';
$defaultMethod = $altMethod = '';
$info = '';
$postdata = '';
$postback = '';
$postback_array = array();
//build post string
foreach($_POST as $key=>$value) {
$postdata .= $key . "=" . urlencode(stripslashes($value)) . "&";
$postback .= $key . "=" . urlencode(stripslashes($value)) . "&";
$postback_array[$key] = $value;
}
$postback .= "cmd=_notify-validate";
$postback_array['cmd'] = "_notify-validate";
if ($postdata == '=&') {
die('IPN NOTICE :: No POST data to process -- Bad IPN data
' . print_r($_POST, true));
}
$postdata_array = $_POST;
ksort($postdata_array);
if (sizeof($postdata_array) == 0) die('Nothing to process. Please return to home page.');
// send received data back to PayPal for validation
$scheme = 'https://';
//Parse url
$web = parse_url($scheme . MODULE_PAYMENT_PAYPAL_HANDLER);
if ($checkNoChex == TRUE) $web = parse_url('https://www.nochex.com/nochex.dll/apc/apc');
if (isset($_POST['test_ipn']) && $_POST['test_ipn'] == 1) {
$web = parse_url($scheme . 'www.sandbox.paypal.com/cgi-bin/webscr');
}
//Set the port number
if($web['scheme'] == "https") {
$web['port']="443";  $web['protocol'] = "ssl://";
} else {
$web['port']="80";   $web['protocol'] = "";
}
$result = '';
$data = '';
if (function_exists('curl_init')) {
$result = doPayPalIPNCurlPostback($web, $postback, $verboseMode, $headerMode);
if (in_array($result, array('VERIFIED', 'SUCCESS', 'INVALID'))) {
echo nl2br('IPN TESTING - Response Received via CURL -- COMMUNICATIONS OKAY' . "\n');
$defaultMethod = 'CURL';
$altMethod = 'FSOCKOPEN';
}
} else {
echo nl2br('CURL not available. Will attempt to connect using fsockopen() instead.' . "\n");
}
if (!in_array($result, array('VERIFIED', 'SUCCESS', 'INVALID')) || $testBoth === TRUE) {
$result = doPayPalIPNFsockopenPostback($web, $postback);
echo nl2br('IPN TESTING - Confirmation/Validation response with fsockopen(): ' .$result . "\n');
if ($defaultMethod == '' && $result != 'FAILED') {
$defaultMethod = 'FSOCKOPEN';
$altMethod = 'CURL';
}
}
if ($defaultMethod != '') {
echo '

Default method likely to be used for communications is: ' . $defaultMethod . ', with the fallback method being ' . $altMethod . ' if possible.';
}
echo '

Script finished.';
/************************************/
function doPayPalIPNFsockopenPostback($web, $postback) {
global $info;
$header  = "POST " . $web['path'] . " HTTP/1.1\r\n";
$header .= "Host: " . $web['host'] . "\r\n";
$header .= "Content-type: application/x-www-form-urlencoded\r\n";
$header .= "Content-length: " . strlen($postback) . "\r\n";
$header .= "Connection: close\r\n\r\n";
$errnum = 0;
$errstr = '';
$ssl = $web['protocol'];
//Create paypal connection
$fp=fsockopen($ssl . $web['host'], $web['port'], $errnum, $errstr, 30);
if(!$fp && $ssl == 'ssl://') {
echo nl2br("\n" . 'IPN ERROR :: Could not establish fsockopen: ' . "\n" . 'Host Details = ' . $ssl . $web['host'] . ':' . $web['port'] . ' (' . $errnum . ') ' . $errstr . "\n Trying again with HTTPS over 443 ...");
$ssl = 'https://';
$web['port'] = '443';
$fp=fsockopen($ssl . $web['host'], $web['port'], $errnum, $errstr, 30);
}
if(!$fp && $ssl == 'https://') {
echo nl2br("\n" . 'IPN ERROR :: Could not establish fsockopen: ' . "\n" . 'Host Details = ' . $ssl . $web['host'] . ':' . $web['port'] . ' (' . $errnum . ') ' . $errstr . "\n Trying again directly over 443 ...");
$ssl = '';
$web['port'] = '443';
$fp=fsockopen($ssl . $web['host'], $web['port'], $errnum, $errstr, 30);
}
if(!$fp) {
echo nl2br("\n" . 'IPN ERROR :: Could not establish fsockopen: ' . "\n" . 'Host Details = ' . $ssl . $web['host'] . ':' . $web['port'] . ' (' . $errnum . ') ' . $errstr . "\n Trying again with HTTP over port 80 ...");
$ssl = 'http';
$web['port'] = '80';
$fp=fsockopen($ssl . $web['host'], $web['port'], $errnum, $errstr, 30);
}
if(!$fp) {
echo nl2br("\n" . 'IPN ERROR :: Could not establish fsockopen: ' . "\n" . 'Host Details = ' . $ssl . $web['host'] . ':' . $web['port'] . ' (' . $errnum . ') ' . $errstr . "\n Trying again without any specified protocol, using port 80 ...");
