lib/librpc/rpc/rpc_prot.c

/*
 * 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 = "$Id: rpc_prot.c,v 1.3 1993/08/26 00:53:36 jtc 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_long(xdrs, &(ar->ar_vers.low)))
                        return (FALSE);
                return (xdr_u_long(xdrs, &(ar->ar_vers.high)));
        }
        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_long(xdrs, &(rr->rj_vers.low)))
                        return (FALSE);
                return (xdr_u_long(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_long(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_long(xdrs, &(cmsg->rm_xid)) &&
            xdr_enum(xdrs, (enum_t *)&(cmsg->rm_direction)) &&
            xdr_u_long(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
            xdr_u_long(xdrs, &(cmsg->rm_call.cb_prog)) )
            return (xdr_u_long(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;
        }
        /* 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;
        }
}