1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
|
/*
* xdr_mem.c, XDR implementation using memory buffers.
*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* If you have some data to be interpreted as external data representation
* or to be converted to external data representation in a memory buffer,
* then this is the package for you.
*/
#include <string.h>
#include <limits.h>
#include <rpc/rpc.h>
#include <shlib-compat.h>
static bool_t xdrmem_getlong (XDR *, long *);
static bool_t xdrmem_putlong (XDR *, const long *);
static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
static u_int xdrmem_getpos (const XDR *);
static bool_t xdrmem_setpos (XDR *, u_int);
static int32_t *xdrmem_inline (XDR *, u_int);
static void xdrmem_destroy (XDR *);
static bool_t xdrmem_getint32 (XDR *, int32_t *);
static bool_t xdrmem_putint32 (XDR *, const int32_t *);
static const struct xdr_ops xdrmem_ops =
{
xdrmem_getlong,
xdrmem_putlong,
xdrmem_getbytes,
xdrmem_putbytes,
xdrmem_getpos,
xdrmem_setpos,
xdrmem_inline,
xdrmem_destroy,
xdrmem_getint32,
xdrmem_putint32
};
/*
* The procedure xdrmem_create initializes a stream descriptor for a
* memory buffer.
*/
void
xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
{
xdrs->x_op = op;
/* We have to add the const since the `struct xdr_ops' in `struct XDR'
is not `const'. */
xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
xdrs->x_private = xdrs->x_base = addr;
xdrs->x_handy = size;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (xdrmem_create)
#else
libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0)
#endif
/*
* Nothing needs to be done for the memory case. The argument is clearly
* const.
*/
static void
xdrmem_destroy (XDR *xdrs)
{
}
/*
* Gets the next word from the memory referenced by xdrs and places it
* in the long pointed to by lp. It then increments the private word to
* point at the next element. Neither object pointed to is const
*/
static bool_t
xdrmem_getlong (XDR *xdrs, long *lp)
{
if (xdrs->x_handy < 4)
return FALSE;
xdrs->x_handy -= 4;
*lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
xdrs->x_private += 4;
return TRUE;
}
/*
* Puts the long pointed to by lp in the memory referenced by xdrs. It
* then increments the private word to point at the next element. The
* long pointed at is const
*/
static bool_t
xdrmem_putlong (XDR *xdrs, const long *lp)
{
if (xdrs->x_handy < 4)
return FALSE;
xdrs->x_handy -= 4;
*(int32_t *) xdrs->x_private = htonl (*lp);
xdrs->x_private += 4;
return TRUE;
}
/*
* Gets an unaligned number of bytes from the xdrs structure and writes them
* to the address passed in addr. Be very careful when calling this routine
* as it could leave the xdrs pointing to an unaligned structure which is not
* a good idea. None of the things pointed to are const.
*/
static bool_t
xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
{
if (xdrs->x_handy < len)
return FALSE;
xdrs->x_handy -= len;
memcpy (addr, xdrs->x_private, len);
xdrs->x_private += len;
return TRUE;
}
/*
* The complementary function to the above. The same warnings apply about
* unaligned data. The source address is const.
*/
static bool_t
xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
{
if (xdrs->x_handy < len)
return FALSE;
xdrs->x_handy -= len;
memcpy (xdrs->x_private, addr, len);
xdrs->x_private += len;
return TRUE;
}
/*
* Not sure what this one does. But it clearly doesn't modify the contents
* of xdrs. **FIXME** does this not assume u_int == u_long?
*/
static u_int
xdrmem_getpos (const XDR *xdrs)
{
return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
}
/*
* xdrs modified
*/
static bool_t
xdrmem_setpos (XDR *xdrs, u_int pos)
{
caddr_t newaddr = xdrs->x_base + pos;
caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
size_t handy = lastaddr - newaddr;
if (newaddr > lastaddr
|| newaddr < xdrs->x_base
|| handy != (u_int) handy)
return FALSE;
xdrs->x_private = newaddr;
xdrs->x_handy = (u_int) handy;
return TRUE;
}
/*
* xdrs modified
*/
static int32_t *
xdrmem_inline (XDR *xdrs, u_int len)
{
int32_t *buf = 0;
if (xdrs->x_handy >= len)
{
xdrs->x_handy -= len;
buf = (int32_t *) xdrs->x_private;
xdrs->x_private += len;
}
return buf;
}
/*
* Gets the next word from the memory referenced by xdrs and places it
* in the int pointed to by ip. It then increments the private word to
* point at the next element. Neither object pointed to is const
*/
static bool_t
xdrmem_getint32 (XDR *xdrs, int32_t *ip)
{
if (xdrs->x_handy < 4)
return FALSE;
xdrs->x_handy -= 4;
*ip = ntohl ((*((int32_t *) (xdrs->x_private))));
xdrs->x_private += 4;
return TRUE;
}
/*
* Puts the long pointed to by lp in the memory referenced by xdrs. It
* then increments the private word to point at the next element. The
* long pointed at is const
*/
static bool_t
xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
{
if (xdrs->x_handy < 4)
return FALSE;
xdrs->x_handy -= 4;
*(int32_t *) xdrs->x_private = htonl (*ip);
xdrs->x_private += 4;
return TRUE;
}
|