1/*
2 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24/*      $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $     */
25
26/*
27 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
28 * unrestricted use provided that this legend is included on all tape
29 * media and as a part of the software program in whole or part.  Users
30 * may copy or modify Sun RPC without charge, but are not authorized
31 * to license or distribute it to anyone else except as part of a product or
32 * program developed by the user.
33 *
34 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
35 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
36 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
37 *
38 * Sun RPC is provided with no support and without any obligation on the
39 * part of Sun Microsystems, Inc. to assist in its use, correction,
40 * modification or enhancement.
41 *
42 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
43 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
44 * OR ANY PART THEREOF.
45 *
46 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
47 * or profits or other special, indirect and consequential damages, even if
48 * Sun has been advised of the possibility of such damages.
49 *
50 * Sun Microsystems, Inc.
51 * 2550 Garcia Avenue
52 * Mountain View, California  94043
53 */
54
55#if defined(LIBC_SCCS) && !defined(lint)
56static char *sccsid = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
57static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
58#endif
59#include <sys/cdefs.h>
60
61/*
62 * xdr_mem.h, XDR implementation using memory buffers.
63 *
64 * Copyright (C) 1984, Sun Microsystems, Inc.
65 *
66 * If you have some data to be interpreted as external data representation
67 * or to be converted to external data representation in a memory buffer,
68 * then this is the package for you.
69 *
70 */
71
72#include <sys/types.h>
73
74#include <netinet/in.h>
75
76#include <string.h>
77
78#include "sec_xdr.h"
79
80static void sec_xdrmem_destroy(XDR *);
81
82#ifdef __LP64__
83#define long_callback_ptr_t int *
84#else
85#define long_callback_ptr_t long *
86#endif
87static bool_t sec_xdrmem_getlong_aligned(XDR *, long_callback_ptr_t);
88static bool_t sec_xdrmem_putlong_aligned(XDR *, const long_callback_ptr_t);
89static bool_t sec_xdrmem_getlong_unaligned(XDR *, long_callback_ptr_t);
90static bool_t sec_xdrmem_putlong_unaligned(XDR *, const long_callback_ptr_t);
91
92static bool_t sec_xdrmem_getbytes(XDR *, char *, u_int);
93static bool_t sec_xdrmem_putbytes(XDR *, const char *, u_int);
94/* XXX: w/64-bit pointers, u_int not enough! */
95static u_int sec_xdrmem_getpos(XDR *);
96static bool_t sec_xdrmem_setpos(XDR *, u_int);
97static int32_t *sec_xdrmem_inline_aligned(XDR *, u_int);
98static int32_t *sec_xdrmem_inline_unaligned(XDR *, u_int);
99
100static const struct     xdr_ops sec_xdrmem_ops_aligned = {
101    sec_xdrmem_getlong_aligned,
102    sec_xdrmem_putlong_aligned,
103    sec_xdrmem_getbytes,
104    sec_xdrmem_putbytes,
105    sec_xdrmem_getpos,
106    sec_xdrmem_setpos,
107    sec_xdrmem_inline_aligned,
108    sec_xdrmem_destroy
109};
110
111static const struct     xdr_ops sec_xdrmem_ops_unaligned = {
112    sec_xdrmem_getlong_unaligned,
113    sec_xdrmem_putlong_unaligned,
114    sec_xdrmem_getbytes,
115    sec_xdrmem_putbytes,
116    sec_xdrmem_getpos,
117    sec_xdrmem_setpos,
118    sec_xdrmem_inline_unaligned,
119    sec_xdrmem_destroy
120};
121
122/*
123 * The procedure sec_xdrmem_create initializes a stream descriptor for a
124 * memory buffer.
