mirror of
https://github.com/eworm-de/routeros-scripts.git
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69 lines
2.6 KiB
Plaintext
69 lines
2.6 KiB
Plaintext
#!rsc
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# RouterOS script: dhcp-to-dns
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# Copyright (c) 2013-2019 Christian Hesse <mail@eworm.de>
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#
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# check DHCP leases and add/remove/update DNS entries
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:global CharacterReplace;
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:global Identity;
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:global Domain;
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:global HostNameInZone;
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:local Zone;
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:if ($HostNameInZone = true) do={
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:set Zone ("dhcp." . $Identity . "." . $Domain);
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} else={
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:set Zone ("dhcp." . $Domain);
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}
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:local Ttl 5m;
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:local CommentPrefix "managed by dhcp-to-dns for ";
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:foreach Static in=[ / ip dns static find where comment ~ $CommentPrefix ] do={
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:local MacAddress [ $CharacterReplace [ / ip dns static get $Static comment ] $CommentPrefix "" ];
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:local IpAddress [ / ip dns static get $Static address ];
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:local HostName [ / ip dns static get $Static name ];
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:if ([ / ip dhcp-server lease print count-only where mac-address=$MacAddress address=$IpAddress dynamic=yes ] > 0) do={
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:log debug ("Lease for " . $MacAddress . " (" . $HostName . ") still exists. Not deleting DNS entry.");
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} else={
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:local Found false;
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:log info ("Lease expired for " . $MacAddress . " (" . $HostName . "), deleting DNS entry.");
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/ ip dns static remove $Static;
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}
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}
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:foreach Lease in=[ / ip dhcp-server lease find where dynamic=yes ] do={
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:local Mac [ / ip dhcp-server lease get $Lease mac-address ];
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:local DhcpIp [ / ip dhcp-server lease get $Lease address ];
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:local Comment ($CommentPrefix . $Mac);
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:local HostName [ $CharacterReplace [ / ip dhcp-server lease get $Lease host-name ] " " "" ];
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:if ($HostName = "") do={
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:set HostName [ $CharacterReplace [ / ip dhcp-server lease get $Lease mac-address ] ":" "-" ];
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}
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:local Fqdn ($HostName . "." . $Zone);
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:local DnsNode [ / ip dns static find where name=$Fqdn ];
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:if ([ :len $DnsNode ] > 0) do={
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:local DnsIp [ / ip dns static get $DnsNode address ];
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:local Leases [ / ip dhcp-server lease find where host-name=$HostName dynamic=yes ];
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:local HostNameCount [ / ip dhcp-server lease print count-only where host-name=$HostName dynamic=yes ];
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:if ($HostNameCount > 1) do={
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:foreach J,Lease in=$Leases do={
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:if ($J + 1 = $HostNameCount) do={
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:set DhcpIp [ / ip dhcp-server lease get $Lease address ];
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}
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}
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}
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:if ($DnsIp = $DhcpIp) do={
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:log debug ("DNS entry for " . $Fqdn . " does not need updating.");
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} else={
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:log info ("Replacing DNS entry for " . $Fqdn . ", new address is " . $DhcpIp . ".");
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/ ip dns static set name=$Fqdn address=$DhcpIp ttl=$Ttl comment=$Comment $DnsNode;
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}
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} else={
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:log info ("Adding new DNS entry for " . $Fqdn . ", address is " . $DhcpIp . ".");
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/ ip dns static add name=$Fqdn address=$DhcpIp ttl=$Ttl comment=$Comment;
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}
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}
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