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examples: support DHCPv6 NTP servers in NM dispatcher script

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Latest NetworkManager code provides NTP servers from the DHCPv6 NTP
option (RFC 5908) in the DHCP6_DHCP6_NTP_SERVERS variable to dispatcher
scripts.

Check for invalid characters (which can come from the FQDN suboption)
and include the servers in the interface-specific sources file.
This commit is contained in:
Miroslav Lichvar 2022-02-07 13:27:25 +01:00
parent 759580aa6f
commit 5bd13c8d59
1 changed files with 15 additions and 13 deletions
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28
examples/chrony.nm-dispatcher.dhcp
View file

@ -1,8 +1,7 @@
#!/bin/sh
# This is a NetworkManager dispatcher script for chronyd to update
# its NTP sources passed from DHCP options. Note that this script is
# specific to NetworkManager-dispatcher due to use of the
# DHCP4_NTP_SERVERS environment variable.
# its NTP sources with servers from DHCP options passed by NetworkManager
# in the DHCP4_NTP_SERVERS and DHCP6_DHCP6_NTP_SERVERS environment variables.
export LC_ALL=C
@ -10,17 +9,19 @@ interface=$1
action=$2
chronyc=/usr/bin/chronyc
default_server_options=iburst
server_options=iburst
server_dir=/var/run/chrony-dhcp
dhcp_server_file=$server_dir/$interface.sources
# DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.
nm_dhcp_servers=$DHCP4_NTP_SERVERS
dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
add_servers_from_dhcp() {
rm -f "$dhcp_server_file"
for server in $nm_dhcp_servers; do
echo "server $server $default_server_options" >> "$dhcp_server_file"
for server in $dhcp_ntp_servers; do
# Check for invalid characters (from the DHCPv6 NTP FQDN suboption)
printf '%s\n' "$server" | grep -E -q '^[-A-Za-z0-9:.]{1,255}$' || continue
printf 'server %s %s\n' "$server" "$server_options" >> "$dhcp_server_file"
done
$chronyc reload sources > /dev/null 2>&1 || :
}
@ -34,10 +35,11 @@ clear_servers_from_dhcp() {
mkdir -p $server_dir
if [ "$action" = "up" ] || [ "$action" = "dhcp4-change" ]; then
add_servers_from_dhcp
elif [ "$action" = "down" ]; then
clear_servers_from_dhcp
fi
case "$action" in
up|dhcp4-change|dhcp6-change)
add_servers_from_dhcp;;
down)
clear_servers_from_dhcp;;
esac
exit 0