#!@PERL@
# Recreates a .db file compatible with that produced by dns-terror
# from the ASCII output of convert-ip-db.
# Mostly useful for disaster recovery.
# Written by David MacKenzie <djm@djmnet.org>
# Please send comments and bug reports to <fastresolve-bugs@djmnet.org>

##############################################################################
#   Copyright 1999 UUNET, an MCI WorldCom company.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
##############################################################################

use BerkeleyDB;
use Fcntl;

main();
exit(0);

sub main
{
    my($dbfile, $ipaddr, $host, %output, $timecode, $timestamp);

    $dbfile = shift @ARGV || die "Usage: $0 ip2host.db < dns.cache\n";

    tie(%output, "BerkeleyDB::Btree", -Filename => $dbfile,
	-Flags => DB_CREATE|DB_TRUNCATE, -Mode => 0640)
	|| die "$0: Can't create $dbfile: $!\n";

    while (<>) {
	chomp;
	($timecode, $ipaddr, $host) = split(/ /, $_, 3);
	$host = "" if $host eq "*";
	$timestamp = ($timecode - (24 * 60)) * 60;
	$output{$ipaddr} = pack("IA*", $timestamp, $host);
    }

    untie(%output);
}