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<div class="section" id="creating-a-custom-server">
<h1>Creating a custom server<a class="headerlink" href="#creating-a-custom-server" title="Permalink to this headline">¶</a></h1>
<p>The builtin DNS server plugin is useful,
but the beauty of Twisted Names is that you can build your own custom servers and clients using the names components.</p>
<blockquote>
<div><ul class="simple">
<li>In this section you will learn about the components required to build a simple DNS server.</li>
<li>You will then learn how to create a custom DNS server which calculates responses dynamically.</li>
</ul>
</div></blockquote>
<div class="section" id="a-simple-forwarding-dns-server">
<h2>A simple forwarding DNS server<a class="headerlink" href="#a-simple-forwarding-dns-server" title="Permalink to this headline">¶</a></h2>
<p>Lets start by creating a simple forwarding DNS server, which forwards all requests to an upstream server (or servers).</p>
<p><a class="reference download internal" href="../../_downloads/simple_server.py"><code class="xref download docutils literal"><span class="pre">simple_server.py</span></code></a></p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Copyright (c) Twisted Matrix Laboratories.</span>
<span class="c"># See LICENSE for details.</span>
<span class="sd">"""</span>
<span class="sd">An example of a simple non-authoritative DNS server.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">twisted.internet</span> <span class="kn">import</span> <span class="n">reactor</span>
<span class="kn">from</span> <span class="nn">twisted.names</span> <span class="kn">import</span> <span class="n">client</span><span class="p">,</span> <span class="n">dns</span><span class="p">,</span> <span class="n">server</span>
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Run the server.</span>
<span class="sd"> """</span>
<span class="n">factory</span> <span class="o">=</span> <span class="n">server</span><span class="o">.</span><span class="n">DNSServerFactory</span><span class="p">(</span>
<span class="n">clients</span><span class="o">=</span><span class="p">[</span><span class="n">client</span><span class="o">.</span><span class="n">Resolver</span><span class="p">(</span><span class="n">resolv</span><span class="o">=</span><span class="s">'/etc/resolv.conf'</span><span class="p">)]</span>
<span class="p">)</span>
<span class="n">protocol</span> <span class="o">=</span> <span class="n">dns</span><span class="o">.</span><span class="n">DNSDatagramProtocol</span><span class="p">(</span><span class="n">controller</span><span class="o">=</span><span class="n">factory</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">listenUDP</span><span class="p">(</span><span class="mi">10053</span><span class="p">,</span> <span class="n">protocol</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">listenTCP</span><span class="p">(</span><span class="mi">10053</span><span class="p">,</span> <span class="n">factory</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SystemExit</span><span class="p">(</span><span class="n">main</span><span class="p">())</span>
</pre></div>
</div>
<p>In this example we are passing a <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.client.Resolver.html">client.Resolver</a> instance
to the <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.server.DNSServerFactory.html">DNSServerFactory</a>
and we are configuring that client to use the upstream DNS servers which are specified in a local <code class="docutils literal"><span class="pre">resolv.conf</span></code> file.</p>
<p>Also note that we start the server listening on both UDP and TCP ports.
This is a standard requirement for DNS servers.</p>
<p>You can test the server using <code class="docutils literal"><span class="pre">dig</span></code>.
For example:</p>
<div class="highlight-console"><div class="highlight"><pre><span class="gp">$</span> dig -p <span class="m">10053</span> @127.0.0.1 example.com SOA +short
<span class="go">sns.dns.icann.org. noc.dns.icann.org. 2013102791 7200 3600 1209600 3600</span>
</pre></div>
</div>
</div>
<div class="section" id="a-server-which-computes-responses-dynamically">
<h2>A server which computes responses dynamically<a class="headerlink" href="#a-server-which-computes-responses-dynamically" title="Permalink to this headline">¶</a></h2>
<p>Now suppose we want to create a bespoke DNS server which responds to certain hostname queries
by dynamically calculating the resulting IP address, while passing all other queries to another DNS server.
Queries for hostnames matching the pattern <strong>workstation{0-9}+</strong>
will result in an IP address where the last octet matches the workstation number.</p>
<p>We’ll write a custom resolver which we insert before the standard client resolver.
