#!/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/>.       #
#                                                                             #
###############################################################################

IP_SUPPORTED_PROTOCOLS="${IP_SUPPORTED_PROTOCOLS} ipv4"

function ipv4_is_valid() {
	ipcalc --ipv4 -c $@ >/dev/null 2>&1

	case "$?" in
		0)
			return ${EXIT_OK}
			;;
		*)
			return ${EXIT_ERROR}
			;;
	esac
}

function ipv4_detect_duplicate() {
	local device=${1}
	local address=${2}

	assert isset address
	assert isset device
	assert device_exists ${device}

	# Don't check on PPP devices.
	device_is_ppp ${device} && return ${EXIT_ERROR}

	if ! arping -q -c 2 -w 3 -D -I ${device} ${address}; then
		log DEBUG "Detected duplicate address '${address}' on device '${device}'."
		return ${EXIT_OK}
	fi

	return ${EXIT_ERROR}
}

function ipv4_update_neighbours() {
	local device=${1}
	local address=${2}

	# Don't do anything on PPP devices.
	device_is_ppp ${device} && return ${EXIT_OK}

	arping -q -A -c 1 -I ${device} ${address}
	( sleep 2; arping -q -U -c 1 -I ${device} ${address} ) >/dev/null 2>&1 </dev/null &
}

function ipv4_get_netaddress() {
	local address=${1}
	assert isset address

	local prefix=$(ip_get_prefix ${address})
	assert isset prefix

	local NETWORK
	eval $(ipcalc --network ${address})
	assert isset NETWORK

	echo "${NETWORK}/${prefix}"

	return ${EXIT_OK}
}

function ipv4_get_prefix() {
	local address=${1}
	local broadcast=${2}

	assert isset address
	assert isset broadcast

	local PREFIX
	eval $(ipcalc --prefix ${address} ${broadcast})
	assert isset PREFIX

	echo "${PREFIX}"
	return ${EXIT_OK}
}

function ipv4_flush_device() {
	#
	# Flushes all routes, addresses from the device
	# and clears the ARP cache.
	#

	local device=${1}
	assert isset device

	ip -4 addr flush dev ${device} >/dev/null 2>&1
	ip -4 route flush dev ${device} >/dev/null 2>&1
	ip -4 neigh flush dev ${device} >/dev/null 2>&1

	return 0

function ipv4_prefix2netmask() {
	local prefix=${1}
	shift

	assert isinteger prefix

	# XXX this function is a stub

	case "${prefix}" in
		24)
			echo "255.255.255.0"
			;;
		*)
			assert false NOT IMPLEMENTED
			;;
	esac
}