#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening
#

#
# Ensure dnsmasq services are not in use (Automated)
#

set -e # One error, it's over
set -u # One variable unset, it's over

# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Ensure dnsmasq services are not in use."
PACKAGE='dnsmasq'
SERVICE="dnsmasq.service"

# 2 scenario here:
# - dnsmasq is a dependency for another package -> disable the service
# - dnsmasq is not a dependency for another package -> remove the package

# This function will be called if the script status is on enabled / audit mode
audit() {
    # 0 means true in bash
    PACKAGE_INSTALLED=1
    PACKAGE_IS_DEPENDENCY=1
    SERVICE_ENABLED=1

    is_pkg_installed "$PACKAGE"
    [ "$FNRET" = 0 ] && PACKAGE_INSTALLED=0 # 0 means true in bash

    is_pkg_a_dependency "$PACKAGE"
    # dnsmasq is installed with dnsmasq-base, which
    [ "$FNRET" = 0 ] && PACKAGE_IS_DEPENDENCY=0

    is_service_enabled "$SERVICE"
    [ "$FNRET" = 0 ] && SERVICE_ENABLED=0

    if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
        crit "$PACKAGE is installed and not a dependency"
    elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ]; then
        crit "$SERVICE is enabled"
    else
        ok "$PACKAGE is not in use"
    fi
}

# This function will be called if the script status is on enabled mode
apply() {
    audit
    if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
        crit "$PACKAGE is installed and not a dependency, removing it"
        apt-get purge "$PACKAGE" -y
        apt-get autoremove -y
    elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ] && [ "$IS_CONTAINER" -eq 1 ]; then
        crit "$SERVICE is enabled, i'm going to stop and mask it"
        systemctl stop "$SERVICE"
        systemctl mask "$SERVICE"
    else
        ok "$PACKAGE is not in use"
    fi
}

# This function will check config parameters required
check_config() {
    :
}

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    # shellcheck source=../../debian/default
    . /etc/default/cis-hardening
fi
if [ -z "$CIS_LIB_DIR" ]; then
    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
    echo "Cannot source CIS_LIB_DIR variable, aborting."
    exit 128
fi

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
    # shellcheck source=../../lib/main.sh
    . "${CIS_LIB_DIR}"/main.sh
else
    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
    exit 128
fi