1 /*
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * xdr_reference.c, Generic XDR routines impelmentation.
31 *
32 * Copyright (C) 1987, Sun Microsystems, Inc.
33 *
34 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
35 * "pointers". See xdr.h for more info on the interface to xdr.
36 */
37
38 #define _DEFAULT_SOURCE
39 #include <stdlib.h>
40 #include <string.h>
41 #include <errno.h>
42
43 #include <rpc/types.h>
44 #include <rpc/xdr.h>
45
46 #include "xdr_private.h"
47
48 #define LASTUNSIGNED ((u_int)0-1)
49
50 /*
51 * XDR an indirect pointer
52 * xdr_reference is for recursively translating a structure that is
53 * referenced by a pointer inside the structure that is currently being
54 * translated. pp references a pointer to storage. If *pp is null
55 * the necessary storage is allocated.
56 * size is the sizeof the referneced structure.
57 * proc is the routine to handle the referenced structure.
58 */
59 bool_t
xdr_reference(XDR * xdrs,caddr_t * pp,u_int size,xdrproc_t proc)60 xdr_reference (XDR * xdrs,
61 caddr_t * pp,
62 u_int size,
63 xdrproc_t proc)
64 {
65 caddr_t loc = *pp;
66 bool_t stat;
67
68 if (loc == NULL)
69 switch (xdrs->x_op)
70 {
71 case XDR_FREE:
72 return TRUE;
73
74 case XDR_DECODE:
75 *pp = loc = (caddr_t) mem_alloc (size);
76 if (loc == NULL)
77 {
78 xdr_warnx ("xdr_reference: out of memory");
79 errno = ENOMEM;
80 return FALSE;
81 }
82 memset (loc, 0, size);
83 break;
84
85 case XDR_ENCODE:
86 break;
87 }
88
89 stat = (*proc) (xdrs, loc, LASTUNSIGNED);
90
91 if (xdrs->x_op == XDR_FREE)
92 {
93 mem_free (loc, size);
94 *pp = NULL;
95 }
96 return stat;
97 }
98
99
100 /*
101 * xdr_pointer():
102 *
103 * XDR a pointer to a possibly recursive data structure. This
104 * differs with xdr_reference in that it can serialize/deserialiaze
105 * trees correctly.
106 *
107 * What's sent is actually a union:
108 *
109 * union object_pointer switch (boolean b) {
110 * case TRUE: object_data data;
111 * case FALSE: void nothing;
112 * }
113 *
114 * > objpp: Pointer to the pointer to the object.
115 * > obj_size: size of the object.
116 * > xdr_obj: routine to XDR an object.
117 *
118 */
119 bool_t
xdr_pointer(XDR * xdrs,char ** objpp,u_int obj_size,xdrproc_t xdr_obj)120 xdr_pointer (XDR * xdrs,
121 char **objpp,
122 u_int obj_size,
123 xdrproc_t xdr_obj)
124 {
125 bool_t more_data;
126
127 more_data = (*objpp != NULL);
128 if (!xdr_bool (xdrs, &more_data))
129 {
130 return FALSE;
131 }
132 if (!more_data)
133 {
134 *objpp = NULL;
135 return TRUE;
136 }
137 return (xdr_reference (xdrs, objpp, obj_size, xdr_obj));
138 }
139
