Initial commit

21 files changed, 2173 insertions, 0 deletions

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
new file mode 100644
index 00000000..6c9477d9
--- /dev/null
+++ b/AndroidManifest.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="de.measite.minidns"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="9"
+        android:targetSdkVersion="19" />
+
+    <application/>
+
+</manifest>
diff --git a/LICENCE b/LICENCE
new file mode 100644
index 00000000..4c2ee7c0
--- /dev/null
+++ b/LICENCE
@@ -0,0 +1,4 @@
+This software may be used under the terms of (at your choice)
+- LGPL version 2 (or later) (see LICENCE_LGPL2.1 for details)
+- Apache Software licence (see LICENCE_APACHE for details)
+- WTFPL (see LICENCE_WTFPL for details)
diff --git a/LICENCE_APACHE b/LICENCE_APACHE
new file mode 100644
index 00000000..e454a525
--- /dev/null
+++ b/LICENCE_APACHE
@@ -0,0 +1,178 @@
+
+                                 Apache License
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diff --git a/LICENCE_LGPL2.1 b/LICENCE_LGPL2.1
new file mode 100644
index 00000000..51a70cae
--- /dev/null
+++ b/LICENCE_LGPL2.1
@@ -0,0 +1,503 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
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+
+  11. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Library at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Library by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Library.
+
+If any portion of this section is held invalid or unenforceable under any
+particular circumstance, the balance of the section is intended to apply,
+and the section as a whole is intended to apply in other circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  12. If the distribution and/or use of the Library is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Library under this License may add
+an explicit geographical distribution limitation excluding those countries,
+so that distribution is permitted only in or among countries not thus
+excluded.  In such case, this License incorporates the limitation as if
+written in the body of this License.
+
+  13. The Free Software Foundation may publish revised and/or new
+versions of the Lesser General Public License from time to time.
+Such new versions will be similar in spirit to the present version,
+but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Library
+specifies a version number of this License which applies to it and
+"any later version", you have the option of following the terms and
+conditions either of that version or of any later version published by
+the Free Software Foundation.  If the Library does not specify a
+license version number, you may choose any version ever published by
+the Free Software Foundation.
+
+  14. If you wish to incorporate parts of the Library into other free
+programs whose distribution conditions are incompatible with these,
+write to the author to ask for permission.  For software which is
+copyrighted by the Free Software Foundation, write to the Free
+Software Foundation; we sometimes make exceptions for this.  Our
+decision will be guided by the two goals of preserving the free status
+of all derivatives of our free software and of promoting the sharing
+and reuse of software generally.
+
+                            NO WARRANTY
+
+  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
+WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
+EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
+OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
+KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
+LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
+THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
+WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
+AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
+FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
+CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
+LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
+RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
+FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
+SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+           How to Apply These Terms to Your New Libraries
+
+  If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change.  You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms of the
+ordinary General Public License).
+
+  To apply these terms, attach the following notices to the library.  It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the library's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!
+
diff --git a/LICENCE_WTFPL b/LICENCE_WTFPL
new file mode 100644
index 00000000..652d3783
--- /dev/null
+++ b/LICENCE_WTFPL
@@ -0,0 +1,13 @@
+        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+                    Version 2, December 2004 
+
+ Copyright (C) 2014 Rene Treffer <treffer+wtfpl@measite.de> 
+
+ Everyone is permitted to copy and distribute verbatim or modified 
+ copies of this license document, and changing it is allowed as long 
+ as the name is changed. 
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..99ba78b3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+MiniDNS
+-------
+
+MiniDNS is a minial dns client library for android. It can parse a basic set
+of resource records (A, AAAA, NS, SRV) and is easy to use and extend.
+
+This library is not intended to be used as a DNS server. You might want to
+look into dnsjava for such functionality.
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 00000000..2a17c6ae
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,34 @@
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.9.0'
+    }
+}
+
+apply plugin: 'android-library'
+
+android {
+    compileSdkVersion 9
+    buildToolsVersion '19.0.3'
+    
+    // NOTE: We are using the old folder structure to also support Eclipse
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            resources.srcDirs = ['src']
+            aidl.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            res.srcDirs = ['res']
+            assets.srcDirs = ['assets']
+        }
+    }
+    
+    // Do not abort build if lint finds errors
+    lintOptions {
+        abortOnError false
+    }
+}
diff --git a/build.xml b/build.xml
new file mode 100644
index 00000000..ed7657f2
--- /dev/null
+++ b/build.xml
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="keychain-api-library" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+It contains the path to the SDK. It should *NOT* be checked into
+Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+'android' tool to add properties to it.
+This is the place to change some Ant specific build properties.
+Here are some properties you may want to change/update:
+
+source.dir
+The name of the source directory. Default is 'src'.
+out.dir
+The name of the output directory. Default is 'bin'.
+
+For other overridable properties, look at the beginning of the rules
+files in the SDK, at tools/ant/build.xml
+
+Properties related to the SDK location or the project target should
+be updated using the 'android' tool with the 'update' action.
+
+This file is an integral part of the build system for your
+application and should be checked into Version Control Systems.
+
+-->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+get it from the ANDROID_HOME env var.
+This must be done before we load project.properties since
+the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_HOME}">
+        <isset property="env.ANDROID_HOME" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+tool, as well as ADT.
