diff options
Diffstat (limited to 'dhcp-to-dns.rsc')
-rw-r--r-- | dhcp-to-dns.rsc | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/dhcp-to-dns.rsc b/dhcp-to-dns.rsc new file mode 100644 index 0000000..a3d41c9 --- /dev/null +++ b/dhcp-to-dns.rsc @@ -0,0 +1,126 @@ +#!rsc by RouterOS +# RouterOS script: dhcp-to-dns +# Copyright (c) 2013-2024 Christian Hesse <mail@eworm.de> +# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md +# +# provides: lease-script, order=20 +# requires RouterOS, version=7.13 +# +# check DHCP leases and add/remove/update DNS entries +# https://git.eworm.de/cgit/routeros-scripts/about/doc/dhcp-to-dns.md + +:global GlobalFunctionsReady; +:while ($GlobalFunctionsReady != true) do={ :delay 500ms; } + +:do { + :local ScriptName [ :jobname ]; + + :global Domain; + :global Identity; + + :global CleanName; + :global EitherOr; + :global IfThenElse; + :global LogPrint; + :global LogPrintOnce; + :global ParseKeyValueStore; + :global ScriptLock; + + :if ([ $ScriptLock $ScriptName 10 ] = false) do={ + :error false; + } + + :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 DnsRecord in=[ /ip/dns/static/find where comment~("^" . $CommentPrefix . "\\b") (!type or 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") ]; + } + } + + :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 $ScriptName ("A lease just vanished, ignoring."); + } + + :if ([ :len ($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 or 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; + } + + } else={ + $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; + } + } + + :if ([ :len [ /ip/dns/static/find where name=$FullA (!type or type=A) ] ] > 1) do={ + $LogPrintOnce warning $ScriptName ("The name '" . $FullA . "' appeared in more than one A record!"); + } + } else={ + $LogPrint debug $ScriptName ("No address available... Ignoring."); + } + } +} on-error={ } |