tcpiputils/dnd/src/engine.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 31 Aug 2010 16:45:15 +0300
branchRCL_3
changeset 21 abbed5a4b42a
parent 20 7e41d162e158
child 22 8d540f55e491
permissions -rw-r--r--
Revision: 201035 Kit: 201035
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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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// engine.cpp - name resolver core engine
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//
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#include "dnd.hrh"
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#include "engine.h"
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#include "listener.h"
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#include "dnd_ini.h"
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#include "inet6log.h"
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#include <es_ini.h>
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#include <timeout.h>
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#include "in6_version.h"
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//
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MDemonEngine *MDemonEngine::NewL(MDemonMain &aMain)
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	/**
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	* Create the instance of CDndEngine.
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	* There can only be one of these.
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	* @param aMain The DLL/EXE "main" interface
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	* @return The Engine interface
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	*/
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	{
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	return new (ELeave) CDndEngine(aMain);
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	}
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//
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CDndEngine::~CDndEngine()
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	{
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	//
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	// Ordering is important... Do not close iSS before
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	// all sockets associated with it have been closed!
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	//
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	iHostsFile.Close();
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	delete iListener;
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	delete iConfig;
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	delete iTimer;
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	iSocket.Close();
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	iFS.Close();
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	iSS.Close();
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	}
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TInt CDndEngine::GetIniValue(const TDesC &aSection, const TDesC &aName, TInt aDefault, TInt aMin, TInt aMax)
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	/**
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	* Read an integer value from the INI file.
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	*
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	* The INI is a text file (currently named by #DND_INI_DATA).
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	* The used sections are [resolver] and [llmnr]
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	*
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	* @param aSection The INI section name
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	* @param aName The INI variable name
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	* @param aDefault The value returned if variable name not found or is out of range
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	* @param aMin The min of the accepted range
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	* @param aMax The max of the accepted range
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	*/
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	{
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	LOG(_LIT(KFormat, "\t[%S] %S = %d"));
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	LOG(_LIT(KFormatInv, "\t[%S] %S = %d is invalid"));
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	TInt value;
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	if (!FindVar(aSection, aName, value))
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		value = aDefault;
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	else if (value < aMin || value > aMax)
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		{
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		LOG(Log::Printf(KFormatInv, &aSection, &aName, value));
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		value = aDefault;
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		}
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	LOG(Log::Printf(KFormat, &aSection, &aName, value));
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	return value;
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	}
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void CDndEngine::GetIniAddress(const TDesC &aSection, const TDesC &aName, const TDesC &aDefault, TIp6Addr &aAddr)
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	/**
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	* Read an address value from the INI file.
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	*
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	* The INI is a text file (currently named by #DND_INI_DATA).
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	* The currently used sections are [resolver] and [llmnr].
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	*
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	* The default is used if INI file does not specify address or the specified
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	* address is not syntactically correct. If the default is also bad, the
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	* aAddr will be unspecified.
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	*
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	* @param aSection The INI section name
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	* @param aName The INI variable name
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	* @param aDefault The default value for the variable (string format)
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	* @retval aAddr The address
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	*/
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	{
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	TInetAddr addr;
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	TPtrC str;
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	if (!FindVar(aSection, aName, str))
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		str.Set(aDefault);
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	const TInt value = addr.Input(str);
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	// If the parameter is bad, then use the aDefault, but show the
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	// parameter value and result. (If aDefault is bad, Input is done
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	// twice to it, both fail and address will be unspecified.)
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	if (value != KErrNone)
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		(void)addr.Input(aDefault);
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parents:
diff changeset
   115
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   116
	if (addr.Family() != KAfInet6)
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   117
		addr.ConvertToV4Mapped();
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   118
	aAddr = addr.Ip6Address();
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   119
	LOG(_LIT(KFormatAddr, "\t[%S] %S = %S [err=%d]"));
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   120
	LOG(Log::Printf(KFormatAddr, &aSection, &aName, &str, value));
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   121
	}
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parents:
diff changeset
   122
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   123
void CDndEngine::ConstructL()
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	/**
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   125
	* Construct the engine.