+
+This contains project specific properties such as project target, and library
+dependencies. Lower level build properties are stored in ant.properties
+(or in .classpath for Eclipse projects).
+
+This file is an integral part of the build system for your
+application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+Import per project custom build rules if present at the root of the project.
+This is the place to put custom intermediary targets such as:
+-pre-build
+-pre-compile
+-post-compile (This is typically used for code obfuscation.
+Compiled code location: ${out.classes.absolute.dir}
+If this is not done in place, override ${out.dex.input.absolute.dir})
+-post-package
+-post-build
+-pre-clean
+-->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+To customize existing targets, there are two options:
+- Customize only one target:
+- copy/paste the target into this file, *before* the
+<import> task.
+- customize it to your needs.
+- Customize the whole content of build.xml
+- copy/paste the content of the rules files (minus the top node)
+into this file, replacing the <import> task.
+- customize to your needs.
+
+***********************
+****** IMPORTANT ******
+***********************
+In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+in order to avoid having your file be overridden by tools such as "android update project"
+-->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>
diff --git a/proguard-project.txt b/proguard-project.txt
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/proguard-project.txt
diff --git a/project.properties b/project.properties
new file mode 100644
index 00000000..7096c5ce
--- /dev/null
+++ b/project.properties
@@ -0,0 +1,2 @@
+target=android-9
+android.library=true
diff --git a/src/de/measite/minidns/Client.java b/src/de/measite/minidns/Client.java
new file mode 100644
index 00000000..c32ec3a1
--- /dev/null
+++ b/src/de/measite/minidns/Client.java
@@ -0,0 +1,161 @@
+package de.measite.minidns;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.LineNumberReader;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.HashSet;
+import java.util.Random;
+
+import de.measite.minidns.Record.CLASS;
+import de.measite.minidns.Record.TYPE;
+
+/**
+ * A minimal DNS client for SRV/A/AAAA/NS and CNAME lookups, with IDN support.
+ * This circumvents the missing javax.naming package on android.
+ */
+public class Client {
+
+    /**
+     * The internal random class for sequence generation.
+     */
+    protected Random random;
+
+    /**
+     * Create a new DNS client.
+     */
+    public Client() {
+        try {
+            random = SecureRandom.getInstance("SHA1PRNG");
+        } catch (NoSuchAlgorithmException e1) {
+            random = new SecureRandom();
+        }
+    }
+
+    /**
+     * Query a nameserver for a single entry.
+     * @param name The DNS name to request.
+     * @param type The DNS type to request (SRV, A, AAAA, ...).
+     * @param clazz The class of the request (usually IN for Internet).
+     * @param host The DNS server host.
+     * @return 
+     * @throws IOException On IO Errors.
+     */
+    public DNSMessage query(String name, TYPE type, CLASS clazz, String host)
+        throws IOException
+    {
+        Question q = new Question();
+        q.setClazz(clazz);
+        q.setType(type);
+        q.setName(name);
+        return query(q, host);
+    }
+
+    /**
+     * Query the system nameserver for a single entry.
+     * @param name The DNS name to request.
+     * @param type The DNS type to request (SRV, A, AAAA, ...).
+     * @param clazz The class of the request (usually IN for Internet).
+     * @return The DNSMessage reply or null.
+     */
+    public DNSMessage query(String name, TYPE type, CLASS clazz)
+    {
+        Question q = new Question();
+        q.setClazz(clazz);
+        q.setType(type);
+        q.setName(name);
+        return query(q);
+    }
+
+    /**
+     * Query a specific server for one entry.
+     * @param q The question section of the DNS query.
+     * @param host The dns server host.
+     * @throws IOException On IOErrors.
+     */
+    public DNSMessage query(Question q, String host) throws IOException {
+        DNSMessage message = new DNSMessage();
+        message.setQuestions(new Question[]{q});
+        message.setRecursionDesired(true);
+        message.setId(random.nextInt());
+        byte[] buf = message.toArray();
+        DatagramSocket socket = new DatagramSocket();
+        DatagramPacket packet = new DatagramPacket(
+                buf, buf.length, InetAddress.getByName(host), 53);
+        socket.setSoTimeout(5000);
+        socket.send(packet);
+        packet = new DatagramPacket(new byte[513], 513);
+        socket.receive(packet);
+        DNSMessage dnsMessage = DNSMessage.parse(packet.getData());
+        if (dnsMessage.getId() != message.getId()) {
+            return null;
+        }
+        return dnsMessage;
+    }
+
+    /**
+     * Query the system DNS server for one entry.
+     * @param q The question section of the DNS query.
+     */
+    public DNSMessage query(Question q) {
+        String dnsServer[] = findDNS();
+        for (String dns : dnsServer) {
+            try {
+                DNSMessage message = query(q, dns);
+                if (message == null) {
+                    continue;
+                }
+                if (message.getResponseCode() !=
+                    DNSMessage.RESPONSE_CODE.NO_ERROR) {
+                    continue;
+                }
+                for (Record record: message.getAnswers()) {
+                    if (record.isAnswer(q)) {
+                        return message;
+                    }
+                }
+            } catch (IOException ioe) {
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Retrieve a list of currently configured DNS servers.
+     * @return The server array.
