Dynamic DNS: One script to rule them all

[efaden]

Yeah. Unfortunately there is no simple way to do that on MikroTik.

I did play around with a layer 7 filtering option with routing marks. I believe it would actually work.

Basically what you do is create two layer7 rules… 1 to match requests to http://myip.dnsomatic.com/interface1 and one to match http://myip.dnsomatic.com/interface2 … This will work since actually it doesn’t matter what URL you request from http://myip.dnsomatic.com/ … it always just returns the IP. So then once you have matches on those rules you can create prerouting rules to add routing marks to the packets coming from your router (this way you don’t do Layer7 on all your traffic). With that mark added you could then force the requests to route out the specific interfaces.

Then once all that is setup you could use a modified version of the script I posted… I can modify it for you if you want… to just use fetch on a list of interfaces.

Does all that make sense? If I get a chance tomorrow I can play around with the REGEX, etc for the above and see if I can post some sort of example of what I’m talking about.

-Eric

[sirdir]

efaden sounds pretty plausible to me at least But I’ll have to look into layer 7 filtering etc. never used that before..

Regards
Patrick

[efaden]

@sirdir

efaden sounds pretty plausible to me at least But I’ll have to look into layer 7 filtering etc. never used that before..

Regards
Patrick

Yeah. Me either. Unfortunately there isn’t a simpler way to do this. The problem is that your cannot force fetch to use a specific interface…

[lanham]

FYI: Works with mipsbe but not x86 (6.5npk)

@aldoir

Hi,

I see many scripts for different providers or situations. This script is aimed to work as many situations and providers as possible, no matter if you are behind a NAT or have a public IP. As a plus, you get a “Force update every X days” feature.

If you think this script is useful, I can add other providers as well.

Some snippets of code were taken from existing scripts published in the wiki

#************************************************************************************************
# Parameters
#************************************************************************************************
:local username "<your username>"
:local password "<your password>"
:local hostname "<subdomain.yourprovider.net>"

#availabe options: "http" or "iface"
# - http: will query an external server and discover you public ip (userful for NATted connections)
# - iface: will use the ip address assigned to the $iface interface (see below)

:local discoverBy "iface"

# interface used to get ip address from (only if discoverBy = iface)

:local iface "public-dsl"

# current available services: "dyndns", "noip" and "changeip"
:local service "changeip"

# number of days to force an update if your IP did not change (helps keeping your account active)
:local forceUpdate 15

#************************************************************************************************
# do not change below this unless you know what you are doing
#************************************************************************************************

:local force
:global lastUpdate
:local currentIP

:if ($discoverBy="http") do={ 
   /tool fetch mode=http address="checkip.dyndns.org" src-path="/" dst-path="/dyndns.checkip.html"
   :local result [/file get dyndns.checkip.html contents]
   :local resultLen [:len $result]
   :local startLoc [:find $result ": " -1]
   :set startLoc ($startLoc + 2)
   :local endLoc [:find $result "</body>" -1]
   :set currentIP [:pick $result $startLoc $endLoc]
} else={
   :set currentIP [ /ip address get [find interface=$iface disabled=no] address ]
   :for i from=( [:len $currentIP] - 1) to=0 do={
      :if ( [:pick $currentIP $i] = "/") do={ :set currentIP [:pick $currentIP 0 $i] } 
   }
}

#get IP from DynDNS for our hostname
:local resolvedIP [:resolve $hostname]

# get current date in format mm/DD/YYYY
:local date [ /system clock get date ]

# convert to YYYYMMDD
:local months ("jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec");
:local month [ :pick $date 0 3 ]; :local day [ :pick $date 4 6 ]; :local year [ :pick $date 7 11 ];
:local mm ([ :find $months $month -1 ] + 1);
:if ($mm < 10) do={ :set month ("0" . $mm); } else={ :set month $mm; }
:set date ($year . $month . $day);

:if ([ :typeof $lastUpdate ]=[:nothing] || (($date-$lastUpdate) >= $forceUpdate  && $forceUpdate > 0)) do={ 
   :set force true 
}

:put ("Current IP: $currentIP ($discoverBy), Last update: $lastUpdate")

# Determine if dyndns update is needed
:if (($currentIP != $resolvedIP) || ($force = true)) do={
    
    :if ($service = "dyndns") do={
       /tool fetch user=$username password=$password mode=http address="members.dyndns.org" \
            src-path="/nic/update?hostname=$hostname&myip=$currentIP" dst-path="/output.txt"
    }
    :if ($service = "noip") do={
       /tool fetch user=$username password=$password mode=http address="dynupdate.no-ip.com" \
            src-path="/nic/update?hostname=$hostname&myip=$currentIP" dst-path="/output.txt"
    }
    :if ($service = "changeip") do={
       /tool fetch user=$username password=$password mode=http address="nic.changeip.com" \
            src-path="/nic/update?hostname=$hostname&myip=$currentIP" dst-path="/output.txt"
    }
	
