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  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. # Common file location definitions
  26. . /usr/lib/unbound/unbound.sh
  27. ##############################################################################
  28. odhcpd_settings() {
  29. # This trigger is out of normal init context, so we need to read some UCI.
  30. local cfg="$1"
  31. config_get UNBOUND_D_DHCP_LINK "$cfg" dhcp_link none
  32. config_get_bool UNBOUND_B_SLAAC6_MAC "$cfg" dhcp4_slaac6 0
  33. config_get UNBOUND_TXT_DOMAIN "$cfg" domain lan
  34. }
  35. ##############################################################################
  36. odhcpd_zonedata() {
  37. local dns_ls_add=$UNBOUND_VARDIR/dhcp_dns.add
  38. local dns_ls_del=$UNBOUND_VARDIR/dhcp_dns.del
  39. local dhcp_ls_new=$UNBOUND_VARDIR/dhcp_lease.new
  40. local dhcp_ls_old=$UNBOUND_VARDIR/dhcp_lease.old
  41. local dhcp_ls_add=$UNBOUND_VARDIR/dhcp_lease.add
  42. local dhcp_ls_del=$UNBOUND_VARDIR/dhcp_lease.del
  43. local dhcp_origin=$( uci get dhcp.@odhcpd[0].leasefile )
  44. config_load unbound
  45. config_foreach odhcpd_settings unbound
  46. if [ "$UNBOUND_D_DHCP_LINK" = "odhcpd" -a -f "$dhcp_origin" ] ; then
  47. # Capture the lease file which could be changing often
  48. cat $dhcp_origin | sort > $dhcp_ls_new
  49. touch $dhcp_ls_old
  50. sort $dhcp_ls_new $dhcp_ls_old $dhcp_ls_old | uniq -u > $dhcp_ls_add
  51. sort $dhcp_ls_old $dhcp_ls_new $dhcp_ls_new | uniq -u > $dhcp_ls_del
  52. # Go through the messy business of coding up A, AAAA, and PTR records
  53. # This static conf will be available if Unbound restarts asynchronously
  54. awk -v hostfile=$UNBOUND_DHCP_CONF -v domain=$UNBOUND_TXT_DOMAIN \
  55. -v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=1 \
  56. -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
  57. # Deleting and adding all records into Unbound can be a burden in a
  58. # high density environment. Use unbound-control incrementally.
  59. awk -v hostfile=$dns_ls_del -v domain=$UNBOUND_TXT_DOMAIN \
  60. -v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=0 \
  61. -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_del
  62. awk -v hostfile=$dns_ls_add -v domain=$UNBOUND_TXT_DOMAIN \
  63. -v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=0 \
  64. -f /usr/lib/unbound/odhcpd.awk $dhcp_ls_add
  65. if [ -f "$dns_ls_del" ] ; then
  66. cat $dns_ls_del | $UNBOUND_CONTROL_CFG local_datas_remove
  67. fi
  68. if [ -f "$dns_ls_add" ] ; then
  69. cat $dns_ls_add | $UNBOUND_CONTROL_CFG local_datas
  70. fi
  71. # prepare next round
  72. mv $dhcp_ls_new $dhcp_ls_old
  73. rm -f $dns_ls_del $dns_ls_add $dhcp_ls_del $dhcp_ls_add
  74. fi
  75. }
  76. ##############################################################################
  77. odhcpd_zonedata
  78. ##############################################################################