/External/Reachability/Reachability.m
Objective C | 287 lines | 193 code | 36 blank | 58 comment | 30 complexity | 61ccbf3c0f0e5fa903d18e3739491cee MD5 | raw file
- /*
-
- 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.
-
- In consideration of your agreement to abide by the following terms, and subject
- to these terms, Apple grants you a personal, non-exclusive license, under
- Apple's copyrights in this original Apple software (the "Apple Software"), to
- use, reproduce, modify and redistribute the Apple Software, with or without
- modifications, in source and/or binary forms; provided that if you redistribute
- the Apple Software in its entirety and without modifications, you must retain
- this notice and the following text and disclaimers in all such redistributions
- of the Apple Software.
- Neither the name, trademarks, service marks or logos of Apple Inc. may be used
- to endorse or promote products derived from the Apple Software without specific
- prior written permission from Apple. 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 <sys/socket.h>
- #import <netinet/in.h>
- #import <netinet6/in6.h>
- #import <arpa/inet.h>
- #import <ifaddrs.h>
- #import <netdb.h>
- #import <CoreFoundation/CoreFoundation.h>
- #import "Reachability.h"
- #define kShouldPrintReachabilityFlags 1
- static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment)
- {
- #if kShouldPrintReachabilityFlags
-
- NSLog(@"QBReachability 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 <netinet/in.h> 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
- - (QBNetworkStatus) localWiFiStatusForFlags: (SCNetworkReachabilityFlags) flags
- {
- PrintReachabilityFlags(flags, "localWiFiStatusForFlags");
-
- BOOL retVal = NotReachable;
- if((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect))
- {
- retVal = ReachableViaWiFi;
- }
- return retVal;
- }
- - (QBNetworkStatus) 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;
- }
- - (QBNetworkStatus) currentReachabilityStatus
- {
- NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef");
- QBNetworkStatus retVal = NotReachable;
- SCNetworkReachabilityFlags flags;
- if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
- {
- if(localWiFiRef)
- {
- retVal = [self localWiFiStatusForFlags: flags];
- }
- else
- {
- retVal = [self networkStatusForFlags: flags];
- }
- }
- return retVal;
- }
- #pragma mark Check Internet connect
- + (BOOL)internetConnected {
- Reachability* reachability = [Reachability reachabilityWithHostName:@"www.apple.com"];
- QBNetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];
-
- if(remoteHostStatus == NotReachable) {
- return NO;
- }
-
- return YES;
- }
- @end