include/rpc/xdr.h

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  *      from: @(#)xdr.h 1.19 87/04/22 SMI
  30  *      from: @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC
  31  * $NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $
  32  * $FreeBSD: src/include/rpc/xdr.h,v 1.23 2003/03/07 13:19:40 nectar Exp $
  33  * $DragonFly: src/include/rpc/xdr.h,v 1.3 2003/11/14 01:01:50 dillon Exp $
  34  */
  35
  36 /*
  37  * xdr.h, External Data Representation Serialization Routines.
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  */
  41
  42 #ifndef _RPC_XDR_H
  43 #define _RPC_XDR_H
  44 #include <sys/cdefs.h>
  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  */
  81 enum 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 #define RNDUP(x)  ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
  92                     * BYTES_PER_XDR_UNIT)
  93
  94 /*
  95  * The XDR handle.
  96  * Contains operation which is being applied to the stream,
  97  * an operations vector for the particular implementation (e.g. see xdr_mem.c),
  98  * and two private fields for the use of the particular implementation.
  99  */
 100 typedef struct __rpc_xdr {
 101         enum xdr_op     x_op;           /* operation; fast additional param */
 102         const struct xdr_ops {
 103                 /* get a long from underlying stream */
 104                 bool_t  (*x_getlong)(struct __rpc_xdr *, long *);
 105                 /* put a long to " */
 106                 bool_t  (*x_putlong)(struct __rpc_xdr *, const long *);
 107                 /* get some bytes from " */
 108                 bool_t  (*x_getbytes)(struct __rpc_xdr *, char *, u_int);
 109                 /* put some bytes to " */
 110                 bool_t  (*x_putbytes)(struct __rpc_xdr *, const char *, u_int);
 111                 /* returns bytes off from beginning */
 112                 u_int   (*x_getpostn)(struct __rpc_xdr *);
 113                 /* lets you reposition the stream */
 114                 bool_t  (*x_setpostn)(struct __rpc_xdr *, u_int);
 115                 /* buf quick ptr to buffered data */
 116                 int32_t *(*x_inline)(struct __rpc_xdr *, u_int);
 117                 /* free privates of this xdr_stream */
 118                 void    (*x_destroy)(struct __rpc_xdr *);
 119                 bool_t  (*x_control)(struct __rpc_xdr *, int, void *);
 120         } *x_ops;
 121         char *          x_public;       /* users' data */
 122         void *          x_private;      /* pointer to private data */
 123         char *          x_base;         /* private used for position info */
 124         u_int           x_handy;        /* extra private word */
 125 } XDR;
 126
 127 /*
 128  * A xdrproc_t exists for each data type which is to be encoded or decoded.
 129  *
 130  * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 131  * The opaque pointer generally points to a structure of the data type
 132  * to be decoded.  If this pointer is 0, then the type routines should
 133  * allocate dynamic storage of the appropriate size and return it.
 134  */
 135 #ifdef _KERNEL
 136 typedef bool_t (*xdrproc_t)(XDR *, void *, u_int);
 137 #else
 138 /*
 139  * XXX can't actually prototype it, because some take three args!!!
