#!/bin/sh
# IPsec startup and shutdown command
# Copyright (C) 1998, 1999, 2001  Henry Spencer.
# Copyright (C) 2012 Paul Wouters <paul@libreswan.org>
# Copyright (C) 2013-2019 Tuomo Soini <tis@foobar.fi>
# Copyright (C) 2016 Kim B. Heino <b@bbbs.net>
# Copyright (C) 2019 Paul Wouters <pwouters@redhat.com>
#
# 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 2 of the License, or (at your
# option) any later version.  See <https://www.gnu.org/licenses/gpl2.txt>.
#
# 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.
#
# This is the version for use on Linux.

# Misc. paths (some of this should perhaps be overrideable from ipsec.conf).
rundir=/run/pluto

#pluto searches the current directory, so this is required for making it selinux compliant
cd /

#/etc/resolv.conf related paths
LIBRESWAN_RESOLV_CONF=${rundir}/libreswan-resolv-conf-backup
ORIG_RESOLV_CONF=/etc/resolv.conf


if [ $(ip addr list|grep -c cipsec) -ne 0 ]; then
    echo "Cisco IPsec client is already loaded, aborting! (cipsec# device found)"
    exit 1
fi

initsystem=openrc

# this magic should go. build already decided initsystem.
# it breaks inside a namespace take what was decided at build

if [ "${initsystem}" = "docker" ]; then
    initsystem="docker"
elif [ -d /run/systemd/system ]; then
    initsystem=systemd
elif [ -f /sbin/start ]; then
    if [ -r /etc/redhat-release ]; then
	initsystem=rhsysv
    else
	initsystem=upstart
    fi
elif [ -f /sbin/rc-service ]; then
    initsystem=openrc
elif [ -x /etc/init.d/ipsec ]; then
    initsystem=sysv
fi

case "$1" in
    start|--start|_autostart)
	# preliminaries
	mkdir -p ${rundir}
	chmod 700 ${rundir} > /dev/null 2>/dev/null

	# if namespace testing, start pluto directly
	echo $SUDO_COMMAND | grep "/bin/nsenter " > /dev/null 2>&1
	RETVAL=$?
	if [ $RETVAL -eq 0 ]; then
	    echo "Redirecting to: namespaces direct start via ipsec pluto"
	    exec ipsec pluto --config /etc/ipsec.conf --leak-detective
	fi

	# start regular pluto daemon in a restart loop
	if [ ${initsystem} = systemd ]; then
	    systemctl status ipsec.service > /dev/null
	    RETVAL=$?
	    if [ $RETVAL -eq 0 ]; then
		echo "systemd: ipsec service is already running"
		exit 1
	    else
		echo "Redirecting to: systemctl start ipsec.service"
		exec systemctl start ipsec.service
	    fi
	elif [ ${initsystem} = rhsysv ]; then
	    echo "Redirecting to: service ipsec start"
	    exec service ipsec start
	elif [ ${initsystem} = upstart ]; then
	    echo "Redirecting to: start ipsec"
	    exec start ipsec
	elif [ ${initsystem} = openrc ]; then
	    echo "Redirecting to: rc-service ipsec start"
	    exec rc-service ipsec start
	elif [ ${initsystem} = sysv ]; then
	    echo "Redirecting to: /etc/init.d/ipsec start"
	    exec /etc/init.d/ipsec start
	elif [ ${initsystem} = docker ]; then
	    echo "Redirecting to: /etc/init.d/ipsec start"
	    exec /etc/init.d/ipsec start
	else
	    echo "Unknown init system in use - aborted"
	    exit 3
	fi
	exit 0
	;;
  stop|--stop|_autostop)	# _autostop is same as stop
	# Shut things down.

