Check Referrer To Prevent Linking Yours From Other Sites - Check referrer with Php and Mysql
P0T33n
Aug 19 2006, 04:56 PM
Check Referrer Using Php To Prevent People Linking To Your Downloads From Other Sites
Ever find that found some people are listing items, images and tuts and linking directly to the download url (those that are like my photoshop tutorial.php?id=0), which is a .php to count the number of downloads. To prevent this, you can add a piece of code to the download pages that checks which page referred them to the download page: if it's my domain, it downloads the file normally, if it's not, it will redirect to my home page instead.
Important: Not all browsers log referrers, so this won't work depending on the browser the visitor uses and this method can be also bypassed, but it will work for for the major part of visitors.
CODE
<?php $yoursite = "yoursite.com"; //Your site url without http:// $yoursite2 = "www.yoursite.com"; //Type your domain with www. this time
$referer = $_SERVER['HTTP_REFERER'];
//Check if browser sends referrer url or not if ($referer == "") { //If not, set referrer as your domain $domain = $yoursite; } else { $domain = parse_url($referer); //If yes, parse referrer }
//The referrer is not your site, we redirect to your home page header("Location: http://yoursite.com"); exit(); //Stop running the script
}
?>
Hope some one finds this usefull!!
Notice from electriic ink:
P0T33n, in the future please ensure that your topic titles and descriptions are as descriptive as possible and that you put all your code in [-CODE-] tags. Thank you.
That is pretty useful I might have to try it sometime. Hopefully I can adjust it to work on all browsers and make it more secure. I would post a comment on the page saying that those who have reached the page from the wrong area can visit the site that way people know the link they got wasn't from the creator of the download or whatever. I can use this for my download system. Nice tutorial.
This is a nice and usefull script, thanks for sharing it. Leeching is a pretty big problem nowadays seeing every website 'hotlinks like hell' while traffic is very important seeing content can be found everywhere nowadays.
Well, this is useful script for web statistics but not for the prevention of unwanted download. So you should check it it may be as starting point for some other more secure scripts.
But as this script is very easily defeated it is not very secure. So be careful when imposing this script to your site. And another thing I personally never use open source scripts that are widely available for important security parts of my sites.
***--this is after edition--***
there is also one thing is referral is entered as blank that is as you can make custom user agents then you may be able to enter the site and make it work in unwanted way. This is important fact.
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Ever find that found some people are listing items, images and tuts and linking directly to the
download url (those that are like image.php?id=0). To prevent this, you can add a piece of code to
the download pages that checks which page referred them to the download page: if it's your
domain, it downloads the file normally, if it's not, it will redirect to your home page instead.
Important: Not all browsers log referrers, so this won't work depending on the browser the
visitor uses and this method can be also bypassed, but it will work for for the major part....
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