include/rpc/xdr.h

   1 /*      $NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2009, Sun Microsystems, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  * - Redistributions of source code must retain the above copyright notice,
  10  *   this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright notice,
  12  *   this list of conditions and the following disclaimer in the documentation
  13  *   and/or other materials provided with the distribution.
  14  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  15  *   contributors may be used to endorse or promote products derived
  16  *   from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  *      from: @(#)xdr.h 1.19 87/04/22 SMI
  31  *      from: @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC
  32  * $FreeBSD$
  33  */
  34
  35 /*
  36  * xdr.h, External Data Representation Serialization Routines.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  */
  40
  41 #ifndef _RPC_XDR_H
  42 #define _RPC_XDR_H
  43 #include <sys/cdefs.h>
  44
  45 /*
  46  * XDR provides a conventional way for converting between C data
  47  * types and an external bit-string representation.  Library supplied
  48  * routines provide for the conversion on built-in C data types.  These
  49  * routines and utility routines defined here are used to help implement
  50  * a type encode/decode routine for each user-defined type.
  51  *
  52  * Each data type provides a single procedure which takes two arguments:
  53  *
  54  *      bool_t
  55  *      xdrproc(xdrs, argresp)
  56  *              XDR *xdrs;
  57  *              <type> *argresp;
  58  *
  59  * xdrs is an instance of a XDR handle, to which or from which the data
  60  * type is to be converted.  argresp is a pointer to the structure to be
  61  * converted.  The XDR handle contains an operation field which indicates
  62  * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
  63  *
  64  * XDR_DECODE may allocate space if the pointer argresp is null.  This
  65  * data can be freed with the XDR_FREE operation.
  66  *
  67  * We write only one procedure per data type to make it easy
  68  * to keep the encode and decode procedures for a data type consistent.
  69  * In many cases the same code performs all operations on a user defined type,
  70  * because all the hard work is done in the component type routines.
  71  * decode as a series of calls on the nested data types.
  72  */
  73
  74 /*
  75  * Xdr operations.  XDR_ENCODE causes the type to be encoded into the
  76  * stream.  XDR_DECODE causes the type to be extracted from the stream.
  77  * XDR_FREE can be used to release the space allocated by an XDR_DECODE
  78  * request.
  79  */
  80 enum xdr_op {
  81         XDR_ENCODE=0,
  82         XDR_DECODE=1,
  83         XDR_FREE=2
  84 };
  85
  86 /*
  87  * This is the number of bytes per unit of external data.
  88  */
  89 #define BYTES_PER_XDR_UNIT      (4)
  90 #define RNDUP(x)  ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
  91                     * BYTES_PER_XDR_UNIT)
  92
  93 /*
  94  * The XDR handle.
  95  * Contains operation which is being applied to the stream,
  96  * an operations vector for the particular implementation (e.g. see xdr_mem.c),
  97  * and two private fields for the use of the particular implementation.
  98  */
  99 typedef struct XDR {
 100         enum xdr_op     x_op;           /* operation; fast additional param */
 101         const struct xdr_ops {
 102                 /* get a long from underlying stream */
 103                 bool_t  (*x_getlong)(struct XDR *, long *);
 104                 /* put a long to " */
 105                 bool_t  (*x_putlong)(struct XDR *, const long *);
 106                 /* get some bytes from " */
 107                 bool_t  (*x_getbytes)(struct XDR *, char *, u_int);
 108                 /* put some bytes to " */
 109                 bool_t  (*x_putbytes)(struct XDR *, const char *, u_int);
 110                 /* returns bytes off from beginning */
 111                 u_int   (*x_getpostn)(struct XDR *);
 112                 /* lets you reposition the stream */
 113                 bool_t  (*x_setpostn)(struct XDR *, u_int);
 114                 /* buf quick ptr to buffered data */
 115                 int32_t *(*x_inline)(struct XDR *, u_int);
 116                 /* free privates of this xdr_stream */
 117                 void    (*x_destroy)(struct XDR *);
 118                 bool_t  (*x_control)(struct XDR *, int, void *);
 119         } *x_ops;
 120         char *          x_public;       /* users' data */
 121         void *          x_private;      /* pointer to private data */
 122         char *          x_base;         /* private used for position info */
 123         u_int           x_handy;        /* extra private word */
 124 } XDR;
 125
 126 /*
 127  * A xdrproc_t exists for each data type which is to be encoded or decoded.
 128  *
 129  * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 130  * The opaque pointer generally points to a structure of the data type
 131  * to be decoded.  If this pointer is 0, then the type routines should
 132  * allocate dynamic storage of the appropriate size and return it.
 133  */
 134 #ifdef _KERNEL
 135 typedef bool_t (*xdrproc_t)(XDR *, void *, u_int);
 136 #else
 137 /*
 138  * XXX can't actually prototype it, because some take three args!!!
