source: trunk/macosx/PortChecker.m @ 1125

Last change on this file since 1125 was 1106, checked in by livings124, 15 years ago

patch to PortChecker? to make it more reusable

File size: 5.1 KB
Line 
1/******************************************************************************
2 * $Id$
3 *
4 * Copyright (c) 2005-2006 Transmission authors and contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *****************************************************************************/
24
25#import "PortChecker.h"
26
27@implementation PortChecker
28
29- (id) initWithDelegate: (id) delegate
30{
31    if ((self = [super init]))
32    {
33        fDelegate = delegate;
34    }
35   
36    return self;
37}
38
39- (port_status_t) status
40{
41    return fStatus;
42}
43
44- (void) probePort: (int) portNumber
45{
46    NSURLRequest * portProbeRequest = [NSURLRequest requestWithURL: [NSURL URLWithString:
47                                [NSString stringWithFormat: @"https://www.grc.com/x/portprobe=%d", portNumber]]
48                                cachePolicy: NSURLRequestReloadIgnoringCacheData timeoutInterval: 15.0];
49   
50    NSURLConnection * portProbeConnection;
51    if ((portProbeConnection = [NSURLConnection connectionWithRequest: portProbeRequest delegate: self]))
52        fPortProbeData = [[NSMutableData data] retain];
53    else
54    {
55        NSLog(@"Unable to get port status: failed to initiate connection");
56        [self callBackWithStatus: PORT_STATUS_ERROR];
57    }
58}
59
60- (void) callBackWithStatus: (port_status_t) status
61{
62    fStatus = status;
63   
64    if (fDelegate && [fDelegate respondsToSelector: @selector(portCheckerDidFinishProbing:)])
65        [fDelegate performSelectorOnMainThread: @selector(portCheckerDidFinishProbing:) withObject: self waitUntilDone: NO];
66}
67
68#pragma mark NSURLConnection delegate methods
69
70- (void) connection: (NSURLConnection *) connection didReceiveResponse: (NSURLResponse *) response
71{
72    [fPortProbeData setLength: 0];
73}
74
75- (void) connection: (NSURLConnection *) connection didReceiveData: (NSData *) data
76{
77    [fPortProbeData appendData: data];
78}
79
80- (void) connection: (NSURLConnection *) connection didFailWithError: (NSError *) error
81{
82    NSLog(@"Unable to get port status: connection failed (%@)", [error localizedDescription]);
83    [self callBackWithStatus: PORT_STATUS_ERROR];
84    [fPortProbeData release];
85}
86
87- (void) connectionDidFinishLoading: (NSURLConnection *) connection
88{
89    NSXMLDocument * shieldsUpProbe = [[NSXMLDocument alloc] initWithData: fPortProbeData
90                                        options: NSXMLDocumentTidyHTML error: nil];
91   
92    if (shieldsUpProbe)
93    {
94        NSArray * nodes = [shieldsUpProbe nodesForXPath: @"/html/body/center/table[3]/tr/td[2]" error: nil];
95        if ([nodes count] != 1)
96        {
97            NSArray * title = [shieldsUpProbe nodesForXPath: @"/html/head/title" error: nil];
98            // This may happen when we probe twice too quickly
99            if ([title count] != 1 || ![[[title objectAtIndex: 0] stringValue] isEqualToString:
100                                                                    @"NanoProbe System Already In Use"])
101            {
102                NSLog(@"Unable to get port status: invalid (outdated) XPath expression");
103                [[shieldsUpProbe XMLData] writeToFile: @"/tmp/shieldsUpProbe.html" atomically: YES];
104                [self callBackWithStatus: PORT_STATUS_ERROR];
105            }
106        }
107        else
108        {
109            NSString * portStatus = [[[[nodes objectAtIndex: 0] stringValue] stringByTrimmingCharactersInSet:
110                                                [[NSCharacterSet letterCharacterSet] invertedSet]] lowercaseString];
111           
112            if ([portStatus isEqualToString: @"open"])
113                [self callBackWithStatus: PORT_STATUS_OPEN];
114            else if ([portStatus isEqualToString: @"stealth"])
115                [self callBackWithStatus: PORT_STATUS_STEALTH];
116            else if ([portStatus isEqualToString: @"closed"])
117                [self callBackWithStatus: PORT_STATUS_CLOSED];
118            else
119            {
120                NSLog(@"Unable to get port status: unknown port state");
121                [self callBackWithStatus: PORT_STATUS_ERROR];
122            }
123        }
124    }
125    else
126    {
127        NSLog(@"Unable to get port status: failed to create xml document");
128        [self callBackWithStatus: PORT_STATUS_ERROR];
129    }
130
131    [fPortProbeData release];
132}
133
134@end
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