/*      $OpenBSD: rpc_msg.h,v 1.7 2014/10/29 04:34:21 guenther Exp $    */
/*      $NetBSD: rpc_msg.h,v 1.5 1995/04/29 05:28:00 cgd Exp $  */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the "Oracle America, Inc." 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 THE COPYRIGHT HOLDERS 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
 *   COPYRIGHT HOLDER 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.
 *
 *      from: @(#)rpc_msg.h 1.7 86/07/16 SMI
 *      @(#)rpc_msg.h   2.1 88/07/29 4.0 RPCSRC
 */

/*
 * rpc_msg.h
 * rpc message definition
 */

#ifndef _RPC_RPCMSG_H
#define _RPC_RPCMSG_H

#define RPC_MSG_VERSION         ((unsigned long) 2)
#define RPC_SERVICE_PORT        ((unsigned short) 2048)

/*
 * Bottom up definition of an rpc message.
 * NOTE: call and reply use the same overall struct 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 {
                        u_int32_t low;
                        u_int32_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 {
                        u_int32_t low;
                        u_int32_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 {
        u_int32_t cb_rpcvers;   /* must be equal to two */
        u_int32_t cb_prog;
        u_int32_t cb_vers;
        u_int32_t cb_proc;
        struct opaque_auth cb_cred;
        struct opaque_auth cb_verf; /* protocol specific - provided by client */
};

/*
 * The rpc message
 */
struct rpc_msg {
        u_int32_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

__BEGIN_DECLS
/*
 * XDR routine to handle a rpc message.
 * xdr_callmsg(xdrs, cmsg)
 *      XDR *xdrs;
 *      struct rpc_msg *cmsg;
 */
extern bool_t   xdr_callmsg(XDR *, struct rpc_msg *);

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

/*
 * XDR routine to handle a rpc reply.
 * xdr_replymsg(xdrs, rmsg)
 *      XDR *xdrs;
 *      struct rpc_msg *rmsg;
 */
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 *);

/*
 * Fills in the error part of a reply message.
 * _seterr_reply(msg, error)
 *      struct rpc_msg *msg;
 *      struct rpc_err *error;
 */
extern void     _seterr_reply(struct rpc_msg *, struct rpc_err *);
__END_DECLS

#endif /* !_RPC_RPCMSG_H */