108 lines
5.8 KiB
Plaintext
108 lines
5.8 KiB
Plaintext
#!rsc by RouterOS
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# RouterOS script: dhcp-to-dns
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# Copyright (c) 2013-2023 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 ($GlobalFunctionsReady != true) do={ :delay 500ms; }
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:global Domain;
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:global Identity;
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:global CharacterReplace;
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:global EitherOr;
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:global IfThenElse;
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:global LogPrintExit2;
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:global ParseKeyValueStore;
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:global ScriptLock;
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$ScriptLock $0 false 10;
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:local Ttl 5m;
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:local CommentPrefix ("managed by " . $0 . " for ");
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:local CommentString ("--- " . $0 . " above ---");
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:if ([ :len [ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ] ] = 0) do={
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/ip/dns/static/add name=$CommentString type=NXDOMAIN disabled=yes;
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$LogPrintExit2 warning $0 ("Added disabled static dns record with name '" . $CommentString . "'.") false;
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}
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:local PlaceBefore ([ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ]->0);
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:foreach DnsRecord in=[ /ip/dns/static/find where comment~("^" . $CommentPrefix) (!type or type=A) ] 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 $DnsRecord;
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/ip/dns/static/remove [ find where type=CNAME comment=($DnsRecordVal->"comment") ];
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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 $Lease ];
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:local DupMacLeases [ /ip/dhcp-server/lease/find where mac-address=($LeaseVal->"mac-address") status=bound ];
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:if ([ :len $DupMacLeases ] > 1) do={
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$LogPrintExit2 debug $0 ("Multiple bound leases found for mac-address " . ($LeaseVal->"mac-address") . ", using last one.") false;
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:set LeaseVal [ /ip/dhcp-server/lease/get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) ];
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}
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} on-error={
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$LogPrintExit2 debug $0 ("A lease just vanished, ignoring.") false;
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}
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:if ([ :len ($LeaseVal->"address") ] > 0) do={
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:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
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:local MacDash [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ];
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:local HostName [ $CharacterReplace [ $EitherOr ([ $ParseKeyValueStore ($LeaseVal->"comment") ]->"hostname") ($LeaseVal->"host-name") ] " " "" ];
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:local Network [ /ip/dhcp-server/network/find where ($LeaseVal->"address") in address ];
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:local NetworkVal;
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:if ([ :len $Network ] > 0) do={
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:set NetworkVal [ /ip/dhcp-server/network/get ($Network->0) ];
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}
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:local NetworkInfo [ $ParseKeyValueStore ($NetworkVal->"comment") ];
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:local NetDomain ([ $IfThenElse ([ :len ($NetworkInfo->"name-extra") ] > 0) ($NetworkInfo->"name-extra" . ".") ] . \
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[ $EitherOr [ $EitherOr ($NetworkInfo->"domain") ($NetworkVal->"domain") ] $Domain ]);
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:local DnsRecord [ /ip/dns/static/find where comment=$Comment (!type or type=A) ];
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:if ([ :len $DnsRecord ] > 0) do={
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:local DnsRecordVal [ /ip/dns/static/get $DnsRecord ];
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:if ($DnsRecordVal->"address" = $LeaseVal->"address" && $DnsRecordVal->"name" = ($MacDash . "." . $NetDomain)) do={
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$LogPrintExit2 debug $0 ("DNS entry for " . $LeaseVal->"mac-address" . " does not need updating.") false;
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} else={
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$LogPrintExit2 info $0 ("Replacing DNS entry for " . $LeaseVal->"mac-address" . " (" . ($MacDash . "." . $NetDomain) . " -> " . $LeaseVal->"address" . ").") false;
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/ip/dns/static/set address=($LeaseVal->"address") name=($MacDash . "." . $NetDomain) $DnsRecord;
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}
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:local Cname [ /ip/dns/static/find where comment=$Comment type=CNAME ];
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:if ([ :len $Cname ] = 0 && [ :len $HostName ] > 0) do={
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$LogPrintExit2 info $0 ("Host name appeared, adding CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
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/ip/dns/static/add name=($HostName . "." . $NetDomain) type=CNAME cname=($MacDash . "." . $NetDomain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
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}
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:if ([ :len $Cname ] > 0 && [ /ip/dns/static/get $Cname name ] != ($HostName . "." . $NetDomain)) do={
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$LogPrintExit2 info $0 ("Host name or domain changed, updating CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
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/ip/dns/static/set name=($HostName . "." . $NetDomain) cname=($MacDash . "." . $NetDomain) $Cname;
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}
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} else={
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$LogPrintExit2 info $0 ("Adding new DNS entry for " . $LeaseVal->"mac-address" . " (" . ($MacDash . "." . $NetDomain) . " -> " . $LeaseVal->"address" . ").") false;
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/ip/dns/static/add name=($MacDash . "." . $NetDomain) type=A address=($LeaseVal->"address") ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
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:if ([ :len $HostName ] > 0) do={
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$LogPrintExit2 info $0 ("Adding new CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
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/ip/dns/static/add name=($HostName . "." . $NetDomain) type=CNAME cname=($MacDash . "." . $NetDomain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
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}
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}
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} else={
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$LogPrintExit2 debug $0 ("No address available... Ignoring.") false;
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}
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}
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