// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/install_static/install_util.h"
#include <windows.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <limits>
#include <memory>
#include <sstream>
#include "base/compiler_specific.h"
#include "base/version_info/channel.h"
#include "build/branding_buildflags.h"
#include "chrome/chrome_elf/nt_registry/nt_registry.h"
#include "chrome/install_static/buildflags.h"
#include "chrome/install_static/install_details.h"
#include "chrome/install_static/install_modes.h"
#include "chrome/install_static/policy_path_parser.h"
#include "chrome/install_static/user_data_dir.h"
#include "components/nacl/common/buildflags.h"
namespace install_static {
enum class ProcessType {
UNINITIALIZED,
OTHER_PROCESS,
BROWSER_PROCESS,
#if BUILDFLAG(ENABLE_NACL)
NACL_LOADER_PROCESS,
#endif
CRASHPAD_HANDLER_PROCESS,
};
// Caches the |ProcessType| of the current process.
ProcessType g_process_type = ProcessType::UNINITIALIZED;
const wchar_t kRegValueChromeStatsSample[] = L"UsageStatsInSample";
// TODO(ananta)
// http://crbug.com/604923
// The constants defined in this file are also defined in chrome/installer and
// other places. we need to unify them.
const wchar_t kHeadless[] = L"CHROME_HEADLESS";
const wchar_t kShowRestart[] = L"CHROME_CRASHED";
const wchar_t kRestartInfo[] = L"CHROME_RESTART";
const wchar_t kRtlLocale[] = L"RIGHT_TO_LEFT";
const wchar_t kCrashpadHandler[] = L"crashpad-handler";
const wchar_t kFallbackHandler[] = L"fallback-handler";
const wchar_t kProcessType[] = L"type";
const wchar_t kUserDataDirSwitch[] = L"user-data-dir";
const wchar_t kUtilityProcess[] = L"utility";
namespace {
#if BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
// TODO(ananta)
// http://crbug.com/604923
// The constants defined in this file are also defined in chrome/installer and
// other places. we need to unify them.
// Chrome channel display names.
constexpr wchar_t kChromeChannelDev[] = L"dev";
constexpr wchar_t kChromeChannelBeta[] = L"beta";
constexpr wchar_t kChromeChannelExtended[] = L"extended";
constexpr wchar_t kChromeChannelStableExplicit[] = L"stable";
#endif
// TODO(ananta)
// http://crbug.com/604923
// These constants are defined in the chrome/installer directory as well. We
// need to unify them.
constexpr wchar_t kRegValueUsageStats[] = L"usagestats";
constexpr wchar_t kMetricsReportingEnabled[] = L"MetricsReportingEnabled";
#if BUILDFLAG(ENABLE_NACL)
constexpr wchar_t kNaClLoaderProcess[] = L"nacl-loader";
#endif
void Trace(const wchar_t* format_string, ...) {
static const int kMaxLogBufferSize = 1024;
static wchar_t buffer[kMaxLogBufferSize] = {};
va_list args = {};
va_start(args, format_string);
vswprintf(buffer, kMaxLogBufferSize, format_string, args);
OutputDebugStringW(buffer);
va_end(args);
}
bool GetLanguageAndCodePageFromVersionResource(const char* version_resource,
WORD* language,
WORD* code_page) {
if (!version_resource)
return false;
struct LanguageAndCodePage {
WORD language;
WORD code_page;
};
LanguageAndCodePage* translation_info = nullptr;
uint32_t data_size_in_bytes = 0;
BOOL query_result = VerQueryValueW(
version_resource, L"\\VarFileInfo\\Translation",
reinterpret_cast<void**>(&translation_info), &data_size_in_bytes);
if (!query_result)
return false;
*language = translation_info->language;
*code_page = translation_info->code_page;
return true;
}
bool GetValueFromVersionResource(const char* version_resource,
const std::wstring& name,
std::wstring* value_str) {
assert(value_str);
value_str->clear();
// TODO(ananta)
// It may be better in the long run to enumerate the languages and code pages
// in the version resource and return the value from the first match.
