xdr.h

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/* Copyright (c) 2010, 2025, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
/**
  @file windeps/sunrpc/rpc/xdr.h
  External Data Representation Serialization Routines.
*/
 
#ifndef _RPC_XDR_H
#define _RPC_XDR_H 1
 
#ifdef __linux__
#include <features.h>
#endif
 
#include <rpc/types.h>
#include <sys/types.h>
 
/* We need FILE.  */
#include <stdio.h>
 
__BEGIN_DECLS
 
/*
 * XDR provides a conventional way for converting between C data
 * types and an external bit-string representation.  Library supplied
 * routines provide for the conversion on built-in C data types.  These
 * routines and utility routines defined here are used to help implement
 * a type encode/decode routine for each user-defined type.
 *
 * Each data type provides a single procedure which takes two arguments:
 *
 *      bool_t
 *      xdrproc(xdrs, argresp)
 *              XDR *xdrs;
 *              <type> *argresp;
 *
 * xdrs is an instance of a XDR handle, to which or from which the data
 * type is to be converted.  argresp is a pointer to the structure to be
 * converted.  The XDR handle contains an operation field which indicates
 * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
 *
 * XDR_DECODE may allocate space if the pointer argresp is null.  This
 * data can be freed with the XDR_FREE operation.
 *
 * We write only one procedure per data type to make it easy
 * to keep the encode and decode procedures for a data type consistent.
 * In many cases the same code performs all operations on a user defined type,
 * because all the hard work is done in the component type routines.
 * decode as a series of calls on the nested data types.
 */
 
/*
 * Xdr operations.  XDR_ENCODE causes the type to be encoded into the
 * stream.  XDR_DECODE causes the type to be extracted from the stream.
 * XDR_FREE can be used to release the space allocated by an XDR_DECODE
 * request.
 */
enum xdr_op { XDR_ENCODE = 0, XDR_DECODE = 1, XDR_FREE = 2 };
 
/*
 * This is the number of bytes per unit of external data.
 */
#define BYTES_PER_XDR_UNIT (4)
/*
 * This only works if the above is a power of 2.  But it's defined to be
 * 4 by the appropriate RFCs.  So it will work.  And it's normally quicker
 * than the old routine.
 */
#if 1
#define RNDUP(x) (((x) + BYTES_PER_XDR_UNIT - 1) & ~(BYTES_PER_XDR_UNIT - 1))
#else /* this is the old routine */
#define RNDUP(x) \
  ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) * BYTES_PER_XDR_UNIT)
#endif
 
/*
 * The XDR handle.
 * Contains operation which is being applied to the stream,
 * an operations vector for the particular implementation (e.g. see xdr_mem.c),
 * and two private fields for the use of the particular implementation.
 */
typedef struct XDR XDR;
struct XDR {
  enum xdr_op x_op; /* operation; fast additional param */
  struct xdr_ops {
    bool_t (*x_getlong)(XDR *__xdrs, long *__lp);
    /* get a long from underlying stream */
    bool_t (*x_putlong)(XDR *__xdrs, __const long *__lp);
    /* put a long to " */
    bool_t (*x_getbytes)(XDR *__xdrs, caddr_t __addr, u_int __len);
    /* get some bytes from " */
    bool_t (*x_putbytes)(XDR *__xdrs, __const char *__addr, u_int __len);
    /* put some bytes to " */
    u_int (*x_getpostn)(__const XDR *__xdrs);
    /* returns bytes off from beginning */
    bool_t (*x_setpostn)(XDR *__xdrs, u_int __pos);
    /* lets you reposition the stream */
    int32_t *(*x_inline)(XDR *__xdrs, u_int __len);
    /* buf quick ptr to buffered data */
    void (*x_destroy)(XDR *__xdrs);
    /* free privates of this xdr_stream */
    bool_t (*x_getint32)(XDR *__xdrs, int32_t *__ip);
    /* get a int from underlying stream */
    bool_t (*x_putint32)(XDR *__xdrs, __const int32_t *__ip);
    /* put a int to " */
  } *x_ops;
  caddr_t x_public;  /* users' data */
  caddr_t x_private; /* pointer to private data */
  caddr_t x_base;    /* private used for position info */
  u_int x_handy;     /* extra private word */
};
 
/*
 * A xdrproc_t exists for each data type which is to be encoded or decoded.
 *
 * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 * The opaque pointer generally points to a structure of the data type
 * to be decoded.  If this pointer is 0, then the type routines should
 * allocate dynamic storage of the appropriate size and return it.
 * bool_t       (*xdrproc_t)(XDR *, caddr_t *);
 */
typedef bool_t (*xdrproc_t)(XDR *, void *, ...);
 
/*
 * Operations defined on a XDR handle
 *
 * XDR          *xdrs;
 * int32_t      *int32p;
 * long         *longp;
 * caddr_t       addr;
 * u_int         len;
 * u_int         pos;
 */
#define XDR_GETINT32(xdrs, int32p) (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
#define xdr_getint32(xdrs, int32p) (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
 
