[Chromoting] The desktop process now creates a pre-connected pipe and passes (with some help of the…

remoting/host/desktop_session_agent_win.cc

+// 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.
+
+#include "remoting/host/desktop_session_agent.h"
+
+#include "base/logging.h"
+#include "base/single_thread_task_runner.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "base/win/scoped_handle.h"
+#include "base/win/win_util.h"
+#include "ipc/ipc_channel.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "remoting/base/auto_thread_task_runner.h"
+#include "remoting/host/win/launch_process_with_token.h"
+
+using base::win::ScopedHandle;
+
+namespace remoting {
+
+// Provides screen/audio capturing and input injection services for
+// the network process.
+class DesktopSessionAgentWin : public DesktopSessionAgent {
+ public:
+  DesktopSessionAgentWin(
+      scoped_refptr<AutoThreadTaskRunner> caller_task_runner,
+      scoped_refptr<AutoThreadTaskRunner> io_task_runner);
+  virtual ~DesktopSessionAgentWin();
+
+ protected:
+  virtual bool DoCreateNetworkChannel(
+      IPC::PlatformFileForTransit* client_out,
+      scoped_ptr<IPC::ChannelProxy>* server_out) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DesktopSessionAgentWin);
+};
+
+DesktopSessionAgentWin::DesktopSessionAgentWin(
+    scoped_refptr<AutoThreadTaskRunner> caller_task_runner,
+    scoped_refptr<AutoThreadTaskRunner> io_task_runner)
+    : DesktopSessionAgent(caller_task_runner, io_task_runner) {
+}
+
+DesktopSessionAgentWin::~DesktopSessionAgentWin() {
+}
+
+bool DesktopSessionAgentWin::DoCreateNetworkChannel(
+    IPC::PlatformFileForTransit* client_out,
+    scoped_ptr<IPC::ChannelProxy>* server_out) {
+  // Generate a unique name for the channel.
+  std::string channel_name = IPC::Channel::GenerateUniqueRandomChannelID();
+
+  // presubmit: allow wstring
+  std::wstring user_sid;
+  if (!base::win::GetUserSidString(&user_sid)) {
+    LOG(ERROR) << "Failed to query the current user SID.";
+    return false;
+  }
+
+  // Create a security descriptor that will be used to protect the named pipe in
+  // between CreateNamedPipe() and CreateFile() calls before it will be passed
+  // to the network process. It gives full access to the account that
+  // the calling code is running under and  denies access by anyone else.
+  std::string security_descriptor = base::StringPrintf(
+      "O:%1$sG:%1$sD:(A;;GA;;;%1$s)", WideToUTF8(user_sid).c_str());
+
+  // Create a connected IPC channel.
+  ScopedHandle client;
+  scoped_ptr<IPC::ChannelProxy> server;
+  if (!CreateConnectedIpcChannel(channel_name, security_descriptor,
+                                 io_task_runner(), this, &client, &server)) {
+    return false;
+  }
+
+  *client_out = client.Take();
+  *server_out = server.Pass();
+  return true;
+}
+
+// static
+scoped_ptr<DesktopSessionAgent> DesktopSessionAgent::Create(
+    scoped_refptr<AutoThreadTaskRunner> caller_task_runner,
+    scoped_refptr<AutoThreadTaskRunner> io_task_runner) {
+  return scoped_ptr<DesktopSessionAgent>(new DesktopSessionAgentWin(
+      caller_task_runner, io_task_runner));
+}
+
+}  // namespace remoting