WORD language = 0;
WORD code_page = 0;
if (!GetLanguageAndCodePageFromVersionResource(version_resource, &language,
&code_page)) {
return false;
}
const size_t array_size = 8;
WORD lang_codepage[array_size] = {};
size_t i = 0;
// Use the language and codepage
lang_codepage[i++] = language;
lang_codepage[i++] = code_page;
// Use the default language and codepage from the resource.
lang_codepage[i++] = ::GetUserDefaultLangID();
lang_codepage[i++] = code_page;
// Use the language from the resource and Latin codepage (most common).
lang_codepage[i++] = language;
lang_codepage[i++] = 1252;
// Use the default language and Latin codepage (most common).
lang_codepage[i++] = ::GetUserDefaultLangID();
lang_codepage[i++] = 1252;
static_assert((array_size % 2) == 0,
"Language code page size should be a multiple of 2");
assert(array_size == i);
for (i = 0; i < array_size;) {
wchar_t sub_block[MAX_PATH];
language = lang_codepage[i++];
code_page = lang_codepage[i++];
_snwprintf_s(sub_block, MAX_PATH, MAX_PATH,
L"\\StringFileInfo\\%04hx%04hx\\%ls", language, code_page,
name.c_str());
void* value = nullptr;
uint32_t size = 0;
BOOL r = ::VerQueryValueW(version_resource, sub_block, &value, &size);
if (r && value) {
value_str->assign(static_cast<wchar_t*>(value));
return true;
}
}
return false;
}
bool DirectoryExists(const std::wstring& path) {
DWORD file_attributes = ::GetFileAttributes(path.c_str());
if (file_attributes == INVALID_FILE_ATTRIBUTES)
return false;
return (file_attributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
}
// Define specializations for white spaces based on the type of the string.
template <class StringType>
StringType GetWhiteSpacesForType();
template <>
std::wstring GetWhiteSpacesForType() {
return L" \t\n\r\f\v";
}
template <>
std::string GetWhiteSpacesForType() {
return " \t\n\r\f\v";
}
// Trim whitespaces from left & right
template <class StringType>
void TrimT(StringType* str) {
str->erase(str->find_last_not_of(GetWhiteSpacesForType<StringType>()) + 1);
str->erase(0, str->find_first_not_of(GetWhiteSpacesForType<StringType>()));
}
// Tokenizes a string based on a single character delimiter.
template <class StringType>
std::vector<StringType> TokenizeStringT(
const StringType& str,
typename StringType::value_type delimiter,
bool trim_spaces) {
std::vector<StringType> tokens;
std::basic_istringstream<typename StringType::value_type> buffer(str);
for (StringType token; std::getline(buffer, token, delimiter);) {
if (trim_spaces)
TrimT<StringType>(&token);
tokens.push_back(token);
}
return tokens;
}
#if BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
// Returns true if `channel_test` is a valid name of a Chrome update channel
// (irrespective of case), or false otherwise. When returning true, `channel` is
// populated with the canonical channel name and `is_extended_stable` is set to
// true if `channel_test` identifies the extended stable update channel. The
// accepted channel names and their canonical names are:
//
// channel inputs canonical name
// ---------------------------------------------------
// extended stable "extended" "extended"
// stable "" or "stable" ""
// beta "beta" "beta"
// dev "dev" "dev"
bool GetChromeChannelNameFromString(const wchar_t* channel_test,
std::wstring& channel,
bool& is_extended_stable) {
assert(channel_test);
if (!*channel_test ||
!lstrcmpiW(channel_test, kChromeChannelStableExplicit)) {
channel.clear();
is_extended_stable = false;
} else if (!lstrcmpiW(channel_test, kChromeChannelExtended)) {
channel.clear();
is_extended_stable = true;
} else if (!lstrcmpiW(channel_test, kChromeChannelBeta)) {
channel = kChromeChannelBeta;
is_extended_stable = false;
} else if (!lstrcmpiW(channel_test, kChromeChannelDev)) {
channel = kChromeChannelDev;
is_extended_stable = false;
} else {
return false;
}
return true;
}
#endif // BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
// Converts a process type specified as a string to the ProcessType enum.
