#!/bin/bash
#
# Init file for OpenSSH server daemon
#
# chkconfig: 2345 55 25
# description: OpenSSH server daemon
#
# processname: sshd
# config: /etc/ssh/ssh_host_key
# config: /etc/ssh/ssh_host_key.pub
# config: /etc/ssh/ssh_random_seed
# config: /etc/ssh/sshd_config
# pidfile: /var/run/sshd.pid

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

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

RETVAL=0
prog="sshd"

# Some functions to make the below more readable
KEYGEN=/usr/bin/ssh-keygen
SSHD=/usr/sbin/sshd
RSA1_KEY=/etc/ssh/ssh_host_key
RSA_KEY=/etc/ssh/ssh_host_rsa_key
DSA_KEY=/etc/ssh/ssh_host_dsa_key
PID_FILE=/var/run/sshd.pid

do_rsa1_keygen() {
	if [ ! -s $RSA1_KEY ]; then
		gprintf "Generating SSH1 RSA host key: "
		if $KEYGEN -q -t rsa1 -f $RSA1_KEY -C '' -N '' >&/dev/null; then
			chmod 600 $RSA1_KEY
			chmod 644 $RSA1_KEY.pub
			success "RSA1 key generation"
			echo
		else
			failure "RSA1 key generation"
			echo
			exit 1
		fi
	fi
}

do_rsa_keygen() {
	if [ ! -s $RSA_KEY ]; then
		gprintf "Generating SSH2 RSA host key: "
		if $KEYGEN -q -t rsa -f $RSA_KEY -C '' -N '' >&/dev/null; then
			chmod 600 $RSA_KEY
			chmod 644 $RSA_KEY.pub
			success "RSA key generation"
			echo
		else
			failure "RSA key generation"
			echo
			exit 1
		fi
	fi
}

do_dsa_keygen() {
	if [ ! -s $DSA_KEY ]; then
		gprintf "Generating SSH2 DSA host key: "
		if $KEYGEN -q -t dsa -f $DSA_KEY -C '' -N '' >&/dev/null; then
			chmod 600 $DSA_KEY
			chmod 644 $DSA_KEY.pub
			success "DSA key generation"
			echo
		else
			failure "DSA key generation"
			echo
			exit 1
		fi
	fi
}

do_restart_sanity_check()
{
	$SSHD -t
	RETVAL=$?
	if [ ! "$RETVAL" = 0 ]; then
		failure "Configuration file or keys are invalid"
		echo
	fi
}

start()
{
	# Create keys if necessary
	do_rsa1_keygen
	do_rsa_keygen
	do_dsa_keygen

	gprintf "Starting %s:" "$prog"
	initlog -c "$SSHD $OPTIONS" && success || failure
	RETVAL=$?
	[ "$RETVAL" = 0 ] && touch /var/lock/subsys/sshd
	echo
}

stop()
{
	gprintf "Stopping %s:" "$prog"
	killproc $SSHD -TERM
	RETVAL=$?
	[ "$RETVAL" = 0 ] && rm -f /var/lock/subsys/sshd
	echo
}

reload()
{
	gprintf "Reloading %s:" "$prog"
	killproc $SSHD -HUP
	RETVAL=$?
	echo
}

case "$1" in
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		start
		;;
	reload)
		reload
		;;
	condrestart)
		if [ -f /var/lock/subsys/sshd ] ; then
			do_restart_sanity_check
			if [ "$RETVAL" = 0 ] ; then
				stop
				# avoid race
				sleep 3
				start
			fi
		fi
		;;
	status)
		status $SSHD
		RETVAL=$?
		;;
	*)
		gprintf "Usage: %s {start|stop|restart|reload|condrestart|status}\n" "$0"
		RETVAL=1
esac
exit $RETVAL