 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 | 35 | - (void)applicationWillEnterForeground:(UIApplication *)application { 36 | // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. 37 | } 38 | 39 | 40 | - (void)applicationDidBecomeActive:(UIApplication *)application { 41 | // 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. 42 | } 43 | 44 | 45 | - (void)applicationWillTerminate:(UIApplication *)application { 46 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 47 | } 48 | 49 | 50 | @end 51 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/Reachability.h: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (C) 2016 Apple Inc. All Rights Reserved. 3 | See LICENSE.txt for this sample’s licensing information 4 | 5 | Abstract: 6 | Basic demonstration of how to use the SystemConfiguration Reachablity APIs. 7 | */ 8 | 9 | #import 10 | #import 11 | #import 12 | 13 | 14 | typedef enum : NSInteger { 15 | NotReachable = 0, 16 | ReachableViaWiFi, 17 | ReachableViaWWAN 18 | } NetworkStatus; 19 | 20 | #pragma mark IPv6 Support 21 | //Reachability fully support IPv6. For full details, see ReadMe.md. 22 | 23 | 24 | extern NSString *kReachabilityChangedNotification; 25 | 26 | 27 | @interface Reachability : NSObject 28 | 29 | 30 | 31 | /*! 32 | * Use to check the reachability of a given host name. 33 | */ 34 | + (instancetype)reachabilityWithHostName:(NSString *)hostName; 35 | 36 | /*! 37 | * Use to check the reachability of a given IP address. 38 | */ 39 | + (instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress; 40 | 41 | /*! 42 | * Checks whether the default route is available. Should be used by applications that do not connect to a particular host. 43 | */ 44 | + (instancetype)reachabilityForInternetConnection; 45 | 46 | 47 | #pragma mark reachabilityForLocalWiFi 48 | //reachabilityForLocalWiFi has been removed from the sample. See ReadMe.md for more information. 49 | //+ (instancetype)reachabilityForLocalWiFi; 50 | 51 | /*! 52 | * Start listening for reachability notifications on the current run loop. 53 | */ 54 | - (BOOL)startNotifier; 55 | - (void)stopNotifier; 56 | 57 | - (NetworkStatus)currentReachabilityStatus; 58 | 59 | /*! 60 | * WWAN may be available, but not active until a connection has been established. WiFi may require a connection for VPN on Demand. 61 | */ 62 | - (BOOL)connectionRequired; 63 | 64 | @end 65 | 66 | 67 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "size" : "20x20", 6 | "scale" : "2x" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "size" : "20x20", 11 | "scale" : "3x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "29x29", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "size" : "29x29", 21 | "scale" : "3x" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "size" : "40x40", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "size" : "40x40", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "idiom" : "iphone", 35 | "size" : "60x60", 36 | "scale" : "2x" 37 | }, 38 | { 39 | "idiom" : "iphone", 40 | "size" : "60x60", 41 | "scale" : "3x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "20x20", 46 | "scale" : "1x" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "size" : "20x20", 51 | "scale" : "2x" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "size" : "29x29", 56 | "scale" : "1x" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "size" : "29x29", 61 | "scale" : "2x" 62 | }, 63 | { 64 | "idiom" : "ipad", 65 | "size" : "40x40", 66 | "scale" : "1x" 67 | }, 68 | { 69 | "idiom" : "ipad", 70 | "size" : "40x40", 71 | "scale" : "2x" 72 | }, 73 | { 74 | "idiom" : "ipad", 75 | "size" : "76x76", 76 | "scale" : "1x" 77 | }, 78 | { 79 | "idiom" : "ipad", 80 | "size" : "76x76", 81 | "scale" : "2x" 82 | }, 83 | { 84 | "idiom" : "ipad", 85 | "size" : "83.5x83.5", 86 | "scale" : "2x" 87 | }, 88 | { 89 | "idiom" : "ios-marketing", 90 | "size" : "1024x1024", 91 | "scale" : "1x" 92 | } 93 | ], 94 | "info" : { 95 | "version" : 1, 96 | "author" : "xcode" 97 | } 98 | } -------------------------------------------------------------------------------- /DYReachability/DYReachability/DYNetNofication.m: -------------------------------------------------------------------------------- 1 | // 2 | // DYNetNofication.m 3 | // DYReachability 4 | // 5 | // Created by Dainty on 2018/9/1. 6 | // Copyright © 2018年 Dainty. All rights reserved. 7 | // 8 | 9 | #import "DYNetNofication.h" 10 | #import "Reachability.h" 11 | #import 12 | #include 13 | @interface DYNetNofication () 14 | @property (nonatomic, strong) Reachability *hostReachability; 15 | @property (nonatomic, strong) NSDictionary *networkDict ; 16 | @end 17 | @implementation DYNetNofication 18 | 19 | static NSString *const hoststring = @"www.baidu.com"; 20 | + (instancetype)defultNotification{ 21 | 22 | static DYNetNofication *fication = nil; 23 | static dispatch_once_t onceToken; 24 | dispatch_once(&onceToken, ^{ 25 | if (!fication) { 26 | fication = [DYNetNofication new]; 27 | 28 | } 29 | }); 30 | return fication; 31 | } 32 | 33 | 34 | - (void)reachabilityChanged:(NSNotification*)notifi{ 35 | BOOL reachStatus = [self.hostReachability currentReachabilityStatus]; 36 | BOOL pingStatus = pingtest(); 37 | if (reachStatus&&pingStatus){ 38 | self.networkStatus = self.netWorkDetailStatus; 39 | }else{ 40 | self.networkStatus = DYNetworkStatusNone; 41 | } 42 | 43 | } 44 | 45 | - (void)dealloc{ 46 | [self.hostReachability stopNotifier]; 47 | 48 | } 49 | #pragma mark - function 50 | 51 | - (void)startNotification{ 52 | [self.hostReachability startNotifier]; 53 | 54 | } 55 | 56 | - (void)stopNotification{ 57 | [self.hostReachability stopNotifier]; 58 | 59 | } 60 | 61 | 62 | - (void)setNetworkStatus:(DYNetworkStatus)networkStatus{ 63 | if (_networkStatus != networkStatus) { 64 | _networkStatus = networkStatus; 65 | 66 | } 67 | NSLog(@"-----%@-----",[self.networkDict objectForKey:@(networkStatus)]); 68 | 69 | if ([self.delegate respondsToSelector:@selector(host:networkStatusDidChanged:)]) { 70 | [self.delegate host:hoststring networkStatusDidChanged:_networkStatus]; 71 | } 72 | } 73 | 74 | - (Reachability *)hostReachability{ 75 | if (!_hostReachability) { 76 | _hostReachability = [Reachability reachabilityWithHostName:hoststring]; 77 | 78 | [[NSNotificationCenter defaultCenter] addObserver:self 79 | selector:@selector(reachabilityChanged:) 80 | name:kReachabilityChangedNotification 81 | object:nil]; 82 | 83 | }return _hostReachability; 84 | } 85 | 86 | 87 | /** 根据状态栏获取详细的网络状态*/ 88 | - (DYNetworkStatus)netWorkDetailStatus{ 89 | UIApplication *app = [UIApplication sharedApplication]; 90 | // UIView *statusBar = [app valueForKeyPath:@"statusBar"]; 91 | 92 | id statusBar = [[UIApplication sharedApplication] valueForKey:@"statusBar"]; 93 | 94 | NSArray *childrenView ; 95 | if ([statusBar isKindOfClass:NSClassFromString(@"UIStatusBar_Modern")]) { 96 | childrenView = [[[statusBar valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews]; 97 | } else { 98 | childrenView = [[statusBar valueForKey:@"foregroundView"] subviews]; 99 | } 100 | 101 | UIView *networkView = nil; 102 | 103 | for (UIView *childView in childrenView) { 104 | if ([childView isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) { 105 | networkView = childView; 106 | } 107 | } 108 | 109 | 110 | 111 | DYNetworkStatus status = DYNetworkStatusNone; 112 | if (networkView){ 113 | int type = [[networkView valueForKeyPath:@"dataNetworkType"] intValue]; 114 | switch (type){ 115 | case 0: 116 | status = DYNetworkStatusNone; 117 | break; 118 | case 1: 119 | status = DYNetworkStatusUnknown; 120 | break; 121 | case 2: 122 | status = DYNetworkStatus3G; 123 | break; 124 | case 3: 125 | status = DYNetworkStatus4G; 126 | break; 127 | case 5: 128 | status = DYNetworkStatusWifi; 129 | break; 130 | default: 131 | status = DYNetworkStatusUnknown; 132 | break; 133 | } 134 | } 135 | return status; 136 | } 137 | 138 | 139 | 140 | static int pingtest() 141 | { 142 | struct hostent *url; 143 | 144 | url = gethostbyname([hoststring UTF8String]); 145 | if(url == NULL) 146 | { 147 | printf("Pingtest Failed!