freerdp/client/iOS/Misc/Reachability.m

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/*
File: Reachability.m
Abstract: Basic demonstration of how to use the SystemConfiguration Reachablity APIs.
Version: 2.2
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*/
#import <sys/socket.h>
#import <netinet/in.h>
#import <netinet6/in6.h>
#import <arpa/inet.h>
#import <ifaddrs.h>
#import <netdb.h>
#import <CoreFoundation/CoreFoundation.h>
#import "Reachability.h"
#define kShouldPrintReachabilityFlags 1
static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char *comment)
{
#if kShouldPrintReachabilityFlags
NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n",
(flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',
(flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-',
(flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-',
(flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-',
(flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-',
(flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-', comment);
#endif
}
@implementation Reachability
static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags,
void *info)
{
#pragma unused(target, flags)
NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback");
NSCAssert([(NSObject *)info isKindOfClass:[Reachability class]],
@"info was wrong class in ReachabilityCallback");
// We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively
// in case someon uses the Reachablity object in a different thread.
NSAutoreleasePool *myPool = [[NSAutoreleasePool alloc] init];
Reachability *noteObject = (Reachability *)info;
// Post a notification to notify the client that the network reachability changed.
[[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification
object:noteObject];
[myPool release];
}
- (BOOL)startNotifier
{
BOOL retVal = NO;
SCNetworkReachabilityContext context = { 0, self, NULL, NULL, NULL };
if (SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context))
{
if (SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(),
kCFRunLoopDefaultMode))
{
retVal = YES;
}
}
return retVal;
}
- (void)stopNotifier
{
if (reachabilityRef != NULL)
{
SCNetworkReachabilityUnscheduleFromRunLoop(reachabilityRef, CFRunLoopGetCurrent(),
kCFRunLoopDefaultMode);
}
}
- (void)dealloc
{
[self stopNotifier];
if (reachabilityRef != NULL)
{
CFRelease(reachabilityRef);
}
[super dealloc];
}
+ (Reachability *)reachabilityWithHostName:(NSString *)hostName;
{
Reachability *retVal = NULL;
SCNetworkReachabilityRef reachability =
SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
if (reachability != NULL)
{
retVal = [[[self alloc] init] autorelease];
if (retVal != NULL)
{
retVal->reachabilityRef = reachability;
retVal->localWiFiRef = NO;
}
}
return retVal;
}
+ (Reachability *)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress;
{
SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(
kCFAllocatorDefault, (const struct sockaddr *)hostAddress);
Reachability *retVal = NULL;
if (reachability != NULL)
{
retVal = [[[self alloc] init] autorelease];
if (retVal != NULL)
{
retVal->reachabilityRef = reachability;
retVal->localWiFiRef = NO;
}
}
return retVal;
}
+ (Reachability *)reachabilityForInternetConnection;
{
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
return [self reachabilityWithAddress:&zeroAddress];
}
+ (Reachability *)reachabilityForLocalWiFi;
{
struct sockaddr_in localWifiAddress;
bzero(&localWifiAddress, sizeof(localWifiAddress));
localWifiAddress.sin_len = sizeof(localWifiAddress);
localWifiAddress.sin_family = AF_INET;
// IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0
localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM);
Reachability *retVal = [self reachabilityWithAddress:&localWifiAddress];
if (retVal != NULL)
{
retVal->localWiFiRef = YES;
}
return retVal;
}
#pragma mark Network Flag Handling
- (NetworkStatus)localWiFiStatusForFlags:(SCNetworkReachabilityFlags)flags
{
PrintReachabilityFlags(flags, "localWiFiStatusForFlags");
BOOL retVal = NotReachable;
if ((flags & kSCNetworkReachabilityFlagsReachable) &&
(flags & kSCNetworkReachabilityFlagsIsDirect))
{
retVal = ReachableViaWiFi;
}
return retVal;
}
- (NetworkStatus)networkStatusForFlags:(SCNetworkReachabilityFlags)flags
{
PrintReachabilityFlags(flags, "networkStatusForFlags");
if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
{
// if target host is not reachable
return NotReachable;
}
BOOL retVal = NotReachable;
if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
{
// if target host is reachable and no connection is required
// then we'll assume (for now) that your on Wi-Fi
retVal = ReachableViaWiFi;
}
if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand) != 0) ||
(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
{
// ... and the connection is on-demand (or on-traffic) if the
// calling application is using the CFSocketStream or higher APIs
if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
{
// ... and no [user] intervention is needed
retVal = ReachableViaWiFi;
}
}
if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
{
// ... but WWAN connections are OK if the calling application
// is using the CFNetwork (CFSocketStream?) APIs.
retVal = ReachableViaWWAN;
}
return retVal;
}
- (BOOL)connectionRequired;
{
NSAssert(reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef");
SCNetworkReachabilityFlags flags;
if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
{
return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
}
return NO;
}
- (NetworkStatus)currentReachabilityStatus
{
NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef");
NetworkStatus retVal = NotReachable;
SCNetworkReachabilityFlags flags;
if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
{
if (localWiFiRef)
{
retVal = [self localWiFiStatusForFlags:flags];
}
else
{
retVal = [self networkStatusForFlags:flags];
}
}
return retVal;
}
@end