+     */
+    public String[] findDNS() {
+        try {
+            Process process = Runtime.getRuntime().exec("getprop");
+            InputStream inputStream = process.getInputStream();
+            LineNumberReader lnr = new LineNumberReader(
+                new InputStreamReader(inputStream));
+            String line = null;
+            HashSet<String> server = new HashSet<String>(6);
+            while ((line = lnr.readLine()) != null) {
+                int split = line.indexOf("]: [");
+                if (split == -1) {
+                    continue;
+                }
+                String property = line.substring(1, split);
+                String value = line.substring(split + 4, line.length() - 1);
+                if (property.endsWith(".dns") || property.endsWith(".dns1") ||
+                    property.endsWith(".dns2") || property.endsWith(".dns3") ||
+		    property.endsWith(".dns4")) {
+                    server.add(value);
+                }
+            }
+            if (server.size() > 0) {
+                return server.toArray(new String[server.size()]);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}
diff --git a/src/de/measite/minidns/DNSMessage.java b/src/de/measite/minidns/DNSMessage.java
new file mode 100644
index 00000000..14c8f04b
--- /dev/null
+++ b/src/de/measite/minidns/DNSMessage.java
@@ -0,0 +1,507 @@
+package de.measite.minidns;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * A DNS message as defined by rfc1035. The message consists of a header and
+ * 4 sections: question, answer, nameserver and addition resource record
+ * section.
+ * A message can either be parsed ({@see #parse(byte[])}) or serialized
+ * ({@see #toArray()}).
+ */
+public class DNSMessage {
+
+    /**
+     * Possible DNS reply codes.
+     */
+    public static enum RESPONSE_CODE {
+        NO_ERROR(0), FORMAT_ERR(1), SERVER_FAIL(2), NX_DOMAIN(3),
+        NO_IMP(4), REFUSED(5), YXDOMAIN(6), YXRRSET(7),
+        NXRRSET(8), NOT_AUTH(9),NOT_ZONE(10);
+
+        /**
+         * Reverse lookup table for response codes.
+         */
+        private final static RESPONSE_CODE INVERSE_LUT[] = new RESPONSE_CODE[]{
+            NO_ERROR, FORMAT_ERR, SERVER_FAIL, NX_DOMAIN, NO_IMP,
+            REFUSED, YXDOMAIN, YXRRSET, NXRRSET, NOT_AUTH, NOT_ZONE,
+            null, null, null, null, null
+        };
+
+        /**
+         * The response code value.
+         */
+        private final byte value;
+
+        /**
+         * Create a new response code.
+         * @param value The response code value.
+         */
+        private RESPONSE_CODE(int value) {
+            this.value = (byte)value;
+        }
+
+        /**
+         * Retrieve the byte value of the response code.
+         * @return
+         */
+        public byte getValue() {
+            return (byte) value;
+        }
+
+        /**
+         * Retrieve the response code for a byte value.
+         * @param value The byte value.
+         * @return The symbolic response code or null.
+         * @throws IllegalArgumentException if the value is not in the range of
+         *         0..15.
+         */
+        public static RESPONSE_CODE getResponseCode(int value) {
+            if (value < 0 || value > 15) {
+                throw new IllegalArgumentException();
+            }
+            return INVERSE_LUT[value];
+        }
+
+    };
+
+    /**
+     * Symbolic DNS Opcode values.
+     */
+    public static enum OPCODE {
+        QUERY(0),
+        INVERSE_QUERY(1),
+        STATUS(2),
+        NOTIFY(4),
+        UPDATE(5);
+
+        /**
+         * Lookup table for for obcode reolution.
+         */
+        private final static OPCODE INVERSE_LUT[] = new OPCODE[]{
+            QUERY, INVERSE_QUERY, STATUS, null, NOTIFY, UPDATE, null,
+            null, null, null, null, null, null, null, null
+        };
+
+        /**
+         * The value of this opcode.
+         */
+        private final byte value;
+
+        /**
+         * Create a new opcode for a given byte value.
+         * @param value The byte value of the opcode.
+         */
+        private OPCODE(int value) {
+            this.value = (byte)value;
+        }
+
+        /**
+         * Retrieve the byte value of this opcode.
+         * @return The byte value of this opcode.
+         */
+        public byte getValue() {
+            return value;
+        }
+
+        /**
+         * Retrieve the symbolic name of an opcode byte.
+         * @param value The byte value of the opcode.
+         * @return The symbolic opcode or null.
+         * @throws IllegalArgumentException If the byte value is not in the
+         *         range 0..15.
+         */
+        public static OPCODE getOpcode(int value) {
+            if (value < 0 || value > 15) {
+                throw new IllegalArgumentException();
+            }
+            return INVERSE_LUT[value];
+        }
+
+    };
+
+    /**
+     * The DNS message id.
+     */
+    protected int id;
+
+    /**
+     * The DNS message opcode.
+     */
+    protected OPCODE opcode;
+
+    /**
+     * The response code of this dns message.
+     */
+    protected RESPONSE_CODE responseCode;
+
+    /**
+     * True if this is a query.
+     */
+    protected boolean query;
+
+    /**
+     * True if this is a authorative response.
+     */
+    protected boolean authoritativeAnswer;
+
+    /**
+     * True on truncate, tcp should be used.
+     */
+    protected boolean truncated;
+
+    /**
+     * True if the server should recurse.
