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// Copyright (c) 2011 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 "chrome/common/service_process_util.h"
#include "base/callback.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/path_service.h"
#include "base/strings/string16.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/object_watcher.h"
#include "base/win/scoped_handle.h"
#include "base/win/win_util.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
namespace {
const char* kTerminateEventSuffix = "_service_terminate_evt";
base::string16 GetServiceProcessReadyEventName() {
return base::UTF8ToWide(
GetServiceProcessScopedVersionedName("_service_ready"));
}
base::string16 GetServiceProcessTerminateEventName() {
return base::UTF8ToWide(
GetServiceProcessScopedVersionedName(kTerminateEventSuffix));
}
std::string GetServiceProcessAutoRunKey() {
return GetServiceProcessScopedName("_service_run");
}
// Returns the name of the autotun reg value that we used to use for older
// versions of Chrome.
std::string GetObsoleteServiceProcessAutoRunKey() {
base::FilePath user_data_dir;
PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
std::string scoped_name = base::WideToUTF8(user_data_dir.value());
std::replace(scoped_name.begin(), scoped_name.end(), '\\', '!');
std::replace(scoped_name.begin(), scoped_name.end(), '/', '!');
scoped_name.append("_service_run");
return scoped_name;
}
class ServiceProcessTerminateMonitor
: public base::win::ObjectWatcher::Delegate {
public:
explicit ServiceProcessTerminateMonitor(const base::Closure& terminate_task)
: terminate_task_(terminate_task) {
}
void Start() {
base::string16 event_name = GetServiceProcessTerminateEventName();
DCHECK(event_name.length() <= MAX_PATH);
terminate_event_.Set(CreateEvent(NULL, TRUE, FALSE, event_name.c_str()));
watcher_.StartWatching(terminate_event_.Get(), this);
}
// base::ObjectWatcher::Delegate implementation.
virtual void OnObjectSignaled(HANDLE object) {
if (!terminate_task_.is_null()) {
terminate_task_.Run();
terminate_task_.Reset();
}
}
private:
base::win::ScopedHandle terminate_event_;
base::win::ObjectWatcher watcher_;
base::Closure terminate_task_;
};
} // namespace
// Gets the name of the service process IPC channel.
IPC::ChannelHandle GetServiceProcessChannel() {
return GetServiceProcessScopedVersionedName("_service_ipc");
}
bool ForceServiceProcessShutdown(const std::string& version,
base::ProcessId process_id) {
base::win::ScopedHandle terminate_event;
std::string versioned_name = version;
versioned_name.append(kTerminateEventSuffix);
base::string16 event_name =
base::UTF8ToWide(GetServiceProcessScopedName(versioned_name));
terminate_event.Set(OpenEvent(EVENT_MODIFY_STATE, FALSE, event_name.c_str()));
if (!terminate_event.IsValid())
return false;
SetEvent(terminate_event.Get());
return true;
}
bool CheckServiceProcessReady() {
base::string16 event_name = GetServiceProcessReadyEventName();
base::win::ScopedHandle event(
OpenEvent(SYNCHRONIZE | READ_CONTROL, false, event_name.c_str()));
if (!event.IsValid())
return false;
// Check if the event is signaled.
return WaitForSingleObject(event, 0) == WAIT_OBJECT_0;
}
struct ServiceProcessState::StateData {
// An event that is signaled when a service process is ready.
base::win::ScopedHandle ready_event;
scoped_ptr<ServiceProcessTerminateMonitor> terminate_monitor;
};
void ServiceProcessState::CreateState() {
DCHECK(!state_);
state_ = new StateData;
}
bool ServiceProcessState::TakeSingletonLock() {
DCHECK(state_);
base::string16 event_name = GetServiceProcessReadyEventName();
DCHECK(event_name.length() <= MAX_PATH);
base::win::ScopedHandle service_process_ready_event;
service_process_ready_event.Set(
CreateEvent(NULL, TRUE, FALSE, event_name.c_str()));
DWORD error = GetLastError();
if ((error == ERROR_ALREADY_EXISTS) || (error == ERROR_ACCESS_DENIED))
return false;
DCHECK(service_process_ready_event.IsValid());
state_->ready_event.Set(service_process_ready_event.Take());
return true;
}
bool ServiceProcessState::SignalReady(
base::MessageLoopProxy* message_loop_proxy,
const base::Closure& terminate_task) {
DCHECK(state_);
DCHECK(state_->ready_event.IsValid());
if (!SetEvent(state_->ready_event.Get())) {
return false;
}
if (!terminate_task.is_null()) {
state_->terminate_monitor.reset(
new ServiceProcessTerminateMonitor(terminate_task));
state_->terminate_monitor->Start();
}
return true;
}
bool ServiceProcessState::AddToAutoRun() {
DCHECK(autorun_command_line_.get());
// Remove the old autorun value first because we changed the naming scheme
// for the autorun value name.
base::win::RemoveCommandFromAutoRun(
HKEY_CURRENT_USER,
base::UTF8ToWide(GetObsoleteServiceProcessAutoRunKey()));
return base::win::AddCommandToAutoRun(
HKEY_CURRENT_USER,
base::UTF8ToWide(GetServiceProcessAutoRunKey()),
autorun_command_line_->GetCommandLineString());
}
bool ServiceProcessState::RemoveFromAutoRun() {
// Remove the old autorun value first because we changed the naming scheme
// for the autorun value name.
base::win::RemoveCommandFromAutoRun(
HKEY_CURRENT_USER,
base::UTF8ToWide(GetObsoleteServiceProcessAutoRunKey()));
return base::win::RemoveCommandFromAutoRun(
HKEY_CURRENT_USER, base::UTF8ToWide(GetServiceProcessAutoRunKey()));
}
void ServiceProcessState::TearDownState() {
delete state_;
state_ = NULL;
}
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