1/*
2 * xdr.h, External Data Representation Serialization Routines.
3 *
4 * Copyright (c) 2010, 2012, 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
34#ifndef _RPC_XDR_H
35#define _RPC_XDR_H 1
36
37#include <features.h>
38#include <sys/types.h>
39#include <rpc/types.h>
40
41/* We need FILE. */
42#include <stdio.h>
43
44__BEGIN_DECLS
45
46/*
47 * XDR provides a conventional way for converting between C data
48 * types and an external bit-string representation. Library supplied
49 * routines provide for the conversion on built-in C data types. These
50 * routines and utility routines defined here are used to help implement
51 * a type encode/decode routine for each user-defined type.
52 *
53 * Each data type provides a single procedure which takes two arguments:
54 *
55 * bool_t
56 * xdrproc(xdrs, argresp)
57 * XDR *xdrs;
58 * <type> *argresp;
59 *
60 * xdrs is an instance of a XDR handle, to which or from which the data
61 * type is to be converted. argresp is a pointer to the structure to be
62 * converted. The XDR handle contains an operation field which indicates
63 * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
64 *
65 * XDR_DECODE may allocate space if the pointer argresp is null. This
66 * data can be freed with the XDR_FREE operation.
67 *
68 * We write only one procedure per data type to make it easy
69 * to keep the encode and decode procedures for a data type consistent.
70 * In many cases the same code performs all operations on a user defined type,
71 * because all the hard work is done in the component type routines.
72 * decode as a series of calls on the nested data types.
73 */
74
75/*
76 * Xdr operations. XDR_ENCODE causes the type to be encoded into the
77 * stream. XDR_DECODE causes the type to be extracted from the stream.
78 * XDR_FREE can be used to release the space allocated by an XDR_DECODE
79 * request.
80 */
81enum xdr_op {
82 XDR_ENCODE = 0,
83 XDR_DECODE = 1,
84 XDR_FREE = 2
85};
86
87/*
88 * This is the number of bytes per unit of external data.
89 */
90#define BYTES_PER_XDR_UNIT (4)
91/*
92 * This only works if the above is a power of 2. But it's defined to be
93 * 4 by the appropriate RFCs. So it will work. And it's normally quicker
94 * than the old routine.
95 */
96#if 1
97#define RNDUP(x) (((x) + BYTES_PER_XDR_UNIT - 1) & ~(BYTES_PER_XDR_UNIT - 1))
98#else /* this is the old routine */
99#define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
100 * BYTES_PER_XDR_UNIT)
101#endif
102
103/*
104 * The XDR handle.
105 * Contains operation which is being applied to the stream,
106 * an operations vector for the particular implementation (e.g. see xdr_mem.c),
107 * and two private fields for the use of the particular implementation.
108 */
109typedef struct XDR XDR;
110struct XDR
111 {
112 enum xdr_op x_op; /* operation; fast additional param */
113 struct xdr_ops
114 {
115 bool_t (*x_getlong) (XDR *__xdrs, long *__lp);
116 /* get a long from underlying stream */
117 bool_t (*x_putlong) (XDR *__xdrs, const long *__lp);
118 /* put a long to " */
119 bool_t (*x_getbytes) (XDR *__xdrs, caddr_t __addr, u_int __len);
120 /* get some bytes from " */
121 bool_t (*x_putbytes) (XDR *__xdrs, const char *__addr, u_int __len);
122 /* put some bytes to " */
123 u_int (*x_getpostn) (const XDR *__xdrs);
124 /* returns bytes off from beginning */
125 bool_t (*x_setpostn) (XDR *__xdrs, u_int __pos);
126 /* lets you reposition the stream */
127 int32_t *(*x_inline) (XDR *__xdrs, u_int __len);
128 /* buf quick ptr to buffered data */
129 void (*x_destroy) (XDR *__xdrs);
130 /* free privates of this xdr_stream */
131 bool_t (*x_getint32) (XDR *__xdrs, int32_t *__ip);
132 /* get a int from underlying stream */
133 bool_t (*x_putint32) (XDR *__xdrs, const int32_t *__ip);
134 /* put a int to " */
135 }
136 *x_ops;
137 caddr_t x_public; /* users' data */
138 caddr_t x_private; /* pointer to private data */
139 caddr_t x_base; /* private used for position info */
140 u_int x_handy; /* extra private word */
141 };
142
143/*
144 * A xdrproc_t exists for each data type which is to be encoded or decoded.
