sunrpc/xdr_stdio.c

   1 /*
   2  * xdr_stdio.c, XDR implementation on standard i/o file.
   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  * This set of routines implements a XDR on a stdio stream.
  34  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  35  * from the stream.
  36  */
  37
  38 #include <rpc/types.h>
  39 #include <stdio.h>
  40 #include <rpc/xdr.h>
  41
  42 #include <libio/iolibio.h>
  43 #include <shlib-compat.h>
  44
  45 #define fflush(s) _IO_fflush (s)
  46 #define fread(p, m, n, s) _IO_fread (p, m, n, s)
  47 #define ftell(s) _IO_ftell (s)
  48 #define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s)
  49
  50 static bool_t xdrstdio_getlong (XDR *, long *);
  51 static bool_t xdrstdio_putlong (XDR *, const long *);
  52 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
  53 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
  54 static u_int xdrstdio_getpos (const XDR *);
  55 static bool_t xdrstdio_setpos (XDR *, u_int);
  56 static int32_t *xdrstdio_inline (XDR *, u_int);
  57 static void xdrstdio_destroy (XDR *);
  58 static bool_t xdrstdio_getint32 (XDR *, int32_t *);
  59 static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
  60
  61 /*
  62  * Ops vector for stdio type XDR
  63  */
  64 static const struct xdr_ops xdrstdio_ops =
  65 {
  66   xdrstdio_getlong,             /* deserialize a long int */
  67   xdrstdio_putlong,             /* serialize a long int */
  68   xdrstdio_getbytes,            /* deserialize counted bytes */
  69   xdrstdio_putbytes,            /* serialize counted bytes */
  70   xdrstdio_getpos,              /* get offset in the stream */
  71   xdrstdio_setpos,              /* set offset in the stream */
  72   xdrstdio_inline,              /* prime stream for inline macros */
  73   xdrstdio_destroy,             /* destroy stream */
  74   xdrstdio_getint32,            /* deserialize a int */
  75   xdrstdio_putint32             /* serialize a int */
  76 };
  77
  78 /*
  79  * Initialize a stdio xdr stream.
  80  * Sets the xdr stream handle xdrs for use on the stream file.
  81  * Operation flag is set to op.
  82  */
  83 void
  84 xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op)
  85 {
  86   xdrs->x_op = op;
  87   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
  88      is not `const'.  */
  89   xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
  90   xdrs->x_private = (caddr_t) file;
  91   xdrs->x_handy = 0;
  92   xdrs->x_base = 0;
  93 }
  94
  95 /*
  96  * Destroy a stdio xdr stream.
  97  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
  98  */
  99 static void
 100 xdrstdio_destroy (XDR *xdrs)
 101 {
 102   (void) fflush ((FILE *) xdrs->x_private);
 103   /* xx should we close the file ?? */
 104 };
 105
 106 static bool_t
 107 xdrstdio_getlong (XDR *xdrs, long *lp)
 108 {
 109   uint32_t mycopy;
 110
 111   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 112     return FALSE;
 113   *lp = (long) ntohl (mycopy);
 114   return TRUE;
 115 }
 116
 117 static bool_t
 118 xdrstdio_putlong (XDR *xdrs, const long *lp)
 119 {
 120   int32_t mycopy = htonl ((uint32_t) *lp);
 121
 122   if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 123     return FALSE;
 124   return TRUE;
 125 }
 126
 127 static bool_t
 128 xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len)
 129 {
 130   if ((len != 0) && (fread (addr, (int) len, 1,
 131                             (FILE *) xdrs->x_private) != 1))
 132     return FALSE;
 133   return TRUE;
 134 }
 135
 136 static bool_t
 137 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
 138 {
 139   if ((len != 0) && (fwrite (addr, (int) len, 1,
 140                              (FILE *) xdrs->x_private) != 1))
 141     return FALSE;
 142   return TRUE;
 143 }
 144
 145 static u_int
 146 xdrstdio_getpos (const XDR *xdrs)
 147 {
 148   return (u_int) ftell ((FILE *) xdrs->x_private);
 149 }
 150
 151 static bool_t
 152 xdrstdio_setpos (XDR *xdrs, u_int pos)
 153 {
 154   return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
 155 }
 156
 157 static int32_t *
 158 xdrstdio_inline (XDR *xdrs, u_int len)
 159 {
 160   /*
 161    * Must do some work to implement this: must insure
 162    * enough data in the underlying stdio buffer,
 163    * that the buffer is aligned so that we can indirect through a
 164    * long *, and stuff this pointer in xdrs->x_buf.  Doing
 165    * a fread or fwrite to a scratch buffer would defeat
 166    * most of the gains to be had here and require storage
 167    * management on this buffer, so we don't do this.
 168    */
 169   return NULL;
 170 }
 171
 172 static bool_t
 173 xdrstdio_getint32 (XDR *xdrs, int32_t *ip)
 174 {
 175   int32_t mycopy;
 176
 177   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 178     return FALSE;
 179   *ip = ntohl (mycopy);
 180   return TRUE;
 181 }
 182
 183 static bool_t
 184 xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)
 185 {
 186   int32_t mycopy = htonl (*ip);
 187
 188   ip = &mycopy;
 189   if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)
 190     return FALSE;
 191   return TRUE;
 192 }
 193 #ifdef EXPORT_RPC_SYMBOLS
 194 libc_hidden_def (xdrstdio_create)
 195 #else
 196 libc_hidden_nolink_sunrpc (xdrstdio_create, GLIBC_2_0)
 197 #endif