120 lines
4.0 KiB
Go
120 lines
4.0 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
// Contains the NTP time drift detection via the SNTP protocol:
|
|
// https://tools.ietf.org/html/rfc4330
|
|
|
|
package discover
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"sort"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/log"
|
|
)
|
|
|
|
const (
|
|
ntpPool = "pool.ntp.org" // ntpPool is the NTP server to query for the current time
|
|
ntpChecks = 3 // Number of measurements to do against the NTP server
|
|
)
|
|
|
|
// durationSlice attaches the methods of sort.Interface to []time.Duration,
|
|
// sorting in increasing order.
|
|
type durationSlice []time.Duration
|
|
|
|
func (s durationSlice) Len() int { return len(s) }
|
|
func (s durationSlice) Less(i, j int) bool { return s[i] < s[j] }
|
|
func (s durationSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
|
|
// checkClockDrift queries an NTP server for clock drifts and warns the user if
|
|
// one large enough is detected.
|
|
func checkClockDrift() {
|
|
drift, err := sntpDrift(ntpChecks)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if drift < -driftThreshold || drift > driftThreshold {
|
|
log.Warn(fmt.Sprintf("System clock seems off by %v, which can prevent network connectivity", drift))
|
|
log.Warn("Please enable network time synchronisation in system settings.")
|
|
} else {
|
|
log.Debug("NTP sanity check done", "drift", drift)
|
|
}
|
|
}
|
|
|
|
// sntpDrift does a naive time resolution against an NTP server and returns the
|
|
// measured drift. This method uses the simple version of NTP. It's not precise
|
|
// but should be fine for these purposes.
|
|
//
|
|
// Note, it executes two extra measurements compared to the number of requested
|
|
// ones to be able to discard the two extremes as outliers.
|
|
func sntpDrift(measurements int) (time.Duration, error) {
|
|
// Resolve the address of the NTP server
|
|
addr, err := net.ResolveUDPAddr("udp", ntpPool+":123")
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
// Construct the time request (empty package with only 2 fields set):
|
|
// Bits 3-5: Protocol version, 3
|
|
// Bits 6-8: Mode of operation, client, 3
|
|
request := make([]byte, 48)
|
|
request[0] = 3<<3 | 3
|
|
|
|
// Execute each of the measurements
|
|
drifts := []time.Duration{}
|
|
for i := 0; i < measurements+2; i++ {
|
|
// Dial the NTP server and send the time retrieval request
|
|
conn, err := net.DialUDP("udp", nil, addr)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer conn.Close()
|
|
|
|
sent := time.Now()
|
|
if _, err = conn.Write(request); err != nil {
|
|
return 0, err
|
|
}
|
|
// Retrieve the reply and calculate the elapsed time
|
|
conn.SetDeadline(time.Now().Add(5 * time.Second))
|
|
|
|
reply := make([]byte, 48)
|
|
if _, err = conn.Read(reply); err != nil {
|
|
return 0, err
|
|
}
|
|
elapsed := time.Since(sent)
|
|
|
|
// Reconstruct the time from the reply data
|
|
sec := uint64(reply[43]) | uint64(reply[42])<<8 | uint64(reply[41])<<16 | uint64(reply[40])<<24
|
|
frac := uint64(reply[47]) | uint64(reply[46])<<8 | uint64(reply[45])<<16 | uint64(reply[44])<<24
|
|
|
|
nanosec := sec*1e9 + (frac*1e9)>>32
|
|
|
|
t := time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC).Add(time.Duration(nanosec)).Local()
|
|
|
|
// Calculate the drift based on an assumed answer time of RRT/2
|
|
drifts = append(drifts, sent.Sub(t)+elapsed/2)
|
|
}
|
|
// Calculate average drift (drop two extremities to avoid outliers)
|
|
sort.Sort(durationSlice(drifts))
|
|
|
|
drift := time.Duration(0)
|
|
for i := 1; i < len(drifts)-1; i++ {
|
|
drift += drifts[i]
|
|
}
|
|
return drift / time.Duration(measurements), nil
|
|
}
|