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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/network_change_notifier_mac.h"
#include <netinet/in.h>
#include <resolv.h>
#include "base/basictypes.h"
#include "base/threading/thread.h"
#include "net/dns/dns_config_watcher.h"
#ifndef _PATH_RESCONF // Normally defined in <resolv.h>
#define _PATH_RESCONF "/etc/resolv.conf"
#endif
namespace net {
static bool CalculateReachability(SCNetworkConnectionFlags flags) {
bool reachable = flags & kSCNetworkFlagsReachable;
bool connection_required = flags & kSCNetworkFlagsConnectionRequired;
return reachable && !connection_required;
}
class NetworkChangeNotifierMac::DnsWatcherThread : public base::Thread {
public:
DnsWatcherThread() : base::Thread("NetworkChangeNotifier") {}
virtual ~DnsWatcherThread() {
Stop();
}
virtual void Init() OVERRIDE {
watcher_.Init();
}
virtual void CleanUp() OVERRIDE {
watcher_.CleanUp();
}
private:
internal::DnsConfigWatcher watcher_;
DISALLOW_COPY_AND_ASSIGN(DnsWatcherThread);
};
NetworkChangeNotifierMac::NetworkChangeNotifierMac()
: online_state_(UNINITIALIZED),
initial_state_cv_(&online_state_lock_),
forwarder_(this),
dns_watcher_thread_(new DnsWatcherThread()) {
// Must be initialized after the rest of this object, as it may call back into
// SetInitialState().
config_watcher_.reset(new NetworkConfigWatcherMac(&forwarder_));
dns_watcher_thread_->StartWithOptions(
base::Thread::Options(MessageLoop::TYPE_IO, 0));
}
NetworkChangeNotifierMac::~NetworkChangeNotifierMac() {
// Delete the ConfigWatcher to join the notifier thread, ensuring that
// StartReachabilityNotifications() has an opportunity to run to completion.
config_watcher_.reset();
// Now that StartReachabilityNotifications() has either run to completion or
// never run at all, unschedule reachability_ if it was previously scheduled.
if (reachability_.get() && run_loop_.get()) {
SCNetworkReachabilityUnscheduleFromRunLoop(reachability_.get(),
run_loop_.get(),
kCFRunLoopCommonModes);
}
}
bool NetworkChangeNotifierMac::IsCurrentlyOffline() const {
base::AutoLock lock(online_state_lock_);
// Make sure the initial state is set before returning.
while (online_state_ == UNINITIALIZED) {
initial_state_cv_.Wait();
}
return online_state_ == OFFLINE;
}
void NetworkChangeNotifierMac::SetInitialState() {
// Called on notifier thread.
// Try to reach 0.0.0.0. This is the approach taken by Firefox:
//
// http://mxr.mozilla.org/mozilla2.0/source/netwerk/system/mac/nsNetworkLinkService.mm
//
// From my (adamk) testing on Snow Leopard, 0.0.0.0
// seems to be reachable if any network connection is available.
struct sockaddr_in addr = {0};
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
reachability_.reset(SCNetworkReachabilityCreateWithAddress(
kCFAllocatorDefault, reinterpret_cast<struct sockaddr*>(&addr)));
SCNetworkConnectionFlags flags;
bool reachable = true;
if (SCNetworkReachabilityGetFlags(reachability_, &flags))
reachable = CalculateReachability(flags);
else
LOG(ERROR) << "Could not get initial network state, assuming online.";
{
base::AutoLock lock(online_state_lock_);
online_state_ = reachable ? ONLINE : OFFLINE;
initial_state_cv_.Signal();
}
}
void NetworkChangeNotifierMac::StartReachabilityNotifications() {
// Called on notifier thread.
run_loop_.reset(CFRunLoopGetCurrent());
CFRetain(run_loop_.get());
DCHECK(reachability_);
SCNetworkReachabilityContext reachability_context = {
0, // version
this, // user data
NULL, // retain
NULL, // release
NULL // description
};
if (!SCNetworkReachabilitySetCallback(
reachability_,
&NetworkChangeNotifierMac::ReachabilityCallback,
&reachability_context)) {
LOG(DFATAL) << "Could not set network reachability callback";
reachability_.reset();
} else if (!SCNetworkReachabilityScheduleWithRunLoop(reachability_,
run_loop_,
kCFRunLoopCommonModes)) {
LOG(DFATAL) << "Could not schedule network reachability on run loop";
reachability_.reset();
}
}
void NetworkChangeNotifierMac::SetDynamicStoreNotificationKeys(
SCDynamicStoreRef store) {
base::mac::ScopedCFTypeRef<CFMutableArrayRef> notification_keys(
CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks));
base::mac::ScopedCFTypeRef<CFStringRef> key(
SCDynamicStoreKeyCreateNetworkGlobalEntity(
NULL, kSCDynamicStoreDomainState, kSCEntNetInterface));
CFArrayAppendValue(notification_keys.get(), key.get());
key.reset(SCDynamicStoreKeyCreateNetworkGlobalEntity(
NULL, kSCDynamicStoreDomainState, kSCEntNetIPv4));
CFArrayAppendValue(notification_keys.get(), key.get());
key.reset(SCDynamicStoreKeyCreateNetworkGlobalEntity(
NULL, kSCDynamicStoreDomainState, kSCEntNetIPv6));
CFArrayAppendValue(notification_keys.get(), key.get());
// Set the notification keys. This starts us receiving notifications.
bool ret = SCDynamicStoreSetNotificationKeys(
store, notification_keys.get(), NULL);
// TODO(willchan): Figure out a proper way to handle this rather than crash.
CHECK(ret);
}
void NetworkChangeNotifierMac::OnNetworkConfigChange(CFArrayRef changed_keys) {
DCHECK_EQ(run_loop_.get(), CFRunLoopGetCurrent());
for (CFIndex i = 0; i < CFArrayGetCount(changed_keys); ++i) {
CFStringRef key = static_cast<CFStringRef>(
CFArrayGetValueAtIndex(changed_keys, i));
if (CFStringHasSuffix(key, kSCEntNetIPv4) ||
CFStringHasSuffix(key, kSCEntNetIPv6)) {
NotifyObserversOfIPAddressChange();
return;
}
if (CFStringHasSuffix(key, kSCEntNetInterface)) {
// TODO(willchan): Does not appear to be working. Look into this.
// Perhaps this isn't needed anyway.
} else {
NOTREACHED();
}
}
}
// static
void NetworkChangeNotifierMac::ReachabilityCallback(
SCNetworkReachabilityRef target,
SCNetworkConnectionFlags flags,
void* notifier) {
NetworkChangeNotifierMac* notifier_mac =
static_cast<NetworkChangeNotifierMac*>(notifier);
DCHECK_EQ(notifier_mac->run_loop_.get(), CFRunLoopGetCurrent());
OnlineState new_state = CalculateReachability(flags) ? ONLINE : OFFLINE;
OnlineState old_state;
{
base::AutoLock lock(notifier_mac->online_state_lock_);
old_state = notifier_mac->online_state_;
notifier_mac->online_state_ = new_state;
}
if (old_state != new_state)
NotifyObserversOfOnlineStateChange();
}
} // namespace net
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