$ssl = '';
$web['port'] = '80';
$fp=fsockopen($ssl . $web['host'], $web['port'], $errnum, $errstr, 30);
}
if(!$fp) {
echo nl2br("\n" . 'IPN FATAL ERROR :: Could not establish fsockopen. ' . "\n" . 'Host Details = ' . $ssl . $web['host'] . ':' . $web['port'] . ' (' . $errnum . ') ' . $errstr . "\n");
die();
}
fputs($fp, $header . $postback . "\r\n\r\n");
$header_data = '';
$headerdone = false;
//loop through the response from the server
while(!feof($fp)) {
$line = @fgets($fp, 1024);
if (strcmp($line, "\r\n") == 0) {
// this is a header row
$headerdone = true;
$header_data .= $line;
} else if ($headerdone) {
// header has been read. now read the contents
$info[] = $line;
}
}
//close fp - we are done with it
fclose($fp);
//break up results into a string
$info = implode("", $info);
$status = (strstr($info,'VERIFIED')) ? 'VERIFIED' : (strstr($info,'SUCCESS')) ? 'SUCCESS' : (strstr($info,'INVALID')) ? 'FSOCKOPEN() RESPONSE RECEIVED - Communications OKAY' : 'FAILED';
echo "\n\n" . '";
return $status;
}
function doPayPalIPNCurlPostback($web, $vars, $verboseMode = FALSE, $headerMode = FALSE) {
$status = 'Attempted connection on: ' .$web['scheme'] . '://' . $web['host'] . $web['path'];
$ch = curl_init($web['scheme'] . '://' . $web['host'] . $web['path']);
$curlOpts = array(CURLOPT_URL => $web['scheme'] . '://' . $web['host'] . $web['path'],
CURLOPT_POST => TRUE,
CURLOPT_POSTFIELDS => $vars,
CURLOPT_TIMEOUT => 45,
CURLOPT_CONNECTTIMEOUT => 30,
CURLOPT_VERBOSE => ($verboseMode ? TRUE : FALSE),
CURLOPT_HEADER => ($headerMode ? TRUE : FALSE),
CURLOPT_FOLLOWLOCATION => FALSE,
CURLOPT_RETURNTRANSFER => TRUE,
CURLOPT_SSL_VERIFYPEER => FALSE,
CURLOPT_SSL_VERIFYHOST => 2,
CURLOPT_FORBID_REUSE => TRUE,
CURLOPT_FRESH_CONNECT => TRUE,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_USERAGENT => 'Zen Cart(tm) - IPN Postback TEST',
);
if ($web['port'] != '80') {
$curlOpts[CURLOPT_PORT] = $web['port'];
}
/*    if (CURL_PROXY_REQUIRED == 'True') {
$proxy_tunnel_flag = (defined('CURL_PROXY_TUNNEL_FLAG') && strtoupper(CURL_PROXY_TUNNEL_FLAG) == 'FALSE') ? false : true;
curl_setopt ($ch, CURLOPT_HTTPPROXYTUNNEL, $proxy_tunnel_flag);
curl_setopt ($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
curl_setopt ($ch, CURLOPT_PROXY, CURL_PROXY_SERVER_DETAILS);
}
*/
curl_setopt_array($ch, $curlOpts);
$response = curl_exec($ch);
$commError = curl_error($ch);
$commErrNo = curl_errno($ch);
$errors = ($commErrNo != 0 ? "\n(" . $commErrNo . ') ' . $commError : '');
if (($response == '' || $errors != '') && ($web['scheme'] != 'http')) {
if ($verboseMode) echo nl2br("\n\n" . 'VERBOSE output:' . "\n-------------\n
" . htmlspecialchars($response, ENT_COMPAT, 'UTF-8', TRUE) . "
\n--------------\n");
echo nl2br('CURL ERROR: ' . $status . $errors . "\n" . 'Trying direct HTTP on port 80 instead ...' . "\n");
$web['scheme'] = 'http';
$web['port'] = '80';
$status = 'Attempted alternate connection on: ' .$web['scheme'] . '://' . $web['host'] . $web['path'] . "\n
";
curl_setopt($ch, CURLOPT_URL, $web['scheme'] . '://' . $web['host'] . $web['path']);
curl_setopt($ch, CURLOPT_PORT, $web['port']);
$response = curl_exec($ch);
$commError = curl_error($ch);
$commErrNo = curl_errno($ch);
}
//$commInfo = @curl_getinfo($ch);
curl_close($ch);
//die("\n\n".'data:'.$response);
if ($verboseMode) echo nl2br("\n\n" . 'VERBOSE output: ' . "\n-------------\n
" . htmlspecialchars($response, ENT_COMPAT, 'UTF-8', TRUE) . "
\n--------------\n");
$errors = ($commErrNo != 0 ? "\n(" . $commErrNo . ') ' . $commError : '');
if ($errors != '') {
echo nl2br('CURL ERROR: ' . $status . $errors . "\n" . 'ABORTING CURL METHOD ...' . "\n\n");
}
$status = (strstr($response,'VERIFIED')) ? 'VERIFIED' : (strstr($response,'SUCCESS')) ? 'SUCCESS' : (strstr($response,'INVALID')) ? 'CURL RESPONSE RECEIVED - Communications OKAY' : 'FAILED';
echo  $status . '
';
return $response;
}