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/* $OpenBSD: xdr_reference.c,v 1.12 2016/12/20 22:19:08 krw Exp $ */ |
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/* |
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* Copyright (c) 2010, Oracle America, Inc. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* * Neither the name of the "Oracle America, Inc." nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
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* xdr_reference.c, Generic XDR routines implementation. |
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* |
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* These are the "non-trivial" xdr primitives used to serialize and de-serialize |
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* "pointers". See xdr.h for more info on the interface to xdr. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <rpc/types.h> |
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#include <rpc/xdr.h> |
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/* |
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* XDR an indirect pointer |
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* xdr_reference is for recursively translating a structure that is |
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* referenced by a pointer inside the structure that is currently being |
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* translated. pp references a pointer to storage. If *pp is null |
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* the necessary storage is allocated. |
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* size is the sizeof the referneced structure. |
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* proc is the routine to handle the referenced structure. |
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*/ |
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bool_t |
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xdr_reference(XDR *xdrs, |
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caddr_t *pp, /* the pointer to work on */ |
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u_int size, /* size of the object pointed to */ |
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xdrproc_t proc) /* xdr routine to handle the object */ |
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{ |
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caddr_t loc = *pp; |
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bool_t stat; |
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if (loc == NULL) |
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switch (xdrs->x_op) { |
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case XDR_FREE: |
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return (TRUE); |
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case XDR_DECODE: |
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*pp = loc = (caddr_t) calloc(size, 1); |
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if (loc == NULL) |
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return (FALSE); |
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break; |
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default: |
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break; |
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} |
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stat = (*proc)(xdrs, loc); |
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if (xdrs->x_op == XDR_FREE) { |
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mem_free(loc, size); |
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*pp = NULL; |
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} |
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return (stat); |
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} |
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DEF_WEAK(xdr_reference); |
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/* |
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* xdr_pointer(): |
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* |
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* XDR a pointer to a possibly recursive data structure. This |
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* differs with xdr_reference in that it can serialize/deserialiaze |
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* trees correctly. |
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* |
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* What's sent is actually a union: |
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* |
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* union object_pointer switch (boolean b) { |
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* case TRUE: object_data data; |
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* case FALSE: void nothing; |
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* } |
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* |
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* > objpp: Pointer to the pointer to the object. |
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* > obj_size: size of the object. |
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* > xdr_obj: routine to XDR an object. |
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* |
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*/ |
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bool_t |
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xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) |
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{ |
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bool_t more_data; |
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more_data = (*objpp != NULL); |
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if (! xdr_bool(xdrs,&more_data)) { |
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return (FALSE); |
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} |
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if (! more_data) { |
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*objpp = NULL; |
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return (TRUE); |
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} |
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return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); |
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} |
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DEF_WEAK(xdr_pointer); |