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@@ -0,0 +1,475 @@
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+/*
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+ Copyright (c) 2011, Tony Million.
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+ All rights reserved.
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+
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+ Redistribution and use in source and binary forms, with or without
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+ modification, are permitted provided that the following conditions are met:
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+
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+ 1. Redistributions of source code must retain the above copyright notice, this
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+ list of conditions and the following disclaimer.
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+
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+ 2. Redistributions in binary form must reproduce the above copyright notice,
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+ this list of conditions and the following disclaimer in the documentation
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+ and/or other materials provided with the distribution.
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+
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+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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+ 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) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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+ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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+ POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#import "Reachability.h"
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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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+
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+
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+NSString *const kReachabilityChangedNotification = @"kReachabilityChangedNotification";
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+
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+
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+@interface Reachability ()
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+
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+@property (nonatomic, assign) SCNetworkReachabilityRef reachabilityRef;
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+@property (nonatomic, strong) dispatch_queue_t reachabilitySerialQueue;
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+@property (nonatomic, strong) id reachabilityObject;
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+
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+-(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags;
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+-(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags;
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+
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+@end
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+
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+
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+static NSString *reachabilityFlags(SCNetworkReachabilityFlags flags)
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+{
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+ return [NSString stringWithFormat:@"%c%c %c%c%c%c%c%c%c",
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+#if TARGET_OS_IPHONE
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+ (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',
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+#else
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+ 'X',
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+#endif
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+ (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-',
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+ (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-',
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+ (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-',
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+ (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',
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+ (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-',
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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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+}
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+
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+// Start listening for reachability notifications on the current run loop
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+static void TMReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
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+{
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+#pragma unused (target)
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+
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+ Reachability *reachability = ((__bridge Reachability*)info);
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+
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+ // We probably don't need an autoreleasepool here, as GCD docs state each queue has its own autorelease pool,
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+ // but what the heck eh?
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+ @autoreleasepool
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+ {
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+ [reachability reachabilityChanged:flags];
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+ }
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+}
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+
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+
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+@implementation Reachability
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+
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+#pragma mark - Class Constructor Methods
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+
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++(instancetype)reachabilityWithHostName:(NSString*)hostname
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+{
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+ return [Reachability reachabilityWithHostname:hostname];
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+}
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+
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++(instancetype)reachabilityWithHostname:(NSString*)hostname
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+{
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+ SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(NULL, [hostname UTF8String]);
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+ if (ref)
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+ {
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+ id reachability = [[self alloc] initWithReachabilityRef:ref];
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+
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+ return reachability;
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+ }
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+
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+ return nil;
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+}
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+
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++(instancetype)reachabilityWithAddress:(void *)hostAddress
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+{
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+ SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
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+ if (ref)
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+ {
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+ id reachability = [[self alloc] initWithReachabilityRef:ref];
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+
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+ return reachability;
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+ }
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+
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+ return nil;
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+}
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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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+
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+ return [self reachabilityWithAddress:&zeroAddress];
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+}
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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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+
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+ return [self reachabilityWithAddress:&localWifiAddress];
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+}
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+
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+
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+// Initialization methods
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+
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+-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref
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+{
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+ self = [super init];
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+ if (self != nil)
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+ {
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+ self.reachableOnWWAN = YES;
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+ self.reachabilityRef = ref;
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+
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+ // We need to create a serial queue.
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+ // We allocate this once for the lifetime of the notifier.
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+
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+ self.reachabilitySerialQueue = dispatch_queue_create("com.tonymillion.reachability", NULL);
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+ }
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+
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+ return self;
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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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+
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+ if(self.reachabilityRef)
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+ {
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+ CFRelease(self.reachabilityRef);
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+ self.reachabilityRef = nil;
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+ }
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+
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+ self.reachableBlock = nil;
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+ self.unreachableBlock = nil;
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+ self.reachabilityBlock = nil;
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+ self.reachabilitySerialQueue = nil;
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+}
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+
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+#pragma mark - Notifier Methods
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+
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+// Notifier
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+// NOTE: This uses GCD to trigger the blocks - they *WILL NOT* be called on THE MAIN THREAD
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+// - In other words DO NOT DO ANY UI UPDATES IN THE BLOCKS.
