src/functions/functions.radvd

   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 RADVD_CONFIGFILE="/etc/radvd.conf"
  23
  24 radvd_update() {
  25         # (Re-)write the configuration file
  26         if radvd_write_config; then
  27                 # Reload the radvd service if it is already running
  28                 if service_is_active radvd; then
  29                         service_reload radvd
  30                         return ${EXIT_OK}
  31                 fi
  32
  33                 # Start the radvd service
  34                 service_start radvd
  35         fi
  36 }
  37
  38 radvd_clear_config() {
  39         log DEBUG "Clearing radv daemon configuration file"
  40
  41         config_header "radv daemon configuration file" > ${RADVD_CONFIGFILE}
  42
  43         return ${EXIT_OK}
  44 }
  45
  46 radvd_write_config() {
  47         radvd_clear_config
  48
  49         # Write the configuration for all zones.
  50         local zone
  51
  52         # The return value determine if radvd is started or not
  53         local return_value=${EXIT_FALSE}
  54
  55         for zone in $(zones_get_local); do
  56                 if __radvd_config_interface ${zone}; then
  57                         # We return TRUE when __radvd_config_interface returns True
  58                         return_value=${EXIT_TRUE}
  59                 fi
  60         done >> ${RADVD_CONFIGFILE}
  61
  62         return ${return_value}
  63 }
  64
  65 # This function return ${EXIT_FALSE} if no radvd config was written and ${EXIT_TRUE} in all other cases
  66 __radvd_config_interface() {
  67         local zone=${1}
  68         assert isset zone
  69
  70         log DEBUG "Writing radvd configuration for ${zone}."
  71
  72         # If the interface does not provide any routing information,
  73         # we can skip this whole stuff.
  74         if ! db_exists "${zone}/ipv6"; then
  75                 return ${EXIT_FALSE}
  76         fi
  77
  78         # Skip if zone is not active.
  79         local active="$(db_get "${zone}/ipv6/active")"
  80         [ "${active}" = "0" ] && return ${EXIT_FALSE}
  81
  82         # Skip if there is no prefix or prefix is link-local.
  83         local addr="$(db_get "${zone}/ipv6/local-ip-address")"
  84         if [ -z "${addr}" ] || [ "${addr:0:5}" = "fe80:" ]; then
  85                 return ${EXIT_FALSE}
  86         fi
  87
  88         # Check if the subnet is configured by the DHCP server.
  89         local dhcpd="false"
  90         local prefix="$(ipv6_get_network "${addr}")"
  91         if isset prefix && dhcpd_subnet_match ipv6 "${prefix}"; then
  92                 dhcpd="true"
  93         fi
  94
  95         print "interface ${zone} {"
  96         print " AdvSendAdvert on;"
  97         print " MinRtrAdvInterval 3;"
  98         print " MaxRtrAdvInterval 10;"
  99         print " IgnoreIfMissing on;"
 100
 101         if enabled dhcpd; then
 102                 print " AdvManagedFlag on;"
 103                 print " AdvOtherConfigFlag on;"
 104         fi
 105
 106         print
 107         print " prefix ::/64 {"
 108         print "         AdvOnLink on;"
 109
 110         if enabled dhcpd; then
 111                 print "         AdvRouterAddr off;"
 112                 print "         AdvAutonomous off;"
 113         else
 114                 print "         AdvRouterAddr on;"
 115                 print "         AdvAutonomous on;"
 116         fi
 117
 118         print " };"
 119         print
 120
 121         # Add the DNS configuration.
 122         __radvd_config_dns ${zone}
 123
 124         print "};"
 125         print
 126
 127         return ${EXIT_TRUE}
 128 }
 129
 130 __radvd_config_dns() {
 131         local zone=${1}
 132
 133         # Do nothing, when this option is not enabled.
 134         enabled DNS_ADVERTISE_SERVERS || return ${EXIT_OK}
 135
 136         # XXX it is kind of difficult to announce our local
 137         # resolver.
 138
 139         local server servers
 140         for server in $(dns_server_list_sorted); do
 141                 # Filter out non IPv6 addresses.
 142                 ipv6_is_valid ${server} || continue
 143
 144                 servers="${servers} ${server}"
 145         done
 146
 147         # Remove whitespaces.
 148         servers=$(echo ${servers})
 149
 150         # If there are no servers to announce, we stop right here.
 151         if ! isset servers; then
 152                 log DEBUG "No servers to announce."
 153                 return ${EXIT_OK}
 154         fi
 155
 156         print " RDNSS ${servers} {"
 157         print "         # Use the defaults here."
 158         print " };"
 159         print
 160 }