author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:33:58 +0100 | |
branch | RCL_3 |
changeset 22 | 8d540f55e491 |
parent 21 | abbed5a4b42a |
permissions | -rw-r--r-- |
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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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// listener.h - name resolver query dispatcher header |
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// |
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|
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#ifndef __LISTENER_H__ |
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#define __LISTENER_H__ |
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/** |
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@file listener.h |
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Dispatch resolve requests to resolvers |
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@internalComponent Domain Name Resolver |
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*/ |
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#include <es_sock.h> |
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#include <in_sock.h> |
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#include "dns_hdr.h" |
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#include "servers.h" |
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#include "res_sock.h" |
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/** |
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@mainpage Domain Name Resolver Daemon (DND) |
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@section overview Overview |
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|
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The EPOC32 differs architecturally from the usual Unix resolver |
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library implementations: |
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|
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@li |
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Traditionally on Unix, the resolver library is linked with the application and from |
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the view point of the kernel, the application is just using additional sockets to |
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communicate with the name servers. |
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@li |
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on EPOC32, the name name resolver for the internet is implemented by the TCP/IP |
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protocol module, and is shared by all applications. Applications only establish |
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a session to this service via RHostResolver class. EPOC32 has standardised the |
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resolver interface, and each protocol can have its own implementation of the |
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service (with TCPIP protocol, all protocols use the same instance of the name |
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resolver). |
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|
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The IPv6/Ipv4 stack does not contain the name resolution code. Instead, |
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it provides a special socket API for a protocol named <b>resolver</b>, which |
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is used by an external server application providing the actual implementation |
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of the name resolution. |
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The stack maintains a <b>communication path</b> or session between user |
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RHostResolver and the resolver instance within the name resolver implementation. |
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This path is a chain of objects starting from the RHostResolver and ending |
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into CDndResolver, which performs the real name resolution using the other |
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modules of the name resolver application: |
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@verbatim |
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RHostResolver (application -> Socket Server) |
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CHostResolver (Socket Server -> TCPIP stack) |
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CDndSession (TCPIP stack -> gateway socket) |
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RSocket (gateway socket -> resolver application) |
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CDndResolver (resolver instance) |
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- use host files |
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- use UDP sockets to communicate with DNS servers |
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@endverbatim |
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The name resolver is a <b>server application</b> listening to the incoming |
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requests from a special <b>resolver</b> socket. |
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When an application requests a name resolution via some RHostResolver |
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method (GetByName, GetByAddress or Query), the resolver gateway code |
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in the stack (res.cpp) translates this into a message which is received |
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by the DND listener. The message includes a session id, which is assigned |
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by the resolver gateway. TDnsRequestBase defines the basic message format. |
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The name resolver receives the request and uses the session id in choosing |
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the correct resolver instance to serve the request. If a session does not |
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yet have a resolver, it will be allocated. |
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The resolver processes the request and returns the result as a reply |
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message to the socket. The resolver gateway will then translate the result |
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into RHostResolver completion. |
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@section components Major components of the implementation |
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@verbatim |
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Application . |
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===================== RHostResolver ========== |
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Socket Server . |
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===================== CHostResolver ========== |
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TCPIP Stack . |
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CDndSession |
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resolver . |
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gateway (session id) |
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============ socket =========================== |
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DND (session id) |
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. |
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main . |
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\ . |
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engine . |
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/ \ . |
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/ \ . |
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hosts \ . |
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file listener . |
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/ | \ . |
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/ | \ . |
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/ | \ . |
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DNS / DNS \ . |
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servers protocol resolvers |
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manager / . | . . . . |
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/ . | . . . . |
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/ . DNS . .. . |
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(LLMNR) . cache query |
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. . sessions |
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. |
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. |
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UDP/TCP |
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==== socket(s) ================================= |
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. |
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. |
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remote |
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DNS Server |
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@endverbatim |
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124 |
|
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@subsection main Main component |
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|
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The <b>main</b> contains the necessary glue and wrappings that are required to |
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run an application under EPOC32. The main implements the user interface of |
