# -*- coding: utf-8 -*-
#
# Copyright (C) 2011-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# 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 of the License, 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, see <http://www.gnu.org/licenses/>.
#

__all__ = [ "FirewallIcmpType" ]

import copy
from firewall.core.logger import log
from firewall import errors
from firewall.errors import FirewallError

class FirewallIcmpType(object):
    def __init__(self, fw):
        self._fw = fw
        self._icmptypes = { }

    def __repr__(self):
        return '%s(%r)' % (self.__class__, self._icmptypes)

    def cleanup(self):
        self._icmptypes.clear()

    # zones

    def get_icmptypes(self):
        return sorted(self._icmptypes.keys())

    def check_icmptype(self, icmptype):
        if icmptype not in self._icmptypes:
            raise FirewallError(errors.INVALID_ICMPTYPE, icmptype)

    def get_icmptype(self, icmptype):
        self.check_icmptype(icmptype)
        return self._icmptypes[icmptype]

    def add_icmptype(self, obj):
        orig_ipvs = obj.destination
        if len(orig_ipvs) == 0:
            orig_ipvs = [ "ipv4", "ipv6" ]
        ipvs = orig_ipvs[:]
        for ipv in orig_ipvs:
            if ipv == "ipv4":
                if not self._fw.ip4tables_enabled and not self._fw.nftables_enabled:
                    continue
                supported_icmps = self._fw.ipv4_supported_icmp_types
            elif ipv == "ipv6":
                if not self._fw.ip6tables_enabled and not self._fw.nftables_enabled:
                    continue
                supported_icmps = self._fw.ipv6_supported_icmp_types
            else:
                supported_icmps = [ ]
            if obj.name.lower() not in supported_icmps:
                log.info1("ICMP type '%s' is not supported by the kernel for %s." % (obj.name, ipv))
                ipvs.remove(ipv)
        if len(ipvs) != len(orig_ipvs):
            if len(ipvs) < 1:
                raise FirewallError(errors.INVALID_ICMPTYPE,
                                    "No supported ICMP type.")
            new_obj = copy.deepcopy(obj)
            new_obj.destination = ipvs
            self._icmptypes[obj.name] = new_obj
        else:
            self._icmptypes[obj.name] = obj

    def remove_icmptype(self, icmptype):
        self.check_icmptype(icmptype)
        del self._icmptypes[icmptype]
