include/rpc/xdr.h

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  *      from: @(#)xdr.h 1.19 87/04/22 SMI
  29  *      from: @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC
  30  * $NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $
  31  * $FreeBSD: src/include/rpc/xdr.h,v 1.23 2003/03/07 13:19:40 nectar Exp $
  32  */
  33
  34 /*
  35  * xdr.h, External Data Representation Serialization Routines.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  */
  39
  40 #ifndef _RPC_XDR_H
  41 #define _RPC_XDR_H
  42 #include <sys/cdefs.h>
  43
  44 /*
  45  * XDR provides a conventional way for converting between C data
  46  * types and an external bit-string representation.  Library supplied
  47  * routines provide for the conversion on built-in C data types.  These
  48  * routines and utility routines defined here are used to help implement
  49  * a type encode/decode routine for each user-defined type.
  50  *
  51  * Each data type provides a single procedure which takes two arguments:
  52  *
  53  *      bool_t
  54  *      xdrproc(xdrs, argresp)
  55  *              XDR *xdrs;
  56  *              <type> *argresp;
  57  *
  58  * xdrs is an instance of a XDR handle, to which or from which the data
  59  * type is to be converted.  argresp is a pointer to the structure to be
  60  * converted.  The XDR handle contains an operation field which indicates
  61  * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
  62  *
  63  * XDR_DECODE may allocate space if the pointer argresp is null.  This
  64  * data can be freed with the XDR_FREE operation.
  65  *
  66  * We write only one procedure per data type to make it easy
  67  * to keep the encode and decode procedures for a data type consistent.
  68  * In many cases the same code performs all operations on a user defined type,
  69  * because all the hard work is done in the component type routines.
  70  * decode as a series of calls on the nested data types.
  71  */
  72
  73 /*
  74  * Xdr operations.  XDR_ENCODE causes the type to be encoded into the
  75  * stream.  XDR_DECODE causes the type to be extracted from the stream.
  76  * XDR_FREE can be used to release the space allocated by an XDR_DECODE
  77  * request.
  78  */
  79 enum xdr_op {
  80         XDR_ENCODE=0,
  81         XDR_DECODE=1,
  82         XDR_FREE=2
  83 };
  84
  85 /*
  86  * This is the number of bytes per unit of external data.
  87  */
  88 #define BYTES_PER_XDR_UNIT      (4)
  89 #define RNDUP(x)  ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
  90                     * BYTES_PER_XDR_UNIT)
  91
  92 /*
  93  * The XDR handle.
  94  * Contains operation which is being applied to the stream,
  95  * an operations vector for the particular implementation (e.g. see xdr_mem.c),
  96  * and two private fields for the use of the particular implementation.
  97  */
  98 typedef struct __rpc_xdr {
  99         enum xdr_op     x_op;           /* operation; fast additional param */
 100         const struct xdr_ops {
 101                 /* get a long from underlying stream */
 102                 bool_t  (*x_getlong)(struct __rpc_xdr *, long *);
 103                 /* put a long to " */
 104                 bool_t  (*x_putlong)(struct __rpc_xdr *, const long *);
 105                 /* get some bytes from " */
 106                 bool_t  (*x_getbytes)(struct __rpc_xdr *, char *, u_int);
 107                 /* put some bytes to " */
 108                 bool_t  (*x_putbytes)(struct __rpc_xdr *, const char *, u_int);
 109                 /* returns bytes off from beginning */
 110                 u_int   (*x_getpostn)(struct __rpc_xdr *);
 111                 /* lets you reposition the stream */
 112                 bool_t  (*x_setpostn)(struct __rpc_xdr *, u_int);
 113                 /* buf quick ptr to buffered data */
 114                 int32_t *(*x_inline)(struct __rpc_xdr *, u_int);
 115                 /* free privates of this xdr_stream */
 116                 void    (*x_destroy)(struct __rpc_xdr *);
 117                 bool_t  (*x_control)(struct __rpc_xdr *, int, void *);
 118         } *x_ops;
 119         char *          x_public;       /* users' data */
 120         void *          x_private;      /* pointer to private data */
 121         char *          x_base;         /* private used for position info */
 122         u_int           x_handy;        /* extra private word */
 123 } XDR;
 124
 125 /*
 126  * A xdrproc_t exists for each data type which is to be encoded or decoded.
