#!/bin/sh

export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/mod/sbin:/mod/bin:/mod/usr/sbin:/mod/usr/bin
export LD_LIBRARY_PATH=/mod/lib

DAEMON=dropbear

case "$1" in
	""|load|start|restart)
		if [ ! -r "/mod/etc/conf/$DAEMON-sshd.cfg" ]; then
			echo "Error[$DAEMON]: not configured" 1>&2
			exit 1
		fi

		. /mod/etc/conf/$DAEMON-sshd.cfg
		;;
esac

start() {
	if [ ! -e "/tmp/flash/rsa_host_key" -o ! -e "/tmp/flash/dss_host_key" ]; then
		echo "Creating RSA and DSS host keys"
		rm -f /tmp/flash/rsa_host_key
		rm -f /tmp/flash/dss_host_key
		dropbearkey -t rsa -f /tmp/flash/rsa_host_key
		dropbearkey -t dss -f /tmp/flash/dss_host_key
		/usr/bin/modsave flash
	fi

	if [ ! -d "/mod/etc/ssh" ]; then
		mkdir -p /mod/etc/ssh
		ln -s /tmp/flash/rsa_host_key /mod/etc/ssh/rsa_host_key
		ln -s /tmp/flash/dss_host_key /mod/etc/ssh/dss_host_key
	fi

	[ -e "/mod/root/.ssh" ] || ln -s /tmp/flash/.ssh /mod/root/.ssh

	if [ "$DROPBEAR_SSHD_PWDAUTH" = "yes" ]; then
		if cat /var/tmp/shadow | grep '^root:\*:' > /dev/null; then
			echo "Error[$DAEMON]: no root password set - run 'modpasswd root'" 1>&2
			exit 1
		fi
	else
		DROPBEAR_SSHD_OPTIONS="-s $DROPBEAR_SSHD_OPTIONS"
	fi

	echo -n 'Starting ssh server...'
	set -o noglob
	$DAEMON -p "$DROPBEAR_SSHD_PORT" $DROPBEAR_SSHD_OPTIONS
	exitval=$?
	if [ "$exitval" -eq 0 ]; then
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

stop() {
	echo -n 'Stopping ssh server...'
	killall $DAEMON > /dev/null 2>&1
	exitval=$?
	if [ "$exitval" -eq 0 ]; then
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

case "$1" in
	""|load)
		[ -d "/tmp/flash/.ssh" ] || mkdir /tmp/flash/.ssh

		modreg cgi 'dropbear-sshd' 'Dropbear'

		deffile='/mod/etc/default.dropbear-sshd/authorized_keys.def'
		[ -r "/tmp/flash/authorized_keys.def" ] && deffile='/tmp/flash/authorized_keys.def'
		modreg file 'authorized_keys' 'Authorized keys' 0 "$deffile"

		if [ "$DROPBEAR_SSHD_ENABLED" != "yes" ]; then
			echo "$DAEMON is disabled" 1>&2
			exit 1;
		fi

		start
		;;
	unload)
		stop
		modunreg file 'authorized_keys'
		modunreg cgi 'dropbear-sshd'
		;;
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		sleep 1
		start
		;;
	status)
		if [ -z "$(pidof "$DAEMON")" ]; then
			echo 'stopped'
		else
			echo 'running'
		fi
		;;
	*)
		echo "Usage: $0 [load|unload|start|stop|restart|status]" 1>&2
		exit 1
		;;
esac

exit 0