1 /* $NetBSD: xdr_array.c,v 1.3 2019/06/16 16:01:44 christos 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 1.3 2019/06/16 16:01:44 christos 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 #if defined(_KERNEL) || defined(_STANDALONE) 54 55 #include <sys/param.h> 56 #include <lib/libkern/libkern.h> 57 #include <rpc/types.h> 58 #include <rpc/xdr.h> 59 60 #else /* _KERNEL || _STANDALONE */ 61 62 #include "namespace.h" 63 64 #include <err.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <limits.h> 69 70 #include <rpc/types.h> 71 #include <rpc/xdr.h> 72 73 #ifdef __weak_alias 74 __weak_alias(xdr_array,_xdr_array) 75 __weak_alias(xdr_vector,_xdr_vector) 76 #endif 77 78 #endif /* _KERNEL || _STANDALONE */ 79 80 /* 81 * XDR an array of arbitrary elements 82 * *addrp is a pointer to the array, *sizep is the number of elements. 83 * If addrp is NULL (*sizep * elsize) bytes are allocated. 84 * elsize is the size (in bytes) of each element, and elproc is the 85 * xdr procedure to call to handle each element of the array. 86 */ 87 bool_t 88 xdr_array(XDR *xdrs, char **addrp, u_int *sizep, u_int maxsize, u_int elsize, 89 xdrproc_t elproc) 90 { 91 u_int i; 92 char *target = *addrp; 93 u_int c; /* the actual element count */ 94 bool_t stat = TRUE; 95 u_int nodesize; 96 97 /* like strings, arrays are really counted arrays */ 98 if (!xdr_u_int(xdrs, sizep)) 99 return (FALSE); 100 101 c = *sizep; 102 if ((c > maxsize || UINT_MAX/elsize < c) && 103 (xdrs->x_op != XDR_FREE)) 104 return (FALSE); 105 nodesize = c * elsize; 106 107 /* 108 * if we are deserializing, we may need to allocate an array. 109 * We also save time by checking for a null array if we are freeing. 110 */ 111 if (target == NULL) 112 switch (xdrs->x_op) { 113 case XDR_DECODE: 114 if (c == 0) 115 return (TRUE); 116 *addrp = target = mem_alloc(nodesize); 117 if (target == NULL) { 118 warn("%s: out of memory", __func__); 119 return (FALSE); 120 } 121 memset(target, 0, nodesize); 122 break; 123 124 case XDR_FREE: 125 return (TRUE); 126 127 case XDR_ENCODE: 128 break; 129 } 130 131 /* 132 * now we xdr each element of array 133 */ 134 for (i = 0; (i < c) && stat; i++) { 135 stat = (*elproc)(xdrs, target); 136 target += elsize; 137 } 138 139 /* 140 * the array may need freeing 141 */ 142 if (xdrs->x_op == XDR_FREE) { 143 mem_free(*addrp, nodesize); 144 *addrp = NULL; 145 } 146 return (stat); 147 } 148 149 /* 150 * xdr_vector(): 151 * 152 * XDR a fixed length array. Unlike variable-length arrays, 153 * the storage of fixed length arrays is static and unfreeable. 154 * > basep: base of the array 155 * > size: size of the array 156 * > elemsize: size of each element 157 * > xdr_elem: routine to XDR each element 158 */ 159 bool_t 160 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, 161 xdrproc_t xdr_elem) 162 { 163 u_int i; 164 char *elptr; 165 166 elptr = basep; 167 for (i = 0; i < nelem; i++) { 168 if (!(*xdr_elem)(xdrs, elptr)) { 169 return(FALSE); 170 } 171 elptr += elemsize; 172 } 173 return(TRUE); 174 } 175