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
50static bool_t xdrstdio_getlong (XDR *, long *);
51static bool_t xdrstdio_putlong (XDR *, const long *);
52static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
53static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
54static u_int xdrstdio_getpos (const XDR *);
55static bool_t xdrstdio_setpos (XDR *, u_int);
56static int32_t *xdrstdio_inline (XDR *, u_int);
57static void xdrstdio_destroy (XDR *);
58static bool_t xdrstdio_getint32 (XDR *, int32_t *);
59static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
60
61/*
62 * Ops vector for stdio type XDR
63 */
64static 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 */
83void
84xdrstdio_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 */
99static void
100xdrstdio_destroy (XDR *xdrs)
101{
102 (void) fflush ((FILE *) xdrs->x_private);
103 /* xx should we close the file ?? */
104};
105
106static bool_t
107xdrstdio_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
117static bool_t
118xdrstdio_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
127static bool_t
128xdrstdio_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
136static bool_t
137xdrstdio_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
145static u_int
146xdrstdio_getpos (const XDR *xdrs)
147{
148 return (u_int) ftell ((FILE *) xdrs->x_private);
149}
150
151static bool_t
152xdrstdio_setpos (XDR *xdrs, u_int pos)
153{
154 return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
155}
156
157static int32_t *
158xdrstdio_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
172static bool_t
173xdrstdio_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
183static bool_t
184xdrstdio_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
194libc_hidden_def (xdrstdio_create)
195#else
196libc_hidden_nolink_sunrpc (xdrstdio_create, GLIBC_2_0)
197#endif
198