--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tcpiputils/dnd/inc/engine.h	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,137 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// engine.h - name resolver core engine header
+//
+
+#ifndef __ENGINE_H
+#define __ENGINE_H
+#include <s32file.h>
+#include <es_sock.h>
+#include <in_sock.h>
+
+/**
+@file engine.h
+Engine component
+@internalComponent	Domain Name Resolver
+*/
+
+#include "demon.h"
+#include "hosts.h"
+
+const TUint KQueryOrder_PreferA = 0x1;	//< if set, send A first, and then AAAA (preferred query) 
+const TUint KQueryOrder_Parallel = 0x2;	//< if set, activate both queries without waiting the first to complete.
+const TUint KQueryOrder_OneQuery = 0x4;	//< if set, send only the preferred query (either A or AAAA)
+/**
+// Configuration parameter which are extracted from the [resolver] sections
+*/
+class TDndConfigParameters
+	{
+public:
+	TUint iRetries;			//< # of query retransmissions (not counting the first)
+	TUint iMinTime;			//< Minimum time for retransmit
+	TUint iMaxTime;			//< Maximum time for the total query to complete or fail (when server is known)
+	TUint iSetupTime;		//< Maximum time to wait for DNS server to become known
+	TUint iSetupPoll;		//< While waiting DNS server, interval for rechecking status (even if no monitor events)
+	TUint iSprayMode:1;		//< Each query is sent to all servers with iMinTime interval (on each try)
+	TUint iSkipNotFound:1;	//< Ignore "Name not found" answers from server and try another server.
+	TUint iQueryHack:1;		//< Enable "QUERYTYPE?Name" special queries
+	TUint iQueryOrder:3;	//< Define how A and AAAA queries are to be used.
+	TUint iFlushOnConfig:1;	//< Flush DNS cache on intereface configuration change.
+#ifdef LLMNR_ENABLED
+    TUint iLlmnrLlOnly:1;   //< Accept only link-local replies to LLMNR queries
+    TUint iLlmnrPort;       //< Default port of the Linklocal Multicast Name Resolver
+	TUint iLlmnrRetries;	//< # of LLMNR query retransmissions (not counting the first)
+	TUint iLlmnrMinTime;	//< Minimum time to retransmit the LLMNR query
+	TUint iLlmnrMaxTime;	//< Maximum time to do LLMNR query
+	TInt  iLlmnrHoplimit;	//< The IP Hoplimit (TTL) to be used in LLMR/MDNS packets.
+	TIp6Addr iLlmnrIpv4;	//< The IPv4 multicast address
+	TIp6Addr iLlmnrIpv6;	//< The IPv6 multicast address
+#endif
+	TUint iEDNS0;			//< Enable EDNS0, if >= KDnsMaxMessage, value is receive payload size.
+	};
+
+class MTimeoutManager;
+class MDndListener;
+class CESockIniData;
+/**
+// Engine part of the DND implementation.
+// 
+// Function
+//
+// @li	The engine (there will be only one instantiation) acts as the controller.
+// @li	Creates and owns the CdndListener.
+// @li	Maintains the communication between the other componens and the console.
+//
+// Contains
+//
+// @li	CDndListener object -  to accept socket connection from the applications requiring service
+// @li	A view - to show error and log messages
+// @li	A File Server handle
+// @li	A Socket Server handle
+// @li	A timeout manager instance for other components to use
+*/
+class CDndEngine : public CBase, public MDemonEngine
+	{
+public:
+	CDndEngine(MDemonMain &aMain) : iMain(aMain), iHostsFile(iFS) {}
+	~CDndEngine();
+	void ConstructL();
+	void HandleCommandL(TInt aCommand);
+
+	MDemonMain &iMain;			//< The reference to the main application
+public:
+	RFs iFS;					//< A File Server session (opened/closed by engine)
+	RSocketServ iSS;			//< A Socket Server session (opened/opened by engine)
+	RHostsFile iHostsFile;		//< The hosts file source
+	RSocket iSocket;			//< And Open UDP socket,for all to use for SetOpt/GetOpt only.
+
+	// @brief If aResult < 0 (= error), output message and leave
+	void CheckResultL(const TDesC &aText, TInt aResult);
+	// @brief If aResult < 0 (= error), output messsage
+	TInt CheckResult(const TDesC &aText, TInt aResult);
+	// @brief Output text message (line)
+	void ShowText(const TDesC &aText);
+	//	@brief Oupput text message using format (line)
+	void ShowTextf(TRefByValue<const TDesC> aFmt, ...);
+	//
+	// Access to the configuration file
+	//
+	// @brief	Find integer value from configuration with automatic min/max and default checking.
+	TInt GetIniValue(const TDesC &aSection, const TDesC &aName, TInt aDefault = 0, TInt aMin = 0, TInt aMax = 1);
+	// @brief	Find IP address value from configuration.
+	void GetIniAddress(const TDesC &aSection, const TDesC &aName, const TDesC &aDefault, TIp6Addr &aAddr);
+	// @brief	Find string value from configuration
+	TBool FindVar(const TDesC &aSection, const TDesC &aVarName,TPtrC &aResult);
+	// @brief	Find integer value from configuration
+	TBool FindVar(const TDesC &aSection, const TDesC &aVarName,TInt &aResult);
+	// @brief Release Configuration data
+	void UnloadConfigurationFile();
+	// @return parsed configuration parameters
+	inline const TDndConfigParameters &GetConfig() const { return iParams; }
+	// @return handle for the Timeout manager
+	MTimeoutManager &Timer() { return *iTimer; }
+
+private:
+	// @brief Called implicitly by FindVar methods
+	TBool LoadConfigurationFile();
+
+	CESockIniData *iConfig;				//< Configuration data
+	TInt iConfigErr;					//< Non-zero, if configuration file is not available
+	TDndConfigParameters iParams;		//< Parsed configuration parameters
+
+	MTimeoutManager *iTimer;			//< Generic timer handler (made available for all components)
+	MDndListener *iListener;			//< The listener instance
+	};
+
+#endif