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telegraf/plugins/inputs/chrony/chrony_test.go

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package chrony
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"net"
"testing"
"time"
fbchrony "github.com/facebook/time/ntp/chrony"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"github.com/stretchr/testify/require"
"github.com/testcontainers/testcontainers-go/wait"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
"github.com/influxdata/telegraf/testutil"
)
func TestGatherActivity(t *testing.T) {
// Setup a mock server
server := Server{
ActivityInfo: &fbchrony.Activity{
Online: 34,
Offline: 6,
BurstOnline: 2,
BurstOffline: 0,
Unresolved: 5,
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"activity"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_activity",
map[string]string{"source": addr},
map[string]interface{}{
"online": 34,
"offline": 6,
"burst_online": 2,
"burst_offline": 0,
"unresolved": 5,
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherTracking(t *testing.T) {
// Setup a mock server
server := Server{
TrackingInfo: &fbchrony.Tracking{
RefID: 0xA29FC87B,
IPAddr: net.ParseIP("192.168.1.22"),
Stratum: 3,
LeapStatus: 3,
RefTime: time.Now(),
CurrentCorrection: 0.000020390,
LastOffset: 0.000012651,
RMSOffset: 0.000025577,
FreqPPM: -16.001,
ResidFreqPPM: 0.0,
SkewPPM: 0.006,
RootDelay: 0.001655,
RootDispersion: 0.003307,
LastUpdateInterval: 507.2,
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"tracking"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony",
map[string]string{
"source": addr,
"reference_id": "A29FC87B",
"leap_status": "not synchronized",
"stratum": "3",
},
map[string]interface{}{
"system_time": 0.000020390,
"last_offset": 0.000012651,
"rms_offset": 0.000025577,
"frequency": -16.001,
"residual_freq": 0.0,
"skew": 0.006,
"root_delay": 0.001655,
"root_dispersion": 0.003307,
"update_interval": 507.2,
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherServerStats(t *testing.T) {
// Setup a mock server
server := Server{
ServerStatInfo: &fbchrony.ServerStats{
NTPHits: 2542,
CMDHits: 112,
NTPDrops: 42,
CMDDrops: 8,
LogDrops: 0,
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"serverstats"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_serverstats",
map[string]string{"source": addr},
map[string]interface{}{
"ntp_hits": uint64(2542),
"ntp_drops": uint64(42),
"cmd_hits": uint64(112),
"cmd_drops": uint64(8),
"log_drops": uint64(0),
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherServerStats2(t *testing.T) {
// Setup a mock server
server := Server{
ServerStatInfo: &fbchrony.ServerStats2{
NTPHits: 2542,
NKEHits: 5,
CMDHits: 112,
NTPDrops: 42,
NKEDrops: 1,
CMDDrops: 8,
LogDrops: 0,
NTPAuthHits: 9,
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"serverstats"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_serverstats",
map[string]string{"source": addr},
map[string]interface{}{
"ntp_hits": uint64(2542),
"ntp_drops": uint64(42),
"ntp_auth_hits": uint64(9),
"cmd_hits": uint64(112),
"cmd_drops": uint64(8),
"log_drops": uint64(0),
"nke_hits": uint64(5),
"nke_drops": uint64(1),
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherServerStats3(t *testing.T) {
// Setup a mock server
server := Server{
ServerStatInfo: &fbchrony.ServerStats3{
NTPHits: 2542,
NKEHits: 5,
CMDHits: 112,
NTPDrops: 42,
NKEDrops: 1,
CMDDrops: 8,
LogDrops: 0,
NTPAuthHits: 9,
NTPInterleavedHits: 28,
NTPTimestamps: 69527,
NTPSpanSeconds: 33,
