net/unbound/files/odhcpd.sh

   1 #!/bin/sh
   2 ##############################################################################
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License version 2 as
   6 # published by the Free Software Foundation.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11 # GNU General Public License for more details.
  12 #
  13 # Copyright (C) 2016 Eric Luehrsen
  14 #
  15 ##############################################################################
  16 #
  17 # This script facilitates alternate installation of Unbound+odhcpd and no
  18 # need for dnsmasq. There are some limitations, but it works and is small.
  19 # The lease file is parsed to make "zone-data:" and "local-data:" entries.
  20 #
  21 # config odhcpd 'odhcpd'
  22 #   option leasetrigger '/usr/lib/unbound/odhcpd.sh'
  23 #
  24 ##############################################################################
  25
  26 . /lib/functions.sh
  27 . /usr/lib/unbound/defaults.sh
  28
  29 ##############################################################################
  30
  31 odhcpd_zonedata() {
  32   local dhcp_link=$( uci_get unbound.@unbound[0].dhcp_link )
  33   local dhcp4_slaac6=$( uci_get unbound.@unbound[0].dhcp4_slaac6 )
  34   local dhcp_domain=$( uci_get unbound.@unbound[0].domain )
  35   local dhcp_origin=$( uci_get dhcp.@odhcpd[0].leasefile )
  36
  37
  38   if [ -f "$UB_TOTAL_CONF" -a -f "$dhcp_origin" \
  39        -a "$dhcp_link" = "odhcpd" -a -n "$dhcp_domain" ] ; then
  40     local longconf dateconf
  41     local dns_ls_add=$UB_VARDIR/dhcp_dns.add
  42     local dns_ls_del=$UB_VARDIR/dhcp_dns.del
  43     local dns_ls_new=$UB_VARDIR/dhcp_dns.new
  44     local dns_ls_old=$UB_VARDIR/dhcp_dns.old
  45     local dhcp_ls_new=$UB_VARDIR/dhcp_lease.new
  46
  47     # Capture the lease file which could be changing often
  48     sort $dhcp_origin > $dhcp_ls_new
  49
  50
  51     if [ ! -f $UB_DHCP_CONF -o ! -f $dns_ls_old ] ; then
  52       # no old files laying around
  53       longconf=freshstart
  54
  55     else
  56       # incremental at high load or full refresh about each 5 minutes
  57       dateconf=$(( $( date +%s ) - $( date -r $UB_DHCP_CONF +%s ) ))
  58
  59
  60       if [ $dateconf -gt 300 ] ; then
  61         longconf=longtime
  62       else
  63         longconf=increment
  64       fi
  65     fi
  66
  67
  68     case $longconf in
  69     freshstart)
  70       awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
  71           -v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
  72           -v bisolt=0 -v bconf=1 \
  73           -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
  74
  75       cp $dns_ls_new $dns_ls_add
  76       cp $dns_ls_new $dns_ls_old
  77       ;;
  78
  79     longtime)
  80       awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
  81           -v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
  82           -v bisolt=0 -v bconf=1 \
  83           -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
  84
  85       awk '{ print $1 }' $dns_ls_old | sort | uniq > $dns_ls_del
  86       cp $dns_ls_new $dns_ls_add
  87       cp $dns_ls_new $dns_ls_old
  88       ;;
  89
  90     *)
  91       # incremental add and prepare the old list for delete later
  92       # unbound-control can be slow so high DHCP rates cannot run a full list
  93       awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
  94           -v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
  95           -v bisolt=0 -v bconf=0 \
  96           -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
  97
  98       sort $dns_ls_new $dns_ls_old $dns_ls_old | uniq -u > $dns_ls_add
  99       sort $dns_ls_new $dns_ls_old | uniq > $dns_ls_old
 100       ;;
 101     esac
 102
 103
 104     if [ -f "$dns_ls_del" ] ; then
 105       cat $dns_ls_del | $UB_CONTROL_CFG local_datas_remove
 106     fi
 107
 108
 109     if [ -f "$dns_ls_add" ] ; then
 110       cat $dns_ls_add | $UB_CONTROL_CFG local_datas
 111     fi
 112
 113
 114     # prepare next round
 115     rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
 116   fi
 117 }
 118
 119 ##############################################################################
 120
 121 odhcpd_zonedata
 122
 123 ##############################################################################
 124