#import <SystemConfiguration/SCNetworkReachability.h>

#include <netinet/in.h>

 

- (BOOL) connectedToNetwork

{

    // Create zero addy

    struct sockaddr_in zeroAddress;

    bzero(&zeroAddress, sizeof(zeroAddress));

    zeroAddress.sin_len = sizeof(zeroAddress);

    zeroAddress.sin_family = AF_INET;

    // Recover reachability flags

    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);

    SCNetworkReachabilityFlags flags;

    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);

    CFRelease(defaultRouteReachability);

    if (!didRetrieveFlags)

    {

        printf("Error. Could not recover network reachability flags\n");

        return 0;

    }

    BOOL isReachable = flags & kSCNetworkFlagsReachable;

    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;

BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;

    return ((isReachable && !needsConnection) || nonWiFi) ? 

(([[NSURLConnection alloc] initWithRequest:[NSURLRequest 

requestWithURL: [NSURL URLWithString:@"http://www.apple.com/"] 

cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0] 

  delegate:self]) ? YES : NO) : NO;

}