 127  *
 128  * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 129  * The opaque pointer generally points to a structure of the data type
 130  * to be decoded.  If this pointer is 0, then the type routines should
 131  * allocate dynamic storage of the appropriate size and return it.
 132  */
 133 #ifdef _KERNEL
 134 typedef bool_t (*xdrproc_t)(XDR *, void *, u_int);
 135 #else
 136 /*
 137  * XXX can't actually prototype it, because some take three args!!!
 138  */
 139 typedef bool_t (*xdrproc_t)(XDR *, ...);
 140 #endif
 141
 142 /*
 143  * Operations defined on a XDR handle
 144  *
 145  * XDR          *xdrs;
 146  * long         *longp;
 147  * char *        addr;
 148  * u_int         len;
 149  * u_int         pos;
 150  */
 151 #define XDR_GETLONG(xdrs, longp)                        \
 152         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 153 #define xdr_getlong(xdrs, longp)                        \
 154         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 155
 156 #define XDR_PUTLONG(xdrs, longp)                        \
 157         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 158 #define xdr_putlong(xdrs, longp)                        \
 159         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 160
 161 static __inline int
 162 xdr_getint32(XDR *xdrs, int32_t *ip)
 163 {
 164         long l;
 165
 166         if (!xdr_getlong(xdrs, &l))
 167                 return (FALSE);
 168         *ip = (int32_t)l;
 169         return (TRUE);
 170 }
 171
 172 static __inline int
 173 xdr_putint32(XDR *xdrs, int32_t *ip)
 174 {
 175         long l;
 176
 177         l = (long)*ip;
 178         return xdr_putlong(xdrs, &l);
 179 }
 180
 181 #define XDR_GETINT32(xdrs, int32p)      xdr_getint32(xdrs, int32p)
 182 #define XDR_PUTINT32(xdrs, int32p)      xdr_putint32(xdrs, int32p)
 183
 184 #define XDR_GETBYTES(xdrs, addr, len)                   \
 185         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 186 #define xdr_getbytes(xdrs, addr, len)                   \
 187         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 188
 189 #define XDR_PUTBYTES(xdrs, addr, len)                   \
 190         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 191 #define xdr_putbytes(xdrs, addr, len)                   \
 192         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 193
 194 #define XDR_GETPOS(xdrs)                                \
 195         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 196 #define xdr_getpos(xdrs)                                \
 197         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 198
 199 #define XDR_SETPOS(xdrs, pos)                           \
 200         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 201 #define xdr_setpos(xdrs, pos)                           \
 202         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 203
 204 #define XDR_INLINE(xdrs, len)                           \
 205         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 206 #define xdr_inline(xdrs, len)                           \
 207         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 208
 209 #define XDR_DESTROY(xdrs)                               \
 210         if ((xdrs)->x_ops->x_destroy)                   \
 211                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 212 #define xdr_destroy(xdrs)                               \
 213         if ((xdrs)->x_ops->x_destroy)                   \
 214                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 215
 216 #define XDR_CONTROL(xdrs, req, op)                      \
 217         if ((xdrs)->x_ops->x_control)                   \
 218                 (*(xdrs)->x_ops->x_control)(xdrs, req, op)
 219 #define xdr_control(xdrs, req, op) XDR_CONTROL(xdrs, req, op)
 220
 221 /*
 222  * Solaris strips the '_t' from these types -- not sure why.
 223  * But, let's be compatible.