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"serverstats"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_serverstats",
map[string]string{"source": addr},
map[string]interface{}{
"ntp_hits": uint64(2542),
"ntp_drops": uint64(42),
"ntp_auth_hits": uint64(9),
"ntp_interleaved_hits": uint64(28),
"ntp_timestamps": uint64(69527),
"ntp_span_seconds": uint64(33),
"cmd_hits": uint64(112),
"cmd_drops": uint64(8),
"log_drops": uint64(0),
"nke_hits": uint64(5),
"nke_drops": uint64(1),
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherSources(t *testing.T) {
// Setup a mock server
server := Server{
SourcesInfo: []source{
{
name: "ntp1.my.org",
data: &fbchrony.SourceData{
IPAddr: net.IPv4(192, 168, 0, 1),
Poll: 64,
Stratum: 16,
State: fbchrony.SourceStateSync,
Mode: fbchrony.SourceModePeer,
Flags: 0,
Reachability: 0,
SinceSample: 0,
OrigLatestMeas: 1.22354,
LatestMeas: 1.22354,
LatestMeasErr: 0.00423,
},
},
{
name: "ntp2.my.org",
data: &fbchrony.SourceData{
IPAddr: net.IPv4(192, 168, 0, 2),
Poll: 64,
Stratum: 16,
State: fbchrony.SourceStateSync,
Mode: fbchrony.SourceModePeer,
Flags: 0,
Reachability: 0,
SinceSample: 0,
OrigLatestMeas: 0.17791,
LatestMeas: 0.35445,
LatestMeasErr: 0.01196,
},
},
{
name: "ntp3.my.org",
data: &fbchrony.SourceData{
IPAddr: net.IPv4(192, 168, 0, 3),
Poll: 512,
Stratum: 1,
State: fbchrony.SourceStateOutlier,
Mode: fbchrony.SourceModePeer,
Flags: 0,
Reachability: 512,
SinceSample: 377,
OrigLatestMeas: 7.21158,
LatestMeas: 7.21158,
LatestMeasErr: 2.15453,
},
},
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"sources"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_sources",
map[string]string{
"source": addr,
"peer": "ntp1.my.org",
},
map[string]interface{}{
"index": 0,
"ip": "192.168.0.1",
"poll": 64,
"stratum": uint64(16),
"state": "sync",
"mode": "peer",
"flags": uint64(0),
"reachability": uint64(0),
"sample": uint64(0),
"latest_measurement": 1.22354,
"latest_measurement_error": 0.00423,
},
time.Unix(0, 0),
),
metric.New(
"chrony_sources",
map[string]string{
"source": addr,
"peer": "ntp2.my.org",
},
map[string]interface{}{
"index": 1,
"ip": "192.168.0.2",
"poll": 64,
"stratum": uint64(16),
"state": "sync",
"mode": "peer",
"flags": uint64(0),
"reachability": uint64(0),
"sample": uint64(0),
"latest_measurement": 0.35445,
"latest_measurement_error": 0.01196,
},
time.Unix(0, 0),
),
metric.New(
"chrony_sources",
map[string]string{
"source": addr,
"peer": "ntp3.my.org",
},
map[string]interface{}{
"index": 2,
"ip": "192.168.0.3",
"poll": 512,
"stratum": uint64(1),
"state": "outlier",
"mode": "peer",
"flags": uint64(0),
"reachability": uint64(512),
"sample": uint64(377),
"latest_measurement": 7.21158,
"latest_measurement_error": 2.15453,
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestGatherSourceStats(t *testing.T) {
// Setup a mock server
server := Server{
SourcesInfo: []source{
{
name: "ntp1.my.org",
stats: &fbchrony.SourceStats{
RefID: 434354566,
IPAddr: net.IPv4(192, 168, 0, 1),
NSamples: 1254,
NRuns: 16,
SpanSeconds: 32,
StandardDeviation: 0.0244,
ResidFreqPPM: 0.0015,
SkewPPM: 0.0001,
EstimatedOffset: 0.0039,
EstimatedOffsetErr: 0.0007,
},
},
{
name: "ntp2.my.org",
stats: &fbchrony.SourceStats{
RefID: 70349595,
IPAddr: net.IPv4(192, 168, 0, 2),
NSamples: 23135,
NRuns: 24,
SpanSeconds: 3,
StandardDeviation: 0.0099,
ResidFreqPPM: 0.0188,
SkewPPM: 0.0002,
EstimatedOffset: 0.0104,
EstimatedOffsetErr: 0.0021,
},
},
{
name: "ntp3.my.org",
stats: &fbchrony.SourceStats{
RefID: 983490438,
IPAddr: net.IPv4(192, 168, 0, 3),
NSamples: 23,
NRuns: 4,
SpanSeconds: 193,
