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Travis Burtrum 2018-01-31 01:25:55 -05:00
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.idea/
*.iml
*/target/
target/

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# minTtl: rewrite TTLs lower than this to this value, default 600, 0 disables this feature
minTtl=600
# staleResponseTimeout: milliseconds to wait for response to query before serving a stale record if we have it, default 1000
staleResponseTimeout=1000
# staleResponseTtl: TTL to apply to stale record when above timeout is met and stale record is served, default 10
staleResponseTtl=10
# packetQueueLength: maximum requests queued waiting for responses from upstream, all resolvers specified process from this queue, cached responses don't enter this queue, default 100, 0 means unlimited
packetQueueLength=100
# listeners: list of listeners, currently supports tcp:// and udp:// with no options, default 'tcp://127.0.0.1:5353 udp://127.0.0.1:5353'
listeners=tcp://127.0.0.1:5353 udp://127.0.0.1:5353
# resolvers: list of resolvers with or without options, whitespace separated, options are in fragment separated by ;
# currently support tcp:// (regular DNS-over-TCP), tls:// (DNS-over-TLS), http:// https:// (DNS-over-HTTPS)
# both tls:// and https:// support option pubKeyPinsSha256 with a comma-separated list of base64 public key hashes like HPKP, not supplying this causes TLS connections to be unauthenticated (vulnerable to MITM)
# https:// also validates the hostname for now like a browser would
# default 'https://dns.google.com/experimental?ct#name=dns.google.com'
resolvers=\
tls://89.233.43.71#name=unicast.censurfridns.dk;pubKeyPinsSha256=wikE3jYAA6jQmXYTr/rbHeEPmC78dQwZbQp6WdrseEs= \
tls://145.100.185.15#name=dnsovertls.sinodun.com;pubKeyPinsSha256=62lKu9HsDVbyiPenApnc4sfmSYTHOVfFgL3pyB+cBL4= \
tls://145.100.185.16#name=dnsovertls1.sinodun.com;pubKeyPinsSha256=cE2ecALeE5B+urJhDrJlVFmf38cJLAvqekONvjvpqUA= \
tls://185.49.141.37#name=getdnsapi.net;pubKeyPinsSha256=foxZRnIh9gZpWnl+zEiKa0EJ2rdCGroMWm02gaxSc9Q= \
https://dns.google.com/experimental?ct#name=dns.google.com
#resolvers=https://dns.google.com/experimental?ct
#resolvers=tcp://8.8.4.4:53
#resolvers=tls://89.233.43.71:853#pubKeyPinsSha256=wikE3jYAA6jQmXYTr/rbHeEPmC78dQwZbQp6WdrseEs=
# below here are resolver options that may be defined here and/or at the resolver level, if both resolver level wins
# proxy: defines a proxy to use for all connections to this resolver, supports socks:// and http://, default none
#proxy=socks://127.0.0.1:9050
# pubKeyPinsSha256: should be on an individual resolver level, specify comma-seperated base64 public key hashes like HPKP, not supplying this causes TLS connections to be unauthenticated (vulnerable to MITM), default none
# https:// also validates the hostname for now like a browser would
#pubKeyPinsSha256=wikE3jYAA6jQmXYTr/rbHeEPmC78dQwZbQp6WdrseEs=
# maxRetries: maximum number of times a request is re-queued to be resolved upstream due to failure before giving up, this is maximum retries total, not per-resolver, default resolvers.length * 2
#maxRetries=5
# name: human-readable name of resolver, might end up in logs, default full resolver URI
#name=somename
# connectTimeout: TCP connection timeout in milliseconds to upstream resolver, default 500
connectTimeout=500

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### GNU GENERAL PUBLIC LICENSE
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Nothing in this License shall be construed as excluding or limiting
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#### 12. No Surrender of Others' Freedom.
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#### 13. Use with the GNU Affero General Public License.
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#### 14. Revised Versions of this License.
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statement of acceptance of a version permanently authorizes you to
choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
#### 15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "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 PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
#### 16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS THE PROGRAM 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 PROGRAM (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 PROGRAM
TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
#### 17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
### How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
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 program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands \`show w' and \`show c' should show the
appropriate parts of the General Public License. Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <https://www.gnu.org/licenses/why-not-lgpl.html>.

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<?xml version="1.0" encoding="UTF-8"?>
<!--
~ The contents of this file are subject to the Mozilla Public License Version 1.1
~ (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.mozilla.org/MPL/
~ Software distributed under the License is distributed on an "AS IS" basis,
~ WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
~ specific language governing rights and limitations under the License.
~
~ Copyright (c) 2018 Travis Burtrum.
~
~ Alternatively, the contents of this file may be used under the terms of the
~ GNU General Public License (the "GPL"), in which case the provisions of the GPL are
~ applicable instead of those above. If you wish to allow use of your version of this
~ file only under the terms of the GPL and not to allow others to use your version
~ of this file under the MPL, indicate your decision by deleting the provisions above
~ and replace them with the notice and other provisions required by the GPL License.
~ If you do not delete the provisions above, a recipient may use your version of
~ this file under either the MPL or the GPL.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<parent>
<groupId>org.sonatype.oss</groupId>
<artifactId>oss-parent</artifactId>
<version>9</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.moparisthebest.dns</groupId>
<artifactId>jDnsProxy</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>${project.artifactId}</name>
<description>
DNS Proxy.
</description>
<url>https://github.com/moparisthebest/jDnsProxy</url>
<organization>
<name>moparisthebest.com</name>
<url>https://www.moparisthebest.com</url>
</organization>
<developers>
<developer>
<id>moparisthebest</id>
<name>Travis Burtrum</name>
<email>admin@moparisthebest.com</email>
<url>https://www.moparisthebest.com/</url>
</developer>
</developers>
<scm>
<connection>scm:git:https://github.com/moparisthebest/jDnsProxy.git</connection>
<developerConnection>scm:git:https://github.com/moparisthebest/jDnsProxy.git</developerConnection>
<url>https://github.com/moparisthebest/jDnsProxy</url>
</scm>
<licenses>
<license>
<name>GNU General Public License, Version 3</name>
<url>https://www.gnu.org/licenses/gpl-3.0.html</url>
</license>
</licenses>
<properties>
<maven.test.skip>true</maven.test.skip>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<pushChanges>false</pushChanges>
<localCheckout>true</localCheckout>
</properties>
<dependencies>
<dependency>
<groupId>eu.geekplace.javapinning</groupId>
<artifactId>java-pinning-java7</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<debug>true</debug>
</configuration>
</plugin>
<plugin>
<groupId>org.sonatype.plugins</groupId>
<artifactId>nexus-staging-maven-plugin</artifactId>
<version>1.6.2</version>
<extensions>true</extensions>
<configuration>
<serverId>ossrh</serverId>
<nexusUrl>https://oss.sonatype.org/</nexusUrl>
<autoReleaseAfterClose>true</autoReleaseAfterClose>
</configuration>
</plugin>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<minimizeJar>false</minimizeJar>
<createDependencyReducedPom>false</createDependencyReducedPom>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.moparisthebest.dns.DnsProxy</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.7</version>
<configuration>
<additionalparam>-Xdoclint:none</additionalparam>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<profiles>
<profile>
<id>run-tests</id>
<activation>
<property>
<name>maven.test.skip</name>
<value>false</value>
</property>
</activation>
</profile>
</profiles>
</project>

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jDnsProxy
---------
Simple fast and lightweight DNS proxy and cache that listens on TCP or UDP ports and relays the request
to various upstream DNS-over-TCP, DNS-over-TLS, or DNS-over-HTTPS servers, optionally over http or socks
proxies (like tor), and optionally pinning public keys for complete TLS security. Implements a simple
response cache respecting TTLs but also implementing proper Serve-Stale functionality.
This should support any current and future DNS record generically, as well as providing full DNSSEC support if upstream
resolvers do.
Sample/default configuration is in jdnsproxy.properties and should be documented clearly there.
Build/run like so:
```
mvn clean package
java -jar target/jDnsProxy.jar ./jdnsproxy.properties
```
Implemented specs:
* [RFC-1035: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION](https://tools.ietf.org/html/rfc1035)
* [Draft: Serving Stale Data to Improve DNS Resiliency](https://tools.ietf.org/html/draft-ietf-dnsop-serve-stale)
* [Draft: DNS Queries over HTTPS](https://tools.ietf.org/html/draft-hoffman-dns-over-https)
* [RFC-6891: Extension Mechanisms for DNS (EDNS(0))](https://tools.ietf.org/html/rfc6891)
* [DNS EDNS0 Option Codes (OPT)](https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-11)
* [RFC-3225: Indicating Resolver Support of DNSSEC](https://tools.ietf.org/html/rfc3225)
Use these for quick testing:
```
dig -p5353 @127.0.0.1 debian.org +tries=1 +retry=0 +tcp
dig -p5353 @127.0.0.1 debian.org +tries=1 +retry=0 +tcp +dnssec
dig -p5353 @127.0.0.1 debian.org +tries=1 +retry=0
dig -p5353 @127.0.0.1 debian.org +tries=1 +retry=0 +dnssec
```
And use this to extract TLS public keys in pinning format:
```
openssl s_client -connect 'dns.google.com:443' 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p' | openssl x509 -noout -pubkey | openssl asn1parse -noout -inform pem -out /dev/stdout | openssl dgst -sha256 -binary | openssl base64
```
License
-------
GNU/GPLv3 for now, ping me if you think it should be something else, I don't care much.

