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 | #define fflush(s) _IO_fflush (s) |
44 | #define fread(p, m, n, s) _IO_fread (p, m, n, s) |
45 | #define ftell(s) _IO_ftell (s) |
46 | #define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s) |
47 | |
48 | static bool_t xdrstdio_getlong (XDR *, long *); |
49 | static bool_t xdrstdio_putlong (XDR *, const long *); |
50 | static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int); |
51 | static bool_t xdrstdio_putbytes (XDR *, const char *, u_int); |
52 | static u_int xdrstdio_getpos (const XDR *); |
53 | static bool_t xdrstdio_setpos (XDR *, u_int); |
54 | static int32_t *xdrstdio_inline (XDR *, u_int); |
55 | static void xdrstdio_destroy (XDR *); |
56 | static bool_t xdrstdio_getint32 (XDR *, int32_t *); |
57 | static bool_t xdrstdio_putint32 (XDR *, const int32_t *); |
58 | |
59 | /* |
60 | * Ops vector for stdio type XDR |
61 | */ |
62 | static const struct xdr_ops xdrstdio_ops = |
63 | { |
64 | xdrstdio_getlong, /* deserialize a long int */ |
65 | xdrstdio_putlong, /* serialize a long int */ |
66 | xdrstdio_getbytes, /* deserialize counted bytes */ |
67 | xdrstdio_putbytes, /* serialize counted bytes */ |
68 | xdrstdio_getpos, /* get offset in the stream */ |
69 | xdrstdio_setpos, /* set offset in the stream */ |
70 | xdrstdio_inline, /* prime stream for inline macros */ |
71 | xdrstdio_destroy, /* destroy stream */ |
72 | xdrstdio_getint32, /* deserialize a int */ |
73 | xdrstdio_putint32 /* serialize a int */ |
74 | }; |
75 | |
76 | /* |
77 | * Initialize a stdio xdr stream. |
78 | * Sets the xdr stream handle xdrs for use on the stream file. |
79 | * Operation flag is set to op. |
80 | */ |
81 | void |
82 | xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op) |
83 | { |
84 | xdrs->x_op = op; |
85 | /* We have to add the const since the `struct xdr_ops' in `struct XDR' |
86 | is not `const'. */ |
87 | xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops; |
88 | xdrs->x_private = (caddr_t) file; |
89 | xdrs->x_handy = 0; |
90 | xdrs->x_base = 0; |
91 | } |
92 | |
93 | /* |
94 | * Destroy a stdio xdr stream. |
95 | * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create. |
96 | */ |
97 | static void |
98 | xdrstdio_destroy (XDR *xdrs) |
99 | { |
100 | (void) fflush ((FILE *) xdrs->x_private); |
101 | /* xx should we close the file ?? */ |
102 | }; |
103 | |
104 | static bool_t |
105 | xdrstdio_getlong (XDR *xdrs, long *lp) |
106 | { |
107 | u_int32_t mycopy; |
108 | |
109 | if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1) |
110 | return FALSE; |
111 | *lp = (long) ntohl (mycopy); |
112 | return TRUE; |
113 | } |
114 | |
115 | static bool_t |
116 | xdrstdio_putlong (XDR *xdrs, const long *lp) |
117 | { |
118 | int32_t mycopy = htonl ((u_int32_t) *lp); |
119 | |
120 | if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1) |
121 | return FALSE; |
122 | return TRUE; |
123 | } |
124 | |
125 | static bool_t |
126 | xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len) |
127 | { |
128 | if ((len != 0) && (fread (addr, (int) len, 1, |
129 | (FILE *) xdrs->x_private) != 1)) |
130 | return FALSE; |
131 | return TRUE; |
132 | } |
133 | |
134 | static bool_t |
135 | xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len) |
136 | { |
137 | if ((len != 0) && (fwrite (addr, (int) len, 1, |
138 | (FILE *) xdrs->x_private) != 1)) |
139 | return FALSE; |
140 | return TRUE; |
141 | } |
142 | |
143 | static u_int |
144 | xdrstdio_getpos (const XDR *xdrs) |
145 | { |
146 | return (u_int) ftell ((FILE *) xdrs->x_private); |
147 | } |
148 | |
149 | static bool_t |
150 | xdrstdio_setpos (XDR *xdrs, u_int pos) |
151 | { |
152 | return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE; |
153 | } |
154 | |
155 | static int32_t * |
156 | xdrstdio_inline (XDR *xdrs, u_int len) |
157 | { |
158 | /* |
159 | * Must do some work to implement this: must insure |
160 | * enough data in the underlying stdio buffer, |
161 | * that the buffer is aligned so that we can indirect through a |
162 | * long *, and stuff this pointer in xdrs->x_buf. Doing |
163 | * a fread or fwrite to a scratch buffer would defeat |
164 | * most of the gains to be had here and require storage |
165 | * management on this buffer, so we don't do this. |
166 | */ |
167 | return NULL; |
168 | } |
169 | |
170 | static bool_t |
171 | xdrstdio_getint32 (XDR *xdrs, int32_t *ip) |
172 | { |
173 | int32_t mycopy; |
174 | |
175 | if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1) |
176 | return FALSE; |
177 | *ip = ntohl (mycopy); |
178 | return TRUE; |
179 | } |
180 | |
181 | static bool_t |
182 | xdrstdio_putint32 (XDR *xdrs, const int32_t *ip) |
183 | { |
184 | int32_t mycopy = htonl (*ip); |
185 | |
186 | ip = &mycopy; |
187 | if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1) |
188 | return FALSE; |
189 | return TRUE; |
190 | } |
191 | #ifdef EXPORT_RPC_SYMBOLS |
192 | libc_hidden_def (xdrstdio_create) |
193 | #else |
194 | libc_hidden_nolink_sunrpc (xdrstdio_create, GLIBC_2_0) |
195 | #endif |
196 | |