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package="de.measite.minidns"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="19" />
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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!

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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.

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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.

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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
}
}

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<?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>

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target=android-9
android.library=true

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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;
}
}

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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);
}
}

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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();
}
}

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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;
}
}

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src/de/measite/minidns/record/A.java Normal file
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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);
}
}

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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();
}
}

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src/de/measite/minidns/record/CNAME.java Normal file
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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 + "\"";
}
}

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src/de/measite/minidns/record/Data.java Normal file
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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;
}

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src/de/measite/minidns/record/NS.java Normal file
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package de.measite.minidns.record;
import de.measite.minidns.Record.TYPE;
public class NS extends CNAME {
@Override
public TYPE getType() {
return TYPE.NS;
}
}

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src/de/measite/minidns/record/SRV.java Normal file
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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;
}
}

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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;
}
}