565 lines
21 KiB
Java
565 lines
21 KiB
Java
/*
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* Copyright 2015 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver.dns;
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import io.netty.channel.ChannelFactory;
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import io.netty.channel.EventLoop;
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import io.netty.channel.ReflectiveChannelFactory;
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import io.netty.channel.socket.DatagramChannel;
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import io.netty.channel.socket.InternetProtocolFamily;
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import io.netty.channel.socket.SocketChannel;
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import io.netty.resolver.HostsFileEntriesResolver;
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import io.netty.resolver.ResolvedAddressTypes;
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import io.netty.util.concurrent.Future;
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import io.netty.util.internal.UnstableApi;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import static io.netty.resolver.dns.DnsServerAddressStreamProviders.platformDefault;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import static io.netty.util.internal.ObjectUtil.intValue;
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/**
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* A {@link DnsNameResolver} builder.
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*/
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@UnstableApi
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public final class DnsNameResolverBuilder {
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private EventLoop eventLoop;
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private ChannelFactory<? extends DatagramChannel> channelFactory;
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private ChannelFactory<? extends SocketChannel> socketChannelFactory;
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private DnsCache resolveCache;
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private DnsCnameCache cnameCache;
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private AuthoritativeDnsServerCache authoritativeDnsServerCache;
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private Integer minTtl;
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private Integer maxTtl;
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private Integer negativeTtl;
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private long queryTimeoutMillis = 5000;
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private ResolvedAddressTypes resolvedAddressTypes = DnsNameResolver.DEFAULT_RESOLVE_ADDRESS_TYPES;
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private boolean completeOncePreferredResolved;
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private boolean recursionDesired = true;
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private int maxQueriesPerResolve = 16;
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private boolean traceEnabled;
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private int maxPayloadSize = 4096;
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private boolean optResourceEnabled = true;
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private HostsFileEntriesResolver hostsFileEntriesResolver = HostsFileEntriesResolver.DEFAULT;
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private DnsServerAddressStreamProvider dnsServerAddressStreamProvider = platformDefault();
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private DnsQueryLifecycleObserverFactory dnsQueryLifecycleObserverFactory =
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NoopDnsQueryLifecycleObserverFactory.INSTANCE;
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private String[] searchDomains;
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private int ndots = -1;
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private boolean decodeIdn = true;
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/**
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* Creates a new builder.
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*/
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public DnsNameResolverBuilder() {
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}
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/**
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* Creates a new builder.
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*
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* @param eventLoop the {@link EventLoop} which will perform the communication with the DNS
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* servers.
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*/
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public DnsNameResolverBuilder(EventLoop eventLoop) {
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eventLoop(eventLoop);
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}
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/**
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* Sets the {@link EventLoop} which will perform the communication with the DNS servers.
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*
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* @param eventLoop the {@link EventLoop}
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* @return {@code this}
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*/
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public DnsNameResolverBuilder eventLoop(EventLoop eventLoop) {
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this.eventLoop = eventLoop;
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return this;
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}
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protected ChannelFactory<? extends DatagramChannel> channelFactory() {
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return this.channelFactory;
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}
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/**
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* Sets the {@link ChannelFactory} that will create a {@link DatagramChannel}.
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*
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* @param channelFactory the {@link ChannelFactory}
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* @return {@code this}
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*/
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public DnsNameResolverBuilder channelFactory(ChannelFactory<? extends DatagramChannel> channelFactory) {
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this.channelFactory = channelFactory;
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return this;
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}
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/**
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* Sets the {@link ChannelFactory} as a {@link ReflectiveChannelFactory} of this type.
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* Use as an alternative to {@link #channelFactory(ChannelFactory)}.
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*
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* @param channelType the type
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* @return {@code this}
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*/
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public DnsNameResolverBuilder channelType(Class<? extends DatagramChannel> channelType) {
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return channelFactory(new ReflectiveChannelFactory<DatagramChannel>(channelType));
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}
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/**
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* Sets the {@link ChannelFactory} that will create a {@link SocketChannel} for
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* <a href="https://tools.ietf.org/html/rfc7766">TCP fallback</a> if needed.
