In a Terminal window, enter this command, and then press Enter:
ping samsclass.info
Make sure you are getting replies. If you are not, you need to correct your networking problems before proceeding.
#> prompt, enter these commands
followed by the Enter key:
/etc/init.d/apache2 restart
netstat -an | more
cd /var/www
nano test.php
<?php phpinfo(); ?>
Your screen should look like this:
Press Ctrl+X, then
press Y, then press the Enter key.
This saves your file.
From the menu bar in the top left of the BackTrack desktop, click Applications, Internet, Firefox Web Browser.
In the Firefox address bar, enter localhost/test.php
and then press the Enter key. You should see a PHP configuration page,
as shown below:
This verifies that Apache and PHP are running correctly.
http://www.google.com/recaptcha/whyrecaptcha
Click the "Sign up now!" button.
A Google login page appears. Log in with a Gmail account.
In the next page, enter a domain of "YOURNAME.example.com", and check the "Enable this key on all domains (global key)" box, as shown below:
Click the "Create Key" button.
The next page shows your Public Key and Private Key, as shown below (I have truncated the keys in my example). Copy them to a Notepad file and save it--if you forget these keys you won't be able to complete the project.
nano /var/www/YOURNAME-form.html
Replace the text "YOURNAME" with your own name, but don't use any spaces.
Enter this HTML code into the form, replacing YOURNAME with your name in two places, and replacing KEY with your Public Key in two places:
<html>
<head><title>YOURNAME reCAPTCHA Form</title></head>
<body>
<h1>YOURNAME reCAPTCHA Form</h1>
<form method="post" action="captcha.php">
<script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k=KEY">
</script>
<noscript>
<iframe src="http://www.google.com/recaptcha/api/noscript?k=KEY" height="300" width="500" frameborder="0"></iframe><br>
<textarea name="recaptcha_challenge_field" rows="3" cols="40">
</textarea>
<input type="hidden" name="recaptcha_response_field"
value="manual_challenge">
</noscript>
<input type="submit" />
</form>
</body>
</html>
Save the file with Ctrl+X, Y, Enter.
On your Linux Web aerver, in a Terminal window, enter these commands, pressing Enter after each one:
cd /var/www
wget http://recaptcha.googlecode.com/files/recaptcha-php-1.11.zip
apt-get install unzip
unzip recaptcha-php-1.11.zip
mv recaptcha-php-1.11/recaptchalib.php .
chmod a+rx recaptchalib.php
nano /var/www/captcha.php
Enter this PHP code into the file, replacing KEY with your Private Key, and YOURNAME with your own name:
<?php
require_once('/var/www/recaptchalib.php');
$privatekey = "KEY";
$resp = recaptcha_check_answer ($privatekey, $_SERVER["REMOTE_ADDR"],
$_POST["recaptcha_challenge_field"], $_POST["recaptcha_response_field"]);
if (!$resp->is_valid) {
// What happens when the CAPTCHA was entered incorrectly
die ("The reCAPTCHA wasn't entered correctly. Go back and try it again." . "(reCAPTCHA said: " . $resp->error . ")");
} else {
// Your code here to handle a successful verification
echo "<h1>YOURNAME reCAPTCHA Succeeded!</h1>";
}
?>
Save the file with Ctrl+X, Y, Enter.
On your Linux Web server, in a Terminal window, enter this command, and then press Enter:
chmod a+rx captcha.php
From the menu bar in the top left of the BackTrack desktop, click Applications, Internet, Firefox Web Browser.
In the Firefox address bar, enter localhost/YOURNAME-form.html
and then press the Enter key. You should see a reCAPTCHA form,
as shown below:
Save a screen capture with a filename of "Proj 19a from YOUR NAME".
Fill in the CAPTCHA text and press Enter.
You should see the message "YOURNAME reCAPTCHA Succeeded!", as shown below.
Save a screen capture with a filename of "Proj 19b from YOUR NAME".
Email the images to [email protected] with a subject of "Project 19 from YOUR NAME".
Last modified: 11-30-11 3 pm