676 lines
25 KiB
Java
676 lines
25 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.buffer.ByteBuf;
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import io.netty.buffer.ByteBufHolder;
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import io.netty.channel.AddressedEnvelope;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.InternetProtocolFamily;
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import io.netty.channel.socket.nio.NioDatagramChannel;
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import io.netty.handler.codec.dns.DefaultDnsQuestion;
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import io.netty.handler.codec.dns.DnsRecord;
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import io.netty.handler.codec.dns.DnsRecordType;
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import io.netty.handler.codec.dns.DnsResponse;
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import io.netty.handler.codec.dns.DnsResponseCode;
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import io.netty.handler.codec.dns.DnsSection;
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import io.netty.util.NetUtil;
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import io.netty.util.concurrent.Future;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.ThreadLocalRandom;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import org.apache.directory.server.dns.DnsServer;
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import org.apache.directory.server.dns.io.encoder.DnsMessageEncoder;
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import org.apache.directory.server.dns.io.encoder.ResourceRecordEncoder;
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import org.apache.directory.server.dns.messages.DnsMessage;
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import org.apache.directory.server.dns.messages.QuestionRecord;
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import org.apache.directory.server.dns.messages.RecordClass;
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import org.apache.directory.server.dns.messages.RecordType;
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import org.apache.directory.server.dns.messages.ResourceRecord;
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import org.apache.directory.server.dns.messages.ResourceRecordModifier;
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import org.apache.directory.server.dns.protocol.DnsProtocolHandler;
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import org.apache.directory.server.dns.protocol.DnsUdpDecoder;
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import org.apache.directory.server.dns.protocol.DnsUdpEncoder;
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import org.apache.directory.server.dns.store.DnsAttribute;
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import org.apache.directory.server.dns.store.RecordStore;
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import org.apache.directory.server.protocol.shared.transport.UdpTransport;
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import org.apache.mina.core.buffer.IoBuffer;
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import org.apache.mina.core.session.IoSession;
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import org.apache.mina.filter.codec.ProtocolCodecFactory;
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import org.apache.mina.filter.codec.ProtocolCodecFilter;
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import org.apache.mina.filter.codec.ProtocolDecoder;
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import org.apache.mina.filter.codec.ProtocolEncoder;
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import org.apache.mina.filter.codec.ProtocolEncoderOutput;
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import org.apache.mina.transport.socket.DatagramAcceptor;
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import org.apache.mina.transport.socket.DatagramSessionConfig;
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import org.junit.After;
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import org.junit.AfterClass;
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import org.junit.BeforeClass;
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import org.junit.Test;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import static org.hamcrest.Matchers.greaterThan;
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import static org.hamcrest.Matchers.hasSize;
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import static org.hamcrest.Matchers.instanceOf;
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import static org.hamcrest.Matchers.is;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import static org.junit.Assert.fail;
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public class DnsNameResolverTest {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(DnsNameResolver.class);
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// Using the top-100 web sites ranked in Alexa.com (Oct 2014)
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// Please use the following series of shell commands to get this up-to-date:
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// $ curl -O http://s3.amazonaws.com/alexa-static/top-1m.csv.zip
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// $ unzip -o top-1m.csv.zip top-1m.csv
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// $ head -100 top-1m.csv | cut -d, -f2 | cut -d/ -f1 | while read L; do echo '"'"$L"'",'; done > topsites.txt
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private static final Set<String> DOMAINS = Collections.unmodifiableSet(new HashSet<String>(Arrays.asList(
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"google.com",
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"facebook.com",
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"youtube.com",
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"yahoo.com",
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"baidu.com",
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"wikipedia.org",
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"amazon.com",
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"twitter.com",
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"qq.com",
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"taobao.com",
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"linkedin.com",
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"google.co.in",
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"live.com",
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"hao123.com",
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"sina.com.cn",
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"blogspot.com",
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"weibo.com",
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"yahoo.co.jp",
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"tmall.com",
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"yandex.ru",
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"sohu.com",
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"bing.com",
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"ebay.com",
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"pinterest.com",
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"vk.com",
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"google.de",
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"wordpress.com",
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"apple.com",
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"google.co.jp",
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"google.co.uk",
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"360.cn",
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"instagram.com",
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"google.fr",
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"msn.com",
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"ask.com",
