lib/libc/rpc/rpcb_prot.c

   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, MERCHANTIBILITY 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  * @(#)rpcb_prot.c      1.13    94/04/24 SMI; 1.9 89/04/21 Copyr 1984 Sun Micro
  30  * $NetBSD: rpcb_prot.c,v 1.3 2000/07/14 08:40:42 fvdl Exp $
  31  * $FreeBSD: src/lib/libc/rpc/rpcb_prot.c,v 1.7 2007/11/20 01:51:20 jb Exp $
  32  */
  33 /*
  34  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  35  */
  36
  37 /*
  38  * rpcb_prot.c
  39  * XDR routines for the rpcbinder version 3.
  40  *
  41  * Copyright (C) 1984, 1988, Sun Microsystems, Inc.
  42  */
  43
  44 #include "namespace.h"
  45 #include <rpc/rpc.h>
  46 #include <rpc/types.h>
  47 #include <rpc/xdr.h>
  48 #include <rpc/rpcb_prot.h>
  49 #include "un-namespace.h"
  50
  51 bool_t
  52 xdr_rpcb(XDR *xdrs, RPCB *objp)
  53 {
  54         if (!xdr_u_int32_t(xdrs, &objp->r_prog)) {
  55                 return (FALSE);
  56         }
  57         if (!xdr_u_int32_t(xdrs, &objp->r_vers)) {
  58                 return (FALSE);
  59         }
  60         if (!xdr_string(xdrs, &objp->r_netid, (u_int)~0)) {
  61                 return (FALSE);
  62         }
  63         if (!xdr_string(xdrs, &objp->r_addr, (u_int)~0)) {
  64                 return (FALSE);
  65         }
  66         if (!xdr_string(xdrs, &objp->r_owner, (u_int)~0)) {
  67                 return (FALSE);
  68         }
  69         return (TRUE);
  70 }
  71
  72 /*
  73  * rpcblist_ptr implements a linked list.  The RPCL definition from
  74  * rpcb_prot.x is:
  75  *
  76  * struct rpcblist {
  77  *      rpcb            rpcb_map;
  78  *      struct rpcblist *rpcb_next;
  79  * };
  80  * typedef rpcblist *rpcblist_ptr;
  81  *
  82  * Recall that "pointers" in XDR are encoded as a boolean, indicating whether
  83  * there's any data behind the pointer, followed by the data (if any exists).
  84  * The boolean can be interpreted as ``more data follows me''; if FALSE then
  85  * nothing follows the boolean; if TRUE then the boolean is followed by an
  86  * actual struct rpcb, and another rpcblist_ptr (declared in RPCL as "struct
  87  * rpcblist *").
  88  *
  89  * This could be implemented via the xdr_pointer type, though this would
  90  * result in one recursive call per element in the list.  Rather than do that
  91  * we can ``unwind'' the recursion into a while loop and use xdr_reference to
  92  * serialize the rpcb elements.
  93  */
  94
  95 bool_t
  96 xdr_rpcblist_ptr(XDR *xdrs, rpcblist_ptr *rp)
  97 {
  98         /*
  99          * more_elements is pre-computed in case the direction is
 100          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
 101          * xdr_bool when the direction is XDR_DECODE.
 102          */
 103         bool_t more_elements;
 104         int freeing = (xdrs->x_op == XDR_FREE);
 105         rpcblist_ptr next;
 106         rpcblist_ptr next_copy;
 107
 108         next = NULL;
 109         for (;;) {
 110                 more_elements = (bool_t)(*rp != NULL);
 111                 if (! xdr_bool(xdrs, &more_elements)) {
 112                         return (FALSE);
 113                 }
 114                 if (! more_elements) {
 115                         return (TRUE);  /* we are done */
 116                 }
 117                 /*
 118                  * the unfortunate side effect of non-recursion is that in
 119                  * the case of freeing we must remember the next object
 120                  * before we free the current object ...
 121                  */
 122                 if (freeing && *rp)
 123                         next = (*rp)->rpcb_next;
 124                 if (! xdr_reference(xdrs, (caddr_t *)rp,
 125                     (u_int)sizeof (rpcblist), (xdrproc_t)xdr_rpcb)) {
 126                         return (FALSE);
 127                 }
 128                 if (freeing) {
 129                         next_copy = next;
 130                         rp = &next_copy;
 131                         /*
 132                          * Note that in the subsequent iteration, next_copy
 133                          * gets nulled out by the xdr_reference
 134                          * but next itself survives.
 135                          */
 136                 } else if (*rp) {
 137                         rp = &((*rp)->rpcb_next);
 138                 }
 139         }
 140         /*NOTREACHED*/
 141 }
 142
 143 /*
 144  * xdr_rpcblist() is specified to take a RPCBLIST **, but is identical in
 145  * functionality to xdr_rpcblist_ptr().
 146  */
 147 bool_t
 148 xdr_rpcblist(XDR *xdrs, RPCBLIST **rp)
 149 {
 150         bool_t  dummy;
 151
 152         dummy = xdr_rpcblist_ptr(xdrs, (rpcblist_ptr *)rp);
 153         return (dummy);
 154 }
 155
 156
 157 bool_t
 158 xdr_rpcb_entry(XDR *xdrs, rpcb_entry *objp)
 159 {
 160         if (!xdr_string(xdrs, &objp->r_maddr, (u_int)~0)) {
 161                 return (FALSE);
 162         }
 163         if (!xdr_string(xdrs, &objp->r_nc_netid, (u_int)~0)) {
 164                 return (FALSE);
 165         }
 166         if (!xdr_u_int32_t(xdrs, &objp->r_nc_semantics)) {
 167                 return (FALSE);
 168         }
 169         if (!xdr_string(xdrs, &objp->r_nc_protofmly, (u_int)~0)) {
 170                 return (FALSE);
 171         }
 172         if (!xdr_string(xdrs, &objp->r_nc_proto, (u_int)~0)) {
 173                 return (FALSE);
 174         }
 175         return (TRUE);
 176 }
 177
 178 bool_t
 179 xdr_rpcb_entry_list_ptr(XDR *xdrs, rpcb_entry_list_ptr *rp)
 180 {
 181         /*
 182          * more_elements is pre-computed in case the direction is
 183          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
 184          * xdr_bool when the direction is XDR_DECODE.
