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