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/*
* libcsync -- a library to sync a directory with another
*
* Copyright (c) 2008-2013 by Andreas Schneider <asn@cryptomilk.org>
* Copyright (c) 2013- by Klaas Freitag <freitag@owncloud.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <memory>
#include "windows.h"
#include "c_private.h"
#include "c_lib.h"
#include "csync.h"
#include "vio/csync_vio_local.h"
#include "common/filesystembase.h"
#include "common/utility.h"
#include <QtCore/QLoggingCategory>
#include "common/vfs.h"
Q_LOGGING_CATEGORY(lcCSyncVIOLocal, "nextcloud.sync.csync.vio_local", QtInfoMsg)
/*
* directory functions
*/
struct csync_vio_handle_t {
WIN32_FIND_DATA ffd;
HANDLE hFind;
int firstFind;
QString path; // Always ends with '\'
};
csync_vio_handle_t *csync_vio_local_opendir(const QString &name) {
QScopedPointer<csync_vio_handle_t> handle(new csync_vio_handle_t{});
// the file wildcard has to be attached
QString dirname = OCC::FileSystem::longWinPath(name + QLatin1String("/*"));
handle->hFind = FindFirstFile(reinterpret_cast<const wchar_t *>(dirname.utf16()), &(handle->ffd));
if (handle->hFind == INVALID_HANDLE_VALUE) {
int retcode = GetLastError();
if( retcode == ERROR_FILE_NOT_FOUND ) {
errno = ENOENT;
} else {
errno = EACCES;
}
return nullptr;
}
handle->firstFind = 1; // Set a flag that there first fileinfo is available.
dirname.chop(1); // remove the *
handle->path = std::move(dirname);
return handle.take();
}
int csync_vio_local_closedir(csync_vio_handle_t *dhandle) {
Q_ASSERT(dhandle);
int rc = -1;
// FindClose returns non-zero on success
if( FindClose(dhandle->hFind) != 0 ) {
rc = 0;
} else {
// error case, set errno
errno = EBADF;
}
delete dhandle;
return rc;
}
static time_t FileTimeToUnixTime(FILETIME *filetime, DWORD *remainder)
{
long long int t = filetime->dwHighDateTime;
t <<= 32;
t += (UINT32)filetime->dwLowDateTime;
t -= 116444736000000000LL;
if (t < 0)
{
if (remainder) *remainder = 9999999 - (-t - 1) % 10000000;
return -1 - ((-t - 1) / 10000000);
}
else
{
if (remainder) *remainder = t % 10000000;
return t / 10000000;
}
}
std::unique_ptr<csync_file_stat_t> csync_vio_local_readdir(csync_vio_handle_t *handle, OCC::Vfs *vfs) {
std::unique_ptr<csync_file_stat_t> file_stat;
DWORD rem;
errno = 0;
// the win32 functions get the first valid entry with the opendir
// thus we must not jump to next entry if it was the first find.
if( handle->firstFind ) {
handle->firstFind = 0;
} else {
if( FindNextFile(handle->hFind, &(handle->ffd)) == 0 ) {
// might be error, check!
int dwError = GetLastError();
if (dwError != ERROR_NO_MORE_FILES) {
qCWarning(lcCSyncVIOLocal, "FindNextFile error %d", dwError);
errno = EACCES; // no more files is fine. Otherwise EACCESS
}
return nullptr;
}
}
auto path = QString::fromWCharArray(handle->ffd.cFileName);
if (path == QLatin1String(".") || path == QLatin1String(".."))
return csync_vio_local_readdir(handle, vfs);
file_stat = std::make_unique<csync_file_stat_t>();
file_stat->path = path.toUtf8();
if (vfs && vfs->statTypeVirtualFile(file_stat.get(), &handle->ffd)) {
// all good
} else if (handle->ffd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
// Detect symlinks, and treat junctions as symlinks too.
if (handle->ffd.dwReserved0 == IO_REPARSE_TAG_SYMLINK
|| handle->ffd.dwReserved0 == IO_REPARSE_TAG_MOUNT_POINT) {
file_stat->type = ItemTypeSoftLink;
} else {
// The SIS and DEDUP reparse points should be treated as
// regular files. We don't know about the other ones yet,
// but will also treat them normally for now.
file_stat->type = ItemTypeFile;
}
} else if (handle->ffd.dwFileAttributes & FILE_ATTRIBUTE_DEVICE
|| handle->ffd.dwFileAttributes & FILE_ATTRIBUTE_OFFLINE
) {
file_stat->type = ItemTypeSkip;
} else if (handle->ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
file_stat->type = ItemTypeDirectory;
} else {
file_stat->type = ItemTypeFile;
}
/* Check for the hidden flag */
if( handle->ffd.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN ) {
file_stat->is_hidden = true;
}
file_stat->size = (handle->ffd.nFileSizeHigh * ((int64_t)(MAXDWORD)+1)) + handle->ffd.nFileSizeLow;
file_stat->modtime = FileTimeToUnixTime(&handle->ffd.ftLastWriteTime, &rem);
// path always ends with '\', by construction
if (csync_vio_local_stat(handle->path + QString::fromWCharArray(handle->ffd.cFileName), file_stat.get()) < 0) {
// Will get excluded by _csync_detect_update.
file_stat->type = ItemTypeSkip;
}
return file_stat;
}
int csync_vio_local_stat(const QString &uri, csync_file_stat_t *buf)
{
/* Almost nothing to do since csync_vio_local_readdir already filled up most of the information
But we still need to fetch the file ID.
Possible optimisation: only fetch the file id when we need it (for new files)
*/
HANDLE h;
BY_HANDLE_FILE_INFORMATION fileInfo;
ULARGE_INTEGER FileIndex;
h = CreateFileW(reinterpret_cast<const wchar_t *>(OCC::FileSystem::longWinPath(uri).utf16()), 0, FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
if( h == INVALID_HANDLE_VALUE ) {
errno = GetLastError();
qCCritical(lcCSyncVIOLocal) << "CreateFileW failed on" << uri << OCC::Utility::formatWinError(errno);
return -1;
}
if(!GetFileInformationByHandle( h, &fileInfo ) ) {
errno = GetLastError();
qCCritical(lcCSyncVIOLocal) << "GetFileInformationByHandle failed on" << uri << OCC::Utility::formatWinError(errno);
CloseHandle(h);
return -1;
}
/* Get the Windows file id as an inode replacement. */
FileIndex.HighPart = fileInfo.nFileIndexHigh;
FileIndex.LowPart = fileInfo.nFileIndexLow;
FileIndex.QuadPart &= 0x0000FFFFFFFFFFFF;
/* printf("Index: %I64i\n", FileIndex.QuadPart); */
buf->inode = FileIndex.QuadPart;
buf->size = (fileInfo.nFileSizeHigh * ((int64_t)(MAXDWORD)+1)) + fileInfo.nFileSizeLow;
DWORD rem;
buf->modtime = FileTimeToUnixTime(&fileInfo.ftLastWriteTime, &rem);
CloseHandle(h);
return 0;
}
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