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      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 "cloud_print/virtual_driver/win/port_monitor/port_monitor.h"
      6 
      7 #include <lmcons.h>
      8 #include <shellapi.h>
      9 #include <shlobj.h>
     10 #include <strsafe.h>
     11 #include <userenv.h>
     12 #include <windows.h>
     13 #include <winspool.h>
     14 
     15 #include "base/at_exit.h"
     16 #include "base/command_line.h"
     17 #include "base/file_util.h"
     18 #include "base/files/file_enumerator.h"
     19 #include "base/logging.h"
     20 #include "base/path_service.h"
     21 #include "base/process/process.h"
     22 #include "base/process/launch.h"
     23 #include "base/strings/string16.h"
     24 #include "base/win/registry.h"
     25 #include "base/win/scoped_handle.h"
     26 #include "base/win/windows_version.h"
     27 #include "chrome/common/chrome_switches.h"
     28 #include "chrome/installer/launcher_support/chrome_launcher_support.h"
     29 #include "cloud_print/common/win/cloud_print_utils.h"
     30 #include "cloud_print/virtual_driver/win/port_monitor/spooler_win.h"
     31 #include "cloud_print/virtual_driver/win/virtual_driver_consts.h"
     32 #include "cloud_print/virtual_driver/win/virtual_driver_helpers.h"
     33 
     34 namespace cloud_print {
     35 
     36 namespace {
     37 
     38 const wchar_t kIePath[] = L"Internet Explorer\\iexplore.exe";
     39 
     40 const char kChromeInstallUrl[] =
     41     "http://google.com/cloudprint/learn/chrome.html";
     42 
     43 const wchar_t kCloudPrintRegKey[] = L"Software\\Google\\CloudPrint";
     44 
     45 const wchar_t kXpsMimeType[] = L"application/vnd.ms-xpsdocument";
     46 
     47 const wchar_t kAppDataDir[] = L"Google\\Cloud Printer";
     48 
     49 struct MonitorData {
     50   scoped_ptr<base::AtExitManager> at_exit_manager;
     51 };
     52 
     53 struct PortData {
     54   PortData() : job_id(0), printer_handle(NULL), file(0) {
     55   }
     56   ~PortData() {
     57     Close();
     58   }
     59   void Close() {
     60     if (printer_handle) {
     61       ClosePrinter(printer_handle);
     62       printer_handle = NULL;
     63     }
     64     if (file) {
     65       base::CloseFile(file);
     66       file = NULL;
     67     }
     68   }
     69   DWORD job_id;
     70   HANDLE printer_handle;
     71   FILE* file;
     72   base::FilePath file_path;
     73 };
     74 
     75 typedef struct {
     76   ACCESS_MASK granted_access;
     77 } XcvUiData;
     78 
     79 
     80 MONITORUI g_monitor_ui = {
     81   sizeof(MONITORUI),
     82   MonitorUiAddPortUi,
     83   MonitorUiConfigureOrDeletePortUI,
     84   MonitorUiConfigureOrDeletePortUI
     85 };
     86 
     87 MONITOR2 g_monitor_2 = {
     88   sizeof(MONITOR2),
     89   Monitor2EnumPorts,
     90   Monitor2OpenPort,
     91   NULL,           // OpenPortEx is not supported.
     92   Monitor2StartDocPort,
     93   Monitor2WritePort,
     94   Monitor2ReadPort,
     95   Monitor2EndDocPort,
     96   Monitor2ClosePort,
     97   NULL,           // AddPort is not supported.
     98   NULL,           // AddPortEx is not supported.
     99   NULL,           // ConfigurePort is not supported.
    100   NULL,           // DeletePort is not supported.
    101   NULL,
    102   NULL,           // SetPortTimeOuts is not supported.
    103   Monitor2XcvOpenPort,
    104   Monitor2XcvDataPort,
    105   Monitor2XcvClosePort,
    106   Monitor2Shutdown
    107 };
    108 
    109 base::FilePath GetAppDataDir() {
    110   base::FilePath file_path;
    111   base::win::Version version = base::win::GetVersion();
    112   int path_id = (version >= base::win::VERSION_VISTA) ?
    113                 base::DIR_LOCAL_APP_DATA_LOW : base::DIR_LOCAL_APP_DATA;
    114   if (!PathService::Get(path_id, &file_path)) {
    115     LOG(ERROR) << "Can't get DIR_LOCAL_APP_DATA";
    116     return base::FilePath();
    117   }
    118   return file_path.Append(kAppDataDir);
    119 }
    120 
    121 // Delete files which where not deleted by chrome.
