File: init

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tayga 0.9.2-8
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#!/bin/sh
#
# Copyright (c) 2007 Javier Fernandez-Sanguino <jfs@debian.org>
# Modified by Andrew Shadura <bugzilla@tut.by>
#
# This is free software; you may redistribute it and/or modify
# it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2,
# or (at your option) any later version.
#
# This is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License with
# the Debian operating system, in /usr/share/common-licenses/GPL;  if
# not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
#
### BEGIN INIT INFO
# Provides:          tayga
# Required-Start:    $network $local_fs $remote_fs
# Required-Stop:     $remote_fs
# Should-Start:      
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: userspace NAT64
# Description: TAYGA is a stateless NAT64 userspace daemon.  Using the
#		in-kernel TUN network driver, TAYGA receives IPv4 and
#		IPv6 packets, translates them to the other protocol,
#		and sends the translated packets back using the same
#		TUN interface.
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

DAEMON=/usr/sbin/tayga # Introduce the server's location here
NAME=tayga                    # Introduce the short server's name here
DESC="userspace NAT64"   # Introduce a short description here

PIDFILE=/var/run/$NAME.pid

test -x "$DAEMON" || exit 0

. /lib/lsb/init-functions

# Default options, these can be overriden by the information
# at /etc/default/$NAME
DAEMON_OPTS="--nodetach"          # Additional options given to the server

DIETIME=10              # Time to wait for the server to die, in seconds
                        # If this value is set too low you might not
                        # let some servers to die gracefully and
                        # 'restart' will not work

STARTTIME=2             # Time to wait for the server to start, in seconds
                        # If this value is set each time the server is
                        # started (on start or restart) the script will
                        # stall to try to determine if it is running
                        # If it is not set and the server takes time
                        # to setup a pid file the log message might
                        # be a false positive (says it did not start
                        # when it actually did)

TUN_DEVICE=$(sed -rn "/^[ \t]*tun-device/s/^[ \t]*tun-device[ \t]+//p" /etc/tayga.conf)
IPV6_PREFIX=$(sed -rn "/^[ \t]*prefix/s/^[ \t]*prefix[ \t]+//p" /etc/tayga.conf)
DYNAMIC_POOL=$(sed -rn "/^[ \t]*dynamic-pool/s/^[ \t]*dynamic-pool[ \t]+//p" /etc/tayga.conf)
CONFIGURE_IFACE="no"
CONFIGURE_NAT44="no"

# Include defaults if available
if [ -f "/etc/default/$NAME" ] ; then
    . "/etc/default/$NAME"
fi

set -e

running_pid() {
# Check if a given process pid's cmdline matches a given name
    pid="$1"
    name="$2"
    [ -z "$pid" ] && return 1
    [ ! -d "/proc/$pid" ] &&  return 1
    return 0
}

running() {
# Check if the process is running looking at /proc
# (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return 1
    pid=$(cat $PIDFILE)
    running_pid "$pid" "$DAEMON" || return 1
    return 0
}

start_server() {
    if [ "$CONFIGURE_IFACE" = "yes" ] ; then
		"$DAEMON" --mktun | logger -t "$NAME" -i
		ip link set "$TUN_DEVICE" up
		[ -n "$DYNAMIC_POOL" ] && ip route add "$DYNAMIC_POOL" dev "$TUN_DEVICE"
		[ -n "$IPV6_PREFIX" ] && ip route add "$IPV6_PREFIX" dev "$TUN_DEVICE"
		[ -n "$IPV4_TUN_ADDR" ] && ip addr add "$IPV4_TUN_ADDR" dev "$TUN_DEVICE"
		[ -n "$IPV6_TUN_ADDR" ] && ip addr add "$IPV6_TUN_ADDR" dev "$TUN_DEVICE"
    fi
    [ "$CONFIGURE_NAT44" = "yes" ] && [ -n "$DYNAMIC_POOL" ] && iptables -t nat -A POSTROUTING -s "$DYNAMIC_POOL" -j MASQUERADE || true

	start-stop-daemon --start --quiet \
		-b --exec "$DAEMON" --  --pidfile "$PIDFILE" $DAEMON_OPTS
}

stop_server() {
	start-stop-daemon --stop --quiet --pidfile "$PIDFILE"
	errcode=$?
	if [ "$CONFIGURE_IFACE" = "yes" ] ; then
		ip link set "$TUN_DEVICE" down
		"$DAEMON" --rmtun | logger -t "$NAME" -i
	fi
	[ "$CONFIGURE_NAT44" = "yes" ] && [ -n "$DYNAMIC_POOL" ] && iptables -t nat -D POSTROUTING -s "$DYNAMIC_POOL" -j MASQUERADE || true
	rm -f "$PIDFILE"

	return $errcode
}

force_stop() {
# Force the process to die killing it manually
    [ ! -e "$PIDFILE" ] && return
    if running ; then
        kill -15 $pid
        # Is it really dead?
        sleep "$DIETIME"s
        if running ; then
            kill -9 $pid
            sleep "$DIETIME"s
            if running ; then
                echo "Cannot kill $NAME (pid=$pid)!"
                exit 1
            fi
        fi
    fi
    rm -f "$PIDFILE"
}


case "$1" in
  start)
        log_daemon_msg "Starting $DESC" "$NAME"
        # Check if it's running first
        if running ;  then
            log_progress_msg "apparently already running"
            log_end_msg 0
            exit 0
        fi
        if start_server ; then
            # NOTE: Some servers might die some time after they start,
            # this code will detect this issue if STARTTIME is set
            # to a reasonable value
            [ -n "$STARTTIME" ] && sleep $STARTTIME # Wait some time 
            if  running ;  then
                # It's ok, the server started and is running
                log_end_msg 0
            else
                # It is not running after we did start
                log_end_msg 1
            fi
        else
            # Either we could not start it
            log_end_msg 1
        fi
        ;;
  stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        if running ; then
            # Only stop the server if we see it running
            errcode=0
            stop_server || errcode=$?
            log_end_msg $errcode
        else
            # If it's not running don't do anything
            log_progress_msg "apparently not running"
            log_end_msg 0
            exit 0
        fi
        ;;
  force-stop)
        # First try to stop gracefully the program
        $0 stop
        if running; then
            # If it's still running try to kill it more forcefully
            log_daemon_msg "Stopping (force) $DESC" "$NAME"
            errcode=0
            force_stop || errcode=$?
            log_end_msg $errcode
        fi
        ;;
  restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        errcode=0
        stop_server || errcode=$?
        # Wait some sensible amount, some server need this
        [ -n "$DIETIME" ] && sleep $DIETIME
        start_server || errcode=$?
        [ -n "$STARTTIME" ] && sleep $STARTTIME
        running || errcode=$?
        log_end_msg $errcode
        ;;
  status)

        log_daemon_msg "Checking status of $DESC" "$NAME"
        if running ;  then
            log_progress_msg "running"
            log_end_msg 0
        else
            log_progress_msg "apparently not running"
            log_end_msg 1
            exit 1
        fi
        ;;
  # Use this if the daemon cannot reload
  reload)
        log_warning_msg "Reloading $NAME daemon: not implemented, as the daemon"
        log_warning_msg "cannot re-read the config file (use restart)."
        ;;
  *)
        N=/etc/init.d/$NAME
        echo "Usage: $N {start|stop|force-stop|restart|force-reload|status}" >&2
        exit 1
        ;;
esac

exit 0