sunrpc/xdr_array.c

   1 /*
   2  * xdr_array.c, Generic XDR routines implementation.
   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  * These are the "non-trivial" xdr primitives used to serialize and
  34  * de-serialize arrays.  See xdr.h for more info on the interface to xdr.
  35  */
  36
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <rpc/types.h>
  40 #include <rpc/xdr.h>
  41 #include <libintl.h>
  42 #include <limits.h>
  43 #include <wchar.h>
  44
  45 #define LASTUNSIGNED    ((u_int)0-1)
  46
  47
  48 /*
  49  * XDR an array of arbitrary elements
  50  * *addrp is a pointer to the array, *sizep is the number of elements.
  51  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  52  * elsize is the size (in bytes) of each element, and elproc is the
  53  * xdr procedure to call to handle each element of the array.
  54  */
  55 bool_t
  56 xdr_array (xdrs, addrp, sizep, maxsize, elsize, elproc)
  57      XDR *xdrs;
  58      caddr_t *addrp;            /* array pointer */
  59      u_int *sizep;              /* number of elements */
  60      u_int maxsize;             /* max numberof elements */
  61      u_int elsize;              /* size in bytes of each element */
  62      xdrproc_t elproc;          /* xdr routine to handle each element */
  63 {
  64   u_int i;
  65   caddr_t target = *addrp;
  66   u_int c;              /* the actual element count */
  67   bool_t stat = TRUE;
  68
  69   /* like strings, arrays are really counted arrays */
  70   if (!xdr_u_int (xdrs, sizep))
  71     {
  72       return FALSE;
  73     }
  74   c = *sizep;
  75   /*
  76    * XXX: Let the overflow possibly happen with XDR_FREE because mem_free()
  77    * doesn't actually use its second argument anyway.
  78    */
  79   if ((c > maxsize || c > UINT_MAX / elsize) && (xdrs->x_op != XDR_FREE))
  80     {
  81       return FALSE;
  82     }
  83
  84   /*
  85    * if we are deserializing, we may need to allocate an array.
  86    * We also save time by checking for a null array if we are freeing.
  87    */
  88   if (target == NULL)
  89     switch (xdrs->x_op)
  90       {
  91       case XDR_DECODE:
  92         if (c == 0)
  93           return TRUE;
  94         *addrp = target = calloc (c, elsize);
  95         if (target == NULL)
  96           {
  97             (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
  98             return FALSE;
  99           }
 100         break;
 101
 102       case XDR_FREE:
 103         return TRUE;
 104       default:
 105         break;
 106       }
 107
 108   /*
 109    * now we xdr each element of array
 110    */
 111   for (i = 0; (i < c) && stat; i++)
 112     {
 113       stat = (*elproc) (xdrs, target, LASTUNSIGNED);
 114       target += elsize;
 115     }
 116
 117   /*
 118    * the array may need freeing
 119    */
 120   if (xdrs->x_op == XDR_FREE)
 121     {
 122       mem_free (*addrp, c * elsize);
 123       *addrp = NULL;
 124     }
 125   return stat;
 126 }
 127 #ifdef EXPORT_RPC_SYMBOLS
 128 libc_hidden_def (xdr_array)
 129 #else
 130 libc_hidden_nolink_sunrpc (xdr_array, GLIBC_2_0)
 131 #endif
 132
 133 /*
 134  * xdr_vector():
 135  *
 136  * XDR a fixed length array. Unlike variable-length arrays,
 137  * the storage of fixed length arrays is static and unfreeable.
 138  * > basep: base of the array
 139  * > size: size of the array
 140  * > elemsize: size of each element
 141  * > xdr_elem: routine to XDR each element
 142  */
 143 bool_t
 144 xdr_vector (xdrs, basep, nelem, elemsize, xdr_elem)
 145      XDR *xdrs;
 146      char *basep;
 147      u_int nelem;
 148      u_int elemsize;
 149      xdrproc_t xdr_elem;
 150 {
 151   u_int i;
 152   char *elptr;
 153
 154   elptr = basep;
 155   for (i = 0; i < nelem; i++)
 156     {
 157       if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
 158         {
 159           return FALSE;
 160         }
 161       elptr += elemsize;
 162     }
 163   return TRUE;
 164 }
 165 libc_hidden_nolink_sunrpc (xdr_vector, GLIBC_2_0)