    122 void DeleteLeakedFiles(const base::FilePath& dir) {
    123   base::Time delete_before = base::Time::Now() - base::TimeDelta::FromDays(1);
    124   base::FileEnumerator enumerator(dir, false, base::FileEnumerator::FILES);
    125   for (base::FilePath file_path = enumerator.Next(); !file_path.empty();
    126        file_path = enumerator.Next()) {
    127     if (enumerator.GetInfo().GetLastModifiedTime() < delete_before)
    128       base::DeleteFile(file_path, false);
    129   }
    130 }
    131 
    132 // Attempts to retrieve the title of the specified print job.
    133 // On success returns TRUE and the first title_chars characters of the job title
    134 // are copied into title.
    135 // On failure returns FALSE and title is unmodified.
    136 bool GetJobTitle(HANDLE printer_handle,
    137                  DWORD job_id,
    138                  base::string16 *title) {
    139   DCHECK(printer_handle != NULL);
    140   DCHECK(title != NULL);
    141   DWORD bytes_needed = 0;
    142   GetJob(printer_handle, job_id, 1, NULL, 0, &bytes_needed);
    143   if (bytes_needed == 0) {
    144     LOG(ERROR) << "Unable to get bytes needed for job info.";
    145     return false;
    146   }
    147   scoped_ptr<BYTE[]> buffer(new BYTE[bytes_needed]);
    148   if (!GetJob(printer_handle,
    149               job_id,
    150               1,
    151               buffer.get(),
    152               bytes_needed,
    153               &bytes_needed)) {
    154     LOG(ERROR) << "Unable to get job info.";
    155     return false;
    156   }
    157   JOB_INFO_1* job_info = reinterpret_cast<JOB_INFO_1*>(buffer.get());
    158   *title = job_info->pDocument;
    159   return true;
    160 }
    161 
    162 // Handler for the UI functions exported by the port monitor.
    163 // Verifies that a valid parent Window exists and then just displays an
    164 // error message to let the user know that there is no interactive
    165 // configuration.
    166 void HandlePortUi(HWND hwnd, const base::string16& caption) {
    167   if (hwnd != NULL && IsWindow(hwnd)) {
    168     DisplayWindowsMessage(hwnd, CO_E_NOT_SUPPORTED, cloud_print::kPortName);
    169   }
    170 }
    171 
    172 // Gets the primary token for the user that submitted the print job.
    173 bool GetUserToken(HANDLE* primary_token) {
    174   HANDLE token = NULL;
    175   if (!OpenThreadToken(GetCurrentThread(),
    176                       TOKEN_QUERY|TOKEN_DUPLICATE|TOKEN_ASSIGN_PRIMARY,
    177                       FALSE,
    178                       &token)) {
    179     LOG(ERROR) << "Unable to get thread token.";
    180     return false;
    181   }
    182   base::win::ScopedHandle token_scoped(token);
    183   if (!DuplicateTokenEx(token,
    184                         TOKEN_QUERY|TOKEN_DUPLICATE|TOKEN_ASSIGN_PRIMARY,
    185                         NULL,
    186                         SecurityImpersonation,
    187                         TokenPrimary,
    188                         primary_token)) {
    189     LOG(ERROR) << "Unable to get primary thread token.";
    190     return false;
    191   }
    192   return true;
    193 }
    194 
    195 // Launches the Cloud Print dialog in Chrome.
    196 // xps_path references a file to print.
    197 // job_title is the title to be used for the resulting print job.
    198 bool LaunchPrintDialog(const base::FilePath& xps_path,
    199                        const base::string16& job_title) {
    200   HANDLE token = NULL;
    201   if (!GetUserToken(&token)) {
    202     LOG(ERROR) << "Unable to get user token.";
    203     return false;
    204   }
    205   base::win::ScopedHandle primary_token_scoped(token);
    206 
    207   base::FilePath chrome_path = GetChromeExePath();
    208   if (chrome_path.empty()) {
    209     LOG(ERROR) << "Unable to get chrome exe path.";
    210     return false;
    211   }
    212 
    213   CommandLine command_line(chrome_path);
    214 
    215   base::FilePath chrome_profile = GetChromeProfilePath();
    216   if (!chrome_profile.empty())
    217     command_line.AppendSwitchPath(switches::kUserDataDir, chrome_profile);
    218 
    219   command_line.AppendSwitchPath(switches::kCloudPrintFile, xps_path);
    220   command_line.AppendSwitchNative(switches::kCloudPrintFileType, kXpsMimeType);
    221   command_line.AppendSwitchNative(switches::kCloudPrintJobTitle, job_title);
    222   base::LaunchOptions options;
    223   options.as_user = primary_token_scoped;
    224   base::LaunchProcess(command_line, options, NULL);
    225   return true;
    226 }
    227 
    228 // Launches a page to allow the user to download chrome.
