chrome/browser/process_singleton_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/process_singleton.h"
   6
   7 #include <shellapi.h>
   8
   9 #include "base/base_paths.h"
  10 #include "base/bind.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file_path.h"
  13 #include "base/path_service.h"
  14 #include "base/process/kill.h"
  15 #include "base/process/process_info.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/stringprintf.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/time/time.h"
  20 #include "base/win/metro.h"
  21 #include "base/win/registry.h"
  22 #include "base/win/scoped_handle.h"
  23 #include "base/win/windows_version.h"
  24 #include "chrome/browser/browser_process.h"
  25 #include "chrome/browser/browser_process_platform_part.h"
  26 #include "chrome/browser/chrome_process_finder_win.h"
  27 #include "chrome/browser/metro_utils/metro_chrome_win.h"
  28 #include "chrome/browser/shell_integration.h"
  29 #include "chrome/browser/ui/simple_message_box.h"
  30 #include "chrome/common/chrome_constants.h"
  31 #include "chrome/common/chrome_paths.h"
  32 #include "chrome/common/chrome_paths_internal.h"
  33 #include "chrome/common/chrome_switches.h"
  34 #include "chrome/installer/util/wmi.h"
  35 #include "content/public/common/result_codes.h"
  36 #include "grit/chromium_strings.h"
  37 #include "grit/generated_resources.h"
  38 #include "net/base/escape.h"
  39 #include "ui/base/l10n/l10n_util.h"
  40 #include "ui/gfx/win/hwnd_util.h"
  41
  42 namespace {
  43
  44 const char kLockfile[] = "lockfile";
  45
  46 const int kMetroChromeActivationTimeoutMs = 3000;
  47
  48 // A helper class that acquires the given |mutex| while the AutoLockMutex is in
  49 // scope.
  50 class AutoLockMutex {
  51  public:
  52   explicit AutoLockMutex(HANDLE mutex) : mutex_(mutex) {
  53     DWORD result = ::WaitForSingleObject(mutex_, INFINITE);
  54     DPCHECK(result == WAIT_OBJECT_0) << "Result = " << result;
  55   }
  56
  57   ~AutoLockMutex() {
  58     BOOL released = ::ReleaseMutex(mutex_);
  59     DPCHECK(released);
  60   }
  61
  62  private:
  63   HANDLE mutex_;
  64   DISALLOW_COPY_AND_ASSIGN(AutoLockMutex);
  65 };
  66
  67 // A helper class that releases the given |mutex| while the AutoUnlockMutex is
  68 // in scope and immediately re-acquires it when going out of scope.
  69 class AutoUnlockMutex {
  70  public:
  71   explicit AutoUnlockMutex(HANDLE mutex) : mutex_(mutex) {
  72     BOOL released = ::ReleaseMutex(mutex_);
  73     DPCHECK(released);
  74   }
  75
  76   ~AutoUnlockMutex() {
  77     DWORD result = ::WaitForSingleObject(mutex_, INFINITE);
  78     DPCHECK(result == WAIT_OBJECT_0) << "Result = " << result;
  79   }
  80
  81  private:
  82   HANDLE mutex_;
  83   DISALLOW_COPY_AND_ASSIGN(AutoUnlockMutex);
  84 };
  85
  86 // Checks the visibility of the enumerated window and signals once a visible
  87 // window has been found.
  88 BOOL CALLBACK BrowserWindowEnumeration(HWND window, LPARAM param) {
  89   bool* result = reinterpret_cast<bool*>(param);
  90   *result = ::IsWindowVisible(window) != 0;
  91   // Stops enumeration if a visible window has been found.
  92   return !*result;
  93 }
  94
  95 bool ParseCommandLine(const COPYDATASTRUCT* cds,
  96                       CommandLine* parsed_command_line,
  97                       base::FilePath* current_directory) {
  98   // We should have enough room for the shortest command (min_message_size)
  99   // and also be a multiple of wchar_t bytes. The shortest command
 100   // possible is L"START\0\0" (empty current directory and command line).