\n"); 148 | return 0; 149 | } 150 | else if(!strcmp("10.10.0.1",inet_ntoa(*((struct in_addr *)url->h_addr)))) 151 | { 152 | printf("DNS cheat!\n"); 153 | return 0; 154 | } 155 | else 156 | { 157 | printf("IP Address : %s\n",inet_ntoa(*((struct in_addr *)url->h_addr))); 158 | printf("Pingtest OK!\n"); 159 | return 1; 160 | } 161 | } 162 | 163 | 164 | - (NSDictionary *)networkDict{ 165 | return @{ 166 | @(DYNetworkStatusNone) : @"无网络", 167 | @(DYNetworkStatusUnknown) : @"未知网络", 168 | @(DYNetworkStatus3G) : @"3G网络", 169 | @(DYNetworkStatus4G) : @"4G网络", 170 | @(DYNetworkStatusWifi) : @"WIFI网络", 171 | }; 172 | } 173 | @end 174 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/Reachability.m: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (C) 2016 Apple Inc. All Rights Reserved. 3 | See LICENSE.txt for this sample’s licensing information 4 | 5 | Abstract: 6 | Basic demonstration of how to use the SystemConfiguration Reachablity APIs. 7 | */ 8 | 9 | #import 10 | #import 11 | #import 12 | #import 13 | #import 14 | 15 | #import 16 | 17 | #import "Reachability.h" 18 | 19 | #pragma mark IPv6 Support 20 | //Reachability fully support IPv6. For full details, see ReadMe.md. 21 | 22 | 23 | NSString *kReachabilityChangedNotification = @"kNetworkReachabilityChangedNotification"; 24 | 25 | 26 | #pragma mark - Supporting functions 27 | 28 | #define kShouldPrintReachabilityFlags 1 29 | 30 | static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment) 31 | { 32 | #if kShouldPrintReachabilityFlags 33 | 34 | NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n", 35 | (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-', 36 | (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-', 37 | 38 | (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-', 39 | (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-', 40 | (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-', 41 | (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-', 42 | (flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-', 43 | (flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-', 44 | (flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-', 45 | comment 46 | ); 47 | #endif 48 | } 49 | 50 | 51 | static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) 52 | { 53 | #pragma unused (target, flags) 54 | NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback"); 55 | NSCAssert([(__bridge NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback"); 56 | 57 | Reachability* noteObject = (__bridge Reachability *)info; 58 | // Post a notification to notify the client that the network reachability changed. 59 | [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: noteObject]; 60 | } 61 | 62 | 63 | #pragma mark - Reachability implementation 64 | 65 | @implementation Reachability 66 | { 67 | SCNetworkReachabilityRef _reachabilityRef; 68 | } 69 | 70 | + (instancetype)reachabilityWithHostName:(NSString *)hostName 71 | { 72 | Reachability* returnValue = NULL; 73 | SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]); 74 | if (reachability != NULL) 75 | { 76 | returnValue= [[self alloc] init]; 77 | if (returnValue != NULL) 78 | { 79 | returnValue->_reachabilityRef = reachability; 80 | } 81 | else { 82 | CFRelease(reachability); 83 | } 84 | } 85 | return returnValue; 86 | } 87 | 88 | 89 | + (instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress 90 | { 91 | SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, hostAddress); 92 | 93 | Reachability* returnValue = NULL; 94 | 95 | if (reachability != NULL) 96 | { 97 | returnValue = [[self alloc] init]; 98 | if (returnValue != NULL) 99 | { 100 | returnValue->_reachabilityRef = reachability; 101 | } 102 | else { 103 | CFRelease(reachability); 104 | } 105 | } 106 | return returnValue; 107 | } 108 | 109 | 110 | + (instancetype)reachabilityForInternetConnection 111 | { 112 | struct sockaddr_in zeroAddress; 113 | bzero(&zeroAddress, sizeof(zeroAddress)); 114 | zeroAddress.sin_len = sizeof(zeroAddress); 115 | zeroAddress.sin_family = AF_INET; 116 | 117 | return [self reachabilityWithAddress: (const struct sockaddr *) &zeroAddress]; 118 | } 119 | 120 | #pragma mark reachabilityForLocalWiFi 121 | //reachabilityForLocalWiFi has been removed from the sample. See ReadMe.md for more information. 122 | //+ (instancetype)reachabilityForLocalWiFi 123 | 124 | 125 | 126 | #pragma mark - Start and stop notifier 127 | 128 | - (BOOL)startNotifier 129 | { 130 | BOOL returnValue = NO; 131 | SCNetworkReachabilityContext context = {0, (__bridge void *)(self), NULL, NULL, NULL}; 132 | 133 | if (SCNetworkReachabilitySetCallback(_reachabilityRef, ReachabilityCallback, &context)) 134 | { 135 | if (SCNetworkReachabilityScheduleWithRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)) 136 | { 137 | returnValue = YES; 138 | } 139 | } 140 | 141 | return returnValue; 142 | } 143 | 144 | 145 | - (void)stopNotifier 146 | { 147 | if (_reachabilityRef != NULL) 148 | { 149 | SCNetworkReachabilityUnscheduleFromRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); 150 | } 151 | } 152 | 153 | 154 | - (void)dealloc 155 | { 156 | [self stopNotifier]; 157 | if (_reachabilityRef != NULL) 158 | { 159 | CFRelease(_reachabilityRef); 160 | } 161 | } 162 | 163 | 164 | #pragma mark - Network Flag Handling 165 | 166 | - (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags 167 | { 168 | PrintReachabilityFlags(flags, "networkStatusForFlags"); 169 | if ((flags & kSCNetworkReachabilityFlagsReachable) == 0) 170 | { 171 | // The target host is not reachable. 172 | return NotReachable; 173 | } 174 | 175 | NetworkStatus returnValue = NotReachable; 176 | 177 | if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0) 178 | { 179 | /* 180 | If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi... 181 | */ 182 | returnValue = ReachableViaWiFi; 183 | } 184 | 185 | if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) || 186 | (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0)) 187 | { 188 | /* 189 | ... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs... 190 | */ 191 | 192 | if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0) 193 | { 194 | /* 195 | ... and no [user] intervention is needed... 