#!/bin/bash
#
# Init file for dropbear SSH server daemon
#
# chkconfig: - 55 25
# description: dropbear SSH server daemon
#
# processname: dropbear
# config: /etc/dropbear/dropbear_dss_host_key
# config: /etc/dropbear/dropbear_rsa_host_key
# pidfile: /var/run/dropbear.pid

# source function library
. /etc/rc.d/init.d/functions

# pull in sysconfig settings
[ -f /etc/sysconfig/dropbear ] && . /etc/sysconfig/dropbear

RETVAL=0
prog="dropbear"

# Some functions to make the below more readable
KEYGEN=/usr/bin/dropbearkey
DROPBEAR=/usr/sbin/dropbear
RSA_KEY=/etc/dropbear/dropbear_rsa_host_key
DSS_KEY=/etc/dropbear/dropbear_dss_host_key
PID_FILE=/var/run/dropbear.pid

runlevel=$(set -- $(runlevel); eval "echo \$$#" )

do_rsa_keygen() {
	if [ ! -s $RSA_KEY ]; then
		echo -n $"Generating dropbear RSA host key: "
		if $KEYGEN -t rsa -f $RSA_KEY >&/dev/null; then
			chmod 600 $RSA_KEY
			success $"RSA key generation"
			echo
		else
			failure $"RSA key generation"
			echo
			exit 1
		fi
	fi
}

do_dss_keygen() {
	if [ ! -s $DSS_KEY ]; then
		echo -n $"Generating dropbear DSS host key: "
		if $KEYGEN -t dss -f $DSS_KEY >&/dev/null; then
			chmod 600 $DSS_KEY
			success $"DSS key generation"
			echo
		else
			failure $"DSS key generation"
			echo
			exit 1
		fi
	fi
}

start()
{
	# Create keys if necessary
	if [ "x${AUTOCREATE_SERVER_KEYS}" != xNO ]; then
		do_rsa_keygen
		do_dss_keygen
	fi

	echo -n $"Starting $prog: "
	$DROPBEAR $OPTIONS && success || failure
	RETVAL=$?
	[ "$RETVAL" = 0 ] && touch /var/lock/subsys/dropbear
	echo
}

stop()
{
	echo -n $"Stopping $prog: "
	if [ -n "`pidfileofproc $DROPBEAR`" ] ; then
	    killproc $DROPBEAR
	else
	    failure $"Stopping $prog"
	fi
	RETVAL=$?
	# if we are in halt or reboot runlevel kill all running sessions
	# so the TCP connections are closed cleanly
	if [ "x$runlevel" = x0 -o "x$runlevel" = x6 ] ; then
	    killall $prog 2>/dev/null
	fi
	[ "$RETVAL" = 0 ] && rm -f /var/lock/subsys/dropbear
	echo
}

case "$1" in
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		start
		;;
	reload)
		stop
		start
		;;
	condrestart)
		if [ -f /var/lock/subsys/dropbear ] ; then
			stop
			# avoid race
			sleep 3
			start
		fi
		;;
	status)
		status $DROPBEAR
		RETVAL=$?
		;;
	*)
		echo $"Usage: $0 {start|stop|restart|reload|condrestart|status}"
		RETVAL=1
esac
exit $RETVAL