Tabish Qureshi
Andrew Gregory's "Message Image" is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.
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| A typical day in a Nobot guestbook log |
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205.234.132.47 - [02/14/06 00:44:06 ] - This is spam! 85.192.4.78 - [02/14/06 01:28:27 ] - This is spam! 211.155.30.122 - [02/14/06 03:39:04 ] - This is spam! 217.9.147.70 - [02/14/06 04:32:38 ] - This is spam! 202.56.253.184 - [02/14/06 04:40:46 ] - This is spam! 195.175.37.8 - [02/14/06 05:01:13 ] - This is spam! 80.58.33.170 - [02/14/06 05:07:42 ] - This is spam! 211.230.27.133 - [02/14/06 05:47:39 ] - This is spam! 203.115.1.134 - [02/14/06 05:50:16 ] - This is spam! 58.78.222.84 - [02/14/06 06:38:00 ] - This is spam! 218.152.150.243 - [02/14/06 09:17:38 ] - This is spam! 217.9.147.70 - [02/14/06 09:20:34 ] - This is spam! 61.111.103.66 - [02/14/06 10:28:51 ] - This is spam! 63.246.146.80 - [02/14/06 11:18:36 ] - This is spam! 165.228.130.12 - [02/14/06 11:32:03 ] - This is spam! 195.175.37.8 - [02/14/06 11:42:21 ] - This is spam! 222.117.44.40 - [02/14/06 12:13:33 ] - This is spam! 211.214.165.115 - [02/14/06 12:53:02 ] - This is spam! 205.234.132.47 - [02/14/06 13:04:37 ] - This is spam! 204.246.129.196 - [02/14/06 13:15:40 ] - ERR: No Comments 196.40.31.138 - [02/14/06 15:06:00 ] - This is spam! 211.172.136.151 - [02/14/06 15:25:45 ] - This is spam! 220.123.68.217 - [02/14/06 15:28:00 ] - This is spam! 165.228.128.11 - [02/14/06 15:32:10 ] - This is spam! 193.194.84.198 - [02/14/06 17:47:24 ] - This is spam! 205.234.132.47 - [02/14/06 17:49:14 ] - This is spam! 202.141.141.10 - [02/14/06 18:26:30 ] Guestbook entry 85.192.4.78 - [02/14/06 18:26:59 ] - This is spam! 67.102.72.146 - [02/14/06 18:29:44 ] - This is spam! 140.198.48.37 - [02/14/06 18:36:18 ] - This is spam! 193.195.76.216 - [02/14/06 18:36:21 ] - This is spam! 62.168.109.160 - [02/14/06 19:15:42 ] - This is spam! 140.198.48.37 - [02/14/06 19:25:55 ] - This is spam! 81.177.10.145 - [02/14/06 19:26:53 ] - This is spam! 81.177.10.145 - [02/14/06 19:26:53 ] - ERR: No Comments 81.177.10.145 - [02/14/06 19:26:53 ] - ERR: No Comments 81.31.160.4 - [02/14/06 19:56:09 ] - This is spam! 70.135.76.65 - [02/14/06 20:09:20 ] - This is spam! 218.149.7.228 - [02/14/06 20:31:56 ] - This is spam! 196.40.31.138 - [02/14/06 20:57:10 ] - This is spam! 196.40.31.138 - [02/14/06 20:57:10 ] - This is spam! 82.175.84.186 - [02/14/06 22:26:16 ] - This is spam! 61.189.240.196 - [02/14/06 22:42:37 ] - This is spam! 196.40.31.138 - [02/14/06 23:57:39 ] - This is spam! |
Nobot Guestbook is a modification of Matt's guestbook to include verification of a human user by asking her to read an image based code number. At present the method seems to be very robust. Those using Matt's guestbook can retain their existing guestbook.html. The best part is, Nobot Guestbook uses nothing other than perl scripts.
How does it work? Stop Guestbook Spam
Working is fairly simple. There is an additional file called code.txt, which contains a 4-5 digit code number. This file resides in the cgi-bin directory, so cannot be read from outside directly.
There is a perl script codeimage.pl which uses the script msgimg.pl, provided by Andrew Gregory, to generate an unclear image of the code number.
The addguest.html from Matt's guestbook has been modified such that it calls codeimage.pl to display an image of the code number. The user is asked to type the code and submit the guestbook form.
The perl guestbook program nobotgbook.pl (which is just a modified form of Matt's guestbook.pl) receives the submitted form data and compares the code number typed by the user with that already in code.txt file. If it doesn't match, the submission is discarded, assuming that it is a spambot (or a user as dumb as that, who can't read a number ;-) .
If nobotgbook.pl successfully updates the guestbook, it generates a new random code number, and writes it to code.txt.
That's all there is to it - enjoy!
Stop Guestbook Spam
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Tabish Qureshi |
This program is free software; you can distribute it and/or
modify it under the terms of the
GNU General Public License
as published by the Free Software Foundation. Andrew Gregory's "Message Image" is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License. |