Get captcha using Curl and send data and grab results

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So bascially am new to php. I want to get catpcha from a website. Then I wanna show it on my webpage and send a small post request and get the results. The site I am talking

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执念已碎

2020-12-28 11:41

This was my question on SO for which i didn't get answer.However, i have the answer now.This is the perfect example that you want. I retrieved the captcha using the captcha-url in the source code of the webpage which your site also contains. Extract that image from captcha-url using between(). Then maintain the session and send the request again.The imp. part is that you have to submit the data to the URL of the form, not the page.

<?php

    $cookie="cookie.txt";

    function open($url)
    {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL,$url);  
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2');
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_COOKIE, 1);
        curl_setopt($ch, CURLOPT_COOKIEJAR,$cookie);
        curl_setopt($ch, CURLOPT_COOKIEFILE,$cookie);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); 
        curl_setopt ($ch, CURLOPT_REFERER, $url);
        $result = curl_exec($ch);  
        curl_close($ch);

        return $result;
    }

    function between($string, $start, $end)
    {
        $out = explode($start, $string);

        if(isset($out[1]))
        {
            $string = explode($end, $out[1]);
            echo $string[0];
            return $string[0];
        }

        return '';
    }

    function get_captcha()
    {
        $url    = 'https://academics.vit.ac.in/student/stud_login.asp';
        $open   = open($url);
        $code   = between($open, '<img src='https://academics.vit.ac.in/student/captcha.asp', '">');
        return 'https://academics.vit.ac.in/student/captcha.asp' . $code;

    }

    function rahul()
    {
        $capth=htmlspecialchars($_POST['code']);

        echo $capth;

        $username="xyz"; 
        $password="abc"; 
        $url=url of the form in which you want to submit your data; 
        $cookie="cookie.txt";
        $veri=$capth;

        $com="Login";

        $postdata = "regno=".$username."&passwd=".$password."&vrfcd=".$veri."&submit=".$com;

        $ch = curl_init(); 
        curl_setopt ($ch, CURLOPT_URL, $url); 
        curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
        curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6"); 
        curl_setopt ($ch, CURLOPT_TIMEOUT, 60); 
        curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1); 
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); 
        curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookie); 
        curl_setopt ($ch, CURLOPT_COOKIEFILE, $cookie);  // <-- add this line
        curl_setopt ($ch, CURLOPT_REFERER, $url); 

        curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata); 
        curl_setopt ($ch, CURLOPT_POST, 1); 
        $result = curl_exec ($ch); 

        echo $result;  

        $data = curl_exec($ch);
    }
?>

<html>
    <body>
        <form action="" method="post">
            <img src="<?php echo get_captcha(); ?>" border="0" /><br />
            <input type="text" name="code" value="<?= isset($_POST['code']) ? htmlspecialchars($_POST['code']) : '' ?>" /><br />
            <input type="submit" name="submit" value="submit"/>
        </form>

        <?php
            if(isset($_POST['submit'])) {
                rahul();
            }
        ?>
    </body>
</html>

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