    229 // TODO(abodenha (at) chromium.org) Point to a custom page explaining what's wrong
    230 // rather than the generic chrome download page.  See
    231 // http://code.google.com/p/chromium/issues/detail?id=112019
    232 void LaunchChromeDownloadPage() {
    233   if (kIsUnittest)
    234     return;
    235   HANDLE token = NULL;
    236   if (!GetUserToken(&token)) {
    237     LOG(ERROR) << "Unable to get user token.";
    238     return;
    239   }
    240   base::win::ScopedHandle token_scoped(token);
    241 
    242   base::FilePath ie_path;
    243   PathService::Get(base::DIR_PROGRAM_FILESX86, &ie_path);
    244   ie_path = ie_path.Append(kIePath);
    245   CommandLine command_line(ie_path);
    246   command_line.AppendArg(kChromeInstallUrl);
    247 
    248   base::LaunchOptions options;
    249   options.as_user = token_scoped;
    250   base::LaunchProcess(command_line, options, NULL);
    251 }
    252 
    253 // Returns false if the print job is being run in a context
    254 // that shouldn't be launching Chrome.
    255 bool ValidateCurrentUser() {
    256   HANDLE token = NULL;
    257   if (!GetUserToken(&token)) {
    258     // If we can't get the token we're probably not impersonating
    259     // the user, so validation should fail.
    260     return false;
    261   }
    262   base::win::ScopedHandle token_scoped(token);
    263 
    264   if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
    265     DWORD session_id = 0;
    266     DWORD dummy;
    267     if (!GetTokenInformation(token_scoped,
    268                              TokenSessionId,
    269                              reinterpret_cast<void *>(&session_id),
    270                              sizeof(DWORD),
    271                              &dummy)) {
    272       return false;
    273     }
    274     if (session_id == 0) {
    275       return false;
    276     }
    277   }
    278   return true;
    279 }
    280 }  // namespace
    281 
    282 base::FilePath ReadPathFromRegistry(HKEY root, const wchar_t* path_name) {
    283   base::win::RegKey gcp_key(HKEY_CURRENT_USER, kCloudPrintRegKey, KEY_READ);
    284   base::string16 data;
    285   if (SUCCEEDED(gcp_key.ReadValue(path_name, &data)) &&
    286       base::PathExists(base::FilePath(data))) {
    287     return base::FilePath(data);
    288   }
    289   return base::FilePath();
    290 }
    291 
    292 base::FilePath ReadPathFromAnyRegistry(const wchar_t* path_name) {
    293   base::FilePath result = ReadPathFromRegistry(HKEY_CURRENT_USER, path_name);
    294   if (!result.empty())
    295     return result;
    296   return ReadPathFromRegistry(HKEY_LOCAL_MACHINE, path_name);
    297 }
    298 
    299 base::FilePath GetChromeExePath() {
    300   base::FilePath path = ReadPathFromAnyRegistry(kChromeExePathRegValue);
    301   if (!path.empty())
    302     return path;
    303   return chrome_launcher_support::GetAnyChromePath();
    304 }
    305 
    306 base::FilePath GetChromeProfilePath() {
    307   base::FilePath path = ReadPathFromAnyRegistry(kChromeProfilePathRegValue);
    308   if (!path.empty() && base::DirectoryExists(path))
    309     return path;
    310   return base::FilePath();
    311 }
    312 
    313 BOOL WINAPI Monitor2EnumPorts(HANDLE,
    314                               wchar_t*,
    315                               DWORD level,
    316                               BYTE*  ports,
    317                               DWORD   ports_size,
    318                               DWORD* needed_bytes,
    319                               DWORD* returned) {
    320   if (needed_bytes == NULL) {
    321     LOG(ERROR) << "needed_bytes should not be NULL.";
    322     SetLastError(ERROR_INVALID_PARAMETER);
    323     return FALSE;
    324   }
    325   if (level == 1) {
