Github user trixpan commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/496#discussion_r72596621
  
    --- Diff: 
nifi-nar-bundles/nifi-enrich-bundle/nifi-enrich-processors/src/main/java/org/apache/nifi/processors/enrich/QueryDNS.java
 ---
    @@ -0,0 +1,269 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.nifi.processors.enrich;
    +
    +import java.util.ArrayList;
    +import java.util.Collections;
    +import java.util.HashSet;
    +import java.util.Hashtable;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import javax.naming.Context;
    +import javax.naming.NameNotFoundException;
    +import javax.naming.NamingEnumeration;
    +import javax.naming.NamingException;
    +import javax.naming.directory.Attributes;
    +import javax.naming.directory.BasicAttributes;
    +import javax.naming.directory.DirContext;
    +import javax.naming.directory.InitialDirContext;
    +
    +import org.apache.commons.lang3.StringUtils;
    +
    +import org.apache.nifi.annotation.behavior.EventDriven;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.SideEffectFree;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.behavior.WritesAttribute;
    +import org.apache.nifi.annotation.behavior.WritesAttributes;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.StandardValidators;
    +
    +
    +@EventDriven
    +@SideEffectFree
    +@SupportsBatching
    +@Tags({"dns", "enrich", "ip"})
    +@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
    +@CapabilityDescription("A powerful DNS query processor primary designed to 
enrich DataFlows with DNS based APIs " +
    +        "(e.g. RBLs, ShadowServer's ASN lookup) but that can be also used 
to perform regular DNS lookups.")
    +@WritesAttributes({
    +        @WritesAttribute(attribute = "enrich.dns.record*.group*", 
description = "The captured fields of the DNS query response for each of the 
records received"),
    +})
    +public class QueryDNS extends AbstractEnrichProcessor {
    +
    +    public static final PropertyDescriptor DNS_QUERY_TYPE = new 
PropertyDescriptor.Builder()
    +            .name("DNS Query Type")
    +            .description("The DNS query type to be used by the processor 
(e.g. TXT, A)")
    +            .required(true)
    +            .defaultValue("TXT")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor DNS_SERVER = new 
PropertyDescriptor.Builder()
    +            .name("DNS Servers")
    +            .description("A comma separated list of  DNS servers to be 
used. (Defaults to system wide if none is used)")
    +            .required(false)
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor DNS_TIMEOUT = new 
PropertyDescriptor.Builder()
    +            .name("DNS Query Timeout")
    +            .description("The amount of milliseconds to wait until 
considering a query as failed")
    +            .required(true)
    +            .defaultValue("1500")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor DNS_RETRIES = new 
PropertyDescriptor.Builder()
    +            .name("DNS Query Retries")
    +            .description("The number of attempts before giving up and 
moving on")
    +            .required(true)
    +            .defaultValue("1")
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +
    +    private final static List<PropertyDescriptor> propertyDescriptors;
    +    private final static Set<Relationship> relationships;
    +
    +    private DirContext ictx;
    +
    +    // Assign the default and generally used contextFactory value
    +    private String contextFactory = 
com.sun.jndi.dns.DnsContextFactory.class.getName();;
    +
    +    static {
    +        List<PropertyDescriptor> props = new ArrayList<>();
    +        props.add(QUERY_INPUT);
    +        props.add(QUERY_PARSER);
    +        props.add(QUERY_PARSER_INPUT);
    +        props.add(DNS_RETRIES);
    +        props.add(DNS_TIMEOUT);
    +        props.add(DNS_SERVER);
    +        props.add(DNS_QUERY_TYPE);
    +        propertyDescriptors = Collections.unmodifiableList(props);
    +
    +        Set<Relationship> rels = new HashSet<>();
    +        rels.add(REL_FOUND);
    +        rels.add(REL_NOT_FOUND);
    +        relationships = Collections.unmodifiableSet(rels);
    +    }
    +
    +    private AtomicBoolean initialized;
    +
    +    @Override
    +    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
    +        return propertyDescriptors;
    +    }
    +
    +    @Override
    +    public Set<Relationship> getRelationships() {
    +        return relationships;
    +    }
    +
    +    @Override
    +    public void onTrigger(ProcessContext context, ProcessSession session) 
throws ProcessException {
    +        try {
    +          initializeResolver(context);
    +        } catch (Exception e) {
    +            context.yield();
    +            throw new ProcessException("Failed to initialize the JNDI DNS 
resolver server", e);
    +        }
    +
    +        FlowFile flowFile = session.get();
    +        if (flowFile == null) {
    +            return;
    +        }
    +
    +        final String queryType = 
context.getProperty(DNS_QUERY_TYPE).getValue();
    +        final String queryInput = 
context.getProperty(QUERY_INPUT).evaluateAttributeExpressions(flowFile).getValue();
    +        final String queryParser = 
context.getProperty(QUERY_PARSER).getValue();
    +        final String queryRegex = 
context.getProperty(QUERY_PARSER_INPUT).getValue();
    +        final String dnsServer = 
context.getProperty(DNS_SERVER).getValue();
    +
    +        boolean found = false;
    +        try {
    +            String initialResult = "";
    --- End diff --
    
    addressed


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