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Camel DNS support
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/*
 * 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.camel.component.dns;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.support.DefaultProducer;
import org.xbill.DNS.DClass;
import org.xbill.DNS.Message;
import org.xbill.DNS.Name;
import org.xbill.DNS.Record;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.Type;

/**
 * A producer for dig-like operations over DNS adresses.
 * 
 * Inspired from Dig.java coming with the distribution of dnsjava, though most if not all options are unsupported.
 */
public class DnsDigProducer extends DefaultProducer {

    public DnsDigProducer(Endpoint endpoint) {
        super(endpoint);
    }

    @Override
    public void process(Exchange exchange) throws Exception {
        String server = exchange.getIn().getHeader(DnsConstants.DNS_SERVER, String.class);

        SimpleResolver resolver = new SimpleResolver(server);
        int type = Type.value(exchange.getIn().getHeader(DnsConstants.DNS_TYPE, String.class));
        if (type == -1) {
            // default: if unparsable value given, use A.
            type = Type.A;
        }

        String dclassValue = exchange.getIn().getHeader(DnsConstants.DNS_CLASS, String.class);
        if (dclassValue == null) {
            dclassValue = "";
        }

        int dclass = DClass.value(dclassValue);
        if (dclass == -1) {
            // by default, value is IN.
            dclass = DClass.IN;
        }

        Name name = Name.fromString(exchange.getIn().getHeader(DnsConstants.DNS_NAME, String.class), Name.root);
        Record rec = Record.newRecord(name, type, dclass);
        Message query = Message.newQuery(rec);
        Message response = resolver.send(query);
        exchange.getIn().setBody(response);
    }
}