    326     *needed_bytes = sizeof(PORT_INFO_1);
    327   } else if (level == 2) {
    328     *needed_bytes = sizeof(PORT_INFO_2);
    329   } else {
    330     LOG(ERROR) << "Level "  << level << "is not supported.";
    331     SetLastError(ERROR_INVALID_LEVEL);
    332     return FALSE;
    333   }
    334   *needed_bytes += static_cast<DWORD>(cloud_print::kPortNameSize);
    335   if (ports_size < *needed_bytes) {
    336     LOG(WARNING) << *needed_bytes << " bytes are required.  Only "
    337                  << ports_size << " were allocated.";
    338     SetLastError(ERROR_INSUFFICIENT_BUFFER);
    339     return FALSE;
    340   }
    341   if (ports == NULL) {
    342     LOG(ERROR) << "ports should not be NULL.";
    343     SetLastError(ERROR_INVALID_PARAMETER);
    344     return FALSE;
    345   }
    346   if (returned == NULL) {
    347     LOG(ERROR) << "returned should not be NULL.";
    348     SetLastError(ERROR_INVALID_PARAMETER);
    349     return FALSE;
    350   }
    351 
    352   // Windows expects any strings refernced by PORT_INFO_X structures to
    353   // appear at the END of the buffer referenced by ports.  Placing
    354   // strings immediately after the PORT_INFO_X structure will cause
    355   // EnumPorts to fail until the spooler is restarted.
    356   // This is NOT mentioned in the documentation.
    357   wchar_t* string_target =
    358       reinterpret_cast<wchar_t*>(ports + ports_size -
    359       cloud_print::kPortNameSize);
    360   if (level == 1) {
    361     PORT_INFO_1* port_info = reinterpret_cast<PORT_INFO_1*>(ports);
    362     port_info->pName = string_target;
    363     StringCbCopy(port_info->pName,
    364                  cloud_print::kPortNameSize,
    365                  cloud_print::kPortName);
    366   } else {
    367     PORT_INFO_2* port_info = reinterpret_cast<PORT_INFO_2*>(ports);
    368     port_info->pPortName = string_target;
    369     StringCbCopy(port_info->pPortName,
    370                  cloud_print::kPortNameSize,
    371                  cloud_print::kPortName);
    372     port_info->pMonitorName = NULL;
    373     port_info->pDescription = NULL;
    374     port_info->fPortType = PORT_TYPE_WRITE;
    375     port_info->Reserved = 0;
    376   }
    377   *returned = 1;
    378   return TRUE;
    379 }
    380 
    381 BOOL WINAPI Monitor2OpenPort(HANDLE, wchar_t*, HANDLE* handle) {
    382   if (handle == NULL) {
    383     LOG(ERROR) << "handle should not be NULL.";
    384     SetLastError(ERROR_INVALID_PARAMETER);
    385     return FALSE;
    386   }
    387   *handle = new PortData();
    388   return TRUE;
    389 }
    390 
    391 BOOL WINAPI Monitor2StartDocPort(HANDLE port_handle,
    392                                  wchar_t* printer_name,
    393                                  DWORD job_id,
    394                                  DWORD,
    395                                  BYTE*) {
    396   SetGoogleUpdateUsage(kGoogleUpdateProductId);
    397   if (port_handle == NULL) {
    398     LOG(ERROR) << "port_handle should not be NULL.";
    399     SetLastError(ERROR_INVALID_PARAMETER);
    400     return FALSE;
    401   }
    402   if (printer_name == NULL) {
    403     LOG(ERROR) << "printer_name should not be NULL.";
    404     SetLastError(ERROR_INVALID_PARAMETER);
    405     return FALSE;
    406   }
    407   if (!ValidateCurrentUser()) {
    408     // TODO(abodenha (at) chromium.org) Abort the print job.
    409     return FALSE;
    410   }
    411   PortData* port_data = reinterpret_cast<PortData*>(port_handle);
    412   port_data->job_id = job_id;
    413   if (!OpenPrinter(printer_name, &(port_data->printer_handle), NULL)) {
    414     LOG(WARNING) << "Unable to open printer " << printer_name << ".";
    415     // We can continue without a handle to the printer.
