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

/*  toksvc: a framework-native token broker service      */

/*  Copyright (C) 2020  Z. Gilboa                        */

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

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

#include <psxtypes/psxtypes.h>

#include <ntapi/ntapi.h>

#include <toksvc/toksvc.h>

#include "toksvc_driver_impl.h"

static const uint32_t toks_sd_access_bits[8] = {

	0,

	NT_GENERIC_EXECUTE,

	NT_GENERIC_WRITE,

	NT_GENERIC_WRITE | NT_GENERIC_EXECUTE,

	NT_GENERIC_READ,

	NT_GENERIC_READ  | NT_GENERIC_EXECUTE ,

	NT_GENERIC_READ  | NT_GENERIC_WRITE,

	NT_GENERIC_READ  | NT_GENERIC_WRITE | NT_GENERIC_EXECUTE

};

static nt_sd * toks_fsfile_sd(

	nt_sd_common_buffer *	sd,

	uint32_t		mode)

{

	uint32_t		access_owner;

	uint32_t		access_group;

	uint32_t		access_other;

	uint32_t		access_admin;

	nt_sid *		admin_sid;

	access_owner  = (((mode & 0700) >> 6) == 7)

		? NT_GENERIC_ALL | NT_SEC_SPECIFIC_RIGHTS_ALL

		: toks_sd_access_bits[(mode & 0700) >> 6]

			| NT_SEC_STANDARD_RIGHTS_ALL;

	access_group  = toks_sd_access_bits[(mode & 0070) >> 3];

	access_group |= NT_SEC_READ_CONTROL|NT_FILE_READ_ATTRIBUTES;

	access_other  = toks_sd_access_bits[(mode & 0007) >> 0];

	access_other |= NT_SEC_READ_CONTROL|NT_FILE_READ_ATTRIBUTES;

	admin_sid    = 0;

	access_admin = access_owner;

	ntapi->acl_init_common_descriptor(

		sd,0,0,

		0,admin_sid,

		access_owner,access_group,access_other,

		access_admin,access_owner,

		0);

	return &sd->sd;

}

static int32_t toks_open(

	void **		hfile,

	void *		hat,

	const char *	arg,

	nt_sd *		sd,

	uint32_t	attr,

	uint32_t	options,

	uint32_t	disposition,

	bool		fprivate)

{

	int32_t						status;

	nt_oa						oa;

	nt_iosb						iosb;

	nt_unicode_string				path;

	nt_unicode_conversion_params_utf8_to_utf16	params = {0,0,0,0,0,0,0,0,0};

	wchar16_t					buffer[4096];

	wchar16_t *					wch;

	size_t						nbytes;

	uint32_t					access;

	nt_large_integer				alloc_size;

	/* utf-8 --> utf-16 */

	params.src		= (const unsigned char *)arg;

	params.src_size_in_bytes= ntapi->tt_string_null_offset_multibyte(arg);

	params.dst		= buffer;

	params.dst_size_in_bytes= sizeof(buffer);

	if ((status = ntapi->uc_convert_unicode_stream_utf8_to_utf16(&params)))

		return status;

	/* convenience */

	for (wch=buffer, nbytes=params.bytes_written; nbytes; ) {

		if (*wch == '/')

			*wch = '\\';

		nbytes -= sizeof(wchar16_t);

		wch++;

	}

	/* path */

	path.maxlen = 0;

	path.strlen = (uint16_t)params.bytes_written;

	path.buffer = buffer;

	/* oa */

	oa.len      = sizeof(nt_oa);

	oa.root_dir = (buffer[0]=='\\') ? 0 : hat;

	oa.obj_name = &pat;;

	oa.obj_attr = fprivate ? 0 : NT_OBJ_INHERIT;

	oa.sec_desc = sd;

	oa.sec_qos  = 0;

	/* alloc_size (always zero) */

	alloc_size.quad = 0;

	/* access */

	access  = NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_DATA;

	access |= (disposition == NT_FILE_OPEN_IF) ? NT_FILE_WRITE_DATA : 0;

	/* open/create */

	return ntapi->zw_create_file(

		hfile,

		access,&oa,&iosb,&alloc_size,attr,

		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE | NT_FILE_SHARE_DELETE,

		disposition,

		options | NT_FILE_SYNCHRONOUS_IO_ALERT,

		0,0);

}

static int32_t toks_open_volume(

	void **		hfile,

	void *		hat,

	const char *	arg,

	nt_sd *		sd,

	uint32_t	attr,

	uint32_t	options,

	uint32_t	disposition,

	bool		fprivate)

{

	int32_t   status;

	void *    hvolume = 0;

	wchar16_t drive   = arg[0];

	if ((arg[1]==':') && ((arg[2]=='\\') || (arg[2]=='/'))) {

		if ((status = ntapi->tt_get_dos_drive_root_handle(

				&hvolume,drive)))

			return status;

		hat = hvolume;

		arg = &arg[3];

	}

	status = toks_open(

		hfile,hat,arg,sd,attr,

		options,disposition,

		fprivate);

	if (hvolume)

		ntapi->zw_close(hvolume);

	return status;

}

int32_t toks_open_file(void ** hfile, void * hat, const char * arg, bool fprivate)

{

	return toks_open_volume(

		hfile,hat,arg,0,

		NT_FILE_ATTRIBUTE_NORMAL,

		NT_FILE_NON_DIRECTORY_FILE,

		NT_FILE_OPEN,

		fprivate);

}

int32_t toks_open_log_file(void ** hfile, void * hat, const char * arg, bool fprivate)

{

	int32_t                 status;

	nt_iosb                 iosb;

	nt_fsi                  fsi;

	nt_fpi                  fpi;

	nt_sd_common_buffer     sd;

	if ((status = toks_open_volume(

			hfile,hat,arg,

			toks_fsfile_sd(&sd,0644),

			NT_FILE_ATTRIBUTE_NORMAL,

			NT_FILE_NON_DIRECTORY_FILE,

			NT_FILE_OPEN_IF,

			fprivate)))

		return status;

	status = ntapi->zw_query_information_file(

		*hfile,&iosb,

		&fsi,sizeof(fsi),

		NT_FILE_STANDARD_INFORMATION);

	if (status) {

		ntapi->zw_close(*hfile);

		return status;

	}

	fpi.current_byte_offset.quad = fsi.end_of_file.quad;

	status = ntapi->zw_set_information_file(

		*hfile,&iosb,

		&fpi,sizeof(fpi),

		NT_FILE_POSITION_INFORMATION);

	if (status) {

		ntapi->zw_close(*hfile);

		return status;

	}

	return NT_STATUS_SUCCESS;

}

int32_t toks_open_dir(void ** hfile, void * hat, const char * arg, bool fprivate)

{

	return toks_open_volume(

		hfile,hat,arg,0,

		NT_FILE_ATTRIBUTE_DIRECTORY,

		NT_FILE_DIRECTORY_FILE,

		NT_FILE_OPEN,

		fprivate);

}