pfSense

define('DYNDNS_PROVIDER_VALUES', 'dnsomatic dyndns dyndns-static dyndns-custom dhs dyns easydns noip ods zoneedit loopia freedns dnsexit opendns namecheap he-net he-net-tunnelbroker selfhost route53 custom');

define('DYNDNS_PROVIDER_DESCRIPTIONS', 'DNS-O-Matic, DynDNS (dynamic),DynDNS (static),DynDNS (custom),DHS,DyNS,easyDNS,No-IP,ODS.org,ZoneEdit,Loopia,freeDNS, DNSexit, OpenDNS, Namecheap, HE.net, HE.net Tunnelbroker, SelfHost, Route 53, Custom');

function dyndnsCheckIP($int) {

	$ip_address = get_interface_ip($int);

	if (is_private_ip($ip_address)) {

		$hosttocheck = "checkip.dyndns.org";

		$checkip = gethostbyname($hosttocheck);

		$ip_ch = curl_init("http://{$checkip}");

		curl_setopt($ip_ch, CURLOPT_RETURNTRANSFER, 1);

		curl_setopt($ip_ch, CURLOPT_SSL_VERIFYPEER, FALSE);

		curl_setopt($ip_ch, CURLOPT_INTERFACE, $ip_address);

		$ip_result_page = curl_exec($ip_ch);

		curl_close($ip_ch);

		$ip_result_decoded = urldecode($ip_result_page);

		preg_match('=Current IP Address: (.*)</body>=siU', $ip_result_decoded, $matches);

		$ip_address = trim($matches[1]);

	}

	return $ip_address;

}