Re: [pm-h] converting IP<->hostname and UID<->username

Interesting stuff there. But if I'm going to call an external program, I 
think I'll stick to getent. It's better than host, dig, etc, for IP/hostname 
lookups 'cause it uses the kernel resolver which pays attention to 
/etc/nsswitch.conf (which means you can get lookups out of local files, nis, 
nis+, dns, or ldap, depending on your machine's configuration).

Thanks,

Paul

7:15pm, Alan Jackson wrote:

> On Tue, 28 Mar 2006 16:01:59 -0600 (CST)
> Paul Archer <tigger@xxxxxx> 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.
>
>
> -- 
> -----------------------------------------------------------------------
> | Alan K. Jackson            | To see a World in a Grain of Sand      |
> | alan@xxxxxxxxxxxx          | 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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