#!/usr/bin/perl -w

require 5.002;
use strict;
use SNMP_Session "0.59";
use BER;
use Socket;

sub usage ();

my $bgpPeerState = [1,3,6,1,2,1,15,3,1,2];
my $bgpPeerRemoteAs = [1,3,6,1,2,1,15,3,1,9];

my $hostname = $ARGV[0] || usage ();
my $community = $ARGV[1] || "public";

my $session;

die "Couldn't open SNMP session to $hostname"
    unless ($session = SNMP_Session->open ($hostname, $community, 161));
$session->map_table ([$bgpPeerState, $bgpPeerRemoteAs],
		     sub () {
			 my ($index, $state, $as) = @_;
			 grep (defined $_ && ($_=pretty_print $_),
			       ($state, $as));
			 my $pretty_state = (qw(? idle connect active
						opensent openconfirm
						established))[$state];
			 printf "%-15s %-12s %32s AS%-5s\n",
				 $index, $pretty_state,
				 hostname ($index), $as;
		     });
$session->close ();

1;

sub pretty_addr ($ ) {
    my ($addr) = @_;
    my ($hostname,$aliases,$addrtype,$length,@addrs)
	= gethostbyaddr (inet_aton ($addr), AF_INET);
    $hostname ? $hostname." [".$addr."]" : $addr;
}

sub hostname ($ ) {
    my ($addr) = @_;
    my ($hostname,$aliases,$addrtype,$length,@addrs)
	= gethostbyaddr (inet_aton ($addr), AF_INET);
    $hostname || "[".$addr."]";
}

sub usage () {
  die "usage: $0 host [community]";
}
