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cb636bb2 | 1 | /* |
a7ab6ec8 UD |
2 | * xdr_mem.c, XDR implementation using memory buffers. |
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. | |
28f540f4 RM |
32 | * |
33 | * If you have some data to be interpreted as external data representation | |
34 | * or to be converted to external data representation in a memory buffer, | |
35 | * then this is the package for you. | |
28f540f4 RM |
36 | */ |
37 | ||
e7fd8a39 | 38 | #include <string.h> |
fd4c894c | 39 | #include <limits.h> |
e7fd8a39 | 40 | #include <rpc/rpc.h> |
82f43dd2 | 41 | #include <shlib-compat.h> |
e7fd8a39 UD |
42 | |
43 | static bool_t xdrmem_getlong (XDR *, long *); | |
1f205a47 | 44 | static bool_t xdrmem_putlong (XDR *, const long *); |
e7fd8a39 | 45 | static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int); |
bfbc5754 | 46 | static bool_t xdrmem_putbytes (XDR *, const char *, u_int); |
1f205a47 | 47 | static u_int xdrmem_getpos (const XDR *); |
e7fd8a39 | 48 | static bool_t xdrmem_setpos (XDR *, u_int); |
55187f62 | 49 | static int32_t *xdrmem_inline (XDR *, u_int); |
92f1da4d | 50 | static void xdrmem_destroy (XDR *); |
7d1de115 UD |
51 | static bool_t xdrmem_getint32 (XDR *, int32_t *); |
52 | static bool_t xdrmem_putint32 (XDR *, const int32_t *); | |
e7fd8a39 UD |
53 | |
54 | static const struct xdr_ops xdrmem_ops = | |
55 | { | |
56 | xdrmem_getlong, | |
57 | xdrmem_putlong, | |
58 | xdrmem_getbytes, | |
59 | xdrmem_putbytes, | |
60 | xdrmem_getpos, | |
61 | xdrmem_setpos, | |
62 | xdrmem_inline, | |
7d1de115 UD |
63 | xdrmem_destroy, |
64 | xdrmem_getint32, | |
65 | xdrmem_putint32 | |
28f540f4 RM |
66 | }; |
67 | ||
68 | /* | |
69 | * The procedure xdrmem_create initializes a stream descriptor for a | |
e7fd8a39 | 70 | * memory buffer. |
28f540f4 RM |
71 | */ |
72 | void | |
f8afba91 | 73 | xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op) |
28f540f4 | 74 | { |
e7fd8a39 | 75 | xdrs->x_op = op; |
737547be UD |
76 | /* We have to add the const since the `struct xdr_ops' in `struct XDR' |
77 | is not `const'. */ | |
78 | xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops; | |
e7fd8a39 UD |
79 | xdrs->x_private = xdrs->x_base = addr; |
80 | xdrs->x_handy = size; | |
28f540f4 | 81 | } |
7b57bfe5 UD |
82 | #ifdef EXPORT_RPC_SYMBOLS |
83 | libc_hidden_def (xdrmem_create) | |
84 | #else | |
021db4be | 85 | libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0) |
7b57bfe5 | 86 | #endif |
28f540f4 | 87 | |
1f205a47 UD |
88 | /* |
89 | * Nothing needs to be done for the memory case. The argument is clearly | |
90 | * const. | |
91 | */ | |
92 | ||
28f540f4 | 93 | static void |
92f1da4d | 94 | xdrmem_destroy (XDR *xdrs) |
28f540f4 RM |
95 | { |
96 | } | |
97 | ||
1f205a47 UD |
98 | /* |
99 | * Gets the next word from the memory referenced by xdrs and places it | |
100 | * in the long pointed to by lp. It then increments the private word to | |
101 | * point at the next element. Neither object pointed to is const | |
102 | */ | |
28f540f4 | 103 | static bool_t |
f8afba91 | 104 | xdrmem_getlong (XDR *xdrs, long *lp) |
28f540f4 | 105 | { |
fd4c894c | 106 | if (xdrs->x_handy < 4) |
e7fd8a39 | 107 | return FALSE; |
fd4c894c | 108 | xdrs->x_handy -= 4; |
e7fd8a39 UD |
109 | *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private)))); |
110 | xdrs->x_private += 4; | |
111 | return TRUE; | |
28f540f4 RM |
112 | } |
113 | ||
1f205a47 UD |
114 | /* |
115 | * Puts the long pointed to by lp in the memory referenced by xdrs. It | |
116 | * then increments the private word to point at the next element. The | |
117 | * long pointed at is const | |
118 | */ | |
28f540f4 | 119 | static bool_t |
f8afba91 | 120 | xdrmem_putlong (XDR *xdrs, const long *lp) |
28f540f4 | 121 | { |
fd4c894c | 122 | if (xdrs->x_handy < 4) |
e7fd8a39 | 123 | return FALSE; |
fd4c894c | 124 | xdrs->x_handy -= 4; |
e7fd8a39 UD |
125 | *(int32_t *) xdrs->x_private = htonl (*lp); |
126 | xdrs->x_private += 4; | |
127 | return TRUE; | |
28f540f4 RM |
128 | } |
129 | ||
1f205a47 UD |
130 | /* |
