ppapi/proxy/plugin_dispatcher.h

   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 #ifndef PPAPI_PROXY_PLUGIN_DISPATCHER_H_
   6 #define PPAPI_PROXY_PLUGIN_DISPATCHER_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/containers/hash_tables.h"
  13 #include "base/containers/scoped_ptr_hash_map.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/process/process.h"
  17 #include "build/build_config.h"
  18 #include "ipc/ipc_sync_channel.h"
  19 #include "ppapi/c/pp_instance.h"
  20 #include "ppapi/c/pp_rect.h"
  21 #include "ppapi/c/ppb_console.h"
  22 #include "ppapi/proxy/dispatcher.h"
  23 #include "ppapi/proxy/message_handler.h"
  24 #include "ppapi/shared_impl/ppapi_preferences.h"
  25 #include "ppapi/shared_impl/ppb_view_shared.h"
  26 #include "ppapi/shared_impl/singleton_resource_id.h"
  27 #include "ppapi/shared_impl/tracked_callback.h"
  28
  29 namespace IPC {
  30 class SyncMessageFilter;
  31 }
  32
  33 namespace ppapi {
  34
  35 struct Preferences;
  36 class Resource;
  37
  38 namespace thunk {
  39 class PPB_Instance_API;
  40 class ResourceCreationAPI;
  41 }
  42
  43 namespace proxy {
  44
  45 // Used to keep track of per-instance data.
  46 struct InstanceData {
  47   InstanceData();
  48   ~InstanceData();
  49
  50   ViewData view;
  51
  52   // When non-NULL, indicates the callback to execute when mouse lock is lost.
  53   scoped_refptr<TrackedCallback> mouse_lock_callback;
  54
  55   // A map of singleton resources which are lazily created.
  56   typedef std::map<SingletonResourceID, scoped_refptr<Resource> >
  57       SingletonResourceMap;
  58   SingletonResourceMap singleton_resources;
  59
  60   // Calls to |RequestSurroundingText()| are done by posted tasks. Track whether
  61   // a) a task is pending, to avoid redundant calls, and b) whether we should
  62   // actually call |RequestSurroundingText()|, to avoid stale calls (i.e.,
  63   // calling when we shouldn't).
  64   bool is_request_surrounding_text_pending;
  65   bool should_do_request_surrounding_text;
  66
  67   // The message handler which should handle JavaScript->Plugin messages, if
  68   // one has been registered, otherwise NULL.
  69   scoped_ptr<MessageHandler> message_handler;
  70 };
  71
  72 class PPAPI_PROXY_EXPORT PluginDispatcher
  73     : public Dispatcher,
  74       public base::SupportsWeakPtr<PluginDispatcher> {
  75  public:
  76   class PPAPI_PROXY_EXPORT PluginDelegate : public ProxyChannel::Delegate {
  77    public:
  78     // Returns the set used for globally uniquifying PP_Instances. This same
  79     // set must be returned for all channels.
  80     //
  81     // DEREFERENCE ONLY ON THE I/O THREAD.
  82     virtual std::set<PP_Instance>* GetGloballySeenInstanceIDSet() = 0;
  83
  84     // Registers the plugin dispatcher and returns an ID.
  85     // Plugin dispatcher IDs will be used to dispatch messages from the browser.
  86     // Each call to Register() has to be matched with a call to Unregister().
  87     virtual uint32 Register(PluginDispatcher* plugin_dispatcher) = 0;
  88     virtual void Unregister(uint32 plugin_dispatcher_id) = 0;
  89   };
  90
  91   // Constructor for the plugin side. The init and shutdown functions will be
  92   // will be automatically called when requested by the renderer side. The
  93   // module ID will be set upon receipt of the InitializeModule message.
  94   //
  95   // Note about permissions: On the plugin side, the dispatcher and the plugin
  96   // run in the same address space (including in nacl). This means that the
  97   // permissions here are subject to malicious modification and bypass, and
  98   // an exploited or malicious plugin could send any IPC messages and just
  99   // bypass the permissions. All permissions must be checked "for realz" in the
 100   // host process when receiving messages. We check them on the plugin side
 101   // primarily to keep honest plugins honest, especially with respect to
 102   // dev interfaces that they "shouldn't" be using.
 103   //
 104   // You must call InitPluginWithChannel after the constructor.
 105   PluginDispatcher(PP_GetInterface_Func get_interface,
 106                    const PpapiPermissions& permissions,
 107                    bool incognito);
 108   virtual ~PluginDispatcher();
 109
 110   // The plugin side maintains a mapping from PP_Instance to Dispatcher so
 111   // that we can send the messages to the right channel if there are multiple
 112   // renderers sharing the same plugin. This mapping is maintained by
 113   // DidCreateInstance/DidDestroyInstance.
