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#!rsc by RouterOS
# RouterOS script: dhcp-to-dns
# Copyright (c) 2013-2021 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# check DHCP leases and add/remove/update DNS entries
# https://git.eworm.de/cgit/routeros-scripts/about/doc/dhcp-to-dns.md
:local 0 "dhcp-to-dns";
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
:global Domain;
:global HostNameInZone;
:global Identity;
:global PrefixInZone;
:global ServerNameInZone;
:global CharacterReplace;
:global IfThenElse;
:global LogPrintExit2;
:local Zone \
([ $IfThenElse ($PrefixInZone = true) "dhcp." ] . \
[ $IfThenElse ($HostNameInZone = true) ($Identity . ".") ] . $Domain);
:local Ttl 5m;
:local CommentPrefix ("managed by " . $0 . " for ");
:local CommentString ("--- " . $0 . " above ---");
:if ([ :len [ / ip dns static find where comment=$CommentString name=- type=NXDOMAIN disabled ] ] = 0) do={
/ ip dns static add comment=$CommentString name=- type=NXDOMAIN disabled=yes;
$LogPrintExit2 warning $0 ("Added disabled static dns record with comment '" . $CommentString . "'.") false;
}
:local PlaceBefore ([ / ip dns static find where comment=$CommentString name=- type=NXDOMAIN disabled ]->0);
:foreach DnsRecord in=[ / ip dns static find where comment ~ $CommentPrefix ] do={
:local DnsRecordVal [ / ip dns static get $DnsRecord ];
:local MacAddress [ $CharacterReplace ($DnsRecordVal->"comment") $CommentPrefix "" ];
:if ([ :len [ / ip dhcp-server lease find where mac-address=$MacAddress address=($DnsRecordVal->"address") status=bound ] ] > 0) do={
$LogPrintExit2 debug $0 ("Lease for " . $MacAddress . " (" . $DnsRecordVal->"name" . ") still exists. Not deleting DNS entry.") false;
} else={
:local Found false;
$LogPrintExit2 info $0 ("Lease expired for " . $MacAddress . " (" . $DnsRecordVal->"name" . "), deleting DNS entry.") false;
/ ip dns static remove $DnsRecord;
}
}
:foreach Lease in=[ / ip dhcp-server lease find where status=bound ] do={
:local LeaseVal [ / ip dhcp-server lease get $Lease ];
:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
:local HostName [ $IfThenElse ([ :len ($LeaseVal->"host-name") ] = 0) \
[ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ] \
[ $CharacterReplace ($LeaseVal->"host-name") " " "" ] ];
:local Fqdn ($HostName . "." . [ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone);
:local DnsRecord [ / ip dns static find where name=$Fqdn ];
:if ([ :len $DnsRecord ] > 0) do={
:local DnsIp [ / ip dns static get $DnsRecord address ];
:local DupMacLeases [ / ip dhcp-server lease find where mac-address=($LeaseVal->"mac-address") status=bound ];
:if ([ :len $DupMacLeases ] > 1) do={
:set ($LeaseVal->"address") [ / ip dhcp-server lease get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) address ];
}
:if ([ :len ($LeaseVal->"host-name") ] > 0) do={
:set ($LeaseVal->"address") [ / ip dhcp-server lease get ([ find where host-name=($LeaseVal->"host-name") status=bound ]->0) address ];
}
:if ($DnsIp = $LeaseVal->"address") do={
$LogPrintExit2 debug $0 ("DNS entry for " . $Fqdn . " does not need updating.") false;
} else={
$LogPrintExit2 info $0 ("Replacing DNS entry for " . $Fqdn . ", new address is " . $LeaseVal->"address" . ".") false;
/ ip dns static set name=$Fqdn address=($LeaseVal->"address") ttl=$Ttl comment=$Comment $DnsRecord;
}
} else={
$LogPrintExit2 info $0 ("Adding new DNS entry for " . $Fqdn . ", address is " . $LeaseVal->"address" . ".") false;
/ ip dns static add name=$Fqdn address=($LeaseVal->"address") ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
}
}
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