Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/device_id_win.cc

-// Copyright 2015 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 "chrome/browser/prefs/tracked/device_id.h"
-
-#include <windows.h>
-#include <sddl.h>  // For ConvertSidToStringSidA.
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-
-MachineIdStatus GetDeterministicMachineSpecificId(std::string* machine_id) {
-  DCHECK(machine_id);
-
-  wchar_t computer_name[MAX_COMPUTERNAME_LENGTH + 1] = {};
-  DWORD computer_name_size = arraysize(computer_name);
-
-  if (!::GetComputerNameW(computer_name, &computer_name_size))
-    return MachineIdStatus::FAILURE;
-
-  DWORD sid_size = SECURITY_MAX_SID_SIZE;
-  char sid_buffer[SECURITY_MAX_SID_SIZE];
-  SID* sid = reinterpret_cast<SID*>(sid_buffer);
-  DWORD domain_size = 128;  // Will expand below if needed.
-  scoped_ptr<wchar_t[]> domain_buffer(new wchar_t[domain_size]);
-  SID_NAME_USE sid_name_use;
-
-  // Although the fifth argument to |LookupAccountNameW()|,
-  // |ReferencedDomainName|, is annotated as |_Out_opt_|, if a null
-  // value is passed in, zero is returned and |GetLastError()| will
-  // return |ERROR_INSUFFICIENT_BUFFER| (assuming that nothing else went
-  // wrong). In order to ensure that the call to |LookupAccountNameW()|
-  // has succeeded, it is necessary to include the following logic and
-  // obtain the domain name.
-  if (!::LookupAccountNameW(nullptr, computer_name, sid, &sid_size,
-                            domain_buffer.get(), &domain_size, &sid_name_use)) {
-    // If the initial size of |domain_buffer| was too small, the
-    // required size is now found in |domain_size|. Resize and try
-    // again.
-    if (::GetLastError() != ERROR_INSUFFICIENT_BUFFER)
-      return MachineIdStatus::FAILURE;
-
-    domain_buffer.reset(new wchar_t[domain_size]);
-    if (!::LookupAccountNameW(nullptr, computer_name, sid, &sid_size,
-                              domain_buffer.get(), &domain_size,
-                              &sid_name_use)) {
-      return MachineIdStatus::FAILURE;
-    }
-  }
-
-  // Ensure that the correct type of SID was obtained. The
-  // |LookupAccountNameW()| function seems to always return
-  // |SidTypeDomain| instead of |SidTypeComputer| when the computer name
-  // is passed in as its second argument and therefore both enum values
-  // will be considered acceptable. If the computer name and user name
-  // coincide, |LookupAccountNameW()| seems to always return the machine
-  // SID and set the returned enum to |SidTypeDomain|.
-  DCHECK(sid_name_use == SID_NAME_USE::SidTypeComputer ||
-         sid_name_use == SID_NAME_USE::SidTypeDomain);
-
-  char* sid_string = nullptr;
-  if (!::ConvertSidToStringSidA(sid, &sid_string))
-    return MachineIdStatus::FAILURE;
-
-  *machine_id = sid_string;
-  ::LocalFree(sid_string);
-
-  return MachineIdStatus::SUCCESS;
-}