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src/main/java/com/moparisthebest/dns/DnsProxy.java Normal file
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package com.moparisthebest.dns;
import com.moparisthebest.dns.listen.Listener;
import com.moparisthebest.dns.net.ParsedUrl;
import com.moparisthebest.dns.resolve.CacheResolver;
import com.moparisthebest.dns.resolve.QueueProcessingResolver;
import java.io.FileInputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.*;
import java.util.stream.Collectors;
import static com.moparisthebest.dns.Util.tryClose;
public class DnsProxy {
public static void main(String[] args) throws Throwable {
final Map<String, String> config;
try (FileInputStream fis = new FileInputStream(args.length > 0 ? args[0] : "jdnsproxy.properties")) {
final Properties props = new Properties();
props.load(fis);
@SuppressWarnings("unchecked") final Map<String, String> configUnchecked = (Map<String, String>) (Object) props;
config = configUnchecked;
}
System.out.println("config:" + config);
final int minTtl = Integer.parseInt(config.getOrDefault("minTtl", "600"));
final int staleResponseTtl = Integer.parseInt(config.getOrDefault("staleResponseTtl", "10"));
final long staleResponseTimeout = Long.parseLong(config.getOrDefault("staleResponseTimeout", "1000"));
final int packetQueueLength = Integer.parseInt(config.getOrDefault("packetQueueLength", "100"));
final String[] resolvers = config.getOrDefault("resolvers", "https://dns.google.com/experimental?ct#name=dns.google.com").split("\\s+");
if (!config.containsKey("maxRetries"))
config.put("maxRetries", String.valueOf(resolvers.length * 2));
//System.out.println("resolvers: " + Arrays.toString(resolvers));
final List<QueueProcessingResolver> queueProcessingResolvers = Arrays.stream(resolvers).map(s -> ParsedUrl.of(s, config)).map(QueueProcessingResolver::of).collect(Collectors.toList());
//final List<QueueProcessingResolver> queueProcessingResolvers = new ArrayList<>();
//queueProcessingResolvers.add(new SocketResolver(5, "socket1", SocketFactory.getDefault(), new InetSocketAddress("8.8.4.4", 53)));
//queueProcessingResolvers.add(new HttpResolver(5, "http1", "https://dns.google.com/experimental?ct"));
final ExecutorService executor = ForkJoinPool.commonPool();
final ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(8);
final CacheResolver resolver = new CacheResolver(minTtl, staleResponseTtl, staleResponseTimeout, packetQueueLength, executor, scheduledExecutorService)
.startQueueProcessingResolvers(queueProcessingResolvers);
final List<Listener> listeners = Arrays.stream(config.getOrDefault("listeners", "tcp://127.0.0.1:5353 udp://127.0.0.1:5353").split("\\s+"))
.map(url -> Listener.ofAndStart(url, resolver, executor)).collect(Collectors.toList());
//final List<Listener> listeners = new ArrayList<>();
//listeners.add(Listener.ofAndStart("tcp://127.0.0.1:5556", resolver, executor));
//listeners.add(Listener.ofAndStart("udp://127.0.0.1:5556", resolver, executor));
System.out.println("startup complete");
final Thread cleanKill = new Thread(() -> {
System.out.println("shutdown requested");
//if(true) return;
executor.shutdown();
scheduledExecutorService.shutdown();
queueProcessingResolvers.forEach(Util::tryClose);
listeners.forEach(Util::tryClose);
tryClose(resolver);
System.out.println("shutdown complete");
});
Runtime.getRuntime().addShutdownHook(cleanKill);
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
}
}

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package com.moparisthebest.dns;
import com.moparisthebest.dns.dto.Packet;
import java.io.*;
import java.nio.ByteBuffer;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
public class Util {
private Util() throws Exception {
throw new Exception("no instance for you");
}
public static Packet readTcpPacket(final DataInputStream dis) throws IOException {
final int length = dis.readUnsignedShort();
return readPacket(length, dis);
}
public static Packet readPacket(final int length, final DataInputStream dis) throws IOException {
//System.out.println("length: " + length);
final ByteBuffer bb = ByteBuffer.allocate(length);
final byte[] request = bb.array();
dis.readFully(request);
//System.out.println("request:");
//debugPacket(request);
return new Packet(bb);
}
public static void writeTcpPacket(final Packet p, final DataOutputStream dos) throws IOException {
dos.writeShort(p.getBuf().capacity());
dos.write(p.getBuf().array());
}
public static void tryClose(final AutoCloseable closeable) {
try {
closeable.close();
} catch (Throwable e) {
// ignore
}
}
public static <U> CompletableFuture<U> supplyAsyncOnTimeOut(final ScheduledExecutorService e, final long timeout, final TimeUnit unit, final Supplier<U> f) {
if (e == null || f == null) throw new NullPointerException();
final CompletableFuture<U> d = new CompletableFuture<>();
e.schedule(() -> {
if (!d.isDone()) {
try {
d.complete(f.get());
} catch (Throwable ex) {
d.completeExceptionally(ex);
}
}
}, timeout, unit);
return d;
}
/*
// temp debug code
public static void debugPacket(final byte[] packet) {
System.out.println(Base64.getUrlEncoder().encodeToString(packet));
//System.out.println(new Packet(ByteBuffer.wrap(packet, 2, packet.length - 2).slice()));
System.out.println(new Packet(ByteBuffer.wrap(packet).slice()));
printPrettyHexBytes(ByteBuffer.wrap(packet));
printPrettyChars(packet);
printPrettyDecimalUnsignedBytes(ByteBuffer.wrap(packet));
}
public static void printPrettyHexBytes(ByteBuffer bytes) {
bytes = bytes.slice();
System.out.println("-----------------------------");
int count = 0;
for (int x = 0; x < bytes.limit(); ++x) {
System.out.printf("%02X ", bytes.get(x));
if (++count == 8) {
System.out.println();
count = 0;
} else if (count % 2 == 0) {
System.out.print("| ");
}
}
System.out.println();
System.out.println("+++++++++++++++++++++++++++++");
}
public static void printPrettyChars(final byte[] bytes) {
System.out.println("-----------------------------");
int count = 0;
for (final byte b : bytes) {
System.out.printf("%02X(%c) ", b, (char) b);
if (++count == 8) {
System.out.println();
count = 0;
} else if (count % 2 == 0) {
System.out.print("| ");
}
}
System.out.println();
System.out.println("+++++++++++++++++++++++++++++");
}
public static void printPrettyDecimalUnsignedBytes(ByteBuffer bytes) {
bytes = bytes.slice();
System.out.println("-----------------------------");
int count = 0;
for (int x = 0; x < bytes.limit(); ++x) {
System.out.printf("%02X(%d) ", bytes.get(x), Byte.toUnsignedInt(bytes.get(x)));
if (++count == 8) {
System.out.println();
count = 0;
} else if (count % 2 == 0) {
System.out.print("| ");
}
}
System.out.println();
System.out.println("+++++++++++++++++++++++++++++");
}
public static Packet getResponse(final Packet request) throws Exception {
final SocketFactory socketFactory = SocketFactory.getDefault();
final Socket upstream = socketFactory.createSocket("8.8.4.4", 53);
//final SSLContext sslContext = Java7Pinning.forPin("SHA256:c22904de360003a8d0997613affadb1de10f982efc750c196d0a7a59daec784b");
//final SocketFactory socketFactory = sslContext.getSocketFactory();
//final Socket upstream = socketFactory.createSocket("89.233.43.71", 853);
//final Socket ssl = new SSL("8.8.4.4", 53);
final Packet response;
try (InputStream upIs = upstream.getInputStream();
DataInputStream upDis = new DataInputStream(upIs);
OutputStream upOs = upstream.getOutputStream();
DataOutputStream upDos = new DataOutputStream(upOs)) {
writeTcpPacket(request, upDos);
upDos.flush();
response = readTcpPacket(upDis);
}
return response;
}
public static Packet getHttpResponse(final Packet request) throws Exception {
final URL url = new URL("https://dns.google.com/experimental?ct");
final HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
//final SSLContext sslContext = Java7Pinning.forPin("SHA256:c96d45b587a9230a50185ddd25ff36fd23bee886c91a5133d8bd82d9c4f0b676");
//final SSLSocketFactory socketFactory = sslContext.getSocketFactory();
//conn.setSSLSocketFactory(socketFactory);
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/dns-udpwireformat");
conn.setRequestProperty("Accept", "application/dns-udpwireformat");
try (OutputStream os = conn.getOutputStream()) {
os.write(request.getBuf().array());
os.flush();
try (InputStream is = conn.getInputStream();
DataInputStream dis = new DataInputStream(is);) {
final int responseCode = conn.getResponseCode();
System.out.println("responseCode: " + responseCode);
final int contentLength = conn.getContentLength();
System.out.println("contentLength: " + contentLength);
return readPacket(contentLength, dis);
}
}
}
public static byte[] getBytesFromInputStream(InputStream is) throws IOException {
try (ByteArrayOutputStream os = new ByteArrayOutputStream();) {
final byte[] buffer = new byte[2048];
for (int len; (len = is.read(buffer)) != -1; )
os.write(buffer, 0, len);
os.flush();
return os.toByteArray();
}
}
public static void maine(String[] args) throws Throwable {
// sync udp
final DatagramSocket ss = new DatagramSocket(5555);
final DatagramPacket request = new DatagramPacket(new byte[512], 512);
final InetAddress upSrv = InetAddress.getByName("8.8.4.4");
final DatagramSocket upstream = ss;//new DatagramSocket();
//upstream.connect(upSrv, 53);
while (!ss.isClosed()) {
ss.receive(request);
System.out.println("got packet");
System.out.println(new Packet(ByteBuffer.wrap(request.getData(), request.getOffset(), request.getLength()).slice()));
debugPacket(request.getData());
final InetAddress old = request.getAddress();
final int oldPort = request.getPort();
request.setAddress(upSrv);
request.setPort(53);
upstream.send(request);
System.out.println("sent packet");
upstream.receive(request);
System.out.println("got packet 2");
request.setAddress(old);
request.setPort(oldPort);
ss.send(request);
System.out.println("sent packet");
}
// sync tcp with debug
if (false)
try (FileInputStream request = new FileInputStream("test.request");
FileInputStream response = new FileInputStream("test.resolve");
) {
System.out.println("request: ");
debugPacket(getBytesFromInputStream(request));
System.out.println("resolve: ");
debugPacket(getBytesFromInputStream(response));
// just testing
return;
} catch (FileNotFoundException e) {
// ignore, start normal
}
//if(true) return;
final ServerSocket ss = new ServerSocket(5555);
while (!ss.isClosed()) {
final Socket s = ss.accept();
System.out.println("got socket");
try (InputStream is = s.getInputStream();
DataInputStream dis = new DataInputStream(is);
OutputStream os = s.getOutputStream();
DataOutputStream dos = new DataOutputStream(os)) {
final Packet request = readTcpPacket(dis);
final int requestId = request.getId();
request.setId(0);
try (FileOutputStream fos = new FileOutputStream("test.request")) {
fos.write(request.getBuf().array());
}
System.out.println("request: " + request);
//final Packet resolve = getResponse(request);
final Packet response = getHttpResponse(request);
try (FileOutputStream fos = new FileOutputStream("test.resolve")) {
fos.write(response.getBuf().array());
}
System.out.println("resolve: " + response);
//debugPacket(resolve);
response.setId(requestId);
writeTcpPacket(response, dos);
dos.flush();
}
}
}
*/
}

