1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * xdr_sizeof.c 35 * 36 * General purpose routine to see how much space something will use 37 * when serialized using XDR. 38 */ 39 40 #include "namespace.h" 41 #include <rpc/types.h> 42 #include <rpc/xdr.h> 43 #include <sys/types.h> 44 #include <stdlib.h> 45 #include "un-namespace.h" 46 47 /* ARGSUSED */ 48 static bool_t 49 x_putlong(XDR *xdrs, const long *longp) 50 { 51 xdrs->x_handy += BYTES_PER_XDR_UNIT; 52 return (TRUE); 53 } 54 55 /* ARGSUSED */ 56 static bool_t 57 x_putbytes(XDR *xdrs, const char *bp, u_int len) 58 { 59 xdrs->x_handy += len; 60 return (TRUE); 61 } 62 63 static u_int 64 x_getpostn(XDR *xdrs) 65 { 66 return (xdrs->x_handy); 67 } 68 69 /* ARGSUSED */ 70 static bool_t 71 x_setpostn(XDR *xdrs, u_int pos) 72 { 73 /* This is not allowed */ 74 return (FALSE); 75 } 76 77 static int32_t * 78 x_inline(XDR *xdrs, u_int len) 79 { 80 if (len == 0) { 81 return (NULL); 82 } 83 if (xdrs->x_op != XDR_ENCODE) { 84 return (NULL); 85 } 86 if (len < (u_int)(uintptr_t)xdrs->x_base) { 87 /* x_private was already allocated */ 88 xdrs->x_handy += len; 89 return ((int32_t *) xdrs->x_private); 90 } else { 91 /* Free the earlier space and allocate new area */ 92 if (xdrs->x_private) 93 free(xdrs->x_private); 94 if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) { 95 xdrs->x_base = 0; 96 return (NULL); 97 } 98 xdrs->x_base = (caddr_t)(uintptr_t)len; 99 xdrs->x_handy += len; 100 return ((int32_t *) xdrs->x_private); 101 } 102 } 103 104 static int 105 harmless(void) 106 { 107 /* Always return FALSE/NULL, as the case may be */ 108 return (0); 109 } 110 111 static void 112 x_destroy(XDR *xdrs) 113 { 114 xdrs->x_handy = 0; 115 xdrs->x_base = 0; 116 if (xdrs->x_private) { 117 free(xdrs->x_private); 118 xdrs->x_private = NULL; 119 } 120 return; 121 } 122 123 unsigned long 124 xdr_sizeof(xdrproc_t func, void *data) 125 { 126 XDR x; 127 struct xdr_ops ops; 128 bool_t stat; 129 /* to stop ANSI-C compiler from complaining */ 130 typedef bool_t (* dummyfunc1)(XDR *, long *); 131 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 132 133 ops.x_putlong = x_putlong; 134 ops.x_putbytes = x_putbytes; 135 ops.x_inline = x_inline; 136 ops.x_getpostn = x_getpostn; 137 ops.x_setpostn = x_setpostn; 138 ops.x_destroy = x_destroy; 139 140 /* the other harmless ones */ 141 ops.x_getlong = (dummyfunc1) harmless; 142 ops.x_getbytes = (dummyfunc2) harmless; 143 144 x.x_op = XDR_ENCODE; 145 x.x_ops = &ops; 146 x.x_handy = 0; 147 x.x_private = (caddr_t) NULL; 148 x.x_base = (caddr_t) 0; 149 150 stat = func(&x, data); 151 if (x.x_private) 152 free(x.x_private); 153 return (stat == TRUE ? (unsigned) x.x_handy: 0); 154 } 155