transmission/macosx/PortChecker.mm

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// This file Copyright © 2006-2022 Transmission authors and contributors.
// It may be used under the MIT (SPDX: MIT) license.
// License text can be found in the licenses/ folder.
#import "PortChecker.h"
#define CHECKER_URL(port) [NSString stringWithFormat:@"https://portcheck.transmissionbt.com/%ld", port]
#define CHECK_FIRE 3.0
@interface PortChecker ()
@property(nonatomic, weak) NSObject<PortCheckerDelegate>* fDelegate;
@property(nonatomic) port_status_t fStatus;
@property(nonatomic) NSURLConnection* fConnection;
@property(nonatomic) NSMutableData* fPortProbeData;
@property(nonatomic) NSTimer* fTimer;
- (void)startProbe:(NSTimer*)timer;
- (void)callBackWithStatus:(port_status_t)status;
@end
@implementation PortChecker
- (instancetype)initForPort:(NSInteger)portNumber delay:(BOOL)delay withDelegate:(NSObject<PortCheckerDelegate>*)delegate
{
if ((self = [super init]))
{
_fDelegate = delegate;
_fStatus = PORT_STATUS_CHECKING;
_fTimer = [NSTimer scheduledTimerWithTimeInterval:CHECK_FIRE target:self selector:@selector(startProbe:)
userInfo:@(portNumber)
repeats:NO];
if (!delay)
{
[_fTimer fire];
}
}
return self;
}
- (void)dealloc
{
[_fTimer invalidate];
}
- (port_status_t)status
{
return self.fStatus;
}
- (void)cancelProbe
{
[self.fTimer invalidate];
self.fTimer = nil;
[self.fConnection cancel];
}
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response
{
self.fPortProbeData.length = 0;
}
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
[self.fPortProbeData appendData:data];
}
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
NSLog(@"Unable to get port status: connection failed (%@)", error.localizedDescription);
[self callBackWithStatus:PORT_STATUS_ERROR];
}
- (void)connectionDidFinishLoading:(NSURLConnection*)connection
{
NSString* probeString = [[NSString alloc] initWithData:self.fPortProbeData encoding:NSUTF8StringEncoding];
self.fPortProbeData = nil;
if (probeString)
{
if ([probeString isEqualToString:@"1"])
{
[self callBackWithStatus:PORT_STATUS_OPEN];
}
else if ([probeString isEqualToString:@"0"])
{
[self callBackWithStatus:PORT_STATUS_CLOSED];
}
else
{
NSLog(@"Unable to get port status: invalid response (%@)", probeString);
[self callBackWithStatus:PORT_STATUS_ERROR];
}
}
else
{
NSLog(@"Unable to get port status: invalid data received");
[self callBackWithStatus:PORT_STATUS_ERROR];
}
}
#pragma mark - Private
- (void)startProbe:(NSTimer*)timer
{
self.fTimer = nil;
NSURLRequest* portProbeRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:CHECKER_URL([[timer userInfo] integerValue])]
cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
timeoutInterval:15.0];
if ((self.fConnection = [[NSURLConnection alloc] initWithRequest:portProbeRequest delegate:self]))
{
self.fPortProbeData = [[NSMutableData alloc] init];
}
else
{
NSLog(@"Unable to get port status: failed to initiate connection");
[self callBackWithStatus:PORT_STATUS_ERROR];
}
}
- (void)callBackWithStatus:(port_status_t)status
{
self.fStatus = status;
if (self.fDelegate && [self.fDelegate respondsToSelector:@selector(portCheckerDidFinishProbing:)])
{
[self.fDelegate performSelectorOnMainThread:@selector(portCheckerDidFinishProbing:) withObject:self waitUntilDone:NO];
}
}
@end