/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

#ifndef _RPC_RPC_MSG_H
#define _RPC_RPC_MSG_H

#include <rpc/clnt.h>
/*
 * rpc_msg.h
 * rpc message definition
 */

#ifdef __cplusplus
extern "C" {
#endif

#define RPC_MSG_VERSION         ((uint32_t)2)
#define RPC_SERVICE_PORT        ((ushort_t)2048)

/*
 * Bottom up definition of an rpc message.
 * NOTE: call and reply use the same overall stuct but
 * different parts of unions within it.
 */

enum msg_type {
        CALL = 0,
        REPLY = 1
};

enum reply_stat {
        MSG_ACCEPTED = 0,
        MSG_DENIED = 1
};

enum accept_stat {
        SUCCESS = 0,
        PROG_UNAVAIL = 1,
        PROG_MISMATCH = 2,
        PROC_UNAVAIL = 3,
        GARBAGE_ARGS = 4,
        SYSTEM_ERR = 5
};

enum reject_stat {
        RPC_MISMATCH = 0,
        AUTH_ERROR = 1
};

/*
 * Reply part of an rpc exchange
 */

/*
 * Reply to an rpc request that was accepted by the server.
 * Note: there could be an error even though the request was
 * accepted.
 */
struct accepted_reply {
        struct opaque_auth      ar_verf;
        enum accept_stat        ar_stat;
        union {
                struct {
                        rpcvers_t low;
                        rpcvers_t high;
                } AR_versions;
                struct {
                        caddr_t where;
                        xdrproc_t proc;
                } AR_results;
                /* and many other null cases */
        } ru;
#define ar_results      ru.AR_results
#define ar_vers         ru.AR_versions
};

/*
 * Reply to an rpc request that was rejected by the server.
 */
struct rejected_reply {
        enum reject_stat rj_stat;
        union {
                struct {
                        rpcvers_t low;
                        rpcvers_t high;
                } RJ_versions;
                enum auth_stat RJ_why;  /* why authentication did not work */
        } ru;
#define rj_vers ru.RJ_versions
#define rj_why  ru.RJ_why
};

/*
 * Body of a reply to an rpc request.
 */
struct reply_body {
        enum reply_stat rp_stat;
        union {
                struct accepted_reply RP_ar;
                struct rejected_reply RP_dr;
        } ru;
#define rp_acpt ru.RP_ar
#define rp_rjct ru.RP_dr
};

/*
 * Body of an rpc request call.
 */
struct call_body {
        rpcvers_t cb_rpcvers;   /* must be equal to two */
        rpcprog_t cb_prog;
        rpcvers_t cb_vers;
        rpcproc_t cb_proc;
        struct opaque_auth cb_cred;
        struct opaque_auth cb_verf; /* protocol specific - provided by client */
};

/*
 * The rpc message
 */
struct rpc_msg {
        uint32_t                rm_xid;
        enum msg_type           rm_direction;
        union {
                struct call_body RM_cmb;
                struct reply_body RM_rmb;
        } ru;
#define rm_call         ru.RM_cmb
#define rm_reply        ru.RM_rmb
};
#define acpted_rply     ru.RM_rmb.ru.RP_ar
#define rjcted_rply     ru.RM_rmb.ru.RP_dr


/*
 * XDR routine to handle a rpc message.
 * xdr_callmsg(xdrs, cmsg)
 *      XDR *xdrs;
 *      struct rpc_msg *cmsg;
 */
#ifdef __STDC__
extern bool_t   xdr_callmsg(XDR *, struct rpc_msg *);
#else
extern bool_t   xdr_callmsg();
#endif


/*
 * XDR routine to pre-serialize the static part of a rpc message.
 * xdr_callhdr(xdrs, cmsg)
 *      XDR *xdrs;
 *      struct rpc_msg *cmsg;
 */
#ifdef __STDC__
extern bool_t   xdr_callhdr(XDR *, struct rpc_msg *);
#else
extern bool_t   xdr_callhdr();
#endif


/*
 * XDR routine to handle a rpc reply.
 * xdr_replymsg(xdrs, rmsg)
 *      XDR *xdrs;
 *      struct rpc_msg *rmsg;
 *
 * xdr_accepted_reply(xdrs, ar)
 *      XDR *xdrs;
 *      const struct accepted_reply *ar;
 *
 * xdr_rejected_reply(xdrs, rr)
 *      XDR *xdrs;
 *      const struct rejected_reply *rr;
 */
#ifdef __STDC__
extern bool_t   xdr_replymsg(XDR *, struct rpc_msg *);
extern bool_t   xdr_accepted_reply(XDR *, struct accepted_reply *);
extern bool_t   xdr_rejected_reply(XDR *, struct rejected_reply *);
#else
extern bool_t   xdr_replymsg();
extern bool_t   xdr_accepted_reply();
extern bool_t   xdr_rejected_reply();
#endif


#ifdef _KERNEL
/*
 * Fills in the error part of a reply message.
 * _seterr_reply(msg, error)
 *      struct rpc_msg *msg;
 *      struct rpc_err *error;
 */
#ifdef __STDC__
extern void     _seterr_reply(struct rpc_msg *, struct rpc_err *);
#else
extern void     _seterr_reply();
#endif
#else
/*
 * Fills in the error part of a reply message.
 * __seterr_reply(msg, error)
 *      struct rpc_msg *msg;
 *      struct rpc_err *error;
 */
#ifdef __STDC__
extern void     __seterr_reply(struct rpc_msg *, struct rpc_err *);
#else
extern void     __seterr_reply();
#endif
#endif

#ifdef _KERNEL
/*
 * Frees any verifier that xdr_replymsg() (DECODE) allocated.
 */
bool_t xdr_rpc_free_verifier(register XDR *xdrs, register struct rpc_msg *msg);

#endif

#ifdef __cplusplus
}
#endif

#endif  /* _RPC_RPC_MSG_H */