StandardDeviation: 7.0586,
ResidFreqPPM: 0.8320,
SkewPPM: 0.0332,
EstimatedOffset: 5.3345,
EstimatedOffsetErr: 1.5437,
},
},
},
}
addr, err := server.Listen(t)
require.NoError(t, err)
defer server.Shutdown()
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Metrics: []string{"sourcestats"},
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Start the plugin, do a gather and stop everything
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
plugin.Stop()
server.Shutdown()
// Do the comparison
expected := []telegraf.Metric{
metric.New(
"chrony_sourcestats",
map[string]string{
"source": addr,
"peer": "ntp1.my.org",
"reference_id": "19E3B986",
},
map[string]interface{}{
"index": 0,
"ip": "192.168.0.1",
"samples": uint64(1254),
"runs": uint64(16),
"span_seconds": uint64(32),
"stddev": 0.0244,
"residual_frequency": 0.0015,
"skew": 0.0001,
"offset": 0.0039,
"offset_error": 0.0007,
},
time.Unix(0, 0),
),
metric.New(
"chrony_sourcestats",
map[string]string{
"source": addr,
"peer": "ntp2.my.org",
"reference_id": "0431731B",
},
map[string]interface{}{
"index": 1,
"ip": "192.168.0.2",
"samples": uint64(23135),
"runs": uint64(24),
"span_seconds": uint64(3),
"stddev": 0.0099,
"residual_frequency": 0.0188,
"skew": 0.0002,
"offset": 0.0104,
"offset_error": 0.0021,
},
time.Unix(0, 0),
),
metric.New(
"chrony_sourcestats",
map[string]string{
"source": addr,
"peer": "ntp3.my.org",
"reference_id": "3A9EDF86",
},
map[string]interface{}{
"index": 2,
"ip": "192.168.0.3",
"samples": uint64(23),
"runs": uint64(4),
"span_seconds": uint64(193),
"stddev": 7.0586,
"residual_frequency": 0.8320,
"skew": 0.0332,
"offset": 5.3345,
"offset_error": 1.5437,
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
// tests on linux with go1.20 will add a warning about code coverage, ignore that tag
testutil.IgnoreTags("warning"),
testutil.IgnoreTime(),
cmpopts.EquateApprox(0.001, 0),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsEqual(t, expected, actual, options...)
}
func TestIntegration(t *testing.T) {
if testing.Short() {
t.Skip("Skipping integration test in short mode")
}
// Start the docker container
container := testutil.Container{
Image: "dockurr/chrony",
ExposedPorts: []string{"323/udp"},
Files: map[string]string{
"/etc/telegraf-chrony.conf": "testdata/chrony.conf",
"/start.sh": "testdata/start.sh",
},
Entrypoint: []string{"/start.sh"},
WaitingFor: wait.ForLog("Selected source"),
}
require.NoError(t, container.Start(), "failed to start container")
defer container.Terminate()
addr := container.Address + ":" + container.Ports["323"]
// Setup the plugin
plugin := &Chrony{
Server: "udp://" + addr,
Log: testutil.Logger{},
}
require.NoError(t, plugin.Init())
// Collect the metrics and compare
var acc testutil.Accumulator
require.NoError(t, plugin.Start(&acc))
defer plugin.Stop()
require.NoError(t, plugin.Gather(&acc))
// Setup the expectations
expected := []telegraf.Metric{
metric.New(
"chrony",
map[string]string{
"source": addr,
"leap_status": "normal",
"reference_id": "A29FC87B",
"stratum": "4",
},
map[string]interface{}{
"frequency": float64(0),
"last_offset": float64(0),
"residual_freq": float64(0),
"rms_offset": float64(0),
"root_delay": float64(0),
"root_dispersion": float64(0),
"skew": float64(0),
"system_time": float64(0),
"update_interval": float64(0),
},
time.Unix(0, 0),
),
}
options := []cmp.Option{
testutil.IgnoreTags("leap_status", "reference_id", "stratum"),
testutil.IgnoreTime(),
}
actual := acc.GetTelegrafMetrics()
testutil.RequireMetricsStructureEqual(t, expected, actual, options...)
