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<title>s6-dns: the s6-dnssrv program</title>
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<h1> The s6-dnssrv program </h1>
<p>
s6-dnssrv finds the SRV information associated to a
service name, protocol name and domain name.
</p>
<h2> Interface </h2>
<pre>
s6-dnssrv [ -q ] [ -r ] [ -t <em>timeout</em> ] <em>service</em> <em>proto</em> <em>domain</em>
</pre>
<ul>
<li> s6-dnssrv makes an SRV query for _<em>service</em>._<em>proto</em>.<em>domain</em>.
It waits for the result and prints the obtained information line by line,
then exits 0. It prints the priority, the weight, the port number and the
target, in that order, separated by spaces. </li>
<li> If the domain exists but no relevant field has been found, it exits 1. </li>
<li> If the DNS answered but no answer is available, it prints a relevant
error message and exits 2. </li>
<li> By default, s6-dnssrv looks for DNS cache addresses in the
<tt>/etc/resolv.conf</tt> file. If the DNSCACHEIP environment variable is set
and contains a list of IP (v4 or v6) addresses, separated by commas,
semicolons, spaces, tabs, newlines or carriage returns, then this list
is used instead. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-q</tt> : qualify. Qualifies <em>domain</em> before resolution,
according to suffixes found in <tt>/etc/resolv.conf</tt>. If the DNSQUALIFY
environment variable is set and contains a list of suffixes separated by spaces,
tabs, newlines or carriage returns, then this list is used instead. By
default, no qualification is used: if <em>domain</em> is not a FQDN, a dot
is just appended to it. </li>
<li> <tt>-r</tt> : random. By default, the program does not sort the
result, but prints them in the order received from the DNS. With this
option, it performs a random permutation on the results before printing
them. </li>
<li> <tt>-t</tt> <em>timeout</em> : if the resolution takes more
than <em>timeout</em> milliseconds, then it exits 99 right away with an error
message. By default, <em>timeout</em> is 0, which means no timeout. </li>
</ul>
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