 101   static const int min_message_size = 7;
 102   if (cds->cbData < min_message_size * sizeof(wchar_t) ||
 103       cds->cbData % sizeof(wchar_t) != 0) {
 104     LOG(WARNING) << "Invalid WM_COPYDATA, length = " << cds->cbData;
 105     return false;
 106   }
 107
 108   // We split the string into 4 parts on NULLs.
 109   DCHECK(cds->lpData);
 110   const std::wstring msg(static_cast<wchar_t*>(cds->lpData),
 111                          cds->cbData / sizeof(wchar_t));
 112   const std::wstring::size_type first_null = msg.find_first_of(L'\0');
 113   if (first_null == 0 || first_null == std::wstring::npos) {
 114     // no NULL byte, don't know what to do
 115     LOG(WARNING) << "Invalid WM_COPYDATA, length = " << msg.length() <<
 116       ", first null = " << first_null;
 117     return false;
 118   }
 119
 120   // Decode the command, which is everything until the first NULL.
 121   if (msg.substr(0, first_null) == L"START") {
 122     // Another instance is starting parse the command line & do what it would
 123     // have done.
 124     VLOG(1) << "Handling STARTUP request from another process";
 125     const std::wstring::size_type second_null =
 126         msg.find_first_of(L'\0', first_null + 1);
 127     if (second_null == std::wstring::npos ||
 128         first_null == msg.length() - 1 || second_null == msg.length()) {
 129       LOG(WARNING) << "Invalid format for start command, we need a string in 4 "
 130         "parts separated by NULLs";
 131       return false;
 132     }
 133
 134     // Get current directory.
 135     *current_directory = base::FilePath(msg.substr(first_null + 1,
 136                                                    second_null - first_null));
 137
 138     const std::wstring::size_type third_null =
 139         msg.find_first_of(L'\0', second_null + 1);
 140     if (third_null == std::wstring::npos ||
 141         third_null == msg.length()) {
 142       LOG(WARNING) << "Invalid format for start command, we need a string in 4 "
 143         "parts separated by NULLs";
 144     }
 145
 146     // Get command line.
 147     const std::wstring cmd_line =
 148         msg.substr(second_null + 1, third_null - second_null);
 149     *parsed_command_line = CommandLine::FromString(cmd_line);
 150     return true;
 151   }
 152   return false;
 153 }
 154
 155 bool ProcessLaunchNotification(
 156     const ProcessSingleton::NotificationCallback& notification_callback,
 157     UINT message,
 158     WPARAM wparam,
 159     LPARAM lparam,
 160     LRESULT* result) {
 161   if (message != WM_COPYDATA)
 162     return false;
 163
 164   // Handle the WM_COPYDATA message from another process.
 165   HWND hwnd = reinterpret_cast<HWND>(wparam);
 166   const COPYDATASTRUCT* cds = reinterpret_cast<COPYDATASTRUCT*>(lparam);
 167
 168   CommandLine parsed_command_line(CommandLine::NO_PROGRAM);
 169   base::FilePath current_directory;
 170   if (!ParseCommandLine(cds, &parsed_command_line, &current_directory)) {
 171     *result = TRUE;
 172     return true;
 173   }
 174
 175   *result = notification_callback.Run(parsed_command_line, current_directory) ?
 176       TRUE : FALSE;
 177   return true;
 178 }
 179
 180 // Returns true if Chrome needs to be relaunched into Windows 8 immersive mode.
 181 // Following conditions apply:-
 182 // 1. Windows 8 or greater.
 183 // 2. Not in Windows 8 immersive mode.
 184 // 3. Chrome is default browser.
 185 // 4. Process integrity level is not high.
 186 // 5. The profile data directory is the default directory.
 187 // 6. Last used mode was immersive/machine is a tablet.
 188 // TODO(ananta)
 189 // Move this function to a common place as the Windows 8 delegate_execute
 190 // handler can possibly use this.
 191 bool ShouldLaunchInWindows8ImmersiveMode(const base::FilePath& user_data_dir) {
 192 #if defined(USE_AURA)
 193   // Returning false from this function doesn't mean we don't launch immersive
 194   // mode in Aura. This function is specifically called in case when we need
 195   // to relaunch desktop launched chrome into immersive mode through 'relaunch'
 196   // menu. In case of Aura, we will use delegate_execute to do the relaunch.