196 | */ 197 | returnValue = ReachableViaWiFi; 198 | } 199 | } 200 | 201 | if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN) 202 | { 203 | /* 204 | ... but WWAN connections are OK if the calling application is using the CFNetwork APIs. 205 | */ 206 | returnValue = ReachableViaWWAN; 207 | } 208 | 209 | return returnValue; 210 | } 211 | 212 | 213 | - (BOOL)connectionRequired 214 | { 215 | NSAssert(_reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef"); 216 | SCNetworkReachabilityFlags flags; 217 | 218 | if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)) 219 | { 220 | return (flags & kSCNetworkReachabilityFlagsConnectionRequired); 221 | } 222 | 223 | return NO; 224 | } 225 | 226 | 227 | - (NetworkStatus)currentReachabilityStatus 228 | { 229 | NSAssert(_reachabilityRef != NULL, @"currentNetworkStatus called with NULL SCNetworkReachabilityRef"); 230 | NetworkStatus returnValue = NotReachable; 231 | SCNetworkReachabilityFlags flags; 232 | 233 | if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)) 234 | { 235 | returnValue = [self networkStatusForFlags:flags]; 236 | } 237 | 238 | return returnValue; 239 | } 240 | 241 | 242 | @end 243 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/SimplePing.h: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (C) 2016 Apple Inc. All Rights Reserved. 3 | See LICENSE.txt for this sample’s licensing information 4 | 5 | Abstract: 6 | An object wrapper around the low-level BSD Sockets ping function. 7 | */ 8 | 9 | @import Foundation; 10 | 11 | #include // for __Check_Compile_Time 12 | 13 | NS_ASSUME_NONNULL_BEGIN 14 | 15 | @protocol SimplePingDelegate; 16 | 17 | /*! Controls the IP address version used by SimplePing instances. 18 | */ 19 | 20 | typedef NS_ENUM(NSInteger, SimplePingAddressStyle) { 21 | SimplePingAddressStyleAny, ///< Use the first IPv4 or IPv6 address found; the default. 22 | SimplePingAddressStyleICMPv4, ///< Use the first IPv4 address found. 23 | SimplePingAddressStyleICMPv6 ///< Use the first IPv6 address found. 24 | }; 25 | 26 | /*! An object wrapper around the low-level BSD Sockets ping function. 27 | * \details To use the class create an instance, set the delegate and call `-start` 28 | * to start the instance on the current run loop. If things go well you'll soon get the 29 | * `-simplePing:didStartWithAddress:` delegate callback. From there you can can call 30 | * `-sendPingWithData:` to send a ping and you'll receive the 31 | * `-simplePing:didReceivePingResponsePacket:sequenceNumber:` and 32 | * `-simplePing:didReceiveUnexpectedPacket:` delegate callbacks as ICMP packets arrive. 33 | * 34 | * The class can be used from any thread but the use of any single instance must be 35 | * confined to a specific thread and that thread must run its run loop. 36 | */ 37 | 38 | @interface SimplePing : NSObject 39 | 40 | - (instancetype)init NS_UNAVAILABLE; 41 | 42 | /*! Initialise the object to ping the specified host. 43 | * \param hostName The DNS name of the host to ping; an IPv4 or IPv6 address in string form will 44 | * work here. 45 | * \returns The initialised object. 46 | */ 47 | 48 | - (instancetype)initWithHostName:(NSString *)hostName NS_DESIGNATED_INITIALIZER; 49 | 50 | /*! A copy of the value passed to `-initWithHostName:`. 51 | */ 52 | 53 | @property (nonatomic, copy, readonly) NSString * hostName; 54 | 55 | /*! The delegate for this object. 56 | * \details Delegate callbacks are schedule in the default run loop mode of the run loop of the 57 | * thread that calls `-start`. 58 | */ 59 | 60 | @property (nonatomic, weak, readwrite, nullable) id delegate; 61 | 62 | /*! Controls the IP address version used by the object. 63 | * \details You should set this value before starting the object. 64 | */ 65 | 66 | @property (nonatomic, assign, readwrite) SimplePingAddressStyle addressStyle; 67 | 68 | /*! The address being pinged. 69 | * \details The contents of the NSData is a (struct sockaddr) of some form. The 70 | * value is nil while the object is stopped and remains nil on start until 71 | * `-simplePing:didStartWithAddress:` is called. 72 | */ 73 | 74 | @property (nonatomic, copy, readonly, nullable) NSData * hostAddress; 75 | 76 | /*! The address family for `hostAddress`, or `AF_UNSPEC` if that's nil. 77 | */ 78 | 79 | @property (nonatomic, assign, readonly) sa_family_t hostAddressFamily; 80 | 81 | /*! The identifier used by pings by this object. 82 | * \details When you create an instance of this object it generates a random identifier 83 | * that it uses to identify its own pings. 84 | */ 85 | 86 | @property (nonatomic, assign, readonly) uint16_t identifier; 87 | 88 | /*! The next sequence number to be used by this object. 89 | * \details This value starts at zero and increments each time you send a ping (safely 90 | * wrapping back to zero if necessary). The sequence number is included in the ping, 91 | * allowing you to match up requests and responses, and thus calculate ping times and 92 | * so on. 93 | */ 94 | 95 | @property (nonatomic, assign, readonly) uint16_t nextSequenceNumber; 96 | 97 | /*! Starts the object. 98 | * \details You should set up the delegate and any ping parameters before calling this. 99 | * 100 | * If things go well you'll soon get the `-simplePing:didStartWithAddress:` delegate 101 | * callback, at which point you can start sending pings (via `-sendPingWithData:`) and 102 | * will start receiving ICMP packets (either ping responses, via the 103 | * `-simplePing:didReceivePingResponsePacket:sequenceNumber:` delegate callback, or 104 | * unsolicited ICMP packets, via the `-simplePing:didReceiveUnexpectedPacket:` delegate 105 | * callback). 106 | * 107 | * If the object fails to start, typically because `hostName` doesn't resolve, you'll get 108 | * the `-simplePing:didFailWithError:` delegate callback. 109 | * 110 | * It is not correct to start an already started object. 111 | */ 112 | 113 | - (void)start; 114 | 115 | /*! Sends a ping packet containing the specified data. 116 | * \details Sends an actual ping. 117 | * 118 | * The object must be started when you call this method and, on starting the object, you must 119 | * wait for the `-simplePing:didStartWithAddress:` delegate callback before calling it. 120 | * \param data Some data to include in the ping packet, after the ICMP header, or nil if you 121 | * want the packet to include a standard 56 byte payload (resulting in a standard 64 byte 122 | * ping). 123 | */ 124 | 125 | - (void)sendPingWithData:(nullable NSData *)data; 126 | 127 | /*! Stops the object. 128 | * \details You should call this when you're done pinging. 129 | * 130 | * It's safe to call this on an object that's stopped. 131 | */ 132 | 133 | - (void)stop; 134 | 135 | @end 136 | 137 | /*! A delegate protocol for the SimplePing class. 138 | */ 139 | 140 | @protocol SimplePingDelegate 141 | 142 | @optional 143 | 144 | /*! A SimplePing delegate callback, called once the object has started up. 145 | * \details This is called shortly after you start the object to tell you that the 146 | * object has successfully started. On receiving this callback, you can call 147 | * `-sendPingWithData:` to send pings. 