1/*	$NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 *     * Redistributions of source code must retain the above copyright
13 *       notice, this list of conditions and the following disclaimer.
14 *     * Redistributions in binary form must reproduce the above
15 *       copyright notice, this list of conditions and the following
16 *       disclaimer in the documentation and/or other materials
17 *       provided with the distribution.
18 *     * Neither the name of the "Oracle America, Inc." nor the names of its
19 *       contributors may be used to endorse or promote products derived
20 *       from this software without specific prior written permission.
21 *
22 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
38static char *sccsid = "@(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC";
39#endif
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
42
43/*
44 * xdr_mem.h, XDR implementation using memory buffers.
45 *
46 * If you have some data to be interpreted as external data representation
47 * or to be converted to external data representation in a memory buffer,
48 * then this is the package for you.
49 *
50 */
51
52#include "namespace.h"
53#include <sys/types.h>
54
55#include <netinet/in.h>
56
57#include <string.h>
58
59#include <rpc/types.h>
60#include <rpc/xdr.h>
61#include "un-namespace.h"
62
63static void xdrmem_destroy(XDR *);
64static bool_t xdrmem_getlong_aligned(XDR *, long *);
65static bool_t xdrmem_putlong_aligned(XDR *, const long *);
66static bool_t xdrmem_getlong_unaligned(XDR *, long *);
67static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
68static bool_t xdrmem_getbytes(XDR *, char *, u_int);
69static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
70/* XXX: w/64-bit pointers, u_int not enough! */
71static u_int xdrmem_getpos(XDR *);
72static bool_t xdrmem_setpos(XDR *, u_int);
73static int32_t *xdrmem_inline_aligned(XDR *, u_int);
74static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
75
76static const struct	xdr_ops xdrmem_ops_aligned = {
77	xdrmem_getlong_aligned,
78	xdrmem_putlong_aligned,
79	xdrmem_getbytes,
80	xdrmem_putbytes,
81	xdrmem_getpos,
82	xdrmem_setpos,
83	xdrmem_inline_aligned,
84	xdrmem_destroy
85};
86
87static const struct	xdr_ops xdrmem_ops_unaligned = {
88	xdrmem_getlong_unaligned,
89	xdrmem_putlong_unaligned,
90	xdrmem_getbytes,
91	xdrmem_putbytes,
92	xdrmem_getpos,
93	xdrmem_setpos,
94	xdrmem_inline_unaligned,
95	xdrmem_destroy
96};
97
98/*
99 * The procedure xdrmem_create initializes a stream descriptor for a
100 * memory buffer.
101 */
102void
103xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
104{
105
106	xdrs->x_op = op;
107	xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
108	    ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
109	xdrs->x_private = xdrs->x_base = addr;
110	xdrs->x_handy = size;
111}
112
113/*ARGSUSED*/
114static void
115xdrmem_destroy(XDR *xdrs)
116{
117
118}
119
120static bool_t
121xdrmem_getlong_aligned(XDR *xdrs, long *lp)
122{
123
124	if (xdrs->x_handy < sizeof(int32_t))
125		return (FALSE);
126	xdrs->x_handy -= sizeof(int32_t);
127	*lp = ntohl(*(u_int32_t *)xdrs->x_private);
128	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
129	return (TRUE);
130}
131
132static bool_t
133xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
134{
135
136	if (xdrs->x_handy < sizeof(int32_t))
137		return (FALSE);
138	xdrs->x_handy -= sizeof(int32_t);
139	*(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
140	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
141	return (TRUE);
142}
143
144static bool_t
145xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
146{
147	u_int32_t l;
148
149	if (xdrs->x_handy < sizeof(int32_t))
150		return (FALSE);
151	xdrs->x_handy -= sizeof(int32_t);
152	memmove(&l, xdrs->x_private, sizeof(int32_t));
153	*lp = ntohl(l);
154	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
155	return (TRUE);
156}
157
158static bool_t
159xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
160{
161	u_int32_t l;
162
163	if (xdrs->x_handy < sizeof(int32_t))
164		return (FALSE);
165	xdrs->x_handy -= sizeof(int32_t);
166	l = htonl((u_int32_t)*lp);
167	memmove(xdrs->x_private, &l, sizeof(int32_t));
168	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
169	return (TRUE);
170}
171
172static bool_t
173xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
174{
175
176	if (xdrs->x_handy < len)
177		return (FALSE);
178	xdrs->x_handy -= len;
179	memmove(addr, xdrs->x_private, len);
180	xdrs->x_private = (char *)xdrs->x_private + len;
181	return (TRUE);
182}
183
184static bool_t
185xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
186{
187
188	if (xdrs->x_handy < len)
189		return (FALSE);
190	xdrs->x_handy -= len;
191	memmove(xdrs->x_private, addr, len);
192	xdrs->x_private = (char *)xdrs->x_private + len;
193	return (TRUE);
194}
195
196static u_int
197xdrmem_getpos(XDR *xdrs)
198{
199
200	/* XXX w/64-bit pointers, u_int not enough! */
201	return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
202}
203
204static bool_t
205xdrmem_setpos(XDR *xdrs, u_int pos)
206{
207	char *newaddr = xdrs->x_base + pos;
208	char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
209
210	if (newaddr > lastaddr)
211		return (FALSE);
212	xdrs->x_private = newaddr;
213	xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
214	return (TRUE);
215}
216
217static int32_t *
218xdrmem_inline_aligned(XDR *xdrs, u_int len)
219{
220	int32_t *buf = NULL;
221
222	if (xdrs->x_handy >= len) {
223		xdrs->x_handy -= len;
224		buf = (int32_t *)xdrs->x_private;
225		xdrs->x_private = (char *)xdrs->x_private + len;
226	}
227	return (buf);
228}
229
230/* ARGSUSED */
231static int32_t *
232xdrmem_inline_unaligned(XDR *xdrs, u_int len)
233{
234
235	return (0);
236}
237