check_bl

Works like a charm. But there is one bug. If the hostname can't be resolved into an IP address, you get an error on line 141. To fix this, i edited the function blkcheck to look like this: sub blcheck { my ($ip, $bl) = @_; my $lookupip = $ip; if (!defined($lookupip)) { print ("ERROR: hostname could not be resolved.n"); exit $ERRORS{"UNKNOWN"}; } $lookupip =~ s/([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3})/$4.$3.$2.$1.$bl/; if (lookup($lookupip)) { return 1 } else { return 0 } }

I had to edit the check_bl file so it used the plugins folder relevant to Nagios XI. Once I did this is worked beautifully. Great check!