/********************************************************/

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2016  Z. Gilboa                 */

/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */

/********************************************************/

#include <ntapi/ntapi.h>

#include <ntapi/nt_file.h>

#include <ntapi/nt_fsctl.h>

#include <ntapi/nt_mount.h>

#include <ntapi/nt_istat.h>

#include "ntapi_impl.h"

int32_t __stdcall __ntapi_tt_istat(

	__in	void *			hfile,

	__in	void *			hroot	__optional,

	__in	nt_unicode_string *	path,

	__out	nt_istat *		istat,

	__out	uintptr_t *		buffer,

	__in	uint32_t		buffer_size,

	__in	uint32_t		open_options,

	__in	uint32_t		flags)

{

	int32_t			status;

	nt_oa			oa;

	nt_iosb			iosb;

	nt_unicode_string *	sdev;

	wchar16_t *		wch;

	wchar16_t *		wch_mark;

	/* validaton */

	if (!hfile && !path)

		return NT_STATUS_INVALID_HANDLE;

	/* hfile */

	if (!hfile) {

		/* oa */

		oa.len = sizeof(nt_oa);

		oa.root_dir = hroot;

		oa.obj_name = path;

		oa.obj_attr = 0;

		oa.sec_desc = 0;

		oa.sec_qos = 0;

		/* open file/folder */

		if ((status = __ntapi->zw_open_file(

				&hfile,

				NT_SEC_SYNCHRONIZE

					| NT_FILE_READ_ATTRIBUTES

					| NT_FILE_READ_ACCESS,

				&oa,

				&iosb,

				NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE,

				open_options | NT_FILE_SYNCHRONOUS_IO_ALERT)))

			return status;

		istat->flags_out = NT_STAT_NEW_HANDLE;

	}

	istat->hfile    = hfile;

	istat->flags_in = flags;

	/* file index number */

	if ((status = __ntapi->zw_query_information_file(

			hfile,

			&iosb,

			&istat->fii,

			sizeof(istat->fii),

			NT_FILE_INTERNAL_INFORMATION)))

		return status;

	/* attributes & reparse tag information */

	if ((status = __ntapi->zw_query_information_file(

			hfile,

			&iosb,

			&istat->ftagi,

			sizeof(istat->ftagi),

			NT_FILE_ATTRIBUTE_TAG_INFORMATION)))

		return status;

	/* system-unique device name */

	if ((status = __ntapi->zw_query_object(

			hfile,

			NT_OBJECT_NAME_INFORMATION,

			buffer,

			buffer_size,

			(uint32_t *)&iosb.info)))

		return status;

	sdev = (nt_unicode_string *)buffer;

	wch  = sdev->buffer;

	if (sdev->strlen < __DEVICE_PATH_PREFIX_LEN)

		return NT_STATUS_INVALID_HANDLE;

	if ((wch[0] != '\\')

			|| (wch[1] != 'D')

			|| (wch[2] != 'e')

			|| (wch[3] != 'v')

			|| (wch[4] != 'i')

			|| (wch[5] != 'c')

			|| (wch[6] != 'e')

			|| (wch[7] != '\\'))

		return NT_STATUS_INVALID_HANDLE;

	wch_mark = &wch[8];

	wch      = wch_mark;

	while (*wch != '\\')

		wch++;

	istat->dev_name_strlen = (uint16_t)((wch - sdev->buffer) * sizeof(uint16_t));

	istat->dev_name_hash   = __ntapi->tt_buffer_crc32(

		__DEVICE_PATH_PREFIX_HASH,

		wch_mark,

		(uintptr_t)wch - (uintptr_t)wch_mark);

	return status;

}

int32_t __stdcall __ntapi_tt_validate_fs_handle(

	__in	void *		hfile,

	__in	uint32_t	dev_name_hash,

	__in	nt_fii		fii,

	__out	uintptr_t *	buffer,

	__in	uint32_t	buffer_size)

{

	int32_t		status;

	nt_istat	istat;

	status = __ntapi->tt_istat(

		hfile,

		(void *)0,

		(nt_unicode_string *)0,

		&istat,

		buffer,

		buffer_size,

		0,

		NT_ISTAT_DEFAULT);

	if (status) return status;

	if (istat.fii.index_number.quad != fii.index_number.quad)

		return NT_STATUS_CONTEXT_MISMATCH;

	else if (istat.dev_name_hash != dev_name_hash)

		return NT_STATUS_CONTEXT_MISMATCH;

	return NT_STATUS_SUCCESS;

}