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/* $Id: ntunlink.c 3504 2021-12-15 22:50:14Z bird $ */
/** @file
* MSC + NT unlink and variations.
*/
/*
* Copyright (c) 2005-2017 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Alternatively, the content of this file may be used under the terms of the
* GPL version 2 or later, or LGPL version 2.1 or later.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "ntunlink.h"
#include "ntstuff.h"
#include "nthlp.h"
static MY_NTSTATUS birdMakeWritable(HANDLE hRoot, MY_UNICODE_STRING *pNtPath)
{
MY_NTSTATUS rcNt;
HANDLE hFile;
rcNt = birdOpenFileUniStr(hRoot,
pNtPath,
FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | SYNCHRONIZE,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_OPEN_FOR_BACKUP_INTENT | FILE_SYNCHRONOUS_IO_NONALERT,
OBJ_CASE_INSENSITIVE,
&hFile);
if (MY_NT_SUCCESS(rcNt))
{
MY_FILE_BASIC_INFORMATION BasicInfo;
MY_IO_STATUS_BLOCK Ios;
DWORD dwAttr;
Ios.Information = -1;
Ios.u.Status = -1;
memset(&BasicInfo, 0, sizeof(BasicInfo));
rcNt = g_pfnNtQueryInformationFile(hFile, &Ios, &BasicInfo, sizeof(BasicInfo), MyFileBasicInformation);
if (MY_NT_SUCCESS(rcNt) && MY_NT_SUCCESS(Ios.u.Status) && BasicInfo.FileAttributes != FILE_ATTRIBUTE_READONLY)
dwAttr = BasicInfo.FileAttributes & ~FILE_ATTRIBUTE_READONLY;
else
dwAttr = FILE_ATTRIBUTE_NORMAL;
memset(&BasicInfo, 0, sizeof(BasicInfo));
BasicInfo.FileAttributes = dwAttr;
Ios.Information = -1;
Ios.u.Status = -1;
rcNt = g_pfnNtSetInformationFile(hFile, &Ios, &BasicInfo, sizeof(BasicInfo), MyFileBasicInformation);
birdCloseFile(hFile);
}
return rcNt;
}
static int birdUnlinkInternal(HANDLE hRoot, const char *pszFile, const wchar_t *pwszFile, int fReadOnlyToo, int fFast)
{
MY_UNICODE_STRING NtPath;
int rc;
if (hRoot == INVALID_HANDLE_VALUE)
hRoot = NULL;
if (hRoot == NULL)
{
if (pwszFile)
rc = birdDosToNtPathW(pwszFile, &NtPath);
else
rc = birdDosToNtPath(pszFile, &NtPath);
}
else
{
if (pwszFile)
rc = birdDosToRelativeNtPathW(pwszFile, &NtPath);
else
rc = birdDosToRelativeNtPath(pszFile, &NtPath);
}
if (rc == 0)
{
MY_NTSTATUS rcNt;
if (fFast)
{
/* This uses FILE_DELETE_ON_CLOSE. Probably only suitable when in a hurry... */
MY_OBJECT_ATTRIBUTES ObjAttr;
MyInitializeObjectAttributes(&ObjAttr, &NtPath, OBJ_CASE_INSENSITIVE, hRoot, NULL /*pSecAttr*/);
rcNt = g_pfnNtDeleteFile(&ObjAttr);
/* In case some file system does things differently than NTFS. */
if (rcNt == STATUS_CANNOT_DELETE && fReadOnlyToo)
{
birdMakeWritable(hRoot, &NtPath);
rcNt = g_pfnNtDeleteFile(&ObjAttr);
}
}
else
{
/* Use the set information stuff. Probably more reliable. */
HANDLE hFile;
for (;;)
{
rcNt = birdOpenFileUniStr(hRoot,
&NtPath,
DELETE | SYNCHRONIZE,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_OPEN_FOR_BACKUP_INTENT | FILE_OPEN_REPARSE_POINT,
OBJ_CASE_INSENSITIVE,
&hFile);
if (MY_NT_SUCCESS(rcNt))
{
MY_FILE_DISPOSITION_INFORMATION DispInfo;
MY_IO_STATUS_BLOCK Ios;
DispInfo.DeleteFile = TRUE;
Ios.Information = -1;
Ios.u.Status = -1;
rcNt = g_pfnNtSetInformationFile(hFile, &Ios, &DispInfo, sizeof(DispInfo), MyFileDispositionInformation);
birdCloseFile(hFile);
}
if (rcNt != STATUS_CANNOT_DELETE || !fReadOnlyToo)
break;
fReadOnlyToo = 0;
birdMakeWritable(hRoot, &NtPath);
}
}
birdFreeNtPath(&NtPath);
if (MY_NT_SUCCESS(rcNt))
rc = 0;
else
rc = birdSetErrnoFromNt(rcNt);
}
return rc;
}
int birdUnlink(const char *pszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, pszFile, NULL /*pwszFile*/, 0 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkW(const wchar_t *pwszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, NULL /*pwszFile*/, pwszFile, 0 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkEx(void *hRoot, const char *pszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, pszFile, NULL /*pwszFile*/, 0 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkExW(void *hRoot, const wchar_t *pwszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, NULL /*pszFile*/, pwszFile, 0 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkForced(const char *pszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, pszFile, NULL /*pwszFile*/, 1 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkForcedW(const wchar_t *pwszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, NULL /*pszFile*/, pwszFile, 1 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkForcedEx(void *hRoot, const char *pszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, pszFile, NULL /*pwszFile*/, 1 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkForcedExW(void *hRoot, const wchar_t *pwszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, NULL /*pszFile*/, pwszFile, 1 /*fReadOnlyToo*/, 0 /*fFast*/);
}
int birdUnlinkForcedFast(const char *pszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, pszFile, NULL /*pwszFile*/, 1 /*fReadOnlyToo*/, 1 /*fFast*/);
}
int birdUnlinkForcedFastW(const wchar_t *pwszFile)
{
return birdUnlinkInternal(NULL /*hRoot*/, NULL /*pszFile*/, pwszFile, 1 /*fReadOnlyToo*/, 1 /*fFast*/);
}
int birdUnlinkForcedFastEx(void *hRoot, const char *pszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, pszFile, NULL /*pwszFile*/, 1 /*fReadOnlyToo*/, 1 /*fFast*/);
}
int birdUnlinkForcedFastExW(void *hRoot, const wchar_t *pwszFile)
{
return birdUnlinkInternal((HANDLE)hRoot, NULL /*pszFile*/, pwszFile, 1 /*fReadOnlyToo*/, 1 /*fFast*/);
}
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