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76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<!--
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fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User<div class="refentry">
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<a name="man.lwresd"></a><div class="titlepage"></div>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <div class="refnamediv">
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User<h2>Name</h2>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User<p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <span class="application">lwresd</span>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User &#8212; lightweight resolver daemon
7e71f05d8643aca84914437c900cb716444507e4Tinderbox User </p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User</div>
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
f5ae3cca1d2832239cc821bdef77e90c1739e66dTinderbox User
ec899c963c91c16c393e067996400ae244921110Tinderbox User
ec899c963c91c16c393e067996400ae244921110Tinderbox User <div class="refsynopsisdiv">
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt<h2>Synopsis</h2>
ec899c963c91c16c393e067996400ae244921110Tinderbox User <div class="cmdsynopsis"><p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <code class="command">lwresd</code>
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-c <em class="replaceable"><code>config-file</code></em></code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-C <em class="replaceable"><code>config-file</code></em></code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-d <em class="replaceable"><code>debug-level</code></em></code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-f</code>]
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt [<code class="option">-g</code>]
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User [<code class="option">-i <em class="replaceable"><code>pid-file</code></em></code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-m <em class="replaceable"><code>flag</code></em></code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-n <em class="replaceable"><code>#cpus</code></em></code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-P <em class="replaceable"><code>port</code></em></code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-p <em class="replaceable"><code>port</code></em></code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-s</code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-t <em class="replaceable"><code>directory</code></em></code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt [<code class="option">-u <em class="replaceable"><code>user</code></em></code>]
ec899c963c91c16c393e067996400ae244921110Tinderbox User [<code class="option">-v</code>]
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt [
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User [<code class="option">-4</code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt | [<code class="option">-6</code>]
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt ]
ec899c963c91c16c393e067996400ae244921110Tinderbox User </p></div>
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt </div>
9d557856c2a19ec95ee73245f60a92f8675cf5baTinderbox User
ec899c963c91c16c393e067996400ae244921110Tinderbox User <div class="refsection">
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt<a name="id-1.14.18.7"></a><h2>DESCRIPTION</h2>
ec899c963c91c16c393e067996400ae244921110Tinderbox User
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <p><span class="command"><strong>lwresd</strong></span>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User is the daemon providing name lookup
7e71f05d8643aca84914437c900cb716444507e4Tinderbox User services to clients that use the BIND 9 lightweight resolver
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User library. It is essentially a stripped-down, caching-only name
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt server that answers queries using the BIND 9 lightweight
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User resolver protocol rather than the DNS protocol.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p><span class="command"><strong>lwresd</strong></span>
ec899c963c91c16c393e067996400ae244921110Tinderbox User listens for resolver queries on a
ec899c963c91c16c393e067996400ae244921110Tinderbox User UDP port on the IPv4 loopback interface, 127.0.0.1. This
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User means that <span class="command"><strong>lwresd</strong></span> can only be used by
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt processes running on the local machine. By default, UDP port
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User number 921 is used for lightweight resolver requests and
ec899c963c91c16c393e067996400ae244921110Tinderbox User responses.
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User </p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User Incoming lightweight resolver requests are decoded by the
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt server which then resolves them using the DNS protocol. When
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater the DNS lookup completes, <span class="command"><strong>lwresd</strong></span> encodes
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater the answers in the lightweight resolver format and returns
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater them to the client that made the request.
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater </p>
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater <p>
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater If <code class="filename">/etc/resolv.conf</code> contains any
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <code class="option">nameserver</code> entries, <span class="command"><strong>lwresd</strong></span>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt sends recursive DNS queries to those servers. This is similar
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User to the use of forwarders in a caching name server. If no
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <code class="option">nameserver</code> entries are present, or if
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User forwarding fails, <span class="command"><strong>lwresd</strong></span> resolves the
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt queries autonomously starting at the root name servers, using
ec899c963c91c16c393e067996400ae244921110Tinderbox User a built-in list of root server hints.
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt </p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User </div>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <div class="refsection">
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<a name="id-1.14.18.8"></a><h2>OPTIONS</h2>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <div class="variablelist"><dl class="variablelist">
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<dt><span class="term">-4</span></dt>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<dd>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Use IPv4 only even if the host machine is capable of IPv6.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <code class="option">-4</code> and <code class="option">-6</code> are mutually
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User exclusive.
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater </p>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User </dd>
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt<dt><span class="term">-6</span></dt>
ec899c963c91c16c393e067996400ae244921110Tinderbox User<dd>
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt <p>
ec899c963c91c16c393e067996400ae244921110Tinderbox User Use IPv6 only even if the host machine is capable of IPv4.
ec899c963c91c16c393e067996400ae244921110Tinderbox User <code class="option">-4</code> and <code class="option">-6</code> are mutually
ec899c963c91c16c393e067996400ae244921110Tinderbox User exclusive.
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater </p>
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater </dd>
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater<dt><span class="term">-c <em class="replaceable"><code>config-file</code></em></span></dt>
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater<dd>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <p>
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater Use <em class="replaceable"><code>config-file</code></em> as the
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User configuration file instead of the default,
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt <code class="filename">/etc/lwresd.conf</code>.
ec899c963c91c16c393e067996400ae244921110Tinderbox User
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt <code class="option">-c</code> can not be used with <code class="option">-C</code>.
