author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:33:58 +0100 | |
branch | RCL_3 |
changeset 58 | 8d540f55e491 |
parent 57 | abbed5a4b42a |
child 75 | c1029e558ef5 |
permissions | -rw-r--r-- |
0
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// Copyright (c) 2004-2009 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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// res_sock.h - Resolver socket API |
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// This API defines structures and constants which are used |
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// between the TCP/IP stack and an external DNS resolver |
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// daemon. |
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// |
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|
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#ifndef __RES_SOCK_H__ |
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#define __RES_SOCK_H__ |
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/** |
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@file res_sock.h |
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The resolver socket message format |
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@internalComponent Domain Name Resolver |
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*/ |
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|
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#include <e32def.h> |
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#include <dns_qry.h> |
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|
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/** |
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* DND Socket option to specify the max sessions. |
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* |
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* The DND needs to tell the gateway code how many |
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* parallel RHostResolvers (sessions) it can handle. |
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* This is done by setting this socket option. |
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*/ |
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const TUint KSolDnd = 0x10000882; // Use DND UID value as a level. |
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const TUint KSoDndSessions = 1; // Only SetOption, and parameter is "int" (= number of sessions) |
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|
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|
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const TInt KDnsRequestType_GetByName = 0; //< Query is GetByName |
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const TInt KDnsRequestType_GetByAddress = 1;//< Query is GetByAddress |
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const TInt KDnsRequestType_TDnsQuery = 2; //< Query is special DNS query |
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const TInt KDnsRequestType_GetHostName = 3; //< Query current hostname (blocks until unique if LLMNR) |
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const TInt KDnsRequestType_SetHostName = 4; //< Set new hostname (start unique checking if LLMNR) |
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const TInt KDnsRequestType_Configure = 5; //< Interface state in stack has changed. |
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|
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class TDnsRequestBase |
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/** |
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The resolver socket message format |
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|
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The communication between the resolver gateway code in the stack and |
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the resolver implementation occurs over a datagram socket. The |
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queries and replies are passed as datagrams. Each datagram contains |
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a binary message (TDnsMessage) with three fixed 32 bit header fields |
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and a payload. |
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|
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In query the fixed fields are defined as follows: |
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@li |
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(1) the payload type (TNameRecord, TDnsQuery or THostName) |
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@li |
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(2) the "next indicator" (0 is for new query, non-zero requests next |
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answer for earlier query). |
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@li |
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(3) the network id. The value ZERO indicates unknown; in such case |
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the resolver only looks name from local host file, and if not found, |
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a KErrCompletion error is returned. This error is special, and requests |
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the Socket Server to assign a non-zero network id and repeat the query. |
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@li |
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followed by the query payload, as defined by the first header field. |
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The payload is TNameRecord, if the query was GetByName or GetByAddress. |
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TDnsQuery payload defines the query explicitly. |
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|
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Any message shorter than the required minimum length is |
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interpreted by the resolver as <b>cancel request</b>. Such message |
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will stop all currently occurring activity associated with this session, |
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and disconnect the resolver from the socket. This |
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is part of the protocol and is also used by the resolver gateway |
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code, when application cancels the request (it puts a zero length |
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message into the socket). |
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|
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In a reply message, the same header format is used, but the fields have |
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partially different interpretation: |
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@li |
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(1) the payload type (TNameRecord, TDnsQryRespBase derived object, |
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THostName). |
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The value of the field is the same as in the originating query message, |
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except for GetHostName. |
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@li |
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(2) the result code of the query (KErrNone or some error indication) |
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@li |
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(3) the network id (same as in query) |
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@li |
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followed by the response payload, as defined by the first header field. |
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The payload is returned to the client application as a reply to the query. |
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*/ |
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{ |
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public: |
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TDnsRequestBase() {} |
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TDnsRequestBase(TInt aType, TInt aNext) : iType((TUint8)aType), iNext(aNext) {} |
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inline const TInt HeaderSize() const |
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{ |
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return (TInt)sizeof(*this); |
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} |
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inline TPtrC8 Header() const |
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{ |
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return TPtrC8((TUint8 *)this, HeaderSize()); |
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} |
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|
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TUint8 iType; //< Type of the payload: TDnsQuery/TDnsQryResp or TNameRecord |
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TUint8 iScope; //< The scope level of the Address Domain Id [0..15] |
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#ifdef SYMBIAN_DNS_PUNYCODE |
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//< The MSB 4 bits are used to indicate whether the IDN support is enabled / disabled |
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#endif //SYMBIAN_DNS_PUNYCODE |
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TUint16 iSession; //< The session ID. |