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the application. The standard DND is run as a <b>daemon process</b> and there |
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is no real user interface. However, the architecture also allows one to |
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write a main module with full user interface, if desired. |
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132 |
|
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The MDemonMain class defines the services which are required by the |
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resolver implementation (engine) from the main module. |
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135 |
|
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@subsection engine Engine component |
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137 |
|
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The <b>engine</b> contains usually the implementation of the application. |
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This is intended to be independent of the user interface. The class |
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MDemonEngine defines the API from engine to the <b>main</b>. |
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141 |
|
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In the name resolver implementation, the <b>engine</b> module is left as an |
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intermediate between the real implementation in the listener and the main |
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module. The CDndEngine is passed as the <b>control</b> instance to almost every |
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other component of the resolver implementation. <b>Engine</b> creates and owns |
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some common resources, for example: timer service (MTimeoutManager), |
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host files handler (RHostsFile) and the configuration |
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parameters (TDndConfigParameters). |
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149 |
|
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@subsection listener Listener component |
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151 |
|
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The listener (CDndListener) is the real <b>main program</b> of the name |
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resolver implementation. If opens the socket and listens to the |
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incoming request messages. |
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155 |
|
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Using the session id, the listener delegates the task of |
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serving the session to an available resolver instance (CDndResolver). |
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158 |
|
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@subsection resolvers Resolver component |
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160 |
|
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The <b>resolver</b> (CDndResolver) serves one RHostResolver session at time. |
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The same session may serve different RHostResolver's at different times. |
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It receives the requests from the gateway socket via the listener. |
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The resolver state diagram is roughly |
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165 |
|
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@verbatim |
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167 |
Start |
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|----------------> Stop |
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Receive a Query |
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|----------------> Stop |
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Return first result |
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| |
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+-->| |
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| | - - -> listener forced Stop |
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| | |
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| |----------------> Stop |
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| Receive Next Query |
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| |----------------> Stop |
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| Return next result |
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+---| |
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Stop |
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@endverbatim |
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183 |
|
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Because many applications are only interested about the first result, |
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and because they often leave the RHostResolver session(s) open, the |
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gateway may sometimes <em>steal a session for a new RHostResolver</em>, |
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if all resolvers are already busy. The oldest resolver that has returned |
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at least one answer is assigned to the new RHostResolver. |
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189 |
|
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The "stealing action" action does not harm the application in any other way, |
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except that if it now tries to call Next(), it will return an error. If |
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such application issues a new query (GetByName, GetByAddress or Query), |
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a new resolver is just assigned to serve it. |
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194 |
|
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The resolver session is always stopped, after query has |
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completed (no further answers are available). |
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197 |
|
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The resolver performs its work by establishing a number of query |
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sessions (MDnsSession) with the DNS protocol module. The progress |
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of an active query session is reported through callbacks |
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(MDnsResolver). |
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202 |
|
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@subsection hosts Host File component |
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|
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The hosts file handler (RHostsFile) provides the service for looking an |
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answer from the local hosts file (if any is present). Only the GetByName |
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or GetByAddr queries can be satisfied from the hosts file. The "hosts" |
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file has a very simple format which binds a name to an address, |
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for example: |
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|
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@verbatim |
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127.0.0.1 localhost |
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10.0.0.2 server |
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10.0.0.3 server |
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10.0.0.3 alternatename |
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fe80::dead:beef local-beef |
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::1 localhost6 |
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ff02::1 allnodes6 |
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ff02::2 allrouters6 |
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ff02::3 allhosts6 |
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|
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@endverbatim |
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@subsection dnsclient DNS Protocol implementation |
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|
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The DNS procotol is implemented by CDndDnsclient class (or by some derived class). The |
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class exports MDnsSource API, which is used by the resolvers to start query sessions |
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(MDnsSession), which send and receive the actual DNS protocol messages. |
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|
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@subsection llmnr Link Local Multicast Name Resolution |
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|
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The link local multicast name resolution uses the DNS protocol with link local |
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multicast. The DNS protocol messages are sent to the link with multicast |
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destinations and a node that owns the queried name, will respond as if it |
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was a DNS server. |
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|
