#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2013  IPFire Network Development Team                         #
#                                                                             #
# 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/>.       #
#                                                                             #
###############################################################################

SYSCTL_PATH="/proc/sys"

function sysctl_key_to_path() {
	local key="${1}"
	assert isset key

	print "${SYSCTL_PATH}/${key//.//}"

	return ${EXIT_OK}
}

function sysctl_key_exists() {
	local key="${1}"
	assert isset key

	local path="$(sysctl_key_to_path "${key}")"

	[ -e "${path}" ] && return ${EXIT_OK}
	return ${EXIT_ERROR}
}

function sysctl_get() {
	local key="${1}"
	assert isset key

	fread "$(sysctl_key_to_path "${key}")" || return $?
	return ${EXIT_OK}
}

function sysctl_set() {
	local key="${1}"
	assert isset key

	local value="${2}"

	fwrite "$(sysctl_key_to_path "${key}")" "${value}" || return $?
	return ${EXIT_OK}
}

function sysctl_set_bool() {
	local key="${1}"

	local value="${2}"
	if enabled value; then
		value="1"
	else
		value="0"
	fi

	sysctl_set "${key}" "${value}"
}

function sysctl_set_recursively() {
	local basekey="${1}"
	assert isset basekey

	local subkey="${2}"
	assert isset subkey

	local value="${3}"

	local basepath="$(sysctl_key_to_path "${basekey}")"
	local subpath="/${subkey//\.//}"

	local path
	for path in $(find "${basepath}" -type f); do
		[[ ${path} =~ ${subpath}$ ]] || continue

		fwrite "${path}" "${value}"
	done

	return ${EXIT_OK}
}