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37fb2ce4c6414c741d749a288038be98bad6161b
ettore.dreucci.it/public/blog/ispconfig-ddns/index.html
Ettore 37fb2ce4c6 Added first blog post, activated taxonomies 
Signed-off-by: Ettore <noettore@gmail.com>
2019-05-24 23:14:20 +02:00

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<meta name="description" content="GNU/Linux Nerd">
<meta property="og:site_name" content="Ettore Dreucci" />
<meta property="og:locale" content="en-US" />
<meta property="og:type" content="article" />
<meta property="og:url" content="https://ettore.dreucci.it/blog/ispconfig-ddns/" />
<meta property="og:title" content="ISPConfig Dynamic DNS" />
<meta property="twitter:title" content="ISPConfig Dynamic DNS">
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<meta property="og:description" content="How to create and update a DDNS entry in ISPConfig">
<meta property="twitter:description" content="How to create and update a DDNS entry in ISPConfig">
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Ettore Dreucci - ISPConfig Dynamic DNS
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ISPConfig Dynamic DNS
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<div class="desc">How to create and update a DDNS entry in ISPConfig</div>
<div class="meta">
<div class="date" title="Wed 22 May 2019 18:54:00 CEST">22 May 2019</div>
<div class="reading-time middot">3 minute read</div>
<div class="tags">
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<li class="middot"><a href="https://ettore.dreucci.it/tags/ispconfig">ispconfig</a> </li>
<li class="middot"><a href="https://ettore.dreucci.it/tags/ddns">ddns</a> </li>
<li class="middot"><a href="https://ettore.dreucci.it/tags/dns">dns</a> </li>
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<p>If you manage your DNS server(s) with ISPConfig you may want a <em>dynamic entry</em> that gets updated automatically every time the target host changes its IP address.</p>
<p>Doing so in ISPConfig is quite straight forward: we can use the <a href="https://git.ispconfig.org/ispconfig/ispconfig3/tree/master/remoting_client">ISPConfig SOAP API</a> to update an <u>existing record</u> with a PHP script to be run frequently by the target host.</p>
<p>In this <a href="https://ettore.dreucci.it/categories/recipe/"><strong>recipe</strong></a> I will consider <strong>updating an A record</strong>.</p>
<ol>
<li><p>First we need to create a remote user on the ISPConfig master server to authenticate, and grant it remote access and some functions:</p>
<p>In “System -&gt; Remote User” add a new remote user, enable remote access and <strong>grant</strong> “<u>DNS zone functions</u>” and <u>each DNS functions corresponding to the type of record you want to update</u>: <strong>so if you want to update an A record you must grant the generic “DNS zone functions” and the “DNS a functions”</strong></p></li>
<li><p>We then have to write a PHP script that will make a SOAP function call to the ISPConfig endpoint. <u>The target host</u>, or the host executing the script <u>must have the <a href="https://www.php.net/manual/en/book.soap.php">PHP SOAP module</a> installed</u>.</p>
<p>Create the <code>update.php</code> script as follow:</p>
<pre><code>&lt;?php
require('config.php');
if ($argc&lt;3) {
print &quot;Usage: php ./update.php HOST DOMAIN [IP]\n&quot;;
print &quot;If not given, the ip address will be queried from icanhazip.com\n&quot;;
die();
}
// First parameter: hostname of DNS entry
$ddns_host = $argv[1];
// Second: domain name of DNS zone
$domain = $argv[2];
// If third parameter is present
if ($argc&gt;3) {
// Third parameter: IP address of target host
$ip = $argv[3];
// Otherwise
} else {
// Figure out the public IP of this host:
$ip = trim(file_get_contents(&quot;http://icanhazip.com/&quot;));
if (filter_var($ip, FILTER_VALIDATE_IP) === false) {
die(&quot;Unable to retrieve public IP address (icanhazip.com returned $ip)\n&quot;);
}
}
print(&quot;Setting DDNS host $ddns_host.$domain to IP $ip\n&quot;);
// Using the SOAP module initialize a SoapClient
$client = new SoapClient(null,
array('location' =&gt; $soap_location,
'uri' =&gt; $soap_uri,
'trace' =&gt; 1,
'exceptions' =&gt; 1));
try {
// Login to SOAP server
$session_id = $client-&gt;login($soap_user, $soap_password);
// Grab DNS zone ID
$zone_id = $client-&gt;dns_zone_get_id($session_id, $domain);
// Grab DNS zone
$zone = $client-&gt;dns_zone_get($session_id, $zone_id);
// Grab DNS records
$records = $client-&gt;dns_rr_get_all_by_zone($session_id, $zone_id);
// Find right record: hostname must match and type must be A
$dns_record = null;
foreach ($records as $rec) {
if ($rec['type']=='A' &amp;&amp; $rec['name']==$ddns_host) {
$dns_record = $rec;
}
}
// If no record found
if (is_null($dns_record)) {
//Logout from SOAP server
$client-&gt;logout($session_id);
die(&quot;Unable to find DNS record for host $ddns_host in domain $domain on the server...\n&quot;);
}
// If IP stored in record is different from current IP
if ($dns_record['data'] != $ip) {
// Set new IP
$dns_record['data'] = $ip;
// Increment record serial number
$dns_record['serial'] = $dns_record['serial']+1;
// Update modified record in DNS server
$client-&gt;dns_a_update($session_id, null, $dns_record['id'], $dns_record);
// Increment zone serial number
$zone['serial'] = $zone['serial'] + 1;
// Update modified zone in DNS server
$client-&gt;dns_zone_update($session_id, 0, $zone_id, $zone);
print(&quot;Successfully set DNS entry for host $ddns_host in domain $domain to $ip.\n&quot;);
// Otherwise
} else {
print(&quot;IP address of $ddns_host.$domain already set to $ip.\n&quot;);
}
//Logout from SOAP server
$client-&gt;logout($session_id);
} catch (SoapFault $e) {
die('SOAP Error: '.$e-&gt;getMessage().&quot;\n&quot;);
}
?&gt;
</code></pre>
<p>Create the <code>config.php</code> as follow:</p>
<pre><code>&lt;?php
$soap_location = 'https://ispconfig.example.com:8080/remote/index.php';
$soap_uri = 'https://ispconfig.example.com:8080/remote/';
$soap_user = 'username';
$soap_password = 'password';
</code></pre></li>
<li><p>Schedule the execution of <code>update.php</code></p></li>
</ol>
<p>END.</p>
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