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src/main/java/com/moparisthebest/dns/dto/AbstractBufferWindow.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
public abstract class AbstractBufferWindow implements BufferWindow {
protected final ByteBuffer buf;
protected int start, end;
public AbstractBufferWindow(final ByteBuffer buf, final int start) {
this.buf = buf;
this.start = start;
}
public AbstractBufferWindow(final ByteBuffer buf) {
this(buf, buf.position());
}
@Override
public ByteBuffer getBuf() {
return buf;
}
@Override
public int getStart() {
return start;
}
@Override
public int getEnd() {
return end;
}
}

45
src/main/java/com/moparisthebest/dns/dto/BufferWindow.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
public interface BufferWindow {
ByteBuffer getBuf();
int getStart();
int getEnd();
default byte readI8(final int offset) {
return getBuf().get(getStart() + offset);
}
default int readU8(final int offset) {
return Byte.toUnsignedInt(getBuf().get(getStart() + offset));
}
default short readI16(final int offset) {
return getBuf().getShort(getStart() + offset);
}
default int readU16(final int offset) {
return Short.toUnsignedInt(getBuf().getShort(getStart() + offset));
}
default void writeU16(final int offset, final int u16) {
getBuf().putShort(getStart() + offset, (short)u16);
}
default int readI32(final int offset) {
return getBuf().getInt(getStart() + offset);
}
default void writeI32(final int offset, final int i32) {
getBuf().putInt(getStart() + offset, i32);
}
default long readU32(final int offset) {
return Integer.toUnsignedLong(getBuf().getInt(getStart() + offset));
}
default byte readBit(final int offset, final int bit) {
return (getBuf().get(getStart() + offset) & (1 << bit)) != 0 ? (byte)0 : 1;
}
}

98
src/main/java/com/moparisthebest/dns/dto/Name.java Normal file
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package com.moparisthebest.dns.dto;
import com.moparisthebest.dns.DnsProxy;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Name extends AbstractBufferWindow {
private static final int POINTER_MASK = 0b1100_0000;
private static final int POINTER_UNMASK = 0b0011_1111_1111_1111;
private final int[] partIndices;
private final int domainLength;
public Name(final ByteBuffer buf) {
super(buf);
/*
System.out.println("before name");
System.out.println("index: " + buf.position());
System.out.println("start: " + start);
DnsProxy.printPrettyHexBytes(buf);
new Exception().printStackTrace(System.out);
*/
final List<Integer> partIndices = new ArrayList<>();
int domainLength = -1, i = start;
do {
final int b = Byte.toUnsignedInt(getBuf().get(i));
/*
System.out.printf("i: %d, b: %d\n", i, b);
System.out.println("binaryString: " + Integer.toBinaryString(b));
*/
if (b == 0) {
// if end was not set by pointer below, set it now
if (this.end == 0)
this.end = i + 1;
break;
} else if ((b & POINTER_MASK) == POINTER_MASK) {
// if end was not set by previous, set it now
if (this.end == 0)
this.end = i + 2;
i = Short.toUnsignedInt(getBuf().getShort(i)) & POINTER_UNMASK;
//System.out.println("found pointer, new index: " + i);
// if we have already recursed to this index, some naughty DNS packet is trying to get us stuck in an infinite loop, we'll show them
if(partIndices.contains(i))
throw new RuntimeException("NAME pointer would cause infinite recursion");
} else if ((b & POINTER_MASK) == 0) {
//System.out.printf("i: %d, partLength: %d\n", i, b);
partIndices.add(i);
domainLength += b + 1;
i += b + 1;
} else {
throw new RuntimeException("10 and 01 combinations are reserved for future use (invalid NAME)");
}
}while(true);
this.partIndices = new int[partIndices.size()];
for(int x = 0; x < this.partIndices.length; ++x)
this.partIndices[x] = partIndices.get(x);
this.domainLength = domainLength == -1 ? 0 : domainLength;
/*
System.out.println("partIndices: "+partIndices);
System.out.println("partIndices: "+ Arrays.toString(this.partIndices));
System.out.println("this.domainLength: "+this.domainLength);
*/
}
public int getDomainLength() {
return domainLength;
}
public String getDomain() {
if(domainLength == 0)
return "";
final char[] ret = new char[domainLength];
int y = -1;
for (final int i : partIndices) {
final int partLength = Byte.toUnsignedInt(buf.get(i));
//System.out.printf("i: %d, partLength: %d\n", i, partLength);
if (i != partIndices[0])
ret[++y] = '.';
for (int x = 1; x <= partLength; ++x)
ret[++y] = (char) buf.get(i + x);
}
return new String(ret);
}
@Override
public String toString() {
return "Domain{" +
"domainLength=" + getDomainLength() +
", domain=" + getDomain() +
'}';
}
}

