-
Notifications
You must be signed in to change notification settings - Fork 0
/
Reachability.m
477 lines (376 loc) · 13.1 KB
/
Reachability.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
/*
Copyright (c) 2011, Tony Million.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#import "Reachability.h"
#import <sys/socket.h>
#import <netinet/in.h>
#import <netinet6/in6.h>
#import <arpa/inet.h>
#import <ifaddrs.h>
#import <netdb.h>
NSString *const kReachabilityChangedNotification = @"kReachabilityChangedNotification";
@interface Reachability ()
@property (nonatomic, assign) SCNetworkReachabilityRef reachabilityRef;
@property (nonatomic, strong) dispatch_queue_t reachabilitySerialQueue;
@property (nonatomic, strong) id reachabilityObject;
-(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags;
-(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags;
@end
static NSString *reachabilityFlags(SCNetworkReachabilityFlags flags)
{
return [NSString stringWithFormat:@"%c%c %c%c%c%c%c%c%c",
#if TARGET_OS_IPHONE
(flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',
#else
'X',
#endif
(flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-',
(flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-',
(flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-',
(flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-',
(flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-',
(flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-'];
}
// Start listening for reachability notifications on the current run loop
static void TMReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
{
#pragma unused (target)
Reachability *reachability = ((__bridge Reachability*)info);
// We probably don't need an autoreleasepool here, as GCD docs state each queue has its own autorelease pool,
// but what the heck eh?
@autoreleasepool
{
[reachability reachabilityChanged:flags];
}
}
@implementation Reachability
#pragma mark - Class Constructor Methods
+(instancetype)reachabilityWithHostName:(NSString*)hostname
{
return [Reachability reachabilityWithHostname:hostname];
}
+(instancetype)reachabilityWithHostname:(NSString*)hostname
{
SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(NULL, [hostname UTF8String]);
if (ref)
{
id reachability = [[self alloc] initWithReachabilityRef:ref];
return reachability;
}
return nil;
}
+(instancetype)reachabilityWithAddress:(void *)hostAddress
{
SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
if (ref)
{
id reachability = [[self alloc] initWithReachabilityRef:ref];
return reachability;
}
return nil;
}
+(instancetype)reachabilityForInternetConnection
{
struct sockaddr_in zeroAddress;
bzero(&zeroAddress, sizeof(zeroAddress));
zeroAddress.sin_len = sizeof(zeroAddress);
zeroAddress.sin_family = AF_INET;
return [self reachabilityWithAddress:&zeroAddress];
}
+(instancetype)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);
return [self reachabilityWithAddress:&localWifiAddress];
}
// Initialization methods
-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref
{
self = [super init];
if (self != nil)
{
self.reachableOnWWAN = YES;
self.reachabilityRef = ref;
// We need to create a serial queue.
// We allocate this once for the lifetime of the notifier.
self.reachabilitySerialQueue = dispatch_queue_create("com.tonymillion.reachability", NULL);
}
return self;
}
-(void)dealloc
{
[self stopNotifier];
if(self.reachabilityRef)
{
CFRelease(self.reachabilityRef);
self.reachabilityRef = nil;
}
self.reachableBlock = nil;
self.unreachableBlock = nil;
self.reachabilityBlock = nil;
self.reachabilitySerialQueue = nil;
[super dealloc];
}
#pragma mark - Notifier Methods
// Notifier
// NOTE: This uses GCD to trigger the blocks - they *WILL NOT* be called on THE MAIN THREAD
// - In other words DO NOT DO ANY UI UPDATES IN THE BLOCKS.
// INSTEAD USE dispatch_async(dispatch_get_main_queue(), ^{UISTUFF}) (or dispatch_sync if you want)
-(BOOL)startNotifier
{
// allow start notifier to be called multiple times
if(self.reachabilityObject && (self.reachabilityObject == self))
{
return YES;
}
SCNetworkReachabilityContext context = { 0, NULL, NULL, NULL, NULL };
context.info = (__bridge void *)self;
if(SCNetworkReachabilitySetCallback(self.reachabilityRef, TMReachabilityCallback, &context))
{
// Set it as our reachability queue, which will retain the queue
if(SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, self.reachabilitySerialQueue))
{
// this should do a retain on ourself, so as long as we're in notifier mode we shouldn't disappear out from under ourselves
// woah
self.reachabilityObject = self;
return YES;
}
else
{
#ifdef DEBUG
NSLog(@"SCNetworkReachabilitySetDispatchQueue() failed: %s", SCErrorString(SCError()));
#endif
// UH OH - FAILURE - stop any callbacks!
SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
}
}
else
{
#ifdef DEBUG
NSLog(@"SCNetworkReachabilitySetCallback() failed: %s", SCErrorString(SCError()));
#endif
}
// if we get here we fail at the internet
self.reachabilityObject = nil;
return NO;
}
-(void)stopNotifier
{
// First stop, any callbacks!
SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
// Unregister target from the GCD serial dispatch queue.
SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, NULL);
self.reachabilityObject = nil;
}
#pragma mark - reachability tests
// This is for the case where you flick the airplane mode;
// you end up getting something like this:
//Reachability: WR ct-----
//Reachability: -- -------
//Reachability: WR ct-----
//Reachability: -- -------
// We treat this as 4 UNREACHABLE triggers - really apple should do better than this
#define testcase (kSCNetworkReachabilityFlagsConnectionRequired | kSCNetworkReachabilityFlagsTransientConnection)
-(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags
{
BOOL connectionUP = YES;
if(!(flags & kSCNetworkReachabilityFlagsReachable))
connectionUP = NO;
if( (flags & testcase) == testcase )
connectionUP = NO;
#if TARGET_OS_IPHONE
if(flags & kSCNetworkReachabilityFlagsIsWWAN)
{
// We're on 3G.
if(!self.reachableOnWWAN)
{
// We don't want to connect when on 3G.
connectionUP = NO;
}
}
#endif
return connectionUP;
}
-(BOOL)isReachable
{
SCNetworkReachabilityFlags flags;
if(!SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
return NO;
return [self isReachableWithFlags:flags];
}
-(BOOL)isReachableViaWWAN
{
#if TARGET_OS_IPHONE
SCNetworkReachabilityFlags flags = 0;
if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
// Check we're REACHABLE
if(flags & kSCNetworkReachabilityFlagsReachable)
{
// Now, check we're on WWAN
if(flags & kSCNetworkReachabilityFlagsIsWWAN)
{
return YES;
}
}
}
#endif
return NO;
}
-(BOOL)isReachableViaWiFi
{
SCNetworkReachabilityFlags flags = 0;
if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
// Check we're reachable
if((flags & kSCNetworkReachabilityFlagsReachable))
{
#if TARGET_OS_IPHONE
// Check we're NOT on WWAN
if((flags & kSCNetworkReachabilityFlagsIsWWAN))
{
return NO;
}
#endif
return YES;
}
}
return NO;
}
// WWAN may be available, but not active until a connection has been established.
// WiFi may require a connection for VPN on Demand.
-(BOOL)isConnectionRequired
{
return [self connectionRequired];
}
-(BOOL)connectionRequired
{
SCNetworkReachabilityFlags flags;
if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
}
return NO;
}
// Dynamic, on demand connection?
-(BOOL)isConnectionOnDemand
{
SCNetworkReachabilityFlags flags;
if (SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) &&
(flags & (kSCNetworkReachabilityFlagsConnectionOnTraffic | kSCNetworkReachabilityFlagsConnectionOnDemand)));
}
return NO;
}
// Is user intervention required?
-(BOOL)isInterventionRequired
{
SCNetworkReachabilityFlags flags;
if (SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
return ((flags & kSCNetworkReachabilityFlagsConnectionRequired) &&
(flags & kSCNetworkReachabilityFlagsInterventionRequired));
}
return NO;
}
#pragma mark - reachability status stuff
-(NetworkStatus)currentReachabilityStatus
{
if([self isReachable])
{
if([self isReachableViaWiFi])
return ReachableViaWiFi;
#if TARGET_OS_IPHONE
return ReachableViaWWAN;
#endif
}
return NotReachable;
}
-(SCNetworkReachabilityFlags)reachabilityFlags
{
SCNetworkReachabilityFlags flags = 0;
if(SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
{
return flags;
}
return 0;
}
-(NSString*)currentReachabilityString
{
NetworkStatus temp = [self currentReachabilityStatus];
if(temp == ReachableViaWWAN)
{
// Updated for the fact that we have CDMA phones now!
return NSLocalizedString(@"Cellular", @"");
}
if (temp == ReachableViaWiFi)
{
return NSLocalizedString(@"WiFi", @"");
}
return NSLocalizedString(@"No Connection", @"");
}
-(NSString*)currentReachabilityFlags
{
return reachabilityFlags([self reachabilityFlags]);
}
#pragma mark - Callback function calls this method
-(void)reachabilityChanged:(SCNetworkReachabilityFlags)flags
{
if([self isReachableWithFlags:flags])
{
if(self.reachableBlock)
{
self.reachableBlock(self);
}
}
else
{
if(self.unreachableBlock)
{
self.unreachableBlock(self);
}
}
if(self.reachabilityBlock)
{
self.reachabilityBlock(self, flags);
}
// this makes sure the change notification happens on the MAIN THREAD
dispatch_async(dispatch_get_main_queue(), ^{
[[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification
object:self];
});
}
#pragma mark - Debug Description
- (NSString *) description
{
NSString *description = [NSString stringWithFormat:@"<%@: %#x (%@)>",
NSStringFromClass([self class]), (unsigned int) self, [self currentReachabilityFlags]];
return description;
}
@end