/* Copyright (c) 2011, Tony Million. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #import "Reachability.h" NSString *const kReachabilityChangedNotification = @"kReachabilityChangedNotification"; @interface Reachability () @property (nonatomic, assign) SCNetworkReachabilityRef reachabilityRef; #if NEEDS_DISPATCH_RETAIN_RELEASE @property (nonatomic, assign) dispatch_queue_t reachabilitySerialQueue; #else @property (nonatomic, strong) dispatch_queue_t reachabilitySerialQueue; #endif @property (nonatomic, strong) id reachabilityObject; -(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags; -(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags; @end static NSString *reachabilityFlags(SCNetworkReachabilityFlags flags) { return [NSString stringWithFormat:@"%c%c %c%c%c%c%c%c%c", #if TARGET_OS_IPHONE (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-', #else 'X', #endif (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-', (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-', (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-', (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-', (flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-', (flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-', (flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-']; } //Start listening for reachability notifications on the current run loop static void TMReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) { #pragma unused (target) #if __has_feature(objc_arc) Reachability *reachability = ((__bridge Reachability*)info); #else Reachability *reachability = ((Reachability*)info); #endif // we probably dont need an autoreleasepool here as GCD docs state each queue has its own autorelease pool // but what the heck eh? @autoreleasepool { [reachability reachabilityChanged:flags]; } } @implementation Reachability @synthesize reachabilityRef; @synthesize reachabilitySerialQueue; @synthesize reachableOnWWAN; @synthesize reachableBlock; @synthesize unreachableBlock; @synthesize reachabilityObject; #pragma mark - class constructor methods +(Reachability*)reachabilityWithHostname:(NSString*)hostname { SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(NULL, [hostname UTF8String]); if (ref) { id reachability = [[self alloc] initWithReachabilityRef:ref]; #if __has_feature(objc_arc) return reachability; #else return [reachability autorelease]; #endif } return nil; } +(Reachability *)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress { SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress); if (ref) { id reachability = [[self alloc] initWithReachabilityRef:ref]; #if __has_feature(objc_arc) return reachability; #else return [reachability autorelease]; #endif } return nil; } +(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); return [self reachabilityWithAddress:&localWifiAddress]; } // initialization methods -(Reachability *)initWithReachabilityRef:(SCNetworkReachabilityRef)ref { self = [super init]; if (self != nil) { self.reachableOnWWAN = YES; self.reachabilityRef = ref; } return self; } -(void)dealloc { [self stopNotifier]; if(self.reachabilityRef) { CFRelease(self.reachabilityRef); self.reachabilityRef = nil; } self.reachableBlock = nil; self.unreachableBlock = nil; #if !(__has_feature(objc_arc)) [super dealloc]; #endif } #pragma mark - notifier methods // Notifier // NOTE: this uses GCD to trigger the blocks - they *WILL NOT* be called on THE MAIN THREAD // - In other words DO NOT DO ANY UI UPDATES IN THE BLOCKS. // INSTEAD USE dispatch_async(dispatch_get_main_queue(), ^{UISTUFF}) (or dispatch_sync if you want) -(BOOL)startNotifier { SCNetworkReachabilityContext context = { 0, NULL, NULL, NULL, NULL }; // this should do a retain on ourself, so as long as we're in notifier mode we shouldn't disappear out from under ourselves // woah self.reachabilityObject = self; // first we need to create a serial queue // we allocate this once for the lifetime of the notifier self.reachabilitySerialQueue = dispatch_queue_create("com.tonymillion.reachability", NULL); if(!self.reachabilitySerialQueue) { return NO; } #if __has_feature(objc_arc) context.info = (__bridge void *)self; #else context.info = (void *)self; #endif if (!SCNetworkReachabilitySetCallback(self.reachabilityRef, TMReachabilityCallback, &context)) { #ifdef DEBUG NSLog(@"SCNetworkReachabilitySetCallback() failed: %s", SCErrorString(SCError())); #endif //clear out the dispatch queue if(self.reachabilitySerialQueue) { #if NEEDS_DISPATCH_RETAIN_RELEASE dispatch_release(self.reachabilitySerialQueue); #endif self.reachabilitySerialQueue = nil; } self.reachabilityObject = nil; return NO; } // set it as our reachability queue which will retain the queue if(!SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, self.reachabilitySerialQueue)) { #ifdef