content/browser/plugin_loader_posix.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/plugin_loader_posix.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "base/message_loop/message_loop_proxy.h"
  10 #include "base/metrics/histogram.h"
  11 #include "content/browser/utility_process_host_impl.h"
  12 #include "content/common/child_process_host_impl.h"
  13 #include "content/common/plugin_list.h"
  14 #include "content/common/utility_messages.h"
  15 #include "content/public/browser/browser_thread.h"
  16 #include "content/public/browser/plugin_service.h"
  17 #include "content/public/browser/user_metrics.h"
  18
  19 namespace content {
  20
  21 PluginLoaderPosix::PluginLoaderPosix()
  22     : next_load_index_(0), loading_plugins_(false) {
  23 }
  24
  25 void PluginLoaderPosix::GetPlugins(
  26     const PluginService::GetPluginsCallback& callback) {
  27   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  28
  29   std::vector<WebPluginInfo> cached_plugins;
  30   if (PluginList::Singleton()->GetPluginsNoRefresh(&cached_plugins)) {
  31     // Can't assume the caller is reentrant.
  32     base::MessageLoop::current()->PostTask(FROM_HERE,
  33         base::Bind(callback, cached_plugins));
  34     return;
  35   }
  36
  37   if (!loading_plugins_) {
  38     loading_plugins_ = true;
  39     callbacks_.push_back(callback);
  40
  41     // When |loading_plugins_| is set to false, this instance must call
  42     // SetPlugins().
  43     PluginList::Singleton()->PrepareForPluginLoading();
  44
  45     BrowserThread::PostTask(BrowserThread::FILE,
  46                             FROM_HERE,
  47                             base::Bind(&PluginLoaderPosix::GetPluginsToLoad,
  48                                        make_scoped_refptr(this)));
  49   } else {
  50     // If we are currently loading plugins, the plugin list might have been
  51     // invalidated in the mean time, or might get invalidated before we finish.
  52     // We'll wait until we have finished the current run, then try to get them
  53     // again from the plugin list. If it has indeed been invalidated, it will
  54     // restart plugin loading, otherwise it will immediately run the callback.
  55     callbacks_.push_back(base::Bind(&PluginLoaderPosix::GetPluginsWrapper,
  56                                     make_scoped_refptr(this), callback));
  57   }
  58 }
  59
  60 bool PluginLoaderPosix::OnMessageReceived(const IPC::Message& message) {
  61   bool handled = true;
  62   IPC_BEGIN_MESSAGE_MAP(PluginLoaderPosix, message)
  63     IPC_MESSAGE_HANDLER(UtilityHostMsg_LoadedPlugin, OnPluginLoaded)
  64     IPC_MESSAGE_HANDLER(UtilityHostMsg_LoadPluginFailed, OnPluginLoadFailed)
  65     IPC_MESSAGE_UNHANDLED(handled = false)
  66   IPC_END_MESSAGE_MAP()
  67   return handled;
  68 }
  69
  70 void PluginLoaderPosix::OnProcessCrashed(int exit_code) {
  71   RecordAction(
  72       base::UserMetricsAction("PluginLoaderPosix.UtilityProcessCrashed"));
  73
  74   if (next_load_index_ == canonical_list_.size()) {
  75     // How this case occurs is unknown. See crbug.com/111935.
  76     canonical_list_.clear();
  77   } else {
  78     canonical_list_.erase(canonical_list_.begin(),
  79                           canonical_list_.begin() + next_load_index_ + 1);
  80   }
  81
  82   next_load_index_ = 0;
  83
  84   LoadPluginsInternal();
  85 }
  86
  87 void PluginLoaderPosix::OnProcessLaunchFailed() {
  88   FinishedLoadingPlugins();
  89 }
  90
  91 bool PluginLoaderPosix::Send(IPC::Message* message) {
  92   if (process_host_.get())
  93     return process_host_->Send(message);
  94   return false;
  95 }
  96
  97 PluginLoaderPosix::~PluginLoaderPosix() {
  98 }
  99
 100 void PluginLoaderPosix::GetPluginsToLoad() {
 101   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 102
 103   base::TimeTicks start_time(base::TimeTicks::Now());
 104
 105   loaded_plugins_.clear();
 106   next_load_index_ = 0;
 107
 108   canonical_list_.clear();
 109   PluginList::Singleton()->GetPluginPathsToLoad(
 110       &canonical_list_,
 111       PluginService::GetInstance()->NPAPIPluginsSupported());
 112
 113   internal_plugins_.clear();
 114   PluginList::Singleton()->GetInternalPlugins(&internal_plugins_);
 115
 116   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
 117       base::Bind(&PluginLoaderPosix::LoadPluginsInternal,
 118                  make_scoped_refptr(this)));
 119
 120   LOCAL_HISTOGRAM_TIMES("PluginLoaderPosix.GetPluginList",
 121                         (base::TimeTicks::Now() - start_time) *
 122                             base::Time::kMicrosecondsPerMillisecond);
 123 }
 124
 125 void PluginLoaderPosix::LoadPluginsInternal() {
 126   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 127
 128   // Check if the list is empty or all plugins have already been loaded before
 129   // forking.
