functions.ipv4

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
   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 IP_SUPPORTED_PROTOCOLS="${IP_SUPPORTED_PROTOCOLS} ipv4"
  23
  24 function ipv4_is_valid() {
  25         ipcalc --ipv4 -c $@ >/dev/null 2>&1
  26
  27         case "$?" in
  28                 0)
  29                         return ${EXIT_OK}
  30                         ;;
  31                 *)
  32                         return ${EXIT_ERROR}
  33                         ;;
  34         esac
  35 }
  36
  37 function ipv4_detect_duplicate() {
  38         local device=${1}
  39         local address=${2}
  40
  41         assert isset address
  42         assert isset device
  43         assert device_exists ${device}
  44
  45         # Don't check on PPP devices.
  46         device_is_ppp ${device} && return ${EXIT_ERROR}
  47
  48         if ! arping -q -c 2 -w 3 -D -I ${device} ${address}; then
  49                 log DEBUG "Detected duplicate address '${address}' on device '${device}'."
  50                 return ${EXIT_OK}
  51         fi
  52
  53         return ${EXIT_ERROR}
  54 }
  55
  56 function ipv4_update_neighbours() {
  57         local device=${1}
  58         local address=${2}
  59
  60         # Don't do anything on PPP devices.
  61         device_is_ppp ${device} && return ${EXIT_OK}
  62
  63         arping -q -A -c 1 -I ${device} ${address}
  64         ( sleep 2; arping -q -U -c 1 -I ${device} ${address} ) >/dev/null 2>&1 </dev/null &
  65 }
  66
  67 function ipv4_get_netaddress() {
  68         local address=${1}
  69         assert isset address
  70
  71         local prefix=$(ip_get_prefix ${address})
  72         assert isset prefix
  73
  74         local NETWORK
  75         eval $(ipcalc --network ${address})
  76         assert isset NETWORK
  77
  78         echo "${NETWORK}/${prefix}"
  79
  80         return ${EXIT_OK}
  81 }
  82
  83 function ipv4_get_prefix() {
  84         local address=${1}
  85         local broadcast=${2}
  86
  87         assert isset address
  88         assert isset broadcast
  89
  90         local PREFIX
  91         eval $(ipcalc --prefix ${address} ${broadcast})
  92         assert isset PREFIX
  93
  94         echo "${PREFIX}"
  95         return ${EXIT_OK}
  96 }
  97
  98 function ipv4_flush_device() {
  99         #
 100         # Flushes all routes, addresses from the device
 101         # and clears the ARP cache.
 102         #
 103
 104         local device=${1}
 105         assert isset device
 106
 107         ip -4 addr flush dev ${device} >/dev/null 2>&1
 108         ip -4 route flush dev ${device} >/dev/null 2>&1
 109         ip -4 neigh flush dev ${device} >/dev/null 2>&1
 110
 111         return 0
 112
 113 function ipv4_prefix2netmask() {
 114         local prefix=${1}
 115         shift
 116
 117         assert isinteger prefix
 118
 119         # XXX this function is a stub
 120
 121         case "${prefix}" in
 122                 24)
 123                         echo "255.255.255.0"
 124                         ;;
 125                 *)
 126                         assert false NOT IMPLEMENTED
 127                         ;;
 128         esac
 129 }