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A Network Time Protocol client in Go
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gotamer/ntpc
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This is an implementation of a simple NTP client in Go. It uses theencoding/binary package to encode and decode NTP packets sent to and received from a remote NTP server over UDP.
It also does:
- log via linux syslog
- local date update
I use it to periodically update my Linux laptop system time.On my system it runs once an hour via a cron job.
It works well, and is stable. I been running it for years.
// NTP packet format (v3 with optional v4 fields removed)//// 0 1 2 3// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// |LI | VN |Mode | Stratum | Poll | Precision |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | Root Delay |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | Root Dispersion |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | Reference ID |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | |// + Reference Timestamp (64) +// | |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | |// + Origin Timestamp (64) +// | |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | |// + Receive Timestamp (64) +// | |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+// | |// + Transmit Timestamp (64) +// | |// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+This is a fork of Vladimir Vivien's go-ntp-client. (Thank you Vladimir)
The original code is explained by Vladimir Vivien in this writeup titledLet's make an NTP client in Go
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