org.xbill.DNS.Record Java Examples

@Override
protected List<String> fetch() {

  try {
    Resolver resolver = new SimpleResolver();
    // dns resolvers may take a long time to return a response.
    resolver.setTimeout(timeout);
    Lookup l =
        new Lookup(StringUtils.endsWith(hostname, ".") ? hostname : hostname + ".", Type.TXT);
    // always make sure the cache is empty
    l.setCache(new Cache());
    l.setResolver(resolver);
    Record[] records = l.run();
    if (records != null && records.length > 0) {
      return parse(records[0]);
    }
  } catch (Exception e) {
    log.error("Problem while adding Google resolvers, continue without", e);
  }

  log.error("No Google resolver addresses found");
  return Collections.emptyList();
}
 

private static String reverseDnsLookupUsingDnsJavaSimpleResolver(long ipAddress) throws IOException {
    String result = null;
    byte[] address = convertLongAddressToBuf(ipAddress);
    Name name = ReverseMap.fromAddress(InetAddress.getByAddress(address));
    Record record = Record.newRecord(name, Type.PTR, DClass.IN);
    Message query = Message.newQuery(record);
    Message response = simpleResolver.send(query);
    Record[] answers = response.getSectionArray(Section.ANSWER);
    if (answers.length != 0) {
        // If PTR-record exists this will be at index 1 or above (more than one PTR-record may exist)
        Record answer = (answers.length > 1) ? answers[1] : answers[0];  
        result = answer.rdataToString();
        // remove trailing "."
        result = result.endsWith(".") ? result.substring(0, result.length() - 1) : result;
    } else {
        throw new IOException("Empty DNS response.");
    }
    return result;
}
 

private List<String> parse(Record record) {
  TXTRecord txt = (TXTRecord) record;
  List<String> subnets = new ArrayList<>();

  @SuppressWarnings("unchecked")
  List<String> lines = txt.getStrings();
  for (String line : lines) {
    String[] parts = StringUtils.split(line, " ");
    if (parts.length == 2) {
      if (log.isDebugEnabled()) {
        log.debug("Add Google resolver IP range: " + parts[0]);
      }
      subnets.add(parts[0]);
    }
  }

  if (subnets.isEmpty()) {
    log.error("No Google resolver addresses found");
  }

  return subnets;
}
 

/**
 * Dns lookup more efficient than the INetAddress.getHostName(ip)
 *
 * @param hostIp
 * @return
 * @throws IOException
 */
public String dnsLookup(final String hostIp) {
	try {
		final Name name = ReverseMap.fromAddress(hostIp);
		final int type = Type.PTR;
		final int dclass = DClass.IN;
		final Record rec = Record.newRecord(name, type, dclass);
		final Message query = Message.newQuery(rec);

		final Message response = _resolver.send(query);

		final Record[] answers = response.getSectionArray(Section.ANSWER);
		if (answers.length > 0) {
			String ret = answers[0].rdataToString();
			if (ret.endsWith(".")) {
				ret = ret.substring(0, ret.length() - 1);
			}
			return ret;
		}
	} catch (final IOException e) {
		LOGGER.warn("Failed to resolve hostname for " + hostIp, e);
	}
	return UNKNOWN_HOST;
}
 

private Message
sendAXFR(Message query) throws IOException {
    Name qname = query.getQuestion().getName();
    ZoneTransferIn xfrin = ZoneTransferIn.newAXFR(qname, address, tsig);
    xfrin.setTimeout((int)(getTimeout() / 1000));
    xfrin.setLocalAddress(localAddress);
    try {
        xfrin.run();
    }
    catch (ZoneTransferException e) {
        throw new WireParseException(e.getMessage());
    }
    List records = xfrin.getAXFR();
    Message response = new Message(query.getHeader().getID());
    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);
    return response;
}
 

/**
 * Query a text record for the given domain from DNS
 * 
 * @param domain the domain to lookup the DNS for a text record
 * @return       the text record content, if found, null otherwise
 */
@SuppressWarnings ("unchecked")
public String queryText (String domain) {
	String		rc = null;
	Record[]	r = query (domain, Type.TXT);
	
	if (r != null) {
		rc = "";
		for (int n = 0; n < r.length; ++n) {
			List <String>	answ = ((TXTRecord) r[n]).getStrings ();
			
			for (int m = 0; m < answ.size (); ++m) {
				String	s = answ.get (m);
				
				if ((s != null) && (s.length () > 0)) {
					rc += s;
				}
			}
		}
	}
	return rc;
}
 