148 | * 149 | * If the object didn't start, `-simplePing:didFailWithError:` is called instead. 150 | * \param pinger The object issuing the callback. 151 | * \param address The address that's being pinged; at the time this delegate callback 152 | * is made, this will have the same value as the `hostAddress` property. 153 | */ 154 | 155 | - (void)simplePing:(SimplePing *)pinger didStartWithAddress:(NSData *)address; 156 | 157 | /*! A SimplePing delegate callback, called if the object fails to start up. 158 | * \details This is called shortly after you start the object to tell you that the 159 | * object has failed to start. The most likely cause of failure is a problem 160 | * resolving `hostName`. 161 | * 162 | * By the time this callback is called, the object has stopped (that is, you don't 163 | * need to call `-stop` yourself). 164 | * \param pinger The object issuing the callback. 165 | * \param error Describes the failure. 166 | */ 167 | 168 | - (void)simplePing:(SimplePing *)pinger didFailWithError:(NSError *)error; 169 | 170 | /*! A SimplePing delegate callback, called when the object has successfully sent a ping packet. 171 | * \details Each call to `-sendPingWithData:` will result in either a 172 | * `-simplePing:didSendPacket:sequenceNumber:` delegate callback or a 173 | * `-simplePing:didFailToSendPacket:sequenceNumber:error:` delegate callback (unless you 174 | * stop the object before you get the callback). These callbacks are currently delivered 175 | * synchronously from within `-sendPingWithData:`, but this synchronous behaviour is not 176 | * considered API. 177 | * \param pinger The object issuing the callback. 178 | * \param packet The packet that was sent; this includes the ICMP header (`ICMPHeader`) and the 179 | * data you passed to `-sendPingWithData:` but does not include any IP-level headers. 180 | * \param sequenceNumber The ICMP sequence number of that packet. 181 | */ 182 | 183 | - (void)simplePing:(SimplePing *)pinger didSendPacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber; 184 | 185 | /*! A SimplePing delegate callback, called when the object fails to send a ping packet. 186 | * \details Each call to `-sendPingWithData:` will result in either a 187 | * `-simplePing:didSendPacket:sequenceNumber:` delegate callback or a 188 | * `-simplePing:didFailToSendPacket:sequenceNumber:error:` delegate callback (unless you 189 | * stop the object before you get the callback). These callbacks are currently delivered 190 | * synchronously from within `-sendPingWithData:`, but this synchronous behaviour is not 191 | * considered API. 192 | * \param pinger The object issuing the callback. 193 | * \param packet The packet that was not sent; see `-simplePing:didSendPacket:sequenceNumber:` 194 | * for details. 195 | * \param sequenceNumber The ICMP sequence number of that packet. 196 | * \param error Describes the failure. 197 | */ 198 | 199 | - (void)simplePing:(SimplePing *)pinger didFailToSendPacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber error:(NSError *)error; 200 | 201 | /*! A SimplePing delegate callback, called when the object receives a ping response. 202 | * \details If the object receives an ping response that matches a ping request that it 203 | * sent, it informs the delegate via this callback. Matching is primarily done based on 204 | * the ICMP identifier, although other criteria are used as well. 205 | * \param pinger The object issuing the callback. 206 | * \param packet The packet received; this includes the ICMP header (`ICMPHeader`) and any data that 207 | * follows that in the ICMP message but does not include any IP-level headers. 208 | * \param sequenceNumber The ICMP sequence number of that packet. 209 | */ 210 | 211 | - (void)simplePing:(SimplePing *)pinger didReceivePingResponsePacket:(NSData *)packet sequenceNumber:(uint16_t)sequenceNumber; 212 | 213 | /*! A SimplePing delegate callback, called when the object receives an unmatched ICMP message. 214 | * \details If the object receives an ICMP message that does not match a ping request that it 215 | * sent, it informs the delegate via this callback. The nature of ICMP handling in a 216 | * BSD kernel makes this a common event because, when an ICMP message arrives, it is 217 | * delivered to all ICMP sockets. 218 | * 219 | * IMPORTANT: This callback is especially common when using IPv6 because IPv6 uses ICMP 220 | * for important network management functions. For example, IPv6 routers periodically 221 | * send out Router Advertisement (RA) packets via Neighbor Discovery Protocol (NDP), which 222 | * is implemented on top of ICMP. 223 | * 224 | * For more on matching, see the discussion associated with 225 | * `-simplePing:didReceivePingResponsePacket:sequenceNumber:`. 226 | * \param pinger The object issuing the callback. 227 | * \param packet The packet received; this includes the ICMP header (`ICMPHeader`) and any data that 228 | * follows that in the ICMP message but does not include any IP-level headers. 229 | */ 230 | 231 | - (void)simplePing:(SimplePing *)pinger didReceiveUnexpectedPacket:(NSData *)packet; 232 | 233 | @end 234 | 235 | #pragma mark * ICMP On-The-Wire Format 236 | 237 | /*! Describes the on-the-wire header format for an ICMP ping. 238 | * \details This defines the header structure of ping packets on the wire. Both IPv4 and 239 | * IPv6 use the same basic structure. 240 | * 241 | * This is declared in the header because clients of SimplePing might want to use 242 | * it parse received ping packets. 243 | */ 244 | 245 | struct ICMPHeader { 246 | uint8_t type; 247 | uint8_t code; 248 | uint16_t checksum; 249 | uint16_t identifier; 250 | uint16_t sequenceNumber; 251 | // data... 252 | }; 253 | typedef struct ICMPHeader ICMPHeader; 254 | 255 | __Check_Compile_Time(sizeof(ICMPHeader) == 8); 256 | __Check_Compile_Time(offsetof(ICMPHeader, type) == 0); 257 | __Check_Compile_Time(offsetof(ICMPHeader, code) == 1); 258 | __Check_Compile_Time(offsetof(ICMPHeader, checksum) == 2); 259 | __Check_Compile_Time(offsetof(ICMPHeader, identifier) == 4); 260 | __Check_Compile_Time(offsetof(ICMPHeader, sequenceNumber) == 6); 261 | 262 | enum { 263 | ICMPv4TypeEchoRequest = 8, ///< The ICMP `type` for a ping request; in this case `code` is always 0. 264 | ICMPv4TypeEchoReply = 0 ///< The ICMP `type` for a ping response; in this case `code` is always 0. 265 | }; 266 | 267 | enum { 268 | ICMPv6TypeEchoRequest = 128, ///< The ICMP `type` for a ping request; in this case `code` is always 0. 269 | ICMPv6TypeEchoReply = 129 ///< The ICMP `type` for a ping response; in this case `code` is always 0. 270 | }; 271 | 272 | NS_ASSUME_NONNULL_END 273 | -------------------------------------------------------------------------------- /DYReachability/DYReachability.