dorkbox/Network
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Added more options to the DnsClient

Browse Source
This commit is contained in:
nathan 2017-10-26 21:00:09 +02:00
parent cf27224fec
commit 124ef3d42c
4 changed files with 1412 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

454
src/dorkbox/network/DnsClient.java
View File

@ -15,6 +15,10 @@
*/
package dorkbox.network;
import static io.netty.resolver.dns.DnsServerAddressStreamProviders.platformDefault;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.ObjectUtil.intValue;
import java.net.IDN;
import java.net.InetAddress;
import java.net.InetSocketAddress;
@ -46,6 +50,7 @@ import dorkbox.util.OS;
import dorkbox.util.Property;
import io.netty.buffer.ByteBuf;
import io.netty.channel.AddressedEnvelope;
import io.netty.channel.ChannelFactory;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.ReflectiveChannelFactory;
import io.netty.channel.epoll.EpollDatagramChannel;
@ -53,6 +58,7 @@ import io.netty.channel.epoll.EpollEventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.oio.OioEventLoopGroup;
import io.netty.channel.socket.DatagramChannel;
import io.netty.channel.socket.InternetProtocolFamily;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.channel.socket.oio.OioDatagramChannel;
import io.netty.handler.codec.dns.DefaultDnsQuestion;
@ -63,19 +69,24 @@ import io.netty.handler.codec.dns.DnsRecordType;
import io.netty.handler.codec.dns.DnsResponse;
import io.netty.handler.codec.dns.DnsResponseCode;
import io.netty.handler.codec.dns.DnsSection;
import io.netty.resolver.HostsFileEntriesResolver;
import io.netty.resolver.ResolvedAddressTypes;
import io.netty.resolver.dns.DefaultDnsCache;
import io.netty.resolver.dns.DefaultDnsServerAddressStreamProvider;
import io.netty.resolver.dns.DnsCache;
import io.netty.resolver.dns.DnsNameResolver;
import io.netty.resolver.dns.DnsNameResolverBuilder;
import io.netty.resolver.dns.DnsNameResolverAccess;
import io.netty.resolver.dns.DnsQueryLifecycleObserverFactory;
import io.netty.resolver.dns.DnsServerAddressStreamProvider;
import io.netty.resolver.dns.NoopDnsQueryLifecycleObserverFactory;
import io.netty.resolver.dns.SequentialDnsServerAddressStreamProvider;
import io.netty.util.concurrent.Future;
import io.netty.util.internal.PlatformDependent;
/**
* for now, we only support ipv4
* A DnsClient for resolving DNS name, with reasonably good defaults.
*/
@SuppressWarnings("unused")
@SuppressWarnings({"unused", "WeakerAccess"})
public
class DnsClient {
@ -83,15 +94,18 @@ class DnsClient {
static {
//noinspection Duplicates
try {
// doesn't work when running from inside eclipse.
// Needed for NIO selectors on Android 2.2, and to force IPv4.
System.setProperty("java.net.preferIPv4Stack", Boolean.TRUE.toString());
System.setProperty("java.net.preferIPv6Addresses", Boolean.FALSE.toString());
if (PlatformDependent.isAndroid()) {
// doesn't work when running from inside eclipse.
// Needed for NIO selectors on Android 2.2, and to force IPv4.
System.setProperty("java.net.preferIPv4Stack", Boolean.TRUE.toString());
System.setProperty("java.net.preferIPv6Addresses", Boolean.FALSE.toString());
}
// java6 has stack overflow problems when loading certain classes in it's classloader. The result is a StackOverflow when
// loading them normally
// loading them normally. This calls AND FIXES this issue.
if (OS.javaVersion == 6) {
if (PlatformDependent.hasUnsafe()) {
//noinspection ResultOfMethodCallIgnored
PlatformDependent.newFixedMpscQueue(8);
}
}
@ -104,7 +118,8 @@ class DnsClient {
*/
// @formatter:off
@Property
public static List<InetSocketAddress> DNS_SERVER_LIST = Arrays.asList(
public static
List<InetSocketAddress> DNS_SERVER_LIST = Arrays.asList(
new InetSocketAddress("8.8.8.8", 53), // Google Public DNS
new InetSocketAddress("8.8.4.4", 53),
new InetSocketAddress("208.67.222.222", 53), // OpenDNS
@ -151,13 +166,51 @@ class DnsClient {
}
private final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(getClass());
private final DnsNameResolver resolver;
private Class<? extends DatagramChannel> channelType;
private DnsNameResolver resolver;
private final Map<DnsRecordType, RecordDecoder<?>> customDecoders = new HashMap<DnsRecordType, RecordDecoder<?>>();
private ThreadGroup threadGroup;
public static final String THREAD_NAME = "DnsClient";
private static final String THREAD_NAME = "DnsClient";
private EventLoopGroup eventLoopGroup;
private ChannelFactory<? extends DatagramChannel> channelFactory;
private DnsCache resolveCache;
private DnsCache authoritativeDnsServerCache;
private Integer minTtl;
private Integer maxTtl;
private Integer negativeTtl;
private long queryTimeoutMillis = 5000;
private ResolvedAddressTypes resolvedAddressTypes = DnsNameResolverAccess.getDefaultResolvedAddressTypes();
private boolean recursionDesired = true;
private int maxQueriesPerResolve = 16;
private boolean traceEnabled;
private int maxPayloadSize = 4096;
private boolean optResourceEnabled = true;
private HostsFileEntriesResolver hostsFileEntriesResolver = HostsFileEntriesResolver.DEFAULT;
private DnsServerAddressStreamProvider dnsServerAddressStreamProvider = platformDefault();
private DnsQueryLifecycleObserverFactory dnsQueryLifecycleObserverFactory = NoopDnsQueryLifecycleObserverFactory.INSTANCE;
private String[] searchDomains;
private int ndots = -1;
private boolean decodeIdn = true;
/**
* Creates a new DNS client, with default name server addresses.
*/
public
DnsClient() {
this(DnsClient.DNS_SERVER_LIST);
}
/**
* Creates a new DNS client, using the provided server (default port 53) for DNS query resolution, with a cache that will obey the TTL of the response
*
@ -178,16 +231,6 @@ class DnsClient {
this(Collections.singletonList(nameServerAddresses));
}
/**
* Creates a new DNS client, with a cache that will obey the TTL of the response
*
* @param nameServerAddresses the list of servers to receive your DNS questions, until it succeeds
*/
public
DnsClient(Collection<InetSocketAddress> nameServerAddresses) {
this(nameServerAddresses, 0, Integer.MAX_VALUE);
}
/**
* Creates a new DNS client.
*
@ -195,13 +238,9 @@ class DnsClient {
* respect the TTL from the DNS server.
*
* @param nameServerAddresses the list of servers to receive your DNS questions, until it succeeds
* @param minTtl the minimum TTL
* @param maxTtl the maximum TTL
*/
public
DnsClient(Collection<InetSocketAddress> nameServerAddresses, int minTtl, int maxTtl) {
Class<? extends DatagramChannel> channelType;
DnsClient(Collection<InetSocketAddress> nameServerAddresses) {
// setup the thread group to easily ID what the following threads belong to (and their spawned threads...)
