| // |
| // Copyright (C) 2014 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| #include "apmanager/service.h" |
| |
| #include <signal.h> |
| |
| #include <base/strings/stringprintf.h> |
| #include <brillo/errors/error.h> |
| |
| #if !defined(__ANDROID__) |
| #include <chromeos/dbus/service_constants.h> |
| #else |
| #include "dbus/apmanager/dbus-constants.h" |
| #endif // __ANDROID__ |
| |
| #if defined(__BRILLO__) |
| #include <base/bind.h> |
| |
| #include "apmanager/event_dispatcher.h" |
| #endif // __BRILLO__ |
| |
| #include "apmanager/error.h" |
| #include "apmanager/manager.h" |
| |
| using brillo::dbus_utils::AsyncEventSequencer; |
| using brillo::dbus_utils::DBusMethodResponse; |
| using brillo::dbus_utils::ExportedObjectManager; |
| using org::chromium::apmanager::ManagerAdaptor; |
| using std::string; |
| |
| namespace apmanager { |
| |
| // static. |
| #if !defined(__ANDROID__) |
| const char Service::kHostapdPath[] = "/usr/sbin/hostapd"; |
| const char Service::kHostapdConfigPathFormat[] = |
| "/var/run/apmanager/hostapd/hostapd-%d.conf"; |
| const char Service::kHostapdControlInterfacePath[] = |
| "/var/run/apmanager/hostapd/ctrl_iface"; |
| #else |
| const char Service::kHostapdPath[] = "/system/bin/hostapd"; |
| const char Service::kHostapdConfigPathFormat[] = |
| "/data/misc/apmanager/hostapd/hostapd-%d.conf"; |
| const char Service::kHostapdControlInterfacePath[] = |
| "/data/misc/apmanager/hostapd/ctrl_iface"; |
| #endif // __ANDROID__ |
| |
| #if defined(__BRILLO__) |
| const int Service::kAPInterfaceCheckIntervalMilliseconds = 200; |
| const int Service::kAPInterfaceCheckMaxAttempts = 5; |
| #endif // __BRILLO__ |
| |
| const int Service::kTerminationTimeoutSeconds = 2; |
| |
| // static. Service state definitions. |
| const char Service::kStateIdle[] = "Idle"; |
| const char Service::kStateStarting[] = "Starting"; |
| const char Service::kStateStarted[] = "Started"; |
| const char Service::kStateFailed[] = "Failed"; |
| |
| Service::Service(Manager* manager, int service_identifier) |
| : org::chromium::apmanager::ServiceAdaptor(this), |
| manager_(manager), |
| identifier_(service_identifier), |
| service_path_( |
| base::StringPrintf("%s/services/%d", |
| ManagerAdaptor::GetObjectPath().value().c_str(), |
| service_identifier)), |
| dbus_path_(dbus::ObjectPath(service_path_)), |
| config_(new Config(manager, service_identifier)), |
| dhcp_server_factory_(DHCPServerFactory::GetInstance()), |
| file_writer_(FileWriter::GetInstance()), |
| process_factory_(ProcessFactory::GetInstance()) { |
| SetConfig(config_->adaptor()->GetRpcObjectIdentifier()); |
| SetState(kStateIdle); |
| // TODO(zqiu): come up with better server address management. This is good |
| // enough for now. |
| config_->SetServerAddressIndex(identifier_ & 0xFF); |
| |
| #if defined(__BRILLO__) |
| event_dispatcher_ = EventDispatcher::GetInstance(); |
| start_in_progress_ = false; |
| #endif |
| } |
| |
| Service::~Service() { |
| // Stop hostapd process if still running. |
| if (IsHostapdRunning()) { |
| ReleaseResources(); |
| } |
| } |
| |
| void Service::RegisterAsync(ExportedObjectManager* object_manager, |
| const scoped_refptr<dbus::Bus>& bus, |
| AsyncEventSequencer* sequencer) { |
| CHECK(!dbus_object_) << "Already registered"; |
| dbus_object_.reset( |
| new brillo::dbus_utils::DBusObject( |
| object_manager, |
| bus, |
| dbus_path_)); |
| RegisterWithDBusObject(dbus_object_.get()); |
| dbus_object_->RegisterAsync( |