    :local result [/file get output.txt contents]
    :log info ("dynamic-dns-updater: Service = $service, Hostname = $hostname")
    :log info ("dynamic-dns-updater: CurrentIP = $currentIP, Resolved IP = $resolvedIP")
    :log info ("dynamic-dns-updater: Update result: ".$result)
    /ip dns cache flush
    :set lastUpdate $date
}

[lanham]

@aldoir

What is the error?

Run in console (/system script run script-name) and paste the output here pls

Interesting that my script works with above method but does not work when clicking the Run Script button from Winbox.

[aldoir]

Yes, this seems to be a bug in Mikrotik, the script runs well on scheduler but not thru the Run Script button

[RazorMX]

Saludos tengo problemas al correr el script me aparece
failure: dns name does not exist

[yan2x]

this No-Ip script doesn’t work on v6.18
im on NAT pls help me…

[code]# No-IP automatic Dynamic DNS update for RouterOS v6.x

#--------------- Change Values in this section to match your setup ------------------

# No-IP User account info
:local noipuser "USERNAME"
:local noippass "PASSWORD"

# Set the hostname or label of network to be updated.
# Hostnames with spaces are unsupported. Replace the value in the quotations below with your host names.
# To specify multiple hosts, separate them with commas.
:local noiphost "no-ip.org"

# Change to the name of interface that gets the dynamic IP address
:local inetinterface "GATEWAY"

#------------------------------------------------------------------------------------
# No more changes need

:global previousIP

:if ([/interface get $inetinterface value-name=running]) do={
# Get the current IP on the interface
   :local currentIP [/ip address get [find interface="$inetinterface" disabled=no] address]

# Strip the net mask off the IP address
   :for i from=( [:len $currentIP] - 1) to=0 do={
       :if ( [:pick $currentIP $i] = "/") do={ 
           :set currentIP [:pick $currentIP 0 $i]
       } 
   }

# Get your previous IP address
   :set previousIP [:resolve $noiphost]
   
   :if ($currentIP != $previousIP) do={
       :log info "No-IP: Current IP $currentIP is not equal to previous IP $previousIP, update needed"
       :set previousIP $currentIP

# The update URL. Note the "\3F" is hex for question mark (?). Required since ? is a special character in commands.
       :local url "http://dynupdate.no-ip.com/nic/update\3Fmyip=$currentIP"
       :local noiphostarray
       :set noiphostarray [:toarray $noiphost]
       :foreach host in=$noiphostarray do={
           :log info "No-IP: Sending update for $host"
           /tool fetch url=($url . "&hostname=$host") user=$noipuser password=$noippass mode=http keep-result=no;
           :log info "No-IP: Host $host updated on No-IP with IP $currentIP"
       }
   }  else={
       :log info "No-IP: Previous IP $previousIP is equal to current IP, no update needed"
   }
} else={
   :log info "No-IP: $inetinterface is not currently running, so therefore will not update."
}


# --------------------------------------------------------------------------------------

[/code]

[Airell]

@brodie7838

So the question is, is there a way to get the Mikrotik to send

Host:updates.dnsomatic.com

in the header of the request?

I have been running into the same as you did, but two years later… until I read this and I read your communication with OpenDNS. Thank you for sharing this.

It seems you can do that now, add:

host="updates.dnsomatic.com"

to the fetch command, and then it works!

[berisz]

@DogHead

DNS O Matic uses the exact same syntax as DynDNS: http://dnsomatic.com/wiki/api

I added the following to the script:

    :if ($service = "dnsomatic") do={
       /tool fetch user=$username password=$password mode=http address="updates.dnsomatic.com" \
            src-path="/nic/update?hostname=$hostname&myip=$currentIP" dst-path="/output.txt"
    }

and got

status: failed

failure: closing connection: <301 Moved Permanently> 67.215.92.215:80 (4)

in the Terminal output. I assume that’s a HTTP 301 return from “updates.dnsomatic.com”? Any thoughts?

“fetch” “address” replace “url”:

 > /tool fetch mode=http url="http://myip.dnsomatic.com/" src-path="/" dst-path="/output.txt"
 > :put [/file get output.txt contents]

so the query works, probably the update as well!