SecurityManager s = System.getSecurityManager();
threadGroup = new ThreadGroup(s != null
@ -225,20 +264,7 @@ class DnsClient {
channelType = NioDatagramChannel.class;
}
List<DnsServerAddressStreamProvider> list = new ArrayList<DnsServerAddressStreamProvider>(nameServerAddresses.size());
DnsNameResolverBuilder builder = new DnsNameResolverBuilder(eventLoopGroup.next());
builder.channelFactory(new ReflectiveChannelFactory<DatagramChannel>(channelType))
.channelType(channelType)
.ttl(minTtl, maxTtl)
.resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY) // for now, we only support ipv4
.nameServerProvider(new SequentialDnsServerAddressStreamProvider(nameServerAddresses));
resolver = builder.build();
// A/AAAA use the built-in decoder
// NOTE: A/AAAA use the built-in decoder
customDecoders.put(DnsRecordType.MX, new MailExchangerDecoder());
customDecoders.put(DnsRecordType.TXT, new TextDecoder());
@ -249,6 +275,330 @@ class DnsClient {
customDecoders.put(DnsRecordType.CNAME, decoder);
customDecoders.put(DnsRecordType.PTR, decoder);
customDecoders.put(DnsRecordType.SOA, new StartOfAuthorityDecoder());
if (nameServerAddresses != null) {
this.dnsServerAddressStreamProvider = new SequentialDnsServerAddressStreamProvider(nameServerAddresses);
}
}
/**
* Sets the cache for resolution results.
*
* @param resolveCache the DNS resolution results cache
*
* @return {@code this}
*/
public
DnsClient resolveCache(DnsCache resolveCache) {
this.resolveCache = resolveCache;
return this;
}
/**
* Set the factory used to generate objects which can observe individual DNS queries.
*
* @param lifecycleObserverFactory the factory used to generate objects which can observe individual DNS queries.
*
* @return {@code this}
*/
public
DnsClient dnsQueryLifecycleObserverFactory(DnsQueryLifecycleObserverFactory lifecycleObserverFactory) {
this.dnsQueryLifecycleObserverFactory = checkNotNull(lifecycleObserverFactory, "lifecycleObserverFactory");
return this;
}
/**
* Sets the cache for authoritative NS servers
*
* @param authoritativeDnsServerCache the authoritative NS servers cache
*
* @return {@code this}
*/
public
DnsClient authoritativeDnsServerCache(DnsCache authoritativeDnsServerCache) {
this.authoritativeDnsServerCache = authoritativeDnsServerCache;
return this;
}
/**
* Sets the minimum and maximum TTL of the cached DNS resource records (in seconds). If the TTL of the DNS
* resource record returned by the DNS server is less than the minimum TTL or greater than the maximum TTL,
* this resolver will ignore the TTL from the DNS server and use the minimum TTL or the maximum TTL instead
* respectively.
* The default value is {@code 0} and {@link Integer#MAX_VALUE}, which practically tells this resolver to
* respect the TTL from the DNS server.
*
* @param minTtl the minimum TTL
* @param maxTtl the maximum TTL
*
* @return {@code this}
*/
public
DnsClient ttl(int minTtl, int maxTtl) {
this.maxTtl = maxTtl;
this.minTtl = minTtl;
return this;
}
/**
* Sets the TTL of the cache for the failed DNS queries (in seconds).
*
* @param negativeTtl the TTL for failed cached queries
*
* @return {@code this}
*/
public
DnsClient negativeTtl(int negativeTtl) {
this.negativeTtl = negativeTtl;
return this;
}
/**
* Sets the timeout of each DNS query performed by this resolver (in milliseconds).
*
* @param queryTimeoutMillis the query timeout
*
* @return {@code this}
*/
public
DnsClient queryTimeoutMillis(long queryTimeoutMillis) {
this.queryTimeoutMillis = queryTimeoutMillis;
return this;
}
/**
* Sets the list of the protocol families of the address resolved.
* You can use {@link DnsClient#computeResolvedAddressTypes(InternetProtocolFamily...)}
* to get a {@link ResolvedAddressTypes} out of some {@link InternetProtocolFamily}s.
*
* @param resolvedAddressTypes the address types
*
* @return {@code this}
*/
public
DnsClient resolvedAddressTypes(ResolvedAddressTypes resolvedAddressTypes) {
this.resolvedAddressTypes = resolvedAddressTypes;
return this;
}
/**
* Sets if this resolver has to send a DNS query with the RD (recursion desired) flag set.
*
* @param recursionDesired true if recursion is desired
*
* @return {@code this}
*/
public
DnsClient recursionDesired(boolean recursionDesired) {
this.recursionDesired = recursionDesired;
return this;
}
/**
* Sets the maximum allowed number of DNS queries to send when resolving a host name.
*
* @param maxQueriesPerResolve the max number of queries
*
* @return {@code this}
*/
public
DnsClient maxQueriesPerResolve(int maxQueriesPerResolve) {
this.maxQueriesPerResolve = maxQueriesPerResolve;
return this;
}
/**
* Sets if this resolver should generate the detailed trace information in an exception message so that
* it is easier to understand the cause of resolution failure.
*
* @param traceEnabled true if trace is enabled
*
* @return {@code this}
*/
public
DnsClient traceEnabled(boolean traceEnabled) {
this.traceEnabled = traceEnabled;
return this;
}
/**
* Sets the capacity of the datagram packet buffer (in bytes). The default value is {@code 4096} bytes.
*
* @param maxPayloadSize the capacity of the datagram packet buffer
*
* @return {@code this}
*/
public
DnsClient maxPayloadSize(int maxPayloadSize) {
this.maxPayloadSize = maxPayloadSize;
return this;
}
/**
* Enable the automatic inclusion of a optional records that tries to give the remote DNS server a hint about
* how much data the resolver can read per response. Some DNSServer may not support this and so fail to answer
* queries. If you find problems you may want to disable this.
*
* @param optResourceEnabled if optional records inclusion is enabled
*
* @return {@code this}
*/
public
DnsClient optResourceEnabled(boolean optResourceEnabled) {
this.optResourceEnabled = optResourceEnabled;
return this;
}
/**
* @param hostsFileEntriesResolver the {@link HostsFileEntriesResolver} used to first check
* if the hostname is locally aliased.
*
* @return {@code this}
*/
public
DnsClient hostsFileEntriesResolver(HostsFileEntriesResolver hostsFileEntriesResolver) {
this.hostsFileEntriesResolver = hostsFileEntriesResolver;
return this;
}
/**
* Set the {@link DnsServerAddressStreamProvider} which is used to determine which DNS server is used to resolve
* each hostname.
*
* @return {@code this}
*/
public
DnsClient nameServerProvider(DnsServerAddressStreamProvider dnsServerAddressStreamProvider) {
this.dnsServerAddressStreamProvider = checkNotNull(dnsServerAddressStreamProvider, "dnsServerAddressStreamProvider");
return this;
}
/**
* Set the list of search domains of the resolver.