 139  */
 140 typedef bool_t (*xdrproc_t)(XDR *, ...);
 141 #endif
 142
 143 /*
 144  * Operations defined on a XDR handle
 145  *
 146  * XDR          *xdrs;
 147  * long         *longp;
 148  * char *        addr;
 149  * u_int         len;
 150  * u_int         pos;
 151  */
 152 #define XDR_GETLONG(xdrs, longp)                        \
 153         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 154 #define xdr_getlong(xdrs, longp)                        \
 155         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 156
 157 #define XDR_PUTLONG(xdrs, longp)                        \
 158         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 159 #define xdr_putlong(xdrs, longp)                        \
 160         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 161
 162 static __inline int
 163 xdr_getint32(XDR *xdrs, int32_t *ip)
 164 {
 165         long l;
 166
 167         if (!xdr_getlong(xdrs, &l))
 168                 return (FALSE);
 169         *ip = (int32_t)l;
 170         return (TRUE);
 171 }
 172
 173 static __inline int
 174 xdr_putint32(XDR *xdrs, int32_t *ip)
 175 {
 176         long l;
 177
 178         l = (long)*ip;
 179         return xdr_putlong(xdrs, &l);
 180 }
 181
 182 #define XDR_GETINT32(xdrs, int32p)      xdr_getint32(xdrs, int32p)
 183 #define XDR_PUTINT32(xdrs, int32p)      xdr_putint32(xdrs, int32p)
 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         if ((xdrs)->x_ops->x_destroy)                   \
 212                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 213 #define xdr_destroy(xdrs)                               \
 214         if ((xdrs)->x_ops->x_destroy)                   \
 215                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 216
 217 #define XDR_CONTROL(xdrs, req, op)                      \
 218         if ((xdrs)->x_ops->x_control)                   \
 219                 (*(xdrs)->x_ops->x_control)(xdrs, req, op)
 220 #define xdr_control(xdrs, req, op) XDR_CONTROL(xdrs, req, op)
 221
 222 #define xdr_rpcvers(xdrs, versp) xdr_u_int32_t(xdrs, versp)
 223 #define xdr_rpcprog(xdrs, progp) xdr_u_int32_t(xdrs, progp)
 224 #define xdr_rpcproc(xdrs, procp) xdr_u_int32_t(xdrs, procp)
 225 #define xdr_rpcprot(xdrs, protp) xdr_u_int32_t(xdrs, protp)
 226 #define xdr_rpcport(xdrs, portp) xdr_u_int32_t(xdrs, portp)
 227
 228 /*
 229  * Support struct for discriminated unions.
 230  * You create an array of xdrdiscrim structures, terminated with
 231  * an entry with a null procedure pointer.  The xdr_union routine gets
 232  * the discriminant value and then searches the array of structures
 233  * for a matching value.  If a match is found the associated xdr routine
 234  * is called to handle that part of the union.  If there is
 235  * no match, then a default routine may be called.
 236  * If there is no match and no default routine it is an error.
 237  */
 238 #define NULL_xdrproc_t ((xdrproc_t)0)
 239 struct xdr_discrim {
 240         int     value;
 241         xdrproc_t proc;
 242 };
 243
 244 /*
 245  * In-line routines for fast encode/decode of primitive data types.
 246  * Caveat emptor: these use single memory cycles to get the
 247  * data from the underlying buffer, and will fail to operate
 248  * properly if the data is not aligned.  The standard way to use these
 249  * is to say:
 250  *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 251  *              return (FALSE);
 252  *      <<< macro calls >>>
 253  * where ``count'' is the number of bytes of data occupied
 254  * by the primitive data types.
 255  *
 256  * N.B. and frozen for all time: each data type here uses 4 bytes
 257  * of external representation.
 258  */
 259 #define IXDR_GET_INT32(buf)             ((int32_t)__ntohl((u_int32_t)*(buf)++))
 260 #define IXDR_PUT_INT32(buf, v)          (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 261 #define IXDR_GET_U_INT32(buf)           ((u_int32_t)IXDR_GET_INT32(buf))
 262 #define IXDR_PUT_U_INT32(buf, v)        IXDR_PUT_INT32((buf), ((int32_t)(v)))
 263
 264 #define IXDR_GET_LONG(buf)              ((long)__ntohl((u_int32_t)*(buf)++))
 265 #define IXDR_PUT_LONG(buf, v)           (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 266
 267 #define IXDR_GET_BOOL(buf)              ((bool_t)IXDR_GET_LONG(buf))
 268 #define IXDR_GET_ENUM(buf, t)           ((t)IXDR_GET_LONG(buf))
 269 #define IXDR_GET_U_LONG(buf)            ((u_long)IXDR_GET_LONG(buf))
 270 #define IXDR_GET_SHORT(buf)             ((short)IXDR_GET_LONG(buf))
 271 #define IXDR_GET_U_SHORT(buf)           ((u_short)IXDR_GET_LONG(buf))
 272
 273 #define IXDR_PUT_BOOL(buf, v)           IXDR_PUT_LONG((buf), (v))
 274 #define IXDR_PUT_ENUM(buf, v)           IXDR_PUT_LONG((buf), (v))
 275 #define IXDR_PUT_U_LONG(buf, v)         IXDR_PUT_LONG((buf), (v))
 276 #define IXDR_PUT_SHORT(buf, v)          IXDR_PUT_LONG((buf), (v))
 277 #define IXDR_PUT_U_SHORT(buf, v)        IXDR_PUT_LONG((buf), (v))
 278
 279 /*
 280  * These are the "generic" xdr routines.
