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