Simple HTTP DNS blacklist lookup module for Nginx

##Description

This module can be used to protect your server from malicious HTTP bots.
Modules makes DNS queries to uceprotect.net, blocklist.de and projecthoneypot.org(optional).
There is internal cache for already checked IP addresses.

Installation

1. Extract module archive into nginx sources folder like nginx-1.3.5/ngx_http_blacklist_lookup_module

2. Configure Nginx adding this module with:

   ./configure (...) --add-module=./ngx_http_blacklist_lookup_module
   

3. Build Nginx as usual with make, make install

4. Configure the module. server and location context are supported. It's better to apply on location where the application is working, like .php or uwsgi_pass.

   Example:

   location = /test {
      
     blacklist_lookup on;
     blacklist_lookup_honeyPotAccessKey "KeyString"; # optional, get this from your Project Honey Pot account (free to register) at http://www.projecthoneypot.org/httpbl_configure.php
     blacklist_lookup_verbose on;                    # optional
     blacklist_lookup_hits 2;                        # optional, 1 - default, 3 - max, but has sence if all services are on
     blacklist_lookup_blocklist_de on;               # optional, enables checks on blocklist.de
     blacklist_lookup_uceprotect_net on;             # optional, enables checks on uceprotect.net
     blacklist_lookup_projecthoneypot_org on;        # optional, enables checks on projecthoneypot.org
     blacklist_lookup_bounce "en";                   # optional, "en" - default, "ru" or "en" are supported
   }
   

TODO

1. Replace internal resolver with ngx_resolver

ISSUES

1. Performance degradation is highly possible.