1 /* $NetBSD: xdr_array.c,v 1.19 2013/03/11 20:19:29 tron 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 #include <sys/cdefs.h> 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char *sccsid = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC"; 39 #else 40 __RCSID("$NetBSD: xdr_array.c,v 1.19 2013/03/11 20:19:29 tron Exp $"); 41 #endif 42 #endif 43 44 /* 45 * xdr_array.c, Generic XDR routines implementation. 46 * 47 * Copyright (C) 1984, Sun Microsystems, Inc. 48 * 49 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 50 * arrays. See xdr.h for more info on the interface to xdr. 51 */ 52 53 #include "namespace.h" 54 55 #include <err.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <limits.h> 60 61 #include <rpc/types.h> 62 #include <rpc/xdr.h> 63 64 #ifdef __weak_alias 65 __weak_alias(xdr_array,_xdr_array) 66 __weak_alias(xdr_vector,_xdr_vector) 67 #endif 68 69 /* 70 * XDR an array of arbitrary elements 71 * *addrp is a pointer to the array, *sizep is the number of elements. 72 * If addrp is NULL (*sizep * elsize) bytes are allocated. 73 * elsize is the size (in bytes) of each element, and elproc is the 74 * xdr procedure to call to handle each element of the array. 75 */ 76 bool_t 77 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, 78 xdrproc_t elproc) 79 { 80 u_int i; 81 caddr_t target = *addrp; 82 u_int c; /* the actual element count */ 83 bool_t stat = TRUE; 84 u_int nodesize; 85 86 /* like strings, arrays are really counted arrays */ 87 if (!xdr_u_int(xdrs, sizep)) 88 return (FALSE); 89 90 c = *sizep; 91 if ((c > maxsize || UINT_MAX/elsize < c) && 92 (xdrs->x_op != XDR_FREE)) 93 return (FALSE); 94 nodesize = c * elsize; 95 96 /* 97 * if we are deserializing, we may need to allocate an array. 98 * We also save time by checking for a null array if we are freeing. 99 */ 100 if (target == NULL) 101 switch (xdrs->x_op) { 102 case XDR_DECODE: 103 if (c == 0) 104 return (TRUE); 105 *addrp = target = mem_alloc(nodesize); 106 if (target == NULL) { 107 warn("%s: out of memory", __func__); 108 return (FALSE); 109 } 110 memset(target, 0, nodesize); 111 break; 112 113 case XDR_FREE: 114 return (TRUE); 115 116 case XDR_ENCODE: 117 break; 118 } 119 120 /* 121 * now we xdr each element of array 122 */ 123 for (i = 0; (i < c) && stat; i++) { 124 stat = (*elproc)(xdrs, target); 125 target += elsize; 126 } 127 128 /* 129 * the array may need freeing 130 */ 131 if (xdrs->x_op == XDR_FREE) { 132 mem_free(*addrp, nodesize); 133 *addrp = NULL; 134 } 135 return (stat); 136 } 137 138 /* 139 * xdr_vector(): 140 * 141 * XDR a fixed length array. Unlike variable-length arrays, 142 * the storage of fixed length arrays is static and unfreeable. 143 * > basep: base of the array 144 * > size: size of the array 145 * > elemsize: size of each element 146 * > xdr_elem: routine to XDR each element 147 */ 148 bool_t 149 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, 150 xdrproc_t xdr_elem) 151 { 152 u_int i; 153 char *elptr; 154 155 elptr = basep; 156 for (i = 0; i < nelem; i++) { 157 if (!(*xdr_elem)(xdrs, elptr)) { 158 return(FALSE); 159 } 160 elptr += elemsize; 161 } 162 return(TRUE); 163 } 164