*
* @param searchDomains the search domains
*
* @return {@code this}
*/
public
DnsClient searchDomains(Iterable<String> searchDomains) {
checkNotNull(searchDomains, "searchDomains");
final List<String> list = new ArrayList<String>(4);
for (String f : searchDomains) {
if (f == null) {
break;
}
// Avoid duplicate entries.
if (list.contains(f)) {
continue;
}
list.add(f);
}
this.searchDomains = list.toArray(new String[list.size()]);
return this;
}
/**
* Set the number of dots which must appear in a name before an initial absolute query is made.
* The default value is {@code 1}.
*
* @param ndots the ndots value
*
* @return {@code this}
*/
public
DnsClient ndots(int ndots) {
this.ndots = ndots;
return this;
}
private
DnsCache newCache() {
return new DefaultDnsCache(intValue(minTtl, 0), intValue(maxTtl, Integer.MAX_VALUE), intValue(negativeTtl, 0));
}
/**
* Set if domain / host names should be decoded to unicode when received.
* See <a href="https://tools.ietf.org/html/rfc3492">rfc3492</a>.
*
* @param decodeIdn if should get decoded
*
* @return {@code this}
*/
public
DnsClient decodeToUnicode(boolean decodeIdn) {
this.decodeIdn = decodeIdn;
return this;
}
/**
* Compute a {@link ResolvedAddressTypes} from some {@link InternetProtocolFamily}s.
* An empty input will return the default value, based on "java.net" System properties.
* Valid inputs are (), (IPv4), (IPv6), (Ipv4, IPv6) and (IPv6, IPv4).
*
* @param internetProtocolFamilies a valid sequence of {@link InternetProtocolFamily}s
*
* @return a {@link ResolvedAddressTypes}
*/
public static
ResolvedAddressTypes computeResolvedAddressTypes(InternetProtocolFamily... internetProtocolFamilies) {
if (internetProtocolFamilies == null || internetProtocolFamilies.length == 0) {
return DnsNameResolverAccess.getDefaultResolvedAddressTypes();
}
if (internetProtocolFamilies.length > 2) {
throw new IllegalArgumentException("No more than 2 InternetProtocolFamilies");
}
switch (internetProtocolFamilies[0]) {
case IPv4:
return (internetProtocolFamilies.length >= 2 && internetProtocolFamilies[1] == InternetProtocolFamily.IPv6)
? ResolvedAddressTypes.IPV4_PREFERRED
: ResolvedAddressTypes.IPV4_ONLY;
case IPv6:
return (internetProtocolFamilies.length >= 2 && internetProtocolFamilies[1] == InternetProtocolFamily.IPv4)
? ResolvedAddressTypes.IPV6_PREFERRED
: ResolvedAddressTypes.IPV6_ONLY;
default:
throw new IllegalArgumentException("Couldn't resolve ResolvedAddressTypes from InternetProtocolFamily array");
}
}
/**
* Starts the DNS Name Resolver for the client, which will resolve DNS queries.
*/
public
DnsClient start() {
ReflectiveChannelFactory<DatagramChannel> channelFactory = new ReflectiveChannelFactory<DatagramChannel>(channelType);
// default support is IPV4
if (this.resolvedAddressTypes == null) {
this.resolvedAddressTypes = ResolvedAddressTypes.IPV4_ONLY;
}
if (resolveCache != null && (minTtl != null || maxTtl != null || negativeTtl != null)) {
throw new IllegalStateException("resolveCache and TTLs are mutually exclusive");
}
if (authoritativeDnsServerCache != null && (minTtl != null || maxTtl != null || negativeTtl != null)) {
throw new IllegalStateException("authoritativeDnsServerCache and TTLs are mutually exclusive");
}
DnsCache resolveCache = this.resolveCache != null ? this.resolveCache : newCache();
DnsCache authoritativeDnsServerCache = this.authoritativeDnsServerCache != null ? this.authoritativeDnsServerCache : newCache();
resolver = new DnsNameResolver(eventLoopGroup.next(), channelFactory, resolveCache, authoritativeDnsServerCache,
dnsQueryLifecycleObserverFactory, queryTimeoutMillis, resolvedAddressTypes, recursionDesired,
maxQueriesPerResolve, traceEnabled, maxPayloadSize, optResourceEnabled, hostsFileEntriesResolver,
dnsServerAddressStreamProvider, searchDomains, ndots, decodeIdn);
return this;
}
/**
@ -258,6 +608,10 @@ class DnsClient {
*/
public
String resolve(String hostname) {
if (resolver == null) {
start();
}
if (resolver.resolvedAddressTypes() == ResolvedAddressTypes.IPV4_ONLY) {
return resolve(hostname, DnsRecordType.A);
}
@ -279,6 +633,10 @@ class DnsClient {
@SuppressWarnings("unchecked")
private
<T> T resolve(String hostname, DnsRecordType type) {
if (resolver == null) {
start();
}
hostname = IDN.toASCII(hostname);
final int value = type.intValue();
@ -368,6 +726,15 @@ class DnsClient {
*/
public
void reset() {
if (resolver == null) {
start();
}
clearResolver();
}
private
void clearResolver() {
resolver.resolveCache()
.clear();
}
@ -403,8 +770,11 @@ class DnsClient {
private
void stopInThread() {
reset();
resolver.close(); // also closes the UDP channel that DNS client uses
clearResolver();
if (resolver != null) {
resolver.close(); // also closes the UDP channel that DNS client uses
}
// Sometimes there might be "lingering" connections (ie, halfway though registration) that need to be closed.
