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#!rsc by RouterOS
# RouterOS script: dhcp-to-dns
# Copyright (c) 2013-2023 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# provides: lease-script, order=20
#
# 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;
:global ScriptLock;
$ScriptLock $0 false 10;
:local Zone \
([ $IfThenElse ($PrefixInZone = true) "dhcp." ] . \
[ $IfThenElse ($HostNameInZone = true) ($Identity . ".") ] . $Domain);
:local Ttl 5m;
:local CommentPrefix ("managed by " . $0 . " for ");
:local CommentString ("--- " . $0 . " above ---");
:if ([ :len [ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ] ] = 0) do={
/ip/dns/static/add name=$CommentString type=NXDOMAIN disabled=yes;
$LogPrintExit2 warning $0 ("Added disabled static dns record with name '" . $CommentString . "'.") false;
}
:local PlaceBefore ([ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ]->0);
:foreach DnsRecord in=[ /ip/dns/static/find where comment~("^" . $CommentPrefix) !(type=CNAME) ] 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 $DnsRecord;
/ip/dns/static/remove [ find where type=CNAME cname=($DnsRecordVal->"name") comment=($DnsRecordVal->"comment") ];
}
}
:foreach Lease in=[ /ip/dhcp-server/lease/find where status=bound ] do={
:local LeaseVal;
:do {
:set LeaseVal [ /ip/dhcp-server/lease/get $Lease ];
} on-error={
$LogPrintExit2 debug $0 ("A lease just vanished, ignoring.") false;
}
:if ([ :len ($LeaseVal->"address") ] > 0) do={
:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
:local MacDash [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ];
:local HostName [ $CharacterReplace ($LeaseVal->"host-name") " " "" ];
:local Domain ([ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone);
:local DnsRecord [ /ip/dns/static/find where name=($MacDash . "." . $Domain) ];
: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={
$LogPrintExit2 debug $0 ("Multiple bound leases found for mac-address " . ($LeaseVal->"mac-address") . ", using ip address of last one.") false;
:set ($LeaseVal->"address") [ /ip/dhcp-server/lease/get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) address ];
}
:if ($DnsIp = $LeaseVal->"address") do={
$LogPrintExit2 debug $0 ("DNS entry for " . ($MacDash . "." . $Domain) . " does not need updating.") false;
} else={
$LogPrintExit2 info $0 ("Replacing DNS entry for " . ($MacDash . "." . $Domain) . ", new address is " . $LeaseVal->"address" . ".") false;
/ip/dns/static/set address=($LeaseVal->"address") $DnsRecord;
}
:local Cname [ /ip/dns/static/find where type=CNAME cname=($MacDash . "." . $Domain) comment=$Comment ];
:if ([ :len $Cname ] = 0 && [ :len $HostName ] > 0) do={
$LogPrintExit2 info $0 ("Host name appeared, adding CNAME " . ($HostName . "." . $Domain) . " pointing to " . ($MacDash . "." . $Domain) . ".") false;
/ip/dns/static/add name=($HostName . "." . $Domain) type=CNAME cname=($MacDash . "." . $Domain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
}
:if ([ :len $Cname ] > 0 && [ /ip/dns/static/get $Cname name ] != ($HostName . "." . $Domain)) do={
$LogPrintExit2 info $0 ("Host name changed, updating CNAME (pointing to " . ($MacDash . "." . $Domain) . ") to " . ($HostName . "." . $Domain) . ".") false;
/ip/dns/static/set name=($HostName . "." . $Domain) $Cname;
}
} else={
$LogPrintExit2 info $0 ("Adding new DNS entry for " . ($MacDash . "." . $Domain) . ", address is " . $LeaseVal->"address" . ".") false;
/ip/dns/static/add name=($MacDash . "." . $Domain) type=A address=($LeaseVal->"address") ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
:if ([ :len $HostName ] > 0) do={
/ip/dns/static/add name=($HostName . "." . $Domain) type=CNAME cname=($MacDash . "." . $Domain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
}
}
} else={
$LogPrintExit2 debug $0 ("No address available... Ignoring.") false;
}
}
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