131 | * Gets an unaligned number of bytes from the xdrs structure and writes them | |
132 | * to the address passed in addr. Be very careful when calling this routine | |
133 | * as it could leave the xdrs pointing to an unaligned structure which is not | |
134 | * a good idea. None of the things pointed to are const. | |
135 | */ | |
28f540f4 | 136 | static bool_t |
f8afba91 | 137 | xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len) |
28f540f4 | 138 | { |
fd4c894c | 139 | if (xdrs->x_handy < len) |
e7fd8a39 | 140 | return FALSE; |
fd4c894c | 141 | xdrs->x_handy -= len; |
9af652f6 | 142 | memcpy (addr, xdrs->x_private, len); |
e7fd8a39 UD |
143 | xdrs->x_private += len; |
144 | return TRUE; | |
28f540f4 RM |
145 | } |
146 | ||
1f205a47 UD |
147 | /* |
148 | * The complementary function to the above. The same warnings apply about | |
149 | * unaligned data. The source address is const. | |
150 | */ | |
28f540f4 | 151 | static bool_t |
f8afba91 | 152 | xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len) |
28f540f4 | 153 | { |
fd4c894c | 154 | if (xdrs->x_handy < len) |
e7fd8a39 | 155 | return FALSE; |
fd4c894c | 156 | xdrs->x_handy -= len; |
9af652f6 | 157 | memcpy (xdrs->x_private, addr, len); |
e7fd8a39 UD |
158 | xdrs->x_private += len; |
159 | return TRUE; | |
28f540f4 RM |
160 | } |
161 | ||
1f205a47 UD |
162 | /* |
163 | * Not sure what this one does. But it clearly doesn't modify the contents | |
164 | * of xdrs. **FIXME** does this not assume u_int == u_long? | |
165 | */ | |
28f540f4 | 166 | static u_int |
f8afba91 | 167 | xdrmem_getpos (const XDR *xdrs) |
28f540f4 | 168 | { |
e7fd8a39 | 169 | return (u_long) xdrs->x_private - (u_long) xdrs->x_base; |
28f540f4 RM |
170 | } |
171 | ||
1f205a47 UD |
172 | /* |
173 | * xdrs modified | |
174 | */ | |
28f540f4 | 175 | static bool_t |
9d46370c | 176 | xdrmem_setpos (XDR *xdrs, u_int pos) |
28f540f4 | 177 | { |
e7fd8a39 UD |
178 | caddr_t newaddr = xdrs->x_base + pos; |
179 | caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; | |
609cf614 | 180 | size_t handy = lastaddr - newaddr; |
e7fd8a39 | 181 | |
609cf614 UD |
182 | if (newaddr > lastaddr |
183 | || newaddr < xdrs->x_base | |
184 | || handy != (u_int) handy) | |
e7fd8a39 | 185 | return FALSE; |
609cf614 | 186 | |
e7fd8a39 | 187 | xdrs->x_private = newaddr; |
609cf614 | 188 | xdrs->x_handy = (u_int) handy; |
e7fd8a39 | 189 | return TRUE; |
28f540f4 RM |
190 | } |
191 | ||
1f205a47 UD |
192 | /* |
193 | * xdrs modified | |
194 | */ | |
f8afba91 | 195 | static int32_t * |
55187f62 | 196 | xdrmem_inline (XDR *xdrs, u_int len) |
28f540f4 | 197 | { |
f8afba91 | 198 | int32_t *buf = 0; |
e7fd8a39 | 199 | |
55187f62 | 200 | if (xdrs->x_handy >= len) |
e7fd8a39 UD |
201 | { |
202 | xdrs->x_handy -= len; | |
f8afba91 | 203 | buf = (int32_t *) xdrs->x_private; |
e7fd8a39 UD |
204 | xdrs->x_private += len; |
205 | } | |
206 | return buf; | |
28f540f4 | 207 | } |
7d1de115 UD |
208 | |
209 | /* | |
210 | * Gets the next word from the memory referenced by xdrs and places it | |
211 | * in the int pointed to by ip. It then increments the private word to | |
212 | * point at the next element. Neither object pointed to is const | |
213 | */ | |
214 | static bool_t | |
215 | xdrmem_getint32 (XDR *xdrs, int32_t *ip) | |
216 | { | |
fd4c894c | 217 | if (xdrs->x_handy < 4) |
7d1de115 | 218 | return FALSE; |
fd4c894c | 219 | xdrs->x_handy -= 4; |
7d1de115 UD |
220 | *ip = ntohl ((*((int32_t *) (xdrs->x_private)))); |
221 | xdrs->x_private += 4; | |
222 | return TRUE; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Puts the long pointed to by lp in the memory referenced by xdrs. It | |
227 | * then increments the private word to point at the next element. The | |
228 | * long pointed at is const | |
229 | */ | |
230 | static bool_t | |
231 | xdrmem_putint32 (XDR *xdrs, const int32_t *ip) | |
232 | { | |
fd4c894c | 233 | if (xdrs->x_handy < 4) |
7d1de115 | 234 | return FALSE; |
fd4c894c | 235 | xdrs->x_handy -= 4; |
7d1de115 UD |
236 | *(int32_t *) xdrs->x_private = htonl (*ip); |
237 | xdrs->x_private += 4; | |
238 | return TRUE; | |
239 | } |