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-rw-r--r--dhcp-to-dns.rsc177
1 files changed, 100 insertions, 77 deletions
diff --git a/dhcp-to-dns.rsc b/dhcp-to-dns.rsc
index d6a39e5..9b94098 100644
--- a/dhcp-to-dns.rsc
+++ b/dhcp-to-dns.rsc
@@ -1,107 +1,130 @@
#!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
+# Copyright (c) 2013-2025 Christian Hesse <mail@eworm.de>
+# https://rsc.eworm.de/COPYING.md
#
# provides: lease-script, order=20
+# requires RouterOS, version=7.16
#
# check DHCP leases and add/remove/update DNS entries
-# https://git.eworm.de/cgit/routeros-scripts/about/doc/dhcp-to-dns.md
+# https://rsc.eworm.de/doc/dhcp-to-dns.md
-:local 0 "dhcp-to-dns";
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
-:global Domain;
-:global Identity;
+:local ExitOK false;
+:do {
+ :local ScriptName [ :jobname ];
-:global CharacterReplace;
-:global EitherOr;
-:global IfThenElse;
-:global LogPrintExit2;
-:global ParseKeyValueStore;
-:global ScriptLock;
+ :global Domain;
+ :global Identity;
-$ScriptLock $0 false 10;
+ :global CleanName;
+ :global EitherOr;
+ :global IfThenElse;
+ :global LogPrint;
+ :global LogPrintOnce;
+ :global ParseKeyValueStore;
+ :global ScriptLock;
-:local Ttl 5m;
-:local CommentPrefix ("managed by " . $0 . " for ");
-:local CommentString ("--- " . $0 . " above ---");
+ :if ([ $ScriptLock $ScriptName 10 ] = false) do={
+ :set ExitOK true;
+ :error false;
+ }
-:if ([ :len [ /ip/dns/static/find where (name=$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 or type=A) ] do={
- :local DnsRecordVal [ /ip/dns/static/get $DnsRecord ];
- :local MacAddress [ $CharacterReplace ($DnsRecordVal->"comment") $CommentPrefix "" ];
- :if ([ :len [ /ip/dhcp-server/lease/find where active-mac-address=$MacAddress active-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 $DnsRecord;
- /ip/dns/static/remove [ find where type=CNAME comment=($DnsRecordVal->"comment") ];
+ :local Ttl 5m;
+ :local CommentPrefix ("managed by " . $ScriptName);
+ :local CommentString ("--- " . $ScriptName . " above ---");
+
+ :if ([ :len [ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ] ] = 0) do={
+ /ip/dns/static/add name=$CommentString type=NXDOMAIN disabled=yes;
+ $LogPrint warning $ScriptName ("Added disabled static dns record with name '" . $CommentString . "'.");
}
-}
+ :local PlaceBefore ([ /ip/dns/static/find where (name=$CommentString or (comment=$CommentString and name=-)) type=NXDOMAIN disabled ]->0);
-:foreach Lease in=[ /ip/dhcp-server/lease/find where status=bound ] do={
- :local LeaseVal;
- :do {
- :set LeaseVal [ /ip/dhcp-server/lease/get $Lease ];
- :local DupMacLeases [ /ip/dhcp-server/lease/find where active-mac-address=($LeaseVal->"active-mac-address") status=bound ];
- :if ([ :len $DupMacLeases ] > 1) do={
- $LogPrintExit2 debug $0 ("Multiple bound leases found for mac-address " . ($LeaseVal->"active-mac-address") . ", using last one.") false;
- :set LeaseVal [ /ip/dhcp-server/lease/get ($DupMacLeases->([ :len $DupMacLeases ] - 1)) ];
+ :foreach DnsRecord in=[ /ip/dns/static/find where comment~("^" . $CommentPrefix . "\\b") type=A ] do={
+ :local DnsRecordVal [ /ip/dns/static/get $DnsRecord ];
+ :local DnsRecordInfo [ $ParseKeyValueStore ($DnsRecordVal->"comment") ];
+ :local MacInServer ($DnsRecordInfo->"macaddress" . " in " . $DnsRecordInfo->"server");
+
+ :if ([ :len [ /ip/dhcp-server/lease/find where active-mac-address=($DnsRecordInfo->"macaddress") \
+ active-address=($DnsRecordVal->"address") server=($DnsRecordInfo->"server") status=bound ] ] > 0) do={
+ $LogPrint debug $ScriptName ("Lease for " . $MacInServer . " (" . $DnsRecordVal->"name" . ") still exists. Not deleting record.");
