DNS BIND之dnsjava java客户端操作

dnsjava是DNS的一个Java实现。支持所有定义的记录类型包括DNSSEC类型，和未知类型。它还可以用于查询，区域传输，动态更新。dnsjava还包含一个客户端使用的缓存，一个小型DNS服务器。它支持TSIG身份验证的消息，部分DNSSEC验证和EDNS0。

dnsjava提供的DNS高和低级别的访问功能。高级别的功能进行查询，对于一​​个给定的名称，类型和类的记录，然后返回答案，或者失败原因。也有相似的功能，对于与InetAddress类。缓存是用来减少发送DNS查询的数量。低级别的功能允许直接操纵的DNS的消息和记录，以及允许额外解析器属性进行设置。除dnsjava外，还有一些其他的java实现如：dns4j，dnsjnio，jdnss,eagledns等

官网地址：http://www.dnsjava.org/

项目地址：http://sourceforge.net/projects/dnsjava/

maven依赖：http://mvnrepository.com/artifact/dnsjava/dnsjava

<dependency>
	<groupId>dnsjava</groupId>
	<artifactId>dnsjava</artifactId>
	<version>2.1.7</version>
</dependency>

实例参考：

package cn.slimsmart.java.demo.dnsjava;

import java.io.IOException;
import java.net.InetAddress;
import java.util.Iterator;
import java.util.List;

import org.xbill.DNS.ARecord;
import org.xbill.DNS.DClass;
import org.xbill.DNS.Flags;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Message;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.Resolver;
import org.xbill.DNS.Section;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.TSIG;
import org.xbill.DNS.Type;
import org.xbill.DNS.Update;
import org.xbill.DNS.ZoneTransferIn;

public class DNSJavaTest {

	public static void main(String[] args) throws Exception {
		// query();
		//transferZone();
		addRR();
	}

	// 查询
	static void query() throws IOException {
		Resolver resolver = new SimpleResolver("192.168.36.54");
		resolver.setPort(53);
		Lookup lookup = new Lookup("www.test.com", Type.A);
		lookup.setResolver(resolver);
		lookup.run();
		if (lookup.getResult() == Lookup.SUCCESSFUL) {
			System.out.println(lookup.getAnswers()[0].rdataToString());
		}
	}

	static void transferZone() throws Exception {
		ZoneTransferIn xfr = ZoneTransferIn.newAXFR(new Name("test.com."), "192.168.36.54", null);
		List records = xfr.run();
		Message response = new Message();
		response.getHeader().setFlag(Flags.AA);
		response.getHeader().setFlag(Flags.QR);
		// response.addRecord(query.getQuestion(),Section.QUESTION);
		Iterator it = records.iterator();
		while (it.hasNext()) {
			response.addRecord((Record) it.next(), Section.ANSWER);
		}
		System.out.println(response);
	}

	static void addRR() throws Exception {
		Name zone = Name.fromString("test.com.");
		Name host = Name.fromString("host", zone);
		Update update = new Update(zone, DClass.IN);
		Record record = new ARecord(host, DClass.IN, 3600, InetAddress.getByName("192.0.0.2"));
		update.add(record);
		Resolver resolver = new SimpleResolver("192.168.36.54");
		resolver.setPort(53);
		TSIG tsig = new TSIG("test_key", "epYaIl5VMJGRSG4WMeFW5g==");
		resolver.setTSIGKey(tsig);
		resolver.setTCP(true);
		Message response = resolver.send(update);
		System.out.println(response);
	}
}

检查添加结果：

$ dig @192.168.36.54 host.test.com

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6 <<>> @192.168.36.54 host.test.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19149
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;host.test.com.                 IN      A

;; ANSWER SECTION:
host.test.com.          3600    IN      A       192.0.0.2
host.test.com.          3600    IN      A       192.0.0.1

;; AUTHORITY SECTION:
test.com.               86400   IN      NS      dns.test.com.

;; ADDITIONAL SECTION:
dns.test.com.           86400   IN      A       192.168.36.189

;; Query time: 2 msec
;; SERVER: 192.168.36.54#53(192.168.36.54)
;; WHEN: Sun Apr 19 00:22:41 2015
;; MSG SIZE  rcvd: 97