Pass the client end handle of the network-to-daemon IPC channel via handle inheritance.

remoting/host/win/unprivileged_process_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_WIN_UNPRIVILEGED_PROCESS_DELEGATE_H_
 #define REMOTING_HOST_WIN_UNPRIVILEGED_PROCESS_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/win/scoped_handle.h"
 #include "remoting/host/win/worker_process_launcher.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 } // namespace base
 
+namespace IPC {
+class ChannelProxy;
+class Listener;
+class Message;
+} // namespace IPC
+
 namespace remoting {
 
 // Implements logic for launching and monitoring a worker process under a less
 // privileged user account.
 class UnprivilegedProcessDelegate : public WorkerProcessLauncher::Delegate {
  public:
   UnprivilegedProcessDelegate(
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       const FilePath& binary_path);
   virtual ~UnprivilegedProcessDelegate();
 
+  // IPC::Sender implementation.
+  virtual bool Send(IPC::Message* message) OVERRIDE;
+
   // WorkerProcessLauncher::Delegate implementation.
   virtual DWORD GetExitCode() OVERRIDE;
   virtual void KillProcess(DWORD exit_code) OVERRIDE;
   virtual bool LaunchProcess(
-      const std::string& channel_name,
+      IPC::Listener* delegate,
       base::win::ScopedHandle* process_exit_event_out) OVERRIDE;
 
  private:
+  // Creates an already connected IPC channel. The server end of the channel
+  // is wrapped into a channel proxy that will invoke methods of |delegate|
+  // on the |main_task_runner| thread while using |io_task_runner| to send and
+  // receive messages in the background. The client end is returned as
+  // an inheritable NT handle.
+  bool CreateConnectedIpcChannel(const std::string channel_name,

[simonmorris, 2012/10/12 16:31:13]

string -> string& ?

[alexeypa (please no reviews), 2012/10/12 18:44:39]

Done.

+                                 IPC::Listener* delegate,
+                                 base::win::ScopedHandle* client_out,
+                                 scoped_ptr<IPC::ChannelProxy>* server_out);
+
   // The task runner all public methods of this class should be called on.
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   // The task runner serving job object notifications.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // Path to the worker process binary.
   FilePath binary_path_;
 
+  // The server end of the IPC channel used to commonicate to the worker

[simonmorris, 2012/10/12 16:31:13]

commonicate -> communicate

[alexeypa (please no reviews), 2012/10/12 18:44:39]

Done.

+  // process.
+  scoped_ptr<IPC::ChannelProxy> channel_;
+
   // The handle of the worker process, if launched.
   base::win::ScopedHandle worker_process_;
 
   DISALLOW_COPY_AND_ASSIGN(UnprivilegedProcessDelegate);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_WIN_UNPRIVILEGED_PROCESS_DELEGATE_H_