+ } else={
+ :local Found false;
+ $LogPrint info $ScriptName ("Lease expired for " . $MacInServer . ", deleting record (" . $DnsRecordVal->"name" . ").");
+ /ip/dns/static/remove $DnsRecord;
+ /ip/dns/static/remove [ find where type=CNAME comment=($DnsRecordVal->"comment") ];
}
- } on-error={
- $LogPrintExit2 debug $0 ("A lease just vanished, ignoring.") false;
}
- :if ([ :len ($LeaseVal->"active-address") ] > 0) do={
- :local Comment ($CommentPrefix . $LeaseVal->"active-mac-address");
- :local MacDash [ $CharacterReplace ($LeaseVal->"active-mac-address") ":" "-" ];
- :local HostName [ $CharacterReplace [ $EitherOr ([ $ParseKeyValueStore ($LeaseVal->"comment") ]->"hostname") ($LeaseVal->"host-name") ] " " "" ];
- :local Network [ /ip/dhcp-server/network/find where ($LeaseVal->"active-address") in address ];
- :local NetworkVal;
- :if ([ :len $Network ] > 0) do={
- :set NetworkVal [ /ip/dhcp-server/network/get ($Network->0) ];
+ :foreach Lease in=[ /ip/dhcp-server/lease/find where status=bound ] do={
+ :local LeaseVal;
+ :do {
+ :set LeaseVal [ /ip/dhcp-server/lease/get $Lease ];
+ :if ([ :len [ /ip/dhcp-server/lease/find where active-mac-address=($LeaseVal->"active-mac-address") status=bound ] ] > 1) do={
+ $LogPrintOnce info $ScriptName ("Multiple bound leases found for mac-address " . ($LeaseVal->"active-mac-address") . "!");
+ }
+ } on-error={
+ $LogPrint debug $ScriptName ("A lease just vanished, ignoring.");
}
- :local NetworkInfo [ $ParseKeyValueStore ($NetworkVal->"comment") ];
- :local NetDomain ([ $IfThenElse ([ :len ($NetworkInfo->"name-extra") ] > 0) ($NetworkInfo->"name-extra" . ".") ] . \
- [ $EitherOr [ $EitherOr ($NetworkInfo->"domain") ($NetworkVal->"domain") ] $Domain ]);
- :local DnsRecord [ /ip/dns/static/find where comment=$Comment (!type or type=A) ];
- :if ([ :len $DnsRecord ] > 0) do={
- :local DnsRecordVal [ /ip/dns/static/get $DnsRecord ];
+ :if ([ :len ($LeaseVal->"active-address") ] > 0) do={
+ :local Comment ($CommentPrefix . ", macaddress=" . $LeaseVal->"active-mac-address" . ", server=" . $LeaseVal->"server");
+ :local MacDash [ $CleanName ($LeaseVal->"active-mac-address") ];
+ :local HostName [ $CleanName [ $EitherOr ([ $ParseKeyValueStore ($LeaseVal->"comment") ]->"hostname") ($LeaseVal->"host-name") ] ];
+ :local Network [ /ip/dhcp-server/network/find where ($LeaseVal->"active-address") in address ];
+ :local NetworkVal;
+ :if ([ :len $Network ] > 0) do={
+ :set NetworkVal [ /ip/dhcp-server/network/get ($Network->0) ];
+ }
+ :local NetworkInfo [ $ParseKeyValueStore ($NetworkVal->"comment") ];
+ :local NetDomain ([ $IfThenElse ([ :len ($NetworkInfo->"name-extra") ] > 0) ($NetworkInfo->"name-extra" . ".") ] . \
+ [ $EitherOr [ $EitherOr ($NetworkInfo->"domain") ($NetworkVal->"domain") ] $Domain ]);
+ :local FullA ($MacDash . "." . $NetDomain);
+ :local FullCN ($HostName . "." . $NetDomain);
+ :local MacInServer ($LeaseVal->"active-mac-address" . " in " . $LeaseVal->"server");
+
+ :local DnsRecord [ /ip/dns/static/find where comment=$Comment type=A ];
+ :if ([ :len $DnsRecord ] > 0) do={
+ :local DnsRecordVal [ /ip/dns/static/get $DnsRecord ];
+
+ :if ($DnsRecordVal->"address" = $LeaseVal->"active-address" && $DnsRecordVal->"name" = $FullA) do={
+ $LogPrint debug $ScriptName ("The A record for " . $MacInServer . " (" . $FullA . ") does not need updating.");
+ } else={
+ $LogPrint info $ScriptName ("Updating A record for " . $MacInServer . " (" . $FullA . " -> " . $LeaseVal->"active-address" . ").");
+ /ip/dns/static/set address=($LeaseVal->"active-address") name=$FullA $DnsRecord;
+ }
+
+ :local CName [ /ip/dns/static/find where comment=$Comment type=CNAME ];