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+// INSTEAD USE dispatch_async(dispatch_get_main_queue(), ^{UISTUFF}) (or dispatch_sync if you want)
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+
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+-(BOOL)startNotifier
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+{
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+ // allow start notifier to be called multiple times
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+ if(self.reachabilityObject && (self.reachabilityObject == self))
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+ {
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+ return YES;
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+ }
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+
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+
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+ SCNetworkReachabilityContext context = { 0, NULL, NULL, NULL, NULL };
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+ context.info = (__bridge void *)self;
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+
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+ if(SCNetworkReachabilitySetCallback(self.reachabilityRef, TMReachabilityCallback, &context))
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+ {
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+ // Set it as our reachability queue, which will retain the queue
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+ if(SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, self.reachabilitySerialQueue))
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+ {
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+ // this should do a retain on ourself, so as long as we're in notifier mode we shouldn't disappear out from under ourselves
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+ // woah
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+ self.reachabilityObject = self;
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+ return YES;
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+ }
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+ else
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+ {
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+#ifdef DEBUG
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+ NSLog(@"SCNetworkReachabilitySetDispatchQueue() failed: %s", SCErrorString(SCError()));
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+#endif
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+
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+ // UH OH - FAILURE - stop any callbacks!
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+ SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
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+ }
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+ }
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+ else
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+ {
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+#ifdef DEBUG
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+ NSLog(@"SCNetworkReachabilitySetCallback() failed: %s", SCErrorString(SCError()));
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+#endif
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+ }
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+
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+ // if we get here we fail at the internet
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+ self.reachabilityObject = nil;
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+ return NO;
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+}
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+
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+-(void)stopNotifier
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+{
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+ // First stop, any callbacks!
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+ SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
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+
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+ // Unregister target from the GCD serial dispatch queue.
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+ SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, NULL);
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+
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+ self.reachabilityObject = nil;
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+}
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+
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+#pragma mark - reachability tests
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+
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+// This is for the case where you flick the airplane mode;
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+// you end up getting something like this:
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+//Reachability: WR ct-----
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+//Reachability: -- -------
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+//Reachability: WR ct-----
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+//Reachability: -- -------
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+// We treat this as 4 UNREACHABLE triggers - really apple should do better than this
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+
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+#define testcase (kSCNetworkReachabilityFlagsConnectionRequired | kSCNetworkReachabilityFlagsTransientConnection)
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+
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+-(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags
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+{
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+ BOOL connectionUP = YES;
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+
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+ if(!(flags & kSCNetworkReachabilityFlagsReachable))
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+ connectionUP = NO;
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+
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+ if( (flags & testcase) == testcase )
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+ connectionUP = NO;
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+
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+#if TARGET_OS_IPHONE
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+ if(flags & kSCNetworkReachabilityFlagsIsWWAN)
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+ {
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+ // We're on 3G.
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+ if(!self.reachableOnWWAN)
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+ {
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+ // We don't want to connect when on 3G.
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+ connectionUP = NO;
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+ }
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+ }
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+#endif
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+
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+ return connectionUP;
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+}
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+
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+-(BOOL)isReachable
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+{
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+ SCNetworkReachabilityFlags flags;
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+
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+ if(!SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ return NO;
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+
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+ return [self isReachableWithFlags:flags];
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+}
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+
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+-(BOOL)isReachableViaWWAN
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+{
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+#if TARGET_OS_IPHONE
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+
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+ SCNetworkReachabilityFlags flags = 0;
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+
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+ if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ // Check we're REACHABLE
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+ if(flags & kSCNetworkReachabilityFlagsReachable)
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+ {
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+ // Now, check we're on WWAN
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+ if(flags & kSCNetworkReachabilityFlagsIsWWAN)
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+ {
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+ return YES;
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+ }
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+ }
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+ }
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+#endif
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+
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+ return NO;
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+}
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+
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+-(BOOL)isReachableViaWiFi
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+{
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+ SCNetworkReachabilityFlags flags = 0;
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+
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+ if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ // Check we're reachable
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+ if((flags & kSCNetworkReachabilityFlagsReachable))
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+ {
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+#if TARGET_OS_IPHONE
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+ // Check we're NOT on WWAN
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+ if((flags & kSCNetworkReachabilityFlagsIsWWAN))
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+ {
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+ return NO;
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+ }
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+#endif
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+ return YES;
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+ }
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+ }
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+
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+ return NO;
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+}
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+
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+
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+// WWAN may be available, but not active until a connection has been established.
