Revision as of 18:22, 29 November 2009

Info

There are two scripts available to use. One is for ChangeIP.com or MyDDns.com, and the other for EveryDNS. Once created you should schedule this to run once in a while.

The ChangeIP.com and MyDDNS.com Script

The :local variables should be edited to include your unique username and password, interface name, etc. The script here should allow auto-detection of the default gateways interface name. This script below can be used if you have more than 1 WAN connection, but only 1 is active at a time.

This script will work as is, just navigate to System/Scripts and run it. This particular script works good with a 5 minute interval to update your Dynamic DNS with a scheduler.

Setup

For this script to function correctly, there are a few things that will need to be setup. Not necessary, but always good to have in place.

• Routerboard Identity Setup rb_Identity
• Routerboard Time Setup, either manually rb_time_manual or via NTP rb_ntp_setup

Enhancements

• Check out Dynamic DNS Schedule to create a schedule, that will run the script at a predefined period.

Script

# MyDDns International Account

# Local user variables
:local DnsUser "enter your MyDDns username here"
:local DnsPass "enter your MyDDns password here"
:local DnsHost "enter your MyDDns hostname here"
:local DnsInterface "enter your PPPoE interface name here"

# Global user variables
# if you have another PPPoE account with this script you need to change LastDnsIpInter to something unique; search/replace
:global LastDnsIpInter

:if ([ :typeof $LastDnsIpInter ] = nil) do={ :global LastDnsIpInter "0"}

# Get the current Ip Address
:local DnsIp [/ip address get [/ip address find interface=$DnsInterface] address ]

# Check for updates
:if ([ :typeof $DnsIp ] = nil ) do={
  :log info ("DynDns: No Ip address present on ". $DnsInterface )
} else={
  :local NewIp [ :pick $DnsIp 0 [ :find $DnsIp "/" ] ]  
  :if ($NewIp != $LastDnsIpInter) do={
    :log info ("DynDns: ". $DnsInterface ." Sending update.")
    :local DnsResult ( [ :put [ /tool dns-update name=$DnsHost address=$NewIp key-name=$DnsUser key=$DnsPass ] ] )
    :global LastDnsIpInter $NewIp
  } else={
# Uncomment the line below if you want to see when updates aren't needed  
#    :log info "DynDns: ($DnsInterface) No update needed"
  }
}

The EveryDNS.com Script

Change all the local variables at the top of the script to your relevant EveryDNS account. This script can work with multiple interfaces. You need to setup a script for every interface. Change the edlastip1 global variable to edlastip2 for the second script, and edlastip3 for the third script etc.

# Define user variables
# Please NOTE that your username and password will be sent cleartext across the internet!
:local eduser "enter your EveryDNS username here"
:local edpass "enter your EveryDNS password here"
:local eddomain "enter your full qualifying domain here"
:local edinterface "enter the interface which you want to grab the IP from"

# Change this global variable if you want more than 1 script
:global edlastip1
:local str
:local edip
:local ip

:if ([ :typeof $edlastip1 ] = nil ) do={ :global edlastip1 "0" }

:local edip [ /ip address get [/ip address find interface=$edinterface ] address ]

:if ([ :typeof $edip ] = nil ) do={
   :log info ("EveryDNS: No ip address on $edinterface .")
} else={

# strip off netmask correctly (MRz)
   :for i from=( [:len $edip] - 1) to=0 do={
      :if ( [:pick $edip $i] = "/") do={
	   :set edip [:pick $edip 0 $i];
      }
   }

  :if ($edip != $edlastip1) do={

    :log info ("EveryDNS: $eddomain -> $edip")
# use url directly and mode http (MRz)
    :local str "/index.php?ver=0.1&ip=$edip&domain=$eddomain"
    /tool fetch url="http://dyn.everydns.net/$str" mode=http user=$eduser password=$edpass dst-path=("/EveryDNS.".$eddomain)
    :delay 1

# output any error messages received from file
    :local str [/file find name="EveryDNS.$eddomain"];
    :log info [/file get $str contents];
    /file remove $str
    :global edlastip1 $edip
  }
}

Add a schedule to run this script every minute. It will only update the IP if it differs with the current domain IP.