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crx-scrpt_dyndns_dual-wan.rsc

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+# COREX MIKROTIK DynDNS update script for dual WAN
+# VERSION 1.0 - BUILT ON 2023.02.26.
+#
+# for more information check GitHub:
+# https://github.com/bgabika/mikrotik_dyndns_for_dual_wan
+#
+# Test it in test environment to stay safe and sensible before 
+# using in production!
+# For bugs and feature requests mailto bg@corex.bg
+############################################################
+
+:global IspDictionary ({"primary-ISP.getmyip.com"="digi"; \ 
+						"backup-ISP.getmyip.com"="ether1"})
+
+:global ddnsuser "my_dyndns_user"
+:global ddnspass "my_dyndns_token"
+
+:global DynDnsFqdnPriority
+:global IspInterfacePriority
+:foreach mykey,myvalue in=$IspDictionary do={ :set $DynDnsFqdnPriority ($DynDnsFqdnPriority, $mykey); :set $IspInterfacePriority ($IspInterfacePriority, $myvalue) }
+
+:global IspDistances ({})
+
+
+:foreach interface in=$IspInterfacePriority \ 
+	do={ \
+	:global distance [ip route get [find where dst-address=0.0.0.0/0 and vrf-interface=$interface] distance ];
+	:set ($IspDistances->"$interface") $distance
+	}
+
+
+:local interfacefunction \ 
+	do={ \
+		:global ddnsuser;
+		:global ddnspass;
+		:global IspInterfacePriority;
+		:global DynDnsFqdnPriority;
+		:global IspInterface [:pick $IspInterfacePriority $interfaceindex]; \ 
+		:global DynDnsFqdn [:pick $DynDnsFqdnPriority $fqdnindex]; \ 
+		:global IspIpActive [:resolve $DynDnsFqdn]; \ 
+		:global IspIpFresh [ /ip address get [/ip address find interface=$IspInterface ] address ]; \ 
+
+		:if ([ :typeof $IspIpFresh ] = nil ) \ 
+		do={
+			:log warning ("COREX-DNS: No ip address on $IspInterface .")
+			} \ 
+		else={
+			:for i from=( [:len $IspIpFresh] - 1) to=0 \ 
+			do={ 
+				:if ( [:pick $IspIpFresh $i] = "/") \ 
+					do={ 
+					:set IspIpFresh [:pick $IspIpFresh 0 $i];
+					   } 
+			   }
+			}
+
+
+		:if ($IspIpActive != $IspIpFresh) \ 
+			do={
+				:log warning ("COREX-DNS: Old IP address = $IspIpActive")
+				:log warning ("COREX-DNS: Fresh IP address = $IspIpFresh")
+				:log warning "COREX-DNS: Update IP needed, Sending UPDATE...!"
+				:global str "/nic/update\?hostname=$DynDnsFqdn&myip=$IspIpFresh&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG"
+				/tool fetch address=members.dyndns.org src-path=$str mode=http user=$ddnsuser \
+				password=$ddnspass dst-path=("/DynDNS.".$DynDnsFqdn)
+				:delay 1
+				:global str [/file find name="DynDNS.$DynDnsFqdn"];
+				/file remove $str
+				:global IspIpActive $IspIpFresh
+				:log warning "COREX-DNS: $DynDnsFqdn IP updated to $IspIpFresh!"
+			} \ 
+			else={
+				:log warning "COREX-DNS:  $DynDnsFqdn dont need changes";
+				}
+
+		}
+
+
+if ([:pick $IspDistances 0] < [:pick $IspDistances 1]) \ 
+	do={ \ 
+		:log warning ("Primary ISP: ".[:pick $IspInterfacePriority 0])
+		$interfacefunction interfaceindex=0 fqdnindex=0 \ 
+		:delay 1
+		$interfacefunction interfaceindex=1 fqdnindex=1 \ 
+
+		} \ 
+
+	else={ \ 
+		:log warning ("Primary ISP: ".[:pick $IspInterfacePriority 1])
+		$interfacefunction interfaceindex=1 fqdnindex=0 \ 
+		:delay 1
+		$interfacefunction interfaceindex=0 fqdnindex=1 \ 
+
+		}
+

readme.md

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+
+# crx-scrpt_dyndns_dual-wan
+
+COREX MIKROTIK DynDNS update script for dual WAN, v1.0
+
+### Features
+ - check Mikrotik multi ISP's interfaces and update DynDNS records.
+ - script is created to check mikrotik device with dual WAN interface and for router access on the backup interface but from main fqdn.
+ - script is working on router OS 7.7 and above.
+ - IP address update procedure is based on interface distance. 
+ - Example to understand backend operation:
+	:global IspDictionary ({"primary-ISP.getmyip.com"="digi"; \ 
+						"backup-ISP.getmyip.com"="ether1"})
+
+	Router can be accessed on primary-ISP.getmyip.com fqdn on the interface named "digi" as primary ISP.
+	Router has a backup ISP on backup-ISP.getmyip.com fqdn on the interface named "ether1".
+	In this case "digi" interface has lower distance then "ether1" interface.
+
+	Script will check "digi" interface's ip address and will update primary-ISP.getmyip.com address in your DynDNS account.
+
+	When "digi" interface is down, backup ISP's "ether1' interface will be active on the router.
+	In this case the script will update my-primary.getmyip.com fqdn with "ether1" ip address, so your router can be accessed on the backup ISP's interface on the main fqdn.
+
+	IMPORTANT!!!! 
+	This script does not change any value in your router. 
+	This script gets IP address information from router interfaces only and put them into dyndns account.
+	Active and backup ISP changes must be solved from other source.
+
+
+### Usage
+
+<pre><code>
+# USAGE:
+# - edit crx-scrpt_dyndns_dual-wan.rsc file: ddnsuser and ddnspass for DynDNS connection
+# 	edit IspDictionary dictionary, first key is the primary FQDN, first value is the primary ISP's interface name.
+#   Second key and value are the backup ISP's details.
+# - copy modified crx-scrpt_dyndns_dual-wan.rsc file on the MIKROTIK device.
+# - Create task scheduler to trigger the script in every 5 minutes:
+# 	/system scheduler add interval=00:05:00 name=COREX_DynDNS_update on-event="import crx-scrpt_dyndns_dual-wan.rsc"
+# - For output check mikrotik log, Example output:
+# 	Primary ISP: digi
+# 	COREX-DNS:  primary-ISP.getmyip.com dont need changes
+# 	COREX-DNS:  backup-ISP.getmyip.com dont need changes
+#	...
+#	Primary ISP: ether1-NET
+#	COREX-DNS: Old IP address = 44.119.19.71
+#	COREX-DNS: Fresh IP address = 192.168.30.118
+#	COREX-DNS: Update IP needed, Sending UPDATE...!
+#	COREX-DNS: primary-ISP.getmyip.com IP updated to 192.168.30.118!
+#	...
+#	COREX-DNS: Old IP address = 88.133.199.155
+#	COREX-DNS: Fresh IP address = 192.168.31.109
+#	COREX-DNS: Update IP needed, Sending UPDATE...!
+#	COREX-DNS: backup-ISP.getmyip.com IP updated to 192.168.31.109!
+
+</code></pre>
+
+
+
+### Version
+
+ - v1.0
+
+### ToDo
+
+ - waiting for bugs or feature requests (-:
+
+## Changelog
+
+ - [initial release] version 1.0
+