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// Copyright 2014 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 "components/metrics/machine_id_provider.h"
#include <windows.h>
#include <stdint.h>
#include <winioctl.h>
#include "base/base_paths.h"
#include "base/files/file_path.h"
#include "base/path_service.h"
#include "base/threading/thread_restrictions.h"
#include "base/win/scoped_handle.h"
namespace metrics {
MachineIdProvider::MachineIdProvider() {
}
MachineIdProvider::~MachineIdProvider() {
}
// On windows, the machine id is based on the serial number of the drive Chrome
// is running from.
std::string MachineIdProvider::GetMachineId() {
base::ThreadRestrictions::AssertIOAllowed();
// Use the program's path to get the drive used for the machine id. This means
// that whenever the underlying drive changes, it's considered a new machine.
// This is fine as we do not support migrating Chrome installs to new drives.
base::FilePath executable_path;
if (!PathService::Get(base::FILE_EXE, &executable_path)) {
NOTREACHED();
return std::string();
}
std::vector<base::FilePath::StringType> path_components;
executable_path.GetComponents(&path_components);
if (path_components.empty()) {
NOTREACHED();
return std::string();
}
base::FilePath::StringType drive_name = L"\\\\.\\" + path_components[0];
base::win::ScopedHandle drive_handle(
CreateFile(drive_name.c_str(),
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL));
STORAGE_PROPERTY_QUERY query = {};
query.PropertyId = StorageDeviceProperty;
query.QueryType = PropertyStandardQuery;
// Perform an initial query to get the number of bytes being returned.
DWORD bytes_returned;
STORAGE_DESCRIPTOR_HEADER header = {};
BOOL status = DeviceIoControl(drive_handle.Get(),
IOCTL_STORAGE_QUERY_PROPERTY,
&query,
sizeof(STORAGE_PROPERTY_QUERY),
&header,
sizeof(STORAGE_DESCRIPTOR_HEADER),
&bytes_returned,
NULL);
if (!status)
return std::string();
// Query for the actual serial number.
std::vector<int8_t> output_buf(header.Size);
status = DeviceIoControl(drive_handle.Get(),
IOCTL_STORAGE_QUERY_PROPERTY,
&query,
sizeof(STORAGE_PROPERTY_QUERY),
&output_buf[0],
output_buf.size(),
&bytes_returned,
NULL);
if (!status)
return std::string();
const STORAGE_DEVICE_DESCRIPTOR* device_descriptor =
reinterpret_cast<STORAGE_DEVICE_DESCRIPTOR*>(&output_buf[0]);
// The serial number is stored in the |output_buf| as a null-terminated
// string starting at the specified offset.
const DWORD offset = device_descriptor->SerialNumberOffset;
if (offset >= output_buf.size())
return std::string();
// Make sure that the null-terminator exists.
const std::vector<int8_t>::iterator serial_number_begin =
output_buf.begin() + offset;
const std::vector<int8_t>::iterator null_location =
std::find(serial_number_begin, output_buf.end(), '\0');
if (null_location == output_buf.end())
return std::string();
const char* serial_number =
reinterpret_cast<const char*>(&output_buf[offset]);
return std::string(serial_number);
}
// static
MachineIdProvider* MachineIdProvider::CreateInstance() {
return new MachineIdProvider();
}
} // namespace metrics
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