#!rsc by RouterOS
# RouterOS script: update-tunnelbroker
# Copyright (c) 2013-2022 Christian Hesse <mail@eworm.de>
#                         Michael Gisbers <michael@gisbers.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# provides: ppp-on-up
#
# update local address of tunnelbroker interface
# https://git.eworm.de/cgit/routeros-scripts/about/doc/update-tunnelbroker.md

:local 0 "update-tunnelbroker";
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }

:global CertificateAvailable;
:global LogPrintExit2;
:global ParseKeyValueStore;

:if ([ /ip/cloud/get ddns-enabled ] != true) do={
  $LogPrintExit2 error $0 ("IP cloud DDNS is not enabled.") true;
}

# Get the current ip address from cloud
/ip/cloud/force-update;
:while ([ /ip/cloud/get status ] != "updated") do={
  :delay 1s;
}
:local PublicAddress [ /ip/cloud/get public-address ];

:foreach Interface in=[ /interface/6to4/find where comment~"^tunnelbroker" !disabled ] do={
  :local InterfaceVal [ /interface/6to4/get $Interface ];

  :if ($PublicAddress != $InterfaceVal->"local-address") do={
    :local Comment [ $ParseKeyValueStore ($InterfaceVal->"comment") ];

    :if ([ $CertificateAvailable "Starfield Secure Certificate Authority - G2" ] = false) do={
      $LogPrintExit2 error $0 ("Downloading required certificate failed.") true;
    }
    $LogPrintExit2 info $0 ("Local address changed, sending UPDATE to tunnelbroker! New address: " . $PublicAddress) false;
    /tool/fetch check-certificate=yes-without-crl \
        ("https://ipv4.tunnelbroker.net/nic/update\?hostname=" . $Comment->"id") \
        user=($Comment->"user") password=($Comment->"pass") output=none as-value;
    /interface/6to4/set $Interface local-address=$PublicAddress;
  } else={
    $LogPrintExit2 debug $0 ("All tunnelbroker configuration is up to date for interface " . $InterfaceVal->"name" . ".") false;
  }
}