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dhcp-to-dns: support host name from dhcp lease comment

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The lease comment is supposed to be a human readable string... But we
could allow parsable information.
This commit is contained in:
Christian Hesse 2023-03-25 22:33:02 +01:00
parent 40f0d54ea8
commit d700dbc00e
2 changed files with 16 additions and 1 deletions
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4
dhcp-to-dns.rsc
View file

@ -19,8 +19,10 @@
:global ServerNameInZone; :global ServerNameInZone;
:global CharacterReplace; :global CharacterReplace;
:global EitherOr;
:global IfThenElse; :global IfThenElse;
:global LogPrintExit2; :global LogPrintExit2;
:global ParseKeyValueStore;
:global ScriptLock; :global ScriptLock;
$ScriptLock $0 false 10; $ScriptLock $0 false 10;
@ -62,7 +64,7 @@ $ScriptLock $0 false 10;
:if ([ :len ($LeaseVal->"address") ] > 0) do={ :if ([ :len ($LeaseVal->"address") ] > 0) do={
:local Comment ($CommentPrefix . $LeaseVal->"mac-address"); :local Comment ($CommentPrefix . $LeaseVal->"mac-address");
:local MacDash [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ]; :local MacDash [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ];
:local HostName [ $CharacterReplace ($LeaseVal->"host-name") " " "" ]; :local HostName [ $CharacterReplace [ $EitherOr ([ $ParseKeyValueStore ($LeaseVal->"comment") ]->"hostname") ($LeaseVal->"host-name") ] " " "" ];
:local Domain ([ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone); :local Domain ([ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone);
:local DnsRecord [ /ip/dns/static/find where name=($MacDash . "." . $Domain) ]; :local DnsRecord [ /ip/dns/static/find where name=($MacDash . "." . $Domain) ];

13
doc/dhcp-to-dns.md
View file

@ -41,6 +41,19 @@ The configuration goes to `global-config-overlay`, these are the parameters:
* `PrefixInZone`: whether or not to add prefix `dhcp` * `PrefixInZone`: whether or not to add prefix `dhcp`
* `ServerNameInZone`: whether or not to add DHCP server name * `ServerNameInZone`: whether or not to add DHCP server name
### Host name from DHCP lease comment
Overwriting the host name from dhcp lease comment is supported, just add
something like `hostname=new-hostname` in comment, and separate it by comma
from other information if required:
/ip/dhcp-server/lease/add address=10.0.0.50 comment="my device, hostname=new-hostname" mac-address=00:11:22:33:44:55 server=dhcp;
Note this information can be configured in wireless access list with
[dhcp-lease-comment](dhcp-lease-comment.md), though it comes with a delay
then due to script execution order. Decrease the scheduler interval to
reduce the effect.
See also See also
-------- --------