long maxShutdownWaitTimeInMilliSeconds = EndPoint.maxShutdownWaitTimeInMilliSeconds;

981
src/io/netty/resolver/dns/DnsNameResolver.java Normal file
View File

@ -0,0 +1,981 @@
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.resolver.dns;
import static io.netty.resolver.dns.DefaultDnsServerAddressStreamProvider.DNS_PORT;
import static io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.parseEtcResolverFirstNdots;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.ObjectUtil.checkPositive;
import java.lang.reflect.Method;
import java.net.IDN;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.AddressedEnvelope;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFactory;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.FixedRecvByteBufAllocator;
import io.netty.channel.socket.DatagramChannel;
import io.netty.channel.socket.InternetProtocolFamily;
import io.netty.handler.codec.dns.DatagramDnsQueryEncoder;
import io.netty.handler.codec.dns.DatagramDnsResponse;
import io.netty.handler.codec.dns.DatagramDnsResponseDecoder;
import io.netty.handler.codec.dns.DnsQuestion;
import io.netty.handler.codec.dns.DnsRawRecord;
import io.netty.handler.codec.dns.DnsRecord;
import io.netty.handler.codec.dns.DnsRecordType;
import io.netty.handler.codec.dns.DnsResponse;
import io.netty.resolver.HostsFileEntriesResolver;
import io.netty.resolver.InetNameResolver;
import io.netty.resolver.ResolvedAddressTypes;
import io.netty.util.NetUtil;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.FastThreadLocal;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.Promise;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.StringUtil;
import io.netty.util.internal.UnstableApi;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
/**
* A DNS-based {@link InetNameResolver}
*/
@SuppressWarnings("unused")
@UnstableApi
public class DnsNameResolver extends InetNameResolver {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(DnsNameResolver.class);
private static final String LOCALHOST = "localhost";
private static final InetAddress LOCALHOST_ADDRESS;
private static final DnsRecord[] EMPTY_ADDITIONALS = new DnsRecord[0];
private static final DnsRecordType[] IPV4_ONLY_RESOLVED_RECORD_TYPES = {DnsRecordType.A};
private static final InternetProtocolFamily[] IPV4_ONLY_RESOLVED_PROTOCOL_FAMILIES = {InternetProtocolFamily.IPv4};
private static final DnsRecordType[] IPV4_PREFERRED_RESOLVED_RECORD_TYPES = {DnsRecordType.A, DnsRecordType.AAAA};
private static final InternetProtocolFamily[] IPV4_PREFERRED_RESOLVED_PROTOCOL_FAMILIES = {InternetProtocolFamily.IPv4,
InternetProtocolFamily.IPv6};
private static final DnsRecordType[] IPV6_ONLY_RESOLVED_RECORD_TYPES = {DnsRecordType.AAAA};
private static final InternetProtocolFamily[] IPV6_ONLY_RESOLVED_PROTOCOL_FAMILIES = {InternetProtocolFamily.IPv6};
private static final DnsRecordType[] IPV6_PREFERRED_RESOLVED_RECORD_TYPES = {DnsRecordType.AAAA, DnsRecordType.A};
private static final InternetProtocolFamily[] IPV6_PREFERRED_RESOLVED_PROTOCOL_FAMILIES = {InternetProtocolFamily.IPv6,
InternetProtocolFamily.IPv4};
static final ResolvedAddressTypes DEFAULT_RESOLVE_ADDRESS_TYPES;
static final String[] DEFAULT_SEARCH_DOMAINS;
private static final int DEFAULT_NDOTS;
static {
if (NetUtil.isIpV4StackPreferred()) {
DEFAULT_RESOLVE_ADDRESS_TYPES = ResolvedAddressTypes.IPV4_ONLY;
LOCALHOST_ADDRESS = NetUtil.LOCALHOST4;
}
else {
if (NetUtil.isIpV6AddressesPreferred()) {
DEFAULT_RESOLVE_ADDRESS_TYPES = ResolvedAddressTypes.IPV6_PREFERRED;
LOCALHOST_ADDRESS = NetUtil.LOCALHOST6;
}
else {
DEFAULT_RESOLVE_ADDRESS_TYPES = ResolvedAddressTypes.IPV4_PREFERRED;
LOCALHOST_ADDRESS = NetUtil.LOCALHOST4;
}
}
}
static {
String[] searchDomains;
try {
Class<?> configClass = Class.forName("sun.net.dns.ResolverConfiguration");
Method open = configClass.getMethod("open");
Method nameservers = configClass.getMethod("searchlist");
Object instance = open.invoke(null);
@SuppressWarnings("unchecked")
List<String> list = (List<String>) nameservers.invoke(instance);
searchDomains = list.toArray(new String[list.size()]);
} catch (Exception ignore) {
// Failed to get the system name search domain list.
searchDomains = EmptyArrays.EMPTY_STRINGS;
}
DEFAULT_SEARCH_DOMAINS = searchDomains;
int ndots;
try {
ndots = parseEtcResolverFirstNdots();
} catch (Exception ignore) {
ndots = UnixResolverDnsServerAddressStreamProvider.DEFAULT_NDOTS;
}
DEFAULT_NDOTS = ndots;
}
private static final DatagramDnsResponseDecoder DECODER = new DatagramDnsResponseDecoder();
private static final DatagramDnsQueryEncoder ENCODER = new DatagramDnsQueryEncoder();
final Future<Channel> channelFuture;
final DatagramChannel ch;
/**
* Manages the {@link DnsQueryContext}s in progress and their query IDs.
*/
final DnsQueryContextManager queryContextManager = new DnsQueryContextManager();
/**
* Cache for {@link #doResolve(String, Promise)} and {@link #doResolveAll(String, Promise)}.
*/
private final DnsCache resolveCache;
private final DnsCache authoritativeDnsServerCache;
private final FastThreadLocal<DnsServerAddressStream> nameServerAddrStream = new FastThreadLocal<DnsServerAddressStream>() {
@Override
protected
DnsServerAddressStream initialValue() throws Exception {
return dnsServerAddressStreamProvider.nameServerAddressStream("");
}
};
private final long queryTimeoutMillis;
private final int maxQueriesPerResolve;
private final ResolvedAddressTypes resolvedAddressTypes;
private final InternetProtocolFamily[] resolvedInternetProtocolFamilies;
private final boolean recursionDesired;
private final int maxPayloadSize;
private final boolean optResourceEnabled;
private final HostsFileEntriesResolver hostsFileEntriesResolver;
private final DnsServerAddressStreamProvider dnsServerAddressStreamProvider;
private final String[] searchDomains;
private final int ndots;
private final boolean supportsAAAARecords;
private final boolean supportsARecords;
private final InternetProtocolFamily preferredAddressType;
private final DnsRecordType[] resolveRecordTypes;
private final boolean decodeIdn;
private final DnsQueryLifecycleObserverFactory dnsQueryLifecycleObserverFactory;
/**
* Creates a new DNS-based name resolver that communicates with the specified list of DNS servers.
*
* @param eventLoop the {@link EventLoop} which will perform the communication with the DNS servers
* @param channelFactory the {@link ChannelFactory} that will create a {@link DatagramChannel}
* @param resolveCache the DNS resolved entries cache
* @param authoritativeDnsServerCache the cache used to find the authoritative DNS server for a domain
* @param dnsQueryLifecycleObserverFactory used to generate new instances of {@link DnsQueryLifecycleObserver} which
* can be used to track metrics for DNS servers.
* @param queryTimeoutMillis timeout of each DNS query in millis
* @param resolvedAddressTypes the preferred address types
* @param recursionDesired if recursion desired flag must be set
* @param maxQueriesPerResolve the maximum allowed number of DNS queries for a given name resolution
* @param traceEnabled if trace is enabled
* @param maxPayloadSize the capacity of the datagram packet buffer
* @param optResourceEnabled if automatic inclusion of a optional records is enabled
* @param hostsFileEntriesResolver the {@link HostsFileEntriesResolver} used to check for local aliases
* @param dnsServerAddressStreamProvider The {@link DnsServerAddressStreamProvider} used to determine the name
* servers for each hostname lookup.
* @param searchDomains the list of search domain
* (can be null, if so, will try to default to the underlying platform ones)
* @param ndots the ndots value
* @param decodeIdn {@code true} if domain / host names should be decoded to unicode when received.
