32 

    33 

    34 +(NSInteger) randomPort {

    35     srandom(time(NULL));

    36     NSInteger res = (random() % 64511) + 1024;

    37     return (res == NETGAME_DEFAULT_PORT) ? [ServerSetup randomPort] : res;

    38 }

    39 

    40 +(BOOL) isNetworkReachable {

    41     // Create zero addy

    42     struct sockaddr_in zeroAddress;

    43     bzero(&zeroAddress, sizeof(zeroAddress));

    44     zeroAddress.sin_len = sizeof(zeroAddress);

    45     zeroAddress.sin_family = AF_INET;

    46 

    47     // Recover reachability flags

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

    49     SCNetworkReachabilityFlags flags;

    50 

    51     BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);

    52     CFRelease(defaultRouteReachability);

    53 

    54     if (!didRetrieveFlags) {

    55         NSLog(@"Error. Could not recover network reachability flags");

    56         return NO;

    57     }

    58 

    59     BOOL isReachable = flags & kSCNetworkFlagsReachable;

    60     BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;

    61     BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;

    62 

    63     NSURL *testURL = [NSURL URLWithString:@"http://www.apple.com/"];

    64     NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL

    65                                                  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

    66                                              timeoutInterval:20.0];

    67     NSURLConnection *testConnection = [[NSURLConnection alloc] initWithRequest:testRequest delegate:nil];

    68     BOOL testResult = testConnection ? YES : NO;

    69     [testConnection release];

    70 

    71     return ((isReachable && !needsConnection) || nonWiFi) ? testResult : NO;

    72 }