/* File: Reachability.m Abstract: Basic demonstration of how to use the SystemConfiguration Reachablity APIs. Version: 2.2 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc. ("Apple") in consideration of your agreement to the following terms, and your use, installation, modification or redistribution of this Apple software constitutes acceptance of these terms. If you do not agree with these terms, please do not use, install, modify or redistribute this Apple software. 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Except as expressly stated in this notice, no other rights or licenses, express or implied, are granted by Apple herein, including but not limited to any patent rights that may be infringed by your derivative works or by other works in which the Apple Software may be incorporated. The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Copyright (C) 2010 Apple Inc. All Rights Reserved. */ #import #import #import #import #import #import #import #import "Reachability.h" #define kShouldPrintReachabilityFlags 1 static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char *comment) { #if kShouldPrintReachabilityFlags NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n", (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-', (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-', (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-', (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-', (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-', (flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-', (flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-', comment); #endif } @implementation Reachability static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void *info) { #pragma unused(target, flags) NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback"); NSCAssert([(NSObject *)info isKindOfClass:[Reachability class]], @"info was wrong class in ReachabilityCallback"); // We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively // in case someon uses the Reachablity object in a different thread. NSAutoreleasePool *myPool = [[NSAutoreleasePool alloc] init]; Reachability *noteObject = (Reachability *)info; // Post a notification to notify the client that the network reachability changed. [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:noteObject]; [myPool release]; } - (BOOL)startNotifier { BOOL retVal = NO; SCNetworkReachabilityContext context = { 0, self, NULL, NULL, NULL }; if (SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context)) { if (SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)) { retVal = YES; } } return retVal; } - (void)stopNotifier { if (reachabilityRef != NULL) { SCNetworkReachabilityUnscheduleFromRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode); } } - (void)dealloc { [self stopNotifier]; if (reachabilityRef != NULL) { CFRelease(reachabilityRef); } [super dealloc]; } + (Reachability *)reachabilityWithHostName:(NSString *)hostName; { Reachability *retVal = NULL; SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]); if (reachability != NULL) { retVal = [[[self alloc] init] autorelease]; if (retVal != NULL) { retVal->reachabilityRef = reachability; retVal->localWiFiRef = NO; } } return retVal; } + (Reachability *)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress; { SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress( kCFAllocatorDefault, (const struct sockaddr *)hostAddress); Reachability *retVal = NULL; if (reachability != NULL) { retVal = [[[self alloc] init] autorelease]; if (retVal != NULL) { retVal->reachabilityRef = reachability; retVal->localWiFiRef = NO; } } return retVal; } + (Reachability *)reachabilityForInternetConnection; { struct sockaddr_in zeroAddress; bzero(&zeroAddress, sizeof(zeroAddress)); zeroAddress.sin_len = sizeof(zeroAddress); zeroAddress.sin_family = AF_INET; return [self reachabilityWithAddress:&zeroAddress]; } + (Reachability *)reachabilityForLocalWiFi; { struct sockaddr_in localWifiAddress; bzero(&localWifiAddress, sizeof(localWifiAddress)); localWifiAddress.sin_len = sizeof(localWifiAddress); localWifiAddress.sin_family = AF_INET; // IN_LINKLOCALNETNUM is defined in as 169.254.0.0 localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM); Reachability *retVal = [self reachabilityWithAddress:&localWifiAddress]; if (retVal != NULL) { retVal->localWiFiRef = YES; } return retVal; } #pragma mark Network Flag Handling - (NetworkStatus)localWiFiStatusForFlags:(SCNetworkReachabilityFlags)flags { PrintReachabilityFlags(flags, "localWiFiStatusForFlags"); BOOL retVal = NotReachable; if ((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect)) { retVal = ReachableViaWiFi; } return retVal; } - (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags { PrintReachabilityFlags(flags, "networkStatusForFlags"); if ((flags & kSCNetworkReachabilityFlagsReachable) == 0) { // if target host is not reachable return NotReachable; } BOOL retVal = NotReachable; if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0) { // if target host is reachable and no connection is required // then we'll assume (for now) that your on Wi-Fi retVal = ReachableViaWiFi; } if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand) != 0) || (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0)) { // ... and the connection is on-demand (or on-traffic) if the // calling application is using the CFSocketStream or higher APIs if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0) { // ... and no [user] intervention is needed retVal = ReachableViaWiFi; } } if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN) { // ... but WWAN connections are OK if the calling application // is using the CFNetwork (CFSocketStream?) APIs. retVal = ReachableViaWWAN; } return retVal; } - (BOOL)connectionRequired; { NSAssert(reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef"); SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { return (flags & kSCNetworkReachabilityFlagsConnectionRequired); } return NO; } - (NetworkStatus)currentReachabilityStatus { NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef"); NetworkStatus retVal = NotReachable; SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { if (localWiFiRef) { retVal = [self localWiFiStatusForFlags:flags]; } else { retVal = [self networkStatusForFlags:flags]; } } return retVal; } @end