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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
29 /* All Rights Reserved */
30 /*
31 * Portions of this source code were derived from Berkeley
32 * 4.3 BSD under license from the Regents of the University of
33 * California.
34 */
35
36 #pragma ident "%Z%%M% %I% %E% SMI"
37
38 /*
39 * Generic XDR routines impelmentation.
40 *
41 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
42 * arrays. See xdr.h for more info on the interface to xdr.
43 */
44
45 #include "mt.h"
46 #include <sys/types.h>
47 #include <syslog.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50
51 #include <rpc/types.h>
52 #include <rpc/xdr.h>
53 #include <memory.h>
54
55 #define LASTUNSIGNED ((uint_t)0-1)
56
57 char mem_err_msg_arr[] = "xdr_array: out of memory";
58
59 /*
60 * XDR an array of arbitrary elements
61 * *addrp is a pointer to the array, *sizep is the number of elements.
62 * If *addrp is NULL (*sizep * elsize) bytes are allocated.
63 * elsize is the size (in bytes) of each element, and elproc is the
64 * xdr procedure to call to handle each element of the array.
65 */
66 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,uint_t * sizep,const uint_t maxsize,const uint_t elsize,const xdrproc_t elproc)67 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
68 const uint_t elsize, const xdrproc_t elproc)
69 {
70 uint_t i;
71 caddr_t target = *addrp;
72 uint_t c; /* the actual element count */
73 bool_t stat = TRUE;
74 uint_t nodesize;
75
76 /* like strings, arrays are really counted arrays */
77 if (!xdr_u_int(xdrs, sizep))
78 return (FALSE);
79 c = *sizep;
80 if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
81 xdrs->x_op != XDR_FREE)
82 return (FALSE);
83 nodesize = c * elsize;
84
85 /*
86 * if we are deserializing, we may need to allocate an array.
87 * We also save time by checking for a null array if we are freeing.
88 */
89 if (target == NULL)
90 switch (xdrs->x_op) {
91 case XDR_DECODE:
92 if (c == 0)
93 return (TRUE);
94 *addrp = target = malloc(nodesize);
95 if (target == NULL) {
96 (void) syslog(LOG_ERR, mem_err_msg_arr);
97 return (FALSE);
98 }
99 (void) memset(target, 0, nodesize);
100 break;
101
102 case XDR_FREE:
103 return (TRUE);
104 }
105
106 /*
107 * now we xdr each element of array
108 */
109 for (i = 0; (i < c) && stat; i++) {
110 stat = (*elproc)(xdrs, target);
111 target += elsize;
112 }
113
114 /*
115 * the array may need freeing
116 */
117 if (xdrs->x_op == XDR_FREE) {
118 free(*addrp);
119 *addrp = NULL;
120 }
121 return (stat);
122 }
123
124 /*
125 * xdr_vector():
126 *
127 * XDR a fixed length array. Unlike variable-length arrays,
128 * the storage of fixed length arrays is static and unfreeable.
129 * > basep: base of the array
130 * > size: size of the array
131 * > elemsize: size of each element
132 * > xdr_elem: routine to XDR each element
133 */
134 bool_t
xdr_vector(XDR * xdrs,char * basep,const uint_t nelem,const uint_t elemsize,const xdrproc_t xdr_elem)135 xdr_vector(XDR *xdrs, char *basep, const uint_t nelem,
136 const uint_t elemsize, const xdrproc_t xdr_elem)
137 {
138 uint_t i;
139 char *elptr;
140
141 elptr = basep;
142 for (i = 0; i < nelem; i++) {
143 if (!(*xdr_elem)(xdrs, elptr, LASTUNSIGNED))
144 return (FALSE);
145 elptr += elemsize;
146 }
147 return (TRUE);
148 }
149