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// Copyright (c) 2012 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 "win8/delegate_execute/chrome_util.h"
#include <windows.h>
#include <atlbase.h>
#include <shlobj.h>
#include <algorithm>
#include <limits>
#include <string>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/md5.h"
#include "base/process/kill.h"
#include "base/process/launch.h"
#include "base/process/process.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/win/scoped_comptr.h"
#include "base/win/scoped_handle.h"
#include "base/win/win_util.h"
#include "chrome/installer/util/browser_distribution.h"
#include "chrome/installer/util/install_util.h"
#include "chrome/installer/util/util_constants.h"
#if defined(GOOGLE_CHROME_BUILD)
#include "google_update/google_update_idl.h" // nogncheck
#endif
namespace {
#if defined(GOOGLE_CHROME_BUILD)
// TODO(grt): These constants live in installer_util. Consider moving them
// into common_constants to allow for reuse.
const base::FilePath::CharType kNewChromeExe[] =
FILE_PATH_LITERAL("new_chrome.exe");
const wchar_t kRenameCommandValue[] = L"cmd";
const wchar_t kRegPathChromeClientBase[] =
L"Software\\Google\\Update\\Clients\\";
// Returns the name of the global event used to detect if |chrome_exe| is in
// use by a browser process.
// TODO(grt): Move this somewhere central so it can be used by both this
// IsBrowserRunning (below) and IsBrowserAlreadyRunning (browser_util_win.cc).
base::string16 GetEventName(const base::FilePath& chrome_exe) {
static wchar_t const kEventPrefix[] = L"Global\\";
const size_t prefix_len = arraysize(kEventPrefix) - 1;
base::string16 name;
name.reserve(prefix_len + chrome_exe.value().size());
name.assign(kEventPrefix, prefix_len);
name.append(chrome_exe.value());
std::replace(name.begin() + prefix_len, name.end(), '\\', '!');
std::transform(name.begin() + prefix_len, name.end(),
name.begin() + prefix_len, tolower);
return name;
}
// Returns true if |chrome_exe| is in use by a browser process. In this case,
// "in use" means past ChromeBrowserMainParts::PreMainMessageLoopRunImpl.
bool IsBrowserRunning(const base::FilePath& chrome_exe) {
base::win::ScopedHandle handle(::OpenEvent(
SYNCHRONIZE, FALSE, GetEventName(chrome_exe).c_str()));
if (handle.IsValid())
return true;
DWORD last_error = ::GetLastError();
if (last_error != ERROR_FILE_NOT_FOUND) {
AtlTrace("%hs. Failed to open browser event; error %u.\n", __FUNCTION__,
last_error);
}
return false;
}
// Returns true if the file new_chrome.exe exists in the same directory as
// |chrome_exe|.
bool NewChromeExeExists(const base::FilePath& chrome_exe) {
base::FilePath new_chrome_exe(chrome_exe.DirName().Append(kNewChromeExe));
return base::PathExists(new_chrome_exe);
}
bool GetUpdateCommand(bool is_per_user, base::string16* update_command) {
const HKEY root = is_per_user ? HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE;
BrowserDistribution* dist = BrowserDistribution::GetDistribution();
base::string16 reg_path_chrome_client = kRegPathChromeClientBase;
reg_path_chrome_client.append(dist->GetAppGuid());
base::win::RegKey key(root, reg_path_chrome_client.c_str(), KEY_QUERY_VALUE);
return key.ReadValue(kRenameCommandValue, update_command) == ERROR_SUCCESS;
}
#endif // GOOGLE_CHROME_BUILD
} // namespace
namespace delegate_execute {
void UpdateChromeIfNeeded(const base::FilePath& chrome_exe) {
#if defined(GOOGLE_CHROME_BUILD)
// Nothing to do if a browser is already running or if there's no
// new_chrome.exe.
if (IsBrowserRunning(chrome_exe) || !NewChromeExeExists(chrome_exe))
return;
base::Process process;
if (InstallUtil::IsPerUserInstall(chrome_exe)) {
// Read the update command from the registry.
base::string16 update_command;
if (!GetUpdateCommand(true, &update_command)) {
AtlTrace("%hs. Failed to read update command from registry.\n",
__FUNCTION__);
} else {
// Run the update command.
base::LaunchOptions launch_options;
launch_options.start_hidden = true;
process = base::LaunchProcess(update_command, launch_options);
if (!process.IsValid()) {
AtlTrace("%hs. Failed to launch command to finalize update; "
"error %u.\n", __FUNCTION__, ::GetLastError());
}
}
} else {
// Run the update command via Google Update.
HRESULT hr = S_OK;
base::win::ScopedComPtr<IProcessLauncher> process_launcher;
hr = process_launcher.CreateInstance(__uuidof(ProcessLauncherClass));
if (FAILED(hr)) {
AtlTrace("%hs. Failed to Create ProcessLauncher; hr=0x%X.\n",
__FUNCTION__, hr);
} else {
ULONG_PTR handle = 0;
BrowserDistribution* dist = BrowserDistribution::GetDistribution();
hr = process_launcher->LaunchCmdElevated(
dist->GetAppGuid().c_str(), kRenameCommandValue,
GetCurrentProcessId(), &handle);
if (FAILED(hr)) {
AtlTrace("%hs. Failed to launch command to finalize update; "
"hr=0x%X.\n", __FUNCTION__, hr);
} else {
process = base::Process(reinterpret_cast<base::ProcessHandle>(handle));
}
}
}
// Wait for the update to complete and report the results.
if (process.IsValid()) {
int exit_code = 0;
if (!process.WaitForExitWithTimeout(
base::TimeDelta::FromMilliseconds(INFINITE), &exit_code)) {
AtlTrace("%hs. Failed to get result when finalizing update.\n",
__FUNCTION__);
} else if (exit_code != installer::RENAME_SUCCESSFUL) {
AtlTrace("%hs. Failed to finalize update with exit code %d.\n",
__FUNCTION__, exit_code);
} else {
AtlTrace("%hs. Finalized pending update.\n", __FUNCTION__);
}
}
#endif
}
} // delegate_execute
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