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 50; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | F445FCAA2137C7AA003EBEDF /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = F445FCA92137C7AA003EBEDF /* AppDelegate.m */; }; 11 | F445FCAD2137C7AA003EBEDF /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = F445FCAC2137C7AA003EBEDF /* ViewController.m */; }; 12 | F445FCB02137C7AA003EBEDF /* Main.storyboard in Resources */ = {isa = PBXBuildFile; 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343 | defaultConfigurationName = Release; 344 | }; 345 | F445FCBB2137C7B7003EBEDF /* Build configuration list for PBXNativeTarget "DYReachability" */ = { 346 | isa = XCConfigurationList; 347 | buildConfigurations = ( 348 | F445FCBC2137C7B7003EBEDF /* Debug */, 349 | F445FCBD2137C7B7003EBEDF /* Release */, 350 | ); 351 | defaultConfigurationIsVisible = 0; 352 | defaultConfigurationName = Release; 353 | }; 354 | /* End XCConfigurationList section */ 355 | }; 356 | rootObject = F445FC9D2137C7AA003EBEDF /* Project object */; 357 | } 358 | -------------------------------------------------------------------------------- /DYReachability/DYReachability/SimplePing.m: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (C) 2016 Apple Inc. All Rights Reserved. 3 | See LICENSE.txt for this sample’s licensing information 4 | 5 | Abstract: 6 | An object wrapper around the low-level BSD Sockets ping function. 7 | */ 8 | 9 | #import "SimplePing.h" 10 | 11 | #include 12 | #include 13 | #include 14 | 15 | #pragma mark * IPv4 and ICMPv4 On-The-Wire Format 16 | 17 | /*! Describes the on-the-wire header format for an IPv4 packet. 18 | * \details This defines the header structure of IPv4 packets on the wire. We need 19 | * this in order to skip this header in the IPv4 case, where the kernel passes 20 | * it to us for no obvious reason. 21 | */ 22 | 23 | struct IPv4Header { 24 | uint8_t versionAndHeaderLength; 25 | uint8_t differentiatedServices; 26 | uint16_t totalLength; 27 | uint16_t identification; 28 | uint16_t flagsAndFragmentOffset; 29 | uint8_t timeToLive; 30 | uint8_t protocol; 31 | uint16_t headerChecksum; 32 | uint8_t sourceAddress[4]; 33 | uint8_t destinationAddress[4]; 34 | // options... 35 | // data... 36 | }; 37 | typedef struct IPv4Header IPv4Header; 38 | 39 | __Check_Compile_Time(sizeof(IPv4Header) == 20); 40 | __Check_Compile_Time(offsetof(IPv4Header, versionAndHeaderLength) == 0); 41 | __Check_Compile_Time(offsetof(IPv4Header, differentiatedServices) == 1); 42 | __Check_Compile_Time(offsetof(IPv4Header, totalLength) == 2); 43 | __Check_Compile_Time(offsetof(IPv4Header, identification) == 4); 44 | __Check_Compile_Time(offsetof(IPv4Header, flagsAndFragmentOffset) == 6); 45 | __Check_Compile_Time(offsetof(IPv4Header, timeToLive) == 8); 46 | __Check_Compile_Time(offsetof(IPv4Header, protocol) == 9); 47 | __Check_Compile_Time(offsetof(IPv4Header, headerChecksum) == 10); 48 | __Check_Compile_Time(offsetof(IPv4Header, sourceAddress) == 12); 49 | __Check_Compile_Time(offsetof(IPv4Header, destinationAddress) == 16); 50 | 51 | /*! Calculates an IP checksum. 52 | * \details This is the standard BSD checksum code, modified to use modern types. 53 | * \param buffer A pointer to the data to checksum. 54 | * \param bufferLen The length of that data. 55 | * \returns The checksum value, in network byte order. 56 | */ 57 | 58 | static uint16_t in_cksum(const void *buffer, size_t bufferLen) { 59 | // 60 | size_t bytesLeft; 61 | int32_t sum; 62 | const uint16_t * cursor; 63 | union { 64 | uint16_t us; 65 | uint8_t uc[2]; 66 | } last; 67 | uint16_t answer; 68 | 69 | bytesLeft = bufferLen; 70 | sum = 0; 71 | cursor = buffer; 72 | 73 | /* 74 | * Our algorithm is simple, using a 32 bit accumulator (sum), we add 75 | * sequential 16 bit words to it, and at the end, fold back all the 76 | * carry bits from the top 16 bits into the lower 16 bits. 77 | */ 78 | while (bytesLeft > 1) { 79 | sum += *cursor; 80 | cursor += 1; 81 | bytesLeft -= 2; 82 | } 83 | 84 | /* mop up an odd byte, if necessary */ 85 | if (bytesLeft == 1) { 86 | last.uc[0] = * (const uint8_t *) cursor; 87 | last.uc[1] = 0; 88 | sum += last.us; 89 | } 90 | 91 | /* add back carry outs from top 16 bits to low 16 bits */ 92 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 93 | sum += (sum >> 16); /* add carry */ 94 | answer = (uint16_t) ~sum; /* truncate to 16 bits */ 95 | 96 | return answer; 97 | } 98 | 99 | #pragma mark * SimplePing 100 | 101 | @interface SimplePing () 102 | 103 | // read/write versions of public properties 104 | 105 | @property (nonatomic, copy, readwrite, nullable) NSData * hostAddress; 106 | @property (nonatomic, assign, readwrite ) uint16_t nextSequenceNumber; 107 | 108 | // private properties 109 | 110 | /*! True if nextSequenceNumber has wrapped from 65535 to 0. 111 | */ 112 | 113 | @property (nonatomic, assign, readwrite) BOOL nextSequenceNumberHasWrapped; 114 | 115 | /*! A host object for name-to-address resolution. 116 | */ 117 | 118 | @property (nonatomic, strong, readwrite, nullable) CFHostRef host __attribute__ ((NSObject)); 119 | 120 | /*! A socket object for ICMP send and receive. 121 | */ 122 | 123 | @property (nonatomic, strong, readwrite, nullable) CFSocketRef socket __attribute__ ((NSObject)); 124 | 125 | @end 126 | 127 | @implementation SimplePing 128 | 129 | - (instancetype)initWithHostName:(NSString *)hostName { 130 | NSParameterAssert(hostName != nil); 131 | self = [super init]; 132 | if (self != nil) { 133 | self->_hostName = [hostName copy]; 134 | self->_identifier = (uint16_t) arc4random(); 135 | } 136 | return self; 137 | } 138 | 139 | - (void)dealloc { 140 | [self stop]; 141 | // Double check that -stop took care of _host and _socket. 142 | assert(self->_host == NULL); 143 | assert(self->_socket == NULL); 144 | } 145 | 146 | - (sa_family_t)hostAddressFamily { 147 | sa_family_t result; 148 | 149 | result = AF_UNSPEC; 150 | if ( (self.hostAddress != nil) && (self.hostAddress.length >= sizeof(struct sockaddr)) ) { 151 | result = ((const struct sockaddr *) self.hostAddress.bytes)->sa_family; 152 | } 153 | return result; 154 | } 155 | 156 | /*! Shuts down the pinger object and tell the delegate about the error. 157 | * \param error Describes the failure. 158 | */ 159 | 160 | - (void)didFailWithError:(NSError *)error { 161 | id strongDelegate; 162 | 163 | assert(error != nil); 164 | 165 | // We retain ourselves temporarily because it's common for the delegate method 166 | // to release its last reference to us, which causes -dealloc to be called here. 167 | // If we then reference self on the return path, things go badly. I don't think 168 | // that happens currently, but I've got into the habit of doing this as a 169 | // defensive measure. 170 | 171 | CFAutorelease( CFBridgingRetain( self )); 172 | 173 | [self stop]; 174 | strongDelegate = self.delegate; 175 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didFailWithError:)] ) { 176 | [strongDelegate simplePing:self didFailWithError:error]; 177 | } 178 | } 179 | 180 | /*! Shuts down the pinger object and tell the delegate about the error. 181 | * \details This converts the CFStreamError to an NSError and then call through to 182 | * -didFailWithError: to do the real work. 183 | * \param streamError Describes the failure. 