53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
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# Hostnames passed to DHCP are appended with the zone.
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:local dhcpserver "dhcp-lan"
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:local zone "domain.local"
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:local ttl "12:00:00"
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# Clear old static DNS entries matching the zone and TTL.
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/ip dns static
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:foreach dnsrecord in=[find where name ~ (".*\\.".$zone) ] do={
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:local fqdn [ get $dnsrecord name ]
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:local hostname [ :pick $fqdn 0 ( [ :len $fqdn ] - ( [ :len $zone ] + 1 ) ) ]
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:local recordttl [get $dnsrecord ttl]
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:if ( $recordttl != $ttl ) do={
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:log debug ("Ignoring DNS record $fqdn with TTL $recordttl")
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} else={
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/ip dhcp-server lease
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:local dhcplease [ find where host-name=$hostname and server="$dhcpserver"]
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:if ( [ :len $dhcplease ] > 0) do={
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:log debug ("DHCP lease exists for $hostname in $dhcpserver, keeping DNS record $fqdn")
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} else={
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:log info ("DHCP lease expired for $hostname, deleting DNS record $fqdn")
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/ip dns static remove $dnsrecord
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}
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}
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}
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# Create or update static DNS entries from DHCP server leases.
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/ip dhcp-server lease
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:foreach dhcplease in=[find where server ~ ("$dhcpserver")] do={
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:local hostname [ get $dhcplease host-name ]
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:if ( [ :len $hostname ] > 0) do={
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:local dhcpip [ get $dhcplease address ]
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:local fqdn ( $hostname . "." . $zone )
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/ip dns static
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:local dnsrecord [ find where name=$fqdn ]
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:if ( [ :len $dnsrecord ] > 0 ) do={
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:local dnsip [ get $dnsrecord address ]
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:if ( $dnsip = $dhcpip ) do={
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:log debug ("DNS record for $fqdn to $dhcpip is up to date")
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} else={
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:log info ("Updating DNS record for $fqdn to $dhcpip")
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/ip dns static remove $dnsrecord
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/ip dns static add name=$fqdn address=$dhcpip ttl=$ttl
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}
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} else={
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:log info ("Creating DNS record for $fqdn to $dhcpip")
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/ip dns static add name=$fqdn address=$dhcpip ttl=$ttl
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}
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}
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}
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