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################################################################################
# _____ _
# |_ _| |_ ___
# | | | ' \/ -_)
# |_| |_||_\___|
# _ _ ____ _ _
# / \ _ __ ___| |_(_) ___ __ _ | _ \ _ __ ___ (_) ___ ___| |_
# / _ \ | '__/ __| __| |/ __/ _` | | |_) | '__/ _ \| |/ _ \/ __| __|
# / ___ \| | | (__| |_| | (_| (_| | | __/| | | (_) | | __/ (__| |_
# /_/ \_\_| \___|\__|_|\___\__,_| |_| |_| \___// |\___|\___|\__|
# |__/
# The Arctica Modular Remote Computing Framework
#
################################################################################
#
# Copyright (C) 2015-2016 The Arctica Project
# http://http://arctica-project.org/
#
# This code is dual licensed: strictly GPL-2 or AGPL-3+
#
# GPL-2
# -----
# 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; version 2 of the License.
#
# 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.,
#
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#
# AGPL-3+
# -------
# This programm is free software; you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This programm 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Copyright (C) 2015-2016 Guangzhou Nianguan Electronics Technology Co.Ltd.
# <opensource@gznianguan.com>
# Copyright (C) 2015-2016 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
#
################################################################################
package Arctica::Core::JABus::Socket::RandomPortTCP;
use strict;
use Exporter qw(import);
use IO::Socket::INET;
# Be very selective about what (if any) gets exported by default:
our @EXPORT = qw( getRandomPortTCP );
# And be mindfull of what we lett the caller request here too:
our @EXPORT_OK = qw( );
sub getRandomPortTCP {
# Dirty little hack that gets you a random availalbe TCP port
# Its advisable to catch bind failure and request a new port
# in the unlikely event bind to port fails.
# Makes prediction based DoS harder and avoids a few other issues...
# Need to load these values from a config file in /etc/arctica/
my $portrange_min = 30000;
my $portrange_max = 50000;
my $attempt_max = 1000;
my $attempt_cnt = 0;
while ($attempt_cnt <= $attempt_max) {
my $random_port = int($portrange_min + rand($portrange_max - $portrange_min));
unless (IO::Socket::INET->new(
PeerAddr => 'localhost',
PeerPort => $random_port,
Proto => 'tcp')) {
return $random_port;
}
$attempt_cnt++;
}
return 0;
}
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