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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 namespace chrome {
     19 
     20 PepperSharedMemoryMessageFilter::PepperSharedMemoryMessageFilter(
     21     content::RendererPpapiHost* host)
     22     : InstanceMessageFilter(host->GetPpapiHost()),
     23       host_(host) {
     24 }
     25 
     26 PepperSharedMemoryMessageFilter::~PepperSharedMemoryMessageFilter() {
     27 }
     28 
     29 bool PepperSharedMemoryMessageFilter::OnInstanceMessageReceived(
     30     const IPC::Message& msg) {
     31   bool handled = true;
     32   IPC_BEGIN_MESSAGE_MAP(PepperSharedMemoryMessageFilter, msg)
     33     IPC_MESSAGE_HANDLER(PpapiHostMsg_SharedMemory_CreateSharedMemory,
     34                         OnHostMsgCreateSharedMemory)
     35     IPC_MESSAGE_UNHANDLED(handled = false)
     36   IPC_END_MESSAGE_MAP()
     37   return handled;
     38 }
     39 
     40 bool PepperSharedMemoryMessageFilter::Send(IPC::Message* msg) {
     41   return host_->GetPpapiHost()->Send(msg);
     42 }
     43 
     44 void PepperSharedMemoryMessageFilter::OnHostMsgCreateSharedMemory(
     45     PP_Instance instance,
     46     uint32_t size,
     47     int* host_handle_id,
     48     ppapi::proxy::SerializedHandle* plugin_handle) {
     49   plugin_handle->set_null_shmem();
     50   *host_handle_id = -1;
     51   scoped_ptr<base::SharedMemory> shm(content::RenderThread::Get()->
     52       HostAllocateSharedMemoryBuffer(size).Pass());
     53   if (!shm.get())
     54     return;
     55 
     56   base::SharedMemoryHandle host_shm_handle;
     57   shm->ShareToProcess(base::GetCurrentProcessHandle(), &host_shm_handle);
     58   *host_handle_id = content::PepperPluginInstance::Get(instance)->
     59       GetVarTracker()->TrackSharedMemoryHandle(instance, host_shm_handle, size);
     60 
     61   base::PlatformFile host_handle =
     62 #if defined(OS_WIN)
     63       host_shm_handle;
     64 #elif defined(OS_POSIX)
     65       host_shm_handle.fd;
     66 #else
     67   #error Not implemented.
     68 #endif
     69   // We set auto_close to false since we need our file descriptor to
     70   // actually be duplicated on linux. The shared memory destructor will
     71   // close the original handle for us.
     72   plugin_handle->set_shmem(
     73       host_->ShareHandleWithRemote(host_handle, false), size);
     74 }
     75 
     76 }  // namespace chrome
     77