This is a daemon for monitoring lease changes on OpenBSD for the specified interfaces. When a change happens it then calls a script located in /etc/dhcpleasemon. The script name should be:

lease_trigger_<interface>

The script has access to the following environment variables:

• $DHCP_IFACE – interface name
• $DHCP_IP_ROUTE – default route for the interface
• $DHCP_IP_ADDR – IP address from the lease

The daemon is implemented in Rust and is available on GitHub.

Installation

pname="dhcpleasemon"

cargo build --release

install -o root -g wheel -d /etc/$pname
install -o root -g bin target/release/$pname /usr/local/sbin/$pname
install -o root -g wheel -m 0555 rc.d/$pname /etc/rc.d/$pname

Example entries in rc.conf.local:

pkg_scripts=dhcpleasemon
dhcpleasemon_flags=-i em0 -i em1 -6