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater </p>
7ae7246a6339bb3a79ffc9f2f9c486de9a2bf65eAutomatic Updater </dd>
ec899c963c91c16c393e067996400ae244921110Tinderbox User<dt><span class="term">-C <em class="replaceable"><code>config-file</code></em></span></dt>
ec899c963c91c16c393e067996400ae244921110Tinderbox User<dd>
ec899c963c91c16c393e067996400ae244921110Tinderbox User <p>
2cbb4ab75757fbb656997a82c14ca07db37d481aAutomatic Updater Use <em class="replaceable"><code>config-file</code></em> as the
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User configuration file instead of the default,
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <code class="filename">/etc/resolv.conf</code>.
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <code class="option">-C</code> can not be used with <code class="option">-c</code>.
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User </p>
7e71f05d8643aca84914437c900cb716444507e4Tinderbox User </dd>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User<dt><span class="term">-d <em class="replaceable"><code>debug-level</code></em></span></dt>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User<dd>
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User <p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Set the daemon's debug level to <em class="replaceable"><code>debug-level</code></em>.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Debugging traces from <span class="command"><strong>lwresd</strong></span> become
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User more verbose as the debug level increases.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </dd>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<dt><span class="term">-f</span></dt>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt<dd>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Run the server in the foreground (i.e. do not daemonize).
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </p>
cd32f419a8a5432fbb139f56ee73cbf68b9350ccTinderbox User </dd>
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater<dt><span class="term">-g</span></dt>
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater<dd>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Run the server in the foreground and force all logging
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt to <code class="filename">stderr</code>.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </dd>
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater<dt><span class="term">-i <em class="replaceable"><code>pid-file</code></em></span></dt>
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater<dd>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt <p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt Use <em class="replaceable"><code>pid-file</code></em> as the
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt PID file instead of the default,
1ca759b3f5c0672b2a66bc02288fe010cabbfe37Tinderbox User <code class="filename">/var/run/lwresd/lwresd.pid</code>.
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </p>
76786c2904942b708d8a7a4659df74da5dc9446eEvan Hunt </dd>
<dt><span class="term">-m <em class="replaceable"><code>flag</code></em></span></dt>
<dd>
<p>
Turn on memory usage debugging flags. Possible flags are
<em class="replaceable"><code>usage</code></em>,
<em class="replaceable"><code>trace</code></em>,
<em class="replaceable"><code>record</code></em>,
<em class="replaceable"><code>size</code></em>, and
<em class="replaceable"><code>mctx</code></em>.
These correspond to the ISC_MEM_DEBUGXXXX flags described in
<code class="filename">&lt;isc/mem.h&gt;</code>.
</p>
</dd>
<dt><span class="term">-n <em class="replaceable"><code>#cpus</code></em></span></dt>
<dd>
<p>
Create <em class="replaceable"><code>#cpus</code></em> worker threads
to take advantage of multiple CPUs. If not specified,
<span class="command"><strong>lwresd</strong></span> will try to determine the
number of CPUs present and create one thread per CPU.
If it is unable to determine the number of CPUs, a
single worker thread will be created.
</p>
</dd>
<dt><span class="term">-P <em class="replaceable"><code>port</code></em></span></dt>
<dd>
<p>
Listen for lightweight resolver queries on port
<em class="replaceable"><code>port</code></em>. If
not specified, the default is port 921.
</p>
</dd>
<dt><span class="term">-p <em class="replaceable"><code>port</code></em></span></dt>
<dd>
<p>
Send DNS lookups to port <em class="replaceable"><code>port</code></em>. If not
specified, the default is port 53. This provides a
way of testing the lightweight resolver daemon with a
name server that listens for queries on a non-standard
port number.
</p>
</dd>
<dt><span class="term">-s</span></dt>
<dd>
<p>
Write memory usage statistics to <code class="filename">stdout</code>
on exit.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
<p>
This option is mainly of interest to BIND 9 developers
and may be removed or changed in a future release.
</p>
</div>
</dd>
<dt><span class="term">-t <em class="replaceable"><code>directory</code></em></span></dt>
<dd>
<p>Chroot
to <em class="replaceable"><code>directory</code></em> after
processing the command line arguments, but before
reading the configuration file.
</p>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p>
This option should be used in conjunction with the
<code class="option">-u</code> option, as chrooting a process
running as root doesn't enhance security on most
systems; the way <code class="function">chroot(2)</code> is
defined allows a process with root privileges to
escape a chroot jail.
</p>
</div>
</dd>
<dt><span class="term">-u <em class="replaceable"><code>user</code></em></span></dt>
<dd>
<p>Setuid
to <em class="replaceable"><code>user</code></em> after completing
privileged operations, such as creating sockets that
listen on privileged ports.
</p>
</dd>
<dt><span class="term">-v</span></dt>
<dd>
<p>
Report the version number and exit.
</p>
</dd>
</dl></div>
</div>
<div class="refsection">
<a name="id-1.14.18.9"></a><h2>FILES</h2>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term"><code class="filename">/etc/resolv.conf</code></span></dt>
<dd>
<p>
The default configuration file.
</p>
</dd>
<dt><span class="term"><code class="filename">/var/run/lwresd.pid</code></span></dt>
<dd>
<p>
The default process-id file.
</p>
</dd>
</dl></div>
</div>
<div class="refsection">
<a name="id-1.14.18.10"></a><h2>SEE ALSO</h2>
<p><span class="citerefentry">
<span class="refentrytitle">named</span>(8)
</span>,
<span class="citerefentry">
<span class="refentrytitle">lwres</span>(3)
</span>,
<span class="citerefentry">
<span class="refentrytitle">resolver</span>(5)
</span>.
</p>
</div>
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