96 lines
4.1 KiB
Plaintext
96 lines
4.1 KiB
Plaintext
#!rsc by RouterOS
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# RouterOS script: dhcp-to-dns
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# Copyright (c) 2013-2021 Christian Hesse <mail@eworm.de>
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# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
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#
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# provides: lease-script, order=20
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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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:local 0 "dhcp-to-dns";
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:global GlobalFunctionsReady;
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:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
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:global Domain;
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:global HostNameInZone;
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:global Identity;
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:global PrefixInZone;
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:global ServerNameInZone;
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:global CharacterReplace;
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:global IfThenElse;
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:global LogPrintExit2;
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:global ScriptLock;
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$ScriptLock $0 false 10;
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:local Zone \
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([ $IfThenElse ($PrefixInZone = true) "dhcp." ] . \
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[ $IfThenElse ($HostNameInZone = true) ($Identity . ".") ] . $Domain);
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:local Ttl 5m;
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:local CommentPrefix ("managed by " . $0 . " for ");
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:local CommentString ("--- " . $0 . " above ---");
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:if ([ :len [ / ip dns static find where comment=$CommentString name=- type=NXDOMAIN disabled ] ] = 0) do={
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/ ip dns static add comment=$CommentString name=- type=NXDOMAIN disabled=yes;
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$LogPrintExit2 warning $0 ("Added disabled static dns record with comment '" . $CommentString . "'.") false;
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}
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:local PlaceBefore ([ / ip dns static find where comment=$CommentString name=- type=NXDOMAIN disabled ]->0);
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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") $CommentPrefix "" ];
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:if ([ :len [ / ip dhcp-server lease find where mac-address=$MacAddress address=($DnsRecordVal->"address") status=bound ] ] > 0) do={
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$LogPrintExit2 debug $0 ("Lease for " . $MacAddress . " (" . $DnsRecordVal->"name" . ") still exists. Not deleting DNS entry.") false;
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} else={
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:local Found false;
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$LogPrintExit2 info $0 ("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 status=bound ] do={
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:local LeaseVal;
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:do {
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:set LeaseVal [ / ip dhcp-server lease get $Lease ];
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} on-error={
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$LogPrintExit2 debug $0 ("A lease just vanished, ignoring.") false;
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}
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:if ([ :typeof $LeaseVal ] = "array") do={
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:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
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:local HostName [ $IfThenElse ([ :len ($LeaseVal->"host-name") ] = 0) \
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[ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ] \
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[ $CharacterReplace ($LeaseVal->"host-name") " " "" ] ];
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:local Fqdn ($HostName . "." . [ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone);
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:local DnsRecord [ / ip dns static find where name=$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") 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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:local HostNameLeases [ / ip dhcp-server lease find where host-name=($LeaseVal->"host-name") status=bound ];
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:if ([ :len $HostNameLeases ] > 1) do={
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:set ($LeaseVal->"address") [ / ip dhcp-server lease get ($HostNameLeases->0) address ];
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}
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}
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:if ($DnsIp = $LeaseVal->"address") do={
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$LogPrintExit2 debug $0 ("DNS entry for " . $Fqdn . " does not need updating.") false;
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} else={
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$LogPrintExit2 info $0 ("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 $DnsRecord;
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}
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} else={
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$LogPrintExit2 info $0 ("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=$Comment place-before=$PlaceBefore;
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}
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}
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}
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