rpc.subproj/xdr_mem.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 /*      $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $     */
  26
  27 /*
  28  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  29  * unrestricted use provided that this legend is included on all tape
  30  * media and as a part of the software program in whole or part.  Users
  31  * may copy or modify Sun RPC without charge, but are not authorized
  32  * to license or distribute it to anyone else except as part of a product or
  33  * program developed by the user.
  34  *
  35  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  36  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  37  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  38  *
  39  * Sun RPC is provided with no support and without any obligation on the
  40  * part of Sun Microsystems, Inc. to assist in its use, correction,
  41  * modification or enhancement.
  42  *
  43  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  44  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  45  * OR ANY PART THEREOF.
  46  *
  47  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  48  * or profits or other special, indirect and consequential damages, even if
  49  * Sun has been advised of the possibility of such damages.
  50  *
  51  * Sun Microsystems, Inc.
  52  * 2550 Garcia Avenue
  53  * Mountain View, California  94043
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char *sccsid = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  58 static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
  59 #endif
  60 #include "libinfo_common.h"
  61
  62 #include <sys/cdefs.h>
  63
  64 /*
  65  * xdr_mem.h, XDR implementation using memory buffers.
  66  *
  67  * Copyright (C) 1984, Sun Microsystems, Inc.
  68  *
  69  * If you have some data to be interpreted as external data representation
  70  * or to be converted to external data representation in a memory buffer,
  71  * then this is the package for you.
  72  *
  73  */
  74
  75 #include <sys/types.h>
  76 #include <stddef.h>
  77
  78 #include <netinet/in.h>
  79
  80 #include <string.h>
  81
  82 #include <rpc/types.h>
  83 #include <rpc/xdr.h>
  84
  85 #ifdef __LP64__
  86 #define xdrlong_t int
  87 #else
  88 #define xdrlong_t long
  89 #endif
  90
  91 static void xdrmem_destroy(XDR *);
  92 static bool_t xdrmem_getlong_aligned(XDR *, xdrlong_t *);
  93 static bool_t xdrmem_putlong_aligned(XDR *, const xdrlong_t *);
  94 static bool_t xdrmem_getlong_unaligned(XDR *, xdrlong_t *);
  95 static bool_t xdrmem_putlong_unaligned(XDR *, const xdrlong_t *);
  96 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
  97 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
  98 /* XXX: w/64-bit pointers, u_int not enough! */
  99 static u_int xdrmem_getpos(XDR *);
 100 static bool_t xdrmem_setpos(XDR *, u_int);
 101 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
 102 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
 103
 104 static const struct     xdr_ops xdrmem_ops_aligned = {
 105         xdrmem_getlong_aligned,
 106         xdrmem_putlong_aligned,
 107         xdrmem_getbytes,
 108         xdrmem_putbytes,
 109         xdrmem_getpos,
 110         xdrmem_setpos,
 111         xdrmem_inline_aligned,
 112         xdrmem_destroy
 113 };
 114
 115 static const struct     xdr_ops xdrmem_ops_unaligned = {
 116         xdrmem_getlong_unaligned,
 117         xdrmem_putlong_unaligned,
 118         xdrmem_getbytes,
 119         xdrmem_putbytes,
 120         xdrmem_getpos,
 121         xdrmem_setpos,
 122         xdrmem_inline_unaligned,
 123         xdrmem_destroy
 124 };
 125
 126 /*
 127  * The procedure xdrmem_create initializes a stream descriptor for a
 128  * memory buffer.
