;/*
; * 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.
; */

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

;/*
; * 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_opaque_auth

/*
 * XDR a DES block
 */
bool_t xdr_des_block(xdrs, blkp)
register XDR *xdrs;
register des_block *blkp;
{
    return (xdr_opaque(xdrs, (char*) blkp, sizeof(des_block)));
}

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

/*
 * XDR the MSG_ACCEPTED part of a reply message union
 */
static 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
 */
static 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, (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(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),
                   (char*) & (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;
    }
}