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The Hoa\Dns library. 2017-01-10 10:50 UTC



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Hoa is a modular, extensible and structured set of PHP libraries.
Moreover, Hoa aims at being a bridge between industrial and research worlds.


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This library allows to create a domain name resolver.

Learn more.


With Composer, to include this library into your dependencies, you need to require hoa/dns:

$ composer require hoa/dns '~3.0'

For more installation procedures, please read the Source page.


Before running the test suites, the development dependencies must be installed:

$ composer install

Then, to run all the test suites:

$ vendor/bin/hoa test:run

For more information, please read the contributor guide.

Quick usage

As a quick overview, we propose to create our own resolution server for the top level domain .hoa. We start by modifying the local resolver in order to add a new resolution host: ours.

Specify a resolution server

On Mac OS X, the simplest way is to write in /etc/resolver/hoa the following declarations:

port 57005

On Linux, we will use DNSMasq (often already installed). Then, we edit the file /etc/dnsmasq.conf by adding:


And do not forget to restart:

$ sudo /etc/init.d/dnsmasq restart
 * Restarting DNS forwarder and DHCP server dnsmasq    [OK]

For Windows, it is more complicated. You should read the documentation.

Create a resolution server

Well, now, we will create our resolution server that will listen (57005 = 0xDEAD) in UDP. Thus, in the Resolution.php file:

$dns = new Hoa\Dns\Resolver(
    new Hoa\Socket\Server('udp://')
$dns->on('query', function (Hoa\Event\Bucket $bucket) {
    $data = $bucket->getData();

        'Resolving domain ', $data['domain'],
        ' of type ', $data['type'], "\n";

    return '';

All query for the top level domain .hoa will be resolved to (note: we do not look at the type, which should be A or AAAA respectively for IPv4 and IPv6).

Finally, let say we have a HTTP server that runs on and the index responds yeah \o/, then we start our resolver:

$ php Resolver.php

And we make an HTTP request on foo.hoa (that will be resolve to

$ curl foo.hoa --verbose
* About to connect() to foo.hoa port 80 (#0)
*   Trying connected
* Connected to foo.hoa ( port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/a.b.c (…) libcurl/d.e.f
> OpenSSL/g.h.i zlib/j.k.l
> Host: foo.hoa:80
> Accept: */*
< HTTP/1.1 200 OK
< Date: …
< Server: …
< Content-Type: text/html
< Content-Length: 8
yeah \o/
* Connection #0 to host foo.hoa left intact
* Closing connection #0

We see that foo.hoa is resolved to!


The hack book of Hoa\Dns contains detailed information about how to use this library and how it works.

To generate the documentation locally, execute the following commands:

$ composer require --dev hoa/devtools
$ vendor/bin/hoa devtools:documentation --open

More documentation can be found on the project's website: hoa-project.net.

Getting help

There are mainly two ways to get help:


Do you want to contribute? Thanks! A detailed contributor guide explains everything you need to know.


Hoa is under the New BSD License (BSD-3-Clause). Please, see LICENSE for details.

Related projects

The following projects are using this library:

  • ec2dns, ec2dns is a set of command line tools that makes it easy to display public hostnames of EC2 instances and ssh into them via their tag name.