Abhishek Banthia
9 years ago
14 changed files with 775 additions and 275 deletions
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/*
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Copyright (C) 2015 Apple Inc. All Rights Reserved. |
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See LICENSE.txt for this sample’s licensing information |
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Abstract: |
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Basic demonstration of how to use the SystemConfiguration Reachablity APIs. |
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*/ |
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#import <Foundation/Foundation.h> |
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#import <SystemConfiguration/SystemConfiguration.h> |
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#import <netinet/in.h> |
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typedef enum : NSInteger { |
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NotReachable = 0, |
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ReachableViaWiFi, |
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ReachableViaWWAN |
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} NetworkStatus; |
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extern NSString *kReachabilityChangedNotification; |
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@interface Reachability : NSObject |
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/*!
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* Use to check the reachability of a given host name. |
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*/ |
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+ (instancetype)reachabilityWithHostName:(NSString *)hostName; |
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/*!
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* Use to check the reachability of a given IP address. |
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*/ |
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+ (instancetype)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress; |
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/*!
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* Checks whether the default route is available. Should be used by applications that do not connect to a particular host. |
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*/ |
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+ (instancetype)reachabilityForInternetConnection; |
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/*!
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* Checks whether a local WiFi connection is available. |
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*/ |
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+ (instancetype)reachabilityForLocalWiFi; |
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/*!
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* Start listening for reachability notifications on the current run loop. |
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*/ |
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- (BOOL)startNotifier; |
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- (void)stopNotifier; |
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- (NetworkStatus)currentReachabilityStatus; |
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/*!
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* WWAN may be available, but not active until a connection has been established. WiFi may require a connection for VPN on Demand. |
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*/ |
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- (BOOL)connectionRequired; |
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@end |
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@ -0,0 +1,269 @@ |
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/* |
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Copyright (C) 2015 Apple Inc. All Rights Reserved. |
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See LICENSE.txt for this sample’s licensing information |
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Abstract: |
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Basic demonstration of how to use the SystemConfiguration Reachablity APIs. |
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*/ |
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#import <arpa/inet.h> |
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#import <ifaddrs.h> |
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#import <netdb.h> |
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#import <sys/socket.h> |
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#import <CoreFoundation/CoreFoundation.h> |
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#import "Reachability.h" |
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NSString *kReachabilityChangedNotification = @"kNetworkReachabilityChangedNotification"; |
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#pragma mark - Supporting functions |
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#define kShouldPrintReachabilityFlags 1 |
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static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment) |
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{ |
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#if kShouldPrintReachabilityFlags |
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NSLog(@"Reachability Flag Status: %c %c%c%c%c%c%c%c %s\n", |
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(flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-', |
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(flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-', |
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(flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-', |
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(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-', |
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(flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-', |
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(flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-', |
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(flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-', |
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(flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-', |
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comment |
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); |
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#endif |
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} |
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static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) |
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{ |
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#pragma unused (target, flags) |
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NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback"); |
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NSCAssert([(__bridge NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback"); |
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Reachability* noteObject = (__bridge Reachability *)info; |
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// Post a notification to notify the client that the network reachability changed. |
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[[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: noteObject]; |
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} |
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#pragma mark - Reachability implementation |
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@implementation Reachability |
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{ |
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BOOL _alwaysReturnLocalWiFiStatus; //default is NO |
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SCNetworkReachabilityRef _reachabilityRef; |
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} |
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+ (instancetype)reachabilityWithHostName:(NSString *)hostName |
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{ |
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Reachability* returnValue = NULL; |
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SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]); |
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if (reachability != NULL) |
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{ |
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returnValue= [[self alloc] init]; |
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if (returnValue != NULL) |
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{ |
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returnValue->_reachabilityRef = reachability; |
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returnValue->_alwaysReturnLocalWiFiStatus = NO; |
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} |
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else { |
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CFRelease(reachability); |
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} |
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} |
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return returnValue; |
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} |
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+ (instancetype)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress |
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{ |
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SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)hostAddress); |
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Reachability* returnValue = NULL; |
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if (reachability != NULL) |
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{ |
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returnValue = [[self alloc] init]; |
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if (returnValue != NULL) |
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{ |
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returnValue->_reachabilityRef = reachability; |
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returnValue->_alwaysReturnLocalWiFiStatus = NO; |
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} |