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+// WiFi may require a connection for VPN on Demand.
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+-(BOOL)isConnectionRequired
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+{
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+ return [self connectionRequired];
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+}
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+
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+-(BOOL)connectionRequired
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+{
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+ SCNetworkReachabilityFlags flags;
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+
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+ if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
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+ }
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+
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+ return NO;
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+}
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+
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+// Dynamic, on demand connection?
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+-(BOOL)isConnectionOnDemand
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+{
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+ SCNetworkReachabilityFlags flags;
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+
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+ if (SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) &&
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+ (flags & (kSCNetworkReachabilityFlagsConnectionOnTraffic | kSCNetworkReachabilityFlagsConnectionOnDemand)));
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+ }
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+
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+ return NO;
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+}
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+
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+// Is user intervention required?
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+-(BOOL)isInterventionRequired
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+{
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+ SCNetworkReachabilityFlags flags;
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+
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+ if (SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) &&
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+ (flags & kSCNetworkReachabilityFlagsInterventionRequired));
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+ }
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+
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+ return NO;
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+}
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+
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+
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+#pragma mark - reachability status stuff
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+
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+-(NetworkStatus)currentReachabilityStatus
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+{
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+ if([self isReachable])
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+ {
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+ if([self isReachableViaWiFi])
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+ return ReachableViaWiFi;
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+
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+#if TARGET_OS_IPHONE
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+ return ReachableViaWWAN;
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+#endif
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+ }
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+
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+ return NotReachable;
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+}
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+
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+-(SCNetworkReachabilityFlags)reachabilityFlags
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+{
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+ SCNetworkReachabilityFlags flags = 0;
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+
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+ if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
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+ {
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+ return flags;
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+ }
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+
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+ return 0;
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+}
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+
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+-(NSString*)currentReachabilityString
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+{
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+ NetworkStatus temp = [self currentReachabilityStatus];
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+
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+ if(temp == ReachableViaWWAN)
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+ {
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+ // Updated for the fact that we have CDMA phones now!
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+ return NSLocalizedString(@"Cellular", @"");
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+ }
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+ if (temp == ReachableViaWiFi)
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+ {
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+ return NSLocalizedString(@"WiFi", @"");
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+ }
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+
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+ return NSLocalizedString(@"No Connection", @"");
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+}
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+
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+-(NSString*)currentReachabilityFlags
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+{
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+ return reachabilityFlags([self reachabilityFlags]);
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+}
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+
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+#pragma mark - Callback function calls this method
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+
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+-(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags
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+{
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+ if([self isReachableWithFlags:flags])
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+ {
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+ if(self.reachableBlock)
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+ {
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|
+ self.reachableBlock(self);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if(self.unreachableBlock)
|
|
|
+ {
|
|
|
+ self.unreachableBlock(self);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if(self.reachabilityBlock)
|
|
|
+ {
|
|
|
+ self.reachabilityBlock(self, flags);
|
|
|
+ }
|
|
|
+
|
|
|
+ // this makes sure the change notification happens on the MAIN THREAD
|
|
|
+ dispatch_async(dispatch_get_main_queue(), ^{
|
|
|
+ [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification
|
|
|
+ object:self];
|
|
|
+ });
|
|
|
+}
|
|
|
+
|
|
|
+#pragma mark - Debug Description
|
|
|
+
|
|
|
+- (NSString *) description
|
|
|
+{
|
|
|
+ NSString *description = [NSString stringWithFormat:@"<%@: %#x (%@)>",
|
|
|
+ NSStringFromClass([self class]), (unsigned int) self, [self currentReachabilityFlags]];
|
|
|
+ return description;
|
|
|
+}
|
|
|
+
|
|
|
+@end
|
