LSBInitScript for Wireguard: This is a leightweight init script for Wireguard. While Wireguard itself requires only minimal overhead to setup and start, it still requires some script invocations (e.g. during boot).

wireguard

#! /bin/bash

# Copyright (c) 2021 Karol Babioch <karol@babioch.de>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# LSBInitScript for Wireguard: This is a leightweight init script for
# Wireguard. While Wireguard itself requires only minimal overhead to setup and
# start, it still requires some script invocations (e.g. during boot).
#
# Most distributions are using systemd by now, and as such can use
# wg-quick@.service. However some distributions / images / Linux appliances
# are not (yet) using systemd. In such cases, this init script could be used
# to (re)start and/or stop Wireguard.
#
# It can handle all configured Wireguard interfaces (within /etc/wireguard)
# globally and/or individual interfaces, e.g. (/etc/init.d/wireguard start wg0).
#
# It relies on wg(8) and wg-quick(8) in the background.

### BEGIN INIT INFO
# Provides:          wireguard
# Required-Start:    $network $syslog
# Required-Stop:     $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Starts Wireguard interfaces
# Description:       Sets up Wireguard interfaces (by means of wg-quick).
### END INIT INFO

CONFIG_DIR=/etc/wireguard

function get_active_wg_interfaces() {
  INTERFACES=$(wg | grep "interface:" | sed 's/interface: /\1/')
  echo "$INTERFACES"
}

# This is required for wg-quick(1) to work correctly, i.e. for process
# substitution (`<()`) to work in Bash. If missing, wg-quick will fail with a
# "fopen: No such file or directory" error.
[ -e /dev/fd ] || ln -sf /proc/self/fd /dev/fd

case "$1" in

  start)
    if [ -z "$2" ]; then
      echo "Starting all configured Wireguard interfaces"
      for CONFIG in $(cd $CONFIG_DIR; ls *.conf); do
        wg-quick up ${CONFIG%%.conf}
      done
    else
      echo "Starting Wireguard interface: $2"
      wg-quick up "$2"
    fi
    ;;

  stop)
    if [ -z "$2" ]; then
      echo "Stopping all active Wireguard interfaces"
      INTERFACES=$(get_active_wg_interfaces)
      for INTERFACE in $INTERFACES; do
        wg-quick down "$INTERFACE"
      done
    else
      echo "Stopping Wireguard interface: $2"
      wg-quick down "$2"
    fi
    ;;

  reload|force-reload)
    if [ -z "$2" ]; then
      echo "Reloading configuration for all active Wireguard interfaces"
      INTERFACES=$(get_active_wg_interfaces)
      for INTERFACE in $INTERFACES; do
        wg syncconf "$INTERFACE" <(wg-quick strip "$INTERFACE")
      done
    else
      echo "Reloading configuration for Wireguard interface: $2"
      wg syncconf "$2" <(wg-quick strip "$2")
    fi
    ;;

  restart)
    $0 stop "$2"
    sleep 1
    $0 start "$2"
    ;;

  status)
    # TODO Check exit codes and align them with LSB requirements
    if [ -z "$2" ]; then
      INTERFACES=$(get_active_wg_interfaces)
      for INTERFACE in $INTERFACES; do
        wg show $INTERFACE
      done
    else
      wg show "$2"
    fi
    ;;

  *)
    echo "Usage: $0 { start | stop | restart | reload | force-reload | status } [INTERFACE]"
    exit 1
    ;;

esac