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/memory/ref_counted.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/process/process.h"
  16 #include "build/build_config.h"
  17 #include "ipc/ipc_sync_channel.h"
  18 #include "ppapi/c/pp_instance.h"
  19 #include "ppapi/c/pp_rect.h"
  20 #include "ppapi/c/ppb_console.h"
  21 #include "ppapi/proxy/dispatcher.h"
  22 #include "ppapi/shared_impl/ppapi_preferences.h"
  23 #include "ppapi/shared_impl/ppb_view_shared.h"
  24 #include "ppapi/shared_impl/singleton_resource_id.h"
  25 #include "ppapi/shared_impl/tracked_callback.h"
  26
  27 namespace IPC {
  28 class SyncMessageFilter;
  29 }
  30
  31 namespace ppapi {
  32
  33 struct Preferences;
  34 class Resource;
  35
  36 namespace thunk {
  37 class PPB_Instance_API;
  38 class ResourceCreationAPI;
  39 }
  40
  41 namespace proxy {
  42
  43 class ResourceMessageReplyParams;
  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
  68 class PPAPI_PROXY_EXPORT PluginDispatcher
  69     : public Dispatcher,
  70       public base::SupportsWeakPtr<PluginDispatcher> {
  71  public:
  72   class PPAPI_PROXY_EXPORT PluginDelegate : public ProxyChannel::Delegate {
  73    public:
  74     // Returns the set used for globally uniquifying PP_Instances. This same
  75     // set must be returned for all channels.
  76     //
  77     // DEREFERENCE ONLY ON THE I/O THREAD.
  78     virtual std::set<PP_Instance>* GetGloballySeenInstanceIDSet() = 0;
  79
  80     // Registers the plugin dispatcher and returns an ID.
  81     // Plugin dispatcher IDs will be used to dispatch messages from the browser.
  82     // Each call to Register() has to be matched with a call to Unregister().
  83     virtual uint32 Register(PluginDispatcher* plugin_dispatcher) = 0;
  84     virtual void Unregister(uint32 plugin_dispatcher_id) = 0;
  85   };
  86
  87   // Constructor for the plugin side. The init and shutdown functions will be
  88   // will be automatically called when requested by the renderer side. The
  89   // module ID will be set upon receipt of the InitializeModule message.
  90   //
  91   // Note about permissions: On the plugin side, the dispatcher and the plugin
  92   // run in the same address space (including in nacl). This means that the
  93   // permissions here are subject to malicious modification and bypass, and
  94   // an exploited or malicious plugin could send any IPC messages and just
  95   // bypass the permissions. All permissions must be checked "for realz" in the
  96   // host process when receiving messages. We check them on the plugin side
  97   // primarily to keep honest plugins honest, especially with respect to
  98   // dev interfaces that they "shouldn't" be using.
  99   //
 100   // You must call InitPluginWithChannel after the constructor.
 101   PluginDispatcher(PP_GetInterface_Func get_interface,
 102                    const PpapiPermissions& permissions,
 103                    bool incognito);
 104   virtual ~PluginDispatcher();
 105
 106   // The plugin side maintains a mapping from PP_Instance to Dispatcher so
 107   // that we can send the messages to the right channel if there are multiple
 108   // renderers sharing the same plugin. This mapping is maintained by
 109   // DidCreateInstance/DidDestroyInstance.
 110   static PluginDispatcher* GetForInstance(PP_Instance instance);
 111
 112   // Same as GetForInstance but retrieves the instance from the given resource
 113   // object as a convenience. Returns NULL on failure.
 114   static PluginDispatcher* GetForResource(const Resource* resource);
 115
 116   // Implements the GetInterface function for the plugin to call to retrieve
 117   // a browser interface.
 118   static const void* GetBrowserInterface(const char* interface_name);
 119
 120   // Logs the given log message to the given instance, or, if the instance is
 121   // invalid, to all instances associated with all dispatchers. Used for
 122   // global log messages.
