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 * "pointers". See xdr.h for more info on the interface to xdr.
41 */
42 #include "mt.h"
43 #include <sys/types.h>
44 #include <syslog.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <rpc/types.h>
48 #include <rpc/xdr.h>
49 #include <memory.h>
50
51 #define LASTUNSIGNED ((uint_t)0-1)
52 char mem_err_msg_ref[] = "xdr_reference: out of memory";
53
54 /*
55 * XDR an indirect pointer
56 * xdr_reference is for recursively translating a structure that is
57 * referenced by a pointer inside the structure that is currently being
58 * translated. pp references a pointer to storage. If *pp is null
59 * the necessary storage is allocated.
60 * size is the sizeof the referneced structure.
61 * proc is the routine to handle the referenced structure.
62 */
63 bool_t
xdr_reference(XDR * xdrs,caddr_t * pp,uint_t size,const xdrproc_t proc)64 xdr_reference(XDR *xdrs, caddr_t *pp, uint_t size, const xdrproc_t proc)
65 {
66 caddr_t loc = *pp;
67 bool_t stat;
68
69 /* Make sure x_op contains a valid value */
70 if (xdrs->x_op != XDR_ENCODE &&
71 xdrs->x_op != XDR_DECODE &&
72 xdrs->x_op != XDR_FREE)
73 return (FALSE);
74
75 if (loc == NULL)
76 switch (xdrs->x_op) {
77 case XDR_FREE:
78 return (TRUE);
79 case XDR_DECODE:
80 *pp = loc = malloc(size);
81 if (loc == NULL) {
82 (void) syslog(LOG_ERR, mem_err_msg_ref);
83 return (FALSE);
84 }
85 (void) memset(loc, 0, (int)size);
86 break;
87 }
88
89 stat = (*proc)(xdrs, loc, LASTUNSIGNED);
90
91 if (xdrs->x_op == XDR_FREE) {
92 free(loc);
93 *pp = NULL;
94 }
95 return (stat);
96 }
97
98
99 /*
100 * xdr_pointer():
101 *
102 * XDR a pointer to a possibly recursive data structure. This
103 * differs with xdr_reference in that it can serialize/deserialiaze
104 * trees correctly.
105 *
106 * What's sent is actually a union:
107 *
108 * union object_pointer switch (boolean b) {
109 * case TRUE: object_data data;
110 * case FALSE: void nothing;
111 * }
112 *
113 * > objpp: Pointer to the pointer to the object.
114 * > obj_size: size of the object.
115 * > xdr_obj: routine to XDR an object.
116 *
117 */
118 bool_t
xdr_pointer(XDR * xdrs,char ** objpp,uint_t obj_size,const xdrproc_t xdr_obj)119 xdr_pointer(XDR *xdrs, char **objpp, uint_t obj_size, const xdrproc_t xdr_obj)
120 {
121 bool_t more_data;
122
123 more_data = (*objpp != NULL);
124 if (!xdr_bool(xdrs, &more_data))
125 return (FALSE);
126 if (!more_data) {
127 *objpp = NULL;
128 return (TRUE);
129 }
130 return (xdr_reference(xdrs, objpp, obj_size, xdr_obj));
131 }
132