The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpcb_prot.c

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    1 /*      $NetBSD: rpcb_prot.c,v 1.3 2000/07/14 08:40:42 fvdl 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  * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
   34  */
   35 
   36 /* #ident       "@(#)rpcb_prot.c        1.13    94/04/24 SMI" */
   37 
   38 #if defined(LIBC_SCCS) && !defined(lint)
   39 static char sccsid[] = "@(#)rpcb_prot.c 1.9 89/04/21 Copyr 1984 Sun Micro";
   40 #endif
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: releng/12.0/sys/rpc/rpcb_prot.c 326023 2017-11-20 19:43:44Z pfg $");
   43 
   44 /*
   45  * rpcb_prot.c
   46  * XDR routines for the rpcbinder version 3.
   47  *
   48  * Copyright (C) 1984, 1988, Sun Microsystems, Inc.
   49  */
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/kernel.h>
   54 #include <sys/malloc.h>
   55 
   56 #include <rpc/rpc.h>
   57 #include <rpc/rpc_com.h>
   58 #include <rpc/rpcb_prot.h>
   59 
   60 bool_t
   61 xdr_portmap(XDR *xdrs, struct portmap *regs)
   62 {
   63 
   64         if (xdr_u_long(xdrs, &regs->pm_prog) &&
   65                 xdr_u_long(xdrs, &regs->pm_vers) &&
   66                 xdr_u_long(xdrs, &regs->pm_prot))
   67                 return (xdr_u_long(xdrs, &regs->pm_port));
   68         return (FALSE);
   69 }
   70 
   71 bool_t
   72 xdr_rpcb(XDR *xdrs, RPCB *objp)
   73 {
   74         if (!xdr_uint32_t(xdrs, &objp->r_prog)) {
   75                 return (FALSE);
   76         }
   77         if (!xdr_uint32_t(xdrs, &objp->r_vers)) {
   78                 return (FALSE);
   79         }
   80         if (!xdr_string(xdrs, &objp->r_netid, RPC_MAXDATASIZE)) {
   81                 return (FALSE);
   82         }
   83         if (!xdr_string(xdrs, &objp->r_addr, RPC_MAXDATASIZE)) {
   84                 return (FALSE);
   85         }
   86         if (!xdr_string(xdrs, &objp->r_owner, RPC_MAXDATASIZE)) {
   87                 return (FALSE);
   88         }
   89         return (TRUE);
   90 }
   91 
   92 /*
   93  * rpcblist_ptr implements a linked list.  The RPCL definition from
   94  * rpcb_prot.x is:
   95  *
   96  * struct rpcblist {
   97  *      rpcb            rpcb_map;
   98  *      struct rpcblist *rpcb_next;
   99  * };
  100  * typedef rpcblist *rpcblist_ptr;
  101  *
  102  * Recall that "pointers" in XDR are encoded as a boolean, indicating whether
  103  * there's any data behind the pointer, followed by the data (if any exists).
  104  * The boolean can be interpreted as ``more data follows me''; if FALSE then
  105  * nothing follows the boolean; if TRUE then the boolean is followed by an
  106  * actual struct rpcb, and another rpcblist_ptr (declared in RPCL as "struct
  107  * rpcblist *").
  108  *
  109  * This could be implemented via the xdr_pointer type, though this would
  110  * result in one recursive call per element in the list.  Rather than do that
  111  * we can ``unwind'' the recursion into a while loop and use xdr_reference to
  112  * serialize the rpcb elements.
  113  */
  114 
  115 bool_t
  116 xdr_rpcblist_ptr(XDR *xdrs, rpcblist_ptr *rp)
  117 {
  118         /*
  119          * more_elements is pre-computed in case the direction is
  120          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
  121          * xdr_bool when the direction is XDR_DECODE.
  122          */
  123         bool_t more_elements;
  124         int freeing = (xdrs->x_op == XDR_FREE);
  125         rpcblist_ptr next;
  126         rpcblist_ptr next_copy;
  127 
  128         next = NULL;
  129         for (;;) {
  130                 more_elements = (bool_t)(*rp != NULL);
  131                 if (! xdr_bool(xdrs, &more_elements)) {
  132                         return (FALSE);
  133                 }
  134                 if (! more_elements) {
  135                         return (TRUE);  /* we are done */
  136                 }
  137                 /*
  138                  * the unfortunate side effect of non-recursion is that in
  139                  * the case of freeing we must remember the next object
  140                  * before we free the current object ...
