transmission/macosx/PortChecker.m

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2006 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#import "PortChecker.h"
#import "transmission.h"
@implementation PortChecker
- (id) initWithDelegate: (id) delegate
{
if ((self = [super init]))
{
fDelegate = delegate;
}
return self;
}
- (port_status_t) status
{
return fStatus;
}
- (void) probePort: (int) portNumber
{
NSURLRequest * portProbeRequest = [NSURLRequest requestWithURL: [NSURL URLWithString:
[NSString stringWithFormat: @"https://www.grc.com/x/portprobe=%d", portNumber]]
cachePolicy: NSURLRequestReloadIgnoringCacheData timeoutInterval: 15.0];
NSURLConnection * portProbeConnection;
if ((portProbeConnection = [NSURLConnection connectionWithRequest: portProbeRequest delegate: self]))
fPortProbeData = [[NSMutableData data] retain];
else
{
NSLog(@"Unable to get port status: failed to initiate connection");
[self callBackWithStatus: PORT_STATUS_ERROR];
}
}
- (void) callBackWithStatus: (port_status_t) status
{
fStatus = status;
if (fDelegate && [fDelegate respondsToSelector: @selector(portCheckerDidFinishProbing:)])
[fDelegate portCheckerDidFinishProbing: self];
}
#pragma mark NSURLConnection delegate methods
- (void) connection: (NSURLConnection *) connection didReceiveResponse: (NSURLResponse *) response
{
[fPortProbeData setLength: 0];
}
- (void) connection: (NSURLConnection *) connection didReceiveData: (NSData *) data
{
[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];
[fPortProbeData release];
}
- (void) connectionDidFinishLoading: (NSURLConnection *) connection
{
NSXMLDocument * shieldsUpProbe = [[NSXMLDocument alloc] initWithData: fPortProbeData
options: NSXMLDocumentTidyHTML error: nil];
if (shieldsUpProbe)
{
NSArray * nodes = [shieldsUpProbe nodesForXPath: @"/html/body/center/table[3]/tr/td[2]" error: nil];
if ([nodes count] != 1)
{
NSArray * title = [shieldsUpProbe nodesForXPath: @"/html/head/title" error: nil];
// This may happen when we probe twice too quickly
if ([title count] > 1 || ![[[title objectAtIndex: 0] stringValue] isEqualToString:
@"NanoProbe System Already In Use"])
{
NSLog(@"Unable to get port status: invalid (outdated) XPath expression");
[[shieldsUpProbe XMLData] writeToFile: @"/tmp/shieldsUpProbe.html" atomically: YES];
[self callBackWithStatus: PORT_STATUS_ERROR];
}
}
else
{
NSString * portStatus = [[[[nodes objectAtIndex: 0] stringValue] stringByTrimmingCharactersInSet:
[[NSCharacterSet letterCharacterSet] invertedSet]] lowercaseString];
if ([portStatus isEqualToString: @"open"])
[self callBackWithStatus: PORT_STATUS_OPEN];
else if ([portStatus isEqualToString: @"stealth"])
[self callBackWithStatus: PORT_STATUS_STEALTH];
else if ([portStatus isEqualToString: @"closed"])
[self callBackWithStatus: PORT_STATUS_CLOSED];
else {
NSLog(@"Unable to get port status: unknown port state");
[self callBackWithStatus: PORT_STATUS_ERROR];
}
}
}
else
{
NSLog(@"Unable to get port status: failed to create xml document");
[self callBackWithStatus: PORT_STATUS_ERROR];
}
[fPortProbeData release];
}
@end