dynamic site in file_get_contents - php

Question

problem , Crossing the CAPTCHA in dynamic site .. :(
problem link action form in https://edu.uast.ac.ir ..
sorry My English is not good.
please test my code :
my source code :
a.php
<?php
echo file_get_contents("https://edu.uast.ac.ir");
?>
b.php
<?php
$a = $_POST["captcha_first_page"];
$postdata = http_build_query(
array(
'captcha_first_page' => $a
)
);
$opts = array('http' =>
array(
'method' => 'POST',
'header' => 'Content-type: application/x-www-form-urlencoded',
'content' => $postdata
)
);
$context = stream_context_create($opts);
$result = file_get_contents('https://edu.uast.ac.ir/user/user_manage/userLogin/', false, $context);
echo $result;
?>
please help me

Answer 1

You have to replace the form action, too, cause if not the submitted form want posted to your b.php.
captcha-a.php
<?php
$content = file_get_contents("https://edu.uast.ac.ir");
$content = str_replace('https://edu.uast.ac.ir/user/user_manage/userLogin/','captcha-b.php', $content);
echo $content;
captcha-b.php
<?php
function redirect_post($url, array $data, array $headers = null) {
$params = array(
'http' => array(
'method' => 'POST',
'content' => http_build_query($data)
)
);
// replace
$headers['Host'] = "edu.uast.ac.ir";
$headers['Origin'] = "https://edu.uast.ac.ir";
$headers['Referer'] = "https://edu.uast.ac.ir";
if (!is_null($headers)) {
$params['http']['header'] = '';
foreach ($headers as $k => $v) {
$params['http']['header'] .= "$k: $v\n";
}
}
$ctx = stream_context_create($params);
$fp = fopen($url, 'rb', false, $ctx);
if ($fp) {
return stream_get_contents($fp);
} else {
// Error
throw new Exception("Error loading '$url', $php_errormsg");
}
}
setlocale(LC_ALL, "en_US.UTF8");
echo redirect_post("https://edu.uast.ac.ir/user/user_manage/userLogin/" ,$_POST, getallheaders());
This should be a good starting point. Don't know if it works cause I can't really speak arabian.