+     */
+    protected boolean recursionDesired;
+
+    /**
+     * True if recursion is possible.
+     */
+    protected boolean recursionAvailable;
+
+    /**
+     * True if the server regarded the response as authentic.
+     */
+    protected boolean authenticData;
+
+    /**
+     * True if the server should not check the replies.
+     */
+    protected boolean checkDisabled;
+
+    /**
+     * The question section content.
+     */
+    protected Question questions[];
+
+    /**
+     * The answers section content.
+     */
+    protected Record answers[];
+
+    /**
+     * The nameserver records.
+     */
+    protected Record nameserverRecords[];
+
+    /**
+     * Additional resousrce records.
+     */
+    protected Record additionalResourceRecords[];
+
+    /**
+     * Retrieve the current DNS message id.
+     * @return The current DNS message id.
+     */
+    public int getId() {
+        return id;
+    }
+
+    /**
+     * Set the current DNS message id.
+     * @param id The new DNS message id.
+     */
+    public void setId(int id) {
+        this.id = id & 0xffff;
+    }
+
+    /**
+     * Retrieve the query type (true or false;
+     * @return True if this DNS message is a query.
+     */
+    public boolean isQuery() {
+        return query;
+    }
+
+    /**
+     * Set the query status of this message.
+     * @param query The new query status.
+     */
+    public void setQuery(boolean query) {
+        this.query = query;
+    }
+
+    /**
+     * True if the DNS message is an authoritative answer.
+     * @return True if this an authoritative DNS message.
+     */
+    public boolean isAuthoritativeAnswer() {
+        return authoritativeAnswer;
+    }
+
+    /**
+     * Set the authoritative answer flag.
+     * @param authoritativeAnswer Tge new authoritative answer value.
+     */
+    public void setAuthoritativeAnswer(boolean authoritativeAnswer) {
+        this.authoritativeAnswer = authoritativeAnswer;
+    }
+
+    /**
+     * Retrieve the truncation status of this message. True means that the
+     * client should try a tcp lookup.
+     * @return True if this message was truncated.
+     */
+    public boolean isTruncated() {
+        return truncated;
+    }
+
+    /**
+     * Set the truncation bit on this DNS message.
+     * @param truncated The new truncated bit status.
+     */
+    public void setTruncated(boolean truncated) {
+        this.truncated = truncated;
+    }
+
+    /**
+     * Check if this message preferes recursion.
+     * @return True if recursion is desired.
+     */
+    public boolean isRecursionDesired() {
+        return recursionDesired;
+    }
+
+    /**
+     * Set the recursion desired flag on this message.
+     * @param recursionDesired The new recusrion setting.
+     */
+    public void setRecursionDesired(boolean recursionDesired) {
+        this.recursionDesired = recursionDesired;
+    }
+
+    /**
+     * Retrieve the recursion available flag of this DNS message.
+     * @return The recursion available flag of this message.
+     */
+    public boolean isRecursionAvailable() {
+        return recursionAvailable;
+    }
+
+    /**
+     * Set the recursion available flog from this DNS message.
+     * @param recursionAvailable The new recursion available status.
+     */
+    public void setRecursionAvailable(boolean recursionAvailable) {
+        this.recursionAvailable = recursionAvailable;
+    }
+
+    /**
+     * Retrieve the authentic data flag of this message.
+     * @return The authentic data flag.
+     */
+    public boolean isAuthenticData() {
+        return authenticData;
+    }
+
+    /**
+     * Set the authentic data flag on this DNS message.
+     * @param authenticData The new authentic data flag value.
+     */
+    public void setAuthenticData(boolean authenticData) {
+        this.authenticData = authenticData;
+    }
+
+    /**
+     * Check if checks are disabled.
+     * @return The status of the CheckDisabled flag.
+     */
+    public boolean isCheckDisabled() {
+        return checkDisabled;
+    }
+
+    /**
+     * Change the check status of this packet.
+     * @param checkDisabled
+     */
+    public void setCheckDisabled(boolean checkDisabled) {
+        this.checkDisabled = checkDisabled;
+    }
+
+    /**
+     * Generate a binary dns packet out of this message.
+     * @return byte[] the binary representation.
+     * @throws IOException Should never happen.
+     */
+    public byte[] toArray() throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
+        DataOutputStream dos = new DataOutputStream(baos);
+        int header = 0;
+        if (query) {
+            header += 1 << 15;
+        }
+        if (opcode != null) {
+            header += opcode.getValue() << 11;
+        }
+        if (authoritativeAnswer) {
+            header += 1 << 10;
+        }
+        if (truncated) {
+            header += 1 << 9;
+        }
+        if (recursionDesired) {
+            header += 1 << 8;
+        }
+        if (recursionAvailable) {
+            header += 1 << 7;
+        }
+        if (authenticData) {
+            header += 1 << 5;
+        }
+        if (checkDisabled) {
+            header += 1 << 4;
+        }
+        if (responseCode != null) {
+            header += responseCode.getValue();
+        }
+        dos.writeShort((short)id);
+        dos.writeShort((short)header);
+        if (questions == null) {
+            dos.writeShort(0);
+        } else {
+            dos.writeShort((short)questions.length);
+        }
+        if (answers == null) {
+            dos.writeShort(0);
+        } else {
+            dos.writeShort((short)answers.length);
+        }
+        if (nameserverRecords == null) {
+            dos.writeShort(0);
+        } else {
+            dos.writeShort((short)nameserverRecords.length);
+        }
+        if (additionalResourceRecords == null) {
+            dos.writeShort(0);
+        } else {
+            dos.writeShort((short)additionalResourceRecords.length);
+        }
+        for (Question question: questions) {
+            dos.write(question.toByteArray());
+        }
+        dos.flush();
+        return baos.toByteArray();
+    }
+
+    /**
+     * Build a DNS Message based on a binary DNS message.
