5bd13c8d59
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.
45 lines
1.2 KiB
Bash
45 lines
1.2 KiB
Bash
#!/bin/sh
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# This is a NetworkManager dispatcher script for chronyd to update
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# its NTP sources with servers from DHCP options passed by NetworkManager
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# in the DHCP4_NTP_SERVERS and DHCP6_DHCP6_NTP_SERVERS environment variables.
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export LC_ALL=C
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interface=$1
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action=$2
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chronyc=/usr/bin/chronyc
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server_options=iburst
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server_dir=/var/run/chrony-dhcp
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dhcp_server_file=$server_dir/$interface.sources
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dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
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add_servers_from_dhcp() {
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rm -f "$dhcp_server_file"
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for server in $dhcp_ntp_servers; do
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# Check for invalid characters (from the DHCPv6 NTP FQDN suboption)
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printf '%s\n' "$server" | grep -E -q '^[-A-Za-z0-9:.]{1,255}$' || continue
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printf 'server %s %s\n' "$server" "$server_options" >> "$dhcp_server_file"
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done
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$chronyc reload sources > /dev/null 2>&1 || :
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}
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clear_servers_from_dhcp() {
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if [ -f "$dhcp_server_file" ]; then
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rm -f "$dhcp_server_file"
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$chronyc reload sources > /dev/null 2>&1 || :
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fi
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}
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mkdir -p $server_dir
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case "$action" in
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up|dhcp4-change|dhcp6-change)
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add_servers_from_dhcp;;
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down)
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clear_servers_from_dhcp;;
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esac
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exit 0
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