src/chrome/service/service_utility_process_host.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/service/service_utility_process_host.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/file_util.h"
  10 #include "base/files/scoped_temp_dir.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/message_loop/message_loop_proxy.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/process/kill.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "chrome/common/chrome_switches.h"
  18 #include "chrome/common/chrome_utility_messages.h"
  19 #include "content/public/common/child_process_host.h"
  20 #include "content/public/common/result_codes.h"
  21 #include "content/public/common/sandbox_init.h"
  22 #include "ipc/ipc_switches.h"
  23 #include "printing/page_range.h"
  24 #include "ui/base/ui_base_switches.h"
  25 #include "ui/gfx/rect.h"
  26
  27 #if defined(OS_WIN)
  28 #include "base/files/file_path.h"
  29 #include "base/memory/scoped_ptr.h"
  30 #include "base/process/launch.h"
  31 #include "base/win/scoped_handle.h"
  32 #include "content/public/common/sandbox_init.h"
  33 #include "content/public/common/sandboxed_process_launcher_delegate.h"
  34 #include "printing/emf_win.h"
  35
  36 namespace {
  37
  38 // NOTE: changes to this class need to be reviewed by the security team.
  39 class ServiceSandboxedProcessLauncherDelegate
  40     : public content::SandboxedProcessLauncherDelegate {
  41  public:
  42   explicit ServiceSandboxedProcessLauncherDelegate(
  43       const base::FilePath& exposed_dir)
  44     : exposed_dir_(exposed_dir) {
  45   }
  46
  47   virtual void PreSandbox(bool* disable_default_policy,
  48                           base::FilePath* exposed_dir) OVERRIDE {
  49     *exposed_dir = exposed_dir_;
  50   }
  51
  52  private:
  53   base::FilePath exposed_dir_;
  54 };
  55
  56 }  // namespace
  57
  58 #endif  // OS_WIN
  59
  60 using content::ChildProcessHost;
  61
  62 namespace {
  63   enum ServiceUtilityProcessHostEvent {
  64   SERVICE_UTILITY_STARTED,
  65   SERVICE_UTILITY_DISCONNECTED,
  66   SERVICE_UTILITY_METAFILE_REQUEST,
  67   SERVICE_UTILITY_METAFILE_SUCCEEDED,
  68   SERVICE_UTILITY_METAFILE_FAILED,
  69   SERVICE_UTILITY_CAPS_REQUEST,
  70   SERVICE_UTILITY_CAPS_SUCCEEDED,
  71   SERVICE_UTILITY_CAPS_FAILED,
  72   SERVICE_UTILITY_EVENT_MAX,
  73 };
  74 }  // namespace
  75
  76 ServiceUtilityProcessHost::ServiceUtilityProcessHost(
  77     Client* client, base::MessageLoopProxy* client_message_loop_proxy)
  78         : handle_(base::kNullProcessHandle),
  79           client_(client),
  80           client_message_loop_proxy_(client_message_loop_proxy),
  81           waiting_for_reply_(false) {
  82   child_process_host_.reset(ChildProcessHost::Create(this));
  83 }
  84
  85 ServiceUtilityProcessHost::~ServiceUtilityProcessHost() {
  86   // We need to kill the child process when the host dies.
  87   base::KillProcess(handle_, content::RESULT_CODE_NORMAL_EXIT, false);
  88 }
  89
  90 bool ServiceUtilityProcessHost::StartRenderPDFPagesToMetafile(
  91     const base::FilePath& pdf_path,
  92     const printing::PdfRenderSettings& render_settings,
  93     const std::vector<printing::PageRange>& page_ranges) {
  94   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
  95                             SERVICE_UTILITY_METAFILE_REQUEST,
  96                             SERVICE_UTILITY_EVENT_MAX);
  97   start_time_ = base::Time::Now();
  98 #if !defined(OS_WIN)
  99   // This is only implemented on Windows (because currently it is only needed
 100   // on Windows). Will add implementations on other platforms when needed.