90
src/main/java/com/moparisthebest/dns/dto/Opt.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class Opt extends AbstractBufferWindow {
public static final int OPT_TYPE_CODE = 41;
private static final byte[] OPT_HEADER = new byte[]{0, 0, 41};
private static final int FLAG_DNSSEC_OK = 0b1000_0000_0000_0000;
public static Opt tryOpt(final ByteBuffer buf) {
int start = buf.position();
for(final byte oh : OPT_HEADER)
if(buf.get(start++) != oh)
return null;
return new Opt(buf);
}
private Opt(final ByteBuffer buf) {
super(buf);
++this.start; // just one after position
this.end = this.start + 10 + getRDataLen();
}
public int getType() {
return readU16(0);
}
public int getUdpPayloadSize() {
return readU16(2);
}
public byte getExtendedRcode() {
return readI8(4);
}
public int getVersion() {
return readU8(5);
}
public int getFlags() {
return readU16(6);
}
public boolean isDnssecOk() {
return (getFlags() & FLAG_DNSSEC_OK) != 0;
}
public int getRDataLen() {
return readU16(8);
}
public List<OptData> getOptData() {
final int rDataLen = getRDataLen();
if (rDataLen == 0)
return Collections.emptyList();
buf.position(getStart() + 10);
final List<OptData> ret = new ArrayList<>();
//System.out.println("all questions buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
while(buf.position() < (getStart() + rDataLen)) {
final OptData o = new OptData(buf);
ret.add(o);
buf.position(o.getEnd());
}
//System.out.println("after questions buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
return ret;
}
@Override
public String toString() {
return "Opt{" +
"type=" + getType() +
", udpPayloadSize=" + getUdpPayloadSize() +
", extendedRcode=" + getExtendedRcode() +
", version=" + getVersion() +
", flags=" + getFlags() +
", dnssecOk=" + isDnssecOk() +
", rDataLen=" + getRDataLen() +
", optData=" + getOptData() +
'}';
}
}

27
src/main/java/com/moparisthebest/dns/dto/OptData.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
public class OptData extends AbstractBufferWindow {
public OptData(final ByteBuffer buf) {
super(buf);
this.end = this.start + 4 + getDataLen();
}
public int getCode() {
return readU16(0);
}
public int getDataLen() {
return readU16(2);
}
@Override
public String toString() {
return "Opt{" +
"code=" + getCode() +
", dataLen=" + getDataLen() +
'}';
}
}

275
src/main/java/com/moparisthebest/dns/dto/Packet.java Normal file
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package com.moparisthebest.dns.dto;
import com.moparisthebest.dns.DnsProxy;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
public class Packet extends AbstractBufferWindow {
private static final int FLAG_QUERY = 0b1000_0000_0000_0000;
private static final int FLAG_OPCODE_MASK = 0b0111_1000_0000_0000;
private static final int FLAG_AUTHORITATIVE = 0b0000_0100_0000_0000;
private static final int FLAG_TRUNCATED = 0b0000_0010_0000_0000;
private static final int FLAG_RECURSION_DESIRED = 0b0000_0001_0000_0000;
private static final int FLAG_RECURSION_AVAILABLE = 0b0000_0000_1000_0000;
private static final int FLAG_AUTHENTICATED_DATA = 0b0000_0000_0010_0000;
private static final int FLAG_CHECKING_DISABLED = 0b0000_0000_0001_0000;
private static final int FLAG_RESERVED_MASK = 0b0000_0000_0100_0000;
private static final int FLAG_RESPONSE_CODE_MASK = 0b0000_0000_0000_1111;
public Packet(final ByteBuffer buf) {
super(buf);
if (this.buf.limit() < 12)
throw new RuntimeException("header too short");
}
private Packet(final ByteBuffer buf, final int start, final int end) {
super(buf, start);
this.end = end;
}
public Packet(final byte[] buf) {
this(ByteBuffer.wrap(buf));
}
public int getId() {
return readU16(0);
}
public Packet setId(final int id) {
writeU16(0, id);
return this;
}
public int getFlags() {
return readU16(2);
//return readI16(2);
}
public boolean getQuery() {
return (getFlags() & FLAG_QUERY) == 0;
}
public boolean getOpcode() {
// todo: implement opcode: ((flags & flag::OPCODE_MASK) >> flag::OPCODE_MASK.trailing_zeros()).into(),
return (getFlags() & FLAG_OPCODE_MASK) == 0;
}
public boolean getAuthoritative() {
return (getFlags() & FLAG_AUTHORITATIVE) == 0;
}
public boolean getTruncated() {
return (getFlags() & FLAG_TRUNCATED) == 0;
}
public boolean getRecursionDesired() {
return (getFlags() & FLAG_RECURSION_DESIRED) == 0;
}
public boolean getRecursionAvailable() {
return (getFlags() & FLAG_RECURSION_AVAILABLE) == 0;
}
public boolean getAuthenticatedData() {
return (getFlags() & FLAG_AUTHENTICATED_DATA) == 0;
}
public boolean getCheckingDisabled() {
return (getFlags() & FLAG_CHECKING_DISABLED) == 0;
}
public byte getResponseCode() {
return (byte) (getFlags() & FLAG_RESPONSE_CODE_MASK);
}
public int getNumQuestions() {
return readU16(4);
}
public int getNumAnswers() {
return readU16(6);
}
public int getNumNameservers() {
return readU16(8);
}
public int getNumAdditional() {
return readU16(10);
}
public List<Question> getQuestions() {
buf.position(12);
final int questions = getNumQuestions();
if (questions == 0)
return Collections.emptyList();
final Question[] ret = new Question[questions];
//System.out.println("all questions buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
for (int x = 0; x < ret.length; ++x) {
final Question q = new Question(buf);
ret[x] = q;
buf.position(q.getEnd());
}
//System.out.println("after questions buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
return Arrays.asList(ret);
}
private List<ResourceRecord> getResourceRecords(final int num) {
if (num == 0)
return Collections.emptyList();
final ResourceRecord[] ret = new ResourceRecord[num];
//System.out.println("all answers buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
for (int x = 0; x < ret.length; ++x) {
final ResourceRecord q = new ResourceRecord(buf);
ret[x] = q;
//System.out.println("rr.getEnd()" + q.getEnd());
buf.position(q.getEnd());
}
//System.out.println("after answers buf.position(): " + buf.position());
//DnsProxy.printPrettyHexBytes(buf);
return Arrays.asList(ret);
}
public List<ResourceRecord> getAnswers() {
getQuestions(); // move position to correct place
return getResourceRecords(getNumAnswers());
}
public List<ResourceRecord> getNameservers() {
getAnswers(); // move position to correct place
return getResourceRecords(getNumNameservers());
}
public List<ResourceRecord> getAdditional() {
getNameservers(); // move position to correct place
return getResourceRecords(getNumAdditional());
}
public Opt getOpt() {
getNameservers(); // move position to correct place
//System.out.println("before getOpt buf.position(): " + buf.position());
final int num = getNumAdditional();
if (num == 0)
return null;
for (int x = 0; x < num; ++x) {
final Opt opt = Opt.tryOpt(buf);
if(opt != null)
return opt;
//System.out.println("rr.getEnd()" + q.getEnd());
buf.position(new ResourceRecord(buf).getEnd());
}
return null;
}
public boolean isDnssecOk() {
if(getNumAdditional() < 1)
return false;
final Opt opt = getOpt();
return opt != null && opt.isDnssecOk();
}
@Override
public int getEnd() {
if(end == 0) {
// not cached yet
getAdditional(); //moves pointer to end
end = buf.position();
buf.limit(end);
}
return end;
}
public int getLength() {
return getEnd() - start;
}
public int getLowestTtl() {
// todo: can make this a bit quicker since we know what positions we are in
int lowestTtl = Integer.MAX_VALUE;
for (final ResourceRecord rr : this.getAnswers()) {
final int rrTtl = rr.getTtl();
if (rrTtl < lowestTtl)
lowestTtl = rrTtl;
}
for (final ResourceRecord rr : this.getNameservers()) {
final int rrTtl = rr.getTtl();
if (rrTtl < lowestTtl)
lowestTtl = rrTtl;
}
for (final ResourceRecord rr : this.getAdditional()) {
if (rr.getType() != Opt.OPT_TYPE_CODE) {
final int rrTtl = rr.getTtl();
if (rrTtl < lowestTtl)
lowestTtl = rrTtl;
}
}
return lowestTtl;
}
public Packet modTtls(final Function<Integer, Integer> mod) {
for (final ResourceRecord rr : this.getAnswers()) {
rr.setTtl(mod.apply(rr.getTtl()));
}
for (final ResourceRecord rr : this.getNameservers()) {
rr.setTtl(mod.apply(rr.getTtl()));
}
for (final ResourceRecord rr : this.getAdditional()) {
if (rr.getType() != Opt.OPT_TYPE_CODE) {
rr.setTtl(mod.apply(rr.getTtl()));
}
}
return this;
}
public Packet copy() {
final ByteBuffer copy = ByteBuffer.allocate(getEnd() - start);
buf.position(start);
copy.put(buf);
return new Packet(copy, start, end);
}
public String getDohBase64() {
// todo: remove trailing equals
return Base64.getUrlEncoder().encodeToString(getBuf().array());
}
@Override
public String toString() {
return "Packet{" +
"id=" + getId() +
", flags=" + getFlags() +
", query=" + getQuery() +
", opcode=" + getOpcode() +
", authoritative=" + getAuthoritative() +
", truncated=" + getTruncated() +
", recursionDesired=" + getRecursionDesired() +
", recursionAvailable=" + getRecursionAvailable() +
", authenticatedData=" + getAuthenticatedData() +
", checkingDisabled=" + getCheckingDisabled() +
", responseCode=" + getResponseCode() +
", numQuestions=" + getNumQuestions() +
", numAnswers=" + getNumAnswers() +
", numNameservers=" + getNumNameservers() +
", numAdditional=" + getNumAdditional() +
", questions=" + getQuestions() +
", answers=" + getAnswers() +
", nameservers=" + getNameservers() +
", additional=" + getAdditional() +
", opt=" + getOpt() +
", lowestTtl=" + getLowestTtl() +
", start=" + getStart() +
", end=" + getEnd() +
", length=" + getLength() +
", dohBase64=" + getDohBase64() +
'}';
}
}