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"soso.com",
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"google.com.br",
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"tumblr.com",
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"paypal.com",
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"mail.ru",
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"xvideos.com",
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"microsoft.com",
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"google.ru",
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"reddit.com",
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"google.it",
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"imgur.com",
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"163.com",
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"google.es",
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"imdb.com",
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"aliexpress.com",
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"t.co",
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"go.com",
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"adcash.com",
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"craigslist.org",
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"amazon.co.jp",
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"alibaba.com",
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"google.com.mx",
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"stackoverflow.com",
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"xhamster.com",
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"fc2.com",
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"google.ca",
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"bbc.co.uk",
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"espn.go.com",
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"cnn.com",
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"google.co.id",
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"people.com.cn",
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"gmw.cn",
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"pornhub.com",
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"blogger.com",
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"huffingtonpost.com",
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"flipkart.com",
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"akamaihd.net",
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"google.com.tr",
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"amazon.de",
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"netflix.com",
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"onclickads.net",
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"googleusercontent.com",
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"kickass.to",
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"google.com.au",
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"google.pl",
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"xinhuanet.com",
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"ebay.de",
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"wordpress.org",
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"odnoklassniki.ru",
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"google.com.hk",
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"adobe.com",
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"dailymotion.com",
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"dailymail.co.uk",
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"indiatimes.com",
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"amazon.co.uk",
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"xnxx.com",
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"rakuten.co.jp",
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"dropbox.com",
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"tudou.com",
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"about.com",
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"cnet.com",
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"vimeo.com",
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"redtube.com",
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"blogspot.in")));
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/**
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* The list of the domain names to exclude from {@link #testResolveAorAAAA()}.
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*/
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private static final Set<String> EXCLUSIONS_RESOLVE_A = new HashSet<String>();
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static {
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Collections.addAll(
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EXCLUSIONS_RESOLVE_A,
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"akamaihd.net",
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"googleusercontent.com",
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StringUtil.EMPTY_STRING);
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}
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/**
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* The list of the domain names to exclude from {@link #testResolveAAAA()}.
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* Unfortunately, there are only handful of domain names with IPv6 addresses.
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*/
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private static final Set<String> EXCLUSIONS_RESOLVE_AAAA = new HashSet<String>();
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static {
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EXCLUSIONS_RESOLVE_AAAA.addAll(EXCLUSIONS_RESOLVE_A);
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EXCLUSIONS_RESOLVE_AAAA.addAll(DOMAINS);
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EXCLUSIONS_RESOLVE_AAAA.removeAll(Arrays.asList(
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"google.com",
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"facebook.com",
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"youtube.com",
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"wikipedia.org",
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"google.co.in",
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"blogspot.com",
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"vk.com",
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"google.de",
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"google.co.jp",
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"google.co.uk",
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"google.fr",
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"google.com.br",
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"google.ru",
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"google.it",
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"google.es",
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"google.com.mx",
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"xhamster.com",
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"google.ca",
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"google.co.id",
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"blogger.com",
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"flipkart.com",
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"google.com.tr",
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"google.com.au",
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"google.pl",
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"google.com.hk",
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"blogspot.in"
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));
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}
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/**
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* The list of the domain names to exclude from {@link #testQueryMx()}.
