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 * "pointers". See xdr.h for more info on the interface to xdr. 41 */ 42 #include "mt.h" 43 #include <sys/types.h> 44 #include <syslog.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <rpc/types.h> 48 #include <rpc/xdr.h> 49 #include <memory.h> 50 51 #define LASTUNSIGNED ((uint_t)0-1) 52 char mem_err_msg_ref[] = "xdr_reference: out of memory"; 53 54 /* 55 * XDR an indirect pointer 56 * xdr_reference is for recursively translating a structure that is 57 * referenced by a pointer inside the structure that is currently being 58 * translated. pp references a pointer to storage. If *pp is null 59 * the necessary storage is allocated. 60 * size is the sizeof the referneced structure. 61 * proc is the routine to handle the referenced structure. 62 */ 63 bool_t 64 xdr_reference(XDR *xdrs, caddr_t *pp, uint_t size, const xdrproc_t proc) 65 { 66 caddr_t loc = *pp; 67 bool_t stat; 68 69 /* Make sure x_op contains a valid value */ 70 if (xdrs->x_op != XDR_ENCODE && 71 xdrs->x_op != XDR_DECODE && 72 xdrs->x_op != XDR_FREE) 73 return (FALSE); 74 75 if (loc == NULL) 76 switch (xdrs->x_op) { 77 case XDR_FREE: 78 return (TRUE); 79 case XDR_DECODE: 80 *pp = loc = malloc(size); 81 if (loc == NULL) { 82 (void) syslog(LOG_ERR, mem_err_msg_ref); 83 return (FALSE); 84 } 85 (void) memset(loc, 0, (int)size); 86 break; 87 } 88 89 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 90 91 if (xdrs->x_op == XDR_FREE) { 92 free(loc); 93 *pp = NULL; 94 } 95 return (stat); 96 } 97 98 99 /* 100 * xdr_pointer(): 101 * 102 * XDR a pointer to a possibly recursive data structure. This 103 * differs with xdr_reference in that it can serialize/deserialiaze 104 * trees correctly. 105 * 106 * What's sent is actually a union: 107 * 108 * union object_pointer switch (boolean b) { 109 * case TRUE: object_data data; 110 * case FALSE: void nothing; 111 * } 112 * 113 * > objpp: Pointer to the pointer to the object. 114 * > obj_size: size of the object. 115 * > xdr_obj: routine to XDR an object. 116 * 117 */ 118 bool_t 119 xdr_pointer(XDR *xdrs, char **objpp, uint_t obj_size, const xdrproc_t xdr_obj) 120 { 121 bool_t more_data; 122 123 more_data = (*objpp != NULL); 124 if (!xdr_bool(xdrs, &more_data)) 125 return (FALSE); 126 if (!more_data) { 127 *objpp = NULL; 128 return (TRUE); 129 } 130 return (xdr_reference(xdrs, objpp, obj_size, xdr_obj)); 131 } 132