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#!/usr/bin/env bash

# Copyright (c) 2014-present, The osquery authors
#
# This source code is licensed as defined by the LICENSE file found in the
# root directory of this source tree.
#
# SPDX-License-Identifier: (Apache-2.0 OR GPL-2.0-only)

set -e

ensure_root() {
  if [ $UID -ne 0 ]; then
    echo "User has insufficient privileges. $0 must be run as root."
    exit 4
  fi
}

check_config() {
  if [ -e $REAL_CONFIG_PATH ]; then
    $EXEC --config_path=$REAL_CONFIG_PATH --config_check
  elif [ -e $FLAGS_FILE_PATH ]; then
    :
  else
    echo "No osquery config file found at $REAL_CONFIG_PATH"
    echo "See '$EXAMPLE_CONFIG_PATH' for an example config."
    exit 4
  fi
}

# Use this function to detect the operating system that this
platform() {
  local  __resultvar=$1
  if [[ -f "/etc/redhat-release" ]]; then
    eval $__resultvar="centos"
  elif [[ -f "/etc/lsb-release" ]]; then
    eval $__resultvar="ubuntu"
  else
    eval $__resultvar=`uname -s | tr '[:upper:]' '[:lower:]'`
  fi
}

exec_with_env() {
  REAL_CONFIG_PATH=$REAL_CONFIG_PATH \
  EXAMPLE_CONFIG_PATH=$EXAMPLE_CONFIG_PATH \
  PIDFILE=$PIDFILE \
  LOCKFILE=$LOCKFILE \
  EXEC=$EXEC \
  PROG=$PROG \
  $1
  return $?
}

start() {
  check_config
  if [ $OS = "darwin" ]; then
    if [ ! -f $FLAGS_FILE_PATH ]; then
      touch $FLAGS_FILE_PATH
    fi 
    cp $PLIST_INSTALLATION_PATH $PLIST_PATH
    launchctl load $PLIST_PATH
  else
    exec_with_env "service osqueryd start"
  fi
}

stop() {
  if [ $OS = "darwin" ]; then
    launchctl unload $PLIST_PATH
    rm $PLIST_PATH
  else
    exec_with_env "service osqueryd stop"
  fi
}

restart() {
  stop
  start
}

status() {
  if [ $OS = "darwin" ]; then
    if [[ "$LAUNCHCTL_LIST" = "" || "$LAUNCHCTL_LIST_PID" = "-" ]]; then
      echo "$PLIST_DOMAIN is not running"
    else
      echo "$PLIST_DOMAIN is running. pid: $LAUNCHCTL_LIST_PID"
    fi
  else
    exec_with_env "service osqueryd status"
  fi
}

clean() {
  if [ -d $OSQUERY_DB ]; then
    rm -rf $OSQUERY_DB
  fi
}

usage() {
  echo "Usage: $0 {clean|config-check|start|stop|status|restart}"
  exit 2
}

main() {
  ensure_root
  platform OS

if [[ $OS = "darwin" ]]; then
    REAL_CONFIG_PATH="/var/osquery/osquery.conf"
    FLAGS_FILE_PATH="/var/osquery/osquery.flags"
    EXAMPLE_CONFIG_PATH="/var/osquery/osquery.example.conf"
    PIDFILE="/var/osquery/osquery.pid"
    LOCKFILE="/var/osquery/osquery.lock"
    EXEC="/opt/osquery/lib/osquery.app/Contents/MacOS/osqueryd"
    PLIST_DOMAIN="io.osquery.agent"
    PLIST_PATH="/Library/LaunchDaemons/$PLIST_DOMAIN.plist"
    PLIST_INSTALLATION_PATH="/var/osquery/$PLIST_DOMAIN.plist"
    LAUNCHCTL_LIST=`launchctl list | grep io.osquery.agent || true`
    LAUNCHCTL_LIST_PID=`echo $LAUNCHCTL_LIST | awk '{ print $1 }'`
  else
    INIT_SCRIPT_PATH="/etc/init.d/osqueryd"
    SERVICE_SCRIPT_PATH="/usr/lib/systemd/system/osqueryd.service"
    if [[ ! -e "$INIT_SCRIPT_PATH" && ! -f "$SERVICE_SCRIPT_PATH" ]]; then
      echo "Cannot find the init.d script at $INIT_SCRIPT_PATH"
      echo "Additionally, no systemd service at $SERVICE_SCRIPT_PATH"
      exit 6
    fi

REAL_CONFIG_PATH="/etc/osquery/osquery.conf"
    EXAMPLE_CONFIG_PATH="/opt/osquery/share/osquery/osquery.example.conf"
    PIDFILE="/var/run/osquery.pid"
    LOCKFILE="/var/lock/subsys/osqueryd"
    EXEC="/opt/osquery/bin/osqueryd"
  fi

OSQUERY_DB="/var/osquery/osquery.db"
  PROG="osqueryd"

case "$1" in
    clean)
      $1
      ;;
    start)
      $1
      ;;
    stop)
      $1
      ;;
    restart)
      $1
      ;;
    status)
      $1
      ;;
    config-check)
      check_config
      ;;
    *)
      usage
      ;;
  esac
}

main $@
exit 0