#!/bin/sh
### BEGIN INIT INFO
# Provides:          autossh-tunnel-<%= name %>
# Required-Start:    $local_fs $remote_fs $network
# Required-Stop:     $local_fs $remote_fs $network
# Should-Start:      $syslog
# Should-Stop:       $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Autossh tunnel <%= name %>
# Description:       Maintain an SSH tunnel between two hosts.
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
USERNAME=<%= user %>

DESC="secure tunnel"
NAME=autossh-tunnel-<%= name %>
REAL_NAME=autossh
DAEMON=$(which $REAL_NAME)
PIDFILE="/var/run/autossh-tunnel-<%= name %>.pid"
SCRIPTNAME=/etc/init.d/$NAME

. /lib/lsb/init-functions

#
# AutoSSH configuration
#
AUTOSSH_ARGS="-M <%= monitor_port %> -N -o ServerAliveInterval=30 -o ServerAliveCountMax=3 -L <%= bind_address %>:<%= port %>:<%= host %>:<%= hostport %> <%= remote_host %>"
<% if gatetime != 'absent' -%>
AUTOSSH_GATETIME=<%= gatetime %>
<% end -%>
<% if first_poll != 'absent' -%>
AUTOSSH_FIRST_POLL=<%= first_poll %>
<% end -%>
<% if poll != 'absent' -%>
AUTOSSH_POLL=<%= poll %>
<% end -%>
<% if maxstart != 'absent' -%>
AUTOSSH_MAXSTART=<%= maxstart %>
<% end -%>
<% if maxlifetime != 'absent' -%>
AUTOSSH_MAXLIFETIME=<%= maxlifetime %>
<% end -%>
<% if logfile != 'absent' -%>
AUTOSSH_LOGFILE=<%= logfile %>
<% end -%>

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

#
# Function that starts the daemon/service
#
do_start()
{
    # Export the autossh configuration
    if [ -n "$AUTOSSH_GATETIME" ]; then
          export AUTOSSH_GATETIME
    fi
    if [ -n "$AUTOSSH_FIRST_POLL" ]; then
          export AUTOSSH_FIRST_POLL
    fi
    if [ -n "$AUTOSSH_POLL" ]; then
          export AUTOSSH_POLL
    fi
    if [ -n "$AUTOSSH_MAXSTART" ]; then
          export AUTOSSH_MAXSTART
    fi
    if [ -n "$AUTOSSH_MAXLIFETIME" ]; then
          export AUTOSSH_MAXLIFETIME
    fi
    if [ -n "$AUTOSSH_LOGFILE" ]; then
          export AUTOSSH_LOGFILE
    fi

    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    pidofproc -p "$PIDFILE" "$DAEMON" >/dev/null && return 1
    start-stop-daemon --chuid $USERNAME --start --pidfile $PIDFILE --make-pidfile \
            --exec $DAEMON --background -- $AUTOSSH_ARGS \
            || return 2
    
    # if autossh was started but bad arguments were passed to ssh, autossh will 
    # return 0 but exit after a few seconds, so we wait just a bit to make sure
    # everything is ok
    sleep 5
    pidofproc -p "$PIDFILE" "$DAEMON" >/dev/null || return 2    
}

#
# Function that stops the daemon/service
#
do_stop()
{
        # Return
        #   0 if daemon has been stopped
        #   1 if daemon was already stopped
        #   2 if daemon could not be stopped
        #   other if a failure occurred
        start-stop-daemon --stop --quiet --retry=TERM/10/KILL/5 --pidfile $PIDFILE --name $REAL_NAME
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2

        # Wait for children to finish too if this is a daemon that forks
        # and if the daemon is only ever run from this initscript.
        # If the above conditions are not satisfied then add some other code
        # that waits for the process to drop all resources that could be
        # needed by services started subsequently.  A last resort is to
        # sleep for some time.

        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
        [ "$?" = 2 ] && return 2

        # Many daemons don't delete their pidfiles when they exit.
        rm -f $PIDFILE

        return "$RETVAL"
}

case "$1" in
  start)
        log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
                0) log_end_msg 0 ;;
                1) log_progress_msg "was already running" && log_end_msg 0 ;;
                *) log_end_msg 1 ;; # Failed to start
        esac
        ;;
  stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
                0) log_end_msg 0 ;;
                1) log_progress_msg "was already stopped" && log_end_msg 0 ;;
                *) log_end_msg 1 ;; # Failed to stop
        esac
        ;;
  restart|force-reload)
        #
        # If the "reload" option is implemented then remove the
        # 'force-reload' alias
        #
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
          0|1)
                do_start
                case "$?" in
                    0) log_end_msg 0 ;;
                    1) log_progress_msg "was already running" && log_end_msg 0 ;;
                    *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
          *)
                log_end_msg 1 ;;
        esac
        ;;
  status)
        status_of_proc -p "$PIDFILE" "$DAEMON" $NAME && exit 0 || exit $?
        ;;
  *)
        echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload|status}" >&2
        exit 3
        ;;
esac