1/*
2 * Copyright (c) 2006,2011,2013-2014 Apple 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_array.c,v 1.12 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_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
57static char *sccsid = "@(#)xdr_array.c    2.1 88/07/29 4.0 RPCSRC";
58#endif
59#include <sys/cdefs.h>
60
61/*
62 * xdr_array.c, Generic XDR routines impelmentation.
63 *
64 * Copyright (C) 1984, Sun Microsystems, Inc.
65 *
66 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
67 * arrays.  See xdr.h for more info on the interface to xdr.
68 */
69
70#include <err.h>
71#include <limits.h>
72#include <stdio.h>
73#include <stdlib.h>
74#include <string.h>
75#include <assert.h>
76
77#include "sec_xdr.h"
78
79/*
80 * XDR an array of arbitrary elements
81 * *addrp is a pointer to the array, *sizep is the number of elements.
82 * If addrp is NULL (*sizep * elsize) bytes are allocated.
83 * elsize is the size (in bytes) of each element, and elproc is the
84 * xdr procedure to call to handle each element of the array.
85 */
86bool_t
87sec_xdr_array(XDR *xdrs, uint8_t **addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
88{
89    u_int i;
90    bool_t stat = TRUE;
91
92    u_int c = sizep ? *sizep : 0;  /* the actual element count */
93    /* like strings, arrays are really counted arrays */
94    if (!xdr_u_int(xdrs, &c))
95        return (FALSE);
96
97    if (sizep && (xdrs->x_op == XDR_DECODE))
98        *sizep = c;
99
100    // XXX/cs on decode if c == 0 return
101
102    if ((c > maxsize || UINT_MAX/elsize < c) && (xdrs->x_op != XDR_FREE))
103        return (FALSE);
104
105    if (elsize > 1024) {
106        // Structure suspiciously large: 1024 is arbitrary upper bound
107        // for struct sizes (non-nested size)
108        assert(FALSE);
109        return (FALSE);
110    }
111
112    u_int nodesize = c * elsize;
113    uint8_t *target = addrp ? *addrp : NULL;
114
115    uint8_t obj[elsize];
116
117    bool_t sizeof_alloc = sec_xdr_arena_size_allocator(xdrs);
118
119    /*
120     * if we are deserializing, we may need to allocate an array.
121     * We also save time by checking for a null array if we are freeing.
122     */
123    if (target == NULL) {
124        switch (xdrs->x_op) {
125        case XDR_DECODE:
126            if (c == 0)
127                return (TRUE);
128			if (!sec_mem_alloc(xdrs, nodesize, &target))
129				return (FALSE);
130			if (!target)
131				target = &obj[0];
132            if (!sizeof_alloc)
133				*addrp = target;
134            break;
135
136        case XDR_FREE:
137            return (TRUE);
138
139        case XDR_ENCODE:
140            break;
141        }
142    }
143
144    /*
145     * now we xdr each element of array
146     */
147    for (i = 0; (i < c) && stat; i++) {
148        if ((xdrs->x_op == XDR_DECODE) && sizeof_alloc)
149            memset(obj, 0, elsize);
150        stat = (*elproc)(xdrs, target, 0);
151        if ((xdrs->x_op == XDR_ENCODE) || !sizeof_alloc)
152            target += elsize;
153    }
154
155    /*
156     * the array may need freeing
157     */
158    if (xdrs->x_op == XDR_FREE) {
159        sec_mem_free(xdrs, *addrp, nodesize);
160        *addrp = NULL;
161    }
162    return (stat);
163}
164
165/**
166 * This is almost a straight copy of the standard implementation, except
167 * that all calls made that allocate memory can defer to an alternate
168 * mechanism, with the purpose to allocate from one block of memory on
169 * *decode*
170 */
171