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/*
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* Copyright 2019 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "GoogleDataTransport/GDTCORLibrary/Internal/GDTCORReachability.h"
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#import "GoogleDataTransport/GDTCORLibrary/Private/GDTCORReachability_Private.h"
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#import "GoogleDataTransport/GDTCORLibrary/Public/GoogleDataTransport/GDTCORConsoleLogger.h"
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#import <netinet/in.h>
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/** Sets the _callbackFlag ivar whenever the network changes.
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*
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* @param reachability The reachability object calling back.
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* @param flags The new flag values.
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* @param info Any data that might be passed in by the callback.
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*/
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static void GDTCORReachabilityCallback(GDTCORNetworkReachabilityRef reachability,
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GDTCORNetworkReachabilityFlags flags,
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void *info);
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@implementation GDTCORReachability {
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/** The reachability object. */
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GDTCORNetworkReachabilityRef _reachabilityRef;
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/** The queue on which callbacks and all work will occur. */
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dispatch_queue_t _reachabilityQueue;
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/** Flags specified by reachability callbacks. */
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GDTCORNetworkReachabilityFlags _callbackFlags;
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}
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+ (void)initialize {
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[self sharedInstance];
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}
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+ (instancetype)sharedInstance {
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static GDTCORReachability *sharedInstance;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedInstance = [[GDTCORReachability alloc] init];
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});
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return sharedInstance;
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}
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+ (GDTCORNetworkReachabilityFlags)currentFlags {
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__block GDTCORNetworkReachabilityFlags currentFlags;
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#if !TARGET_OS_WATCH
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dispatch_sync([GDTCORReachability sharedInstance] -> _reachabilityQueue, ^{
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GDTCORReachability *reachability = [GDTCORReachability sharedInstance];
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currentFlags =
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reachability->_callbackFlags ? reachability->_callbackFlags : reachability->_flags;
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GDTCORLogDebug(@"Initial reachability flags determined: %d", currentFlags);
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});
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#else
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currentFlags = kGDTCORNetworkReachabilityFlagsReachable;
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#endif
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return currentFlags;
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}
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- (instancetype)init {
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self = [super init];
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#if !TARGET_OS_WATCH
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if (self) {
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struct sockaddr_in zeroAddress;
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bzero(&zeroAddress, sizeof(zeroAddress));
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zeroAddress.sin_len = sizeof(zeroAddress);
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zeroAddress.sin_family = AF_INET;
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_reachabilityQueue =
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dispatch_queue_create("com.google.GDTCORReachability", DISPATCH_QUEUE_SERIAL);
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_reachabilityRef = SCNetworkReachabilityCreateWithAddress(
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kCFAllocatorDefault, (const struct sockaddr *)&zeroAddress);
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Boolean success = SCNetworkReachabilitySetDispatchQueue(_reachabilityRef, _reachabilityQueue);
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if (!success) {
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GDTCORLogWarning(GDTCORMCWReachabilityFailed, @"%@", @"The reachability queue wasn't set.");
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}
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success = SCNetworkReachabilitySetCallback(_reachabilityRef, GDTCORReachabilityCallback, NULL);
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if (!success) {
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GDTCORLogWarning(GDTCORMCWReachabilityFailed, @"%@",
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@"The reachability callback wasn't set.");
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}
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// Get the initial set of flags.
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dispatch_async(_reachabilityQueue, ^{
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Boolean valid = SCNetworkReachabilityGetFlags(self->_reachabilityRef, &self->_flags);
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if (!valid) {
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GDTCORLogDebug(@"%@", @"Determining reachability failed.");
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self->_flags = 0;
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}
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});
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}
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#endif
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return self;
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}
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- (void)setCallbackFlags:(GDTCORNetworkReachabilityFlags)flags {
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if (_callbackFlags != flags) {
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self->_callbackFlags = flags;
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}
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}
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@end
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-function"
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static void GDTCORReachabilityCallback(GDTCORNetworkReachabilityRef reachability,
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GDTCORNetworkReachabilityFlags flags,
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void *info) {
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#pragma clang diagnostic pop
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GDTCORLogDebug(@"Reachability changed, new flags: %d", flags);
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[[GDTCORReachability sharedInstance] setCallbackFlags:flags];
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}
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