@Override
public InetAddress getByName(String host) throws UnknownHostException {
    TimeMetric timeMetric = metricFactory.timer("getByName");
    String name = allowIPLiteral(host);

    try {
        // Check if its local
        if (name.equalsIgnoreCase(localHostName) || name.equalsIgnoreCase(localCanonicalHostName) || name.equals(localAddress)) {
            return getLocalHost();
        }

        return org.xbill.DNS.Address.getByAddress(name);
    } catch (UnknownHostException e) {
        Record[] records = lookupNoException(name, Type.A, "A");

        if (records != null && records.length >= 1) {
            ARecord a = (ARecord) records[0];
            return InetAddress.getByAddress(name, a.getAddress().getAddress());
        } else {
            throw e;
        }
    } finally {
        timeMetric.stopAndPublish();
    }
}
 

@Override
public Collection<String> findTXTRecords(String hostname) {
    TimeMetric timeMetric = metricFactory.timer("findTXTRecords");
    List<String> txtR = new ArrayList<>();
    Record[] records = lookupNoException(hostname, Type.TXT, "TXT");

    try {
        if (records != null) {
            for (Record record : records) {
                TXTRecord txt = (TXTRecord) record;
                txtR.add(txt.rdataToString());
            }

        }
        return txtR;
    } finally {
        timeMetric.stopAndPublish();
    }
}
 

@Override
public String getHostName(InetAddress addr) {
    TimeMetric timeMetric = metricFactory.timer("getHostName");
    String result;
    Name name = ReverseMap.fromAddress(addr);
    Record[] records = lookupNoException(name.toString(), Type.PTR, "PTR");

    try {
        if (records == null) {
            result = addr.getHostAddress();
        } else {
            PTRRecord ptr = (PTRRecord) records[0];
            result = ptr.getTarget().toString();
        }
        return result;
    } finally {
        timeMetric.stopAndPublish();
    }
}
 

@Override
public List<LookupResult> resolve(final String fqdn) {
  Lookup lookup = lookupFactory.forName(fqdn);
  Record[] queryResult = lookup.run();

  switch (lookup.getResult()) {
    case Lookup.SUCCESSFUL:
      return toLookupResults(queryResult);
    case Lookup.HOST_NOT_FOUND:
      // fallthrough
    case Lookup.TYPE_NOT_FOUND:
      LOG.warn("No results returned for query '{}'; result from XBill: {} - {}",
          fqdn, lookup.getResult(), lookup.getErrorString());
      return ImmutableList.of();
    default:
      throw new DnsException(
          String.format("Lookup of '%s' failed with code: %d - %s ",
              fqdn, lookup.getResult(), lookup.getErrorString()));
  }
}
 

private static List<LookupResult> toLookupResults(Record[] queryResult) {
  ImmutableList.Builder<LookupResult> builder = ImmutableList.builder();

  if (queryResult != null) {
    for (Record record: queryResult) {
      if (record instanceof SRVRecord) {
        SRVRecord srvRecord = (SRVRecord) record;
        builder.add(LookupResult.create(srvRecord.getTarget().toString(),
                                        srvRecord.getPort(),
                                        srvRecord.getPriority(),
                                        srvRecord.getWeight(),
                                        srvRecord.getTTL()));
      }
    }
  }

  return builder.build();
}
 

private Message messageWithNodes(String query, String[] names) throws TextParseException {
  Name queryName = Name.fromString(query);
  Record question = Record.newRecord(queryName, Type.SRV, DClass.IN);
  Message queryMessage = Message.newQuery(question);
  Message result = new Message();
  result.setHeader(queryMessage.getHeader());
  result.addRecord(question, Section.QUESTION);

  for (String name1 : names) {
    result.addRecord(
        new SRVRecord(queryName, DClass.IN, 1, 1, 1, 8080, Name.fromString(name1)),
        Section.ANSWER);
  }

  return result;
}
 

private String concatenateTxtRecordValues(Record[] records) {
    if (records == null || records.length == 0)
        return null;
    StringBuilder builder = new StringBuilder();
    for (Record record : records) {
        TXTRecord txtRecord = (TXTRecord) record;
        if (builder.length() != 0)
            builder.append(EOL);
        for (Object string : txtRecord.getStrings()) {
            if (builder.length() != 0)
                builder.append(EOL);
            builder.append(string);
        }
    }
    return builder.toString();
}
 

