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#!rsc by RouterOS
# RouterOS script: update-tunnelbroker
# Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
#                         Michael Gisbers <michael@gisbers.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# update local address of tunnelbroker interface
# https://git.eworm.de/cgit/routeros-scripts/about/doc/update-tunnelbroker.md

:global CertificateAvailable;
:global LogPrintExit;
:global ParseKeyValueStore;

:if ([ / ip cloud get ddns-enabled ] != true) do={
  $LogPrintExit error "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={
      $LogPrintExit error ("Downloading required certificate failed.") true;
    }
    $LogPrintExit info ("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;
    / interface 6to4 set $Interface local-address=$PublicAddress;
  } else={
    $LogPrintExit debug ("All tunnelbroker configuration is up to date for interface " . $InterfaceVal->"name" . ".") false;
  }
}