author | William Roberts <williamr@symbian.org> |
Wed, 10 Nov 2010 13:36:07 +0000 | |
branch | RCL_3 |
changeset 79 | 4b172931a477 |
parent 0 | af10295192d8 |
permissions | -rw-r--r-- |
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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// llmnrconflict.h - Interface definitions LLMNR name conflict notification |
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// Interface definitions for the LLMNR name conflict notification |
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// |
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/** |
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@file llmnrconflict.h |
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@publishedPartner |
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@released |
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*/ |
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#ifndef __LLMNRCONFLICT_H__ |
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#define __LLMNRCONFLICT_H__ |
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#include <es_sock.h> |
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/** |
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* The notification UID |
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*/ |
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TInt KLlmnrConflictNotifyUid = 0x101F6D23; |
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class TLlmnrConflictName |
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{ |
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public: |
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inline TBool IsSafe() const; |
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THostName iName; //< The host name. |
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}; |
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class TLlmnrConflictNotify : public TLlmnrConflictName |
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/** |
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* Conflict notification message format. |
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* |
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* The base iName contains the link local name which is conflict |
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* with some other host on some interface assotiated with the |
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* indicated IAP (iIAPId). |
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*/ |
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{ |
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public: |
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TUint32 iIAPId; //< ID of selected IAP |
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TUint32 iNetworkId; //< ID of Network to which IAP belongs |
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}; |
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/** |
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* The reply from notifier only has the replacement host name. |
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* |
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* The the nofitier completes with KErrNone, the reply message can contain |
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* a the new name. If this new name is also colliding with someone, another |
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* notify is issued. |
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* |
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* If the notifier does not want LLMNR to try an alternate name, it should |
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* either complete with some error (KErrCancel for example), or KErrNone |
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* with empty replacement name (iName.Length() == 0). |
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*/ |
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typedef TLlmnrConflictName TLlmnrConflictReply; |
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TBool TLlmnrConflictName::IsSafe() const |
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/** |
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* Test if iName really is a TBuf derived descriptor. |
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*/ |
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{ |
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// This test is defined, because this structure is passed as a parameter, |
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// and any sender of the message can crash the receiver by placing tailored "garbage" |
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// on TBuf descriptor. The receiver has no official way of validating that TBuf |
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// descriptor is correct, and the garbage can be such that any reference to the |
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// content of TBuf will cause panic (for example place into iTypeLength field a |
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// value that implies TPtr and NULL into actual buffer address). |
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// |
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// This method gives some (but not 100%) confidence that accessing the iName |
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// does not cause a panic. This test works on assumtion that first TInt of |
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// the descriptor holds "type length" information, and that type of a TBuf is |
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// 0. |
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// |
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// Something like this sbould be provided by the descriptor class itself! |
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// |
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return ((iName.Length() | 0x30000000) == (TInt &)iName && // ... is really a TBuf? |
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iName.Length() <= iName.MaxLength() && // ... length & maxlength seem reasonable |
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iName.MaxSize() >= (sizeof(THostName) - 2*sizeof(TInt))); |
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} |
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#endif |