 197   return false;
 198 #else
 199   if (base::win::GetVersion() < base::win::VERSION_WIN8)
 200     return false;
 201
 202   if (base::win::IsProcessImmersive(base::GetCurrentProcessHandle()))
 203     return false;
 204
 205   if (ShellIntegration::GetDefaultBrowser() != ShellIntegration::IS_DEFAULT)
 206     return false;
 207
 208   base::IntegrityLevel integrity_level = base::INTEGRITY_UNKNOWN;
 209   base::GetProcessIntegrityLevel(base::GetCurrentProcessHandle(),
 210                                  &integrity_level);
 211   if (integrity_level == base::HIGH_INTEGRITY)
 212     return false;
 213
 214   base::FilePath default_user_data_dir;
 215   if (!chrome::GetDefaultUserDataDirectory(&default_user_data_dir))
 216     return false;
 217
 218   if (default_user_data_dir != user_data_dir)
 219     return false;
 220
 221   base::win::RegKey reg_key;
 222   DWORD reg_value = 0;
 223   if (reg_key.Create(HKEY_CURRENT_USER, chrome::kMetroRegistryPath,
 224                      KEY_READ) == ERROR_SUCCESS &&
 225       reg_key.ReadValueDW(chrome::kLaunchModeValue,
 226                           &reg_value) == ERROR_SUCCESS) {
 227     return reg_value == 1;
 228   }
 229   return false;
 230 #endif
 231 }
 232
 233 }  // namespace
 234
 235 // Microsoft's Softricity virtualization breaks the sandbox processes.
 236 // So, if we detect the Softricity DLL we use WMI Win32_Process.Create to
 237 // break out of the virtualization environment.
 238 // http://code.google.com/p/chromium/issues/detail?id=43650
 239 bool ProcessSingleton::EscapeVirtualization(
 240     const base::FilePath& user_data_dir) {
 241   if (::GetModuleHandle(L"sftldr_wow64.dll") ||
 242       ::GetModuleHandle(L"sftldr.dll")) {
 243     int process_id;
 244     if (!installer::WMIProcess::Launch(::GetCommandLineW(), &process_id))
 245       return false;
 246     is_virtualized_ = true;
 247     // The new window was spawned from WMI, and won't be in the foreground.
 248     // So, first we sleep while the new chrome.exe instance starts (because
 249     // WaitForInputIdle doesn't work here). Then we poll for up to two more
 250     // seconds and make the window foreground if we find it (or we give up).
 251     HWND hwnd = 0;
 252     ::Sleep(90);
 253     for (int tries = 200; tries; --tries) {
 254       hwnd = chrome::FindRunningChromeWindow(user_data_dir);
 255       if (hwnd) {
 256         ::SetForegroundWindow(hwnd);
 257         break;
 258       }
 259       ::Sleep(10);
 260     }
 261     return true;
 262   }
 263   return false;
 264 }
 265
 266 ProcessSingleton::ProcessSingleton(
 267     const base::FilePath& user_data_dir,
 268     const NotificationCallback& notification_callback)
 269     : notification_callback_(notification_callback),
 270       is_virtualized_(false), lock_file_(INVALID_HANDLE_VALUE),
 271       user_data_dir_(user_data_dir) {
 272 }
 273
 274 ProcessSingleton::~ProcessSingleton() {
 275   if (lock_file_ != INVALID_HANDLE_VALUE)
 276     ::CloseHandle(lock_file_);
 277 }
 278
 279 // Code roughly based on Mozilla.
 280 ProcessSingleton::NotifyResult ProcessSingleton::NotifyOtherProcess() {
 281   if (is_virtualized_)
 282     return PROCESS_NOTIFIED;  // We already spawned the process in this case.
 283   if (lock_file_ == INVALID_HANDLE_VALUE && !remote_window_) {
 284     return LOCK_ERROR;
 285   } else if (!remote_window_) {
 286     return PROCESS_NONE;
 287   }
 288
 289   switch (chrome::AttemptToNotifyRunningChrome(remote_window_, false)) {
 290     case chrome::NOTIFY_SUCCESS:
 291       return PROCESS_NOTIFIED;
 292     case chrome::NOTIFY_FAILED:
 293       remote_window_ = NULL;
 294       return PROCESS_NONE;
 295     case chrome::NOTIFY_WINDOW_HUNG:
 296       remote_window_ = NULL;
 297       break;
 298   }
 299
 300   DWORD process_id = 0;
 301   DWORD thread_id = ::GetWindowThreadProcessId(remote_window_, &process_id);
 302   if (!thread_id || !process_id) {
 303     remote_window_ = NULL;
 304     return PROCESS_NONE;
 305   }
 306
 307   // The window is hung. Scan for every window to find a visible one.
