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/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if defined(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";*/

/*static char *sccsid = "from: @(#)rpc_prot.c   2.3 88/08/07 4.0 RPCSRC";*/

static char *rcsid = "$FreeBSD: src/lib/libc/rpc/rpc_prot.c,v 1.8 1999/08/28 00:00:46 peter Exp $";

#endif

/*

 * rpc_prot.c

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * This set of routines implements the rpc message definition,

 * its serializer and some common rpc utility routines.

 * The routines are meant for various implementations of rpc -

 * they are NOT for the rpc client or rpc service implementations!

 * Because authentication stuff is easy and is part of rpc, the opaque

 * routines are also in this program.

 */

#include <sys/param.h>

#include <rpc/rpc.h>

/* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */

struct opaque_auth _null_auth;

/*

 * XDR an opaque authentication struct

 * (see auth.h)

 */

bool_t

xdr_opaque_auth(xdrs, ap)

        register XDR *xdrs;

        register struct opaque_auth *ap;

{

        if (xdr_enum(xdrs, &(ap->oa_flavor)))

                return (xdr_bytes(xdrs, &ap->oa_base,

                        &ap->oa_length, MAX_AUTH_BYTES));

        return (FALSE);

}

/*

 * XDR a DES block

 */

bool_t

xdr_des_block(xdrs, blkp)

        register XDR *xdrs;

        register des_block *blkp;

{

        return (xdr_opaque(xdrs, (caddr_t)blkp, sizeof(des_block)));

}

/* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */

/*

 * XDR the MSG_ACCEPTED part of a reply message union

 */

bool_t

xdr_accepted_reply(xdrs, ar)

        register XDR *xdrs;

        register struct accepted_reply *ar;

{

        /* personalized union, rather than calling xdr_union */

        if (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))

                return (FALSE);

        if (! xdr_enum(xdrs, (enum_t *)&(ar->ar_stat)))

                return (FALSE);

        switch (ar->ar_stat) {

        case SUCCESS:

                return ((*(ar->ar_results.proc))(xdrs, ar->ar_results.where));

        case PROG_MISMATCH:

                if (! xdr_u_int32_t(xdrs, &(ar->ar_vers.low)))

                        return (FALSE);

                return (xdr_u_int32_t(xdrs, &(ar->ar_vers.high)));

        default:

                break;

        }

        return (TRUE);  /* TRUE => open ended set of problems */

}

/*

 * XDR the MSG_DENIED part of a reply message union

 */

bool_t

xdr_rejected_reply(xdrs, rr)

        register XDR *xdrs;

        register struct rejected_reply *rr;

{

        /* personalized union, rather than calling xdr_union */

        if (! xdr_enum(xdrs, (enum_t *)&(rr->rj_stat)))

                return (FALSE);

        switch (rr->rj_stat) {

        case RPC_MISMATCH:

                if (! xdr_u_int32_t(xdrs, &(rr->rj_vers.low)))

                        return (FALSE);

                return (xdr_u_int32_t(xdrs, &(rr->rj_vers.high)));

        case AUTH_ERROR:

                return (xdr_enum(xdrs, (enum_t *)&(rr->rj_why)));

        }

        return (FALSE);

}

static struct xdr_discrim reply_dscrm[3] = {

        { (int)MSG_ACCEPTED, xdr_accepted_reply },

        { (int)MSG_DENIED, xdr_rejected_reply },

        { __dontcare__, NULL_xdrproc_t } };

/*

 * XDR a reply message

 */

bool_t

xdr_replymsg(xdrs, rmsg)

        register XDR *xdrs;

        register struct rpc_msg *rmsg;

{

        if (

            xdr_u_int32_t(xdrs, &(rmsg->rm_xid)) &&

            xdr_enum(xdrs, (enum_t *)&(rmsg->rm_direction)) &&

            (rmsg->rm_direction == REPLY) )

                return (xdr_union(xdrs, (enum_t *)&(rmsg->rm_reply.rp_stat),

                   (caddr_t)&(rmsg->rm_reply.ru), reply_dscrm, NULL_xdrproc_t));

        return (FALSE);

}

/*

 * Serializes the "static part" of a call message header.

 * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.

 * The rm_xid is not really static, but the user can easily munge on the fly.

 */

bool_t

xdr_callhdr(xdrs, cmsg)

        register XDR *xdrs;

        register struct rpc_msg *cmsg;

{

        cmsg->rm_direction = CALL;

        cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;

        if (

            (xdrs->x_op == XDR_ENCODE) &&

            xdr_u_int32_t(xdrs, &(cmsg->rm_xid)) &&

            xdr_enum(xdrs, (enum_t *)&(cmsg->rm_direction)) &&

            xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&

            xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_prog)) )

            return (xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_vers)));

        return (FALSE);

}

/* ************************** Client utility routine ************* */

static void

accepted(acpt_stat, error)

        register enum accept_stat acpt_stat;

        register struct rpc_err *error;

{

        switch (acpt_stat) {

        case PROG_UNAVAIL:

                error->re_status = RPC_PROGUNAVAIL;

                return;

        case PROG_MISMATCH:

                error->re_status = RPC_PROGVERSMISMATCH;

                return;

        case PROC_UNAVAIL:

                error->re_status = RPC_PROCUNAVAIL;

                return;

        case GARBAGE_ARGS:

                error->re_status = RPC_CANTDECODEARGS;

                return;

        case SYSTEM_ERR:

                error->re_status = RPC_SYSTEMERROR;

                return;

        case SUCCESS:

                error->re_status = RPC_SUCCESS;

                return;

        }

        /* something's wrong, but we don't know what ... */

        error->re_status = RPC_FAILED;

        error->re_lb.s1 = (long)MSG_ACCEPTED;

        error->re_lb.s2 = (long)acpt_stat;

}

static void

rejected(rjct_stat, error)

        register enum reject_stat rjct_stat;

        register struct rpc_err *error;

{

        switch (rjct_stat) {

        case RPC_VERSMISMATCH:

                error->re_status = RPC_VERSMISMATCH;

                return;

        case AUTH_ERROR:

                error->re_status = RPC_AUTHERROR;

                return;

        default:

                break;

        }

        /* something's wrong, but we don't know what ... */

        error->re_status = RPC_FAILED;

        error->re_lb.s1 = (long)MSG_DENIED;

        error->re_lb.s2 = (long)rjct_stat;

}

/*

 * given a reply message, fills in the error

 */

void

_seterr_reply(msg, error)

        register struct rpc_msg *msg;

        register struct rpc_err *error;

{

        /* optimized for normal, SUCCESSful case */

        switch (msg->rm_reply.rp_stat) {

        case MSG_ACCEPTED:

                if (msg->acpted_rply.ar_stat == SUCCESS) {

                        error->re_status = RPC_SUCCESS;

                        return;

                };

                accepted(msg->acpted_rply.ar_stat, error);

                break;

        case MSG_DENIED:

                rejected(msg->rjcted_rply.rj_stat, error);

                break;

        default:

                error->re_status = RPC_FAILED;

                error->re_lb.s1 = (long)(msg->rm_reply.rp_stat);

                break;

        }

        switch (error->re_status) {

        case RPC_VERSMISMATCH:

                error->re_vers.low = msg->rjcted_rply.rj_vers.low;

                error->re_vers.high = msg->rjcted_rply.rj_vers.high;

                break;

        case RPC_AUTHERROR:

                error->re_why = msg->rjcted_rply.rj_why;

                break;

        case RPC_PROGVERSMISMATCH:

                error->re_vers.low = msg->acpted_rply.ar_vers.low;

                error->re_vers.high = msg->acpted_rply.ar_vers.high;

                break;

        default:

                break;

        }

}