Convert CURL to fosckopen in PHP - php

Question

I am working on setting up credit card processing for a site that is live. PHP wasn't compiled with CURL support and I don't want to take the site down to recompile PHP with that, so I am trying to use a different method than the example code provided.
Example CURL code:
function send($packet, $url) {
$header = array("MIME-Version: 1.0","Content-type: application/x-www-form-urlencoded","Contenttransfer-encoding: text");
$ch = curl_init();
// set URL and other appropriate options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt ($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
// Uncomment for host with proxy server
// curl_setopt ($ch, CURLOPT_PROXY, "http://proxyaddress:port");
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $packet);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt ($ch, CURLOPT_TIMEOUT, 10);
// send packet and receive response
$response = curl_exec($ch);
curl_close($ch);
return($response);
}
My attempt to use a different method:
function send($packet, $host, $path) {
$content = '';
$flag = false;
$post_query = urlencode($packet) . "\r\n";
$fp = fsockopen($host, '80');
if ($fp) {
fputs($fp, "POST $path HTTP/1.0\r\n");
fputs($fp, "Host: $host\r\n");
fputs($fp, "Content-length: ". strlen($post_query) ."\r\n\r\n");
fputs($fp, $post_query);
while (!feof($fp)) {
$line = fgets($fp, 10240);
if ($flag) {
$content .= $line;
} else {
$headers .= $line;
if (strlen(trim($line)) == 0) {
$flag = true;
}
}
}
fclose($fp);
}
return $content;
}
While this does actually give me a return from the URL I am calling, it does so incorrectly because I get an error back saying it was formatted incorrectly. I am not very familiar with either CURL or this other method, so I am not sure what I am doing wrong.

Answer 1

I tried a modified version of your solution - once everything seemed to be working, I found the multiple fputs() resulted in an intermittent HTTP 505 error coming back from the target server.
To fix this, I had to pre-construct the full request and just do one fputs call like this
$post_vars = "";
$post_vars .= "&somekey=somevalue";
$header = "";
$header .= "POST /my.php HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Host: www.myhost.com \r\n";
$header .= "Content-Length: " . strlen($post_vars) . "\r\n\r\n";
$fp = "";
#$fp = fsockopen ('ssl://www.myhost.com', 443, $errno, $errstr,30);
fputs($fp, $header . $post_vars);
while(!feof($fp)) {
// Read the data returned
$response .= #fgets($fp, 4096);
}
fclose ($fp);

Answer 2

Though you specifically asked for fsockopen() you might also want to try the stream api and context options
function send($packet, $url) {
$ctx = stream_context_create(
array(
'http'=>array(
'header'=>"Content-type: application/x-www-form-urlencoded",
'method'=>'POST',
'content'=>$packet
)
)
);
return file_get_contents($url, 0, $ctx);
}
if you need more error handling use fopen() and stream_get_meta_data() instead of file_get_contents()