DEBUG NSLog(@"SCNetworkReachabilitySetDispatchQueue() failed: %s", SCErrorString(SCError())); #endif //UH OH - FAILURE! // first stop any callbacks! SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL); // then clear out the dispatch queue if(self.reachabilitySerialQueue) { #if NEEDS_DISPATCH_RETAIN_RELEASE dispatch_release(self.reachabilitySerialQueue); #endif self.reachabilitySerialQueue = nil; } self.reachabilityObject = nil; return NO; } return YES; } -(void)stopNotifier { // first stop any callbacks! SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL); // unregister target from the GCD serial dispatch queue SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, NULL); if(self.reachabilitySerialQueue) { #if NEEDS_DISPATCH_RETAIN_RELEASE dispatch_release(self.reachabilitySerialQueue); #endif self.reachabilitySerialQueue = nil; } self.reachabilityObject = nil; } #pragma mark - reachability tests // this is for the case where you flick the airplane mode // you end up getting something like this: //Reachability: WR ct----- //Reachability: -- ------- //Reachability: WR ct----- //Reachability: -- ------- // we treat this as 4 UNREACHABLE triggers - really apple should do better than this #define testcase (kSCNetworkReachabilityFlagsConnectionRequired | kSCNetworkReachabilityFlagsTransientConnection) -(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags { BOOL connectionUP = YES; if(!(flags & kSCNetworkReachabilityFlagsReachable)) connectionUP = NO; if( (flags & testcase) == testcase ) connectionUP = NO; #if TARGET_OS_IPHONE if(flags & kSCNetworkReachabilityFlagsIsWWAN) { // we're on 3G if(!self.reachableOnWWAN) { // we dont want to connect when on 3G connectionUP = NO; } } #endif return connectionUP; } -(BOOL)isReachable { SCNetworkReachabilityFlags flags; if(!SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags)) return NO; return [self isReachableWithFlags:flags]; } -(BOOL)isReachableViaWWAN { #if TARGET_OS_IPHONE SCNetworkReachabilityFlags flags = 0; if(SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { // check we're REACHABLE if(flags & kSCNetworkReachabilityFlagsReachable) { // now, check we're on WWAN if(flags & kSCNetworkReachabilityFlagsIsWWAN) { return YES; } } } #endif return NO; } -(BOOL)isReachableViaWiFi { SCNetworkReachabilityFlags flags = 0; if(SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { // check we're reachable if((flags & kSCNetworkReachabilityFlagsReachable)) { #if TARGET_OS_IPHONE // check we're NOT on WWAN if((flags & kSCNetworkReachabilityFlagsIsWWAN)) { return NO; } #endif return YES; } } return NO; } // WWAN may be available, but not active until a connection has been established. // WiFi may require a connection for VPN on Demand. -(BOOL)isConnectionRequired { return [self connectionRequired]; } -(BOOL)connectionRequired { SCNetworkReachabilityFlags flags; if(SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { return (flags & kSCNetworkReachabilityFlagsConnectionRequired); } return NO; } // Dynamic, on demand connection? -(BOOL)isConnectionOnDemand { SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) && (flags & (kSCNetworkReachabilityFlagsConnectionOnTraffic | kSCNetworkReachabilityFlagsConnectionOnDemand))); } return NO; } // Is user intervention required? -(BOOL)isInterventionRequired { SCNetworkReachabilityFlags flags; if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) && (flags & kSCNetworkReachabilityFlagsInterventionRequired)); } return NO; } #pragma mark - reachability status stuff -(NetworkStatus)currentReachabilityStatus { if([self isReachable]) { if([self isReachableViaWiFi]) return ReachableViaWiFi; #if TARGET_OS_IPHONE return ReachableViaWWAN; #endif } return NotReachable; } -(SCNetworkReachabilityFlags)reachabilityFlags { SCNetworkReachabilityFlags flags = 0; if(SCNetworkReachabilityGetFlags(reachabilityRef, &flags)) { return flags; } return 0; } -(NSString*)currentReachabilityString { NetworkStatus temp = [self currentReachabilityStatus]; if(temp == reachableOnWWAN) { // updated for the fact we have CDMA phones now! return NSLocalizedString(@"Cellular", @""); } if (temp == ReachableViaWiFi) { return NSLocalizedString(@"WiFi", @""); } return NSLocalizedString(@"No Connection", @""); } -(NSString*)currentReachabilityFlags { return reachabilityFlags([self reachabilityFlags]); } #pragma mark - callback function calls this method -(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags { if([self isReachableWithFlags:flags]) { if(self.reachableBlock) { self.reachableBlock(self); } } else { if(self.unreachableBlock) { self.unreachableBlock(self); } } // this makes sure the change notification happens on the MAIN THREAD dispatch_async(dispatch_get_main_queue(), ^{ [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:self]; }); } @end