184 | */ 185 | 186 | - (void)didFailWithHostStreamError:(CFStreamError)streamError { 187 | NSDictionary * userInfo; 188 | NSError * error; 189 | 190 | if (streamError.domain == kCFStreamErrorDomainNetDB) { 191 | userInfo = @{(id) kCFGetAddrInfoFailureKey: @(streamError.error)}; 192 | } else { 193 | userInfo = nil; 194 | } 195 | error = [NSError errorWithDomain:(NSString *) kCFErrorDomainCFNetwork code:kCFHostErrorUnknown userInfo:userInfo]; 196 | 197 | [self didFailWithError:error]; 198 | } 199 | 200 | /*! Builds a ping packet from the supplied parameters. 201 | * \param type The packet type, which is different for IPv4 and IPv6. 202 | * \param payload Data to place after the ICMP header. 203 | * \param requiresChecksum Determines whether a checksum is calculated (IPv4) or not (IPv6). 204 | * \returns A ping packet suitable to be passed to the kernel. 205 | */ 206 | 207 | - (NSData *)pingPacketWithType:(uint8_t)type payload:(NSData *)payload requiresChecksum:(BOOL)requiresChecksum { 208 | NSMutableData * packet; 209 | ICMPHeader * icmpPtr; 210 | 211 | packet = [NSMutableData dataWithLength:sizeof(*icmpPtr) + payload.length]; 212 | assert(packet != nil); 213 | 214 | icmpPtr = packet.mutableBytes; 215 | icmpPtr->type = type; 216 | icmpPtr->code = 0; 217 | icmpPtr->checksum = 0; 218 | icmpPtr->identifier = OSSwapHostToBigInt16(self.identifier); 219 | icmpPtr->sequenceNumber = OSSwapHostToBigInt16(self.nextSequenceNumber); 220 | memcpy(&icmpPtr[1], [payload bytes], [payload length]); 221 | 222 | if (requiresChecksum) { 223 | // The IP checksum routine returns a 16-bit number that's already in correct byte order 224 | // (due to wacky 1's complement maths), so we just put it into the packet as a 16-bit unit. 225 | 226 | icmpPtr->checksum = in_cksum(packet.bytes, packet.length); 227 | } 228 | 229 | return packet; 230 | } 231 | 232 | - (void)sendPingWithData:(NSData *)data { 233 | int err; 234 | NSData * payload; 235 | NSData * packet; 236 | ssize_t bytesSent; 237 | id strongDelegate; 238 | 239 | // data may be nil 240 | NSParameterAssert(self.hostAddress != nil); // gotta wait for -simplePing:didStartWithAddress: 241 | 242 | // Construct the ping packet. 243 | 244 | payload = data; 245 | if (payload == nil) { 246 | payload = [[NSString stringWithFormat:@"%28zd bottles of beer on the wall", (ssize_t) 99 - (size_t) (self.nextSequenceNumber % 100) ] dataUsingEncoding:NSASCIIStringEncoding]; 247 | assert(payload != nil); 248 | 249 | // Our dummy payload is sized so that the resulting ICMP packet, including the ICMPHeader, is 250 | // 64-bytes, which makes it easier to recognise our packets on the wire. 251 | 252 | assert([payload length] == 56); 253 | } 254 | 255 | switch (self.hostAddressFamily) { 256 | case AF_INET: { 257 | packet = [self pingPacketWithType:ICMPv4TypeEchoRequest payload:payload requiresChecksum:YES]; 258 | } break; 259 | case AF_INET6: { 260 | packet = [self pingPacketWithType:ICMPv6TypeEchoRequest payload:payload requiresChecksum:NO]; 261 | } break; 262 | default: { 263 | assert(NO); 264 | } break; 265 | } 266 | assert(packet != nil); 267 | 268 | // Send the packet. 269 | 270 | if (self.socket == NULL) { 271 | bytesSent = -1; 272 | err = EBADF; 273 | } else { 274 | bytesSent = sendto( 275 | CFSocketGetNative(self.socket), 276 | packet.bytes, 277 | packet.length, 278 | 0, 279 | self.hostAddress.bytes, 280 | (socklen_t) self.hostAddress.length 281 | ); 282 | err = 0; 283 | if (bytesSent < 0) { 284 | err = errno; 285 | } 286 | } 287 | 288 | // Handle the results of the send. 289 | 290 | strongDelegate = self.delegate; 291 | if ( (bytesSent > 0) && (((NSUInteger) bytesSent) == packet.length) ) { 292 | 293 | // Complete success. Tell the client. 294 | 295 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didSendPacket:sequenceNumber:)] ) { 296 | [strongDelegate simplePing:self didSendPacket:packet sequenceNumber:self.nextSequenceNumber]; 297 | } 298 | } else { 299 | NSError * error; 300 | 301 | // Some sort of failure. Tell the client. 302 | 303 | if (err == 0) { 304 | err = ENOBUFS; // This is not a hugely descriptor error, alas. 305 | } 306 | error = [NSError errorWithDomain:NSPOSIXErrorDomain code:err userInfo:nil]; 307 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didFailToSendPacket:sequenceNumber:error:)] ) { 308 | [strongDelegate simplePing:self didFailToSendPacket:packet sequenceNumber:self.nextSequenceNumber error:error]; 309 | } 310 | } 311 | 312 | self.nextSequenceNumber += 1; 313 | if (self.nextSequenceNumber == 0) { 314 | self.nextSequenceNumberHasWrapped = YES; 315 | } 316 | } 317 | 318 | /*! Calculates the offset of the ICMP header within an IPv4 packet. 319 | * \details In the IPv4 case the kernel returns us a buffer that includes the 320 | * IPv4 header. We're not interested in that, so we have to skip over it. 321 | * This code does a rough check of the IPv4 header and, if it looks OK, 322 | * returns the offset of the ICMP header. 323 | * \param packet The IPv4 packet, as returned to us by the kernel. 324 | * \returns The offset of the ICMP header, or NSNotFound. 325 | */ 326 | 327 | + (NSUInteger)icmpHeaderOffsetInIPv4Packet:(NSData *)packet { 328 | // Returns the offset of the ICMPv4Header within an IP packet. 329 | NSUInteger result; 330 | const struct IPv4Header * ipPtr; 331 | size_t ipHeaderLength; 332 | 333 | result = NSNotFound; 334 | if (packet.length >= (sizeof(IPv4Header) + sizeof(ICMPHeader))) { 335 | ipPtr = (const IPv4Header *) packet.bytes; 336 | if ( ((ipPtr->versionAndHeaderLength & 0xF0) == 0x40) && // IPv4 337 | ( ipPtr->protocol == IPPROTO_ICMP ) ) { 338 | ipHeaderLength = (ipPtr->versionAndHeaderLength & 0x0F) * sizeof(uint32_t); 339 | if (packet.length >= (ipHeaderLength + sizeof(ICMPHeader))) { 340 | result = ipHeaderLength; 341 | } 342 | } 343 | } 344 | return result; 345 | } 346 | 347 | /*! Checks whether the specified sequence number is one we sent. 348 | * \param sequenceNumber The incoming sequence number. 349 | * \returns YES if the sequence number looks like one we sent. 350 | */ 351 | 352 | - (BOOL)validateSequenceNumber:(uint16_t)sequenceNumber { 353 | if (self.nextSequenceNumberHasWrapped) { 354 | // If the sequence numbers have wrapped that we can't reliably check 355 | // whether this is a sequence number we sent. Rather, we check to see 356 | // whether the sequence number is within the last 120 sequence numbers 357 | // we sent. Note that the uint16_t subtraction here does the right 358 | // thing regardless of the wrapping. 359 | // 360 | // Why 120? Well, if we send one ping per second, 120 is 2 minutes, which 361 | // is the standard "max time a packet can bounce around the Internet" value. 362 | return ((uint16_t) (self.nextSequenceNumber - sequenceNumber)) < (uint16_t) 120; 363 | } else { 364 | return sequenceNumber < self.nextSequenceNumber; 365 | } 366 | } 367 | 368 | /*! Checks whether an incoming IPv4 packet looks like a ping response. 369 | * \details This routine modifies this `packet` data! It does this for two reasons: 370 | * 371 | * * It needs to zero out the `checksum` field of the ICMPHeader in order to do 372 | * its checksum calculation. 