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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 <string>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/network/network_change_notifier_chromeos.h"
#include "chromeos/network/network_event_log.h"
#include "chromeos/network/network_state.h"
#include "chromeos/network/network_state_handler.h"
#include "net/base/network_change_notifier.h"
#include "net/dns/dns_config_service_posix.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
// DNS config services on Chrome OS are signalled by the network state handler
// rather than relying on watching files in /etc.
class NetworkChangeNotifierChromeos::DnsConfigService
: public net::internal::DnsConfigServicePosix {
public:
DnsConfigService();
virtual ~DnsConfigService();
// net::internal::DnsConfigService() overrides.
virtual bool StartWatching() OVERRIDE;
virtual void OnNetworkChange();
};
NetworkChangeNotifierChromeos::DnsConfigService::DnsConfigService() {
}
NetworkChangeNotifierChromeos::DnsConfigService::~DnsConfigService() {
}
bool NetworkChangeNotifierChromeos::DnsConfigService::StartWatching() {
// DNS config changes are handled and notified by the network state handlers.
return true;
}
void NetworkChangeNotifierChromeos::DnsConfigService::OnNetworkChange() {
InvalidateConfig();
InvalidateHosts();
ReadNow();
}
NetworkChangeNotifierChromeos::NetworkChangeNotifierChromeos()
: NetworkChangeNotifier(NetworkChangeCalculatorParamsChromeos()),
connection_type_(CONNECTION_NONE) {
}
NetworkChangeNotifierChromeos::~NetworkChangeNotifierChromeos() {
}
void NetworkChangeNotifierChromeos::Initialize() {
DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
NetworkHandler::Get()->network_state_handler()->AddObserver(this, FROM_HERE);
dns_config_service_.reset(new DnsConfigService());
dns_config_service_->WatchConfig(
base::Bind(net::NetworkChangeNotifier::SetDnsConfig));
// Update initial connection state.
DefaultNetworkChanged(
NetworkHandler::Get()->network_state_handler()->DefaultNetwork());
}
void NetworkChangeNotifierChromeos::Shutdown() {
dns_config_service_.reset();
NetworkHandler::Get()->network_state_handler()->RemoveObserver(
this, FROM_HERE);
DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
}
net::NetworkChangeNotifier::ConnectionType
NetworkChangeNotifierChromeos::GetCurrentConnectionType() const {
return connection_type_;
}
void NetworkChangeNotifierChromeos::SystemResumed(
const base::TimeDelta& sleep_duration) {
// Force invalidation of network resources on resume.
NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
}
void NetworkChangeNotifierChromeos::DefaultNetworkChanged(
const chromeos::NetworkState* default_network) {
bool connection_type_changed = false;
bool ip_address_changed = false;
bool dns_changed = false;
UpdateState(default_network, &connection_type_changed,
&ip_address_changed, &dns_changed);
if (connection_type_changed)
NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
if (ip_address_changed)
NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
if (dns_changed)
dns_config_service_->OnNetworkChange();
}
void NetworkChangeNotifierChromeos::UpdateState(
const chromeos::NetworkState* default_network,
bool* connection_type_changed,
bool* ip_address_changed,
bool* dns_changed) {
*connection_type_changed = false;
*ip_address_changed = false;
*dns_changed = false;
if (!default_network || !default_network->IsConnectedState()) {
// If we lost a default network, we must update our state and notify
// observers, otherwise we have nothing to do. (Under normal circumstances,
// we should never get duplicate no default network notifications).
if (connection_type_ != CONNECTION_NONE) {
NET_LOG_EVENT("NCNDefaultNetworkLost", service_path_);
*ip_address_changed = true;
*dns_changed = true;
*connection_type_changed = true;
connection_type_ = CONNECTION_NONE;
service_path_.clear();
ip_address_.clear();
dns_servers_.clear();
}
return;
}
// We do have a default network and it is connected.
net::NetworkChangeNotifier::ConnectionType new_connection_type =
ConnectionTypeFromShill(default_network->type(),
default_network->technology());
if (new_connection_type != connection_type_) {
NET_LOG_EVENT(
"NCNDefaultConnectionTypeChanged",
base::StringPrintf("%s -> %s",
ConnectionTypeToString(connection_type_),
ConnectionTypeToString(new_connection_type)));
*connection_type_changed = true;
}
if (default_network->path() != service_path_) {
NET_LOG_EVENT(
"NCNDefaultNetworkServicePathChanged",
base::StringPrintf("%s -> %s",
service_path_.c_str(),
default_network->path().c_str()));
// If we had a default network service change, network resources
// must always be invalidated.
*ip_address_changed = true;
*dns_changed = true;
}
if (default_network->ip_address() != ip_address_) {
// Is this a state update with an online->online transition?
bool stayed_online = (!*connection_type_changed &&
connection_type_ != CONNECTION_NONE);
bool is_suppressed = true;
// Suppress IP address change signalling on online->online transitions
// when getting an IP address update for the first time.
if (!(stayed_online && ip_address_.empty())) {
is_suppressed = false;
*ip_address_changed = true;
}
NET_LOG_EVENT(
base::StringPrintf("%s%s",
"NCNDefaultIPAddressChanged",
is_suppressed ? " (Suppressed)" : "" ),
base::StringPrintf("%s -> %s",
ip_address_.c_str(),
default_network->ip_address().c_str()));
}
if (default_network->dns_servers() != dns_servers_) {
NET_LOG_EVENT(
"NCNDefaultDNSServerChanged",
base::StringPrintf(
"%s -> %s",
JoinString(dns_servers_, ",").c_str(),
JoinString(default_network->dns_servers(), ",").c_str()));
*dns_changed = true;
}
connection_type_ = new_connection_type;
service_path_ = default_network->path();
ip_address_ = default_network->ip_address();
dns_servers_ = default_network->dns_servers();
}
// static
net::NetworkChangeNotifier::ConnectionType
NetworkChangeNotifierChromeos::ConnectionTypeFromShill(
const std::string& type, const std::string& technology) {
if (type == flimflam::kTypeEthernet)
return CONNECTION_ETHERNET;
else if (type == flimflam::kTypeWifi)
return CONNECTION_WIFI;
else if (type == flimflam::kTypeWimax)
return CONNECTION_4G;
if (type != flimflam::kTypeCellular)
return CONNECTION_UNKNOWN;
// For cellular types, mapping depends on the technology.
if (technology == flimflam::kNetworkTechnologyEvdo ||
technology == flimflam::kNetworkTechnologyGsm ||
technology == flimflam::kNetworkTechnologyUmts ||
technology == flimflam::kNetworkTechnologyHspa) {
return CONNECTION_3G;
} else if (technology == flimflam::kNetworkTechnologyHspaPlus ||
technology == flimflam::kNetworkTechnologyLte ||
technology == flimflam::kNetworkTechnologyLteAdvanced) {
return CONNECTION_4G;
} else {
return CONNECTION_2G; // Default cellular type is 2G.
}
}
// static
net::NetworkChangeNotifier::NetworkChangeCalculatorParams
NetworkChangeNotifierChromeos::NetworkChangeCalculatorParamsChromeos() {
NetworkChangeCalculatorParams params;
// Delay values arrived at by simple experimentation and adjusted so as to
// produce a single signal when switching between network connections.
params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(4000);
params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(1000);
params.connection_type_offline_delay_ =
base::TimeDelta::FromMilliseconds(500);
params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
return params;
}
} // namespace chromeos
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