 308   bool visible_window = false;
 309   ::EnumThreadWindows(thread_id,
 310                       &BrowserWindowEnumeration,
 311                       reinterpret_cast<LPARAM>(&visible_window));
 312
 313   // If there is a visible browser window, ask the user before killing it.
 314   if (visible_window &&
 315       chrome::ShowMessageBox(
 316           NULL,
 317           l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
 318           l10n_util::GetStringUTF16(IDS_BROWSER_HUNGBROWSER_MESSAGE),
 319           chrome::MESSAGE_BOX_TYPE_QUESTION) == chrome::MESSAGE_BOX_RESULT_NO) {
 320     // The user denied. Quit silently.
 321     return PROCESS_NOTIFIED;
 322   }
 323
 324   // Time to take action. Kill the browser process.
 325   base::KillProcessById(process_id, content::RESULT_CODE_HUNG, true);
 326   remote_window_ = NULL;
 327   return PROCESS_NONE;
 328 }
 329
 330 ProcessSingleton::NotifyResult
 331 ProcessSingleton::NotifyOtherProcessOrCreate() {
 332   ProcessSingleton::NotifyResult result = PROCESS_NONE;
 333   if (!Create()) {
 334     result = NotifyOtherProcess();
 335     if (result == PROCESS_NONE)
 336       result = PROFILE_IN_USE;
 337   } else {
 338     g_browser_process->platform_part()->PlatformSpecificCommandLineProcessing(
 339         *CommandLine::ForCurrentProcess());
 340   }
 341   return result;
 342 }
 343
 344 // Look for a Chrome instance that uses the same profile directory. If there
 345 // isn't one, create a message window with its title set to the profile
 346 // directory path.
 347 bool ProcessSingleton::Create() {
 348   static const wchar_t kMutexName[] = L"Local\\ChromeProcessSingletonStartup!";
 349   static const wchar_t kMetroActivationEventName[] =
 350       L"Local\\ChromeProcessSingletonStartupMetroActivation!";
 351
 352   remote_window_ = chrome::FindRunningChromeWindow(user_data_dir_);
 353   if (!remote_window_ && !EscapeVirtualization(user_data_dir_)) {
 354     // Make sure we will be the one and only process creating the window.
 355     // We use a named Mutex since we are protecting against multi-process
 356     // access. As documented, it's clearer to NOT request ownership on creation
 357     // since it isn't guaranteed we will get it. It is better to create it
 358     // without ownership and explicitly get the ownership afterward.
 359     base::win::ScopedHandle only_me(::CreateMutex(NULL, FALSE, kMutexName));
 360     DPCHECK(only_me.IsValid());
 361
 362     AutoLockMutex auto_lock_only_me(only_me);
 363
 364     // We now own the mutex so we are the only process that can create the
 365     // window at this time, but we must still check if someone created it
 366     // between the time where we looked for it above and the time the mutex
 367     // was given to us.
 368     remote_window_ = chrome::FindRunningChromeWindow(user_data_dir_);
 369
 370
 371     // In Win8+, a new Chrome process launched in Desktop mode may need to be
 372     // transmuted into Metro Chrome (see ShouldLaunchInWindows8ImmersiveMode for
 373     // heuristics). To accomplish this, the current Chrome activates Metro
 374     // Chrome, releases the startup mutex, and waits for metro Chrome to take
 375     // the singleton. From that point onward, the command line for this Chrome
 376     // process will be sent to Metro Chrome by the usual channels.