| sequencer->GetHandler("Service.RegisterAsync() failed.", true)); |
| } |
| |
| bool Service::StartInternal(brillo::ErrorPtr* error) { |
| if (IsHostapdRunning()) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Service already running"); |
| return false; |
| } |
| |
| // Setup hostapd control interface path. |
| config_->set_control_interface(kHostapdControlInterfacePath); |
| |
| // Generate hostapd configuration content. |
| string config_str; |
| Error internal_error; |
| if (!config_->GenerateConfigFile(&internal_error, &config_str)) { |
| // TODO(zqiu): temporary until D-Bus is decoupled from this class. |
| internal_error.ToDBusError(error); |
| return false; |
| } |
| |
| // Write configuration to a file. |
| string config_file_name = base::StringPrintf(kHostapdConfigPathFormat, |
| identifier_); |
| if (!file_writer_->Write(config_file_name, config_str)) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Failed to write configuration to a file"); |
| return false; |
| } |
| |
| // Claim the device needed for this ap service. |
| if (!config_->ClaimDevice()) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Failed to claim the device for this service"); |
| return false; |
| } |
| |
| // Start hostapd process. |
| if (!StartHostapdProcess(config_file_name)) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Failed to start hostapd"); |
| // Release the device claimed for this service. |
| config_->ReleaseDevice(); |
| return false; |
| } |
| |
| // Start DHCP server if in server mode. |
| if (config_->GetOperationMode() == kOperationModeServer) { |
| dhcp_server_.reset( |
| dhcp_server_factory_->CreateDHCPServer(config_->GetServerAddressIndex(), |
| config_->selected_interface())); |
| if (!dhcp_server_->Start()) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Failed to start DHCP server"); |
| ReleaseResources(); |
| return false; |
| } |
| manager_->RequestDHCPPortAccess(config_->selected_interface()); |
| } |
| |
| // Start monitoring hostapd. |
| if (!hostapd_monitor_) { |
| hostapd_monitor_.reset( |
| new HostapdMonitor(base::Bind(&Service::HostapdEventCallback, |
| weak_factory_.GetWeakPtr()), |
| config_->control_interface(), |
| config_->selected_interface())); |
| } |
| hostapd_monitor_->Start(); |
| |
| // Update service state. |
| SetState(kStateStarting); |
| |
| return true; |
| } |
| |
| void Service::Start(std::unique_ptr<DBusMethodResponse<>> response) { |
| brillo::ErrorPtr error; |
| |
| #if !defined(__BRILLO__) |
| if (!StartInternal(&error)) { |
| response->ReplyWithError(error.get()); |
| } else { |
| response->Return(); |
| } |
| #else |
| if (start_in_progress_) { |
| brillo::Error::AddTo( |
| &error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Start already in progress"); |
| response->ReplyWithError(error.get()); |
| return; |
| } |
| |
| string interface_name; |
| if (!manager_->SetupApModeInterface(&interface_name)) { |
| brillo::Error::AddTo( |
| &error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Failed to setup AP mode interface"); |
| response->ReplyWithError(error.get()); |
| return; |
| } |
| |
| event_dispatcher_->PostDelayedTask( |
| base::Bind(&Service::APInterfaceCheckTask, |
| weak_factory_.GetWeakPtr(), |
| interface_name, |
| 0, // Initial check count. |
| base::Passed(&response)), |
| kAPInterfaceCheckIntervalMilliseconds); |
| #endif |
| } |
| |
| bool Service::Stop(brillo::ErrorPtr* error) { |
| if (!IsHostapdRunning()) { |
| brillo::Error::AddTo( |
| error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Service is not currently running"); |