 101   NOTIMPLEMENTED();
 102   return false;
 103 #else  // !defined(OS_WIN)
 104   scratch_metafile_dir_.reset(new base::ScopedTempDir);
 105   if (!scratch_metafile_dir_->CreateUniqueTempDir())
 106     return false;
 107   if (!file_util::CreateTemporaryFileInDir(scratch_metafile_dir_->path(),
 108                                            &metafile_path_)) {
 109     return false;
 110   }
 111
 112   if (!StartProcess(false, scratch_metafile_dir_->path()))
 113     return false;
 114
 115   base::win::ScopedHandle pdf_file(
 116       ::CreateFile(pdf_path.value().c_str(),
 117                    GENERIC_READ,
 118                    FILE_SHARE_READ | FILE_SHARE_WRITE,
 119                    NULL,
 120                    OPEN_EXISTING,
 121                    FILE_ATTRIBUTE_NORMAL,
 122                    NULL));
 123   if (pdf_file == INVALID_HANDLE_VALUE)
 124     return false;
 125   HANDLE pdf_file_in_utility_process = NULL;
 126   ::DuplicateHandle(::GetCurrentProcess(), pdf_file, handle(),
 127                     &pdf_file_in_utility_process, 0, false,
 128                     DUPLICATE_SAME_ACCESS);
 129   if (!pdf_file_in_utility_process)
 130     return false;
 131   waiting_for_reply_ = true;
 132   return child_process_host_->Send(
 133       new ChromeUtilityMsg_RenderPDFPagesToMetafile(
 134           pdf_file_in_utility_process,
 135           metafile_path_,
 136           render_settings,
 137           page_ranges));
 138 #endif  // !defined(OS_WIN)
 139 }
 140
 141 bool ServiceUtilityProcessHost::StartGetPrinterCapsAndDefaults(
 142     const std::string& printer_name) {
 143   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 144                             SERVICE_UTILITY_CAPS_REQUEST,
 145                             SERVICE_UTILITY_EVENT_MAX);
 146   start_time_ = base::Time::Now();
 147   base::FilePath exposed_path;
 148   if (!StartProcess(true, exposed_path))
 149     return false;
 150   waiting_for_reply_ = true;
 151   return child_process_host_->Send(
 152       new ChromeUtilityMsg_GetPrinterCapsAndDefaults(printer_name));
 153 }
 154
 155 bool ServiceUtilityProcessHost::StartProcess(
 156     bool no_sandbox,
 157     const base::FilePath& exposed_dir) {
 158   std::string channel_id = child_process_host_->CreateChannel();
 159   if (channel_id.empty())
 160     return false;
 161
 162   base::FilePath exe_path = GetUtilityProcessCmd();
 163   if (exe_path.empty()) {
 164     NOTREACHED() << "Unable to get utility process binary name.";
 165     return false;
 166   }
 167
 168   CommandLine cmd_line(exe_path);
 169   cmd_line.AppendSwitchASCII(switches::kProcessType, switches::kUtilityProcess);
 170   cmd_line.AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 171   cmd_line.AppendSwitch(switches::kLang);
 172
 173   if (Launch(&cmd_line, no_sandbox, exposed_dir)) {
 174     UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 175                               SERVICE_UTILITY_STARTED,
 176                               SERVICE_UTILITY_EVENT_MAX);
 177     return true;
 178   }
 179   return false;
 180 }
 181
 182 bool ServiceUtilityProcessHost::Launch(CommandLine* cmd_line,
 183                                        bool no_sandbox,
 184                                        const base::FilePath& exposed_dir) {
 185 #if !defined(OS_WIN)
 186   // TODO(sanjeevr): Implement for non-Windows OSes.
 187   NOTIMPLEMENTED();
 188   return false;
 189 #else  // !defined(OS_WIN)
 190
 191   if (no_sandbox) {
 192     base::ProcessHandle process = base::kNullProcessHandle;
 193     cmd_line->AppendSwitch(switches::kNoSandbox);
 194     base::LaunchProcess(*cmd_line, base::LaunchOptions(), &handle_);
 195   } else {
 196     ServiceSandboxedProcessLauncherDelegate delegate(exposed_dir);
 197     handle_ = content::StartSandboxedProcess(&delegate, cmd_line);
 198   }
 199   return (handle_ != base::kNullProcessHandle);
 200 #endif  // !defined(OS_WIN)
 201 }
 202
 203 base::FilePath ServiceUtilityProcessHost::GetUtilityProcessCmd() {
 204 #if defined(OS_LINUX)
 205   int flags = ChildProcessHost::CHILD_ALLOW_SELF;
 206 #else
 207   int flags = ChildProcessHost::CHILD_NORMAL;
 208 #endif
 209   return ChildProcessHost::GetChildPath(flags);
 210 }
 211
 212 void ServiceUtilityProcessHost::OnChildDisconnected() {
 213   if (waiting_for_reply_) {
 214     // If we are yet to receive a reply then notify the client that the
 215     // child died.