  141                  */
  142                 if (freeing && *rp)
  143                         next = (*rp)->rpcb_next;
  144                 if (! xdr_reference(xdrs, (caddr_t *)rp,
  145                     (u_int)sizeof (RPCBLIST), (xdrproc_t)xdr_rpcb)) {
  146                         return (FALSE);
  147                 }
  148                 if (freeing) {
  149                         next_copy = next;
  150                         rp = &next_copy;
  151                         /*
  152                          * Note that in the subsequent iteration, next_copy
  153                          * gets nulled out by the xdr_reference
  154                          * but next itself survives.
  155                          */
  156                 } else if (*rp) {
  157                         rp = &((*rp)->rpcb_next);
  158                 }
  159         }
  160         /*NOTREACHED*/
  161 }
  162 
  163 #if 0
  164 /*
  165  * xdr_rpcblist() is specified to take a RPCBLIST **, but is identical in
  166  * functionality to xdr_rpcblist_ptr().
  167  */
  168 bool_t
  169 xdr_rpcblist(XDR *xdrs, RPCBLIST **rp)
  170 {
  171         bool_t  dummy;
  172 
  173         dummy = xdr_rpcblist_ptr(xdrs, (rpcblist_ptr *)rp);
  174         return (dummy);
  175 }
  176 #endif
  177 
  178 bool_t
  179 xdr_rpcb_entry(XDR *xdrs, rpcb_entry *objp)
  180 {
  181         if (!xdr_string(xdrs, &objp->r_maddr, RPC_MAXDATASIZE)) {
  182                 return (FALSE);
  183         }
  184         if (!xdr_string(xdrs, &objp->r_nc_netid, RPC_MAXDATASIZE)) {
  185                 return (FALSE);
  186         }
  187         if (!xdr_uint32_t(xdrs, &objp->r_nc_semantics)) {
  188                 return (FALSE);
  189         }
  190         if (!xdr_string(xdrs, &objp->r_nc_protofmly, RPC_MAXDATASIZE)) {
  191                 return (FALSE);
  192         }
  193         if (!xdr_string(xdrs, &objp->r_nc_proto, RPC_MAXDATASIZE)) {
  194                 return (FALSE);
  195         }
  196         return (TRUE);
  197 }
  198 
  199 bool_t
  200 xdr_rpcb_entry_list_ptr(XDR *xdrs, rpcb_entry_list_ptr *rp)
  201 {
  202         /*
  203          * more_elements is pre-computed in case the direction is
  204          * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
  205          * xdr_bool when the direction is XDR_DECODE.
  206          */
  207         bool_t more_elements;
  208         int freeing = (xdrs->x_op == XDR_FREE);
  209         rpcb_entry_list_ptr next;
  210         rpcb_entry_list_ptr next_copy;
  211 
  212         next = NULL;
  213         for (;;) {
  214                 more_elements = (bool_t)(*rp != NULL);
  215                 if (! xdr_bool(xdrs, &more_elements)) {
  216                         return (FALSE);
  217                 }
  218                 if (! more_elements) {
  219                         return (TRUE);  /* we are done */
  220                 }
  221                 /*
  222                  * the unfortunate side effect of non-recursion is that in
  223                  * the case of freeing we must remember the next object
  224                  * before we free the current object ...
  225                  */
  226                 if (freeing)
  227                         next = (*rp)->rpcb_entry_next;
  228                 if (! xdr_reference(xdrs, (caddr_t *)rp,
  229                     (u_int)sizeof (rpcb_entry_list),
  230                                     (xdrproc_t)xdr_rpcb_entry)) {
  231                         return (FALSE);
  232                 }
  233                 if (freeing && *rp) {
  234                         next_copy = next;
  235                         rp = &next_copy;
  236                         /*
  237                          * Note that in the subsequent iteration, next_copy
  238                          * gets nulled out by the xdr_reference
  239                          * but next itself survives.
  240                          */
  241                 } else if (*rp) {
  242                         rp = &((*rp)->rpcb_entry_next);
  243                 }
  244         }
  245         /*NOTREACHED*/
  246 }

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