#!/usr/bin/php
<?php

define("CONST_DEBUG", false);

foreach (getopt("u:p:") as $param => $value) {
	switch($param) {
		case 'u':
			$username = $value;
			break;
		case 'p':
			$password = $value;
			break;
	}
}

if (!isset($username) || !isset($password)) {
	echo "
	check_dyndns_logon.php	1.1		May 13 2013

	Logs on to dyn.com and validate that logon was OK.
	Can be used to keep your free account alive. (Don't execute once a minute... :-))

	Requirements: php_curl

	Usage:
	check_dyndns_logon.php -u username -p password
	\n";
	exit;
} 

$ch = curl_init();

if($ch) {

	// Create temporary cookie storage
	$ckfile = tempnam ("/tmp", "CURLCOOKIE");

	// Retrieve logon page to extract multiform code
	curl_setopt ($ch, CURLOPT_URL, "https://account.dyn.com/entrance/");
	curl_setopt ($ch, CURLOPT_TIMEOUT,60);
	curl_setopt ($ch, CURLOPT_HEADER,0);
	curl_setopt ($ch, CURLOPT_HTTPGET, 1);
	curl_setopt ($ch, CURLOPT_COOKIEJAR, $ckfile);
	curl_setopt ($ch, CURLOPT_VERBOSE, CONST_DEBUG);
	curl_setopt ($ch, CURLOPT_AUTOREFERER, 1);
	curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);
	curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0);
	$r = curl_exec ($ch);

	$filename = "/tmp/check_dyndns_logon_logonpage.html";
	if(CONST_DEBUG) { file_put_contents($filename, $r); }

	if($r!="") {
		// Extract multiform value from html
		$searchstr = "<input type='hidden' name='multiform' value='";
		$mfpos = strpos($r, $searchstr) + strlen($searchstr);
		$mfend = strpos($r, "'", $mfpos);
		$mf = substr($r, $mfpos, $mfend - $mfpos);

		$filename = "/tmp/check_dyndns_logon_multiform.txt";
		if(CONST_DEBUG) { file_put_contents($filename, $mf); }

		// POST logon data
		$postdata = "username=" . $username . "&password=" . $password . "&iov_id=&submit=Log+in&multiform=" . $mf;
		curl_setopt ($ch, CURLOPT_URL, "https://account.dyn.com/entrance/");
		curl_setopt ($ch, CURLOPT_TIMEOUT,60);
		curl_setopt ($ch, CURLOPT_HEADER,1);
		curl_setopt ($ch, CURLOPT_POST, 1);
		curl_setopt ($ch, CURLOPT_COOKIEFILE, $ckfile);
		curl_setopt ($ch, CURLOPT_VERBOSE, CONST_DEBUG);
		curl_setopt ($ch, CURLOPT_AUTOREFERER, 1);
		curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
		curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata);
		curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);
		curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0);
		$r = curl_exec ($ch);

		$filename = "/tmp/check_dyndns_logon_postdata.txt";
		if(CONST_DEBUG) { file_put_contents($filename, $postdata); }

		$filename = "/tmp/check_dyndns_logon_result.html";
		if(CONST_DEBUG) { file_put_contents($filename, $r); }

		
		// Find welcome string in http code
		$searchstr = $username;
		if(strpos($r, $searchstr)) {
			echo "OK: Sucessfully logged on to dyn.com with account: $username\n";
			$exitcode = 0;
		} else {
			echo "WARNING: Could NOT logon to dyn.com with account: $username\n";
			$exitcode = 1;
		}
	} else {
		echo "UNKNOWN: Could not contact dyn.com\n";
		$exitcode = 3;
	}

	curl_close($ch);
	if(isset($ckfile)) { unlink($ckfile); }
} else {
	echo "UNKNOWN: Could initiate CURL\n";
	$exitcode = 3;
}
exit($exitcode);
?>