278 lines
9.1 KiB
Objective-C
278 lines
9.1 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: 2.2
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.
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("Apple") in consideration of your agreement to the following terms, and your
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use, installation, modification or redistribution of this Apple software
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constitutes acceptance of these terms. If you do not agree with these terms,
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please do not use, install, modify or redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and subject
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to these terms, Apple grants you a personal, non-exclusive license, under
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Apple's copyrights in this original Apple software (the "Apple Software"), to
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use, reproduce, modify and redistribute the Apple Software, with or without
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modifications, in source and/or binary forms; provided that if you redistribute
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the Apple Software in its entirety and without modifications, you must retain
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this notice and the following text and disclaimers in all such redistributions
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of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may be used
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to endorse or promote products derived from the Apple Software without specific
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prior written permission from Apple. Except as expressly stated in this notice,
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no other rights or licenses, express or implied, are granted by Apple herein,
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including but not limited to any patent rights that may be infringed by your
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derivative works or by other works in which the Apple Software may be
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incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR
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DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF
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CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF
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APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2010 Apple Inc. All Rights Reserved.
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*/
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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 <arpa/inet.h>
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#import <ifaddrs.h>
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#import <netdb.h>
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#import <CoreFoundation/CoreFoundation.h>
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#import "Reachability.h"
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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' : '-', comment);
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#endif
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}
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@implementation Reachability
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static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags,
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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([(NSObject *)info isKindOfClass:[Reachability class]],
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@"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
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object:noteObject];
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[myPool release];
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}
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- (BOOL)startNotifier
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{
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BOOL retVal = NO;
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SCNetworkReachabilityContext context = { 0, 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(),
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kCFRunLoopDefaultMode))
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{
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retVal = YES;
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}
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}
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return retVal;
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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(),
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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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[super dealloc];
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}
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+ (Reachability *)reachabilityWithHostName:(NSString *)hostName;
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{
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Reachability *retVal = NULL;
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SCNetworkReachabilityRef reachability =
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SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
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if (reachability != NULL)
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{
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retVal = [[[self alloc] init] autorelease];
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if (retVal != NULL)
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{
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retVal->reachabilityRef = reachability;
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retVal->localWiFiRef = NO;
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}
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}
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return retVal;
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}
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+ (Reachability *)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress;
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{
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SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(
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kCFAllocatorDefault, (const struct sockaddr *)hostAddress);
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Reachability *retVal = NULL;
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if (reachability != NULL)
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{
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retVal = [[[self alloc] init] autorelease];
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if (retVal != NULL)
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{
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retVal->reachabilityRef = reachability;
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retVal->localWiFiRef = NO;
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}
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}
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return retVal;
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}
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+ (Reachability *)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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+ (Reachability *)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 *retVal = [self reachabilityWithAddress:&localWifiAddress];
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if (retVal != NULL)
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{
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retVal->localWiFiRef = YES;
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}
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return retVal;
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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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BOOL retVal = NotReachable;
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if ((flags & kSCNetworkReachabilityFlagsReachable) &&
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(flags & kSCNetworkReachabilityFlagsIsDirect))
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{
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retVal = ReachableViaWiFi;
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}
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return retVal;
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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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// if target host is not reachable
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return NotReachable;
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}
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BOOL retVal = NotReachable;
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if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
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{
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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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}
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if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand) != 0) ||
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(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
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{
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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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{
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// ... and no [user] intervention is needed
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retVal = 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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// ... 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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}
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return retVal;
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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 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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{
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if (localWiFiRef)
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{
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retVal = [self localWiFiStatusForFlags:flags];
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}
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else
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{
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retVal = [self networkStatusForFlags:flags];
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}
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}
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return retVal;
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}
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@end
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