Reading sent and received bytes of all sockets in ios - ios

Question

I am new to socket programming.I am trying to track bytes sent and received through all sockets opened in my iPhone. Which data structure present in iOS, gives information about these? I tried below code posted in one of the SO question, but it is giving data from last reboot time. I want to list all sockets established in my iPhone and track bytes sent and received through each socket
- (NSArray *)getDataCounters {
BOOL success;
struct ifaddrs *addrs;
const struct ifaddrs *cursor;
const struct if_data *networkStatisc;
int WiFiSent = 0;
int WiFiReceived = 0;
int WWANSent = 0;
int WWANReceived = 0;
NSString *name=[[[NSString alloc]init]autorelease];
success = getifaddrs(&addrs) == 0;
if (success)
{
cursor = addrs;
while (cursor != NULL)
{
name=[NSString stringWithFormat:#"%s",cursor->ifa_name];
NSLog(#"ifa_name %s == %#\n", cursor->ifa_name,name);
// names of interfaces: en0 is WiFi ,pdp_ip0 is WWAN
if (cursor->ifa_addr->sa_family == AF_LINK)
{
if ([name hasPrefix:#"en"])
{
networkStatisc = (const struct if_data *) cursor->ifa_data;
WiFiSent+=networkStatisc->ifi_obytes;
WiFiReceived+=networkStatisc->ifi_ibytes;
NSLog(#"WiFiSent %d ==%d",WiFiSent,networkStatisc->ifi_obytes);
NSLog(#"WiFiReceived %d ==%d",WiFiReceived,networkStatisc->ifi_ibytes);
}
if ([name hasPrefix:#"pdp_ip"])
{
networkStatisc = (const struct if_data *) cursor->ifa_data;
WWANSent+=networkStatisc->ifi_obytes;
WWANReceived+=networkStatisc->ifi_ibytes;
NSLog(#"WWANSent %d ==%d",WWANSent,networkStatisc->ifi_obytes);
NSLog(#"WWANReceived %d ==%d",WWANReceived,networkStatisc->ifi_ibytes);
}
}
cursor = cursor->ifa_next;
}
freeifaddrs(addrs);
}
return [NSArray arrayWithObjects:[NSNumber numberWithInt:WiFiSent], [NSNumber numberWithInt:WiFiReceived],[NSNumber numberWithInt:WWANSent],[NSNumber numberWithInt:WWANReceived], nil];

Answer 1

I think you should go from basics.
This is how we open socket for input and outputsream.
- (IBAction)searchForSite:(id)sender
{
NSString *urlStr = [sender stringValue];
if (![urlStr isEqualToString:#""]) {
NSURL *website = [NSURL URLWithString:urlStr];
if (!website) {
NSLog(#"%# is not a valid URL");
return;
}
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)[website host], 80, &readStream, &writeStream);
NSInputStream *inputStream = (__bridge_transfer NSInputStream *)readStream;
NSOutputStream *outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
/* Store a reference to the input and output streams so that
they don't go away.... */
...
}
}
this is the delegate method,whick will called every time when you will read or write to socket.
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
switch (streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(#"Stream opened");
break;
case NSStreamEventHasBytesAvailable:
break;
case NSStreamEventHasSpaceAvailable
break;
case NSStreamEventErrorOccurred:
NSLog(#"Can not connect to the host!");
break;
case NSStreamEventEndEncountered:
break;
default:
NSLog(#"Unknown event");
}
}
for more information refer links.
https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Streams/Articles/NetworkStreams.html#//apple_ref/doc/uid/20002277-BCIDFCDI
http://www.raywenderlich.com/3932/networking-tutorial-for-ios-how-to-create-a-socket-based-iphone-app-and-server