 123   static void LogWithSource(PP_Instance instance,
 124                             PP_LogLevel level,
 125                             const std::string& source,
 126                             const std::string& value);
 127
 128   const void* GetPluginInterface(const std::string& interface_name);
 129
 130   // You must call this function before anything else. Returns true on success.
 131   // The delegate pointer must outlive this class, ownership is not
 132   // transferred.
 133   bool InitPluginWithChannel(PluginDelegate* delegate,
 134                              base::ProcessId peer_pid,
 135                              const IPC::ChannelHandle& channel_handle,
 136                              bool is_client);
 137
 138   // Dispatcher overrides.
 139   virtual bool IsPlugin() const;
 140   virtual bool Send(IPC::Message* msg);
 141
 142   // IPC::Listener implementation.
 143   virtual bool OnMessageReceived(const IPC::Message& msg);
 144   virtual void OnChannelError();
 145
 146   // Keeps track of which dispatcher to use for each instance, active instances
 147   // and tracks associated data like the current size.
 148   void DidCreateInstance(PP_Instance instance);
 149   void DidDestroyInstance(PP_Instance instance);
 150
 151   // Gets the data for an existing instance, or NULL if the instance id doesn't
 152   // correspond to a known instance.
 153   InstanceData* GetInstanceData(PP_Instance instance);
 154
 155   // Returns the corresponding API. These are APIs not associated with a
 156   // resource. Guaranteed non-NULL.
 157   thunk::PPB_Instance_API* GetInstanceAPI();
 158   thunk::ResourceCreationAPI* GetResourceCreationAPI();
 159
 160   // Returns the Preferences.
 161   const Preferences& preferences() const { return preferences_; }
 162
 163   uint32 plugin_dispatcher_id() const { return plugin_dispatcher_id_; }
 164   bool incognito() const { return incognito_; }
 165
 166   // Dispatches the given resource message to the appropriate resource in the
 167   // plugin process. This should be wired to the various channels that messages
 168   // come in from various other processes.
 169   static void DispatchResourceReply(
 170       const ppapi::proxy::ResourceMessageReplyParams& reply_params,
 171       const IPC::Message& nested_msg);
 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 OnMsgResourceReply(
 182       const ppapi::proxy::ResourceMessageReplyParams& reply_params,
 183       const IPC::Message& nested_msg);
 184   void OnMsgSupportsInterface(const std::string& interface_name, bool* result);
 185   void OnMsgSetPreferences(const Preferences& prefs);
 186
 187   // Internal backed for DispatchResourceReply.
 188   static void LockedDispatchResourceReply(
 189       const ppapi::proxy::ResourceMessageReplyParams& reply_params,
 190       const IPC::Message& nested_msg);
 191
 192   virtual bool SendMessage(IPC::Message* msg);
 193
 194   PluginDelegate* plugin_delegate_;
 195
 196   // Contains all the plugin interfaces we've queried. The mapped value will
 197   // be the pointer to the interface pointer supplied by the plugin if it's
 198   // supported, or NULL if it's not supported. This allows us to cache failures
 199   // and not req-query if a plugin doesn't support the interface.
 200   typedef base::hash_map<std::string, const void*> InterfaceMap;
 201   InterfaceMap plugin_interfaces_;
 202
 203   typedef base::hash_map<PP_Instance, InstanceData> InstanceDataMap;
 204   InstanceDataMap instance_map_;
 205
 206   // The preferences sent from the host. We only want to set this once, which
 207   // is what the received_preferences_ indicates. See OnMsgSetPreferences.
 208   bool received_preferences_;
 209   Preferences preferences_;
 210
 211   uint32 plugin_dispatcher_id_;
 212
 213   // Set to true when the instances associated with this dispatcher are
 214   // incognito mode.
 215   bool incognito_;
 216
 217   // A filter for sending messages from threads other than the main thread.
 218   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 219
 220   DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
 221 };
 222
 223 }  // namespace proxy
 224 }  // namespace ppapi
 225
 226 #endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_