1/* $NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $ */ 2 3/*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2009, Sun Microsystems, Inc. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * - Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * - Neither the name of Sun Microsystems, 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 "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * xdr.h, External Data Representation Serialization Routines. 35 * 36 * Copyright (C) 1984, Sun Microsystems, Inc. 37 */ 38 39#ifndef _KRPC_XDR_H 40#define _KRPC_XDR_H 41#include <sys/cdefs.h> 42 43/* 44 * XDR provides a conventional way for converting between C data 45 * types and an external bit-string representation. Library supplied 46 * routines provide for the conversion on built-in C data types. These 47 * routines and utility routines defined here are used to help implement 48 * a type encode/decode routine for each user-defined type. 49 * 50 * Each data type provides a single procedure which takes two arguments: 51 * 52 * bool_t 53 * xdrproc(xdrs, argresp) 54 * XDR *xdrs; 55 * <type> *argresp; 56 * 57 * xdrs is an instance of a XDR handle, to which or from which the data 58 * type is to be converted. argresp is a pointer to the structure to be 59 * converted. The XDR handle contains an operation field which indicates 60 * which of the operations (ENCODE, DECODE * or FREE) is to be performed. 61 * 62 * XDR_DECODE may allocate space if the pointer argresp is null. This 63 * data can be freed with the XDR_FREE operation. 64 * 65 * We write only one procedure per data type to make it easy 66 * to keep the encode and decode procedures for a data type consistent. 67 * In many cases the same code performs all operations on a user defined type, 68 * because all the hard work is done in the component type routines. 69 * decode as a series of calls on the nested data types. 70 */ 71 72/* 73 * Xdr operations. XDR_ENCODE causes the type to be encoded into the 74 * stream. XDR_DECODE causes the type to be extracted from the stream. 75 * XDR_FREE can be used to release the space allocated by an XDR_DECODE 76 * request. 77 */ 78enum xdr_op { 79 XDR_ENCODE=0, 80 XDR_DECODE=1, 81 XDR_FREE=2 82}; 83 84/* 85 * This is the number of bytes per unit of external data. 86 */ 87#define BYTES_PER_XDR_UNIT (4) 88#define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \ 89 * BYTES_PER_XDR_UNIT) 90 91/* 92 * The XDR handle. 93 * Contains operation which is being applied to the stream, 94 * an operations vector for the particular implementation (e.g. see xdr_mem.c), 95 * and two private fields for the use of the particular implementation. 96 */ 97typedef struct XDR { 98 enum xdr_op x_op; /* operation; fast additional param */ 99 const struct xdr_ops { 100 /* get a long from underlying stream */ 101 bool_t (*x_getlong)(struct XDR *, long *); 102 /* put a long to " */ 103 bool_t (*x_putlong)(struct XDR *, const long *); 104 /* get some bytes from " */ 105 bool_t (*x_getbytes)(struct XDR *, char *, u_int); 106 /* put some bytes to " */ 107 bool_t (*x_putbytes)(struct XDR *, const char *, u_int); 108 /* returns bytes off from beginning */ 109 u_int (*x_getpostn)(struct XDR *); 110 /* lets you reposition the stream */ 111 bool_t (*x_setpostn)(struct XDR *, u_int); 112 /* buf quick ptr to buffered data */ 113 int32_t *(*x_inline)(struct XDR *, u_int); 114 /* free privates of this xdr_stream */ 115 void (*x_destroy)(struct XDR *); 116 bool_t (*x_control)(struct XDR *, int, void *); 117 } *x_ops; 118 char * x_public; /* users' data */ 119 void * x_private; /* pointer to private data */ 120 char * x_base; /* private used for position info */ 121 u_int x_handy; /* extra private word */ 122} XDR; 123 124/* 125 * A xdrproc_t exists for each data type which is to be encoded or decoded. 126 * 127 * The second argument to the xdrproc_t is a pointer to an opaque pointer. 