/*************************************************************************
* (C) 2015 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: aitrpc_pkt.h,v 1.4 2024/03/20 17:32:30 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2024
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#ifndef __AITRPC_PKT_H
#define __AITRPC_PKT_H


#include <sys/types.h>
#include <elwix.h>


#define RPC_VERSION		9
#define RPC_DEFPORT		2611

/* Additional ELWIX RPC supporting protocols */

#ifndef SOCK_STREAM
#define SOCK_STREAM		1	/* stream socket */
#endif
#ifndef SOCK_DGRAM
#define SOCK_DGRAM		2	/* datagram socket */
#endif
#ifndef SOCK_RAW
#define SOCK_RAW		3	/* raw-protocol interface */
#endif
#define SOCK_BPF		4	/* ethernet interface */
#define SOCK_EXT		5	/* bi-directional pipe interface */

/* RPC IP protocol number */

#define IPPROTO_ERPC		162

/* RPC call request flags */

#define RPC_REPLY		0x0
#define RPC_NOREPLY		0x1

/* RPC call I/O direction */

#define RPC_REQ			0x1
#define RPC_ACK			0x2
#define RPC_IPC			0x4

/* RPC builtin registed calls */

#define CALL_TAG_MAX		65535

#define CALL_SRVPING		65534

#define CALL_SRVSHUTDOWN	65533
#define CALL_SRVCLIENTS		65532
#define CALL_SRVCALLS		65531
#define CALL_SRVSESSIONS	65530

#define CALL_BLOBSHUTDOWN	65529
#define CALL_BLOBCLIENTS	65528
#define CALL_BLOBVARS		65527

/* RPC signals */

#define SIGFBLOB		54


/* RPC session identification */

typedef struct {
#if BYTE_ORDER == LITTLE_ENDIAN
	uint16_t	sess_instance:8;
	uint16_t	sess_version:8;
#endif
#if BYTE_ORDER == BIG_ENDIAN
	uint16_t	sess_version:8;
	uint16_t	sess_instance:8;
#endif
} __attribute__((packed)) rpc_sess_t;	/* size == 2 bytes */

/* Network RPC packet - Header */

struct tagRPCCall {
	rpc_sess_t	call_session;

	uint32_t	call_len;
	uint32_t	call_seq;
	uint16_t	call_crc;

	union {
		struct {
			uint64_t	flags;
		}	call_req;
		struct {
			int32_t		ret;
			int32_t		eno;
		}	call_rep;
	};

	uint8_t		call_io;
	uint16_t	call_tag;
	uint8_t		call_argc;
	ait_val_t	call_argv[0];
} __attribute__((packed));	/* size == 20 bytes */
#define RPC_CHK_NOREPLY(x)	(ntohl((u_long) (x)->call_req.flags) & RPC_NOREPLY)
#define RPC_SET_ERRNO(x, _v)	((x)->call_rep.eno = (int32_t) htonl((_v)))
#define RPC_SET_RETURN(x, _v)	((x)->call_rep.ret = (int32_t) htonl((_v)))

/* Network BLOB packet - Header */

struct tagBLOBHdr {
	rpc_sess_t	hdr_session;
	uint8_t		hdr_cmd;
	uint32_t	hdr_var;
	uint32_t	hdr_len;
	uint32_t	hdr_ret;
	uint8_t		hdr_pad;
} __attribute__((packed));			/* size == 16 bytes */
#define RPC_SET_BLOB_RET(x, _v)	((x)->hdr_ret = (uint32_t) htonl((_v)))

/* RPC BLOB types */

typedef enum {
	ok, error, no, 				/* for blob reply */
	get, set, unset				/* for blob request */
} blob_cmd_type_t;


#endif