#!/usr/bin/python
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et :
#
# This file is part of Fail2Ban.
#
# Fail2Ban 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 of the License, or
# (at your option) any later version.
#
# Fail2Ban 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 Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# Wrapper to dispatch different commands depending of the IP address
# space present in the command line.
#
# Author: Paul J Aka "Thanat0s"

import sys
import re, subprocess

# Main procedure
def main(cmd4, cmd6, argv):
    pline = " ".join(argv)
    regv4 = re.compile('([0-9]{1,3}\.){3}[0-9]{1,3}')
    if regv4.search(pline):
        # we are facing to an ipv4
        ret = subprocess.call([cmd4] + argv)
        sys.exit(ret)
    else:
        # if not, maybe it's an ipv6
        regv6 = re.compile('::[A-Fa-f0-9]{1,4}|(:[A-Fa-f0-9]{1,4}){2,}')
        if regv6.search(pline):
            ret6 = subprocess.call([cmd6] + argv)
            sys.exit(ret6)
        else:
            # if it's not an ipv6 either, we call both
            proc = subprocess.Popen([cmd4] + argv)
            proc6 = subprocess.Popen([cmd6] + argv)

            # Splitting the Popen and wait() calls lets us run them in
            # parallel, rather than one after the other
            ret = proc.wait()
            ret6 = proc6.wait()

            # return worst error code
            sys.exit(max(ret, ret6))


def dispUsage(exit_code=None):
    print """Usage: %s ipv4_command ipv6_command [options]

Fail2Ban's ipv4/ipv6 dispatcher would call ipv4_command if detects an
IPv4 address among options, and ipv6_command if an IPv6.  If none --
it would call both ipv4_command and ipv6_command.
[options] are passed to each corresponding ipv*_command call.
""" % argv[0]
    if exit_code is not None:
        sys.exit(exit_code)

# Main call, pass all variables
if __name__ == "__main__":
    argv = sys.argv
    if len(argv)>1 and argv[1] in ('-h', '--help'):
        dispUsage(0)
    if len(argv) < 3:
        dispUsage(1)
    main(argv[1], argv[2], argv[3:])