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Add support for using DHCP-provided NTP server

This commit is contained in:
Marc Brooks 2025-06-18 20:27:36 -05:00
parent 087487fe9c
commit 926fcf202a
No known key found for this signature in database
GPG Key ID: 583A6AF2D6AE1DC6
5 changed files with 81 additions and 17 deletions
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4
internal/confparser/confparser_test.go
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@ -46,8 +46,8 @@ type testNetworkConfig struct {
TimeSyncOrdering []string `json:"time_sync_ordering,omitempty" one_of:"http,ntp,ntp_dhcp,ntp_user_provided,http_user_provided" default:"ntp,http"`
TimeSyncDisableFallback null.Bool `json:"time_sync_disable_fallback,omitempty" default:"false"`
TimeSyncParallel null.Int `json:"time_sync_parallel,omitempty" default:"4"`
TimeSyncNTPServers []string `json:"time_sync_ntp_servers,omitempty" validate_type:"ipv4_or_ipv6" required_if:"TimeSyncOrdering=ntp_custom"`
TimeSyncHTTPUrls []string `json:"time_sync_http_urls,omitempty" validate_type:"url" required_if:"TimeSyncOrdering=http_custom"`
TimeSyncNTPServers []string `json:"time_sync_ntp_servers,omitempty" validate_type:"ipv4_or_ipv6" required_if:"TimeSyncOrdering=ntp_user_provided"`
TimeSyncHTTPUrls []string `json:"time_sync_http_urls,omitempty" validate_type:"url" required_if:"TimeSyncOrdering=http_user_provided"`
}
func TestValidateConfig(t *testing.T) {

6
internal/network/config.go
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@ -45,11 +45,11 @@ type NetworkConfig struct {
LLDPTxTLVs []string `json:"lldp_tx_tlvs,omitempty" one_of:"chassis,port,system,vlan" default:"chassis,port,system,vlan"`
MDNSMode null.String `json:"mdns_mode,omitempty" one_of:"disabled,auto,ipv4_only,ipv6_only" default:"auto"`
TimeSyncMode null.String `json:"time_sync_mode,omitempty" one_of:"ntp_only,ntp_and_http,http_only,custom" default:"ntp_and_http"`
TimeSyncOrdering []string `json:"time_sync_ordering,omitempty" one_of:"http,ntp,ntp_dhcp,ntp_custom,http_custom" default:"ntp,http"`
TimeSyncOrdering []string `json:"time_sync_ordering,omitempty" one_of:"http,ntp,ntp_dhcp,ntp_user_provided,http_user_provided" default:"ntp,http"`
TimeSyncDisableFallback null.Bool `json:"time_sync_disable_fallback,omitempty" default:"false"`
TimeSyncParallel null.Int `json:"time_sync_parallel,omitempty" default:"4"`
TimeSyncNTPServers []string `json:"time_sync_ntp_servers,omitempty" validate_type:"ipv4_or_ipv6" required_if:"TimeSyncOrdering=ntp_custom"`
TimeSyncHTTPUrls []string `json:"time_sync_http_urls,omitempty" validate_type:"url" required_if:"TimeSyncOrdering=http_custom"`
TimeSyncNTPServers []string `json:"time_sync_ntp_servers,omitempty" validate_type:"ipv4_or_ipv6" required_if:"TimeSyncOrdering=ntp_user_provided"`
TimeSyncHTTPUrls []string `json:"time_sync_http_urls,omitempty" validate_type:"url" required_if:"TimeSyncOrdering=http_user_provided"`
}
func (c *NetworkConfig) GetMDNSMode() *mdns.MDNSListenOptions {

