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<title>utmps - a secure utmp implementation</title>
<meta name="Description" content="utmps - a secure utmp implementation" />
<meta name="Keywords" content="utmps utmp utmpx unix login accounting wtmp laurent bercot skarnet" />
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> utmps </h1>
<h2> What is it ? </h2>
<p>
utmps is an implementation of the <tt>utmpx.h</tt> family of functions
performing user accounting on Unix systems.
</p>
<p>
Traditionally, <tt>utmp</tt> functionality is provided by the system's
libc. However, not all libcs implement utmp: for instance the
<a href="https://musl-libc.org/">musl</a> libc, on Linux, does not. The
main reason for it is that <tt>utmp</tt> functionality is difficult to
implement in a secure way; in particular, it is impossible to implement
without either running a daemon or allowing arbitrary programs to tamper
with user accounting.
</p>
<p>
<tt>utmps</tt> is a secure implementation of user accounting, using
a daemon as the only authority to manage the utmp and wtmp data; programs
running utmp functions are just clients to this daemon.
</p>
<hr />
<ul>
<li> <a href="overview.html">An overview of utmps</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
2.11.1.0 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/">s6</a> version
2.11.0.1 or later. It's a <em>run-time</em> requirement only, to run
the utmpd and wtmpd services (and can be done without if you have a
suitable replacement for
<a href="//skarnet.org/software/s6/s6-ipcserver.html">s6-ipcserver</a>). </li>
</ul>
<h3> Licensing </h3>
<p>
utmps 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 utmps is <a href="utmps-0.1.1.0.tar.gz">0.1.1.0</a>. </li>
<li> Alternatively, you can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/utmps/">utmps
git repository</a>:
<pre> git clone git://git.skarnet.org/utmps </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/utmps">GitHub mirror</a>
of the utmps 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 utmps and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<ul>
<li><a href="utmps-utmpd.html">The <tt>utmps-utmpd</tt> program</a></li>
<li><a href="utmps-wtmpd.html">The <tt>utmps-wtmpd</tt> program</a></li>
<li><a href="utmps-write.html">The <tt>utmps-write</tt> program</a></li>
</ul>
<h3> Libraries </h3>
<ul>
<li> <a href="libutmps/">The <tt>utmps</tt> library interface</a> </li>
<li> <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/utmpx.h.html">The
<tt>utmpx.h</tt> library interface</a> is implemented on top of the utmps library. </li>
<li> <a href="http://man7.org/linux/man-pages/man3/logwtmp.3.html">The <tt>logwtmp()</tt>
and <tt>updwtmpx()</tt> functions</a> are also implemented. </li>
</ul>
<hr />
<a name="related">
<h2> Related resources </h2>
</a>
<h3> utmps discussion </h3>
<ul>
<li> <tt>utmps</tt> is discussed on the
<a href="//skarnet.org/lists/#skaware">skaware</a> mailing-list. </li>
</ul>
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