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 /*
37 * Generic XDR routines impelmentation.
38 *
39 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
40 * arrays. See xdr.h for more info on the interface to xdr.
41 */
42
43 #include "mt.h"
44 #include <sys/types.h>
45 #include <syslog.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48
49 #include <rpc/types.h>
50 #include <rpc/xdr.h>
51 #include <memory.h>
52
53 #define LASTUNSIGNED ((uint_t)0-1)
54
55 char mem_err_msg_arr[] = "xdr_array: out of memory";
56
57 /*
58 * XDR an array of arbitrary elements
59 * *addrp is a pointer to the array, *sizep is the number of elements.
60 * If *addrp is NULL (*sizep * elsize) bytes are allocated.
61 * elsize is the size (in bytes) of each element, and elproc is the
62 * xdr procedure to call to handle each element of the array.
63 */
64 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,uint_t * sizep,const uint_t maxsize,const uint_t elsize,const xdrproc_t elproc)65 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
66 const uint_t elsize, const xdrproc_t elproc)
67 {
68 uint_t i;
69 caddr_t target = *addrp;
70 uint_t c; /* the actual element count */
71 bool_t stat = TRUE;
72 uint_t nodesize;
73
74 /* like strings, arrays are really counted arrays */
75 if (!xdr_u_int(xdrs, sizep))
76 return (FALSE);
77 c = *sizep;
78 if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
79 xdrs->x_op != XDR_FREE)
80 return (FALSE);
81 nodesize = c * elsize;
82
83 /*
84 * if we are deserializing, we may need to allocate an array.
85 * We also save time by checking for a null array if we are freeing.
86 */
87 if (target == NULL)
88 switch (xdrs->x_op) {
89 case XDR_DECODE:
90 if (c == 0)
91 return (TRUE);
92 *addrp = target = malloc(nodesize);
93 if (target == NULL) {
94 (void) syslog(LOG_ERR, mem_err_msg_arr);
95 return (FALSE);
96 }
97 (void) memset(target, 0, nodesize);
98 break;
99
100 case XDR_FREE:
101 return (TRUE);
102 }
103
104 /*
105 * now we xdr each element of array
106 */
107 for (i = 0; (i < c) && stat; i++) {
108 stat = (*elproc)(xdrs, target);
109 target += elsize;
110 }
111
112 /*
113 * the array may need freeing
114 */
115 if (xdrs->x_op == XDR_FREE) {
116 free(*addrp);
117 *addrp = NULL;
118 }
119 return (stat);
120 }
121
122 /*
123 * xdr_vector():
124 *
125 * XDR a fixed length array. Unlike variable-length arrays,
126 * the storage of fixed length arrays is static and unfreeable.
127 * > basep: base of the array
128 * > size: size of the array
129 * > elemsize: size of each element
130 * > xdr_elem: routine to XDR each element
131 */
132 bool_t
xdr_vector(XDR * xdrs,char * basep,const uint_t nelem,const uint_t elemsize,const xdrproc_t xdr_elem)133 xdr_vector(XDR *xdrs, char *basep, const uint_t nelem,
134 const uint_t elemsize, const xdrproc_t xdr_elem)
135 {
136 uint_t i;
137 char *elptr;
138
139 /* Make sure x_op contains a valid value */
140 if (xdrs->x_op != XDR_ENCODE &&
141 xdrs->x_op != XDR_DECODE &&
142 xdrs->x_op != XDR_FREE)
143 return (FALSE);
144
145 elptr = basep;
146 for (i = 0; i < nelem; i++) {
147 if (!(*xdr_elem)(xdrs, elptr, LASTUNSIGNED))
148 return (FALSE);
149 elptr += elemsize;
150 }
151 return (TRUE);
152 }
153