* See <a href="https://tools.ietf.org/html/rfc3492">rfc3492</a>.
*/
public
DnsNameResolver(EventLoop eventLoop,
ChannelFactory<? extends DatagramChannel> channelFactory,
final DnsCache resolveCache,
DnsCache authoritativeDnsServerCache,
DnsQueryLifecycleObserverFactory dnsQueryLifecycleObserverFactory,
long queryTimeoutMillis,
ResolvedAddressTypes resolvedAddressTypes,
boolean recursionDesired,
int maxQueriesPerResolve,
boolean traceEnabled,
int maxPayloadSize,
boolean optResourceEnabled,
HostsFileEntriesResolver hostsFileEntriesResolver,
DnsServerAddressStreamProvider dnsServerAddressStreamProvider,
String[] searchDomains,
int ndots,
boolean decodeIdn) {
super(eventLoop);
this.queryTimeoutMillis = checkPositive(queryTimeoutMillis, "queryTimeoutMillis");
this.resolvedAddressTypes = resolvedAddressTypes != null ? resolvedAddressTypes : DEFAULT_RESOLVE_ADDRESS_TYPES;
this.recursionDesired = recursionDesired;
this.maxQueriesPerResolve = checkPositive(maxQueriesPerResolve, "maxQueriesPerResolve");
this.maxPayloadSize = checkPositive(maxPayloadSize, "maxPayloadSize");
this.optResourceEnabled = optResourceEnabled;
this.hostsFileEntriesResolver = checkNotNull(hostsFileEntriesResolver, "hostsFileEntriesResolver");
this.dnsServerAddressStreamProvider = checkNotNull(dnsServerAddressStreamProvider, "dnsServerAddressStreamProvider");
this.resolveCache = checkNotNull(resolveCache, "resolveCache");
this.authoritativeDnsServerCache = checkNotNull(authoritativeDnsServerCache, "authoritativeDnsServerCache");
if (traceEnabled) {
if (dnsQueryLifecycleObserverFactory instanceof NoopDnsQueryLifecycleObserverFactory) {
this.dnsQueryLifecycleObserverFactory = new TraceDnsQueryLifeCycleObserverFactory();
}
else {
this.dnsQueryLifecycleObserverFactory = new BiDnsQueryLifecycleObserverFactory(new TraceDnsQueryLifeCycleObserverFactory(),
dnsQueryLifecycleObserverFactory);
}
}
else {
this.dnsQueryLifecycleObserverFactory = checkNotNull(dnsQueryLifecycleObserverFactory, "dnsQueryLifecycleObserverFactory");
}
this.searchDomains = searchDomains != null ? searchDomains.clone() : DEFAULT_SEARCH_DOMAINS;
this.ndots = ndots >= 0 ? ndots : DEFAULT_NDOTS;
this.decodeIdn = decodeIdn;
switch (this.resolvedAddressTypes) {
case IPV4_ONLY:
supportsAAAARecords = false;
supportsARecords = true;
resolveRecordTypes = IPV4_ONLY_RESOLVED_RECORD_TYPES;
resolvedInternetProtocolFamilies = IPV4_ONLY_RESOLVED_PROTOCOL_FAMILIES;
preferredAddressType = InternetProtocolFamily.IPv4;
break;
case IPV4_PREFERRED:
supportsAAAARecords = true;
supportsARecords = true;
resolveRecordTypes = IPV4_PREFERRED_RESOLVED_RECORD_TYPES;
resolvedInternetProtocolFamilies = IPV4_PREFERRED_RESOLVED_PROTOCOL_FAMILIES;
preferredAddressType = InternetProtocolFamily.IPv4;
break;
case IPV6_ONLY:
supportsAAAARecords = true;
supportsARecords = false;
resolveRecordTypes = IPV6_ONLY_RESOLVED_RECORD_TYPES;
resolvedInternetProtocolFamilies = IPV6_ONLY_RESOLVED_PROTOCOL_FAMILIES;
preferredAddressType = InternetProtocolFamily.IPv6;
break;
case IPV6_PREFERRED:
supportsAAAARecords = true;
supportsARecords = true;
resolveRecordTypes = IPV6_PREFERRED_RESOLVED_RECORD_TYPES;
resolvedInternetProtocolFamilies = IPV6_PREFERRED_RESOLVED_PROTOCOL_FAMILIES;
preferredAddressType = InternetProtocolFamily.IPv6;
break;
default:
throw new IllegalArgumentException("Unknown ResolvedAddressTypes " + resolvedAddressTypes);
}
Bootstrap b = new Bootstrap();
b.group(executor());
b.channelFactory(channelFactory);
b.option(ChannelOption.DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION, true);
final DnsResponseHandler responseHandler = new DnsResponseHandler(executor().<Channel>newPromise());
b.handler(new ChannelInitializer<DatagramChannel>() {
@Override
protected void initChannel(DatagramChannel ch) throws Exception {
ch.pipeline().addLast(DECODER, ENCODER, responseHandler);
}
});
channelFuture = responseHandler.channelActivePromise;
ch = (DatagramChannel) b.register().channel();
ch.config().setRecvByteBufAllocator(new FixedRecvByteBufAllocator(maxPayloadSize));
ch.closeFuture().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
resolveCache.clear();
}
});
}
// Only here to override in unit tests.
int dnsRedirectPort(@SuppressWarnings("unused") InetAddress server) {
return DNS_PORT;
}
final DnsQueryLifecycleObserverFactory dnsQueryLifecycleObserverFactory() {
return dnsQueryLifecycleObserverFactory;
}
/**
* Provides the opportunity to sort the name servers before following a redirected DNS query.
* @param nameServers The addresses of the DNS servers which are used in the event of a redirect.
* @return A {@link DnsServerAddressStream} which will be used to follow the DNS redirect.
*/
protected DnsServerAddressStream uncachedRedirectDnsServerStream(List<InetSocketAddress> nameServers) {
return DnsServerAddresses.sequential(nameServers).stream();
}
/**
* Returns the resolution cache.
*/
public DnsCache resolveCache() {
return resolveCache;
}
/**
* Returns the cache used for authoritative DNS servers for a domain.
*/
public DnsCache authoritativeDnsServerCache() {
return authoritativeDnsServerCache;
}
/**
* Returns the timeout of each DNS query performed by this resolver (in milliseconds).
* The default value is 5 seconds.
*/
public long queryTimeoutMillis() {
return queryTimeoutMillis;
}
/**
* Returns the {@link ResolvedAddressTypes} resolved by {@link #resolve(String)}.
* The default value depends on the value of the system property {@code "java.net.preferIPv6Addresses"}.
