#!/bin/bash
#
# Init file for PlanetLab OpenSSH server daemon (copied from standard
# sshd init file, minor modifications made).
#
# chkconfig: 2345 55 25
# description: PlanetLab 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/pl_sshd.pid

# source function library
. /etc/rc.d/init.d/functions
#
# pull in sysconfig settings
[ -f /etc/sysconfig/pl_sshd ] && . /etc/sysconfig/pl_sshd

# add the PlanetLab-specific options
KEYDIR=/var/pl_sshd/keys
OPTIONS="-p 806 -o 'AuthorizedKeysFile $KEYDIR/%u/authorized_keys'"
AUTOMOUNT=/usr/sbin/automount
AUTOMAP=/etc/auto.pl_sshd
AUTOPID=

RETVAL=0
prog="pl_sshd"

# Some functions to make the below more readable
SSHD=/usr/sbin/sshd
RSA1_KEY=/var/local/etc/ssh_host_key
RSA_KEY=/var/local/etc/ssh_host_rsa_key
DSA_KEY=/var/local/etc/ssh_host_dsa_key
PID_FILE=/var/run/pl_sshd.pid

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

check_automount()
{
    # get pid for our automount process
    AUTOPID=`mount | \
	sed -ne "s%^automount(pid\([0-9]*\)) on $KEYDIR type autofs.*%\1%p"`

    # check if that process is still alive
    { [ -n "$AUTOPID" ] && ps -p $AUTOPID >/dev/null 2>&1; } || return 1

    # check if we can actually mount a user dir in the automount dir
    [ -d "$KEYDIR/root" ] || return 1
}

start()
{
        # make sure the key dir exists and automount is working on it
        [ -d "$KEYDIR" ] || mkdir -p $KEYDIR
	[ -x "$AUTOMAP" ] ||
	{ echo "$AUTOMAP not executable"; return 1; }
	check_automount || $AUTOMOUNT $KEYDIR program $AUTOMAP

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

stop()
{
        check_automount && kill -USR2 $AUTOPID

	#echo -n $"Stopping $prog:"
	#killproc $SSHD -TERM
	echo 'you need to kill the port 806 sshd(s) manually'
	echo 'make sure not to kill the port 22 sshd...'
	RETVAL=$?
	[ "$RETVAL" = 0 ] && rm -f /var/lock/subsys/pl_sshd
	#echo
}

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

case "$1" in
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		start
		;;
	reload)
		reload
		;;
	condrestart)
		if [ -f /var/lock/subsys/pl_sshd ] ; then
			do_restart_sanity_check
			if [ "$RETVAL" = 0 ] ; then
				stop
				# avoid race
				sleep 3
				start
			fi
		fi
		;;
	status)
	        check_automount && echo automount running ||
		    echo automount not functioning
		status pl_sshd
		RETVAL=$?
		;;
	*)
		echo $"Usage: $0 {start|stop|restart|reload|condrestart|status}"
		RETVAL=1
esac
exit $RETVAL