OSX/libsecurityd/lib/sec_xdrmem.c

   1 /*
   2  * Copyright (c) 2006,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*      $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $     */
  25
  26 /*
  27  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  28  * unrestricted use provided that this legend is included on all tape
  29  * media and as a part of the software program in whole or part.  Users
  30  * may copy or modify Sun RPC without charge, but are not authorized
  31  * to license or distribute it to anyone else except as part of a product or
  32  * program developed by the user.
  33  *
  34  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  35  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  36  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  37  *
  38  * Sun RPC is provided with no support and without any obligation on the
  39  * part of Sun Microsystems, Inc. to assist in its use, correction,
  40  * modification or enhancement.
  41  *
  42  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  43  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  44  * OR ANY PART THEREOF.
  45  *
  46  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  47  * or profits or other special, indirect and consequential damages, even if
  48  * Sun has been advised of the possibility of such damages.
  49  *
  50  * Sun Microsystems, Inc.
  51  * 2550 Garcia Avenue
  52  * Mountain View, California  94043
  53  */
  54
  55 #if defined(LIBC_SCCS) && !defined(lint)
  56 static char *sccsid = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  57 static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
  58 #endif
  59 #include <sys/cdefs.h>
  60
  61 /*
  62  * xdr_mem.h, XDR implementation using memory buffers.
  63  *
  64  * Copyright (C) 1984, Sun Microsystems, Inc.
  65  *
  66  * If you have some data to be interpreted as external data representation
  67  * or to be converted to external data representation in a memory buffer,
  68  * then this is the package for you.
  69  *
  70  */
  71
  72 #include <sys/types.h>
  73
  74 #include <netinet/in.h>
  75
  76 #include <string.h>
  77
  78 #include "sec_xdr.h"
  79
  80 static void sec_xdrmem_destroy(XDR *);
  81
  82 #ifdef __LP64__
  83 #define long_callback_ptr_t int *
  84 #else
  85 #define long_callback_ptr_t long *
  86 #endif
  87 static bool_t sec_xdrmem_getlong_aligned(XDR *, long_callback_ptr_t);
  88 static bool_t sec_xdrmem_putlong_aligned(XDR *, const long_callback_ptr_t);
  89 static bool_t sec_xdrmem_getlong_unaligned(XDR *, long_callback_ptr_t);
  90 static bool_t sec_xdrmem_putlong_unaligned(XDR *, const long_callback_ptr_t);
  91
  92 static bool_t sec_xdrmem_getbytes(XDR *, char *, u_int);
  93 static bool_t sec_xdrmem_putbytes(XDR *, const char *, u_int);
  94 /* XXX: w/64-bit pointers, u_int not enough! */
  95 static u_int sec_xdrmem_getpos(XDR *);
  96 static bool_t sec_xdrmem_setpos(XDR *, u_int);
  97 static int32_t *sec_xdrmem_inline_aligned(XDR *, u_int);
  98 static int32_t *sec_xdrmem_inline_unaligned(XDR *, u_int);
  99
 100 static const struct     xdr_ops sec_xdrmem_ops_aligned = {
 101     sec_xdrmem_getlong_aligned,
 102     sec_xdrmem_putlong_aligned,
 103     sec_xdrmem_getbytes,
 104     sec_xdrmem_putbytes,
 105     sec_xdrmem_getpos,
 106     sec_xdrmem_setpos,
 107     sec_xdrmem_inline_aligned,
 108     sec_xdrmem_destroy
 109 };
 110
 111 static const struct     xdr_ops sec_xdrmem_ops_unaligned = {
 112     sec_xdrmem_getlong_unaligned,
 113     sec_xdrmem_putlong_unaligned,
 114     sec_xdrmem_getbytes,
 115     sec_xdrmem_putbytes,
 116     sec_xdrmem_getpos,
 117     sec_xdrmem_setpos,
 118     sec_xdrmem_inline_unaligned,
 119     sec_xdrmem_destroy
 120 };
 121
 122 /*
 123  * The procedure sec_xdrmem_create initializes a stream descriptor for a
 124  * memory buffer.
