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https://github.com/0rangebananaspy/authelia.git
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This adds method to validate the system clock is synchronized on startup. Configuration allows adjusting the server address, enabled state, desync limit, and if the error is fatal. Co-authored-by: James Elliott <james-d-elliott@users.noreply.github.com>
43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
package ntp
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import "time"
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// ntpLeapVersionClientMode does the mathematics to configure the leap/version/mode value of an NTP client packet.
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func ntpLeapVersionClientMode(leap bool, version ntpVersion) (lvm uint8) {
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lvm = ntpClientModeValue
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if leap {
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lvm += ntpLeapEnabledValue
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}
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switch version {
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case ntpV3:
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lvm += ntpVersion3Value
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case ntpV4:
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lvm += ntpVersion4Value
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}
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return lvm
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}
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// ntpPacketToTime converts a NTP server response into a time.Time.
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func ntpPacketToTime(packet *ntpPacket) time.Time {
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seconds := float64(packet.TxTimeSeconds) - ntpEpochOffset
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nanoseconds := (int64(packet.TxTimeFraction) * 1e9) >> 32
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return time.Unix(int64(seconds), nanoseconds)
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}
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// ntpIsOffsetTooLarge return true if there is offset of "offset" between two times.
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func ntpIsOffsetTooLarge(maxOffset time.Duration, first, second time.Time) (tooLarge bool) {
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var offset time.Duration
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if first.After(second) {
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offset = first.Sub(second)
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} else {
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offset = second.Sub(first)
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}
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return offset > maxOffset
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}
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