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Abstract: Basic demonstration of how to use the SystemConfiguration Reachablity APIs.
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.
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Copyright (C) 2009 Apple Inc. All Rights Reserved.
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#import <sys/socket.h>
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#import <netinet/in.h>
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#import <netinet6/in6.h>
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#import <CoreFoundation/CoreFoundation.h>
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#import "Reachability.h"
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#define kShouldPrintReachabilityFlags 0
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static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment)
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#if kShouldPrintReachabilityFlags
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NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n",
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(flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',
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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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@implementation Reachability
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static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
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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([(NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback");
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//We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively
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// in case someon uses the Reachablity object in a different thread.
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NSAutoreleasePool* myPool = [[NSAutoreleasePool alloc] init];
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Reachability* noteObject = (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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- (BOOL) startNotifer
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SCNetworkReachabilityContext context = {0, self, NULL, NULL, NULL};
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if(SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context))
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if(SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode))
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if(reachabilityRef!= NULL)
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SCNetworkReachabilityUnscheduleFromRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
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if(reachabilityRef!= NULL)
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CFRelease(reachabilityRef);
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+ (Reachability*) reachabilityWithHostName: (NSString*) hostName;
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Reachability* retVal = NULL;
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SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
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if(reachability!= NULL)
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retVal= [[[self alloc] init] autorelease];
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retVal->reachabilityRef = reachability;
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retVal->localWiFiRef = NO;
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+ (Reachability*) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;
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SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
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Reachability* retVal = NULL;
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if(reachability!= NULL)
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retVal= [[[self alloc] init] autorelease];
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retVal->reachabilityRef = reachability;
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retVal->localWiFiRef = NO;
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+ (Reachability*) reachabilityForInternetConnection;
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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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+ (Reachability*) reachabilityForLocalWiFi;
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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* retVal = [self reachabilityWithAddress: &localWifiAddress];
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retVal->localWiFiRef = YES;
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#pragma mark Network Flag Handling
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- (NetworkStatus) localWiFiStatusForFlags: (SCNetworkReachabilityFlags) flags
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PrintReachabilityFlags(flags, "localWiFiStatusForFlags");
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BOOL retVal = NotReachable;
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if((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect))
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retVal = ReachableViaWiFi;
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- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags
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PrintReachabilityFlags(flags, "networkStatusForFlags");
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if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
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// if target host is not reachable
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BOOL retVal = NotReachable;
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if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
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// if target host is reachable and no connection is required
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// then we'll assume (for now) that your on Wi-Fi
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retVal = ReachableViaWiFi;
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if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
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(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
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// ... and the connection is on-demand (or on-traffic) if the
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// calling application is using the CFSocketStream or higher APIs
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if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
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// ... and no [user] intervention is needed
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retVal = ReachableViaWiFi;
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if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
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// ... but WWAN connections are OK if the calling application
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// is using the CFNetwork (CFSocketStream?) APIs.
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retVal = ReachableViaWWAN;
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- (BOOL) connectionRequired;
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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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return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
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- (NetworkStatus) currentReachabilityStatus
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NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef");
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NetworkStatus retVal = NotReachable;
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SCNetworkReachabilityFlags flags;
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if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
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retVal = [self localWiFiStatusForFlags: flags];
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retVal = [self networkStatusForFlags: flags];
added
removed
Dependencies/Reachability/Reachability.m
