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<title>cwrap - resolv_wrapper</title>
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<h1>The resolv_wrapper library</h1>
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<p>A wrapper for DNS name resolving or DNS faking.</p>
<br />
<p align="center">
<a class="btn btn-warning btn-lg" role="button" href="./download.html#resolv_wrapper"><span class="glyphicon glyphicon-random"></span> Clone with git</a> ยท
<a class="btn btn-danger btn-lg" role="button" href="https://bugzilla.samba.org/enter_bug.cgi?product=cwrap"><span class="glyphicon glyphicon-send"></span> Report a bug</a>
</p>
<br />
<p>resolv_wrapper makes it possible on most UNIX platforms
to contact your own DNS implmentation in your test
environment. It requires socket_wrapper to be able to
contact the server. Alternatively, the wrapper is able to
fake DNS queries and return valid responses to your
application.</p>
<h2>Features</h2>
<ul>
<li>Redirects name queries to the nameservers specified
in your <em>resolv.conf</em>.</li>
<li>Can fake DNS queries using a simple formatted DNS
hosts file.</li>
</ul>
<h2>Detailed descriptions</h2>
<p>If you want to use your own <em>resolv.conf</em> you
can set the envionment variable
<code>RESOLV_WRAPPER_CONF</code> to point to a file you
created. The format of the file is defined in the manpage
<code>resolv.conf(5)</code></p>
<p>If you do not have a DNS server running but still want
to be able that your application or a third party library
can do DNS queries, we provide a simple way to do that. All
you have to do is to set the environment variable
<code>RESOLV_WRAPPER_HOSTS</code>.<br /> It must point to a
hosts-like text file that specifies fake records for custom
queries. The format of the file looks like this:</p>
<pre>
TYPE RECORD_NAME RECORD_VALUE
</pre>
<h3>For example:</h3>
<pre>
A dc.cwrap.org 127.0.0.10
AAAA dc.cwrap.org fd00::5357:5f0a
CNAME kerberos.cwrap.org dc.cwrap.org
SRV _kerberos._tcp.cwrap.org kerberos.cwrap.org 88
SOA cwrap.org ns1.cwrap.org admin.cwrap.org 2014100457 3600 300 1814400
</pre>
<p>
The SRV record can optionally also include priority and weight:
</p>
<pre>
SRV _ldap._tcp.cwrap.org ldap.cwrap.org 389 1 5
</pre>
<p>
If unset, the priority defaults to 1 and weight defaults to 100.
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<h3>Contact</h3>
<p><a href="https://lists.samba.org/mailman/listinfo/samba-technical" target="_blank">samba-technical@lists.samba.org</a></p>
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<h3>Credits</h3>
<p>Jakub Hrozek<br />
Andreas Schneider</p>
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