Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurityd / lib / sec_xdr_reference.c

diff --git a/Security/libsecurityd/lib/sec_xdr_reference.c b/Security/libsecurityd/lib/sec_xdr_reference.c
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+/*
+ * Copyright (c) 2006,2011,2013-2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*      $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */
+
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ *
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ *
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California  94043
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint) 
+static char *sccsid = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
+static char *sccsid = "@(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";
+static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.11 2002/03/22 21:53:26 obrien Exp $";
+#endif
+#include <sys/cdefs.h>
+#include <assert.h>
+/*
+ * xdr_reference.c, Generic XDR routines impelmentation.
+ *
+ * Copyright (C) 1987, Sun Microsystems, Inc.
+ *
+ * These are the "non-trivial" xdr primitives used to serialize and de-serialize
+ * "pointers".  See xdr.h for more info on the interface to xdr.
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sec_xdr.h"
+
+/*
+ * XDR an indirect pointer
+ * xdr_reference is for recursively translating a structure that is
+ * referenced by a pointer inside the structure that is currently being
+ * translated.  pp references a pointer to storage. If *pp is null
+ * the  necessary storage is allocated.
+ * size is the sizeof the referneced structure.
+ * proc is the routine to handle the referenced structure.
+ */
+bool_t
+sec_xdr_reference(XDR *xdrs, uint8_t **pp, u_int size, xdrproc_t proc)
+{
+    uint8_t *loc = pp ? *pp : NULL;
+    bool_t stat;
+
+    if (size > 1024) {
+        // Structure suspiciously large: 1024 is arbitrary upper bound
+        // for struct sizes (non-nested size)
+        assert(FALSE);
+        return (FALSE);
+    }
+    uint8_t obj[size];
+
+    bool_t sizeof_alloc = sec_xdr_arena_size_allocator(xdrs);
+
+    if (loc == NULL)
+            switch (xdrs->x_op) {
+            case XDR_FREE:
+                return (TRUE);
+            case XDR_DECODE:
+                {
+                    if (!sec_mem_alloc(xdrs, size, &loc))
+                        return (FALSE);
+                                       if (!loc) {
+                        memset(obj, 0, size);
+                                               loc = &obj[0];
+                    }
+                                       if (!sizeof_alloc)
+                                               *pp = loc;
+                                       break;
+                }
+            case XDR_ENCODE:
+                break;
+            }
+
+    stat = (*proc)(xdrs, loc, 0);
+
+    if (xdrs->x_op == XDR_FREE) {
+        sec_mem_free(xdrs, loc, size);
+        *pp = NULL;
+    }
+    return (stat);
+}
+
+
+bool_t
+sec_xdr_pointer(XDR *xdrs, uint8_t **objpp, u_int obj_size, xdrproc_t xdr_obj)
+{
+    bool_t more_data;
+
+    more_data = (objpp ? (*objpp != NULL) : FALSE);
+    if (! xdr_bool(xdrs,&more_data))
+        return (FALSE);
+
+    bool_t sizeof_alloc = sec_xdr_arena_size_allocator(xdrs);
+
+    if (! more_data) {
+        if ((xdrs->x_op == XDR_DECODE) && !sizeof_alloc)
+            *objpp = NULL;
+        return (TRUE);
+    }
+    return (sec_xdr_reference(xdrs,objpp,obj_size,xdr_obj));
+}
+
+/**
+ * This is almost a straight copy of the standard implementation, except
+ * that all calls made that allocate memory can defer to an alternate 
+ * mechanism, with the purpose to allocate from one block of memory on
+ * *decode*
+ */