ProcessType GetProcessType(const std::wstring& process_type) {
if (process_type.empty())
return ProcessType::BROWSER_PROCESS;
#if BUILDFLAG(ENABLE_NACL)
if (process_type == kNaClLoaderProcess)
return ProcessType::NACL_LOADER_PROCESS;
#endif
if (process_type == kCrashpadHandler)
return ProcessType::CRASHPAD_HANDLER_PROCESS;
return ProcessType::OTHER_PROCESS;
}
// Returns whether |process_type| needs the profile directory.
bool ProcessNeedsProfileDir(ProcessType process_type) {
// On Windows we don't want subprocesses other than the browser process and
// service processes to be able to use the profile directory because if it
// lies on a network share the sandbox will prevent us from accessing it.
switch (process_type) {
case ProcessType::BROWSER_PROCESS:
#if BUILDFLAG(ENABLE_NACL)
case ProcessType::NACL_LOADER_PROCESS:
#endif
return true;
case ProcessType::OTHER_PROCESS:
return false;
case ProcessType::CRASHPAD_HANDLER_PROCESS:
return false;
case ProcessType::UNINITIALIZED:
assert(false);
return false;
}
assert(false);
return false;
}
} // namespace
bool IsSystemInstall() {
return InstallDetails::Get().system_level();
}
std::wstring GetChromeInstallSubDirectory() {
std::wstring result;
AppendChromeInstallSubDirectory(InstallDetails::Get().mode(),
true /* include_suffix */, &result);
return result;
}
std::wstring GetRegistryPath() {
std::wstring result(L"Software\\");
AppendChromeInstallSubDirectory(InstallDetails::Get().mode(),
true /* include_suffix */, &result);
return result;
}
std::wstring GetClientsKeyPath() {
return GetClientsKeyPath(GetAppGuid());
}
std::wstring GetClientStateKeyPath() {
return GetClientStateKeyPath(GetAppGuid());
}
std::wstring GetClientStateMediumKeyPath() {
return GetClientStateMediumKeyPath(GetAppGuid());
}
std::wstring GetUninstallRegistryPath() {
std::wstring result(
L"Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\");
if (*kCompanyPathName)
result.append(kCompanyPathName).append(1, L' ');
result.append(kProductPathName, kProductPathNameLength);
return result.append(InstallDetails::Get().mode().install_suffix);
}
const wchar_t* GetAppGuid() {
return InstallDetails::Get().app_guid();
}
const CLSID& GetToastActivatorClsid() {
return InstallDetails::Get().toast_activator_clsid();
}
const CLSID& GetElevatorClsid() {
return InstallDetails::Get().elevator_clsid();
}
const IID& GetElevatorIid() {
return InstallDetails::Get().elevator_iid();
}
std::wstring GetElevationServiceName() {
std::wstring name = GetElevationServiceDisplayName();
name.erase(std::remove_if(name.begin(), name.end(), isspace), name.end());
return name;
}
std::wstring GetElevationServiceDisplayName() {
static constexpr wchar_t kElevationServiceDisplayName[] =
L" Elevation Service";
return GetBaseAppName() + kElevationServiceDisplayName;
}
std::wstring GetBaseAppName() {
return InstallDetails::Get().mode().base_app_name;
}
const wchar_t* GetBaseAppId() {
return InstallDetails::Get().base_app_id();
}
const wchar_t* GetBrowserProgIdPrefix() {
return InstallDetails::Get().mode().browser_prog_id_prefix;
}
const wchar_t* GetBrowserProgIdDescription() {
return InstallDetails::Get().mode().browser_prog_id_description;
}
const wchar_t* GetPDFProgIdPrefix() {
return InstallDetails::Get().mode().pdf_prog_id_prefix;
}
const wchar_t* GetPDFProgIdDescription() {
return InstallDetails::Get().mode().pdf_prog_id_description;
}
std::wstring GetActiveSetupPath() {
return std::wstring(
L"Software\\Microsoft\\Active Setup\\Installed Components\\")
.append(InstallDetails::Get().mode().active_setup_guid);
}
std::wstring GetLegacyCommandExecuteImplClsid() {
return InstallDetails::Get().mode().legacy_command_execute_clsid;
}
bool SupportsSetAsDefaultBrowser() {
return InstallDetails::Get().mode().supports_set_as_default_browser;
}
int GetAppIconResourceIndex() {
return InstallDetails::Get().mode().app_icon_resource_index;
}
int GetHTMLIconResourceIndex() {
// TODO(crbug.com/40384442): Return HTML specific resource index
// once we've added support for it. This will be used for all doc types
// Chrome registers itself as a default handler for, except for .pdf.