 281  */
 282 __BEGIN_DECLS
 283 extern bool_t   xdr_void(void);
 284 extern bool_t   xdr_int(XDR *, int *);
 285 extern bool_t   xdr_u_int(XDR *, u_int *);
 286 extern bool_t   xdr_long(XDR *, long *);
 287 extern bool_t   xdr_u_long(XDR *, u_long *);
 288 extern bool_t   xdr_short(XDR *, short *);
 289 extern bool_t   xdr_u_short(XDR *, u_short *);
 290 extern bool_t   xdr_int16_t(XDR *, int16_t *);
 291 extern bool_t   xdr_u_int16_t(XDR *, u_int16_t *);
 292 extern bool_t   xdr_uint16_t(XDR *, u_int16_t *);
 293 extern bool_t   xdr_int32_t(XDR *, int32_t *);
 294 extern bool_t   xdr_u_int32_t(XDR *, u_int32_t *);
 295 extern bool_t   xdr_uint32_t(XDR *, u_int32_t *);
 296 extern bool_t   xdr_int64_t(XDR *, int64_t *);
 297 extern bool_t   xdr_u_int64_t(XDR *, u_int64_t *);
 298 extern bool_t   xdr_uint64_t(XDR *, u_int64_t *);
 299 extern bool_t   xdr_bool(XDR *, bool_t *);
 300 extern bool_t   xdr_enum(XDR *, enum_t *);
 301 extern bool_t   xdr_array(XDR *, char **, u_int *, u_int, u_int, xdrproc_t);
 302 extern bool_t   xdr_bytes(XDR *, char **, u_int *, u_int);
 303 extern bool_t   xdr_opaque(XDR *, char *, u_int);
 304 extern bool_t   xdr_string(XDR *, char **, u_int);
 305 extern bool_t   xdr_union(XDR *, enum_t *, char *, const struct xdr_discrim *, xdrproc_t);
 306 extern bool_t   xdr_char(XDR *, char *);
 307 extern bool_t   xdr_u_char(XDR *, u_char *);
 308 extern bool_t   xdr_vector(XDR *, char *, u_int, u_int, xdrproc_t);
 309 extern bool_t   xdr_float(XDR *, float *);
 310 extern bool_t   xdr_double(XDR *, double *);
 311 extern bool_t   xdr_quadruple(XDR *, long double *);
 312 extern bool_t   xdr_reference(XDR *, char **, u_int, xdrproc_t);
 313 extern bool_t   xdr_pointer(XDR *, char **, u_int, xdrproc_t);
 314 extern bool_t   xdr_wrapstring(XDR *, char **);
 315 extern void     xdr_free(xdrproc_t, void *);
 316 extern bool_t   xdr_hyper(XDR *, quad_t *);
 317 extern bool_t   xdr_u_hyper(XDR *, u_quad_t *);
 318 extern bool_t   xdr_longlong_t(XDR *, quad_t *);
 319 extern bool_t   xdr_u_longlong_t(XDR *, u_quad_t *);
 320 extern unsigned long    xdr_sizeof(xdrproc_t, void *);
 321 __END_DECLS
 322
 323 /*
 324  * Common opaque bytes objects used by many rpc protocols;
 325  * declared here due to commonality.
 326  */
 327 #define MAX_NETOBJ_SZ 1024
 328 struct netobj {
 329         u_int   n_len;
 330         char    *n_bytes;
 331 };
 332 typedef struct netobj netobj;
 333 extern bool_t   xdr_netobj(XDR *, struct netobj *);
 334
 335 /*
 336  * These are the public routines for the various implementations of
 337  * xdr streams.
 338  */
 339 __BEGIN_DECLS
 340 /* XDR using memory buffers */
 341 extern void   xdrmem_create(XDR *, char *, u_int, enum xdr_op);
 342
 343 /* XDR using stdio library */
 344 #ifdef _STDIO_H_
 345 extern void   xdrstdio_create(XDR *, FILE *, enum xdr_op);
 346 #endif
 347
 348 /* XDR pseudo records for tcp */
 349 extern void   xdrrec_create(XDR *, u_int, u_int, void *,
 350                             int (*)(void *, void *, int),
 351                             int (*)(void *, void *, int));
 352
 353 /* make end of xdr record */
 354 extern bool_t xdrrec_endofrecord(XDR *, int);
 355
 356 /* move to beginning of next record */
 357 extern bool_t xdrrec_skiprecord(XDR *);
 358
 359 /* true if no more input */
 360 extern bool_t xdrrec_eof(XDR *);
 361 extern u_int xdrrec_readbytes(XDR *, caddr_t, u_int);
 362 __END_DECLS
 363
 364 #endif /* !_RPC_XDR_H */