1 /*

     2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 #ifndef CMDNSPROBEMANAGER_H_

    18 #define CMDNSPROBEMANAGER_H_

    19 

    20 #include <e32base.h>

    21 #include <in_sock.h>

    22 

    23 class CMDNSProbeManager : public CTimer

    24 	{	

    25 	public:

    26 

    27 	/*Conflict can happen in 2 cases , 

    28 	 * Case 1: When the Address Record (Type A) is inconsistent, i.e., same

    29 	 * host name for different Ip addresses

    30 	 * Case 2: When the Service Record (Type SRV), is conflicting, two hosts try to

    31 	 * acquire the same service name with the same service type., and same 

    32 

    33 	/*Case 1:To get Unique Host Name ; to handle Host name conflict, 

    34 	 * we need the acquired host name & IPAddress*/

    35 	static CMDNSProbeManager* NewL(RBuf& aHostName, TInetAddr aAddr);

    36 	static CMDNSProbeManager* NewLC(RBuf& aHostName, TInetAddr aAddr);

    37 

    38 	/*To get Unique Service Name; to handle service name conflict, 

    39 	 * we need acquired service name & host name*/

    40 	static CMDNSProbeManager* NewL(RBuf& aServiceName,RBuf& aHostName);

    41 	static CMDNSProbeManager* NewLC(RBuf& aServiceName,RBuf& aHostName);

    42 

    43 	~CMDNSProbeManager();

    44 

    45 	private:

    46 

    47 	void RunL();

    48 	TInt RunError(TInt aError);

    49 

    50 	private:

    51 

    52 	TBool CheckForUniqueness();

    53 

    54 	void DefensiveResponseReceived();//Get a unique name (DNS Label)

    55 

    56 	void SendProbeL(); //Probe for Unique name , Create Probe and Send 

    57 	void SendAnnouncementL();//Send out Gratitous mDNS Announcement , Create Announcement and Send

    58 	void Schedule(); //Self-Complete, To be called when moved to Probe State.

    59 

    60 	void Delay(TUint32 aDelayTime/*In Milliseconds*/); //To introduce Delay between Probes.	

    61 

    62 	CMDNSProbeManager (RBuf& aHostName, TInetAddr aAddr);

    63 	CMDNSProbeManager (RBuf& aServiceName,RBuf& aHostName);

    64 	void ConstructL();

    65 

    66 	private:

    67 

    68 	enum TProbeStates

    69 	{

    70 	EIdle,

    71 	EProbeBegin,

    72 	EProbeFirstUnicast,

    73 	EProbeSecondUnicast,

    74 	EProbeMulticast,

    75 	EProbeComplete,

    76 	EFirstAnnouncement,//First gratuitous mDNS announcement

    77 	ESecondAnnouncement//Second gratuitous mDNS announcement

    78 	};

    79 

    80 	

    81 	TInetAddr iAddr;

    82 

    83 	TProbeStates iCurrentProbeState;

    84 

    85 	//MDNSCacheInterface* iCache;

    86 	

    87 	};

    88 

    89 #endif /*CMDNSPROBEMANAGER_H_*/