    416     // It just means we can't get the job title or tell the spooler that
    417     // the print job is complete.
    418     // This is the normal flow during a unit test.
    419     port_data->printer_handle = NULL;
    420   }
    421   base::FilePath& file_path = port_data->file_path;
    422   base::FilePath app_data_dir = GetAppDataDir();
    423   if (app_data_dir.empty())
    424     return FALSE;
    425   DeleteLeakedFiles(app_data_dir);
    426   if (!base::CreateDirectory(app_data_dir) ||
    427       !base::CreateTemporaryFileInDir(app_data_dir, &file_path)) {
    428     LOG(ERROR) << "Can't create temporary file in " << app_data_dir.value();
    429     return FALSE;
    430   }
    431   port_data->file = base::OpenFile(file_path, "wb+");
    432   if (port_data->file == NULL) {
    433     LOG(ERROR) << "Error opening file " << file_path.value() << ".";
    434     return FALSE;
    435   }
    436   return TRUE;
    437 }
    438 
    439 BOOL WINAPI Monitor2WritePort(HANDLE port_handle,
    440                               BYTE* buffer,
    441                               DWORD buffer_size,
    442                               DWORD* bytes_written) {
    443   PortData* port_data = reinterpret_cast<PortData*>(port_handle);
    444   if (!ValidateCurrentUser()) {
    445     // TODO(abodenha (at) chromium.org) Abort the print job.
    446     return FALSE;
    447   }
    448   *bytes_written =
    449       static_cast<DWORD>(fwrite(buffer, 1, buffer_size, port_data->file));
    450   if (*bytes_written > 0) {
    451     return TRUE;
    452   } else {
    453     return FALSE;
    454   }
    455 }
    456 
    457 BOOL WINAPI Monitor2ReadPort(HANDLE, BYTE*, DWORD, DWORD* read_bytes) {
    458   LOG(ERROR) << "Read is not supported.";
    459   *read_bytes = 0;
    460   SetLastError(ERROR_NOT_SUPPORTED);
    461   return FALSE;
    462 }
    463 
    464 BOOL WINAPI Monitor2EndDocPort(HANDLE port_handle) {
    465   if (!ValidateCurrentUser()) {
    466     // TODO(abodenha (at) chromium.org) Abort the print job.
    467     return FALSE;
    468   }
    469   PortData* port_data = reinterpret_cast<PortData*>(port_handle);
    470   if (port_data == NULL) {
    471     SetLastError(ERROR_INVALID_PARAMETER);
    472     return FALSE;
    473   }
    474 
    475   if (port_data->file != NULL) {
    476     base::CloseFile(port_data->file);
    477     port_data->file = NULL;
    478     bool delete_file = true;
    479     int64 file_size = 0;
    480     base::GetFileSize(port_data->file_path, &file_size);
    481     if (file_size > 0) {
    482       base::string16 job_title;
    483       if (port_data->printer_handle != NULL) {
    484         GetJobTitle(port_data->printer_handle,
    485                     port_data->job_id,
    486                     &job_title);
    487       }
    488       if (!LaunchPrintDialog(port_data->file_path, job_title)) {
    489         LaunchChromeDownloadPage();
    490       } else {
    491         delete_file = false;
    492       }
    493     }
    494     if (delete_file)
    495       base::DeleteFile(port_data->file_path, false);
    496   }
    497   if (port_data->printer_handle != NULL) {
    498     // Tell the spooler that the job is complete.
    499     SetJob(port_data->printer_handle,
    500            port_data->job_id,
    501            0,
    502            NULL,
    503            JOB_CONTROL_SENT_TO_PRINTER);
    504   }
    505   port_data->Close();
    506   // Return success even if we can't display the dialog.
    507   // TODO(abodenha (at) chromium.org) Come up with a better way of handling
    508   // this situation.
