#!/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-port

HOOK_SETTINGS=(
	"ADDRESS"
	"PARENT_PORT"
	"TAG"
)

PORT_PARENTS_VAR="PARENT_PORT"

hook_check_settings() {
	assert isset PARENT_PORT
	assert isinteger TAG

	if isset ADDRESS; then
		assert ismac ADDRESS
	fi

	if [ ${TAG} -gt 4096 ]; then
		error "TAG is greater than 4096."
		exit ${EXIT_ERROR}
	fi

	local reserved
	for reserved in 0 4095; do
		if [ "${TAG}" = "${reserved}" ]; then
			error "TAG=${reserved} is reserved."
			exit ${EXIT_ERROR}
		fi
	done
}

hook_find_port_name() {
	assert isset PARENT_PORT
	assert isset TAG

	print "${PARENT_PORT}${VLAN_PORT_INTERFIX}${TAG}"
}

hook_parse_cmdline() {
	while [ $# -gt 0 ]; do
		case "${1}" in
			--address=*)
				ADDRESS=$(cli_get_val "${1}")

				# Validate address
				if ! mac_is_valid "${ADDRESS}"; then
					error "Invalid MAC address given: ${ADDRESS}"
					return ${EXIT_CONF_ERROR}
				fi
				;;
			--port=*)
				PARENT_PORT=$(cli_get_val "${1}")

				# Check if PARENT_PORT exists
				if ! port_exists "${PARENT_PORT}"; then
					error "Port '${PARENT_PORT}' does not exist"
					return ${EXIT_CONF_ERROR}
				fi
				;;
			--tag=*)
				TAG=$(cli_get_val "${1}")
				;;
			*)
				error "Unknown argument '${1}'"
				return ${EXIT_CONF_ERROR}
				;;
		esac
		shift
	done

	# Generate a random MAC address if none given
	if ! isset ADDRESS; then
		ADDRESS="$(mac_generate)"
	fi
}

hook_create() {
	local port="${1}"
	assert isset port

	device_exists "${port}" && exit ${EXIT_OK}

	# Read configruation
	if ! port_settings_read "${port}"; then
		return ${EXIT_ERROR}
	fi

	# Check if the parent port exists
	if ! port_exists "${PARENT_PORT}"; then
		error "Port '${PARENT_PORT}' does not exist"
		return ${EXIT_ERROR}
	fi

	# Create the VLAN device
	if ! vlan_create "${port}" \
			--address="${ADDRESS}" \
			--parent="${PARENT_PORT}" \
			--tag="${TAG}"; then
		error "Could not create port: ${port}"
		return ${EXIT_ERROR}
	fi

	return ${EXIT_OK}
}

hook_remove() {
	local port="${1}"
	assert isset port

	if device_exists "${port}"; then
		vlan_remove "${port}"
	fi

	exit ${EXIT_OK}
}