145 *
146 * The second argument to the xdrproc_t is a pointer to an opaque pointer.
147 * The opaque pointer generally points to a structure of the data type
148 * to be decoded. If this pointer is 0, then the type routines should
149 * allocate dynamic storage of the appropriate size and return it.
150 * bool_t (*xdrproc_t)(XDR *, caddr_t *);
151 */
152typedef bool_t (*xdrproc_t) (XDR *, void *,...);
153
154
155/*
156 * Operations defined on a XDR handle
157 *
158 * XDR *xdrs;
159 * int32_t *int32p;
160 * long *longp;
161 * caddr_t addr;
162 * u_int len;
163 * u_int pos;
164 */
165#define XDR_GETINT32(xdrs, int32p) \
166 (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
167#define xdr_getint32(xdrs, int32p) \
168 (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
169
170#define XDR_PUTINT32(xdrs, int32p) \
171 (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
172#define xdr_putint32(xdrs, int32p) \
173 (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
174
175#define XDR_GETLONG(xdrs, longp) \
176 (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
177#define xdr_getlong(xdrs, longp) \
178 (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
179
180#define XDR_PUTLONG(xdrs, longp) \
181 (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
182#define xdr_putlong(xdrs, longp) \
183 (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
184
185#define XDR_GETBYTES(xdrs, addr, len) \
186 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
187#define xdr_getbytes(xdrs, addr, len) \
188 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
189
190#define XDR_PUTBYTES(xdrs, addr, len) \
191 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
192#define xdr_putbytes(xdrs, addr, len) \
193 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
194
195#define XDR_GETPOS(xdrs) \
196 (*(xdrs)->x_ops->x_getpostn)(xdrs)
197#define xdr_getpos(xdrs) \
198 (*(xdrs)->x_ops->x_getpostn)(xdrs)
199
200#define XDR_SETPOS(xdrs, pos) \
201 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
202#define xdr_setpos(xdrs, pos) \
203 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
204
205#define XDR_INLINE(xdrs, len) \
206 (*(xdrs)->x_ops->x_inline)(xdrs, len)
207#define xdr_inline(xdrs, len) \
208 (*(xdrs)->x_ops->x_inline)(xdrs, len)
209
210#define XDR_DESTROY(xdrs) \
211 do { \
212 if ((xdrs)->x_ops->x_destroy) \
213 (*(xdrs)->x_ops->x_destroy)(xdrs); \
214 } while (0)
215#define xdr_destroy(xdrs) \
216 do { \
217 if ((xdrs)->x_ops->x_destroy) \
218 (*(xdrs)->x_ops->x_destroy)(xdrs); \
219 } while (0)
220
221/*
222 * Support struct for discriminated unions.
223 * You create an array of xdrdiscrim structures, terminated with
224 * an entry with a null procedure pointer. The xdr_union routine gets
225 * the discriminant value and then searches the array of structures
226 * for a matching value. If a match is found the associated xdr routine
227 * is called to handle that part of the union. If there is
228 * no match, then a default routine may be called.
229 * If there is no match and no default routine it is an error.
230 */
231#define NULL_xdrproc_t ((xdrproc_t)0)
232struct xdr_discrim
233{
234 int value;
235 xdrproc_t proc;
236};
237
238/*
239 * Inline routines for fast encode/decode of primitive data types.
