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 function ipv4_split_prefix() {
  23         ip_split_prefix $@
  24 }
  25
  26 function ipv4_is_valid() {
  27         local address=${1}
  28
  29         assert isset address
  30
  31         # Cut the /24 if there is one given
  32         address=$(ipv4_split_prefix ${address})
  33
  34         local IFS="."
  35         local octet
  36         local count
  37         for octet in ${address}; do
  38                 if [ ${octet} -ge 0 ] && [ ${octet} -le 255 ]; then
  39                         count=$(( ${count} + 1 ))
  40                         continue
  41                 fi
  42
  43                 # If we get here the address was not valid
  44                 break
  45         done
  46
  47         if [ ${count} -eq 4 ]; then
  48                 return ${EXIT_OK}
  49         fi
  50
  51         return ${EXIT_ERROR}
  52 }
  53
  54 function ipv4_detect_duplicate() {
  55         local device=${1}
  56         local address=${2}
  57
  58         assert isset address
  59         assert isset device
  60         assert device_exists ${device}
  61
  62         if ! arping -q -c 2 -w 3 -D -I ${device} ${address}; then
  63                 log DEBUG "Detected duplicate address '${address}' on device '${device}'."
  64                 return ${EXIT_ERROR}
  65         fi
  66
  67         return ${EXIT_OK}
  68 }
  69
  70 function ipv4_update_neighbours() {
  71         local device=${1}
  72         local address=${2}
  73
  74         arping -q -A -c 1 -I ${device} ${address}
  75         ( sleep 2; arping -q -U -c 1 -I ${device} ${address} ) >/dev/null 2>&1 </dev/null &
  76 }