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<title>s6-dns - a complete DNS client suite</title>
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> s6-dns </h1>
<h2> What is it ? </h2>
<p>
s6-dns is a suite of DNS client programs and libraries for Unix
systems, as an alternative to the BIND, djbdns or other DNS clients.
</p>
<p>
s6-dns may include its own series of DNS caches and servers at some
point in the future.
</p>
<p>
The <tt>s6-</tt> prefix is slightly misleading, and probably a naming
mistake. This package is not, stricto sensu, a part of the
<em>s6 ecosystem</em>, and it is nowhere near a requirement for a
<a href="//skarnet.org/software/s6/">s6</a>-based installation.
However, it is a requirement for
<a href="//skarnet.org/software/s6-networking/">s6-networking</a>, which
provides useful networking utilities often used with s6, so keeping the
prefix makes some kind of sense; you can see s6-dns as an extension
to the s6 ecosystem.
</p>
<hr />
<ul>
<li> <a href="getaddrinfo.html">Why a separate client library ?</a> Why not just use <tt>getaddrinfo()</tt> ?</li>
<li> <a href="libresolv.html">What is wrong with libresolv, BIND's client library ?</a></li>
</ul>
<hr />
<h2> Installation </h2>
<h3> Requirements </h3>
<ul>
<li> A POSIX-compliant system with a standard C development environment </li>
<li> GNU make, version 3.81 or later </li>
<li> <a href="//skarnet.org/software/skalibs/">skalibs</a> version
2.14.3.0 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the skalibs library. </li>
</ul>
<h3> Licensing </h3>
<p>
s6-dns 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 s6-dns is <a href="s6-dns-2.4.0.0.tar.gz">2.4.0.0</a>. </li>
<li> Alternatively, you can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/s6-dns/">s6-dns
git repository</a>:
<pre> git clone git://git.skarnet.org/s6-dns </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/s6-dns">GitHub mirror</a>
of the s6-dns 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 s6-dns and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<p>
All these commands exit 111 if they encounter a temporary error or
hardware error, and
100 if they encounter a permanent error - such as a misuse. Short-lived
commands exit 0 on success. Other exit codes are documented in the
relevant page.
</p>
<h4> Command-line DNS clients programs </h4>
<ul>
<li><a href="s6-dnsip.html">The <tt>s6-dnsip</tt> program</a></li>
<li><a href="s6-dnsip4.html">The <tt>s6-dnsip4</tt> program</a></li>
<li><a href="s6-dnsip6.html">The <tt>s6-dnsip6</tt> program</a></li>
<li><a href="s6-dnsname.html">The <tt>s6-dnsname</tt> program</a></li>
<li><a href="s6-dnsmx.html">The <tt>s6-dnsmx</tt> program</a></li>
<li><a href="s6-dnsns.html">The <tt>s6-dnsns</tt> program</a></li>
<li><a href="s6-dnssoa.html">The <tt>s6-dnssoa</tt> program</a></li>
<li><a href="s6-dnssrv.html">The <tt>s6-dnssrv</tt> program</a></li>
<li><a href="s6-dnstxt.html">The <tt>s6-dnstxt</tt> program</a></li>
</ul>
<h4> Filtering tools </h4>
<ul>
<li><a href="s6-dnsip4-filter.html">The <tt>s6-dnsip4-filter</tt> program</a></li>
<li><a href="s6-dnsip6-filter.html">The <tt>s6-dnsip6-filter</tt> program</a></li>
<li><a href="s6-dnsname-filter.html">The <tt>s6-dnsname-filter</tt> program</a></li>
</ul>
<h4> Command-line qualification </h4>
<ul>
<li><a href="s6-dnsqualify.html">The <tt>s6-dnsqualify</tt> program</a></li>
</ul>
<h4> DNS analysis and debug tools </h4>
<ul>
<li><a href="s6-dnsq.html">The <tt>s6-dnsq</tt> program</a></li>
<li><a href="s6-dnsqr.html">The <tt>s6-dnsqr</tt> program</a></li>
</ul>
<h4> Miscellaneous utilities </h4>
<ul>
<li> <a href="s6-randomip.html">The <tt>s6-randomip</tt> program</a> </li>
<li> <a href="s6-dns-hosts-compile.html">The <tt>s6-dns-hosts-compile</tt> program</a> </li>
</ul>
<h3> Libraries </h3>
<h4> Protocol implementation and synchronous resolution </h4>
<ul>
<li><a href="libs6dns/">The <tt>s6dns</tt> library interface</a></li>
</ul>
<h4> Asynchronous resolution </h4>
<ul>
<li><a href="skadns/">The <tt>skadns</tt> library interface</a></li>
</ul>
<hr />
<a name="related">
<h2> Related resources </h2>
</a>
<h3> s6-dns discussion </h3>
<ul>
<li> <tt>s6-dns</tt> is discussed on the
<a href="//skarnet.org/lists/#skaware">skaware</a> mailing-list. </li>
<li> It can also be discussed on the
<a href="https://cr.yp.to/lists.html#dns">cr.yp.to dns mailing-list</a>. </li>
</ul>
<h3> Similar work </h3>
<ul>
<li> <a href="https://www.isc.org/software/bind">BIND</a> is the most widely
used DNS software suite on the Internet. It's also arguably the most
<a href="https://cr.yp.to/djbdns/blurb/unbind.html">buggy</a>,
convoluted and impossible to understand. </li>
<li> <a href="https://cr.yp.to/djbdns.html">djbdns</a> is DJB's DNS suite.
It works very well, but is unfortunately unmaintained by the author. s6-dns
follows <a href="//skarnet.org/software/skalibs/djblegacy.html">the
same design principles</a>. </li>
</ul>
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