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<title>dnsfunnel - A small local DNS cache daemon</title>
<meta name="Description" content="dnsfunnel - a small local DNS cache daemon" />
<meta name="Keywords" content="dnsfunnel DNS domain cache local /etc/resolv.conf resolver forwarder laurent bercot ska skarnet" />
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> dnsfunnel </h1>
<h2> What is it ? </h2>
<p>
dnsfunnel is a small daemon listening to DNS client requests over UDP
(typically from the libc's
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/getaddrinfo.html">getaddrinfo()</a>
function) and forwards them to a list of DNS caches. It provides the
client with the first answer it gets, trimming the answer so it fits
in an UDP packet.
</p>
<p>
dnsfunnel is especially useful for distributions using the
<a href="https://musl-libc.org">musl</a> libc, which does not support
TCP DNS transport. It was originally written to be used in the
<a href="https://alpinelinux.org/">Alpine Linux</a> distribution.
</p>
<hr />
<h2> Installation </h2>
<h3> Requirements </h3>
<ul>
<li> A POSIX-compliant system with a standard C development environment.
The system must also support <tt>chroot()</tt> </li>
<li> GNU make, version 3.81 or later </li>
<li> <a href="//skarnet.org/software/skalibs/">skalibs</a> version
2.10.0.0 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the skalibs
library. </li>
<li> <a href="//skarnet.org/software/s6-dns/">s6-dns</a> version
2.3.3.0 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the s6dns
library. </li>
</ul>
<h3> Licensing </h3>
<p>
dnsfunnel is free software. It is available under the
<a href="https://opensource.org/licenses/ISC">ISC license</a>.
</p>
<h3> Download </h3>
<ul>
<li> The current released version of dnsfunnel is
<a href="dnsfunnel-0.0.1.0.tar.gz">0.0.1.0</a>.
(This is a lie.
dnsfunnel is in alpha development at the moment, and only
available through git.) </li>
<li> Alternatively, you can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/dnsfunnel/">dnsfunnel
git repository</a>:
<pre> git clone git://git.skarnet.org/dnsfunnel </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/dnsfunnel">GitHub mirror</a>
of the dnsfunnel git repository. </li>
</ul>
<h3> Compilation </h3>
<ul>
<li> See the enclosed INSTALL file for installation details. </li>
</ul>
<h3> Upgrade notes </h3>
<ul>
<li> <a href="upgrade.html">This page</a> lists the differences to be aware of between
the previous versions of dnsfunnel and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<ul>
<li><a href="dnsfunnel-daemon.html">The <tt>dnsfunnel-daemon</tt> program</a></li>
<li><a href="dnsfunneld.html">The <tt>dnsfunneld</tt> program</a></li>
<li><a href="dnsfunnel-translate.html">The <tt>dnsfunnel-translate</tt> program</a></li>
</ul>
<h2> Related resources </h2>
<ul>
<li> <tt>dnsfunnel</tt> is discussed on the
<a href="//skarnet.org/lists.html#skaware">skaware</a> mailing-list. </li>
</ul>
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