1 /* $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 mycroft Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials
17 * provided with the distribution.
18 * * Neither the name of the "Oracle America, Inc." nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *sccsid2 = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
38 static char *sccsid = "@(#)xdr_stdio.c 2.1 88/07/29 4.0 RPCSRC";
39 #endif
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: stable/12/lib/libc/xdr/xdr_stdio.c 326025 2017-11-20 19:49:47Z pfg $");
42
43 /*
44 * xdr_stdio.c, XDR implementation on standard i/o file.
45 *
46 * This set of routines implements a XDR on a stdio stream.
47 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
48 * from the stream.
49 */
50
51 #include "namespace.h"
52 #include <stdio.h>
53
54 #include <arpa/inet.h>
55 #include <rpc/types.h>
56 #include <rpc/xdr.h>
57 #include "un-namespace.h"
58
59 static void xdrstdio_destroy(XDR *);
60 static bool_t xdrstdio_getlong(XDR *, long *);
61 static bool_t xdrstdio_putlong(XDR *, const long *);
62 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
63 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
64 static u_int xdrstdio_getpos(XDR *);
65 static bool_t xdrstdio_setpos(XDR *, u_int);
66 static int32_t *xdrstdio_inline(XDR *, u_int);
67
68 /*
69 * Ops vector for stdio type XDR
70 */
71 static const struct xdr_ops xdrstdio_ops = {
72 xdrstdio_getlong, /* deseraialize a long int */
73 xdrstdio_putlong, /* seraialize a long int */
74 xdrstdio_getbytes, /* deserialize counted bytes */
75 xdrstdio_putbytes, /* serialize counted bytes */
76 xdrstdio_getpos, /* get offset in the stream */
77 xdrstdio_setpos, /* set offset in the stream */
78 xdrstdio_inline, /* prime stream for inline macros */
79 xdrstdio_destroy /* destroy stream */
80 };
81
82 /*
83 * Initialize a stdio xdr stream.
84 * Sets the xdr stream handle xdrs for use on the stream file.
85 * Operation flag is set to op.
86 */
87 void
xdrstdio_create(XDR * xdrs,FILE * file,enum xdr_op op)88 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
89 {
90
91 xdrs->x_op = op;
92 xdrs->x_ops = &xdrstdio_ops;
93 xdrs->x_private = file;
94 xdrs->x_handy = 0;
95 xdrs->x_base = 0;
96 }
97
98 /*
99 * Destroy a stdio xdr stream.
100 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
101 */
102 static void
xdrstdio_destroy(XDR * xdrs)103 xdrstdio_destroy(XDR *xdrs)
104 {
105 (void)fflush((FILE *)xdrs->x_private);
106 /* XXX: should we close the file ?? */
107 }
108
109 static bool_t
xdrstdio_getlong(XDR * xdrs,long * lp)110 xdrstdio_getlong(XDR *xdrs, long *lp)
111 {
112 u_int32_t temp;
113
114 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
115 return (FALSE);
116 *lp = (long)ntohl(temp);
117 return (TRUE);
118 }
119
120 static bool_t
xdrstdio_putlong(XDR * xdrs,const long * lp)121 xdrstdio_putlong(XDR *xdrs, const long *lp)
122 {
123 int32_t mycopy = htonl((u_int32_t)*lp);
124
125 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
126 return (FALSE);
127 return (TRUE);
128 }
129
130 static bool_t
xdrstdio_getbytes(XDR * xdrs,char * addr,u_int len)131 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
132 {
133
134 if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
135 return (FALSE);
136 return (TRUE);
137 }
138
139 static bool_t
xdrstdio_putbytes(XDR * xdrs,const char * addr,u_int len)140 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
141 {
142
143 if ((len != 0) && (fwrite(addr, (size_t)len, 1,
144 (FILE *)xdrs->x_private) != 1))
145 return (FALSE);
146 return (TRUE);
147 }
148
149 static u_int
xdrstdio_getpos(XDR * xdrs)150 xdrstdio_getpos(XDR *xdrs)
151 {
152
153 return ((u_int) ftell((FILE *)xdrs->x_private));
154 }
155
156 static bool_t
xdrstdio_setpos(XDR * xdrs,u_int pos)157 xdrstdio_setpos(XDR *xdrs, u_int pos)
158 {
159
160 return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
161 FALSE : TRUE);
162 }
163
164 /* ARGSUSED */
165 static int32_t *
xdrstdio_inline(XDR * xdrs,u_int len)166 xdrstdio_inline(XDR *xdrs, u_int len)
167 {
168
169 /*
170 * Must do some work to implement this: must insure
171 * enough data in the underlying stdio buffer,
172 * that the buffer is aligned so that we can indirect through a
173 * long *, and stuff this pointer in xdrs->x_buf. Doing
174 * a fread or fwrite to a scratch buffer would defeat
175 * most of the gains to be had here and require storage
176 * management on this buffer, so we don't do this.
177 */
178 return (NULL);
179 }
180