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*/
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private static final Set<String> EXCLUSIONS_QUERY_MX = new HashSet<String>();
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static {
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Collections.addAll(
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EXCLUSIONS_QUERY_MX,
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"hao123.com",
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"blogspot.com",
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"t.co",
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"espn.go.com",
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"people.com.cn",
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"googleusercontent.com",
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"blogspot.in",
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StringUtil.EMPTY_STRING);
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}
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private static final TestDnsServer dnsServer = new TestDnsServer();
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private static final EventLoopGroup group = new NioEventLoopGroup(1);
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private static DnsNameResolver resolver;
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@BeforeClass
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public static void init() throws Exception {
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dnsServer.start();
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resolver = new DnsNameResolver(group.next(), NioDatagramChannel.class,
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DnsServerAddresses.singleton(dnsServer.localAddress()));
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resolver.setMaxQueriesPerResolve(1);
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resolver.setOptResourceEnabled(false);
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}
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@AfterClass
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public static void destroy() {
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dnsServer.stop();
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group.shutdownGracefully();
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}
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@After
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public void reset() throws Exception {
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resolver.clearCache();
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}
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@Test
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public void testResolveAorAAAA() throws Exception {
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testResolve0(EXCLUSIONS_RESOLVE_A, InternetProtocolFamily.IPv4, InternetProtocolFamily.IPv6);
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}
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@Test
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public void testResolveAAAAorA() throws Exception {
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testResolve0(EXCLUSIONS_RESOLVE_A, InternetProtocolFamily.IPv6, InternetProtocolFamily.IPv4);
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}
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@Test
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public void testResolveA() throws Exception {
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final int oldMinTtl = resolver.minTtl();
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final int oldMaxTtl = resolver.maxTtl();
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// Cache for eternity.
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resolver.setTtl(Integer.MAX_VALUE, Integer.MAX_VALUE);
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try {
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final Map<String, InetAddress> resultA = testResolve0(EXCLUSIONS_RESOLVE_A, InternetProtocolFamily.IPv4);
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// Now, try to resolve again to see if it's cached.
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// This test works because the DNS servers usually randomizes the order of the records in a response.
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// If cached, the resolved addresses must be always same, because we reuse the same response.
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final Map<String, InetAddress> resultB = testResolve0(EXCLUSIONS_RESOLVE_A, InternetProtocolFamily.IPv4);
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// Ensure the result from the cache is identical from the uncached one.
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assertThat(resultB.size(), is(resultA.size()));
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for (Entry<String, InetAddress> e: resultA.entrySet()) {
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InetAddress expected = e.getValue();
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InetAddress actual = resultB.get(e.getKey());
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if (!actual.equals(expected)) {
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// Print the content of the cache when test failure is expected.
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System.err.println("Cache for " + e.getKey() + ": " + resolver.resolveAll(e.getKey()).getNow());
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}
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assertThat(actual, is(expected));
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}
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} finally {
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// Restore the TTL configuration.
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resolver.setTtl(oldMinTtl, oldMaxTtl);
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}
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}
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@Test
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public void testResolveAAAA() throws Exception {
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testResolve0(EXCLUSIONS_RESOLVE_AAAA, InternetProtocolFamily.IPv6);
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}
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private static Map<String, InetAddress> testResolve0(
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Set<String> excludedDomains, InternetProtocolFamily... famililies) throws InterruptedException {
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final List<InternetProtocolFamily> oldResolveAddressTypes = resolver.resolveAddressTypes();
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assertThat(resolver.isRecursionDesired(), is(true));
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assertThat(oldResolveAddressTypes.size(), is(InternetProtocolFamily.values().length));