}
type source struct {
name string
data *fbchrony.SourceData
stats *fbchrony.SourceStats
}
type Server struct {
ActivityInfo *fbchrony.Activity
TrackingInfo *fbchrony.Tracking
ServerStatInfo interface{}
SourcesInfo []source
conn net.PacketConn
}
func (s *Server) Shutdown() {
if s.conn != nil {
s.conn.Close()
}
}
func (s *Server) Listen(t *testing.T) (string, error) {
conn, err := net.ListenPacket("udp", "127.0.0.1:0")
if err != nil {
return "", err
}
s.conn = conn
addr := s.conn.LocalAddr().String()
go s.serve(t)
return addr, nil
}
func (s *Server) serve(t *testing.T) {
defer s.conn.Close()
for {
buf := make([]byte, 4096)
n, addr, err := s.conn.ReadFrom(buf)
if err != nil {
return
}
t.Logf("mock server: received %d bytes from %q\n", n, addr.String())
var header fbchrony.RequestHead
data := bytes.NewBuffer(buf)
if err := binary.Read(data, binary.BigEndian, &header); err != nil {
t.Errorf("mock server: reading request header failed: %v", err)
return
}
seqno := header.Sequence + 1
t.Logf("mock server: received request %d", header.Command)
switch header.Command {
case 14: // sources
_, err := s.conn.WriteTo(s.encodeSourcesReply(seqno), addr)
if err != nil {
t.Errorf("mock server [sources]: writing reply failed: %v", err)
} else {
t.Log("mock server [sources]: successfully wrote reply")
}
case 15: // source data
var idx int32
if err = binary.Read(data, binary.BigEndian, &idx); err != nil {
t.Error(err)
return
}
_, err = s.conn.WriteTo(s.encodeSourceDataReply(seqno, idx), addr)
if err != nil {
t.Errorf("mock server [source data]: writing reply failed: %v", err)
} else {
t.Log("mock server [source data]: successfully wrote reply")
}
case 33: // tracking
_, err := s.conn.WriteTo(s.encodeTrackingReply(seqno), addr)
if err != nil {
t.Errorf("mock server [tracking]: writing reply failed: %v", err)
} else {
t.Log("mock server [tracking]: successfully wrote reply")
}
case 34: // source stats
var idx int32
if err = binary.Read(data, binary.BigEndian, &idx); err != nil {
t.Error(err)
return
}
_, err = s.conn.WriteTo(s.encodeSourceStatsReply(seqno, idx), addr)
if err != nil {
t.Errorf("mock server [source stats]: writing reply failed: %v", err)
} else {
t.Log("mock server [source stats]: successfully wrote reply")
}
case 44: // activity
payload, err := s.encodeActivityReply(seqno)
if err != nil {
t.Error(err)
return
}
_, err = s.conn.WriteTo(payload, addr)
if err != nil {
t.Errorf("mock server [activity]: writing reply failed: %v", err)
} else {
t.Log("mock server [activity]: successfully wrote reply")
}
case 54: // server stats
payload, err := s.encodeServerStatsReply(seqno)
if err != nil {
t.Error(err)
return
}
_, err = s.conn.WriteTo(payload, addr)
if err != nil {
t.Errorf("mock server [serverstats]: writing reply failed: %v", err)
} else {
t.Log("mock server [serverstats]: successfully wrote reply")
}
case 65: // source name
buf := make([]byte, 20)
_, err := data.Read(buf)
if err != nil {
t.Error(err)
return
}
ip := decodeIP(buf)
t.Logf("mock server [source name]: resolving %v", ip)
_, err = s.conn.WriteTo(s.encodeSourceNameReply(seqno, ip), addr)
if err != nil {
t.Errorf("mock server [source name]: writing reply failed: %v", err)
} else {
t.Log("mock server [source name]: successfully wrote reply")
}
default:
t.Logf("mock server: unhandled command %v", header.Command)
}
}
}
func (s *Server) encodeActivityReply(sequence uint32) ([]byte, error) {
// Encode the header
buf := encodeHeader(44, 12, 0, sequence) // activity request
// Encode data
b := bytes.NewBuffer(buf)
if err := binary.Write(b, binary.BigEndian, s.ActivityInfo); err != nil {
return nil, err
}
return b.Bytes(), nil
}
func (s *Server) encodeTrackingReply(sequence uint32) []byte {
t := s.TrackingInfo
// Encode the header
buf := encodeHeader(33, 5, 0, sequence) // tracking request
// Encode data
buf = binary.BigEndian.AppendUint32(buf, t.RefID)
buf = append(buf, encodeIP(t.IPAddr)...)
