On 06/09/2022 17:23, Taylor Fox wrote:
Hello,
I am trying to write a script for logging & notification whenever
a new DHCP lease is issued, and I currently have a script that uses the
`dnsmasq_client_id` environment variable to get the MAC address of the
device that the lease was issued, but I have had an issue where on some
device that variable is not present and causes the script to fail. Could
anyone shed a light on why this is not working? Otherwise, any better
way of finding the MAC address other than diffing /etc/dhcp.leases.
Some DHCP clients don't provide a client-id. If the client doesn't
provide a client-id, the variable will not be set. If you look in
/etc/dhcp.leases, if the fifth and final field on a line is "*" then no
client-id was provided.
extracting the MAC address from a client-id is risky: client-ids may be
constructed in other ways.
The MAC address is always provided (at least for DHCPv4) as the second
argument of the script, does that solve the problem?
Simon.
Thanks in advance.
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