240 * Caveat emptor: these use single memory cycles to get the
241 * data from the underlying buffer, and will fail to operate
242 * properly if the data is not aligned. The standard way to use these
243 * is to say:
244 * if ((buf = XDR_INLINE(xdrs, count)) == NULL)
245 * return (FALSE);
246 * <<< macro calls >>>
247 * where ``count'' is the number of bytes of data occupied
248 * by the primitive data types.
249 *
250 * N.B. and frozen for all time: each data type here uses 4 bytes
251 * of external representation.
252 */
253
254#define IXDR_GET_INT32(buf) ((int32_t)ntohl((uint32_t)*(buf)++))
255#define IXDR_PUT_INT32(buf, v) (*(buf)++ = (int32_t)htonl((uint32_t)(v)))
256#define IXDR_GET_U_INT32(buf) ((uint32_t)IXDR_GET_INT32(buf))
257#define IXDR_PUT_U_INT32(buf, v) IXDR_PUT_INT32(buf, (int32_t)(v))
258
259/* WARNING: The IXDR_*_LONG defines are removed by Sun for new platforms
260 * and shouldn't be used any longer. Code which use this defines or longs
261 * in the RPC code will not work on 64bit Solaris platforms !
262 */
263#define IXDR_GET_LONG(buf) ((long)IXDR_GET_U_INT32(buf))
264#define IXDR_PUT_LONG(buf, v) ((long)IXDR_PUT_INT32(buf, (long)(v)))
265#define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
266#define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG(buf, (long)(v))
267
268
269#define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
270#define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
271#define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
272#define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
273
274#define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG(buf, (long)(v))
275#define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG(buf, (long)(v))
276#define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
277#define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
278
279/*
280 * These are the "generic" xdr routines.
281 * None of these can have const applied because it's not possible to
282 * know whether the call is a read or a write to the passed parameter
283 * also, the XDR structure is always updated by some of these calls.
284 */
285extern bool_t xdr_void (void) __THROW;
286extern bool_t xdr_short (XDR *__xdrs, short *__sp) __THROW;
287extern bool_t xdr_u_short (XDR *__xdrs, u_short *__usp) __THROW;
288extern bool_t xdr_int (XDR *__xdrs, int *__ip) __THROW;
289extern bool_t xdr_u_int (XDR *__xdrs, u_int *__up) __THROW;
290extern bool_t xdr_long (XDR *__xdrs, long *__lp) __THROW;
291extern bool_t xdr_u_long (XDR *__xdrs, u_long *__ulp) __THROW;
292extern bool_t xdr_hyper (XDR *__xdrs, quad_t *__llp) __THROW;
293extern bool_t xdr_u_hyper (XDR *__xdrs, u_quad_t *__ullp) __THROW;
294extern bool_t xdr_longlong_t (XDR *__xdrs, quad_t *__llp) __THROW;
295extern bool_t xdr_u_longlong_t (XDR *__xdrs, u_quad_t *__ullp) __THROW;
296extern bool_t xdr_int8_t (XDR *__xdrs, int8_t *__ip) __THROW;
297extern bool_t xdr_uint8_t (XDR *__xdrs, uint8_t *__up) __THROW;
298extern bool_t xdr_int16_t (XDR *__xdrs, int16_t *__ip) __THROW;
299extern bool_t xdr_uint16_t (XDR *__xdrs, uint16_t *__up) __THROW;
300extern bool_t xdr_int32_t (XDR *__xdrs, int32_t *__ip) __THROW;
