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<title>Ocamlnet 4 Reference Manual : Uq_resolver</title>
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<h1>Module <a href="type_Uq_resolver.html">Uq_resolver</a></h1>
<pre><span id="MODULEUq_resolver"><span class="keyword">module</span> Uq_resolver</span>: <code class="code">sig</code> <a href="Uq_resolver.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Support for pluggable resolvers</p>
</div>
</div>
<hr width="100%">
<p>A resolver maps several kinds of names to addresses, or vice versa.
Currently, only DNS host lookups are supported (but this can be extended
if needed).</p>
<p>The plugin mechanism allows one to change the name resovler Ocamlnet
uses. Resolvers can be both synchronous or asynchronous. Note however,
that the default resolver is synchronous and simply bases on
<code class="code">Unix.gethostbyname</code>.</p>
<p>Requirements of the resolver:</p>
<ul>
<li>IP addresses may be enclosed in square brackets, but also given without
such brackets. If such an IP address is passed to the resolver, the
string address is just converted to a <code class="code">Unix.inet_addr</code>.</li>
</ul>
<h2 id="1_AsynchronousInterface">Asynchronous Interface</h2><p>The following types are the same as in <a href="Uq_engines.html"><code class="code">Uq_engines</code></a>, here only
redefined for systematic reasons</p>
<pre><span id="TYPEengine_state"><span class="keyword">type</span> <code class="type">'t</code> engine_state</span> = <code class="type">[ `Aborted | `Done of 't | `Error of exn | `Working of int ]</code> </pre>
<pre><span id="TYPEengine"><span class="keyword">class type</span> <code class="type">['t]</code> <a href="Uq_resolver.engine-c.html">engine</a></span> = <code class="code">object</code> <a href="Uq_resolver.engine-c.html">..</a> <code class="code">end</code></pre><p>Exceptions</p>
<pre><span id="EXCEPTIONHost_not_found"><span class="keyword">exception</span> Host_not_found</span> <span class="keyword">of</span> <code class="type">string</code></pre>
<div class="info ">
<div class="info-desc">
<p>This host cannot be resolved</p>
</div>
</div>
<p>The type of resolvers:</p>
<pre><span id="TYPEresolver"><span class="keyword">class type</span> <a href="Uq_resolver.resolver-c.html">resolver</a></span> = <code class="code">object</code> <a href="Uq_resolver.resolver-c.html">..</a> <code class="code">end</code></pre><h2 id="1_SynchronousInterface">Synchronous Interface</h2>
<pre><span id="VALget_host_by_name"><span class="keyword">val</span> get_host_by_name</span> : <code class="type">?resolver:<a href="Uq_resolver.resolver-c.html">resolver</a> -> string -> Unix.host_entry</code></pre><div class="info ">
<div class="info-desc">
<p>Look up the host, and return the host entry
or raise the exception <code class="code">Host_not_found</code>.</p>
<p>If a <code class="code">resolver</code> is passed, this resolver is used, otherwise the
pluggable resolver is used.</p>
</div>
</div>
<pre><span id="VALsockaddr_of_socksymbol"><span class="keyword">val</span> sockaddr_of_socksymbol</span> : <code class="type">?resolver:<a href="Uq_resolver.resolver-c.html">resolver</a> -> <a href="Netsockaddr.html#TYPEsocksymbol">Netsockaddr.socksymbol</a> -> Unix.sockaddr</code></pre><div class="info ">
<div class="info-desc">
<p>Use the resolver to look up names in <a href="Netsockaddr.html#TYPEsocksymbol"><code class="code">Netsockaddr.socksymbol</code></a>,
and convert the symbol to a <code class="code">Unix.sockaddr</code> only containing IP
addresses.</p>
<p>If a <code class="code">resolver</code> is passed, this resolver is used, otherwise the
pluggable resolver is used.</p>
</div>
</div>
<h2 id="1_Resolvers">Resolvers</h2>
<pre><span id="VALdefault_resolver"><span class="keyword">val</span> default_resolver</span> : <code class="type">unit -> <a href="Uq_resolver.resolver-c.html">resolver</a></code></pre><div class="info ">
<div class="info-desc">
<p>The default resolver uses <code class="code">Unix.gethostbyname</code> to look up names.
Note that this means that no IPv6 addresses are returned.</p>
</div>
</div>
<pre><span id="VALgai_resolver"><span class="keyword">val</span> gai_resolver</span> : <code class="type">?ipv4:bool -> ?ipv6:bool -> unit -> <a href="Uq_resolver.resolver-c.html">resolver</a></code></pre><div class="info ">
<div class="info-desc">
<p>This resolver uses <code class="code">Unix.getaddrinfo</code>. One can set whether IPv4
or IPv6 addresses may be returned (only one type is returned).
The order of addresses cannot
be set, but there is a global config file <code class="code">/etc/gai.info</code>.</p>
<p>The <code class="code">h_aliases</code> field of the result is not set.</p>
<p>By default, both <code class="code">ipv4</code> and <code class="code">ipv6</code> are enabled.</p>
</div>
</div>
<h2 id="1_Plugins">Plugins</h2>
<pre><span id="VALcurrent_resolver"><span class="keyword">val</span> current_resolver</span> : <code class="type">unit -> <a href="Uq_resolver.resolver-c.html">resolver</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the pluggable resolver. Unless overridden by
<code class="code">set_current_resolver</code>, the returned resolver depends on the result
of <a href="Netsys.html#VALis_ipv6_system"><code class="code">Netsys.is_ipv6_system</code></a>.</p>
</div>
</div>
<pre><span id="VALset_current_resolver"><span class="keyword">val</span> set_current_resolver</span> : <code class="type"><a href="Uq_resolver.resolver-c.html">resolver</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Set the pluggable resolver</p>
</div>
</div>
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