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      1 // Copyright 2014 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 "ppapi/nacl_irt/manifest_service.h"
      6 
      7 #include "base/message_loop/message_loop_proxy.h"
      8 #include "ipc/ipc_channel_handle.h"
      9 #include "ipc/ipc_channel_proxy.h"
     10 #include "ipc/ipc_sync_message_filter.h"
     11 #include "native_client/src/trusted/service_runtime/include/sys/errno.h"
     12 #include "ppapi/nacl_irt/irt_manifest.h"
     13 #include "ppapi/nacl_irt/plugin_startup.h"
     14 #include "ppapi/proxy/ppapi_messages.h"
     15 
     16 namespace ppapi {
     17 
     18 const char kFilePrefix[] = "files/";
     19 
     20 // IPC channel is asynchronously set up. So, the NaCl process may try to
     21 // send a OpenResource message to the host before the connection is
     22 // established. In such a case, it is necessary to wait for the set up
     23 // completion.
     24 class ManifestMessageFilter : public IPC::SyncMessageFilter {
     25  public:
     26   ManifestMessageFilter(base::WaitableEvent* shutdown_event)
     27       : SyncMessageFilter(shutdown_event),
     28         connected_event_(
     29             true /* manual_reset */, false /* initially_signaled */) {
     30   }
     31 
     32   virtual bool Send(IPC::Message* message) OVERRIDE {
     33     // Wait until set up is actually done.
     34     connected_event_.Wait();
     35     return SyncMessageFilter::Send(message);
     36   }
     37 
     38   // When set up is done, OnFilterAdded is called on IO thread. Unblocks the
     39   // Send().
     40   virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE {
     41     SyncMessageFilter::OnFilterAdded(sender);
     42     connected_event_.Signal();
     43   }
     44 
     45   // If an error is found, unblocks the Send(), too, to return an error.
     46   virtual void OnChannelError() OVERRIDE {
     47     SyncMessageFilter::OnChannelError();
     48     connected_event_.Signal();
     49   }
     50 
     51   // Similar to OnChannelError, unblocks the Send() on the channel closing.
     52   virtual void OnChannelClosing() OVERRIDE {
     53     SyncMessageFilter::OnChannelClosing();
     54     connected_event_.Signal();
     55   }
     56 
     57  private:
     58   base::WaitableEvent connected_event_;
     59 
     60   DISALLOW_COPY_AND_ASSIGN(ManifestMessageFilter);
     61 };
     62 
     63 ManifestService::ManifestService(
     64     const IPC::ChannelHandle& handle,
     65     scoped_refptr<base::MessageLoopProxy> io_message_loop,
     66     base::WaitableEvent* shutdown_event) {
     67   filter_ = new ManifestMessageFilter(shutdown_event);
     68   channel_ = IPC::ChannelProxy::Create(handle,
     69                                        IPC::Channel::MODE_SERVER,
     70                                        NULL,  // Listener
     71                                        io_message_loop);
     72   channel_->AddFilter(filter_.get());
     73 }
     74 
     75 ManifestService::~ManifestService() {
     76 }
     77 
     78 void ManifestService::StartupInitializationComplete() {
     79   filter_->Send(new PpapiHostMsg_StartupInitializationComplete);
     80 }
     81 
     82 bool ManifestService::OpenResource(const char* file, int* fd) {
     83   // OpenResource will return INVALID SerializedHandle, if it is not supported.
     84   // Specifically, PNaCl doesn't support open resource.
     85   ppapi::proxy::SerializedHandle ipc_fd;
     86   if (!filter_->Send(new PpapiHostMsg_OpenResource(
     87           std::string(kFilePrefix) + file, &ipc_fd)) ||
     88       !ipc_fd.is_file()) {
     89     LOG(ERROR) << "ManifestService::OpenResource failed:" << file;
     90     *fd = -1;
     91     return false;
     92   }
     93 
     94   *fd = ipc_fd.descriptor().fd;
     95   return true;
     96 }
     97 
     98 int IrtOpenResource(const char* file, int* fd) {
     99   // Remove leading '/' character.
    100   if (file[0] == '/')
    101     ++file;
    102 
    103   ManifestService* manifest_service = GetManifestService();
    104   if (manifest_service == NULL ||
    105       !manifest_service->OpenResource(file, fd)) {
    106     return NACL_ABI_EIO;
    107   }
    108 
    109   return (*fd == -1) ? NACL_ABI_ENOENT : 0;
    110 }
    111 
    112 }  // namespace ppapi
    113