This plugin checks if the client is listed in RBLs (Real-time Blackhole Lists).
These are lists of IP addresses misbehaving. There are many RBLs, some are more
aggressive than others. More information at http://en.wikipedia.org/wiki/DNSBL

This filter will result in one DNS request for every blocklist that you have
configured. This might be problematic for sites under heavy load, although this
plugin has been used on high-traffic sites without any problem. One DNS
request takes a few miliseconds to complete, after all.


INSTALLATION

1. Download dnsbl_check-(version).tar.gz. You agree to the license.
2. Go to your application's 'vendor/plugins' directory
3. Untar (un-winzip) the above file: tar xvfz dnsbl_check.tar.gz
4. Restart your application.


VERSION HISTORY

0.1			18 June 2006		Initial release
0.2			10 June 2006		Renamed to dnsbl_check, bugfix
0.3			20 June 2006		Removed sorbs from distribution, was not supposed to be included (too aggressive)
0.4			18 July 2006		Explicit return false added, moved to a per-controller basis (not global anymore)
1.0			16 August 2006		Renamed 0.4 to 1.0. I have been using the plugin very succesfully for months now.
1.1			17 October 2006	Multithreaded version
1.2			23 October 2006	Using the native Ruby resolver library for better multithreaded support
1.2.1			25 October 2006	Accepts a wider range of dns responses
1.2.2			11 December 2006	dnsbls are seemingly under attack, added code to cope with failing service


MORE INFORMATION

http://spacebabies.nl/dnsbl_check/
joost@spacebabies.nl