functions.sysctl

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2013  IPFire Network Development Team                         #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 SYSCTL_PATH="/proc/sys"
  23
  24 function sysctl_key_to_path() {
  25         local key="${1}"
  26         assert isset key
  27
  28         print "${SYSCTL_PATH}/${key//.//}"
  29
  30         return ${EXIT_OK}
  31 }
  32
  33 function sysctl_key_exists() {
  34         local key="${1}"
  35         assert isset key
  36
  37         local path="$(sysctl_key_to_path "${key}")"
  38
  39         [ -e "${path}" ] && return ${EXIT_OK}
  40         return ${EXIT_ERROR}
  41 }
  42
  43 function sysctl_get() {
  44         local key="${1}"
  45         assert isset key
  46
  47         fread "$(sysctl_key_to_path "${key}")" || return $?
  48         return ${EXIT_OK}
  49 }
  50
  51 function sysctl_set() {
  52         local key="${1}"
  53         assert isset key
  54
  55         local value="${2}"
  56
  57         fwrite "$(sysctl_key_to_path "${key}")" "${value}" || return $?
  58         return ${EXIT_OK}
  59 }
  60
  61 function sysctl_set_bool() {
  62         local key="${1}"
  63
  64         local value="${2}"
  65         if enabled value; then
  66                 value="1"
  67         else
  68                 value="0"
  69         fi
  70
  71         sysctl_set "${key}" "${value}"
  72 }
  73
  74 function sysctl_set_recursively() {
  75         local basekey="${1}"
  76         assert isset basekey
  77
  78         local subkey="${2}"
  79         assert isset subkey
  80
  81         local value="${3}"
  82
  83         local basepath="$(sysctl_key_to_path "${basekey}")"
  84         local subpath="/${subkey//\.//}"
  85
  86         local path
  87         for path in $(find "${basepath}" -type f); do
  88                 [[ ${path} =~ ${subpath}$ ]] || continue
  89
  90                 fwrite "${path}" "${value}"
  91         done
  92
  93         return ${EXIT_OK}
  94 }