rpc_prot.c

VXWORKS源代码

/* rpc_prot.c - the rpc message definition */

/* Copyright 1984-2000 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
 * Copyright (c) 1987 Wind River Systems, Inc.
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * 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
 */

/*
modification history
--------------------
01i,18apr00,ham  fixed compilation warnings.
01h,20feb97,jank removed comment in comment L:37
01g,26may92,rrr  the tree shuffle
		  -changed includes to have absolute path from h/
01f,04oct91,rrr  passed through the ansification filter
		  -changed includes to have absolute path from h/
		  -changed copyright notice
01e,21aug91,wmd   removed redundant declaration of RNDUP.
01d,19apr90,hjb   de-linted.
01c,27oct89,hjb   upgraded to 4.0
01b,11nov87,jlf   added wrs copyright, title, mod history, etc.
01a,01nov87,rdc   first VxWorks version
*/

#ifndef lint
/* static char sccsid[] = "@(#)rpc_prot.c 1.1 86/02/03 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 "rpc/rpctypes.h"
#include "rpc/xdr.h"
#include "rpc/auth.h"
#include "rpc/clnt.h"
#include "rpc/rpc_msg.h"
#include "netinet/in.h"
#include "vxWorks.h"

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

/* struct opaque_auth _null_auth;	now defined in rpc_commondata.c - 4.0 */

/*
 * 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								     /* 4.0 */
xdr_des_block (xdrs, blkp)					     /* 4.0 */
    register XDR *xdrs;
    register union des_block *blkp;
    {								     /* 4.0 */
    return (xdr_opaque (xdrs, (caddr_t) blkp, sizeof (des_block)));  /* 4.0 */
    }								     /* 4.0 */

/*
 * XDR a DES key.
 */
bool_t
xdr_deskey(xdrs, blkp)
	register XDR *xdrs;
	register union des_block *blkp;
{

	if (! xdr_u_long(xdrs, &(blkp->key.high)))
		return (FALSE);
	return (xdr_u_long(xdrs, &(blkp->key.low)));
}

/* * * * * * * * * * * * * * 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)));
	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_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);
}

/* xdr_callmsg () is now in rpc_callmsg.c file.			4.0 */

/*
 * 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 ************* */

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;
}

void
rejected(rjct_stat, error)
	register enum reject_stat rjct_stat;
	register 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 = (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;
	}
}