 129  */
 130 LIBINFO_EXPORT
 131 void
 132 xdrmem_create(xdrs, addr, size, op)
 133         XDR *xdrs;
 134         char *addr;
 135         u_int size;
 136         enum xdr_op op;
 137 {
 138         xdrs->x_op = op;
 139         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 140             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
 141         xdrs->x_private = xdrs->x_base = addr;
 142         xdrs->x_handy = size;
 143 }
 144
 145 /*ARGSUSED*/
 146 static void
 147 xdrmem_destroy(xdrs)
 148         XDR *xdrs;
 149 {
 150 }
 151
 152 static bool_t
 153 xdrmem_getlong_aligned(xdrs, lp)
 154         XDR *xdrs;
 155         xdrlong_t *lp;
 156 {
 157         if (xdrs->x_handy < sizeof(int32_t))
 158                 return (FALSE);
 159         xdrs->x_handy -= sizeof(int32_t);
 160         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 161         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 162         return (TRUE);
 163 }
 164
 165 static bool_t
 166 xdrmem_putlong_aligned(xdrs, lp)
 167         XDR *xdrs;
 168         const xdrlong_t *lp;
 169 {
 170         if (xdrs->x_handy < sizeof(int32_t))
 171                 return (FALSE);
 172         xdrs->x_handy -= sizeof(int32_t);
 173         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 174         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 175         return (TRUE);
 176 }
 177
 178 static bool_t
 179 xdrmem_getlong_unaligned(xdrs, lp)
 180         XDR *xdrs;
 181         xdrlong_t *lp;
 182 {
 183         u_int32_t l;
 184
 185         if (xdrs->x_handy < sizeof(int32_t))
 186                 return (FALSE);
 187         xdrs->x_handy -= sizeof(int32_t);
 188         memmove(&l, xdrs->x_private, sizeof(int32_t));
 189         *lp = ntohl(l);
 190         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 191         return (TRUE);
 192 }
 193
 194 static bool_t
 195 xdrmem_putlong_unaligned(xdrs, lp)
 196         XDR *xdrs;
 197         const xdrlong_t *lp;
 198 {
 199         u_int32_t l;
 200
 201         if (xdrs->x_handy < sizeof(int32_t))
 202                 return (FALSE);
 203         xdrs->x_handy -= sizeof(int32_t);
 204         l = htonl((u_int32_t)*lp);
 205         memmove(xdrs->x_private, &l, sizeof(int32_t));
 206         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 207         return (TRUE);
 208 }
 209
 210 static bool_t
 211 xdrmem_getbytes(xdrs, addr, len)
 212         XDR *xdrs;
 213         char *addr;
 214         u_int len;
 215 {
 216         if (xdrs->x_handy < len)
 217                 return (FALSE);
 218         xdrs->x_handy -= len;
 219         memmove(addr, xdrs->x_private, len);
 220         xdrs->x_private = (char *)xdrs->x_private + len;
 221         return (TRUE);
 222 }
 223
 224 static bool_t
 225 xdrmem_putbytes(xdrs, addr, len)
 226         XDR *xdrs;
 227         const char *addr;
 228         u_int len;
 229 {
 230         if (xdrs->x_handy < len)
 231                 return (FALSE);
 232         xdrs->x_handy -= len;
 233         memmove(xdrs->x_private, addr, len);
 234         xdrs->x_private = (char *)xdrs->x_private + len;
 235         return (TRUE);
 236 }
 237
 238 static u_int
 239 xdrmem_getpos(xdrs)
 240         XDR *xdrs;
 241 {
 242         ptrdiff_t delta;
 243         u_int val;
 244
 245         delta = xdrs->x_private - (void *)(xdrs->x_base);
 246 #ifdef __LP64__
 247         if (delta > UINT32_MAX) return -1;
 248 #endif
 249
 250         val = delta;
 251         return val;
 252 }
 253
 254 static bool_t
 255 xdrmem_setpos(xdrs, pos)
 256         XDR *xdrs;
 257         u_int pos;
 258 {
 259         ptrdiff_t delta;
 260         char *newaddr = xdrs->x_base + pos;
 261         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 262
 263         if (newaddr > lastaddr)
 264                 return (FALSE);
 265         xdrs->x_private = newaddr;
 266         delta = lastaddr - newaddr;
 267 #ifdef __LP64__
 268         if (delta > UINT32_MAX) return (FALSE);
 269 #endif
 270         xdrs->x_handy = delta;
 271         return (TRUE);
 272 }
 273
 274 static int32_t *
 275 xdrmem_inline_aligned(xdrs, len)
 276         XDR *xdrs;
 277         u_int len;
 278 {
 279         int32_t *buf = 0;
 280
 281         if (xdrs->x_handy >= len) {
 282                 xdrs->x_handy -= len;
 283                 buf = (int32_t *)xdrs->x_private;
 284                 xdrs->x_private = (char *)xdrs->x_private + len;
 285         }
 286         return (buf);
 287 }
 288
 289 /* ARGSUSED */
 290 static int32_t *
 291 xdrmem_inline_unaligned(xdrs, len)
 292         XDR *xdrs;
 293         u_int len;
 294 {
 295         return (0);
 296 }