128 * The opaque pointer generally points to a structure of the data type 129 * to be decoded. If this pointer is 0, then the type routines should 130 * allocate dynamic storage of the appropriate size and return it. 131 */ 132#ifdef _KERNEL 133typedef bool_t (*xdrproc_t)(XDR *, void *, ...); 134#else 135/* 136 * XXX can't actually prototype it, because some take three args!!! 137 */ 138typedef bool_t (*xdrproc_t)(XDR *, ...); 139#endif 140 141/* 142 * Operations defined on a XDR handle 143 * 144 * XDR *xdrs; 145 * long *longp; 146 * char * addr; 147 * u_int len; 148 * u_int pos; 149 */ 150#define XDR_GETLONG(xdrs, longp) \ 151 (*(xdrs)->x_ops->x_getlong)(xdrs, longp) 152#define xdr_getlong(xdrs, longp) \ 153 (*(xdrs)->x_ops->x_getlong)(xdrs, longp) 154 155#define XDR_PUTLONG(xdrs, longp) \ 156 (*(xdrs)->x_ops->x_putlong)(xdrs, longp) 157#define xdr_putlong(xdrs, longp) \ 158 (*(xdrs)->x_ops->x_putlong)(xdrs, longp) 159 160static __inline int 161xdr_getint32(XDR *xdrs, int32_t *ip) 162{ 163 long l; 164 165 if (!xdr_getlong(xdrs, &l)) 166 return (FALSE); 167 *ip = (int32_t)l; 168 return (TRUE); 169} 170 171static __inline int 172xdr_putint32(XDR *xdrs, int32_t *ip) 173{ 174 long l; 175 176 l = (long)*ip; 177 return xdr_putlong(xdrs, &l); 178} 179 180#define XDR_GETINT32(xdrs, int32p) xdr_getint32(xdrs, int32p) 181#define XDR_PUTINT32(xdrs, int32p) xdr_putint32(xdrs, int32p) 182 183#define XDR_GETBYTES(xdrs, addr, len) \ 184 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len) 185#define xdr_getbytes(xdrs, addr, len) \ 186 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len) 187 188#define XDR_PUTBYTES(xdrs, addr, len) \ 189 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len) 190#define xdr_putbytes(xdrs, addr, len) \ 191 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len) 192 193#define XDR_GETPOS(xdrs) \ 194 (*(xdrs)->x_ops->x_getpostn)(xdrs) 195#define xdr_getpos(xdrs) \ 196 (*(xdrs)->x_ops->x_getpostn)(xdrs) 197 198#define XDR_SETPOS(xdrs, pos) \ 199 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos) 200#define xdr_setpos(xdrs, pos) \ 201 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos) 202 203#define XDR_INLINE(xdrs, len) \ 204 (*(xdrs)->x_ops->x_inline)(xdrs, len) 205#define xdr_inline(xdrs, len) \ 206 (*(xdrs)->x_ops->x_inline)(xdrs, len) 207 208#define XDR_DESTROY(xdrs) \ 209 if ((xdrs)->x_ops->x_destroy) \ 210 (*(xdrs)->x_ops->x_destroy)(xdrs) 211#define xdr_destroy(xdrs) \ 212 if ((xdrs)->x_ops->x_destroy) \ 213 (*(xdrs)->x_ops->x_destroy)(xdrs) 214 215#define XDR_CONTROL(xdrs, req, op) \ 216 (((xdrs)->x_ops->x_control == NULL) ? (FALSE) : \ 217 (*(xdrs)->x_ops->x_control)(xdrs, req, op)) 218#define xdr_control(xdrs, req, op) XDR_CONTROL(xdrs, req, op) 219 220/* 221 * Solaris strips the '_t' from these types -- not sure why. 222 * But, let's be compatible. 223 */ 224#define xdr_rpcvers(xdrs, versp) xdr_uint32_t(xdrs, versp) 225#define xdr_rpcprog(xdrs, progp) xdr_uint32_t(xdrs, progp) 226#define xdr_rpcproc(xdrs, procp) xdr_uint32_t(xdrs, procp) 227#define xdr_rpcprot(xdrs, protp) xdr_uint32_t(xdrs, protp) 228#define xdr_rpcport(xdrs, portp) xdr_uint32_t(xdrs, portp) 229 230/* 231 * Support struct for discriminated unions. 232 * You create an array of xdrdiscrim structures, terminated with 233 * an entry with a null procedure pointer. The xdr_union routine gets 234 * the discriminant value and then searches the array of structures 235 * for a matching value. If a match is found the associated xdr routine 236 * is called to handle that part of the union. If there is 237 * no match, then a default routine may be called. 238 * If there is no match and no default routine it is an error. 239 */ 240#define NULL_xdrproc_t ((xdrproc_t)0) 241struct xdr_discrim { 242 int value; 243 xdrproc_t proc; 244}; 245 246/* 247 * In-line routines for fast encode/decode of primitive data types. 248 * Caveat emptor: these use single memory cycles to get the 249 * data from the underlying buffer, and will fail to operate 250 * properly if the data is not aligned. The standard way to use these 251 * is to say: 252 * if ((buf = XDR_INLINE(xdrs, count)) == NULL) 253 * return (FALSE); 254 * <<< macro calls >>> 255 * where ``count'' is the number of bytes of data occupied 256 * by the primitive data types. 