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*
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* @param channelFactory the {@link ChannelFactory} or {@code null}
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* if <a href="https://tools.ietf.org/html/rfc7766">TCP fallback</a> should not be supported.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder socketChannelFactory(ChannelFactory<? extends SocketChannel> channelFactory) {
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this.socketChannelFactory = channelFactory;
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return this;
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}
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/**
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* Sets the {@link ChannelFactory} as a {@link ReflectiveChannelFactory} of this type for
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* <a href="https://tools.ietf.org/html/rfc7766">TCP fallback</a> if needed.
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* Use as an alternative to {@link #socketChannelFactory(ChannelFactory)}.
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*
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* @param channelType the type or {@code null} if <a href="https://tools.ietf.org/html/rfc7766">TCP fallback</a>
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* should not be supported.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder socketChannelType(Class<? extends SocketChannel> channelType) {
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if (channelType == null) {
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return socketChannelFactory(null);
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}
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return socketChannelFactory(new ReflectiveChannelFactory<SocketChannel>(channelType));
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}
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/**
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* Sets the cache for resolution results.
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*
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* @param resolveCache the DNS resolution results cache
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* @return {@code this}
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*/
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public DnsNameResolverBuilder resolveCache(DnsCache resolveCache) {
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this.resolveCache = resolveCache;
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return this;
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}
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/**
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* Sets the cache for {@code CNAME} mappings.
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*
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* @param cnameCache the cache used to cache {@code CNAME} mappings for a domain.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder cnameCache(DnsCnameCache cnameCache) {
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this.cnameCache = cnameCache;
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return this;
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}
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/**
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* Set the factory used to generate objects which can observe individual DNS queries.
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* @param lifecycleObserverFactory the factory used to generate objects which can observe individual DNS queries.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder dnsQueryLifecycleObserverFactory(DnsQueryLifecycleObserverFactory
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lifecycleObserverFactory) {
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this.dnsQueryLifecycleObserverFactory = checkNotNull(lifecycleObserverFactory, "lifecycleObserverFactory");
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return this;
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}
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/**
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* Sets the cache for authoritative NS servers
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*
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* @param authoritativeDnsServerCache the authoritative NS servers cache
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* @return {@code this}
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* @deprecated Use {@link #authoritativeDnsServerCache(AuthoritativeDnsServerCache)}
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*/
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@Deprecated
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public DnsNameResolverBuilder authoritativeDnsServerCache(DnsCache authoritativeDnsServerCache) {
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this.authoritativeDnsServerCache = new AuthoritativeDnsServerCacheAdapter(authoritativeDnsServerCache);
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return this;
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}
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/**
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* Sets the cache for authoritative NS servers
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*
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* @param authoritativeDnsServerCache the authoritative NS servers cache
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* @return {@code this}
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*/
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public DnsNameResolverBuilder authoritativeDnsServerCache(AuthoritativeDnsServerCache authoritativeDnsServerCache) {
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this.authoritativeDnsServerCache = authoritativeDnsServerCache;
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return this;
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}
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/**
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* Sets the minimum and maximum TTL of the cached DNS resource records (in seconds). If the TTL of the DNS
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* resource record returned by the DNS server is less than the minimum TTL or greater than the maximum TTL,
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* this resolver will ignore the TTL from the DNS server and use the minimum TTL or the maximum TTL instead
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* respectively.
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* The default value is {@code 0} and {@link Integer#MAX_VALUE}, which practically tells this resolver to
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* respect the TTL from the DNS server.
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*
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* @param minTtl the minimum TTL
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* @param maxTtl the maximum TTL
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* @return {@code this}
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*/
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public DnsNameResolverBuilder ttl(int minTtl, int maxTtl) {
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this.maxTtl = maxTtl;
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this.minTtl = minTtl;
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return this;
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}
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/**
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* Sets the TTL of the cache for the failed DNS queries (in seconds).
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*
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* @param negativeTtl the TTL for failed cached queries
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* @return {@code this}
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*/
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public DnsNameResolverBuilder negativeTtl(int negativeTtl) {
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this.negativeTtl = negativeTtl;
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return this;
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}
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/**
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* Sets the timeout of each DNS query performed by this resolver (in milliseconds).