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else { |
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CFRelease(reachability); |
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} |
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} |
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return returnValue; |
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} |
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+ (instancetype)reachabilityForInternetConnection |
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{ |
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struct sockaddr_in zeroAddress; |
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bzero(&zeroAddress, sizeof(zeroAddress)); |
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zeroAddress.sin_len = sizeof(zeroAddress); |
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zeroAddress.sin_family = AF_INET; |
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return [self reachabilityWithAddress:&zeroAddress]; |
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} |
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+ (instancetype)reachabilityForLocalWiFi |
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{ |
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struct sockaddr_in localWifiAddress; |
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bzero(&localWifiAddress, sizeof(localWifiAddress)); |
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localWifiAddress.sin_len = sizeof(localWifiAddress); |
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localWifiAddress.sin_family = AF_INET; |
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// IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0. |
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localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM); |
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Reachability* returnValue = [self reachabilityWithAddress: &localWifiAddress]; |
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if (returnValue != NULL) |
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{ |
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returnValue->_alwaysReturnLocalWiFiStatus = YES; |
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} |
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return returnValue; |
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} |
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#pragma mark - Start and stop notifier |
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- (BOOL)startNotifier |
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{ |
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BOOL returnValue = NO; |
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SCNetworkReachabilityContext context = {0, (__bridge void *)(self), NULL, NULL, NULL}; |
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if (SCNetworkReachabilitySetCallback(_reachabilityRef, ReachabilityCallback, &context)) |
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{ |
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if (SCNetworkReachabilityScheduleWithRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)) |
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{ |
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returnValue = YES; |
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} |
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} |
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return returnValue; |
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} |
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- (void)stopNotifier |
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{ |
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if (_reachabilityRef != NULL) |
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{ |
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SCNetworkReachabilityUnscheduleFromRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); |
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} |
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} |
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- (void)dealloc |
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{ |
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[self stopNotifier]; |
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if (_reachabilityRef != NULL) |
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{ |
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CFRelease(_reachabilityRef); |
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} |
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} |
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#pragma mark - Network Flag Handling |
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- (NetworkStatus)localWiFiStatusForFlags:(SCNetworkReachabilityFlags)flags |
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{ |
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PrintReachabilityFlags(flags, "localWiFiStatusForFlags"); |
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NetworkStatus returnValue = NotReachable; |
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if ((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect)) |
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{ |
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returnValue = ReachableViaWiFi; |
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} |
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return returnValue; |
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} |
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- (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags |
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{ |
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PrintReachabilityFlags(flags, "networkStatusForFlags"); |
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if ((flags & kSCNetworkReachabilityFlagsReachable) == 0) |
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{ |
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// The target host is not reachable. |
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return NotReachable; |
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} |
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NetworkStatus returnValue = NotReachable; |
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if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0) |
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{ |
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/* |
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If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi... |
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*/ |
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returnValue = ReachableViaWiFi; |
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} |
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if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) || |
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(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0)) |
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{ |
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/* |
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... and the connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs... |
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*/ |
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if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0) |
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{ |
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/* |
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... and no [user] intervention is needed... |
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*/ |
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returnValue = ReachableViaWiFi; |
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} |
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} |
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return returnValue; |
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} |
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- (BOOL)connectionRequired |
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{ |
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NSAssert(_reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef"); |
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SCNetworkReachabilityFlags flags; |
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if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)) |
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{ |
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return (flags & kSCNetworkReachabilityFlagsConnectionRequired); |
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} |
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return NO; |
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} |
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- (NetworkStatus)currentReachabilityStatus |
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{ |
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NSAssert(_reachabilityRef != NULL, @"currentNetworkStatus called with NULL SCNetworkReachabilityRef"); |
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NetworkStatus returnValue = NotReachable; |
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SCNetworkReachabilityFlags flags; |
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if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags)) |
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{ |
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if (_alwaysReturnLocalWiFiStatus) |
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{ |
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returnValue = [self localWiFiStatusForFlags:flags]; |
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} |
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else |
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{ |
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returnValue = [self networkStatusForFlags:flags]; |
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} |
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} |
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return returnValue; |
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} |
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@end |
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