usr/src/lib/libc/port/nsl/rpcb_prot.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27
  28 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  29 /* All Rights Reserved */
  30 /*
  31  * Portions of this source code were derived from Berkeley
  32  * 4.3 BSD under license from the Regents of the University of
  33  * California.
  34  */
  35
  36 /*
  37  * XDR routines for the rpcbinder version 3.
  38  */
  39
  40 #include "mt.h"
  41 #include <rpc/rpc.h>
  42 #include <rpc/types.h>
  43 #include <rpc/xdr.h>
  44 #include <rpc/rpcb_prot.h>
  45
  46
  47 bool_t
  48 xdr_rpcb(XDR *xdrs, RPCB *objp)
  49 {
  50         if (!xdr_u_int(xdrs, (uint_t *)&objp->r_prog))
  51                 return (FALSE);
  52         if (!xdr_u_int(xdrs, (uint_t *)&objp->r_vers))
  53                 return (FALSE);
  54         if (!xdr_string(xdrs, &objp->r_netid, ~0))
  55                 return (FALSE);
  56         if (!xdr_string(xdrs, &objp->r_addr, ~0))
  57                 return (FALSE);
  58         return (xdr_string(xdrs, &objp->r_owner, ~0));
  59 }
  60
  61 /*
  62  * rpcblist_ptr implements a linked list.  The RPCL definition from
  63  * rpcb_prot.x is:
  64  *
  65  * struct rpcblist {
  66  *      rpcb            rpcb_map;
  67  *      struct rpcblist *rpcb_next;
  68  * };
  69  * typedef rpcblist *rpcblist_ptr;
  70  *
  71  * Recall that "pointers" in XDR are encoded as a boolean, indicating whether
  72  * there's any data behind the pointer, followed by the data (if any exists).
  73  * The boolean can be interpreted as ``more data follows me''; if FALSE then
  74  * nothing follows the boolean; if TRUE then the boolean is followed by an
  75  * actual struct rpcb, and another rpcblist_ptr (declared in RPCL as "struct
  76  * rpcblist *").
  77  *
  78  * This could be implemented via the xdr_pointer type, though this would
  79  * result in one recursive call per element in the list.  Rather than do that
  80  * we can ``unwind'' the recursion into a while loop and use xdr_reference to
  81  * serialize the rpcb elements.
  82  */
  83
  84 bool_t
  85 xdr_rpcblist_ptr(XDR *xdrs, rpcblist_ptr *rp)
  86 {
  87         /*
  88          * more_elements is pre-computed in case the direction is
  89          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
  90          * xdr_bool when the direction is XDR_DECODE.
  91          */
  92         bool_t more_elements;
  93         int freeing = (xdrs->x_op == XDR_FREE);
  94         rpcblist_ptr next;
  95         rpcblist_ptr next_copy;
  96
  97         for (;;) {
  98                 more_elements = (bool_t)(*rp != NULL);
  99                 if (!xdr_bool(xdrs, &more_elements))
 100                         return (FALSE);
 101                 if (!more_elements)
 102                         return (TRUE);  /* we are done */
 103                 /*
 104                  * the unfortunate side effect of non-recursion is that in
 105                  * the case of freeing we must remember the next object
 106                  * before we free the current object ...
 107                  */
 108                 if (freeing)
 109                         next = (*rp)->rpcb_next;
 110                 if (!xdr_reference(xdrs, (caddr_t *)rp,
 111                     (uint_t)sizeof (rpcblist), (xdrproc_t)xdr_rpcb))
 112                         return (FALSE);
 113                 if (freeing) {
 114                         next_copy = next;
 115                         rp = &next_copy;
 116                         /*
 117                          * Note that in the subsequent iteration, next_copy
 118                          * gets nulled out by the xdr_reference
 119                          * but next itself survives.
 120                          */
 121                 } else {
 122                         rp = &((*rp)->rpcb_next);
 123                 }
 124         }
 125         /*NOTREACHED*/
 126 }
 127
 128 /*
 129  * xdr_rpcblist() is specified to take a RPCBLIST **, but is identical in
 130  * functionality to xdr_rpcblist_ptr().
 131  */
 132 bool_t
 133 xdr_rpcblist(XDR *xdrs, RPCBLIST **rp)
 134 {
 135         return (xdr_rpcblist_ptr(xdrs, (rpcblist_ptr *)rp));
 136 }
 137
 138
 139 bool_t
 140 xdr_rpcb_entry(XDR *xdrs, rpcb_entry *objp)
 141 {
 142         if (!xdr_string(xdrs, &objp->r_maddr, ~0))
 143                 return (FALSE);
 144         if (!xdr_string(xdrs, &objp->r_nc_netid, ~0))
 145                 return (FALSE);
 146         if (!xdr_u_int(xdrs, &objp->r_nc_semantics))
 147                 return (FALSE);
 148         if (!xdr_string(xdrs, &objp->r_nc_protofmly, ~0))
 149                 return (FALSE);
 150         return (xdr_string(xdrs, &objp->r_nc_proto, ~0));
 151 }
 152
 153 bool_t
 154 xdr_rpcb_entry_list_ptr(XDR *xdrs, rpcb_entry_list_ptr *rp)
 155 {
 156         /*
 157          * more_elements is pre-computed in case the direction is
 158          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
 159          * xdr_bool when the direction is XDR_DECODE.