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When LLMNR is compiled in, the DNS protocol is implemented by CDndLlmnrSender |
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class, which is derived from the CDndDnsclient. This class extends the normal |
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DNS with the link local multicast name resolution additions. |
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|
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|
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@subsection servers Server Manager component |
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|
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The server manager (MDnsServerManager) maintains the list of currently known and |
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avalable DNS servers. The content of the list may be constantly changing depending |
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on which interfaces are active at any particular point of time. The issues are even |
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more complicated by the fact that initially there are no interfaces up (or at least, |
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there may be no known servers), and name resolver just has to wait until something |
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becomes available. |
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|
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@subsection cache DNS Cache |
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|
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The cache component (CDndCache) stores cached answers from the DNS servers. When |
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resolvers send questions to the protocol module, the cache is first checked for |
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a matching valid answer. If found, the cached answer is returned to the resolver, |
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and no actual queries need to be sent. |
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|
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@section scoped_dns Scoped name resolution architecture |
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|
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The answers to a query can be found from different sources at different scope |
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levels. This implementation uses three levels: |
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|
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@li |
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the <b>hosts file</b> is a node local scope source. |
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|
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@li |
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the <b>"real" DNS</b> is a global scope source. |
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|
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@li |
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<b>LLMNR</b> is a link local scope source. |
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|
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The above order is also the current default order of the sources: first, |
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the <b>hosts</b> file is checked, then real DNS and finally, the link local name |
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resolution is attempted. The first source to give an answer defines the whole |
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answer. Answers from different sources are never mixed. |
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|
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A scope level is assigned to all queries that are received. Currently a global |
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scope is given to all GetByName and Query requests. The scope level of the |
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GetByAddress is the scope level of queried address. |
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|
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For a specific query, only sources that have same or smaller scope level are used. |
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For example, only LLMNR is used, when GetByAddress to a link local address |
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(169.254/16 or fe80::/10) is requested. |
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|
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GetByName queries could also have other than global scope. For example, |
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it could be agreed that a query for a name ending with ".local" would have a |
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link local scope, and thus only LLMNR would be tried for it (the current |
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implementation does not have such feature coded). |
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|
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|
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*/ |
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|
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/** |
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// The size of the resolver pool. This defines how many simultaneous |
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// clients (opened RHostResolver's) are served. Note, that this does |
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// is not set a limit for the total number open RHostResolver's in all |
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// applications. If there are more than KDndNumResolver RHostResolvers, |
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// the resolver gateway (res.cpp in the stack) will maintain a queue, and |
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// assign the service to applications, when resolvers become available |
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// from the pool. |
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*/ |
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const TUint KDndNumResolver = 31; |
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/** |
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// Special Progress Notifications for the TReplyCallback: query has been sent. |
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// |
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// KDnsNotify_QUERY_SENT |
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// occurs when the DNS query has actually been sent to the |
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// server (e.g. socket write completes). Normally this occurs |
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// very fast after DoQueryL(), except when the packet or DNS |
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// has to activate the "netdial startup". In such case, the |
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// sending is blocked until the interface becomes available. |
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*/ |
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const TInt KDnsNotify_QUERY_SENT = 1; |
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/** |
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// Special Progress Notifications for the TReplyCallback: DNS server list is available. |
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// |
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// KDnsNotify_HAVE_SERVERLIST |
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// occurs when the DNS has found at least one DNS server |
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// address. This signal is only returned if MDnsSession::NewQuery |
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// returned with > 0 (indicating it started interface startup). |
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*/ |
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const TInt KDnsNotify_HAVE_SERVERLIST = 2; |
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/** |
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// The request is using TCP instead of UDP. |
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329 |
// |
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// KDnsNotify_USING_TCP |
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// occurs when the DNS decides to use a connected TCP socket |
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// for the query to the DNS server. This may happen on receipt of |
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// DNS reply with TC=1 (truncated), or if some configuration setting |
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// forces the use of TCP. |
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// |
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// The expected effect should be to disable the retransmission |
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// logic of the resolver, because TCP handles it internally. |
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*/ |
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const TInt KDnsNotify_USING_TCP = 3; |
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340 |
|
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// -- for now, no other notifys -- |
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342 |
|
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343 |
/** |
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344 |
// Query modifier flag -- KDnsModifier_RD |
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345 |