buf = binary.BigEndian.AppendUint16(buf, t.Stratum)
buf = binary.BigEndian.AppendUint16(buf, t.LeapStatus)
sec := uint64(t.RefTime.Unix())
nsec := uint32(t.RefTime.UnixNano() % t.RefTime.Unix() * int64(time.Second))
buf = binary.BigEndian.AppendUint32(buf, uint32(sec>>32)) // seconds high part
buf = binary.BigEndian.AppendUint32(buf, uint32(sec&0xffffffff)) // seconds low part
buf = binary.BigEndian.AppendUint32(buf, nsec) // nanoseconds
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.CurrentCorrection))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.LastOffset))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.RMSOffset))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.FreqPPM))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.ResidFreqPPM))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.SkewPPM))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.RootDelay))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.RootDispersion))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(t.LastUpdateInterval))
return buf
}
func (s *Server) encodeServerStatsReply(sequence uint32) ([]byte, error) {
var b *bytes.Buffer
var err error
switch info := s.ServerStatInfo.(type) {
case *fbchrony.ServerStats:
// Encode the header
buf := encodeHeader(54, 14, 0, sequence) // activity request
// Encode data
b = bytes.NewBuffer(buf)
err = binary.Write(b, binary.BigEndian, info)
case *fbchrony.ServerStats2:
// Encode the header
buf := encodeHeader(54, 22, 0, sequence) // activity request
// Encode data
b = bytes.NewBuffer(buf)
err = binary.Write(b, binary.BigEndian, info)
case *fbchrony.ServerStats3:
// Encode the header
buf := encodeHeader(54, 24, 0, sequence) // activity request
// Encode data
b = bytes.NewBuffer(buf)
err = binary.Write(b, binary.BigEndian, info)
}
if err != nil {
return nil, err
}
return b.Bytes(), nil
}
func (s *Server) encodeSourcesReply(sequence uint32) []byte {
// Encode the header
buf := encodeHeader(14, 2, 0, sequence) // sources request
// Encode data
buf = binary.BigEndian.AppendUint32(buf, uint32(len(s.SourcesInfo))) // NSources
return buf
}
func (s *Server) encodeSourceDataReply(sequence uint32, idx int32) []byte {
if len(s.SourcesInfo) <= int(idx) {
return encodeHeader(15, 3, 3, sequence) // status invalid
}
src := s.SourcesInfo[idx].data
// Encode the header
buf := encodeHeader(15, 3, 0, sequence) // source data request
// Encode data
buf = append(buf, encodeIP(src.IPAddr)...)
buf = binary.BigEndian.AppendUint16(buf, uint16(src.Poll))
buf = binary.BigEndian.AppendUint16(buf, src.Stratum)
buf = binary.BigEndian.AppendUint16(buf, uint16(src.State))
buf = binary.BigEndian.AppendUint16(buf, uint16(src.Mode))
buf = binary.BigEndian.AppendUint16(buf, src.Flags)
buf = binary.BigEndian.AppendUint16(buf, src.Reachability)
buf = binary.BigEndian.AppendUint32(buf, src.SinceSample)
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.OrigLatestMeas))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.LatestMeas))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.LatestMeasErr))
return buf
}
func (s *Server) encodeSourceStatsReply(sequence uint32, idx int32) []byte {
if len(s.SourcesInfo) <= int(idx) {
return encodeHeader(34, 6, 3, sequence) // status invalid
}
src := s.SourcesInfo[idx].stats
// Encode the header
buf := encodeHeader(15, 6, 0, sequence) // source data request
// Encode data
buf = binary.BigEndian.AppendUint32(buf, src.RefID)
buf = append(buf, encodeIP(src.IPAddr)...)