 377     if (!remote_window_ && base::win::GetVersion() >= base::win::VERSION_WIN8 &&
 378         !base::win::IsMetroProcess()) {
 379       // |metro_activation_event| is created right before activating a Metro
 380       // Chrome (note that there can only be one Metro Chrome process; by OS
 381       // design); all following Desktop processes will then wait for this event
 382       // to be signaled by Metro Chrome which will do so as soon as it grabs
 383       // this singleton (should any of the waiting processes timeout waiting for
 384       // the signal they will try to grab the singleton for themselves which
 385       // will result in a forced Desktop Chrome launch in the worst case).
 386       base::win::ScopedHandle metro_activation_event(
 387           ::OpenEvent(SYNCHRONIZE, FALSE, kMetroActivationEventName));
 388       if (!metro_activation_event.IsValid() &&
 389           ShouldLaunchInWindows8ImmersiveMode(user_data_dir_)) {
 390         // No Metro activation is under way, but the desire is to launch in
 391         // Metro mode: activate and rendez-vous with the activated process.
 392         metro_activation_event.Set(
 393             ::CreateEvent(NULL, TRUE, FALSE, kMetroActivationEventName));
 394         if (!chrome::ActivateMetroChrome()) {
 395           // Failed to launch immersive Chrome, default to launching on Desktop.
 396           LOG(ERROR) << "Failed to launch immersive chrome";
 397           metro_activation_event.Close();
 398         }
 399       }
 400
 401       if (metro_activation_event.IsValid()) {
 402         // Release |only_me| (to let Metro Chrome grab this singleton) and wait
 403         // until the event is signaled (i.e. Metro Chrome was successfully
 404         // activated). Ignore timeout waiting for |metro_activation_event|.
 405         {
 406           AutoUnlockMutex auto_unlock_only_me(only_me);
 407
 408           DWORD result = ::WaitForSingleObject(metro_activation_event,
 409                                                kMetroChromeActivationTimeoutMs);
 410           DPCHECK(result == WAIT_OBJECT_0 || result == WAIT_TIMEOUT)
 411               << "Result = " << result;
 412         }
 413
 414         // Check if this singleton was successfully grabbed by another process
 415         // (hopefully Metro Chrome). Failing to do so, this process will grab
 416         // the singleton and launch in Desktop mode.
 417         remote_window_ = chrome::FindRunningChromeWindow(user_data_dir_);
 418       }
 419     }
 420
 421     if (!remote_window_) {
 422       // We have to make sure there is no Chrome instance running on another
 423       // machine that uses the same profile.
 424       base::FilePath lock_file_path = user_data_dir_.AppendASCII(kLockfile);
 425       lock_file_ = ::CreateFile(lock_file_path.value().c_str(),
 426                                 GENERIC_WRITE,
 427                                 FILE_SHARE_READ,
 428                                 NULL,
 429                                 CREATE_ALWAYS,
 430                                 FILE_ATTRIBUTE_NORMAL |
 431                                 FILE_FLAG_DELETE_ON_CLOSE,
 432                                 NULL);
 433       DWORD error = ::GetLastError();
 434       LOG_IF(WARNING, lock_file_ != INVALID_HANDLE_VALUE &&
 435           error == ERROR_ALREADY_EXISTS) << "Lock file exists but is writable.";
 436       LOG_IF(ERROR, lock_file_ == INVALID_HANDLE_VALUE)
 437           << "Lock file can not be created! Error code: " << error;
 438
 439       if (lock_file_ != INVALID_HANDLE_VALUE) {
 440         // Set the window's title to the path of our user data directory so
 441         // other Chrome instances can decide if they should forward to us.
 442         bool result = window_.CreateNamed(
 443             base::Bind(&ProcessLaunchNotification, notification_callback_),
 444             user_data_dir_.value());
 445         CHECK(result && window_.hwnd());
 446       }
 447
 448       if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
 449         // Make sure no one is still waiting on Metro activation whether it
 450         // succeeded (i.e., this is the Metro process) or failed.
 451         base::win::ScopedHandle metro_activation_event(
 452             ::OpenEvent(EVENT_MODIFY_STATE, FALSE, kMetroActivationEventName));
 453         if (metro_activation_event.IsValid())
 454           ::SetEvent(metro_activation_event);
 455       }
 456     }
 457   }
 458
 459   return window_.hwnd() != NULL;
 460 }
 461
 462 void ProcessSingleton::Cleanup() {
 463 }