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Minimal DNS library for java and android systems
There is a newer version: 0.2.4
/*
 * Copyright 2015-2016 the original author or authors
 *
 * This software is licensed under the Apache License, Version 2.0,
 * the GNU Lesser General Public License version 2 or later ("LGPL")
 * and the WTFPL.
 * You may choose either license to govern your use of this software only
 * upon the condition that you accept all of the terms of either
 * the Apache License 2.0, the LGPL 2.1+ or the WTFPL.
 */
package de.measite.minidns.record;

import de.measite.minidns.DNSName;
import de.measite.minidns.Record.TYPE;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 * SOA (start of authority) record payload.
 */
public class SOA extends Data {

    /**
     * The domain name of the name server that was the original or primary source of data for this zone.
     */
    public final DNSName mname;

    /**
     * A domain name which specifies the mailbox of the person responsible for this zone.
     */
    public final DNSName rname;

    /**
     * The unsigned 32 bit version number of the original copy of the zone.  Zone transfers preserve this value.  This
     * value wraps and should be compared using sequence space arithmetic.
     */
    public final long /* unsigned int */ serial;

    /**
     * A 32 bit time interval before the zone should be refreshed.
     */
    public final int refresh;

    /**
     * A 32 bit time interval that should elapse before a failed refresh should be retried.
     */
    public final int retry;

    /**
     * A 32 bit time value that specifies the upper limit on the time interval that can elapse before the zone is no
     * longer authoritative.
     */
    public final int expire;

    /**
     * The unsigned 32 bit minimum TTL field that should be exported with any RR from this zone.
     */
    public final long /* unsigned int */ minimum;

    public static SOA parse(DataInputStream dis, byte[] data)
            throws IOException {
        DNSName mname = DNSName.parse(dis, data);
        DNSName rname = DNSName.parse(dis, data);
        long serial = dis.readInt() & 0xFFFFFFFFL;
        int refresh = dis.readInt();
        int retry = dis.readInt();
        int expire = dis.readInt();
        long minimum = dis.readInt() & 0xFFFFFFFFL;
        return new SOA(mname, rname, serial, refresh, retry, expire, minimum);
    }

    public SOA(String mname, String rname, long serial, int refresh, int retry, int expire, long minimum) {
        this(DNSName.from(mname), DNSName.from(rname), serial, refresh, retry, expire, minimum);
    }

    public SOA(DNSName mname, DNSName rname, long serial, int refresh, int retry, int expire, long minimum) {
        this.mname = mname;
        this.rname = rname;
        this.serial = serial;
        this.refresh = refresh;
        this.retry = retry;
        this.expire = expire;
        this.minimum = minimum;
    }

    @Override
    public TYPE getType() {
        return TYPE.SOA;
    }

    @Override
    public void serialize(DataOutputStream dos) throws IOException {
        mname.writeToStream(dos);
        rname.writeToStream(dos);
        dos.writeInt((int) serial);
        dos.writeInt(refresh);
        dos.writeInt(retry);
        dos.writeInt(expire);
        dos.writeInt((int) minimum);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder()
                .append(mname).append(". ")
                .append(rname).append(". ")
                .append(serial).append(' ')
                .append(refresh).append(' ')
                .append(retry).append(' ')
                .append(expire).append(' ')
                .append(minimum);
        return sb.toString();
    }
}