The custom resolver will be queried first.</p>
<p>Here’s the code:</p>
<p><a class="reference download internal" href="../../_downloads/override_server.py"><code class="xref download docutils literal"><span class="pre">override_server.py</span></code></a></p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Copyright (c) Twisted Matrix Laboratories.</span>
<span class="c"># See LICENSE for details.</span>
<span class="sd">"""</span>
<span class="sd">An example demonstrating how to create a custom DNS server.</span>
<span class="sd">The server will calculate the responses to A queries where the name begins with</span>
<span class="sd">the word "workstation".</span>
<span class="sd">Other queries will be handled by a fallback resolver.</span>
<span class="sd">eg</span>
<span class="sd"> python doc/names/howto/listings/names/override_server.py</span>
<span class="sd"> $ dig -p 10053 @localhost workstation1.example.com A +short</span>
<span class="sd"> 172.0.2.1</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">twisted.internet</span> <span class="kn">import</span> <span class="n">reactor</span><span class="p">,</span> <span class="n">defer</span>
<span class="kn">from</span> <span class="nn">twisted.names</span> <span class="kn">import</span> <span class="n">client</span><span class="p">,</span> <span class="n">dns</span><span class="p">,</span> <span class="n">error</span><span class="p">,</span> <span class="n">server</span>
<span class="k">class</span> <span class="nc">DynamicResolver</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A resolver which calculates the answers to certain queries based on the</span>
<span class="sd"> query type and name.</span>
<span class="sd"> """</span>
<span class="n">_pattern</span> <span class="o">=</span> <span class="s">'workstation'</span>
<span class="n">_network</span> <span class="o">=</span> <span class="s">'172.0.2'</span>
<span class="k">def</span> <span class="nf">_dynamicResponseRequired</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Check the query to determine if a dynamic response is required.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">query</span><span class="o">.</span><span class="n">type</span> <span class="o">==</span> <span class="n">dns</span><span class="o">.</span><span class="n">A</span><span class="p">:</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">'.'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">labels</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_pattern</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">def</span> <span class="nf">_doDynamicResponse</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Calculate the response to a query.</span>
<span class="sd"> """</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">name</span>
<span class="n">labels</span> <span class="o">=</span> <span class="n">name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">'.'</span><span class="p">)</span>
<span class="n">parts</span> <span class="o">=</span> <span class="n">labels</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_pattern</span><span class="p">)</span>
<span class="n">lastOctet</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">parts</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">dns</span><span class="o">.</span><span class="n">RRHeader</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">,</span>
<span class="n">payload</span><span class="o">=</span><span class="n">dns</span><span class="o">.</span><span class="n">Record_A</span><span class="p">(</span><span class="n">address</span><span class="o">=</span><span class="n">b</span><span class="s">'</span><span class="si">%s</span><span class="s">.</span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_network</span><span class="p">,</span> <span class="n">lastOctet</span><span class="p">)))</span>
<span class="n">answers</span> <span class="o">=</span> <span class="p">[</span><span class="n">answer</span><span class="p">]</span>
<span class="n">authority</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">additional</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">return</span> <span class="n">answers</span><span class="p">,</span> <span class="n">authority</span><span class="p">,</span> <span class="n">additional</span>
<span class="k">def</span> <span class="nf">query</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Check if the query should be answered dynamically, otherwise dispatch to</span>
<span class="sd"> the fallback resolver.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_dynamicResponseRequired</span><span class="p">(</span><span class="n">query</span><span class="p">):</span>
<span class="k">return</span> <span class="n">defer</span><span class="o">.</span><span class="n">succeed</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_doDynamicResponse</span><span class="p">(</span><span class="n">query</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">defer</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">error</span><span class="o">.</span><span class="n">DomainError</span><span class="p">())</span>
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Run the server.</span>
<span class="sd"> """</span>
<span class="n">factory</span> <span class="o">=</span> <span class="n">server</span><span class="o">.</span><span class="n">DNSServerFactory</span><span class="p">(</span>
<span class="n">clients</span><span class="o">=</span><span class="p">[</span><span class="n">DynamicResolver</span><span class="p">(),</span> <span class="n">client</span><span class="o">.</span><span class="n">Resolver</span><span class="p">(</span><span class="n">resolv</span><span class="o">=</span><span class="s">'/etc/resolv.conf'</span><span class="p">)]</span>
<span class="p">)</span>
<span class="n">protocol</span> <span class="o">=</span> <span class="n">dns</span><span class="o">.</span><span class="n">DNSDatagramProtocol</span><span class="p">(</span><span class="n">controller</span><span class="o">=</span><span class="n">factory</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">listenUDP</span><span class="p">(</span><span class="mi">10053</span><span class="p">,</span> <span class="n">protocol</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">listenTCP</span><span class="p">(</span><span class="mi">10053</span><span class="p">,</span> <span class="n">factory</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SystemExit</span><span class="p">(</span><span class="n">main</span><span class="p">())</span>
</pre></div>
</div>
<p>Notice that <code class="docutils literal"><span class="pre">DynamicResolver.query</span></code> returns a <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.internet.defer.Deferred.html">Deferred</a>.
