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311 lines
9.4 KiB
Objective-C
311 lines
9.4 KiB
Objective-C
/*
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File: Reachability.m
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Abstract: Basic demonstration of how to use the SystemConfiguration Reachablity APIs.
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Version: 3.5
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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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%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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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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}
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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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}
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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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if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
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{
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/*
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... but WWAN connections are OK if the calling application is using the CFNetwork APIs.
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*/
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returnValue = ReachableViaWWAN;
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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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