#define XDR_PUTINT32(xdrs, int32p) (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
#define xdr_putint32(xdrs, int32p) (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
 
#define XDR_GETLONG(xdrs, longp) (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
#define xdr_getlong(xdrs, longp) (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
 
#define XDR_PUTLONG(xdrs, longp) (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
#define xdr_putlong(xdrs, longp) (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
 
#define XDR_GETBYTES(xdrs, addr, len) \
  (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
#define xdr_getbytes(xdrs, addr, len) \
  (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 
#define XDR_PUTBYTES(xdrs, addr, len) \
  (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
#define xdr_putbytes(xdrs, addr, len) \
  (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 
#define XDR_GETPOS(xdrs) (*(xdrs)->x_ops->x_getpostn)(xdrs)
#define xdr_getpos(xdrs) (*(xdrs)->x_ops->x_getpostn)(xdrs)
 
#define XDR_SETPOS(xdrs, pos) (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
#define xdr_setpos(xdrs, pos) (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 
#define XDR_INLINE(xdrs, len) (*(xdrs)->x_ops->x_inline)(xdrs, len)
#define xdr_inline(xdrs, len) (*(xdrs)->x_ops->x_inline)(xdrs, len)
 
#define XDR_DESTROY(xdrs)                                            \
  do {                                                               \
    if ((xdrs)->x_ops->x_destroy) (*(xdrs)->x_ops->x_destroy)(xdrs); \
  } while (0)
#define xdr_destroy(xdrs)                                            \
  do {                                                               \
    if ((xdrs)->x_ops->x_destroy) (*(xdrs)->x_ops->x_destroy)(xdrs); \
  } while (0)
 
/*
 * Support struct for discriminated unions.
 * You create an array of xdrdiscrim structures, terminated with
 * a entry with a null procedure pointer.  The xdr_union routine gets
 * the discriminant value and then searches the array of structures
 * for a matching value.  If a match is found the associated xdr routine
 * is called to handle that part of the union.  If there is
 * no match, then a default routine may be called.
 * If there is no match and no default routine it is an error.
 */
#define NULL_xdrproc_t ((xdrproc_t)0)
struct xdr_discrim {
  int value;
  xdrproc_t proc;
};
 
/*
 * Inline routines for fast encode/decode of primitive data types.
 * Caveat emptor: these use single memory cycles to get the
 * data from the underlying buffer, and will fail to operate
 * properly if the data is not aligned.  The standard way to use these
 * is to say:
 *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 *              return (FALSE);
 *      <<< macro calls >>>
 * where ``count'' is the number of bytes of data occupied
 * by the primitive data types.
 *
 * N.B. and frozen for all time: each data type here uses 4 bytes
 * of external representation.
 */
 
#define IXDR_GET_INT32(buf) ((int32_t)ntohl((uint32_t) * (buf)++))
#define IXDR_PUT_INT32(buf, v) (*(buf)++ = (int32_t)htonl((uint32_t)(v)))
#define IXDR_GET_U_INT32(buf) ((uint32_t)IXDR_GET_INT32(buf))
#define IXDR_PUT_U_INT32(buf, v) IXDR_PUT_INT32(buf, (int32_t)(v))
 
/* WARNING: The IXDR_*_LONG defines are removed by Sun for new platforms
 * and shouldn't be used any longer. Code which use this defines or longs
 * in the RPC code will not work on 64bit Solaris platforms !
 */
#define IXDR_GET_LONG(buf) ((long)IXDR_GET_U_INT32(buf))
#define IXDR_PUT_LONG(buf, v) ((long)IXDR_PUT_INT32(buf, (long)(v)))
#define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
#define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG(buf, (long)(v))
 
#define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
#define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
#define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
#define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
 
