#!/bin/sh
# Pluto control daemon
# Copyright (C) 1998, 1999, 2001  Henry Spencer.
# Copyright (C) 2010-2013 Tuomo Soini <tis@foobar.fi>
# Copyright (C) 2012 Paul Wouters <paul@libreswan.org>
#
# 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.

PLUTO_OPTIONS=$*
pidfile=/run/pluto/pluto.pid
execdir=${IPSEC_EXECDIR:-/usr/libexec/ipsec}

# create nss if the admin deleted it or the packaging did not create it
ipsec --checknss

# precautions
if [ -f ${pidfile} ]; then
    echo "pluto appears to be running already (\"${pidfile}\" exists), will not start another" | \
	logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
    exit 1
fi

# spin off into the background, with our own logging
echo "Starting Pluto" | logger -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1

# Work around problem with broken shells (e.g. Busybox sh).
# We are called with stdout & stderr going to a logger process started
# by "ipsec setup". For some reason, when the below loop runs with
# stdout & stderr redirected to a new logger, the pipe to the old logger
# is leaked through to _plutorun as file descriptor 11, and the old
# logger (and "ipsec setup") can never exit. By closing fds 1 & 2
# before they can be dup'd to 11, we somehow avoid the problem.
# This problem may also apply to Ubuntu's dash shell
# but the workaround has not been tested there.
exec 1>/dev/null
exec 2>/dev/null

${execdir}/pluto ${PLUTO_OPTIONS}
status=$?
case "$status" in
    10)
	echo "pluto apparently already running (?!?), giving up" | \
	    logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
	exit 0
	;;
    137)
	echo "pluto killed by SIGKILL, terminating without restart or unlock" | \
	    logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
	rm -f ${pidfile}
	exit 0
	;;
    0)
	echo "pluto killed by SIGTERM, terminating without restart" | \
	    logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
	# pluto now does its own unlock for this
	exit 0
	;;
    *)
	st=${status}

	if [ ${st} -gt 128 ]; then
	    st="${st} (signal $((${st} - 128)))"
	fi
	echo "!pluto failure!:  exited with error status ${st}" | \
	    logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
	echo "restarting IPsec after pause..." | \
	    logger -s -p authpriv.error -t ipsec__plutorun >/dev/null 2>&1
	(
	    sleep 10
	    # use start, not restart for now, due to module unloading/loading
	    # clean up old pidfile so new start will be successful
	    rm -f ${pidfile}
	    ipsec setup start
	) </dev/null >/dev/null 2>&1 &
	exit 1
	;;
esac

exit 0
