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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/shell/browser/shell_network_controller_chromeos.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "base/time/time.h"
#include "base/values.h"
#include "chromeos/ash/components/network/network_configuration_handler.h"
#include "chromeos/ash/components/network/network_connection_handler.h"
#include "chromeos/ash/components/network/network_device_handler.h"
#include "chromeos/ash/components/network/network_handler.h"
#include "chromeos/ash/components/network/network_handler_callbacks.h"
#include "chromeos/ash/components/network/network_state.h"
#include "chromeos/ash/components/network/network_state_handler.h"
#include "chromeos/ash/components/network/network_type_pattern.h"
#include "chromeos/ash/components/network/technology_state_controller.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace extensions {
namespace {
// Frequency at which networks should be scanned when not connected to a network
// or when connected to a non-preferred network.
const int kScanIntervalSec = 10;
void HandleEnableWifiError(const std::string& error_name) {
LOG(WARNING) << "Unable to enable wifi: " << error_name;
}
// Returns a human-readable name for the network described by |network|.
std::string GetNetworkName(const ash::NetworkState& network) {
return !network.name().empty()
? network.name()
: base::StringPrintf("[%s]", network.type().c_str());
}
// Returns true if shill is either connected or connecting to a network.
bool IsConnectedOrConnecting() {
ash::NetworkStateHandler* state_handler =
ash::NetworkHandler::Get()->network_state_handler();
return state_handler->ConnectedNetworkByType(
ash::NetworkTypePattern::Default()) ||
state_handler->ConnectingNetworkByType(
ash::NetworkTypePattern::Default());
}
} // namespace
ShellNetworkController::ShellNetworkController(
const std::string& preferred_network_name)
: state_(STATE_IDLE),
preferred_network_name_(preferred_network_name),
preferred_network_is_active_(false) {
ash::NetworkStateHandler* state_handler =
ash::NetworkHandler::Get()->network_state_handler();
state_handler->AddObserver(this, FROM_HERE);
ash::NetworkHandler::Get()
->technology_state_controller()
->SetTechnologiesEnabled(
ash::NetworkTypePattern::Primitive(shill::kTypeWifi), true,
base::BindRepeating(&HandleEnableWifiError));
// If we're unconnected, trigger a connection attempt and start scanning.
NetworkConnectionStateChanged(nullptr);
}
ShellNetworkController::~ShellNetworkController() {
ash::NetworkHandler::Get()->network_state_handler()->RemoveObserver(
this, FROM_HERE);
}
void ShellNetworkController::NetworkListChanged() {
VLOG(1) << "Network list changed";
ConnectIfUnconnected();
}
void ShellNetworkController::NetworkConnectionStateChanged(
const ash::NetworkState* network) {
if (network) {
VLOG(1) << "Network connection state changed:"
<< " name=" << GetNetworkName(*network)
<< " type=" << network->type() << " path=" << network->path()
<< " state=" << network->connection_state();
} else {
VLOG(1) << "Network connection state changed: [none]";
}
const ash::NetworkState* wifi_network = GetActiveWiFiNetwork();
preferred_network_is_active_ =
wifi_network && wifi_network->name() == preferred_network_name_;
VLOG(2) << "Active WiFi network is "
<< (wifi_network ? wifi_network->name() : std::string("[none]"));
if (preferred_network_is_active_ ||
(preferred_network_name_.empty() && wifi_network)) {
SetScanningEnabled(false);
} else {
SetScanningEnabled(true);
ConnectIfUnconnected();
}
}
void ShellNetworkController::SetCellularAllowRoaming(bool allow_roaming) {
ash::NetworkHandler* handler = ash::NetworkHandler::Get();
ash::NetworkStateHandler::NetworkStateList network_list;
