diff options
Diffstat (limited to 'src/etc/dhcp/dhclient-enter-hooks.d/05-vyos-mtureplace')
| -rw-r--r-- | src/etc/dhcp/dhclient-enter-hooks.d/05-vyos-mtureplace | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/etc/dhcp/dhclient-enter-hooks.d/05-vyos-mtureplace b/src/etc/dhcp/dhclient-enter-hooks.d/05-vyos-mtureplace new file mode 100644 index 000000000..4a08765ba --- /dev/null +++ b/src/etc/dhcp/dhclient-enter-hooks.d/05-vyos-mtureplace @@ -0,0 +1,38 @@ +# replace MTU with value from configuration + +# get MTU value via Python +# as configuration is not available to cli-shell-api at the first boot, we must use vyos.config, which contain workaround for this, instead clean shell +function get_mtu { +python3 - <<PYEND +from vyos.config import Config +import os +import re + +# check if interface is not VLAN and fix name if necessary +interface_name = os.getenv('interface', '') +regex_filter = re.compile('^(?P<interface>\w+)\.(?P<vid>\d+)$') +if regex_filter.search(interface_name): + iface = regex_filter.search(interface_name).group('interface') + vid = regex_filter.search(interface_name).group('vid') + interface_name = "{} vif {}".format(iface, vid) + +# initialize config +config = Config() +if config.exists('interfaces'): + iface_types = config.list_nodes('interfaces') + for iface_type in iface_types: + # check if configuration contain MTU value for interface and return (print) it + if config.exists("interfaces {} {} mtu".format(iface_type, interface_name)): + print(format(config.return_value("interfaces {} {} mtu".format(iface_type, interface_name)))) +PYEND +} + +# check if DHCP server return MTU value +if [ -n "$new_interface_mtu" ]; then + # try to get MTU from config and replace original one + configured_mtu="$(get_mtu)" + if [[ -n $configured_mtu ]] ; then + logmsg info "Replacing MTU value for $interface with preconfigured one: $configured_mtu" + new_interface_mtu="$configured_mtu" + fi +fi |