| return false; |
| } |
| |
| ReleaseResources(); |
| SetState(kStateIdle); |
| return true; |
| } |
| |
| #if defined(__BRILLO__) |
| void Service::HandleStartFailure() { |
| // Restore station mode interface. |
| string station_mode_interface; |
| manager_->SetupStationModeInterface(&station_mode_interface); |
| |
| // Reset state variables. |
| start_in_progress_ = false; |
| } |
| |
| void Service::APInterfaceCheckTask( |
| const string& interface_name, |
| int check_count, |
| std::unique_ptr<DBusMethodResponse<>> response) { |
| brillo::ErrorPtr error; |
| |
| // Check if the AP interface is enumerated. |
| if (manager_->GetDeviceFromInterfaceName(interface_name)) { |
| // Explicitly set the interface name to avoid picking other interface. |
| config_->SetInterfaceName(interface_name); |
| if (!StartInternal(&error)) { |
| HandleStartFailure(); |
| response->ReplyWithError(error.get()); |
| } else { |
| response->Return(); |
| } |
| return; |
| } |
| |
| check_count++; |
| if (check_count >= kAPInterfaceCheckMaxAttempts) { |
| brillo::Error::AddTo( |
| &error, FROM_HERE, brillo::errors::dbus::kDomain, kServiceError, |
| "Timeout waiting for AP interface to be enumerated"); |
| HandleStartFailure(); |
| response->ReplyWithError(error.get()); |
| return; |
| } |
| |
| event_dispatcher_->PostDelayedTask( |
| base::Bind(&Service::APInterfaceCheckTask, |
| weak_factory_.GetWeakPtr(), |
| interface_name, |
| check_count, |
| base::Passed(&response)), |
| kAPInterfaceCheckIntervalMilliseconds); |
| } |
| #endif // __BRILLO__ |
| |
| bool Service::IsHostapdRunning() { |
| return hostapd_process_ && hostapd_process_->pid() != 0 && |
| brillo::Process::ProcessExists(hostapd_process_->pid()); |
| } |
| |
| bool Service::StartHostapdProcess(const string& config_file_path) { |
| hostapd_process_.reset(process_factory_->CreateProcess()); |
| hostapd_process_->AddArg(kHostapdPath); |
| hostapd_process_->AddArg(config_file_path); |
| if (!hostapd_process_->Start()) { |
| hostapd_process_.reset(); |
| return false; |
| } |
| return true; |
| } |
| |
| void Service::StopHostapdProcess() { |
| if (!hostapd_process_->Kill(SIGTERM, kTerminationTimeoutSeconds)) { |
| hostapd_process_->Kill(SIGKILL, kTerminationTimeoutSeconds); |
| } |
| hostapd_process_.reset(); |
| } |
| |
| void Service::ReleaseResources() { |
| hostapd_monitor_.reset(); |
| StopHostapdProcess(); |
| dhcp_server_.reset(); |
| manager_->ReleaseDHCPPortAccess(config_->selected_interface()); |
| #if defined(__BRILLO__) |
| // Restore station mode interface. |
| string station_mode_interface; |
| manager_->SetupStationModeInterface(&station_mode_interface); |
| #endif // __BRILLO__ |
| // Only release device after mode switching had completed, to |
| // make sure the station mode interface gets enumerated by |
| // shill. |
| config_->ReleaseDevice(); |
| } |
| |
| void Service::HostapdEventCallback(HostapdMonitor::Event event, |
| const std::string& data) { |
| switch (event) { |
| case HostapdMonitor::kHostapdFailed: |
| SetState(kStateFailed); |
| break; |
| case HostapdMonitor::kHostapdStarted: |
| SetState(kStateStarted); |
| break; |
| case HostapdMonitor::kStationConnected: |
| LOG(INFO) << "Station connected: " << data; |
| break; |
| case HostapdMonitor::kStationDisconnected: |
| LOG(INFO) << "Station disconnected: " << data; |
| break; |
| default: |
| LOG(ERROR) << "Unknown event: " << event; |
| break; |
| } |
| } |
| |
| } // namespace apmanager |