*/
public ResolvedAddressTypes resolvedAddressTypes() {
return resolvedAddressTypes;
}
InternetProtocolFamily[] resolvedInternetProtocolFamiliesUnsafe() {
return resolvedInternetProtocolFamilies;
}
final String[] searchDomains() {
return searchDomains;
}
final int ndots() {
return ndots;
}
final boolean supportsAAAARecords() {
return supportsAAAARecords;
}
final boolean supportsARecords() {
return supportsARecords;
}
final InternetProtocolFamily preferredAddressType() {
return preferredAddressType;
}
final DnsRecordType[] resolveRecordTypes() {
return resolveRecordTypes;
}
final boolean isDecodeIdn() {
return decodeIdn;
}
/**
* Returns {@code true} if and only if this resolver sends a DNS query with the RD (recursion desired) flag set.
* The default value is {@code true}.
*/
public boolean isRecursionDesired() {
return recursionDesired;
}
/**
* Returns the maximum allowed number of DNS queries to send when resolving a host name.
* The default value is {@code 8}.
*/
public int maxQueriesPerResolve() {
return maxQueriesPerResolve;
}
/**
* Returns the capacity of the datagram packet buffer (in bytes). The default value is {@code 4096} bytes.
*/
public int maxPayloadSize() {
return maxPayloadSize;
}
/**
* Returns the automatic inclusion of a optional records that tries to give the remote DNS server a hint about how
* much data the resolver can read per response is enabled.
*/
public boolean isOptResourceEnabled() {
return optResourceEnabled;
}
/**
* Returns the component that tries to resolve hostnames against the hosts file prior to asking to
* remotes DNS servers.
*/
public HostsFileEntriesResolver hostsFileEntriesResolver() {
return hostsFileEntriesResolver;
}
/**
* Closes the internal datagram channel used for sending and receiving DNS messages, and clears all DNS resource
* records from the cache. Attempting to send a DNS query or to resolve a domain name will fail once this method
* has been called.
*/
@Override
public void close() {
if (ch.isOpen()) {
ch.close();
}
}
@Override
protected EventLoop executor() {
return (EventLoop) super.executor();
}
private InetAddress resolveHostsFileEntry(String hostname) {
if (hostsFileEntriesResolver == null) {
return null;
} else {
InetAddress address = hostsFileEntriesResolver.address(hostname, resolvedAddressTypes);
if (address == null && PlatformDependent.isWindows() && LOCALHOST.equalsIgnoreCase(hostname)) {
// If we tried to resolve localhost we need workaround that windows removed localhost from its
// hostfile in later versions.
// See https://github.com/netty/netty/issues/5386
return LOCALHOST_ADDRESS;
}
return address;
}
}
/**
* Resolves the specified name into an address.
*
* @param inetHost the name to resolve
* @param additionals additional records ({@code OPT})
*
* @return the address as the result of the resolution
*/
public final Future<InetAddress> resolve(String inetHost, Iterable<DnsRecord> additionals) {
return resolve(inetHost, additionals, executor().<InetAddress>newPromise());
}
/**
* Resolves the specified name into an address.
*
* @param inetHost the name to resolve
* @param additionals additional records ({@code OPT})
* @param promise the {@link Promise} which will be fulfilled when the name resolution is finished
*
* @return the address as the result of the resolution
*/
public final Future<InetAddress> resolve(String inetHost, Iterable<DnsRecord> additionals,
Promise<InetAddress> promise) {
checkNotNull(promise, "promise");
DnsRecord[] additionalsArray = toArray(additionals, true);
try {
doResolve(inetHost, additionalsArray, promise, resolveCache);
return promise;
} catch (Exception e) {
return promise.setFailure(e);
}
}
/**
* Resolves the specified host name and port into a list of address.
*
* @param inetHost the name to resolve
* @param additionals additional records ({@code OPT})
*
* @return the list of the address as the result of the resolution
*/
public final Future<List<InetAddress>> resolveAll(String inetHost, Iterable<DnsRecord> additionals) {
return resolveAll(inetHost, additionals, executor().<List<InetAddress>>newPromise());
}
/**
* Resolves the specified host name and port into a list of address.
*
* @param inetHost the name to resolve
* @param additionals additional records ({@code OPT})
* @param promise the {@link Promise} which will be fulfilled when the name resolution is finished
*
* @return the list of the address as the result of the resolution
*/
public final Future<List<InetAddress>> resolveAll(String inetHost, Iterable<DnsRecord> additionals,
Promise<List<InetAddress>> promise) {
checkNotNull(promise, "promise");
DnsRecord[] additionalsArray = toArray(additionals, true);
try {
doResolveAll(inetHost, additionalsArray, promise, resolveCache);
return promise;
} catch (Exception e) {
return promise.setFailure(e);
}
}
@Override
protected void doResolve(String inetHost, Promise<InetAddress> promise) throws Exception {
doResolve(inetHost, EMPTY_ADDITIONALS, promise, resolveCache);
}
private static DnsRecord[] toArray(Iterable<DnsRecord> additionals, boolean validateType) {
checkNotNull(additionals, "additionals");
if (additionals instanceof Collection) {
Collection<DnsRecord> records = (Collection<DnsRecord>) additionals;
for (DnsRecord r: additionals) {
validateAdditional(r, validateType);
}
return records.toArray(new DnsRecord[records.size()]);
}
Iterator<DnsRecord> additionalsIt = additionals.iterator();
if (!additionalsIt.hasNext()) {
return EMPTY_ADDITIONALS;
}
List<DnsRecord> records = new ArrayList<DnsRecord>();
do {
DnsRecord r = additionalsIt.next();
validateAdditional(r, validateType);
records.add(r);
} while (additionalsIt.hasNext());
return records.toArray(new DnsRecord[records.size()]);
}
private static void validateAdditional(DnsRecord record, boolean validateType) {
checkNotNull(record, "record");
if (validateType && record instanceof DnsRawRecord) {
throw new IllegalArgumentException("DnsRawRecord implementations not allowed: " + record);
}
}
private InetAddress loopbackAddress() {
return preferredAddressType().localhost();
}
/**
* Hook designed for extensibility so one can pass a different cache on each resolution attempt
* instead of using the global one.
*/
protected void doResolve(String inetHost,
DnsRecord[] additionals,
Promise<InetAddress> promise,
DnsCache resolveCache) throws Exception {
if (inetHost == null || inetHost.isEmpty()) {
// If an empty hostname is used we should use "localhost", just like InetAddress.getByName(...) does.
promise.setSuccess(loopbackAddress());
return;
}
final byte[] bytes = NetUtil.createByteArrayFromIpAddressString(inetHost);
if (bytes != null) {
// The inetHost is actually an ipaddress.
promise.setSuccess(InetAddress.getByAddress(bytes));
return;
}
final String hostname = hostname(inetHost);
InetAddress hostsFileEntry = resolveHostsFileEntry(hostname);
if (hostsFileEntry != null) {
promise.setSuccess(hostsFileEntry);
return;
}
if (!doResolveCached(hostname, additionals, promise, resolveCache)) {
doResolveUncached(hostname, additionals, promise, resolveCache);
}
}
private boolean doResolveCached(String hostname,
DnsRecord[] additionals,
Promise<InetAddress> promise,
DnsCache resolveCache) {
final List<DnsCacheEntry> cachedEntries = resolveCache.get(hostname, additionals);
if (cachedEntries == null || cachedEntries.isEmpty()) {
return false;
}
InetAddress address = null;
Throwable cause = null;
synchronized (cachedEntries) {
final int numEntries = cachedEntries.size();
assert numEntries > 0;
if (cachedEntries.get(0).cause() != null) {
cause = cachedEntries.get(0).cause();
} else {
// Find the first entry with the preferred address type.
