content/browser/ppapi_plugin_process_host.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 CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
   6 #define CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
   7
   8 #include <queue>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/files/file_path.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/process/process.h"
  16 #include "base/strings/string16.h"
  17 #include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
  18 #include "content/browser/renderer_host/pepper/pepper_message_filter.h"
  19 #include "content/public/browser/browser_child_process_host_delegate.h"
  20 #include "content/public/browser/browser_child_process_host_iterator.h"
  21 #include "ipc/ipc_sender.h"
  22 #include "ppapi/shared_impl/ppapi_permissions.h"
  23
  24 namespace content {
  25 class BrowserChildProcessHostImpl;
  26 class ResourceContext;
  27 struct PepperPluginInfo;
  28
  29 // Process host for PPAPI plugin and broker processes.
  30 // When used for the broker, interpret all references to "plugin" with "broker".
  31 class PpapiPluginProcessHost : public BrowserChildProcessHostDelegate,
  32                                public IPC::Sender {
  33  public:
  34   class Client {
  35    public:
  36     // Gets the information about the renderer that's requesting the channel.
  37     virtual void GetPpapiChannelInfo(base::ProcessHandle* renderer_handle,
  38                                      int* renderer_id) = 0;
  39
  40     // Called when the channel is asynchronously opened to the plugin or on
  41     // error. On error, the parameters should be:
  42     //   base::kNullProcessHandle
  43     //   IPC::ChannelHandle(),
  44     //   0
  45     virtual void OnPpapiChannelOpened(
  46         const IPC::ChannelHandle& channel_handle,
  47         base::ProcessId plugin_pid,
  48         int plugin_child_id) = 0;
  49
  50     // Returns true if the current connection is off-the-record.
  51     virtual bool OffTheRecord() = 0;
  52
  53    protected:
  54     virtual ~Client() {}
  55   };
  56
  57   class PluginClient : public Client {
  58    public:
  59     // Returns the resource context for the renderer requesting the channel.
  60     virtual ResourceContext* GetResourceContext() = 0;
  61
  62    protected:
  63     ~PluginClient() override {}
  64   };
  65
  66   class BrokerClient : public Client {
  67    protected:
  68     ~BrokerClient() override {}
  69   };
  70
  71   ~PpapiPluginProcessHost() override;
  72
  73   static PpapiPluginProcessHost* CreatePluginHost(
  74       const PepperPluginInfo& info,
  75       const base::FilePath& profile_data_directory);
  76   static PpapiPluginProcessHost* CreateBrokerHost(
  77       const PepperPluginInfo& info);
  78
  79   // Notification that a PP_Instance has been created and the associated
  80   // renderer related data including the RenderView/Process pair for the given
  81   // plugin. This is necessary so that when the plugin calls us with a
  82   // PP_Instance we can find the RenderView associated with it without trusting
  83   // the plugin.
  84   static void DidCreateOutOfProcessInstance(
  85       int plugin_process_id,
  86       int32 pp_instance,
  87       const PepperRendererInstanceData& instance_data);
  88
  89   // The opposite of DIdCreate... above.
  90   static void DidDeleteOutOfProcessInstance(int plugin_process_id,
  91                                             int32 pp_instance);
  92
  93   // Returns the instances that match the specified process name.
  94   // It can only be called on the IO thread.
  95   static void FindByName(const base::string16& name,
  96                          std::vector<PpapiPluginProcessHost*>* hosts);
  97
  98   // IPC::Sender implementation:
  99   bool Send(IPC::Message* message) override;
 100
 101   // Opens a new channel to the plugin. The client will be notified when the
 102   // channel is ready or if there's an error.
 103   void OpenChannelToPlugin(Client* client);
 104
 105   BrowserPpapiHostImpl* host_impl() { return host_impl_.get(); }
 106   const BrowserChildProcessHostImpl* process() { return process_.get(); }
 107   const base::FilePath& plugin_path() const { return plugin_path_; }
 108   const base::FilePath& profile_data_directory() const {
 109     return profile_data_directory_;
 110   }
 111
 112   // The client pointer must remain valid until its callback is issued.
 113
 114  private:
 115   class PluginNetworkObserver;
 116
 117   // Constructors for plugin and broker process hosts, respectively.
 118   // You must call Init before doing anything else.
 119   PpapiPluginProcessHost(const PepperPluginInfo& info,
 120                          const base::FilePath& profile_data_directory);
 121   PpapiPluginProcessHost();
 122
 123   // Actually launches the process with the given plugin info. Returns true
 124   // on success (the process was spawned).
 125   bool Init(const PepperPluginInfo& info);
 126
 127   void RequestPluginChannel(Client* client);
 128
 129   void OnProcessLaunched() override;
 130
 131   void OnProcessCrashed(int exit_code) override;
 132   bool OnMessageReceived(const IPC::Message& msg) override;
 133   void OnChannelConnected(int32 peer_pid) override;
 134   void OnChannelError() override;
 135
 136   void CancelRequests();
 137
 138   // IPC message handlers.
 139   void OnRendererPluginChannelCreated(const IPC::ChannelHandle& handle);
 140
 141   // Handles most requests from the plugin. May be NULL.
 142   scoped_refptr<PepperMessageFilter> filter_;
 143
 144   ppapi::PpapiPermissions permissions_;
 145   scoped_ptr<BrowserPpapiHostImpl> host_impl_;
 146
 147   // Observes network changes. May be NULL.
 148   scoped_ptr<PluginNetworkObserver> network_observer_;
 149
 150   // Channel requests that we are waiting to send to the plugin process once
 151   // the channel is opened.
 152   std::vector<Client*> pending_requests_;
 153
 154   // Channel requests that we have already sent to the plugin process, but
 155   // haven't heard back about yet.
 156   std::queue<Client*> sent_requests_;
 157
 158   // Path to the plugin library.
 159   base::FilePath plugin_path_;
 160
 161   // Path to the top-level plugin data directory (differs based upon profile).
 162   base::FilePath profile_data_directory_;
 163
 164   const bool is_broker_;
 165
 166   scoped_ptr<BrowserChildProcessHostImpl> process_;
 167
 168   DISALLOW_COPY_AND_ASSIGN(PpapiPluginProcessHost);
 169 };
 170
 171 class PpapiPluginProcessHostIterator
 172     : public BrowserChildProcessHostTypeIterator<
 173           PpapiPluginProcessHost> {
 174  public:
 175   PpapiPluginProcessHostIterator()
 176       : BrowserChildProcessHostTypeIterator<
 177           PpapiPluginProcessHost>(PROCESS_TYPE_PPAPI_PLUGIN) {}
 178 };
 179
 180 class PpapiBrokerProcessHostIterator
 181     : public BrowserChildProcessHostTypeIterator<
 182           PpapiPluginProcessHost> {
 183  public:
 184   PpapiBrokerProcessHostIterator()
 185       : BrowserChildProcessHostTypeIterator<
 186           PpapiPluginProcessHost>(PROCESS_TYPE_PPAPI_BROKER) {}
 187 };
 188
 189 }  // namespace content
 190
 191 #endif  // CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 192