36
src/main/java/com/moparisthebest/dns/dto/Question.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
public class Question extends AbstractBufferWindow {
private final Name name;
public Question(final ByteBuffer buf) {
super(buf);
this.name = new Name(buf);
this.start = this.name.end;
this.end = this.start + 4;
}
public Name getName() {
return name;
}
public int getQType() {
return readU16(0);
}
public int getQClass() {
return readU16(2);
}
@Override
public String toString() {
return "Question{" +
"name=" + getName() +
", qType=" + getQType() +
", qClass=" + getQClass() +
'}';
}
}

51
src/main/java/com/moparisthebest/dns/dto/ResourceRecord.java Normal file
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package com.moparisthebest.dns.dto;
import java.nio.ByteBuffer;
public class ResourceRecord extends AbstractBufferWindow {
private final Name name;
public ResourceRecord(final ByteBuffer buf) {
super(buf);
//System.out.println("ResourceRecord start: " + start);
this.name = new Name(buf);
this.start = this.name.end;
this.end = this.start + 10 + getRDataLen();
}
public Name getName() {
return name;
}
public int getType() {
return readU16(0);
}
public int getClassCode() {
return readU16(2);
}
public int getTtl() {
return readI32(4);
}
public void setTtl(final int ttl) {
writeI32(4, ttl);
}
public int getRDataLen() {
return readU16(8);
}
@Override
public String toString() {
return "ResourceRecord{" +
"name=" + getName() +
", type=" + getType() +
", classCode=" + getClassCode() +
", ttl=" + getTtl() +
", rDataLen=" + getRDataLen() +
'}';
}
}

40
src/main/java/com/moparisthebest/dns/listen/Listener.java Normal file
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package com.moparisthebest.dns.listen;
import com.moparisthebest.dns.net.ParsedUrl;
import com.moparisthebest.dns.resolve.Resolver;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Arrays;
import java.util.concurrent.ExecutorService;
public interface Listener extends Runnable, AutoCloseable {
public static Listener of(final String listener, final Resolver resolver, final ExecutorService executor) {
/*
listener = listener.trim().toLowerCase();
final String[] hostPort = listener.substring(6).split(":");
//System.out.println("hostPort: " + Arrays.toString(hostPort));
final SocketAddress socketAddress = new InetSocketAddress(hostPort[0], Integer.parseInt(hostPort[1]));
//System.out.println("socketAddress: " + socketAddress);
if(listener.startsWith("tcp://")) {
return new TcpAsync(socketAddress, resolver, executor);
} else if(listener.startsWith("udp://")) {
return new UdpSync(socketAddress, resolver, executor);
}
*/
final ParsedUrl parsedUrl = ParsedUrl.of(listener);
switch(parsedUrl.getProtocol()) {
case "tcp":
return new TcpAsync(parsedUrl.getAddr(), resolver, executor);
case "udp":
return new UdpSync(parsedUrl.getAddr(), resolver, executor);
}
throw new IllegalArgumentException("invalid listener format");
}
public static Listener ofAndStart(final String listener, final Resolver resolver, final ExecutorService executor) {
final Listener ret = of(listener, resolver, executor);
executor.execute(ret);
return ret;
}
}

103
src/main/java/com/moparisthebest/dns/listen/TcpAsync.java Normal file
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package com.moparisthebest.dns.listen;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.net.BufChan;
import com.moparisthebest.dns.net.FullReadCompletionHandler;
import com.moparisthebest.dns.net.FullWriteCompletionHandler;
import com.moparisthebest.dns.net.FunctionalCompletionHandler;
import com.moparisthebest.dns.resolve.Resolver;
import java.io.IOException;
import java.net.SocketAddress;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousServerSocketChannel;
import java.nio.channels.AsynchronousSocketChannel;
import java.util.concurrent.ExecutorService;
public class TcpAsync implements Listener {
private final FunctionalCompletionHandler<AsynchronousSocketChannel, AsynchronousServerSocketChannel> newConnection = new FunctionalCompletionHandler<AsynchronousSocketChannel, AsynchronousServerSocketChannel>() {
@Override
public void completed(final AsynchronousSocketChannel sock, final AsynchronousServerSocketChannel listener) {
listener.accept(listener, this); // get ready for next connection
// callback 2
BufChan.forTcp(sock).read(dnsSizeRead);
}
};
private final FullReadCompletionHandler dnsRequestRead, dnsSizeRead;
private final SocketAddress local;
private boolean running = true;
private Thread thisThread = null;
public TcpAsync(final SocketAddress local, final Resolver resolver, final ExecutorService executor) {
this.local = local;
dnsRequestRead = new FullReadCompletionHandler() {
@Override
public void completed(final BufChan bufChan) {
try {
bufChan.buf.flip();
bufChan.setRequest(new Packet(bufChan.buf));
//debugPacket(bufChan.getRequest().getBuf().array());
resolver.resolveAsync(bufChan).thenAcceptAsync((bc) -> {
//debugPacket(bc.getResponse().getBuf().array());
bc.tcpHead.clear();
bc.tcpHead.putShort((short) bc.getResponse().getBuf().capacity());
bc.tcpHead.rewind();
bc.buf = bc.tcpHead;
bc.write((FullWriteCompletionHandler) (bc2) -> {
//System.out.println("header write complete");
bc2.buf = bc2.getResponse().getBuf();
bc2.buf.rewind();
bc2.write((FullWriteCompletionHandler) (unused) -> {
//System.out.println("body write complete");
});
});
}, executor);
} catch (Exception e) {
e.printStackTrace();
}
BufChan.forTcp(bufChan.sock).read(dnsSizeRead);
}
};
dnsSizeRead = bc -> {
final int dnsPacketSize = Short.toUnsignedInt(bc.tcpHead.getShort(0));
//System.out.println("dnsPacketSize: " + dnsPacketSize);
bc.buf = ByteBuffer.allocate(dnsPacketSize);
// read the actual packet
bc.read(dnsRequestRead);
};
}
@Override
public void run() {
try (final AsynchronousServerSocketChannel listener = AsynchronousServerSocketChannel.open()) {
listener.setOption(StandardSocketOptions.SO_REUSEADDR, true);
listener.bind(local);
listener.accept(listener, newConnection);
thisThread = Thread.currentThread();
while (running) Thread.sleep(Long.MAX_VALUE);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
// just stop
}
}
@Override
public void close() {
running = false;
if (thisThread != null)
thisThread.interrupt();
}
}

74
src/main/java/com/moparisthebest/dns/listen/UdpSync.java Normal file
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package com.moparisthebest.dns.listen;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.net.*;
import com.moparisthebest.dns.resolve.Resolver;
import java.io.IOException;
import java.net.*;
import java.nio.ByteBuffer;
import java.util.concurrent.ExecutorService;
public class UdpSync implements Listener {
private final int maxPacketLength = 2048;
private final SocketAddress local;
private final Resolver resolver;
private final ExecutorService executor;
private boolean running = true;
private Thread thisThread = null;
public UdpSync(final SocketAddress local, final Resolver resolver, final ExecutorService executor) {
this.local = local;
this.resolver = resolver;
this.executor = executor;
}
@Override
public void run() {
try (final DatagramSocket ss = new DatagramSocket(local)) {
final DatagramPacket request = new DatagramPacket(new byte[maxPacketLength], maxPacketLength);
thisThread = Thread.currentThread();
while (running) {
ss.receive(request);
//System.out.println("got packet");
final UdpRequestResponse requestResponse = new UdpRequestResponse(request.getSocketAddress(),
new Packet(ByteBuffer.wrap(request.getData(), request.getOffset(), request.getLength()).slice()));
//System.out.println(requestResponse);
//debugPacket(request.getData());
resolver.resolveAsync(requestResponse).thenAcceptAsync((urr) -> {
//debugPacket(bc.getResponse().getBuf().array());
//System.out.println("got response");
final byte[] response = urr.getResponse().getBuf().array();
final DatagramPacket responsePacket = new DatagramPacket(response, response.length); // todo: always exact length? meh
responsePacket.setSocketAddress(urr.getRequester());
try {
ss.send(responsePacket);
} catch (IOException e) {
e.printStackTrace();
}
//System.out.println("sent packet");
}, executor);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void close() {
running = false;
if (thisThread != null)
thisThread.interrupt();
}
}

