pfSense

				case 'route53':		

					require_once("r53.class");

					$r53 = new Route53($this->_dnsUser, $this->_dnsPass);

					$apiurl = $r53->getApiUrl($this->_dnsZoneID);

					$xmlreq = $r53->getRequestBody($this->_dnsHost, $this->_dnsIP, $this->_dnsTTL);

					$httphead = $r53->getHttpPostHeaders(strlen($xmlreq));

						log_error(sprintf("XMLPOST: %s", $xmlreq));

<?php

/**

* r53.class for managing Amazon AWS Route53 Resources

* 

* This is a simplified version of r53.class for trivial "dynDNS" operations

* that integrates well with pfSense. Based on the original r53.class by

* Dan Myers at  http://sourceforge.net/projects/php-r53/ .

* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Copyright (c) 2011, Dan Myers.

* Parts copyright (c) 2008, Donovan Schonknecht.

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are met:

*

* - Redistributions of source code must retain the above copyright notice,

*   this list of conditions and the following disclaimer.

* - Redistributions in binary form must reproduce the above copyright

*   notice, this list of conditions and the following disclaimer in the

*   documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

*

* This is a modified BSD license (the third clause has been removed).

* The BSD license may be found here:

* http://www.opensource.org/licenses/bsd-license.php

*

* Amazon Route 53 is a trademark of Amazon.com, Inc. or its affiliates.

*

* Route53 is based on Donovan Schonknecht's Amazon S3 PHP class, found here:

* http://undesigned.org.za/2007/10/22/amazon-s3-php-class

*

* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

*

*/

class Route53

{

	protected $__accessKey; // AWS Access key

	protected $__secretKey; // AWS Secret key

	/**

	* Constructor

	*

	* @param string $accessKey Access key

	* @param string $secretKey Secret key

	* @return void

	*/

	public function __construct($accessKey = null, $secretKey = null) {

		if ($accessKey !== null && $secretKey !== null) {

			$this->setAuth($accessKey, $secretKey);

		}

	}

	/**

	* Set AWS access key and secret key

	*

	* @param string $accessKey Access key

	* @param string $secretKey Secret key

	* @return void

	*/

	public function setAuth($accessKey, $secretKey) {

		$this->__accessKey = $accessKey;

		$this->__secretKey = $secretKey;

	}

	/**

	* Return XML document for POST

	*

	* @param string $fqdn FQDN to set/update

	* @param string $ip IP to set for the FQDN

	* @param string $ttl TTL for the record

	* @return string XML document

	*/

	public function getRequestBody($fqdn, $ip, $ttl){

		$xmlreq .= "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";

		$xmlreq .= "<ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\">";

		$xmlreq .= "<ChangeBatch><Changes><Change>";

		$xmlreq .= "<Action>UPSERT</Action>";

		$xmlreq .= "<ResourceRecordSet>";

		$xmlreq .= sprintf("<Name>%s</Name>", $fqdn);

		$xmlreq .= "<Type>A</Type>";

		$xmlreq .= sprintf("<TTL>%d</TTL>", $ttl);

		$xmlreq .= sprintf("<ResourceRecords><ResourceRecord><Value>%s</Value></ResourceRecord></ResourceRecords>",	$ip);

		$xmlreq .= "</ResourceRecordSet>";

		$xmlreq .= "</Change></Changes></ChangeBatch>";

		$xmlreq .= "</ChangeResourceRecordSetsRequest>";

		return $xmlreq;

	}

	/**

	* Return API URL

	*

	* @param string $zoneid Amazone Zone ID

	* @return string URL

	*/

	public function getApiUrl($zoneid){

		return sprintf("https://route53.amazonaws.com/2013-04-01/hostedzone/%s/rrset", $zoneid);

	}

	/**

	* Return HTTP post headers 

	* 

	* @param int $bodylen length of the POST bost body

	* @return Array headers

	*/

	public function getHttpPostHeaders($bodylen){

		$reqdate = gmdate('D, d M Y H:i:s e');

		$httphead[] = array();

		$httphead[] = sprintf("Date: %s", $reqdate);

		$httphead[] = "Content-Type: text/plain";

		$httphead[] = sprintf("Content-Length: %d", $bodylen);

		/* to avoid having user to know their AWS Region, for now use V3 */

		$httphead[] = sprintf(

			"X-Amzn-Authorization: AWS3-HTTPS AWSAccessKeyId=%s,Algorithm=HMACSHA256,SignedHeaders=date,Signature=%s",

			$this->__accessKey,

			base64_encode(hash_hmac("sha256", $reqdate, $this->__secretKey, true))

		);

		return $httphead;

	}

}