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      1 // Copyright 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 #ifndef CHROME_NACL_NACL_LISTENER_H_
      6 #define CHROME_NACL_NACL_LISTENER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/synchronization/waitable_event.h"
     12 #include "base/threading/thread.h"
     13 #include "components/nacl/common/nacl_types.h"
     14 #include "components/nacl/loader/nacl_trusted_listener.h"
     15 #include "ipc/ipc_listener.h"
     16 
     17 namespace base {
     18 class MessageLoopProxy;
     19 }
     20 
     21 namespace IPC {
     22 class SyncChannel;
     23 class SyncMessageFilter;
     24 }
     25 
     26 // The NaClListener is an IPC channel listener that waits for a
     27 // request to start a NaCl module.
     28 class NaClListener : public IPC::Listener {
     29  public:
     30   NaClListener();
     31   virtual ~NaClListener();
     32   // Listen for a request to launch a NaCl module.
     33   void Listen();
     34 
     35   bool Send(IPC::Message* msg);
     36 
     37   void set_uses_nonsfi_mode(bool uses_nonsfi_mode) {
     38     uses_nonsfi_mode_ = uses_nonsfi_mode;
     39   }
     40 #if defined(OS_LINUX)
     41   void set_prereserved_sandbox_size(size_t prereserved_sandbox_size) {
     42     prereserved_sandbox_size_ = prereserved_sandbox_size;
     43   }
     44 #endif
     45 #if defined(OS_POSIX)
     46   void set_number_of_cores(int number_of_cores) {
     47     number_of_cores_ = number_of_cores;
     48   }
     49 #endif
     50 
     51  private:
     52   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
     53 
     54   void OnStart(const nacl::NaClStartParams& params);
     55 
     56   // Non-SFI version of OnStart().
     57   void StartNonSfi(const nacl::NaClStartParams& params);
     58 
     59   IPC::ChannelHandle CreateTrustedListener(
     60       base::MessageLoopProxy* message_loop_proxy,
     61       base::WaitableEvent* shutdown_event);
     62 
     63   // A channel back to the browser.
     64   scoped_ptr<IPC::SyncChannel> channel_;
     65 
     66   // A filter that allows other threads to use the channel.
     67   scoped_refptr<IPC::SyncMessageFilter> filter_;
     68 
     69   base::WaitableEvent shutdown_event_;
     70   base::Thread io_thread_;
     71 
     72   bool uses_nonsfi_mode_;
     73 #if defined(OS_LINUX)
     74   size_t prereserved_sandbox_size_;
     75 #endif
     76 #if defined(OS_POSIX)
     77   // The outer sandbox on Linux and OSX prevents
     78   // sysconf(_SC_NPROCESSORS) from working; in Windows, there are no
     79   // problems with invoking GetSystemInfo.  Therefore, only in
     80   // OS_POSIX do we need to supply the number of cores into the
     81   // NaClChromeMainArgs object.
     82   int number_of_cores_;
     83 #endif
     84 
     85   scoped_refptr<NaClTrustedListener> trusted_listener_;
     86 
     87   // Used to identify what thread we're on.
     88   base::MessageLoop* main_loop_;
     89 
     90   DISALLOW_COPY_AND_ASSIGN(NaClListener);
     91 };
     92 
     93 #endif  // CHROME_NACL_NACL_LISTENER_H_
     94