 140  */
 141 typedef bool_t (*xdrproc_t)(XDR *, ...);
 142 #endif
 143
 144 /*
 145  * Operations defined on a XDR handle
 146  *
 147  * XDR          *xdrs;
 148  * long         *longp;
 149  * char *        addr;
 150  * u_int         len;
 151  * u_int         pos;
 152  */
 153 #define XDR_GETLONG(xdrs, longp)                        \
 154         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 155 #define xdr_getlong(xdrs, longp)                        \
 156         (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 157
 158 #define XDR_PUTLONG(xdrs, longp)                        \
 159         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 160 #define xdr_putlong(xdrs, longp)                        \
 161         (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 162
 163 static __inline int
 164 xdr_getint32(XDR *xdrs, int32_t *ip)
 165 {
 166         long l;
 167
 168         if (!xdr_getlong(xdrs, &l))
 169                 return (FALSE);
 170         *ip = (int32_t)l;
 171         return (TRUE);
 172 }
 173
 174 static __inline int
 175 xdr_putint32(XDR *xdrs, int32_t *ip)
 176 {
 177         long l;
 178
 179         l = (long)*ip;
 180         return xdr_putlong(xdrs, &l);
 181 }
 182
 183 #define XDR_GETINT32(xdrs, int32p)      xdr_getint32(xdrs, int32p)
 184 #define XDR_PUTINT32(xdrs, int32p)      xdr_putint32(xdrs, int32p)
 185
 186 #define XDR_GETBYTES(xdrs, addr, len)                   \
 187         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 188 #define xdr_getbytes(xdrs, addr, len)                   \
 189         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 190
 191 #define XDR_PUTBYTES(xdrs, addr, len)                   \
 192         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 193 #define xdr_putbytes(xdrs, addr, len)                   \
 194         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 195
 196 #define XDR_GETPOS(xdrs)                                \
 197         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 198 #define xdr_getpos(xdrs)                                \
 199         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 200
 201 #define XDR_SETPOS(xdrs, pos)                           \
 202         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 203 #define xdr_setpos(xdrs, pos)                           \
 204         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 205
 206 #define XDR_INLINE(xdrs, len)                           \
 207         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 208 #define xdr_inline(xdrs, len)                           \
 209         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 210
 211 #define XDR_DESTROY(xdrs)                               \
 212         if ((xdrs)->x_ops->x_destroy)                   \
 213                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 214 #define xdr_destroy(xdrs)                               \
 215         if ((xdrs)->x_ops->x_destroy)                   \
 216                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 217
 218 #define XDR_CONTROL(xdrs, req, op)                      \
 219         if ((xdrs)->x_ops->x_control)                   \
 220                 (*(xdrs)->x_ops->x_control)(xdrs, req, op)
 221 #define xdr_control(xdrs, req, op) XDR_CONTROL(xdrs, req, op)
 222
 223 /*
 224  * Solaris strips the '_t' from these types -- not sure why.
 225  * But, let's be compatible.
 226  */
 227 #define xdr_rpcvers(xdrs, versp) xdr_u_int32(xdrs, versp)
 228 #define xdr_rpcprog(xdrs, progp) xdr_u_int32(xdrs, progp)
 229 #define xdr_rpcproc(xdrs, procp) xdr_u_int32(xdrs, procp)
 230 #define xdr_rpcprot(xdrs, protp) xdr_u_int32(xdrs, protp)
 231 #define xdr_rpcport(xdrs, portp) xdr_u_int32(xdrs, portp)
 232
 233 /*
 234  * Support struct for discriminated unions.
 235  * You create an array of xdrdiscrim structures, terminated with
 236  * an entry with a null procedure pointer.  The xdr_union routine gets
 237  * the discriminant value and then searches the array of structures
 238  * for a matching value.  If a match is found the associated xdr routine
 239  * is called to handle that part of the union.  If there is
 240  * no match, then a default routine may be called.
 241  * If there is no match and no default routine it is an error.
 242  */
 243 #define NULL_xdrproc_t ((xdrproc_t)0)
 244 struct xdr_discrim {
 245         int     value;
 246         xdrproc_t proc;
 247 };
 248
 249 /*
 250  * In-line routines for fast encode/decode of primitive data types.
 251  * Caveat emptor: these use single memory cycles to get the
 252  * data from the underlying buffer, and will fail to operate
 253  * properly if the data is not aligned.  The standard way to use these
 254  * is to say:
 255  *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 256  *              return (FALSE);
 257  *      <<< macro calls >>>
 258  * where ``count'' is the number of bytes of data occupied
 259  * by the primitive data types.
 260  *
 261  * N.B. and frozen for all time: each data type here uses 4 bytes
 262  * of external representation.
