1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
29/* All Rights Reserved */
30/*
31 * Portions of this source code were derived from Berkeley
32 * 4.3 BSD under license from the Regents of the University of
33 * California.
34 */
35
36#pragma ident	"%Z%%M%	%I%	%E% SMI"
37
38/*
39 * Protocol for the local binder service, or pmap.
40 * All the pmap xdr routines here.
41 */
42
43#include "mt.h"
44#include <rpc/types.h>
45#include <rpc/xdr.h>
46#include <rpc/pmap_prot.h>
47#include <rpc/pmap_rmt.h>
48
49bool_t
50xdr_pmap(XDR *xdrs, struct pmap *objp)
51{
52	rpc_inline_t *buf;
53
54	switch (xdrs->x_op) {
55	case XDR_ENCODE:
56		buf = XDR_INLINE(xdrs, 4 * BYTES_PER_XDR_UNIT);
57		if (buf == NULL) {
58			if (!XDR_PUTINT32(xdrs, (int32_t *)&objp->pm_prog))
59				return (FALSE);
60			if (!XDR_PUTINT32(xdrs, (int32_t *)&objp->pm_vers))
61				return (FALSE);
62			if (!XDR_PUTINT32(xdrs, (int32_t *)&objp->pm_prot))
63				return (FALSE);
64			if (!XDR_PUTINT32(xdrs, (int32_t *)&objp->pm_port))
65				return (FALSE);
66		} else {
67			IXDR_PUT_U_INT32(buf, objp->pm_prog);
68			IXDR_PUT_U_INT32(buf, objp->pm_vers);
69			IXDR_PUT_U_INT32(buf, objp->pm_prot);
70			IXDR_PUT_U_INT32(buf, objp->pm_port);
71		}
72		return (TRUE);
73	case XDR_DECODE:
74		buf = XDR_INLINE(xdrs, 4 * BYTES_PER_XDR_UNIT);
75		if (buf == NULL) {
76			if (!XDR_GETINT32(xdrs, (int32_t *)&objp->pm_prog))
77				return (FALSE);
78			if (!XDR_GETINT32(xdrs, (int32_t *)&objp->pm_vers))
79				return (FALSE);
80			if (!XDR_GETINT32(xdrs, (int32_t *)&objp->pm_prot))
81				return (FALSE);
82			if (!XDR_GETINT32(xdrs, (int32_t *)&objp->pm_port))
83				return (FALSE);
84		} else {
85			objp->pm_prog = IXDR_GET_U_INT32(buf);
86			objp->pm_vers = IXDR_GET_U_INT32(buf);
87			objp->pm_prot = IXDR_GET_U_INT32(buf);
88			objp->pm_port = IXDR_GET_U_INT32(buf);
89		}
90		return (TRUE);
91	case XDR_FREE:
92		return (TRUE);
93	}
94	return (FALSE);
95}
96
97/*
98 * pmaplist_ptr implements a linked list.  The RPCL definition from
99 * pmap_prot.x is:
100 *
101 * struct pm__list {
102 * 	pmap		pml_map;
103 *	struct pm__list *pml_next;
104 * };
105 * typedef pm__list *pmaplist_ptr;
106 *
107 * Recall that "pointers" in XDR are encoded as a boolean, indicating whether
108 * there's any data behind the pointer, followed by the data (if any exists).
109 * The boolean can be interpreted as ``more data follows me''; if FALSE then
110 * nothing follows the boolean; if TRUE then the boolean is followed by an
111 * actual struct pmap, and another pmaplist_ptr (declared in RPCL as "struct
112 * pmaplist *").
113 *
114 * This could be implemented via the xdr_pointer type, though this would
115 * result in one recursive call per element in the list.  Rather than do that
116 * we can ``unwind'' the recursion into a while loop and use xdr_reference to
117 * serialize the pmap elements.
