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/* $NetBSD: rpc_prot.c,v 1.16 2000/06/02 23:11:13 fvdl Exp $ */
/*
* 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 *sccsid2 = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)rpc_prot.c 2.3 88/08/07 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/rpc/rpc_prot.c 184588 2008-11-03 10:38:00Z dfr $");
/*
* 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 <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/clnt.h>
#include <rpc/rpc_msg.h>
MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
#define assert(exp) KASSERT(exp, ("bad arguments"))
static enum clnt_stat accepted(enum accept_stat, struct rpc_err *);
static enum clnt_stat rejected(enum reject_stat, struct rpc_err *);
/* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */
struct opaque_auth _null_auth;
/*
* XDR an opaque authentication struct
* (see auth.h)
*/
bool_t
xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)
{
assert(xdrs != NULL);
assert(ap != NULL);
if (xdr_enum(xdrs, &(ap->oa_flavor)))
return (xdr_bytes(xdrs, &ap->oa_base,
&ap->oa_length, MAX_AUTH_BYTES));
return (FALSE);
}
/* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */
/*
* XDR the MSG_ACCEPTED part of a reply message union
*/
bool_t
xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar)
{
enum accept_stat *par_stat;
assert(xdrs != NULL);
assert(ar != NULL);
par_stat = &ar->ar_stat;
/* personalized union, rather than calling xdr_union */
if (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))
return (FALSE);
if (! xdr_enum(xdrs, (enum_t *) par_stat))
return (FALSE);
switch (ar->ar_stat) {
case SUCCESS:
if (ar->ar_results.proc != (xdrproc_t) xdr_void)
return ((*(ar->ar_results.proc))(xdrs,
ar->ar_results.where));
else
return (TRUE);
case PROG_MISMATCH:
if (! xdr_uint32_t(xdrs, &(ar->ar_vers.low)))
return (FALSE);
return (xdr_uint32_t(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)
{
enum reject_stat *prj_stat;
enum auth_stat *prj_why;
assert(xdrs != NULL);
assert(rr != NULL);
prj_stat = &rr->rj_stat;
/* personalized union, rather than calling xdr_union */
if (! xdr_enum(xdrs, (enum_t *) prj_stat))
return (FALSE);
switch (rr->rj_stat) {
case RPC_MISMATCH:
if (! xdr_uint32_t(xdrs, &(rr->rj_vers.low)))
return (FALSE);
return (xdr_uint32_t(xdrs, &(rr->rj_vers.high)));
case AUTH_ERROR:
prj_why = &rr->rj_why;
return (xdr_enum(xdrs, (enum_t *) prj_why));
}
/* NOTREACHED */
assert(0);
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(XDR *xdrs, struct rpc_msg *rmsg)
{
int32_t *buf;
enum msg_type *prm_direction;
enum reply_stat *prp_stat;
assert(xdrs != NULL);
assert(rmsg != NULL);
if (xdrs->x_op == XDR_DECODE) {
buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT);
if (buf != NULL) {
rmsg->rm_xid = IXDR_GET_UINT32(buf);
rmsg->rm_direction = IXDR_GET_ENUM(buf, enum msg_type);
if (rmsg->rm_direction != REPLY) {
return (FALSE);
}
rmsg->rm_reply.rp_stat =
IXDR_GET_ENUM(buf, enum reply_stat);
if (rmsg->rm_reply.rp_stat == MSG_ACCEPTED)
return (xdr_accepted_reply(xdrs,
&rmsg->acpted_rply));
else if (rmsg->rm_reply.rp_stat == MSG_DENIED)
return (xdr_rejected_reply(xdrs,
&rmsg->rjcted_rply));
else
return (FALSE);
}
}
prm_direction = &rmsg->rm_direction;
prp_stat = &rmsg->rm_reply.rp_stat;
if (
xdr_uint32_t(xdrs, &(rmsg->rm_xid)) &&
xdr_enum(xdrs, (enum_t *) prm_direction) &&
(rmsg->rm_direction == REPLY) )
return (xdr_union(xdrs, (enum_t *) prp_stat,
(caddr_t)(void *)&(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)
{
enum msg_type *prm_direction;
assert(xdrs != NULL);
assert(cmsg != NULL);
prm_direction = &cmsg->rm_direction;
cmsg->rm_direction = CALL;
cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
if (
(xdrs->x_op == XDR_ENCODE) &&
xdr_uint32_t(xdrs, &(cmsg->rm_xid)) &&
xdr_enum(xdrs, (enum_t *) prm_direction) &&
xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_prog)) )
return (xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_vers)));
return (FALSE);
}
/* ************************** Client utility routine ************* */
static enum clnt_stat
accepted(enum accept_stat acpt_stat, struct rpc_err *error)
{
assert(error != NULL);
switch (acpt_stat) {
case PROG_UNAVAIL:
error->re_status = RPC_PROGUNAVAIL;
return (RPC_PROGUNAVAIL);
case PROG_MISMATCH:
error->re_status = RPC_PROGVERSMISMATCH;
return (RPC_PROGVERSMISMATCH);
case PROC_UNAVAIL:
return (RPC_PROCUNAVAIL);
case GARBAGE_ARGS:
return (RPC_CANTDECODEARGS);
case SYSTEM_ERR:
return (RPC_SYSTEMERROR);
case SUCCESS:
return (RPC_SUCCESS);
}
/* NOTREACHED */
/* something's wrong, but we don't know what ... */
error->re_lb.s1 = (int32_t)MSG_ACCEPTED;
error->re_lb.s2 = (int32_t)acpt_stat;
return (RPC_FAILED);
}
static enum clnt_stat
rejected(enum reject_stat rjct_stat, struct rpc_err *error)
{
assert(error != NULL);
switch (rjct_stat) {
case RPC_MISMATCH:
return (RPC_VERSMISMATCH);
case AUTH_ERROR:
return (RPC_AUTHERROR);
}
/* something's wrong, but we don't know what ... */
/* NOTREACHED */
error->re_lb.s1 = (int32_t)MSG_DENIED;
error->re_lb.s2 = (int32_t)rjct_stat;
return (RPC_FAILED);
}
/*
* given a reply message, fills in the error
*/
enum clnt_stat
_seterr_reply(struct rpc_msg *msg, struct rpc_err *error)
{
enum clnt_stat stat;
assert(msg != NULL);
assert(error != NULL);
/* optimized for normal, SUCCESSful case */
switch (msg->rm_reply.rp_stat) {
case MSG_ACCEPTED:
if (msg->acpted_rply.ar_stat == SUCCESS) {
stat = RPC_SUCCESS;
return (stat);
}
stat = accepted(msg->acpted_rply.ar_stat, error);
break;
case MSG_DENIED:
stat = rejected(msg->rjcted_rply.rj_stat, error);
break;
default:
stat = RPC_FAILED;
error->re_lb.s1 = (int32_t)(msg->rm_reply.rp_stat);
break;
}
error->re_status = stat;
switch (stat) {
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;
}
return (stat);
}