Check-in rlz code to src\rlz from http://code.google.com/p/rlz/.

rlz/win/lib/machine_id_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 <windows.h>
+#include <Sddl.h>  // For ConvertSidToStringSidW.
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/string16.h"
+#include "rlz/lib/assert.h"
+
+namespace rlz_lib {
+
+namespace {
+
+bool GetSystemVolumeSerialNumber(int* number) {
+  if (!number)
+    return false;
+
+  *number = 0;
+
+  // Find the system root path (e.g: C:\).
+  wchar_t system_path[MAX_PATH + 1];
+  if (!GetSystemDirectoryW(system_path, MAX_PATH))
+    return false;
+
+  wchar_t* first_slash = wcspbrk(system_path, L"\\/");
+  if (first_slash != NULL)
+    *(first_slash + 1) = 0;
+
+  DWORD number_local = 0;
+  if (!GetVolumeInformationW(system_path, NULL, 0, &number_local, NULL, NULL,
+                             NULL, 0))
+    return false;
+
+  *number = number_local;
+  return true;
+}
+
+bool GetComputerSid(const wchar_t* account_name, SID* sid, DWORD sid_size) {
+  static const DWORD kStartDomainLength = 128;  // reasonable to start with
+
+  scoped_array<wchar_t> domain_buffer(new wchar_t[kStartDomainLength]);
+  DWORD domain_size = kStartDomainLength;
+  DWORD sid_dword_size = sid_size;
+  SID_NAME_USE sid_name_use;
+
+  BOOL success = ::LookupAccountNameW(NULL, account_name, sid,
+                                      &sid_dword_size, domain_buffer.get(),
+                                      &domain_size, &sid_name_use);
+  if (!success && ::GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+    // We could have gotten the insufficient buffer error because
+    // one or both of sid and szDomain was too small. Check for that
+    // here.
+    if (sid_dword_size > sid_size)
+      return false;
+
+    if (domain_size > kStartDomainLength)
+      domain_buffer.reset(new wchar_t[domain_size]);
+
+    success = ::LookupAccountNameW(NULL, account_name, sid, &sid_dword_size,
+                                   domain_buffer.get(), &domain_size,
+                                   &sid_name_use);
+  }
+
+  return success != FALSE;
+}
+
+std::wstring ConvertSidToString(SID* sid) {
+  std::wstring sid_string;
+#if _WIN32_WINNT >= 0x500
+  wchar_t* sid_buffer = NULL;
+  if (ConvertSidToStringSidW(sid, &sid_buffer)) {
+    sid_string = sid_buffer;
+    LocalFree(sid_buffer);
+  }
+#else
+  SID_IDENTIFIER_AUTHORITY* sia = ::GetSidIdentifierAuthority(sid);
+
+  if(sia->Value[0] || sia->Value[1]) {
+    base::SStringPrintf(
+        &sid_string, L"S-%d-0x%02hx%02hx%02hx%02hx%02hx%02hx",
+        SID_REVISION, (USHORT)sia->Value[0], (USHORT)sia->Value[1],
+        (USHORT)sia->Value[2], (USHORT)sia->Value[3], (USHORT)sia->Value[4],
+        (USHORT)sia->Value[5]);
+  } else {
+    ULONG authority = 0;
+    for (int i = 2; i < 6; ++i) {
+      authority <<= 8;
+      authority |= sia->Value[i];
+    }
+    base::SStringPrintf(&sid_string, L"S-%d-%lu", SID_REVISION, authority);
+  }
+
+  int sub_auth_count = *::GetSidSubAuthorityCount(sid);
+  for(int i = 0; i < sub_auth_count; ++i)
+    base::StringAppendF(&sid_string, L"-%lu", *::GetSidSubAuthority(sid, i));
+#endif
+
+  return sid_string;
+}
+
+}  // namespace
+
+bool GetRawMachineId(string16* sid_string, int* volume_id) {
+  // Calculate the Windows SID.
+
+  wchar_t computer_name[MAX_COMPUTERNAME_LENGTH + 1] = {0};
+  DWORD size = arraysize(computer_name);
+
+  if (GetComputerNameW(computer_name, &size)) {
+    char sid_buffer[SECURITY_MAX_SID_SIZE];
+    SID* sid = reinterpret_cast<SID*>(sid_buffer);
+    if (GetComputerSid(computer_name, sid, SECURITY_MAX_SID_SIZE)) {
+      *sid_string = ConvertSidToString(sid);
+    }
+  }
+
+  // Get the system drive volume serial number.
+  *volume_id = 0;
+  if (!GetSystemVolumeSerialNumber(volume_id)) {
+    ASSERT_STRING("GetMachineId: Failed to retrieve volume serial number");
+    *volume_id = 0;
+  }
+
+  return true;
+}
+
+}  // namespace rlz_lib