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/* @(#)rpc_prot.c       2.3 88/08/07 4.0 RPCSRC */

/*

 * 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 0

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

#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.

 */

#define __FORCE_GLIBC

#include <features.h>

#include <sys/param.h>

#include <rpc/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_u_long (xdrs, &(ar->ar_vers.low)))

        return FALSE;

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

    default:

      return TRUE;

    }

  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_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 const 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)

     XDR *xdrs;

     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)

     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_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 (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 = (long) MSG_ACCEPTED;

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

}

static void

rejected (enum reject_stat rjct_stat,

          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:

      /* 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;

      return;

    }

}

/*

 * given a reply message, fills in the error

 */

void

_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 = (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;

    }

}