提交

Pods/AliyunOSSiOS/AliyunOSSSDK/OSSFileLog/OSSReachability.m

@@ -0,0 +1,248 @@
+/*
+ Copyright (C) 2016 Apple Inc. All Rights Reserved.
+ See LICENSE.txt for this sample’s licensing information
+ 
+ Abstract:
+ Basic demonstration of how to use the SystemConfiguration Reachablity APIs.
+ */
+
+#import <arpa/inet.h>
+#import <ifaddrs.h>
+#import <netdb.h>
+#import <sys/socket.h>
+#import <netinet/in.h>
+#import <CoreFoundation/CoreFoundation.h>
+
+#import "OSSReachability.h"
+
+#pragma mark IPv6 Support
+//Reachability fully support IPv6.  For full details, see ReadMe.md.
+
+
+NSString *ossReachabilityChangedNotification = @"ossNetworkReachabilityChangedNotification";
+
+#ifndef kShouldPrintReachabilityFlags
+#if TARGET_OS_IOS
+#define kShouldPrintReachabilityFlags 1
+#else
+#define kShouldPrintReachabilityFlags 0
+#endif
+#endif
+
+#pragma mark - Supporting functions
+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
+}
+
+
+static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
+{
+#pragma unused (target, flags)
+	NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback");
+	NSCAssert([(__bridge NSObject*) info isKindOfClass: [OSSReachability class]], @"info was wrong class in ReachabilityCallback");
+
+    OSSReachability* noteObject = (__bridge OSSReachability *)info;
+    // Post a notification to notify the client that the network reachability changed.
+    [[NSNotificationCenter defaultCenter] postNotificationName: ossReachabilityChangedNotification object: noteObject];
+}
+
+
+#pragma mark - Reachability implementation
+
+@implementation OSSReachability
+{
+	SCNetworkReachabilityRef _reachabilityRef;
+}
+
++ (instancetype)reachabilityWithHostName:(NSString *)hostName
+{
+	OSSReachability* returnValue = NULL;
+	SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
+	if (reachability != NULL)
+	{
+		returnValue= [[self alloc] init];
+		if (returnValue != NULL)
+		{
+			returnValue->_reachabilityRef = reachability;
+		}
+        else {
+            CFRelease(reachability);
+        }
+	}
+	return returnValue;
+}
+
+
++ (instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress
+{
+	SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, hostAddress);
+
+	OSSReachability* returnValue = NULL;
+
+	if (reachability != NULL)
+	{
+		returnValue = [[self alloc] init];
+		if (returnValue != NULL)
+		{
+			returnValue->_reachabilityRef = reachability;
+		}
+        else {
+            CFRelease(reachability);
+        }
+	}
+	return returnValue;
+}
+
+
++ (instancetype)reachabilityForInternetConnection
+{
+	struct sockaddr_in zeroAddress;
+	bzero(&zeroAddress, sizeof(zeroAddress));
+	zeroAddress.sin_len = sizeof(zeroAddress);
+	zeroAddress.sin_family = AF_INET;
+    
+    return [self reachabilityWithAddress: (const struct sockaddr *) &zeroAddress];
+}
+
+#pragma mark reachabilityForLocalWiFi
+//reachabilityForLocalWiFi has been removed from the sample.  See ReadMe.md for more information.
+//+ (instancetype)reachabilityForLocalWiFi
+
+
+
+#pragma mark - Start and stop notifier
+
+- (BOOL)startNotifier
+{
+	BOOL returnValue = NO;
+	SCNetworkReachabilityContext context = {0, (__bridge void *)(self), NULL, NULL, NULL};
+
+	if (SCNetworkReachabilitySetCallback(_reachabilityRef, ReachabilityCallback, &context))
+	{
+		if (SCNetworkReachabilityScheduleWithRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode))
+		{
+			returnValue = YES;
+		}
+	}
+    
+	return returnValue;
+}
+
+
+- (void)stopNotifier
+{
+	if (_reachabilityRef != NULL)
+	{
+		SCNetworkReachabilityUnscheduleFromRunLoop(_reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
+	}
+}
+
+
+- (void)dealloc
+{
+	[self stopNotifier];
+	if (_reachabilityRef != NULL)
+	{
+		CFRelease(_reachabilityRef);
+	}
+}
+
+
+#pragma mark - Network Flag Handling
+
+- (OSSNetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags
+{
+	PrintReachabilityFlags(flags, "networkStatusForFlags");
+	if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
+	{
+		// The target host is not reachable.
+		return OSSNotReachable;
+	}
+
+    OSSNetworkStatus returnValue = OSSNotReachable;
+
+	if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
+	{
+		/*
+         If the target host is reachable and no connection is required then we'll assume (for now) that you're on Wi-Fi...
+         */
+		returnValue = OSSReachableViaWiFi;
+	}
+
+	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...
+             */
+            returnValue = OSSReachableViaWiFi;
+        }
+    }
+
+#if TARGET_OS_IOS
+    if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
+    {
+        /*
+         ... but WWAN connections are OK if the calling application is using the CFNetwork APIs.
+         */
+        returnValue = OSSReachableViaWWAN;
+    }
+#endif
+
+    
+	return returnValue;
+}
+
+
+- (BOOL)connectionRequired
+{
+	NSAssert(_reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef");
+	SCNetworkReachabilityFlags flags;
+
+	if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags))
+	{
+		return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
+	}
+
+    return NO;
+}
+
+
+- (OSSNetworkStatus)currentReachabilityStatus
+{
+	NSAssert(_reachabilityRef != NULL, @"currentOSSNetworkStatus called with NULL SCNetworkReachabilityRef");
+	OSSNetworkStatus returnValue = OSSNotReachable;
+	SCNetworkReachabilityFlags flags;
+    
+	if (SCNetworkReachabilityGetFlags(_reachabilityRef, &flags))
+	{
+        returnValue = [self networkStatusForFlags:flags];
+	}
+    
+	return returnValue;
+}
+
+
+@end