 185          */
 186         bool_t more_elements;
 187         int freeing = (xdrs->x_op == XDR_FREE);
 188         rpcb_entry_list_ptr next;
 189         rpcb_entry_list_ptr next_copy;
 190
 191         next = NULL;
 192         for (;;) {
 193                 more_elements = (bool_t)(*rp != NULL);
 194                 if (! xdr_bool(xdrs, &more_elements)) {
 195                         return (FALSE);
 196                 }
 197                 if (! more_elements) {
 198                         return (TRUE);  /* we are done */
 199                 }
 200                 /*
 201                  * the unfortunate side effect of non-recursion is that in
 202                  * the case of freeing we must remember the next object
 203                  * before we free the current object ...
 204                  */
 205                 if (freeing)
 206                         next = (*rp)->rpcb_entry_next;
 207                 if (! xdr_reference(xdrs, (caddr_t *)rp,
 208                     (u_int)sizeof (rpcb_entry_list),
 209                                     (xdrproc_t)xdr_rpcb_entry)) {
 210                         return (FALSE);
 211                 }
 212                 if (freeing && *rp) {
 213                         next_copy = next;
 214                         rp = &next_copy;
 215                         /*
 216                          * Note that in the subsequent iteration, next_copy
 217                          * gets nulled out by the xdr_reference
 218                          * but next itself survives.
 219                          */
 220                 } else if (*rp) {
 221                         rp = &((*rp)->rpcb_entry_next);
 222                 }
 223         }
 224         /*NOTREACHED*/
 225 }
 226
 227 /*
 228  * XDR remote call arguments
 229  * written for XDR_ENCODE direction only
 230  */
 231 bool_t
 232 xdr_rpcb_rmtcallargs(XDR *xdrs, struct rpcb_rmtcallargs *p)
 233 {
 234         struct r_rpcb_rmtcallargs *objp =
 235             (struct r_rpcb_rmtcallargs *)(void *)p;
 236         u_int lenposition, argposition, position;
 237         int32_t *buf;
 238
 239         buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT);
 240         if (buf == NULL) {
 241                 if (!xdr_u_int32_t(xdrs, &objp->prog)) {
 242                         return (FALSE);
 243                 }
 244                 if (!xdr_u_int32_t(xdrs, &objp->vers)) {
 245                         return (FALSE);
 246                 }
 247                 if (!xdr_u_int32_t(xdrs, &objp->proc)) {
 248                         return (FALSE);
 249                 }
 250         } else {
 251                 IXDR_PUT_U_INT32(buf, objp->prog);
 252                 IXDR_PUT_U_INT32(buf, objp->vers);
 253                 IXDR_PUT_U_INT32(buf, objp->proc);
 254         }
 255
 256         /*
 257          * All the jugglery for just getting the size of the arguments
 258          */
 259         lenposition = XDR_GETPOS(xdrs);
 260         if (! xdr_u_int(xdrs, &(objp->args.args_len))) {
 261                 return (FALSE);
 262         }
 263         argposition = XDR_GETPOS(xdrs);
 264         if (! (*objp->xdr_args)(xdrs, objp->args.args_val)) {
 265                 return (FALSE);
 266         }
 267         position = XDR_GETPOS(xdrs);
 268         objp->args.args_len = (u_int)((u_long)position - (u_long)argposition);
 269         XDR_SETPOS(xdrs, lenposition);
 270         if (! xdr_u_int(xdrs, &(objp->args.args_len))) {
 271                 return (FALSE);
 272         }
 273         XDR_SETPOS(xdrs, position);
 274         return (TRUE);
 275 }
 276
 277 /*
 278  * XDR remote call results
 279  * written for XDR_DECODE direction only
 280  */
 281 bool_t
 282 xdr_rpcb_rmtcallres(XDR *xdrs, struct rpcb_rmtcallres *p)
 283 {
 284         bool_t dummy;
 285         struct r_rpcb_rmtcallres *objp = (struct r_rpcb_rmtcallres *)(void *)p;
 286
 287         if (!xdr_string(xdrs, &objp->addr, (u_int)~0)) {
 288                 return (FALSE);
 289         }
 290         if (!xdr_u_int(xdrs, &objp->results.results_len)) {
 291                 return (FALSE);
 292         }
 293         dummy = (*(objp->xdr_res))(xdrs, objp->results.results_val);
 294         return (dummy);
 295 }
 296
 297 bool_t
 298 xdr_netbuf(XDR *xdrs, struct netbuf *objp)
 299 {
 300         bool_t dummy;
 301         void **pp;
 302
 303         if (!xdr_u_int32_t(xdrs, (u_int32_t *) &objp->maxlen)) {
 304                 return (FALSE);
 305         }
 306         pp = &objp->buf;
 307         dummy = xdr_bytes(xdrs, (char **) pp,
 308                         (u_int *)&(objp->len), objp->maxlen);
 309         return (dummy);
 310 }