 263  */
 264 #define IXDR_GET_INT32(buf)             ((int32_t)__ntohl((u_int32_t)*(buf)++))
 265 #define IXDR_PUT_INT32(buf, v)          (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 266 #define IXDR_GET_U_INT32(buf)           ((u_int32_t)IXDR_GET_INT32(buf))
 267 #define IXDR_PUT_U_INT32(buf, v)        IXDR_PUT_INT32((buf), ((int32_t)(v)))
 268
 269 #define IXDR_GET_LONG(buf)              ((long)__ntohl((u_int32_t)*(buf)++))
 270 #define IXDR_PUT_LONG(buf, v)           (*(buf)++ =(int32_t)__htonl((u_int32_t)v))
 271
 272 #define IXDR_GET_BOOL(buf)              ((bool_t)IXDR_GET_LONG(buf))
 273 #define IXDR_GET_ENUM(buf, t)           ((t)IXDR_GET_LONG(buf))
 274 #define IXDR_GET_U_LONG(buf)            ((u_long)IXDR_GET_LONG(buf))
 275 #define IXDR_GET_SHORT(buf)             ((short)IXDR_GET_LONG(buf))
 276 #define IXDR_GET_U_SHORT(buf)           ((u_short)IXDR_GET_LONG(buf))
 277
 278 #define IXDR_PUT_BOOL(buf, v)           IXDR_PUT_LONG((buf), (v))
 279 #define IXDR_PUT_ENUM(buf, v)           IXDR_PUT_LONG((buf), (v))
 280 #define IXDR_PUT_U_LONG(buf, v)         IXDR_PUT_LONG((buf), (v))
 281 #define IXDR_PUT_SHORT(buf, v)          IXDR_PUT_LONG((buf), (v))
 282 #define IXDR_PUT_U_SHORT(buf, v)        IXDR_PUT_LONG((buf), (v))
 283
 284 /*
 285  * These are the "generic" xdr routines.
 286  */
 287 __BEGIN_DECLS
 288 extern bool_t   xdr_void(void);
 289 extern bool_t   xdr_int(XDR *, int *);
 290 extern bool_t   xdr_u_int(XDR *, u_int *);
 291 extern bool_t   xdr_long(XDR *, long *);
 292 extern bool_t   xdr_u_long(XDR *, u_long *);
 293 extern bool_t   xdr_short(XDR *, short *);
 294 extern bool_t   xdr_u_short(XDR *, u_short *);
 295 extern bool_t   xdr_int16_t(XDR *, int16_t *);
 296 extern bool_t   xdr_u_int16_t(XDR *, u_int16_t *);
 297 extern bool_t   xdr_int32_t(XDR *, int32_t *);
 298 extern bool_t   xdr_u_int32_t(XDR *, u_int32_t *);
 299 extern bool_t   xdr_int64_t(XDR *, int64_t *);
 300 extern bool_t   xdr_u_int64_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 __END_DECLS
 323
 324 /*
 325  * Common opaque bytes objects used by many rpc protocols;
 326  * declared here due to commonality.
 327  */
 328 #define MAX_NETOBJ_SZ 1024
 329 struct netobj {
 330         u_int   n_len;
 331         char    *n_bytes;
 332 };
 333 typedef struct netobj netobj;
 334 extern bool_t   xdr_netobj(XDR *, struct netobj *);
 335
 336 /*
 337  * These are the public routines for the various implementations of
 338  * xdr streams.
 339  */
 340 __BEGIN_DECLS
 341 /* XDR using memory buffers */
 342 extern void   xdrmem_create(XDR *, char *, u_int, enum xdr_op);
 343
 344 /* XDR using stdio library */
 345 #ifdef _STDIO_H_
 346 extern void   xdrstdio_create(XDR *, FILE *, enum xdr_op);
 347 #endif
 348
 349 /* XDR pseudo records for tcp */
 350 extern void   xdrrec_create(XDR *, u_int, u_int, void *,
 351                             int (*)(void *, void *, int),
 352                             int (*)(void *, void *, int));
 353
 354 /* make end of xdr record */
 355 extern bool_t xdrrec_endofrecord(XDR *, int);
 356
 357 /* move to beginning of next record */
 358 extern bool_t xdrrec_skiprecord(XDR *);
 359
 360 /* true if no more input */
 361 extern bool_t xdrrec_eof(XDR *);
 362 extern u_int xdrrec_readbytes(XDR *, caddr_t, u_int);
 363 __END_DECLS
 364
 365 #endif /* !_RPC_XDR_H */