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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 /*
35 * xdr_array.c, Generic XDR routines impelmentation.
36 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
37 * arrays. See xdr.h for more info on the interface to xdr.
38 */
39
40 #include <sys/param.h>
41 #include <sys/cmn_err.h>
42 #include <sys/types.h>
43 #include <sys/systm.h>
44
45 #include <rpc/types.h>
46 #include <rpc/xdr.h>
47
48 #define LASTUNSIGNED ((uint_t)0-1)
49
50 /*
51 * XDR an array of arbitrary elements
52 * *addrp is a pointer to the array, *sizep is the number of elements.
53 * If addrp is NULL (*sizep * elsize) bytes are allocated.
54 * elsize is the size (in bytes) of each element, and elproc is the
55 * xdr procedure to call to handle each element of the array.
56 */
57 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,uint_t * sizep,const uint_t maxsize,const uint_t elsize,const xdrproc_t elproc)58 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
59 const uint_t elsize, const xdrproc_t elproc)
60 {
61 uint_t i;
62 caddr_t target = *addrp;
63 uint_t c; /* the actual element count */
64 bool_t stat = TRUE;
65 uint_t nodesize;
66
67 /* like strings, arrays are really counted arrays */
68 if (!xdr_u_int(xdrs, sizep)) {
69 return (FALSE);
70 }
71 c = *sizep;
72 if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
73 xdrs->x_op != XDR_FREE) {
74 return (FALSE);
75 }
76 nodesize = c * elsize;
77
78 /*
79 * if we are deserializing, we may need to allocate an array.
80 * We also save time by checking for a null array if we are freeing.
81 */
82 if (target == NULL)
83 switch (xdrs->x_op) {
84 case XDR_DECODE:
85 if (c == 0)
86 return (TRUE);
87 *addrp = target = (char *)mem_alloc(nodesize);
88 bzero(target, nodesize);
89 break;
90
91 case XDR_FREE:
92 return (TRUE);
93
94 case XDR_ENCODE:
95 break;
96 }
97
98 /*
99 * now we xdr each element of array
100 */
101 for (i = 0; (i < c) && stat; i++) {
102 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
103 target += elsize;
104 }
105
106 /*
107 * the array may need freeing
108 */
109 if (xdrs->x_op == XDR_FREE) {
110 mem_free(*addrp, nodesize);
111 *addrp = NULL;
112 }
113 return (stat);
114 }
115