blob: 547ce83f5bd113201f7ed65471d4a5f2cd892d2d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#!/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=$2
chronyc=/usr/bin/chronyc
server_options=iburst
server_dir=/var/run/chrony-dhcp
dhcp_server_file=$server_dir/$interface.sources
dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
add_servers_from_dhcp() {
rm -f "$dhcp_server_file"
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
|