+     * @param data The DNS message data.
+     * @return Parsed DNSMessage message.
+     * @throws IOException On read errors.
+     */
+    public static DNSMessage parse(byte data[]) throws IOException {
+        ByteArrayInputStream bis = new ByteArrayInputStream(data);
+        DataInputStream dis = new DataInputStream(bis);
+        DNSMessage message = new DNSMessage();
+        message.id = dis.readUnsignedShort();
+        int header = dis.readUnsignedShort();
+        message.query = ((header >> 15) & 1) == 0;
+        message.opcode = OPCODE.getOpcode((header >> 11) & 0xf);
+        message.authoritativeAnswer = ((header >> 10) & 1) == 1;
+        message.truncated = ((header >> 9) & 1) == 1;
+        message.recursionDesired = ((header >> 8) & 1) == 1;
+        message.recursionAvailable = ((header >> 7) & 1) == 1;
+        message.authenticData = ((header >> 5) & 1) == 1;
+        message.checkDisabled = ((header >> 4) & 1) == 1;
+        message.responseCode = RESPONSE_CODE.getResponseCode(header & 0xf);
+        int questionCount = dis.readUnsignedShort();
+        int answerCount = dis.readUnsignedShort();
+        int nameserverCount = dis.readUnsignedShort();
+        int additionalResourceRecordCount = dis.readUnsignedShort();
+        message.questions = new Question[questionCount];
+        while (questionCount-- > 0) {
+            Question q = new Question();
+            q.parse(dis, data);
+            message.questions[questionCount] = q;
+        }
+        message.answers = new Record[answerCount];
+        while (answerCount-- > 0) {
+            Record rr = new Record();
+            rr.parse(dis, data);
+            message.answers[answerCount] = rr;
+        }
+        message.nameserverRecords = new Record[nameserverCount];
+        while (nameserverCount-- > 0) {
+            Record rr = new Record();
+            rr.parse(dis, data);
+            message.nameserverRecords[nameserverCount] = rr;
+        }
+        message.additionalResourceRecords =
+                                    new Record[additionalResourceRecordCount];
+        while (additionalResourceRecordCount-- > 0) {
+            Record rr = new Record();
+            rr.parse(dis, data);
+            message.additionalResourceRecords[additionalResourceRecordCount] =
+                    rr;
+        }
+        return message;
+    }
+
+    /**
+     * Set the question part of this message.
+     * @param questions The questions.
+     */
+    public void setQuestions(Question ... questions) {
+        this.questions = questions;
+    }
+
+    /**
+     * Retrieve the opcode of this message.
+     * @return The opcode of this message.
+     */
+    public OPCODE getOpcode() {
+        return opcode;
+    }
+
+    /**
+     * Retrieve the response code of this message.
+     * @return The response code.
+     */
+    public RESPONSE_CODE getResponseCode() {
+        return responseCode;
+    }
+
+    /**
+     * Retrieve the question section of this message.
+     * @return The DNS question section.
+     */
+    public Question[] getQuestions() {
+        return questions;
+    }
+
+    /**
+     * Retrieve the answer records of this DNS message.
+     * @return The answer section of this DNS message.
+     */
+    public Record[] getAnswers() {
+        return answers;
+    }
+
+    /**
+     * Retrieve the nameserver records of this DNS message.
+     * @return The nameserver section of this DNS message.
+     */
+    public Record[] getNameserverRecords() {
+        return nameserverRecords;
+    }
+
+    /**
+     * Retrieve the additional resource records attached to this DNS message.
+     * @return The additional resource record section of this DNS message.