#define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
 
/*
 * These are the "generic" xdr routines.
 * None of these can have const applied because it's not possible to
 * know whether the call is a read or a write to the passed parameter
 * also, the XDR structure is always updated by some of these calls.
 */
extern bool_t xdr_void(void) __THROW;
extern bool_t xdr_short(XDR *__xdrs, short *__sp) __THROW;
extern bool_t xdr_u_short(XDR *__xdrs, u_short *__usp) __THROW;
extern bool_t xdr_int(XDR *__xdrs, int *__ip) __THROW;
extern bool_t xdr_u_int(XDR *__xdrs, u_int *__up) __THROW;
extern bool_t xdr_long(XDR *__xdrs, long *__lp) __THROW;
extern bool_t xdr_u_long(XDR *__xdrs, u_long *__ulp) __THROW;
extern bool_t xdr_hyper(XDR *__xdrs, quad_t *__llp) __THROW;
extern bool_t xdr_u_hyper(XDR *__xdrs, u_quad_t *__ullp) __THROW;
extern bool_t xdr_longlong_t(XDR *__xdrs, quad_t *__llp) __THROW;
extern bool_t xdr_u_longlong_t(XDR *__xdrs, u_quad_t *__ullp) __THROW;
extern bool_t xdr_int8_t(XDR *__xdrs, int8_t *__ip) __THROW;
extern bool_t xdr_uint8_t(XDR *__xdrs, uint8_t *__up) __THROW;
extern bool_t xdr_int16_t(XDR *__xdrs, int16_t *__ip) __THROW;
extern bool_t xdr_uint16_t(XDR *__xdrs, uint16_t *__up) __THROW;
extern bool_t xdr_int32_t(XDR *__xdrs, int32_t *__ip) __THROW;
extern bool_t xdr_uint32_t(XDR *__xdrs, uint32_t *__up) __THROW;
extern bool_t xdr_int64_t(XDR *__xdrs, int64_t *__ip) __THROW;
extern bool_t xdr_uint64_t(XDR *__xdrs, uint64_t *__up) __THROW;
extern bool_t xdr_quad_t(XDR *__xdrs, quad_t *__ip) __THROW;
extern bool_t xdr_u_quad_t(XDR *__xdrs, u_quad_t *__up) __THROW;
extern bool_t xdr_bool(XDR *__xdrs, bool_t *__bp) __THROW;
extern bool_t xdr_enum(XDR *__xdrs, enum_t *__ep) __THROW;
extern bool_t xdr_array(XDR *_xdrs, caddr_t *__addrp, u_int *__sizep,
                        u_int __maxsize, u_int __elsize,
                        xdrproc_t __elproc) __THROW;
extern bool_t xdr_bytes(XDR *__xdrs, char **__cpp, u_int *__sizep,
                        u_int __maxsize) __THROW;
extern bool_t xdr_opaque(XDR *__xdrs, caddr_t __cp, u_int __cnt) __THROW;
extern bool_t xdr_string(XDR *__xdrs, char **__cpp, u_int __maxsize) __THROW;
extern bool_t xdr_union(XDR *__xdrs, enum_t *__dscmp, char *__unp,
                        __const struct xdr_discrim *__choices,
                        xdrproc_t __dfault) __THROW;
extern bool_t xdr_char(XDR *__xdrs, char *__cp) __THROW;
extern bool_t xdr_u_char(XDR *__xdrs, u_char *__cp) __THROW;
extern bool_t xdr_vector(XDR *__xdrs, char *__basep, u_int __nelem,
                         u_int __elemsize, xdrproc_t __xdr_elem) __THROW;
extern bool_t xdr_float(XDR *__xdrs, float *__fp) __THROW;
extern bool_t xdr_double(XDR *__xdrs, double *__dp) __THROW;
extern bool_t xdr_reference(XDR *__xdrs, caddr_t *__xpp, u_int __size,
                            xdrproc_t __proc) __THROW;
extern bool_t xdr_pointer(XDR *__xdrs, char **__objpp, u_int __obj_size,
                          xdrproc_t __xdr_obj) __THROW;
extern bool_t xdr_wrapstring(XDR *__xdrs, char **__cpp) __THROW;
extern u_long xdr_sizeof(xdrproc_t, void *) __THROW;
 
/*
 * Common opaque bytes objects used by many rpc protocols;
 * declared here due to commonality.
 */
#define MAX_NETOBJ_SZ 1024
struct netobj {
  u_int n_len;
  char *n_bytes;
};
typedef struct netobj netobj;
extern bool_t xdr_netobj(XDR *__xdrs, struct netobj *__np) __THROW;
 
/*
 * These are the public routines for the various implementations of
 * xdr streams.
 */
 
/* XDR using memory buffers */
extern void xdrmem_create(XDR *__xdrs, __const caddr_t __addr, u_int __size,
                          enum xdr_op __xop) __THROW;
 
/* XDR using stdio library */
extern void xdrstdio_create(XDR *__xdrs, FILE *__file,
                            enum xdr_op __xop) __THROW;
 
/* XDR pseudo records for tcp */
extern void xdrrec_create(XDR *__xdrs, u_int __sendsize, u_int __recvsize,
                          caddr_t __tcp_handle,
                          int (*__readit)(char *, char *, int),
                          int (*__writeit)(char *, char *, int)) __THROW;
 
/* make end of xdr record */
extern bool_t xdrrec_endofrecord(XDR *__xdrs, bool_t __sendnow) __THROW;
 
/* move to beginning of next record */
extern bool_t xdrrec_skiprecord(XDR *__xdrs) __THROW;
 
/* true if no more input */
extern bool_t xdrrec_eof(XDR *__xdrs) __THROW;
 
/* free memory buffers for xdr */
extern void xdr_free(xdrproc_t __proc, char *__objp) __THROW;
 
__END_DECLS
 
#endif /* rpc/xdr.h */