44
src/main/java/com/moparisthebest/dns/net/BufChan.java Normal file
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package com.moparisthebest.dns.net;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.resolve.BaseRequestResponse;
import com.moparisthebest.dns.resolve.RequestResponse;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.CompletableFuture;
public class BufChan extends BaseRequestResponse {
public final ByteBuffer tcpHead;
public final AsynchronousSocketChannel sock;
public ByteBuffer buf;
public BufChan(final ByteBuffer buf, final ByteBuffer tcpHead, final AsynchronousSocketChannel sock) {
this.buf = buf;
this.tcpHead = tcpHead;
this.sock = sock;
}
public static BufChan forTcp(final AsynchronousSocketChannel sock) {
final ByteBuffer buf = ByteBuffer.allocateDirect(2);
return new BufChan(buf, buf, sock);
}
public final void read(final CompletionHandler<Integer,? super BufChan> handler)
{
this.sock.read(this.buf, this, handler);
}
public final void flipWrite(final CompletionHandler<Integer,? super BufChan> handler)
{
this.buf.flip();
this.write(handler);
}
public final void write(final CompletionHandler<Integer,? super BufChan> handler)
{
this.sock.write(this.buf, this, handler);
}
}

6
src/main/java/com/moparisthebest/dns/net/FullBufChanCompletionHandler.java Normal file
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package com.moparisthebest.dns.net;
@FunctionalInterface
public interface FullBufChanCompletionHandler {
void completed(BufChan bc);
}

27
src/main/java/com/moparisthebest/dns/net/FullReadCompletionHandler.java Normal file
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package com.moparisthebest.dns.net;
import java.io.IOException;
public interface FullReadCompletionHandler extends FunctionalCompletionHandler<Integer, BufChan>, FullBufChanCompletionHandler {
@Override
default void completed(final Integer result, final BufChan bc) {
if (result == -1) {
try {
//System.out.println("closing");
bc.sock.close();
} catch (IOException e) {
e.printStackTrace();
}
return;
} else if(bc.buf.hasRemaining()) {
// full read not completed
bc.sock.read(bc.buf, bc, this);
return;
}
completed(bc);
}
default FullReadCompletionHandler getThisFullReadCompletionHandler() {
return this;
}
}

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src/main/java/com/moparisthebest/dns/net/FullWriteCompletionHandler.java Normal file
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package com.moparisthebest.dns.net;
import java.io.IOException;
public interface FullWriteCompletionHandler extends FunctionalCompletionHandler<Integer, BufChan>, FullBufChanCompletionHandler {
@Override
default void completed(final Integer result, final BufChan bc) {
if (bc.buf.hasRemaining()) {
bc.sock.write(bc.buf, bc, this);
} else {
bc.buf.clear();
}
completed(bc);
}
default FullWriteCompletionHandler getThisFullWriteCompletionHandler() {
return this;
}
}

18
src/main/java/com/moparisthebest/dns/net/FunctionalCompletionHandler.java Normal file
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package com.moparisthebest.dns.net;
import java.nio.channels.CompletionHandler;
@FunctionalInterface
public interface FunctionalCompletionHandler<V,A> extends CompletionHandler<V,A> {
@Override
void completed(V result, A attachment);
@Override
default void failed(final Throwable e, final A attachment) {
e.printStackTrace();
}
default FunctionalCompletionHandler<V,A> getThisFunctionalCompletionHandler() {
return this;
}
}

184
src/main/java/com/moparisthebest/dns/net/ParsedUrl.java Normal file
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package com.moparisthebest.dns.net;
import eu.geekplace.javapinning.java7.Java7Pinning;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import java.net.*;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.*;
public class ParsedUrl {
private final SocketAddress addr;
private final URI uri; // minus #
private final Map<String, String> props; // after #, split by ;
private final Proxy proxy;
private final SSLSocketFactory sslSocketFactory;
public ParsedUrl(final SocketAddress addr, final URI uri, final Map<String, String> props, final Proxy proxy, final SSLSocketFactory sslSocketFactory) {
this.addr = addr;
this.uri = uri;
this.props = props;
this.proxy = proxy;
this.sslSocketFactory = sslSocketFactory;
}
public static ParsedUrl of(final String urlStr) {
return of(urlStr, null);
}
public static ParsedUrl of(final String urlStr, final Map<String, String> upperLevelProps) {
try {
final URI url = new URI(urlStr.trim());
final SocketAddress addr = new InetSocketAddress(url.getHost(), getPort(url));
final Map<String, String> props = upperLevelProps == null ? new HashMap<>() : new HashMap<>(upperLevelProps);
if(url.getFragment() != null)
Arrays.stream(url.getFragment().split(";"))
.map(p -> p.split("=", 2)).forEach(p -> props.put(p[0], p.length > 1 ? p[1] : null));
Proxy proxy = null;
final String proxyStr = props.get("proxy");
if (proxyStr != null) {
final URI proxyUrl = new URI(proxyStr);
if(proxyUrl.getPort() == -1)
throw new RuntimeException("proxy url must define port");
Proxy.Type type = null;
if (proxyUrl.getScheme().toLowerCase().startsWith("socks"))
type = Proxy.Type.SOCKS;
else if (proxyUrl.getScheme().toLowerCase().startsWith("http"))
type = Proxy.Type.HTTP;
else
throw new RuntimeException("proxy url must be socks or http");
proxy = new Proxy(type, new InetSocketAddress(proxyUrl.getHost(), proxyUrl.getPort()));
}
SSLSocketFactory sslSocketFactory = null;
final String pubKeyPinsSha256 = props.get("pubKeyPinsSha256");
if (pubKeyPinsSha256 != null) {
final String[] pins = pubKeyPinsSha256.split(",");
// todo: ugh java-pinning only supports hex not base64 *and* hashes the cert one time per pin, fix this
for (int x = 0; x < pins.length; ++x) {
pins[x] = "SHA256:" + bytesToHex(Base64.getDecoder().decode(pins[x]));
}
final SSLContext sslContext;
try {
sslContext = Java7Pinning.forPins(pins);
} catch (KeyManagementException | NoSuchAlgorithmException e) {
throw new RuntimeException("invalid pins", e);
}
sslSocketFactory = sslContext.getSocketFactory();
}
if(sslSocketFactory == null && url.getScheme().equals("tls"))
sslSocketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
return new ParsedUrl(addr, url, props, proxy, sslSocketFactory);
} catch (Exception e) {
if (e instanceof RuntimeException)
throw (RuntimeException) e;
throw new RuntimeException("invalid URL format: '" + urlStr + "'", e);
}
}
private static int getPort(final URI uri) {
final int port = uri.getPort();
if(port != -1)
return port;
switch (uri.getScheme()) {
case "tcp":
case "udp":
return 53;
case "tls":
return 853;
case "http":
return 80;
case "https":
return 443;
}
return port;
}
public String getProtocol() {
return uri.getScheme().toLowerCase();
}
public URL getUrlWithoutFragment() {
return toUrlRemoveRef(uri);
}
public SocketAddress getAddr() {
return addr;
}
public URI getUri() {
return uri;
}
public Map<String, String> getProps() {
return props;
}
public Proxy getProxy() {
return proxy;
}
public SSLSocketFactory getSslSocketFactory() {
return sslSocketFactory;
}
private static URL toUrlRemoveRef(final URI uri) {
// mostly copied from java.net.URLStreamHandler.toExternalForm
try {
final URL u = uri.toURL();
// pre-compute length of StringBuffer
int len = u.getProtocol().length() + 1;
if (u.getAuthority() != null && u.getAuthority().length() > 0)
len += 2 + u.getAuthority().length();
if (u.getPath() != null) {
len += u.getPath().length();
}
if (u.getQuery() != null) {
len += 1 + u.getQuery().length();
}
/*
if (u.getRef() != null)
len += 1 + u.getRef().length();
*/
final StringBuilder result = new StringBuilder(len);
result.append(u.getProtocol());
result.append(":");
if (u.getAuthority() != null && u.getAuthority().length() > 0) {
result.append("//");
result.append(u.getAuthority());
}
if (u.getPath() != null) {
result.append(u.getPath());
}
if (u.getQuery() != null) {
result.append('?');
result.append(u.getQuery());
}
/*
if (u.getRef() != null) {
result.append("#");
result.append(u.getRef());
}
*/
return new URL(result.toString());
} catch (MalformedURLException e) {
throw new RuntimeException("invalid URL format: " + uri.toString());
}
}
private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
private static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}

