VyOS command definitions, scripts, and utilities (mirror of https://github.com/vyos/vyos-1x.git) https://git.amelek.net/vyos/vyos-1x.git/atom?h=feature%2FT9082-codeql-cpp 2026-03-19T21:37:45+00:00 2026-03-19T21:37:45+00:00 Christian Breunig christian@breunig.cc 2025-11-07T21:05:59+00:00 urn:sha1:b84bdbf8dd25995aa564081632de6251ecf5ad4e Implementing a daemon that listens for netlink messages in Python was discussed for many years. This is a proof-of-concept implementation how we can listen for netlink messages and process them in Python. Python 3.10 minimum is required due to the use of case statements which mimics C-style switch/case instructions. Add example: set interfaces ethernet eth1 vif 21 address dhcp set interfaces ethernet eth1 vif 21 address dhcpv6 commit If network cable is unplugged: vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=DOWN, mac=00:50:56:b3:9d:8e vyos-netlinkd[12681]: Stopping dhclient@eth3.10.service... vyos-netlinkd[12681]: Stopping dhcp6c@eth3.10.service... If cable is plugged back in: vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=DOWN, mac=00:50:56:b3:9d:8e vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=UP, mac=00:50:56:b3:9d:8e vyos-netlinkd[12681]: Restarting dhclient@eth3.10.service... vyos-netlinkd[12681]: Restarting dhcp6c@eth3.10.service... 2023-08-16T11:22:14+00:00 Christian Breunig christian@breunig.cc 2023-08-15T10:42:54+00:00 urn:sha1:1ab8166a5481c184ded9abf8da48dd0d391c8ae3 There are two hooks called for bridge, ethernet and bond interfaces if the link-state changes up -> down or down -> up. The helpers are: * /etc/netplug/linkdown.d/dhclient * /etc/netplug/linkup.d/dhclient As those helpers use Linux actions to start/restart the dhclient process in Perl it's time to rewrite it. First goal is to get rid of all Perl code and the second is that we now have a Proper Python library. Instead of checking if the process is running the then restarting it without even systemd noticing (yeah we might get two processes beeing alive) we should: * Add a Python helper that can be used for both up and down (see man 8 netplugd FILES section) * Query the VyOS CLI config if the interface in question has DHCP(v6) configured and is not disabled * Add IPv6 DHCPv6 support MAN page: https://linux.die.net/man/8/netplugd 2020-12-14T17:50:34+00:00 Christian Poessinger christian@poessinger.com 2020-12-14T17:50:34+00:00 urn:sha1:36eb1b34e9b9b048bf91a3236849f27d44287931