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parents:
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   126
	*
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   127
	* Open file and socket server sessions, read configuration parameters
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   128
	* from [resolver] and [lmnr] sections, create the timeout
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	* manager (MTimeoutManager) and listener (CDndListener) instances.
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   130
	*/
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   131
	{
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   132
	LOG(Log::Printf(_L("--- DND starting, version: [%S] ---"), &KInet6Version));
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   133
	//
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   134
	// Start Socket Reader activity
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   135
	//
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   136
	CheckResultL(_L("Active Scheduler"), CActiveScheduler::Current() == NULL);
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   137
	CheckResultL(_L("Connect to File server"), iFS.Connect());
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   138
	CheckResultL(_L("Connect to Socket server"), iSS.Connect());
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   139
	CheckResultL(_L("Opening socket for Get/SetOpt"), iSocket.Open(iSS,  KAfInet, KSockDatagram, KProtocolInetUdp));
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   140
	// The utility socket should be pretty much "invisible", so disable some things...
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   141
	(void)iSocket.SetOpt(KSoUserSocket, KSolInetIp, 0);
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   142
	(void)iSocket.SetOpt(KSoKeepInterfaceUp, KSolInetIp, 0);
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   143
	// Failing to open hosts file is not a fatal error.
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   144
	(void)CheckResult(_L("Opening hosts file"), iHostsFile.Open());
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   145
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   146
	//
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   147
	// Setup Configuration Parameters
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   148
	//
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   149
	iParams.iRetries = GetIniValue(DND_INI_RESOLVER, DND_INI_RETRIES, KDndIni_Retries, 1, 255);
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   150
	iParams.iMinTime = GetIniValue(DND_INI_RESOLVER, DND_INI_MINTIME, KDndIni_MinTime, 1, KMaxTInt);
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   151
	iParams.iMaxTime = GetIniValue(DND_INI_RESOLVER, DND_INI_MAXTIME, KDndIni_MaxTime, 1, KMaxTInt);
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   152
	iParams.iSetupTime = GetIniValue(DND_INI_RESOLVER, DND_INI_SETUPTIME, KDndIni_SetupTime, 1, KMaxTInt);
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   153
	iParams.iSetupPoll = GetIniValue(DND_INI_RESOLVER, DND_INI_SETUPPOLL, KDndIni_SetupPoll, 1, KMaxTInt);
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   154
	iParams.iSprayMode = GetIniValue(DND_INI_RESOLVER, DND_INI_SPRAYMODE);
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   155
	iParams.iSkipNotFound = GetIniValue(DND_INI_RESOLVER, DND_INI_SKIPNOTFOUND);
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   156
	iParams.iQueryHack = GetIniValue(DND_INI_RESOLVER, DND_INI_QUERYHACK);
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   157
	iParams.iFlushOnConfig = GetIniValue(DND_INI_RESOLVER, DND_INI_FLUSHONCONFIG);
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   158
	iParams.iQueryOrder = GetIniValue(DND_INI_RESOLVER, DND_INI_QUERYORDER, KDndIni_QueryOrder, 0, 5);
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   159
#ifdef _LOG
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   160
		{
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   161
		if (iParams.iQueryOrder & KQueryOrder_OneQuery)
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   162
			{
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   163
			_LIT(a, "A");
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   164
			_LIT(aaaa, "AAAA");
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   165
			Log::Printf(_L("\t\t= (only %S)"),
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   166
				(iParams.iQueryOrder & KQueryOrder_PreferA) ? &a : &aaaa);
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   167
			}
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   168
		else
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   169
			{
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   170
			_LIT(sequentially, "sequentially");
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   171
			_LIT(parallel, "in parallel");
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   172
			_LIT(aaaa_a, "AAAA, A");
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   173
			_LIT(a_aaaa, "A, AAAA");
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   174
			Log::Printf(_L("\t\t= (%S %S)"),
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diff changeset
   175
				(iParams.iQueryOrder & KQueryOrder_PreferA) ? &a_aaaa : &aaaa_a,
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diff changeset