373 | * 374 | * * It removes the IPv4 header from the front of the packet. 375 | * \param packet The IPv4 packet, as returned to us by the kernel. 376 | * \param sequenceNumberPtr A pointer to a place to start the ICMP sequence number. 377 | * \returns YES if the packet looks like a reasonable IPv4 ping response. 378 | */ 379 | 380 | - (BOOL)validatePing4ResponsePacket:(NSMutableData *)packet sequenceNumber:(uint16_t *)sequenceNumberPtr { 381 | BOOL result; 382 | NSUInteger icmpHeaderOffset; 383 | ICMPHeader * icmpPtr; 384 | uint16_t receivedChecksum; 385 | uint16_t calculatedChecksum; 386 | 387 | result = NO; 388 | 389 | icmpHeaderOffset = [[self class] icmpHeaderOffsetInIPv4Packet:packet]; 390 | if (icmpHeaderOffset != NSNotFound) { 391 | icmpPtr = (struct ICMPHeader *) (((uint8_t *) packet.mutableBytes) + icmpHeaderOffset); 392 | 393 | receivedChecksum = icmpPtr->checksum; 394 | icmpPtr->checksum = 0; 395 | calculatedChecksum = in_cksum(icmpPtr, packet.length - icmpHeaderOffset); 396 | icmpPtr->checksum = receivedChecksum; 397 | 398 | if (receivedChecksum == calculatedChecksum) { 399 | if ( (icmpPtr->type == ICMPv4TypeEchoReply) && (icmpPtr->code == 0) ) { 400 | if ( OSSwapBigToHostInt16(icmpPtr->identifier) == self.identifier ) { 401 | uint16_t sequenceNumber; 402 | 403 | sequenceNumber = OSSwapBigToHostInt16(icmpPtr->sequenceNumber); 404 | if ([self validateSequenceNumber:sequenceNumber]) { 405 | 406 | // Remove the IPv4 header off the front of the data we received, leaving us with 407 | // just the ICMP header and the ping payload. 408 | [packet replaceBytesInRange:NSMakeRange(0, icmpHeaderOffset) withBytes:NULL length:0]; 409 | 410 | *sequenceNumberPtr = sequenceNumber; 411 | result = YES; 412 | } 413 | } 414 | } 415 | } 416 | } 417 | 418 | return result; 419 | } 420 | 421 | /*! Checks whether an incoming IPv6 packet looks like a ping response. 422 | * \param packet The IPv6 packet, as returned to us by the kernel; note that this routine 423 | * could modify this data but does not need to in the IPv6 case. 424 | * \param sequenceNumberPtr A pointer to a place to start the ICMP sequence number. 425 | * \returns YES if the packet looks like a reasonable IPv4 ping response. 426 | */ 427 | 428 | - (BOOL)validatePing6ResponsePacket:(NSMutableData *)packet sequenceNumber:(uint16_t *)sequenceNumberPtr { 429 | BOOL result; 430 | const ICMPHeader * icmpPtr; 431 | 432 | result = NO; 433 | 434 | if (packet.length >= sizeof(*icmpPtr)) { 435 | icmpPtr = packet.bytes; 436 | 437 | // In the IPv6 case we don't check the checksum because that's hard (we need to 438 | // cook up an IPv6 pseudo header and we don't have the ingredients) and unnecessary 439 | // (the kernel has already done this check). 440 | 441 | if ( (icmpPtr->type == ICMPv6TypeEchoReply) && (icmpPtr->code == 0) ) { 442 | if ( OSSwapBigToHostInt16(icmpPtr->identifier) == self.identifier ) { 443 | uint16_t sequenceNumber; 444 | 445 | sequenceNumber = OSSwapBigToHostInt16(icmpPtr->sequenceNumber); 446 | if ([self validateSequenceNumber:sequenceNumber]) { 447 | *sequenceNumberPtr = sequenceNumber; 448 | result = YES; 449 | } 450 | } 451 | } 452 | } 453 | return result; 454 | } 455 | 456 | /*! Checks whether an incoming packet looks like a ping response. 457 | * \param packet The packet, as returned to us by the kernel; note that may end up modifying 458 | * this data. 459 | * \param sequenceNumberPtr A pointer to a place to start the ICMP sequence number. 460 | * \returns YES if the packet looks like a reasonable IPv4 ping response. 461 | */ 462 | 463 | - (BOOL)validatePingResponsePacket:(NSMutableData *)packet sequenceNumber:(uint16_t *)sequenceNumberPtr { 464 | BOOL result; 465 | 466 | switch (self.hostAddressFamily) { 467 | case AF_INET: { 468 | result = [self validatePing4ResponsePacket:packet sequenceNumber:sequenceNumberPtr]; 469 | } break; 470 | case AF_INET6: { 471 | result = [self validatePing6ResponsePacket:packet sequenceNumber:sequenceNumberPtr]; 472 | } break; 473 | default: { 474 | assert(NO); 475 | result = NO; 476 | } break; 477 | } 478 | return result; 479 | } 480 | 481 | /*! Reads data from the ICMP socket. 482 | * \details Called by the socket handling code (SocketReadCallback) to process an ICMP 483 | * message waiting on the socket. 484 | */ 485 | 486 | - (void)readData { 487 | int err; 488 | struct sockaddr_storage addr; 489 | socklen_t addrLen; 490 | ssize_t bytesRead; 491 | void * buffer; 492 | enum { kBufferSize = 65535 }; 493 | 494 | // 65535 is the maximum IP packet size, which seems like a reasonable bound 495 | // here (plus it's what uses). 496 | 497 | buffer = malloc(kBufferSize); 498 | assert(buffer != NULL); 499 | 500 | // Actually read the data. We use recvfrom(), and thus get back the source address, 501 | // but we don't actually do anything with it. It would be trivial to pass it to 502 | // the delegate but we don't need it in this example. 503 | 504 | addrLen = sizeof(addr); 505 | bytesRead = recvfrom(CFSocketGetNative(self.socket), buffer, kBufferSize, 0, (struct sockaddr *) &addr, &addrLen); 506 | err = 0; 507 | if (bytesRead < 0) { 508 | err = errno; 509 | } 510 | 511 | // Process the data we read. 512 | 513 | if (bytesRead > 0) { 514 | NSMutableData * packet; 515 | id strongDelegate; 516 | uint16_t sequenceNumber; 517 | 518 | packet = [NSMutableData dataWithBytes:buffer length:(NSUInteger) bytesRead]; 519 | assert(packet != nil); 520 | 521 | // We got some data, pass it up to our client. 522 | 523 | strongDelegate = self.delegate; 524 | if ( [self validatePingResponsePacket:packet sequenceNumber:&sequenceNumber] ) { 525 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didReceivePingResponsePacket:sequenceNumber:)] ) { 526 | [strongDelegate simplePing:self didReceivePingResponsePacket:packet sequenceNumber:sequenceNumber]; 527 | } 528 | } else { 529 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didReceiveUnexpectedPacket:)] ) { 530 | [strongDelegate simplePing:self didReceiveUnexpectedPacket:packet]; 531 | } 532 | } 533 | } else { 534 | 535 | // We failed to read the data, so shut everything down. 536 | 537 | if (err == 0) { 538 | err = EPIPE; 539 | } 540 | [self didFailWithError:[NSError errorWithDomain:NSPOSIXErrorDomain code:err userInfo:nil]]; 541 | } 542 | 543 | free(buffer); 544 | 545 | // Note that we don't loop back trying to read more data. Rather, we just 546 | // let CFSocket call us again. 547 | } 548 | 549 | /*! The callback for our CFSocket object. 550 | * \details This simply routes the call to our `-readData` method. 551 | * \param s See the documentation for CFSocketCallBack. 552 | * \param type See the documentation for CFSocketCallBack. 553 | * \param address See the documentation for CFSocketCallBack. 554 | * \param data See the documentation for CFSocketCallBack. 555 | * \param info See the documentation for CFSocketCallBack; this is actually a pointer to the 556 | * 'owning' object. 