Blame src/ldso/pe_open_physical_parent_directory.c

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/*****************************************************************************/
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/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
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/*  Copyright (C) 2013--2017  Z. Gilboa                                      */
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/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
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/*****************************************************************************/
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#include <psxtypes/psxtypes.h>
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#include <pemagine/pemagine.h>
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#include <pemagine/pe_structs.h>
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#include "pe_os.h"
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int32_t pe_open_physical_parent_directory(
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	__out	void **		hparent,
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	__in	void *		href,
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	__out	uintptr_t *	buffer,
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	__in	uint32_t	bufsize,
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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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{
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	int32_t			status;
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	struct os_oa		oa;
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	struct os_iosb		iosb;
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	wchar16_t *		wch;
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	wchar16_t *		root;
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	struct pe_unicode_str *	path;
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	uint32_t		len;
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	int			mup;
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	void *			hntdll;
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	os_zw_query_object *	zw_query_object;
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	os_zw_open_file *	zw_open_file;
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	/* init */
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	path = (struct pe_unicode_str *)buffer;
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	if (!(hntdll = pe_get_ntdll_module_handle()))
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		return OS_STATUS_INTERNAL_ERROR;
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	if (!(zw_query_object = (os_zw_query_object *)pe_get_procedure_address(
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			hntdll,"ZwQueryObject")))
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		return OS_STATUS_INTERNAL_ERROR;
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	if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(
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			hntdll,"ZwOpenFile")))
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		return OS_STATUS_INTERNAL_ERROR;
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	/* native path of base directory */
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	if ((status = zw_query_object(
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			href,
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			OS_OBJECT_NAME_INFORMATION,
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			path,
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			bufsize,
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			&len)))
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		return status;
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	/* integrity */
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	if (len == sizeof(struct pe_unicode_str))
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		return OS_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 OS_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 OS_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 OS_STATUS_INTERNAL_ERROR;
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	if (&root[1] == wch)
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		return OS_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(struct os_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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		: OS_SEC_SYNCHRONIZE | OS_FILE_READ_ATTRIBUTES | OS_FILE_READ_ACCESS;
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	/* open parent directory */
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	return 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 | OS_FILE_DIRECTORY_FILE);
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}