for (InternetProtocolFamily f : resolvedInternetProtocolFamilies) {
for (int i = 0; i < numEntries; i++) {
final DnsCacheEntry e = cachedEntries.get(i);
if (f.addressType().isInstance(e.address())) {
address = e.address();
break;
}
}
}
}
}
if (address != null) {
trySuccess(promise, address);
return true;
}
if (cause != null) {
tryFailure(promise, cause);
return true;
}
return false;
}
private static <T> void trySuccess(Promise<T> promise, T result) {
if (!promise.trySuccess(result)) {
logger.warn("Failed to notify success ({}) to a promise: {}", result, promise);
}
}
private static void tryFailure(Promise<?> promise, Throwable cause) {
if (!promise.tryFailure(cause)) {
logger.warn("Failed to notify failure to a promise: {}", promise, cause);
}
}
private void doResolveUncached(String hostname,
DnsRecord[] additionals,
Promise<InetAddress> promise,
DnsCache resolveCache) {
new SingleResolverContext(this, hostname, additionals, resolveCache,
dnsServerAddressStreamProvider.nameServerAddressStream(hostname)).resolve(promise);
}
static final class SingleResolverContext extends DnsNameResolverContext<InetAddress> {
SingleResolverContext(DnsNameResolver parent, String hostname,
DnsRecord[] additionals, DnsCache resolveCache, DnsServerAddressStream nameServerAddrs) {
super(parent, hostname, additionals, resolveCache, nameServerAddrs);
}
@Override
DnsNameResolverContext<InetAddress> newResolverContext(DnsNameResolver parent, String hostname,
DnsRecord[] additionals, DnsCache resolveCache,
DnsServerAddressStream nameServerAddrs) {
return new SingleResolverContext(parent, hostname, additionals, resolveCache, nameServerAddrs);
}
@Override
boolean finishResolve(
Class<? extends InetAddress> addressType, List<DnsCacheEntry> resolvedEntries,
Promise<InetAddress> promise) {
final int numEntries = resolvedEntries.size();
for (int i = 0; i < numEntries; i++) {
final InetAddress a = resolvedEntries.get(i).address();
if (addressType.isInstance(a)) {
trySuccess(promise, a);
return true;
}
}
return false;
}
}
@Override
protected void doResolveAll(String inetHost, Promise<List<InetAddress>> promise) throws Exception {
doResolveAll(inetHost, EMPTY_ADDITIONALS, promise, resolveCache);
}
/**
* Hook designed for extensibility so one can pass a different cache on each resolution attempt
* instead of using the global one.
*/
protected void doResolveAll(String inetHost,
DnsRecord[] additionals,
Promise<List<InetAddress>> promise,
DnsCache resolveCache) throws Exception {
if (inetHost == null || inetHost.isEmpty()) {
// If an empty hostname is used we should use "localhost", just like InetAddress.getAllByName(...) does.
promise.setSuccess(Collections.singletonList(loopbackAddress()));
return;
}
final byte[] bytes = NetUtil.createByteArrayFromIpAddressString(inetHost);
if (bytes != null) {
// The unresolvedAddress was created via a String that contains an ipaddress.
promise.setSuccess(Collections.singletonList(InetAddress.getByAddress(bytes)));
return;
}
final String hostname = hostname(inetHost);
InetAddress hostsFileEntry = resolveHostsFileEntry(hostname);
if (hostsFileEntry != null) {
promise.setSuccess(Collections.singletonList(hostsFileEntry));
return;
}
if (!doResolveAllCached(hostname, additionals, promise, resolveCache)) {
doResolveAllUncached(hostname, additionals, promise, resolveCache);
}
}
private boolean doResolveAllCached(String hostname,
DnsRecord[] additionals,
Promise<List<InetAddress>> promise,
DnsCache resolveCache) {
final List<DnsCacheEntry> cachedEntries = resolveCache.get(hostname, additionals);
if (cachedEntries == null || cachedEntries.isEmpty()) {
return false;
}
List<InetAddress> result = null;
Throwable cause = null;
synchronized (cachedEntries) {
final int numEntries = cachedEntries.size();
assert numEntries > 0;
if (cachedEntries.get(0).cause() != null) {
cause = cachedEntries.get(0).cause();
} else {
for (InternetProtocolFamily f : resolvedInternetProtocolFamilies) {
for (int i = 0; i < numEntries; i++) {
final DnsCacheEntry e = cachedEntries.get(i);
if (f.addressType().isInstance(e.address())) {
if (result == null) {
result = new ArrayList<InetAddress>(numEntries);
}
result.add(e.address());
}
}
}
}
}
if (result != null) {
trySuccess(promise, result);
return true;
}
if (cause != null) {
tryFailure(promise, cause);
return true;
}
return false;
}
static final class ListResolverContext extends DnsNameResolverContext<List<InetAddress>> {
ListResolverContext(DnsNameResolver parent, String hostname,
DnsRecord[] additionals, DnsCache resolveCache, DnsServerAddressStream nameServerAddrs) {
super(parent, hostname, additionals, resolveCache, nameServerAddrs);
}
@Override
DnsNameResolverContext<List<InetAddress>> newResolverContext(
DnsNameResolver parent, String hostname, DnsRecord[] additionals, DnsCache resolveCache,
DnsServerAddressStream nameServerAddrs) {
return new ListResolverContext(parent, hostname, additionals, resolveCache, nameServerAddrs);
}
@Override
boolean finishResolve(
Class<? extends InetAddress> addressType, List<DnsCacheEntry> resolvedEntries,
Promise<List<InetAddress>> promise) {
List<InetAddress> result = null;
final int numEntries = resolvedEntries.size();
for (int i = 0; i < numEntries; i++) {
final InetAddress a = resolvedEntries.get(i).address();
if (addressType.isInstance(a)) {
if (result == null) {
result = new ArrayList<InetAddress>(numEntries);
}
result.add(a);
}
}
if (result != null) {
promise.trySuccess(result);
return true;
}
return false;
}
}
private void doResolveAllUncached(String hostname,
DnsRecord[] additionals,
Promise<List<InetAddress>> promise,
DnsCache resolveCache) {
new ListResolverContext(this, hostname, additionals, resolveCache,
dnsServerAddressStreamProvider.nameServerAddressStream(hostname)).resolve(promise);
}
private static String hostname(String inetHost) {
String hostname = IDN.toASCII(inetHost);
// Check for http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6894622
if (StringUtil.endsWith(inetHost, '.') && !StringUtil.endsWith(hostname, '.')) {
hostname += ".";
}
return hostname;
}
/**
* Sends a DNS query with the specified question.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(DnsQuestion question) {
return query(nextNameServerAddress(), question);
}
/**
* Sends a DNS query with the specified question with additional records.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
DnsQuestion question, Iterable<DnsRecord> additionals) {
return query(nextNameServerAddress(), question, additionals);
}
/**
* Sends a DNS query with the specified question.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
DnsQuestion question, Promise<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>> promise) {
return query(nextNameServerAddress(), question, Collections.<DnsRecord>emptyList(), promise);
}
private InetSocketAddress nextNameServerAddress() {
return nameServerAddrStream.get().next();
}
/**
* Sends a DNS query with the specified question using the specified name server list.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
InetSocketAddress nameServerAddr, DnsQuestion question) {
return query0(nameServerAddr, question, EMPTY_ADDITIONALS,
ch.eventLoop().<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>>newPromise());
}
/**
* Sends a DNS query with the specified question with additional records using the specified name server list.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
InetSocketAddress nameServerAddr, DnsQuestion question, Iterable<DnsRecord> additionals) {
return query0(nameServerAddr, question, toArray(additionals, false),
ch.eventLoop().<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>>newPromise());
}
/**
* Sends a DNS query with the specified question using the specified name server list.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
InetSocketAddress nameServerAddr, DnsQuestion question,
Promise<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>> promise) {
return query0(nameServerAddr, question, EMPTY_ADDITIONALS, promise);
}
/**
* Sends a DNS query with the specified question with additional records using the specified name server list.