@Test
public void testQueryAddresses() throws SendException {
    new Expectations() {
        {
            lookup.run();
            result =
                    new Record[] {
                            new ARecord(HOST1_EXAMPLE_COM_NAME, 0, 0, IP1),
                            new ARecord(HOST1_EXAMPLE_COM_NAME, 0, 0, IP2)

                    };

        }
    };

    InetAddress[] addresses =
            addressLookup.queryAddresses(HOST1_EXAMPLE_COM_NAME);

    InetAddress[] expected = new InetAddress[] { IP1, IP2 };
    assertArrayEquals(expected, addresses);
}
 

@Test
public void testQueryAddressesIpv6() throws SendException {
    new Expectations() {
        {
            lookup.run();
            result =
                    new Record[] { new AAAARecord(HOST6_EXAMPLE_COM_NAME,
                            0, 0, IPV6)

                    };

        }
    };

    InetAddress[] addresses =
            addressLookup.queryAddresses(HOST1_EXAMPLE_COM_NAME);

    InetAddress[] expected = new InetAddress[] { IPV6 };
    assertArrayEquals(expected, addresses);
}
 

Record parseRR(Tokenizer st, int classValue, long TTLValue) throws IOException {
  Name name = st.getName(zone);
  long ttl;
  int type;

  String s = st.getString();

  try {
    ttl = TTL.parseTTL(s);
    s = st.getString();
  } catch (NumberFormatException e) {
    ttl = TTLValue;
  }

  if (DClass.value(s) >= 0) {
    classValue = DClass.value(s);
    s = st.getString();
  }

  if ((type = Type.value(s)) < 0) {
    throw new IOException("Invalid type: " + s);
  }

  return Record.fromString(name, type, classValue, ttl, st, zone);
}
 

void doProhibit(Tokenizer st) throws IOException {
  Tokenizer.Token token;
  Name name;
  Record record;
  int type;

  name = st.getName(zone);
  token = st.get();
  if (token.isString()) {
    if ((type = Type.value(token.value)) < 0) {
      throw new IOException("Invalid type: " + token.value);
    }
  } else {
    type = Type.ANY;
  }
  record = Record.newRecord(name, type, DClass.NONE, 0);
  query.addRecord(record, Section.PREREQ);
  print(record);
}
 

static void doAXFR(Message response) {
  System.out.println("; java dig 0.0 <> " + name + " axfr");
  if (response.isSigned()) {
    System.out.print(";; TSIG ");
    if (response.isVerified()) {
      System.out.println("ok");
    } else {
      System.out.println("failed");
    }
  }

  if (response.getRcode() != Rcode.NOERROR) {
    System.out.println(response);
    return;
  }

  for (Record record : response.getSection(Section.ANSWER)) {
    System.out.println(record);
  }

  System.out.print(";; done (");
  System.out.print(response.getHeader().getCount(Section.ANSWER));
  System.out.print(" records, ");
  System.out.print(response.getHeader().getCount(Section.ADDITIONAL));
  System.out.println(" additional)");
}
 

public <T extends Record> RRset findExactMatch(Name name, int type, int dclass, boolean glue) {
  Zone zone = findBestZone(name);
  if (zone != null) {
    return zone.findExactMatch(name, type);
  } else {
    List<RRset> rrsets;
    Cache cache = getCache(dclass);
    if (glue) {
      rrsets = cache.findAnyRecords(name, type);
    } else {
      rrsets = cache.findRecords(name, type);
    }
    if (rrsets == null) {
      return null;
    } else {
      return rrsets.get(0); /* not quite right */
    }
  }
}
 