return InstallDetails::Get().mode().app_icon_resource_index;
}
int GetPDFIconResourceIndex() {
// TODO(crbug.com/40384442): Return PDF specific resource index
// once we've added support for it.
return InstallDetails::Get().mode().app_icon_resource_index;
}
const wchar_t* GetSandboxSidPrefix() {
return InstallDetails::Get().mode().sandbox_sid_prefix;
}
std::string GetSafeBrowsingName() {
return kSafeBrowsingName;
}
bool GetCollectStatsConsent() {
bool enabled = true;
if (ReportingIsEnforcedByPolicy(&enabled))
return enabled;
const bool system_install = IsSystemInstall();
DWORD out_value = 0;
// If system_install, first try ClientStateMedium in HKLM.
if (system_install &&
nt::QueryRegValueDWORD(
nt::HKLM, nt::WOW6432,
InstallDetails::Get().GetClientStateMediumKeyPath().c_str(),
kRegValueUsageStats, &out_value)) {
return (out_value == 1);
}
// Second, try ClientState.
return (nt::QueryRegValueDWORD(
system_install ? nt::HKLM : nt::HKCU, nt::WOW6432,
InstallDetails::Get().GetClientStateKeyPath().c_str(),
kRegValueUsageStats, &out_value) &&
out_value == 1);
}
bool GetCollectStatsInSample() {
std::wstring registry_path = GetRegistryPath();
DWORD out_value = 0;
if (!nt::QueryRegValueDWORD(nt::HKCU, nt::WOW6432, registry_path.c_str(),
kRegValueChromeStatsSample, &out_value)) {
// If reading the value failed, treat it as though sampling isn't in effect,
// implicitly meaning this install is in the sample.
return true;
}
return out_value == 1;
}
bool SetCollectStatsInSample(bool in_sample) {
std::wstring registry_path = GetRegistryPath();
HANDLE key_handle = INVALID_HANDLE_VALUE;
if (!nt::CreateRegKey(nt::HKCU, registry_path.c_str(),
KEY_SET_VALUE | KEY_WOW64_32KEY, &key_handle)) {
return false;
}
bool success = nt::SetRegValueDWORD(key_handle, kRegValueChromeStatsSample,
in_sample ? 1 : 0);
nt::CloseRegKey(key_handle);
return success;
}
// Appends "[kCompanyPathName\]kProductPathName[install_suffix]" to |path|,
// returning a reference to |path|.
std::wstring& AppendChromeInstallSubDirectory(const InstallConstants& mode,
bool include_suffix,
std::wstring* path) {
if (*kCompanyPathName) {
path->append(kCompanyPathName);
path->push_back(L'\\');
}
path->append(kProductPathName, kProductPathNameLength);
if (!include_suffix)
return *path;
return path->append(mode.install_suffix);
}
bool ReportingIsEnforcedByPolicy(bool* crash_reporting_enabled) {
std::wstring policies_path = L"SOFTWARE\\Policies\\";
AppendChromeInstallSubDirectory(InstallDetails::Get().mode(),
false /* !include_suffix */, &policies_path);
DWORD value = 0;
// First, try HKLM.
if (nt::QueryRegValueDWORD(nt::HKLM, nt::NONE, policies_path.c_str(),
kMetricsReportingEnabled, &value)) {
*crash_reporting_enabled = (value != 0);
return true;
}
// Second, try HKCU.
if (nt::QueryRegValueDWORD(nt::HKCU, nt::NONE, policies_path.c_str(),
kMetricsReportingEnabled, &value)) {
*crash_reporting_enabled = (value != 0);
return true;
}
return false;
}
void InitializeProcessType() {
assert(g_process_type == ProcessType::UNINITIALIZED);
std::wstring process_type =
GetSwitchValueFromCommandLine(::GetCommandLine(), kProcessType);
g_process_type = GetProcessType(process_type);
}
bool IsProcessTypeInitialized() {
return g_process_type != ProcessType::UNINITIALIZED;
}
bool IsBrowserProcess() {
assert(g_process_type != ProcessType::UNINITIALIZED);
return g_process_type == ProcessType::BROWSER_PROCESS;
}
bool IsCrashpadHandlerProcess() {
assert(g_process_type != ProcessType::UNINITIALIZED);
return g_process_type == ProcessType::CRASHPAD_HANDLER_PROCESS;
}
bool ProcessNeedsProfileDir(const std::string& process_type) {
return ProcessNeedsProfileDir(GetProcessType(UTF8ToWide(process_type)));
}
std::wstring GetCrashDumpLocation() {
// In order to be able to start crash handling very early and in chrome_elf,
// we cannot rely on chrome's PathService entries (for DIR_CRASH_DUMPS) being
// available on Windows. See https://crbug.com/564398.
