#!/bin/sh

### BEGIN INIT INFO
# Provides:          softflowd
# Required-Start:    $network $remote_fs $syslog
# Required-Stop:     $network $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Flow-based network traffic analyser
# Description:       Manage all softflowd exports defined in
#                    /etc/softflowd/*.conf
### END INIT INFO

PATH=/sbin:/usr/sbin:/bin:/usr/bin
NAME=softflowd
DESC='Flow-based network traffic analyser'
SOFTFLOWD="/usr/sbin/$NAME"
PIDDIR="/var/run/$NAME/"
PRIVDROP_CHROOT_DIR='/var/run/softflowd/chroot'

[ -x "$SOFTFLOWD" ] || exit 0

if [ "$1" = 'start' ] ; then
    mkdir -p "$PRIVDROP_CHROOT_DIR"
    if [ -e /var/run/softflowd.ctl ] ; then
        [ -L /var/run/softflowd.ctl ] || rm /var/run/softflowd.ctl
    fi
    [ -e /var/run/softflowd.ctl ] || ln -s /var/run/softflowd/default.ctl /var/run/softflowd.ctl
    install -D -p /etc/protocols "$PRIVDROP_CHROOT_DIR/etc/protocols"
fi

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB functions
. /lib/lsb/init-functions

# Start a softflowd instance
#
# Return
#   0 if daemon has been started
#   1 if daemon was already running
#   2 if daemon could not be started
do_start () {
    local INSTANCE="$1"
    local CONFIG="$2"

    sh -n "$CONFIG" 2>/dev/null || return 2

    interface=
    options=

    . "$CONFIG"

    [ "$interface" ] || return 2

    local PIDFILE="$PIDDIR$INSTANCE.pid"
    local CTLSOCK="$PIDDIR$INSTANCE.ctl"
    start-stop-daemon --start --quiet \
        --pidfile "$PIDFILE" --exec "$SOFTFLOWD" --test > /dev/null \
        || return 1
    start-stop-daemon --start --quiet \
        --pidfile "$PIDFILE" \
        --exec "$SOFTFLOWD" -- \
        -p "$PIDFILE" -c "$CTLSOCK" \
        -i "$interface" $options \
        || return 2
    sleep 1
    start-stop-daemon --start --quiet \
        --pidfile "$PIDFILE" --exec "$SOFTFLOWD" --test > /dev/null \
        && return 2
}

# Stop a softflowd instance
#
# 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
do_stop () {
    local INSTANCE="$1"

    local PIDFILE="$PIDDIR/$INSTANCE.pid"
    start-stop-daemon --stop --quiet \
        --retry=TERM/30/KILL/5 --pidfile "$PIDFILE" --name "$NAME"
    RETVAL="$?"
    [ "$RETVAL" = 2 ] && return 2
    # Many daemons don't delete their pidfiles when they exit.
    rm -f "$PIDFILE"
    return "$RETVAL"
}

EXIT=0

do_action () {
    local CONFIG="$1"

    INSTANCE="$(basename "${CONFIG%%.conf}")"

    case "$ACTION" in
        start)
            [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$INSTANCE"
            do_start "$INSTANCE" "$CONFIG"
            case "$?" in
                0|1)    [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2)
                    [ "$VERBOSE" != no ] && log_end_msg 1
                    EXIT=1
                    ;;
            esac
            ;;
        stop)
            [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$INSTANCE"
            do_stop "$INSTANCE"
            case "$?" in
                0|1)    [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2)
                    [ "$VERBOSE" != no ] && log_end_msg 1
                    EXIT=1
                    ;;
            esac
            ;;
        status)
            status_of_proc -p "$PIDDIR/$INSTANCE.pid" "$SOFTFLOWD" "softflowd instance $INSTANCE" || EXIT=$?
            ;;
        restart|force-reload)
            log_daemon_msg "Restarting $DESC" "$INSTANCE"
            do_stop "$INSTANCE"
            case "$?" in
                0|1)
                    do_start "$INSTANCE" "$CONFIG"
                    case "$?" in
                        0)  log_end_msg 0 ;;
                        *)
                            # Old process is still running or
                            # failed to start
                            log_end_msg 1 ;;
                    esac
                    ;;
                *)
                    # Failed to stop
                    log_end_msg 1
                    ;;
                esac
            ;;
        *)
            echo "Usage: /etc/init.d/softflowd {start|stop|status|restart|force-reload} [<instance> ...]" >&2
            exit 3
            ;;
    esac
}


ACTION="$1"
shift

if [ "$1" ] ; then
    while [ "$1" ] ; do
        CONFIG="/etc/softflowd/$1.conf"
        if [ -f "$CONFIG" ] ; then
            do_action "$CONFIG"
        fi
        shift
    done
else
    for CONFIG in /etc/softflowd/*.conf ; do
        if [ -f "$CONFIG" ] ; then
            do_action "$CONFIG"
        fi
    done
fi

exit $EXIT