*/
public Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query(
InetSocketAddress nameServerAddr, DnsQuestion question,
Iterable<DnsRecord> additionals,
Promise<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>> promise) {
return query0(nameServerAddr, question, toArray(additionals, false), promise);
}
final Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query0(
InetSocketAddress nameServerAddr, DnsQuestion question,
DnsRecord[] additionals,
Promise<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>> promise) {
return query0(nameServerAddr, question, additionals, ch.newPromise(), promise);
}
final Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> query0(
InetSocketAddress nameServerAddr, DnsQuestion question,
DnsRecord[] additionals,
ChannelPromise writePromise,
Promise<AddressedEnvelope<? extends DnsResponse, InetSocketAddress>> promise) {
assert !writePromise.isVoid();
final Promise<AddressedEnvelope<DnsResponse, InetSocketAddress>> castPromise = cast(
checkNotNull(promise, "promise"));
try {
new DnsQueryContext(this, nameServerAddr, question, additionals, castPromise).query(writePromise);
return castPromise;
} catch (Exception e) {
return castPromise.setFailure(e);
}
}
@SuppressWarnings("unchecked")
private static Promise<AddressedEnvelope<DnsResponse, InetSocketAddress>> cast(Promise<?> promise) {
return (Promise<AddressedEnvelope<DnsResponse, InetSocketAddress>>) promise;
}
private final class DnsResponseHandler extends ChannelInboundHandlerAdapter {
private final Promise<Channel> channelActivePromise;
DnsResponseHandler(Promise<Channel> channelActivePromise) {
this.channelActivePromise = channelActivePromise;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
final DatagramDnsResponse res = (DatagramDnsResponse) msg;
final int queryId = res.id();
if (logger.isDebugEnabled()) {
logger.debug("{} RECEIVED: [{}: {}], {}", ch, queryId, res.sender(), res);
}
final DnsQueryContext qCtx = queryContextManager.get(res.sender(), queryId);
if (qCtx == null) {
logger.warn("{} Received a DNS response with an unknown ID: {}", ch, queryId);
return;
}
qCtx.finish(res);
} finally {
ReferenceCountUtil.safeRelease(msg);
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
super.channelActive(ctx);
channelActivePromise.setSuccess(ctx.channel());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.warn("{} Unexpected exception: ", ch, cause);
}
}
}

6
src/io/netty/resolver/dns/DnsNameResolverAccess.java
View File

@ -16,6 +16,7 @@
package io.netty.resolver.dns;
import io.netty.buffer.ByteBuf;
import io.netty.resolver.ResolvedAddressTypes;
public final
class DnsNameResolverAccess {
@ -25,6 +26,11 @@ class DnsNameResolverAccess {
return DnsNameResolverContext.decodeDomainName(byteBuff);
}
public static
ResolvedAddressTypes getDefaultResolvedAddressTypes() {
return DnsNameResolver.DEFAULT_RESOLVE_ADDRESS_TYPES;
}
private
DnsNameResolverAccess() {
}

25
test/dorkbox/network/DnsTests.java
View File

@ -15,15 +15,16 @@
*/
package dorkbox.network;
import dorkbox.network.dns.record.MailExchangerRecord;
import dorkbox.network.dns.record.ServiceRecord;
import dorkbox.network.dns.record.StartOfAuthorityRecord;
import org.junit.Test;
import static org.junit.Assert.fail;
import java.net.UnknownHostException;
import java.util.List;
import static org.junit.Assert.fail;
import org.junit.Test;
import dorkbox.network.dns.record.MailExchangerRecord;
import dorkbox.network.dns.record.ServiceRecord;
import dorkbox.network.dns.record.StartOfAuthorityRecord;
public class DnsTests {
@ -31,7 +32,7 @@ public class DnsTests {
public
void decode_A_Record() throws UnknownHostException {
//DnsClient dnsClient = new DnsClient("127.0.1.1");
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
String answer = dnsClient.resolveA("google.com");
dnsClient.stop();
@ -45,7 +46,7 @@ public class DnsTests {
// PTR absolutely MUST end in '.in-addr.arpa' in order for the DNS server to understand it.
// our DNS client will FIX THIS, so that end-users do NOT have to know this!
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
String answer = dnsClient.resolvePTR("204.228.150.3");
dnsClient.stop();
@ -56,7 +57,7 @@ public class DnsTests {
@Test
public void decode_CNAME_Record() {
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
String answer = dnsClient.resolveCNAME("www.atmos.org");
dnsClient.stop();
@ -67,7 +68,7 @@ public class DnsTests {
@Test
public void decode_MX_Record() {
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
MailExchangerRecord answer = dnsClient.resolveMX("bbc.co.uk");
final String name = answer.name();
dnsClient.stop();
@ -79,7 +80,7 @@ public class DnsTests {
@Test
public void decode_SRV_Record() {
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
ServiceRecord answer = dnsClient.resolveSRV("_pop3._tcp.fudo.org");
final String name = answer.name();
dnsClient.stop();
@ -91,7 +92,7 @@ public class DnsTests {
@Test
public void decode_SOA_Record() {
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
StartOfAuthorityRecord answer = dnsClient.resolveSOA("google.com");
final String nameServer = answer.primaryNameServer();
dnsClient.stop();
@ -104,7 +105,7 @@ public class DnsTests {
@Test
public void decode_TXT_Record() {
DnsClient dnsClient = new DnsClient(DnsClient.DNS_SERVER_LIST);
DnsClient dnsClient = new DnsClient();
List<String> answer = dnsClient.resolveTXT("real-world-systems.com");
final String name = answer.get(0);
dnsClient.stop();