On success, it returns three lists of DNS records (answers, authority, additional),
which will be encoded by <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.dns.Message.html">dns.Message</a> and returned to the client.
On failure, it returns a <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.error.DomainError.html">DomainError</a>,
which is a signal that the query should be dispatched to the next client resolver in the list.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>The fallback behaviour is actually handled by <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.resolve.ResolverChain.html">ResolverChain</a>.</p>
<p>ResolverChain is a proxy for other resolvers.
It takes a list of <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.internet.interfaces.IResolver.html">IResolver</a> providers
and queries each one in turn until it receives an answer, or until the list is exhausted.</p>
<p>Each <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.internet.interfaces.IResolver.html">IResolver</a> in the chain may return a deferred <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.error.DomainError.html">DomainError</a>,
which is a signal that <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.resolve.ResolverChain.html">ResolverChain</a> should query the next chained resolver.</p>
<p class="last">The <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.server.DNSServerFactory.html">DNSServerFactory</a> constructor takes a list of authoritative resolvers, caches and client resolvers
and ensures that they are added to the <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.resolve.ResolverChain.html">ResolverChain</a> in the correct order.</p>
</div>
<p>Let’s use <code class="docutils literal"><span class="pre">dig</span></code> to see how this server responds to requests that match the pattern we specified:</p>
<div class="highlight-console"><div class="highlight"><pre><span class="gp">$</span> dig -p <span class="m">10053</span> @127.0.0.1 workstation1.example.com A +short
<span class="go">172.0.2.1</span>
<span class="gp">$</span> dig -p <span class="m">10053</span> @127.0.0.1 workstation100.example.com A +short
<span class="go">172.0.2.100</span>
</pre></div>
</div>
<p>And if we issue a request that doesn’t match the pattern:</p>
<div class="highlight-console"><div class="highlight"><pre><span class="gp">$</span> dig -p <span class="m">10053</span> @localhost www.example.com A +short
<span class="go">93.184.216.119</span>
</pre></div>
</div>
</div>
<div class="section" id="further-reading">
<h2>Further Reading<a class="headerlink" href="#further-reading" title="Permalink to this headline">¶</a></h2>
<p>For simplicity, the examples above use the <code class="docutils literal"><span class="pre">reactor.listenXXX</span></code> APIs.
But your application will be more flexible if you use the <a class="reference internal" href="../../core/howto/application.html"><em>Twisted Application APIs</em></a>,
along with the <a class="reference internal" href="../../core/howto/plugin.html"><em>Twisted plugin system</em></a> and <code class="docutils literal"><span class="pre">twistd</span></code>.
Read the source code of <a class="api reference external" href="https://twistedmatrix.com/documents/16.0.0/api/twisted.names.tap.html">names.tap</a> to see how the <code class="docutils literal"><span class="pre">twistd</span> <span class="pre">names</span></code> plugin works.</p>
</div>
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<li><a class="reference internal" href="#">Creating a custom server</a><ul>
<li><a class="reference internal" href="#a-simple-forwarding-dns-server">A simple forwarding DNS server</a></li>
<li><a class="reference internal" href="#a-server-which-computes-responses-dynamically">A server which computes responses dynamically</a></li>
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