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Virtual DNS
=========================

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.oldratlee</groupId>
<artifactId>virtual-dns</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>${project.artifactId}</name>
<inceptionYear>2014</inceptionYear>
<licenses>
<license>
<name>Apache 2</name>
<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
<comments>A business-friendly OSS license</comments>
</license>
</licenses>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- Testing libs -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
</dependencies>
<developers>
<developer>
<name>Jerry Lee</name>
<id>oldratlee</id>
<email>oldratlee(AT)gmail(DOT)com</email>
<roles>
<role>Developer</role>
</roles>
<timezone>+8</timezone>
</developer>
</developers>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
</plugins>
</build>
</project>

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src/main/java/com/oldratlee/vdns/Host.java Normal file
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package com.oldratlee.vdns;
import java.io.Serializable;
import java.util.Date;
public class Host implements Serializable {
private static final long serialVersionUID = -7476648934387757732L;
private final String host;
private final String ip;
private final Date expiration;
public String getHost() {
return host;
}
public String getIp() {
return ip;
}
public Date getExpiration() {
return expiration;
}
public Host(String host, String ip, Date expiration) {
this.host = host;
this.ip = ip;
this.expiration = expiration;
}
@Override
public String toString() {
return "Host{" +
"host='" + host + '\'' +
", ip='" + ip + '\'' +
", expiration=" + expiration +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Host host1 = (Host) o;
if (host != null ? !host.equals(host1.host) : host1.host != null)
return false;
if (ip != null ? !ip.equals(host1.ip) : host1.ip != null) return false;
return !(expiration != null ? !expiration.equals(host1.expiration) : host1.expiration != null);
}
@Override
public int hashCode() {
int result = host != null ? host.hashCode() : 0;
result = 31 * result + (ip != null ? ip.hashCode() : 0);
result = 31 * result + (expiration != null ? expiration.hashCode() : 0);
return result;
}
}

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src/main/java/com/oldratlee/vdns/VirtualDns.java Normal file
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package com.oldratlee.vdns;
import com.oldratlee.vdns.internal.InetAddressCacheUtil;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import java.util.Properties;
/**
* @author ding.lid
* @see Host
* @see VirtualDnsException
*/
public class VirtualDns {
private static final long NEVER_EXPIRATION = Long.MAX_VALUE;
public static void setVirtualDns(String host, String... ips) {
try {
InetAddressCacheUtil.setInetAddressCache(host, ips, NEVER_EXPIRATION);
} catch (Exception e) {
throw new VirtualDnsException("Fail to setVirtualDns, cause: " + e.toString(), e);
}
}
public static void setVirtualDns(long expireMillis, String host, String... ips) {
try {
InetAddressCacheUtil.setInetAddressCache(host, ips, System.currentTimeMillis() + expireMillis);
} catch (Exception e) {
throw new VirtualDnsException("Fail to setVirtualDns, cause: " + e.toString(), e);
}
}
public static void setVirtualDns(Properties properties) {
for (Map.Entry<Object, Object> entry : properties.entrySet()) {
final String host = (String) entry.getKey();
final String ip = (String) entry.getValue();
setVirtualDns(host, ip);
}
}
public static void configVirtualDnsByClassPathProperties() {
configVirtualDnsByClassPathProperties("vdns.properties");
}
public static void configVirtualDnsByClassPathProperties(String propertiesFileOnClassPath) {
InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(propertiesFileOnClassPath);
if (inputStream == null) {
inputStream = VirtualDns.class.getClassLoader().getResourceAsStream(propertiesFileOnClassPath);
}
if (inputStream == null) {
throw new VirtualDnsException("Fail to find " + propertiesFileOnClassPath + " on classpath!");
}
try {
Properties properties = new Properties();
properties.load(inputStream);
inputStream.close();
setVirtualDns(properties);
} catch (Exception e) {
throw new VirtualDnsException("Fail to configVirtualDnsByClassPathProperties, cause: " + e.toString(), e);
}
}
public static List<Host> getAllVirtualDns() {
try {
return InetAddressCacheUtil.listAllVirtualDns();
} catch (Exception e) {
throw new VirtualDnsException("Fail to getAllVirtualDns, cause: " + e.toString(), e);
}
}
}

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src/main/java/com/oldratlee/vdns/VirtualDnsException.java Normal file
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package com.oldratlee.vdns;
/**
* @author ding.lid
*/
public class VirtualDnsException extends RuntimeException {
private static final long serialVersionUID = -7843069964883320844L;
public VirtualDnsException(String message) {
super(message);
}
public VirtualDnsException(String message, Throwable cause) {
super(message, cause);
}
}

