#!/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
#
### BEGIN INIT INFO
# Provides: sshd
# Required-Start: $network
# Should-Start: $remote_fs
# Required-Stop: $network
# Should-Stop: $remote_fs
# Default-Start: 2 3 4 5
# Short-Description: OpenSSH server daemon
# Description: OpenSSH server daemon
### END INIT INFO

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

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

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

do_rsa1_keygen() {
	if [ ! -s $RSA1_KEY ]; then
		echo -n $"Generating SSH1 RSA host key: "
		if $KEYGEN -q -t rsa1 -f $RSA1_KEY -C '' -N '' >/dev/null 2>&1; 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
		echo -n $"Generating SSH2 RSA host key: "
		if $KEYGEN -q -t rsa -f $RSA_KEY -C '' -N '' >/dev/null 2>&1; 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
		echo -n $"Generating SSH2 DSA host key: "
		if $KEYGEN -q -t dsa -f $DSA_KEY -C '' -N '' >/dev/null 2>&1; 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

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

stop()
{
	echo -n $"Stopping $prog:"
	if [ -r /var/run/sshd.pid ]; then
	    kill -s TERM `cat /var/run/sshd.pid`
	    RETVAL=$?
	    if [ "$runlevel" = 0 -o "$runlevel" = 6 ]; then
	        # stopping the system, kill active sshd clients
    	        killproc -p "" sshd
    	    fi
	    [ "$RETVAL" = 0 ] && success "stop" || failure "stop"
	else
	    success "already stopped"
	    RETVAL=0
	fi
	[ "$RETVAL" = 0 ] && rm -f /var/lock/subsys/sshd
	echo
}

reload()
{
	echo -n $"Reloading $prog:"
	if [ -r /var/run/sshd.pid ]; then
	    kill -s HUP `cat /var/run/sshd.pid`
	    RETVAL=$?
	    [ "$RETVAL" = 0 ] && success "config reload" || failure "config reload"
	else
	    failure "not running so config reload"
	    RETVAL=1
	fi
	echo
}

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