org.xbill.DNS.ReverseMap Java Examples

The following examples show how to use org.xbill.DNS.ReverseMap. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: DNSLookupService.java From openvisualtraceroute with GNU Lesser General Public License v3.0

6 votes

/**
 * 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;
}

Example #2

Source File: DNSJavaService.java From james-project with Apache License 2.0

6 votes

@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();
    }
}

Example #3

Source File: Helperfunctions.java From open-rmbt with Apache License 2.0

6 votes

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;
}

Example #4

Source File: IpAddressUtil.java From megatron-java with Apache License 2.0

6 votes

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;
}

Example #5

Source File: DNSJavaNameService.java From Virtual-Hosts with GNU General Public License v3.0

5 votes

/**
 * 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();
}

Example #6

Source File: DNSJavaNameService.java From AndroidPNClient with Apache License 2.0

5 votes

/**
 * 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();
}

Example #7

Source File: DNSJavaNameService.java From dnsjava with BSD 2-Clause "Simplified" License

5 votes

/**
 * 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("Unknown address: " + name);
  }
  return ((PTRRecord) records[0]).getTarget().toString();
}

Example #8

Source File: IpAddressUtil.java From megatron-java with Apache License 2.0

5 votes

private static String reverseDnsLookupUsingDnsJavaExtendedResolver(long ipAddress) throws UnknownHostException {
    byte[] address = convertLongAddressToBuf(ipAddress);
    Name name = ReverseMap.fromAddress(InetAddress.getByAddress(address));
    Record[] records = new Lookup(name, Type.PTR).run();
    if (records == null) {
        throw new UnknownHostException();
    }
    String result = ((PTRRecord)records[0]).getTarget().toString();
    // remove trailing "."
    result = result.endsWith(".") ? result.substring(0, result.length() - 1) : result;
    return result;
}