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// 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/strings/stringprintf.h>
#include <chromeos/dbus/service_constants.h>
#include <chromeos/errors/error.h>
#include "apmanager/manager.h"
using chromeos::dbus_utils::AsyncEventSequencer;
using chromeos::dbus_utils::ExportedObjectManager;
using org::chromium::apmanager::ManagerAdaptor;
using std::string;
namespace apmanager {
// static.
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";
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_path_)),
dhcp_server_factory_(DHCPServerFactory::GetInstance()),
file_writer_(FileWriter::GetInstance()),
process_factory_(ProcessFactory::GetInstance()) {
SetConfig(config_->dbus_path());
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();
}
}
void Service::RegisterAsync(ExportedObjectManager* object_manager,
const scoped_refptr<dbus::Bus>& bus,
AsyncEventSequencer* sequencer) {
CHECK(!dbus_object_) << "Already registered";
dbus_object_.reset(
new chromeos::dbus_utils::DBusObject(
object_manager,
bus,
dbus_path_));
RegisterWithDBusObject(dbus_object_.get());
dbus_object_->RegisterAsync(
sequencer->GetHandler("Service.RegisterAsync() failed.", true));
// Register Config DBus object.
config_->RegisterAsync(object_manager, bus, sequencer);
}
bool Service::Start(chromeos::ErrorPtr* error) {
if (IsHostapdRunning()) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::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;
if (!config_->GenerateConfigFile(error, &config_str)) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::errors::dbus::kDomain, kServiceError,
"Failed to generate config file");
return false;
}
// Write configuration to a file.
string config_file_name = base::StringPrintf(kHostapdConfigPathFormat,
identifier_);
if (!file_writer_->Write(config_file_name, config_str)) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::errors::dbus::kDomain, kServiceError,
"Failed to write configuration to a file");
return false;
}
// Claim the device needed for this ap service.
if (!config_->ClaimDevice()) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::errors::dbus::kDomain, kServiceError,
"Failed to claim the device for this service");
return false;
}
// Start hostapd process.
if (!StartHostapdProcess(config_file_name)) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::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()) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::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,
base::Unretained(this)),
config_->control_interface(),
config_->selected_interface()));
}
hostapd_monitor_->Start();
// Update service state.
SetState(kStateStarting);
return true;
}
bool Service::Stop(chromeos::ErrorPtr* error) {
if (!IsHostapdRunning()) {
chromeos::Error::AddTo(
error, FROM_HERE, chromeos::errors::dbus::kDomain, kServiceError,
"Service is not currently running");
return false;
}
ReleaseResources();
SetState(kStateIdle);
return true;
}
bool Service::IsHostapdRunning() {
return hostapd_process_ && hostapd_process_->pid() != 0 &&
chromeos::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();
config_->ReleaseDevice();
manager_->ReleaseDHCPPortAccess(config_->selected_interface());
}
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
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