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*
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* @param queryTimeoutMillis the query timeout
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* @return {@code this}
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*/
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public DnsNameResolverBuilder queryTimeoutMillis(long queryTimeoutMillis) {
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this.queryTimeoutMillis = queryTimeoutMillis;
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return this;
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}
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/**
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* Compute a {@link ResolvedAddressTypes} from some {@link InternetProtocolFamily}s.
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* An empty input will return the default value, based on "java.net" System properties.
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* Valid inputs are (), (IPv4), (IPv6), (Ipv4, IPv6) and (IPv6, IPv4).
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* @param internetProtocolFamilies a valid sequence of {@link InternetProtocolFamily}s
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* @return a {@link ResolvedAddressTypes}
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*/
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public static ResolvedAddressTypes computeResolvedAddressTypes(InternetProtocolFamily... internetProtocolFamilies) {
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if (internetProtocolFamilies == null || internetProtocolFamilies.length == 0) {
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return DnsNameResolver.DEFAULT_RESOLVE_ADDRESS_TYPES;
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}
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if (internetProtocolFamilies.length > 2) {
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throw new IllegalArgumentException("No more than 2 InternetProtocolFamilies");
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}
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switch(internetProtocolFamilies[0]) {
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case IPv4:
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return (internetProtocolFamilies.length >= 2
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&& internetProtocolFamilies[1] == InternetProtocolFamily.IPv6) ?
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ResolvedAddressTypes.IPV4_PREFERRED: ResolvedAddressTypes.IPV4_ONLY;
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case IPv6:
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return (internetProtocolFamilies.length >= 2
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&& internetProtocolFamilies[1] == InternetProtocolFamily.IPv4) ?
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ResolvedAddressTypes.IPV6_PREFERRED: ResolvedAddressTypes.IPV6_ONLY;
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default:
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throw new IllegalArgumentException(
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"Couldn't resolve ResolvedAddressTypes from InternetProtocolFamily array");
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}
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}
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/**
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* Sets the list of the protocol families of the address resolved.
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* You can use {@link DnsNameResolverBuilder#computeResolvedAddressTypes(InternetProtocolFamily...)}
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* to get a {@link ResolvedAddressTypes} out of some {@link InternetProtocolFamily}s.
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*
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* @param resolvedAddressTypes the address types
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* @return {@code this}
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*/
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public DnsNameResolverBuilder resolvedAddressTypes(ResolvedAddressTypes resolvedAddressTypes) {
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this.resolvedAddressTypes = resolvedAddressTypes;
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return this;
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}
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/**
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* If {@code true} {@link DnsNameResolver#resolveAll(String)} will notify the returned {@link Future} as
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* soon as all queries for the preferred address-type are complete.
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*
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* @param completeOncePreferredResolved {@code true} to enable, {@code false} to disable.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder completeOncePreferredResolved(boolean completeOncePreferredResolved) {
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this.completeOncePreferredResolved = completeOncePreferredResolved;
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return this;
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}
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/**
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* Sets if this resolver has to send a DNS query with the RD (recursion desired) flag set.
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*
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* @param recursionDesired true if recursion is desired
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* @return {@code this}
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*/
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public DnsNameResolverBuilder recursionDesired(boolean recursionDesired) {
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this.recursionDesired = recursionDesired;
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return this;
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}
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/**
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* Sets the maximum allowed number of DNS queries to send when resolving a host name.
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*
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* @param maxQueriesPerResolve the max number of queries
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* @return {@code this}
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*/
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public DnsNameResolverBuilder maxQueriesPerResolve(int maxQueriesPerResolve) {
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this.maxQueriesPerResolve = maxQueriesPerResolve;
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return this;
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}
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/**
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* Sets if this resolver should generate the detailed trace information in an exception message so that
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* it is easier to understand the cause of resolution failure.
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*
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* @param traceEnabled true if trace is enabled
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* @return {@code this}
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*/
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public DnsNameResolverBuilder traceEnabled(boolean traceEnabled) {
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this.traceEnabled = traceEnabled;
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return this;
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}
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/**
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* Sets the capacity of the datagram packet buffer (in bytes). The default value is {@code 4096} bytes.
