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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/utility/image_writer/image_writer.h"
#include <windows.h>
#include <setupapi.h>
#include <stddef.h>
#include <winioctl.h>
#include "base/containers/heap_array.h"
#include "base/logging.h"
#include "chrome/utility/image_writer/error_message_strings.h"
namespace image_writer {
const size_t kStorageQueryBufferSize = 1024;
bool ImageWriter::IsValidDevice() {
base::win::ScopedHandle device_handle(
CreateFile(device_path_.value().c_str(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH,
NULL));
if (!device_handle.IsValid()) {
Error(error::kOpenDevice);
return false;
}
STORAGE_PROPERTY_QUERY query = STORAGE_PROPERTY_QUERY();
query.PropertyId = StorageDeviceProperty;
query.QueryType = PropertyStandardQuery;
DWORD bytes_returned;
auto output_buf = base::HeapArray<char>::Uninit(kStorageQueryBufferSize);
BOOL status = DeviceIoControl(
device_handle.Get(), // Device handle.
IOCTL_STORAGE_QUERY_PROPERTY, // Flag to request device properties.
&query, // Query parameters.
sizeof(STORAGE_PROPERTY_QUERY), // query parameters size.
output_buf.data(), // output buffer.
kStorageQueryBufferSize, // Size of buffer.
&bytes_returned, // Number of bytes returned.
// Must not be null.
NULL); // Optional unused overlapped perameter.
if (!status) {
PLOG(ERROR) << "Storage property query failed";
return false;
}
STORAGE_DEVICE_DESCRIPTOR* device_descriptor =
reinterpret_cast<STORAGE_DEVICE_DESCRIPTOR*>(output_buf.data());
return device_descriptor->RemovableMedia == TRUE ||
device_descriptor->BusType == BusTypeUsb;
}
bool ImageWriter::OpenDevice() {
// Windows requires that device files be opened with FILE_FLAG_NO_BUFFERING
// and FILE_FLAG_WRITE_THROUGH. These two flags are not part of base::File.
device_file_ =
base::File(CreateFile(device_path_.value().c_str(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH,
NULL));
return device_file_.IsValid();
}
void ImageWriter::UnmountVolumes(base::OnceClosure continuation) {
if (!InitializeFiles()) {
return;
}
STORAGE_DEVICE_NUMBER sdn = {0};
DWORD bytes_returned;
BOOL status = DeviceIoControl(
device_file_.GetPlatformFile(),
IOCTL_STORAGE_GET_DEVICE_NUMBER,
NULL, // Unused, must be NULL.
0, // Unused, must be 0.
&sdn, // An input buffer to hold the STORAGE_DEVICE_NUMBER
sizeof(sdn), // The size of the input buffer.
&bytes_returned, // the actual number of bytes returned.
NULL); // Unused overlap.
if (!status) {
PLOG(ERROR) << "Unable to get device number.";
return;
}
ULONG device_number = sdn.DeviceNumber;
TCHAR volume_path[MAX_PATH + 1];
HANDLE volume_finder = FindFirstVolume(volume_path, MAX_PATH + 1);
if (volume_finder == INVALID_HANDLE_VALUE) {
return;
}
HANDLE volume_handle;
bool first_volume = true;
bool success = true;
while (first_volume ||
FindNextVolume(volume_finder, volume_path, MAX_PATH + 1)) {
first_volume = false;
size_t length = wcsnlen(volume_path, MAX_PATH + 1);
if (length < 1) {
continue;
}
volume_path[length - 1] = L'\0';
volume_handle = CreateFile(volume_path,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
if (volume_handle == INVALID_HANDLE_VALUE) {
PLOG(ERROR) << "Opening volume handle failed.";
success = false;
break;
}
volume_handles_.push_back(volume_handle);
VOLUME_DISK_EXTENTS disk_extents = {0};
status = DeviceIoControl(volume_handle,
IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
NULL,
0,
&disk_extents,
sizeof(disk_extents),
&bytes_returned,
NULL);
if (!status) {
DWORD error = GetLastError();
if (error == ERROR_MORE_DATA || error == ERROR_INVALID_FUNCTION ||
error == ERROR_NOT_READY) {
continue;
} else {
PLOG(ERROR) << "Unable to get volume disk extents.";
success = false;
break;
}
}
if (disk_extents.NumberOfDiskExtents != 1 ||
disk_extents.Extents[0].DiskNumber != device_number) {
continue;
}
status = DeviceIoControl(volume_handle,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&bytes_returned,
NULL);
if (!status) {
PLOG(ERROR) << "Unable to lock volume.";
success = false;
break;
}
status = DeviceIoControl(volume_handle,
FSCTL_DISMOUNT_VOLUME,
NULL,
0,
NULL,
0,
&bytes_returned,
NULL);
if (!status) {
DWORD error = GetLastError();
if (error != ERROR_NOT_SUPPORTED) {
PLOG(ERROR) << "Unable to dismount volume.";
success = false;
break;
}
}
}
if (volume_finder != INVALID_HANDLE_VALUE) {
FindVolumeClose(volume_finder);
}
if (success)
std::move(continuation).Run();
}
} // namespace image_writer
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