 160          */
 161         bool_t more_elements;
 162         int freeing = (xdrs->x_op == XDR_FREE);
 163         rpcb_entry_list_ptr next;
 164         rpcb_entry_list_ptr next_copy;
 165
 166         for (;;) {
 167                 more_elements = (bool_t)(*rp != NULL);
 168                 if (!xdr_bool(xdrs, &more_elements))
 169                         return (FALSE);
 170                 if (!more_elements)
 171                         return (TRUE);  /* we are done */
 172                 /*
 173                  * the unfortunate side effect of non-recursion is that in
 174                  * the case of freeing we must remember the next object
 175                  * before we free the current object ...
 176                  */
 177                 if (freeing)
 178                         next = (*rp)->rpcb_entry_next;
 179                 if (!xdr_reference(xdrs, (caddr_t *)rp,
 180                     (uint_t)sizeof (rpcb_entry_list),
 181                     (xdrproc_t)xdr_rpcb_entry))
 182                         return (FALSE);
 183                 if (freeing) {
 184                         next_copy = next;
 185                         rp = &next_copy;
 186                         /*
 187                          * Note that in the subsequent iteration, next_copy
 188                          * gets nulled out by the xdr_reference
 189                          * but next itself survives.
 190                          */
 191                 } else {
 192                         rp = &((*rp)->rpcb_entry_next);
 193                 }
 194         }
 195         /*NOTREACHED*/
 196 }
 197
 198 /*
 199  * XDR remote call arguments
 200  * written for XDR_ENCODE direction only
 201  */
 202 bool_t
 203 xdr_rpcb_rmtcallargs(XDR *xdrs, struct r_rpcb_rmtcallargs *objp)
 204 {
 205         uint_t lenposition, argposition, position;
 206         rpc_inline_t *buf;
 207
 208         buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT);
 209         if (buf == NULL) {
 210                 if (!xdr_u_int(xdrs, (uint_t *)&objp->prog))
 211                         return (FALSE);
 212                 if (!xdr_u_int(xdrs, (uint_t *)&objp->vers))
 213                         return (FALSE);
 214                 if (!xdr_u_int(xdrs, (uint_t *)&objp->proc))
 215                         return (FALSE);
 216         } else {
 217                 IXDR_PUT_U_INT32(buf, objp->prog);
 218                 IXDR_PUT_U_INT32(buf, objp->vers);
 219                 IXDR_PUT_U_INT32(buf, objp->proc);
 220         }
 221
 222         /*
 223          * All the jugglery for just getting the size of the arguments
 224          */
 225         lenposition = XDR_GETPOS(xdrs);
 226         if (!xdr_u_int(xdrs, &(objp->args.args_len)))
 227                 return (FALSE);
 228         argposition = XDR_GETPOS(xdrs);
 229         if (!(*objp->xdr_args)(xdrs, objp->args.args_val))
 230                 return (FALSE);
 231         position = XDR_GETPOS(xdrs);
 232         objp->args.args_len = (uint_t)position - (uint_t)argposition;
 233         XDR_SETPOS(xdrs, lenposition);
 234         if (!xdr_u_int(xdrs, &(objp->args.args_len)))
 235                 return (FALSE);
 236         XDR_SETPOS(xdrs, position);
 237         return (TRUE);
 238 }
 239
 240 /*
 241  * XDR remote call results
 242  * written for XDR_DECODE direction only
 243  */
 244 bool_t
 245 xdr_rpcb_rmtcallres(XDR *xdrs, struct r_rpcb_rmtcallres *objp)
 246 {
 247         if (!xdr_string(xdrs, &objp->addr, ~0))
 248                 return (FALSE);
 249         if (!xdr_u_int(xdrs, &objp->results.results_len))
 250                 return (FALSE);
 251         return ((*(objp->xdr_res))(xdrs, objp->results.results_val));
 252 }
 253
 254 bool_t
 255 xdr_netbuf(XDR *xdrs, struct netbuf *objp)
 256 {
 257         bool_t res;
 258
 259         /*
 260          * Save the passed in maxlen value and buf pointer.  We might
 261          * need them later.
 262          */
 263         uint_t maxlen_save = objp->maxlen;
 264         void *buf_save = objp->buf;
 265
 266         if (!xdr_u_int(xdrs, &objp->maxlen))
 267                 return (FALSE);
 268
 269         /*
 270          * We need to free maxlen, not len, so do it explicitly now.
 271          */
 272         if (xdrs->x_op == XDR_FREE)
 273                 return (xdr_bytes(xdrs, &objp->buf, &objp->maxlen,
 274                     objp->maxlen));
 275
 276         /*
 277          * If we're decoding and the caller has already allocated a
 278          * buffer restore the maxlen value since the decoded value
 279          * doesn't apply to the caller's buffer.  xdr_bytes() will
 280          * return an error if the buffer isn't big enough.
 281          */
 282         if (xdrs->x_op == XDR_DECODE && objp->buf != NULL)
 283                 objp->maxlen = maxlen_save;
 284
 285         res = xdr_bytes(xdrs, &objp->buf, &objp->len, objp->maxlen);
 286
 287         /*
 288          * If we are decoding and the buffer was allocated in the
 289          * xdr_bytes() function we need to set maxlen properly to
 290          * follow the netbuf semantics.
 291          */
 292         if (xdrs->x_op == XDR_DECODE && objp->buf != buf_save)
 293                 objp->maxlen = objp->len;
 294
 295         return (res);
 296 }