   176
				(iParams.iQueryOrder & KQueryOrder_Parallel) ? &parallel : &sequentially);
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   177
			}
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   178
		}
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   179
#endif
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   180
	iParams.iEDNS0 = GetIniValue(DND_INI_RESOLVER, DND_INI_EDNS0, KDndIni_EDNS0, KDnsMinHeader, 65000);
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parents:
diff changeset
   181
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   182
#ifdef LLMNR_ENABLED
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   183
	iParams.iLlmnrLlOnly = GetIniValue(DND_INI_LLMNR, LLMNR_INI_LLONLY, KLlmnrIni_LlOnly);
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parents:
diff changeset
   184
	iParams.iLlmnrPort = GetIniValue(DND_INI_LLMNR, LLMNR_INI_PORT, KLlmnrIni_Port, 0, 65535);
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parents:
diff changeset
   185
	iParams.iLlmnrRetries = GetIniValue(DND_INI_LLMNR, LLMNR_INI_RETRIES, KLlmnrIni_Retries, 1, 255);
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parents:
diff changeset
   186
	iParams.iLlmnrMinTime = GetIniValue(DND_INI_LLMNR, LLMNR_INI_MINTIME, KLlmnrIni_MinTime, 0, KMaxTInt);
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parents:
diff changeset
   187
	iParams.iLlmnrMaxTime = GetIniValue(DND_INI_LLMNR, LLMNR_INI_MAXTIME, KLlmnrIni_MaxTime, 1, KMaxTInt);
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parents:
diff changeset
   188
	iParams.iLlmnrHoplimit = GetIniValue(DND_INI_LLMNR, LLMNR_INI_HOPLIMIT, KLlmnrIni_Hoplimit, -1, 255);
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parents:
diff changeset
   189
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   190
	// Note: both addresses are stored as IPv6 (TIp6Addr)
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parents:
diff changeset
   191
	GetIniAddress(DND_INI_LLMNR, LLMNR_INI_IPV4ADDR, KLlmnrIni_Ipv4Addr, iParams.iLlmnrIpv4);
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parents:
diff changeset
   192
	GetIniAddress(DND_INI_LLMNR, LLMNR_INI_IPV6ADDR, KLlmnrIni_Ipv6Addr, iParams.iLlmnrIpv6);
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parents:
diff changeset
   193
#endif
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parents:
diff changeset
   194
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diff changeset
   195
	// Setup the timeout manager
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parents:
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   196
	iTimer = TimeoutFactory::NewL();
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parents:
diff changeset
   197
	// Setup the "real" DNS resolver main
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parents:
diff changeset
   198
	iListener = MDndListener::NewL(*this);
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parents:
diff changeset
   199
	UnloadConfigurationFile();
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diff changeset
   200
	}
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parents:
diff changeset
   201
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   202
void CDndEngine::HandleCommandL(TInt aCommand)
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diff changeset
   203
	{
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   204
	switch(aCommand)
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parents:
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   205
		{
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   206
		case EDndDump:
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parents:
diff changeset
   207
			if (iListener)
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parents:
diff changeset
   208
				iListener->HandleCommandL(aCommand);
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parents:
diff changeset
   209
			else
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parents:
diff changeset
   210
				iMain.Write(_L("Listener not active.\n"));
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parents:
diff changeset
   211
			break;
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parents:
diff changeset
   212
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diff changeset
   213
		default:
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parents:
diff changeset
   214
			// No own commands, pass the buck to other modules
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parents:
diff changeset
   215
			if (iListener)
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parents:
diff changeset
   216
				iListener->HandleCommandL(aCommand);
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parents:
diff changeset
   217
		}
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parents:
diff changeset
   218
	}
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// CDndEngine::CheckResult
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// ***********************
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TInt CDndEngine::CheckResult(const TDesC &aText, TInt aResult)
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	/**
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	* If the result parameter is not KErrNone, output the
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	* error message (with error number).