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*
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* @param maxPayloadSize the capacity of the datagram packet buffer
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* @return {@code this}
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*/
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public DnsNameResolverBuilder maxPayloadSize(int maxPayloadSize) {
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this.maxPayloadSize = maxPayloadSize;
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return this;
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}
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/**
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* Enable the automatic inclusion of a optional records that tries to give the remote DNS server a hint about
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* how much data the resolver can read per response. Some DNSServer may not support this and so fail to answer
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* queries. If you find problems you may want to disable this.
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*
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* @param optResourceEnabled if optional records inclusion is enabled
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* @return {@code this}
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*/
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public DnsNameResolverBuilder optResourceEnabled(boolean optResourceEnabled) {
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this.optResourceEnabled = optResourceEnabled;
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return this;
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}
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/**
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* @param hostsFileEntriesResolver the {@link HostsFileEntriesResolver} used to first check
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* if the hostname is locally aliased.
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* @return {@code this}
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*/
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public DnsNameResolverBuilder hostsFileEntriesResolver(HostsFileEntriesResolver hostsFileEntriesResolver) {
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this.hostsFileEntriesResolver = hostsFileEntriesResolver;
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return this;
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}
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protected DnsServerAddressStreamProvider nameServerProvider() {
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return this.dnsServerAddressStreamProvider;
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}
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/**
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* Set the {@link DnsServerAddressStreamProvider} which is used to determine which DNS server is used to resolve
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* each hostname.
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* @return {@code this}.
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*/
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public DnsNameResolverBuilder nameServerProvider(DnsServerAddressStreamProvider dnsServerAddressStreamProvider) {
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this.dnsServerAddressStreamProvider =
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checkNotNull(dnsServerAddressStreamProvider, "dnsServerAddressStreamProvider");
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return this;
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}
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/**
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* Set the list of search domains of the resolver.
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*
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* @param searchDomains the search domains
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* @return {@code this}
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*/
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public DnsNameResolverBuilder searchDomains(Iterable<String> searchDomains) {
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checkNotNull(searchDomains, "searchDomains");
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final List<String> list = new ArrayList<String>(4);
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for (String f : searchDomains) {
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if (f == null) {
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break;
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}
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// Avoid duplicate entries.
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if (list.contains(f)) {
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continue;
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}
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list.add(f);
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}
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this.searchDomains = list.toArray(new String[0]);
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return this;
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}
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/**
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* Set the number of dots which must appear in a name before an initial absolute query is made.
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* The default value is {@code 1}.
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*
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* @param ndots the ndots value
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* @return {@code this}
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*/
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public DnsNameResolverBuilder ndots(int ndots) {
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this.ndots = ndots;
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return this;
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}
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private DnsCache newCache() {
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return new DefaultDnsCache(intValue(minTtl, 0), intValue(maxTtl, Integer.MAX_VALUE), intValue(negativeTtl, 0));
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}
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private AuthoritativeDnsServerCache newAuthoritativeDnsServerCache() {
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return new DefaultAuthoritativeDnsServerCache(
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intValue(minTtl, 0), intValue(maxTtl, Integer.MAX_VALUE),
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// Let us use the sane ordering as DnsNameResolver will be used when returning
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// nameservers from the cache.
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new NameServerComparator(DnsNameResolver.preferredAddressType(resolvedAddressTypes).addressType()));
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}
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private DnsCnameCache newCnameCache() {
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return new DefaultDnsCnameCache(
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intValue(minTtl, 0), intValue(maxTtl, Integer.MAX_VALUE));
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}
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/**
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* Set if domain / host names should be decoded to unicode when received.
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* See <a href="https://tools.ietf.org/html/rfc3492">rfc3492</a>.
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*
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* @param decodeIdn if should get decoded
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* @return {@code this}
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*/
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public DnsNameResolverBuilder decodeIdn(boolean decodeIdn) {
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this.decodeIdn = decodeIdn;
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return this;
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}
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/**
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* Returns a new {@link DnsNameResolver} instance.