public static List<ForwardLookupResult> getARecord(String hostName, String domainName) throws TextParseException {
    List<ForwardLookupResult> entries = null;
    if (hostName != null && !hostName.isEmpty() && domainName != null && !domainName.isEmpty()) {
        Record[] recs = new Lookup(hostName, Type.A).run();
        if (recs != null) {
            if (recs.length > 0) {
                entries = new ArrayList<>();
                for (Record record : recs) {
                    ForwardLookupResult foundSubDomain = new ForwardLookupResult(domainName);
                    foundSubDomain.setHostName(hostName);
                    String ipAddress = ((ARecord) record).getAddress().getHostAddress();
                    foundSubDomain.setIpAddress(ipAddress);
                    foundSubDomain.setLookupType("A");
                    entries.add(foundSubDomain);
                }
            }
        }
    }
    return entries;
}
 

public static List<ForwardLookupResult> getAAAARecord(String hostName, String domainName) throws TextParseException {
    List<ForwardLookupResult> entries = null;
    if (hostName != null && !hostName.isEmpty() && domainName != null && !domainName.isEmpty()) {
        Record[] recs = new Lookup(hostName, Type.AAAA).run();
        if (recs != null) {
            if (recs.length > 0) {
                entries = new ArrayList<>();
                for (Record record : recs) {
                    ForwardLookupResult foundSubDomain = new ForwardLookupResult(domainName);
                    foundSubDomain.setHostName(hostName);
                    String ipAddress = ((AAAARecord) record).getAddress().getHostAddress();
                    foundSubDomain.setIpAddress(ipAddress);
                    foundSubDomain.setLookupType("A");
                    entries.add(foundSubDomain);
                }
            }
        }
    }
    return entries;
}
 

public static List<ARecordResult> getARecord(String hostName) throws TextParseException {
    List<ARecordResult> entries = null;

    Record[] recs = new Lookup(hostName, Type.A).run();
    if (recs != null) {
        if (recs.length > 0) {
            entries = new ArrayList<>();
            for (Record record : recs) {
                ARecordResult foundSubDomain = new ARecordResult(NetworkTools.getDomainFromHost(hostName));
                foundSubDomain.setHostName(hostName);
                String ipAddress = ((ARecord) record).getAddress().getHostAddress();
                foundSubDomain.setIpAddress(ipAddress);
                foundSubDomain.setLookupType("A");
                entries.add(foundSubDomain);
            }
        }
    }

    return entries;
}
 

public static String getDomainFromHost(String host) {
    String tmpHost = host;
    if (host.isEmpty()) {
        return "";
    }
    while (true) {
        try {
            if (!tmpHost.startsWith("www.")) {
                Record[] recs = new Lookup(tmpHost, Type.SOA).run();
                if (recs != null) {
                    return tmpHost;
                }
            }
            if (tmpHost.contains(".")) {
                tmpHost = tmpHost.split("\\.", 2)[1];
            } else {
                break;
            }
        } catch (TextParseException ex) {
            Logger.getLogger("networkTools.getDomainFromHost").log(Level.SEVERE, null, ex);
            break;
        }
    }
    return "";
}
 

public List<ARecordResult> getARecord(String hostName) throws TextParseException {
    List<ARecordResult> entries = null;

    Record[] recs = new Lookup(hostName, Type.A).run();
    if (recs != null) {
        if (recs.length > 0) {
            entries = new ArrayList<>();
            for (Record record : recs) {
                ARecordResult foundSubDomain = new ARecordResult(NetworkTools.getDomainFromHost(hostName));
                foundSubDomain.setHostName(hostName);
                String ipAddress = ((ARecord) record).getAddress().getHostAddress();
                foundSubDomain.setIpAddress(ipAddress);
                foundSubDomain.setLookupType("A");
                entries.add(foundSubDomain);
            }
        }
    }

    return entries;
}
 

static void	doAXFR(Message response) throws IOException {
	System.out.println("; java dig 0.0 <> " + name + " axfr");
	if (response.isSigned()) {
		System.out.print(";; TSIG ");
		if (response.isVerified())
			System.out.println("ok");
		else
			System.out.println("failed");
	}

	if (response.getRcode() != Rcode.NOERROR) {
		System.out.println(response);
		return;
	}

	Record [] records = response.getSectionArray(Section.ANSWER);
	for (int i = 0; i < records.length; i++)
		System.out.println(records[i]);

