Mikrotik DDNS on Cloudflare

README.md

Setup

• create a script (System->scripts) with the content of Mikrotik_DDNS_CF.script

  • replace: <WAN-INTERFACE>, <TOKEN>, <DNS ZONE>, <DOMAIN>, <DOMAIN-ID>
  • permissions: read,write,policy,test

• create a schedule (System->schedulers) pointing On Event to your script

  • set preferred schedule time (i.e every 5 min)
  • permissions: read,write,policy,test

Mikrotik_DDNS_CF.script

################# Config variables #################
:global WANInterface;

################# CloudFlare variables #################
:local CFtkn "<TOKEN>"; # Your CloudFlare API token comes here

:local CFrecordType "A";
:local CFzoneid "<DNS ZONE>"; # Your DNS zone ID comes here (a hash of 32 chars)

# An associative array of domain names to domainIds (32 chars each, you'll need to query CF to get them)
:local CFdomains { "<DOMAIN>"="<DOMAIN-ID>" };
# An associative array of domain names to whether you want to enable CF proxying or not
:local CFproxied { "<DOMAIN>"="false" };

#########################################################################
########################  DO NOT EDIT BELOW  ############################
#########################################################################

:global ddnslastipCF;
:local ddnsipWAN; 

:if ([:typeof $WANInterface]~"(nothing|nil)") do={
  :local result [/tool fetch url=https://ifconfig.co http-method=get mode=https as-value output=user];
  :if ($result->"status" = "finished") do={
    :local ip ($result->"data");
    :set ddnsipWAN [:pick $ip 0 [:find $ip "\n"]];
  }
} else={
  :local result [/ip address find actual-interface=$WANInterface];
  :if ([:len $result] > 0) do={
    :local ip [/ip address get $result address];
    :set ddnsipWAN [:pick $ip 0 [:find $ip "/"]];
  }
}

:if ([:typeof $ddnslastipCF]~"(nothing|nil)" ) do={ :set ddnslastipCF 0.0.0.0; } else={ :set ddnslastipCF $ddnslastipCF; }

:if ([:typeof $ddnsipWAN]~"(nothing|nil)" ) do={
  :log error ("DDNS-Update: Unable to get public ip, please check.");
} else={
  :if ($ddnsipWAN != $ddnslastipCF) do={
    :log warn ("DDNS-Update use IP: ".$ddnslastipCF." -> ".$ddnsipWAN);
    :foreach domainName,domainId in=$CFdomains do={
      :local proxied ($CFproxied->$domainName);
      :local url "https://api.cloudflare.com/client/v4/zones/$CFzoneid/dns_records/$domainId";
      :local header "Authorization: Bearer $CFtkn,content-type:application/json";
      :local data "{\"type\":\"$CFrecordType\",\"name\":\"$domainName\",\"content\":\"$ddnsipWAN\",\"proxied\":$proxied,\"ttl\":120}";
      :local result [/tool fetch http-method=put mode=https url=$url http-header-field=$header http-data=$data as-value output=user];
      :if ($result->"status" = "finished") do={
          :set ddnslastipCF $ddnsipWAN;
          :log info ("DDNS-Update IP " . $ddnsipWAN . " Success");
      } else={
          :log error ("DDNS-Update Error ".$result->status);
      }
    };
  } else={
    :log debug "DDNS-Update: IP No Change";
  }
}