JAva DNSドメイン名解析
4631 ワード
依存パッケージ:
dnsjava
dnsjava
2.1.8
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xbill.DNS.*;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import java.util.*;
/**
* @author xxy
*/
public class DnsUtils {
private static final Logger log = LoggerFactory.getLogger(DnsUtils.class);
public static void main(String[] args) {
String[] ipArray = {"156.238.169.163"};
List list = Arrays.asList(ipArray);
Set set = getDnsRealIp(list,"fig.cdn.com");
Iterator it = set.iterator();
while(it.hasNext()) {
System.out.println(it.next());
}
}
/**
* DNS ( )
*
* @param domain DNS
* @param provider DNS
* @param types "A"(IP ),"MX"
* @param timeout
* @param retryCount
*
* @return
*
* @throws NamingException
*
*/
@SuppressWarnings("rawtypes" )
public static ArrayList getDNSRecs(String domain, String provider,
String [] types, int timeout, int retryCount) throws NamingException {
ArrayList results = new ArrayList(15);
Hashtable env = new Hashtable();
env.put( "java.naming.factory.initial" ,
"com.sun.jndi.dns.DnsContextFactory" );
//
env.put(Context. PROVIDER_URL, "dns://" + provider);
//
env.put( "com.sun.jndi.dns.timeout.initial" , String.valueOf(timeout));
//
env.put( "com.sun.jndi.dns.timeout.retries" , String.valueOf(retryCount));
DirContext ictx = new InitialDirContext(env);
Attributes attrs = ictx.getAttributes(domain, types);
for (Enumeration e = attrs.getAll(); e.hasMoreElements();) {
Attribute a = (Attribute) e.nextElement();
int size = a.size();
for (int i = 0; i < size; i++) {
results.add((String) a.get(i));
}
}
return results;
}
/**
* IP( )
* @param domain
* @param dnsServers DNS
* @param timeout
* @param retryCount
* @return
*/
public static Set getAllIP(String domain, String[] dnsServers,
int timeout, int retryCount) {
Set ips = new HashSet();
for(String dnsServer: dnsServers) {
List ipList;
try {
ipList = getDNSRecs(domain, dnsServer, new String[]{"A"},
timeout, retryCount);
} catch (NamingException e) {
continue;
}
ips.addAll(ipList);
}
return ips;
}
/**
* IP( , )
* @param ipList dns IP
* @param dnsServerName dns
* @return
*/
public static Set getDnsRealIp(List ipList,String dnsServerName){
Set set = new HashSet<>();
try {
log.info("getDnsRealIp ipList==========>{}",ipList);
for(String ip : ipList) {
Resolver resolver = new SimpleResolver(ip);
Lookup lookup = new Lookup(dnsServerName, Type.A);
lookup.setResolver(resolver);
Cache cache = new Cache();
lookup.setCache(cache);
lookup.run();
if (lookup.getResult() == Lookup.SUCCESSFUL) {
Record[] records = lookup.getAnswers();
for (Record record : records) {
log.info("getDnsRealIp ip->{}, dsn-->{}",ip,record.toString());
set.add(record.rdataToString());
}
}
}
}catch (Exception e){
log.info("getDnsRealIp error=====>",e);
}
return set;
}
}