+++ /dev/null
-/*
- * Copyright (c) 2003-2004 Apple Computer, 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@
- */
-
-
-//
-// transwalkers - server side transition data walking support
-//
-// These are data walker operators for securely marshaling and unmarshaling
-// data structures across IPC. They are also in charge of fixing byte order
-// inconsistencies between server and clients.
-//
-#include <transwalkers.h>
-
-
-using LowLevelMemoryUtilities::increment;
-using LowLevelMemoryUtilities::difference;
-
-
-bool flipClient()
-{
- return Server::process().byteFlipped();
-}
-
-
-//
-// CheckingRelocateWalkers
-//
-CheckingReconstituteWalker::CheckingReconstituteWalker(void *ptr, void *base, size_t size, bool flip)
- : mBase(base), mFlip(flip)
-{
- if (mFlip)
- Flippers::flip(mBase); // came in reversed; fix for base use
- mOffset = difference(ptr, mBase);
- mLimit = increment(mBase, size);
-}
-
-
-//
-// Relocation support
-//
-void relocate(Context &context, void *base, Context::Attr *attrs, uint32 attrSize)
-{
- flip(context);
- CheckingReconstituteWalker relocator(attrs, base, attrSize, flipClient());
- context.ContextAttributes = attrs; // fix context->attr vector link
- for (uint32 n = 0; n < context.attributesInUse(); n++)
- walk(relocator, context[n]);
-}
-
-
-//
-// Outbound flipping support
-//
-FlipWalker::~FlipWalker()
-{
- for (set<Flipper>::const_iterator it = mFlips.begin(); it != mFlips.end(); it++)
- delete it->impl;
-}
-
-void FlipWalker::doFlips(bool active)
-{
- if (active) {
- secdebug("flipwalkers", "starting outbound flips");
- for (set<Flipper>::const_iterator it = mFlips.begin(); it != mFlips.end(); it++)
- it->impl->flip();
- secdebug("flipwalkers", "outbound flips done");
- }
-}
-
-
-//
-// Choose a Database from a choice of two sources, giving preference
-// to persistent stores and to earlier sources.
-//
-Database *pickDb(Database *db1, Database *db2)
-{
- // persistent db1 always wins
- if (db1 && !db1->transient())
- return db1;
-
- // persistent db2 is next choice
- if (db2 && !db2->transient())
- return db2;
-
- // pick any existing transient database
- if (db1)
- return db1;
- if (db2)
- return db2;
-
- // none at all. use the canonical transient store
- return Server::optionalDatabase(noDb);
-}
-
-
-
-void fixDbAttributes (CssmDbAttributeData &data)
-{
- /*
- NOTE TO FUTURE MAINTAINERS OF THIS CODE:
-
- This code is called by two different routines; the relocation walker on the input attributes, and flips
- on the output attributtes. This is bad, because the relocation walker flips the Info data structure,
- and flips does not. We could fix this in flips, but flips is a template and does different things
- depending on what its parameters are. As a result, the best place to do this is here.
- */
-
- // pull this data out first, so that it is unperverted once the flip occurs
- unsigned limit = data.size ();
- unsigned format = data.format ();
- CssmData* values = data.values ();
-
- // flip if it is safe to do so
- if (format > CSSM_DB_ATTRIBUTE_FORMAT_COMPLEX) // is the format screwed up?
- {
- flip (data.info ());
- limit = data.size ();
- format = data.format ();
- values = data.values ();
- }
-
- unsigned i;
-
- for (i = 0; i < limit; ++i)
- {
- switch (format)
- {
- case CSSM_DB_ATTRIBUTE_FORMAT_UINT32:
- Flippers::flip(*(uint32*) values[i].data ());
- break;
-
- case CSSM_DB_ATTRIBUTE_FORMAT_MULTI_UINT32:
- {
- CssmData& d = values[i];
- int numValues = d.length() / sizeof (UInt32);
- int j;
- UInt32* v = (UInt32*) d.data();
- for (j = 0; j < numValues; ++j)
- {
- Flippers::flip (v[j]);
- }
- }
- break;
- }
- }
-}
-
-
-
-void fixDbAttributes (CssmQuery &query)
-{
- unsigned i;
- unsigned numItems = query.size ();
- for (i = 0; i < numItems; ++i)
- {
- fixDbAttributes(query.predicates()[i].attribute());
- }
-}
-
-
-
-void fixDbAttributes (CssmDbRecordAttributeData &data)
-{
- unsigned i;
- unsigned numItems = data.size ();
- for (i = 0; i < numItems; ++i)
- {
- fixDbAttributes(data.attributes()[i]);
- }
-}
projects / apple / securityd.git / blobdiff