std::wstring user_data_dir;
bool ret = GetUserDataDirectory(&user_data_dir, nullptr);
assert(ret);
IgnoreUnused(ret);
return user_data_dir.append(L"\\Crashpad");
}
std::string GetEnvironmentString(const std::string& variable_name) {
return WideToUTF8(GetEnvironmentString(UTF8ToWide(variable_name).c_str()));
}
std::wstring GetEnvironmentString(const wchar_t* variable_name) {
DWORD value_length = ::GetEnvironmentVariableW(variable_name, nullptr, 0);
if (!value_length)
return std::wstring();
std::wstring value(value_length, L'\0');
value_length =
::GetEnvironmentVariableW(variable_name, &value[0], value_length);
if (!value_length || value_length >= value.size())
return std::wstring();
value.resize(value_length);
return value;
}
bool SetEnvironmentString(const std::string& variable_name,
const std::string& new_value) {
return SetEnvironmentString(UTF8ToWide(variable_name), UTF8ToWide(new_value));
}
bool SetEnvironmentString(const std::wstring& variable_name,
const std::wstring& new_value) {
return !!SetEnvironmentVariable(variable_name.c_str(), new_value.c_str());
}
bool HasEnvironmentVariable(const std::string& variable_name) {
return HasEnvironmentVariable(UTF8ToWide(variable_name));
}
bool HasEnvironmentVariable(const std::wstring& variable_name) {
return !!::GetEnvironmentVariable(variable_name.c_str(), nullptr, 0);
}
void GetExecutableVersionDetails(const std::wstring& exe_path,
std::wstring* product_name,
std::wstring* version,
std::wstring* special_build,
std::wstring* channel_name) {
assert(product_name);
assert(version);
assert(special_build);
assert(channel_name);
// Default values in case we don't find a version resource.
*product_name = L"Chrome";
*version = L"0.0.0.0-devel";
special_build->clear();
DWORD dummy = 0;
DWORD length = ::GetFileVersionInfoSize(exe_path.c_str(), &dummy);
if (length) {
std::unique_ptr<char[]> data(new char[length]);
if (::GetFileVersionInfo(exe_path.c_str(), dummy, length, data.get())) {
GetValueFromVersionResource(data.get(), L"ProductVersion", version);
std::wstring official_build;
GetValueFromVersionResource(data.get(), L"Official Build",
&official_build);
if (official_build != L"1")
version->append(L"-devel");
GetValueFromVersionResource(data.get(), L"ProductShortName",
product_name);
GetValueFromVersionResource(data.get(), L"SpecialBuild", special_build);
}
}
*channel_name = GetChromeChannelName(/*with_extended_stable=*/true);
}
version_info::Channel GetChromeChannel() {
#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
std::wstring channel_name(
GetChromeChannelName(/*with_extended_stable=*/false));
if (channel_name.empty()) {
return version_info::Channel::STABLE;
}
if (channel_name == L"beta") {
return version_info::Channel::BETA;
}
if (channel_name == L"dev") {
return version_info::Channel::DEV;
}
if (channel_name == L"canary") {
return version_info::Channel::CANARY;
}
#endif
return version_info::Channel::UNKNOWN;
}
std::wstring GetChromeChannelName(bool with_extended_stable) {
if (with_extended_stable && IsExtendedStableChannel())
return L"extended";
return InstallDetails::Get().channel();
}
bool IsExtendedStableChannel() {
return InstallDetails::Get().is_extended_stable_channel();
}
std::string WideToUTF8(const std::wstring& source) {
if (source.empty() ||
static_cast<int>(source.size()) > std::numeric_limits<int>::max()) {
return std::string();
}
int size = ::WideCharToMultiByte(CP_UTF8, 0, &source[0],
static_cast<int>(source.size()), nullptr, 0,
nullptr, nullptr);
std::string result(size, '\0');
if (::WideCharToMultiByte(CP_UTF8, 0, &source[0],
static_cast<int>(source.size()), &result[0], size,
nullptr, nullptr) != size) {
assert(false);
return std::string();
}
return result;
}
std::wstring UTF8ToWide(const std::string& source) {
if (source.empty() ||
static_cast<int>(source.size()) > std::numeric_limits<int>::max()) {
return std::wstring();
}
int size = ::MultiByteToWideChar(CP_UTF8, 0, &source[0],
static_cast<int>(source.size()), nullptr, 0);
std::wstring result(size, L'\0');
if (::MultiByteToWideChar(CP_UTF8, 0, &source[0],
static_cast<int>(source.size()), &result[0],
size) != size) {
assert(false);
return std::wstring();
}
return result;
}
std::vector<std::string> TokenizeString(const std::string& str,
char delimiter,
bool trim_spaces) {
return TokenizeStringT(str, delimiter, trim_spaces);
}
std::vector<std::wstring> TokenizeString(const std::wstring& str,
wchar_t delimiter,
bool trim_spaces) {
return TokenizeStringT(str, delimiter, trim_spaces);
}
std::vector<std::wstring> TokenizeCommandLineToArray(
const std::wstring& command_line) {
// This is baroquely complex to do properly, see e.g.
