#!/bin/bash

#

# sshd		Start up the OpenSSH server daemon

#

# chkconfig: 2345 55 25

# description: SSH is a protocol for secure remote shell access. \

#              This service starts up the 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: $local_fs $network $syslog

# Required-Stop: $local_fs $syslog

# Should-Start: $syslog

# Should-Stop: $network $syslog

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: Start up the OpenSSH server daemon

# Description:       SSH is a protocol for secure remote shell access.

#		     This service starts up the OpenSSH server daemon.

### END INIT INFO

# source function library

. /etc/rc.d/init.d/functions

# pull in sysconfig settings

[ -f /etc/sysconfig/sshd ] && . /etc/sysconfig/sshd

RETVAL=0

prog="sshd"

lockfile=/var/lock/subsys/$prog

# 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

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

do_rsa1_keygen() {

	if [ ! -s $RSA1_KEY ]; then

		echo -n $"Generating SSH1 RSA host key: "

		rm -f $RSA1_KEY

		if test ! -f $RSA1_KEY && $KEYGEN -q -t rsa1 -f $RSA1_KEY -C '' -N '' >&/dev/null; then

			chmod 600 $RSA1_KEY

			chmod 644 $RSA1_KEY.pub

			if [ -x /sbin/restorecon ]; then

			    /sbin/restorecon $RSA1_KEY.pub

			fi

			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: "

		rm -f $RSA_KEY

		if test ! -f $RSA_KEY && $KEYGEN -q -t rsa -f $RSA_KEY -C '' -N '' >&/dev/null; then

			chmod 600 $RSA_KEY

			chmod 644 $RSA_KEY.pub

			if [ -x /sbin/restorecon ]; then

			    /sbin/restorecon $RSA_KEY.pub

			fi

			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: "

		rm -f $DSA_KEY

		if test ! -f $DSA_KEY && $KEYGEN -q -t dsa -f $DSA_KEY -C '' -N '' >&/dev/null; then

			chmod 600 $DSA_KEY

			chmod 644 $DSA_KEY.pub

			if [ -x /sbin/restorecon ]; then

			    /sbin/restorecon $DSA_KEY.pub

			fi

			success $"DSA key generation"

			echo

		else

			failure $"DSA key generation"

			echo

			exit 1

		fi

	fi

}

do_restart_sanity_check()

{

	$SSHD -t

	RETVAL=$?

	if [ $RETVAL -ne  0 ]; then

		failure $"Configuration file or keys are invalid"

		echo

	fi

}

start()

{

	[ -x $SSHD ] || exit 5

	[ -f /etc/ssh/sshd_config ] || exit 6

	# Create keys if necessary

	if [ "x${AUTOCREATE_SERVER_KEYS}" != xNO ]; then

		do_rsa_keygen

		if [ "x${AUTOCREATE_SERVER_KEYS}" != xRSAONLY ]; then

			do_rsa1_keygen

			do_dsa_keygen

		fi

	fi

	echo -n $"Starting $prog: "

	$SSHD $OPTIONS && success || failure

	RETVAL=$?

	[ $RETVAL -eq 0 ] && touch $lockfile

	echo

	return $RETVAL

}

stop()

{

	echo -n $"Stopping $prog: "

	if [ -n "`pidfileofproc $SSHD`" ] ; then

	    killproc $SSHD

	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

	    trap '' TERM

	    killall $prog 2>/dev/null

	    trap TERM

	fi

	[ $RETVAL -eq 0 ] && rm -f $lockfile

	echo

}

reload()

{

	echo -n $"Reloading $prog: "

	if [ -n "`pidfileofproc $SSHD`" ] ; then

	    killproc $SSHD -HUP

	else

	    failure $"Reloading $prog"

	fi

	RETVAL=$?

	echo

}

restart() {

	stop

	start

}

force_reload() {

	restart

}

rh_status() {

	status -p $PID_FILE openssh-daemon

}

rh_status_q() {

	rh_status >/dev/null 2>&1

}

case "$1" in

	start)

		rh_status_q && exit 0

		start

		;;

	stop)

		if ! rh_status_q; then

			rm -f $lockfile

			exit 0

		fi

		stop

		;;

	restart)

		restart

		;;

	reload)

		rh_status_q || exit 7

		reload

		;;

	force-reload)

		force_reload

		;;

	condrestart|try-restart)

		rh_status_q || exit 0

		if [ -f $lockfile ] ; then

			do_restart_sanity_check

			if [ $RETVAL -eq 0 ] ; then

				stop

				# avoid race

				sleep 3

				start

			else

				RETVAL=6

			fi

		fi

		;;

	status)

		rh_status

		RETVAL=$?

		if [ $RETVAL -eq 3 -a -f $lockfile ] ; then

			RETVAL=2

		fi

		;;

	*)

		echo $"Usage: $0 {start|stop|restart|reload|force-reload|condrestart|try-restart|status}"

		RETVAL=2

esac

exit $RETVAL