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*
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* @return a {@link DnsNameResolver}
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*/
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public DnsNameResolver build() {
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if (eventLoop == null) {
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throw new IllegalStateException("eventLoop should be specified to build a DnsNameResolver.");
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}
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if (resolveCache != null && (minTtl != null || maxTtl != null || negativeTtl != null)) {
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throw new IllegalStateException("resolveCache and TTLs are mutually exclusive");
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}
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if (authoritativeDnsServerCache != null && (minTtl != null || maxTtl != null || negativeTtl != null)) {
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throw new IllegalStateException("authoritativeDnsServerCache and TTLs are mutually exclusive");
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}
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DnsCache resolveCache = this.resolveCache != null ? this.resolveCache : newCache();
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DnsCnameCache cnameCache = this.cnameCache != null ? this.cnameCache : newCnameCache();
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AuthoritativeDnsServerCache authoritativeDnsServerCache = this.authoritativeDnsServerCache != null ?
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this.authoritativeDnsServerCache : newAuthoritativeDnsServerCache();
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return new DnsNameResolver(
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eventLoop,
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channelFactory,
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socketChannelFactory,
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resolveCache,
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cnameCache,
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authoritativeDnsServerCache,
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dnsQueryLifecycleObserverFactory,
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queryTimeoutMillis,
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resolvedAddressTypes,
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recursionDesired,
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maxQueriesPerResolve,
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traceEnabled,
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maxPayloadSize,
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optResourceEnabled,
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hostsFileEntriesResolver,
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dnsServerAddressStreamProvider,
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searchDomains,
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ndots,
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decodeIdn,
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completeOncePreferredResolved);
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}
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/**
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* Creates a copy of this {@link DnsNameResolverBuilder}
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*
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* @return {@link DnsNameResolverBuilder}
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*/
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public DnsNameResolverBuilder copy() {
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DnsNameResolverBuilder copiedBuilder = new DnsNameResolverBuilder();
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if (eventLoop != null) {
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copiedBuilder.eventLoop(eventLoop);
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}
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if (channelFactory != null) {
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copiedBuilder.channelFactory(channelFactory);
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}
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if (socketChannelFactory != null) {
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copiedBuilder.socketChannelFactory(socketChannelFactory);
|
|
}
|
|
|
|
if (resolveCache != null) {
|
|
copiedBuilder.resolveCache(resolveCache);
|
|
}
|
|
|
|
if (cnameCache != null) {
|
|
copiedBuilder.cnameCache(cnameCache);
|
|
}
|
|
if (maxTtl != null && minTtl != null) {
|
|
copiedBuilder.ttl(minTtl, maxTtl);
|
|
}
|
|
|
|
if (negativeTtl != null) {
|
|
copiedBuilder.negativeTtl(negativeTtl);
|
|
}
|
|
|
|
if (authoritativeDnsServerCache != null) {
|
|
copiedBuilder.authoritativeDnsServerCache(authoritativeDnsServerCache);
|
|
}
|
|
|
|
if (dnsQueryLifecycleObserverFactory != null) {
|
|
copiedBuilder.dnsQueryLifecycleObserverFactory(dnsQueryLifecycleObserverFactory);
|
|
}
|
|
|
|
copiedBuilder.queryTimeoutMillis(queryTimeoutMillis);
|
|
copiedBuilder.resolvedAddressTypes(resolvedAddressTypes);
|
|
copiedBuilder.recursionDesired(recursionDesired);
|
|
copiedBuilder.maxQueriesPerResolve(maxQueriesPerResolve);
|
|
copiedBuilder.traceEnabled(traceEnabled);
|
|
copiedBuilder.maxPayloadSize(maxPayloadSize);
|
|
copiedBuilder.optResourceEnabled(optResourceEnabled);
|
|
copiedBuilder.hostsFileEntriesResolver(hostsFileEntriesResolver);
|
|
|
|
if (dnsServerAddressStreamProvider != null) {
|
|
copiedBuilder.nameServerProvider(dnsServerAddressStreamProvider);
|
|
}
|
|
|
|
if (searchDomains != null) {
|
|
copiedBuilder.searchDomains(Arrays.asList(searchDomains));
|
|
}
|
|
|
|
copiedBuilder.ndots(ndots);
|
|
copiedBuilder.decodeIdn(decodeIdn);
|
|
copiedBuilder.completeOncePreferredResolved(completeOncePreferredResolved);
|
|
|
|
return copiedBuilder;
|
|
}
|
|
}
|