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 * arrays. See xdr.h for more info on the interface to xdr. 41 */ 42 43 #include "mt.h" 44 #include <sys/types.h> 45 #include <syslog.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 49 #include <rpc/types.h> 50 #include <rpc/xdr.h> 51 #include <memory.h> 52 53 #define LASTUNSIGNED ((uint_t)0-1) 54 55 char mem_err_msg_arr[] = "xdr_array: out of memory"; 56 57 /* 58 * XDR an array of arbitrary elements 59 * *addrp is a pointer to the array, *sizep is the number of elements. 60 * If *addrp is NULL (*sizep * elsize) bytes are allocated. 61 * elsize is the size (in bytes) of each element, and elproc is the 62 * xdr procedure to call to handle each element of the array. 63 */ 64 bool_t 65 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize, 66 const uint_t elsize, const xdrproc_t elproc) 67 { 68 uint_t i; 69 caddr_t target = *addrp; 70 uint_t c; /* the actual element count */ 71 bool_t stat = TRUE; 72 uint_t nodesize; 73 74 /* like strings, arrays are really counted arrays */ 75 if (!xdr_u_int(xdrs, sizep)) 76 return (FALSE); 77 c = *sizep; 78 if ((c > maxsize || LASTUNSIGNED / elsize < c) && 79 xdrs->x_op != XDR_FREE) 80 return (FALSE); 81 nodesize = c * elsize; 82 83 /* 84 * if we are deserializing, we may need to allocate an array. 85 * We also save time by checking for a null array if we are freeing. 86 */ 87 if (target == NULL) 88 switch (xdrs->x_op) { 89 case XDR_DECODE: 90 if (c == 0) 91 return (TRUE); 92 *addrp = target = malloc(nodesize); 93 if (target == NULL) { 94 (void) syslog(LOG_ERR, mem_err_msg_arr); 95 return (FALSE); 96 } 97 (void) memset(target, 0, nodesize); 98 break; 99 100 case XDR_FREE: 101 return (TRUE); 102 } 103 104 /* 105 * now we xdr each element of array 106 */ 107 for (i = 0; (i < c) && stat; i++) { 108 stat = (*elproc)(xdrs, target); 109 target += elsize; 110 } 111 112 /* 113 * the array may need freeing 114 */ 115 if (xdrs->x_op == XDR_FREE) { 116 free(*addrp); 117 *addrp = NULL; 118 } 119 return (stat); 120 } 121 122 /* 123 * xdr_vector(): 124 * 125 * XDR a fixed length array. Unlike variable-length arrays, 126 * the storage of fixed length arrays is static and unfreeable. 127 * > basep: base of the array 128 * > size: size of the array 129 * > elemsize: size of each element 130 * > xdr_elem: routine to XDR each element 131 */ 132 bool_t 133 xdr_vector(XDR *xdrs, char *basep, const uint_t nelem, 134 const uint_t elemsize, const xdrproc_t xdr_elem) 135 { 136 uint_t i; 137 char *elptr; 138 139 /* Make sure x_op contains a valid value */ 140 if (xdrs->x_op != XDR_ENCODE && 141 xdrs->x_op != XDR_DECODE && 142 xdrs->x_op != XDR_FREE) 143 return (FALSE); 144 145 elptr = basep; 146 for (i = 0; i < nelem; i++) { 147 if (!(*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) 148 return (FALSE); 149 elptr += elemsize; 150 } 151 return (TRUE); 152 } 153