// https://blogs.msdn.microsoft.com/oldnewthing/20100917-00/?p=12833
// http://www.windowsinspired.com/how-a-windows-programs-splits-its-command-line-into-individual-arguments/
// and many others. We cannot use CommandLineToArgvW() in chrome_elf, because
// it's in shell32.dll. Previously, __wgetmainargs() in the CRT was available,
// and it's still documented for VS 2015 at
// https://msdn.microsoft.com/en-us/library/ff770599.aspx but unfortunately,
// isn't actually available.
//
// This parsing matches CommandLineToArgvW()s for arguments, rather than the
// CRTs. These are different only in the most obscure of cases and will not
// matter in any practical situation. See the windowsinspired.com post above
// for details.
//
// Indicates whether or not space and tab are interpreted as token separators.
enum class SpecialChars {
// Space or tab, if encountered, delimit tokens.
kInterpret,
// Space or tab, if encountered, are part of the current token.
kIgnore,
} state;
static constexpr wchar_t kSpaceTab[] = L" \t";
std::vector<std::wstring> result;
const wchar_t* p = command_line.c_str();
// The first argument (the program) is delimited by whitespace or quotes based
// on its first character.
size_t argv0_length = 0;
if (p[0] == L'"') {
const wchar_t* closing = wcschr(++p, L'"');
if (!closing)
argv0_length = command_line.size() - 1; // Skip the opening quote.
else
argv0_length = closing - (command_line.c_str() + 1);
} else {
argv0_length = wcscspn(p, kSpaceTab);
}
result.emplace_back(p, argv0_length);
if (p[argv0_length] == 0)
return result;
p += argv0_length + 1;
std::wstring token;
// This loops the entire string, with a subloop for each argument.
for (;;) {
// Advance past leading whitespace (only space and tab are handled).
p += wcsspn(p, kSpaceTab);
// End of arguments.
if (p[0] == 0)
break;
state = SpecialChars::kInterpret;
// Scan an argument.
for (;;) {
// Count and advance past collections of backslashes, which have special
// meaning when followed by a double quote.
int num_backslashes = wcsspn(p, L"\\");
p += num_backslashes;
if (p[0] == L'"') {
// Emit a backslash for each pair of backslashes found. A non-paired
// "extra" backslash is handled below.
token.append(num_backslashes / 2, L'\\');
if (num_backslashes % 2 == 1) {
// An odd number of backslashes followed by a quote is treated as
// pairs of protected backslashes, followed by the protected quote.
token += L'"';
} else if (p[1] == L'"' && state == SpecialChars::kIgnore) {
// Special case for consecutive double quotes within a quoted string:
// emit one for the pair, and switch back to interpreting special
// characters.