	System.out.print(";; done (");
	System.out.print(response.getHeader().getCount(Section.ANSWER));
	System.out.print(" records, ");
	System.out.print(response.getHeader().getCount(Section.ADDITIONAL));
	System.out.println(" additional)");
}
 

public static String reverseDNSLookup(final InetAddress adr)
{
    try
    {
        final Name name = ReverseMap.fromAddress(adr);
        
        final Lookup lookup = new Lookup(name, Type.PTR);
        lookup.setResolver(new SimpleResolver());
        lookup.setCache(null);
        final Record[] records = lookup.run();
        if (lookup.getResult() == Lookup.SUCCESSFUL)
            for (final Record record : records)
                if (record instanceof PTRRecord)
                {
                    final PTRRecord ptr = (PTRRecord) record;
                    return ptr.getTarget().toString();
                }
    }
    catch (final Exception e)
    {
    }
    return null;
}
 

@Test
public void testDnsProducer() throws Exception {
    CamelContext camelctx = new DefaultCamelContext();
    camelctx.addRoutes(new RouteBuilder() {
        @Override
        public void configure() throws Exception {
            from("direct:start")
            .to("dns:lookup");
        }
    });

    camelctx.start();
    try {
        ProducerTemplate producer = camelctx.createProducerTemplate();
        Record[] record = producer.requestBodyAndHeader("direct:start", null, DnsConstants.DNS_NAME, "redhat.com", Record[].class);

        Assert.assertEquals("redhat.com.", record[0].getName().toString());
        Assert.assertEquals(Type.A, record[0].getType());
    } catch (CamelExecutionException ex) {
        Throwable cause = ex.getCause();
        Assert.assertEquals("network error", cause.getMessage());
    } finally {
        camelctx.close();
    }
}
 

public static void printAnswer(String name, Lookup lookup) {
  System.out.print(name + ":");
  int result = lookup.getResult();
  if (result != Lookup.SUCCESSFUL) {
    System.out.print(" " + lookup.getErrorString());
  }
  System.out.println();
  Name[] aliases = lookup.getAliases();
  if (aliases.length > 0) {
    System.out.print("# aliases: ");
    for (int i = 0; i < aliases.length; i++) {
      System.out.print(aliases[i]);
      if (i < aliases.length - 1) {
        System.out.print(" ");
      }
    }
    System.out.println();
  }
  if (lookup.getResult() == Lookup.SUCCESSFUL) {
    Record[] answers = lookup.getAnswers();
    for (Record answer : answers) {
      System.out.println(answer);
    }
  }
}
 

public void expandDomain(String domainToCheck) throws TextParseException {
    String domainName = null;

    // Check for domain name alias - CNAME
    Record[] recs = new Lookup(domainToCheck, Type.CNAME).run();
    if (recs != null && recs.length != 0) {
        domainName = ((CNAMERecord) recs[0]).getName().canonicalize().toString(true);
        Log.debug("Found: " + domainName + "CNAME rec: " + domainName);
    }

    // Now get the SOA record that would signify a domain exists
    recs = new Lookup(domainToCheck, Type.SOA).run();
    for (int idx = 0; idx < retryCount; idx++) {
        if (recs != null) {
            if (domainName == null) {
                domainName = ((SOARecord) recs[0]).getName().canonicalize().toString(true);
                Log.debug("Found: " + domainName + " SOA rec: " + domainName);
            }

            DomainResult newDomain = new DomainResult(domainName);
            newDomain.setNameServer(((SOARecord) recs[0]).getHost().toString(true));
            newDomain.setAdminName(((SOARecord) recs[0]).getAdmin().toString(true));
            String name = domainToCheck.split("\\.", 2)[0];
            String tld = domainToCheck.split("\\.", 2)[1];
            newDomain.setRegistrant(NetworkTools.getHostNameWhoisResult(name, tld, true));
            Map<String, String> attrs = new HashMap<>();
            attrs.put(DataStore.DNS_RECORD, DataStore.SOA);
            newDomain.setAttributes(attrs);
            addResult(newDomain);
            break;
        }
    }
}
 

/**
 * Performs a reverse DNS lookup.
 * @param addr The ip address to lookup.
 * @return The host name found for the ip address.
 */
public String
getHostByAddr(byte [] addr) throws UnknownHostException {
	Name name = ReverseMap.fromAddress(InetAddress.getByAddress(addr));
	Record [] records = new Lookup(name, Type.PTR).run();
	if (records == null)
		throw new UnknownHostException();
	return ((PTRRecord) records[0]).getTarget().toString();
}