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routeros-scripts
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dhcp-to-dns: get domain from dhcp server's network definition

This commit is contained in:
Christian Hesse 2023-04-13 00:32:13 +02:00
parent ac5d84173f
commit ee94024dca
5 changed files with 29 additions and 15 deletions
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15
dhcp-to-dns.rsc
View File

@ -13,10 +13,7 @@
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
:global Domain;
:global HostNameInZone;
:global Identity;
:global PrefixInZone;
:global ServerNameInZone;
:global CharacterReplace;
:global EitherOr;
@ -27,9 +24,6 @@
$ScriptLock $0 false 10;
:local Zone \
([ $IfThenElse ($PrefixInZone = true) "dhcp." ] . \
[ $IfThenElse ($HostNameInZone = true) ($Identity . ".") ] . $Domain);
:local Ttl 5m;
:local CommentPrefix ("managed by " . $0 . " for ");
:local CommentString ("--- " . $0 . " above ---");
@ -70,7 +64,14 @@ $ScriptLock $0 false 10;
:local Comment ($CommentPrefix . $LeaseVal->"mac-address");
:local MacDash [ $CharacterReplace ($LeaseVal->"mac-address") ":" "-" ];
:local HostName [ $CharacterReplace [ $EitherOr ([ $ParseKeyValueStore ($LeaseVal->"comment") ]->"hostname") ($LeaseVal->"host-name") ] " " "" ];
:local NetDomain ([ $IfThenElse ($ServerNameInZone = true) ($LeaseVal->"server" . ".") ] . $Zone);
:local Network [ /ip/dhcp-server/network/find where ($LeaseVal->"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") ] $Domain ]);
:local DnsRecord [ /ip/dns/static/find where comment=$Comment (!type or type=A) ];
:if ([ :len $DnsRecord ] > 0) do={

23
doc/dhcp-to-dns.md
View File

@ -34,12 +34,27 @@ On first run a disabled static dns record acting as marker (with comment
"`--- dhcp-to-dns above ---`") is added. Move this entry to define where new
entries are to be added.
The configuration goes to `global-config-overlay`, these are the parameters:
The configuration goes to dhcp server's network definition. The domain is
used to form the dns name:
/ip/dhcp-server/network/add address=10.0.0.0/24 domain=example.com;
A bound lease for mac address `00:11:22:33:44:55` with ip address
`10.0.0.50` would result in an A record `00-11-22-33-44-55.example.com`
pointing to the given ip address.
Additional options can be given from comment, to add an extra level in
dns name or define a different domain.
/ip/dhcp-server/network/add address=10.0.0.0/24 domain=example.com comment="domain=another-domain.com, name-extra=dhcp";
This example would result in name `00-11-22-33-44-55.dhcp.another-domain.com`
for the same lease.
If no domain is found in dhcp server's network definition a fallback from
`global-config-overlay` is used. This is the parameter:
* `Domain`: the domain used for dns records
* `HostNameInZone`: whether or not to add the dhcp/dns server's hostname
* `PrefixInZone`: whether or not to add prefix `dhcp`
* `ServerNameInZone`: whether or not to add DHCP server name
### Host name from DHCP lease comment

3
global-config.rsc
View File

@ -14,9 +14,6 @@
# This is used for DNS and backup file.
:global Domain "example.com";
:global HostNameInZone true;
:global PrefixInZone true;
:global ServerNameInZone false;
# You can send e-mail notifications. Configure the system's mail settings
# (/tool/e-mail), then install the module:

2
global-functions.rsc
View File

@ -12,7 +12,7 @@
:local 0 "global-functions";
# expected configuration version
:global ExpectedConfigVersion 98;
:global ExpectedConfigVersion 99;
# global variables not to be changed by user
:global GlobalFunctionsReady false;

1
news-and-changes.rsc
View File

@ -12,6 +12,7 @@
96="Added support for notes in 'netwatch-notify', these are included verbatim into the notification.";
97="Modified 'dhcp-to-dns' to always add A records for names with mac address, and optionally add CNAME records if the host name is available.";
98="Extended 'check-certificates' to download new certificate by SubjectAltNames if download by CommonName fails.";
99="Modified 'dhcp-to-dns', which dropped global configuration. Settings moved to dhcp server's network definitions.";
};
# Migration steps to be applied on script updates