557 | */ 558 | 559 | static void SocketReadCallback(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) { 560 | // This C routine is called by CFSocket when there's data waiting on our 561 | // ICMP socket. It just redirects the call to Objective-C code. 562 | SimplePing * obj; 563 | 564 | obj = (__bridge SimplePing *) info; 565 | assert([obj isKindOfClass:[SimplePing class]]); 566 | 567 | #pragma unused(s) 568 | assert(s == obj.socket); 569 | #pragma unused(type) 570 | assert(type == kCFSocketReadCallBack); 571 | #pragma unused(address) 572 | assert(address == nil); 573 | #pragma unused(data) 574 | assert(data == nil); 575 | 576 | [obj readData]; 577 | } 578 | 579 | /*! Starts the send and receive infrastructure. 580 | * \details This is called once we've successfully resolved `hostName` in to 581 | * `hostAddress`. It's responsible for setting up the socket for sending and 582 | * receiving pings. 583 | */ 584 | 585 | - (void)startWithHostAddress { 586 | int err; 587 | int fd; 588 | 589 | assert(self.hostAddress != nil); 590 | 591 | // Open the socket. 592 | 593 | fd = -1; 594 | err = 0; 595 | switch (self.hostAddressFamily) { 596 | case AF_INET: { 597 | fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP); 598 | if (fd < 0) { 599 | err = errno; 600 | } 601 | } break; 602 | case AF_INET6: { 603 | fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6); 604 | if (fd < 0) { 605 | err = errno; 606 | } 607 | } break; 608 | default: { 609 | err = EPROTONOSUPPORT; 610 | } break; 611 | } 612 | 613 | if (err != 0) { 614 | [self didFailWithError:[NSError errorWithDomain:NSPOSIXErrorDomain code:err userInfo:nil]]; 615 | } else { 616 | CFSocketContext context = {0, (__bridge void *)(self), NULL, NULL, NULL}; 617 | CFRunLoopSourceRef rls; 618 | id strongDelegate; 619 | 620 | // Wrap it in a CFSocket and schedule it on the runloop. 621 | 622 | self.socket = (CFSocketRef) CFAutorelease( CFSocketCreateWithNative(NULL, fd, kCFSocketReadCallBack, SocketReadCallback, &context) ); 623 | assert(self.socket != NULL); 624 | 625 | // The socket will now take care of cleaning up our file descriptor. 626 | 627 | assert( CFSocketGetSocketFlags(self.socket) & kCFSocketCloseOnInvalidate ); 628 | fd = -1; 629 | 630 | rls = CFSocketCreateRunLoopSource(NULL, self.socket, 0); 631 | assert(rls != NULL); 632 | 633 | CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode); 634 | 635 | CFRelease(rls); 636 | 637 | strongDelegate = self.delegate; 638 | if ( (strongDelegate != nil) && [strongDelegate respondsToSelector:@selector(simplePing:didStartWithAddress:)] ) { 639 | [strongDelegate simplePing:self didStartWithAddress:self.hostAddress]; 640 | } 641 | } 642 | assert(fd == -1); 643 | } 644 | 645 | /*! Processes the results of our name-to-address resolution. 646 | * \details Called by our CFHost resolution callback (HostResolveCallback) when host 647 | * resolution is complete. We just latch the first appropriate address and kick 648 | * off the send and receive infrastructure. 649 | */ 650 | 651 | - (void)hostResolutionDone { 652 | Boolean resolved; 653 | NSArray * addresses; 654 | 655 | // Find the first appropriate address. 656 | 657 | addresses = (__bridge NSArray *) CFHostGetAddressing(self.host, &resolved); 658 | if ( resolved && (addresses != nil) ) { 659 | resolved = false; 660 | for (NSData * address in addresses) { 661 | const struct sockaddr * addrPtr; 662 | 663 | addrPtr = (const struct sockaddr *) address.bytes; 664 | if ( address.length >= sizeof(struct sockaddr) ) { 665 | switch (addrPtr->sa_family) { 666 | case AF_INET: { 667 | if (self.addressStyle != SimplePingAddressStyleICMPv6) { 668 | self.hostAddress = address; 669 | resolved = true; 670 | } 671 | } break; 672 | case AF_INET6: { 673 | if (self.addressStyle != SimplePingAddressStyleICMPv4) { 674 | self.hostAddress = address; 675 | resolved = true; 676 | } 677 | } break; 678 | } 679 | } 680 | if (resolved) { 681 | break; 682 | } 683 | } 684 | } 685 | 686 | // We're done resolving, so shut that down. 687 | 688 | [self stopHostResolution]; 689 | 690 | // If all is OK, start the send and receive infrastructure, otherwise stop. 691 | 692 | if (resolved) { 693 | [self startWithHostAddress]; 694 | } else { 695 | [self didFailWithError:[NSError errorWithDomain:(NSString *)kCFErrorDomainCFNetwork code:kCFHostErrorHostNotFound userInfo:nil]]; 696 | } 697 | } 698 | 699 | /*! The callback for our CFHost object. 700 | * \details This simply routes the call to our `-hostResolutionDone` or 701 | * `-didFailWithHostStreamError:` methods. 702 | * \param theHost See the documentation for CFHostClientCallBack. 703 | * \param typeInfo See the documentation for CFHostClientCallBack. 704 | * \param error See the documentation for CFHostClientCallBack. 705 | * \param info See the documentation for CFHostClientCallBack; this is actually a pointer to 706 | * the 'owning' object. 707 | */ 708 | 709 | static void HostResolveCallback(CFHostRef theHost, CFHostInfoType typeInfo, const CFStreamError *error, void *info) { 710 | // This C routine is called by CFHost when the host resolution is complete. 711 | // It just redirects the call to the appropriate Objective-C method. 712 | SimplePing * obj; 713 | 714 | obj = (__bridge SimplePing *) info; 715 | assert([obj isKindOfClass:[SimplePing class]]); 716 | 717 | #pragma unused(theHost) 718 | assert(theHost == obj.host); 719 | #pragma unused(typeInfo) 720 | assert(typeInfo == kCFHostAddresses); 721 | 722 | if ( (error != NULL) && (error->domain != 0) ) { 723 | [obj didFailWithHostStreamError:*error]; 724 | } else { 725 | [obj hostResolutionDone]; 726 | } 727 | } 728 | 729 | - (void)start { 730 | Boolean success; 731 | CFHostClientContext context = {0, (__bridge void *)(self), NULL, NULL, NULL}; 732 | CFStreamError streamError; 733 | 734 | assert(self.host == NULL); 735 | assert(self.hostAddress == nil); 736 | 737 | self.host = (CFHostRef) CFAutorelease( CFHostCreateWithName(NULL, (__bridge CFStringRef) self.hostName) ); 738 | assert(self.host != NULL); 739 | 740 | CFHostSetClient(self.host, HostResolveCallback, &context); 741 | 742 | CFHostScheduleWithRunLoop(self.host, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); 743 | 744 | success = CFHostStartInfoResolution(self.host, kCFHostAddresses, &streamError); 745 | if ( ! success ) { 746 | [self didFailWithHostStreamError:streamError]; 747 | } 748 | } 749 | 750 | /*! Stops the name-to-address resolution infrastructure. 751 | */ 752 | 753 | - (void)stopHostResolution { 754 | // Shut down the CFHost. 755 | if (self.host != NULL) { 756 | CFHostSetClient(self.host, NULL, NULL); 757 | CFHostUnscheduleFromRunLoop(self.host, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); 758 | self.host = NULL; 759 | } 760 | } 761 | 762 | /*! Stops the send and receive infrastructure. 763 | */ 764 | 765 | - (void)stopSocket { 766 | if (self.socket != NULL) { 767 | CFSocketInvalidate(self.socket); 768 | self.socket = NULL; 769 | } 770 | } 771 | 772 | - (void)stop { 773 | [self stopHostResolution]; 774 | [self stopSocket]; 775 | 776 | // Junk the host address on stop. If the client calls -start again, we'll 777 | // re-resolve the host name. 778 | 779 | self.hostAddress = NULL; 780 | } 781 | 782 | @end 783 | --------------------------------------------------------------------------------