+     */
+    public Record[] getAdditionalResourceRecords() {
+        return additionalResourceRecords;
+    }
+
+    public String toString() {
+        return "-- DNSMessage " + id + " --\n" +
+               Arrays.toString(answers);
+    }
+
+}
diff --git a/src/de/measite/minidns/Question.java b/src/de/measite/minidns/Question.java
new file mode 100644
index 00000000..9d1e3f56
--- /dev/null
+++ b/src/de/measite/minidns/Question.java
@@ -0,0 +1,62 @@
+package de.measite.minidns;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.CLASS;
+import de.measite.minidns.Record.TYPE;
+import de.measite.minidns.util.NameUtil;
+
+public class Question {
+
+    private String name;
+
+    private TYPE type;
+
+    private CLASS clazz = CLASS.IN;
+
+    public TYPE getType() {
+        return type;
+    }
+
+    public void setType(TYPE type) {
+        this.type = type;
+    }
+
+    public CLASS getClazz() {
+        return clazz;
+    }
+
+    public void setClazz(CLASS clazz) {
+        this.clazz = clazz;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void parse(DataInputStream dis, byte[] data) throws IOException {
+        this.name = NameUtil.parse(dis, data);
+        this.type = TYPE.getType(dis.readUnsignedShort());
+        this.clazz = CLASS.getClass(dis.readUnsignedShort());
+    }
+
+    public byte[] toByteArray() throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
+        DataOutputStream dos = new DataOutputStream(baos);
+
+        dos.write(NameUtil.toByteArray(this.name));
+        dos.writeShort(type.getValue());
+        dos.writeShort(clazz.getValue());
+
+        dos.flush();
+        return baos.toByteArray();
+    }
+
+}
diff --git a/src/de/measite/minidns/Record.java b/src/de/measite/minidns/Record.java
new file mode 100644
index 00000000..adfa9713
--- /dev/null
+++ b/src/de/measite/minidns/Record.java
@@ -0,0 +1,293 @@
+package de.measite.minidns;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.HashMap;
+
+import de.measite.minidns.record.A;
+import de.measite.minidns.record.AAAA;
+import de.measite.minidns.record.CNAME;
+import de.measite.minidns.record.Data;
+import de.measite.minidns.record.NS;
+import de.measite.minidns.record.SRV;
+import de.measite.minidns.util.NameUtil;
+
+/**
+ * A generic DNS record.
+ */
+public class Record {
+
+    /**
+     * The record type.
+     * {@see http://www.iana.org/assignments/dns-parameters}
+     */
+    public static enum TYPE {
+        A(1),
+        NS(2),
+        MD(3),
+        MF(4),
+        CNAME(5),
+        SOA(6),
+        MB(7),
+        MG(8),
+        MR(9),
+        NULL(10),
+        WKS(11),
+        PTR(12),
+        HINFO(13),
+        MINFO(14),
+        MX(15),
+        TXT(16),
+        RP(17),
+        AFSDB(18),
+        X25(19),
+        ISDN(20),
+        RT(21),
+        NSAP(22),
+        NSAP_PTR(23),
+        SIG(24),
+        KEY(25),
+        PX(26),
+        GPOS(27),
+        AAAA(28),
+        LOC(29),
+        NXT(30),
+        EID(31),
+        NIMLOC(32),
+        SRV(33),
+        ATMA(34),
+        NAPTR(35),
+        KX(36),
+        CERT(37),
+        A6(38),
+        DNAME(39),
+        SINK(40),
+        OPT(41),
+        APL(42),
+        DS(43),
+        SSHFP(44),
+        IPSECKEY(45),
+        RRSIG(46),
+        NSEC(47),
+        DNSKEY(48),
+        DHCID(49),
+        NSEC3(50),
+        NSEC3PARAM(51),
+        HIP(55),
+        NINFO(56),
+        RKEY(57),
+        TALINK(58),
+        SPF(99),
+        UINFO(100),
+        UID(101),
+        GID(102),
+        TKEY(249),
+        TSIG(250),
+        IXFR(251),
+        AXFR(252),
+        MAILB(253),
+        MAILA(254),
+        ANY(255),
+        TA(32768),
+        DLV(32769);
+
+        /**
+         * The value of this DNS record type.
+         */
+        private final int value;
+
+        /**
+         * Internal lookup table to map values to types.
+         */
+        private final static HashMap<Integer, TYPE> INVERSE_LUT =
+                                        new HashMap<Integer, TYPE>();
+
+        /**
+         * Initialize the reverse lookup table.
+         */
+        static {
+            for(TYPE t: TYPE.values()) {
+                INVERSE_LUT.put(t.getValue(), t);
+            }
+        }
+
+        /**
+         * Create a new record type.
+         * @param value The binary value of this type.
+         */
+        private TYPE(int value) {
+            this.value = value;
+        }
+
+        /**
+         * Retrieve the binary value of this type.
+         * @return The binary value.
+         */
+        public int getValue() {
+            return value;
+        }
+
+        /**
+         * Retrieve the symbolic type of the binary value.
+         * @param value The binary type value.
+         * @return The symbolic tpye.
+         */
+        public static TYPE getType(int value) {
+            return INVERSE_LUT.get(value);
+        }
+    };
+
+    /**
+     * The symbolic class of a DNS record (usually IN for Internet).
+     */
+    public static enum CLASS {
+        IN(1),
+        CH(3),
+        HS(4),
+        NONE(254),
+        ANY(255);
+
+        /**
+         * Internal reverse lookup table to map binary class values to symbolic
+         * names.
+         */
+        private final static HashMap<Integer, CLASS> INVERSE_LUT =
+                                            new HashMap<Integer, CLASS>();
+
+        /**
+         * Initialize the interal reverse lookup table.
+         */
+        static {
+            for(CLASS c: CLASS.values()) {
+                INVERSE_LUT.put(c.getValue(), c);
+            }
+        }
+
+        /**
+         * The binary value of this dns class.
+         */
+        private final int value;
+
+        /**
+         * Create a new DNS class based on a binary value.
+         * @param value The binary value of this DNS class.
+         */
+        private CLASS(int value) {
+            this.value = value;
+        }
+
+        /**
+         * Retrieve the binary value of this DNS class.
+         * @return The binary value of this DNS class.
+         */
+        public int getValue() {
+            return value;
+        }
+
+        /**
+         * Retrieve the symbolic DNS class for a binary class value.