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TInt iNext; //< Next indicator: 0, 1, 2, ... (query), or the result (on reply) |
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TUint32 iId; //< Address domain Id |
58 | 122 |
TInt iFlowRequestType; //< 0 for IMPLICIT; 1 for SUBCONNECTION EXPLICIT; 2 for CONNECTION EXPLICIT |
0
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}; |
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|
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// Need write access to members, and just for this, need to derive all |
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// responce classes... (yuk!) |
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// |
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class TDndRespA : public TDnsRespA |
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{ |
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public: |
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inline TDndRespA() : TDnsRespA() {} |
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inline TInetAddr& HostAddress() { return iInetAddr; } |
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}; |
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|
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class TDndRespAAAA : public TDnsRespAAAA |
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{ |
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public: |
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inline TDndRespAAAA() : TDnsRespAAAA() {} |
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inline TInetAddr& HostAddress() { return iInetAddr; } |
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}; |
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|
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class TDndRespPTR : public TDnsRespPTR |
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{ |
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public: |
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inline TDndRespPTR() : TDnsRespPTR() {} |
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inline TDes8& HostName() { return iName; } |
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}; |
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class TDndRespMX : public TDnsRespMX |
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{ |
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public: |
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inline TDndRespMX() : TDnsRespMX() {} |
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inline TDes8 &HostName() { return iHostName; } |
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}; |
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class TDndRespSRV : public TDnsRespSRV |
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{ |
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public: |
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inline TDndRespSRV() : TDnsRespSRV() {} |
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inline TDes8 &Target() { return iTarget; } |
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}; |
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|
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class TDndReply : public TDnsQryRespBase |
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{ |
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public: |
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inline TDndReply(TUint16 aRRespType, TUint16 aRRClass) : TDnsQryRespBase(aRRespType, aRRClass) {} |
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}; |
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|
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class TDndRespNAPTR : public TDnsRespNAPTR |
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{ |
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public: |
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inline TDndRespNAPTR() : TDnsRespNAPTR() {} |
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inline TDes8 &Replacement() { return iReplacement; } |
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}; |
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|
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class TDnsMessage : public TDnsRequestBase |
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{ |
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public: |
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inline TPtrC8 Payload(const TInt aSize) const |
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{ |
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const TInt N = aSize < HeaderSize() ? 0 : aSize - HeaderSize(); |
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return TPtrC8((TUint8 *)this + HeaderSize(), N); |
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} |
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inline TPtr8 Payload(const TInt aSize) |
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{ |
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const TInt N = aSize < HeaderSize() ? 0 : aSize - HeaderSize(); |
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return TPtr8((TUint8 *)this + HeaderSize(), N, N); |
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} |
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|
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private: |
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// This union is here to make the size of this |
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// class large enough for the largest of the |
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// reply or query variants. (must use TUint8 |
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// arrays, because the classes themselves cannot |
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// be used in union due to contructor problems). |
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union |
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{ |
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TUint8 iNameRecord[sizeof(TNameRecord)]; //< GetByName/GetByAddress query/reply |
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TUint8 iDnsQuery[sizeof(TDnsQuery)]; //< Special Query |
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TUint8 iDnsRespSRV[sizeof(TDnsRespSRV)]; //< SRV reply |
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TUint8 iDnsRespA[sizeof(TDnsRespA)]; //< A reply |
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TUint8 iDnsRespAAAA[sizeof(TDnsRespAAAA)]; //< AAAA reply |
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TUint8 iDnsRespPTR[sizeof(TDnsRespPTR)]; //< PTR reply |
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TUint8 iDnsRespNAPTR[sizeof(TDnsRespNAPTR)]; //< NAPTR reply |
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TUint8 iDnsRespMX[sizeof(TDnsRespMX)]; //< MX reply |
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TUint8 iHostName[sizeof(THostName)]; //< SetHostName/GetHostName |
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} iPayload; |
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public: |
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// Access to the query structures |
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// GetByName/GetByAddress query/reply |
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inline TNameRecord &NameRecord() const |
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{ return (TNameRecord &)iPayload; } |
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// Special Query |
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inline TDnsQuery &Query() const |
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{ return (TDnsQuery &)iPayload; } |
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// Set/Get HostName |
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inline THostName &HostName() const |
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{ return (THostName &)iPayload; } |
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// Access the the Reply structures |
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// Generic Response header |
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inline TDndReply &Reply() const { return (TDndReply &)iPayload; } |
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// SRV reply |
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inline TDndRespSRV &SRV() const { return (TDndRespSRV &)iPayload; } |
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// A reply |
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inline TDndRespA &A() const { return (TDndRespA &)iPayload; } |
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// AAAA reply |
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inline TDndRespAAAA &AAAA() const { return (TDndRespAAAA &)iPayload; } |
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// PTR reply |
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inline TDndRespPTR &PTR() const { return (TDndRespPTR &)iPayload; } |
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// NAPTR reply |
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inline TDndRespNAPTR &NAPTR() const { return (TDndRespNAPTR &)iPayload; } |
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// MX reply |
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inline TDndRespMX &MX() const { return (TDndRespMX &)iPayload; } |
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}; |
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typedef TPckgBuf<TDnsMessage> TDnsMessageBuf; |
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#endif |
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