#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
#                                                                             #
# 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 3 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/>.       #
#                                                                             #
###############################################################################

. /usr/lib/network/header-config

HOOK_CONFIG_SETTINGS="HOOK ENABLE_IPV6 ENABLE_IPV4"

# Default settings.
ENABLE_IPV6="on"
ENABLE_IPV4="on"

hook_check_config_settings() {
	assert isset ENABLE_IPV6
	assert isbool ENABLE_IPV6
	assert isset ENABLE_IPV4
	assert isbool ENABLE_IPV4
}

hook_parse_cmdline() {
	while [ $# -gt 0 ]; do
		case "${1}" in
			--enable-ipv6)
				ENABLE_IPV6="on"
				;;
			--disable-ipv6)
				ENABLE_IPV6="off"
				;;
			--enable-ipv4)
				ENABLE_IPV4="on"
				;;
			--disable-ipv4)
				ENABLE_IPV4="off"
				;;
			*)
				warning "Ignoring unknown option '${1}'"
				;;
		esac
		shift
	done

	# Check if the user disabled ipv6 and ipv4
	if ! enabled ENABLE_IPV6 && ! enabled ENABLE_IPV4; then
		log ERROR "You disabled IPv6 and IPv4. At least one must be enabled"
		return ${EXIT_ERROR}
	fi
}

hook_new() {
	local zone="${1}"
	shift

	if zone_config_hook_is_configured ${zone} "dhcp"; then
		log ERROR "You can configure the dhcp hook only once for a zone"
		return ${EXIT_ERROR}
	fi

	if ! hook_parse_cmdline "$@"; then
		# Return an error if the parsing of the cmd line fails
		return ${EXIT_ERROR}
	fi

	zone_config_settings_write "${zone}" "${HOOK}"

	exit ${EXIT_OK}
}

hook_up() {
	local zone=${1}
	local config=${2}
	shift 2

	if ! device_exists ${zone}; then
		error "Zone '${zone}' doesn't exist."
		exit ${EXIT_ERROR}
	fi

	zone_config_settings_read "${zone}" "${config}"

	# Start dhclient for IPv6 on this zone if enabled.
	if enabled ENABLE_IPV6; then
		dhclient_start ${zone} ipv6
	fi

	# Start dhclient for IPv4 on this zone if enabled.
	if enabled ENABLE_IPV4; then
		dhclient_start ${zone} ipv4
	fi

	exit ${EXIT_OK}
}

hook_down() {
	local zone=${1}
	local config=${2}
	shift 2

	if ! device_exists ${zone}; then
		error "Zone '${zone}' doesn't exist."
		exit ${EXIT_ERROR}
	fi

	# Stop dhclient for IPv6 on this zone.
	dhclient_stop ${zone} ipv6

	# Stop dhclient for IPv4 on this zone.
	dhclient_stop ${zone} ipv4

	exit ${EXIT_OK}
}

hook_status() {
	local zone=${1}
	local config=${2}
	shift 2

	if ! device_exists ${zone}; then
		error "Zone '${zone}' doesn't exist."
		exit ${EXIT_ERROR}
	fi

	zone_config_settings_read "${zone}" "${config}"

	local status
	if dhclient_status ${zone} ipv4 || dhclient_status ${zone} ipv6; then
		status="${MSG_HOOK_UP}"
	else
		status="${MSG_HOOK_DOWN}"
	fi
	cli_statusline 3 "${HOOK}" "${status}"

	cli_space

	local proto
	for proto in "IPv6" "IPv4"; do
		local _proto=${proto,,}

		cli_print_fmt1 3 "${proto}"

		if enabled ENABLE_${proto^^}; then
			cli_print_fmt1 4 "Status" "enabled"

			local address="$(db_get "${zone}/${_proto}/local-ip-address")"
			if isset address; then
				cli_print_fmt1 4 "Address" "${address}"
			fi

			local gateway="$(db_get "${zone}/${_proto}/remote-ip-address")"
			if isset gateway; then
				cli_print_fmt1 4 "Gateway" "${gateway}"
			fi

			local dns_servers="$(db_get "${zone}/${_proto}/domain-name-servers")"
			if isset dns_servers; then
				cli_print_fmt1 4 "DNS Servers" "${dns_servers}"
			fi
		else
			cli_print_fmt1 4 "Status" "disabled"
		fi

		cli_space

	done

	exit ${EXIT_OK}
}