// |
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// Used in aFlags parameter of MDnsSession::NewQuery. This controls |
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// the state of RD (Recursion Desired) bit in the DNS query messages |
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// generated from for this query. Normally, this is always set. |
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349 |
*/ |
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const TUint32 KDnsModifier_RD = 1; |
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351 |
|
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352 |
/** |
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353 |
// |
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354 |
// Set probe flag -- KDnsModifier_PQ |
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355 |
// |
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// Set in ProbeServer() to switch off worker assigning for the query. |
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// If not set, DNS will check if there's already same query assigned |
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// to some resolver. |
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359 |
// |
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360 |
*/ |
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const TUint32 KDnsModifier_PQ = 2; |
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362 |
|
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363 |
/** |
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364 |
// The query session. |
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365 |
// |
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366 |
// The query session is a handle through which the resolver can request |
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// the DNS protocol module to do queries and return answers to them. The |
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// use of separatate session concept (instead of having the methods |
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// directly on MDnsSource) allows resolver to do multiple queries |
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// in parallel. |
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371 |
// |
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// The usage is: |
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373 |
// |
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// @li (1) open a session with MDnsSource::OpenSession |
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// @li (2) define the domain name using MDnsSession::NewQuery |
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// @li (3) activate a specific query (type) with MDnsSession::DoQueryL |
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// @li (3) after the query is complete (MDnsResolver::ReplyCallback), |
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// retrieve answers one by one with repeated calls to MDnsSession::DoNext |
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// @li (4) session can be used for another query with same domain-name (-> 3), |
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// or different domain-name (-> 2) |
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// @li (6) when session is no more needed, it must be released by MDnsSession::Close |
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382 |
// |
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// The MDnsSession::CancelQuery can be used at any point to cancel |
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// all activity, that has been started by MDnsSession::DoQueryL. |
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385 |
// |
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386 |
// When a DNS server is required, the query session will select the current |
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// default server. This choice will not be changed even if the server is not |
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// responding or is not reachable. It is the duty of the controlling resolver |
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// to decide when to try another server, if any are available. For this |
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// purpose, the MDnsSession has the following methods: |
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391 |
// |
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392 |
// @li MDnsSession::PickDefaultServer, reset to default |
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// @li MDnsSession::PickNewServer, pick next server in list |
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394 |
*/ |
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class MDnsSession |
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396 |
{ |
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397 |
public: |
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398 |
/** |
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399 |
// Load new query information to be resolved. |
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400 |
// |
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401 |
// Load a new query into session by converting the information from the |
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// TNameRecord or TDnsQuery into DNS format. This only loads the name |
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// to be queried, it does not define query type or class. |
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404 |
// |
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// For TNameRecord, if the iName field is empty, then iAddr is used to |
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// construct a name to be searched (*.in-addr.arpa or .ip6.int). |
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407 |
// |
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408 |
// @param aQuery |
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// defines the name or address to be queried. Does not define |
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// the actual query type. This same question may be used for |
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// different query types (for example A and AAAA). |
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// @param aServerScope |
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// the scope level of the query. This limits the servers that |
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// are going to be used. |
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// @param aFlags |
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416 |
// modify the query operation. See KDnsModifier_* symbols. |
22 | 417 |
// @aSuffixSupportEnabled |
418 |
// switch on/off the domain suffix based name resolution support |
|
0
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419 |
// |
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// @returns |
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421 |
// @li < 0, if load failed (bad query information) |
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// @li = 0, if query initialized (KErrNone) |
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423 |
*/ |
22 | 424 |
virtual TInt NewQuery(const TDnsMessage &aQuery, TDnsServerScope aServerScope, TUint32 aFlags, TBool aSuffixSupportEnabled) = 0; |
0
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425 |
/** |
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426 |
// Cancel query activity |
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427 |
// |
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|
428 |
// Cancel all (if any) activity caused by a DoQueryL on this session. |
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|
429 |
// This makes session usable for a new query, it does not close the |
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430 |
// session. MDnsResolver::ReplyCallback is disabled and not called |
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431 |
// (until reactivated by a new DoQueryL). |
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432 |
*/ |
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|
433 |
virtual void CancelQuery() = 0; |
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434 |
/** |
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|
435 |
// Activate a query of specified type for the loaded query information. |
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|
436 |
// |
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437 |
// Enables the MDnsResolver::ReplyCallback. |
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|
438 |
|
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|
439 |
// @param aRequestTime |
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440 |
// the time when resolver received the request that is causing this |
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441 |
// query to be asked. The value is mainly used to determine whether |
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442 |
// the cached answer is still valid for this request. |
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443 |
// @param aQType |
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444 |
// the actual query to be done. IN class is assumed. |
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445 |
// |
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446 |
// @returns |
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447 |
// @li < 0, if query cannot be activated |
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448 |
// @li = 0, if query processed (KErrNone) |
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449 |
*/ |