 114   static PluginDispatcher* GetForInstance(PP_Instance instance);
 115
 116   // Same as GetForInstance but retrieves the instance from the given resource
 117   // object as a convenience. Returns NULL on failure.
 118   static PluginDispatcher* GetForResource(const Resource* resource);
 119
 120   // Implements the GetInterface function for the plugin to call to retrieve
 121   // a browser interface.
 122   static const void* GetBrowserInterface(const char* interface_name);
 123
 124   // Logs the given log message to the given instance, or, if the instance is
 125   // invalid, to all instances associated with all dispatchers. Used for
 126   // global log messages.
 127   static void LogWithSource(PP_Instance instance,
 128                             PP_LogLevel level,
 129                             const std::string& source,
 130                             const std::string& value);
 131
 132   const void* GetPluginInterface(const std::string& interface_name);
 133
 134   // You must call this function before anything else. Returns true on success.
 135   // The delegate pointer must outlive this class, ownership is not
 136   // transferred.
 137   bool InitPluginWithChannel(PluginDelegate* delegate,
 138                              base::ProcessId peer_pid,
 139                              const IPC::ChannelHandle& channel_handle,
 140                              bool is_client);
 141
 142   // Dispatcher overrides.
 143   bool IsPlugin() const override;
 144   bool Send(IPC::Message* msg) override;
 145   // Unlike |Send()|, this function continues to hold the Pepper proxy lock
 146   // unconditionally.
 147   bool SendAndStayLocked(IPC::Message* msg) override;
 148
 149   // IPC::Listener implementation.
 150   bool OnMessageReceived(const IPC::Message& msg) override;
 151   void OnChannelError() override;
 152
 153   // Keeps track of which dispatcher to use for each instance, active instances
 154   // and tracks associated data like the current size.
 155   void DidCreateInstance(PP_Instance instance);
 156   void DidDestroyInstance(PP_Instance instance);
 157
 158   // Gets the data for an existing instance, or NULL if the instance id doesn't
 159   // correspond to a known instance.
 160   InstanceData* GetInstanceData(PP_Instance instance);
 161
 162   // Returns the corresponding API. These are APIs not associated with a
 163   // resource. Guaranteed non-NULL.
 164   thunk::PPB_Instance_API* GetInstanceAPI();
 165   thunk::ResourceCreationAPI* GetResourceCreationAPI();
 166
 167   // Returns the Preferences.
 168   const Preferences& preferences() const { return preferences_; }
 169
 170   uint32 plugin_dispatcher_id() const { return plugin_dispatcher_id_; }
 171   bool incognito() const { return incognito_; }
 172
 173  private:
 174   friend class PluginDispatcherTest;
 175
 176   // Notifies all live instances that they're now closed. This is used when
 177   // a renderer crashes or some other error is received.
 178   void ForceFreeAllInstances();
 179
 180   // IPC message handlers.
 181   void OnMsgSupportsInterface(const std::string& interface_name, bool* result);
 182   void OnMsgSetPreferences(const Preferences& prefs);
 183
 184   virtual bool SendMessage(IPC::Message* msg);
 185
 186   PluginDelegate* plugin_delegate_;
 187
 188   // Contains all the plugin interfaces we've queried. The mapped value will
 189   // be the pointer to the interface pointer supplied by the plugin if it's
 190   // supported, or NULL if it's not supported. This allows us to cache failures
 191   // and not req-query if a plugin doesn't support the interface.
 192   typedef base::hash_map<std::string, const void*> InterfaceMap;
 193   InterfaceMap plugin_interfaces_;
 194
 195   typedef base::ScopedPtrHashMap<PP_Instance, InstanceData> InstanceDataMap;
 196   InstanceDataMap instance_map_;
 197
 198   // The preferences sent from the host. We only want to set this once, which
 199   // is what the received_preferences_ indicates. See OnMsgSetPreferences.
 200   bool received_preferences_;
 201   Preferences preferences_;
 202
 203   uint32 plugin_dispatcher_id_;
 204
 205   // Set to true when the instances associated with this dispatcher are
 206   // incognito mode.
 207   bool incognito_;
 208
 209   // A filter for sending messages from threads other than the main thread.
 210   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 211
 212   DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
 213 };
 214
 215 }  // namespace proxy
 216 }  // namespace ppapi
 217
 218 #endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_