Added RPM spec file to blacklist checks

check_bl/releases/0.0.1/README

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+Nagios check_bl plugin (C)Copyright 2005 Bashton Ltd
+----------------------------------------------------
+
+A Nagios plugin to check whether a server is in any known anti-spam
+blocklists.  Licensed under the GNU GPL v2.0 or later (at your option).  For
+full copyright and warranty details, please see the COPYING file included in
+this package.
+
+By Sam Bashton, Bashton Ltd - sam@bashton.com www.bashton.com
+
+Comments, bug reports etc are welcome.
+
+Pre-Requisites
+--------------
+
+- Working Nagios install
+- Perl 5 (tested with Perl 5.6.1 and 5.8)
+- Net::DNS Perl library and associated dependencies
+
+Installation
+------------
+
+- Copy to your nagios plugins directory (possibly /usr/lib/nagios/plugins)
+- Add the following to your checkcommands.cfg:
+
+define command{
+        command_name    check_bl
+        command_line    $USER1$/check_bl -H $HOSTADDRESS$ -B sbl-xbl.spamhaus.or
+g,bl.spamcop.net,t1.dnsbl.net.au
+}
+
+- Alter your services.cfg to include a check against the check_bl command
+
+Variables
+---------
+
+check_bl requires the following variables:
+
+-H host : Hostname to check
+-B blacklist1,blacklist2 : Comma separated list of blacklists to check against
+
+The following optional variable is also available:
+
+-c critnum : Number of blacklists the server must be listed in before the status is 'critical'.  By default, any listing is regarded as critical.