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resolver.setResolveAddressTypes(famililies);
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final Map<String, InetAddress> results = new HashMap<String, InetAddress>();
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try {
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final Map<String, Future<InetAddress>> futures =
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new LinkedHashMap<String, Future<InetAddress>>();
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for (String name : DOMAINS) {
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if (excludedDomains.contains(name)) {
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continue;
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}
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resolve(futures, name);
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}
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for (Entry<String, Future<InetAddress>> e : futures.entrySet()) {
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String unresolved = e.getKey();
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InetAddress resolved = e.getValue().sync().getNow();
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logger.info("{}: {}", unresolved, resolved.getHostAddress());
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assertThat(resolved.getHostName(), is(unresolved));
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boolean typeMatches = false;
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for (InternetProtocolFamily f: famililies) {
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Class<?> resolvedType = resolved.getClass();
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if (f.addressType().isAssignableFrom(resolvedType)) {
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typeMatches = true;
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}
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}
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assertThat(typeMatches, is(true));
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results.put(resolved.getHostName(), resolved);
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}
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} finally {
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resolver.setResolveAddressTypes(oldResolveAddressTypes);
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}
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return results;
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}
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@Test
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public void testQueryMx() throws Exception {
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assertThat(resolver.isRecursionDesired(), is(true));
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Map<String, Future<AddressedEnvelope<DnsResponse, InetSocketAddress>>> futures =
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new LinkedHashMap<String, Future<AddressedEnvelope<DnsResponse, InetSocketAddress>>>();
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for (String name: DOMAINS) {
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if (EXCLUSIONS_QUERY_MX.contains(name)) {
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continue;
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}
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queryMx(futures, name);
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}
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for (Entry<String, Future<AddressedEnvelope<DnsResponse, InetSocketAddress>>> e: futures.entrySet()) {
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String hostname = e.getKey();
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Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> f = e.getValue().awaitUninterruptibly();
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DnsResponse response = f.getNow().content();
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assertThat(response.code(), is(DnsResponseCode.NOERROR));
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final int answerCount = response.count(DnsSection.ANSWER);
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final List<DnsRecord> mxList = new ArrayList<DnsRecord>(answerCount);
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for (int i = 0; i < answerCount; i ++) {
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final DnsRecord r = response.recordAt(DnsSection.ANSWER, i);
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if (r.type() == DnsRecordType.MX) {
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mxList.add(r);
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}
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}
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assertThat(mxList.size(), is(greaterThan(0)));
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StringBuilder buf = new StringBuilder();
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for (DnsRecord r: mxList) {
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ByteBuf recordContent = ((ByteBufHolder) r).content();
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buf.append(StringUtil.NEWLINE);
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buf.append('\t');
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buf.append(r.name());
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buf.append(' ');
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buf.append(r.type().name());
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buf.append(' ');
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buf.append(recordContent.readUnsignedShort());
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buf.append(' ');
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buf.append(DnsNameResolverContext.decodeDomainName(recordContent));
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}
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logger.info("{} has the following MX records:{}", hostname, buf);
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response.release();
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}
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}
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@Test
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public void testNegativeTtl() throws Exception {
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final int oldNegativeTtl = resolver.negativeTtl();
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resolver.setNegativeTtl(10);
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try {
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resolveNonExistentDomain();
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final int size = 10000;
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final List<UnknownHostException> exceptions = new ArrayList<UnknownHostException>();
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// If negative cache works, this thread should be done really quickly.