buf = binary.BigEndian.AppendUint32(buf, src.NSamples)
buf = binary.BigEndian.AppendUint32(buf, src.NRuns)
buf = binary.BigEndian.AppendUint32(buf, src.SpanSeconds)
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.StandardDeviation))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.ResidFreqPPM))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.SkewPPM))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.EstimatedOffset))
buf = binary.BigEndian.AppendUint32(buf, encodeFloat(src.EstimatedOffsetErr))
return buf
}
func (s *Server) encodeSourceNameReply(sequence uint32, ip net.IP) []byte {
// Encode the header
buf := encodeHeader(65, 19, 0, sequence) // source name request
// Find the correct source
var name []byte
for _, src := range s.SourcesInfo {
if src.data != nil && src.data.IPAddr.Equal(ip) || src.stats != nil && src.stats.IPAddr.Equal(ip) {
name = []byte(src.name)
break
}
}
// Encode data
if len(name) > 256 {
buf = append(buf, name[:256]...)
} else {
buf = append(buf, name...)
buf = append(buf, make([]byte, 256-len(name))...)
}
return buf
}
func encodeHeader(command, replyType, status uint16, seqnr uint32) []byte {
buf := []byte{
0x06, // version 6
0x02, // packet type 2: reply
0x00, // res1
0x00, // res2
}
buf = binary.BigEndian.AppendUint16(buf, command) // command
buf = binary.BigEndian.AppendUint16(buf, replyType) // reply type
buf = binary.BigEndian.AppendUint16(buf, status) // status 0: success
buf = append(buf, []byte{
0x00, 0x00, // pad1
0x00, 0x00, // pad2
0x00, 0x00, // pad3
}...)
buf = binary.BigEndian.AppendUint32(buf, seqnr) // sequence number
buf = append(buf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00) // pad 4 & 5
return buf
}
func encodeIP(addr net.IP) []byte {
var buf []byte
buf = append(buf, addr.To16()...)
if len(addr) == 4 {
buf = append(buf, 0x00, 0x01) // IPv4 address family
} else {
buf = append(buf, 0x00, 0x02) // IPv6 address family
}
buf = append(buf, 0x00, 0x00) // padding
return buf
}
func decodeIP(buf []byte) net.IP {
if len(buf) != 20 {
panic("invalid length for IP")
}
addr := net.IP(buf[0:16])
family := binary.BigEndian.Uint16(buf[16:18])
if family == 1 {
return addr.To4()
}
return addr
}
// Modified based on https://github.com/mlichvar/chrony/blob/master/util.c
const (
floatExpBits = int32(7)
floatCoeffBits = int32(25) // 32 - floatExpBits
floatExpMin = int32(-(1 << (floatExpBits - 1)))
floatExpMax = -floatExpMin - 1
floatCoefMin = int32(-(1 << (floatCoeffBits - 1)))
floatCoefMax = -floatCoefMin - 1
)
func encodeFloat(x float64) uint32 {
var neg int32
if math.IsNaN(x) {
/* Save NaN as zero */
x = 0.0
} else if x < 0.0 {
x = -x
neg = 1
}
var exp, coef int32
if x > 1.0e100 {
exp = floatExpMax
coef = floatCoefMax + neg
} else if x > 1.0e-100 {
exp = int32(math.Log2(x)) + 1
coef = int32(x*math.Pow(2.0, float64(-exp+floatCoeffBits)) + 0.5)
if coef <= 0 {
panic(fmt.Errorf("invalid coefficient %v for value %f", coef, x))
}
/* we may need to shift up to two bits down */
for coef > floatCoefMax+neg {
coef >>= 1
exp++
}
if exp > floatExpMax {
/* overflow */
exp = floatExpMax
coef = floatCoefMax + neg
} else if exp < floatExpMin {
/* underflow */
if exp+floatCoeffBits >= floatExpMin {
coef >>= floatExpMin - exp
exp = floatExpMin
} else {
exp = 0
coef = 0
}
}
}
/* negate back */
if neg != 0 {
coef = int32(uint32(-coef) % (1 << floatCoeffBits))
}
return uint32(exp<<floatCoeffBits) | uint32(coef)
}