 125  */
 126 void
 127 sec_xdrmem_create(xdrs, addr, size, op)
 128         XDR *xdrs;
 129         char *addr;
 130         u_int size;
 131         enum xdr_op op;
 132 {
 133     xdrs->x_op = op;
 134     xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 135         ? &sec_xdrmem_ops_unaligned : &sec_xdrmem_ops_aligned;
 136     xdrs->x_private = xdrs->x_base = addr;
 137     xdrs->x_public = NULL;
 138     xdrs->x_handy = size;
 139 }
 140
 141 /*ARGSUSED*/
 142 static void
 143 sec_xdrmem_destroy(xdrs)
 144         XDR *xdrs;
 145 {
 146
 147 }
 148
 149 static bool_t
 150 sec_xdrmem_getlong_aligned(xdrs, lp)
 151         XDR *xdrs;
 152         long_callback_ptr_t lp;
 153 {
 154     if (xdrs->x_handy < sizeof(int32_t))
 155         return (FALSE);
 156     xdrs->x_handy -= sizeof(int32_t);
 157     if (lp) *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 158     xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 159     return (TRUE);
 160 }
 161
 162 static bool_t
 163 sec_xdrmem_putlong_aligned(xdrs, lp)
 164         XDR *xdrs;
 165         const long_callback_ptr_t lp;
 166 {
 167     if (xdrs->x_handy < sizeof(int32_t))
 168         return (FALSE);
 169     xdrs->x_handy -= sizeof(int32_t);
 170     if (lp) *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 171     xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 172     return (TRUE);
 173 }
 174
 175 static bool_t
 176 sec_xdrmem_getlong_unaligned(xdrs, lp)
 177         XDR *xdrs;
 178         long_callback_ptr_t lp;
 179 {
 180     u_int32_t l;
 181
 182     if (xdrs->x_handy < sizeof(int32_t))
 183         return (FALSE);
 184     xdrs->x_handy -= sizeof(int32_t);
 185     memmove(&l, xdrs->x_private, sizeof(int32_t));
 186     if (lp) *lp = ntohl(l);
 187     xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 188     return (TRUE);
 189 }
 190
 191 static bool_t
 192 sec_xdrmem_putlong_unaligned(xdrs, lp)
 193         XDR *xdrs;
 194         const long_callback_ptr_t lp;
 195 {
 196     u_int32_t l = 0;
 197
 198     if (xdrs->x_handy < sizeof(int32_t))
 199         return (FALSE);
 200     xdrs->x_handy -= sizeof(int32_t);
 201     if (lp) l = htonl((u_int32_t)*lp);
 202     memmove(xdrs->x_private, &l, sizeof(int32_t));
 203     xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 204     return (TRUE);
 205 }
 206
 207 static bool_t
 208 sec_xdrmem_getbytes(xdrs, addr, len)
 209         XDR *xdrs;
 210         char *addr;
 211         u_int len;
 212 {
 213     if (xdrs->x_handy < len)
 214         return (FALSE);
 215     xdrs->x_handy -= len;
 216     if (addr) memmove(addr, xdrs->x_private, len);
 217     xdrs->x_private = (char *)xdrs->x_private + len;
 218     return (TRUE);
 219 }
 220
 221 static bool_t
 222 sec_xdrmem_putbytes(xdrs, addr, len)
 223         XDR *xdrs;
 224         const char *addr;
 225         u_int len;
 226 {
 227     if (xdrs->x_handy < len)
 228         return (FALSE);
 229     xdrs->x_handy -= len;
 230     if (addr) memmove(xdrs->x_private, addr, len);
 231     xdrs->x_private = (char *)xdrs->x_private + len;
 232     return (TRUE);
 233 }
 234
 235 static u_int
 236 sec_xdrmem_getpos(xdrs)
 237         XDR *xdrs;
 238 {
 239     /* XXX w/64-bit pointers, u_int not enough! */
 240     return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
 241 }
 242
 243 static bool_t
 244 sec_xdrmem_setpos(xdrs, pos)
 245         XDR *xdrs;
 246         u_int pos;
 247 {
 248     char *newaddr = xdrs->x_base + pos;
 249     char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 250
 251     if (newaddr > lastaddr)
 252         return (FALSE);
 253     xdrs->x_private = newaddr;
 254     xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
 255     return (TRUE);
 256 }
 257
 258 static int32_t *
 259 sec_xdrmem_inline_aligned(xdrs, len)
 260         XDR *xdrs;
 261         u_int len;
 262 {
 263     int32_t *buf = 0;
 264
 265     if (xdrs->x_handy >= len) {
 266         xdrs->x_handy -= len;
 267         buf = (int32_t *)xdrs->x_private;
 268         xdrs->x_private = (char *)xdrs->x_private + len;
 269     }
 270     return (buf);
 271 }
 272
 273 /* ARGSUSED */
 274 static int32_t *
 275 sec_xdrmem_inline_unaligned(xdrs, len)
 276         XDR *xdrs;
 277         u_int len;
 278 {
 279     return (0);
 280 }
 281
 282 /**
 283  * This is almost a straight copy of the standard implementation, except
 284  * that all calls made that move memory don't do so if passed a NULL dest.
 285  * getbytes in particular when called from xdr_bytes during sizing of a decode
 286  * needs this.
 287  */