1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29 /*
30 * Portions of this source code were derived from Berkeley
31 * 4.3 BSD under license from the Regents of the University of
32 * California.
33 */
34
35 #pragma ident "%Z%%M% %I% %E% SMI"
36
37 /*
38 * xdr_stdio.c, XDR implementation on standard i/o file.
39 *
40 * This set of routines implements a XDR on a stdio stream.
41 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
42 * from the stream.
43 */
44
45 #include "mt.h"
46 #include "rpc_mt.h"
47 #include <rpc/types.h>
48 #include <stdio.h>
49 #include <rpc/xdr.h>
50 #include <sys/types.h>
51 #include <inttypes.h>
52
53 static struct xdr_ops *xdrstdio_ops(void);
54
55 /*
56 * Initialize a stdio xdr stream.
57 * Sets the xdr stream handle xdrs for use on the stream file.
58 * Operation flag is set to op.
59 */
60 void
xdrstdio_create(XDR * xdrs,FILE * file,const enum xdr_op op)61 xdrstdio_create(XDR *xdrs, FILE *file, const enum xdr_op op)
62 {
63 xdrs->x_op = op;
64 xdrs->x_ops = xdrstdio_ops();
65 xdrs->x_private = (caddr_t)file;
66 xdrs->x_handy = 0;
67 xdrs->x_base = 0;
68 }
69
70 /*
71 * Destroy a stdio xdr stream.
72 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
73 */
74 static void
xdrstdio_destroy(XDR * xdrs)75 xdrstdio_destroy(XDR *xdrs)
76 {
77 /* LINTED pointer cast */
78 (void) fflush((FILE *)xdrs->x_private);
79 /* xx should we close the file ?? */
80 }
81
82
83 static bool_t
xdrstdio_getint32(XDR * xdrs,int32_t * lp)84 xdrstdio_getint32(XDR *xdrs, int32_t *lp)
85 {
86 if (fread((caddr_t)lp, sizeof (int32_t), 1,
87 /* LINTED pointer cast */
88 (FILE *)xdrs->x_private) != 1)
89 return (FALSE);
90 *lp = ntohl(*lp);
91 return (TRUE);
92 }
93
94 static bool_t
xdrstdio_putint32(XDR * xdrs,int32_t * lp)95 xdrstdio_putint32(XDR *xdrs, int32_t *lp)
96 {
97
98 int32_t mycopy = htonl(*lp);
99 lp = &mycopy;
100
101 if (fwrite((caddr_t)lp, sizeof (int32_t), 1,
102 /* LINTED pointer cast */
103 (FILE *)xdrs->x_private) != 1)
104 return (FALSE);
105 return (TRUE);
106 }
107
108 static bool_t
xdrstdio_getlong(XDR * xdrs,long * lp)109 xdrstdio_getlong(XDR *xdrs, long *lp)
110 {
111 int32_t i;
112
113 if (!xdrstdio_getint32(xdrs, &i))
114 return (FALSE);
115 *lp = (long)i;
116 return (TRUE);
117 }
118
119 static bool_t
xdrstdio_putlong(XDR * xdrs,long * lp)120 xdrstdio_putlong(XDR *xdrs, long *lp)
121 {
122 int32_t i;
123
124 #if defined(_LP64)
125 if ((*lp > INT32_MAX) || (*lp < INT32_MIN))
126 return (FALSE);
127 #endif
128 i = (int32_t)*lp;
129
130 return (xdrstdio_putint32(xdrs, &i));
131 }
132
133 static bool_t
xdrstdio_getbytes(XDR * xdrs,caddr_t addr,int len)134 xdrstdio_getbytes(XDR *xdrs, caddr_t addr, int len)
135 {
136 if ((len != 0) &&
137 /* LINTED pointer cast */
138 (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
139 return (FALSE);
140 return (TRUE);
141 }
142
143 static bool_t
xdrstdio_putbytes(XDR * xdrs,caddr_t addr,int len)144 xdrstdio_putbytes(XDR *xdrs, caddr_t addr, int len)
145 {
146 if ((len != 0) &&
147 /* LINTED pointer cast */
148 (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
149 return (FALSE);
150 return (TRUE);
151 }
152
153 static uint_t
xdrstdio_getpos(XDR * xdrs)154 xdrstdio_getpos(XDR *xdrs)
155 {
156 /* LINTED pointer cast */
157 return ((uint_t)ftell((FILE *)xdrs->x_private));
158 }
159
160 static bool_t
xdrstdio_setpos(XDR * xdrs,uint_t pos)161 xdrstdio_setpos(XDR *xdrs, uint_t pos)
162 {
163 /* LINTED pointer cast */
164 return ((fseek((FILE *)xdrs->x_private,
165 (int)pos, 0) < 0) ? FALSE : TRUE);
166 }
167
168 /* ARGSUSED */
169 static rpc_inline_t *
xdrstdio_inline(XDR * xdrs,int len)170 xdrstdio_inline(XDR *xdrs, int len)
171 {
172 /*
173 * Must do some work to implement this: must insure
174 * enough data in the underlying stdio buffer,
175 * that the buffer is aligned so that we can indirect through a
176 * long *, and stuff this pointer in xdrs->x_buf. Doing
177 * a fread or fwrite to a scratch buffer would defeat
178 * most of the gains to be had here and require storage
179 * management on this buffer, so we don't do this.
180 */
181 return (NULL);
182 }
183
184 /* ARGSUSED */
185 static bool_t
xdrstdio_control(XDR * xdrs,int request,void * info)186 xdrstdio_control(XDR *xdrs, int request, void *info)
187 {
188 return (FALSE);
189 }
190
191 static struct xdr_ops *
xdrstdio_ops(void)192 xdrstdio_ops(void)
193 {
194 static struct xdr_ops ops;
195 extern mutex_t ops_lock;
196
197 /* VARIABLES PROTECTED BY ops_lock: ops */
198
199 (void) mutex_lock(&ops_lock);
200 if (ops.x_getlong == NULL) {
201 ops.x_getlong = xdrstdio_getlong;
202 ops.x_putlong = xdrstdio_putlong;
203 ops.x_getbytes = xdrstdio_getbytes;
204 ops.x_putbytes = xdrstdio_putbytes;
205 ops.x_getpostn = xdrstdio_getpos;
206 ops.x_setpostn = xdrstdio_setpos;
207 ops.x_inline = xdrstdio_inline;
208 ops.x_destroy = xdrstdio_destroy;
209 ops.x_control = xdrstdio_control;
210 #if defined(_LP64)
211 ops.x_getint32 = xdrstdio_getint32;
212 ops.x_putint32 = xdrstdio_putint32;
213 #endif
214 }
215 (void) mutex_unlock(&ops_lock);
216 return (&ops);
217 }
218