<chapter xmlns="http://docbook.org/ns/docbook"
         xmlns:xlink="http://www.w3.org/1999/xlink"
         xmlns:xi="http://www.w3.org/2001/XInclude"
         version="5.0"
         xml:id="sec-dnscrypt-proxy">
 <title>DNSCrypt client proxy</title>
 <para>
  The DNSCrypt client proxy relays DNS queries to a DNSCrypt enabled upstream
  resolver. The traffic between the client and the upstream resolver is
  encrypted and authenticated, mitigating the risk of MITM attacks, DNS
  poisoning attacks, and third-party snooping (assuming the upstream is
  trustworthy).
 </para>
 <sect1 xml:id="sec-dnscrypt-proxy-configuration">
  <title>Basic configuration</title>

  <para>
   To enable the client proxy, set
<programlisting>
<xref linkend="opt-services.dnscrypt-proxy.enable"/> = true;
    </programlisting>
  </para>

  <para>
   Enabling the client proxy does not alter the system nameserver; to relay
   local queries, prepend <literal>127.0.0.1</literal> to
   <option>networking.nameservers</option>.
  </para>
 </sect1>
 <sect1 xml:id="sec-dnscrypt-proxy-forwarder">
  <title>As a forwarder for another DNS client</title>

  <para>
   To run the DNSCrypt proxy client as a forwarder for another DNS client,
   change the default proxy listening port to a non-standard value and point
   the other client to it:
<programlisting>
<xref linkend="opt-services.dnscrypt-proxy.localPort"/> = 43;
    </programlisting>
  </para>

  <sect2 xml:id="sec-dnscrypt-proxy-forwarder-dsnmasq">
   <title>dnsmasq</title>
   <para>
<programlisting>
{
  <xref linkend="opt-services.dnsmasq.enable"/> = true;
  <xref linkend="opt-services.dnsmasq.servers"/> = [ "127.0.0.1#43" ];
}
    </programlisting>
   </para>
  </sect2>

  <sect2 xml:id="sec-dnscrypt-proxy-forwarder-unbound">
   <title>unbound</title>
   <para>
<programlisting>
{
  <xref linkend="opt-services.unbound.enable"/> = true;
  <xref linkend="opt-services.unbound.forwardAddresses"/> = [ "127.0.0.1@43" ];
}
    </programlisting>
   </para>
  </sect2>
 </sect1>
</chapter>