 224  */
 225 #define xdr_rpcvers(xdrs, versp) xdr_u_int32(xdrs, versp)
 226 #define xdr_rpcprog(xdrs, progp) xdr_u_int32(xdrs, progp)
 227 #define xdr_rpcproc(xdrs, procp) xdr_u_int32(xdrs, procp)
 228 #define xdr_rpcprot(xdrs, protp) xdr_u_int32(xdrs, protp)
 229 #define xdr_rpcport(xdrs, portp) xdr_u_int32(xdrs, portp)
 230
 231 /*
 232  * Support struct for discriminated unions.
 233  * You create an array of xdrdiscrim structures, terminated with
 234  * an entry with a null procedure pointer.  The xdr_union routine gets
 235  * the discriminant value and then searches the array of structures
 236  * for a matching value.  If a match is found the associated xdr routine
 237  * is called to handle that part of the union.  If there is
 238  * no match, then a default routine may be called.
 239  * If there is no match and no default routine it is an error.
 240  */
 241 #define NULL_xdrproc_t ((xdrproc_t)0)
 242 struct xdr_discrim {
 243         int     value;
 244         xdrproc_t proc;
 245 };
 246
 247 /*
 248  * In-line routines for fast encode/decode of primitive data types.
 249  * Caveat emptor: these use single memory cycles to get the
 250  * data from the underlying buffer, and will fail to operate
 251  * properly if the data is not aligned.  The standard way to use these
 252  * is to say:
 253  *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 254  *              return (FALSE);
 255  *      <<< macro calls >>>
 256  * where ``count'' is the number of bytes of data occupied
 257  * by the primitive data types.
 258  *
 259  * N.B. and frozen for all time: each data type here uses 4 bytes
 260  * of external representation.
 261  */
 262 #define IXDR_GET_INT32(buf)             ((int32_t)__ntohl((u_int32_t)*(buf)++))
 263 #define IXDR_PUT_INT32(buf, v)          (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 264 #define IXDR_GET_U_INT32(buf)           ((u_int32_t)IXDR_GET_INT32(buf))
 265 #define IXDR_PUT_U_INT32(buf, v)        IXDR_PUT_INT32((buf), ((int32_t)(v)))
 266
 267 #define IXDR_GET_LONG(buf)              ((long)__ntohl((u_int32_t)*(buf)++))
 268 #define IXDR_PUT_LONG(buf, v)           (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 269
 270 #define IXDR_GET_BOOL(buf)              ((bool_t)IXDR_GET_LONG(buf))
 271 #define IXDR_GET_ENUM(buf, t)           ((t)IXDR_GET_LONG(buf))
 272 #define IXDR_GET_U_LONG(buf)            ((u_long)IXDR_GET_LONG(buf))
 273 #define IXDR_GET_SHORT(buf)             ((short)IXDR_GET_LONG(buf))
 274 #define IXDR_GET_U_SHORT(buf)           ((u_short)IXDR_GET_LONG(buf))
 275
 276 #define IXDR_PUT_BOOL(buf, v)           IXDR_PUT_LONG((buf), (v))
 277 #define IXDR_PUT_ENUM(buf, v)           IXDR_PUT_LONG((buf), (v))
 278 #define IXDR_PUT_U_LONG(buf, v)         IXDR_PUT_LONG((buf), (v))
 279 #define IXDR_PUT_SHORT(buf, v)          IXDR_PUT_LONG((buf), (v))
 280 #define IXDR_PUT_U_SHORT(buf, v)        IXDR_PUT_LONG((buf), (v))
 281
 282 /*
 283  * These are the "generic" xdr routines.
