1 /* $OpenBSD: xdr_array.c,v 1.14 2017/01/21 08:29:13 krw Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * xdr_array.c, Generic XDR routines implementation.
36 *
37 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
38 * arrays. See xdr.h for more info on the interface to xdr.
39 */
40
41
42
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <limits.h>
47 #include <rpc/types.h>
48 #include <rpc/xdr.h>
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,u_int * sizep,u_int maxsize,u_int elsize,xdrproc_t elproc)58 xdr_array(XDR *xdrs,
59 caddr_t *addrp, /* array pointer */
60 u_int *sizep, /* number of elements */
61 u_int maxsize, /* max numberof elements */
62 u_int elsize, /* size in bytes of each element */
63 xdrproc_t elproc) /* xdr routine to handle each element */
64 {
65 caddr_t target = *addrp;
66 u_int nodesize, c, i;
67 bool_t stat = TRUE;
68
69 /* like strings, arrays are really counted arrays */
70 if (!xdr_u_int(xdrs, sizep))
71 return (FALSE);
72
73 c = *sizep;
74 if ((c > maxsize || c > UINT_MAX/elsize) &&
75 xdrs->x_op != XDR_FREE)
76 return (FALSE);
77 nodesize = c * elsize;
78
79 /*
80 * if we are deserializing, we may need to allocate an array.
81 * We also save time by checking for a null array if we are freeing.
82 */
83 if (target == NULL) {
84 switch (xdrs->x_op) {
85 case XDR_DECODE:
86 if (c == 0)
87 return (TRUE);
88 *addrp = target = mem_alloc(nodesize);
89 if (target == NULL)
90 return (FALSE);
91 memset(target, 0, nodesize);
92 break;
93 case XDR_FREE:
94 return (TRUE);
95 default:
96 break;
97 }
98 }
99
100 /*
101 * now we xdr each element of array
102 */
103 for (i = 0; (i < c) && stat; i++) {
104 stat = (*elproc)(xdrs, target);
105 target += elsize;
106 }
107
108 /*
109 * the array may need freeing
110 */
111 if (xdrs->x_op == XDR_FREE) {
112 mem_free(*addrp, nodesize);
113 *addrp = NULL;
114 }
115 return (stat);
116 }
117 DEF_WEAK(xdr_array);
118
119 /*
120 * xdr_vector():
121 *
122 * XDR a fixed length array. Unlike variable-length arrays,
123 * the storage of fixed length arrays is static and unfreeable.
124 * > basep: base of the array
125 * > size: size of the array
126 * > elemsize: size of each element
127 * > xdr_elem: routine to XDR each element
128 */
129 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)130 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
131 xdrproc_t xdr_elem)
132 {
133 char *elptr;
134 u_int i;
135
136 elptr = basep;
137 for (i = 0; i < nelem; i++) {
138 if (!(*xdr_elem)(xdrs, elptr))
139 return(FALSE);
140 elptr += elemsize;
141 }
142 return(TRUE);
143 }
144