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src/main/java/com/moparisthebest/dns/net/UdpRequestResponse.java Normal file
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package com.moparisthebest.dns.net;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.resolve.BaseRequestResponse;
import java.net.SocketAddress;
public class UdpRequestResponse extends BaseRequestResponse {
private final SocketAddress requester;
public UdpRequestResponse(final SocketAddress requester, final Packet request) {
super(request);
this.requester = requester;
}
public SocketAddress getRequester() {
return requester;
}
@Override
public String toString() {
return "UdpRequestResponse{" +
"requester=" + requester +
"} " + super.toString();
}
}

91
src/main/java/com/moparisthebest/dns/resolve/AbstractQueueProcessingResolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
public abstract class AbstractQueueProcessingResolver implements QueueProcessingResolver {
protected final int maxRetries;
protected final String name;
protected ExecutorService executor;
protected BlockingQueue<RequestResponse> queue;
private boolean running = false;
private Thread thisThread = null;
public AbstractQueueProcessingResolver(final int maxRetries, final String name) {
this.maxRetries = maxRetries;
this.name = name;
}
@Override
public void start(final ExecutorService executor, final BlockingQueue<RequestResponse> queue) {
this.executor = executor;
this.queue = queue;
this.running = true;
executor.execute(this);
}
@Override
public <E extends RequestResponse> CompletableFuture<E> resolveAsync(final E requestResponse) {
return null;
/*
return CompletableFuture.supplyAsync(() -> {
requestResponse.setResponse(resolve(requestResponse.getRequest()));
return requestResponse;
}, executor);
*/
}
@Override
public void run() {
thisThread = Thread.currentThread();
if (running)
try {
//System.err.println(name + " getting from queue");
final RequestResponse requestResponse = queue.take();
//System.err.println(name + " got from queue");
Packet response = null;
try {
response = resolve(requestResponse.getRequest());
} catch (Exception e) {
//e.printStackTrace();
System.err.println("FAILURE: " + name + ": " + e.getMessage());
}
if(response == null) {
// failed
if (requestResponse.getAndIncrementFailureCount() < maxRetries) {
//System.err.println(name + " putting in queue");
queue.put(requestResponse);
//System.err.println(name + " put in queue");
} else {
//System.err.println(name + " maxRetries reached SRVFAIL");
@SuppressWarnings("unchecked") final CompletableFuture<RequestResponse> cf = (CompletableFuture<RequestResponse>) requestResponse.getCompletableFuture();
cf.completeExceptionally(new Exception("SRVFAIL"));
}
} else {
requestResponse.setResponse(response);
//System.err.println(name + " got response: " + requestResponse.getResponse());
@SuppressWarnings("unchecked") final CompletableFuture<RequestResponse> cf = (CompletableFuture<RequestResponse>) requestResponse.getCompletableFuture();
//System.err.println(name + " completed: " + cf.complete(requestResponse));
cf.complete(requestResponse);
}
} catch (InterruptedException e) {
throw new RuntimeException("socketresolver take", e);
} finally {
if (running)
executor.execute(this);
}
}
@Override
public void close() {
running = false;
if (thisThread != null)
thisThread.interrupt();
}
}

79
src/main/java/com/moparisthebest/dns/resolve/BaseRequestResponse.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.CompletableFuture;
public class BaseRequestResponse implements RequestResponse {
private Packet request, response;
private CompletableFuture<? extends RequestResponse> completableFuture;
private Object requestPacketKey;
private int failureCount;
public BaseRequestResponse() {
}
public BaseRequestResponse(final Packet request) {
this.request = request;
}
@Override
public Packet getRequest() {
return request;
}
public void setRequest(final Packet request) {
this.request = request;
}
@Override
public Packet getResponse() {
return response;
}
@Override
public void setResponse(final Packet response) {
this.response = response;
}
@Override
public CompletableFuture<? extends RequestResponse> getCompletableFuture() {
return completableFuture;
}
@Override
public void setCompletableFuture(final CompletableFuture<? extends RequestResponse> completableFuture) {
this.completableFuture = completableFuture;
}
@Override
public Object getRequestPacketKey() {
return requestPacketKey;
}
@Override
public void setRequestPacketKey(final Object requestPacketKey) {
this.requestPacketKey = requestPacketKey;
}
@Override
public final int getAndIncrementFailureCount() {
return ++failureCount;
}
@Override
public String toString() {
return "BaseRequestResponse{" +
"request=" + request +
", response=" + response +
", completableFuture=" + completableFuture +
", requestPacketKey=" + requestPacketKey +
", failureCount=" + failureCount +
'}';
}
}

145
src/main/java/com/moparisthebest/dns/resolve/CacheResolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.dto.Question;
import java.util.concurrent.*;
import static com.moparisthebest.dns.Util.supplyAsyncOnTimeOut;
public class CacheResolver implements Resolver, AutoCloseable {
private final int minTtl, staleResponseTtl;
private final long staleResponseTimeout;
private final BlockingQueue<RequestResponse> queue;
private final ExecutorService executor;
private final ScheduledExecutorService scheduledExecutorService;
private final ConcurrentMap<Object, CachedPacket> cache = new ConcurrentHashMap<>();
public CacheResolver(final int minTtl, final int staleResponseTtl, final long staleResponseTimeout, final int packetQueueLength, final ExecutorService executor, final ScheduledExecutorService scheduledExecutorService) {
this.minTtl = minTtl;
this.staleResponseTtl = staleResponseTtl;
this.staleResponseTimeout = staleResponseTimeout;
this.queue = packetQueueLength < 1 ? new LinkedBlockingQueue<>() : new ArrayBlockingQueue<>(packetQueueLength);
this.executor = executor;
this.scheduledExecutorService = scheduledExecutorService;
}
public CacheResolver startQueueProcessingResolvers(final Iterable<QueueProcessingResolver> queueProcessingResolvers) {
for(final QueueProcessingResolver queueProcessingResolver : queueProcessingResolvers)
queueProcessingResolver.start(this.executor, this.queue);
return this;
}
@Override
public void close() {
}
private class CachedPacket {
final Packet response;
final long receivedSeconds, expiredSeconds;
public CachedPacket(final Packet response, final long receivedSeconds, final long expiredSeconds) {
this.response = response;
this.receivedSeconds = receivedSeconds;
this.expiredSeconds = expiredSeconds;
}
boolean isExpired(final long currentSeconds) {
return currentSeconds > expiredSeconds;
}
Packet getStaleResponse() {
return response.copy().modTtls((ttl) -> staleResponseTtl);
}
Packet getResponse(final long currentSeconds) {
final int timePassed = (int)(currentSeconds - receivedSeconds);
return response.copy().modTtls((ttl) -> ttl - timePassed);
}
@Override
public String toString() {
return "CachedPacket{" +
"response=" + response +
", receivedSeconds=" + receivedSeconds +
", expiredSeconds=" + expiredSeconds +
'}';
}
}
private static long currentTimeSeconds() {
return System.currentTimeMillis() / 1000L;
}
private String calcRequestPacketKey(final Packet request) {
//debugPacket(request.getBuf().array());
//System.out.println("request: " + request);
final StringBuilder sb = new StringBuilder();
// concat all query domains and types (todo: order maybe shouldn't matter meh)
for (final Question q : request.getQuestions())
sb.append(q.getName().getDomain()).append('|').append(q.getQType()).append('|');
// also append whether dnssec is ok or not
sb.append(request.isDnssecOk() ? 'Y' : 'N');
return sb.toString();
}
@Override
public <E extends RequestResponse> CompletableFuture<E> resolveAsync(final E requestResponse) {
final String key = calcRequestPacketKey(requestResponse.getRequest());
//System.out.println("requestPacketKey: " + key);
final CachedPacket response = cache.get(key);
//System.out.println("cachedPacket: " + response);
if (response != null) {
final long currentTime = currentTimeSeconds();
if (response.isExpired(currentTime)) {
//System.out.println("cachedPacket isExpired!");
requestResponse.setRequestPacketKey(key);
final CompletableFuture<E> request = requestAndCache(requestResponse);
final CompletableFuture<E> stale = supplyAsyncOnTimeOut(scheduledExecutorService, staleResponseTimeout, TimeUnit.MILLISECONDS, () -> {
requestResponse.setResponse(response.getStaleResponse().setId(requestResponse.getRequest().getId()));
return requestResponse;
});
return request.applyToEitherAsync(stale, s -> s);
} else {
//System.out.println("cachedPacket returning from cache!");
requestResponse.setResponse(response.getResponse(currentTime).setId(requestResponse.getRequest().getId()));
return CompletableFuture.completedFuture(requestResponse);
}
}
requestResponse.setRequestPacketKey(key);
return requestAndCache(requestResponse);
}
//boolean first = true;
private <E extends RequestResponse> CompletableFuture<E> requestAndCache(final E requestResponse) {
CompletableFuture<E> request = new CompletableFuture<>();
requestResponse.setCompletableFuture(request);
//if(first) {
//first = false;
queue.add(requestResponse);
//}
if(minTtl > 0) {
request = request.thenApply(s -> {
s.getResponse().modTtls((ttl) -> Math.max(ttl, minTtl));
//s.getResponse().modTtls((ttl) -> 30);
return s;
});
}
request.thenAcceptAsync(s -> {
final Packet response = s.getResponse().copy(); // todo: do we need to copy?
final long currentTime = currentTimeSeconds();
cache.put(s.getRequestPacketKey(), new CachedPacket(response, currentTime, currentTime + response.getLowestTtl()));
}, executor);
return request;
}
@Override
public Packet resolve(final Packet request) throws Exception {
return resolveAsync(new BaseRequestResponse(request)).get().getResponse();
}
}

