Execute custom script on DHCP commit

[jared94]

Hi,

I'm running OPNsense 23.7.10_1.

I'm trying to execute a custom bash script when a client connects to the DHCP server.

First I've changed the file

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/usr/local/etc/inc/plugins.inc.d/dhcpd.inc by adding:

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$dhcpdconf .= 'on commit { execute("/etc/dhcpd/usr/local/sbin/oncommit", "commit"); }';

After DHCP restart from the GUI, the file

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/var/dhcpd/etc/dhcpd.conf is well modified with the new line.

Then I create a file

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/var/dhcpd/etc/dhcpd/usr/local/sbin/oncommit with 777 permission and dhcpd/dhcpd as user/group.

The result in the dhcpd log is :

Unable to execute /run/oncommit: No such file or directory

I've also try with a path that do not depend on the chroot dhcpd path with the same result.

Any help would be appreciate!

[kabi-chan]

I do something similar in my own setup.

Try placing your script in /var/dhcpd/usr/local/sbin/oncommit instead, and then updating your on commit hook to use the path /usr/local/sbin/oncommit

Also, instead of editing the .inc files, which will get overwritten on an update, you should create a separate .conf file in the folder /usr/local/etc/dhcpd.opnsense.d/ (for v4) or /usr/local/etc/dhcpd6.opnsense.d/ (for v6) as suggested by the documentation here: https://docs.opnsense.org/manual/dhcp.html#advanced-settings