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

use Net::IRR;

my $default_as_server = "whois.radb.net";
my $as_server = $default_as_server;
our $db = Net::IRR->connect(host=>$as_server) or die "Error: Cannot connect to whois server $as_server:43";

sub do_as_lookup {
	my $asn = shift;
	if($asn =~ / /) {
		my @asns = split / /, $asn;
		my $ret = "";
		foreach(@asns) {
			$ret .= do_as_lookup("$_").", ";
		}
		$ret =~ s/, $//g;
		return $ret;
	}
	my @results = $db->match("aut-num",$asn) or return "$asn - unknown AS";
	@results = split /\n/,$results[0];
	my $asname = "";
	my $asdesc = "";
	foreach(@results) {
		$asname = $1 if /as-name:\s+(.+)$/;
		$asdesc .= ", " if length $asdesc > 0 and /^descr/;
		$asdesc .= $1 if /descr:\s+(.+)$/;
	}
	return "$asn $asname - $asdesc";
}
sub do_subnet_lookup {
	my $sub = shift;
	my $result;
	$result = $db->route_search($sub,Net::IRR::ONE_LEVEL) or die "Error: Couldn't seem to get a result for $sub.";
	my @res = split /\n/, $result;
	$result = "";
	my $descr = "";
	my $route = "";
	foreach(@res) {
		$route = $1 if /route6?:\s+(.+)$/;
		$result .= $1." " if /origin:\s+(AS[0-9]+)$/;
		$descr .= $1." : " if /descr:\s+(.+)$/;
	}
	$result =~ s/ +$//g;
	$descr =~ s/ : $//g;
	$sub = $route unless $db->route_search($sub,Net::IRR::EXACT_MATCH);
	return "$sub€$result€$descr";
}

my $target = uc shift || die "Please provide an ASnum or IP/subnet to look up\n";
if($target =~ /^AS/) {
	print "$target is ".do_as_lookup $target;print "\n";
	exit
}
my ($s,$a,$d) = split /€/, do_subnet_lookup $target;
print "$s, $d";
print " (contains $target)" unless $target eq $s;
print " is announced by ".do_as_lookup $a;
print "\n";
$db->disconnect;