 130   if (IsFinishedLoadingPlugins()) {
 131     FinishedLoadingPlugins();
 132     return;
 133   }
 134
 135   RecordAction(
 136       base::UserMetricsAction("PluginLoaderPosix.LaunchUtilityProcess"));
 137
 138   UtilityProcessHostImpl* host = new UtilityProcessHostImpl(
 139       this,
 140       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get());
 141   process_host_ = host->AsWeakPtr();
 142   process_host_->DisableSandbox();
 143 #if defined(OS_MACOSX)
 144   host->set_child_flags(ChildProcessHost::CHILD_ALLOW_HEAP_EXECUTION);
 145 #endif
 146
 147   bool launched = LaunchUtilityProcess();
 148   if (!launched) {
 149     // The utility process either failed to start or failed to receive the IPC.
 150     // This process will never receive any callbacks for OnPluginLoaded() or
 151     // OnPluginLoadFailed().
 152     FinishedLoadingPlugins();
 153   }
 154 }
 155
 156 void PluginLoaderPosix::GetPluginsWrapper(
 157     const PluginService::GetPluginsCallback& callback,
 158     const std::vector<WebPluginInfo>& plugins_unused) {
 159   // We are being called after plugin loading has finished, but we don't know
 160   // whether the plugin list has been invalidated in the mean time
 161   // (and therefore |plugins| might already be stale). So we simply ignore it
 162   // and call regular GetPlugins() instead.
 163   GetPlugins(callback);
 164 }
 165
 166 void PluginLoaderPosix::OnPluginLoaded(uint32 index,
 167                                        const WebPluginInfo& plugin) {
 168   if (index != next_load_index_) {
 169     LOG(ERROR) << "Received unexpected plugin load message for "
 170                << plugin.path.value() << "; index=" << index;
 171     return;
 172   }
 173
 174   auto it = FindInternalPlugin(plugin.path);
 175   if (it != internal_plugins_.end()) {
 176     loaded_plugins_.push_back(*it);
 177     internal_plugins_.erase(it);
 178   } else {
 179     loaded_plugins_.push_back(plugin);
 180   }
 181
 182   ++next_load_index_;
 183
 184   if (IsFinishedLoadingPlugins())
 185     FinishedLoadingPlugins();
 186 }
 187
 188 void PluginLoaderPosix::OnPluginLoadFailed(uint32 index,
 189                                            const base::FilePath& plugin_path) {
 190   if (index != next_load_index_) {
 191     LOG(ERROR) << "Received unexpected plugin load failure message for "
 192                << plugin_path.value() << "; index=" << index;
 193     return;
 194   }
 195
 196   ++next_load_index_;
 197
 198   auto it = FindInternalPlugin(plugin_path);
 199   if (it != internal_plugins_.end()) {
 200     loaded_plugins_.push_back(*it);
 201     internal_plugins_.erase(it);
 202   }
 203
 204   if (IsFinishedLoadingPlugins())
 205     FinishedLoadingPlugins();
 206 }
 207
 208 std::vector<WebPluginInfo>::iterator PluginLoaderPosix::FindInternalPlugin(
 209     const base::FilePath& plugin_path) {
 210   return std::find_if(internal_plugins_.begin(), internal_plugins_.end(),
 211                       [&plugin_path](const WebPluginInfo& plugin) {
 212     return plugin.path == plugin_path;
 213   });
 214 }
 215
 216 bool PluginLoaderPosix::IsFinishedLoadingPlugins() {
 217   if (canonical_list_.empty())
 218     return true;
 219
 220   DCHECK(next_load_index_ <= canonical_list_.size());
 221   return next_load_index_ == canonical_list_.size();
 222 }
 223
 224 void PluginLoaderPosix::FinishedLoadingPlugins() {
 225   loading_plugins_ = false;
 226   PluginList::Singleton()->SetPlugins(loaded_plugins_);
 227
 228   for (auto& callback : callbacks_) {
 229     base::MessageLoop::current()->PostTask(
 230         FROM_HERE, base::Bind(callback, loaded_plugins_));
 231   }
 232   callbacks_.clear();
 233 }
 234
 235 bool PluginLoaderPosix::LaunchUtilityProcess() {
 236   return process_host_->Send(new UtilityMsg_LoadPlugins(canonical_list_));
 237 }
 238
 239 }  // namespace content