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	*
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	* @param aText	message to be output in case of error
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	* @param aResult to be tested
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	* @return aResult
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	*/
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	{
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	_LIT(KFormat, "%S Error=%d");
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	if (aResult != KErrNone)
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		ShowTextf(KFormat, &aText, aResult);
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	return aResult;
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	}
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// CDndEngine::CheckResultL
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// ************************
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void CDndEngine::CheckResultL(const TDesC &aText, TInt aResult)
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	/**
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	* Output success or fail message, and Leave if the code is not
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	* KErrNone.
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	*
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	* @param aText	message to be output in case of error
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	* @param aResult to be tested
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	*/
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	{
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	if (CheckResult(aText, aResult) != KErrNone)
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		User::Leave(aResult);
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	}
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// CDndEngine::ShowText
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// ********************
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void CDndEngine::ShowText(const TDesC &aText)
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	/**
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	* Write a text message.
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	*
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	* @param aText	is the message
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	*/
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	{
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	iMain.Write(aText);
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	}
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// CDndEngine::ShowTextf
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// *********************
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void CDndEngine::ShowTextf(TRefByValue<const TDesC> aFmt, ...)
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	/**
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	* Write a message using format string.
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	*
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	* @param aFmt	is the format string
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	*/
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	{
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	//coverity[var_decl];
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	VA_LIST list;
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	VA_START(list,aFmt);
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	//coverity[uninit_use_in_call];
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	iMain.WriteList(aFmt, list);
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	}
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// CDndEngine::LoadConfigurationFile
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// *********************************
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TBool CDndEngine::LoadConfigurationFile()
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	/**
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	* Load the configuration file.
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	* Load the DND configuration file (INI file) into memory (iConfig),
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	* if not already loaded. Only try loading once, if attempt
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	* fails.
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	* The CDndEngine::FindVar functions call this implicitly. There is
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	* no need to call this explicitly.
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	*
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	* @return
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	* @li	TRUE, if configuration availabe (iConfig != NULL)
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	* @li	FALSE, if configuration file is not available
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	*/
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	{
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	if (iConfig)
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		return TRUE;	// Already loaded!
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	// if iConfigErr != 0 (KErrNone), then an attempt for
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	// loading configuration has been made and failed,
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	// assume it never will succeed and avoid further
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	// attemps on each FindVar...
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	if (iConfigErr)
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		return FALSE;
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	LOG(Log::Printf(_L("CDndEngine::LoadConfigurationFile(): %S"), &DND_INI_DATA));
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	TRAP(iConfigErr, iConfig = CESockIniData::NewL(DND_INI_DATA));
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	return (iConfig != NULL);
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	}
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// CDndEngine::UnloadConfigurationFile
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// ***********************************
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void CDndEngine::UnloadConfigurationFile()
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	/**
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	* Free the configuration data.
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	* The configuration information (INI file in iConfig) can be unloaded, if it is
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	* assumed that no further need for configuration is required.
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	*/
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	{
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	delete iConfig;
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	iConfig = NULL;
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	iConfigErr = 0;
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   323
	}
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//
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// Access to the configuration file
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   327
TBool CDndEngine::FindVar(const TDesC &aSection, const TDesC &aVarName, TPtrC &aResult)
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	/**
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	* @param aSection	the section name in the configution
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	* @param aVarName	the variable name within section
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	* @retval aResult	variable value, if found
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	* @return
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   333
	* @li TRUE, if variable found
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	* @li FALSE, if not found
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	*/
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	{
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	if (LoadConfigurationFile())
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		{
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		ASSERT(iConfig);	// <-- lint gag
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		return iConfig->FindVar(aSection, aVarName, aResult);
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		}
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	return FALSE;
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	}
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   344
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TBool CDndEngine::FindVar(const TDesC &aSection, const TDesC &aVarName, TInt &aResult)
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	/**
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	* @param aSection	the section name in the configution
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	* @param aVarName	the variable name within section
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	* @retval aResult	variable value, if found
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	* @return
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	* @li TRUE, if variable found
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	* @li FALSE, if not found
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	*/
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	{
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	if (LoadConfigurationFile())
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   356
		{
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		ASSERT(iConfig);	// <-- lint gag
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		return iConfig->FindVar(aSection, aVarName, aResult);
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		}
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	return FALSE;
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	}