+ :if ([ :len $CName ] > 0) do={
+ :local CNameVal [ /ip/dns/static/get $CName ];
+ :if ($CNameVal->"name" != $FullCN || $CNameVal->"cname" != $FullA) do={
+ $LogPrint info $ScriptName ("Deleting CNAME record with wrong data for " . $MacInServer . ".");
+ /ip/dns/static/remove $CName;
+ }
+ }
+ :if ([ :len $HostName ] > 0 && [ :len [ /ip/dns/static/find where name=$FullCN type=CNAME ] ] = 0) do={
+ $LogPrint info $ScriptName ("Adding CNAME record for " . $MacInServer . " (" . $FullCN . " -> " . $FullA . ").");
+ /ip/dns/static/add name=$FullCN type=CNAME cname=$FullA ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
+ }
- :if ($DnsRecordVal->"address" = $LeaseVal->"active-address" && $DnsRecordVal->"name" = ($MacDash . "." . $NetDomain)) do={
- $LogPrintExit2 debug $0 ("DNS entry for " . $LeaseVal->"active-mac-address" . " does not need updating.") false;
} else={
- $LogPrintExit2 info $0 ("Replacing DNS entry for " . $LeaseVal->"active-mac-address" . " (" . ($MacDash . "." . $NetDomain) . " -> " . $LeaseVal->"active-address" . ").") false;
- /ip/dns/static/set address=($LeaseVal->"active-address") name=($MacDash . "." . $NetDomain) $DnsRecord;
+ $LogPrint info $ScriptName ("Adding A record for " . $MacInServer . " (" . $FullA . " -> " . $LeaseVal->"active-address" . ").");
+ /ip/dns/static/add name=$FullA type=A address=($LeaseVal->"active-address") ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
+ :if ([ :len $HostName ] > 0 && [ :len [ /ip/dns/static/find where name=$FullCN type=CNAME ] ] = 0) do={
+ $LogPrint info $ScriptName ("Adding CNAME record for " . $MacInServer . " (" . $FullCN . " -> " . $FullA . ").");
+ /ip/dns/static/add name=$FullCN type=CNAME cname=$FullA ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
+ }
}
- :local Cname [ /ip/dns/static/find where comment=$Comment type=CNAME ];
- :if ([ :len $Cname ] = 0 && [ :len $HostName ] > 0) do={
- $LogPrintExit2 info $0 ("Host name appeared, adding CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
- /ip/dns/static/add name=($HostName . "." . $NetDomain) type=CNAME cname=($MacDash . "." . $NetDomain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
- }
- :if ([ :len $Cname ] > 0 && [ /ip/dns/static/get $Cname name ] != ($HostName . "." . $NetDomain)) do={
- $LogPrintExit2 info $0 ("Host name or domain changed, updating CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
- /ip/dns/static/set name=($HostName . "." . $NetDomain) cname=($MacDash . "." . $NetDomain) $Cname;
+ :if ([ :len [ /ip/dns/static/find where name=$FullA type=A ] ] > 1) do={
+ $LogPrintOnce warning $ScriptName ("The name '" . $FullA . "' appeared in more than one A record!");
}
} else={
- $LogPrintExit2 info $0 ("Adding new DNS entry for " . $LeaseVal->"active-mac-address" . " (" . ($MacDash . "." . $NetDomain) . " -> " . $LeaseVal->"active-address" . ").") false;
- /ip/dns/static/add name=($MacDash . "." . $NetDomain) type=A address=($LeaseVal->"active-address") ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
- :if ([ :len $HostName ] > 0) do={
- $LogPrintExit2 info $0 ("Adding new CNAME (" . ($HostName . "." . $NetDomain) . " -> " . ($MacDash . "." . $NetDomain) . ").") false;
- /ip/dns/static/add name=($HostName . "." . $NetDomain) type=CNAME cname=($MacDash . "." . $NetDomain) ttl=$Ttl comment=$Comment place-before=$PlaceBefore;
- }
+ $LogPrint debug $ScriptName ("No address available... Ignoring.");
}
- } else={
- $LogPrintExit2 debug $0 ("No address available... Ignoring.") false;
}
+} on-error={
+ :global ExitError; $ExitError $ExitOK [ :jobname ];
}
generated by cgit v1.2.3-70-g09d2 (git 2.49.0) at 2025-05-11 06:06:40 +0000