#!/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
description='Flow-based network traffic analyser'
softflowd="/usr/sbin/$name"
pid_dir="/var/run/$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 config
    instance="$1"
    config="$2"

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

    interface=
    options=

    . "$config"

    [ "$interface" ] || return 2

    local pid_file ctl_sock
    pid_file="$pid_dir$instance.pid"
    ctl_sock="$pid_dir$instance.ctl"
    start-stop-daemon --start --quiet \
        --pid_file "$pid_file" --exec "$softflowd" --test >/dev/null ||
        return 1
    # shellcheck disable=SC2086 # We have to trust the config file
    start-stop-daemon --start --quiet \
        --pid_file "$pid_file" \
        --exec "$softflowd" -- \
        -p "$pid_file" -c "$ctl_sock" \
        -i "$interface" $options ||
        return 2
    sleep 1
    start-stop-daemon --start --quiet \
        --pid_file "$pid_file" --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 pid_file retval
    instance="$1"
    pid_file="$pid_dir/$instance.pid"

    start-stop-daemon --stop --quiet \
        --retry=TERM/30/KILL/5 --pid_file "$pid_file" --name "$name"
    retval="$?"
    [ "$retval" = 2 ] && return 2
    # Many daemons don't delete their pidfiles when they exit.
    rm -f "$pid_file"
    return "$retval"
}

exit=0

do_action() {
    local config
    config="$1"

    instance="$(basename "${config%%.conf}")"

    case "$action" in
        start)
            [ "$VERBOSE" != no ] && log_daemon_msg "Starting $description" "$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 $description" "$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 "$pid_dir/$instance.pid" "$softflowd" "softflowd instance $instance" || exit=$?
            ;;
        restart | force-reload)
            log_daemon_msg "Restarting $description" "$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