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final Thread negativeLookupThread = new Thread() {
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@Override
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public void run() {
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for (int i = 0; i < size; i++) {
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exceptions.add(resolveNonExistentDomain());
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if (isInterrupted()) {
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break;
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}
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}
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}
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};
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negativeLookupThread.start();
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negativeLookupThread.join(5000);
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if (negativeLookupThread.isAlive()) {
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negativeLookupThread.interrupt();
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fail("Cached negative lookups did not finish quickly.");
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}
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assertThat(exceptions, hasSize(size));
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} finally {
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resolver.setNegativeTtl(oldNegativeTtl);
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}
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}
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private static UnknownHostException resolveNonExistentDomain() {
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try {
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resolver.resolve("non-existent.netty.io").sync();
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fail();
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return null;
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} catch (Exception e) {
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assertThat(e, is(instanceOf(UnknownHostException.class)));
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return (UnknownHostException) e;
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}
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}
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@Test
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public void testResolveIp() {
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InetAddress address = resolver.resolve("10.0.0.1").syncUninterruptibly().getNow();
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assertEquals("10.0.0.1", address.getHostName());
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}
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private static void resolve(Map<String, Future<InetAddress>> futures, String hostname) {
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futures.put(hostname, resolver.resolve(hostname));
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}
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private static void queryMx(
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Map<String, Future<AddressedEnvelope<DnsResponse, InetSocketAddress>>> futures,
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String hostname) throws Exception {
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futures.put(hostname, resolver.query(new DefaultDnsQuestion(hostname, DnsRecordType.MX)));
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}
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|
|
|
private static final class TestDnsServer extends DnsServer {
|
|
private static final Map<String, byte[]> BYTES = new HashMap<String, byte[]>();
|
|
private static final String[] IPV6_ADDRESSES;
|
|
static {
|
|
BYTES.put("::1", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1});
|
|
BYTES.put("0:0:0:0:0:0:1:1", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1});
|
|
BYTES.put("0:0:0:0:0:1:1:1", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1});
|
|
BYTES.put("0:0:0:0:1:1:1:1", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1});
|
|
BYTES.put("0:0:0:1:1:1:1:1", new byte[] {0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1});
|
|
BYTES.put("0:0:1:1:1:1:1:1", new byte[] {0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1});
|
|
BYTES.put("0:1:1:1:1:1:1:1", new byte[] {0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1});
|
|
BYTES.put("1:1:1:1:1:1:1:1", new byte[] {0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1});
|
|
|
|
IPV6_ADDRESSES = BYTES.keySet().toArray(new String[BYTES.size()]);
|
|
}
|
|
|
|
@Override
|
|
public void start() throws IOException {
|
|
InetSocketAddress address = new InetSocketAddress(NetUtil.LOCALHOST4, 0);
|
|
UdpTransport transport = new UdpTransport(address.getHostName(), address.getPort());
|
|
setTransports(transport);
|
|
|
|
DatagramAcceptor acceptor = transport.getAcceptor();
|
|
|
|
acceptor.setHandler(new DnsProtocolHandler(this, new TestRecordStore()) {
|
|
@Override
|
|
public void sessionCreated(IoSession session) throws Exception {
|
|
// USe our own codec to support AAAA testing
|
|
session.getFilterChain()
|
|
.addFirst("codec", new ProtocolCodecFilter(new TestDnsProtocolUdpCodecFactory()));
|
|
}
|
|
});
|
|
|
|
((DatagramSessionConfig) acceptor.getSessionConfig()).setReuseAddress(true);
|
|
|
|
// Start the listener
|
|
acceptor.bind();
|
|
}
|
|
|
|
public InetSocketAddress localAddress() {
|
|
return (InetSocketAddress) getTransports()[0].getAcceptor().getLocalAddress();
|
|
}
|
|
|
|
/**
|
|
* {@link ProtocolCodecFactory} which allows to test AAAA resolution.
|
|
*/
|
|
private static final class TestDnsProtocolUdpCodecFactory implements ProtocolCodecFactory {
|
|
private final DnsMessageEncoder encoder = new DnsMessageEncoder();
|
|
private final TestAAAARecordEncoder recordEncoder = new TestAAAARecordEncoder();
|
|
|
|
@Override
|
|
public ProtocolEncoder getEncoder(IoSession session) throws Exception {
|
|
return new DnsUdpEncoder() {
|
|
|
|
@Override
|
|
public void encode(IoSession session, Object message, ProtocolEncoderOutput out) {
|
|
IoBuffer buf = IoBuffer.allocate(1024);
|
|
DnsMessage dnsMessage = (DnsMessage) message;
|
|
encoder.encode(buf, dnsMessage);
|
|
for (ResourceRecord record: dnsMessage.getAnswerRecords()) {
|
|
// This is a hack to allow to also test for AAAA resolution as DnsMessageEncoder
|
|
// does not support it and it is hard to extend, because the interesting methods
|
|
// are private...
