#!/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_SETTINGS=(
	"DNS_SERVERS"
	"MTU"
	"SERVICE_NAME"
	"SUBNET MAX_SESSIONS"
)

DEFAULT_MTU=1492
DEFAULT_MAX_SESSIONS=0

hook_check_config_settings() {
	assert isset MTU
	assert isset SUBNET
	assert isset MAX_SESSIONS

	local server
	for server in ${DNS_SERVERS}; do
		assert ipv4_is_valid "${server}"
	done
}

hook_parse_cmdline() {
	local id="${1}"
	shift

	while [ $# -gt 0 ]; do
		case "${1}" in
			--dns-server=*)
				local dns_servers="$(cli_get_val "${1}")"

				local dns_server
				for dns_server in ${dns_servers}; do
					if ! ipv4_is_valid "${dns_server}"; then
						warning  "Invalid IPv4 address: ${dns_server}. Skipped."
						continue
					fi

					list_append DNS_SERVERS "${dns_server}"
				done
				;;
			--max-sessions=*)
				MAX_SESSIONS=$(cli_get_val "${1}")
				if ! isinteger ${MAX_SESSIONS} || ! [ ${MAX_SESSIONS} -ge 0 ]; then
					error "Invalid value for '--max-session'. This value must be an integer greate or eqal zero."
					exit ${EXIT_ERROR}
				fi
				;;
			--mtu=*)
				MTU=$(cli_get_val "${1}")
				if ! mtu_is_valid "ipv4" ${MTU}; then
					error "Invalid value for '--mtu'. Cannot be larger then 9000 or smaller than 576"
					exit ${EXIT_ERROR}
				fi
				;;
			--service-name=*)
				SERVICE_NAME=$(cli_get_val "${1}")
				;;
			--subnet=*)
				SUBNET=$(cli_get_val "${1}")
				if ! ipv4_net_is_valid "${SUBNET}"; then
					error "Invalid IPv4 Subnet ${SUBNET}."
					exit ${EXIT_ERROR}
				fi
				;;
			*)
				warning "Ignoring unknown option '${1}'"
				;;
		esac
		shift
	done
}

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

	# Start the PPPoE server.
	pppoe_server_start ${zone}

	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 the PPPoE server.
	pppoe_server_stop ${zone}

	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 pppoe_server_status ${zone}; then
		status="${MSG_HOOK_UP}"
	else
		status="${MSG_HOOK_DOWN}"
	fi
	cli_statusline 3 "PPPoE server" "${status}"

	local gateway=$(ipv4_get_network ${SUBNET})
	cli_print_fmt1 3 "Gateway" "${gateway}"

	local start_address=$(ipv4_encode ${gateway})
	start_address=$(( ${start_address} + 1 ))
	start_address=$(ipv4_decode ${start_address})
	local end_address=$(ipv4_get_broadcast ${SUBNET})

	cli_print_fmt1 3 "Client range" \
		"${start_address}-${end_address}"
	cli_space

	local max_sessions=${MAX_SESSIONS}
	if [ "${max_sessions}" = "0" ]; then
		max_sessions="unlimited"
	fi
	cli_print_fmt1 3 "${max_sessions} session(s) per MAC"
	cli_space

	exit ${EXIT_OK}
}