Naive Reachability replacement

ADVReachability.h

//
//  Copyright © 2013 Advantis
//

#import <SystemConfiguration/SystemConfiguration.h>

typedef void (^ADVReachabilityHandler)(SCNetworkReachabilityFlags flags);

@interface ADVReachability : NSObject

@property (readonly, nonatomic) SCNetworkReachabilityFlags flags;

- (instancetype) initWithHandler:(ADVReachabilityHandler)handler;

@end

ADVReachability.m

//
//  Copyright © 2013 Advantis
//

#import "ADVReachability.h"

@interface ADVReachability ()
@property (strong, nonatomic) ADVReachabilityHandler handler;
- (void) reachabilityDidChange:(SCNetworkReachabilityFlags)flags;
@end

static void ADVReachabilityCallback(__unused SCNetworkReachabilityRef reachability, SCNetworkReachabilityFlags flags, void *info)
{
    ADVReachability *self = (__bridge id) info;
    @autoreleasepool
    {
        [self reachabilityDidChange:flags];
    }
}

@implementation ADVReachability
{
    SCNetworkReachabilityRef _reachability;
}

#pragma mark - ADVReachability
- (instancetype) initWithHandler:(ADVReachabilityHandler)handler
{
    if ((self = [super init]))
    {
        struct sockaddr address = {sizeof address, AF_INET};
        _reachability = SCNetworkReachabilityCreateWithAddress(NULL, &address);

        if (handler)
        {
            _handler = handler;

            SCNetworkReachabilityContext context = {0, (__bridge void *) self};
            SCNetworkReachabilitySetCallback(_reachability, ADVReachabilityCallback, &context);
            SCNetworkReachabilityScheduleWithRunLoop(_reachability, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
        }
    }
    return self;
}

- (SCNetworkReachabilityFlags) flags
{
    SCNetworkReachabilityFlags flags;
    SCNetworkReachabilityGetFlags(_reachability, &flags);
    return flags;
}

- (void) reachabilityDidChange:(SCNetworkReachabilityFlags)flags
{
    _handler(flags);
}

#pragma mark - NSObject
- (void) dealloc
{
    SCNetworkReachabilityUnscheduleFromRunLoop(_reachability, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
    CFRelease(_reachability);
}

@end