	# if namespace testing, stop pluto directly
	echo $SUDO_COMMAND | grep "/bin/nsenter " && echo "Redirecting to: [stop manually]"
	echo $SUDO_COMMAND | grep "/bin/nsenter " && ipsec whack --shutdown
	echo $SUDO_COMMAND | grep "/bin/nsenter " && exec ip xfrm state flush


	if [ ${initsystem} = systemd ]; then
	    echo "Redirecting to: systemctl stop ipsec.service"
	    # don't exec, we need to cleanup the IPsec stack afterwards
	    systemctl stop ipsec.service
	elif [ ${initsystem} = rhsysv ]; then
	    echo "Redirecting to: service ipsec stop"
	    exec service ipsec stop
	elif [ ${initsystem} = upstart ]; then
	    echo "Redirecting to: stop ipsec"
	    stop ipsec
	elif [ ${initsystem} = openrc ]; then
	    echo "Redirecting to: rc-service ipsec stop"
	    exec rc-service ipsec stop
	elif [ ${initsystem} = sysv ]; then
	    echo "Redirecting to: /etc/init.d/ipsec stop"
	    exec /etc/init.d/ipsec stop
	elif [ ${initsystem} = docker ]; then
	    echo "Redirecting to: /etc/init.d/ipsec stop"
	    exec /etc/init.d/ipsec stop
	else
	    echo "Unknown init system in use - aborted"
	    exit 3
	fi
       	# Remove any loaded IPsec stack
	[ -f /proc/modules ] && ipsec _stackmanager stop

	# If stack is non-modular, we want to force clean too
	[ -f /proc/net/pf_key ] && ipsec eroute --clear
	[ -f /proc/sys/net/core/xfrm_acq_expires ] && ip xfrm state flush && ip xfrm policy flush

	# Cleaning up backup resolv.conf
	if [ -e ${LIBRESWAN_RESOLV_CONF} ]; then
	    if grep 'Libreswan' ${ORIG_RESOLV_CONF} > /dev/null 2>&1; then
		cp ${LIBRESWAN_RESOLV_CONF} ${ORIG_RESOLV_CONF}
	    fi
	    rm -f  ${LIBRESWAN_RESOLV_CONF}
	fi
	exit 0
	;;
    status|--status)
	if [ ${initsystem} = systemd ]; then
	    echo "Redirecting to: systemctl status ipsec.service"
	    exec systemctl status ipsec.service
	elif [ ${initsystem} = rhsysv ]; then
	    echo "Redirecting to: service ipsec status"
	    exec service ipsec status
	elif [ ${initsystem} = upstart ]; then
	    echo "Redirecting to: status ipsec"
	    exec status ipsec
	elif [ ${initsystem} = openrc ]; then
	    echo "Redirecting to: rc-service ipsec status"
	    exec rc-service ipsec status
	elif [ ${initsystem} = sysv ]; then
	    echo "Redirecting to: /etc/init.d/ipsec status"
	    exec /etc/init.d/ipsec status
	else
	    echo "Unknown init system in use - aborted"
	    exit 3
	fi
	exit 0
	;;
    restart|--restart)
	# assumes preparations for running have already been done,
	# as service should be running now
	if [ ${initsystem} = systemd ]; then
	    echo "Redirecting to: systemctl restart ipsec.service"
	    exec systemctl restart ipsec.service
	elif [ ${initsystem} = rhsysv ]; then
	    echo "Redirecting to: service ipsec restart"
	    exec service ipsec restart
	elif [ ${initsystem} = upstart ]; then
	    echo "Redirecting to: restart ipsec"
	    exec restart ipsec
	elif [ ${initsystem} = openrc ]; then
	    echo "Redirecting to: rc-service ipsec restart"
	    exec rc-service ipsec restart
	elif [ ${initsystem} = sysv ]; then
	    echo "Redirecting to: /etc/init.d/ipsec restart"
	    exec /etc/init.d/ipsec restart
	elif [ ${initsystem} = docker ]; then
	    echo "Redirecting to: /etc/init.d/ipsec restart"
	    exec /etc/init.d/ipsec restart
	else
	    echo "Unknown init system in use - aborted"
	    exit 3
	fi
	exit 0
	;;
    *)
	echo "Usage: {--start|--stop|--restart|--status}" >&2
	exit 2
esac

exit 0
