#!/usr/bin/env perl
#aslookup.pl - Looks up information on a given ASN or IP address

use strict;
use warnings;

use Net::Whois::RIPE;

my $default_as_server = "whois.radb.net";
my %whois_options = (
	"hostname"	=>	$default_as_server,
);

if($#ARGV < 0 || $ARGV[0] eq "") {
	print "Provide an IP or ASN to look up";
	exit;
}
my $target = $ARGV[0];
my $whois = Net::Whois::RIPE->new(%whois_options);
my $witerator = $whois->query($target);
while($witerator->isnt_exhausted) {
	my ($asnum,$asname,$descr,$origin,$route);
	my @whoisdata = split /\n/, $witerator->value();
	foreach (@whoisdata) {
		$asnum = $_ if /^aut-num:/;
		$asname = $_ if /^as-name:/;
		$descr = $_ if /^descr:/;
		$origin = $_ if /^origin:/;
		$route = $_ if /^route:/;
	}
	$descr =~ s/.*:[ ]+//;
	if($target =~ /^AS.*/i) {
		$asnum =~ s/.*:[ ]+//;
		$asname =~ s/.*:[ ]+//;
		print "$target is $descr ($asname)\n";
	} else {
		$origin =~ s/.*:[ ]+//;
		$route =~ s/.*:[ ]+//;
		print "$route advertised by $origin - $descr\n";
	}
}