301extern bool_t xdr_uint32_t (XDR *__xdrs, uint32_t *__up) __THROW;
302extern bool_t xdr_int64_t (XDR *__xdrs, int64_t *__ip) __THROW;
303extern bool_t xdr_uint64_t (XDR *__xdrs, uint64_t *__up) __THROW;
304extern bool_t xdr_quad_t (XDR *__xdrs, quad_t *__ip) __THROW;
305extern bool_t xdr_u_quad_t (XDR *__xdrs, u_quad_t *__up) __THROW;
306extern bool_t xdr_bool (XDR *__xdrs, bool_t *__bp) __THROW;
307extern bool_t xdr_enum (XDR *__xdrs, enum_t *__ep) __THROW;
308extern bool_t xdr_array (XDR * _xdrs, caddr_t *__addrp, u_int *__sizep,
309 u_int __maxsize, u_int __elsize, xdrproc_t __elproc)
310 __THROW;
311extern bool_t xdr_bytes (XDR *__xdrs, char **__cpp, u_int *__sizep,
312 u_int __maxsize) __THROW;
313extern bool_t xdr_opaque (XDR *__xdrs, caddr_t __cp, u_int __cnt) __THROW;
314extern bool_t xdr_string (XDR *__xdrs, char **__cpp, u_int __maxsize) __THROW;
315extern bool_t xdr_union (XDR *__xdrs, enum_t *__dscmp, char *__unp,
316 const struct xdr_discrim *__choices,
317 xdrproc_t __dfault) __THROW;
318extern bool_t xdr_char (XDR *__xdrs, char *__cp) __THROW;
319extern bool_t xdr_u_char (XDR *__xdrs, u_char *__cp) __THROW;
320extern bool_t xdr_vector (XDR *__xdrs, char *__basep, u_int __nelem,
321 u_int __elemsize, xdrproc_t __xdr_elem) __THROW;
322extern bool_t xdr_float (XDR *__xdrs, float *__fp) __THROW;
323extern bool_t xdr_double (XDR *__xdrs, double *__dp) __THROW;
324extern bool_t xdr_reference (XDR *__xdrs, caddr_t *__xpp, u_int __size,
325 xdrproc_t __proc) __THROW;
326extern bool_t xdr_pointer (XDR *__xdrs, char **__objpp,
327 u_int __obj_size, xdrproc_t __xdr_obj) __THROW;
328extern bool_t xdr_wrapstring (XDR *__xdrs, char **__cpp) __THROW;
329extern u_long xdr_sizeof (xdrproc_t, void *) __THROW;
330
331/*
332 * Common opaque bytes objects used by many rpc protocols;
333 * declared here due to commonality.
334 */
335#define MAX_NETOBJ_SZ 1024
336struct netobj
337{
338 u_int n_len;
339 char *n_bytes;
340};
341typedef struct netobj netobj;
342extern bool_t xdr_netobj (XDR *__xdrs, struct netobj *__np) __THROW;
343
344/*
345 * These are the public routines for the various implementations of
346 * xdr streams.
347 */
348
349/* XDR using memory buffers */
350extern void xdrmem_create (XDR *__xdrs, const caddr_t __addr,
351 u_int __size, enum xdr_op __xop) __THROW;
352
353/* XDR using stdio library */
354extern void xdrstdio_create (XDR *__xdrs, FILE *__file, enum xdr_op __xop)
355 __THROW;
356
357/* XDR pseudo records for tcp */
358extern void xdrrec_create (XDR *__xdrs, u_int __sendsize,
359 u_int __recvsize, caddr_t __tcp_handle,
360 int (*__readit) (char *, char *, int),
361 int (*__writeit) (char *, char *, int)) __THROW;
362
363/* make end of xdr record */
364extern bool_t xdrrec_endofrecord (XDR *__xdrs, bool_t __sendnow) __THROW;
365
366/* move to beginning of next record */
367extern bool_t xdrrec_skiprecord (XDR *__xdrs) __THROW;
368
369/* true if no more input */
370extern bool_t xdrrec_eof (XDR *__xdrs) __THROW;
371
372/* free memory buffers for xdr */
373extern void xdr_free (xdrproc_t __proc, char *__objp) __THROW;
374
375__END_DECLS
376
377#endif /* rpc/xdr.h */
378

source code of include/rpc/xdr.h