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69 lines
2.9 KiB
Plaintext
69 lines
2.9 KiB
Plaintext
#!rsc
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# RouterOS script: dhcp-to-dns
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# Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
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#
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# check DHCP leases and add/remove/update DNS entries
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# https://git.eworm.de/cgit/routeros-scripts/about/doc/dhcp-to-dns.md
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:global Domain;
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:global HostNameInZone;
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:global Identity;
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:global CharacterReplace;
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:global LogPrintExit;
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:local Zone;
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:if ($HostNameInZone = true) do={
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:set Zone ("dhcp." . $Identity . "." . $Domain);
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} else={
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:set Zone ("dhcp." . $Domain);
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}
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:local Ttl 5m;
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:local CommentPrefix "managed by dhcp-to-dns for ";
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:foreach DnsRecord in=[ / ip dns static find where comment ~ $CommentPrefix ] do={
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:local DnsRecordVal [ / ip dns static get $DnsRecord ];
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:local MacAddress [ $CharacterReplace ($DnsRecordVal->"comment") $CommentPrefix "" ];
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:if ([ / ip dhcp-server lease print count-only where mac-address=$MacAddress address=($DnsRecordVal->"address") dynamic=yes status=bound ] > 0) do={
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$LogPrintExit debug ("Lease for " . $MacAddress . " (" . $DnsRecordVal->"name" . ") still exists. Not deleting DNS entry.") false;
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} else={
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:local Found false;
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$LogPrintExit info ("Lease expired for " . $MacAddress . " (" . $DnsRecordVal->"name" . "), deleting DNS entry.") false;
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/ ip dns static remove $DnsRecord;
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}
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}
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:foreach Lease in=[ / ip dhcp-server lease find where dynamic=yes status=bound ] do={
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:local LeaseVal [ / ip dhcp-server lease get $Lease ];
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:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
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:local HostName [ $CharacterReplace ($LeaseVal->"host-name") " " "" ];
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:if ($HostName = "") do={
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:set HostName [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ];
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}
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:local Fqdn ($HostName . "." . $Zone);
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:local DnsRecord [ / ip dns static find where name=$Fqdn ];
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:if ([ :len $DnsRecord ] > 0) do={
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:local DnsIp [ / ip dns static get $DnsRecord address ];
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:local DupMacLeases [ / ip dhcp-server lease find where mac-address=($LeaseVal->"mac-address") dynamic=yes status=bound ];
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:if ([ :len $DupMacLeases ] > 1) do={
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:set ($LeaseVal->"address") [ / ip dhcp-server lease get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) address ];
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}
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:if ([ :len ($LeaseVal->"host-name") ] > 0) do={
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:set ($LeaseVal->"address") [ / ip dhcp-server lease get ([ find where host-name=($LeaseVal->"host-name") dynamic=yes status=bound ]->0) address ];
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}
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:if ($DnsIp = $LeaseVal->"address") do={
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$LogPrintExit debug ("DNS entry for " . $Fqdn . " does not need updating.") false;
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} else={
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$LogPrintExit info ("Replacing DNS entry for " . $Fqdn . ", new address is " . $LeaseVal->"address" . ".") false;
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/ ip dns static set name=$Fqdn address=($LeaseVal->"address") ttl=$Ttl comment=$Comment $DnsRecord;
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}
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} else={
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$LogPrintExit info ("Adding new DNS entry for " . $Fqdn . ", address is " . $LeaseVal->"address" . ".") false;
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/ ip dns static add name=$Fqdn address=($LeaseVal->"address") ttl=$Ttl comment=$Comment;
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}
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}
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