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      1 // Copyright (c) 2013 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 "chrome/renderer/pepper/pepper_shared_memory_message_filter.h"
      6 
      7 #include "base/memory/scoped_ptr.h"
      8 #include "base/memory/shared_memory.h"
      9 #include "base/process/process_handle.h"
     10 #include "content/public/common/content_client.h"
     11 #include "content/public/renderer/pepper_plugin_instance.h"
     12 #include "content/public/renderer/render_thread.h"
     13 #include "content/public/renderer/renderer_ppapi_host.h"
     14 #include "ppapi/host/ppapi_host.h"
     15 #include "ppapi/proxy/ppapi_messages.h"
     16 #include "ppapi/shared_impl/var_tracker.h"
     17 
     18 PepperSharedMemoryMessageFilter::PepperSharedMemoryMessageFilter(
     19     content::RendererPpapiHost* host)
     20     : InstanceMessageFilter(host->GetPpapiHost()), host_(host) {}
     21 
     22 PepperSharedMemoryMessageFilter::~PepperSharedMemoryMessageFilter() {}
     23 
     24 bool PepperSharedMemoryMessageFilter::OnInstanceMessageReceived(
     25     const IPC::Message& msg) {
     26   bool handled = true;
     27   IPC_BEGIN_MESSAGE_MAP(PepperSharedMemoryMessageFilter, msg)
     28     IPC_MESSAGE_HANDLER(PpapiHostMsg_SharedMemory_CreateSharedMemory,
     29                         OnHostMsgCreateSharedMemory)
     30     IPC_MESSAGE_UNHANDLED(handled = false)
     31   IPC_END_MESSAGE_MAP()
     32   return handled;
     33 }
     34 
     35 bool PepperSharedMemoryMessageFilter::Send(IPC::Message* msg) {
     36   return host_->GetPpapiHost()->Send(msg);
     37 }
     38 
     39 void PepperSharedMemoryMessageFilter::OnHostMsgCreateSharedMemory(
     40     PP_Instance instance,
     41     uint32_t size,
     42     int* host_handle_id,
     43     ppapi::proxy::SerializedHandle* plugin_handle) {
     44   plugin_handle->set_null_shmem();
     45   *host_handle_id = -1;
     46   scoped_ptr<base::SharedMemory> shm(content::RenderThread::Get()
     47                                          ->HostAllocateSharedMemoryBuffer(size)
     48                                          .Pass());
     49   if (!shm.get())
     50     return;
     51 
     52   base::SharedMemoryHandle host_shm_handle;
     53   shm->ShareToProcess(base::GetCurrentProcessHandle(), &host_shm_handle);
     54   *host_handle_id =
     55       content::PepperPluginInstance::Get(instance)
     56           ->GetVarTracker()
     57           ->TrackSharedMemoryHandle(instance, host_shm_handle, size);
     58 
     59   base::PlatformFile host_handle =
     60 #if defined(OS_WIN)
     61       host_shm_handle;
     62 #elif defined(OS_POSIX)
     63       host_shm_handle.fd;
     64 #else
     65 #error Not implemented.
     66 #endif
     67   // We set auto_close to false since we need our file descriptor to
     68   // actually be duplicated on linux. The shared memory destructor will
     69   // close the original handle for us.
     70   plugin_handle->set_shmem(host_->ShareHandleWithRemote(host_handle, false),
     71                            size);
     72 }
     73