iPhone internet connection check (WiFi, 3G, Edge) something like Reachability.h

Usage is really simple:

if ([Connection isConnected]) {  ...  }
else {  ...  }

Connection.m file:

//
//  Connection.m
//  iBlog
//
//  Created by Ondrej Rafaj on 12.11.09.
//  Copyright 2009 Home. All rights reserved.
//

#import "Connection.h"

@implementation Connection

+ (BOOL) isConnected {
	// 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) {
        NSLog(@"Error. Could not recover network reachability flags");
		return NO;
    }
	BOOL isReachable = flags & kSCNetworkFlagsReachable;
	BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
	BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
	NSURL *testURL = [NSURL URLWithString:@"http://www.google.com/"];
	NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];
	NSURLConnection *testConnection = [[[NSURLConnection alloc] initWithRequest:testRequest delegate:self] autorelease];
	return ((isReachable && !needsConnection) || nonWiFi) ? (testConnection ? YES : NO) : NO;
}

@end

And this is the header Connection.h file:

//
//  Connection.h
//  iBlog
// 
//  Created by Ondrej Rafaj on 12.11.09.
//  Copyright 2009 Home. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>
#import <netinet/in.h>
#import <arpa/inet.h>
#import <netdb.h>

@interface Connection : NSObject {

}

+ (BOOL) isConnected;

@end

And don't forget to include all the necessary frameworks ;) ... SystemConfiguration and libz.1.1.3.dylib