+         * @param value The binary DNS class value.
+         * @return The symbolic class instance.
+         */
+        public static CLASS getClass(int value) {
+            return INVERSE_LUT.get(value);
+        }
+
+    }
+
+    /**
+     * The generic name of this record.
+     */
+    protected String name;
+
+    /**
+     * The type (and payload type) of this record.
+     */
+    protected TYPE type;
+
+    /**
+     * The record class (usually CLASS.IN).
+     */
+    protected CLASS clazz;
+
+    /**
+     * The ttl of this record.
+     */
+    protected long ttl;
+
+    /**
+     * The payload object of this record.
+     */
+    protected Data payloadData;
+
+    /**
+     * Parse a given record based on the full message data and the current
+     * stream position.
+     * @param dis The DataInputStream positioned at the first record byte.
+     * @param data The full message data.
+     * @throws IOException In case of malformed replies.
+     */
+    public void parse(DataInputStream dis, byte[] data) throws IOException {
+        this.name = NameUtil.parse(dis, data);
+        this.type = TYPE.getType(dis.readUnsignedShort());
+        this.clazz = CLASS.getClass(dis.readUnsignedShort());
+        this.ttl = (((long)dis.readUnsignedShort()) << 32) +
+                   dis.readUnsignedShort();
+        int payloadLength = dis.readUnsignedShort();
+        switch (this.type) {
+        case SRV:
+            this.payloadData = new SRV();
+            break;
+        case AAAA:
+            this.payloadData = new AAAA();
+            break;
+        case A:
+            this.payloadData = new A();
+            break;
+        case NS:
+            this.payloadData = new NS();
+            break;
+        case CNAME:
+            this.payloadData = new CNAME();
+            break;
+        default:
+            System.out.println("Unparsed type " + type);
+            this.payloadData = null;
+            for (int i = 0; i < payloadLength; i++) {
+                dis.readByte();
+            }
+            break;
+        }
+        if (this.payloadData != null) {
+            this.payloadData.parse(dis, data, payloadLength);
+        }
+    }
+
+    /**
+     * Retrieve a textual representation of this resource record.
+     * @return String
+     */
+    @Override
+    public String toString() {
+        if (payloadData == null) {
+            return "RR " + type + "/" + clazz;
+        }
+        return "RR " + type + "/" + clazz + ": " + payloadData.toString();
+    };
+
+    /**
+     * Check if this record answers a given query.
+     * @param q The query.
+     * @return True if this record is a valid answer.
+     */
+    public boolean isAnswer(Question q) {
+        return ((q.getType() == type) || (q.getType() == TYPE.ANY)) &&
+               ((q.getClazz() == clazz) || (q.getClazz() == CLASS.ANY)) &&
+               (q.getName().equals(name));
+    }
+
+    public Data getPayload() {
+        return payloadData;
+    }
+
+}
diff --git a/src/de/measite/minidns/record/A.java b/src/de/measite/minidns/record/A.java
new file mode 100644
index 00000000..a85a7af0
--- /dev/null
+++ b/src/de/measite/minidns/record/A.java
@@ -0,0 +1,37 @@
+package de.measite.minidns.record;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.TYPE;
+
+public class A implements Data {
+
+    private byte[] ip;
+
+    @Override
+    public TYPE getType() {
+        return TYPE.A;
+    }
+
+    @Override
+    public byte[] toByteArray() {
+        return ip;
+    }
+
+    @Override
+    public void parse(DataInputStream dis, byte[] data, int length)
+            throws IOException {
+        ip = new byte[4];
+        dis.readFully(ip);
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(ip[0] & 0xff) + "." +
+               Integer.toString(ip[1] & 0xff) + "." +
+               Integer.toString(ip[2] & 0xff) + "." +
+               Integer.toString(ip[3] & 0xff);
+    }
+
+}
diff --git a/src/de/measite/minidns/record/AAAA.java b/src/de/measite/minidns/record/AAAA.java
new file mode 100644
index 00000000..d89147b2
--- /dev/null
+++ b/src/de/measite/minidns/record/AAAA.java
@@ -0,0 +1,43 @@
+package de.measite.minidns.record;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.TYPE;
+
+public class AAAA implements Data {
+
+    private byte[] ip;
+
+    @Override
+    public TYPE getType() {
+        return TYPE.AAAA;
+    }
+
+    @Override
+    public byte[] toByteArray() {
+        return ip;
+    }
+
+    @Override
+    public void parse(DataInputStream dis, byte[] data, int length)
+            throws IOException {
+        ip = new byte[16];
+        dis.readFully(ip);
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < ip.length; i += 2) {
+            if (i != 0) {
+                sb.append(':');
+            }
+            sb.append(Integer.toHexString(
+                ((ip[i] & 0xff) << 8) + (ip[i + 1] & 0xff)
+            ));
+        }
+        return sb.toString();
+    }
+
+}
diff --git a/src/de/measite/minidns/record/CNAME.java b/src/de/measite/minidns/record/CNAME.java
new file mode 100644
index 00000000..4657b4a5
--- /dev/null
+++ b/src/de/measite/minidns/record/CNAME.java
@@ -0,0 +1,44 @@
+package de.measite.minidns.record;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.TYPE;
+import de.measite.minidns.util.NameUtil;
+
