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--2016  Z. Gilboa                 */
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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	uintptr_t *	buffer,
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	__in	uint32_t	buffer_size,
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	__in	uint32_t	desired_access,
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	__in	uint32_t	open_options,
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	__out	int32_t *	type)
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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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	(void)type;
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	path = (nt_unicode_string *)buffer;
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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 ((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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	for (root=&root[8]; (root
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		root++;
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	if ((uint16_t)((++root - path->buffer) * sizeof(uint16_t)) == path->strlen)
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		return NT_STATUS_MORE_PROCESSING_REQUIRED;
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	/* physical parent directory path */
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	for (; (wch>root) && (wch[-1]!='\\'); )
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		wch--;
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	path->strlen = sizeof(uint16_t) * (uint16_t)(wch-path->buffer);
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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 = 0;
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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,
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		&iosb,
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		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE,
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		open_options | NT_FILE_DIRECTORY_FILE);
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}