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#!/usr/bin/sh
# This is a NetworkManager dispatcher script for chronyd to update
# 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
interface=$1
action=$2
[ -f /etc/sysconfig/network ] && . /etc/sysconfig/network
[ -f /etc/sysconfig/network-scripts/ifcfg-"${interface}" ] && \
. /etc/sysconfig/network-scripts/ifcfg-"${interface}"
chronyc=/usr/bin/chronyc
server_options=${NTPSERVERARGS:-iburst}
server_dir=/run/chrony-dhcp
dhcp_server_file=$server_dir/$interface.sources
dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
add_servers_from_dhcp() {
rm -f "$dhcp_server_file"
# Don't add NTP servers if PEERNTP=no specified; return early.
[ "$PEERNTP" = "no" ] && return
for server in $dhcp_ntp_servers; do
# Check for invalid characters (from the DHCPv6 NTP FQDN suboption)
len1=$(printf '%s' "$server" | wc -c)
len2=$(printf '%s' "$server" | tr -d -c 'A-Za-z0-9:.-' | wc -c)
if [ "$len1" -ne "$len2" ] || [ "$len2" -lt 1 ] || [ "$len2" -gt 255 ]; then
continue
fi
printf 'server %s %s\n' "$server" "$server_options" >> "$dhcp_server_file"
done
$chronyc reload sources > /dev/null 2>&1 || :
}
clear_servers_from_dhcp() {
if [ -f "$dhcp_server_file" ]; then
rm -f "$dhcp_server_file"
$chronyc reload sources > /dev/null 2>&1 || :
fi
}
mkdir -p $server_dir
case "$action" in
up|dhcp4-change|dhcp6-change)
add_servers_from_dhcp;;
down)
clear_servers_from_dhcp;;
esac
exit 0