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src/main/java/com/moparisthebest/dns/resolve/HttpResolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;
import java.net.*;
import static com.moparisthebest.dns.Util.readPacket;
public class HttpResolver extends AbstractQueueProcessingResolver {
private final OpenConnection openConnection;
private final int connectTimeout;
interface OpenConnection {
HttpURLConnection open() throws Exception;
}
public HttpResolver(final int maxRetries, final String name, final URL url, final int connectTimeout, final Proxy proxy, final SSLSocketFactory sslSocketFactory) {
super(maxRetries, name);
this.connectTimeout = connectTimeout;
if(proxy == null && sslSocketFactory == null) {
openConnection = () -> (HttpURLConnection) url.openConnection();
} else if(proxy != null && sslSocketFactory == null) {
openConnection = () -> (HttpURLConnection) url.openConnection(proxy);
} else if(proxy == null
//&& sslSocketFactory != null
) {
openConnection = () -> {
final HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setSSLSocketFactory(sslSocketFactory);
return conn;
};
} else //if(proxy != null && sslSocketFactory != null)
{
openConnection = () -> {
final HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(proxy);
conn.setSSLSocketFactory(sslSocketFactory);
return conn;
};
}
}
@Override
public Packet resolve(final Packet request) throws Exception {
final HttpURLConnection conn = openConnection.open();
conn.setConnectTimeout(connectTimeout);
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/dns-udpwireformat");
conn.setRequestProperty("Accept", "application/dns-udpwireformat");
//conn.connect();
try (OutputStream os = conn.getOutputStream()) {
os.write(request.getBuf().array());
os.flush();
try (InputStream is = conn.getInputStream();
DataInputStream dis = new DataInputStream(is);) {
final int responseCode = conn.getResponseCode();
//System.out.println("responseCode: " + responseCode);
final int contentLength = conn.getContentLength();
//System.out.println("contentLength: " + contentLength);
return readPacket(contentLength, dis);
}
}
}
}

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src/main/java/com/moparisthebest/dns/resolve/QueueProcessingResolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.net.ParsedUrl;
import javax.net.SocketFactory;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
public interface QueueProcessingResolver extends Resolver, Runnable, AutoCloseable {
void start(final ExecutorService executor, final BlockingQueue<RequestResponse> queue);
public static QueueProcessingResolver of(final String resolver, final Map<String, String> upperLevelProps) {
return of(ParsedUrl.of(resolver, upperLevelProps));
}
public static QueueProcessingResolver of(final String resolver) {
return of(ParsedUrl.of(resolver));
}
public static QueueProcessingResolver of(final ParsedUrl parsedUrl) {
final int maxRetries = Integer.parseInt(parsedUrl.getProps().getOrDefault("maxRetries", "5"));
String name = parsedUrl.getProps().get("name");
if(name == null)
name = parsedUrl.getUri().toString();
final int connectTimeout = Integer.parseInt(parsedUrl.getProps().getOrDefault("connectTimeout", "500"));
switch(parsedUrl.getProtocol()) {
case "tcp":
case "tls":
return new SocketResolver(maxRetries, name, parsedUrl.getAddr(), connectTimeout, parsedUrl.getProxy(), parsedUrl.getSslSocketFactory());
case "http":
case "https":
return new HttpResolver(maxRetries, name, parsedUrl.getUrlWithoutFragment(), connectTimeout, parsedUrl.getProxy(), parsedUrl.getSslSocketFactory());
}
throw new IllegalArgumentException("invalid listener format");
}
}

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src/main/java/com/moparisthebest/dns/resolve/RequestResponse.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import java.util.concurrent.CompletableFuture;
public interface RequestResponse {
Packet getRequest();
Packet getResponse();
void setResponse(Packet response);
/**
* These should only be used by resolvers, may be null
CompletableFuture<RequestResponse> getCompletableFuture();
void setCompletableFuture(CompletableFuture<RequestResponse> completableFuture);
<E extends RequestResponse> CompletableFuture<E> getCompletableFuture();
<E extends RequestResponse> void setCompletableFuture(CompletableFuture<E> completableFuture);
*/
CompletableFuture<? extends RequestResponse> getCompletableFuture();
void setCompletableFuture(CompletableFuture<? extends RequestResponse> completableFuture);
Object getRequestPacketKey();
void setRequestPacketKey(Object key);
int getAndIncrementFailureCount();
}

17
src/main/java/com/moparisthebest/dns/resolve/Resolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import com.moparisthebest.dns.listen.Listener;
import com.moparisthebest.dns.listen.TcpAsync;
import com.moparisthebest.dns.listen.UdpSync;
import javax.net.SocketFactory;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
public interface Resolver {
<E extends RequestResponse> CompletableFuture<E> resolveAsync(E requestResponse);
Packet resolve(Packet request) throws Exception;
}

114
src/main/java/com/moparisthebest/dns/resolve/SocketResolver.java Normal file
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package com.moparisthebest.dns.resolve;
import com.moparisthebest.dns.dto.Packet;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.*;
import static com.moparisthebest.dns.Util.readTcpPacket;
import static com.moparisthebest.dns.Util.tryClose;
import static com.moparisthebest.dns.Util.writeTcpPacket;
public class SocketResolver extends AbstractQueueProcessingResolver {
private final OpenSocket openConnection;
interface OpenSocket {
Socket open() throws Exception;
}
public SocketResolver(final int maxRetries, final String name, final SocketAddress endpoint, final int connectTimeout, final Proxy proxy, final SSLSocketFactory sslSocketFactory) {
super(maxRetries, name);
if(proxy == null && sslSocketFactory == null) {
openConnection = () -> {
Socket s = null;
try {
s = new Socket();
s.connect(endpoint, connectTimeout);
return s;
} catch(Throwable e) {
tryClose(s);
throw e;
}
};
} else if(proxy != null && sslSocketFactory == null) {
openConnection = () -> {
Socket s = null;
try {
s = new Socket(proxy);
s.connect(endpoint, connectTimeout);
return s;
} catch(Throwable e) {
tryClose(s);
throw e;
}
};
} else if(proxy == null
//&& sslSocketFactory != null
) {
openConnection = () -> {
Socket s = null;
try {
s = sslSocketFactory.createSocket();
s.connect(endpoint, connectTimeout);
return s;
} catch(Throwable e) {
tryClose(s);
throw e;
}
};
} else //if(proxy != null && sslSocketFactory != null)
{
// https://stackoverflow.com/questions/5783832/socks5-proxy-using-sslsocket
final String proxyHost = ((InetSocketAddress)proxy.address()).getHostString();
final int proxyPort = ((InetSocketAddress)proxy.address()).getPort();
openConnection = () -> {
Socket s = null;
try {
s = new Socket(proxy);
s.connect(endpoint, connectTimeout);
return (SSLSocket) sslSocketFactory.createSocket(
s,
proxyHost,
proxyPort,
true);
} catch(Throwable e) {
tryClose(s);
throw e;
}
};
}
}
@Override
public Packet resolve(final Packet request) throws Exception {
/*
final SocketFactory socketFactory = SocketFactory.getDefault();
final SSLContext sslContext = Java7Pinning.forPin("SHA256:c22904de360003a8d0997613affadb1de10f982efc750c196d0a7a59daec784b");
final SocketFactory socketFactory = sslContext.getSocketFactory();
final Socket upstream = socketFactory.createSocket("89.233.43.71", 853);
final Socket upstream = socketFactory.createSocket("8.8.4.4", 53);
final SocketFactory socketFactory = SocketFactory.getDefault();
try (Socket upstream = socketFactory.createSocket()) {
upstream.connect(endpoint, 500);
*/
try (Socket upstream = openConnection.open();
InputStream upIs = upstream.getInputStream();
DataInputStream upDis = new DataInputStream(upIs);
OutputStream upOs = upstream.getOutputStream();
DataOutputStream upDos = new DataOutputStream(upOs)) {
writeTcpPacket(request, upDos);
upDos.flush();
return readTcpPacket(upDis);
}
}
}