257 * 258 * N.B. and frozen for all time: each data type here uses 4 bytes 259 * of external representation. 260 */ 261#define IXDR_GET_INT32(buf) ((int32_t)__ntohl((uint32_t)*(buf)++)) 262#define IXDR_PUT_INT32(buf, v) (*(buf)++ =(int32_t)__htonl((uint32_t)v)) 263#define IXDR_GET_U_INT32(buf) ((uint32_t)IXDR_GET_INT32(buf)) 264#define IXDR_PUT_U_INT32(buf, v) IXDR_PUT_INT32((buf), ((int32_t)(v))) 265 266#define IXDR_GET_UINT32(buf) ((uint32_t)IXDR_GET_INT32(buf)) 267#define IXDR_PUT_UINT32(buf, v) IXDR_PUT_INT32((buf), ((int32_t)(v))) 268 269#define IXDR_GET_LONG(buf) ((long)__ntohl((uint32_t)*(buf)++)) 270#define IXDR_PUT_LONG(buf, v) (*(buf)++ =(int32_t)__htonl((uint32_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 288extern bool_t xdr_void(void); 289extern bool_t xdr_int(XDR *, int *); 290extern bool_t xdr_u_int(XDR *, u_int *); 291extern bool_t xdr_long(XDR *, long *); 292extern bool_t xdr_u_long(XDR *, u_long *); 293extern bool_t xdr_short(XDR *, short *); 294extern bool_t xdr_u_short(XDR *, u_short *); 295extern bool_t xdr_int16_t(XDR *, int16_t *); 296extern bool_t xdr_uint16_t(XDR *, uint16_t *); 297extern bool_t xdr_int32_t(XDR *, int32_t *); 298extern bool_t xdr_uint32_t(XDR *, uint32_t *); 299extern bool_t xdr_int64_t(XDR *, int64_t *); 300extern bool_t xdr_uint64_t(XDR *, uint64_t *); 301extern bool_t xdr_bool(XDR *, bool_t *); 302extern bool_t xdr_enum(XDR *, enum_t *); 303extern bool_t xdr_array(XDR *, char **, u_int *, u_int, u_int, xdrproc_t); 304extern bool_t xdr_bytes(XDR *, char **, u_int *, u_int); 305extern bool_t xdr_opaque(XDR *, char *, u_int); 306extern bool_t xdr_string(XDR *, char **, u_int); 307extern bool_t xdr_union(XDR *, enum_t *, char *, const struct xdr_discrim *, xdrproc_t); 308extern bool_t xdr_char(XDR *, char *); 309extern bool_t xdr_u_char(XDR *, u_char *); 310extern bool_t xdr_vector(XDR *, char *, u_int, u_int, xdrproc_t); 311extern bool_t xdr_float(XDR *, float *); 312extern bool_t xdr_double(XDR *, double *); 313extern bool_t xdr_quadruple(XDR *, long double *); 314extern bool_t xdr_reference(XDR *, char **, u_int, xdrproc_t); 315extern bool_t xdr_pointer(XDR *, char **, u_int, xdrproc_t); 316extern bool_t xdr_wrapstring(XDR *, char **); 317extern void xdr_free(xdrproc_t, void *); 318extern bool_t xdr_hyper(XDR *, quad_t *); 319extern bool_t xdr_u_hyper(XDR *, u_quad_t *); 320extern bool_t xdr_longlong_t(XDR *, quad_t *); 321extern bool_t xdr_u_longlong_t(XDR *, u_quad_t *); 322extern unsigned long xdr_sizeof(xdrproc_t func, void *data); 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 330struct netobj { 331 u_int n_len; 332 char *n_bytes; 333}; 334typedef struct netobj netobj; 335extern bool_t xdr_netobj(XDR *, struct netobj *); 336 337/* 338 * These are XDR control operators 339 */ 340 341#define XDR_GET_BYTES_AVAIL 1 342#define XDR_PEEK 2 343#define XDR_SKIPBYTES 3 344 345struct xdr_bytesrec { 346 bool_t xc_is_last_record; 347 size_t xc_num_avail; 348}; 349 350typedef struct xdr_bytesrec xdr_bytesrec; 351 352 353/* 354 * These are the public routines for the various implementations of 355 * xdr streams. 356 */ 357__BEGIN_DECLS 358/* XDR using memory buffers */ 359extern void xdrmem_create(XDR *, char *, u_int, enum xdr_op); 360 361/* XDR using mbufs */ 362struct mbuf; 363extern void xdrmbuf_create(XDR *, struct mbuf *, enum xdr_op); 364extern void xdrmbuf_append(XDR *, struct mbuf *); 365extern struct mbuf * xdrmbuf_getall(XDR *); 366 367/* XDR pseudo records for tcp */ 368extern void xdrrec_create(XDR *, u_int, u_int, void *, 369 int (*)(void *, void *, int), 370 int (*)(void *, void *, int)); 371 372/* make end of xdr record */ 373extern bool_t xdrrec_endofrecord(XDR *, int); 374 375/* move to beginning of next record */ 376extern bool_t xdrrec_skiprecord(XDR *); 377 378/* true if no more input */ 379extern bool_t xdrrec_eof(XDR *); 380extern u_int xdrrec_readbytes(XDR *, caddr_t, u_int); 381__END_DECLS 382 383#endif /* !_KRPC_XDR_H */ 384