#!rsc
# RouterOS script: ipv6-update
# Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
#
# update firewall and dns settings on IPv6 prefix change
# https://git.eworm.de/cgit/routeros-scripts/about/doc/ipv6-update.md

:local PdPrefix $"pd-prefix";

:global LogPrintExit;
:global ParseKeyValueStore;

:if ([ :typeof $PdPrefix ] = "nothing") do={
  $LogPrintExit error "This script is supposed to run from ipv6 dhcp-client." true;
}

:local Pool [ / ipv6 pool get [ find where prefix=$PdPrefix ] name ];
:local AddrList [ / ipv6 firewall address-list find where comment=("ipv6-pool-" . $Pool) ];
:local OldPrefix [ / ipv6 firewall address-list get $AddrList address ];

# give the interfaces a moment to receive their addresses
:delay 2s;

if ($OldPrefix != $PdPrefix) do={
  :log info ("Updating IPv6 address list with new IPv6 prefix " . $PdPrefix);
  / ipv6 firewall address-list set address=$PdPrefix $AddrList;

  :foreach Record in=[ / ip dns static find where comment~("^ipv6-pool-" . $Pool . ",") ] do={
    :local RecordVal [ / ip dns static get $Record ];
    :local Comment [ $ParseKeyValueStore ($RecordVal->"comment") ];

    :local Prefix [ / ipv6 address get [ find where interface=($Comment->"interface") from-pool=$Pool global ] address ];
    :set Prefix [ :toip6 [ :pick $Prefix 0 [ :find $Prefix "/64" ] ] ];
    :local Address ($Prefix | ([ :toip6 ($RecordVal->"address") ] & ::ffff:ffff:ffff:ffff));

    :log info ("Updating DNS record for " . ($RecordVal->"name") . ($RecordVal->"regexp") . " to " . $Address);
    / ip dns static set address=$Address $Record;
  }
}