On Tue, 28 Mar 2006 16:01:59 -0600 (CST)
Paul Archer <[EMAIL PROTECTED]> wrote:
> Can anyone suggest modules that can convert IP addresses to and from
> hostnames, and UIDs to and from usernames? I've searched CPAN, but I
> didn't come up with anything.
> Or should I just call 'getent'? (That works for UID<->username, but not for
> IP addresses not in the host file...)
>
Not an easy problem. I've written a lot of anti-spam software, and have beaten
on this problem several times. Here is a snippet of code that does a pretty
good job...
$host = `/usr/bin/host $ip`;
my $foo = (split(/\s+/, $host))[4];
if ($host =~ /not found/ || length($foo)<4) {
$host = `zcw -h $ip | grep Abuse`;
}
if (length $host < 1) {$host = 'UNK';}
if ($host eq 'reached') {$host = 'UNK';}
$host = (split(/\s+/,$host))[-1];
$host = (split(/@/,$host))[-1];
zcw is a nice bit of code I got from www.cyberabuse.org.
Of course, before I even go through these gyrations, I have a simple
database that I keep every IP address I have received e-mail from,
the domain, and a counter, and I check that first.
--
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| Alan K. Jackson | To see a World in a Grain of Sand |
| [EMAIL PROTECTED] | And a Heaven in a Wild Flower, |
| www.ajackson.org | Hold Infinity in the palm of your hand |
| Houston, Texas | And Eternity in an hour. - Blake |
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