1 /* 2 * Copyright (c) 2010, Oracle America, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following 12 * disclaimer in the documentation and/or other materials 13 * provided with the distribution. 14 * * Neither the name of the "Oracle America, Inc." nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 25 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /* 32 * xdr_sizeof.c 33 * 34 * Copyright 1990 Sun Microsystems, Inc. 35 * 36 * General purpose routine to see how much space something will use 37 * when serialized using XDR. 38 */ 39 40 #include <sys/cdefs.h> 41 #if 0 42 __FBSDID("$FreeBSD: src/lib/libc/xdr/xdr_sizeof.c,v 1.5.38.1 2010/12/21 17:10:29 kensmith Exp $"); 43 #else 44 __RCSID("$NetBSD: xdr_sizeof.c,v 1.5 2013/03/11 20:19:30 tron Exp $"); 45 #endif 46 47 #include "namespace.h" 48 #include <rpc/types.h> 49 #include <rpc/xdr.h> 50 #include <sys/types.h> 51 #include <stdlib.h> 52 53 #ifdef __weak_alias 54 __weak_alias(xdr_sizeof,_xdr_sizeof) 55 #endif 56 57 static bool_t x_putlong(XDR *, const long *); 58 static bool_t x_putbytes(XDR *, const char *, u_int); 59 static u_int x_getpostn(XDR *); 60 static bool_t x_setpostn(XDR *, u_int); 61 static int32_t *x_inline(XDR *, u_int); 62 static int harmless(void); 63 static void x_destroy(XDR *); 64 65 /* ARGSUSED */ 66 static bool_t 67 x_putlong(XDR *xdrs, const long *longp) 68 { 69 xdrs->x_handy += BYTES_PER_XDR_UNIT; 70 return (TRUE); 71 } 72 73 /* ARGSUSED */ 74 static bool_t 75 x_putbytes(XDR *xdrs, const char *bp, u_int len) 76 { 77 xdrs->x_handy += len; 78 return (TRUE); 79 } 80 81 static u_int 82 x_getpostn(XDR *xdrs) 83 { 84 return (xdrs->x_handy); 85 } 86 87 /* ARGSUSED */ 88 static bool_t 89 x_setpostn(XDR *xdrs, u_int pos) 90 { 91 /* This is not allowed */ 92 return (FALSE); 93 } 94 95 static int32_t * 96 x_inline(XDR *xdrs, u_int len) 97 { 98 if (len == 0) { 99 return (NULL); 100 } 101 if (xdrs->x_op != XDR_ENCODE) { 102 return (NULL); 103 } 104 if (len < (u_int)(uintptr_t)xdrs->x_base) { 105 /* x_private was already allocated */ 106 xdrs->x_handy += len; 107 return ((int32_t *) xdrs->x_private); 108 } else { 109 /* Free the earlier space and allocate new area */ 110 if (xdrs->x_private) 111 free(xdrs->x_private); 112 if ((xdrs->x_private = malloc(len)) == NULL) { 113 xdrs->x_base = 0; 114 return (NULL); 115 } 116 xdrs->x_base = (caddr_t)(uintptr_t)len; 117 xdrs->x_handy += len; 118 return ((int32_t *) xdrs->x_private); 119 } 120 } 121 122 static int 123 harmless(void) 124 { 125 /* Always return FALSE/NULL, as the case may be */ 126 return (0); 127 } 128 129 static void 130 x_destroy(XDR *xdrs) 131 { 132 xdrs->x_handy = 0; 133 xdrs->x_base = 0; 134 if (xdrs->x_private) { 135 free(xdrs->x_private); 136 xdrs->x_private = NULL; 137 } 138 return; 139 } 140 141 unsigned long 142 xdr_sizeof(xdrproc_t func, void *data) 143 { 144 XDR x; 145 struct xdr_ops ops; 146 bool_t stat; 147 /* to stop ANSI-C compiler from complaining */ 148 typedef bool_t (* dummyfunc1)(XDR *, long *); 149 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 150 151 ops.x_putlong = x_putlong; 152 ops.x_putbytes = x_putbytes; 153 ops.x_inline = x_inline; 154 ops.x_getpostn = x_getpostn; 155 ops.x_setpostn = x_setpostn; 156 ops.x_destroy = x_destroy; 157 158 /* the other harmless ones */ 159 ops.x_getlong = (dummyfunc1) harmless; 160 ops.x_getbytes = (dummyfunc2) harmless; 161 162 x.x_op = XDR_ENCODE; 163 x.x_ops = &ops; 164 x.x_handy = 0; 165 x.x_private = (caddr_t) NULL; 166 x.x_base = (caddr_t) 0; 167 168 stat = func(&x, data); 169 if (x.x_private) 170 free(x.x_private); 171 return (stat == TRUE ? (unsigned) x.x_handy: 0); 172 } 173