Apple's Reachability code is ludicrously complex (and APSL).

1 files changed, 0 insertions, 273 deletions

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-/*
- 
- 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(@"Reachability 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
-
-- (NetworkStatus) localWiFiStatusForFlags: (SCNetworkReachabilityFlags) flags
-{
-	PrintReachabilityFlags(flags, "localWiFiStatusForFlags");
-
-	NetworkStatus retVal = NotReachable;
-	if((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect))
-	{
-		retVal = ReachableViaWiFi;	
-	}
-	return retVal;
-}
-
-- (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags
-{
-	PrintReachabilityFlags(flags, "networkStatusForFlags");
-	if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
-	{
-		// if target host is not reachable
-		return NotReachable;
-	}
-
-	NetworkStatus 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;
-}
-
-- (NetworkStatus) currentReachabilityStatus
-{
-	NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef");
-	NetworkStatus retVal = NotReachable;
-	SCNetworkReachabilityFlags flags;
-	if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
-	{
-		if(localWiFiRef)
-		{
-			retVal = [self localWiFiStatusForFlags: flags];
-		}
-		else
-		{
-			retVal = [self networkStatusForFlags: flags];
-		}
-	}
-	return retVal;
-}
-@end