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// Copyright (c) 2010 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 "base/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/process_util.h"
#include "base/singleton.h"
#include "base/string16.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "base/version.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/service_process_util.h"
namespace {
// This should be more than enough to hold a version string assuming each part
// of the version string is an int64.
const uint32 kMaxVersionStringLength = 256;
// The structure that gets written to shared memory.
struct ServiceProcessSharedData {
char service_process_version[kMaxVersionStringLength];
base::ProcessId service_process_pid;
};
// Gets the name of the shared memory used by the service process to write its
// version. The name is not versioned.
std::string GetServiceProcessSharedMemName() {
return GetServiceProcessScopedName("_service_shmem");
}
// Reads the named shared memory to get the shared data. Returns false if no
// matching shared memory was found.
bool GetServiceProcessSharedData(std::string* version, base::ProcessId* pid) {
scoped_ptr<base::SharedMemory> shared_mem_service_data;
shared_mem_service_data.reset(new base::SharedMemory());
ServiceProcessSharedData* service_data = NULL;
if (shared_mem_service_data.get() &&
shared_mem_service_data->Open(GetServiceProcessSharedMemName(), true) &&
shared_mem_service_data->Map(sizeof(ServiceProcessSharedData))) {
service_data = reinterpret_cast<ServiceProcessSharedData*>(
shared_mem_service_data->memory());
// Make sure the version in shared memory is null-terminated. If it is not,
// treat it as invalid.
if (version && memchr(service_data->service_process_version, '\0',
sizeof(service_data->service_process_version)))
*version = service_data->service_process_version;
if (pid)
*pid = service_data->service_process_pid;
return true;
}
return false;
}
enum ServiceProcessRunningState {
SERVICE_NOT_RUNNING,
SERVICE_OLDER_VERSION_RUNNING,
SERVICE_SAME_VERSION_RUNNING,
SERVICE_NEWER_VERSION_RUNNING,
};
ServiceProcessRunningState GetServiceProcessRunningState(
std::string* service_version_out) {
std::string version;
GetServiceProcessSharedData(&version, NULL);
if (version.empty())
return SERVICE_NOT_RUNNING;
// At this time we have a version string. Set the out param if it exists.
if (service_version_out)
*service_version_out = version;
scoped_ptr<Version> service_version(Version::GetVersionFromString(version));
// If the version string is invalid, treat it like an older version.
if (!service_version.get())
return SERVICE_OLDER_VERSION_RUNNING;
// Get the version of the currently *running* instance of Chrome.
chrome::VersionInfo version_info;
if (!version_info.is_valid()) {
NOTREACHED() << "Failed to get current file version";
// Our own version is invalid. This is an error case. Pretend that we
// are out of date.
return SERVICE_NEWER_VERSION_RUNNING;
}
scoped_ptr<Version> running_version(Version::GetVersionFromString(
version_info.Version()));
if (!running_version.get()) {
NOTREACHED() << "Failed to parse version info";
// Our own version is invalid. This is an error case. Pretend that we
// are out of date.
return SERVICE_NEWER_VERSION_RUNNING;
}
if (running_version->CompareTo(*service_version) > 0) {
return SERVICE_OLDER_VERSION_RUNNING;
} else if (service_version->CompareTo(*running_version) > 0) {
return SERVICE_NEWER_VERSION_RUNNING;
}
return SERVICE_SAME_VERSION_RUNNING;
}
} // namespace
// Return a name that is scoped to this instance of the service process. We
// use the user-data-dir as a scoping prefix.
std::string GetServiceProcessScopedName(const std::string& append_str) {
FilePath user_data_dir;
PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
#if defined(OS_WIN)
std::string scoped_name = WideToUTF8(user_data_dir.value());
#elif defined(OS_POSIX)
std::string scoped_name = user_data_dir.value();
#endif // defined(OS_WIN)
std::replace(scoped_name.begin(), scoped_name.end(), '\\', '!');
std::replace(scoped_name.begin(), scoped_name.end(), '/', '!');
scoped_name.append(append_str);
return scoped_name;
}
// Return a name that is scoped to this instance of the service process. We
// use the user-data-dir and the version as a scoping prefix.
std::string GetServiceProcessScopedVersionedName(
const std::string& append_str) {
std::string versioned_str;
chrome::VersionInfo version_info;
DCHECK(version_info.is_valid());
versioned_str.append(version_info.Version());
versioned_str.append(append_str);
return GetServiceProcessScopedName(versioned_str);
}
// Gets the name of the service process IPC channel.
std::string GetServiceProcessChannelName() {
return GetServiceProcessScopedVersionedName("_service_ipc");
}
base::ProcessId GetServiceProcessPid() {
base::ProcessId pid = 0;
GetServiceProcessSharedData(NULL, &pid);
return pid;
}
ServiceProcessState::ServiceProcessState() : state_(NULL) {
}
ServiceProcessState::~ServiceProcessState() {
TearDownState();
}
// static
ServiceProcessState* ServiceProcessState::GetInstance() {
return Singleton<ServiceProcessState>::get();
}
bool ServiceProcessState::Initialize() {
if (!TakeSingletonLock()) {
return false;
}
// Now that we have the singleton, take care of killing an older version, if
// it exists.
if (ShouldHandleOtherVersion() && !HandleOtherVersion())
return false;
// TODO(sanjeevr): We can probably use the shared mem as the sole singleton
// mechanism. For that the shared mem class needs to return whether it created
// new instance or opened an existing one. Also shared memory on Linux uses
// a file on disk which is not deleted when the process exits.
// Now that we have the singleton, let is also write the version we are using
// to shared memory. This can be used by a newer service to signal us to exit.
return CreateSharedData();
}
bool ServiceProcessState::HandleOtherVersion() {
std::string running_version;
ServiceProcessRunningState state =
GetServiceProcessRunningState(&running_version);
switch (state) {
case SERVICE_SAME_VERSION_RUNNING:
case SERVICE_NEWER_VERSION_RUNNING:
return false;
case SERVICE_OLDER_VERSION_RUNNING:
// If an older version is running, kill it.
ForceServiceProcessShutdown(running_version);
break;
case SERVICE_NOT_RUNNING:
break;
}
return true;
}
bool ServiceProcessState::CreateSharedData() {
chrome::VersionInfo version_info;
if (!version_info.is_valid()) {
NOTREACHED() << "Failed to get current file version";
return false;
}
if (version_info.Version().length() >= kMaxVersionStringLength) {
NOTREACHED() << "Version string length is << " <<
version_info.Version().length() << "which is longer than" <<
kMaxVersionStringLength;
return false;
}
scoped_ptr<base::SharedMemory> shared_mem_service_data;
shared_mem_service_data.reset(new base::SharedMemory());
if (!shared_mem_service_data.get())
return false;
uint32 alloc_size = sizeof(ServiceProcessSharedData);
if (!shared_mem_service_data->CreateNamed(GetServiceProcessSharedMemName(),
true, alloc_size))
return false;
if (!shared_mem_service_data->Map(alloc_size))
return false;
memset(shared_mem_service_data->memory(), 0, alloc_size);
ServiceProcessSharedData* shared_data =
reinterpret_cast<ServiceProcessSharedData*>(
shared_mem_service_data->memory());
memcpy(shared_data->service_process_version, version_info.Version().c_str(),
version_info.Version().length());
shared_data->service_process_pid = base::GetCurrentProcId();
shared_mem_service_data_.reset(shared_mem_service_data.release());
return true;
}
std::string ServiceProcessState::GetAutoRunKey() {
return GetServiceProcessScopedName("_service_run");
}
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