++p;
token += L'"';
state = SpecialChars::kInterpret;
} else {
state = state == SpecialChars::kInterpret ? SpecialChars::kIgnore
: SpecialChars::kInterpret;
}
} else {
// Emit backslashes that do not precede a quote verbatim.
token.append(num_backslashes, L'\\');
if (p[0] == 0 ||
(state == SpecialChars::kInterpret && wcschr(kSpaceTab, p[0]))) {
result.push_back(token);
token.clear();
break;
}
token += *p;
}
++p;
}
}
return result;
}
std::wstring GetSwitchValueFromCommandLine(const std::wstring& command_line,
const std::wstring& switch_name) {
static constexpr wchar_t kSwitchTerminator[] = L"--";
assert(!command_line.empty());
assert(!switch_name.empty());
std::vector<std::wstring> as_array = TokenizeCommandLineToArray(command_line);
std::wstring switch_with_equal = L"--" + switch_name + L"=";
auto end = std::find(as_array.cbegin(), as_array.cend(), kSwitchTerminator);
for (auto scan = as_array.cbegin(); scan != end; ++scan) {
const std::wstring& arg = *scan;
if (arg.compare(0, switch_with_equal.size(), switch_with_equal) == 0)
return arg.substr(switch_with_equal.size());
}
return std::wstring();
}
bool RecursiveDirectoryCreate(const std::wstring& full_path) {
// If the path exists, we've succeeded if it's a directory, failed otherwise.
const wchar_t* full_path_str = full_path.c_str();
DWORD file_attributes = ::GetFileAttributes(full_path_str);
if (file_attributes != INVALID_FILE_ATTRIBUTES) {
if ((file_attributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
Trace(L"%hs( %ls directory exists )\n", __func__, full_path_str);
return true;
}
Trace(L"%hs( %ls directory conflicts with an existing file. )\n", __func__,
full_path_str);
return false;
}
// Invariant: Path does not exist as file or directory.
// Attempt to create the parent recursively. This will immediately return
// true if it already exists, otherwise will create all required parent
// directories starting with the highest-level missing parent.
std::wstring parent_path;
std::size_t pos = full_path.find_last_of(L"/\\");
if (pos != std::wstring::npos) {
parent_path = full_path.substr(0, pos);
if (!RecursiveDirectoryCreate(parent_path)) {
Trace(L"Failed to create one of the parent directories");
return false;
}
}
if (!::CreateDirectory(full_path_str, nullptr)) {
DWORD error_code = ::GetLastError();
if (error_code == ERROR_ALREADY_EXISTS && DirectoryExists(full_path_str)) {
// This error code ERROR_ALREADY_EXISTS doesn't indicate whether we
// were racing with someone creating the same directory, or a file
// with the same path. If the directory exists, we lost the
// race to create the same directory.
return true;
} else {
Trace(L"Failed to create directory %ls, last error is %d\n",
full_path_str, error_code);
return false;
}
}
return true;
}
// This function takes these inputs rather than accessing the module's
// InstallDetails instance since it is used to bootstrap InstallDetails.
DetermineChannelResult DetermineChannel(const InstallConstants& mode,
bool system_level,
const wchar_t* channel_override,
std::wstring* update_ap,
std::wstring* update_cohort_name) {
#if !BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
return {std::wstring(), ChannelOrigin::kInstallMode,
/*is_extended_stable=*/false};
#else // !BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
// Cache the "ap" value if requested.
if (update_ap &&
!nt::QueryRegValueSZ(system_level ? nt::HKLM : nt::HKCU, nt::WOW6432,
GetClientStateKeyPath(mode.app_guid).c_str(), L"ap",
update_ap)) {
update_ap->erase();
}
// Cache the cohort name if requested.
if (update_cohort_name &&
!nt::QueryRegValueSZ(
system_level ? nt::HKLM : nt::HKCU, nt::WOW6432,
GetClientStateKeyPath(mode.app_guid).append(L"\\cohort").c_str(),
L"name", update_cohort_name)) {
update_cohort_name->erase();
}
switch (mode.channel_strategy) {
case ChannelStrategy::FLOATING: {
std::wstring channel_from_override;
bool is_extended_stable = false;
if (channel_override &&
GetChromeChannelNameFromString(
channel_override, channel_from_override, is_extended_stable)) {
return {std::move(channel_from_override), ChannelOrigin::kPolicy,
is_extended_stable};
}
[[fallthrough]]; // Return the default channel name for the mode.
}
case ChannelStrategy::FIXED:
return {mode.default_channel_name, ChannelOrigin::kInstallMode,
/*is_extended_stable=*/false};
}
#endif // !BUILDFLAG(USE_GOOGLE_UPDATE_INTEGRATION)
}
} // namespace install_static
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