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450 |
virtual TInt DoQueryL(const TTime &aRequestTime, const EDnsQType aQType) = 0; |
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451 |
/** |
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452 |
// Retrieve answer RR's from the previous completed reply. |
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453 |
// |
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454 |
// @param aReply |
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455 |
// the reply buffer that receives the ansver |
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456 |
// @param aNext |
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457 |
// the index of the answer to return. The first answer has the |
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458 |
// index == 0. |
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459 |
// |
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460 |
// @returns |
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461 |
// @li < 0, if no more answers, or some error is detected |
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462 |
// @li = 0, if requested answer has been placed into aReply |
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463 |
*/ |
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464 |
virtual TInt DoNext(TDnsMessageBuf &aReply, TInt aNext) const = 0; |
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465 |
/** |
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466 |
// Set current record into error state. |
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|
467 |
// |
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468 |
// @param aError |
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469 |
// the error code to set |
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470 |
// @param aTTL |
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471 |
// the lifetime (seconds) for the error to persist |
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472 |
// in the cache before it becoming invalid. |
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473 |
*/ |
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474 |
virtual void DoError(TInt aError, TUint aTTL) = 0; |
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475 |
/** |
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476 |
// Choose next server for the session. |
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|
477 |
// |
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478 |
// @returns |
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479 |
// @li TRUE, if a different server could be picked |
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480 |
// @li FALSE, if no different server available |
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|
481 |
*/ |
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482 |
virtual TBool PickNewServer() = 0; |
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483 |
/** |
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484 |
// Set default server for the session. |
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485 |
// |
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486 |
// Reassign the session to the current chosen "best" server |
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487 |
// (if any). |
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488 |
// |
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|
489 |
// @returns |
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|
490 |
// @li TRUE, if a server was selected (or still waiting configuration to stabilise) |
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|
491 |
// @li FALSE, otherwise (no suitable servers at this point). |
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|
492 |
*/ |
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|
493 |
virtual TBool PickDefaultServer() = 0; |
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|
494 |
/** |
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495 |
// Close the session. |
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|
496 |
// |
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|
497 |
// Release resources associated with the session and |
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|
498 |
// make it available for re-use. CancelQuery is done |
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|
499 |
// automaticly. |
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|
500 |
*/ |
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|
501 |
virtual void Close() = 0; |
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|
502 |
|
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|
503 |
// Return instance ptr of the actual class instance (only for comparisons) |
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504 |
virtual const void *const Instance() const = 0; |
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|
505 |
}; |
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|
506 |
|
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|
507 |
|
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|
508 |
class MDnsResolver |
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|
509 |
{ |
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|
510 |
public: |
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|
511 |
/** |
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|
512 |
// Response callback. |
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|
513 |
// |
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Revision: 201004
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|
514 |
// After a query has been activated by MDnsSession::DoQueryL, |
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|
515 |
// its progress and completion is reported back by a call |
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|
516 |
// to this callback function. The callback may also occur |
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|
517 |
// during the DoQueryL. |
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|
518 |
// |
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Revision: 201004
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|
519 |
// A completion is indicated by a result <= 0. Results > 0 |
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Revision: 201004
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|
520 |
// are intermediate notifications. |
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|
521 |
// |
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Revision: 201004
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|
522 |
// @param aErr is defined as follows: |
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Revision: 201004
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|
523 |
// @li < 0, query complete result, some error condition |
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Revision: 201004
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|
524 |
// @li = 0, query complete result, success |
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Revision: 201004
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|
525 |
// @li > 0, query progress notification from DNS. |
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Revision: 201004
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|
526 |
// Currently, only two are used: KDnsNotify_QUERY_SENT, notification |
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Revision: 201004
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|
527 |
// that query has been sent, and KDnsNotify_HAVE_SERVERLIST, notification |
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Revision: 201004
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|
528 |
// that DNS provider has some server list available (which could be empty). |
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|
529 |
*/ |
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Revision: 201004
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|
530 |
virtual void ReplyCallback(const TInt aResult) = 0; |
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Revision: 201004
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parents:
diff
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|
531 |
}; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
532 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
533 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
534 |
// DNS protocol services |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
535 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
536 |
// This is a handle to the DNS protocol and some other services. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
537 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
538 |
class MDnsSource |
af10295192d8
Revision: 201004
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parents:
diff
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|
539 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
540 |
public: |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
541 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
542 |
// Open a session. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
543 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
544 |
// @param aCallback |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
545 |
// The reply callback to be used in reporting events back |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
546 |
// @param aCallbackData |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
547 |
// The fixed data provided by the callback call |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
548 |
// @returns |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
549 |
// @li MDnsSession, if open succeeded |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
550 |
