| // Copyright 2014 The Chromium OS 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 "apmanager/service.h" |
| |
| #include <signal.h> |
| |
| #include <base/bind.h> |
| #include <base/strings/stringprintf.h> |
| #include <brillo/errors/error.h> |
| #include <chromeos/dbus/service_constants.h> |
| |
| #include "apmanager/control_interface.h" |
| #include "apmanager/manager.h" |
| |
| using std::string; |
| |
| namespace apmanager { |
| |
| // static. |
| const char Service::kHostapdPath[] = "/usr/sbin/hostapd"; |
| const char Service::kHostapdConfigPathFormat[] = |
| "/run/apmanager/hostapd/hostapd-%d.conf"; |
| const char Service::kHostapdControlInterfacePath[] = |
| "/run/apmanager/hostapd/ctrl_iface"; |
| |
| 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) |
| : manager_(manager), |
| identifier_(service_identifier), |
| config_(new Config(manager, service_identifier)), |
| adaptor_(manager->control_interface()->CreateServiceAdaptor(this)), |
| dhcp_server_factory_(DHCPServerFactory::GetInstance()), |
| file_writer_(FileWriter::GetInstance()), |
| process_factory_(ProcessFactory::GetInstance()) { |
| adaptor_->SetConfig(config_.get()); |
| adaptor_->SetState(kStateIdle); |
| // TODO(zqiu): come up with better server address management. This is good |
| // enough for now. |
| config_->SetServerAddressIndex(identifier_ & 0xFF); |
| } |
| |
| Service::~Service() { |
| // Stop hostapd process if still running. |
| if (IsHostapdRunning()) { |
| ReleaseResources(); |
| } |
| } |
| |
| bool Service::StartInternal(Error* error) { |
| if (IsHostapdRunning()) { |
| Error::PopulateAndLog( |
| error, Error::kInternalError, "Service already running", FROM_HERE); |
| return false; |
| } |
| |
| // Setup hostapd control interface path. |
| config_->set_control_interface(kHostapdControlInterfacePath); |
| |
| // Generate hostapd configuration content. |
| string config_str; |
| if (!config_->GenerateConfigFile(error, &config_str)) { |
| return false; |
| } |
| |
| // Write configuration to a file. |
| string config_file_name = base::StringPrintf(kHostapdConfigPathFormat, |
| identifier_); |
| if (!file_writer_->Write(config_file_name, config_str)) { |
| Error::PopulateAndLog(error, |
| Error::kInternalError, |
| "Failed to write configuration to a file", |
| FROM_HERE); |
| return false; |
| } |
| |
| // Claim the device needed for this ap service. |
| if (!config_->ClaimDevice()) { |
| Error::PopulateAndLog(error, |
| Error::kInternalError, |
| "Failed to claim the device for this service", |
| FROM_HERE); |
| return false; |
| } |
| |
| // Start hostapd process. |
| if (!StartHostapdProcess(config_file_name)) { |
| Error::PopulateAndLog( |
| error, Error::kInternalError, "Failed to start hostapd", FROM_HERE); |
| // 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()) { |
| Error::PopulateAndLog(error, |
| Error::kInternalError, |
| "Failed to start DHCP server", |
| FROM_HERE); |
| 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. |
| adaptor_->SetState(kStateStarting); |
| |
| return true; |
| } |
| |
| void Service::Start(const base::Callback<void(const Error&)>& result_callback) { |
| Error error; |
| StartInternal(&error); |
| result_callback.Run(error); |
| } |
| |
| bool Service::Stop(Error* error) { |
| if (!IsHostapdRunning()) { |
| Error::PopulateAndLog(error, |
| Error::kInternalError, |
| "Service is not currently running", FROM_HERE); |
| return false; |
| } |
| |
| ReleaseResources(); |
| adaptor_->SetState(kStateIdle); |
| return true; |
| } |
| |
| 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()); |
| // 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: |
| adaptor_->SetState(kStateFailed); |
| break; |
| case HostapdMonitor::kHostapdStarted: |
| adaptor_->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 |