+public class CNAME implements Data {
+
+    protected String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public byte[] toByteArray() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public void parse(DataInputStream dis, byte[] data, int length)
+        throws IOException
+    {
+        this.name = NameUtil.parse(dis, data);
+    }
+
+    @Override
+    public TYPE getType() {
+        return TYPE.CNAME;
+    }
+
+    @Override
+    public String toString() {
+        return "to \"" + name + "\"";
+    }
+
+}
diff --git a/src/de/measite/minidns/record/Data.java b/src/de/measite/minidns/record/Data.java
new file mode 100644
index 00000000..9cb80374
--- /dev/null
+++ b/src/de/measite/minidns/record/Data.java
@@ -0,0 +1,16 @@
+package de.measite.minidns.record;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.TYPE;
+
+public interface Data {
+
+    TYPE getType();
+
+    byte[] toByteArray();
+
+    void parse(DataInputStream dis, byte data[], int length) throws IOException;
+
+}
diff --git a/src/de/measite/minidns/record/NS.java b/src/de/measite/minidns/record/NS.java
new file mode 100644
index 00000000..bf07e8c4
--- /dev/null
+++ b/src/de/measite/minidns/record/NS.java
@@ -0,0 +1,12 @@
+package de.measite.minidns.record;
+
+import de.measite.minidns.Record.TYPE;
+
+public class NS extends CNAME {
+
+    @Override
+    public TYPE getType() {
+        return TYPE.NS;
+    }
+
+}
diff --git a/src/de/measite/minidns/record/SRV.java b/src/de/measite/minidns/record/SRV.java
new file mode 100644
index 00000000..32b70c4d
--- /dev/null
+++ b/src/de/measite/minidns/record/SRV.java
@@ -0,0 +1,74 @@
+package de.measite.minidns.record;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import de.measite.minidns.Record.TYPE;
+import de.measite.minidns.util.NameUtil;
+
+public class SRV implements Data {
+
+    protected int priority;
+    protected int weight;
+    protected int port;
+    protected String name;
+
+    public int getPriority() {
+        return priority;
+    }
+
+    public void setPriority(int priority) {
+        this.priority = priority;
+    }
+
+    public int getWeight() {
+        return weight;
+    }
+
+    public void setWeight(int weight) {
+        this.weight = weight;
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public void setPort(int port) {
+        this.port = port;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public byte[] toByteArray() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public void parse(DataInputStream dis, byte[] data, int length)
+        throws IOException
+    {
+        this.priority = dis.readUnsignedShort();
+        this.weight = dis.readUnsignedShort();
+        this.port = dis.readUnsignedShort();
+        this.name = NameUtil.parse(dis, data);
+    }
+
+    @Override
+    public String toString() {
+        return "SRV " + name + ":" + port + " p:" + priority + " w:" + weight;
+    }
+
+    @Override
+    public TYPE getType() {
+        return TYPE.SRV;
+    }
+
+}
diff --git a/src/de/measite/minidns/util/NameUtil.java b/src/de/measite/minidns/util/NameUtil.java
new file mode 100644
index 00000000..c42ac3eb
--- /dev/null
+++ b/src/de/measite/minidns/util/NameUtil.java
@@ -0,0 +1,77 @@
+package de.measite.minidns.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.IDN;
+import java.util.HashSet;
+
+public class NameUtil {
+
+    public static int size(String name) {
+        return name.length() + 2;
+    }
+
+    public static byte[] toByteArray(String name) throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream(64);
+        DataOutputStream dos = new DataOutputStream(baos);
+        for (String s: name.split("[.\u3002\uFF0E\uFF61]")) {
+            byte[] buffer = IDN.toASCII(s).getBytes();
+            dos.writeByte(buffer.length);
+            dos.write(buffer);
+        }
+        dos.writeByte(0);
+        dos.flush();
+        return baos.toByteArray();
+    }   
+
+    public static String parse(DataInputStream dis, byte data[]) 
+        throws IOException
+    {
+        int c = dis.readUnsignedByte();
+        if ((c & 0xc0) == 0xc0) {
+            c = ((c & 0x3f) << 8) + dis.readUnsignedByte();
+            HashSet<Integer> jumps = new HashSet<Integer>();
+            jumps.add(c);
+            return parse(data, c, jumps);
+        }
+        if (c == 0) {
+            return "";
+        }
+        byte b[] = new byte[c];
+        dis.readFully(b);
+        String s = IDN.toUnicode(new String(b));
+        String t = parse(dis, data);
+        if (t.length() > 0) {
+            s = s + "." + t;
+        }
+        return s;
+    }
+
+    public static String parse(
+        byte data[],
+        int offset,
+        HashSet<Integer> jumps
+    ) {
+        int c = data[offset] & 0xff;
+        if ((c & 0xc0) == 0xc0) {
+            c = ((c & 0x3f) << 8) + data[offset + 1];
+            if (jumps.contains(c)) {
+                throw new IllegalStateException("Cyclic offsets detected.");
+            }
+            jumps.add(c);
+            return parse(data, c, jumps);
+        }
+        if (c == 0) {
+            return "";
+        }
+        String s = new String(data,offset + 1, c);
+        String t = parse(data, offset + 1 + c, jumps);
+        if (t.length() > 0) {
+            s = s + "." + t;
+        }
+        return s;
+    }
+
+}