    509   return TRUE;
    510 }
    511 
    512 BOOL WINAPI Monitor2ClosePort(HANDLE port_handle) {
    513   if (port_handle == NULL) {
    514     LOG(ERROR) << "port_handle should not be NULL.";
    515     SetLastError(ERROR_INVALID_PARAMETER);
    516     return FALSE;
    517   }
    518   PortData* port_data = reinterpret_cast<PortData*>(port_handle);
    519   delete port_data;
    520   return TRUE;
    521 }
    522 
    523 VOID WINAPI Monitor2Shutdown(HANDLE monitor_handle) {
    524   if (monitor_handle != NULL) {
    525     MonitorData* monitor_data =
    526       reinterpret_cast<MonitorData*>(monitor_handle);
    527     delete monitor_handle;
    528   }
    529 }
    530 
    531 BOOL WINAPI Monitor2XcvOpenPort(HANDLE,
    532                                 const wchar_t*,
    533                                 ACCESS_MASK granted_access,
    534                                 HANDLE* handle) {
    535   if (handle == NULL) {
    536     LOG(ERROR) << "handle should not be NULL.";
    537     SetLastError(ERROR_INVALID_PARAMETER);
    538     return FALSE;
    539   }
    540   XcvUiData* xcv_data = new XcvUiData();
    541   xcv_data->granted_access = granted_access;
    542   *handle = xcv_data;
    543   return TRUE;
    544 }
    545 
    546 DWORD WINAPI Monitor2XcvDataPort(HANDLE xcv_handle,
    547                                  const wchar_t* data_name,
    548                                  BYTE*,
    549                                  DWORD,
    550                                  BYTE* output_data,
    551                                  DWORD output_data_bytes,
    552                                  DWORD* output_data_bytes_needed) {
    553   XcvUiData* xcv_data = reinterpret_cast<XcvUiData*>(xcv_handle);
    554   DWORD ret_val = ERROR_SUCCESS;
    555   if ((xcv_data->granted_access & SERVER_ACCESS_ADMINISTER) == 0) {
    556     return ERROR_ACCESS_DENIED;
    557   }
    558   if (output_data == NULL || output_data_bytes == 0) {
    559     return ERROR_INVALID_PARAMETER;
    560   }
    561   // We don't handle AddPort or DeletePort since we don't support
    562   // dynamic creation of ports.
    563   if (lstrcmp(L"MonitorUI", data_name) == 0) {
    564     DWORD dll_path_len = 0;
    565     base::FilePath dll_path(GetPortMonitorDllName());
    566     dll_path_len = static_cast<DWORD>(dll_path.value().length());
    567     if (output_data_bytes_needed != NULL) {
    568       *output_data_bytes_needed = dll_path_len;
    569     }
    570     if (output_data_bytes < dll_path_len) {
    571         return ERROR_INSUFFICIENT_BUFFER;
    572     } else {
    573         ret_val = StringCbCopy(reinterpret_cast<wchar_t*>(output_data),
    574                                output_data_bytes,
    575                                dll_path.value().c_str());
    576     }
    577   } else {
    578     return ERROR_INVALID_PARAMETER;
    579   }
    580   return ret_val;
    581 }
    582 
    583 BOOL WINAPI Monitor2XcvClosePort(HANDLE handle) {
    584   XcvUiData* xcv_data = reinterpret_cast<XcvUiData*>(handle);
    585   delete xcv_data;
    586   return TRUE;
    587 }
    588 
    589 BOOL WINAPI MonitorUiAddPortUi(const wchar_t*,
    590                                HWND hwnd,
    591                                const wchar_t* monitor_name,
    592                                wchar_t**) {
    593   HandlePortUi(hwnd, monitor_name);
    594   return TRUE;
    595 }
    596 
    597 BOOL WINAPI MonitorUiConfigureOrDeletePortUI(const wchar_t*,
    598                                              HWND hwnd,
    599                                              const wchar_t* port_name) {
    600   HandlePortUi(hwnd, port_name);
    601   return TRUE;
    602 }
    603 
    604 }   // namespace cloud_print
    605 
    606 MONITOR2* WINAPI InitializePrintMonitor2(MONITORINIT*,
    607                                          HANDLE* handle) {
    608   if (handle == NULL) {
    609     SetLastError(ERROR_INVALID_PARAMETER);
    610     return NULL;
    611   }
    612   cloud_print::MonitorData* monitor_data = new cloud_print::MonitorData;
    613   *handle = monitor_data;
    614   if (!cloud_print::kIsUnittest) {
    615     // Unit tests set up their own AtExitManager
    616     monitor_data->at_exit_manager.reset(new base::AtExitManager());
    617     // Single spooler.exe handles verbose users.
    618     PathService::DisableCache();
    619   }
    620   return &cloud_print::g_monitor_2;
    621 }
    622 
    623 MONITORUI* WINAPI InitializePrintMonitorUI(void) {
    624   return &cloud_print::g_monitor_ui;
    625 }
    626 
    627