44
internal/network/netif.go
View File

@ -21,6 +21,7 @@ type NetworkInterfaceState struct {
ipv6Addr *net.IP
ipv6Addresses []IPv6Address
ipv6LinkLocal *net.IP
ntpAddresses []*net.IP
macAddr *net.HardwareAddr
l *zerolog.Logger
@ -76,6 +77,7 @@ func NewNetworkInterfaceState(opts *NetworkInterfaceOptions) (*NetworkInterfaceS
onInitialCheck: opts.OnInitialCheck,
cbConfigChange: opts.OnConfigChange,
config: opts.NetworkConfig,
ntpAddresses: make([]*net.IP, 0),
}
// create the dhcp client
@ -89,7 +91,7 @@ func NewNetworkInterfaceState(opts *NetworkInterfaceOptions) (*NetworkInterfaceS
opts.Logger.Error().Err(err).Msg("failed to update network state")
return
}
_ = s.updateNtpServersFromLease(lease)
_ = s.setHostnameIfNotSame()
opts.OnDhcpLeaseChange(lease)
@ -135,6 +137,27 @@ func (s *NetworkInterfaceState) IPv6String() string {
return s.ipv6Addr.String()
}
func (s *NetworkInterfaceState) NtpAddresses() []*net.IP {
return s.ntpAddresses
}
func (s *NetworkInterfaceState) NtpAddressesString() []string {
ntpServers := []string{}
if s != nil {
s.l.Debug().Any("s", s).Msg("getting NTP address strings")
if len(s.ntpAddresses) > 0 {
for _, server := range s.ntpAddresses {
s.l.Debug().IPAddr("server", *server).Msg("converting NTP address")
ntpServers = append(ntpServers, server.String())
}
}
}
return ntpServers
}
func (s *NetworkInterfaceState) MAC() *net.HardwareAddr {
return s.macAddr
}
@ -318,6 +341,25 @@ func (s *NetworkInterfaceState) update() (DhcpTargetState, error) {
return dhcpTargetState, nil
}
func (s *NetworkInterfaceState) updateNtpServersFromLease(lease *udhcpc.Lease) error {
if lease != nil && len(lease.NTPServers) > 0 {
s.l.Info().Msg("lease found, updating DHCP NTP addresses")
s.ntpAddresses = make([]*net.IP, 0, len(lease.NTPServers))
for _, ntpServer := range lease.NTPServers {
if ntpServer != nil {
s.l.Info().IPAddr("ntp_server", ntpServer).Msg("NTP server found in lease")
s.ntpAddresses = append(s.ntpAddresses, &ntpServer)
}
}
} else {
s.l.Info().Msg("no NTP servers found in lease")
s.ntpAddresses = make([]*net.IP, 0, len(s.config.TimeSyncNTPServers))
}
return nil
}
func (s *NetworkInterfaceState) CheckAndUpdateDhcp() error {
dhcpTargetState, err := s.update()
if err != nil {

22
internal/timesync/timesync.go
View File

@ -29,6 +29,7 @@ type TimeSync struct {
l *zerolog.Logger
networkConfig *network.NetworkConfig
dhcpNtpAddresses []string
rtcDevicePath string
rtcDevice *os.File //nolint:unused
@ -64,6 +65,7 @@ func NewTimeSync(opts *TimeSyncOptions) *TimeSync {
t := &TimeSync{
syncLock: &sync.Mutex{},
l: opts.Logger,
dhcpNtpAddresses: []string{},
rtcDevicePath: rtcDevice,
rtcLock: &sync.Mutex{},
preCheckFunc: opts.PreCheckFunc,
@ -78,11 +80,15 @@ func NewTimeSync(opts *TimeSyncOptions) *TimeSync {
return t
}
func (t *TimeSync) SetDhcpNtpAddresses(addresses []string) {
t.dhcpNtpAddresses = addresses
}
func (t *TimeSync) getSyncMode() SyncMode {
syncMode := SyncMode{
Ntp: true,
Http: true,
Ordering: []string{"ntp_dhcp", "ntp_fallback", "http_fallback"},
Ordering: []string{"ntp_dhcp", "ntp", "http"},
NtpUseFallback: true,
HttpUseFallback: true,
}
@ -161,7 +167,7 @@ func (t *TimeSync) Sync() error {
Orders:
for _, mode := range syncMode.Ordering {
switch mode {
case "ntp_custom":
case "ntp_user_provided":
if syncMode.Ntp {
t.l.Info().Msg("using NTP custom servers")
now, offset = t.queryNetworkTime(t.networkConfig.TimeSyncNTPServers)
@ -170,7 +176,15 @@ Orders:
break Orders
}
}
case "ntp_fallback":
case "ntp_dhcp":
if syncMode.Ntp {
t.l.Info().Msg("using NTP servers from DHCP")
now, offset = t.queryNetworkTime(t.dhcpNtpAddresses)
if now != nil {
t.l.Info().Str("source", "NTP DHCP").Time("now", *now).Msg("time obtained")
break Orders
}
}
case "ntp":
if syncMode.Ntp && syncMode.NtpUseFallback {
t.l.Info().Msg("using NTP fallback")
@ -180,7 +194,7 @@ Orders:
break Orders
}
}
case "http_custom":
case "http_user_provided":
if syncMode.Http {
t.l.Info().Msg("using HTTP custom URLs")
now = t.queryAllHttpTime(t.networkConfig.TimeSyncHTTPUrls)

8
network.go
View File

@ -19,6 +19,14 @@ func networkStateChanged() {
// do not block the main thread
go waitCtrlAndRequestDisplayUpdate(true)
if timeSync != nil {
if networkState != nil {
timeSync.SetDhcpNtpAddresses(networkState.NtpAddressesString())
}
timeSync.Sync()
}
// always restart mDNS when the network state changes
if mDNS != nil {
_ = mDNS.SetListenOptions(config.NetworkConfig.GetMDNSMode())