mailinabox/management/templates/custom-dns.html

<style>
</style>

<h2>Custom DNS</h2>

<p class="text-warning">This is an advanced configuration page.</p>

<p>It is possible to set custom DNS records on domains hosted here.</p>

<h3>Using a Secondary Nameserver</h3>

<p>If your TLD requires you to have two separate nameservers, you can either set up a secondary (aka &ldquo;slave&rdquo;) nameserver or, alternatively, set up <a href="#" onclick="return show_panel('external_dns')">external DNS</a> and ignore the DNS server on this box. If you choose to use a seconday/slave nameserver, you must find a seconday/slave nameserver service provider. Your domain name registrar or virtual cloud provider may provide this service for you. Once you set up the seconday/slave nameserver service, enter the hostname of <em>their</em> secondary nameserver:</p>

<form class="form-horizontal" role="form" onsubmit="do_set_secondary_dns(); return false;">
  <div class="form-group">
    <label for="secondarydnsHostname" class="col-sm-1 control-label">Hostname</label>
    <div class="col-sm-10">
      <input type="text" class="form-control" id="secondarydnsHostname" placeholder="ns1.cloudprovider.com">
    </div>
  </div>
  <div class="form-group">
    <div class="col-sm-offset-1 col-sm-11">
      <button type="submit" class="btn btn-primary">Update</button>
    </div>
  </div>
  <div class="form-group">
    <div class="col-sm-offset-1 col-sm-11">
      <p class="small">Clear the box to use the box itself as secondary DNS, which is the default/normal setup.</p>
    </div>
  </div>
</form>

<h3>Custom DNS API</h3>

<p>Use your box&rsquo;s DNS API to set custom DNS records on domains hosted here. For instance, you can create your own dynamic DNS service.</p>

<p>Send a POST request like this:</p>

<pre>curl -d "" --user {email}:{password} https://{{hostname}}/admin/dns/set/<b>qname</b>[/<b>rtype</b>[/<b>value</b>]]</pre>

<h4>HTTP POST parameters</h4>

<table class="table">
<thead><th>Parameter</th> <th>Value</th></thead>
<tr><td>email</td> <td>The email address of any administrative user here.</td></tr>
<tr><td>password</td> <td>That user&rsquo;s password.</td></tr>
<tr><td>qname</td> <td>The fully qualified domain name for the record you are trying to set.</td></tr>
<tr><td>rtype</td> <td>The resource type. <code>A</code> if omitted. Possible values: <code>A</code> (an IPv4 address), <code>AAAA</code> (an IPv6 address), <code>TXT</code> (a text string), or <code>CNAME</code> (an alias, which is a fully qualified domain name).</td></tr>
<tr><td>value</td> <td>The new record&rsquo;s value. If omitted, the IPv4 address of the remote host is used. This is handy for dynamic DNS! To delete a record, use &ldquo;__delete__&rdquo;.</td></tr>
</table>

<p style="margin-top: 1em">Note that <code>-d ""</code> is merely to ensure curl sends a POST request. You do not need to put anything inside the quotes. You can also pass the value using typical form encoding in the POST body.</p>

<p>Strict <a href="http://tools.ietf.org/html/rfc4408">SPF</a> and <a href="https://datatracker.ietf.org/doc/draft-kucherawy-dmarc-base/?include_text=1">DMARC</a> records will be added to all custom domains unless you override them.</p>

<h4>Examples:</h4>

<pre># sets laptop.mydomain.com to point to the IP address of the machine you are executing curl on
curl -d "" --user me@mydomain.com:###### https://{{hostname}}/admin/dns/set/laptop.mydomain.com

# sets an alias
curl -d "" --user me@mydomain.com:###### https://{{hostname}}/admin/dns/set/foo.mydomain.com/cname/bar.mydomain.com

# clears the alias
curl -d "" --user me@mydomain.com:###### https://{{hostname}}/admin/dns/set/bar.mydomain.com/cname/__delete__

# sets a TXT record using the alternate value syntax
curl -d "value=something%20here" --user me@mydomain.com:###### https://{{hostname}}/admin/dns/set/foo.mydomain.com/txt
</pre>

<script>
function show_custom_dns() {
 api(
    "/dns/secondary-nameserver",
    "GET",
    { },
    function(data) {
      $('#secondarydnsHostname').val(data.hostname ? data.hostname : '');
    });
}

function do_set_secondary_dns() {
 api(
    "/dns/secondary-nameserver",
    "POST",
    {
      hostname: $('#secondarydnsHostname').val()
    },
    function(data) {
      if (data == "") return; // nothing updated
      show_modal_error("Secondary DNS", $("<pre/>").text(data));
    },
    function(err) {
      show_modal_error("Secondary DNS", $("<pre/>").text(err));
    });
}
</script>