|
|
// In case of RecordType.AAAA we need to encode the RecordType by ourself.
|
|
if (record.getRecordType() == RecordType.AAAA) {
|
|
try {
|
|
recordEncoder.put(buf, record);
|
|
} catch (IOException e) {
|
|
// Should never happen
|
|
throw new IllegalStateException(e);
|
|
}
|
|
}
|
|
}
|
|
buf.flip();
|
|
|
|
out.write(buf);
|
|
}
|
|
};
|
|
}
|
|
|
|
@Override
|
|
public ProtocolDecoder getDecoder(IoSession session) throws Exception {
|
|
return new DnsUdpDecoder();
|
|
}
|
|
|
|
private static final class TestAAAARecordEncoder extends ResourceRecordEncoder {
|
|
|
|
@Override
|
|
protected void putResourceRecordData(IoBuffer ioBuffer, ResourceRecord resourceRecord) {
|
|
byte[] bytes = BYTES.get(resourceRecord.get(DnsAttribute.IP_ADDRESS));
|
|
if (bytes == null) {
|
|
throw new IllegalStateException();
|
|
}
|
|
// encode the ::1
|
|
ioBuffer.put(bytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static final class TestRecordStore implements RecordStore {
|
|
private static final int[] NUMBERS = new int[254];
|
|
private static final char[] CHARS = new char[26];
|
|
|
|
static {
|
|
for (int i = 0; i < NUMBERS.length; i++) {
|
|
NUMBERS[i] = i + 1;
|
|
}
|
|
|
|
for (int i = 0; i < CHARS.length; i++) {
|
|
CHARS[i] = (char) ('a' + i);
|
|
}
|
|
}
|
|
|
|
private static int index(int arrayLength) {
|
|
return Math.abs(ThreadLocalRandom.current().nextInt()) % arrayLength;
|
|
}
|
|
|
|
private static String nextDomain() {
|
|
return CHARS[index(CHARS.length)] + ".netty.io";
|
|
}
|
|
|
|
private static String nextIp() {
|
|
return ippart() + "." + ippart() + '.' + ippart() + '.' + ippart();
|
|
}
|
|
|
|
private static int ippart() {
|
|
return NUMBERS[index(NUMBERS.length)];
|
|
}
|
|
|
|
private static String nextIp6() {
|
|
return IPV6_ADDRESSES[index(IPV6_ADDRESSES.length)];
|
|
}
|
|
|
|
@Override
|
|
public Set<ResourceRecord> getRecords(QuestionRecord questionRecord) {
|
|
String name = questionRecord.getDomainName();
|
|
if (DOMAINS.contains(name)) {
|
|
ResourceRecordModifier rm = new ResourceRecordModifier();
|
|
rm.setDnsClass(RecordClass.IN);
|
|
rm.setDnsName(name);
|
|
rm.setDnsTtl(100);
|
|
rm.setDnsType(questionRecord.getRecordType());
|
|
|
|
switch (questionRecord.getRecordType()) {
|
|
case A:
|
|
do {
|
|
rm.put(DnsAttribute.IP_ADDRESS, nextIp());
|
|
} while (ThreadLocalRandom.current().nextBoolean());
|
|
break;
|
|
case AAAA:
|
|
do {
|
|
rm.put(DnsAttribute.IP_ADDRESS, nextIp6());
|
|
} while (ThreadLocalRandom.current().nextBoolean());
|
|
break;
|
|
case MX:
|
|
int prioritity = 0;
|
|
do {
|
|
rm.put(DnsAttribute.DOMAIN_NAME, nextDomain());
|
|
rm.put(DnsAttribute.MX_PREFERENCE, String.valueOf(++prioritity));
|
|
} while (ThreadLocalRandom.current().nextBoolean());
|
|
break;
|
|
default:
|
|
return null;
|
|
}
|
|
return Collections.singleton(rm.getEntry());
|
|
}
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
}
|