// @li NULL, if session could not be opened |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
551 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
552 |
virtual MDnsSession *OpenSession(MDnsResolver *const aCallback) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
553 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
554 |
// Check if there is a route and valid source address for the aDestination. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
555 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
556 |
// @param aDestination The address to test |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
557 |
// @returns |
af10295192d8
Revision: 201004
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parents:
diff
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|
558 |
// @li KErrNone, if address is usable (route exists) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
559 |
// @li KErrNotFound, if no route or valid source addess exists |
af10295192d8
Revision: 201004
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parents:
diff
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|
560 |
// @li < 0, possible other errors (from failing to open sockets etc.) |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
561 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
562 |
virtual TInt CheckAddress(const TInetAddr &aDestination) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
563 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
564 |
// Resolver has received a query from application. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
565 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
566 |
// Just book keeping, which enables the protocol handler to |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
567 |
// release resources, if there are no active queries. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
568 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
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|
569 |
virtual void QueryBegin() = 0; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
570 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
571 |
// Resolver has completed the query from application. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
572 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
573 |
// Just book keeping, which enables the protocol handler to |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
574 |
// release resources, if there are no active queries. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
575 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
576 |
virtual void QueryEnd() = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
577 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
578 |
// Change the hostname. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
579 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
580 |
// This informs the LLMNR about the current hostname. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
581 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
582 |
// @param aId The network id |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
583 |
// @param aName The new host name |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
584 |
// @return KErrNone, if changed. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
585 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
586 |
virtual TInt SetHostName(TUint32 aId, const THostName &aName) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
587 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
588 |
// Get current hostname. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
589 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
590 |
// If LLMNR is enabled and uniqueness testing is still in progressm, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
591 |
// since the last SetHostName then the callback is installed to be |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
592 |
// called when testing is complete. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
593 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
594 |
// @param aId The network id |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
595 |
// @retval aName |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
596 |
// The current hostname (always returned) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
597 |
// @param aCallBack |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
598 |
// If return is pending (= 1), then the callback WILL be |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
599 |
// called when the result of the uniqueness test is |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
600 |
// known. Otherwise callback is NOT used. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
601 |
// @return |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
602 |
// @li KErrNone, if the name is unique on current interfaces (no callback) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
603 |
// @li = 1, if uniqueness test is in progress (callback installed) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
604 |
// @li < 0, if uniqueness test is complete, and failed (no callback) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
605 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
606 |
virtual TInt GetHostName(TUint32 aId, THostName &aName, MDnsResolver &aCallback) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
607 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
608 |
// Check for own address. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
609 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
610 |
// @param aId The network id |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
611 |
// @param aAddr The address to check |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
612 |
// @param aNext Non-zero, when next processing |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
613 |
// @retval aName The returned local host name matching the address. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
614 |
// @return KErrNone, if address was a local and name is returned |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
615 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
616 |
virtual TInt GetByAddress(TUint32 aId, const TInetAddr &aAddr, TInt aNext, THostName &aName) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
617 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
618 |
// Check for own name. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
619 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
620 |
// @param aId The networkd id |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
621 |
// @param aName The local host name |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
622 |
// @param aNext Non-zero, when next processing |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
623 |
// @retval aAddr The own address |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
624 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
625 |
virtual TInt GetByName(TUint32 aId, const THostName &aName, TInt aNext, TInetAddr &aAddr) = 0; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
626 |
}; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
627 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
628 |
class CDndEngine; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
629 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
630 |
// MDndListener |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
631 |
// ************ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
632 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
633 |
// Main "module" implementing the resolver gateway. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
634 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
635 |
// Function |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
636 |
// |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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637 |
// The listener owns several resolver objects. It waits for |
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// any request from the applications, and whenever it receives one, |
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// it passes the request to the resolver object. |
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*/ |
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class MDndListener |
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{ |
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public: |
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static MDndListener *NewL(CDndEngine &aControl); |
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virtual ~MDndListener() { } |
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// for debugging only (not used currently) |
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virtual void HandleCommandL(TInt aCommand) = 0; |
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|
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/** |
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* Called when a resolver has a reply ready to be returned. |
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* |
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* The writer will eventually ask the resolver for the buffer |
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* using the MdndResolver::ReplyMessage. This should return |
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* ZERO length descriptor, if there is no reply to send. |
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*/ |
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virtual void PostReply() = 0; |
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}; |
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|
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#endif |