Monitoring for IP address changes

gistfile1.m

#import "NetworkMonitor.h"

NSString *NetworkConfigurationDidChangeNotification = @"NetworkConfigurationDidChangeNotification";

void storeCallback(SCDynamicStoreRef store, CFArrayRef changedKeys, void *info) {
	[(NetworkMonitor *)info update];
}

@implementation NetworkMonitor

@synthesize addresses;
@synthesize computerName;

- (id)init {
	if (self = [super init]) {
		ipv4Pattern = (NSString *)SCDynamicStoreKeyCreateNetworkServiceEntity(NULL,
								  kSCDynamicStoreDomainState,
								  kSCCompAnyRegex,
								  kSCEntNetIPv4);

		ipv6Pattern = (NSString *)SCDynamicStoreKeyCreateNetworkServiceEntity(NULL,
								  kSCDynamicStoreDomainState,
								  kSCCompAnyRegex,
								  kSCEntNetIPv6);

		computerNamePattern = (NSString *)SCDynamicStoreKeyCreateComputerName(NULL);

		return self;
	} else {
		return nil;
	}
}

- (void)dealloc {
	[ipv4Pattern release];
	[ipv6Pattern release];
	[computerNamePattern release];
	self.addresses = nil;
	self.computerName = nil;
	CFRelease(store);
	[super dealloc];
}

- (void)startMonitoring {
	SCDynamicStoreContext context;
	memset(&context, 0, sizeof(context));
	context.info = self;

	store = SCDynamicStoreCreate(NULL, CFSTR("NetworkMonitor"), storeCallback, &context);
	if (store == NULL) {
		// The horror!
		return;
	}

	[self update];

	NSArray *patterns = [NSArray arrayWithObjects:ipv4Pattern, ipv6Pattern, computerNamePattern, nil];
	if (!SCDynamicStoreSetNotificationKeys(store, NULL, (CFArrayRef)patterns)) {
		// More horror!
	}

	SCDynamicStoreSetDispatchQueue(store, dispatch_get_main_queue());
}

- (void)update {
	NSMutableArray *newAddresses = [NSMutableArray array];

	NSArray *patterns = [NSArray arrayWithObject:ipv4Pattern];
	NSDictionary *info = [(NSDictionary *)SCDynamicStoreCopyMultiple(store, NULL, (CFArrayRef)patterns) autorelease];

	[info enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
		NSArray *serviceAddresses = [obj objectForKey:(NSString *)kSCPropNetIPv4Addresses];
		[newAddresses addObjectsFromArray:serviceAddresses];
	}];

	self.addresses = newAddresses;
	self.computerName = [(NSString *)SCDynamicStoreCopyComputerName(NULL, NULL) autorelease];
	[[NSNotificationCenter defaultCenter] postNotificationName:NetworkConfigurationDidChangeNotification object:self];
}

@end

Hey, I know this is super late but can you share the header file for this? Thanks!