118 */
119bool_t
120xdr_pmaplist_ptr(XDR *xdrs, pmaplist_ptr *rp)
121{
122	/*
123	 * more_elements is pre-computed in case the direction is
124	 * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
125	 * xdr_bool when the direction is XDR_DECODE.
126	 */
127	bool_t more_elements;
128	int freeing = (xdrs->x_op == XDR_FREE);
129	pmaplist_ptr next;
130	pmaplist_ptr next_copy;
131
132	for (;;) {
133		more_elements = (bool_t)(*rp != NULL);
134		if (!xdr_bool(xdrs, &more_elements))
135			return (FALSE);
136		if (!more_elements)
137			return (TRUE);  /* we are done */
138		/*
139		 * the unfortunate side effect of non-recursion is that in
140		 * the case of freeing we must remember the next object
141		 * before we free the current object ...
142		 */
143		if (freeing)
144			next = (*rp)->pml_next;
145		if (!xdr_reference(xdrs, (caddr_t *)rp,
146		    (uint_t)sizeof (struct pmaplist), (xdrproc_t)xdr_pmap))
147			return (FALSE);
148		if (freeing) {
149			next_copy = next;
150			rp = &next_copy;
151			/*
152			 * Note that in the subsequent iteration, next_copy
153			 * gets nulled out by the xdr_reference
154			 * but next itself survives.
155			 */
156		} else {
157			rp = &((*rp)->pml_next);
158		}
159	}
160	/*NOTREACHED*/
161}
162
163/*
164 * xdr_pmaplist() is specified to take a PMAPLIST **, but is identical in
165 * functionality to xdr_pmaplist_ptr().
166 */
167bool_t
168xdr_pmaplist(XDR *xdrs, PMAPLIST **rp)
169{
170	return (xdr_pmaplist_ptr(xdrs, (pmaplist_ptr *)rp));
171}
172
173
174/*
175 * XDR remote call arguments
176 * written for XDR_ENCODE direction only
177 */
178bool_t
179xdr_rmtcallargs(XDR *xdrs, struct p_rmtcallargs *cap)
180{
181	uint_t lenposition, argposition, position;
182	rpc_inline_t *buf;
183
184	buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT);
185	if (buf == NULL) {
186		if (!xdr_u_int(xdrs, (uint_t *)&(cap->prog)) ||
187		    !xdr_u_int(xdrs, (uint_t *)&(cap->vers)) ||
188		    !xdr_u_int(xdrs, (uint_t *)&(cap->proc)))
189			return (FALSE);
190	} else {
191		IXDR_PUT_U_INT32(buf, cap->prog);
192		IXDR_PUT_U_INT32(buf, cap->vers);
193		IXDR_PUT_U_INT32(buf, cap->proc);
194	}
195
196	/*
197	 * All the jugglery for just getting the size of the arguments
198	 */
199	lenposition = XDR_GETPOS(xdrs);
200	if (!xdr_u_int(xdrs, &(cap->args.args_len)))
201		return (FALSE);
202	argposition = XDR_GETPOS(xdrs);
203	if (!(*cap->xdr_args)(xdrs, cap->args.args_val))
204		return (FALSE);
205	position = XDR_GETPOS(xdrs);
206	cap->args.args_len = position - argposition;
207	XDR_SETPOS(xdrs, lenposition);
208	if (!xdr_u_int(xdrs, &(cap->args.args_len)))
209		return (FALSE);
210	XDR_SETPOS(xdrs, position);
211	return (TRUE);
212}
213
214/*
215 * XDR remote call results
216 * written for XDR_DECODE direction only
217 */
218bool_t
219xdr_rmtcallres(XDR *xdrs, struct p_rmtcallres *crp)
220{
221	if (xdr_u_int(xdrs, (uint_t *)&crp->port) &&
222	    xdr_u_int(xdrs, &crp->res.res_len))
223		return ((*(crp->xdr_res))(xdrs, crp->res.res_val));
224	return (FALSE);
225}
226