mirror of
https://github.com/eworm-de/routeros-scripts
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76 lines
2.6 KiB
Text
76 lines
2.6 KiB
Text
#
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# RouterOS script: dhcp-to-dns
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# Copyright (c) 2013-2018 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 "identity";
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:global "domain";
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:global "hostname-in-zone";
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:local zone;
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:if ($"hostname-in-zone" = 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 "00:05:00";
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:local hostname;
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:local fqdn;
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:local dnsip;
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:local dhcpip;
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:local dnsnode;
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:local dhcpnode;
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:foreach static in=[ / ip dns static find where name ~ (".*\\." . $zone) ] do={
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:set fqdn [ / ip dns static get $static name ];
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:set hostname [ :pick $fqdn 0 ( [ :len $fqdn ] - ( [ :len $zone ] + 1 ) ) ];
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:set dhcpnode [ / ip dhcp-server lease find where host-name=$hostname dynamic=yes ];
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:if ( [ :len $dhcpnode ] > 0) do={
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:log debug ("Lease for " . $hostname . " still exists. Not deleting.");
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} else={
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:local found false;
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:log info ("Lease expired for " . $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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:set dhcpip [ / ip dhcp-server lease get $lease address ];
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:local comment ("managed by dhcp-to-dns for " . $mac);
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:set hostname [ / ip dhcp-server lease get $lease host-name ];
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:while ($hostname ~ " ") do={
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:local pos [ :find $hostname " " ];
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:set hostname ( [ :pick $hostname 0 $pos ] . [ :pick $hostname ($pos + 1) 999 ] );
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};
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:if ( [ :len $hostname ] > 0) do={
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:set fqdn ( $hostname . "." . $zone );
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:set dnsnode [ / ip dns static find where name=$fqdn ];
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:if ( [ :len $dnsnode ] > 0 ) do={
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:set 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 [ :len [ / ip dhcp-server lease find 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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}
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