Blame src/fs/ntapi_tt_open_physical_parent_directory.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2021  SysDeer Technologies, LLC */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <ntapi/ntapi.h>
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#include <ntapi/nt_file.h>
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#include "ntapi_impl.h"
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int32_t __stdcall __ntapi_tt_open_physical_parent_directory(
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	__out	void **		hparent,
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	__in	void *		hdir,
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	__out	void *		buffer,
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	__in	uint32_t	buffer_size,
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	__in	uint32_t	oattr,
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	__in	uint32_t	desired_access,
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	__in	uint32_t	share_access,
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	__in	uint32_t	open_options,
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	__out	int *		reserved)
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{
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	int32_t			status;
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	nt_oa			oa;
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	nt_iosb			iosb;
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	wchar16_t *		wch;
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	wchar16_t *		root;
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	nt_unicode_string *	path;
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	uint32_t		len;
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	int			mup;
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	uintptr_t		addr;
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	uintptr_t		addr_cap;
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	(void)reserved;
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	addr     = (uintptr_t)buffer;
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	addr_cap = addr + buffer_size;
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	addr += 0xf;
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	addr |= 0xf;
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	addr ^= 0xf;
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	path        = (nt_unicode_string *)addr;
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	buffer_size = addr_cap - addr;
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	if ((status = __ntapi->zw_query_object(
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			hdir,
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			NT_OBJECT_NAME_INFORMATION,
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			path,
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			buffer_size,
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			&len)))
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		return status;
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	/* integrity */
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	if (len == sizeof(nt_unicode_string))
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		return NT_STATUS_BAD_FILE_TYPE;
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	/* device root directory */
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	root = path->buffer;
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	wch  = path->buffer + (path->strlen / sizeof(uint16_t));
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	if ((wch < &root[8])
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			|| (root[0] != '\\')
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			|| (root[1] != 'D') || (root[2] != 'e')
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			|| (root[3] != 'v') || (root[4] != 'i')
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			|| (root[5] != 'c') || (root[6] != 'e')
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			|| (root[7] != '\\'))
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		return NT_STATUS_INTERNAL_ERROR;
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	mup = (wch > &root[11])
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		&& (root[8]=='M')
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		&& (root[9]=='u')
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		&& (root[10]=='p')
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		&& (root[11]=='\\');
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	root = mup ? &root[12] : &root[8];
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	for (; (root
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		root++;
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	if (root == wch)
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		return NT_STATUS_INTERNAL_ERROR;
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	if (mup)
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		for (root++; (root
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			root++;
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	if (root == wch)
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		return NT_STATUS_INTERNAL_ERROR;
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	if (&root[1] == wch)
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		return NT_STATUS_MORE_PROCESSING_REQUIRED;
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	if (wch[-1] == '\\')
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		wch--;
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	/* physical parent directory path */
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	for (root++; (wch>=root) && (wch[-1]!='\\'); )
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		wch--;
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	path->strlen = (uint16_t)(wch - path->buffer) * sizeof(uint16_t);
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	path->maxlen = 0;
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	/* oa */
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	oa.len = sizeof(nt_oa);
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	oa.root_dir = 0;
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	oa.obj_name = path;
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	oa.obj_attr = oattr,
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	oa.sec_desc = 0;
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	oa.sec_qos  = 0;
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	/* default access */
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	desired_access = desired_access
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		? desired_access
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		: NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_ACCESS;
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	/* open parent directory */
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	return __ntapi->zw_open_file(
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		hparent,
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		desired_access,
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		&oa,&iosb,
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		share_access,
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		open_options | NT_FILE_DIRECTORY_FILE);
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}