/* @(#)rpc_prot.c       2.3 88/08/07 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * 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.
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * rpc_prot.c
 *
 * 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 <gssrpc/rpc.h>

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

/*
 * XDR an opaque authentication struct
 * (see auth.h)
 */
bool_t
xdr_opaque_auth(XDR *xdrs, 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(XDR *xdrs, 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(XDR *xdrs, 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_rpcvers(xdrs, &(ar->ar_vers.low)))
                        return (FALSE);
                return (xdr_rpcvers(xdrs, &(ar->ar_vers.high)));

        case GARBAGE_ARGS:
        case SYSTEM_ERR:
        case PROC_UNAVAIL:
        case PROG_UNAVAIL:
                break;
        }
        return (TRUE);  /* TRUE => open ended set of problems */
}

/*
 * XDR the MSG_DENIED part of a reply message union
 */
bool_t
xdr_rejected_reply(XDR *xdrs, 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_rpcvers(xdrs, &(rr->rj_vers.low)))
                        return (FALSE);
                return (xdr_rpcvers(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, (xdrproc_t)xdr_accepted_reply },
        { (int)MSG_DENIED, (xdrproc_t)xdr_rejected_reply },
        { __dontcare__, NULL_xdrproc_t } };

/*
 * XDR a reply message
 */
bool_t
xdr_replymsg(XDR *xdrs, struct rpc_msg *rmsg)
{
        if (
            xdr_u_int32(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(XDR *xdrs, 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(xdrs, &(cmsg->rm_xid)) &&
            xdr_enum(xdrs, (enum_t *)&(cmsg->rm_direction)) &&
            xdr_rpcvers(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
            xdr_rpcprog(xdrs, &(cmsg->rm_call.cb_prog)) )
            return (xdr_rpcvers(xdrs, &(cmsg->rm_call.cb_vers)));
        return (FALSE);
}

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

static void
accepted(enum accept_stat acpt_stat, 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 = (int32_t)MSG_ACCEPTED;
        error->re_lb.s2 = (int32_t)acpt_stat;
}

static void
rejected(enum reject_stat rjct_stat, struct rpc_err *error)
{

        switch (rjct_stat) {

        case RPC_MISMATCH:
                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 = (int32_t)MSG_DENIED;
        error->re_lb.s2 = (int32_t)rjct_stat;
}

/*
 * given a reply message, fills in the error
 */
void
gssrpc__seterr_reply(struct rpc_msg *msg, 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 = (int32_t)(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;

        case RPC_FAILED:
        case RPC_SUCCESS:
        case RPC_PROGNOTREGISTERED:
        case RPC_PMAPFAILURE:
        case RPC_UNKNOWNPROTO:
        case RPC_UNKNOWNHOST:
        case RPC_SYSTEMERROR:
        case RPC_CANTDECODEARGS:
        case RPC_PROCUNAVAIL:
        case RPC_PROGUNAVAIL:
        case RPC_TIMEDOUT:
        case RPC_CANTRECV:
        case RPC_CANTSEND:
        case RPC_CANTDECODERES:
        case RPC_CANTENCODEARGS:
        default:
                break;
        }
}