base::Value::Dict properties;
properties.Set(shill::kCellularAllowRoamingProperty, allow_roaming);
handler->network_state_handler()->GetVisibleNetworkListByType(
ash::NetworkTypePattern::Cellular(), &network_list);
for (const ash::NetworkState* network : network_list) {
handler->network_configuration_handler()->SetShillProperties(
network->path(), properties, base::DoNothing(),
ash::network_handler::ErrorCallback());
}
}
const ash::NetworkState* ShellNetworkController::GetActiveWiFiNetwork() {
ash::NetworkStateHandler* state_handler =
ash::NetworkHandler::Get()->network_state_handler();
const ash::NetworkState* network = state_handler->FirstNetworkByType(
ash::NetworkTypePattern::Primitive(shill::kTypeWifi));
return network &&
(network->IsConnectedState() || network->IsConnectingState())
? network
: nullptr;
}
void ShellNetworkController::SetScanningEnabled(bool enabled) {
const bool currently_enabled = scan_timer_.IsRunning();
if (enabled == currently_enabled)
return;
VLOG(1) << (enabled ? "Starting" : "Stopping") << " scanning";
if (enabled) {
RequestScan();
scan_timer_.Start(FROM_HERE, base::Seconds(kScanIntervalSec), this,
&ShellNetworkController::RequestScan);
} else {
scan_timer_.Stop();
}
}
void ShellNetworkController::RequestScan() {
VLOG(1) << "Requesting scan";
ash::NetworkHandler::Get()->network_state_handler()->RequestScan(
ash::NetworkTypePattern::Default());
}
void ShellNetworkController::ConnectIfUnconnected() {
// Don't do anything if the default network is already the preferred one or if
// we have a pending request to connect to it.
if (preferred_network_is_active_ ||
state_ == STATE_WAITING_FOR_PREFERRED_RESULT)
return;
const ash::NetworkState* best_network = nullptr;
bool can_connect_to_preferred_network = false;
ash::NetworkHandler* handler = ash::NetworkHandler::Get();
ash::NetworkStateHandler::NetworkStateList network_list;
handler->network_state_handler()->GetVisibleNetworkListByType(
ash::NetworkTypePattern::WiFi(), &network_list);
for (ash::NetworkStateHandler::NetworkStateList::const_iterator it =
network_list.begin();
it != network_list.end(); ++it) {
const ash::NetworkState* network = *it;
if (!network->connectable())
continue;
if (!preferred_network_name_.empty() &&
network->name() == preferred_network_name_) {
best_network = network;
can_connect_to_preferred_network = true;
break;
} else if (!best_network) {
best_network = network;
}
}
// Don't switch networks if we're already connecting/connected and wouldn't be
// switching to the preferred network.
if ((IsConnectedOrConnecting() || state_ != STATE_IDLE) &&
!can_connect_to_preferred_network)
return;
if (!best_network) {
VLOG(1) << "Didn't find any connectable networks";
return;
}
VLOG(1) << "Connecting to network " << GetNetworkName(*best_network)
<< " with path " << best_network->path() << " and strength "
<< best_network->signal_strength();
state_ = can_connect_to_preferred_network
? STATE_WAITING_FOR_PREFERRED_RESULT
: STATE_WAITING_FOR_NON_PREFERRED_RESULT;
handler->network_connection_handler()->ConnectToNetwork(
best_network->path(),
base::BindOnce(&ShellNetworkController::HandleConnectionSuccess,
weak_ptr_factory_.GetWeakPtr()),
base::BindRepeating(&ShellNetworkController::HandleConnectionError,
weak_ptr_factory_.GetWeakPtr()),
false /* check_error_state */, ash::ConnectCallbackMode::ON_COMPLETED);
}
void ShellNetworkController::HandleConnectionSuccess() {
VLOG(1) << "Successfully connected to network";
state_ = STATE_IDLE;
}
void ShellNetworkController::HandleConnectionError(
const std::string& error_name) {
LOG(WARNING) << "Unable to connect to network: " << error_name;
state_ = STATE_IDLE;
}
} // namespace extensions
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