 284  */
 285 __BEGIN_DECLS
 286 extern bool_t   xdr_void(void);
 287 extern bool_t   xdr_int(XDR *, int *);
 288 extern bool_t   xdr_u_int(XDR *, u_int *);
 289 extern bool_t   xdr_long(XDR *, long *);
 290 extern bool_t   xdr_u_long(XDR *, u_long *);
 291 extern bool_t   xdr_short(XDR *, short *);
 292 extern bool_t   xdr_u_short(XDR *, u_short *);
 293 extern bool_t   xdr_int16_t(XDR *, int16_t *);
 294 extern bool_t   xdr_u_int16_t(XDR *, u_int16_t *);
 295 extern bool_t   xdr_int32_t(XDR *, int32_t *);
 296 extern bool_t   xdr_u_int32_t(XDR *, u_int32_t *);
 297 extern bool_t   xdr_uint32_t(XDR *, u_int32_t *);
 298 extern bool_t   xdr_int64_t(XDR *, int64_t *);
 299 extern bool_t   xdr_u_int64_t(XDR *, u_int64_t *);
 300 extern bool_t   xdr_uint64_t(XDR *, u_int64_t *);
 301 extern bool_t   xdr_bool(XDR *, bool_t *);
 302 extern bool_t   xdr_enum(XDR *, enum_t *);
 303 extern bool_t   xdr_array(XDR *, char **, u_int *, u_int, u_int, xdrproc_t);
 304 extern bool_t   xdr_bytes(XDR *, char **, u_int *, u_int);
 305 extern bool_t   xdr_opaque(XDR *, char *, u_int);
 306 extern bool_t   xdr_string(XDR *, char **, u_int);
 307 extern bool_t   xdr_union(XDR *, enum_t *, char *, const struct xdr_discrim *, xdrproc_t);
 308 extern bool_t   xdr_char(XDR *, char *);
 309 extern bool_t   xdr_u_char(XDR *, u_char *);
 310 extern bool_t   xdr_vector(XDR *, char *, u_int, u_int, xdrproc_t);
 311 extern bool_t   xdr_float(XDR *, float *);
 312 extern bool_t   xdr_double(XDR *, double *);
 313 extern bool_t   xdr_quadruple(XDR *, long double *);
 314 extern bool_t   xdr_reference(XDR *, char **, u_int, xdrproc_t);
 315 extern bool_t   xdr_pointer(XDR *, char **, u_int, xdrproc_t);
 316 extern bool_t   xdr_wrapstring(XDR *, char **);
 317 extern void     xdr_free(xdrproc_t, void *);
 318 extern bool_t   xdr_hyper(XDR *, quad_t *);
 319 extern bool_t   xdr_u_hyper(XDR *, u_quad_t *);
 320 extern bool_t   xdr_longlong_t(XDR *, quad_t *);
 321 extern bool_t   xdr_u_longlong_t(XDR *, u_quad_t *);
 322 extern unsigned long xdr_sizeof(xdrproc_t, void *);
 323 __END_DECLS
 324
 325 /*
 326  * Common opaque bytes objects used by many rpc protocols;
 327  * declared here due to commonality.
 328  */
 329 #define MAX_NETOBJ_SZ 1024
 330 struct netobj {
 331         u_int   n_len;
 332         char    *n_bytes;
 333 };
 334 typedef struct netobj netobj;
 335 extern bool_t   xdr_netobj(XDR *, struct netobj *);
 336
 337 /*
 338  * These are the public routines for the various implementations of
 339  * xdr streams.
 340  */
 341 __BEGIN_DECLS
 342 /* XDR using memory buffers */
 343 extern void   xdrmem_create(XDR *, char *, u_int, enum xdr_op);
 344
 345 /* XDR using stdio library */
 346 #ifdef _STDIO_H_
 347 extern void   xdrstdio_create(XDR *, FILE *, enum xdr_op);
 348 #endif
 349
 350 /* XDR pseudo records for tcp */
 351 extern void   xdrrec_create(XDR *, u_int, u_int, void *,
 352                             int (*)(void *, void *, int),
 353                             int (*)(void *, void *, int));
 354
 355 /* make end of xdr record */
 356 extern bool_t xdrrec_endofrecord(XDR *, int);
 357
 358 /* move to beginning of next record */
 359 extern bool_t xdrrec_skiprecord(XDR *);
 360
 361 /* true if no more input */
 362 extern bool_t xdrrec_eof(XDR *);
 363 extern u_int xdrrec_readbytes(XDR *, caddr_t, u_int);
 364 __END_DECLS
 365
 366 #endif /* !_RPC_XDR_H */