content/browser/utility_process_host_impl.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 "content/browser/utility_process_host_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/command_line.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/run_loop.h"
  13 #include "base/sequenced_task_runner.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "base/synchronization/lock.h"
  16 #include "base/synchronization/waitable_event.h"
  17 #include "content/browser/browser_child_process_host_impl.h"
  18 #include "content/browser/renderer_host/render_process_host_impl.h"
  19 #include "content/common/child_process_host_impl.h"
  20 #include "content/common/utility_messages.h"
  21 #include "content/public/browser/browser_thread.h"
  22 #include "content/public/browser/content_browser_client.h"
  23 #include "content/public/browser/utility_process_host_client.h"
  24 #include "content/public/common/content_switches.h"
  25 #include "content/public/common/process_type.h"
  26 #include "ipc/ipc_switches.h"
  27 #include "ui/base/ui_base_switches.h"
  28
  29 #if defined(OS_WIN)
  30 #include "content/public/common/sandboxed_process_launcher_delegate.h"
  31 #endif
  32
  33 namespace content {
  34
  35 #if defined(OS_WIN)
  36 // NOTE: changes to this class need to be reviewed by the security team.
  37 class UtilitySandboxedProcessLauncherDelegate
  38     : public SandboxedProcessLauncherDelegate {
  39  public:
  40   explicit UtilitySandboxedProcessLauncherDelegate(
  41     const base::FilePath& exposed_dir) : exposed_dir_(exposed_dir) {}
  42   virtual ~UtilitySandboxedProcessLauncherDelegate() {}
  43
  44   virtual void PreSandbox(bool* disable_default_policy,
  45                           base::FilePath* exposed_dir) OVERRIDE {
  46     *exposed_dir = exposed_dir_;
  47   }
  48
  49 private:
  50   base::FilePath exposed_dir_;
  51 };
  52 #endif
  53
  54
  55 UtilityMainThreadFactoryFunction g_utility_main_thread_factory = NULL;
  56
  57 UtilityProcessHost* UtilityProcessHost::Create(
  58     UtilityProcessHostClient* client,
  59     base::SequencedTaskRunner* client_task_runner) {
  60   return new UtilityProcessHostImpl(client, client_task_runner);
  61 }
  62
  63 void UtilityProcessHost::RegisterUtilityMainThreadFactory(
  64     UtilityMainThreadFactoryFunction create) {
  65   g_utility_main_thread_factory = create;
  66 }
  67
  68 UtilityProcessHostImpl::UtilityProcessHostImpl(
  69     UtilityProcessHostClient* client,
  70     base::SequencedTaskRunner* client_task_runner)
  71     : client_(client),
  72       client_task_runner_(client_task_runner),
  73       is_batch_mode_(false),
  74       is_mdns_enabled_(false),
  75       no_sandbox_(false),
  76 #if defined(OS_LINUX)
  77       child_flags_(ChildProcessHost::CHILD_ALLOW_SELF),
  78 #else
  79       child_flags_(ChildProcessHost::CHILD_NORMAL),
  80 #endif
  81       use_linux_zygote_(false),
  82       started_(false) {
  83 }
  84
  85 UtilityProcessHostImpl::~UtilityProcessHostImpl() {
  86   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  87   if (is_batch_mode_)
  88     EndBatchMode();
  89 }
  90
  91 bool UtilityProcessHostImpl::Send(IPC::Message* message) {
  92   if (!StartProcess())
  93     return false;
  94
  95   return process_->Send(message);
  96 }
  97
  98 bool UtilityProcessHostImpl::StartBatchMode()  {
  99   CHECK(!is_batch_mode_);
 100   is_batch_mode_ = StartProcess();
 101   Send(new UtilityMsg_BatchMode_Started());
 102   return is_batch_mode_;
 103 }
 104
 105 void UtilityProcessHostImpl::EndBatchMode()  {
 106   CHECK(is_batch_mode_);
 107   is_batch_mode_ = false;
 108   Send(new UtilityMsg_BatchMode_Finished());
 109 }
 110
 111 void UtilityProcessHostImpl::SetExposedDir(const base::FilePath& dir) {
 112   exposed_dir_ = dir;
 113 }
 114
 115 void UtilityProcessHostImpl::EnableMDns() {
 116   is_mdns_enabled_ = true;
 117 }
 118
 119 void UtilityProcessHostImpl::DisableSandbox() {
 120   no_sandbox_ = true;
 121 }
 122
 123 void UtilityProcessHostImpl::EnableZygote() {
 124   use_linux_zygote_ = true;
 125 }
 126
 127 const ChildProcessData& UtilityProcessHostImpl::GetData() {
 128   return process_->GetData();
 129 }
 130
 131 #if defined(OS_POSIX)
 132
 133 void UtilityProcessHostImpl::SetEnv(const base::EnvironmentMap& env) {
 134   env_ = env;
 135 }
 136
 137 #endif  // OS_POSIX
 138
 139 bool UtilityProcessHostImpl::StartProcess() {
 140   if (started_)
 141     return true;
 142   started_ = true;
 143
 144   if (is_batch_mode_)
 145     return true;
 146
 147   // Name must be set or metrics_service will crash in any test which
 148   // launches a UtilityProcessHost.
