I'd consider de-coupling this from the apache log handler.

That makes so much sense I rewrote it immediately using File::Tail and Proc::Daemon. By the way this piped version works, but probably won't scale so well as you generously pointed out. Thank you. 

#!/usr/bin/perl -w

use strict;
use Fcntl qw(:DEFAULT);
use File::Tail;
use Net::Netmask;
use Net::Whois::IANA;
use Proc::Daemon;
use SDBM_File;

Proc::Daemon::Init;

my $bye  = join '|', (
 'strings known to occur',
 'in custname and orgname',
);
my $bad = 'some\.bad\.host|other\.worse\d+';

my $file = File::Tail->new("/path/to/ip_log");
my $iana = Net::Whois::IANA->new;

tie (my %seen, 'SDBM_File', '/some/sdbm', O_RDWR|O_CREAT, 0666)
or die "$!";

while (defined (my $ip = $file->read)) {
  chomp $ip;
  next if exists $seen{$ip};
  $seen{$ip} = 1;

  my $problem = 0;
  my $host = `host $ip` or next;
  $problem = 1 if $host =~ /$badhosts/i;

  if ($problem or $host =~ /(not found|timed out)/) {
    $iana->whois_query(-ip=>$ip);

    my $inetnum  = $iana->inetnum || '';
    my $custname = $iana->{QUERY}->{custname} || '';
    my $orgname  = $iana->{QUERY}->{orgname}  || '';

    next unless $inetnum 
    and ($problem or $custname or $orgname);

    if ($custname =~ /($bye)/i or $orgname =~ /($bye)/i){
      my $mask = Net::Netmask->new($inetnum);
      `iptables -A INPUT -s $mask -j DROP`;
    }
  }
}
untie %seen;

[download]

In reply to Re^2: Apache log piped to Perl by Anonymous Monk
in thread Apache log piped to Perl by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.