{"id":193,"date":"2005-02-05T15:34:22","date_gmt":"2005-02-05T14:34:22","guid":{"rendered":"http:\/\/frenchfragfactory.net\/ozh\/archives\/2005\/02\/05\/avoid-refer-spam\/"},"modified":"2007-05-09T23:41:02","modified_gmt":"2007-05-09T21:41:02","slug":"no-refer-spam","status":"publish","type":"post","link":"https:\/\/planetozh.com\/blog\/2005\/02\/no-refer-spam\/","title":{"rendered":"No Refer Spam"},"content":{"rendered":"

\"Refer<\/a>I have been hit quite bad by referer spammers these last few days, with peaks at one hit every 2 seconds<\/strong> (bots loading pages of my site with a fake referer in order to make someone click on their site, have a look at this refer spam screenshot<\/a>)<\/p>\n

It's not like I really care<\/em> : I don't display publicly my referers and I'm not dumb enough to click on their links, so they are not earning a single click from my site. Plus, I'm bandwith unmetered and uncapped on a fat 100 Mbits, so their bot loading pages is not a real problem. It's just that I'd rather be slashdotted than refer-spam-hammered :)<\/p>\n

So I wrote a simple anti refer spam script, sending back the spammers to their own site.<\/p>\n

<\/p>\n

Update 2005-02-25<\/strong> : I'm currently improving quite a few things in this script, yet having in mind that I want to keep it as easy as possible. Stay tuned if you're interested, feel free to leave a comment asking for a notice when it's available.<\/p>\n

Update 2005-09-01<\/strong> : this script is deprecated. I've made a much much more efficient, smarter, and that require ultra light if any maintenance. I just have to find time to publish it :)<\/p>\n

Get the script<\/h2>\n

The script is rather simple : an array of obvious spammers site (or keywords, or top domain), and a loop comparing the referer with each entry of the array. If one matches, client gets redirected to its own site. Now if they want to hammer themselves once every 2 seconds, I really don't care :)<\/p>\n

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\n\t\t\t\t\t\t< View plain text<\/span> ><\/a>\n\t\t\t\t\t<\/div>\n\n\t\t
php<\/div>\n\n\t\t\n\t\t
\n\n\t<\/div>\n\t\n\t
\n\t\t
  1. <?php<\/span><\/div><\/li>\n
  2. $spams<\/span> =<\/span> array<\/span> (<\/span><\/div><\/li>\n
  3.   "terashells.com"<\/span>,<\/span> "chat-nett.com"<\/span>,<\/span> "exitq.com"<\/span>,<\/span> "cxa.de"<\/span>,<\/span> "sysrem03.com"<\/span>,<\/span><\/div><\/li>\n
  4.   "pharmacy.info"<\/span>,<\/span> "guide.info"<\/span>,<\/span> "drugstore.info"<\/span>,<\/span><\/div><\/li>\n
  5. )<\/span>;<\/span> \/\/ array of evil spammers<\/span><\/div><\/li>\n
  6.  <\/div><\/li>\n
  7. $ref<\/span> =<\/span> $_SERVER<\/span>&<\/span>#91;"HTTP_REFERER"&#93;;<\/span><\/div><\/li>\n
  8.  <\/div><\/li>\n
  9. foreach<\/span> (<\/span>$spams<\/span> as<\/span> $site<\/span>)<\/span> {<\/span><\/div><\/li>\n
  10.     $pattern<\/span> =<\/span> "\/$site<\/span>\/i"<\/span>;<\/span><\/div><\/li>\n
  11.     if<\/span> (<\/span>preg_match<\/span> (<\/span>$pattern<\/span>,<\/span> $ref<\/span>)<\/span>)<\/span> {<\/span><\/div><\/li>\n
  12.         header<\/span>(<\/span>"Location: $ref<\/span>"<\/span>)<\/span>;<\/span> exit<\/span>(<\/span>)<\/span>;<\/span><\/div><\/li>\n
  13.     }<\/span><\/div><\/li>\n
  14. }<\/span><\/div><\/li>\n
  15. ?><\/span><\/div><\/li>\n<\/ol>\t<\/div>\n\n<\/div>\n\n

    You can either cut and paste the code above, or download the script which contains my real-time updated spammers list (which doesn't grow fast, hopefully) :<\/p>\n