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src/main/java/com/oldratlee/vdns/internal/InetAddressCacheUtil.java Normal file
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package com.oldratlee.vdns.internal;
import com.oldratlee.vdns.Host;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
/**
* @author ding.lid
*/
public class InetAddressCacheUtil {
public static void setInetAddressCache(String host, String[] ips, long expiration)
throws NoSuchMethodException, UnknownHostException,
IllegalAccessException, InstantiationException, InvocationTargetException,
ClassNotFoundException, NoSuchFieldException {
Object entry = createCacheEntry(host, ips, expiration);
synchronized (getAddressCacheFieldOfInetAddress()) {
getCacheFiledOfInetAddress$CacheEntry().put(host, entry);
}
}
static Object createCacheEntry(String host, String[] ips, long expiration)
throws UnknownHostException, ClassNotFoundException, NoSuchMethodException,
IllegalAccessException, InvocationTargetException, InstantiationException {
String className = "java.net.InetAddress$CacheEntry";
Class<?> clazz = Class.forName(className);
Constructor<?> constructor = clazz.getDeclaredConstructor(InetAddress[].class, long.class);
constructor.setAccessible(true);
return constructor.newInstance(toInetAddressArray(host, ips), expiration);
}
@SuppressWarnings("unchecked")
static Map<String, Object> getCacheFiledOfInetAddress$CacheEntry()
throws NoSuchFieldException, IllegalAccessException {
final Object inetAddressCache = getAddressCacheFieldOfInetAddress();
Class clazz = inetAddressCache.getClass();
final Field cacheMapField = clazz.getDeclaredField("cache");
cacheMapField.setAccessible(true);
return (Map<String, Object>) cacheMapField.get(inetAddressCache);
}
static volatile Object ADDRESS_CACHE = null;
@SuppressWarnings("unchecked")
static Object getAddressCacheFieldOfInetAddress()
throws NoSuchFieldException, IllegalAccessException {
if (ADDRESS_CACHE == null) {
synchronized (InetAddressCacheUtil.class) {
final Field cacheField = InetAddress.class.getDeclaredField("addressCache");
cacheField.setAccessible(true);
ADDRESS_CACHE = cacheField.get(InetAddress.class);
}
}
return ADDRESS_CACHE;
}
static InetAddress[] toInetAddressArray(String host, String[] ips) throws UnknownHostException {
InetAddress[] addresses = new InetAddress[ips.length];
for (int i = 0; i < addresses.length; i++) {
addresses[i] = InetAddress.getByAddress(host, ip2ByteArray(ips[i]));
}
return addresses;
}
private static Pattern PATTERN_DOT = Pattern.compile("\\.");
static byte[] ip2ByteArray(String ip) {
final String[] ipParts = PATTERN_DOT.split(ip); // FIXME check ip validation
byte[] address = new byte[ipParts.length];
for (int i = 0; i < ipParts.length; i++) {
address[i] = (byte) Integer.parseInt(ipParts[i]);
}
return address;
}
public static List<Host> listAllVirtualDns() throws NoSuchFieldException, IllegalAccessException {
List<Host> list = new ArrayList<Host>();
final Map<String, Object> cache;
synchronized (getAddressCacheFieldOfInetAddress()) {
cache = new HashMap<String, Object>(getCacheFiledOfInetAddress$CacheEntry());
}
for (Map.Entry<String, Object> entry : cache.entrySet()) {
list.addAll(cacheEntry2Host(entry.getValue()));
}
return list;
}
static List<Host> cacheEntry2Host(Object entry) throws NoSuchFieldException, IllegalAccessException {
Class<?> cacheEntryClazz = entry.getClass();
Field expirationField = cacheEntryClazz.getDeclaredField("expiration");
expirationField.setAccessible(true);
long expiration = (Long) expirationField.get(entry);
Field addressesField = cacheEntryClazz.getDeclaredField("addresses");
addressesField.setAccessible(true);
InetAddress[] addresses = (InetAddress[]) addressesField.get(entry);
List<Host> hosts = new ArrayList<Host>();
for (InetAddress address : addresses) {
Host host = new Host(address.getHostName(),
address.getHostAddress(), new Date(expiration));
hosts.add(host);
}
return hosts;
}
}

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package com.oldratlee.vdns;
import org.apache.commons.io.IOUtils;
import java.net.Socket;
/**
* @author ding.lid
*/
public class SocketDemo {
public static void main(String[] args) throws Exception {
new Socket("www.qq.com", 80);
Socket client = new Socket("www.baidu.com", 80);
client.setSoTimeout(30 * 1000);
IOUtils.write("Hello world!", client.getOutputStream());
final String input = IOUtils.toString(client.getInputStream());
System.out.println(input);
System.out.println("bye!");
client.close();
}
}

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package com.oldratlee.vdns;
import org.junit.Test;
import java.net.InetAddress;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import static org.junit.Assert.assertEquals;
/**
* @author ding.lid
*/
public class VirtualDnsTest {
@Test
public void test_configVirtualDnsByClassPathProperties() throws Exception {
VirtualDns.configVirtualDnsByClassPathProperties();
final String ip = InetAddress.getByName("www.hello-world.com").getHostAddress();
assertEquals("42.42.41.41", ip);
}
@Test
public void test_getAllVirtualDns() throws Exception {
VirtualDns.configVirtualDnsByClassPathProperties();
final List<Host> allVirtualDns = VirtualDns.getAllVirtualDns();
final List<Host> expected = Arrays.asList(new Host("www.hello-world.com", "42.42.41.41", new Date(Long.MAX_VALUE)));
assertEquals(expected, allVirtualDns);
}
@Test(expected = VirtualDnsException.class)
public void test_configNotFound() throws Exception {
VirtualDns.configVirtualDnsByClassPathProperties("not-existed.properties");
}
}

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src/test/java/com/oldratlee/vdns/internal/InetAddressCacheUtilTest.java Normal file
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package com.oldratlee.vdns.internal;
/**
* @author ding.lid
*/
public class InetAddressCacheUtilTest {
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %5p %t %l: %m%n"/>
</layout>
</appender>
<root>
<level value="INFO"/>
<appender-ref ref="CONSOLE"/>
</root>
</log4j:configuration>

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www.hello-world.com=42.42.41.41