 149   process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_UTILITY, this));
 150   process_->SetName(ASCIIToUTF16("utility process"));
 151
 152   std::string channel_id = process_->GetHost()->CreateChannel();
 153   if (channel_id.empty())
 154     return false;
 155
 156   // Single process not supported in multiple dll mode currently.
 157   if (RenderProcessHost::run_renderer_in_process() &&
 158       g_utility_main_thread_factory) {
 159     // See comment in RenderProcessHostImpl::Init() for the background on why we
 160     // support single process mode this way.
 161     in_process_thread_.reset(g_utility_main_thread_factory(channel_id));
 162     in_process_thread_->Start();
 163   } else {
 164     const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
 165     int child_flags = child_flags_;
 166
 167 #if defined(OS_POSIX)
 168     bool has_cmd_prefix = browser_command_line.HasSwitch(
 169         switches::kUtilityCmdPrefix);
 170
 171     // When running under gdb, forking /proc/self/exe ends up forking the gdb
 172     // executable instead of Chromium. It is almost safe to assume that no
 173     // updates will happen while a developer is running with
 174     // |switches::kUtilityCmdPrefix|. See ChildProcessHost::GetChildPath() for
 175     // a similar case with Valgrind.
 176     if (has_cmd_prefix)
 177       child_flags = ChildProcessHost::CHILD_NORMAL;
 178 #endif
 179
 180     base::FilePath exe_path = ChildProcessHost::GetChildPath(child_flags);
 181     if (exe_path.empty()) {
 182       NOTREACHED() << "Unable to get utility process binary name.";
 183       return false;
 184     }
 185
 186     CommandLine* cmd_line = new CommandLine(exe_path);
 187     cmd_line->AppendSwitchASCII(switches::kProcessType,
 188                                 switches::kUtilityProcess);
 189     cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 190     std::string locale = GetContentClient()->browser()->GetApplicationLocale();
 191     cmd_line->AppendSwitchASCII(switches::kLang, locale);
 192
 193     if (no_sandbox_ || browser_command_line.HasSwitch(switches::kNoSandbox))
 194       cmd_line->AppendSwitch(switches::kNoSandbox);
 195 #if defined(OS_MACOSX)
 196     if (browser_command_line.HasSwitch(switches::kEnableSandboxLogging))
 197       cmd_line->AppendSwitch(switches::kEnableSandboxLogging);
 198 #endif
 199     if (browser_command_line.HasSwitch(switches::kDebugPluginLoading))
 200       cmd_line->AppendSwitch(switches::kDebugPluginLoading);
 201
 202 #if defined(OS_POSIX)
 203     // TODO(port): Sandbox this on Linux.  Also, zygote this to work with
 204     // Linux updating.
 205     if (has_cmd_prefix) {
 206       // launch the utility child process with some prefix
 207       // (usually "xterm -e gdb --args").
 208       cmd_line->PrependWrapper(browser_command_line.GetSwitchValueNative(
 209           switches::kUtilityCmdPrefix));
 210     }
 211
 212     cmd_line->AppendSwitchPath(switches::kUtilityProcessAllowedDir,
 213                                exposed_dir_);
 214 #endif
 215
 216     if (is_mdns_enabled_)
 217       cmd_line->AppendSwitch(switches::kUtilityProcessEnableMDns);
 218
 219     bool use_zygote = false;
 220
 221 #if defined(OS_LINUX)
 222     use_zygote = !no_sandbox_ && use_linux_zygote_;
 223 #endif
 224
 225     process_->Launch(
 226 #if defined(OS_WIN)
 227         new UtilitySandboxedProcessLauncherDelegate(exposed_dir_),
 228 #elif defined(OS_POSIX)
 229         use_zygote,
 230         env_,
 231 #endif
 232         cmd_line);
 233   }
 234
 235   return true;
 236 }
 237
 238 bool UtilityProcessHostImpl::OnMessageReceived(const IPC::Message& message) {
 239   client_task_runner_->PostTask(
 240       FROM_HERE,
 241       base::Bind(base::IgnoreResult(
 242           &UtilityProcessHostClient::OnMessageReceived), client_.get(),
 243           message));
 244   return true;
 245 }
 246
 247 void UtilityProcessHostImpl::OnProcessCrashed(int exit_code) {
 248   client_task_runner_->PostTask(
 249       FROM_HERE,
 250       base::Bind(&UtilityProcessHostClient::OnProcessCrashed, client_.get(),
 251             exit_code));
 252 }
 253
 254 }  // namespace content