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