text: //
  //  TuNetworkReachability.h
  //  TuSDK
  //
  /*
   Copyright (c) 2011, Tony Million.
   All rights reserved.
   
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
   
   1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
   
   2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
   
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
   */
  
  #import <Foundation/Foundation.h>
  #import <SystemConfiguration/SystemConfiguration.h>
  #import <TuSDKPulseCore/TUCEnum.h>
  #import <sys/socket.h>
  #import <netinet/in.h>
  #import <netinet6/in6.h>
  #import <arpa/inet.h>
  #import <ifaddrs.h>
  #import <netdb.h>
  
  /**
   * Does ARC support support GCD objects?
   * It does if the minimum deployment target is iOS 6+ or Mac OS X 8+
   **/
  #if TARGET_OS_IPHONE
  
  // Compiling for iOS
  
  #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 60000 // iOS 6.0 or later
  #define LSQ_NEEDS_DISPATCH_RETAIN_RELEASE 0
  #else                                         // iOS 5.X or earlier
  #define LSQ_NEEDS_DISPATCH_RETAIN_RELEASE 1
  #endif
  
  #else
  
  // Compiling for Mac OS X
  
  #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1080     // Mac OS X 10.8 or later
  #define LSQ_NEEDS_DISPATCH_RETAIN_RELEASE 0
  #else
  #define LSQ_NEEDS_DISPATCH_RETAIN_RELEASE 1     // Mac OS X 10.7 or earlier
  #endif
  
  #endif
  
  extern NSString *const kTuSDKNetworkReachabilityChangedNotification;
  
  
  
  @class TuNetworkReachability;
  
  typedef void (^TuSDKNetworkReachable)(TuNetworkReachability * reachability);
  typedef void (^TuSDKNetworkUnreachable)(TuNetworkReachability * reachability);
  
  @interface TuNetworkReachability : NSObject
  
  @property (nonatomic, copy) TuSDKNetworkReachable    reachableBlock;
  @property (nonatomic, copy) TuSDKNetworkUnreachable  unreachableBlock;
  
  
  @property (nonatomic, assign) BOOL reachableOnWWAN;
  
  +(TuNetworkReachability*)reachabilityWithHostname:(NSString*)hostname;
  +(TuNetworkReachability*)reachabilityForInternetConnection;
  +(TuNetworkReachability*)reachabilityWithAddress:(const struct sockaddr_in*)hostAddress;
  +(TuNetworkReachability*)reachabilityForLocalWiFi;
  
  -(TuNetworkReachability *)initWithReachabilityRef:(SCNetworkReachabilityRef)ref;
  
  -(BOOL)startNotifier;
  -(void)stopNotifier;
  
  -(BOOL)isReachable;
  -(BOOL)isReachableViaWWAN;
  -(BOOL)isReachableViaWiFi;
  
  // WWAN may be available, but not active until a connection has been established.
  // WiFi may require a connection for VPN on Demand.
  -(BOOL)isConnectionRequired; // Identical DDG variant.
  -(BOOL)connectionRequired; // Apple's routine.
  // Dynamic, on demand connection?
  -(BOOL)isConnectionOnDemand;
  // Is user intervention required?
  -(BOOL)isInterventionRequired;
  
  -(TuSDKNetworkStatus)currentReachabilityStatus;
  -(SCNetworkReachabilityFlags)reachabilityFlags;
  -(NSString*)currentReachabilityString;
  -(NSString*)currentReachabilityFlags;
  @end
  