tcpiputils/dnd/inc/servers.h
author William Roberts <williamr@symbian.org>
Wed, 10 Nov 2010 13:36:07 +0000
branchRCL_3
changeset 79 4b172931a477
parent 75 c1029e558ef5
permissions -rw-r--r--
Make configchange.pl run ceddump.exe with -dtextshell - Bug 3932
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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// servers.cpp - server manager module
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//
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#ifndef __SERVERS_H__
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#define __SERVERS_H__
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/**
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@file servers.h
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DNS server list maintenance
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@internalComponent	Domain Name Resolver
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*/
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#include <in_sock.h>
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/**
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// @brief	The name resolution scope level and type (multicast or unicast)
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//
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// The server scope defines the scope level [1..16] which is
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// served by the server. Additionally, the scope is stored
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// either as positive integer (if resolution is based on
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// multicast strategy), or negative number if resolution is
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// based on traditional DNS server.
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//
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// Currently only two server scopes are used:
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// @li	Link Local Scope, using multicast resolution (LLMNR)
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// @li	Global Scope, using unicast resolution (the traditional DNS)
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*/
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typedef enum
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	{
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	// Node local hosts file Resolution
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	EDnsServerScope_HOSTFILE = 0,
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	// Globan Unicast Resolution
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	EDnsServerScope_UC_GLOBAL = -KIp6AddrScopeGlobal,
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	// Link Local Multicast Resolution
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	EDnsServerScope_MC_LOCAL = KIp6AddrScopeLinkLocal
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	} TDnsServerScope;
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// Select a virtual sublist of currently known servers
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class TDnsServerFilter
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	{
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public:
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	inline TBool IsUnicast() const { return iServerScope < 0; }
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	inline TBool IsMulticast() const { return iServerScope > 0; }
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	TInt iServerId;					//< Current default server (0 = first matching server)
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	TUint32 iLockId;				//< Eligible severs must be from "locked" scope
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	TUint8 iLockType;				//< Locked scope level [1,,16]
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	TDnsServerScope iServerScope:8;	//< Server scope and type
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	};
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class MDnsServerListNotify
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	{
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public:
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	// Called when the requested server list has become known (if request was pending)
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	virtual void ServerListComplete(const TDnsServerFilter &aList, TInt aResult) = 0;
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	};
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class MDnsServerManager
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	{
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public:
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	/**
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	// @brief Virtual desctructor.
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	//
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	// The actual server manager object can be deleted by a delete of this mixin class.
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	*/
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	virtual ~MDnsServerManager() {}
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	/**
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	// @brief Informs that the system configuration has changed.
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	// This triggers the rescanning of the interfaces and
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	// availabla name server addresses.
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	*/
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	virtual void ConfigurationChanged() = 0;
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	/**
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	// @brief	Open the server list (if not already open)
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	// @param	aFilter	the server filter
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	// @param	aNotify	the callback, which is used only if server list is not yet available
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	// @returns
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	//	@li	< 0, fatal error (notify callback is not installed)
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	//	@li = 0, server list is available (notify callback is not installed)
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	//	@li > 0, server list is not available, the notify callback will be called later
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	*/
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	virtual TInt OpenList(const TDnsServerFilter &aFilter, MDnsServerListNotify *aNotify) = 0;
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	/**
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	// @brief	Count the number of servers matching the filter
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	// @param	aFilter	the server filter
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	// @returns	the number of servers matching the filter
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	*/
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	virtual TInt Count(const TDnsServerFilter &aFilter) const = 0;
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	/**
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	// @brief	Return id of the next matching server after the specified server
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	// @param	aFilter	the server filter
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	// @param	aServerId	id of the current server (if = 0, the first matching server is returned)
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	// @returns
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	//	@li	< 0, error [does not happen currently]
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	//	@li = 0, there is no next server (server list is empty or only had the single server)
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	//	@li > 0, is the id of the next server ( != aServerId)
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	*/
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	virtual TInt Next(const TDnsServerFilter &aFilter, TInt aServerId) const = 0;
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	/**
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	// @brief	Request is not using the serverlist anymore
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	// @param	aFilter	the server filter (cancel notify callback for this)
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	*/
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	virtual void CloseList(const TDnsServerFilter &aFilter) = 0;
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	/**
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	// @brief	Return the IP addres of the server
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	// @param	aServerId	identify the server
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	// @retval	aAddr		the server address corresponding to the server id, if return OK
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	// @returns
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	//	@li	KErrNone (OK), if a server with the specified ID exist and address returned
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	//	@li KErrNotFound, if there is no server corresponding the specified id
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	*/
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	virtual TInt Address(TInt aServerId, TInetAddr &aAddr) const = 0;
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	/**
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	// @brief	Assuming addr came from the server, return the matching scope id
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	// @param	aServerId	identify the server
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	// @param	aAddr		the address to examine
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	// @returns
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	//	@li = 0,  cannot find scope id for the address (probably no server matching the id)
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	//	@li != 0, is the scope id for the address assuming it originated from the specified server
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	*/
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	virtual TUint32 Scope(TInt aServerId, const TInetAddr &aAddr) = 0;
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	/**
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	// @brief	Search server id by server address
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	// @param	aAddr	a address of the server to be looked (must be KAfInet6)
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	// @returns	the corresponding server id (> 0), if the list contained a
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	//			matching server
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	*/
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	virtual TInt ServerId(const TInetAddr &aAddr) const = 0;
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	/**
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	// @brief	Return the name space id matching the filter
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	// @param	aFilter	the server filter
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	// @param	aServerId the specific server, if non-zero
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	// @returns
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	//	@li = 0, cannot find the name space id
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	//	@li != 0, is the name space id corresponding the filter
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	*/
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	virtual TUint32 NameSpace(const TDnsServerFilter &aFilter, TInt aServerId) const = 0;
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	/**
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	// @brief	Rebuild interface and server lists
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	// @returns
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	//	@li KErrNone, if list rebuilt successfully (list can be empty!)
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	//	@li < 0, if there are some fatal socket errors
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	*/
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	virtual TInt BuildServerList() = 0;
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	/**
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	// @brief	Add DNS server address for a interface
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	//
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	// The specified address will be included into the server list when the
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	// named interface is active.
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	//
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	// @param	aInterface	is the name of the interface
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	// @param	aAddr		DNS server address
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	//
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	*/
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	virtual void AddServerAddress(const TName &aInterface, const TInetAddr &aAddr) = 0;
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	/**
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	// @brief	Lock filter scope by address
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	// @param	aAddr	the address
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	// @param	aNetwork	the network id
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	// @param	aFilter	the server filter to modify
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	*/
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	virtual void LockByAddress(const TInetAddr &aAddr, TUint32 aNid, TDnsServerFilter &aFilter) = 0;
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	};
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class CDndEngine;
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class DnsServerManager
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	{
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public:
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	// Create a new server manager instance
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	static MDnsServerManager *NewL(CDndEngine &aControl);
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	};
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#endif