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#!/sbin/runscript
# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

CONNTRACKD_BIN="/usr/sbin/conntrackd"
CONNTRACKD_CFG=${CONNTRACKD_CFG:-/etc/conntrackd/conntrackd.conf}
CONNTRACKD_LOCK=${CONNTRACKD_LOCK:-/var/lock/conntrack.lock}

depend() {
	use logger
	need net
}

checkconfig() {
	# check for netfilter conntrack kernel support
	local nf_ct_available=0
	for k in net.netfilter.nf_conntrack_max \
		net.ipv4.netfilter.ip_conntrack_max \
		net.nf_conntrack_max; do
		if sysctl -e -n ${k} &>/dev/null; then
			nf_ct_available=1 # sysctl key found
			break
		fi
	done
	if [ ${nf_ct_available} -eq 0 ]; then
		eerror
		eerror "Your kernel is missing netfilter conntrack support!"
		eerror "Make sure your kernel was compiled with netfilter conntrack support."
		eerror
		eerror "If it was compiled as a module you need to ensure the module is being"
		eerror "loaded before starting conntrackd."
		eerror "Either add an entry to /etc/modules.autoload/[...] (for baselayout-1)"
		eerror "or /etc/conf.d/modules (for baselayout-2/OpenRC) or load the module"
		eerror "by hand like this, depending on your kernel version:"
		eerror
		eerror "  modprobe nf_conntrack # (for newer kernels)"
		eerror "  modprobe ip_conntrack # (for older kernels)"
		eerror
		return 1
	fi
	# check if netfilter conntrack TCP window tracking is disabled
	local nf_ct_tcp_be_liberal=0
	for k in net.netfilter.nf_conntrack_tcp_be_liberal \
		net.ipv4.netfilter.ip_conntrack_tcp_be_liberal; do
		nf_ct_tcp_be_liberal=$(sysctl -e -n ${k} 2>/dev/null)
		if [ ${?} -ne 0 ]; then
			continue # sysctl key not found
		else
			break # sysctl key found
		fi
	done
	if [ ${nf_ct_tcp_be_liberal} -ne 1 ]; then
		eerror
		eerror "You need to disable TCP window tracking!"
		eerror "Add the following line to your /etc/sysctl.conf:"
		eerror
		eerror "  ${k} = 1"
		eerror
		eerror "...and run this to activate the setting: sysctl -q -p"
		eerror
		return 1
	fi
	# check for config file
	if [ ! -e "${CONNTRACKD_CFG}" ]; then
		eerror
		eerror "The conntrackd config file (${CONNTRACKD_CFG})"
		eerror "is missing!"
		eerror
		return 1
	fi
	# check for leftover lockfile
	if [ -f "${CONNTRACKD_LOCK}" ]; then
		ewarn
		ewarn "The conntrackd lockfile (${CONNTRACKD_LOCK})"
		ewarn "exists although the service is not marked as started."
		ewarn "Will remove the lockfile and start the service in 10s"
		ewarn "if not interrupted..."
		ewarn
		sleep 10
		if ! rm -f "${CONNTRACKD_LOCK}"; then
			eerror "Failed to remove the conntrackd lockfile (${CONNTRACKD_LOCK})"
			return 1
		fi
	fi
}

start() {
	checkconfig || return 1
	ebegin "Starting conntrackd"
	start-stop-daemon --start --exec "${CONNTRACKD_BIN}" \
		-- -d -C "${CONNTRACKD_CFG}" ${CONNTRACKD_OPTS}
	eend $?
}

stop() {
	ebegin "Stopping conntrackd"
	start-stop-daemon --stop --exec "${CONNTRACKD_BIN}"
	eend $?
}