Namecheap Synology DSM DDNS provider

ddns_provider.conf

#Insert this at the end of /etc.defaults/ddns_provider.conf
[Namecheap]
        modulepath=/usr/syno/bin/ddns/namecheap.php
        queryurl=https://dynamicdns.park-your-domain.com/update

namecheap.php

#!/usr/bin/php -d open_basedir=/usr/syno/bin/ddns
<?php

if ($argc !== 5) {
  echo 'badparam';
  exit();
}

$account = $argv[1];
$pwd = (string)$argv[2];
$hostname = (string)$argv[3];
$ip = (string)$argv[4];

// check the hostname contains '.'
if (strpos($hostname, '.') === false) {
  echo 'badparam';
  exit();
}

// only for IPv4 format
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
  echo "badparam";
  exit();
}

$url = 'https://dynamicdns.park-your-domain.com/update?host='.$account.'&domain='.$hostname.'&password='.$pwd.'&ip='.$ip;

$req = curl_init();
curl_setopt($req, CURLOPT_URL, $url);
curl_setopt($req, CURLOPT_RETURNTRANSFER, true);
$badXmlString = curl_exec($req); // XML String returned has a wrong xml utf declaration
curl_close($req);

// Heading says content is UTF-16, but it is UTF-8, so it is manually changed here
$fixedXmlString = preg_replace('/(<\?xml[^?]+?)utf-16/i', '$1utf-8', $badXmlString);
$xml = new SimpleXMLElement($fixedXmlString);
if ($xml->ErrCount > 0) {
  $error = $xml->errors[0]->Err1;
  if (strcmp($error, "Domain name not found") === 0) {
    echo "nohost";
  } elseif (strcmp($error, "Passwords do not match") === 0) {
    echo "badauth";
  } elseif (strcmp($error, "No Records updated. A record not Found;") === 0) {
    echo "nohost";
  } else {
    echo "911 [".$error."]";
  }
} else {
  echo "good";
}

Thank you for your quick response.

Thanks for your Instructions/Steps.

Work this for you updating IP address with no error message on DSM?

Because I guess need to make some modifications to get it work, like add $xml = preg_replace('/(<\?xml[^?]+?)utf-16/i', '$1utf-8', $res); as @bloedboemmel says.

Before Update I remember to need to make this to get ir work.

These are the steps I followed and my DDNS entries are being refreshed with no issues or errors. You do not need to amend the file if you follow the steps exactly.

That should not be a blocker but, there should be only one Namecheap block in the ddns_provider.conf file, you have two of them.

I don't see anything particular in the main php file besides the $url line which is different in the example file : Yours:

$url = 'https://dynamicdns.park-your-domain.com/update?host=@&domain='.$hostname.'&password='.$pwd.'&ip='.$ip;

Mine:

$url = 'https://dynamicdns.park-your-domain.com/update?host='.$account.'&domain='.$hostname.'&password='.$pwd.'&ip='.$ip;

Thank you for your quick response.

Thanks for your Instructions/Steps.

Work this for you updating IP address with no error message on DSM?

Because I guess need to make some modifications to get it work, like add $xml = preg_replace('/(<\?xml[^?]+?)utf-16/i', '$1utf-8', $res); as @bloedboemmel says.

Before Update I remember to need to make this to get ir work.

@aalejaandro Have you tried to change your url back to the original, because yours seems odd to me. Have you tried to paste the original url and your modified url in the browser? Maybe it shows another error.

My fix you mentioned shouldn't affect your issue, it fixed all our errors, when namecheap changed their return format. This time it strangely affects only one person.
My Synology hasn't updated yet, but I suggest to run the php file with a debugger and your input, so you can find any error.

The script at the top of this gist (which now contains the modifications from @bloedboemmel) is working for me.
Couple of things that I found helpful:

1. Reading the official Namecheap documentation about performing the HTTP GET call to the URL: https://www.namecheap.com/support/knowledgebase/article.aspx/29/11/how-to-dynamically-update-the-hosts-ip-with-an-http-request/
2. The detailed instructions from @Dade-R which show the crucial step of adding the executable permission to the PHP file.

Great stuff, and thanks to all involved!

This script is still not working for me. I am using latest copy of the gist and the chmod of Namecheap.php is 755. I even added

file_put_contents('OUTPUT.txt', $fixedXmlString);

to the end of the file so I can see when the script runs and what the output is. When I go to Synology DDNS and enter:

• Hostname: DOMAIN.com
• Username/Email: @
• Password/Key: [Password_From_Namecheap]

and Test Connection, i immediately get failed message and the logs say

ddnsd.c:1741 Fail to update [DOMAIN.com] with IP [XXX.XXX.XXX.XXX] at [Namecheap]

Also, there is no OUTPUT.txt file so the PHP script did not even run.

If I manually run the namecheap.php script and pass in the parameters, it returns good and creates the file, so why does it not work when I run it from Synology?

---

Edit: I was able to get it working without having to do any sort of file editing.. I went to Synology DDNS > Customize a DDNs service provider:

• Service Provider: Namecheap2 (To distinguish from the other Namecheap script)
• Query URL: https://dynamicdns.park-your-domain.com/update?host=__USERNAME__&domain=__HOSTNAME__&password=__PASSWORD__&ip=__MYIP__

Then enter in the following settings:

• Hostname: DOMAIN.com
• Username/Email: @
• Password/Key: [Password_From_Namecheap]

Running the connection returns Normal status and actually updates the IP

Have a look here: https://arise-dream.gitbook.io/synology-notes/connectivity/ddns

This script is still not working for me. I am using latest copy of the gist and the chmod of Namecheap.php is 755. I even added

file_put_contents('OUTPUT.txt', $fixedXmlString);

to the end of the file so I can see when the script runs and what the output is. When I go to Synology DDNS and enter:

• Hostname: DOMAIN.com
• Username/Email: @
• Password/Key: [Password_From_Namecheap]

and Test Connection, i immediately get failed message and the logs say

ddnsd.c:1741 Fail to update [DOMAIN.com] with IP [XXX.XXX.XXX.XXX] at [Namecheap]

Also, there is no OUTPUT.txt file so the PHP script did not even run.

If I manually run the namecheap.php script and pass in the parameters, it returns good and creates the file, so why does it not work when I run it from Synology?

Edit: I was able to get it working without having to do any sort of file editing.. I went to Synology DDNS > Customize a DDNs service provider:

• Service Provider: Namecheap2 (To distinguish from the other Namecheap script)
• Query URL: https://dynamicdns.park-your-domain.com/update?host=__USERNAME__&domain=__HOSTNAME__&password=__PASSWORD__&ip=__MYIP__

Then enter in the following settings:

• Hostname: DOMAIN.com
• Username/Email: @
• Password/Key: [Password_From_Namecheap]

Running the connection returns Normal status and actually updates the IP