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  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  28  * Copyright 2017 RackTop Systems.
  29  */
  30 
  31 #include <rpc/types.h>
  32 #include <rpc/xdr.h>
  33 #include <sys/types.h>
  34 
  35 /* ARGSUSED */
  36 static bool_t
  37 x_putint32_t(XDR *xdrs, int32_t *ip)
  38 {
  39         xdrs->x_handy += BYTES_PER_XDR_UNIT;
  40         return (TRUE);
  41 }
  42 
  43 /* ARGSUSED */
  44 static bool_t
  45 x_putbytes(XDR *xdrs, char *bp, int len)
  46 {
  47         xdrs->x_handy += len;
  48         return (TRUE);
  49 }
  50 
  51 static uint_t
  52 x_getpostn(XDR *xdrs)
  53 {
  54         return (xdrs->x_handy);
  55 }
  56 
  57 /* ARGSUSED */
  58 static bool_t
  59 x_setpostn(XDR *xdrs, uint_t pos)
  60 {
  61         /* This is not allowed */
  62         return (FALSE);
  63 }
  64 
  65 static rpc_inline_t *
  66 x_inline(XDR *xdrs, int len)
  67 {
  68         if (len == 0) {
  69                 return (NULL);
  70         }
  71         if (xdrs->x_op != XDR_ENCODE) {
  72                 return (NULL);
  73         }
  74         if (len < (uintptr_t)xdrs->x_base) {
  75                 /* x_private was already allocated */
  76                 xdrs->x_handy += len;
  77                 return ((rpc_inline_t *)xdrs->x_private);
  78         } else {
  79                 /* Free the earlier space and allocate new area */
  80                 if (xdrs->x_private)
  81                         mem_free(xdrs->x_private, (uintptr_t)xdrs->x_base);
  82                 if ((xdrs->x_private = (caddr_t)mem_alloc(len)) == NULL) {
  83                         xdrs->x_base = 0;
  84                         return (NULL);
  85                 }
  86                 xdrs->x_base = (caddr_t)(uintptr_t)len;
  87                 xdrs->x_handy += len;
  88                 return ((rpc_inline_t *)xdrs->x_private);
  89         }
  90 }
  91 
  92 static int
  93 harmless()
  94 {
  95         /* Always return FALSE/NULL, as the case may be */
  96         return (0);
  97 }
  98 
  99 static void
 100 x_destroy(XDR *xdrs)
 101 {
 102         xdrs->x_handy = 0;
 103         if (xdrs->x_private) {
 104                 mem_free(xdrs->x_private, (uintptr_t)xdrs->x_base);
 105                 xdrs->x_private = NULL;
 106         }
 107         xdrs->x_base = 0;
 108 }
 109 
 110 unsigned int
 111 xdr_sizeof(xdrproc_t func, void *data)
 112 {
 113         XDR x;
 114         struct xdr_ops ops;
 115         bool_t stat;
 116         /* to stop ANSI-C compiler from complaining */
 117         typedef  bool_t (* dummyfunc1)(XDR *, caddr_t, int);
 118         typedef  bool_t (* dummyfunc2)(XDR *, int, void *);
 119 #if defined(_LP64) || defined(_KERNEL)
 120         typedef  bool_t (* dummyfunc3)(XDR *, int32_t *);
 121 #endif
 122 
 123         ops.x_putbytes = x_putbytes;
 124         ops.x_inline = x_inline;
 125         ops.x_getpostn = x_getpostn;
 126         ops.x_setpostn = x_setpostn;
 127         ops.x_destroy = x_destroy;
 128 
 129 #if defined(_LP64) || defined(_KERNEL)
 130         ops.x_getint32 = (dummyfunc3)harmless;
 131         ops.x_putint32 = x_putint32_t;
 132 #endif
 133 
 134         /* the other harmless ones */
 135         ops.x_getbytes = (dummyfunc1)harmless;
 136         ops.x_control = (dummyfunc2)harmless;
 137 
 138         x.x_op = XDR_ENCODE;
 139         x.x_ops = &ops;
 140         x.x_handy = 0;
 141         x.x_private = (caddr_t)NULL;
 142         x.x_base = NULL;
 143 
 144         stat = func(&x, data);
 145         if (x.x_private)
 146                 mem_free(x.x_private, (uintptr_t)x.x_base);
 147         return (stat == TRUE ? (unsigned int)x.x_handy: 0);
 148 }