update-gre-address


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#
# RouterOS script: update-gre-address
# Copyright (c) 2013-2018 Christian Hesse <mail@eworm.de>
#
# update gre interface remote address with dynamic address from
# ipsec remote peer

:global "gre-cert-prefix";
:global "gre-int-prefix";

/ interface gre set remote-address=0.0.0.0 disabled=yes [ find where !running !disabled ];

:foreach peer in=[ / ip ipsec remote-peers find ] do={
  :local id [ / ip ipsec remote-peers get $peer id ];

  :if ([ :pick $id 0 [ :len $"gre-cert-prefix" ] ] = $"gre-cert-prefix") do={
    :local name [ :pick $id [ :len $"gre-cert-prefix" ] [ :len $id ] ];
    :local addrnew [ / ip ipsec remote-peers get $peer dynamic-address ];
    :local grename ($"gre-int-prefix" . $name);
    :local greint [ / interface gre find where name=$grename ];
    :if ([ :len $greint ] > 0) do={
      :local addrold [ / interface gre get $greint remote-address ];
      :local disabled [ / interface gre get $greint disabled ];
      :if ($addrnew != $addrold || $disabled = true) do={
        :log info ("Update remote address for interface " . $grename . " to " . $addrnew);
        / interface gre set remote-address=0.0.0.0 disabled=yes [ find where remote-address=$addrnew name!=$grename ];
        / interface gre set $greint remote-address=$addrnew disabled=no;
      }
    }
  }
}