1 /* $NetBSD: xdr_array.c,v 1.3 2019/06/16 16:01:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 #if defined(LIBC_SCCS) && !defined(lint)
36 #if 0
37 static char *sccsid = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
38 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC";
39 #else
40 __RCSID("$NetBSD: xdr_array.c,v 1.3 2019/06/16 16:01:44 christos Exp $");
41 #endif
42 #endif
43
44 /*
45 * xdr_array.c, Generic XDR routines implementation.
46 *
47 * Copyright (C) 1984, Sun Microsystems, Inc.
48 *
49 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
50 * arrays. See xdr.h for more info on the interface to xdr.
51 */
52
53 #if defined(_KERNEL) || defined(_STANDALONE)
54
55 #include <sys/param.h>
56 #include <lib/libkern/libkern.h>
57 #include <rpc/types.h>
58 #include <rpc/xdr.h>
59
60 #else /* _KERNEL || _STANDALONE */
61
62 #include "namespace.h"
63
64 #include <err.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <limits.h>
69
70 #include <rpc/types.h>
71 #include <rpc/xdr.h>
72
73 #ifdef __weak_alias
__weak_alias(xdr_array,_xdr_array)74 __weak_alias(xdr_array,_xdr_array)
75 __weak_alias(xdr_vector,_xdr_vector)
76 #endif
77
78 #endif /* _KERNEL || _STANDALONE */
79
80 /*
81 * XDR an array of arbitrary elements
82 * *addrp is a pointer to the array, *sizep is the number of elements.
83 * If addrp is NULL (*sizep * elsize) bytes are allocated.
84 * elsize is the size (in bytes) of each element, and elproc is the
85 * xdr procedure to call to handle each element of the array.
86 */
87 bool_t
88 xdr_array(XDR *xdrs, char **addrp, u_int *sizep, u_int maxsize, u_int elsize,
89 xdrproc_t elproc)
90 {
91 u_int i;
92 char *target = *addrp;
93 u_int c; /* the actual element count */
94 bool_t stat = TRUE;
95 u_int nodesize;
96
97 /* like strings, arrays are really counted arrays */
98 if (!xdr_u_int(xdrs, sizep))
99 return (FALSE);
100
101 c = *sizep;
102 if ((c > maxsize || UINT_MAX/elsize < c) &&
103 (xdrs->x_op != XDR_FREE))
104 return (FALSE);
105 nodesize = c * elsize;
106
107 /*
108 * if we are deserializing, we may need to allocate an array.
109 * We also save time by checking for a null array if we are freeing.
110 */
111 if (target == NULL)
112 switch (xdrs->x_op) {
113 case XDR_DECODE:
114 if (c == 0)
115 return (TRUE);
116 *addrp = target = mem_alloc(nodesize);
117 if (target == NULL) {
118 warn("%s: out of memory", __func__);
119 return (FALSE);
120 }
121 memset(target, 0, nodesize);
122 break;
123
124 case XDR_FREE:
125 return (TRUE);
126
127 case XDR_ENCODE:
128 break;
129 }
130
131 /*
132 * now we xdr each element of array
133 */
134 for (i = 0; (i < c) && stat; i++) {
135 stat = (*elproc)(xdrs, target);
136 target += elsize;
137 }
138
139 /*
140 * the array may need freeing
141 */
142 if (xdrs->x_op == XDR_FREE) {
143 mem_free(*addrp, nodesize);
144 *addrp = NULL;
145 }
146 return (stat);
147 }
148
149 /*
150 * xdr_vector():
151 *
152 * XDR a fixed length array. Unlike variable-length arrays,
153 * the storage of fixed length arrays is static and unfreeable.
154 * > basep: base of the array
155 * > size: size of the array
156 * > elemsize: size of each element
157 * > xdr_elem: routine to XDR each element
158 */
159 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)160 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
161 xdrproc_t xdr_elem)
162 {
163 u_int i;
164 char *elptr;
165
166 elptr = basep;
167 for (i = 0; i < nelem; i++) {
168 if (!(*xdr_elem)(xdrs, elptr)) {
169 return(FALSE);
170 }
171 elptr += elemsize;
172 }
173 return(TRUE);
174 }
175