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<title>s6-networking: the minidentd program</title>
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<h1> The <tt>minidentd</tt> program </h1>
<p>
<tt>minidentd</tt> is a small
<a href="https://cr.yp.to/proto/ucspi.txt">UCSPI</a> server application
that answers IDENT requests.
</p>
<h2> Interface </h2>
<pre>
minidentd [ -v ] [ -n | -i | -r ] [ -y <em>file</em> ] [ -t <em>timeout</em> ]
</pre>
<p>
<tt>minidentd</tt> reads a series of IDENT requests on stdin and answers
them on stdout. It logs what it's doing on stderr. The environment
variables <em>x</em>LOCALIP and <em>x</em>REMOTEIP, where <em>x</em> is
the value of the PROTO environment variable, must contain the IDENT
server address and the IDENT client address, respectively.
</p>
<p>
minidentd exits 0 on success, 100 on a usage error and 111 on a system
call failure.
</p>
<p>
minidentd does not contact the network directly. It's meant to
run under a superserver like
<a href="s6-tcpserver.html">s6-tcpserver</a>. minidentd will
work with IPv4 as well as IPv6.
</p>
<h2> Options </h2>
<ul>
<li> <tt>-v</tt> : verbose mode. Log queries and replies.. </li>
<li> <tt>-n</tt> : send ERROR : HIDDEN-USER replies if
the user has a <tt>.ident</tt> file in his home directory. </li>
<li> <tt>-i</tt> : user-defined answers. The first 14 chars of the
user's <tt>.ident</tt> file, up to EOF or newline, are used instead of
the user name. If the file exists and is empty, send
ERROR : HIDDEN-USER. If it doesn't exist, send a normal reply. </li>
<li> <tt>-r</tt> : send random replies. </li>
<li> <tt>-y <em>file</em></tt> : valid with <tt>-n</tt> or <tt>-i</tt>.
Use <em>file</em> instead of <tt>.ident</tt>. </li>
<li> <tt>-t <em>timeout</em></tt> : close connection after
<em>timeout</em> milliseconds without a client request. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> minidentd works only under Linux (2.2 or later);
on other systems, it will compile and run, but report an error for every
request.
The problem is that <em>there is no portable Unix way</em> of listing active
outgoing TCP connections with the relevant uids. On Linux, minidentd parses
the <tt>/proc/net/tcp</tt> or <tt>/proc/net/tcp6</tt> virtual file. Other
systems have their own way of doing this, if you want your system to be
supported by minidentd, please contact the author. </li>
</ul>
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