 216     client_message_loop_proxy_->PostTask(
 217         FROM_HERE, base::Bind(&Client::OnChildDied, client_.get()));
 218     UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 219                               SERVICE_UTILITY_DISCONNECTED,
 220                               SERVICE_UTILITY_EVENT_MAX);
 221     UMA_HISTOGRAM_TIMES("CloudPrint.ServiceUtilityDisconnectTime",
 222                         base::Time::Now() - start_time_);
 223   }
 224   delete this;
 225 }
 226
 227 bool ServiceUtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
 228   bool handled = true;
 229   IPC_BEGIN_MESSAGE_MAP(ServiceUtilityProcessHost, message)
 230     IPC_MESSAGE_HANDLER(
 231         ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Succeeded,
 232         OnRenderPDFPagesToMetafileSucceeded)
 233     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Failed,
 234                         OnRenderPDFPagesToMetafileFailed)
 235     IPC_MESSAGE_HANDLER(
 236         ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Succeeded,
 237         OnGetPrinterCapsAndDefaultsSucceeded)
 238     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Failed,
 239                         OnGetPrinterCapsAndDefaultsFailed)
 240     IPC_MESSAGE_UNHANDLED(handled = false)
 241   IPC_END_MESSAGE_MAP()
 242   return handled;
 243 }
 244
 245 void ServiceUtilityProcessHost::OnRenderPDFPagesToMetafileSucceeded(
 246     int highest_rendered_page_number,
 247     double scale_factor) {
 248   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 249                             SERVICE_UTILITY_METAFILE_SUCCEEDED,
 250                             SERVICE_UTILITY_EVENT_MAX);
 251   UMA_HISTOGRAM_TIMES("CloudPrint.ServiceUtilityMetafileTime",
 252                       base::Time::Now() - start_time_);
 253   DCHECK(waiting_for_reply_);
 254   waiting_for_reply_ = false;
 255   // If the metafile was successfully created, we need to take our hands off the
 256   // scratch metafile directory. The client will delete it when it is done with
 257   // metafile.
 258   scratch_metafile_dir_->Take();
 259   client_message_loop_proxy_->PostTask(
 260       FROM_HERE,
 261       base::Bind(&Client::MetafileAvailable, client_.get(), metafile_path_,
 262                  highest_rendered_page_number, scale_factor));
 263 }
 264
 265 void ServiceUtilityProcessHost::OnRenderPDFPagesToMetafileFailed() {
 266   DCHECK(waiting_for_reply_);
 267   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 268                             SERVICE_UTILITY_METAFILE_FAILED,
 269                             SERVICE_UTILITY_EVENT_MAX);
 270   UMA_HISTOGRAM_TIMES("CloudPrint.ServiceUtilityMetafileFailTime",
 271                       base::Time::Now() - start_time_);
 272   waiting_for_reply_ = false;
 273   client_message_loop_proxy_->PostTask(
 274       FROM_HERE,
 275       base::Bind(&Client::OnRenderPDFPagesToMetafileFailed, client_.get()));
 276 }
 277
 278 void ServiceUtilityProcessHost::OnGetPrinterCapsAndDefaultsSucceeded(
 279     const std::string& printer_name,
 280     const printing::PrinterCapsAndDefaults& caps_and_defaults) {
 281   DCHECK(waiting_for_reply_);
 282   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 283                             SERVICE_UTILITY_CAPS_SUCCEEDED,
 284                             SERVICE_UTILITY_EVENT_MAX);
 285   UMA_HISTOGRAM_TIMES("CloudPrint.ServiceUtilityCapsTime",
 286                       base::Time::Now() - start_time_);
 287   waiting_for_reply_ = false;
 288   client_message_loop_proxy_->PostTask(
 289       FROM_HERE,
 290       base::Bind(&Client::OnGetPrinterCapsAndDefaultsSucceeded, client_.get(),
 291                  printer_name, caps_and_defaults));
 292 }
 293
 294 void ServiceUtilityProcessHost::OnGetPrinterCapsAndDefaultsFailed(
 295     const std::string& printer_name) {
 296   DCHECK(waiting_for_reply_);
 297   UMA_HISTOGRAM_ENUMERATION("CloudPrint.ServiceUtilityProcessHostEvent",
 298                             SERVICE_UTILITY_CAPS_FAILED,
 299                             SERVICE_UTILITY_EVENT_MAX);
 300   UMA_HISTOGRAM_TIMES("CloudPrint.ServiceUtilityCapsFailTime",
 301                       base::Time::Now() - start_time_);
 302   waiting_for_reply_ = false;
 303   client_message_loop_proxy_->PostTask(
 304       FROM_HERE,
 305       base::Bind(&Client::OnGetPrinterCapsAndDefaultsFailed, client_.get(),
 306                  printer_name));
 307 }
 308
 309 void ServiceUtilityProcessHost::Client::MetafileAvailable(
 310     const base::FilePath& metafile_path,
 311     int highest_rendered_page_number,
 312     double scale_factor) {
 313   // The metafile was created in a temp folder which needs to get deleted after
 314   // we have processed it.
 315   base::ScopedTempDir scratch_metafile_dir;
 316   if (!scratch_metafile_dir.Set(metafile_path.DirName()))
 317     LOG(WARNING) << "Unable to set scratch metafile directory";
 318 #if defined(OS_WIN)
 319   // It's important that metafile is declared after scratch_metafile_dir so
 320   // that the metafile destructor closes the file before the base::ScopedTempDir
 321   // destructor tries to remove the directory.
 322   printing::Emf metafile;
 323   if (!metafile.InitFromFile(metafile_path)) {
 324     OnRenderPDFPagesToMetafileFailed();
 325   } else {
 326     OnRenderPDFPagesToMetafileSucceeded(metafile,
 327                                         highest_rendered_page_number,
 328                                         scale_factor);
 329   }
 330 #endif  // defined(OS_WIN)
 331 }
 332