125 */
126void
127sec_xdrmem_create(xdrs, addr, size, op)
128        XDR *xdrs;
129        char *addr;
130        u_int size;
131        enum xdr_op op;
132{
133    xdrs->x_op = op;
134    xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
135        ? &sec_xdrmem_ops_unaligned : &sec_xdrmem_ops_aligned;
136    xdrs->x_private = xdrs->x_base = addr;
137    xdrs->x_public = NULL;
138    xdrs->x_handy = size;
139}
140
141/*ARGSUSED*/
142static void
143sec_xdrmem_destroy(xdrs)
144        XDR *xdrs;
145{
146
147}
148
149static bool_t
150sec_xdrmem_getlong_aligned(xdrs, lp)
151        XDR *xdrs;
152        long_callback_ptr_t lp;
153{
154    if (xdrs->x_handy < sizeof(int32_t))
155        return (FALSE);
156    xdrs->x_handy -= sizeof(int32_t);
157    if (lp) *lp = ntohl(*(u_int32_t *)xdrs->x_private);
158    xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
159    return (TRUE);
160}
161
162static bool_t
163sec_xdrmem_putlong_aligned(xdrs, lp)
164        XDR *xdrs;
165        const long_callback_ptr_t lp;
166{
167    if (xdrs->x_handy < sizeof(int32_t))
168        return (FALSE);
169    xdrs->x_handy -= sizeof(int32_t);
170    if (lp) *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
171    xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
172    return (TRUE);
173}
174
175static bool_t
176sec_xdrmem_getlong_unaligned(xdrs, lp)
177        XDR *xdrs;
178        long_callback_ptr_t lp;
179{
180    u_int32_t l;
181
182    if (xdrs->x_handy < sizeof(int32_t))
183        return (FALSE);
184    xdrs->x_handy -= sizeof(int32_t);
185    memmove(&l, xdrs->x_private, sizeof(int32_t));
186    if (lp) *lp = ntohl(l);
187    xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
188    return (TRUE);
189}
190
191static bool_t
192sec_xdrmem_putlong_unaligned(xdrs, lp)
193        XDR *xdrs;
194        const long_callback_ptr_t lp;
195{
196    u_int32_t l = 0;
197
198    if (xdrs->x_handy < sizeof(int32_t))
199        return (FALSE);
200    xdrs->x_handy -= sizeof(int32_t);
201    if (lp) l = htonl((u_int32_t)*lp);
202    memmove(xdrs->x_private, &l, sizeof(int32_t));
203    xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
204    return (TRUE);
205}
206
207static bool_t
208sec_xdrmem_getbytes(xdrs, addr, len)
209        XDR *xdrs;
210        char *addr;
211        u_int len;
212{
213    if (xdrs->x_handy < len)
214        return (FALSE);
215    xdrs->x_handy -= len;
216    if (addr) memmove(addr, xdrs->x_private, len);
217    xdrs->x_private = (char *)xdrs->x_private + len;
218    return (TRUE);
219}
220
221static bool_t
222sec_xdrmem_putbytes(xdrs, addr, len)
223        XDR *xdrs;
224        const char *addr;
225        u_int len;
226{
227    if (xdrs->x_handy < len)
228        return (FALSE);
229    xdrs->x_handy -= len;
230    if (addr) memmove(xdrs->x_private, addr, len);
231    xdrs->x_private = (char *)xdrs->x_private + len;
232    return (TRUE);
233}
234
235static u_int
236sec_xdrmem_getpos(xdrs)
237        XDR *xdrs;
238{
239    /* XXX w/64-bit pointers, u_int not enough! */
240    return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
241}
242
243static bool_t
244sec_xdrmem_setpos(xdrs, pos)
245        XDR *xdrs;
246        u_int pos;
247{
248    char *newaddr = xdrs->x_base + pos;
249    char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
250
251    if (newaddr > lastaddr)
252        return (FALSE);
253    xdrs->x_private = newaddr;
254    xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
255    return (TRUE);
256}
257
258static int32_t *
259sec_xdrmem_inline_aligned(xdrs, len)
260        XDR *xdrs;
261        u_int len;
262{
263    int32_t *buf = 0;
264
265    if (xdrs->x_handy >= len) {
266        xdrs->x_handy -= len;
267        buf = (int32_t *)xdrs->x_private;
268        xdrs->x_private = (char *)xdrs->x_private + len;
269    }
270    return (buf);
271}
272
273/* ARGSUSED */
274static int32_t *
275sec_xdrmem_inline_unaligned(xdrs, len)
276        XDR *xdrs;
277        u_int len;
278{
279    return (0);
280}
281
282/**
283 * This is almost a straight copy of the standard implementation, except
284 * that all calls made that move memory don't do so if passed a NULL dest.
285 * getbytes in particular when called from xdr_bytes during sizing of a decode
286 * needs this.
287 */
288